JP3035567U - Step board device for heavy goods vehicles - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] An automatic folding and storing device that is divided into two parts in the front-rear direction, and there is no risk of being caught on the wire when loading or unloading heavy objects, and repair or replacement work is possible. (EN) Provided is a step board device for a heavy goods transport vehicle, which is a kit that can be easily implemented once. SOLUTION: A front walk board 1 and a rear walk board 2 are folded and housed in a mountain fold shape with a butterfly portion 3 as a hinge so that they can be housed. A wire rope 16 is rotatably supported on the left and right of the surface of the mounting plate 30 that is detachably formed at the rear end, and is tensioned when the front and rear step plates 1 and 2 are extended.
The butterfly cylinder 3 is stretched along the side surfaces of the front and rear step plates 1 and 2, and the lifting cylinder 8 is mounted on the mounting plate 30 side and the front step plate 1.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention is a step board device that is used by stacking a heavy machine (vehicle) such as a bulldozer or an excavator on and off a vehicle deck of a transport vehicle by inclining it over the deck and the road surface. The present invention relates to an improvement of a walking board device for a heavy goods transport vehicle which can be automatically folded and stored by being divided into two parts.

[0002]

[Prior art]

 In the conventional walking board device of this kind, as described in Japanese Utility Model Publication No. 57-15065, a walking board is provided at the end joining position so that it can be folded and housed in a mountain fold shape, and at the same time, the walking board can be stored. It is equipped so that it can be rotated at the rear end of the vehicle deck. While keeping the center of gravity of the walk board low when storing it for stability, its full length when extended is at the storage height By making it twice as long as a long one, the inclination angle of the walking board during use can be made gentle, and for example, the work of stacking and loading heavy items such as bulldozers and excavators can be improved. In this conventional technology, a wire rope is stretched over the front side of the step board and on the vehicle loading deck of the carrier to force the folded front and rear step boards into a straight line when the step board is used (when extended). That was configured to There was.

However, in the above-mentioned conventional technique, one end of the wire is mounted on the deck, and therefore, there is a high possibility that the heavy object will be caught on the wire at the time of stacking and unloading the heavy object. There was also a risk of misdirection of heavy objects during cutting, stacking, and unloading work. Moreover, since the step board device is inseparably integrated with the rear end of the vehicle deck, it takes a long time to finish mounting the device on the rear end of the deck, and there is a problem of work space and manufacturing cost during that time. is there. Also, since the structure is inseparable, if the damage is to the rotating shaft that supports the step plate or its supporting plate, the replacement work is drastic.

[0004]

[Problems to be solved by the device]

 The present invention has been made in view of the above problems of the prior art, and an object thereof is to automatically fold and store in two parts in the front-rear direction and to stack a heavy load. ， Providing a step board device for heavy goods vehicles that has no risk of being caught on the wire during loading and unloading work and that can be easily repaired and replaced in one operation.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the technical means made by the present invention is divided into a front step board and a rear step board in the front-rear direction, and a butterfly portion is provided at the end butting position to form a mountain fold shape. A step board device which is composed of left and right step boards which can be folded and stored, and which can be rotated back and forth in a rearward direction of a vehicle deck and can be moved in an extended shape and a mountain fold shape by a lifting cylinder. The left and right front walking board base ends are pivotally supported on the left and right sides of the mounting plate surface that is detachably formed at the rear end of the vehicle deck, and the wire rope that becomes tension when the front and rear walking boards is extended is It is characterized in that it is stretched along the side surface of the front and rear step board through the butterfly part, and the lifting cylinder is mounted on the mounting plate side and the front step board.

[0006]

[Embodiment of the invention]

 1 to 3 illustrate one embodiment of the step board device of the present invention mounted on a heavy goods carrier. The step board device A in a kit is a trailer, a dump loader, a self-loader, etc. It is detachably provided at the rear end of the vehicle deck b of the well-known transport vehicle B of FIG. The mounting plate 30 in the step board device A is formed in an appropriate shape that can be mounted on the rear end surface b1 of the vehicle deck b, for example, a long rectangular shape. Specifically, the rear end surface b1 of the vehicle deck b is bolted. It is detachably held by tightening and fixing with 33 ... and nuts. Then, on the surface of the mounting plate 30, a pair of left and right support plates 11 and 11a are provided in a half area and a pair of left and right support plates 11 and 11a are provided in the other half area with the approximate center position as a boundary. The step plates a and a are juxtaposed at the right and left positions of the rear end surface b1 of the vehicle deck b, that is, the left and right positions of the mounting plate 30 so as to project perpendicularly from the surface of the mounting plate. Hereinafter, one walk board a will be described, but the other walk board a arranged in parallel also has the same configuration, and the same portions are denoted by the same reference numerals and the description thereof is omitted.

The walk board a has, for example, a predetermined width, and is formed to have a length that shows the maximum regulated height when it is erected at the rear end position of the deck b, and the walk board a. It is formed to have the same width and the same length as the plate 1, and the bottom face of the tip is formed into an inclined shape to form a two-part configuration with a rear walk plate 2 having a ground contact surface 2d, and their end portions 1a. , 2a are provided with butterflies 3 at the abutting positions, the plates 1 and 2 are connected to each other, and the plates can be bent from a half-folded state to a straight state.

The walk board a can be rotated back and forth by pivotally attaching the base end side of the front walk board 1 to the walk board support portions 11 and 11 a projectingly provided on the surface of the mounting plate 30 via the support shaft 12. The walking boards a are provided in pairs at the same level positions on the left and right portions of the mounting plate 30 in accordance with the left and right crawler (endless track) intervals of a heavy load (not shown) such as a bulldozer. . The step board a is not limited to a well-known material such as a steel material that can withstand the weight of heavy objects such as a bulldozer. Further, the length of each step board a, a may be any length as long as the height when standing upright at the rear end position of the deck b is within the maximum regulation height range. Both plates 1 and 2 may have the same length, or one of them may have a long shape and can be appropriately selected.

The butterfly portion 3 has a butting position between the end portions 1a and 2a of the front walk plate 1 and the rear walk plate 2, for example, a lower surface 1c upper left and right position near the end 1a of the front walk plate 1 and the rear walk plate 2. Of the lower surface 2c closer to the end 2a of the lower end 2a of the lower end of the lower surface 2c, and the tips of the protruding pieces 4, 4 and 5, 5 protruding from each other so as to face each other. Shafts 6 which are rotatably inserted through the insertion holes 4a, 4a and 5a, 5a formed on the same line, respectively, and the projecting pieces 4, 4 and 5, 5 have upper ends 4b, 4b and 5b, 5b are formed so as to be at the same level as the edge level of the respective end portions 1a, 2a (see FIG. 2). The 2a are connected so that they can be bent until they abut each other and form a straight line.

Further, in this embodiment, a rope sliding portion 7, for example, a pulley, which allows a wire rope 16 to be described later to slide along the outside of the butterfly portions 3, 3 located inside when the step boards a, a are provided, is provided. Is equipped with. Although the pulley 7 in the illustrated example is not provided with a circumferential groove for guiding the wire rope 16, it may be provided with a circumferential groove for preventing displacement and is appropriately set. Further, the shaft 6 constituting the butterfly portion 3 may be made to project to the outside of the projecting piece 4, and a rope sliding portion may be formed via the peripheral surface portion of the projecting shaft 6, which is arbitrary and is not limited. Not something.

In the present embodiment, for example, the walk plate lifting cylinder 8 is configured to be provided over the mounting plate 30 and an arbitrary position on the side surface 1b of the front walk plate 1, and the walk plate lifting hydraulic cylinder 8 is Are separately provided on the respective walk boards a, a located at. That is, of the step board supporting portions 11 ... Which are provided so as to project orthogonally to the mounting board 30, the step board supporting portions 11a located inside are integrated with the step board supporting portions 11a and protrude more than the step board supporting portions 11a. A shaft 14 walks between the extended cylinder support portion 13 and a cylinder support portion 13a which faces the cylinder support portion 13 and projects from the deck rear end surface b1 on the inner side thereof. One end 9 of a plate lifting cylinder 8 is pivotally attached, and a tip 10a of a piston rod 10 is fixedly provided above the side surface 1b of the front walk plate 1. In the figure, reference numeral 15 is a cover for the step board lifting cylinder 8, the lower end side of which is pivotally mounted together with one end 9 of the cylinder 8 by a shaft 14.

Therefore, the walking board lifting cylinder 8 is provided with its one end 9 and the tip 10a of the piston rod 10 positioned at a position slightly rearward of the walking board supporting portion 11 position. Further, in the present embodiment, the lifting hydraulic cylinders 8 and 8 are provided inside the step boards a and a, respectively, but may be appropriately set to be provided at the outer positions of the step boards a and a, respectively.

The wire rope 16 passes through the butterfly portion 3 from the side surface 1 b of the front step board 1 so as to be in a tension state when the front step board 1 and the rear step board 2 are stretched in a straight line. It is assumed that the wire rope 16 is stretched on the side surface 2b of the step board 2, and in this embodiment, one end 16a of the wire rope 16 is fixed to a mounting piece 15a protruding from the side surface of the cylinder cover 15, and is positioned lower than the mounting piece 15a. Along the rope sliding portion 17 provided on the side surface 1b of the front walking board located at, and along the rope sliding portion 18 located above the attachment piece 15a, and then the rope sliding portion 7 provided on the butterfly portion 3. After passing through, the rope slide portion 19 provided on the side surface 2b of the rear walking board 2 is attached, and finally the other end 16b is fixed to the mounting piece 2e projecting on the side surface 2b of the rear walking board 2 and each of them is fixed. Rope sliding part 7,17,1 8 and 19 are slidably stretched.

Further, the rope sliding portion 7 provided on the butterfly portion 3 and the rope sliding portions 17, 18 and 19 provided on both the plates 1 and 2 have been described by using the pulleys in the present embodiment, but are not limited thereto. However, the wire rope 16 is not limited to a rotatable structure as long as the wire rope 16 can be slidably guided, and a fixed type may be used as long as the peripheral surface can slide. It is a thing. Further, the circumferential grooves 34 provided in each rope sliding portion 17 are optional. Therefore, the wire rope 16 is always located on the side surfaces 1b and 2b of the step board a, and not on the vehicle deck b, regardless of whether the heavy object is stacked or unloaded.

The use state of the step board device A of this embodiment will now be described. The attachment plate 30 of the device A is attached and fixed to the deck rear end surface b1 with bolts 33 ... And nuts. When the step board a is installed between the vehicle deck B and the road surface in an inclined state to stack and unload heavy objects, first, the step board lifting cylinder 8 is lowered to operate the piston. When the rod 10 is contracted, in accordance with the contraction operation of the rod 10, the front walking plate 1 rotates and descends with the base end side on which the front walking plate 1 is pivoted as a fulcrum, and the lower walking plate 2 causes the butterfly plate 3 to move. The wire rope 16 is pulled by its own weight around the center, and the rear walk plate 2 is forcibly rotated about the butterfly portion 3 in the direction of the butting of the end portions 1a, 2a. Then, when the end portions 1a, 2a of the front walk plate 1 and the rear walk plate 2 are abutted against each other, both the plates 1 and 2 are configured in a straight line, and the tip ground contact surface 2d of the rear walk plate is the road surface. Grounded.

When the step board a is lifted by the step board lifting cylinder 8, the front step board 1 is rotated and lifted with the base end side on which the front step board 1 is pivoted as a fulcrum according to the lifting operation. By the ascending operation, the rear walking board 2 is deployed by its own weight around the butterfly portion 3, and the tip thereof rises together with the front walking board 1 while being folded around the butterfly portion 3 so that the ground contact surface 2d side faces the front walking board 1 side. At the rear position of the vehicle deck b, both plates 1 and 2 are erected in a half-folded state around the butterfly part 3.

Therefore, if the configuration of this aspect is adopted, the mounting on the deck rear end surface b1 is easy, and the bolts 33 are removed to release the contact state between the mounting plate 30 and the deck rear end surface b1. For example, since the walk board device A can be integrally removed from the vehicle B, the work of the walk board device A can be facilitated in the repair and replacement work.

FIGS. 4 to 8 illustrate another embodiment of the step board device according to the present invention. In this aspect, an automatic lifting mechanism for the step boards a and a shown in the aspect of FIG. 1 is used. At the same time, it is a kit type equipped with an automatic interval adjusting mechanism for the steps a and a.

For example, as an example, supporting portions 20 and 21 are respectively provided at desired intervals in the surface half of the mounting plate 30 and a slide shaft 22 is inserted between the supporting portions 20 and 21. And the base end side of the front step board 1 of the step board a is slidably attached to and held on the slide shaft 22 in the left and right directions, and the brackets 24, 24 are attached to the slide shaft 22 and the slide shaft 22. 22 and a second slide shaft 23 arranged in parallel in the up-down direction between the support parts 21 and 25 so as to be slidable in the left-right direction, and is installed between the brackets 24 and 24. 26, a step board lifting cylinder 8 integrally provided with the step board a is slidably provided with one end 9. The brackets 24, 24 are provided side by side with the slide shaft 22. Use One end 28 of the binder 27 is fixed, and the walking plate slide cylinder 27 has the other end 29 fixed near the approximate center of the mounting plate 30. Can be moved in the left-right direction together with the step board lifting cylinder 8 via the brackets 24, 24.

Further, in the above-described aspect, one walk plate a has been described, but the other walk plate a is also configured in the same manner as in the above example, and is symmetrically arranged in the other half area of the surface of the mounting plate 30. Since each structure of the walk board a, the walk board lifting cylinder 8, the butterfly portion 3, the wire rope 16 and the like is the same as that of the embodiment shown in FIG. 1, the same parts are designated by the same reference numerals and the description thereof will be omitted. To do.

Therefore, in this aspect, first, the left and right step plate sliding cylinders 27, 27 are expanded and contracted, and the respective step plates a are attached via the brackets 24 integrated with the cylinders 27, 27. , A are slid in the right and left directions, and are adjusted to the intervals of step plates a 1 and a 2 according to the left and right crawler (endless track) intervals of a heavy load (not shown) such as a bulldozer.

Then, after adjusting the distance between the step plates, the step is moved up and down in the same manner as in the embodiment shown in FIG. That is, when the step plate lifting cylinder 8 is moved down and the piston rod 10 is contracted, the front step plate 1 rotates and descends with the base end side on which the front step plate 1 is attached as a fulcrum according to the contraction operation of the rod 10. At the same time, the descending operation causes the rear walking board 2 to be deployed by its own weight around the butterfly portion 3, whereby the wire rope 16 is pulled and the rear walking board 2 is moved about the butterfly portion 3 so as to move the end portions 1a and 2a. Forced rotation in the butt direction. Then, when the end portions 1a, 2a of the front walk plate 1 and the rear walk plate 2 are brought into abutment with each other, both the plates 1 and 2 are configured in a straight line, and the front ground contact surface 2d of the rear walk plate 2 is a road surface. Grounded.

When the step board a is lifted by the step board lifting cylinder 8, the front step board 1 is rotated and lifted with the base end side on which the front step board 1 is pivoted as a fulcrum according to the lifting operation. By the ascending operation, the rear walking board 2 is deployed by its own weight around the butterfly portion 3, and the tip thereof rises together with the front walking board 1 while being folded around the butterfly portion 3 so that the ground contact surface 2d side faces the front walking board 1 side. At the rear position of the vehicle deck b, both plates 1 and 2 are erected in a half-folded state with the butterfly part 3 at the center.

[0024]

[Effect of the invention]

 According to the present invention, a pair of left and right support plates are provided on the left and right sides of a mounting plate surface that is detachably formed at the rear end of the vehicle deck, and the left and right support plates are automatically undulated. Since a step board device is provided as a kit by arranging a step board structure that can be automatically slid, the above-mentioned mounting board can be easily mounted by fixing it to the rear end surface of the deck, and at the same time, the mounting board and the rear deck can be installed. If the step board device can be integrally removed from the vehicle by releasing the connection with the end face, the step board device can be easily repaired and replaced. In addition, since the wire rope that extends between the front and rear walking boards through the butterfly portion is stretched on the side of the walking board, there is no risk of heavy objects getting caught on the wire rope during the loading and unloading of heavy objects. A walking board device for a carrier can be provided. Therefore, the step board device itself can be easily repaired and replaced, and at the time of loading and unloading heavy machinery (vehicles) such as bulldozers and excavators, the heavy machinery is caught by the wire rope and the wire rope is mistakenly misplaced. The problems of the prior art, such as the heavy machine misdirecting due to being cut or caught, have been completely solved, and not only is it extremely easy to use, but it is also possible to improve safety. .

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a step board device for heavy goods vehicles of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a front view showing another embodiment of the step board device for heavy goods vehicles of the present invention.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

6 is a sectional view taken along line VI-VI of FIG.

7 is a sectional view taken along line VII-VII of FIG.

8 is a sectional view taken along line VIII-VIII of FIG.

[Explanation of symbols]

 A: Walking board device a: Walking board 1: Front walking board 2: Rear walking board 1a, 2a: End portion 1b, 2b: Side surface 3: Butterfly portion 8: Walking board lifting cylinder 16: Wire rope 30: Mounting plate

Claims (1)

[Utility model registration claims] 1. A left and right walk board which is divided into a front walk board and a rear walk board in the front-rear direction and has a butterfly portion at its end butting position so as to be folded and housed in a mountain fold shape, In the step board device, wherein the step board is located at the rear position of the vehicle deck and is rotatable back and forth, and is movable in a stretched shape and a mountain fold shape by a lifting cylinder, the left and right front step board base ends are Wire ropes that are attached to the left and right sides of the mounting plate that is detachably formed at the rear end of the deck and that are tensioned when the front and rear step plates are stretched are stretched along the side surfaces of the front and rear step plates via the butterfly portions. A step board device for heavy goods vehicles, characterized in that the step cylinder is mounted on the mounting board side and the front step board.