Patent US3722641A successfully refreshed from Google Patents.
US3722641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
No back actuator system
Assignee: RTX Corp
•
Filing: 1971-09-16
•
Granted: 1973-03-27
•
Expires: 1991-09-16
Abstract
Abstract A bidirectional no-back such as a sprag clutch or no-back spring for locking the rotary member of a screw type actuator for restraining its movement in either direction is loaded out of engagement to permit movement of the actuator by a pair of hydraulic motors cooperating therewith such that when one drives the other is driven.
Inventors
- 👤 E Kusiak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:19
CPC Classifications
F; F16; F16H; F16H25/00; F16H25/18; F16H25/20; F16H25/22; F16H25/2204; F16B; F16B1/00; F16B1/02; F16B1/04; F16D; F16D41/00; F16D41/20; F16D41/206; F16H25/24; F16H25/2454; F16H2025/2463
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
114 words
A system for disengaging a bidirectional no-back brake or clutch as a sprag clutch or no-back spring for an actuator having a rotary nut and a nonrotary screw with means for rotating the nut to telescope tHe screw comprising a pair of combined hydraulic motor-pump units, means connecting said pair of combined motor-pump units for rotating said nut in a clockwise and counterclockwise direction, and control means for alternately actuating said pair of motor-pump units such that when one is the motor the other is a pump and means operatively connecting said pair of motor-pump units and said bidirectional brake or clutch to disengage the same so as to permit rotation of said nut.
Claim 2
Independent Claim
114 words
A system for disengaging a bidirectional no-back brake or clutch as a sprag clutch or no-back spring for an actuator having a rotary nut and a nonrotary screw with means for rotating the nut to telescope tHe screw comprising a pair of combined hydraulic motor-pump units, means connecting said pair of combined motor-pump units for rotating said nut in a clockwise and counterclockwise direction, and control means for alternately actuating said pair of motor-pump units such that when one is the motor the other is a pump and means operatively connecting said pair of motor-pump units and said bidirectional brake or clutch to disengage the same so as to permit rotation of said nut.
Claim 3
Dependent Claim
25 words
A system as claimed in claim 1 including feedback means interconnecting said actuator and said control means for holding said actuator in a predetermined position.
Claim 4
Dependent Claim
33 words
A system as claimed in claim 2 including an input receiving member operatively connected to said control means to position said actuator a function of the input imposed on said input receiving member.
Claim 5
Dependent Claim
37 words
A system as claimed in claim 2 including a source of hydraulic pressure, said control means alternately interconnecting said source and said motor-pump combination units to alternately rotate said rotary nut in a clockwise and counterclockwise direction.
Claim 6
Independent Claim
93 words
A system for braking a rotary member of an actuator including braking means for normally braking said rotary member so as to prevent its rotation, means driving said rotary member including a pair of motor-pump combined units that alternately drive said rotary member in either a clockwise or counterclockwise direction such that when one of said pair drives the other of said pair pumps, and means interconnecting said pair of motor-pump combined units and said braking means to impose a continuous load on said braking means to render it in its nonbraking mode.
Claim 7
Independent Claim
93 words
A system for braking a rotary member of an actuator including braking means for normally braking said rotary member so as to prevent its rotation, means driving said rotary member including a pair of motor-pump combined units that alternately drive said rotary member in either a clockwise or counterclockwise direction such that when one of said pair drives the other of said pair pumps, and means interconnecting said pair of motor-pump combined units and said braking means to impose a continuous load on said braking means to render it in its nonbraking mode.
Claim 8
Independent Claim
139 words
A system for braking a rotary member of an actuator including braking means for normally braking said rotary member so as to prevent its rotation, means driving said rotary member including a first motor-pump combined unit that drives said rotary member in one direction and a second motor-pump combined unit driving said rotary member in an opposite direction such that when said first motor-pump combined unit drives the second motor-pump unit pumps, means interconnecting said first and second motor-pump combined units and said braking means to impose a continuous load on said braking means to render it in its nonbraking mode, and means for admitting hydraulic fluid to said first and second motor-pump combined units to keep both in a hydraulically loaded condition, whereby a loss of hydraulic fluid causes an unloaded condition so that the brakes automatically engage.
Claim 9
Independent Claim
139 words
A system for braking a rotary member of an actuator including braking means for normally braking said rotary member so as to prevent its rotation, means driving said rotary member including a first motor-pump combined unit that drives said rotary member in one direction and a second motor-pump combined unit driving said rotary member in an opposite direction such that when said first motor-pump combined unit drives the second motor-pump unit pumps, means interconnecting said first and second motor-pump combined units and said braking means to impose a continuous load on said braking means to render it in its nonbraking mode, and means for admitting hydraulic fluid to said first and second motor-pump combined units to keep both in a hydraulically loaded condition, whereby a loss of hydraulic fluid causes an unloaded condition so that the brakes automatically engage.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |