Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1994-10-28
1996-09-10
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
307112, 604 19, 604 27, 606 32, 606 41, 128760, H01H 3502
Patent
active
055548946
ABSTRACT:
A footswitch for ophthalmic surgery includes a rotatable foot pedal, a spring member which biases the foot pedal to resist rotation and an adjustment mechanism for adjusting the bias of the spring member to a surgeon selected value. In an illustrated embodiment, the adjustment mechanism includes a worm screw gear assembly which is used to vary the amount of torque generated by a coil spring on a shaft upon which a pedal is mounted. As a worm gear is rotated by a thumb wheel, a spur gear is rotated to wind or unwind coil spring thereby increasing or decreasing the amount of tension exerted by coil spring on a shaft.
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Isolab Site Microsurgical, Johnson & Johnson, Catolog 302-5-125, Copyright 1985, p. 4.
Site Microsurgical, Johnson & Johnson, Dec. 1981 Site TXR Catalog, pp. 4 and 7.
Iolab Corporation
Paladini Albert
Shoop Jr. William M.
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