Compact multi-speed hammer-drill

Details Compact multi-speed hammer-drill Compact multi-speed hammer-drill

1981-10-19

1983-12-06

Reynolds, Wm. Carter

Tool driving or impacting

Drive controlled by relative axial movement of tool

173 48, 74 22R, 74325, B23B 4502, B23B 4516, B23Q 5027

Patent

active

044187661

ABSTRACT:
A multi-speed hammer-drill has a rotary-reciprocatory output spindle journaled in its housing. A fixed hammer member is mounted about the spindle in a forward portion of the housing and a cooperating hammer member is carried on the spindle. A cam member cooperates with the rearward end of the spindle for selectively changing between drilling and hammer-drilling modes. A three-speed transmission includes an axially-shiftable gear member carried by the spindle and disposed axially between the cam member and the cooperating hammer members with two non-axially movable gears freely rotatably mounted on said spindle one on each side of the axially-shiftable gear. A key is received in a longitudinal keyway in the spindle and keys the axially-shiftable gear member to the spindle. The key has a length substantially equal to the axial distance between the non-axially movable gears for maintaining a spaced relationship therebetween. The keyway is longer than the key to allow the key to slide axially relative to the keyway to accommodate reiprocatory movement of the spindle in the hammer-drilling mode. The axially-shiftable gear serves to provide a direct torque couple between an idler shaft and the spindle, or as a clutch for axially engaging either non-axially movable gear.

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patent: 4027546 (1977-06-01), Alessio
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