JP2531751Y2 - Power jack - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic jack.

[0002]

2. Description of the Related Art A power element used for excavating a rock or the like is proposed in Japanese Patent Application Laid-Open No. 62-101797. In this method, two expanding thrust members arranged on the outer side of a rubber tube that expands are pushed out through a wedge. The rubber tube is inserted into a hole formed in the rock, and the rubber tube is hydraulically expanded to expand the rock. Is to be crushed.

[0003]

SUMMARY OF THE INVENTION The object of the present invention is to construct a small, lightweight and large-capacity hydraulic jack using such a power element.

[0004]

SUMMARY OF THE INVENTION The present invention provides two thrust members having arcuate cross sections arranged to face each other so as to form a substantially cylindrical shape, and a hollow portion formed inside these thrust members. A rubber tube disposed in the axial direction, two wedges disposed at symmetrical positions where the rubber tube intrudes between the thrust members and expands the thrust member, and a rubber tube for expanding the rubber tube A power element composed of a hydraulic pipe connected to the holder is housed inside a holder that is configured to freely expand and contract in the driving direction of the thrust member, and a plurality of the holders are stacked.

[0005]

Since these members are not used in comparison with a conventional hydraulic jack using a cylinder, a piston, a piston rod and the like, the size and the weight are smaller than the capacity.

In addition, the stroke amount can be arbitrarily set according to the number of power elements to be stacked. In addition, since it is sufficient to carry each power element, even a large-capacity jack can be easily moved manually without using mechanical force. can do.

[0007]

1 to 4 show an embodiment of the present invention.

FIGS. 1 and 2 show the structure of a power element. Reference numeral 1 denotes two thrust members having an arc-shaped cross section, which are disposed to face each other so as to form a cylindrical shape.
At both ends, they are bound by rubber bands 9 and are supported from inside by two wedges 4 as shown in FIG. A rubber tube 5 is provided between the wedges 4.

Both ends of the rubber tube 5 are mounted on the outer periphery of the enlarged diameter portion 6A having the tapered surfaces of the joint tube 6 on both sides so as to cover the tapered surface, and a bush 8 fitted to the outer periphery of the rubber tube 5; 8 is screwed into the enlarged diameter portion 6A from both sides in the axial direction by a bush 7 which is screwed into the end of the joint tube 8 and fitted to the outer periphery of the joint pipe 6. The maximum diameter of the enlarged diameter portion 6A is set to be larger than the outer diameter of the rubber tube 5.

The contact portion of the bush 8 with the rubber tube 5 is formed in the same tapered shape as the enlarged diameter portion 6A. Further, a taper ring 10 as a pressing member is interposed between the bush 7 and the rubber tube 5. The tapered ring 10 has the same tapered surface as the bush 8, is fitted on the outer periphery of the joint pipe 6, and is displaced in the axial direction toward the enlarged diameter portion 6 </ b> A according to the rotation of the bush 7. Reference numeral 11 denotes a lock nut for regulating the relative rotation of the bushes 7 and 8.

One of the joint pipes 6 connected to both ends of the rubber tube 5 is connected to a hydraulic supply pipe 14 via a cap 12 screwed to the outer periphery of the bush 7, and the other joint pipe 6 is connected by a cap 13. Sealed.

The tip of the bush 8 is connected to the thrust member 1.
Is fitted together with a Teflon washer 15 and a washer 16 having a wedge-shaped cross section to be fitted on the outer periphery of the rubber tube 5 inside an annular groove 17 formed on the inner periphery of the rubber tube 5. Thereby, the axial displacement of the thrust member 1 is regulated. The Teflon washer 15 bites between the bush 8 and the washer 16 due to the expansion of the rubber tube 5 and pushes the washer 16 toward the thrust member 1 so that the rubber tube 5 bites between the annular groove 17 and the washer 16. Prevent being caught.

At the center of both ends of each thrust member 1, a projection 2 projecting in the axial direction is formed. The projections 2 are slidably fitted inside guides 3 formed on the bush 8 at intervals of 180 °. Thus, the opposing thrust member 1 is displaced in the cross-axis direction while maintaining the facing state without causing one-sided opening due to expansion of the rubber tube 5. 3 and 4 show the configuration of the power jack. The power jack is such that a pair of holders 20 each having an outer peripheral portion having a rectangular cross section are fitted to the outer periphery of the thrust member 1 of the power element as shown in FIG.
The power element is configured to extend and contract integrally with the thrust member 1, and a plurality of power elements are stacked via the holder 20 in the direction of expansion and contraction.

A pin groove 21 having a semicircular cross section is formed on the upper and lower surfaces of the holder 20. This pin groove 21 is
Are stacked, a hole having a circular cross section is formed, and the pin 22 is inserted into the hole to function as a horizontal stopper for the holder 20.

Next, the operation will be described.

When this power jack is used, a required number of power elements are vertically stacked via a holder 20 and interposed between the base and the jack-up symmetrical object. Insert the pin 22 into the.

When hydraulic pressure is supplied to the rubber tubes 5 of the respective power elements via the hydraulic pressure supply pipe 14, the expanding rubber tubes 5 cause the wedges 4 to bite between the thrust members 1 and move the thrust members 1 in the separating direction. Drive.
As a result, as shown in FIG. 4, each holder 20 is also driven in the same direction, and the power jack supports the jack-up symmetrical object and moves up and down by a distance equal to the product of the moving distance of each holder 20 and the number of power elements. Stretch in the direction. Even when the load due to the jack-up target does not act evenly on the holder 20, the displacement of the holder 20 is regulated by the pins 22 inserted into the holes formed by the pin grooves 21, so that the jack-up operation can be performed stably.

The jack-up height can be arbitrarily adjusted by the amount of pressurized oil supplied to each power element. Alternatively, it can also be adjusted by the number of power elements that supply pressure oil.

When the oil pressure inside the power element is released, the power element and the holder 20 are both contracted to their original positions.

Since the holders 20 are not fixed, it is preferable that the power element is contracted after the jack-up operation, and the power elements are separated and transported one by one.
For this reason, even when a large-capacity jack is required, the jack can be easily transported and installed by human power.

Also, An arbitrary jack-up height can be obtained by selecting the number of power elements to be stacked.

[0022]

As described above, according to the present invention, a plurality of power elements are stacked in the direction of expansion and contraction via the holder, so that separation and assembly are easy, an arbitrary jack-up amount can be obtained, and a large amount can be obtained. Even when a capacity jack is required, it can be easily moved and installed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a power element used in a power jack according to an embodiment of the present invention.

FIG. 2 is a transverse sectional view of the same.

FIG. 3 is a perspective view of the power jack in a contracted state.

FIG. 4 is a perspective view of the power jack in an extended state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thrust member 4 Wedge 5 Rubber tube 14 Hydraulic supply pipe 20 Holder

Claims (1)

(57) [Scope of request for utility model registration] 1. A thrust member having an arcuate cross-section disposed to face each other so as to form a substantially cylindrical shape, and a thrust member disposed axially in a hollow portion formed inside the thrust member. From a rubber tube, two wedges disposed at symmetrical positions where the rubber tube digs between the thrust members and expands the thrust member, and a hydraulic pipe connected to the rubber tube to expand the rubber tube. A power jack, wherein a power element is housed inside a holder which is configured to freely expand and contract in the driving direction of the thrust member, and a plurality of the holders are stacked.