JPH0730570B2 - Lock forgetting prevention device in lock device for lid - Google Patents

Description

The present invention relates to a lock forgetting device in a lid locking device.

<Prior Art> A lid, such as a manhole lid, is provided with a locking device in order to prevent the lid from being opened accidentally. As an example, an operating shaft is hung vertically on the cover plate, and an engaging claw that engages with a receiving frame on which the lid is mounted is provided at the lower end of the operating shaft.
It is locked by being disengaged from the engaging portion of the receiving frame.

<Problems to be Solved by the Invention> However, in the conventional locking device including the above-mentioned device, even if the operator forgets to perform locking due to the carelessness of the operator at the time of closing the lid, whether the locking state or the non-locking state occurs after the lid is closed. There is a problem that workers cannot notice even in a non-locked state, and the solution has been a problem.

<Means for Solving the Problem> The present invention is a lock forgetting prevention device developed to solve this problem, and is configured as follows.

That is, a lock case is provided on the upper side of the lid plate,
An operation hole with a cap is opened in the upper plate of this case, and a shaft bolt having a screw hole for rotation is provided at the upper end of the cover plate for raising and lowering and rotating through the cover plate, and the shaft is attached to the shaft bolt. A spring that urges downward is installed on the outside, a lock claw that engages with the receiving frame of the cover plate is attached to the lower end of the shaft bolt, and a rotation stopper that stops the rotation of the shaft bolt when engaging is provided on the upper part. Is a lock forgetting device in a locking device for a lid, wherein an upper end position of the cap is set to abut a lower end of the cap of the operation hole.

<Operation> If the lock claw is not engaged with the receiving frame, the upper end of the shaft bolt will hit the lower end of the cap of the operation hole, and the cap will not fit. For this reason, the operator immediately notices that the lock has not occurred.

<Example> The present invention will be described below with reference to the drawings by using a manhole cover as an example.

In the cover plate 3 fitted into the upper open end 2 of the manhole frame 1, a recess 4 for mounting the lock device A is provided on the upper side of the cover plate 3, and the case 5 for the lock device A is attached thereto. The case 5 is a bottomless box body as shown in FIG. 4, is provided with outwardly bent flanges 51, 51 at its lower end, and is fixed to the cover plate 3 by a bolt 52 penetrating therethrough.

An operation hole 7 with a cap 6 is formed in the upper plate 53 of the case 5, and a shaft bolt 8 which penetrates through the cover plate 3 and moves up and down is vertically provided below the operation hole 7. The cap 6 is screwed and fixed to the upper plate 53, a pair of holes 61, 61 for turning the cap 6 is provided on the upper surface, and a projecting portion 62 is provided at the lower end.

A nut 10 having an open upper end of a screw hole 9 is attached to the upper end of the shaft bolt 8, and engaging rods 11, 11 projecting to the left and right are provided at the lower part of the nut 10. At the lower end of the shaft bolt 8, the engaging rod is
A locking claw 12 extending in the same direction as the left engaging rod 11 (see FIG. 2) of 11 is attached. The locking claw 12 has a length such that the tip thereof reaches the engaging recess 13 of the manhole frame 1, and is set so that a space 14 is formed between the upper surface of the locking claw 12 and the upper surface of the recess 13. A spring 15 is mounted on the outer circumference of the shaft bolt 8 between the lock claw 12 and the cover plate 3 to urge the shaft bolt 8 downward.

As shown in FIG. 5, a pair of detents 16, 16 are provided in the concave portion 4 of the cover plate 3 at positions facing each other around the axial bolt 8. The rotation stopper 16 is a trapezoid in which one of the hypotenuses 161 has a gentle slope and has a recess 17 on the upper side.

Next, how to use this device will be described. The opening operation will be described first. At the time of closing the lid, as shown in FIG. 2, the locking claw 12 is engaged with the engaging recess 13 of the manhole frame 1 and is locked, so that the locking claw 12 is first removed. Therefore, the cap 6 of the operation hole 7 is rotated and removed. At this time, the holes 61, 61 serve as locking portions with the tool for rotation.

After the cap 6 is removed, the shaft bolt 8 including the nut 10 is lifted up by a tool (not shown) that is screwed into the screw hole 9 of the nut 10 and engages with the engaging rod 11 or the notch groove 101 of the nut 10. Turn it clockwise (arrow direction in Fig. 5). When turned 90 times in the clockwise direction, the engaging rods 11, 11 enter the recesses 17 of the detents 16, 16 as shown in FIG. 7, and are urged by the spring 15. The amount of lifting is the space of the engaging recess 13.
It is in the range of 14. With this, the engagement of the locking claw 12 with the manhole frame 1 is released, so that the cover plate 3 can be easily opened.

Next, the lid closing work, which is the reverse of the above lid opening work. First, when the engagement rod 11 and the recess 17 are engaged, the nut 10
While pushing down the shaft bolt 8 including, turn it counterclockwise. By turning, the engaging rods 11, 11 will not rotate
Since it comes off, it can be lowered. When turned 90 times counterclockwise, the locking claw 12 engages with the engaging recess 13 of the manhole frame 1, and the cover plate 3 is locked. At the same time, the spring 15 expands and urges the shaft bolt 8 downward, so that the shaft bolt 8 is stable and rotation is prevented by the detent 16.

When the lock is completed, screw the cap 6 into the operation hole 7. By locking, the nut 10 returns to its original position and is lowered, so that the cap 6 can be screwed into the operation hole 7 without being disturbed by the nut 10.

Since the nut 10 will not lower unless it is inadvertently locked, the cap 6 should not be disturbed by the nut 10, and the worker immediately notices that it is not locked.

<Effect of the Invention> Since the present invention is configured as described above, the cap does not fit into the operation hole unless it is locked when the lid is closed. For this reason, the worker immediately notices that the lock has not occurred, and therefore the risk of forgetting the lock due to the carelessness of the worker can be completely eliminated, and the effect is a great safety measure.

[Brief description of drawings]

FIG. 1 is a plan view showing a lock forgetting device of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 3, FIG. 3 is a sectional view taken along line BB of FIG.
The figure is a sectional view taken along the line CC, FIG. 5 is a plan view showing the shaft bolt, the engaging rod, and the detent, FIG. 6 is a front view showing the nut at the time of locking, and FIG. 7 is a nut at the time of non-locking. FIG. 8 is a schematic vertical sectional view showing the manhole frame and the lid, and FIG. 9 is a plan view of the same. 1 …… Manhole frame, 3 …… Lid body 5 …… Case, 6 …… Cap 7 …… Operating hole, 8 …… Axial bolt 9 …… Screw hole, 12 …… Lock claw 15 …… Spring 16 …… Rotating Stop A: Lock device

Claims (1)

[Claims] 1. A lock case is provided on the upper surface side of the lid plate, and an operation hole with a cap is opened in the upper plate of the case.
A shaft bolt that penetrates through the cover plate and moves up and down and has a screw hole for rotation at the upper end is provided under the cover, and a spring for urging the shaft downward is installed on the shaft bolt. Attach the lock claw that engages with the receiving frame of the lid plate at the lower end,
A lock device for a lid, characterized in that a detent for stopping rotation of the shaft bolt when engaged is provided and an upper end position when the shaft bolt is disengaged is set to abut against a lower end of the cap of the operation hole. Lock forgetting device in.