JPH02183019A - Locker for surface cover for underground pipeline - Google Patents

Abstract

PURPOSE:To raise the safeness of a cover on the ground's surface by preventing blowing-off of it by gas-explosion in an underground pipeline by a method in which a claw part and a regulating part are hung down under their weights, the claw is coupled with a coupling tooth, and a stopper piece is fitted with a hook hole to close. CONSTITUTION:A ground's surface cover 17 is fitted into a seat frame 15 provided on the opening edge of an underground pipeline, and a claw part 19 and a regulating part 25 are hung down from the back side of the cover 17 in a rocking manner. A claw 20 moves outwards to couple with a coupling tooth 16, and a stopper piece 29 moves upwards to fit with a hook hole 18 to close it. When the cover 17 is opened, an operating bar 30 is pushed downwards, whereupon the piece 29 moves to open the hole 18. The operating piece 30a and the piece 29 are fitted into the space 22 of the part 19 to prevent opening action. The cover 17 can thus be opened by turning the bar 30 through a given angle and then pushing it in, but not only by pushing it.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a locking device for a surface cover 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 art, there is one described in Japanese Utility Model Application Publication No. 63-45857.

That is, as shown in FIG. 8, engagement teeth 3 are formed to protrude inward on the inner periphery of the seat frame 2 that receives and stops the ground surface M1.

The claw piece 4 and the regulation piece 8 are connected to the engagement teeth 3 on the back surface of the ground cover 1.
Place them sequentially to the right (inward).

The regulation piece 8 is supported in a swingable manner via an intermediate member 10.
The lower end left portion 8a is brought into contact with the lower right surface 4a of the pawl piece 4.

The pawl piece 4 has engaging teeth 3 and a removable pawl 5 protruding from its lower left surface, and has a bimata-shaped branch piece 6 formed at its upper part, and the upper part of this branch piece 6 is attached to the back surface of the ground surface ML. Fixed intermediate member 10
It is suspended and supported so that it can rotate.

Further, the regulation piece 8 has an opening arm 9 extending to the left on its upper part, and a left-right intermediate portion of the opening arm 9 is rotatably suspended from an intermediate member 10. The left side of 9 passes through the space 7 between each branch 6 of the pawl piece 4.

At the left end of the lid opening arm 9, there is a suppressing part 9 that projects downward.
a and a frame piece 9b projecting upward, the pressing part 9a is brought into contact with the contact surface 4b formed on the upper outer surface between each branch piece 6, and the frame piece 9b is formed on the outer peripheral end of the ground cover 1. It is removably fitted into a square hole 1a formed through the (left end).

As a result, during normal operation, pawl piece 4 and regulation piece 8
rotates to the left in FIG. 8 due to its own weight, the pawls 5 engage with the engaging teeth 3, and the frame piece 9b fits into the square hole 1a to close it.

In addition, when opening the ground surface Ml, as shown in FIG. is rotated to the right, and its pressing portion 9a presses the contact surface 4b of the pawl piece 4, causing the pawl piece 4 to be rotated to the right and the pawl 5 to be disengaged from the engagement tooth 3.

Next, the operating rod 11 is rotated to the left about its lower end to open the ground surface M1.

(Problems to be Solved by the Invention) In the conventional device described above, when the operating rod 11 is pushed through the square hole 1a, the pawl piece 4 rotates to the right via the regulating piece 8, and the pawl 5 moves to the engagement tooth 3. Since the ground cover 1 was designed to be detached from the ground, there was a risk that the ground cover 1 would be inadvertently opened by a third party other than those involved.

Also, sparks will be generated when the operating rod 11 is forcefully pushed through the square hole 1a, but in this case, if the underground pipe is filled with gas, this gas will burn, or explode. There were drawbacks such as the ground cover 1 flying off, which was dangerous.

SUMMARY OF THE INVENTION An object of the present invention is to obtain a new locking device for a surface cover for an underground conduit, which eliminates the above-mentioned drawbacks.

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

That is, the ground cover is fitted into a seat frame provided at the opening edge of the underground conduit so as to be openable and closable, and engagement teeth that protrude inward are provided on the inner periphery of the seat frame to engage with the back surface of the ground cover. A pawl piece and a regulating piece are swingably supported in a suspended manner so as to move inward toward the tooth, and the restricting piece is brought into contact with the inner back surface of the pawl piece, and the pawl piece has engaging teeth on its lower outer surface. A ground cover is provided with a claw that can be engaged and detached from the ground cover, a gap portion whose top surface is open, and actuating pieces that are perpendicular to the swing axis of the claw piece and protrude outward on both sides of the top of the gap portion. A square hole facing the cavity of the pawl piece is formed through the plate, and a frame piece is provided on the upper part of the regulating piece, which loosely fits into the cavity of the pawl piece and removably fits into the square hole.

Further, a locking mechanism is provided between the pawl piece and the regulating piece so that they engage with each other when both are swung by a predetermined angle toward the anti-engaging tooth direction.

(Function) Since the present invention has the above structure, under normal conditions, the pawl pieces and the regulating piece hang down due to their own weight, the pawls are moved outward and engage with the engaging teeth, and the frame piece moves upward and fits into the square hole, closing it.

In addition, when opening the ground cover, when an operating rod with a T-shaped tip is pushed through the square hole, the frame piece is moved downward and the square hole is opened. The lower part of the lever fits into the gap in the pawl piece, and the pawl piece cannot be opened. 6 Next, when the operating piece is rotated approximately 90 degrees around its axis, both ends of the T-shaped part of the operating piece will open. When the operating rod is moved downward in this state while straddling the upper surface of the piece, the actuating piece is pressed downward and the pawl pieces are rotated inward (in the retraction direction), and the pawls are separated from the engagement teeth. It turns out. In this case, since the center portion of the lower end of the T-shaped portion is in contact with the frame piece, the regulating piece is also rotated inward (in the retracting direction) at the same time.

Further, when the amount of rotation of the pawl piece and the regulating piece in the retracting direction reaches a predetermined value, a locking mechanism provided between the pawl piece and the regulating piece is engaged, and both are held at a predetermined retracted position.

(Example) Embodiments of the present invention will be described below based on the drawings.

In the drawings, Fig. 1 is a sectional view of the main part showing the operating state of the locking device, Fig. 2 is a sectional view of the main part showing the state in the middle of release, Fig. 3 is a sectional view of the main part showing the unlocking state, and Fig. 5 and 5 are a front view and a side view of the pawl piece, and FIGS. 6 and 7 are a front view and a side view of the regulation piece.

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

A disk-shaped or rectangular plate-shaped ground cover 17 is fitted to the inner periphery of the seat frame 15 so as to be openable and closable. The right end of the ground cover 17 is rotatably connected to the seat frame 15 by a pin (not shown).

Engagement teeth 16 that protrude inwardly and downwardly are integrally formed on the left inner peripheral portion of the seat frame.

On the left side of the back surface of the ground cover 17, there are a claw piece 19 and a regulation piece 2.
5 are suspended and supported so as to be swingable in the left and right direction.

As shown in FIG. 1, FIG. 4, and FIG. A pair of suspension arms 21 and 2 that protrude upward while being separated from each other in the left-right direction in the figure.
1 is formed, and a cavity 22 whose upper surface is open is formed by each of these hanging arms 21, 21.

Further, on the upper part of each suspension arm 21, 21, as shown in FIG. 4, there are shafts 23, 23 projecting outward in the width direction, and an actuating piece projecting in the direction of the seat frame 15 (leftward in FIG. 5). 24, and the shafts 23 and 23 are connected to the back surface of the ground cover 17 (
(Symbol omitted) is swingably suspended.

Further, as shown in FIGS. 1, 6, and 7, the aforementioned regulating piece 25 has an engaging protrusion 26 formed on the lower outer surface portion thereof and protruding in the direction of the pawl piece 19.

An elongated suspension arm 27 is formed extending upward and leftward from the center in the width direction, and as shown in FIG.
The shafts 28, 28 protrude outward in the width direction, and the seat frame 15 direction (
It is formed integrally with a frame piece 29 that projects to the left (in FIG. 7).

The frame piece 29 is formed to have a width that allows it to fit loosely into the gap 22 of the pawl piece 19 described above.

As shown in FIG. 1, the regulation piece 25 is arranged to the right of the claw piece 19, and its shafts 28 are swingably suspended on the back surface of the ground cover 17 via brackets (not shown). The frame piece 29 is positioned above the gap 22 of the claw piece 19 and loosely fitted into the hook hole 18 of the ground cover 17. . The hook hole 18 is formed in the left and right direction (claw piece 1
It is formed into a long and narrow penetrating structure in the direction of swinging force (9).

In addition, as shown in FIG. 3, the above-mentioned engaging projection 26 is
The vertical position and protrusion amount of the pawl piece 19 and the regulating piece 25 are set so that the pawl piece 19 and the regulating piece 25 engage with the lower surface 19a of the pawl piece 19 when the pawl piece 19 swings greatly toward the right, and the engagement protrusion 26 and the lower surface 19a constitute the locking mechanism of the present invention.

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

First, the ground cover 17 is fitted to the seat frame 15.

As shown in FIG. 1, the pawl piece 19 and the regulating piece 25 hang down under their own weight, the pawl 20 is moved outward and engages with the engaging tooth 16, and the frame piece 29 is moved upward to form the hook hole. 18 to close it. In this case, the regulating piece 25 presses the back surface of the pawl piece 19 outward (to the left), increasing the engagement force between the pawl 20 and the engagement teeth 16.

