Roll grooved pipe
First Claim
Patent Images
1. Roll grooved pipe having an outer surface, an inner surface, and a cold rolled groove formed in said outer surface, said pipe having a configuration, when viewed in longitudinal cross-section, comprised by:
- a radially extending end wall of said pipe;
outer and inner wall portions extending from said end wall and terminating at said rolled groove;
said rolled groove having a profile which includes a first outer radially extending wall portion terminating at said outer wall portion and extending radially inwardly of said pipe;
an axially extending wall portion terminating at an inner periphery of said radially extending wall portion; and
, a second radially extending wall terminating at said axially extending wall and having a height less than that of said first radially extending wall;
an outer frusto-conical wall portion terminating at said second radially extending wall portion, and extending axially of said pipe in divergent relationship relative to a central axis of said pipe;
said inner wall having a profile that includes an inner radially inwardly extending wall portion terminating at said inner wall portion;
an axially extending inner wall portion terminating at an inner periphery of said radially inwardly extending wall portion and extending axially of said pipe; and
,a straight sided frusto-conical wall portion commencing at said axially extending inner wall portion and extending axially of said pipe in divergent relationship relative to said central axis of said pipe to a termination of said straight sided frusto-conical wall portion at said inner surface of said pipe;
said inner frusto-conical wall portion providing a smooth and uninterrupted linear transition between said inner surface of said pipe and said inner axially extending wall portion of said groove.
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Accused Products
Abstract
A roll grooved pipe is provided on its inner surface with a hydrofoil surface providing a transition between the inner surface of the pipe and the radially innermost portion of a radially inwardly extending step formed in the inner wall of the pipe by the cold rolling of the groove in the pipe.
58 Citations
7 Claims
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1. Roll grooved pipe having an outer surface, an inner surface, and a cold rolled groove formed in said outer surface, said pipe having a configuration, when viewed in longitudinal cross-section, comprised by:
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a radially extending end wall of said pipe; outer and inner wall portions extending from said end wall and terminating at said rolled groove; said rolled groove having a profile which includes a first outer radially extending wall portion terminating at said outer wall portion and extending radially inwardly of said pipe; an axially extending wall portion terminating at an inner periphery of said radially extending wall portion; and
, a second radially extending wall terminating at said axially extending wall and having a height less than that of said first radially extending wall;an outer frusto-conical wall portion terminating at said second radially extending wall portion, and extending axially of said pipe in divergent relationship relative to a central axis of said pipe; said inner wall having a profile that includes an inner radially inwardly extending wall portion terminating at said inner wall portion; an axially extending inner wall portion terminating at an inner periphery of said radially inwardly extending wall portion and extending axially of said pipe; and
,a straight sided frusto-conical wall portion commencing at said axially extending inner wall portion and extending axially of said pipe in divergent relationship relative to said central axis of said pipe to a termination of said straight sided frusto-conical wall portion at said inner surface of said pipe; said inner frusto-conical wall portion providing a smooth and uninterrupted linear transition between said inner surface of said pipe and said inner axially extending wall portion of said groove. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Roll grooved pipe having an internal radially inwardly extending step formed on an inner surface of said pipe, further including a frusto-conical surface portion on said pipe inner surface providing a transitional hydrofoil surface interconnecting the inner axial wall of said pipe and a radially innermost axially extending wall of said step.
Specification