US751336A

US751336A - Lifting-jack

Info

Publication number: US751336A
Authority: US
Publication date: 1904-02-02
Anticipated expiration: 1921-02-02

Description

No. 751,336. vPATENTED EEB. 2, 1904.

. M. v. E. PERKINS & G. Y. PATTERSON.

LIFTING JACK.

APPLIUATION FILED 111111.26. 1903.

No MODEL. 2 SHEETS-SHEET 1.

J8 z!//////////////////// |1|| L 11| No. 751,336. PATENTBD PEB.'2, 1904. M. v. H. PERKINS G. Y. PATTERSON.

LIFTING JACK;

rrLIoArIol Hum In. as. 1903.

2 VSHEETS-SHEET 2.

I0 MODEL.

UNITED vSTATES u -Iatented February 2, 1904.A i

PATENT f OEEICE.

MARTIN vJII, PERKINS, OE NEW YORK, AND GEORGE Ir.` PATTERSON, OE

BROOKLYN, YORK.

LlFTlNG-JACK.

A SPECIFIGAIIONy forming part of .Letters Patent N o. 751,336, dated February 2, 1904.

. 'York, both citizensof theUnit'ed States, have invented certain new and useful Improvef ments in Lifting-Jacks, of lwhich the following is a speciiicationl- Thisinvention comprises improvements in liftingjacks, the details of which Will be pointed out in the following p specification, taken in connection with the 'accompanying drawings, in whichf Figure 1 is a central vertical section through the lifting-jack. Fig. 2 is a section on the line 2 2 of Fig. 1'. Fig. 3v is a side view of the ratchet device for operating the jack. Fig. 4 is asimilar View of the pawl and the slide in which the pawl is mounted, and Figxv is a plan view of the ratchet-wheel.

Referring to the drawings, A indicates a standard of suitable form having a.l circular socket or recess 1 at its upper end and a central cylindrical opening 2, which extends downwardly through the center of the standard from said socket. Within the vertical opening 2 is arranged a lifting-screw B, which is Supported and operated by a worm-wheel 3, the .latter being arranged in the recess or socket 1 upon ball-bearings 4. Thethreads 5 of the liftingscrew engage corresponding threads in the worm-wheel, and when the lat' ter is rotated the lifting-screw, which is prevented from rotating by the load upon it, is

raised or lowered, according to the .direction of rotation Avof theworm-wheel. A head or end ofthe screw 'by means of threads 6 upon the screw, which are reversed in direction with respect to the threads 5, and the head of the screw is preferably riveted Aover at the top, as

indicated by the numeral 7. The worm-wheel has an'extended hubB, which permits the Wheel to ybe engaged by a y.sufficient number of threads to. readily withstand the maximum load. An annular channel 8 is formed in the base of the wheel, and within this channel is.

, Application filed March 26, 1903. SerialNo. 149,662. (No model.)

fitted an annular bearing 9, of hardened steel, havingv thereon lugs or projections 10, which fit into `sockets or depressions in the base of the channel andl prevent the bearing from slipping around in the channel. A similar bearing `il is located in a channel 8 in the bottom of the recess A1 in the standard. Race- Ways 11l are formed in the adjacentjfaces of the bearings, the Walls `12 and 13 of 'each race; Way being at right angles to one'anothcr and at an angle of about'forty-ve degrees to the plane of rotation of the wheel. The balls therefore. touch the corresponding walls of both raceways at points in vertical linesat oping 2 is arranged a receptacle D for lubricating material, this receptacle-consisting of a cup or cylinder d, which surrounds the screw and has a threaded connection with the walls of said opening, said cylinder'being closed at 'its lower end and open at its upper end. I An annular re ess orA Socket 2b is formed in the bottom of t e standard, surrounding the vertical opening and forming therewith a shoulder 14. The lower end of the receptacle is enlarged, forming a circular head 15, winch fits into the socket 2b,'and between said head and the shoulder- 14 is arranged a gasket 16,

which effectually prevents the escape of oil or other lubricant which may leak down around the receptacle.' The head 15 of the receptacle lies flush with the bottom; of the standard and serves as a part of the base of thestandard.

A pin extends diametricall'y through the lower end of thelifting- Screw, and its projecting ends formf Stops which engage the shoulder 14hA and vlimit the-upward 'movement n v of thescrew. l

.- The interior ofv the standard or casing is rendered' as nearly as possible' dust-proof'by means ofv a cover-plate 17, which extends over the wall oftheannular recess .1, and agasket 18, arranged beneath the plate.

secured to the inner end of the sleeve rand.

adapted to hold the balls in place'when the shaft is removed. The balls bear against the interior face of a sleeve 25, which is screwed into a threaded recess in the casing and abuts against a shoulder 26. The interior wall of the sleeve 25 converges toward its outer end. The parts of the bearing F are the same in construction as the partsmof the bearing E; but the outer sleeve 25 of the bearing F instead of abutting against a shoulder which would limit its movement'may be adjusted longitudinally of the shaft to compensate for wear, and it is provided with a lock-nut 27, which secures the sleeve in its adjusted position. When it is desired to remove the shaft, it is simply necessary to unscrew the nut 27 and the sleeve 25,

when the shaft may be taken out, the balls being held in place by the ball-retainers. The latter, it may be noted, do not come in contact with the balls when the shaft is in position. The ratchet-wheel, as shown in Fig. 5, has a'polygonal opening in the center, through which a correspondingly-shaped end portion of the shaft extends. The ratchet lever or handle 28 is provided with forked

arms

28 and 28", which are journaled on the shaft at opposite sides of the ratchet-wheel, and the lever and ratchet-wheel are held against endwise movement upon theshaft between a shoulder 29 and a' Cotter-pin 30 or other suitable retaining devices. A ratchet mechanism G, comprising a slide 33 and a pawl 37, pivoted thereto, is arranged within verticalland horizontal guide-

slots

31 and 32, which intersect one another in the ratchet-lever near its inner end. The slide 33 is arranged within the vertical slot 31. vThis slide has two parallel arms v3a, and a pin or shaft V35 extends through and is journaled in said arms. A knob or handle 36 is secured upon one end of said shaft. The pawl 37 is removably secured to said shaft between the arms of the slide and 4within the 'guide-slot 32. Thev pawl is wide enough to extend "across the slot 31, so that the pawl serves as a guide for the slide 33 and prevents lateral displacement of the slide. The pawl and slide may be removed by unfastening the pawl from the shaft`35 and removing the latter. The shaft 35 extends through the center of the pawl, and the ends of the pawl are provided with cam-faces 38, sloping in opposite directions, the opposite sides 39 of each end being straight. The cam is normally -having a-worm thereon engaging said worm- -reverse the position of the pawl by giving the knob 36 a semirevolution. v

Having described our lnventlon, what we claim, and desire to secure by Letters Patent,

1.. In a lifting-jack, a standard or casing,-a

worm-wheel horizontally arranged within the casing, a lifting-screw extending centrally through. the worm-wheel and having a threaded engagement therewith, a worm-shaft having thereon a worm engaging said wormwheel, aA ratchet-wheel secured to said shaft, and means for operating said ratchet-wheel comprising alever journaled upon the shaft, a slide carried by said lever,-a spring normally pressing said slide toward the ratchetwheel, and a centrally-pivoted pawl carried by said slide and having its opposite ends suitably formed to engage and move the ratchetwheel in opposite` directions.

2. In a lifting-jack, a standard or casing, a worm-wheel horizontally arranged within the casing, a lifting-screw extendingA centrally through the worm wheel andy having a threaded engagement therewith, a worm-shaft having a worm engaging said worm-wheel, a 4ratchet-wheel secured to said shaft, and means for operating said ratchet-wheel comprising a l lever' journaled upon the worm-shaft, said 1ever having intersecting "slots near its inner end, a slide in one ofsaid Slots, a pawl arranged -in the other slot and pivotally connected to said slide, and a spring normally pressingV said slide toward the ratchet-wheel. 3. In a lifting-jack, a standard or casing, a worm-wheel horizontally arranged within the casing, 'a lifting-screw extendingl centrally through the worm wheel and having a threaded engagement therewith, a worm-shaft wheel, a ratchet-wheel secured to said shaft, and means for operating said ratchet-wheel comprising a lever having forked arms journaled upon the shaft at opposite sides of the ratchet-Wheel, said lever having intersecting slots near its inner end, a slide in one of said slots, a pawl in the other slot and pivotally connected to said slide, and a spring normally pressing said slide toward the ratchet-wheel.

4:. In a lifting-jack, a standard or casing, a worm-wheel horizontally arranged within the casing, a lifting-screw extending centrally through the, worm wheel and' having a threaded engagement therewith, a worm-shaft having al worm engaging said worm-wheel, a

IOO

ratchet-wheel secured to said shaft, and means l for. operating said ratchet-wheel comprising a `lever j ournaled uponjthe Worm-shaft, said lever having intersecting slots near tsinner end, a slide arranged in one of said slots and having forked arms, a shaft or pin journale'd in said forked arms, a reversible pawl arto said pin, and a spring normal said slide toward the ratchet-wheel. 5.l -In a lifting-jackfa base or standard havranged in the other of said slots and secured ly pressing ing an opening extending therethrough, and a socket at each end of said opening, a worm- `wheel arranged in the upper socket, a liftingscrew extending through and supported by Said worm-wheel, and a lubricating cup or re I`-ceptacle extending upwardly into said openling.l from the base of the standard and sur-l rounding thev lower part of the screw, said receptacle. having a head at its lower end4 fitting vinto lthe lower socket in the standard.

6. In a lifting-jack, a base or standard having an opening extending therethrough and a socket at each end of 'saidopening, a worm-v VWheel arranged in the upper socket, a coverplate extending over said socket, a liftingscrew'extending through and supported by.

said worm-wheel, and a lubricating cup or receptacle extending upwardly into said opening from the-base of the-standard and surrounding the lower part of the screw, said receptacle having a head vat its lower end fitting into the lower socket in the standard.

7. In a lifting-jack, a standard or casing havinga vertical opening, la lifting-screw vertically arranged in said standard, a horizontallyarranged Wheel supporting said screw and having athreaded connection therewith, said wheel `being rotatable about the screw Vand having an annular ball-raceway o'n its lower side, said standard also having an opposing ball-raceway, and balls within said raceways, the walls of .each of said raceways being a1'- ranged to engage the balls at two points on opposite sides. of their vertical diameters. 8. In a lifting-jack, a standard or casing having a socket in its upper end, an annular groove or channel in the base of said socket and a vertical opening extending downwardly from said socket, a wheel arranged within said socket and having an annular groove in its lower face', a lifting-screw extending through the hub of `gsaid wheel, said wheel being rotatable on the screw, annular bearings arranged within the channels of the wheel and socket, said bearings having 'raceways, the walls of which-are4 arranged substantially at right angles 'to one another, and balls arranged-within said race- 49. In a lifting-jack, the combination with the baseor standard, the lifting-screw and the worm-Wheel threaded upon said screw, of a worm -shaft having va wormengaging said wheel', and ball-bearings for said worm-shaft comprising sleeves secured to .the shaftat opposite ends of the Worm and'having annular grooves therein, balls in said grooves, ball-retainers secured tothe sleevesand adapted to hold the balls in place, taperingsleeves'or shells fitting into 'suitable openings in the standard and extending aroundthe balls, one `of said tapering `sleeves being fixed/in position andA the other sleeve'being adjustable, and!