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US 5,642,912 AGranted
Pulling attachment for plastic pipe and slip lining head
AssigneeTTI Trenchless Technologies, Inc.
InventorRobert O. Parish, II
Life of this patent
Estimating the term…
Abstract
The present invention is directed to an attachment for a plastic pipe, usually polyethylene pipe, to a head for pulling the pipe into a sewer or other utility line. The present invention is also directed to a slip lining head. More specifically, the present invention is directed to a slip lining head which includes the unique attachment for a plastic pipe used in the repair/replacement of sewer and other utility lines.
Claims12
An attachment for attaching plastic pipe to a pulling head comprising:
- a body having an inner cavity, said body having a front end and a back end and a cylindrical portion with an inside diameter which is essentially the same as the outside diameter of said pipe;
- and
- a wedging means located in said cavity which rotates within said body and moves relative to said body and enters said pipe and wedges said pipe against said cylindrical portion of said body, said wedging means comprising
- a self-threading tap located within said cylindrical portion of said body;
- a rotatable shaft fixed to said tap and extending through said front end of and rotatable relative to said body;
- and
- means on said shaft to retain said tap within said cylindrical portion of said body.
4 more elements
A slip lining head comprising:
- a body having a front end and a back end and having two outside surfaces which are inclined to the horizontal axis of said body, said surface nearest said front end having an angle greater than 45.degree. and less than 70.degree. and said second surface having an angle greater than 10.degree. and less than 25.degree., said second surface terminating nearest said back end in a square shoulder, said body having an inner cavity;
- and
- means within said cavity for attaching a polyolefin pipe.
A slip lining head for pulling a plastic pipe comprising:
- a body having a front end and a back end and having two outside surfaces which are inclined to the horizontal axis of said body, said surface nearest said front end having an angle greater than 45.degree. and less than 70.degree. and said second surface having an angle greater than 10.degree. and less than 25.degree., said second surface terminating nearest said back end in a square shoulder;
- said body having an inner cavity which forms a cylindrical portion at said back end with an inside diameter which is essentially the same as the outside diameter of said pipe;
- and
- a wedging means located in said cavity which moves relative to said body and enters said pipe and wedges said pipe against said cylindrical portion of said body.
1 more element
Dependencies are inferred from the claim text.