Compound tools – Cutter combined with other tool or tools
Patent
1991-07-29
1992-07-14
Parker, Roscoe V.
Compound tools
Cutter combined with other tool or tools
7165, 279145, 408239A, B25F 100, B23B 5112
Patent
active
051291185
ABSTRACT:
An improved drill accessory apparatus primarily adapted for selective connection to a power tool such as an electric drill to provide additional functions for such a power tool such as a screwdriving function. The apparatus thereby enables a user to first drill a hole and then drive a screw into that drilled hole with the same tool and without requiring removal of a drill bit first used to drill the hole. More significantly, the present apparatus provides the aforementioned accessory feature while overcoming certain safety disadvantages present in the most relevant prior art. One such safety-directed improvement of the present apparatus is derived from a structural design which uses a spring positioned entirely within a housing thereby precluding safety risks that might otherwise be encountered if an external spring were employed such as that shown in the prior art. Another such safety-based improvement relates to the use of a sleeve which is specifically designed to remain stationary while the remaining structure of the apparatus may rotate at high speed. This feature allows the user to grasp and stabilize the combination of the accessory of the apparatus and the power tool to which it is connected with his free hand without incurring any risk of injury that is presented in the prior art.
REFERENCES:
patent: 2536017 (1951-01-01), Bamberger
patent: 3484114 (1969-12-01), Rodin
patent: 3932904 (1976-01-01), Nilsson et al.
patent: 4525111 (1985-06-01), Gutsche
patent: 4796319 (1989-01-01), Taft
Parker Roscoe V.
Tachner Leonard
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