US991359A - Automatic reversible gearing. - Google Patents

Description

O. G. PFEIFFER.

AUTOMATIC REVERSIBLE GEARING.

APPLICATION FILED JUNE 22,1909.

Patented May 2, 1911.

\ 2 SHEBTS-BHEET 1.

0. G. PFBIPFER.

AUTOMATIC REVERSIBLE GEARING.

APPLICATION FILED JUNEZZ, 1909.

Patented May 2, 1911.

2 SHEETSSHEET 2.

Witness 0 flaw UNITED S.TATE S PATENT OFFICE.

OTTO G. PFEIFFEB, 0F SALT LAKE CITY, UTAH, ASSIGNOB, BY MESNE ASSIGNMENTS,

TO UTAHNA DEVELOPMENT COMPANY,

TION OF UTAH.

OF SALT LAKE CITY, UTAH, CORPORA- AUTOMATIC REVERSIBLE 'GEABING.

Specificationof Letters Patent.

Patented May 2, 1911-.

Application filed June 22, 1909. Serial No. 508,689.

To all whom it may concern:

Be it known that I, O'r'ro G. PFEIFFER." citizen of the United States, residing at Salt Lake City, in the county of Saltlmke and State of Utah, have invented certain new and useful Improvements in Automatic Reversible Gearing, of which the following is a s ecifi'cation.

This invention relates to gearing whereby a driven shaft is rotated in one direction for a certain number of revolutions and is then shifted so that it shall be rotated in a reverse direction for a predetermined number of revolutions, and the invention particularly relates to a construction of this character wherein the automatic mechanism may be so set that the driven shaft will make one to thirty or more revolutions before being reversed in its movement. I

\Vhile my mechanism is adapted to be used in any -machinewhere reversible motion is necessary vet it is peculiarly adapted for-washing mac ines, wherein the washing dru'm revolves in one direction for a predetermined period and is then automatically reversed in direction. .This is usually accomplished by means of counter-shafti'ng, pulleys, belts and running ears.

In the accompanying rawings I have shown my automatic reversing mechanism disconnected from the washing .machine but applied to the shaft-thereof, Therein,

f igure 1 is a longitudinal section of my improved reversing, gear supported on the extremity of a sha t. Fig. 2 IS a section'on the line 22 of Fig. 1. Fig. 3 is a perspec' tive detail View of-the u per portion of the shaft a pair of to le lhvers thereom'and the siiding lates. '4 is a plan view of the reversib edisk wi fii its adjustable pins. Fig. 5 is-a planview of the yoke whereby the shifting collar is held Fig-6 is an end view of the shaft showin the cam track,

and Fig. 7 isa sideelev-ationthereof. Fig. i

.manner as the band transmitted tron-i the wheel (i-to't-he disk or :their other ends and inserted into this to the disk 12. 'It will the main driven shaft. of a or other casing, and actuating therein a series of paddles or other suitable Washing mechanism. bearings?) which in turn are supported by standards 4 of any suitablecharacter. Rigidly mounted on the standards 4 or in any desired manner, is a casting 5 which acts as a support and inclosure for the mechanism now to be described and acts also as a means of supporting the outer end of the shaft 2 as will be later referred to.

Looselmounted on the shaft '2 is the band pu ley 6 whose hub 7 revolves loosely on the shaft 2 against a thrust collar 8 held in place by a set-nut 9. Between the end of the hub and the face of the thrust collar 8 are placed the anti-friction" balls 10. The shaft 2 is of course shouldered at 11 so that the band pulley 6 is held in place on the shaft and prevented from any-radial move ment thereon after the thrust collar and set-- nut are in place.

Opposed to the'bandpulley 6f is-the friction disk 12 which also -revolves upon ;the shaft 2 and is held in lace by a shoulder formed on the shaft an b the thrust balls 10 and set-nut 9. This dis 12 also revolves freely upon the shaftin reoisely the same pul ey 6'. Motion is wheel 12 by means of roller pinions 13 which are located between the two wheels and which are supported on stub shafts 14 carried on an inwardly'proj-ecting ring or lugs 15 on the castinginwardly projecti'n 5. These stub she s are screwthreaded at the ring or 111 15, the opposite end of the shaft be ing .7 ouldered. The transmitting pinions in the form shown in the drawings consist of op osed disks carryi between them the an'ti-f i'ictionrollers 16. do not wish to be limited to this as it is obvious that I miilt use any form of transmitting inion tween the-two disks 6 and 12. ere are as many of these transmitting pinions as 'may (1' be desired.

