JP3291269B2 - Locking device for lids at entrances and exits of common ditch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking device for a lid, which is provided at a doorway of a common groove for accommodating a communication cable, a power transmission cable, and a water and sewer pipe.

[0002]

2. Description of the Related Art In a conventional locking device used for a lid of a common groove entrance, since a keyhole of a lock unit is exposed on a road, there is a possibility that foreign matter such as mud is clogged and does not rotate. .

Further, since it is not easy to distinguish between the locked state and the unlocked state, there is a possibility that the user may forget to lock the door after closing the lid, and a person other than the authorized person may enter the common groove.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to prevent the lock from being unlocked due to the invasion of foreign matter,
Further, it is an object of the present invention to provide a locking device for a lid such as a common groove entrance which allows an unlocked state to be checked at a glance and for which an unlocking operation is easy.

[0005]

Means for Solving the Problems Hereinafter, a description will be given using reference numerals in the accompanying drawings.
Fixing base 5 to be attached to lid 1 such as a common groove entrance
A male screw portion 7 is provided at the upper end of the outer cylinder 4 fixed to the fixed base 5 so as to be vertically movable and rotatable, and protrudes and retracts from the upper surface opening of the outer cylinder 4 ; An inner cylinder 6 provided with an L-shaped cam groove portion 9 at its lower end and a shaft portion 10 at the lower end; a cam groove portion fixed to the outer cylinder 4 and fitted into the cam groove portion 9 when the inner cylinder 6 rotates. A guide pin 18 for moving the inner cylinder 6 up and down in cooperation with 9; a latch 11 fixed to the shaft portion 10 and engaging with the receiving portion 3 on the side of the fixed wall 2 at the entrance; cap tube 17 to conceal the keyhole 8 of the upper surface portion and; a key portion 14 which is inserted into the keyhole 8, a magnet 16 for adsorbing the cap cylinder 17, the upper opening of the outer tube 4
The nut portion 15 fitted to the male screw portion 7 protruding from the T-shaped operation handle 13 provided at each of the distal ends of the three branch rod portions 13a, 13b, 13c .
The cam groove 9 has a horizontal portion 9a and an end of the horizontal portion 9a.
A refraction intersection 9b communicating with the end,
A vertical portion communicating with the end portion and located below the horizontal portion 9a.
And the guide pin 18
Apparently, the horizontal portion 9a is moved to start the refraction intersection 9b.
In the first step before entering the end, the latch 11
The guide pin 18 is rotated to
Move the refraction intersection 9b and start the vertical portion 9c
In the next process of entering the part, the latch 11 is integrated with the inner cylinder 6
And upward movement, the male screw portion 7 of the inner tube 6 of the outer cylinder 4 on surface opening
It is set so as to partially protrude from.

In order to unlock the thus constructed locking device for a lid, as shown in FIG. 5A, a cap cylinder 17 is operated by a magnet portion 16 of an operating handle 13 before the unlocking operation. From the upper end of the inner cylinder 6. Next, the key portion 14 of the operation handle 13 is inserted into the keyhole 8 of the inner cylinder 6, and the inner cylinder 6 is turned integrally with the operation handle 13 in a predetermined direction by a required angle. In the first process from when the guide pin 18 apparently hits the horizontal portion 9a of the cam groove 9 to the refraction intersection 9b, the latch 11 rotates in the horizontal direction and separates from the receiving portion 3 on the fixed wall 2 side. In the next process in which the guide pin 18 apparently enters the vertical portion 9c from the refraction intersection 9b, the latch 11 moves upward integrally with the inner cylinder 6 as shown in FIG.

The upward movement causes the male screw portion 7 of the inner cylinder 6 to move.
Partially protrudes from the upper surface opening of the outer cylinder 4, the nut portion 15 of the operation handle 13 is fitted into the male screw portion 7, and the operation handle 13 is turned. Thereby, the inner cylinder 6 is raised until the latch 11 comes into contact with the lower end of the outer cylinder 4, and the entire length of the male screw portion 7 is drawn out to the upper surface of the outer cylinder 4. When the lid 1 is relatively lightweight, the lid 1 is opened by using the operation handle 13 as a lifting means as it is.
When the weight of the lid 1 is heavy, remove the nut portion 15 of the operation handle 13 from the external thread portion 7 of the inner cylinder 6 and remove the eye nut 2
0 is fitted into the male screw portion 7, the lifting means of the lifting heavy machine is connected to the eye nut 20, and the lid 1 is opened by mechanical force.

[0008]

In the illustrated embodiment, the cam groove 9 is formed such that a portion from the end of the upper horizontal portion 9a to the refraction intersection 9b is helically inclined, and the refraction intersection 9b is formed.
A vertical portion 9c is formed straight in the axial direction from the end portion of. An O-ring 12 for waterproofing is fitted in an outer peripheral groove 21 in a lower portion of the male screw portion 7. The annular step portion 19 provided on the inner surface of the intermediate portion of the outer cylinder 4 supports a downward load when the lid 1 is locked. The outer cylinder 4 is fixed to the fixed base 5 by being fitted into the through hole 5b of the fixed base 5 and then welding the entire periphery. The fixing base 5 is fixed to the lid 1 by passing a fixing tool such as a bolt through the through hole 5a. The latch 11 is fixed to the inner cylinder 6 by fitting the shaft portion 10 to the through hole 11a and then performing spot welding at several places.

The guide pin 18 is inserted into the through-hole 4a of the outer cylinder 4 so that the tip end engages with the cam groove 9, and is fixed to the outer cylinder 4 by welding after performing an operation test. In the present embodiment, when the operating handle 13 rotates the nato from the locked position to 45 degrees, the guide pin 18 hits the start end of the refracting intersection 9b of the cam groove 9. At this time, the latch 11 is rotated 45 degrees in parallel on the horizontal plane, and comes off the receiving portion 3. When further rotated by 45 degrees, the guide pin 18 comes into contact with the end of the refraction intersection 9b, and the inner cylinder 6 moves upward by about 7 mm. Thereafter, when the nut portion 15 of the operation handle 13 is fitted into the male screw portion 7 and turned, the guide pin 18 reaches the lower end of the vertical portion 9c of the cam groove portion 9, and the inner cylinder 6 further rises by about 5 mm. Thereby, the fitting length between the nut portion 15 or the eye nut 20 and the male screw portion 7 is about 12 mm.
Becomes

In this locking device for a lid, the keyhole 8 of the male screw portion 7 of the inner cylinder 6 is always concealed by the cap cylinder 17, so that the keyhole 8 is not clogged by foreign matter such as mud. Since the cap cylinder 17 is attracted by the magnet portion 16 of the operation handle 13 and is easily removed from the upper end of the inner cylinder 6, there is no time and effort required to prepare for unlocking the lid 1. Further, since the removed cap cylinder 17 is suction-held by the magnet portion 16, the loss accident of the cap cylinder 17 is avoided.

After the cap cylinder 17 is removed, the key 16 of the operation handle 13 is inserted into the key hole 8 of the inner cylinder 6 and the inner cylinder 6 is rotated in a predetermined direction by a required angle. The inner cylinder 6 rises while rotating by the action, and the latch 11 of the shaft portion 10 of the inner cylinder 6 is detached from the receiving portion 3 on the fixed wall 2 side.
It can be easily performed only by rotating operation.

[0012]

In the locking device for a lid according to the present invention configured as described above, the latch 11 rotates horizontally to receive the lock on the fixed wall 2 side.
After detaching from the part 3, the latch 11 is moved upward integrally with the inner cylinder 6.
In the moved state, since the male screw portion 7 of the inner cylinder 6 partially protrudes from the upper surface opening of the outer cylinder 4, the nut portion 15 of the operation handle 13 is fitted into the male screw portion 7 and turned, so that the inner cylinder 6 is moved. It can be pulled out from the outer cylinder 4 long enough
You. Therefore, when used directly as a hanging bracket the operating handle 13, or in any case separately mounting the eye nut 20 and remove the operating handle 13, the male screw portion 7 and the nut section 15 or eye nut 20
Is properly performed while securing a necessary and sufficient fitting length, and there is no drop accident of the lid 1 due to the nut portion 15 or the eye nut 20 coming off during the lifting operation of the lid 1.

Further, in the unlocked state, the male screw 7
Is projected from the opening on the upper surface of the outer cylinder 4, the unlocked state can be checked at a glance, and forgetting to lock the lid 1 can be easily prevented from being inspected.

[Brief description of the drawings]

FIG. 1 is a main part front view of a state in which a lid locking device according to an embodiment of the present invention is attached to a lid at an entrance such as a common groove.

FIG. 2 is a longitudinal sectional view of the lid locking device.

FIG. 3 is a plan view of the locking device for a lid in a locked state.

FIG. 4 is a front view of an operation handle of the locking device for a lid.

FIG. 5 is an explanatory view showing an operation process of the lid locking device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lid 2 Fixed wall 3 Receiving part 4 Outer cylinder 5 Fixed base 6 Inner cylinder 7 Male screw part 8 Key hole 9 Cam groove part 10 Shaft part 11 Hook 12 O-ring 13 Operation handle 14 Key part 15 Nut part 16 Magnet part 17 Cap Tube 18 Guide pin 19 Annular step 20 Eye nut

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) E02D 29/14 E05B 3/00 E05B 17/18 E05B 65/00

Claims (1)

(57) [Claims] 1. A joint groove entrance like lid 1 to the mounting is fixed Baie - scan 5 and; fixed base - the outer tube 4 which is fixed to the scan 5 is inserted vertically movable and rotatable, the upper surface of the outer cylinder 4 From the opening
Provided a male screw portion 7 infested to the upper end, an L-shaped cam groove 9 provided in the middle portion, an inner cylinder 6 having a shaft portion 10 at a lower end portion; fixed to the outer cylinder 4 in the cam groove 9 When the inner cylinder 6 is fitted and rotates, the inner cylinder 6
A guide pin 18 which moves up and down; a latch 11 which is fixed to the shaft portion 10 and engages with the receiving portion 3 on the side of the fixed wall 2 at the entrance; and a cap which is fitted to the male screw portion 7 and conceals the keyhole 8 on the upper surface portion. Cylinder 17; key portion 14 inserted into keyhole 8
And a magnet part 16 for attracting the cap cylinder 17 and an outer part.
The nut part 15 fitted to the male screw part 7 protruding from the upper surface opening of the cylinder 4 is divided into three branch rod parts 13a, 13b, 13
c, the cam groove 9 of the inner cylinder 6 has a horizontal portion 9a and a horizontal portion 9a.
A refraction intersection 9b communicating with the terminal end of the
Communicates with the end of the portion 9b and is positioned below the horizontal portion 9a.
And a vertical section 9c.
18 moves in the horizontal part 9a apparently,
In the first step before entering the starting end of 9b, the latch 11
Rotate in the horizontal direction to separate from the receiving part 3
18 apparently moves along the refraction intersection 9b to
In the next process of entering the starting end of the inner cylinder 6
And the male screw portion 7 of the inner cylinder 6
A locking device for a lid such as a common groove entrance that is set to partially protrude from the upper surface opening .