US1329665A - kopf and f - Google Patents

Description

J. C. KOPF AND F. H. SCHWERIN.

HIGH SPEED JACK.

APPLlCATlON FILED JULY 15. 1919.

1,329,665. Patented Feb. 3,1920.

I SHEETSSHEET l- 1. c. KOPF AND F. H. SCHWERIN.

HIGH. SPEED JACK. APPLICATION FILED JULY 15, 1919! 1,329,665. e Patented Feb. 3,1920.

I$HEETSSHEET 2- J. C. KOPF AND F. H. S GHWERIN.

HIGH SPEED JACK.

APPLICATION FILED JULY 15, 1919.

1,329,665; Patented Feb. 3,1920.

7SHEETSSHEET 3.

" ATTORNEY J. C. KOPF AND F. H. SCHWERIN.

HIGH SPEED JACK.

APPLICATION FILED JULY 15, 2919.

l 329 ,665, Patented Feb. 3,1920.

7SHEETS-SHEET 4- E/VT 2 45 45 42 J. C. KOPF AND F; H. SCHWERIN.

HIGH SPEED JACK.

APPLICATION FILED JULY 15, 1919.

1,329,665. Patented Feb. 3,1920.

ISHEETSSHEET 5.

%/t 0 IV E T0198 ATTORN EY J. C. KOPF AND F. H. SCHWERIN. H l G H S P E E D J A C K.

\FPLICATI Y 15, 1919. A 1,329, 5, Patented Feb. 3,1920.

T EEEE TS EEEEE 6.

l. C. KOPF AND F. H. SCHWERIN.

HIGH SPEED JACK.

APPLICATION FILED JULY 15, 1919- Patented Feb. 3, 1920.

7 SHEETS-SHEET 7- ,4 TTOR/VEY UNITED STATES PATENT OFFlCE.

JOHN C. KOPF, OF BELLEVUE BOROUGH, AND FRANK H.

SCH'WEBIN, OF WESTVIEW BOROUGH, PENNSYLVANIA, ASSIGNGRS TO THE DUFF MANUFACTURING COMPANY, OF PITTSBURGH, EPENNSYLVANIA, A GGRPORATION OF PENNSYLVANIA.

HIGH-SPEED JACK.

Specification of Letters Patent.

Application filed July 15, 1919. Serial No. 310,965.

To all whom it may concern:

Be it known that we, JOHN C. Kort and FRANK H. ScnwnnIN, citizens of the United States, and residents, respectively, of the borough of Bellevue, in the county of Allegheny and State of Pennsylvania, and of the borough of West View, in the county of Allegheny and State of Pennsylvania, have invented a new and useful High Speed Jack, of which the following is a specification.

The object of the invention is to provide an improved high-speed heavy-duty screwjack. A high-speed screw-jack possesses a screw having a pitch beyond the angle of repose, so that the jack is self-lowering under load and will run down as fast as permitted by a self-locking lowering mechanism having an overrunning connection. A separate operating mechanism actuates the screw in the direction for lifting independently of the self-locking lowering means, which through the overrunning connection is ever ready to hold the screw against descent.

Lar e jacks of this character with which we are familiar have been organized to carry their operating mechanisms in large overhanging rotatable heads, and have been dangerously top-heavy, awkward to move about and position, inconvenient to operate, and liable to bend their screws. The purpose of the present invention is to construct a jack of the kind specified which shall be non-toppling, strong and durable and protected in respect to its screw, easy to handle and convenient to operate, and which shall be well adapted for manufacture. In its preferred embodiment the jack has a relatively broad base with a'relatively narrow hollow standard portion and a lower annex portion applied at the rear or side, all incased to be packed with grease, a ram slidable and held against rotation in the standard and bearing a relatively narrow head, a nut in the lower part of the ram, a steeppitch screw rotatably supported on the bottom of the base and extending upward through the nut and freely within the ram, lifting means and self locking lowering means with overrunning connection, all assembled in the annex of the base, and operating through a common vertical axis upon the lower portion of the screw. Means are further provided for coupling the lowering means with the vehicle shaft in order to effect positive lowering of the ram when the latter is free of load and will not descend of itself.

A further object is to minimize sink-back of the load-lifting member or ram after each stroke of the lifting handle. This is accomplished by means of what may be termed a Vernier or graduated action overrunning clutch between the self-locking means and the screw, having a plurality of pawls which act successively so that the screw is held at fractional tooth distances.

The bi-laterally symmetrical oblong base is equipped with truck wheels, normally clear of the ground, on the lower part of the annex portion, whereby the jack can be readily tilted and wheeled about and up to the point of use, and when released settles upon its base without danger of overturning. According to a further feature of the invention, the same long bar handle serves interchangeably for operating the lifting means and as a handle for trundling the jack.

Another part of the invention, having to do with the manufacture, alinement and rigidity of the jack, relates to a sectional construction of the base, including in this term the inclosed supporting frame as a whole.

Still another feature relates to means whereby the pinions of the lifting and lowering mechanisms may be readily and accurately centered with respect to their gears, which is a matter of substantial importance in view of the heavy loads which the jack is required to lift.

Further objects and features will become apparent as the specification proceeds.

In the drawings forming a part hereof:

Figure 1 is a side elevation of the jack tilted for wheeling, truck fashion;

Fig. 2 is a rear elevationshowing the bar handle socketed in the lifting rocker and representing in broken lines one of the lifthandles in its horizontal or operative position;

Fig. 3 is a vertical section taken in the central axial plane of the standard and annex portions; v

Fig. 4t is a vertical section through the Zfacesof the annexsection lie in a vertical 'annex' at right angles to Fig. 3, the plane of the Section being indicated therein at Fig. 5 is a horizontal section on the l1ne 5-5 of Fig. 3;- v

Fig. 6 is a' horizontal section through the annex on the line 66 of Fig. 4:;

Fig. 7 is a horizontal section on the line 7 7-77 of Fig. 4:, lookingup; r

' Fig. 8 is a horizontal section on the line 88ofFig.3;'

Fig. 9 is a View partly in elevation and partly in vertical sect-i011 showing the parts in the upper port-ion of the annex;

' Fi '10 is a ers aective detail view of an element seen in Fig. 9;

Flg. 11 1s an elevation of the common vertical operating shaft; and

Fig. I2 is a detail vertical section of a warning signal. V r

The inelosed base frame as a whole is designated 7 1. It comprises a relatively broad bottom or base portion proper 2 1 oblong dimensions, a hollow, preferably cylind'ric'al, standard portion '3, and an annex or extenslon portlon t lower than-the standard portion and located at the -'region which be termed the back of the jack. Transverse, axles '5 pass through tubular housing bottom section 8, a relatively narrow stand- 7 ard section '9 {having a widened *lo'we'r [portion 10 to conform with the bottom section whereonit rests, and an annex section or hood 11-, which is applled against the backs of the ether twose'etions' The interiors of the sections, where they meet, are open to each other, so as to form one general inter ior. T he bottom section has an upwardly projecting, partly circular, inner flange 12 forming a 'rabbet, which is machined to -receive the machined, partially circular lower rim "13 er the standard section, whereby these two se tions; are 'alined, "The inner-edge plane against corresponding machined. surfaces of the standard and bottom sections, as indicated at 14 in Fig. 5, so that by, aid of bolts 15the whole is locked rigidly together, the-sections being further interlocked by side flanges 1'6-on the lower, part of the standard sectionem'bracing the annex section, as

" seen in Fig. 1, and by a lug 17 on the upper part of the standard section fitting a recess in the top of the annex, as indicated in Fig. 3. At the bottom, a finished surface on the annex section rests at 18 upon a supporting surface on thesection 8. V

The sa d bottom section has a circular up ward projecting'rib 19 formed therein, in

concentric relation to the alining flange 12, for the purpose of affording a centering seat for broad end-thrust ball-bearing which rotatably supports an upstandlng screw 20. Said bearing cemp'rlses a bottom circular ball-plate 21 having a central opening ,contaming a side-thrust bearing bushing 22,.an

upper ball-plate 23 tight on a reduced'unthreaded'lower portion 2i of the screw, and an interposed seriesofba'lls'25. A large gear '26 is fixed rigidly on the lower part of the screw, against ashoulder 27, and-applies the load to the upper ball-plate. The

lower end of the screw shaft projecting below said upper ball-plate formsa ournal 28, which revolves in the bearing 22.7

A long circular shde-bearlng 29 1S inac'hined at the top upon the interior of the standard 9 concentric with its bottom alining rim 13'; and in this bear'ing'works -cy-' lindrica-l ram A longitudinal groove 31 formed in the exterior of the ram re.- ceives a vertical spline 32 held by screws-33 in the upper part-of the standard and keeps the ram from turning as it moves upand down. A relatively small diameter head 34;, of approximately the'width of the standard '9, is fixedto the upper end of the ram, of -whi'ch it forms a part, the head having a downwardly projecting, interior, circular flange 35, which enters the ram and is there secured by screws 36. A packing gasket 87 in a groove in the bearing portion of the standard just below the top opposes thejescape of, grease when the ram ascends and keeps out dirt and grit when the ram descends and a screw plug 38 in the head perinits of theintroduction of the lubricant -I1'1 the lower end of the ram, against a shoulder 39, is fixed -a nut 40, through which the screw 20'passes'into. the interior of the ram, where all its portion abovethe nut standsfre'e. Both the screw and the nut have a pitch beyond the angle offrepose,

so that with load upon the head'the ram will slide down if permitted, the nut rotating the screw. 7

