JPS5920435Y2 - Manhole cover locking device - Google Patents

Description

[Detailed explanation of the invention] This invention places the manhole cover against the manhole support frame.
It is fixed by tightening bolts to prevent the manhole cover from rattling when a vehicle passes by, and the bolts for tightening the bolts are always kept closed by a locking device, so that the bolts cannot be unscrewed unless the locking device is unlocked. The cap makes it impossible to remove the manhole and prevents the manhole from being easily removed by an unauthorized person.The cap also protects the locking device from gas and rainwater. It is an object of the present invention to provide a locking device for a manhole cover that is easy to operate and whose parts can be easily replaced.

The invention will be described below with reference to the embodiments shown in the drawings.

FIG. 1 is a plan view of the manhole cover in the closed state, with the manhole cover locking device of this invention provided at three locations, and FIG. 2 is a plan view of the manhole cover in the open state.

FIG. 3 is an enlarged longitudinal sectional view taken along line XX in FIG. 1.

The invention will be explained as follows with reference to the above drawings.

A nut part 2 is fixed inside a manhole receiving frame 1 and positioned so that its screw hole 3 faces in the vertical direction.

A locking device opening (through hole) located above the screw hole 3 of the manhole cover 4 and communicating with the front and back of the manhole cover 4 is provided.
Form 5.

The through hole 5 is provided with a stepped portion 5b for engaging a head 6a of a bolt 6, which will be described later, and for forming a narrowed hole 5a through which the bolt 6 is inserted.

Insert the bolt 6 into the locking device through hole 5, and then press the bolt head 6.
The length of the bolt 6 is determined so that the tip of the bolt is screwed into the screw hole 3 of the nut portion 2 when the bolt 6 is supported by the stepped portion 5b.

The bolt head 6a has a locking portion 1 provided at the tip of a cylinder 11H of a cylinder lock 11 of a locking device 10, which will be described later.
2 is inserted into the fitting hole 7, and the locking part 12 is rotated by the key 13 inserted into the cylinder lock 6, and is placed on the side of the fitting hole 7 in order to lock into the bolt head 6a. A recessed engagement hole 8 is formed, and a locking hole 9 for an operating tool 14 for screwing in and unscrewing the bolt 6, such as a wrench, is provided at the bottom of the engagement hole 7.

A locking device 10 is fitted into the locking device hole 5 above the head of the bolt 6.

The locking device 10 is provided with a cylinder lock 11, the key insertion portion 11b of which is provided on the top surface, and the cylinder lock 11 is
13 protrudes from the lower surface and has a locking portion 12 protrudingly formed at its tip, and the locking portion 12 fits into the fitting hole 7 of the bolt head 6a.
It is shaped so that it is inserted into the locking hole 8 and rotated to be engaged with the locking hole 8.

A cap 1 is provided in the locking device hole 5 above the locking device.
Fit 5.

The upper surface of the cap 15 is configured to be the same as the upper surface of the manhole cover 4, and there are long and short sections 2 projecting downward from the lower surface of the cap 15.
The book shaft rods 16 and 17 are inserted into rod insertion holes 18 and 19 provided on the upper surface of the locking device 10, respectively, and the long rod 16 is constructed so that it cannot be removed from the rod insertion hole 18 of the locking device.

Reference numeral 20 denotes a handle for removing and removing the cap provided on the top surface of the cap 15, and is configured to be able to be raised and lowered.

In the above embodiment, the cap 15 is provided with two long and short shaft rods 16 and 17, and the shaft rod insertion holes 18 and 1 of the locking device are inserted, respectively.
9, the long shaft rod 16 is inserted into the shaft rod insertion hole 18 and cannot be removed from the shaft rod insertion hole 18. The cap 15 can be independently locked into and removed from the fitting hole 5 above the locking device, and a locking device removal handle such as the cap removal handle 20 is provided on the top surface of the locking device 10 (see FIG. In this invention, the manhole cover 4 is normally fixed to the manhole support frame 1 with bolts 6 as shown in FIG. 3, and the bolts 6 are locked and closed by a locking device 10. and the locking device 10
is covered with a cap 15.

