US2527841A

US2527841A - Hydraulic jack

Info

Publication number: US2527841A
Application number: US631710A
Authority: US
Inventors: Joseph J Mueller
Original assignee: Auto Specialties Manufacturing Co
Current assignee: Auto Specialties Manufacturing Co
Priority date: 1945-11-29
Filing date: 1945-11-29
Publication date: 1950-10-31
Anticipated expiration: 1967-10-31

Description

J. J. MUELLER HYDRAULIC JACK Oct. 31, 1950 2 Sheets-Sheet 1 Filed NOV. 29, 1945 1| F ,fx w. J

wf, y

' I INI/EN TOR.

L/ae'/ LVM/Jer Filed Nov. 29, 1945 2 Sheets-Sheet 2 45135 5@ 74 zg, gm

160 13 Z\ 154 g lllza 15E U 106 0 104 nn I' l Z5 WI 30 4g? 110 'm i775 if@ 164 JM INVENTOR.

Patented Oct. 31, 1950 UNITED STAT-ES PATENT OFFlClE.`

HYDRAULIC JACK Joseph J. Mueller, St. Joseph, Mich., assigner to Auto Specialties Manufacturing Company, St. Joseph, Mich., a corporation of Michigan Application November 29, 1945, Serial No. V631,710

' support and wherein the-jack has a vertically adjustable load carrying member which may be inserted preferably under the bracket which supports the bumper andl which jack includes hydraulic mechanism manually operable vfrom a position at the upper end of the jack and consequently substantially Waist-high of the operator, whereby the load carrying member of the jack may be quickly elevated to lift the deflated tire a suicent distance whereby the rim of .the tire will clear the ground to permit the tire to be removed.

Another object of the invention resides in providing, in the above kind ofjack, a load carrying member which is freely slidable vertically along a tubular vertically adjustable supporting mechanism by simply canting the load support to a released position whereby it may be shifted eithervertically upwardly or downwardly, and wherein the load support includes a construction such that the load will normally vcant the load support inan opposite direction,Y causing'it firmly to grip and maintain itself in any such adjustable load supporting position.

Another object of the invention resides in providing a bumper jack of the above type which has an upstanding ystationary round bar of considerable height and a surrounding sleeve `hydraulically shiftable vertically therealong .and forming a ram cylinder at its upper end and like- Wise carrying at its upper end a casting-like head having formed at itstop an oil containing reservoir, the casting or head being vprovided with two main borings extending transversely thereto in a direction longitudinally of the sleeve, one of which borings receives a high pressure pump piston reciprocable by a hand operated oscillatable handle mounted at the upper end of the jack, and the other boring providing the valve seats and including a valve thereon cohtrolling the passage of liquidfrom the reservoir to the pump and Vfrom the pump tothe ram cylinder, and this same boring also including a pres.- sure release valve for releasing liquid from the ram cylinder back 'to the reservoir, .the pressure release valve being operable in this last mentioned boring and froma point at vthe upper end of the jack. f

Yet another object of theinvention is to provide a bumper jack'm'echanismhaving a Vbase Yand ing member, vand the sleeve'having mounted on an upstanding elongated rod of considerabley length mounted on the base, said rod actingas a stationary piston and having an elongated, concentrically surrounding sleeve functioning as a ram cylinder, the sleeve carrying the load liftits -upper end a casting or head carrying a topmost liquid reservoir, the casting including two major bores, each disposed transversely to the longitudinal axis of the sleeve, one of the bores having a high pressure pump, cylindrical sleeve mounted therein and including an actuatable piston reciprocable in the sleeve and operated from a point at the top of the jack, and the other bore being provided with a plurality ofV valve seats seating thereon and controlling passages formed in the casting interconnecting the reservoir and the ram cylinder andthe high pressure pump piston, this last mentioned borelikewise including a perforated sleeve receiving therethrough a release valve operable from the out-f side of thecasting at the top of the jack, VVand which release valve controls the passage of liquid fromrthe ram cylinder to said last mentioned bore tothe release Valve and through a passage in the casting back to the reservoir by means Vof which arrangement both the high pressure pump and the release valve are actuatable from the top of the jack at substantially waist level of the operator, and whereby also the casting is provided with a minimum number of borings, and whereby the reservoir at the top of the jack is free of any release valve mechanism or any high pressure pump mechanism. Yet another object of the invention is to provide an improved type of load support for holding the bumper of an automobile in such a manner 'that the bumper is rather tightly gripped and the load supporting member adjusts 'itself to various types of bumpers in a manner toV cause them to be properly lifted during the operation of the hydraulic lifting mechanism.

