Three-speed gear mechanism for a power tool

Details Three-speed gear mechanism for a power tool Three-speed gear mechanism for a power tool

F - Mech Eng,Light,Heat,Weapons

16

H

74/188

F16H 3/22 (2006.01) B23B 45/00 (2006.01)

Patent

CA 1130613

ABSTRACT A three-speed gear mechanism for a power tool includes a high speed gear and a low speed gear journalled to the output spindle and an intermediate speed gear keyed to the spindle between the high and low speed gears. The intermediate speed gear serves the dual function of providing a direct torque couple between the idler shaft and spindle in the intermediate speed position and a clutch for transmitting torque from the high and low speed gears to the output spindle in the high and low speed conditions. In addition, in connection with the application of the present invention to a hammer drill to which it is particularly suited, the present invention includes novel means for accommodating the reciprocatory movement of the output spindle while maintaining proper relative positioning between the high and low speed gears.

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