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Publication numberUS2482607 A
Publication typeGrant
Publication dateSep 20, 1949
Filing dateApr 12, 1946
Priority dateApr 12, 1946
Also published asDE906885C
Publication numberUS 2482607 A, US 2482607A, US-A-2482607, US2482607 A, US2482607A
InventorsAlmquist Nils T
Original AssigneeGreist Mfg Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Buttonhole attachment for sewing machines
US 2482607 A
Abstract  available in
Images(2)
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Claims  available in
Description  (OCR text may contain errors)

Sept. 20, 1949. N. T. ALMQUIST" 2,482,607

BUTTONHOLE ATTACHMENT FOR SEWING MACHINES Filed April 12, 1946 2 sheets-sheet 1 Sept. 20, 1949. N. T. ALMQUIST 2,482,507

BUTTONHOLE ATTACHMENT FOR SEWING MACHINES Filed April 12, 1946 2 Sheets-Sheet 2' Patented Sept. 20, 1949 UNlTEiD YQSTATES PATENT OFFICE BUTTONHOLE'ATTACHMENT FOR SEWING r MACHINES Nils T. Almquist, New Britain, Conn., assignor to The Greist Manufacturing Company, New Haven, Conn., a corporation of Connecticut Application April 12, 1946, Serial No. 661,555

18' cl ims.

- This invention relates to sewing machine attachments, and more particularly .to a buttonhole. attachment. for sewing machines; The invention also relates particularly to the. provision of an attachment. of .this character for use withordinaryfhousehold sewing machines, and in the operation of the present device in stitching a buttonhole the work is reciprocated laterally for the formation of the buttonhole stitches and also fed lengthwise of the buttonhole to stitch alongone side thereof. When the line of stitching reaches the end of the buttonhole or the end of thefeed, the. feed will be reversed and the material shifted laterally or transversely of the line of stitches, so that the opposite side of the buttonhole will be stitched. All of the above operations areperformed automatically, so that a continuous line of stitches entirely surrounding the buttonhole will result without the necessity forany intervention of the operator.

The stitching upon each side of the buttonhole is somewhat in the nature of a zig-zag' stitch, and it is advantageous that the lateral oscillatory movements of the feed blade whichproduce this stitch be capable of adjustment in order to adjust the width of thesestitches r thebite, as this is usually called. It is also desirable that the spacing of the two lines of stitching be ad justable so as to vary the distance between the median line of stitching on one side of the buttonhole and the median line of stitching on the other side thereof to make wide or narrow buttonholes. A third adjustment is also meets sary, which is the adjustment of the length of the line of stitching in order to make buttonholes of difierent lengths. ,In order words, with such an attachment it is necessary that a buttonhole of any size, within limits, be possible and that the bite or the width of the stitch at each side of the buttonhole also be varied.

One object of the present invention is to provide a new and improved buttonhole attachment for sewing machines which will be efiicient in operation and which will be of relatively simple construction.

A further object of the inventionisto provide a buttonhole attachment for sewing ma'chines which will possessall of the necessary adjustments for the making of buttonholes' of different sizes, which adjustments may be made in a relatively simple manner so that-they'may be made by any userof the machine.

A still further object of the invention is to provide a buttonhole attachment for sewing machines which .will be comprised of relatively few parts and be relatively-[simple in construction, andwhich will, atthe same time, have all of the necessary adjustments required in a device of this kind.

To these andot'her ends the invention consists in the novel features and combinations of parts to. be hereinafterdescribed and claimed.

In the accompanying drawings:

Fig. 1 is a side elevational View of a buttonhole attachment for. sewing machines embodying my invention; V

Fig. 2 is a top-plan view of the same;

. Fig. 3 is a sectional view on line 33 of Fig. 2;

Fig. 4 is a fragmentary sectional view on line 4-4 of Fig. 3;

Fig. 5 is a sectional view on line 55 of Fig. 3;

Fig. 6 is a top plan view of the feed blade apart from the remaining structure;

, Fig. 7 is a top plan view of one of the rack units or templets detachably secured to the feed blade;

Fig. 8 is a similar view of a rack unit or templet of difierent shape;

Fig. 9 is a view similar .to Fig. 4 showing a slight modification of my device;

Fig. 10 is a sectional view Fig. 9; and.

Fig. 11 is a. diagrammatic view of the type of stitch effected by the attachment.

To illustrate oneembodiment of my invention, I haveshowna .buttonhole attachment for sew ing machines comprising a supporting frame comprising a base plate Ill having attaching means It thereon by which it may be secured to the presserbar of the sewing machine.

Upstanding from this base plate are a pair of spaced standardsl'2 .in which are rotatably mounted a cam roll l3 havingacam groove M therein of zig-zag shape intended to impart oscillatory movement to axcamv follower received therein, as will be hereinafterexplained, this oscillatory movement 'being'in a direction laterally or transversely of the longitudinally dimension of the attachment.

The camroll or .wheelil3 is designed to be opera-rated in a step-byJ-step movement, and for this purpose an actuating le'ver I6 is pivoted on the shaft I! of the wheeLthis lever'being provided witha forked endl8 tobe attached to the needle bar in the usual manner. Thelever I6 carries a pawl is urged bya' spring 20 into engagement witha ratchet wheel 2| made rigid with the cam 13 so:that operation'of the ratchet wheel in a step-by-step movement by reciprocation or oscilon line 10-10 or lation of the lever 16 will effect step-by-step movement of the cam.

A lever 23 is pivoted at 24 to a bracket 25 carried by the base plate l0, this lever having on its forward end a follower 26 disposed in the cam track or groove 14, so that as the cam l3 rotates the lever 23' will be oscillated about its pivot 24.

t will be noted that the lever 23 is relatively wide at its rear end and is in the form of a flat plate. Upon the rear end of this lever is mounted a bearing bracket 21, and the hub: 28 of a ratchet wheel 2% is rotatably mounted in this bracket and in the lever 23. Secured to this hub is a shaft 35 which extends through the lever 23 and terminates in a downwardly projecting pin 3L Formed integrally with, or rigidly secured to this shaft, is a pinion 32 disposed below the lever 23,

A bridge member 33 is secured to the supportin plate it, this bridge member being disposed'in a position spaced above the plate and overlying the ratchet 29. Pivotally-mounted at the lower surface of the bridge member 33 isa pawl 34 urged by a spring 35 into engagement with the ratchet wheel 25. l l

It will be remembered that the plate or lever 23 rotatably carrying the pinion 32 is oscillated laterally of the longitudinal dimension of the attachment by rotation of the cam wheel 53, this oscillation taking place in an up-and-down direction as viewed in Fig. 4. From this figure, it will be apparent that, as the pawl 34 is mounted on a fixed part of the frame of the device, the oscillation of the lever 23 and the ratchet wheel 29 carried thereby will effect step-by-step rotation of this wheel and of the pinion 32. Movement of the ratchet wheel toward the bottom of the sheet, as viewed in Fig. 4, or away from the pawl will result in the latter riding idly over the teeth of the wheel, while movementof the lever 23 and the wheel in the opposite direction, or toward the top of the sheet of the drawing, will result in the engagemet of the pawl with the teeth of the wheel and the rotation of the 'latter'and, therefore, the rotation of the pinion 32. Therefore, each movement of the lever 23 in one direction effects a partial rotation of the pinion 32..

' An adjusting lever 36 is slidably mounted with respect to the supporting plate In, the forward end of this lever being bent downwardly, as shown at El, and carrying apivot pin 38 slidably mounted in a slot 39 in the plate, sothat the lever can be adjusted with respect to the plate. At its rear end, this lever passes through a stirrup 40 secured to the bridge 33 and is provided at its upper surface with a plurality of notches or teeth 41 adapted to be forced into engagement with the upper portion of the stirrup by a leaf spring 42. A fingerpiece 43 is mounted upon the lever so that it may be depressed by pressure of the finger thereon and the teeth 4! released from the stirrup to permit adjustment of the lever in the slot 39. Thus, while the lever 36 may be adjusted longitudinally of the plate l0, it will be held in any given position by engagement of the teeth 4| with the stirrup 40.

A feed blade 45, shown in detail in Fig. 6 of the drawings, is mounted below the plate II] for both sliding movement in a longitudinal direction and oscillatory movement in a direction transverse to the longitudinal dimension of the attachment. This feed blade is provided with a slot 46 which slidably receives the pivot pin 38 upon the lower end of the adjusting lever 36, the head-41 of the pivot pin (Fig; 1) securing the blade against detachment from the pin. Thus this blade may wing or oscillate .aboutthepivot pin 38 and also slide longitudinally relatively to this pin as permitted by the slot 46.

