Patent US3778010A successfully refreshed from Google Patents.
US3778010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircrew escape systems
Assignee: BAE Systems PLC
•
Filing: 1972-01-14
•
Granted: 1973-12-11
•
Expires: 1992-01-14
Abstract
Abstract A canopy transparency break-up system is provided, for use in emergency escape from an aircraft through the cockpit canopy, in which miniature detonating cord (MDC) is held in place around the periphery of the transparency, or a selected area of the transparency, and is formed into loops at intervals which loops act as crack iniators when the cord is detonated. The cord is clamped in place, without adhesive, by means of retaining plates of springy steel which are bolted to the canopy frame and are segmented by transverse slots at intervals along their lengths, these plates having appropriate extensions or tongues in the regions where the cord loops occur. The cord ends are brought into contiguity within a common detonator unit the axis of which is at right angles to the axes of the cord ends.
Inventors
- 👤 F Potts
- 👤 G Wickenden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:25
CPC Classifications
B; B64; B64D; B64D25/00; B64D25/08; B64C; B64C1/00; B64C1/14; B64C1/1476
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
67 words
An aircraft canopy emergency break-up system comprising: a detonating cord and retaining plates for maintaining said cord in intimate contact with an aircraft canopy at a desired pressure per inch throughout various temperature and pressure changes imposed by flight and ground conditions while affording a measure of detonation protection, said retaining plate is segmented by transverse cuts extending partially across the plate at intervals along its length.
Claim 2
Dependent Claim
67 words
An aircraft canopy emergency break-up system comprising: a detonating cord and retaining plates for maintaining said cord in intimate contact with an aircraft canopy at a desired pressure per inch throughout various temperature and pressure changes imposed by flight and ground conditions while affording a measure of detonation protection, said retaining plate is segmented by transverse cuts extending partially across the plate at intervals along its length.
Claim 3
Dependent Claim
38 words
A system according to claim 1 wherein is provided means for securing said retaining plate along its continuous longitudinal edge to the canopy frame, the slotted longitudinal edge comprising a part circular recess to receive said detonating cord.
Claim 4
Dependent Claim
20 words
A system according to claim 2, wherein the cord, held by the retaining plates, is sheathed within an elastomeric extrusion.
Claim 5
Dependent Claim
16 words
A system according to claim 2, wherein the retaining plates are made of springy metal plate.
Claim 6
Dependent Claim
41 words
A system according to claim 2 wherein said detonating cord is arranged with local loops to act as initiators of cracks transverse to the longitudinal edge of said retaining plates, said retaining plates having local extensions to back up said loops.
Claim 7
Dependent Claim
42 words
A system according to claim 2 further comprising a detonating unit and wherein the ends of said detonator cord are received in said detonating unit of which the axis of detonation is at right angles to the axes of the cord ends.
Claim 8
Dependent Claim
28 words
A system according to claim 6, wherein, within the detonator unit, the cord ends are brought into side-by-side contiguity, and wells are provided to receive any surplus cord.
Claim 9
Dependent Claim
29 words
A system according to claim 6, wherein, between the last retaining plates and the detonator unit, portions of the MDC that would otherwise be unsupported are contained in conduits.
References Cited (Backward Citations)
GB698226A
Cited
US3135163A
Cited
US3139031A
Cited
US3185090A
Cited
US3248072A
Cited
US3336868A
Cited
US3465482A
Cited
US3486410A
Cited
US3561703A
Cited
US3729154A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |