US1263125A - Speed-control mechanism for power-driven apparatus. - Google Patents

Description

H. SAWYER.

SPEED CONTROL MECHANISM FOR POWER DRIVEN APPARATUS.

APPLICATION FI LED AUG-16,1916

2 SHEETS-SHEET l.

H. SAWYER.

aSPEED CONTROL MECHANISM FOR POWER DRIVEN APPARATUS.

I ll "M @Hovmuz APPLICATION FILED AUG. 16. 1916- Patented Apr. 16, 1918..

5] vwawfoz A EY SAWYER, OF MUsKECoN, MICHIGANVASSIGNOR TO SHAW ELECTRIC CRANE,

* STATES PATENT Q G COMPANY, OF MUSKEGON, MICHIGAN, A CORPORATION OF MICHIGAN.

' v srEEn-oon'rnor. MECHANISM FOR, rowEE-nRIv NArrARAr s.

all whom, it may concern: Be it known thatI, I'IARRY I j citizen of the United States, residlng at Muskegon, in the county of Muskegon,

State of Michigan, have made a certain new and useful Invention in Speed Control Mechanism for Power-Driven -Ap'paratus, of which the following-is a specification.

This invention relates to speed control mechanism for power 7 driven' apparatus.

The objectof the invention .is to provide 'mechanism which is simple and eflicient for varying or controlling the speed at which hoisting or other power driven apparatus ma be operated. ther objects of the invention will appear more fully hereinafter.

-' The invention consists substantially in th v construction, combination, location and relative arrangement of parts, all as will be more fully hereinafterset forth, 'as shown I in the accompanying. drawings, and finally pointed out in the appended claims.

Referring to the drawings M Figure 1 is a view in top plan, parts broken out and,parts' in horizontal section, showing a speed control mechanism as applied to power. driven hoisting apparatus. Fig. 2 is a broken view in top plan, on a somewhat larger scale than Fig. '1, partslin horizontal section, showing a speed control gearing structure embodying the principles ofmy invention. v Fig. 3 is a view in vertical transverse section on the line 3, 3, Fig.2, looking in the direction of the arrows. I

The same part is'designated by the same it occurs pose to employ independent motors for ac:

tuating the apparatus to be driven and a gearing common to both motors and adapted to 'be operated by each, independently of the other, or con ointly by both for transmit- SAWYER, a

' Specification of LettersTatent. P t t Apr, 1 191 Application filed August s, 1916. Serial No. 115,201. 7

ting the driving power to the apparatus to.

be driven, and through the independent or conjoint operation of, which motors the desired speed variations are secured, and through which a Wider range of variations is attained than is possible from a single motor. 5

While a speed varying mechanism embodying my invention is adapted for use :which is to be power driven, and 5 is the main; power shaft from which the drum is driven through any desired intermediate gear connections, comprising in" the "ex ample. shown, the gearsfi, 7. These, however, are mere details and form no part of my present invention.

Power is applied from the motors 8, 9,

either independently ofor conjointly with each other, to, the shaft'5. In the particular formshown, to which, however, my invention is not to be limited or restricted, the motor 8 may. be regarded,'in this instance,

as the main hoist motor. Thismotor is suitably connected to drive a spur gear 10 which is encompassed by an internally toothed annular gear 11, which is driven from the motor 9. A carrier 12 is connected to rotate withtheshaft 5, and'upon's'a'id carrier are mounted pinions -13, capable of axial rotation upon pins 14* carried by the carrier 12. The pinions 13 are disposed between and mesh with the spur gear 10 and the internally toothed annular gear 11. In the particular form shown, to which, how-' ever, my invention ,is not to be limited or restricted, three pinions 13 are employed and they are circumferentially spaced at equal distances apart. This gear arrangement constitutes a planetary gear system through which the shaft 5, and hence, the

drum 4 is driven whether the ohe or the other or both motorsare in operation. Any suitable form of gearing may .be employed between the motor 9' and gear'll to drive the latter. In the form shown, to which, however, my invention is not to be limited or restricted, I employ a worm gear connection 14; for this purpose, one member of which is connected to the shaft of motor 9, and the other to the wheel 15, which carries the annular internally toothed gear 11. The advantage of this arrangement is i that where a worm gear is employed it is enabled to employ the friction of the worm gear or of its end thrust hearing, or the two combined, as a means to hold the worm gear from rotating While the spur gear 10 is being independently driven by the hoisting motor 8 without" the operation of the speed control motor 9. In other words, where it is desired to arrest the motor 9 and afi'ect th'espeed opera-tion solely from motor 8, then the friction of the worm gear and of its end thrust bearing is utilized to restrain the worm gear from rotation.

