JP2564695Y2 - Manhole cover opening device - Google Patents

Description

[Detailed description of the invention]

[0001]

In the present invention, when the iron cover of a manhole is opened to inspect or work inside the manhole, the contact surface between the outer peripheral surface of the iron cover and the inner peripheral surface of the receiving frame is in close contact. This tool is used when it is difficult for one person to open the lid, or when it takes time to open the lid.

[0002]

2. Description of the Related Art Conventionally, when an iron cover is provided on a receiving frame of a manhole and the cover is opened, the cover can be opened with a relatively small force by one person. However, when trying to open the iron lid once applied to the receiving frame, the lid may remain closed for a long time, or as a result of frequent passage of vehicles, etc. on the upper surface of the iron lid, the receiving frame may be opened. The inner peripheral surface of the iron lid and the outer peripheral surface of the iron lid are steeply tapered so that the iron lid is in close contact with the receiving frame and cannot be opened unless a strong force is applied. May not be in time for lid.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and has as its object to provide an opening device for opening an iron cover easily, quickly, and surely with weak human power.

[0004]

Means for Solving the Problems The present invention provides (1) (a)
A biting and separating bar 10 provided with an L-shaped key portion 11 to be engaged with the hole 36 of the iron cover 3 of the manhole; (b) a bottom plate 21 and a guide side plate 2 placed on the upper edge 1a of the receiving frame 1 of the manhole.
A work platform frame 20 composed of the work platform frames 2 and 23;
And (d) the vertical moving member 2 which is mounted on the pistons 44 and 45 of the hydraulic cylinders 42 and 43 disposed on the bottom plate 21 and is guided by the guide side plates 22 and 23.
4 is a manhole cover opening device comprising a support plate 33 which moves up and down together with the supporting plate 4 and locks the biting and separating bar 10.
In the above (1), the guide holes 29, 3 formed in the guide side plates 22, 23 of the work table frame 20 are provided on both sides of the vertically moving member 24.
This is a manhole cover opening device provided with guide shafts 27 and 28 that engage with the cover.

[0005]

The work table frame 20 is held by the handle 2 of the guide side plates 22 and 23.
Holding the upper edge 1 of the receiving frame 1 of the manhole cover 3 with the 2a, 23a
The bottom plate 21 of the work table frame 20 is placed on a. The L-shaped key portion 11 of the biting and separating bar 10 is connected to the hole 36 of the manhole iron cover 3.
Hook on. By operating the hydraulic device 40, the cylinders 42, 4
The pistons 44, 45, the vertically movable member 24, and the biting / separating bur 10 are raised and the outer peripheral surface of the iron cover 3 and the inside of the receiving frame 1 are engaged by the L-shaped key portion 11 engaged with the hole 36 of the iron cover 3. Separate the bite from the surrounding surface.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is an explanatory view showing a state where an iron cover provided on a manhole receiving frame is to be opened by an opening device, FIG. 2 is an exploded perspective view of a part of the opening device, and FIG. 3 is an operation of the opening device. FIG. 4 is an enlarged perspective view of a work table partially cut away, and FIG. 5 is a side view of FIG.

Although the figure shows a device for opening a circular iron lid, it can also be used as a device for opening a square or other shaped iron lid. 1 is a manhole receiving frame (hereinafter referred to as a receiving frame), 2 is an inner peripheral inclined surface of the receiving frame 1, 3 is an iron lid having an outer peripheral inclined surface 4 fitted to the inner peripheral inclined surface of the receiving frame 1, A hole 36 for locking the L-shaped key portion 11 of the biting and separating bar 10 is provided on the periphery. Reference numeral 20 denotes a work frame provided with a bottom plate 21 placed on the upper surface 1a of the receiving frame 1 and side plates 22 and 23 on both sides. The guide side plates 22 and 23 of the work frame 20 are provided with vertically long holes 29 and 30 into which guide shafts 27 and 28 protruding from both ends 25 and 26 of the vertically movable table 24 that moves up and down are loosely inserted. Reference numeral 31 denotes nuts screwed to the guide shafts 27 and 28, respectively. Also, grip portions 22a and 23a are provided above the guide side plates 22 and 23.

