Abstract An electronic switch for variably controlling the speed of an electric motor, comprising a stationary member, a trigger member, clip means for securing said trigger member slidably relative to said stationary member, a pair of electric cords extending from the inside of said trigger member for connecting said electronic switch in circuit with an electric motor and power source, switching means and a solid-state semiconductor control device supported within said trigger member; characterized in that, said switching means comprising two sets of contacts, with one set including three electrically conductive contacts, another set including one electrically conductive contact and a resistor for providing various resistance values, disposed on said trigger member in spaced relation to each other, and two electrically conductive bridging contacts mounted on said stationary member in isolated relation to each other for contacting with the respective set of contacts; while said trigger member being manually actuated with respect to said stationary member, the first bridging contact is movable among a non-bridging position wherein said first bridging contact engages with the first contact of the said three contacts, a first bridging position wherein said first bridging contact engages with the first and the second contacts of the said three contacts, and a second bridging position wherein said first bridging contact engages with the first and the third contacts of the said three contacts; simultaneously, the second bridging contact is movable with one end thereof slidably engaging with the contact of the associated set and the other end thereof slidably engaging with said resistor for providing various resistance values in a manner to control the application of variable magnitudes of electrical energy, for selectively varying the speed of said electric motor.
An electronic switch for variably controlling the speed of an electric motor, comprising a stationary member, a trigger member, clip means for securing said trigger member slidably relative to said stationary member, a pair of electric cords extending from the inside of said trigger member for connecting said electronic switch in circuit with an electric motor and power source, switching means and a solid-state semiconductor control device supported within said trigger member; characterized in that, said switching means comprising two sets of contacts, with one set including three electrically conductive contacts, another set including one electrically conductive contact and a resistor for providing various resistance values, disposed on said trigger member in spaced relation to each other, and two electrically conductive bridging contacts mounted on said stationary member in isolated relation to each other for contacting with respective set of contacts; while said trigger being manually actuated with respect to said stationary member, the first bridging contact is movable among a non-bridging position wherein said first bridging contact engages with the first contact of the said three contacts, a first bridging position where said first bridging contact engages with the first and the second contacts of the said three contacts, and a second bridging position wherein said first bridging contact engages with the first and the third contacts of the said three contacts; simultaneously, the second bridging contact is movable with one end thereof slidably engaging with the contact of associated set and the other end thereof slidably engaging with said resistor for providing various resistance values in a manner to control the application of variable magnitude of electrical energy, for selectively varying the speed of said electric motor.
Claim 2
Dependent Claim
279 words
An electronic switch for variably controlling the speed of an electric motor, comprising a stationary member, a trigger member, clip means for securing said trigger member slidably relative to said stationary member, a pair of electric cords extending from the inside of said trigger member for connecting said electronic switch in circuit with an electric motor and power source, switching means and a solid-state semiconductor control device supported within said trigger member; characterized in that, said switching means comprising two sets of contacts, with one set including three electrically conductive contacts, another set including one electrically conductive contact and a resistor for providing various resistance values, disposed on said trigger member in spaced relation to each other, and two electrically conductive bridging contacts mounted on said stationary member in isolated relation to each other for contacting with respective set of contacts; while said trigger being manually actuated with respect to said stationary member, the first bridging contact is movable among a non-bridging position wherein said first bridging contact engages with the first contact of the said three contacts, a first bridging position where said first bridging contact engages with the first and the second contacts of the said three contacts, and a second bridging position wherein said first bridging contact engages with the first and the third contacts of the said three contacts; simultaneously, the second bridging contact is movable with one end thereof slidably engaging with the contact of associated set and the other end thereof slidably engaging with said resistor for providing various resistance values in a manner to control the application of variable magnitude of electrical energy, for selectively varying the speed of said electric motor.