Abstract: An air cushion having a first and second set of flexible air chambers providing alternative up and down motion when inflated and deflated, wherein each set of air chambers includes a primary channel branching into a plurality of secondary channels. An air supply device is connected to the two sets of air chambers for alternatively inflating and deflating each said set of air chambers. The secondary channels are arranged in an alternative manner to provide alternate up and down motion. The primary channel is connected with each of the secondary channels and conducts air directly between the secondary channels and an air supply device.

Abstract: A pet shelter divided into a plurality of compartments of different interior temperatures with a temperature control device for controlling the temperature in the pet shelter, such that the interior temperatures change progressively across the compartments to blend into the temperature of the outside environment.

Abstract: A lighted-sign stand comprises a body having a base supporting a sign on a horizontal surface. The body of the stand has a sign panel and a frame for holding the sign. The stand further comprises a light source and a control circuit. The control circuit having a sensor at the base of the stand for turning the light source off and on, respectively, turning the light source off when the base is supporting the sign on a horizontal surface and turning the light source on when the base is lifted off the horizontal surface.