Eta A.g. Ebauches-fabrik

Eta Sa Fabriques D'ebauches

Ulysse Nardin S.a.

Urs Giger

Friedrich Perrot

Norberto Perucchi

Ludwig Oechslin

Edwin Jakob

Jorg Sporing

Astronomical wrist-watch

The timepiece of the invention includes at least a seconds hand arranged to respond to a chronograph mechanism. It comprises a single motor which receives at least two pulses per second so as to cause the seconds hand to advance by at least two steps per second. The system as disclosed enables an improvement in readability of the precision of time intervals on the one hand and on the other hand assures certain operation of the chronograph while using a stepping motor dimensioned to drive a simple timekeeper.

Timepiece comprising at least one chronograph function

In the quartz watch according to the invention all the time displaying hands (of the hours, the minutes and, possibly, the seconds) are kinematically permanently connected to each other, thus always displaying time in a very precise manner by their respective positions, whichever manipulations are made by the watch carrier. The addition to the conventional parts of the watch of a detector sensitive to the manually controlled displacements of the hands and of a counting device for finishing off these displacements and for memorizing the time impulses during the manual correction, ensures automatically setting the hands in the exact time indicating positions thus permitting the watch carrier who travels from one time zone into another one to make rapidly the necessary time alterations without prejudice of the previous precision of the time indication.

Quartz watch with analogical time display, comprising a manually

A stepping motor particularly intended for electronic watches comprises two poles connected to a core bearing an elongated coil. The poles are joined at nose portions thereof by interposed elements of a material having a magnetic permeability as close as possible to 1. The one-piece stator may be formed by blanking from a composite band, thus considerably simplifying the problem of positioning the poles of the stator relative to the plate of the watch movement and to the rotor. A method of fabricating the one-piece stators efficiently consists in rolling together two strips of ferromagnetic metal and an interposed fillet of non-magnetic metal, these elements being joined at their edges to form a composite band from which the stators are blanked.

Motor for electronic watch

A pallet lever which is made by first stamping regions, the surfaces of which will be working surfaces and thereafter blanking out the shape of the lever to dimensions in excess of the area of the stamped portion so that the working surfaces of the stamped portion are protected against surface damage to the blanking out operation.

Method of manufacturing a pallet lever and pallet lever made by this

A one-piece regulator key for watch movements includes two spaced apart prongs projecting from and integral with a common support, each prong has an inward plane surface facing and substantially parallel to a like inward plane surface on the other prong and is provided at its free end with an inwardly projecting protuberance for decreasing the spacing between the prongs at their free ends.

Regulator key for watch movements

A method of producing an oscillating weight for an automatic wristwatch. The oscillating weightcomprises a heavy-metal segment and a metallic center portion having a flanged rim. For attaching the center portion to the heavy-metal segment, an arcuate groove is formed in the upper surface of the segment, the flanged rim of the center portion is axially inserted in the groove which is slightly wider than the flanged rim, and at one or more locations a portion of the segment is wedged over the rim or a portion of the rim is wedged in the groove by exerting a localized pressure substantially at right angles to the plane of the center portion.

Method of producing an oscillating weight for automatic timepieces

A method of punching a small hole in a precision mechanics workpiece, in that the thickness of the workpiece is reduced by the application of pressure in the region where the small hole is to be punched and the material is thereby strengthened, steps being taken to cause the material subjected to pressure to be displaced in the direction of pressure and to yield at right angles hereto. The small hole is punched in the region subjected to pressure at a distance from the edge of that region corresponding at least to the diameter of the small hole, so that the small hole is certain to be punched at a location in that region where the material is strengthened and sound.

Method of punching a small hole in a precision mechanics workpiece

A watch movement frame comprising a plate having openings therein, a bridge, and at least one spacer member mounted edgewise between the bridge and the plate. The bridge includes separate centering structure and securing structure and the edge portion of the spacer member in contact with the bridge includes corresponding separate centering structure and securing structure. The centering structure of the bridge and of the edge portion cooperate to position the bridge relative to the plate regardless of the inclination of the spacer member and the securing structure of the bridge and of the edge portion cooperate to secure the bridge to the spacer member.

Watch movement frame

The balance cock 35, the train wheel bridge 36 and the barrel bridge 37 are positioned with great precision and univocally on the baseplate 40 by means of an arrangement comprising a pair of feet 38 on every bridge, elongated holes 39 in the baseplate being engaged by feet 38, and securing screws 42, 44, 45 driven into the baseplate 40. Each screw has a conical face on its head and it passes through an opening 41, 46 of the bridge. The conical face of each screw engages the edge of the corresponding bridge opening at one point, thus exerting a thrust on the bridge in the direction of the arrows causing each one of the two feet 38 of a bridge to bear against a plane side wall of the corresponding hole 39 and one foot of each bridge to bear against the rounded end face of its hole.

Growing community of inventors

Solothurn, Switzerland

Urs Giger