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N.PETENS PH9'10-IITHOGHAPHET. WASHINGTON. 0 C.
JOSEPH LAUBEREAU OF PARIS FRANCE ASSIGNOR TO JOSEPH
DE SUSINI OF SAME PLACE.
Letters Patent No. dated November 10 1868.
IMPROVEMENT IN TOY-WATCHES.
The Schedule referred to in these. Letters Patent and making part of the same.
To all whom it may concern -
Be it known that I JOSEPH LAUBEREAU civil engineer of Paris France have invented a motor obtained by the tension of an elastic string with variable self-acting brake proportionate to the work the motor is liable to yield said variable self-acting brake-motor being chiefly applicable to various purposes where little force is required and principally to regulators toys and more especially to toy-watches ; and I do heieby declare that the following is a full clear and exact description of the same reference being had to the annexed sheet of drawings making a part of the same.
My invention refers to a motor obtained by the tension of an elastic string with variable self-acting brake proportionate to the work that the motor is liable to yield.
This variable self-acting brake-motor is applicable to various uses where little force is required viz to regulators toys and more especially to toy-watches.
I have in the annexed drawing represented such a motor as applied to a toy-watch.
First of a lever a Figure 1 moving on a pin b fixed to the case which lever a has on its central part a block c fixed thereto and made of any soft substance such as fatty leather India rubber cork soft wood &c. &c.
"Secondly of a silk India-rubber or other elastic string d or even a small spiral spring &c.
Thirdly of a small shaft e having a pulley f affixed to it on which the block c exerts a friction. Both the shaft and pulley may be formed of one same piece.-
Fourthly of a grooved or guide-pulley g turning on a pin fixed in the case. The silk India-rubber &c. string d passing over the pulley g allows of the said string being sufficiently long to be rolled three or four times round the shaft e under the pulley f. One end of this string enters a hole formed li the shaft e and is fixed thereto by means of a pin.
Fifthly of a cross-piece h serving as a guide and bearing to the shaft which carries the pulley f. This guide is pierced through its centre with a hole which one end of the shaft traverses thus maintaining the shaft movable. Above this guide the shaft e terminates in a square to receive the hands. A like square forms the other end Figure 2 whereon fits the key for winding up the watch.
The two ends of the cross-piece h Figure 3 are se-cured to the case. The journals preceding and next to the squares on shaft e carry each of them a slight shoulder and to secure a smoother rotation of the shaft a small fatty kid washer is fitted thereon.
All these working parts are enclosed in a watch-case more or less elegant with a dial and the hands fitted on the projecting square thereon and a glass over the whole as usual.
When it is desired to set the watch in motion fig. 2 the key is fitted on the opposite square to the hands and turned from left to right as for an ordinary watch. As the winding up goes on the elastic string is rolled up round the small shaft e to which one of its ends is attached whilst the other end is secured to the end of the lever a which it pulls and this on-which the soft leather block is placed leans on the pulley f proportionately to the tension exerted on the elastic string. After two three or more revolutions the key is taken out. The hands proceed very slowly and regularly in consequence of the brake c bearing on the pulley f the pressure exerted by said brake being as the string is being unrolled proportionately less.
The combination of the.pulleys f g elastic string d and friction-lever a e with each other and with thewatch-case substantially as described for the purpose specified.
JH. LAUBEREAU. Witnesses :