CA1141711A - Load lifting unit for lift truck - Google Patents
Load lifting unit for lift truckInfo
- Publication number
- CA1141711A CA1141711A CA000347748A CA347748A CA1141711A CA 1141711 A CA1141711 A CA 1141711A CA 000347748 A CA000347748 A CA 000347748A CA 347748 A CA347748 A CA 347748A CA 1141711 A CA1141711 A CA 1141711A
- Authority
- CA
- Canada
- Prior art keywords
- lift
- lift truck
- truck
- lifting unit
- load
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/08—Masts; Guides; Chains
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/12—Platforms; Forks; Other load supporting or gripping members
- B66F9/122—Platforms; Forks; Other load supporting or gripping members longitudinally movable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/12—Platforms; Forks; Other load supporting or gripping members
- B66F9/14—Platforms; Forks; Other load supporting or gripping members laterally movable, e.g. swingable, for slewing or transverse movements
- B66F9/147—Whole unit including fork support moves relative to mast
- B66F9/148—Whole unit including fork support moves sideways
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/12—Platforms; Forks; Other load supporting or gripping members
- B66F9/16—Platforms; Forks; Other load supporting or gripping members inclinable relative to mast
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/12—Platforms; Forks; Other load supporting or gripping members
- B66F9/18—Load gripping or retaining means
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
LOAD LIFTING UNIT FOR LIFT TRUCK
ABSTRACT
The present invention discloses a load lifting unit for a lift truck, and more particularly, an improved structure of a load lifting unit for a counterbalance type lift truck. In the invention, to increase the loading capacity and longitudinal stability of the lift truck as well as to improve the forward visibility from the lift truck, two lift cylinders (7) are separately disposed on the sides of a pair of upright assemblies (1) of the load lifting unit, respectively, to obtain a space (17) between the upright assemblies for allowing a lift member (4) to be lifted and lowered within the space and for allowing actuating means of various operation attachments engaged with the lift member to be accommodatedly arranged within the space.
ABSTRACT
The present invention discloses a load lifting unit for a lift truck, and more particularly, an improved structure of a load lifting unit for a counterbalance type lift truck. In the invention, to increase the loading capacity and longitudinal stability of the lift truck as well as to improve the forward visibility from the lift truck, two lift cylinders (7) are separately disposed on the sides of a pair of upright assemblies (1) of the load lifting unit, respectively, to obtain a space (17) between the upright assemblies for allowing a lift member (4) to be lifted and lowered within the space and for allowing actuating means of various operation attachments engaged with the lift member to be accommodatedly arranged within the space.
Description
~4~t~1~
LOAD LIFTING UNIT FOR LIFT TRUCK
FIELD OF THE INVENTION
The present invention relates to a load lifting unit for a lift truck, and more particularly to a load lifting unit for a counterbalance type lift truck in which firstly, the forward visibility from the drive's seat of the lift truck is improved and secondly, the load center is located as close as possible to the body of the lift truck for the purpose of enhancing the stability of the lift truck as well as increasing the permissible load when various kinds of operating attachments are mounted on the load lifting unit.
~ACKGROUND OF THE INVENTION
Generally, in a load lifting unit of a lift truck, especially, of a counterbalance type lift truck, a lift cyclinder for lifting and lowering a lift member including cross plate members and side plate members and lift chains are arranged at a central portion between left and right uprights. Thus, the lift cylinder is positioned in front of the driver's seat, so that a wide region of the driver's forward visibility is obstructed. Therefore, it is difficult to clearly see signs or obstructions or to watch the front end portion of a fork. This load lifting unit has various problems concerning safety and operation efficiency. In addition, since the lift cylinder is disposed at such a central portion between the uprights, an attachment such as a side shift fork, a fork with a winch, or a rotating i ~ ~
11~17~1 clamp, must be mounted in such a way that the base portion of the attachment is fixed to the lift member so as not to interfere with the lift cyclinder. To meet this require-ment, the attachment is generally mounted on the cross plate member or members located at the forward position of the uprights. Therefore, the distance between the load center position of the attachment and the center of the front wheels is long. Moreover, since the attachment has its own ac'cuating mechanism, the load center position is further moved forwardly away from the center of the front wheels of the truck. As a result, the permissible load as well as the fore-and-aft stability of the lift truck are reduced so that a load lifting operation attainable by using a conventional fork cannot be effected, and it is possible to obtain only the loading capacity of a less powerful lift truck, when the above-mentioned attachment is attached to the truck in place of the conventional fork.
To overcome a significant reduction in the loading capacity it has been proposed to reduce the thickness of the attachment, especially, of the actuating mechanism thereof for recovering the lost loading capacity. In the case of, for example, the rotating clamp or the rotating fork, it has been proposed to reduce the thickness of the rotator gear of the rotator while increasing the diameter thereof. ~Iowever, if the thickness of the components of the attachment is reduced, the size of the components in a vertical plane must be increased to obtain the desired mechanical strength of the components. Therefore, the L'7~1 height of the attachmen-t and the projected area of the attachment in the vertical plane are increased, and accord-ingly, the forward visibility is further obstructed and the visible range for the forward operation from the driver's seat is greatly narrowed. In this connection, a counter-measure for improving the forward visibility from the driver's seat of the lift truck has first been proposed. A
specific example of the proposal has been disclosed in 3apanese Patent Publication No. Sho 49-29661. However, there has not yet been proposed a countermeasure which can attain both an improvement in the forward visibiiity and an increase in the permissible load while further attaining positive promotion of safety.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an improved structure of a load lifting unit which is capable of improving the forward visibility from the driver's seat of a lift truck and yet capable of attaining an increase in the permissible load and an im-provement in the fore-and-aft stability of a counterbalance type lift truck.
To achieve this object, the present invention pro-poses, first, to separately dispose lift cylinders, compo-nents of a load lifting unit, on the sides of left and right uprights to form and secure a space between these uprights in order to widen the range of the forward visibi-lity, and further adopts the following arrangement. More specifically, based on the fact that the permissible load can be increased as the distance between the center of the front wheels of the lift truck and the load center is reduced, it was first decided to adopt a novel arrange-- ment for retracting from a position in front of the up-rights, a cross plate member which is one of the membershaving a relationship to the above-mentioned reduction of distance and is considered to be an indispensable consti-tuent of lift member. Then, it was further decided to accommodate an actuating means for an attachment having a large service weight within the space created by such rear-rangement. The actuating means, the lift member, etc. are thus rearranged to successfully reduce the aforesaid distance. Thus, the movement of the load center towards the truck body of the lift truck having the attachment mounted thereon was successfully accomplished. ~s a result, not only can the forward ~isibility, especially, the visibility for the forward operation from the driver's seat of the lift truck be improved but also the distance from the center of the front wheels of the lift truck to the load center can be reduced~ so that the permissible load counterbalanced with the body weight of the lift truck can ~e increased and stability in the longitudinal direction of the lift truck can be promoted. The inven-tion will be described in detail below, referring to embodiments illustrated in the accompanying drawings.
In the embodiments illustrated in the drawings, the same or like, elements for attaining the same operation are denoted by the same reference numerals.
11~17~1 DESCRIPTION OF THE DRAWINGS
Fig. 1 is a side elevational view of a first embodi-ment according to the present invention;
Fig. 2 is a schematic side view of an essential part of the same embodiment;
Fig. 3 is a perspective rear view of a main part of the same embodiment;
Fig. 4 is a partially sectional plan view of the same essential part as Fig. 3;
Fig. 5 is a diagrammatical explanatory view illustrat-ing a region in which the forward visibility is obstructed;
Fig. 6 is a side elevational view of a lift truck equipped with a load lifting unit in accordance with another embodiment of the present invention;
Fig. 7 is a rear view of an essential part of the same embodiment;
Fig. 8 is a partially sectional plan view of the essential part of the same embodiment;
Fig. 9 is a perspective view of the essential part of the same embodiment;
Fig. 10 is a side elevational view of a lift truck equipped with a load lifting unit in accordance with still another embodiment of the present invention;
Fig. 11 is a rear elevational view of an essential
LOAD LIFTING UNIT FOR LIFT TRUCK
FIELD OF THE INVENTION
The present invention relates to a load lifting unit for a lift truck, and more particularly to a load lifting unit for a counterbalance type lift truck in which firstly, the forward visibility from the drive's seat of the lift truck is improved and secondly, the load center is located as close as possible to the body of the lift truck for the purpose of enhancing the stability of the lift truck as well as increasing the permissible load when various kinds of operating attachments are mounted on the load lifting unit.
