JPH11193541A - Lock device of protection cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safe lock device incapable of simply releasing a lock only by pushing a normal bar-shaped body thereinto. SOLUTION: In a lock device pivoting a locking member 4 on the rear side of a protection cover 2 detachable to a cover holding frame 1 in a turnable manner, the locking member 4 includes a horizontal cylinder section 4a inserting a bearing 5 thereinto, a projection 4b projected upward from the circumferential surface of the horizontal cylinder section, a hook 4c projected downward from the circumferential surface of the horizontal cylinder section and bending the front end forward and arm section 4d projected backward from the circumferential surface of the horizontal cylinder section. A projection 1b interlocking the hook 4c of the locking member 4 from below is projected to the inside of the cover holding frame 1, and an insertion port 2a for inserting a lock releasing device therein is adjacent to the projection 4b of the locking member 4 and is formed in the end of the protection cover 2. The lock releasing device inserted from the insertion port 2a is rotated, and when the projection 4b of the locking member 4 is not pushed from the back by a pin section of the front end thereof, the lock can not be released.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock device for a protective cover which is attached to and detached from a cover receiving frame.

[0002]

2. Description of the Related Art As is well known, a public basin is installed at a connection point between a drainage pipe in a residential land and a public sewage pipe under the ground of a public road near a public-private boundary line, and rises from this public basin. At the upper end of the height adjustment cylinder, an inner lid for a public basin is attached. Then, a cover receiving frame is arranged so as to surround the inner cover for the public square, and a protective cover is attached to the lid receiving frame to protect the inner lid for the public square. Such protective lids are usually provided with a locking device.

FIG. 7 shows an example of a lock device for a protective cover.
The following are known. This locking device 30
The lock member 3 is attached to the bearing portion 20a on the back surface of the protective lid 20.
The lower shaft 30b of the lock member 30a is inserted into the hole 10b of the bracket 10a protruding from the inner surface of the lid receiving frame 10, and the upper side surface of the lock member 30a is inserted into the hole 10b. A compression coil spring 30d is provided between the protective cover 20 and the reinforcing rib 20b on the back surface. And this compression coil spring 3
0d, the lock member 30a is constantly urged clockwise in the clockwise direction, and the lower end hook portion 30c of the lock member 30a is engaged with the front end portion of the bracket 10a from below, so that the protective cover 2
0 is locked so as not to open.

[0004] In such a lock device 30, as shown by a dashed line, the lock release rod 40 is connected to the notch 20
When the lock member 30a is rotated counterclockwise as shown by a dashed line against the elastic force of the compression coil spring 30d, the lower hook portion 30c of the lock member 30a and the bracket 10a are rotated. The engagement with the tip is released, and the protective cover 20 can be opened.

[0005]

However, in the lock device 30 described above, the lock member 30a rotates counterclockwise only by pushing a normal rod-shaped member from the notch 20c of the protective cover 20 to rotate the lock member 30a. Since the engagement between the lower end hook portion 30c of the bracket 30a and the tip of the bracket 10a is released, there is a risk that the child may mischief and open the protective cover 20.

The compression coil spring 30d is susceptible to corrosion in a short period of time, and as the corrosion progresses, the spring force is greatly reduced, so that the engagement between the lower end hook 30c of the lock member 30a and the tip of the bracket 10a becomes loose. As a result, the lower end hook portion 30c tends to come off.

SUMMARY OF THE INVENTION In view of the above problems, the present invention is a safe lock device in which a lock cannot be easily released simply by pushing in a normal rod-shaped body, and furthermore, there is no fear of causing corrosion of a coil spring or loosening of a lock. The aim is to provide no locking device.

