JP2021059144A - Cart - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a trolley capable of a flat trolley form and a non-use storage form with respect to a hand-push type trolley. SOLUTION: A recess (12A) is formed between a rear end wall portion (2b) provided at a rear end portion in a traveling direction (F) of a loading platform body and a load receiving surface (2a), and a recess (12A) is formed from both left and right sides of the recess to the front. Left and right groove portions (12L, 12R) were extended to the left and right ends of the recess, and pivoting mechanisms (16) for pivoting the left and right columns (4L, 4R) were provided and straddled over the pivoting mechanism. Regarding the configuration in which the pivot locking means is provided by the sliding member built in the long casing, the recess is covered with the cover body (50) to form an extended load receiving surface flush with the load receiving surface, and the cover body is formed by a spring. When the left and right columns and the pivoting mechanism, which are urged in the direction of closing the recess and are integrally connected by the lock of the pivoting locking means, are rotated around the lower horizontal axis, the long casing resists the spring. It is configured so that it can be rotated in the opening direction. [Selection diagram] Fig. 1

Description

The present invention relates to a hand-push type trolley, and relates to a trolley configured to enable a hand-push trolley form, a flat trolley form, and a non-use storage form.

The hand-push type trolley for transporting various kinds of luggage is provided on the loading platform body having a loading surface on the upper surface, the left and right front and rear wheels protruding below the loading platform body, and the rear side in the traveling direction of the loading platform body. It consists of a hand pushing means having a pair of left and right struts that are positioned and stand up from the load receiving surface. The hand pushing means is usually formed in a gate shape and is provided with a handle portion erected at the upper ends of the left and right struts. ing.

Therefore, the user can load the load on the load receiving surface, hold the handle portion, push the hand pushing means, and drive the trolley to a predetermined place to carry the load. That is, the dolly is used as a hand-push type dolly.

By the way, in general, the hand pushing means including the left and right columns is pivotally connected so as to be rotatable between an upright posture standing up from the load receiving surface and a sideways posture along the load receiving surface. At the time of use, the purpose is to make it possible to store it in a compact folded state by placing the hand pushing means in a sideways posture.

At this time, if the left and right columns of the hand pushing means in the sideways posture are fitted into the groove of the load receiving surface and immersed in the load receiving surface, the loading of the load on the load receiving surface is not hindered. It can also be used as a car.

However, since the wheels of such a dolly cannot be folded and stored from the state of being a flat dolly, the wheels are held in a state of protruding downward even when stored without being used. , There is a problem of being bulky.

For this reason, the applicant has just proposed a trolley in which the wheels can be folded so as not to be bulky during non-use storage (Patent Document 1).

According to this, it is configured to enable two actions when the left and right columns of the hand pushing means are changed from the standing posture to the sideways posture.

The first action is to unlock the pivotal locking means provided in the pivoting mechanism of the strut, and in that state, if only the strut is rotated from the standing posture to the sideways posture, the wheels are left in the protruding posture. , Flat trolley form is provided.

The second action is to maintain the lock of the pivot locking means provided in the pivot mechanism of the strut, and if the strut is rotated from the standing posture to the sideways posture in that state, the pivot mechanism is rotated together with the strut. The wheels are folded into a retracted posture by an interlocking drive mechanism interlocked with the pivoting mechanism, and a non-use storage mode is provided.

Japanese Patent No. 6122058

The trolley of Patent Document 1 proposed by the present applicant has recesses formed between the rear end wall portion provided at the rear end portion in the traveling direction of the loading platform body and the load receiving surface, and is arranged at the left and right ends of the recessed portion. The left and right struts are erected from the provided pivoting mechanism, and the left and right struts are tilted forward toward the left and right grooves via the pivoting mechanism so as to be in a sideways posture.

At this time, a long casing of the pivot lock means is straddled between the left and right pivot mechanisms inside the recess, and when the form is changed between the hand cart form and the flat carriage form. By unlocking the pivot locking means, only the left and right columns are rotated between the standing posture and the sideways posture.

However, when changing the form between the push cart form and the unused storage form, the left and right columns and the pivot mechanism should be rotated while being locked while the pivot locking means is locked. At this time, the long casing of the pivot locking means straddling the pivot mechanism is moved between the rear end wall portion of the loading platform main body and the receiving surface inside the recess.

Since a considerable amount of strength is required to change the posture of the wheel unit, the user supports the loading platform body with one hand and holds the handle part with the other hand to hold the left and right columns. It is strongly rotated from one of the standing posture and the lying posture toward the other.

Therefore, when the user's fingers supporting the loading platform body face the recess, the long casing of the pivot locking means that moves between the rear end wall and the load receiving surface inside the recess is used for finger packing. There is a risk of inviting and injuring your fingertips.

Further, since various mechanisms for the left and right columns are provided, it is necessary to form a recess, so that there is a problem that the receiving area is sacrificed by the recess.

The present invention provides a trolley that solves the above problems, and the means is provided with a load receiving surface on the upper surface and between the rear end wall portion and the load receiving surface provided at the rear end portion in the traveling direction. The loading platform body has recesses formed in the recesses, and the left and right grooves extend forward from both the left and right sides of the recesses, the standing posture of standing up from the left and right ends of the recesses, and the sideways posture of being tilted forward toward the left and right grooves. A hand-pushing means equipped with left and right struts that can change the posture, a pivoting mechanism that rotatably pivots the left and right struts around the upper horizontal axis inside the recess, and a pivot inside the recess. When locked via a sliding member built into a long casing straddled between the connecting mechanisms, the left and right columns are non-rotatably integrally connected to the pivoting mechanism, and when unlocked, the pivoting mechanism A rotatable pivot locking means, left and right wheel units whose postures can be changed between a protruding posture protruding downward from the loading platform body and a stored storage posture, and the pivot mechanism and the left and right wheel units. The left and right wheel units, which are provided in between and are integrally connected by locking the pivot locking means, are rotatably pivoted around the lower horizontal axis and the left and right wheel units are connected by the rotation. It is a trolley provided with an interlocking drive mechanism that changes the posture of the vehicle. A cover body is provided to cover the area between the left and right columns in a sideways posture, and the cover body is almost in contact with the load receiving surface by contacting the step portion formed on the load receiving surface with the free rotation end. An extended load receiving surface that is flush with each other is formed, and the left and right columns are always urged by a spring in a direction in which the free-rotating end portion is brought into contact with the receiving portion, and are integrally connected by the lock of the pivot locking means. When the pivot mechanism is rotated around the lower horizontal axis, the cover body is configured to be rotated in the opening / closing direction against the spring by the long casing.

It is preferable that a notch is provided at the edge of at least one of both ends of the cover body, and an operation portion is formed adjacent to the notch.

In a preferred embodiment of the present invention, the sideways locking means is provided in the recessed portion formed on the load receiving surface of the loading platform body, and the sideways locking means is a rod that is slidable toward at least one of the left and right grooves. The left and right columns of the hand pushing means are composed of a spring that elastically urges the tip lock portion of the rod to protrude into the groove and an unlocking operating means that slides the rod against the spring. A lock hole is provided in the tip lock portion to be locked when the vehicle is in a sideways posture.

According to the present invention, with respect to a trolley that enables a push trolley form, a flat trolley form, and a non-use storage form, a rear end wall portion 2b and a load receiving surface 2a provided at the rear end portion of the traveling direction F of the loading platform body 2 A pivot mechanism 16 and 16 for forming recesses 12A between the recesses, extending left and right groove portions 12L and 12R forward from the left and right sides of the recesses, and pivoting the left and right columns 4L and 4R to the left and right ends of the recess 12A. In addition to the configuration in which the pivot locking means 35 is provided by the sliding member 40 built in the long casing 42 straddling the pivot mechanisms 16 and 16, the recess 12A is covered with the cover body 50, and the cover body Since the extension receiving surface 50d flush with the receiving surface 2a is formed by the 50, it is possible to provide a carriage in which the loadable area of the load is widened.

By the way, in the trolley that enables such three forms, when the columns 4L and 4R are rotated between the standing posture P1 and the sideways posture P2, the user's hand trolley form M1 and the flat trolley form M2 are used by the user. Light strength is sufficient, but the user's strong strength is required to change the posture of the wheel units 3L and 3R by the interlocking drive mechanism 23 between the hand cart form M1 and the unused storage form M3, and one hand is required. It supports the loading platform body and holds the handle with the other hand. However, at this time, if the user's fingers face the recess 12A, there is a risk that the long casing 42 of the pivot locking means 35 that moves inside the recess will clog the fingers and cause injury.

In this regard, according to the present invention, since the cover body 50 is provided so that the user's fingers do not enter the recess 12A, injuries due to finger stuffing can be suitably prevented.

The region of the recesses 12A from the pivotal mechanisms 16 and 16 toward the left and right groove portions 12L and 12R needs to be open in order to enable the sideways posture P2, and thus can be covered by the cover body 50. However, if the user's fingers are inserted in this area, there is a risk of finger stuffing injury, but according to the present invention, the cover body 50 is opened and closed in conjunction with the rotation of the columns 4L and 4R. This has the effect of giving a warning of finger stuffing caution to the user.

It is a perspective view which shows the state which made the trolley which concerns on 1 Embodiment of this invention into a push trolley form. It is a top view of the state where the cover body was removed from the concave part of the loading platform main body which was in the form of a hand truck. It is a top view of the state where the cover body is attached to the concave part of the loading platform main body which was in the form of a push cart. It is a perspective view which shows the state which made the trolley which concerns on 1 Embodiment of this invention into a flat trolley form. It is a top view of the trolley in the form of a flat trolley. It is a top view which shows the sideways locking means when it was made into a flat trolley form. The trolley according to one embodiment of the present invention is shown in a non-use storage mode, (A) is a perspective view showing the upper side of the trolley, and (B) is a perspective view showing the lower side of the trolley. It is a top view of the trolley which was made into an unused storage form. It is a top view which shows the sideways locking means in the non-use storage form. It is a perspective view which shows the left-right column of a hand pushing means, a pivoting mechanism, and a pivoting locking means in an disassembled state. It is a partially enlarged view of FIG. It is a perspective view which shows the left-right column of a hand push means, the pivot mechanism, the pivot lock means, the bearing of the left-right wheel unit, and the interlocking drive mechanism in the assembled state by the cross section. It is a perspective view which shows the pivot mechanism, the interlocking drive mechanism, the left-right wheel unit, and the interlocking lock means assembled to the left-right column of a hand push means in an disassembled state. It is a partially enlarged view of FIG. A state in which the interlocking locking means is locked and the pivot locking means is unlocked with respect to the operation of the pivoting mechanism is shown, (A) is a perspective view shown by a cross section, and (B) is a side view. It is a side view which shows the operation method for unlocking a pivot lock means. From the state of FIG. 15, the support of the hand pushing means is rotated around the upper horizontal axis with respect to the pivot member, the hand pushing means is put into a sideways posture, and the wheel unit is put into a protruding posture, so that the bogie is a flat bogie. It is a side view which shows the state in the form. A state in which the interlocking locking means is unlocked and the pivot locking means is locked with respect to the operation of the pivoting mechanism, (A) is a perspective view shown by a cross section, and (B) is a side view. It is a side view which shows the action when the pivot mechanism integrated with the left and right columns of a hand pushing means is rotated around a lower horizontal axis. From the state shown in FIG. 18, the pivot member is rotated around the lower horizontal axis together with the support of the hand pushing means, the hand pushing means is put into a sideways posture, and the wheel unit is put into a retracted posture so that the dolly is not used. It is a side view which shows the state.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Overall composition)
As shown in FIG. 1, the trolley 1 includes a substantially rectangular board-shaped loading platform body 2 having a loading surface 2a on the upper surface, left and right wheel units 3L and 3R protruding downward from the loading platform body 2, and the loading platform body. It is composed of a pair of left and right columns 4L and 4Rs that stand up on the rear side of the traveling direction F of 2, and the hand pushing means 6 is formed in a portal shape and the left and right columns 4L. A handle portion 5 erected on the upper end portion of the 4R is provided.

As shown in FIG. 1 (B), the loading platform main body 2 forms recesses 12A between the rear end wall portion 2b provided at the rear end portion in the traveling direction F and the load receiving surface 2a, and the left and right sides of the recess 12A are formed. The left and right groove portions 12L and 12R are extended from both sides to the front, and a groove-shaped recessed portion 12B communicating with the left and right groove portions 12L and 12R is formed across a portion slightly forward of the center of the load receiving surface 2a. ing.

As shown in FIGS. 1A and 1B, a cover body 50 is provided in the recess 12A, and a sideways locking means 60 is installed in the recess 12B.

The hand pushing means 6 is fitted into the left and right struts 4L and 4R in an upright posture P1 and the left and right groove portions 12L and 12R by means of pivoting mechanisms 16 and 16 arranged at both left and right ends of the recess 12A. It is configured to be rotatable between the tilted postures P2.

Therefore, as shown in FIG. 3, the cover body 50 is configured to cover the region between the inside of the left and right pivot mechanism 16 and 16 and the load receiving surface 2a in the region of the recess 12A. At this time, notches 50a and 50a are formed at the edges of both end portions of the cover body 50, whereby the front portion of the notch portion 50a constitutes the operation portion 50b and the rear portion is the pivoting mechanism 16. It constitutes a tongue piece 50c close to the tongue piece 50c.

As shown in FIG. 16, the cover body 50 reaches the load receiving surface 2a from the pivot portion 50d pivotally connected to the stepped support portion 2c inside the rear end wall portion 2b of the loading platform main body 2 via the hinge means 51. The recess 12A can be opened and closed by extending and rotating with the hinge means 51 as a fulcrum.

The freely rotatable end portion 50e of the cover body 50 covers the recess 12A by abutting on the receiving step portion 2d formed on the receiving surface 2a, and in that state, the upper surface of the cover body 50 is substantially flush with the receiving surface 2a. The surface 50f is formed, and the free end portion 50e is always urged in the direction of being brought into contact with the receiving portion 2d by the spring 52 provided in the hinge means 51.

As shown in FIGS. 1, 4 and 7, the left and right wheel units 3L and 3R are located at both ends of a frame 7 located on the lower left and right sides of the loading platform main body 2 and arranged in the traveling direction F, respectively. A unit in which the front wheels 8 and the rear wheels 9 are vertically installed is formed, and the bearings 10 and 10 fixed to the frame 7 are supported by a support shaft 11 parallel to the frame 7 fixed to the bottom of the loading platform body 2. doing. Therefore, the left and right wheel units 3L and 3R are rotatable around the axis of the support shaft 11, and along the protruding posture Q1 in which the front and rear wheels 8 and 9 are projected from the bottom of the loading platform body 2 and the bottom of the loading platform body 2. It is configured to be rotatable between the stored postures Q2.

(Bogie form)
FIG. 1 shows a state in which the carriage 1 is in the hand truck form M1, the hand pushing means 6 is in an upright posture P1 in which the left and right columns 4L and 4R are upright, and the left and right wheel units 3L and 3R are projected. It is said to be posture Q1. Therefore, the user can load the load on the load receiving surface 2a, hold the handle portion 5, push the hand pushing means 6, and drive the trolley 1 to a predetermined place to carry the load. That is, in this case, the trolley 1 can be used as a hand-push type trolley.

FIG. 4 shows a state in which the bogie 1 is in the flat bogie form M2, and the hand pushing means 6 is in a sideways posture P2 in which the left and right columns 4L and 4R are rotated toward the load receiving surface 2a, and the left and right wheel units. The 3L and 3R have the protruding posture Q1. At this time, the left and right columns 4L and 4R are fitted into the left and right groove portions 12L and 12R recessed in the load receiving surface 2a, and the handle portion 5 is recessed in the load receiving surface 2a so as to communicate the left and right groove portions 12L and 12R. It is fitted in the cross groove portion 13. Therefore, the user can load the load on the load receiving surface 2a in which the hand pushing means 6 is stored in the sideways posture P2, and carry the load by traveling the loading platform main body 2 to a predetermined place. That is, in this case, the trolley 1 can be used as a flat trolley.

FIG. 7 shows a state in which the trolley 1 is in the unused storage mode M3, and the hand pushing means 6 is in a sideways posture P2 in which the left and right columns 4L and 4R are rotated toward the load receiving surface 2a, and the left and right wheels are used. The units 3L and 3R are in the retracted posture Q2. At this time, the left and right columns 4L and 4R are fitted into the left and right groove portions 12L and 12R, and the handle portion 5 is formed so as to be located at the front end of the load receiving surface 2a in the traveling direction F and to communicate the left and right groove portions 12L and 12R. It is stored in the receiving space portion 14. In the case of the illustrated embodiment, as shown in FIG. 12, the receiving space portion 14 is formed by the space above the eaves portion 15 formed on the lower edge of the front end of the loading platform main body 2. The receiving space portion 14 may be formed by an external space opened on the wall surface at the front end of the loading platform main body 2.

(Side lock means)
As shown in FIGS. 6 and 9, the sideways locking means 60 incorporated in the recessed portion 12B of the load receiving body 2 includes left and right rods 61L and 61R that are slidable toward the left and right groove portions 12L and 12R, and the rods. A spring 62 that elastically urges the lock portions 61a at the tips of the 61L and 61R to protrude into the left and right groove portions 12L and 12R, respectively, and a release operating means 63 that slides the rods 61L and 61R against the spring 62. It is configured.

In the case of the illustrated embodiment, the lateral locking means 60 includes a compression spring 62 and rods 61L and 61R in a casing 64 fitted in the recessed portion 12B, and the lock portion 61a is projected from both ends of the casing 64 to project the casing 64. The unit is provided with the release operating means 63 for sliding the rods 61L and 61R from the outside through the elongated holes of the above.

On the other hand, the recessed portion 12B is provided with a hole 65 communicating with the left and right groove portions 12L and 12R, and an expansion recessed portion 12S of the recessed portion 12B is formed between the left and right holes 65 and 65.

Therefore, in the sideways locking means 60 constituting the unit, the casing 64 is fitted into the recessed portion 12B while the rod portion 61a of the rod is inserted into the hole 65, and the releasing operating means 63 is arranged in the expansion recess 12S.

When the columns 4L and 4R of the hand pushing means 6 are placed in the groove portions 12L and 12R in the sideways posture P2, the peripheral surfaces of the columns 4L and 4R having a circular cross section push the lock portions 61a and 61a to push the rods. The 61L and 61R are slid against the spring 62.

As will be described later, the columns 4L and 4R are lateral when they are in the sideways posture P2 to be in the flat cart form M2 and when they are in the sideways posture P2 in order to be in the unused storage form M3. A first lock hole 66 (see FIG. 6) and a second lock hole 67 (see FIG. 9) that are locked by inserting the lock portions 61a and 61a of the tilt locking means 60 are provided.

Therefore, when the first lock hole 66 or the second lock hole 67 is faced while being pushed by the peripheral surfaces of the columns 4L and 4R, the lock portions 61a and 61a are immediately inserted into the lock hole by the spring 62. Then, the columns 4L and 4R are locked so as not to escape from the left and right groove portions 12L and 12R.

From this state, in order to bring the columns 4L and 4R into the standing posture P1, the release operation means 63 is operated by the user's finger inserted into the expansion recess 12S, and the rods 61L and 61R are slid to slide the lock portions 61a and 61a. The lock may be released by retracting from the first lock hole 66 or the second lock hole 67, and the columns 4L and 4R may escape from the left and right groove portions 12L and 12R.

In the illustrated embodiment, the left and right rods 61L and 61R are configured to lock and lock the columns 4L and 4R, respectively, but one of the rods 61 locks and locks one of the columns 4. It may be configured to do so.

