DE2223879A1 - Waterproof plunger - Google Patents

Description

C-. D! ETES IAMPIR

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ISKU-M 33 (DAHLEM)

HOITEMWEG 15 218 / 13.849 DE

Patent application

of the company
LA NATIONALE SA

Geneva (Switzerland). 2, rue des Falaises

Waterproof seat

We already know waterproof plungers, which have a sleeve attached to the socket of a watch case and a plunger head which is displaceable on this sleeve and which has a threaded bore in which is screwed in a screw that extends lengthwise in the sleeve and one on the inner end of this sleeve provided bore penetrates and which has a shoulder that extends is supported against the edge of this hole in order to limit the outward displacement of the 3-pin head,

209349/0815

PA / HW / irik ( ^l J'jJ> \) - 2 -

being a return spring which utn ^ the screw is housed in this sleeve to move the plunger head outwards.

A plunger of certain dimensions must be used for a whole range of housing sockets, which are in their Thickness differ greatly, are used. The screwed or pressed into the housing socket penetrating part of the sleeve has a standardized length. Therefore, the length of the shaft must be from Can be adjusted on a case-by-case basis. The usual solution is to use a number of slotted screws To have heads available that correspond to the graduated head lengths. Given the right one Functioning of a stopwatch required tight tolerances, these plungers are after their insertion often reworked and the length of the head slightly shortened, but with the disadvantage that it reduces the depth of the slot the screw is often shortened to such an extent that it can only be dismantled with difficulty.

Certain manufacturers have tried to eliminate these disadvantages by locking the plunger by means of a, retaining ring inserted in a groove and by lengthening the shaft by means of a partially tubular

2098Λ9 / 0815 " ^} "

shaped socket adjusted to the desired length can be. This solution makes the assembly of the unit more difficult and taxable.

The present invention relates to a ram of type mentioned above, in which reworking of the screw head length does not require subsequent work Difficulty disassembling it. This result is achieved thanks to the fact that the section of the visual hood that protrudes from the sleeve, protrudes is of a non-circular cross-section to enable it to be tightened and loosened with the aid of a tool, which acts on the outer surface of this non-circular section.

The single figure of the drawing shows schematically and by way of example an embodiment of the invention Ram.

The plunger shown comprises a sleeve I _- which is screwed into the socket 2. of a watch case. This plunger has a body which can be displaced in the sleeve 1_ , but which, in relation to this, by longitudinal grooves h_ and ^. is secured against rotation, the CJ.i ji'jrof;.; t: sj ii of the inner recess of the head j5

- k - 209849/0815

and on the other hand on the circumference of the outer end of the sleeve .1 are provided.

The tightness of the plunger is achieved by means of an O-ring 6, which is held in an annular recess J_ of the sleeve .1 by an enclosed washer 8, and which is supported on the inner bushing £ of the plunger »

The inner end of the sleeve has a bottom with a bore 1I _- for the passage of a screw 12 ,, which is tightened in a threaded bore IJi of the socket £. This screw 12 has a head 14 with a non-circular cross-section.

A spring 1 £ is _{housed in the sleeve I -} and is supported on the one hand against the base 10 and on the other hand against the socket £ ^a ° in ^{order to move} the head j £ outwards. The displacement of this head J _- outwards is limited by the head 14, which comes to a stop against the floor 10.

The head 14 has a hexagonal cross section, which enables the screw 12 to be tightened and loosened by means of a suitable open-end wrench will. It can be seen that when the length of the

209849/0816 " ^b "

Screw head is reworked, its exterior Profile is not changed at all, so that the operation of this screw by this rework in no way is affected. It is even possible for the manufacturer to provide only the tappets with the maximum length, which are to be used prior to installation in the watch Length can be adjusted, whereby the special property of each watch is taken into account without this any disadvantage can arise from subsequent dismantling. It is thus possible that on To reduce stock to be kept components considerably.

Of course, the screw head 14 could have any non-circular cross-section in order to enable it to be tightened or loosened with the aid of a tool. This head could therefore be square or elliptical or also corrugated. Obviously could the sleeve I _- pressed into the housing socket instead be screwed.

- Claims 209849/0815

Claims (2)

218 / 13.849 DE May 12, 1972 Patent application of the company LA NATIONALE. S.A, Geneva (Switzerland) 2, rue des Falaises Claims (Iy Waterproof plunger that has a sleeve attached to the socket of a watch case and a this sleeve includes displaceable plunger head which has a threaded bore in which a Screw is screwed, which extends lengthwise in the sleeve and one at the inner end this sleeve provided through hole and which has a shoulder that extends against the Edge of this hole is supported in order to limit the displacement of the plunger head to the outside, wherein 209849/0815 INSPECTED a return spring, which surrounds the screw, is housed in this sleeve, around the plunger head to move to the outside, characterized / that the section (l4) of the screw (12) protruding from the sleeve (1) is of non-circular cross-section to to enable them to be tightened or loosened with the help of a tool on the outer surface of this attacks non-circular section (l4). 2. plunger according to claim 1, characterized in that the outermost section the screw (12) is hexagonal in cross section. 209849/0815 Blank page