Pressure indicator

Details Pressure indicator Pressure indicator

2006-05-16

2006-05-16

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Fluid pressure gauge

Photoelectric

Reexamination Certificate

active

07043992

ABSTRACT:
A pressure indicator comprising a piston which is displaceably mounted in a housing counter to the pressure of a spring on an axis and which can be impinged upon with pressure which is to be measured; also comprising optical display means actively cooperating with the piston. According to the invention, the structure of the indicator is simplified, compact and robust. This is achieved in that the optical display means comprise a front glass arranged perpendicular to the axis and one or several display elements which can be moved by the piston relative to said front glass and which respectively alternate at various pressures between a first position wherein they are optically visible from outside through the front glass and a second position wherein they are not optically visible from outside through the front glass.

REFERENCES:
patent: 3592218 (1971-07-01), Guy
patent: 4147431 (1979-04-01), Mann
patent: 5014786 (1991-05-01), Kobayashi
patent: 5027740 (1991-07-01), Kramer et al.
patent: 5189979 (1993-03-01), Popenoe
patent: 5213057 (1993-05-01), Müeller
patent: 5339764 (1994-08-01), Singbartl
patent: 5877426 (1999-03-01), Hay et al.
patent: 6626043 (2003-09-01), Bailey et al.
patent: 6877378 (2005-04-01), Bailey et al.

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