US795641A - Speed-controlling device for hoisting machinery. - Google Patents

Description

'm.zv95,e4.1. PATBNTBD JULY 25, 1905. J. MOGEORGE.

SPEED CONTROLLING DEVICE FOR-HOISTING MACHINERY. APHIJIOATION FILED OUT. 16,1903,

3 SHEETS-SHBBT 1.

No. 795,641. PATBNTED JULY 25, 1905.

J. MOGBORGE. SPEED CONTROLLING DEVICE FOR HOISTING MACHINERY.

APPLICATION FILED OOT. 16.1903.

3 SHEETS-$33131 2.

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No. 795,641. PATENTBD JULY 25, 1905. J. MOGEORGE.

SPEED CONTROLLING DEVICE FOR HOISTING MACHINERY.

APPLICATION FILED 00w. 16,1903.

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McGEORGE, OF CLEVELAND, OHIO, ASSIGNOR TO THE ELECTRIC CONTROLLER & SUPPLY COMPANY, OF CLEVELAND, OHIO, A CORPO- RATION OF OHIO.

SPEED-CONTROLLING DEVICE FOR HOISTING MACHINERY,

Specification of Letters Patent.

Patented uly 25, 1905.

Application filed October 16, 1903. Serial No. 177,283.

To all whom it may concern:

Be it known that I, JOHN McGnoRGn, acitizen of the United States, residing in Cleveland, Ohio, have invented certain Improvements in Speed-Controlling Devices for Hoisting Machinery, of which the following is aspecification.

My invention relates to certain improvements in systems designed to operate automatically to hoist and lower skips or bucketsas, for example, in connection with the charging of blast-furnaces.

The object of the invention is to provide a relatively simple system which while operating to a great extent mechanically shall start a load from rest, bring it up to full speed, and then bring -it to rest with a minimum expenditure of energy as well as with a minimum strain on the hoisting apparatus.

A further object of' the invention is to provide mechanism operated as above noted which may be driven by acontinuously-oper ating motor.

These objects I attain as hereinafter set forth, reference being had to the accompanying drawings, in which- Figure 1 is a side elevation of the apparatus constituting my improved system. Fig. 2 is an end elevation of the mechanism shown in Fig. 1. Fig. 3 is an end view, partly in section, showing the detail construction of one of the magnetic clutches and of a portion of the gearing. Fig. 4 is a diagrammatic view illustrating the electrical connections of the clutches, brake, and automatic switch employed in my new system.

In the above drawings, A illustrates the motor for providing the motive power of the apparatus, and while this is shown as an electrical machine it is to be understood that it may be replaced by any desired form of the continuously-operating motor, such as a steamengine, waterwheel, or gas-engine. The armature-shaft of the electric motor illustrated is provided with a beveled pinion a, and this meshes with two independent beveled gears a and a which are loosely supported upon a shaft B. This shaft is carried in suitable bearings, as shown, and has keyed to it two electromagnetic clutches o and I), by which either of the gears a or a may be operatively connected to said shaft B. A train of gears composed of toothed wheels 1, 2, 3, and 4 spindles e.

operatively connect the shaft B with a shaft C, upon which is loosely carried a hoistingdrum C of the well-known form.

The shaft B has fixed to it a braking-disk and from the center of said friction-disk and so placed that its'periphery bears upon the plane surface of said disk. A lever-arm d, fixed to a shaft 03?, engages the slidable wheel d, so that as said shaft is turned said wheel is moved upon its supporting-shaft D toward or from the center of the disk 6 pose of actuating the shaft (Z a pinion-c is provided, which is keyed to the shaft C, and this mesheswith the toothed wheel 0', having a cam-race, as indicated in dotted lines in Fig. 1 at 0 A roller 03*, carried on an arm (Z3, is in engagement with said cam-race, and said arm is fixed to the shaft d As shown in Fig. 3, the hoisting-drum C has bolted to it a beveled gear-wheel 0 and the shaft C has keyed to it a similar beveled gear-wheel 0*, while between this latter and the gear-wheel of the hoisting-drum is a wormwheel E, loosely supported upon the shaft C and carrying three beveled pinio1ise,supported so as to be free to rotate upon radially-placed These pinions mesh both with the gear-wheel c and with the gear 0 and a worm d carried by the shaft D, meshes with the worm-wheel E.

