Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
October 6, 2015
Patent Application Number
12249282
Date Filed
October 10, 2008
Patent Primary Examiner
Patent abstract
An expansion/compression mechanism of a piston rod assembly is composed of a bush shaft, a first cylindrical piston rod that is screwed with the bush shaft, a second cylindrical piston rod that is screwed with the first piston rod, and a piston rod holding member for housing the bush shaft and these piston rods. Therefore, the piston rods move linearly in multiple stages.
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