F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
189/11, 257/28
F16L 55/11 (2006.01)
Patent
CA 1314040
ABSTRACT OF THE DISCLOSURE A tube plug for a heat exchanger tube employs a housing having a conical bore with a blind threaded cylindrical bore. An insert member includes a threaded shank fittable into the blind threaded bore and a conical section with external threads. An eccentric assembly at the forward end of the housing helps lock the housing against rotation as the insert member is threaded thereinto. The threads on the conical section contact, and expand, the conical bore until an external surface of the housing is expanded into sealing contact with the surface of the conical bore. The shape of the threads controls the local pressure exerted on the conical surface. A piggy-back version of the tube plug employs an eccentric assembly for locking a leading tube plug in a heat exchanger tuba and a second tube plug includes a socket in its front end engageable with a nut portion on the leading tube plug. As the second tube plug is expanded into frictional contact with the inside of the heat exchanger tube, this frictional contact adds to the torque-resisting action of the eccentric assembly and the frictional contact of the leading tube plug to permit more torque to be applied to the second tube plug without damaging the heat exchanger tube. Additional tube plugs, identical to the second tube plug may be chained together as necessary.
566213
Epstein Norman
Macrae & Co.
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