Patent ID: 6917135

Claim:
An insulating member for a carbon brush holder, said insulating member comprising: a main body made of thermosetting material, said main body having a first end and a second end at two ends thereof and a through hole running said first and second ends, said through hole having a first section abutting said first end for receiving a copper member, and a second section abutting said first section and said second end, said second section having an internal thread formed around its periphery, said internal thread having a spiral internal thread tooth, said internal thread tooth having a first internal tooth bevel facing said first end and a second internal tooth bevel facing said second end, said first internal tooth bevel having a larger distance between a peak and a bottom of said internal thread tooth than that of said second internal tooth bevel, said second internal tooth bevel having a first convexity abutting said first internal tooth bevel; and a cover member having an external thread formed around its external periphery for fitting said internal thread of said main body to enable said cover member to be threadedly mounted into said second section of said main body.