A METHOD OF MAKING A TORSION SPRING

摘要

To allow the sign (12) to pivotally deflect (22), the stand (10) includes elastomeric torsion spring means (20) comprising an inner tubular sleeve and an outer longitudinally split tubular sleeve or casing between which is bonded an annular elastomeric member radially compressed by the split outer element contracted during mounting thereof in the stand (10).- Stop means limit the torsional deflection. The spring means (20) may include two of the above springs having a common torsion axis and being torsionally preloaded in opposite circumferential directions relative to said axis. The annular elastomeric member may consist of two concentric layers having different torsional spring rates and between which is bonded a rigid intermediate sleeve.