~ACKGROUND OF THE INVENTION
Generally, in a load lifting unit of a lift truck, especially, of a counterbalance type lift truck, a lift cyclinder for lifting and lowering a lift member including cross plate members and side plate members and lift chains are arranged at a central portion between left and right uprights. Thus, the lift cylinder is positioned in front of the driver's seat, so that a wide region of the driver's forward visibility is obstructed. Therefore, it is difficult to clearly see signs or obstructions or to watch the front end portion of a fork. This load lifting unit has various problems concerning safety and operation efficiency. In addition, since the lift cylinder is disposed at such a central portion between the uprights, an attachment such as a side shift fork, a fork with a winch, or a rotating i ~ ~
11~17~1 clamp, must be mounted in such a way that the base portion of the attachment is fixed to the lift member so as not to interfere with the lift cyclinder. To meet this require-ment, the attachment is generally mounted on the cross plate member or members located at the forward position of the uprights. Therefore, the distance between the load center position of the attachment and the center of the front wheels is long. Moreover, since the attachment has its own ac'cuating mechanism, the load center position is further moved forwardly away from the center of the front wheels of the truck. As a result, the permissible load as well as the fore-and-aft stability of the lift truck are reduced so that a load lifting operation attainable by using a conventional fork cannot be effected, and it is possible to obtain only the loading capacity of a less powerful lift truck, when the above-mentioned attachment is attached to the truck in place of the conventional fork.
To overcome a significant reduction in the loading capacity it has been proposed to reduce the thickness of the attachment, especially, of the actuating mechanism thereof for recovering the lost loading capacity. In the case of, for example, the rotating clamp or the rotating fork, it has been proposed to reduce the thickness of the rotator gear of the rotator while increasing the diameter thereof. ~Iowever, if the thickness of the components of the attachment is reduced, the size of the components in a vertical plane must be increased to obtain the desired mechanical strength of the components. Therefore, the L'7~1 height of the attachmen-t and the projected area of the attachment in the vertical plane are increased, and accord-ingly, the forward visibility is further obstructed and the visible range for the forward operation from the driver's seat is greatly narrowed. In this connection, a counter-measure for improving the forward visibility from the driver's seat of the lift truck has first been proposed. A
specific example of the proposal has been disclosed in 3apanese Patent Publication No. Sho 49-29661. However, there has not yet been proposed a countermeasure which can attain both an improvement in the forward visibiiity and an increase in the permissible load while further attaining positive promotion of safety.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an improved structure of a load lifting unit which is capable of improving the forward visibility from the driver's seat of a lift truck and yet capable of attaining an increase in the permissible load and an im-provement in the fore-and-aft stability of a counterbalance type lift truck.
To achieve this object, the present invention pro-poses, first, to separately dispose lift cylinders, compo-nents of a load lifting unit, on the sides of left and right uprights to form and secure a space between these uprights in order to widen the range of the forward visibi-lity, and further adopts the following arrangement. More specifically, based on the fact that the permissible load can be increased as the distance between the center of the front wheels of the lift truck and the load center is reduced, it was first decided to adopt a novel arrange-- ment for retracting from a position in front of the up-rights, a cross plate member which is one of the membershaving a relationship to the above-mentioned reduction of distance and is considered to be an indispensable consti-tuent of lift member. Then, it was further decided to accommodate an actuating means for an attachment having a large service weight within the space created by such rear-rangement. The actuating means, the lift member, etc. are thus rearranged to successfully reduce the aforesaid distance. Thus, the movement of the load center towards the truck body of the lift truck having the attachment mounted thereon was successfully accomplished. ~s a result, not only can the forward ~isibility, especially, the visibility for the forward operation from the driver's seat of the lift truck be improved but also the distance from the center of the front wheels of the lift truck to the load center can be reduced~ so that the permissible load counterbalanced with the body weight of the lift truck can ~e increased and stability in the longitudinal direction of the lift truck can be promoted. The inven-tion will be described in detail below, referring to embodiments illustrated in the accompanying drawings.
In the embodiments illustrated in the drawings, the same or like, elements for attaining the same operation are denoted by the same reference numerals.
11~17~1 DESCRIPTION OF THE DRAWINGS
Fig. 1 is a side elevational view of a first embodi-ment according to the present invention;
Fig. 2 is a schematic side view of an essential part of the same embodiment;
Fig. 3 is a perspective rear view of a main part of the same embodiment;
Fig. 4 is a partially sectional plan view of the same essential part as Fig. 3;
Fig. 5 is a diagrammatical explanatory view illustrat-ing a region in which the forward visibility is obstructed;
Fig. 6 is a side elevational view of a lift truck equipped with a load lifting unit in accordance with another embodiment of the present invention;
Fig. 7 is a rear view of an essential part of the same embodiment;
Fig. 8 is a partially sectional plan view of the essential part of the same embodiment;
Fig. 9 is a perspective view of the essential part of the same embodiment;
Fig. 10 is a side elevational view of a lift truck equipped with a load lifting unit in accordance with still another embodiment of the present invention;
Fig. 11 is a rear elevational view of an essential
2 5 part of the same embodiment;
Fig. 12 is a partially sectional plan view of the same embodiment;
Fig. 13 is a side elevational view of a lift truck 11~
equipped with a load lifting unit in accordance with a further embodiment of the present invention;
Fig. 14 is a partially sectional plan view of an essential part of the same embodiment;
Fig. 15 is a partially sectional plan view of a modification of the embodiment illustrated in Figs. 13 and 14;
Fig. 16 is a side elevational view of a lift truck equipped with a load lifting unit in accordance with a further embodiment of the present invention;
Fig. 17 is a perspective rear view of an essential part of the same embodiment;
Fig. 18 is a partially sectional plan view of the same essential part as Fig. 17, and;
Fig. 19 is a partially sectional side view of a modification of the embodiment illustrated in Figs. 16 through 18.
Figs. 1 to 5 illustrate an embodiment wherein a conventional fork is employed as an attachment for a load lifting unit of a lift truck. In the figures, 1 designates a pair of left and right uprights each consisting of an outer mast 101 and an inner mast 102 capable of moving up and down along the outer mast 101. The pair of outer masts 101 are connected at the respective upper ends by an u~per cross beam 103 and at the respective lower ends by a lower cross beam 104. On the other hand, the pair of inner masts 102 are interconnected at their respective upper and lower ends by an upper tie beam 105 and a lower -tie beam (not illustrated), respectively, and movable up and down relative to the respective outer masts 101 through respective lift rollers (not illustrated). The above--mentioned inner masts 102 and two lift cylinders 7 for 5 lifting and lowering a lift member 4 which is comprised of a pair of left and right separate side plate members 18 and cross plate members 19 which are fixed to the front t faces of the side plate members 18 so as to interconnect the side plate members 18 are disposed at the rear and 10 side of respective uprights 1 (the inner masts 102 and the left cylinders 7 may be separately disposed outside the respective uprights 1) preferably within a region which is located behind the uprights 1 so as not to obstruct further the driver's forward visibility. The lower ends of the 15 respective cylinders 7 are mounted on the lower cross beam 104 provided at the lower ends of the respective outer masts 101 at positions within spaces 30 defined by rear flanges 101' and 102' of the uprights 1, a front axle 9 and front wheels 10. The periphery of the lower end 20 portion of each of the lift cylinder 7 is encompassed by a bracket 31 formed in a box-shape and welded to a planar portion 107, a rising portion 108 of the lower cross beam 104 and the rear flange portion 101' of the outer mast 101.
On the other hand, a substantially V-shaped wheel 25 support member 11 is fixed to the upper end of a piston rod 8 provided on each of the lift cylinders 7. A lift chain 14, fixed at one end thereof to the outer mast 101 and at another end thereof to the lift member 4, is set ~141~711 around a chain wheel 12 rotatably suppo.rted by the wheel support member 11 through a shaft 13. A substantially U-shaped receiving member 15 fixed to upper end portions of the respective inner masts 102 or to the upper tie beam 105 is slidably fitted to the wheel support member 11.
The receiving member 15 has elongated guide slots 16 formed on side walls of the member 15 which are engageable with the shaft 13 of the chain wheel 12. Thus, a free lift determined by the length of the guide slots 16 is given to the lift member 4. Alternatively, there may be employed a structure wherein an elongated guide bar fixed at an end thereof to the upper tie beam 105 is employed in place of the U-shaped receiving member 15, and a vertically extending slot is formed on the wheel support member 11 at a position adjacent to the bar so that the slot may slidably receive the bar therein to provide a free lift to the lift member 4. The lift member 4 is guided by the inner masts 102 through lift rollers 6 rotatably supported at the upper and lower portions of the respective side plate members 18, and is lifted and lowered by the movement of the lift chain 14 caused by the lift cylinder 7. It should be noted here that since a lift cylinder conven-tionally disposed between the left and the right uprights 1 is divided into two and disposed on side portions of the respective uprights 1, a large space 17 is formed between the left and the right uprights 1. With regard to the left and right uprights 1, the brackets 31 welded to the lower portions of the rear flange portions 101' of the 1141~
g outer masts lOl are respectively provided with a connecting bracket 22 fitted on the front axle 9. Further, brackets 23 attached to the middle portions of the outer masts 101 are connected to an outermost end of a piston extending from each of left and right tilt cylinders 3, respectively.
