US3175496A - Electric firing device for projectiles - Google Patents

Electric firing device for projectiles Download PDF

Info

Publication number
US3175496A
US3175496A US247783A US24778362A US3175496A US 3175496 A US3175496 A US 3175496A US 247783 A US247783 A US 247783A US 24778362 A US24778362 A US 24778362A US 3175496 A US3175496 A US 3175496A
Authority
US
United States
Prior art keywords
acceleration
arm
disc
projectiles
spring
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
US247783A
Other languages
English (en)
Inventor
Rochat Jean
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US3175496A publication Critical patent/US3175496A/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
    • F42C11/00—Electric fuzes
    • F42C11/04—Electric fuzes with current induction

Definitions

  • An object of the present invention is to avoid all danger of premature igniting of projectiles of this type.
  • a firing electric device for projectiles comprises an electric generator, a part of the magnetic circuit of which is displaceable under spring infiuence to produce the electric energy necessary to fire the projectile, this part of the magnetic circuit being maintained in position, before discharge, by a locking or holding device sensitive to the acceleration of the projectile, this locking device comprising an inertia mass displaceable against the action of a spring and against the action of a retarding device, characterised in that the locking device also comprises a brake preventing the unlocking when the acceleration of the projectile exceeds a predetermined acceleration.
  • FIG. 1 is a plan view of the device constructed in accordance with the invention.
  • FIG. 2 is an elevation after removal of the generator
  • FIG. 3 is a section through a part of the locking mechanism of an electric generator before tripping
  • FIG. 4 is a section similar to FIG. 3 of the locking mechanism after tripping.
  • FIG. 5 is a constructional detail.
  • the firing device shown comprises a base plate 1 of insulating material and carrying a generator 2 and means for controlling the energization thereof to fire the projectile at selected degrees of acceleration.
  • the generator 2 has not been shown in detail as it is constructed in accordance with known electric motor principles comprising a rotor constituted by a permanent magnet.
  • This rotor is disposed between two pole shoes 3 and 4 of a magnetic circuit having a winding 5.
  • This rotor is rotatably integral with a disc '6 presenting two diametrically opposed slots 7, the disc 6 being influenced by a spring 8 hooked to a fixed member 9.
  • the disc 3,175,496 Patented Mar. 30, 1965 6 is prevented from turning under the influence of the spring 8 by a finger 10 engaged in a slot 7.
  • This finger 10 forms part of a lever 11 suspended from the shank of a screw type stud 12 on a supporting block 13 fixed to the plate 14 which constitutes a part of the frame for housing the means for retarding the mechanism as the projectile is in flight.
  • the lower end of the lever 11, which for convenience may be termed the first lever, cooperates With the end of a second lever 15 pivoted at its other end on the shank of a screw type stud 16 fitted into the block 13, said stud 16 having its axis disposed at right angles to the axis of the stud 12.
  • the plate 14 is connected by spacer members 17, 1S and 19 to second plate 21).
  • An axle 21 of which a part 22, of larger diameter passes through the plate 14, is mounted between these two plates and serves to support an arm 23, which carries a weight 24.
  • the axle 21 carries, between the plates 14 and 20, a toothed segment 25 which meshes with a pinion 26 of a multiplying gear train.
  • This train comprises a toothed wheel 27 in mesh with a pinion 28 rotatably integral with a disc 29 of conductive material the periphery of which passes in an air gap located between a bent sheet 30 and a permanent magnet 31.
  • the arm 23 carrying the weight 24 is maintained, in the stationary state, in the position shown in FIG. 2 by spring 32 fixed to the base plate 1 (FIG. 2). In this position, as is shown in FIG. 3, the arm 23 lies against a first abutment or keeper notch 43 of the lever 15 which also has a second abutment or keeper notch 35 as will be seen from FIG. 3.
  • the device shown is fixed in a projectile in such a manner that the longitudinal axis of the projectile is perpendicular to the base plate 1, the nose of the projectile being above the base plate 1, with reference to FIG. 2.
  • the inertia forces acting on the weight 24 and on the arm 23 at the moment of discharge of the projectile have the effect of turning the arm 23 around its axle 21 against the action of the spring 32.
  • the spacer 17, which separates the plates 14 and 20, carries a leaf spring 34, the free end of which is near the edge of the disc 29.
  • the lever 15 presents a slot 35 which is visible in FIG. 3.
  • This device opposes the movement of the arm 23 by virtue of the kinetic energy which must be accumulated in the moving members, especially in the disc 29 and, as a result of the braking effected by the Foucalt currents which are generated in the disc 29 as a result of its rotation in a magnetic field produced by the magnet 31.
  • the rotation of the arm 23 carries on until it comes to position opposite the second abutment or keeper notch 35 of the lever 15, so that lever 15 can pivot to take up the position shown in FIG. 4, its end thus freeing the end of the lever 11.
  • the lever 11 can then pivot around its screw 12 in a counterclockwise direction, with reference to FIG. 2, under the influence of a force exerted on the finger 10 by the edge of the slot 7 by the disc 6 which is influenced by the spring 8.
  • the finger describes the arc of a circle and moves away from the upper face of the disc 6, so that this disc 6 is freed and can turn under the influence of the spring 8.
  • the current produced by the generator 2 is used for charging a condenser (not shown) which permits, in known manner, the ignition of an explosive charge at the moment when it is desired.
  • the torque exerted on the lever 11 by the disc 6 when it is locked tends to pivot the lever 11 in a counterclockwise direction, which applies its oblique surface 36 against that of the lever 15, the torque exerted on this lever 15 by this reaction application tends to turn the lever 15 in a counterclockwise direction with reference to FIGS. 3 and 4.
  • the arm 23 can turn against the action of the spring 32.
  • the duration of the acceleration being too short to permit the rotation of this arm to turn sufficiently to effect the disengagement of the locking device, the spring 32 brings back the arm into the position shown in FIG. 2 as soon as the acceleration has ceased.
  • the projectile is to be submitted to a very great acceleration, for example five times as great as the normal acceleration of the discharge of the projectile, there could be feared that in spite of the short duration of this acceleration, the arm 23 would turn sufficiently to induce the arming of the firing device.
  • a firing device for projectiles comprising,
  • retarding means for controlling said generator also on said base including, a member swingable relative to the plane of said base about an axle mounted in said frame and connected to multiplying gearing and a disc driven by said mechanism and whose periphery moves in the field of a permanent magnet,
  • a firing device according to claim 1, wherein the means maintaining said member poised also includes a pair of levers frictionally engaged at their free ends, one of said levers having first and second spaced keeper notches, the first notch normally receiving the arm to maintain it poised for a predetermined period of acceleration, and
  • a firing device for projectiles comprising,
  • means for controlling said generator including,
  • an arm having a weight at one end and pivotally connected at the other end to retarding mechanism including gearing connected with said arm operating a disc whose periphery is in the field of a permanent magnet,
  • levers frictionally engaged at their free ends, one of said levers having an offset arm for engaging a notch in the disc and the other lever having s aced first and second keeper notches, the first notch normally receiving the arm to maintain it poised for a predetermined initial period of acceleration, and when the duration of the period of acceleration exceeds the predetermined initial setting, said arm will be further turned until it rests in the second keeper notch.
  • An electric firing device for projectiles comprising,
  • an electric generator mounted on a base and including a rotor having a winding, pole pieces and a fixed memher,
  • a spring having one end secured to the base and its free end engaging in maintaining said arm in a normally predetermined elevated position
  • said means comprising,
  • a multiplying gear train connected with the said axle of said arm and including a disc having its periphery portion operating in the field of a permanent magnet
  • first lever having first and second spaced keeper notches in one edge and pivotally supported on a pivot at its upper end on said frame, said arm normally resting in said first notch
  • a second lever supported at its upper end on said frame by a pivot disposed at right angles to said pivot, said lever having an angularly offset portion engageable with a related notch of the disc,

