US2932269A - Presser feet for sewing machines - Google Patents

Description

April 12, 1960 L. J. KUHAR 2,932,269

PRESSER FEET FOR SEWING MACHINES Filed Aug. 30, 1957 INVENTOR.

Ludwig J. Kuhar WITNESS A T TORNE Y ited atent cc 2,932,269

Patented Apr. 12,

presser bar 10 carries a presser foot 11 having a shank 12 that is secured to the lower end of the presser bar .6 by a screw 13. The shank 12 includes a transverse plate I v 14 having a pair of spaced parallel depending flanges PRESSER FEET FOR SEWING MACHINES 15, Fig. 4. A main sole plate 16 is pivotally mounted on the shank 12 by means of a pair of pivot screws 17 z M ggggagg ggg g g5if 3:: threaded through the flanges 15 and having smooth sur- 1 g i g p faced stud ends 18 extending loosely through apertures poration of New Jersey t V t s in lugs 19 upstanding from the sole plate. l Application August 1957, serial 681,229 The bottom of'the ,main sole plate 16 is provided longitudinally with a groove 20 to accommodate a chain- Claims 112 235) ing foot 21 having a sole plate 22 and an upstanding The present invention relates to a presser foot for sewextend into recesses 24 in the opposite faces of the lug ing machines and more particularly to a so-called chain- 23 pivotally to mount the chaining foot 21 on the shank ing presser foot'which includes a pivoted presser foot The recesses 24 are elongated to comprise a lost and an independently mounted chaining foot that when motion connection PI'OVldlllg for bodily movement of the work in the machine has passed the needle, will opthe chaining foot 21 relatively to the shank 11 and mam erate to hold the enchained threads against the feed dog sole plate 16. The lug 23 is provided with a bore 25 durable, and eflicient in operation. In accordance with 25 tion 27, Fig.2, cooperating with the chaining foot 21.

the present invention these ObJCtS have been attained V The spring 26 biases the chaining foot 21 bodily downby the provision of a chaining presser foot in which wardly relatively to the main sole plate 16 as provided g t ere IS a single common pivot for both the main sole by the elongated recesses 24 and pivotally about the axis plate and the chaining foot and in which the chaining defined by the pivot screws 17 Pivotal movement of 2 foot also has limited bodily movement relatively to the 30 the chaining foot 21 relatively to the main sole plate 16 main sole plate in its normal operating range, i.e., during islimited by the binding of the lug 23 in the opening chaining, so that it will remain fiat relatively to the feed 16a in the sole plate throu h which it extends. With bias both the chaining foot and main sole plate pivotally 5 the heel of the sole plate 16 downwardly about the pivot Having in mind the above and other objects that will main sole plate 16 is limited by the enga ement of the be evident from an understanding of this disclosure, the top of the lugs 19 with the plate 14 as indicated in Fig. invention comprises the devices, combinations and ar- 3. In operation, the main sole plate 16 is forced downart readily to understand the function operation, conso that the main sole plate 16 lies flat against the work struction and advantages of it when read in conjunction with the spring 26 compressed. The chaining foot 21 with the accompanyingdrawing in which: also lies flat against the work and is freely movable present invention. the machine, the main sole plate cooperates with the Fig. 2 is a fragmentary sectional view similar to Fig. feed dog to feed the work. When the work passes from 1 but taken substantially centrally of the presser foot under the main sole plate, the enchained needle thread it assumes when it is raised from the wor a tively light action of thespring 26, the chaining foot 21 ,Fig 4 is a, detail sectional view taken substantially on yielding bodily againstjthe' action of the spring 26 to the,l ine4-4 ofFig. 1. V V p Withrefe'renceto the drawing, there is illustrated a the 'presserbar spring is absorbed by the engagement of sewing machine bed 1 having at the point of stitch formathe'main sole plate-16 with the throat plate 2 and feed tion an opening that receives the usual throat plate 2. dogs 4. A feed bar 3 carries feed dogs 4 which operate through When the presser bar 10 is raised to lift the presser slots, such as 5, in the throat plate 2 to feed the work. foot 11 from the work, the spring 26 acts first to move pverhanging the bed 1 is the head 6 of the machine the chaining foot 21 bodily until the stud ends 18 of with the loop taker (not shown) in the formation of extends, and finally acts to pivot the main sole plate 16 to its stop position as illustrated in Fig. 3. In this con- To hold the work against the throat plate 2 and feed struction, the spring 26 thus serves both as the bia the chaining foot 21 and also as the bias for pivoting ably mounted in the head 6 for endwise movement and the main sole plate 16. At the sam biased downwardly by spring means (not shown). The 22 of the chaining foot '21 is flat 3 of the feed dog and yields bodily to insure proper cooperation in the feeding of the thread chain.