The annex-section of 'the base is cast with interior webs or'brackets-ll, 42, 43, near the'top andbottom and at an intermediate point, respectively, whicharebored fo'r bearings. @pening's are "provided in the top and bottom of the annex, in-line with the bearings, for the purpose of boring and to per m'it assembling and disassembling, and are closed by screw plugs li-"and 45. In the said bearings is journaled a vertical operating shaft 4-6 common to the mechanism about to be described. 1

On a fluted portion 47 of the shaft immediately above its lower journal portion 48 is fixed a spur pinion 49, which meshes with the gear 26 on the lower part of the screw. An upwardly facing bevel gear 50 is fixed on the same fluted portion of the shaft, immediately above the pinion 49.

This gear will be termed for convenience the lifter gear. With it meshes a bevel pin-- ion 51 carried by the inner portion of a transverse lifting shaft 52, which passes through one side of the annex. on its outwardly projecting portion is an oscillatory pawl rocker 53, which embraces a ratchet wheel 54 on a hexagon section 55 of the shaft. The rocker has a socket 56, which receives the tapered butt end of a long bar handle 57.

Above the intermediate bracket 43 the vertical shaft 46 bears a ratchet-wheel 58, fastened thereon by a key 59, said ratchet wheel constituting the driven member of an overrunning clutch. The driving member of said clutch is carried by a part free on the cylindrical portion 61 of the shaft next alcove the ratchet. The lower portion of said free part has a depending circular flange 62 encircling the ratchet and formed with recesses 63 wherein a plurality of pawls 64, in this instance three, are pivoted on vertical pins 65. Springs 66 fastened to pins 67 in the recesses and strained over other pins 68 bear against the backs of the pawls and press the same into engagement with the teeth of the ratchet.

The relation between the pawls and th ratchet is such, it is to be observed, that the pawls engage the holding faces of the ratchet teeth in succession. This is most conven iently accomplished by equally spacing the pawls, and making the teeth on the ratchet of a number not a multiple of the number of pawls. The result is that, in lifting, the

ram cannot sink back a distance proportional to more than a fraction of a ratchet tooth.

The upper portion of the. part 60 is formed with the teeth of a self-locking gear 69, which is meshed by a self-locking worm pinion 7 O on a transverse lowering shaft 71. By self-locking is, of course, meant that the gearing is irreversible, so that pressure applied by load on the ram and eventually transmitted to the worm pinion 7 0 is there solidly sustained, and consequently the lowering shaft must be turned in order that the ram may be allowed to descend. In thisway lowering is effected rapidly and with little manual effort, since all that is required is to let off on the holding means, the ram being driven down by the load.

The lowering shaft 71 is located above the lifting shaft 52 and in a vertical plane perpendicular thereto. Its inner end is journaled in a bearing aperture 72 in the portion of the annex section 11 which abuts the standard section 9, and its outer portion is journaled in a bearing 73 in a gland 74,. which is screwed into an opening in the rear wall of the annex. The outer end 7 5 of the lowering shaft, withinsaid gland, is squared, and the gland is recessed to permit the insertion of the socketed stem 7 6 of a removable rotary crank handle 77.

The 'land 74 has a cylindrical portion 78 inwardly or forwardly of its screw-threaded portion 79, and said cylindrical portion fits closely an accurately formed cylindrical portion of the opening in the annex wall. Similarly, the liftingshaft 52 is journaled in a gland 81 having screw-threaded and smooth portions 82 and 83, the latter fitting an accurately formed opening in the frame In this way the driving pinions are exactly centered with respect to their gears, which particularly in the case of the lifting mechanism is important.

Through the overrunning clutch the self locking lowering means is connected with the vertical operating shaft assemblage, and thereby with the screw, in one sense only. This enables the lowering means, by rotation of its handle in one direction, positively to operate the train of mechanism to raise the ram, as is useful in running it up quickly to the load. When the handle is turned in the opposite direction it also enables the lowering means to let off on the steep-pitch screw so that thelatter runs down under load, as heretofore explained; and when the lowering means is left stationary, the lifting means operated by the long pump handle 57 can operate the mechanism below the clutch and force the ram upward independently of the lowering means, which because of its self-locking character blocks the effort of the ram to descend as soon as manual lifting force is no longer applied to the handle.

