Motor-driven portable hammer

Details Motor-driven portable hammer Motor-driven portable hammer

1973-02-07

1978-02-07

Purser, Ernest R.

Tool driving or impacting

Impacting devices

Impact transmitting anvil

173133, 173139, 173162, B25D 1704, B25D 1708

Patent

active

040721990

ABSTRACT:
A housing has a tool mounted therein so that a portion of the tool can slide for reciprocatory movement deeper into and farther out of the housing. A prestressed biasing spring or a cushion of gas is interposed between and acts upon the housing and the aforementioned portion of the tool, being prestressed to an extent which is less than the minimum force with which the tool can engage a workpiece when the tool is pushed against the workpiece by the weight of the hammer, and which biasing means has a flat spring characteristic.

REFERENCES:
patent: 1896992 (1933-02-01), Agren
patent: 2440834 (1948-05-01), Sims
patent: 2936743 (1960-05-01), Colgate
patent: 3266581 (1966-08-01), Cooley et al.
patent: 3326303 (1967-06-01), Jones, Jr.
patent: 3404877 (1968-10-01), Darnell

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