Abstract A pipe coupling including a collar provided with external flanges initially larger than the normal diameter of the collar which, in the course of installation, are constricted until their outer surfaces are essentially flush with the normal surface of the collar causing the portions radially inward of the external end flanges to inbed into pipe ends inserted in the collar. An insulating sealing sleeve is interposed between the collar, including the external flanges and both of the pipe ends to form, when compressed, a seal between the collar and both pipe ends as well as an insulation barrier between the collar and one of the pipe ends. A second insulating sleeve including a flange is disposed within the pipe ends, the flange being disposed between the pipe ends.
A constricted collar pipe coupling, comprising: a. an inner sleeve of electrical insulating material having an external stop flange; b. a pair of pipe ends initially fitted over the sleeve and abutting the stop flange; c. an outer sleeve of electrical insulating material fitted over the pipe ends; d. and a collar formed of mallable material having initially a cylindrical bore receiving the outer sleeve, pipe ends and inner sleeve; e. said collar having, initially, a cylindrical outer surface interrupted by at least a pair of external flanges of uniform thickness overlying each pipe end; f. said flanges being constricted to essentially the same dimension of the outer cylindrical surface of the collar therebetween producing a pair of undulated depressions in each pipe end and corresponding portions of the sleeves and inner surface of the collar.
Claim 2
Dependent Claim
136 words
A constricted collar pipe coupling, comprising: a. an inner sleeve of electrical insulating material having an external stop flange; b. a pair of pipe ends initially fitted over the sleeve and abutting the stop flange; c. an outer sleeve of electrical insulating material fitted over the pipe ends; d. and a collar formed of mallable material having initially a cylindrical bore receiving the outer sleeve, pipe ends and inner sleeve; e. said collar having, initially, a cylindrical outer surface interrupted by at least a pair of external flanges of uniform thickness overlying each pipe end; f. said flanges being constricted to essentially the same dimension of the outer cylindrical surface of the collar therebetween producing a pair of undulated depressions in each pipe end and corresponding portions of the sleeves and inner surface of the collar.
Claim 3
Dependent Claim
56 words
A constricted collar pipe coupling, as defined in claim 1, wherein: a. one end of the collar projects axially beyond the outer sleeve and includes an internal flange; b. one of the external flanges overlies the internal flange causing the internal flange to press against the underlying tube end upon said constriction of the outer flange.