US1739751A - Clutch - Google Patents

Description

1929- J. s. CARTWRIGHT ET AL CLUTCH Filed June 7, 1928 2 Sheets-Sheet fiwcnlars: James 51 Carlw rglufi, T lwmas Davey,

Dec. 17, 1929. J. s. CARTWRIGHT ET AL 1, 3

CLUTCH Filed June 7, 1928 2 Sheets-Sheet 2 Inventors: Jalnes S. Carlwrzght,

Ihoms'laveg,

Patented Dec. 17, 1929 UNITED STATES PATENT OFFICE 1 JAMES SHELDON CARTWRIGHT AND THOMAS DAVEY, F WINTHROP, MASSACHUSETTS CLUTCH Application filed June 7, 1928. Serial No. 283,536.

This invention relates to clutches and has for its object the production of a simple but eflective device of this character which may be applied readily to a sewing machine actuated by an electric motor.

This object is attained by the mechanism illustrated in the accompanying drawings.

For the purpose of illustrating the invention, one preferred form thereof is illustrated in the drawings, this form having been found to give satisfactory and reliable results, although it is to be understood that the various instrumentalities of which the invention consists can be variously arranged and organ- "ized, and the invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and described except as required by the scope of .the appended claims. Of the drawings:

Figure 1 represents a vertical section of a clutch embodying the principles of the present invention and showing in elevation a portion of a sewing machine and the motor for "driving same.

Figure 2 represents a section of same on line, 2,2, on Fig. 1. I

Figure 3 represents a plan of the expanding ring and a portion of the hub on which it 1s mounted.

Figure 4 represents a section on line 4, 4, on Fig. 3, and I Figure 5 represents a vertical sectionon line 5, 5, on Fig. 1.

' Similar characters indicate like parts throughout the several figures of the drawings.

In the drawings, 10 is a portion of theframe of a machine from which extends the driving shaft 11 thereof.

This frame 10 is provided with a bracket 12 on the outer end of which is mounted an electric motor 13 which may be of any well known'construction.

The motor 13 is provided with a driving shaft 14 in alinement with the shaft 11, of the machine to be operated.

Secured to the driving shaft 14 is a collar 15 having pins 16 extending therefrom into A openings 16 in a disk 17 which is slidably mounted on the shaft 14.

The hub of this disk 17 has an annular groove 18 in the periphery thereof into which project the trunnions 19 of a lever 20 pivoted at 21 to the bracket 12.

The lever 20 has an arm 22 adjustably mounted thereon and clamped thereto in ad justed position by a bolt 23.

This arm 22 has a rearwardly extending bar 24 secured thereto by a pin 25, the outer end of said bar being pivoted by pin 26 to a lever-actuating rod 27, the lower end of which is connected to any suitable operating device such as a treadle. 7

'As the treadle forms no part'of the present invention it is not considered necessary to illustrate the same.

'A spring 28 between the arm 22 and bracket 12 normally retains the disk 17 in the position shown in Fig. 1.

When the motor 13 is in operationthe driving shaft 14 thereof will impart rotary move ment to the reciprocating disk 17 by means of the members 16 positioned in the openings 16 in the hub of said disk.

One face of the disk 17 is provided with a recess 28 in the bottom of-which is disposed a sheet 29 of cork or some similar material. g

The shaft 11 has secured thereto a flywheel 30 the hub 31 of which is cone-shaped with its outer end extending into the recess 28 of disk 29.

A plate 32 is secured to the hub 31 by means of screws 33 having heads 34 adapted for reciprocation in depressions 35in said hub 31.

This plate 32 has limited movement towards and from the outer end of hub 31 and under normal conditions is retained in a position slightly separated from thecork sheet 29 by means-of a spring 36, as shown in Fig. 1.

When in 'thisposition the motor 13 may be driven without imparting any rotary movement to the shaft 11.

The plate 32 has an annular flange 37 extending into an annular groove 38 in a split ring 39 surrounding the hub 31 of flywheel 30."

i The width of the groove 38 is greater than the thickness of the flange 37 thereby permitting the expansion of the split ring 39.

The inner face of this ring is tapered to conform to the cone-shaped periphery of the hub 31 which has extending therefrom a wedge-shaped projection 40, the opposite faces of which contact with the adjacent ends of the splitring 39. i 1

When the split ring 39 is forced toward'the flywheel. 30 the inclined faces of the wedge 4,0 will expand the ring slightly, so that the' periphery thereof will be brought into frictional contact with the inner cylindrical Wallof the recess 28*.

When the frictional contact is sufficient to bind the ring 39 and disk 17 together the full speed of the motor shaft 14 will be imparted to the driving shaft 11 of the machine.

Radial pins 41 in the split ring 39extend through slots 4:2 in the flange 37 to tie the ring and plate 32 together while permitting the expansion of said ring 39'. I

The ring 39 is made of spring metal and will return to its normal position when again moved outwardly on the hub 31.

The outer endof the arm 22 has an opening 43 extending therethrough in which is disposed the projection 44 of a plate 45 having friction disks 46 secured thereto in depressions 47 "at opposite ends thereof A headed stud 48 secures 'a' .washer 49 to the outer end of; the projection 4.4 which provided to insureboth pads tfi always con tacting with the flywheel 30,when it is de-, siredto-retardand stop the rotating of said wheel. 8

l Vith the parts in the position indicated inFigi 1 of the drawings, the motor 13 can rotate without imparting any'rotary move ment torthe drivin-gshaft 11 but as soon as theoperatorractuates the treadle to move the upper endgofithe lever 22 towards the left;

the friction pads-46" will beremoved from theiperiphery -of the-flywheeh30 and the cork sheet 29, will be forcexlginto contactv with the plate 32.; within the recess 2 2,8? of the disk 17.

This gramm r contact between the. cork.

sheet 29 and the plate;..-32;will cause-the split the shaft 111, this rotation, bein transmitted fl e-ugh he We g dmember Q ci ieh blof" thefiywheel thereby causing the latterto-rm tate and transmit a slow rotary movement to said shaft 11.

The continued movement of the lever 20 to the left will force the split ring toward the flywheel 30 and owing to the wedged shape of the projection 40 this ring 39 will be expanded until its periphery comes into contactwith the cylindricaLwall of :therecess 28* formed in the disk 17 Further movement of the ring 39 to the leftof 1 ;willecause it to be firmly locked;

between the cone-shaped hub 31 of the flywheel 30 and said cylindrical wall so that the disk 17, the flywheel 30, and driving shaft 11 will rotate at the same speed as that of the shaft 14: of the motor 13. a a

As soon as the operator removes his foot from the treadle the spring 28 will cause the lever 20 to move clockwiseabout its pivot 21, thereby moving the their 17 to the right. and

permitting the spring 36' to moveythe plate to its normalposition as indicated in Fig,.

1, at which time the spring of the metal. in

the split ring 39 will cause it to beremoved from contact with thecylindrical walliofthe.

recess 28*.

While the clutch parts-are being disen'ff gaged in the manner just described, the fric tion pads 46 will be moved into contactj with the periphery ofthe flywheel]30;to' retard further movement of said flywheel-and then prevent all rotation thereof} It is believed that'the operation and many; advantages of the invention will be under stood without further description.

Having thus described our'invention, we claim 1'. The combination of two alined' shafts; a flywheel on'one shaft'providedlwitha coneshaped hub; a motor to drive the other'shaft'; a disk slidable onand rotatable with the mo tor shaft and provided with a cylindricaljrecess in one face thereof; a splitiring fittedgto and rotatable with said huh and idisposecl in said recess, said ring having an annular groove in its outer face; a plate revoluble with said'hub having aflange extending into said groove; andawedge member onsaid-hub between the ends Qfsaidringadapted toexv pand said ring when moved inwardly on said hub;

2; The combination 0ftw0-alined shafts a flywheel on one shaft provided with, arf

coneshapedihuh; a motor to -drivevtheother shaft a 1 disk; slidahle on and rotatable with the motor shaft and providedfw ith'a;cylindriV calrrecess in one face thereefjg; a, split ring fitted to irotatahle-with said vhuh and posed in 53161 1360855 sa d r ng -having an an nular groove in its outer face r a-plat e revolu;

ble with said hub hav-ing a flange.,,extending intosaid groove; means for, limiting the out;

ward movement of said plateto prevent con tactv nde ormal onditian (with; he-bet:

m f ai frece s; landf dge. member on said hub between the ends of said ring adapted to expand said ring when moved inwardly on said hub.

3. The combination of two alined shafts; a flywheel on one shaft provided with a coneshaped hub; a motor to drive the other shaft; a disk slidable on and rotatable with the motor shaft and provided with a cylindrical reccss in one face thereof; a split ring fitted to and rotatable with said hub and disposed in said recess, said ring having an annular groove in its outer face; aplate revoluble with said hub having a flange extending into said groove; two screws secured to said plate and reciprocable in said hub and provided with heads to limit the outward movement of the plate; and a wedge member on said hub between the ends of said ring adapted to expand said ring when moved inwardly on said hub.

4:. The combination of two alined shafts; a flywheel on one shaft provided with a coneshaped hub; a motor to drive the other shaft; a disk slidable on and rotatable with the motor shaft and provided with a cylindrical recess in one face thereof; a split ring fitted to and rotatable with said hub and disposed in said recess, said ring having an annular groove in its outer face; a plate rotatable with saidhub having a flange extendinginto said groove, said flange having a thickness less than the width of said groove to permit the expansion of the split ring; and a wedge member on said hub between the ends of said ring adapted to expand said ring when moved inwardly on said hub.

