US2952228A

US2952228A - Decorative stitch attachments

Info

Publication number: US2952228A
Application number: US599272A
Authority: US
Inventors: Carl G Baehr; Curello Charles
Original assignee: Greist Manufacturing Co
Current assignee: Greist Manufacturing Co
Priority date: 1956-07-20
Filing date: 1956-07-20
Publication date: 1960-09-13
Anticipated expiration: 1977-09-13

Description

Sept. 13, 1960 G. BAEHR ET AL 2,952,228

DECORATIVE STITCH ATTACHMENTS Filed July 2o, 1956 4 Sheets-Sheet l zza Iza l /20/07 ua INVENTORS ATTORNEYS Sept. 13, 1960 c. G. BAEHR en -Ax. DECORATIVE STITCH ATTAcHMENTs 4 Sheets-Sheet 2 Filed July 20, 1956 QJ ZM.. ao 4 O 5 3G \l Fo I 5 4 5 6 77 oo fm d A .M "l 8 ,MW ww n .1.. AIO IW 7. -j 5e ww l o U .IIZ m l Ilm# ..../4 7 3 .QM

ISI/g5 gun/f 6;. INVENTORS @y j-M M ATTORNEYS Sept. 13, 1960 c. G. BAEHR ETAL 2,952,228

DECORATIVE STITCH ATTACHMENTS Filed July zo, 195e 4 sheets-sheet :s

INVENTORS oRNEYa Sept. 13, 1960 c. G. BAEHR ETAL DECORATIVE STITCH ATTACHMENTS 4 Sheets-Sheet 4 Filed July 20, 1956 5 q e4 44 3,2/0 4/ 73;)3 M108 i INVENTORS L ATTORNEYS,

nfed States Patent 0153@ Patented sept. 13, 1960 2,952,228 DECORATIVE STITCH ATTACHIVIENTS Carl G. Baehr, West Haven,

Haven, Conn., assignors to The Greist Manufacturing Company, New Haven, Conn., a corporation ol? Connecticut Filed July 20, 1956, Ser. No. 599,272 Claims. (Cl. 112--160) This invention relates to sewing machine attachments and more particularly to an attachment adapted to be applied to the ordinary household sewing machine and arranged to effect decorative stitching in any one of a number of patterns. Devices of this character have usually comprised a frame portion which may be secured to the presser bar of a sewing machine, the frame having pivoted thereto a lever on which the presser foot is car-l ried, this lever being mounted for transverse or zigzag movements so as to move the cloth laterally with respect to the sewing machine needle in addition to the longitudinal movement effected by theusual feed mechanism. The lever which carries the presser foot is ordinarily actuated by a rotatable cam member actuated in a step-bystep movement by means of a fork arm attached to the needle bar of the sewing machine, the cam member usually having a cam track in which is engaged a pin or follower attached to the lever.

It is desirable to provide an attachment whicllsmay produce a variety of different sewing patterns, and in the past this has sometimes been accomplished by providing a plurality of cam members or -by providing a single cam member and some means for varying the movement of the cam by the fork arm. In such devices it is usually necessary, in order to elect a change in the pattern of stitches, to disassemble at least a part of the device and substitute a different cam or different means for actuating the cam for the one which has been previously employed. These operations are not as simple as could be desired, and it is sometimes diicult to set the attachment for the pattern which is desired without experiment.

It is contemplated by the present invention to provide an attachment for sewing machines wherein the stitch pattern may be varied merely by an adjustment of the mechanism built into the attachment so that it is unnecessary to remove and replace any of the parts. With such an arrangement a number of separate parts do not have to be provided and, as such separate parts are apt to -be lost, it is desirable that all of the mechanism be permanently incorporated in the attachment itself. Also by a simple movement or change in the position of an adjusting member or control member the pattern of the stitching effected by the device may be varied and thus the attachment is more easily manipulated than those in use at the present time.

Moreover provision is made for a considerable variation in the patterns of decorative stitching which may be eected by the attachment. For example, plain zigzag stitching may be effected where a transverse movement of the presser foot is accomplishedv upon each reciprocation of the needle bar. This, however, can be varied so that zigzag movements are effected every other stitch or every third stitch, or in any desired sequence.

v In addition it is sometimes desirable that the number of stitches between each transverse movement is not uniform and also that the machine may stitchY through the goods a plurality of times during the transversemovement and Charles Curello, East from one extreme to the other so that intermediate stitches may be elected during a complete movement of the presser foot from its extreme lateral position on one side to the extreme lateral position at the other side of the path of the needle. All of these varieties of stitches may be elfected by the present attachment.