Therefore, upon actuation of both tilt cylinder 3, the left and the right uprights 1 are tilted forwardly or backwardly about the front axle 9. As is apparent from the foregoing description, slnce the two lift cylinders are separately arranged on the rear and side positions of the respective uprights 1, load lifting unit components, which otherwise would obstruct the view immediately forward of the driver's seat of the truck, can be re-arranged to improve the forward visibility. As a result, inspection of the load condition on the attachment (an ordinary fork 57 is employed in the embodiment of Fig. 1) can be highly facilitated, and signs or obstructions can be observed at a glance during the operation of the lift truck. Also, because of the improvement in the operating efficiency and stability, the operator's fatigue is minimized. Since the lift cylinders 7 are symmetrically disposed at the rear of the respective uprights and within spaces 30 formed between the truck body and the uprights 1 and since the lower ends thereof are located on the same level as the lower ends of the uprights 1, the center of gravity of the entire load lifting unit is moved towards the front axle 9, enhancing the fore-and-aft stability of the entire lift truck, and the piston stroke of each of the piston rods 8 may be 1141'7~l1 suitably determined according to the length of each of the inner masts 102 to obtain a length of the upright sufficient for effecting a required lifting and lowering operation of the attachment and to allow the amount of free lift to be selected as desired.
Furthermore, when the two lift cylinders 7 are separately disposed at positions to the rear and side of the respective uprights 1, they may advantageously be disposed behind range D which is always produced in front of the respective inner masts 102 by the inner masts 102 as illustrated in Fig. 5. Furthermore, the diameter of each of the lift cylinders 7 may be freely selected if the lift cylinders 7 can be disposed behind the ranges D.
Accordingly, if lift cylinders 7 having a diameter as large as possible are employed, the load lifting capacity is greatly increased. In addition, since the lift cylinders 7 can be disposed not only near the respective inner masts 102 but also near the lift member 4 engaged with and slidable relative to the masts, and since in the chain wheels 12 provided at the top ends of the respective piston rods extending from the lift cylinders 7 each chain wheel has a laterally inner end on the periphery thereof confronting the lift member 4 and located substantially above and close to the connecting point of the lift member 4 and the chain, it is ensured that a load to be lifted can be applied to the center of the respective piston rods. Accordingly, the occurrence of unbalanced loads is reduced, an effective lifting force is exerted and packings - 1~41711 fitted to the cylinders and the pistons can be protected.
Moreover, since the periphery of the lift cylinder is not projected outwardly from the outer face of the outer mast, the inner face of the front wheels can be located very close to the outer face of the outer mast. Therefore, there is no need to increase the width of the truck per se, and also there is no danger that the cylinders will collide with obstacles.
A further embodiment of the present invention will be described with reference to Figs. 6 through 9. In the embodiment in Figs. 6 through 9, a load lifting unit for a lift truck is fitted with a side shift fork as an attachment.
The essential arrangement and the effects derived therefrom will be described hereinbelow.
In the load lifting unit of the present embodiment, two lift cylinders 7 for lifting and lowering a lift member 4 are disposed at rear and side positions of respec-tive left and right uprights 1 (they may be disposed outside of the uprights 1) and are positioned on a lower cross beam 104 of outer masts 101. Between the left and the right upright 1, there is formed a space 17. The lift member 4 is disposed within the space 17. The lift member 4 is mainly comprised, as illustrated in Fig. 8, of a pair of left and right side plates 18 each having lift rollers 6 rotatably supported on the outer face thereof, upper and lower back cross plates 21' , a front cross plate 21 and a horizontal shaft 88. The upper and lower back cross plates 21' are crossingly fixed to the rear faces of the 11~1'7~.1 - 12 ~
respective side plates 18 so that the side plates 18 are connected to one another. The front cross plate 21 is crossingly fixed to lower front portions of the respective side plates 18. The horizontal shaft 88 is provided as an 5 upper guide member on which a holder 94 to support a fork bracket 91 is slidably mounted. The front cross plate 21 is provided, on its left and right ends, with a pair of guide rollers 89. The guide rollers 89 are respectively rotatable about their own vertical axis and operate as 10 lower guide members for bearing the lower back face of the fork bracket 91~ The fork bracket 91 having the front face thereof to which a fork 57 is attached will now be described more specifically. As illustrated in Fig. 9, the fork bracket 91 is integrally formed of two upper and 15 lower fork bars 92, two left and right connecting bars 93 connected to the opposite ends of the respective upper and lower fork bars 92, the holder 94 fixed to the back of the upper fork bar 92 and slidably supported by the horizontal shaft 88 of the lift member 4 and a stopper 87 to prevent 20 forward and backward motion of the fork bracket 91. The stopper 87 has one end fixed to the upper end of the lower fork bar 92 and the other end engaged with the rear face of an upper end of the front cross plate 21 of the lift member 4. The fork bracket 91 is adapted to be shifted in 25 a lateral direction of the lift truck by a shift cylinder 90 having a cylinder head and a piston rod end pivotally supported by the inner wall of the side plate 18 of the lift member 4 and by an end portion of the holder 94.
~1~171~
Further, it should be understood from Fig. 9 that the upper end of the upper fork bar 92 and the lower end of the lower fork bar 92 are respectively provided with a notch for enabling the fork 57 to be engaged with the fork bracket 91. An apparent from the above-mentioned arrange-ment, the lift member 4 is disposed in the space 17 which is formed between the respective left and right uprights 1 due to the rearrangement of the two lift cylinders 7 at the rear of the respective uprights 1, and the actuating mechanism comprising the guide members for guiding the sliding of the fork bracket 91 of the side shift fork device and a hydraulic cylinder 94 is positioned in front of the upper back cross plate 21' within the above-mentioned space. As a result, there are provided various excellent improvements in that the forward visibility from the driver's seat is increased thereby enhancing the efficiency of the load lifting operation, and possible damage to the shift cylinder due to direct contact by the load if the load being handled collapses or falls is avoided. In addition, since the holder 94 at the back of the fork bracket 91 is disposed within the space 17, the spacing between the back of the fork bracket 91 and the front of the uprights 1 can be reduced to permit an increase in the load.
Figs. 10 through 12 illustrate a load lifting unit employing a fork device with a winch as an attachment according to still another embodiment of the present invention. For purposes of the following description, 7~1 reference made to a lift truck equipped with a fork device with a conventional winch. Load lifting components such as a lift cylinder, a chain, etc. for lifting and lowering a lift member are disposed at a central portion between left and right uprights positioned at forward portlons of a truck body, and a winding means comprised of a winch drum used for a winch device, an oil motor, and a reduction gear are disposed at positions forward of the uprights so as not to interfere with the load lifting components.
lO More specifically, the winding means is mounted on an upper back portion of a forwardly extending arm of a winch arm provided at a central portion of the lift member.
Therefore, when an operator carries out a load lifting operation, while watching a holding condition of the load 15 by the winch device or hanging state of the load by a tip end of a fork provided on the front face of the lift member, the load lifting components and the winding means such as the lift cylinder and the lift chain arranged in front of the driver's seat obstruct the forward view from 20 the driver's seat, causing degradation in the efficiency of the load lifting operation. In addition, since forward visibility is poor, it is dangerous to drive the lift truck.
A load lifting unit for a lift truck in accordance 25 with the present embodiment provides a solution for such problems. This will be described in detail referring to Figs. 10 through 12. Since the structure of an upright assembly and separate disposition of lift cylinders is 1.7~
similar to that in the foregoing embodiments, only essential portions of the present embodlment will be described in detail.
In Figs. 10 through 12, a lift member 4 comprising S a pair of left and right side plate members 18 having lift roliers 6 rotatably supported at upper and lower portions of the respective side plate members 18 and a pair of upper and lower cross plate members 19 crossingly fixed to the front ends of the respective side plate members 18 is disposed within a space 17 formed between a left and a right upright 1. The cross plate members 19 are arranged adjacent to the front face of the left and the right uprights 1 and are respectively formed with a carriage portion with which a fork 57 is engaged. The lift member 4 is adapted to be lifted and lowered by two lift cylinders 7 which being guided by inner masts 102, via the lift rollers 6.
