Pumps – With signal – indicator – or inspection means
Patent
1992-07-06
1993-11-02
Gluck, Richard E.
Pumps
With signal, indicator, or inspection means
4174233, 417435, G01F 2362, B60S 150
Patent
active
052579115
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The object of the present invention is a windscreen washer pump provided with a level sensing device applicable to the equipment for cleaning the windscreens, rear screens and headlamps of motor vehicles.
BACKGROUND OF THE INVENTION
The equipment for the cleaning of the above mentioned glass surfaces, usually included as original equipment in motor vehicles, comprises, among other items as is well known, a pump which is adapted to a reservoir containing cleaning liquid and which pumps this liquid through tubing and sprays it over the said surfaces at a rate and with a pressure adapted to the needs of each particular application.
These pumps are driven by a d.c. electric motor which is connected through the corresponding protection and control members to the vehicle battery. Under these conditions, the pump is set running by way of the said control members disposed inside the vehicle and operated by the driver depending on the driving conditions of the vehicle.
From the foregoing, it has appeared necessary, for safety reasons, to keep a check over the amount of cleaning liquid available in the said auxiliary reservoir. This control consists normally of an optical and/or acoustical alarm signal, which is disposed in an appropriate place in the vehicle interior and which is operated by a device associated with the cleaning liquid reservoir.
In this way, the said signal indicates, on being activated, that the level of cleaning liquid in the reservoir has dropped to the preset minimum level.
The known embodiments of devices for controlling the level of cleaning liquid in the reservoir:
include devices which may be coupled, independently of the pump, to the cleaning liquid reservoir and which are operatively based on the action of a float on a reed relay; and also
devices which may be integrated in the structure of the pump itself.
Among the latter, there may be mentioned the device disclosed in Spanish patent P.9000819 for "A control device for liquid levels", which operates by means of a continuity sensor which detects the presence of cleaning liquid in terms of the passage of a weak electric current through said liquid and which is connected to a reversing circuit and to an amplifying circuit which operates on the above mentioned signalling members.
Generally speaking, the known embodiments of such control devices integrated in the pump structure suffer from drawbacks relating to the high production costs and poor stability of the signal when the cleaning liquid level is substantially below the level chosen as limit for activation thereof.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a windscreen washer pump with a level sensing device, which avoids the disadvantages of the prior art.
More particularly, it is an object of the present invention to provide as windscreen washer pump with a level sensing device having integrated in the structure thereof a cleaning liquid level control which, when compared with the known embodiments, on the one hand reduces production costs and, on the other hand, notably increases the stability of the signal indicating that the cleaning liquid contained in the reservoir is at a level substantially below the preset minimum level.
In keeping with these objects and with others which will become apparent hereinafter one feature of the present invention resides in a pump for windscreen washers having a level sensing device of new construction.
The windscreen washer pump provided with the level sensing device of the invention is formed, essentially, by an approximately cylindrical casing which comprises a pump body member and a rear cover, which may be fixedly connected together by the corresponding mechanical means. Said pump body member is provided, at one end thereof, with an axial tubular cleaning liquid suction extension, a pumping chamber housing the suction-discharge impeller, a discharge nozzle disposed tangentially in the pumping chamber through which the cleaning liquid sucked by the impeller is discha
REFERENCES:
patent: 3593267 (1971-07-01), Klein
patent: 3941073 (1976-03-01), Ridgeway
patent: 4456432 (1984-06-01), Mannino
patent: 4934914 (1990-06-01), Kabayashi et al.
Patent Abstracts of Japan, vol. 10, No. 167 (M-488)(2223).
Patent Abstracts of Japan, vol. 12, No. 192 (P-172).
Morales Jose L.
Mota Miguel
Gluck Richard E.
Striker Michael J.
Transpar Iberica S.A.
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