One object of the present invention is to provide a new and improved decorative stitch mechanism -for sewing machines in the form of an attachment which may readily be employed with the ordinary domestic household sewing machine.

A further object of the invention is to provide a new and improved decorative stitch mechanism for sewing machines wherein the stitch pattern may be readily and easily varied by mechanism which is a permanent part of the attachment.

Still another object of the invention is to provide a decorative stitch attachment of the character described having a plurality of cams to control the oscillation of the presser foot of the attachment, the arrangement being such that any one of a desired number of cams may be brought into position to control the lever upon which the presser foot is mounted.

Still another object of the invention is to provide a decorative stitch attachment of the character described wherein a number of controlling cams are arranged in a bank upon the device and a follower is provided which may be movable along the bank of cams into operative relation with any selected one of the cams, this follower being operatively connected with a pivoted lever upon which the presser Ifoot of the attachment is carried so thata desired stitch pattern will be effected.

To vthese and other ends the invention consists in the novel `features and combinations of parts to -be hereinafter described and claimed.

In the accompanying drawings: f Fig. 1 is a side elevational view of a decorative stitc attachment embodying our invention with the cover removed to show the interior mechanism;

Fig. 2 s a similar view of the other side of the device with some parts broken away;

Fig. 3 is a top plan View of the structure;

Fig. 4 is a bottom plan viewv of the device;

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

Fig. 6 is an elevational view of the rear part of the attachment similar to Fig. l but showing the cam follower in another position;

Fig. 7 is a sectional view on line 7-7 of Fig. 1;

Fig. 8 is a transverse sectional View on line 8 8 of Fig. l;

Fig. 9 is a top plan view of the actuating slide;

` Fig. 10 isv a perspective view of the U-shaped frame member which carries the cam follower;

, Fig. l1 is a side elevational View of the cover; and

Fig. l2 is a perspective view of one of the actuating levers Vof the cam follower. f

To illustrate a preferred embodiment of the invention there is shown in the drawings an attachment comprising a frame member 10 having a forwardly extending portion 11, the sides of which are bent upwardly to crank 17 having a crank arm 18 to be referred to herein-- after, the arrangement being such that reciprocation ofl Y 3 needle bar will effect oscillatory movement of the crank arm 18.

The presser foot is indicated at 20, the foot being carriedv at the forward end of a lever 21 which, as shown more especially in Fig. 5, is provided with a slot 22 in which is slidably received a pin 23, this pin being also slidable in a slot 24 in the forwardly extending arm 11 of the frame. The pin 23 is carried by an adjusting plate 25 (Figs. 4 and 5), which plate is adjustably mounted on the lower side of the frame, and for this purpose the plate is provided with an arm 26 (Fig. 2) adapted to receive a screw 27 slidable in a slot 28 on a ange 29 of the frame member 10. With this arrangement, when the screw 27 is loosened, the adjusting plate 25 may be moved to and fro with respect to the frame to adjust. the position of the pin 23 and, therefore, adjust the throw of the presser foot. The screw 27 is threaded into a block 38 on the side of the flange 29 which is opposite that of the arm 26.

Slidably mounted upon the upper surface of the frame member 18 is an actuating slide 32 (Figs. 7 and 9). This slide is provided with an elongated opening 33 which receives screws 34 secured to the frame plate 10 and is also provided with another guide slot 35 to receive a pin 36 secured to the frame plate. In this manner the slide is operatively connected to the plate for sliding movement thereon. Adjacent its forward end the slide 32 is provided with an upstanding bifurcated flange 37 having an open-ended slot 38 between the forks thereof in which slot is received the crank member 18 of the crank 17 previously described so that reciprocation of the fork arm 16 effects reciprocation of the slide 32.

Upon this slide is pivotally mounted at 40 a pawl 4l, the forward hooked end 42 of which is urged by a spring 43 into engagement with the teeth of a ratchet wheel 44 (Fig. 7) rotatably mounted on the attachment as will be hereinafter explained. This spring has a downwardly turned end 43@L which normally engages over the back of the pawl 41.

