DEVICE TO SHUT OFF VALVES OF DOWN-HOLE SAMPLER Russian patent published in 2002 - IPC

FIELD: examination of holes, taking samples of fluid with dissolved gas. SUBSTANCE: device has mobile rod, control unit that includes latches spring-loaded by laminated spring and fixing unit including pressure bushing, fixing arms anchored in it and limiters of their displacement. Middle part of mobile rod has annular grooves located in symmetry with regard to axis of device and terminating in through groove in lower part. Control unit has tip made fast to mobile rod. Laminated spring is positioned in through groove of mobile rod. Each latch in upper part comes in the form of wedge catch and is mobile in horizontal plane with reference to axis of device and made fast by tip in lower part. Fixing unit has guiding bushing put freely on mobile rod which internal part has circular groove which fixes wedge catches of each latch. Body of guiding bushing has through holes arranged in symmetry to accommodate fixing arms. Pressure bushing is put freely on mobile rod with formation of mobile link together with guiding bushing and its internal part is conical, reciprocal of location seats of latches, and connection bushing put freely on mobile rod in upper part and made fast to guiding bushing. In this case its outer lower surface is conical to accommodate fixing arms and limiter of displacement of fixing arms comes in the form of bushing put on mobile rod fixed. EFFECT: increased functional reliability of structure. 2 dwg