US1383199A - Speed-controlling mechanism for load-lifting devices - Google Patents

Description

F. L. GORMLEY.

SPEED CONTROLLING MECHANISM FOR LOAD LIFTING DEVICES. APPLICATION FILED JULY 6, 1920.

1,383,199. PatentedJune-28, 1921.

3 SHEETS-SHEET l.

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F. L. GORMLEY.

SPEED CONTROLLING MECHANISM FOR LOAD LIFTING DEVICES. APPLICATION FILED JULY 6, 1920.

Patented J 11116 28, 192 L 3 SHEETS-SHEET 7.-

Inventor.- I'rank L.Gormle y,

by QI /Q k@,

F. L. GORMLEY. W SPEED CONTROLLING MECHANISM FOR LOAD LIFTING DEVICES.

APPLICATEON FILED JULY 6, 1920.

3 SHEETSSHEET 3- Patented June 28, 1921.

Fig.6.

Frank L. Gormlc UNITED STATES PATENT OFFICE.

FRANK L. GORMLEY, OF BROOKLINE, MASSACHUSETTS.

SPEEDCONTROLLING MECHANISM FOR LOAD-LIFTING- DEVICES.

Application filed July 6,

To all whom it may con/rem Be it known that I, FRANK L. GoRMLnY, a citizen of the United States of America, and a resident of Brookline, in the county of Norfolk and Commonwealth of Massachusetts, have invented certain new and useful Improvements in Speed-Controlling Mechanism for Load-Lifting Devices, of which the following is a specification.

This invention relates to speed controlling mechanism for load lifting devices such high speed screw jacks adapted to run down under the load and the object of the present invention is to provide means of a simple character which will effectually prevent the load being lowered too rapidly thus obviating accidents, jarring of the load and injury to the device itself.

The invention consists primarily of means for braking the operating mechanism sufiiciently to sustain the lifted load and providing additional frictional means for controlling the speed of the lowering which means will become operative when the braking means become inoperative.

The invention further consists in certain novel features of construction and arrangement of parts which will be understood readily by reference to the description of the drawings and to the claims to be hereinafter given.

For the purpose of illustrating the invention, one preferred form thereof is illustrated in the drawings, this form having been found to give satisfactory and reliable results although it is to be understood that the various instrumentalitios of which the invention consists can be variously arranged and organized and the invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and described, except as required by the scope of the appended claims.

Of the drawings:

Fi ure 1 represents a horizontal section of a ifting jack embodying the features of the present invention, the cutting plane being on line 1, 1, on Fig. 2.

Fig. 2 represents a vertical section of the same on line 2, 2, on Fig. 1.

Fig. 3 represents an elevation of the cover plate with the various actuating devices se- Specificauion of Letters Patent.

1920. Serial No. 394,358.

cured thereto, the operating shaft being cut in section.

Fig. 4 represents a horizontal section of the same on line 4, 4;, on Fig. 3.

Fig. 5 represents a vertical section on line 5, 5, on Fig. 4 showing the governor or speed retarding mechanism.

Fig. 6 represents an elevation of the same with a portion thereof broken away and showing the manually controlled brake mechanism.

Fig. 7 represents a section of the speed retarding device on line 7, 7, on Fig. 5.

Fig. 8 represents an elevation of the retarding device disk with one of the friction members thereon.

Fig. 9 represents an edge view of the retarding device disk, and

Fig. 10 represents an elevation ofdevice for controlling the action of the brake mechanism and said retarding device.

Similar characters indicate like parts throughout the several figures of the drawings.

In the drawings, 10 represents a suitable base supporting a stationary standard 11 over the outer periphery of which is fitted a movable sleeve 12, to the upper end of which is threaded a cap 13.

In the upper end of the standard 11 is mounted a nut 14 to which is threaded a lifting screw 15 having splined to its upper reduced end a bevel gear 16 with which meshes a bevel gear 17 formed upon or secured to a revoluble shaft or s indle 18, the outer end of which is provide with a suitable operating mechanism 19 of any well known construction.

