Pick-up head for surface cleaning apparatus
First Claim
1. In an elongated, downwardly opening pick-up head for an air flow surface cleaning apparatus adapted for movement over a surface to be cleaned and extending transversely of the direction of movement thereof, with said pick-up head having a top wall connected to depending side walls and with one end portion of said pick-up head communicating with the pressure side of an air circulating means and the other end portion thereof communicating with the suction side of said air circulating means,(a) an elongated horizontal baffle extending between said depending side walls of said pick-up head in spaced relation to said top wall and defining an upper passageway having an inlet in communication with said pressure side of said air circulating means and an outlet in communication with said suction side thereof and defining a lower passageway between said baffle and the surface to be cleaned having an inlet communicating with said pressure side of said air circulating means and an outlet communicating with said suction side thereof and with the outlets of said upper and lower passageways discharging into a common conduit communicating with said suction side, and(b) the cross sectional area of said outlet for said upper passageway being restricted so that the velocity of air passing therefrom is increased to create a venturi effect which aids in drawing air from said lower passageway into said common conduit.
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Accused Products
Abstract
A pick-up head for surface cleaning apparatus embodies a horizontal baffle extending between depending side walls of an elongated, downwardly opening chamber. Upper and lower horizontally extending air flow passageways are defined by the baffle within the pick-up head, with air in the lower passageway flowing over and contacting a surface to be cleaned. The upper passageway is restricted at its outlet to create a venturi effect as air passes therefrom. The venturi effect aids in drawing air carrying dirt and debris into the pick-up head.
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Citations
8 Claims
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1. In an elongated, downwardly opening pick-up head for an air flow surface cleaning apparatus adapted for movement over a surface to be cleaned and extending transversely of the direction of movement thereof, with said pick-up head having a top wall connected to depending side walls and with one end portion of said pick-up head communicating with the pressure side of an air circulating means and the other end portion thereof communicating with the suction side of said air circulating means,
(a) an elongated horizontal baffle extending between said depending side walls of said pick-up head in spaced relation to said top wall and defining an upper passageway having an inlet in communication with said pressure side of said air circulating means and an outlet in communication with said suction side thereof and defining a lower passageway between said baffle and the surface to be cleaned having an inlet communicating with said pressure side of said air circulating means and an outlet communicating with said suction side thereof and with the outlets of said upper and lower passageways discharging into a common conduit communicating with said suction side, and (b) the cross sectional area of said outlet for said upper passageway being restricted so that the velocity of air passing therefrom is increased to create a venturi effect which aids in drawing air from said lower passageway into said common conduit.
Specification