JP2740641B2 - Locking device for iron cover for manhole - 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 an iron cover for a manhole, and more particularly to an iron cover that can be easily opened and closed by a hook, and that a hook hole can be securely closed. The present invention relates to a locking device for a manhole iron cover that can prevent the strength of the cover from decreasing.

[0002]

2. Description of the Related Art Conventionally, as a locking device for an iron lid fitted into a receiving frame, there is a device disclosed in Japanese Utility Model Publication No. 58-3892. Hereinafter, this conventional locking device will be described with reference to the drawings. FIG. 13 is a cross-sectional view showing a state where the iron cover is locked by the conventional locking device, and FIG. 14 is a cross-sectional view showing a state where the iron cover is unlocked by the conventional locking device.

In FIGS. 13 and 14, 1 is a receiving frame, 2 is an iron cover fitted in the receiving frame 1, and 3 is a lock body. In the lock body 3, a rotation shaft 4 formed in an intermediate portion is loosely fitted in a groove 5 formed in a lower surface of the iron cover 2. Therefore, the lock body 3 rotates around the rotation shaft 4 and is movable along the groove 5. Numeral 6 denotes a small lid for closing an opening 7 formed at the upper edge of the lock body 3 at the peripheral edge of the iron lid 2, 8 denotes a hook formed at the lower end of the lock body 3, and 9 denotes a hook. A hook receiver protruding from the inner peripheral surface of the receiving frame 1 and engaging with the hook 8 of the lock body 3.

According to the conventional locking device configured as described above, as shown in FIG. 14, when the tip of the burl 10 is inserted into the opening 7 of the iron cover 2 and the closing cover 6 is pushed downward,
The lock body 3 rotates counterclockwise in FIG. 14 around the rotation shaft 4 and moves along the groove 5 away from the hook receiver 9. As a result, the hook 8 comes off the hook receiver 9 and the locking of the iron cover 2 is released. Thereafter, when the burl 10 is rotated downward with the tip of the burl 10 inserted into the opening 7 of the iron cover 2, the iron cover 2 can be pry open.

On the other hand, when closing the iron cover 2, the iron cover 2 may simply be fitted into the receiving frame 1. That is, when the iron cover 2 in which the lock body 3 has returned to the state as shown in FIG. 13 in the horizontal state is fitted into the receiving frame 1, the hook 8 comes into contact with the hook receiver 9 so that the lock body 3 5 along the direction away from the hook receiver 9. As a result, when the hook 8 gets over the hook receiver 9, the lock body 3 is now rotated clockwise in FIG. As a result, the hook 8 is engaged with the hook receiver 9 and the iron cover 2 is locked.

[0006]

However, the conventional locking device described above has the following problems. After the iron cover 2 has been pryed open by the crowbar 10, the iron hook 2 must be opened by inserting a hook into another hand hook hole, and it takes time and effort to open the iron cover 2. Since the opening 7 for the closing small lid 6 is formed at the peripheral edge of the iron lid 2, the strength of the iron lid 2 is reduced. Since the opening 7 for the closing small lid 6 is formed in the peripheral edge of the iron lid 2, there is a gap between the small lid 6 and the opening 7, and the opening 7 cannot be sufficiently closed.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a manhole iron which can easily open and close an iron cover with a hook, can securely close a hook hole, and does not reduce the strength of the iron cover. An object of the present invention is to provide a lid locking device.

[0008]

An invention according to claim 1 is a locking device for a manhole iron cover for locking an iron cover fitted in a receiving frame, wherein the iron cover near a periphery of the iron cover. A lock body having an intermediate portion rotatably mounted on a lower surface of the iron cover in a plane perpendicular to the iron cover , and a peripheral portion of the iron cover corresponding to a mounting position of the lock body.
A hook hole formed in the iron cover portion inside and a lower portion rotatably suspended at an upper end portion of the lock body.
It has a small lid for closing the hand hook hole having a weight portion, and a hook receiver formed on the inner surface of the receiving frame and engaging with the lock body. When the iron cover is closed, the lock body rotates by its own weight in a direction in which the hook engages with the hook receiver around a shaft attachment portion with the iron cover,
At the same time, push up the small lid to close the hook,
When the iron cover is opened, the lock body is characterized in that the hook rotates around the shaft attaching portion in a direction in which the hook comes off the hook receiver as the small cover descends against its own weight. is there.

The invention according to claim 2 is characterized in that the lock body has a stopper for restricting the rotation of the closing small lid.

[0010] The invention according to claim 3 is characterized in that the closing small lid is kept horizontal by its own weight.

According to a fourth aspect of the present invention, the upper surface of the closing small lid is closed when the small hook covers the hand hook hole.
It is characterized by being lowered from the upper surface of the iron lid.

