JP2000318498A - Seat swiveling device for industrial vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a favourable field of view at the time of backing and to eliminate deterioration of depal workability by setting a swiveling center of a seat in front of a bearing surface as well as supporting the seat free to rotate around a shaft vertical with a car body as its swiveling center and adjusting a swiveling attitude position of the seat against the car body. SOLUTION: An operation switch 30 is pressed to a seat swiveling side so as to secure a favourable field of view without taking an immoderate attitude at the time of retreating a vehicle. Therefore, a hydraulic cylinder 20 is contracted as a contact point of one relay 36 is changed over and a motor 31 normally swivels a gear pump 32. Consequently, a swiveling plate swivels by a specified angle θin the clockwise direction around a pin 14 as its swiveling center integrally with the seat 4, and a driver seated in the seat 4 is directed to a diagonally front on the right side. At this time, as the pin 14 is arranged on the front side of a seat cushion 5, it is possible to restrain a foot of the driver from becoming distant from various kinds of pedal arrangements 7-9 on the floor surface side and to facilitate his or her operation even when the driver takes an attitude to face the diagonally front.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat rotation device for an industrial vehicle such as a forklift, and more particularly to a case where a seat is rotated in order to secure a field of view when the forklift moves backward. The present invention relates to a seat rotation device that prevents a decrease in operability of various pedals such as an accelerator pedal.

[0002]

2. Description of the Related Art As is well known, a seat (seat) of a forklift is installed on an engine hood (also referred to as a top panel) facing forward.
Generally, the position of the seat in the front-rear direction can be adjusted so that an optimum driving position can be obtained according to the body shape of the operator.

On the other hand, it is said that the frequency of forward traveling and backward traveling of a forklift is almost 50% due to the specificity of its working form. In many cases, safety is ensured by driving.

However, in the case of the conventional seat, the operator has to twist his / her waist and neck greatly rearward in order to secure the visibility during the backward running, and the operator is greatly fatigued due to the excessive posture.

[0005] To prevent this, a seat rotating device has been attempted in which the seat itself is made to be of a rotary type so as to reduce the burden on the operator from an unreasonable posture. For example, as shown in FIG. General rotary seat 101 having a center of rotation 102 set at the center of the seat surface
In this case, if the operator tilts the body together with the seat 101, the frequently used right foot is separated from the accelerator pedal 103 and the brake pedal 104 upon pedal operation, and the pedal operability tends to deteriorate, which is not preferable. Reference numeral 105 denotes a clutch pedal or an inching pedal.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and in particular, while adopting a rotary seat for improving the visibility during backward running, the pedal operability is not deteriorated. It is an object of the present invention to provide a structure of a seat rotation device that prevents such a problem.

[0007]

According to the first aspect of the present invention, a seat is rotatably supported on a vehicle body about a substantially vertical axis as a center of rotation, and the position of the seat relative to the vehicle body can be adjusted. In addition, the center of rotation of the seat is set forward of the center of the seat.

Therefore, according to the first aspect of the present invention,
Even if the rotation angle of the seat itself is the same as that of the existing rotary seat, the center of rotation of the seat is closer to the various pedal arrangement sides in a plan view of the vehicle. The degree of separation from the array is reduced. Thus, even when the operator rotates the seat and tilts the entire body in order to secure the rear view when the vehicle is traveling backward, for example, the operability of various pedals is not extremely deteriorated, and the operator is forced from an unreasonable posture. Coming fatigue can be reduced.

In this case, even if the rotation center of the seat is extremely forward, the initial purpose cannot be achieved,
As in the invention according to claim 2, the rotation center of the seat is located forward of the seat surface of the seat, more specifically, the rotation center of the seat is located forward of the front edge of the seat surface of the seat. Is most appropriate.

According to a third aspect of the present invention, there is provided a rotary seat according to the first or second aspect of the present invention, further comprising a rotary unit, wherein the rotary unit includes a base plate mounted on a vehicle body, and a base plate. A rotating plate on which a sheet is mounted on an upper surface which is superimposed and arranged so as to be relatively rotatable, and a plate-like sliding pad made of a low friction member is interposed between the two plates. It is characterized by.

[0011] The invention described in claim 4 is the same as the claim 3.
The rotation unit according to the invention described in (1), further includes an actuator for rotating the rotation plate with respect to the base plate.

According to a fifth aspect of the present invention, the actuator according to the fourth aspect of the present invention is characterized in that the actuator is a fluid pressure cylinder arranged in a bridge between the base plate and the rotary plate.

According to a sixth aspect of the present invention, the actuator according to the fourth or fifth aspect is operated by a manual switch operation or a switch operation interlocked with the movement of a forward / reverse switching lever of the vehicle. It is characterized by being.

According to a seventh aspect of the present invention, the rotary unit according to the sixth aspect of the present invention is mounted on a seat slide device for adjusting a position of the seat in the front-rear direction, and on an upper surface of the seat slide device. It is characterized by being provided between the seat and the seat.

Therefore, according to the third aspect of the present invention,
As the configuration of the rotation unit that rotatably supports the sheet, since a configuration in which a plate-shaped sliding pad is interposed between the base plate and the rotation plate that are connected to each other so as to be relatively rotatable, With this alone, the essential functions of the rotary seat can be fully exhibited. At the same time, the thickness of the rotating unit is reduced as much as possible, so that, for example, when applied to an existing sheet having no rotating function, an extreme increase in the hip point does not occur.

In particular, in the invention according to the fourth aspect, since the actuator for rotating the rotary plate with respect to the base plate is provided, the actuator can be easily and automatically operated by a switch or the like as in the invention according to the sixth aspect. In addition, when a hydraulic cylinder such as a hydraulic cylinder or a pneumatic cylinder is used as the actuator, the seat can be rotated more quickly. Power and operating speed can be changed or adjusted relatively easily.

Further, as in the invention according to claim 7,
When the above-described rotating unit is interposed between the seat slide device and the seat, the rotating unit also slides with the seat when adjusting the position of the seat in the front-rear direction, so that the relationship between the operator and the center of rotation of the seat is always constant. It remains constant.

