Patent US3855852A successfully refreshed from Google Patents.
US3855852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling the characteristics of magnetically operated friction type power absorption devices
Assignee: Clayton Manufacturing Co
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Filing: 1970-09-23
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Granted: 1974-12-24
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Expires: 1990-09-23
Abstract
Abstract Apparatus for controlling a rotary power absorber while absorbing driving torque produced by a prime mover. The power absorber includes a housing containing magnetically operated brake elements that are actuatable electrically to provide retarding force. The control means for the brake applying means includes a tachometer generator driven at a speed proportional to the speed of rotation of the prime mover so that electrical current is produced in direct proportion to the speed of the prime mover. A rheostat is connected in the circuit between the generator and the braking elements for controlling the maximum retarding force at various engine speeds. In one form of the invention, a signal amplifier is connected in the circuit between the brake elements and the generator and rheostat. The retarding force is increased and decreased at a rate faster than the changes in speed and torque of the prime mover to avoid stalling of the prime mover as frequently occurs when a constant load is sought to be applied to the prime mover and there is a momentary failure in power of the prime mover.
Inventors
- 👤 E Cline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:20
CPC Classifications
G; G01; G01L; G01L3/00; G01L3/16; G01L3/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
221 words
A friction type power absorber for use in analyzing the performance of a prime mover, comprising: a brake shaft for receiving driving torque from a member driven by a prime mover; power absorption means including rotor means connected with said brake shaft to receive driving torque from said brake shaft, stator means operatively disposed relative to said rotor means; friction brake means carried by one of either said rotor or stator means and movable into and out of frictional engagement with the other; electric actuator means operable to apply force for moving said friction brake means into said frictional engagement to thereby apply retarding force to said rotor in opposition to driving torque applied thereto by said brake shaft, the value of said retarding force varying with the force exerted by said actuator means; and control means including means to generate an electric signal to actuate an element of an electrical system for controlling said electric actuator means in accordance with the speed of rotation of said brake shaft so that the force exerted on said friction brake means by said actuator means varies as a function of said rotational speed and so that said retarding force is substantially zero at zero speed of said brake shaft and increases and decreases in value at a rate faster than said driving torque.
Claim 2
Dependent Claim
221 words
A friction type power absorber for use in analyzing the performance of a prime mover, comprising: a brake shaft for receiving driving torque from a member driven by a prime mover; power absorption means including rotor means connected with said brake shaft to receive driving torque from said brake shaft, stator means operatively disposed relative to said rotor means; friction brake means carried by one of either said rotor or stator means and movable into and out of frictional engagement with the other; electric actuator means operable to apply force for moving said friction brake means into said frictional engagement to thereby apply retarding force to said rotor in opposition to driving torque applied thereto by said brake shaft, the value of said retarding force varying with the force exerted by said actuator means; and control means including means to generate an electric signal to actuate an element of an electrical system for controlling said electric actuator means in accordance with the speed of rotation of said brake shaft so that the force exerted on said friction brake means by said actuator means varies as a function of said rotational speed and so that said retarding force is substantially zero at zero speed of said brake shaft and increases and decreases in value at a rate faster than said driving torque.
Claim 3
Dependent Claim
201 words
A friction type power absorber for use in analyzing the performance of a prime mover, comprising: a brake shaft for receiving driving torque from a member driven by a prime mover; power absorption means including drum-like rotor means connected with said brake shaft to receive driving torque from said brake shaft, stator means operatively disposed within said rotor means; electromagnetically operated rotation retarding brake means positioned between said rotor and stator means; electrical actuator means operable to energize said brake means to thereby apply retarding force to said rotor in opposition to driving torque applied thereto by said brake shaft, the value of said retarding force varying with current supplied through said actuator means; and control means including means to generate an electrical signal to actuate an element of an electrical system for controlling said electrical actuaTor means in accordance with the speed of rotation of said brake shaft so that the energizing force exerted on said brake means by said actuator means varies as a function of said rotational speed and so that said retarding force is substantially zero at zero speed of said brake shaft and increases and decreases in value at a rate faster than said driving torque.
Claim 4
Dependent Claim
201 words
A friction type power absorber for use in analyzing the performance of a prime mover, comprising: a brake shaft for receiving driving torque from a member driven by a prime mover; power absorption means including drum-like rotor means connected with said brake shaft to receive driving torque from said brake shaft, stator means operatively disposed within said rotor means; electromagnetically operated rotation retarding brake means positioned between said rotor and stator means; electrical actuator means operable to energize said brake means to thereby apply retarding force to said rotor in opposition to driving torque applied thereto by said brake shaft, the value of said retarding force varying with current supplied through said actuator means; and control means including means to generate an electrical signal to actuate an element of an electrical system for controlling said electrical actuaTor means in accordance with the speed of rotation of said brake shaft so that the energizing force exerted on said brake means by said actuator means varies as a function of said rotational speed and so that said retarding force is substantially zero at zero speed of said brake shaft and increases and decreases in value at a rate faster than said driving torque.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |