Dual safety control means for a power tool

Tool driving or impacting – Passage in manipulating handle for drive motor motive fluid – Motive fluid control valve in handle passage

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Details

51170T, 415503, B23B 4504

Patent

active

039346579

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.

REFERENCES:
patent: 762126 (1904-06-01), Bond
patent: 2326396 (1943-08-01), Schaedler
patent: 2382591 (1945-08-01), Warren
patent: 2598907 (1952-06-01), Griffin
patent: 3775851 (1973-12-01), Flatland
patent: 3775911 (1973-12-01), Flagge

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