Power plants – Pressure fluid source and motor – Pulsator
Patent
1989-07-27
1991-09-10
Look, Edward K.
Power plants
Pressure fluid source and motor
Pulsator
60534, 60545, 200 82D, 3404501, 340452, 340459, F15B 700, H01H 3538, B60Q 1100
Patent
active
050463136
ABSTRACT:
A master cylinder (12) having a switch (70) which is activated by either a magnet (78) carried by a float (76) in a reservoir (40) or a pin (66) moved by a differential area piston (52). The switch (70) had a first blade (82) connected a source of electrical current (106) through an indicator light (124) and a second blade (88) connected to an electrical ground (114). A reed switch (100) is connected to the first (82) and second (88) blades and responds to the magnet to close an electrical circuit to operate the indicator light (124) if a low fluid level is present in the reservoir (40). A first contact (96) on the first blade (82) is positioned in switch 70 by a non-electrical conductive actuation pin (66) that extends through the housing (22) of the master cylinder (12). A second contact (94) on the second blade ( 88) has a projection (92) that engages the housing (22) of the master cylinder (12) to define a fixed location for the first contact (94) and establish a fixed gap between the first (94) and second (96) contacts. If a pressure differential is created in the master cylinder (12) between the fluid pressure supplied to operate the wheel brakes (18) and (20), the differential area piston (52) moves and brings the second contact (96) into engagement with the first contact (94) to close the electrical circuit and activate the indicator light (124).
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Crumb Donald A.
Dillon, Jr. William F.
Gaiser Robert F.
Zander Richard A.
Allied-Signal Inc.
Decker Ken C.
Look Edward K.
McCormick Jr. Leo H.
Ryznic John
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