US 4,088,852 A · Motor speed control switch assembly

Abstract

A switch for speed control of an electric motor driven vehicle employs a combination of resistance switching, field weakening and voltage switching. A mechanical switch assembly has a speed switch and a voltage switch that are interconnected so that the voltage switch provides 36 volts when the speed switch is in neutral and fifth speed position and provides 18 volts when the speed switch is in first through fourth speed positions. The speed switch has an operator controlled rotor arm that successively engages a neutral contact and five driving speed contacts so that varying resistance is inserted in circuit with the motor armature in the first two speed positions and no external resistance is employed in the third and fifth speed positions. The motor field comprises pairs of first and second oppositely disposed series wound coils with the pairs of coils all connected and energized in series in all but the fourth speed position. In the fourth speed position one pair of oppositely disposed field coils is completely disconnected while the other pair is energized to provide a higher speed at the lower voltage and a better transition between low and high voltage driving speeds.

Claims24

Dependent claims

A motor speed control switch mechanism comprising:

a support,
a speed switch assembly mounted on the support,
a voltage switch assembly mounted on the support,
connecting means between the speed switch assembly and the voltage switch assembly for actuating the voltage switch assembly in response to operation of the speed switch assembly through selected portions of its travel while permitting operation of the speed switch assembly without operation of the voltage switch assembly through other portions of the speed switch assembly travel, said connecting means comprising a cam and a cam follower connected to respective ones of said switch assemblies, said cam (comprises) comprising a cam plate having an arcuate slot formed therein and (wherein) said cam follower (is) being mounted to ride within said slot during motion of said speed switch assembly.

1 more element

A speed control switch mechanism for an electric motor comprising:

a mounting board,
a plurality of speed switch fixed contacts mounted on the mounting board and including at least one low speed contact, an intermediate speed contact and a high speed contact,
a speed switch rotor pivoted to the mounting board and spaced from the fixed contacts, said speed switch rotor having a movable contact fixed thereto for sequential engagement with each of said speed switch fixed contacts as the rotor is pivoted from an off position wherein the movable contact engages none of the fixed contacts, through low and intermediate speed positions to a high speed position thereof,
a cam plate fixed to the speed switch rotor, said cam plate having an arcuate cam slot formed therein having first and second end portions and an intermediate portion, means for connecting an accelerator member to said rotor for moving the rotor through and between said positions thereof,
first and second voltage switch fixed contacts fixed to the mounting board,
a voltage switch rotor on the mounting board and spaced therefrom, said voltage switch rotor having a pair of movable contacts extending therefrom toward the mounting board for selective engagement with said voltage switch fixed contacts,
said voltage switch rotor being pivotally mounted to the mounting board for movement between a low voltage position thereof in which there is one state of engagement between the fixed and movable contacts of the voltage switch and a high voltage position thereof in which there is a second state of engagement between the fixed and movable contacts of the voltage switch,
a cam follower fixed to the voltage switch rotor and extending therefrom into camming engagement within the cam slot of the cam plate, said first end portion of the cam slot having a first cam surface engaging said cam follower to move the voltage switch rotor from said high voltage position thereof to said low voltage position thereof as said speed switch rotor moves from said off position to a first low speed position, said first end portion of the cam slot including a second cam surface engaging said cam follower for driving said voltage switch rotor from said low voltage position thereof to said high voltage position thereof as said speed switch rotor moves from said low speed position to said off position,
said second end portion of said cam slot including a third surface engaging said cam follower for driving said voltage switch rotor from said low voltage position to said high voltage position thereof as said speed switch rotor moves from said intermediate speed position to said high speed position, said second end portion of said cam slot including a fourth cam surface engaging said cam follower for moving said voltage switch rotor from said high voltage position thereof to said low voltage position thereof as said speed switch rotor moves from said high speed position to said intermediate position thereof.

6 more elements

A speed control switch mechanism for an electric motor comprising:

a mounting board,
a plurality of speed switch fixed contacts mounted on the mounting board and including at least one low speed contact, an intermediate speed contact and a high speed contact,
a speed switch rotor pivoted to the mounting board and spaced from the fixed contacts, said speed switch rotor having a movable contact fixed thereto for sequential engagement with each of said speed switch fixed contacts as the rotor is pivoted from an off position wherein the movable contact engages none of the fixed contacts, through low and intermediate speed positions to a high speed position thereof,
first and second voltage switch fixed contacts fixed to the mounting board,
a voltage switch rotor on the mounting board and spaced therefrom, said voltage switch rotor having a pair of movable contacts extending therefrom toward the mounting board for selective engagement with said voltage switch fixed contacts,
said voltage switch rotor being pivotally mounted to the mounting board for movement between a low voltage position thereof in which there is one state of engagement between the fixed and movable contacts of the voltage switch and a high voltage position thereof in which there is a second state of engagement between the fixed and movable contacts of the voltage switch,
voltage switch operating means responsive to said speed switch rotor for driving said voltage switch rotor from said low voltage position to said high voltage position thereof as said speed switch rotor moves from said intermediate speed position to said high speed position, and for driving said voltage switch rotor from said high voltage position thereof to said low voltage position thereof as said speed switch rotor moves from said high speed position to said intermediate position thereof.

4 more elements

Dependencies are inferred from the claim text.

Motor speed control switch assembly

Life of this patent

Motor speed control switch assembly

Life of this patent

Abstract

Claims24