US2300104A - Folding treadle for sewing machines - Google Patents

Description

Oct. 27, 1942. E. COLEGROVE 2,300,194

' gonnme TREADLE FOR SEWING MACHINES Filed Feb. 6, 1940 2 Sheets-Sheet 2 4 INVENTOR.

BY Mime/W42 5 (0:56am! Patented Oct. 27, 1942 FOLDING TREADLE FOR SEWING MACHINES Nathaniel E. Colegrove, Cleveland, Ohio, assignor to White Sewing Machine Corporation, Cleveland, Ohio, a. corporation of Delaware Application February 6, 1940, Serial No. 317,579

14 Claims.

This invention relates to sewing machines and more particularly to sewing machines of the treadle operated type.

An object of the invention is to provide a treadle operated sewing machine and cabinet therefor, wherein the main driving wheel which drives the pulley of the sewing machine head is always concealed within a compartment formed in the cabinet, while the rockable treadle which actuates said wheel is operatively connected thereto in such manner that when not in use it can be swung from its horizontal operative position outside of said compartment into a substantially vertical concealed non-operative position within said compartment.

Another object is to provide a treadle operated sewing machine and cabinet therefor such as specified in the first named object and wherein the treadle may be swung from its operative position without the compartment to its inoperative substantially vertical concealed position within the compartment of the cabinet without disturbing the operative connection between it and the actuating mechanism for the driving wheel and independently of any movement of any of the parts of said mechanism and without requiring a complicated or unusual operative connection between the pitman of said mechanism and the part that actuates said pitman.

A further object of the invention is to provide a treadle operated sewing machine and cabinet therefor such as specified in the above named objects and wherein the actuating mechanism for the sewing machine is in the form of a unit assembly mounted within a compartment formed in the cabinet and to which unit assembly the treadle is pivotally connected, such that the pivotal movement of the treadle from its substantially vertical inoperative position within the compartment to its horizontal operative position outside of the compartment or Y vice versa does not affect the relationship of the ment and of the cabinet itself can be held to a minimum and in proper proportion to the width of the cabinet, thus providing a cabinet of pleasing appearance as well as one which supports the sewing machine head at the correct operative height.

Further and additional objects and advantages not hereinbefore specified will become apparent hereinafter during the detailed descrip-' tion which is to follow of an embodiment of the invention.

Referring to the accompanying drawings illustrating said embodiment of the invention,

Fig. 1 is a front elevational view of a sewing machine cabinet of the kneehole desk type, with certain portions of the cabinet broken away and shown in section in order to disclose the interior of the compartment and show in full lines the actuating mechanism unit assembly mounted therein, the treadle being shown in section, in the horizontal operative position extending across the knee or operating opening of the cabinet and by dash and dot lines when in the inoperative substantially vertical position within the compartment of the cabinet.

Fig. 2 is a horizontal sectional view taken substantially on line 22 of Fig. 1, looking in the direction of the arrows.

Fig. 3 is a vertical transverse section taken substantially on line 3--3 of Fig. 1, looking in the direction of the arrows, with the door of the compartment open and the treadle in the operative position.

Fig. 4 is a fragmentary detail sectional view on a larger scale than Fig. 2 and is taken on line 4-4 of Fig. 2, looking in the direction of the arrows.

Fig. 5 is a fragmentary detail sectional view on a larger scale than Fig. 2 and is taken sub stantially on line 5-5 of Fig.2, looking in the direction of the arrows.

Fig. 6 is a fragmentary detail elevational view on a larger scale than Fig. 1 and is taken from the line 66 of Fig. 1, looking in the direction of the arrows, and

Fig. 7 is a fragmentary sectional and elevational view on a larger scale than Fig. 1 and shows the arrangement for supporting the free or left-hand end of the treadle shaft when the treadle is in its operative horizontal position in the kneehcle or operating space of the cabinet.

The sewing machine cabinet illustrated herein is of the kneehole desk type and comprises a housing chamber [0 for the sewing machine head. The upper or top side of the housing chamber it is provided with a work table ii that has an opening therein in which the sewing machine head is pivotally mounted so that it can be dropped into an inoperative position in the housing chamber or can be swung upward- 1y therefrom into an operative position on the work table ii.