Between the upper face of the bevel gear 16 and the inner face of the cap 13 are two annular plates 20, 21, between which are interposed a plurality of anti-friction members 22.

The movable member 12 is provided on one side with a flanged projection 2 1 having a removable plate 25 secured thereto by bolt 25*.

The plate 25 is provided with a bearing 26 for the spindle or shaft 18 and secured to the hub of the gear 17 is a ratchet wheel 27.

The bearing 26 extends through a cylin- Patented June 28, 1921.

drical boss 28 on the inner face of the plate 25 and on this boss 28 is loosely mounted the gear wheel 29 having secured to one face thereof a plurality of pawls 30 coacting with said ratchet wheel 27.

The gear 29. is provided with a plurality of projections 31 to the outer ends of which is secured a ring 32 between which and said gear the pawls 30 are positioned.

From the back of the free end of each pawl30 extends a lug 33 on which is disposed a helical spring 34 the outer end of which bears against one of the projections 31 and retains said pawls 30 in engagement with said ratchet wheel 27 under normal conditions.

Beneath the gear wheel 29 is a revoluble shaft 35 having secured thereto a pinion 36 meshing with said gear 29 and. driven thereby when the movable member 12 of the jack is being lowered.

The shaft 35 has also secured thereto a worm wheel 37 which meshes with a worm 38 revoluble in bearings 39 in the bracket 40 secured to the inner face of the removable plate 25 by screws 40*.

To the reduced end 41 of the worm 38 is secured a brake disk 42 with the periphery of which coacttwo brake members 43 pivoted at 44 to the-bracket 40.

The lower end of each brake member 43 is provided with a recess 45 in which is positioned one end of a helical spring 46 the opposite ends of said springs being disposed in the recesses 47 and 48 in the removable plate 25 and bracket 40.

-Between the lower adjacent ends of the brake members 43 is positioned a flat sided projection 49 formed upon the actuating lever 50.

A portion of the flat sided projection 49 is cylindrical and positioned in a cylindrical hole in the flange of the removable plate 25.

The springs 46 normally retain the brake members'in contact with the periphery of the disk 42 and prevent its rotation until the actuatinglever 50 is moved to cause said flat'sided projection 49 to separate said brake members 43 and remove them from contact with the disk 42.

The worm 38 is provided at its opposite end with a reduced end 51 to which is secured a disk 52 having diametral slots 53 formed in its inner face in each of which slots 53 is disposed the rib 53 of a slidable member 54 the outer end of which has a broad bearing flange 55 the outer face of which is curved to fit the cylindrical wall 56 of a chamber formed in the bracket 40.

Each rib 53 is provided with an open ended groove 63 into the outer end of which extends a projection 64 on the disk 52.

Between the end wall of the groove 63 and said projection 64 is disposed a helical spring 65 which normally retains the bearwall 56.

The removable cover plate 25 is provided with semi-cylindrical recesses 67, 68 into which portions of the speed retarding device and brake mechanism project.

When the cover plate 25 is removed from the flanged projection 24 all of the devices for controlling the lowering of the movable member 12 are removed therewith.

The worm shaft 71 has a reduced end 72 mounted in a bearing in the member 25 and consisting in part of a plurality of antifriction members adapted to take care of the end thrust of the worm 38 during the lowering of the jack.

The pitch of the worm 38 is such that during the rotation of the worm gear 37 rotary movement will be imparted to the shaft '71 and the disks .42, 52.

When the brake members 43 are removed from the brake disk 42, the jack is free to lower under its load.

In order to prevent the movable member of the jack lowering at an excessive speed under the weight of the load superimposed on the cap 13, a manually controlled retarding device is provided.

This retarding device consists of a collar 75 slidably mounted on the worm shaft 71 and having a cone-shaped end 76 coacting with the inclined surfaces 77 on the inner ends of the slidable members 54.

