JP2704388B2 - Locking device for lids such as common grooves - 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 at an entrance / exit portion such as a common groove for wiring, and more particularly to a locking device for a lid which rotates and locks a latch on a horizontal plane to perform locking and unlocking.

[0002]

2. Description of the Related Art Conventionally, in a common groove for wiring, the entrance and exit of the common groove are closed with a lid for the purpose of wiring protection and safety light, and the lid is further locked with a locking device on a fixed frame body of the entrance and exit. By doing so, the lid is prevented from being accidentally opened. In these locking devices, the device main body is embedded and fixed in a lid made of an iron frame, and a latch is provided which comes and goes from the device main body by rotating horizontally at a fixed position. It is disengaged from the fixed frame.

[0003] However, since the entrance and exit of the common groove are openly arranged, dust, earth and sand, etc., tend to accumulate at the engagement portion between the latch and the receiving metal, and the upper surface of the latch is rubbed against the lower surface of the receiving metal to mount the latch. In the conventional device of the horizontal rotation type, the frictional resistance due to contaminants such as earth and sand adhered between the latch and the receiving metal increases, the force required for the rotation operation of the latch is amplified, and in some cases the locking device operates normally. Sometimes it stopped working.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lock for a lid, such as a common groove, which can smoothly perform a locking and unlocking operation without being subjected to friction between a latch and a receiver or resistance due to a foreign object. It is to provide a device.

[0005]

A lock device for a lid such as a common groove according to the present invention will now be described with reference to the accompanying drawings. A cylindrical cam member 5 having a first cam groove 3 in the axial direction and a second cam groove 4 oblique to the axial direction on the side wall in a lower portion of the cylindrical member.
And a guide shaft 6 which protrudes from the side wall and slides into the first cam groove 3 and the second cam groove 4, and a latch shaft 8 provided with a latch 7 at the lower end is fitted into the cam member 5.

A male screw portion 10 screwed to the female screw portion 9 on the upper inner peripheral surface of the case 2 is provided on the outer peripheral surface of the head portion 14.
A concave portion 13 into which the tip convex portion 12 of the operation wrench 11 is fitted is provided on the upper surface of the shaft, and a male screw portion 16 screwed to the female screw portion 15 on the upper inner peripheral surface of the latch shaft 8 is provided on the outer peripheral surface of the shaft portion 17. The operating screw member 18 is fitted into the case 2 and the latch shaft 8 and urged by a spring 19 in a direction to separate the operating screw member 18 and the latch shaft 8 from each other. The pitch of the screw portion 10 is set to be larger than the pitch of the male screw portion 16 of the shaft portion 17.

To unlock the lid 1, the projection 12 of the operation wrench 11 is inserted into the recess 10 of the head 14 of the operation screw member 18.
And the operation wrench 11 is turned in a predetermined direction to screw the operation screw member 18 downward to move. By this screwing rotation, the operation screw member 18 moves downward by a distance obtained by multiplying the pitch of the male screw portion 10 of the head 14 by the number of rotations of the operation screw member 18. The guide pin 6 is the first of the cam members 5.
The latch shaft 8, which is prevented from rotating by sliding into the cam groove 3, moves downward by a distance obtained by multiplying the pitch of the male screw portion 16 of the shaft portion 17 by the number of rotations of the operation screw member 18.

At this time, since the pitch of the male screw portion 10 is set to be larger than the pitch of the male screw portion 16, the shaft portion 17 of the operating screw member 18 has the latch shaft 8 by the distance obtained by multiplying the pitch difference by the number of rotations. Will be screwed into. Latch shaft 8 which is vertically guided and guided by first cam groove 3 of cam member 5
When the guide pin 6 reaches the second cam groove 4 of the cam member 5, the guide pin 6 rotates integrally with the operation screw member 18 along the second cam groove 4, and as shown in FIG. When the latch 7 at the lower end is horizontally rotated and comes out of the receiving member 20, the locking of the lid 1 to the fixed frame is released.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, a fixing bolt 22 is screwed into a screw hole 21 provided at two places on each side wall of a cam member 5 and a case 2 from the outside of the case 2. The cam member 5 is fixed to the case 2. The guide pins 6 of the latch shaft 8 are fitted and fixed in through holes 23 provided in the latch shaft 8 in the diametrical direction. The push-up biasing spring 19 of the operation screw member 18 is configured by a compression coil spring. The latch 7 is screwed and fixed to a threaded rod 24 at the lower end of the latch shaft 8.

The shaft diameter of the head 14 of the operation screw member 18 is larger than the shaft diameter of the shaft 17, and the pitch of the male screw 10 of the head 14 is set to be twice the pitch of the male screw 16 of the shaft 17. Then, as shown in FIG. 2, the latch shaft 8 has been lowered by half the screwing distance of the operation screw member 18 by the stage immediately before the rotation of the latch shaft 8.

[0011]

As described above, in the locking device for a lid such as a common groove according to the present invention, the upper surface of the latch 7 descends so as to be vertically separated from the lower surface of the receiver 20 at the time of unlocking. There is no friction between the latches 20 and the latch 7 does not receive resistance due to foreign objects such as earth and sand that have adhered in the course of the horizontal rotation, so that the locking and unlocking operation can be performed smoothly and always function normally. it can.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a locking device for a lid according to an embodiment of the present invention at the time of locking.

FIG. 2 is a vertical sectional view showing a process of screwing an operation screw member of the locking device for a lid.

FIG. 3 is a vertical sectional view of the locking device for a lid when unlocked.

FIG. 4 is a perspective view of a cam member used in the lid locking device.

FIG. 5 is a perspective view of a latch shaft used in the lid locking device.

[Explanation of symbols]

 Reference Signs List 1 lid 2 case 3 first cam groove 4 second cam groove 5 cam member 6 guide pin 7 latch 8 latch shaft 9 female screw part 10 male screw part 11 operating wrench 12 tip convex part 13 concave part 14 head 15 female screw Part 16 Male screw part 17 Shaft part 18 Operation screw member 19 Spring 20 Latch receiving part 21 Screw hole 22 Fixing bolt 23 Through hole 24 Screw rod part

Claims (1)

(57) [Claims] 1. A first cam groove 3 extending in an axial direction and a second cam groove 4 having an oblique path with respect to the axial direction are continuously formed on a side wall of a lower portion of a case 2 of a vertical cylinder fixed to a lid 1. A latch shaft 8 having a cylindrical cam member 5 fixed thereto, a guide pin 6 slidingly fitted to the first cam groove 3 and the second cam groove 4 on the side wall, and a latch 7 provided at a lower end portion is provided. A male screw portion 10 which is inserted into the cam member 5 and is screwed to the female screw portion 9 on the upper inner peripheral surface of the case 2 is provided on the outer peripheral surface of the head 14. A concave portion 13 is provided in which the tip convex portion 12 is fitted, and a male screw portion 16 screwed to the female screw portion 15 on the upper inner peripheral surface of the latch shaft 8 is connected to the shaft portion 1.
The operation screw member 18 provided on the outer peripheral surface of the housing 7 is fitted into the case 2 and the latch shaft 8, and is urged by a spring 19 in a direction separating the operation screw member 18 and the latch shaft 8. The pitch of the male screw part 10 of the head 14
7. A locking device for a lid, such as a common groove, which is larger than the pitch of the male screw portion 16 of FIG.