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:
Jun. 02, 1987
Filed:
Nov. 21, 1985
David B Grimes, Greenfield, MA (US);
Montague Industries, Inc., Turners Falls, MA (US);
Abstract
A novel retrofit process for converting the hydraulic lathe of an existing pulp-grinding machine into the new electric one is described. This process includes utilization of the pre-existing hydraulic cylinder as a supporting housing and shield for a major portion of the drive assembly for the electric lathe. In the preferred 'retrofit' embodiment, the drive for the lathe comprises a ball-screw assembly housed inside the cylinder, after the cylinder has first been evacuated. This drive assembly includes a longitudinally fixed, but rotatable 'power screw' that is supported by opposite ends of the cylinder. A variable speed, reversible motor is located outside one of the cylinder ends and is coupled to the screw to selectively rotate it. A threaded collar is located inside the cylinder and straddles the screw. It carries a pair of parallel, spaced rods that extend through the end of the cylinder that is opposite the cylinder's 'motor end'. These rods are connected to a yoke which, in turn, is connected to the standard carriage-carrying burr mandrel or 'dressing wheel' used in the prior hydraulic lathe.