US758561A - Speed-changing mechanism. - Google Patents

Description

No. 758,561. 7 I PATENTED APR. 26, 1904.

G. J. REED.

SPEED CHANGING MECHANISM.

, APPLIOATION FILED DBO. 2. 1903. no MODEL. f 4 snnnTssnnn'r-1.

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PATENT-ED" APR. 26, 1904.

' 0. J; REED. SPEED CHANGING MECHANISM.

APPLICATION. FILED DBO. 2. 1903.

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NO MODEL- PA'TENTED APR. 2-6 1904.

' G. J; REED. SPEED CHANGING MECHANISM.

APPLIOATION FILED DEC. 2. 1903.

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No. 758,561. I PATENTBD APR.26,1904.

c. 'J. REED. SPEED CHANGING MECHANISM.

APPLIOATIOK FILED D110. 2, 1903.

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a 7 7 muzz UNITED STATES Patented April 26, 1904.

PATENT OFFICE.

SPEED-CHANGING MECHANISM.

SPECIFICATION formingpart of Letters Patent No. 758,561, dated April 26, 1904. I

Application filed December 2, 1903. Serial No. 183,495. (No model.)

To all w/wm, it may concern:

Be it known that I, CHARLES J. REED, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Speed-Changing Mechanism, of which the following is a specification.

This invention is a mechanism for transmitting power from a driving to a driven shaft and enabling the speed of the driven shaft to be varied'with reference to that of the driving-shaft.

The mechanism comprises a double pulley which is placed between and belted to pulleys on the driving and the driven shafts. The double pulley has two drums, each consisting of a set of radially-adjustable rim-sections, and means for simultaneously moving either set of rim sections inwardly and the other outwardly, thereby contracting one drum and expanding the other. The shaft of the double pulley is supported on movable bearings, preferably carried by rock-arms, to compensate for changes in the working length of the belts by which it receives and transmits power.

Referring to the accompanying drawings, Figure 1 is an end elevation of the mechanism. Fig. 2 is a side elevation of the double pulley and its supports. Fig. 3 is a plan view of the double pulley with the parts at one side of a vertical axial plane in horizontal axial section. Fig. 4: is a transverse vertical section of the double pulley on the line TV IV of Fig. 3 with tional view of the clutch mechanism for looking the movable parts of the pulley to the shaft. Fig. 6 is a detail perspective View of one of the rim-sections. Fig. 7 is a vertical axial section of a modified construction. Fig. 8 is a side elevation, partly in vertical axial section, of a second modification. Fig. 9 is a transverse vertical section on the line 1X IX of Fig. 8. Fig. 10 is a plan view of a triple pulley for transmitting power from either of two belts running in opposite directions on the outer drums, the sections of which move inwardly and outwardly in unison; and Fig. 11 is an end elevation showing two of the double pulleys interposed in series between the driving and the driven shaft and themselves belted together, so as to increase the ratio of speed transformation.

Referring now to Figs. 1 to 6, the driving-- pulley 1 and the driven pulley 2 are connected to the two drums of the intermediate pulley 5 by the belts 8 and 4:, respectively. The double pulley is carried by'a shaft 6, j ournaled in bearings at the upper ends of rock-arms 7, which are keyed on a rock-shaft 8, journaled in fixed bearings 63 63. The double pulley comprises three rim-section-adjusting disks 9 1O 11, which are fixed on the shaft 6 by keys 12. The disks 9 and 10 are spaced apart to receive between them one set of rim-sections, and the disks 10 and 11 are spaced apart to receive betweenthem the other set of rim-sections. The

disks 9 and 10 have in their opposing faces parallel spiral grooves 13. The-grooves in the disks 9 and 11 are cut in a contra-clockwise or left-handed direction from the center to the circumference. T hegrooves 13 on both faces of the disk 10 are cut in a clockwise or righthanded direction from the center to the circumference.

Between and closely adjacent to the grooved faces of the adjusting-disks are the rim-section-guiding plates 1415 16 17. The plate 14: has a peripheral flange 141', which surrounds the edge of the adjusting-disk 9. The plates 15 16 have peripheral flanges 15 16', which are bolted together. The plate 17 has a peripheral flange 17, which is bolted to the corresponding flange 18 of a plate 18, which lies outside the adjusting-disk 11. The plates 14 15 are rigidly secured on the ends of a sleeve 19, which is revolubly supported on the pulley-shaft 6 between the adjusting-disks 9 10. The plates 16' 17. are rigidly secured on the endsof a sleeve 20, which is revolubly supported on the shaft 6 between the adjustingdiskslO 11. The inner edge of the plate 18 is secured to a combined gear and clutch member 21, which is revolubly supported on the shaft 6. Each of the plates 14 15 16 17 has a circular series of substantially radial equidistant slots 22, which receive and guide the ends of the rim-sections 23. Flanged support-collars 19 20, having radially slotted recesses registering with the guiding-slots 22,

are preferably secured to the respective sleeves 19 and to the guiding-plates.

Each of the rim-sections (shown in detail in Fig. 6) comprises a straight bar 24, having at each end teeth 25, which are shaped to enter the spiral grooves 13 of the adjusting-disks. The belt-receiving portion of each rim-section is a broader piece 26, having flanges 26, which receive the bar 24 and are secured thereto by a rivet 27. The rim-sections are so constructed that the bearing-surfaces of the sections of each set are equidistant from the axis of the pulley-shaft, notwithstanding the fact that each successive section enters the spiral groove at a somewhat greater distance from the center than the preceding section. This result may be effected either by cutting the teeth in different positions on each section of the set or by seating the bearing-surfaces 26 of each set in recesses of different depths in the various section-bars 24.

It will be seen that the five plates 14 15 16 17 18 are rigidly connected together by the sleeve 19, flanges 15 16', sleeve 20, and flanges 17' 18, so that rotation of the plate 18 by the gear member 21 causes each of the guidingplates to rotate, on the pulley-shaft and with reference to the adjusting-disks, which are keyed to this shaft. The teeth of the rimsections are by this rotation moved spirally in the several grooves 13 and radially in the guiding-slots 22. The rim-sections constituting one pulley-drum are thereby moved inwardly, decreasing the diameter of the drum, and the rim-sections of the other set are simultaneously moved outwardly, thereby increasing the diameter of the other drum.

' The guiding-plates are rotated with reference to the adjusting-disks or locked to the pulley-shaft when the rim-sections have been properly adjusted by the gear mechanism. (Shown at the right-hand end of the pulleyshaft in Figs. 2 and 3.) The gear member 21, which carries the plate 18, has external gearteeth 29 and internal clutch teeth 30. A clutch member 31, adjacent to the gear member 20, is arranged to slide on the shaft 6, but is splined thereto by a feather 32 and has clutch-teeth 33 in position to engage with the teeth of the member 21. The clutch member 31 also has a beveled collar 34, by which the clutch-teeth are disengaged. A double gear 35 is fixed on the shaft 6 at the end of the clutch member 31 by a key 36. This gear has two sets of teeth 37 38, which differ in number, but are of the same pitch. For example, there may be eighteen teeth 37 and sixteen teeth 38. The double gear 35 has a recess 39, containing a helical spring 40, which normally forces the movable clutch member 31 into engagement with the gear and clutch member 21, thereby locking the set of guiding-plates to theshaft through the feather 32. A speedcontrol lever 41 is journaled on the rock-shaft 8, being held in position by the set-collar 42.

The upper end of this lever has a yoke 43, which surrounds the pulley-shaft 6, and a handle 44. Stub-shafts 45 46 are rigidly secured at each end of the lever-yoke 43. J ournaled on the shaft 45 is a member 47, which has a beveled collar 48 in position to bear against the beveled collar 34 of the clutch member 31, a set of gear-teeth 49 in position to mesh with the teeth 37 of the double gear 35, and another setof gear-teeth 50 in position to mesh with the gear-teeth 29 of the gear and clutch member 21. J ournaled on the shaft 46 is a member 51, which has a beveled collar 52 in position to bear against the beveled collar 34 of the clutch member 31, a set of gearteeth 53 in position to mesh with the teeth 38 of the double gear 35, and another set of gearteeth 54 in position to mesh with the gearteeth 29 of the member 21. The teeth 29, 50, and 54 are preferably of equal number. For example, there may be seventeen in each set. The teeth 49 and 53 ditfer in number, but are of the same pitch. For example, there may be sixteen teeth 49 and eighteen teeth 53. Friction-gears having corresponding diameters may be substituted for the toothed gears.

When the rim-sections are adjusted to the position shown in Figs. 1, 2, and 3, the driven pulley 2 will run at the minimum rate of speed. If it be desired to increase this speed, the control-lever 41 is thrown toward the driven pulley 2. The beveled collar 52 is thereby forced against the beveled clutch-cob lar 34, forcing the clutch member 31 to the right and unlocking the member 21 and the guiding-plates from the pulley-shaft. The gear- teeth 53 and 54 are immediately thereafter thrown into mesh with the gear- teeth 38 and 29. There being, for example, sixteen teeth 38 and eighteen teeth 53, while the teeth 54 and 29 are equal in number, the gear member 51 will be set in rotation on its shaft 46 in the opposite direction to and with a speed eight-ninths that of the pulley-shaft 6, and the gear member 21 will thereby be set in rota-' tion on the pulley-shaft in the same direction as and with a speed but eight-ninths that of the pulley-shaft-that is, the member 21 will make but eight complete clockwise rotations while the pulley-shaft is making nine complete clockwise rotations. The member 21 and the rimsection-guiding plates are thereby given a slow contra-clockwise rotation with reference to the pulley-shaft and the adjusting-disks keyed thereon, thus forcing inwardly the rimsections of the right-hand drum and forcing outwardly the rim-sections of the left-hand drum.

The corresponding change in the working length of the belts 3 and 4 is automatically compensated for by the movement of the pulley-shaft and its bearings, carried by the rockarms 7. When the speed of the driven shaft has thus been raised to the desired point, the control-lever is again thrown to a central po- 1 of the driven shaft.

sition with reference to the pulley-shaft, disengaging the gear-teeth and allowing the teeth control-lever away from the driven shaft, by

reason of the fact that there are then, for example, butsixteen teeth 49 in mesh with eighteen teeth 37, while there are still seventeen teeth 50 in mesh with the seventeen teeth 29.

To normally hold. the'control-lever in inoperative position, it is provided with a lug 55, in which reciprocates a pin 56, having at its upper end a tooth 57. This pin is normally forced upward by a coiled spring 58, so that its tooth lies between two teeth 59 60, which depend from the end of an arm 61, carried by the adjacent rock-arm 7. When the controllever is thrown toward or from the driven shaft, the spring-tooth 57 rides over the tooth 60 or 59, and when the speed has been properly adjusted and the control-lever is thrown back the spring-tooth is again received between the teeth 59 60. The spring-tooth 57 may be held out of engagement with the teeth 59 6O by'means of the set-screw 62 in the lug 55.

In order to throw the control-lever to a central or inoperative position when the rim-sections have been carried to their limiting position at either end of the spiral grooves, and

thereby prevent injury .to the pulley mechanism, adjustable stops 66 67, shown as setscrews, are arranged in arms 64 65, which project at either side of the bearing 63 of the rock-shaft 8. The control-lever has two bosses 68 69 in positionto impinge against the stop 66 or 67, respectively, when the control-lever has been moved to its extreme left-hand or right-hand position by movement of the rockarms 7, carrying the teeth 59 60, and by reason of the change in the working length of the belts due to the automatic operation of the gear mechanism when thrown into engagement to either increase or decrease the speed The stop 66 or 67striking the corresponding boss 68 or 69 throws the control-lever to its inoperative central position, the spring-tooth riding over the tooth 59 or 60 and entering between the two. The modification shown in Fig. 7 differs from that heretofore described in that the radially-slotted rim-section-guiding plates 7 0 71 72 are keyed to the pulley-shaft 6, while the adj usting-disks 73 4 75 76 are fixed on sleeves 77 7 8, which are revolubly supported on this shaft. spiral cam-slots 79, through which the ends 80 of the rim-sections 23 project into the radial slots of the guiding-plates. Since the adjusting-disks would be unduly weakened by cutting through them a spiral cam-slot of slow pitch, like that of the spiral cam-grooves 13, heretofore described, it is preferable to employ several short spiral slots of greater pitch in each disk, each slot receiving one or more rim-sections. The disks 7 4 and 75 are rigidly connected together by marginal flanges, and

the disk 76 is similarly secured to a disk 81,

carried by a gear and clutch member 21, like that heretofore described. The adjustingdisks may thus be rotated with reference to the guiding-plates by the gear mechanism already described.

