JPH0441131A - Seal ring installation device - Google Patents

Abstract

PURPOSE:To certainly install a seal ring in a groove by way of regulating an inclined attitude, projection or others of the seal ring and elastically recovering it in the regular position of the groove by providing a positioning disc capable of passing through the bore part of the seal ring on the head end of a shaft member of a specific length erected in the central part of an extruding member at the head end part of the extruding member. CONSTITUTION:When a seal ring R is pushed into a guide cylinder 2 by an extruding member 3, elastically deformed and shrunk in diameter and is ready to be released from its head end part, the seal ring R deformed and shrunk in diameter makes contact with a positioning disc 10 arranged immediately behind the groove part G of a pipe faucet part P1a and is elastically recovered at the correct and specific groove part G position. Consequently, the seal ring R is not projected ahead of a specific position, and it is possible to perfectly install the seal ring R by way of elastically recovering it perfectly at the correct position of this groove part G.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a sealing ring mounting device, and particularly to a device for mounting a sealing ring in a circumferential groove formed on the inner peripheral surface of a cylindrical body. be.

[Conventional technology]

When connecting conventional resin pipes, such as those used for sewage piping, if there is a possibility that external forces may be applied to the joints and cause them to bend, rigid connections such as adhesives are not preferred.
As an example is shown in FIG. 5, a groove G is provided on the inner periphery of a large-diameter socket Pla formed at the end of one pipe P1, and a sealing link R such as a rubber ring is mounted in the groove G. In many cases, a method is adopted in which the other pipe P2 to be connected is inserted into the inner diameter of the pipe and the other pipe P2 is connected.

Therefore, when installing the sealing link R in the groove G in advance, it is necessary to temporarily reduce the outer diameter of the sealing ring R, but this type of ring R is compressed evenly in the circumferential direction. If you try to make the diameter larger, it will buckle and deform irregularly, making it difficult to fit it into the groove G correctly. According to the inventor's patent application No. 1-277888, etc., a guide tube 2 is provided at the tip of the cylindrical casing 1 in which a plurality of protrusions 2C are arranged on the inner surface of the conical tube in the direction of the generatrix of the cone. By providing an extrusion member 3 which can be propelled in the axial direction and has a plurality of elastic comb teeth 4 in the circumferential direction, a plurality of equally divided circumferences of the sealing ring R are bent inward and the ring R is A device has been proposed that achieves the objective by reducing the diameter without changing the circumferential length.

For details, refer to the above cited document, and to avoid duplication, simply explain: insert the sealing ring R from the insertion port 5, and push the ring R in the axial direction (to the right in the figure) with each comb tooth 4 of the extrusion member 3. Then, a plurality of protrusions 20 disposed around the inner surface of the conical guide tube 2 press the sealing ring R from the outside and bend that part inward to reduce the diameter and form the groove G in the socket Dla.
The sealing ring is inserted into the groove G, and the circular shape R of the sealing ring is elastically restored to complete the installation within the groove G.

In addition, a guide groove 2d for guiding each comb tooth 4 is provided in the center of the top of each projection 2C so that each comb tooth 4 pushes the ring R in the axial direction in a straight line without bending. ing.

[Problem B that the invention attempts to solve]

However, in such a proposed example of a conventional mounting device, the sealing ring R whose diameter has been reduced by being pushed by each comb tooth 4 of the extrusion member 3 tends to separate from the tip of the guide tube 2. In some cases, the ring plane may become wavy or oblique, or the ring may elastically return to its original circular state after protruding from the groove G, making it impossible to completely insert the ring into the groove G. There was sex.

The present invention has been made in view of the problems of the conventional improvement proposals as described above, and the sealing song does not pop out before the predetermined position and completely elastically restores itself at the correct position in the groove. The aim is to provide a means for complete installation.

[Means to solve the problem]

Therefore, in the present invention, a positioning disk capable of penetrating the inner diameter of the sealing ring is provided at the distal end of a shaft member of a predetermined length that is axially erected in front of the center of the extrusion member of the sealing ring mounting device. The purpose of the present invention is to achieve the above object by configuring the device to include the following.