The wheel or disk 6 is provided at its circumference with the pulley face 17 whereby power is'transmitted to the disk G and from be obvionsthat the disk 12 willrevolve reversely to' the diskv '6. My mechanism is so arranged that the movement of either one of the wheels or Said shaft 2 issupported in disks 6 or 12 may be transmittedto.,,the-sliaft 2 so as to accomplish a reverse movement of the shaft. Generally speakin the means whereby the movement of the isks 6 or 12 is transmitted tothe shaft consists of opposed fr ction disks 18 and 19, which are practically splined upon the shaft but may be force outward against one or the other of the disks 6 or 12 so as to frict anally en-. gage the same. The circumferrnce of each of the disks l8 and 19 is beveled to engage with a beveled friction ring 20, set in an annular groove in the inner face of each of the disks. This friction ring is adjustable inwardly or outwardly by means of screws 21 so as to take up wear, or provide for more or less frictional engagement between the friction disks and the adjacent driving wheels 6 and 12.

Between the disks 18 .and 19 the shaft is square in section and on the side are mounted the slide plates 22. The shaft 2 is slotted and a transverse two-part bolt 23 passes diametrically through the shaft and the ends of the bolt sections pass through the slide plates and are held by nuts 23 (see Fig. 2). The opposed side faces of the shaft are slotted as at 24 and therein are-located the opposed sets of toggle levers 25 each composed of a pair of links pivotally connected to a common pivot bolt 24* at their inner ends, the. extremity of the outer link of each set of toggle levers being connected to slidingv plates 26 which are shouldered at 26" to receive the plates 18 and- 19. The toggle levers are of such length that when one pair are flat, the other pair are at an angle to each other, as shown in Fig. 1. Thus the meeting ends of one pair of toggle levers project up beyond the slot 24 while the other pair of toggle levers lie flat in the bottom of the slot. The opposed slide plates 22 carry at their upper and lower ends the transverse pins 28 which carry upon them the rollers 28 and the spacing sections or sleeves 29. The rollers 28 are located. in alinement with the slot 24 and the rollers project down slightly into the slot so that as the sliding plates are moved transversely across the space between the friction disks 18 and 19, he rollers will depress one set of toggle levers thereby lifting the other set of toggle levers. This depressionof one set of toggle levers and the consequent elevation of the opposed set forces one of the disks 18 or 19 against its adjacent friction wheel or disk 6 or 12 and retracts the opposed disk 18 or 19 from the adjacent friction wheel. -Thus the ower transmitted from the pulley-'6, will be delivered to one or the other of the friction disks 18 or- 19 and from'this friction disk to the shaft, .de ending upon the movement of the slide 'p ates 22, to one side or the other longitudinally of the shaft. Preferably the inside links' of -each pair of toggle levers has. a projecting stud or extension 26 against which the rollers on the slide plates contact to depress the toggles.

As a means of shifting the slide plates with their rollers, I form the end of the shaft 2 tubular or hollow and provide therein the longitudinally shiftable rod 30. This rod pro ects beyond the shaft at one end and its inner end extends into the shaft sufficiently far that its head 31 is beneath the space between the disks 18 and 19. This enlarged ':fld 31 engages with the bolt sections 23, as shown in Fig. 2, so that the reciprocations of the shaft 30 will reciprocate the slide plates 22. Preferably, I interpose between the rod 30 and the inner face of the shaft, the bushing or lining tube 32 which however terminates a distance sufficiently short of. the head 31 to permit the rod 30 to be shifted a proper distance to move the' slide plat-es 22 i.) one direction or the other, to operate the toggle levers. The casing 5 carries upon it the bearing 33 which surrounds the shaft 2 between the disk 12 and the extremity of the shaft and supports the, extremity of the shaft.

It will be seen from the above description that a reciprocation of the rod 30 from one side to the other will cause the motion of the pulley 6 to be transmitted in either direction 'to the shaft 2. In one case the shaft 2 will-move in the direction of the pulley, in the other, the motion of the pulley will be communicated-indirectly, by the disk 12 which revolving in.an opposite direction to the disk or pulley 6 will revolve the shaft in an opposite direction. As a means of causing an automatic reciprocation of this rod 30 I provide upon the extremity of the rod the opposed cones 35 and 36. of a ball-bearing, these cones being of course channeled to form raceways for,the anti-friction balls 37. The extremity of the rod 30, is screw-threaded and carries u on it the nut 38 which holds in place a was er 39 which engagesv the cones 35 and 36 to hold them in place upon the shaft and against the extremity of the sleeve 32. The rod 30 and the shaft of course revolve together. Surrounding the opposed cones35 and 36. is the shaft collar 40 which is formed oh .its interior with the annular rib 41 forming the dividin web between the two race-ways forthe. bals 37. The collar 40 is split or slotted longitudinally on its under side as at 42, =the inner wall of this slot being inclined as at 43..- .Mounted within this slot in the collar 40 is the radially- 'movable pivoted arm 44. This is pivoted at its outer end between the walls of the slot' and its inner face is inclined or' beveled-to abut against the beveled or inclined wall 43.

of the slot. This arm extends inwardly be-.I yond the side face of the collar andis there provided with a pin 4?) carrying the roller 46. The inner face ofthe arm 44 formed with a recess 47 which alines with a recess 4!? in the outer face of the collar 40. A,"

pin 49 is locatedi in this recess and sur rounded' by a spring 50 which acts to force the pin outwar e pin is provided with a head 51 having inwardly beveled faces sothat the sad is V-shaped in cross-section, the axis of the head extending parallel! to the axis of the shaft.

, The upper face of the collar is formed with an upwardly extending pin 53 which provides means whereby the collar may be reciprocated: by hand, to change the direction of motion of the parts when desired.

This pin 53 is normally held to revent the collar from turning b 1 means 0 a yoke 54 which is in the form 0 an arm extending out from and attached to the casting 5. This yoke at its extremity is slotted as at 55, the slot at its rear portion being sufficiently wide to. permit a movement of the pin 52 longitudinally ,alon tion of movement 0 the rod: 30, thus permitting the pin and collar 40 to be reciprocated in-order tochange the motionas above described. The. slot 55 in the yoke, however, is narrowed at its forward edge, so that when the collar is rotated and thepin placed within this narrowed portion it will be prevented fromany longitudinal reciprocation, and thus thecollar will be held in place. A gate 56 having the form of an arm pivoted at its-rear end to the yoke and closing across the slot prevents the .pin .53 from laterally moving when placed within the narrow portion of the slot. \Thus,;, as long as the gate is closed andkthepin in the widened portion of the slot 54 thepin can only move lon itudinally. When, however, it is placed in t e narrowed portion of the" slot and the gate closed, the pin and collar cannot reciprocate nor'can the pin inove out of lace.

Located beneaththe shaft 2 and-t e collar 40 is the venticalbearing- 60, supporting the disk 61 which is rotatablein a horizontal planet this diskbeing formed with the swindle 62 which enters the bearing The hearing may be supported in any convenient manner, but preferably, as shown, forms a part of the casting 5i projecting pins 63 forming teeth which are 9 engaged by atappet pin 64 projecting from a disk 65 or collar which is keyed fast to the shaft 2 just forward of the disk 12' The disk 61' to rotate a certain distance, and that each time in the course of its revolution that the pin 64' strikes one of thepins 63th:: disk the yoke, in the direc tion. The circumference of this disk 61- is provided with a seriesof 61? will be correspondingly rotated. Thus a: step lty-step intermittent rotative movement is secured for the disk 61. The face of this disk as shown in' Fig. 4: is provided with: a plurality of radially arranged holes, placed in two series. Placed in an one of these two series of holes are the a justable headed pins 67 and v 68. lhe heads of these pins are oppositely beveled so as to be \fi-sha ed in section in the manner previously 'd escri ed for-thehead of pin 49, and these heads are arran ed with their axes at right angles to the direction ofrotation of the shaft 62-.- Thus it will be obvious that in vthe rotation of the disk 61 one of the heads 66 or 67: will: contact with the head of the pin 49, and that when this contact takes'place thele'ver 44- will he lifted to the position shown in Fig. 1, and held there until the two heads have passed each'other, whereupon the lever will, dro Which of these pins 66 or 67 the he contacts with, depends uponv the position of the collar 40 and the shifting of this collar depends upon the automatic cam mechanism now to be described:

It will be obvious that if the shaft were provided wit-ha cam rib or cam slot extending spirally around the face of the shaft diagonah to the axis thereof with which thercll'er 46. was in constant engagement, that the roller following the cam trackwould give the collar 40 and the rod 30 a complete 7 cause a complete reciprocation at eachrevolution but to shift the rod 30 in one direction, then allow it to remainin shifted position for a comparatively lengthy period and then; again reversely shift the rod and allow it to again remain so shifted for another predetermined interval. Thus it is necessary that the-roller 46 shall move along the cam track to: a: position wherein the rod 30 has been completely shifted, and thatthen the roller shall be moved out of its engagement with the cam track for a predetermined length of time until which period therod 30 remains shifted and that then the roller 46 shalljbe again engaged with the cam :cam 70 which are extended at right an les to the axis of the shaft, these shoul 'ers gradually rising toward the middle of the cam rib 70 and then merging into-the rib.

head of the pin 51 on lever 44 coming in contact with the'head of either pin 67 or 68, then it will engage with one or the other face'of the camrib and be moved in one or the other direction. The roller'is lowered from its engagement with the cam rib at the limit of its path of travel. Thus when the rod 30 has been fully moved in either direction, the roller is lowered from its engagement with the cam track, and the rod 30 and the mechanism connected therewith remains stationary until the roller is again raised by the head 51 coming in headed pins 67 or 68.

Tlfe operation of myinvention is as follows: Let it be assumed that the parts are in the position asshown in Fig. 1, that is, that the friction disk 18 is in engagement with the web 6 of the driving pulley. Under these circumstances the rod 30 will be drawn inward as far as it will go. The collar 40 will also be drawn inward, as far as itwill go, and the roller 46 will also be at the limit of its movement i-n an inward direction. Of course the friction, disk 12 will be constantly revolved in an opposite direct-ion to the disk or pulley 6, by the roller pinions 13. That set of toggle levers which are adjacent to the disk '19 will be flexed or inclined with each other as shown in the drawings. The disk 61 as before stated carries upon it the two headed pins 66 and 67, the pin 66 being inward of the pin 67. There are two series of holes 65 and each of the heads 66 or 67 is provided with two pins entering the two holes of each series so that the heads shall in "turn be held in rigid radial position. It'will be obvious, however, that those holes might be square for the same purpose. The heads 66 contact with the and 67 will, one or the other, oomein contact with the head of the pin 49 depending upon whether the collar 40'is moved to its limit in one direction or the other. In Fig. l, the collar is of course at its inward limit of motion and hence the head 51 ofthe pin 49 will come in contact with the head of the pin.66. Upon the incidence of the head of pin 66 with the head of pin 49 the lever 44 will be raised, thereby raising the 'roller. 46 which will come.in contact with the outer face of the cam rib. As the shaft rotates, therefore, the roller contacting withthe outer face of the cam rib will belforcedoutward, thus moving the collar 40 outward which through its anti-friction bearing on the cones 35 and 36,.will move the rod 30 gutward. Upon the movement of the rod 30 the slides 22 will be likewise shifted toward the friction disk 19 and, the rollers carried on the slide will depress the prothis shifting of enga ement of course the shaft will be reverse y rotated, the bevel v faces of the friction disks 18 and 19 and in the reverse direction.

the bevel faces-of the rings 20 making a gradual frictional contact between the two, which will permit the gradual engagement of the two members and thus gradually check the mot-ion of the shaft in one direction and frictionally engage it for motion There is thus 'no jar or shock upon the change of gear. To return to the movement of the roller. .45

' along the cam track it will be seen that the roller will be moved along the outer face of the cam rib 71, thus moving outwardly the collar 40 and the rod 30 as above described. When the roller reaches the limit of its-outward movement, the disk 61 will be given rotation through a small arc of a- A circle bythe pin 64 and'the head 66 will pass from its registering position withthe head 49, thus permitting the arm 44 to drop. The roller will now be alisengaged from the cam track and hence the collar 40, the rod .30'

again into registry with the pin 49 whereupon this (pin will be raised, raising up the arm- 44 an bringing the collar 46 intocontact with the inner face of the cam rib, which will cause the rollerto move inward or toward the friction clutches until it again reaches its innermost position, thus reversing the mechanism to the position shown in Fig. 1.

At this point the two heads 49 and 67 will 7 shift from engagement with each other whereupon the lever will drop, the roller 46.be moved'out of engagement with the cam track 72 and the mechanism revolve in the direction first explained, until the headed pin 66 again comes incontact with the of the headed pins 66 and 67. Thus in headed pin'49,

It will be obvious that the number of rotations which the shaft 2 will perform. be-

forea shifting of'the clutch disks 18and 19 and a change of direction ofrotation of the shaft, will depend upon the distance a art 1 4, these pins are shown as bein near y coincidentwith other. There wil be as many step. by step movements of the disk 61 before the heads 66 or 67 register with the head 49 as there are radial series of holes. Obviously if the vhead 66 is placed diametrically opposite to the head 67 there will only be about half as many IGVOlIIiJOHS of the shaft before the heads 66 or 67 will register with the head 49 and the reverse movement of the clutch disks takes place as there would be if the heads 66 are nearly coincident with each other.

My invention is particularly applicable to washing machines of that character wherein the drum or mechanism connected with the drum is revolved in one direction for a certain length of time and then revdlved in the opposite direction. It will be seenthat my arrangement of elements when attached to the shaft of a washing machine provides for a reverse motion of the shaft at predetermined intervals and that this reverse motion takes place with an easy start and stop which is so necessary in the actuation of washing machine drums or like mechanlsm. p

Having described my invention, what I claim is 1. In mechanism of the class described, driving elements rotatable in reverse directions, a driven shaft, shiftable clutch mechanism-connected with the shaft and adapted to be engaged with either of the driving elements to reverse the motion of the shaft, a shifting rod for actuatin the clutch mechanism, and means actuate by the rotation of the shaft to shift the rod longitudinally after a predetermined number of revolutions in one direction, and then after another predetermined number of revolutions reverse the motion of such rod.

2. In mechanism of the 'class' described, driving elements rotatable in reverse directions, a driven shaft, clutch mechanism connected to the shaft and adapted to be engaged with either of the drivin elements to reverse the motion of the sha t, a shifting rod connected to the clutch mechanism, a revolving cam with which said rod is engaged to shift the latter alternately in opposite directions, and means acting after each shifting of the rod by the cam in one direction to disconnect said rod from the cam and hold it disconnected therefrom during a predetermined time.

3. In mechanism of the class described, driving elements rotatable in reverse directions, a driven shaft, clutch mechanism connected with the shaft and adapted to be enga ed with either of the driving elements, a shi ting rod connected to the clutch mechanism to shift the same, a revolving cam with which the rod is en aged to shift the latter, and means actuated by the rotation of the shaft and actuated after each shifting of the rod by the cam in one direction, for disconnecting saidrod from the cam and holding it disconnected therefrom during a predetermined time.

4. In mechanism of the class described,

driving elements rotatable in either direction, a driven shaft, clutch mechanism connected to the shaft and adapted to be en'- ga ed with either of the drivlng elements, a

shifting rod connected with the clutch mechanism, a revolving cam with which the shifting rod is connected and by which it is shifted, a rotatable disk, mechanism for rotating said disk by the rotation of the shaft andadjustable means carried on said disk nism, a revolving cam by which said rod is adapted to be shifted, a rotatable disk, means for rotating said disk from the shaft at a slower speed than the shaft, and means carried by the disk for connecting said shifting rod to the cam when the disk has reached a certain predetermined point in itsmovement to permit the cam to shift the rod and then permit the disconnection of the cam rod for another tion of said disk.

6. In mechanism of the class described, -100 driving elements rotatable in reverse directlons, a driven shaft, clutch mechanism connected wlth the shaft and adapted to be enpredetermined period of rotaraged with either of the driving elements, a

s rod connected to the clutch mechanism," a revolving cam, a rotatable disk,

. means for transmittin the continuous rotative movement of the s aft'into an intermittent rotative movement of the disk, and means carried by the disk and adjustable to a certain point on the face thereof for connecting the said rod with the cam, which means after passing the said point permits a the rod to be disconnected from the cam.

7. In mechanism of the class described, driving elements rotatable in reyerse directions, a driven shaft, a shiftable clutch mechanism connected to the shaft and adapted to be engaged with, either of the driving elements, a shifting rod connected to the clutch mechanism, a collar on the rod, nonrotatable therewith and shiftable with the rod, an arm pivoted to the, collar and carryin a roller, a cam continuously rotatable with which said roller may be en aged when the arm is in one position, sai cam actin' to shift the roller and the rod 1on from, and after a predetermined period to again lift said cam and roller into engagement with the cam to shift the chm and rod.

