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:
Jan. 03, 1978
Filed:
Apr. 30, 1976
Gilbert F Shultz, Novi, MI (US);
Whitlock, Inc., Farmington, MI (US);
Abstract
A versatile control for a plural-material vacuum hopper loader comprising a blowback timer which generates a blowback enabling signal for a time interval T2, a blowback signal generator which develops a series of blowback pulse signals of adjustable duration, and blowback logic which actuates an air supply to apply pulses of air to the hopper loader during interval T2. A fill timer generates a fill enabling signal over a time interval T3, and a fill signal generator develops a repeating sequence of fill actuating signal pulses of adjustable relative duration; the fill enabling signal energizes an evacuation apparatus to evacuate the hopper continuously during interval T3 whereas fill logic actuates fill control valves (one for each material) in the repeating sequence of the fill actuating signal pulses throughout the same interval. Each timer effectively resets the other; for a hopper loader using a local blower as the evacuating apparatus, an additional coastdown (idle) timer is used to afford an idle time T1 between intervals T3 and T2.