JP3251700B2 - Manhole cover opening device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover opening device for cutting and lifting a manhole cover.

[0002]

2. Description of the Related Art Generally, when removing a manhole cover made of cast iron or the like attached to an opening of a manhole, sediment or the like accumulated in a gap between the manhole cover and its receiving frame is solidified or disposed on one side. If the installed packing is adhered to the other, it is difficult to open the packing only by human power. Therefore, a cover opening device for easily opening the manhole cover is used.

As shown in FIG. 4, a conventional general lid-opening device horizontally supports a support rod b having an elongated through hole a formed by supporting legs c provided at both ends. Hooks f, which are respectively engaged with handles e, e of the manhole cover d.
A pair of screw rods g, g having a lower end f are inserted through the insertion hole a from above, and the screw rods g, g are supported on the support rod b by nuts h, h screwed on the upper part. Is done. Then, the supporting rod b is inserted above the manhole cover d, and the nuts h, h are wrench-like while the hooks f, f of the screw rods g, g are engaged with the handles e, e of the manhole cover d. Screw g, g
, The manhole cover d is cut off and lifted, and in this state, the two ends of the support rod b are respectively held by two workers to move the manhole cover d.

[0004]

In the above-mentioned conventional opening device, the hooks f, f are connected to the manhole cover d.
When engaging with the handles e, e, the screw rods g, g are inserted in the insertion holes a of the support rods b.
Must be tilted to engage the hooks f, f, so that the workability is poor, and even after the hooks f, f are engaged, the nuts h, f until the screw rods g, g no longer move.
Since it is necessary to tighten h by hand, it takes time.

Further, when the manhole cover d is moved, the manhole cover d must be manually lifted together with the cover-opening device. Therefore, the weight of the cover-opening device is added and extra force is required. Because it has a portable structure,
Even a relatively light lid is not easy to carry alone.

An object of the present invention is to provide a manhole opening device free of such disadvantages.

[0007]

According to the present invention, there is provided a support rod which is inserted across a manhole cover with one end serving as a support end;
A screw rod vertically screwed to the other end of the support rod, and the lower end of the support rod movably supported by a pedestal mounted on the ground; and a support rod corresponding to a handle position of a manhole cover. A pair of fitting grooves formed on the side along the vertical direction,
A main rod portion is fitted into the fitting groove so as to be freely inserted and removed from the side, a hook is formed at a lower end thereof to be engaged with a handle of a manhole cover, and an upper end is supported on an upper surface of the support rod. And a handle rod forming a handle portion.

[0008]

First, the hook of the handle rod is engaged with the handle of the manhole cover, and then the support rod is slid from the side to fit the fitting groove into the main rod portion of the handle rod. When the screw rod is rotated in a predetermined direction in this state, the support rod is lifted,
The manhole cover is cut off by the handle rod supported by the support rod and pulled up.

When the manhole cover is moved, the support rod can be removed and the manhole cover can be hung only by the handle rod.

[0010]

An embodiment of the present invention will be described with reference to FIGS. In the drawings, 1 indicates a manhole cover, and 2 indicates a receiving frame of the manhole cover 1. The manhole cover 1 is provided with a pair of handle holes 3, 3 at both left and right positions, and handles 4, 4 are suspended in the handle holes 3, 3.

Reference numeral 5 denotes a support rod which constitutes the manhole cover opening device according to the present invention. The support rod 5 is formed to have a length such that the support rod 5 can extend across the manhole cover 1 along its diameter. A support end 6 is integrally formed at one end in the longitudinal direction, and a jack mechanism 7 for raising and lowering the support rod 5 is provided at the other end.

The jack mechanism 7 includes a screw rod 9 vertically screwed into a screw hole 8 formed at the other end of the support rod 5.
And a pedestal 10 placed on the ground and supporting the lower end of the screw rod 9 so as to freely rotate. A nut 11 is fixed to the vicinity of the lower end of the screw rod 9 by welding or the like, and the lower end of the screw rod 9 is formed in the pedestal 10 with the nut 11 abutting on the pedestal 10 via a washer. 12 is loosely fitted. Thereby, the screw rod 9 is provided so as to idle around the pedestal 10. A nut 13 for retaining the screw rod 9 or an E-ring (not shown) is screwed to the lower end of the screw rod 9 facing the pedestal 10.

The support rod 5 is provided with a pair of right and left fitting grooves 14, 14 at positions corresponding to the handles 4, 4 of the manhole cover 1. The fitting grooves 14, 14 are formed along the up-down direction of the support rod 5, and are opened on the side surfaces of the support rod 5 so that a main rod portion 15a of the handle rod 15, which will be described later, can be stored from the side. . Further, one of the fitting grooves 14 is provided so as to be able to cope with the interval between the handles 4 and 4 which varies depending on the diameter of the manhole cover 1.
Is provided with another fitting groove 14 '.
Also, on the upper surface of the support rod 5, each fitting groove 14, 14, 14 'is provided.
Locking protruding edge 1 of handle rod 15 at front edge positions on both left and right sides of
6 and 16 are respectively formed.

