Cutting by use of rotating axially moving tool – Means to drive tool – Including means to move tool along tool-axis
Patent
1986-05-16
1987-12-01
Weidenfeld, Gil
Cutting by use of rotating axially moving tool
Means to drive tool
Including means to move tool along tool-axis
74371, 74375, 408 20, 408241R, B23B 4714, F16H 332
Patent
active
047100710
ABSTRACT:
A two-speed gear box for handheld electric drills and the like has the movable parts associated with gear changing on or associated with a lay shaft. Gear changing is preferably effected by moving a pair of dogs, slidably mounted in holes through a lay shaft gear, to drivingly engage in either of two dog clutch members on the lay shaft. A thin flexible arm, preferably including a ring around the lay shaft, mounted in cantilever fashion from a movable base effects movement of the dogs. Should the dogs not be in proper register with a respective dog clutch member when changing speed, then the arm flexes and urges the dogs into driving engagement when proper register occurs. A family of two-speed drills having different specialized functions, e.g. a drill, a hammer drill, a screwdriver/drill, a screwdriver, etc., can be produced with the maximum parts in common enabling greater manufacturing flexibility and lower cost of manufacturing the family. Essentially the only parts different for different members of the family need be the gear box output shaft and the specialized function parts associated directly therewith. Advantageously, a family of battery operated tools can be provided in this way.
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Dixon John R.
Koehler Heinrich P.
Bartlett Edward D. C.
Black & Decker Inc.
Murphy Edward D.
Webb Glenn L.
Weidenfeld Gil
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