In the modification shown in Figs. 8, 9 the adjusting-disks 9 10 11 are keyed on a tube 85, whichis revolubly supported on the shaft 6. The guiding-plates are carried by sleeves 19, which are revolubly supported on the tube 85. A plate 86 is fixed on the shaft outside the adjusting-disk 9 by a key 87 and has a peripheral flange 86, which is bolted to the flange 14 of the guiding-plate 14. The guiding-plates 14 15 16 17 being rigidly secured together by the sleeves 19 and flanges 15 16 are thus caused to rotate with the pulley-shaft, while the adjusting-disks, also rigidly secured together by the tube 85, are free to rotate on this shaft. The adjustment of the rim-sections is effected by rotating the set of adjusting-disks, as by the mechanism shown in Fig. 3, the gear-teeth 29 and clutch-teeth 30 being cut in acentral boss on the adjusting-disk 11.

The modification shown in Fig. 10 employs a triple pulley. 5, the two outer drums of which expand and contract in unison and in opposition to the middle drum, which receives the belt 3 from the driving-pulley 1. One of theouter drums of the triple pulley carries the open belt 4 of the driven pulley 2, and

'the other outer drum carries the crossed belt 4 of the driven pulley 2". A clutch mechanism is provided to throw either of the driven pulleys 2 or 2 into engagement with the driven shaft.

Thefmodification shownin Fig. 11 employs two double pulleys 5' 5", each similar to that shown in Fig. 1 and belted together between the driving-pulley l and the driven pulley 2. The control-levers of these two double pulleys are connected by a reciprocating bar 82, the end of which is pivoted to an operating-lever 83. Helical cushioning-springs 84L are preferably interposed between the bar 82 and each side of each control-lever 41.

I claim- 1. A pulley having plural drums, each drum comprising movable rim-sections, guides for said rim-sections, and adjusting devices engaging the ends of each rim-section, as set forth. Each of the adjusting-disks also has 2. Apulley having plural drums, each drum comprising movable rim-sections, plates having substantially radial guides for said rimsections, and disks having adjusting devices engaging the ends of each rim-section, said disks being revoluble with reference to said plates, as set forth. I

' 3. A pulley having plural drums, each dru comprising movable rim-sections, plates having substantially radial guide-slots for said rim-sections, and disks having spiral Ways engaging the ends of each rim-section, said disks being revoluble with reference to said plates, as set forth.

4. A pulley having plural drums, each drum comprising movable rim-sections, guides for said rim-sections, adjusting devices engaging the ends of each rim-section, and means for simultaneously operating the adjusting devices of both drums and thereby contracting one drum and expanding the other drum, as set forth.

5. Apulley having plural drums, each drum comprising movable rim-sections, plates having substantially radial guides for said rimseetions, disks having adjusting devices engaging the ends of each rim-section, said disks being revoluble With reference to said plates, and means for simultaneously rotating said disks with reference to said plates and thereby contracting one drum and expanding the other drum, as set forth.

6. A pulley having plural drums, each drum comprising movable rim-sections, plates having substantially radial guide-slots for said rim-sections, disks having spiral ways engaging the ends of each rim-section, said disks being revoluble with reference to said plates, and means for simultaneously rotating said disks with reference to said plates and thereby contracting one drum and expanding the other drum, as set forth.

7. In a pulley having plural drums and movable rim-sections, three ad justing-disks having spiral ways and rigidly secured together, as set forth.

8. In apulley having plural drums and movable rim-sections, three adjusting-disks having spiral ways and rigidly secured on the pulleyshaft, as set forth.

9. In apulley having plural drums and movable rim-sections, four plates having substantially radial guideways for said rim-sections, said plates being rigidly connected together and revolubly supported on the pulley-shaft, as set forth.

10. A pulley having plural drums, each drum comprising movable rim-sections, plates having substantially radial guides for said rimsections, disks having adjusting devices engaging the ends of each rim-section, said disks and plates being relatively revoluble, and sleeves mounted on the pulley-shaft between the fixed members of each drum and carrying the revoluble members of each drum, as set forth.

11. A pulley having plural drums, each drum comprising movable rim-sections, plates having substantially radial guides for said rimsections, disks having adjusting devices engaging the ends of each rim-section, said disks and plates being relatively revoluble, sleeves mounted on the pulley-shaft between the fixed members of each drum and carrying the revolulole members of each drum, and means for rigidly connecting the adjacent revoluble members of each drum, as set forth.

12. A pulley having plural drums, each drum comprising movable rim-sections, plates having substantially radial guides for said rim-sections, disks having adjusting devices engaging the ends of each rim-section, said disks and plates being relatively revoluble, sleeves mounted on the pulley-shaft between said disks and carrying the guiding-plates, and means for rigidly connecting the adjacent similar members of each drum, as set forth.

13. A pulley having plural drums, each drum having movable rim-sections, plates having guideways for said rim-sections, the adjacent guiding-plates'of each drum being rigidly connected at their peripheries, and means for adjusting the rim-sections, as set forth.

14:. A pulley having -plural drums, each drum having movable rim-sections, two adjacent plates having guide-slots and rigidly con' nected at their peripheries, and an adjustingdisk fixed on the pulley-shaft between the guiding-plates, as set forth.

15. A pulley having plural drums, each drum comprising movable rim-sections, plates having substantially radial guideways forsaid rim-sections, and disks having adjusting devices engaging the ends of each rim-section, said disks and plates being relatively revoluble, and means for rigidly connecting the adjacent revoluble members of each drum at their peripheries, as set forth.

16. A pulley having plural drums, each drum comprising movable rim-sections, plates having substantially radial guideways for said rim-sections, and disks having adjusting devices engaging the ends of each rim-section, said disks and plates being relatively revoluble, and means for rigidly connecting the adjacent guiding-plates of each drum at their peripheries, as set forth.

17. A pulley having plural drums, each drum having movable rim-sections, plates having guideways for said rim-sections, and three adjusting-disks fixed on the pulleyshaft, as set forth.

18. A pulley having plural drums, each drum having movable rim -seetions, three spirally-grooved adjusting-disks fixed on the pulley-shaft, four slotted guiding-plates revolubly supported on said shaft, and means for rotating said guiding-plates on said shaft, as set forth.

19. A pulley having plural drums, each drum having movable rim-sections, three spirally-grooved adjusting-disks fixed on the pulley-shaft, and four guiding-plates revolubly supported on said shaft and having slots crossing the spiral grooves of said adjustingdisks, as set forth.

20. A pulley having plural drums, each I drum comprising movable rim-sections, ad-

justing-disks fixed on the pulley-shaft and h avin g spiral ways which engage the ends of each rim-section, and guiding-plates having substantially radial gulde-slots for said rim-sections, the guiding-plates of each drum being carried on the ends of a sleeve revolubly supported on the pulley-shaft between said adjusting-disks, as set forth.

21. A pulley having plural drums, each drum comprising movable rim-sections, adjusting-disks fixed to the pulley-shaft and having spiral ways which engage the'ends of each rim-section, and guiding-plates having substantially radial guide-slots for said rimsections, the guiding-plates of each drum being carried on the ends of a sleeve revolubly supported on the pulley-shaft between said adjusting-disks, and the adjacent guidingplates of the two drums being rigidly connected togetherat their peripheries, as set forth. 22. An expansible pulley comprising movable rim-sections, a guiding member and an adjusting member for said rim-sections, one of said members being fixed and the other revoluble with reference to the pulley-shaft, and means for operating said revoluble member, comprising a gear which is connected thereto and which is loose on the pulley-shaft, a second gear which is attached to the pulleyshaft, a movable control member, and two gears carried by said member, one of which is adapted to engage with said revoluble gear and the other with said fixed gear, two of said engaging gears being of different diameters, as set forth.

23. An expansible pulley, comprising movable rim-sections, a guiding member and an adjusting member for said rim-sections, one

i of said members being fixed and the other revoluble with reference to the pulley-shaft, and means for operating said revoluble member, comprising a gear which is connected thereto and which is loose on the pulley-shaft, a second gear which is fixed on the pulleyshaft, a movable control member, and two gears carried by said member one of which is adapted to mesh with said revoluble gear and the other with said fixed gear, two of said meshing gears having a different number of teeth, as set forth.

24:. An expansible pulley, comprising movable rim-sections, a guiding member and an adjusting member for said rim-sections, one of said members being fixed and the other revoluble with reference to the pulley-shaft, and means for operating said revoluble member, comprising a gear which is connected thereto and which is loose on the pulley-shaft, two gears which are fixed on the pulley-shaft, a movable control member, and two sets of gears carried by said member either of which is adapted to mesh with said revoluble gear and one of said fixed gears, two'of the gears which are thrown into mesh by a movement of said control member in either direction being of different diameter and the gears which alternately meshwith said fixed gears also being of different diameter, as set forth.