When the ram is elevated and load is absent, it will not run down of its own accord, however, if the crank-handle 77 is turned in the direction for lowering, because its weight is not suiiicient to overcome friction. Means are hereby provided whereby the lowering means may be coupled to the train of mechanism, for positive lowering ofthe ram, so that the lowering means will then .drive the common vertical shaft or member 46 and therefore the screw in the direction in which the overrunning clutch would ordinarily act idly. Such coupling device may be embodied in various forms, but preferably it comprises a clutch collar 84 movable vertically on a portion of the shaft, above the free part 60, having ribs 85which are engaged by slots in the collar. Said collar has a downwardly-projecting rim 86 formed on its edge with ratchet-teeth 87 facing in the desired direction, and cotiperative with a complementary ring of teeth 88 on the top of the part 60. A spring 89, interposed between the clutch collar and the part'6'0,nornially holds the collar raised sufficien tly to keep the teeth out of engagement. The clutch member is actuated against the pressure or the spring by means of a yoke 90, which straddles the upper end of the shaft 46 The limbs 01 this l eleinent are'slidable in grooves 91 inthe top journal portion 92 of the shaft-within the top bearing 4:1, and at 'their lowerends are out-turned feet 9 1 which bear against-the top of the clutch collarSi T he yoke isdepressible by a button until 95 on the: top of the annex chamber, having a stem 90 passing through an aperture in theftdp-plug ed and riveted below to: a plate 9'? resting on the upper end or the yoke;

' The samei'ibs-SS, which permit-the clutch ni'einber 84 to'n ove vertically on the shaft whileliolding it thereto against relative rotat'ion, are 'irt-ilized for retaining a locking ring 98, the function of which is to hold the part in place upon the middle bracket 13 The sai'cl'i-i-iig, as seen in Fig.7, is formed with slots 90 arranged to pass over the ribs, whereby the collar can be slipped downward it lies in a groove or narrow unribbed Zone 100 V where a partial turn brings its solid portions beneath the lower ends of the ribs, so that V the latter tllOlr blOCk the collar against rising.

restrainedby the -weight disposed at the] In this position the collar is held against turning by one Or more set-screws 101.

- Thelong handle 57 whichv is usedinthe so'cket 56 tor lifting, by rotation of the screw effected by manual pump action, is also made ava-ilable as the-handle for tilting the jack and rol-lingit about on its truck wheels 7.

; i For this pii'rfposeits lower end is placed, in 40 stead of'in the -roc'ker soc'ket,ina fixed socket 102 on; the'lower back part of the. annex, and its intermediate part is slipped between a Pal 11 6f lugs-103, and there 'held b-y a transverse pin 104 -passed through registering holesp-rovided in the lugs and bar. With 7 this-condition, with the handle secured subht on the back 01"" the ack,

stantially upl" b it is a simple matter to reach up and grasp the u'pper'part of the handle and tilt the jack oii' its flat bottom onto the wheels, and then to niove it about as desired. In this operation, the center of gravity being low, there 'is' no danger of overturning in event of one of the. wheels riding over an obstacle;

and-when the jack is tilted forward and the handle released, it settles promptly upon its bottom without tendency toro'ckover, being back in {the annex.

Carrying handles 105 are pivoted at 106 tooppo'site sides of the base at about the level of the top of the annex and substantially' i'nthe -'vertical plane with the center of gravity. These handles are angled adjacent their pivotpoints, so that upon raising then oithe shaft justabove thepart 60,

the shoulders thus provided abut against the sides ofthe base and rigidly sustain the handles in the horizontal,carryingpositio-n.

A warning signal is provided to indicate when the raln has been lifted approximately to theliniit of safety. A dog 107 is pivoted at 108 between lugs 109 on the standard, at the "region of the bearing 29; The Wallet the standard is slotted-to permit the nose on the lower end o'f-the dogto"beartl'srough the slot upon the side of the rain, under the action of a spring 110. H Tlie-rain-hasa lll-ne'ar'the lower end, telinill-atillg'in an abrupt shoulder 112, the recess and shoulder being in Vertical linefwith the'warn-ing signal. ll hen the rain has been raised totlie permissible li-nrit, the nose of the dog cl-reps into the recess, and when it encounters "the slit-udder the resistance to further ni'oveiixent indicates to the operator that lie-"has gene fa r enough. If he continues to forcethejack,

shearsoi'i the pivotpin 1 08, so that the dog drops and by the noise of its-tall upon the basegives further "warning;