The lift member 4 is provided with a winch device 76 and a fork 57. In this respect, the winch device 76 is mainly comprised of a winch arm 77, a winding portion 82 including a winch drum 79 for winding a wire 78 on the periphery thereof and an oil motor 81 connected to the winch drum 79 through a reduction gear 80, and guide rollers 83 for guiding the running of the wire 78. As best illustrated in Figs. 11 and 12, the winch arm 77 is mounted, at a base portion thereof, on the front face of the upper front cross plate member 19 of the lift member 4.
The guide rollers 83 are positioned at an extended tip 11~17~1 portion and a bent back portion of the winch arm 77, respectively. The winch drum 79 is rotatably supported by a bracket 84 fixed on the back of the upper cross plate member 19 and has a worm wheel 85, an element of the 5 reduction gear 80, fitted to a shaft end thereof. The oil motor 81 is also mounted on the back of the upper cross plate member 19 as is the winch drum 79 and has a worm 86, an element of the reduction gear 80, fitted to a shaft end thereof. The winch drum 79 is adapted to be driven at a 10 reduced speed through engagement between the worm 86 and the worm wheel 85.
As apparent from the foregoing description, in the present embodiment, the two lift cylinders 7 are disposed at the rear side of the respective left and right uprights 15 1, and the lift member 4 and the winding portion 82 compris-ing the winch drum 79, the reduction gear 80 and the oil motor 81 are disposed within the space 17 formed between the uprights 1 so that the winding portion 82 is accommodated at the back of the cross plate member 19 within the space 17.
20 This serves not only to improve the forward visibility from the driver's seat thereby enhancing the efficiency of the load lifting operation, but also to locate the winding portion 82 and the winch 77 closer to the truck body thereby improving the longitudinal stability of the lift 25 truck. Thus, there is provided an excellent effect in that the lift truck can be driven safely due to the improve-ment of the forward visibility.
Figs. 13 through 15 illustrate still a further 11~1'71~
embodiment of the presen-t invention wherein a load lifting unit for a lift truck is fitted with a load stabilizer device as an attachment.
Generally, when lift truck is equipped with a load stabilizer attachement, a forward end of a lift member is integrally extended forwardly from t'ne body of the lift truck to obtain a space for mounting a guide member and a stabilizer, which constitute parts of the load stabilizer attachment, between the back of cross plate members of which a fork carriage consists and uprights. More specifi-cally, a pair of left and right guide members constituting parts of the load stabilizer attachment are fixed so as to be positioned at the back of the cross plate members, and a stabilizer cylinder is fixed so as to be positioned centrally at the back of the cross plate members. Naturally, the stabilizer cylinder is positioned away from the lift cylinders so that the cylinders may be individually operated.
Therefore, in the fork lift truck eguipped with the load stabilizer attachment, the cross plate members must be located forwardly of the truck body which causes considerable reduction in the permissible load of a cargo.
The present embodiment realizes a load lifting unit which is free from the aforesaid disadvantages.
The essential arrangement and operational effect of the present embodiment will be described in detail below, but the structure of the uprights and the separate arrange-ment of lift cylinders will not be referred to here for convenience sake, since they are similar to those as 1~1'711 mentioned in the foregoing embodiments.
In Figs. 13 and 14, a lift member 4 comprising a pair of left and right side plate members 18 having lift rollers 6 rotatably supported at upper and lower portions 5 of the respective side plate members 18 and a pair of upper and lower cross plate members 19 crossingly fixed to the front ends of the respective side plate members 18 is disposed within a space 17 forMed between a leEt and a right uprigh-t 1. The cross plate members 19 are arranged 10 adjacen-t to the front face of the left and right uprights 1 and the respectively formed with a carriage portion with which a fork 57 is engaged. The lift member 4 is adapted to be lifted and lowered by two lift cylinders 7 while being guided by inner masts 102, via the lift rollers 6.
15 On the lift member 4, a load stabilizer attachment is mounted which comprises a load stabilizer means A including a clamping plate 131, arm members 129, and columns 128, guide members 126 for supporting the stabilizer means A
and controlling the lifting and lowering of the same, and 20 stabilizer cylinders 127.
The guide member 126 and the cylinder 127 are fixed inside of the respective side plate members 18 within the space 17 formed between the uprights 1 so as to align in a longitudinal direction. The arm member 129 which extends 25 forwardly and substantially horizontally is fixed at a base portion thereof to the upper end of the column 128 fitted in a guide portion of the guide member 126 for lifting and lowering and swingably supports the clamping 11~171~
plate 131 through a pin 130.
132 is a connecting membe.r connected, at a tip end, to the base end of the arm member 129 and connected, at a base end, to a tip end of a piston rod of the stabilizer cylinder 127. It should be noted that the connecting member 132 may be directly connected to the columns 128.
133 and 134 designate reinforcing members interconnecting the arm members 129, and 57 designates a fork engaged with the cross plate members 19.
In the lift truck structured as mentioned above, when the stabilizer cylinders 127 are actuated, the columns 128 fitted in the respective guide members 126 move up and down so that the clamping plate 131 is lifted and lowered through the arm members 129. By disposing the two lift cylinders 7 for lifting and lowering the lift member 4 at the rear and side positions or outer side positions of the respective outer masts 101 to provide the space i7 between the left and the right uprights 1 and by fixing the guide members 126 which support the load stabilizer means A and the stabilizer cylinders 127 which control the up and down movement of the load stabilizer means A to the insides of the lift member 4 located within the space, the guide members 126 and the stabilizer cylinders 127 prevent the cross plate members 19 from being displaced forwardly.
Further, the rear faces of the cross plate members 19 and the front faces of the uprights 1 can be arranged as close as possible so as to effectively suppress a reduction in the permissible load caused by the mounting of the attachment 1~4~l7 ~1 and so as to improve the loading capacity and the longi-tudinal stability of the lift truck. Furthermore, since the guide members 126 and the stabilizer cylinders 127 are provided on the insides of the side plates 18 of the lift members 4 so as to be aligned in a longitudinal direction, there can be provided such significant advantages that the frontward visibility from the driver's seat is greatly improved, and the columns 128, guide members 126 and the stabilizer cylinders 127 are protected against possible lo damage.
The invention is not limited to the structure of the embodiment, and a structure wherein the arrangements of the guide members 126 and the stabilizer cylinders 127 are modified may also be employed. Also as illustrated in Fig. 15, there may be employed a structure wherein the guide members 126 and the stabilizer cylinders 127 are preliminarily fixed to a box-shaped bracket 135, which is fixed to the insides of the respective side plate members 18 and the backs of the cross plate member 19 by means of bolts 136. This arrangement has the effect of greatly facilitating the mounting and dismounting operation of the load stabilizer attachment on and from the lift truck.
Therefore, with the load stabilizer attachment being attached to the lift truck, it is possible to easily carry out the replacement of the load stabilizer attachment by a conventional fork, as required.
Figs. 16 through 18 illustrate a further embodiment of the present invention in which a rotating actuating 11417~L1 mechanism, such as a clamping device is attached to a lift truck as an attachment. In the embodiment illustrated in Figs. 16 through 18, a left and a right upright 1 and lift cylinders 7 are structured and arranged in the like manner S as in the foregoing embodiments. Accordingly, the partic-ulars thereof will not be repeated here and only charac-teristic structures and operational effects particular to the present embodiment will be described.
In a space 17 formed between a left and a right upright 1 due to the separate arrangement of two lift cylinders 7 at the rear side of the respective uprights 1, there is arranged a lift member 4 comprised of a pair of left and right side plates 18 each having lift rollers 6 rotatably supported at upper and lower portions thereof, 15 respectively, and an upper and a lower cross plate member 19 crossingly fixed to the front faces of the side plates 18.
The lift member 4 is adapted to be lifted and lowered by the lift cylinders 7 while being guided by inner masts 102 through the lift rollers 6.
On the front face of the cross plate member 19 of the lift member 4, there is provided a rotation actuating mechanism 25 for an operating attachment (not illustrated) such as a rotating fork and a rotating clamp. The rotation actuating mechanism 25 will now be described more specifi-25 cally. As illustrated in Figs. 17 and 18, the rotation actuating mechanism 25 is mainly comprised of a rotator 26 having a toothed periphery, an oil motor 27, a reduction gear 28 (including a change mechanism for a drum shaft 11~1711 position) driven by the oil motor 27, and a pinion 29 fitted to the shaft end of the reduction gear 28 and adapted to rotate the rotator 26 at a reduced low speed.
The rotator 26 is attached to the front faces of the cross 5 plate members 19 of the lift member 4. Further, to the front face of the rotator 26, an operating attachment tnot illustrated), such as a pair of clamping arms is fixed. A
driving portion 32 comprised of the oil motor 27 and the reduction gear 28 vertically and directly connected to the 10 motor 27 is vertically arranged on the back face of the upper cross plate member 19 within the space 17.
