Abstract: A drive-on system for installing a tire chain (i.e., snow chain) on a pneumatic tire mounted on a vehicle wheel. The system includes a U-shaped installation tool whose arms releasably engage fastening elements (hooks or links) at one end of each side chain, and a installation tray or ramp in which the connected tire chain and tool are arranged, and may be stored, prior to installation, with the tire chain in a partially laid-out orientation and the tool preferably within a tool compartment in the tray. To install the tire chain, the vehicle is driven onto the tray and stopped, preferably in a predetermined optimum position in response to a signal initiated by a position-indicating switch on the tray. Then the tool, with one end of the tire chain connected to it and trailing it, is drawn upward and circumferentially around the tire.

Abstract: A drive-on system for installing a tire chain (i.e., snow chain) on a pneumatic tire mounted on a vehicle wheel. The system includes a U-shaped installation tool whose arms releasably engage fastening elements (hooks or links) at one end of each side chain, and a installation tray or ramp in which the connected tire chain and tool are arranged, and may be stored, prior to installation, with the tire chain in a partially laid-out orientation and the tool preferably within a tool compartment in the tray. To install the tire chain, the vehicle is driven onto the tray and stopped, preferably in a predetermined optimum position in response to a signal initiated by a position-indicating switch on the tray. Then the tool, with one end of the tire chain connected to it and trailing it, is drawn upward and circumferentially around the tire.

Abstract: A free-standing, self-supporting bed has a movable platform supported by a stationary frame. The platform may be elevated vertically to a stored position higher than head height when the bed is not in use. Counterweights allow the platform to be elevated and lowered with a minimum of effort. In the stored position the platform is suspended from the frame by redundant lines passing over pulleys. In the sleeping position the counterweights are suspended from the frame and the platform rests on the frame and may be secured thereto by latching devices operable from one side of the bed. The lines and pulleys are arranged so that the counterweights have a 2:1 mechanical advantage with respect to the platform and so that, during raising or lowering of the platform, forces keeping the ends of the platform horizontal are automatically exerted thereon.

Abstract: A free-standing, self-supporting bed has a movable platform supported by a stationary frame. The platform may be elevated vertically to a stored position higher than head height when the bed is not in use. Counterweights allow the platform to be elevated and lowered with a minimum of effort. In the stored position the platform is suspended from the frame by redundant lines passing over pulleys. In the sleeping position the counterweights are suspended from the frame and the platform rests on the frame and may be secured thereto by latching devices operable from one side of the bed. The lines and pulleys are arranged so that the counterweights have a 2:1 mechanical advantage with respect to the platform and so that, during raising or lowering of the platform, forces keeping the ends of the platform horizontal are automatically exerted thereon.