Yet another object of the invention is to provide a pivotally mounted load support havingva more or less V-shaped socket wherein oney ofthe walls forming the V-'shaped socket and tnel op'- posite wall being relatively longerY and being/preferably concave to .provide an upper bumper contacting portion which in combination with the pivotal mounting of the load lifting member provides a universally adjustable load `lifter which automatically adjusts itself vto various types of bumpers whereby the same may be efficiently lifted.- Y

Another Vobject of Athe invention resides inpro- `viding a load lifting member which is adapted to slide vertically upon a smooth surfaced upright bar which embraces the bar and which is slightly tiltable in opposite directions whereby either to grip or release from the bar so that the load lifter may be adjustably slid longitudinally of the bar or alternatively may grip the bar to remain in stationary adjusted position.

Yet another object of the invention resides in providing a new type of load rest for a bumper jack wherein the load rest swivels around a pivotal pin so that it will follow the contour of any type of bumper when applied thereto, and so also that when the weight is applied upon the load lift the load lift will be lixed in preadjustable position with a firmer grip.

Yet another object of the invention resides in providing a load lifting member having a slot and a link chain depending therefrom carrying a hook on its lower end` and whereby also spring mechanism is provided in connection with a pvotally mounted load support for maintaining it in upward position while at the same time permitting it to be swung downwardly.

These and other 'objects of the invention will be apparent from a perusal of the following specification when taken in connection with th accompanying drawings, wherein:

Figure 1 is a iront view partially in section;

Figure 2 is a side view;

Figure 3 is a vertical section taken on the line 3-3 of Figure 1; Y

Figure 4 is a plan section taken on the line 4-4 of Figure 3 Figure 5 is an enlarged view, partly in section,l

of a canted position of the load lifting member; and

Figure 6 is a detailed view of the load support in adjusted position with the Imimper B supported thereon and showing the load support slightly lowered about the pivotal pin I'IE.

Referring to the drawings in detail, the jack shown in Figure 1 comprises a base 2 which may be of sheet metal and provided with a central opening 4 in which is xedly positioned a center support 6 provided with a well 8 having an opening therethrough to receive the base of an upright elongated round rod I2 which is adapted preferably to make a friction-tight t in the socket member 8 whereby to hold the rod or strut I2 in vertically disposed upright position. This strut I2 constitutes the stationary ram of an hydraulic unit. Concentrically surrounding this ram is an elongated sleeve I4 of considerable length. This sleeve comprises the ram cylinder of the jack. Its bottom end is cupped to a larger diameter as at I6 and internally threaded as at I 8 to receive a ring-like ferrule 20 likewise internally threaded to engage the internal threads I 6 .whereby to close the end of the sleeve I4. This ferrule 28 thus confines a packing 22 snugly around the inner diameter of the sleeve enlargement I6 and about the circumference of the stavtionary ram I2 while at the same time permit- 4ting the sleeve to shift lengthwise of this rod I2. The sleeve I4 is preferably provided with anannular indent 24.

The upper end of the sleeve I4 is threaded as at 26 threadedly to connect with the casting-like head 28, see Figure 3, which is preferably circular. This head 28 is provided with a depending shoulder 3l) internally threaded to engage the threads 26 of the upper end of the ram cylinder sleeve I4 whereby the head and the upper end of the ram cylinder sleeve I4 are xedly united to- 4 gether. This casting or head is likewise provided with an annular shoulder 32 adapted to form a seat for an elongated sleeve-like tube 34. The upper end of this tube is adapted to seat in an annular shoulder 36 in a relatively rugged and rigid casting or head 38 which is provided on its top surface with an annular roughened or serrated load receiving portion 40. In addition, the head is bored as at 42 and the walls of the bore are threaded as at 44 to receive the threaded end 46 of a rod 48 of relatively large diameter to pro- Avide a supporting strut for the cap 38. The bottom portion of this rod or strut 48 is threaded as at 54 `to threadedly engage internal threads of a circularly disposed bore 56 formed in the upper surface 58 of the casting or head 28. Through `the instrumentality of the rod 48 the reservoir sleeve 34 is tightly clamped against the shoulders 36 and 32 of the cap 38 and the head or castingr28, thus forming a reservoir space 68 and providing a load holding surface 48 at the top of the jack. It will be noted that there are no obstructions at the top of this annular cap so that it is free to act as a load support and constitutes the uppermost portion of the jack.

