JPH0731712U - Manhole cover opening / closing tool - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a manhole cover opening / closing tool capable of reliably and safely inserting a roller rod under a manhole cover plate. According to the present invention, a key bar holder 2 provided with a key bar 1 to be inserted into a key hole of a cover plate 13, a key bar holder 2 on one side, and a support bar 7 having a grip 3 on the other side are attached. Base 4
It is composed of a key bar holding portion 2 of the base body 4 and a fulcrum portion 5 rotatably attached between the grip 3. The fulcrum portion 5 is provided with a gripping spring 11 for sandwiching and gripping the roller rod in a roller rod gripping portion 5g cut in a semicircular concave shape, and a roller rod pushing spring 12. When the grip 3 is pulled down, the lid plate 1 with the fulcrum portion 5 as the fulcrum
3 is lifted and the roller rod pushing spring 12 bends, and when the gripping force of the gripping spring 11 that grips the roller rod 14 is exceeded, the roller rod is ejected by the repulsive force and automatically falls below the lid plate 13. Plugged in.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tool for opening and closing a manhole cover plate having an opening on a road surface.

[0002]

[Prior art]

 Generally, on the road surface, there is an entrance and exit of a hole called a manhole that leads to an underground pipe such as water and sewer, and it is closed with an iron cover plate. Since this cover plate is made to withstand the weight of automobiles and other vehicles passing over it, we use a cover plate with a considerable thickness and weight.

When performing work in an underground pipeline, the lid plate must be lifted and removed to open the entrance / exit. When this opening and closing work is performed by an operator, a key bar is inserted into the key hole of the cover plate and lifted by using the lever principle, and a roller bar is inserted into the gap and moved laterally to open. This work required at least two workers.

Therefore, for example, an opening / closing tool that can be opened / closed by one operator has been proposed, as described in Japanese Utility Model Application Laid-Open No. 64-14799. This manhole cover opening / closing tool is configured such that a roller rod is held in advance, and when the cover plate is lifted, the roller rod is pushed out and inserted into a gap between the lifted cover plates. In other words, a substantially semicircular recess for holding the roller rod is provided at the fulcrum of the tool, and the roller rod is pushed out by the roller extrusion protrusion provided on the base when the handle is pushed down.

[0005]

[Problems to be solved by the device]

 However, the manhole cover opening / closing tool described above does not prevent the manhole cover plate from being pushed even if the roller rod is pushed out when the cover plate is lifted up when the manhole is installed, for example, when working on a sloped road surface. May not go under. In that case, in addition to the operator who is lifting the lid plate, an operator is required to insert the roller rod.

Therefore, if the roller rods are securely inserted, the inserting work is unnecessary work, and attention is paid particularly to ensuring the safety of the work. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a manhole cover opening / closing tool capable of securely and securely inserting a roller rod under a manhole cover plate.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention has a handle fixed to one end of a base formed by joining two rectangular plates bent in a substantially Z shape in plane symmetry, and the other end of the base. A key bar holding part having a key that is inserted into a key hole provided in a cover plate of a manhole is rotatably supported by a shaft and is rotatable about a rotary shaft that penetrates between the two plate bodies of the base body. A manhole cover plate opening / closing tool comprising a fulcrum part pivotally supported on the fulcrum, and a substantially semicircular recess provided in the fulcrum part, and a gripping means for gripping a roller in the semicircular recess with a predetermined force. When the stress that occurs when the handle comes into contact with and pushes down the grip exceeds the predetermined force, the pushing means that discharges the roller gripped by the gripping means with a predetermined elastic force under the cover plate of the manhole. Provide a manhole cover opening / closing tool.

[0008]

[Action]

 With the manhole cover opening / closing tool configured as described above, when the force for holding the roller rod exceeds the force for gripping the roller rod due to the bending force of the spring for pushing out the roller rod, the bending force (repulsive force of the spring) causes the roller rod to move. It is ejected vigorously, and the roller rod is firmly inserted under the cover plate of the manhole.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 are views showing the construction of a manhole cover opening / closing tool according to the present invention. FIG. 1 shows a characteristic part of the manhole cover opening / closing tool, and FIG. 2 shows an overall perspective view and a usage state.

This manhole cover opening / closing tool is roughly classified into a key bar holding portion provided with a T-shaped key bar 1 having a stopper function when the manhole cover plate is inserted into a key hole of the manhole cover plate and lifts the cover plate. 2, a base 4 having the key bar holder 2 attached to one side and a grip 3 on the other side, and a fulcrum 5 rotatably attached to the base 4.

The base body 4 has a U-shaped portion where the two side plates 4a and 4b are joined so as to face each other, and on the open side (between the two side plates) A of the U-shaped portion, The key bar holder 2 is attached by a rotary shaft 6 or the like so as to be rotatable. A support rod 7 provided with a grip 3 is attached to the side B of the U-shaped portion to be joined.

