DE8421123U1 - Fastening device for a clockwork - Google Patents

Description

Fastening device for a clockwork

The innovation relates to a fastening device for • Attaching the housing of a clockwork to a clock shield, in which the housing to rest on the back of the Clock shield comes and here the pointer shafts protrude through a hole in the clock shield.

For fastening a clockwork to a clock plate, it is known to use the front of the housing for the clockwork to be provided with threaded holes, into which screws via holes from the front of the watch plate be screwed in. Here are usually at least three screw connections are provided, whereby three screwing operations are required.

Furthermore, so-called central fastenings are known, in which the housing bore for the pointer shafts has a threaded attachment with which a threaded bushing can be screwed, which is inserted from the front of the watch plate through the hole there. There is also a screwing process for assembly

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8835/229 ch-ha

13 *. July 1984

necessary. Also, depending on the thickness of the watch shield different lengths of threaded bushes in stock will.

There is the task of the fastening device so to train that screw connections are not required during assembly. This task is solved with the Features of claim 1, advantageous configurations can be found in the subclaims.

Exemplary embodiments are explained in more detail with reference to the drawing explains, which shows the back of the watch plate and the clockwork case in a perspective view.

The watch plate 1 has a bore 2. If the clockwork housing 3 is connected to the clock shield 1, then protrude through this bore 2 the pointer shafts 4. In the embodiment shown, the clockwork case has a rectangular one Cross-section on.

On the back of the plastic clock shield 1, two tongues 5, 5 'are formed on both sides of the bore 2 and run at right angles to the plane of the clock shield 1. These tongues 5 »5 'are essentially T-shaped. Their mutual distance corresponds to the distance between the side walls 6, 6 'of the housing 3. On these side walls 6, 6 ¹ are two protruding latches? ribs 7, 7 ¹ formed. The mutual spacing of the locking ribs 7, 7 'corresponds to the width of the central leg 8, 8 ^{1 of} the T-shaped tongues 5, 5 ¹ . The length of these locking ribs 7, 7 'corresponds to the length of these central legs 8, 8'. The locking ribs 7, 7 ″ are each provided with a bevel 9, 9 ′ on the front of the housing.

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8835/229 '_ ₅ - I ₃ . j _u1i 1934

For * assembly, the watch case 3 is pressed on the back of the watch plate 1, whereby the tongues 5, 5 'are bent ^{by the locking ribs 7, 7 1} Ends of the locking ribs 7 _t 7 '.

To dismantle the housing 3 from the watch plate 1, the tongues 5, 5 ¹ are bent outwards and the housing 3 is pulled off to the rear.

So here the tongues 5, S 'can not be bent too much to the outside · can in each tongue 5, 5 ¹ a bend limiting stop 11 be formed on the Uhrschi! Drück- $ eite. In the exemplary embodiment shown, this stop 11 is designed in the shape of a triangle and runs at right angles and at a slight distance from the tongue 5

On the side facing away from the housing 3, an opening 12, 12 ' ^{can be connected to each tongue 5, 5 1.} The opening is preferably designed like the opening 12, which is U-shaped and engages around the tongue 5 in a U-shape. This increases the elasticity of the tongue 5.

In order to obtain proper guidance relative to the watch plate 1 when inserting the housing 3, there are also the back of the clock shield 1 fixation webs 13 formed, which are also at right angles to the plane of the clock shield and the inner contour of which corresponds to the outer contour of the housing 3. In the illustrated exemplary embodiment 4 fixing webs 13 are provided which encompass the four corners of the housing 3.

Claims (1)

Expectations Fastening device for attaching the housing of a clockwork to a clock shield, in which the housing comes to rest on the back of the clock shield and here the pointer shafts protrude through a hole in the clock shield, thereby gekennzei ch net that on the back of the clock shield (1) at least two Tongues (5, 5 ¹ ) are integrally formed, of which at least one is elastic, which are arranged at one.der opposite points of the bore (2) and which mutually engage opposite side walls (6, 6 ') of the housing (3). Fastening device according to claim 1, characterized in that the tongues (5, 5 ¹ ) are T-shaped and the side walls (6, 6 ¹ ) each have two locking ribs (7, 7 ') whose mutual spacing is equal to the width of the central leg ( 8, 8 ') of the T-shaped tongues (5, 5 ⁽ ) and which end at a distance from the front of the housing that is the distance from the transverse leg (10, 10') of the T-shaped tongues (5, 5 ') to the rear of the clock plate (1) corresponds. -2- 8835/229.:. ! '* € -'> •• «. '• July 1984 CH Ha ί 3. Fastening device according to claim 2, characterized f characterized in that the locking ribs ! „· (7, 7 ') are bevelled on the front of the housing. ^ 4. Fastening device according to one of claims m 1 to 3, characterized in that 'r at a distance from the side facing away from the housing (3) ·· of the tongues (5, 5 ¹ ) each one the bend of the tongues (5, 5 ¹ ) limiting stop (11) is formed on the back of the watch plate (1). 5. Fastening device according to one of the claims 1 to 3, characterized in that the clock plate (1) on the housing (3) facing away Side of the tongues (5, 5 ') each have an opening (12, 12'), the width of which is at least equal to the width of the central leg (8, 8 ¹ ) of the tongues (5, 5 ¹ ) « 6. Fastening device according to claim 5, characterized in that the openings (12) are each U-shaped and encompass the respective tongue (5). 7. Fastening device according to one of the claims 1 to 6, characterized in that on the back of the watch plate (1) fixing bars (13) are formed, which correspond to the contour of the housing (3). 8. Fastening device according to claim 7, characterized in that the fixing webs (13) comprise the four corners of the housing (3) . -3-