April 28, 1925.
I A. O. THOMAS SEWING MACHINE ATTACHMENT F-iled April 1, 922
A 0. THOA/IAS JNVENTOR.
m4 MW/ A TTORNEY.
Patented Apr. 28, 1925.
ALONZO O. THOMAS, 013 DATIL, NEW MEXICO.
Application filed April 1, 1922. Serial No. 548,614.
To aZZ whom it may] concern.
Be it known that I, ALoNzo O. THOMAS, a citizen of the United States, residing at Datil, in the county of Socorro and State of New Mexico, have invented certain new and useful Improvements in Sewing-Machine Attachments; and I do hereby 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.
This invention relates to an attachment for sewing machines and more particularly to a presser foot attachment.
The object of the invention is to provide a presser foot of skeleton structure which will permit the continuous observation of the work under. the needle to permit stitching of fancy designs; the lettering of garments in stitching; darning, mending, buttonholing and blanket stitch, ruflling and sheering as may be desired.
A further object is to provide a presser foot under a continuous tension adapted tocontinuously engage the cloth being sewed. Further objects will appear in the course of the detailed description.
The invention consists in the novel structure, arrangement and combination of parts as hereinafter more particularly described and claimed.
One sheet of drawings accompanies this specification as part. thereof, in which like reference characters indicate similar parts throughout.
Figure 1 is an elevational view of the improved device in what may be termed its unwound position;
Fig. 2 is a bottom view of the device as shown in Fig. 1;
Fig. 3 is a perspective elevation of the device in its wound position ready for attachment to the presser bar, same being partly broken away to show the coiled tension spring;
Fig. 1- shows a"typical presser bar with an ordinary removable presser foot;
Fig. 5 shows the improved device substitinted for the ordinary presser foot of Fig.
Fig. 6 shows a modified form of the skeleton foot, and
Fig. 7 is an end elevation of. Fig. 6.
The improved device comprises a skeleton foot member 1 preferably formed from wire bent into a loop having its ends 2 inwardly directed to form an axis. The opposite end of the loop 3 is contracted into two relatively closely spaced side members H between which the needle is adapted to play, which parts l l are preferably bent downwardly into a lower plane than that of the loop proper while. the extreme end 3 is turned upwardly so that the lower faces of sides l l and end 3 form a rocking surface.
A holding member 7 which may be formed from a piece of sheet metal bent upon itself to form at the fold a hinge part 8 is provided, the bore of hinge part 8 being sufliciently large to accommodate a coil spring 9 and the ends 2-2 of foot member 1. One end of spring 9 is secured to foot 1 as at 10 and the other end is secured to holder member 7. The overlapping parts of holder member 7 may be provided with a laterally extending slot 11 and an angular attachment member 12 is secured to the upper face of holding member 7 as by bolt 14; and nut 15. The upstanding part of attachment member 12 is provided with a slot 13 adapted to be secured under thumb screw 18 on presser bar a. A yoke member 16 having its ends hooked as at 17 and extending beyond the sides of holder member 7 is secured under the head of bolt 14 and said hooks 17 are adapted to engage foot member 1 when the device has been removed from the machine to prevent the rotation of foot 1 more than one revolution so to avoid the unwinding of spring 9. Figs. 1, and 2 illustrate the device thus removed with hooks 17 engaging foot 1.
lVhen the device is applied, foot 1 is swung around to the position illustrated in Figs. 3 and 5 in which position coil spring 9 will exert a downward tension upon side parts 4-4: to hold same constantly in contact with the work as well when presser bar a is elevated as when it is depressed. Obviously, however, the tension exerted is less when presser bar a is elevated than when it is depressed and this difference in the tension permits the proper movement of the cloth to change its position under the needle.
In Figs. 6 and 7 a modified form of presser foot 1 is illustrated in which the side parts 4:& are shown bent into transversely extending loops 5 which are preferably upturned as illustrated in Fig. 7. In this type of presser foot the needle will operate centrally between loops 5-5 and 3 and the work will be held taut under the needle without Ill) liability to wrinkling regardless of the direction in which it may be moved relatively to the presser foot.
It will be obvious that many changes in detail of construction may be made in my invention without departing from the spirit thereof as expressed in the claims. It will be understood that the construction of means for attachment to the presser bar will be changed in each case as required by the form of the presser bar in use on the machine to which the attachment is to be applied. Likewise such details as the exact term of the stop member, the exact shape ot the presser toot, and other details of construction may be varied without departure from the spirit of the invention or the scope ot the claims.
Having thus fully described my invention. 1 claim:
1. In a device of the character described, a skeleton toot comprising a piece of wire bent upon itse f to form spaced cloth engaging parts and having its ends inturned to form a pivotal axis for said foot.
2. In a device of the character described, a skeleton toot consisting of a wire bent upon itselt to form a plurality of radially disposed cloth engaging loops lying in a common plane and having its ends then bent upwardly and then inwardly to form a pivotal mount for said foot.
3. In a device of the character described, a skeleton foot comprising a piece o'ii wire bent upon itself to form spaced cloth engaging parts and having its ends in-turned to term a pivotal axis for said foot, and resilient means for exerting a continuous downward pressure on said foot.
i. A device of the character described comprising a holding member provided with a hinge portion, a skeleton toot provided with inwardly turned ends pivotally mounted in said hinge portion, and a spring surrounding said ends adapted to normally hold said toot in depressed position.
5. A device of the character described comprising a holding member provided with a hinge portion, a skeleton toot formed with inwardly turned ends pivotally mounted in said hinge portion, a spring surrounding said ends and attached thereto to normally hold said foot in depressed position, and means for preventing the uncoilingo't said spring when said foot is detached.
In testimony whereof I afiix my signature.
ALONZO 0. THOl-IAS.