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:
Jun. 15, 1993
Filed:
Oct. 08, 1991
Eugene S Denysenko, Crystal, MN (US);
Guy T Thompson, St. Paul, MN (US);
Deltak Corporation, Minneapolis, MN (US);
Abstract
A heat exchanger has a duct with a tube assembly supported by a hanger that extends through an opening in the roof of the duct. A jack is provided to raise and lower the tube assembly during maintenance. The jack includes a base with an aperture therethrough and a pair of rollers attached to the underside of the base so that the jack can be moved across the roof. A pair of fluid operated cylinders are mounted on the base and project upward on opposite sides of the aperture. A jacking frame is attached to the other ends of both the cylinders and a rod extension passes through the base aperture for connecting the jacking frame to the hanger.