JPH0441132A - Seal ring installation device - Google Patents

Abstract

PURPOSE:To certainly install a seal ring at each sinker post of a extruding member by way of shrinking the seal ring in diameter in a specific shape and elastically recovering it correctly in a groove part of a pipe faucet part by forming each guide groove for sandwiching each projection in a guide cylinder from both sides and for guiding it rectilinearly on the head end part of each sinker post. CONSTITUTION:In a process to extrude and diametrically shrink a seal ring in a guide cylinder 2 by each sinker post 4 of a extruding member 3, each of the sinker post 4 sandwiches each projection 2C on the inner surface of the guide cylinder 2 from outside by each guide groove 4a and is driven in the shaft direction. Accordingly, even in the case when breadth and height of each projection 2C are comparatively small, engagement is not released and the seal ring is rectilinearly guided in the shaft direction, released at the edge part of the guide cylinder 2, elasticity recovered in the groove of a pipe faucet part correctly and a specific installation is certainly carried out.

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.

(Prior art) When connecting conventional resin vibrators for sewage piping, etc., rigid connection using adhesives or the like is not preferable in cases where there is a possibility that external force may be applied to the joint and cause it to bend. ,
As an example is shown in Fig. 4, a groove G is formed on the inner periphery of a large-diameter socket P1° formed at the end of one of the vibrators P1, and a sealing link R such as a rubber ring is installed in the groove G. In many cases, a method is adopted in which the other vibrator P2 to be connected is inserted into the inner diameter of the vibrator and then connected.

For this reason, when sealing ring R is installed in groove G in advance, is it necessary to temporarily reduce the outer diameter of sealing ring R? 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 Japanese Patent Application No. 1-277888 filed by the inventor, a guide tube 2 is provided at the tip of a cylindrical casing 1, and a guide tube 2 is provided in which a plurality of protrusions 2C are arranged on the inner surface of a 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 and disclosed in which the diameter is reduced without changing the circumferential length to achieve the purpose.

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.

Note that 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 to be solved by the invention]

However, in the proposed configuration example of the conventional mounting device as described above, each protrusion arranged on the inner periphery of the conical guide tube 2 passes through the diameter-reduced sealing ring R inside the conical small end. Since the inner cross-sectional area of the small end must be larger than the planar cross-sectional area of the reduced diameter sealing ring that passes through it, due to this constraint, each protrusion In some cases, it is difficult to sufficiently increase the cross section of the guide groove 2d, and hence the width and depth of the guide groove 2d, and there is a problem in that each comb tooth 4 tends to come off the guide groove 2d during the extrusion process.

The present invention has been made in view of the problems of the conventional improvement proposals as described above.
Even when the height and width of C are relatively small, each comb tooth 4 can move linearly and contract into a predetermined shape with the sealing ring R without coming off from these protrusions during the extrusion process. The purpose is to provide the means to do so.

[Means to solve the problem]

Therefore, in the present invention, in the step of reducing the diameter of the sealing link by the extrusion device in the conical guide tube of the sealing ring mounting device, each comb tooth of the extrusion member pushes each protrusion in the guide tube on both sides. The above object is achieved by forming guide grooves at the tip of each comb tooth for linearly guiding the comb teeth.

[Effect]

According to the configuration of the present invention as described above, in the step of elastically deforming and reducing the diameter of the sealing link by being pushed into the guide tube by the extrusion member, the cross-sectional area of each protrusion in the guide tube is small, and the guide grooves are formed in these protrusions. Even if it is not provided, the guide groove or each protrusion of each comb tooth can be pinched from the side and guided to move correctly in a straight line, so the diameter of the sealing ring can be reliably reduced, and the vibrator receptacle can be reliably tightened. It can be installed inside the groove.

〔Example〕

The present invention will be explained below based on examples.

FIGS. 1(a) and 1(b) are a side view of a push-out member 3 according to an embodiment of the present invention, a cross-sectional view showing the engagement state of the push-out member 3 with each comb tooth in the guide tube 2, and FIG. Figure 2 (a
) to (C) are sectional views showing three examples of guide grooves 4a at the tips of the comb teeth 4, respectively.

(Structure) As shown in FIG. 1.2, the feature of this embodiment of the invention is that, as shown in FIG. This is because guide grooves 4a are provided to hold the projection 2c from both sides.

(Operation) For this reason, as shown in FIG. 3 of the conventional example, in the process of pushing out the sealing ring R within the guide cylinder 2 with each comb tooth 4 of the extrusion member 3 to reduce its diameter, each comb tooth 4 Each projection 2C on the inner surface of 2 is held between the outside by each guide groove 4a and propelled in the axial direction. It is guided linearly, detached at the end of the guide tube 2, and elastically restores itself correctly into the groove G of the pipe socket portion Pla, ensuring that the specified installation is performed reliably.

〔Effect of the invention〕

As explained above, according to the present invention, in the process of reducing the diameter of the sealing ring by the guide tube, when the cross-sectional area of each protrusion in the guide tube is relatively small and the guide groove cannot be provided in the protrusion, However, due to the guide grooves in each comb tooth of the extrusion member, the sealing ring moves straight in a straight line, reduces its diameter to a predetermined shape, is ejected from the guide tube, and is properly elastically restored within the groove of the pipe socket and securely installed. Ru.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are a side view and a cross-sectional view showing the state of engagement with each comb tooth in the guide station, respectively, and FIGS. C) is a cross-sectional view of three examples of the guide groove of each comb tooth, and FIG.
An axial center sectional view of an example of a conventional sealing ring mounting device,
FIG. 4 is an axial center sectional view of a main part of an example of a conventional sewage pipe connection part. 1--Casing 2-- Guide tube 2 c ''-- Protrusion 2 d --- Guide groove 3 --- Extrusion member 4 --- Comb teeth 4 a −−−−−Guide groove 6... Socket part p,, p2- Shaft/pipe P,, ++... Socket part R... Sealing ring G −−−− ---Mizo

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 an extruded 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 portion, each comb tooth of the extruded member is provided with a plurality of axial comb teeth in the guide cylinder. A sealing ring mounting device characterized in that each guide groove is formed at the tip of each comb tooth for pinching each protrusion from both sides and guiding it linearly.