JP2000328640A - Lifting device for u-shaped gutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lifting device having a simple construction and making lifting work easier and safer without damaging the inner wall surfaces of the U-shaped gutter. SOLUTION: This device comprises a pair of upper arm portions 5 coupled to a lifting portion rotatably, a pair of lower arm portions 6 coupled rotatably and by intersecting respectively to the bottom ends of both the upper arm portions 5, a link mechanism 4 consisting of a coupling plate 7 hinged rotatably to both the bottom ends of lower arm portions separated, and pressure contact portions 10 provided to the outer side of both the lower arm portions 6. By the elongated deformation in a vertical direction due to self-weight of the link mechanism 4, the pressure contact portions 10 are extended in an external direction and the inner wall surface of the U-shaped gutter is pushed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for lifting a U-shaped groove, which is most suitable for lifting a heavy U-shaped groove made of concrete.

[0002]

2. Description of the Related Art Conventionally, as a device for lifting a U-shaped groove made of concrete, there has been known a device for sandwiching and lifting a rib portion provided above a U-shaped groove from the outside. However, since this device has a structure in which the rib portion is sandwiched from the outside, when the U-shaped groove is installed in the soil, it is necessary to dig a groove wider than the width of the U-shaped groove, and the U-shaped groove is laid in the soil. After installing inside, it was necessary to fill back the space outside.

In view of such conventional drawbacks, recently, a lifting device for locking a U-shaped groove from the inside has been developed. As one of them, Japanese Utility Model Laid-Open No. 57-106678 discloses FIG.
As shown in FIG. 2, a pair of upper link plates 1 and 2 and a pair of lower link plates 3 and 4 having upwardly extending portions 3a and 4a via bent portions constitute a rhombic link mechanism A, and both links are provided. The mechanism A is opposed to and separated from the front and rear.

The upper link and the left and right links of the two link mechanisms A, A are connected by connecting shafts 5, 6, respectively, and the reinforcing link plates 7 are connected to both the bent portions of the front and rear lower link plates 3, 4. ,
8 are connected by pivots 9 and 10. Further, the pressing plates 11 and 12 are rotatably mounted between the front and rear extending portions 3a and 4a, and the biting claws 13 are provided on the front surfaces of the pressing plates 11 and 12, respectively. The link mechanism A is extended and deformed in the vertical direction by lifting the 14 with a crane or the like, whereby the pressing plates 11 and 12 are extended in the left-right direction to press and lift both inner wall surfaces of the U-shaped groove.

Another conventional example is disclosed in Japanese Unexamined Patent Publication No.
No. 87265 discloses an internally suspended block lifting device shown in FIG. That is, reference numeral 1 denotes a lifting rod, and a lifting main rod 3 is suspended laterally at a lower end of a main pillar 2 suspended from a central portion of the lifting rod 1, and a pair of front and rear ends of the lifting main rod 3 is provided in front and rear. The upper ends of the right link plate 4a and the rear right link plate 4b and the upper ends of the front left link plate 5a and the rear left link plate 5b are rotatably mounted on the front and rear portions of the lifting main rod 3, respectively. Then, the right and left link plates 4a and 4b and the left and right link plates 5a and 5b are fixed by penetrating rods 6 and 7, respectively.

The central portions of the front and rear right and left links 8 and 9 are rotatably mounted on the main rod 3, respectively, and a pair of lifting arms 1 are attached to the lower ends of the left and right links 8, 9, respectively.
When the lower ends of the lifting arms 10 and 11 are rotatably mounted on the front and rear ends of the lifting main rod 3, the lower ends of the lifting arms 10 and 11 are rotatably mounted. The upper ends of the connecting arm rods 12 are rotatably mounted on the upper ends, respectively. Further, the left and right connecting transverse bars 13, 14 are inserted between the lower ends of the front, rear, left, and right link plate members, and the bases of the cam-shaped holding members 15 are provided at both ends of the connecting transverse bars 13, 14, respectively. Are rotatably mounted on a shaft, and the holding member 15 and the lower end of the connecting arm rod 12 are rotatably mounted on a shaft.

Therefore, a pair of holding width adjusting holes 1 are provided so that the holding claws 15a of the holding member 15 contact the inner wall surface of the U-shaped groove.
6 is selected and the front and rear right link plates 4a, 4b and left link plates 5a, 5b are connected and fixed by adjusting pin bolts 17 to fix the holding width. Then, the lifting tool is lowered into the U-shaped groove, and the lifting tool is lifted after the holding claws 15a of the both holding members 15 abut against the inner wall surface of the U-shaped groove.
The front and rear left and right links 8 and 9 are rotated by the front and rear left and right lifting arms 10 and 11 with the main lifting rod 3 as a fulcrum. Then, by this rotation, the holding claw 15a of the holding member 15 rotates about the connection transverse bar 14 as a fulcrum via the connecting arm rod 12, and the holding claw 15a is further strengthened by the eccentric mechanism of the holding member 15. Is pressed against the inner wall surface of the U-shaped groove to complete the preparation for lifting.

[0008]

However, in the former invention of Japanese Utility Model Laid-Open No. 57-106678, the pressing plates 11, 1
The biting claw 13 fixed to the front surface of the U-shaped groove is lifted by biting into the inner wall surface of the U-shaped groove, so that the inner wall surface of the U-shaped groove may be damaged. 13 is likely to come off, and there is a danger that the U-shaped groove will fall during lifting.

On the other hand, the latter invention disclosed in Japanese Patent Application Laid-Open No. H10-87265 has a very complicated structure, so that the number of failures increases accordingly, and its maintenance and inspection are not easy. Further, in order to lift the U-shaped groove, it is an absolute condition that the holding claw 15a of the holding member 15 is in contact with the inner wall surface immediately before the U-shaped groove. That is, because the holding claw 15a is in contact with the inner wall surface, when the lifting device is lifted, the holding claw 15a of the holding member 15 is connected via the connecting arm rod 12 to the connecting horizontal transfer rods 13, 14. And is pressed outward against the inner wall surface of the U-shaped groove.

Therefore, if the holding claw 15a of the holding member 15 is not fully contacted with the inner wall surface of the U-shaped groove, the holding claw 15a cannot rotate and presses the inner wall surface. Therefore, there is a problem that the lifting operation of the U-shaped groove is not performed. Further, the holding member 1
Since the holding claws 15a are provided on the front surface of the U-shaped groove 5, when the U-shaped groove is lifted up, the inner wall surface may be damaged by biting into the inner wall surface of the U-shaped groove when the U-shaped groove is lifted. There is also a danger that the U-shaped groove will fall during lifting.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and has a simple structure, and is easy and safe to lift. The object of the present invention is to provide a U-shaped groove which does not damage the inner wall surface.

In order to achieve the above object, the gist of the present invention is to form a pair of upper arms rotatably connected to a lifting portion and to each of lower ends of both upper arms rotatably connected to each other. A link mechanism comprising a pair of lower arms that are crossed, a connecting plate pivotally pivotally mounted with the lower ends of the lower arms separated from each other, and provided outside the lower arms. And a press-contact portion, wherein the press-contact portion protrudes outward and presses an inner wall surface of the U-shaped groove by vertical extension deformation of the link mechanism due to its own weight. In the device.

Further, the gist of another invention of the present application is that a pair of upper arms rotatably connected to the lifting section and a pair of U-shaped arms rotatably connected to lower ends of both upper arms, respectively. A link mechanism comprising the lower arms intersecting each other on the protruding side thereof so that the lower intersection is pivotally connected to the lower arm, and And a pressure contact portion provided on the lower outer side, wherein the pressure contact portion protrudes outwardly and presses the inner wall surface of the U-shaped groove by vertical extension deformation due to the weight of the link mechanism. In the lifting device of the U-shaped groove.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the embodiments shown in FIGS. 1 to 6. In the drawings, reference numeral 1 denotes a lifting plate having a predetermined length, and a crane hook or the like is provided at the center thereof. A hanging hole 2 to be inserted is formed. Reference numeral 3 denotes a lifting rod having the same length as the lifting plate 1, which is integrally fixed along the lower end of the lifting plate 1, and constitutes a lifting portion by the horizontally disposed lifting plate 1 and the lifting rod 3. ing.

Reference numeral 4 denotes a link mechanism. A pair of upper arms 5, 5 whose upper ends are rotatably connected to the lifting rod 3, and are rotatably connected to respective lower ends of the upper arms 5, 5. A pair of lower arms 6, 6 and a connecting plate 7 are formed. The pair of lower arms 6, 6 intersect at substantially the center, and their lower ends are separated from each other to the connecting plate 7. A space surrounded by the pair of upper arms 5 and 5 and the pair of lower arms 6 and 6 is formed in a substantially rhombic shape. And
At least two or more of the link mechanisms 4 are installed at predetermined intervals in the axial direction of the lifting rod 3 in accordance with the length of the U-shaped groove B to be lifted. The connecting portion between the upper arm portion 5 and the lower arm portion 4 is rotatably connected by a connecting shaft 9 which is horizontally extended.