8. In mechanism of the class described, driving elements rotatable in reverse direc tion, a driven shaft, clutch mechanism connected to the shaft and adapted to be engaged with either of the driving elements, a

1G shifting rod connected to the clutch mechanism, aco'llar surrounding the shifting rod and longitudinally movable but not rotatable therewith, an arm pivoted to the collar and carryinga roller at one end, a cam with which'said roller may be engaged whereby the shifting rod may. be moved from one position to another, a rotatable disk, means on the shaft for giving to the disk an intermittent step-by-step rotation, said disk being 20. provide upon its face with two series of perforations, headed ins adjustable in the,

perforations of the disk to positions nearer to or farther from each other around the disk, the inclined faces of said pinsengaging with said arm to raise it and bring the roller intoengagement with the cam, and

the space between the headed pins permit ting said arm to fall and be disengaged from the cam. b

In mechanism of theclass described, driving elements rotatable in reverse directions, a driven. shaft, clutch mechanism con nected to the shaft and adapted to be engaged with either of the driving elements, a

3 shifting rod connected to the clutch mechanism, a collar on the extremity of the shifting rod longitudinally shiftable but nonrotatable therewith, an armpivoted 'on the collar and carrying a roller at one end, a

40 cam carried by the shaft with which said roller may be engaged to shift the arm, the collar and the shifting rod in one or another direction, and means actuated by the rotation of the shaft and acting after each shifting of the rod by the cam in'one direction to disconnect said roller from the cam, hold it disconnected therefrom during a predetermined number of revolutions of the shaft and then I again engagmtheroller with said cam to re-' versely shift said rod.

10. In mechanism of the class. described, driving elements rotatable in reverse directions, a driven shaft, clutch mechanism connected to theshaft and adapted to be engaged with either of the driving elements," a shifting rod connected to the clutch mechanism, a cam track arranged on the endof the shaft, a collar onthe extremity of the shaft connected to the shifting rod to shift the'same, an arm nivotedin the collar and carrying on one end a\ roller engageable with thecam track on the end of the shaft.

a rotatable disk mounted upon the shaft, and

having a double series of perforations in its .65 upper face," 'opposed'pins having heads tri-' "pins projecting from the circumference of the disk and adapted to be engaged successively by the tappet arm as the shaft is rotated, to rotate the disk with a step-by-step movement, a sprin acting to force the arm on the collar away from the cam track, and .a headed pin projecting from the said arm into the path of movement of the headed pins on the disk and adapted to be engaged and raised by the same in a registering position to carry the roller on the end of said arm into engagement with the cam track.

11. In mechanism of the character described, driving elements rotatable in-reverse directions, a driven shaft, a clutch mechanism connected to the shaft and adapted to be engaged with either of the'driving ele ments, a shifting rod connected to the clutch mechanism, a spiral cam track extending around half ofthe face of the shaft, a collar on the end of the shifting rod longitudinally movable therewith but not rotatable, means for holding the collar from rotation, an arm pivoted in said collar extending rearward therefrom and having a roller engageable with the cam track, and means rotatable by the shaft and with the same adapted to move said roller into engagement with the cam track at one point in the revolution of said means, and then allow the said roller to be carried out of engagement with the cam track during the remainder of said revolution.

12. In mechanism of the class described, driving elements rotatable in reverse directions, a driven shaft, clutch mechanism connected to the shaft and adapted to engage with either of the driving elements, a shiftadapted to be inserted in any hole of the double series of'holes and engageable during the rotation of the disk to engage said shifting rod operating means with the cam track for movement in one or the other direction by said track.

. 13. In mechanism of the class described.

a driven shaft, a driving pulley loose on said shaft, a friction disk opposed to said driving pulley and loose on the shaft, pinions arranged between the pulley and the friction disk and communicating motion from one to the. other, opposed friction disks mounted on the shaft and longitudinally movable along the shaft to be forced into frictional engagementwith either the pulley or the first named friction disk, a shifting rod extending through the shaft, mechanism actuated by 14. In mechanism of the class described, a

driven shaft, drivin elements loose on said shaft, both of said e ements having the form of disks and one being formed as a'driving pulley, inions mounted to engage the inner faces 0 both of these driving elements to rotate-one reversely to theother, longitudinally shiftable friction disks mounted on the shaft and longitudinally movable thereon into, or out of engagement with one or the other of the driving elements, opposed pairs of toggle levers mounted between the friction disks and so arranged that when one toggle lever of a pair is flexed the other shall be straight, slide plates on eitherside of said shaft and longitudinally movable with relation thereto, rollers carried by the slide plates and engagin with the togglelevers to flex one or the ot er thereof, a shifting rod connected at its end to said slide plates, the said rod extending through said shaft, and extending beyond the same, a collar mounted on the end of the rod but not rotatable therewith, an arm on the collar, a cam track on the 'extremity of the shaft with which said arm OTTO e. PFEIFFER. 1). 5.

Witnesses Tnno. BOSSARD, Errm HILL.

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