To remove the manhole cover 4, as shown in FIG. 5, the cap is pulled up and rotated using the cap removal handle 20, or the cap 15, which is configured independently of the locking device, is removed.

If so, insert the key insertion hole 11 b of the cylinder lock 11 on the top surface.
Insert the key 13 into the key insertion hole 11b where the key appears, rotate the cylinder 11a from the state shown in FIG. 3 to the state shown in FIG. As shown, the cap 15 and the locking device 10 are both placed in the fitting hole 9 and pulled out from the locking device hole using the handle 20 for removing the cap, or the handle for removing the locking device is attached to the top surface of the locking device 10. (not shown) to pull it out from the locking device hole 5.

Next, as shown in FIG. 7, an operation tool 14 for screwing in and unscrewing the bolt 6, such as a wrench, is engaged with the locking hole 8 provided at the bottom of the fitting 7L7 of the bolt head 6a, and the screw is unscrewed. Then, the tip of the bolt 6 is removed from the nut portion 2, and the manhole cover 4 is removed from the manhole receiving frame 1.

Further, in order to fix and lock the manhole cover 4 to the manhole receiving frame 1, the state shown in FIG. 3 can be obtained by performing the reverse order as described above.

As described above, this invention fixes the manhole cover to the manhole support frame by screwing and tightening the manhole cover 4 and the nut portion 2 provided on the manhole support frame 1 with bolts, so that the fixation is robust. Even if a vehicle passes over the manhole cover, the manhole cover does not shake, and there is no danger of the manhole cover jumping up.

In addition, since a locking device is fitted over the bolt head in the through hole for the locking device to lock the bolt, the locking device cannot be easily removed by an unauthorized person, and therefore the bolt can be easily removed. It is safe because it is impossible to remove the manhole without removing it.

In addition, the locking device and bolts are covered with a cap that is flush with the top surface of the manhole, so they are not damaged, are protected from gas and rainwater, eliminate rust, and are not only durable but also simple in structure. Therefore, there are advantages such as easy replacement of parts.

[Brief explanation of drawings]

Fig. 1 is a plan view of the manhole cover of this invention, Fig. 2 is a plan view of the manhole with the manhole cover shown in Fig. 1 removed, and Fig. 3 is an enlarged vertical cross-sectional view taken along line X-X in Fig. 1. , Fig. 4 is a plan view of the cap, Fig. 5 is an enlarged vertical sectional view taken along the line X-X in Fig. 1 with the cap removed, and Fig. 6 is a plan view of the locking device with the cap removed. 7 is an enlarged vertical sectional view taken along the line XX in FIG. 1 with the locking device removed, and FIG. 8 is a plan view of the bolt head. 1... Manhole receiving frame, 2... Nut part, 4... Manhole cover, 5... Through hole for locking device, 6... Bolt, 7... Fitting hole, 8... Locking hole, 9... Locking hole,
10... Locking device, 11... Cylinder lock, 11 a... Cylinder, 11 b...
...Key insertion part, 12...Locking part, 13...
... Key, 14 ... Screw-in/screw-unscrew operation tool, 15
...Cap, 16゜17...Shaft rod,
18.19...Shaft rod insertion hole, 20...
Handle for removing the cap.

Claims (1)

[Scope of utility model registration request] fixing a nut part inside the manhole receiving frame and positioning its screw hole in the vertical direction, forming a through hole for a locking device located above the screw hole of the manhole cover and communicating between the front and back of the manhole cover; A bolt with a locking part for bolt operation on its head is inserted into the hole, so that its tip can be screwed into the screw hole of the nut part, and the bolt head can be detachably engaged with the bolt head. A locking device including a cylinder lock with a key insertion part on the top surface is fitted into the hole above the bolt head,
A locking device for a manhole cover, in which a cap is fitted into a hole above the locking device, and the upper surface of the cap and the upper surface of the manhole are placed on the road surface.