Reference numeral 10 denotes a pressure contact portion provided at a predetermined height from the lower end of the lower arm portion 6, and a fixing member 11 fixed substantially orthogonally to the longitudinal direction of the left and right lower arm portions 6; Connecting member 12 rotatably connected to an end of fixed member 11
And a pressure contact member 13 fixed laterally to the distal end of each connecting member 12 and a pressure contact material 14 such as rubber fixed at predetermined intervals outside the pressure contact member 13.

Numeral 15 is a safety bracket for preventing the U-shaped groove B from falling during lifting, and is formed in a U-shape which can be fitted to the outer end of the bottom of the U-shaped groove B. Is fixed with a reinforcing rib 16. Reference numeral 17 denotes a fixing bolt rotatably screwed to the upper surface of the safety bracket 15, and can be securely fixed to the outer end of the bottom surface of the U-shaped groove B by tightening the fixing bolt 17. 18 is the safety bracket 1
5. The rope whose one end is locked to the reinforcing rib 16 of the
The other end of 8 is locked to the end of the lifting plate 1,
The lifting rod 3 is disposed at each of the front and rear ends.
The length of the cable 18 is set slightly longer than the length of the link mechanism 4 when the link mechanism 4 is extended in the vertical direction.

Reference numeral 19 denotes a stopper for temporarily fixing the link mechanism 4 so as not to be inadvertently extended. As shown in FIG. 3 is rotatably pivotally mounted on its lower end, and its lower end has an inwardly-opening locking groove 2 which can be fitted to the connecting shaft 9.
0 is formed. Therefore, the radius of rotation of the stopper 19 is smaller than the radius of rotation of the upper arm portion 5, whereby the extension of the link mechanism 4 can be temporarily fixed. Reference numeral 21 denotes a shock absorber for smoothly expanding and contracting the link mechanism 4 in the vertical direction. As shown in FIG.
Is provided in an upright state between the connecting rod 22 and the connecting rod 22 having a cross section of a chevron shape fixed at the center.

Next, the operation of the above embodiment will be described. The locking groove 20 of the stopper 19 is fitted into the connecting shaft 9 in advance so that the link mechanism 4 does not extend.
As shown in FIG. 3A, the hook F of the crane is engaged with the hanging hole 2 and lifted up, and the U-shaped groove B is lowered into the inside. Next, when the safety bracket 15 is fitted and fixed to the center of the bottom end of the U-shaped groove B, the stopper 19 is fixed.
, So that the link mechanism 4 can be freely extended, and then, as shown in FIG.
Is lifted, the link mechanism 4 is vertically extended and deformed by its own weight.

As a result, the connecting members 12 and the pressing members 13 of the pressing portions 10 provided on the left and right lower arm portions 6 are connected to the pressing members 14.
Abuts against the inner wall surface B1 of the U-shaped groove B so as to be in a substantially horizontal state and protrude in the width direction of the U-shaped groove B, and the press-contact member 14 is strongly pressed against the inner wall surface B1 of the U-shaped groove B. . As a result, a strong frictional force is generated between the pressing member 14 and the inner wall surface B1, and the frictional force causes a heavy U-shaped groove B.
Can be lifted. The pressing member 14
The material is not limited to rubber and any material having a large frictional force is not limited to this.

Here, the force by which the pressure contact portion 10 presses the inner wall surface B1 of the U-shaped groove B is the force by which the lifting plate 1 lifts the inner wall B1. Part 8
According to the ratio of the length from the pressure to the crimping portion 10, the signal is amplified and energized by the so-called leverage principle. Therefore, the press contact portion 1
Since the force by which 0 presses the inner wall surface B1 of the U-shaped groove B increases, the static friction force also increases, so that the heavy concrete U-shaped groove B can be easily lifted.

Furthermore, during the lifting of the U-shaped groove B,
When the U-shaped groove B comes off from the press contact portion 10 and falls, the U-shaped groove B is locked by the safety fitting 15 fitted and fixed to the front and rear outer ends of the bottom surface of the U-shaped groove B and the end of the lifting plate 1. Cable 18
And it is lifted. Therefore, the danger of the U-shaped groove B colliding with the ground is prevented, and the safety of the worker is assured, and the U-shaped groove can also be prevented from being damaged.

FIG. 7 and FIG. 8 show another embodiment of the apparatus of the present invention. This link mechanism 4 is composed of a pair of upper arm portions 5 and lower arm portions 6 in the same manner as in the previous embodiment. Part 5
Is rotatably pivoted to the lifting rod 3,
The lower arm 6 has an upper half 6a and a lower half 6b which are bent and connected approximately 90 ° in a “U” shape, and the lower arms 6 are opposite to each other (the bent portions face each other). State). The lower crossing portion of the upper and lower crossing portions, that is, the crossing portion of the left and right lower halves 6b is rotatably connected by a connecting shaft 23. A pressing member 11a is fixed to a lower portion of the lower half 6b, and a pressing member 14 is fixed to an outer surface thereof. A plurality of such link mechanisms 4 are provided according to the length of the U-shaped groove B,
Is rotatably mounted on the body.

