Patent ID: 9562560
Date: 2017-02-07
CPC Classifications: A63H,B62D,F16C

Claim:
1. A tilt and lock apparatus, comprising: a tilt servomechanism; a spiral torsion spring, comprising: a lock wheel mechanically coupled to the outer end of the spiral torsion spring, the lock wheel comprising: a lock hook comprising a head, the head engages and disengages the one or more grooves of the lock wheel, wherein the lock wheel is stationary when the head engages one of the one or more grooves of the lock wheel, and wherein the lock wheel is rotatable when the head disengages the one or more grooves of the lock wheel; wherein the external surface of the lock wheel comprising at least a first groove and a second groove from the one or more grooves of the lock wheel, wherein a first amount of backlash between the head and the first groove when engaged differs from a second amount of backlash between the head and the second groove when engaged.