DE1964685U - WRISTWATCH SCALE RING. - Google Patents

Description

DIPL.-ING. H.SCHIFFER

Patent attorney. ■ I3; April 1967 HOl / hf

Karlsruhe / Baden (9919)

ffcompany Karl Hexer » Uhrgehäusef abrik,
753 Pforzheim, -Salierstrasse- 29

Arm and.uh.r- Skal enr ing

Düe Meuerujag refers to a rotatable one
the top of the watch case of a wristwatch attached scale ring, which rests on a rotating surface of the watch case and is held by means of an annular spring inserted into an inner groove of the scale ring.

Such scale rings are generally made of metal, usually made of surface-finished aluminum. Even with relatively small cross-sections, metal rings still have sufficient strength to support the Requirements placed on such a scale ring will be enough. In particular, the pressure of the ring spring must not expand the scale ring so far that it slide out of its attachment and not be affected by "bending" in its movement can be. In addition, since the scale on the upper ~

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side of the scale ring engraved or otherwise attached must be, the production * together with the relatively difficult turning of the scale ring outwardly expensive. ".

Attempts have also been made to create such scale rings to be injected from plastic, which would make production much easier and cheaper. The plastics However, compared to metals, they have a significantly lower strength, so that they are considerably need to be trained more. If this already limits their use, it becomes even more so narrowed that plastics, the appearance of which are suitable for the intended use, through Water absorption swell, making it difficult or it is even impossible to achieve the required tight tolerances to be observed. In addition, the required internal groove a relatively expensive tool is required that has the advantage of simple manufacture in part again picks up.

The task of the innovation therefore had to be a graduated ring indicate which has the gate parts of the metal graduated ring in the case of a cheap plastic version.

After the furnace, this is achieved by the fact that the graduated ring is made of an inner ring that accommodates the ring spring.

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the metal guide ring and one around the guide ring molded around the outer plastic ring is. :

Such a design of the scale ring are the advantages ... of the metal ring with united with those of the plastic ring. The forces for absorbing the annular spring or those for absorbing deformation The necessary stability is provided by the Metal guide ring ensures good malleability the plastic ring in the injection molding process is used to to give the scale ring its outer, pleasing shape with the embossed characters. All in all the scale ring fulfills all of it. made demands and is also cheap and simple can be produced because the metal guide ring is a part of the machine produced without difficulty - and then in the simplest way Way with. any plastic compound, to which no fit requirements are made, can be overmolded. .-. - -

Expediently, the plastic ring will be designed in such a way that that it protrudes over the metal guide ring and thus the gap between the watch case and the guide ring Covered. This not only prevents the gap from being soiled and thus the scale ring is sohwerooth, but it is also achieved that the top of the watch case has a pleasing appearance

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view offers. VV ■: .V -: "- -. ■

Pührungsringes and bottom of the plastic _ring. Vorieilhafterweise of maa is the bottom!

Lay £ on one level so that bexde! Ropes on the rotating

slide flat of the watch case. In general, the smaller Eeib coefficient for the .gu, eiten. of metal lying on metal, it can then even be expedient the underside of the plastic ring. easy to cut out, so that only metal "slides on metal" with certainty. On the other hand, it is the Eeib coefficient of the used Plastic on the rotating surface of the watch case

ι than that of the metal guide ring on the rotating surface , _

so you will advantageously hold the guide ring up encapsulate the inner groove of the plastic ring and thus achieve friction between plastic and metal.

The iFire object is on the drawing. schema-. table shown. In a watch case 1, a watch glass 3j is snapped into place against a shoulder of the watch case 1. The shoulder 2 has a milled recess 4 at the far end, into which a hanging spring 5, which in the drawing is located in an inner groove β of a metal guide ring 7, can escape. Injection-molded onto the metal guide ring 7 is: a plastic king 8 which, with a part 9 carrying the scale, protrudes far beyond the metal guide ring 7. The metal miter ring 7 and the plastic ring 8 are located

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with their underside on a rotating surface 10 of the Watch case 1.

The outwardly acting forces of the ring spring 5 Γ are absorbed by the metal IHihrungsring 7,

the external forces that could deform the scale ring, resists. To this metal guide ring 7 is the Plastic ring 8 injected around, which, by simply changing the tool, can take on any form and in particular can also have embossed digits. The production of this scale ring is extremely easy, because the metal guide ring 7 on the machine can be processed very quickly and with sufficient accuracy and the encapsulation of this metal guide ring is just as easy to carry out in suitable tools by unskilled workers.

Claims (4)

(9919) ■ "■ -: .. '" ■; ■■: .. - ■ - δ Protection claims * -_ ": r': ■: \ ■■." ". 1. Rotatable, on the top of the. ". Watch case one Wrist watch attached scale ring, which rests on a rotating surface of the watch case and - by means of - a an inner groove of the scale ring- inserted ring spring is held, - "" '- ". ■ - ■" - ;. characterized, . - _: that the scale ring is formed from an inner, ... the ring spring (5) receiving metal guide ring (7) and an outer plastic ring (8) molded around the guide ring (7). -. ■ -_: .- ^; ":""■" 2. scale ring according to claim 1, characterized in that the plastic input. (S). over the top of the I ¹ Uh-. ring ring (7.) protrudes (9) .- - - - - -. . ■ 5 «scale ring according to claim 1 or 2, characterized in that that the underside of the guide ring (7) and the underside of the plastic ring. (8) "in one plane lie" . . . -; : 4. scale ring according to claim 1 or 2, .. characterized in that the "guide ring (7) except for the inner groove (6) of the plastic ring, (d) " umspritzt.ist.