[Effect]

With the configuration of the present invention as described above, when the sealing ring is pushed into the guide cylinder by the extrusion member, elastically deforms and contracts in diameter, and attempts to separate from its tip, the deformed and contracted sealing ring is pushed into the groove of the vibrator socket. Since it comes into contact with the positioning disc disposed immediately after the groove part and elastically restores itself at the correct predetermined groove position, reliable mounting is achieved.

〔Example〕

The present invention will be explained below based on examples.

FIG. 1 is an axial center sectional view (corresponding to FIG. 4) of an embodiment of the device according to the present invention, FIG. b) shows a plan view of two examples of the positioning disk 10.

(Structure) In FIG. 1.2, the same (equivalent) components as in FIG. 4 of the prior art example described above are represented by the same reference numerals, and repeated explanations of individual components will be omitted.

A feature of the embodiment of the present invention is that the extrusion member 3 has a diameter slightly smaller than the inner diameter of the sealing ring R that is extruded through the inside of the guide cylinder 2 by a plurality of comb teeth 4 arranged around the circumference of the extrusion member 3; A positioning disc 10 is provided around the positioning disc 10 in which relief grooves 10a are carved at positions corresponding to the comb teeth 4 to avoid interference with the stiffness.
The groove G of the socket of the vibrator P is separated from the tip of the vibrator P.
The central part of the guide tube 2 is set so that the distance 1 between the tip of the guide 2 and the positioning disk 10@ section is slightly larger than the axial thickness of the sealing ring R, immediately before the fixed position when the guide tube 2 is inserted into the housing. This is because it is fixed to the front end of a shaft 11 that stands upright in front.

(Operation) For this reason, as shown in FIG. 2, when the sealing ring R is pushed out by the pushing member 3 and the ring R whose diameter has been reduced is about to separate from the tip of the guide tube 2, immediately before the predetermined position. The presence of the positioning disk 10 in the ring R prevents the ring R from becoming wavy or oblique, or from going too far and flying out, and it is elastically restored in the groove G at the correct position and is securely mounted.

Note that the number of comb teeth of the extrusion member 3, the number of protrusions 2C on the inner surface of the guide 2, the relief grooves 10a of the positioning disc 10, etc. shown in the above embodiments are not limited only to the side, but are generally used for sealing. It goes without saying that the appropriate number should be selected depending on the cross-sectional shape of the ring R, the size of the diameter, etc.

〔Effect of the invention〕

As explained above, according to the present invention, when the sealing ring is reduced in diameter by the guide tube, detached from the end thereof, and elastically restored and inserted into the groove of the pipe socket, the sealing ring is corrected. The position is determined by the positioning disk placed just before.
Since the diagonal posture and protrusion of the ring are regulated, it is now possible to elastically restore the ring to its normal position in the groove and to ensure that it is installed in the groove.

[Brief explanation of drawings]

FIG. 1 is an axial center sectional view of an apparatus according to an embodiment of the present invention;
Figure 2 is a sectional view of the same as above with the sealing ring completely installed;
3(a) and 3(b) are respective plan views of two examples of the positioning disk, FIG. 4 is a view corresponding to FIG. 1 of an example of the conventional device, and FIG.
The figure is an axial center sectional view of a main part of an example of a connection part of a sewage pipe. 1--Casing 2--Guide tube 2 c =--Protrusion 3--Extrusion member 4--Comb teeth 6--Socket portion 10-- -Positioning disc 11----Axle Pl, P2 = "... Pipe P I a "-"-" Socket R---- Sealing ring G ----- Groove

Claims (1)

[Claims] A cylindrical casing having at one end a guide tube having a plurality of protrusions extending along the conical generatrix on the inner surface of a conical tube with both ends open; In a sealing ring mounting device comprising a push-out member having a plurality of elastic axial comb teeth on a circumference with an imaginary diameter smaller than an inner diameter of a side end, an inner diameter portion of the seal ring is attached to a distal end of the push-out member. A sealing ring mounting device characterized in that a positioning disk capable of penetrating through the extruded member is disposed at the tip of a shaft member of a predetermined length that stands upright at the center of the extruded member.