US227504A - Watch-case spring - Google Patents

Description

W. DRYSDALE. Watch-Case Spring.

No. 227,504; Patented May 11, 1880.

UNITED STATES WILLIAM DRYSDALE, OF

PATENT OFFICE.

LOUISVILLE, KENTUCKY.

WATCH-CASE SPRING,

SPECIFICATION forming part of Letters Patent No. 227,504, dated May 11,1880,

Application filed October 15, 1870.

To all whom it may concern Be it known that I, WM. DRYSDALE, of Louisville, in the county of Jefferson, and in the State of Kentucky, have invented certain new and useful Improvementsin VVatch-Gases and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, in which Figure l is a perspective view of my improved case hinge and spring separated from each other and from the case. Fig. 2 is a like View of said parts in position within a case. Fig. 3 is an elevation from the inner side of said parts. Fig. 4 is a perspective view of the catch piece and spring separated from each other and from the case. Fig. 5 is an elevation from the inner side of said parts, and Fig. 6 is a plan View of said springs.

Letters of like name and kind refer to like parts in each of the figures.

The design of my invention is to render a watch-case dust-proof at the points where the case-spring and catch-piecepass outward and to this end it consists, principally, in a shut spring and catch-piece made separate from each other and adapted for connection after the former is in place within the case, substantiallyas andforthe purpose hereinafter shown.

It consists, further, in a shut-sprin g provided with a lug which receives the catch-piece and incloses from below the opening in the casecenter through which said catch-piece passes inward, substantially as and for the purpose hereinafter set forth.

It consists, finally, in the construction of the shut-spring and catch-piece and their combination with each other and with the case, substantially as and for the purpose hereinafter shown and described.

In the annexed drawings, A represents a case-center provided with a front, 13, and bezel 0, each of which latter parts is hinged to or upon said case-center in the usual manner.

From the hinge portion of the case-front B a lug or arm, 1), extends inward in a curved line, of which the axis of the hinge is the ce11- ter. Said arm is rectangular in cross-section and closely fills the opening a in said case-ecu arm is above the line to which the edge ofthe bezel O shuts down, a notch, c, is provided within the latter for the passage of said arm. The inner end of the arm I) is hollowed out, as shown in Fig. 1., and fits over and engages with the end (I of a case-spring, D, which has the usual form, except that its free end dis straight and round, instead of having the usual outward-projectinglug for engagement with the hinge of the case-front. If, now, the casefront B is closed, the curved arm 1) moves the free end (1 of the spring D rearward and downward, instead of giving to said spring a twisting strain, as in case of springs of ordinary construction, by which means there is less than usual liability to injury and breakage, while from the lllUlBiLSGil leverage upon said case-"front, secured by use of the curved arm, the joint is never strained, and receives none of the usual wear that is occasioned by the end of the spring of ordinary form.

In consequence of the concentric form with relation to the hinge-axis given to the arm I), it may be caused to fit so closely within the openings a and c at all points of its movement as to effectually prevent dust from passinginto the interior of the case at such point.

The shut-spring E has the form shown in Fig. 4, its rear end being fitted to the concavity of the inner side of the case-center A, and provided with the usual threaded opening 0 for the reception of a fastening'screw, c. From the thick rear portion of said spring to its front end it is made thin, as shown, and at a point near said front end is provided with a lu c that has a s nare form in )lan view and is provided with a threaded opening that receives the threaded shank f of a catch-piece, F, which above said shank has the usual form.

In use, the spring E is placed within and secured to the casecenter in the usual manner, with its lug 0 directly beneath the opening a, that is provided within the inward-projectin g flange of said case-center for the passage of the shank of the catch-piece F, said lug being arranged to bear against the lower side of said flange, and, having horizontally considerablylarger dimensions than said opening, effecttually closes the latter against the passage of dust. The catch-piece is now placed in positer which is provided for its passage. As said 1 tion by screwing its shank f into the lug 6 atter which said parts operate in the usual man-.

ner. The projecting outer end of the spring E receives the inner end of the push-pin G, and enables the latter to move said spring inward in the usual manner.

By use of my case-spring and shut-spring a watch-ease maybe made so close as to prevent the inward passage of dust, and to render unnecessary the various expensive methods for inclosing the movement and rendering the same dust-proof.

Having thus fully set forth the nature and merits of my invention, what I claim as new is 1. A shut-spring and catch-piece made separate from each other and adapted for connection after the former is in place within the ease, substantially as and for the purpose shown.

2. A shut-spring provided with a lug which receives the catch-pin and ineloses from below the opening in the case-center through which said catch-pin passes inward, substantially as and for the purpose set forth.

3. The shut-spring E, provided with the lug e and the catch-piece F having a threaded shank f, in combination with each other and with the ease-center A, substantially as and for the purpose shown and described.

In testimony that I claim the foregoing I have hereunto set my hand this 4th day of October, 1879.

WM DRYSDALE.

W'itnesses: a

W. KENDRIeK, FE. AL. ZUMAR.

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