According to a fifth aspect of the present invention, the hand hook hole has a step on the inner peripheral surface thereof for contacting the upper surface of the small lid.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a locking device for a manhole according to the present invention. FIG. 1 is a plan view showing a locking device of the present invention, and FIG.
FIG. 3 is a front view showing the locking device of the present invention, FIG. 3 is a side view showing the locking device of the present invention, FIG. 4 is a bottom view showing the locking device of the present invention, and FIG. FIG. 6 is a perspective view of the locking device according to the present invention.
(A) to (D) are explanatory views of the operation of the stopper formed on the lock body in the locking device of the present invention, and FIG.
FIG. 9 is a cross-sectional view showing a locked state by the locking device of the present invention.
FIG. 10 is a cross-sectional view showing a state before a hand hook is inserted into a hand hook hole in the locking device of the present invention. FIG. FIG. 11 is a cross-sectional view showing a pressed state, FIG. 11 is a cross-sectional view showing a state in which a hand hook inserted into a hand hook hole in the locking device of the present invention is rotated, and FIG. It is sectional drawing which shows the state which opens an iron lid by the inserted hand hook.

1 to 12, reference numeral 11 denotes a receiving frame having a hook receiver 11A formed on an inner surface thereof;
The iron cover 13 fitted in the inside is a lock body having a weight portion 13A at a lower portion. Reference numeral 14 denotes a rotating shaft protruding horizontally (parallel to the iron lid 12) on both side surfaces of the upper part of the lock body 13. The rotating shaft 14 is rotatably fitted in a pair of grooves 15 formed opposite to each other at a lower portion near the periphery of the iron lid 12. As a result, the lock body 13 is
It rotates freely in a plane orthogonal to 2. Groove 15
A pull-out preventing piece 16 is fixed at the entrance of the so as to prevent the rotating shaft 14 from coming out of the groove 15. Reference numeral 17 denotes a hook provided at a lower portion of the lock body 13, which engages with the hook receiver 11A to lock the iron lid 12 when the iron lid is closed.

When the iron cover is closed, the lock body 13 is
The action of the hook 1 around the rotation shaft 14 by the action of 3A
7 rotates in a direction to engage with the hook receiver 11A, and at the same time, pushes up the small lid to close the hand hook hole. On the other hand, when the iron lid is opened, the lock body 13 rotates with the lowering of the small lid. 1
The hook 17 rotates around the center 4 in a direction to come off the hook receiver 11A against its own weight. Reference numeral 18 denotes a stopper protruding below the rotation shaft 14 of the lock body 13 for restricting rotation of the small lid. Reference numeral 19 denotes a pair of arms fixed to the rotating shaft 14. On the inner side of the distal end of the arm 19, a projection 1 rotatably fitted in a groove formed in the small lid.
9A are formed facing each other. The small lid and the hook hole will be described later.

Reference numeral 20 denotes a hand hook hole formed in an iron cover portion corresponding to the mounting position of the lock body 13 and inside the periphery of the iron cover 12. The hand hook hole 20 is formed in an upwardly tapered shape, and a step portion 20A with which the small lid comes into contact is formed on an inner peripheral surface thereof. 21 is the weight 2 at the bottom
1A is a small lid for closing the hand hook hole 20. The side surface of the small lid 21 is formed in an upwardly tapered shape so as to match the tapered hand hook hole 20. Grooves 21B are formed on the lower side surfaces of the small lid 21, and projections 19A of the lock body 13 are rotatably fitted in the grooves 21B. The small lid 21 moves up and down while maintaining the level by the action of the weight portion 21A.

According to the locking device of the present invention configured as described above, the iron cover is opened and closed as follows.
That is, as shown in FIG. 9, the T-shaped tip of the hand hook 22 is aligned with the hand hook hole 20, and the hand hook 22 is inserted into the hand hook hole 20 as shown in FIG. As a result, the closing lid 21 is pushed down while maintaining the horizontal position. Since the length of the T-shaped tip is longer than the width of the hand hook hole 20, the hand hook 22 is inserted into the hand hook hole 20 unless the T-shaped tip is aligned with the longitudinal direction of the hand hook hole 20. Can not do. In this way,
When the small lid 21 is pushed down, the lock body 13 rotates counterclockwise in FIG. 9 about the rotation shaft 14, the hook 17 comes off the hook receiver 11 </ b> A, and the locking of the iron lid 12 is released. . Thus, when the locking of the iron lid 12 is released, the hand hook 22 is rotated 90 ° as shown in FIG. In this case, since the small lid 21 is pushed down while maintaining the horizontal position, the T-shaped tip of the hand hook 22 can be easily rotated. As a result, the T-shaped tip of the hand hook 22 is engaged with the hand hook hole 20, so that the hand hook 22 does not fall out of the hand hook hole 20. When the hook 22 is hooked on the hook hole 20, the hook 22 is pulled up as shown in FIG. Thereby, the iron lid 12 is opened.

