Spring-barrel supplying constant torque

Details Spring-barrel supplying constant torque Spring-barrel supplying constant torque

1994-09-29

1996-07-23

Roskoski, Bernard

Horology: time measuring systems or devices

Mechanical time base

Mainspring

185 37, G04B 110

Patent

active

055397085

ABSTRACT:
The mainspring (3) is coiled inside a barrel at an angle .alpha.=n2.pi. radians. The spring has a rectangular section of a constant width. At least one first portion of the spring extending from the wall (2) of the barrel towards the core (5) has an increasing thickness e selected so that the coiling angle .alpha. times the cubed value of the thickness e has a constant value, namely .alpha..e.sup.3 =constant. One thus obtains, at least in the effective part, namely conventionally the first twenty four hours of operation, a constant force supplied by the barrel and consequently a constant amplitude of the balance.

REFERENCES:
patent: 947147 (1910-01-01), Von Bolton
patent: 1922921 (1933-08-01), Anderson

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