US2512087A

US2512087A - Watch

Info

Publication number: US2512087A
Application number: US655909A
Authority: US
Inventors: Willi A Buchler
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-03-19
Filing date: 1946-03-21
Publication date: 1950-06-20
Anticipated expiration: 1967-06-20

Description

June 20, .1950 w. A. BUCHLER 2,512,087

WATCH Filed March 21, 1946 N11213:? chZp Patented June 20, 1950 UNITED sures PATENT OFFICE Application March 21, 1946, Serial No. 655,909 In Switzerland March 19, 1945 Section 1, Public Law 690, A g st's, 1946 Patent expires Mai-eh 1-9, 1965 I 4 Claims.

This invention relates to watches with a twopart winding stem.

An object of the invention is to provide a watch of this kind which is characterized in that the winding stem is axially displaced for executing three operations, on displacement for two of these op'erations'the mutual tpo siti'on of'the two parts of the winding stem remaining unchanged, while for the third operation the relative axial position of these parts is changed.

My invention may for instance be used in watches with centre seconds hand, the first two operations being then used for winding and hour setting and the third operation, for bringing back the seconds hand t'o-its zero position or in chronographs for setting in motion and stopping the seconds hand. or course any operation quite apart from the above mentioned one can be done in this third operating position.

Other objects and features will be apparent as the following description proceeds, illustrating two embodiments of the invention, reference beingha'd to the accompanying drawings, wherein;

Fig. -1 represents an embodiment in which the third operating position serves to act upon the resetting or fiyback member for resetting a centre seconds hand.

Fig. 2 is a further embodiment of the winding stem.

In Fig. 1 the crown is designated by I which with the tube-shaped part 2 forms the upper cylindrical extension 3 of the winding stem. The other part 4 ends in a small piston 5 with a guideslot ii. A spring 1 is inserted between this piston 5 and the bottom of the cylinder 3. A pin 8 attached to the cylinder 3 slides axially with respect to the piston 5 and is borne in the guideslot 6, so that the two parts of the winding stem are firmly coupled together so that transmission of rotary movement from one part to the other is ensured.

A resetting member, partially shown at 9, is connected to the winding stem by non-represented elements ending at the lever II which bears a pin l8, said pin being in the operating field of the rim 12 of the extension 3. The resetting member cooperates with the heart-shaped cam Hi.

The drawing shows the winding stem in its extreme pulled out or hour adjusting position. The pin 8 lies at the upper end of the guide-slot 6 which limits the relative movement of the two

parts

3 and 4. The winding stem can be brought into a second operating position by pressing the assembly constituted of the crown l and its cylindrical extension 3 partly downwards. On this movement, the elastic force of the spring 1 is greater than the resistance which is opposed by the mechanism for adjusting the hour. For this reason, the mutual position of the

parts

3 and 4 remains unchanged and the Whole stem is thus pushed downwards in that the uncompressed spring'transmits the movement of part 3 and part 4. The third position is obtained by pressing the upper part of the winding stem completely inwards, so that the part 4 strikes against the part I 9 forming a stop means and the spring I will be squeezed together, whereby the upper part 3 of the stem will be displaced inwards with respect to the lower .part 4 which remains at rest. This displacement is limited by the length of the guide-slot 6 in which the pin 8 slides. The lever H to be driven during the last mentioned displacement is operated by the rim |2 of the cylindrical extension 3 which will come up against the pin I8 of the lever II and can, as already mentioned, control any operation within the watch. In the particular case considered, those components operate the resetting member 9 which reconducts theseconds hand to its zero position by the intermediary oi the heart-shaped cam is. In the case of chronographs, this third displacement or supplementary operation may be used for alternatelyreleasing and locking the seconds hand.

Fig. 2 shows a second embodiment of the winding stem, which differs from the first as to the way of conveying the displacement and the rotary movement to the lower half of the stem in the extreme pulled out position. Whereas in the first embodiment the rotary movement is transmitted by means of a device consisting of a pin 8 sliding axially within a guide-slot 6, in the second embodiment the same operation is done by means of a square shaped head piston I3 moving within a tubular extension I4. In the pulled out position of the first embodiment the lower half of the winding stem was pulled out into the position of adjusting the hour on account of the pin 8 coming up against the upper end of the slot 5 thus conveying its movement to the lower part 4. The corresponding element in the second embodiment in question is formed by the bent-in rim I5 which enters between the head piston i3 and a shoulder l6 beneath the square head piston is. During the relative displacement between the two parts of the winding stem, the bent-in rim is slides over the thinner cylindrical part 5?, and comes up against a pin like [8 fixed to a lever like H, so that said rim operates a mechanism 3 which can also, for instance, comprise a resetting member 9.

In this way, it is possible without additional operating outer components in watches in particular with the seconds hand in the middle and also in chronographsto make one more operation possible than has been obtainedwith winding stem devices up to the present day.

What I claim is:

1. In a time piece, a case portion, a stop meansfj a winding stem mounted rotatably and axiallyadjustably on said case portion, said winding stem comprising an individual outer portion and an individual inner portion movable into engagement with said stop means and coupled with said outer portion for rotary motion and for mutual axial displacement of said portions, a resilient means inserted between said portions to space them axially of each other and to maintain the mutual axial position of said portions on an axial movement of said winding stem unchanged until said inner portion is stopped by said stop means, and a controlmeans engageable with said outer portion on a relative axial movement of the latter with regard to said inner portion against the constraint of said resilient means.

2; In a time piece, a case portion, astop means, a winding stem mounted rotatably and axially adjustably on said case portion, said winding stem comprising an individual outer portion and an individual inner portion movable into engagement with said stop means and coupled with said outer portion for rotary motion and for mutual axial displacement of said portions, a spring in serted between said portions to space them axially of each other and to maintain the mutual axial position of said portions unchanged on an axial movement of said Winding stem from an hour adjusting position to a winding position until said inner portion is stopped by said stop means, and a seconds hand-control means engageable with said outer portion on a relative axial'movement of the latter with regard to said inner portion against the constraint of said spring.

3. In a time piece, a case portion, a stop means, a winding stem mounted rotatably and axially adjustably on said case portion, said winding stem comprising an individual outer portion and an individual inner portion movable into engagement with said stop means and coupled with said 4 outer portion for rotary motion and for mutual axial displacement of said portions, a spring inserted between said portions to space them axially of each other and to maintain the mutual axial position of said portions unchanged on an axial movement of said winding stem from an hour adjusting position toa winding position until said inner portion is stopped by said stop means, and

a center-seconds hand-resetting member engageable with said outer portion on a relative axial movement of the latter with regard to said inner portion against the constraint of said spring;

4. In a time piece, a case portion, a stop means, a winding stem mounted rotatably and axially adjustably on said case portion, said winding stem comprising a cylindrical hollow portion and a piston-like portion fitting slidably in said cylindrical hollow portion, a slot on one of said portions and a pin on the other portion, engaging said slot to couple said portions for rotary motion and for a limited mutual axial displacement, a springinserted in saidcylinder and supported on the latter and on said piston-like portion to space said portions axially of each other and to maintain the mutual axial position of said portions unchanged on an axial movement of said winding stem from an hour adjusting position to a winding position until said piston-like portion is stopped by saidstop means, and a control means engageable with said cylindrical hollow portion on a relative axial movement of the latter with regard to said piston-like portion against the constraint of said spring.

W. A. BUCHLER.

REFERENCES CITED The following references are of record in the file of this patent:

Great Britain Mar. 20, 1940