JPH11210952A - Mounting structure of packing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To firmly and easily mount an annular packing on the end face of a tubular member to be fitted. SOLUTION: An annular fitting groove 71 is formed in the tip surface of a slide cylinder 7 being a member to be fitted. A partition wall part 93 erecting toward the release side of the fitting groove 71 is formed in an annular state on the bottom of the fitting groove 71 along the fitting groove 71. A locking protrusion part 93a is formed on the inner peripheral surface of a partition wall part 93. A fitting-in recessed part 52 in which the partition wall part 93 is pressed is formed in the rear end face of the packing 5 formed of an elastic material, such as rubber. A lock recessed part 53 in which a lock protrusion part 93a is fitted is formed on the side on the inner peripheral side of the fit-in recessed part 52.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for mounting an elastic annular packing to a tubular mounting member.

[0002]

2. Description of the Related Art In general, when two pipes are connected to each other in an airtight manner, for example, when a socket is connected to a plug of a gas appliance, an annular packing made of an elastic material such as rubber is attached to the socket. Then, the socket is brought into contact with the tip surface of the plug via the packing. Thus, the socket and the plug are air-tightly connected (see Japanese Patent Application Laid-Open No. 7-127784).

Conventionally, when an annular packing is attached to the distal end of a cylindrical body, the attachment structure shown in FIG. 9 or FIG. 10 is usually employed. Mounting structure shown in FIG. 9 is a structure described in the above publication, the stepped portion T ₁ of the annular formed on the inner circumferential side of the distal end surface of the tubular body T, together with fitting the packing Pa in the stepped portion T ₁ it is intended to adhere the contact surface with the stepped portion T ₁ and the packing Pa. The mounting structure shown in FIG.
The distal end surface of the cylindrical body T forming an annular mounting groove T _2, fitting the packing Pa to the mounting groove T _2. Then, as shown in phantom in the drawing, by bending toward the inner peripheral side wall portion T ₃ of the tubular body T to the outer peripheral side, it is intended to attach the packing Pa in a tubular body T.

[0004]

The packing Pa is pressed and deformed each time the cylinder T is connected to or disconnected from another cylinder T '. Therefore, in the mounting structure shown in FIG. 9, the adhesion strength between the packing Pa and the stepped portion T ₁ is gradually decreased, packing Pa is likely to fall off from the cylindrical body T. On the other hand, in the mounting structure shown in FIG.
Possibility of packing Pa comes off from the cylindrical body T is little, but the side wall portion T ₃ for attaching the packing Pa in a tubular body T must bend over the entire circumference, requires much labor for the work. As a result, there is a problem that the manufacturing cost increases.

[0005]

In order to solve the above-mentioned problem, the invention according to claim 1 is an attachment structure for attaching an annular packing made of an elastic material to one end of a tubular member to be attached. A mounting groove in which the packing is fitted is formed in one end surface in the axial direction of the mounted member in an annular shape along the circumferential direction of the mounted member, and the mounting groove is opened at a bottom surface of the mounting groove. A partitioning part that rises toward the side is formed, and a locking projection that protrudes in the radial direction of the mounted member is formed in the partitioning part, and a fitting recess in which the partitioning part fits in the packing is formed. In addition, a locking recess into which the locking protrusion fits is formed on a side surface of the fitting recess.

In this case, it is desirable that the partition wall and the locking projection are formed in an annular shape along the mounting groove, and the fitting recess and the locking recess are formed in an annular shape. Further, the mounted member is composed of a main portion and a sub-portion which is separate from the main portion and fixed to the main portion, and the mounting groove is formed by the main portion and the sub-portion. Like
One of the main portion and the sub-portion has one side surface of the mounting groove, a bottom surface following the one side surface and the partition wall portion, and the other side surface of the mounting groove and the other side surface on the other side. Is desirably formed. further,
The tip of the side wall portion of the mounted member having the side surface of the mounting groove facing the locking projection is pivoted in the radial direction of the mounted member around a base end portion on the bottom side of the mounting groove. It is desirable that the mounting groove be formed so as to be elastically deformable so that the opening width of the mounting groove can be enlarged or reduced by displacement.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In this embodiment, as shown in FIGS. 2 and 3, a mounting structure of the present invention is mounted on a socket S for connecting a gas pipe G made of a rubber pipe or the like to a plug P of a gas plug, a gas appliance or the like. Is applied. Of course, the present invention can be applied to a device other than the socket S.

