US3648142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infinite speed control switching device for use with electric motors in portable tools
Assignee: Cooper Industries LLC
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Filing: 1969-11-21
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Granted: 1972-03-07
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Expires: 1989-11-21
Abstract
Abstract A trigger-operated power control switch for electric motors in portable tools, wherein control circuitry including a condenser, a fixed resistor, a silicon-controlled rectifier, a neon tube, and a potentiometer or variable resistance with which is combined switching means for isolating these parts from the source of power by opening the circuit in both powerline conductors in ''''off'''' position and for bypassing said control circuitry in full ''''on'''' position. The trigger operates the potentiometer and also controls the switching operations.
Inventors
- 👤 Lawrence G Corey
- 👤 David W Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:10
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/10; H02P25/14; H01; H01H; H01H9/00; H01H9/02; H01H9/06; H01H9/061; H01H9/52; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917; Y10S388/919; Y10S388/935; Y10S388/937
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
162 words
A trigger-operated electric power control device adapted to be mounted in the housing of an electric power tool, comprising an insulation casing having two cooperating halves, a fingeroperable trigger member extending into said casing and guided thereby for rectilinear motion, first stationary contact and terminal means carried by one of said halves, second stationary contact and terminal means carried by the other of said halves, bridging contact means carried by said trigger member and connecting and disconnecting said stationary terminal means as said trigger member is moved, means housed within said casing and operated by movement of said trigger member to vary electrical power, conductor terminal means mounted on one of said casing halves, normally open contact means operated by initial movement of said trigger member to electrically connect said power-varying means to said line terminal means, and normally open contact means closed by movemeNt of said trigger member in the same direction as said initial movement to bypass said power-varying means.
Claim 2
Dependent Claim
162 words
A trigger-operated electric power control device adapted to be mounted in the housing of an electric power tool, comprising an insulation casing having two cooperating halves, a fingeroperable trigger member extending into said casing and guided thereby for rectilinear motion, first stationary contact and terminal means carried by one of said halves, second stationary contact and terminal means carried by the other of said halves, bridging contact means carried by said trigger member and connecting and disconnecting said stationary terminal means as said trigger member is moved, means housed within said casing and operated by movement of said trigger member to vary electrical power, conductor terminal means mounted on one of said casing halves, normally open contact means operated by initial movement of said trigger member to electrically connect said power-varying means to said line terminal means, and normally open contact means closed by movemeNt of said trigger member in the same direction as said initial movement to bypass said power-varying means.
Claim 3
Dependent Claim
32 words
A device as claimed in claim 1 wherein said first and second stationary contact means include resilient members and said bridging contact means comprises a conductive member molded in said trigger member.
Claim 4
Dependent Claim
26 words
A device as claimed in claim 1 having a metal plate having a wire terminal thereon, and means electrically connecting said plate to said power-varying means.
Claim 5
Dependent Claim
26 words
A device as claimed in claim 2 having a metal plate having a wire terminal thereon, and means electrically connecting said plate to said power-varying means.
Claim 6
Dependent Claim
48 words
A device as claimed in claim 4 having supporting means of insulation on which said power-varying means is mounted at least in part, and a resilient member mounted on said supporting means, said resilient member being engaged by said conductor terminal means when said casing halves are assembled.
Claim 7
Dependent Claim
48 words
A device as claimed in claim 1 having supporting means of insulation on which said power-varying means is mounted at least in part, and a resilient member mounted on said supporting means, said resilient member being engaged by said conductor terminal means when said casing halves are assembled.
Claim 8
Dependent Claim
84 words
A device as claimed in claim 1 wherein said power varying means includes a semiconductor device and means controlled by movement of said trigger member to determine the point in an alternating current cycle when said semiconductor device becomes conductive, and a manually adjustable trimming potentiometer connected to said semiconductor conduction-determining means for adjusting after final assembly the response of said determining means for a given amount of trigger movement and to compensate for manufacturing variations in the values of the assembled power-varying means.
Claim 9
Dependent Claim
53 words
A device as claimed in claim 1, wherein each casing half has a flat side and said flat sides are parallel, and wherein said first stationary contact and terminal means is carried by one of said sides and said second stationary contact and terminal means is carried by the other of said sides.
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |