JPH0757961B2 - Locking device for surface lid for underground pipeline - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a locking device for a surface lid that opens and closes a service hole provided in the middle of an underground conduit such as a sewer or an underground cableway.

(Prior Art) As a conventional technology, there is one described in Japanese Utility Model Laid-Open No. 63-45857.

That is, as shown in FIG. 8, the engaging teeth 3 are formed so as to project inward on the inner periphery of the seat frame 2 that receives the surface lid 1.

On the back surface of the surface lid 1, a claw piece 4 and a regulating piece 8 are provided with engaging teeth 3
With respect to the lower right surface 4a of the pawl piece 4, the lower end left portion 8a of the restriction piece 8 is brought into contact with the lower right surface 4a of the pawl piece 4.

The claw piece 4 has a claw 5 which is engageable with and disengageable from the engaging tooth 3 formed on the lower left surface of the claw piece 4 and a bifurcated support piece 6 formed on the upper side thereof. It is rotatably suspended and supported by an intermediate member 10 fixed to the.

Further, the regulation piece 8 has an opening lid arm 9 extending leftward at the upper part thereof, and a left-right direction intermediate portion of the opening lid arm 9 is rotatably suspended and supported by an intermediate member 10. 9
The left part of the claw piece 4 passes through the space 7 between the support pieces 6 of the claw piece 4.

At the left end of the lid opening arm 9 is a pressing portion 9a protruding downward.
And a plug piece 9b projecting upward, the pressing portion 9a is brought into contact with an abutment surface 4b formed on the upper outer surface between the support pieces 6, and the plug piece 9b is an outer peripheral end portion of the surface lid 1 ( Piece hole formed through at the left end)
Removably fit into 1a.

As a result, in the normal state, the claw piece 4 and the regulation piece 8
8 rotates to the left in FIG. 8 due to its own weight, the claw 5 engages with the engaging tooth 3, and the plug piece 9b fits into the hook hole 1a to close it.

Further, when the ground cover 1 is opened, the operating rod 11 whose tip is bent in an L shape is pushed in from the hook hole 1a to move the stopper piece 9b downward as shown in FIG. 8 is rotated to the right, and the pressing portion 9a presses the contact surface 4b of the claw piece 4 to rotate the claw piece 4 to the right to disengage the claw 5 from the engaging tooth 3.

Next, the operation rod 11 is rotated leftward about the lower end thereof to open the ground cover 1.

(Problems to be solved by the invention) In the above-mentioned conventional one, when the operating rod 11 is pushed in from the hook hole 1a,
Since the claw piece 4 is rotated rightward through the regulation piece 8 and the claw 5 is disengaged from the engaging tooth 3, the ground cover 1 is inadvertently opened by a third party other than the related person. There was a fear.

Also, a spark will be generated when the operating rod 11 is pushed in forcefully from the hook hole 1a, but in this case, if the underground pipe is full of gas, this gas burns, that is, explodes. There was a defect that the surface lid 1 flew and was dangerous.

An object of the present invention is to obtain a novel locking device for a surface lid for an underground conduit, which solves the above-mentioned drawbacks.

(Means for Solving the Problems) The present invention is configured as follows in order to achieve the above object.

That is, the ground cover is openably and closably fitted to the seat frame provided at the opening edge of the underground conduit, and the engaging teeth protruding inward are provided on the inner peripheral portion of the seat frame to engage with the back surface of the ground cover. A claw piece and a regulation piece that sequentially move inward with respect to the teeth are suspended and supported in a swingable manner, the regulation piece is brought into contact with the inner rear surface of the claw piece, and the claw piece is engaged with the lower outer surface portion by engaging teeth The ground cover is provided with a claw that can be engaged with and disengaged from, a cavity having an open top surface, and operating pieces that are orthogonal to the swing axis of the claw piece and project outwards on both upper sides of the cavity. Further, a hook hole facing the cavity of the claw piece is formed therethrough, and a plug piece that is loosely fitted in the cavity of the claw piece and is removably fitted in the hook hole is provided on the upper portion of the restriction piece.

Further, a locking mechanism is provided between the claw piece and the restriction piece so as to engage with each other when both swing in the anti-engaging tooth direction by a predetermined angle.

(Operation) Since the present invention is configured as described above, in normal times, the claw piece and the restriction piece hang down under its own weight, the claw is moved outwardly to engage the engaging tooth, and the plug piece is It moves up and fits into the hook hole to close it.

Further, when opening the surface lid, if the operating rod having a T-shaped tip is pushed through the hook hole, the plug piece is moved downward and the hook hole is opened. The lower part of the claw fits into the gap of the claw piece and the claw piece is not opened.

Next, when the operating rod is rotated about 90 ° about its axis, both ends of the T-shaped portion of the operating rod straddle the claw pieces over the upper surface of the operating piece, and when the operating rod is moved downward in this state, The actuating piece is pressed downward, the pawl piece is rotated inward (withdrawal direction), and the pawl is disengaged from the engaging tooth. In this case, since the central portion of the lower end of the T-shaped portion is in contact with the plug piece, the regulating piece is also rotated inward (withdrawal method) at the same time.

Further, when the amount of rotation of the claw piece and the restriction piece in the retracting direction reaches a predetermined value, the locking mechanism provided between the two operates to lock, and both are held at the predetermined retracted position.

(Examples) Examples of the present invention will be described below with reference to the drawings.

In the drawings, FIG. 1 is a cross-sectional view of an essential part showing an operating state of a locking device, FIG. 2 is a cross-sectional view of an essential part showing a state in the middle of releasing the lock, and FIG. 4 and 5 are a front view and a side view of the claw piece, and FIGS. 6 and 7 are a front view and a side view of the regulation piece.

In FIG. 1, reference numeral 15 is a seat frame attached to the opening edge of the underground pipeline, and the seat frame 15 is formed in a cylindrical shape or a rectangular tube shape.

A disk-shaped or rectangular plate-shaped surface lid 17 is provided on the inner circumference of the seat frame 15.
Fit so that it can be opened and closed. The right end of the surface lid 17 is rotatably connected to the seat frame 15 by a pin (not shown).

Engaging teeth 16 projecting inward and downward are integrally formed on the inner peripheral portion of the left portion of the seat frame.

A claw piece 19 and a restriction piece 25 are suspended and supported on the left side of the back surface of the surface lid 17 so as to be swingable in the left-right direction.

As shown in FIGS. 1, 4, and 5, the pawl piece 19 is a hook-shaped pawl that protrudes in the direction of the engaging teeth 16 on the lower outer surface portion.
Forming 20 and width direction at the top (left and right direction in Fig. 4)
A pair of suspension arms 21 and 21 that are separated from each other and project upwards are formed, and a void portion whose upper surface is opened by each of these suspension arms 21 and 21.
Form 22.

Further, as shown in FIG. 4, shafts 23, 23 projecting outward in the width direction and an operating piece projecting in the direction of the seat frame 15 (left side in FIG. 5) are provided above the suspension arms 21, 21. 24 and 24 are integrally formed, and the shafts 23 and 23 are swingably suspended and supported on the back surface (reference numeral omitted) of the surface lid 17.

In addition, the above-mentioned restriction piece 25 is provided in FIG. 1, FIG. 6 and FIG.
As shown in the figure, an engaging projection 26 protruding toward the claw piece 19 is formed on the lower outer surface portion, and an elongated suspension arm 27 extending upward and leftward from the center portion in the width direction is formed. 6
As shown in the figure, shafts 28, 28 protruding outward in the width direction and a plug piece 29 protruding in the direction of the seat frame 15 (leftward in FIG. 7) are integrally formed.

The plug piece 29 is formed to have a width such that it can be loosely fitted in the void portion 22 of the pawl piece 19 described above.

Then, as shown in FIG.
Is placed on the right side of the shaft 28, and the shaft 28 is supported on the back surface of the surface lid 17 by a bracket (not shown) so that the shaft 28 can be swingably suspended. The stopper pieces 29 are brought into contact with each other, and the stopper pieces 29 are positioned above the void portions 22 of the claw pieces 19 and loosely fitted in the hook holes 18 of the surface lid 17. The hook hole 18 is formed so as to be elongated in the lateral direction (the swing direction of the claw piece 19) in the outer peripheral portion of the surface lid 17.

As shown in FIG. 3, the above-mentioned engagement projection 26 is designed to engage with the lower surface 19a of the claw piece 19 when the claw piece 19 and the regulation piece 25 swing greatly to the right. The vertical position and the protrusion amount are set, and the engaging projection 26 and the lower surface 19a form the locking mechanism of the present invention.

Next, the operation mode of the above embodiment will be described.

First, when the surface lid 17 is fitted to the seat frame 15, as shown in FIG. 1, the claw piece 19 and the regulation piece 25 hang down by its own weight, and the claw 20 is moved outward so that the engaging teeth 16 are formed. Engage and plug 29
Moves upward and fits into the hook hole 18 to close it. In this case, the restriction piece 25 is outside (left side) the back surface of the claw piece 19.
And the engaging force between the claw 20 and the engaging tooth 16 is increased.

