Abstract: A position-sensitive shock absorber is disclosed. The position-sensitive shock absorber includes a choking member positioned within the housing at a specific point along the stroke of the working piston that cooperates with the working piston to increase the resistance to fluid flow when the working piston reaches the specific point along its stroke thereby defining a second damping characteristic of the position-sensitive shock absorber from the specific point along the stroke of the working piston onward.

Abstract: A suspension assembly for a vehicle having an endless drive track is disclosed. The suspension assembly has a slide frame assembly and a rail extension assembly pivotably connected to a rear portion of the slide frame assembly and pivots about a first axis. The rail extension assembly is pivotable between a raised position and a lowered position with respect to the slide frame assembly. A spring biases the rail extension assembly toward the lowered position. The magnitude of the biasing force of the spring is adjustable. The rail extension assembly can be prevented from pivoting from the lowered position to the raised position independently of the magnitude of the biasing force.

Abstract: The shelving system has a number of electrically powered shelf units movable over ground, each shelf unit including an electronic circuit controlling the displacement of the shelf unit, a power cord connected to the shelf unit with of a power terminal rod, for feeding power to the shelf unit, and a network cable connected to the shelf unit with a network terminal rod, for allowing information to be exchanged with the electronic circuit. The shelving system further has a wire track that may be embedded in the ground, the wire track including an elongated main body having a hollow power wire channel housing the power cord and having an elongated opening allowing access to the power wire channel and forming an elongated power raceway allowing the power terminal rod to extend from the power wire channel to the shelf unit through the power raceway and to slide along the power raceway.