JPH07251670A - Receiving pallet lift device and slide mechanism for slider - Google Patents

Abstract

PURPOSE:To provide a receiving pallet lift device whereby not only a receiving pallet but also a post can be stored under a cargo box, in the receiving pallet lift device of lifting the receiving pallet along a post vertically provided in a rear end of the cargo box. CONSTITUTION:Relating to a receiving pallet lift device, a part 3 is vertically provided in a rear end of a cargo box 1, and also the device constitutes a receiving pallet 6 liftably by a lift means along the post 3 by holding almost a horizontal condition through a slider 5. Accordingly, a base end part of a storage arm 22 is turnably supported on a car body frame 11 of mounting the cargo box 1, also to provide a point end part of the storage arm 22 fixed to the post, and this storage arm 22 is constituted so as to support the post 3 turned between a work position B of vertically providing the post 3 in the rear end of the cargo box 1 and a storage position of storing the post almost horizontally under the rear end of the cargo box 1, by a telescopic operation of a storage cylinder 26, on the other hand, to provide a binding means 8 for binding the receiving pallet 6, in a condition folded to a side of the post 3, in the receiving pallet 6 and the post 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for lifting and lowering a receiving tray which is constructed so that the receiving tray can be raised and lowered along a post which is provided upright at the rear end of a luggage box.

[0002]

2. Description of the Related Art Conventionally, as a load receiving platform lifting device of this type, as seen in Japanese Patent Publication No. 2-6655, an outer cylinder (corresponding to the post of the present invention, (Hereinafter referred to as a post) is provided upright, and a cargo handling device that raises and lowers the cargo receiving platform in a substantially horizontal state along the post is provided.
The loading tray is configured to be stored under the luggage box in a state of being folded in two.

[0003]

However, in the above-described conventional load receiving platform raising / lowering device, only the load receiving base is stored under the load box, and the post is provided integrally with the load box at the rear end of the load box. Therefore, the total length of the cargo box must be shortened by the amount of the cargo tray and posts, and when loading and unloading luggage without using the cargo tray, the cargo tray and posts installed upright at the rear end of the cargo box can be used. There was a problem that would interfere with the work.

Further, there is also one in which the load receiving base is slid horizontally to store the load receiving base below the load box, but similarly to the above, the post is arranged in an upright state at the rear end of the load box. As the same problem, the ground height of the lower surface of the post becomes small when the vehicle is running, and therefore, the departure angle is small and there is a high possibility of contact with the ground.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a device for raising and lowering a cargo tray which can store not only the cargo tray but also posts under a cargo box.

In Japanese Utility Model Application Laid-Open No. 63-91951, a load carrier is constructed so that it can be lifted and lowered between the cargo box and the ground via a link mechanism provided below the rear end of the cargo box. There is disclosed a cargo handling device that stores a platform under a rear end of a cargo box.

However, this cargo handling apparatus is of a type that raises and lowers the load receiving tray via a link mechanism, and raises and lowers the load receiving tray along a post that is erected at the rear end of the load box as in the present invention. Is different from the basic configuration.

[0008]

According to a first aspect of the present invention, there is provided a device for raising and lowering a cargo receiving stand, wherein a post is erected at a rear end of a cargo box, and the post is provided along the post via a slider. In a loading platform lifting device configured to hold a substantially horizontal state and liftable by a lifting means, a base end of a storage arm is rotatably supported by a body frame on which the loading box is placed, and The front end of the arm is fixed to the post, and the storage arm is stored substantially horizontally at a working position where the post is erected at the rear end of the cargo box and below the rear end of the cargo box by the expansion and contraction operation of the storage cylinder. The load receiving base and the post are provided with lashing means for lashing the load receiving pedestal in a state of being folded toward the post, while being configured to be pivotally supported between the load receiving position and the storage position.

According to a second aspect of the present invention, there is provided a loading platform elevating / lowering device in which the storage arm is pin-connected via a rod to a bell crank rotatably supported by a vehicle body frame and is connected to the bell crank. With the rod end of the storage cylinder connected and the post in the working position, the pivot point of the bell crank and both pivot points of both ends of the rod connecting the bell crank and the storage arm are aligned. It is set to be placed.

According to a third aspect of the present invention, there is provided a device for raising and lowering a cradle, wherein a subpost is vertically slidably disposed in the post, and the slider is slidably disposed in the subpost. .

According to a fourth aspect of the present invention, in the apparatus for raising and lowering a cargo receiving stand, a concave portion having a triangular cross section is formed at an appropriate position on the upper surface of the cargo receiving tray, and one bottom surface of the concave portion is formed as a gently inclined surface. In addition, the other bottom surface is formed to be an inclined surface that is more inclined than the one bottom surface.

According to a fifth aspect of the present invention, in the slider sliding mechanism in the load receiving / descending / descending device, a post is erected at the rear end of the load box, and the load receiving base is provided along the post via the slider. In a loading platform lifting device configured to hold a horizontal state and to be lifted and lowered by a lifting means, the slider is supported by a first lifting roller and a second lifting roller provided above and below the slider, and the inside of the post is supported. The first raising / lowering roller and the second raising / lowering roller are configured in a seesaw type in which rollers are provided on an upper portion and a lower portion of a bracket pivotally supported by the slider. It is provided in a pair on the left and right with the slider in between.

[0013]

According to the load receiving / descending / descending device according to the first aspect of the present invention, the storage arm is rotated by the storage cylinder, so that the post and the load receiving base secured to the post by the securing means are disposed at the rear of the load box. Store below the edge.

Further, according to the load receiving / descending / descending device of the second aspect, when the post is arranged at the working position,
By setting the pivot point of the bell crank and both pivot points of both ends of the rod connecting the bell crank and the storage arm so that they are arranged in a straight line, loads such as posts are transmitted to these pivot points, and the storage cylinder is stored. I try not to overload.

According to a third aspect of the present invention, the sub-post is slidably inserted in the post vertically, and the slider is slidably inserted in the sub-post. By moving the slider up and down within the subpost, the slider contacts the upper end of the subpost and pushes the subpost upward from the inside of the post to lift the cargo cradle. Raise to the floor of the box.

According to the load receiving platform raising / lowering device of the fourth aspect of the present invention, a recess having a triangular cross section is formed at an appropriate position on the upper surface of the load receiving base, and one bottom face of the recess is formed as a gently inclined surface. At the same time, by forming the other bottom surface into an inclined surface that is more inclined than the one bottom surface, it is possible to stably hold the truck etc. on the load receiving table by putting the wheels of the truck etc. in the recessed portion, Let the wheels of the dolly escape from the gently sloping surface.

According to the slide mechanism of the slider in the loading platform raising / lowering device of the fifth aspect of the present invention, the slider is supported by the first raising / lowering roller and the second raising / lowering roller provided above and below the slider. While being slidably mounted in the post, the first elevating roller and the second elevating roller are formed in a seesaw type in which rollers are provided on an upper portion and a lower portion of a bracket pivotally supported by the slider. Since these rollers are provided in a pair on the left and right with the slider interposed therebetween, the load applied to each roller due to the weight of the cradle and the load when the cradle is moved up and down is uniformly distributed, so that the load is stabilized. Support the movement of the slider.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 to 4 show a loading platform raising / lowering device according to the present invention. In addition, in this example, an example in which the load receiving platform elevating device is mounted on a cargo box of a cargo handling vehicle such as a freight vehicle will be described.

The loading platform raising / lowering device includes posts 3 which are vertically arranged on both left and right sides of a rear end of a loading box 1 via a storage mechanism 2.
Subpost 4 slidably inserted in these posts 3
(See FIGS. 4 and 5), sliders 5 (see FIG. 4) inserted in the sub-posts 4 so as to be able to move up and down, a load receiving base 6 rotatably supported by these sliders 5, and the load receiving base. It comprises an elevating mechanism 7 (see FIGS. 4 and 7) for elevating and lowering 6 in a substantially horizontal state.

As shown in FIGS. 4 and 5, the post 3 includes a front post 32 and a rear post 3 which are formed in a hollow columnar shape.
And the rear wall 35 of the rear post 33.
A slit 36 is formed in the vertical direction from the lower end to the vicinity of the upper end (X position in FIG. 4).

Further, a sheave 34 is rotatably supported on the upper portion of the post 3 in which the front post 32 and the rear post 33 communicate with each other at the upper portion. A hollow cross member 37 (see FIGS. 4 and 7) is installed at the lower end between the two posts 3, and a pulley 38 is rotatably supported at the lower part of each of the posts 3. ing.

