DRUM SHAFT AND MAINSPRING Russian patent published in 2017 - IPC G04B1/18 

FIELD: physics, clocks.

SUBSTANCE: method (21) of manufacturing the drum shaft (10) for clocks, comprising: - drawing the blank to form a continuous profile (30), projecting or deepened relative to the bearing sector (2) having an axis (DC) of additional treatment, parallel to the blank axis, and the section of which mates with the section of the response engaging means (3) to be performed on said shaft (1); - machining the entire outer contour of the shaft (1) during the further processing operation. The drive member (100) comprising: - the predetermined helical mainspring (10) comprising the engaging means (13) at the inner end (12), having a predetermined profile (14); - the shaft (1) manufactured in this manner and containing the bearing sector (2) for supporting said first wrap (11) and the receiving engaging means (3) having a response profile(314) with respect to said profile (14) for joint turning with the said mainspring (10).

EFFECT: invention contributes to the strength of the clock running gear.

15 cl, 50 dwg