(Pivot connection mechanism)
In order to enable the push cart form M1, the flat cart form M2, and the unused storage form M3, a pivot mechanism 16 is provided between the left and right wheel units 3L and 3R and the left and right columns 4L and 4R, respectively. It is provided. In the following, it should be understood that when the left and right wheel units 3L and 3R are not related to the left and right, they are simply referred to as "wheel units 3", and when the left and right columns 4L and 4R are not related to the left and right, they are simply referred to as "support 4". ..

As shown in FIGS. 10 to 14, the pivoting mechanism 16 extends upward from the first arm 17 extending in the traveling direction F and upward from the first arm 17 in a state where the support column 4 is in the standing posture P1. It is composed of a pivoting member 19 having a second arm 18, and the tip of the first arm 17 is rotatably pivoted by a lower horizontal shaft 20 arranged in the left-right direction of the loading platform main body 2. The upper end of the second arm 18 is rotatably and pivotally connected to a rotating member 21 fixed to the lower end of the support column 4 by an upper horizontal shaft 22.

(1st arm and wheel unit)
As shown in FIGS. 13 and 14, an interlocking drive mechanism 23 is provided between the first arm 17 and the wheel unit 3, and the interlocking drive mechanism 23 has the first arm 17 as a lower horizontal axis. When rotated around 20, the wheel unit 3 is configured to rotate between the protruding posture Q1 and the retracted posture Q2. In the case of the illustrated embodiment, the interlocking drive mechanism 23 faces the drive gear 24 provided at the tip of the first arm 17 and the drive gear 24 so as to be arranged concentrically with the lower horizontal shaft 20. It is composed of a driven gear 25 provided on the bearing 10 of the wheel unit 3 so as to be arranged concentrically with the support shaft 11, and as shown by an arrow in FIG. 14, the lower horizontal shaft 20 is formed around the lower horizontal shaft 20. When the 1 arm 17 is rotated in the upward direction R1 (the direction in which the support column 4 is directed from the standing posture P1 to the sideways posture P2), the direction in which the wheel unit 3 is directed from the protruding posture Q1 to the retracted posture Q2 around the support shaft 11. The drive gear 24 and the driven gear 25 are meshed with each other so as to be rotated by R2. When the drive gear 24 is rotated in the direction opposite to the direction R1, the driven gear 25 is rotated in the direction opposite to the direction R2.

At this time, an interlocking lock means 26 facing the pivot member 19 is provided, and it is possible to select an unlock that makes the first arm 17 rotatable around the lower horizontal axis 20 and a lock that makes the first arm 17 non-rotatable. It is configured to do. The interlocking locking means 26 is composed of a locking recess 27 provided at the tail end of the first arm 17 and a locking projection 28 that can be fitted and removed from the locking recess 27, and is behind the loading platform main body 2. The locking projection 28 is formed by a locking tool 29 supported on the inside of the end portion so as to be able to advance and retreat, and the locking projection 29 is moved in the forward direction (locking projection 28 by a spring (not shown) via a rod 30. It is elastically urged in the direction of locking in the locking recess 27).

In the case of the illustrated embodiment, a pair of left and right locking members 29, 29 are arranged facing the pair of left and right pivot members 19 and 19 provided between the lower ends of the left and right columns 4L and 4R and the left and right wheel units 3L and 3R. The pair of left and right locking tools 29, 29 are connected by an operation bar 31.

Therefore, when the user pulls the operation bar 31, the pair of left and right locking tools 29, 29 move in the backward direction against the spring, disengage the locking projection 28 from the locking recess 27, and the interlocking locking means. The 26 is unlocked, and the first arm 17 is rotatable in the rotation direction R1. Then, when the first arm 17 rotated in the direction R1 is reversed toward the original horizontal posture, the locking tool 29 is elastically urged in the forward direction by the spring, so that the locking projection 28 is automatically locked in the locking recess 27, the interlocking locking means 26 is locked, and the first arm 17 is non-rotatably locked.

(2nd arm and support)
As shown in FIGS. 11 to 13, the second arm 18 of the pivot member 19 forms the upper horizontal axis 22 by the boss 32 projecting from the side surface, and is superposed on the side surface of the second arm 18. The rotating member 21 of the support column 4 is rotatably supported by the boss 32, and is fixed by a fastener 33 such as a bolt or nut. Therefore, as a result, the support column 4 is made rotatable between the standing posture P1 and the sideways posture P2 via the rotation of the rotating member 21. In the illustrated embodiment, when the support column 4 is rotated from the sideways posture P2 to the standing posture P1, the stoppers 34a and 34b that hold the standing posture P1 by contacting each other are pivotally attached to the rotating member 21. It is provided between the connecting members 19.

At this time, with the support column 4 in the upright posture P1, the pivot locking means 35 for engaging and disengaging the rotating member 21 with the second arm 18 is provided, and the rotating member 21 is placed above the rotating member 21. It is configured so that an unlock that makes it rotatable around the horizontal axis 22 and a lock that makes it non-rotatable can be selected.

In the case of the illustrated embodiment, the pivot locking means 35 communicates with each other when the support column 4 is in the standing posture P1 between the rotating member 21 and the second arm 18 which are overlapped with each other around the boss 32. It is composed of locking recesses 36a and 36b and locking projections 37 that are removably inserted into both locking recesses 36a and 36b.

In the case of the illustrated embodiment, the pair of left and right pivot members 19 and 19 are arranged facing the pair of left and right rotating members 21 and 21 provided at the lower ends of the left and right columns 4L and 4R. The operating means 38 is arranged between the second arms 18 and 18 of the left and right pivot members 19 and 19, and the slider 39 provided with the locking projections 37 at both ends of the operating means 38. Is provided.

The operating means 38 is provided with a pair of sliding members 40, 40 that support a pair of left and right sliders 39, 39, respectively, and the sliding members 40, 40 are elastically urged by a spring 41 in a direction away from each other. It is configured to be housed in a long casing 42, and the locking projections 37 of the sliders 39 and 39 are projected from both ends of the casing 42 and inserted into the locking recesses 36a and 36b. At this time, the sliding members 40, 40 are provided with operation pieces 43, 43 composed of picking pieces that project to the outside through a long hole (not shown) of the casing 42.

Therefore, when the user moves the pair of operation pieces 43, 43 in the directions close to each other against the spring 41, the sliders 39, 39 accompany the sliding members 40, 40, and the locking projection 37 is moved. The rotating member 21 is disengaged from the locking recess 36a, the pivot locking means 35 is unlocked, and the support column 4 is configured to be rotatable from the standing posture P1 to the sideways posture P2. On the contrary, when the support column 4 is rotated from the sideways posture P2 to the standing posture P1 and the locking recesses 36a and 36b are in contact with each other and communicate with each other, the support is elastically urged by the spring 41. The slider 39 automatically locks the locking projection 37 with the locking recess 36a, locks the pivot locking means 35, and locks the rotating member 21 of the column 4 in a non-rotatable manner.

(Hand truck form)
When the trolley 1 is in the hand-push trolley form M1 as shown in FIG. 1, the pivoting mechanism 16 is made immovable by locking the interlocking locking means 26 with the first arm 17 of the pivoting member 19 in a horizontal state. It is locked so that it cannot rotate by locking the pivot locking means 35 with the second arm 18 in an upright state. In this state, the left and right wheel units 3L and 3R hold the protruding posture Q1 protruding downward from the bottom of the loading platform main body 2, and the left and right columns 4L and 4R of the hand pushing means 6 hold the standing posture P1 standing up from the load receiving surface 2a. doing.

(Flat trolley form)
When the carriage 1 has a flat carriage form M2 as shown in FIG. 4, as shown in FIG. 15, the interlocking locking means 26 is locked, and the first arm 17 of the pivot member 19 is locked so as not to rotate. In this state, the pivot locking means 35 is unlocked so that the rotating member 21 of the support column 4 can rotate around the upper horizontal axis 22 with respect to the second arm 18 of the pivot member 19. Therefore, when the hand pushing means 6 is tilted from the standing posture P1 to the sideways posture P2 from this state, as shown in FIG. 16, the rotating member 21 of the support column 4 is tilted with respect to the pivot member 19 in the fixed state. Is rotated around the upper horizontal shaft 22, so that the support column 4 is fitted into the groove portion 12 and the handle portion 5 is fitted into the cross groove portion 13.

The pivotal locking means 35 is unlocked via the sliding members 40, 40 built in the long casing 42 straddled between the left and right pivoting mechanisms 16, 16, specifically, the casing 42. It is necessary to slide the sliding member 40 by operating the operation piece 43 arranged on the outside of the. Therefore, such an operation is performed by rotating the cover body 50 in the opening direction and inserting the user's finger into the recess 12A, as shown by the chain line in FIG. When the cover body 50 is opened, the user's fingers can be hung on the operation unit 50b (see FIG. 3).

In the sideways posture P2, as shown in FIG. 6, the lock portion 61a of the sideways locking means 60 is locked in the first lock hole 66, and the columns 4L and 4R are locked in the sideways posture P2.

As shown in FIG. 4, since the left and right columns 4L and 4R of the hand pushing means 6 and the handle portion 5 are immersed in the load receiving surface 2a, the load can be freely loaded on the load receiving surface 2a. At this time, since the cover body 50 forms the extended load receiving surface 50d flush with the load receiving surface 2a, the load can be loaded in a wide range.

Since the left and right wheel units 3L and 3R hold the protruding posture Q1 protruding downward from the bottom of the loading platform main body 2, the carriage 1 can be driven.

If the left and right columns 4L and 4R are set to the standing posture P1 by lifting the handle portion 5 of the hand pushing means 6 from the state of the flat trolley form M2, the pivot locking means 35 automatically locks and the trolley 1 is locked. The above-mentioned push cart form M1 is used.

