Patent ID: 6773245
Filing Date: 2004-08-10
Classification: B29C,B29L

Abstract:
An apparatus comprising: a pair of fluid reservoirs joined through a conduit system to a pair of expandable bladders positioned for encircling a workpiece, a pump engaged with the conduit system so as to enable the directing of a hot fluid from one of the reservoirs to one of the bladders and to enable directing a cold fluid from the other of the reservoirs to the other of the bladders; the bladders mutually joined such that with one of the bladders filled, the one of the bladders is pressed against the workpiece, and with the other of the bladders filled, the pair of the bladders are pressed against the workpiece; whereby heat is delivered to the workpiece when the one of the bladders is filled, and heat is extracted from the workpiece when the other of the bladders is filled.