JP2000324668A - Stop valve with lock for cable duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a stop valve for cable duct which cannot be removed freely by a third person by employing such a structure as the stop valve can be tightened or loosened only through use of a dedicated jig. SOLUTION: The stop valve A comprises a pair of press members 2, 3 arranged on the opposite sides of a bolt shaft 1, an annular elastic rubber 4 sandwiched between both press members 2, 3, and a tightening nut 5 screwed from the rear end part 1b of the bolt shaft 1 wherein the elastic rubber 4 is pressed to expand and adhere to the inner circumferential surface of a duct C. The stop valve A further comprises a handle body 7 coupled with the tightening nut 5 and extending axially outward from the rear end part 1b of the bolt shaft 1 to the opening 7d. A lock nut 8 comprising a circular cap nut following the tightening nut 5 of the bolt shaft 1 is screwed into the handle body 7 and a plurality of engaging holes 9 for a tightening/loosening jig are provided in the rear end face of the lock nut 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water stopcock for closing an opening of a cable conduit for laying various cables such as a communication line and a power line underground, and particularly to a water stoppage having a lock function. It is about a stopper.

[0002]

2. Description of the Related Art A cable conduit is buried underground so as to communicate between manholes provided at a predetermined interval. A plurality of conduits are provided between the manholes, and each conduit opens into the manhole. Usually, openings are provided in parallel in a plurality of rows and columns. The cable is inserted into the conduit in use, and the opening is closed by padding around the cable.

On the other hand, if an unused empty pipeline is left open, rainwater that has entered the manhole flows into the pipeline and stays there, causing corrosion, etc., and a new cable is inserted. It becomes an obstacle in case. Therefore, the opening of the empty pipeline is closed by the insertion of the water stopcock.

[0004] As a water stopcock at the pipe opening, as proposed by the present applicant (for example, Japanese Utility Model Publication No. 2-14262).
Japanese Patent Application Laid-Open No. H11-157, a pair of pressure members arranged so that at least one of them is slidable in the axial direction about a bolt shaft, a rubber elastic body interposed between the two pressure members, A tightening nut screwed from a rear end portion. The tightening of the tightening nut squeezes the rubber elastic body between the squeezing members so that the rubber elastic body swells and deforms so as to be in close contact with the inner peripheral surface of the pipeline. Is known.

[0005] The use of the cable conduit is determined according to the type of the communication cable, for example, for a wide area or a local area, and an empty conduit is also reserved for a wide area or a local area. Often.

However, when a cable is to be laid in a pipeline secured for a wide area or the like, for example, the water stopcock of the pipeline is already removed by a third party (an operator of another cable) and the water stopcock is removed. There was a case where a pipe was used without permission and another cable was laid.

Particularly, in the water stopcock having the above-described structure, in the case of a type in which a handle body is connected and connected to the tightening nut in order to facilitate the tightening and loosening operation of the tightening nut, the tightening and loosening operation is easy. For some reasons, it was easily removed without permission.

SUMMARY OF THE INVENTION In view of the above, the present invention provides a water stopcock as described above, in which a tightening nut and a locking nut are used in order to prevent a third party from using an empty conduit of a cable conduit without permission. And a lock nut with a lock that prevents the lock nut from being removed without the need to use a special locking jig for locking. To provide.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a water stopcock inserted into an opening of a cable conduit, wherein at least one of the waterstops is slidable in the axial direction about a bolt shaft. A pressing member, an annular rubber elastic body interposed between the pressing members, and a tightening nut screwed from a rear end of the bolt shaft. As a means for solving the above-mentioned problems, in the water stopcock that presses the rubber elastic body between the pressing members to swell and deform so as to be in close contact with the inner peripheral surface of the conduit, A handle body extending axially outward from the rear end of the bolt shaft and opening therewith, inside the handle body, a locking nut is screwed into the bolt nut following the tightening nut of the bolt shaft; Do not provide a plurality of engagement holes for fastening jigs on the rear end face of It is characterized in.

According to this water stopcock, in the state of being inserted into the opening of the empty conduit, the tightening nut screwed to the bolt shaft is tightened, and the subsequent locking nut is provided on the rear end face. Tightening is performed using a dedicated tightening and loosening jig that is freely engageable with the engaging hole, and the tightening nut is held in a locked state. Thus, the turning operation of the handle body by a third party can be prevented.

In addition, the locking nut is located inside the handle body, and cannot be tightened or loosened from the outside in the radial direction with a normal tool such as a spanner or a wrench. That is, unless a dedicated tightening and loosening jig that engages with an engaging hole provided on the rear end surface of the lock nut is used, the lock nut cannot be loosened, and the lock nut can be favorably held in the locked state. It is possible to prevent three persons from removing the water stopcock and using the pipe without permission.

When removing the water stopcock, the locking nut is first loosened using a special tightening / loosing jig that engages with a plurality of engagement holes provided on the rear end face of the locking nut.
In this state, the fastening nut may be loosened by the handle body.

As the lock nut, a lock nut having a circular cap nut is particularly preferable in order to prevent a turning operation by another tool from the opening side of the handle body.

[0014] Further, the handle body extends in the axial direction of the bolt shaft from the coupling portion to the tightening nut and is expanded toward the open end, and the handle is connected to the end of the cylindrical portion and opened. The locking nut, which is screwed to a bolt shaft, is located in the cylindrical portion at the time of tightening, and the rear end portion is expanded so as to reduce the gap with the inner peripheral surface of the cylindrical portion. Those formed with a diameter are preferred. As a result, the outer periphery of the lock nut inside the handle body is
It is almost impossible to rotate the handle by grasping it with another tool from the opening side of the handle body, and the effect of preventing removal by a third party is further enhanced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described based on embodiments shown in the drawings.

FIG. 1 is a longitudinal sectional view of an embodiment of a water stopcock (A) according to the present invention in use, and FIG. 2 is a perspective view from the handle side. FIG. 3 is an enlarged sectional view of a portion tightened by a nut, FIG. 4 is a front view of the same, and FIG. 5 is a perspective view of a fastening jig. 6 and 7 are partial cross-sectional views each showing another embodiment of the locking nut.

First, the main structure of the water stopcock (A) will be described. (1) is a bolt axis serving as a central axis, (2)
(3) is a pair of disk-shaped pressing members provided at least one of which is slidable in the axial direction on the bolt shaft (1), and is made of a rigid synthetic resin material or a metal material. The one pinching member (2) engages with and engages with the rectangular (hexagonal) head (1a) of the bolt shaft (1) so that it cannot pass therethrough, thereby rotating the bolt shaft (1) with respect to the bolt shaft (1). The other pressing member (3) is provided so as not to move, and is slidably provided in the axial direction with respect to the bolt shaft (1). (4) is an annular rubber elastic body interposed between the two pressing members (2) and (3), and is elasticized by being pressed by the two pressing members (2) and (3). It swells and deforms against the force to expand its diameter.

Reference numeral (5) denotes a tightening nut formed of a hexagonal nut or other square nut screwed from the rear end to the bolt shaft (1). The pressing member (3) is replaced with the other pressing member (2).
Is provided so that the rubber elastic body (4) can be pressed. (6) is a washer provided between the clamping member (3) and the tightening nut (5).

(7) an operating handle body which is engaged and connected to the tightening nut (5) and extends axially outward from the rear end of the bolt shaft (1) to open; The tightening nut (5) can be tightened and loosened by the body (7). As shown in the figure, the handle body (7) extends rearward in the axial direction of the bolt shaft (1) from the joint (7a) with the tightening nut (5), and becomes tapered or trumpet toward the opening. The cylindrical portion (7b) has a gradually enlarged diameter, and a large-diameter handle portion (7b) is provided at an open end of the cylindrical portion (7b).
c), and the handle portion (7c) is open (7d) toward the rear in the axial direction.

Further, inside the handle body (7), a locking nut (8) is screwed so as to be able to be tightened after the tightening nut (5) of the bolt shaft (1),
Particularly, it is provided so as to be located inside the cylindrical portion (7b) in the tightened state. In the case of the embodiment shown in the figure, a locking nut (8) having a rear end portion (1b) of the bolt shaft (1) terminating at the cylindrical portion (7b) of the handle body (7) and an outer periphery formed of a circular cap nut. Are screwed into the rear end (1b) of the bolt shaft (1).

The locking nut (8) has a rear end face (8
a), that is, on the end face of the handle body (7) that is exposed toward the opening (7d), a plurality of, for example, as shown in FIG. Are provided with engaging holes (9) for three fastening jigs at equal angular intervals. Thereby, the arrangement of the engagement hole (9),
A plurality corresponding to the shape, for example, 3 as illustrated in FIG.
Using a dedicated fastening jig (B) having two engaging shafts (b1), the engaging shaft (b1) is fitted into the engaging hole (9) from the opening (7d) side and engaged. By doing so, the locking nut (8) can be tightened and loosened from the axial outside of the opening (7d) of the handle body (7).

The locking nut (8) is formed such that its rear end has an enlarged diameter so as to reduce the gap between the locking nut and the inner peripheral surface of the cylindrical portion (7b). (8b) shows the large diameter part. As the diameter-expanded shape of the large-diameter portion (8b), as in the embodiment shown in FIGS. 1 to 4, the outer peripheral side is formed in a gradually thinner flange shape, and as shown in FIG. 7, or a tapered outer shape over the entire length of the nut as shown in FIG. 7, and a rear end formed with a large diameter. In any case, the same engagement hole (9) as described above is provided in the rear end surface (8a).

The fastening jig (B) includes:
Any form may be used as long as it has an engagement shaft (b1) that fits into the engagement hole (9). The number of the engagement holes (9) and the number of the engagement shafts (b1) of the fastening jig (B) can be increased as long as the number is more than one. It is preferable to use three or more odd numbers.

Further, as the lock nut (8), in addition to the cap nut described above, a normal square nut or circular nut through which the bolt shaft (1) is screwed and penetrated can also be used.
In order to prevent the tightening operation using other tools,
A cap nut as shown is preferable, and a nut having a circular outer periphery is preferable.

The water stopcock (A) configured as described above is
Opening (c) of an empty pipeline (C) opening in the manhole
1) is used to close off the lock nut (5), which is screwed to the bolt shaft (1) with the water stopcock (A) inserted into the opening (c1) as shown in FIG. ) Is tightened by the handle body (7) to bring the pair of pressing members (2) and (3) closer to each other, so that the two pressing members (2) and (3)
The rubber elastic body (4) in between bulges and deforms in the radial direction against the further elastic force, is brought into close contact with the inner peripheral surface of the pipe (C), and fixed in a sealed state.

Thus, the locking nut (8) subsequent to the tightening nut (5) is further tightened by the tightening and loosening jig (B). That is, the opening (7d) of the handle body (7)
An engagement hole (9) having an engagement shaft (b1) of the fastening jig (B) on the rear end surface (8a) of the lock nut (8) from the side of
The nut (5) is held in a locked state by being fitted into and engaged with and being rotated and tightened.

In this state, the turning operation by the manual operation with the handle body (7) cannot be performed. In addition, the locking nut (8) is connected to the inside of the handle body (7), in particular, the coupling portion (7a) with the tightening nut (5) and the handle portion (7).
c), the inside of the cylindrical portion (8b) is not allowed to be tightened or loosened from the outside in the radial direction. In addition, from the opening (7d) of the handle body (7), only the bag-side end surface (8a) is visible inside, and the locking nut (8) is grasped by a tool such as a spanner or a wrench. It is also difficult to perform the rotation operation.

In particular, as shown in the figure, the locking nut (8)
If the rear end of the nut is formed so as to reduce the gap with the inner peripheral surface of the cylindrical portion (7b), it is difficult to pry a tool into the gap on the outer periphery of the nut. Is a circular nut, it cannot be rotated even if the tool can be forced into the gap around the outer periphery of the nut. Therefore, it is almost impossible to rotate the handle body (7) by gripping it with another tool from the opening side, and the effect of preventing the third person from removing the handle is further enhanced.

Therefore, unless the exclusive fastening jig (B) is used, the locking nut (8) cannot be loosened, the locked state can be reliably maintained, and the third party can freely stop the water stopcock ( It is possible to prevent the use of the conduit (C) by removing A).

The main structure of the water stopcock (A), for example, the configuration of a rubber elastic body (4) and the configuration of a pair of pressing members (2) and (3) for pressing the same are shown in the illustrated embodiment. The other various structures in which the rubber elastic body (4) is swelled and deformed by tightening the tightening nut (5) in the same manner as described above so that the rubber elastic body (4) is brought into close contact with the inner peripheral surface of the pipeline. The water stopcock of the present invention can be implemented in the same manner as described above.

[0031]

As described above, according to the water stopcock with a lock for a cable conduit of the present invention, a double nut of a tightening nut and a locking nut is used, and the locking nut is a special exclusive nut. The structure is such that the tightening operation cannot be performed unless a tightening jig is used. This can prevent a third party from removing the water stopcock without permission.
Can eliminate problems used by people.

[Brief description of the drawings]

FIG. 1 shows a water stopcock with a lock for a cable conduit according to the present invention.
It is a longitudinal cross-sectional view of the use state which shows an Example.

FIG. 2 is a perspective view of the same as viewed from the handle opening side.

FIG. 3 is an enlarged sectional view of a nut fastening portion.

FIG. 4 is a front view of the same.

FIG. 5 is a perspective view showing an example of a fastening jig.

FIG. 6 is a sectional view showing another example of a lock nut.

FIG. 7 is a cross-sectional view showing still another example of a locking nut.

[Explanation of symbols]

 (A) Water stopcock (1) Bolt shaft (1a) Head (1b) Rear end (2) (3) A pair of clamping members (4) Rubber elastic body (5) Tightening nut (6) Washer ( 7) Handle body (7a) Coupling part (7b) Tube part (7c) Handle part (7d) Opening (8) Locking nut (8a) Rear end face (8b) Large diameter part (9) Engagement hole (B) Tightening jig (b1) Engagement shaft (C) Pipe (c1) Opening

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shinobu Nakata 3-9-25 Kyomachibori, Nishi-ku, Osaka-shi, Osaka F-term in Japan Civil Engineering Engineering Co., Ltd. 3H025 DA01 DB13 DC02 DD01 5G369 AA05 BA04 DC16

Claims (3)

[Claims] 1. A water stopcock to be inserted into an opening of a cable conduit, wherein at least one of the waterstops is axially slidable about a bolt axis, An annular rubber elastic body interposed between the pressure members, and a tightening nut screwed from a rear end of the bolt shaft, and the rubber elastic between the pressing members is tightened by the tightening nut. A water stopcock that squeezes a body to swell and deform to adhere to the inner peripheral surface of a pipe, wherein the handle is engaged with the tightening nut and extends axially outward from a rear end of the bolt shaft to open. Equipped with a body,
Inside the handle body, a locking nut is screwed behind the tightening nut of the bolt shaft, and a plurality of engagement holes for a tightening jig are provided on a rear end surface of the lock nut. A water stopcock with a lock for a cable conduit. 2. A water stopcock with a lock for a cable conduit according to claim 1, wherein said lock nut is a circular cap nut. 3. A handle portion extending from a coupling portion to the tightening nut in the axial direction of a bolt shaft and expanding toward an opening side, and a handle portion connected to an end of the tube portion and opened. And the locking nut screwed to the bolt shaft is located in the cylindrical portion at the time of tightening,
The stopcock with a lock for a cable conduit according to claim 1 or 2, wherein the rear end portion is formed so as to have a large diameter so as to reduce a gap between the rear end portion and the inner peripheral surface of the cylindrical portion.