USRE14073E - Power-transmission and speed-controlling device - Google Patents

Description

' w. P. ALLEN. I POWER TRANSMISSIQN AND SPEED CONTROLLING DEVICE.

APPLICATION FILED SEPT. 9, I915- Reissued Feb.15, 1916.

4 SHEETS-SHEET w. P. ALLEN. POWER TRANSMISSION AND SPEED CONTROLLING DEVICE.

7' APPLICAHGN HLED sen. 9. m5. RBiSSllBd Feb. 15, 1916. T

4 SHEETS-SHEET 2.

7a; mfg s w. P. ALLEN.

rowan TRANSMISSION AND smu comnoumc DEVICE. APPLICATIDN FILED EFT. 9. 1915: I Relssued' Feb. 15, 1916. 14,073.

4 suns-sneer a.

I 'fizveni-or I William 2 12507,

w. P. ALLEN. POWER TRANSMISSION AND SPEED CONTROLLING DEVICE.

APPLICATION FILED SEPT. 9, IBIS.

Reissued Feb. 15, 1916.

Whey

WILLIAM F. ALLEN, or onrcaeo, ILLINOIS.

POWER-TRANSMISSION AND SPEED-CONTROLLING DEVICE.

Specification of Reissned Letters Tatent. Reissud F (51). 15, 1916.

Original No. 1,112,586, dated October 6, 191a, Serial 110. 737,380. Application for reissue filed September To all whom it may concern Be it known that I, humor I. ALLEN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Power -Transmission and Speed-Controlling Devices, of which the fol lowing is a specification, reference being had to the accompanying drawings, forming a part thereof.

The purpose of this invention is to provide an improved mechanism for transmittingpower particularly adapted for variably reducing the speed of the rotary motion in the transmission of the same and readily controlling the reduction at will. the devices for that purpose being especially designed so as to transmit substantially the full power at all speeds.

' It consists in construction shown and cated in the claims.

In the drawings: Figure 1 is a partly sectional plan 'view of a portion of a frame havin mounted within it mechanism embodying this invention. sections being made at the line 11, on Fig. 2 and 1--1.' on Fig. 3. Fig. 2 is asection at the line, 2-2, on Fig. 1, showing the casing partly broken away to disclose interior details. Fig. 3 is a section at the line. on Fig. 1. Fig. 1 is a section at the line, 41, on Fig. 1. l 'ig. is a detail elevation of a member of gear element partly disclosed in Fig. 2. Fig.- (3, is a detail section at the line, 6t' o Fig. 1. Fig. 7 is a side elevation of a detachable element of a casing shown in Fin. 2. Fig. 8 is a detail section at the line, 8-45, on Fig. 7. Fig. 9 is a detail elevation of a the elements and features of described as indiclutch device on the main shaft.

' In the drawings, I'IGPI'GSQlllT-S the framework of a self-propelled vehicle which car- .ries a motor, conventionally represented at 2, and power-transmitting mechanism involved in this invention.

.3 is the principal power-transniittingshaft with which the parts constituting the inyention in question are most directly associated. This shaft is driven by any convenient driving connection from the motor shaft, and it mayconstitute the motor shaft, as shown in the drawings. applied to the purpose of a tractor, this shaft may hare'associated with it at two points in its length duplicate transmitting trains operating at right angles to each rther.

Serial No. 49,836.

identically in all respects, and each comprising as the final element a sprocket wheel, 41. One of these trains is fully shown in sectional View on. Fi". 2, and the other appears in elevation in that view, the casing, 5, which forms a part of the sprocket wheel, 4, inclosing the remaining elements of the train. The description of one of these trains will answer for both. On the shaft, 3, there is secured fast by a key, (3, an eccentric, 7, upon which there is journaled as a counterpart thereto for operation ecccntrically with respect to the shaft a gear, 8. the gear being mounted on the eccentric, preferably by means of a roller hearing which is of familiar construction, comprising' the rollers, 9, journaled in annular carriers, 10, 10.

11 is a counterweight arm which is mounted on the shaft, 3, and made rigid therewith by the same key, 6, which secures the eccentrio, 7, to said shaft, said counterweight arm being positioned properly for counterbalancing the eccentric, 7, and the gear, 8, thereon.

12, is a. casino; sleeve which is provided with means by which it may be held nonrotatable or may he released for rotation at will. a hereinafter (lescribcd. This sleeve or :asinn is mounted concentrically with the shaft, 3, for relativerotation of the shaft with respect to the using by means of ball hearings interposed between the shaft and the sleerc, one near each end of said sleeve within the casing. 5, as seen at 13 in Fig. 1.

14- is a plate which is rigidly engaged with the sleeve, 12, by means of projections, 12, at the end of the casing which take into apertures, 14", in the plate, this expedienta llording a convenient means of assemhlinn' the parts. as will hereinafter appear. lllHlOlllllilSSlllg the shaft, 3, intermediate the plate, 1-11. and the gear. 8, is a trammel plate or ring, 15, which performs the function of a trammel plate by means of two pairs of slots. 15 and 15, situated in diametric lines The slots, 15), are engaged by stud-and-roll abutments, 16, which project from the side of the gear, 8, and the slots, 15*, are similarly engaged by similar stud-and-roll abutments, 17, which project from the plate. 1-il-. It will be observed that this trannnel 'plate withthe studand-ro-ll engagements described connecting the gear, 8, to the plate, 1 controls the action of the eccentric gear when the shaft, 3, and the eccentric, 7, thereon are rotated, causing the eccentric gear to follow a path circular about the axis of the shaft, 3, and eccentric to its own axis without any rotation about its own axis.

18 is an internal gear which is formed rigid with the casing, 5, herein-above mentioned as rigid with and forming part of the sprocket wheel, 4. This casing terminates in a hub, 19, by which it is journaled outside of the casing sleeve, 12, and thereby concentrically with the shaft, 3. The sprocket wheel, 4, and thereby the gear, 18, are provided with a second bearing on the shaft, 3, consisting in a disk or web, 20, having a hub, 21, which is provided with a ball bearing, '22, on the shaft 3. The internal gear, 18, has a pitch equal to the greatest radius of the eccentric gear,-that is, the pitch radius of said eccentric gear measured from the shaft, 3, at the point of greatest eccentricity of said gear, 8,and thereby said gear, 8, is adapted to mesh with said internal gear, 18, as seen in Fig. 3. 'The internal gear, 18, is designed to have a small number of teeth in excess of the number of teeth of the gear, 8. As illustrated in the drawings, the internal gear has one-eighth greater number of teeth than the eccentric gear, 8.

The construction above described, it will beunderstood, causes the eccentric gear, 8, to transmit to the internal gear, 18, rotary motion derived from the shaft, 3, in the I same direction as that in which the shaft rotates and at a speed whose ratio to that of the shaft is the ratio of the difference between the number of teethon the two gears to the number of teeth on the internal gear; that is, in the specific construction shown in the drawings, one revolution to nine revolutions of the shaft.

The ends of the hubs, 21, are closed by caps, 23, fitting about the shaft, 3, and thereby there is formed a continuous oil chamber within the continuous casing formed by the sleeve casing, 12, the casing, 5, the sprocket wheel, 4, and the disk, 20, and its hub, 21, so that both trains contained within the casingfb, run in a lubricant at all times.

It will be observed that if the gear, 8, is not restrained at all as to rotation about its own axis by the trammel device mounted upon the sleeve, 12, but if, on the contrary, said gear, 8, revolves freely about its axis,

as will be thecase when the clutch, 12, is

disengaged so that the sleeve, 12, is not connected for rotation with the gear, 27, and

the rotation of the sprocket wheel, 4, is

his

blocked by a certain amount of work with which it is connected, the gear, 8, will merely roll around within the internal gear, 18, without rotating the latter at all, said gear,

partly restrained against rotation so as to' partlyrestrain the rotation of the gear, 8, the result will be a rotation of the gear, 18, at a speed which will be such proportion of one-ninth of the speed of the shaft, 3, as the diminution of speed of the gear, 8, and trammel device is of the full speed of the shaft.

