US1652455A - Lifting jack - Google Patents

Description

Dec. 13, 1927.

L. D. NILSON LIP TING JACK Filed Aug. 16. 1926 2 Sheets-Sheet l L. D. NILSON LIFTING JACK Dec. 13, 1927. 5 1,652,455

Filed Aue:.16. 1926 2 Sheets-Sheet 2 "imam/a fl fZgd/l w W Z77 flMdf/Zif Patented Dec. 13, 1927.

UNITE-11 B TE Nro F'FICE- LEONARD nINILsoN; or wAY zA'rn,

MZENNESQT-A, ASSIGNOR TO MARQUETTE MANU- FACTURING CCMPANY, 01 ST. PAUL, IINI-IESOTA., I

LIF'I'ING JACK.

'a pucat-i n ea August 16, 19 26. Seri'al 110, 129,511.

Theobject of myinvention igito provide a lifting jack especially adapted-forautomobile service work and more partiouiarlyfor service in connection with eievatine' a 0i-.

tion of an automobile for permitting. the tire ortires of the automobile tojbe changed or repaired as the case may be. 7 V

vStill a further object is to provide a lifting jack capable ;of use for lifting heavy automobilf'es sue-h trucks and busses.

I Still a further object is to provide. fixed sector or rack bar adapted to have a gear orpinion ooaet therewith whereby lifting arms of the. jack may be-raised or lowered for raisin or lowering an automobile or the like. v r 7 i 4 r v Still afur'ther objeet is t0 provide a pair of rack bars arranged tocoa-et with a pair of gears which are mounted on the lifting arm itself ofthe jack and which are caused to upon the lifting arm of the jack. 1 Still a further object is to provide lockrotat e by a ratchet:member also mounted ing and lifting pawls mounted upon the lifting arm of thejack and movable; therewith, the lifting and lockingpawis capableofbeing rendered inoperative for causing them to disengage the ratchet with which they fcoact for allowing-the load lifting- 'arm of the jack to. assume its normal or nonoperative posin. a. My present invention is related tothe subject matter of my copending application on the lifting jack filed-July 26, 1926, Serial 'No. 125,011, patented ll/[arch 1st, 1927, No. 1,619,304. a

lVith' these and other'objects in view, my,

invention consists in the COl'lStl'UClllOIl,' ll,- rangement and combination ofthe Various parts of my lifting jack, whereby the objects contemplated are attained, asi' hereinafter more fully setforth. pointed outin my claims, and illustrated inthe accompanying drawings in which 3 V I Figure 1, is a top plan view of myrimproved lifting jack.

Figure 2 is a sectional view taken'on line 2-2 of 'Figure l, the parts being broken.

away to better -il-lustrate the construction and arrangement o'ftli'e parts.

Figure 3, is 'a'dcta il sectional-view takenon line 33 of Figure 2 illustrating theas sembljy hf We spaced gears and atchet-and T holding pawl their relation tothe lifting arms of the jack. Figured, is a vertieal "sectional view't'a'ken enline 4'4 of Figure 2; v v Figure 5, is a sectional view taken on line 5+5 of- Figure 2, illustrating the load lifting memberfof the jack. 1

V Figure& is a. sectional viewillu'strating the positionof the lifting and holding pawls with the lifting pawl in engagement and the h'eld'out of engagement with the ratchet; v

Figure ,7, a similar view'with the lifting pawlstill in engagement, and the locking pawlreleased eo thatitfis in position to engage the next notch of the ratchet. Figure 8, is a similar view with the lock ing pawl in engagement with the next notch of the ratchet and the lifting pawl released, and 7 f F'gure 9, is a" similar view with the holding pawl in engagement-with the ratchet and the lifting pawl released so that it is 111 position to engage the next. not-ch of the ratchet. l i