The operation is exceedingly simple. Suppose 'the motor 8 is in operation with the motor 9 standing still. In this case the spur gear 10 will be rotated while the internal gear 11 will be fixed. By reason oftne intermeshing of the pinions 13 with the rotating spur gear 10 and also with the fixed internal gear 11, said pinions are not only rotated axially but they also travel around within the internal gear 11, thereby imparting rotation. to their carrier 12, and hence to the shaft 5, and apparatus to be driven, and at a speed and in a direction dependent upon the speed and direction of motor 8,- and the gear ratios employed. On the other hand, if motor 8 is standing still and motor 9 is put into operation, then thespu'r gear 11 is rotated, thereby causing the pinions 13 to travel around the spur gear 10, and to r0- tate their carrier and the shaft 5 and hence the apparatus to be driven, at a speed and in a direction dependent upon the speed and direction of the motor 9, and the gear ratios employed. By using a wormgear connection between the motor 9 and internal gear 11, a very slow speed of operation of the apparatus to be driven may be attained. Hence, if desired, the motor 8 may be regarded as the speed motor and the motor 9 as the slow speed motor. By operating both motors 8 and 9 in unison in either direction a speed of operation of the apparatus to be driven is attained which equals the sum of the speeds of the motors if operated separately, and hence at a greater speed than is attained with either motor acting singly By'operating the two motors coincidentally but in relatively opposite directions a speed of operation of the apparatus to be driven is attained which equals the difference be tween the speeds which would be attained by the motors operating separately, thus attain ing a wide variation in the speed of operation. 7

It will be observed that the wheel 15 is not mounted directly on the shaft of pinion 10, but is mounted upon a sleeve 16, which is suitably mounted in fixed position in the easing-17, and the shaft of spur gear 10 extends longitudinally through said sleeve. T his construction relieves the spur gear shaft of any wear or friction due to side thrust imposed by the planetary gear system, and consequent loss of power, imperfect action, looseness of parts, and noisy operation of the planetary gears.

From the foregoing description it will be seen that fundamentally the essential characteristic of my invention is the application of a gear system which can be driven by either one or two motors or other sources of power, either one of which may be in operation and the other standing still, or both of them operating at the same time, if desired.

and either in the same or in relatively oppositedirections, thereby securing the desired range of speed variation, according to the character of work to be performed.

Variations and changes in the details may readily occur to persons skilled. in the art and still fall within the spirit and scope of my invention. I do not desire, therefore, to be limited or restricted to the exact details shown and described.

But having now set forth the objects and nature of my invention, and a construction embodying the principles thereof, what I claim as new and useful and of my, own invention, and desife to secure by Letters Patent is 1. In a speed control mechanism, the combination with a part to be driven, and a drive shaft therefor, of a carrier mounted on said shaft at one end thereof, pinions mounted on said carrier, a spur gear and an internally toothed gear, between which said pinions are positioned and with which they are meshed, a shaft arranged in line with the drive shaft and carrying said spur gear at the end thereof proximately to said carrier, a motor for driving said shaft, said internally toothed gear being journaled independently of said shaft, and an independent motor for driving said internally toothed gear.

2. In a speed control mechanism, the combination with a part to be driven, of a carrier connected thereto, pipions mounted thereon, a spur gear and an internally toothed gear, between which said pinions are positioned and with which they are meshed, a motor for driving said spur gear, a fixed bearing sleev'e, said internally toothed gear being journaled to rotate on said sleeve, and an independent motor for driving said internally toothed gear.

3. In a speed control mechanism, a part to be driven, a driving shaft therefor, a carrier mounted on said shaft to rotate therewith, pinions supported by said carrier, a spur gear, an independent shaft therefor, a motor for driving the spur gear shaft, an

internally toothed gear encompassing said my hand in the presence of the subscribin spur gear, said pinions being interposed be- Witnesses on this 18th day of July A. 1)., 10 tween and meshing with said spur gear and 1916. internally toothed gear, a worm gear c011- nectedto said internally toothed gear, and

an independent motor for driving said worm Witnesses:

gear. T. C. AKIN,

In testimony whereof I have hereunto set i W. B. BARKSTROM.

:IRY SAWYER.

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