Further, the base body 4 has a protrusion C formed in the middle of the U-shaped portion (between the key rod holding portion 2 and the support rod 7), so that the fulcrum portion 5 can rotate. Etc.

The fulcrum portion 5 has two side plates 5a and 5b facing each other and joined at a joint portion 5c to form a Y-shape, and an end portion 5d attached to the protruding portion C, It comprises an end portion 5e provided with wheels 9 and an end portion 5f provided with a protrusion that functions as a stopper when the manhole cover opening / closing tool is used.

Between the end 5d and the end 5f of the fulcrum portion 5, a roller rod gripping portion 5g for cutting the roller rod in a semicircular concave shape and gripping the roller rod is provided. Further, an arc-shaped gripping spring 11 for sandwiching and gripping a roller rod (not shown) is attached, and an L-shaped roller rod pushing spring 12 for pushing out the roller rod to be gripped is attached to the opposite position. Has been installed. One end of each of these springs is fixed by a screw or the like.

With such a structure, it is configured so as to be bent into a substantially Z shape (support rod 7-base 4 and fulcrum 5 from end 5d to end 5e-end 5f), and the rotary shaft 8 is formed. By using the lever principle as a fulcrum, when the grip 3 is pulled down (arrow m), the keyboard holding portion 2 is pulled up (arrow n).

A method of using the manhole cover opening / closing tool configured as described above will be described in detail. First, a manhole cover opening / closing tool is installed on the edge portion of the cover plate 13 of the manhole, and the key rod 1 is inserted into the key hole of the cover plate 13 and set. In this state, the roller pushing spring 12 moves to the inside of the fulcrum portion 5.

Next, the roller rod is sandwiched and held by the roller rod gripping portion 5g. Then, by pulling down the grip 3 (arrow m), the key bar holding portion 2 is pulled up (arrow n), and the lid plate 13 is lifted. When the cover plate 13 is lifted, the roller rod pushing spring 12 hits the roller rod 14, the roller rod pushing spring 12 bends, and the bending force of the roller rod pushing spring 12 grips the roller rod 14. When the gripping force of the spring 11 is exceeded, the roller rod is vigorously ejected by the bending force (repulsive force), and is automatically inserted under the cover plate 13 of the manhole.

From the above, the manhole cover opening / closing tool of this embodiment pushes the gripping roller rod vigorously by the repulsive force of the pushing spring to reliably reach the bottom of the manhole lid plate. be able to.

In this embodiment, a spring is used as a member for gripping and discharging the roller rod, but the member is not limited to this, and has elastic force, for example, a spring, rubber, or other roller rod. Any member that can release with a force can be easily applied to this embodiment. Further, the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications and applications can be made without departing from the gist of the invention.

[0020]

[Effect of device]

 As described above, the manhole cover opening / closing tool of the present invention allows one operator to work when opening / closing the manhole cover plate, and can perform efficient work. Also, in terms of safety, since the roller rod can be inserted under the cover plate of the manhole without touching it by hand, safety is extremely improved. Therefore, according to the present invention, it is possible to provide a manhole cover opening / closing tool capable of reliably and securely inserting the roller rod under the manhole cover plate.

[Brief description of drawings]

FIG. 1 is a view showing a configuration of a characteristic portion of a manhole cover opening / closing tool according to the present invention.

FIG. 2 is an overall perspective view of the manhole cover opening / closing tool shown in FIG. 1 and a view showing a usage state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Key stick, 2 ... Key stick holding part, 3 ... Hand grip, 4 ... Base, 4
a, 4b, 5a, 5b ... side plate, 5 ... fulcrum part, 5c ... joining part, 5d, 5e, 5f ... end part, 5g ... roller rod gripping part,
6, 8 ... Rotating shaft, 7 ... Support rod, 9 ... Wheel, 11 ... Gripping spring, 12 ... Roller rod pushing spring, 13 ... Lid plate, 14 ...
Rolling stick.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Haruo Kakiuchi, 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Minoru Sogoshi 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo No. Japan Telegraph and Telephone Corporation

Claims (1)

[Scope of utility model registration request] 1. A handle is fixed to one end of a base body formed by joining two rectangular plate bodies bent in a substantially Z shape in plane symmetry, and the other end of the base body is provided on a cover plate of a manhole. Fulcrum rotatably rotatably supporting a key rod holding portion having a key to be inserted into the formed key hole, and rotatably rotatably rotatably supported by a rotary shaft penetrating between both plate bodies of the base body A manhole cover plate opening / closing tool comprising a portion and a substantially semicircular recess provided in the fulcrum portion, gripping means for gripping a roller in the semicircular recess with a predetermined force, and abutting against the roller. A push-out means for releasing the roller gripped by the gripping means with a predetermined elastic force under the cover plate of the manhole when the stress generated when the handle is pushed down exceeds the predetermined force. A tool for opening and closing manhole cover plates.