Then, as shown in FIG. 8A, when the link mechanism 4 installed in the U-shaped groove B is lifted by the hook F, the link mechanism 4 extends vertically by its own weight.
As a result, as shown in FIG. 8B, the pair of upper arms 5 and the lower arms 6 extend in the vertical direction, respectively, and the lower half 6b of the lower arm 6 has the connection shaft 23 as a fulcrum. To expand horizontally. When the lower half 6b of the lower arm 6 expands in the horizontal direction, the pressing member 11a and the pressing member 1
4 is strongly pressed against the inner wall surface B1 of the U-shaped groove B, and can be lifted.

[0025]

The lifting device for a U-shaped groove according to the present invention comprises:
With the above configuration, (1) it is composed of a combination of simple members, has a simple structure, can be manufactured at low cost, and has few failures and is easy to maintain and inspect. It is. (2) The heavy U-shaped groove made of concrete can be lifted by a simple operation without fail, and the work efficiency and safety are improved, and the inner wall surface of the U-shaped groove is not damaged. (3) By providing the safety fitting and the cable, the fall of the U-shaped groove is prevented, and the breakage of the U-shaped groove can be reliably prevented. (4) Since there is no need to excavate soil more than the width of the U-shaped groove, various effects such as a small amount of discharged soil and an easy excavation and backfilling operation can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a lifting device according to the present invention.

FIG. 2 is a front view of the same device.

FIG. 3 is a side view showing the device before and during operation.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a sectional view taken along line VV of FIG. 2;

FIG. 6 is a perspective view of a main part showing a use state of the safety fitting.

FIG. 7 is a perspective view of another embodiment of the lifting device.

FIG. 8 is a side view showing the apparatus before and during operation.

FIG. 9 is a perspective view of a conventional lifting device.

FIG. 10 is a perspective view of another conventional lifting device.

[Description of Signs] 1 Lifting plate 3 Lifting rod 4 Link mechanism 5 Upper arm 6 Lower arm 6a Upper half 6b Lower half 7 Connecting plate 8 Pivot 9 Connecting shaft 10 Pressure contact portion 13 Pressure contact member 14 Pressure contact material 15 Safety fitting 18 Rope

Claims (7)

[Claims] A pair of upper arms rotatably connected to the lifting portion; a pair of lower arms rotatably connected to lower ends of the upper arms so as to intersect with each other; A link mechanism comprising a connecting plate rotatably pivoted with the lower ends of both lower arms separated from each other, and a pressure contact portion provided outside the both lower arms, and a weight of the link mechanism. The lifting device for a U-shaped groove, wherein the pressing portion protrudes outwardly and presses the inner wall surface of the U-shaped groove due to the vertical extension deformation of the U-shaped groove. 2. The pressure contact member according to claim 1, wherein the pressure contact portion comprises a pressure contact member rotatable with respect to the lower arm portion, and a rubber pressure contact member provided at a predetermined interval on the pressure contact member. U-shaped groove lifting device. 3. The lifting device for a U-shaped groove according to claim 1, wherein the pressure contact portion is provided at a predetermined height from the lower end of the lower arm. 4. A safety fitting which can be fitted to the front and rear outer ends of the bottom surface of the U-shaped groove, wherein the safety fitting is connected to the lifting part by a cable which is slightly longer than the length of the link mechanism when it is extended. The lifting device for a U-shaped groove according to claim 1, 2 or 3. 5. A vehicle comprising: a pair of upper arms rotatably connected to a lifting portion; and a pair of U-shaped lower arms rotatably connected to lower ends of both upper arms, respectively. A link mechanism in which the lower arms cross each other on the protruding side thereof and the lower intersection is pivotably connected to the lower arm, and a press contact portion provided on the lower outer side of the lower arms. The lifting device for a U-shaped groove, wherein the pressing portion protrudes outwardly and presses the inner wall surface of the U-shaped groove by vertical extension deformation of the link mechanism due to its own weight. 6. The U-shaped groove according to claim 5, wherein the pressure contact portion comprises a pressure contact member fixed to the lower arm portion and a rubber pressure contact member provided at a predetermined interval on the pressure contact member. Lifting equipment. 7. A safety fitting which can be fitted to front and rear outer ends of the bottom surface of the U-shaped groove, wherein the safety fitting is connected to the lifting part by a cable which is slightly longer than a length of the link mechanism when extended. The lifting device for a U-shaped groove according to claim 5 or 6.