Signals and indicators – Indicators – Magnetically actuated
Patent
1988-04-05
1989-09-19
Cuchlinski, Jr., William A.
Signals and indicators
Indicators
Magnetically actuated
116221, 116267, 116DIG25, 116DIG42, G01D 512
Patent
active
048670952
ABSTRACT:
A cartridge style, pop up, differential pressure indicator includes a threaded body member, a cover structure and a cylindrical indicator button, which carries a magnet at its lower end, and is slidably supported in the cover for movement between a depressed, hidden position and an extended indicating position. The button is engaged at one side by a leaf spring which in the depressed position urges a lip on the button under a ledge in the cover to serve as a detent. A piston slidably supported in the body is subject to differential fluid pressures and carries a magnet at its upper end, poled in a manner to repel the magnet in the indicator button to urge the latter against the bias of the detent spring and upwardly to the extended, indicating position. A semicircular bimetal strip supported in the cover engages the detent spring at lower temperatures to prevent false release of the indicator button due to cold weather, high fluid viscosity situations.
REFERENCES:
patent: 2942572 (1960-06-01), Pall
patent: 3064618 (1962-11-01), Scavuzzo
patent: 3077854 (1963-02-01), Pall
patent: 3212471 (1965-10-01), Willis
patent: 3232266 (1966-02-01), Levesque
patent: 3364897 (1968-01-01), Mouwen
patent: 3402690 (1968-09-01), Willis
patent: 3442248 (1969-05-01), Parkinson et al.
patent: 3595200 (1971-07-01), Cilento
patent: 3841259 (1974-10-01), Parkinson et al.
patent: 3873795 (1975-03-01), Leighton et al.
patent: 4029042 (1977-06-01), Juhasz
patent: 4172971 (1979-10-01), Silverwater et al.
patent: 4729339 (1988-03-01), Whiting
patent: 4745876 (1988-05-01), Whiting
Cella Albert F.
Conner Wayne L.
Leady Keith D.
Shane Bruce E.
Cuchlinski Jr. William A.
Hohenshell Jeffrey
Jocke Ralph E.
Parker Hannifin Corporation
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