The invention according to claim 8 is the same as the rotation limit position in the normal rotation direction when the seat is rotated clockwise from its neutral position in the invention according to claim 1 or 2. The rotation limit positions in the reverse direction when rotated in the counterclockwise direction from the neutral position are individually set, and the seat is rotatable between the neutral position and the rotation limit position in the normal rotation direction. At the same time, it is rotatable between a neutral position and a rotation limit position in the reverse direction.

Therefore, according to the invention described in claim 8, when the operator rotates the seat in order to secure the rear view when the vehicle is traveling backward, for example, the seat is rotated clockwise (forward direction) from the neutral position. Rotate to tilt the whole body. As a result, the operability of various pedals, which is the intended purpose, does not deteriorate as in the first aspect of the invention. On the other hand, for example, in the case of a forklift, it is preferable to get on and off the vehicle from the left side when the operator gets on and off. In this case, the seat is moved in a counterclockwise direction (reverse direction) from the neutral position prior to the getting on and off operation. Rotate. Thereby, the getting on / off operation can be performed without being conscious of avoiding interference with the steering wheel and various cargo handling operation levers.

According to a ninth aspect of the present invention, the seat rotating device according to the eighth aspect of the present invention includes a rotating unit, and the rotating unit is provided with a base plate mounted on the vehicle body and an overlapping arrangement on the base plate. A rotating plate on which a sheet is mounted is connected to the upper surface so as to be relatively rotatable, and a plate-like sliding pad made of a low friction member is interposed between the two plates.

Therefore, according to the ninth aspect of the present invention, similarly to the third aspect of the present invention, the rotating unit for rotatably supporting the sheet includes a base plate and a rotating unit which are relatively rotatably connected to each other. Since a structure in which a plate-like sliding pad is interposed between the plate and the plate is employed, the function essential to the rotary seat can be sufficiently exhibited only by this. At the same time, the thickness of the rotating unit is reduced as much as possible, so that, for example, when applied to an existing sheet having no rotating function, an extreme increase in the hip point does not occur.

A tenth aspect of the present invention is characterized in that the actuator according to the ninth aspect of the present invention is an electric motor unit disposed in a space between the base plate and the rotary plate. Since this motor unit is interposed between the base plate and the rotary plate, it is desirable to use a type that is as thin as possible.

Therefore, in the invention according to the tenth aspect, an electric motor unit is used as the actuator instead of the hydraulic cylinder or the pneumatic cylinder in the invention according to the fifth aspect. Therefore, the seat can be rotated very easily and automatically by a switch operation or the like, and in particular, a motor unit does not require a fluid pressure source such as a hydraulic power unit.

According to an eleventh aspect of the present invention, the rotary plate of the tenth aspect of the present invention is formed as a substantially flat plate, whereas the base plate has a substantially cross-sectional shape whose central portion is swelled downward. The motor unit is accommodated in a space of the hat-shaped cross section, and a pinion gear provided on an output shaft of the motor unit meshes with a sector ring gear provided on the rotating plate side. It is characterized by having.

Therefore, in the invention according to the eleventh aspect, in order to effectively utilize the space between the seat slide device and the base plate fixed to the movable rail side, the central portion of the base plate is expanded downward. Since the so-called inverted hat-shaped cross-sectional shape is used as a space for the motor unit, the arrangement of the motor unit does not increase the total thickness of the rotating unit. . This allows
For example, even when the rotary seat is applied to an existing seat having no rotation function, an extreme increase in the hip point can be avoided.

According to a twelfth aspect of the present invention, the reinforcing plate for connecting the left and right sides of the substantially hat-shaped cross section to each other is superposed on the base plate according to the eleventh aspect of the present invention. And the sliding pad is arranged in a stack.

Therefore, according to the twelfth aspect of the present invention, the structure can be simplified by positively and effectively using the reinforcing plate attached to the base plate as the receiving surface of the sliding pad in addition to the reinforcing function. Become.

According to a thirteenth aspect of the present invention, in the invention of the twelfth aspect, the rear end of one of the base plate and the rotating plate overlapped with each other is allowed to rotate relative to each other. In addition, a lift preventing means for preventing the rotation plate from rising from the base plate is provided.

In the case where the center of rotation of the rotary plate is simply set to the center of the seat surface of the seat or to the front side of the seat surface as in the first, second, or eighth aspect of the present invention, the operator seats. Depending on the position or the seating posture, there is a concern that the rear portion of the rotary plate may float together with the seat with respect to the base plate. However, in the invention according to the thirteenth aspect, the lift of the rotary plate is ensured while allowing smooth rotation of the rotary plate. Can be prevented.

The invention according to claim 14 is the invention according to claims 8 to 1.
3. A lock for mechanically locking the rotary plate with respect to the base plate at that position when the rotary plate is stopped at the neutral position and an arbitrary rotational position, based on the premise of the invention described in any one of 3. Means are provided.

Therefore, in the invention according to claim 14, when the rotating plate and thus the sheet is stopped at a predetermined position, the locking means always operates to mechanically lock the rotating plate, and the sheet rotates unnecessarily. Prevent it from getting lost.

[0032]

According to the first aspect of the present invention, since the center of rotation of the seat in the rotary seat is set ahead of the center of the seat surface, the operator can secure a rear view when the vehicle is traveling backward. Even if the entire body is tilted by rotating the seat to prevent the operator's feet from moving away from the various pedal arrangements extremely, preventing deterioration in pedal operability and reducing fatigue from the operator's unreasonable posture The effect can be further reduced, especially when the rotation center of the seat is located forward of the seat seat surface as in the second aspect of the invention.

According to the third aspect of the present invention, the rotating unit for rotating the sheet is constituted by the base plate and the rotating plate and the sliding pad interposed therebetween. In addition to the same effect as the invention described in the above, in addition to reducing the rotating operation force with a small number of parts, the thickness of the rotating unit can be small, for example, when applied to existing seats that do not have a rotating function This has the effect that the hip point does not rise.

