US 4,144,511 AGranted

Push-button mechanisms and equipment including them

AssigneeSmiths Industries Limited

InventorFrederick J. Collings

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Abstract

A push-button mechanism for tuning a radio receiver includes push-buttons that are actuable to rotate a turrent tuner to different extents for station selection. The side of each push-button contacts one end of an individual lever to pivot it through a predetermined angle upon actuation of the push-button. The other end of the lever contacts one of several projections on a bar which extends transversely of the push-buttons and which is coupled via rack and pinion gearing to the drum of the turret tuner. The levers of the different push-buttons have different orientations with respect to the bar so that although each lever is pivoted through the same angle, longitudinal displacement of the bar effected, and hence the setting of the turret tuner, depends upon which push-button is actuated. Upon actuation of a push-button, the bar is locked in its displaced position by means of a leaf spring, and the drum is then locked in position by means of a projection that engages in one of several notches in the drum. The mechanism has a shuttle that is coupled to a wave-band switch for switching the radio receiver between long-wave and medium-wave bands appropriate to the push-button actuated.

Claims8

Dependent claims

A push-button mechanism comprising a plurality of individually-actuable push-button means, rotatable output means, and means coupling the push-button means to the said output means to rotate the said output means to different angular positions according to which of the push-button means is actuated, said coupling means comprising a first member mounted for linear displacement, means coupling the said first member to said output means to rotate said output means to a position dependent on the extent of linear displacement of said first member, and a plurality of pivotally mounted levers associated respectively with said push-button means, each said lever being arranged for pivotal movement about an axis fixed relative to said mechanism upon actuation of its respective push-button means, the extent of said pivotal movement being dependent on the extent of actuation of said respective push-button means, and each said lever having an arm for engaging said first member so that pivotal movement of said lever is communicated to said first member to effect linear displacement thereof the extent of which is dependent upon the extent of said pivotal movement, so that actuation of said push-button means is thereby communicated to said first member through pivotal movement of the subject lever, and so that the extent of displacement of said first member is dependent upon which of the push-button means is so actuated.

A push-button mechanism comprising a plurality of push-button means, means mounting each said push-button means for linear displacement, a drum, means mounting said drum for angular displacement about its axis, a plurality of levers, each said lever having a first and second arm, means mounting each said lever for pivotal displacement with said first arm positioned for engagement with an individual one of said push-button means, a first member having a plurality of projections spaced apart at different distances from one another along its length, means mounting said first member to extend transverse to said push-button means and with each of said projections positioned for engagement with an individual one of said second arms, means mounting said first member for displacement along its length such that displacement of each said push-button means effects displacement of said first member to a different extent, means coupling said first member to said drum to effect angular rotation of said drum upon displacement of said first member, latching means actuable to restrain rotation of said drum, means coupling said latching means to said push-button means such as to release said drum for angular displacement upon displacement of an individual one of said push-button means.

Dependencies are inferred from the claim text.