There is upon the gear-wheel c a projection 0 so placed as to periodically engage a pivotally-placed switch-arm f, belonging to a switch F, suitably supported on the foundation of the structure. This switch, as shown in Figs. 1 and 4, consists of three plates f, f and f arranged on two concentric arcs, so that while the switch-arm f always remains in contact with the plate f 3 it will engage either of the contact-plates f or f according as it is moved to one or the other side of its mid-position. While I preferably employ the form of electric switch shownin For the purthe drawings, it is to be understood that by the term switch, as used in the claims, I

desire to include any device for controlling the beveled pinion a and consequently also turns both of the beveled gears co and (0 though in opposite directions. In starting the device the switch-arm f is moved by hand from its central position, so that it forms electrical connection, for example, between the contact-plates f and f current being then permitted to flow from the main g" through the switch-arm f to the magnet of the clutch 6, through the brake-magnets b and back to the main g. This results in the weight 6* being lifted, so as to cause the brakeband to release the disk and simultaneously clutches the beveled gear-wheel b to-the shaft B. Power is then transmitted from said shaftthrough the train of gears 1 2 3 4 to the shaft C and to the bevel gear-wheel 0*, keyed The friction-disk If is also rotated:

thereon. by the shaft B and in turn causes rotation of the shaft D at a relatively high speed-through the medium of the wheel 61, which in Fig. 3

is shown as hearing on thesurface of said friction-disk at a point relatively distant from the center thereof. shaft D turns the worm-wheel E throughthe medium of the worm (Z and byproper design said worm-wheel will turn in :the same direction as that of the beveled gear-wheel 0. With suitable proportioning of the various parts the worm-wheel may be given 'such a rate of rotation that the-beveled pinion 6, carried thereby, will simply roll uponthe bevelgear 0, and consequently no motion will be' transmitted to the hoisting-drum G. It will be seen from Fig. 1, however, that as the toothed wheel 0 is turned the cam-race 0 causes the arm d to be moved outwardly or toward the periphery of saidgear, thereby turning the shaft d and through it the arm cZ, so as to move the wheel (Z toward the center of rotation ofthefriction-disk d This naturally results in a slowing'down of the speed of rotation of the shaft D, and consequently also of the worm-wheel E, so by the time the wheel cl is at the center of the fric-- tion-disk the worm-wheel is prevented from moving and the hoisting-wheel C is turned, through the medium of the pinions eand of the bevel-gear 0 at the same speed as that of the bevel gear-wheel 0*. It will be noted which is geared thereto.

Revolution of the from Fig. 1- that a-great'portion of the cam race 0 is concentric with the center of.rotation ofthe gear-wheel 0" so that the wheel 03 is at the center of the fllClllOl'lrdlSk, with the worm-wheel E held from revolution for a relatively long though predetermined time. Finally, however,'-the= position of the cam- .race is changed so as to again swing the arm (Z toward the center of revolution ofthe gearwheel 0, thereby again returning the wheel d to engagement with the periphery of the friction-disk and gradually speeding up the wormwheel e froma condition ofrestuntil it turns at such a-ratethat no motion is transmitted from-thegear-wheel a to the gear-wheel 0 the hoisting-drumbeing gradually, brought to a position of rest. Just prior to complete cessation of the-movement of the hoistingdrum the projection 13 on the gear-wheel c engages the switcharm f.=and::returns it to its central or-inactivc-position thus releasing theclutch b on thebevel-gear a andvsimulvtaneously demagnetizing-..the brake-magnets b, with the result thatthe weight 6* ispermitted to act and apply the brake-band to the brake-disk, thereby preventing further rotation either of :the. shaft B- or of the shaft C, 1 Motionof the switch-arm fin the opposite directionl energizes themagnet of the clutch b= and simultaneously releasesthe brake, so thatthe above cycle of operations is repeated, the drum 0,

however, being turned in-the oppositedirection from tha-tpreviouslydescribed.

From the above it will be seen that Lam enabled tooperate from a constantly-running motor a hoisting-drum which isgradually speeded up to a maximum velocity; at which it is-maintained for a predetermined :time, after which said drum is automatically slowed 4 down, the motor being then disconnected and the drum held from turning. These operations are accomplished by the employment of relatively simple mechanical structures and without-complexity of electricalapparatus or wiring such as has-hitherto been-considered necessary.

