US1076299A

US1076299A - Fluid-motor.

Info

Publication number: US1076299A
Application number: US76466213A
Authority: US
Inventors: William E Marshall; Martin Marshall
Original assignee: Individual
Current assignee: Individual
Priority date: 1913-04-30
Filing date: 1913-04-30
Publication date: 1913-10-21
Anticipated expiration: 1930-10-21

Description

Patented 00t .21,1913,

2 SHEETS-SHEET l.

W. E. & M. MARSHALL.

FLUID MOTOR.

APPLICATION FILED APR. 30, 1913.

'3 7% W Inventors W. B. & M. MARSHALL. FLUID MOTOR.

APPLICATION FILED APR. so, 1913.

1,076,299. Patented 0ct.21, 1 913.

I 2 BHEETS-BHEET 2.

UNITED snares PATENT OFFICE.

WILLIAM E. MARSHALL AND MARTIN MARSHALL, OF MASPETH, NEW YORK.

FLUID-MOTOR.

Application filed A ril 30, 1913. Serial No. 764,662.

Specification of Letters Patent.

Patented Oct. 21,1913.

i To allwhomit may concemi;

Be it known that we, WILLIAM E. MARI Improvements in Fluid-Motors, of which the following is a specification.

This invention relates to an expansible fluid motor, and its novelty consists in the construction and adaptation of the parts, as will be more fully hereinafter pointed out. It comprises briefly two series of inter meshing vanes each series adapted to revolve m opposite directions on a central shaft through which the actuating fluid is supplied. There are 'ports between each pair of vanes adapted to register with the supply ports of the central hollow shafts and intermediate cylindrical adjusters between such supply ports and the vane ports, an outside shell or casing within which the series of vanes revolve and various adjunctsand connections, as will be more fully hereinafter described.

In the drawings, Figure 1 is a front elevation in miniature of a device embodying the invention; Fig. 2is a side view of one of the central hollow shafts; Fig.3 is a section on theplane of the line 33 in 6 and a side elevation of the adjuster bridge; Fig.4 is a transverse section on the plane of the line 4-4 in Fig. 2; Fig. 5 is a central longitudinal vertical section showing the parts in position when steam is being admitted through the left series of vanes; Fig. 6 is a top plan view and partial horizontal section on the plane of the line 66 in Fig. 8; Fig. 7 is a view similar to Fig. a showing the parts in position when steam has been admitted to the left series of vanes and the vanes have been rotated farther than is shown in Fig. 5; Fig 8 is a view In the drawings, 10.is,a casing or shell ada ted to contain the v'anes, ad usters and shafts. It is provided with outlet ports 100' and with two

steam pipes

20 and 30 communicating with a source of steam (not shown) and which pipes lead into two centrally arranged

hollow shafts

21 and 31 secured transversely across the casing 10 and capable of a limitedcircular movement. The shaft 21 is provided with a port 22 and the shaft 31 with a port 32, and outside of the casing 10 the shafts have made integral therewith or rigidly secured thereto,

spur gears

23 and 33 respectively, which both mesh with an intermediate rack 13 suitably supported outside of the casing 10 and which is moved by. suitable means as a handle 14, wher'eby'both of the

gears

23 and 33 may be circularly adjusted and with them the

shafts

21 and 31, but in 0pposite directions.

Closely fitting over the shaft 21 is a segmental cylindrical adjuster 24 which is circularly adjustable with respect to a bridge 25, which is fixed in position between the segmental edges of the adjuster and is secured to, or made integral with, the pipe 20. Similarly over the shaft 31 is a segmental cylindrical adjuster 34 movable with respect to a. bridge 35. Eachadjuster 24 and 34 is provided with a spur gear 26' and 36 made integral therewith, or rigidly secured thereto, and each of which meshes with an inter mediate rack 16 provided with an actuating handle 17. The adjuster 24 has two ports, an upper port 27 and a lower one 28, and similarly the adjuster 34 has two

ports

37 and 38. It will be understood that by circularly moving the

adjusters

24 and 34 with respect to the bridges 25 and '35 the size of the ports bet-ween the adj uster and the bridge may be varied on each side of the bridge. The

several gears

23 and 33, and 36 and 26 are each slotted as indicated in Fig. '4 to permit of the passage through them of the bridges 25 or '35 and to give a slight clearance beyond such bridge and permit of the circularadjustment of the two devices.

