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:
Oct. 11, 1994
Filed:
Oct. 02, 1992
Terry R Mandy, Troy, MI (US);
Robert R Mandy, Bingham Farms, MI (US);
Nazar Bally, Southfield, MI (US);
Man-D-Tec, Inc., Scottsdale, AZ (US);
Abstract
An emergency ventilation system for elevator cabs includes a low voltage power source defined by the secondary winding of a stepdown transformer having its primary winding connected across a primary power source. An emergency power circuit has a single pole, double throw relay located in a normal power position when the primary power source is 'on' wherein it connects the low voltage power source to the ventilating fans. The single pole, double throw relay has an emergency position wherein it is positioned to connect the emergency battery source to the ventilating fans so as to operate them independently of the primary power source for providing uninterrupted ventilation to the elevator cab.