Actuator/wedge improvements to embedded meter switch

• US 8,395,464 B2
• Filed: 05/28/2009
• Issued: 03/12/2013
• Est. Priority Date: 05/30/2008
• Status: Active Grant

• Current Assignee: Itron, Inc.
• Original Assignee: Itron, Inc.
• Inventors: Pontin, Joseph, Makinson, David N., O'Dell, Larry
• Primary Examiner(s): Rojas, Bernard
• Application Number:
  US12/473,692
• Publication Number:
  US 20090295371A1
• Time in Patent Office: 1,384 Days
• Field of Search: 335 78- 86, 335121-132, 200/329, 200/239
• US Class Current: 335/121
• CPC Class Codes: G01R 1/04 Housings; Supporting members; Arrangements of terminals
• CPC Class Codes: H01H 3/32 Driving mechanisms, i.e. for transmitting driving force to the contacts snap-action arrangements H01H5/00; introducing a predetermined time delay H01H7/00
• CPC Class Codes: H01H 71/123 using a solid-state trip unit circuits H02H
• CPC Class Codes: Y04S 20/30 Smart metering, e.g. specially adapted for remote reading

Abstract

Disclosed is a wedge shaped actuator device configured to provide separation of spring supported electrical contacts in an electrical switch. The wedge is configured with dual contour sides to maximize transfer of energy from a drive solenoid to the contact carrying springs. Portions of the wedge are relieved to allow for uninhibited movement of the wedge over side surfaces of the contact carrying springs to avoid digging in of any rough materials from the side edges of the spring as may be occasioned due to stamping techniques used to form the springs.

Claims

1. A wedge shaped actuator device configured to provide separation of spring supported electrical contacts in an electrical switch, comprising an insulated wedge configured with plural contoured contact separating surfaces corresponding to a relatively lower and a relatively higher slope to maximize transfer of energy from a drive solenoid to the contact carrying springs,

whereby each of said plural contoured contact separating surfaces applies contact separating force corresponding to differences in pulling capacity as said drive solenoid traverses its travel path.

2. A wedge shaped actuator device as in claim 1, wherein portions of said wedge are relieved to allow for uninhibited movement of said wedge over side surfaces of the contact carrying springs to avoid digging in from the side edges of such springs.

3. A wedge shaped actuator device as in claim 1, wherein said plural contoured sides comprise plural sloped portions such that a first portion is provided with a relatively lower slope while a second portion is provided with a relatively higher slope.

4. A wedge shaped actuator device as in claim 1, further including a plurality of said insulated wedges, configured to simultaneously and respectively separate multiple contacts.

5. A wedge shaped actuator device as in claim 1, wherein said insulated wedge has a generally Y-shaped cross-section.

6. A wedge shaped actuator device as in claim 1, wherein said insulated wedge comprises molded plastic.

7. A wedge shaped actuator device as in claim 1, further including a drive solenoid associated with said insulated wedge, and directly integrated with a high current switching circuit within a utility meter.

8. A utility meter having a service disconnect switch integrated into the base thereof, said meter comprising:

a metrology board;

a base integrally including high current circuit elements corresponding to a line side terminal assembly and a load side terminal assembly, each respectively configured for insertion into a utility meter socket;

contacts associated with said line side terminal assembly;

at least two pairs of spring elements respectively connected at one end thereof to the meter load terminal, with the opposite ends of said spring elements carrying contacts configured for cooperation with said line side terminal assembly contacts, so as to form contact pairs of a switch;

a solenoid having a movable actuator; and

an insulative wedge configured to be moved by said movable actuator for travel between portions of the spring element pairs to thereby separate corresponding contact pairs, for interrupting any current flow through said high current circuit elements, said insulative wedge having plural contact separating surfaces which comprise plural sloped portions such that a first portion is provided with a relatively lower slope while a second portion is provided with a relatively higher slope, for maximizing transfer of energy from said solenoid to said contact carrying springs,

whereby each of said plural contoured contact separating surfaces applies contact separating force corresponding to differences in pulling capacity as said movable actuator traverses its travel path.

9. A utility meter as in claim 8, further including:

at least two pairs of said contact pairs; and

at least a pair of said wedges respectively associated with said movable actuator and configured so as to respectively separate said contact pairs.

10. A utility meter as in claim 8, wherein said insulative wedge comprises molded plastic, with portions thereof relieved to allow for uninhibited movement of said wedge over side surfaces of the contact carrying springs to avoid digging in from the side edges of such springs.

11. A utility meter as in claim 8, wherein said insulative wedge includes a Y-shaped cross-section.

12. A method of providing a utility meter with a service disconnect switch integrated into the base thereof, such method comprising:

providing a meter having;

a metrology board;

a base integrally including high current circuit elements corresponding to a line side terminal assembly and a load side terminal assembly, each respectively configured for insertion into a utility meter socket;

contacts associated with such line side terminal assembly;

at least two pairs of spring elements respectively connected at one end thereof to the meter load terminal, with the opposite ends of such spring elements carrying contacts configured for cooperation with such line side terminal assembly contacts, so as to form contact pairs of a switch;

a solenoid having a movable actuator; and

an insulative wedge configured to be moved by such movable actuator for travel between portions of the spring element pairs to thereby separate corresponding contact pairs, for interrupting any current flow through such high current circuit elements; and

forming such insulative wedge with plural contact separating surfaces which comprise plural sloped portions such that a first portion is provided with a relatively lower slope while a second portion is provided with a relatively higher slope, with such slopes selected so as to maximize transfer of energy from such solenoid to such contact carrying springs based on drive characteristics of such solenoid,

whereby each of said plural contoured contact separating surfaces applies contact separating force corresponding to differences in pulling capacity as said movable actuator traverses its travel path.

13. A method as in claim 12, further including:

providing such meter with at least two pairs of such contact pairs; and

providing at least a pair of such wedges respectively associated with such movable actuator and configured so as to respectively separate said contact pairs.

14. A method as in claim 12, wherein such insulative wedge is formed of molded plastic, with portions thereof relieved to allow for uninhibited movement of such wedge over side surfaces of the contact carrying springs to avoid digging in from the side edges of such springs.

15. A method as in claim 12, wherein such insulative wedge is formed with a Y-shaped cross-section.