In the accompanying drawings I have usedthereference numerals 10 and 12mindicate the front and rear. axles or supports of my jack. .The axles '10 and 12 each project throughipair of. spaced triangular frame members 14. p r V The frame members" 14 are spaced apart by'a sleeve 16 mounted upon thefront axle 1() and by sleeve 18 mountedupon the rear axle 12. The sleeve 18 is formed integral with a pair ofv spaced curved rack bars 20. The sleeve 18 forms the lower mounting or connection for the rack bars 20 and a similar sleeve 22 is formed integral with the rack 7 bars 20 at their upper ends. The sleeve 22 is received between the tWO flftl-lllG; plates 1 and has a bolt 24 projected therethrough ,Wherebytheframe plates are held in engagement with the sleeve 22; e e The-axles 10. and 12 and the bolt2 i serve to hold the frameplatesin proper position andthe sleeves l6, 18 a'n d 22 holdsuc-h frame plates in proper spaced apart position;

The -}parts just described may be conideredthe supporting frameformy lifting jack. r I I A pair of wheels 26 are nounted upon the ends of the front axle 1 0 which pr I read, the frame plates 26 are mounted upon sleeves 28 which are interposed between the frame plates l-fl and the nuts 30 upon screw threaded ends of the axle 10.

The sleeves are a little longer than the width of the wheels 2th thus permitting free rotation of the wheels 26 without interference with the nuts 30 or the frame plates 1a.

Sleeves 32 are also mounted upon the rear axle 1'2 and upon the sleeves 32 are journalled wheels 34:. The axle 12 has its ends screw threaded for receiving nuts 36.

It will thus be seen that I have provided a wheel mounted frame. The rack bars 20 are slightly spaced apart as clearly illustrated in Figure 1 oil the drawings and are ribbed so as to be reinforced and of suflicient strength forhezwy duty work such as lifting of trucks, busses and the like.

The frame plates 14 are so arranged that the smallest angles of the plates are positioned at the forward end of the jack and receive the axle 10, thus permitting the ent1re lifting 1ack to be slid under an automobile or the like which has its axle or the like comparatively low.

Journalled in the frame plates 14; above the axle 1'2 and below the bolt 2a are a pair of stud bolts or stub axles 38. A pair of lifting arms a0 are pivotally connected at one end to the stub bolts 38. The stub bolts 38 have their screw threaded ends projected out beyond the side bolts 24 and have nuts received thereupon.

"l he Suitable washers elf} are intcrpo tween the arms etO and the inner sur' toes of the plates 14 as clearly illustrated in Iligure l ofthe drawings. The arms 40 are spaced apart and have the curved rack bars 20 received therebetween.

The arms it) have their two forward or free ends connected together by a pivot bolt 4a. The pivot bolt M in turn has a spacing sleeve 46 mounted thereon.

A lifting head or rod engaging member 48 is pivotally connected to the pivot bolt 4% and the sleeve a6 is received between the two side members of the load engaging head 4:8. l l

The side members of the load engaging head 48 are really received between the ping.

heads of the pivot bolt 44 and the ends of the sleeve 46.

The load engaging member 48 is substan tially yoke shaped in cross section and has its upper or connecting bar 50 cross sectionally ribbed and grooved as at 52 for providing a roughened surface to engage the load to be lifted and prevent possible slip- A pivot bolt is journalled in the side members of the load engaging head 48 and upon the ends of the pivot bolt on the outside of the side members of the load ea ing arms 40 together with the frame plates lland load engaging member 48 form a parallelogram whereby swinging movement of the load lifting arms upon their pivots 38, will always tend to maintain theload engaging member 48 in a vertical swinging position. i

In order to impart movement to the load lifting arms 40 relative to the rack barsQO which are fixed, I mount mechanism upon the load lifting arms themselves which engages the rack bars 20. i

The mechanism mounted upon the load liltingarms moves therewith and serves as a medium for imparting the necessary movement to the load lifting arms. J ournalled in the two spaced load lifting arms 40 is a pivot or siuiiporting bolt which has mounted thereon a pair of gears or pinions 62. l

The pinions G2 are spacedapart and are adapted to coact with the teeth of the rack bars 90. Integrally formed with the pinious is a ratchet wheel Gdwhich is formed in between the two gears 62 and projects into the space between the two spaced rack bars 20. y i i The pinions 62 and the ratchet wheel (i l are formed integral with asleeve 66. The sleeve 66 is formed with contracted ends 68 for defining shoulders 70, the purpose or which will hereafter be merc fully forth. The sleeve 66 serves as a spacer between the two arms '10. It may behere mentioned that the gears or pinions 62 coact with the rack bars 20 and that rotation of the gears will cause them to move upwardly or downwardly relative to the fixed rack bars 20. The means 01'' operating Ior rotating the gears (52 will hereinafter be more fully set :torth. 1t will also be seen that any rotation of the gears 62 upon their pivot bolt 60 will rause the lifting arms to which the bolt 60 is secured, to move upwardly or downwardly depending upon the direetionof rotation of the gears 62. i

The load lilting arms 40 swing; upon their pivots 38 and the rack bars 530 are arrualc in form with their center thesame as the center of the pivot bolts for the load li'lting arms. i l i A pair of spaced links 72 are mounted upon the sleeve 66 upon the contracted portions 68 thereof and rest against the shoulders TO. The links 72 project upwardly and are connected together by a connecting bolt 74. t i

The spacing sleeve 76 mounted upon the bolt *l'el and is received between the two lll) links 72. The links 2 are connected through the bolt 74 to a pair ofspaced pull bars 78.

The'pull bars 78 have their free ends con nected to an operating handle which I will n'ow describe in detail; 7 a

In order to actuate or operate my lifting jack 1 provide an operating handle 80 formed of a pair of spaced side members 82 which have their forwardfends jou-rn'alled upon the sleeve 18 mounted upon theaxle 12.

The rear ends of the side bars 82 are connected to a hand engaging piece 84 many suitable manner. A pair of upwardly extending plates 86 are fastened to the side bars 82 and-are pivotally connected to the a free or rear ends of the pull-bars 78.

i The connectionbetweenthe pull bars 78 and the plates 86 is formedby a bolt or the like It may be here mentioned that upward or downward movement of the operating-handle 8O willimpart a forward or rearward movement to the pull bar 7 8 which inturn will impart an osc'llat-ing movement to the links 72. 7

It is the movement of the links 72 forwardly o r rearwardly or which I have described as oscillatory, thatimparts the necessary movement to the mechanism carried by the lifting arms formoving the liftingarms.

The sleeve 76 hasformed integral there with a lifting pawl '90 which is adapted to engage the ratchet wheel 64 as clearly illustrated in Figure 2 of the drawings. A coil Y spring 92 is mounted upon the sleeve 7 6 and has one end in engagement withthe pawl and its other end in engagement with one of the links 72 thereby yieldingly tending to hold the pawl 90 in engagement with the ratchet wheel64;

The lifting pawl 90 andthe sleeve 76 are adapted to rotate upon-the bolt 74 andto move therewith when the bolt 74 is moved. 2

The lifting pawl 90 is actuated for rotating the ratchet wheel 64 which in turn causes the gears 62 to be rotated. -Alockingcor holding pawl 96 is formed integral with a sleeve 98 mounted upon a hearing or pivot bolt 100.

The pivot bolt 100 has its ends secured in the two spaced lifting arms 40. A coil spring 102 is mounted upon the sleeve 98' and hasone end in engagement with the holding pawl 96 and its other end in-en gagement with the arm 40. Both of the pawl's 90and 96 are designed to normallv I engage and coact withthe ratchet wheel 64.

Meansis provided for throwing the pawls 90 and 96 out of engagement with the ratchet wheel 64 and this means will be hereinafte more fully described. a

' Formed integral. with the sleeve 76 is an extension 104hav1ng an upstand ng lug 106 which serves as a cam surface for engaging a lever 108 operable for throwing the pawls 90 and 96 out ofengagement with the ratchet wheel. when the ratchet arms are lowered. V 2

Upon the sleeve 98 having the holding pawl 96 thereon, is a similar lug or extension 110 which coacts'with a cam surface. 112 upon the lever 108. The lever 108 is being formed integral with the sleeve 46 mounted uponthe pivot bolt 44.

A crank arm 114 projects downwardly from one end of the sleeve 46 and has a cable 116 or other flexible element 116 secured thereto. The cable 116 extends around the pulley 118 mountedupon one of the stud "bolts 3813s illustrated in Figure 4 of the drawings.

The cable then extends downwardly and around the pulley wheel 120 mounted upon the axle 12 as clearly illustrated in Figure 4 of the drawings. The purpose of arranging thecable 116 so that it passes around the center or pivot point of the lifting arms 40 and around the axle 12, is to permit free end of the spring a 126 simply extends through a small opening formed in the lifting arm 40as illustrated by dotted li-nes in Figure 5 of the drawings.

