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. 07, 1986
Filed:
Apr. 14, 1981
Joseph Batch, Milwaukee, WI (US);
Robert G Stafford, Mequon, WI (US);
Telsmith Division Barber-Greene Company, Milwaukee, WI (US);
Abstract
The crusher of this invention has a conical crushing head that gyrates in an annular lower frame member. An upper frame member that seats on the lower frame member in a normal operative position comprises a bowl that cooperates with the head to define a crushing gap. Upright, circumferentially spaced double-acting hydraulic jacks are connected between the lower frame member and a tie ring surrounding it; and upright, circumferentially spaced tie rods connect the tie ring with the upper frame member. Preferably the piston rods of the jacks project downward. The upper jack chambers are normally communicated with a fluid pressure system that maintains fluid in them at a predetermined pressure and comprises an accumulator charged by a hydraulic pump that is controlled by a pressure responsive switch. A relief valve near each jack vents fluid from its upper chamber to its lower one when pressure in said upper chamber exceeds said predetermined value by a predetermined amount, as when tramp iron lifts the bowl. The lower chambers are normally communicated with a source of unpressurized fluid. A selector valve reverses the connections to the jack chambers for bowl lifting.