A through hole 32 is formed in the center of the vertical moving table 24, and a bar insertion hole 34 for biting and separating is formed in a support plate 33 mounted on the upper surface of the vertical moving table 24. The biting and separating bar 10 penetrates and is disposed at 34. Then, the L-shaped key portion 11 formed at the lower end of the biting and separating bar 10 is engaged with the hole 36 of the iron cover. Reference numeral 50 denotes a rotatable nut screwed onto a male screw 10a formed at the upper end of the biting and separating bar 10. Reference numeral 40 denotes a commercially available hydraulic pump, and reference numeral 41 denotes a handle of the hydraulic pump 40. The handle 41 is moved up and down to open and close a valve (not shown) of the hydraulic device 40 to apply hydraulic pressure to the work platform frame 20 by pipes 46 and 47. Pistons 4 of hydraulic cylinders 42 and 43 disposed on bottom plate 21
Push 4,45 upward. Since the pistons 44 and 45 are in contact with the lower surface of the vertically movable table 24, the pistons 44 and 4
5 rises, the support plate 33 and the biting and separating bar 10 are raised, and the biting and separating bar 1 engaged with the hole 36 of the iron lid 3 is raised.
The L-shaped key portion 11 of 0 is also raised and the iron cover 3 is opened. After opening, check valve of hydraulic device 40 (not shown)
To open the oil in the cylinders 42 and 43 and pipes 46 and 47
The vertical moving table 24 is returned to the hydraulic
Then, the L-shaped key portion 11 of the biting and separating bar 10 is removed from the hole 36 of the iron cover 3. Thereafter, a normal burl is inserted into the keyhole of the iron cover 3 and hooked to raise the iron cover.

[0009]

[Effects of the Invention] Since the inner peripheral surface of the receiving frame and the outer peripheral surface of the iron lid are fitted and closely fitted in a wedge shape, it is often impossible to open the iron lid by hand. As we did
The hydraulic cylinder installed on the workbench frame moved the up-and-down moving member up, and at the same time moved up the biting and separating bar, so it did not require large manpower and was locked around the hole in the iron lid. The iron lid can be easily opened quickly with the L-shaped key portion of the biting and separating bar. Open the joint between the receiving frame and the iron lid, then raise the iron lid with a normal bar. In addition, since the guide shaft of the vertical moving member is inserted through the guide hole provided in the guide side plate of the working frame, the vertical moving member can move up and down smoothly. In addition, the bar for biting and separating is arranged on a support plate movably mounted on the work table frame so that it can be adjusted up and down with a nut screwed to the bar for biting and separating. The L-shaped key portion can be easily engaged with and disengaged from the hole of the iron lid. Further, the work table frame can be easily moved to a required position by grasping the grip portion on the upper portion of the guide side plate by hand.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a state in which an iron cover is removed from a receiving frame.

FIG. 2 is an enlarged perspective view in which a part is disassembled.

FIG. 3 is an enlarged cross-sectional view of the receiving frame and a part of the iron cover in a state where the biting and separating bar is engaged with a keyhole of the iron cover.

FIG. 4 is an enlarged perspective view of a work table partially cut away.

FIG. 5 is a side view of FIG. 4;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 receiving frame 1a upper edge of receiving frame 2 inclined inner peripheral surface of receiving frame 3 iron cover 4 inclined outer peripheral surface of iron cover 10 bar for biting and separating 11 L-shaped key portion of bar for biting and separating 20 work table frame 21 work table frame Bottom plate 22, 23 Guide side plate 24 Vertical moving member 27, 28 Guide shaft 29, 30 Guide hole 33 Support plate 42, 43 Hydraulic cylinder 44, 45 Piston of hydraulic cylinder

Claims (2)

(57) [Scope of request for utility model registration] 1. (a) a biting and separating bar 10 provided with an L-shaped key portion 11 which engages with a hole 36 of an iron cover 3 of a manhole; and (b) mounted on an upper edge 1a of a receiving frame 1 of the manhole. Work frame 20 composed of bottom plate 21 and guide side plates 22 and 23
(C) a vertically movable member 24 mounted on pistons 44, 45 of hydraulic cylinders 42, 43 disposed on the bottom plate 21 of the work frame 20, and guided by the guide side plates 22, 23; A) a manhole cover opening device, comprising: a support plate 33 which moves up and down together with the up and down moving member 24 to lock the biting and separating bar 10; 2. A manhole cover according to claim 1, wherein guide shafts 27 and 28 are provided on both sides of the vertical moving member 24 so as to engage with guide holes 29 and 30 formed in the guide side plates 22 and 23 of the work table frame 20. Opening device.