JPH0939641A - Platform tilting device on lift device of freight-train car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly maintain elevating and tilting motions of a platform without influence of external force on a runner of an elevating mechanism even when the platform is tilted. SOLUTION: A tilting mechanism of hinge structure free to slide a connecting part of a lower end part of a runner 70 and a hinge plate provided on a crossbeam member 98 is provided on a lift device of a freight-train car arranging the runner 70 in a column erected on both of the left and right sides of a rear end of a cargo box, connecting a lower end of the runner 70 by the crossbeam member 98, placing a front end of a platform 41 on the crossbeam member 98 and holding a rear end by a wire 88 suspended on the runner 70.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lift device for a freight vehicle, and more particularly to a platform tilting device for a lift device of a type in which a platform is stored in a storage room on the lower surface side of a floor.

[0002]

2. Description of the Related Art Conventionally, as a platform tilting device, for example, FIG. 13 disclosed in Japanese Utility Model Laid-Open No. 5-28742.
There is a lift table 8 as a configuration of this publication.
The rear end is not held by the wire,
As shown in (a) and (b), a lifting inner pillar 2 is vertically movable on a gate pillar 1 provided on the left and right of the rear side of the body, and a vertical direction is provided on the rear surface of the lower end of the left and right lifting inner pillars 2. A bracket 3 having a long hole 4 having a predetermined length is attached to the bracket 3. Between the brackets 3, a horizontal beam 5 is attached to both ends of a pin 6, and a pin 6 is inserted into the long hole 4. Slot 4 through 6
Is mounted movably up and down along with, and at the position near the left and right end portions of the upper surface of the cross beam 5, a front end side of the lift table 8 is supported and held horizontally, and a guide 7 is slidably provided. Has been. In this way, the left and right lifting inner pillars 2 that support the lift table 8 in a linked manner are lowered,
When the horizontal beam 5 is grounded, the horizontal beam 5 is moved upward along the elongated hole 4 via the pin 6, whereby the front end side of the lift table 8 is lifted by the length of the elongated hole 4 to lift the lift table. 8 is provided so as to be inclined.

Further, as another platform tilting device, there is, for example, the one disclosed in Japanese Utility Model Publication No. 62-39956, and the one disclosed in this publication is a type in which a ground plate is flipped up, as shown in FIG. Body 1
0 is hinged to a hinge bracket 13 attached to the lower end of a runner 12 which moves vertically by being guided by columns 11 standing on the left and right, and is supported by a stopper 15 to the runner 12. A tapered ground plate 16 is provided, and the hinge pin 14 provided on the ground plate 16 is a hinge bracket 13.
The lower part of the ground plate 16 on the hinge pin 14 side is normally located below the lower part of the hinge bracket 14 and is supported by a long hole 17 provided in the vertical direction. When the lower part is grounded and the runner 12 is further lowered, the hinge pin 14 side of the ground plate 16 has the same hinge pin 1
It is inclined along the long hole 17 through 4.

[0004]

However, in the former configuration, since the elevating inner column 2 and the lateral beam 5 are connected by the elongated hole 4 and the single pin 6, the rear end of the lift table 8 is connected to the wire. If the lift table 8 cannot be held horizontally and is supported by wires or the like,
Since the horizontal beam 5 tilts together with the lift table 8 after the horizontal beam 5 lands, there is a problem in that an unreasonable external force is applied to the elevating inner column 2 due to displacement from the landing position of the horizontal beam 5, causing deformation and lowering the function. Also, the latter configuration has the same problem as the former. The present invention has been made to solve the above-mentioned problems, and even if the platform is tilted, external force is not applied to the runner of the lifting mechanism, and the lifting and tilting operations of the platform can be smoothly maintained. An object of the present invention is to provide a platform tilting mechanism in a vehicle lift device.

[0005]

SUMMARY OF THE INVENTION In order to solve the above technical problems, the present invention arranges runners vertically movable in columns standing on the left and right sides of the rear end of a luggage box, and the lower end of the runner is a horizontal beam member. In the lift device of the freight vehicle, the front end of the platform is placed on the transverse beam member, and the rear end is held by the wire stretched on the runner.
The connection between the lower end of the runner and the bracket provided on the cross beam member is a hinge structure that is vertically slidable, and the lower end of the runner and the bracket forming the hinge structure are at least one side. A plurality of long holes parallel to the up-and-down direction are provided, and a plurality of pins are erected slidably in the long holes on the other side, and further, the hinge structure has the lower edge of the bracket as the runner of the runner. The platform tilting device for a lift device for a freight vehicle according to claim 1, wherein the platform tilting device is held at a position lower than the lower end by a predetermined dimension. With the above structure, the runner's movement before and after landing can be smoothly performed. In addition to being able to perform, it is possible to smoothly perform tilting movement and horizontal movement of the platform.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a freight vehicle 21 having a body 22 formed in a box-shaped luggage compartment having a fixed roof. It is a van type and has a rear opening W of the body 22.
Is formed on the lower surface side of the lift device 40 and the floor 23 of the body 22, and a storage chamber 25 for storing the platform 41 of the lift device 40 in a horizontally slidable and retractable manner is formed. .

As shown in FIGS. 2, 3 and 4, the storage chamber 25 includes a floor 23 of the body 22 and a chassis frame 2.
6 and 26, between the floor 23 of the body 22 and the chassis frames 26, 26, there are two vertical main sills 27, 27 (vertical joists) and a horizontal cross sill. A frame of a body 22 including a plurality of frames 28 to 28 (horizontal joist) is interposed. The chassis frames 26, 26 are arranged in parallel in the vehicle width direction at regular intervals as in the conventional case. This chassis frame 26
A main sill 27 is fixed to the upper surface of the chassis along a chassis frame 26 via a shim 29.

Further, as shown in FIG. 2, the main sill 27 is formed stepwise in the height direction, and the predetermined range from the rear end (right end in the drawing) to the depth direction (left side in the drawing) is lowered. ing. A partition member 3 that also functions as a cross sill is provided on the stepped portions of both main sills 27, 27.
0 is fixed across the width. Hereinafter, the lower portion on the rear side of the partition member 30 will be referred to as the stepped lower portion 27a of the main sill 27, and the portion on the front side of the partition member 30 will be referred to as the stepped higher portion 27b of the main sill 27. A plurality of cross sills 28 to 28 are directly mounted on the upper surface of the stepped high portion 27b of the main sill 27, and are also fixed to the left and right main sills 27b and 27b.

The stepped lower portion 27 of the main sill 27
Between the a and 27a, two support members 31 and 31 are fixedly arranged in the front and rear direction with an appropriate interval and with the upper surface of the stepped lower portion 27a flush with each other. On the upper surfaces of the front and rear support members 31, 31, both main sills 2
Two guide rails 32, 3 each having a substantially U-shaped cross section are provided substantially at the center between the stepped lower portions 27 a, 27 a.
Two are back-to-back and fixed in a crossed manner along the front and back. The front end portions of both guide rails 32, 32 are abutted against the partition member 30. The center guide rails 32, 32 guide the center guide rollers 44, 44 of the platform 41.

Further, a total of three cross sills 33 are mounted and fixed on the upper surfaces of the guide rails 32 at appropriate intervals in the front and rear. This cross sill 33-33
And between the both ends of the support members 31, 31, guide rails 34, 34 having a substantially U-shaped cross section for guiding the guide rollers 44, 44 near the both ends of the platform 41.
Has been fixed. The two guide rails 34, 34 are arranged from the partition member 30 to the rear end of the body 22.

Further, as shown in FIG. 4, between the lower edge 32a of the central guide rail 32 and the lower edge 34a of the outer guide rail 34, on the upper surface of the support member 31 and the stepped lower portion 27a. The bottom plates 36, 36 are attached to each other, and the storage chamber 25 is formed on the upper surface side thereof. This bottom plate 36,
The storage chamber 25 is shielded from the ground side by 36 so that mud or the like splashed by the rear wheels does not enter the storage chamber 25.

On the outside of the guide rail 34, side frames 35, 35 extending from the front end to the rear end of the body 22 are fixed in parallel with each other. Both side frames 3
The upper surfaces of the cross sills 28 to 28, the upper surface of the partition member 30, and the upper surfaces of the cross sills 28 to 28 fixed to the stepped high portion 27b of the main sill 27 are substantially flush with each other between the upper edges of the 5, 35. The floor 23 is mounted and fixed on the upper surfaces of these.

In the body 22 constructed as described above, a storage room 25 for storing the platform 41 is provided.
However, the depth is defined by the cross sill 33 and the bottom plate 36 in the height direction, and the outer guide rails 34, 34 in the left and right direction in the depth defined by the partition member 30, and this range is shown in FIG. In FIG. 4, the height VH,
The storage chamber 25 is formed to have a width VW and a depth length VL, and as shown in FIG. 2, the storage chamber 25 is formed with an extension portion 25a extending rearward from the chassis frame 26 by a predetermined length VL1. A step member 37, which is flush with the floor 23, is attached along the width VW, a drive portion 50 of the lift device 40 is formed on the lower surface side, and both sides of the extension portion 25a of the storage chamber 25 are formed on both sides. A column 66 of the lift device 40 is erected. Then, the guide rails 32, 32 are provided in the vehicle width direction center of the storage chamber 25 provided in such a range.
The main sill 27 is
The cross sill (upper cross sill 33) is supported instead of the stepped lower portion 27a, and therefore the body 22 is reinforced by providing the storage chamber 25.

The body 2 having the storage chamber 25 thus formed
A lift device 40 is provided on the rear opening W side of the second portion. The lift device 40 includes columns 66 standing upright on the left and right sides of the drive unit 50 and the body 22, a runner 70 installed along the columns 66 and moved up and down, and a runner 70.
Elevating mechanism 6 which is connected to the horizontal beam member 98 horizontally attached to the lower end of the runner and the drive unit 50 to move the runner 70 up and down.
Beam member 98 provided in a horizontal shape between the No. 5 and the runner 70
The front end base is placed on the wire and the rear end is on the runner side.
The platform 41 horizontally moved up and down to the grounding position and the position where it is suspended and connected to the storage chamber 25 by being hung up and down via 8 and the lower ends of the left and right runners 70 and the lateral beam member 98.
Tilting mechanism 9 of the platform 41 provided between the ends of the
It is composed of 0 and.

As shown in FIGS. 8 and 9, the platform 41 has a substantially rectangular plate shape so that it can be stored in the storage chamber 25, and an auxiliary plate 42 is provided at the rear end portion thereof so as to be rotatable in the front-rear direction. ing. The auxiliary plate 42 can be swung forward to be stored on the upper surface of the platform 41 in a superposed manner, while if swung backward, the auxiliary plate 42 is lowered between the ground 41 and the ground GL when the platform 41 is lowered to the ground GL. The box pallet with wheels is mounted so that it can be loaded and unloaded in order to absorb the step.

A slit 43 is provided at the center of the platform 41 in the vehicle width direction to allow the guide rail 32 disposed in the central portion of the storage chamber 25 to escape when stored in the storage chamber 25. The slit 43 is opened on the front end side and closed on the front end side, and is provided with a length long enough to allow the guide rail 32 to escape and to store the platform 41 in the storage chamber 25 almost completely. In addition,
A groove portion 42a is formed in the center of the auxiliary plate 42 so as to correspond to the slit 43. When the auxiliary plate 42 is stored on the upper surface of the platform 41 in a stacked manner, the rear portion of the slit 43 is an auxiliary plate. It is not blocked by 42.

