JP3825031B2 - Manhole footrest - Google Patents

Description

  The present invention relates to a footrest for manholes and the like having a foot step portion, side portions located on both sides thereof, and a leg portion inserted into a concrete wall.

  Conventionally, it has a foot part, a side part located on both sides thereof, and a leg part inserted into a concrete wall, and the foot part, the side part, and a part of the leg part are combined with the core metal and covering it. A synthetic resin tip integrally formed with the synthetic resin and integrally molded with the synthetic resin at the boundary portion between the side portion and the leg portion and capable of coming into contact with the concrete wall surface through packing. A manhole, etc. foot that has a stepped portion formed in the portion, a core metal is extended from the tip portion, a spacer that constitutes a water-stopping packing is disposed in the extended portion, and the spacer is tightened with a nut There is a hook (see, for example, Patent Document 1).

Registered Utility Model No. 3080204

  By the way, in the said prior art, in order to make the wrinkles formed in the boundary part of a side part and a leg part contact a concrete wall surface, a packing is inserted in a leg part and arrange | positioned between a wrinkle and a concrete wall surface. However, since the contact surfaces of the flanges and packing are composed only of flat surfaces, the packing may turn during installation and use, and the curvature of the wall surface of the manhole ensures There was a concern that it would not come into contact with the concrete wall surface.

  The present invention has been made in view of such problems of the prior art. The object of the present invention is to prevent the packing from being rotated, the packing serves as the positioning of the heel, and the footrest is stabilized. It is intended to provide footrests for manholes and the like installed on the manhole wall.

  It is another object of the present invention to provide a footrest for a manhole or the like in which the heel is securely brought into contact with the concrete wall surface and the footrest is more stably installed on the manhole wall surface.

  In order to achieve the above object, a footrest for a manhole or the like according to the present invention has a foot step portion, side portions located on both sides thereof, and a leg portion inserted into a concrete wall. The part, the side part, and a part of the leg part are integrally molded with a core metal and a synthetic resin covering the core part, and the flange that can contact the concrete wall surface through packing at the boundary part between the side part and the leg part is provided. In a manhole or other footrest integrally molded with synthetic resin, the leg insertion hole is formed in the center of the packing and the cross-sectional shape is tapered, and the packing is formed in the vicinity of the outer periphery of the flange. A plurality of protrusions are formed on the facing surface, and a concave hole into which each protrusion formed on the flange is inserted is formed on the surface facing the flange of the packing.

  Further, as the packing, those having different taper angles are adopted so as to adapt to the curvature of the manhole wall surface.

  As described above, a leg insertion hole is formed in the center of the packing and the cross-sectional shape is tapered, and a plurality of protrusions are formed on the surface facing the packing in the vicinity of the outer periphery of the packing, A concave hole is formed on the opposite surface to insert the protrusions formed on the heel, preventing the packing from rotating, positioning the heel, and the footrest is stably installed on the manhole wall for long-term use. It becomes a footrest for manholes that can withstand.

  In addition, since the packing uses a taper with a different taper angle in order to adapt to the curvature of the manhole wall, the heel is reliably brought into contact with the concrete wall surface, and the footrest is more stably installed on the manhole wall surface. This is a footrest for manholes.

  1 to 4 relate to an embodiment of a footrest for manholes or the like according to the present invention, FIG. 1 is a plan view of the footrest for manholes or the like according to the present invention, FIG. FIG. 3 is a side view thereof, and FIG. 4 is an explanatory view of a main part of the side portion and the leg portion of the footrest.

  In the figure, reference numeral 1 denotes the whole of the footrest. The footrest 1 is composed of a foot portion 2, side portions 3, 3 located on both sides thereof, and leg portions 4, 4 attached to a concrete wall or the like. A synthetic resin 6 such as polypropylene is integrally formed on an iron core 5 having a substantially U-shape in plan view, and a rust-proof coating. It is made.

Further, anti-slip patterns 7, 7... Are formed on the upper surface of the foot part 2 over the entire area, so that the foot of the operator or the like can slide on any part of the foot part 2. It can be moved up and down safely.
Further, for example, red reflectors 8 and 8 that are easily noticeable are attached between the both ends of the foot part 2 and inside the side part 3 with the anti-slip pattern 7 interposed therebetween. The existence position is clarified to enable safer lifting and lowering of workers.

Further, a corrugated grip 9 is formed in the axial direction of the inner side surface of the foot pedal 2, and a grip 11 having a corrugated surface on the surface is also formed in the axial direction of the lower surface of the foot pedal 2. ing.
In this case, when the elevator moves up and down the footrest 1, it is usually considered that the elevator moves up and down by holding the footrest 1 on several steps of the footrest 1 on which both feet are placed with both hands. By forming a waveform in the axial direction of the inner side surface of the foot part 2, it becomes easier to grip, and further, by forming irregularities on the surface in the axial direction of the lower surface of the foot part 2, The unevenness serves as a reliable anti-slip of the fingertips to prevent both hands from slipping and the elevator can safely raise and lower the footrest 1.

