Jitter switch

• US 5,354,958 A
• Filed: 03/03/1993
• Issued: 10/11/1994
• Est. Priority Date: 03/03/1993
• Status: Expired due to Term

• Current Assignee: Polaron Engineering Limited (Eaton Corporation PLC.), PNC Bank National Association (The PNC Financial Services Group, Inc.)
• Original Assignee: Fifth Dimension, Inc.
• Inventors: Bitko, Sheldon S.
• Primary Examiner(s): SCOTT, JAMES R
• Application Number:
  US08/025,745
• Time in Patent Office: 587 Days
• Field of Search: 200/61.45 R, 200/61.53, 200/61.45 M
• US Class Current: 200/61.45R
• CPC Class Codes: H01H 35/14 Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch wherein the liquid constitutes a contact of the switch H01H29/002

Abstract

A jitter switch comprises a casing defining therein a chamber in which an armature is freely movable in longitudinal and transverse directions. Positive and negative terminals communicate with the chamber. The armature is freely movable longitudinally to make contact with either of the positive and negative terminals. In every longitudinal position of the armature, the armature and terminals define transversely opposite conductors. The armature is freely movable in the transverse direction to bring the transversely opposite conductors into engagement.

Claims

1. A jitter switch, comprising:

a casing including a cylindrical wall defining a first longitudinal axis and forming a cylindrical chamber, said cylindrical wall formed of an electrically conductive material;

first and second electrodes mounted at opposite longitudinal ends of said chamber in fixed longitudinally spaced relationship to one another, said first and second electrodes being of opposite polarity, and one of said first and second electrodes being electrically connected to said cylindrical wall; and

an electrically conductive armature disposed within said chamber and comprising a body, said body defining a second longitudinal axis and first and second longitudinally spaced ends, said body being symmetrical about said second longitudinal axis, said armature having an outer periphery and a protuberance extending circumferentially around said outer periphery at a location between said first and second armature ends for engaging said cylindrical wall and defining a fulcrum about which said armature pivots, said armature being movable parallel to said first axis to bring said first and second armature ends into engagement with said first and second electrodes, respectively, and being movable laterally of said first axis to enable said protuberance to contact different portions of said cylindrical wall.

2. A jitter switch according to claim 1, wherein said first electrode comprises an end wall defining said first end of said chamber, said second electrode comprising a post extending into said chamber along said first axis and terminating in a convexly curved surface, a center portion of said first end of said armature projecting toward said first end wall, and said second end of said armature forming a recess into which said second electrode extends.

3. A jitter switch according to claim 2, wherein said center portion of said first end of said armature makes point contact with said end wall, and said convexly curved surface makes substantially point contact with a surface defining said recess.

4. A jitter switch according to claim 2, wherein said recess includes a cylindrical side surface coaxial with said second axis, and an inner end surface closing an inner end of said recess.

5. A jitter switch according to claim 1, wherein said chamber is sealed air tight.

6. A jitter switch according to claim 1, wherein said chamber is filled with dampening liquid.

7. A jitter switch according to claim 1, wherein an outer face of said protuberance is convexly curved.

8. A jitter switch according to claim 1, wherein said outer periphery of said body is of cylindrical cross-sectional shape.

9. A jitter switch, comprising:

a casing forming an inner chamber defining a first longitudinal axis and including first and second end walls disposed at opposite longitudinal ends of said chamber;

first and second electrodes each comprising a post projecting through a respective one of said end walls and terminating in a convexly curved surface, said posts extending coaxially and being of opposite polarity;

an electrically conductive armature disposed within said chamber and comprising a body defining a second longitudinal axis, said body being symmetrical about said second axis, each longitudinal end of said body including a recess into which a respective one of said first and second electrodes extends, each recess including a cylindrical side wall and an end wall, said armature being movable in a direction parallel to said first axis to enable said convexly curved surfaces to engage said end walls of said recesses, and being movable in a direction laterally of said first axis to enable said convexly curved surfaces to engage said side walls of said recesses.

10. A jitter switch according to claim 9, wherein said chamber is sealed air tight.

11. A jitter switch according to claim 9, wherein said chamber is filled with dampening fluid.

12. A non-magnetic jitter switch, comprising:

a casing forming an inner chamber defining a first longitudinal axis and including first and second end walls disposed at opposite longitudinal ends of said chamber;

first and second electrodes, each extending through a respective one of said end walls and terminating in a recess, said recesses being coaxial with one another and each recess including a cylindrical side wall and being inwardly closed by an end wall;

an electrically conductive armature disposed within said chamber and comprising a post defining a second longitudinal axis, opposite longitudinal ends of said post disposed in respective ones of said recesses and each post terminating in a convexly curved surface, said armature being movable in a direction parallel to said first axis to enable said convexly curved surfaces to engage respective ones of said end walls of said recesses, and being movable in a direction laterally of said first axis to enable said convexly curved surfaces to engage said side walls of respective ones of said recesses, said electrodes and armature being non-magnetized.

13. A jitter switch according to claim 12, wherein said chamber is sealed air tight.

14. A jitter switch according to claim 12, wherein said chamber is filled with dampening fluid.

15. A jitter switch comprising:

a casing forming a circular cylindrical internal chamber defining longitudinal and transverse directions, said longitudinal direction coinciding with a longitudinal axis of said chamber, and said transverse direction coinciding with a diameter of said chamber;

an electrically conductive generally cylindrical armature disposed in said chamber; and

positive and negative electrical terminal means communicating with said chamber;

said armature, together with said positive and negative electrical terminal means defining first and second contact regions in said chamber, each of said contact regions comprising;

longitudinally opposite conductors defined by said armature and a respective one of said positive and negative terminals; and

transversely opposite conductors defined by said armature and a respective one of said positive and negative terminals;

said armature being movable in said longitudinal direction for producing engagement between said longitudinally opposite conductors of either of said first and second contact regions;

said transversely opposite conductors of each contact region remaining in transversely opposite relationship in all longitudinal positions of said armature, and said armature being movable in said transverse direction for producing engagement between said transversely opposite conductors of either or both of said contact regions;

one of said contact regions comprising a circular cylindrical recess formed in one of said armature and respective terminal means, with the other of said armature and respective terminal means projecting into said recess, and the other contact region comprising a wall of said chamber and protuberance carried by said armature;

an end of said armature disposed opposite said recess being generally conical;

said protuberance extending circumferentially around an outer periphery of said armature at a location between said recess and said frusto-conical end of said armature.