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:
Mar. 11, 1980
Filed:
Jun. 23, 1978
Charles L Rassieur, St. Louis, MO (US);
Richard R Hesskamp, St. Louis, MO (US);
Central Mine Equipment Company, St. Louis, MO (US);
Abstract
A drill rig hoist has a central shaft upon which a drum is mounted for free rotation. The shaft projects beyond the drum, and has at one end a caliper mounting plate secured to the shaft for rotation with the shaft. Clutch calipers mounted on the caliper mounting plate embrace a clutch rotor fixed to the drum. The drum also has a brake rotor mounted on it. Brake calipers, fixed to a base frame, embrace the brake rotor. The calipers are hydraulically operated, and an accumulator is provided in hydraulic lines to each of the brake and the clutch calipers.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile