Patent ID: 6604428
Filing Date: 2003-08-12
Classification: G01L

Abstract:
A structure for Bourdon-tube gauge comprising:a casing with a test tip extending from the casing, a frame fixedly positioned in said casing and a needle gear and a limit bar respectively connected to said frame; a Bourdon tube is located in the casing and one end of said Bourdon tube connected to said test tip and the other end of said Bourdon tube connected to a link, and an indicator pivotally connected to said frame, a first end of said indicator pivotally connected to said link and a second end of said indicator having a rack portion which is engaged with said needle gear, the needle gear located at a circular track that the rack portion moves, and a concave portion defined in a side of said indicator and a protrusion portion extending from said side of said indicator, a first extreme position being defined when said concave portion is engaged with said limit bar, a second extreme position being defined when said protrusion portion is engaged with said limit bar, and a length of an arc that the rack portion of the indicator swings between the first and second extreme positions of the indicator is smaller than a length of the rack portion so as to ensure that the rack portion is engaged with the needle gear all the time.