Motor control variable speed reversing switch

A switch for interconnecting a motor, a direct current power source, and a resistor network, providing a plurality of selectable forward and reverse motor speeds responsive to displacement of a single control in a single degree of freedom, comprising:

• a case, a switch control supported by said case, and a plurality of switch outputs supported by said case,
• two electrical conductors, each having a switch input portion fixed in said case for connection to said power source, and a movable portion providing a contact,
• a source terminal fixed in said case and connected to one of said switch outputs for connection to said motor,
• an integral switch bus,
• reversal means for connecting said two conductor movable portion contacts to said source terminal and said bus in either of two polarity conditions responsive to two positions of said control,
• three parallel tracks disposed at three distinct positions, each of said tracks comprising conductive and non conductive segments, said bus providing at least one said track conductive segment, defining a powered track, each said conductive segment of each track other than said powered track being connected to a said switch output for connection to said resistor network,
• two spaced electrical bridging elements movable with respect to said tracks responsive to displacement of said control, each said bridging element providing three spaced electrically connected track contacts, said contacts of a first said bridging element being disposed for connecting at least two said conductive segments of a first pair of said tracks including a said powered track, said contacts of the other said bridging element being disposed for connecting at least two said conductive segments of a distinct pair of said tracks including a said powered track,
• said track conductive segments, said electrical bridging elements, and said track contacts being mutually spaced such that, at successive spaced positions of said control, said bridging elements successively connect distinct sets of said conductive segments, successively to provide at said switch outputs a plurality of distinct switch output conditions including a switch output OFF condition,
• said bridging elements being connected to said reversal means for common movement responsive to said control such that a first plurality of said switch output conditions is provided in said first polarity condition, a second plurality of said switch output conditions is provided in said opposite polarity condition, and said switch output OFF condition is provided in said power OFF condition.

A switch for interconnecting a motor, a direct current power source, and a resistor network, providing a plurality of selectable forward and reverse motor speeds responsive to displacement of a single control in a single degree of freedom, comprising:

• a case, a switch control supported by said case, and a plurality of switch outputs supported by said case,
• an integral switch bus connectible with said power source,
• three parallel tracks disposed at three distinct positions, each of said tracks comprising at least one conductive segment, said bus providing at least one said track conductive segment, defining a powered track, each said conductive segment of each track other than said powered track being connected to a said switch output for connection to said resistor network,
• two spaced electrical bridging elements movable with respect to said tracks responsive to displacement of said control, each said bridging element providing three spaced electrically connected track contacts, said track contacts of a first said bridging element being disposed for connecting a first pair of said tracks including a said powered track, said track contacts of the other said bridging element being disposed for connecting a distinct pair of said tracks including a said powered track,
• said track conductive segments, said electrical bridging elements, and said track contacts being mutually spaced such that, at successive spaced positions of said control, said bridging elements successively connect particular said output terminals and said bus, successively to provide at said switch outputs a plurality of distinct switch output conditions including a switch output OFF condition.