US1597347A - Lifting jack - Google Patents

Description

. 1,597,347 R. D. FILDESv LIFTING JACK Filed Jan: 5, 1922 3 Sheets-Sheet 2 Arran/vtr Aug. 24 1926..

R. D. FlLDr-:s

LIFTING JACK 5 Shea ts-Shat :5

Filed Jan. s, 1922 Patented Aug. 24, 1926.

UNITED STATES PATENT OFFICE.

BOLLIN D. FILDES, OF MEDINA, OHIO, ASSIGNOR TO THE MEDINA MANUFACTURING COMPANY, OF MEDINA, OHIO, A CORPORATION OF OHIO.

LIFTING JACK.

Application filed January 3, 1922. Serial No. 526,740.

My invention relates to extension lifting jacks in which the body or pedestal of the jack is made extensible so that the jack isv sible pedestal providing a substantial support for the lifting screw which may be made smaller and lighteron account of the reinforcement provided by the extensible pedestal than would be possible in a-tall jack if an extensible pedestal were not used.

Among the objects of my invention are the provision of an improved lifting jack having an extensible pedestal; the `provision of an improved lifting jack operated by a worm and worm wheel; the provision of a lifting jack having an extensible pedestal made of unfinished parts; the provision of an extensible lifting jack the height of the pedestal of which can be readily changed when not supporting a weight but which cannot be changed when supporting a weight; the provision of a lifting jack having an extensible pedestal which is self lowering when the jack is not supporting a weight but which is automatically locked in adjusted position and prevented from accidental lowering when supporting a weight; the provision of a lifting jack operable by rotary movement of a shaft; and the provision of an extensible folding brace adapted to be used for positioning the jack under the object to be lifted from a point away from the object and for operating the jack from such a point. These and other objects are accomplished by the use of my invention, de

scribed in the following specifications and shown in the accompanying drawings in which:'`

Fig. 1 is a side elevation partly in section of a lifting jack embodying my invention;

Fig. 2 is a top plan view of the jack shown in Fig. 1', i

Fig. 3 is a central vertical section on line III-III of Fig. 1; y

Fig. 4 is a horizontal section on line IV-IV of Fig. 1; y

Fig. 5 is a horizontal section on line V- V of Fig. 1;

Fig. 6 is a horizontal section on line VI--VI of Fig. 1;

Fig. 7 is a Vfragmentary view of an automobile showing the application of my lifting jack with the positioning and cranking brace connected to it for raising or lowering the rear axle of the automobile;

Fig. IS shows my improved extensible cranking brace folded to permit it to be conveniently carried in the tool box of an automobile Fig. 9 is a fragmentary view of a joint of my positioning and cranking brace showing the locking sleeve in unlocked position;

Fig. 10 is a fragmentary side view of `a joint of my positioning and cranking brace `showing the locking sleeve in locking position;

Fig. 11 is a fragmentary side view of the joint shown in Figs.` 9 and 10 with the joint unlocked and partly bent; Y

Fig. 12 is a section on line XII-XII of Fig. 10;

Fig. 13 is a fragmentary view of the oper-` ating socket end of my cranking brace; and Fig. 14 is a sectionjon line XIV-XIV of Fig. 13.

Referring to the drawings, 1 is the lower or base portion of the pedestal, which has a foot or flange, 1*", preferably cast or otherwise made integral with the upstanding portion, 1b, of the pedestal.

The upstanding portion, 1", of the pedestal is preferably made cylindrical, or in the form of a gradually tapered cone the latter being the form shown in the drawings. I prefer to make the pedestal base, 1, of cast metal. Ribs, 2, or other suitable means may be provided for strengthening the foot fiange, 1. The pedestal base is made hollow,` the aperture, 3, which is preferably formed by a core being somewhat contracted at the upper end `of the pedestal base to provide metal for the internal screw threads,

7, preferably of cast metal having formed upon it, preferably by casting,7 a screw thread, 8, which is adapted to fit the internal screw threads, 1, formed in the upper portion of the. aperture, 3,., of the. pedestal base, 1. At its top,.`9, fthe Lipper portion, 6, of the pedestal is enlarged and has a chamber or chambers adapted to. receive the operating worm and worm wheel or jack-screw nut which members will be more fully' de-r scribed. The upper portion, 6, of the pedestal also has av longitudinal aperture: extending.E through it to receive: thel jack-screw, l0; The) lower part, l1, ofthis' j'aclrfscrew reL cei'ving aperture in th'e:1neinber,6', is prei erably madef considerably larger ina` diameter thanI the diameter of screw, 10', while the upper part, 12,` of the aperture ismade only large enough in diameter to provide a free sliding fit for the jack-screw, 10: rllhex wall of the contracted portienv, 12", of the aperture' serves as a guide and' support for the jack-screw, 1'0".. Theenla-rged portion, 11, serves as. a greaseV chamber and also reduces the weight of the pedestal. A metal disc, 11a, may be secured` in thelower end f of the shank, 7 to close aperture, 11, for retaining grease or oil therein;

