US1286361A

US1286361A - Lifting-jack.

Info

Publication number: US1286361A
Application number: US20986218A
Authority: US
Inventors: George O Leopold
Original assignee: NORTH BROS Manufacturing CO
Current assignee: NORTH BRO'S M'F'G CO; NORTH BROS Manufacturing CO
Priority date: 1918-01-02
Filing date: 1918-01-02
Publication date: 1918-12-03
Anticipated expiration: 1935-12-03

Description

G. 0. LEOPOL'D.

LII-TING JACK.

.APPLICATION FlLiD mmz, 191s.

Patented Dec; 3, 1918.

mamm 2 SHEETS-SHEET I- a/WMQ G. 0. LEOPOLD.

' LIFTING JACK, APPUCATION FILED JAN. 2. 191s.

1,286,861,. Patented. Dec: 3, 1918.

2 SHEETS-SHEET 2.

ATES 'nnrnnr orrio GEORGE o. LEOPOLID, on PHILADELPHIA, PENNSYLVANIA, AssIeNon TO NORTH isnos MFG 00., OF PHILADELPHIA, IEENNSYLVANIA, A CORPORATION, OF PENNSYL-f VANIA.

LIrrING-JncK.

Application filed January 2, 1918. Seria1No.209 ,862.

ments in lifting jacks, particularly of the 1 type used in connection with automobiles.

One object of my invention istomake a substantial ask which will retain the load 1n any position in which it is elevated, andto make the jack so that it can be a considerable height.

A further object of the invention is to provide means for allowing the jack to be projected to quickly lowered, and also to allow the jack to be raised to a height without operating the gearing. i

The invention also relates to details which will be fully described hereinafter.

In the accompanying drawings: Figure 1 is a sectional elevation illustrating myimproved lifting jack, the two plungers being partly raised;

Fig. 2 is a sectional plan view on the line 22, Fig. 1, with the shaft and worm wheel in full lines; y w a Fig. 3 is a sectional elevation on the line 33, Fig. l; it

Fig. 1 is a sectional plan view on the line 41- 1, Fig. 1;

Fig. 5 is a sectional plan view on the line 5--5, Fig. l;

Fig. 6 is a sectional plan view on the line 6-6, Fig. 1;

Fig. 7 is a sectional 7-7 Fig. 2; i

Fig. 8 is an elevation of a portion of the base partly in section, illustrating the inner plunger locked to the outer plunger; 1

Fig. 9 is a perspectiveview of the locking pawl by which the inner plunger is locked to the outer plunger; 1 t

Fig. 10 is a perspective view of the paw carried by the outer plunger and arranged to engage the teeth of the inner plunger;

Fig. 11 is a perspective view of the plate which is located between the inner and outer plungers and which prevents the rotation of the inner plunger in the outer plunger;

Fig. 12 isa perspective view of the pawl for locking the standardisihollow and v H ardis the outer plunger 3 having a racket l at one s1de which engages the pinion ,5

plan view on the line shaft; and 1 Fig. 13 is a detached view of the handle for operating the jack. i l

11s a Standard having abase 2. i located in the standlooselymounted on ashaft 6 carrying at one-end the worm wheel 7. This shaft,

Patented n e. aft amp.

pinionto the worm wheel, i

worm wheel pinion-are mounted 111a,

housing 8 forming. part of the standard l injl the present instance. The worm wheel? is secured to the shaft 6 by a key 9 and pin 9 Mounted withinthe outer plunger 3 is an inner plunger 10 having teeth 11 atloneside with which the pawl 12 engages. This 11mm}. I. is carried by the outer plunger 3.: It will be noticed that thetoothed side of thejinner 1 plunger 10 is flattened, and carried the outerplunger is a plate 13, Figs. 5 and 11,

which fits between the inner and outer plungers, as shown in dottedlines. in Fig. .1, 1.

I One'fifaceofthis plate. is flat and "the other face is curved, sothat when it is inserted in position, as in Fig.jt1, it will prevent the lnner plunger turmng in the outer lun er, 1 j 180. movement of theinner plunger. Thisplate but will not interfere with the vertical 13 has an extension 14: turned uptas at 15,

and this turned up portion 15 is located in slot 16 in thepawl 12 and acts as a guide for the pawl and also as abearing for a pressure spring 17 which is located in a cavity in the pawl and which tends tot'orce the pawl into yielding contact with the teeth? i 11 of the inner plunger 10;

The teeth 11 are made as clearly shown in Fig. 1, having an abrupt lower edge and a beveled upper edge,so that/the inner plunger can be lifted by-hand or by any suitable tool, such, for instance, as the forked end 1810f the handle 19, Fig. 13, the handle beingxof. sufiicient length so that anuoperaton can reach in under an automobile and lift the 11 inne'rjplunger to the height desired.

Carried by the upper end ofthe inner plunger is aswiveled headyQOhaVing a V- 1001 groove 21, as shown, in the present instance, 1 and having m ma projection 22 at one side which can be enteredlbetween"the axle and Ethe strainer me res automobile when l it is impossible to place the jack centrally under the axle.

At the lower end of the inner plunger 10 'is a pivoted pawl 23 pressed out by a stiff spring 24. The pawl is hung in a bearing by ears 25, Fig. 9, and the lip 26, at its lower edge, is arranged to engage the shoulder 27 at the lower edge of the outer plunger when the jack is entirely depressed, as shown in Fig. 8.

A light leaf spring 28, in the present instance, is secured to the outer plunger and bears upon the edge of the lip 26, and,

when in the normal lowered position, as shown in Flg. 8, Wlll have no effect upon the pawl 23, as the spring 24 is stronger than the spring 28, but when the outer plunger is raised to the position shown in Fig. 1, the spring 28 is forced against the inner wall of the standard 1 and presses against the pawl 23 with sufficient force to overcome the pressure of the spring 24 and consequently the inner plunger is released with ratchet teeth 32 which are engaged by a pawl 33, shown bydotted lines in Fig. 2, carried by the arm 34 mounted on the portion 31 of the shaft 30 and held 'in place by a washer 35 and a screw 36. The shaft 30 is reduced at 37 and projects beyond the housing 8, as shown in Fig. 1, and'a split ring is located between the housing and a washer 39 on the shaft, the washer being held in place by a screw 40. The split ring frictionally holds the ratchet wheel while the pawl is on its return movement.

In order to lock the pinion 5 to the shaft 6, I provide a pawl 41, shown clearly in Fig. 12, which has a tooth 42 beveled at one side. This tooth is arranged to enter one of the grooves 43 in the hub of the pinion 5. The pawl is located in a slot 44 in the shaft 6 and its inner end isnotched to engage a cross bar 45 carried by the shaft 6. .A spring 51 bears upon the under side of the pawl 41 and tends to force the pawl into enring 49 located in a groove in the shaft 6. The sleeve 47 is retained on the shaft by a spring ring 50 located in a groove in the outer end of the shaft, as clearly shown in Fig. 3.

It will be seen by the above construction that the outer plunger can be raised and lowered by a ratchet movement and it is held in any position to which it is adjusted by the worm and worm gear. The ratchet device can be reversed, as in other types of ratchet mechanism, so as to raise the jack or lower it, and by the use of the spring pawl, which locks the shaft 6 to the pinion 5, the ack can be quickly lowered by merely pressin upon the collar 47 so as to force the pawl out of engagement with the pinion 5, when the outer plunger will be lowered by its own weight carrying with it the inner plunger, and when the pawl 12 comes in contact with the inclined face 52 of the standard 1 it is forced outward, releasing the inner plunger 10 from engagement by the pawl 12, and this plunger will drop by its own weight.

Cushions may be provided for the two plungers and in the present instance I have shown a cushion 53 located in the bottom of the base 2 and held in position by a detachable plate 54 so as to cushion the plungers when they are dropped from an elevated position on pressing the collar 47.

If the jack is used as an automobile jack, the operation is as follows :The jack is placed on the ground and, if possible, directly under one of the axles of the automobile so that the strain will be directly on the plungers, but if there is a strainer rod then it may be necessary to engage the axle by the curved projection 22, the base being so designed as to properly support the load.

The outer plunger is raised by the ratchet. mechanism to the point indicated in F 1, where the spring 28 forces the pawl 23 carried by the inner plunger out of engagement with the outer plunger by coming in contact with the inner wall of the standard 1, then the inner plunger can be raised by merely pulling up on the head so as to bring the head directly under the aXle, and the forked end 18 of the handle 19 may be used for this purpose, particularly where it is diflicult to gain access to the jack. After the head has been properly located in position, the handle 19 is placed in the socket 53 in the arm 34- and the arm reciprocated, causing the shaft 30 to be turned and this shaft imparts movement to the shaft 6 through the worm and worm wheel and as the pinion 5 is locked to the shaft 6 by the pawl 41 it will be turned and the outer plunger 3 raised, lifting the aXle of the automobile to the desired height so that the wheel will be clear of the ground. The jack will hold the axle in the elevated position as it is locked by the worm and Worm gear, but, on reversing thepawl 33, the movement of the shaft 30 can be reversed and the outer plunger can below ered, lowering the aXle and when theplun ger is lowered sothat the pawl 12 comes in contact w'ithxthe inclined surface 52ofthe standardl, theinner plungerxwill be "released and both plungers willthen be in their lowest positions. i a i If 1t is desired,however, to release the outer plunger without using 3 the 3 ratchet mechanism, the collar 47 can be nushed so as to release the pawl 41, when both plungers will drop into their lowest positions.

I claim y 1. The combinationinaliftingjack;ofa standard; a toothed outer plungerinountedk within the standard; a pinion} meshing with the teeth of the outer plunger; a Worm and worm gear for turnlng the pinion so that the plunger can be adjusted and held in its adjusted position; an innerplunger mountment with the inner plungerwhen the outer plunger is lowered to its fullest extent.

2. The combination of a standard, ,an in ner and an outer plunger mounted in the standard, teeth on each plunger; the teeth on the inner plunger being'in the form of ratchet teeth, a spring pawl carried by the outer plunger and engaging the teeth of the inner plunger, a transverse shaft having its bearings in a housing carried by the standard; said pinion engaging the teeth of the outer plunger, a' shaft ,on which the pinion is loosely mounted, a pawl located in the shaft and arranged to engage the pinion so as to lock the pinionto the shaft, H means for turnmg the shaft, and means for withdrawing the pawl from engagement with the pinion so as to allow the outer plunger to drop to its normal position.

3. The combination of a standard; an inner and an outer plunger mountedin the standard; teeth on each plunger, the teeth on the inner plunger being in the form of.

ratchet teeth; a spring pawl ecarriedby the outer plunger and engaging the teeth of the inner plunger; a transverse shaft having its hearings in a housing carried by the standard, said pinion engaging the teeth of the outerplunger; a shaft on which the pinion is loosely mounted; a pawl located in the shaft and arranged to engage the pinion so as to lock the pinion to the shaft means for turning the shaft; means for withdrawing the pawl from engagement with the pinion so as toallow the outer plunger to drop to its normal position, said standard having a portion arranged to force the spring pawlcarried by theouterplunger.

from engagement with the teeth ofvthe inner plunger so that it wilhalso drop :to its normal positionu y 1 i 4.! The con'ibinationin alifting jack; of a standard; an outer, hollow plunger mounted within the standard teeth on said plunger;

an inner plunger mountedlwithimthe.hol-

low, outer plunger and having ratchet teeth apawlplate; mounted in a slot in the upper end of thef outer plunger and. engaging,

thetfiteeth offithe inner plunger, said inner plungerqbeing flat on thewtoothed side; a,

half round plate mountedbetween theiflat tened portionof the inner plunger and the of the projection. being turned up; a coiled spring mounted between the turned up portion and the pawl plate, and tending to fouterfplunger,and having aneXtension pro-1 h Jectmg through the outer plunger, the ends force the pawl plate into yielding engagement with the teeth of the plunger; a pinion engaging the teeth of the outer plunger; and

means for turning the pinion.

5. The combination of a standard; a plunger having. teeth at one sideya housing; a pinionmounted in the housing and meshing with the teeth of the plunger; a

shaft on which the pinion is loosely mounted; a worm wheel secured to the shaftand also-mounted in the housing; a

pinion; means for releasing the pawl so as to disengage the pinion from the shaft; a shaft at right angles to the first mentioned shaft and mounted in the housing; a worm on said last mentioned shaft meshing with the worm wheel; and means for turning the worm shaft.

6. The combinatlon in a liftlng Jack, of a standard; an inner and an outer plunger,

each having teeth, the teeth of theinner plunger being in the form of ratchet teeth;

a pawl on the outer plunger engaging the teeth of the inner plunger; a pinion mounted onthe standard and arrangedto engage the teeth of the outer plunger; a. pawl on the lower end of the inner plunger arranged to engage the outernplunger; a sprmg for yieldingly lioldingthe pawl inengagement with the outer plunger; and means for releasing the pawl when the outer plunger israised a given distance so that the inner engaging the teeth of the outer plungeiga pawl on the lower end of the inner plunger arranged to engage the outer plunger, a

spring tendingtofhold the pawl in yield- 95 p pawl carried bv the shaft and arranged to engage the ing engagement with the outer plunger, and a spring carried by the outer plunger hearing against the pawl and shaped so as to be engaged by the inner wall of the standard when the outer plunger is raised so as to press the pawl out of engagement with the outer plunger and to allow the inner plunger to be raised. a

8. The combination in a lifting ack, of a standard; an inner and an outer plunger mounted in the standard, each plunger having teeth, the teeth of the inner plunger being ratchet teeth; a pawl on the outer plunger arranged tov engage the teeth of the inner plunger, the standard having a beveled portion arranged to force the pawl out of engagement with the teeth of the inner plunger when the outer plunger is lowered; a head carried by the inner plunger; means for coupling the two plungers when they are in their lowest positions; means for releasing the inner plunger when the outer plunger is raised a given distance; a pinion meshing with the teeth of the outer plunger; and means for turning the pinion.

In witness whereof I afiix my signature.

GEORGE O. LEOPOLD.

' Copiesof this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, I). G.