JPH0643109Y2 - Hollow body for lifter - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention compresses into a hollow body made of a flexible airtight sheet material used as a lifter, for example, for lifting and unloading luggage, an air jack for bicycles, and the like. The present invention relates to a hollow body for a lifter, which uses compressed gas to inject and discharge gas to expand and contract the hollow body.

(Prior Art) Conventionally, as a lifter such as an air jack, a flexible airtight sheet material, for example, a rubber-lined cloth or a vinyl chloride sheet is pasted to form a hollow balloon having a cylindrical or conical shape. There is. That is, this balloon has a hollow body formed by rolling one rubberized cloth into a tubular shape, adhering the overlapping portions at both ends thereof, and adhering the closing members to both open ends of the tubular body. (For example, see Japanese Utility Model Publication No. 55-143296).

(Problems to be solved by the invention) By the way, in the tubular body, one rectangular rubberized cloth is rolled into a cylindrical shape and one overlapping portion is bonded, and a reinforcing rubberized rubber is applied inside the bonded portion. Since the cloth is bonded, there is only one bonded part in the circumferential direction of the tubular body having a strength several times higher than other parts, and the axial extension of this bonded part is the tubular body. Is smaller than the axial extension of the other part of.

Therefore, when the tubular body is inflated, the tubular body is subjected to an eccentric load at one circumferential position due to the tensile force acting on the adhesive portion in a direction parallel to the axis, and therefore, the tubular body is inflated when inflated. Buckling is likely to occur, and it may not be possible to properly hold the article in a raised state.

SUMMARY OF THE INVENTION In view of such circumstances, an object of the present invention is to provide a lifter hollow body that can average the pulling force generated in a tubular body when inflated and can appropriately hold the lifted state of an article.

(Means for Solving the Problems) In order to achieve the above object, the present invention has taken the following technical means.

That is, the hollow body for a lifter according to the present invention comprises a tubular body 2 made of a flexible airtight sheet material and having axially open ends, and a closing lid for airtightly closing the openings at both ends of the tubular body 2. In the lifter hollow body including the portion 4, the tubular body portion 2 is formed by joining a plurality of sheet materials 2a having the same circumferential length to each other at their circumferential ends. 6 are arranged at equal intervals in the circumferential direction of the tubular body 2.

(Operation) In the present invention, the tubular body 2 is formed by joining a plurality of sheet materials 2a having the same circumferential length to each other at their circumferential ends, and the joining portion of the sheet materials 2a having relatively high strength is tubular. Since they are arranged at equal intervals in the circumferential direction of the body 2, the portions where a tensile force in the direction parallel to the axis is generated at the time of expansion of the tubular body 2 are arranged at equal intervals in the circumferential direction of the tubular body 2. As a result, the tensile forces generated in the tubular body portion 2 at the time of expansion are averaged.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show a first embodiment of the present invention.
Is a hollow body used for lifters, air jacks, etc., and is composed of a tubular body 2 made of a flexible airtight sheet material such as rubberized cloth or vinyl chloride sheet, and a rigid material such as metal, synthetic resin or wood. It is configured by the closing lid portions 4 and 4 having the joining member 3.

The tubular body portion 2 is configured by bonding a plurality of (three in this embodiment) sheet materials 2a having the same circumferential length to each other at their peripheral ends.
The peripheral ends of 2a are adhered to each other via a strip-shaped reinforcing / joining sheet 5.

The joint portion 6 of the tubular body portion 2 may be mounted by overlapping the ends thereof, and the sheet 5 may be adhered to the inside of the adhering portion for reinforcement.

Then, in this embodiment, the joint portion 6 of the tubular body portion 2 is thus formed.
By arranging a plurality of portions at equal intervals, the expansion of the tubular body portion 2 is averaged over the entire circumference, and the distortion can be corrected.

Each of the closing lids 4, 4 is provided with a ring-shaped joining member 3 which is disk-shaped and concentrically protrudes from one side surface thereof, and the joining member 3 is fitted into both end openings of the tubular body 2. They are joined together and joined with an adhesive or the like. Since the closing lid portion 4 has a three-dimensional shape with the joining member 3, the work of adhering the tubular body portion 2 to the joining member 3 is extremely easy, and the shape of the hollow body 1 during expansion is taken into consideration. You can work without it.

Further, since the closing lid portion 4 is made of a rigid material, it is not necessary to separately provide a base or a supporting top plate, and the closing lid portion 4 can be shared as a base or a top plate. You can also connect.

