DE9015372U1 - Clock - Google Patents

Description

The invention relates to a watch according to the preamble of claim 1.

Clocks are usually both a time display device and a piece of jewelry. The aesthetic effect on the observer is therefore significant. The time display system plays a large part in this effect. Two systems are mainly used today: the traditional analogue and the digital display. A display is also known (DE-OS 36 16 886) in which the hours and minutes are shown on the traditional dial by the two ends of a line instead of two conventional hands. In the above-mentioned document, three different types of design are basically specified: the line is either shown by a thread, by telescopically sliding elements or by a liquid crystal display. The end points of the line move on

Telephone: (02 21) 131041 Telex: 888 2307 dopa d Fax; (02 21)13 4297 (0221)134881 Telegram: Dompatent Köln

Accounts:

SaI. Oppenheim jr. & Cie. Cologne (bank code 37030200) Account no. 10760 Deutsche Bank AG, Cologne (bank code 370 700 60) Account no. 1165018 Postgiro Cologne (bank code 370100 50) Account no. 654-500

concentric circular paths around the center of the dial, the length of the line therefore fluctuates periodically and the designs are associated with some technical effort and design difficulties.
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The invention is based on the task of creating a watch that is interesting and inspiring to the observer and that is not technically complex.

This object is achieved according to the invention with the features specified in the characterizing part of claim 1.

In the clock according to the invention, the minute hand is coupled to the hour hand, which is guided on a circular path with a radius b> 0 around the center of the dial, via a rigid link. The rigid link moves with a periodically fluctuating angular velocity of
_{33QO/h(lt cos} (330/h · t)

- siif (330°/h · t)

around the hour hand, where t is the time in hours. The minute hand is attached to the rigid handlebar at a distance a> b, so that the minute hand is guided on a concentric circular path around the hour hand, which moves at a uniform speed on a concentric circular path around the center of the dial once every twelve hours. Hours and minutes are indicated by the positions of the hands in relation to the center of the dial. The shape of the handlebar connecting the hands is arbitrary. The handlebar can be designed, for example, as a straight or as a multiply bent connecting rod. If the rigid handlebar for the

Visible to the viewer of the watch, the moving handlebar can create a particularly aesthetic effect.

The periodically fluctuating angular velocity of the rigid link can be generated from a uniform rotary motion by an irregularly shaped gear pair, gears 5 and 6. The gears 5 and 6 have the same circumference and the same number of teeth, but are shaped differently. The first gear 5 has an "effective radius" of

/α - sin ² a + cos α

2 · I/π* - sin-* α + cos α

with α = 0° ... 360° and C = center distance of gears 5 and 6, and is driven at a constant angular speed of 330°/h. The second gear 6 has an "effective radius" of

r· + cos(ß)
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2 · § + 3 · cos(ß) + §

with 3=0° ... 360°.

The axis of gear 6 then rotates with the required periodically varying angular velocity.

Fig. 1 shows an embodiment of the invention in the 10.45 o'clock position. The hour hand 2 and the minute hand 3 are designed as point-shaped display elements, the positions of which in relation to the center of the dial indicate the hours and minutes. They are coupled via a rigid link 1, which is designed as a multiply bent connecting rod and moves around the hour hand. The hour hand

hand is arranged on the rotation axis of the handlebar 1 and the minute hand 3 is arranged on the free end of the handlebar. The rotation axis for driving the handlebar 1 is guided in a rotating circular disk 8 in the middle of the dial 7. The diameter of the disk 8 is chosen in this example so that the minute hand 3 is always outside the disk.

Fig. 2 shows another embodiment of the invention in the 4.30 o'clock position. Here, the axis of rotation of the handlebar 1 is guided in a rotating ring 9 around the center of the dial 7. The circular disk 12 inside the ring 9 can either remain stationary or perform a rotating movement every second.
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Fig. 3 shows a third version in the 4 o'clock position. In this case, the dial markings 10 are mounted on a transparent cover 11 above the rigid link 1 connecting the hands 3, 4. The disk 8, in which the pointer axis located under the point-shaped hour hand 2 is guided, is chosen to be so large in this version with a diameter of d> 2 · (a+b) that the rigid link 1 together with the hands 2, 3 is never moved beyond its edge, and thus grooves or rings in the display field of view can be avoided.

Fig. 4 shows an embodiment of the invention in the 11.30 o'clock position. In contrast to the version shown in Fig. 3, here an additional decoration 13 is attached or painted on the rotating disk 8. The dial markings 10 are in turn attached to the cover 11.

Fig. 5 shows the embodiment presented in Fig. 4 in

12 o'clock position. Handlebar 1 and decoration 13 now act as a closed form. This constellation of hands and decoration occurs periodically every 65.4545 minutes. It is clear here that the clock according to the invention has a wide range of design options thanks to the rotating disc 8 in combination with a visibly attached handlebar 1 of any shape.

Fig. 6 shows a possible arrangement of the parts responsible for the pointer movement. The first non-circular gear 5 sits with its drive 14 freely rotatable on a central axis 15, which is firmly connected to the disk 8. The rigid link 1 connecting the pointers 2, 3 is firmly connected via the axis of rotation 4 to the second non-circular gear 6, which meshes with the first gear 5. The central axis 15 is driven clockwise at an angular speed of 30°/h. Taking into account the rotation of the disk 8 caused by this, the drive 14 is driven counterclockwise at a speed of 300°/h.

Fig. 7 shows the same arrangement seen from the clockwork side. The gears are shown in the form of the "effective radii". The first gear 5 has an "effective radius" of

ω - sin* u + cos a

r,(«) =
2 · ]/p - sin-* α + cos α

(α= 0° ... 360° and C = distance between the gears),
while the second gear 6 has an "effective radius"

from

£ ⁺ cos β

" 2 · I ♦ 3 · cos &bgr; * £ "
( B = 0° . . . 360°).

The distance of the hour hand 2 from the center of the dial is indicated by b and the distance between the hour hand 2 and the minute hand 3 attached to the rigid handlebar 1 is indicated by a. The ratio a/b is 2.5.

Fig. 8 and Fig. 9 show another version of the pointer drive. In contrast to the arrangement shown in Fig. 6 and Fig. 7, the rotary motion of gear 6 is transmitted here via two additional circular gears with the same number of teeth, 16 and 17, to the rotary axis 4 of the rigid handlebar. The angular speed of the drive 14 in this case must be 360°/h clockwise, and that of the central axis 15 must be 30°/h clockwise.

Fig. 10 shows an embodiment in which the link 1 connecting the hands 2 and 3 is designed as a circular disk. The hour hand 2 and the minute hand 3 are in the 3:30 o'clock position. The rigid link can in principle have any shape.

Claims (4)

EXPECTATIONS Clock with a dial (7), an hour hand (2) and a minute hand (3), the hour hand (2) being guided at an angular speed of 30°/h on a circular path with the radius b> 0 around the dial center, the hands (2,3) being display elements moved on closed orbits, the positions of which in relation to the dial center indicate the hours or minutes, characterized in that the minute hand (3) is coupled to the hour hand (2) via a rigid link (1), that the minute hand (3) is attached to the link (1) at a distance a> b from the hour hand (2) and that the link (1) rotates around the hour hand at an angular velocity of g-sirf (330/h · t) rotates, where t is the time in hours. 2. Clock according to claim 1, characterized in that a first non-circular gear (5) with an effective radius of ^cos 2 ■ l/S - sin ² α + cos α is provided, which has a second non-circular gear (6) with an effective radius of r ⁺ cos 5
2 2 · £ * 3 · cos 3 * J where ^α and 3 is an angle between 0 and 360° and C is the distance between the gears (5) and (6), and that the rotary movement of the second gear (6) is transmitted to the rigid link (1). 3. Clock according to claim 1 or 2, characterized in that the hour hand (2) is attached to a circular disk (8) which is rotated at an angular speed of 30°/h. 4. Clock according to one of claims 1-3, characterized in that the dial (7) consists of a transparent cover (11) with markings (10) for the hours and minutes, and that the handlebar (1) is arranged behind the dial (7).