  Further, at the boundary portions between the side portions 3 and 3 and the leg portions 4 and 4, the flanges 13 and 13 are provided with the synthetic resin so as to come into contact with a concrete wall surface (not shown) through a resin packing 12. 6, when attaching the footrest 1 to the concrete wall, the heel 13 is in contact with the concrete wall surface to support the footrest 1, and the length of the embedded portion in the concrete wall is It is decided. A plurality of protrusions 14 and 14 are formed on the surface facing the packing 12 in the vicinity of the outer periphery of the flange 13.

  The packing 12 has a hole 15 for insertion of the leg 4 at the center and a tapered cross section, and a recess into which the projections 14 formed on the flange 13 are inserted on the surface facing the flange 13. A hole 16 is formed, and the outer diameter of the packing 12 is larger than the outer diameter of the flange 13. The concave hole 16 is a bottomed concave hole or a through concave hole depending on the thickness of the packing 12.

  Then, a stepped portion 17 is formed at the distal end portion of the synthetic resin 6 covering a part of the leg portion 4, and the cored bar 5 is extended from the distal end portion, and a nut 18 is screwed to the distal end of the extended portion. The screw part 19 to be formed is formed. The nut 18 is configured such that a resin spacer 20 and a washer 21 constituting a water-stopping packing are inserted into the extending portion and arranged in the portion to be embedded in the concrete wall and tightened. The resin spacer 20 has a frustoconical outer shape, and a through hole 23 is formed at the center of the large diameter surface 22.

In the footrest 1 having the above-described configuration, first, the packing 12 is inserted from the leg portion 4 side, and each protrusion 14 formed on the flange 13 is inserted into the recessed hole 16 formed in the packing 12. Is fixed to the ridge 13. The legs 4 of the footrest 1 are brought into contact with the concrete wall surface through the packings 12 and 12 in the through holes formed in the concrete wall which is the inner wall of a manhole or the like. Then, the spacer 20 and the washer 21 are inserted into the extended portion of the leg portion 4 from the outer wall surface side of the manhole or the like, and the nut 18 is tightened. By tightening the nut 18, the spacer 20 is brought into contact with and pressed against the stepped portion 17, and the conical portion of the spacer 20 is pressure-bonded to the through-hole formed in the concrete wall and the packings 12, 12 are attached. The interposed cages 13 and 13 are firmly brought into contact with the concrete wall surface.
In this way, the footrest 1 is securely and securely attached to the through hole of the manhole wall, and the heel 13 is reliably brought into contact with the concrete wall surface, so that the footrest 1 is stably installed on the manhole wall surface.
Further, since the packing 12 is prevented from rotating even in the long-term use of the footrest 1, the wall contact surface of the packing 12 is always in contact with the concrete wall surface accurately without the footrest 1 being rattled. The footrest 1 can withstand use.

  5 (a), (b), (c), (d), and (e) are enlarged front views of packings having different taper angles so as to adapt to the curvature of the manhole wall surface. When the wall surface of the manhole is, for example, a straight wall or a curved wall, the packing 12 is adapted to the curvature of the manhole, and by selecting and using the packing 12, the flange 13 is securely brought into contact with the concrete wall surface. The tool 1 is more stably installed on the manhole wall surface.

  In the present embodiment, the leg portions 4 and 4 are illustrated as being firmly attached to the manhole wall by tightening the nut 18, but the present invention is not limited to the above-described embodiment, and is claimed. As long as the configuration described in the above range is not changed, for example, a footrest or the like in which a hole is formed in a manhole wall and a leg portion is fixed with an adhesive or the like is also possible.

1 is a plan view of a footrest for a manhole or the like according to an embodiment of the present invention. It is a front view of FIG. It is a side view of FIG. It is principal part explanatory drawing of the side part of a footrest, and a leg part. (A), (b), (c), (d), (e) It is an enlarged front view of packing with which a taper angle differs in order to adapt to the curvature of a manhole wall surface.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Footrest 2 Foot part 3 Side part 4 Leg part 5 Core metal 6 Synthetic resin 12 Packing 13 １４ 14 Protrusion 15 Leg part insertion hole 16 Concave hole 25 Taper angle

Claims (2)

It has a foot part, side parts located on both sides of the foot part, and leg parts inserted into the concrete wall, and the foot part, the side part, and a part of the leg part are made of a core metal and a synthetic resin covering it. In a footrest for a manhole or the like, which is integrally molded and integrally formed with the synthetic resin with a collar that can be brought into contact with a concrete wall surface through a packing at a boundary portion between the side portion and the leg portion, a central portion of the packing And forming a plurality of protrusions on the surface facing the packing in the vicinity of the periphery of the flange, and forming the protrusion on the surface facing the flange of the packing. A footrest for a manhole or the like, characterized in that a concave hole is formed into which each of the projections formed in is inserted. The footrest for manholes or the like according to claim 1, wherein the packing has a different taper angle so as to adapt to the curvature of the manhole wall.

Images