Arranged externally to each

adjuster

24 and 34 and adapted to revolve thereon as upon a shaft, are the

motor shells

200 and 300 respectively, each comprising a

cylindrical body

201 and 301 with radially exand each made up of four curved surfaces,

namely, two outwardly bending curves (1 and b and two inwardly bending curves 0 and d so that each vane has in cross section the general shape of the tooth of a gear. These two shells made up of series of vanes are adapted to revolve and their paths are such and they are so arranged that the path of the extremity of each vane (which extremity is formed by the intersection of the curves a and b) as it moves around its center is in contact with the curves 0 and d of the vanes of the opposing shell, and at other parts of its. path such extremity is in contact with the inner surface of the outside casing 10 during a portion of its revolution.

Secured to, or made integral with, each of the

bodies

201 and 301 are two

external gears

303 and 203, and 204 and304 arranged in pairs on opposite sides of the casing and adapted to mesh with each other. These form a synchronizing device to cause the intermeshing vanes to move together uniformly and steadily. The gears are connected to any suitable kind of power-transmit ting mechanism, either by shafts on which they are secured or gearing with which they mesh or otherwise to transmit the energy of the motor to any machine or place where it is to be utilized.

The operation of the device is as follows; Assuming that the parts are in the positions shown in Fig. 5, steam is being admitted from the pipe 30 through the port in the hollow central shaft 31 and the upper port 37 in the adjuster 34: and the port between two of the vanes of the left series into the pocket formed between the two intermeshing vanes at that place. The steam will expand and will cause a movement of the two series in opposite directions, as indicated by the arrows. The movement is in this direction because by moving in this direction the size of the pocket into which the steam is introduced 15 increased rather than diminished. In Figs. .7, 8 and 9 are shown successive positions of the several vanes as the steam continues to be admitted and cut off by the positions of the circular adjusters and the inner central hollow shafts. As the vanes continue to revolve the ports between two successive vanes are caused to pass by the corresponding ports in the adjuster and are cut off from the central shaft depending upon the position of the adjuster with respect to the bridge. It will be understood that this operatioirwould take place if the adjuster were omitted, its particular function being for the purpose of preventing the motor from stalling on a dead center, such prevention being accomplished by an adjustment of the' device with respect to its bridge. As the vanes continue to revolve the steam from the left is cut oif and that from the right is admitted, so that the operation of the device is such that steam is admitted alternately from the left and right central hollow shafts, and a continued propulsion of both series of vanes takes place. After the vanes of the two opposing series have so moved that the pocket to which steam has been admitted is opened and the steam is allowed to pass from such pocket to the space between the vanes and the outer casing 10 (as shown for example, in Fig. 8) a second expansion of the steam takes place within this larger space and there is a further propulsion of the vanes. The reverse of the motor is accomplished by moving the central hollow shafts so that their supply ports coincide with the lower ports of the adjusters and steam is admitted through such ports to the pockets below the horizon-- tal center of the device. After the motor has started in this direction its operation is obviously the same as before. After the ro' tation of the vanes has brought a body of the steam beyond the pocket formed between the revolving vanes and the innercasing, the

steam can find an exit through the outlet ports as indicated and can be further used in another motor, or discharged into the at mosphere, or otherwise disposed or asmay be deemed expedient.

There will necessarily be some vibration or impulse in a device of this kind where the actuating fluid. is alternately supplied from different sides of'intermesh'ihg parts.

.In order to prevent this the

intermeshing gears

203 and 303 and 204 and 304 are provided, and by means of their contact and engagement a regular uniform movement is insured and excessive vibration is prevented.

The adjustment of the central

hollow shafts

21 and 31 is effected by means of the rack 13 and its handle 14, and the adjustment of the two

adjusters

34 and 24 is effected by means of the rack 16- and its handle 17.

What I claim is:

l. A motor, comprising two revolving shells having series of intermeshing vanes that revolve in opposite directions, each vane of one set operating in the space be-. tween the adjacent vanes of the other set, completely bridging the outer portion of such space and forming within the three a closed pressure chamber, and means for introducing fluid under pressure through the shells successively to the chambers while so closed.

2. A motor comprising two revolving shells having tubular axles provided with series of inter-meshing vanes that revolve in opposite directions, each vane of one set operating in the space between the adjacent vanes of the other set, and means for introducing fluid under pressure through the tubular axles into the spaces.

3. A motor comprising two revolving acrea e shells having tubular axles provided with series of intermeshing vanes that revolve in opposite directions, each vane of one set operating in the space between adjacent vanes of the other set, means for introducing fluid under pressure through the tubular axles into the spaces, and'means within the axles for controlling the-motive fluid.

4. A motor comprising two revolving shells having tubular axles provided with series of intermeshing vanes that revolve in opposite directions, each vane of one set operating in the space between adjacent vanes of the other set, means for introducing fluid under pressure through the tubular axles into the spaces, and means within the axles for reversing the supply of motive fluid to reverse the direction of rotation of the shells.

5. In a device of the character described, the combination with a cylindrical shell of radially extending vanes, each having the general shape of a gear tooth in cross section, the vanes being symmetricallydisposed around a common center, and means for admitting steam between the vanes consisting of a port or ports in the shell between the bases of each pair of vanes,

6. A motor comprising two series of intel-meshing vanes adapted to revolve in op- POSIlTE directions, and means for supplying steam to the-spaces, between the contacting vanes while they are in contact consisting of steam conduits located centrally with respect to each series and ports leading therefrom to the space between the vanes in both series. 7

7. A motor comprising two seriesof intermeshing vanes adapted to revolve in opposite directions, and means for supplying steam to the spaces between the contacting vanes while they are in contact consisting of steam conduits located centrally with respect to each series and ports leading therefrom to the space between the vanes in both series, and means for cutting off the steam from such ports.

8. A motor comprising two series of intermeshing vanes adapted to revolve in opposite directions, and means for supplying steam to the spaces between the contacting vanes while they are in contact consisting of steam conduits located centrally with respect to each series and ports leading therefrom to the space between the vanes in both series, and means for cutting off the steam from such ports consisting of an apertured shell arranged intermediate the steam conduit and vanes of each series.

9. A steam motor comprising a central hollow shaft communicating with a source of steam supply and provided with one or more ports for the exit of the steam, a cylindrical shell adapted to revolve on said shaft and provided with radial vanes in the general form of gear teeth and having a port between each pair of vanes, whereby as the shell revolves steam is admitted to the spaces between each pair of vanes as the port supplying such space coincides with a port in the hollow shaft.

10. A steam motor comprising a central hollow shaft communicating with a source of steam supply and provided with one or more ports for the exit of the steam, a cylindrical shell adapted to revolve on said shaft and provided with radial vanes in the general form of gear teeth and having'a port between each pair of vanes, whereby as the shell revolves steam is admitted to the spaces between'each pair of vanes as the port supplying such space coincides with a port in the hollow shaft, in combination with means for varying the efficient exit area of the hollow shaft port.

11. A steam motor comprising a central 'drical shell adapted torevolve on said shaft and provided with radial vanes in the general form of gear teeth and having a port between each pair of vanes, whereby as the shell revolves steam is admitted to the spaces between each pair of vanes as the port supplying such space coincides with a port in the hollow shaft, in combination with means for varying the ellicient exit area of the hollow shaft port consisting of an adjuster intermediate the shaft and the shell and which is adapted partially to close theshaft port. i

12. A steam motor comprising a central hollow shaft communicating with a source of steam supply and provided with one or more ports for the exit of the steam, a cylinlowshaft port consisting of an adjuster intermediate the shaft and the shell provided with ports adapted to register with the shaft port and which may be moved to partially close the same. I

13. A steam motor comprising a central hollow shaft communicating with a source of steam supply and provided with one or more ports for the exit of the steam and which shaft is capable of a limited circular adjustment, a cylindrical. shell adapted to revolve on said shaft and provided with radial vanes in the general form of gear teeth and having a port between each pair of vanes, whereby as the shell revolves steam noraaee hollow shaft communicating with a source of steam supply and provided with one or more ports for the exit of the steam and which shaft is capable of a limited circular adjustment, a cylindrical shell adapted to,

revolve on said shaft and provided with radial vanes in the general form of gear teeth and having a port between each pair of vanes, whereby as the shellrevolves steam is admitted to the spaces between each pair of vanes as the port supplying such space coincides with a port in the hollow shaft, in combination with means for varying the efii cient exit area of the hollow shaft port.

15. A steam motor comprising a central hollow shaft communicating with a source of steam supply and provided with one or more ports for the exit of the steam and which shaft is capable of a limited circular adjustment, a cylindrical shell adapted to revolve on said shaft and provided with radial vanes in the general form of gear teeth and having a port between each pair of vanes, whereby as the shell revolves steam is admitted to the spaces between each pair of vanes as the port supplying such space coincides with a port in the hollow shaft, in

combination with means for varying the effi cient exit area of the hollow shaft port consisting ofan adjuster intermediate the shaft and the shell and which is adapted partially 'to close the shaft port.

16. A steam motor comprising a central hollow shaft communicating with a source of steam supply and provided with one or more ports for the exit of the steam and which shaft is capable of a limited circular adjustment, a cylindrical shell adapted to revolve on said shaft and provided with radial vanes in the general form of gear teeth and having a port between each pair of vanes, whereby as the shell revolves steam is admitted to the spaces between each pair of vanes as the port supplying such space coincides with a port in the hollow shaft, in combination with means for varying the efficient exit area of the hollow shaft port consisling of an adjuster intermediate the shaft and the shell provided with ports adapted to register with tlie'sl'iaft port and which may be moved to partially close the same.

17. A motor comprising two series of in tcrmrsbing *anes adapted to revolve in opposite directions, and means for supplying steam to the spaces between the contacting vanes while they are in contact, acasing adapted to iuelose both series of vanes and arranged to contact with the edges of the anes for a portion of their travel after 2M;- -ease to inter-mesh and being spaced from {ill} edges of the vanes at the point they cease to intermesh to permit the steam to escape into thecasing and operate against the oppositely moving preceding vanes.

18. A steam motor comprising two series of oppositely revolving intermeshing vanes that successively form separate enlarging pressure chambers between them, means for supplying steam to the said pressure chambers between the contacting vanes while they are intermeshed, and which steam escapes into the'space between the series of vanes as the intermeshing of one vane of each series with a pair of the opposite series ceases, in combination with means for further utilizing the expansion power of such steam comprising casing walls that are out of contact with the tips of the vanes at the point said vanes, cease to mesh, and are in contact at other points.

19. A steam motor comprising two series of oppositely revolving intermeshing vanes, means for supplying steam to the spaces between the contacting vanes while they, are

intermeshed, and which steam escapes into the. space between the series of vanes as the intermeshing of one vane of each series with a pair of the opposite series ceases, in combination with means for further utilizing the expansion power of such steam which consists in surrounding each series of vanes with a jacket, the inner surface of which is out of contact with the teeth at the point where they cease to intermesh and in contact with the extremities of the vanes during an appreciable portion of their revolution after they are out of intermeshing relation.

20. A motor comprising two series of intermeshing vanes adapted to revolve in opposite directions, and means for supplying steam to the spaces between the contacting vanes while they are in contact including a central hollow shaft for each series, and which shafts have a limited circular movement,

21. A motor comprising two series of intermeshing vanes adapted to revolve in opposite directions, and means for supplying steam to the spaces between the contacting vanes while they areiin contact including a central hollow shaft for each series, and

which shafts have a limited circular movement, in combination with means for moving the shafts in opposite directions.

22. A motor comprising two series of intermeshing vanes adapted to revolve in opposite directions, and means for supplying steam to the spaces between the contacting vanes while they are in contact including a central hollow shaft for each series, and which shafts have a limited circular movement, incombination with means for moving the shafts in opposite directions and sinniltaneously.

23. A motor comprisingtwo series of intermeshing vanes adapted to revolve in opposlte directions, and means for supplying steam to the spaces between the contacting vanes while they are in contact, including a central hollow shaft for each series, and which shafts have a limited circular movement, in combination'with means for moving the shafts in opposite directions and simultaneously, comprising a gear se cured to, or made integral with, each shaft and a common toothed member adapted to' move both gears.

24. A motor comprising two series of iIl-' termeshing vanes adapted to revolve in opposite directions, and means for supplying steam to the spaces between the contacting vanes while they are in contact, including a central hollow shaft for 'each series, and

' which shafts have a limited circular movement, in combination with means for moving the shafts in opposite directions and simultaneously, comprising a gear secured to, or made integral with, each shaft and a common rack by which both shafts may be moved. r v

25. A motor comprising two series of intermeshing vanes adapted to revolve in opposite directions, and means for supplying steam to the spaces between the contacting vanes while they are in contact, including a central hollow shaft-for each series, and which shafts have a limited circular movement, in combination with means for moving the shafts in opposite directions and simultaneously, comprising a gear secured to, or made integral with, each shaft and a common rack by which both shafts may be moved and which rack is provided with an actuating handle.

26. A motor comprising two series of intermeshing vanes, steam supplying ports, one between each ipair of vanes, means for varying'the out o of all the ports including an adjusting member having a limited circular movement, one foreaoh series of vanes.

27. A motor comprising two series of intermeshing vanes, steam supplying ports, one between each pair of wines, means for varying the out off of all the ports including an adjusting member having a limited circular movement, one for each series of vanes I in combination with means for moving the in combination with means for moving adjusters in opposite directions.

28. A motor comprising two series of" intermeshing vanes, steam supplying ports,

one between each pair of vanes, means'for varying the cut oil? of all the ports including an adjusting member having a limited-circular movement, one for each series of vanes the adjusters in opposite directions and simultaneously.

29. A moto r comprising two series of intermeshlng vanes, steam supplyingports,

common toothed member adapted to move bot-h gears.

30. A motor comprising two series of intermeshing vanes, steam supplying ports, one-between each pair of vanes, means for :varying the cut off of all the ports including an adjusting member having a limited cir-' cular movement, one for each series of vanes in combination with means for moving the adjusters in opposite direct-ions and simultaneously comprising a gear secured to, or made integral with, each adjuster and a common rack by which both adjusters may be moved.

31. A motor comprising two series of intermeshing vanes, steam supplyingport's, one between each pair of vanes, means for varying the cut oil of all the ports including an adjusting member having a limited circular movement, one for each series of vanes in combination with means for moving the adjusters in opposite directions and simultaneously comprising a gear secured to, or made integral with, each adjuster and acommonrackby which both adjusters may be moved, and which rack is provided with an actuating handle.

32. A motor comprising two series of intermeshing vanes adapted to revolve in op one between each pair of vanes, two central hollow shafts, one foreach series of vanes,

each of which shafts has a limited circular movement, two adjusting devices, one for each series, intermediate the vaneports and the steam supplying ports, and each of which adjusting devices have a limited circular movement with respect to a centrally arranged bridge whereby if the central hollow shaft is moved so that its port coincides with one side of the bridge the motor moves forward, and if itis moved to coincide with the op osite side of the bridge the motor moves Backward.

33. A motor comprising two series of intermeshing vanes adapted to revolve in opposite directions, steam supplying-ports, one between each pair of vanes, two central hollow shaft-s, one for each series of vanes, each of which -shafts has a limited circular move ment, two adjusting devices, one for each series, intermediate the vane ports and the steam supplying ports, and each of which adjusting devices has a limited circular movement with respect to a centrally arrgngted bridge whereby if the central hollow s a is moved so that its port coincides with one side of the bridge the motor moves for ward, and if it is moved to coincide with the opposite side of the bridge the motor moves backward, and means for moving the hollow shafts simultaneously.

movement with respect to a centrally arranged bridge whereby if the central hollow shaft is moved so that its port coincides with one side of the bridge the motor moves forward, and if it is moved to coincide with the opposite side of the bridge the motor moves backward, and means for moving the hollow shafts simultaneously comprising a gear secured to, or made integral with, each shaft and a common toothed member adapted to move both gears.

35. A motorcomprising two series of intermeshing vanes adapted. to revolve in op- .posite directions, steam supplying ports, one

i not between each pair of vanes, two central hollow shafts, one for each series of vanes, each of which shafts has a limited circular move ment, two adjusting devices, one for. each series, intermediate the vane ports and the steam supplying ports, and each of which adjusting devices has a limited circular movement with respect to a centrally arranged bridge whereby if the central hollow shaft is moved so that its port coincides with one side of the bridge the motor moves forward, and if it is moved to coincide with the opposite side of the bridge the motor moves backward, and means for moving the hollow shafts simultaneously comprising a gear secured to, or made integral with, each shaft and a common rack by which both shafts may be moved.

86. A motor comprising two series of intermeshing vanes adapted to revolve in opposite directions, steam supplying ports, one between each pair of vanes, two central hollow shafts, one for each series of vanes, each of which shafts has a. limited circular movement, two adjusting devices, one for each series, intermediate the vane ports and the steam supplying ports, and each of which adjusting devices has a limited circular movement with respect to a centrally arranged bridge whereby if the central hollow shaft is moved so that its port coincides with one side of the bridge the motor moves forward, and if it is moved to coincide with the opposite side of the bridge the motor moves backward, and means for moving the hollow shafts simultaneously comprising a gear secured to, or made integral with,each

shaft and a common rack by which both low shafts, one for each. seriesof vanes, each of which. shafts has a limited circular movement, two adjusting devices, one for each series, intermediate the vane ports and the steam supplying ports,'and each of which adjusting devices has a limited circular movement with respect to a centrally arranged bridge whereby if the central hollow shaft is moved so that its port coincides with one side of the bridge the motor moves forward, and if it is moved to coincide with the opposite side of the bridge the motor moves backward, and means for moving the hollow shafts simultaneously; and separate means for moving the adjusting devices simultaneously.

88. A motor comprising two series of intermeshingvanes adapted to revolve in opposite directions, steam. supplying ports, one between each pair of vanes, two central hollow shafts, one for each series of vanes, each of which shafts has a limited circular. movement, two adjusting devices, one for each series, intermediate the vane ports and the steam supplying ports, and each of which adjusting devices has a limited circular movement with respect to a centrally arranged bridge whereby if the central. hollow shaft is moved so that its port coincides with 1 one side of the bridge the motor moves forward, and if it is moved to coincide with the.

opposite side of the bridge the motor moves backward, and means for moving the hollow shafts simultaneously and separate means for moving the adjusting devices simultaneously comprising a gear secured to, or made integral with, each adjusterand a common toothed. member adapted to move both gears.

39. A motor comprising two series of intermeshing vanes adapted to revolve in opposite directions, steam supplying ports, one between each pair of vanes, two central hollow shafts, one for eachseries of vanes, each of which shafts has a limited circular movement, two adjusting devices, one for each series, intermediate the vane ports and the.

steam supplying 'ports, and each of which adjusting devices has a limited circular movement with respect to a centrally arranged bridge whereby if the central hollow shaft is moved so that its port coincides with one side of the bridge the motor moves forward, and if it is moved to coincide with the opposite side of the bridge the motor moves backward, and means for moving the hollow shafts simultaneously and separate means for moving the adjusting devices si multaneously comprising a gear secured to, or made integral with, each adjuster and a common rack by which both adjusters may be moved; a

40. A motor comprising two series of intermeshing vanes adapted to revolve in opposite directions, steam supplying ports, one between each pair of vanes, two central hol low shafts, one for each series of vanes, each of which shafts has a limited circular movement, two adjusting device's, one for each series, intermediate the vane ports and the steam supplying ports, and each of which adjusting devices has a limited circular movementwith respect to a cent-i ally arranged bridge whereby it the central hollow shaft is moved so that its port coincides with one side of the bridge the motor moves forward, and if it is moved to coincide with the opposite side of the bridge the motor moves backward, and means for moving the hollow shafts simultaneously and separate means for movin the adjusting devices simultaneously comprising a gear secured to, or made integral with, each adjusted and a common rack by which both adjusters may be boxed, and which rack is provided with an actuating handle.

41, A motor comprising two series of intermeshing vanes adapted to revolve in opposite directions, steam supplying ports, one between each pair of vanes, two central hollow shafts, one for-each series ofvanes, each of which shafts has a limited circular movement, two adjusting devices, one for each series, intermediate the vane ports and the steam supplying ports, and each of which adjusting devices has a limited circular movement with. respect to a centrally arranged bridge whereby it the central hollow termeshing vaiies adapted to revolve in opposite directions, steam supplying ports, one between each pair of vanes, two central hollow shafts, one for each series of vanes, each of which shafts has a limited circular movement, two adjusting devices, one for each series, intermediate the vane ports and the steam supplying ports, and each of which adjusting devices we a limited circular movement with respect to a centrally arranged bridge whereby if the central hollow shaft is moved so that its port coincides with one side of the bridge the motor moves forward, and if it is moved to coincide with the opposite side of the bridge the motor moves backward, and means for moving the hollow shafts simultaneously, and separate means for moving the adjusting devices simultaneonsly and means for synchronizing the movements of the two series of vanes consisting of two intermeshing gears, one adapted to be rotated from each'series of vanes. i

In testimony whereot we afix our signa tures in presence of two witnesses. 4

WILLIAM MARSHALL. MARTIN MARSHALL, Witnesses:

MARY H. LEWIS, Cnannnon G. CAMPBELL.