Hammer drill

Details Hammer drill Hammer drill

1977-03-14

1978-12-26

Staab, Lawrence J.

Tool driving or impacting

Drive adjustable to completely change kind of drive

Adjustable to impacting device

173133, 279 193, 279 75, 173139, E02D 702, B23B 534

Patent

active

041311655

ABSTRACT:
A hammer drill has a movable tool and a driving element substantially coaxial with the tool. The driving element directly transmits axial impact from the same to the tool without transmission of torque. A tool holder surrounds proximal end portions of the driving element and the tool and transmits torque from the former to the latter without transmission of axial impact. Drive means are provided for selectively imparting torque and/or axial impact to the driving element. The tool holder comprises a sleeve which surrounds the proximal end portions. The sleeve is axially movable relative to the driving element and the tool and, at the same time, are connected with them for joint rotation therewith. An additional sleeve is provided surrounding the sleeve and enabling an operator to hold and to guide the hammer drill.

REFERENCES:
patent: 1208141 (1916-12-01), Greve
patent: 1657317 (1928-01-01), Potter
patent: 1880337 (1932-10-01), App
patent: 2608413 (1952-08-01), Peck
patent: 2767957 (1956-10-01), Feucht
patent: 3828863 (1974-08-01), Bleicher et al.
patent: 3874460 (1975-04-01), Schmid et al.

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