US3181467A - Control mechanisms - Google Patents

Control mechanisms Download PDF

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Publication number
US3181467A
US3181467A US299265A US29926563A US3181467A US 3181467 A US3181467 A US 3181467A US 299265 A US299265 A US 299265A US 29926563 A US29926563 A US 29926563A US 3181467 A US3181467 A US 3181467A
Authority
US
United States
Prior art keywords
projections
arresting member
disc
arresting
rotatable
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
US299265A
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English (en)
Inventor
Jacob John Edmund Baldwin
Sowerby James Mcgregor
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.)
BAC AND BRITISH AEROSPACE
BAE Systems PLC
Original Assignee
British Aircraft Corp 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 British Aircraft Corp Ltd filed Critical British Aircraft Corp Ltd
Application granted granted Critical
Publication of US3181467A publication Critical patent/US3181467A/en
Assigned to BRITISH AEROSPACE PUBLIC LIMITED COMPANY reassignment BRITISH AEROSPACE PUBLIC LIMITED COMPANY CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE JAN. 2, 1981 Assignors: BRITISH AEROSPACE LIMITED
Assigned to BAC AND BRITISH AEROSPACE reassignment BAC AND BRITISH AEROSPACE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BRITISH AIRCRAFT CORPORATION LIMITED,
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
    • F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
    • F42C15/24—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein the safety or arming action is effected by inertia means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
    • F42C15/18—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a carrier for an element of the pyrotechnic or explosive train is moved
    • F42C15/188—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a carrier for an element of the pyrotechnic or explosive train is moved using a rotatable carrier
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
    • F42C15/28—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges operated by flow of fluent material, e.g. shot, fluids
    • F42C15/31—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges operated by flow of fluent material, e.g. shot, fluids generated by the combustion of a pyrotechnic or explosive charge within the fuze
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
    • F42C15/44—Arrangements for disarming, or for rendering harmless, fuzes after arming, e.g. after launch
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C9/00—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition
    • F42C9/02—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition the timing being caused by mechanical means
    • F42C9/04—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition the timing being caused by mechanical means by spring motor
    • F42C9/041—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition the timing being caused by mechanical means by spring motor the clockwork activating a security device, e.g. for unlocking the firing-pin
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C9/00—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition
    • F42C9/02—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition the timing being caused by mechanical means
    • F42C9/04—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition the timing being caused by mechanical means by spring motor
    • F42C9/048—Unlocking of clockwork mechanisms, e.g. by inertia or centrifugal forces; Means for disconnecting the clockwork mechanism from the setting mechanism

Definitions

  • a control mechanism includes a rotatable member having. one or more projections, and an arresting member arranged for'movement in response to an actuating force of a predetermined value from a first position in which, when the rotatable member is rotated in one direction, the arresting member will engage the projection, or one of the projections, so as to arrest the rotatable member, to a second portion in which the arresting member is clear of the projection or projections, the arresting member being arranged also to return from the second position to the first position if the actuating force is reduced below its predetermined value, and the mechanism being arranged so that the arresting member then locks the rotatable member permanently against further rotation in the same direction.
  • FIGURE 1 is a sectional end view of the mechanism taken on the line II of FIGURE 2;
  • FIGURE 2 is a section taken on the line IIII of FIGURE 1; and,
  • FIGURE 3 is a detail view in the direction of the arrow III in FIGURE 1. 1
  • the missile has a warhead (see FIGURE 2), to the rear end of which a support block 11 is secured by means of a locking ring 12; the ring 12 is screwed into the support block 11 and abuts against a ring 10a formed circumferentially on the warhead, so asto hold the ring 19a against a shoulder 11a in the block.
  • the block 11 has a spigot portion 11b formed adjacent its front end, and the open end of a cylindrical casing 13, having its other end 13a closed, engages the spigot portion 11b and is secured to the block 11 by means not shown.
  • a cartridge 14 is located in the block 11 behind the warhead 10; and an igniter 15 is located, co-axially behind the cartridge 14, in a further support block 11c which is secured by screws lid to the support block 11.
  • the igniter 15 is arranged to be operated electrically by a crush switch (not shown) on the front of the warhead, and is separated from the cartridge 14 by a rotatable disc 16 mounted on the support block 11.
  • the disc 16 is arranged to be rotated at a constant speed in the direction shown in FIGURE 1, through a pinion 17 and a gear ring 18 attached to the,disc 16, by an escapement-controlled clockwork mechanism housed within the block 11 but not shown in the drawings.
  • the disc 16 is restrained from rotation by a plunger 19 engaging a notch 16a on the circumference of the disc.
  • the plunger 19 is ice movable, upwardly as seen in FIGURE 2, by an explosive device (not shown) which is arranged to be operated electrically at a convenient time, for example at the moment of firing the missile, so as to initiate rotation of the disc.
  • a catch 20 on the circumference of the disc 16 is arranged for engagement with a fixed stop 21, to bring the disc to rest at the desired position at the end of its rotation, in which position the catch 20 also engages a spring locking pawl 22 fixed to the block 11, so as to prevent rotation of the disc in the reverse direction.
  • a detonator 23 is set in the disc in such a position that when the catch 20 is engaging the stop 21, the detonator 23 lies immediately between and adjacent to the igniter 15 and cartridge 14.
  • the disc 16 In operation, on the firing of the explosive device which frees the plunger 19 from the notch 16a, the disc 16 is free to rotate, and the clockwork mechanism may then rotate the disc for a predetermined time through part of one revolution, after which the clockwork is so arranged that it causes the disc to move as quickly as possible into the position in which the catch 20 engages the stop 21.
  • This position of the mechanism will be referred to herein as the armed position, while the position shown in the drawings will be called the normal position.
  • the predetermined time of rotation mentioned above may have any appropriate value: in a typical case it is 2 /2 seconds.
  • the igniter 15 When operation of the crush switch causes the igniter 15 to be fired, for example by impact of the missile with a body, the igniter ignites the detonator 23, which in turn detonates the cartridge 14 so as to cause the warhead 10 to explode.
  • a hollow cylindrical housing 26 In the block 11 and parallel to the axis of rotation of the disc is mounted a hollow cylindrical housing 26.
  • the end of the housing 26 nearest the disc 16 carries a forward stop block 27 having an axial hole formed therein.
  • An acceleration-sensitive plunger 23 is mounted so as to befree to move axially in the housing 26 and block 27, and is biased towards the position shown in FIGURE 2 by a compression spring 29 acting between the block 27 and a ring 30 secured to the plunger 28.
  • the plunger 28 has a head 31, shown in FIGURE 3, comprising a block portion 310 and a projecting portion 31b.
  • the head 31 is preventedfrom rotating by two stops 27a on the block 27.
  • the plunger 28 is positioned so that, with the mech anism in the normal position, the edge of the disc 16 is level with the head, and the projection 31b lies behind the disc, as shown in FIGURE 3. Moreover the plunger 28 is aligned with the direction of flight of the missile, the end of the plunger carrying the head 31 being the rear end.
  • the spring 29 moves the plunger 28 back again so that the trailing portion 25b of a catch 25 strikes the block portion 31a of the head 31 of the plunger, thus arresting the disc.
  • the leading portion 25a ot the catch lies in the position shown in FIGURE 3 relative to the head 31, so that the projection 31b prevents the plunger head 'from moving free of the disc again even if the acceleration is increased once more above the previously-mentioned predetermined value.
  • the clockwork which operates the disc 16 prevents the disc rotating in reverse, so that the whole mechanism is now locked in an inherently safe position intermediate the norma and armed positions, so that the missile cannot thereafter become armed.
