초록 ▼

A leakage testing apparatus includes a pull bar surrounded by an array of arcuate segments having teeth that engage and deform the inner surface of a tube. When tension is applied to the pull bar, a cam forces the segments to move outwardly to contact the tube while maintaining a parallel relationsh

A leakage testing apparatus includes a pull bar surrounded by an array of arcuate segments having teeth that engage and deform the inner surface of a tube. When tension is applied to the pull bar, a cam forces the segments to move outwardly to contact the tube while maintaining a parallel relationship to said pull bar.

대표청구항 ▼

An apparatus for detecting leaks between a tube and a surrounding structure, said apparatus comprising: a head including an outer seal arranged to engage said surrounding structure and prevent fluid from passing between said head and said surrounding structure; an elongated pull bar extending throug

An apparatus for detecting leaks between a tube and a surrounding structure, said apparatus comprising: a head including an outer seal arranged to engage said surrounding structure and prevent fluid from passing between said head and said surrounding structure; an elongated pull bar extending through said head and axially slidable therein to be inserted axially in said tube; a plurality of separate arcuate rigid steel segments arranged to encircle said pull bar and defining a circumferential groove on the outer surface thereof, each of said segments having elongated ridge-like circumferential teeth thereon for engaging and deforming the inner surface of said tube to prevent axial movement of said segments relative to said tube, said segments each having a spreader surface thereon that defines parts of the surface of a cone surrounding said pull bar; a resilient band surrounding said segments, disposed within said groove and urging said segments radially inwardly toward said pull bar; tensioning means for urging said free end of said pull bar toward said segments, said tensioning means including a first member for applying torque to said pull bar and a second member that threadedly engages said pull bar and is rotatable with respect thereto for applying an axial restraining force to said segments; seating means for urging said head axially with respect to said pull bar against said surrounding member, said seating means comprising an additional member that threadedly engages said pull bar and is rotatable with respect thereto; cam means responsive to axial movement of said pull bar for forcing said segments to move radially outwardly while maintaining a parallel relationship to said pull bar, said cam means comprising a cam ring encircling said pull bar, said cam ring having a conical cam surface thereon that mates with said spreader surfaces, forms an angle of about 30 degrees with said pull bar and at least part of which is surrounding by said resilient band; an inner seal encircling said pull bar and engageable with the inner surface of said tube to prevent fluid from flowing past said inner seal into said tube; and a passageway extending through said head whereby fluid cam flow up to said outer and inner seals.