JPS6234939Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gripping tool for concrete blocks used for lifting and transporting concrete blocks and the like used in civil engineering construction work by construction machines and the like.

Conventionally, this type of device is an improved version of the so-called stone picker, which has existed since ancient times, and uses a method to obtain gripping force by applying a load, but when it touches the ground, the gripping force decreases rapidly, making it dangerous during cargo handling operations. The first drawback is that it has a lot of characteristics. In addition, in order to compensate for this drawback, there are many devices that forcibly tighten the screws in conjunction with each other using screws, but the second drawback is that the work of turning the screws is inefficient. The object of the present invention is to provide a gripping device for forced gripping of concrete blocks which overcomes the above-mentioned drawbacks.

The configuration will be described in detail below with reference to embodiments. FIG. 1 is a perspective view of the assembled embodiment of the present invention. First, each component to be assembled will be explained.

2 and 3 are a front view and a plan view of the fixed rod A. At the right end of the square pipe of the rectangular parallelepiped, two pieces of band-shaped steel material are symmetrically welded together on the outside of the square pipe to form a fork-shaped part, and a main bearing hole 1 is bored therethrough. Pass the bolt hole vertically through the left end and weld the crank receiver nut 2 on top. Claw width adjustment hole 3 on the side of the square pipe
Drill several horizontal holes. A lower spring receiving ring 4 is welded to the upper surface of the central portion.

4 and 5 are a front view and a right side view of the moving rod 5. Two steel plates are symmetrically stacked and welded sideways to a square pipe similar to fixed rod A to form a fork-shaped part.
A claw width adjustment receiving hole 6 is drilled horizontally. Furthermore, a front rubber receiving hole 7 is bored through the lower part.

FIG. 6 is a front view of the crank pedestal B. The crank holder 8 is made of a band-like material reinforced using a composite material of soft iron and high carbon steel, and a seat height adjusting screw 9 is welded to the lower center portion, and a fixing nut 10 is screwed thereon.

7, 8, and 9 are a front view, a right side view, and a plan view of the rubber claw 11. Nail plate 12 molded into a U shape
symmetrically attach the two support plates 13 to the fixed rod A mentioned above.
Welded to the same inner width as the fork-shaped part, the rubber claw receiving hole 13'
is drilled horizontally, and two rubber stopper holes 14 are provided avoiding the support plate 13.

Figures 10, 11, and 12 are front views of the pressure rod C;
They are a left side view and a right side view. Form a square pipe similar to that of fixed rod A into an L shape, and symmetrically overlap and weld two thick steel strips on the outside at the bottom of the left end to form a serpentine part, and drill the crank receiving hole 15 horizontally. . Furthermore, several balance holes 17 are bored through the horizontal rod 16,
The upper spring receiver ring 18 is welded to the lower center side. Vertical rod 19
has a rear rubber claw hole 20 at the bottom end and a main shaft hole 2 at the top.
1 is drilled horizontally.

FIG. 13 is a perspective view of the crank fitting D.
An eccentric hole 23 near the outer periphery of the round rod-shaped crank core 22
A crank handle 24 formed in a U-shape is horizontally welded to the opposite outer periphery.

Next, assemble each part. The seat height adjustment screw 9 of the crank holder B is screwed into the crank holder nut 2 of the fixed rod A, and the eccentric hole 23 of the crank fitting D is supported by the crank holder hole 15 on the forked part of the pressure rod C. Then, on the left side of the rear rubber claw hole 20, there is a rubber claw receiving hole 1 for the rubber claw 11.
3' is pivotally supported, and the rubber plate 25 is riveted to the rubber stopper hole 14.

Next, at the position where the crank core 22 is placed on the crank holder 8, press the main bearing hole 1 of the fixed rod A with the pressure rod C.
The return spring 26 is suspended between the upper spring receiving ring 18 and the lower spring receiving ring 4. Furthermore, the rubber claw receiving hole 1 of the rubber claw 11 is placed in the front rubber claw hole 7 of the moving rod 5.
3' is pivotally supported, the rubber plate 25 is riveted to the rubber stopper hole 14, and the two rubber plates 25 are screwed into the claw width adjustment hole 3 of the fixed rod A using the detachable pin 27 so that the two rubber plates 25 face inward. Supports the width adjustment receiving hole 6. The movable rod 5 is constructed with dimensional accuracy such that the upper end of the square pipe is in close contact with the lower side of the fixed rod A and does not move from side to side. When the assembly is completed in this way, the result will be as shown in FIG.

