Solid-state electricity meter

• US 6,734,663 B2
• Filed: 07/26/2002
• Issued: 05/11/2004
• Est. Priority Date: 07/27/2001
• Status: Expired due to Term

• Current Assignee: Sensus Spectrum, LLC (Xylem, Inc.)
• Original Assignee: Invensys Metering Systems/North America Incorporated
• Inventors: Johnson, Mark A., Fye, Jeffery F.
• Primary Examiner(s): Pert, Evan
• Assistant Examiner(s): Nguyen, Tung X.
• Application Number:
  US10/205,489
• Publication Number:
  US 20030025493A1
• Time in Patent Office: 655 Days
• Field of Search: 324/142, 324/96, 324/157, 324/158.1, 361/367, 361/372-373, 361/415, 361/730
• US Class Current: 324/142
• CPC Class Codes: G01R 22/00 Arrangements for measuring time integral of electric power or current, e.g. electricity meters
• CPC Class Codes: G01R 22/065 related to mechanical aspects

Abstract

A solid-state electricity meter uses a sensor to measure a current supplied to a load. In one aspect, the electricity meter housing includes a meter base, a register cover, and a meter cover. The meter base includes a plurality of meter cover lock notches disposed about a periphery of the meter base. The register cover includes a plurality of secure ramps disposed on a base portion thereof, each secure ramp having a ramped portion along one side and a land portion. The meter cover includes a plurality of locking tabs corresponding to the meter cover lock notches and further includes a plurality of meter cover locks corresponding to the secure ramps. Upon insertion of the meter cover locking tabs into the meter base lock notches and rotation of the meter cover in a predetermined clockwise or counterclockwise direction, the meter cover locks engage the corresponding secure ramps, thereby biasing the meter cover locking tabs against the backside of the meter base to provide a secure connection.

Claims

1. A utility meter for measuring electric power consumption comprising:

a meter base having a front surface and a back surface and comprising a plurality of supports projecting from said front surface and defining a plurality of slotted through-holes disposed adjacent said supports, each of said supports bearing a plurality of resilient locking members at predetermined locations thereof, said resilient locking members configured to engage a circumferential edge of a circuit board bearing at least one electrical device;

a circuit board comprising a sensor for measuring a current supplied to a load;

a bus bar comprising an upper bus bar portion and a lower bus bar portion, each of said upper bus bar portion and lower bus bar portion comprising two substantially planar blades configured for insertion at least partially through said slotted through-holes;

a plurality of resilient bus bar locks disposed adjacent respective slotted through-holes, said resilient bus bar locks comprising an engaging portion at least partially overlapping the adjacent slotted through-hole; and

a solid-state energy metering circuitry configured for generating power consumption signals from the sensor output,

wherein said bus bar is configured to retain said sensor between the upper bus bar portion and lower bus bar portion, and

wherein said engaging portion of said resilient bus bar lock is configured to be displaced from an initial position to a second position by said blades upon insertion of the blades into said slotted through-holes and to return to said initial position following complete insertion of said blade into said through-hole to engage a top surface of said blades and thereby impede withdrawal of said blades from said slotted through-hole.

2. A utility meter for measuring electric power consumption according to claim 1, wherein said meter base further comprises bus bar guides extending outwardly from an upper face of the meter base and disposed adjacent said slotted through-holes.

3. A utility meter for measuring electric power consumption according to claim 2, wherein said meter base further comprises a register cover lock tab.

4. A utility meter for measuring electric power consumption according to claim 3, wherein said bus bar guides are provided adjacent said resilient bus bar locks.

5. A utility meter for measuring electric power consumption according to claim 4, wherein said resilient bus bar lock engaging portion comprises a chamfered upper surface and a substantially planar lower surface.

6. A utility meter for measuring electric power consumption according to claim 5, further comprising a plurality of phantom load conductor sockets defining through-holes in said meter base, said phantom load conductor sockets including a boss on a front surface of said meter base, said boss defining a polygonal opening.

7. A utility meter for measuring electric power consumption according to claim 6, further comprising a plurality of phantom load conductors electrically connected at one end, to phantom load circuit traces on the circuit board bearing said sensor and electrically connectable via an electrical connection means, at another end, to a phantom load link disposed on a back side of said meter base, at least a portion of said phantom load conductors comprising a polygonal portion corresponding in shape and location to said polygonal opening, so as to prevent rotation of said phantom load conductors relative to said phantom load conductor sockets.

8. A utility meter for measuring electric power consumption according to claim 7, said electrical connection means comprises a screw inserted into a corresponding one of said phantom load conductor sockets from the back side of said meter base to contact a corresponding phantom load conductor.

9. A utility meter for measuring electric power consumption according to claim 7, wherein said circuit board defines through-holes in positions corresponding to a location of said phantom load conductors.

10. A utility meter for measuring electric power consumption as in claim 7, wherein the base further comprises a meter hanger for attaching the meter to a surface and T-bar connectors for detecting unauthorized access to the meter.

11. A utility meter for measuring electric power consumption as in claim 1, further comprising a register cover having a plurality of secure ramps disposed on a base portion thereof, each of said secure ramps having a ramped portion along one side and a land portion,

wherein said meter base further comprises a plurality of meter cover lock notches,

wherein said meter cover further comprises a plurality of meter cover locks corresponding to said plurality of secure ramps, and a plurality of locking tabs corresponding to said plurality of meter cover lock notches, and

wherein upon insertion of the meter cover locking tabs into the meter base lock notches and rotation of the meter cover in one of a predetermined clockwise or counterclockwise direction, the meter cover locks engage the corresponding secure ramps, thereby biasing the meter cover locking tabs against the backside of the meter base to provide a secure connection.

12. A utility meter for measuring electric power consumption as in claim 11, further comprising a circuit board bearing at least one electrical device between said plurality of supports by a corresponding plurality of said resilient locking members.