| 摘要 |
632,351. Spring motors. HOBBS, E. W., and OXENFORD, G. S. March 19, 1948, No. 8194. [Class 10] A spring motor comprises a helical torsion spring 17 anchored at one end to a member 9, 10, which is rotatable for winding purposes, and at the other end to a member 6, 7 formed with a driving gear 5, the parts 7, 9 being in screw-threaded engagement so that relative axial movement of the members is produced during winding and unwinding to compensate for changes in the diameter and length of the spring. The assembly is mounted on an arbor journalled in the motor frame 1 and having a cylindrical portion 16<1>, on which the member 6, 7 is rotatable, and a non-circular portion 16a on which the member 9, 10 is slidable, winding being effected by a key engaging a projecting portion 18 of the arbor. The part 10 is formed with ratchet teeth 11 engaged by an elongated spring-loaded pawl 12. The part 6 is formed with a skirt 7<1> which embraces the part 9 and serves to support the spring when the latter is fully wound. Unwinding is limited by engagement of the end 9<1> of the part 9 with the part 6, and over-winding by engagement of a stop 19 on the part 10 with a stop 20 on the motor frame. The spring may be preloaded when assembling the motor. |
