JPH0534452Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to a freight vehicle in which a part of the loading platform is provided with a lift floor that can be raised and lowered, and this lift floor is suspended by a lifting mechanism. It is something.

(Prior Art) Conventionally, for example, in this type of freight vehicle equipped with an aluminum van-type cargo box, an opening is provided in the floor plate at the rear of the cargo box, and the chassis frame below this opening is removed, and the chassis frame is inserted into the opening. In addition to providing a lift floor that can be raised and lowered, the lift floor is suspended by a chain, and the chain is raised and lowered using a cylinder or the like to raise and lower the lift floor. Loading and unloading of cargo is carried out by placing the cargo on the platform and raising and lowering it. However, since the lift floor of such a truck is provided inside the cargo box, when the cargo box is fully loaded with cargo, the cargo vehicle must be driven with the cargo also loaded on the lift floor. However, so that the lift floor can be raised and lowered, the chassis frame below it has been removed, and the only thing that supports the lift floor is the suspended chain, so vibrations may occur during travel. There was a problem in that a considerable load was applied to the chain, making it easy to break.

In order to solve such problems,
Publication No. 74739 discloses that an elevating type rear end that functions as a lift floor is hung from the rear of a loading platform so as to be able to rise and fall freely, and an auxiliary joist that supports this elevating type rear end in the raised position is a chassis frame. An elevating type rear end of a freight vehicle has been proposed, which has a main body that can move forward and backward.

(Problem to be solved by the invention) In the above-mentioned conventional elevating rear end section, when the elevating rear end section is used, the auxiliary joist is stored in the front position of the loading platform, and the auxiliary joist is slid from here to the rear end position of the loading platform. Because it supports the rear end of the elevating type,
The problem is that the movement stroke of the auxiliary joist is required to be at least equal to the length of the rear end of the lifting type, and the auxiliary joist is also long, and the driving means for driving the auxiliary joist is also large. In addition, since the auxiliary joist comes and goes in a long stroke along the lower surface of the center side of the rear end of the lift, a trochanter or the like is installed on the lower surface of the lift floor to facilitate the advancement and retreat of the auxiliary joist. Therefore, there was a problem that the structure of the rear end of the elevating type was complicated. Furthermore, since the center of the rear end of the lift is supported by an auxiliary joist, if the load is on one side of the rear end of the lift, the other side of the rear end of the lift may lift up. There was an aspect of instability. Moreover, when the lift-type rear part is raised or lowered, the auxiliary joists are stored in front of the loading platform, so there is no chassis frame to support the rear of the loading platform, making it unsuitable for raising and lowering heavy objects.

Therefore, the present invention has been developed based on the above-mentioned problem, and can reduce the burden on the lifting mechanism of the lift floor while traveling, prevent damage, and also allows the support part to move in a short stroke to raise and lower the lift floor. The object of the present invention is to provide a freight vehicle that can stably support parts of the vehicle and that has a simple structure.

[Structure of the invention] (Means for solving the problem) The invention fixes the loading platform on the chassis frame,
A pair of left and right rear chassis frames are provided at the rear of the chassis frame, and a lift floor section that can be raised and lowered through between the left and right rear chassis frames is provided at the rear of the loading platform, and a corner of the lift floor section is provided at the rear of the loading platform. A pillar is erected at a corner, and this pillar is suspended by a lifting mechanism, and the floor surface of the loading platform and the lift floor are placed on the same plane at the raised position of the lift floor, and the lift in this raised position is In the freight vehicle, a support part for supporting a floor part is slidably provided on the chassis frame, and the lower part of the support pillar is fixed to the left and right side surfaces of the lift floor part, and the support part is attached to the inside of the rear chassis frame. A slide frame that can be slid forward and backward is provided in the rear chassis frame, and a driving means for sliding the slide frame is provided, and the right and left side surfaces of the lift floor are provided on the upper part of the slide frame. The supporting portion is movable along the support portion and has an inclined surface on its upper surface that engages with the lower end of the support column.

(Function) When raising and lowering the lift floor, the slide frame is slid so that the supports of the lift floor can be inserted into the grooves of the rear chassis frame, and the lift floor is raised and lowered. On the other hand, when the lift floor is raised, the drive means slides the slide frame and moves the support parts provided on the slide frame along the left and right sides of the lift floor, and the sloped surface of the support part is moved along the left and right sides of the lift floor. It engages with the lower end to support the corner side of the lift floor.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings. In Figures 1 to 4, reference numeral 1 is, for example, an aluminum van-type packing box, which has an opening 2 at the rear for loading and unloading cargo, and an opening/closing door (not shown) is attached to this opening 2. . A floor opening 4 communicating with the opening 2 is formed near the rear of the floor 3 of the cargo box 1. Further, the cargo box 1 is mounted on a front chassis frame 5 provided near the center of the vehicle body. This front chassis frame 5 supports the floor surface 3, and has left and right side chassis frames 6 extending from its rear end, and this side chassis frame 6 has a rear chassis frame located outside the floor opening 4. 7 has been extended. After this, there is a groove 8 on the inside of the chassis frame 7 through which a support column (to be described later) can be inserted.
is formed.

Reference numeral 9 denotes a lift floor part which is movable up and down so as to close the floor opening 4, and since no chassis frame is provided below it, it can be lowered to the ground. Upright columns 10 are provided on this lift floor section 9 and can be inserted through grooves 8 formed in the rear chassis frame 7, and the lower portions of these columns 10 are fixed to the left and right side surfaces of the lift floor section 9. .
One end of a chain 11 is fixed to the upper end of these supports 10, and these chains 11 are hung around a pulley 13 and a movable pulley 14 that are rotatably pivoted to the frame body 12 of the cargo box 1, and the other end of the chain 11 is A piston rod 16 of a cylinder 15 for raising and lowering the lift floor 9 disposed on the front chassis frame 5 below the cargo box 1.
The lift floor part 9, which is fixed to the chain 11 and suspended from the chain 11, is moved up and down between the ground and the floor surface 3 by the action of the cylinder 15. Further, the support column 10 is provided outward from the side surface of the lift floor section 9, and has a tapered surface 17 at its lower end. Furthermore, a ground plate 18 is pivotally attached to the lift floor 9 so as to be rotatable. In addition, a support column 1 is included in the cargo box 1.
A guide tube 12A is provided to guide 0.

A side frame 19 is provided on the rear chassis frame 7 and constitutes a part of the rear chassis frame 7, and a groove 20 is formed at the same position as the groove 8. Reference numeral 21 denotes a slide frame that is provided so as to be slidable in the front and back direction within this side frame 19, and the support column 10 of the lift floor section 9 is attached to the upper end of the slide frame.
A support portion 22 is provided to support the. A tapered surface 23 having the same slope as the tapered surface 17 is formed on the upper surface of the support portion 22 .
This slide frame 21 has a slide cylinder 24 fixed to the rear chassis frame 7.
It is connected to the piston rod 25 of the piston rod 25 by a mounting body 26, and slides within the side frame 19 that constitutes a part of the rear chassis frame 7 by the action of the cylinder 24, and when the lift floor part 9 rises to the floor surface 3, the When the frame 21 is slid and the support section 22 is positioned in the groove 20, the tapered surface 17 of the column 10 is placed on the tapered surface 23 of the support section 22, and the lift floor section 9 is supported by the rear chassis frame 7. It is configured so that In addition, the side frame 19 guides the slide frame 21 and is arranged between the rear chassis frame 7 and the cargo box 1 to compensate for the storage height of the elevating mechanism 27 such as the elevating cylinder 15, pulley 13, and chain 11. is provided in between.

The operation of the present invention constructed as above will be described in detail below. First, in order to raise and lower the lift floor part 9, as shown in FIG. 3B, a sliding cylinder 24 is used.
, and move the slide frame 21 forward to remove the support part 22 from the groove 20. This results in
The groove 20 is opened, and by expanding and contracting the lifting cylinder 15, the lift floor section 9 suspended from the chain 11 is raised and lowered, and cargo is loaded and unloaded. At this time, the pillars 10 of the lift floor 9 are connected to the grooves 8 and 2.
0 and guide tube 12A, it moves up and down smoothly.

On the other hand, when the cargo handling work is completed, the lift floor section 9 is moved to the floor surface 3.
After raising it to the height, the slide cylinder 24
When the slide frame 21 is retracted, the slide frame 21 moves rearward as shown in FIG.
The lower end of the support column 10 is placed on the support part 22 while closing the upper part. At this time, the support part 22 and the support column 10
Since tapered surfaces 23 and 17 are formed at the lower ends of the support portions 22 and 17, the supporting portions 22 are attached to the support columns 10 when sliding.
This causes the load of the lift floor section 9 to be applied to the rear chassis frame 7 through the slide frame 21 and the side frame 19. Therefore, when the vehicle is running, the lift floor portion 9 is supported by the rear chassis frame 7.
The load of the lift floor part 9 is hardly applied to the chain 11, and damage such as breakage of the chain 11 due to vibration during traveling can be prevented.

In this way, by supporting the rear chassis frame 7 by the slide frame 21 when the lift floor section 9, which can be raised and lowered, is raised, the burden on the lifting mechanism 27, such as the chain 11, during traveling can be reduced.

In addition, the pillars 1 erected at the corners of the lift floor section 9
0 is supported by the support part 22, and thereby the corner part side of the lift floor part 9 is supported by the support part 22.
2 to stably support the lift floor part 9, and a slide frame 21 that can freely slide back and forth within the side frame 19 that constitutes a part of the rear chassis frame 7 is provided. Since the frame 21 is provided with the support part 22 which is movable along the left and right side surfaces of the lift floor part 9 and has a tapered surface 23 on the upper surface which is an inclined surface that engages with the lower end of the support column 10, the support part 22 Pillar 1
It is only necessary to move along the side surface of the lift floor part 9 by the stroke for engaging and disengaging with the slide frame 21, and the cylinder 24, which is the driving means for slidingly driving the slide frame 21, can also be small, which reduces the size of the device. In addition, the structure becomes relatively simple. Further, a pair of left and right rear chassis frames 7 is provided, and a lift floor portion 9 that can be raised and lowered through between the left and right rear chassis frames 7.
is provided at the rear of the cargo box 1, which is a loading platform, so even if the load of the lift floor section 9 is applied to the rear of the cargo box 1 during lifting or lowering, the rear chassis frame 7 supports this, and only the rear side of the cargo box 1 is supported. It is possible to stably move up and down the lift floor part 9 on which heavy objects are placed without applying an unreasonable load.

Above, one embodiment of the present invention has been described in detail.
It can be modified as appropriate within the scope of the gist of the present invention. For example, in the above embodiment, a chain was used to suspend the lift floor, but a belt or the like may also be used, and instead of a lifting cylinder, a chain hoisting mechanism may be used to raise and lower the lift floor. These elevating and lowering mechanisms can be modified as appropriate.

[Effects of the invention] As detailed above, according to the invention, the loading platform is fixed on the chassis frame, a left and right pair of rear chassis frames are provided at the rear of the chassis frame, and the left and right rear chassis frames are provided at the rear of the chassis frame. A lift floor section that can be raised and lowered by passing between the rear chassis frames is provided at the rear of the loading platform, and columns are erected at the corners of the lift floor section, and these columns are suspended by an elevating mechanism, so that the lift floor section can be raised and lowered. In a freight vehicle, the floor surface of the loading platform and the lift floor are arranged on the same plane in a raised position of the cargo vehicle, and a support part for supporting the lift floor in the raised position is slidably provided on the chassis frame, fixing the lower side of the support to the left and right sides of the lift floor;
A groove through which the support column can be inserted is provided inside the rear chassis frame, a slide frame that is slidable back and forth is provided in the rear chassis frame, and a driving means for sliding the slide frame is provided, and a drive means for sliding the slide frame is provided. By providing the support part on the upper part that is movable along the left and right side surfaces of the lift floor part and has an inclined surface on the upper surface that engages with the lower end of the support column, the lift floor part can be raised and lowered while traveling. It is possible to reduce the load on the mechanism, prevent damage, and to provide a truck with a simple structure in which the support part can move with a short stroke to stably support the lift floor part.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main parts showing one embodiment of the present invention, Fig. 2 is a schematic explanatory diagram showing the operation, Fig. 3A,
B is a sectional view showing the operation, and FIG. 4 is a plan view showing the chassis frame. 1... Loading box (loading platform), 7... Rear chassis frame, 8... Groove, 9... Lift floor, 10... Support column, 19... Side frame (rear chassis frame), 20... Groove , 21...slide frame,
22...Support part, 23...Tapered surface (slanted surface),
24... Cylinder (driving means), 27... Lifting mechanism.

Claims (1)

[Scope of utility model registration request] A loading platform is fixed on a chassis frame, and a pair of left and right rear chassis frames are provided at the rear of the chassis frame, and a lift floor that can be raised and lowered is installed between the left and right rear chassis frames. A support is provided at the rear, and a support is erected at a corner of the lift floor, and the support is suspended by an elevating mechanism, so that the floor surface of the cargo platform and the lift floor are at the same level at the raised position of the lift floor. In a freight vehicle, in which a support part that is arranged on a plane and supports the lift floor part in the raised position is slidably provided on the chassis frame, the lower part of the support column is fixed to the left and right side surfaces of the lift floor part, A groove through which the support column can be inserted is provided inside the rear chassis frame, a slide frame that is slidable back and forth is provided in the rear chassis frame, and a driving means for sliding the slide frame is provided, and a drive means for sliding the slide frame is provided. A lorry vehicle, characterized in that the support part is provided on the upper part, the support part being movable along the left and right side surfaces of the lift floor part and having an inclined surface on the upper surface that engages with the lower end part of the support column.