JPH1082063A - Cover body lock device of protection cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safe cover body lock device incapable of simply releasing a lock by only forcing a normal bar-shaped body. SOLUTION: In a cover lock device, a projection piece 3a is formed inside a cover holding frame 1 of a protection cover, and a locking arm 3b is borne on an arm bearing section 31 on the rear side of a cover body 2 in a state capable of being oscillated in the approximately horizontal direction. The front end interlocking section 3g of the locking arm 3b is so urged toward a lock position capable of being interlocked from a lock releasing position incapable of being interlocked with the projection piece 3a by an arm urging device that the locking arm 3b is turned in the approximately horizontal direction, and a lock releasing device insertion section 3f is formed in the cover body 2. It is difficult to release a lock by turning the locking arm 3b in the approximately horizontal direction up to the lock releasing position by only forcing a normal bar-shaped body from the lock releasing device insertion section 3f.

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 provided with a cover receiving frame provided to surround an inner cover for a public box, and a cover attached to and detached from the 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 sewer pipe in the ground of a public road near a public-private boundary line. At the upper end of the height-adjusting cylinder, an inner lid for a public basin is attached. Then, a cover receiving frame of a protective cover is provided so as to surround the inner cover for the public square, and a cover is attached to the lid receiving frame to protect the inner lid for the public square. In such a protective lid, it is common to provide a lid locking device so that the lid is not easily opened.

FIG. 10 is an explanatory view exemplifying a lid lock device of a conventional protective lid, wherein 10 is a lid receiving frame, 20 is a lid, and 30 is a lid lock device.

In this lid lock device 30, a horizontal shaft 30b of a lock member 30a is rotatably mounted on a bearing portion 20a on the back surface of the lid 20, and a hole of a bracket 10a protruding from the inner surface of the lid receiving frame 10. 10b, the lower end hook portion 30c of the lock member 30a is inserted and the lock member 30a is inserted.
A compression coil spring 30d is provided between the upper side surface of the cover 20 and the reinforcing rib 20b on the back surface of the lid 20. And
The resilient force of the compression coil spring 30d constantly urges the lock member 30a in the clockwise direction, and the lock member 30a
The lower end hook portion 30c is engaged with the distal end portion of the bracket 10a from below to lock the lid 20 so as not to open.

[0005] In such a lid lock device 30, as shown by a dashed line, the lock release rod 40 is connected to the notch 2 of the lid 20.
0c, the lock member 30a is rotated counterclockwise as shown by a dashed line against the resilience of the compression coil spring 30d, and the lower end hook portion 30c of the lock member 30a and the tip of the bracket 10a are rotated. The engagement with the part is released, and the lid 20 can be opened.

[0006]

However, in the lid locking device 30, the locking member 30a rotates counterclockwise just by pushing a normal rod-shaped member from the notch 20c of the lid 20. Since the engagement between the lower end hook portion 30c of the lock member 30a and the distal end portion of the bracket 10a is released, there is a risk that the child may mischief and open the lid 20.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a safe lid lock device in which the lock is not easily released simply by pushing in an ordinary rod.

[0008]

According to a first aspect of the present invention, there is provided a lid locking device which surrounds an inner cover for a public square, and a lid receiving frame provided around the inner lid. A lid locking device for a protective lid having a lid detachably attached to the lid, wherein the projection is formed on an inner surface of the lid receiving frame and an arm supporting portion formed on a back surface of the lid is substantially horizontal. Arm that is swingably supported in the direction, and the locking arm is moved in a substantially horizontal direction from an unlocked position where the engaging portion at the tip of the arm cannot be engaged with the protruding piece to a locked position where it can be engaged. An arm urging means for urging the arm to rotate is provided, and an unlocking tool insertion portion formed on the lid along the locking arm at the lock position.

According to a second aspect of the present invention, in the above-mentioned lid locking device, the arm urging means in the lid locking device includes:
A weight portion projecting laterally from a rear portion of the locking arm and having a shaft portion at a tip thereof; and a bearing portion formed on the back surface of the lid and having an inclined groove into which the shaft portion at the tip of the weight portion is slidably fitted. The lid locking device according to claim 3, wherein the arm urging means comprises:
It is a compression coil spring stretched between a spring supporting piece formed on the back surface of the lid and a side surface of the locking arm.

In the lid locking device of the first aspect, when the lid is mounted on the lid receiving frame, the locking arm is rotated substantially horizontally to the locked position by the arm urging means, and the lid is opened. In this case, the engaging portion at the tip of the arm is engaged with the projecting piece of the lid receiving frame, so that the lid is not opened. Then, an unlocking tool having an arm holding pin protruding on one or both sides of the tip is inserted from the unlocking tool insertion portion of the lid and rotated by about 90 degrees, and the locking arm is pushed by the arm holding pin. When the arm is rotated substantially horizontally from the locked position to the unlocked position, the engaging portion at the tip of the arm cannot be engaged with the projecting piece, and the lid can be opened.

In this lid lock device, the lid cannot be opened unless the locking arm is rotated substantially horizontally from the lock position to the unlock position as described above.
It is difficult to rotate the locking arm in a substantially horizontal direction only by pushing the ordinary rod-shaped member from above into the unlocking device insertion portion of the lid by mischief. In this way, it is possible to eliminate the fear that the lid is opened due to the mischief of the child.

According to a second aspect of the present invention, when the locking arm is rotated substantially horizontally from the locked position to the unlocked position by the arm push pin at the tip of the unlocking tool, the weight of the locking arm also rotates. The shaft portion at the tip of the weight portion slides obliquely upward in the inclined groove of the bearing portion. When the shaft is slid in this manner, the gravity of the weight causes the shaft to slide down the inclined groove obliquely downward, and the force to slide down causes the locking arm to move the locking arm from the unlocked position to the locked position. It will act as a biasing force to rotate in a substantially horizontal direction. For this reason, when the unlocking tool is removed, the shaft slides down obliquely downward in the inclined groove, and the locking arm pivots substantially horizontally with the weight to return to the locked position and is automatically locked. Become.

According to a third aspect of the present invention, when the locking arm is rotated substantially horizontally from the locked position to the unlocked position by the arm push pin at the tip of the unlocking tool, the compression coil spring rotates the locking arm. When the locking device is further compressed with the movement and the unlocking device is removed, the locking arm is rotated substantially horizontally to the locked position by the elastic force of the compression coil spring and is automatically locked.

[0014]

DETAILED 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 of a protective cover provided with a cover locking device 3 according to an embodiment of the present invention, and FIG. 2 is a perspective view of the device 3 in a locked state viewed through the cover. 3 is a plan view of the device 3 in a locked state as viewed through a lid, FIG. 4 is a front view of the device 3 in a locked state as viewed through a lid receiving frame, and FIG. 5 is a device in an unlocked state as viewed through a lid. FIG. 6 is a front view of the device 3 in an unlocked state as seen through a lid receiving frame.

The protective cover shown in FIG. 1 is a cover receiving frame 1 provided so as to surround an inner cover (not shown) for a public box, and a cover attached to and detached from a cover receiving portion 1a at the upper end of the cover receiving frame 1. The cover 2 has a hinge member 4 at one end.
a and 4b are connected to the lid receiving portion 1a so as to be openable and closable. The other end of the lid 2 is provided with the lid lock device 3 of the present invention.

As shown in FIG. 2, the lid locking device 3 includes a projecting piece 3a formed on the inner surface of the lid receiving portion 1a of the lid receiving frame 1, and a locking arm attached to the back side of the lid 2. 3b, a weight portion 3c, a shaft portion 3d, a bearing portion 3e, which constitutes the urging means of the locking arm, and a lock release tool insertion portion 3f formed on the lid 2.

The locking arm 3b has a concave engaging portion 3g formed at the tip of the arm so as to be vertically engageable with the projecting piece 3a, and a support shaft 3h is formed on the outer surface of the rear portion of the arm. Has been established. The locking arm 3 b is provided with an arm supporting portion 3 protruding from the back surface of the lid 2.
By loosely inserting the support shaft 3h into the bearing hole 3j (the bearing hole having a larger diameter than the support shaft 3h) and supporting the support shaft 3h, the engaging portion 3g at the tip of the arm can be engaged with the protruding piece 3a. It is mounted so that it can swing substantially horizontally between the locked position shown in FIG. 3 and the unlocked position shown in FIG.

A weight 3c is formed integrally with a rear portion of the locking arm 3b so as to protrude in a direction opposite to the support shaft 3h, and a shaft 3d protrudes from a tip of the weight 3c. . The shaft portion 3d is slidably fitted in the inclined groove 3k of the bearing portion 3e protruding from the back surface of the lid 2, and the shaft portion 3d slides down to the lower end of the inclined groove 3k as shown in FIG. 4, the weight 3c is horizontal as shown in FIG. 4 and the locking arm 3b is stopped at the lock position shown in FIG.

The lock releaser insertion portion 3f is formed by cutting the outer peripheral portion of the lid 2 into an elongated U-shape along the locking arm 3b at the lock position. On the back surface of the lid 2 opposite to the locking arm 3b with the lock releaser insertion portion 3f interposed therebetween, a side wall portion bent into an L shape as shown in FIGS. 2 and 3 and reaching the vicinity of the locking arm 3b. 3 m, and the side wall 3 m
The bottom wall 3n of the unlocking tool insertion part 3f is formed from the lower end of the lock release tool insertion part 3f.

FIG. 7 shows an example of a lock release tool inserted into the lock release tool insertion portion 3f. This unlocking tool 5
Are arm holding pins 5b on both sides of the tip 5a of the rod.
The arm holding pin 5b has a triangular cross-sectional shape, but is not limited thereto, and has a desired cross-sectional shape such as a circle, a quadrangle, or a polygon. can do. Further, an unlocking tool having an L-shaped tip shape in which an arm holding pin 5b is protruded only on one side of the tip portion 5a can be used.

In the lid lock device having the above structure, in the locked state, the locking arm 3b is at the lock position shown in FIG. 3, and when the lid 2 is to be opened upward, the engaging portion 3g at the arm tip is turned into the projecting piece 3a. To prevent the lid 2 from opening. In this locked state, the shaft 3d at the tip of the weight 3c is located at the lower end of the inclined groove 3k of the bearing 3e as shown in FIG. 2, and the weight 3c is horizontal as shown in FIG. I have.

In this locked state, the T-shaped tip 5a of the unlocking device 5 is inserted into the unlocking device insertion portion 3f.
When the tip 5a is rotated about 90 degrees as shown in FIGS. 5 and 6, the locking arm 3b is pushed counterclockwise by one of the arm pressing pins 5b, and the support shaft 3h To the unlocked position, and the engaging portion 3g at the tip of the arm cannot be engaged with the protruding piece 3a on the inner surface of the lid receiving frame 1. Therefore, the arm holding pins 5b, When the lock releaser 5 is lifted up by engaging the lock releaser 5 with the side edges of the lock releaser insertion portion 3f from below, the lid 2 can be easily opened.

When the unlocking operation is performed as described above, the weight 3c also moves to the shaft 3d with the rotation of the locking arm 3b.
As a result, the shaft 3d slides obliquely upward in the inclined groove 3k to reach near the upper end of the inclined groove 3k as shown in FIG. 6, and the weight 3c is inclined obliquely. In the state where the shaft 3d is slid to near the upper end of the inclined groove 3k in this manner, the shaft 3d is moved by the gravity of the weight 3c.
The sliding force acts as an urging force for rotating the locking arm 3d substantially horizontally from the unlocked position shown in FIG. 5 to the locked position shown in FIG. Will be. Therefore, when the lid 2 is closed and the unlocking tool 5 is removed, the shaft 3d slides down the inclined groove 3k obliquely downward due to the gravity of the weight 3c, and the locking arm 3b rotates substantially horizontally with the weight 3c. It moves to the lock position shown in FIG. 3 and is automatically locked.

