DE58118C - Clock with independent second hand - Google Patents

Description

IMPERIAL

PATENT OFFICE.

The present invention relates to watches that have an independent, in the Have the second hand located in the middle of the dial, which is in regular intervals rotates around a specific piece on the dial and shows the full seconds.

The clock is also still with an ordinary one , provided on a small ■ special dial rotating second hand. The innovation consists in the fact that the independent one is placed in the middle of the dial Second hand and the ordinary second hand through a single gear train be driven by the mainspring instead of the middle second hand Receives drive through a special gear train as before. The number of acting links and the connections are thereby considerably reduced, thereby reducing the size of the clock and their manufacturing costs can be reduced.

The accompanying drawing shows only the few parts of the clockwork which are used for the Understandings of Construction are required.

Figs. 1 and 2 are respectively. Front and back views of the clock.

Fig. 3 is a front view in which the dial is thought to be removed.

Fig. 4 is a rear view from which the clockwork can be seen.

Fig. 5 schematically illustrates the gear train.

FIGS. 6 and 7 are individual views of the gear train on a larger scale.

Fig. 8 is a sectional view of the independent center fourth wheel and pinion in larger scale.

α denotes the spring housing, b is the second wheel, which is rotated from α by the drive b ^l and is in engagement with the drive c ^{1 of} the small ground wheel c. The latter is in engagement with both the drive e ^{5 of} the middle second wheel e and with the drive d> of the ordinary second wheel d. / is the climbing wheel whose drive / ¹ is set in rotation by d. The wheel e is in engagement with a drive g ^l , which is seated on the same spindle with the wheel e. The latter is in engagement with a drive h whose axis carries an arm h ^l which intermittently engages in the teeth of the drive f ^{1 of} the climbing gear /. The wheel e sits firmly on the spindle e ^{4 of} the middle second hand e ⁸ , while the drive e ⁶ , which is rotated by the wheel e of the gear train, sits loosely on the said spindle e ⁱ , and the latter only by means of a spiral spring e ^s in Can set movement, the inner end of which is attached to the approach e ⁶ of e ⁵ , while the outer end of the spring with sufficiently strong friction against the inner periphery of the housing e ¹ e ^l rests against the wheel e , so that the spring in Is able to turn the latter and consequently also the spindle and the pointer.

It is thus clear that the housing a moves the ordinary second hand d ² and the climbing wheel in the usual way by means of the gear train ^{, and also sets the drive e 5 of} the central second hand e ⁸ in constant rotation. But since the movement of the wheel e is regulated by the drive g ¹ , the drive g, the drive h, the arm / z ¹ and the drive / ¹ from the climbing wheel, e will only be able to follow the rotation of the drive e ^ if the arm h ¹ emerges from the teeth of the drive f ¹ . The spring e ³ will then set the wheel e in rotation and thus also the spindle e ⁴ and the pointer e ⁸ , until the arm h ¹ and the drive h have made one complete turn, whereupon the arm h ^{1 again} for a moment engages in the small gear f ^l , whereby the movement of e and e ^s is momentarily canceled until the arm h ¹ becomes free again as a result of the rotation of f ^l.

The lowering rotation of the arm h ¹ by the climbing wheel f ¹ takes place once every second, and the size ratio of the gear train hgg ¹ e is calculated in such a way that e makes a single turn if h makes 60 turns. Thus, the pointer e ⁸ on the dial B will move through the space corresponding to one second each time it is actuated ^{by the spring e 8.}

In order to stop the central second hand at any desired moment, is a lever / arranged rotatably at p, and whose one Endej ³ of the watch case projecting (Fig. 3), so the lever with hand DAF can be moved. The other end of j ¹ is hook-shaped in such a way that, when the lever is in the position shown in FIG. 6, the arm h can freely pass the lever. If, however, the hook-shaped Endej ^'1 is moved slightly to the right, it moves into the path of the lever / 1 ¹ prior to and preventing the same to the further rotation and thus also the wheel E and the second hand e. ⁸ Under these circumstances, as a result of the further rotation of e ^5, the free end of the spring e ^{3 will} rub against the inner surface of the housing e ^l e ¹ of e , so that the small second hand of the actual clockwork is not affected at all.

Claims (2)

Patent Claims: 1. A watch with an independent second hand placed in the middle of the dial next to an ordinary second hand, designed so that both second hands are moved by one and the same drive mechanism and by one and the same helical gear, by means of a friction spring connection ee ^s between the loose, central second ^{drive wheel, continuously moved by the drive, and its spindle e 4} , the movement of which is controlled by the drive f ^{1 of} the climbing gear by an arm h ¹ and a gear train hgg ¹ and c so that that of the drive wheel e ⁵ , the spring e ³ and e Rade occasioned movement of the middle Sekandenspindel sekundlich is interrupted once and then the pointer e angiebt ^s full seconds. 2. In the clock characterized by claim 1. the arrangement of a lever j which can be engaged in the path of the arm h ¹ , whereby the movement of the latter is prevented for the purpose of being able to stop the central second hand if necessary. 1 sheet of drawings.