US3773156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clutch-brake and motor circuit for engine-driven implements
Assignee: Dana Inc
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Filing: 1972-07-24
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Granted: 1973-11-20
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Expires: 1992-07-24
Abstract
Abstract A control circuit for use with an electrically actuated brake and clutch mechanism through which an implement is selectively driven by an engine, the clutch and brake mechanism being characterized by having a deenergized condition in which the implement is free-wheeling and first and second energized conditions in which the implement is respectively clutched to said engine and braked to an immovable state. The control circuit includes a pair of switching devices which route energy to the clutch-and-brake mechanism from an electrical power source, one of the switching devices being in the form of a manual selector providing a choice between the first and second energized conditions of the mechanism, the other of the switching devices being controlled in accordance with the operating condition of the engine itself to (1) enable the selected one of the clutch or brake functions to occur by allowing energization of said clutchand-brake mechanism during normal operating periods of the engine, and (2) for a short time subsequent to cessation of operation of the engine to maintain such energization so that the implement is either braked or clutched to a stopped condition. Clutching of the implement to the engine is prevented during initial start-up by an interlock mechanism which allows power to be applied to the engine starter motor only when the manual selector switch for the clutch-and-brake mechanism is in the brake position.
Inventors
- 👤 S Nyquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:18
CPC Classifications
F; F16; F16D; F16D67/00; F16D67/02; F16D67/06; B; B62; B62D; B62D49/00; B62D49/06; B62D49/065
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
161 words
In combination: a prime mover for providing a mechanical output drive, a selectable control means for alternatively placing said prime mover in the on or off condition, a mechanically drivable implement, clutch means selectively engageable to couple said mechanical output drive to operate said implement, brake means selectively engageable to brake the operation of said implement, an auxiliary energy source, clutch-brake selector means for controlling the flow of energy from said energy source to engage said clutch or brake means alternatively, and time delay means between said energy source and said selector means for maintaining the energy flow to the selected one of said clutch or brake means during the normal on condition of said prime mover and for a predetermined interval after the prime mover is placed in the off condition by said control means to insure that the operating motion of said implement is either braked or clutched to a stopped condition when the prime mover is rendered inoperative.
Claim 2
Dependent Claim
161 words
In combination: a prime mover for providing a mechanical output drive, a selectable control means for alternatively placing said prime mover in the on or off condition, a mechanically drivable implement, clutch means selectively engageable to couple said mechanical output drive to operate said implement, brake means selectively engageable to brake the operation of said implement, an auxiliary energy source, clutch-brake selector means for controlling the flow of energy from said energy source to engage said clutch or brake means alternatively, and time delay means between said energy source and said selector means for maintaining the energy flow to the selected one of said clutch or brake means during the normal on condition of said prime mover and for a predetermined interval after the prime mover is placed in the off condition by said control means to insure that the operating motion of said implement is either braked or clutched to a stopped condition when the prime mover is rendered inoperative.
Claim 3
Dependent Claim
164 words
In combination: a prime mover for providing a mechanical output drive, selectable control means for alternatively placing said prime mover in the on or off condition, a mechanically drivable implement, clutch means selectively energizable to couple said mechanical output drive to operate said implement, brake means selectively energizable to brake the operation of said implement, an auxiliary energy source, time delay switch means controlled by said control means to be conductive during the normal on condition of the prime mover and non-conductive during a period delayed from but corresponding in duration to the duration of the off condition of said prime mover, a brake-clutch selector means coupled to said energy source through said switch means for energizing the selected one of said brake or clutch means during the conduction periods of said switch means, the delay of said switch means being sufficient to allow said implement to be clutched or braked to a stop after said prime mover is placed in the off condition.
Claim 4
Dependent Claim
164 words
In combination: a prime mover for providing a mechanical output drive, selectable control means for alternatively placing said prime mover in the on or off condition, a mechanically drivable implement, clutch means selectively energizable to couple said mechanical output drive to operate said implement, brake means selectively energizable to brake the operation of said implement, an auxiliary energy source, time delay switch means controlled by said control means to be conductive during the normal on condition of the prime mover and non-conductive during a period delayed from but corresponding in duration to the duration of the off condition of said prime mover, a brake-clutch selector means coupled to said energy source through said switch means for energizing the selected one of said brake or clutch means during the conduction periods of said switch means, the delay of said switch means being sufficient to allow said implement to be clutched or braked to a stop after said prime mover is placed in the off condition.
Claim 5
Dependent Claim
152 words
In combination: a prime mover for providing a mechanical output drive, selectable control means for alternatively placing said prime mover in the on or off condition, a mechanically drivable implement, clutch means seleCtively engageable to couple said mechanical output drive to operate said implement, brake means selectively engageable to brake the operation of said implement, selector means for alternatively engaging either said clutch or brake means, and selector inhibiting means controlled by said selectable control means for allowing and inhibiting engagement of said selected brake or clutch means for periods corresponding substantially to the on and off conditions respectively of said prime mover, said selector inhibiting means including a time delay device for maintaining engagement of the selected one of said brake or clutch means for a predetermined interval after said prime mover is rendered inoperative so that the operating motion of said implement terminates after operation of said prime mover ceases.