If such an arm urging means utilizing the gravity of the weight portion 3c is employed, there is a problem of corrosion of the compression coil spring 30d as seen in a lid lock device employing a conventional compression coil spring 30d, The problem of the lowering of the urging force can be solved at once, and the locking arm 3b can be urged in a substantially horizontal direction from the unlocked position to the locked position with a substantially constant force. Moreover,
The lid lock device is configured such that a lock release tool 5 having a T-shaped tip (or an L-shaped lock release tip) is inserted into the lock release tool insertion portion 3f of the lid 2 and rotated by about 90 degrees. The lid 2 cannot be opened unless the locking arm 3b is rotated substantially horizontally from the locked position to the unlocked position. Since it is difficult to rotate the locking arm 3b in a substantially horizontal direction just by pushing the locking arm 3b into the insertion portion 3f, it is possible to eliminate the fear that the lid is opened by mischief of a child.

FIG. 8 is a plan view of the lid lock device 3 according to another embodiment of the present invention as seen through the lid, and FIG. 9 is a plan view of the lid lock device 3 as seen through the lid. FIG. 8 shows the locked state, and FIG. 9 shows the unlocked state.

According to the lid locking device 3, a pair of left and right pin receiving portions 3p and 3q are formed on the back surface of the lid 2, and the arm supporting pin 3r is moved from one of the pin receiving portions 3p to the locking arm 3b. Rear pin insertion hole, compression coil spring 3
s, and is inserted into the other pin receiving portion 3q. A retaining nut 3t is screwed into the tip of the arm support pin 3r so as not to come off.

The pin insertion hole formed in the rear part of the locking arm 3b has a hole diameter which is considerably larger than the diameter of the arm support pin 3r. Since the arm support pin 3r is loosely loosely inserted, the locking arm 3b is , At least between the locked position shown in FIG. 8 and the unlocked position shown in FIG. 9 in a substantially horizontal direction.

The compression coil spring 3s, which is a biasing means for the locking arm 3b, is provided with an arm support pin 3r.
Is compressed and stretched between the pin receiving portion 3q on the unlocking position side and the rear side surface of the locking arm 3b, and the pin receiving portion 3q is also used as a spring support. When the compression coil spring 3s is stretched in this way,
There is an advantage that the compression coil spring 3s can be prevented from falling off, and there is an advantage that the urging force of the locking arm 3b can be easily adjusted by changing the length, wire diameter, coil diameter and the like of the compression coil spring 3. Needless to say, a spring support may be separately formed on the back surface of the lid 2, and the compression coil spring 3s may be stretched between the spring support and the side surface of the locking arm 3b.

Other configurations are substantially the same as those of the lid locking device of the above-described embodiment. Therefore, in FIGS. 8 and 9, the same members are denoted by the same reference numerals, and description thereof will be omitted.

In the lid lock device having the above structure, in a normal state, the locking arm 3b is pressed by one of the pin receiving portions 3p by the elastic force of the compression coil spring 3s to be in the locked position as shown in FIG. When the body 2 is to be opened upward, the engaging portion 3g at the tip of the arm becomes the protruding piece 3a of the lid receiving frame 1.
To prevent the lid 2 from opening.

In this locked state, the T-shaped tip 5a of the unlocking tool 5 is inserted into the unlocking tool insertion portion 3f.
When the tip 5a is rotated by about 90 degrees as shown in FIG. 9, the locking arm 3b is pushed counterclockwise by one of the arm holding pins 5b to further compress the compression coil spring 3s. The arm 3 is rotated substantially horizontally around the rear end of the arm to the unlock position, and the engaging portion 3g at the tip of the arm cannot engage with the protrusion 3a on the inner surface of the lid receiving frame 1. Arm holding pin 5
When the lock releaser 5 is lifted by engaging the b and 5b with both side edges of the lock releaser insertion portion 3f from below, the lid 2 can be easily opened.

When the lid 2 is closed and the unlocking tool 5 is removed, the locking arm 3b is moved from the unlocked position shown in FIG.
Is rotated horizontally to the lock position shown in FIG.

In the lid lock device of this embodiment, the compression coil spring 3s is employed as the urging means of the locking arm 3b, so that the problem of corrosion of the coil spring and a decrease in the urging force remains, but the child may mischief. It is difficult to rotate the locking arm 3b from the locked position to the unlocked position in a substantially horizontal direction only by pushing the ordinary rod-shaped body from above into the unlocking device insertion portion 3f of the lid 2. The object of the present invention of preventing the lid from being easily opened by children's mischief is sufficiently achieved.

In place of the compression coil spring 3s, other springs such as a leaf spring and a tension coil spring can be used as the arm urging means.

[0036]

As is clear from the above description, the lock device for the protective cover according to the first aspect of the present invention is a device in which a child mischiefs and inserts an ordinary rod into the lock release tool insertion portion of the cover. You can lock it so that the lid does not open even if you push it in,
If a T-shaped or L-shaped unlocking tool is used at the tip, the lock can be easily unlocked and the lid can be opened.

In the lid locking device according to the second aspect of the present invention, there is no concern that the arm urging means is corroded or the urging force is reduced, and the locking arm is moved toward the lock position with a substantially constant force. The lid locking device according to claim 3 of the present invention has an effect that the urging force of the locking arm can be easily adjusted.

[Brief description of the drawings]

FIG. 1 is a sectional view of a protective lid provided with a lid locking device according to an embodiment of the present invention.

FIG. 2 is a perspective view of the lid locking device in a locked state viewed through the lid.

FIG. 3 is a plan view of the lid locking device in a locked state viewed through the lid.

FIG. 4 is a front view of the lid locking device in a locked state as seen through a lid receiving frame.

FIG. 5 is a plan view of the lid locking device in an unlocked state as seen through the lid.

FIG. 6 is a front view of the lid locking device in an unlocked state as seen through a lid receiving frame.

FIG. 7 is a partial perspective view showing an example of a lock release tool.

FIG. 8 is a plan view of a lid locking device in a locked state according to another embodiment of the present invention as seen through a lid.

FIG. 9 is a plan view of the lid locking device in an unlocked state as seen through the lid.

FIG. 10 is an explanatory view of a conventional lid lock device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lid receiving frame 2 Lid 3 Lid locking device 3a Protrusion piece 3b Locking arm 3c Weight 3d Shaft at tip of weight 3e Bearing 3f Lock insertion part insertion part 3g Engagement part at arm tip 3h Support shaft 3i Arm Support portion 3k Inclined groove 3q Spring support (pin receiving portion) 3r Arm support pin 3s Compression coil spring 4a, 4b Hinge member 5 Lock release tool 5a Tip end of lock release tool 5b Arm holding pin

Claims (3)

[Claims] 1. A lock device for a protective cover, comprising: a cover receiving frame provided to surround an inner cover for a public box; and a lid detachably attached to the cover receiving frame. A protruding piece formed on the inner surface of the arm, a locking arm swingably supported in a substantially horizontal direction by an arm supporting portion formed on the back surface of the lid, and an engaging portion at an arm tip of the locking arm. Arm urging means for urging the protruding piece to rotate substantially horizontally from a lock release position where it cannot be engaged with the protruding piece to a lock position where it can be engaged, and a lid along the locking arm at the lock position And a lock releasing device insertion portion formed in the protective cover. An arm urging means comprising: a weight portion projecting laterally from a rear portion of the locking arm and having a shaft portion at a tip end;
2. The lid locking device according to claim 1, further comprising a bearing formed on the back surface of the lid and having an inclined groove into which the shaft at the tip of the weight is slidably fitted. 3. The device according to claim 1, wherein the arm biasing means is a compression coil spring stretched between a spring supporting piece formed on the back surface of the lid and a side surface of the locking arm. Lid lock device.