The casting or head 28 is compactly utilized as a means `for housing and connecting a high pressurepump, also as a means for housing the valves and the release valve mechanism which interconnects the reservoir, the ram cylinder and the high pressure pump cylinder, and it is done in a manner such that the cap 38 of the reservoir which forms the top of the jack may be utilized as a load lifting member. In order to accomplish this, the top of the cap must be free of any lupward extension such as release valves or high pressure pump cylinder, or any other projections which would prevent the load resting thereon. InA the present instance the casting or head 28 is provided with a radially extending bore 62 the external walls of which are threaded as at 64. This bore extends only part way inwardly radially of the casting but its outer end extends and connects with the outer Wall of the casting. A high pressure pump cylinder in the form of a sleeve 66 having externally threaded walls 68 screws into the threaded portion 64 so that the high pressure pump cylinder is rigidly mounted upon this head or casting 28 and extends radially outwardly thereof at substantially a 90 angle thereto. The outer end of this sleeve 66 is likewise provided with threads ,'Ill over which screws an apertured cap I2 which confines packing 'I4 against the outer walls of a high pressure pump piston 'I6 that reciprocates in this cylinder. The inner end of the piston is provided with the usual type of liquid packing 18, as is well known in the art. The outer end of the piston is provided with a cross pin which also passes `through registering apertures in the

furcations

82 and 84 of a handle socket 86 pivoted as at 88 to a post 90 mounted at 92 on a threaded plug 84 that threads into an opening formed in the casting or head 28. The handle socket 8E is provided with a socket aperf ture 96 which receives a handle 98. This handle is slotted as at |00 to enga-ge a pin I 02 formed inthe socket of the sleeve 96 so that the handle may be pulled outwardly, as shown in vertical position in Figure 1, where it may lie substantially parallel with the longitudinal axis of the sleeve I4, or by pushing inwardly, as shown in dotted line position, it will enter the socketSS of the handle and be operative to form a rigid 'osc'illatable member for oscillating ythe handle .c effige-,8411" ing the high' pressure' pump piston 16.

In addition, the casting-or'head' 28` isformedv with a second main bore which is formed in a' series of steps. This bore has a relativelylarger diametered portion |04 which terminates at the outer wall |06 of the head and this portion of the bore |04 is threaded. In addition there'is a"sli`ghtly smaller diametered portion |08 which is'untlireaded. This portion terminates in a seat ||0, hereinafter referred to, which merges into a smaller diametered portion l|2 in turn terminating in a conical seat ||4 and connecting with a still smaller diametered portion i8 which likewise has a conical seat ||8 andr which connects' with the smallest diameter 'of this second main bore, such as |20. The smaller portion o`f'this main bore connects by means of a liquidpassage |22 with the reservoir, see Figure'3.v In addition there is a bore |24, see Figure 4, which connects the inner bore 62 of the high pressure pump cylinder with the bored portionfl |-6 of the main bore, hereinbefore described. A'b'all valve |26 normally seats upon the valve seat ||8. A second ball valve |28 normally seats upon a conical seat H4, and a bore |30 connects that part ||2 of the main bore with the ram cylinder chamber |32. In addition, a cylindrical sleeve |34 lies in the bored portion |08 of the main bore and snugly ts therein. The end of this sleeve has a central aperture |36 therethrough which communicates with the bored Vportion l2. The end of the sleeve is provided witha conical outer wall |38which normally seats upon the conical seat H0 of the main bore and there is a hole |40 formed through the wall of the sleeve |34, which hole communicates with a conduit |42 which connects with the reservoir 60. In addition there is an annular groove |44 in the sleeve. The sleeve |34 is heldin position by means of a liquid-tight packing, which packing is held in place by means of a ring nut |48A having external threads engaging the kthreads |04 of the main portion of the bore. The outer end of the ring nut |48 is hexagonal as at |50 so that it may be turned to tighten the same. The inner walls of this nut |48 are internally threadedas at |52 to engage Vexterior.threads |54 on a release valve plunger |56 the outer end of which carries a capl |58 provided with aring |60 for turning the same. The shank |62'of` this release valve is provided with a conical end or point which seats upon a conical seat |64 and thereby closes ofi the portY |36 inthe sleeve |88'. This shank member |82 is the release valve, and when it is backedoff its seat |64 by means of the threads |54 thereof engaging the threads |56 formed internally` of the apertured nut |48, a connection is made between the ram cylinder chamber |32, the port |30, the port I2, the small port |36, the hole |40 in the sleeve |34, the port |42, and thence to the reservoir," s'o that liquid in the ram cylinder |32 can return to the reservoir 60.

It will thus be seen that by providing a single bore'extending from the outside face of the casting 28 inwardly and preferably diametrally of, afn'dlying in the axis of the port |30'connecting with the ram cylinder |32, I am enabled to not high pressure pump. Likewise I am enabledto" utilizeJ this same .bore as ay meansfor/enclosingv4 the'pressuref release" valve' Particularly"am" enabled by the use-'of the'sleevei inserted in'k the outer end of the` enlarged portion of this bore and held therein by means of the stationary nut |48, to provdethis release valve with means whereby it may be opened and closedA with'respect to its valve seat so thatY liquid may bev passed in a controllable amount from the ram cylinder chamber |32 back to the reservoir, and also by means of this insertable sleeve |34 I am enabled to utilize the ooncentrically within disposed release valve- |62 so as to pass relatively smaller volumes of liquid back from the ramcylinder to the reservoir during the relieving operation so as kto cause the load supporting ram cylinder t0 descend under the weight of the load.

With respect to an additional load supporting means for the jack, that is, in addition to the load supporting means 40 formed at the top of the jack andv located directly coaxial with the longitudinal axis of the jack, I provide a supplemental or additional load support member comprising `the elongated sleeve-likesaddle or bracket |66 having a central aperture and suitably formedY to provide a shoulder or biting jaw |58y andan oppositely disposed shoulder or biting jaw |10 which is spaced below the locus of the jaw i68 asshown by the dotted lines in Figure l'. It willy be noted that at |12 and also at |14 on opposite sides of the vinternal bore Yof the saddleV |86 the inner wall thereof is cut out so as to compel thejaw portions |68 and |10 to be relatively closeVv 'together on opposite sides of the sleeve i4 whereby when the sleeve is canted to the positionsh'own` in Figure 5, `the jaw members |10 vand' |68 are' shifted laterally so that they do not engage the:

, horizontal pin passing through a pair of spacedears in the saddle support and a coil springV surrounds the pin |16 betweenthese ears. OneV end of the coil spring takes against the under side of the load support |80 as shown in Figure 1,y

and the other end of the coil spring takes against the ring bracket |86, whereby normally resiliently to maintain the load support |80 in substantially horizontal position as shown in FigureA 1, by means of which resilient pivotal mounting the load support |80 may pivotally swing down'-v wardly to a position such as shownin Figure 6 which shows the bumper B in position supported in the load support with the lower portion of the bumper disposed in the indent or bottom of the V formed by the load support and with the convex wall of the bumper B contacting the upper portion of the load support. To this end the load support |80 is provided with a shorter wall |18 and an opposed longer upstanding wall which is generally concave and which at itsupper end terminates in a wall or top portion |84' which is adapted to Contact the 'outer'wall of the bumper .as shown in Figure 6. The bottom, of the pocket formed in the load support |80 between the walls |18 and |83 is shown at. |18. and it at this portion |19' that the bottonibf 7 thebumpei" rests when supported by the load support.- By means of this construction the load support may shift pvotally about the pin |16,

and due to the V-shaped construction of thisA load support it will automatically accommodate itself to various types of bumpers in a manner such that any particular bumper will be rigidly held with its lower portion in the indent |19 and its upper portion contacting the upper wall portion |84 of the bumper, thereby rigidly holding the bumper in adjusted position with respect to the load support and the jack during the lifting operation. It will also be seen that the ring |66 may be shifted in a horizontal plane around the vertical axis of the sleeve |4`to accommodate the jack to the bumper of the automobile in various positions of the base of the jack 2 in respect to the ground and to the bumper to be lifted.

The saddle support |68 is provided with a slot and an apertured link member |88 to which is connected another depending link |88 or a series of links terminating in a hook |98 which may be utilized for wrapping around and attending and hooking to any desired object upon which it may be desired to exert an upward lift.

As is Well known in the art, upon a. reciprocation of the hand operated high pressure pump piston 16, the liquid will be sent from the reservoir V[il] through the port |22 pastv the ball valve |26, thence laterally through the port |24, see Figure 4, into the high pressure pump piston. Upon the reverse movement of this piston in a direction towards the axis |30, this liquid will be expelled through the passage |24, thence into passageway ||8, thence past the ball valve |28, to the ram cylinder conduit |30, into the ram cylinder to raise the ram cylinder.

