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US2192542A - Electric detonator - Google Patents

Electric detonator Download PDF

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Publication number
US2192542A
US2192542A US146305A US14630537A US2192542A US 2192542 A US2192542 A US 2192542A US 146305 A US146305 A US 146305A US 14630537 A US14630537 A US 14630537A US 2192542 A US2192542 A US 2192542A
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US
United States
Prior art keywords
spring
shaft
pinion
generator
magnet
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
US146305A
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English (en)
Inventor
Benedetti Giacomo De
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Individual
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Individual
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Filing date
Publication date
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Publication of US2192542A publication Critical patent/US2192542A/en
Anticipated expiration legal-status Critical
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q2/00—Lighters containing fuel, e.g. for cigarettes
    • F23Q2/28—Lighters characterised by electrical ignition of the fuel
    • F23Q2/285—Lighters characterised by electrical ignition of the fuel with spark ignition
    • F23Q2/287—Lighters characterised by electrical ignition of the fuel with spark ignition piezoelectric

Definitions

  • This invention relates to an electric detonator for mines or low speed projectiles provided in the body of the mine or projectile and in which the igniting spark is supplied by an electric our- 5 rent generator driven by a spring motor provided with means for winding it.
  • This spring mechanism is normally kept from unwinding, but a detent device is released upon mechanical shock to drive the generator.
  • Figure l is a longitudinal axial section of the detonator part that is essential to the inventiin.
  • Figure 2 is a sectional view of the inside of the bottom part taken on line II--II of Fig. 1.
  • Figure 3 is a sectional view of a delay device and a Figure 4 is a top view thereof.
  • the spring motor and electric current generator are arranged in the body i, which is subdivided by the plate 2 into two superposed chambers.
  • the top chamber contains the spring 3, one of the ends whereof is attached to the body i, while the other end is attached to a bush 6 loosely mounted on the shaft 5.
  • the lower end of the bush 6 is formed with saw teeth meshing with 'assoclated teeth on a ring 8 secured on the shaft 5.
  • the shaft 5 passes through the lower portion of the body i and the permanent magnet 9 in the shape of a cylinder. Underneath , the permanent magnet 9 the shaft 5 carries the coil it forming the rotor of the current generator, 40 while the stator is formed by the U-shaped pole pieces ll, E2 of the permanent magnet 9 merging with the two ends of the latter.
  • a pinion i3 is fixed to the lower end of the shaft 5 and meshes with the teeth id of a metal disc i5 having on one side a sector is of insulating material.
  • a contact Ii formed by a terminal for the feed current wipes on this side of the disc.
  • An end of the coil iii is electrically connected to the disc l5 through the shaft 5 and the pinion i3, and its other end is electrically connected to the second feed terminal i9 by means of a slip ring l9a. In its inoperative position the wiping contact I! engages the insulating sector it and the igniting circuit is 55 open.
  • this circuit breaking device is more particularly advantageous in submarine mines and the like having a plurality of detonators, the igniting circuits of which act upon one charge. It has been found that on impact of one of these detonators, a portion of the current generated is lost by induction in the lines of the other detonators, if these circuits are closed. This reduces the current available for forming the igniting spark and makes ignition uncertain, unless powerful current generators are employed, which would objectionably increase the size of the unit and cost of the detonator. The use of the breaking device it, i? obviates this drawback, as there are no closed circuits of the inoperative detonators.
  • the spring 8 is wound by means of a key fitted on the end 20 of the shaft 5.
  • the ratchet wheel 1 is mounted outside the body i at the top end-of the shaft 5 and a ratchet pawl B cooperates with said wheel to keep the spring from unwinding.
  • the pawl 8 may be released by a sudden mechanical shock and the spring 3 unwinds to rotate the rotor of the current generator.
  • the bushing i is coupled to the ring 6 by means of saw teeth so that the rotor may revolve after the spring 3 is fully unwound thus avoiding rupture of the spring as 'a result of the inertia of the revolving rotor.
  • the detonator When it is desired to produce ignition only a certain time after impact of the projectile, as is frequent in impact detonators, the detonator is provided with a delay device, for instance of the type shown in Figures 3 and 4.
  • the top portion of the body i carries a box 2! for the spring 3 having a toothed rim 22 which meshes with the pinion 23 of a winding-up device mounted on the shaft 24 projecting outwardly and carrying at its outer end the handle 25.
  • the pawl it prevents backward rotation of the pinion 23 and box 2
  • the mechanism cannot attain at once the speed required for igniting on account of the provision of the delay device.
  • the delay device shown by way of example consists chiefiy of a screw 36 on which a bush 35 fixed to the cover of the body 9 is screwed.
  • the screw 36 carries a pinion 36 having teeth of a substantial length.
  • the pinion 36$ meshes with a toothed wheel 37 mounted on the shaft 277 of the spring motor.
  • a toothed wheel 38 is fired to the screw 36 and meshes with a pinion controlling a damping wing 62.
  • the ignition delay depend upon the starting position of the pinion 36 with respect to the level of the toothed wheel 31. It is thus possible to adjust the delay by varying the initial position of the pinion 36.
  • a milled button 40 is provided on the dial 4
  • a device for use in detonating an .explosive charge comprising, an electric generatonfor producing a spark, a spiral spring connected to said generator for driving the same, hand-operated means for winding the driving spring, detent means to keep'said spring from unwinding and automatically operable means for releasing saiddetent means and a delay device for delaying the formation of the spark during rotation of the generator, this delay device comprising a braking member, a gear transmission between said braking member and the current generator, and.
  • a nut and screw mechanism one of the members of which is fixed and the other is coupled for rotation with one of the gears of said transmission in such manner as to bring it out of engagement after a certain time of rotation.
  • a device for use in detonating an explosive charge comprising, an electric generator for producing a spark, a spiral spring connected to said generator for driving the same, hand-operated means for winding the driving spring, detent means to keep said spring from unwinding and automatically operable means for releasing said detent means and a delay device for delaying the formation of the spark during rotation of the generator, this delay device comprising a braking member, a gear transmission between said braking member and the current generator, and a nut and screw mechanism, one of the members of which is fixed and the other is coupled for rotation with one of the gears of 1 said transmission in such manner as to bring it out of engagement after a certain time of rotation and hand-operated means for adjusting the initial position of the screw and nut mechanism and timing the delay action of said device.
  • a device for use in detonating an explosive charge comprising, an electric generator for producing a spark consisting 01' a stator constituted by a permanent magnet of cylindrical form, U-shaped pole pieces attached one at each end of said magnet and having their arms arranged at 90 to each other and extending from one end of said magnet, a rotor arranged between said projecting arms and a shaft for said rotor passing through an axial bore of said magnet, a spiral spring coaxially arranged on said magnet for driving said shaft, hand-operated means for winding said driving spring, detent means to keep said spring from. unwinding and means operable upon mechanical shock for releasing said detent means.
  • a device for use-in detonating an explosive charge comprising, a firing circuit, an electric generator for producing the spark current in said circuit, comprising a stator constituted by a permanent magnet of cylindrical form, U-shaped pole pieces attached at each end of said magnet and having their arms arranged at 90 ,t o each other and extending from the ends of v.s'aid magnet, a rotor arranged between said projecting arms and a shaft for said rotor passing through an axial bore of said magnet, a' spiral spring coaxially arranged on said magnet for driving said shaft, hand-operated means for winding said driving spring, detent means to keep said spring from unwinding, automatically operable means for releasing said detent means and a contact mechanism in said firing circuit and controlled by said shaft so that when the deviceis in its inoperative position it maintains said circuit open while and when the' spring unwinds to operate the generator, said contact mechanism closes said circuit and maintains itclosed as long as the driving spring is unwinding.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
US146305A 1936-06-03 1937-06-03 Electric detonator Expired - Lifetime US2192542A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT487544X 1936-06-03

