JPH0344753Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application This invention relates to a gangplank used for loading and unloading cargo such as agricultural machinery and passenger cars to and from freight cars, trucks, etc.

Prior art and its problems The gangplank includes a pair of left and right metal side frames extending in the front-rear direction, and a plurality of metal treads extending between the two side frames. It consists of a plurality of downwardly protruding reinforcing walls formed on the lower surface at intervals in the front-rear direction and extending in the left-right direction, and an inwardly protruding step plate receiver part extending in the length direction is formed on the opposing surface of each side frame, With both sides of the tread placed on the tread holders of both side frames, the edge of the top surface of the tread body and the surface facing the side frame are welded along the entire length, and the lower surface of the reinforcing wall and the tread holder are welded together. It is conventionally known that the protruding end surface of the part is welded.

However, in such a gangplank, the tread and side frame are welded together with both sides of the tread simply resting on the tread receivers on both side frames, so if the welding comes off, the gangplank must be disassembled. This poses a problem in that it is dangerous and requires a jig to temporarily fix the tread and both side frames during welding.
In addition, in order to firmly connect the tread and both side frames, the edge of the top of the tread must be welded to the side frames along its entire length, which results in high welding costs and time-consuming welding work. There's a problem.

The purpose of this invention is to provide a spanboard that solves the above problems.

Means for Solving the Problems The gangplank according to this invention has a pair of left and right metal side frames extending in the front-rear direction, and a plurality of metal treads extending between the side frames. A fitting groove is formed on both sides of the tread plate that opens inward and extends in the length direction, and a downward protrusion that extends in the length direction is formed on the opening edge of the inner surface of the upper side of this groove. The tread body has a plurality of ridge-like parts formed at intervals in the front-rear direction and whose height is equal to the protruding length of the lower projection, and a tread body having a plurality of ridge-like parts formed at intervals in the front-rear direction and extending in the left-right direction on the lower surface of the main body. It includes a plurality of downwardly protruding reinforcing walls and a horizontal wall formed at the lower end of the reinforcing wall and extending in the left-right direction, and downward protrusion engaging notches are formed at both ends of each ridged portion, and both sides of the tread The upper surface of the ridged part and the inner surface of both sides of the frame are fillet welded in a state in which the parts are fitted into the fitting grooves of both sides frames and the lower protrusions of both sides are respectively engaged with both notches of the ridged part. Additionally, the lower surface of the horizontal wall and the inner surface of both sides of the frame are fillet welded.

Embodiments Hereinafter, embodiments in which this invention is applied to a folding gangplank will be described in detail with reference to the drawings.

The folding type gangplank 1 consists of two front and rear spanboard structures 2 and 3 that are rotatably connected to each other at one end. Rear gangplank structure 3
is a pair of left and right side frames 4 made of extruded aluminum material.
and five tread plates 5, 6, 7 made of extruded aluminum material which are stopped between the side frames 4 and arranged at intervals in the front and rear direction. A cross-sectional stopper 8 is welded to the front and rear upper corners of each side frame 4. In addition, on the lower surface of the rear end of each side frame 4,
A cross-sectional hook member 9 is welded.
The upper rear end of each side frame 4 is notched in an inclined shape. An end cover 10 is provided at the rear end of each side frame 4.
is fixed. Furthermore, a carrying handle 11 is fixed to the length center portion of the outer surface of one side frame 4.

Each side frame 4 has a substantially U-shaped cross section with an outward opening, and is composed of a vertical portion 12 and a pair of upper and lower horizontal portions 13. At the center of the height of the vertical portion 12, a U-shaped outward projecting portion 14 whose cross section opens inward is formed over the entire length, and a tread side fitting groove 15 is formed by this projecting portion 14. has been done. A downward projection 1 extending in the length direction is formed on the opening edge of the inner surface of the upper side of this groove 15.
6 is formed.

The treads 5, 6, and 7 include a tread 5 provided at the front end of the gangplank structure 3, a tread 7 provided at the rear end, and three treads 6 provided between both the treads 5, 7. There are three types.

