Abstract: A device for signalling a predetermined height of fluid within a switching device is disclosed. The device includes a container having a first section, a second section, and a novel sealing assembly (operatively associated with the first and the second section) for sealing the fluid within the container. The device further includes a sphere, shaft and torque tube assembly (operatively associated with the first section) for measuring the fluid within the container, as well as valve member (operatively associated with the fluid level means) adapted for controlling a supply source. The device may be used as a high level switch or a low level switch, and is adaptable for pneumatic or electrical systems.

Abstract: A steerable, powered wheelchair with a mobile base, and two movable arms that are attached to a seat. The seat is attached to the arms with pivots that permit rotation of the seat in both vertical and horizontal planes. The arms can move through three positions. The first position is the at rest position. Here, the seat rests near or directly on the base. In the second position, the seat is spaced vertically above the mobile base. In the third position, the seat is extended forward of the mobile base 2 and can drop down to floor or ground level. A feature of the mobile base it that when the seat is in the third position, the mobile base can rotate vertically about the front wheels. This allows the wheelchair to run on two wheels, increasing the wheelchair's angular mobility. In this operational mode, the user can exercise his or her legs by bouncing them against the ground.