These members 54 are retained in position by means of plates 7 8 secured by screws 79 to one face of the disk 52.

The member 7 5 is provided with an annular groove 80 into which extends an arm 81 secured to a rod 82 slidably mounted in bearings in the cover 25.

The outer end of the rod 82 is rounded as indicated at 83 and bears against an inclined surface 84 formed upon an ear 85 extending laterally from the actuating lever 50.

The arm 81 has secured thereto, a spring 86 which tends to retain the rod 82 in the position indicated in Fig.4 of the draw- Vhen the actuating lever 50 is moved in the direction of the arrow a'on Fig. 10 of the drawings, the inclined surface 84coacting with the curved end 83 of the rod 82 will force said rod inwardly against the tension of the spring 86 and cause the slidable member 75 to be moved toward the disk 52, the cone-shaped end of said slidable member coacting with the surfaces 77 on the slidable members 54, forcing said members 54 outwardly, and causing the shoes 55 thereof to frictionally contact with the fixed ring 56 and retard the rotation of the worm shaft 38.

It is obvious that this retarding of the worm shaft 38 will prevent the load lowerin too rapidly.

It is self-evident that the operator may by manipulating the actuating lever 50, press the shoes 55 into any degree of frictional contact with the fixed ring 56.

This actuating lever 50 when in its normal position as shown in Fig. 10 of the drawings, retains the cam member 49 in position to permit the brake levers 43 to coact with the brake wheel 42 and lock the operating parts of the jack to prevent the lowering of the load.

As soon, however, as the actuating lever is moved from its normal position in the direction of the arrow a on Fig. 10 of the drawings, the brake levers 43 will be removed from the brake wheel 42 and simultaneously the inclined surface 84 coacting with the rod 83 will place the slidable member 7 5 in commission.

In other words, as .soon as the manually controlled brake is placed out of commission, l,

rotating-said shaft at a high speed only durthe retarding device will immediately be placed in commission and the speed of lowering of the load may be nicely regulated by slightly varying the angle of the actuating lever 50.

When pressure is released from the actuating lever 50, the springs 46 will force the brake members 43 into contact with the periphery of the disk 42 and prevent further lowering of the lVhen it is desired to raise the movable member 12, the operating mechanism. 19 is manipulated to turn the spindle 18 and gear 17 formed thereon in the direction of the arrow 6 on Fig. 3 of the drawings.

When this is done the ratchet 27 will freely pass the pawls 30 without actuating the spur gear 29.

While lifting the load the operating mechanism will. act directly upon the movable member 12 through the gears 17 and 16 and screw 15 without affecting the speed retarding and braking devices.

When the weight has been lifted sufiiciently, it will be retained in its elevated position by means of the friction members 43 coacting with the brake disk 42 and preventing the rotation of the worm 38.

When it is desired to lower the load supported by the movable member 12, the friction members 43 are removed from contact with the disk or wheel 42 by pressing upon the arm or lever 50 and with the pawls 30 in engagement with the teeth of the ratchet 27, the gear 29, pinion 36, worm wheel 37 and worm 38 will be driven by the rotation of the gear 17 and its spindle 18.

The pitch of the worm thread is such as to permit the jack to start automatically to descend under its-own load when its brake is released.

Should an excessive load be upon the cap 13 so that member 12 moves downwardly too rapidly, its movement willbe arrested by the action of the retarding device.

If it is desired to entirely stop the lowering of the load, pressure is removed from the actuating lever 50 and the brake members 43 will be forced into contact with the disk 42.

The multiplication of the braking power through the high ratio gearing and through the worm and worm wheel will serve to make possible the quick and easy stoppage of the descending jack at any point by means of a light pressure ofthe brake.

It is believed that the operation and many advantages of the inventlon will be readily understood without further description. I

Having thus I, described my invention, I claiml 1. In a device of the class described, the combination with a movable load-supporting member having a revoluble. shaft; means for ing the lowering of said load-supporting member; afixed cylinder; a disk therein rotatable with said shaft; a slidable friction shoe on said disk; and a manuallycontrolled movable member for forcing said shoe into contact with said fixed cylinder.