Further, guide rollers 44 to 44 are provided at four positions near both ends of the front end of the platform 41 and both sides of the slit 43, while grips 45, 45 are provided at two positions of the rear end edge. Once attached, the platform 41 can be easily stored and taken out manually. This platform 41 is a body 2
The storage height is slightly lower than that of the second floor 23, and it is stored in the storage chamber 25 by sliding it forward in the horizontal state.

Next, as shown in FIG. 7, for example, the drive unit 50 disposed below the extension 25a of the storage chamber 25 has a piston rod 5 of a horizontally arranged hydraulic cylinder 51.
A left chain wheel 54 and a right chain wheel 55 are pivotally attached to the tip of 2 via a ram head 53, and a left chain wheel 56 and a right chain wheel 57 are arranged at predetermined positions on the left and right of the hydraulic cylinder 51. In addition, the intermediate chain wheel 58 for the right side is coaxial with the left chain wheel 56.
Are arranged. Then, one end of the left chain 60 is attached to the plate 59 and is hooked downward on one of the left chain wheels 54 of the ram head 53 to be folded back. Further, the same chain 60 is hooked upward on the left chain wheel 56. Upper chain wheel 6 attached to the upper part of the left column 66
The runner 70 is engaged with the 2 and introduced into the column 66.
It is connected to. Further, one end of the right chain 61 is attached to the plate 59, is hooked upward on the other right chain wheel 55 of the ram head 53, and is folded back.
The intermediate chain wheel 58 is hooked downward and folded back, and the same chain 61 is hooked upward on the right chain wheel 57 and is hooked on the upper chain wheel 63 attached to the upper part of the right column 66 to engage the column 66. It is introduced inside and is connected to the runner 70. The left and right runners 70 are moved up and down to vertically move the platform 41 by expanding and contracting the hydraulic cylinder 51 of the drive unit 50 provided in this way. The valve 64 provided on the piston chamber side of the hydraulic cylinder 51 is connected to a hydraulic pressure generator (not shown) mounted on the vehicle through a hydraulic hose, and the hydraulic circuit of the valve 64 may be damaged. Even Platform 41
Is designed to descend at a constant speed without a sudden drop.

Next, a column 66 which constitutes the lifting mechanism 65.
Are erected on the left and right on the rear side of the body 22, and the column 6
As shown in FIG. 11, 6 is formed in a tubular body having a substantially rectangular cross section and having a predetermined length.
A guide groove 67 having a predetermined width is formed in the longitudinal direction of the central portion of the upper chain wheel 62 rotatably supported on the upper end of the left column 66 as shown in FIG. An upper chain wheel 63 is rotatably supported at the upper end portion of the column 66 of the above, and the chain wheels 60 and 61 from the drive unit 50 are engaged with the both chain wheels 62 and 63 and introduced into the left and right columns 66, respectively. The end portion of the column 66 is connected to a runner 70 that is vertically movable inside the column 66. The runners 70 installed in the left and right columns 66 have the same configuration.

The runner 70 which is moved up and down by the column 66A is, as shown in FIGS. 5 and 6, the left and right side plates 7 of the long piece.
1 and the cover plate 72 of the short piece are formed to have a predetermined length with a substantially U-shaped cross section that opens to the rear side, and reinforcing members 73a and 73a are attached at predetermined upper and lower positions on the opening side,
A connecting member 74 that connects the chains 60 and 61 is pivotally attached to the upper end side via a pin 74a. Further, a cutout portion 71a is formed on the lid plate 72 side at a predetermined height position from the lower end portion of the runner 70, and the front edge 66b of the column 66 is formed in the cutout portion 71a via a bracket (not shown). A pair of left and right guide rollers 75 rolling on the inner surface is pivotally mounted, and the inner side surface of the rear edge 66a of the column 66 is rolled via a bracket 76 on the opening side at a predetermined lower position from the upper end. A pair of upper and lower guide rollers 77 are pivotally mounted.

Further, the runner 70 is provided with a suspension mechanism 78 for suspending the left and right sides of the rear end of the platform 41 by wires 88 and holding the platform 41 horizontally when the platform 41 is pulled out. There is. This suspension mechanism 78
A pulley 80 is pivotally mounted at a predetermined position on the upper part of the runner 70 via a shaft pin 79, and a wire end pin 81 is pivotally mounted at a predetermined position below the pulley 80, and the end pin 81 is pivotally mounted. Corresponding to the left and right side plates 71, elongated holes 82 having a predetermined length are vertically provided so as to penetrate therethrough as shown in FIG. A tension pulley 85 is pivotally attached to the formed bracket 83 via a shaft 84, and
The bracket 83 is attached via a shaft 84 so as to be vertically movable along the elongated hole 82. Further, a fixing member 86 is attached in parallel with the lower side reinforcing member 73b, and a coil spring 87 having a predetermined spring pressure is attached between the fixing member 86 and the bottom portion of the bracket 83 to provide a tension pulley 85. Are provided so as to urge downward.
One end of the wire 88 is attached to the wire end pin 81 thus arranged, the wire 88 is engaged with the tension pulley 85 and folded back upward, and the wire 88 is engaged with the pulley 80 on the upper side. Is guided to the rear side from the guide groove 67 of the column 66, and the other end of the wire 88 is attached to brackets 89 provided on the left and right of the rear end of the platform 41. The tilting mechanism 9 is provided between the lower ends of the left and right runners 70 thus provided.
A transverse beam member 98 is attached via 0.

The tilting mechanism 90 formed at the lower ends of the left and right runners 70 is, for example, as shown in FIGS.
As shown in FIG. 11, a plurality of hinge elongated holes 91 a and 91 b formed on the lower end side of the runner 70 and the cross beam member 98.
And hinge pins 96a, 96b and 97a, 97b attached to hinge plates 93 attached to both ends of the. The hinge long holes 91a and 91b are provided in parallel on the side plate 71 on the lower end side of the runner 70 with a predetermined interval in the vertical direction at a predetermined interval (two cases are exemplified in this example). This is a side plate 71
Reinforcing members 92 are attached to the inner side surface of the above along the both edges of the long holes 91a and 91b by welding means or the like. In addition, the hinge plate 93 is inserted into the runner 70, and further, the support portion 94 having a substantially rectangular shape having a width protruding from the guide groove 67 of the column 66 to the rear portion side, and the rear portion at the lower end of the rear edge 94a of the support portion 94 are rear portions. The hinge plate 93 is formed in a substantially L-shape by forming the attachment portion 95 of the lateral beam member 98 protruding to the side.
At a predetermined position of the support portion 95, the hinge long holes 91a,
The hinge pins 96 corresponding to 91b are vertically spaced at predetermined intervals.
The hinge pins 96a, 96b and 97a, 97b are attached to the side plate 71 of the runner 70 in the long hole 91.
The hinge plate 93 is inserted through the a and 91b, and the hinge plate 93 is inserted through the hinge pins 96a and 96b and 97a and 97b.
It is attached so as to be vertically slidable along 1a and 91b. A cross beam member 98 having a substantially rectangular cross section is horizontally installed between the attachment portions 95 of the left and right hinge plates 93 of the tilting mechanism 90 formed in this way.

In the left and right hinge plates 93 on which the horizontal beam members 98 thus provided are horizontally mounted, normally, the hinge pins 96b and 97b are brought into contact with the lower ends of the hinge elongated holes 91a and 91b, respectively. Lower edge 93a
Is held at a position of length L with respect to the lower end 70a of the runner 70, and in this state, the platform 4 is placed on the cross beam member 98.
By pulling 1 out, the front end base of the platform 41 is placed, the left and right sides of the rear end are held horizontally through the wires 88 of the suspension mechanism 78, and the platform 41 holds the position at the withdrawal position. A locking mechanism 46 is provided.

