US1376869A

US1376869A - High-speed lifting-jack

Info

Publication number: US1376869A
Application number: US409420A
Authority: US
Inventors: Frank L Gormley
Original assignee: A O NORTON Inc
Current assignee: A O NORTON Inc
Priority date: 1920-09-10
Filing date: 1920-09-10
Publication date: 1921-05-03
Anticipated expiration: 1938-05-03

Description

F. L. GORMLEY. HIGH SPEED unmc JACK. APPLICATION FILED SEPT-J0. 1920; 1,376 869. Patented May 3, 1921.

3 SHEETSSHEET 1.

fi wentor: Frank L. Gormlcy,

F. L. GORMLEY.

HIGH SPEED LIFTING JACK.

APPLICATION nun SEPT. l 0. 1920.

Patented May 3, 1921.

3 SHEETS-SHEET 2.

Lwnlor: .FranhLfiormlqy,

Patented May 3, 1921.

s SHEETS-SHEET a.

NM a w w 1 m w FRANK L.

GORMLEY, or BROOKLINE, MASSACHUSETTS, assrenoa TO A. o'uoaTOn,

INC OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

HIGH-SPEED LIFTING-JACK.

jacks known as self-run-down jacks adapted to be lowered under the weight of the load and in which the speed of lowering may be retarded by a suitable brake mechanism under the control of the operator.

The object of the present invention is the production of a self-rundown lifting jack in which the operating and braking mechanism are all positioned in the base of the jack.

The invention consists primarily in a rew oluble lifting screw provided with a gear cured to the lower end thereof and a main operating mechanism for lifting the load coacting with said gear and a holding and braking mechanism also coacting with said gear and adapted to be actuated only during the lowering operation.

The invention further consists in certain novel features of construction and arrange ment of parts which will be understood readily by reference to the description of the drawings and to the claimsto be hereinafter ven. For the purpose-0f illustrating the inven tion, one preferred form thereof is illus trated in the drawings, this form having been found to givesatisfactory and reliable results although it is to be understood that the various instrumentalities of which the V invention consists canb'e 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:

Figure 1 represents a vertical section of i a liftingjack embodying the principles of the present invention.

Fig. 2represents an elevation of the inner- Specification of Letters Patent. 7 Patented Ma 3 1921 Application filed September 10, 1920. Serial No. 409,420.

side of the plate carrying the retarding mechanisms, the driving shaft being shown insection.

F 1g. 3'represents a horizontal section of the same on

l1ne

3, 3, on Fig.2.

Fig-V 4 lQ S ents an elevation of the re tarding and. braking mechanisms, portions thereof being shown in section, and

Fig. 5 represents an elevation of a por- ,tion of the jack showing the lever for actuatng the brake mechanism.

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

In the drawings, 10 is a base having extending upwardlytherefrom a centrally disposed cylindrical projection 11 to which is threaded the lower end of a casing 12.

This casing 12is provided withrectangular lateral flanges 13 and let preferablyopposite each other as indicated in Fig. 1. 7

These flanged openings give access to the interior of the casing 12 and are normally closed by plates 15 and 16 respectively.

The upper end of casing 12 has a vertical cyllndrical portion 17 the interior wall 13 at the upper end of which forms a bearing surface for a movable member or-rarn 19.

The upper end of the ram 19 has a serrated surface 20 adapted: to contact with the load to be lifted and the lower end/of said ram 1s provided with a nut 21 secured from turning therein by the members 22.

The nut 21 co'acts with a revoluble screw 23 the pitch of the thread of'which is such as to permit said screw to be turned when phednut 21 is forced downwardly underthe The lower end 23 of the screw 23 has a bearing in a plate 2 1 resting in. a recessin the projection 11, said plate 2 1 having in its upper face an annular track 25 for a plu- .rality of balls or other anti-friction members 26.; V

These balls extend into an annular track 27 formed in the under side of a plate 28 surrounding the hub of a bevel gear 29 keyed to the lower end 23 of'the screw 23.

When the screw 23 is rotated by the gear 29, the revolution thereof will cause the nut 21 and ram 19 to move upwardlyto lift the V load and when under the weight of the load the ram 19 and nut 21 is moved downwardly. This downward movement of the nut will cause the rotation of the screw 23.

The ram 19 is free to rotate when it is not supporting a load and its upper end is provided with a plurality of radial depressions ing mechanism is removed therewith.

This lifting mechanism consists of a bevel pinion 31 meshing with the bevel gear 29,

said pinion 31 having keyed thereto a spur gear 32 and being provided with cylindrical axial-

hubs

33 and 34;

The hub 33 is mounted in a bearing 35 in the plate 15 and the hub 34 is mounted in a bearin in a bracket 35 secured to the inner face of the plate 15 in any well-lmown manner.

The gear 32 meshes with a pinion 36 on the main operating shaft 37 said shaft being adapted to rotate in a bearing 38 in the plate 15 and a bearing 39 in a bracket 40 secured to the inner face of the plate 15 in any usual manner. a

On the outer end of the shaft 37 is mounted a usual form of operating device 41 but as this operating device forms no part of the present invention, it is believed to be unnecessary to describe the same in detail.

By actuating the operating device 41 rotary movement will be imparted to the

gears

36, 32, and 31 which rotary movement will be transmitted to the gear 29 and screw 23 and the lifting of the load will be effected.

When the load is to be lowered under its own weight, the actuating device is placed in neutral position thus permitting the

gears

29, 31, 32 and 36 to freely rotate.

The jack is provided with a retarding mechanism which is entirely supported on the removable side plate '16 and which may be removed therewith.

The retarding mechanism is connectedto the gear 29 of the screw 23 by means of a bevel pinion 42 having a hub 43 revolubly 'mounted in a gland 44 fixedly secured in" the plate 16.

Keyed to the hub 43 is a ratchet wheel 45, the teeth of which, during the lowering operation, are adapted to be engaged by pawls 46 carried by aspur gear 47 freely rotatable about the axis of the gland 43.

The teeth of gear 47 mesh with those .of

. ing lever 7 0.

other direction by the a pinion 48 revolubly mounted in

bearings

49, 49 and having threaded or otherwise secured thereto a spur gear 50 which meshes with a worm 51.

The thread of the worm 51 is of such a pitch that the worm will be rotated by the rotation of the gear 50.

V The worm 51 is formed upon a shaft 52 revoluble in bearings 53 in a bracket 54 secured to the inner face of the plate 16.

Extending from one end of the shaft 52 is a reduced shank 55 to which is threaded or otherwise secured the gear 56, the teeth of which mesh with those of a pinion 57 secured to one end of a shaft 58 parallel with the worm shaft 52 and freely revoluble in a bearing in the bracket54. i

The opposite end of the shaft 58 has secured thereto a gear 59, the teeth of which mesh with those of a pinion 60 freely revoluble about a sleeve 61 threaded or otherwise secured to the reduced end 62 of the shaft 52. V

The hub of the pinion 60 has secured thereto a brake wheel 63 which rotates at a speed considerably greater than the speed of rotation of the worm 51.

'As a consequence of the high speed of the brake wheel 63 as compared with the speed of rotation of the main screw 23, it is obvious that slight frictional contactwith the brake wheel 63 will effectually retard the rotation of the screw 23 and thereby contol the lowering of the load.

Moreover, the extended train of reduction gearing betweenthe screw 23 and the brake wheel 63 is suflicient to retard materially by its inertia, the. speed of descent of the movable member of the jack.

The bracket 54 has pivoted thereto at 64,-

the brake arms 65 which partially surround the periphery of the brake wheel 63 and are normally held in contact therewith by the springs 66. interposed between fixed members and the free ends67 of the brake arms 65. Between the free ends 67 of the brake arms 65 is interposed a cam-member 68 having fiat sides as shown in Fig. 4.

This member 68 is revoluble about the stud 69 and on its outer end has an aetuat- The movement of the lever 70 is limited 7 in one direction by the pin 71 and in the guard flange 72 formed upon the plate 16.

When the brake arms 65 are in contact with the wheel 63, as shown in Fig. 4, the

load will be retained'in raised position but when these arms are moved from contact .with said wheel, the jack will rundown under the load.

The speed of this loweringmay be controlled by the operator manipulating the ance of the usual lifting jacks is avoided and a jack produced having a greater degree of stability.

By providing the main screw with a lifting mechanism on one side thereof and a speed controlling mechanism diametrically opposite the lifting mechanism, a perfectly balanced jack is obtained.

It is believed that the operation and many advantages of the invention will be under-v stood readily without further description.

Having thus described my invention, I claim 1. In a lifting jack, the base; a standard superimposed thereon; a movable member therein; a nut in the lower end thereof; a lifting screw in said nut; a gear secured to the lower end of said lifting screw; two pinions meshing with said gear; a lifting mechanism adapted to rotate one of said pinions; a brake mechanism and means controlling the operation of said brake mechanism adapted to be actuated by the other pinion. V

2. In a lifting jack a base; a standard superimposed thereon; a movable member therein; a nut in the lower end thereof; a lifting screw in said nut; a gear secured to the lower end of said lifting screw; two pinions meshing with said gear; a lifting mechanism; means operable by said lifting mechanism adapted to rotate one of said pinions; a brake mechanism; and a one-way driving connection between said brake mechanism and the other pinion whereby said brake mechanism will be placed in commission only during the lowering operation.

3. In a lifting jack, a base; a standard superimposed thereon; a movable member therein; a nut in the lower end thereof; a lifting screw in said nut; a plate in the base having a smooth cylindrical bearing for the lower end of said screw; a gear secured to the lower end of said lifting screw; two pinions meshing with said gear; a lifting mechanism; means operable by said liftlng mechanism adapted to rotate one of said pinions; abrake mechanism and means controlling the operation of said brake. mechanism adapted to be actuated by the other pinion.

4. In a lifting jack, a base; a standard threaded to and extending upwardly therefrom; a vertically movable member in said standard; a nut in the lower end thereof; a 'llfting screw in said nut; a braking mechanism coacting with the lower end of said screw, and a lifting mechanism independent of said braking mechanism also coacting with the lower endof said screw.

5. In a lifting jack, a base; a standard secured thereto and extending upwardly therefrom; a vertically movable member in said standard freely revoluble in said standard when not surmountedby a load; a nut in the lower end thereof; a lifting screw in said nut; a braking mechanism. coacting with the lower end ofsaid screw and a lifting mechanism independent of said braking mechanism also coacting with the lower end of said screw.

6. In a lifting'jack, a base; a standard extending upwardly therefrom and having diametrically opposed lateralzopenings therein; a movable member in said stand ard; a nut in the lower end thereof; a lift ing screw in said nut; a gear secured to the lower end of said lifting screw; a removable plate for each lateral opening; a lifting mechanism mounted on one plate including a pinion adapted to mesh with said gear; and a braking mechanism on the other plate including a pinion adapted to mesh with said ear.

7. n a lifting jack; a base; a standard extending upwardly therefrom having a lateral opening; a member movable vertically in said standard; a nut in the lower end thereof; a liftin screw in said nut; a bevel gear secured to the lower end of said screw; a removable plate for said lateral opening; a bevel pinion rotatably mounted in said plate and adaptedto mesh with said gear; a spur gear revoluble with said bevel pinion; and an operating mechanism also mounted on saidplate and including a revoluble pinion meshing with said spur gear.

8. In a-lifting jack, a base; a standard extending upwardly therefrom having a lateral opening; a member movable vertically in said standard; a nut in the lower end thereof; a lifting screw in said nut; a bevel vgear secured to the lower end of said screw;

a removable plate for said lateral opening; a bevel pinion rotatably mounted in said plate and adapted to mesh with said gear;

a braking mechanism mounted on said plate; means actuated by said bevel pinion for operating the braking mechanism only during the lowering operation; and means independent of said braking mechanism actuating devices for rotating said screw gear.

9. In a lifting jack, a base; a standard extending upwardly therefrom having a lateral opening; a member movable vertically in said standard; a nut in the lower end thereof; a liftin screw in said nut; a bevel gear secured to t e lower end of said screw; a removable plate for said lateral opening; a bevel pinion rotatably mounted in said plate and adapted to mesh with said gear; a brake wheel mounted for rotation on said actuating devices for rotating said screw ear. b 10. In a lifting jack, a base; a standard extending upwardly therefrom having a lat eral opening; a member movable vertically in said standard; a nut in the lower end thereof; a lifting screw in said nut; a bevel gear secured to the lower end of said screw; a removable plate for said lateral opening; a bevel pinion rotatably mounted in said plate and adapted to mesh with said gear; a

brake" wheel mounted for. rotation on said plate; a drlving ear for actuating said brake wheel; a rate et wheel secured to and revoluble with said bevel pinion; a plurality 20 01E pawls carried by sald spur gear and co- Boston, Mass, this 1st day of September, 1920. FRANK L. GORMLEY. WVitnesses:

WALTER E. LoMBARD', NATHAN C. LOMBARD.