Clamp jaw assembly

• US 7,884,598 B2
• Filed: 08/30/2007
• Issued: 02/08/2011
• Est. Priority Date: 08/30/2007
• Status: Active Grant

• Current Assignee: Fluke Corporation (Fortive Corp.)
• Original Assignee: Fluke Corporation (Fortive Corp.)
• Inventors: Wang, Yong, Yang, Yinhong
• Primary Examiner(s): Nguyen; Ha Tran T
• Assistant Examiner(s): ISLA RODAS, RICHARD
• Application Number:
  US11/848,094
• Publication Number:
  US 20090058399A1
• Time in Patent Office: 1,258 Days
• Field of Search: 324/127, 324/117.H, 324/117.R, 324/158.1
• US Class Current: 324/127
• CPC Class Codes: G01R 1/22 Tong testers acting as secondary windings of current transformers

Abstract

A method of manufacturing a clamp jaw assembly for a clamp meter is provided. The method includes providing a clamp jaw core and a shield having a channel. The method further includes positioning the clamp jaw core within the channel of the shield such that the shield surrounds a portion of the clamp jaw core. The method also includes enclosing the clamp jaw core and the shield within a clamp jaw housing.

Claims

1. A method of manufacturing a clamp jaw assembly for a clamp meter, the method comprising:

(a) providing a clamp jaw core having a cross-sectional shape defined by at least two exterior surfaces extending between first and second ends of the clamp jaw core;

(b) providing a shield having a channel, wherein the shield is made of a nonconductive material;

(c) positioning the clamp jaw core within the channel of the shield such that an exterior surface extending between the first and second ends remains exposed, wherein the clamp jaw core is not permanently fixed to the shield; and

(d) enclosing the clamp jaw core and the shield within a clamp jaw housing such that the clamp jaw core and shield are not fixed to an interior surface of the housing, to thereby provide the clamp jaw assembly for the clamp meter;

wherein the clamp jaw housing is made of a nonconductive material and includes top and bottom housings that define an interference connection therebetween extending from an exterior surface of the clamp jaw housing to an interior surface of the clamp jaw housing;

wherein a portion of the shield is positioned between the interference connection and the clamp jaw core; and

wherein a creepage and clearance path extends from the exterior surface of the clamp jaw housing, along the interference connection to the interior surface of the clamp jaw housing, and towards a portion of the jaw core exposed by the shield.

2. The method of claim 1, wherein the shield is made of a semi-rigid material.

3. The method of claim 1, further comprising disposing a biasing member between a portion of the shield and the interior surface of the housing.

4. The method of claim 3, wherein the biasing member is a sponge.

5. The method of claim 3, wherein the biasing member is a spring.

6. A method of manufacturing a clamp jaw assembly for a clamp meter, the clamp jaw assembly having first and second clamp jaws, the method comprising;

(a) providing a clamp jaw core having a cross-sectional shape defined by at least two exterior surfaces extending between first and second ends of the clamp jaw core;

(b) positioning the clamp jaw core within a shield made of a nonconductive material having a channel such that an exterior surface extending between the first and second ends remains exposed;

(c) providing a housing made of a nonconductive material having an upper portion and a lower portion, the upper and lower portions securable together to define an interference connection therebetween extending from an exterior surface of the clamp jaw housing to an interior surface of the clamp jaw housing;

(d) enclosing the clamp jaw core and the shield between the upper and lower portions of the housing such that a portion of the shield is positioned between the interference connection and the clamp jaw core and the interference connection extends along the length of the clamp jaw core; and

(e) positioning the clamp jaw core within the shield to define an exposed portion of the clamp jaw core, to thereby provide the clamp jaw assembly for the clamp meter;

wherein a creepage and clearance path extends from the exterior surface of the clamp jaw housing, along the interference connection to the interior surface of the clamp jaw housing, and towards the exposed portion of the clamp jaw core.

7. The method of claim 6, wherein the shield is made of a semi-rigid material.

8. A method of manufacturing a clamp jaw assembly for a clamp meter, the method comprising:

(a) providing a clamp jaw core having an arc length and a cross-sectional shape defined by at least two exterior surfaces extending along the arc length;

(b) providing a nonconductive shield having a channel;

(c) positioning the clamp jaw core within the channel of the shield such that an exterior surface remains exposed along its arc length;

(d) providing a housing made of a nonconductive material having an upper portion and a lower portion, the upper and lower portions securable together to define an interference connection therebetween extending from an exterior surface of the clamp jaw housing to an interior surface of the clamp jaw housing; and

(e) enclosing the clamp jaw core and the shield between the upper and lower portions of the housing such that a portion of the shield is positioned between the interference connection and the clamp jaw core and the interference connection extends along the arc length of the clamp jaw core, to thereby provide the clamp jaw assembly for the clamp meter;

wherein a creepage and clearance path extends from the exterior surface of the clamp jaw housing, along the interference connection to the interior surface of the clamp jaw housing, and towards the exterior surface of the jaw core exposed by the shield.

9. The method of claim 8, wherein the cross-sectional shape of the clamp jaw core is defined by four exterior surfaces extending along the arc length.

10. The method of claim 9, wherein the shield includes a first surface extending between first and second sidewalls to define the channel.

11. The method of claim 8, wherein the shield is made of a semi-rigid material.