JP2000186334A - Apparatus for attaching detaching locking members and plugs for manhole cover or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arbitrarily change installation of locking members and plugs, and allow the locking members to be unlocked only by using a special tool, thereby rendering more difficult fraudulent opening of a manhole cover. SOLUTION: This apparatus for attaching/detaching locking members and plugs, has a plurality of female screw portions 12 formed in a cover body 11, and upper male screw portions 21 to be screwed into the female screw portions 12 from below. The apparatus is comprises of the locking members 20, the plugs 27, and a cover opening tool 30. The locking members 20 are engaged with portions on the side of a cover receiving frame 10 by rotation thereof, to thereby lock the cover body. The plugs 27 each have a lower male screw portion 28 screwed into the female screw portion 12 from above to clog the same. The cover opening tool 30 has engaging portions 31, 32 which can be engaged with engagement counterparts 33, 34, of the locking member 20 and the plug 27, respectively, and functions as a handle which can be screwed into the female screw portion 12. Therefore, only one engaging portion of the cover opening tool 30 is not applicable to the engaging counterparts of the locking member 20 and the plug 27 with respect to its shape and structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for attaching and detaching a lock member and an embolus in a manhole cover for fixing a lid which can open and close an opening of a lid receiving frame to the lid receiving frame.

[0002]

2. Description of the Related Art In a manhole device, a lid is fixed to a lid receiving frame mainly for the purpose of crime prevention, odor prevention or floating prevention. Conventional fixing methods for this purpose include a method of bolting the lid to the lid receiving frame and a method of using a lock device that is locked by closing the lid.

[0003] However, bolting the lid one by one has a problem in that it takes much time for the operation, and it takes time to open and close the lid. Also, because it is bolted, it can be easily removed by ubiquitous tools. In addition, if there is an unused bolt hole, it is necessary to check the location of the unused bolt holes in advance and close them.

On the other hand, a lock device requires a dedicated lid and a lid receiving frame to which the lock device is attached. On the other hand, it is not so difficult to find out how to unlock. However, if a plurality of lock devices are attached to one manhole device in order to enhance the effect, the cost cannot be ignored, and therefore, the conventional method has advantages and disadvantages.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and its object is to freely change the mounting of a lock member and an embolus. Unable to release, making unauthorized opening more difficult.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a manhole cover, in which a plurality of screw portions are provided on a cover portion located inside the opening edge in a state where the opening is closed, A locking member having an upper male screw portion screwed into the female screw portion from below, and being in a locked state capable of engaging with the lid receiving frame side by rotation around the screw, and a lower male screw screwing into the female screw portion from above And an embolus that closes the female thread, and a handle for opening the lid that is also screwed into the female thread, and an engagement partner provided on the lock member and the plug when the lock member and the plug are removed. A lock opening tool having an engaging portion engageable, the shape and structure of the engagement partner of the lock member and the plug are not the same, and the lock member and the plug have a shape and structure that cannot be shared by one type of engagement portion. It constitutes a detachable device

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The locking and removing device for a plug and a plug in a manhole cover according to the present invention relates to a technique for locking a cover for opening and closing a cover receiving frame to the cover receiving frame. Manholes include those used for communication network, electricity transmission and distribution, water supply and sewerage, and the like.

[0008] The internal thread portion provided at a plurality of positions on the lid portion may have a structure in which an internal thread is directly cut into the lid portion, or only an attaching portion is formed on the lid portion and the female portion is formed therein. A structure in which a female screw portion is provided by fitting another member having a screw may be employed. In the latter case, a vertically penetrating mounting hole can be formed in the lid as the mounting portion.

In any case, the lock member disposed in the opening of the lid receiving frame is screwed into the female screw portion from below the lid. On the other hand, since the purpose is to close the female threaded portion of the embolus, that is, the opening where the female threaded portion is cut directly or the mounting hole for fitting another mounting member, from the outside (upper side or surface) of the lid body Screwed.

There are a plurality of locations where female threads are provided or locations where mounting holes for fitting mounting members having female threads are provided, and it is possible to freely determine to which of these the locking member is attached and the embolus is attached. it can. For example, in the manhole device shown in FIG. 3, one manhole cover has two mounting holes, so that a lock member having a multiple of two can be mounted as a whole. However, where the locking member is attached can be changed for each lid, and each manhole device can have the locking member at a different position, which is more effective in preventing unauthorized opening.

