Extrusion track for blinds
OwnerTser-Wen Chouinventor
Life of this patent
Estimating the term…
Abstract
The improved system utilizes a track which has a bowed internal surface to prevent the wheel of the carrier from frictional engagement with the side of the track. The curved surface which faces the wheels will not be engaged by the wheels even where the carrier turns to one side or the other. This is accomplished while leaving the innermost portions of the raceway in the same width position with regard to the wheels as is usual to prevent the carrier from coming off-track. The tolerances for the inner corners of the raceway opposing the wheels may be reduced to further prevent the possibility of jamming in the track.
Claims11
An improved track for vertical blinds comprising:
- an elongate track having an overall inverted "U" transverse shape having a pair of opposing lower ends, and including a pair of opposing raceways each having an upwardly directed horizontal raceway surface and a downwardly directed horizontal raceway surface, said upwardly directed horizontal raceway surface and said downwardly directed horizontal raceway surface connected by a continuously curving internal wall surface.
An improved track for vertical blinds comprising:
- an elongate track having an overall inverted "U" transverse shape having a pair of opposing lower ends, and including a pair of opposing raceways each having an upper horizontal raceway surface bounded by an internally curved wall surface and wherein said track, from a transverse view, includes an upper relatively flat surface, a pair of recessed and downwardly extending side surfaces connected to the opposite sides of said upper relatively flat surface, a pair of horizontal surfaces each connected to a different one of said side surfaces, a first pair of curved downwardly extending side walls each connected to a different one of said pair of horizontal surfaces, a second pair of curved downwardly extending side walls each connected to a different one of said first pair of curved downwardly extending side walls, said second pair of curved downwardly extending side walls terminating in edges which oppose each other.
An improved track for vertical blinds comprising:
- an elongate track having bilateral symmetry about its transverse axis, each symmetrical half defining a horizontal upper surface, a recessed and downwardly extending side surface connected to said upper relatively flat surface, an upper horizontal surfaces connected to said side surface, a first curved downwardly extending side wall connected to said upper horizontal surface, a second curved downwardly extending side wall connected to said first curved downwardly extending side wall, and terminating in an inwardly disposed edge, and an inwardly disposed raceway extending from the connection of said first and said second curved downwardly extending side walls.
Dependencies are inferred from the claim text.