25 is a countershaft parallel with the shaft, 3, ournaled in the same frame. I

26 is a gear which is mounted loose on the casing sleeve, 12, andconnected therewith for rotation thereby by means of a clutch comprising a sliding member, 12 feathered on the sleeve for sliding thereon, the counterpart member being formed as the hub, 26", of the gear, 26. A shipping lever, 12, is fulcrumed on the casing, 28, and connected by pivots with a two-part collar, 12, which engages a peripheral groove, 12 in the clutch member, 12", for sliding said clutch member on the sleeve into and out of engagement with the counterpart clutch m'ember,-said hub, 26, of the gear, 26. The casing, 28, incloses both said gears, 26 and 27, such casing being provided with bearings by which it is hung on the sleeve, 12, and on the shaft, 25. The hub, 26', of the gear, 26, protrudes through the casing to form the counterpart clutch member 006perating with the clutch, 12", on the sleeve, 12, as described. Rigid with the shaft, 25, and, if preferred, integral with the gear, 27, there is mounted a worm wheel, 30, and in the casing, 28, there is journaled a shaft,

31, having a. worm, 32, which meshes with readily communicate rotary motion to the' shaft. 31, by its engagement with said worm, 32. The shaft, 31, extends outside of the casing, 28, and on its exteriorly protruding portion there is mounted rigid with it a brake wheel, 35, and a pulley or band wheel, 36 The brake wheel is fitted with a brake shoe, 37, from which connections are provided bywhich the operator may apply suflicient pressure to control, and if desired, entirely prevent, the rotation of the shaft, 31.

39 is a pulley on a shaft, 40, which is rotated by any convenient means of transmitting motion to it from the motor, as by a gear, 42, on the shaft, 3, meshing with a gear, 41, on the shaft, 40. A belt, 43, connecting the pulley, 39, with a pulley, 36, rotates the latter in the same direction in .which said pulley, 36, is rotated by the rota- 32. A tightener pulley, 46, is provided for taking up the slack in the belt, 45, which ninth that of said when entirely slack -is.too loose to drive the pulley, 36. The lever, 47, controlling the tightener pulley enables the operator to cause the shaft, 31, to revolve at any rate of speed up to the maximum which can be communicated by the connections shown from the main shaft, 3, and the connections are designed to be such that the maximum speed communicated may be such as to rotate the gears, 26 and 27, at the maximum speed of the sleeve, 12; that is, the speed which it derives when the internal gear, 18, is held at rest by the resistance of the work with which the sprocket wheel, 4, is connected. When the application of the tightener pulley has brought the speed of the gear, 26, up to said speed of the sleeve, the operator may throw the clutch in mesh connecting the sleeve with the gear, 26, without jar. If now, when the clutch has been connected as described, the tightener,pulley is withdrawn so as to cease to drive the worm, 32, andzth e/bralfe is applied so as to check the rotation of said worm'which it will otherwise derive from the worm wheel with which it is meshed, the speed of the gears, 26 and 27, and the sleeve, 12, now engaged therewith by the-clutch being restrained, the rotation of the gear, 8, about its own will be correspondingly restrained and ro tation will be communicated to the internal gear, 18, and the sprocket wheel,-4, in proportion to this restraint, such rotation being in the same direction as that of the shaft, 3, and reaching a speed, according to the construction shown in the drawings, of oneshaft, 3, when the rota.- tion of the gears, 26 and 27, and the sleeve, 12, is entirely prevented by the restraint imposed by the brake. It will also be observed that by rotating the shaft, 81, in the same direction in which it would be rotated by the connections extending from said shaft back to the trammel device and gear, 8, at any speed less than that which it would derive from the maximum speed of rotation which the gear, 8, can derive from the shaft,

3, the speed of the sprocket-wheel, l, can

be positively controlled at any rate from Zero up to its normal maximum speed of one-ninth that of the shaft, '3, and that by using this means shaft,"31, as distinguished rom merely restraining its rotation by the brake device, he operator may cause the-sprocket wheel, 4, to, rotate with the full power which can be derived from the motor on at any speed suitable to the work to be done, up to the said maximum normal speed of Said sprocket wheel, l. \Vhen this device is applied to such purpose as that of a traetor, the operator is by this means enabled to Start the tractor from rest as gradually to positively rotate the.

the shaft, 3,

desired, bringing into operation the full power of a motor running at its maximum speed for the purpose of starting, and ually increasing the speed of the tractor as it gains momentum and can be thus increased in speed without causing it to slip. This is the purpose of the construction shown.

It will be 16VQ1. be applied when the pulley, 36, is beingdrivenby the belt; that is, that the tightener and the brake shoe would never be in service at the same time; on the contrary, in modifying the speed from the highest to the lowest, the action would be to slacken the brake until it was entirely out of action, and then gradually apply the tightener until the speed of the pulley, reached the maximum. It is therefore feasible to connect the brake lever and the tight ener lever for simultaneous and consecutive operation,) the movement of the operating device in one direction withdrawing the tightener and applying the brake, and in the opposite direction withdrawing the brake and applying the tightener, This is conveniently accomplished, as shown, by connecting the brake strap or shoe, 37, with an arm, 4C8, of the same rock shaft, &9, which on another arm, 50, carries the tightener ulley, -16, the hand lever, 47, shaft thus serving the operator for controlling the brake and the tightener, as described, by continuous movement in the one direction for slacking the speed, and in the other direction for increasing it. i

The specific construction of the casing, 28, and the gear, 26, shown in the drawings, is designed for convenience in assembling the parts, the gear, 26, being made in two pieces,-an outer piece which comprises the gear rim, and a central piece, 26, which has the hub, 26, above mentioned, said central piece being in the form of a flanged collar adapted to be bored out for seating accurately on the sleeve, gear, 26 and 26, being secured together by screws, 26, taking through the flange of the part, into the body of the outer member of the gear. In addition to the screws for securing the two pieces together, they are further connected for positive rotation of the outer by the inner by means of lugs, 26, which project from the face of the outer member and are engaged bet-ween the lugs, 26, which project radially from said inner member. The casing, 28, comprises two members parted at'the plane, containing the axes of the shafts, 3 "and 2 and provided with flanges by which the two members are secured together. One side of the casing is provided with a removable plate comprising two members, 28 and 2 which are adapted to be applied to that side, closing except as gradevident that the brake will.

12, the two parts of the of said rock an aperture therein which is suitable for rec'eiving the central member, 26, of the gear,

'26. It will be observed that all the cavities I of the housings or casings containing the gear trains, described are 'adapted to communicate so as to constitute a continuous lubricant chamber which may be filled with lubricant in which all the shafts and gears run.

1. In a power-transmitting device, in combination with a rotating shaft, an eccentric thereon; a spur gear journaled on the eccentric; an internal gear having a greater number of teeth than the spur gear meshing with the latter and journaled concentrically with the shaft; a trammel device for controlling the rotation of the spur gear about its own axis; and means controllable at will for rotating the trammel device about the aXis of the shaft.

2. In a power-transmitting device, in combination with a rotating shaft, an eccentric thereon; a spur gear journaled on the eccentric; an internal gear having a greater number of teeth than the spur gear meshing with the latter and journaled concentrically with the shaft; a trammel device for controlling the rotation of the spur gear about its own axis, means for rotating the trammel device about the axis of the shaft, and means for varying at will the rate of, such rotation.

3. In a power-transmitting device, in combination with a rotating shaft; an eccentric thereon; a spur gear journaled on the eccentric; an internal gear having a greater number of teeth than the spur gear meshing with the latter and journaled concentrically with the shaft; a plate surrounding the shaft and means for holding it against rotation there with; trammel plate mounted on the shaft between the last-mentioned plate and the spur gear, said trammel plate having slots in diametrical lines, transverse to each 'other;'abutments on the gear engaging said slots in one of said lines, and abutments on the plate engaging the slots in the other of said lines; asleeve co-axial with the shaft: engaged endwise with the plate for rotating or holding the same against rotation about the shaft; a casing journaled on the sleeve and rig d with said internal gear, and means for holding the sleeve against rotation about the shaft. 7

4. In a power-transmitting device, in combination with a rotating shaft, an eccentric thereon; a spur gear journaled on the eccentric; an internal gear having a greater number of teeth than the spur gear meshing therewith and journaled concentrically with I the shaft; a sleeve encompassing the shaft, and roller bearings by which it is spaced therefrom and journaled thereon, the means by which the internal gear is journaled concentrically with the shaft comprising a casing rigid with said gear and journaled on the sleeve; a trammel device for controlling the rotation of the spur gear about its own axis, comprising a plate within the lastmentioned casing engag by the sleeve for holding thereby or IOliz tion therewith; a trammel plate interposed between the lastmentioned plate and the spur gear having sliding connection with both, said connections being for sliding in lines transverse to each other, and means forcontrolling the ro tation of the sleeve'about the shaft.

5. In a power-transmitting device, in combination with a rotating shaft, a casing sleeve encompassing the shaft for a part of its length; two power-transmitting wheels, one at each end of the sleeve, each having a hollow hub constituting a gear casing, said casing being journaled at one end directly on the sleeve, and at the other end indirectly on the shaft beyond the end of the sleeve;

ball bearings interposed on the shaft besleeve encompassing the shaft for a part ofits length; a power transmitting wheel at one endof the sleeve having a hollow body constituting a gear casing, said casing being journaled at one end directly on the sleeve, and at the other end indirectly on the shaft beyond the end of the sleeve; ball bearings interposed on the shaftbetwee'n the same and the sleeve for journaling the latter on the former, and ball bearings by which the outer end of the wheel hub is journaled on the shaft; a collar which closes the outer end of the casing hub and is journaled directly on the shaft; means for closing the opposite end of the sleeve, and a gear train within the casing hub of the power wheel for trans mitting rotation from the shaft to said wheel.

7. In a power-transmitting device, in combina tion with a rotating shaft, a sleeve encompassing the same for a portion of its length; bearing devices by which the sleeve is spaced from and journaled on the shaft; a powertransmitting wheel mounted on the shaft at one end of the sleeve comprising a gear casing encompassing the shaft and having hubs, one of said hubs being journaled diing the other member of casing for engaging said element; one member of a spiral gear pair connected with the sleeve for rotation therewith; a shaft havsuch pair engaging said first member, means for communicating rotation to said last-mentioned shaft, and a brake device for retarding the rotation of said shaft.

8. In a power-transmitting device, in com-- bination with a rotating power shaft, a sleeve encompassing said shaft for a portion of its length, and bearing devices by which the sleeve is spaced from and journaled on the shaft; a power-transmitting wheel mounted on the shaft at one end of the sleeve comprising a. gear casing which en compasses the shaft and has hubs of which one is journaled directly on the sleeve and the other on the shaft beyond the sleeve; a gear train within said casing for communieating rotation from the shaft to the powertransmitting wheel, said train comprising an element adapted to be either rotated with, or held nonrotatable with respect to, the shaft, the sleeve having one end extended into the gear casing for engaging said element; one pair connected with the sleeve for rotation therewith; a shaft having the other member of such pair engaging said first member for comnumicating rotation to the last-mentioned shaft, and means for controlling its rotation at will.

9. In a power-transmitting device, in combination with a rotating power shaft, a

sleeve encompassing said shaft for a portion of its length, and bearing devices by which the sleeve is spaced from and journaled on the shaft; a power-transmitting wheel mounted on the shaft at one end of the sleeve comprising a gear casing which encompasses the shaft and has hubs, of which one is journaled directly on the sleeve and the other on the shaft beyond the sleeve; a

gear train within said casing for communieating rotation from the shaft to the power-' transmitting'wheel, said train comprising an element adapted to be either rotated with,-

or held non-rotatable with respect to, the shaft, the sleeve having-one end extended into the gear casing for engaging said ele ment; a worm gear connected with the sleeve for rotation therewith; a shaft having a worm engaging said worm gear; a

brake device operable at will for retarding the rotation of said shaft; frictional driving means and means for varying the frie tional engagement to vary the speed at which the shaft is rotated.

10. In a power-transmitting combination with a rotating shaft, a sleeve encompassing the same for a portion of its member of a spiral gear device, in

length, and bearing devices by which the sleeve is spaced from and journaled on the.

shaft; ti'o power-transmitting Wheels mounted on the shaft at opposite ends of the sleeve, each comprising a gear casing encompassing the shaft and shaving hubs one of which is journaled directly on the sleeve and the other on the shaft beyond the sleeve; gear trains within said casings for communicating rotation from the shaft to said power-transmitting;wheels; res; c,

encompassing the shaft and having hubs one of which is journaled directly on the sleeve and the other on the shaft beyond the sleeve; gear trains within said casings for communicating rotation from the shaft to said power-transmitting wheels, respectively; said gear trains comprising each an element adapted to be rotated or to be held non-rotatable with respect to the shaft; the sleeve having its ends extended into the casing for engaging said elements, respectively; one member of a spiral gear pair connected with the sleeve for rotation therewith; a shaft having the other member of such pair engaging said first member; meansfor communicating rotation to said shaft; a brake wheelon said shaft and a brake device for engaging the brake wheel.

1:2, In a power-transmitting device, in combination with a rotating shaft, a sleeve encompassing the same for a portion ofits length, and bearing devices by which the sleeve is spaced from and journaled on the shaft; two power-transmitting wheels power-transmitting device, in

mounted on the shaft at opposite endslof the sleeve, each comprising a gear casing encompassing the shaft and having hubs one of which is journaled directly on the sleeve and the other on the shaft beyond the sleeve; gear trains within said casings for communicating rotation from the shaft to said power-transmitting wheels, respectively; said gear trains comprising each an element adapted to be rotated or to be held non-rotatable with respect to the shaft; the sleeve having its ends extended into the casing forengaging said elements, respectively; one member of the spiral gear pair connected with the sleeve for rotation therewith; a shaft having the other member of such pair engaging said first member, and meansfor communicating rotation to said shaft and for controlling its rotation at Wllli 13."In a power-transmitting device, in combination with a rotating shaft, a sleeve encompassing the same for a portion of its r length, and bearing devices by which the sleeve is spaced from and journaled on the shaft; two power-transmitting wheels mounted on the shaft at opposite ends of the sleeve, each comprising a gear casing encom-x' passing the shaft and having hubs one of which is journaled directly on the sleeve and the other on the shaft beyond the sleeve; gear trains within said ings for communicating rotation from the shaft to said powertransmitting wheels, respectively; said gear trains comprising each an element adapted to be rotated or to be held non-rotatable with respect to the shaft; the sleeve having its ends extended into the casing for engaging said elements, respectivel one member of a spiral gear pair connected with the sleeve for rotation therewith; a shaft having the other member of such pair engaging said first member; means for variably resisting the'rotation of said shaft, means for variably communicating rotation to the same, and means for controlling at will said resisting means and said rotating means.