The sub-post 4 is a hollow columnar body, and is slidably fitted in the rear post 33 of the post 3 up and down. A stopper 41 provided at the upper end of the sub-post 4 abuts the upper end of the post 3 from above, so that the rear post 33 of the post 3 is restricted from sliding downward by a predetermined amount or more. As a result, the sub post 4 can project from the post 3 only to the upper side of the post 3.

Further, the post 3 is provided with a first support roller 42 and a second support roller 43 so that the sub-post 4 can smoothly slide up and down in the rear post 33.

The first support roller 42 is provided at the upper end of the rear wall 35 of the post 3 and supports the rear wall 4a of the sub post 4. The second support roller 43 is provided with a notch in the middle of the front post 32 of the post 3, and a part of the notch is projected from the rear post 33 to support the front wall 4b of the sub post 4. To do.

A slit 45 is formed on the rear wall 4a of the sub post 4 from the upper end to the lower end.

The slider 5 includes a slider body 51 which is inserted into the sub post 4 through the slit 36 and the slit 45, a first elevating roller 53 which is rotatably supported on an upper portion of the slider body 51, and It is composed of a second elevating roller 55 rotatably supported at a substantially central portion.

The first elevating roller 53 is the sub post 4
Rollers abut on the inner surface of the rear wall 4a, and rollers 53a, 53b are provided on the upper and lower portions of a bracket 54 pivotally supported by a pin 54a on the slider body 51. 53b are provided in a pair on the left and right with the slider body 51 interposed therebetween. As a result, the upper and lower rollers 53a and 53b are supported in a seesaw manner around the pin 54a via the bracket 54. In addition, the pair of right and left rollers 53a and the roller 53
b is supported by one roller shaft 54b, 54c which is inserted through the slider body 51. This roller shaft 54
The insertion hole of the slider body 51 through which b and 54c are inserted is formed larger than the roller shafts 54b and 54c, and the left and right rollers 53a and 53b are configured to support the seesaw in synchronization.

The second elevating roller 55 is the sub post 4
The rollers 55a and 55b are in a seesaw type centering on the pin 56a in a pair vertically and horizontally via the bracket 56, as in the case of the first elevating roller 53. It is configured.

Thus, the first elevating roller 53 and the second elevating roller 53
By configuring the elevating rollers 55, the respective rollers 53 are moved by the weight of the load receiving table 6 and the load when the load receiving table 6 is moved up and down.
The loads acting on a, 53b, 55a and 55b are evenly distributed, and the movement of the slider 5 can be stably supported.

As a result, the distance between the first elevating roller 53 and the second elevating roller 55 can be shortened as much as possible, and the distance between the first elevating roller 53 and the second elevating roller 55 can be shortened. The length of the slider 5 can be shortened, and the length of the sub post 4 can be shortened accordingly. Therefore, the length of the sub-post 4 protruding from the upper end of the post 3 when the load receiving platform 6 is raised can be shortened.

As shown in FIG. 4, the load receiving base 6 is rotatably supported by a bracket 52 fixed to the lower portion of the slider body 51 on both sides of its base end by pins 6a. The load receiving base 6 is configured to be supported in a horizontal state by having its base end abut against the lower end of the slider 5 via a stopper 6b.

Further, on the upper surface which is the mounting surface of the cargo receiving table 6,
As shown in FIG. 6, a concave portion 61 having a triangular cross section is provided on the tip side.
Is provided.

The recessed portion 61 is for inserting a wheel of a truck or the like into the recessed portion 61 so as to stop the truck or the like from being self-propelled and to stably mount it on the load receiving table 6. One of the bottom surfaces is gentle. Is formed on the inclined surface 61a, and the other bottom surface is formed on the inclined surface 61b which is more inclined than the one bottom surface. Therefore, by putting the wheels of the dolly or the like in the recess 61, the dolly or the like can be stably held on the load receiving table 6, and the wheels of the dolly or the like can be easily escaped from the gently inclined surface 61a. .

Further, the tip portion 62 of the load receiving base 6 is constructed so as to be foldable via a hinge.

The elevating mechanism 7 includes the cross member 3
The lifting cylinder 71 provided inside 7 and the left and right sliders 5 are fastened to each other via fastening members 73, and are wound around sheaves 34 and pulleys 38 arranged above and below the post 3. A conventionally known one is provided which includes a wire 72 linked to the elevating cylinder 71 and a double amplifying mechanism for elevating the left and right sliders 5 in synchronization with the elevating cylinder 71 extending and contracting.

Next, the storage mechanism 2 will be described with reference to FIGS. 1 to 3.

The storage mechanism 2 comprises a storage arm 22, a rod 24, a bell crank 25, a storage cylinder 26, and a lashing device 8.

The storage arm 22 has a base end rotatably supported around the pin 21 via a bracket 22a on the rear end side of the vehicle body frame 11 on which the luggage box 1 is mounted, and a tip end. Is fixed in the middle of the post 3.

The bell crank 25 is supported by the body frame 11 via a bracket 25a so as to be rotatable around a pin 23, and the storage arm 22 is provided with the rod 2 as a center.
It is pivoted through 4. Both ends of the rod 24 are pivotally supported by the storage arm 22 and the bell crank 25 by pins 27 and 28.

The storage cylinder 26 has its base end pivotally supported by the bracket 25a and its rod end 2
6a is pivotally supported on the bell crank 25.

Accordingly, the retracting operation of the retracting cylinder 26 causes the retracting arm 22 to rotate via the bell crank 25 and the rod 24, so that the post 3 moves around the pin 21 as a center, as shown in FIG. 1. A storage position A for storing in a substantially horizontal state below the rear end of the storage box 1 and a packing box 1 as shown in FIG.
It is arranged at a work position B which stands substantially vertically at the rear end.

The lashing device 8 comprises a hook 81 provided on the post 3 and an engaging member 82 provided on the load receiving base 6 and configured to be detachable from the hook 81. After raising 6 to the position C shown in FIG. 1, at this position C, the load receiving base 6 is pivoted upward until it comes close to the post 3, and the engaging member 82 is engaged with the hook 81. 6 is fixed in this state (see the chain double-dashed line in FIG. 1). Further, as means for stopping the lifting and lowering of the load receiving base 6 at the position C, it may be detected by a detector such as a limit switch or a photoelectric sensor.

The hook 81 may be provided on the side of the load receiving base 6. Further, the fastening device 8 is not limited to the one constituted by the hook 81 and the engaging member 82 as in this example, but may be one fastened by a lock pin.

The storage mechanisms 2 thus constructed are provided in a pair of left and right corresponding to the left and right posts 3. In addition, if possible in terms of strength, the middle portions of the left and right posts 3 are connected by an appropriate connecting member, and the storage arm 22 is connected to this connecting member.
By fixing the tip of the, the storage operation may be performed by the single storage mechanism 2.

Here, in the storage mechanism 2, when the post 3 is arranged at the working position B, the pin 23 pivotally supporting the bell crank 25 and the rod 24 connecting the bell crank 25 and the storage arm 22. Pin 2 that supports both ends of the
7 and 28 are set to be arranged in a straight line. As a result, when the post 3 is arranged at the working position B, the moment load due to the weight of the post 3 applied to the pin 28 is transmitted to the pins 21 and 23, and the storage cylinder 26 is not loaded. It does not take.

Next, the operation of the load receiving platform elevating device constructed as described above will be described.

First, in the raising / lowering operation of the load receiving table 6, the post 3 is arranged at the work position B as shown in FIG. 1, and the lifting cylinder 71 is expanded / contracted while the load receiving table 6 is held horizontally. This allows the slider 5 to pass through the wire 72.
Is a seesaw type first elevating roller 5 in the sub post 4.
3 and the second elevating roller 55 slide while being supported, and as the slider 5 slides, the load receiving table 6 moves up and down.

When raising and lowering the load receiving tray 6, in order to raise the load receiving tray 6 to a position substantially flush with the floor surface of the load box 1,
The slider 5 rises in the sub post 4 and
The slider 5 is further raised in this state to push up the sub post 4 from inside the rear post 33 as shown by the chain double-dashed line in FIG.

Since the sub-post 4 is projected from the post 3 in this way to secure the lifting range of the load receiving base 6, the post 3 can be shortened, and the post 3 can be replaced when the post 3 is stored later. It can be stored without interfering with other members and without protruding from the rear end of the luggage box 1.

Next, a description will be given of the operation in the case where the loading and unloading of the cargo by the above-mentioned lifting operation is completed and the post 3 and the cargo receiving tray 6 are stored from the working position B to the storage position A.

First, as shown in FIG. 1, in a state where the post 3 is arranged at the working position B and the load receiving tray 6 is held horizontally, after the load receiving tray 6 is placed at the retractable height position C. , The operator lifts the receiving tray 6 and rotates it upward,
Folding the load receiving base 6 toward the post 3 as shown by a chain double-dashed line. Then, in this folded state, the loading tray 6 is fastened by the fastening device 8. In addition, as means for stopping the loading platform 6 at a retractable height position C, in addition to stopping by manual operation, a detector such as a limit switch or a photoelectric sensor is used to detect and lift the loading platform 6 based on this detection. Can also be stopped.

Thereafter, when the storage cylinder 26 is retracted, the bell crank 25 rotates counterclockwise about the pin 23 in FIG. 1, and this rotation causes the storage arm 22 to move to the pin 21 via the rod 24. Rotate clockwise around. As a result, the post 3 fixed to the tip of the storage arm 22 rotates about the pin 21 of the storage arm 22.

As a result, the post 3 is stored under the rear end of the cargo box 1 in a state in which the cargo tray 6 is folded by the securing device 8 (see FIG. 3). Then, the storage holding member (not shown) stably stores and holds the storage state.

Further, the operation from the storage position A to the working position B is carried out by the operation opposite to the above-mentioned operation from the working position B to the storage position A by extending the storage cylinder 26.

When the post 3 is placed in the working position B, the pins 23 and the pins 27 and 28 are placed in a straight line. Therefore, a load due to a moment load due to the weight of the post 3 acting on the pin 28 is applied. Is transmitted to the pin 23, and the storage cylinder 26 is not loaded. Therefore, even if a problem such as an oil leak occurs in the storage cylinder 26, the post 3 does not tilt and is safe.

In this example, the storage cylinder 26 and the storage arm 22 are connected to each other via the link mechanism including the bell crank 25 and the rod 24, but as shown in FIG.
When the post 3 is placed in the working position B, the storage cylinder 26 is provided with appropriate holding means 9 such as a holding metal fitting for firmly holding the post 3 in this position in the luggage box 1 or the vehicle body frame 11. It is also possible to connect directly to 22. In this case, even if an oil leak occurs in the storage cylinder 26, the post 3 is firmly fixed at the working position B by the holding means 9, and therefore the post 3 does not rotate downward. The holding means 9 is operated by the handle 91 to hold and release the post 3.

[0058]

As described above, according to the loading platform elevating / lowering device of the first aspect of the present invention, the storage arm is rotated by the storage cylinder, so that the post and the post are secured by the fastening means. Since the bound cradle can be stored below the rear end of the luggage box, the post is also placed below the rear end of the luggage box during storage, even when loading and unloading luggage without using the cradle. The cradle and the post do not interfere with the work, and the total length of the cargo box can be increased by the length of the cradle and the post.

According to the load receiving platform raising / lowering device of the second aspect, both the pivotal fulcrum of the bell crank and both ends of the rod connecting the bell crank and the storage arm are arranged in the state where the post is placed in the working position. Since the pivot point and the pivot point are set so as to be aligned with each other, no load is applied to the storage cylinder, and even if a problem such as oil leak occurs in the storage cylinder, the post does not tilt and it is safe.

According to the loading platform elevating / lowering device of the third aspect of the present invention, the sub-post is slidably inserted in the post vertically, and the slider is slidably inserted in the sub-post. By moving the slider up and down within the subpost, the slider contacts the upper end of the subpost and pushes the subpost upward from the inside of the post to lift the cargo cradle. By raising to the bottom of the box, the lifting range of the cradle is secured, which allows the post to be shortened, and prevents the post from interfering with other members when storing the post and after It can be stored without protruding from the edge.

According to the fourth aspect of the present invention, there is formed a concave portion having a triangular cross section at an appropriate position on the upper surface of the cargo receiving tray, and one bottom surface of the concave portion is formed as a gently inclined surface. At the same time, by forming the other bottom surface into an inclined surface that is more inclined than the one bottom surface, it is possible to put the wheels of the dolly or the like in the recesses and stably hold the dolly or the like on the load receiving base. At the same time, the wheels of the trolley and the like can be easily escaped from the gently inclined surface, which is safe and has good workability.