The operation of the jack will now be briefly set forth. The jack is moved about by inserting the long lever "liftingv handle 757 in the t-rund'ling sockets 102., 103 611 the back of the annex and fastening" it with the pin 104, whereupon the jack is tilted backward upon its truck wheels and pushed along to the place where needed. Because of the organization of the jack, withthe operating mechanism in the base and conse q'uently low cenfter oi gravity, maneuvering is performed-with safety and conveniencd'either otthe wheels passing over a rise without the lateral inclination'carrying the center of mass outside the base 1 support; 'VV henthe jack is tilted forward onto its bottom again,

the disposition of the mass an'd the relatively large ia reajof The 'b'ase,'with }its greater "'h'o'r-i-f toin is the niinirnum'likely to be encountered in'railroad work, for which the jack is more particularly designed.

In jacking, the comparatively small diameter of the head in relationto the-screw andcbearings protects the screw, and avoids frictional resistance and strain from side thinstdue to canted load. Th'e'-head is but slightly wider ian the internal topjbearing ,29, and the. incidence of the l'oad 'is practically confined to theradius betweenum dog acting as a rigid thrust nreinber 7 .zontal dimension parallel with the plane of '0 the circuit of this bearing and the axis of the screw. The nut 4-0 applies the load to the screw at the lower end of the ram and constitutes an efficient center bearing without tending to'bend the screw.- At the bottom the screw is firmly planted upon a wide base afforded by the large gear and the ball thrust bearing beneath it, and the lower extremity is stayed by the'bearing 22. Both in ascending and'descending the head, ram and nut are held againstv rotation by the spline'32, the screw rotating upon its support in the fixed base, and the nut traveling up or down as the case may be.

In order to lift with the jack, the long bar 57 is removed from its fixed position in the trundling sockets and its extremity is placed in the pawl-rocker socket 56. Then the operator, standing behind the annex, works the handle up and down, rotating the lifting shaft 52 and its pinion 51 in a stepby-step manner, thereby turning the lifter gear 50, the common vertical operating shaft $6, the spur pinion a the screw gear 26, and the screw 20, thus causing the nut L0 and the ram and head to rise. in this operation the ratchet 1nember58 of the overrunning clutch revolves with the rest of the assemblage fast on the common shaft 46, the teeth of: the ratchet clicking idly past the pawls 6% of the other member of the clutch connected with the lowering means, which remains stationary. On each upstroke of the sweep handle, during which power is not applied to the lifting mechanism, the effort of the loaded ram to run down the steep-pitch screw is held by the worm plnion of the self-lockinglowering means, the overrunning clutch then acting as a rigid connection, as will be apparent. By virtue of the Vernier action of the clutch heretofore explained, the si'nxback or settlingof the ,ram before the clutch takes hold is reduced or practically eliminated. n the lifting of heavy loads this is an important factor in prolonging'tne life of the apparatus, as the shock in such' cases from a drop commensurate to the length of a ratchet toothis severe; and in addition, of course, labor is saved, because the negative work required of the operator is minimized. The rain and head can be quickly raised to the aching point, by inserting the rotary crank-handle 77 in its socket in the gland 7d and revolving the worm pinion 70 of the lowering means in the proper directlon, thereby turning the worm gear 69 and with it'the member 62 of the overrunning clutch. In this case, the clutch acts as a rigid connection', and the ratchet 58, shaft 46 and the rest of the train leading to the screw 20 are drivenso as to elevatethe ram.1 -VVhen the head reaches, the part to. which lifting power is to lee-applied, the pump handle 57 is operated to actuate the lifting mechanism ofboth the lifting and the lowering mechanisms are presented for operation behind the annex portion of the base.

The load is held, as stated, at any point by the self-locking loweringmeans. In order to lower, the crank-handle 77 is turned in the direction reverse to that for quick raising, thus allowing the worm-gear 69, and through it the overrunning clutch 62, 58, the shaft 46, the pinion 49, the screw gear 26 and the screw, to revolve, and thereby, in turn, permitting the nut to, with the ram and head, to run down.

If the ram is elevated and no load is resting thereon, it will not, as previously stated, slide down by itself on merely letting off on the holding means. Under such condi tion, the operator pushes down on the button 95 on the top of the annex, thereby through the yoke 90 depressing the springsustained clutch member 84: to cause its teeth 87 to engage with the clutch teeth 88 on the part 60. These teeth are so fashioned as to form a positive connection between the lowering means and the shaft as in respect toelfort transmitted from said means to the shaft in the lowering direction. Consequently, by then turning the rotary crankhandle as if for lowering in the regular way, the operator drives through the self-locking lowering means and the common vertical sha t to the screw and compels the nut and rain to descend.

