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:
Jan. 27, 1976
Filed:
Aug. 01, 1974
Irvin R Danielson, Burr Ridge, IL (US);
Thor Power Tool Company, Aurora, IL (US);
Abstract
A safety control means for a portable power tool, such as a pneumatically driven hand grinder, wherein fluid supply and discharge passages are provided in the support handles of the tool and are respectively connected to the fluid inlet and outlet of the motor. First and second fluid control members are mounted in the handles on the upstream and downstream sides, respectively, of the fluid inlet and outlet of the motor. The first control member is movable to a first position preventing motive fluid from flowing through the supply passage and a second position permitting motive fluid to flow through the supply passage. The second control member is likewise movable to a first position preventing motive fluid from flowing through the discharge passage and a second position permitting flow through the discharge passage. A control lever is pivotally mounted on each of the tool support handles for effecting movement of the respective control members between their first and second positions. Start up and continuous operation of the tool is obtained only so long as both levers are grasped by the operator of the tool and retained in positions holding the control members in their second position.