Spacer-less type pipe joint and packing ring used for the same

Details Spacer-less type pipe joint and packing ring used for the same Spacer-less type pipe joint and packing ring used for the same

2002-07-30

2004-08-10

Nicholson, Eric K. (Department: 3679)

Pipe joints or couplings

Packed

Externally with clamp

C285S104000, C285S232000

Reexamination Certificate

active

06773040

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a spacer-less type pipe joint and a packing ring used for the same, and in particular, to a spacer-less pipe joint made of metal or resin and used for a water pipe or the like and a packing ring used for the same.
2. Description of the Related Art
FIG. 10
shows a structural example of this type of conventional pipe joint made of metal or resin and used for a water pipe or the like. The pipe joint is used to joint end portions of jointed pipes
61
,
61
, which are made of metal or resin and oppose to each other on an axis in such a way that expansion and flexibility shown by arrows are maintained and thus a liquid does not leak. That is, the pipe joint comprises a joint main body
62
and a pair of press rings
63
,
63
, and the press rings are clamped by securing tools
64
such as bolts. The joint main body
62
has flange-shaped protruding portions
62
a
,
62
a
opposing to each other. A cylindrical portion
62
b
is provided between these protruding portions
62
a
,
62
a
so as to be integral therewith. A receiving opening portion
62
c
, which is widened outward toward an end portion is provided at an inner periphery of the protruding portion
62
a
. The press ring
63
also has a flange-shaped protruding portion
63
a
. The joint main body
62
is disposed at an outer periphery between the jointed pipes
61
,
61
with a peripheral clearance formed therebetween, the press rings
63
,
63
are disposed at opposite ends of the joint main body and clamped by the securing tools
64
. By clamping with the securing tool
64
, a rubber packing ring
65
disposed between the joint main body
62
and each of the press rings
63
is pressed by a distal end portion of the press ring
63
to be coupled to the receiving opening portion
62
c
, press-contacted to an outer peripheral surface of the jointed pipe
61
, so that the jointed pipes
61
,
61
are jointed together.
In a case of the above-described conventional pipe joint, required components are transported to a field in a state of disassembled. The components are then assembled and applied. Among conventional other pipe joints, a pipe joint which is assembled in advance may be used in order to even further improve workability in the field. Namely, an annular spacer
66
shown in
FIG. 11
is used. As shown in FIG.
12
(
a
), an engaging concave portion
67
a
of a rubber packing ring
67
and an engaging convex portion
66
a
of the spacer
66
are fitted so as to be assembled together. A distal end portion of the rubber packing ring
67
is entered into a receiving opening portion
68
c
of a joint main body
68
, and a press ring
69
is clamped by a securing tool (not shown) until a positioning protrusion
66
b
of the spacer
66
abuts and fits on a corner of an opening edge of the receiving opening portion
68
c
. In this way, temporary assembling is performed. In the temporarily assembled pipe joint, the rubber packing ring
67
is positioned (aligned) by the positioning protrusion
66
b
of the spacer
66
in an axial direction as well as a radial direction.
The pipe joint temporarily assembled by the above-described manner is transported to a field. As shown in FIG.
12
(
b
), the jointed pipe
61
is then inserted. Subsequently, further clamping is performed by the securing tool (not shown) and the positioning protrusion
66
b
of the spacer is bent and rolled. Moreover, as shown in FIG.
12
(
c
), the rubber packing ring
67
is coupled to the receiving opening portion
68
c
in a wedge-shaped manner and press-contacts the outer peripheral surface of the jointed pipe
61
. In this way, operation in the field is rapidly completed.
In a case of the above-described conventional pipe joint with a spacer, however, it is not easy to position the rubber packing ring
65
,
67
in radial and axial directions. Further, there arises a problem in that the positioning protrusion
66
b
of the spacer
66
may be broken during transport and a temporarily assembled state of the pipe joint is broken.
In accordance with the rubber packing ring
65
shown in
FIG. 10
, because a reference for radial and axial positioning is not provided, it is not easy to securely position the rubber packing ring
65
. In accordance with the rubber packing ring
67
shown in
FIG. 12
, the engaging concave portion
67
a
of the rubber packing ring
67
is fitted into the engaging convex portion
66
a
of the spacer
66
and assembled thereto. The press ring
69
is then clamped by the securing tool (not shown) until the positioning protrusion
66
b
of the spacer
66
abuts and fits on the corner of the opening edge of the receiving opening portion
68
. This is burdensome operation and is not easy.
Further, if the temporarily assembled state is broken and the radial and axial position of the rubber packing ring
67
is also shifted, the press ring
69
is dislocated and abuts on the rubber packing ring
67
, and the rubber packing ring
67
is damaged. Alternatively, in a state where the jointed pipe
61
is not inserted, the rubber packing ring
67
moves further deeply into the receiving opening portion
68
c
and thus a diameter of the rubber packing ring
67
is significantly reduced, so that the rubber packing ring
67
becomes defective. At this case, the defective rubber packing ring
67
and the spacer
66
must be removed and a new rubber packing ring
67
and a new spacer
66
must be mounted again. As a result, an operation in the field becomes troublesome.
SUMMARY OF THE INVENTION
An object of the present invention is, in light of the above-described problems of the related art, to provide a spacer-less pipe joint wherein the radial and axial positioning of a packing ring is easily performed and a temporarily assembled state is difficult to break, and to provide a packing ring used for the same.
The aforementioned object is accomplished by the present inventions. Namely, a spacer-less type pipe joint comprising:
a press ring which has a protruding portion at its outer periphery and is fitted to an outer periphery of one end side of a jointed pipe; and
a joint main body which includes i) a protruding portion opposing the protruding portion of the press ring at a side opposing the press ring, and ii) a receiving opening portion which is widened toward the press ring at an inner periphery of the protruding portion of the joint main body so as to be fitted to the outer periphery of the jointed pipe with a peripheral clearance being formed therebetween, characterized in that a securing tool can move the press ring in a direction toward the joint main body; and
a packing ring which is provided between the joint main body and the jointed pipe and fitted into the receiving opening portion by its elastic deformation caused by being directly pressed by the press ring moved by operation of the securing tool,
wherein the packing ring is formed of a distal end portion at a side of the receiving opening portion and a basal portion at a side of the press ring, a diameter of an outer periphery of the distal end portion is substantially the same as an inner diameter of the receiving opening portion such that the distal end portion is temporarily fixed to an entrance of the receiving opening portion, and a diameter of an outer periphery of the basal portion is larger than the outer diameter of the distal end portion only at a portion connecting to the distal end portion, so that a stopper abutting on a peripheral edge outer surface of the receiving opening portion is formed by the outer periphery of the basal portion.
Due to such structure, the distal end portion of the packing ring is temporarily fixed to an entrance of the receiving opening portion such that the stopper of the basal portion of the packing ring abuts on a peripheral edge outer surface of the receiving opening portion of the joint main body. The press ring which is moved by operation of the securing tool abuts on the press ring side end surface of the basal portion of the packing ring. In this way

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