Measuring and testing – Test stand – For engine
Reexamination Certificate
1998-12-16
2001-02-13
Fuller, Benjamin R. (Department: 2855)
Measuring and testing
Test stand
For engine
C073S313000
Reexamination Certificate
active
06185994
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an oil level detector for use in an oil tank of a vehicle to detect the level of oil, and more particularly to such an oil level detector which has means to effectively prohibit oil from passing to its inside.
FIG. 4
illustrates an oil level detector according to the prior art. This structure of oil level detector comprises a flat, circular holder base
5
having a tube
52
at the bottom side and a top block
51
at the top side, a top cover
6
covered on the top block
51
, a float
53
mounted around and moved vertically along the tube
52
, a detecting circuit board
8
mounted in the bore
521
of the tube
52
, and a screw cap
7
mounted with a rubber ring
71
and threaded into the inner thread
522
at the bottom end of the tube
52
. The lead wires
81
of the detecting circuit board
8
are extended out of a hole
511
at the top block
51
and a hole
61
at the top cover
6
, and connected to power source. This structure of oil level detector is still not satisfactory in function. Because oil may permeate through the gaps between the inner thread
522
of the tube
52
and the threaded periphery of the screw cap
7
, the detecting circuit board
8
tends to be damaged by oil leaked in the tube
52
. Further gas or moisture may permeate through the holes
61
,
511
to the inside of the tube
52
to damage the detecting circuit board
8
. There is known a similar oil level detector in which the tube which holds the detecting circuit board on the inside is a close-end tube directly injection-molded from plastics. Because the bottom end of the tube is a closed end, oil is prohibited from leaking in the tube. However, the plastic material property of the tube will be damaged a certain period of time after dipping in oil, causing oil to leak in the tube through damaged structure of the tube.
SUMMARY OF THE INVENTION
The present invention has been accomplished to provide an oil level detector which eliminates the aforesaid problems. According to one aspect of the present invention, an insulative sleeve is mounted in the tube of the holder base with both ends well sealed by a respective sealing cap to hold the detecting circuit board on the inside, and the tube which holds the insulative sleeve inside the holder base is an anticorrosive close-end tube. According to another aspect of the present invention, the sealing cap which seals the top end of the sleeve is forced into tight engagement with the inner diameter of the tube when the sleeve is installed in the tube, causing the top end of the tube to be water-proof.
REFERENCES:
patent: 2473581 (1949-06-01), Ford
patent: 5097976 (1992-03-01), Zink et al.
patent: 5862702 (1999-01-01), Liang
patent: 1563100 (1968-12-01), None
Fuller Benjamin R.
Rosenberg , Klein & Lee
Stevens Maurice
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