Obstruction sensing guard for vertically moving table

Details Obstruction sensing guard for vertically moving table Obstruction sensing guard for vertically moving table

1993-10-20

1995-01-10

Williams, Hezron E.

Measuring and testing

Touch or taste

187269, G01N 3300, B66B 904

Patent

active

053796551

ABSTRACT:
An obstruction sensing guard for use on a vertically-moving lift table for sensing an obstruction and stopping movement of the lift table in response thereto. The guard includes a sensor bar extending vertically below and generally along the table outer perimeter. The sensor bar is hung below the table via flexible connections that allow both horizontal and vertical movement of the sensor bar with respect to the table. The sensor bar is easily assembled with connecting boots at each corner and elongate beams extending therebetween and connected to the boots. Electric contact switches are provided on the sensor bar and are actuated when the sensor bar is moved. The contact switches are retained on the sensor bar with a switch clip that frictionally engages the sensor bar.

REFERENCES:
patent: 4091906 (1978-05-01), Clarke et al.
patent: 4362196 (1982-12-01), Ferdinand et al.
patent: 4392771 (1983-07-01), Smalley
patent: 4556129 (1985-12-01), Martin
patent: 4596412 (1986-06-01), Everett et al.
patent: 4724554 (1988-02-01), Kowalski et al.
Vestil Manufacturing Company, Scissor Tables advertisement/bulletin sheet.

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