Chronographic fly-back timepiece having a stop-start control for the fly-back hand
First Claim
1. A timepiece of the type having a fly-back hand, provided with a control device for stopping and starting a fly-back hand, the timepiece comprising a fly-back wheel integral with the said fly-back hand, a fly-back pincer substantially in the form of a U with two branches connected by a connecting member, the fly-back wheel being disposed between the free extremities of the two branches and means adapted to deform said pincer in a manner such that they can assume two configurations, namely a first configuration called the closed, in which each branch of the pincer is in contact with the circumference of the fly-back wheel so as to block the latter and thereby to stop the fly-back hand, and a second configuration, called the open, in which the two branches of the pincer are not in contact with the fly-back wheel, so as to release the latter and to permit movement of the said fly-back hand, whereby the said timepiece also comprises two fixed reaction members which support the said connecting member and whereby said deformation means comprise means for generating a force acting against the said reaction members on the said connecting portion in a zone situated between the said reaction members, said connecting member being formed in a manner so as greater than the resilient deformability of the said branches in this same plane.
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Accused Products
Abstract
A fly-back chronograph provided with a stop-start control for the fly-back hand is provided. The control does not require careful and frequent adjustment and avoids premature wear of the fly-back wheel parts. The control device has fly-back pincer, a fly-back wheel disposed between the free extremities of the two branches of the said pincer, two fixed reaction members against which a connecting member between the two branches of the pincer bear and deformation means creating a force acting against the said reaction members on the said portion of the connecting member in order to deform it.
15 Citations
7 Claims
- 1. A timepiece of the type having a fly-back hand, provided with a control device for stopping and starting a fly-back hand, the timepiece comprising a fly-back wheel integral with the said fly-back hand, a fly-back pincer substantially in the form of a U with two branches connected by a connecting member, the fly-back wheel being disposed between the free extremities of the two branches and means adapted to deform said pincer in a manner such that they can assume two configurations, namely a first configuration called the closed, in which each branch of the pincer is in contact with the circumference of the fly-back wheel so as to block the latter and thereby to stop the fly-back hand, and a second configuration, called the open, in which the two branches of the pincer are not in contact with the fly-back wheel, so as to release the latter and to permit movement of the said fly-back hand, whereby the said timepiece also comprises two fixed reaction members which support the said connecting member and whereby said deformation means comprise means for generating a force acting against the said reaction members on the said connecting portion in a zone situated between the said reaction members, said connecting member being formed in a manner so as greater than the resilient deformability of the said branches in this same plane.
Specification