If the rotator 26 has an internally-toothed gear, the reduciton gear 28 with the oil motor 27 having the pinion 29 fitted to the shaft end thereof may be fixed to 15 the back face of the cross plate member 19 by means of screw bolts in the same manner as mentioned abcve. This modification is illustrated in partial sectional plan view in Fig. 19.
As is apparent from the foregoing description, by 20 arranging the driving portion 32 such as the oil motor and the reduction gear of the rotation actuating mechanism 25 at the rear of the cross plate member 19 of the lift member 4, the driving portion 32 is accommodated in the space 17 between the left and the right upright 1. As a 25 result, in the lift truck according to the embodiment in Figs. 16 through 19, the above-mentioned rotation actuating mechanism 25 is positioned close to the truc}c body 2.
Consequently, the space between the center of the front 114171~
wheels 10 and the front face of the rota-tor 26 can be small. Accordingly, compared w:ith the conventional arrangement in which the rotation actuating mechanism is positioned in front of the uprights, the center of the load can be positioned close to the truck body 2. This fact contributes not only to improving the longitudinal stabi-lity of lift truck but also to enhancing the load capacity of the lift truck. Further, the forward visibility from the driver's seat is enlarged because the disadvantages involved in the conventional arrangement wherein attachment components are formed thin but large in diameter to obtain a necessary loading capacity are eliminated. In addition, an arrangement of the two lift cylinders 7 at the rear side positions of the respective uprights 1 also contrlbutes to an improved forward visibility from the driver's seat.
Furthermore, since the lift cylinders 7 are arranged on the left and the right side, respectively, a stable load handl-ing operation can be assured even if an unbalanced load is applied to the rotating clamp. Still further, the drive portion, such as the oil motor and the reduction gear, is advantageously protected by the cross plate members, the uprights, etc. so as not to be directly contacted by cargo and subjected to damage if the cargo accidentally falls.
In the embodiment illustrated in Figs. 16 through 19, the cross plate members 19 of the lift member 4 are arranged in front of the front faces of the uprights 1.
However, if the lateral lengths of the cross plate members 19 are shortened so that the members 19 are completely positioned within the space 17 fonmed between the respec-tive uprights 1, the rotator 26 which is attached to the front faces of the cross plate members 19 will be posi-tioned still closer to the truck body 2. As a result, the improvements or the advantages obtained from the embodiment of Figs. 16 through 19 will be further promoted.
Although the invention has been described referring to the preferred embodiments thereof, various modifications and changes may be carried out within the scope of the present invention as set forth in the appended claims.
Fig. 12 is a partially sectional plan view of the same embodiment;
Fig. 13 is a side elevational view of a lift truck 11~
equipped with a load lifting unit in accordance with a further embodiment of the present invention;
Fig. 14 is a partially sectional plan view of an essential part of the same embodiment;
Fig. 15 is a partially sectional plan view of a modification of the embodiment illustrated in Figs. 13 and 14;
Fig. 16 is a side elevational view of a lift truck equipped with a load lifting unit in accordance with a further embodiment of the present invention;
Fig. 17 is a perspective rear view of an essential part of the same embodiment;
Fig. 18 is a partially sectional plan view of the same essential part as Fig. 17, and;
Fig. 19 is a partially sectional side view of a modification of the embodiment illustrated in Figs. 16 through 18.
Figs. 1 to 5 illustrate an embodiment wherein a conventional fork is employed as an attachment for a load lifting unit of a lift truck. In the figures, 1 designates a pair of left and right uprights each consisting of an outer mast 101 and an inner mast 102 capable of moving up and down along the outer mast 101. The pair of outer masts 101 are connected at the respective upper ends by an u~per cross beam 103 and at the respective lower ends by a lower cross beam 104. On the other hand, the pair of inner masts 102 are interconnected at their respective upper and lower ends by an upper tie beam 105 and a lower -tie beam (not illustrated), respectively, and movable up and down relative to the respective outer masts 101 through respective lift rollers (not illustrated). The above--mentioned inner masts 102 and two lift cylinders 7 for 5 lifting and lowering a lift member 4 which is comprised of a pair of left and right separate side plate members 18 and cross plate members 19 which are fixed to the front t faces of the side plate members 18 so as to interconnect the side plate members 18 are disposed at the rear and 10 side of respective uprights 1 (the inner masts 102 and the left cylinders 7 may be separately disposed outside the respective uprights 1) preferably within a region which is located behind the uprights 1 so as not to obstruct further the driver's forward visibility. The lower ends of the 15 respective cylinders 7 are mounted on the lower cross beam 104 provided at the lower ends of the respective outer masts 101 at positions within spaces 30 defined by rear flanges 101' and 102' of the uprights 1, a front axle 9 and front wheels 10. The periphery of the lower end 20 portion of each of the lift cylinder 7 is encompassed by a bracket 31 formed in a box-shape and welded to a planar portion 107, a rising portion 108 of the lower cross beam 104 and the rear flange portion 101' of the outer mast 101.
On the other hand, a substantially V-shaped wheel 25 support member 11 is fixed to the upper end of a piston rod 8 provided on each of the lift cylinders 7. A lift chain 14, fixed at one end thereof to the outer mast 101 and at another end thereof to the lift member 4, is set ~141~711 around a chain wheel 12 rotatably suppo.rted by the wheel support member 11 through a shaft 13. A substantially U-shaped receiving member 15 fixed to upper end portions of the respective inner masts 102 or to the upper tie beam 105 is slidably fitted to the wheel support member 11.
The receiving member 15 has elongated guide slots 16 formed on side walls of the member 15 which are engageable with the shaft 13 of the chain wheel 12. Thus, a free lift determined by the length of the guide slots 16 is given to the lift member 4. Alternatively, there may be employed a structure wherein an elongated guide bar fixed at an end thereof to the upper tie beam 105 is employed in place of the U-shaped receiving member 15, and a vertically extending slot is formed on the wheel support member 11 at a position adjacent to the bar so that the slot may slidably receive the bar therein to provide a free lift to the lift member 4. The lift member 4 is guided by the inner masts 102 through lift rollers 6 rotatably supported at the upper and lower portions of the respective side plate members 18, and is lifted and lowered by the movement of the lift chain 14 caused by the lift cylinder 7. It should be noted here that since a lift cylinder conven-tionally disposed between the left and the right uprights 1 is divided into two and disposed on side portions of the respective uprights 1, a large space 17 is formed between the left and the right uprights 1. With regard to the left and right uprights 1, the brackets 31 welded to the lower portions of the rear flange portions 101' of the 1141~
g outer masts lOl are respectively provided with a connecting bracket 22 fitted on the front axle 9. Further, brackets 23 attached to the middle portions of the outer masts 101 are connected to an outermost end of a piston extending from each of left and right tilt cylinders 3, respectively.
Therefore, upon actuation of both tilt cylinder 3, the left and the right uprights 1 are tilted forwardly or backwardly about the front axle 9. As is apparent from the foregoing description, slnce the two lift cylinders are separately arranged on the rear and side positions of the respective uprights 1, load lifting unit components, which otherwise would obstruct the view immediately forward of the driver's seat of the truck, can be re-arranged to improve the forward visibility. As a result, inspection of the load condition on the attachment (an ordinary fork 57 is employed in the embodiment of Fig. 1) can be highly facilitated, and signs or obstructions can be observed at a glance during the operation of the lift truck. Also, because of the improvement in the operating efficiency and stability, the operator's fatigue is minimized. Since the lift cylinders 7 are symmetrically disposed at the rear of the respective uprights and within spaces 30 formed between the truck body and the uprights 1 and since the lower ends thereof are located on the same level as the lower ends of the uprights 1, the center of gravity of the entire load lifting unit is moved towards the front axle 9, enhancing the fore-and-aft stability of the entire lift truck, and the piston stroke of each of the piston rods 8 may be 1141'7~l1 suitably determined according to the length of each of the inner masts 102 to obtain a length of the upright sufficient for effecting a required lifting and lowering operation of the attachment and to allow the amount of free lift to be selected as desired.
Furthermore, when the two lift cylinders 7 are separately disposed at positions to the rear and side of the respective uprights 1, they may advantageously be disposed behind range D which is always produced in front of the respective inner masts 102 by the inner masts 102 as illustrated in Fig. 5. Furthermore, the diameter of each of the lift cylinders 7 may be freely selected if the lift cylinders 7 can be disposed behind the ranges D.
Accordingly, if lift cylinders 7 having a diameter as large as possible are employed, the load lifting capacity is greatly increased. In addition, since the lift cylinders 7 can be disposed not only near the respective inner masts 102 but also near the lift member 4 engaged with and slidable relative to the masts, and since in the chain wheels 12 provided at the top ends of the respective piston rods extending from the lift cylinders 7 each chain wheel has a laterally inner end on the periphery thereof confronting the lift member 4 and located substantially above and close to the connecting point of the lift member 4 and the chain, it is ensured that a load to be lifted can be applied to the center of the respective piston rods. Accordingly, the occurrence of unbalanced loads is reduced, an effective lifting force is exerted and packings - 1~41711 fitted to the cylinders and the pistons can be protected.
Moreover, since the periphery of the lift cylinder is not projected outwardly from the outer face of the outer mast, the inner face of the front wheels can be located very close to the outer face of the outer mast. Therefore, there is no need to increase the width of the truck per se, and also there is no danger that the cylinders will collide with obstacles.
A further embodiment of the present invention will be described with reference to Figs. 6 through 9. In the embodiment in Figs. 6 through 9, a load lifting unit for a lift truck is fitted with a side shift fork as an attachment.
The essential arrangement and the effects derived therefrom will be described hereinbelow.
In the load lifting unit of the present embodiment, two lift cylinders 7 for lifting and lowering a lift member 4 are disposed at rear and side positions of respec-tive left and right uprights 1 (they may be disposed outside of the uprights 1) and are positioned on a lower cross beam 104 of outer masts 101. Between the left and the right upright 1, there is formed a space 17. The lift member 4 is disposed within the space 17. The lift member 4 is mainly comprised, as illustrated in Fig. 8, of a pair of left and right side plates 18 each having lift rollers 6 rotatably supported on the outer face thereof, upper and lower back cross plates 21' , a front cross plate 21 and a horizontal shaft 88. The upper and lower back cross plates 21' are crossingly fixed to the rear faces of the 11~1'7~.1 - 12 ~
respective side plates 18 so that the side plates 18 are connected to one another. The front cross plate 21 is crossingly fixed to lower front portions of the respective side plates 18. The horizontal shaft 88 is provided as an 5 upper guide member on which a holder 94 to support a fork bracket 91 is slidably mounted. The front cross plate 21 is provided, on its left and right ends, with a pair of guide rollers 89. The guide rollers 89 are respectively rotatable about their own vertical axis and operate as 10 lower guide members for bearing the lower back face of the fork bracket 91~ The fork bracket 91 having the front face thereof to which a fork 57 is attached will now be described more specifically. As illustrated in Fig. 9, the fork bracket 91 is integrally formed of two upper and 15 lower fork bars 92, two left and right connecting bars 93 connected to the opposite ends of the respective upper and lower fork bars 92, the holder 94 fixed to the back of the upper fork bar 92 and slidably supported by the horizontal shaft 88 of the lift member 4 and a stopper 87 to prevent 20 forward and backward motion of the fork bracket 91. The stopper 87 has one end fixed to the upper end of the lower fork bar 92 and the other end engaged with the rear face of an upper end of the front cross plate 21 of the lift member 4. The fork bracket 91 is adapted to be shifted in 25 a lateral direction of the lift truck by a shift cylinder 90 having a cylinder head and a piston rod end pivotally supported by the inner wall of the side plate 18 of the lift member 4 and by an end portion of the holder 94.
~1~171~
Further, it should be understood from Fig. 9 that the upper end of the upper fork bar 92 and the lower end of the lower fork bar 92 are respectively provided with a notch for enabling the fork 57 to be engaged with the fork bracket 91. An apparent from the above-mentioned arrange-ment, the lift member 4 is disposed in the space 17 which is formed between the respective left and right uprights 1 due to the rearrangement of the two lift cylinders 7 at the rear of the respective uprights 1, and the actuating mechanism comprising the guide members for guiding the sliding of the fork bracket 91 of the side shift fork device and a hydraulic cylinder 94 is positioned in front of the upper back cross plate 21' within the above-mentioned space. As a result, there are provided various excellent improvements in that the forward visibility from the driver's seat is increased thereby enhancing the efficiency of the load lifting operation, and possible damage to the shift cylinder due to direct contact by the load if the load being handled collapses or falls is avoided. In addition, since the holder 94 at the back of the fork bracket 91 is disposed within the space 17, the spacing between the back of the fork bracket 91 and the front of the uprights 1 can be reduced to permit an increase in the load.
Figs. 10 through 12 illustrate a load lifting unit employing a fork device with a winch as an attachment according to still another embodiment of the present invention. For purposes of the following description, 7~1 reference made to a lift truck equipped with a fork device with a conventional winch. Load lifting components such as a lift cylinder, a chain, etc. for lifting and lowering a lift member are disposed at a central portion between left and right uprights positioned at forward portlons of a truck body, and a winding means comprised of a winch drum used for a winch device, an oil motor, and a reduction gear are disposed at positions forward of the uprights so as not to interfere with the load lifting components.
lO More specifically, the winding means is mounted on an upper back portion of a forwardly extending arm of a winch arm provided at a central portion of the lift member.
Therefore, when an operator carries out a load lifting operation, while watching a holding condition of the load 15 by the winch device or hanging state of the load by a tip end of a fork provided on the front face of the lift member, the load lifting components and the winding means such as the lift cylinder and the lift chain arranged in front of the driver's seat obstruct the forward view from 20 the driver's seat, causing degradation in the efficiency of the load lifting operation. In addition, since forward visibility is poor, it is dangerous to drive the lift truck.
A load lifting unit for a lift truck in accordance 25 with the present embodiment provides a solution for such problems. This will be described in detail referring to Figs. 10 through 12. Since the structure of an upright assembly and separate disposition of lift cylinders is 1.7~
similar to that in the foregoing embodiments, only essential portions of the present embodlment will be described in detail.
In Figs. 10 through 12, a lift member 4 comprising S a pair of left and right side plate members 18 having lift roliers 6 rotatably supported at upper and lower portions of the respective side plate members 18 and a pair of upper and lower cross plate members 19 crossingly fixed to the front ends of the respective side plate members 18 is disposed within a space 17 formed between a left and a right upright 1. The cross plate members 19 are arranged adjacent to the front face of the left and the right uprights 1 and are respectively formed with a carriage portion with which a fork 57 is engaged. The lift member 4 is adapted to be lifted and lowered by two lift cylinders 7 which being guided by inner masts 102, via the lift rollers 6.
The lift member 4 is provided with a winch device 76 and a fork 57. In this respect, the winch device 76 is mainly comprised of a winch arm 77, a winding portion 82 including a winch drum 79 for winding a wire 78 on the periphery thereof and an oil motor 81 connected to the winch drum 79 through a reduction gear 80, and guide rollers 83 for guiding the running of the wire 78. As best illustrated in Figs. 11 and 12, the winch arm 77 is mounted, at a base portion thereof, on the front face of the upper front cross plate member 19 of the lift member 4.
The guide rollers 83 are positioned at an extended tip 11~17~1 portion and a bent back portion of the winch arm 77, respectively. The winch drum 79 is rotatably supported by a bracket 84 fixed on the back of the upper cross plate member 19 and has a worm wheel 85, an element of the 5 reduction gear 80, fitted to a shaft end thereof. The oil motor 81 is also mounted on the back of the upper cross plate member 19 as is the winch drum 79 and has a worm 86, an element of the reduction gear 80, fitted to a shaft end thereof. The winch drum 79 is adapted to be driven at a 10 reduced speed through engagement between the worm 86 and the worm wheel 85.
As apparent from the foregoing description, in the present embodiment, the two lift cylinders 7 are disposed at the rear side of the respective left and right uprights 15 1, and the lift member 4 and the winding portion 82 compris-ing the winch drum 79, the reduction gear 80 and the oil motor 81 are disposed within the space 17 formed between the uprights 1 so that the winding portion 82 is accommodated at the back of the cross plate member 19 within the space 17.
20 This serves not only to improve the forward visibility from the driver's seat thereby enhancing the efficiency of the load lifting operation, but also to locate the winding portion 82 and the winch 77 closer to the truck body thereby improving the longitudinal stability of the lift 25 truck. Thus, there is provided an excellent effect in that the lift truck can be driven safely due to the improve-ment of the forward visibility.
Figs. 13 through 15 illustrate still a further 11~1'71~
embodiment of the presen-t invention wherein a load lifting unit for a lift truck is fitted with a load stabilizer device as an attachment.
Generally, when lift truck is equipped with a load stabilizer attachement, a forward end of a lift member is integrally extended forwardly from t'ne body of the lift truck to obtain a space for mounting a guide member and a stabilizer, which constitute parts of the load stabilizer attachment, between the back of cross plate members of which a fork carriage consists and uprights. More specifi-cally, a pair of left and right guide members constituting parts of the load stabilizer attachment are fixed so as to be positioned at the back of the cross plate members, and a stabilizer cylinder is fixed so as to be positioned centrally at the back of the cross plate members. Naturally, the stabilizer cylinder is positioned away from the lift cylinders so that the cylinders may be individually operated.
