Windshield washing system, especially for motor vehicles
First Claim
1. In a windshield washing system, especially for motor vehicles, comprising a feed pipe connected at one end to at least one washing jet, and intermediately operable pump means connected to the other end of said feed pipe for pumping washing fluid through said pipe to said jet upon operation of said pump means and for maintaining washing fluid in said pipe between successive operations of said pump means;
- the improvement comprising control means selectively positionable in either of a first or a second position, said control means being operable in said first position to drain fluid from at least that portion of said feed pipe adjacent said one end and being operable in its second position to prevent drainage of fluid from said portion of said feed pipe.
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Accused Products
Abstract
A windshield washing system for motor vehicles is described in which a non-return valve is installed into the feed pipe, which non-return valve, for ensuring a quick response from the washing system, prevents the feed pipe from emptying, while the pump is switched off. According to the invention a bypass switchable via a valve runs parallelly to this non-return valve, which bypass is opened in winter, i.e. in low outdoor temperatures, but is closed in summer. Consequently during winter mode of operation the feed pipe is emptied. Thus the washing liquid is prevented from freezing.
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Citations
6 Claims
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1. In a windshield washing system, especially for motor vehicles, comprising a feed pipe connected at one end to at least one washing jet, and intermediately operable pump means connected to the other end of said feed pipe for pumping washing fluid through said pipe to said jet upon operation of said pump means and for maintaining washing fluid in said pipe between successive operations of said pump means;
- the improvement comprising control means selectively positionable in either of a first or a second position, said control means being operable in said first position to drain fluid from at least that portion of said feed pipe adjacent said one end and being operable in its second position to prevent drainage of fluid from said portion of said feed pipe.
- View Dependent Claims (2, 3, 4, 5, 6)
Specification