Adjacent its front end a presser foot or feeding foot 48 is pivoted at 49 to forwardly extending legs 56 of the blade 45. The presser foot 48 may be roughened upon its lower surface 5|, as is usual, so as to engage the goods and properly feed the goods'both longitudinally and laterally of the device during its operation. It will be understood that the attachment is employed in connection with a cover plate (not shown) which covers up the usual feeding mechanism of the sewing machine, so that the entire feed of the goods is obtained through the foot 48 and feed blade 45 to which the foot is pivoted.

Adjacent its rear end the feed blade 45 is provided with an opening 53, this opening being preferably of keyhole shape in that it is enlarged at its rear end, as shown at 54. Within this opening is snugly, but freely, received the frame 56 of a rack member or unit, which member is provided adjacent its'outer wall with an endless series of rack teeth 51. This memberis also provided with an oblong or oval groove or track 58 within the series of teeth 51,. the series of teeth also being of oval or oblon shape in this form of my invention. Adjacent its outer edge the frame 55 is provided with a. laterally extending flange 59 adapted to abut against the lower surface of the blade 45 about the edges of the opening 53, as shown, for example, in Fig. 3.

As will be apparent from Figs. 3 and 5, when the rack unit 55 is in place it will project forwardly through anopening Ell in the supporting plate Hi, this opening being relatively large so as to provide for the sliding and lateral movements of the feedblade 45 and the rack unit which is carried thereby. Also, the pilot pin 3i on the lower endof the shaft 30 is received in the groove or track 58'of the rack unit, and the pinion 32 is also received in this unit and its teeth engaged with those of the rack 51.

From the above description it will be apparent that, as the pinion is rotated, the rack member 56 and rear end of the feed blade will be caused to travel in a more or less generally oval path as determined by the engagement of the pilot pin 3| in the groove 58. It may also be noted that this pilot pin serves to connect the oscillating lever 23 with the feed blade 45 so, that, as the lever is oscillatedbythe cam I3, the rear end of the feed bladewill likewise be oscillated, thus effecting an oscillatory movement of the presser foot 48 and .of thematerial engaged by the presser foot, so as to elfect the zig-zag line of stitching at each side of. the buttonhole.

As has been stated above, the rack member 58 is freely, though snugly, received in the opening 53, so that it may be replaceable by a difierent unit having thesame outside dimensions but having a-series of Irack teeth and groove 58 of different length or shape, so as to make buttonholes of different length, shape, or width. For example, as shown in Fig. 8, a rack unit BI is shown which may be inserted into opening 53 of the blade interchangeably with the rack unit 56, the unit 5| being adapted to make a buttonhole of keyhole shape. 7 a

In order to hold these rackunits in place, a lower cover 63 is provided, which cover is hinged to the base plate l0 at64 .(Figs. 1 and 2) and is provided at its free end with a spring latch 55 engaging the upper surface of-the base plate in to, hold it in place. Uponv the upper surface of this cover is a fiat spring 68 which bears against the rack unit 56 and holds it in place. i 3 Upon the upper end of the shaft 30 is secured aknob- Blby which this shaft may be turned so as to'advance the rack unit and the feed blade manually; if desired,-in--order to begin stitching at any desired place around the periphery of the buttonhole. a i

. In Figs. 9-and 100f the drawings,'I have shown amodifiedform of my invention-in that a different construction is employed to impart an intermittent feed-or rotation of the pinion 32. In this form of my invention the hub28 is somewhatsmaller than the -hub 28 shown in Fig. 3. About this' huba spring 68 is coiled, the lower end of-which spring is secured at 69 toa lug 10 on the-lower surface of the bridge member 33. It will be noted that, as shown in Fig. 9, the spring passes 'through a'n' elongated opening H in the lug 10,'and an adjusting screw "serves to hold the end of the-spring against movement so that the feed may be adjusted by turning this screw.- It will be obvious'that with this arrangement,- when the lever 23 is moved in one direction, the spring will be tightened about the hub 28 and cause this hub to rotate, thus rotating the shaft 35 and pinion 32, while, when the lever 23 is moved in the other direction, the spring will be relieved of its grip upon the hub and the pinion 32 will remain at rest.

