US2941417A - Movement regulating arrangement - Google Patents

Description

June 21, 1960 H. JUNGHANS ETAL 2,941,417

MOVEMENT REGULATING ARRANGEMENT Filed Jan. 23, 1957 2,941,417 MOVEMENT REGULATING ARRANGEMENT Helmut Junghans and Kurt Biiu'erle, Schra'mberg-Sulgen, Germany, assignors to Gebruder Junglrans A.G., Schram'berg KreiS Rottweil, Germany Filed Jan. 23, 1957, Ser. No. 635,662

Claims priority, application Germany Jan. 24, '1956 6 Claims. (Cl. 74- 527) The invention relates 'to a movement regulating arrangement with an oscillating system comprising a permanent magnet and a spring and controlling a magnetic escapement wheel. Such movement regulating arrangements are described, for example, in the Clilford German patent specifications Nos. 809,420; 812,615; 914.837-and United States Patent 916,160. The present invention deals with improvements in the construction of the magnet as well as the whole arrangement of the movement regulator and the design of the adjusting and regulating means. In particular, the invention has for its object to produce a movement regulating arrangement in the form of an independent group of parts (so-called escapement). In the manufacture of permanent magnets, which are preferably of U-shape with the ends of the U-arms directed inwards in order to form facing vpole end faces, difficulties have been encountered owing to the fact that the high-alloy cobalt-magnet steel plate employed could only be stamped with an exceptional amount of wear on the tools, if at all. It has been found that this objection can be successfully overcome by building up the permanent magnet from at least two at least partly congruent laminae. When stamping the thin plates, the wear on the tools remains within economically acceptable limits.

In the case of magnetic movement regulators of the type here coming into question, it has already been proposed to fit a safety finger near the magnet poles as safety device against getting out of step in the event of jolts, overwinding of the driving spring and the like, which finger under normal running conditions, descends between the poles of the escapement wheel without touching them and has as its object to catch on the pole teeth of the escapement wheel in the event of its getting out of step. The making of the permanent magnet from thin laminae now renders it possible to stamp out the preferably dove-tailed recesses on the pole arms for receiving a non-magnetic bridge provided with suitable fixing lugs and the middle, preferably curved portion of which forms the passage safety member for the escapement wheel. In spite of the hardness of the steel plate from which the magnet is made, a convenient combination between magnet and safety member from the point of view of manufacturing technique is produced inthis manner.

The oscillating system composed of a magnet and a spring, is fixed on the frame of the movement regulator or the train of gears coordinated thereto by means of a support which, according to the teaching of the Clifford German patent specification No. 809,420 is located approximately in the centre of gravity of the oscillating system or near an axis which passes through the centre of gravity. For mass production it has been found advisable according to the invention, to fix the support on the bearing frame of the movement regulator so that it can turn about an axis extending parallel to the axis of the escapement wheel. By turning the oscillating system about its axis of support the depth to which the ice magnet .poles dip in relation to the escapement wheel can.

ing the oscillating spring. As in the case of the screw being unintentionally screwed home too far the oscillating system or the escapement wheel might become :damaged, it is proposed, according to the invention, to

mount an eccentric bolt rotatable in the frame plate, in stead of using the micrometer screw. This arrangement presents the advantage that it enables very fine regulation and moreover ensures that the bolt, when the magnetis arranged accordingly, cannot be so far advanced that it comes into contact with the magnet.

In order to facilitate both the assembly and also in particular the fitting of timepiece movements with a movement regulating arrangement according to the invention, the oscillating system can, according to a further feature of the invention, be accommodated together with the escapement wheel and also at least one gear wheel connected up in series therewith, or preferably two such wheels, in a special movement frame composed of two movement plates and spacing posts, the movement frame being provided with connecting means for mounting on a movement frame (time movement) comprising the driving spring, the remaining parts of the chain of gears controlling the movement regulator, the hand driving gear and, if necessary, other gears such as for example striking or alarm gears, in such a manner that the movement plates lie in pairs approximately in the same planes.

Magnet movement regulating arrangements of the type here coming into question are somewhat sensitive to fluctuations in power. This applies particlarly to 8- day timepieces. According to a preferred form of construction of the invention a power compensating device known per se, can be fitted in the chain of gears between the driving spring and the movement regulating arrangement; a suitable device is shown in the Clifford German patent specification No. 875,592.

Other features and advantages of the invention will become apparent from the following description of one form of construction, from the accompanying drawings and from the claims.

-In the drawings:

Fig. 1 is a perspective view of the permanent magnet;

Fig. 2 shows in a similar View to Fig. 1 the bridgeshaped passage safety member;

Fig. 3 is a side elevation of the movement regulating arrangement with the front plate of the movement removed, and

Fig. 4 is a top plan view of Fig. 3.

As can be seen from Fig. 1, the permanent magnet as a whole is designated by 10 and composed of two congruent laminae 1-1 and 12. The magnet body 10 is of substantially U-shape, the ends of the pole arms 10a and 10b being directed inwards and form opposite pole end faces 10c and 10d. To enable the magnet to be connected with the oscillating spring 13 (-Figs. 3 and 4) the magnet laminae have two punched holes 10e. Dovetailed recesses 10] and 10g are formed in the ends of the magnet arms 10a and 10b. These recesses serve for receiving rivet lugs 15a and 15b formed on a bridgeshaped non-ferrous part designated as a whole by 15, which part is riveted to the magnet lamina packet and serves to catch with its curved middle part 15c the escapement wheel 16 by its pole teeth 16a, when it is about to fall out of step with the oscillating system composed of the magnet and oscillating spring 13, for example in the event-of a jolt.

The oscillating spring 13 is provided with a tongue 13a by means of which it is fixed by a screw on the support 17, the support consists for example of section brass and has a turned pin 17a by means of which it is riveted to the movement plate 19 with an interposed friction washer 18. The support has a transverse bore 17b to enable the introduction of a long pin from the side, with the aid of which pin the support can be adjusted very accurately in relation to the escapement wheel 16 for regulating the distance of penetration of the magnet poles 10c and 10d.

For the precision adjustment of the movement an eccentric-bolt 20 made of iron is turnable about its shank 20a in the movement plate 19. On the outer end of the We claim:

1. Movement regulating device with an oscillating system comprising-apermanent magnet and a spring for '3 controlling an escapement wheel, the permanent magnet being U-shaped in plan and is composed of at least two at least partly congruent laminae constituted by a material in the form of layers, said layers having recesses within one edge thereof, and a reinforcement member fitted on the magnet and secured in the recesses and co operating with an escapement wheel, the permanent magnet having its end faces opposite each other, the reinforcement member being composed of non-magnetic bridge provided with depending lugs by means of which it is secured in the recesses.

2. Movement regulating device according to claim 1, in which the recesses each have a swallow-tail configuration.

3. A magnet for use in a magnetic escapement mechanism for an electric clock comprising a U-shaped member in plan composed of at least two at least partly congruent laminae in the form of layers, each layer having' recesses within one edgethereof, and a bridge rein forcement member secured in the recesses and composed of a non-magnetic bridge provided with depending lugs by means of which it is secured in the recesses.

4. A magnet for use in a Clifford magnetic escapement mechanism comprising'a U-shaped member in plan composed of at least two at least partly congruent laminae in the form of layers with each layer provided with at least two recesses in the outer ends of the legs of the U, and a bridge reinforcement member secured in the recesses andcomposed of a non-magnetic bridge material across the outerends of the legs, said bridge being secured in the recesses by means on the bridge.

5. Amagnet according to claim 4, in which the means on the bridge being in the form of lugs secured'in the recesses.

6. A-rmagn'et according to claim 4, in which the U- shaped congruent laminae are stamped, out from the material from which they are made.

i References Cited in the file of this patent 536,919 I Great Britain May 30,

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