US338753A - Watch-case pendant - Google Patents

Description

(Model.)

G. KISTLER.

WATCH CASE PENDANT.

No. 333,753. Patented Mar. 3o, 1386.

N. PEYERS, Mmm. Wm D-C UNITED STATES PATENT Ormea.

CASPER KISTLER, OF STERLING, ILLINOIS.

WATCH-CASE PENDANT.

SPECIFICATION forming part of Letters Patent No. 338,753, dated March 30` 1886.

Serial No. 172,250. (Model.)

.To @ZZ whom it may concern.:

Be it known that I, CAsPEn KrsTLER, a citizen of the United States, residing at Sterling, in the county of Vhiteside and State of Illinois, have invented certain new and useful Improvementsin Vatches; and I do herebyv declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or iigures of reference marked thereon, which forni a part of this specification.

Myinvention has reference to stem-winding watches, and pertains, specially and wholly,

to certain novel devices for closing the end of v the pendant to exclude dust, and at the same time furnish a permanent and eectual seat for the outer end ofthe winding-stem.

In stem-winding watches the crown serves as the4 head of the winding-stem. In all watches it is of the highest importance to close every possible avenue for the entrance of dust. The latter is sometimes of such afine impalpable character that a crevice which would seem too small to be objectionable will admit sufficient of such dust to affect injuriously, and sometimes permanently, the delicate mechanism of the instrument. So true is this that it is impracticable to use parts on the exterior of the watch which work on or against each other, as any part of the inclosure of the works, or the cover or cap of any avenue leading into the works.

A stem-winding watch is a great convenience, for obvious reasons; but heretofore ithas been difficult, if not impracticable, to close their inner cavity sufliciently to exclude fine particles of dust, particularly after the parts are somewhat worn.

In one class of stem-windersas heretofore made the crown has simply rotated on an inner cylinder, and the tting of the outer shell or crown on such inner cylinder as its pivot has been relied upon to exclude dust; but it is almost impracticable to iit such contiguous surfaces tightly enough to prevent the ingress of dust, and at the same time be loose enough to permit the crown to rotate, and if such fit were tight when the instrumentwas new it soon became loose from the wear of the contiguous parts, and the tighter was the fit in the first instance the greater was the attrition. The dust would work under the crown, and thence would have a free passage along the bed of the winding-stem into the works of the watch. In another class of stem-windersit has been attempted to avoid this difficulty by screwing the inner edge of the crown against the wall of an annular flange formed contiguously on the exterior of the pendant. This has beenaccomplished by forming a reverse exterior thread on the pendant and a corresponding thread on the inner walls of the crown. These threads had their action only when the crown was revolved reversely, and therefore the rotation of the crown in the operation of winding withdrew or unscrewed the crown from the fixed thread and from the seat of suoli crown, when the crown, having no or but a slight pivot to rotate upon, had a wabbling or oscillating movement, to avoid which watch-owners in winding would turn the crown forward but part of a revolution, then turn it backward the same distance, so as to prevent the crown from coming entirely off from the inner thread. Of course, such reverse rotation of the winding-stem had to be provided for bya ratchet, mechanism within the works of the watch, the repeated use of which rapidly wore out the parts involved. rIhis construction also gives the pendant a clumsy appearance.

The object of my invention is to furnish means for screwing on the crown after t-he winding is completed sufficiently tight to exclude all dust, and at the same time to provide a smooth, permanent, and sufficient pivot for the crown to rotate upon after it has been withdrawn from the thread, so that the winding of the watch may be continuous until completed.

In the drawings, Figure lis a sectional view of a pendant embodying my invention, exhibiting the crown screwed onto its seat. Fig. 2 is a like view with the crown withdrawn from its threaded seat, exhibiting its position during the process of winding. Fig. 3 is a detailed exhibit of the mode of seating the outer end of the windingstem B.

As my invention extends only to improve- IOO ments contained in the pendant of the watch, v

I do not deem it necessary to show or describe any other portion of the latter.

A is the pendant of the watch, integral with the watch-case A.

B is the winding-stem, seated longitudinally loosely in a corresponding and circular cavity.

A2 is the center of the pendant A, and extending entirely through the latter.