14. In combination with a power shaft and a power Wheel thereon, a gear train wheel; a sleeve on the shaft and means connecting it with said retardable part of the train; a separate train for rotating .id sleeve, and means for varying at will the speed of said separate train.

15. In combination With a power shaft and a power wheel thereon, a gear train whose members are mounted on the shaft wheel; a sleeve on the shaft and means connecting it with said retardable part of the train; a separate train for rotating said sleeve, said separate train compri ng a clutch engageable and disengageable for transmitting or interrupting the transmission of motion from said,train.

16. In combination with a power shaft and'a power wheel thereon, a gear train 7 whose members are mounted on the shaft for transmitting motion between the shaft whose members are mounted on the and the wheel, said train comprising a part whose retardmcnt tends to increase and whose acceleration tends to reduce the motion transmitted between theshaft and wheel; a sleeve on the shaft and means connecting it with said retardable part of the train; a separate train for rotating said sleeve, said separate train comprising a clutch engageable and disengageablel at will to transmit or interrupt the transmissicni or motion from said train, and means for varying at will the speed of said separate train.

17. In combination with a power and a power wheel thereon, a gear for transmitting motion between the shaft and the wheel, said train comprising a part whose retardment tends to increase and whose acceleration tends to reduce the motion transmitted between the shaft 2 and wheel; a sleeve on the shaft and means connecting it with said retardable part of the train; a separate train for rotating said sleeve, said train comprising a spiral gear pair and a brake for retarding the motion of the 'more rapidly rotating of the two members of said pa r.

18;[ 1'n combination with a power shaft and a power wheel thereon, a gear train whose members are mounted on the shaft for transmitting motion between the shaft and the wheel, said train comprising a part whose retardment tends to increase and whose acceleration tends to reduce the motion transmitted between the shaft and wheel; a sleeve on the shaft and means con necting it with said retardable part of the train; a separate train for rotating said sleeve, said train comprising a spiral gear pair and means for retarding atwill the speed of said separate train.

19. In combination with a power shaft and a power wheel, a gear train whose members are connected for transmitting motion between the shaft and the wheel, said train comprising a part whose retardment tends to increase and whose acceleration tends to reduce the motion transmitted; a sleeve on the shaft connected for rotation by said retardable part;-a separate gear train connected for controlling the rotation of'said sleeve, and a brake device for retarding said train.

20. In combination with a power shaft and a power wheel, a gear train whose members are connected for transmitting motion between the shaft and the wheel, said train comprising a part whose retardment tends to increase and whose accelerationtends to'reduce' the motion transmitted; asepa rate train for controlling the rotation of said retardablc part, such train comprising a member geared up to revolve, at several times the angular velocity of suchfpart, and

for retarding the motion of up member. shination with a power shaft wheel, a gear train whose memnected for transmitting motion and the wheel, said train v2 part whose retardmenttends and whose acceleration tends to motion transmitted; a spiral ing one member connected for i aid retardable part, and a brake variably resisting rotation of amber of said pair.

ibination with a power shaft wheel thereon, a gear train .S are mounted on the shaft motion between the shaft train comprising a part .nds to increase and wimse ncls to reduce the motion netween the shaft and wheel; a sleeve on the shaft and means conting it with said retardable part of the in; a se mratev gear train for rotating l sleeve, and a brake device for retarding 1 t ain.

nsmitting device, in rotating shaft and ecac thereon, a spur gear gournaled on the eccentric; an internal gear having a greater number of teeth than the spur gear meshing with the latter and journaled concentrically with the shaft; a trammel -(le-' vice for controlling the rotation of the spur gear about its own axis,and means for controlling the rotation of the trammel device about the axis of the shaft comprising a spiral gear pair, and means by which one about the axis of the shaft comprising a spiral gear pair; means by which one member of the pair is actuated by the trammel device, and means for controlling at will the other member of the pair. 7

In testimony whereof, I have hereunto set my hand at Chicago, Illinois, this 4th day of September, 1915.

WILLIAM P. ALLEN.

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