The operation of my device is briefly as follows: When the lever i6 is oscillated by the reciprocation of the needle bar, the cam roll or wheel is will be givena step+bystep movement through the pawl 19 and ratchet wheel 2|. By the engagement-of the pin 3| and pinion 32' with the rack unit 56 which is held snugly in place in the feed blade 45, the oscillation of the lever 23 by the movement of the cam-wheel l3 will be imparted to the feed blade. This effects lateral oscillation of the forward end of the feed blade and, therefore, of the presser foot 48 and the goods carried thereby so as to move the material back and forth and effect the zig-zag stitching,

shown in Fig. 11,'this-movement moving the needle from points in the line a, for example, to pointsin the line b, and vice versa. Y At the same time, the pinion 32 will be caused to rotate, and by its engagement with the teeth of the endless rack of the rack 'unit 56 the feed blade will be caused to move slidably and in a longitudinal direction relatively to the frame of the attachment.- Due to the engagement of the pin 5| in the groove or track 58 this will cause the rear end of the feed blade to-travel in an oblong path and thus produce the closed line of stitchin shown in Fig.- 11. During this movement the feed" blade moves about the pivot pin 38 and also slides longitudinally with respect to this pin as permittedby the slot. i If it is desired to change the bite or the width of the stitching between the line a and the line I), this may bedone by moving the lever 36 which moves thepivot'point 38 and, therefore, changes the movement'of the front end of the feed blade with respect to the movement of the rear end by changing the application of the pivot point.

The length and the general shape of'the button hole is determined by the shape of the guide groove 58 and the rack teeth of the rack unit 56 so that,-it a shorter buttonhole is desired or one of keyhole shape, jadifferent rack unit isemployed which-"as already described, may be readily inserted in place. 7

If it is desired to vary the spacing of the stitching which is the distance between'the median line of the stitching at one side of the buttonhole and that at the other side, or the distance between the lines o and d in Fig. 11, this may be done also by movement of the lever 36 as movement of the pivot pin 38 notonly changes the lateral throw of the feed'blade in making the stitches, but also changes to a degree the lateral throw of the. feed blade at the end of the buttonhole when the pilot pin is passing over the oblong ends of the .endless track, so that two adjustments are eifected by the lever 36. It is understood that the spacing is also partly determinedby the 'distancebetween the opposite runs of: the track 58, but the determination in this respect is modified 'bythe position of the pivot pin 38. v

While I have shown and described some preferred embodimentsiof my invention, it. will? be understoodthat it isnot to be limited toall of the details shown, .but'is capableof modification and variation within the spirit of theinvention and within the scope of the claims; 5 *1 s What I claim is: H Y

1. A buttonhole attachment for sewing. maehines,"comprising a supporting plate, a lever pivotally mounted thereon, means for oscillating said leverina substantially horizontal plane, a feed blade, means connecting said blade to the plate for oscillatory and sliding movement, and .cooperating interengaging means mounted upon said lever and feed blade for actuating the latter in both oscillatory and-sliding movements by the oscillatory movement of the lever.

A buttonhole. attachment for sewing ma chines, comprising a supporting plate, a lever pivotally mounted thereon, means for oscillating said lever ina substantially horizontal plane, a feed blade, means connecting said blade to the plate for oscillatory and sliding movement, and cooperating means carried by said leverand feed blade for'actuating the latter in both oscillatory and sliding movements by the oscillatory movement of the lever, said-last-named means comprising a pinion carried by said lever.

3. A buttonhole attachment for sewing machines, comprising a supporting plate, a lever-pivotally' mounted thereon, means for oscillating said lever ina substantially horizontal plane, a feed blade',-'means connecting said blade to the plate for oscillatory and-sliding movement, cooperating means carried by said lever and feed blade for actuating the latter in both oscillatory and sliding'movements by the oscillatory movement of thelever, said last-named means comprising a pinion carried by said lever, and a rack on said blade with which said pinion is engaged.

'-"'4.=A buttonhole attachment for sewing machines, comprising a supporting plate, a lever pivotally mounted thereon, means for oscillating said lever in a substantially horizontal plane, a feed blade, means connecting said blade to the plate for oscillatory and sliding movement, cooperating means carried by said lever and feed blade f or'actuating the latter in both oscillatory and sliding movements by the oscillatory movement of the lever, said last-named'means comprising a pinion carriedby said lever, and means for effecting rotation of said pinion by the oscillatory movementof the' lever.

