US3814018A - Safety device for percussion fuse - Google Patents

Safety device for percussion fuse Download PDF

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Publication number
US3814018A
US3814018A US00111658A US11165871A US3814018A US 3814018 A US3814018 A US 3814018A US 00111658 A US00111658 A US 00111658A US 11165871 A US11165871 A US 11165871A US 3814018 A US3814018 A US 3814018A
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United States
Prior art keywords
primary
fuse
parts
recess
interlocking
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Expired - Lifetime
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US00111658A
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English (en)
Inventor
A Daniel
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Etat Francais
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Etat Francais
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Publication date
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Publication of US3814018A publication Critical patent/US3814018A/en
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    • 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

Definitions

  • ABSTRACT locked in an extreme position toward the back of the fuse before missile discharge.
  • the device has a primary part which is initially locked in a position to the front of the fuse and a second part which can slide relative to the first one.
  • An interlock is provided between the primary and second parts and provision is made for disengaging these parts when the primary part is frontward in the fuse.
  • a third part is provided which is capable of sliding relative to the second part.
  • An interlock couples the second and third parts but provides for disengaging them after the second part has been disengaged from the primary part.
  • a percussion device associated with the third part effects the operation of the fuse during the frontward movement of the third part after disengagement thereof from the sec- 0nd part.
  • the present invention allows the achieving of the aforegoing objects by preventing the priming of the explosive charge of a missile, whether rotating or not, even if the missile motion comprises a comparatively low-amplitude deceleration phase after take-off.
  • the first portion of an arming drill operates, the second portion coming into operation when the deceleration has reached a very low value.
  • Another object of the invention is to produce a safety device for inertial fuses by the use of comparatively inexpensive and dependable mechanical means.
  • a fuse safety device that can slide in an axial or appreciably axial direction inside a seating in the said fuse, wherein the device can be locked in an end position toward the back of the fuse before the firing of the missile.
  • This device comprises: a seating, 21 primary part slidable in said seating; a second part able to slide in relation to the primary part; means for allowing the same to interlock the said primary and second parts and to disengage when the primary part comes to the front of the fuse; means for enabling the locking of the primary part in the front position after the disengagement and return of the second part to the rear of the fuse; a third part sliding in relation to the second part; means for interlocking the said second and third parts and for disengaging them after the second part has been disengaged from the primary part; and a percussion device combined with the third part and bringing the fuse into operation when the frontward movement of the said third part takes place after disengagement with the second part.
  • Another object of theinvention is to provide a device, as described above, wherein the means for locking the first part in its front position and the means for disengaging the first and second parts come into effect through a'single means that can occupy two different positions, due to two series of recesses carried respectively by the second part and by the side wall of the seating of the device, and due also to hollows machined in the primary part.
  • the said single means is made up of spheres of tough material and the recesses machined in the second part comprise a portion inclined to the axis frontward of the fuse to facilitate the clearing of the said spheres in the position of disengagement for the primary and second parts.
  • the means for interlocking and the means for disengaging the second and third parts are achieved by a single means that can occupy two different positions because of recesses machined in the third part and hollows machined in the second part, the said disengagement being obtained by means of a spring.
  • the said single means is composed of spheres of tough material and the recesses machined in the third part comprise an inclined portion to facilitate the clearing of the said spheres in the position of disengagement for the second and third parts.
  • certain shiftings of the various parts can be effected by means other than inertial operation, for example, by means comprising countersprings, time-lag mechanisms or devices sensitive to the rotation of the missile.
  • FIG. 1 is a sectional view of a device according to the invention in its position of rest;
  • FIG. 2 is a corresponding sectional view of the same device in the position it assumes immediately after the missile take-off;
  • FIG. 3 is a corresponding sectional view of the same device in the last phase of the arming sequence.
  • a primary part called the outside part 8 can be seen on the inside of a cylindrical seating 4.
  • Part 8 is able to slide inside seating 4 and is furnished also with hollow or openings 7' each containing a small metal sphere 7 of a diameter greater than the thickness of part 8.
  • the outside part 8 can be locked (FIG. 1) at the back of the fuse by means of stop pins 5. It can also be locked at the front of the fuse (FIG. 3) when the balls 7 partially enter into recesses 6 provided in the wall of seating 4.
  • a second part 2, called the center bit, is in the form of a hollow cylinder and can slide relatively to part 8.
  • Part 2 comprises, on the one hand, some cam-shaped recesses 2T workingin conjuction with the balls 7 and, on the other hand, hollow or openings 9' each holding a metal ball 9'.
  • Recesses 6 have a depth exceeding that of recesses 2' to permit clearance of spheres 7.
  • Part 8 has a thickness exceeding the depth of recess 3' to permit clearance of spheres 9 when the part 8 clears the recess 3.
  • a bolster In front of center bit 2, a bolster accommodates a spring 1 which is further supported on the wall in front of seating 4.
  • a third part called the inside part, carries the percussion mechanism 12.
  • This part is equipped with the cam-shaped circular grooved recess 3' toward its rearmost end and can slide in the center bit 2.
  • the circular recess working with the openings 9 of the center bit 2 and with balls 9 interlocks the two parts 2 and 3 during the first stage of the arming sequence.
  • the arming process is as follows:
  • Second stage missile take-off after clearing the pins 55 take-off deceleration, even though small compresses spring 1 and all of the three parts 2,3 and 8 are shifted as a unit frontward relative to seating 4;
  • the percussion device is then in operating-position, to procure percussion on impact of the missile.
  • a safety device adapted to slide toward the front and back of a fuse inside a seating in said fuse and adapted for being locked in an extreme position toward the back of the said fuse before discharge of a missile including said fuse, said device comprising: a primary part slidable in said seating from the back to the front of the fuse, means to hold said primary part in said extreme position and controllable to release said primary part to slide to the front, a second part adapted for slding relative to the primary part; first interlocking means for interlocking the said primary and second parts and enabling the same to disengage when the primary part moves toward the front of the fuse; means enabling the locking of the primary part in the front position after the disengagement and return of the second part to the rear of the fuse, a third part adapted for sliding relative to the second part; second interlocking means for interlocking the said second and third parts and enabling the same to disengage after the second part has been disengaged from the primary part; and a percussion device operatively associated with the third part and effecting
  • a device wherein the means for locking the primary part in the front position and the first interlocking means for interlocking the primary and second parts cooperatively include a single means adapted to occupy two distinct positions, for cooperation with two recesses respectively provided in said second part and said seating, said single means being carried in an opening provided in the primary part.
  • the second interlocking means for interlocking the second and third parts cooperatively include a single means adapted to occupy two distinct positions for selective cooperation with a recess provided in the third part, said single means being carried in an opening provided in the second part, said device further including a spring for urging the second part toward the rear of the fuse.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Toys (AREA)
US00111658A 1970-04-22 1971-02-01 Safety device for percussion fuse Expired - Lifetime US3814018A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7014529A FR2199862A5 (de) 1970-04-22 1970-04-22