[0008]

According to a first aspect of the present invention, there is provided a locking device for a protective cover, wherein a locking member is provided on a back surface of an end of the protective cover which is attached to and detached from a cover receiving frame. A locking device movably mounted on a shaft, wherein the locking member includes a horizontal cylindrical portion through which a support shaft is inserted, a protrusion protruding upward from an outer peripheral surface of the horizontal cylindrical portion, and A hook portion protruding downward from the outer peripheral surface of the portion and having a tip bent forward, and an arm portion protruding rearward from the outer peripheral surface of the horizontal tubular portion, inside the lid receiving frame. Is provided with a projection in which a hook portion of the locking member is engaged from below, and an insertion opening for inserting an unlocking tool is formed at an end of the protective cover adjacent to the projection of the locking member. It is characterized by having been done.

The locking device for a protective cover according to a second aspect of the present invention is the locking device of the first aspect, wherein a weight portion is formed at a tip of an arm portion of the locking member.

According to the first aspect of the present invention, when the protective lid is attached to the lid receiving frame, the hook is locked in the direction approaching the convex portion of the lid receiving frame by gravity acting on the arm of the locking member. Since the rotation moment (rotation moment about the support shaft) for rotating the member is generated, the locking member does not rotate in the reverse direction, and the bent tip of the hook engages with the projection of the lid receiving frame from below. In the locked position (lock position). Therefore, even if an attempt is made to open the protective cover, the distal end of the hook portion engages with the convex portion of the lid receiving frame from below, so that the protective cover cannot be opened.

On the other hand, when opening the protective cover, an unlocking tool having a pin protruding from one or both ends of the tip is inserted through the insertion opening of the protective cover and rotated by about 90 degrees. Push the projection forward from behind. Then, the locking member reverses the rotation moment in the direction in which the hook part is separated from the convex part of the lid receiving frame, and the bent end of the hook part does not engage with the convex part from below ( (The lock release position), the protective cover can be opened.

In this locking device, as described above, by pressing the projection of the locking member forward from behind with the pin portion of the unlocking tool, the protective lid is not rotated unless the locking member is reversely rotated against the rotational moment. It is difficult to reverse the locking member if the child simply pushes the ordinary rod into the insertion slot from above. The worry that can be opened can be eliminated.

Further, this locking device does not use any coil springs or other springs, and uses the rotational moment generated by gravity acting on the arm portion of the locking member to move the hook portion from the convex portion of the lid receiving frame. Since the locking member is not rotated in the opposite direction and the bent tip of the hook is stopped at the lock position, the spring is corroded like a conventional lock device, and the spring force is reduced due to corrosion. Thus, the disadvantage that the lock is loosened can be completely eliminated.

In particular, when the weight portion is formed at the tip of the arm portion as in the lock device of the second aspect, the rotational moment generated in the locking member is further increased, so that the locking member is less likely to reversely rotate. Thus, the locked state can be maintained more reliably.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing a lock device for a protective cover according to an embodiment of the present invention, FIG. 2 is an enlarged exploded perspective view of a main part of the lock device, and FIG. 3 is a protective cover on which a locking member is mounted. 4 is a perspective view showing a distal end portion of the unlocking tool, FIG. 5 is an explanatory view of the locking device in a locked state, and FIG. 6 is an explanatory view of the locking device in an unlocked state.

In FIG. 1, reference numeral 1 denotes a cover receiving frame provided to surround an inner cover (not shown) for a public box, and 2 denotes a protective cover which is attached to and detached from a cover receiving portion 1a at the upper end of the cover receiving frame 1. The protective cover 2 has a hinge member 3 at one end.
a and 3b are connected to the lid receiving portion 1a so as to be openable and closable. On the back surface of the other end of the protective cover 2, a lock device is provided in which a locking member 4 is rotatably mounted on a shaft.