  • the plunger 28 may be set into vibration which causes it to oscillate back and forth along its axis so that its head 31 is clear of the disc 16 (in the position shown by broken lines in FIGURE 3) at some instants even though the acceleration of the missile is less than the predetermined amount required to maintain the plunger in that position. This could for example occur if the missile hit something while the disc was still rotating.
  • the spacing between the catches 25 is preferably irregular, and arranged so that under vibration conditions the head 31 of the plunger will hit one or other of the catches, whereupon both plunger and disc will be brought to a halt. It is thus arranged that the missile only becomes armed when subjected to a continuous acceleration above the predetermined value for the predetermined time.
  • the number of catches 25 need not be six but may be any convenient number, and the catches can be arranged to cooperate with any suitable device besides-- or instead o'f- -a plunger sensitive to acceleration such as that described herein.
  • a solenoid-operated plunger having a head similar to the head 31 may be included in a safety circuit of the missile so as to engage a catch 25 in the event of failure of any component of the missile.
  • a time-delay control mechanism for a missile having a warhead comprising a rotatable disc member formed with a plurality of radial projections at intervals around its periphery, an arresting member eo-openable with the said radial projections, spring means urging the arresting member in one direction towards a first position and inertia means for moving the arresting member against the action of the spring means to a second position when the missile has a predetermined acceleration, the projections on the disc member each comprising a leading part and a trailing part which extends radially outwards beyond the leading part, and the arresting member being also in two parts, one of which overlaps and can engage only the trailing parts of the projections, and the other of which projects outwards to a greater extent and overlaps both parts of the projections.
  • a control mechanism comprising a rotatable member rotatable about a fixed axis and formed with a plurality of projections at intervals around the said axis, ro-
  • tary drive means for rotating the rotatable member about its axis in a given direction, an arresting member cooperable with the said projections, biasing means urging the arresting member in one direction towards a first position, and variable force-applying means for moving the arresting member against the action of the said biasing means to a second position, the projections on the rotatable member being engageable with the arresting member when the arresting member is in its first position, said projections and arresting member comprising interengaging means for preventing movement of the arresting member away from its first position once the arresting member has engaged any one of the projections, the inter-engagement of the arresting member with one of the projections being effective also in preventing further rotation of the rotatable member in the said given direc tion.
  • a control mechanism in which the arresting member is urged by a spring towards the first position, and in which the means moving the arresting member towards its second position, against the action of the spring, comprise inertia means responsive to an ecceleration force during use.
  • a control mechanism according to claim 3 for a missile having a warhead including a stop which the rotatable member must reach before the warhead can be ignited.
  • a control mechanism for a missile having a warhead including, -a stop which the rotatable member must reach before the warhead can be ignited, the rotary drive means for the rotatable memher being a two-speed clockwork motor which rotates the rotatable member slowly at first and then quickly to the position in which the rotatable member engages the stop.
  • a control mechanism in which the projections are at irregular intervals around the axis of the rotatable member.
  • a missile including a warhead and a time-delay control mechanism comprising a rotatable member rotatable about a fixed axis and formed with a plurality of projections at intervals around the said axis, rotary drive means for rotating the rotatable member about its axis in a given direction, means for igniting the warhead of the missile when the rotatable member reaches an armed position, an arresting member co-operable with the said projections, biasing means urging the arresting member in one direction towards .a first position, and variable force-applying means for moving the arresting member against the action of the said biasing means to a second position, the projections on the rotatable member being engageable with the arresting member when the arresting member is in its first position, the said projections and arresting member including inter-angaging means which act to prevent movement of the arresting member away from its first position once the arresting member ha engaged any one of the projections, the inter-engagement of the arresting member with one of the projections
  • a missile including a warhead and a time-delay control mechanism comprising a rotatable member rotatable about a fixed axis and formed with a plurality of projections at intervals around the said axis, rotary drive means for rotating the rotatable member about its axis in a given direction, means for igniting the warhead of the missile when the rotatable member reaches an armed position, an arresting member co -operable with the said projections, biasing means for urging the arresting member in one direction towards a first position, in which the arresting member i engageable with the projections, and inertia means for moving the arresting member against the action of the said biasing means to a second position, in which the arresting member is clear of engagement with the projections, the said projections and arresting member including inter-engaging means which act to prevent movement of the arresting member away from its first position once the arresting member has engaged any one of the projections, the inter-engagement of the arresting member with one of the projection

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Radar Systems Or Details Thereof (AREA)
US299265A 1962-08-03 1963-08-01 Control mechanisms Expired - Lifetime US3181467A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB29852/62A GB1046249A (en) 1962-08-03 1962-08-03 Control mechanisms for delayed arming of guided missiles

Publications (1)

Publication Number Publication Date
US3181467A true US3181467A (en) 1965-05-04

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ID=10298253

Family Applications (1)

Application Number Title Priority Date Filing Date
US299265A Expired - Lifetime US3181467A (en) 1962-08-03 1963-08-01 Control mechanisms

Country Status (3)

Country Link
US (1) US3181467A (de)
DE (1) DE1196101B (de)
GB (1) GB1046249A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0243987A1 (de) * 1986-03-13 1987-11-04 Affärsverket FFV Sicherheitsvorrichtung für Artilleriegeschosszünder
US4793257A (en) * 1987-04-16 1988-12-27 Morton Thiokol, Inc. Safety and arming mechanism
WO1996035095A1 (de) * 1995-05-05 1996-11-07 Dixi S.A. Sicherheitseinrichtung für einen aufschlagzünder
WO1997012196A1 (en) * 1995-09-28 1997-04-03 Alliant Techsystems Inc. Electro-mechanical safety and arming device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2897760A (en) * 1943-04-02 1959-08-04 Lewis M Mott-Smith Safety device
US2948219A (en) * 1953-03-12 1960-08-09 Winfred F Sapp Rocket fuze
US3059577A (en) * 1960-01-07 1962-10-23 Frank C Hutchison Fuze arming device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2897760A (en) * 1943-04-02 1959-08-04 Lewis M Mott-Smith Safety device
US2948219A (en) * 1953-03-12 1960-08-09 Winfred F Sapp Rocket fuze
US3059577A (en) * 1960-01-07 1962-10-23 Frank C Hutchison Fuze arming device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0243987A1 (de) * 1986-03-13 1987-11-04 Affärsverket FFV Sicherheitsvorrichtung für Artilleriegeschosszünder
US4722277A (en) * 1986-03-13 1988-02-02 Affarsverket Ffv Safety means for an ordnance fuze
US4793257A (en) * 1987-04-16 1988-12-27 Morton Thiokol, Inc. Safety and arming mechanism
WO1996035095A1 (de) * 1995-05-05 1996-11-07 Dixi S.A. Sicherheitseinrichtung für einen aufschlagzünder
WO1997012196A1 (en) * 1995-09-28 1997-04-03 Alliant Techsystems Inc. Electro-mechanical safety and arming device
US5693906A (en) * 1995-09-28 1997-12-02 Alliant Techsystems Inc. Electro-mechanical safety and arming device

Also Published As

Publication number Publication date
DE1196101B (de) 1965-07-01
GB1046249A (en) 1966-10-19

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Legal Events

Date Code Title Description
AS Assignment

Owner name: BRITISH AEROSPACE PUBLIC LIMITED COMPANY

Free format text: CHANGE OF NAME;ASSIGNOR:BRITISH AEROSPACE LIMITED;REEL/FRAME:004080/0820

Effective date: 19820106

Owner name: BRITISH AEROSPACE PUBLIC LIMITED COMPANY, DISTRICT

Free format text: CHANGE OF NAME;ASSIGNOR:BRITISH AEROSPACE LIMITED;REEL/FRAME:004080/0820

Effective date: 19820106

AS Assignment

Owner name: BAC AND BRITISH AEROSPACE, BROOKLANDS RD., WEYBRID

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BRITISH AIRCRAFT CORPORATION LIMITED,;REEL/FRAME:003957/0227

Effective date: 19811218