EP0267699B1 - Releasable closure arrangement - Google Patents

Releasable closure arrangement Download PDF

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Publication number
EP0267699B1
EP0267699B1 EP19870309191 EP87309191A EP0267699B1 EP 0267699 B1 EP0267699 B1 EP 0267699B1 EP 19870309191 EP19870309191 EP 19870309191 EP 87309191 A EP87309191 A EP 87309191A EP 0267699 B1 EP0267699 B1 EP 0267699B1
Authority
EP
European Patent Office
Prior art keywords
housing
closure member
closure
resilient means
arrangement according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19870309191
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0267699A3 (en
EP0267699A2 (en
Inventor
Leonard John Willis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BAE Systems Electronics Ltd
Original Assignee
GEC Marconi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GEC Marconi Ltd filed Critical GEC Marconi Ltd
Publication of EP0267699A2 publication Critical patent/EP0267699A2/en
Publication of EP0267699A3 publication Critical patent/EP0267699A3/en
Application granted granted Critical
Publication of EP0267699B1 publication Critical patent/EP0267699B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B22/00—Buoys
    • B63B22/003—Buoys adapted for being launched from an aircraft or water vehicle;, e.g. with brakes deployed in the water

Definitions

  • This invention relates to a releasable closure arrangement and particularly to a closure arrangement designed to release a load on impact with a surface of water.
  • EP 0,061,398 describes a closure arrangement for releasing a cylindrical object from a vehicle.
  • the object is held in a container by means of a lockable end cap.
  • An inflatable bladder within the container and to the rear of the object is used to eject the object.
  • the bladder is inflated and the end cap is unlocked by remote control, causing both object and end cap to be ejected by the inflation pressure of the bladder.
  • An object of this invention is to provide a releasable closure arrangement which alleviates these problems.
  • a releasable closure arrangement of the type comprising a housing and a closure member adapted to fit loosely in the housing is characterised by further comprising resilient means adapted to fit in a compressed condition in a predetermined stable position between the closure member and the housing to hold the closure member in the housing, the inner surface of the housing and the outer surface of the closure member being of such formation that forcible displacement of the closure member into the housing causes said resilient means to be dislodged from said stable position into a relatively unstressed condition allowing the closure member to be released from the housing.
  • the inner surface of the housing or the outer surface of the closure member or both may have which is complementary to the shape of the resilient means so as to afford further support for said resilient means.
  • the resilient means may be prevented from moving from said stable position into the housing by a shoulder protruding from the inner surface of the housing.
  • the closure member is preferably free to move from the housing after dislodgement of the resilient means.
  • the resilient means is preferably an elastic O-ring arranged to be stretched about the closure member in said stable position and to relax to a smaller diameter when the closure member is forcibly displaced into the housing.
  • the arrangement preferably includes means to limit the movement of the closure member into the housing.
  • the arrangement may include a removable spigot arranged to engage a hole in the housing to prevent release of the closure member.
  • the spigot may be one of a number on a ring arranged to be placed about the housing and to be readily removable.
  • FIG. 1 The arrangement shown in the drawings comprises a housing 1 containing sonar equipment 3 sealed with a nosecap 5 which is designed to be released on impact with the water, the whole system being deployed from an aircraft.
  • Figure 1 shows the equipment 3 held in place by the closure member (nosecap 5) which is itself held in place by a stretched elastic O-ring 7.
  • the housing 1, equipment 3 and nosecap 5 are all of circular cross-section. On impact with the water the nosecap 5 is forced upwards, the O-ring is prevented from following by the formation of the inner wall 2 of the housing, snaps off the nosecap into a relaxed condition and the nosecap, equipment and O-ring are all then free to descend out of the housing 1 into the water.
  • a groove 11 is cut in the inner wall 2 near the mouth of the housing 1 whilst the nosecap 5 is formed with a roundcut shoulder or ridge 9.
  • the nosecap When the nosecap is assembled in the housing the hollow beneath the ridge 9 is aligned with the groove 11 so an annular channel is formed between the two members.
  • Jigging pins 13 (one shown) are used in the assembly and then removed.
  • the O-ring 7 is stretched about the nosecap to abut the ridge 9 and, when assembled, is compressed tightly in the channel between the two members. With the O-ring held in this stable position the nosecap is supported in the housing, and the nosecap 5 in turn supports the sonar equipment 3 which rests on a resilient foam pad 12.
  • the ridge 9 can be omitted if the frictional resistance is high enough or the equipment 3 light enough.
  • the groove 11 may be formed with a protruding lower edge on which the O-ring can rest.
  • Figure 2 shows the system immediately after its impact on the surface of the water.
  • the nosecap 5 is forced upwards into the housing.
  • the O-ring however, is trapped in its stable position by the upper edge of the groove 11 and cannot move with the nosecap.
  • the inner diameter of the housing 1 becomes less than the outer diameter of the nosecap 5.
  • the shoulder 10 formed at this change of diameter limits the nosecap's upward travel but allows it to move far enough to release the O-ring as a part of the nosecap of decreased diameter moves adjacent the O-ring. This therefore relaxes, springing away from the housing wall.
  • the equipment 3, nosecap 5 and O-ring 7 are then free to descend under gravity into the water.
  • the nosecap may take a variety of shapes besides that shown in the drawings, though a rounded surface is preferable for smooth entry into the water.
  • the O-ring is not necessarily released from the nosecap - it could simply snap on to a narrower part of it.
  • the jigging pins 13 shown in Figure 1 may be replaced with spigots or pins which prevent the nosecap from moving up into the housing.
  • these security pins could be arranged to penetrate the housing and the nosecap so as to hold the nosecap fixedly in the housing.
  • the pins (or pin) may be replaced with a throwaway ring made of plastic, say, supporting a number of spigots which engage spigot holes in the housing. The ring is split in one place and snaps about the housing. It can then be quickly and easily removed immediately before launch.
  • Resilient balls or cylindrical blocks could be used instead of an O-ring.
  • the force required to release the nosecap is determined by the degree of compression of the O-ring or other resilient means between the housing and the nosecap. For a system intended to be launched from an aircraft this force determines the minimum launch height.

Landscapes

  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Power-Operated Mechanisms For Wings (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Casings For Electric Apparatus (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
EP19870309191 1986-11-12 1987-10-19 Releasable closure arrangement Expired EP0267699B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB868626967A GB8626967D0 (en) 1986-11-12 1986-11-12 Releasable closure arrangement
GB8626967 1986-11-12

Publications (3)

Publication Number Publication Date
EP0267699A2 EP0267699A2 (en) 1988-05-18
EP0267699A3 EP0267699A3 (en) 1988-08-31
EP0267699B1 true EP0267699B1 (en) 1992-05-13

Family

ID=10607179

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870309191 Expired EP0267699B1 (en) 1986-11-12 1987-10-19 Releasable closure arrangement

Country Status (3)

Country Link
EP (1) EP0267699B1 (es)
ES (1) ES2031908T3 (es)
GB (2) GB8626967D0 (es)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2502576A1 (fr) * 1981-03-24 1982-10-01 Milioti Joseph Procede et dispositifs pour stocker et larguer un objet cylindrique a partir d'un vehicule
CA1202606A (en) * 1984-02-15 1986-04-01 Michel C. St-Onge Tension link for parachute/payload separation

Also Published As

Publication number Publication date
GB8724417D0 (en) 1987-11-25
EP0267699A3 (en) 1988-08-31
EP0267699A2 (en) 1988-05-18
GB2198421A (en) 1988-06-15
GB2198421B (en) 1990-09-12
ES2031908T3 (es) 1993-01-01
GB8626967D0 (en) 1987-03-18

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