Reversible hammer drill

Details Reversible hammer drill Reversible hammer drill

1978-09-18

1980-10-28

Reynolds, W. Carter

Machine element or mechanism

Mechanical movements

Rotary to or from reciprocating or oscillating

74 22A, 173 48, B23B 4516, F16H 3716, F16H 2512, F16H 2514

Patent

active

042299810

ABSTRACT:
When the hammer drill spindle and chuck are driven forward with the mode selection collar positioned to allow axial movement of the chuck and spindle, the annular ratchet is driven by the spindle through a one way roller clutch so it rides up the sloping surfaces of the fixed annular ratchet and then drops off the tooth corners to deliver a hammer blow of a magnitude determined by the operator pushing on the tool. If the rotation is reversed the clutch prevents rotation of the clutch input and prevents injury to the operator. If the selection collar is moved to lock the lugs in the detent notch of the cam surface the drill can be rotated either direction with the hammer action always locked out.

REFERENCES:
patent: 1656054 (1928-01-01), Gage
patent: 1664625 (1928-04-01), Hulshizer
patent: 2013744 (1935-09-01), Curtis
patent: 2889711 (1959-06-01), Morris
patent: 3190417 (1965-06-01), Bacon
patent: 3563352 (1971-02-01), Stibbe
patent: 3730281 (1973-05-01), Wood
patent: 3736992 (1973-06-01), Zander et al.
patent: 3998278 (1976-12-01), Stiltz et al.
patent: 4066136 (1978-01-01), Wanner et al.

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