As shown in FIG. 2, the locking member 4 is
A horizontal cylindrical portion 4a into which a bolt 5 as a support shaft is inserted, and a projecting portion 4b projecting upward from an outer peripheral surface of the horizontal cylindrical portion 4a;
The lower end of the horizontal cylindrical portion 4a is projected from the outer peripheral surface of the horizontal cylindrical portion 4a.
c has at least a hook portion 4c bent sharply forward, and an arm portion 4d protruding rearward from the outer peripheral surface of the horizontal cylinder portion. The locking member 4 in this embodiment includes: In addition to the above, a weight portion 4e is formed at the tip of the arm portion 4d, and further, an abutment portion 4f protrudes obliquely upward and forward from the outer peripheral surface of the horizontal cylindrical portion 4a.

On the other hand, an elongated U-shaped insertion opening 2a for inserting a lock release tool is formed at an end of the protective cover 2, and an L-shaped wall 2b is formed so as to surround the insertion opening 2a.
And a bottom wall 2 c are provided on the back side of the protective lid 2. As shown in FIG. 3, the locking is performed between one bearing 2 d protruding from the back surface of the bottom wall 2 c and the other bearing 2 e protruding from the back of the protective cover 2. Member 4
The locking member 4 is rotatably mounted on the bearings 2d and 2e by means of bolts 5 and nuts 5a inserted as support shafts.

On the inner side of the lid receiving frame 1, a convex portion 1b, from which the tip 41c of the hook portion 4c of the locking member 4 engages from below, is projected obliquely downward.

The insertion slot 2a needs to be formed at a position adjacent to the projection 4b of the locking member 4. If the insertion slot 2a is far away from the projection 4b, the insertion slot 2a will be described later. The locking member 4 does not reach the projection 4b even if the unlocking tool is inserted and turned 90 degrees.
It is impossible to release the lock by rotating.

In the locking device for the protective cover having the above-described configuration, the hook portion 4c is moved to the convex portion of the lid receiving frame 1 by the gravity acting on the arm portion 4d and the weight portion 4e of the locking member 4, as shown in FIG. 1b, the upper surface of the locking portion 4f of the locking member 4 comes into contact with the bottom wall 2c of the protective cover 2 and the tip of the hook 4c. 4c is kept stopped at a position (lock position) where it engages with the projection 1b of the lid receiving frame 1 from below, and the locking member 4 does not rotate backward. Therefore, even if the user tries to open the protective cover 2, the distal end 41 c of the hook portion 4 c engages with the projection 1 b of the lid receiving frame 1 from below, so that the protective cover 2 cannot be opened.

On the other hand, when the protective cover 2 is opened, as shown in FIG. 4, pin portions 6b, 6b are provided on both sides of the distal end portion 6a of the rod.
The T-shaped tip of the unlocking tool 6 is inserted through the insertion opening 2a of the protective cover 2 as shown in FIG. Then, as shown in FIG. 6, the unlocking tool 6 is rotated by about 90 degrees, and the projection 4 b of the locking member 4 is
When the locking member 4 is pushed forward from behind with the pin portion 6b, the hook member 4c reversely rotates in the direction away from the convex portion 1b of the lid receiving frame 1 against the rotational moment M, and the hook member 4c Pivots to a position (unlocked position) where the tip 41c of the second member does not engage the convex portion 1b from below. Therefore, in this state, when the pin portions 6b, 6b of the unlocking device 6 are engaged with the both side edges of the insertion opening 2a of the protective cover 2 from below and the unlocking device 6 is pulled up, the protective cover 2 can be easily opened. it can.

When the protective cover 2 is closed, the pins 6b, 6b of the unlocking tool 6 are inserted into the insertion opening 2a as described above.
The protective cover 2 is placed on the cover receiving portion 1a of the cover receiving frame 1 while being engaged with both side edges of
When the locking member 4 is removed from the insertion opening 2a by rotating the locking portion 4 by the above-described rotational moment M, the hook portion 4c is rotated.
Is stopped automatically at a lock position where the tip 41c of the cover engaging the projection 1b of the lid receiving frame 1 from below is automatically locked.

The weight 4e of the locking member 4 is not indispensable, and the above-described rotational moment M is generated only by the arm 4d. However, when the weight 4e is formed, the rotational moment M becomes large. There is an advantage that the rotation locking operation of the member 4 becomes smooth and locking can be performed more reliably. Further, the locking portion 4f of the locking member 4 is not essential, but if the locking portion 4f is formed, the rotation of the locking member 4 can be stopped and the tip 41c of the hook portion 4c can be reliably positioned at the lock position. There are advantages.

As described above, the lock device for the protective cover is provided with the unlocking tool 6 inserted into the insertion opening 2a of the protective cover 2 as shown in FIG.
Rotate the lock member 4 by 0 degrees so that the protrusion 4b of the locking member 4 becomes a pin 6b.
By pushing the locking member 4 backward from the back against the rotational moment M by pushing the protective cover 2
However, it is difficult to reversely rotate the locking member 4 only by the child inserting the ordinary rod into the insertion slot 2a from above. The worry that the protective cover 2 can be easily opened can be eliminated.

This locking device does not use any coil springs or other springs, and utilizes the rotational moment M generated by gravity acting on the arm 4d and the weight 4e of the locking member 4 to make use of the hook portion 4c. Does not reversely rotate the locking member 4 in a direction away from the convex portion 1b of the lid receiving frame, and stops the bent tip 41c of the hook portion 4c at the lock position. It is possible to completely eliminate the disadvantage that the spring is corroded or the lock is loosened due to the reduction of the spring force due to the corrosion.

In this embodiment, as the unlocking tool, a pin 6 having a triangular cross section is provided on both sides of the tip 6a.
b and 6b are used, but the pin portion 6b
Can have a desired cross-sectional shape such as a circle, a quadrangle, or a polygon, and an unlocking tool having an L-shaped tip with a pin 6b protruding only on one side of the tip 6a can also be used. .

[0029]

As is apparent from the above description, the lock device for the protective cover according to the present invention is a safe device that cannot be easily unlocked simply by pushing in a normal rod-shaped member, and therefore, it is difficult for children to mischief. This eliminates the concern that the protective lid may be opened, and also completely eliminates the drawbacks of the spring, such as the conventional device, in which the spring is corroded and the lock is loosened due to the reduced spring force. Has a remarkable effect.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a lock device for a protective lid according to an embodiment of the present invention.

FIG. 2 is an enlarged exploded perspective view of a main part of the lock device.

FIG. 3 is a partial front view of a protective lid on which a locking member is pivotally mounted.

FIG. 4 is a perspective view showing a tip portion of the unlocking tool.

FIG. 5 is an explanatory view of the lock device in a locked state.

FIG. 6 is an explanatory diagram of the lock device in an unlocked state.

FIG. 7 is a sectional view of a conventional locking device for a protective cover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lid receiving frame 1b Convex part 2 Protective lid 2a Insertion opening 2d, 2e Bearing part 4 Locking member 4a Horizontal cylinder part 4b Projection part 4c Hook part 41c Curved tip 4d Arm part 4e Weight part 4f Stop part 5 Support shaft (bolt) ) 6 Lock release tool 6b Pin part M Rotational moment

Claims (2)

[Claims] 1. A locking device in which a locking member is rotatably mounted on the back surface of an end of a protective cover attached to and detached from a lid receiving frame, wherein the locking member is a horizontal cylinder through which a support shaft is inserted. Part, a protrusion protruding upward from the outer peripheral surface of the horizontal cylinder portion, a hook portion protruding downward from the outer peripheral surface of the horizontal cylinder portion and having a tip bent forward, and It has an arm portion projecting rearward from the outer peripheral surface, and a projection is formed on the inside of the lid receiving frame so that a hook portion of the locking member engages from below. At the end, an insertion opening for inserting the unlocking tool is formed adjacent to the projection of the locking member.
A lock device for a protective cover, characterized in that: 2. The locking device according to claim 1, wherein a weight portion is formed at a tip of the arm portion of the locking member.