Abstract: An electric switch or commutator actuated by bimetals for one or several temperatures of response comprises a cap support for one or several bimetallic disks of a well known type which cooperates with a base made of one piece, the base comprising a substantially cylindrical part disposed to join with the cap support for mounting the bimetallic disks and having rivets extending through the cylindrical base part into an integral part of the base which mounts fixed and movable contacts of the switch and which is disposed to support also the connecting terminals and a covering and protecting element with snap-action insertion.

Abstract: A keyboard unit is shown having a substrate in which portions of the substrate are physically displaced to provide a cavity, an embossment and a plurality of protuberances for each switching station. The embossment, in registry with a button contact area, projects upwardly from the floor of the cavity a selected distance with a discontinuance annulus contact area extending around its respective cavity in generally the same plane as that in which the top surface of the substrate lies. The cavity includes a channel shaped portion extending through the discontinued portion of the discontinuous annulus. The protuberances project upwardly from the general plane of the substrate's top surface and serve to laterally locate a snap-acting disc over the contact areas. The disc may be selectively coated with highly electrically conductive material to optimize electrical switching. A piece of flexible, electrically insulative sheet may be placed over the unit to seal it from the environment.

Abstract: A method of assembling a motor starting relay whereby a series of open-ended cases are advanced in sequence to an assembly station, a pair of contacts which are assembled by providing two lines of terminals and two lines of springs and having each head spring and head terminal become an integral unit, are placed into the case and after a resistor wafer is placed between the parallel placed contacts, lids are placed on each housing.

Abstract: A motor starting relay particularly adapted for use in starting single phase asynchronous motors comprises a resistor element of positive temperature coefficient of resistivity which is compactly arranged within a housing and engaged by electrical contact and terminals means of particular structure and of a material of relatively high thermal resistance in a novel way such that power dissipation or loss by the resistor is reduced to a very low level after it has performed its motor starting function but so that, at the same time, the resistor is adapted to cool more rapidly after interruption of motor operation to permit prompt motor restarting.