JPH0451071Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a heavy goods carrier that slides footboards from side to side.

(Prior art) Conventionally, as a device of this kind, Japanese Utility Model Application Publication No. 58-3331 discloses a system in which a rotating shaft is installed at the rear end of the loading platform, and the base ends of the left and right footboards are integrally rotated around the rotating shaft. The operating arm is attached so that it can be slid freely along the footboard, and the dowel pin is pivoted to the base of the footboard in a hanging state.The operating arm is connected to a prime mover such as a hydraulic cylinder on the bottom of the loading platform, and the rear end swings left and right in the horizontal direction using the pivot as a fulcrum. A heavy goods transport vehicle is disclosed in which the knock pin is loosely fitted into a long hole opening along the front-rear direction at the rear end of the actuating arm.

Furthermore, in Japanese Utility Model Application Publication No. 58-3335, a rotating shaft is installed at the rear end of the loading platform, and left and right footboards are attached to the rotating shaft so that they can rotate integrally and slide freely along the shaft, and a pair of support arms are mounted on both ends of the shaft. A screw shaft is rotatably suspended parallel to the rotation shaft across both support arms, and a male screw portion consisting of a left-hand screw and a right-hand screw is formed on both sides of the screw shaft, The footboards are formed with female screws that correspond to each male thread, and by screwing the male and female screws together, the footboards are mutually connected to each other around the loading platform by rotating the screw shafts in forward and reverse directions. A sliding device for footboards in a heavy goods transport vehicle is disclosed, in which the footboards can be slid apart from each other or toward each other to change the distance between the footboards.

(Problems to be Solved by the Invention) In the former example, the footboard is slid through the operating arm;
There is a concern that the movement of the footboards may not be smooth due to the link mechanism.

In addition, in the latter conventional example, a male screw part consisting of a right male screw and a left male screw in different directions is formed on both sides of the screw shaft, and each step plate has a female screw part corresponding to the male screw part. This not only complicates the manufacturing process for each of these components, but also
Even though the left and right footboards have the same external shape, there are two types: right-hand screw and left-hand screw. It is difficult to attach and has poor assembly workability, and since the left and right footboards are not mutually compatible, it is impossible to standardize parts, which is disadvantageous in terms of cost. In addition, sand and mud from bulldozers on the loading platform and civil engineering work vehicles that are backing up can adhere to the screw shaft, and the sand and mud can get caught between the screw shaft and the footboard, hindering the movement of the footboard. Furthermore, since the screw shaft rotates up and down via the support arm in conjunction with the rotation of the rotating shaft, it is not recommended to directly attach a driving means for rotating the screw shaft in forward and reverse directions to the screw shaft. In addition, since it cannot be attached to the loading platform side, it is necessary to attach a separately prepared drive means to the screw shaft each time the screw shaft is rotated, and to operate this drive means, which is a cumbersome task. However, it is also inconvenient that the driving device must be carried around at all times.

This invention solves the above-mentioned problems, and not only allows the stepboard to slide smoothly, but also improves the manufacturing process and assembly workability by standardizing parts, and is a heavy object with excellent operability. The purpose is to provide transportation vehicles.

[Structure of the invention] (Means for solving the problems) The present invention consists of a rotating shaft installed at the rear of the loading platform, and a pair of left and right components that rotate integrally with the rotating shaft and are slidably guided along the rotating shaft. a footboard, a fixed plate protruding from the base end of the footboard, a connecting member slidably engaged with an arc-shaped hole provided in the fixed plate, and a connecting member connected to the footboard through this connecting member. The vehicle is provided with an annular operating cable connected to the platform, and a drive device attached to the cargo platform and moving the operating cable forward and backward to slide the footboard.

(Function) When the left and right footboards move up and down due to the rotation of the rotating shaft, the connecting member of the operating rope slides along the hole in the fixed plate provided at the base end of the footboard. Thereafter, by activating the drive device and moving the operating cable, the footboard slides via the connecting member.

(Embodiment) Figures 1 to 4 show a first embodiment, in which 1 is a transport vehicle in which front wheels 3 and rear wheels 4 of a chassis frame 2 are pivoted, and a driver's seat 5 is provided in the front part. It is the main body. Reference numeral 6 denotes a loading platform made of a single flat plate on which a heavy object 7 fixedly fixed to the upper surface of the chassis frame 2 is loaded, and support legs 8 are provided on both sides of the front of the loading platform 6. The upper end of this support leg 8 is connected to a piston rod 9A of a hydraulic cylinder 9 for lifting and lowering, which is a lifting drive device fixedly installed on both sides of the loading platform 6. The support legs 5 and the lifting hydraulic cylinder 9 are tilted forward so that they are substantially perpendicular to the ground when the platform 6 tilts backward.

Reference numeral 10 denotes a rotating shaft installed on the rear edge of the loading platform 6, and its end is rotatably connected to a mounting seat 11. The base end is fixed to a link arm 12 at the center of the rotating shaft 10, and the tip of a piston rod 13A of a rotating hydraulic cylinder 13 whose base end is pivoted to the lower part of the chassis frame 2 is attached to the link arm 1.
The rotating shaft 10 rotates as the piston rod 13A extends and retracts. Also, the rotating shaft 10
U-shaped stoppers 14 having a sliding length are fixedly installed on both sides.

Reference numeral 15 denotes one footboard provided on one side of the rotating shaft 10 so as to rotate integrally with the rotating shaft 10 and to be slidable along the rotating shaft 10.
A square groove 16 is provided on the back surface of the proximal end side of the fixing member, through which the rotating shaft 10 is inserted and into which the stopper 14 is engaged. Piece 18 is inserted and secured to the proximal end of footboard 15 by bolts 19. Therefore, the footboard 15 can rise and fall as the rotating shaft 10 rotates. Further, a fixed plate 21 having a hole 20 formed in an arc shape is protrudingly provided on the back surface of the proximal end of the step board 15. A connecting member 22 to which an operating cable, which will be described later, is connected is slidably provided in the hole 20. Further, on the other side of the rotating shaft 10, another footboard 23 is similarly provided so as to rotate integrally with the rotating shaft 10 and to be slidable along the rotating shaft 10.

Reference numeral 24 denotes a sliding hydraulic cylinder which is a driving device for sliding the footboards 15 and 23, and is fixed to the chassis frame 2. At the tip of the piston rod 24A, there is a slide 2 which is stacked in four stages.
5 is attached to the shaft. 26 has one end fixed to the rear side of the chassis frame 2 and the other end fixed to the first chassis frame 25A.
Connecting member 22 provided on one footboard 15 via
A first operating rope such as a wire rope fixed to one side, and 27 has one end fixed to the front side of the chassis frame 2 and the other end connected to the other side of the connecting member 22 via the second sheep 25B. This is a fixed second operating cable, and these first and second operating cables 26 and 27 are arranged in an annular manner via a guide roller 30 that is pivoted to the chassis frame 2. Reference numerals 28 and 29 indicate third and fourth operating ropes connected to the other footboard 23 via third and fourth sheeps 25C and 25D.

Next, the operation of the above structure will be explained.

When loading a heavy object 7, the support legs 8 are extended by the hydraulic cylinder 9 for raising and lowering, and the loading platform 6 is tilted backward. When the rotating hydraulic cylinder 13 is actuated to retract the piston rod 13A, the rotating shaft 10 is rotated by the link arm 12 in the direction of the arrow.
Therefore, the engagement between the stopper 14 and the groove 16 causes the footboards 15, 23 to rotate. Thereafter, in order to slide the footboards 15, 23 inward according to the width of the heavy object 7, the sliding hydraulic cylinder 24 is operated to retract the piston rod 24A. For this reason, the first
The second operating cable 26 is pulled, and the second operating cable 27 is let out, and an inward force is applied to the connecting member 22, allowing one footboard 15 to move inward. Similarly, the fourth operating cable 29 is pulled, the third operating cable 28 is let out, and the other footboard 23 can also be moved inward. Incidentally, in order to move the footboards 15, 23 inward, the piston rod 24A may be extended.

As described above, the first and second operating cables 26 and 27 are connected in an annular manner toward both sides of the base ends of the footboards 15 and 23, and furthermore, the first and second operating cables 2
A sliding hydraulic cylinder 24 is connected to the piston rods 6 and 27, so that the footboards 15 and 23 can be slid in response to the movement of the piston rod 24A.
Therefore, the movement of the piston rod 24A of the sliding hydraulic cylinder 24 and the movement of the footboards 15, 23 become linear, allowing smooth sliding.

