JPH0615127Y2 - Tightening bolt - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a fastening bolt incorporating a clutch mechanism for fastening and fixing a fastened member such as a manhole lid so that an unskilled person cannot remove it.

[Conventional technology]

When fastening a fastened member such as a manhole lid to a fastening member such as a lid receiving frame, a standard fastening bolt in which a bolt screw portion and a bolt head are integrated is conventionally used.

[Problems to be solved by the device]

The conventional tightening bolt has a square-shaped head, for example, a hexagonal head defined by JIS standards, and a rotary tool such as a spanner that fits the head of the bolt and can be easily obtained by anyone. Easy to use and remove. For this reason, a member to be fastened (fastened member such as a manhole cover, which is difficult for a person other than a predetermined person to remove), to be fastened and fixed by the fastening bolt is removed by an unscrupulous person. There was a problem and another locking device was needed to eliminate this problem.

The present invention was devised with the above circumstances in mind, and its purpose is to rotate the head cap manually or by using a rotating tool such as a spanner that anyone can obtain. Even if the bolt body fixing the member to be fastened cannot be rotated, only the specific operator who has the dedicated wrench with magnet can rotate the bolt body. The purpose of the present invention is to provide a fastening bolt having a special structure incorporating a mold clutch mechanism.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the fastening bolt of the present invention has a circular bolt head and a bolt wrench on the outside of the head of the bolt body which is retained by a locking means so that it can be rotated. A magnetic force that is incorporated between the head cap and the bolt body and is assembled between the head cap and the bolt body so that the bolt body and the head cap are integrally rotatably connected only when the head cap is rotated by a dedicated wrench with a magnet. It is configured to include a response type clutch mechanism.

The circular head portion of the bolt main body can have a diameter larger than the diameter of the bolt screw portion, but when the diameter is the same as or smaller than the diameter of the bolt screw portion, the member to be fastened is fastened to the mounting member. In order to be able to do so, it is desirable that a member fastening flange portion is provided at a lower position of the head portion, and a clutch mounting hole is recessed in an end surface of the circular head portion.

Further, the head cap has a circular fitting hole rotatably fitted to the outside of the head of the bolt body and locking means for preventing the bolt from coming off from the head of the body. In order to simplify and smoothly perform magnetic force response, a clutch connecting hole is formed in the inner end surface portion of the fitting hole that matches the clutch mounting hole of the main body head. A movable clutch that is formed of a lid, and is capable of attracting and retracting a magnet is installed in a clutch mounting hole of the bolt body so that the head cap can be retracted and moved. It is preferable that the head cap and the bolt main body are integrally rotatably connected to each other by being pulled up by a magnetic attraction action so as to be partially fitted into the clutch connecting hole that matches the clutch mounting hole.

Furthermore, in order to ensure that the bolt rotation operation can be performed securely, the head cap is a hexagon cap nut made of non-ferrous metal, and the hexagon hole of a dedicated wrench with magnet is fitted on the outside of the hexagon cap nut. It can also be rotated.

[Action]

According to the tightening bolt having the above-mentioned structure, even if an inexperienced person who does not have a dedicated wrench with a magnet rotates the head cap to remove the bolt body, the head cap only idles and the bolt body does not rotate. For this reason, a member (unskilled person) other than a specific worker cannot remove the fastened member such as the manhole cover.

Thus, when a specific worker having a dedicated wrench with a magnet removes the bolt main body as necessary, the dedicated wrench with a magnet is fitted to the head cap and the cap is slowly rotated. , When the clutch connecting hole of the head cap coincides with the clutch mounting hole of the head of the main body, the moving clutch is pulled up by the attraction action of the wrench magnet, and the moving clutch is partially inserted in the clutch connecting hole of the head cap. Therefore, when the clutch is engaged, the head cap and the bolt main body are linked so as to rotate integrally, and the fastening bolt can be easily removed by rotating the dedicated wrench as it is in the bolt loosening direction.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings. In the figure, reference numeral 1 denotes a bolt main body composed of a circular head 2, a member fastening flange portion 3 and a bolt screw portion 4 under the head. The circular head 2 of No. 1 is formed to have a diameter substantially the same as the diameter of the bolt screw portion 4, an outer peripheral surface of which is surrounded by an annular groove 5, and a head end surface of which is provided with a clutch mounting hole 6 which is open to the outer peripheral surface. It is recessed as shown.

Reference numeral 7 denotes a circular fitting hole 8 rotatably fitted to the outside of the head 2 of the bolt body 1 and a driving pin 9 as locking means for preventing the bolt 2 from coming off from the body head 2. A head cap having a plurality of driving pins (engaging at the tip end). The head cap 7 has a main body head 2 at the inner end surface of the fitting hole 8.
The rectangular clutch connecting hole 10 matching the clutch mounting hole 6 is formed by a non-magnetic lid made of a non-magnetic material (stainless steel, brass, bronze, etc.) that allows the magnetic force to pass but does not magnetize. In the case of the present embodiment, the head cap 7 is a hexagonal cap nut made of non-ferrous metal such as stainless steel, brass and bronze, and the hexagonal hole C of the dedicated wrench B with the magnet A is shown in FIG. It can be fitted and rotated like this.

