Fluid level indicator

Details Fluid level indicator Fluid level indicator

1999-12-13

2000-09-26

Freay, Charles G.

Pumps

Condition responsive control of pump drive motor

Responsive to accumulation of pumped liquid in receiver

169DIG1, 733225, F04B 4904

Patent

active

061235083

ABSTRACT:
Apparatus is provided for indicating when the water level rises to a predetermined height, of the type that includes a float assembly (44) with a float that rises along a guide of a fixed housing assembly (40) until an activator (74) on the float assembly activates a switch (70) on the housing assembly. The guide is in the form of a downwardly-extending post (42), and the float assembly includes a hollow shaft (52) that extends upwardly from the float and that surrounds the post. As a result, the sliding surfaces (60, 62) along which the float assembly slides upwardly along the post, is isolated from the environment to ensure reliable sliding despite a hostile environment that could damage any exposed sliding surfaces and prevent reliable sliding.

REFERENCES:
patent: 3442219 (1969-05-01), Fitzgerald
patent: 3829636 (1974-08-01), Scott
patent: 3963376 (1976-06-01), Miskin
patent: 4081639 (1978-03-01), Tice
patent: 4441860 (1984-04-01), Tsujimoto
patent: 4805066 (1989-02-01), Mergenthaler
patent: 4943210 (1990-07-01), Bailey, Jr. et al.
patent: 5155311 (1992-10-01), Utke
patent: 5562422 (1996-10-01), Ganzon et al.
patent: 5586466 (1996-12-01), Steiner
patent: 5900546 (1999-05-01), Wilkins

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