JP2587393B2 - Closure device for receiving hole for opening operation tool of manhole cover - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closing device which is mounted in a receiving hole for an opening operation tool of a manhole cover.

[0002]

2. Description of the Related Art In a conventional manhole cover, since the insertion hole of the opening operation tool provided on the upper surface is left open on the road surface, it is clogged with mud or sand after a certain period of time. Therefore, when opening the manhole cover, it is necessary to carry out pre-work to remove mud and dust.
This requires considerable time and effort.

[0003] Naturally, it has been proposed to fit a rubber cap or the like into the receiving hole. However, if the cap is simply fitted, contact or vibration with the wheels of the traveling vehicle or the pedestrian's shoe tip or the like may occur. As a result, it easily escapes from the receiving hole, and the original closing function cannot be maintained for a long time.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a device for closing a receiving hole for a manhole cover opening operation tool, which can accurately protect the clogging of mud and dust for a long period of time.

[0005]

The closing device according to the present invention will be described below with reference numerals in the accompanying drawings. The closing device includes a cap body 5, a lock shaft 9, and a stopper plate 15.
The cap body 5 is connected to the shaft cylinder 6 inserted into the insertion hole 3 of the opening operation tool 2 of the manhole cover 1, and is connected to the upper end of the shaft cylinder 6. An upper panel 8 is fitted into the upper recess 7 of the wall 4.

The lock shaft 9 is vertically movably fitted into the shaft cylinder 6 of the cap body 5 and is urged upward by a spring 10. At the upper end of the lock shaft 9, there is provided a passive portion 13 with which the drive portion 12 of the operation handle 11 is engaged.

The stopper plate 15 is fixed to the lower end of the lock shaft 9 protruding from the lower surface of the horizontal wall 4, and is connected to the receiving hole 3.
It is possible to enter and exit from. The upward arm 16 of the stopper plate 15 is engaged with and disengaged from the lower groove 14 which forms an angle with the receiving hole 3 of the horizontal wall 4.

[0008]

When the opening tool 2 of the manhole cover 1 is not used, as shown in FIGS. 1 and 2, the shaft tube portion 6 of the cap body 5 is fitted into the opening 3 for the opening tool and the receiving hole. The upper surface recess 8 around the periphery 3 is fitted with the upper surface panel 8 of the cap body 5, thereby completely closing the receiving hole 3.
Intrusion of mud and dust is properly prevented.

In the closed state, the upward arm 16 of the stopper plate 15 is engaged with the lower groove 14 of the horizontal wall 4, and the engagement is firmly held by the bias of the spring 10. In addition, the cap main body 5 does not unintentionally escape from the receiving hole 3 due to contact or vibration with wheels or the like of the traveling vehicle.

In order to remove the cap body 5 from the receiving hole 3, as shown in FIG.
Is engaged with the passive portion 13 of the lock shaft 9, and the operation handle 11 is pushed down as shown in FIGS. As a result, the upward arm 16 of the stopper plate 15 escapes from the lower surface groove 14 of the horizontal wall 4, so that the lock shaft 9 is rotatable.

As shown in FIG. 5 and FIG.
When the lock shaft 9 is rotated in the unlocking direction while the lock shaft 9 is rotated while the lock lever 9 is pressed down, the stopper plate 15 that rotates integrally with the lock shaft 9 comes to a position aligned below the receiving hole 3. When the depression of the operating handle 11 is released at that stage, the lock shaft 9
Since the upward movement is performed by the urging of 0, the upward arm 16 of the stopper plate 15 enters the receiving hole 3.

When the upper end of the lock shaft 9 protruding from the upper end opening of the shaft cylinder portion 6 of the cap body 5 is picked up and the cap body 5 is pulled out from the receiving hole 3, the receiving hole as shown in FIGS. 3 is fully open. Therefore, after the T-shaped tip 17 of the opening operation tool 2 is inserted into the receiving hole 3 and turned by a predetermined angle to engage the lower surface groove 14 of the horizontal wall 4, the manhole cover is pulled by pulling the opening operation tool 2. 1 is released.

[0013]

In the illustrated embodiment, the upper surface recess 7 of the horizontal wall 4 of the manhole cover 1 is formed in a circular shape, the receiving hole 3 is formed to be elongated in the shape of a slot on the diameter of the upper surface recess 7, and the central portion is formed. Both inner walls have arc-shaped enlarged portions. Shaft barrel 6 of cap body 5
Is connected to the center of the circular upper panel 8 and is fitted into the arc-shaped enlarged portion of the receiving hole 3. The stopper plate 15 is formed of a strip bent in a U-shape.

The lower surface groove 14 of the horizontal wall 4 in plan view
And the receiving hole 3 intersect at an angle of 90 degrees, and the rotation angle of the lock shaft 9 is 90 degrees. Spring 10 for urging lock shaft 9
Is constituted by a compression coil spring. The upper end of the spring 10 abuts on the upper end flange 18 of the lock shaft 9, and the lower end of the spring 10 abuts on the inner bottom wall 27 of the shaft cylinder 6.

The passive portion 13 of the lock shaft 9 is
3a and an eccentric depression 13b, and the driving portion 12 of the operating handle 11 is correspondingly constituted by a circular concave portion 12a and an eccentric projection 12b. Have.

The stopper plate 15 is non-rotatably fitted to a square shaft portion 20 of the lock shaft 9 through a square hole 19 at the center, and is fixed to the lock shaft 9 by a nut 22 fitted to a screw shaft portion 21 of the lock shaft 9. Tightened and fixed. The manhole cover 1 is supported by an inner wall flange 24 of the manhole body 23. A packing board 25 is provided on the back side of the upper face board 8 of the cap body 5. A stop step 26 with which the upper end flange 18 contacts is provided on the inner wall surface of the shaft cylinder 6.

[0017]

As described above, according to the closing device of the present invention, the shaft cylindrical portion 6 of the cap body 5 is inserted into the receiving hole 3 of the opening operation tool 2, and the horizontal wall around the receiving hole 3 is formed. 4 is fitted into the upper panel 8 of the cap body 5,
The receiving hole 3 can be protected from intrusion of mud and dust, and the work before removing the clogging of the receiving hole 3 when opening the manhole cover 1 is not required at all, and the workability is improved.

A lock plate 15 is fixed to the lower end of a lock shaft 9 which is vertically movably fitted into the shaft cylinder 6 of the cap body 5, and in the closed state, the lock plate 15 is fixed.
The upwardly directed arm 16 is accurately engaged with the lower groove 14 of the horizontal wall 4, so that the cap main body 5 cannot escape from the receiving hole 3 due to contact or vibration with wheels or the like of the traveling vehicle. Thus, the closed state can be stably maintained for a long period of time.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a closed state of a receiving hole of a manhole cover to which a closing device according to an embodiment of the present invention is applied.

FIG. 2 is a plan view showing a closed state of a receiving hole of the manhole cover.

FIG. 3 is a longitudinal sectional view showing a state where an operation handle of the closing device is pushed down.

FIG. 4 is a plan view showing a state where an operation handle of the closing device is pushed down.

FIG. 5 is a longitudinal sectional view showing a state in which an operation handle of the closing device is turned by 90 degrees.

FIG. 6 is a plan view showing a state in which the operation handle of the closing device is turned 90 degrees.

FIG. 7 is a longitudinal sectional view showing a state where the closing device is removed from a receiving hole of a manhole cover.

FIG. 8 is a plan view showing a state where the closing device is pulled out from a receiving hole of a manhole cover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manhole cover 2 Opening operation tool 3 Insertion hole of opening operation tool 4 Horizontal wall part of manhole cover 5 Cap body 6 Shaft cylinder part of cap body 7 Upper surface recess of horizontal wall part 8 Upper surface panel part of cap body 9 Lock shaft DESCRIPTION OF SYMBOLS 10 Energizing spring of lock shaft 11 Operating handle 12 Drive portion of operating handle 13 Passive portion of lock shaft 14 Lower surface groove of horizontal wall 15 Clasp plate 16 Upward arm portion of clasp plate 17 T-shaped tip of opening operation tool Part 18 Upper flange of lock shaft 19 Square hole of stopper plate 20 Square shaft of lock shaft 21 Screw shaft of lock shaft 22 Fixing nut 23 Manhole body 24 Inner wall flange of manhole body 25 Packing board 26 Shaft cylinder Stop step part 27 Inner bottom wall of shaft cylinder part

Claims (1)

(57) [Claims] 1. A shaft cylinder part (6) to be inserted into an insertion hole (3) of an opening operation tool (2) of a manhole cover (1). Upper surface recess 7 of wall 4
A cap body 5 composed of a top panel 8 fitted into the body;
A lock shaft 9 having a passive portion 13 which is vertically movably inserted into the shaft tube portion 6 and is urged upward by a spring 10 to engage with a drive portion 12 of an operation handle 11 at an upper end portion; The lower surface of the lock shaft 9 protruding from the lower surface of the wall portion 4 is fixed to the lower end of the lock shaft 9 and can enter and exit through the receiving hole 3. A closing device for a receiving hole for an opening operation portion of a manhole cover, comprising a catch plate 15 engaged with and disengaged from a groove portion 14.