Pipe thawing machine

Claim 2

In apparatus for thawing a frozen pipe by inserting a flexible tube therein and forcing hot water from a heated reservoir through the tube while advancing the tube as the ice melts, said apparatus including a hollow member having a fitting for watertight connection to the end of the pipe to be thawed and a return connection communicating with said reservoir, a flexible tube having an opening at one end, communicating with said reservoir at the other end and adapted to be passed through said hollow member and advanced into said pipe, and means for forcing hot water from said reservoir through said tube into said pipe to thaw ice therein as said tube is advanced, the return water and melt returning to said reservoir through said return connection, the improvement comprising a tube guiding and sealing unit arranged to be mounted within said hollow member, said unit comprising a hollow sleeve of lesser outer diameter than the inner diameter of said member, means for mounting said sleeve within said member, a sealing fitting for making a watertight connection to the end of said member through which said unit is inserted, said fitting including an opening through which said tube may pass, and sealing means within said sleeve for sliding sealing engagement with the outer surface of said tube, whereby said tube may be advanced through said unit into the pipe to be thawed and return water and melt may flow to said return connection between the outer surface of said sleeve and the inner surface of said hollow member.

Claim 3

In combination with apparatus for thawing a frozen pipe by inserting a flexible tube therein and forcing hot water from a heated reservoir throught the tube to melt the ice, while advancing the tube as the ice melts, said apparatus including a portable main frame, a storage tank comprising said reservoir mounted on said frame, a heating element for heating water in said tank, a pressure tank mounted on said frame, a pressure controlled pump mounted on said frame for pumping hot water from said storage tank into said pressure tank, a hollow member having a fitting for watertight connection to the end of the pipe to be thawed, a return conduit connecting said member to said storage tank, a length of flexible tube with an opening at one end and connected to said pressure tank at the other and arranged to pass through said hollow member into said pipe, a tube guiding and sealing unit arranged to be mounted within said hollow member, said unit comprising a hollow sleeve of lesser outer diameter than said member, means for mounting said sleeve within said member, a sealing fitting for making a watertight connection to the end of said member through which said unit is inserted, said fitting including an opening through which said tube may pass, and sealing means within said sleeve for sliding sealing engagement with the outer surface of said tube, whereby said tube may be advanced through said unit into the pipe to be thawed and return water and melt may flow to said return conduit between the outer surface of said sleeve and the inner surface of said hollow member.

Claim 4

In combination with apparatus for thawing a frozen pipe by inserting a flexible tube therein and forcing hot water from a heated reservoir throught the tube to melt the ice, while advancing the tube as the ice melts, said apparatus including a portable main frame, a storage tank comprising said reservoir mounted on said frame, a heating element for heating water in said tank, a pressure tank mounted on said frame, a pressure controlled pump mounted on said frame for pumping hot water from said storage tank into said pressure tank, a hollow member having a fitting for watertight connection to the end of the pipe to be thawed, a return conduit connecting said member to said storage tank, a length of flexible tube with an opening at one end and connected to said pressure tank at the other and arranged to pass through said hollow member into said pipe, a tube guiding and sealing unit arranged to be mounted within said hollow member, said unit comprising a hollow sleeve of lesser outer diameter than said member, means for mounting said sleeve within said member, a sealing fitting for making a watertight connection to the end of said member through which said unit is inserted, said fitting including an opening through which said tube may pass, and sealing means within said sleeve for sliding sealing engagement with the outer surface of said tube, whereby said tube may be advanced through said unit into the pipe to be thawed and return water and melt may flow to said return conduit between the outer surface of said sleeve and the inner surface of said hollow member.