US3660742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trigger operated speed control assembly for electrical motors
Assignee: Skil Corp
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Filing: 1970-06-24
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Granted: 1972-05-02
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Expires: 1990-06-24
Abstract
Abstract A trigger operated switch includes three contact strips and a bypass contact button. The trigger carries three slides for respective sliding engagement with such strips. Two of the strips are adapted for connection with a speed control circuit, one strip cooperating with one slide to define a variable resistor of such circuit. When the trigger is fully depressed, one of the slides is in engagement with the contact button for bypassing the speed control circuit.
Inventors
- 👤 Alex F Gawron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:53
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/292; H02P7/293; H01; H01H; H01H9/00; H01H9/02; H01H9/06; H01H9/061; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917; Y10S388/935; Y10S388/937
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
239 words
A trigger operated control unit for use in controlling the speed of an electric motor in a hand manipulatable tool, said unit comprising, a base mounting first, second and third contact strips in spaced, parallel and insulated relation, a contact mounted on said base adjacent one end of said first strip and in insulated relation with the same, a conductive slider mounted for reciprocal movement axially of said strips, a trigger associated with said slider for reciprocating the same, said slider having first, second and third slides adapted for respective sliding engagement with said first, second and third strips for placing each strip in electrical communication with the other strips, said slides being arranged with respect to said strips so that as said slider is moved by said trigger in a direction toward said contact said slides slidably engage respective strips simultaneously until said first slide passes beyond said one end of said first strip whereby upon continued movement of said slider in said direction said second slide remains in sliding engagement with said second strip and said first slide comes into engagement with said contact, said third strip third strip having a resistance value and forming, with said third slide, a variable resistor, a speed control circuit including a thyristor, two of said contact strips being adapted for connection with said speed control circuit, said contact being adapted for connection with a bypass line for shunting said circuit.
Claim 2
Dependent Claim
239 words
A trigger operated control unit for use in controlling the speed of an electric motor in a hand manipulatable tool, said unit comprising, a base mounting first, second and third contact strips in spaced, parallel and insulated relation, a contact mounted on said base adjacent one end of said first strip and in insulated relation with the same, a conductive slider mounted for reciprocal movement axially of said strips, a trigger associated with said slider for reciprocating the same, said slider having first, second and third slides adapted for respective sliding engagement with said first, second and third strips for placing each strip in electrical communication with the other strips, said slides being arranged with respect to said strips so that as said slider is moved by said trigger in a direction toward said contact said slides slidably engage respective strips simultaneously until said first slide passes beyond said one end of said first strip whereby upon continued movement of said slider in said direction said second slide remains in sliding engagement with said second strip and said first slide comes into engagement with said contact, said third strip third strip having a resistance value and forming, with said third slide, a variable resistor, a speed control circuit including a thyristor, two of said contact strips being adapted for connection with said speed control circuit, said contact being adapted for connection with a bypass line for shunting said circuit.
Claim 3
Dependent Claim
230 words
A trigger operated speed control assembly for an electric motor comprising, a switch housing including a base mounting first, second and third contact strips in parallel, spaced and insulated relation, a contact mounted on said base in insulated relation with the latter and in adjacent relation with one end of said first strip, a trigger mounted in said housing for reciprocating movement axially of said strip between first and second positions, a conductive slider carried by said trigger, which slider includes first, second and third slides adapted for respective sliding engagement with said first, second and third strips, said slides being arranged so thaT when said trigger is in said first position at least one of said slides is separated from the associated strip, so that when said trigger is in said second position said first and second slides are in respective contact with said contact and said second strip, and so that during movement of said trigger between said first an second positions said slides slidably engage respective strips simultaneously, said third strip having a resistance value and forming, with said third slide, a variable resistor, a speed control circuit including a thyristor, two of said contact strips being adapted for connection with said speed control circuit, said contact being adapted for communication with a bypass line for shunting said circuit when said trigger is in said second position.
Claim 4
Dependent Claim
230 words
A trigger operated speed control assembly for an electric motor comprising, a switch housing including a base mounting first, second and third contact strips in parallel, spaced and insulated relation, a contact mounted on said base in insulated relation with the latter and in adjacent relation with one end of said first strip, a trigger mounted in said housing for reciprocating movement axially of said strip between first and second positions, a conductive slider carried by said trigger, which slider includes first, second and third slides adapted for respective sliding engagement with said first, second and third strips, said slides being arranged so thaT when said trigger is in said first position at least one of said slides is separated from the associated strip, so that when said trigger is in said second position said first and second slides are in respective contact with said contact and said second strip, and so that during movement of said trigger between said first an second positions said slides slidably engage respective strips simultaneously, said third strip having a resistance value and forming, with said third slide, a variable resistor, a speed control circuit including a thyristor, two of said contact strips being adapted for connection with said speed control circuit, said contact being adapted for communication with a bypass line for shunting said circuit when said trigger is in said second position.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |