EP0220079A1 - Zweirichtungsbeschleunigungstrennschalter - Google Patents

Zweirichtungsbeschleunigungstrennschalter Download PDF

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Publication number
EP0220079A1
EP0220079A1 EP86401860A EP86401860A EP0220079A1 EP 0220079 A1 EP0220079 A1 EP 0220079A1 EP 86401860 A EP86401860 A EP 86401860A EP 86401860 A EP86401860 A EP 86401860A EP 0220079 A1 EP0220079 A1 EP 0220079A1
Authority
EP
European Patent Office
Prior art keywords
mass
pins
housing
accelerometric
masses
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.)
Withdrawn
Application number
EP86401860A
Other languages
English (en)
French (fr)
Inventor
Jean Fromentin
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
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 Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP0220079A1 publication Critical patent/EP0220079A1/de
Withdrawn legal-status Critical Current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
    • H01H35/145—Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch operated by a particular acceleration-time function

Definitions

  • the present invention relates to a bidirectional accelerometric disconnector requiring two accelerations in opposite directions to be effective.
  • the invention applies to very varied fields such as aerospace where acceleration and deceleration can result from a trajectory in the atmosphere, or in the field of robotics where machines use back and forth movements. come. It can also be applied in the field of safety when it is necessary to cut or establish an electrical contact, for example in the event of a mechanical incident or a traffic accident (road, rail, air), and in restrictive environments requiring the establishment or breaking of direct or impulse currents, in particular of very high level.
  • the subject of the invention is a bidirectional accelerometric disconnector making it possible to establish or cut one or more electrical contacts after application of two successive accelerations and in opposite directions.
  • an accelerometric disconnector comprising: - a housing, - at least one pair of facing electrical contact pins in said housing, and - mechanical means for reversing the state of electrical continuity between said pins; said means comprise a first mass housed in the housing and sensitive to an acceleration of the housing in a first direction to move into an arming position in which it is automatically secured by locking means, of a second mass housed in the housing, the first and second masses secured by said locking means being sensitive to an acceleration of the housing in a second direction opposite to the first, to move into an actuating position.
  • the state of electrical continuity between said pins is reversed by the displacement of the second mass in the actuation position.
  • the housing comprises two end walls in which are mounted the pins electrically isolated from said end walls; the first mass is normally applied against one of the walls by first elastic means and the second mass is normally applied against the other wall by second elastic means.
  • the second mass comprises a hole constituted for example by a bore in the axis of the pair of pins for bringing said pins into electrical contact by the walls of said hole. Said walls are electrically isolated from the second mass.
  • the first mass surrounds the second mass and the locking means comprise at least one spring lug capable of projecting radially from one of the masses to enter a groove formed in the other mass, when the first mass is in the arming position.
  • the groove comprises an inclined edge allowing the two masses to be unlocked.
  • the accelerometric disconnector of the sliding means are placed between the two masses.
  • These sliding means comprise for example at least three balls or three rollers housed in three circumferentially spaced grooves and formed in one of the masses.
  • the housing contains a fluid for damping the movements of the masses.
  • the accelerometric disconnector comprises several pairs of electrical contact pins parallel to each other, the second mass comprising at most one hole per pair of pins.
  • the accelerometric disconnector according to the invention comprises a housing constituted by two plane end walls 5, 7 parallel to each other, connected by a cylindrical wall 9. Each of the end walls 5 , 7 is crossed by one or more aligned electrical contact pins 1, 3, respectively. These pins 1, 3 are electrically isolated from the walls 5, 7. There is shown in solid line and in broken lines the cases where each wall is crossed by one and two pins. The pins 1, 3 are perpendicular to the walls 5, 7 and therefore parallel to the axis of the housing. They protrude inside the housing and can be connected outside of it to any suitable electrical circuit.
  • first mass M1 of annular shape, applied against the wall 7 of the housing by a spring K1 bearing on the opposite wall 5.
  • the annular mass M1 defines by its internal cylindrical surface a chamber 14.
  • This annular mass M1 is disposed coaxially inside the wall 9 of the housing, its axis being parallel to the pins 1, 3 so as to be able to move along this axis towards the wall 5 of the housing.
  • the means for reversing the state of electrical continuity further comprise a second cylindrical mass M2 applied against the wall 5 of the housing by a spring K2 bearing on the opposite wall 7.
  • This mass M2 is arranged coaxially with the mass M1, so to be able to slide inside the mass M1, in the chamber 14.
  • sliding means are placed between the two masses M1, M2.
  • These sliding means comprise at least three longitudinal grooves 15, located on the internal cylindrical surface of the mass M1, in which are received balls 13 or rollers which roll on the external cylindrical surface of the mass M2.
  • the lengths of the masses M1 and M2 of the housing are such that the end of the mass M2, facing the wall 7, is partly fitted tee in the end of the mass M1, opposite the wall 5.
  • the second mass M2 comprises a hole 10 constituted for example by a bore along the axis of each pair of pins 1, 3, each hole opening onto the end faces of the mass M2, parallel to the walls 5, 7 of the housing.
  • Each pin of a pair of electrical contact pins 1, 3 can slide in the hole 10 which corresponds to it, during back and forth movements of the mass M2 in the direction of the pins.
  • the conductive walls 11 of the latter make it possible to establish electrical contact between these two pins.