Furthermore, in the present invention, there is no need to prepare two types of footboards, one for right-hand screws and one for left-hand screws, as in the conventional example, and it is possible to use footboards 15 and 23 of the same configuration on the left and right sides, and parts By standardizing the
The manufacturing process can be simplified, and the left and right footboards can be easily assembled.

In addition, since the slide hydraulic cylinder 24 serving as the drive device is directly attached to the loading platform 6, the footboard 1
There is no need to install a drive device each time 5 or 23 is slid, resulting in excellent operability. Furthermore, loading platform 6
Since it is a single plate-shaped product, that is, it does not involve welding multiple plates, it does not cause distortion and has excellent flatness.

5 and 6 show a second embodiment,
A rotating shaft 10 is installed on the rear edge of the loading platform 6, and footboards 15 and 23 are rotatably and slidably provided on both sides of the rotating shaft 10. First and second operating cables 26 and 27 are connected to the fixed piece 22 of one footboard 15 toward both sides. Said first working rope 26
has one end connected to the inside of the chassis frame 2, and the other end connected to the fixed piece 18 via the first sheep 25A.
It is stuck to one side. The second operating cable 27 has one end connected to the outside of the chassis frame 2, and the other end connected to the other of the fixed pieces 18 via the second sheep 25B. The first and second sheeps 25A and 25B are pivotally connected to a piston rod 24A of a horizontally oriented first sliding hydraulic cylinder 24B. Similarly, third and fourth operating cables 28 and 29 are connected to the fixed piece 18 of the other footboard 23, and these third and fourth operating cables 28 and 29 connect to the horizontal second sliding hydraulic cylinder. 24C
The vehicle is suspended from the third and fourth sheeps 25C and 25D.

Therefore, the first sliding hydraulic cylinder 2
When moving forward or backward on 4B, one footboard 15 can be slid inward or outward. Similarly, when the second sliding hydraulic cylinder 24C is moved back and forth, the other footboard 23
can be slid inward and outward. By providing the pair of footboards 15, 23 with the first and second sliding hydraulic cylinders 24B, 24C, each footboard 15, 23 can be slid independently, and the footboards 15, 23 can be slid independently. 23 can be moved to one side of the loading platform 6, and the applicability can be widened.

Note that the present invention is not limited to the above-mentioned embodiment, and for example, as shown in FIG. A tension adjustment device may be provided at the rear end of the chassis frame, and although the embodiment shows a rotating shaft provided at the rear end of the chassis frame, various modifications are possible, such as a rotating shaft may be provided at the rear end of the chassis frame. It is.

[Effects of the invention] The present invention consists of a rotating shaft installed at the rear of the loading platform, a pair of left and right footboards that rotate integrally with the rotating shaft and are slidably guided along the rotating shaft, and the base end of the footboards. a fixing plate protruding from the fixing plate; a connecting member slidably engaging an arc-shaped hole provided in the fixing plate;
By comprising an annular operating rope connected to the footboard via the connecting member, and a drive device attached to the loading platform that advances and retreats the operating rope and slides the footboard, It is possible to provide a heavy goods transport vehicle that allows plates to slide smoothly, improves manufacturing process and assembly workability by standardizing parts, and has excellent operability.

[Brief explanation of drawings]

Figures 1 to 4 show the first embodiment, where Figure 1 is a perspective view, Figure 2 is a front view, Figure 3 is a perspective view of the main part, and Figure 4 is a sectional view of the main part. , FIG. 5 is a plan view of the second embodiment, FIG. 6 is a perspective view thereof, and FIG. 7 is a perspective view of the third embodiment. 6... Loading platform, 10... Rotating shaft, 15, 23...
Step board, 20... hole, 21... fixed plate, 24...
Hydraulic cylinder for slide (drive device), 26,
27, 28, 29... Working rope.

Claims (1)

[Scope of utility model registration request] a rotating shaft installed at the rear of the loading platform; a pair of left and right footboards that rotate integrally with the rotational shaft and are slidably guided along the rotational shaft; and a fixed plate protruding from the base end of the footboards; A connecting member that is slidably locked in an arc-shaped hole provided in the fixed plate, an annular operating cable that is connected to the footboard via this linking member, and an operating cable that is attached to the loading platform. and a drive device that slides the footboard by advancing and retracting the footboard.