US1037577A - Means for fastening the movements of watches in the cases. - Google Patents

Description

A. J. BAKER.

MEANS FOR FASTENING THE MOVEMENTS 0P WATCHES IN THE GASES; APPLIGATION FILED DEC. 30, 1911.

1 .037,577. Patented Sept. 3, 1912.

%. W GWOLMM ALLEN J. BAKER, 0F

MEAN$ FOR Specification of Letters Patent. Application filed December 30, 1911.

STEWARTSTOWN, PENNSYLVANIA.

FASTENING THE MOVEMENTS OF WATCHES IN THE CASEEL Patented Sept. 3, 1912.. Serial No. 668,647.

To all whom 2'25 may concern.

Be it known that I, ALLEN J. BAKER, a citizen of the United States, residing at Stewartstown, in the county of York and State of Pennsylvania, have invented certain new and useful Improvements in Means for Fastening the Movements of Watches in the Cases, of which the following is a specification.

My invention relates to improved means for fastening the movements of watches in their cases.

common way for holding a watch movement in its case consists in providing the rear plate of the movement with a screw having an eccentric head, or a broad head with one side out vaway,th said screwhead being slotted to permit the engagement of a screw-driver. The broad part of the head when turned a certain way overlaps on the case-rim and thus holds the movement firmly within the case, and when the screw.- head is turned to place its cut-away or flat side next to the case-rim, the movement is released. This familiar device has the objection that this screw after a time works loose or partly turns by accident so as to release the screw-head from its engagement with the case, and then the movement at once becomes loose in the case.

The invention is illustrated in the drawing and will first he described and then pointed out in the claim.

Figure 1 shows a watch with the back open and exposing to view the movement and -shows the present improvement. Fig. 2 is a view on a larger scale, of the improved lock screw and a screw having an eccentrichead to hold the loclescrew. Fig. 3 is a perspective view of the lock screw.

The watch case rim is designated by the numeral, 1, the rear plate of the watch movement by 2, the lock screw by 3, and a second screw Whose head, 4, is eccentric or has a flat cut-away. The watch movement is inserted into the case as usual from the front or dial side, and when the movement is in proper position the lock-screw, 3, is inserted so as to cause its head to overlap on the inner flange of the case-rim, 1, which surrounds the movement. This lock screw has a head whose rim is provided with a plural number of notches or faces, 5; the number of rim-notches shown in the present instance is eight, but as some other number would serve the purpose, the invention,

therefore, is not restricted to The head of this lock-screw may have a diametrical slot to permit theengagement of an ordinary screw-driven, The screw with the head or rim, 4, cutaway or flattened at one side adjoins the said loclescrew, 3, and these two heads, 3, 4, have such position that the round art of the head or rim, 4, will contact with one of the rim-notches, 5, of the lock-screw, as shown in the drawing, and such contact prevents the lock-screw from turning. When it is desired to turn the lock-screw, 3, it is firstnecessary to turn the head, 4, and place the flattened or cut-away part of its rim alongside of but without touching the notches, 5, of the lock-screw, then the lockscrew may either be tightened or loosened, or entirely removed. 7

The head, 4, that has a rounded art and a cut-away or flattened part, must e capable of turning or revolving on its center, but it is not essential-that this head shall have a stem provided with a screw-thread.

If it should be desired to take the movement from the case, 1, the first thing to do is to turn the head, 4, so as to release the rounded part. of its rim from contacting with the notch, 5, of the lock-screw, 3; next the screw, 3, must be turned and entirely removed, and then the watch movement is free to be removed from the case.

This device for fastening watch movements in their cases results in advantages not afforded by the fastening commonly used. Heretofore the eccentric screw-head on the movement has been employed to over lap the rim-flange of the watch-case, and the watch repairer in endeavoring to hold the watch movement tightly has often turned the eccentric-head to bind on the rim-flange so hard as to cause either one of two objections-one being to cause the head to indent the soft metal of the rim-flange of the case, and thus injure it, and the other being to strain and w alien the screw where the eccentric-head connects with its threaded stem, which shortly otter causes said head to break oli' from its stem, and the loose head then gets into the moving parts and stops the watch. By the use of my device the lock-screw, 3, may be turned so that its notched head, 5, will merely contact with the rim-flange of the case without pressing it tightly; this will fasten the movement properly; then the eccentrici ,a a n head, 4-,Wiii engage one of the notches on the lock-screw and hold it from becoming loose or turning back. In my device there need not be an indent or injury to the rimflange, and as the lock-screw need. not be right there Will be no such strain on the head of the lock-screw as to weaken it or cause it to break ofi.

i-iaving thus described my invention What It ciaizn and desire "to secure by Letters Patce for fastening a Watch movement 7 consisting of the combination of having the u sual rim-fiange at s-de; a Watch-movement having a with notches, said lock-screw bea took-screw Whose head rim is ALLEN J BAKER.

signature Witnesses CARL N. W

ILEY, C. MILTON Lows.

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