Inner ring press-insertion jig for a pipe joint made of resin

Details Inner ring press-insertion jig for a pipe joint made of resin Inner ring press-insertion jig for a pipe joint made of resin

2000-04-10

2001-12-04

Hail, III, Joseph J. (Department: 3723)

Metal working

Means to assemble or disassemble

To apply or remove a resilient article

C029S237000, C285S247000

Reexamination Certificate

active

06324739

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an inner ring press-inserting jig for a pipe joint made of resin, and particularly to an inner ring press-insertion jig for a pipe joint made of resin which is used in the connection of piping for a liquid having high purity of ultrapure water to be handled in a production process of various technical fields such as the production of semiconductor devices, the production of medical equipment and medicines, food processing, and chemical industry. The jig is used for pressingly inserting and fixing into one end portion of a resin pipe member serving as one connecting member of the pipe joint made of resin, a sleeve-like inner ring for enhancing the sealing and locking forces to be exerted between the pipe member and the joint body.
2. Description of the Prior Art
Conventionally, as pipe joints made of resin of this kind, those having a configuration shown in
FIG. 14
are known. The pipe joint made of resin shown in
FIG. 14
comprises a cylindrical joint body
1
produced from resin having excellent. chemical resistance and heat resistance, such as PFA, PTFE, and ETFE, a sleeve-like inner ring
8
, and a cap nut-like pressing ring
9
.
In the joint body
1
, a cylindrical pipe receiving port
2
is formed in one end in the axial direction, and an inclined sealing face
4
which elongates in a direction intersecting the axis C and forms a tertiary sealing portion
5
C that will be described later is formed in the inlet of the pipe receiving port
2
. An annular sealing end face
6
which forms a primary sealing portion
5
A that will be described later is formed in an inner portion of the pipe receiving port
2
. A cylindrical groove
7
which forms a secondary sealing portion
5
B that will be described later is formed in a position which is located at a radius which is greater than the annular sealing end face
6
in a radial direction. An external thread portion
3
is formed on the outer periphery of the pipe receiving port
2
.
The sleeve-like inner ring
8
is formed so as to have an inner diameter which is equal to the inner diameters of a resin pipe member
10
and a cylinder portion IA of the joint body
1
, so as not to impede movement (flow) of a fluid. The inner ring has a fitting portion
11
which can be fitted into the pipe receiving poll:
2
of the joint body
1
. A bulge portion
13
which has a mountain-like section shape is formed on the outer side on the tip end side of a pipe member press insertion portion
12
which is formed continuously with the fitting portion
11
. An insertion portion
15
of the pipe member
10
is formed which is to be inserted into the pipe receiving port
2
of the joint body
1
, and which has an outer peripheral sealing face
14
. When the press insertion portion
12
of the inner ring
8
is pressingly inserted into one end portion of the pipe member
10
under a state where the fitting portion
11
projects from the end portion of the pipe member
10
, the diameter of the peripheral wall of the pipe member
10
in a place corresponding to the bulge portion
13
is increased to cause the outer peripheral sealing face
14
to abut against the inclined sealing face
4
in the axial direction which is formed in the inlet of the pipe receiving port
2
of the joint body
1
, thereby forming the tertiary sealing portion
5
C.
In the fitting portion
11
of the inner ring
8
which projects from the pipe member
10
, a protruding inner end face
16
is formed. When the insertion portion
15
of the pipe member
10
is inserted into the pipe receiving port
2
of the joint body
1
, the protruding inner end face
16
abuts against the annular sealing end face
6
in the axial direction to form the primary sealing portion
5
A. Each of the protruding inner end face
16
and the annular sealing end face
6
is formed into a tapered face in which the diameter is gradually reduced toward the inner periphery side. A cylindrical sealing portion
17
which projects in the axial direction outwardly more than the protruding inner end face
16
configured by the tapered. face is integrally projected from a position of the protruding inner end face
16
on the outer side in a radial direction. The cylindrical sealing portion
17
is to be pressingly inserted into the cylindrical groove
7
to form the secondary sealing portion
5
B.
In the cap nut-like pressing ring
9
, an internal thread portion
18
which is to be screwed to the external thread portion
3
of the joint body
1
is formed in the inner peripheral face of a cylindrical portion
9
A, and an annular pressing portion
9
B is continuously integrated with an outer end portion of the cylindrical portion
9
A. The annular pressing portion
9
B elongates toward the axial center and externally presses the pipe member
10
. A pressing edge
9
C is formed in an inner edge position of the annular pressing portion
9
B.
In the pipe joint made of resin having the thus configured components
1
,
8
, and
9
, the press insertion portion
12
of the inner ring
8
is pressingly inserted and fixed into the one end portion of the pipe member
10
to increase the diameter of the peripheral wall of the pipe member
10
in a place corresponding to the bulge portion
13
formed in the press insertion portion
12
, whereby both the components
8
and
10
are integrally coupled together to form the insertion portion
15
of the pipe member
10
. Under this state, the insertion portion
15
of the pipe member
10
is inserted into the pipe receiving port
2
of the joint body
1
to advance the cylindrical sealing portion
17
of the inner ring
8
into the cylindrical groove
7
of the joint body
1
.
Thereafter, the internal thread portion
18
of the pressing ring
9
which is loosely fitted onto and held on the outer side of the pipe member
10
is screwed to the external thread portion
3
of the joint body
1
to cause the pressing ring
9
to screwingly advance toward the joint body
1
. Therefore, the inner ring
8
is pressed in the axial direction by the pressing edge
9
C of the annular pressing portion
9
B, so that the cylindrical sealing portion
17
of the inner ring
8
is pressingly inserted into the cylindrical groove
7
of the joint body
1
. As a result, a contact pressure is generated between the inner and outer peripheral faces of the two components
17
and
7
, thereby forming the secondary sealing portion
5
B which elongates in the axial direction. The pressing ring
9
is further screwingly advanced to be strongly tightened. As a result, the axial length of the secondary sealing portion
5
B is increased, and the protruding inner end face
16
of the inner ring
8
abuts against the annular sealing end face
6
of the pipe receiving port
2
of the joint body
1
to generate a contact pressure in the axial direction between the components
16
and
6
, thereby forming the primary sealing portion
5
A. Furthermore, the outer peripheral sealing face
14
which is formed on the insertion portion
15
of the pipe member
10
abuts in the axial direction against the inclined sealing face
4
which is formed in the inlet of the pipe receiving port
2
of the joint body
1
, thereby forming the tertiary sealing portion
5
C. As a result, the pipe member
10
is connected to the joint body
1
under a slipping off preventing state and a sealed state.
As a jig for pressingly inserting and fixing the sleeve-like inner ring
8
into the one end portion of the pipe member made of resin
10
in the thus configured pipe joint made of resin, known is an inner ring inserting apparatus which is disclosed in, for example, Japanese Utility Model Publication Laying-Open No. 62-134629. In the inner ring inserting apparatus of the prior art, as shown in
FIG. 15
, a clamp portion
21
which fixedly holds the pipe member
10
is disposed in one end side of a base arm
20
. A grip portion
22
, and a toggle lever
23
which is swingably pivotally attached to the grip portion
22
are disposed in the other end si

Affiliated with

Also associated with

Rating

Inner ring press-insertion jig for a pipe joint made of resin does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Inner ring press-insertion jig for a pipe joint made of resin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Inner ring press-insertion jig for a pipe joint made of resin will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2559605