JPH10147217A - Sub-leg for trailer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend an expansion stroke as long as a sleeper is not required when a sub-leg is separated from a tractor during stop, in spite that an inner cylinder is small in size when stored. SOLUTION: This sub-leg, when separated from a tractor, supports a platform at the front side. It has an outer cylinder fixed downward from the front side of the platform, the first shaft 36 with the first screw portion engraved on the outer face, an upper inner cylinder 40 threaded to the first screw portion to be expansively moved up and down with the rotation of the first shaft, the second shaft 44 extended to the inside of the upper inner cylinder 40 and a hollow portion 46 formed in the second shaft. A rotation stopper is provided in the hollow portion for the first and second shafts 36, 44 to be rotated at the same time. A lower inner cylinder 54 is threaded to the second screw portion engraved on the outer face of the second shaft 44 to be expansively moved up and down with the rotation of the first and second shafts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary leg of a trailer, and more particularly to a trailer provided with a rear wheel at a rear portion thereof. The present invention relates to an auxiliary leg of a trailer for supporting a part.

[0002]

2. Description of the Related Art As shown in FIG. 4, a normal trailer 10 travels while being towed by a tractor 12, and an auxiliary leg 14 thereof is provided on a bed of a trailer as shown in FIGS. 3 (A) and 3 (B). An outer cylindrical portion 16 extending downward from the front portion, an inner cylindrical portion 18 housed inside the outer cylindrical portion 16 and movable up and down, and a grounding portion 20 is rotatable at the lower end of the inner cylindrical portion 18. When the vehicle is stopped and separated from the tractor 12, the inner cylindrical portion 18 is extended downward to
The bottom surface of the trailer 10 was grounded on the ground to support the bed of the trailer 10.

[0003]

In the conventional auxiliary leg 14 shown in FIGS. 3 (A) and 3 (B), the expansion / contraction stroke S depends on the dimension L of the inner cylinder portion when it is stored. However, on the other hand, the ground height H of the lower surface of the grounding portion at the time of storage is preferably as large as possible in consideration of unevenness of the ground during running, obstacles, etc., that is, it is desirable to be away from the ground, as described above. If L is small, the expansion / contraction stroke S also becomes small and does not serve as an auxiliary leg, and FIG.
As shown in the figure, a sleeper 22 is provided between the lower surface of the grounding portion 20 and the ground.
Had to be interposed.

[0004] An object of the present invention is to reduce the telescopic stroke S to the extent that the crossties are not necessary when the vehicle is stopped and separated from the tractor, even when the inner cylinder portion of the auxiliary leg is small in storage. The purpose of the present invention is to provide a trailer auxiliary leg that extends sufficiently.

[0005]

In order to achieve the above object, a trailer is towed by a tractor and runs on a rear wheel at a rear portion of a carrier, and supports a front portion of the carrier when stopped and separated from the tractor. The auxiliary leg includes a first cylindrical portion fixed downward from a front portion of the loading platform and a first screw portion engraved on an outer surface of the first cylindrical portion, the first cylindrical portion being rotatably extended downward inside the outer cylindrical portion. , An upper inner cylinder portion that is screwed into the first screw portion and expands and contracts vertically by rotation of the first shaft, and is rotatably extended inside the upper inner cylinder portion. A second shaft, and a hollow portion for accommodating the first shaft at the center of rotation of the second shaft so that the first shaft can be freely inserted into and removed from the second shaft. The second shaft is configured to rotate simultaneously, A trailing inner cylinder part which is screwed into a second screw part engraved on the outer surface of the shaft and is vertically extended and contracted by rotation of the first and second shafts. Providing legs.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a sectional view taken along the line A--A of FIG. 1B, showing an internal sectional view of an auxiliary leg of a trailer according to the present invention. 1
FIG. 2B is a partially cutaway side view of the auxiliary leg of the trailer according to the present invention, and FIG. 2A is an exploded perspective view of the lower end of the first shaft and the upper end of the second shaft. 2 (B) shows another embodiment of FIG. 2 (A), and FIG.
FIG. 3A shows still another embodiment of FIG. 2A, and FIG. 3A shows a state in which an inner cylinder of a conventional auxiliary leg is housed, and FIG.
FIG. 3 shows a state in which the inner cylinder of the conventional auxiliary leg is extended, and FIG.
FIG. 3C shows a state in which both the upper inner cylinder and the lower inner cylinder of the auxiliary leg of the trailer according to the present invention are accommodated inside the outer cylinder portion, and FIG. 3D shows the upper inner cylinder and the lower inner cylinder shown in FIG. FIG. 3 (E) shows a state in which the upper and lower inner cylinders of the auxiliary leg of the trailer according to the present invention are fully extended, and FIG. 4 shows a trailer loaded with containers. Shows a state in which the tractor is towing and traveling.

As shown in FIGS. 1A, 1B and 2A, an auxiliary leg 24 of the trailer shown in this embodiment has an outer cylindrical portion 26 fixed downward from the front of the loading platform, The bevel gear mechanism 3 is provided inside the outer cylindrical portion 26 by operating an external handle 28.
0, and extends downward so as to be rotatable (a detailed structure is omitted because it is a well-known structure), and the first screw portion 32 and the spline grooves 34, 34. . A first shaft 36 engraved with an upper inner cylinder 40 having an upper lid 38 that is screwed into the first screw portion 32 so as to expand and contract vertically by the rotation of the first shaft 36. I have.

A second shaft 44 is rotatably extended inside the upper inner cylinder 40 via a bearing 42, and the first shaft 36 can be freely moved in and out of the center of rotation of the second shaft 44. A hollow portion 46 for accommodating the spline grooves 34 and 3 is formed in the hollow portion 46 as a rotation stop portion.
4. . , The spline ridges 48, 48. . Is provided so that the first shaft 36 and the second shaft 44 rotate simultaneously, and the second shaft 4
4 is provided with an upper lid 52 that is screwed into a second screw portion 50 engraved on the outer surface of the outer cylinder 4 to thereby have a lower inner cylinder portion 54 that expands and contracts up and down by rotation of the first and second shafts 36 and 44. At the lower end of the lower inner cylindrical portion 54, the same grounding portion 20 as the conventional one is provided.

An important structure for achieving the object of the present invention, that is, a structure in which the first shaft 36 accommodates the second shaft 44 so as to be able to move in and out and rotates simultaneously, other than the spline mechanism of the above embodiment. As shown in FIG. 2B, fixing plates 56 are provided inside the second shaft 44 ', and fixing pieces 5 inserted between the fixing plates 56 are provided.
8 may be fixed to the lower end of the first shaft 36, and as shown in FIG. 2 (C), a flat surface is formed on the inner upper portion of the second shaft 44 ", and a flat portion corresponding to this flat surface is formed. 60
May be formed on the first shaft 36 ", and various other design changes are possible without departing from the spirit of the present invention.

[0010]

The present invention has the following features.
The telescopic inner cylinder is divided into an upper inner cylinder and a lower inner cylinder so that they can be expanded and contracted separately. It is an auxiliary leg of the trailer in which the telescopic stroke S extends sufficiently to the extent that the aforementioned sleepers are not necessary.

[Brief description of the drawings]

1 (A) is an internal sectional view of an auxiliary leg of a trailer according to the present invention, which is a sectional view taken along line AA of FIG. 1 (B), and FIG. The figure is shown.

FIG. 2A is an exploded perspective view in which a lower end of a first shaft and an upper end of a second shaft are cut, FIG. 2B shows another embodiment of FIG. 2A, and FIG. Shows still another embodiment of (A).

3A shows a state in which the inner cylinder of the conventional auxiliary leg is stored, FIG. 3B shows a state in which the inner cylinder of the conventional auxiliary leg is extended, and FIG. 3C shows an auxiliary state of the trailer according to the present invention. (D) shows a state in which the upper inner cylinder and the lower inner cylinder of (C) are being extended, and (E) shows a state in which both the upper inner cylinder and the lower inner cylinder of the leg are accommodated inside the outer cylinder part. () Shows a state in which the upper inner cylinder and the lower inner cylinder of the auxiliary leg of the trailer according to the present invention are completely extended.

FIG. 4 shows a state where a container is placed on a bed of a low-floor type trailer and is towed by a tractor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Trailer 12 Tractor 14 Auxiliary leg 16 Outer cylinder part 18 Inner cylinder part 20 Grounding part 22 Sleeper 24 Auxiliary leg 26 Outer cylinder part 28 Handle 30 Bevel gear mechanism 32 First screw part 34 Spline groove 36 First shaft 38 Top lid 40 Upper inner cylinder 42 Bearing 44 Second shaft 46 Hollow part 48 Spline ridge 50 Second screw part 52 Top lid 54 Lower inner cylinder part 56 Fixing plate 58 Fixing piece 60 Flat part

Claims (1)

[Claims] 1. A trailer which is towed by a tractor and runs on a rear wheel at a rear portion of a bed, wherein the auxiliary leg supports a front portion of the bed when the vehicle is stopped and separated from the tractor. A first shaft having a first screw portion engraved on the outer surface thereof, the first shaft portion being rotatably extended downward inside the outer cylinder portion, and a first screw portion being screwed into the first screw portion. In combination, an upper inner cylinder portion that expands and contracts up and down by rotation of the first shaft, a second shaft rotatably extended inside the upper inner cylinder portion, and a second shaft A hollow portion for accommodating the first shaft in a freely rotatable manner is formed at a rotation center portion, and the first shaft and the second shaft are configured to rotate simultaneously by providing a rotation stop portion in the hollow portion; A second screw engraved on the outer surface of the second shaft An auxiliary leg of a trailer, comprising: a lower inner cylinder portion that is screwed into a portion and that expands and contracts up and down by rotation of the first and second shafts.