Pipe joints or couplings – Packed – Gland
Reexamination Certificate
1999-06-07
2001-05-29
Luu, Teri Pham (Department: 3627)
Pipe joints or couplings
Packed
Gland
C285S903000
Reexamination Certificate
active
06237969
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a spirally corrugated pipe-connecting connector which is used to connect a spirally corrugated pipe to a wall of a cable relay site (e.g. a handhole or a manhole) when burying a cable (e.g. an electric cable, a telephone cable or an optical cable) protection conduit in the ground.
2. Related Art
When installing a cable conduit in the ground, handholes or manholes (hereinafter referred to as “handhole”, representing both holes), serving as cable relay sites, have heretofore been provided at suitable intervals along the conduit. As is well known, when forming this handhole, a hole of a required depth is dug in the ground and concrete is placed in the thus dug hole to form a peripheral wall (side wall) of the handhole. At the same time, a through hole for enabling the connection of a cable conduit-forming pipe to the side wall is formed through the side wall of the handhole, and the conduit-forming pipe is connected to this through hole
For connecting the pipe to the side wall or the handhole, mortar was heretofore poured and filled in a gap between the through hole in the side wall and the pipe passed through this through hole, and when the mortar was solidified, the pipe was fixed to the handhole, and a waterproof condition was achieved.
Therefore, in such conventional pipe connecting means, an experience was required in the mortar pouring operation, and much time and labor were required because the waterproof condition must be secured, and an operation for preventing the leakage of the mortar was needed. And besides, a waiting time for the curing of the mortar was required, and even when the connection of the pipe to the handhole was completed, a cable, such as an electric cable, could not immediately be passed through the pipe.
SUMMARY OF THE INVENTION
Therefore, this invention seeks to solve the problems with the conventional means for connecting a pipe to a handhole or the like, and an object of the invention is to provide a novel spirally corrugated pipe-connecting connector which enables the pipe to be quite easily fixed rapidly to the handhole or the like, and maintains a sealed condition between the inside and outside of the pipe, and enables an electric cable or the like to be passed through the pipe immediately after the pipe connecting operation is completed.
The above object of the invention has been achieved by a connector for connecting a spirally-corrugated pipe to a through hole portion of a wall, the connector according to the present invention comprising:
a tubular connector body including,
a tubular portion fixed to the through hole portion,
a spiral projection portion having a spiral projection which defines an inverse thread relative to a spiral formed on an outer periphery of the pipe, the inverse thread having a pitch smaller than a pitch of the spiral of the pipe, and
a outwardly-flared taper portion interposed between the tubular portion and the spiral projection portion,
a holder for holding the pipe to the tubular connector body, a holder including,
a outer spiral projection formed on an outer peripheral surface of the holder and threadedly engaged with the spiral projection portion, and
a inner spiral projection formed on an inner peripheral surface of the holder and threadedly engaged with the spiral formed on the outer periphery of the pipe; and
a packing member disposed between the taper portion of the tubular connector body and a distal end of the outer periphery surface of the pipe for sealing a gap defined between the tubular connector body and the pipe.
REFERENCES:
patent: 861828 (1907-07-01), Grindrod et al.
patent: 1538395 (1925-05-01), Gane
patent: 2172532 (1939-09-01), Fentress
patent: 2503169 (1950-04-01), Phillips
patent: 4289334 (1981-09-01), Riley
patent: 5478123 (1995-12-01), Kanao
patent: 5542718 (1996-08-01), Gronwick et al.
patent: 5794986 (1998-08-01), Gansel et al.
patent: 5845946 (1998-12-01), Thomas
patent: 5971444 (1999-10-01), Hawkins
patent: 6036237 (2000-03-01), Sweeney
patent: 5302 (1904-04-01), None
Luu Teri Pham
McGuireWoods LLP
Totaku Industries, Inc.
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