Piezoresistive elevator button

Details Piezoresistive elevator button Piezoresistive elevator button

1990-07-19

1991-08-20

Pellinen, A. D.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 300

Patent

active

050406400

ABSTRACT:
A piezoresistive elevator button assembly comprises a polymer film piezoresistive element sandwiched between a button and a button pressure plate, and circuitry for sensing a change in the resistance of the piezoresistive element. The piezoresistive element is held in place by a high temperature potting compound to create a button less sensitive to fire or heat. A compensating spring is placed between the piezoresistive element and the buttom pressure plate to eliminate the effect on that element due to temperature cycling of the button assembly elements. A frustoconical housing of the button employing catch teeth allows for little movement; the use of the polymer film piezoresistive element allows a signal to be generated though buttom movement is nearly imperceptible.

REFERENCES:
patent: 4166269 (1979-08-01), Stephens et al.
patent: 4419598 (1983-12-01), Spitz et al.
patent: 4805739 (1989-02-01), Lind et al.

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