US2718850A - Clockwork movement for a projectile - Google Patents

Clockwork movement for a projectile Download PDF

Info

Publication number
US2718850A
US2718850A US249479A US24947951A US2718850A US 2718850 A US2718850 A US 2718850A US 249479 A US249479 A US 249479A US 24947951 A US24947951 A US 24947951A US 2718850 A US2718850 A US 2718850A
Authority
US
United States
Prior art keywords
projectile
movement
axis
movable member
mass
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
US249479A
Other languages
English (en)
Inventor
Kuhn Georges
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.)
Mefina SA
Original Assignee
Mefina SA
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 Mefina SA filed Critical Mefina SA
Application granted granted Critical
Publication of US2718850A publication Critical patent/US2718850A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F42C15/18—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
    • F42C15/20—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a securing-pin or latch is removed to arm the fuze, e.g. removed from the firing-pin
    • F42C15/22—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a securing-pin or latch is removed to arm the fuze, e.g. removed from the firing-pin using centrifugal force
    • 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
    • F42C9/14—Double fuzes; Multiple fuzes
    • 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
    • F42C9/14—Double fuzes; Multiple fuzes
    • F42C9/16—Double fuzes; Multiple fuzes for self-destruction of ammunition

Definitions

  • detonator safety devices consist in separating the parts sensitive to firing, from the main charge which is less sensitive. The separated portions are placed into instantaneous communication after the firing of the shot or, at least later, after the cessation of acceleration. In other forms of construction, the placing in communication of the separated parts is retarded by pyrophoric means.
  • these safety devices for the detonator can only be used in practice in connection with fuses of large calibre by reason of their size.
  • the present invention has for its subject a clockwork movement for a projectile, acting as a safety device for the detonator.
  • the clockwork movement has a movable member set in operation after the firing of the shot, and which controls the movement towards its armed position, of at least a portion of the primer of the projectile, mounted on a movable part, and holding it spaced from its armed position and from the main charge, in the unarmed position of the fuse and from the beginning of firing, during a period of time determined by the operation of the movement.
  • Fig. l is a view in axial section of a first form of construction of the safety device for the detonator combined with a clockwork movement, the members being shown in the unarmed position.
  • Fig. 2 is a section on the line II-II of Fig. l
  • Fig. 3 is a section on the line III-III of Fig. 1.
  • Fig. 4 is a section similar to Fig. 2 showing the position of the members in the armed position.
  • Fig. 5 shows, in elevation and in section a second form of construction applied to a fuse of small calibre with an automatic destruction device.
  • Fig. 6 is a view in cross section on the line VIVI of Fig. 5 with the parts in unarmed position.
  • Fig. 7 is a cross section on the line VII-VII of Fig. 5 with the parts in armed position.
  • the movement shown in Figs. 1 to 4 is applied in a general manner to all projectiles of large or average calibre.
  • the clockwork movement is formed by a balance wheel 30 pivoting on an arbor 30a the axis of which is concentric with that of the fuse.
  • the balance wheel (Fig. 3) is provided with a pallet 30b in engagement with an escapement wheel 31 secured to apinion 32 which meshes with a gear wheel 33.
  • the latter is secured to a pinion 34 meshing with the teeth 35 (Fig. 4) of a movable member formed by a mass 36 pivoted eccentrically at 36a relatively to the axis of the fuse.
  • the mass 36 is held in the unarmed position of the fuse, in the position shown in Fig.
  • the position of the centre of gravity of the mass 36 is so selected that it is located in the part of said mass included in the semicircle having as base diameter the line connecting the axis of rotation of the projectile to the pivotal axis 36a of the mass 36, and which, relatively to this line, is located on the side towards which the movable member moves when leaving its unarmed position, so that the mass 36 cannot move angularly at least during the greater portion of the period of angular acceleration of the projectile.
  • the movable safety member of the detonator is formed by a double armed lever 39 pivoted at its central portion on a pivot 40.
  • Said lever has at the end of one of its arms a hole in which is mounted the sensitive part 7 of the primer.
  • the distance between the pivot 40 and the axis of the fuse corresponds with that between the pivot 40 and the axis of the hole containing the sensitive part 7.
  • the lever 39 is unbalanced, that is to say that its centre of gravity is located outside its pivotal axis, on the side opposite the sensitive part 7, so that it tends quite naturally, under the action of centrifugal force, to assume the position shown in Fig. 4, the sensitive part 7 being then in the armed position, that is to say it establishes communication between the primer and the main charge.
  • the lever 39 is secured to a segment of a disc 41 having a notch 42, into which enters, in the position shown in Fig. 2; a circular shoulder of the mass 36, concentric to its axis of rotation 36a
  • the sensitive part 7 is located between the two plates of the movement and no communication is possible with the main charge of the projectile.
  • the circular shoulder of the mass 36 surrounding its axis of rotation has on the half thereof opposite the body of the mass 36 a cut-away portion 43 forming an escape for the segment 41, when the mass has moved, after the firing of the shot, up to the position shown in Fig. 4, in which it bears against a fixed stop 44.
  • a stop 45 is provided for the lever 39, when it is in its armed position (Fig. 4), in which it is locked by a centrifugal bolt 46.
  • the unbalancing of the lever' 39 is produced by a mass 47, for example of lead, located in a recess of its arm, opposite to that carrying the sensitive part 7.
  • the fuse F is provided with a striker 1 surrounded by a spring 1a, impact mechanism 1b and its support 10 the usual muzzle and transport safety devices and a self destruction device.
  • the safety device for "the muzzle and transport is formed 'by centrifugal bolts 20 retaining the striker 1 until the moment of firing the shot and then during the period of acceleration of the projectile in the muzzle.
  • the selfdestruction device is provided with a member 21 sliding in a support 22 and subjected to the action of the spring 1a, as also that of centrifugal masses 23. These masses slide in radial guides of the member 21 and co-operate under the action of centrifugal force with ramps of the support 22.
  • a clockwork movement comprising a mass 4 pivoting eccentrically at 5 relatively to the axis of the striker 1 and held in the unarmed position, shown in the drawing, by a spring 6.
  • the mass 4 contains the sensitive part 7 of the primer. In the position shown in Fig. 6, it will be seen that the striker cannot reach the sensitive part 7 located in the mass 4.
  • the position of the centre of gravity of the mass 4 is selected in such a manner that it cannot move angularly during the period of angular acceleration of the projectile.
  • the sensitive part 7 should produce the explosion of the detonating charge 2 by means of its cap 3 under the action of the striker when it is in its armed position (Fig. 7).
  • the sensitive part 7 is located at a distance from the axis 5 equal to the distance separating thisfrom the axis of the striker 1.
  • the mass 4 has teeth '8 concentric'to its pivotal axis 5. The teeth engage'with a pinion 9-of which the spindle 10 also carries at its upper end an escapement wheel 11 which co-operates with a balancer 12 pivoting on a spindle co-axial with that of the striker 1.
  • Such a device thus permits of obtaining, like the device describedwith reference to Figs. 1 to 4, in addition to the safety of the detonator, a safety over a definite distance in front of the muzzle. On this section of the trajectory the shell cannot therefore be fired by the fuse.
  • the centrifugal locking member 13 may be omitted.
  • the fuse is again rendered unarmed by the return rearwardly of the movable member 4, which return is produced by the spring 6.
  • the subject of the invention may naturally be applied to types of fuses other than that shown in the drawing, but it lends itself particularly to applications to fuses of small calibre, by reason of its small size.
  • a delayed arming ,fuse for a projectile comprising a movable member in the form of a mass pivotally mounted for movement under the action of centrifugal force about an axis eccentric with respect to the axis of the fuse, said member having a toothed rack segment thereon, a pinion meshing with said rack teeth, a clockwork escapement connected with said pinion for retarding the movement of said pinion and said member, the center of gravity of the movable member being located in the part of said member comprised in a semi-circle having as base diameter a line which connects the axis of rotation of the projectile to the pivotal axis of said movable member and which, relatively to said line, is located on the side to which the movable member moves from its unarmed position, and relative to said pivotal axis of the movable member is located on the side thereof so as to tend to move the movable member to its unarmed position during the period of angular acceleration of the projectile, a primer, means associated with said mov
  • a delayed arming fuse for a projectile comprising a movable member in the form of a mass pivotally mounted for movement under the action of centrifugal force about an axis eccentric with respect to the axis of the fuse, said member having a toothed rack segment thereon, a pinion meshing with'said rack teeth, a clockwork escapement connected with said pinion for retarding the movement of said pinion and said member, the center of-gravity of the movable member being located in the part'of said member comprised in a semi-circle having as base diameter a line which connects the axis of rot-ation'of the projectileto the pivotal axis of said movable member and which, relatively to said line, is located on the side to which the movable member moves from its unarmedposition, and relative to-said pivotal axis of the movable member is located on the side thereof so as to tend tomove the movable-member to its unarmed position during-the periodof angular acceleration of the projectile
  • a delayed arming fuse for a projectile comprising a movable member in the form of a mass pivotally mounted for movement under the actionof centrifugal force about an axis eccentric with respect to-the axis of the fuse, said member having a toothed rack segment thereon, a pinion meshing with said rack teeth, a clockwork escapement connected with said pinion for retarding the movement of said pinion and said member, a primer movable from anunarmed position to an armed position, a'disc' carrying said primer eccentrically thereof, and mounted for pivotal movement about an axis parallel to the axis oftheprojectile, a hub'carried by the movable member'engagingthe periphery of the disc for preventing rotation of the disc, said hub having a notch in a portion thereof operable in the :armed position of the movable memberfor freeing :the disc,z.the center of gravity ofvthe Q movable member being located in the part of said member comprised in a semi-circle having as

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
  • Toys (AREA)
  • Air Bags (AREA)
US249479A 1951-04-13 1951-10-03 Clockwork movement for a projectile Expired - Lifetime US2718850A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH700575X 1951-04-13

Publications (1)

Publication Number Publication Date
US2718850A true US2718850A (en) 1955-09-27

Family

ID=4529988

Family Applications (1)

Application Number Title Priority Date Filing Date
US249479A Expired - Lifetime US2718850A (en) 1951-04-13 1951-10-03 Clockwork movement for a projectile

Country Status (6)

Country Link
US (1) US2718850A (de)
BE (1) BE505659A (de)
DE (1) DE913754C (de)
FR (1) FR1051245A (de)
GB (1) GB700575A (de)
NL (1) NL101169C (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2825284A (en) * 1954-11-05 1958-03-04 Mefina Sa Impact fuzes with mechanical retardation
US2967483A (en) * 1955-01-31 1961-01-10 Junghans Helmut Shell fuze
US2991717A (en) * 1954-12-01 1961-07-11 Herman R Kollmeyer Grenade fuze
US3583319A (en) * 1969-03-20 1971-06-08 Hamilton Watch Co Delay arming mechanism
US3626853A (en) * 1970-02-27 1971-12-14 Honeywell Inc Multiple input arming mechanism
US3882782A (en) * 1971-10-11 1975-05-13 Mefina Sa Mechanically operated fuse for gyratory missiles
US4418621A (en) * 1980-04-01 1983-12-06 Mefina S.A. Mechanism for a rotating projectile fuze
US4430938A (en) * 1980-09-25 1984-02-14 Aktiebolaget Bofors Fuze safety device
US4464991A (en) * 1981-02-26 1984-08-14 Gebruder Junghans Gmbh Safety device for fuses of spinning projectiles
US4915028A (en) * 1988-05-16 1990-04-10 Werkzeugmaschinenfabrik Oerlikon-Buhrle Dud de-arming device or insert for a projectile fuze
US11512938B1 (en) * 2021-06-03 2022-11-29 Aura Technologies, Llc Centrifugal fuze assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL233649A (de) * 1958-07-25

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1561687A (en) * 1924-08-05 1925-11-17 Harold M Brayton Point-detonating fuse
GB397451A (en) * 1931-06-30 1933-08-24 Schneider & Cie Improvements in devices for delaying the arming of fuse mechanisms of projectiles
US2446545A (en) * 1945-04-17 1948-08-10 James F Mecaslin Delay arming device
US2448228A (en) * 1945-05-24 1948-08-31 Borg George W Corp Delay booster arming mechanism
US2457254A (en) * 1947-09-18 1948-12-28 Borg George W Corp Delay arming device for fuses
US2479851A (en) * 1947-05-06 1949-08-23 Borg George W Corp Delayed arming device for projectiles
US2531121A (en) * 1944-10-05 1950-11-21 Borg George W Corp Mechanical time fuse
US2541082A (en) * 1945-04-21 1951-02-13 James F Mccaslin Delay arming device for projectile fuses

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2089243A (en) * 1936-03-20 1937-08-10 Hermann H Zornig Fuse for bombs
NL51181C (de) * 1937-06-30

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1561687A (en) * 1924-08-05 1925-11-17 Harold M Brayton Point-detonating fuse
GB397451A (en) * 1931-06-30 1933-08-24 Schneider & Cie Improvements in devices for delaying the arming of fuse mechanisms of projectiles
US2531121A (en) * 1944-10-05 1950-11-21 Borg George W Corp Mechanical time fuse
US2446545A (en) * 1945-04-17 1948-08-10 James F Mecaslin Delay arming device
US2541082A (en) * 1945-04-21 1951-02-13 James F Mccaslin Delay arming device for projectile fuses
US2448228A (en) * 1945-05-24 1948-08-31 Borg George W Corp Delay booster arming mechanism
US2479851A (en) * 1947-05-06 1949-08-23 Borg George W Corp Delayed arming device for projectiles
US2457254A (en) * 1947-09-18 1948-12-28 Borg George W Corp Delay arming device for fuses

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2825284A (en) * 1954-11-05 1958-03-04 Mefina Sa Impact fuzes with mechanical retardation
US2991717A (en) * 1954-12-01 1961-07-11 Herman R Kollmeyer Grenade fuze
US2967483A (en) * 1955-01-31 1961-01-10 Junghans Helmut Shell fuze
US3583319A (en) * 1969-03-20 1971-06-08 Hamilton Watch Co Delay arming mechanism
US3626853A (en) * 1970-02-27 1971-12-14 Honeywell Inc Multiple input arming mechanism
US3882782A (en) * 1971-10-11 1975-05-13 Mefina Sa Mechanically operated fuse for gyratory missiles
US4418621A (en) * 1980-04-01 1983-12-06 Mefina S.A. Mechanism for a rotating projectile fuze
US4430938A (en) * 1980-09-25 1984-02-14 Aktiebolaget Bofors Fuze safety device
US4464991A (en) * 1981-02-26 1984-08-14 Gebruder Junghans Gmbh Safety device for fuses of spinning projectiles
US4915028A (en) * 1988-05-16 1990-04-10 Werkzeugmaschinenfabrik Oerlikon-Buhrle Dud de-arming device or insert for a projectile fuze
US11512938B1 (en) * 2021-06-03 2022-11-29 Aura Technologies, Llc Centrifugal fuze assembly
US20220390218A1 (en) * 2021-06-03 2022-12-08 Aura Technologies, Llc Centrifugal fuze assembly

Also Published As

Publication number Publication date
DE913754C (de) 1954-06-18
BE505659A (de)
FR1051245A (fr) 1954-01-14
NL101169C (de)
GB700575A (en) 1953-12-02

Similar Documents

Publication Publication Date Title
US2718850A (en) Clockwork movement for a projectile
US2664822A (en) Fuze
US2537953A (en) Powder train interrupter
AU2010212361B2 (en) Mechanical Command To Arm Fuze
US2900908A (en) Centrifugal safety device for a projectile fuze
US2155100A (en) Safety device for projectile fuses
US2446019A (en) Detonating or impact fuse
US2850979A (en) Time delay control means
US3670655A (en) Timing mechanism
US3505960A (en) Projectile fuse and projectiles equipped with said fuse
GB905963A (en) Improvements in or relating to fuzes for unrifled shells and other projectiles
US2626568A (en) Fuse
US3422764A (en) Rifled projectile fuze for practice projectiles
US3547034A (en) Mechanical time fuze
US2531121A (en) Mechanical time fuse
US3724384A (en) Centrifugally armed fuze
US4915028A (en) Dud de-arming device or insert for a projectile fuze
US3049999A (en) Hand grenade
US2335842A (en) Fuse
US3768415A (en) Fuze arming device
US3353489A (en) Impact fuze for a spinning projectile
US3451340A (en) Percussion fuze including rotary delay provisions
US3703866A (en) Delay arming mechanism
US2963974A (en) Impact detonating fuze with arming delay
US2943573A (en) Self destruction device