The opposite ends of the work table ll have pivotally connected thereto swinging top leaves 52 and i3, which leaves when in the position shown in Fig. 1 cover the opening in the work table H and have their adjacent edges interfitting but when swung from said position to their open position form continuations of the work table H. in their open position the sewing machine head can be moved from its inoperative position within the housing chamber to its operative position on the work table ll. Inasmuch as the sewing machine head itself and the manner in which it is mounted on the cabinet for movement into and out of the housing chamber iii form no part of the present invention and are well under stood. in the art, said sewing machine head and its mounting have not been illustrated herein.

- The housing chamber iii and work table it of the cabinet are supported by the four corner posts Hi and the posts at each end of the cabinet are interconnected by end panels 55 and 16. Connected to the front and rear posts M at the right-hand side of the cabinet, as viewed in the drawings, are front and rear panels ill and 88, respectively, and these panels extend partway toward the left-hand side of the cabinet and form with the right-hand posts i i, end panel it, the underside of the housing chamber i5 and a door later to be referred to, a compartment for housing and concealing the actuating mechanism for the sewing machine as well as the operating treadle when the'latter is in its vertical inoperative position as will later be explained. The panels H and 1-5 are interconnected at their upper ends by the structure of the housing chamher 5%, as can readily be understood and at their lower ends by means of a brace l 9 extending from front to rear of the cabinet.

The compartment which has just been referred to is designated in the rawings by the letter A and said compartment can be closed and the parts located therein fully concealed by means of a door 29 hinged on its vertical rear edge to a vertically extending door strip 25 that is-secured to the rear panel E33. It will be seen that the door 2? closes the open inner or kneehole side of the compartment when swung to closed position as indicated by the dot and dash lines in Fig. 2. When the door Zil is'swung to its open position, as indicated in-full lines in Figs. 1, 2 and 3, it extends part way across the kneehole or operating space of the cabinet andadjacent the rear of said space.

The door 29 is provided with a pull knob 22 to facilitate the opening of the same and is held in its closed position by means of a spring pressed ball or detent 23 mounted in its free vertical edge and which engages in a recess 2 5 formed on the inner side of the panel ii. The recess M is indicated in Fig. 2, although this sectional view actually is taken below said recess. The upper edge of the door adjacent its free edge is provided with a keeper recess 25 that is engaged by the retaining end of a spring pressed cabinet latch 26 mounted-on the lower rear portion of the llO'llS-r.

When the leaves l2 and E3 are ing chamber 53 above the kneehole or operating space.

It will be understood that when the door 20 is moved to its open position its upper edge cams the cabinet latch 25 into position to allow the door to pass the same, after which the spring of the cabinet latch moves its retaining end into engagement with the keeper recess 25 in the door and the latter is held in its open position. Of course when it is desired to close the door it is necessary to manually move the cabinet latch 26 to allow the door to swing from its open position toward its closed position and when the door has passed the latch the latter can be released.

The actuating mechanism for the sewing machine head is in the form of a unit assembly and which assembly can be mounted as a unit in the compartment A. This unit assembly actuating mechanism comprises a supporting fram or bracket preferably in the form of an integral casting 2?. This frame or bracket comprises a horizontally extending arm Zia from the middle of which there is a downwardly extending bowed or curved arm 21?). The arms 27a, and Nb are also connected by a semi-circular guard 210. The ends of the arm Zia outwardly of the guard 2750 are secured to blocks mounted on the inner side of the end panel it within the compartment A, as indicated at 28. The arm Bib below the guard Zlc is downwardly extended and is secured as indicated at 29 to a block similarly mounted on the inner side of the panel I55.

The casting J? is similar to the ordinary combined frame or supporting bracket and dress guard customarily used on treadle operated sewing machines and is provided at its upper end and at the junction between the arms Na and 21b with a bearing boss 38 in which is mounteda stub shaft 3E. The supporting bracket?! is spaced away from the panel it sothat the main driving wheel 32 can be rotatably mounted on the stub shaft 3! between the supporting bracket 2? and the panel i6 and within the guard 210.

The driving wheel 32 has its periphery grooved to receive the driving belt 33 that extends upwardly into the housing chamber it and passes around the driven pulley on the sewing machine head as will be well understood. The driving wheel 32 is provided on its side adjacent to the panel It with a boss 3 that rotatably carries a crank arm 35. The free end of this crank arm 35 is rigidly connected to the upper end of a pitman 36, the lower end of which pitman is provided with a bearing sleeve 3'3 that is freely and pivotally mounted on a connecting pin 33.

The connecting pin 38 also has freely and pivotally mounted on it the sleeve-like portion 39 formed at one end of the actuating arm 40. The opposite end of this actuating arm is'provided with a yoke ii and with an enlarged bearing sleeve portion 2 midway of the yoke.

The arm Zlb of the supporting bracket 27 below its connection 29 to the panel it is provided with an integral downwardly and outwardly projecting extension 33, the lower end of which extension 13 is provided with an integral sleeve-like boss Ml which carries a fixed stub shaft :25. The bearing sleeve portion Q2 of the arm to is rockably mounted on the stub shaft iii by means of double cone ball bearings it, as clearly indicated in Fig. 57

It will be seen that the supporting frame or bracket 2'3, driving wheel '32, pitman 36 and actuating arm it can be operatively assembled into a unit and mounted in the compartment A of the cabinet as a unit assembly and when the arm 40 and its bearing sleeve portion 42 are rocked on the stub shaft 45 the driving wheel 32 will be rotated through its operative connection with the pitman 36, which in turn is operatively connected to the free end of the arm 40.

It will also be noted that the actuating arm 40 is operatively connected to the pitman 33 by a simple pivotal connection, since said arm only rocks or oscillates and that the relationship between the arm 40 and the pitman 36 once the actuating mechanism has been mounted in the compartment as a unit assembly need not be changed.

Of course, in order that the operator can conveniently rock the arm 40 to effect rotation of the driving wheel 32 of the actuating mecha-, nism, it is necessary to provide a treadle for such purpose and which treadle can be operatively located in the proper position in the kneehole or operating opening or space in the cabinet. It is also desirable that provision be made for moving this treadle when the sewing machine is not in use from its operative position in the kneehole opening or space of the cabinet to a concealed and inoperative position within the compartment A, and such movement should be accomplished independently of any movement of any part of the actuating mechanism.

In order to attain the ends just specified a treadle 41 is provided and this treadle preferably is in the form of a rectangular metal casting provided with a number of transverse openings. The treadle 4'! on its right-hand end, as viewed in the drawings, and midway between its front and rear edges is provided with an integral downwardly facing channeled extension 48, the free end of which is forked or cut away to provide spaced lugs or ears 48a. The extension 48 is of such width that the lugs or ears 48a. at the free end thereof extend between the sides of the yoke 4| of the arm 49.

The sides of the yoke 4! are provided with tapped openings therethrough into which are screwed pivot screws 49 having smooth conical inner ends 59 that project into conical openings formed in the lugs or ears 48a of the extension 48 of the treadle. By this arrangement the right-hand end of the treadle, as viewed in the drawings, is operatively connected to the arm 40 and in such way that the treadle 41 can be swung from a horizontal operative position in the kneehole or operating space of the cabinet without the compartment A into a substantially vertical inoperative position within the compartment or vice versa. It will be well to note that the movement of the treadle from operative to inoperative position or vice versa does not affect in any way the unit assembly actuating mechanism or the operative relationships between the various parts of said mechanism and is effected independently of any movement of any part of said mechanism.

It will be appreciated that when the treadle 41 is in its horizontal operative position in the kneehole or operating opening or space of the cabinet means must be provided for supporting the free end of the treadle. The arrangement now to be described provides such means, and it will be noted it is of such character as not to increase materially the overall length of the treadle when the latter is in its substantially vertical inoperative position in the compartment A. Therefore, it is possible with this arrangementto have the cabinet and the compartment A of minimum height, thus maintaining the dimensions of the cabinet in proper proportionand having the sewing machine head operatively located at the desired and proper height for convenient operation.

The treadle 41 on its under side is provided with longitudinally extending parallel ribs 52 equally spaced on each side of the longitudinal center line of the treadle. These ribs are interconnected at both ends and intermediate said ends by transversely extending ribs 52a. The left-hand and intermediate transverse ribs 52a are provided with openings axially aligned with each other and with the stub shaft 45. A shaft- 53 slightly longer than the treadle is mounted in the openings of the lugs 52 so as to slide freely therein. The right-hand end of the shaft 53, as viewed in Fig. 1, has fixed therein a transversely extending pin 54 forming an abutment for one end of a coil spring 55 that surrounds the shaft and has its opposite end abutting the middle rib 52a. The opposite end of the shaft 53, i. e., the left-hand end as viewed in Fig. 1, is reduced and rotatably supports a roller 56 held in position by a washer 51 secured to the end of the shaft 53.

In moving the treadle 41 into its horizontal operative position within the kneehole opening of the cabinet the left-hand end of the shaft 53 is pulled outwardly against the tension of the spring 55 and the roller 56 passed downwardly through the enlarged opening 58 of a retaining bracket 59 that is secured to the inner side of the panel l5 of the cabinet. Then when the operator releases his hold on the shaft 53 the spring 55 moves said shaft toward the right, as viewed in the drawings, to bring the roller 55 beneath the ears 50 formed on the upper side of the retaining bracket 59 and into engagement with the inner side of the outer end of said bracket.

It will now be seen that the treadle 41 is sup ported at its opposite ends for oscillating or rocking movement when in the horizontal operative position. When the treadle is rocked or oscillated the Weight or pressure of the treadle on the shaft 53 will, due to friction, cause said shaft to rock or oscillate with the treadle and the free end of said rocking or oscillating shaft will move in the roller 55. By using the roller 53 and the retaining bracket 59 the diameter of the bearing for the shaft 53 is reduced and also the bearing between the shaft and the roller can be lubricated, thus avoiding the necessity of putting lubricant in the retaining bracket 59.

In moving the treadle 41 from its horizontal operative position into its vertical inoperative position the operator grasps the shaft 53, moves the same toward the left against the tension of the spring 55 and until the roller 55 has passed from beneath the ears 60 and lies in line with the large opening 58 of the bracket 59, whereupon the shaft 53 with the treadle can be swung vertically upwardly about the pivot screws 49 and into the compartment A.

When the treadle 41 is sufficiently vertically inclined the shaft 53 will slide downwardly by gravity until the right-hand end of the shaft, as viewed in Fig. 1, engages the righthand rib 52a of the treadle, as which time only a relatively short portion of the shaft 53 at the end carrying the roller 55 will extend beyond the free end of the treadle. This results in materially shortening the overall length of the treadle including the shaft and allows it to be accommodated in the compartment A which, as has been previously pointed out, can be of minimum height as can also the cabinet.

-As the treadle and shaft 53 are swung-into the compartment A the exposed or roller carrying end of the shaft 53 strikes a bail (ii that is pivotally connected to-brackets 52 secured to a structural element 63 extending from front to rear of the cabinet above the doorway to the compartment A. Fhe exposed end of the shaft 53 swings the bail 6i inwardly-and the end of said shaft to pass thereby, after which the bail will swing downwardly by gravity until it engages the structural element 63, in which position it acts to retain the shaft 53 and the treadle il in the substantially vertical concealed inoperative position within the compartment A.

Assuming that the treadle ll is in the inoperative position within the compartment A, as indicated in dot and dash lines in Fig. 1, and the door it! of said compartment is in the ciosed position, the operator desiring to use the sewing machine moves the door 29 to its open position and until it is engaged by the cabinet latch .26 and then pushes the treadle and shaft 53 further inwardly of the compartm nt A and manually raises the bail 6i upwardly to a position wherein it clears said shaft, after which the treadle and shaft can be swung downwardly and outwardly about the pivot screws 4% and into a substantially horizontal position in the knee opening. This is followed by engaging the roller 55 in the retaining bracket as previously tie-- scribed, after which, so far the treadle and the actuating mechanism are concerned, the machine is ready for operation.

It will be well to again note that the movement of the treadle 4'! from inoperative to perative position and vice versa does not affect the relationship of the various parts of the unit assembly actuating mechanism, since the pivotal movement of the treadle is solely about the pivot screws 39 and is independent of any movement of any part of said mechanism.

Although a preferred embodiment of the invention has been illustrated and described herein it will be understood that the invention is susceptible of vari us modifications and adaptations within the scope of the appended claims.

Having thus described my invention, I claim:

1. In a sewing machine, a cabinet having a chamber for the head, an operating opening or space beneath said chamber, and a compartment adjacent said space or opening and at one end of said cabinet; an actuating mechanism for said head mounted in said compartment, a treadle, means forming a combined operative and supporting pivotal connection between said mechanism and one end of said treadle and always entirely within said compartment and about which connection the treadle may swing, independently of any movement of any part of said mechanism, from a substantially vertical inoperative position within said compartment to a horizontal operative position in said space or opening and without said compartment, and means for rockably supporting the free or other end of said treadle when in said operative position.

