Ergonomic handle for hand tool

Details Ergonomic handle for hand tool Ergonomic handle for hand tool

1982-07-28

1984-12-18

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Handle clutched to head

81177R, 81177B, 145 61R, 145 75, D 8 25, B25B 1346, B25G 100

Patent

active

044884605

ABSTRACT:
An improved ergonomic handle for a hand tool or other implement has a substantially elliptical cross-section taken in a first plane which forms a dihedral angle of approximately thirty (30) degrees with respect to a second plane which is normal to the longitudinal axis of the shank of the tool. The length of the minor axis of the elliptical cross-section is approximately sixty percent (60%) of the length of the major axis. The longitudinal axis of the shank passes through the elliptical cross-section and through the line formed by the intersection of the first and second planes. The handle is formed substantially as a revolution of the elliptical cross-section about its major axis. As a result, the handle is well balanced and accommodates a variety of hand grips for various uses or orientations of the tool, and the handle is convenient and comfortable for substantially reducing operator fatigue over extended use of the tool. This is especially advantageous in connection with a hand ratchet tool.

REFERENCES:
patent: 176811 (1876-05-01), Richards
patent: 347054 (1886-08-01), Morse
patent: 666512 (1901-01-01), Furbish
patent: 1980087 (1934-11-01), Rast
patent: 2720296 (1955-10-01), Briglia
patent: 3080900 (1963-03-01), Rosenberg
patent: 3824881 (1974-07-01), Wright
patent: 3893205 (1975-07-01), Anderson et al.
patent: 3908487 (1975-09-01), Plaw
patent: 4090298 (1978-05-01), Rushforth

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