231results about How to "Limit distance" patented technology

Spinal stabilization devices, systems and methods are provided that include a stabilization member including a first structural member that mounts to a pedicle screw, a second structural member adjacent the first structural member and that can move away therefrom, a resilient element mounted between the structural members and that elongates to accommodate relative movement therebetween, and a travel-limiting structure mounted between the structural members and that defines and imposes upon the stabilization member a maximum distance by which the first and second structural members may be separated. The travel-limiting structure can include an axially inextensible, laterally flexible elongate element, e.g., wire-rope cable, disposed between the structural members. The resilient element extends between respective first ends of the structural members, while the travel-limiting structure can include terminations at opposite ends of the elongate element and mounted to respective second ends of the structural members opposite the first ends thereof.

A folding chair may include an upper frame, two armrests, two side frames, a front linking unit and a rear linking unit. When the user moves the armrests down to start chair folding process, the front linking unit and rear linking unit start to shrink and bring the side frames closer to each other. In the mean time, two side connecting rods are driven to bring the upper frame to moves down and further squeeze a seat fabric into a space between two side frames to form a compact structure of the folding chair. The size of the folding chair can be determined by extended length of the front linking unit and a rear linking unit. The folding chair proposed in the present invention is comfortable and stable for the user to sit, and all elements of the folding chair can be easily and closely folded into a compact size.