JPH09323579A - Automatic scaffold board for truck or trailer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with a wire and a pulley by utilizing a connecting bar to move a rear scaffold board according to the rotation of a front scaffold board by a link mechanism. SOLUTION: One end of a connecting rod 38 is rotatably fixed on the same axis as the rotating shaft of the supporting point 36 of a cylinder 20, and one- side ends of a front arm member 40 and a rear arm member 42 are concentrically fixed to the other end of the connecting rod 38 in such a manner as to be rotatable. Further, the other end of the front arm member 40 and the other end of the rear arm member 42 are rotatably fixed to a front scaffold board 30 and to a rear scaffold board, respectively. Since the connecting rod 38 is rotated together with the front scaffold board 30 while pushing up the rear scaffold board 34 to rotate it, when the cylinder 20 is contracted to rotate the front scaffold board 30 downward, the upper surface of the front scaffold board 30 and the upper surface of the rear scaffold board 34 are grounded in substantially the flushed state. In non-use, the cylinder 20 is extended to rotate the rear end of the front scaffold board 30 upward, and the front end and rear end of the rear scaffold board 34 is rotated up and down, respectively, and fixed together with the front scaffold board 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic walking board for carrying a heavy load on the bed of a truck or a trailer.

[0002]

2. Description of the Related Art In order to carry a heavy load on a truck or a trailer's load carrier, the rear end of the load carrier and the ground are connected by a walk board (hill), and the load board is used to carry the heavy load. It has been conventionally practiced to automatically fold this step board by using expansion and contraction of a hydraulic cylinder after it is placed on the luggage carrier to stand on the rear end of the luggage carrier.

[0003]

The conventional automatic walking board is
As shown in FIG. 2, a front walking board 14 having a front end pivotably attached to a rear end of a loading platform 10 of a truck or a trailer via a shaft 12, and a shaft at the rear end of the front walking board 14. The front walking board 14 is composed of a rear walking board 18 whose front end is rotatably pivoted via 16 and whose rear end can be grounded on the ground.
Rotatably attached to the action point 22 of the cylinder-20,
The front walk plate 14 is configured to rotate up and down by the expansion and contraction of the cylinder 20, and the wire 24 and the pulley 26 are used in accordance with the rotation of the front walk plate 14 to form the rear walk plate 1.
Since 8 was also configured to move, accidents such as breakage of the wire and disconnection of the pulley occurred.

An object of the present invention is to solve the above problem by using a connecting rod without using a wire and a pulley, and by arranging the link mechanism to move the rear walk plate in accordance with the rotation of the front walk plate. Is the solution.

[0005]

[Means for Solving the Problems] A front step board having a front end rotatably pivotally attached to a rear end of a bed of a truck or a trailer,
The front step board is rotatably attached to the rear end of the front step board, and the rear end of the front step board is groundable on the ground. The front walking plate is configured to pivot up and down by the expansion and contraction of the cylinder, while one end of the connecting rod is pivotally pivoted on the same axis as the rotation axis of the support point of the cylinder. Then, one end of the forearm member and one end of the rear arm member are pivotally attached to the other end of the connecting rod so as to be rotatable on the same axis, and the other end of the forearm member is used as a front step board and the other end of the rear arm member is moved backward. An automatic walking board for trucks and trailers, which is pivotally attached to the walking board.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway view of an automatic walking board of a truck or trailer according to the present invention during rotation, and FIG. FIG. 3 shows a state in which an automatic walking board according to the present invention is attached to the rear end of a trailer carrier, FIG. 3 shows an enlarged view of a portion A in FIG. 2, and FIG. 4 shows a conventional truck and trailer automatic. The state in which the step board is rotating is shown.

In FIGS. 1 and 2, a trailer carrier 10 is shown.
The automatic walking board of the present invention mounted on the rear end of the trailer includes a front walking board 30 whose front end is rotatably attached to the rear end of the trailer carrier 10 via a shaft 28, and the front walking board 30. The rear step plate 34 is rotatably attached to the rear end via a shaft 32, and the rear end can be grounded on the ground. The action point 22 of the cylinder 20 is pivotally attached, and the front walking plate 30 is configured to rotate up and down by the expansion and contraction of the cylinder 20. Stick 38
One end of the forearm member 40 and the rear arm member 42 are rotatably pivoted on the same axis to the other end of the connecting rod 38, and the other end of the forearm member 40 is forward. The other end of the rear arm member 42 is pivotally attached to the rear walk plate 34 on the walk plate 30.

With the above construction, as shown in FIG. 3, in order to connect the rear end of the rear walk plate 34 to the ground and connect the upper surface of the loading platform 10 and the ground with the walk plate (slope), the cylinder-20 is used.
When the front walking board 30 is rotated, the front walking board 30 pivots downward, and at the same time, the connecting rod 38 pushes the rear walking board 34 upward and pivots upward while simultaneously pivoting downward together with the front walking board 30. The upper surface of the plate 30 and the upper surface of the rear walk plate 34 are substantially flush with each other.

When not in use, when the cylinder 20 is extended, the rear end of the front walk plate 30 pivots upward, and at the same time the front end of the rear walk plate 34 pivots upward and the rear end pivots downward. And the front walking board 30 is fixed in a state shown by a two-dot chain line.

[0010]

As described above, according to the present invention, without using the wire and the pulley, the connecting rod is used to move the rear walk plate according to the rotation of the front walk plate by the link mechanism. It is stronger than before and has a convenient structure when used.

[Brief description of drawings]

FIG. 1 shows a partial cutaway view during rotation of an automatic walker plate of a truck, trailer according to the present invention.

FIG. 2 shows a state in which an automatic walking board according to the present invention is attached to the rear end of the trailer carrier.

FIG. 3 is an enlarged view of a portion A of FIG.

FIG. 4 shows a state in which an automatic walking board of a conventional truck or trailer is rotating.

[Explanation of symbols]

 10 trailer 12 axis 14 front step board 16 axis 18 rear step board 20 cylinder-22 action point 24 wire-26 pulley 28 axis 30 front step board 32 axis 34 rear step board 36 support point 38 connecting bar 40 forearm member 42 Rear arm member

Claims (1)

[Claims] 1. A front walking board having a front end rotatably pivotably attached to a rear end of a loading platform of a truck or a trailer, and a front end pivotably pivotably attached to a rear end of the front footing plate. It consists of a rear walk plate whose end can be grounded on the ground. The action point of the cylinder is pivotally attached to the front walk plate, and the front walk plate is turned up and down by the expansion and contraction of the cylinder. On the other hand, one end of the connecting rod is rotatably pivoted on the same axis as the rotation axis of the supporting point of the cylinder, and one end of the forearm member and the rear arm member is attached to the other end of the connecting rod. A track, tray characterized in that the other end of the forearm member is rotatably pivotally mounted on the same axis, and the other end of the forearm member is pivotally attached to the front walk plate and the rear walk plate. LA automatic walking board.