Before explaining the usage and effects, the lever increase of the crank fitting D, which is one of the characteristic constituent elements of the present invention, will be explained in detail below. FIG. 14 shows the movement of the eccentric hole 23 of the crank fitting D as the crank handle 24 is rotated and pressurized, and the contact point between the crank holder 8 and the crank core 22, that is, the crank for pushing up the eccentric hole 23. FIG. 6 is an explanatory diagram showing a change in the fulcrum distance when levering the handle 24; The shaded area indicates the crank holder 8, the large circle indicates the crank core 22, the small circle indicates the eccentric hole 23, and the black circle indicates the welding point between the crank handle 24 and the crank core 22. The movement angle is 45 degrees, followed by E ¹ to ^{E 5} in four stages, and the final E ⁶ shows an additional 10 degrees of excess movement.

The length of the crank handle 24 according to the embodiment is
200mm, diameter of crank core 22 is 40mm, eccentric hole 2
3, a hole with a diameter of 8 mm is drilled at a position 10 mm from the outer circumference, and the crank handle is located about 90 degrees to the right of the outer circumference facing the eccentric hole 23 from the line connecting the center of the eccentric hole 23 and the center of the crank core 22. This is the position where 24 is horizontally welded. When the crank handle 24 is continuously rotated in the direction of the arrow, the approximate value of the leverage ratio at each point shown in the illustration is E ² ~ 220/7≒31 times, E ³ ~ 220/
10≒22x, E ⁴ ~220/7≒31x, E ⁵ ~220/1≒
220 times・E ⁶ ~ 220/3 ≒ 73 times. The denominator represents the fulcrum distance, and the numerator represents the effective length of the crank handle.

In practice, E ¹ to ^{E 3} are movements that simply reduce the claw width, so no pressing force is required. The range from E ³ to ^{E 5} is where pressure is required, and the leverage ratio increases continuously by approximately 20 times or more until the maximum pressure point E ⁵ is reached.
This shows that it is possible to increase the power by nearly 200 times. If the pressing force with both hands is 50 kg, it is possible to achieve a pressing force of 10 tons. E ⁶ indicates the position where the crank handle 24 is locked on the crank holder 8 by further pushing, and the locking of the crank handle 24 on the crank holder 8 is strengthened by passing the maximum pressure point. . At E ⁶ , the maximum pressure decreases, but a strong pressure is exerted due to the repulsive force between the rubber plate 25 and the pressure rod C, which is once pressurized 200 times.

During operation from E ⁴ to E ⁶ , rolling friction occurs depending on the applied pressure, so the crank holder 8 is made of a composite steel material made by crimping soft iron to high-grade high-carbon knife steel. The core 22 is also made of high-grade special steel and has a surface polished to reduce rolling friction.

Furthermore, if the straight-line distance from the crankshaft hole 15 and the rear rubber hole 20 of the pressure rod C to the main shaft hole 21 is made equal, the lever increase of the crank fitting D described above will be directly transmitted to the rubber pawl 11, and the pawl will Width opening/closing distance is 30
mm, making it easy to attach and detach from concrete blocks.

15 to 17 are diagrams showing how the groove cover, L-shaped block, and boundary block of the present invention are used. 18th
The figure is a front view showing the crank fitting D of the present invention in a locked state. The usage and effects are explained below.

Hold the opposing rubber plates 25 in a parallel state and move the moving rod 5 so that its inner width matches the two parallel sides of the concrete block. The width adjustment receiving hole 6 is pivotally supported to adjust the claw width to the nearest dimension.

Next, turn the seat height adjustment screw 9 of the crank holder B to raise or lower the crank holder 8, and adjust the inner width of the rubber plate 25 by 6 mm from the two parallel sides of the concrete block.
Fix by tightening the fixing nut 10. When the crank handle 24 is lifted, the rubber pawl 11 is opened outward by the return spring 26, and the adjustment work is completed.

Install rubber claws 11 across the concrete block,
When the crank handle 24 is rotated with both hands and pushed down, the rubber claw 11 strongly grips the concrete block via the rubber plate 25 due to the increased leverage of the crank metal fitting D mentioned above. After that, attach a wire to the balance hole 17 with a shackle or the like and lift it up with a machine.
Transport the concrete blocks to the designated location.

As mentioned above, the claw width adjustment work is done only once for the first time for the same block, and after that, by simply rotating the crank handle 24 by 180 degrees, the block is forcibly gripped strongly from the beginning. This eliminates the first drawback of the risk of falling off during cargo handling operations, and also eliminates the second drawback of inefficiency in turning the screw. Moreover, the structure of the moving rod 5 can be used in many different types without limiting the target concrete block, and the effect of increasing the force of the crank fitting D due to the movement of the moving rod 5 is not reduced. As described above, this invention is remarkable in its effectiveness in improving the efficiency of civil engineering site work with ease of operation.

In patent application No. 1983-4410 filed by the same applicant, the height of the crank holder is fixed and the gripping width is limited to a constant, but the present invention allows fine adjustment of the claw width. This is characterized by the effect of expanding the range of use without sacrificing the convenience of increasing the crank force by making it possible to vertically adjust the crank pedestal.

[Brief explanation of the drawing]

Fig. 1...A perspective view of the embodiment of the present invention, Fig. 2...A front view of the fixed rod A, Fig. 3...A plan view of the same, Fig. 4...
Front view of the moving rod 5, Figure 5... Right side view of the same, Figure 6... Front view of the crank holder B, Figure 7... Front view of the rubber pawl 11, Figure 8... Right side of the same. Figure 9...Front view of the same, Figure 10...Front view of pressure rod C,
Fig. 11...Left side view of the same, Fig. 12...Right side view of the same, Fig. 13...A perspective view of the crank fitting D, Fig. 14...The rotation of the crank handle 24 of the same. An explanatory diagram showing changes in the fulcrum distance, Fig. 15... A diagram of the usage state of the present invention in a groove cover, Fig. 16...
Diagram of the usage state of the present invention in an L-shaped block, 1st
Figure 7... Usage state diagram in boundary block, No. 18
Figure...Front view of the crank fitting D of the present invention when locked A...Fixing rod, B...Crank pedestal, C...Pressure rod, D...Crank fitting, 1...Main bearing hole, 2
...Crank retainer nut, 3...Claw width adjustment hole, 5...
...Moving rod, 6...Claw width adjustment receiving hole, 7...Front rubber claw hole, 11...Rubber claw, 15...Crank receiving hole, 2
0...Rear rubber pawl hole, 21...Main shaft hole, 22...Crank core, 23...Eccentric hole, 24...Crank handle, 25...Rubber plate, 26...Return spring, 2
7... Detachable pin.

Claims (1)

[Scope of Claim for Utility Model Registration] (a) The main bearing hole 1 of the fixing rod A has the crank holder B screwed onto the upper part of one end, (b) The crank fitting D is attached to the upper end of the inverted L-shaped molding. The eccentric hole 23 is supported in the crank receiving hole 15, and the main shaft hole 21 of the pressure rod C is supported, and (c) the claw width adjustment receiving hole 6 of the moving rod 5 is attached and removed to the claw width adjustment hole 3 of the fixed rod A. (d) Rubber claws 11 are axially supported inwardly and symmetrically in the front rubber claw hole 7 at the lower end of the fixed rod A and the rear rubber claw hole 20 at the lower end of the movable rod 5; (e) The crank holder B is screwed onto the crank holder nut 2 formed at one end of the fixing rod A.
The claw width can be freely finely adjusted by the seating height adjustment screw 9, and (f) the crank fitting D stops in contact with the crank pedestal B at a position immediately after passing the maximum pressure point. A gripping device for lifting and transporting concrete blocks.