  • all or part of the walls 11 of each hole is covered with a deposit of conductive material to allow the two pins 1, 3 of a pair to be electrically connected by contact with this deposit.
  • the walls 11 are electrically isolated from the mass M2.
  • Locking means are provided between the masses M1 and M2 to make them integral with one another during an acceleration causing the mass M1 towards the wall 5 of the housing.
  • These means comprise at least one spring lug 17, housed in a radial hole opening onto the internal surface of the mass M1, near its end closest to the wall 5.
  • the locking means also include an annular groove 18 formed on the external surface of the mass M2, near its end closest to the wall 5.
  • the edge 19 of the groove 18 located on the side of the wall 7 can be inclined to allow the lug 17 to retract.
  • the locking and unlocking of the masses M1 and M2 will be described later in more detail with reference to Figures 2a and 2b. It is understood that any other means making it possible to keep the masses M1 and M2 attached and, possibly, to unhook them can be used in the disconnector of the invention.
  • the movements of the mass M1 and of the mass M2 are damped, for example, by the flow of a fluid such as oil essentially between the walls of the masses M1 and M2.
  • the electric pin 1, carried by the first wall 5, is then in electrical contact with the walls 11 of the hole 10 which corresponds to it in the mass M2.
  • the pin 3, carried by the second wall 7, is not in contact with the walls 11 of this hole 10.
  • a first acceleration ⁇ 1 ( Figure 2a), applied to the housing in a direction parallel to the axis defined by pins 1, 3 and in a direction from the first wall 5 towards the second wall 7, the mass M1 moves towards the wall 5 in the opposite direction to the acceleration ⁇ 1, towards an arming position; the mass M1 thereby compresses the spring K1.
  • the value of the acceleration ⁇ 1, necessary to move the mass M1 towards the mass M2 is a function, except for the friction forces, of the value of the mass M1 and the stiffness of the spring K1.
  • the mass M2 remains pressed against the wall 5.
  • the pins 17 are housed in the groove 18 formed in the mass M2, thus making the masses M1 and M2 integral.
  • the mass M1 is blocked at a greater or lesser distance from the wall 5.
  • the displacement of the masses M1 and M2 towards the wall 7 takes place when the acceleration ⁇ 2 has a determined value, a function of the masses M1 and M2 and of the stiffness of the springs K1 and K2 to the nearest friction forces.
  • the length of the pins 1 and 3 used makes it possible to determine the axial positions of the lugs 17 and of the groove 18.
  • the lugs 17 and the groove 18 are arranged so that the pin 3 enters the hole 10 when the mass M1 secured to the mass M2 comes into abutment with the wall 7.
  • a fugitive contact is obtained by unlocking the masses M1 and M2 after the successive accelerations ⁇ 1 and ⁇ 2, that is to say after the establishment of the electrical contact.
  • an unlocking system is associated with the disconnector according to the invention.
  • FIG. 1 to 2b An example of unlocking embodiment is shown in Figures 1 to 2b.
  • the groove 18 comprises an inclined edge 19, so that said groove 18 offers a larger opening on the external wall of the mass M2.
  • the mass M1 is integral with the mass M2 until the latter, by the stiffness of its spring K2, pushes back by the inclined edge 19, the lugs 17 which retract.
  • the mass M2 is released from the mass M1, the spring K2 relaxes; pin 3 is no longer in contact with the walls 11 of hole 10, the contact is again open.
  • the disconnector can then during new successive accelerations ⁇ 1 and ⁇ 2 restore the electrical contact between the pins 1, 3.
  • unlocking systems can be envisaged, in particular by the use of an electromagnet repelling by its magnetic core the mass M2 towards the first wall 5, after two successive accelerations ⁇ 1 and ⁇ 2.
  • FIG. 1 shows a hole 10 per pair of pins but it is understood that the mass M2 may include holes common to several pairs of pins arranged in the same plane, depending on the use of the disconnector.
  • the masses M1 and M2 are preferably of cylindrical shape, but other shapes, in particular parallelepipedal, can be envisaged.
  • Each of the masses M1 and M2 can also consist of several masses assembled in particular of two masses, the spacing between these two masses respectively forming the chamber 14 and the hole 10.
  • several springs can be used in the disconnector of the invention.
  • the wall 9 can completely or partially surround the means for reversing the state of electrical continuity between the pins.
  • the disconnector can be with the contact closed at rest and with the contact open after two successive accelerations ⁇ 1 and ⁇ 2.
  • the disconnector can be with the contact closed at rest and with the contact open after two successive accelerations ⁇ 1 and ⁇ 2.
  • a longer pin 3 and a shorter pin 1 are used than in the embodiment described in Figures 1 to 2b, so that pins 1 and 3 are in contact with the walls 11 of the hole 10 at rest , and that the pin 1 is no longer in contact with the walls 11 of this hole 10 after two successive accelerations ⁇ 1 and ⁇ 2.
  • this type of disconnector one can obtain a continuous or fugitive contact.
  • the disconnector according to the invention can have a reduced overall size with a diameter of around 30 mm and a length of around 70 mm. It is capable of operating normally in a thermal environment ranging from about -25 ° C to + 70 ° C, in a mechanical environment of static accelerations and white noise. On the other hand, insensitive to attack, it does not work in an accidental environment such as in a high level of shock, in a fire.
  • the disconnector according to the invention makes it possible to establish between two electric pins, respectively in the case of a continuous or fugitive contact, a direct current of approximately 10 A or pulse of approximately 3000 A for 2 ⁇ s, under a voltage ranging from 0 to 4 kV.
  • the two successive accelerations ⁇ 1 and ⁇ 2 in opposite directions correspond respectively to both an acceleration followed by a deceleration and a decelaration followed by an acceleration.
  • the applications of the disconnector according to the invention are very wide, an appropriate calculation of the value of the masses, the stiffness of the springs and the length of the electric pins makes it possible to adapt the disconnector of the invention to a determined problem, even in a restrictive environment.

Landscapes

  • Switches Operated By Changes In Physical Conditions (AREA)
  • Vibration Prevention Devices (AREA)
EP86401860A 1985-08-27 1986-08-22 Zweirichtungsbeschleunigungstrennschalter Withdrawn EP0220079A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8512782 1985-08-27
FR8512782A FR2586857B1 (fr) 1985-08-27 1985-08-27 Sectionneur accelerometrique bidirectionnel

Publications (1)

Publication Number Publication Date
EP0220079A1 true EP0220079A1 (de) 1987-04-29

Family

ID=9322420

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86401860A Withdrawn EP0220079A1 (de) 1985-08-27 1986-08-22 Zweirichtungsbeschleunigungstrennschalter

Country Status (4)

Country Link
US (1) US4749828A (de)
EP (1) EP0220079A1 (de)
JP (1) JPS6251122A (de)
FR (1) FR2586857B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2710188A1 (fr) * 1993-09-16 1995-03-24 Giat Ind Sa Interrupteur à commande accélérométrique.
CN108627677A (zh) * 2017-03-23 2018-10-09 Nts株式会社 弹性卡销以及具有其的测试插座

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090242362A1 (en) * 2007-10-19 2009-10-01 Wilbur Dale Jones Unguided ballistic warhead fuse switching device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3022393A (en) * 1959-12-23 1962-02-20 Maxson Electronics Corp Acceleration switch
FR2138288A1 (de) * 1971-05-21 1973-01-05 Puget Pierre
US3859650A (en) * 1973-11-29 1975-01-07 Gen Motors Corp Acceleration-responsive sensor with readiness indicator circuit

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3096411A (en) * 1961-08-24 1963-07-02 Alex F Chabrek Acceleration responsive switch
US3889130A (en) * 1973-06-04 1975-06-10 Breed Corp Mass in liquid vehicular crash sensor
US4266107A (en) * 1979-08-20 1981-05-05 The United States Of America As Represented By The United States Department Of Energy Acceleration switch
US4345124A (en) * 1979-08-29 1982-08-17 The United States Of America As Represented By The United States Department Of Energy Acceleration switch
US4574168A (en) * 1984-06-27 1986-03-04 The United States Of America As Represented By The United States Department Of Energy Multiple-stage integrating accelerometer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3022393A (en) * 1959-12-23 1962-02-20 Maxson Electronics Corp Acceleration switch
FR2138288A1 (de) * 1971-05-21 1973-01-05 Puget Pierre
US3859650A (en) * 1973-11-29 1975-01-07 Gen Motors Corp Acceleration-responsive sensor with readiness indicator circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2710188A1 (fr) * 1993-09-16 1995-03-24 Giat Ind Sa Interrupteur à commande accélérométrique.
CN108627677A (zh) * 2017-03-23 2018-10-09 Nts株式会社 弹性卡销以及具有其的测试插座
CN108627677B (zh) * 2017-03-23 2020-10-09 Nts株式会社 弹性卡销以及具有其的测试插座

Also Published As

Publication number Publication date
JPS6251122A (ja) 1987-03-05
US4749828A (en) 1988-06-07
FR2586857A1 (fr) 1987-03-06
FR2586857B1 (fr) 1988-07-01

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