As shown in FIGS. 8 and 9, the locking mechanism 46 has a substantially L-shaped handle 47 rotatably supported at the center of the rear end side surface of the platform 41. The handle 47 is provided at the front end of the handle 47. Two connecting rods 4 are provided at two peripheral portions of the circular plate 47a facing each other in the radial direction.
One ends of 8, 48 are hooked respectively, and the other ends are connected to a disc 49a provided on the rear end side of a joint rod 49 rotatably supported along the side frame 41a of the platform 41, and A stopper plate 49b is attached to the front end side of the joint rod 49. The stopper plate 49b has its own weight when the handle 47 is in a horizontal position (position shown by a solid line) as shown in FIG. It is provided so as to be vertically downward, that is, vertically positioned on the rear portion of the rear surface 98a of the cross beam member 98, the platform 41 is prevented from moving in the storage direction, and the handle 47 is pivoted to the upper vertical position. As a result, the stopper plate 49b (indicated by a chain double-dashed line) is rotated and is housed in the frame of the platform 41, so that the horizontal beam member is formed. The platform 41 is provided so as to be able to move to the storage chamber 25 side by being retracted from the rear surface 98a of 8, and the handle 47 is always in a horizontal position by, for example, a torsion spring (not shown) without operating. It is held in place. In addition, this platform 41
Pushes the handle 47 in the vertical position, stores it in the storage chamber 25, and when the handle 47 is released, the handle 47 becomes the horizontal position and the stopper plate 4
9b is provided in a vertical shape so as to be engaged with a locking portion (not shown) provided in the deep portion of the storage chamber 25 and to be prevented from moving in the pull-out direction.

In the cargo handling operation of the lift device 40 thus provided, first, the platform 41 stored in the storage chamber 25 is operated by operating the handle 47 of the lock device 46 to unlock, and the handle 45 is moved in the pull-out direction. Withdraw. At this time, the hydraulic cylinder 51 of the drive unit 50 is in an extended state, and the left and right runners 70 are regulated by a platform storage height positioning device (for example, a manual type) although not shown, and the lower ends of the left and right runners 70 are controlled. Although not shown, the horizontal beam member 98, which is laterally stretched between the hinge plates 93 of the tilting mechanism 90 provided at the portion, is positioned at the storage height of the platform 41, but the horizontal beam member 98 is not shown.
The position is held by the natural fall prevention device. Then, with this pulling-out operation, the natural dropping device is operated to release the position retention, and the wire 88 suspending the rear end portion of the platform 41 resists the spring pressure of the coil spring 87 and makes the tension pulley 85 a long hole. As the shaft 84 of the tension pulley 85 is brought into contact with the upper end of the elongated hole 82, the wire 88 is stopped from being pulled out while being pulled up along the line 82, and the platform 41 is moved to the storage chamber 25.
The front end base portion of the platform 41, which is further pulled out, is horizontally held while being placed on the cross beam member 98.

After completion of pulling out the flat home 41, the hydraulic cylinders 51 of the drive unit 50 are shortened to extend the left and right chains 60 and 61, and the left and right runners connected to the chains 60 and 61. 70 is lowered integrally with the lateral beam member 98 with respect to the left and right columns 66 via guide rollers 75, 77, and the platform 41 is also lowered while being held horizontally.

The lower edge 93a of the hinge plate 93 of the tilting device 90 formed on the lower ends of the left and right runners 70.
12 is in contact with the ground GL, the lower end 70a of the runner 70 is located at a height L above the ground GL as shown in FIG. 12, and the platform 41 is held horizontally. When the hydraulic cylinder 51 is shortened in this state, the left and right runners 70 have the hinge long holes 91a formed at the lower ends thereof.
Hinge pins 96a, 96b and 97 via 91b
It is descended along a and 97b. This left and right runner 7
As the pulley 80, which engages the wire 88 attached to the upper end of the runner 70, is also lowered when the platform 41 is held down, the bracket 89 on the rear end side of the platform 41 is attached. The position and the engagement length of the pulley 80 are changed, the platform 41 is tilted about the front end base portion mounted on the cross beam member 98, and the hinge pins 96a and 97a contact the upper ends of the hinge long holes 91a and 91b. In this state, the lower ends 70a of the left and right runners 70 are grounded to the ground GL,
The rear end side of the platform 41 is also grounded and inclined at a predetermined angle. By rotating the auxiliary plate 42 rearward in this state, the step between the ground GL and the rear end side of the platform 41 is eliminated, and the box pallet with wheels can be easily loaded and unloaded.

