US3783791A - Switch for electrical impact detonators - Google Patents

Switch for electrical impact detonators Download PDF

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Publication number
US3783791A
US3783791A US00188953A US3783791DA US3783791A US 3783791 A US3783791 A US 3783791A US 00188953 A US00188953 A US 00188953A US 3783791D A US3783791D A US 3783791DA US 3783791 A US3783791 A US 3783791A
Authority
US
United States
Prior art keywords
switch
contact member
housing
spring
contact
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
US00188953A
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English (en)
Inventor
G Backstein
L Petzsch
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.)
Rheinmetall Industrie AG
Original Assignee
Rheinmetall GmbH
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
Priority claimed from DE19702054839 external-priority patent/DE2054839C3/de
Application filed by Rheinmetall GmbH filed Critical Rheinmetall GmbH
Application granted granted Critical
Publication of US3783791A publication Critical patent/US3783791A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/14—Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00—Details of fuzes
    • F42C19/06—Electric contact parts specially adapted for use with electric fuzes

Definitions

  • H01h 35/14 movement therein- A p g acts in a direction against 58 Field of Search 102/70.2 R, 70.2 GA; the firing direction and retaining the contact member 200/5145 R 6152 in resting position, and the contact member has the greatest possible mass relative to the external dimen- 5 R fe Cited sions of the housing.
  • the present invention relates to a switch for electrical impact detonators, which switch has an inertial mass operating as a contact member, which is mounted for axial and tilting movements in a housing forming a complementary or co-operating contact and which is held in rest position by a spring force effective against the firing direction.
  • Such switches are intended for use in impact detonators of projectiles with or without spinning movement, and are supposed to bring about safe detonation with axial and/or lateral impact on the target.
  • Such switches are generally arranged in the projectile nose, and it is therefore an essential requirement, to keep the dimensions of the switch as small as possible. This complicates however the achievement of the further requirement, namely that of high switch sensitivity.
  • a switch which has a spherical inertial mass as a contact member.
  • the sphere is retained in a ring-shaped bearing seating by aspring effective against the firing direction and is enclosed by a semispherical switch housing forming a complementary or co-operating contact. Due to this form of construction, only a comparatively small mass is available for the spherical contact member with a relatively small mass, in relation with the external dimensions of the switch housing, whereby limits are provided to the sensitivity of the switch.
  • the contact member as an inertial mass having the greatest possible mass relative to the outer dimensions of the housing enclosing the contact member.
  • the contact member is designed as a substantially cylindrical body, the length of which corresponds at least approximately to its diameter.
  • a contact member with a comparatively large mass is obtained with a switch housing, whose external dimensions are limited both in length as well as in diameter.
  • a particularly favorable construction of the switch is obtained in relation to its external dimensions and the obtainable mass of the contact member results, if the switch housing forming the co-operating contact is formed by the projectile casing or its nose.
  • the arrangement is such, that the force of the spring holding the contact member in the installed rest position is adjustable.
  • the spring may be secured appropriately between two axially-movable bushes, of which one abuts against the contact member and the other abuts against a complementary bearing located in the housing and axially adjustable.
  • FIGURE is an axial section of the switch designed in accordance with the present invention.
  • a projectile nose comprises of housing parts la and 1b, which are inserted in a head 2 of a projectile, shown in dot-dash lines.
  • the projectile nose forms simultaneously a housing for the switch of an electrical impact detonator (not shown) located inside the projectile.
  • a contact bolt 4 surrounded by an insulation sleeve 3 is located in the housing part llb.
  • the front housing part la has a cylindrical recess 6 and surrounds the contact member 5 with slight clearance.
  • the housing part 1a forms the co-operating or complementary contact of the switch.
  • the contact member 5 In the resting position, the contact member 5 is retained by a coil spring 7, which is clamped between two insulating bushes 8 and 9 mounted to move axially.
  • One bush is spherical at its end pointing towards the contact member 5 and is supported in a conical centering bore 10 in the front face of the contact member 5.
  • the other bush 9 engages against a complementary bearing in the form of a threaded socket 11, which is adjustable axially and which is located in the projectile nose in an axial screwthreaded bore 12.
  • the bore 12 is closed by a screw 13 inserted in the projectile nose, which screw 13 has a shank 14 for guiding the bushes 8 and 9.
  • a centering and contact pin 16 loaded by a spring 15, whose front end projecting from the contact bolt 4 enters for forcible and intimate engagement in a conical centering bore 17 of the contact member 5.
  • the tension of the coil spring 7 can be altered by rotating the threaded socket 11. This can be carried out either by a screw driver or possibly simultaneously by a measuring device for measuring the spring tension. This tool can be guided by the central bore 18 of the threaded socket 11 against the bush 9, which is longitudinally displaceable in the threaded socket 111. In this manner, an extraordinarily accurate fine adjustment of the sensitivity of the switch is possible.
  • the contact member 5 moves forward as a result of the thrust imparted to it during the flight, whereby the electrical contact with the contact bolt 41 remains in force by the spring-loaded contact pin 16. Now, as soon as the contact member 5 comes into contact with the surrounding wall of the re cess 6 forming the co-operating contact, the impact detonator is triggered. This also occurs, in the case of a lateral striking of a target by the projectile. In this case, the contact member 5 tilts about the edge of its contact surface and comes into contact with the housing wall in the same way.
  • Electrical impact detonators are provided in known manner with capacitors, and the like, which make the detonators live only after a certain time interval, in
  • the masking safety characteristic If, within this distance, the projectile hits an object, then the switch is actuated in the aforedescribed manner, but no detonation occurs. Therefore, the contact member is guided back into its rest position by the bush 8 acted upon by the spring 7, aided by the spherical support face of the bush 8 engaging the conical centering bore 10.
  • a switch for electrical impact detonators comprismg an inertial mass effective as a contact member
  • a housing having a recess forming a complementary contact and substantially complementarily surrounding said contact member, the latter being disposed movably therein for axial as well as laterally tiltable movement relative thereto,
  • said contact member being substantially as large as said recess complementarily disposed in said recess and minimally spaced from said housing to permit actuation from axial as well as laterally tiltable movement relative thereto,
  • said contact member comprises a substantially cylindrical body having an axial length corresponding at least approximately with its diameter.
  • the switch as set forth in claim 1, which includes means for adjusting the tension of said spring.
  • the switch as set forth in claim 4, which includes a measuring device for measuring the tension of said spring, and
  • said member has an axial bore for insertion of said measuring device in said housing.
  • a switch disposed in said projectile nose and operating said electrical impact detonator.
  • said contact member comprises a'substantially cylindrical body having an axial length corresponding at least approximately with its diameter
  • said housing forming said complementary contact comprises a projectile nose
  • a switch disposed in said projectile nose and operating said electrical impact detonator.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Air Bags (AREA)
US00188953A 1970-11-07 1971-10-13 Switch for electrical impact detonators Expired - Lifetime US3783791A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702054839 DE2054839C3 (de) 1970-11-07 Schalter für elektrische Aufschlagzünder