Therefore, in the fork lift truck eguipped with the load stabilizer attachment, the cross plate members must be located forwardly of the truck body which causes considerable reduction in the permissible load of a cargo.
The present embodiment realizes a load lifting unit which is free from the aforesaid disadvantages.
The essential arrangement and operational effect of the present embodiment will be described in detail below, but the structure of the uprights and the separate arrange-ment of lift cylinders will not be referred to here for convenience sake, since they are similar to those as 1~1'711 mentioned in the foregoing embodiments.
In Figs. 13 and 14, a lift member 4 comprising a pair of left and right side plate members 18 having lift rollers 6 rotatably supported at upper and lower portions 5 of the respective side plate members 18 and a pair of upper and lower cross plate members 19 crossingly fixed to the front ends of the respective side plate members 18 is disposed within a space 17 forMed between a leEt and a right uprigh-t 1. The cross plate members 19 are arranged 10 adjacen-t to the front face of the left and right uprights 1 and the respectively formed with a carriage portion with which a fork 57 is engaged. The lift member 4 is adapted to be lifted and lowered by two lift cylinders 7 while being guided by inner masts 102, via the lift rollers 6.
15 On the lift member 4, a load stabilizer attachment is mounted which comprises a load stabilizer means A including a clamping plate 131, arm members 129, and columns 128, guide members 126 for supporting the stabilizer means A
and controlling the lifting and lowering of the same, and 20 stabilizer cylinders 127.
The guide member 126 and the cylinder 127 are fixed inside of the respective side plate members 18 within the space 17 formed between the uprights 1 so as to align in a longitudinal direction. The arm member 129 which extends 25 forwardly and substantially horizontally is fixed at a base portion thereof to the upper end of the column 128 fitted in a guide portion of the guide member 126 for lifting and lowering and swingably supports the clamping 11~171~
plate 131 through a pin 130.
132 is a connecting membe.r connected, at a tip end, to the base end of the arm member 129 and connected, at a base end, to a tip end of a piston rod of the stabilizer cylinder 127. It should be noted that the connecting member 132 may be directly connected to the columns 128.
133 and 134 designate reinforcing members interconnecting the arm members 129, and 57 designates a fork engaged with the cross plate members 19.
In the lift truck structured as mentioned above, when the stabilizer cylinders 127 are actuated, the columns 128 fitted in the respective guide members 126 move up and down so that the clamping plate 131 is lifted and lowered through the arm members 129. By disposing the two lift cylinders 7 for lifting and lowering the lift member 4 at the rear and side positions or outer side positions of the respective outer masts 101 to provide the space i7 between the left and the right uprights 1 and by fixing the guide members 126 which support the load stabilizer means A and the stabilizer cylinders 127 which control the up and down movement of the load stabilizer means A to the insides of the lift member 4 located within the space, the guide members 126 and the stabilizer cylinders 127 prevent the cross plate members 19 from being displaced forwardly.
Further, the rear faces of the cross plate members 19 and the front faces of the uprights 1 can be arranged as close as possible so as to effectively suppress a reduction in the permissible load caused by the mounting of the attachment 1~4~l7 ~1 and so as to improve the loading capacity and the longi-tudinal stability of the lift truck. Furthermore, since the guide members 126 and the stabilizer cylinders 127 are provided on the insides of the side plates 18 of the lift members 4 so as to be aligned in a longitudinal direction, there can be provided such significant advantages that the frontward visibility from the driver's seat is greatly improved, and the columns 128, guide members 126 and the stabilizer cylinders 127 are protected against possible lo damage.
The invention is not limited to the structure of the embodiment, and a structure wherein the arrangements of the guide members 126 and the stabilizer cylinders 127 are modified may also be employed. Also as illustrated in Fig. 15, there may be employed a structure wherein the guide members 126 and the stabilizer cylinders 127 are preliminarily fixed to a box-shaped bracket 135, which is fixed to the insides of the respective side plate members 18 and the backs of the cross plate member 19 by means of bolts 136. This arrangement has the effect of greatly facilitating the mounting and dismounting operation of the load stabilizer attachment on and from the lift truck.
Therefore, with the load stabilizer attachment being attached to the lift truck, it is possible to easily carry out the replacement of the load stabilizer attachment by a conventional fork, as required.
Figs. 16 through 18 illustrate a further embodiment of the present invention in which a rotating actuating 11417~L1 mechanism, such as a clamping device is attached to a lift truck as an attachment. In the embodiment illustrated in Figs. 16 through 18, a left and a right upright 1 and lift cylinders 7 are structured and arranged in the like manner S as in the foregoing embodiments. Accordingly, the partic-ulars thereof will not be repeated here and only charac-teristic structures and operational effects particular to the present embodiment will be described.
In a space 17 formed between a left and a right upright 1 due to the separate arrangement of two lift cylinders 7 at the rear side of the respective uprights 1, there is arranged a lift member 4 comprised of a pair of left and right side plates 18 each having lift rollers 6 rotatably supported at upper and lower portions thereof, 15 respectively, and an upper and a lower cross plate member 19 crossingly fixed to the front faces of the side plates 18.
The lift member 4 is adapted to be lifted and lowered by the lift cylinders 7 while being guided by inner masts 102 through the lift rollers 6.
On the front face of the cross plate member 19 of the lift member 4, there is provided a rotation actuating mechanism 25 for an operating attachment (not illustrated) such as a rotating fork and a rotating clamp. The rotation actuating mechanism 25 will now be described more specifi-25 cally. As illustrated in Figs. 17 and 18, the rotation actuating mechanism 25 is mainly comprised of a rotator 26 having a toothed periphery, an oil motor 27, a reduction gear 28 (including a change mechanism for a drum shaft 11~1711 position) driven by the oil motor 27, and a pinion 29 fitted to the shaft end of the reduction gear 28 and adapted to rotate the rotator 26 at a reduced low speed.
The rotator 26 is attached to the front faces of the cross 5 plate members 19 of the lift member 4. Further, to the front face of the rotator 26, an operating attachment tnot illustrated), such as a pair of clamping arms is fixed. A
driving portion 32 comprised of the oil motor 27 and the reduction gear 28 vertically and directly connected to the 10 motor 27 is vertically arranged on the back face of the upper cross plate member 19 within the space 17.
If the rotator 26 has an internally-toothed gear, the reduciton gear 28 with the oil motor 27 having the pinion 29 fitted to the shaft end thereof may be fixed to 15 the back face of the cross plate member 19 by means of screw bolts in the same manner as mentioned abcve. This modification is illustrated in partial sectional plan view in Fig. 19.
As is apparent from the foregoing description, by 20 arranging the driving portion 32 such as the oil motor and the reduction gear of the rotation actuating mechanism 25 at the rear of the cross plate member 19 of the lift member 4, the driving portion 32 is accommodated in the space 17 between the left and the right upright 1. As a 25 result, in the lift truck according to the embodiment in Figs. 16 through 19, the above-mentioned rotation actuating mechanism 25 is positioned close to the truc}c body 2.
Consequently, the space between the center of the front 114171~
wheels 10 and the front face of the rota-tor 26 can be small. Accordingly, compared w:ith the conventional arrangement in which the rotation actuating mechanism is positioned in front of the uprights, the center of the load can be positioned close to the truck body 2. This fact contributes not only to improving the longitudinal stabi-lity of lift truck but also to enhancing the load capacity of the lift truck. Further, the forward visibility from the driver's seat is enlarged because the disadvantages involved in the conventional arrangement wherein attachment components are formed thin but large in diameter to obtain a necessary loading capacity are eliminated. In addition, an arrangement of the two lift cylinders 7 at the rear side positions of the respective uprights 1 also contrlbutes to an improved forward visibility from the driver's seat.
Furthermore, since the lift cylinders 7 are arranged on the left and the right side, respectively, a stable load handl-ing operation can be assured even if an unbalanced load is applied to the rotating clamp. Still further, the drive portion, such as the oil motor and the reduction gear, is advantageously protected by the cross plate members, the uprights, etc. so as not to be directly contacted by cargo and subjected to damage if the cargo accidentally falls.
In the embodiment illustrated in Figs. 16 through 19, the cross plate members 19 of the lift member 4 are arranged in front of the front faces of the uprights 1.
However, if the lateral lengths of the cross plate members 19 are shortened so that the members 19 are completely positioned within the space 17 fonmed between the respec-tive uprights 1, the rotator 26 which is attached to the front faces of the cross plate members 19 will be posi-tioned still closer to the truck body 2. As a result, the improvements or the advantages obtained from the embodiment of Figs. 16 through 19 will be further promoted.
Although the invention has been described referring to the preferred embodiments thereof, various modifications and changes may be carried out within the scope of the present invention as set forth in the appended claims.
