US1931305A - Motor attachment - Google Patents

Description

Oct. 17, 1933. M. TAIGMAN 1,931,305

MOTOR ATTACHMENT Filed June 50, 1931 INVENTOR MAX TAIGMAN ATTORNEY Patented Oct. 17, 1933 7 MO TORA TTACHMENT M axTa igman, Brooklyn, N. Yr Application June so, 1931. Serial No. 547,892 I for connecting and disconnecting at will the motor and machine with incidental closing and intercepting of the motor circuit and braking'of the machine driving parts while permitting free-' dom of rotary movement of the motor shaft, and

10 in general the invention relates to an improvement and development 'of the invention disclosed in my Patent No. 1,463,449 granted July 31, 1923.

The primary object of the invention is to provide a simplified, compact form of motor attachment which will combine in a single unit the motor controlling switches, the pulley brake and control lever all assembled in a single unit organized and constructed so as to be easily and quickly mounted directly on a conventional form of electric motor now in general use for driving sewing machines and like mechanisms, and thus avoid any necessity for providing a separate mounting for these parts, as .is disclosed in my prior' patent above identified." 1 u l In such'constructionsit is a usual practice to provide a :treadle operated control linkor rod for actuating the combinedv clutch and circuit control lever forming a part of. such control mechanism and this treadleactuated member usually extends vertically, or almost so, between the treadle and the lever which it operates. Unless extreme care is exercised in mounting the parts so that the pull of this linkon the. lever takes, placein a single plane, there resulted a binding-action on the lever on its fulcrum which seriously interfered with the desired. freedom of movement of these parts. Accordingly, the present disclosure features a form of mounting of the control lever constructed so'that'it may be readily adjusted on its support, in the illustrated case shown to be the motorcasing, in such way that the pull of the treadle or other control rod on the lever will be at right angles, or substantially at right angles, to the effective length (Sf-the lever thereby to minimize binding action at 'its' fulcrum and permit a freedom of swing of the lever about its' fulcrum. r Variousfother objects and j advantages of the invention will be in part obvious from an inspection of the accompanying drawing'and in part will be more fully set forth in the following par ticular description of one form of mechanism embodying the invention, and the invention also consists in certain new and novel features of I The invention relates in general to an im V e '1 Claim. (Cl. 192-.02)

construction and combinationof parts hereinafter set forth and'claimed. V M In the accompanying drawing: a l. Fig. 1 isa view in side elevation of a preferred embodiment of the invention with parts-of the bracket arm broken away to show the brake; and Fig. 2 is a vertical sectional view takenon the line 2-2 of Fig. 1, looking in'the direction indicated by the arrows; 1 l l Referring to the drawing, there is shown-an electric motor 10, the casing 11 of which is pro-. vided at one end with a motor hub 12, the outer peripheral surface 13 of'which provides a 'cy1in-. drical bearingon which is mounted the ,unit 13 herein featured. The motor. is providedwith'a shaft 14 which projects exteriorly of the casing 11 through the bearinghub 12. The externally projecting portion of the motor shaftv supports a clutch 15 which clutch comprises an axially fixed element 16 secured thereto byscrew 17 and rotat ing therewith; A coacting clutch member18 is normally free torotate on shaft l4xand is provided at one end with amachinedriving'pulley 19 .and at the other end with a cylindrical braking drum 20. It is understood that the pulley is to be connected to'drive a sewing or otherform of machine actuated therebythrough a belt connection as iswell known in this art. The shiftable element 18-is.provided witha hub 21 in the,- outer end of which is mounteda roller 22 adapted to be engaged by the'control lever hereinafter described to shift the floating clutch element 18 into frictional driving engagement with its coacting drivingelement 16.. r

Demountably secured on and supported entirely from the motor is a bracket23 for;supporting the several motor and clutch control'parts hereinafter described. Bracket 23 includes a centrally depending rugged portion, 24, thelower end of which is bifurcated and this bifurcated portion is 1 95 designed so as to fit snugly about the bearing portion 13 of the hub 12, for adjustable rotation about .the axis of the shaft 14. This adjustment feature is designed to compensate for variations from the horizontal of the support 25 on which the motor is located. In order to show such variations. from normal, t is noted'that thesupport 25 in Fig. 2 has its right side disposed a. little higher thanv the left side,but the manually actuated control rod or member 26 is shown to extendin a vertical direction from its point of 7 connection with the control lever 27. I The lower ends of the bifurcated portion terminates in parallel lugs 28 secured in' clamped position by a binding screw 29. Extending from one side'llO the rod and lever.-

through lead 46 with the switch 45.

of the rugged depending portion 23 of the bracket as viewed in Fig. 1 is an I-arm which arches over the clutch 15 and terminates at its outer end in a fulcrum bearing 31 positioned over the outer end of the hub portion 21 of the shiftable clutch member 18. From the opposite side of the central portion 24 of the bracket extends a switch supporting portion 32 which is disposed to overlap the motor 10 and in general the bracket and the parts carried thereby are designed to feature compactness and to be contained in the free space about the motor casing and its clutch supporting shaft.

The combined circuit and clutch control lever 27 is fulcrumed on pivot pin 33 carried at bearing 31 and comprises'a relatively short depending clutch controlling arm 34, in a lower cylindrical hub portion 35 of which is mounted on a bearing screw 36 for engaging the roller 22 in shifting the clutch element 18 into its clutching position. The control lever 27; includes a relatively long powerful leverage arm 37 which overlaps the motor 10 and is provided at its free end with an eye 38 in which the lower end of control rod '26 is looped ,to provide a pivotal connection between A vertically extending spring 39 secured'to the lever arm'27 intermediate its ends and has its other end secured by pin 40 to the bracket portion 24 and acts normally to shift the lever into position to release the clutch, apply the clutch brake and intercept the current flow through the motor. The long arm 37 ofthe control lever is provided adjacent; the fulcrum pin 33 with a brake 41 designed to engage the brake surface 20 on the clutch element 18 to restrain rotary movement of the element when control arm 34 moves to the right to release the driven clutch element 18 from the driving clutch element 16. The brake includes abrake bracket 42 pivoted to thearm 27 at 43 and secured in adjusted position by set screw 44 designed to adjust the brake bracket to compensate for wear on the portion of the brake which engages the shiftable clutch element 20. Mounted upon the part of the bracket 32 overhanging the motor is a switch 45 forming part of the motor circuit which supplies motor 10 and current to which is supplied through electric leads v46 as is usual in such constructions. The movable element 47 of switch 45 is controlled by a circuit closer lever 48 centrally pivoted on fulcrum pin 49 with one end underlapping and in bearing engagement with the shiftable element 47 and theother end provid'ed withan upstanding finger 50 on which the outer free end of long arm 37 rests. Forming part of the switch construction 45 is a mainswitch 51 provided with a manually actuated knob 52 for connecting the source of electric supply In operation and assuming that the parts are in the position shown in Fig. 1, with the current on and the motor 10 active, it will be under stood'that normally spring 39 is acting to shift the control'lever 27 into that position where brake 41 is actively disposed to restrain rotary movement of the shiftable clutch element 20; that the bearing arm 34 is shifted to the right to release the clutch and that the long arm 37 is lowered to intercept the motor circuit at switch 45. -By treadle orother control action the rod 26 is lifted vertically against the tension of spring 39 has one end and this acts with the powerful leverage effect provided by the long arm 3'7 to cause a powerful action of short arm 34 on the clutchto. connect the motor through the clutch 15 with the machine driven by the motor. At the sametime the elevating of the free end of arm 37 will permit the switch element 47 to drop with the right hand side of lever 48 thus closing the circuit, through the motor at switch 45 andthus energizing the motor to drive the clutch and through the clutch to drive the sewing or other machine belted to pulley 19. I

Releasing the control tension on rod 26 when it is desired to intercept the action of the driven machine permits the spring 39 to react and restore the parts to their normal, unclutched, circuit-closing and brake-applying position as previously indicated.

a completeattachment designed to fit different standard forms of motors and which may be conveniently positioned either directly on any one of several makes of motors or on a separate support provided therefore adjacent the motor, and in this way eliminate any necessity for av separate driving connection between the motor and clutch as was necessaryv in the above identified patent; In the illustrated case, the mounting of all the control parts directly on the hub of themotor providesnot only a convenient ,supportforthe unit but incidentally provides a form of rotatably adjusted support which will insure the mounting of the control lever 27 in such'way that the pull'of the rod 26 will be in the plane of movement ofthe' lever '27 thus eliminating binding action on fulcrum pin 33 which would otherwise be very apt to occur withincidental interference with the freedom'of movement of this control lever.

The positioning of the brake adjacent the fulcrum133 while spacing its actuating spring 39 provides for a powerful leverage effect with resulting mechanical advantage in favor of the brake and at the same time the locating of the brake between the fulcrum and spring permits the utilization, of the long arm to accommodate the brake in proper position to act on the clutch .without necessity for providing 'a' separate brake support.

I claim: In a device of the class described, the com-- bination of a motor having a hub at one end and having its shaft extending centrally through the hub; a clutch carried by the shaft, a bracket including a central depending portion carried by the hub and including an-arm' projecting from the upper part of the central portion and overlapping the clutch, a lever pivoted to said arm and including a short clutch control arm, a long leverage arm, a brake part pivoted to the long leverage arm for engaging one of the elements of the clutch, said brake part including a brake bracket pivoted to the long lever arm to move bodily therewith and provided with means for adjusting the frictional engaging portion of the brake relative to the lever to compensate for the wearing away of the portion of the brake which engages the clutch anda manually actuated control engaging the long arm at its free end. a

' MAX TAIGMAN.

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