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Publication numberUS3757512 A
Publication typeGrant
Publication dateSep 11, 1973
Filing dateMay 5, 1972
Priority dateMay 24, 1971
Also published asCA952324A1
Publication numberUS 3757512 A, US 3757512A, US-A-3757512, US3757512 A, US3757512A
InventorsZellweger C
Original AssigneeWaldman Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Watertight pusher
US 3757512 A
Abstract
A watertight pusher device for watches or the like employs a tube having means for connection to the case of a watch, a spring mounted pusher head secured to the tube for sliding movement axially on the tube, and a screw member in threaded connection with the pusher head. The screw member has an inner head which extends out of the tube, the inner head having a diameter or dimension to provide a shoulder for engagement with the adjoining end of the tube. The pusher device is made to be useful for a range of watch cases having different wall thicknesses by providing the inner head with a non-circular outer surface adapted for mating engagement with a tool to rotate the screw member. The inner head has a length sufficient to allow it to be shortened without the loss of a sufficient area of purchase to enable rotation of the screw member. Also, the pusher head of the device is provided with a non-circular outer surface adapted for mating engagement with a tool so that the pusher head and the tube to which it is connected may be rotated.
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Description  (OCR text may contain errors)

Unite States Patent [191 Zellweger 1 WATERTlGI-IT PUSHER [75] Inventor: Conrad Zellweger,Chene-Bougeries,

Switzerland [73] Assignee: Waldman Corporation, Parsippany,

22 Filed: May 5,1972

[21] Appl. No.: 250,789

Primary ExaminerGeorge H. Miller, Jr. Attorney-Harry G. Shapiro [57] ABSTRACT A watertight pusher device for watches or the like employs a tube having means for connection to the case of a watch, a spring mounted pusher head secured to the tube for sliding movement axially on the tube, and a screw member in threaded connection with the pusher head. The screw member has an inner head which extends out of the tube, the inner head having a diameter or dimension to provide a shoulder for engagement with: the adjoining end of the tube. The pusher device is made to be useful for a range of watch cases having different wall thicknesses by providing the inner head with a non-circular outer surface adapted for mating engagement with a tool to rotate the screw member. The inner head has a length sufficient to allow it to be shortened without the loss of a sufficient area of purchase to enable rotation of the screw member. Also, the pusher head of the device is provided with a non-circular outer surface adapted for mating engagement with a tool so that the pusher head and the tube to which it is connected may be rotated.

12 Claims, 4 Drawing Figures PATENIEUSEPI H 3, 757. 5 1 2 FIG. 3 FIG. 4

1 WATERTIGHT PUSHER The invention relates to improvements in watertight pushers for watches or the like.

BACKGROUND OF THE INVENTION is locked a screw which extends longitudinally in the tube and out through an opening provided at the inner end of the tube. The screw is made with a slotted head, the head presenting a shoulder to engage the end of the tube adjacent the opening to limit the outward displacement of the pusher head. A compression spring is housed within the tube around the shank of the screw to resiliently urge the pusher head outwardly of the device.

Watch cases vary in wall thickness. To take care of the different thicknesses of the cases in which the pusher is threaded or secured, it has been the practice for pusher manufacturers to stock an assortment of screws with different head lengths. Given the tolerances necessary for the effective functioning of a chronograph, these pushers are very often finished after having been mounted in placeand the length of the head is reduced or decreased. As a result, the slot in the head of the screw is shortened to such an extent that disassembly becomes difficult if not impossible.

It has been proposed to overcome these difficulties by providing the pusher shaft with a retaining ring which is inserted into a groove and by lengthening the shaft by means of a partly tubular flange which may be adjusted to the length desired. Such an arrangement, however, complicates the assembly of the device and increases its cost.

It has been the practice to assemble watertight pushers on watch cases in separate parts. Traditionally, the pusher head of the device has been made of a circular contour. As a result, the pusher device may not be screwed onto the case in the assembled state of the device.

SUMMARY OF THE INVENTION The primary object of the invention is to overcome the aforementioned limitations and disadvantages of the prior art watertight pusher devices.

In accordance with the invention, the screw member of the assembly is made with an inner head which has a non-circular outer surface which is adapted for mating engagement with a tool for rotating the screw member. By eliminating the slot in the head, thelength of the head may be shortened or adjusted so that a screw member of only one size is useful for a substantial range of watch cases having different wall thicknesses. The

head of the screw can be cut to length at any time desired, and such operation can be accomplished on the assembled pusher. Also, the adjustment of the length of the head of the screw member does not involve any difficulty if it. is necessary to disassemble the device.

The pusher head or push button element of the device also is provided with a non-circular outer surface so that such surface may be engaged by a mating tool to enable rotating the pusher head and the tube to which it is connected. As a result, the pusher device may be locked to the center case of a watch in the assembled state of the device. Moreover, by making the non-circular outer surface of convex portions, an esthetically pleasing appearance is furnished in addition to the functional purpose which is served. Also, such contour of the pusher head easily distinguishes this part from the crown on the watch which is normally serrated or knurled.

These, and other advantages and improved results of the invention will be apparent from the following description of a preferred embodiment of the invention, taken in conjunction with the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross section of a pusher made in accordance with the invention, the device being shown connected to the center case of a watch; and

FIGS. 2-4 show several contours of the pusher head element of the device.

DESCRIPTION OF THE PREFERRED EMBODIMENT The pusher illustrated comprises a tube 1 having an externally threaded portion at one end to enable it to be threaded into a matingly threaded portion of a center case 2 of a watch. A pusher head 3 is mounted for sliding movement axially on the tube 1, and the pusher head is secured to the tube so that they may be rotated together. For this purpose, the parts are provided with mating grooves or splines 4 and 5.

The watertightness of the device is achieved by means of a sealing element or ring 6 held in an annular groove 7 formed at the upper end of the tube 1. The sealing element is held in the groove by a retainer ring 8. As shown, the sealing eement bears against the interior core or barrel 9 of the pusher head or push button 3.

The tube 1 presents an internal flange 10 with an opening 11 to permit the passage of the shank of a screw member 12. The screw member is threaded into the threaded bore 13 of the barrel 9 of the pusher head. The screw member 12 has an inner head 14 which provides a shoulder for engagement with the adjoining end of the tube. y

A compression spring 15 is positioned in the tube 1 and surrounds the shank of the screw member 12. One end of the spring bears against the internal flange 10 of the tube, and the other end bears against the end of the barrel 9 of the pusher head. As a result, the pusher head is urged outwardly, the outer displacement being limited by the engagement of the head 14 with the flange 10 of the tube.

The inner head 14 has a non-circular cross section and provides a non-circular outer surface adapted for mating engagement with a tool for rotating the screw member 12. Preferably, the head 14 has a hexagonal cross section. It will be evident that if the length of the head is altered or shortened, such alteration does not change the outer profile of the head. Thus, the manufacturer of the pusher device of the invention need stock only devices having screw members in which the heads are of desired maximum length to accommodate the most thick wall thickness of a range of watch cases with which the devices will be assembled. The screw member may have a predetermined length before being mounted onto a watch, taking into account the particuinconvenience or problem in subsequent disassembly. Thus, the pusher manufacturer may substantially reduce the stocking of parts. In addition, repair of the device is greatly simplified. If a pusher has to be replaced, the watch maker may buy a pusher and adjust it to the correct length by cutting or shortening the inner head of the screw member of the pusher. For example, the inner head of the screw member may be made with a length of approximately 4 mm.

Although it is preferred that the inner head 14 of the screw member have a hexagonal cross section, it is within the scope of the invention to make the contour square, elliptical, or oval. Also, instead of the tube 1 being formed with a threaded portion to enable it to be screwed into the case 2, such end of the tube may be formed to enable the tube to be force-fitted to the case.

As shown in FIGS. 2, 3 and 4, the pusher head 3 has a non-circular cross section to provide a non-circular outer surface or profile. As shown in FIG. 2, three convex portions a, b and having a radius of curvature R, are connected to one another by three convex portions d, e and f having a larger radius of curvature R In the form of the invention illustrated in FIG. 3, the cross section of the pusher head 3 comprises four convex portions each having a radius of curvature R the portions being connected to one another or coming together to form in the nature of a curvilinear square.

In the form of the invention illustrated in FIG. 4, the contour of the pusher head or push button presents two convex portions with different radii of curvature R, and R which furnish an elliptical shape.

In the three forms of pusher head illustrated, a tangent at the points of intersection of the convex lines does not intersect any of the lines.

It is also within the scope of the invention to shape the pusher head 3 by providing several convex portions wherein the radii of curvature vary progressively, the convex portions being connected to one another in a continuous fashion.

The non-circular outer surface or profile of the pusher head 3 is adapted for mating engagement with a female tool so that the pusher head, and consequently the tube 1 to which it is splined, may be rotated to effeet the connection and disassembly of the device from the center case 2 of a watch.

It is believed that the advantages and improved results of the invention will be apparent from the foregoing detailed description of a preferred embodiment of the invention. Various changes may be made without departing from the spirit and scope of the invention as sought to be defined in the following claims.

I claim: a

I. In a watertight pusher device for watches or the like comprising a tube having means for connection to the case of a watch, a pusher head secured to the tube for sliding movement axially on and for rotation with the tube, the pusher head having a threaded bore, a screw member threaded into the bore extending longitudinally in the tube, the screw member having an inner head extending out of the tube, the inner head providwhich vary progressively.

ing a shoulder for engagement with the adjoining end of the tube, and a com-pression spring in the tube surrounding the screw member to normally urge the pusher head outwardly of the tube, the improvement wherein the inner head has a non-circular cross section providing a non-circular outer surface adapted for mating engagement with a tool for rotating the screw member, said outer surface allowing the inner head to be shortened and still allow engagement by a tool to thereby enable the device to be used for a range of watch cases having different wall thicknesses.

2. In a watertight pusher according to claim 1 wherein the non-circular outer surface is hexagonal.

3. In a watertight pusher device according to claim I wherein the pusher head has a non-circular cross section providing a curvilinear outer surface adapted for mating engagement with a tool to rotate the pusher head and the tube therewith.

4. In a watertight pusher device according to claim 3 wherein the non-circular outer surface of the pusher head is formed of convex portions.

5. In a watertight pusher device according to claim 4 wherein the convex portions have a variable curvature.

6. In a watertight pusher according to claim 4 wherein the convex portions comprise three portions with a small radius of curvature connected by three portions having a larger radius of curvature.

7. In a watertight pusher device according to claim 4 wherein the convex portions have radii of curvature which vary progressively.

8. In a watertight pusher device for watches or the like comprising a tube having means for connection to the case of a watch, a pusher head secured to the tube for sliding movement axially on and for rotation with the tube, the pusher head having a threaded bore, a screw member threaded into the bore extending longitudinally in the tube, the screw member having an inner head extending out of the tube, the inner head providing a shoulder for engagement with the adjoining end of the tube, and a com-pression spring in the tube surrounding the screw member to normally urge the pusher head outwardly of the tube, the improvement wherein the pusher head has a non-circular cross section providing a curvilinear outer surface adapted for mating engagement with a tool for rotating the pusher head and the tube.

9. In a watertight pusher device according to claim 8 wherein the curvilinear outer surface of the pusher head is formed of convex portions.

10. In a watertight pusher device according to claim 9 wherein the convex portions have a variable curvature.

11. In a. watertight pusher device according to claim 9 wherein theconvex portions comprise three portions with a small radius of curvature connected by three portions having a larger radius of curvature.

12. In a watertight pusher device according to claim 9 wherein the convex portions have radii of curvature

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3453819 *Dec 15, 1967Jul 8, 1969Simon JohnControl device for waterproof timepiece
DE720611C *Dec 23, 1939May 11, 1942Henri ColombAufziehwelle fuer Uhren
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4120149 *Mar 11, 1977Oct 17, 1978Textron, Inc.Electronic watch
US4152889 *Jul 13, 1977May 8, 1979Citizen Watch Co., Ltd.Push button device for watch casing
US4346464 *Jul 2, 1980Aug 24, 1982Boninchi S.A.Control member for a water-tight watch
Classifications
U.S. Classification368/290, 968/341
International ClassificationG04B37/10, G04B37/00
Cooperative ClassificationG04B37/106
European ClassificationG04B37/10F