JP2002004316A - Recessed section covering device having hook receiving bar for hanging manhole lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cover device which prevents outsiders from opening a manhole lid without good reasons by covering the recessed section of the manhole lid and a supporting bar provided in the recessed section. SOLUTION: A recessed section covering device is provided with a cover plate 1 which covers the recessed section A1 and a leg 3 which is inserted into the recessed section A1 on the lower surface of the plate 1 and a vertical locking shaft 4 which is rotatably passed through the cover plate 1 in a state where the shaft 4 does not move in the axial direction. A locking arm 6 is screwed on a threaded bar 5 below the locking shaft 4 and is positioned in the recessed section A1 so that the arm 6 may be engaged with and disengaged from the supporting bar A2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a manhole cover and the like, in which a hanging-like receiving rod for suspending and lifting the manhole cover is provided in a part thereof, and covers the receiving rod portion. About things.

[0002]

2. Description of the Related Art Conventionally, in a manhole cover of this type, at least one is provided on a disc-shaped or rectangular manhole cover, and four are provided near four corners in a case of a normal rectangle, respectively (see FIG. 8). ). In this shape, a semicylindrical recessed portion A is provided from the surface of the manhole cover A, the both side walls A1 are parallel inner wall surfaces A3, and a receiving rod A2 is attached at a substantially axial position in a transverse direction. . Therefore, in order to open the manhole cover A, a man-powered tool or a hanging hook is engaged with the receiving rod A2 to lift and open the cover (see FIG. 5). However, since the receiving rod A2 is exposed to the outside, an outsider may hook the receiving rod A2 by malicious or mischief and open the lid without permission of the administrator.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to attach a cover plate which is not removed in the recess so that the manhole cover cannot be opened without permission by an outsider as described above. The receiving rod A2 itself is made invisible to an outsider, and the cover plate cannot be easily removed by an outsider. On the other hand, the cover plate can be easily removed by an administrator by using a specific tool. An object of the present invention is to provide a cover device which can be removed and a manhole cover can be opened as in the conventional case.

[0004]

Means for Solving the Problems In order to achieve the above-mentioned object, in the concave portion cover device having a hook receiving bar for hanging a manhole cover according to the present invention, a hook receiving bar A2 for hanging a manhole cover A is provided. On the lower surface 2 of the cover plate 1 having a sufficient plane area to cover the provided recess A1, a leg 3 made of a protrusion or a thick portion that can be inserted into the inner surface A3 on both side walls of the recess A1 is provided. The lock plate 4 is provided on the cover plate 1 so as to be rotatable in the axial direction so as to be non-movable in the axial direction through the cover cover plate 1 at a position deviating from the receiving rod position. The protruding shaft part is a screw rod part 5, and the screw rod part 5 has the receiving rod A2.
A base 7 of a lock arm 6 that can be hooked is screwed to the lower side of the lock plate 4. The upper end of the lock shaft 4 is substantially flush with the surface of the cover plate 1, and is a flat non-circular handle engagement protrusion 8. The rotation of the lock shaft 4 causes a part of the lock arm 6 to move from a part of the leg piece 3 to the inner wall surface A3 of the recess A1.
, The tip of the lock arm 6 can be engaged with the receiving rod A2 in a phase or direction in which the tip of the locking arm 6 engages with the receiving rod A2.
On the other hand, when the lock shaft 4 is rotated in the opposite direction, the lock arm 6 rotates by 90 ° until the lock arm 4 comes off the receiving rod A2.
It can rotate with the lock shaft 4.

Further, in order to achieve the above-mentioned object, the position of the lock shaft 4 of the concave portion cover device having the hook receiving bar for hanging the manhole cover is provided so as to be deviated in the width direction of the cover plate. Preferably, there is.

In order to achieve the above object, a leg 3 of the cover plate 1 of the recessed portion cover device having a hook receiving bar for hanging the manhole cover engages the lock shaft 4 with a lock arm 6. When the lock arm 4 is turned in the direction in which the lock arm 6 is controlled to be engaged with the receiving rod A2, the lock arm 4 is turned in a direction to remove the lock shaft 4 from the receiving rod A2. It is preferable that a space is formed that does not come into contact with the leg pieces 3 until the arm 6 rotates by α = 90 °.

[0007]

According to the first aspect of the present invention, the handle is engaged with the engaging projection 8 at the upper end, and the handle is turned to rotate the lock arm 6 screwed to the threaded rod portion 5 of the lock shaft 4. The screw rod 5 is lowered to the lowermost end. Then, the lock arm 6 is inserted under the receiving rod A2, and the leg piece 3 is fitted into the recess A1. Next, the engaging recess H1 of the handle H is fitted into the engaging projection 8, and the lock shaft 4 is rotated.
Rotates together with the lock shaft 4 and is in a posture perpendicular to the receiving shaft A2, a part of which abuts on a part of the leg piece 3 or a part of the recessed portion A1, and then the lock shaft 4 is locked even if it is rotated. The arm 6 does not rotate, and the feed of the screw bar 5 raises the lock arm 6 while maintaining its posture, and engages with the lower side of the receiving rod A2. If the lock shaft 4 is further turned by the handle, the lock arm 6
Is pressed against the receiving rod A2, and by this reaction, the cover plate 1 is pressed against the surface of the manhole cover A, and acts to fix it to the manhole cover A. Therefore, unless the lock shaft 4 is reversed, the cover plate 1 does not move, and the receiving rod A2 is covered with the cover 1, so that the presence of the receiving rod A2 itself is normally maintained in a hidden state.

Next, when the manhole cover A is opened by the administrator, the handle 10 having a dent just fitted with the hooking projection 8.
When the lock shaft 4 is reversed by the handle 10, the locking of the lock arm 6 is loosened, and when the lock shaft 4 is further turned, the lock arm 6 moves together with the lock shaft 9 to 9.
When the lock arm 6 is turned by 0 °, the lock arm 6 is released from the receiving rod A2, and the cover plate 1 is ready to be removed from the manhole cover A. Then, the cover plate 1 is removed from the manhole cover A, and thereafter the cover plate 1 can be opened by using the receiving rod A2 of the manhole cover A as in the related art.

According to the second aspect of the present invention, since the position of the lock shaft 4 is provided unevenly in the width direction of the cover plate 1, it is not necessary to particularly provide the cover plate 1 with the leg 3 against which the lock arm 6 contacts. It is easy to keep the lock arm 6 in a posture in which it comes into contact with the inner wall surface A3 of the concave portion A1 and engages with the receiving rod A2. Further, the length of the lock arm 6 can be increased, and the engagement with the receiving rod A2 becomes sufficient. When these are engaged, the cover plate 1 does not easily come off, and the original function of the cover 1 is sufficiently exhibited.

According to the third aspect of the present invention, the posture in which the lock arm 4 engages with the receiving rod A2 of the lock shaft 4, that is, the direction in which the length of the concave portion A1 is oriented in the length direction, is the leg piece 3 integrated with the cover plate 1. The cover plate 1 is recessed A1
Even if the position is moved in the width direction, it will always be constant,
There is no risk of poor engagement.

[0011]

[First Embodiment] FIGS. 1 to 3
This is an embodiment including the inventions described in claims 1 and 3. 1 to 3, reference numeral 1 denotes a cover plate, which is usually made of die-cast metal, and has a lower surface 2 which can be inserted into the concave portion A1 and has a concave portion A.
On both inner wall surfaces A3, two plate-shaped leg pieces 3 are provided at one end side, avoiding the position of the receiving rod A2, and the other end side is provided only on one side.

On the side where only one leg piece 3 is located on one side,
A shaft hole is provided through the thick portion 3b of the cover plate 1,
The lock shaft 4 has a jaw 11 and a rubber O-ring 1 in the axial direction.
2 is provided so as to be rotatable with respect to the cover plate 1 around its axis, and is provided as a threaded rod portion 5 below the lock shaft 4, and a base 7 of a lock arm 6 is screwed into this portion. Let me do it. The upper end of the lock shaft 4 has a non-circular handle engaging projection 8, which is substantially flush with the surface of the cover plate 1. A stopper 9 is screwed into the lower end of the lock shaft 4. When the lock arm 6 rotates the lock shaft 4 and makes its direction parallel to the width direction of the cover plate 1, that is, the axis direction of the receiving rod A2, the locking arm 6 does not hit the receiving rod A2 and all the leg pieces Reference numeral 3 is inserted into the recess A1, and the entire periphery of the cover plate 1 contacts the surface of the manhole cover A.

When the lock shaft 4 is rotated by the handle H having the engagement recess H1 which can be fitted into the engagement projection 8 at the upper end of the lock shaft 4, the lock arm 6 screwed to the threaded rod portion 5 also rotates. , The tip of the lock arm 6 is inserted below the receiving rod A2, and the side surface of the lock arm 6 is
And its rotation is prevented. When the lock shaft 4 is further rotated, the lock arm 6 is lifted upward by the feeding effect of the screw rod portion 5 and pressed against the lower side of the receiving rod A2. And the whole device is fixed in a state of covering the recessed portion A1. In this state, the cover device is fixed to the manhole cover by the three leg pieces 3 and the lock arm 6, and even if the cover plate is pushed in the horizontal direction,
Hits the inner surface of the recess A2, and the entire cover does not come off the manhole cover A.

[Second Embodiment] FIGS. 5 and 6 show the same components and the same parts as those in the first embodiment. This is an embodiment of the invention described in claim 1 or 2. The leg pieces 3a are all short leg pieces 3.
The lock arm 6 does not contact the leg piece 3a. In the drawing, the short leg 3a is formed by a pair of left and right sides, and a portion receiving the lock shaft 4 is formed by a thick portion 3b. Further, the lock shaft 4 is provided further eccentrically as viewed in a plane than in the first embodiment, and when the lock arm 6 is inserted below the receiving rod A2, the side surface of the lock arm 6 is formed inside the recess A2. It comes into direct contact with the wall surface A3.
Therefore, the length of the lock arm 6 is larger as the position of the lock arm 6 is larger than that of the first embodiment of the lock shaft 4 (see FIG. 5).

Therefore, in the second embodiment, the thick portion 3
Since the leg pieces 3a including the right and left b are located in the right and left directions, even if the length is not so long, they are securely fitted to the recess A1, the length of the lock arm 6 can be increased, and the engagement with the receiving rod A2 is deep. Once engaged, the cover plate 1 has a function that makes it harder to come off the manhole cover A. In addition, since the leg piece 3a itself can be short, a small amount of material can be used. In other embodiments, a coil spring 13 wound around the threaded rod portion 5 may be provided between the lock arm 6 and the stopper 9 to stabilize the lock arm 6 (see FIG. 6).

[0016]

In the cover device according to the first aspect of the present invention, when the present cover device is attached to the manhole cover A, the receiving rod A2 is completely covered and hidden, and the presence of the receiving rod A2 itself is recognized from the outside. They can't do things and don't cause mischief. Further, even if the manhole cover is illegally opened, the cover device is firmly attached to the manhole cover and cannot be removed. Further, since the engaging projection 8 at the upper end of the lock shaft 4 is a non-circular projection, a driver or the like cannot be used, and since the projection is provided flush with the upper surface of the manhole cover, the projection cannot be sandwiched by pliers or the like. It has an effect that can prevent the act.

In the invention according to claim 2, claim 1 is
In addition to the above effects of the present invention, since the position of the lock shaft 4 is provided so as to be unevenly distributed in the width direction, the length of the lock arm 6 is increased, and an effect of ensuring engagement with the receiving rod A2 is exerted. According to the third aspect of the present invention, in addition to the effects of the other aspects of the present invention, one of the leg pieces 3 provided integrally with the cover plate 1 even if the size of the concave portion A1 is slightly varied. Since the movable range of the lock arm 6 is restricted by this, the direction of the lock arm 6 at the time of locking becomes constant, and the receiving rod A2
Is always reliable.

[Brief description of the drawings]

FIG. 1 is a partially longitudinal side view showing a state in which a cover device of the present invention is fixed to a concave portion of a manhole cover.

FIG. 2 is a plan view of the first embodiment of the present invention.

FIG. 3 is a lower perspective view of the embodiment of FIG. 2;

FIG. 4 is a divided perspective view of a lock shaft and a lock arm portion.

FIG. 5 is a bottom view of the second embodiment of the present invention.

FIG. 6 is a side view of the embodiment of FIG.

FIG. 7 is a partially longitudinal side view and a bottom view of the operation handle used in the embodiment.

FIG. 8 is a perspective view of a manhole cover.

[Explanation of symbols]

 A Manhole cover A1 Depressed portion A2 Receiving rod H Handle H1 Engaging recess 1 Cover plate 2 Bottom surface 3 Leg 3a Leg 3b Leg 4 Lock shaft 5 Screw bar 6 Lock arm 7 Base 8 Engagement protrusion 9 Stopper 10 Inner surface 11 Flange 12 O-ring 13 Spring

Claims (3)

[Claims] 1. A lower surface 2 of a cover plate 1 having a flat area sufficient to cover a concave portion A1 provided with a hook receiving rod A2 for hanging a manhole cover A, an inner surface A3 on both side walls of the concave portion A1. A leg piece 3 composed of a protrusion or a thick portion that can be inserted is provided, and a lock shaft 4 extends in the axial direction through the cover plate 1 at a position deviating from the receiving rod position on the cover plate 1. A shaft protruding below the lock shaft 4 is provided as a screw rod 5 and a lock arm 6 which can be engaged with the lower side of the receiving rod A2. The upper end of the lock shaft 4 is substantially flush with the surface of the cover plate 1 and is a flat non-circular handle engaging projection 8, and the lock shaft 4 is locked by rotation of the lock shaft 4. A part of the arm 6 is a part of the leg piece 3 or a concave portion A1. When a part of the inner wall surface A3 comes into contact with the receiving rod A2 in a phase or direction in which the tip of the lock arm 6 engages with the receiving rod A2, while the lock shaft 4 is rotated in the opposite direction. , Lock arm 6 is 90
Rotate the lock shaft 4 until it comes off the receiving rod A2.
A recess cover device having a hook receiving bar for hanging a manhole cover, wherein the recess cover device is rotatable together with the cover. 2. The lock shaft 4 according to claim 1, wherein the position of the lock shaft is offset in the width direction of the cover plate.
A recessed cover device having a hook receiving bar for hanging a manhole cover as described in the above. 3. The leg piece 3 of the cover plate 1 has a leg piece 3 for controlling the lock arm 4 to be engaged with the receiving rod A2 when the lock shaft 4 is rotated in the engaging direction. On the other hand, when the lock shaft 4 is turned in a direction to remove the lock shaft 4 from the receiving rod A2, there is formed a space which does not come into contact with the leg pieces 3 until the lock shaft 4 and the lock arm 6 turn 90 °. 2. The concave portion cover device having a hook receiving rod for hanging a manhole cover according to claim 1.