JP2666129B2 - Mounting device for footrests for manholes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole having a foot portion and side portions located on both sides of the foot portion. The present invention relates to a device for mounting a footrest for equal use.

[0002]

2. Description of the Related Art Conventionally, a footrest for a manhole or the like having a stepping portion and side portions located on both sides thereof, wherein the stepping portion and the side portion are formed of a cored bar and a synthetic resin covering the cored bar. For example, as shown in Japanese Utility Model Publication No. 4-4040, a hook-shaped leg is extended from both sides, and the hook-shaped leg is formed on a wall such as a manhole. There is a device in which a footrest is fixed by inserting it into a hole for attaching a hook and fixing it with an adhesive.

As shown in FIG. 5, a leg extending linearly from both sides is inserted into a hole for mounting a footrest formed in a wall of a manhole or the like to fix the footrest. Some have been made. That is, a split 23 is formed at the tip of each of the legs 22, 22 extending linearly from both sides 21, 21 of the footrest 20 in the axial direction. Is arranged. Then, with the piece 24 being slightly inserted into the opening at the tip of the leg 22, the foot hook 20 is inserted into a mounting hole formed in a wall of, for example, a manhole having a diameter substantially equal to the outer diameter of the leg 22. The leg 22 is made to enter while hitting the foot 25 with a hammer. At this time, when the piece 24 comes into contact with the inner wall of the hole, thereafter the piece 24 sequentially enters the leg 22 and the tip portion is sequentially enlarged in the split portion 23 of the leg 22. The leg 22 abuts on the inner periphery of the hole, and the leg 22 of the footrest 20 is fixed to the wall of the manhole.

[0004]

By the way, in the case where the legs are hook-shaped, a manhole for inserting the legs is used.
Since the diameter of the mounting hole formed in the wall of the tool etc. becomes large, the work of digging the hole is not easy, it requires excessive labor, a large amount of adhesive is required, and only the fixing of the footrest with the adhesive is required. Due to the long-term use of the footrest, the fixing by the adhesive may be broken and the footwear may rattle.

[0005] In the case of using the linearly extending leg, a piece for expanding is arranged at the tip opening of the leg, and a piece 24 is slightly inserted into the tip opening of the leg 22. In this state, the leg 22 is hit with a hammer into a mounting hole formed in, for example, a wall of a manhole having a diameter substantially equal to the outer diameter of the leg 22 while hitting the foot 22 with a hammer. , The insertion of the piece 24 and the entry of the leg 22 are unstable, and the diameter expansion of the tip of the leg 22 may not be satisfactory. It is necessary to drill the diameter of the mounting hole formed in the wall of the manhole etc. slightly larger than the diameter of the leg because it is done only by expanding the diameter of the tip of the Is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a foothold for a mounting hole formed in a wall of a manhole or the like. The legs are easily and securely fitted, and the mounting holes are relatively easy to drill. The footrest is securely attached to the wall such as a manhole, and the footrest can withstand long-term use. It is an object of the present invention to provide such a safe foot-holding device for a manhole or the like.

[0007]

In order to achieve the above-mentioned object, the present invention provides an apparatus for mounting a foot-holding tool for a manhole or the like, in which a mandrel is extended from both sides to respectively mount the foot-holding foot. A locking member made of synthetic resin, which covers the metal core of the leg portion and is further extended, is integrally formed with the synthetic resin covering the side portion, and the surface of the locking member is formed from the leg side to the side portion side. A plurality of fins, and a locking member is formed with a split in the axial direction from the leg side to the side, and the tip of a piece inserted into the locking member is attached to the end of the cored bar. The locking member is expanded by the entry of the piece, and the outer circumference and the fin of the locking member are positively brought into contact with the inner circumference of the mounting hole.

[0008]

1 to 4 relate to an embodiment of the present invention. FIG. 1 is a plan view of a footrest provided with a mounting device according to the present invention, and FIG. 2 is a side part and a leg. Sectional view of the part,
FIG. 3 is an explanatory view of a main part in a state where a footrest provided with the mounting device according to the present invention is set in a mounting hole, and FIG. 4 is an explanatory view of a main part in a state where the footrest is completely mounted in the mounting hole. is there.

In the drawings, reference numeral 1 denotes the entire footwear. The footwear 1 is composed of a foot portion 2 and side portions 3 and 3 located on both sides thereof. The side portions 3 are formed by coating a synthetic resin 5 such as polypropylene on a core 4 made of iron having a substantially U-shape in plan view.

The metal core 4 is extended from both sides 3 and 3 to form a metal core 4 a of the mounting legs 6 and 6 of the footrest 1. The synthetic resin 5 covering the side part 3 is
It extends to the side and further extends from the metal core 4a to form a locking member 7 made of synthetic resin and is integrally formed with the synthetic resin 5. A plurality of (for example, three) fins 8 are provided on the surface of the locking member 7 from the leg portion 6 side to the side portion 3 side.
The ends of the fins 8 are slightly curved so as to expand outward. The locking member 7 has a split 9 formed in the axial direction from the front end portion toward the side portion 3.

