Metal working – Means to assemble or disassemble – Coupling to conduit
Reexamination Certificate
2001-10-10
2003-04-22
Hail, III, Joseph J. (Department: 3723)
Metal working
Means to assemble or disassemble
Coupling to conduit
C029S251000
Reexamination Certificate
active
06550119
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a jig that is to be used in press insertion in which, in the case where pipe members made of resin for transporting a liquid having high purity or ultrapure water to be handled in a production process in production of semiconductor devices, production of medical equipment and medicines, food processing, chemical industry, or the like are connected to each other by means of a pipe joint, a sleeve-like inner ring is pressingly inserted into an inner periphery of one end portion of each of the pipe members in order to enhance the sealing property between the one end portion of the pipe member and the pipe joint, and prevent the pipe member from slipping off.
2. Description of the Prior Art
Conventionally, as an example of a pipe joint made of resin of this kind a configuration shown in
FIG. 14
is known (for example, Japanese Utility Model Publication No. 7-20471). The pipe joint made of resin shown in
FIG. 14
comprises a joint body
50
, a sleeve-like inner ring
23
, and a union nut (pressing ring)
51
which are made of resin having excellent chemical and heat resistances, such as fluororesin. In the joint body
50
, a receiving port
52
is formed in one end in the axial direction, and a primary sealing portion
53
is formed in an inner area of the receiving port
52
so as to intersect with the axis C of the joint body
50
. A secondary sealing portion
54
is formed in an entrance area of the receiving port
52
so as to intersect with the axis C, and an external thread portion
55
is formed on the outer periphery of the receiving port
52
. In the inner ring
23
, a fitting portion
56
having an outer diameter that allows the portion to be fitted into the receiving port
52
of the joint body
50
is formed in an inner end portion in the axial direction, and a bulge portion
57
having a mountain-like section shape is formed in an outer end side in the axial direction. The inner ring
23
is pressingly inserted into one end portion of a pipe member
14
made of resin under a state where the fitting portion
56
projects outwardly, whereby the diameter of the one end portion of the pipe member
14
is increased. An inner end sealing portion
58
which abuts against the primary sealing portion
53
of the joint body
50
is formed in an end portion of the fitting portion
56
, and an outer peripheral sealing face
59
which abuts against the secondary sealing portion
54
of the receiving port
52
is formed in a place corresponding to the bulge portion
57
. In the union nut
51
, an internal thread portion
60
which is to be screwed to the external thread portion
55
of the joint body
50
is formed.
The pipe member
14
is connected to the configured pipe joint made of resin in the following manner. Under a state where the one end portion of the pipe member
14
into which the inner ring
23
is pressingly inserted is inserted into the receiving port
52
of the joint body
50
, the internal thread portion
60
of the union nut
51
which is previously loosely fitted onto the outer periphery of the pipe member
14
is screw-fastened to the external thread portion
55
of the joint body
50
. This fastening causes the inner ring
23
to be pressed in the axial direction, so that the inner end sealing portion
58
and the outer peripheral sealing face
59
of the inner ring
23
abut against the primary and secondary sealing portions
53
and
54
of the receiving port
52
of the joint body
50
, respectively, thereby exerting a sealing function (sealing force).
A jig for pressingly inserting the inner ring
23
into one end portion of the pipe member
14
is disclosed in, for example, Japanese Utility Model Publication No. 57-33983 and Japanese Patent Application Laying-Open No. 11-156750.
In the inner ring press-insertion jig disclosed in Japanese Utility Model Publication No. 57-33983, as shown in
FIG. 15
, an outer ring
63
is set on a pipe member holding portion
62
disposed in the front end side of a jig table
61
, one end portion of the pipe member
14
is passed through the outer ring
63
and horizontally held, and a screw rod
65
is screwed with an external thread portion
64
disposed in the rear end side of the jig table
61
so as to be advanceable and retractable. A pressing piece
66
is formed integrally with the tip end of the screw rod
65
. The pressing member
66
is fitted into a hole of an inner ring
67
. When the screw rod
65
is rotated by a handle
68
to be advanced in the direction of the arrow A, the inner ring
67
is pressingly inserted and fixed into the inner periphery of one end portion of the pipe member
14
, and the outer ring
63
is pressingly inserted and fixed onto the outer periphery of the member.
FIG. 16
is a side view of the inner ring press-insertion jig disclosed in Japanese Patent Application Laying-Open No. 11-156750, and
FIG. 17
is a section view showing a state where press insertion of an inner ring is ended. Referring to
FIGS. 16 and 17
, an outer ring
72
is set on a pipe member holding portion
71
disposed in the front end side of a jig body
70
, one end portion of the pipe member
14
made of resin is passed through the outer ring
72
and horizontally held, and a screw rod
77
is screwed with an internal thread portion
73
disposed in the rear end side of the jig body
70
so as to be advanceable and retractable. A ball joint
78
is disposed in a tip end portion of the screw rod
77
. A pin holding member
79
is attached to the ball joint
78
. The pin holding member
79
holds a pressing pin
80
. The pressing pin
80
is inserted into an inner ring
81
. When the screw rod
77
is rotated by a handle
82
to be advanced in the direction of the arrow A, the inner ring
81
is pressingly inserted and fixed into the inner periphery of one end portion of the pipe member
14
made of resin, and the outer ring
72
is pressingly inserted and fixed onto the outer periphery of the member.
In the inner ring press-insertion jig shown in
FIG. 15
, when the pressing piece
66
at the tip end of the screw rod
65
is firmly fitted into the hole of the inner ring
67
, the inner ring
67
corotates with the screw rod
65
during the press insertion of the inner ring
67
. Consequently, there arises a disadvantageous situation in which torsional deformation is applied to the pipe member
14
. By contrast, in the inner ring press-insertion jig shown in
FIG. 16
, the pin holding member
79
and the pressing pin
80
can be relatively rotated, and hence torsional deformation is not applied to the pipe member
14
during the press insertion of the inner ring
81
.
As the inner rings
67
and
81
, rings of various sizes having different diameters are required so as to comply with the bore diameter of the counter pipe member
14
.
In the inner ring press-insertion jig shown in
FIG. 15
, the pressing piece
66
which holds the inner ring
67
is formed integrally with the tip end of the screw rod
65
, and hence cannot be detached from the screw rod. In the inner ring press-insert ion jig shown in
FIGS. 16 and 17
, similarly, the pressing pin
80
which holds the inner ring
81
cannot be detached from the tip end portion of the screw rod
77
. In both the inner ring press-insertion jigs, for each of different bore diameters of the counter pipe member
14
, therefore, it is necessary to prepare inner ring pressinsertion jigs of several kinds comprising the inner ring
67
or
81
of a size corresponding to the bore diameter of the pipe member.
SUMMARY OF THE INVENTION
The present invention is aimed at solving the noted problems. It is an object of the present invention to provide an inner ring press-insertion jig which can pressingly insert an inner ring into one end portion of a pipe member made of resin without applying torsional deformation to the pipe member, and which can singly cope with inner rings of several sizes. It is another object of the invention to provide an inner ring press-insertion jig in which operatio
Hirakawa Nobuhito
Ishida Takuya
Hail III Joseph J.
Nippon Pillar Packing Co. Ltd.
Shanley Daniel
LandOfFree
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