JPH0213555Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a tool used to open, close, and move a manhole iron cover.

(Prior Art) Conventional tools and devices of this type include those that utilize a screw-type jack and those that utilize a lever action.

(Problems to be solved by the invention) However, the above-mentioned screw-type jacks have a complicated structure, are heavy, and the work using them is complicated. In the case where the manhole iron cover is raised to the height required for movement, the lever ratio is small in order to raise the manhole iron cover to the height required for movement, so the iron cover and the receiving frame are stuck together due to dirt, etc. that gets between them. In such a situation, it was difficult to open the iron lid. Therefore, by increasing the lever ratio, the force applied to the iron lid can be increased.
It would be possible to release the fixed state between the iron lid and the receiving frame, but it has been difficult to do so due to the structure.

In view of the above points, the present invention uses a lever action to easily release the fixed state between the iron lid and the receiving frame, and also allows the iron lid to be raised to the height required for movement. To provide a manhole iron cover opening/closing moving tool which allows the iron cover to be easily moved and allows one worker to perform the work continuously and easily in a short time with a small burden.

(Structure of the invention) Fig. 1 is a front view of an embodiment of the invention, Fig. 2 is a partially enlarged front view, Fig. 3 is a rear view of the same part as Fig. 2, and Fig. 4 is a perspective view in use. Show the diagram, 1
It is a lever rod with a vertical lower part, a main lever part 2 bent at the upper part, and a handle 4 provided at the horizontally bent part of the upper part, which allows entry and exit into the main lever part 2. a telescopic lever part 3, a telescopic locking part 5 for locking the telescopic lever 3 at its maximum extended point and the most retracted point, and a horizontal direction from the lower vertical part of the main lever part 2. Protruding bifurcated small wheel 7
It is twisted with a short shaft support piece 6. Reference numeral 8 denotes a shaft rod, which is composed of a long main shaft portion 9 and a short auxiliary shaft 10, and the main shaft portion 9 and the auxiliary shaft portion 10 are connected to a shaft joint 11.
It is connected so that it can be bent. The auxiliary shaft part 10 penetrates the lower vertical part of the main lever part 2 in a right angle direction and is fixed by welding or the like. 12a is a U-shaped large wheel shaft support piece that is fixed to the end of the auxiliary shaft portion 10 in the same direction as the small wheel shaft support piece 6 and is much longer than the small wheel shaft support piece 6. 12b is a long large wheel shaft support piece fixed to the end of the main shaft portion 9 in the same manner as the shaft support piece 12a, and the large wheels 13a, 13b are respectively attached to the tips of these shaft support pieces 12a, 12b. I support you. Reference numeral 14a denotes a pipe-shaped key bar support body which is rotatably fitted to the auxiliary shaft portion 10, and a key bar 15a and a lid holder 16a which abuts and presses the top surface of the iron lid are fixed. The key stick 15a is a key stick length adjustment screw 17
The length can be adjusted. Reference numeral 14b denotes a key rod support body fitted to the main shaft portion 9 so as to be rotatable and movable in the axial direction, and the key rod 1 whose lower half portion can rotate.
5b and the lid holder 16b are fixed. Reference numeral 18 denotes a support rod which connects and supports the other side of the main shaft portion 2 at the upper part of the main lever portion 2, and is capable of being bent inward at a bending portion 19 in the center.
The upper end is attached to the mounting bracket 20 attached to the main lever part 2,
Further, the lower end is connected to a mounting bracket 21 attached to the main shaft portion 9, and this support rod 18 and the main lever portion 2,
It forms a triangle with the shaft rod 8. The small wheel 7 is a key stick 15
a is inserted into the keyhole c of the iron cover a of the manhole,
The lid holder contacts the receiving frame b while holding the iron lid a, and serves as a fulcrum for the lever 1 to slightly lift the iron lid a until it is released from the fixed state with the receiving frame b. At that point, the large wheels 13a, 13b are in contact with the ground surface, and the large wheels 13a, 13b are in contact with the ground surface.
The lever 13b serves as a fulcrum when the lever 1 is further tilted in the same direction to raise the iron cover a to the height required for movement, and also serves as wheels for smooth movement of the iron cover a. The small wheel 7 is pivotally supported by a short shaft support piece 6 protruding from the lower end of the lever lever 1, and the distance from the lever lever 1 is equal to the distance between the handle 3 at the tip of the extended long lever lever 1. Since the distance is extremely small compared to the distance, the lever ratio becomes large, and the angle at which the lever rod 1 is tilted is relatively large in order to slightly raise the iron cover a, but the angle between the iron cover a and the support frame b, which requires an extremely large force, is A relatively small force is required to be applied to the handle 4 to release the stuck state. Moreover, the large wheels 13a, 13b are
Since they are attached to the axle 8 and supported by a sufficiently longer axle support piece than the small wheel axle support piece, the distance between the axle 8 and the grounding points of these large wheels is much larger than in the case of the small wheel 7 described above. Therefore, the lever ratio is small, and the angle for tilting the lever 1 is relatively small in order to raise the iron cover a to the height required to move it.
The force required to rise at this time may be smaller than the force required to release the fixed state between the iron lid a and the support frame b, so even if the leverage ratio is small, the force applied to the handle 4 can be relatively small. .