Reference numeral 10 denotes a cylindrical piece which is inserted into the locking member 7. A guide 11 comprising a large number of grooves in the axial direction is formed on the outer periphery of the tip of the piece.
Is engaged with the opening of the cored bar 4a on the leg 6 side, and the piece 10
Is stably held on the mounting leg 6 of the footrest 1. The other end of the piece 10 is a wedge portion 12 formed in a conical shape which is sequentially enlarged.

In the mounting device for the footrest 1 having the above structure, when the footrest 1 is fixedly mounted on the wall 13 of the manhole, for example, it is mounted on the wall 13 of the manhole at predetermined intervals. A hole 14 is formed. The diameter of this hole is
The tip of the fin 8 formed at the end may be lightly and elastically contacted.

Then, the piece 10 is inserted into the locking member 7 at the tip of the foot 6 on the leg 6 side, and the guide 11 at the tip of the piece 10 is inserted into the opening of the core 4a on the leg 6 side. Engage, piece 10
3 is completely and stably held in the leg 6, the locking member 7 of the leg 6 accompanied by the piece 10 is inserted into the mounting hole 14 as shown in FIG. In this state, the end of the piece 10 abuts against the inner wall of the mounting hole 14, and the tips of the plurality of fins 8 lightly and elastically abut the inner circumference of the hole 14.

In this state, the side part 3 or the foot part 2 of the footrest 1
The leg 6 in the mounting hole 14 while hitting it with a hammer in the direction of the arrow.
In the order. Since the piece 10 is in contact with the inner wall of the mounting hole 14 as described above, by this operation, the wedge portion 12 of the piece 10 The locking member 7 is expanded from the distal end. Meanwhile, the guide 11 at the tip of the piece 10
Sequentially enter the cored bar 4a, the pieces 10 are always stably and reliably held by the legs 6, and the legs 6 can be reliably advanced into the mounting holes 14. Then, as shown in FIG. 4, the outer circumference of the locking member 7 strongly contacts the inner circumference of the mounting hole 14, and the tips of the plurality of fins 8 also become larger. The leg portion 6 is closely attached to the mounting hole 14, and the leg portion 6 of the footrest 1 is securely fixed to the wall of the manhole.

[0015]

According to the present invention, the metal core is extended from both sides to form legs for attaching footrests, and the synthetic metal locking member is further extended to cover the metal core of the leg. And integrally molded with the synthetic resin covering the side portion, and a plurality of fins are provided on the surface of the locking member from the leg side to the side portion,
Further, a split is formed in the locking member in the axial direction from the leg portion side to the side portion side, and a tip of a piece inserted into the locking member is engaged with the end of the core metal, and the engagement of the piece is performed by the entry of the piece. Since the diameter of the stop member is increased so that the outer periphery and the fin of the lock member are positively brought into contact with the inner periphery of the mounting hole, the footholding device has an outer periphery and a plurality of lock members of the leg portion. The fin is pressed against the inner periphery of the mounting hole formed in the wall of the manhole, etc., and fits securely.
The footrest is securely attached to the wall of the manhole, etc., the mounting operation is easy, and the footrest is a safe mounting device for the manhole, etc. that can withstand long-term use. . Since the fixing of the footrest is performed by the expansion of the locking member and the fins, the mounting hole can be easily formed without requiring a high degree of precision, as compared with the fixing by the expansion alone.

[Brief description of the drawings]

FIG. 1 is a plan view of a footrest provided with a mounting device according to the present invention.

FIG. 2 is a cross-sectional view of a side part and a leg part.

FIG. 3 is an explanatory view of a main part in a state where a footrest provided with a mounting device according to the present invention is set in a mounting hole.

FIG. 4 is an explanatory view of a main part in a state where a footrest is completely mounted in a mounting hole.

FIG. 5 is a plan view of a conventional footrest.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foot-holding tool 2 Foot part 3 Side part 4, 4a Core 5 Synthetic resin 6 Leg 7 Locking member 8 Fin 9 Split 10 Pieces

Claims (1)

(57) [Claims] 1. A foot-holding tool for a manhole or the like having a foot portion and side portions located on both sides thereof, wherein the foot portion and the side portion are formed of a cored bar and a synthetic resin covering the core bar. The metal cores are extended from both sides to form legs for mounting footrests, and the synthetic resin locking members that cover the metal cores of the legs and are further extended are integrated with the synthetic resin that covers the side portions. Forming, forming a plurality of fins on the surface of the locking member from the leg side to the side, and forming the split in the locking member in the axial direction from the leg side to the side. The tip of the piece inserted into the locking member is engaged with the end of the metal core, and the diameter of the locking member is increased by the entry of the piece, so that the outer circumference and the fin of the locking member are placed on the inner circumference of the mounting hole. An attachment device for a foot-holding tool for a manhole or the like characterized in that it is positively contacted.