US1436743A - Watchcase screw - Google Patents

Description

H. E. WILD.

WATCHCASE SCREW. APPLICAHON FILED 050.13. m9

1,436,743. I Patented Nov. 28,1922;

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Patented Nov. 28, 1922.

UNITED STATES -HENRY E. WILD, GLENDIVE, MONTANA.

WATGHCASE SCREW.

Application filed December 13, 1919. Serial No. 344,568.

To all whom it may ooncevm:

Be it known that I, HENRY E. VILD, a citizen of the United States, residing at Glendive, in the county of Dawson and State of Montana, have invented certain new and useful Improvements in VVatchcase Screws, of which the following is a specification.

The movement of watches is generally secured within the case by one or more screws the latter having the pillow or post threaded into the frame of the movement and the head of the screw being arranged to engage an inner extension of the case. These fastening screws frequently become loose and permit the movement to have an appreciable play which is highly objectionable in time pieces of fine finish and relatively high cost.

The present invention provides means for securing the watch case screws against possible movement thereby holding the movement in the case a ainst any possible play.

The drawings 1 lustrate a referred embodiment of the invention. owever, it is to be understood that in adapting the same to meet different conditions, various changes in the form, proportion and minor details of constructlon may be resorted to without departing from the nature of the invention as claimed hereinafter.

Referring to the drawings hereto attached:

Figure 1 is a fragmentary view of part of a watch movement provided with a securing screw and locking means therefor embodyin the invention,

igure 2 is a sectional detail on the line 22 of Fig. 1, looking in the direction of the arrows.

Corresponding and like parts are referred to in the following description and indicated in the several views of the drawings by like reference characters.

The numeral 1 designates part of the frame or back plate of a watch movement. The fastening screw comprising a post 2 and head 3, the latter being slotted in the usual way to receive the point of a screw driver. In accordance with the present invention the edge of the head. 3 is toothed as indicated at 4.

The locking means for the fastening screw consists of a pillow 5 and a head 6 the latter being slotted to receive the point of a screw driver or other instrument whereby the screw may be turned. The edge of the head 6 is toothed as indicated at 7, and the teeth 7 are adapted to engage the teeth 1 of the fastening screw in a given relative position of the parts. The heads 3 and 6 are of circular outline. The head 3 is concentric with the screw post 2. The head 6 is disposed eccentric with reference to the pillow 5. The recess 8 is formed in the outer side of the plate of the movement to receive a portion of the head 6. In practice the screw post 2 and the screw pillow 5 will be of a length to engage both the top and bottom plates comprising the frame of the movement.

In practice the two screws are threaded into the frame of the movement, the fastening screw being so disposed that the outer portion of its head 3 will engage the inner latch of the case in a manner well understood. The lock screw is turned so that its teeth 7 will clear the teeth 4 of the fastening screw and after the movement has been placed in position in the case and the fastening screw turned so as to engage the inner extension of said case the lock screw is turned in a clockwise direction until the teeth 7 engage the teeth 4 after which the fastening screw is turned slightly in a counter clockwise direction thereby causing the teeth 4 to bind with the teeth 7 and prevent any possible backward movement of either the lock or the fastening screws. It is observed that the post- 2 and pillow 5 are formed with right threads. The invention is designed for railroad watches and other like time pieces required to operate under all conditions and indicate correct time. By having the fastening screw positively locked, it cannot possibly become loose and admit of the movement having a play which is objectionable and tends to render the watch not dependable for accurately indicating the time.

Having thus fully described my invention what I claim as new and desire to secure by Letters Patent, is

The combination with the frame or back plate of a watch movement having a recess therein, of a fastening screw threaded into the plate adjacent the recess and having a head provided with a gear toothed periphery concentric to the shank of the screw and partially overhanging the recess; a locking screw threaded into the plate within the recess but eccentric thereto, said locking screw having an eccentrically disposed head provided with peripheral gear teeth, the eccentricity of the head in relation to its shank and the shank in relation to the recess being In testimony whereof I aflix my signature such as to cause eiligagement of the teeth on in presence of two witnesses. said head with t e teeth on the fastening screw when turned in one direction and with HENRY WILD 5 the wall of the recess when turned in the Witnesses:

other direction whereby movement of said ALBERT SoMMERNEss, locking screw in one direction is limited. LEONON J. GUY.

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