Clock

Abstract

A watch, in particular a wristwatch with one or more centrally arranged second hands. On the dial side of a bearing bridge (3) of a watch movement, at least one central gear (6) mounted on the hollow shaft of the hour wheel (1) and one drive gear (5) for one and / or a second central second hand (8, 13) are arranged. In one embodiment of the central second hand arrangement, the dial (4) is divided into an outer ring (10) and an inner ring (11), the annular gap (9) forming the orbit for the central second hand. The design and arrangement of the drive for one or more central second hands is advantageous according to the invention. This allows for a switchable stop function for a second second hand without or with only a minimal increase in the height of the watch case in wristwatches.The design also allows for the use of ball bearings, which in turn minimizes friction losses in the drive of the central seconds hand and optimizes the power reserve. A further advantage is the possibility of a two-part dial design with an annular gap for the central seconds hand guide and its novel decorative appearance.

Description

[0001] The invention relates to a watch, in particular a wristwatch with one or more centrally arranged second hands.

[0002] A wristwatch with two centrally arranged second hands is known, one of which has a start-stop function. For this purpose, one of the second hand drive shafts is designed as a hollow shaft in which the drive shaft of the second second hand is mounted.

[0003] Also known is the arrangement of the bearing of a second hand drive shaft on a bearing bridge located inside the plate (US 2003 / 0 169 643 A1) as well as the arrangement and bearing of the entire pinion of a mainspring barrel by means of a single ball bearing (DE 693 02 325 T2).

[0004] A disadvantage of this design is that it results in a relatively large overall height for the watch, due to the higher placement of the hands and the arrangement of the drive gears within the movement. The nested arrangement of several hollow shafts for the hour, minute, and second hands, as well as the shaft bearing for the second second hand, also contribute to increased friction and consequently a reduced power reserve.

[0005] The object of the invention is to create an arrangement of several central second hands while maintaining a low overall height of the clock and one with reduced friction losses in the bearing of the second hands.

[0006] According to the invention, the problem is solved as specified in the claims. On the dial side of a bearing bridge 3 on a plate 12 of a clockwork, at least one central gear 6, mounted on the hollow shaft of the hour wheel 1, and one drive gear 5 for one and / or a second central seconds hand 13 are arranged. The gear 6 can be mounted directly on the hollow shaft of the hour wheel 1 or mounted on it with a bearing bushing 7 and a ball bearing 2. The side of the bearing bushing 7 of the gear 6 facing away from the clockwork is dimensioned such that it forms a plane with the plane of the dial 4, projects out of this plane, or is located below it, wherein a central seconds hand 8 is arranged on the bearing bushing 7 of the central gear 6, or such an angled central seconds hand 13 is arranged directly on the gear 6.

[0007] In one embodiment of the central seconds hand arrangement, the dial 4 is divided into an outer dial ring 10 and an inner dial ring 11, with an annular gap 9 forming the orbit for the central seconds hand 13. In another embodiment of the clock, the inner ring 11 can be omitted, and only the outer ring 10 can be present, whereby the viewing surface of the gear 6 can be graphically designed.

[0008] The design and arrangement of the drive for one or more central seconds hands is advantageous according to the invention. This allows for a switchable stop function for a second seconds hand with no or only minimal increase in the height of the watch case in wristwatches. The design also permits the use of ball bearings, which in turn minimizes friction losses in the drive of the central seconds hands and optimizes the power reserve. A further positive aspect arises from the possibility of a two-part design of the dial with an annular gap for the central seconds hand guide and its novel decorative appearance.

[0009] The invention is explained below using three exemplary embodiments. The accompanying drawings illustrate this. Fig. 1. The drive of a central seconds hand of a wristwatch is ball-bearing mounted in cross-section and with Fig. 2 the drive of a central seconds hand of a wristwatch, ball-bearing mounted in cross-section and split dial and with Fig. 3 the drive of a central seconds hand of a wristwatch, bearing in cross-section and with Fig. 4 A central seconds hand guide for a split dial is shown schematically in top view. Example 1, Fig. 1

[0010] On the dial side of the plate 12 of a wristwatch, the bearing bridge 3 is arranged, and on it the central gear 6, mounted on the hollow shaft of the hour wheel 1, and a drive gear 5 for the central seconds hand 8. The gear 6 is mounted directly on the hollow shaft of the hour wheel 1 as a plain bearing 16 or with a bearing bushing 7 and a ball bearing 2 on it. The side of the bearing bushing 7 of the gear 6 facing away from the movement is dimensioned such that it forms a plane with the plane of the dial 4 and / or projects out of this plane. The central seconds hand 8 is located on the bearing bushing sleeve 14 of the central gear 6. In addition to this central seconds hand arrangement, a second central seconds hand 15, driven in the usual way via the hollow shaft of the hour wheel, may also be arranged, e.g., with a start-stop function. Example 2, Fig. 2 and Fig. 4

[0011] In the movement of a wristwatch according to Example 1, the bearing bushing 7 has no bearing sleeve, so that the inner dial ring 11, divided by the annular gap 9, rests on the bearing bushing 7. The outer dial ring 10 rests on the edge of the watch case. Both dial rings 10 and 11 have an annular gap 9 at the periphery of the inner dial ring 11, within which the central seconds hand 13 can rotate. Below the annular gap 9 thus formed, the angled central seconds hand 13 is arranged on the gear 6. As in Example 1, a second central seconds hand 15 can also be arranged here. Example 3, Fig. 3

[0012] Instead of a ball bearing for the gear 6 on the bearing bridge 3, the gear 6 is supported here by means of the sliding bearing 16.

Claims

[1] Clock with one or more centrally arranged second hands, characterized by , that a bearing bridge (3) is arranged on the dial side of a plate (12) of a clockwork and on it a central gear (6) mounted on a hollow shaft of an hour wheel (1) and a drive gear (5) for a central seconds hand (8, 13) are arranged, wherein the gear (6) is mounted directly on the hollow shaft of the hour wheel (1) by means of a sliding bearing (16) or is mounted on it with a bearing bushing (7) and a ball bearing (2) and the side of the bearing bushing (7) of the gear (6) facing away from the clockwork is dimensioned such that it forms a plane with the plane of the dial (4) or projects out of this plane or is located below it and wherein a central seconds hand (8) is arranged on an hour wheel bushing sleeve (14) of the bearing bushing (7) of the central gear (6) or such an angled central seconds hand (13) is arranged directly on the gear (6) and is guided through an annular gap (9) between split dial ring discs (10, 11). [2] Clock with one or more centrally arranged second hands according to claim 1, characterized by , that the dial (4) is divided into an outer dial ring disk (10) and an inner dial ring disk (11) and wherein the annular gap (9) forms the orbit for the central seconds hand (13) and the annular gap (9) is dimensioned such that the angled central seconds hand (13) is movable therein. [3] watch according to the preceding claims 1 and 2, characterized by , that only the outer dial ring disc (10) is arranged with a graphic design of a viewing surface of the gear (6).

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