US3765260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Load limiting mechanism
Assignee: United States Department of the Army
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Filing: 1972-09-01
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Granted: 1973-10-16
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Expires: 1992-09-01
Abstract
Abstract A load limiting mechanism for an aircraft canopy actuator in which the gear transmission has an automatic decoupling arrangement to eliminate excessive force on the actuator when a predetermined load imposing closed canopy position has been reached. The power transmission includes a one-way drive connection for opening the canopy, and a second canopy closing drive connection which is disengaged or disconnected when the canopy has reached its closed position.
Inventors
- 👤 A Lucas
- 👤 F Pisano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:21
CPC Classifications
F; F16; F16H; F16H35/00; F16H35/10; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18568; Y10T74/18576; Y10T74/18696; Y10T74/19; Y10T74/19614; Y10T74/19642; Y10T74/19698; Y10T74/19828
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
210 words
A load limiting mechanism for a canopy actuating arrangement, comprising a reversible electric motor having a driving shaft, a bevel pinion secured to said motor shaft, a transmission shaft carrying a bevel gear driven by said pinion, an annular retainer, a worm gear longitudinally keyed thereto and having a transversely slotted end wall, and a bearing assembly having an inner race housing at least one end of a compression spring, said retainer being secured to said bevel gear and having a one-way drive connection with said transmission shaft to rotate same in a first direction, said retainer having spring biased detent means for engaging said slotted end walls to rotate said worm gear and transmission shaft in a second direction, a self locking nut threadedly mounted on said transmission shaft and having a transverse surface for abutting said spring, a worm wheel mounted on a canopy actuating shaft and drivingly connected with said worm gear, so constructed and arranged that when said worm gear, rotating in said second direction, drives said worm wheel beyond a predetermined load imposing closed canopy position, said worm gear will advance along said transmission shaft to compress said spring and disengage the drive connection between said detent means and said worm gear slotted end wall.
Claim 2
Dependent Claim
210 words
A load limiting mechanism for a canopy actuating arrangement, comprising a reversible electric motor having a driving shaft, a bevel pinion secured to said motor shaft, a transmission shaft carrying a bevel gear driven by said pinion, an annular retainer, a worm gear longitudinally keyed thereto and having a transversely slotted end wall, and a bearing assembly having an inner race housing at least one end of a compression spring, said retainer being secured to said bevel gear and having a one-way drive connection with said transmission shaft to rotate same in a first direction, said retainer having spring biased detent means for engaging said slotted end walls to rotate said worm gear and transmission shaft in a second direction, a self locking nut threadedly mounted on said transmission shaft and having a transverse surface for abutting said spring, a worm wheel mounted on a canopy actuating shaft and drivingly connected with said worm gear, so constructed and arranged that when said worm gear, rotating in said second direction, drives said worm wheel beyond a predetermined load imposing closed canopy position, said worm gear will advance along said transmission shaft to compress said spring and disengage the drive connection between said detent means and said worm gear slotted end wall.
Claim 3
Dependent Claim
68 words
The structure in accordance with claim 1 wherein said transmission shaft has a radially outwardly extending shoulder positioned intermediate end surface portions of said retainer and worm gear, said compression spring urging said inner race rearwardly against said worm gear and said worm gear against said shoulder, and a stop nut on said transmission shaft rearward of said bevel gear for positioning said retainer forwardly against said shoulder.
Claim 4
Dependent Claim
67 words
The structure of claim 2 wherein said spring biased detent means includes a pair of cylindrical detents extending longitudinally through respective diametrically opposed openings in a forward wall of said retainer, each detent having an enlarged surface within said retainer and a rearwardly opening recess, and a compression spring seated in each of said detent recesses and in abutment with a forward surface of said bevel gear.
Claim 5
Dependent Claim
43 words
The structure of claim 1 wherein said one-way drive connectiOn includes a transversely slotted recess extending partially across said transmission shaft, and a spring biased detent carried by and extending transversely of said retainer for engagement in said shaft recess when aligned therewith.
References Cited (Backward Citations)
US3559499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |