JP2006161423A - Manhole cover opening device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manhole cover opening device which can lift a manhole cover and then displace the same sideways by spending only a little manpower, to thereby improve the workability thereof. <P>SOLUTION: According to the structure of the manhole cover opening device, an inclined lever 9 has its front end fixed to an upper portion of a caster support plate 17 on which casters 16 are mounted, and a T-shaped lifting projection 18 is formed at the front end of the lever 9 so as to project forward from the caster support plate 17, followed by rotatably attaching a hooked lifting projection 21 to an upper portion of the front end of the lever 9. Further a prying portion 3 is formed at a rear end of the lever 9. Then the T-shaped lifting projection 18 or the hooked lifting projection 21 is inserted into a lifting hole 7A or 7B formed in the manhole cover 6A or 6B, and the lever 9 is pressed down, to thereby lift the manhole cover 6A or 6B with the caster 16 as a rotation fulcrum, based on the leverage. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to an improvement of a manhole cover opening device.

When regularly checking the sewers buried underground, the manhole cover is opened and the manhole is entered from here to check the sewer. When opening the manhole cover, conventionally, an open / close jig having a hook attached to the lower end of the shaft (Patent Document 1) or a T-shaped pulling protrusion 2 is formed on the lower end of the shaft 1 as shown in FIG. A manhole cover opening device 5 in which a truncated pyramid-shaped peg opening portion 3 is formed at the end and a handle 4 is attached in a cross shape in the middle is used.

The manhole cover 6A is formed in a disc shape with a casting, and on the outer periphery thereof, one pull-up hole 7A having a plane U shape and two trigger holes 8 and 8 having a plane U shape are formed at intervals of 120 degrees. Yes. As shown in FIG. 11, a hook-shaped stopper 10 is rotatably attached to the inside of the pulling hole 7 </ b> A having a planar U shape, and is engaged with a locking portion 12 formed inside the ring-shaped outer frame 11. In combination, it will not come off.

When opening the manhole cover 6 using the manhole cover opener 5, first, the manhole cover opener 5 is inverted, and the peg opening portion 3 is inserted into the two peripheral holes 8 and 8 so that the manhole cover 6 is slightly lifted. The earth and sand clogged between the ring-shaped outer frame 11 and the manhole cover 6 are dropped.

Next, as shown in FIG. 11, when the T-shaped pulling protrusion 2 is inserted into the pulling hole 7A, the stopper 10 attached thereto is pushed and rotated, and the stopper 10 is locked as shown in FIG. Depart from part 12. Thereafter, when the lever 9 is rotated 90 degrees laterally, the T-shaped pulling protrusion 2 is engaged with the bottom surface of the pulling hole 7A. Next, the manhole cover 6 is pulled up from the ring-shaped outer frame 11 by holding the handle 4 with both hands, and then shifted laterally and removed.

However, in the conventional manhole cover opening device 5, the handle 4 is held by both hands and the heavy manhole cover 6 is pulled up.
JP2002-138504

The present invention improves the above problems and provides a manhole cover opening device that improves the workability by pulling the manhole cover with a small effort and shifting it to the side.

In the manhole cover opening device according to claim 1 of the present invention, the tip end side of the lever is fixed to the upper portion of the caster support plate to which the caster is attached, and the T-shaped or hook-shaped lifting projection is caster-supported at the tip of the lever. It is formed to project forward from the plate, and at the rear end of the lever, a knurling part is formed, the lifting projection is inserted into a lifting hole formed in the manhole cover, and the caster is rotated by pushing down the lever. As a fulcrum, the manhole cover is lifted by the action of a lever.

In the manhole cover opening device according to claim 2 of the present invention, the tip end side of the lever is fixed to the upper part of the caster support plate to which the casters are attached, and the T-shaped pulling projection is forward from the caster support plate to the tip of the lever. The hook-shaped lifting projection is pivotably attached to the upper end of the lever, and a peg opening is formed at the rear end of the lever to form the T-shaped or hook-shaped lifting projection. Is inserted into a pull-up hole formed in the manhole cover, and the manhole cover is lifted up by the action of the lever using the caster as a rotation fulcrum by pushing down the lever.

