US1481445A - Lifting jack - Google Patents

Description

A. swANsoN LIFTING JACK s sheets-'sheet x Filed Jan. 29, 1925 @H101 mui i Immun i ra/@1250@ A. ASVVANSN LwTmG JAcK y Filed Jan. 2.9, 1925 `\3 shwrs-sham; 2"

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" A. SWANSON LIFTING JACK Filed Jan. 29, 1925 3 Sheets-Sheet 5 WWI Patented dan. Z2, i924.

narran stares reinar omen LIFTING JACK;v

Application led January 2a, 1923. SeralNo, Gil-5,675.

My invention relates to new and7 useful 'improvements in lifting jacks, and more especiallyY to a lifting jack which is relatively small in size, and used principally for lifting automobiles, trucks or other devices of similar size or weight.

One of the principal objects of the in vention is to provide a lifting jack, rela: tively small in size, compact in form; quickly and' easily operated7 andv capable of sustaining a relatively heavy load.

Still another object of the invention is to provide a lifting ljaclr which may be quickly and easily operated to liftlthe object desired, and after being so operated7 a frictional member may be brought into-ac-y tion to thereby further retain the object in its lifted position and; thus relieve the main pawl or catch ofthe load.

Still another object of the invention. is to provide a lifting jack which may be readily operated to lift the load, after which the frictional element is brought into contact with the elevating post or stem ofthe jack to retain the load. When itis desired to lower the load. the main catch will be first released, then the frictionalelement slightly released and the load Awill then descend slowly or rapidly as desired, Vdepending upon the amount of release movement applied to the frictional element.

Still: another object of the invention is to providea lifting jack, which isrel'ati'vely simple in construction; compact in nature; capable of sustaininga relatively heavy load; quickly andeasily operated to a raised position. and more easily lowered. toits nornial position.

lVi-tli these and other objects in view7 the invention consistsv in certain new and novel structures, and combination of parts as will be hereinafter described and pointed out in the claims. lseferringnow to the drawings showing` a preferred embodiment of the invention,

Fig. 1 is a side elevation of my improved ir/rl .iov-:ing a portion of thek casing removed for the sake of clearness, the lifting Y post being shown in a partly elevated posi,n tion. Y y f y Y Fig. 2^ is a front elevation showing the' post in a Vpartly elevated position.

Fig, is a vertical sectional View takeny on line 3 3v of Fig. l looking in the direcf tion off' the arrows.A .f

Fig. 4t is also a; vertical central sectional view taken on line 4 4 of Fig. 2.

Fig. 5y is also a vert-ical sectional view similar to Figi 3', vbut looking inY the opposite direction of the arrows; the. lifting pawls. being shown in their engaged-position.

Fig. 6 is a transverse sectional view taken on line 6-6 of Fig. 1 looking4 in the direc i tion of the arrows,- and" y u f Fig. V7 is a similar view taken on line 7`-,7 ofFigl.` Referring now inorefin'detailito the drawings there is shown a lifting jackcornprisf ing a hase 1, onwhich there is for-med yan integral hollow standard2', preferably rectangular in cross-section, and open atA its top 3, Two side plates t in the form of casings are shownwhich are tapered at their upper ends as at 5, these casings'beingfsecured to the standardI4 andhase as atlt by screws or other similar means. l On the front face of the ist-andarci".v are the projecting wings 7, as may be clearly seen'i'n Fig.. 2, these wings fitting within cut out portions Sformedl in the side pla-tese". These wings 7 also extend inwardly as at 8" and' shown in Fig. 1' and form a guide for a part ofthe lifting mechanism. which will be hereinafter more fully explained. Further cut out portions 10 are shownv in the front faces of theside plates 4. through which pass'the portions ofv cams 1-1' which are in turn mountedon the ends ofthe main shaft 12, this shaft turning in the bearings. 1d'L secured on the face ofthe stan'dard 2'; the shaft be'- ingop'eratedi by' a lever 125i which litswithin al socket' 16 formed on4 the' Shaft 12. n

