US3901155A - Self-sealing ignition device - Google Patents

Self-sealing ignition device Download PDF

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Publication number
US3901155A
US3901155A US429735A US42973574A US3901155A US 3901155 A US3901155 A US 3901155A US 429735 A US429735 A US 429735A US 42973574 A US42973574 A US 42973574A US 3901155 A US3901155 A US 3901155A
Authority
US
United States
Prior art keywords
housing
bore
firing pin
charge
inner part
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 - Lifetime
Application number
US429735A
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English (en)
Inventor
Paul Huber
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.)
Buck KG
Original Assignee
Buck KG
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
Priority claimed from DE19732300464 external-priority patent/DE2300464C3/de
Application filed by Buck KG filed Critical Buck KG
Application granted granted Critical
Publication of US3901155A publication Critical patent/US3901155A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C7/00—Fuzes actuated by application of a predetermined mechanical force, e.g. tension, torsion, pressure
    • F42C7/12—Percussion fuzes of the double-action type, i.e. fuzes cocked and fired in a single movement, e.g. by pulling an incorporated percussion pin or hammer

Definitions

  • Devices of this type consist of a cylindrical housing, in which a percussion cap and possibly a delay action composition are housed, and in which a firing pin slides.
  • the firing pin can be cocked by means of a compression spring, and can be set to fire by means of a shiftable locking member.
  • Such firing pin igniters are known, for example, from German patent 1,213,326 and they serve as so-called manually operated friction igniters for igniting detonators, hand grenades etc.
  • One disadvantage of the known manually operated friction igniters of this type of construction consists in the fact that they are susceptible to the influence of moisture. It is true that in the case of the known design the locking member is developed as a plug, divided several times in a longitudinal direction, which offers a certain amount of protection against moisture. This protection against moisture however, will be insufficient because a really tight press fit of the locking plug in the cylinder housing would prevent a perfect pulling-off of the igniter.
  • the cylinder housing will be completely open after pulling the locking plug from said housing, which makes a use of the igniter underwater impossible; after pulling out of the locking member by means of the pull-cord, water would immediately flow into the cylinder housing and would extinguish the already-ignited delay action com position.
  • the firing pin consists of three parts releasably connected with one another. These parts comprise an upper part, representing the locking member and which can be pulled out of the cylinder housing; a middle part which can be shifted within the cylinder housing and which can remain sealed in the housing; and a lower part representing the striker plate and slideable in the cylinder housing.
  • the igniter has a cylindrical housing 10a, 10b, which comprises an igniter head 10a and an igniter neck 10b.
  • the head 10a and neck 10b can be threadably secured together and attached to a suitable explosive device in a conventional manner.
  • a tripartite firing pin 11, 12, 13 In a bore of the cylinder housing there is disposed a tripartite firing pin 11, 12, 13.
  • the firing pin upper or outer part 11 represents the locking member, customary in case of such igniters and has a hook-like extension 11a, which engages a constriction or recess 12a of the firing pin-middle part 12.
  • the firing pin middle part 12 comprises a shaft, which is surrounded by a helical compression spring 14.
  • the firing pin lower or inner part 13 represents the customary firing pin plate and is connected with the middle part 12 by way of connecting balls 15. These balls partially engage a constriction or recess 12b of the firing pin middle part 12 and partially engage bores 13a in an overlapping edge of the plate 13. Furthermore, an escape groove 16 for the connecting balls 15 is moulded into the cylinder neck 10b. A sealing ring washer 17 is clamped between the parts 10a and 10b of the cylinder housing and presses against the pin middle part 12 above the area of the compression spring to seal the bore, and thus is of considerable importance.
  • the firing pin locking member 1 l is connected with a manually operable pull cord 20, which is attached at its other end to an unscrewable cap 21.
  • the hookextension-lla slips out of its slidable connection with the constriction 12a of the middle part.
  • the middle part 12 thus remains stuck in the cylinder housing while maintaining its seal. From all this it follows that the middle part 12 is in connection with the seal ring washer 17 and securely seals the bore of the cylinder housing 10a, 10b, not only prior to but also after the functioning of the igniter. Contrary to the previously known igniters, this present igniter therefore can also be used underwater, since even after pulling out of the locking member 11 from the cylinder housing, and the impact of the firing pin plate 13 on the percussion cap, no water can reach the small delay action tube 19 through the bore of the cylinder housing.
  • the seal ring washer 17 is an O-ring made of rubber or plastic, say teflon or polyethylene; it can also consist of a teflon cord.
  • a firing pin ignitor suitable for release by a pullcord, said ignitor including a housing having a bore, a percussion-sensitive charge in said housing, and activating means for activating said charge while maintaining a moisture seal before and after activation of said charge; said activating means comprising:
  • sealing means operable to seal said bore against moisture
  • firing pin slidably disposed in said bore of said housing, said firing pin including: an outer part outwardly removable from said housing, an inner part including a portion arranged to displace said spring means in an energy-storing manner during outward movement of said firing pin to impart inward biasing force to said inner part, and a middle part;
  • said middle part being releasably coupled to said inner part by first connecting means arranged to release said inner part for movement toward said charge after said spring means has been displaced during outward movement of said firing pin;
  • middle part being releasably coupled to said outer part by second connecting means arranged to release said middle part from said outer part subsequent to said release of said inner part and while said middle part and said sealing means are in sealing relationship relative to said bore, so that said middle part seals said bore subsequent to activation of said percussion-sensitive charge by said inner part.
  • Apparatus as defined in claim 2 wherein the slidably releasable connection between said outer and middle parts comprises a hook-like extension of said outer part which seats within a recess of said middle part.
  • the slidably releasable connection between said middle and inner parts comprises a plurality of connecting balls mounted partially in recess means of said middle part and partially in recess means of said inner part; said housing bore including escape groove means disposed for alignment with said connecting balls in response to said predetermined movement of said firing pin such that movement of said connecting balls into said escape groove releases said inner part from said middle part.
  • the slidably releasable connection between said middle and inner parts comprises a plurality of connecting balls mounted partially in recess means of said middle part and partially in recess means of said inner part; said housing bore including escape groove means disposed for alignment with said connecting balls in response to said predetermined movement of said firing pin such that movement of said connecting balls into said escape groove releases said inner part from said middle part.
  • said sealing means comprises a seal ring washer disposed in said housing remote from said spring; said seal washer being arranged in said bore to sealingly engage said middle part before and after activation of said charge.
  • said sealing means comprises a seal ring washer disposed in said housing remote from said spring means; said seal washer being arranged in said bore to sealingly engage said middle part before and after activation of said charge.
  • said housing comprises a head section and a neck section arranged for threaded engagement; said seal washing being clamped between said head and neck sections.
  • Apparatus as defined in claim 1 including a delay action composition for the firing mechanism.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Automotive Seat Belt Assembly (AREA)
US429735A 1973-01-05 1974-01-02 Self-sealing ignition device Expired - Lifetime US3901155A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732300464 DE2300464C3 (de) 1973-01-05 Mittels Zug auslösbarer Schlagbolzenzünder

Publications (1)

Publication Number Publication Date
US3901155A true US3901155A (en) 1975-08-26

Family

ID=5868367

Family Applications (1)

Application Number Title Priority Date Filing Date
US429735A Expired - Lifetime US3901155A (en) 1973-01-05 1974-01-02 Self-sealing ignition device

Country Status (6)

Country Link
US (1) US3901155A (it)
BE (1) BE809310A (it)
FR (1) FR2213478B1 (it)
GB (1) GB1444691A (it)
IT (1) IT1001377B (it)
SE (1) SE408593B (it)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008666A (en) * 1974-02-26 1977-02-22 Hagenuk & Co. Gmbh Percussion igniter
US4020764A (en) * 1974-02-26 1977-05-03 Hagenuk & Co. Gmbh Detonator
US4038924A (en) * 1974-03-19 1977-08-02 Hagenuk & Co Gmbh Igniter for fuses and the like
US4338861A (en) * 1980-09-08 1982-07-13 The United States Of America As Represented By The Secretary Of The Army High "G" firing mechanism
US4509427A (en) * 1983-03-14 1985-04-09 The United States Of America As Represented By The Secretary Of The Navy Tail fin firing device
US5038665A (en) * 1990-02-02 1991-08-13 Honeywell Inc. Silent stud gun attachment device

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2202764C2 (ru) * 2000-05-15 2003-04-20 Российский Федеральный Ядерный Центр - Всероссийский Научно-Исследовательский Институт Экспериментальной Физики Взрывное устройство механического типа
RU2204112C2 (ru) * 2001-03-28 2003-05-10 Российский Федеральный Ядерный Центр - Всероссийский Научно-Исследовательский Институт Экспериментальной Физики Взрыватель
RU2226665C2 (ru) * 2002-04-01 2004-04-10 Российский Федеральный Ядерный Центр - Всероссийский Научно-Исследовательский Институт Экспериментальной Физики Воспламенитель детонирующего устройства
CN112461056B (zh) * 2020-10-30 2023-02-03 四川航天川南火工技术有限公司 一种具有撞击击发功能的机械起爆器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2873648A (en) * 1953-05-07 1959-02-17 Musser C Walton Remote control fluid pressure responsive actuator
US3260206A (en) * 1963-02-13 1966-07-12 Rinker Fa R Detonator
US3388879A (en) * 1967-07-31 1968-06-18 Army Usa Electronically time delayed cutter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2873648A (en) * 1953-05-07 1959-02-17 Musser C Walton Remote control fluid pressure responsive actuator
US3260206A (en) * 1963-02-13 1966-07-12 Rinker Fa R Detonator
US3388879A (en) * 1967-07-31 1968-06-18 Army Usa Electronically time delayed cutter

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008666A (en) * 1974-02-26 1977-02-22 Hagenuk & Co. Gmbh Percussion igniter
US4020764A (en) * 1974-02-26 1977-05-03 Hagenuk & Co. Gmbh Detonator
US4038924A (en) * 1974-03-19 1977-08-02 Hagenuk & Co Gmbh Igniter for fuses and the like
US4338861A (en) * 1980-09-08 1982-07-13 The United States Of America As Represented By The Secretary Of The Army High "G" firing mechanism
US4509427A (en) * 1983-03-14 1985-04-09 The United States Of America As Represented By The Secretary Of The Navy Tail fin firing device
US5038665A (en) * 1990-02-02 1991-08-13 Honeywell Inc. Silent stud gun attachment device

Also Published As

Publication number Publication date
FR2213478B1 (it) 1978-11-10
SE408593B (sv) 1979-06-18
IT1001377B (it) 1976-04-20
FR2213478A1 (it) 1974-08-02
BE809310A (fr) 1974-04-16
DE2300464A1 (de) 1974-07-11
DE2300464B2 (de) 1976-07-08
GB1444691A (en) 1976-08-04

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