Publications (1)

Publication Number Publication Date
US2192542A true US2192542A (en) 1940-03-05

Family

ID=11268398

Family Applications (1)

Application Number Title Priority Date Filing Date
US146305A Expired - Lifetime US2192542A (en) 1936-06-03 1937-06-03 Electric detonator

Country Status (5)

Country Link
US (1) US2192542A (hu)
BE (1) BE426372A (hu)
DE (1) DE706927C (hu)
FR (1) FR822973A (hu)
GB (1) GB487544A (hu)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2525817A (en) * 1945-05-31 1950-10-17 Macadams Jesse Edward Generator
US2563494A (en) * 1948-11-18 1951-08-07 Contacting device for controlling the igniting circuit of a main spring driven dynamoelectrical igniting device
US2870841A (en) * 1952-07-25 1959-01-27 Baker Oil Tools Inc Apparatus for operating subsurface well devices
US2924721A (en) * 1957-04-04 1960-02-09 Wasag Chemie Ag Fa Clockwork-operated detonators
US2935950A (en) * 1944-05-13 1960-05-10 William B Mclean Release mechanism
US3175496A (en) * 1961-11-30 1965-03-30 Rochat Jean Electric firing device for projectiles
US3342998A (en) * 1965-04-01 1967-09-19 Fidelity Electric Company Inc Spring-driven electrical generator
US3844215A (en) * 1960-04-13 1974-10-29 Us Army Mine fuze
US20230175820A1 (en) * 2021-12-07 2023-06-08 Southwest Research Institute Electrical igniter assembly for incendiary and explosive devices

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2434551A (en) * 1943-08-11 1948-01-13 Eliomarkakis Panayottis John Magnetic fuse

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2935950A (en) * 1944-05-13 1960-05-10 William B Mclean Release mechanism
US2525817A (en) * 1945-05-31 1950-10-17 Macadams Jesse Edward Generator
US2563494A (en) * 1948-11-18 1951-08-07 Contacting device for controlling the igniting circuit of a main spring driven dynamoelectrical igniting device
US2870841A (en) * 1952-07-25 1959-01-27 Baker Oil Tools Inc Apparatus for operating subsurface well devices
US2924721A (en) * 1957-04-04 1960-02-09 Wasag Chemie Ag Fa Clockwork-operated detonators
US3844215A (en) * 1960-04-13 1974-10-29 Us Army Mine fuze
US3175496A (en) * 1961-11-30 1965-03-30 Rochat Jean Electric firing device for projectiles
US3342998A (en) * 1965-04-01 1967-09-19 Fidelity Electric Company Inc Spring-driven electrical generator
US20230175820A1 (en) * 2021-12-07 2023-06-08 Southwest Research Institute Electrical igniter assembly for incendiary and explosive devices
US11692798B2 (en) * 2021-12-07 2023-07-04 Southwest Research Institute Electrical igniter assembly for incendiary and explosive devices

Also Published As

Publication number Publication date
GB487544A (en) 1938-06-22
FR822973A (fr) 1938-01-11
BE426372A (hu) 1938-03-31
DE706927C (de) 1941-06-09

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