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:
May. 16, 1989
Filed:
Oct. 21, 1987
Lynn A Schmelzer, Kewanee, IL (US);
William M Smith, Kewanee, IL (US);
Raymond S Merritt, Geneseo, IL (US);
Hyster Company, Portland, OR (US);
Abstract
Vibration is generated by the rotation of an eccentric weight attached to a rotor shaft. A relatively high or low amplitude of vibration is produced by varying the radial position of the eccentric weight relative to the centerline of the rotor shaft. A latch, responsive to the direction of rotation of the rotor shaft, and springs control the radial movement of the eccentric weight. Rotation of the rotor shaft in one direction will cause the eccentric weight to be restrained in close proximity to the shaft, producing relatively low vibration amplitude. Rotation in the opposite direction, will cause the eccentric weight to be released; permitting the eccentric weight to move radially from the rotor shaft under the influence of centrifugal force; producing a higher amplitude of vibration. Springs automatically return the eccentric weight to the low amplitude position when the rotor shaft slows.