JP3870381B2 - Manhole cover handle hole cover device - Google Patents

Description

The present invention relates to a cover device for a handle hole of a manhole cover that closes a handle hole for opening and closing the manhole cover.

The manhole cover is usually fitted with a cover device in a handle hole provided on the upper surface of the manhole so that only a worker can easily open it for reasons such as safety and security. When the manhole cover is opened, the cover device is first removed, and then the manhole is opened by lifting the manhole with an instrument such as a bar inserted into the handle hole.

As a cover device that closes the handle hole, a cylindrical stopper material that is attached to the upper surface of the through hole that becomes the handle hole and an expansion body, and is inserted into the through hole in between is provided with a cylindrical shape. When an elastic body is interposed, a screw rod is inserted into the stopper material, elastic body, and expansion body in this state, and a nut is screwed into the lower portion of the screw rod to integrate them. By tightening the stopper material, the elastic body is pushed and spread, and the through hole is closed to fix the whole (see Patent Document 1).

As another cover device, there are a disk portion provided with a positioning projection on the back surface side to be fitted in a positioning recess provided on the upper surface of the manhole cover, a main body having a lower portion provided with a cylindrical outer peripheral surface portion, and a main body. There is a clamp hole that has a male screw on the lower side to be inserted and a clamping nut that extends and molds a fixing claw to fix it in contact with and separate from the manhole cover. When closing the key hole, the positioning protrusion is fitted into the recess of the manhole cover, the lower part of the main body is inserted into the key hole of the manhole cover, and the fixing claw is rotated by rotating the main shaft. Can be tightened by further rotating the main shaft in a state of engaging with the lower surface side hole edge of the key hole, and the whole is fixed and the key hole is closed (Patent Document 2).

As another cover device, a disk having a tightening hole on the upper surface side and a disk-shaped disk having an insertion hole for inserting the head of the bolt and closing the handle hole of the manhole cover A cap having a portion, a through hole for inserting a bolt and a female screw for screwing a male screw of the bolt, and a locking portion for locking to the handle hole when rotating in the handle hole and the manhole cover A rotating body that has a contact surface that can be contacted to the lower surface side and is provided so as to prevent upward pulling, and the rotating body when the bolt is rotated with the locking portion locked in the handle hole. Is provided so as to move either up or down along the bolt (see Patent Document 3).

However, in the through hole closing device for a manhole cover disclosed in Patent Document 1, the portion to which a tightening force is applied is an elastic body formed of a material rich in elasticity such as rubber, so that it easily deteriorates and gradually increases due to wear or the like. There was a problem in terms of durability, such as loss of the elastic force. Also, in order to securely attach the elastic body to the through hole, when operating the jig for tightening, the effect cannot be exerted unless the elastic body is firmly tightened until it elastically contacts the through hole. In addition to the more severe deterioration of the body, the degree of tightening of the jig is difficult to understand, and there are cases where problems arise in operability such as difficulty in tightening.

In the keyhole blind plug device disclosed in Patent Document 2, when the sludge or the like enters the positioning recess on the lid side, the disk portion is used when the disk portion is to be fitted into the recessed portion of the manhole cover. The positioning protrusion on the side may not be securely fitted into the positioning recess, and tightening work may be difficult. Therefore, depending on how the manhole cover positioning part is attached, the reliability of the tightening work may be lacking, and it is necessary to perform the tightening work after the convex part is fitted in the concave part. Sometimes this happened.

Although the cover device for the handle hole of the manhole cover disclosed in Patent Document 3 has a certain improvement in durability and operability at the time of tightening, since the number of components is large as a whole, the manufacturing and assembly cost is high. It is expensive.

Japanese Utility Model Publication No. 7-16768 Japanese Patent No. 2889203 JP 2003-239309 A

An object of the present invention is to provide a manhole cover handle hole that has a necessary and sufficient locking function, but can reduce the total number of components to the limit, thereby reducing the cost of manufacturing and assembling. It is to provide a cover device.

The cover device for a handle hole according to the present invention is inserted into the handle hole 2 of the manhole cover 1 and has an inverted U-shaped cap 4 that closes the upper surface opening 3 of the handle hole 2, and one side plate portion 5 of the cap 4. A lock plate 8 that is rotatably connected to the bracket plate portion 6 formed by the horizontal support shaft 7 and that protrudes and rotates to the outside of the side plate portion 5 due to its own bias load about the horizontal support shaft 7; 4 and an operation key 11 inserted from a key hole 10 formed in the upper surface plate portion 9.
A nose portion 13 that engages with and disengages from the overhang wall 12 on the inner surface of the handle hole 2 is formed on the lock plate 8, and a passive plate portion 15 that is pushed by the drive protrusion 14 of the operation key 11 is formed on the upper end portion of the lock plate 8. When the cap 4 is inserted into the handle hole 2, a cam slope 16 that is pushed by the hole edge 2a of the handle hole 2 is formed on the lower side surface portion of the nose portion 13, and overhangs when the lock plate 8 protrudes and rotates. A stop surface 17 that faces the wall 12 is formed on the upper side surface portion of the nose portion 13.

The cover device for a handle hole according to the present invention is inserted into the handle hole 2 of the manhole cover 1 and has an inverted U-shaped cap 4 that closes the upper surface opening 3 of the handle hole 2, and one side plate portion 5 of the cap 4. A lock plate 8 that is rotatably connected to the bracket plate portion 6 formed by the horizontal support shaft 7 and that protrudes and rotates to the outside of the side plate portion 5 due to its own bias load about the horizontal support shaft 7; 4 and the operation key 11 inserted from the key hole 10 formed in the upper surface plate portion 9, and the number of components as a whole is reduced to the limit, so that the cost of manufacturing and assembling is greatly reduced. Is done.

In the cover device for a handle hole of the present invention, the nose portion 13 that engages with and disengages from the overhang wall 12 on the inner surface of the handle hole 2 is formed on the lock plate 8, and the side plate portion 5 is caused by its own weight. When the outsider tries to lift the cap 4 without permission, the stop surface 17 facing the overhang wall 12 is formed on the upper side surface portion of the nose portion 13. Since such a pulling operation is stopped by the contact of the stop surface 17 of the portion 15 with the overhang wall 12, this cover device has a necessary and sufficient locking function for a manhole cover.

The cap 4 is locked by the nose portion 13 of the lock plate 8 when the cap 4 is inserted into the handle hole 2, the cam slope 16 of the nose portion 13 is pushed by the hole edge 2 a of the handle hole 2, Since the lock plate 8 automatically protrudes and rotates outward due to its own bias load in the end region of the insertion operation of the cap 4 after being retracted and rotated inside the face plate portion 5, a special It does not require a locking operation and is excellent in the ease of operation.

Further, the lock 4 is unlocked by the lock plate 8 by inserting the operation key 11 from the key hole 10 of the upper surface plate portion 9 of the cap 4 and the drive protrusion 14 of the operation key 11 to the passive plate portion 15 of the lock plate 8. The lock plate 8 is rotated around the horizontal support shaft 7 by turning the operation key 11 and the nose portion 13 is retracted and rotated inside the side plate portion 5 of the cap 4. Locking operation is also easy.

In the embodiment shown in FIGS. 1 to 5, the cap 4 is formed by pressing a metal plate, and is composed of a pair of side surface plate portions 5 and 18 and an upper surface plate portion 9 that communicates between them. The bracket plate portion 6 is formed by bending one side plate portion 5 at a right angle toward the inner space of the cap 4. The lock plate 8 made of a metal plate is formed in a substantially parallelogram shape, the shaft hole 19 through which the horizontal support shaft 7 passes is formed at the lower end portion of the lock plate 8, and the center of gravity of the lock plate 8 is the shaft hole 19 and the nose portion. It comes to come between thirteen. Due to the biased load about the horizontal support shaft 7, a counterclockwise rotational moment in FIG. 5 is always applied to the lock plate 8, and the lock 4 is locked when the cap 4 is taken out from the handle hole 2. The plate 8 rotates automatically by its own weight, and the nose portion 13 protrudes outside the side plate portion 5.