The tendency of the spring 126 is to move the lever 108 in the direction indicated by the arrow 128. The action of the spring 126 fscounteracled by the cable 116 and the control 122. a

l Vhen it is desired to release the-inactive spring 126 all that is necessary is to throw the control device 122' from the position shown in solid lines in Figure 2 to the position shown in dotted lines. This releases the cable 116 and gives itenough slack as to allow the functioning ofthe spring 126.

Practical operation for lifting increment 0 f m y .i' During the upward or lifting movement of my ack, the parts are as lllustrated 11: F ignre 2 of the drawings. That 1s, the lever 108 is held in inoperative position. In order to raise the arms 40 it is necessary to move 7 the operating handle 80 downwardly in the direction indicated by the arrow 130.

Movement of the operating handle in'the inovement of the operating handle 80 withr I direction indicated by the arrow 130. will impartmovement to. the pull bars '78 in the direction indicated by the arrow 132, The pull bars 78 being connected to the links 72 through llIO PlVOt' holt 74 will cause such links 72 to move in the direction indicated by the. arrow 134.

The links 72 pivot: upon the pivot bolt (50. The lifting pawl 90 being carried by the pivot bolt 74; is caused to u'iovc in the direction indi 'atcd by the arrow 132 imparting rotation to the ratchet wheel. (ill in the direc tion indicated by the arrow 130. V

The pinimis ('32 which are integral with the ratchet wheel 3-4; rotate in the same direction or as indicated in: the arrow 134:. Eotation of the pinions 62 in the direction indicated by the arrow 1% will cause such pinions to travel over the rack bars 20, therebv swinging the lifting: arms -10 upon their pivots.

After the lifting pawl rotates the ratchet wheel 0 ccrrestcudin5r to the length of one of the teeth thereoin then the operating; han die is moved in the direction opposite from the direction l11fllCtltC-ti by the arrow 130. Such inorcn'ient causes the pull bars to more in the direction opposite the arrows 11:12.

A forward or n'ioveinent opposite that in dicated by the arrows 181-. is imparted to the links 72, causing; the pawl ill) to simply fall. back against the ratchet wheel until it is in position to engage another tooth of the ratchet wheel.

The holding pawl 96 retains the ratchet wheels against possible rotation when the load is applied upon the load lifting arms l-0. During; the rotation of the ratchet wheel 64: in the direction indicated by the arrow 136, the holding pawl 96 simply presses against the ratchet wheel and follows alone; until it assumes the next below notch.

It will be seen that when upward move ment is desired, the ratchet wheel (5-11 is practically fixed to the links 72 through the pawl 90 and when it is necessary for the pawl 90 to assume another notch for imparting an other stroke to the ratchet wheel, then the ratchet wheel 0-1 held against movement in one direction by the holding pawl 96.

The holding pawl 96 as well as the ratchet wheel (34!: is mounted upon the load lifting arm 40 and is always in such position as to permit proper ci'igrarcincnt of the holding pawl 00 with the ratchet wheel 6 1 at all times.

The operation of the operating: handle 80 is repeated a suiiicient number of times until the gears or pinions 02 have traveled the entire upward length of the rack bars 20, thus elevating or raising: the load lifting end of the arms 40.

Practical operation for lowering movement of my, lifting jade.

In order to impart a downward morentieut to my load lifting}; inch it is necessary to swing; the control device 122 from the posiilion shown in solid lines in Figure 2, to the position shown in dotted lines in the same figure. a

The movement of the control device 122 permits the coil spring, 126 to throw the lever 108 rcarwardly or against the cam sur faces 100 and 110 respectively. The lever 108 when permitted to operate first assumes the position as illustrated in Figure 6 of the drawings.

The cam surface 112 is shown in engagcment with the cam 110. The spring 126 is much stronger than the springs for holding the liftiijio; and holding pawls in engagement with the witchet (i l. y

The result of the stronger spring 126 is to cause the pawls 90 and 90 to be thrown out of engagement with the ratchet wheels when the pawls are engaged by the lever 108. The Cain surface 112 being); in engagement with the cam 110 on the pawl tlti, forces the pawl 90 out of engagement with the ratchet wheel til and causes it to rotate in the direction in dicated by the arrow 138.