Publications (1)

Publication Number Publication Date
US3783791A true US3783791A (en) 1974-01-08

Family

ID=5787439

Family Applications (1)

Application Number Title Priority Date Filing Date
US00188953A Expired - Lifetime US3783791A (en) 1970-11-07 1971-10-13 Switch for electrical impact detonators

Country Status (6)

Country Link
US (1) US3783791A (fr)
BE (1) BE775027A (fr)
CH (1) CH537569A (fr)
FR (1) FR2113184A5 (fr)
GB (1) GB1361862A (fr)
NL (1) NL7113085A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2305709A1 (fr) * 1975-03-26 1976-10-22 Philips Nv Contact d'impact pour projectiles
US5271329A (en) * 1991-01-09 1993-12-21 Giat Industries Impact contactor particularly for projectiles with an explosive charge
US7614345B1 (en) * 2005-06-27 2009-11-10 The United States Of America As Represented By The Department Of The Navy Impact switch

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3118989A (en) * 1962-01-31 1964-01-21 Gray Reginald Ivan Coaxial relay
US3158705A (en) * 1962-12-04 1964-11-24 Robert W Bliss Combination graze and impact switch
US3657499A (en) * 1969-08-01 1972-04-18 Dynamit Nobel Ag Vibration-sensitive electric switch

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3118989A (en) * 1962-01-31 1964-01-21 Gray Reginald Ivan Coaxial relay
US3158705A (en) * 1962-12-04 1964-11-24 Robert W Bliss Combination graze and impact switch
US3657499A (en) * 1969-08-01 1972-04-18 Dynamit Nobel Ag Vibration-sensitive electric switch

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2305709A1 (fr) * 1975-03-26 1976-10-22 Philips Nv Contact d'impact pour projectiles
US4036143A (en) * 1975-03-26 1977-07-19 U.S. Philips Corporation Impact contact device for projectiles
US5271329A (en) * 1991-01-09 1993-12-21 Giat Industries Impact contactor particularly for projectiles with an explosive charge
US7614345B1 (en) * 2005-06-27 2009-11-10 The United States Of America As Represented By The Department Of The Navy Impact switch

Also Published As

Publication number Publication date
BE775027A (fr) 1972-03-01
NL7113085A (fr) 1972-05-09
DE2054839B2 (de) 1976-03-25
FR2113184A5 (fr) 1972-06-23
GB1361862A (en) 1974-07-30
DE2054839A1 (de) 1972-05-18
CH537569A (de) 1973-05-31

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