Keyboard switch assembly having flexible rung ladder contacts

Details Keyboard switch assembly having flexible rung ladder contacts Keyboard switch assembly having flexible rung ladder contacts

1976-05-18

1977-12-27

Scott, James R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200 67DB, 200159A, 200159B, 200275, H01H 1370

Patent

active

040656519

ABSTRACT:
A keyboard having a matrix of keys or pushbuttons arranged in a matrix is ovided with a plurality of stationary electrical contacts arranged in a similar matrix. Movable contacts operated by the pushbuttons are provided by a plurality of ladder-shaped flexible conductive members. Each ladder-shaped member extends along one row of pushbuttons and has a "rung" of the ladder extending through the space between a pushbutton and its associated stationary contact. The body of the keyboard is provided with grooves for inserting the ladder-shaped members and the spacing between these grooves is such that the rung portions of the member are flexed upwardly against the pushbutton and out of contact with the stationary contact when the pushbutton is in the normal position. Each flexed rung exhibits a bistable characteristic so that as a pushbutton is depressed, a point is reached at which less force is required to further depress the pushbutton. The stationary contact extends upwardly a sufficient distance to prevent the rung from assuming the second stable state. Hence, when the pushbutton is released the rung returns to its normal position and in doing so moves the pushbutton back to its normal position.

REFERENCES:
patent: 2320774 (1943-06-01), Flynt
patent: 2658972 (1953-11-01), Brown
patent: 3485974 (1969-12-01), Wolf et al.
patent: 3571540 (1971-03-01), Richards
patent: 3600528 (1971-08-01), Leposavic
patent: 3812313 (1974-05-01), Wolf et al.
patent: 3854018 (1974-12-01), Reynolds et al.
patent: 3941953 (1976-03-01), Misson et al.
patent: 3947390 (1976-03-01), Johnson

Affiliated with

Also associated with

Rating

Keyboard switch assembly having flexible rung ladder contacts does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Keyboard switch assembly having flexible rung ladder contacts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Keyboard switch assembly having flexible rung ladder contacts will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1040273