The above-mentioned handle bars 15 are provided in a pair on the left and right. Each of the handle rods 15, 15 is fitted with the fitting groove 14 respectively.
A main rod portion 15a which is fitted to be able to be inserted and removed from the side,
Hook 15 at the lower end engaged with handle 4 of manhole cover 1
b and an annular handle 15c supported on the upper surface of the support rod 5 at the upper end. The hook 1
As shown in FIG. 3, 5b has a width L close to the width L 'of the handle hole 3. Thereby, when the hook 15b is engaged with the handle 4, the handle rod 15 is supported by the side surface of the handle hole 3, and the handle rod 15 is prevented from falling sideways.

The method of use and operation of the lid opening device having the above-described configuration will be described. First, the hooks 15b, 15b of the handle rods 15, 15 formed separately from the support rod 5, are engaged with the handles 4, 4 of the manhole cover 1, respectively. Next, support rod 5
Is slid from the side to fit the fitting grooves 14, 1 of the support rod 5.
4 is fitted to the main rod portions 15a, 15a of the handle rods 15, 15, and further, each of the fitting grooves 14, 14 is formed on the upper surface of the support rod 5.
The locking projections 16, 16 disposed on the front edges on both sides of the
c and 15c. When the screw rod 9 is rotated in a predetermined direction with a tool such as a wrench in this state, the screw rod 9 is rotated.
Idles on the pedestal 10, and one end of the support rod 5 with which the screw rod 9 is screwed is gradually lifted by the relative screwing action with the support end 6 at the other end as a fulcrum. By lifting the support rod 5 in this manner, the handle rods 15 attached to the support rod 5 are also lifted, and the handle rod 1 is lifted.
The manhole cover 1 is cut off from the receiving frame 2 by 5 and 15 and pulled up. At this time, the handle rod 15,
The lower portions of the 15 grips 15c, 15c are locking projections 16, 1
6, the handle rod 1
5 and 15 are held without coming off from the support rod 5.

Next, when the main rods 15a, 15a of the handle rods 15, 15 are disengaged from the fitting grooves 14, 14 of the support rod 5, for example, by sliding the support rod 5 sideways, the manhole cover 1 is removed. Is in a state where it can be hung only by the handle bars 15, 15. As a result, the handle portions 15 of the handle bars 15
The manhole cover 1 can be moved by grasping c and 15c.

In the jack mechanism 7 of the above embodiment, the nut 11 is fixed to the vicinity of the lower end of the screw rod 9 by welding or the like, and the nut 11 is brought into contact with the pedestal 10. However, the present invention is not limited to this. Instead, any structure may be used as long as the screw rod 9 is supported by the pedestal 10 and rotates idle. Further, when one end of the support rod 5 is lifted with the support end 6 at the other end as a fulcrum by the rotation operation of the screw rod 9, the support rod 5 is tilted, and the screw rod 9 is also tilted accordingly. The insertion hole 12 of the pedestal 10 is formed slightly larger in diameter so as to be able to cope with the inclination of the screw rod 9, but may be replaced by an elliptical shape.

[0018]

According to the present invention, as described above, a fitting groove is formed in the side surface of the support rod, and the main rod portion of the handle rod is fitted into the fitting groove so as to be freely inserted and removed from the side. Thereby, since the support rod and the handle rod can be separated from each other, the workability at the time of the engagement work between the handle of the manhole cover and the hook of the handle rod is extremely good, and by the fitting means, Separation and assembly work of the handle rod and the support rod can be performed quickly and easily.

Further, when the manhole cover is moved, it is not necessary to suspend the manhole cover together with the cover opening device as in the prior art, and the manhole cover can be moved only by the handle bar, so that the labor of the operator is reduced. Further, there is an excellent effect that a relatively light lid can be moved alone.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a manhole cover opening device according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is an explanatory view showing a relationship between a handle portion of a manhole cover and a hook portion of a handle rod.

FIG. 4 is a partially cutaway front view of a conventional structure.

[Explanation of symbols]

 Reference Signs List 1 manhole cover 4 handle 5 support rod 6 support end 9 screw rod 10 pedestal 14 fitting groove 15 handle rod 15a main rod 15b hook 15c handle

Claims (1)

(57) [Claims] 1. A support rod extending over a manhole cover with one end as a support end, and a lower end screwed to the other end of the support rod in a vertical direction and mounted on the ground with a lower end. A freely rotatable screw rod, a pair of fitting grooves formed on the side surface of the supporting rod corresponding to the handle position of the manhole cover along the vertical direction, and inserting and removing the fitting groove from the side. A handle rod having a main rod portion freely fitted therein, a hook formed at the lower end thereof for engaging with a handle of the manhole cover, and a handle portion formed at an upper end on the upper surface of the support rod; A lid opening device for manholes, comprising: