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:
Feb. 24, 1976
Filed:
Jan. 21, 1974
Irvin R Danielson, Burr Ridge, IL (US);
Thor Power Tool Company, Aurora, IL (US);
Abstract
A throttle valve construction for a pneumatic paving breaker and other types of percussion tools employing a reciprocating piston to impart blows to a work steel or the like is disclosed, wherein partial movement of the control lever of the tool from a fully depressed position to a partially depressed position permits the throttle valve to shift to a position which substantially reduces the quantity of air under pressure being supplied to the operating cylinder of the tool so that the reciprocation frequency and kinetic energy of the piston are reduced. The amplitude and frequency of the vibrations generated by the tool and transmitted to the operator thereof are likewise substantially reduced when the tool is operating in this mode, and a significant reduction in the level of the sound emitted by the tool is also obtained.