' This completes the description of the preferred embodiment of the invention, other forms and modifications of which-may be devised by the mechanic.

\Vhat we claim as new is:

1. In a high-speed jack, the combination of a base, a ram, a rotary steep-pitch screw member inthe base coacting with the ram, a common vertical operating shaft in the 'base geared at the bottom to said screw member, and two operating mechanisms in the base operative through said common vertical shaft, one being a lifting mechanism geared to the shaft and the other a holding and loweringmechanis'm having an overrun;

ning connection therewith.

2. A high-speed jack, comprising, in combination, a base with a hollow standard and an annex, a hollow ram slidabl'y guided in the standard and bearing'a nut in its lower portion, asteep-pitch screw rotatably supported in the base and extending upward through the nut into the interior of the ram, a common vertical shaft in hearings in the annex of the base geared at the bottom to the screw, a lifting means, and a self-locking lowering means, both on said shaft.

3. A high-speed jack, comprising a base,

aram' having a nut, a steep-pitch screw 1'0- tatably supported in the base and extending through said nut and freely within the ram,

a common operating shaft in the base paral 'lelwith the vertical screw and ram and geared to the lower part of the'screw, alift- 'ing means connected with a lower part of per and lower transverse shafts inthe base,

the lower transverse shaft being geared to the common operating shaftand having an actuatmg rocker for lifting, the upper transverse shaft having rotary. handle operating means, a self-locking gearing operable by the'upper shaft and having its drivenpart coaxial with the common operating shaft,

and an overrunning connectionbetween said driven part and the common shaft.

5. A highspeed jack having an inclosure comprising a base with hollow standard and an annex chamber, a ranr slidable in the standard, a nut in the lower partof the ram, asteep-pitch screw rotatablyo supported at its lower end in the base and extending up ward through the nut and freely within the 7 ram, hearings in the annex chamber of the base, a; vertical main operatingshaft journaled in said bearings, meshing gears on' the lowerportions of the shaft and screw, a; bevel gear onthelower part of said shaft,

a transverse lifting shaft journaled in the annex T chamber and havingan osc llatory operating device and a bevcl'pinion meshing the said gear, atransverse shaft in" the 11p per part of the annex chamber having a rjo; tary operating device, meshing gear elements operated by the last-named shaft,- the driven member of saide-lements-being free on the vertical shaft, and an overrunning connection between said member and the verticalshaft; 6; In a high-speed jack, thecoinbination of a base, a ram with n-ut, a steeppitch screw in the base extending upward through the nut withinjthe ram, vertical Inain operating shaftjin the base geared at the-bottom to the screw, lifting means geared to a lower part-of saidtshaft, afratchet wheel fixedon' the shaft=above the lifting'means, a pawl 7. A high-spec carrier loose on theshaft above the ratchet, aigear element united with the pawlfcarr-ier,

and transverse, crank handleishaft having pini elemen m s g W tlisa e-see element ,d Ja komprising a e a ram, a steep-pitch; screw rotatable on the b e oper ting t eram weet cf ees-e65 meshing gears in the base with handles for operating the, same, thetwo' sets ofgears having members on a common vertical shaft 7 and an overrunning clutch associated with one of them, and connnon meshing gears on the lower parts of the screw and shaft through which-both of. the operating gearings cooperate'with the screw. 7

'8. In a high-speedjack, the combination of, a base, a ram, a steep pitch screw rotatable on the base for operating the ram, a shaft in the base parallel with the screw and ram,

a lifting mechanism, and'a' holding and lowering mechanism with "overrunning connection, both operating on said shaft, and ineshinggears at the'base of the shaft and screw. r H

V 9. In; a high-speed jack, the combination of a base, a ram, a rotary. steep-pitch screw member in; the base coacting with theirain, a gear on the lower part of the screw mema ber, "rotary parts united on a common verti cal axis at oneside of the screw member 1 comprising a pinion meshing with saidgear,

a lifter gear and a member ofan overrunning clutch, another gear and the other I member of the overrunning clutch united with each other and coaxial with said parts,

a lifting device having a pinion meshing with thelifter gear, and a second operating device having a pinion meshing with said a,

other, gear.