Therefore, when using the tool of the present invention, as shown in Figs. 4 and 5, the lever 1 is placed on the ground so that the shaft 8 is on the line connecting the keyholes c on both sides of the iron cover a. Stand perpendicular to the surface, insert the key sticks 15a and 15b into the keyhole c of the iron cover a, and rotate them 90 degrees to prevent them from falling out of the keyhole. At this time, adjust the key rod 15a with the adjustment screw 17 to press the lower end protrusion of the key rod 15a against the lower surface of the iron lid a to firmly grasp the iron lid a with the lid holder 16a, and then grasp the handle 4. , when lever 1 is pushed forward, the receiving frame b
The small wheel 7 in contact with the top serves as a fulcrum, and the iron cover a is slightly raised from the side where the key rod 15a is fitted. Since the leverage at this time is large, even if the force applied to the handle is relatively small, the fixed state between the iron cover a and the receiving frame b can be released. If you continue to push the lever 1 toward you as shown in Figure 4, the large wheel 13 will appear as shown in Figure 6.
a, 13b touch the ground, and when the lever 1 is further lowered, the large wheels 13a, 13b are moved as shown in Fig. 7.
serves as a fulcrum to further raise the iron cover a. Since the leverage at this time is small, even if the angle at which the lever 1 is tilted is relatively small, the amount of rise of the iron cover a is large;
It can be completely floated above the ground. While leaving lever 1 at the current inclination, turn handle 4.
When the iron lid a is pulled by the user, the large wheels 13a and 13b act as moving wheels to easily and smoothly move the iron lid a.

When closing the iron lid a, hold it on the support frame b in the same manner as when moving it as described above, and then set the lever lever 1, which had been tilted, in a vertical position.
It can be fitted into the receiving frame b.

When transporting the tool of the present invention, the support rod 18 is bent at the bent part 17, the main shaft part 9 is tilted toward the lever lever 1 side around the shaft coupling 11, and the telescopic lever part 3 is pulled into the main lever part 3. The whole can be made smaller by crowding. This state is the 8th
As shown in the figure.

(Effects of the invention) As explained above, according to the tool of the invention, the small wheel provided to increase the leverage ratio is used as the first fulcrum for tilting the lever, so the force applied to the lever is relatively small. Although it is small, it is possible to apply a large force to the iron lid to release the fixed state between it and the support frame, and the large wheel is installed so that the lever ratio can be reduced by subsequently tilting the lever in the same direction. serves as a fulcrum, the force applied to the lever is relatively small, and even if the lever is tilted at a relatively small angle, it can be raised to the required height, and the large wheels allow the iron cover to move smoothly. Since the iron lid can be opened and closed easily and in a short time by one worker, one worker can easily and quickly open and close the iron lid with less burden. Therefore, it has great effects in terms of labor saving and safety.

[Brief explanation of the drawing]

Fig. 1 is a front view of an embodiment of the present invention, Fig. 2 is a partially enlarged front view, Fig. 3 is a rear view of the part shown in Fig. 2, Fig. 4 is a perspective view in use, 5
The figure is a partial side view showing the iron cover attached to the iron cover, Figure 6 is a side view showing the iron cover released from the fixed state with the receiving frame, and Figure 7 is the height to which the iron cover can be moved. FIG. 8 is a side view showing the state in which it is raised up, and FIG. 8 is a front view showing the state in which it is folded and reduced. 1... Lever lever, 6... Small wheel shaft support piece, 7... Small wheel, 8... Axle rod, 12a, 12b... Large wheel shaft support piece, 13a, 13b... Large wheel, 14a, 14
b...Key stick support, 15a, 15b...Key stick, 1
8... Support rod, a... Manhole iron cover, b... Receiving frame, c... Keyhole.

Claims (1)

[Scope of utility model registration request] A long lever is provided with the lower part fixed perpendicularly to the lever at a position biased to one side of the lever, and a small wheel is attached to a short shaft supporting piece that protrudes to one side of the lower end of the lever. A supporting rod is installed between the middle part of the lever rod and near the end of the lever rod on the side opposite to the fixed side of the lever rod, and the lever is inserted into each keyhole of the manhole iron cover and engaged. Two key rod supports, each provided with a key rod to be obtained, are rotatably inserted into the shaft rod, and the two key rod supports are provided at both ends of the shaft so as to protrude in the same direction as the protruding direction of the small wheel shaft support piece. A large wheel is pivotally supported on a shaft support piece that is much longer than a small wheel shaft support piece, and the large wheel touches the ground when the iron cover is slightly raised by tilting the lever lever using the small wheel as a fulcrum. A tool for opening and closing a manhole iron cover, which is characterized by being designed to serve as a fulcrum.