Abstract: A bidirectional flow control valve for use in a hydraulic system to regulate fluid flow in either direction of flow through the valve. The valve includes a housing, a slidable sleeve, two opposite springs, and two opposite cap nuts. The housing has a bore and a sidewall with first ports located adjacent to one end and second ports located adjacent to the other end. The slidable sleeve has an interior wall disposed therein to form a first chamber and a second chamber. The interior wall has an axial port to permit flow of fluid therethrough. The first spring is disposed within the first chamber of the slidable sleeve and constrained therein by the cap nut. The second spring has the same tension as the first spring and disposed within the second chamber of the slidable sleeve and constrained therein by the cap nut. The slidable sleeve is self-adjustable to an equilibrium position within the valve housing to at least partially open the first and second ports of the valve housing.

Abstract: An unity arm lever adaptor for use with a powered vehicular wheelchair lift. The unity arm lever adaptor is adapted for connecting together to a handrail, a vertical arm, a saddle or roller, and a vertical link of the wheelchair lift. The arm lever adaptor has an extended adaptor section, an elongated main section, and a pivotable yoke section. The main section has a pivotable end which is remote from the yoke section but adjacent to the extended adaptor section. The extended adaptor section is inserted through an opening on the vertical arm for adapting and securing to an end of the handrail. The pivotable end is pivotably connected to the vertical arm. The yoke section is pivotably connected to the saddle and the vertical link.

Abstract: A removable vehicle seat is provided that allows for easy removal and reattachment of a vehicle seat to the floor of a vehicle. The design provides a simple structure which permits quick removal and reattachment by a single person but which is stable enough to remain attached to the vehicle floor in the event of an auto accident. The removable vehicle seat is particularly useful for vehicles which are utilized for transporting disabled persons in that removal of the vehicle seats allows for opening up space in a vehicle required for use by persons in wheelchairs.