As maybeseen iniligat' an aperture17`is formed. iny the standard near the upper endl thereof which` aperture isv surrounded by the boss 18w to which,in turn'is` fastened the small housing 19 in which is the spring 20,

while passing through the housing and through the aperture isthe main retaininoV pawl 21 which is threaded at itsy rear en as at 22 and' on. which "there is `loosely threaded the; wheel 23, The' spring 2O will normally force the pawl 21 inwardly' as ilar, a description of one willsuffiee.

shownin Fig, 4, but it may be withdrawn by a` turning oit the wheel 23 in a clockwise direction.

A further aperture 24 is formed in the krear of the standard as may be clearly seen in Fig. 4 about which is the boss 25, to which is secured the internally threaded housing 26 to receive the post oi the externally threaded trictional member 27. The post has the groove 28 formed on its inner end, and a frictional bloclr 29 is locked by the set screw 30 thereto. This li'rictional block 29 slidingly lits within the aperture 24 and is provided with the small cut out portion 31 on its rear, for the reception ot the inner end of the post as before mentioned. 0n the outer end of the trictional member is the small wheel 32 so that the 'frictional block 29 on it may he withdrawn from within the hollow casing or may be advanced ytherein for contact with a plane taco of the lifting post 33, now to be described.

This lifting post is also rectangular in cross-section, slidingly dts within the hollow standardr2, and has the head which may be integral therewith, or may be tastened to the same. On the two faces ot this post 33 are Vformed angular detents 35 while on the front face of the post are 'formed similar detents 36, the detents in both in` stances, not quite extending across the entire iaces of the post, butin alignment.

The detents 36 formed on the front 'fate of thepost receive the aforementioned main retaining pawl 2l as the post is elevated in its step by step movement. n

Now, for elevatingY this post in its step by Vstep movement, there areL Vshown two guide members 37 with the lifting pawls secured thereto, one being mounted on each side of the standard 2 and as they are simi Each guide member 37 is provided with what l' term a short leg 33 and a long leg 39, the short leg 38 being rammed by the cam il on the movement ot the handle 15. To the top of the guide member is secured the .pawl 4()V as may be clearly seenin Figs. 3 and 5, the nose or' the pawl 4l extending inwardly in a plane beyond that of its stem.

Referring again for the movement to the standard 2, there will be noted at the opposite sides thereof and near Vits top the openings 42, having the lower tapered walls 43, the taper ot these being substantially that of the vincline oi1 the inner sliding faces ot the pawl 40.k The pawl 40 is also hingedly attached to the upper end of the guide meniber 37 and as it is spring-pressed, its tend-y ency is to normally extend inwardly so that when the guide member 37 is lirst raised, the inner face of the pawl will slide upwardly and inwardly on the tapered surface 43 of vthe opening 42, the nose thereot engaging the det-ents formed in *he sides oi" the post and then continue in a vertical. or upright pat-hot movement.

As betere mentioned, there are two guide members 37 and two pawls 40 attached thereto, so that the post is lifted simultaneously from its opposite sides when the lever l5 operated. For each guide clement also, there is an upper bearing 44 which encircles the pper portion et the long leg 3), which leg is rectangular in cross-section at this point. The lower end of the lo leg 3,9 is rounded and passes through a bearing 46 against which abuts the spring 47, its lower end abutting against a collar 48 on the ieg, which collar may be iield in pla e ny the pin 49. The purpose ot this springis to return the guide clement and its pawl to its normal position after the gui-:le element has been raised and the handle then ele-- vated bythe operator. As will be remembered, there is formed on the face oi? the standard the wings 7 and they, in turn, have the inwardly extending :flanges S which form bearings for the guide membre 3T during their upward and downward movcment.

