Electrical switch

• US 4,339,638 A
• Filed: 10/15/1980
• Issued: 07/13/1982
• Est. Priority Date: 10/15/1980
• Status: Expired due to Term

• Current Assignee: Mcdonnell Douglas Corporation (The Boeing Co.)
• Original Assignee: Mcdonnell Douglas Corporation (The Boeing Co.)
• Inventors: Walker, Jack M., Lascelles, Daniel J.
• Primary Examiner(s): Scott, James R.
• Application Number:
  US06/197,199
• Time in Patent Office: 636 Days
• Field of Search: 200/329, 200/300, 200/82 R, 200/82 C, 200/51.12, 200/51.13, 200/16 R, 200/16 A, 200/16 B, 200/52 R, 200/61.08, 200/61.53, 200/61.19, 200/153 M , 200/51 R, 200/243, 200/237, 200/238, 102/216, 102/262-264, 339/19, 174/94 R, 337/406, 337/412, 337/413, 337/416
• US Class Current: 200/52.00R
• CPC Class Codes: H01H 39/00 Switching devices actuated by an explosion produced within the device and initiated by an electric current

Abstract

An electrical switch includes a body having one open end exposed for adaptation of a pyrotechnic cartridge and the other end sealed by the base of a pin type connector assembly having short conductive pins and elongated conductive pins with relief areas containing insulative material. The pins are inserted into the body cavity. A conductive grounding plate or plates have tabs which bite into the pins and connect selected pins in a first operational state. A plunger having fracturable bosses is located adjacent the contact plate. Upon activation of a pyrotechnic cartridge, pressure is applied to the plunger, causing fracture of the bosses and resulting in the displacement of the plunger to move the contact plate to a different position thereby changing the number of closed circuits.

Claims

1. An electrical switch comprising:

a body, a plurality of parallel pins mounted on the body, the pins being electrically conductive;

a dielectric member mounted on the body and containing holes with which the pins align, the dielectric member and the pins being arranged such on the body that the relative positions of the dielectric member and the pins can be changed from a first position to a second position along the axis of the pins; and

an electrically conductive contact plate mounted on the dielectric member and having apertures that align with the holes in the dielectric member, the apertures being configured to, in at least one of the positions, receive the pins while gripping the pins tightly along their edges, so as to change the condition of an electrical circuit to which the pins are connected.

2. A switch according to claim 1 wherein the pins are in the holes of the dielectric member in both of the relative positions.

3. A switch according to claim 1 wherein the pins are mounted in a fixed position on the body and the dielectric member is capable of moving within the body to change the condition of the switch.

4. A switch according to claim 3 wherein the body contains a cavity in which the dielectric member is disposed, the dielectric member having bosses which are attached thereto at regions of weakness, the bosses being against one end of the cavity when the dielectric member is in its first position, the dielectric member being adapted to fracture along the regions of weakness when a properly oriented force of sufficient magnitude is applied to the dielectric member so as to allow the dielectric member to shift to the second position under the influence of the force.

5. A switch according to claim 3 wherein at least one of the pins projects through the contact plate when the dielectric member is in its first position, and all of the pins project through the contact plate when the dielectric member is in its second position.

6. A switch according to claim 5 wherein at least one of the pins that projects through the contact plate when the dielectric member is in its first position has a metal core and a dielectric collar around the core intermediate the ends of the pin, the collar having substantially the same outside diameter as the portions of the core beyond each end of it so that the pin has a generally uniform diameter;

and wherein the contact plate grips the core in one of the positions for the dielectric member and grips the collar in the other of the positions for the dielectric member.

7. A switch according to claim 3 wherein the dielectric member comprises leading and trailing disks formed from a dielectric material with both disks having the holes in them, and the contact plates is interposed between the two disks.

8. A switch according to claim 1 wherein the apertures in the contact plate are smaller in diameter than the pins with which they align, and the contact plate further contains slots which intersect the apertures so as to in effect divide the area around the apertures into tabs which flex and enable the apertures to enlarge and accommodate the pins.

9. An electrical switch comprising:

a body containing a plunger cavity provided with a side wall that is parallel to the axis of the cavity;

a closure member extended across one end of the cavity;

electrically conductive pins mounted on the closure member and projecting into the cavity parallel to the axis of the cavity; and

a plunger positioned in the cavity loose enough to shift along the axis of the cavity from a first position to a second position when not otherwise restrained, the plunger being formed from a dielectric material and having holes in which the electrically conductive pins are received, the plunger also including an electrically conductive contact plate having apertures that align with the holes, the apertures being configured to at least in one of the positions receive and tightly grip the pins.

10. A switch according to claim 9 wherein the pins project beyond the closure member in the opposite direction from the plunger cavity and form part of a pin-type electrical connector.

11. A switch according to claim 9 wherein at least one of the pins projects through the contact plate of the plunger in both positions of the plunger.

12. A switch according to claim 11 wherein at least one of the pins is ahead of the contact plate when the plunger is in its first position, but is gripped by the contact plate when the plunger is in its second position.

13. A switch according to claim 11 wherein one of the pins projects through the contact plate in both positions of the plunger and has a metal core and a dielectric collar around the core with the collar having the same outside diameter as the exposed portion of the core so that the diameter of that portion of the pin that is within the cavity is substantially uniform through the cavity, the contact plate being around the exposed portion of the core in one position for the plunger and around the dielectric collar in the other position of the plunger.

14. A switch according to claim 9 wherein the plunger includes two dielectric disks which are attached firmly together, with the contact plate interposed between them.

15. A switch according to claim 9 and further comprising means for holding the plunger in the first position, but being capable of allowing the plunger to move to the second position when sufficient force is applied to the plunger.

16. A switch according to claim 15 wherein the means for holding the plunger in the first position comprises bosses attached to the plunger along regions of weakness and projected axially therefrom toward the closure member, the plunger being adapted to fracture along the regions of weakness when a properly oriented axially directed force of sufficient magnitude is applied to the plunger, the plunger further having a void opening out of its periphery for accommodating the bosses after they are dislodged from the plunger, whereby the plunger will shift toward the closure member under the influence of the force.