The pneumatic tube may of course be provided in the tubular body 2, and stoppers (not shown) such as cords may be provided between the peripheral edge portions of the upper and lower closing lids 4 to provide the tubular strip. The body 2 can also be protected.

FIG. 4 shows a first modified example of the cross-sectional shape of the joining member 3, which is different from the first embodiment in that it is a separate body from the closing lid portion 4. In the first modified example, the closing is performed. The lid portion 4 is fixed or adhered to the inward flange 3A and the outward flange 3B protruding inward and outward of the joining member 3. The closing lid portion 4 can be formed of a rigid material together with the joining member 3, but the same sheet material as that of the tubular body portion 2 can be used. The joining member 3 and the tubular body 2
Adhesion to and is the same as in the first embodiment, and like the first embodiment, it is possible to perform work while maintaining the three-dimensional shape even at the time of joining.

FIG. 5 shows a second modified example of the cross-sectional shape of the joining member 3, which is molded integrally with the closing lid part 4 by a rigid material, and differs from the first embodiment in that the outer circumference of the closing lid part 4 is different. The rest is the same as the first embodiment except that the collar portion is not provided.

FIG. 6 shows a third modified example of the cross-sectional shape of the joining member 3, which has a ring shape which is separated from the closing lid portion 4 and is independent.
The tubular body 2 and the closing member 4 are adhered to the inner circumference or the outer circumference of the ring-shaped joining member 3. The joining member 3 may be made of a rigid material, and the closing lid 4 may be made of the same sheet material as the tubular body 2 or the same rigid material as the joining member 3.

FIG. 7 shows a fourth modification of the cross-sectional shape of the joining member 3, in which an inward flange 3A is provided at the end of the joining member 3 in the third modification, and the closing lid 4 is provided on the inward flange 3A. It is designed to be glued or fixed.

FIG. 8 shows a fifth modified example of the cross-sectional shape of the joining member 3, in which an outward flange 3B is projectingly provided at the end of the joining member 3 in the third modified example, and the closing lid portion 4 is provided on the outward flange 3B. It is designed to be glued or fixed.

FIG. 9 shows an essential part of a second embodiment of the present invention. As in the first embodiment, the cylindrical body 3 is provided with circumferential joints 6 at three positions at equal intervals, and the shaft The joining portion 7 is also provided in the central portion in the direction, and the reinforcing sheet 5 is adhered to the inner side. By increasing the strength of the hollow body 1 and correcting the distortion, the life can be extended.

In addition to the above-mentioned embodiments, particularly when the hollow body has a conical shape as shown in FIG. 10, when the body portion 2 is made of one rubberized cloth, the fiber directions in the rubberized cloth are mixed, In this case, it is particularly effective to use a plurality of joints of the body portion 2 because the strain increases. The cylindrical body 2 is not limited to the circular cross section.

(Effects of the Invention) According to the present invention, when the tubular body 2 is inflated, portions where a tensile force in a direction parallel to the axis is generated are distributed at equal intervals in the circumferential direction of the tubular body 2, and Since the tensile force generated in the tubular body portion 2 is averaged, it is possible to effectively prevent buckling of the tubular body portion 2 during expansion, and thus it is possible to properly hold the article in a raised state. .

[Brief description of drawings]

1 to 3 show a first embodiment, FIG. 1 is an overall perspective view, FIG. 2 is an exploded perspective view, and 3 is a central longitudinal sectional view. 4 to 8 are cross-sectional views showing modified examples of the joining member, FIG. 9 is a perspective view of a cylindrical body which is an essential part of the second embodiment, and FIG. 10 is a view of the cylindrical body. It is sectional drawing which shows another modification. 1 ... Hollow body, 2 ... Cylindrical body, 2a ... Sheet material, 3
...... Joining member, 4 ...... Closure lid part.

Claims (1)

[Scope of utility model registration request] 1. A tubular body (2) made of a flexible airtight sheet material and having both axial ends opened, and the tubular body (2).
A hollow body for a lifter having a closing lid part (4) for airtightly closing both end openings of the tubular body part (2), wherein the tubular body part (2) is made of a plurality of sheet materials (2a) having the same circumferential length. Hollow body for lifter, characterized in that the sheet materials (2a) are joined to each other at their peripheral edges, and the joint portions (6) of the sheet material (2a) are arranged at equal intervals in the circumferential direction of the tubular body portion (2). .