JP3026155U - Air jack device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an air jack device that can be inserted into a narrow gap. [Structure] A tube 2 that is air impermeable and has flexibility and is filled with compressed air, and an outer bag 3 that has abrasion resistance, flexibility, and burst resistance, and that stores the tube. In the bag, the overlapping portion 7 of the rolled sheet is welded and the opening portion is crimped by the pair of metal plates 9a and 9b to screw 1
It is fixed by 0 and is formed into a flat bag body.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air jack device that can be inserted into a narrow gap and lift a heavy object.

[0002]

[Prior art]

 An air jack device for injecting air into a rubber air-sealed tube to inflate it and lifting the heavy object by utilizing the expanding force is known (for example, Japanese Patent Publication No. 55-223 99 and Japanese Patent Laid-Open No. 57-57-). No. 9698). These publications disclose a structure in which a plurality of rubber sheets are superposed and a steel cord or a fiber cord is wound between the rubber sheets to reinforce them.

[0003]

[Problems to be solved by the device]

 The air jack device disclosed in the above publication is intended to move or lift a heavy load of several tons, and is designed to have an extremely sturdy structure. Therefore, it is necessary to have a thickness of at least about 3 cm, and it is not possible to lift heavy objects by inserting them into a narrower gap.

The present invention has been made to solve such a problem, and provides an air jack device that can be inserted even in a narrow gap of about 1 to 2 cm.

[0005]

[Means for Solving the Problems]

 The present invention accommodates a tube formed of a sheet having air impermeability and flexibility and having an air joint, and the tube having abrasion resistance, flexibility and burst resistance. In addition, an outer bag having a hole for exposing the air joint to the outside is provided, and the outer bag is made of a sheet wound in a roll shape, and the overlapping portion is welded and the opening portion has a pair of openings. It is formed into a flat bag body by being crimped and sealed with an elongated metal plate.

In the present invention, the tube is formed of a polyurethane sheet or a sheet of nylon woven cloth coated with polyurethane on the inner surface, and the sheet constituting the outer bag is coated on both sides with polyurethane. It may be formed of a woven fabric of polyester fiber, nylon fiber or aramid fiber.

[0007]

[Action]

 In the structure according to claim 1, compressed air is injected into the tube from an air joint to expand the tube. As the tube expands, the flexible outer bag expands. The outer bag is formed by winding the sheet in a roll shape, welding the overlapping part of the sheet ends, and sandwiching and crimping the opening part with a long thin metal plate. It is at most 2-3 mm, and the total thickness including the tube is set to 1 cm or less.

In the configuration according to the second aspect, when the tube is formed of a polyurethane sheet or a sheet in which the inner surface of a nylon woven cloth is coated with polyurethane, the durability of the tube is improved. Further, when the outer bag is formed of a woven fabric of polyester fiber, nylon fiber or aramid fiber whose both surfaces are coated with polyurethane, abrasion resistance and burst resistance are improved.

[0009]

【Example】

 1 to 4, reference numeral 1 denotes an air jack device having a length of about 15 cm, a width of about 50 cm, and a thickness of about 5 mm, which includes a tube 2 and an outer bag 3. The tube 2 is a rectangle (40 cm long, 60 cm wide) that is folded in half into a square (40 cm long, 60 cm wide) polyurethane sheet with a thickness of about 0.4 mm. It is formed into a sealed body with a thickness of 0.8 mm. Reference numeral 4 indicates a welded portion on these three sides. 5 is an air joint attached to one side (folded portion) that is not welded. A urethane sheet is impermeable to air and excellent in flexibility, and thus is suitable as a material for this kind of tube. Instead of the urethane sheet, a sheet in which the inner surface of nylon woven cloth, that is, the inner surface of the tube is coated with polyurethane can be used. Nylon woven fabric has the properties of being impermeable to air and flexible, and has high mechanical strength, so that when it is used, the durability of the tube can be further improved. Further, since the surface of the nylon woven fabric is slippery, even if the outer bag 3 is deformed by an external force, the tube 2 slips, and the force is not locally concentrated, and the shape is kept reasonably. This action also contributes to the improvement of the durability of the tube 2.

As the outer bag 3, a woven sheet of polyester fiber, nylon fiber or aramid fiber, both surfaces of which are coated with polyurethane, is used. The size of this sheet is 62 cm in length, 50 cm in width, and 0.7 mm in thickness, and it is wound twice in a roll shape, and about 2 cm at both ends overlap each other, so that only this part is tripled. This overlapping portion 6 is welded by a high frequency welder. The two openings 7 and 7 of the rolled sheet are sandwiched by a pair of elongated metal plates 9a and 9b having screw holes 8 and 8 ... To be done. The dimensions of each of the metal plates 9a and 9b can be, for example, 15 mm in length, 140 mm in width, and 1 mm in thickness. 11, 11 ... are screw holes formed in the outer bag 3, and 12 are holes through which the air joint 5 is taken out. The tube 2 is mounted from the opening portions 7, 7 before the opening portions 7, 7 are closed by the metal plates 9a, 9b.