In particular, when the rotary unit is of an actuator drive type such as a fluid pressure cylinder, the load on the operator required for rotating the seat can be further reduced. There is an advantage that the operating force and the operating speed required for the rotation of the seat can be changed or adjusted relatively easily.

According to the seventh aspect of the present invention, since the rotating unit is disposed between the seat and the seat slide device, a large-scale modification is not required when the present invention is applied to an existing seat having no rotating function. Yes, and even if the seat slide device is used to adjust the position of the seat in the front-rear direction, the relationship between the operator and the center of rotation of the seat remains unchanged because the rotating unit slides with the seat, facilitating optimal driving position There is an effect that can be secured.

According to the eighth aspect of the present invention, the first aspect is provided.
Or, based on the premise of the invention described in 2 above, not only can the sheet be rotated or returned from the neutral position in the forward direction, but also the sheet can be rotated or returned from the neutral position in the reverse direction. Even if the operator rotates the seat in the neutral position or in the normal rotation direction and tilts the entire body, for example, in order to secure the rear view when the vehicle is traveling backward, the operator's feet can be extremely various pedal arrangements. As a result, it is possible not only to reduce the pedal operability but also to reduce the fatigue caused by an unreasonable posture of the operator, as in the case of the first or second aspect of the invention. When the seat is rotated in the reverse direction from the neutral position, assuming the getting on / off operation from the left side when getting on / off From the interference between the steering wheel and various loading operation lever it can be easily avoided when the passenger, there is an effect that can be combined with improved passenger resistance.

According to the ninth aspect of the present invention, the third aspect is provided.
Similarly to the invention described in the above, since the rotation unit for rotating the seat is configured by the base plate and the rotation plate and the sliding pad interposed between them, the same effect as the invention according to the eighth invention is provided. In addition, the rotating operation force can be reduced with a small number of parts, and the thickness of the rotating unit can be reduced, so that when applied to existing seats that do not have a rotating function, for example, the rise of hip points may be caused. There is no effect.

According to the tenth aspect of the present invention, since the electric motor unit disposed in the space between the base plate and the rotary plate is employed as the actuator of the rotary unit, the flat surface of the sheet itself is provided. All the mechanisms including the motor unit can be arranged in a suitable size, which is advantageous in terms of space, as well as requiring a fluid pressure source as in the case of using a fluid pressure cylinder etc. as an actuator. Therefore, it is more advantageous in simplifying the structure, and in particular, there is an effect that it can be easily applied to an existing seat having no rotation function.

According to the eleventh aspect of the present invention, since the base plate has a substantially inverted hat shape in cross section in order to effectively use the space below the base plate, the motor unit is housed in the space having the hat shaped cross section. Also, the thickness of the rotating unit does not increase due to the presence of the motor unit, and the use of the rotating seat does not cause an extreme increase in the hip point. In addition, since the pinion gear on the motor unit side is meshed with the ring sector gear on the rotating plate side, no power transmission member is required in other respects, and the number of parts can be reduced and the structure can be simplified. .

According to the twelfth aspect of the present invention, the base plate is reinforced by the reinforcing plate, and then the sliding pad is supported by the reinforcing plate. In addition to the effects described above, there is no need for a single component for supporting the sliding pad, so that the number of components can be further reduced and the structure can be simplified.

According to the thirteenth aspect of the present invention, the base plate forming the rotary unit or the rear end of the rotary plate is allowed to rotate relative to each other while the rotary plate is prevented from floating from the base plate. Because of the provision of the means, even if the center of rotation of the seat is in the center of the seat surface or in front of the seat surface, even if the center of gravity moves due to a change in the seating posture or seating position of the operator, the rotation plate rises And the smooth rotation of the seat can be maintained for a long period of time.

According to the fourteenth aspect of the present invention, when the rotating plate and, consequently, the sheet is rotated and stopped at a predetermined position, the sheet is mechanically locked at that position by the locking means. This has the effect of reliably preventing operation.

[0043]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 5 show a first embodiment of a seat rotating device according to the present invention applied to a forklift. FIG. 1 is a plan view of the seat rotating device. 2 is an explanatory side view of the entire sheet rotating device,
FIG. 3 is an exploded perspective view of a main part of the seat rotation device. FIG. 4 is an operation explanatory diagram of only the rotary unit, and FIG. 5 is a block circuit diagram of a drive system of the rotary unit. This embodiment corresponds to the first to seventh aspects of the present invention.

As shown in FIGS. 1 and 2, on an upper surface of an engine hood (top panel) 1 forming a part of the body of a forklift, a seat 4 is provided via a seat slide device 2 and a rotating unit 3. It is placed. The seat 4 includes a seat cushion 5 serving as a seat surface and a seat back 6 as is well known. As is well known, in addition to the accelerator pedal 7 and the brake pedal 8, in addition to the accelerator pedal 7 and the brake pedal 8, a clutch pedal or an inching pedal 9 is disposed on the floor surface on the front side of the seat 4.

More specifically, as shown in FIGS. 3 and 4 in addition to FIG. 2, the seat slide device 2 includes a guide rail 10 fixed to the engine hood 1 side, and a guide rail 1
It comprises a slide rail 11 slidable along zero and an operation lever 12, and a rotating unit 3 is fixed to the slide rail 11 side as described later. Although the slide rail 11 is normally locked with respect to the guide rail 10, the operation lever 12
Is pressed or towed to release the locked state, and the position of the seat 4 in the front-rear direction can be arbitrarily adjusted.

The rotary unit 3 is disposed on a base plate 13 to be fixed to the slide rail 11 on the seat slide device 2 side and on the upper surface side of the base plate 13 so as to overlap each other. And a rotating plate 16 rotatably connected to a portion of the base plate 13 through a vertical or substantially vertical pin 14 and a bush 15. The rotary plate 16 is positioned on a top surface of the base plate 13 by a positioning block 17. And a rectangular plate-shaped sliding pad 18 made of a low friction member. Since the sliding pad 18 is interposed between the plates 13 and 16 in this manner, the sliding resistance associated with the relative rotation between the plates 13 and 16 is reduced. The rotating plate 16 has a seat frame 19 on the seat 4 side.
Is fixed by the adapter portion 16a, and as shown in FIGS. 1 and 2, the pin 14 functioning as the center of rotation of the seat 4 is located on the front side of the seat cushion 5 in a plan view of the vehicle. It is set to be located in.