Reference numeral 11 denotes a moving clutch composed of an iron piece moving element capable of attracting magnets which constitutes a magnetic force responsive clutch mechanism. As shown in FIG. 4, when the head cap 7 is rotated by the dedicated wrench B with the magnet A, it is partially inserted into the clutch connecting hole 10 that matches the clutch mounting hole 6 by the magnetic attraction of the wrench magnet A. When the head cap 7 and the bolt body 1 are pulled up, the head cap 7 and the bolt body 1 can be integrally rotatably connected to each other. It should be noted that in the above-described embodiment, the case where the cap locking means is formed by the plurality of driving pins 9 which engage with the head outer peripheral annular groove 5 has been described, but the cap locking means is limited to the driving pin 9. The same purpose can be achieved by adopting any structure as long as the head cap 7 can be rotationally coupled so as not to come off from the main body head 2.

FIG. 3 shows a use state diagram in which a fastened member D such as a manhole lid is fastened and fixed to a mounting member E such as a lid receiving frame by using the fastening bolt of the present invention.
In the tightened state, the moving clutch 11 is set in the clutch mounting hole 6 of the main body head 2 so that the head cap 7 can freely rotate.
Even if an inexperienced person who does not have an attempt to remove the bolt body 1 by rotating the cap 7, the head body 7 only idles and the bolt body 1 does not rotate. Therefore, the tightened member D such as the manhole cover cannot be removed by a person other than a specific worker (unskilled person).

Therefore, when a specific operator having the dedicated wrench B with the magnet A removes the bolt body 1 as necessary,
When the dedicated wrench B with a magnet is fitted into the head cap 7 and the cap 7 is slowly rotated, the head cap 7
When the clutch connecting hole 10 of is aligned with the clutch mounting hole 6 of the main body head 2, the moving clutch is attracted by the wrench magnet A.
11 is pulled up, and this moving clutch 11 moves to the head cap 7.
As shown in FIG. 4, the head cap 7 and the bolt main body 1 are integrally connected to each other so that the head cap 7 and the bolt main body 1 are integrally rotated by inserting the clutch into the clutch connecting hole 10 of FIG. The tightening bolt can be easily removed by rotating it.

In addition, in the above-mentioned embodiment, in order to surely perform the bolt rotation operation, the head cap 7 is a non-ferrous metal hexagon cap nut, and the hexagonal hole C of the dedicated wrench B with a magnet is provided outside the hexagon cap nut. I made it possible to rotate by mating,
The cap 7 is a circular lid, a plurality of engaging holes are provided on the top end surface of the circular lid, and a lower end protrusion (not shown) of a dedicated wrench B with a magnet is engaged with the engaging holes for rotational operation. It can also be configured as follows.

[Effect of device]

The fastening bolt of the present invention is a magnetically responsive clutch between the rotatable head cap and the bolt body, which allows the bolt body and the head cap to be integrally rotatable only when the head cap is rotated by a dedicated wrench with a magnet. Since the mechanism is built in, the head cap can be rotated using a manual rotation operation or a rotating tool such as a spanner that anyone can obtain, but the member to be fastened can be fastened and fixed. Since it is not possible to rotate the bolt body, the problem that the bolt body is removed by an inexperienced person who does not have a dedicated wrench with a magnet can be solved. Also, when a specific worker who has a dedicated wrench with a magnet removes the bolt, by operating the magnetic force response type clutch mechanism with the dedicated wrench, the bolt body and the head cap can be integrally rotated. The fastening bolts can be easily removed by connecting them.

[Brief description of drawings]

FIG. 1 is a front view of a notched portion of a fastening bolt of the present invention, FIG. 2 is a plan view of the fastening bolt, FIG. 3 is a usage state diagram of the fastening bolt, and FIG. It is an operation explanatory view showing the state where a tightening bolt is removed with a wrench. DESCRIPTION OF SYMBOLS 1 ... Bolt main body, 2 ... Head part, 3 ... Member fastening flange part, 4 ... Bolt screw part, 5 ... Annular groove, 6 ... Clutch mounting hole, 7 ... Head cap, 8 ... Circular fitting hole, 9 ... Driving pin as locking means, 10 ... clutch connecting hole, 11 ... moving clutch, A ... magnet, B ... dedicated wrench with magnet, C ... hexagonal hole.

Claims (3)

[Scope of utility model registration request] 1. A bolt main body having a circular head portion, and a head cap fitted to the outside of the head portion of the bolt main body by locking means so as to be fitted and locked so as to be rotatable by a dedicated wrench with a magnet. A magnetic force responsive clutch mechanism is incorporated between the head cap and the bolt main body, and the bolt main body and the head cap are integrally rotatably connected only when the head cap is rotated by a dedicated wrench with a magnet. Tightening bolt. 2. The bolt body has a circular head portion, a flange portion for fastening a member below the head portion, and a bolt screw portion, and a clutch mounting hole is formed in a recess on the end surface of the circular head portion. The cap has a circular fitting hole that is rotatably fitted to the outside of the head of the bolt body, and locking means that prevents the cap from coming off from the head of the body. A magnet that is formed by a non-magnetic lid that allows a magnetic force to pass through but does not magnetize in a structure in which a clutch connecting hole that matches the clutch installing hole is recessed, and that the clutch mechanism is incorporated in the clutch installing hole of the bolt body so that the clutch mechanism can move in and out. Equipped with a moving clutch that can suck
When the moving clutch is rotated by a dedicated wrench with a magnet, the moving clutch is pulled up by the magnetic attraction of the wrench magnet so that it partially fits into the clutch connecting hole that matches the clutch mounting hole. The fastening bolt according to claim 1, wherein the bolt body is configured so as to be integrally rotatably connected to each other. 3. The head cap is a hexagonal cap nut formed of non-ferrous metal, and the hexagonal cap nut is fitted with a hexagonal hole of a dedicated wrench with a magnet for rotation. The fastening bolt according to claim 2, which is characterized in that.