US2268749A - Watch stem bushing - Google Patents

Description

Jan. 6, 1942. c. B. GREENBERG 2,268,749

WATCH STEM BUSHING Filed Feb. 14, 1940 INVENTOR Charles B Grtenbars ATTORNEY Patented Jan. 6, 1942 UNiTED STATES PATENT OFFICE.

WATCH STEM BUSHING Charles B. Greenberg, New York, N. Y. Application February 14, 1940, Serial No. 319,647

4 Claims.

My invention relates to Watches, watch cases, and watch sundries, and in more detail, to a winding stem bushing capable of gripping and holding the watch case halves and thus preventing dust filtration through the stem opening into the watch case and the watch movement.

There are, in use at present, several types of bushings which encase the watch stem and rest each side of the case. These bushings although made either by flaring or by rigidly attaching a flange at each end of a tube, cannot actually grip the face of the case except by an accidental fit. Thus they neither seal the opening about which they rest nor remain firmly secured in position or prevent dust from entering into the watch and its movements.

It is an object of my invention to so construct my bushing that it will grasp and hold the halves of the case around and on both sides of the stem opening and thus seal this opening. It is a further object of my invention to construct a spring motivated bushing in order to provide positive gripping action on the watch case.

In order to accomplish these and other objects, I form my bushing in two parts with a spring encased therebetween so constructing each part that an opening is formed between the two parts and the two parts are urged by the spring toward each other and grip any object held in the opening between them.

Further and more specific details and objects of my invention will be shown and described in the accompanying drawing in which Figure 1 is a section through the center of a crown with my invention inserted therein and holding the halves of a watch case.

Figure 2 is a detail.

Figure 3 is a plan view of the under part of my invention shown in Figure 1 and,

Figure 4 is a vertical section through the center showing a modified type of my bushing.

In the drawing my invention I, illustrated in both Figures 1 and 4 is shown functioning and in position in a crown 2 and resting on, gripping and holding the halves 3 and 4 of a watch case. While the watch case halves are provided with the customary semicircular stem openings 5 to permit the passage of the stem of the watch movement, the crown 2 is of the common type which is provided with the hollowed well part 6, the tube stem winding element I in the center of the well 6 and the circular well side wall 8.

My invention I as shown in Figure 1 and assembled with the above described crown and watch case is comprised of a cup shaped element II having a side wall l2 and a bottom I3, the latter part provided with a center opening I4. Extending through the center opening I4 is a tube I5 provided at its lower end with the outward extending flange I6 and at its upper end with the rolled or outward flared tip IT. A coiled spring I3 rests between the cup wall and tube on the cups bottom and is held in compression by the washer l9 and is prevented from escaping by the flared tip IT. The cup element II is of a proper size and shape as to fit within the hollowed well part 6 of the crown, while the tube I5 is large enough to allow the winding element I to extend therein.

Thus the spring acting through the washer I9, the flared tip I1, and the tube I5 continuously forces the face of the flange l6 toward the bottom of the cup l3.

When this bushing is positioned in the crown well the side I2 of the cup element rest adjacent the side wall of the crown and the stem I of the crown extends into the tube I5 of the bushing. The bottom I3 of the bushing rests a short dis tance beyond the end of the crown wall and the watch case halves are gripped in the opening between the bottom I3 and the flange I6 and held by these two parts. The tube l5 rests in the cut out stem openings 5. By this construction no space is left adjacent the stem openings and there is no chance for dust to enter the case between the stem of the movement and the case opening.

A variation of the flange I6 is shown in Figure 2. The flange I6 is circular and larger than the stem opening but the flange 20 shown in Figure 2 is lengthened out into an oblong like shape fitting the inside of the case of the watch and so providing a greater bearing area.

The variation of my invention shown in Figure 4 is comprised of a cup shaped element 33 having the side wall 3| and bottom 32. The bottom is provided with the opening 33. Extending through the opening 33 is the tube element 34 which is provided at its upper end with the flange 35 and at its lower end below the bottom 32 with the flared tip or flange-like end 36.

This variation rests in the crown similar to the bushing described shown in Figure 1 but the watch case halves are gripped by the bottom 32 of the cup and the flange tip 36. The spring 3'! resting in the cup 30 and held between the bottom 32 and the flange 35 continuously forces the flanged tip 36 toward the bottom 32 thus gripping and holding the watch case halves resting therebetween.

As the details described in the drawing show only a few forms of my invention and since many changes and modifications may be made in the same invention without changing or departing from the spirit and scope of the basic idea, I desire to cover all modifications, forms and embodiments coming within the language of any one or more of the appended claims.

I claim:

1. A bushing for a watch case comprising a cup-shaped element having a bottom and a side wall and an opening in said bottom, a tube shaped element having a flange at one end and an enlarged portion at the other end, said tube extending in the opening in the bottom and the flange resting below the bottom and the enlarged portion inside the cup, a spring resting in the cup between the cup wall and the tube, and a washer in the cup and about the tube and below and held by the enlarged portion of the tube, the spring acting against the bottom and respectively through the washer, the enlarged portion of the tube and the tube, against the flange to force the bottom and flange toward each other.

2. A sleeve for a watch case and watch movement comprising a cup shaped element having a side wall and a bottom and said bottom having an opening therein, a tub element extending through the opening in the bottom having at one end a flange and at the other end below the bottom a flared flange-like enlarged section, and a spring within the side wall of th cup and about the tube and resting on the bottom and exerting pressure between the bottom of the cup and the flange of the tube to force the flange-like enlarged end toward the bottom of the cup.

3. A sleeve for use with a crown and a watch case comprising a cup shaped element having a side wall and a bottom, the bottom having an opening therein, a tube element extending in the opening in the bottom and having a flange at the end of the tube below the bottom and a flared tip at the end extending in the cup, a spring within the cup, and a washer resting on the spring and held thereagainst by the flared tip of the tube, the flange of the tube being oblong shaped in order to permit increased bearing against the watch case.

4. A bushing for a watch case and watch movement comprising a coiled spring, a first tube having two outward extending flanges and a second tube concentrically positioned about said first tube and having an inward extending flange located between the flanges of the first tube, and the said spring positioned between the tubes and between the inward extending and one of the outward extending flanges and functioning to cause compressive pressure between the other of the two flanges and the inward extending flange.

CHARLES B. GREENBERG.

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