, 2. In a device of the class described, the combination with a movable load-supporting member having a revoluble shaft; means for rotating said shaft at a high speed only during the lowering of said load-supporting member; a fixed cylinder; a disk therein rotatable with said shaft; a slidable friction shoe on said disk; and a movable coneshaped member for forcing said shoe into contact with said fixed cylinder.

3. In a device of the class described, the combination with a movable load-supporting member having a revoluble shaft; means for rotating said shaft at a high speed only during the lowering of said load-supporting member; a fixed cylinder; a disk therein rotatable with'said shaft; a slidable friction shoe on said disk; and a manually controlled movable member having an inclined wall adapted to force said shoe into contact with said fixed cylinder.

4. In a device of the class described, the combination with a movable load-supporting member having a revoluble shaft; means for rotating said shaft at a high speed only during the lowering of said load-supporting member; a fixed cylinder; a disk therein rotatable with said shaft; a slidable friction shoe on said disk; means for normally retaining said shoe free from contact with said cylinder: and a manually controlled movable member for forcing said shoe into frictional contact with the cylinder wall.

5. In a device of the class described, the p combination with a movable load-supporting member having a revoluble shaft; means for rotating said shaft at a high speed only during the lowering of said load-support-- disk; and means operable by the movement of said cam member for forcing said shoes into frictional contact with the wall of said cylinder.

6. In a device of the class described, the combination with a movable load-supporting member having a revoluble shaft; means for rotating said shaft at a high speed only during the lowering of said load-supporting member; a fixed cylinder; a disk within said cylinder rotatable with said shaft; a brake wheel also rotatable with said shaft; brake arms coacting with said wheel; acam member for separating said arms from contact with said wheel; shoes slidable on said disk; a movable member adapted to force said shoes into frictional contact' with the wall of said cylinder a reciprocating member for actuating said movablemember; a spring for moving said reciprocating member in one direction; and a cam-actuating lever provided with means for moving said reciproeating member in the opposite direction.

7. In a device of the class described, the combination with a movable load-supporting member havin a revoluble shaft; means for rotating said s aft at a high speed only during the lowering of said load-supporting member; a fixed cylinder; a disk within said cylinder rotatable with said shaft; a brake wheel also rotatable with said shaft; brake arms coacting with said wheel; a cam member for separating said arms from contact with said wheel; shoes slidable on said disk; a movable member adapted to force said shoes into frictional contact with the wall of said cylinder; a reciprocating member for actuating said movable member; a spring for moving said reciprocating memher in one direction; and a cam-actuating lever provided with a inclined surface bearing against an end of said reciprocating member and adapted to move it in the opposite direction.

.8. In a device of the class described, the combination with a movable load-supporting member having a revoluble shaft; means for rotating said shaft" at a high speed only during the lowering of said load-supporting member; a fixed cylinder; a disk therein rotatable with said shaft; a friction shoe slidably mounted on said disk; a cone-shaped member revoluble with said shaft and slidable lengthwise thereof; and means for moving said cone-shaped member toward said disk and forcing said shoe into frictional contact with the wall of said cylinder.

9. In a deviceof the class described, the combination Witha movable load-supporting member having a revoluble shaft; means for rotating said shaft at a high speed only during the lowering of said load-supporting member; a fixed cylinder; a disk therein rotatable with said shaft; a friction shoe slidably mounted onsaid disk; a cone-shaped member revoluble with said shaft and slidable lengthwise thereof, said cone-shaped.

member having ahub provided with an annular groove; and means engaging said annular groove for moving said cone-shaped member toward said disk and forcing said shoe into frictional contact with the wall of I said cylinder.

10. In a device of the class described, the combination with a movable load-supporting member having a revoluble shaft; means for rotating said shaft at a high speed only during the lowering of said load-supporting

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