2. In a sewing machine, a cabinet having a chamber for the head, an operating space or opening beneath said chamber, and a compartment adjacent said space and at one end of said cabinet; an actuating mechanism -for said head mounted in said compartment, a treadle, means forming a combined operative and supporting pivotal connection between said mechanism and one end of said treadle and always entirely within said compartment and about which connection the treadle may swing, independently of any movement of any part of said mechanism, from a substantially vertical inoperative position within said compartment to a horizontal operative position in said space or opening and without said compartment, and means for rocaably supporting the free or other end of said treadle when in said operative position, said last mentioned means including a shaft slidably carried by said treadle and substantially contained Within the length of the treadle when the latter is in its inoperative position within the compartment.

3. In a sewing machine, a cabinet having a chamber for the head, an operating opening or space beneath said chamber, and a compartment adjacent said space and at one end of said cabinet; an actuating mechanism for said head mounted in said compartment, a treadle, means forming a combined operative and supporting pivotal connection between said mechanism and one end of said treadle and always entirely within said compartment and about which connection the treadle may swing, independently of any movement of any part of said mechanism, from a substantially vertical inoperative position within said compartment to a horizontal operative position in said space and without said compartment, and means for rockably supporting the free or other end of said treadle when in said operative position, said last means including a shaft slid-ably carried by said treadle and substantially contained within the length of the treadle when the latter is in its inoperative position within the compartment, and a spring on said shaft tending to urge the same toward said one end of said treadle.

4. In a sewing machine, a cabinet having a chamber for the head, an operating space or opening beneath said chamber, and a compartment adjacent said space or opening and at one end of said cabinet; an actuating mechanism for said head mounted in said compartment, a treadle, means forming a combined operative and supporting pivotal connection between said actuatingmechanism and one end of said treadle and about which the treadle may swing, independently of any movement of any part of said mechanism, from a substantially vertical inoperative position within said compartment to a horizontal operative position in said space and without said compartment, and means for rockably supporting the free or other end of said treadle when in said operative position, said means including a bracket carried by the other end of said cabinet and within said space or opening, a shaft extensibly carried by said treadle, a roller mounted on one end of said shaft and cooperating with said bracket, and a spring carried by said shaft and acting to maintain said roller in engagement with said bracket.

5. In a sewing machine, a cabinet having a chamber for the head, an operating space beneath said chamber, and a compartment adjacent said space and at one end of said cabinet; an actuating mechanism for said head in the form of a unit assembly mounted and always contained entirely in said compartment and including an actuating arm and a pivotal bearing for said arm about which said arm can rock; a treadle means pivotally connecting one end of said'treadle to said arm to support said one end of the treadle to rock with said arm and to swing, independently of any movement of said arm, from a substantially vertical inoperative position within said compartment to a horizontal operative position in said space and without said compartment, and means for rockably supporting the free or other end of said treadle when in said operative position.

6. In a sewing machine, a cabinet having a chamber for the head, an operating space be neath said chamber, and a, compartment adjacent said space and at one end of said cabinet; an actuating mechanism for said head in the form of a unit assembly mounted and always contained entirely in said compartment, said mechanism being of the type including a driving wheel, apitman connected thereto, an actuating arm connected to said pitman, and a pivotal bearing for said arm and about which it can rock; a treadle, means pivotally connecting one end of said treadle to said actuating arm to support said one end of the treadle to rock with said arm and to be swung, independently of any movement of said arm, fro-m a substantially vertical inoperative position within said compartment to a horizontal operative position in said space and without said compartment, and means for rockably supporting the free or other end of said treadle when in said operative position.

7. In a sewing machine, a cabinet having a chamber for the head, an operating space beneath said chamber and a compartment adjacent said space and at one end of said cabinet, an actuating mechanism for said head and in the form of a unit assembly mounted and always contained entirely in said compartment, said mechanism being of the type including a supporting bracket, a driving wheel rotatably carried by said bracket, a pitman operatively connected to said wheel, a bearing support carried by said bracket, an actuating arm rockab1y mounted on said bearing support and operatively connected to said pitman; a treadle, means pivotally connecting one end of said treadle with said arm to support said one end of the treadle to rock with said arm and to be swung, relative thereto and independently of any movement thereof, from a substantially vertical inoperative position within said compartment to an operative position in said space and without said compartment, and means for rockably supporting the free or other end of said treadle when in said operative position.

8. In a sewing machine, a cabinet having a chamber for the head, an operating space beneath said chamber and a compartment adjacent said space and at one end of said cabinet; an actuating mechanism for said head always located entirely within said compartment and in the form of a unit assembly including a supporting bracket attached to said one end of said cabinet and within said compartment; a rockable treadle for operating said actuating mechanism, means entirely within said compartment operatively associating said treadle and mechanism and pivotally connecting one end of said treadle with said bracket to support said one end and enable said treadle to be swung, independently of any movement of said actuating mechanism, from a substantially vertical inoperative position Within cabinet having a chamber for the head, an operating space beneath said chamber, a compartment adjacent said space and at one end of said cabinet, and an actuating'mechanism for said head and located in said compartment; a'rockable treadle for operating said mechanism, and means carried by said one end of said cabinet and always entirely within said compartment and forming the sole operative connection between said treadle and mechanism and pivotally supporting one end of said treadle for movement about a substantially horizontal axis whereby said treadle may be swung from a substantially vertical inoperative position within said compartment to a substantially horizontal operative position without said compartment.

10. In a sewing machine of the type including a cabinet having a chamber for the head, an op. erating space beneath said chamber, a compartment adjacent said space and atone end of said cabinet, and an actuating mechanism for said head and located in said compartment; a rockabl treadle for operating said mechanism, and means carried by said one end of said cabinet and always entirely within said compartment and forming the sole operative connection between said treadle and mechanism and pivotally supporting one end of said treadle for movement about a substantially horizontal axis whereby said treadle may be swung from a substantially vertical inoperative position within said compartment to a substantially horizontal operative position without said compartment, and means for supporting the other end of said treadle relative to the other end of said cabinet when said treadle is in the operative position.

11. In a sewing machine of the type including a cabinet having a chamber for the head, an operating space beneath said chamber, a compartment adjacent said space and at one end of said cabinet, and an actuating mechanism for said head and located in said compartment; a

rockable treadle for operating said mechanism,

and means carried by said one end of said cabinet and always entirely Within said compartment and forming thesole operative connection between said treadle and mechanism and pivotally supporting one end of said treadle for movement about a substantially horizontal axis whereby said treadle may be swung from a substantially vertical inoperative position within said compartment to a substantially horizontal operative position without said compartment, and means for supporting the other end of said treadle relative to the other end of said cabinet when said treadle is in the operative position, said last means including a shaft slidably carried by said treadle.

12. In a sewing machine of the type including a cabinet having a chamber for the head, an operating space beneath said chamber, a compartment adjacent said space and at one end of said cabinet, and an actuating mechanism for said head and located in said compartment; a rockable treadle for operating said mechanism, and cooperating means carried by said mechanism and treadle and pivotally supporting one end of said treadle to provide for swinging movement of said treadle from a substantially vertical position within said compartment to a substantially horizontal position Without said compartment, said means also operatively connecting said mechanism and treadle whereby rocking of said treadle operates said mechanism.

13. In a sewing machine of the type including a cabinet having a chamber for the head, an op-' crating space beneath said chamber, a compartment adjacent said space and at one end of said cabinet, and an actuating mechanism for said head and located in said compartment and supported by said one end of said cabinet; a rockable treadle for operating said mechanism and cooperating means carried by said mechanism and treadle and forming the sole support for said treadle within said compartment, said means pivotally connecting said treadle with said mechanism along a substantially horizontal axis whereby said treadle may be swung from a substantially vertical inoperative position within said compartment to a substantially horizontal operative position without said compartment, said means also operatively connecting said treadle and mechanism whereby rocking movement of said treadle operates said mechanism.

14. In a sewing machine, a cabinet having a chamber for the head, an operating space beneath said chamber, and a compartment adjacent said space and at one end of said cabinet; an actuating mechanism for said head mounted in said compartment and including an actuating arm having a forked portion and a pivotal support for said arm; a rockable treadle for operating said mechanism and having a forked portion cooperating with the forked portion of said actuating arm, and means pivotally connecting the forked portion of said arm and the forked portion of said treadle whereby rocking movement of said treadle operates said actuating mechanism and said treadle can be swung from an inoperative substantially vertical position within said compartment to an operative substantially horizontal position without said compartment.

NATHANIEL E. COLEGROVE.

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