The three middle treadboards 6 include a treadboard main body 17 having a cross-sectional ridged part 17a extending in the left-right direction at the front end, front-rear center, and rear end, and a lower end of the front wall of the front ridged part 17a, and a center three reinforcing walls 18 extending downward from the lower end of the rear wall of the ridged part 17a and the lower end of the rear wall of the ridged part 17a on the rear side, and a horizontal wall 19 formed at the lower end of each reinforcing wall 18 and extending in the left-right direction. It is equipped with The ridged portion 17a is formed so that its height is equal to the protruding length of the lower protrusion 16.

Of the entire upper surface of the tread body 17, only the upper surface of the ridged portion 17a is welded to the inner surface of the both side frames 4, as will be described later.
The wall is thicker than other parts of the body. At both ends of each ridged portion 17a, a notch 2 for engaging a downward protrusion is provided.
0 is formed respectively.

This footboard 6 has both sides fitted into the fitting grooves 15 of both side frames 4, and the lower protrusions 16 of both side frames 4 are respectively engaged with both notches 20 of the ridged part 17a. The upper surface of 17a and the inner surface of both side frames 4 are fillet welded, and the horizontal wall 1
It is fixed to both side frames 4 by fillet welding the lower surface and the inner surfaces of both side frames 4.

The tread plate 7 located at the rear end of the gangplank structure 3 includes a tread body 17 having a cross-sectional ridge portion 17a extending in the left-right direction at the front and rear ends, and a lower end of the front wall of the front ridge portion 17a. and rear ridged part 17a
Two reinforcing walls 18 extend downward from the lower end of the rear wall, an inclined wall 21 extends diagonally downward rearward from the rear wall of the ridged portion 17a on the rear side, and the lower end of each reinforcing wall 18 and the lower end of the inclined wall 21 are formed. It also includes a horizontal wall 19 extending in the left and right direction. Ridged portion 17a
is formed so that its height is equal to the protruding length of the lower projection 16. The upper wall of the ridged portion 17a is formed thicker than the other portions of the tread body 17. A notch 20 for engaging a lower protrusion is formed at both ends of each ridged portion 17a.

This footboard 7 has both sides fitted into the fitting grooves 15 of both side frames 4, and the lower protrusions 16 of both side frames 4 are respectively engaged with both notches 20 of the ridged part 17a. The upper surface of 17a and the inner surface of both side frames 4 are fillet welded, and the horizontal wall 1
It is fixed to both side frames 4 by fillet welding the lower surface and the inner surfaces of both side frames 4.

The tread plate 5 at the front end of the gangplank structure 3 has a tread body 1 having a cross-sectional ridged portion 17a extending in the left-right direction from the front end to the front-rear center and rear end.
7, two reinforcing walls 18 extending downward from the lower end of the rear wall of the central ridged portion 17a and the lower end of the rear wall of the rear ridged portion 17a, and two reinforcing walls 18 formed at the lower end of each reinforcing wall 18 and extending in the left-right direction. It has an extending horizontal wall 19 and a hinge blade part 22 extending from the lower surface of the front end of the tread body 17 downward from the lower end of the side frame 4 and in the left-right direction. The ridged portion 17a is formed so that its height is equal to the protruding length of the lower protrusion 16. The upper wall of the ridged portion 17a is formed thicker than the other portions of the tread body 17. Each ridge 1
From both ends of 7a, there are cutouts 20 for engaging the lower protrusion.
are formed respectively.

The hinge blade part 22 has a vertical wall 23 and a vertical wall 23.
It consists of two core rod insertion legs 24 formed at the lower end at a distance in the left-right direction. A rearwardly projecting horizontal wall 19 is formed at a mid-height portion of the rear surface of the vertical wall 23 . Both leg portions 24 are formed at the lower end of the vertical wall 23 and extend in the left-right direction.
It is formed by cutting out a desired location (indicated by chain line A in the figure). The central axis of both legs 24 is
It passes forward and diagonally downward from the lower end of the vertical wall 23 at a required distance. At the front end of the tread body 17,
A lower protrusion 25 is formed. This lower ridge 2
5 and the front of the stopper 8 are both leg portions 24.
lies in the vertical plane passing through the central axis of

This footboard 5 has its both sides fitted into the fitting grooves 15 of the both side frames 4 until the rear surfaces of the vertical walls 23 of the hinge blades 22 come into contact with the front end surfaces of the both side frames 4, and the lower protrusions 16 of the both side frames 4. are engaged with both notches 20 of the ridged portion 17a, the horizontal wall 1 is located between the upper surface of the ridged portion 17a and the inner surface of both side frames 4
Between the lower surface and the inner surface of both side frames 4, and the hinge blade part 2
It is fixed to the both side frames 4 by fillet welding between the rear surface of the vertical wall 23 of No. 2 and the inner surface of both side frames 4, respectively.

Since the front gangplank structure 2 is almost longitudinally symmetrical with the rear gangplank structure 3, the same reference numerals are given to corresponding parts of the rear gangplank structure 3.
Descriptions of the same parts will be omitted. The front gangplank structure 2 differs from the rear structure 3 in that no hook member 9 is provided and in the number and arrangement of the legs 24 of the hinge blades 22 of the footboard 5 at the rear end. .

The hinge blade part 22 of the footboard 5 provided at the rear end of the front gangplank structure 2 is connected to the two legs 24 of the hinge blade part 22 of the footboard 5 of the rear gangplank structure 2.
It has three legs 24 arranged at outer and intermediate positions, respectively. These three legs 24
The cylindrical portion (indicated by chain line A in FIG. 5) formed at the lower end of the vertical wall 23 of the hinge blade portion 22 and extending in the left-right direction is formed by cutting off a required portion. Therefore, the front gangplank structure 2
and the tread 5 of the rear gangplank structure 3.
can be made from the same material.

Both gangplank structures 2 and 3 are connected to the legs 24 of both tread plates 5.
are assembled alternately, a core rod 26 is inserted through these leg portions 24, a washer 27 and a nut 28 are fitted to both ends of the core rod 26, and the nuts 28 are welded to the core rod 26. Bar 26
It is rotatably connected around the center. When both the connecting plate structures 2 and 3 are unfolded from the folded state, the stoppers 8 of both structures 2 and 3 come into contact with each other, so that the extended state can be maintained. In use, the hook 9 is hung, for example, on the bed of a truck.

Effects of the invention In the gangplank according to this invention, both sides of the tread are fitted into the fitting grooves of both side frames, and the lower protrusions of both sides of the frame are respectively engaged with both notches of the ridged part, so that the tread is fitted into the both side frames. On the other hand, it is less likely to shift laterally, and a jig for temporarily fixing the tread and both side frames is not required during welding. Since only the upper surface of the ridged portion of the entire upper surface of the tread body is welded to the inner surface of the side frame, fewer welding locations are required compared to conventional ones. In addition, since it is possible to reduce the thickness of the entire tread plate body other than the ridged portion to which welding is performed, it is possible to reduce costs.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; FIG. 1 is a perspective view of a folding gangplank, and FIG.
3 is an enlarged sectional view taken along the - line in FIG. 1, FIG. 4 is an enlarged sectional view taken along the - line in FIG. 1, and FIG. 5 is an enlarged sectional view taken along the - line in FIG. FIG. 1...Foldable gangplank, 2, 3...Gangboard structure, 4...Side frame, 5, 6, 7...Treadboard, 15...
...Tread insertion groove, 16...Downward protrusion, 17...Tread body, 17a...Ridged portion, 18...Reinforcement wall, 19
...Horizontal wall, 20...notch.

Claims (1)

[Scope of utility model registration request] In a gangplank equipped with a pair of left and right metal side frames extending in the front-rear direction and a plurality of metal treads extending between the side frames, each side frame has an inward opening and a longitudinally extending side frame. A fitting groove is formed on both sides of the elongated tread, and a downward protrusion extending in the length direction is formed on the opening edge of the inner surface of the upper side of this groove. a tread body having a plurality of ridge-shaped parts whose length is equal to the protrusion length of the downward protrusion; a plurality of downwardly protruding reinforcing walls formed on the lower surface of the main body at intervals in the front-rear direction and extending in the left-right direction; A notch for engaging a lower protrusion is formed at both ends of each ridged portion, and both sides of the tread are fitted into the fitting grooves of both side frames, respectively. When the lower projections of the frame are engaged with both notches of the ridged portion, the upper surface of the ridged portion and the inner surfaces of both sides of the frame are fillet welded, and the lower surface of the horizontal wall and the inner surfaces of both sides of the frame are fillet welded. A gangplank characterized by being welded.