US 5,329,094 AGranted

Portable radiant heater for performing splices in waterstop

AssigneePaul Murphy Plastics Company

InventorsPaul R. Murphy, Paul A. Kepler

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Abstract

A portable radiant heating apparatus is provided for performing splices in waterstops. The heating apparatus includes a pair of radiant quartz heating elements that are mounted intermediate the end members of a generally rectangular-shaped frame. The heating elements are preferably positioned in parallel fashion one above the other. Heat deflecting shields are mounted to the top and bottom frame members proximate to the heating elements to concentrate the radiant heat along the sides of the heating apparatus. A splicing operation is performed by positioning the ends of two waterstop sections to be joined adjacent to and on opposite sides of the heating apparatus so that the ends of the two waterstop sections are exposed to the radiant heat from the heating apparatus. Once the waterstop sections have been sufficiently heated to cause the ends thereof to begin to melt, the waterstop sections are removed from the heating apparatus and the ends therefor pressed and held together until the waterstop material cools, thereby forming a water-tight seam.

Claims4

Dependent claims

A method of performing a butt-type splice to join the edges of first and second end sections of waterstops, comprising:

providing a portable radiant heating device having a frame defining open regions on either side thereof, an elongated quartz heating element mounted in the frame and having a length greater than the width of said waterstop sections, and heat deflection means for directing heat generated by the heating element outwardly through said open regions to thereby create first and second external heating zones adjacent to said open regions on either side of said frame;
energizing the heating element in the heating device to radiate heat into said first and second external heating zones;
positioning said first and second waterstop end sections in said first and second external heating zones respectively such that said end sections are subjected to said radiated heat without contacting said heating device;
maintaining said end sections in said heating zones for a time period sufficient to soften said end sections and initiate melting of the edges thereof;
removing said end sections from said heating zones;
joining said end sections together so that the respective edges thereof fuse together and form a bead along the seam between said two sections;
and
holding said two end sections together until the end sections cool sufficiently to harden the bead formed along the seam.

5 more elements

Dependencies are inferred from the claim text.