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:
Jul. 20, 1999
Filed:
Dec. 18, 1997
Robert H Richardson, Hayesville, NC (US);
Other;
Abstract
Normally closed ventilating elements of a livestock building or the like are opened in response to failure of the supply of electrical power to the building ventilating system, an undesired increased temperature within the building or other undesireable conditions such as the inadvertent opening of one or more of the ventilating elements by a control system which includes a source of direct current electricity arranged so as normallly to energize electromagnets and thereby secure their armatures to the electromagnets. The armatures are secured to the handles of winches which are arranged to operate the building curtains or louvers. Power to the electromagnets is controlled through a semiconductor device acting as a switch which is controlled by monitoring circuits and a time delay network. When a response is required the control system deenergizes the electromagnets so as to free their armatures to rotate with the winch handles to open the building emergency ventilating elements. An automatic means is also provided to notify maintenance personnel when a problem occurs.