5.'-A;--'buttonhole attachment for sewing machinesfcomprising' a supporting plate, a lever pivotallymounted thereon, means for oscillating 'saidlevei in' a substantially horizontal plane, a feed blade, means connecting said blade to the plate for oscillatory and slidingmovement, coop pivotally mounted thereon, means for oscillating said lever in a substantially horizontal plane, a feed blade, means connecting said blade to the plate for oscillatory and sliding movement, coopcrating means carried by saidlever and feed blade for actuating the latter in both oscillatory and sliding movements by the: oscillatory movement of the lever, said last-named means. comprising a pinion carried by said lever, and a rack .on. said blade with which said pinion is engaged. said rack being rigidly secured to the blade .whereby said blade is moved in one direction upon. rotation of the pinion and in a transverse direction by oscillation of said'lever.

'7. In a buttonhole attachment for sewing m'achines having a needle bar, a supporting frame, a feed blade carried'by the frame for pivotal and sliding movements relatively thereto, a rack member fixedly secured to said blade, a pinion engaged with the teeth of said rack member, means carried by the frame for supporting said pinion for rotating movement and for oscillat ing movement about a point remote from its axis, and means for simultaneously rotating said pinion and oscillating it about said point.

8. In a buttonhole attachment for sewing ma.- chines having a needle bar, a supportingframe, a feed blade carried by the frame for pivotal and sliding movements, relatively thereto, a rack member fixedly secured to said blade, a lever pivoted to the frame and oscillated by the movement of the needle. bar, a pinion rotatably carried'by the lever and engaged with said rack member, and means for. effecting intermittent rotation of the pinion upon oscillation of the lever.

9. A buttonhole attachment for sewing machines, comprising a supportingplate, a lever pivotally mounted thereon,,means for oscillat ing said lever in a substantially horizontal plane,

a feed blade, means connecting said blade to the plate for oscillatory and sliding movement, cooperating means carried by said. leverand feed blade for actuating'the latter'in" both oscillatory and sliding movements by the oscillatory movement of the lever, said last-named means comprising a pinion carried by said lever, means for effecting rotation of said pinion by the oscillatory movement of the lever, and means for rotatin said pinion independently of the movement of the lever.

10. In a buttonhole attachment for-sewing machines having a needle bar, a supporting frame, a feed blade carried by the frame for pivotal and sliding movements relatively thereto, a rack member fixedly secured to said blade, a pinion engaged with-the teeth of said rack, means supporting said pinion on the frame for rotation about its axis and for oscillation'about a point remote from its axis, and means .for simultaneously rotating'said pinion and oscillating. it about said point, said rack memberv being removably secured to the blade whereby it maybe replaced by another.

11. In abuttonhole attachment for'sewing machines having a needle bar,,;a supporting frame, a feed blade carried by the frame for. pivotal and sliding movements relatively thereto, a rack member fixedly secured to said blade, ,a, pinion engaged with the teeth of said rack member, means carried by the frame for supporting said pinion for rotating; movement-and foroscillating movement about a point remote from its axis, and means for simultaneously rotating said pinion and oscillating it about saidv point, said blade having an opening therein, and said rack member being snugly and removably received in said opening.

7 12.- In a buttonholeattachment for sewing machines having a needle bar, a supporting frame, a feed blade carried by the frame for pivotal and sliding movements relatively thereto, said feed blade being provided with an opening. for selectively receiving one of a plurality of rack mem-' bers, a rack member rem'ovably disposed in said opening, a pinionengaged with. the teeth of said rack member means carried by the frame for supporting said pinion for rotating movement and for oscillating movement about a point remote from its axis, and means for simultaneously rotating said pinion-on its axis and oscillating it about said point. I

13. In a buttonhole attachment for sewing machines having a-needle bar, a supporting frame, a feed blade carried by the frame for pivotal and sliding movements relatively thereto, a rack member fixedly secured to said blade, a pinion engaged with theteeth of said rack member, means carried by the frame for supporting said pinion for rotating, movement and for oscillating movement about a point remote from its axis, means for simultaneously rotating said pinion and oscillating it about said point, said rack member having an endless series of teeth thereupon to move said feed blade in an oblong path to stitch around a buttonhole, and means for adjusting the bite of the stitch.