25. An expansible pulley, comprising movable rim-sections, a guiding member and an adjusting member for said rim-sections, one of said members being fixed and the other revoluble with reference to the pulley-shaft, and

means for operating said revoluble member, comprising a gear which is connected thereto and which is loose on the pulley-shaft, two

I gears which are fixed on the pulley-shaft, a

movable control member,and two sets of gears carried by said member either of which is adapted to mesh with said revoluble gear and one of said'fixed gears, two of the gears which are thrown into mesh by a movement of said control member in either direction having a different number of teeth and the gears which alternately mesh with said fixed gears having a different number of'teeth, as set forth.

26. An expansible pulley, comprising movable rim-sections, a guiding member and an adjusting member for said rim-sections, one

of said members being fixed and the other revoluble with reference to the pulley-shaft,

a clutch for locking said revoluble member to the shaft, and means for opening said clutch *and rotating said revoluble member, as set forth.

- 27. Anexpansible pulley, comprising movable rim-sections, a guiding member and an adjusting member for said rim-sections, one of said members being fixed and the other revoluble with reference to the pulley-shaft, a clutch for locking said revoluble member to the shaft, and a movable control member carrying means for opening said clutch and rotating said revoluble member, as set forth.

28. An expansible pulley, comprising movable rim-sections, a guiding member and an adjusting member for said rim-sections, one of said members being fixed and the other revoluble with reference. to the pulley-shaft, rock-arms carrying the pulley-shaft, and means for rotating said revoluble member, as set forth.

29. An expansible pulley, comprising movable rim-seotions, a guiding member and an adjusting member for'said rim-sections, one of said members being fixed and the other revoluble with reference to the pulley-shaft, rock-arms carrying the pulley-shaft, a control-lever having. means for rotating said revoluble member, and a detent for said lever carried by one of said rock-arms, as set forth.

30. An expansible pulley, comprising mov able rim-sections, a guiding member and an adjustable member for said rim-sections, one

in the other direction when thrown to another position, as set forth.

31. An expansible pulley, comprising movable rim-sections, a guiding member and an adjusting member for said rim-sections, one of said members being fixed and the other revoluble with reference to the pulley-shaft, a rock-shaft having rock-arms which carry the pulley-shaft, control mechanism journaled on said rock-shaft and carrying devices for ro-.

tating said revoluble member in one direction when thrown to one position and in the other direction when thrown to another position, and means for holding said mechanism in position, as set forth.

32. An expansible pulley, comprising movable rim-sections, a guiding member and an adjusting member for said rim-sections, one of said members being fixed and the other revoluble with reference to the pulley-shaft, a rock-shaft having rock-arms which carry the pulley-shaft, control mechanism journaled on said rock-shaft and carrying devices for rotating said revoluble member in one direction when thrown to one position and in the other direction When thrown to another position, means for holdingsaid mechanism in position, and fixed stops for limiting the movement of said mechanism in either direction and throwing it to its inoperative position, as set forth.

33. A speed-changing mechanism, comprising a driving-pulley, a driven pulley, an intermediate double pulley, one drum of which is belted to said driving-pulley and the other to said driven pulley, means for simultaneously contracting one drum and expanding the other drum of said double pulley, and movable bearings for said double pulley, as set forth. I

34. A speed-changing mechanism, comprising a driving-pulley, a driven pulley, an intermediate double pulley, one drum of which is belted to said driving-pulley and the other to said driven pulley, means for simultaneously contracting one drum and expanding the other drum of said double pulley, a reciprocating frame supporting said double pulley, and adjustable means for limiting the travel of said frame, as set forth.

35. A speed-changing mechanism, comprising a driving-pulley, a driven pulley, an intermediate double pulley, one drum of which is belted to said driving-pulley and the other to said driven pulley, means for simultaneously contracting one drum and expanding the other drum of said double pulley, and

rock-arms carrying bearings for said double pulley, as set forth.

36. A pulley having at least three drums, each drum comprising movable rim-sections, and means for simultaneously moving the rim-sections of the end drums and adjacent drums in opposite radial directions, as set forth.

In testimony whereof I have aflixed my signature in the presence of two witnesses.

' CHARLES J. REED.

Vitnesses:

JAMES WV. LAWS, RoB'r. B. FLETCHER.

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