JPH0283190A - Gripping device for part and the like - Google Patents

Abstract

PURPOSE:To hold a part, etc., and to enlarge the objective range of a sealable part by forming the inner diameter of the tube expanding face press-fitting by expansion to a part, etc., so as to differ at least at two places. CONSTITUTION:In case of gripping a part 10 of small outer diameter, it is inserted to the place where the inner diameter of the expansion face of a rube 2 is small, the fluid of air, etc., is poured from a fluid pouring path 4 at this place and the sealing property is held at the place where the expansion face of the tube 2 is press-fitted to the part 10. Also in case of holding and sealing a part 11 of a large outer diameter, the inner diameter place positive part 11 of the tube 2 matched to the outer diameter of the part 11 is gripped.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for attaching a tube so as to expand inside the inner circumferential surface of a cylindrical hard body, and attaching the tube and the inner circumference of the hard body to the hard body. This invention relates to a device for grasping components, etc., which forms a fluid injection path for injecting fluid into a sealed space formed by a surface of the tube, and grasps the components with the expanded surface of the tube.

[Conventional technology]

A conventional gripping device of this type is known as described in Japanese Patent Laid-Open No. 63-7289. As shown in FIG. 8, a tube 101 is attached so as to expand inside the inner circumferential surface of a cylindrical hard body part 100.
A fluid injection path 1°2 for injecting fluid into the sealed space formed by the tube 101 and the inner circumferential surface of the hard main body 100 is formed in the tube 101, and the expansion surface of the tube 101 grips parts, etc. This is what I did. In such a conventional gripping device, the distance Mr between the expanded surfaces of the tube 101 is called the inner diameter, as shown in FIG.

[Problem to be solved]

Conventional gripping devices can grip most parts, etc., as long as they are smaller than the inner diameter r, but depending on the type of parts, etc. to be gripped, they may not only have this gripping function but also sealing properties when gripped. may be required,
If the outer diameter of the parts etc. is very small compared to the inner diameter r of the tube 101, as shown in FIGS. 10 and 11,
There was a problem in that the tube 101 was deformed while causing wrinkles, thereby impairing the sealing function.

Therefore, the present invention provides a sealing function that could only be exerted on parts with a predetermined outer diameter, but only on parts with a predetermined outer diameter, for parts smaller than the inner diameter of the tube. To provide a device for grasping parts, etc., which can exhibit a holding function and a sealing function, and can widen the range of target parts, etc. that can be grasped.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention is configured such that the inner diameters of the tube expansion surfaces that expand and come into pressure contact with parts etc. are different in at least two places. Further, the inner diameter of the tube inflation surface was formed into a tapered shape such that it gradually becomes smaller from the side where the parts etc. are inserted toward the opposite side.

[Effect]

In this invention, when inserting parts etc. into the tube,
By inserting the tube to the point where the inner diameter of the tube expansion surface is optimal according to the outer diameter of the part, etc., when fluid is injected into the tube and the part is clamped, it not only has a holding function but also a sealing function. Demonstrate.

〔Example〕

Preferred embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, the tube 2 is attached so as to expand inside the inner circumferential surface of the cylindrical hard body part l, and the tube 2 and the inner circumferential face of the hard body part l form a sealed seal. A fluid injection path 4 for injecting fluid into the space 3 is formed. The tube 2 is attached by folding the upper end side from the inside to the outside of the hard main body part 1, and firmly attaching the folded part with a crimping ring 5 to prevent fluid from leaking.

Similarly, the lower end side of the tube 2 is folded back from the inside to the outside of the lower end side of the hard body part 1 and attached using a crimping ring 6. The hard main body portion 1 may be made of metal or plastic material. Also, in this example,
The hard main body 1 has a shape in which the head of a cone is cut off, with a larger inner diameter on the lower end side and a smaller inner diameter on the upper end side.

Further, the crimping ring 5.6 has a straight shape so that the tube 2 can be easily attached. The tube 2 attached to such a hard main body 1 has a tapered shape such that the inner diameter of the tube expansion surface that expands and presses against the rear part etc. gradually decreases from the lower end side to the upper end side. There is.

For attachment to the rigid main body l as shown in FIG. 1, the shape of the front tube 2 as shown in FIGS. 2 to 5 can be adopted. The tube 2 shown in FIG. 2 has a tapered shape, the tube 2 shown in FIG. 3 has both ends straight, and the tube 2 shown in FIG. 4 has both ends bent easily from the inside to the outside. It is formed from the beginning so that both ends open outward.

The tube 2 shown in FIG. 5 is a straight type having the same inner diameter, and ribs 2A are formed on the outside of both ends of the mounting location in order to improve the sealing performance of the space 3.

The case where parts 1O111 with different outer diameters are gripped by the gripping device as explained above will be explained based on FIGS. Insert the component 10 up to this point, inject fluid such as air from the fluid injection path 4 at this point to inflate the tube 72 and grab the component 10, and seal the part 10 at the point where the expanded surface of the tube 2 comes into pressure contact with the component 10. The fluid A can be injected into the flow path forming member 7 through the component 1o while maintaining the same. Alternatively, it is also possible to flow the fluid A from the flow path forming member 7 side to the component 1o. FIG. 7 shows a case in which a part 11 having a large outer diameter is held and sealed; in this case, the part 11 is gripped at a point on the inner diameter of the tube 2 that corresponds to the outer diameter of the part 11.

In the above-described embodiment, the inner diameter of the tube 2 is formed into a tapered shape, but if the inner diameter of the tube 2 differs at least in two or more places, it is possible to hold and seal parts having at least two different outer diameters. . Further, although both ends of the tube 2 are folded back and attached to the hard body part 1, it is not necessarily necessary to fold them back and attach them. When using a tapered tube as shown in the embodiment, it goes without saying that the range of sizes of parts that can be held and sealed is wide.

〔effect〕

As explained above, according to the present invention, since the inner diameter of the tube expansion surface that expands and comes into pressure contact with a component is configured to be different in at least two places, the component can be held and sealed. The scope becomes wider. Further, the range of application is further expanded if the inner diameter of the tube expansion surface is formed into a tapered shape that gradually decreases from the side into which a component or the like is inserted toward the opposite side.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a preferred embodiment of the present invention, FIGS. 2 to 5 are cross-sectional views showing various examples of the tubes used in the present invention, and FIGS. 6 and 7 are 8 is a sectional view showing the conventional example, FIG. 9 is a plan view of the conventional example, and FIG. 10 explains the disadvantages of the conventional example. FIG. 11 is a sectional view of FIG. 10. ■...Hard main body, 2...Tube, 3...Space, 4...Fluid injection path. Applicant Brideston Co., Ltd. Agent Patent Attorney Masu 1) Takeo 7vA No. BvA No. 9 Fig. 2 Fig. 3 Ta Fig. M4 Fig. 315 Fig. 11 Fig. Fig.

Claims (1)

[Claims] 1. A tube is attached to the inside of the cylindrical hard body so as to expand inside the inner circumferential surface of the hard body, and the tube is attached to the hard body in a sealed space formed by the tube and the inner circumference of the hard body. In a gripping device for parts, etc., which forms a fluid injection path for injecting fluid and grips parts, etc. with the expanded surface of a tube, the inner diameter of the expanded surface of the tube that expands and comes into pressure contact with the component, etc. is at least two places. A device for grasping parts, etc., which has different characteristics. 2. The device for grasping parts and the like according to claim 1, wherein the inner diameter of the tube expansion surface is formed in a tapered shape such that it gradually becomes smaller from the side where the part or the like is inserted toward the opposite side.