JPH0320197Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to a sliding device for footboards installed in automobiles that transport heavy objects, such as bulldozers and road rollers.

[Conventional technology and its problems]

The spacing between the footboards installed on heavy goods transport vehicles must be adjusted according to the heavy goods being loaded and unloaded. With conventional footboards, the spacing was adjusted by pushing the footboards by hand, but the heavy footboards had the disadvantage that they could not be easily moved. For this reason, a slide device has been developed that uses a cylinder to adjust the distance between the footboards (Jitsukai Sho.
63-42041). The footboard sliding device shown in this publication uses a cylinder to adjust the distance between the footboards. The cylinder is connected to the footboard via a drive arm. That is, the cylinder rotates the drive arm, and the drive arm moves the footboard along the rotation axis. This slide device has a drive arm provided on the lower surface of the loading platform, and rotates the drive arm to move the footboard along the rotation axis. In this mechanism, the tip of the drive arm does not move linearly along the rotation axis. When the drive arm is rotated in a horizontal plane, its tip moves along an arcuate trajectory around a point connected to the loading platform. Therefore, in order to connect the drive arm to the footboard, a mechanism is required that converts the arc motion of the drive arm into linear motion along the rotation axis and transmits the same. The conventional slide device realizes this mechanism using a long hole provided vertically through the drive arm and a hanging pin of the footboard. That is, a long hole is provided in the drive arm along the axial direction, and a hanging pin connected to the footboard is inserted into this long hole. FIG. 4 shows the structure of the connecting portion between the footboard 1 and the drive arm 3. As shown in this figure, a hanging pin 8 is connected to the footboard 1 so as to be rotatable in a vertical plane. The hanging pin 8 is inserted into a long hole 9 of the drive arm 3. In the sliding device of this mechanism, when the drive arm 3 is rotated by the cylinder 4, the hanging pin 8 is moved into the elongated hole 9.
Therefore, the footboard 1 can be moved along the rotation axis 2 by the drive arm 3 that moves on an arc. Further, the slide device for the footboard 1 of this mechanism has the feature that the distance between the footboards 1 can be adjusted in a vertical or horizontal position. The length of the hanging pin 8 is adjusted so that it does not come out from the elongated hole 9 when the footboard 1 is in a horizontal position. However, the slide device of this mechanism has a major drawback in terms of traffic safety because the long hanging pin 8 covers a part of the front side of the butt clamp 10 in actual driving conditions. It had a weakness that made it weak. In particular, when the footboard 1 is held horizontally and a heavy object is actually loaded or unloaded, the hanging pin 8 tends to bend easily. The reason why the hanging pin 8 covers the butt clamp 10 is to enable the interval to be adjusted while the footboard 1 is lowered. That is, when the footboard 1 is lowered, the hanging pin 8 is lifted, but even in this position, the hanging pin 8 needs a length that extends to the elongated hole 9. The long hanging pin 8 is in the lowered position when the footboard 1 is standing vertically and running, and partially covers the back clamp 10. In addition, when the footboard 1 is in a horizontal position, the drive arm 3 moves the footboard 1 along the rotation axis 2 via the long hanging pin 8, so there is a drawback that the hanging pin 8 is easily bent in this position. . Especially troubling,
When the footboard 1 is laid down horizontally, the tip of the footboard 1 is often brought into contact with the ground in a posture for loading and unloading heavy objects. In this position, the distance between the footboards 1 is adjusted with the tip of the footboard 1 rubbing against the ground, so it is extremely difficult to move, and a large force is required to adjust the distance between the footboards 1. That is, a large force is applied to the hanging pin 8 in a position where it is easily bent, and an extremely unreasonable force is applied to the hanging pin 8 in terms of strength. In order to make the hanging pin 8 difficult to bend, it may be made thicker. However, the thicker the hanging pin 8 is, the larger the area for hiding the underside clamp 10 is, and from the viewpoint of traffic safety, it is not possible to make the hanging pin 8 thicker. Furthermore, since the elongated hanging pin protrudes for a long time, it is extremely dangerous if a worker hits it, and if an object hits the hanging pin, it will bend and cause problems such as making it impossible to move the footboard.

[Purpose of this idea]

This invention was developed with the aim of solving these drawbacks of the conventional slide device for the footboard 1, and the important purpose of this invention is that even though the back clamp 10 is not hidden at all, To provide a sliding device for a footboard in a heavy goods transport vehicle, which allows the footboard 1 to be moved along a rotating shaft 2 without difficulty.