Claims (13)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A lift truck having a pair of left and right uprights constituted by a pair of left and right outer masts provided at front portions of the truck body of the lift truck and by a pair of left and right inner masts arranged to be moved up and down along said outer masts, a lift member engaged with said inner masts so as to be moved up and down therewith, two lift cylinders separately disposed adjacent to said left and right uprights, respectively, for lifting and lowering said inner masts and said lift member relative to said outer masts and said inner masts, each of said two lift cylinders being disposed within a respective area in which the view from the driver's seat of the lift truck is obstructed by said uprights, an attachment carried by said lift member and including a component movable relatively to the lift member, and a motor or cylinder for actuating the movable component, said motor or actuator cylinder being arranged in a space extending between said pair of uprights.
2. A load lifting unit for a lift truck as set forth in claim 1, wherein said two lift cylinders are disposed at positions to the rear and side of the respective uprights and within such an area that the forward visibility from the driver's seat of said lift truck is obstructed by said uprights and said cylinders are held at lower ends thereof by lower ends of the corresponding outer masts.
3. A load lifting unit for a lift truck as set forth in claim 1, wherein said lift member is comprised of a pair of side plate members spaced from each other in a lateral direction perpendicular to a longitudinal axis of said truck body of said lift truck and at least one cross plate member connecting said side plate members to each other, said side plate members of the lift member being engaged with the corresponding inner masts, via roller members.
4. A load lifting unit for a lift truck as set forth in claim 3, wherein said cross plate member extends in a lateral direction perpendicular to a longitudinal axis of said truck body in front of said uprights, said cross plate member constituting a fork carriage for fixing thereto a fork.
5. A load lift unit for a lift truck as set forth in claim 3, wherein the length of said cross plate member extending in the lateral direction is smaller than the lateral width of said space formed between the left and the right upright assembly and is capable of being accommodated within said space.
6. A load lifting unit for a lift truck as set forth in claim 4, wherein said attachment is comprised of a winch device, said winch device having a winding means fixed to the back of said fork carriage of said lift member.
7. A load lifting unit for a lift truck as set forth in claim 4, wherein said attachment is comprised of a load stabilizer device, and guide members for supporting said load stabilizer device and a stabilizer cylinder or stabilizer cylinders for controlling the lifting and lowering of said load stabilizer device are fixed to said lift member at positions within said space.
8. A load lifting unit for a lift truck as set forth in claim 7, wherein pairs of said guide members and said stabilizer cylinders are fixed to said left and said right side plate members, respectively.
9. A load lifting unit for a lift truck as set forth in claim 7, wherein a pair of said guide members are fixed to the left and the right side plate members, respectively, and a single stabilizer cylinder is fixed to said fork carriage.
10. A load lifting unit for a lift truck as set forth in claim 7, wherein said guide members and said stabilizer cylinders are fixed to a box-type bracket removable relative to said lift member.
11. A load lifting unit for a lift truck as set forth in claim 5, wherein said attachment is comprised of a side shift fork provided with a fork bracket slidable in a lateral direction which crosses the longitudinal axis of said truck body relative to said lift member having the cross plate member disposed on the back of said side plate members, and guide members disposed at upper and lower portions of said lift member, respectively, so as to extend between said left and right side plate members for guiding the sliding motion of said fork bracket and a shift cylinder pivotally connected, at a cylinder end and a piston rod end thereof, to the side plate member of said lift member and the fork bracket, respectively, are arranged at the rear of said fork bracket within said space.
12. A load lifting unit for a lift truck as set forth in claim 5, wherein said attachment is comprised of a rotating attachment and is mounted on the front face of the cross plate member disposed at the forward portion of said side plate members, and said actuating means for rotating said rotating attachment is mounted at the back of said cross plate member.
13. A load lifting unit for a lift truck as set forth in claim 5, wherein a cross plate member is disposed at the forward portion of said side plate members to form the lift member, a rotating attachment is mounted on the front face of said cross plate member, and the actuating means for said rotating attachment is mounted on the upper end of said lift member within the space between the left and right uprights.
Applications Claiming Priority (18)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3292579A JPS55123892A (en) | 1979-03-20 | 1979-03-20 | Cargo work device for forklift |
| JP32925/79 | 1979-03-20 | ||
| JP3297879A JPS6045120B2 (en) | 1979-03-21 | 1979-03-21 | Forklift truck cargo handling equipment |
| JP32978/79 | 1979-03-21 | ||
| JP3399079A JPS55130493A (en) | 1979-03-22 | 1979-03-22 | Reach fork device of fork lift |
| JP3398979A JPS6014756B2 (en) | 1979-03-22 | 1979-03-22 | Forklift reach fork equipment |
| JP33990/79 | 1979-03-22 | ||
| JP33989/79 | 1979-03-22 | ||
| JP34541/79 | 1979-03-23 | ||
| JP3454279A JPS6014760B2 (en) | 1979-03-23 | 1979-03-23 | Cargo handling equipment on forklift trucks |
| JP34542/79 | 1979-03-23 | ||
| JP3454179A JPS6014757B2 (en) | 1979-03-23 | 1979-03-23 | Cargo handling equipment on forklift trucks |
| JP3667479A JPS6014755B2 (en) | 1979-03-27 | 1979-03-27 | Cargo handling equipment on forklift trucks |
| JP36674/79 | 1979-03-27 | ||
| JP3667379A JPS55130495A (en) | 1979-03-27 | 1979-03-27 | Reach fork device of fork lift |
| JP36673/79 | 1979-03-27 | ||
| JP44780/79 | 1979-04-11 | ||
| JP4478079A JPS6014758B2 (en) | 1979-04-11 | 1979-04-11 | Cargo handling equipment on forklift trucks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1141711A true CA1141711A (en) | 1983-02-22 |
Family
ID=27576867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000347748A Expired CA1141711A (en) | 1979-03-20 | 1980-03-14 | Load lifting unit for lift truck |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1141711A (en) |
| FR (1) | FR2451884B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105851260A (en) * | 2016-06-14 | 2016-08-17 | 重庆恒阳食品有限公司 | Bamboo stick feeding device for automatic bean bar machine |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0058150B1 (en) * | 1980-08-22 | 1987-10-28 | Caterpillar Industrial Inc. | Equalizing system for load lifting apparatus |
| GB2115378A (en) * | 1982-02-17 | 1983-09-07 | Rodman S Dev Co Ltd | Conveying apparatus |
| WO1989010602A1 (en) * | 1988-04-28 | 1989-11-02 | Ralf Oertzen | Paper-distributing device |
| FR2791049B1 (en) * | 1999-03-19 | 2001-06-01 | Sambron | EQUIPMENT CARRIER FOR A LIFTING MACHINE, A MAT OF A LIFTING MACHINE COMPRISING SUCH AN EQUIPMENT CARRIER AND LIFTING MACHINE SUCH AS A FORK TROLLEY PROVIDED WITH SAID MAT |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1031772A (en) * | 1962-04-13 | 1966-06-02 | Lansing Bagnall Ltd | Improvements in or relating to fork and like load-lifting trucks |
| DE1920386A1 (en) * | 1969-04-22 | 1971-05-13 | Steinbock Gmbh | Mast for lifting vehicles, especially for forklifts |
| FR2157706B1 (en) * | 1971-10-27 | 1976-07-23 | Braud & Faucheux | |
| FR2338891A1 (en) * | 1976-01-24 | 1977-08-19 | Ward Plant Spares Henley Ltd | Auxiliary elevating mast for forklift truck - is fitted to main mast elevator bridge and has tie bars across U-shaped channel with carriage running on rollers |
| US4030568A (en) * | 1976-03-24 | 1977-06-21 | Caterpillar Tractor Co. | High visibility mast for lift trucks |
| DE2713808A1 (en) * | 1977-03-29 | 1978-10-05 | Linde Ag | Fork-lift truck lifting equipment - has rams between outermost flanges of H=section stationary columns |
| DE2717168A1 (en) * | 1977-04-19 | 1978-10-26 | Jungheinrich Kg | Fork lift truck mast assembly - has open construction fixed and travelling frames with chain drive and hydraulic cylinder actuators |
| US4219302A (en) * | 1978-02-13 | 1980-08-26 | Towmotor Corporation | Cylinder arrangement for raising a carriage and uprights of a mast |
-
1980
- 1980-03-14 CA CA000347748A patent/CA1141711A/en not_active Expired
- 1980-03-20 FR FR8006249A patent/FR2451884B1/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105851260A (en) * | 2016-06-14 | 2016-08-17 | 重庆恒阳食品有限公司 | Bamboo stick feeding device for automatic bean bar machine |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2451884A1 (en) | 1980-10-17 |
| FR2451884B1 (en) | 1985-07-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |