Other

Norlin Industries, Inc.

Norman B Erickson

James W Meier

A keyboard assembly incorporates a plurality of key members molded of thermoplastic material, each of the keys having an integrally formed pivot wall supported on a pair of pivot points disposed on a pair of pivot members integral with a pivot bracket. A key guide strip for the key member has a pair of vertically aligned projections, for supporting bumpers which guide the forward end of the key member and which provide a cushioning action for noiselessly stopping of upward movement of the key member.

Keyboard assembly

A dental appliance for evacuating debris and liquid from the mouth during dental operations having a collector member and a resilient collector membrane. The collector member has a semirigid bite block portion adapted to be gripped by the molars of the patient on one or the other side of the mouth with the bite block deforming upon the initial bite of the patient so as to form a mode thereof for secure placement within the patient's mouth and which bite block portion resists further deformation permitting the patient to exert substantial pressure on the bite block portion. The collector also has a combination tongue guard and collector membrane holder formed integrally therewith. The bottom surface of the combination tongue guard and collector membrane holder is contoured to substantially conform to the inner curvature of the patient's lower arches. The combination tongue guard and collector membrane holder also has a slot therein which forms a first and a second foot member on the opposite sides of the slot. The resilient collector membrane is frictionally held within the slot with the major portion of the membrane extending therefrom.

Dental appliance

A switch mechanism designed to overcome the problem of electrical noise employs a compound movable contact assembly, including a coil spring member and a smooth-surfaced wire contact member mounted thereon. The flexing of the coil spring provides an advantageous rolling, wiping motion for the wire contact member, without the noise-producing electrical discontinuities associated with earlier mechanisms in which the coil spring itself made direct electrical contact.

Flexible switch contact having a precious metal contact surface

A keyboard assembly incorporates a plurality of key members molded of thermoplastic material, each of the keys having an integrally formed pivot wall supported on a pair of pivot points disposed on a pair of pivot members integral with a pivot bracket. The key members are located laterally by the pivot wall being gripped between the pivot points, and is located longitudinally relative to the pivot members by means of two pairs of locating ridges, one pair on each side of the pivot wall. A pair of resilient tabs integral with the plastic key member engage the upper corners of the pivot members, and a rib extending downwardly from the pivot wall extends into a slot to resist twisting of the key member. A key guide strip for the key member has a pair of vertically aligned projections, for supporting bumpers which guide the forward end of the key member and which provide a cushioning action for noiselessly stopping of upward movement of the key member. The rear end of the key member has a series of integrally formed transverse walls and projections which permit a preformed actuator wire to be held in a fixed position, without any separate fastening devices.

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Des Plaines, IL, United States of America

Norman B Erickson