[Means to solve conventional problems]

The slide device for the footboard 1 in the heavy goods carrier of this invention has the following structure in order to achieve the above object. (a) The slide device includes a footboard 1, a rotating shaft 2, a drive arm 3, and a cylinder 4. (b) The footboard 1 is inserted into the rotating shaft 2 so that it does not rotate relatively but can move freely in the axial direction. (c) The footboard 1 is connected to the tip of the drive arm 3. (d) The drive arm 3 is connected to the loading platform 5 via an intermediate shaft so as to be rotatable within a horizontal plane. (e) The cylinder 4 itself is attached to the loading platform 5, and the tip of the rod is connected to the rear end of the drive arm 3. (f) The footboard 1 is provided with a guide groove 6 along the rotation direction on its outer periphery near where the rotation shaft 2 is inserted. (g) A guide pin 7, which is inserted into a guide groove 6 provided in the footboard 1, protrudes from the tip of the drive arm 3. (h) When the drive arm 3 is rotated in a horizontal plane by the cylinder 4, the guide pin 7 of this drive arm 3
However, the footboard 1 is moved along the rotating shaft 2 using the guide groove 6 to adjust the interval between the footboards 1.

[effect]

The sliding device for the footboards in the heavy goods carrier of this invention configured as described above adjusts the spacing of the footboards 1 in the following conditions. As shown in FIG. 1, the guide pin 7 of the drive arm 3 is guided by the guide groove 6 of the footboard 1. As shown in FIG.
The footboard 1 moves along the rotating shaft 2 with the guide groove 6 being pushed by the guide pin 7. That is, when the drive arm 3 is rotated, the guide pin 7 moves into the guide groove 6.
Push sideways to move the footboard 1 along the rotation axis 2. When the footboard 1 moves along the rotation axis 2,
The guide pin 7 moves along the guide groove 6 in the front-rear direction of the loading platform 5. That is, in the slide device of this invention, the movement of the drive arm 3 in the front-rear direction of the loading platform 5 is absorbed by the guide groove 6 provided in the footboard 1. The footboard 1 moved by this mechanism is reliably moved along the guide groove 6 in any posture. This is because the footboard is not driven by a long hanging pin as in conventional slide devices. In particular, the sliding device for the footboard 1 of this invention has the advantage that even when the footboard 1 is laid down horizontally, the distance can be reliably adjusted using the short guide pins 7. Therefore, even when the tip of the footboard 1 is in contact with the ground, the distance between the footboards 1 can be adjusted reliably and without straining the driving part. Furthermore, a noteworthy feature of the sliding device for the footboard 1 of this invention is that the user can run safely with the footboard 1 upright without covering the front surface of the butt clamp 10. This feature is because there is no need to connect long hanging pins to the footboards, and the interval between the footboards can be adjusted by omitting the hanging pins. In addition, the device that drives the footboard 1 laterally using the guide pin 7 and the guide groove 6 without using a hanging pin that hides a part of the cross clamp 10 can make the guide pin 7 thick and strong, and , the interval between the footboards 1 can be reliably adjusted.

[Preferred embodiment]

An embodiment of this invention will be described below based on the drawings. However, the embodiments shown below are illustrative of a device for embodying the technical idea of this invention, and the device of this invention differs from the material, shape, and shape of the component parts.
The structure and arrangement are not limited to those shown below. Various modifications may be made to the device of this invention within the scope of the claims for utility model registration. Furthermore, in this specification, in order to make it easier to understand the scope of claims for utility model registration, the numbers corresponding to the members shown in the examples are shown in the "column of claims for utility model registration".
Additional notes are added to the members shown in the "Column of Means for Solving Conventional Problems" and the "Column of Functions and Effects."
However, the members shown in the scope of the utility model registration claims are by no means limited to the members of the embodiments. The slide device for the footboard 1 in the heavy goods carrier shown in FIGS. 1 to 3 consists of the footboard 1 and the rotating shaft 2.
, a drive arm 3, and a cylinder 4. There are two footboards 1, and both footboards 1 are inserted through the rotating shaft 2. The footboard 1 is tilted about a rotation axis 2. Therefore, the footboard 1 is inserted through the rotating shaft 2 so that it does not rotate but is movable in the axial direction. The rotating shaft 2 is a square rod and is rotatably supported along the rear edge of the loading platform 5. This rotating shaft 2
is rotated by a rotating cylinder 4 (not shown). As the mechanism for rotationally driving the rotating shaft 2 with the rotating cylinder 4, a conventional mechanism can be used as is. For example, a mechanism can be adopted in which an arm is fixed downward at the center of the rotating shaft 2, the rod end of the cylinder is connected to this arm, and the rear end of the cylinder 4 is connected to the loading platform 5. Rotating axis 2 with cylinder 4
When the footboard 1 is rotated, the footboard 1 is also tilted. Therefore, the footboard 1 is provided with a square hole through which the rotating shaft 2 is inserted. This footboard 1 is connected to the tip of a drive arm 3 so as to be moved along a rotation axis 2. The drive arm 3 is rotatably connected in a horizontal plane to the lower surface of the loading platform 5 via an intermediate shaft. The rear end of the drive arm 3 is connected to a cylinder 4. The cylinder 4 is attached to the loading platform 5 so that it can rotate within a horizontal plane to some extent. The footboard 1 is provided with a guide groove 6 along the rotation direction on the outer periphery of the portion through which the rotation shaft 2 is inserted. The rotating shaft 2 has a portion into which the rotating shaft 2 is inserted and a portion of the guide groove 9 made of metal such as iron so that the rotating shaft 2 has sufficient strength even when the guide pin 7 moves along the guide groove 6. That is, the footboard 1 is connected to the rotation axis 2
The base part that is inserted through is made of iron, and a piece of wood is fixed to this to make the whole body elongated. The guide groove 6 is provided in and around the square hole so that the guide pin 7 is guided there when the footboard 1 is tilted from a horizontal position to a vertical position. The interval between the guide grooves 6 is designed to be somewhat wider than the thickness of the guide pin 7. For example, the thickness of guide pin 7 is 50 mm.
In the case of , it is made to a width of 55 to 65 mm. The tip of the drive arm 3 is connected to a guide pin 7 that is slidably guided in a guide groove 6 provided in the footboard 1.
is fixed and protrudes from the top. The lower end of the guide pin 7 is male-threaded.
The guide pin 7 is screwed into a screw hole drilled in the drive arm 3, or the threaded portion is passed through the drive arm 3 and the lower end is fixed with a nut. When the guide pin 7 is connected to the drive arm 3 in this way, the guide pin 7 can be easily removed. With this structure, the footboard 1 can be easily pulled out from the rotating shaft 2 by removing the guide pin 7.
Therefore, when repairing the footboard 1, etc., there is an advantage that the footboard 1 can be easily pulled out from the rotating shaft 2. In this mechanism, when the drive arm 3 is rotated in a horizontal plane by the cylinder 4, the guide pin 7 of the drive arm 3 moves the footboard 1 along the rotation axis 2 using the guide groove 6, thereby moving the footboard 1 along the rotation axis 2. Adjust the interval of 1. In the footboard sliding device shown in FIG. 3, left and right footboards 1 are driven separately by cylinders 4. In this way, the structure in which the footboards 1 can be moved independently using the two cylinders 4 has the advantage that each footboard 1 can be adjusted independently to the optimum position.

[Brief explanation of drawings]

1 and 2 are cross-sectional views showing the mounting portion of the footboard, FIG. 3 is a bottom view of the mounting portion of the footboard, and FIG. 4 is a cross-sectional view showing the conventional footboard mounting portion. 1... Footboard, 2... Rotating shaft, 3... Drive arm, 4... Cylinder, 5... Loading platform, 6... Guide groove, 7... Guide pin, 8... Hanging pin, 9...
...Long hole, 10...X clamp.

Claims (1)

[Claims for Utility Model Registration] A sliding device for a footboard 1 in a heavy goods transport vehicle, characterized in that the device has the following configurations a to h. (a) The slide device includes a footboard 1, a rotating shaft 2, a drive arm 3, and a cylinder 4. (b) The footboard 1 is inserted into the rotating shaft 2 so that it does not rotate relatively but can move freely in the axial direction. (c) The footboard 1 is connected to the tip of the drive arm 3. (d) The drive arm 3 itself is rotatably connected in a horizontal plane to the loading platform 5 via an intermediate shaft. (e) The cylinder 4 itself is attached to the loading platform 5, and the tip of the rod is connected to the rear end of the drive arm 3. (f) The footboard 1 is provided with a guide groove 6 along the rotational direction on its outer periphery near where the rotational shaft 2 is inserted. (g) A guide pin 7 is provided protruding from the tip of the drive arm 3 to be inserted into a guide groove 6 provided in the footboard 1. (h) When the drive arm 3 is rotated in a horizontal plane by the cylinder 4, the guide pin 7 of this drive arm 3
However, the footboard 1 is moved along the rotation axis 2 using the guide groove 6 to adjust the interval between the footboards 1.