On the other hand, to close the iron lid 12, the iron lid 12 is closed.
May be fitted into the receiving frame 11 as it is. In this case, as shown in FIGS. 7A to 7D, the small lid 21 hits the stopper 18 of the lock body 13, so that the small lid 21 is inverted and the heavy cone 21A projects from the iron lid 12. Nothing happens. FIG. 7B shows a normal position of the small lid 21. When the iron lid 12 is fitted into the receiving frame 11,
The lock body 13 naturally rotates by its own weight, and the hook 17 is engaged with the hook receiver 11A. At the same time, the small lid 21 is pushed up by the lock body 13, whereby the hand hook hole 20 is automatically closed.
Since the upper surface of the small lid 21 is slightly lower than the upper surface of the iron lid 12, even if a car or the like passes over the hand hook hole 20, the small lid 21 is pushed down, and the hook 17 does not come off the hook receiver 11A. . Moreover, since the hand hook hole 20 is formed at a portion slightly inward from the periphery of the iron cover 12, the iron cover 1
Not only is there no risk of lowering the strength of No. 2 but also a gap is hardly formed between the small lid 21 and the hook hole 20. Therefore, the small lid 21 abuts on the step 20A formed on the inner peripheral surface of the hand hook hole 20, and the hand hook hole 20 is sealed, and the sand or rainwater from the hand hook hole 20 into the manhole is combined. And the like can be reliably prevented.

[0019]

As described above, the present invention has the following industrially useful effects. When the hook is inserted into the hook hole, the closing lid descends while maintaining the horizontal position, so that the T-shaped tip of the hook can be easily rotated. Therefore, the iron lid can be easily opened by the hook. Since the hook hole is formed in a portion slightly inside from the edge of the iron lid, the strength of the iron lid does not decrease. Since the hand hook hole is formed slightly inward from the edge of the iron lid, a gap is not easily formed between the hand hook hole and the small lid. Therefore, sand, rainwater, and the like hardly enter the manhole. This effect is more remarkably exhibited by forming a step portion in contact with the small lid on the inner peripheral surface of the hand hook hole.

[Brief description of the drawings]

FIG. 1 is a plan view showing a locking device of the present invention.

FIG. 2 is a front view showing the locking device of the present invention.

FIG. 3 is a side view showing the locking device of the present invention.

FIG. 4 is a bottom view showing the locking device of the present invention.

FIG. 5 is a rear view showing the locking device of the present invention.

FIG. 6 is an assembled perspective view of the locking device of the present invention.

FIG. 7 is an operation explanatory view of a stopper formed on the lock body in the locking device of the present invention.

FIG. 8 is a sectional view showing a locked state by the locking device of the present invention.

FIG. 9 is a cross-sectional view showing a state before a hook is inserted into a hook hole in the locking device of the present invention.

FIG. 10 is a cross-sectional view showing a state in which a hook is inserted into a hook hole and a closing lid is pushed down in the locking device of the present invention.

FIG. 11 is a cross-sectional view showing a state in which a hand hook inserted into a hand hook hole in the locking device of the present invention is rotated.

FIG. 12 is a cross-sectional view showing a state where the iron cover is opened by a hook inserted into a hook hole in the locking device of the present invention.

FIG. 13 is a cross-sectional view showing a state where an iron lid is locked by a conventional locking device.

FIG. 14 is a cross-sectional view showing a state in which the locking of an iron lid is released by a conventional locking device.

[Explanation of symbols]

 1: Receiving frame 2: Iron cover 3: Lock body 4: Rotating shaft 5: Groove 6: Small cover 7: Opening 8: Hook 9: Hook receiver 10: Bar 11: Receiving frame 11A: Hook receiver 12: Iron cover 13: Lock body 13A: Weight cone 14: Rotating shaft 15: Groove 16: Pull-out preventing piece 17: Hook 18: Stopper 19: Arm 19A: Projection 20: Hand hook hole 20A: Step 21: Small lid 21A: Weight cone 21B: Groove 22: Hand hook

Claims (5)

(57) [Claims] 1. A locking device for a manhole iron cover for locking an iron cover fitted in a receiving frame, comprising: a lower portion of the iron cover near a periphery of the iron cover, in a plane orthogonal to the iron cover. A lock body having an intermediate portion pivotally mounted on the lock body, and a lock body corresponding to a mounting position of the lock body , and
A hand hook hole formed in the iron cover portion inside the peripheral edge of the iron cover, and a rotatably suspended upper end of the lock body.
A lower lid having a weight portion at a lower portion, a small lid for closing the hook and a hook receiver formed on an inner surface of the receiving frame and engaging with the lock body, wherein the lock body is The lower part has a hook that engages with the hook receiver, and when the iron lid is closed, the lock body is moved by its own weight in a direction in which the hook engages with the hook receiver about a shaft attachment portion with the iron lid. Rotate, at the same time, push up the small lid to close the hook, and when the iron lid is open, the lock body is
A locking device for a manhole iron cover, wherein the hook rotates around the shaft attachment portion in a direction of being disengaged from the hook receiver as the small lid descends against its own weight. 2. The locking device according to claim 1, wherein the lock body has a stopper for restricting rotation of the closing lid. 3. The locking device according to claim 1, wherein the closing lid is kept horizontal by its own weight. 4. The apparatus according to claim 1, wherein an upper surface of the closing lid is lowered from an upper surface of the iron lid when the hook is closed. A locking device according to claim 1. 5. The hand hook according to claim 1, wherein the hook has a step on an inner peripheral surface thereof, the step being in contact with an upper surface of the small lid. Locking device.