5. The combination of two alined shafts; a flywheel on one shaft provided with a coneshaped hub; amotor to drive the other shaft; a disk slidable on and rotatable with the motor shaft and provided with a cylindrical recess in one face thereof; a split ring tted to and rotatable with said hub and disposed in said recess, said ring having an annular groove in its outer face; a plate rotatable with said hub having a flange extending into said groove, said flange having a thickness less than the width of said groove to permit the expansion of the split ring; radial pins in said ring extending through slots in said flange; and a wedge member on said hub between the ends of said ring adapted to expand said ring when moved inwardly on said hub.

('3. The combination of two alined shafts; a flywheel on one shaft provided with a conesha'ped hub; a motor to drive the other shaft; a disk slidable on and rotatable with the motor shaft and provided with a cylindrical recess in one face thereof; a split ring fitted to and rotatable with said hub and disposed in said recess, said ring having an annular groove in its outer face; a plate revoluble with said hub having a flange extending into said groove; a spring between said hub and plate to force the plate outwardly; means for limiting the outward movement of said plate; and a wedge member on said hub between the ends of said ring adapted to expand said ring when moved inwardly on said hub.

r7. Thecombination of two alined shafts; a flywheel 011 one shaft provided with a coneshaped hub; a motor to drive the other shaft; a disk slidable on and rotatable with the motor shaft and provided with a cylindrical recess in one face thereof; a split ring fitted to and rotatable with said hub and disposed in said recess, said ring having an annular groove in its outer face; a plate revoluble with said hub having a flange extending into said groove; a sheet of resilient material in the bottom of said recess normally free from contact with said plate; and a wedge member on said hub between the ends of said ring adapted to expand said ring when moved inwardly on said hub.

8. The combination of two alined shafts; a flywheel on one shaft provided with a coneshaped hub; a motor to drive the other shaft;

a disk slidable on and rotatable with the motor shaft and provided with a cylindrical recess in one face thereof; a split ring fitted to and rotatable with said hub and disposed in said recess; means for moving saiddisk end wise and expanding said ring into frictional contact with the cylindrical wall of saidrecess; and a brake member operable by said moving means coacting with said flywheel when the clutch parts aredi'sengaged.

9. The combination of two alined shafts; a flywheel on one shaft provided with a coneshaped hub; a motor to drive the other shaft; a disk slidable on and rotatable with the motor shaft and provided with a cylindrical recess in one face thereof; a split ring fitted to and rotatable with said hub and disposed in said recess; and means for moving said disk endwise and first imparting slow rotation to said hub and then expanding said ring into frictional contact with the cylindrical wall of said recess to rotate the flywheel at full speed.

10. The combination of two alined shafts; a flywheel on one shaft provided with a cone-shaped hub; a motor to drive the other shaft; a disk slidable on and rotatable with the motor shaft and provided with a cylindrical recess in one face thereof; a split ring fitted to and rotatable with said hub and disposed in said recess, said ring being normally free from contact with said disk; and means for moving said disk endwise and first imparting slow rotation to said hub and then expanding said ring into frictional contact with the cylindrical wall of said recess to rotate the flywheel at full speed.

11. The combination of two alined shafts; a flywheel on one shaft provided with a coneshaped hub; a motor to drive the other shaft; a disk slidable on and rotatable with the m0- tor shaft and provided with a cylindrical recess in one' face thereof; a split ring-fitted to and rotatable with said hub anddisposed.

in said recess; and means for moving said disk endWise of said motor shaft and" expanding saidiringinto frictional contact With the cylindrical wall of said recess.

12. The combination of two alinedshafts; a flywheel'on one'shaft provided With-a coneshaped hub amotor to drive the other shaft; a: disk slida'ble-on and rotatable with the m0- tor shaft" and provided with a-- cylindricalreoess in one face thereof;'a split ring-fitted to and; rotatable with said hub and I disposed in. said recess, said ring being normally free from contact: with said disk; andmeans for moving'said disk-endwise of said motor and expanding saidring into frictional contact with the cylndrical Wall ofsaid recess.

13'; Thecombination of two alined shafts; a member on one shaft provided with a coneshaped :hub a motor to drive-the other shaft; another member rotatable with the motorshaft; and provided'with a cylindrical recess inaoneefacethereof; a split ring fitted'to androtatable withisaidhub and disposed in said recess; andmeans for moving one member endtvise. of; the shaft on which it is mounted and expanding said ringrinto frictional contactvwith thecylindrical Wall ofsaid recess. I

Signed'by usiati746 Qld South Building Boston .M'assachusetts, this 5th day of June,

' JAMES S. CARTVVRIGHT.

THOMAS DAVEY;

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