JP3070368U - Opening / closing device for manhole covers - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a manhole cover opening / closing device that has a tool that does not fall down even if the user releases his hand during the cover opening work, and that can perform safe work. An engaging projection provided in the small opening so that a hook inserted into the small opening can be engaged, and a rear portion of the hook inserted into the small opening. The contact projection 15 in the small opening that can be contacted and the surface of the lids 11 on both sides of the small opening while the hook 21 is inserted into the small opening 12 are necessary to make the tool 20 stand alone. A manhole cover opening / closing device comprising left and right support portions 24 and 25 near a tool tip having a size and shape.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a device for opening and closing a manhole cover by inserting a hook at a tool tip into a small opening formed on the surface of the manhole cover.

[0002]

[Prior art]

 The tools used to open and close the manhole cover are commonly referred to as hand hooks or crowbars. Various types of tools are available from various companies, but they generally have a bar shape. For example, the one devised in Japanese Utility Model Publication No. 57-50375 is intended to improve the operability by adding a cross-like mood to a rod, and is used to pry the lid open at the tip and lift it up onto the receiving frame. .

However, there is a problem that the conventional tool falls down as soon as the hand is released from the tool, which hinders safe operation. In addition, there was also a disadvantage that the tool was easily dislodged from the lid because the movement of the lid and the tool was not fixed when pulling up the lid after prying it open.

[0004]

[Problems to be solved by the invention]

 The present invention has been made by focusing on the above points, and the problem is to provide a manhole cover opening / closing device that has a tool that does not fall down even if the user releases his hand during the cover opening work and that can perform safe work. To provide.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides an engaging projection provided in a small opening so that a hook inserted into the small opening can be engaged, and a rear part of a hook inserted into the small opening. The contact protrusion in the small opening that can make contact with the lid and the surface of the lids on both sides of the small opening with the hook inserted into the small opening, the size necessary to make the tool self-supporting, In this method, a manhole cover opening / closing device is constituted by the left and right supports near the tool tip having a shape.

[0006]

[Embodiment of the invention]

 The device according to the present invention is for opening or closing the lid by inserting a hook at the tip of a tool into a small opening provided on the surface of the manhole cover. The small opening shall be a so-called keyhole, a notch-shaped part into which a tool for unlocking the lid locking mechanism is inserted, or another blind hole.

[0007] The small opening is provided with an engagement projection therein so as to enable engagement of the inserted hook portion. The shape and structure of the engaging projection can be determined by the relationship with the shape and structure of the hook because the hook can engage with the hook. The protruding portion is also necessary for the engagement of the hook portion, and therefore does not need to be particularly protruded as long as it can be engaged. Also, the hook portion of the tool has dimensions suitable for inserting into the small opening and working.

[0008] The rear portion of the hook portion of the tool inserted into the small opening can be brought into contact with a contact projection in the small opening. Thus, the tool is fixed at the front and rear two places of the hook part and the engagement protrusion, and the rear part and the contact protrusion, so that the tool does not fall at least in the front-back direction. Due to the contact with the contact projection, the rear part on the tool side can also be made to protrude rearward.

The left and right support portions for supporting the lids horizontally by contacting the surfaces of the lids on both sides of the small opening and for allowing the tool inserted into the small opening to stand alone are near the tool tip. It can be set up. The left and right supporting parts support the tool on both sides to make it self-supporting, so that the tool that is already fixed in the front-rear direction is also fixed in the left-right direction to complete self-supporting (stable). Therefore, the supporting portion has a size and a shape necessary for self-stability.

In the present invention, the tool may have a rod shape. Handles and twisting parts are provided at appropriate locations.

[0011]

【Example】

 Hereinafter, the present invention will be described in more detail with reference to the illustrated embodiments. FIG. 1 shows the entirety of the lid 11 and the tool 20 provided on the receiving frame 10. The lid 11 is illustrated as a circular one, and a small opening 12 is provided at an edge of its surface. The illustrated small opening 12 has a bag-hole-shaped space 19 (FIGS. 2 and 5), and is located on the side opposite to the hinge mechanism 13 that fixes the lid 11 to the receiving frame 10. I have.

