Texas Instruments Corporation

Pietro De Filippis

Amedeo Salvatore

Giuseppe Notaro

Ciro Calenda

Luigi Trama

Luigi Abbondandolo

Henry J Boulanger

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 discontinuous 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.

A method for making low profile microswitches, particularly useful for

A thermostat equipped with a bimetallic element sensitive to a given temperature comprises a monolithic base open at one end in which two terminals connectable to an electric circuit are inserted and precisely located, each having one end bent at a right angle and each carrying a stationary contact, an element carrying movable contacts for connecting the stationary contacts with one another, a spring housed in a seat on said base biasing the movable contact element to engage the stationary contacts, a sliding element for moving and guiding said movable contact-carrying element, a bimetallic element suitably spaced from the said sliding element for initiating movement of the sliding element in response to temperature change, and a lid which fastens the said bimetallic element to the said base with said spacing from the sliding element.

Thermostat

A delayed-action thermal relay, particularly for starting single-phase induction motors, comprises a case of insulating material, a first, a second, and a third terminal within the case, an actuator unit consisting of a heating element of a material with positive temperature coefficient and of a bimetal member, and first and second contacts that are normally closed carried by the bimetal and by the third terminal respectively, said actuator unit being forcibly and adjustably inserted between the first and second terminals.

Delayed-action thermal relay

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.

Electric switches actuated by bimetals for one or several temperatures

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.

Low profile microswitches, particularly useful for the composition of

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.

Method of assembling a motor starting relay

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.

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Naples, Italy

Pietro De Filippis