14. In a buttonhole attachment for sewing machines having a needle bar, a supporting frame, a feed blade carried by the frame for pivotal and sliding movements relatively thereto, a rack member fixedly secured to saidblade, a pinion engaged with the teeth of said rack member, means carried by theframe for supporting said pinion for rotating movement and for oscillating movement about. apoint remote from its axis, means for simultaneously rotating, said pinion and oscillating it about said point, said rack. member having an endless series of teeth thereupon to move said feed blade inan oblon path to stitch around a buttonhole, and means for adjusting the spacing of the stitching on one side of the buttonhole from that on the other side.

15. In a buttonhole attachment for sewing machines having a needle bar, a supporting frame, a feed blade carried by the frame for pivotal and sliding movements relatively thereto, a rack member fixedlysecured to said blade, a pinion engaged with the teeth of said'rack member, means carried by the frame for supporting said pinion for rotating movement and for oscillating movement about apoint remote from its axis, means for simultaneously rotating said pinion and oscillating'it about said. point, said rack member havin an'endless series of teeth thereupon to move said feed blade in an oblong path to stitch around a buttonhole,-and means for adjusting the position of the pivotal connection of the feed blade with the frameto adjust both thebite and spacing of the stitching.

16. A buttonhole attachment for sewing machines, comprising a supporting plate, a lever pivotally mounted thereon, means for oscillating said lever in a substantially horizontal plane, a feed blade, means connecting said blade to the plate for oscillatory and sliding movement, cooperating means carried by said lever and feed blade for actuating the latter in both oscillatory and sliding movements by the oscillatory movement of the lever, said means including a rack member, said feed blade having an opening therein, and said rack member being snugly received in said opening, and means to removably hold said rack member in place.

17. A buttonhole attachment for sewing machines, comprising a supporting plate, a lever pivotally mounted thereon, means for oscillating said lever in a substantially horizontal plane, a feed blade, means connecting said blade to the plate for oscillatory and sliding movement, cooperating means carried by said lever and feed blade for actuating the latter in both oscillatory and sliding movements by the oscillatory movement of the lever, said last-named means comprising a pinion carried by said lever, means for effecting rotation of said pinion by the oscillatory movement of the lever, said means comprising a ratchet wheel 011' shaft,

and a cooperating pawl mounted on the plate.

18. A buttonhole attachment for sewing machines, comprising a supporting plate, a lever pivotally mounted thereon,'means for oscillat for effecting rotation of said pinion by the oscillatory movement of the lever, said means comprising a spring coiled about the shaft of said pinion and having one end fixed with respect to the plate.

NILS T. ALMQUIST.

REFERENCES CITED The following references are of record in the flleof this patent:

UNITED STATES PATENTS Name Daite Harris Dec. 7, 1880 Number

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US235235 *Mar 8, 1880Dec 7, 1880 Button-hole attachment for sewing-machines
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2619925 *Jan 18, 1951Dec 2, 1952SharenowButtonhole attachment
US2645191 *Oct 24, 1951Jul 14, 1953Greist Mfg CoAttachable feeding foot for sewing machine attachments
US2649063 *Oct 27, 1950Aug 18, 1953Greist Mfg CoButtonhole attachment for sewing machines
US2676558 *Dec 22, 1950Apr 27, 1954Singer Mfg CoOrnamental stitching attachment for sewing machines
US2700948 *Jul 26, 1952Feb 1, 1955Greist Mfg CoButtonhole attachment
US2717565 *Jun 19, 1952Sep 13, 1955Greist Mfg CoButtonhole attachments
US2735387 *Jun 27, 1952Feb 21, 1956 Button-sewing attachments
US2804035 *Jan 25, 1956Aug 27, 1957Greist Mfg CoButtonhole attachments
US3782307 *Nov 4, 1968Jan 1, 1974Janome Sewing Machine Co LtdButton hole attachment for zigzag sewing machines
Classifications
U.S. Classification112/77, D15/72
International ClassificationD05B3/24, D05B3/00
Cooperative ClassificationD10B2501/062, D05B3/24
European ClassificationD05B3/24