The lifting pawl is a sufficient distance away from the lever 108 S0 as not t0 be affected thereby. In order to impart downward movement to the lifting arms it is necessary to permit the ratchet wheel 64 to 1'0- tate in the direction indicated by the arrow 14:0.

The pull bars 78 are moved in the direction indicated by the arrow 142 by the upward movement of the operating handle 80. The load upon the load engaging member 18 tends to hold the ratchet wheel 64 in engagement with the lifting pawl 90.

The pull bars 78 being moved in the direction indicated by the arrow 142 simply allows the load to be lowered as the lilting pawl and ratchet wheel are moved. a a

The normal locking pawl 90 is held out of engae en'ient by the lever 108. As the liftinn" pawl moves forwardly or towards the direction of the lever 108, it will engage the lever 108 through the cam surface 106.

This movement forces the lever 108 against the action of its spring 126 and this movement in turn causes the cam surface 112 to he disengaged from the cam Surface 110, allowing; the holding pawl 96 to fall in engagement with the ratchet wheel 04: due to the spring: 102. a

The link 72 as illustrated in Figure 7, is being moved in the direction indicated by the arrow 142. The locking pawl 96 is shown in Figure 7 as just about in engagement with the ratchet wheel 04.

Further movement of the link 72 in the direction indicated by the arrow 1411 will cause the parts to assume the position shown in Figure 8 of the drawings, at which time the cam surface 106 is just about to disengage the ever 1.08 and tire, load be ng stipthe spring 92 to'throw the liftingpawl into engagement with the ratchet wheel 64" as illustrated in Figure 9 of thedrawings;

, The lever 108 is held against throwing the holding'pawl out of engagement bythe load itself which retains the ratch et wheel and holdingpawl in engagement.

The lifting pawl is brought to a position whereitwillengage one of the teeth in ratchet wheel 64 and as soon as itpicksup the load itrel'eases the load upon the holding pawl .96. 7 a H a As soon as the load is-released from'the holding pawl 96' then the lever 108 and its spring 126 pressing against the cam force the locking or holding pawl out of engagement with the ratchet wheel 64.

.Th-iscycle of operation is repeated and the load is lowered in a step by step relation- It will be remembered that the load itselfallows the lever 108 to function upon only one'of the pawls at a time. I

When the load is no longer upon the load I engaging member 18, then the spring 126 forces the lever 108 into engagement with,

both of the cam surfaces 106 and 110 upon the pawls 90 and 96, forcing them to assume the position shown in dotted lines in Figure 7 of the drawings, at which time the entire load lifting arm assembly will be permitted to drop and assume its normal starting position.

Both of the pawls being held out of engagement with the ratchet Wheel 64, permits it to simply rotate and allows the pinions 62 to travel downwardly upon the rack bars 20.

It will be noted that I have apair of rack bars 20 and this enables my lifting jack to be used for heavy duty work. The two spaced gears being connected together prevents any possible teetering of one gear relative to another and insures the load as remaining fixed and firmly supported upon the load lifting head or member 48.

I have illustrated the load lifting arms and stabilizing arms as made of a pair of members preferably of strap iron, although, it will be understood that-the lifting arms as well as the stabilizing arms may be formed integral with each other and made out of cast iron material.

One of the advantages of my jack resides in the arrangement of the ratchet wheel andincreasing the amount of leverage obtained for lifting of. the load. I 'It will be further noted that the entire load l'fting mechanism or mechanism whereby movement is imparted to the load lifting arms is supported and carried upon the load lifting arms themselves. v

The arrangement ,of' parts is such as to permit everything to be compactly arranged and to be practically received between the two side plates 1 1.- a

Some changes mayb nset in the details of constructio nand arrangement of the v'ari ous parts of my invention, without depart ing from thelreal spirit and purpose of my invention, and it is] my, intention to cover by my claims, any modifiedforms' of structare erase of mech nical e uivalents, which be reasonably included within'ttheir scope. a 1 V v I. claim as my invention: a

l. A jack comprising a pivoted lifting member anda support therefor, a fixed sector shaped rack bar on said support, a gear journal-ed on said lifting member and m0v able therewith and in mesh with said rack bar, means for rotating said gear for travel upon said rack bar and an operating handle pivotally connected to said support and a: pivotal connection between said handle and the pivot pointofsaid lifting member.

