The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 21, 1991
Filed:
Jul. 31, 1989
Lee A Miller, Novelty, OH (US);
GB Electrical, Inc., Milwaukee, WI (US);
Abstract
A plastic conduit heater for use in the field bending of plastic conduit charaterized by a heat sink pipe segment open at both ends with a resistance heating element wrapped around the exterior of the pipe segment and in intimate contact with the exterior of the pipe segment. The element may be prefabricated and is wrapped in spiral turns which may be more closely spaced toward the ends of the pipe so that the pipe segment is heated uniformly throughout its length. The heating element is encased in insulation which is in turn enclosed in a tubular housing. The housing includes a centrally located handle and an adjustable thermostat for varying the temperature depending on field conditions. One or more plastic conduits or pipes may be positioned in the heater for heating to bending temperature and may be left in the heater until required. The heaters may be arranged in tandem to form heaters of different length.