As tar as the specification has proceeded. it will be seen that on the operation of the handle l5 in a downward direction, the rams ll on the opposite sides of the standard will contact with the short legs 38 of the guide members 37 and as these guide members are raised, the pawls being spring-pressed. will slide upwardly along thetapered wall 43 and inwardly through the openings 42, and engage the detente 36 on the side oi the post and raise the same. As the post raised each step, the main retaining pawl 2l will be forced outwardly as the'pawi rides ng the surface ot the dctents and will then springinwardly and retain the post while the handle being moved upwardly while the guide members lare retracted by the sprinns 47 and the pawlg 40 slide downwardly and outwardly over the tapered walls 43.

Now, to remove the weight lrom the main retain: pawl 2l and to Vfurther sustain the load which falls on the lifting post, atter the post has been raised to its desired position. the rrictifnial member' 27 will be screwed inf. 'ely so that the trictional block 29 'will the plane surface 5l. on the et the post. rl`his rearsurtace fil also slightly tapered i'rom a portion near its top to its lower end as may be clearly seen in Fig. 4, the purpose oul this being that ir" the trictional i ember is loosened slightly, the weight ot the load on the post will not 'torce the same down too llv as a binding aition vill take place ,en the iriotion:4 block and the tapered surlace formed on the rear oi" the post.

To permit this post to drop either` slowly or rapidly, it will, ot course first be neces- Cil sary to tarn the wheel 23 to thus retract the main retaining pawl 2l.

From the foregoing, it will be seen that the operation of the iack is exceedingly simple., `the movement of the handle in a downward direction causing` the pawls at the sides to move upwardly and inwardly and raise the post in step by step mov-ement, the main retaining pawl holding the post while the handle is then raised. lifter the raisins' post las elevated the load to its desired ositionn the frictional i member may be operated to tightly hold the post in this desired position.

lWhen it is desired to lower the load and the post, the main retaining pawl 2l may ber retracted by a movement of the wheel in a clockwise direction after whichu the wheel 32 of the frietional member 27 may be turned slightly and. the post may be lowered slowly or rapidly depending on the amount of release'applied to the frictional member..

It will also be seenvthat the jack is one that may be elevated' or lowered rapidly and by providingthe frietional member afs shown, any or all of the strain will be taken from the' main retaining pawl and transferred to the frictional member and the side of the post. ln this wam a ack is provided which. will stand Qreaterloads than the jacks of the same Vrelative size. w irh are not formed'with the independent frictional lool;- inn means..

The jack is also one which is neat in appearance ofpreat strength and relatively cheap to manufacture. 1

Many slightchanpges might be made without in any way departing; from the spirit and scope of the invention.

Y Havingthus described the same, whatI claim as new and desire to secure by Letters Patent is 1. A lifting jack comprising a base, a standard on said hase7 a lifting# nest in said standard. means rooperable with two fares of said liftingn post for elevating the saine, a main pawl for en .fraginn` another face to i retain the lifting post as it is operated step by step, and an independent auxiliary member for engaging the fourth face of the lifting post.

2A lifting jaclrjcomprisinn a base, a standard on said hase. a liftno postrec tannular in cross-section. means cooperable with two ofthe faces for elevating the lift inn' post step by step. a sprinsrpressed pawl for engaging a third face of the post to. retain thelpost the same is being elevated, and africtional member to be inde-- pendently operated to engage the fourth face of said post to retain the post in a desired position. y

It lifting jack comprising a basea standard on said base, andk a post rectangular in eross-section movable within said standard, lifting paWls located on the sides of said standard cooperating with the sides of said ,lifting posts for elevatinly said post,y means cooperable with said lifting pawls to operate the same, a springpressed main pawl for retaining the elevating' post and a threaded movable frictional element for engagingY the rear face of said post to retain the lifting post at any desired point in its elevation.

il. A lifting: jack comprising a base, a standard. a lifting post movable in said standard. elevating; means cooperating with said standard. to raise the same step by step. means for retaining the lifting' post in its step by step movement. frictional means forYennagingsaid post independent of the lifting and retaining means, said first mentioned retaining means capable of being ref leased so that when said frictional retaining means is released, vthe lifting post may descend rapidly.

5.1i lifting); iaclr comprising a base. a standard on said base. a'liftinQ-post movable in said standard and'provided with detents on ythree of its faces and its fourth face being tapered3 lifting; pawls located on thev sides of said standard and cooperatinf with the detents on the two side faces of the lifting4 post. means for operating;-` said lifting .pawls to .elevate said lifting' post step by step. a retaining pawl for en raninl the detents on the front face of said post. an independent rfrictional element for engrapjingwhen operated. he vtapered fourth face of' said postg,` so Vthat rthe lifting post may be held in a desired position and so that alter the main retaining pawl has been released. .the frictional element maf,7 be slightly released and its engagement with the tapered portion` the post permit the liftingr post to descend slowly.

G. lifting jaeltcomprisinnj a base. a standard on sa l base.. a lifting; postinovable said standard; detents formed on three the faces of said lifting post and the fourth face beinf tapered substantially throughout its length. elevating means cured to sai d standard and cooperatinar with two faces of the liftii-.igf post to raise the saine step hv step. a retaining pawl engag-y ing the detents in the third face of said lifting; post. means for positively withdrawin the nawl from engagement with said de 1tent. independent operable frictional meansl mounted in said standard for engaging' said tapered face of said postto retain the post in desire-fl` position. and means for slowly releasing` said fri-ct-ional vmeans so vthai when said retaining; pawl is withdrawn., said frictiona-l means may be operated to lower the lifting` post slowlf,7 or rapidly desired. 7. A liftingm jack comprising a base.r a standard mounted thereon, a lifting post Eli (ill

and means for el-ea movable in said standard and having detents formed on Ythree faces thereof, ineani,t mounted on thestandard and projecting therethrough when operated for cooper tion with the detents on two ofthe faces to elevate said lifting` post, a spring-pressed pawl also passing through said standard and cooperating with detents on the third face tor retaining the post in its step by step movement, means for releasing said spring-pressed pawl from cooperation with saiid detente, independent frictional means for engagi the fourth race of said post also extending through said si'am'lard, ino` the sf ne so thaj the D yfter lifting posy may be faropped quickly a the main retaining pawl has been opera ed.

8. lifl'ii jack Comprising` a hase... a hollow standard mounted on said base, a lifting post in said standard, saifY standard being provided withopenings in its side portions and said openings provided with tapered lower walls` lifting pawls mounted on the outer side of said standard to Qooperate witl said posts,y i'neans for operating said pawls, automatic means for forcing said pawls inwardly through the openings in said post as they pass along the tapere walls and a retaining pawl for holding said post in its step by step upward movement.

9. A lifting jack comprising a base, a hollow standard mounted on said base, a lifting post provided with detente in said standard, said standard being provided with openings in its sides, said openings provided with tapered lower .valls,` lifting pawls slidingly mounted on the outside of said standard to cooperate with said detents, means for elevating said pawl and spring means forcing said pawls inwardly through the openings in said post as they pass upwardly along the ktapered walls, a retaining pawl for holding said post in its stepby step upward movement andv independent frictional means for engaging said post to retain the Ypost in any desired position. s

10. A lifting jack comprising a base, a hollow Vstandard mounted on said base, a lifting post in said stanfiiard provided with detents therein, said standard being provided with openings in its sides, said openings provided with tapered lower walls, guide members slidingly mounted on the outer sides of said standard,spring-pressed pawls secured to said. guiding members, means for elevating said guiding members, said spring-pressed pawls passing through the openings in said standard as they slide along the lower tapered walls ofl saidy opening and engaging detents in said posts to elevate the same. and a retaining pawl engaging other detents in said posts for holdsaid post in its step by step movement.

ll. A lifting jack comprising a base, a

hollow standard mounted on said base, lifting post in said standard provided with detents on a plurality of its faces, said stand-- ard being provided with openings in its sides, said openings provided with tapered lower walls, guide members sildingly mounted on the outer sides of said standard, said guide members each provided with a short legv and a long` leg, spring-pressed pawls secured to the upper ends of said guide members for cooperation with said post, means operable with the short legs of said guide members for elevating the same, said springin'essed pawls passim;` through the openings in said standard as theyslide upwardly along the lower tapered walls thereof and engaging detente in said postto elevate the samepand a retaining` pawl engaging other detents in said post for holding said post during` its step by step movement.

l2. lifting jack comprising a base, a hollow standard on said base, a lifting` post in said standard provided with detents on a plurality of its faces, said standard provided with openings in its sides, said openings provided with tapered lower walls, guide members lidingly mounted on the outer sides of said standard andeach of said guide members provided with a short and long leg, spring-pressed pawls secured to the upper ends of sait guide members for cooperation with the detente in said post, means operably contacting with the short legs of the guide members for elevating the same, and means oonneeted with the guide members Vfor returning the same to their normal position, said spring pressed pawls passing through the openings in said standard, as they move upwardly along the lowered tapered walls thereof, and engaging the detenta in said post to thereby elevate the` samel when said guide members are operated and a retaining pawl retaining detents in said post for holding said post in its step by step movement.

13. A lifting jack eomprising'a base, a hollow standard mounted on said base, a lifting post in said standard provided with detentsl on a plurality of its faces, said standard ,being provided with openings in its sides, said openings provided with tapered lower walls, guide members slidingly mounted on the outer sides of said standard, said guide members eaeh provided with a short leg` yand a long leg, spring-pressed pawls secured to the upper ends of said guide members for cooperation with said post. means operable with the short leg of said ide members for elevating the same, said spring-pressed pawls passing through the openings in said standard as they slide upwardly along the lower tapered walls thereof and engaging detente in said post to elevate the same, a retaining pawl engaging other detents in said post for holding said post during its step by step movement, and independent frictional means for engaging :i face of said post so that the same may be locked at a desired height.

i4. A lifting jack comprising a base, a hollow standard mounted on saidbase.l a lifting post in said standard provided with detents therein, an opening formed in said standard having a tapered lower wall, a guide member mounted on the side of said Y standard having` a pawl mounted at the upper end thereof, the same being springpressed and adapted to slide inwardly within said opening as its rides over the tapered wall to engage the detents in said post, means for raising said sliding element and pawl upwardly within said opening to thereby elevate the post, a retaining pawl for engaging other detents in said post, means for retracting said last mentioned pawl, independent locking means in the form of a frictional element for engaging a face of said post, and means for withdrawing said frictional element from contacting with said post to thereby lower the same.

l5. A lifting jack comprising a base, a hollow standard mounted on said base, a lifting post in said standard provided with detents in three of its faces, the fourth face presenting a plane surface, two guide members slidingly mounted on the opposite sides of said standard, each of said guide members being provided with a short and long leg, a sain mounted on said standard for engaging the said short legs to thereby elevate said guide members, bearings formed on said standard for guiding the long legs of each guide member, a further bearing located opposite the short legs for retaining 'he same in their sliding position when said guide members are elevated; means clon-V nerrted to thelong legs of eac-h guide members for returning the guide. members to their normal position, eaeh of said guide members provided with an inwardly moving pawl, said standard provided in its sides and near its upper ends with openings, the lower walls of said openings being tapered so that as said pawls raise and lower, they will move inwardly and outwardly into and out of cooperation with said lifting post, a retaining pawl for holding the post in its step b-y step upward movement, A,and means for positively withdrawing the same, said standard also provided with a furtherY opening and an independently operated frietional element movable therein for engaging the plane surface of said lifting post to thereby lock the lifting post in a desired position.

y In testimony whereof l affix my signature.'

ALFRED SWANSON.

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