When the hydraulic cylinder 51 of the drive unit 51 is extended, the chains 60 and 61 are pulled in, whereby the left and right runners 70 are hinged to the hinge pins 96a via the elongated holes 91a and 91b for hinges on the lower end side. , 96
b and 97a, 97b, the pulley 80 is also raised with this rise, and the platform 41 is horizontally rotated from the inclined state, and the hinge long hole 9
The platform 41 is returned to the original horizontal state with the lower end portions of the 1a and 91b contacting the hinge pins 96b and 97b. Then, the hydraulic cylinder 51 is extended to stop the platform 41 at a position aligned with the floor 23 of the body 22 so that it can be loaded and unloaded onto / from the body 22. You can

Then, the cargo handling is completed and the platform 4
1 is stored, the platform 41 is stored in the storage room 2
It is possible to stop at the front of the storage chamber 25 by manually operating the storage positioning device at a position below 5 to extend the hydraulic cylinder 51. Then, by rotating the handle 47 at the front end of the platform 41 to the vertical position, the stopper plate 49b is retracted into the frame of the platform 41, the engagement with the cross beam member 98 is released, and the handle 45 is gripped and pushed. As a result, the front end base of the platform 41 gets into the storage chamber 25 via the guide roller 44 provided at the front end of the platform 41, and is further pushed to operate the natural fall prevention device of the runner 70 to operate.
The position 0 is maintained and the platform 41 is stored in the storage room 25.
When the stopper plate 49b is in the state of being stored in the storage chamber 25, the stopper plate 49b is in a vertical state and the locking portion provided in the deep portion of the storage chamber 25 is engaged with the stopper plate 49b so that the stopper plate 49b is prevented from moving in the pull-out direction and stored. The slack of the wire 88 when the platform 41 is stored is absorbed by the coil spring 87.

As described above, the tilting mechanism 90 of the platform 41 of the lift device 40 of the present embodiment is such that the runners 7 can be vertically moved up and down on the columns 66 standing on the left and right of the rear portion of the body 22.
No. 0, and the horizontal beam members 98 having hinge plates 93 attached to both ends are connected between the lower end portions of the left and right runners 70, and the front end base portion of the platform 41 is connected to the horizontal beam members 9
8 and the left and right rear ends thereof are suspended by wires 88 of a suspension mechanism 78 provided on the runner 70 to horizontally hold the platform 41. A long hole 91a, 91b for a hinge having a predetermined length
In addition, a plurality of hinge pins 96a, 96b and 97a, 9 are slidably attached to the hinge long holes 91a, 91b in the hinge plate 93 attached to the left and right ends of the horizontal beam member 98.
7b, a tilting mechanism 90 having a hinge structure is formed, and the tilting mechanism 90 is normally provided with the left and right hinge plates 93.
Since the lower edge 93a is provided so as to be held at the position of the dimension L from the lower end 70a of the runner 70, as described above, the left and right runners 70 are lowered and the lower edge 93a of the hinge plate 93 causes the lower edge 93a to fall on the ground GL. By lowering the left and right runners 70 by the dimension L via the tilting mechanism 90 from the state of being grounded to the ground, the pulley 80 of the suspension mechanism 78 is also integrally lowered, and the horizontal movement of the platform 41 is accompanied by the lowering of the pulley 80. Bracket 89 and pulley 8 in the state
The length of engagement of the wire 88 with 0 is varied, the rear end side of the platform 41 is tilted around the front end base, and the platform 41 is grounded at a predetermined angle with the lower end 70a of the runner 70 grounded. It Further, when the runner 70 is lifted, it can be returned to the original horizontal position by raising the runner 70 by the dimension L.

Therefore, with the hinge plate 93 grounded, the runner 70 is lowered and the platform 41
Even when the runner 70 is tilted, the front end base of the platform 41 is still placed on the cross beam member 98, so that the runner 70
The relative angular position with respect to the horizontal beam member 98 due to the descent of the horizontal beam member 98 is always constant.
Since the external force to 0 does not act, the runner 70 can smoothly perform the operations before and after landing, and can smoothly perform the tilting movement and the horizontal movement of the platform 41.

In the tilting mechanism 90 in the above embodiment, the hinge elongated holes 91a,
91b and the hinge pin 96 of the hinge plate 93.
Although a, 96b and 97a, 97b are provided as an example,
For example, the hinge plate 9 is not limited to this.
3, a long hole for hinge may be provided, and a hinge pin may be provided on the runner 70 side.

[0033]

As described above, according to the present invention, even if the runner is lowered and the platform is tilted while the hinge plate is in contact with the ground, the front end base of the platform is placed on the cross beam member. Because it is in a state,
Since the angular position relative to the horizontal beam member is always constant as the runner descends, there is no displacement of the horizontal beam member or external force on the runner.Therefore, the runner's movements before and after landing can be performed smoothly. In addition, it is possible to smoothly perform tilting shift and horizontal shift of the platform.

[Brief description of drawings]

FIG. 1 is a perspective view of a freight vehicle equipped with a lift device.

FIG. 2 is a cross-sectional view of a storage chamber formed in a rear portion of a luggage carrier frame.

FIG. 3 is an overall perspective view of a luggage carrier frame.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a side view of the lift device.

FIG. 6 is a partially cutaway perspective view of left and right runners.

FIG. 7 is a schematic perspective view of a drive unit.

FIG. 8 is a plan view of the platform.

FIG. 9 is a perspective view of the platform in a pulled-out state.

FIG. 10 is a side view of the tilting mechanism of the platform.

11 is a cross-sectional view taken along the line AA of FIG.

FIG. 12 is an explanatory view of the action of the platform tilting mechanism.

13A and 13B are conventional platform tilting devices.

FIG. 14 is another conventional platform tilting device.

[Explanation of symbols]

 21 Cargo Vehicle 22 Body 40 Lifting Device 41 Platform 66 Column 70 Runner 70a Runner's Lower End 71 Runner's Left and Right Side Plates 80 Pulley 88 Wire 90 Tilt Mechanism (Hinge Mechanism) 91a, 91b Hinge Long Hole 93 Hinge Plate 93a Hinge Plate Lower edge 96a, 96b, 97a, 97b Hinge pin 98 Horizontal beam member L Dimension between lower end of runner and lower edge of hinge plate

Claims (3)

[Claims] 1. Runners are vertically movably arranged in columns standing on the left and right sides of the rear end of the luggage box, the lower ends of the runners are connected by a cross beam member, and the front end of the platform is placed on the cross beam member. In a lift device for a freight vehicle having a rear end held by a wire stretched on the runner, a hinge structure capable of vertically sliding a connecting portion between a lower end portion of the runner and a hinge plate provided on a cross beam member. A platform tilting device for a lift device of a freight vehicle characterized by the above. 2. A lower end of a runner constituting the hinge structure and a hinge plate are provided with a plurality of elongated holes parallel to each other in the vertical direction on at least one side, and a plurality of pins are erected on the other side so as to be slidable in the elongated holes. The platform tilting device in the lift device for a freight vehicle according to claim 1. 3. The platform for a lift device for a freight vehicle according to claim 1, wherein the hinge structure holds the lower edge of the hinge plate at a position lower than the lower end of the runner by a predetermined dimension. Tilt device.