FIG. 5 shows the structure of the air joint 5 part, and 13 is a bolt adhered to the tube 2 via washers 14, 14 and polyurethane-coated polyester woven sheet 15, 15, and the air joint 5 is The bolt 13 is sealed with a sealing tape and screwed.

FIGS. 6 and 7 show an example of use of the air jack device 1, in which 16 is a bridge, 17 is a bridge girder, and 18 is a vibration damper made of a laminated body of rubber and a metal plate interposed therebetween. The thickness of rubber is about 16 cm when compressed. Most of the weight of the bridge 16 is supported by the vibration damping rubber 18. Numeral 19 is a metal pillar having a diameter of about 5.5 cm fixed vertically between the bridge 16 and the bridge girder 20, and 20 is a block surrounding the pillar 19, which is fixed to the bridge 16 side with an adhesive 21. The columns 19 serve to prevent the bridge 16 from being displaced. Normally, the bridge 16 moves about 4.8 cm per 100 m with respect to the bridge girder 17 due to thermal expansion. Therefore, the column 19 is structured so that it can be slightly moved with respect to the bridge girder 17 while maintaining the vertical position. The illustration of the structure is omitted. The bridge 16, bridge girder 17, and block 20 are made of concrete. The block 20 protects the support column 19, and a space of about 2 to 3 cm is provided between the lower end of the block 20 and the bridge girder 17. Since the block 20 moves with respect to the bridge girder 17 as described above, it is necessary to separate the two.

In such a structure, the block 20 may be damaged by vibration of the bridge 16 or the like. Therefore, this block 20 needs to be replaced each time it is damaged. In such an operation, two new blocks 20 and 20 are prepared, and the columns 19 are sandwiched between them, and the blocks are pressed and fixed to the bridge 16 by the adhesive 21. At the time of this bonding operation, a gap must be opened at the lower end of the block 20, and this must be maintained in a state of being pushed upward until the adhesive 21 hardens. The air jacks 1, 1 are inserted into this gap. At the time of use, the air joint 4 is connected to the air hose 22, and is connected to the air compressor (not shown) via the valve 23 to supply compressed air to the air jack.

Table 1 shows the air pressure-lift characteristics of the air jack 1 according to the embodiment. It can be seen from this table that a maximum weight of about 1 ton can be lifted by 35 mm. In this case, the air jack device 1 is used with its internal pressure in the range of 1.0 to 3.0 kg / cm ² . Since each block 20 has a weight of about 50 kg, the block 20 can be sufficiently supported by the air jack device 1.

[0015]

[Table 1]

[0016]

[Effect of device]

 The air jack device according to the present invention is formed by a rolled sheet, and the overlapping portions of the sheets are welded, and the opening portion of the rolled sheet is pressure-bonded with a pair of metal plates to form a bag body. Since it is an outer bag, the thickness can be reduced to 1 cm or less when the tube is accommodated in the outer bag to form a flat body. Therefore, it can be inserted into a narrow gap of about 1 to 2 cm, and the application can be expanded to areas where it could not be used conventionally.

In the present invention, the tube is formed of a polyurethane sheet or a sheet of nylon woven cloth coated with polyurethane on the inner surface, and the outer bag is polyester fiber, nylon fiber or aramid coated on both sides with polyurethane. Abrasion resistance and burst resistance are improved when formed from any woven sheet of fibers.

[Brief description of drawings]

FIG. 1 is a perspective view of an air jack device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a perspective view showing a tube.

FIG. 4 is a perspective view for explaining the manufacturing of the outer bag.

FIG. 5 is a cross-sectional view showing an air joint portion.

FIG. 6 is a cross-sectional view showing a usage state.

FIG. 7 is a top view showing a usage state.

[Explanation of symbols]

 1 ………… Air jack device 2 ………… Tube 3 ………… Outer bag 5 ………… Air joint 6 ………… Overlapping part 7 ………… Opening part 8 ………… Hole 9a, 9b ……… Metal plate 10 ……… Screw 16 ………… Bridge 17 ………… Bridge girder 19 ………… Staff 20 ………… Block

Claims (2)

[Scope of utility model registration request] 1. A tube formed of a sheet having air impermeability and flexibility and having an air joint, and a tube having abrasion resistance, flexibility, and burst resistance, and containing the tube. An outer bag having a hole for exposing the air joint to the outside is provided, and the outer bag is made of a sheet wound in a roll shape, and the overlapping portion is welded and the opening portions are each a pair of elongated metal pieces. An air jack device characterized by being formed into a flat bag body by being crimp-sealed with a plate. 2. A polyester fiber in which the tube is formed of a polyurethane sheet or a sheet of nylon woven cloth coated with polyurethane on the inner surface, and the sheet constituting the outer bag is coated on both sides with polyurethane. The air jack device according to claim 1, wherein the air jack device is formed of a woven fabric of nylon, nylon fiber or aramid fiber.