According to the slider sliding mechanism in the load receiving platform raising / lowering device of the fifth aspect of the present invention, the slider is supported by the first raising / lowering roller and the second raising / lowering roller provided above and below the slider. While being slidably mounted in the post, the first elevating roller and the second elevating roller are formed in a seesaw type in which rollers are provided on an upper portion and a lower portion of a bracket pivotally supported by the slider. Since these rollers are provided in a pair on the left and right with the slider interposed therebetween, the load applied to each roller due to the weight of the cradle and the load when the cradle is moved up and down is uniformly distributed, so that the load is stabilized. The movement of the slider can be supported, and the axial distance between the first elevating roller and the second elevating roller can be shortened. Therefore, when the sub post is provided, the length of the sub post can be shortened, and as a result, the amount of protrusion from the rear end of the vehicle can be suppressed during storage.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which a load receiving platform raising / lowering device according to the present invention is placed at a work position.

FIG. 2 is a rear view of a partial cross section showing a mounting state of a storage arm and a bell crank.

FIG. 3 is a side view showing a state where the load receiving platform raising / lowering device according to the present invention is arranged at the storage position.

FIG. 4 is a partially cutaway side view showing a configuration of a post of the load receiving platform lifting device.

5 is a cross-sectional view taken along line AA of FIG. 4 with some parts omitted.

FIG. 6 is a side view showing a front end portion of the cargo receiving table.

FIG. 7 is a rear view showing a state where the load carrier of the load carrier lifting device is fixed at the working position.

FIG. 8 is a side view showing another embodiment of the load receiving platform lifting device.

[Explanation of symbols]

 1 Packing Box 11 Body Frame 2 Storage Mechanism 22 Storage Arm 23 Pin 26 Storage Cylinder 27 Pin 28 Pin 3 Post 4 Subpost 5 Slider 53 First Elevating Roller 53a, 53b Roller 55 Second Elevating Roller 55a, 55b Roller 6 Load Stand 61 Concave 7 Lifting mechanism (lifting means) 8 Lashing device (latching means) A Storage position B Working position

Claims (5)

[Claims] Claims: 1. A post is provided upright at the rear end of the cargo box, and the post is constructed so that the post can be moved up and down by the elevating means while holding the post along the post in a substantially horizontal state via a slider. In the device, a base end portion of a storage arm is rotatably supported by a vehicle body frame on which the luggage box is mounted, and a tip end portion of the storage arm is fixed to the post. While being extended and retracted, the post is pivotally supported between a working position in which it is erected at the rear end of the luggage box and a storage position in which it is stored substantially horizontally below the rear end of the luggage box. And a lashing device for lashing the cradle to the post in a state where the cradle is folded to the post side. 2. The storage arm is pin-connected via a rod to a bell crank rotatably supported by a vehicle body frame, the rod end of the storage cylinder is connected to the bell crank, and the post is the aforesaid. The load receiving device according to claim 1, wherein the pivotal fulcrum of the bell crank and both pivotal fulcrums of both ends of a rod connecting the bell crank and the storage arm are arranged to be aligned in a state of being arranged in the working position. Platform lifting device. 3. The load receiving platform elevating / lowering device according to claim 1, wherein a sub post is slidably mounted on the post in a vertically slidable manner, and the slider is slidably mounted in the sub post. 4. A concave portion having a triangular cross-section is formed at an appropriate place on the upper surface of the load receiving base, one bottom surface of the concave portion is formed as a gently inclined surface, and the other bottom surface is more than the one bottom surface. The inclined surface is formed as a steep inclined surface,
The loading platform elevating device according to 2 or 3. 5. A raising and lowering of a loading tray, wherein a post is erected at the rear end of the luggage box, and the loading tray along the post is held in a substantially horizontal state via a slider and is vertically movable by an elevating means. In the apparatus, the slider is interposed so as to slide in the post while being supported by a first elevating roller and a second elevating roller provided above and below the slider.
The elevating roller is of a seesaw type in which rollers are provided on the upper and lower parts of a bracket pivotally supported by the slider, and a pair of left and right sliders for sandwiching the slider are provided in a load receiving platform elevating device. Slide mechanism.