Claim 6
Dependent Claim
152 words
In combination: a prime mover for providing a mechanical output drive, selectable control means for alternatively placing said prime mover in the on or off condition, a mechanically drivable implement, clutch means seleCtively engageable to couple said mechanical output drive to operate said implement, brake means selectively engageable to brake the operation of said implement, selector means for alternatively engaging either said clutch or brake means, and selector inhibiting means controlled by said selectable control means for allowing and inhibiting engagement of said selected brake or clutch means for periods corresponding substantially to the on and off conditions respectively of said prime mover, said selector inhibiting means including a time delay device for maintaining engagement of the selected one of said brake or clutch means for a predetermined interval after said prime mover is rendered inoperative so that the operating motion of said implement terminates after operation of said prime mover ceases.
Claim 7
Dependent Claim
210 words
In combination with an engine for providing a mechanical drive, a starter motor for said engine, and an implement adapted to be driven by said engine, manual control means for alternatively placing said engine in the ON, START and OFF conditions, clutch means selectively engageable to couple said mechanical output drive to operate said implement, brake means selectively engageable to brake the operation of said implement, selector means having first and second conditions for alternatively engaging either said brake or said clutch means, starter control means operatively associated with said selector means and said manual control means for enabling operation of said starter motor by said manual control means only when said selector means is in said first condition to insure that said implement is not clutched to said engine during starting, and selector inhibit means associated with said manual control means and operative to enable and disable engagement of the selected one of said brake or clutch means for periods corresponding substantially to the ON and OFF conditions respectively of said engine, said selector inhibit means further including a time delay device for delaying the disabling of the selected one of said brake or clutch means for a predetermined interval after said engine is placed in the OFF condition.
Claim 8
Dependent Claim
210 words
In combination with an engine for providing a mechanical drive, a starter motor for said engine, and an implement adapted to be driven by said engine, manual control means for alternatively placing said engine in the ON, START and OFF conditions, clutch means selectively engageable to couple said mechanical output drive to operate said implement, brake means selectively engageable to brake the operation of said implement, selector means having first and second conditions for alternatively engaging either said brake or said clutch means, starter control means operatively associated with said selector means and said manual control means for enabling operation of said starter motor by said manual control means only when said selector means is in said first condition to insure that said implement is not clutched to said engine during starting, and selector inhibit means associated with said manual control means and operative to enable and disable engagement of the selected one of said brake or clutch means for periods corresponding substantially to the ON and OFF conditions respectively of said engine, said selector inhibit means further including a time delay device for delaying the disabling of the selected one of said brake or clutch means for a predetermined interval after said engine is placed in the OFF condition.
Claim 9
Dependent Claim
191 words
In combination with an engine for providing a mechanical drive, an implement adapted to be driven by said engine and an electrically controllable clutch-and-brake mechanism capable of achieving a deenergized condition in which the implement is free-wheeling and first and second energized conditions for respectively clutching said implement to said engine and braking the movement of said implement, a control circuit for preventing free-wheeling movement of said implement after operation of said engine has terminated including a. an electrical power source, b. first and second switching means controlling energization of said clutch-and-brake mechanism from said power source, said first switching means being selectively positionable to provide a choice between clutching or braking of said implement and said second switching means being operatively associated with said engine for enabling and disabling the energization of said brake and clutch mechanism by said power source during periods substantially corresponding to the operative and inoperative conditions, respectively, of said engine, and c. time delay means associated with said second switching means for maintaining said brake and clutch mechanism in one of said energized conditions for a predetermined delay interval after said engine is rendered inoperative.
Claim 10
Dependent Claim
191 words
In combination with an engine for providing a mechanical drive, an implement adapted to be driven by said engine and an electrically controllable clutch-and-brake mechanism capable of achieving a deenergized condition in which the implement is free-wheeling and first and second energized conditions for respectively clutching said implement to said engine and braking the movement of said implement, a control circuit for preventing free-wheeling movement of said implement after operation of said engine has terminated including a. an electrical power source, b. first and second switching means controlling energization of said clutch-and-brake mechanism from said power source, said first switching means being selectively positionable to provide a choice between clutching or braking of said implement and said second switching means being operatively associated with said engine for enabling and disabling the energization of said brake and clutch mechanism by said power source during periods substantially corresponding to the operative and inoperative conditions, respectively, of said engine, and c. time delay means associated with said second switching means for maintaining said brake and clutch mechanism in one of said energized conditions for a predetermined delay interval after said engine is rendered inoperative.
Claim 11
Dependent Claim
41 words
The combination according to claim 5 further including engine control means for placing said engine in the on or off condition, said second switching means including a normally open thermal switch in series with said power source and said brake-and-clutch mechanism.
Claim 12
Dependent Claim
49 words
The combination according to claim 6 wherein said time delay means is a resistive heating element in proximity with said thermal switch and rendered conductive whenever said engine is placed in the on cOndition and non-conductive whenever said engine is placed in the off condition by said control means.
Claim 13
Dependent Claim
68 words
The combination according to claim 5 wherein said brake and clutch mechanism includes a brake coil and a clutch coil and wherein said first switching means is a single pole-double throw switch disposed between said thermal switch and said brake and clutch coils and having a first position for allowing electrical energization of said clutch coil and a second position for allowing electrical energization of said brake coil.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |