Patent ID: 6758421
Filing Date: 2004-07-06
Classification: F02M

Abstract:
An armature lift assembly comprising:a body having an upstream end, a downstream end, and a longitudinal body channel extending therethrough along a longitudinal axis; an armature/needle assembly reciprocally disposed in the body along the longitudinal body channel; a first tube having an inner surface, an upstream end, a downstream end fixedly connected to the upstream end of the body, and a first tube channel; and a second tube having an outer surface, the second tube located within the first tube channel, the second tube having an upstream end and a downstream end, the downstream end of the second tube being spaced a distance from the upstream end of the armature/needle assembly approximately equal to a lift distance of the armature/needle assembly, the second tube being coupled to the first tube by a first circumferential coupling along the longitudinal axis and a second circumferential coupling along the longitudinal axis, and radially spaced apart between the inner and outer surfaces and between the first and second couplings is a volume of empty space between the respective inner and outer surfaces, the volume and the first and second couplings being disposed within the first tube channel, and the second circumferential surface coupling is contiguous to a non-magnetic shell along the longitudinal axis.