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US 7,017,951 B2Granted
Strengthened pipe fitting having encapsulated reenforcing collar
AssigneeSpears Manufacturing Co.
InventorWayne Spears
Life of this patent
Estimating the term…
Abstract
A strengthened pipe fitting has an internally threaded surface and a compression band. The compression band is sized to compress the internally threaded surface sufficiently so that the pipe fitting is subjected to a compressive preload. The compression band is covered with a non-corrosive material.
Claims20
A strengthened pipe fitting for connecting to an externally threaded member, the strengthened pipe fitting comprising:
- (a) a pipe fitting having an internally threaded surface extending from an attachment end of the fitting to at least a plane of normal wrench tight engagement, the internally threaded surface having (i) a pitch diameter along the internally threaded surface and (ii) an effective thread length which extends from the attachment end to the plane of normal wrench tight engagement;
- and
- (b) a tubular, hollow, metal compression band, fitted onto the attachment end of the pipe fitting, without the externally threaded member connected to the pipe fitting, the compression band radially compressing the attachment end of the pipe fitting and radially and uniformly reducing the pitch diameter along substantially the entire effective thread length from the pitch diameter as originally produced in the pipe fitting;
- wherein the compression band is made from stainless steel and has an external surface which is covered by a non-corrosive material.
1 more element
A strengthened pipe fitting for connecting to an externally threaded member, the strengthened pipe fitting comprising:
- (a) a pipe fitting having an internally threaded surface extending from an attachment end of the fitting to at least a plane of normal wrench tight engagement, the internally threaded surface having (i) a pitch diameter along the internally threaded surface and (ii) an effective thread length which extends from the attachment end to the plane of normal wrench tight engagement;
- and
- (b) a tubular, hollow, metal compression band, fitted onto the attachment end of the pipe fitting, without the externally threaded member connected to the pipe fitting, the compression band radially compressing the attachment end of the pipe fitting and radially and uniformly reducing the pitch diameter along substantially the entire effective thread length from the pitch diameter as originally produced in the pipe fitting;
- wherein the compression band is encapsulated within the pipe fitting.
1 more element
Dependencies are inferred from the claim text.