US1708717A

US1708717A - Jack

Info

Publication number: US1708717A
Application number: US219509A
Authority: US
Inventors: Sydney P Barker
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-09-14
Filing date: 1927-09-14
Publication date: 1929-04-09
Anticipated expiration: 1946-04-09

Description

Patented Apr. 9, 1929. 'I'

UNITED STATES SYDNEY P. semana,l or NEW YORK, N. Y.

Application filed September This invent-ion relates to jacks and while fit is/particularly adapted for usein connection with automobiles, the invention is of course not limited to'any particular' use.

An object of the invention isto provide a jack in which the movement of the turning parts is compounded or multiplied so as to impart a; rapid movement to the lifting plunger and also give a maximum movement from relatively short members, so that, while all necessary lifting movement is provided,

the jack when collapsed or telescoped will occupy but a relatively7 small space.

A further object is to provide a jack of this characterwhich is strongand compact, which can be keptlubricated and which will give the maximum of movement and power to the minimum of power expended. j

`With these andother objects in view, the invention consists in cert/ain novel features of construction and combinations and arrangements of parts which will be more fully hereinafter described and pointed out in the claims.

In the accompanying drawings- Figure 1 is aview in vertical longitudinal section showing the parts of my improved jack in their lowermost or collapsed position;

vFigure 2 is a similar view showing the members of the jack partially extended; Figure 3 is an enlarged view in transverse section on the line 3 3 of Figure 1.

Figure 4 is a top plan view or" certain details.

1 represents a hollow base and 2 a tubular I upright integral with the base and of general cylindrical form. The hollow base 1 is closed by a removable base plate 3 secured thereto vby .screws or other attachingT means 4 and havingwebs thereon which supporta ball 6. 7 represents a horizontally positioned gear wheel having a socket member 8 central in the bottom thereof which has a thrust bearing on the ball G.

A drive shaft 9 projects through a. bearing 10 in the base 1 and has a pinion 11 thereon meshing with the gear wheel 7, and the outer end ot this shaft 5 may be made angular, as shown at 12. to receive a wrench or crankv or other suitable 'device for imparting a rotary motion thereto. 13 is a removable collar located on the shaft 9Vand adapted to removably secure-the shaft 9 in the base 1.

A vertical post 14 is iixed to the center of gear 7 and turns therewith. This post 14 is located. centrally in the tubular upright 2,

JACK.

14, 1927. Serial No. 219,509.

is externally.screw-threaded and is hollow. A collar 15 is secured in the upper end of the post 14 and has an angular opening 16 therein so as to receive an angular stem 17 on a screw head 1S. The screw head 1S is of appreciably greater diameter than the post 14 and is externally screw-threaded and meshes with the internal screwv threads 19 in a hollow cylindrical plunger 20.

This plunger 2O may carry any suitable saddle or head 21 at its upper end and is pret'- erably of a length to lit approximately within the upright 2 when lowered or collapsed. A sleeve 22 is disposed between the post 14 and .the plunger 2O and this sleeve has internal screw threads 23 at its lower end which engage the external screw threads of the post 14.

The parts are so arranged that the upper end 24 of the sleeve 22 engages under the screw head 18. This sleeve 22 is provided with one or more external longitudinal keys 24 which move in keyways 25 in an internally threaded portion of the plunger 2O so as to prevent independent rotary movement ot' these parts. l

A shell 26 Vis interposed between the plunger 20 and the upright 2, and this shell is provided with al keyway 27 receiving a key 28 on the plunger V 20. The keyway 27 extends throughout the major portion of the shell but said keyway terminates short of the upper` Vend of the shell so that a shoulder 29 is provided on the shell and is engaged by the key 28 when the latter reaches the posit-ion shown in Figure 2, so that a continued upward movement of the plunger will draw the shell with it and Vthis shell will cover the joint between the plunger 20 and the sleeve 22 and strengthen theV telescoping parts and cover their joint when the jack is extended.

I also provide in the shell 26 an external longitudinal groove 30 which extends 'from its upper end to a point adjacent its lower end,'an`d I locate a screw or other-removable device 31 in the upright 2 which rides in this groove and which engages a shoulder 32 at the lower end of the groove to prevent further kupward movement ofthe shell, or, in other words, to limit the upward movement thereof.

In describing my improved device I have referred to the parts as being tubular, cylindrical7 etc., and it is obvious that the invention is not to be limited to the shape of the parts as this may be varied. I have also referred to certain parts as having keys and others as having keyways andv grooves,

Ya'ndfthis is of.A course to be understood as de# scribing the illustrations only as these parts may be reversed as desired.

The operation is as follows.:

Assuming the parts to be in the positionv shown in Figure l, a turning movement el.

shaft 9 in one direction will, through the medium of pinion Vl1 and gear wheel 7, iin-part rotary motion to the post 14. As vthis post has screw-t-l'irea'ded'- engagement with the sleeve 22 it'will cause sai'd.l sleeve to moveupfwardly.

Furthermore', by reason' ol the' coupled engagement ofthe angular stem 17 to post 114,

this stem will likewise be turned, and the lscrew 18 thereon meshing, with the internal had. lfVhen the plungerreaclies the position 'shown in Figure 21,. Vthe key 2S will cause the shell to move upwardly, covering the juncturebetween the plunger and the sleeveV and vreinforcing the device as a whole init-s tele- .'fscoping'action. To collapse the jack the shalt 9" isturned in the opposite direction and the parts will vbe tui-ned downwardly and mainly enclosed. within the4 upright 2', as clearly indicated in Figure: l'. i

lVhile I have illustrated what I believetto be aprelerred. embodimentot my invention,

i it is .obvious` thatlvaifious alterations and `changes might be made in the general form ot the parts described without `departing from the inventionand hence `l dolnot limit myself to the precise details set forth but consider myself-atliberty t'o. make such changes and alterations as fairly fall within the spirit and scope ol the appended claims.

l,Icla'ima I i l. A jaclnincluding a hollow upright, a

A rotary externallyscrew-threadedhollow post in the; upright, means for turning the post, a vertically movable plunger, anV V angular stem telese'oping inv the' post, a sciew head on the stem engaging'tlie internal threads oit the plunger,y and a sleeve on the postfengaging the screw headand having internal screw-r threaded engagement wit-h the post.

2'. jack, including a hollow upright, a rotar externally screw-threaded fhollow post in the uprigli't, means for `turning the post, a verticallyV movable plunger, an'V angul lar stem telescoping in the post, .ascr'ew head C I tween the plunder and the u' right and caused, to move with on the stem' engagingthe internal threads of Y Y the. plunger, asleeve' on-the postengaging the ed engagement with the post, and a shell bescrew head and having internal screwethreadi the' plunger-alter th'elatter has moved a defined dist-ance. f. 'i

i 3'. YA jack, including ai. holle-w'upri-ghn-a notary externally screw-threaded hclloi1 post in 'the upright, means for turning the post,

aY--vertically movable plunger, an angular stem telescoping inthe post, a screw head on the stem engaging the internal threads ot the plunger,'and a sleeve on the post `engaging the screw head and having internal screwthlreade'd engagement with the post, said upright and post held against longitudinal movem e`nt*'andr all other of said parts keyed together whereby Van Yindependent rotary movement is prevented. Y f v 4. A jack, includ'ing'a hollow post, a rotaryy externally screw-threadedhollow post in the upright, means for turning the post, a vertically movablev plunger, a plurality ot' means operated by the turning movement of the post' to impartjlongitudinal movement to the plunger and compound said movement, and a shell betweeny the plunger and the upright and caused' to movey with the plunger alter the latterlias moved a defined distance, said upright and post held'against longitudinal movement andV allother ol said parts l'reyed together whereby"independent rotary movement is'prevented. f i i 5; A jack, includ-ing a hollow upright, a rotary externally screw'fthreaded hollow post in the upright, means for turning the post, a vertically movable'- plunger, an angular stem telescoping in the post, a screw head on the stem engaging the internal threads of the plunger, alsleeve on the post engaging the screw headv and having internal screwA threaded engagement with the post, and a shell between the plunger and' the upright and caused to move with the plunger after the latter has moved a deli-ned distance, said uprightand post held against longitudinal movement and all other ol said parts keyed together whereby independent rotary movementis prevented.'

6. A jack, including a hollow base, an upright on the base,y removable plate secured to the bottom of the base', al gear wheel 'having a thrust bearing on saidvba'se plate', a pinion engaging the gear wheel, ashal't secured to the pinion and .projecting through the base, an externallyscrew-threaded hollow post fixed to turnv with the gear wheel, an internally screwthreaded plunger, a sleeve having internalA screw-threaded engagement with the post, stemmounted to turn with the post and telescope therein, a screw head on thestem engaging the'internal threads of thel plunger and engaged by: the upper end ofthe sleeve, and said sleeveV and Vplunger keyed together.v 7

7. A'Jacl, including'a hollow'base, uprighton the base, a removable plate secured to the bottom of' the base, gear wheel having a thrust-bearing on said hase'plate, a pinion cngagingthe gear wheel, a'shait secured to the pinion andiprojeeting through the base, an externally screw-threadedhollow -post xed to turn with `the gear wheel, an

internally screw-threaded plunger, a sleeve having internal screw-threaded engagement with the post, a stern mounted to turn with the post and telescope therein, a screw head on the stern engaging the internal threads ofthe plunger and engaged by the upper end of the sleeve, and said sleeve and plunger keyed together, and a shell keyed to the outside of the plunger.

Signed at New York, in the county of New York and State of New York this 12th day o'f September, A. D. 1927.

SYDNEY P.' BARKER.