The tool 20 has a rod shape, and has a hook-shaped hook portion 21 at its tip. The hook portion 21 can further engage with the engaging protrusion 14 provided on the inner lower edge of the small opening 12 at the front end portion 22, and contact with the contact protrusion 15 in the small opening at the rear portion 23. It is possible. That is, when the hook portion tip portion 22 is engaged with the engagement protrusion 14, the rear portion 23 comes into contact with the contact protrusion 15, and when an action force is applied, a force necessary to pull out the lid 11 is applied. Will be able to

A pair of left and right support parts 24 and 25 are provided near the tip of the tool in order to horizontally support the lid 11 with a long tool 20 and make the lid 11 self-standing. The support portions 24 and 25 are for preventing the tool 20 from falling to the left and right by contacting the surface of the lid 11, and play a role of applying an acting force when the lid 11 is pulled out. The support portions 24 and 25 have contact portions 24a and 25a on the lower side that are in close contact with the lid 11 in order to support the lid 11 horizontally and prevent the lid 11 from falling down.

Further, the illustrated tool 20 has a prying portion 26 at the other end of the rod-shaped main body, and has a handle portion 27 intersecting with the rod-shaped main body. The handle portion 27 has stopper portions 28 on both sides.

When the manhole opening is opened by removing the lid 11 in the device of the present invention, the hook 21 at the tip of the tool is inserted into the small opening 12 (FIG. 6) and engaged with the engaging projection 14 (FIG. 6). 7 to 8), when the rear portion 23 is brought into contact with the contact protrusion 15, the left and right support portions 24 and 25 come into close contact with the lower side contact portions 24a and 25a. At this time, since the tool 20 is fixed in the front-rear direction by the engagement protrusions 14 and the contact protrusions 15 and is fixed in the left-right direction by the left and right support portions 24 and 25, the tool 20 stands stably and falls down even if the hand is released. Never. When a force is applied to the tool 20 to drag the lid 11 up, the tool 20 and the lid 11 are fixedly supported at the above-mentioned three points and four points, so that the tool 20 does not shift and work safely. You can proceed.

[0016]

[Effect of the invention]

 Since the present invention is configured and operates as described above, the tool can be accurately fixed to the lids when the lids are opened and closed, and there is no danger of the tools falling down even if the hand is released from the tools. In addition, since the lids supported by the tool are held horizontally, it is easy to maintain the parallel state, and thus there is an effect that safety can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a manhole cover opening and closing device according to the present invention.

FIG. 2 is a sectional view of a central portion passing through a small opening in FIG. 1;

FIG. 3A is a side view of a tool tip. (B) Front view of the tool tip.

FIG. 4 is an enlarged plan view around a small opening.

FIG. 5 is an explanatory sectional view showing a tool and a small opening.

FIG. 6 is an explanatory view of a state where a hook is inserted into a small opening.

FIG. 7 is an explanatory diagram showing a state immediately before a hook tip engages with an engagement protrusion;

FIG. 8 is an explanatory view showing a self-supporting state supported by three points and four points of a hook tip, a rear part, and left and right support parts.

Claims (2)

[Utility model registration claims] An apparatus for opening and closing a manhole cover by inserting a hook at a tool tip into a small opening formed on the surface of the manhole cover, wherein the hook is inserted into the small opening. An engagement projection provided in the small opening so as to enable engagement, a contact projection in the small opening capable of contacting a rear portion of the hook inserted into the small opening, and a hook in the small opening. The manhole cover is composed of left and right support parts near the tool tip that have the size and shape necessary to make the tool self-support by contacting the surface of the lid on both sides of the small opening in the inserted state. Switchgear. 2. The tool has a rod-shaped main body, has a hook portion directed forward at the tip of the rod-shaped main body, and has support portions protruding on both left and right sides of the rod-shaped main body above the hook portion. ,
2. The manhole cover opening / closing device according to claim 1, wherein the rod-shaped main body is defined so as to be orthogonal to the lid while being in close contact with the lid surface at the lower side of the support portion.