JPH044043Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a locking device for an iron manhole cover.

[Prior art and its problems]

Conventionally, there is a locking device shown in FIG. 4 that is attached to an iron manhole cover for the purpose of preventing theft of the iron manhole cover. That is, this locking device consists of a bolt 2 inserted vertically into the end of the iron lid 1.
It consists of a locking metal fitting 3 horizontally fixed to the lower end of the bolt 2, and a protrusion 5 protruding from the inner surface of the frame 4.

According to the locking device described above, the iron lid 1 can be locked to the frame 4 by turning the bolt 2 inserted into the iron lid 1 and locking the locking fitting 3 to the protrusion 5. The iron lid 1 can be opened by turning the locking metal fitting 3 and removing it from the protrusion 5.

However, in the conventional locking device described above, the locking metal fitting 3 easily comes off from the protrusion 5 due to vibrations of a car, etc., and furthermore, the iron cover 1 can be easily opened by simply turning the bolt 2. There was a problem.

[Purpose of invention]

The purpose of this invention was to create a locking device for the iron cover of a manhole, which would not be unlocked by the vibrations of vehicles, etc., and which would only be opened by a specific person. It is about providing.

[Summary of the idea]

This invention is a locking device for locking an iron manhole cover and a frame into which the iron cover is fitted, and includes a lid that is provided on the lower surface of the iron cover and can be opened and closed from the outside of the iron cover. A lock box, a lock fixed in the lock box, a horizontally movable rod fixed to a lock fitting of the lock, and a protruding piece at one end rotatably attached to the lower surface of an end of the iron lid. a horizontal cam having an engagement hole in the center of rotation; a keyhole formed in the iron lid at a position opposite to the engagement hole of the horizontal cam; an end of the horizontal moving rod and the horizontal cam; It is characterized in that it consists of a connecting rod for connecting the other end, and a flange provided inside the frame, with which the projecting piece of the horizontal cam engages.

[Structure of the idea]

Next, one embodiment of the locking device of this invention will be described with reference to the drawings.

FIG. 1 is a partial horizontal sectional view showing an embodiment of the lock device of this invention, FIG. 2 is a partial vertical sectional view showing the same embodiment, and FIG. 3 is a partially omitted plan view showing the same embodiment. It is a diagram.

In FIGS. 1 to 3, the iron lid 6 is fitted into a frame 7 buried in the ground. The lock box 8 has an iron lid 6
It is located at the center of the bottom surface of the . The iron box 8 has a lid 9 that is screwed onto the iron box 8. On the top surface of the lid 9,
A hole 9A is provided into which the tip of a jig (not shown) for rotating the lid 9 is inserted. The lock 10 is of a type in which the lock fitting 10A is inserted and removed from the lock body by matching the numbers, but it may also be of a normal key type.

The center part of the horizontal moving rod 11 is the lock fitting 1 of the lock 10.
It is fixed at 0A. Both ends of the horizontally moving rod 11 extend from the lock box 8 toward the end of the iron lid 6.
A pair of horizontal cams 12 are rotatably attached to the lower surface of the end of the iron lid 6 via a support fitting 13. The horizontal cam 12 has a protruding piece 12A at one end,
The center of rotation has an engagement hole 12B having a shape that matches the tip of a hand key (not shown). The projecting piece 12A engages with the lower surface of a flange 7A provided inside the frame 7, and a key portion of a hand key is inserted into the engagement hole 12B. Note that the engagement hole 12B has a pair of horizontal cams 12.
provided on either side.

A keyhole 14 having the same planar shape as the engagement hole 12B is formed in the iron lid 6 at a position facing the engagement hole 12B of one horizontal cam 12. The end of the horizontal moving rod 11 and the other end of the horizontal cam 12 are connected by a connecting rod.

According to the above-mentioned lock device of this invention, the tip of the rotary jig is inserted into the hole 9A of the lid 9 of the lock box 8 to open the lid 9, and then the lock 10 inside the lock box 8 is unlocked. By inserting the tip of the hand key into the engagement hole 12B of one of the horizontal cams 12 through the key hole 14 of the iron lid 9 and turning the hand key, the projecting pieces 12A of the pair of horizontal cams 12 are inserted. At the same time, the engagement of the flanges of the frame 7 is released. Thus, the iron lid 6 can be opened.

On the other hand, when the horizontal cam 12 is rotated in the opposite direction with the hand key, the projections 12A of the pair of horizontal cams 12
are respectively engaged with the lower surfaces of the flanges 7A of the frame 7, and at the same time the lock fitting 10A of the lock 10 is inserted into the lock body. After that, when the lock 10 is engaged, the horizontal moving rod 11 is fixed, so the horizontal cam 12 does not rotate. As a result, the iron lid 6 is locked to the frame 7.

[Effect of idea]

As explained above, according to this invention, the lock of the iron cover will not be released by vibrations of cars etc., and furthermore, only a specific person can open the iron cover, etc., which is useful. effect is brought about.

[Brief explanation of drawings]

FIG. 1 is a partial horizontal sectional view showing an embodiment of the lock device of this invention, FIG. 2 is a partial vertical sectional view showing the same embodiment, and FIG. 3 is a partially omitted plan view showing the same embodiment. FIG. 4 is a partial sectional view of a conventional locking device. In the drawing, 1... iron lid, 2... bolt, 3
...Lock fitting, 4...Frame, 5...Protrusion, 6...Iron lid, 7...Frame, 7A...Flange, 8 Lock box, 9...
...Lid, 9A...hole, 10...lock, 10A...lock fitting, 11...horizontal moving rod, 12...horizontal cam, 1
2A... Projection piece, 12B... Engagement hole, 13... Support metal fitting, 14... Keyhole, 15... Connection rod.

Claims (1)

[Scope of utility model registration request] a lock box for locking an iron manhole cover and a frame into which the iron cover is fitted, the lock box having a lid that is provided on the lower surface of the iron cover and can be opened and closed from the outside of the iron cover; A lock fixed in the lock box, a horizontally movable rod fixed to the lock fitting of the lock, a protruding piece at one end rotatably attached to the lower surface of the end of the iron cover, and a rotation center. a horizontal cam having an engagement hole at a portion thereof; a keyhole formed in the iron lid at a position opposite to the engagement hole of the horizontal cam; an end of the horizontal moving rod and the other end of the horizontal cam; 1. A locking device for an iron manhole cover, comprising a connecting rod for connecting the two, and a flange provided inside the frame and engaged with a protrusion of the horizontal cam.