10. In a high-speed jack, the combination a of a base, a ram, a rotary steep-pitch screw member in the base coacting with the-ram, 1 00 a gear on the lower part of the screw member, rotar. Y parts united on a common verti cal axis at one sideof the screw member comprising-a'pinionmeshing with said gear,

a lifter gear abovesaid pinion and a mem- 1.05

ber of an overrunning clutch above the lifter gear, another gear and the other member of the overrunning clutch united with each otherabove and coaxial with said parts, and

operating devices cooperative respectively with said lifter gear and said othergear.

11; In a high-speed jack, the combination of abase and standard, a rani slidable therein, a steep-pitch screw operating the ram, a lifting mechanism geared tojthe 1 15 I screw, a lowering mechanism for the screw, arota'ry part through which said lowering mechanism normally coiiperatesl with the" the screw, an overrunning clutchfbetween said lowering mechanism-and said part, and

a device'for coupling the lowering mecha nisni to said part for poslti've lowering.

12.11; a h gh-speed ack, the-combination of a base, a ram,-a steep-pitchscrewimember rotatably' supported in the j base 1 for a ctuat- 1 2 5 i is he rare. an s em e? 0 1 e 9 1 3 10 vertical ax s inthe base geared to saidscr-ew 7 member, a; lifting: mechanism gearedto said as bl e 1a inf- 3 member d a iall t said assembling, aholding. andlowering as tending upward through the nut into the connected with the free member, an overrunning clutch between the free member and the assemblage, and another clutch movable to couple the free member to the assemblage for positive reverse operation.

13. In a high-speed jack, the combination of a base, a ram, a steep-pitch screw member rotatably supported in the base for actuating the ram, a vertical common rotary shaft in the base geared at the bottom to the screw member, a lifter gear and a member of an overrunning clutch fast on said shaft, lifting means coaeting with the lifter gear, a part free on said-shaft including argear and the other member of the overrunning clutch, a lowering device having a pinion meshing with the last mentioned gear, and a vertically movable spring-released clutch for coupling the free member to the common shaft for positive lowering.

14:. In a high-speed a-Ck, the combination of a base, a ram, a steep-pitch screw member rotatably supported in the base for actuating the ram, a vertical rotary shaft in the base geared at the bottom to the screw member, a lifter gear and a member of an overrunning clutch fast on said shaft, lifting means coacting with the lifter gear, a part free on the shaft above saidelements having a gear on its upper portion and the other member of the overrunning clutch on its lower portion, a lowering device having a pinion meshing with the last-mentioned gear, andv a vertically movable clutch at the top of the free part for coupling the same to'the shaft for positive lowering. 7

15. A high-speed jack, comprising a base having a hollow standard and an annex, a hollow ram slidable in the standard and bearing a nut, a steep-pitch screw rotatably supported at the bottom in the base and eX tending upward through the nut into the interior of the ram, a vertical shaft in the annex geared at the bottom to the screw, lifting means in the annex geared to said shaft, holding and lowering means in the annex having a part free on the upper portion of said shaft, an overrunning' clutch between said free part and the shaft, a clutch for coupling the free member with the shaft for positive lowering, and a member in the top of the annex for operating this clutch.

16. A high-speed jack, comprising a base having a hollow standard and an annex, a hollow rain slidable in the standard and bearing a nut, a steep-pitch screw rotatably supported at the bottom in the base and exinterior of the ram, a vertical shaft in the annex geared at the bottom to the screw, lifting means in the annex geared to said shaft, holding and lowering means in the annex having a part free on the upper portion of said shaft, an overrunning clutch between said free part and the shaft, a

spring-raised clutch member slidably engaged with the shaft above the free part, a

yoke slidable in grooves in the upper end of the shaft, and an actuator for depressing the oke.

17. A high-speed jack, havin a base, a ram bearing a nut, a steep-pitc screw in the base, a vertical shaft in the base geared to said screw, raising means in the base geared to said shaft, holding and lowering means having a part free on the upper portion of the shaft, an overrunning connection between said part and the shaft, the portion of the shaft above said part being ribbed with a groove at the base of the ribs, alocking ring slotted to pass the ribs and held in sd groove, and a clutch member slidably engaged with said ribbed portion of the shaft for coupling the free part to the shaft.

18. A high-speed jack comprising, in combination, a base having a hollow standard rising therefrom and containing a rigid bearing in its interior, a hollow ram slidablc in the bearing of the standard and having a small head at its upper end and a nut in its'lower portion, a steep-pitch screw supported rotatably in the base and extending upward through the nut, a lifting mechanism and a holding and lowering mechanism, both mounted in the base and having connection with the lower part of the screw.