The manhole cover opening device according to claim 3 of the present invention is such that the tip end side of the lever is fixed to the upper part of the caster support plate to which the casters are attached, and an arm is projected obliquely upward at the tip of the lever. A T-shaped lifting protrusion and a hook-shaped lifting protrusion are pivotally attached to the front end side, and a pry opening is formed at the rear end of the lever. The T-shaped or hook-shaped lifting protrusion is a manhole. The manhole cover is lifted by the action of a lever by inserting into a pull-up hole formed in the cover and pushing the lever down to use the caster as a pivot.

According to the manhole cover opening device of the first aspect of the present invention, the pulling projection is inserted into the pulling hole formed in the manhole cover, and the lever is pushed down to use the caster as a pivotal fulcrum. The manhole cover can be pulled up by force, and when the lever is pulled in the lateral direction, the manhole cover can be easily removed from the outer frame by shifting the manhole cover in the lateral direction by a caster.

Further, according to the manhole cover opening device of the second aspect, the T-shaped lifting projection and the hook-shaped lifting projection can be rotatably mounted on the T-shaped lifting projection, and can be selected according to the structure of the lifting hole of the manhole lid. One unit can open two types of manhole covers.

Further, according to the manhole cover opening device of claim 3, an arm is protruded obliquely upward at the tip of the lever, and a T-shaped lifting projection and a hook-shaped lifting projection are attached to the arm so as to be rotatable, Since it can be selected according to the structure of the pull-up hole of the manhole cover, two types of manhole covers can be opened by one unit, and it can be pulled out in the horizontal direction because it is pulled up by the arm.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. In FIG. 1, reference numeral 15 denotes a manhole cover opening device, which fixes the tip end side of the inclined lever 9 on the upper part of the caster support plate 17 to which two casters 16 are attached, and casters on the tip end side of the lever 9 A block-shaped support protrusion 19 is provided to project downward from a portion protruding forward from the support plate 17, and a T-shaped pulling protrusion 18 is formed in front of this, and a truncated pyramid is formed at the rear end of the lever 9. In this embodiment, a peg opening portion 3 is formed, and a handle 4 is attached in the shape of a cross in the middle of the lever 9.

The method of using the manhole cover opening device 15 having the above-described structure will be described. First, the manhole cover opening device 15 is reversed, and the peg opening portion 3 is inserted into the two raising holes 8 and 8 around the manhole cover 6A shown in FIG. The manhole cover 6A is lifted slightly so as to drop the clogged soil between the ring-shaped outer frame 11 and the manhole cover 6A.

Next, when the T-shaped pulling projection 2 is inserted into the pulling hole 7A as shown in FIG. 11, the stopper 10 attached thereto is pushed and rotated, and as shown in FIG. Deviate from 12. Thereafter, as shown in FIG. 2, when the manhole cover opening device 15 is rotated 90 degrees horizontally, the T-shaped pulling protrusion 18 is engaged with the horizontal bottom surface of the pulling hole 7 </ b> A, and the support protrusion 19 is connected to the road surface 20. Contact.

Next, when the lever 9 is pushed down, the support protrusion 19 serves as a fulcrum, and the manhole cover 6 is slightly lifted with a slight force by the action of the lever. When the lever 9 is further pushed down, the caster 16 comes into contact with the road surface 20 as shown in FIG. 3 and the support protrusion 19 is separated. The caster 16 serves as a fulcrum, and the manhole cover is applied with a slight force by the action of the lever. 6A is pulled up. Thereafter, when the lever 9 is pulled in the lateral direction, the caster 16 can easily shift the lateral direction and remove the manhole cover 6A from the outer frame 11.

In addition, although the case where the support protrusion 19 was attached was shown in the said description, since the caster 16 becomes a fulcrum, even if it has a structure without the support protrusion 19, it can pull up. When the support protrusion 19 is present, the ratio of the distance from the fulcrum to the point of action and the distance from the fulcrum to the point of action, that is, the lever ratio is increased at the time of the first pulling in which the greatest force is required. Therefore, the work becomes easier.

4 and 5 show another embodiment of the present invention, which fixes the tip end side of an inclined lever 9 to the upper part of a caster support plate 17 to which two casters 16 are attached. 9 is provided with a hook-like pulling projection 21 at a portion projecting forward from the caster support plate 17 on the front end side, and a truncated pyramid-shaped peg opening portion 3 is formed at the rear end of the lever 9. The handle 4 is attached in a cross shape.

As shown in FIG. 5, the manhole cover opening device 15 having the above-described structure has a pull-up hole 7 </ b> B formed in a U-shaped section, and an L-shaped stopper 10 is integrally formed at the lower portion thereof, which is formed inside the ring-shaped outer frame 11. This is used when the manhole cover 6B having a structure engaged with the provided L-shaped locking portion 12 is removed.

Next, how to use the manhole cover opening device 15 configured as described above will be described. When the hook-shaped pulling protrusion 21 is inserted into the pulling hole 7B formed in the U-shaped section of the manhole cover opening device 15 and the lever 9 is lowered. The caster 16 contacts the road surface 20, and the caster 16 serves as a fulcrum, and the manhole cover 6B is pulled up with a small force by the action of the lever. Thereafter, when the lever 9 is pulled in the horizontal direction while holding the handle 4, the manhole cover 6 </ b> B can be easily removed from the outer frame 11 by being displaced in the horizontal direction by the casters 16.

6 and 7 show another embodiment of the present invention, which fixes the tip end side of the inclined lever 9 to the upper part of a caster support plate 17 to which two casters 16 are attached. A T-shaped lifting projection 18 is formed at the front end of the lever 9 so as to protrude forward from the caster support plate 17, and a hook-shaped lifting projection 21 is rotatably attached to the upper end of the lever 9 by a support shaft 22. It is a thing.

In the state shown in FIG. 6, as shown in FIGS. 2 and 3, after inserting the T-shaped pulling protrusion 18 into the flat U-shaped pulling hole 7 </ b> A of the manhole cover 6 </ b> A, the manhole cover opening device 15 is rotated 90 degrees laterally. When the lever 9 is pushed down, the caster 16 serves as a fulcrum, and the manhole cover 6A can be pulled up with a small force by the action of the lever.

When the manhole cover 6B is opened, the hook-shaped pulling protrusion 21 shown in FIG. 7 is rotated forward to project the T-shaped pulling protrusion 18 forward. In this state, similarly to FIG. 5, the hook-shaped pulling projection 21 is inserted into the pulling hole 7B formed in the U-shaped section of the manhole cover 6B, and the lever 9 is lowered to serve as a fulcrum. Thus, the manhole cover 6B can be pulled up with a small force by the action of the lever. Accordingly, two types of manhole covers 6A and 6B can be opened with one manhole cover opener 15.

FIGS. 8 and 9 show another embodiment of the present invention, in which the tip end side of the inclined lever 9 is fixed to the upper part of a caster support plate 17 to which two casters 16 are attached. An arm 23 protrudes obliquely upward from the tip of 9, a T-shaped pulling protrusion 18 is provided on the tip of the arm 23, and a hook-shaped pulling protrusion 21 is further pivoted by a support shaft 22 above the arm 23. It is what I supported.

When the manhole cover 6A is opened, the state shown in FIG. 8 is set, and the T-shaped pulling projection 18 suspended from the arm 23 is formed in the plane U shape of the manhole cover 6A as shown in FIGS. When the manhole cover opening device 15 is rotated 90 degrees laterally after being manually inserted into the pulling hole 7A and then the lever 9 is pushed down, the caster 16 serves as a fulcrum, and the manhole cover 6A is raised with a small force by the action of the lever. Can be raised.

Further, when the manhole cover 6B is opened, the hook-shaped lifting projection 21 is rotated forward as shown in FIG. 9 so as to be suspended in front of the T-shaped lifting projection 18. Next, the caster 16 becomes a fulcrum by lowering the lever 9 after holding the hook-like lifting projection 21 by hand and inserting it into the lifting hole 7B formed in the U-shaped section of the manhole cover 6B. The manhole cover 6B can be pulled up with a small force by the action of the lever, and it is easy to pull it out laterally by the caster 16. Therefore, the two manhole covers 6A and 6B can be opened by one manhole cover opener 15 and are pulled up by the arm 23 so that it can be easily pulled out in the lateral direction.

In the above description, the lever 9 is tilted and attached to the caster support plate 17 and the manhole lids 6A and 6B are easily lifted by applying the weight by lever action. The structure attached to may be sufficient. Further, the number of casters 16 is not limited to two, and may be one. Further, the caster 16 is not limited to one fixed in one direction, but may be a structure that rotates, or may be a ball that can rotate in any direction.

In the above description, the case where the manhole cover of the sewer is opened has been shown. However, the present invention can be widely used when the manhole cover of the power cable or communication cable buried in the ground or the cover attached to the rainwater fence is opened.

1 is a perspective view of a manhole cover opening device according to an embodiment of the present invention. It is sectional drawing which shows the state which inserted the T-shaped raising projection part of the manhole cover opening device of FIG. 1 in the raising hole of the manhole cover. It is sectional drawing which shows the state which has pushed down the lever and pulled up the manhole cover. It is a perspective view of the manhole cover opening device by other embodiment of this invention. It is sectional drawing which shows the state which inserted the hook-shaped raising projection part of the manhole cover opening device of FIG. 4 in the raising hole of the manhole cover. It is a perspective view of the manhole cover opening device by other embodiment of this invention. It is a perspective view of the manhole cover opening device in the case of using the hook-shaped pulling projection part shown in FIG. It is a side view of the manhole cover opening device by other embodiment of this invention. It is a side view of the manhole cover opening device in the case of using the hook-shaped pulling projection shown in FIG. It is a perspective view which shows the conventional manhole cover opener. It is sectional drawing which shows the state which inserts the conventional manhole cover opener in the pull-up hole of a manhole cover. It is sectional drawing which shows the state which inserted the manhole cover opening device of FIG. 11 in the pull-up hole of the manhole cover, and released the lock | rock.

Explanation of symbols

1 Shaft
2 T-shaped pulling projection
3 Opening part
4 Handle
5 Manhole cover opener
6A, 6B Manhole cover
7A, 7B Pull-up hole
8 Cause hole
9 Lever
10 Stopper
11 Ring-shaped outer frame
12 Locking part
15 Manhole cover opener
16 casters
17 Caster support plate
18 T-shaped pulling projection
19 Support protrusion
20 road surface
21 Hook-like lifting projection
22 Support shaft
23 Arm

Claims (3)

The tip of the lever is fixed to the upper part of the caster support plate to which the casters are attached, and a T-shaped or hook-like lifting projection is formed to protrude forward from the caster support plate at the tip of the lever. At the rear end, a pry opening is formed, the lifting projection is inserted into a lifting hole formed in the manhole cover, and the lever is pushed down to use the caster as a pivot and lift the manhole cover by the lever action. Manhole cover opener characterized by that. The tip of the lever is fixed to the upper part of the caster support plate to which the casters are attached, and a T-shaped lifting protrusion is formed on the tip of the lever so as to protrude forward from the caster support plate. A hook-like lifting projection is pivotally attached, a peg opening is formed at the rear end of the lever, and the T-shaped or hook-like lifting projection is inserted into a lifting hole formed in a manhole cover, A manhole cover opening device characterized in that the manhole cover is lifted by lever action with the caster as a pivot point by pushing down the lever. The top end of the lever is fixed to the upper part of the caster support plate to which the caster is attached, and an arm is projected obliquely upward from the top end of the lever. Each of the pulling protrusions is pivotably attached, a pry opening is formed at the rear end of the lever, and the T-shaped or hook-shaped pulling protrusion is inserted into a pulling hole formed in the manhole cover, and the lever is A manhole cover opener characterized in that the manhole cover is lifted by the action of a lever with the caster as a pivot point when pushed down.