A hydraulic cylinder 20 as an actuator for driving the rotary plate 16 is disposed on one side of the plates 13 and 16 so as to straddle the two. The tube 21 of the hydraulic cylinder 20 is connected to a tube bracket 23 on the base plate 13 side via a pin 22.
On the other hand, the piston rod 24 of the hydraulic cylinder 20 is also connected to a rod bracket 26 on the rotary plate 16 side via a pin 25, and the rotary plate 16 The pin 13 rotates with the pin 14 as the center of rotation. That is, the rotating plate 1
Reference numeral 6 denotes a rotation between a steady posture position P1 in which the seat 4 faces the front as shown in FIGS. 1 and 4 and a rotation limit position P2 rotated by a predetermined angle θ clockwise with respect to the base plate 13. It is possible.

As shown in FIGS. 6 and 7 in addition to FIG.
A bracket 27 is erected and fixed to an end of the rotary plate 16. A hydraulic power unit 28 is fixed to the bracket 27 so as to be covered by a cover 29. An operation switch 30 for extending and retracting the cylinder 20 is provided. The hydraulic power unit 28 includes a motor 31 and a gear pump 32, an oil tank 33, necessary valves, and the like, which are previously unitized as a compact hydraulic package, as shown in the circuits of FIGS. Yes (commonly available). As shown in FIG. 5, in the ignition circuit of the forklift, together with the ignition key switch 34 and the fuse 35, the operation switch 30 and the hydraulic cylinder 20 for contracting operation (for seat rotation) and extending operation (for seat return) are provided. ) Relays 36 and 37 are interposed in series. The operation switch 30 is, for example, a seesaw-type switch that can be pressed in any of the front and rear directions (the sheet rotation direction and the sheet return direction) in FIG. 5, and the hydraulic cylinder is operated only while the switch 30 is pressed. 20 is extended or contracted, and sheet 4 is pin 1
The rotation is made forward or reverse around 4 as a rotation center.

Therefore, according to the present embodiment, as shown by the solid lines in FIGS. 1, 3 and 4B, the base plate 13 and the rotary plate 16 forming the rotary unit 3 are overlapped with each other. In such a relationship, since the hydraulic cylinder 20 is in the most extended state, the seat 4 on the rotary plate 16 is in the steady posture position P1 in which the seat 4 faces directly in front, and the circuit shown in FIG. Unless the operation switch 30 is operated as described above, the hydraulic cylinder 20 is hydraulically locked, so that the seat 4 is held at the steady posture position P1.

On the other hand, when it is desired to secure the rear view without depending on the excessive posture when the vehicle is traveling backward, the operator presses the operation switch 30 to the front side (seat rotation side) in FIG. 5 to hold the state. I do. As a result, the contact of one of the relays 36 in FIG. 5 is switched, and the motor 31 drives the gear pump 32 in the normal rotation.
Operates to contract. With the contraction operation of the hydraulic cylinder 20, the rotating plate 16 rotates clockwise with the seat 4 by a predetermined angle θ about the pin 14 as a rotation center, and the operator sitting on the seat 4 moves obliquely rightward and forward. It becomes a posture that turns.

Note that, as described above, the operation switch 30
Since the sheet 4 rotates only while the button is pressed, the rotation angle θ of the sheet 4 can be arbitrarily adjusted. Further, even if the weight of the operator acts on the seat 4, the sliding pad 1 having a small coefficient of friction is provided between the base plate 13 and the rotating plate 16 which rotate relative to each other.
Because of the interposition of 8, the sliding resistance between the two is reduced, and the seat 4 can be smoothly rotated with a small rotational driving force.

At this time, as is apparent from FIGS.
Since the center of rotation of the seat 4 is set to the front side of the seat cushion 5, even if the operator sitting on the seat 4 is oriented diagonally forward as described above, the operator's feet The degree of movement of the pedals from the various pedal arrangements 7 to 9 on the floor surface side is extremely small, and the operability of these various pedals is not impaired. That is, FIG. 18 shows an example in which the center of rotation 102 of the seat 4 is set at the center of the seat cushion as the seat surface. As is clear from a comparison between FIG. 1 and FIG.
In the present embodiment, the operator's feet have various pedal arrangements 7
It can be seen that the degree of moving away from ９9 significantly decreases.

In order to return the seat 4 to the original normal posture position P1, when the operator presses the operation switch 30 of FIG. 5 rearward (toward the seat return side), the contact of the other relay 37 of FIG. And the motor drives the 31 gear pump 32 in the reverse direction, so that the hydraulic cylinder 20 extends. With the extension operation of the hydraulic cylinder 20, the rotating plate 16 rotates counterclockwise with the seat 4 by a predetermined angle θ around the pin 14 as a center of rotation, and the operator sitting on the seat 4 faces directly in front. It returns to such a steady posture position P1.

As described above, according to the present embodiment, even if the operator rotates the seat 4 on which the operator is seated in order to secure the rear view of the forklift when the vehicle retreats without forcing an unreasonable posture. Accordingly, the degree to which the operator's feet move away from the various pedals 7 to 9 is extremely small, so that the pedal operability can be improved while reducing the operator's fatigue due to an unreasonable posture.

In addition to the rotation unit 3 being interposed between the seat slide device 2 and the seat 4, the sliding resistance between the base plate 13 and the rotation plate 16 in the rotation unit 3 is reduced. Since the plate-like sliding pad 18 is employed as a means for reducing the number of seats, it can be applied to an existing seat having no seat rotation function without major modification, and the total thickness of the rotation unit 3 shown in FIG. The dimension t can be reduced, and the hip point at the time of sitting does not become extremely high even when applied to an existing seat later as described above.

FIG. 9 is a view showing a second preferred embodiment of the seat rotating apparatus according to the present invention, wherein a one-touch switch is used as the operation switch 40, and the switch 40 is used.
The one-touch operation allows the user to rotate and return the sheet 4.

As shown in FIG. 9, the operation switch 40 is a seesaw type switch which can be pressed in any of the front and rear directions (the sheet rotation direction and the sheet return direction) as in the case of FIG. Even if the operating force is released, the contact itself is of a type that can hold its pressed state by itself. The ignition circuit includes relays 4 for hydraulic cylinder contraction operation (for seat rotation operation) and hydraulic cylinder extension operation (for seat return operation).
1, 42 and a relay 4 for stopping the operation of the hydraulic cylinder 20
3 and a switch 44 for detecting that the hydraulic cylinder 20 is at the extension limit position (the steady posture position P1 of the seat = sheet return limit position). A switch 45 for detecting that the position 20 is at the contraction limit position (sheet rotation limit position P2) is additionally provided. Other structures are the same as those of the first embodiment shown in FIG.

Therefore, according to the second embodiment, when the operation switch 40 is one-touched forward (toward the seat rotation side) in a state where the seat 4 is in the steady posture position P1, the relay 41 for hydraulic cylinder contraction operation is operated. Is switched to the ON side and the motor 31 is driven to rotate forward, so that the hydraulic cylinder 20 contracts. As a result, the seat 4 rotates clockwise about the pin 14 by the predetermined angle θ. The rotation of the seat 4 is controlled by an operation switch 40.
Is continued even after the pressing operation force is released, and the hydraulic cylinder 20 reaches the contraction limit position at the same time when the seat 4 reaches the rotation limit position P2. The switch 45 detects this and turns the switch 45 ON. Become. When the switch 45 is turned on, the contact of the relay 43 for stopping the operation of the hydraulic cylinder 20 is turned off, and the relay 41 for contracting the hydraulic cylinder (for rotating the seat) is turned off. The contracting operation, and consequently, the rotation operation of the sheet 4 is stopped, and the sheet 4 is held at the rotation limit position P2.

Conversely, when returning the seat 4 from the rotation limit position P2 to the original steady posture position P1, the operation switch 40 is one-touched to the rear side (sheet return side) in a state where the sheet 4 is at the rotation limit position P2. When operated, the hydraulic cylinder extending operation relay 42 is switched to the ON side, and the motor 31 is driven to rotate in the reverse direction, so that the hydraulic cylinder 20 extends. As a result, the seat 4 starts to rotate counterclockwise around the pin 14 as a rotation center to return to the normal posture position P1. Then, since the hydraulic cylinder 20 reaches the extension operation limit position at the same time when the seat 4 rotates to the normal posture position P1, the switch 44 detects this and the switch 4
4 turns ON. When the switch 44 is turned on, the contact of the relay 43 for stopping the operation of the hydraulic cylinder 20 is turned on.
At the same time, the relay 42 for the hydraulic cylinder extending operation (for returning the seat) is turned off, and as a result, the extending operation of the hydraulic cylinder 20 and consequently the returning operation of the seat 4 are stopped. It will return to position P1.

Also in this embodiment, basically, the first
In addition to the effects similar to those of the embodiment described above, the operability is further improved because the sheet 4 rotates to the rotation limit position P2 at a stroke by one-touch operation. Further, if the operation switch 40 is linked to the movement of the forward / backward switching lever of the forklift (not shown), the seat 4 automatically rotates forward and backward in response to the forward / backward switching without operating the switch. , And the operability is further improved.

FIGS. 10 to 14 show a third preferred embodiment of the seat rotating device according to the present invention.
0 is a plan view of a rotating unit in the sheet rotating device,
FIG. 11 is an exploded perspective view of the base plate constituting the rotating unit, and FIG. 12 is an exploded perspective view of the rotating plate constituting the rotating unit. This embodiment corresponds to the inventions according to claims 8 to 13.

As shown in FIG. 13 in addition to FIGS.
The seat slide device 50 includes a pair of left and right guide rails 51 fixed to the engine hood 1 side, a slide rail 52 slidable along each of the guide rails 51,
The slide rail 52 is normally locked with the guide rail 51 by the lock plate 54, but the operation lever 53 is pushed or pulled. By operating, the locked state is released, and the position of the seat mounted thereon via the rotation unit 55 in the front-rear direction can be arbitrarily adjusted.

As shown in FIGS. 12 and 13 in addition to FIGS.
The bolts 56 and 5 are attached to the pair of right and left slide rails 52 on the 0 side.
7 and a base plate 58 made of a steel plate fixed by a nut corresponding thereto, and a pin 59 and a bushing, which are vertically or almost vertically mounted on the front end of 60 and a rotating plate 6 made of the same steel plate rotatably connected through a washer 61 and a nut 62.
3 and a resin cover 6 formed substantially in the same shape as the rotating plate 63 and placed over the rotating plate 63.
4 as a subject. The rotating plate 63 and the cover 64 are formed as a so-called hollow shape having a central portion punched out, and an opening 58 a is also formed in the central portion of the base plate 58. 1 and 2, the pin 59 functioning as the center of rotation of the seat 4 (rotating plate 63) is positioned forward of the front edge of the seat cushion 5 in a plan view of the vehicle. Is set.

As shown in FIGS. 11 and 13, the base plate 58 is formed to have a substantially inverted hat-shaped cross section when viewed from the front of the vehicle by expanding a central portion thereof downward. A rectangular reinforcing plate 65 is provided on the upper surface so as to straddle the left and right flange portions 58b.
Are fixed to the base plate 58 by welding or the like. A liner 66 as a sliding pad made of a low-friction member having substantially the same shape as the reinforcing plate 65 is disposed on the upper surface of the reinforcing plate 65. Thus, the liner 66 is provided between the base plate 58 and the rotating plate 63. Because 66 is interposed,
The sliding resistance associated with the relative rotation between the plates 58 and 63 is reduced.

Since the heads of the bolts 57 for fixing the entire base plate 58 to the slide rails 52 are exposed on the reinforcing plate 65, the liner placed on the reinforcing plate 65 An escape hole 66 for avoiding interference with the head of the bolt 57
a is formed. That is, the reinforcing plate 65
The position of the liner 66 superposed on the reinforcing plate 65 is determined by the engagement between the head of the bolt 57 and the escape hole 66a.

At the center of the upper surface of the base plate 58, a motor bracket 67 having a substantially hat-shaped cross section is fixed by welding or the like so as to cover a part of the opening 58a, as shown in FIGS. A motor unit 68 as an actuator for driving the rotating plate 63 inserted from below the base plate 58 is fixed to the motor bracket 67 with four bolts 69a.
That is, as is apparent from FIG. 13, the central portion of the base plate 58 is swelled downward so as to fit within the height of the seat slide device 50, and the base plate 5
8 is formed in a so-called inverted hat-shaped cross-section, and the hat-shaped cross-sectional space is used as a space for accommodating the motor unit 68 for driving the rotary plate 63, so that the space efficiency is improved and the seat surface of the seat does not become unnecessarily high. Is considered.

The motor unit 68 has a known structure in which a flat motor body and a speed reduction mechanism are combined as one unit, and is fixed to the output shaft of the motor unit 68 as shown in FIGS. Pinion gear 6
9 project above the motor bracket 67.

On the other hand, as shown in FIG. 12, a pair of right and left adapter plates 70 are fixed to the rotary plate 63 by weld bolts. 2 and the seat frame 19 (see FIG. 2) on the seat 4 side is fixed in the same manner as in FIG.

The rotating plate 63 has a sector ring gear 71 which is curved in a substantially arcuate shape so as to cross the opening 63a thereof and is fixed by bolts 72. Tooth profile 71
a meshes with the pinion gear 69 on the motor unit 68 side. Thus, the rotation plate 63 rotates in the normal direction or the reverse direction about the pin 59 as the rotation center in response to the normal / reverse rotation start of the motor unit 68.

That is, as shown in FIG. 4, the rotating plate 63 has a stationary posture position (neutral position) P1 in which the seat 4 of FIG. 1 mounted thereon faces forward.
The base plate 58 is rotatable between its steady state position P1 and a forward rotation limit position P12 rotated clockwise by θ1 from its steady state position P1. It is also rotatable between the normal position 58 and the rotation limit position P13 in the reverse direction rotated by θ2 in the counterclockwise direction from the steady posture position P1.

A stopper bracket 73 is fixed to the rear lower surface of the rotary plate 63 by welding or the like, and bumper rubbers 74a and 74b are mounted on both side surfaces of the stopper bracket 73, respectively. When the base plate 58 and the rotary plate 63 overlap each other, the stopper bracket 73
In the space of the hat-shaped cross section of the base plate 58 described above.

More specifically, the stopper bracket 7
3 is exposed to the space of the hat-shaped cross section of the base plate 58, so that the inner vertical wall surfaces 58c,
58d (see FIG. 13) is used as a stopper surface that comes into contact with the stopper bracket 73. As described above, when the rotating plate 63 is rotated clockwise, one bumper rubber of the stopper bracket 73 is used. 74a is an inner vertical wall surface 58c on the base plate 58 side.
, The rotating plate 63 is moved to its rotational limit position P.
12 while the rotation plate 63 is rotated in the counterclockwise direction, the other bumper rubber 74b of the stopper bracket 73 is positioned on the opposite inner vertical wall surface 58.
By abutting on d, the position of the rotating plate 63 is restricted to its rotation limit position P13.

As shown in FIGS. 12 and 14, a long slot 75 is formed at the rear end of the rotary plate 63 and has a substantially arcuate shape. , Two stepped bolts 77 are inserted through a spacer 76 to form a weld nut 78 on the base plate 58 side.
(See FIG. 11). These stepped bolts 77 and spacers 76 serve to guide the relative rotation between the base plate 58 and the rotating plate 63 by engaging with the elongated holes 75, and at the same time, in particular, the rotating plate 6
The rear portion 3 functions as lifting prevention means 78 for preventing the rear portion from floating from the base plate 58. In addition, a plurality of embossed portions 79 are formed in bulging portions at required places of the rotating plate 63 in order to secure rigidity of the rotating plate 63 itself.

Further, as shown in FIG. 10 and FIG. 12, a bracket 80 is provided on one side of the rotating plate 63.
The bracket 8 is fixed upright.
0, two push button switches 81 and 82 for starting the motor unit 68 in the normal and reverse directions are provided together with the relays 83 and 84, and these brackets 80
The push buttons 81 and 82 are covered with a switch cover 85 so that only the push button portion is exposed.

As shown in FIG. 5, in the ignition circuit of the forklift, together with the ignition key switch 34 and the fuse 35, the push button switch 81,
82 and each of the relays 83 and 84 are interposed in series. The push button switches 81 and 82 are independent of each other for forward rotation and reverse rotation. For example, the motor plate 68 starts rotating forward while the one push button switch 81 is being pressed, and the rotating plate 63 is rotated. The motor unit 68 starts rotating in the reverse direction only while the other push button switch 82 is being pressed while the pin 59 is rotated in the clockwise direction with the pin 59 as the rotation center, and the rotating plate 63 rotates counterclockwise with the pin 59 as the rotation center. It is designed to rotate.

Therefore, according to the third embodiment, as shown by the solid line in FIG. 10, the base plate 58 and the rotary plate 63 forming the rotary unit 55 are in such a relationship that they completely overlap each other. Sometimes, the seat 4 on the rotary plate 63 is in the neutral position, that is, the steady posture position P1, which faces directly in front, as in FIG. 1, and because of the irreversibility of the rotary power transmission system from the motor unit 68. As long as the push button switches 81 and 82 are not operated, the seat 4 is held at the steady posture position P1.

On the other hand, if it is desired to secure the rear view without depending on the excessive posture when the vehicle is traveling backward, the operator presses the push button switch 81 to hold the state. Thereby, the contact of one of the relays 83 in FIG. 15 is switched, and the motor unit 68 starts rotating forward. As the motor unit 68 starts rotating forward, the rotating plate 6
3 rotates together with the seat 4 by a predetermined angle θ1 in the clockwise direction about the pin 59 as the center of rotation, and the operator seated on the seat 4 assumes a posture obliquely rightward and forward.

As described above, the push button switch 81
Since the sheet 4 rotates together with the rotating plate 63 only while the button 4 is pressed, the rotation angle θ1 of the sheet 4 can be arbitrarily adjusted, and the bumper rubber 74a on the stopper bracket 73 side is connected to the inner vertical wall surface 5 on the base plate 58 side.
When the rotation plate 63 is rotated to the rotation limit position P12 in the normal rotation direction that abuts on the rotation plate 8c, further rotation of the rotation plate 63 is prevented, and the rotation plate 63 is positioned at the rotation limit position P12.

Even if the weight of the operator acts on the seat 4 as in the previous embodiments, the friction coefficient between the base plate 58 and the rotating plate 63, which are to be rotated relative to each other. As a result, since the small liner 66 is interposed, the sliding resistance between the two is reduced, so that the seat 4 can be smoothly rotated with a small rotational driving force. However, the action of the prevention means 78 can reliably prevent the rear portion of the rotary plate 63 from lifting up.

Therefore, similar to the one shown in FIG.
Because the center of rotation of the seat 4 is set on the front side of the seat cushion 5, even if the operator sitting on the seat 4 is oriented diagonally forward as described above, this is not the case. The degree to which the operator's feet move away from the various pedal arrangements 7 to 9 on the floor surface side is extremely small, and the operability of those various pedals is not hindered.

On the other hand, when returning the seat 4 to the original steady posture position P1, when the operator presses the push button switch 82 shown in FIGS. 10 and 12, the other relay shown in FIG. The contact at 84 is switched, and the motor unit 68 starts to rotate in the reverse direction. When the motor unit 68 starts rotating in the reverse direction, the rotating plate 63
At the same time, it rotates counterclockwise about the pin 59 as a rotation center, and returns to the normal posture position P1 where the operator sitting on the seat 4 faces directly in front.

Here, in the above example, in order to secure the rear view of the operator when the forklift moves backward,
This is a case where the seat 4 is rotated clockwise from the normal posture position P1 with the rotation limit position P12 in the normal rotation direction as a limit. If necessary, the seat 4 is rotated with the rotation limit position P13 in the reverse rotation direction as a limit. It is also possible to rotate counterclockwise from P1.

That is, especially in a forklift, it is preferable to get on and off the vehicle from the left side when the operator gets on and off the vehicle. When getting off the vehicle, the seat 4 is rotated counterclockwise by a predetermined angle, and the seat 4 is turned on the left side. When the driver gets off the vehicle at the time when the vehicle is turned obliquely forward, and sits down on the seat 4 waiting at a position rotated by a predetermined angle in the counterclockwise direction when getting on the vehicle,
Is rotated clockwise to return to the normal posture position P1, so that the operator can easily avoid interference with the steering wheel and various cargo handling levers when getting on and off.

The rotation of the seat 4 at this time is nothing but rotation between the normal posture position P1 and the rotation limit position P13 in the reverse rotation direction, and the push-button switches 81 and 82 are alternately operated just like the previous case. The desired purpose can be achieved by performing the pressing operation at the time.

FIGS. 16 and 17 are views showing a fourth preferred embodiment of the seat rotating device according to the present invention. When the rotating plate 85 is stopped at an arbitrary position including the steady posture position P1, the position is determined. And locking means 93 for mechanically locking the rotating plate 85. FIG.
In FIGS. 6 and 17, the same reference numerals are given to parts common to FIGS. 10 to 12 described above. This embodiment corresponds to the invention described in claim 14.

As shown in FIGS. 16 and 17, a locating plate 86 having a substantially L-shaped cross section and curved in a substantially bow shape is integrally fixed to the rear end edge of the rotary plate 85 by welding or the like. A plurality of locating holes 87 are formed through the rig plate 86 at a predetermined pitch. On the other hand, at the rear end of the base plate 58, a locate pin 89 slidably inserted and supported by a bracket 88 is provided, and a solenoid 90, which is a direct-acting actuator, is fixed to the front side of the bracket 88. I have. The actuator 91 of the solenoid 90 is engaged with the locate pin 89, and the locate pin 89 moves forward and backward in accordance with the sliding displacement of the actuator 91. The locate hole 87, the locate pin 89 and the solenoid A lock means 93 is formed by 90 and the like.

That is, when the locate pin 89 is pushed rearward, it is engaged with one of the plurality of locate holes 87 and the rotating plate 8
While the lock 5 is mechanically locked, when the locate pin 89 is pulled forward, the engagement with the locate hole 89 is released, and the lock state is unlocked. The locked and unlocked state by the locate pin 89 is confirmed and detected by a limit switch 92 arranged close to the locate pin 89.

Therefore, according to the present embodiment, when the rotating plate 85 is rotated in the normal rotation direction or the reverse rotation direction by operating the push button switch from the state where the rotation plate 85 is stationary, the unlocking direction of the solenoid 90 is set. For the first time, the motor unit 68 is activated and the rotating plate 85 starts rotating, provided that the locate pin 89 is pulled out from the locate hole 87 by the preceding operation. Conversely, when the pressing force of the push button switch is released and the rotating plate 85 is stopped at an arbitrary position, the solenoid 90 is released at the same time when the pressing force of the operation switch is released.
Is operated in the locking direction, and the operation of the motor unit 68 is stopped on condition that it is confirmed that the locate pin 89 is engaged with any of the locate holes 87. With this configuration, when the rotating plate 85 is stationary, the rotating plate 85
8, the stop position accuracy of the rotating plate 85 and its reliability are improved, and unnecessary rotation of the rotating plate 85 can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first preferred embodiment of a sheet rotating device according to the present invention, and is an explanatory plan view of only a sheet.

FIG. 2 is an explanatory side view of a sheet rotating device in the forklift.

3 is an exploded perspective view of only a rotation unit of the sheet rotation device shown in FIG.

4A and 4B are views showing an assembled state of the rotary unit shown in FIG. 3; FIG. 4A is a perspective view when a seat is in a normal posture position;
(B) is a perspective view when the sheet is rotated.

FIG. 5 is a block circuit diagram of a drive system of the rotary unit shown in FIG. 3;

FIG. 6 is an enlarged view of a main part of FIG. 5;

FIG. 7 is an explanatory side view of FIG. 6;

FIG. 8 is an enlarged view of the hydraulic power unit shown in FIG.

FIG. 9 is a configuration explanatory view showing a second embodiment of the seat rotation device according to the present invention.

FIG. 10 is a view showing a third embodiment of the seat rotating apparatus according to the present invention, and is an explanatory plan view of only a rotating unit.

FIG. 11 is an exploded perspective view showing a relationship between a base plate and a seat slide device in the rotary unit in FIG. 10;

FIG. 12 is an exploded perspective view of the rotating unit in FIG. 10 on the rotating plate side.

FIG. 13 is an explanatory vertical sectional view of FIG. 10;

FIG. 14 is an explanatory vertical sectional view of FIG. 13;

15 is a circuit diagram of a drive system of the motor unit shown in FIG.

FIG. 16 is a view showing a fourth embodiment of the seat rotating apparatus according to the present invention, and is an explanatory plan view of a main part of a rotating unit.

17 is an exploded perspective view showing a relationship between a base plate and a rotary plate forming the rotary unit in FIG. 16;

FIG. 18 is an explanatory plan view showing an example of a conventional sheet rotating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Engine hood 2 ... Seat slide device 3 ... Rotating unit 4 ... Seat 5 ... Seat cushion (seat surface) 13 ... Base plate 14 ... Pin (rotation center) 16 ... Rotating plate 18 ... Slip pad 20 ... Hydraulic cylinder (actuator) 30 ... Operation switch 40 ... Operation switch 50 ... Seat slide device 55 ... Rotating unit 58 ... Base plate 59 ... Pin (center of rotation) 63 ... Rotating plate 65 ... Reinforcement plate 66 ... Liner (sliding pad) 68 ... Motor unit (actuator) 69 ... Pinion gear 71 Sectoring gear 75 Slotted hole 76 Spacer 77 Stepped bolt 78 Floating prevention means 81 Push button switch 82 Push button switch 85 Rotating plate 86 Locating plate 87 Locating hole 89 Locating pin 90: solenoid 93: locking means P1: steady posture position P2: rotation limit position P12: forward rotation limit position P13: reverse rotation limit position

Claims (14)

[Claims] A seat is rotatably supported on a vehicle body with a substantially vertical axis as a center of rotation, so that the rotational position of the seat with respect to the vehicle body can be adjusted, and the center of rotation of the seat is higher than the center of the seat surface. A seat rotation device for an industrial vehicle, wherein the seat rotation device is set on a front side. 2. The seat rotation device for an industrial vehicle according to claim 1, wherein the rotation center of the seat is located forward of a seat surface of the seat in a plan view of the vehicle. 3. A base plate mounted on the vehicle body and a rotating plate superposed on the base plate and having a seat mounted on an upper surface thereof are relatively rotatably connected to each other, and a low friction member is provided between the two plates. 3. The seat rotation device for an industrial vehicle according to claim 1, further comprising a rotation unit having a plate-shaped sliding pad interposed therebetween. 4. The seat rotation device for an industrial vehicle according to claim 3, wherein the rotation unit includes an actuator for rotating the rotation plate with respect to the base plate. 5. The industrial vehicle seat rotation device according to claim 4, wherein the actuator is a fluid pressure cylinder arranged in a bridge between the base plate and the rotation plate. 6. The industrial vehicle according to claim 4, wherein the actuator is operated by a manual switch operation or a switch operation linked to the movement of a forward / reverse switching lever of the vehicle. Seat rotation device. 7. The rotation unit is provided between a seat slide device for adjusting a position of the seat in the front-rear direction and a seat mounted on an upper surface of the seat slide device. The industrial vehicle seat rotation device according to claim 6. 8. The rotation limit position of the seat is the same as the rotation limit position in the normal rotation direction when rotated clockwise from the neutral position, and the rotation in the reverse rotation direction when rotated counterclockwise from the neutral position. The limit positions are individually set, and the seat is rotatable between the neutral position and the rotation limit position in the normal rotation direction, and at the same time, the neutral position and the rotation limit position in the reverse rotation direction are The seat rotation device for an industrial vehicle according to claim 1, wherein the seat rotation device is rotatable between the two. 9. A base plate mounted on the vehicle body and a rotating plate superposed on the base plate and having a seat mounted on an upper surface thereof are relatively rotatably connected to each other, and a low friction member is provided between the two plates. 9. The seat rotation device for an industrial vehicle according to claim 8, further comprising a rotation unit having a plate-shaped sliding pad interposed therebetween. 10. The seat rotation device for an industrial vehicle according to claim 9, wherein the actuator is an electric motor unit arranged in a space between the base plate and the rotation plate. 11. The rotary plate is formed as a substantially flat plate, whereas the base plate is formed as a substantially inverted hat having a central portion swelling downward and having a hat shape. The industrial device according to claim 10, wherein the motor unit is housed in a space of a cross section, and a pinion gear provided on an output shaft of the motor unit meshes with a sector ring gear provided on a rotary plate side. Vehicle seat rotation device. 12. A reinforcing plate for connecting the left and right sides of the substantially hat-shaped cross section to each other on the base plate, and the sliding pad is stacked on the reinforcing plate. Item 12. An industrial vehicle seat rotation device according to item 11. 13. A lifting prevention means for preventing the rotation plate from rising from the base plate while allowing the relative rotation of the base plate and the rotation plate, is provided at the rear end of one of the base plate and the rotation plate which are overlapped with each other. The seat rotation device for an industrial vehicle according to claim 12, wherein the seat rotation device is provided. 14. A locking means for mechanically locking the rotating plate to the base plate at the neutral position and at an arbitrary rotating position when the rotating plate is stopped at the neutral position. Claim 8 to
The industrial vehicle seat rotation device according to any one of claims 13 to 13.