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:
Dec. 05, 1995
Filed:
Dec. 28, 1993
Robert H Richardson, Hayesville, NC (US);
Other;
Abstract
Force responsive sensors and circuitry which detect the present and absence of a meterial within a storage bin or hopper and activates a motor to maintain the level of the material within preset limits. The sealed sensors are state-of-the-art force sensing resistive types and the circuitry is all solid-state with no relays or other mechanical devices used. The ON/OFF condition of the motor is controlled by a triac switch whose gate is optically isolated from the control circuitry with the use of a zero-crossing turn on triac optical coupler. The low voltage and low power required to operate the logic and control circuitry is derived from a pair of bridge rectifiers that receive their AC inputs from the voltage across the triac when it is not conducting and from the secondary of a current monitor transformer when the triac is conducting.