Windscreen wipers

Claim 1

A device for continuously removing liquid from a windscreen, comprising: drive means for rotating a blade at a wiping speed such that the blade becomes effectively invisible; a blade support guidance and rotation hub attached to said drive means for being rotated thereby; a carrier for a blade, said carrier being connected to said hub and being positioned over the windscreen, means supporting said carrier for free rotation along with said hub and for free axial movement of said carrier toward and away from the windscreen; a cam connection between said hub and said blade carrier, comprising driving dogs on said hub extending rearwardly toward said carrier; one surface of each said dog being inclined from said axial movement of said carrier, slots correspondingly spaced around and shaped to said dogs on said carrier into which said dogs extend and a cooperating wall that defines each said slot cooperating and engaging with said inclined surface of the respective one of said dog; at least one blade of unitary construction connected to said carrier to be rotated thereby and to move and shift therewith; the entire said blade being formed of a transparent material; said blade having an integrally formed leading edge which is on the front of said blade with respect to the motion of said blade; said blade being so disposed and arranged that during rotation thereof said integrally formed blade leading edge contacts the windscreen to scrape liquid therefrom; whereby when said hub is rotated, said carrier and said blade are urged axially against the windscreen and said walls defining said slots ride up said dogs, while when rotation of said hub is ceased, said blade carrier returns automatically to the inoperative position of said blades wherein said walls of said slots ride down said dogs and said blade thereby moves away from the windscreen.

Claim 2

A device for continuously removing liquid from a windscreen, comprising: drive means for rotating a blade at a wiping speed such that the blade becomes effectively invisible; a blade support guidance and rotation hub attached to said drive means for being rotated thereby; a carrier for a blade, said carrier being connected to said hub and being positioned over the windscreen, means supporting said carrier for free rotation along with said hub and for free axial movement of said carrier toward and away from the windscreen; a cam connection between said hub and said blade carrier, comprising driving dogs on said hub extending rearwardly toward said carrier; one surface of each said dog being inclined from said axial movement of said carrier, slots correspondingly spaced around and shaped to said dogs on said carrier into which said dogs extend and a cooperating wall that defines each said slot cooperating and engaging with said inclined surface of the respective one of said dog; at least one blade of unitary construction connected to said carrier to be rotated thereby and to move and shift therewith; the entire said blade being formed of a transparent material; said blade having an integrally formed leading edge which is on the front of said blade with respect to the motion of said blade; said blade being so disposed and arranged that during rotation thereof said integrally formed blade leading edge contacts the windscreen to scrape liquid therefrom; whereby when said hub is rotated, said carrier and said blade are urged axially against the windscreen and said walls defining said slots ride up said dogs, while when rotation of said hub is ceased, said blade carrier returns automatically to the inoperative position of said blades wherein said walls of said slots ride down said dogs and said blade thereby moves away from the windscreen.