Pipe joints or couplings – Packed – Sleeve
Reexamination Certificate
2000-05-23
2002-04-09
Wilson, Neill (Department: 3627)
Pipe joints or couplings
Packed
Sleeve
C285S367000, C285S411000, C285S903000
Reexamination Certificate
active
06367849
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a joint used to connect together two synthetic resin corrugated pipes each including a pipe wall which comprises a sectionally square wall portion and a sectionally circular wall portion alternately in the axial direction of the pipe as well as an annular-shaped projecting strip portion formed in the sectionally circular wall portion.
Conventionally, there are known various types of synthetic resin corrugated pipes and also there are manufactured and used various types of connecting joints suitable for connection of the respective pipe structures of such synthetic resin corrugated pipes. These joints can be roughly classified into a synthetic resin corrugated pipe whose main body is formed in a cylindrical shape and a synthetic resin corrugated pipe which includes at least two main bodies formed as at least two split bodies. The present invention relates to the latter type of joint including at least two split main bodies.
Both of the conventional pipe joints of a cylindrical main body type and of at-least-two-split-main-body type have a diameter larger than the outer peripheral diameter of pipes to be connected together by the pipe joint or have a size larger than the outer peripheral shape of such pipes. That is, either of the conventional pipes joint has a shape which projects outwardly of the outer peripheries of the pipes to be connected together by the pipe joint.
Thus, after the two pipes are connected together by the joint, the connected portions of the pipes become larger in size. For this reason, it is rather considered as common knowledge that, at least in the portions of the pipes where the joint is present, a plurality of pipes cannot be arranged side by side or on top of one another in such a close contact manner as in the non-connected portions of the pipes.
SUMMARY OF THE INVENTION
As described above, the present invention relates to a joint used to connect together two synthetic resin corrugated pipes each including a pipe wall comprising a sectionally square wall portion and a sectionally circular wall portion alternately formed in the axial direction of the pipe as well as an annular-shaped projecting strip portion formed in the sectionally circular wall portion. That is, it is an object of the invention to provide a joint which, even in case where the joint connects two pipes together, does not project from the outer peripheries of the pipes to become larger in size than such pipes outer peripheries in the connected portions of the pipes. Also, it is another object of the invention to provide a method for connecting together the pipes of the above-mentioned type using a joint according to the invention, in which a plurality of pipes, even in case where they have portions that are connected together by the joint, can be arranged side by side or piled up on top of one another in the connected portions thereof in such a close contact manner as in the non-connected portions thereof.
Now, describing the structure of the invention employed to attain the above objects using reference characters used in the following description of the preferred embodiments of the invention, for connection of a synthetic resin corrugated pipe P in which a pipe wall
1
comprises a sectionally square wall portion
2
and a sectionally circular wall portion
3
formed alternately in the axial direction of the pipe P, while the sectionally circular wall portion
3
includes an annular-shaped projecting strip portion
4
, there is provided a joint which comprises: two synthetic resin joint main bodies
10
respectively comprising two semicircular-shaped split bodies; and, two watertight packings
20
respectively formed of elastic material, while each packing
20
includes two flanges
22
,
22
respectively projecting from the two end portions of a semicircular portion
21
of the packing
20
in the outer peripheral direction thereof. Each joint main body
10
is structured such that, except for its two side edge portions
14
,
14
in the width direction thereof, it is formed as a recessed groove
13
for receiving its associated packing
20
and includes tightening bolt holes
15
,
15
respectively formed in the two end portions
12
,
12
of the main body
10
in the peripheral direction thereof. And, each watertight packing
20
is structured such that the width-direction central portion of a semicircular-shaped portion
21
thereof is formed as a projecting portion
23
projecting on the inner surface side thereof and the two side edge portions of the packing
20
are respectively formed as recessed portions
24
,
24
recessed on the outer peripheral surface side of the packing
20
. Also, in a state where the packing
20
is mounted into the joint main body
10
, the two side recessed portions
24
,
24
are recessed more deeply on the outer peripheral surface side of the joint than the two side edge portions
14
,
14
of the joint main body
10
, and the surface portions f, f of the two end portions of the packing
20
in the peripheral direction thereof project further outwardly of the surface portions F, F of the two end portions
12
,
12
of the joint main body
10
by a proper thickness t.
Also, according to the invention, there is provided a method for connecting a synthetic resin corrugated pipe P in which, as described above, a pipe wall
1
comprises a sectionally square wall portion
2
and a sectionally circular wall portion
3
formed alternately in the axial direction of the pipe P, while the sectionally circular wall portion
3
includes an annular-shaped projecting strip portion
4
. In the present connecting method, using a joint which comprises two synthetic resin joint main bodies
10
respectively comprising two semicircular-shaped split bodies and further includes tightening bolt holes
15
,
15
respectively formed in the two end portions
12
,
12
of each main body
10
in the peripheral direction thereof, the respective ends of two pipes P, P to be connected together, after they are cut except for the annular-shaped projecting strip portions
4
of the sectionally circular wall portions
3
of the two pipes P, P, are butted against and connected to each other while the sectionally square wall portions
2
of the two pipes P, P are held at the same posture in the peripheral direction thereof; two watertight packings
20
are respectively inserted into the connected portions of the two pipes P, P; and, the two joint main bodies
10
are tightened and connected together on the diagonal line of the sectionally square wall portions
2
of the two pipes P, P to thereby connect together the two pipes P, P.
Further, the above-mentioned object can be attained by a joint for connection of synthetic resin corrugated pipesP, according to the present invention, each of the corrugated pipes including a pipe wall
1
which comprises a sectionally retangular wall portions
2
and a sectionally circular wall portions
3
disposed alternately in a longitudinal direction of the corrugated pipe wherein each of the sectionally circular wall portions
3
includes an annular-shaped protrusion
4
which projects outwardly from the sectionally circular wall portions that is disposed substantially at a center of the sectionally circular wall portion between adjacent sectionally rectangular wall portions in the longitudinal direction, the joint comprising:
a pair of semicircular-shaped joint main bodies
10
coupled with each other by bolts, each having a recessed groove
13
defined by its both side edge portions
14
,
14
in a width direction thereof and also having tightening bolt holes
15
,
15
respectively formed at both peripheral end portions
12
,
12
in a peripheral direction thereof; and
a pair of watertight packings
20
respectively formed of elastic material and respectively received in the recessed grooves
13
of the semicircular-shaped joint main bodies
10
, each of the watertight packings
20
having a semicircular portion
21
which includes two edge portions
24
,
24
disposed at two end por
Mochiduki Takeshi
Takenaka Kentaro
Tatsuta Yoshiaki
Yamashita Kazuya
McGinn & Gibb PLLC
Totaku Industries, Inc.
Wilson Neill
LandOfFree
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