When it is desired to relieve the ram cylinder, the release valve |62 is backed off by unscrewing the threaded portion |54 thereof from the internal threads |52 without disturbing the nut |48, whereupon the liquid will cw from the ram cylinder through passage 38, through passages ||2, passages |36 in the sleeve, past the now open valve seat |64, through the opening |40 in the Sleeve, through the passage |42, back to the reservoir 68.

It will be apparent from the foregoing that I have produced a bumper jack which has hydraulic mechanism disposed at the upper portion of the jack substantially above the bumper, and wherein the high pressure pump piston is located at an upper portion of the jack but not at the top of the jack, and includes a handle member 98 which may be utilized by oscillation to reciprocate the high pressure pump piston 1S to raise the ram cylinder H4, thereby elevating either of the load carrying members 48 at the uppermost portion of the jack, or the load carrying saddle |18.

It will be apparent that by the arrangement of the casting 28 carrying the two main bores, one for the high pressure pump piston, and the other for the release valve and the valve mechanism which controls the passage of the liquid from the reservoir to the pump piston'and from the pump piston to the ram cylinder, and the release passage from the ram cylinder back toY the unobstructed top Vof the jack, whereby it may be utilized to lift a load to the maximum height, or alternatively I am enabled to utilize the adjustable load saddle |66 which is adjustably mounted vertically of the lower portion of the ram cylinder sleeve I4.

- It will also be apparent that by means of the simple construction of the sleeve or collar-like saddle support |66 havingthe opposed jaws or biting surfaces |68 and |18 I am enabled to provide these so that by canting the saddle to the position shown in Figure 5, when no load is on, the saddle may be adjusted up or down to a desired position and then shifted laterally to hold it in such position, it being particularly noted that when the load is on, the gripping effect of the two opposed jaws |68 and |10 is at a maximum. In addition the saddle support may be rotated around the cylinder I4 as an axis.

So also by the utilization of the pivotal mount- -ing |16 on the saddle support |66 the load receiving member |88 may be swung against the tension of the spring |81 to a downward position, and there is also combined with this pivoted saddle the depending chain and hook mechanism which may be utilized as a means for pulling effect by attaching it to an article to be pulled and then operating the hydraulic mechanism to raise the load saddle |18.

Obviously the invention is not limited to the specic details of construction disclosed herein but is capable of other modifications and changes without departing from the spirit and scope of the appended claims.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent is:

1. An hydraulic jack including in combination a base, an elongated strut mounted on and upstanding from said base to a suiiicient height that the top of the strut will extend above the bumper of an automobile, an elongated sleeve of suiiicient length to enclose a substantial portion of the strut and forming with the upper portion of the strut a ram cylinder, a head mounted upon and secured to the upper portion of said sleeve, means rigidly mounted on the top of said head and rigidly upstanding therefrom and forining a liquid reservoir, the top portion of said reservoir means having a load lifting portion and 'being otherwise unobstructed so that the load lifting portion may underlie and contact a load to be lifted, strut means supported from said head and enclosed within said reservoir for rigidly supporting the top of said load lifting portion from said head, said head having an internal bore terminating on the outer face of said head, said bore being disposed at an angle to the longitudinal central axis of said sleeve, a high pressure pump cylinder having one end mounted in said bore, a piston in said pump cylinder, there being means operably mounted with respect to said piston for reciprocating the same from a position adjacent said head, and said head including internal liquid carrying passages and ports interram cylinder and said reservoir.

2. An hydraulic jack including in combination a base, a strut mounted on and upstanding from said base to a suflicient height that the top of the: strut will yextendabove the bumper'of an autumnbile, an .elongated sleeve of sufficient length to enclose a substantial portion of the strut and forming with the upper portion of the strut a ram cylinder, a rigid head .mounted upon and secured tothe upper portion of said sleeve,.means rigidly mounted on the top of said head and .rigidly upstanding therefrom and forming a liquid reservoir, the top portion of said means rhaving a load lifting portion and being otherwise unobstructed so that the load lifting portion may underlie and contact a load to be lifted, means dis- ;posed axially of said reservoir rigidifying said load lifting portion of saidreservoir, said head having a main bore `disposed* therein at an angle with respect to the longitudinal central axis of the ram sleeve, 'spaced internal portions of said bore providing spaced valve seats, valves' normally closing said seats, a passage interconnecting a portion of said bore with the reservoir, and another passage connecting another portion of said bore with the ram cylinder, a Arelease valve adjustably mounted in said bore and a passage connecting said release valve with said reservoir Yand with said bore, a high pressure pump cylinder associated with said head, a piston reciprocating therein, means disposed on said head for reciprocating-said pump piston, and a passage in said head connecting said high pressure pump cylinder with said bore.

3. An hydraulic `jack including in combination a base, a strut mounted on and upstandingfrom said base to a sufficient height that the top of the strut willA extend above the bumper of an automobile, an elongated sleeve of sufficient length to enclose a substantial portion of the strut and forming with the upper portion of the strut a ram cylinder, a metallic head mounted upon and secured to the upper portion of said sleeve,

' means rigidly mounted on the top of said head and rigidly upstandingtherefrom and forming a liquid reservoir, rigidifying elongated strut extending upwardly in supported relationffrom the head and substantially axially of the reservoir for supporting a load lifting portion, the top portion of said means having a load lifting portion and being otherwise unobstructed so that the load lifting portion may underlie and contact ka load 'to be lifted, said head having a bore formed therein terminating on the outside wall of the head,

Ya high pressure pump cylinder mounted 'insaid bore and extending outwardly of the head, a piston reciprocable in said pump cylinder and extending beyond the outer end of said cylinder, a bracket fastened rigidly to said head and being formed with a pivot, a link pivotally lmounted tosaid bracket, a handle socket pivotally mounted on the outer end of said link, and a handle associated with said socket for oscillating said handle Vwhereby to reciprocate said pump piston, vsaid head having ported and valved means internally thereof interconnecting the high pressure .pump cylinder with the ram cylinder and with the reservoir, and release valve means associated with said head for likewise interconnecting the ram cylinder with said reservoir.

4. An hydraulic jack including in combination a base, a strut mounted on and upstanding from said base to a sufficient height that the top of the strut will extend above Athe bumper of an automobile, an elongated sleeve of sufficientk length.

to encloseia substantial portion of the strut and forming with the upper portion of the strut' a V:ram cylinder, a metallic head` mounted upon and secured Ytothe upper portion of said sleeve, a cylindrical Vsleeve rigidlymounted vcn thetcp of said head and upstanding therefrom, a relatively rugged post centrally mounted on the top portion of' said head and upstanding therefrom in spaced relation from said cylindrical sleeve, a relatively rigid cap mounted upon the upper end of said post and clampingly engaging said cylindrical sleeve between said cap and saidghead whereby the space within said cylindrical sleeve forms a liquid containing reservo-ir, said cap having its top formed as a load lifting member, a high pressure pump cylinder mounted upon said head, a plurality of passages formed in said head and interconnecting the highv pressure pump cylinder with the reservoir and with the ram cylinder, and a release valve associated with said head .and

ad-justably .interconnecting or disconnecting said ram cylinder with said reservoir.

5. Inan hydraulic jack, the combination of a base, elongated, relatively shiftable members mounted upon .said base and forming a ram piston and a ram cylinder, one of which is stationary, a `metallic head carried by theupper end of one of said members, a sleeve forming a liquid containing reservoir mounted uponand upstanding from the top of said head, a rigid diskV closing the outer upper end of said sleeve yand forming a load lifting support, said support being otherwise unobstructed whereby said load disk may be inserted under a 'loadand upon elevation thereof will contact and raise said load, a rigidifying strut'havin'g itsopposed ends threadedly engaging bores formedin said head and disk for holding said disk and sleeve and strut in rigidassembled relation, said head being provided withinternal passages-and valve-means associated there- With interconnecting said reservoir with'saidram cylinder, a high pressure pump mounted upon said lhead and including a cylinder, a piston therein, and means located on said head for operating said piston, said head including in- -ternal valvedpassages interconnecting the high -pressurefpump cylinder with the reservoir and -with the ram cylinder, and a release valve associated with said head, said release valve having means in said' head connecting to said reservoir and to said ram cylinder.

l6. A`n hydraulic jack comprising a base, an elongated strut mounted upon `and upstanding `from said base, an elongated sleeve concentri'cally surrounding said strut andV extending'upwardly therefrom and Vhaving a relatively smooth external surface, ahead rigidly mounted on the upperend of 'saids'leeve and forming withth'e Vinterior upper portion of 'said sleeve, a ram cylinlder chamber, means'mounted upon'the top 0f Iand upstanding from said' headforming a liquid lcontaining reservoir,V a high pressure pump mounted upon said head, means associated with said pump for operating the piston thereof, .valved .and'ported'means formed in said head for interconnecting the reservoir with the ram cylinder and vwith the 'high vpressure pump, a release valve formed-in said head and interconnecting said ram cylinder and said reservoir, a load lifting saddle support-having portions embracing said sleeve andslidable therealong, the internalwa-lls of said embracing support providing substantially Ydiametrally opposed gripping jaws which are .spaced aparty in -a direction longitudinally of. the axis of said sleeve, said gripping jaws beingl positioned relatively close 'together on opposite sides of said embracing Vsupport the internal walls of said embracing support being formed to permit a v-lateralgtilting of saidembracing support kon :outer relatively-smoothewalls-of said sleevewhereby in one laterally tilted position said jaws are adapted to grip said sleeve andmaintain said embracing support in adjusted position relatively `thereon while in another adjusted position said embracing support is adapted to slide freely along said sleeve, and means forming a Work holding surface mounted upon said embracing support.

7. An hydraulic jack comprising a base, an elongated rod mounted upon and upstanding from said base, an elongated embracing support concentrically surrounding said rod and extending upwardly therefrom and having a relatively smooth external surface, a head mounted on the upper end of said sleeve and forming with the interior upper portion of said'sleeve a ram cylinder chamber, means mounted upon the top of said head forming a liquid containing reservoir, a high pressure pump mounted upon said head, means associated with said pump for operating the piston thereof, valved and ported means formed in said head for interconnecting the reservoir with the ram cylinder and with the high pressure pump, a release valve formed in said head and interconnecting said ram cylinder and said reservoir, a load lifting support embracing said sleeve and slidable therealong, the internal walls of said support providing substantially diametrally opposed relatively sharp sleevebiting and gripping jaws which are spaced apart in a direction longitudinally f the axis of said sleeve, said gripping jaws being positioned relatively close together on opposite sides of said embracing support the internal walls of said support being formed to permit a lateral tilting of said support on outer walls of said sleeve whereby in one laterally tilted position said jaws are adapted to bite into and grip said sleeve and maintain said support in adjusted position relatively thereon while in another adjusted position said support is adapted to slide freely along said sleeve, and a load support pivotally mounted on said embracing support, said load support being shiftable 'to various positions' to adapt it to various bumpers.

8. An hydraulic jack comprising a base, an

elongated rod mounted upon and upstanding from said base, an elongated sleeve concentrically suriupon said head, means associated with said pump for operating the piston thereof, valved and ported means disposed in said head for interconnecting the reservoir with the ram cylinder 'and with the high pressure pump, a release valve disposed on said head and interconnecting said ram cylinder and said reservoir, a load lifting `saddle support comprising an elongated sleeve surrounding said first mentioned sleeve and slidable therealong, the internal walls of said elongated sleeve providing substantially diametrally opposed relatively sharp sleeve-biting and gripping jaws which are spaced apart in a direction longitudinally of the axis of Said elongated sleeve, said jaws being also positioned relatively close together on opposite sides of said elongated sleeve the internal walls of said elongated sleeve being formed to permit alateral tilting of saidelongated sleeve on outer walls of said first mentioned sleeve whereby in one laterally tilted position said jaws are adapted to grip said first mentioned sleeve from said base, an elongated sleeve concentrically surrounding said strut and extending upwardly therefrom and having a relatively smooth exterior, a head mounted on the upper end of said sleeve and forming with the interior upper portion of said sleeve, a ram cylinder chamber, means mounted upon the top of said head forming a liquid containing reservoir, a high pressure pump mounted upon said head, means associated'with said pump for operating the piston thereof, valved and ported means disposed in said head for interconnecting the reservoir with the ram cylinder and with thel high pressure pump, a release valve disposed on said head and interconnecting said ram cylinder and said reservoir, a load lifting saddle comprising a second elongated sleeve surrounding said iirst mentioned sleeve and slidable therealong, the internal walls of said second sleeve providing substantially diametrally opposed sharp sleeve-biting and gripping jaws which are spaced apart in a direction longitudinally of the axis of said sleeve, said jaws being also positioned relatively close together on opposite sides of said second sleeve the internal walls of said second sleeve being formed to permit a lateral tilting of said second sleeve on outer walls of said first sleeve whereby in one laterally tilted position said jaws are adapted to grip said first sleeve and maintain saidsecond sleeve in adjusted position relatively thereon while in another adjusted position said second sleeve is adapted to slide freely along said first sleeve, and a load holder pivotally mounted von said second sleeve, said load holder being pivotally shiftable to a position to remove it from`load receiving position, said load receiving holder being slotted. a chain disposed in said slot and depending downwardly therefrom to a position alongside the length of said first sleeve.

10. An hydraulic jack including in combination a base, a strut mounted on and Yupstanding from said base toa suiiicient height that the top of the strut will extend above the bumper rod of an automobile, an elongated first sleeve of suiicient length to enclose a 'substantial portion of the strut and forming with the upper portion of the strut a ram cylinder, a head rigidly mounted upon the upper end of said elongated first sleeve providing, with the upper end of said strut, a ram cylinder chamber, the top portion of said head having a countersunk shoulder formed thereon and a central internally threaded bore, an elongated reservoir forming sleeve having its lower end resting in said annular shoulder, a relatively rigid cap having an annular shoulder on its outer lower wall to engage the upper end of said last mentioned sleeve, the underside of said cap being provided with an internally threaded bore and the top surface of Said cap being formed to vprovide a load receiving seat, and an elongated rigid second strut having its axis lying in the axis of the first mentioned strut and having its upper and lower ends threadedly engaging the threads of the bores of said head and said cap for clamping the reservoir forming sleeve between said head and said Cap, said sleeve, cap and head forming a reservoir for the reception of an hydraulic liquid.

l1. A hydraulic jack comprising in combination a base, an upright strut mounted on the base, a member movable relatively to the upright member, and means fol` moving the strut and member relatively, said second member having a smooth outer surface, and a load lifting sleeve having an inner wall embracing the smooth surfaced member, said inner wall providing opposed relatively sharp edged jaws spaced longitudinally of the sleeve, said opposed jaws being formed relatively close together on opposite sides of said sleeve, the bore of the sleeve member surrounding said smooth surfaced member including counter sunk portions disposed in association with'the jaws to permit the load lifting member to tilt relatively to the smooth surfaced member whereby to slide freely therealong to various positions of adjustment or alternatively to cause the jaw portions to bite into said smooth surfaced portion to hold said load lifter in load lifting adjusted position.

12. A jack comprising in combination a base, an elongated strut mounted on and upstanding from the base, an elongated sleeve shiftable vertically along said strut, said sleeve having an outer smooth wall, a load lifting member including a shorter elongated sleeve embracing said smooth wall and having a bore provided with relief portions spaced from said smooth wall and other portions more closely fitting said wall than said relief portions, the inner wall of the bore f said shorter sleeve being cut formed with countersunk portions providing relatively sharp spaced jaws, said jaws being spaced longitudinally of the sleeve but placed thereon relatively close together on opposite sides of said sleeve whereby tilting of said shorter sleeve relatively to said sleeve shifts the shorter sleeve so that the load lifter may be slid freely along said sleeve or to cause the jaws of said shorter sleeve portion to bite the sleeve and grip the same.

13. A jack comprising in combination a base, a strut mounted on andupstanding from the base, an elongated sleeve shiftable vertically along said strut, said sleeve having an outer smooth wall, a load lifting member including a shorter sleeve embracing said wall and having a bore provided with relief portions spaced from said smooth wall and other portions more closely fitting said wall than said relief portions, the inner wall of the bore of said shorter sleeve being provided with spaced relatively sharp biting jaws,

said jaws being spaced longitudinally of the slee'v but positioned thereon relatively close together on opposite sides of said sleeve whereby tilting of said shorter sleeve relatively to said smooth wall of said elongated sleeve shifts the shorter sleeve so that the shorter sleeve may be slid freely along said elongated sleeve or to cause the jaws of said shorter sleeve to bite the smooth wall of said elongated sleeve and grip the same and wherein said shorter sleeve is turnable about the axis 4of said elongated sleeve as an aXis.

14. A jack comprising a raisable element having an outer smooth surface of circular cross section, a work holder support comprising an elongated sleeve having inner wall portions formed by cutting away the metal of said wall to provide relatively sharp biting jaws disposed relatively close together, but on substantially dia` metrically opposite sides of said sleeve bore to provide integrally relatively sharp and spaced gripping jaws, said sleeve being tiltable to slide freely along said smooth surface and tiltable in another direction to cause said jaws to bite into said smooth surface to grip the same, said work holder sleeve being axially turnable about said smooth surface to various positions of adjustment, and a saddle member pivotally mounted about a horizontal axis on said work holder sleeve and having a bumper receiving socket of somewhat V-shaped conformation adapted to receive the bottom of a bumper in the bottom of the V and having another wall portion spaced above said bottom of the V for engaging a portion of a bumper above the bottom edge of the bumper.

JOSEPH J. MUELLER.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Great Britain Nov. 22, 1937