Patent ID: 6823751
Filing Date: 2004-11-30
Classification: F16L

Abstract:
A sphere or pig detection switch assembly adapted for being mounted on a pipe through which the sphere or pig will run, said detection switch assembly comprising;An elongated, hollow main body portion presenting an elongated chamber therein, said body portion defining a detection zone positioned in said chamber and including mounting structure for a detection element including a detection surface to be mounted adjacent said zone; an elongated probe shaft disposed mainly within said chamber, said probe shaft including a centrally disposed activation portion, said probe shaft being longitudinally moveable within said chamber from a first position with said activation portion spaced from said zone to a second position with said activation portion at said zone, said probe shaft including an inner terminal end that protrudes into a pipe upon which the detection switch assembly is mounted when the probe shaft is in its first position, said inner terminal end being configured, arranged and positioned so that it will be contacted and pushed toward said chamber by a pig or sphere running along a pipe upon which the switch assembly is mounted, whereby to cause said probe shaft to move from said first position to said second position; and a wiper element carried by the probe shaft in a position to wipe debris from a detection surface positioned adjacent said zone as the probe shaft moves from said first position to said second position under the influence of contact between a pig or sphere and said inner terminal end of the probe shaft.