US1483462A - Power-transmitting mechanism - Google Patents

Description

Feb. 12 1924.

M. MQCANN POWER TRANSMITTING MECHANISM Filed June 8, 1922 iv @v anvwtoz Patented Feb. 12, 1924.

MICHAEL McCANN, or GLENMORE, NEW YORK, ASSIGNDR ro FREDERICK Perry, A CORPORATION on NEW YORK." I

OSANN COM- POWER-TRANSMITTING BEECHANISM.

Application filedlune 8,

T0 aZZ whom it may concern. 1 Be it known that I, MICHAEL MOCANN, a citizen of the United States. and resident of Glenmore, in the county of Queens and State of New York, have invented certain new and useful Improvements in Power-Transmitting Mechanisms, of which the following is a specification. 1

This invention relates to power transmit ting devices and has particular reference to a mechanism for transmitting power adapted for use on sewing machines.

The object ,of-the invention is to provide a simple, practical. novel and generally improved friction drive or power transmitting mechanism adapted to be secured underneath a sewing machine table-or work bench for transmitting power from a motor to the sewing machine or other mechanism on the work bench. I 1

Another object of the. invention is to provide a power transmitting mechanism for the purpose set forth adapted to :be assembled and mounted as a single unitand provided with the necessary adjustingmeans for obtaining maximumnefliciency.

Other objectswill appear as this specifica tion proceeds while reference is had to. the accompanying drawing in which':

Figure 1 is a front elevation of a power transmitting mechanism embodying the invention with parts omitted and parts broken away. i

Figure 2 is an end view of the mechanism looking from the left in Figure 1.

' Figure 8 is a detail sectional plan view on line 3-'--?) of Figure 1 with parts broken away and'parts omitted Figure 1 is a diagrammatic viewillustrating the normal. inactive positions of the driving and the driven member in the mechanism. i W Figure 5 is a. diagrammatic: view illustrating the driving and the driven members in operativeactive positions.

Referring first to Figure 4-the reference 3 numeral .6 denotes a driving member:diagrammatically represented by the inner dotted circle, while the numeral 7 denotes a driven 'member represented diagrammati' cally by the outer dotted circle. Normally these two members. are in the positions shown, that is the drivingmember may be 1922; Serial No. 566,783.

rotated. or operated continuously, while the dr1ven member remains inoperative.

When, however, motion is to be imparted to the driven member it is moved so as to engage the driving member eccentrically as shown in Figure 5.

In the preferred arrangement described and illustrated herein, the inner driving member may be in the form of a motor oper ated friction pulley, and the driven member may be in the formof a hollow or cup shaped wheelhaving an interior driving or friction surface adapted to engage the driving surface of the driving pulley. And of course,-. it is within, the intended and legitimate scope of this invention, that the inner member may be. driven by the outer member.

It will be seen from Figure 5 that this engagement while the members are running together: Another advantage Is that. in

locating one member within the other, a material saving 1n space is effected.

In the preferred embodiment of myinvention the inner driving member, consists of a a pulley 9, see Figure 3, provided with a friction band or member '10 firmly secured to the pulley which l'atter is' carriedby and operated 'by a suitable prime mover. as for instance the electric motor indicated at 11.

The driven member consists of the hollow or-recessed. wheel12 having an interior surface 13 adapted to be 'frictionally and operatively engaged by the friction member Thus it is obvi- 10on the pulley'9 as is obvious. The wheel 12 is preferably integral with a two stepped belt unit comprising the smaller and the larger belt pulleysi15 and 16 respectively. A belt 17 may run over either of said pul- "leys 15 and 16;

A bearing sleeve 18 is preferably integral with the wheel and pulleys aforesaid, so that the members 12. 15, 16 and 18 constitute an integral driven unit. Saidumt is rotatably carried on a hollow shaft 15 which has a head or disk 26 whereby said drix' ing unit is retained on the shaft. The latter is clamped in a hanger 21 by means of a screw 22 in a well known manner. The hanger 21 is pivoted on the adjustable pivot screws 22, 22 provided with lock nuts 24;, 24:. 25 is an operating arm on said hanger and 26 is a treadle rod for operating the hanger, the shaft and the driven unit.

The pivot screws 22 are carried by a fixed brake yoke 27 provided with a vertical base 28 and a horizontal brake arm 29. The base 28 is secured to the base lug 30 by means of a bolt and nut 31, 32. The bolt passes through a. slot 38 in the base lug 30 thus providing for vertical adjustment ofthe brake yoke.

In order to prevent the yoke from turning on the base lug, the yoke has a key 34: which slides in a groove 35 in the base, see Figure 3. I

The numeral 36 denotes a brake lever which carries a brake shoe 37 of leather or other suitable material. The brake lever isadjustably secured to the brake arm 29 by means of a bolt 38 and nut 39. The bolt passes through a slot 4L0 in the brake lever to permit of lateral adjustment of the brake shoe withrespect to the wheel 12. I In order to prevent turning of the brake lever on the brake arm, the arm has a key 41 which slides in a way 42 in the lever.

The wheel 12 is kept in contact with the brake shoe 37 by a spring 4B which is seated in the yoke 27 and presses against the hanger 21 below the pivots 22, 22. The

spring 18 thus urges the hanger with the shaft 19 and the driven unit to the right in Figure 2, or the spring, as stated, presses the wheel 12 against the brake shoe 37.

The base lug is preferably integral with the main base 4-4: to which the motor 11 is secured. The base 14: is secured on the underside of the work bench 45. The machinery to be driven by the belt 17 is mounted on top of the bench (not shown) and suitable provisions are of course made for running the belt 17 upwards through the bench to drive the machinery thereon. The parts and details are not shown as they form no part of the invention. Neither is the usual treadle mechanism illustrated for pulling the treadle rod 26 downward. An oil cup 46 of usual design for lubricating the: shaft 19 and driven unit 1216- is mounted on the end of the shaft. see

. Figure 1.

During the operation the motor will be lcept operating and thus continuously rotate the pulley 9, without, however. operating the driven unit, because, as seen in Figures 3 and 4, the wheel 1 that is the unit, is maintained in concentric relationship with the driving pulley by the spring 43.

This positioning of the driven unit is obtained by vertical adjustment of the hanger 27 on the base lug 30, and by adjusting the brake lever 36 on the brake arm 29 as aforesaid.

hen the pulleys 15-16 are to be rotated to drive the belt 17, the treadle rod 26 is moved downwardly, whereby the hanger 21 through the operating arm 25 is swung downwardly and to the left in Figure 2 to move the wheel 12 into contact with the mo tor pulley 9 and away from contact with the brake shoe, when of course, the pulley 9 will drive the wheel 12 by frictional engagement and also rotate the pulley 15-- or 16 to drive the belt which transmits the power to the machinery, a sewing machine for instance, on the bench 45.

It Wlll'b noted that the entire mechanism may be manufactured and shipped as a unit ready to be attached to the work bench. The device is compact, easily assembled, is very sturdy in construction and easily adjusted. Then the operator lets go of the treadle the spring 43 instantly operates to move the wheel -12into contact with the brake shoe to stop rotation of the wheel.

I claim 1. Aself contained unitary power transmitting mechanism comprising in combination a base, a motor secured thereto, a drivingwheel operated by said motor, a driving unit adapted to be operated by said driving wheel, a hanger for-supporting said unit, a yoke for pivotally supporting said hanger, means for adjustably supporting'said yoke on the said base, means carried by said yoke for automatically normally maintaining said hanger and driving unit'in non-operative relation with said driving wheel and means for operatively engaging said driving wheel and unit.

2. A self contained unitary power transin normalnon-operative relationship and si-' multaneously therewith maintaining said driving unit in contact with the said brake and means for operatively engaging said driving unit and wheel.

3. 'A self contained unitary power'tran'smitting mechanism. including in combination a driving unit and a. driven unit, which lattercomprises rigid supporting means, a

brake secured thereto, a hanger pivoted on said rigid supporting'means, a shaft in said" hanger," a pulley' on' said'shaft, means on said rigid supporting means for maintaining said pulley in contact with the said brake means for moving said pulley away from said brake and into operative relationship with the said driving unit and means for securing the said driving unit to the said rigid supporting means.

4. In combination a base, a yoke adjustably mounted thereon, a brake member adjustably mounted on said yoke, a driving unit pivoted in the latter and provided With a pulley having an interior driving surface, a motor secured to the said base, a driving Wheel operated by said motor and adapted &

to engage the said driving surface on the pulley, a spring for maintaining the said pulley in non-operative concentric relationship With the said Wheel and in contact with the saidbrake member and means for operating said pulley into driving relationship with the said Wheel.

Signed at 245 Seventh Ave, in the county 20 of New York and State of New York this 2nd day of June A. D. 1922.

MICHAEL MCCANN.

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