19. A high-speed jack comprising, in combination, a base having a hollow standard rising therefron'i and containing a rigid bearing in its interior, a'hollow ram slidable in the bearing of the standard and hav ing a small head at its upper end and a nut in its lower portion, means to keep the ram from turning in the standard, a steeppitch screw supported rotatably in the base and extending upward through the nut, a lifting mechanism and a holding and lowering mechanism, both mounted in the base and having connection with the lower part of thescrew.

20. A high-speed jack comprising a base and standard, and a hood applied thereto forming an annex chamber, a steep-pitch screw and ram in the base and standard, and lifting and lowering mechanisms assembled on a common vertical shaft in said annex chamber with an overrunning connection for the lowering mechanism, and meshing gears at the base of the shaft and screw for both i'i'iechanisms.

21. A high-speed jack, comprising, in combination, a base with a hollow standard and an annex, a hollow ram slidably guided in the standard, steep-pitch screw and nut meoha ism within the base and ram, and operating mechanism comprising a lifting means and a lowering means on a common vertical axis in the annex of the base.

22. A high-speed jack, comprising a base,

a ranrhaving a nut, asteeppitch screw in the baSQCOELCtHIg with the nut, a vertlcal shaft in the base geared to. the screw, a gear on the sh aft,'the"base having atransverse .sin'ooth centering opening, a gland having 1 smooth cylindrical centering portion fitting said opening and means for fastening the gland. in place, and an operating shaft journaled in the gland and bearing a pinion meshing with said gear.

23. In ahlgh-speed ack, the combinatlon with the vertically movable part, steep-pitch screw means for actuating the same, a lifting' means geared to, the screw means, and a holding and lowering means,'of an over running connection between the holding and lowering means and the screw means comprising a ratchet anda pawl-carrier containing a plurality of pawls successively oooperative with the ratchet-teeth. V V 24:. A high-speed ack,compr1s1ng a base having a hollow standardand an annex, a

hollow ram slidable in the standard and having a nut at the bottom, a steep-pitch screw 'rotatably supported in the base to cooperate with said nut, a gear on the lower ,portionof the screw, a vertical shaft in the annex, upper and lowerv bearings and an.

intermediate bearing inrthe, annex for said shaft, a pinion meshlng with the gear on the screw and alifter gear fast on the shaft 7 above the lower bearing, a ratchet fast on the shaft above the intermediate bearing, a "part free on the shaft above the ratchet and including a gear and a pawl-carrier, lifting means cooperative wlth the lifter. gear, and holding and lowering means cooperative with the upper gear.

25. A high-speed jack having a casing comprising a bottom section, a standard section and an annex section applied to the back of thebottom and standard sections, a ram slidably guided in the: standard section.

. and-l having-a nut, a steep-pitch-screw rotatably supported in the bottom section, acommon vertical shaft in the annex section,

ing with both. r

27. A high-speed jack, having, a casing 7 comprisinga bottom section, a standard section, and an annex section, ,a ramslidably guided in the standard sectijonr and having a nut, a steep-pitch screw rotatably sup ported in the bottom. section, and operating mechanism in-the annex Section, the bottom and standard sections having coaxial aliningmeans, and. the annex section interlockcoinprising a bottom section containing a ball-bearing seat, a standard section having an internal slide bearing, concentric alining formations on the meeting portions of said sections,,a ram slidable in said bearing and having a nut, a screw extending upward through the'nut freely into the interior of the ram, a ball-bearing in said seat rotatably supporting'the screw, an annex section applied to both said sections and locking them against relative rotation, and operatingv mechanismin theannex section.

28. A- jack, comprising a base having hollow standardand a rear annex,a'ra1n slidably' guided in the standard, a screw for lifting the ram, and operating meche anisin-in the annex, in'coinbination with a 7 pair of truck wheels normally off the ground at the lower portionjof thef annex, and

handle means on c the annex for tilting the jack: onto its wheelsand trundling it about.

29. In a jack, a base,.a ram, a screw for actuating the ram, and lifting mechanism having an oscillatory handle socket,i n cornbina-tioirwith truck wheels on the base nor= mally off the ground, a trundlingjsocket on the base whereby the jackcan be tilted off its base onto the truck wheels; and a long handle engageable interchangeably with said sockets. i V 7' Y 7 30. A jack having a base with a standard and rear annex, a screw-operated ram in the standard portion of the base, operating mechanism in the annex portion thereofi and truck wheels at the lowerv annex; region-normally clear, of-=t-he ground, to supportthe jack for trundlingwhen tilted rear-ward off its base.

JOHN G. KOPF. ,7 FBANKH. SCHWEBIR,

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