Patent US3616864A successfully refreshed from Google Patents.
US3616864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torque-controlled motor shutoff for power tool
Assignee: Gardner Denver Inc
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Filing: 1969-11-28
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Granted: 1971-11-02
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Expires: 1989-11-28
Abstract
Abstract A torque-responsive shutoff mechanism for a torque-producing power tool having a valve operable to shut off the flow of motive pressure air to the tool motor. The shutoff valve includes an elongated actuating rod which is releasably held by a plurality of radially spaced balls which are operable to frictionally grip the rod diameter. The gripping ball members are forced into engagement with the rod by a driven member of a torque-sensing device interposed in the drive train of the tool. The driving and driven members of the torque-sensing device include interengaging sloped surfaces which force the members to move axially relative to each other upon reaching a predetermined resistance to rotation. The radially spaced balls contained within a conical recess in the driven member are relieved of their engaging force on the valve-actuating rod upon axial movement of the driven member whereby the shutoff valve is biased to the closed position. The driving and driven members of the torque-sensing device are biased into engagement by a variably compressible coil spring.
Inventors
- 👤 Clarence A Sorensen
- 👤 Edwin J Deremo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:19
CPC Classifications
F; F16; F16D; F16D43/00; F16D43/02; F16D43/20; B; B25; B25B; B25B23/00; B25B23/14; B25B23/145
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
205 words
In a torque tool: a motor operable to rotatively drive a spindle; a power supply; shutoff means including an elongated actuating rod operable to provide for said power supply to be connected to said motor and for said power supply to said motor to be shut off, and the improvement comprising: torque-sensing rotation transmitting means interposed between said motor and said spindle including driving and driven members having complementary sloped surfaces providing for engagement therebetween to transmit torque from said motor to said spindle, said driven member being operable to move axially with respect to said driving member upon sensing a predetermined torque produced by said motor, and said driven member including a conical recess forming an inclined surface substantially circumsurrounding and engaged with a plurality of gripping members and forcing said gripping members into engagement with said rod, said gripping members being responsive to the axial movement of said driven member to release said rod to provide for the shutoff of said power supply to said motor, and adjustable biasing means operable to yieldably bias said driving and driven members into engagement and to force said driven member to forcibly engage said gripping members to hold said gripping members in engagement with said rod.
Claim 2
Dependent Claim
205 words
In a torque tool: a motor operable to rotatively drive a spindle; a power supply; shutoff means including an elongated actuating rod operable to provide for said power supply to be connected to said motor and for said power supply to said motor to be shut off, and the improvement comprising: torque-sensing rotation transmitting means interposed between said motor and said spindle including driving and driven members having complementary sloped surfaces providing for engagement therebetween to transmit torque from said motor to said spindle, said driven member being operable to move axially with respect to said driving member upon sensing a predetermined torque produced by said motor, and said driven member including a conical recess forming an inclined surface substantially circumsurrounding and engaged with a plurality of gripping members and forcing said gripping members into engagement with said rod, said gripping members being responsive to the axial movement of said driven member to release said rod to provide for the shutoff of said power supply to said motor, and adjustable biasing means operable to yieldably bias said driving and driven members into engagement and to force said driven member to forcibly engage said gripping members to hold said gripping members in engagement with said rod.
Claim 3
Dependent Claim
24 words
The invention set forth in claim 1 wherein: said gripping members comprise a plurality of balls radially spaced with respect to said actuating rod.
Claim 4
Dependent Claim
183 words
In a torque tool: a motor operable to rotatively drive a spindle; a power supply; shutoff means including an elongated actuating member movable to provide for said power supply tO be connected to said motor and for said power to said motor to be shut off, and the improvement comprising: torque-sensing rotation transmitting means interposed between said motor and said spindle including driving and driven members operable to move axially relative to each other upon sensing a predetermined torque produced by said motor, a plurality of members spaced around and operable to be in frictional gripping engagement with said actuating member for moving said actuating member, surface means on one of said driving and driven members circumsurrounding and engageable with said plurality of members to hold said plurality of members in frictional gripping engagement with said actuating member and in response to the relative axial movement of said driving and driven members said plurality of members are operable to release said frictional gripping engagement with said actuating members to allow said actuating member to move to shut off said power to said motor.
Claim 5
Dependent Claim
183 words
In a torque tool: a motor operable to rotatively drive a spindle; a power supply; shutoff means including an elongated actuating member movable to provide for said power supply tO be connected to said motor and for said power to said motor to be shut off, and the improvement comprising: torque-sensing rotation transmitting means interposed between said motor and said spindle including driving and driven members operable to move axially relative to each other upon sensing a predetermined torque produced by said motor, a plurality of members spaced around and operable to be in frictional gripping engagement with said actuating member for moving said actuating member, surface means on one of said driving and driven members circumsurrounding and engageable with said plurality of members to hold said plurality of members in frictional gripping engagement with said actuating member and in response to the relative axial movement of said driving and driven members said plurality of members are operable to release said frictional gripping engagement with said actuating members to allow said actuating member to move to shut off said power to said motor.
Claim 6
Dependent Claim
84 words
The invention set forth in claim 3 wherein: said driving and driven members of said torque-sensing means include complementary sloping surfaces operable to provide for engagement between said driving and driven members to transmit torque from said motor to said spindle, and said driven member includes a substantially conical recess forming said surface means engageable with said plurality of members and said driven member operable to move axially with respect to said driving member in response to a predetermined torque produced by said motor.
Claim 7
Dependent Claim
26 words
The invention set forth in claim 4 wherein: said torque-sensing means includes adjustable biasing means operable to yieldably bias said driving and driven members into engagement.
References Cited (Backward Citations)
US3242996A
Cited
US3205992A
Cited
US3262536A
Cited
US3275116A
Cited
US3477521A
Cited
US3512591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |