Device for mounting a plurality of transistors

Details Device for mounting a plurality of transistors Device for mounting a plurality of transistors

1994-03-21

1995-01-17

Thompson, Gregory D.

Electricity: electrical systems and devices

Housing or mounting assemblies with diverse electrical...

For electronic systems and devices

165 803, 165185, 174 163, 257719, 361710, 361713, H05K 720

Patent

active

053830920

ABSTRACT:
Disclosed is an arrangement for connecting a plurality of transistors to a heat sink surrounding one end of a control motor for a mailing machine. The motor is a conventional bi-directional stepping motor which controls various operational functions of the mailing machine. The direction, speed and continuity of the rotation of the motor rotor are controlled by a plurality of transistors which receive appropriate signals from a microprocessor. The transistors generate a substantial amount of heat during operation of the motor and are mounted on a heat sink connected to the motor in order to dissipate this heat. In the arrangement disclosed, there are two sets of three transistors each, and each set is mounted on the heat sink by a single screw, washer, insulator and hold-down spring, rather than by separate screws, lock washers, flat washers, insulators and nuts for each of the six transistors, thereby greatly reducing the number of parts required to assemble the transistors to the motor and the labor time required to do so.

REFERENCES:
patent: 4288839 (1981-09-01), Prager et al.
patent: 4557225 (1985-12-01), Sagues et al.
patent: 4853828 (1989-08-01), Penn
patent: 5134545 (1992-07-01), Smith

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