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Manual control device for a watch movement
| Details |
Inventors: Strasser, Joseph;
Assignee: Montres Longines Francillon S.A. (CH)
Primary Examiner: Miska; Vit W.
Assistant Examiner:
Attorney, Agent or Firm: Pollock, Vande Sande & Priddy
In order to enable a watch movement to be mounted in a case having a back cover integral with its case band, the manual control device of this movement comprises a shaft having a terminal pair of resilient claws. Notches are disposed in the claws and grip a pin disposed diametrically in the central housing of the crown. The body of the crown is manufactured in one piece with a sleeve engaging in a bore of the case band. The movement is inserted with the shaft by presenting in slantwise, then the crown is put into place by forcing the pin between the claws to introduce it into the notches. |
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DETAILED DESCRIPTION It is an object of the invention to provide an analagous device, but of considerably simpler construction.
It results from the distinguishing features of the manual control device which are defined in claim 1 that the crown is extremely simple since it only presents a central cylindrical housing and a pin disposed diametrically in said housing.
The part of the shaft that is fixed to the crown in the known devices and its fixing device to said crown are therefore no longer necessary.
A special embodiment has the defined in claim 2 have the additional advantage of substituting the sleeve of the crown for the tube generally fixed to the case in water-resistant watches.
The space around the shaft in the bore of the case, which is free in the absence of the crown, makes it possible to case up and uncase the movement from the glass side of a case having a back cover integral with its case band.
The movement can, indeed, be placed in an oblique position to the entrance of this case.
The part of the device which is solid with the shaft and has notched claws, can consist of an independent piece, screwed to the extremity of the shaft or driven onto and bonded to this extremity of the shaft.
It can also be manufactured in one piece with the shaft.
The passage of this shaft through the wall of the case band can be made waterproof by a waterproof joint mounted in a housing in the case band in such a way as to surround the sleeve of the crown.
The pin gripped by the notches of the claws solid with the shaft can be arranged across the sleeve of the crown, beyond the waterproof joint, towards the interior of the case, if a leak is to be feared between this pin and the wall of the crown.
Finally, depending on the position of the pin within the crown or if the movement provided with the control device has to be capable of being mounted in cases of different dimensions, various notches can be provided in sufficiently long claws.
If necessary, the extremities of these claws can be removed
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