Method and apparatus for connecting to a circuit in a jack without interrupting the circuit

• US 5,669,779 A
• Filed: 09/26/1995
• Issued: 09/23/1997
• Est. Priority Date: 09/26/1995
• Status: Expired due to Fees

• Current Assignee: Greenlee Textron Incorporated (Emerson Electric Company)
• Original Assignee: Industrial Technology Inc. (Textron Inc)
• Inventors: Galloway, George G., Moss, John N.
• Primary Examiner(s): Paumen, Gary F.
• Assistant Examiner(s): Ta, Tho Dac
• Application Number:
  US08/533,686
• Time in Patent Office: 728 Days
• Field of Search: 439/188, 439/669, 439/668, 29/854
• US Class Current: 439/188
• CPC Class Codes: H01R 2103/00 Two poles
• CPC Class Codes: H01R 24/58 Contacts spaced along longitudinal axis of engagement
• CPC Class Codes: Y10T 29/49169 Assembling electrical component directly to terminal or elongated conductor

Abstract

In a jack that receives a "make with break" plug or jack, there is provided a "make without break" plug. The jack has a circuit with a set of contacts that are normally closed. The circuit is opened by displacing one of the contacts out of contact with the other contact. With the make without break plug, only a minimal displacement of the jack contacts occurs. The plug minimizes the displacement of the jack contacts by limiting the physical size of the plug. A preferred embodiment utilizes a reduced radius to form a notch in the plug. This notch receives the jack contacts with little or no displacement of these contacts. Another technique used to minimize the displacement of the jack contacts is to limit the amount of force exerted by the plug against the jack contacts. The plug itself is provided with displaceable and pliant contacts. Less force is required to displace the plug contacts than is required to displace the jack contacts.

Claims

1. A method of connecting to a circuit in a jack, the jack having a port adjacent to the circuit, the circuit comprising first and second switch contacts that are normally closed together so as to provide continuity of the circuit, the first switch contact being displaceable to first and second displacements relative to the second switch contact, with the circuit being closed when the first switch contact is displaced to the first displacement due to the first switch contact being in contact with the second switch contact, and with the circuit being opened when the first switch contact is displaced to the second displacement due to the first switch contact being out of contact with the second switch contact, comprising the steps of:

a) providing a conductor with at least one surface that, when the one surface contacts the first switch contact, limits the displacement of the first switch contact to the first displacement so as to maintain circuit continuity through the first and second switch contacts;

b) inserting the conductor partially into the port of the jack;

c) rotating the conductor about a longitudinal axis so as to align the one conductor surface with the first switch contact;

d) continuing to insert the conductor fully into the port of the jack and limiting the displacement of the first switch contact to the first displacement during contact with the conductor so as to maintain circuit continuity through the first and second switch contacts.

2. The method of claim 1, further comprising the step of:

a) the one conductor surface is a first conductor surface;

b) providing the conductor with a second conductor surface that, when the second conductor surface contacts the first switch contact, displaces the first switch contact to the second displacement and out of contact with the second switch contact so as to open the circuit;

c) rotating the conductor about a longitudinal axis so as to align the second conductor surface to make contact with the first switch contact.

3. The method of claim 1 wherein:

a) the step of providing a conductor further comprises the step of providing the conductor with a free end that is flat;

b) the step of inserting the conductor partially into the port of the jack further comprises the step of inserting the conductor into the port of the jack until a resistance to further insertion is felt, wherein the flat free end contacts the first surface contact;

c) the step of rotating the conductor about a longitudinal axis further comprises the step of rotating the conductor until the resistance to further insertion lessens.

4. The method of claim 1 wherein the circuit is a digital circuit.

6. The plug of claim 4 wherein the free end of the conductor is flat and intersects with the notch.

5. A plug for insertion into a jack, the jack having a set of normally closed contacts therein, comprising:

a) a sleeve having an outside diameter, the outside diameter being formed by a sleeve radius, the sleeve being structured and arranged to be received by a port in the jack, the sleeve having an end;

b) a conductor that extends from the end of the sleeve, the conductor having a free end and a sleeve end, with the sleeve end of the conductor being connected to the sleeve, the conductor having a length, the conductor being offset from a longitudinal axis of the sleeve so as to form a notch that extends from the free end along the length of the conductor toward the sleeve end.

7. An apparatus for connecting to a circuit, comprising:

a) a jack, the jack having a port and comprising first and second switch contacts that are normally closed together so as to provide continuity of the circuit in the jack, the first switch contact being displaceable to first and second displacements relative to the second switch contact, with the circuit being closed when the first switch contact is displaced to the first displacement due to the first switch contact being in contact with the second switch contact, and with the circuit being opened when the first switch contact is displaced to the second displacement due to the first switch contact bring out of contact with the second switch contact;

b) a plug comprising a sleeve for being received by the jack port, the plug also comprising a conductor extending from the sleeve, the plug conductor comprises a first surface, the first surface having a first radius with respect to a longitudinal axis of the sleeve, the first surface extending from a free end of the conductor toward the sleeve, wherein when the first surface contacts the first switch contact, circuit continuity through the first and second switch contacts is maintained during the insertion of the plug conductor into the jack port.

8. The apparatus of claim 7 wherein the plug conductor comprises a second surface that has a second radius with respect to the longitudinal axis of the sleeve, wherein the second surface contacts the first switch contact, the first switch contact is displaced out of contact with the second switch contact, thereby opening the circuit.

9. The apparatus of claim 7 wherein the conductor is semicylindrical in shape.

10. The apparatus of claim 7 wherein the free end of the conductor is flat and intersects with the first surface.

11. The apparatus of claim 7 wherein the plug comprises a nonconductive handle located adjacent to the sleeve such that the sleeve is interposed between the handle and the conductor, the conductor rotating about the longitudinal axis with respect to the handle.

12. The apparatus of claim 7 wherein the circuit that the first and second switch contacts provide continuity for is a digital circuit.

13. The apparatus of claim 7 wherein;

a) the circuit in the jack is a first circuit, the jack also comprising a second circuit which has continuity provided by normally closed third and fourth switch contacts, the second circuit being opened by displacing the third switch contact out of contact with the fourth switch contact;

b) the plug conductor is a first conductor, the plug also comprising a second conductor that is insulated from the first conductor and that extends from the sleeve, the second conductor comprises a second surface, the second surface having a second radius with respect to the longitudinal axis of the sleeve, wherein when the second surface contacts the third switch contact, circuit continuity through the third and fourth switch contacts is maintained.

14. The apparatus of claim 13 wherein the first switch contact is displaced in a first direction when being displaced so as to open the first circuit, the third switch contact is displaced in a second direction when being displaced so as to open the second circuit, the second direction being different from the first direction.