David M Lemier

US Patent:

20080115926, May 22, 2008

Filed:

Nov 17, 2006

Appl. No.:

11/560951

Inventors:

Glenn Harold Middleton - The Woodlands TX, US
David Eugene Lemier - Houston TX, US

International Classification:

E21B 43/00
B23P 15/00

US Classification:

166 901, 166268, 29888021

Abstract:

A collar assembly for inclusion with, or for a retrofit of, a chemical injection pump and method for manufacturing same. The collar assembly secures to a thrust rod of the chemical injection pump and may include a circular member having a central opening and a second opening offset from the central opening. The second opening receives a central portion of a continuous U-shaped member, wherein fingerlike extensions at opposite ends of the U-shaped member flank a toggle element of a switching mechanism. The fingerlike extensions actuate the toggle element so as to stroke the chemical injection pump. The collar assembly includes a reduced number of parts and a simplified manufacturing process.