The locking member may be attached along the edge of the lid and can be locked to the lid receiving frame. A structure that rotates about the mounting portion as a central axis, engages below the inwardly protruding portion of the lid receiving frame, and prevents the lid from moving upward is suitable as a lock member. However, the mode of operation of the locking member does not require that the mounting part be the central axis.

When the lock member is removed, the lock member is operated by a lid opening tool having an engagement portion provided on the lock member and capable of engaging with an engagement partner. The embolus is operated in exactly the same way with the lid opening tool. However, it is assumed that the shape and structure of the engaging member and the engaging portion of the lock member are different from the shape and structure of the engaging member and the engaging portion of the embolus. By doing so, the lock member and the embolus can be prevented from being illegally operated by one type of tool.

The shape of the mating partner can be freely determined. In the present invention, particularly, as a mating member of the lock member, a shape indicating the direction of the lock portion is adopted, so that it can be determined at a glance whether or not the lock state is established.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings.

A plurality of vertically penetrating female threads 12 are provided in a portion of the lid 11 near the outer edge located inside (center side) of the opening edge with the opening closed. This female thread 12
Is a means for attaching a lock member 20 to be described later and a means for attaching a cover opening tool 30 for opening the cover 11. If no further locking device is required, it is closed by an embolus 27.

The female thread 12 can be formed directly on the lid 11. However, if necessary, such as when the lid 11 is cast from cast iron or the like, a mounting member 13 having a female thread 12 is used.
Only 4 can be formed. Exemplary mounting hole 14
Is vertically penetrating. Such a mounting member 13 may have the female screw portion 12 having a length necessary and sufficient for mounting the lock member 20 and mounting the lid opening tool.

In the drawing, reference numeral 15 denotes a bolt as means for attaching the attaching member 13 to the lid 11 together with the lock member protecting body 25. The attachment member 13 may be welded to the lid 11 in some cases. A portion 16 around the mounting hole 14 to form a female screw hole for bolting
It can be formed slightly thicker. Reference numeral 17 denotes a packing sandwiched between the mounting member 13 and the back surface of the lid.

The lock member 20 described above has a female thread 12
Has a top threaded portion 21 for screwing from below, and is brought into a locked state in which it can be engaged with the opening edge 18 of the lid receiving frame 10 by rotation around the thread. For this reason, the lock member 20 has a lock portion 23 protruding from the vertical rotation shaft portion 22 having the upper male screw portion 21 toward the opening edge. See FIG.

When the locking member 20 is screwed in, the locking member 20 stops at the limit of the screwing of the self-aligning screw portion 12 and the upper male screw portion 21, but at this time, the position of the locking portion 23 does not always come below the opening edge 18. Absent. Then, the lock portion 23 is
A resistance member 24 for applying resistance can be interposed between the lid side (fixed side) and the lock member side (rotation side) so that the lock member 20 stops in the lock state that comes under the lock member 8.
In the illustrated example, a spring washer is used for the resistance member 24 to change elasticity into resistance. The exemplary resistance member 24 is disposed between the lower end of the mounting member 13 and the shoulder of the lock member rotation shaft 22.

The lock member protector 25 for protecting the lock member 20 bears the weight of the cover 11 when the cover 11 is removed, or protects the lock member 20 from impact. The illustrated lock member protector 25 has an inverted L-shaped structure attached to the lid 11 together with the attachment member 13, and has a notched groove 26 so that the notch groove 26 can be inserted from the inside through the member 13 and the attachment means 15. Have.

The above-mentioned plug 27 has a lower male thread 28 screwed into the female thread 12 from above, and closes the opening of the female thread 12 by itself. A cap portion 29 having a larger diameter is provided at the upper end of the lower male screw portion 28 to determine a screwing limit.

The cover opening tool 30 has a lock member engaging portion 31 and an embolus engaging portion 32. Engageable mating members 33 and 34 which can be engaged with these engaging portions 31 and 32 are It can be provided on the upper end of the shaft and on the upper surface of the plug 27. The engaging portions 31 and 32 that can be engaged with the mating partners 33 and 34 have a specific shape and structure to be fitted with each other, but cannot use easily available tools such as a + -driver. It is desired that Illustrative examples are those having a bifurcated engagement structure and those having a hexagonal shaft. In the case of the lock member 20, one of the two forks indicates the direction of the lock portion 23, so that it is easy to understand.

As described above, the lid opening tool 30 is provided with the engaging portions 31 and 32 from which the lock member 20 and the plug 27 can be removed.
However, at the same time, the internal thread 1
2 and becomes a handle for opening the lid. The external thread 35 is provided at one end of the lid opening tool 30.
For this reason, the illustrated lid-opening tool 30 has a T-shape, the screw portion 35 at the tip of the longitudinal axis 36, the engaging portion 31 at one end of the T-shaped handle 37, and another engaging portion at the other end. It has a part 32.

In such a lock device, the lock member 23 having the upper male screw portion 21 screwed into the female screw portion 12 has the lock portion 23 facing outward in a state where the lock member 20 receives a resistance that does not easily move, thereby protecting the lock member. The body 25 is inserted into the cover 11 by tightening bolts. When the lock portion 23 correctly faces outward, the engagement partner 33 points to the lock mark 38 of the lid 11 (see FIG. 7). To open the lid 11, the lock member 20 is rotated in any direction so that the position of the mating partner 33 is adjusted to the lid opening indicator 39.

The opening of the lid receiving frame 10 is closed and the locking member 2 is closed.
When 0 is in the locked state, an embolus 27 is attached to the opening on the upper surface of the female screw portion 12 (or the female screw portion 12 of the mounting hole 14) and closed (see FIG. 2). In addition, the female screw portion 12 (or the female screw portion 12 of the mounting hole 14) at the place where the lock device is not used is similarly closed (see FIG. 5). The locking operation by the locking member 20 and the attachment or removal of the embolus 27 are all performed using the lid opening tool 30. The engagement structure (31, 32, 33, 34)
Is unique and cannot be operated with ordinary tools such as a screwdriver, so safety is high. In each of the figures, reference numeral 41 denotes a fall prevention net arranged at the opening of the lid receiving frame 10, which is placed on the receiving portion 40 in the opening by the frame.

[0026]

Since the present invention is constructed and operates as described above, the lid can be easily and more securely locked to the lid receiving frame by the lock members provided at a plurality of positions, and The locked state can be released only by a special tool with an engaging part having two types of shapes and structures,
In addition to enhancing safety, all operations such as operating the lock device, attaching / detaching the embolus, opening / closing the lid, etc. cannot be performed unless the lid opening tool has two dedicated shapes and structures. When the device is not attached, it is possible to obtain an effect that the safety can be remarkably enhanced at the same time when the device is closed with the embolus.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of manholes to which a locking member and an embolus attaching / detaching device according to the present invention are applied.

FIG. 2 is a sectional view of the same.

FIG. 3 is a partial plan view of manholes to which the apparatus according to the present invention is applied.

FIG. 4 is a front sectional view corresponding to FIG. 3;

FIG. 5 is a partial plan view of the device mounting portion of the present invention when locked, as viewed from the upper surface of the lid.

FIG. 6 is a partial plan view at the time of unlocking;

Claims (5)

[Claims] 1. A locking device for fixing a lid to the lid receiving frame, the lid closing an opening of the lid receiving frame so as to be openable and closable,
A screw portion for providing a plurality of screws on the cover portion located inside the opening edge with the opening closed, and an upper male screw portion screwed into the female screw portion from below, the rotation of the screw around the cover receiving frame A lock member for setting a lock state engageable with the side;
It has a lower male thread that is screwed into the female thread from above,
An embolus for closing the female thread is also screwed into the female thread to serve as a handle for the opening operation, and is capable of engaging with an engagement partner provided on the lock member and the embolus when removing the lock member and the embolus. A lock in a manhole cover, comprising a lid opening tool having a joint portion, wherein a shape and a structure of an engagement partner of the lock member and the plug are in a shape and structure that cannot be shared by one type of engagement portion. Device for attaching and detaching members and emboli. 2. The lid has a vertically penetrating mounting hole,
2. The device for attaching and detaching a lock member and an embolus in a manhole cover according to claim 1, wherein a mounting member having an internal thread portion is fitted therein. 3. An upper end of an external thread of a lock member screwed into an internal thread and an upper end of an embolus can be engaged only with an engaging portion of a lid opening tool, and are different in shape and structure. 2. The device for attaching and detaching a lock member and an embolus in a manhole cover according to claim 1, wherein an engagement partner is formed. 4. A lock in a manhole cover according to claim 1, wherein a resistance member for applying resistance to the lock member and stopping the lock member at an arbitrary position is interposed between the lock member and the lid provided with the female screw portion. Device for attaching and detaching members and emboli. 5. A lock member protector that bears the weight of the lid or protects the lock member from impact.
An attachment / detachment device for a lock member and an embolus in the manhole cover described in the above.