Also pivotally mounted at 45 on the plate 32 is a lever 46 having a nose portion 47 bearing against the tail 48 of the pawl 41 so as to, when desired, swing the pawl about its pivot into position where it no longer engages the ratchet wheel 44. The lever 46 may be provided with a detent 49 (Fig. 7) adapted to engage in openings 50 in the slide 32 to hold it in position to which it is moved. When the pawl is moved to disengaging position, straight sewing is effected by the attachment.

Pivotally mounted upon the frame plate at 52 is a substantially U-shaped auxiliary frame member comprising an upright portion 53, a horizontally extending portion 53@ adjacent the base plate 10, and a second horizontally extending portion 54 spaced upwardly from the base plate. A screw 54a secured to the portion 53a is slidably received in an arcuate slot 5419 (Fig. 7) in the base plate to guide this member in its movements. Secured in this member are posts -55 and 56, and upon each of these posts are rotatably mounted a plurality of

cams

57 and 58, the cams of one bank being held together by screws 59 and those of the other bank by screws 60 so that the camsk of each bank will rotate in unison.

Also rotatably mounted on the post 56 is the hub 61 of the ratchet Wheel 44, and a pin 63 disposed in registering openings in the bank of cams 58 extends downwardly into this ratchet wheel and connects it nonrotatably to the bank of cams. extends through a gear 64 mounted on the hub 61 of the ratchet wheel so that the bank of cams, gear and ratchet wheel are locked together.

Similarly a gear 65 is mounted on a hub 66 embracing the post 55, and this gear is secured to the bank of cams 57 by screws 59 and a driving pin 67 which extends downwardly through the cams into the gear. A pinion 68 is rotatably mounted upon a shaft 69- adjacent the lower portion of the U-shaped frame member and the This pin as Well as the screws 60 alsoV teeth of this pinion mesh with those of the

gears

64 and 65, as shown in Fig. 7. With this construction it will be seen that as the slide 32 is reciprocated the pawl 41 will rotate the ratch wheel 44 in a step-by-step movement and rotation of this` ratchet wheel will in turn eect rotation of the gear 64, the pinon 68 and gear 65, resulting in the rotation of both banks of

cams

57 and 58.

The shaft 69 extends upwardly through the frame member 54 so that the pinion 68 may be rotated by hand, if desired, and for this purpose a t-urn button 78 is threadedly connected to the shaft 69 at 71.

As stated, the U-shaped frame member carrying the bank of cams is pivotally secured to the frame plate 10 so that it may be rocked about its pivot so that the cams may be disengaged from the cam follower hereinafter described. This frame may be locked in place by means of a vertical lever 72 pivoted to the frame member 53 at 73 (Fig. 8) and rotated about this pivot by a manually manipulatable arm 74 which is secured to the lever 72. As shown in Figs. 2 and 8, the lower end of this lever is adapated to be engaged in a slot 7'5 in the frame plate 10 and the upper end of the lever engaged in a slot 76 in the arm 77 of a U-shaped member having a vertically extending portion 78 and a horizontally extending portion 78g4 secured to the base plate by screws, one of which is shown at 78". This member also has a portion 79 spaced upwardly from` the base plate. A spring 80` secured at one end to an arm 81 on the lever 72 and at the other end to a post 82 (Fig. 7) on the vertical portion 53 of the U-shaped frame which carries the cams, normally holds the lever 72 in its` locking position. The arm 81 extends inwardly through an arcuate slot 83 in the member 53.

As will K.be understood, when it is desired to move the bank of cams `about the pivotal connection 52 of the U-shaped frame, the lever 72 may be swung in a counterclockwise direction, as shown in Fig. 2, aga-inst the tension of the spring 88 so as to dsengage the ends of the lever from the slots: 75 'and 76. When the cam-carrying `frame is swung to this inoperative position, as shown in dotted lines in Fig. 3, the lower end of the lever 72 will Iride .upon a solid portion of the plate 18 so that when the frame is moved back to its full-line position shown in this figure the spring 801 will cause the lever to snap automatically into p-lace.

The exact operative position of lthe U-shaped camcarrying frame may be determined by a stop screw 85 eccentrically mounted in the horizontal portion 54 of this lframe (Fig. 3) which screw engages against a shoulder 86 on a part of -the frame member 77 The manner of rotating the cams from the reciprocation of the needle bar has been described above and descripftion will now be given of the manner of controlling the pivotal movements of the presser yfoot lever 2l by the rotation of the pairs of cooperating cams, one upon each ibank. It may here be noted that the

cams

57 and 58 are :arranged in horizontally aligned pairs and these cams are complemental to each other so that a follower member to be hereinafter described will be held in engagement with one of lthe ca -ms by the operation of the cooperating cam, as shown, for example, in Fig. 7, from which it will be seen that a protuberance on one cam lies upon a depression or concavity upon the periphery of a cooperating cam upon the -other bank so that each end of a pivoted follower to be hereinafter described will always be held in engagement with its cooperating cam.

The presser Ifoot ylever extends rearwardly, as shown more especially in Fig. 5, and is provided with an offset portion 87 extending over the frame plate 10. To this end `of the presser foot lever is pivoted at 88 -a link 89 (Fig. 7), the other end of which is pivoted to a vertically disposed rod 90 secured in arms 91l and 92 of a U-shaped rocker member 93. This rocker member is rocka'bly mounted by means of

openings

94 and 95 upon a shaft 96 secured in the frame members 77 and 79 (Fig. 8). Rockaccesos IJ in'g or oscillation of the member 93 will by means of the link 89 effect lateral movements of the rear end of the presser foot lever 21 'and rock this lever about its pivot 23 on the frame.

Slid-ably and rockably mounted upon the shaft 96 is a cam follower 97, this member being carried by a hub 98 (Fig. 8). T'he cam follower, as shown in Fig. 7, comprises an elongated body portion 99 having follower porftions 100 and 101 :at its ends, the follower 100 being adapted to engage one of the cams 57 while the follower '1 is adapted to engage a selected one of the cams 58. The follower is lalso provided with an ear 102 which embraces the rod or shaft 90 on the rocker 93 so that rocking of the follower member about the shaft 96 by its engagement with the

cams

57 and 58 will effec-t oscillation of the rocker 93 to which the rod 90 is secured.

It will, of course, be understood tha-t in general each of the cams 57 will have a different peripheral configuration as will also each of the cams 58, and in order to change from one stitch pattern to 'another it will be necessary to bring the follower member 97 into cooperative relation with `different ones of the pairs of cams in the two banks. To this end the hub 98 is provided with a groove 105 into which extend the bifurcated end members of ya slide 106 (Fig. 8), this slide being slidably mounted on the frame member 78 by means of a pin 107 threadedly secured to the slide 106 and having a body portion 108 received in a slot 109 in the member 78. The pin 107 has an enlarged head 110 and a spring 111 is mounted between this lhead and the member 78 at the edges of the slot 109. An end portion 112 of this spring extends into the slot 109 to assist in guiding the slide 106 in its movements.

As shown more especially in Figs. 7, 8 and l2, the inner end of the pin 107 is engaged by the fork 113 of ya lever 114 (Fig. l2) pivoted to a part ofthe frame mem-ber 78 at 115. This lever is provided at its rear end'with a Ilug 116 which is received in the bifurca-ted end 117 of :an adjusting lever 118 also pivoted to a portion of the lframe 78 at 115.

With this construction it will be seen that -as the lever 118 is -swung about its pivot 115, the actuating lever 114 will likewise be moved about the :same pivot and on account of the engagement of the forked end 113 of the latter lever with the pin 107, fthe slide 106 and, therefore, the cam follower will be moved upon the shaft 9610 effect its engagement with `any selected pair of the coopera-ting cams.

In order to hold the lever 118 in a predetermined position to which it may be moved, this lever is provided with an offset portion 120 (Fig. 7), land extending through slots 121 in this portion of the lever is a slide '122 which is urged toward the rear end of the lever by lthe spring 123, one end of this spring being connected to a pin 124 on the slide and the other end to Ia pin 12S 0n the lever. The forward end of this slide is of U-shaped form, as shown at 126, to embrace an edge of the frame member 78 and is provided with a detent 127 adapted to cooperate with the teeth of a toothed segment 1-28 (Figs. 1 and 3) provided on the portion 78 of the frame. rl`he segment 128 is of -arcuate form, the arc of which is described about [the pivot 115. The slide is provided with a

finger piece

1,29, and it will be seen Ithat by drawing this finger piece to the left, as shown in Figs. l, -3 and 7, the detent 127 will be freed from the toothed segment 128 so that the lever '118 may be moved to any desired position. Upon release of the linger piece the detent will again engage the toothed segment `and hold the lever and, therefore, the follower in the predetermined -selected position to effect the desired stitch pattern.

A T-shaped reinforcing member 130 may be secured to the frame 10, as shown in Figs. 5 and 7, the body portion of this member extending over the rear portion 87 of the presser foot lever 21 and an elongated slot 131 is provided in this member through which the pivot pin 88 extends, Ithis slot permitting movement of the pivot pin during oscillation of the presser foot. The forwardly extending arm 132 of the member 130 -is secured to the forward extending arm 11 of the frame.

A cover may be provided for the device, .as shown at 134 in Fig. 11. This cover may be secured to the frame in any desired manner and, as shown, is provided with an arcuate slot 135 through which the nger piece 129 extends, the slot being of sufficient width -to allow movement of the ringer piece from ful-lto dotted-line position, shown in Fig. 7. Adjacent this slot indicia 136 may be provided to indicate the particular pair of cams with lwhich the follower is in engagement upon yany given position of the lever 118.

From the above it will be apparent that the follower portions 100 and r101 of the cam follower may by movement of the latter along the shaft 96 be placed in engagement with any selected pair of

cams

57 and 58 to produce the desired decorative stitch pattern. When the sewing machine is then operated, the fork arm 16 will be reiprocated by the needle bar and effect reciprocation of the slide 32. The pawl 41 by engagement with the ratchet wheel 44 effects rotation of both banks of cams which in turn serves to rock the cam follower about its pivot 96. As the cam follower is connected to the rod of the rocker member 93, oscillation of the follower will effect rocking movement of this rocker member about the shaft 96. As the link 89 is connected to the -rod 90, movement of the rocker member will effect oscillation of the presser foot 21. The oscillations of the presser foot are, therefore, controlled by the cams so that the configuration of the latter will determine the particular stitch pattern produced by the attachment.

l While we have shown and described one embodiment of our invention, it will be understood that it is not to be limited to all of the details shown, but is capable of modification and variation within the spirit of the inventionY and within the scope of the claims.

What we claim is:

l. A decorative stitch attachment for `sewing machines comprising a main frame, a presser foot lever pivotally mounted on the frame, means for oscillating said lever comprising a cam follower rockably mounted on the frame and operatively connected to said lever, an auxiliary frame pivotally connected to said main frame, and a' bank of cams rotatably mounted on said auxiliary frame for selective engagement by said follower, and means for releasably holding said auxiliary frame in position on Said main frame comprising a spring-urged latching member pivotally mounted on the auxiliary frame for movement to positions to engage and disengage a part of the main frame.

2. A decorative stitch attachment for sewing machines comprising a main frame, a presser foot lever pivotally mounted on the frame, means for oscillating said lever comprising a cam follower rockably mounted on the frame land operatively connected to said lever, an auxiliary frame pivotally connected to said main frame, and a bank of cams rotatably mounted on said auxiliary frame for'selective engagement by'said follower, means for releasably holding said auxiliary frame in position on said mai-n frame comprising a latching member pivo'ted between its ends on the auxiliary frame, and means on the main frame engages.

3. A decorative stitch attachmentfor sewing machines comprising a main frame, a presser foot lever pivotally mounted on the iframe, means for oscillating 'said lever comprising a cam follower rockably mounted on the frame and operatively connected to said lever, an auxaliary frame pivotally connected to said main frame, and a bank of cams rotatably mounted on said auxiliary frame for selective engagement by said follower, means for releasably holding said auxiliary frame in position on said main frame comprising a latching member pivwith which each end of said memberotally mounted on the auxiliary frame for movement to latching and unlatching position, said main frame having a slot in which `an end of said member engages, and spring means urging said member to latching position.

4. A decorative stitch attachment for sewing machines comprising a main frame, a presser foot lever pivotally mounted on the frame, means for oscillating said lever comprising a cam follower rockably mounted on the frame and operatively connected to said lever, an auxiliary frame pivotally connected to said main frame, and a bank of cams rotatably mounted on said auxiliary frame for selective engagement by said follower, means for releasably holding said auxiliary frame in position on said main frame comprising a latching member pivotally mounted on` the auxiliary frame for movement to eng-age and disengage a part of the main frame, and a stop member adjustably mounted on one of said frames against which a part of the other frame engages to locate the auxiliary frame.

5. A decorative stitch attachment for sewing machines comprising a main frame, a presser foot lever pivotally mounted on the frame, means for oscillating said lever comprising a cam follower rockably mounted on the frame and operatively connected to said lever, an auxiliary frame pivotally connected to said main frame, and a bank of cams rotatably mounted on said auxiliary frame for selective engagement by said follower, means for releasably holding said auxiliary frame in position on said main frame comprising a latching member pivotally mounted on the auxiliary frame for movement to latching and unlatching position and adapted to engage a part of the main frame, and a stop member adjustably mounted on one of said frames against which a part of the other yframe engages to locate the auxiliary frame, said stop member comprising a screw eccentrically threaded into said one frame.

6. A decorative stitch attachment for se-wing machines comprising a main frame, a presser foot lever pivotally mounted on the frame, means for oscillating said lever comprising a cam follower rockably mounted on the frame and operatively connected to said lever, an auxiliary frame pivotally connected to said main frame, a bank of cams rotatably mounted on said auxiliary frame, and means movably mounting said earn follower on the main frame `for sliding movement in a direction axially of said cams to engage a selected one thereof, and means to move said follower comprising a slide on the main frame engaged with the follower, and a manually operated lever connected to the Slide to move the latter.

7. A decorative stitch attachment for sewing machines comprising a main frame, a. presser foot lever pivotally mounted on the frame, means for oscillating said lever comprising a cam follower rockably mounted on the frame and operatively connected to said lever, lan auxiliary frame pivotally connected to said main frame, a bank of cams rotatably mountedv on said auxiliary frame, and means movably mounting said cam follower on the main frame for sliding movement in a direction axially of said cams to engage a selected one thereof, means to move said follower comprising a slide on the main frame engaged with the follower, -a manually operated lever pivoted on the frame vand connected to said slide to move the same, and interengaging means on the frame and lever to hold the latter in position to which it is moved.

8. A ldecorative stitch attachment for sewing machines comprising a main frame, a presser fcotlever pivotally mounted on the frame, means for oscillating said lever comprising a cam follower rockably mounted on the frame and operatively connected to said lever, ary frame pivotally connected to said main lframe, a bank of cams rotatably mounted on said auxiliary frame, and means movably mounting said cam follower on the main frame for sliding movement in a direction axially of said cams to engage a selected one thereof, and means to move said follower comprising a slide on the main frame engaged with the follower, a first lever pivoted on the frame and engaged with said slide, a second lever pivoted on the frame and engaged with said first lever, manually engageable means on said second lever by which the same may be moved, and interengaging means on the frame and said second lever to hold the latter in position to which it is moved.

9. A decorative stitch attachment for sewing machines comprising a main frame, `a presser foot lever pivotally mounted on the frame, means for oscillating said lever comprising a cam follower rockably mounted on the frame and operatively connected to said lever, an auxiliary frame pivotally connected to said main frame, a bank of cams rotatably mounted on said auxiliary frame, and means movably mounting said cam follower on the main frame for sliding movement in a direction axially of said cams to engage a selected one thereof, means to move said follower comprising a slide on the main frame engaged with the follower, a first lever pivoted on the frame and engaged with said slide, a second lever pivoted on the frame on an axis coincident with that of the rst lever and engaged with said first lever, manually engageable means on said second lever by which the same may be moved, and interengaging means on said frame and second lever to hold the latter in position to which it is moved.

10. A decorative stitch attachment for sewing machines comprising a main frame, `a presser foot lever pivotally mounted on the frame, means for oscillating said lever comprising a cam follower rockably mounted on the frame and operatively connected to said lever, an auxiliary frame pivotally connected to said main frame, a bank of cams rotatably mounted on said auxiliary frame, and means movably mounting said cam follower on the main frame for sliding movement in a direction axially of said cams to engage a selected one thereof, means to move said follower comprising a slide on the main frame en-y gaged with the follower, a first lever pivoted on the frame and engaged with said slide, a second` lever pivoted on the frame on `an axis coincident with that of the rst lever and engaged with said first lever, manually engageable means on said second lever by whichthe same may be moved, and interengaging means on said frame land second lever to hold the latter in position to which it is moved, said last-named means comprising `a spring-urged slide on the second lever having a detent thereon and ai toothed segment on said frame with which said detent is 'f engaged'.

References Cited in the file of this patent g UNITED STATES PATENTS an auxili-V