The passive plate portion 15 of the lock plate 8 is bent at a right angle at the upper end portion of the lock plate 8. The passive plate portion 15 stands by in the space below the key hole 10 in the locked state. The drive protrusion 14 is formed at the tip of the operation key 11 made of a metal plate. When the operation key 11 is turned, the drive protrusion 14 pushes the passive plate portion 15 of the lock plate 8 as shown in FIG. By this pushing operation, the lock plate 8 rotates around the horizontal support shaft 7, and the nose portion 13 is drawn into the inner space of the cap 4.

The inner back portion 20 of the handle hole 2 of the manhole cover 1 is formed wider than the upper surface opening 3, and the overhang wall 12 at the boundary between the inner back portion 20 and the upper surface opening 3 is formed inside the handle hole 2. It is formed parallel to the bottom surface. Almost the majority of the lower surfaces of the pair of side plate portions 5 and 18 of the cap 4 are in contact with the inner bottom surface 2 b of the handle hole 2. In a state in which the nose portion 13 protrudes and rotates, the cam slope 16 is in contact with the positioning receiving portion 22 at the base portion of the bracket plate portion 6.

6 to 7, the dimensional shape of the cap 4 is appropriately changed according to the shape of the inner surface of the handle hole 2 of the manhole cover 1 to which the cover device of the present invention is applied. Although the inner back part 20 of the handle hole 2 of the manhole cover 1 is formed wider than the upper surface opening 3, the overhang wall 12 at the boundary between the inner back part 20 and the upper surface opening 3 is The handle hole 2 is inclined with respect to the inner bottom surface. Only a part of the lower surfaces of the pair of side plate portions 5 and 18 of the cap 4 is in contact with the inner bottom surface 2 b of the handle hole 2.
Since other configurations and operations are the same as those in the above embodiment, the description thereof is omitted.

It is a principal part top view of the manhole cover to which the cover apparatus for handle holes which concerns on one Example of this invention is applied. It is a principal part longitudinal cross-sectional view of the manhole cover of FIG. It is a principal part side view of the manhole cover of FIG. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is a principal part top view of the manhole cover to which the cover apparatus for handle holes which concerns on another Example of this invention is applied. It is a principal part longitudinal cross-sectional view of the manhole cover of FIG. It is a principal part side view of the manhole cover of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Manhole cover 2 Handle hole 2a Hole edge part 2b of handle hole Inner bottom face of handle hole 3 Upper surface opening part of handle hole 4 Cap 5 Side plate part 6 Cap side bracket part 7 Horizontal support shaft 8 Lock plate 9 Top plate portion 10 of the cap Key hole 11 Operation key 12 Overhang wall 13 of the handle hole Nose portion 14 of the lock plate Drive projection 15 of the operation key Passive plate portion 16 of the lock plate Nose cam slope 17 Nose stop surface 18 Side plate portion 19 of cap 19 Shaft hole 20 of lock plate Inner inner portion 21 of grip hole Manhole fixing frame 22 Cap positioning receiving portion

Claims (1)

A cap 4 having an inverted U-shaped cross section that is inserted into the handle hole 2 of the manhole cover 1 and closes the upper surface opening 3 of the handle hole 2, and a bracket plate portion 6 formed on one side plate portion 5 of the cap 4. A lock plate 8 that is rotatably connected to the horizontal support shaft 7 and that protrudes and rotates to the outside of the side surface plate portion 5 due to its own biased load about the horizontal support shaft 7, and a key formed on the upper surface plate portion 9 of the cap 4. The operation key 11 is inserted through the hole 10, and
A nose portion 13 that engages with and disengages from the overhang wall 12 on the inner surface of the handle hole 2 is formed on the lock plate 8, and a passive plate portion 15 that is pushed by the drive protrusion 14 of the operation key 11 is formed on the upper end portion of the lock plate 8. When the cap 4 is inserted into the handle hole 2, a cam slope 16 that is pushed by the hole edge 2a of the handle hole 2 is formed on the lower side surface portion of the nose portion 13, and overhangs when the lock plate 8 protrudes and rotates. A cover device for a handle hole of a manhole cover in which a restraining surface 17 facing the wall 12 is formed on the upper side surface portion of the nose portion 13.

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