JPS5851247Y2 - Manhole cover locking device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a locking device for a manhole cover, and includes a horizontal noddle rod that can be removed from a manhole by inserting a hanging hook into a groove provided on the top surface and hooking it. In the manhole cover which is made of a manhole cover, a locking mechanism provided inside the casing which is slid into the groove in a substantially tight fit and can be freely removed is inserted through the key insertion hole in the top wall of the casing. The key can be rotated in two directions, the locking direction and the unlocking direction, and as the locking mechanism rotates in the locking direction, the hook of the mechanism is hooked to the bundle rod to irremovably lock the casing. In addition to making it impossible to insert hanging hooks into the groove, when necessary, the lock can be unlocked with a key, the housing can be removed from the groove, and the manhole cover can be removed from the manhole using the hanging hooks. The purpose of this is to prevent the manhole cover from being removed by lifting the bundle rod, and to prevent the casing from protruding significantly above the top of the manhole cover when it is locked, thereby impeding traffic. To provide a locking device with

Conventionally, in order to prevent the manhole cover from being removed unnecessarily, a locking method using a palliative method such as hanging a chain between the manhole frame and the appropriate position of the manhole cover and locking the chain with a padlock, etc. Manholes in sewers, underground tanks, etc., where there is a risk of foul odors or toxic gases being released, were not allowed to be opened without permission.

The present invention can improve such conventional methods.

The attached drawings show an embodiment of the present invention, in which 1 is a manhole cover placed over a frame fixed to a manhole opening a,
The surface is provided with grooves 2, 2 into which horizontal bundle rods 3 are passed, respectively.

Reference numeral 4 denotes a cup-shaped casing that fits almost tightly into the groove 2, and has a key insertion hole 7 formed in the center of the upper wall 5, and an engagement flange for a locking plate 11 (described later) above the outer peripheral wall 6. Several guide pins 8 for locking the bundle rod 13 are arranged in an annular arrangement and protrude from the inner surface, and a pair of straddling grooves 9, 9 for straddling the bundle rod 3 are cut into the lower end edge.

Two locking grooves 10a and 10b are provided on the inner periphery of the outer peripheral wall 6, corresponding to two positions: an unlocking angle and a locking angle.

Reference numeral 11 denotes a locking plate rotatably disposed below the upper wall 5 of the housing 4, and an engagement collar 13 supported by a guide pin 8 is provided at the upper end of the short cylindrical portion 12 on the outer periphery. The lock plate 1
A recess 14 formed by a short cylindrical portion 12 on the top surface of 1
An engaging hole 15 into which the lower end of the key is inserted is formed in the center of the iron plate 11, and a pin-shaped engaging member 16 protruding into the recess 14 is provided on the upper surface.

Further, a pair of leg pieces 17, 17 extending downward from the circumferential surface of the locking plate 11, passing through both sides of the bundle rod 3, protrudes downward, and hooks 18, 18 protrude from the lower end of each of the leg pieces 17, 17 in the locking rotation direction against the lower surface of the bundle rod 3. will be established.

The hook 18° 18 passes freely along both sides of the bundle rod 3 together with the leg pieces 17 and 17 at the unlocking angle of the locking plate 11, which will be described in detail later, and when the locking plate 11 is at the locking angle, the bundle rod 3
Displaced to the lower surface of.

One end of a locking piece 19 made of a spring plate, which fits into the locking groove 10a at the unlocking angle of the locking plate 11 and into the locking groove 10b at the locking angle, is fixed to one of the leg pieces 17. do.

The locking piece may be a locking ball that is ejected by a spring.

The key 20 inserted into the key insertion hole 7 has a large diameter operation rod 21 whose lower end is inserted into the engagement hole 15 through the center, rotates over the locking plate 11 and moves to the right with respect to the retainer 16. Single-shaped rod 2 that comes into contact from the (locking direction) or the left direction (unlocking direction)
2 are provided protruding from both sides.

In this embodiment, the casing 4 is fitted into the concave groove 2 of the manhole cover 1 in a depressed manner, and the straddling groove 9 is made to straddle the bundle rod 3 from above, thereby restraining the free rotation of the casing 4. In addition, the leg piece 17 of the lock plate 11 and the hook 18 are passed through both sides of the bundle rod 3.

At this time, the locking piece 19 engages with the locking groove 10a and the locking plate 1
1 is held at the unlocking angle so as not to rotate freely, so the locking element 16 is in the position shown by the chain line in FIG.

Therefore, insert the key 20 through the key insertion hole 7, and press the operating rod 21.
Insert the tip of the key into the engaging hole 15 at the center of the locking plate 11, and at the same time apply the straight-shaped rod 22 to the top surface of the locking plate 11, and then rotate the key 20 to the right in FIG. 4 until it is at the chain line position. is rotated in the locking direction so as to move the retainer 16 to the solid line position.

By doing this, the locking piece 19 will fit into the locking groove 10b as shown in FIG.
The hook 18 of the other leg piece 17 moves to the lower surface □ of the bundle rod 3 as shown in FIG. Lock it so that it cannot be removed.

The key 20 is individually rotated back to the left and removed from the key insertion hole 7.

To unlock the housing 4, insert the key 20 into the key insertion hole 7.
is rotated to the left and the engaging member 16 is pushed by the straight-shaped rod 22, and the locking plate 11 is set to the unlocking angle, and the locking piece 19 is moved into the locking groove 1.
At the same time, the hook 18 is displaced to the left from the lower surface of the bundle rod 3.

This allows the casing 4 to be removed freely, and is removed from the groove 2 using the key 20.

The present invention has the configuration as exemplified above, in which the bundle rod 3 passed horizontally into the concave groove 2 of the manhole cover 1 is dropped into the concave groove 2 to form an almost tight fit, and the straddle groove 9 The locking plate 11, which is rotatably supported by the housing 4 which is made unrotatable by fitting into the bundle rod 3, is rotated to a locking angle with the key 20 to lock and lock the bundle rod 3, Or, when the housing 4 is rotated to the unlocking angle and removed, the housing 4 is rotated to the locking angle.
Since it becomes impossible to remove the bundle rod 3 and hides the bundle rod 3, it becomes impossible to lift the manhole cover by the bundle rod 3, and furthermore, it causes the casing 4 to protrude significantly above the manhole cover 1. Therefore, the locking object does not get in the way, and it has the advantage that it can be freely applied to a ready-made manhole cover provided with the groove 2 and the bundle rod 3.

[Brief explanation of drawings]

The accompanying drawings show one embodiment of the present invention, in which Fig. 1 is a schematic plan view of a manhole cover, Fig. 2 is a side view cut away from the center, Fig. 3 is a side view cut away along line A-A in Fig. 4, and Fig. 4 is a side view cut away from the center. 5 is a partially cutaway plan view, FIG. 5 is a plan view taken along line BB in FIG. 3, FIG. 6 is a perspective view of the casing, and FIG. 7 is a perspective view of the locking plate. 1 → Manhole cover, 2 → Concave groove, 3 → Bundle rod, 4 → Housing, 5 → Top wall, 6 → Outer wall, 7 → Key insertion hole, 11 →
Lock plate, 16 → engaging element, 17 → leg piece, 18 → hook.

Claims (1)

[Scope of utility model registration request] A manhole cover 1 has a groove 2 on its upper surface and a horizontal nozzle rod 3 inserted into the groove, and the manhole cover 1 falls into the groove 2 in a substantially tight fit and can be freely removed from the outer circumferential wall 6. A key insertion hole 7 is provided in the upper wall 5 of the housing 4 in which the straddle groove 9 cut from the lower surface is fitted into the bundle rod 3, and the key is inserted through the key insertion hole 7 into the lower surface of the upper wall 5. A locking plate 11 is provided which is rotated in the locking direction and the unlocking direction by abutting the key 20 against the engaging element 16, and the locking plate 11 has a leg piece that passes through the side of the bundle rod 3 at the unlocking angle. 17 and a hook 18 projecting in the locking direction from the lower side corresponding to the lower surface of the bundle rod of the leg piece, so that the hook 18 is displaced to the lower surface of the bundle rod 3 as the locking plate 11 rotates in the locking direction. A manhole cover locking device featuring: