wristwatch

Abstract

The invention relates to a mechanical wristwatch with a stop function. At the free end of a zero-setting lever 2, at the contact point thereof with a switching cam of a control lever 1, a micro ball bearing 4 is arranged such that the inner ring thereof is fastened to the zero-setting lever 2 and the outer ring thereof contacts the switching cam of the control lever 1 when a zero-setting lever pushbutton 3 is actuated. The advantage of this is that the stop mechanism of such a wristwatch is more precise in its function and smoother in its operation and actuation thanks to the inventive design.

Description

[0001] The invention relates to a mechanical wristwatch with a stop function.

[0002] A wristwatch with a stop function and a zero-setting device by means of a control lever and switching cam is known, wherein the control lever and switching cam are mounted so as to be rotatable relative to one another or rigidly on a common bushing and the switching cam has a limiting pin against which the zero-setting lever is held at a fixed angle to the switching cam by means of a spring when the zero-setting lever pusher is not actuated.

[0003] The disadvantage is that the zero setting lever causes a certain sliding friction when it comes into contact with the cam of the control lever and when the zero setting lever pusher is actuated, which in turn has a detrimental effect on the precision and ease of use of the stop function (DE 197 05 121 C2).

[0004] A wristwatch with a stopwatch function and a zero-resetting device using a complex mechanism is also known. Another disadvantage is that its precision and ease of use are in need of improvement (US 2023 / 0 350 348 A1).

[0005] The object of the invention is to further improve the precision and ease of use of such a wristwatch by minimizing the mechanical friction between the cam of the control lever and the zero-setting lever.

[0006] According to the invention, the problem is solved as stated in the patent claim. For this purpose, a micro ball bearing 4 is arranged at the free end of a zero-setting lever 2, at the contact point thereof with a switching cam of a control lever 1, such that its inner ring is attached to the zero-setting lever 2, and its outer ring contacts the switching cam of the control lever 1 upon actuation of a zero-setting lever pushbutton 3.

[0007] The advantage of this is that the stop mechanism of such a wristwatch is more precise in its function and smoother in its operation and actuation thanks to the inventive design.

[0008] The invention is explained below using an embodiment.

[0009] The accompanying drawing shows a schematic view of the design and arrangement of the control lever with switching cam, the zero-setting lever with ball bearing, and the zero-setting lever pusher in a top view of the movement. Located outside the watch case is the zero-setting lever pusher 3, whose inner pin extends through the watch case to the zero-setting lever 2. The zero-setting lever 2 is designed as a one-sided lever and its short end is rotatably mounted on the plate of the movement. At the other, longer, free end of the zero-setting lever 2, the micro ball bearing 4 is arranged at the point of contact between the lever and the cam of the control lever 1, such that its inner ring is attached to the zero-setting lever 2, and its outer ring contacts the switching cam of the control lever 1 when the zero-setting lever pusher 3 is actuated.

[0010] In function of the lever mechanism when the ball bearing outer ring comes into contact with the switching cam of the control lever 1, the outer ring of the ball bearing 4 now rolls smoothly and comfortably without having to overcome a certain static friction.

Claims

[1] Wristwatch with stop function and a zero-setting device by means of a zero-setting lever (2) and control lever (1) with switching cam, wherein at the free end of the zero-setting lever (2), at the contact point thereof with the switching cam of the control lever (1), a micro ball bearing (4) is arranged in such a way that the inner ring thereof is fastened to the zero-setting lever (2) and the outer ring thereof contacts the switching cam of the control lever (1) when a zero-setting lever pusher (3) is actuated.

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