ln the tcp4 or head, 9, of' the upper por'- tion of the pedestal tliei longitudinal aper- 'tureV is enlarged'into a' chamber, 13,y for the reception of an anti-friction thrust bear'- ing,` such asV thev ballbearing shown at' 14:, vand the revoluible jack-screw nut,A 1.5.1. The nut', 175, is threaded upon the jack-screw, 10, and is supported on the pedestal prefiera'bly by the bearing, 111'. Opening: out of chamber, 13, Vis; recess, 16, adapted to re'- ceivethe operating Worin, 17, the thread of which meshes with' worin wheel'y teeth^,.18, upon the periphery of jack-screw nut, 15, for rotating the latter to cafuse the raising or lowering` ofjzacl-.sc1ew,.10. v

The top erl head, 9,v of the extensible portion', 6, of the pedestalY i's-v preferably pro'- vid'ed withV af projection, 19, which incloses the recess, 165, and which forms an. oiltight housing surrounding the worm, 17.

:The worms, 1.7, is preferably of cast metal .an'di'isf mounted upon. the operating shaft, 20, to whichV it isv secured by .any suitable' means such as the pin, 21. A top cover or closure, 22, for thel chamber, 13, is prefer# ably provided.v lt may be' secured? to the head-f, 9, by any'suitable means .such as the screws, 23.V The. cover 22,. has a hole in it through which the j acltscrew, 10, slides in its vertical movements. lihev cover, 22,.serves not only to retain lubricant in= theY chamber, 13", butV also reta-ins theY jack-screw, 10, and nut, l5, in the pedestal after the parts are' assembled.. The chambers, 1,1; and 13,. are preferably made large so asV to contain enough lubricant to las-tV a long time.

A suitable, load-engaging head, 24, may

ribs, 27,. preferably cast thereon.

be formed upon or secured to the jack screw, 10. Suitable means may be provided for preventing the screw,10, from turning with nut, 15, this means being preferably a projection, 25,v on jack-screw, 10.. This may be any suitable, key-like projection, but l prefer that it be the end of a pin carried in a transverse apertureV in screw, 10, n-ear its lower end, and projecting outwardly beyond the side of the screw into a suit able vertical guide-way, 25, formed in the innerv wall: of the hollow shank,- 7, between in: Vthe drawings, pin, 25, is shown. extending clear Vthrough the screw,.11O-, forming projections oir either side thereof and enga-ging oppositel-y disposed guide-ways. lt will be noted that the guide-ways er slots, 2.6, entend upward' through the contracted pci-'trom 12, of the aperture in theV shank, and open into the expanded' portion,`l3, of this apertureso-that the j aclescrew, 10, may be. readily inserted into the pedestal member, (i. The guide-way, 26, maybev said to entend to the topf of the pedestal 'as the wall of the head, 9', isV above the loadl supporting part of the pedestal and forms a ciia'iber for the jack-screw and operating worm'. The screw, 1'0, may be raised until the ends of pin, 25, strike thelower ball` race, 28:, of the ball bearing, 14, by-which theupward movement of they jaclr.screw, 1G, willl be arrested.. While I prefer to--emplby an; antii friction thrust-bearing for the nut, 15,' it is obvious that, in the absence of suchY a bea-ring, the bottom of the nut may serve as a stop to limit the-upward. movement of the-screw, 10'.

I prefer to provide a. ball retainer, 28, preferably a sheet metal stamping, compris ing a perforated disc for receiving and separating the balls and internal and external oppositely upset flanges to :prevent the disc from being displaced far venough to allow the balls to escape.

The adjustment ofthe height of the pedestal is accomplished by screwing vthe shank, 7, of the upper pedestal member, 6, into and out of the pedestal base, 1.V llfhen: adjusted it may, if desired, beheld in the adjusted position 'by means of theset screw, 29, shown in Fig. 3; I prefer to make the` pitch of the threads, 8, so coarse that the shank, will be self lowering, or nearly so, when the set screw, 29, is loosened and when theja-ck is free. Such a coarse pitched thread facilitates the rapid adjustment: of the height of theV pedestal. l/Vhen, however, the jack is supporting a weightthe head, 24, of screw, 10, is in firm engagement with the load while the foot Hange,`1, of the pedestahl, is in firmv engagement with the ground and the shank, 7, is there-by,locker and prevented from rotating' in the pedestal base, 1. In other words my ,extensible pedin which the sha-ft is mounted.

estal is automatically held or locked in adjusted position when the jack is4 supporting a weight and cannot be accidentally or suddenly lowered.

rlhe worm, 17 is preferably cast, or, made of a drop-forging, ,and has its axis inclinedV 20, is shown inclined upwardly from the jack and extended back behind the vehicle where it can be readily manipulated.