I claim as my invention 1. The combination of a-continuously-operating motor, a structure driven thereby, a switch, an electrically-actuated clutch incircuit with the switch and connecting said motor with the driven structure,'a brake and automatic means opera-tedfrom said driven structureconstructed to mechanically actuate the switch to effect the action of the clutch and of :the brake, -substantially as described.

2. The combination of a motor a driven structure, means including a clutch for connecting said structure and the motor, and means for automatically'varying the speed of the driven structure independently of-the motor, a brake and electrical:apparatusefor controlling the clutch and i the brake, with means actuated by the motor for operating said electrical apparatus, substantially as described.

3. The combination of a motor, a driven structure, means including a clutch for connecting said structure to the motor, a brake constructed to retard movement of the driven structure at any point of its operation, an electric switch having automatic controlling means actuated from the motor, and connections between the switch, the clutch and the brake arranged to cause release of the clutch and immediate application of the brake when the switch is operated, substantially as de scribed.

4. The combination of a motor, a driven structure, means including a magnetic clutch forconnecting said two members, an electromagnetic brake constructed to retard movement of the driven structure immediately upon the cessation of current-flow, a switch connected to the clutch and the brake, with means for automatically operating the switch to cause release of the clutch and the subsequent immediate application of the brake, substantially as described.

5. The combination of a motor, a driven structure, means including a plurality of magnetic clutches for connecting said two members, an electromagnetic brake, and a switch in circuit with the clutches and the brake, said driven structure including a part placed to open the switch after said structure has been operated to a predetermined extent, with means for changing the speed'of the driven structure relatively to the speed of the motor, substantially as described.

6. The combination of a motor, a driven structure, means including a clutch and differential gearing for operatively connecting said two members, means for applying and releasing said clutch, and an automatically-.

operating device acting upon said differential gearing to vary the speed of the driven structure, substantially as described.

7. The combination of a continuously-operating motor, a structure to be driven, means including differential gearing connecting said two members, with means operative upon said differential gearingfor varying the speed of said driven structure, an electromagnetic clutch, a brake, and an electrical device for simultaneously causing operation of the clutch and application of the brake, substantially as described.

8. The combination of a motor, a driven structure, a shaft connected to said structure, two wheels loosely carried thereon and driven in opposite directions by the motor, a pair of magnetic clutches for respectively connecting either of said wheels to the shaft, an electromagnetic brake, an electric switch in circuit both with the clutches and with the brake,

with .means operated by the motor for con- I trolling the switch, substantially as described.

9. The combination of a continuously-operating motor, with a structure driven thereby, a clutch connecting the motor and the driven structure, a switch in circuit with said clutch and constructed to be actuated by some portion of the driven structure, with means for varying the speed of the driven structure relatively to that of the motor, substantially as described.

10. The combination of a continuously-operating motor, a structure driven therefrom, mechanism connecting the driven structure and the motor including a magnetic clutch, an automatic switch in circuit with said clutch, with mechanism automatically actuated .by the driven structure for varying the speed of the same independently of the motor, substantially as described.

11. The combination of a continuously-operating motor, a driven structure, mechanism connecting said two members including a magnetic clutch, a switch for controlling said clutch, a Wheel provided with a cam-surface and actuated from the motor, an arm having a portion in engagement with the cam-surface, and mechanism connected to said arm whereby the speed of the driven structure is antomat ically varied as the wheel having thecam-surface is turned, substantially as described.

12. The combination of a motor, a driven structure, With mechanism connecting said two members including a magnetic clutch,

'difierential gearing, a friction-wheel and a friction-disk, with means for controlling the operation of the clutch, and a device for automatically varying the position of the frictionwheel relatively to the friction-disk, substantially as described.

13. The combination of a motor,-a driven structure, differential gearing interposed between said structure and the motor, means including a pair of magnetic clutches for operating said driven structure in either direction at will, means for controlling the actuation of said clutches, with automatically-operated mechanism operative upon the differential gearing for varying the speed of the driven structure independently of that of the motor,

substantially as described.

In testimony whereof l-have signed my name to this specification in the presence of two subscribing witnesses.

JOHN MOGEORGE. Witnesses:

0. W. CoMsTooK, HERBERT P. GLIDDEN.

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