Electricity: circuit makers and breakers – Multiple circuit control – Multiple switch
Patent
1979-10-29
1981-12-01
Witkowski, S. J.
Electricity: circuit makers and breakers
Multiple circuit control
Multiple switch
200 18, 20050C, 318280, H01H 312
Patent
active
043038107
ABSTRACT:
A two speed switch (20) for electric motors permits both forward and reverse operation of the motors and eliminates the possibility of simultaneous operation of the switch in both directions. The switch (20) includes a housing (50, 80) for receiving a contact bar (140) therein. First, second and third contact terminal poles (66, 68, 70) are spaced along the longitudinal length of the contact bar (140) within the housing with the third terminal pole (70) positioned on the opposite side of the contact bar (140) from the first and second terminal poles (66, 68). The terminal poles are positioned such that when the contact bar (140) engages two of the terminal poles, it is not in engagement with the third terminal pole. First and second biasing structures (28, 30) engage the bar and normally position the bar against the first and second terminal poles. Upon actuation of the first biasing structure, the bar engages the third terminal pole (70) to close a circuit between the second terminal pole (68) and third terminal pole (70) to drive the motor in a first direction. Upon actuation of the second biasing structure (30), the contact bar (140) pivots about the first terminal pole (66) and engages the third terminal pole (70) to close a circuit between the first terminal pole (66) and third terminal pole (70) to drive the motor in a second direction. A switch (180) for operating the first and second speeds of the motor is positioned on the opposite side of the third terminal pole (70) from the contact bar (140). The switch (180) is operable by overtravel of the first or second biasing structure to close the appropriate circuits to operate the motor in either a first or second speed only when the circuit for operating the motor in either the forward or reverse direction is likewise closed.
REFERENCES:
patent: 2639337 (1953-05-01), Framhein
Ginsburg Morris
Witkowski S. J.
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