US986781A - Lifting-jack. - Google Patents

Description

J. B. TAYLOR.

LIPTING JACK.

APPLIOAIION FILED NOV. 23, 1909.

Patehted Mar. 14., 191i.

W/nesses.

To all whom it may concernf Y e Be it known that I, JOTHAM B. TAYLOR;

:of Auburn, in the county of Cayuga, in the State of New. York, have invented new and useful Improvements in Lifting-Jacks, of

.-which the following, taken in connection ator may stan with the accompanying drawings, isn .full,

T-his invention relates tocertain im'- provements in lifting'jacksofthe telescopmg. screw type adapted more particularly; for automobile uses fforjengilging on-or'ithe, y other ofth'e axles to lift the wheels from the" ground in removing or replacing the tires. In this specific use the jack and its operet "mem -mg,

openin' or. present y'described.

"A. vertica ly movable intermediate tube is provided with an external left 1- I UNI TED ST PATENT 1 I- Jo'rimnr B. TAYLOR; on nunumniinw i'onki i I Specificetionotlettersi'tent.. i f at tented Mar.) 1911. I gpplication filed November ee 909." nossz gmsi;

guideiwaf ei piirpose. i

hand thread 7 extending from. its lower I end upwardly througlioutj'the'. greater port v having "it smooth cylin ricaliperiphery and an nitern lghr t ing means. is necessarily placed low fdown' and operates in. a limited space and I -ha've. i; V found that the "vertical. movement- (lithe p operating-member is-more efiectivea'ndaid vantageous owin to the'fact that the opergreater power by direct downward. pressure upon the lever in operating'the screw. 1

My object therefore is to operate the-jack by means of 9. vertically movable lever through the medium of a 'ratchet and pawl notion wholly at one side and eccentric to the axis of the telescoping screws, so that the lever may have free vertical play at one side of such screws and its. supporting base through an arc of at least-90.

I Other objects and uses relating'to specific parts of the mechanism will brought out .m-the following description.

In the. drawingsF1gu-re 1 is aside'elevation of a lifting jack enibodyiiig the vari- 'ous 'features-ofmy invention. ig -2 is a 4 central vertical-sectionionline 2- '-2,- Fig. 1 Fig. 3 is-a top plan ofthe sanieja ck; the handle of the lever being broken away. ig-.,

4 is a. frontelehation of the upper portion of-e.- modified form of jock inwhich the teeth of the ratchet wheel mesh directly with 'thegear on the tubular screw;

In carrying out the objects staltedjan'u'pright tubular base .l is provided with a reduced upper end threaded internally, at

-2 endof somewhat smaller'j inner 'diemeter than the remaining lower portion oi the internal chamber as '3, said tubular base being provided with a laterally projecting upright-rib -4-- harving a vertical more erect and .obtainv ve mlingionennu .ing upon" the to while the ldwer" at fseen in i andcoll Engaged with the 501 hand gthreaded portion cyl ndrical itslength, the u per end ofs'gtid tube 3 which is threaded from its lower end ,upward a 5 throughout the greater portion of itslength of the 5 1; W1 ,3; An axlelrest orahen'd 1 is"v provided and extends some "distance; above'the upper with an*1internal qsocket rel?? receivin :the upper; endiofi the mi of the -head% being concave jto more efiec- .tively hold'it in engagement with the axle The yoke-' 11- is provided with laterally projecting journal bearing -+l9-'-" upon the' enlzi'rgedfportion of the bearin having a' contracted outer-end." Journaled 19 is a conibijned'ratchet .-whe'el"-'-20 an gear 21+,asshown' in FigsZI, 20ml 3,

the ratchet wlieel.- -2,0' "being in this in-J stance. of greeter' diameter-then the gear.

"headbeingtheldain placeibyga pin- +18 whichni's p'assed through 'theadjacent por- 'tions' of the heed and s'crew, the u'pper face 'as the rib -4. and has its lower end fitted with an easy sliding -fit in the guide way .or opening, so as to hold the'yoke 11'- against turning relatively to the base land at the same timeallowing it to move vertically as the 'screws are raised and lowered.

The portion.of thelever -22 which is journaled uponthe stud 24- is flat and held in place by a Washer 27- and cotterkey or pin 28 the intermediate portion of thedever in proximityto the peripheryof the ratchet 20- is enlarged at 29- and 1s provlded with a lengthwise-socket 30 and atransverse slot-'-31, the latter having a forwardly extending offset,

-3 2,, A sliding pawl -33= is movable in the socket 30-- against the action of I Y the spring 34-:- shown by 'ddtted lines in Fig. 1, said pawl being provided with :3. laterally projecting pin --35 which plays in the slot The object of this pin and slot is to permit so as to enable thelatter to o erate the the pawl to be removed or turned a half-turn ratchet wheel by the movement 0 thelever with the gear 1 2-'therebyomitting the. extra gear 21 shown in Figs. 1, 2 and 3, 40.

in either direction.

In Fig. 4 I have shown a ratchet wheel '20- as having its teeth meshing directly otherwise the two devices are identical, the operation being the'samein both instances. For example, assuming. that'it is desired to raise the head---l6 to lift a portion of a vehicle, the pawl 33-- is turned to the position shown in the drawings with the pin 35 projecting laterally through the otf-- set slotted portion -32- to the right of the lever, so as to bring the beveled engaging end of the pawl to' the top thereby permitting the pawl to rideover the edge of the teeth as the lever is raised without efi'ecting the operation of the ratchet wheel. When the lever.is depressed, however, the lower fiat face of the pawl engages and operates the ratchet wheel 20 and its correspond- 'ing gear -2lin the direction indicated by arrow a:, in Fig. 1, and impartsrotary motion to thegear -'12 and tubular screw -6 in the direction indicated by arrow 3 Fig. 3, thereby screwing both screws upwardly. It is understood that the screw 15 will be held against turning.

i by reason'of its engagement wit the .axle

or other part to be lifted; In 10 ering the -31- and "its oil'set portion 32-.

'head andl part supported thereon, 'i t is simply necessary to draw the'pawl back against the action of the spring -3()- to register the pin 35+ witlrthe slot'-'.31-. and then turn said pawl by meansof the pin a half mm whereupon the spring -30- forces thepa'wl forwardly into engagement with the ratchet wheel and brings .thejpin into ,the opposite ofiset.32 to hold the pawl against turning, it beingfun derstood that when the pawl is thus' 'ad'-.

justed the ,beveled side of its engagingend of the ratchet wheel and operating said ratchet wheel upon the upward movement of the lever.

What I claim is:

is inverted thereby allowing a free downward movement of the lever independently '1. In a lifting jack, a tubular base threaded internally and providedwith a guide-way in oneside thereo ,a tubuht'r screw threaded externally and internally. but in opposite directions the" external thread engaging the internal thread of the base an additional screw engaging the "interna I thread of. the tubular screw andprovided'at it's up'perendf with a lifting hea'd orrest, agear on-the upper end of-the tubular-screw, :a "collar se-'j'- curedtothe tubular screw some distance be-' .low the gear, ayoke engaginguthe t1(11bula r no at an pro-'.

screw between-said gear an vided with a laterally projectingjournal bearing. having a contracted outerend, aguide rod on the yoke slidably engaging-,-

with the guidewa on the base to prevent turning of the y o e, 'axvertically'mov able' lever journaled on the contracted outer end of said bearing, a combined gear an d'ratchet wheel mounted upon the enlarged 'end of. the bearing, said gear of less diameter than said ratchet and engagin with the gear on the upper end of the tubular screw, "and a spring-pressed pawl carried by the lever and adapted to enga ethe rachet for intermit tent-1y shiftin t e same whereb'y'motion is imparted to t e tubular 'screw.

2. Ina liftin jack, an upright base hav-' ing its upper end threaded internally, a yoke some -distance abo.ve the base and provided with -a journal opening coaxial with the threaded portion of the base, sliding connections between the yoke and base'to prevent turning of the yoke, a tubular screw. I

portion enhaving an externall threaded gaging the internal y threaded ortion of 'the base and having its u per en provided with an internally thre'a' edpoi'tiqn .of'opposite pitch, said tubularlsc'rewjhaving its upper end provided with-a gear-resting upon the to face of the yoke, 'a-collar. secured to the t-u ular screw-and engagingthe lower face of the'yoke, said y'oke-.g i

rig provided.

with-a laterally projectingfiournal bearing having a contracted outer end, a-lever jourm Q -naledl oh th e centl'acted outer end of said o e direbti on whebahyhmotioh will be"im-. aring, a combined gear and rptchet n'wuntparted to the tubular screw. e'd upon said bearing, said gear of less diam- In jwitness whereof I have heneunto -set etex; than said ratchet and meshing-with the y hand on this 18th day of November 1909.

5 gem carried by the tubular screw, and a- 7 JOTHAM B. TAYLOR; sptmg-pressedpawl 'carried by the lever wltnesses: 51nd adapted toiengage the ratchet forrotat- H. E. Oman,

mg the same when the lever 'is, ectuated in A. L. Humnu.

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