Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1994-03-25
1996-03-12
Scherbel, David
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
151444, 15322, 15339, 15365, 15367, 15393, 15401, 15414, 401 25, 401 13, 401139, 401140, 401266, A47L 700, A47L 902, A47L 500, A47L 108
Patent
active
054975301
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a wiper device for hard surfaces, in particular a window wiper, comprising a slit-shaped suction nozzle, a flexible wiper lip being arranged on the nozzle and protruding forwardly beyond the suction nozzle.
A window wiper of this type is known, for example, from German Utility Model No. 80 19 169. In this case, a foamed rubber-type wiper pad is located in a slit-like suction nozzle and, in addition, a wiper lip is arranged next to the wiper pad and independently of the slit nozzle. The suction effect in this known device is hindered by the foamed rubber-type wiper pad in the suction nozzle and so a suction unit having a particularly high power capacity is necessary to maintain the required suction stream.
The object of the invention is to improve a wiper device of the generic type such that the required suction capacity of the suction unit is reduced while, on the other hand, an improved wiping and cleaning action can be achieved. This object is accomplished in accordance with the invention, in a wiper device for hard surfaces of the type described at the outset, in that the wiper lip is held on a wall of the suction nozzle and is drawn against the opposite wall of the suction nozzle under the influence of a suction stream in the suction nozzle and thereby closes the suction nozzle.
In the new wiper device the suction nozzle is, therefore, normally open so that the suction stream can pass unhindered into the suction nozzle. As long as the wiper device rests on the window surface to be cleaned, the wiper lip is bent back such that the suction opening is opened. If, on the other hand, the wiper device is removed from the surface to be cleaned, the suction stream now sucks the free wiper lip onto the opposite wall and thereby closes the suction opening. This has, on the one hand, the advantage that when the device is not in use and the suction opening therefore closed the required suction capacity of a suction unit attached to the wiper device is reduced and, on the other hand, liquid is reliably prevented from reaching the outside from the interior of the wiper device, even when the user holds the wiper device with the suction nozzle facing downwards.
It is particularly advantageous for the wiper lip to project through the suction nozzle, whereby it is preferably arranged in its undeformed state between the two walls defining the suction nozzle. This means that the wiper lip can be bent up in one direction out of its undeformed rest position when it abuts on the surface to be cleaned whereas it is bent in the other direction, in which it closes the suction opening, when the wiper device is not in use and the suction unit is switched on. In a preferred embodiment, the wall mounting the wiper lip bears a support surface which extends towards the front edge of the wiper lip and on which the wiper lip abuts when it is deformed towards a complete opening of the suction nozzle. This means that the movement of the wiper lip is limited in opening position. The wiper lip, which rests on the surface to be cleaned with a front edge when it is drawn down this surface, is supported on the support surface in this way with its rear side so that the user can exactly meter the force with which the front edge of the wiper lip rests on the surface to be cleaned even though the wiper lip consists of a flexible material.
In this respect, it is advantageous for the support surface to extend almost as far as the front edge of the wiper lip.
The support surface is preferably curved convexly towards the front edge of the wiper lip so that the wiper lip is not bent over sharply at any point. This promotes the flow properties of the suction stream in the region of the suction opening; in this way turbulences in this region are avoided.
The front edge of the support surface and the front edge of the opposite wall are preferably arranged approximately opposite one another. They therefore form the slit-like suction opening between them, whereby the suction opening is constricted at one wall due to the wiper lip r
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De Filippo Antonio
Kamm Roland
Lammons Carl S.
Murray Donald W.
Schneider Josef
Alfred Karcher GmbH & Co.
Chin Randall E.
Lipsitz Barry R.
Scherbel David
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