(Non-use storage form)
When the carriage 1 is in the unused storage form M3 as shown in FIG. 7, as shown in FIG. 18, the pivot locking means 35 is locked, and the rotating member 21 of the support column 4 is the second arm of the pivot member 19. In the state of being non-rotatably locked to 18, the interlocking locking means 26 is unlocked so that the first arm 17 of the pivot member 19 can rotate around the lower horizontal axis 20. Therefore, when the hand pushing means 6 is tilted from the standing posture P1 to the sideways posture P2 from this state, as shown in FIG. 20, the rotating member 21 of the support column 4 and the pivot member 19 as a whole are lowered in an integrated state. It is rotated around the horizontal shaft 20, the support column 4 is fitted into the groove portion 12, and the handle portion 5 is housed in the receiving space portion 14. At the same time, the rotation of the first arm 17 changes the posture of the left and right wheel units 3L and 3R from the protruding posture Q1 to the retracted posture Q2 via the interlocking drive mechanism 23.

When the rotating member 21 of the support column 4 and the pivot member 19 as a whole are rotated around the lower horizontal shaft 20 in an integrated state, as shown in FIG. 19, the sliding members 40 and 40 are installed on the left and right sides. The long casing 42 straddled between the pivoting mechanisms 16 and 16 is integrally rotated, and the rotation locus around the lower horizontal axis 20 passes above the recess 12A, so that the hinge The cover body 50 is pushed up against the spring 52 of the means 51.

Since the recess 12A is always covered by the cover body 50, the user's fingers are prevented from entering the recess 12A, and therefore the user's fingers are stuffed and injured by the rotating long casing 42. There is no such thing.

However, of the recesses 12A, the regions from the pivotal mechanisms 16 and 16 toward the left and right groove portions 12L and 12R need to be open in order to enable the sideways posture P2, and cannot be covered by the cover body 50. , There is a risk of finger stuffing injury when the user's fingers are inserted in this area.

Therefore, when the support column 4 requires particularly strong strength, that is, the support column 4 is rotated between the standing posture P1 in the push cart form M1 and the sideways posture P2 in the unused storage form M3. At that time, it is desirable to give a warning of finger stuffing caution to the user who is working by causing the cover body 50 to open and close in conjunction with it, and as a means for that, the pivoting mechanisms 16 and 16 The long casing 42 straddled between them can be effectively used.

As shown in FIG. 9, the lock portion 61a of the sideways locking means 60 is locked in the second lock hole 67 in the state where the sideways posture P2 is set in order to obtain the unused storage form M3, and the columns 4L and 4R Is locked as the sideways posture P2.

The left and right columns 4L and 4R and the handle portion 5 of the hand pushing means 6 are immersed in the load receiving surface 2a, and the left and right wheel units 3L and 3R hold the retracted posture Q2, so that the carriage 1 is in a compact state. Can be stored.

If the left and right columns 4L and 4R are set to the standing posture P1 by lifting the handle portion 5 of the hand pushing means 6 from the state of the unused storage form M3, the first arm 17 of the pivot member 19 rotates. The left and right wheel units 3L and 3R are changed from the retracted posture Q2 to the protruding posture Q1 via the interlocking drive mechanism 23, and the interlocking locking means 26 is automatically locked to lock the trolley 1 to the above-mentioned hand trolley. Form M1. Also at this time, the cover body 50 is pushed up against the spring 52 of the hinge means 51 by the long casing 42.

(Position sideways posture)
As shown in FIGS. 17 and 20, the pivoting mechanism 16 has a lower horizontal axis 20 and an upper horizontal axis 22 with respect to the traveling direction F of the loading platform main body 2 in a state where the support column 4 of the hand pushing means 6 is in the standing posture P1. The distance L1 between the axes of the two axes and the distance L2 between the axes of the lower horizontal axis 20 and the upper horizontal axis 22 in the upward direction are set to L1 = L2. As a result, the support column 4 has a sideways posture P2 to form the flat cart form M2 shown in FIG. 17 and a sideways posture P2 to form the unused storage form M3 shown in FIG. In any of the above cases, since the axis of the support column 4 is tilted so as to be located at the same height H, it is possible to store the support column 4 along the bottom portion of the groove portion 12.

Further, the cross groove portion 13 and the receiving space portion 14 for accommodating the handle portion 5 when the hand pushing means 6 is in the sideways posture P2 arrange the receiving space portion 14 in front of the crossing groove portion 13 in the traveling direction F. The distance between the centers of the receiving space portion 14 and the cross groove portion 13 is set to L1 + L2. Therefore, when the flat carriage form M2 is configured as shown in FIG. 17, the handle portion 5 is fitted in the cross groove portion 13 and does not protrude in the traveling direction F. Therefore, even if the traveling trolley 1 accidentally collides with a wall or a pillar of a building when used as a flat trolley, the loading platform corresponding to the interval distance L1 + L2 including the eaves portion 15 of the loading platform main body 2 Since the impact is received by the front end portion of the main body 2 and does not collide with the handle portion 5, the handle portion 5 and the shaft portion of the pivot mechanism 16 are not damaged.

