Measuring and testing – Liquid level or depth gauge – Float
Reexamination Certificate
1998-01-06
2001-05-15
Williams, Hezron (Department: 2856)
Measuring and testing
Liquid level or depth gauge
Float
C073S319000, C073SDIG005
Reexamination Certificate
active
06230561
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates a float for a level sensor, particularly to one applicable to various types of level sensors by combining its components in various ways without any extra processes or modifications.
A level sensor is indispensable in a large tank or a drink water dispenser for sensing the level of water in its tank so as to prevent water from being used up and subsequent danger from happening. And then a proper warning may be given out or electricity is cut off at once in that case.
A conventional level sensor shown in
FIGS. 7 and 8
includes a magnetic tube
10
combined with a float
11
so that the float may activate the magnetic tube by up-and-down movement together with the level of water rising and falling so as to keep a tank in a safe condition.
The magnetic tube
10
may have different designs according to different activating points of a magnet such as illustrated in the figure, having a spring
101
surrounded by a small magnet ring
102
as an activating point for a magnet ring
12
on the float
11
. The float
11
is cylindrical, having a center through hole
110
for the tube
10
to extend therein, an annular hollow space
111
opening downward. An annular groove
112
is provided in the lower open mouth of the annular hollow space
111
for fitting a magnet ring
12
therein, and two gaskets
13
,
14
of different diameter are also fitted in the annular groove
112
. Then an annular cap
15
provided with an inner groove
151
and an outer annular groove
152
is closed on the gaskets
13
,
14
engaging the inner and the outer annular groove
151
,
152
, fixed securely in the annular groove
112
.
In using the conventional level sensor, the float
11
is combined with the magnetic tube
10
, moving up and down together with the level of water in a tank. When the float
11
moves near a certain point of the magnetic tube
10
, the magnet ring
12
in the float will activate the magnet switch (not shown) to generate electric current so as to give out a signal for controlling the switch of a power source or other actions. As the float is of a definite form and shape, hardly applicable to other types of magnetic tubes
10
. So a new type of float has to be made to suit to other types of level sensors, increasing production cost for makers.
SUMMARY OF THE INVENTION
This invention has been devised to offer a float for a level sensor, applicable to various types of level sensors by changing combination of its own components without any extra processes or modifications.
A feature of the invention is a position limiting oval hole formed in an upper portion of a center through hole of a float and having a larger diameter than the center through hole for placing an oval base provided with a magnet ring.
Another feature of the invention is a magnet ring fitted in a lower portion of an annular hollow space formed in the float and opening downward.
One more feature of the invention is an inner and an outer gasket fitted under the magnet ring in the lower portion of the annular hollow space and closed up by an annular cap to make this float water-tight.
REFERENCES:
patent: 4398186 (1983-08-01), Statz
patent: 5041812 (1991-08-01), Misaizu et al.
patent: 5374790 (1994-12-01), Horvath
patent: 5886312 (1999-03-01), Barmore, Jr. et al.
Rosenberg , Klein & Lee
Williams Hezron
Wilson Katina M
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