US3145674A

US3145674A - Pressure foot for sewing machines

Info

Publication number: US3145674A
Application number: US248962A
Authority: US
Inventors: Kurihara Michio
Original assignee: KOSHIN SEIMITSU KIKAI KK
Current assignee: KOSHIN SEIMITSU KIKAI KK
Priority date: 1962-06-12
Filing date: 1963-01-02
Publication date: 1964-08-25
Anticipated expiration: 1981-08-25

Description

Aug. 25, 1964 MICHIO KURIHARA PRESSURE FOOT FOR SEWING MACHINES Filed Jan. 2, 1963 ATTORNEYS United States Patent 3,145,674 PRESSURE FOOT FOR SEWING MACHINES Miehio Kurihara, Tokyo, Japan, assignor to Koshin Seimitsu Kikai Kabushiki Kaisha, Tokyo, Japan, a corporation of Japan Filed Jan. 2, 1963, Ser. No. 248,962 Claims priority, application Japan June 12, 1962 1 Claim. (Cl. 112-240) The present invention is concerned with an improvement in pressure feet for sewing machines.

Sewing machines as conventionally known generally include a pressure foot bar to which a pressure foot is detachably connected. For each type of stitching to be carried out by the sewing machine a corresponding type of pressure foot is connected to the pressure foot bar. For example there is a different pressure foot for a straight stitch or for hemming or the like and it is necessary to change the pressure feet in accordance with the intended type of stitch to be performed by detaching the pressure foot on the sewing machine and replacing with the correct type. This necessitates producing a complete pressure foot for each type of stitch and loosening and fastening a set screw on the sewing machine for changing each pressure foot which is relatively expensive and troublesome.

It is accordingly an object of the present invention to provide an improved pressure foot which has a shank detachably connectable to a sewing machine pressure foot bar and a pressure shoe quickly and easily detachable and attachable to the shank so that only the pressure shoe is produced and used for each type of stitching and the same shank can be used with all of the various pressure shoes.

Furter objects of the invention will be in part obvious and in part pointed out in the following detailed description of the accompanying drawings, in which:

FIG. 1 is a side elevation of a pressure foot according to the present invention which is shown connected to a conventional sewing machine pressure foot bar,

FIG. 2 is a cross-sectional view taken along the line 22 in FIG. 1,

FIG. 3 is a plan view of a pressure shoe forming a part of the present pressure foot,

FIG. 4 is an exploded perspective partial view of the same,

FIG. 5 is a front view of a shank also forming a part of the present pressure foot, and

FIG. 6 is an enlarged detailed sectional view of a portion of the pressure foot.

Referring now more in detail to the accompanying drawing, wherein like and corresponding par-ts are designated by similar reference characters, numeral 1 generally designates the present pressure foot which comprises a shank 2 and a pressure shoe 3. Said shank 2 has a longitudinal side groove 4 in its upper end portion and a slot 5 in said end for receiving the conventional foot bar 6 of a sewing machine and its connecting set screw 7, respectively as shown in FIGS. 1 and 2, whereby said shank 3,145,674 Patented Aug. 25, 1964 detachably extends from said pressure foot bar 6. Said shank 2 is forked at its lower end to form a pair of

arms

8 and 8 with an axle 9 fixedly connected to and extending between said arms 8 and 8'. Said pressure shoe 3 is provided on its upper surface with a pair of upwardly pro jecting

cars

10 and 10 having a pair of receiving grooves 11 and 11' provided in the upper surface thereof and also with a leaf spring 12 disposed between said pair of ears 10 and 10'. Said spring 12 is fixed at its rear end 13 to said shoe 3 and is free at its top front end portion 14, and said free front top end portion 14 is curved upwardly from the flat remaining portion of said spring into an arc positioned somewhat inwardly of the front or left hand inner surfaces of said grooves 15 and 15' of said pair of

grooves

11 and 11 as viewed in FIG. 6. The rear end 13 of the spring 12 may be fixed to said shoe 3 by any conventional means such as welding, bolting or the like, but in the embodiment shown on the drawing the same is enlarged in width providing a pair of laterally extending portions 16 and 16' and is fixed to said shoe by inserting said portions 16 and 16' into a pair of slits 17 and 17' provided in the rear surface of said ears 10 and 10'. Thus, by inserting said axle 9 into and across said grooves 11 and 11' until the same is held by said free front end of said spring 12, said shoe 3 will be detachably connected to said shank 2.

It is to be appreciated that pressure shoes 3 of other configurations than that shown can be used. Thus by selecting the proper shoe 3 for the stitch to be made it can be attached to shank 2 without removing the shank from bar 6 and the shoes can be interchanged as desired.

The present invention is capable of considerable modification and such changes thereto as come within the scope of the appended claim are deemed a part of the invention.

I claim:

A pressure foot for a sewing machine having a pressure foot bar comprising a shank detachably connectable to the sewing machine pressure foot bar, an axle carried by said sank, a pressure shoe, a pair of spaced-apart ears extending from said pressure shoe each having a top recess capable of receiving a portion of said axle and an end slit, a spring having a flat portion with a pair of laterally projecting portions each inserted in one of said ear slits connecting said spring to said pressure shoe and a curved free end portion extending laterally of and between said ear recesses and capable of detachably engaging and retaining said axle when in said ear recesses for connecting said pressure shoe to said shank.