Hammer-drill for masonry fasteners

Details Hammer-drill for masonry fasteners Hammer-drill for masonry fasteners

1982-06-11

1984-09-04

Smith, James G.

Compound tools

Cutter combined with other tool or tools

81464, 408 36, B25F 300

Patent

active

044688261

ABSTRACT:
A hammer-drill is adapted for drilling a hole in masonry and subsequently driving a threaded masonry fastener therein. The hammer-drill has a driving output shaft nested concentrically within a driving output sleeve. The shaft and sleeve both extend forwardly of the tool housing, and both are driven continuously by respective gearing in the tool. The sleeve, however, is driven at a substantially lower rpm than the shaft and at a higher torque. After the hole is drilled, a tubular member is releasably and drivingly coupled to the sleeve. The tubular member encloses the masonry drill bit, which is continually rotated, and the drill bit need not be removed from the tool to seat the fastener. The tubular member has a forward portion provided with a socket for the head of the masonry fastener.

REFERENCES:
patent: 1216047 (1917-02-01), Backscheider
patent: 2838962 (1958-06-01), Curtis
patent: 3484114 (1969-12-01), Rodin
patent: 3696693 (1972-10-01), Bosten et al.
patent: 3932904 (1976-01-01), Nilsson et al.
patent: 3937119 (1976-02-01), Ernst
patent: 3965510 (1976-06-01), Ernst
patent: 4303357 (1981-12-01), Makar

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