Horology: time measuring systems or devices – Mechanical time base – Mainspring
Patent
1979-10-24
1982-12-14
Roskoski, Bernard
Horology: time measuring systems or devices
Mechanical time base
Mainspring
368139, 368148, 368142, G04B 110
Patent
active
043635539
ABSTRACT:
A watch mechanism incorporating two barrels each containing a spring. The springs contained in each barrel are positively connected in series to each other via a gear mechanism or a common arbor.
The considerable energy available makes it possible to maintain the movement of a high frequency spring balance oscillator. The barrel rotates rapidly to drive the first pinion of the train of gears with an angular velocity approximately double relative to the normal angular velocities; the torque is approximately half (600 gr.mm) that of conventional-sized watch mechanism of comparable performance.
The barrels may be mounted coaxially or in the same plane and the mechanism can be arranged to be wound manually or automatically.
REFERENCES:
patent: 3479813 (1969-11-01), Kocher
P. Bequin, "Higher Frequency of the Balance Means Improved Precision, How? Why? In What Areas?", pp. 324-329, Swiss Watch and Jewelry Journal, May 1972.
Defossez, Cours d'Horlogerie (4th Ed., 1950).
Drehganguhren Deutsche Uhrmacher-Zietung--1925, pp. 857-859; 901-903; 969-971.
Drehganguhren Deutsche Uhrmacher-Zeitung--1926, pp. 825-828.
Maire, "Les barillets a rotation rapide", Bulletin annuel de la Societe de Chronometrie V (1967), pp. 86-87.
Studer Raymond
Thomi Michel
Compagnie des Montres Longines Francillon S.A.
Roskoski Bernard
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