In addition, when opening the ground cover 17, as shown in FIG.
An operating piece 30 having a T-shaped operating piece 30a at the lower end is prepared, the longitudinal direction of the operating piece 30a is directed toward the longitudinal direction of the hook hole 18, and the operating piece 30a is pushed downward in this state.

Then, although the frame piece 29 is moved downward and the hook hole 18 is opened, the operating piece 30a and the frame piece 29 fit into the gap 22 of the pawl piece 19, and the pawl piece 19 is not operated to open.

Next, as shown in FIG. 2, when the operating piece 30a is rotated approximately 90 degrees around its axis, both ends of the operating piece 30a straddle the upper surface of each operating piece 24 of the pawl piece 19. , the actuating piece 24 is pressed slightly downward, the pawl piece 19 is rotated in the retracting direction (to the left), and the pawl 20 is disengaged from the engagement tooth 16. In this case, the center of the lower end of the T-shaped portion is in contact with the frame piece 29.

The regulating piece 25 is also rotated inward (in the retreat direction) at the same time.

Next, when the operation piece 30a is moved downward in this state,
As shown in FIG. 3, the actuating piece 24 is further pressed downward, and the pawl piece 19 and the regulating piece 25 are largely rotated in the retracting direction, and the locking mechanism provided between them is activated, that is, the pawl piece 1
The lower surface 19a of the regulating piece 25 engages with the upper surface of the engaging protrusion 26 of the regulating piece 25, and as a result, both of them are largely retracted and cannot return.

In this state, pull the operating rod 30 upward.

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

Note that when the above-mentioned locking mechanism is released when the ground cover 17 is closed, the control piece 25 and the stopper piece 29 are operated by the operation piece 30a.
When the regulating piece is slightly rotated in the counterclockwise rotation direction in FIG. 3 by pressing down only, the pawl piece 19 is disengaged from the engagement protrusion 26.

As a result, the pawl piece 19 and the regulating piece 25 return to normal (rotate clockwise) due to their own weight, and the pawl 20 engages with the engagement tooth 16 again.

(Effects of the Invention) As is clear from the above description, the present invention provides that the surface cover cannot be opened simply by pushing the operating rod through the hook hole. The ground cover can only be opened by pushing further.

This eliminates the risk of the underground cover being opened carelessly by a third party other than those involved, and also prevents sparks from being generated when the operating shaft is pushed through the hook hole, which may cause the gas filling the underground pipe to explode. Even in the event of a fire, the surface cover will not open suddenly, resulting in increased safety.

[Brief explanation of the drawing]

1 to 3 show the operating state of an embodiment of the present invention, FIG. 1 is a sectional view of the main part showing the operating state of the locking device, and FIG. 2 is a sectional view of the main part showing the state in the middle of release. Fig. 3 is a sectional view of the main part showing the released state, Figs. 4 and 5 are a front view and a side view of the claw piece, Figs. 6 and 7 are a front view and a side view of the regulation piece, Fig. 8 is a sectional view of a main part showing a conventional example. 15: Seat frame, 16: Engagement tooth, 17: Ground cover, 18: Hook hole, 19: Claw piece, 19a: Lower surface (locking mechanism), 20: Claw,
21: Hanging arm, 22: Gap, 23: Shaft, 24: Actuation piece, 25: Regulation piece, 26: Engagement protrusion (locking mechanism), 27:
Hanging arm, 28: Axis, 29: Frame piece, 30: Operating rod, 30a
: Operation piece. Figure 3 Figure 4 Figure 5 Application agent Hisashi Matsumoto

Claims (1)

[Scope of Claims] 1. A ground cover is fitted into a seat frame provided at the opening edge of the underground conduit so as to be openable and closable, and engaging teeth protruding inward are provided on the inner circumference of the seat frame, A pawl piece and a regulation piece are swingably supported on the back surface of the lid, moving inward toward the engagement teeth in a swingable manner, and the restriction piece is brought into contact with the inner back surface of the pawl piece, and the pawl piece is attached to the lower part of the lid. An engaging tooth on the outer surface, a removable claw, and a cavity with an open top surface;
Operating pieces are provided on both sides of the upper part of the gap and protrude outward and perpendicular to the swing axis of the claw piece, and a hook hole facing the gap of the claw piece is formed in the ground cover to penetrate and control the movement. A locking device for a surface cover for an underground conduit, characterized in that a plug piece is provided on the top of the piece, and is loosely fitted into the gap of the claw piece and removably fitted into the hook hole. 2. The underground pipe according to claim 1, characterized in that a locking mechanism is provided between the pawl piece and the regulating piece so that they engage with each other when both are swung at a predetermined angle toward the anti-engaging tooth direction. Locking device for road surface cover.