To hold the worm, 17 against end thrusts when the jack is being operated to lift a load, I prefer to provide an anti-friction step or thrust bearing such as the hardened steel ball shown at 20, between the end of the shaft, 20, and the bottom of hole, 35, The hub of the worm, 17, may be made slightly shorter than the recess, 16, to prevent frictional contact on the hub when lifting a load. When lowering a load` the end thrust of the worm, 17 is so small as to make it unnecessary to provide an anti-friction bearing at the other end of the worm.

In the manufacture of my invention `I prefer to make all of the parts, 1, 6, 15 and 17, of cast metal, preferably of gray or malleable cast iron, as I find `that these parts can be made sufliciently` accurate by casting to require verylittle machine finislrl ing. In fact, the only machine work that l have found necessary upon these parte" as shown in the accompanying drawings is the drilling and tapping of the hole in the pedestal, 1, to receive the set screw, 29, the facing of the seat, 33, for supporting the lower race, 28, of the ball bearing, 14, the facing of the surface, 34, for receiving the cover plate or closure, 22, the drilling of the hole, 35, for receiving the operating shaft, 20, and the facing of the lower end, 36, of nut, 15, where it is supported by the upper bal] race, 37, of the thrust bearing, 14. It is obvious that instead of the ball bearing, 14, any other anti-friction bearing such as -anti-friction washers or other form of thrust bearing may be employed. I have found, however, that a ball bearing such as shown in the drawings operates satisfactorily in this structure.

For operating the shaft, 20, I prefer to provide a drive pin, key or similar projection such as shown at 38, which is adapted to engage with a socket wrench or other operating sleeve which can be slipped over the end of shaft, 20.` It is obvious that the shaft, 20, may be provided with a square or other flat sided end which would answer the same purpose. The projection, 38, also serves to detachably secure the cranking brace to the jack so that the latter may be readily positioned.

As the lifting jack, especially when used for raising the axle of an automobile, has to be set in somewhat inaccessible places, I have provided a folding, positioning and cranking brace, 31, the construction of which will now be described. rIlhe end, 39, of the shank of the brace is provided with a socket, 40, which is adapted to fit over the end of shaft, 20. The wall of the socket is `providedwith a T slot, 41, like the slot of a bayonet-joint, the longitudinal portion of which slot permits the passage of the drive pin, 38, through it into the transverse slot, 42. .The socket, 40, having been slipped over the end of the shaft, 20, the socket may be rotated about the shaft until the pin, 38, engages the end of the transverse slot, 42, when further rotation of the socket will cause the shaft, 20, and worm, 17, to rotate with it. Vhen the shaft, 20, and socket, 40, are thus engaged the shaft is securely held to the brace shank and the jack may be pushed under the object to be lifted by means of the extension brace thus making it unnecessary for the user to get dewyn under the object to be lifted to set the jac r. i

j The folding, positioning and cranking brace which is shown in the drawing is preferably composed of several joints hinged together by means of metal stampings as shown at 43. 'Ihe ends of the rod or shank sections, 30, 31 and 44, are preferably some what enlarged and provided with transverse pin apertures for receiving the connecting and hinge pins such as those shown at 45 and 46 respectively. One end of each of the sta1npings,43, is rigidly connected to a shank section by means of a pin, 45, and by reason of the engagement of the sleeve like portion, 47, ofthe stamping, 43, wit-h the end of the shank section as shown in Fig. 9.

The other end of the stamping, 43, is hinged tothe abutting end of the ,adjacent shank section so that it can fold only in one direction, the end, 48, of the stamping, 43, preventing the rotation of the hinged shank section in the opposite direction. In other words, I provide knee joints between the shank sections. `To prevent the iexing of the knee joint of the shank when in opera-tion I prefer to provide projections 49, upon the ends of the side portion of the stamping, 43, which side portions are spaced far enough apart to permit the hinged shank section to pass between them. I further provide, upon each shank which is thus hinged toi a stamping, 43,. a loose. sleeve such. shown at; 50,. the diameter of which is too great to pass; between the projections', 49, so that when this sleeve is pushed into the position in: which it' is seen in Figs. 7 and lO, the knee joints: of thev shank cannot flex.

lhile I havev shown: an odset crankl in the operating' shank section, 31,. it is obvious that any other convenient meansa for rotatlng the cranking brace may be employed.,

F l2: is: a cross y.section through the brace sha-nl and sleeve, 5t), the section being taken online XIII-XII of Fig; l0 showing the manner in which. the sleeve, 5.0', en.- gages the projections, 49?, to prevent the Hering of the joint..Y

F 14 which is ai sectionA onV line- XIV- XIV of Fig. 133 shows. the mannerI in which I prefer to` forni the end of the socket meinberf, 40. Instead otI cutting the longitudinal slot,.4l,. clear through the` wall of the socket, 40, I prefer to expand they metal outward or otherwise form it so that the slot, All, will be covered and' its walls connected and reiniorced by a bridge piece, 5l, which greatly strengthens the socket member and enables it to withstand the stresses which arev put upon it when in use.

The operation of my invention is as iollows Assuming that ist is. desired to: lift the alle 52, oi? the automobile shown in Fig; 7, the pedestal members, l and 6,I are adjusted" so that with. the lifting screw, l0, preferably protruding a little arbo-Ve the top. el? the pedestal iead, 9'; the total height of the jacll; is slightly less than the l'ieiglit oi the space available in which toset the jack; "Eh-is height can readily be judged by the eye of the operator. The set screw, 291, is now preferably tightened to prevent change in the adjustment of the height of the jack while it is bei-ng positioned. 'Ihe socket olf' the cranking'bra-ce iis. next applied to the shaft, 2G, the cranking bra-ce is un iolded and its joints are locked byv slipping the sleeves', 50, into the positions inl which they are shown in 7' and the jfackl is shoved into position under the axle, 52', by means of' the extendedV positioning and operating brace. IVI-ien thus in position. the jack may be raised by rotating the crank member, 3l, until the axle, 52, isv lifted to the desired height. Iin this operation of the pin, 38. engaged by one end of slot, in the socket, 40, and causes the shaft, 20, toA rotate with the brace crank, 31.

.'llo lower the jack the brace crank, 3l, ils rotated in'- the opposite direction. Vhen the head, 2l, has been lowered suiiic-iently to be relieved of the weight which it has lifted and to clear the axle, 52, the jack may be pulled out from under the machine. The positioning and operating brace may now be removed: freni the shatt,.2g and ioldedeisnzto the position shown in Fig.. 8 by sliding the sleeves, 50,. ont of' contact' with projections, e9. It it is desired to make the jack as corn.- pact as possible tor placing it ai tool' box,

pedestal ot the jack may then be adljusted to its shortest height and the set screw, 29.?, tightened. The-screw, l0', may also be lowered to its. lowestv position. by turning the shatt, 201

It will be seenv that my invention provides a jfack' which is strong and. rigidi tln'oughont its full range oil? use but which may be coinpacted into a Very small: space when not in use.. My invention is simple and. inexpensite to man aretere and possesses many' adL vanta-gemis. leatureswhich. are distinct impri-ovements over otherY forms of lifting jacks with whifeh I am familiar.. F or standard? autoinobizlc work I haveniade jacks. embodying my' intention capable of being usedthroughout a rz we of height from. 8%, tol 18'. It is obvious that various other` ranges. ofi t anreadily-be inadewithin thepra@ f s oil' construction. .all be apparent to those skilled?v in the art tliat' mod* inw-'ention without departing from the scope thereof. Y

li claim:

l. In al lifting ack, a: pedestal member, a jack-screw mounted to be moved' up: and down on said pedestal, said pedestal an enlarged hollow head2 at one end, a greasereceptacle at its opposite end ot' greater diameter than said jack-screw, and a bore'con necting; said grease-receptacle and the hollow' portion oft' said pedestal of a diameter to providea= tree sliding lit for the ja'clesorew, said? bore having a Verticali internal guideway extending its full length, and said grease-receptacle having vertical ribs the space betweenwhich forms a conti'nuzltion` of fic Vertical internal gu-ideway in the here, a projection on the lower end of said jaek.- 'crew adaptedE toA travel up and do-wn in` the guidewafy and' between the ribs to prevent the turning oi'A the jack-screw, and means mounted in the hollow head for operating the jack-screw.

2'. A lifting jack Vembodying a tubular base member and atubnlfar extension longitudinally adjustable with respect thereto, said tabular extension being formed with an enlarged hollow headY its upper end and having its lower portion interiorly enlarged and provided with "a closed bottom to'i'ornr agrease-i'ece-ptacle, operating mecl'ianism including a worin-gear 'located in said enlarged hollow head, and a jack-screw mount'` ed in said woinrgea-r and movable. up and down in said grease-receptacle.

A lifting jack embodying a tubular base member andv a tubular extension longitudina'lly adju-stable with respect thereto,

'icationsa may be made infiny saicl tubular extension being formed with an enlarged hollo7 head at its upper end and having its lower portion interiorly enlarged and provided with a closed bottom to form a grease-receptacle, operating mechanism 1nclucling a Worm-gear located in said enlarged hollow head, a jack-screw mounted in said Worm-gear and movable up and down in said grease-receptacle, and a looking means projecting exteriorly from said base 10 for looking the tubular extension in any adjusted positions relative thereto.

In `testimony whereof I affix my signature,

ROLLIN D. FILDES.

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