The inner end, B', of the winding-Stem B is formed with iiat sides, and adapted to t into and actuate the usual socket provided in the interior of the watch for the insertion of such winding-stem.

C is a screw seated transversely in the wall of the pendant A, and adapted to project into an annular recess, D, formed in the windingstem B, and of sufcient width to permit such stem to have the necessary longitudinal movenient to allow vits withdrawal from the threaded seat hereinafter mentioned, and at the same time prevent such stem from withdrawing entirely from the socket aforesaid. The head of the screw C is countersunk suiciently to permit the watch-case to close' down smoothly thereon, and can be placed at any convenient point.

E is the crown, on the inner end of which I is' formed the central boss, F, provided on its exterior with the thread F. In the interior of the crown E and around the boss F is formed the annular recess G. The adjacent end of the pendantA has an annular exterior reduction, L, sufficient to permit the outer end of such pendant to pass into the recess G of the crown E. On the inner wall of the pendant A are formed a few threads, M, corresponding tothe threads F on the boss F, and so located as to engage thelatter threads and draw the inner edge of the crown E tightly against the inner wall, H, of the reduction L by reversing the rotation of the crown E after theprocess of winding is completed. The reduction L is of sufficient length and extends far enough beyond the threaded portion M and into the recess G to form a pivot for the rotation of the crown E in the process of winding the watch, this after the boss F has been unscrewed from the threads M.

The outer end of the winding-stem B is of a square tapering formation, and is. inserted loosely into a square socket, t, in the boss F, and is held therein by means of a transverse screw, a, seated in a central projection, b, of the boss F, and projected loosely into a slot, d, formed transversely through one angle of the inserted square end of the stem B. rlhis loose connection of the outer end of the winding-stem B to the vboss F affords suiiicient lateral oscillation of the stem B in every direction to adjust the inner end of the latter to any possible variation in the locality or action of the socket into which the inner end of the stem is inserted.

N is the usual bow, attached in any suitabl mode to the pendant A.

As a substitute for the threads 'F and M, the usual zigzag slot and pin may be employed.

The operation of my invention is as follows:

Assuming the normal position of the partsV lto be as shown in Fig. 1, the crown E of the winding-stem B is grasped by the operator, and the latter rotated in the direction to wind the watch. The threads F and M having their engagement in the contrary rotation, the winding of the watch vdisengages such thread, and moves the winding-stem B outward until such threads clear each other. The screw C having now come in contact with the inner end of the recess D, lthe windingstem is prevented from further withdrawing. As the process ofwinding is continued, the crown E is supported rrnly by means of the outer end of the depression L traversing the recess or groove G. When the winding is completed, the crown E is screwed upon thc pendant A by a reverse movement, the outer wall of the recess D passing into the screw C. As the inner edge of the crown E fits tightly against the inner wall, H, of the depression L, the dust is wholly excluded, and as such contiguous parts do not slide on each other there is never any wear of either of such contiguous faces, and the original condition is not affected bysubsequent use.

What I claim as my invention, and desire to secure by Letters Patent of the United States, is

1. The combination of the pendant A, pro- 'vided with the interior thread, M, and external annular shoulder, H, the winding-stem B, provided with the annular recess D, the screw C, and the crown E, provided with the annular recess G, and internal boss, F, having the exterior thread, F, the boss F being Ithus adapted to be screwed into the open outer `end of the pendant A, and the outer end of the latter vto enter coincidently the recess G vuntil the inner edges of the crown E- shall abut against the shoulder H, substantially as shown, and for the purpose described.

2. The combination of the pendant A, provided with the interior thread, M, and external annular shoulder, H, the winding-stemB,hav

ing a limited longitudinal play in the pendant A, the crown E, provided with the annular recess G, and internal boss, F, having the exterior thread,F,thc boss F being thus adapted to be-screwed into the open outer end of the pendant A, and the outer end of the latter to coincidently enter the recess G until the inner edges of the crown E shall abut against the shoulder H, substantially as shown, and for the purpose herein specified.

In ytestimony whereof I affix my signature in presencecf two witnesses.

CASPER KISTLER.

Witnesses: f

V. S. FERGUsoN,

J. A.`M0RGAN.

Ico

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