Further, when the ground cover 17 is opened, as shown in FIG. 1, an operating rod 30 having a lower end operating piece 30a formed in a T shape is prepared, and the longitudinal direction of the operating piece 30a is provided with a hook hole 18. In the longitudinal direction, and push downward in this state.

Then, even if the plug piece 29 is moved downward and the hook hole 18 is opened, the operation piece 30a and the plug piece 29 are fitted into the void portion 22 of the claw piece 19 and the claw piece 19 is not opened.

Next, as shown in FIG. 2, when the operation piece 30a is rotated about 90 degrees about its axis, both ends of the operation piece 30a are claw pieces 19a.
Straddling the upper surface of each of the operating pieces 24, 24, whereby the operating piece 24 is pressed slightly downward and the claw piece 19 is retracted (to the left).
The pawl 20 is disengaged from the engaging tooth 16 when rotated.
In this case, since the center of the lower end of the T-shaped portion is in contact with the stopper piece 29, the regulation piece 25 is also rotated inward (withdrawal direction) at the same time.

Next, when the operating piece 30a is moved downward in this state, as shown in FIG. 3, the operating piece 24 is further pressed downward, and the pawl piece 19 and the regulating piece 25 are largely rotated in the retreating direction. The locking mechanism provided between them operates, that is, the lower surface of the claw piece 19.
19a engages with the upper surface of the engagement protrusion 26 of the restriction piece 25, and as a result, both are largely retracted and cannot be restored.

In this state, the operating rod 30 is pulled upward.

Then, both shoulders 30b and 30b of the operation piece 30a are engaged with the inner surface of the hook hole 18, and the ground cover 17 is opened from the seat frame 15.

When the operation of the locking mechanism is released when the surface lid 17 is closed, only the restriction piece 25 and the stopper piece 29 are pressed downward by the operation piece 30a to move the restriction piece in the left rotation direction in FIG. When the claw piece 19 is disengaged from the engaging projection 26, the claw piece 19 and the regulation piece 25 are returned (rotated right) by their own weight, and the claw 20 is engaged with the engaging tooth 16 again. Will be done.

(Effects of the Invention) As is clear from the above description, according to the present invention, the ground lid does not open only by pushing the operating rod through the hook hole, and after rotating the operating rod by a predetermined angle about its axis, The surface lid can only be opened by further pressing.

For this reason, there is no risk that the surface lid will be inadvertently opened by a third party other than the parties concerned, and a spark will be generated when the operating rod is pushed through the hook hole, which will cause gas to fill the underground conduit. Even if a flammable situation occurs, the surface lid does not open suddenly, and the safety is enhanced.

[Brief description of drawings]

1 to 3 show an operating state showing an embodiment of the present invention, and FIG. 1 is a sectional view of an essential part showing an operating state of a locking device,
FIG. 2 is a sectional view of a main part showing a state in the middle of releasing it, FIG. 3 is a sectional view of the main part showing its released state, FIGS. 4 and 5 are a front view and a side view of a claw piece, FIG. 6 and FIG. FIG. 7 is a front view and a side view of the restriction piece, and FIG. 8 is a cross-sectional view of a main part showing a conventional example. 15: Seat frame, 16: Engaging teeth, 17: Ground cover, 18: Hook hole, 19: Claw piece, 1
9a: Lower surface (locking mechanism), 20: Claw, 21: Suspended arm, 22: Void,
23: Shaft, 24: Actuating piece, 25: Restricting piece, 26: Engaging projection (locking mechanism), 27: Suspended arm, 28: Shaft, 29: Plug piece, 30: Operation rod, 30a: Operation piece.

Claims (2)

[Claims] 1. A back surface of a ground cover, wherein a ground cover is openably and closably fitted to a seat frame provided at an opening edge of an underground conduit, and engaging teeth projecting inward are provided on an inner peripheral portion of the seat frame. The claw piece and the regulating piece, which sequentially inward with respect to the engaging tooth, are suspended and supported in a swingable manner. An engaging tooth and a disengageable claw, a cavity with an open upper surface, and operating pieces that are orthogonal to the swing axis of the claw piece and project outwardly on both upper sides of the cavity. The ground cover is formed with a hook hole that faces the cavity of the claw piece, and a cap piece that is loosely fitted in the cavity of the claw piece and that can be removably fitted into the hook hole is provided on the upper portion of the regulation piece. Locking device for the surface cover of underground pipes. 2. A locking mechanism is provided between the pawl piece and the restriction piece so as to engage with each other when the pawl piece and the restriction piece swing by a predetermined angle toward the anti-engagement tooth direction. Locking device for surface lids of underground pipes.