Assembly of the presserfoot in accordance with this invention comprises only inserting the spring 26 into the bore 25', placing the lug 23 of the chaining fobt through the aperture 16d in the main sole plate, inserting the assembly between the flanges 15, and finally inserting the screws 17. The resultant device is very rigid, the flanges being in face contact with the outer surfaces of the lugs 19 to hold and guide the main sole plate in pivoting. 7

Numerous alterations of the structure herein disclosed will suggest themselves to those skilled in the art. However, it is to be understood that the present disclosure relates to a preferred embodiment of my invention which is for purposes of illustration only and not to be construed as a limitation of the invention. All such modifications which do not depart from the spirit of the invention are intended to be included within the scope of the appended claims.

Having thus set forth the nature of the invention, what I claim herein is: V t

1. A presser foot for a sewing machine comprising a shank adapted to be secured to the presser bar of a sewing machine, a main sole plate, a chainingfoot, common means for separately p'votally mounting said main sole plate and said chaining foot on said shank for pivotal movement of said chaining foot relatively to said main sole plate and said shank and defining a pivot axis, means providing for chaining foot relatively to the pivot axis thereof, and spring means between said chaining foot and said shank for biasing said chaining foot bodily within the. range of bodily movement and thereafter biasingsaid chaining foot pivotally about the pivot axis thereof, and means interconnecting said chaining foot and said main sole plate for pivotally biasing said main. sole plate upon pivotal movement of said chaining foot.

2. A presser foot for a sewing machine comprising a shank adapted to be secured to the presser bar of a sewing machine, spaced depending flanges on said shank, a main sole plate having spaced upstanding lugs disposed between said flanges, a chaining foot having an upstanding lug disposed between the lugs of said main sole plate, pivot means associated with said flanges and said upstanding lugs for pivotally mounting said mains foot on said shank on a:

sole plate and said chaining common pivot axis, and including a lost motion connection with said lug in said chaining foot tojprovide for limited bodily movement of said chaining foot relatively to the pivot axis, spring means between said chaining foot and said shank for biasing said chaining foot relatively to said shank, and means interconnecting said chaining foot and said main sole plate for pivotallybiasing said main sole plate upon pivotal movement of said chaining foot.

3. A presser foot fora sewing machine comprising a shank adapted to be secured to the presser bar of a sewing machine, spaced depending flanges on said shank, a main sole plate having spaced upstanding lugs dislimited bodily movement of said posed between said flanges, a chaining foot having an upstanding lug, said main sole plate having an aperture, said lug on said chaining foot extending loosely through said aperture in said main sole plate and disposed between the lugs of said main sole plate, said lug on said chaining foot having recesses in the opposite faces thereof, axially alined pivot screws threaded through said flanges and having stud ends extending loosely through the lugs on said main sole plate and into said recesses, said recesses being elongated to provide for limited bodily movement of said chaining foot relatively to said pivot screws, spring means disposed between said chaining foot and saidshank for biasing said chaining foot relatively to said shank, and means interconnecting said chaining foot and said main sole plate for pivotally biasing said main sole plate upon pivotal movement of said chaining foot.

4. In a sewing machine having a throat plate, a feed dog operable through said throat plate to advance the work, and a presser foot'opposed to saidthroat plate and feed dog, said presser foot comprising a shank, spaced depending flanges on said'shank, a main sole plate adapted to lie flat in engagement with said throat plate and feed dog and having spaced upstanding lugs disposed between said flanges, a chaining foot having a chaining sole plate adapted to cooperate with a section of said feed dog and having an upstanding lug, said main sole plate having an aperture, said lug on said chaining foot extending loosely through said aperture in said main sole plate and disposed between the lugs of saidmain sole plate, said lug on said chaining foot having recesses in the opposite faces thereof, axially alined pivot screws threaded through said flanges and having stud ends. extending loosely through the lugs on said main sole'plate and into said recesses, said recesses being elongated to provide for limited bodily movement of said chaining foot relatively to said pivot screws in a direction toward and away from said feed dog, and spring means disposed between said chaining foot and said shank for biasing said chaining foot bodily toward said feed dog within the range of bodily movement of said chaining foot as determined by the elongated recesses and for pivotally biasing said chaining foot when said chaining foot is lifted from the work and said pivot screws are engaged against the end of the elongated recesses, said lug on said chaining foot engaging against the edges of. the aperture in the main sole plate upon pivotal movement of said chaining foot relatively to said main sole plate to connect the same together for unitary pivotal movement.

References Cited in the file of this patent UNITED STATES PATENTS 621,147 Rontke Mar. 14, 1899 1,275,387 Chalman Aug. ,13, 1918 1,880,749 Bowman Oct. 4, 1932 2,147,128 Sailor Feb. 14, 1939 2,446,852 Sailor Aug. 10, 1948 2,487,285 Voigt Nov. 8, 1949

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