Publications (1)

Publication Number Publication Date
US3814018A true US3814018A (en) 1974-06-04

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ID=9054358

Family Applications (1)

Application Number Title Priority Date Filing Date
US00111658A Expired - Lifetime US3814018A (en) 1970-04-22 1971-02-01 Safety device for percussion fuse

Country Status (4)

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US (1) US3814018A (de)
DE (1) DE2119574A1 (de)
FR (1) FR2199862A5 (de)
GB (1) GB1347314A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4004520A (en) * 1973-04-10 1977-01-25 Mefina S.A. Time fuse
US4217828A (en) * 1977-09-09 1980-08-19 S.A. Prb, Societe Anonyme Safety device for fuses
US4632033A (en) * 1984-06-11 1986-12-30 The State Of Israel, Ministry Of Defence, Israel Military Industries Detonator for rifle grenades or the like
US20080041262A1 (en) * 2006-08-02 2008-02-21 Rastegar Jahangir S Mechanical delay mechanisms for inertial igniters for thermal batteries and the like
US20080110365A1 (en) * 2006-11-15 2008-05-15 Rastegar Jahangir S Axially compact mechanical igniter for thermal batteries and the like
US20090151585A1 (en) * 2007-12-15 2009-06-18 Junghans Microtec Gmbh Safety and Arming Unit for a Fuze of a Projectile
US20100071577A1 (en) * 2008-09-21 2010-03-25 Omnitek Partners Llc Axially compact and low-volume mechanical igniter for thermal batteries and the like
US20140076185A1 (en) * 2012-09-16 2014-03-20 Jahangir S. Rastegar Compact and Low-Volume Mechanical Igniter and Ignition Systems with Safing Arm and Arming Pin for Thermal Batteries and the Like

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3912355A1 (de) * 1989-04-14 1990-11-29 Nico Pyrotechnik Zuender fuer kleine fallwirkkoerper, vorzugsweise uebungs-bomblets
DE4242891A1 (de) * 1992-12-18 1994-06-23 Dynamit Nobel Ag Vorrohr-Sicherheitszünder und mit diesem ausgestattetes Geschoß

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2243621A (en) * 1936-12-31 1941-05-27 Sageb Sa Percussion fuse for projectiles
US2872868A (en) * 1955-07-11 1959-02-10 Jr William J Donahue Missile nose fuze
US3557701A (en) * 1969-02-05 1971-01-26 Forsvarets Fabriksverk Hand-grenade fuze

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2243621A (en) * 1936-12-31 1941-05-27 Sageb Sa Percussion fuse for projectiles
US2872868A (en) * 1955-07-11 1959-02-10 Jr William J Donahue Missile nose fuze
US3557701A (en) * 1969-02-05 1971-01-26 Forsvarets Fabriksverk Hand-grenade fuze

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4004520A (en) * 1973-04-10 1977-01-25 Mefina S.A. Time fuse
US4217828A (en) * 1977-09-09 1980-08-19 S.A. Prb, Societe Anonyme Safety device for fuses
US4632033A (en) * 1984-06-11 1986-12-30 The State Of Israel, Ministry Of Defence, Israel Military Industries Detonator for rifle grenades or the like
US7587980B2 (en) * 2006-08-02 2009-09-15 Omnitek Partners Llc Mechanical delay mechanisms for inertial igniters for thermal batteries and the like
US20080041262A1 (en) * 2006-08-02 2008-02-21 Rastegar Jahangir S Mechanical delay mechanisms for inertial igniters for thermal batteries and the like
US20080110365A1 (en) * 2006-11-15 2008-05-15 Rastegar Jahangir S Axially compact mechanical igniter for thermal batteries and the like
US7437995B2 (en) * 2006-11-15 2008-10-21 Omnitek Partners Llc Axially compact mechanical igniter for thermal batteries and the like
US20090151585A1 (en) * 2007-12-15 2009-06-18 Junghans Microtec Gmbh Safety and Arming Unit for a Fuze of a Projectile
US7980179B2 (en) * 2007-12-15 2011-07-19 Junghans Microtec Gmbh Safety and arming unit for a fuze of a projectile
US20100071577A1 (en) * 2008-09-21 2010-03-25 Omnitek Partners Llc Axially compact and low-volume mechanical igniter for thermal batteries and the like
US7832335B2 (en) * 2008-09-21 2010-11-16 Omnitek Partners Llc Axially compact and low-volume mechanical igniter for thermal batteries and the like
US20140076185A1 (en) * 2012-09-16 2014-03-20 Jahangir S. Rastegar Compact and Low-Volume Mechanical Igniter and Ignition Systems with Safing Arm and Arming Pin for Thermal Batteries and the Like
US9435623B2 (en) * 2012-09-16 2016-09-06 Omnitek Partners Llc Compact and low-volume mechanical igniter and ignition systems with safing arm and arming pin for thermal batteries and the like

Also Published As

Publication number Publication date
FR2199862A5 (de) 1974-04-12
GB1347314A (en) 1974-02-27
DE2119574A1 (de) 1975-02-13

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