JPH0222332Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an improvement in the opening cover of a current collecting trolley pit in a mobile machine such as an overhead crane.

[Prior art]

The conventionally used trolley pit opening cover (hereinafter simply referred to as the cover) was developed in 1973.
As disclosed in Publication No. 11018, a wire rod such as a piano wire is buried in a belt-shaped body made of an elastic material such as rubber so as to be perpendicular to the longitudinal direction of the belt-shaped body for reinforcement. It has been done. More specifically, FIG. 1A is a cross-sectional view perpendicular to the longitudinal direction of the cover (cross-sectional view taken along A--A in FIG. 1B), and FIG. As shown in (B), the cover is composed of a belt-shaped main body a and a reinforcing wire b embedded in the upper surface side of the belt-shaped main body, and the belt-shaped main body a includes a belt-shaped flat plate part 2, a belt-shaped flat plate part 2, Side walls 1 hanging from both longitudinal ends of the
It consists of a protrusion 3 that protrudes from the lower surface of the band-shaped flat plate portion 2 and is fitted into a groove of a guide roller (not shown), and the side wall 1 has a cutout groove 4 that opens downward.
is provided. The reinforcing wires b are embedded across the entire width of the belt-like body at appropriate intervals so as to be orthogonal to the longitudinal direction of the belt-like body.

The conventional cover with the above structure has the advantage of being able to bend in parallel to the reinforcing wire and safely supporting a person even when riding on the reinforcing wire of the cover, but this cover has been used for a long time. Over time, the band-like main body portion covering the end portion 5 of the reinforcing wire becomes damaged, and the end portion 6 of the reinforcing wire becomes exposed. In this case, corrosion progresses from the edge portion 6, and the reinforcing wire covering power of the strip body is reduced due to damage to the strip body covering the edge portion, so the exposed portion of the reinforcing wire increases, and people The end portion of the reinforcing wire, which has residual bending stress due to being ridden many times, comes to protrude upward from the belt-like main body. The protruding end portion of the reinforcing wire gets caught on the rollers and roller cases of the moving machine as it passes by, which may cause the reinforcing wire to be pulled away from the belt-shaped body or the belt-shaped body to be twisted, causing the cover to close. There is a problem in that accidents such as the twisted portion getting into the opening of the pit occur.

[Purpose of invention]

The present invention aims to advantageously solve the problems of the above-mentioned conventional covers.

[Structure and action of the idea]

The gist of the present invention is to provide a trolley pit opening cover in which a reinforcing wire is embedded in a belt-shaped body made of an elastic material so as to be perpendicular to the longitudinal direction of the belt-shaped body. This trolley pit opening cover is characterized in that a holding member is embedded together with the reinforcing member, covering the reinforcing wire in a direction intersecting with the reinforcing wire and extending in the longitudinal direction.

Hereinafter, the structure of the cover of the present invention will be explained in detail with reference to the drawings.

FIG. 2 is a side sectional view of the cover of the present invention. Reference numerals a, b, 1, 2, 3, and 4 in FIG. 2 indicate the same elements or parts as those indicated by the same reference numerals in FIG. Reference numeral 10 in FIG. 2 is a holding member that presses down the reinforcing wire b. In FIG. Portions 12,1 extending from the covering portion 11 on both sides in the longitudinal direction of the band-shaped body
2'. And the presser member 10 is the third
As shown in the figure, the structure was such that the entire length of the reinforcing wire b was covered. In this example, the presser member was made of cotton cloth.

The cover having the presser member shown in Figs. 2 and 3 has a significantly longer usage period until the edge portion of the reinforcing wire is exposed, and after the exposure, the reinforcing wire does not protrude away from the belt-like main body. The period of maintenance and inspection of the cover is also significantly longer, and the cost of maintenance and inspection of the cover is reduced.
The risk of the cover becoming twisted has been greatly reduced.

Note that the holding member of the present invention is not limited to the structure of the holding member shown in FIGS. 2 and 3, but may have a structure provided only at both ends of the reinforcing wire b, as shown in FIG. 4A,
As shown in FIG. 4B, the holding members may be arranged at appropriate intervals, or as shown in FIG. 4C, the holding members may be straddled over a plurality of reinforcing members.

Moreover, the shape of the presser member covering the reinforcing wire material is the second,
As shown in Figure 3, it is preferable to have a shape that spans the reinforcing wire from its lower end to its upper end;
As shown in FIG. 5(b), the reinforcing wire may have a flat plate shape that touches the upper end of the reinforcing wire, and furthermore, as shown in FIG. 5(c), the portion extending in the longitudinal direction of the belt-like body may be in the shape of only one side of the reinforcing wire.

Further, although cotton cloth was used as the material for the holding member in the above example, appropriate materials such as hard plastic, a thin metal plate, a layered plate of metal and plastic, etc. may be used depending on the atmosphere of the location where the mobile machine is used.

[Effect of idea]

According to the present invention, the holding member that covers and extends the reinforcing wire in the direction intersecting with the reinforcing wire of the conventional trolley pit opening cover is buried together with the reinforcing wire. Even when a load is applied, the bending stress that remains in the reinforcing wire is lower than that of conventional ones, so the usage period until the edge of the reinforcing wire is exposed and the length of the end of the reinforcing wire after the exposure is shortened. Both the period until the reinforcing wire is exposed and the period until the exposed end portion of the reinforcing wire separates from the band-like main body and projects upward are both significantly longer than in conventional covers. Therefore, maintenance, inspection, repair, or replacement of the cover can be carried out in plenty of time, and it is possible to prevent detachment of the reinforcing wire and twisting of the cover, which conventionally occurred, and to avoid accidentally riding on the part where the reinforcing wire has detached. Moreover, it is possible to eliminate the occurrence of a situation where something on the cover falls into the trolley pit, which could cause an accident.

[Brief explanation of the drawing]

Figure 1A is a cross-sectional view perpendicular to the longitudinal direction of the conventional trolley pit opening cover, Figure 1B is a cross-sectional view of Figure 1A, and Figure 2 is the trolley pit opening cover of the present invention. FIG. 3 is a perspective view showing an example of the shape of the presser member, FIG. 4 A, B, and C are explanatory views of examples of the arrangement of the presser member, and FIG. is an explanatory diagram of an example of a shape that covers the reinforcing wire. a... Band-shaped main body, b... Reinforcement wire material, 10... Pressing member.

Claims (1)

[Scope of utility model registration request] In an opening cover of a trolley pit, in which a reinforcing wire is embedded in a belt-shaped body made of an elastic material so as to be perpendicular to the longitudinal direction of the belt-shaped body, the reinforcing member is inserted in a direction intersecting the reinforcing wire. 1. A cover for an opening of a trolley pit, characterized in that a presser member that covers and extends in the longitudinal direction is buried together with the reinforcing wire.