First, the socket S will be described with reference to FIGS. 2 and 3. The socket S has a main body 1. The main body 1 has a cylindrical shape, and the inside thereof forms a gas passage 11. Rear end of main body 1 (hereinafter, for socket S, plug P side is referred to as front and the opposite side is referred to as rear)
A connecting portion 12 for fitting and connecting the gas pipe G is formed on the outer peripheral surface, and a cylindrical outer cylindrical portion 13 is formed on the central outer peripheral surface.
The rear end portion is formed integrally with the main body 1 so as to be aligned with the axis. The distal end of the outer cylindrical portion 13 extends forward from the main body 1, and a plurality of through holes 14 are formed in the outer cylindrical portion 13 at equal intervals in the circumferential direction. The steel ball 2 is accommodated in each through hole 14 so as to be movable in the radial direction of the outer cylindrical portion 13. The outer diameter of the steel ball 2 is larger than the thickness of the outer cylindrical portion 13. Therefore, a part of the steel ball 2 protrudes from the through hole 14 to the outer peripheral side or the inner peripheral side.

A cylindrical cover 3 is arranged outside the outer cylindrical portion 13. The rear end of the cover 3 is
Are fitted and fixed to the center portion of the outer cylinder portion and the rear end portion of the outer cylindrical portion 13. The rear end of the operation tube 4 is slidably inserted between the inner peripheral surface of the distal end portion of the cover 3 and the outer peripheral surface of the distal end portion of the outer cylindrical portion 13. On the inner peripheral surface of the operation cylinder 4, a large-diameter hole portion 41 is formed on the front end side, a small-diameter hole portion 42 is formed on the rear end side, and an inclined surface 43 is formed therebetween. The operation cylinder 4
Is urged forward by the spring S _1, in a state not connected to the socket S with the plug P as shown in FIG. 2, the large-diameter hole portion 41 is opposed to the steel balls 2, steel balls 2 through It is allowed to protrude from the hole 14 to the outer peripheral side. Moreover,
By the inclined surface 43 comes into contact with steel balls 2 protruding from the through hole 14, the operating tube 4 is stopped against the biasing force of the spring S _1. On the other hand, as shown in FIG. 3, in a state where the socket S is connected to the plug P, the inclined surface 43 stops by hitting the annular step portion 15 formed on the outer peripheral surface of the distal end portion of the outer cylindrical portion 13. I have. In this state, the inner peripheral surface of the small-diameter hole portion 42 comes into contact with the steel ball 2 to prevent the steel ball 2 from protruding from the through hole 14 to the outer peripheral side.

A slide cylinder (attached member) 7 is slidably disposed between the outer peripheral surface of the front end portion of the main body 1 and the inner peripheral surface of the rear end portion of the outer cylindrical portion 13. Slide cylinder 7 is urged forward by the spring S _2, in a state not connected to the socket S with the plug P as shown in FIG. 2, the engagement of annular formed at the rear end outer peripheral surface The portion 81a is the outer cylindrical portion 13
Is stopped by abutting against an annular protruding portion 16 formed on the inner peripheral surface of the. In this state, the outer peripheral surface of the distal end portion of the slide cylinder 7 abuts against the steel ball 2 to prevent the steel ball 2 from protruding from the through hole 14 to the inner peripheral side. An annular packing 5 is attached to the distal end of the slide cylinder 7. As shown in FIG. 3, when the socket S is attached to the plug P, the slide cylinder 7 is pushed rearward by the plug P via the packing 5. , Is located behind the steel ball 2. Therefore, in that state, the steel ball 2
Is allowed to protrude from the through hole 14 to the inner peripheral side.
Details of the structure of the slide cylinder 7 and the mounting structure of the packing 5 will be described later.

The plug P is a Japanese Industrial Standard (JI)
As specified in S), and a tubular shape, in its front end face, with the projecting portion P ₁ forming a part of the spherical surface is formed, an annular flat surface P ₂ perpendicular to the axis is formed, an annular groove P ₃ to form a V-shaped cross section which fits the steel ball 2 is formed on its outer peripheral surface.

When the socket S having the above-described configuration is connected to the plug P, the socket S is moved forward, and the plug P is inserted into the outer cylindrical portion 13. When the front end face of the plug P abuts via a packing P to the tip portion of the slide tube 7 is moved rearwardly against the biasing force of the slide tube 7 spring S _2. When the slide tube 7 is moved from the steel balls 2 to the rear, groove P ₃ of the plug P is opposed to the steel balls 2,
Steel balls 2 is pressed to the inner circumferential side by the inclined surface 43 of the operating tube 4 and enters into the groove P _3. At the same time, is moved forward by the operation tube 4 spring S _1, the small-diameter portion 42
Faces the steel ball 2. As a result, steel ball 2 side is kept having entered the groove P _3, the socket S is connected to the plug P.

When the socket S is to be removed from the plug P, the operating cylinder 4 is moved backward against the urging force of the spring S ₁ so that the large-diameter hole 41 faces the steel ball 2. Then
The steel ball 2 can move to the outer peripheral side. As a result, the main body 1 is moved backward by the springs S ₁ and S ₂ , and the steel ball 2 is pushed by the side surface of the groove P _{3 and} comes out therefrom. Therefore, the socket S can be removed from the plug P by moving the operation cylinder 4 further backward. Further, when the main body 1 is moved rearward, is moved relatively to the front by the slide tube 7 spring S ₂ accordingly. Then, the entire socket S returns to the original state shown in FIG.

Next, the structure of the slide cylinder 7 and the mounting structure of the packing 5 will be described. As shown in FIG. 1, a slide cylinder 7 includes a main cylinder portion (main portion) 8 which is separate from each other,
And a sub-cylinder 9 (sub-portion). Each of the main cylinder part 8 and the sub cylinder part 9 is formed by molding a resin, and is formed in a cylindrical shape.

As shown in FIGS. 1 and 4 to 6, the main cylinder portion 8 has a base portion 81 on the rear end side, a small-diameter portion provided integrally with a front end portion of the base portion 81, and a front end of the small-diameter portion 82. An annular flat plate portion 83 provided integrally with the portion and protruding inward in the radial direction, and a holding tubular portion 84 integrally formed at an inner peripheral end portion of the annular flat plate portion 83 are provided. They are formed with their axes aligned. The holding cylinder 84 is
Its thickness is thin, and it can be elastically deformed so that the distal end expands and contracts. The portions other than the holding tube portion 84 have such strength that they are hardly elastically deformed.

The engaging portion 81a is formed at the rear end of the outer peripheral surface of the base 81, and the annular projecting portion 81b is formed at the front end. An annular concave portion 81c is formed on the outer peripheral surface following the rear end side of the annular projecting portion 81b.
A plurality (four in this embodiment) of grooves 81d extending in the circumferential direction are formed in contact with the annular concave portion 81c. The grooves 81d are arranged at equal intervals in the circumferential direction of the base 81. The depth of the groove 81d is deeper than the annular concave portion 81c.

On the distal end surface of the base 81, there are formed as many slots 81d as the number of grooves 81d extending in the circumferential direction. Each long hole 81
e is arranged so as to be in contact with the small-diameter portion 82, and reaches the groove 81d through the inside of the base portion 81 slightly on the inner peripheral side of the annular projecting portion 81b and the annular concave portion 81. Long hole 81e
And a substantial portion existing between the bottom of the annular concave portion 81c and
Notches 81f, 81f extending from the groove 81d to the annular protrusion 81b are formed at locations corresponding to both ends of the elongated hole 81e in the circumferential direction of the base 81, respectively. As a result, the substantial portion is connected only to the annular projecting portion 81b, is separated from the other portion of the base 81, and a locking piece 81g extending from the annular projecting portion 81b to the rear side of the base 81 is formed. The locking piece 81g has a small thickness, and its front end (the end on the rear side of the base 81) is centered on the base end.
It is elastically deformable so that it can rotate in the radial direction. The surface facing the long hole 81e of the locking piece 81g is an inclined surface 81h that is radially inward toward the rear.

As shown in FIGS. 1, 4, 5 and 7, the sub-cylinder portion 9 is formed integrally with the base portion 91 on the front end side and the rear end portion of the base portion 91, and protrudes inwardly. An annular flat plate portion 92, an inner cylindrical portion 93 extending forward from an inner peripheral end of the annular flat plate portion 92, and a fitting cylindrical portion 94 extending rearward from the center of the rear end face of the annular flat plate portion 92. , They are formed with their axes aligned.

The fitting cylindrical portion 93 can be fitted on the outer peripheral surface of the small diameter portion 82 of the main cylindrical portion 9, and the rear end surface thereof has the same number of engaging arms 95 extending rearward as the number of the long holes 81e. . The engaging arms 95 are arranged at equal intervals in the circumferential direction, and can be inserted into the elongated holes 81e. Moreover, when the fitting cylindrical portion 94 is fitted into the small-diameter portion 82 until the annular flat portion 92 abuts against the annular flat portion 83, the distal end of the engaging arm 95 passes through the long hole 81e and projects into the groove 81d. A locking projection 95a that engages with the rear end face of the locking piece 81g is formed therein. Then, the fitting cylindrical portion 94
Is fitted into the small diameter portion 82, the engagement arm 95 is inserted into the long hole 81e, and the locking projection 95a is engaged with the locking piece 81g, so that the sub-cylinder portion 9 is fixed to the main cylinder portion 8. Installed with.

As shown in FIG. 5, when the sub-cylinder 9 is attached to the main cylinder 8, an annular mounting groove 71 whose front is open is formed on the distal end surface of the slide cylinder 7. In this case, the outer side surface of the mounting groove 71 is the base 91 of the sub-cylinder 9.
The inner side surface of the main cylindrical portion 8
4 and the bottom surface is formed by the annular flat plate portions 83 and 92. As a result, the inner cylindrical portion 93 of the sub-cylindrical portion 9
Is a partition that extends annularly inside the mounting groove 71 and bisects the inside and outside. A locking projection 93a protruding toward the holding cylinder 84 is formed in an annular shape along the inner cylinder 93 at the tip of the inner cylinder 93 serving as a partition wall. As shown in FIGS. 2 and 3, a sealing member 10 is provided between the outer peripheral surface of the fitting cylindrical portion 94 of the sub-cylindrical portion 9 and the inner peripheral surface of the outer cylindrical portion 13.

The reason why the slide cylinder 7 is divided into the main cylinder part 8 and the sub cylinder part 9 is in consideration of ease of molding. That is, since the locking projection 93 a projecting in the width direction of the mounting groove 71 is formed in the inner cylinder 93, the slide cylinder 7 is temporarily provided.
If the whole is integrally molded, when the molded slide cylinder 7 is released from the die, the die interferes with the locking projection 93a, and the release becomes difficult. In this regard, slide cylinder 7
Is divided into the main cylinder portion 8 and the sub cylinder portion 9, such a problem of interference can be easily avoided, and the main cylinder portion 8 and the sub cylinder portion 9 can be easily formed. This is because the slide cylinder 7 can be easily formed.

The packing 5 mounted on the mounting groove 71 is made of rubber or another elastic material.
As shown in (B) and FIGS. 8 (A) and (B), it is formed in a short cylindrical shape. The thickness of the packing 5 in the radial direction is substantially the same as the width of the mounting groove 71, but the outer peripheral surface thereof is formed with ridges 51, 51 extending annularly along the circumferential direction. Therefore, the packing 5 is fitted in the mounting groove 71 while being compressed in the radial direction by the height of the ridge 51.

A fitting recess 52 into which the inner cylindrical portion 93 serving as a partition wall is fitted is formed in the rear end face of the packing 5 in an annular shape along the circumferential direction. The width of the fitting recess 52 is slightly smaller than the thickness of the inner cylindrical portion 93. Therefore, the inner cylindrical portion 93 is inserted into the fitting concave portion 52 in a press-fit state. A locking recess 53 into which the locking protrusion 93a fits is formed in an annular shape on the inner side surface of the fitting recess 52. Then, the locking projection 53a is formed in the locking recess 53.
The packing 5 is prevented from falling out of the mounting groove 71 by fitting. In this case, the locking projection 93a
Of the engaging concave portion 53 and the surface of the engaging concave portion 53 facing forward are engaged with each other, and furthermore, they are planes perpendicular to the front-rear direction.
By this, the packing 5 is almost certainly prevented from coming off the mounting groove 71.

On the outer peripheral side of the end face of the packing 5,
An annular contact portion 54 protruding forward and radially outward is formed. The contact portion 54 is provided at the base 91 of the sub-cylinder 9.
The end face of the Then, the socket S when connected to the plug P, together with the distal end surface of the abutment portion 54 abuts against the flat surface P ₂ of the plug P, the intersection of the distal end surface and the inner peripheral surface of the packing 5 on the projecting portion P ₁ The contact between the plug P and the socket S is hermetically sealed.

When the packing 5 is mounted in the mounting groove 71, the following two methods can be adopted. When the first mounting method is adopted, the main cylinder 8 must be
Is attached to form a slide cylinder 7, and an annular mounting groove 71 is formed at the tip thereof. Then, the packing 5 is fitted into the mounting groove 71 from its rear end. In this case, at the beginning of the fitting, the rear end portion of the packing 5 on the inner peripheral side from the fitting concave portion 52 gets over the locking projection 93a. The holding cylinder 84 is deformed so that the distal end of the cylinder 84 is reduced in diameter, that is, the groove width of the mounting groove 71 is increased. Therefore, the rear end of the packing 5 can easily go over the locking projection 93a, and the packing 5 can be easily fitted into the mounting groove 71. When the rear end of the packing 5 rides over the locking projection 93a, the rear end and the holding cylinder 8
4 is elastically returned to the original state, and the locking projection 93a is fitted into the locking recess 53. Thereby, the packing 5 is attached to the attachment groove 71.

When the second mounting method is adopted, first, the inner cylindrical portion 93 of the sub-cylindrical portion 9 is fitted into the fitting concave portion 52 of the packing 5. In this case, at the beginning of the fitting, the rear end portion of the packing 5 on the inner peripheral side with respect to the fitting concave portion 52 is engaged with the locking projection 93a.
However, since the inner and outer peripheral portions of the rear end portion of the packing 5 are elastically deformed so as to reduce and increase the diameter, respectively, the locking protrusion 93a can be easily overcome. Next, the sub-cylinder 9 to which the packing 5 is attached is attached to the main cylinder 8. As a result, the slide cylinder 7 and the mounting groove 71 are formed by the main cylindrical part 8 and the sub-cylindrical part 9, and the packing 5 is mounted in the mounting groove 71.

Regardless of which mounting method is adopted, the locking projection 93a and the locking recess 53 are engaged with the packing 5 mounted in the mounting groove 71. Moreover,
The engaged state is maintained by the holding cylinder 84 of the main cylinder 8. Therefore, it is possible to reliably prevent the packing 5 from falling out of the mounting groove 71. Moreover, when attaching the gasket 5 in the mounting groove 71, since it is not necessary to bend the side wall portion T ₃ as in the prior art shown in FIG. 10, the labor required for the mounting it can be largely reduced.

The present invention is not limited to the above-described embodiment, but can be modified as appropriate. For example, in the above embodiment, the inner cylindrical portion 9 as a partition portion
Although 3 is formed in an annular shape, it may be divided into a plurality in the circumferential direction.

[0029]

As described above, according to the first aspect of the present invention, it is possible to prevent the packing from dropping from the member to be mounted, and to easily attach the packing to the member to be mounted. The effect that it can be attached is obtained. According to the second aspect of the present invention, an effect is obtained that the falling off of the packing can be more reliably prevented. According to the third aspect of the invention, an effect is obtained that the mounted member can be easily formed. According to the invention according to claim 4, an effect is obtained that the packing can be more easily attached to the attached member.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the present invention, FIG. 1 (A) is a front view showing a state in which packing is attached to a slide cylinder as a member to be mounted, and FIG. 1 (B) is FIG. A) B
It is -B sectional drawing.

FIG. 2 is a sectional view showing a socket in which the slide cylinder and the packing shown in FIG. 1 are used.

FIG. 3 is a sectional view showing a state where the socket shown in FIG. 2 is connected to a plug.

FIG. 4 is an exploded sectional view showing a main cylinder part and a sub cylinder part of the slide cylinder of the embodiment shown in FIG. 1;

FIG. 5 is a cross-sectional view showing a state in which a main cylinder part and a sub cylinder part of the slide cylinder of the embodiment shown in FIG. 1 are assembled.

6 is a diagram showing a main cylinder portion of the slide cylinder of the embodiment shown in FIG. 1, wherein FIG. 6 (A) is a front view thereof, and FIG. 6 (B).
FIG. 7 is a view as seen from the arrow B in FIG.

7 is a view showing a sub-cylinder portion of the slide cylinder of the embodiment shown in FIG. 1, wherein FIG. 7 (A) is a front view thereof, and FIG. 7 (B).
7A is a cross-sectional view taken along line BB of FIG. 7A, and FIG.
FIG.

8A and 8B are views showing the packing of the embodiment shown in FIG. 1, wherein FIG. 8A is a front view thereof, and FIG.
It is a BB sectional view of (A).

FIG. 9 is a cross-sectional view showing an example of a conventional mounting structure for packing to a mounted member.

FIG. 10 is a cross-sectional view showing another example of the conventional mounting structure of the packing to the mounted member.

[Explanation of symbols]

 Reference Signs List 5 packing 7 slide cylinder (member to be mounted) 8 main cylinder part (main part) 9 sub cylinder part (sub part) 52 fitting concave part 53 locking concave part 71 mounting groove 84 holding cylindrical part (side wall part having side surface of mounting groove) ) 93 Inner cylindrical part (partition part) 93a Locking projection

Claims (4)

[Claims] 1. A mounting structure for mounting an annular packing made of an elastic material to one end of a cylindrical mounting member, wherein the packing is fitted to one axial end surface of the mounting member. The mounting groove to be formed is formed in an annular shape along the circumferential direction of the mounting member, and a partition wall that rises toward the open side of the mounting groove is formed on the bottom surface of the mounting groove, and the mounting member is formed in the partition wall. Forming a locking projection that projects in the radial direction, forming a fitting recess in which the partition wall fits in the packing, and locking the locking projection in a side surface of the fitting recess. A packing mounting structure characterized by forming a concave portion. 2. The device according to claim 1, wherein said partition and said locking projection are formed in an annular shape along said mounting groove, and said fitting recess and said locking indent are formed in an annular shape. Mounting structure of the packing described. 3. The mounting member comprises a main portion, and a sub-portion separate from the main portion and fixed to the main portion, and the mounting groove is formed by the main portion and the sub-portion. One side of the mounting groove, the bottom surface following the one side and the partition wall are formed on one of the main part and the sub part so as to be formed, and the other side of the mounting groove is formed on the other side. 3. The packing mounting structure according to claim 1, wherein a bottom surface is formed following the other side surface. 4. A side wall of the mounted member having a side surface of the mounting groove opposed to the locking projection, and a front end of the side wall of the mounted member is centered on a base end on a bottom side of the mounting groove. The packing mounting structure according to any one of claims 1 to 3, wherein the packing structure is formed so as to be elastically deformable so that the opening width of the mounting groove can be enlarged or reduced by being rotationally displaced in a radial direction.