Motorized window shades for RVs
A motorized shade assembly is provided having a discontinuous web extending between two rollers, one of which is motorized and the other is tensioned or biased toward rotation away from the other roller. The roller motor can be mounted inside of one of the rollers, and the tensioning device, such as a torsion spring, can be mounted inside of the other roller. The web includes a shade portion and a strap portion, with a rigid draw bar at the junction of those portions. Rotation of the rollers causes the strap portion to wrap over one of the rollers as the shade portion unwraps from the other roller. The shade assembly can be positioned between an inclined or curved vehicle window and an interior shroud for the window, such as found with a cab-over window of a Class B motorhome. The draw bar and fasteners connecting the strap to the draw bar facilitate movement of the shade when in contact with the shroud. Friction reducing tape or surface treatment on the periphery of the window opening in the shroud can also facilitate movement of the shade when in contact with the shroud. Motor actuation can be hardwired to a desired location within the vehicle, or wirelessly controlled by the user, as with an RF device.
1. A shade arrangement comprising:
an upper roller,
a shade web attached to the upper roller,
a draw bar attached to the shade web,
at least one strap attached to the draw bar,
a lower roller attached to the strap,
a motor mounted inside of the upper roller, wherein the upper roller is configured to be driven by the motor to rotate and thereby wind and unwind the shade web onto the upper roller, according to a direction of rotation of the motor,
a torsion spring mounted inside of the lower roller, wherein the lower roller is biased to rotate and thereby wind or unwind the strap onto the lower roller, according to the direction of rotation of the motor,
a rigid frame into which the upper roller and the lower roller are mounted at spaced apart locations,
a window and a window shroud mounted adjacent to the window, the window shroud having an opening therein which corresponds with a location and dimension of the window, and the rigid frame is mounted therebetween with the upper roller and the lower roller positioned above and below the window respectively,
a vehicle having a window opening into which the window is mounted such that a plane of the window is at an angle to a horizontal plane of reference for the vehicle,
wherein the shade web overlays the opening of the window shroud, and the opening of the window shroud includes a friction reducing means over at least a portion of a periphery of the window shroud upon which the draw bar and portions of the shade web can slide.
2. The shade arrangement according to claim 1 wherein the strap is attached to the draw bar by a fastener having a raised portion, the raised portion being mounted on a side of the strap adjacent to the window shroud.
3. The shade arrangement according to claim 2 wherein the strap comprises a first strap and a second strap, each of the first and second straps attached to the draw bar and the lower roller, the first and second straps being spaced apart and located no closer to each other than a width of the opening of the window shroud, each of the first and second straps being connected to the draw bar by the fastener respectively, the raised portion of each said fastener having a surface and dimension formed so as to facilitate motion of the draw bar past the periphery of the opening of the window shroud.