Measuring and testing – Blower – pump – and hydraulic equipment
Reexamination Certificate
2005-09-06
2005-09-06
Williams, Hezron (Department: 2856)
Measuring and testing
Blower, pump, and hydraulic equipment
C073S168000, C303S119200, C303S119300
Reexamination Certificate
active
06938471
ABSTRACT:
A method is provided for measuring a pressure of a hydraulic fluid that is supplied from a hydraulic fluid control device (1) to a operation device (6). The method includes measurement of a first pressure (Pm) and a second pressure (Pa). The first pressure is the pressure of the hydraulic fluid within a first flow path (P3to P8) connecting a pressure control unit (3) and the operation device. The second pressure is the pressure of the hydraulic fluid within a second flow path (P11, P12) connecting an accumulator (22) and the pressure control unit. Then, a stabilization time (T) is determined. The stabilization time is the time when a pressure gradient per unit time of the second pressure become to be smaller than a predetermined value. Thereafter, a pressure (Pw) of the hydraulic fluid at the operation device is determined based on the first pressure that is measured at the stabilization time or at a time immediately after the stabilization time. This measuring methods can be used for evaluating a condition of the hydraulic fluid.
REFERENCES:
patent: 2926965 (1960-03-01), Wilson et al.
patent: 4538228 (1985-08-01), Brearey et al.
patent: 4807945 (1989-02-01), Budecker et al.
patent: 4811252 (1989-03-01), Furuse
patent: 5127712 (1992-07-01), Rizk et al.
patent: 5462343 (1995-10-01), Yoshida et al.
patent: 6126248 (2000-10-01), Kawahata et al.
patent: RE37151 (2001-05-01), LaFountain
patent: 6247765 (2001-06-01), Oyama
patent: 63-46959 (1988-02-01), None
Advics Co., Ltd.
Burns Doane , Swecker, Mathis LLP
Jackson André K.
Williams Hezron
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