JPH0220273Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a device for opening a manhole cover.

(Prior art) This type of instruments and devices include those that engage a hook-like part at or near one end of a manhole cover to pry it open (Utility Model Publication No. 49-32065, Utility Model Application No. 58-115539, etc.);
Alternatively, a device that lifts the entire lid using a device installed above the lid (Utility Model Publication No. 34-7975, Publication No. 49-49)
No. 35977, No. 48-33654, etc.), but while the former are generally lightweight, they are functionally inadequate;
The latter has the disadvantage that the entire lid is lifted at the same time, making the device large and complicated, and requiring a relatively large operating force.

(Technical issue) Therefore, the present invention allows the entire lid to be opened with a small operating force by using a combination of screw and lever action.
The present invention also aims to provide a manhole cover opening device whose constituent members are lightweight and easy to handle.

(Technical Means) The present invention that achieves the above object includes a plurality of pry rods 4 provided at the periphery of the lid body 1 with tip hooks 3 fitted into a plurality of pry holes 2 . The lifting body 5 to be arranged is connected to the lifting body 5 by a tension rod 6, and an operation screw rod 9 having a fulcrum 7 at the lower end and an operation part 8 at the upper part is screwed perpendicularly to the lifting body 5, and both ends are provided with lid holders. The fulcrum 7 is supported on a substantially gate-shaped side base rod 11 that is supported by a frame 10 or the like and extends over the lid 1.

In the above, the lever action by the pry rods 4 can be performed by the screw action by the elevating body 5, the operating screw rod 9, and the tension rod 6, so that the operating force is significantly reduced.

(Embodiment) The illustrated embodiment includes a lid body 1 having three prying holes 2 at equal intervals on the periphery, and a frame body 10 having a tapered surface 1.
3, the three pry rods 4 have curved tip hooks 3 that fit into three pry holes 2, and the tips of the tension rods 6, 6, 6 are connected at their upper ends. Each tension rod 6 is
is pivotally supported by a similar pivot 14 to a three-pronged elevating body 5 disposed above the lid body 1 at its base end, and the elevating body 5 has a female screw hole 1 formed at its center.
An operating screw rod 9 having a male thread 16 is screwed together with the screw rod 5, and a sphere 7a is rotatably embedded in the lower end of the rod 9 to form a fulcrum 7 (see FIG. 4). 11a
1 shows a recess formed on the upper center surface of the base rod 11 for abutting the sphere 7a. Note that the tension rod 6 is
A pair of screw rods 17 and 18 forming left and right male threads
It has a tambuckle structure which is screwed onto the left and right female threads of the rotator 19 to make it expandable and retractable, and the operating portion 8 at the upper end of the screw rod 9 is provided with a bolt-shaped head 8a and a handle insertion hole 8b. The base rod 11 has leg pieces 20 at both ends that abut against the upper edge of the frame 10, and has a substantially gate-shaped side surface with a middle height. The leg pieces 20, 20
can have an appropriate form depending on the shape of the frame 10, and may also be brought into contact with the outside of the frame. In each figure, 10a is the inner edge of the frame that serves as the fulcrum of the pry rod 4, 21 is a large number of catch pieces protruding from the inner edge of the frame 10 at regular intervals to prevent the lid from digging in, and 22 is the inner lower part of the frame 10. shows positioning pieces vertically installed at regular intervals.

(Functions and Effects) Based on the above configuration, when opening the lid, the tip hooks 3 of the pry rods 4 are inserted and locked in each pry hole 2, while the leg pieces 20 of the gate-shaped base rod 11, 2
0 to the upper edge of the frame 10, respectively, and the operation screw 9
When screwed into the elevating body 5 from the lower end and applied to the recess 11a of the base rod 11 (solid line in Figure 1), each pry rod 4
. . , the tension rods 6 . . . may be arranged on the lid body 1 at equal intervals. At that time, the tension rod 6...is rotated by the rotator 1 as necessary.
By turning 9, the length of the fulcrum sphere 7a can be adjusted so that it fits into the recess 11a. And the operation section 8
When the screw rod 9 is rotated by applying a rotating operating tool, a spanner, etc. to the screw rod 9, the tension rods 6 expand as the elevating body 5 rises, and at the same time, each pry rod 4...
Since it opens outward and falls down, the upper edge of the frame 10 becomes a fulcrum, and the tip hook 3 becomes a point of action to pry up the lid 1 from three places at once.

Therefore, according to the present invention, the lid 1 can be pried open using the lever action of a plurality of pry rods 4 at its peripheral edge, and each pry rod 4 is provided with a tension rod 6. Since the acting force of the screw acts through the screw, the acting force of the operating screw 9 is significantly increased, making it possible to easily open the lid with a small force, and since the entire lid 1 is lifted in the same way at the same time, the work efficiency is improved. Moreover, since each component of the device is a rod, it is light and easy to transport and handle, and it also has remarkable effects such as increased portability because it can be folded down to make it smaller or disassembled by removing the connecting parts.

[Brief explanation of drawings]

The drawings relate to an embodiment of the manhole cover opening device according to the present invention, in which FIG. 1 is a partially cutaway side view, FIG. 2 is a partially cutaway front view seen from the front of the base rod,
FIG. 3 is a plan view, and FIG. 4 is an enlarged sectional view of the fulcrum. DESCRIPTION OF SYMBOLS 1... Lid body, 2... Pry hole, 3... Tip hook part, 4... Pry rod, 5... Elevating body, 6... Tension rod, 7... Fulcrum, 8... Operation part, 9 ... Operating screw, 10 ... Frame body, 11 ... Base frame.

Claims (1)

[Scope of utility model registration request] A plurality of pry holes 2 provided on the periphery of the lid body 1...
A plurality of prying rods 4 into which tip hooks 3 are fitted are connected to a tension rod 6 and an elevating body 5 disposed in the center of the lid body 1.
..., an operating screw 9 having a fulcrum 7 at the lower end and an operation part 8 at the upper part is screwed perpendicularly to the elevating body 5, and both ends are supported by the lid receiving frame 10 etc., and the operating screw 9 is mounted on the lid body 1. A manhole cover opening device in which the fulcrum 7 is supported on a substantially gate-shaped base rod 11 extending from the side.