1 trolley M1 hand trolley form M2 flat trolley form M3 unused storage form 2 loading platform body 2a receiving surface 2b rear end wall part 2c stepped support part 2d receiving part 3 wheel unit 3L left wheel unit 3R right wheel unit Q1 wheel unit Protruding posture Q2 Wheel unit retracted posture 4 Support 4L Left support 4R Right support 5 Handle part 6 Hand pushing means P1 Standing posture of support P2 Sideways posture of support 7 Frame 8 Front wheel 9 Rear wheel 10 Bearing 11 Support shaft 12L Left groove 12R Right groove 12A Recess 12B Recess 12S Expansion recess 13 Cross groove 14 Receiving space 15 Bearing 16 Pivot mechanism 17 1st arm 18 2nd arm 19 Pit member 20 Lower horizontal axis 21 Rotating member 22 Upper horizontal axis 23 Interlocking drive mechanism 24 Drive gear 25 Driven gear 26 Interlocking locking means 27 Locking recess 28 Locking protrusion 29 Locking tool 30 Rod 31 Operation bar 32 Boss 33 Fastener 34a, 34b Stopper 35 Axle locking means 36a, 36b Locking recess 37 Locking protrusion 38 Operating means 39 Slider 40 Sliding member 41 Spring 42 Long casing 43 Operating piece 50 Cover body 50a Notch 50b Operating part 50c Tongue piece 50d Pivot 50e Free end 50f Extended load receiving surface 51 Hing 52 Spring 60 Sideways lock means 61L, 61R Rod 61a Tip lock part 62 Spring 63 Release operation means 64 Casing 65 Hole 66 First lock hole 67 Second lock hole

Claims (3)

A recess (12A) is formed between the rear end wall portion (2b) provided at the rear end portion in the traveling direction (F) and the load receiving surface (2a), and the left and right groove portions (12L, 12R) are formed forward from both the left and right sides of the recess. ) Is extended and the loading platform body (2)
The left and right postures can be changed between the standing posture (P1) that stands up from the left and right ends of the recess (12A) and the sideways posture (P2) that is tilted forward toward the left and right grooves (12L, 12R). Hand-pushing means (6) with stanchions (4L, 4R) and
A pivot mechanism (16) that rotatably pivots the left and right columns (4L, 4R) around the upper horizontal axis (22) inside the recess,
When locked via a sliding member (40) built in a long casing (42) straddled between the pivoting mechanisms (16) and (16) inside the recess (12A), the left and right columns (4L) , 4R) is integrally coupled to the pivot mechanism (16) so that it can rotate with respect to the pivot mechanism (16) when unlocked, and the pivot locking means (35).
Left and right wheel units (3L, 3R) whose posture can be changed between the protruding posture (Q1) protruding downward from the loading platform body (2) and the retracted posture (Q2) stored.
It is provided between the pivot mechanism (16) and the left and right wheel units (3L, 3R), and is pivotally connected to the left and right columns (4L, 4R) integrally connected by locking the pivot locking means (35). The connecting mechanism (16) is rotatably pivoted around the lower horizontal axis (20), and an interlocking drive mechanism (23) is provided to change the posture of the left and right wheel units (3L, 3R) by the rotation. It is a dolly
By reaching the load receiving surface (2a) from the support part (2c) of the rear end wall part (2b) of the loading platform body and rotating the pivoting part (50d), the sideways posture (sideways posture) in the area of the recess (12A) A cover body (50) is provided to cover the area between the left and right columns (4L, 4R) designated as P2).
The cover body (50) has an extended receiving surface that is substantially flush with the receiving surface (2a) by contacting the free-rotating end portion (50e) with the receiving portion (2d) formed on the receiving surface (2a). It forms (50f) and is constantly urged by the spring (52) in the direction in which the free-rotating end is brought into contact with the stepped portion.
When the left and right columns (4L, 4R) integrally connected by the lock of the pivot locking means (35) and the pivot mechanism (16) are rotated around the lower horizontal axis (20), the long casing (42) ) The cover body (50) is configured to be rotated in the opening / closing direction against the spring (52). A notch (50a) is provided at the edge of at least one end of both ends of the cover body (50), and an operation portion (50b) is formed adjacent to the notch. The trolley according to claim 1. A sideways locking means (60) is provided on the recessed portion (12B) formed on the receiving surface (2a) of the loading platform body (2).
The sideways locking means (60) is such that a rod (61) that is slidable toward at least one of the left and right groove portions (12L, 12R) and a tip locking portion (61a) of the rod are projected into the groove. It is composed of a spring (62) that urges the rod to rebound and an unlocking operation means (63) that slides the rod against the spring.
The left and right columns (4L, 4R) of the hand pushing means (6) are provided with lock holes (66,67) that are locked and locked in the tip lock portion (61a) when the left and right columns (4L, 4R) are in the sideways posture (P2). The trolley according to claim 1 or 2, characterized in that it is formed.

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