'2. A jack comprising a pivoted lifting member and support therefor, a sector shaped rack bar, a gear carried by said lifting member and forming a connection be tween said lifting memberand said rack bar, a ratchet wheel fixed to'said gear and movable therewith, meansfor ratcheting said ratchet wheel for imparting rotation to said gear whereby the travel of said gear upon said rack, bar will impart pivotal movement to said lifting member, said means compris= ing a link pivoted on the axis forming the axis of the ratchet wheeha lifting pawl pivoted to said link and an operating handle for oscillating said link. 7

3. A jack comprising a pivoted lifting member and a support therefor, a load engaging member pivoted on said lifting member, means for preventingthe pivoted load engaging member from swinging out of vertical during its movement. when the lifting member is swung on its pivot, a curved rack bar fixed on said support, said lifting member being pivoted upon an axis forming the axis of said rack bar, a gear in mesh with said rack bar and movable with said lifting member and ,means for rotating said gear upon said rack bar for imparting swinging 'movement to said lifting member.

l. A jack comprising a lifting member and a support therefor, an arcuate rack bar, said lifting member being pivoted upon an axis forming the axis of said rack bar, a

gear in mesh with said rack bar mounted upon said lifting member, and means for rotating said gear whereby the travel of said gear upon said rack bar will impart movement to said lifting member.

5. A jack comprising a pivoted lifting member and a support therefor, a pair of spaced curved rack bars, gears on said lifting member in mesh with said rack bars, a ratchet wheel interposed between said gears and fixed thereto, ratcheting means for said ratchet wheel, said gears thereby travelling upon said rack bars for imparting a swinging movement to said lifting member.

6. A jack comprising a pivoted lifting member and a support therefor, a pair of spaced curved rack bars, gears on said lifting member in mesh with said rack bars, a ratchet wheel interposed between said gears and fixed thereto, ratcheting means for said ratchet wheel, said gears thereby travelling upon said rack bars for imparting a swinging movement to said lifting member, and yielding means for rendering said rateheting means non-operative when no load is upon the lifting member.

7. A jack comprisinr a pivoted lifting member and a support therefor, a pair of spaced curved rack bars, gears on said lifting member in mesh with said rack bars, a ratchet wheel interposed between said gears and fixed thereto, ratcheting means for said ratchet wheel, said gears thereby travelling upon said rack bars for imparting a swinging movement to said lifting member, said ratcheting means being operable in either direction for swinging said lifting member in two different directions.

8. A jack comprising a pivoted lifting member and a support therefor,

a pair of spaced curved rack bars, gears on said lifting member in mesh with said rack bars, a

ratchet wheel interposed between said gears and fixed thereto, ratcheting means for said ratchet wheel, said gears thereby travelling upon said rack bars for imparting a swinging movement to said liftin member, said ratcheting means being operable in either direction for swinging said lifting member in two different directions, and means for ren daring said ratcheting means inoperative,

2). A jack comprising a pivoted lifting member and support therefor, a shaped rack bar, a gear carried by said lifting member and forminga connection between said lifting member and said rack bar, a ratchet wheel fixed to said gear and movable therewith, means for ratcheting said ratchet wheel for in'iparting rotation to said gear whereby the travel of said gear upon said rack bar will impart pivotal movement to said lifting member, said means comprising a link pivoted on the axis forming the axis of the ratchet wheel, a lifting pawl pivoted to said link, a pull bar pivoted to said linl: and an operating handle pivotally connected upon said support and to the free end of said pull bar, the pivot connection of the pull bar and the operating jacent the pivot point of said lifting member.

10. A jack comprising a lifting member and a support therefor, a fixed sector shaped rack bar on said support, a gear journaled on said lifting member and in mesh with sector handle being adsaid rack bar, means for rotating said gear for travel upon said rack bar, an operating handle pivotally connected to said support and a pivotal connection between said handle and said means and adapted to oscillate across the axis of the sector shaped rack ba Des Moines, Ia. July 23, 1926. i

LEONARD n. ulnson.

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