wrong size spring by adjusting the number of winding turns. If you do not know a proper spring size, then you or your spring supplier must calculate a proper size (see below) based on an accurate weight (within 5 pounds) of the door. So you must then in turn have an accurate weight...
The most common driving mechanism is a spring hinge because it is self-deployable, lightweight and simple, as shown in Fig. 2. Nevertheless, attention should be paid to parameter optimization design for the driving spring and to the dynamic responses of the deployment process of the solar ...
(wrap up) of torsion bar48. Thus, by the time header18reaches the position illustrated in FIG. 8b(corresponding to point B on the chart of FIG. 9), torsion bar48will have wrapped up an additional 9° while the header18is, for example, approximately seven inches above the ground line24...