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Toys (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US247783A 1961-11-30 1962-11-26 Electric firing device for projectiles Expired - Lifetime US3175496A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1393961A CH373985A (fr) 1961-11-30 1961-11-30 Dispositif d'allumage électrique pour projectile

Publications (1)

Publication Number Publication Date
US3175496A true US3175496A (en) 1965-03-30

Family

ID=4396636

Family Applications (1)

Application Number Title Priority Date Filing Date
US247783A Expired - Lifetime US3175496A (en) 1961-11-30 1962-11-26 Electric firing device for projectiles

Country Status (6)

Country Link
US (1) US3175496A (fr)
CH (1) CH373985A (fr)
DE (1) DE1172994B (fr)
ES (1) ES282688A1 (fr)
FR (1) FR1339232A (fr)
GB (1) GB1021225A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3295449A (en) * 1963-10-15 1967-01-03 Diehl Fa Electrical fuses for projectile or the like

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2192542A (en) * 1936-06-03 1940-03-05 Benedetti Giacomo De Electric detonator
US2642801A (en) * 1947-06-09 1953-06-23 Us Sec War Acceleration switch delayed arming fuse
US2918007A (en) * 1953-08-31 1959-12-22 Motha Treuinstitut Electric ignition devices for projectiles

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB572791A (en) * 1941-12-18 1945-10-24 Allen West & Co Ltd Improvements in or relating to delaying mechanisms for use on projectiles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2192542A (en) * 1936-06-03 1940-03-05 Benedetti Giacomo De Electric detonator
US2642801A (en) * 1947-06-09 1953-06-23 Us Sec War Acceleration switch delayed arming fuse
US2918007A (en) * 1953-08-31 1959-12-22 Motha Treuinstitut Electric ignition devices for projectiles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3295449A (en) * 1963-10-15 1967-01-03 Diehl Fa Electrical fuses for projectile or the like

Also Published As

Publication number Publication date
DE1172994B (de) 1964-06-25
ES282688A1 (es) 1963-02-01
CH373985A (fr) 1963-12-15
FR1339232A (fr) 1963-10-04
GB1021225A (en) 1966-03-02

Similar Documents

Publication Publication Date Title
US2537953A (en) Powder train interrupter
US3175496A (en) Electric firing device for projectiles
US3425353A (en) Arming and safety mechanism for a drag chute retarded bomb
US2718850A (en) Clockwork movement for a projectile
GB1311219A (en) Fuse for a gyratory rocket missile including a safety device
US2850979A (en) Time delay control means
US3724384A (en) Centrifugally armed fuze
US3450049A (en) Underwater delay fuze
US3416894A (en) Setback responsive arming device
US3768415A (en) Fuze arming device
US4550661A (en) Safety device for ammunition
US3978798A (en) Fuze mechanism having integrated safety functions
US3703866A (en) Delay arming mechanism
US3170404A (en) Acceleration sensitive variable clock
GB1348756A (en) Mechanically operated fuse for gyratory missiles
US2966857A (en) Electric fuze. magnetic impulse generator
US3614930A (en) Rate change devices and particularly improved arming devices
US3734023A (en) Fuse for the safe and precise detonation of explosive projectiles
US3125958A (en) A foure
US3616756A (en) Time fuze for projectiles
US2943573A (en) Self destruction device
US3587469A (en) Centrifugally armed ordnance fuze
US2458474A (en) Centrifugally operated control device
US3285177A (en) Dual function fuzes
US3768407A (en) Anti-disturbance delay fuze