US2825477A

US2825477A - Engine work stand and method of using the same

Info

Publication number: US2825477A
Application number: US378529A
Authority: US
Inventors: Henry M Ross
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-09-04
Filing date: 1953-09-04
Publication date: 1958-03-04
Anticipated expiration: 1975-03-04

Description

March 4, 1958 H. M. Ross I 3 5 ENGINE WORK STAND AND METHOD OE USING THE SAME Filed Sept. 4, 1953 s Shets-Sheet 1 INVENTOR HEN/2V M ROSS I 31%, H3Lla w March 4, 1958 H. M. Ross 2,825,477

ENGINE WORK STAND AND METHOD OF USING THE SAME Filed Sept. 4, 1953 3 Sheets-Sheet 2 "WWI! INVENTOR HENRY M koss TTORNEY March 4, 1958 H. M. ROSS ENGINE WORK STAND AND METHOD OF USING THE SAME Filed Sept. 4, 1953 HYDRAULIC E 58 asszavom.

5/v HAND PUMP 5 Sheets-Sheet 3 INVENTOR HENRY M ROSS ATTORNEY United States Patent ENGINE WORK STAND AND METHOD OF USING THE SAME Henry M. Ross, Alexandria, Va. Application September 4, 1953, Serial No. 378,529

18 Claims. (Cl. 214-152) This invention is a method of and apparatus for transferring an engine, particularly a jet engine, from its supports within an airplane to a movable engine work stand, and performing desired repair service and main tenance operations on said engine, and then replacing the engine in the plane. The invention contemplates the provision of means whereby the engine while on the stand may be supported in a manner to permit run-up tests when desired.

At the present time, considerable ditficulty is experienced in servicing and repairing jet engines used to power airplanes, and no satisfactory jet engine handling equipment is available so far as is known. The known equipment of this kind all includes the use of flexible rigging or cables either supported from an overhead hoist, such as in common use aboard ships, or conventional wheeled cranes with appropriate winch as used in hangars ashore. Neither of these rigs is satisfactory because of the heavy weight of the jet engines to be handled and the tendency of such engines to sway when supported from above on flexible hoist rigging. With these difiiculties in mind, the present invention has for an object the provision of a method and means by which a jet engine while supported within a plane body may be operatively engaged by a pair of rigid arms or finger pins and lifted from the engine supports on the plane without the use of block and tackle or flexible cable rigging of any kind.

Another object of the invention is to provide on a wheeled dolly, an engine work stand of the character described which is designed to supportingly engage the engine and which includes means operable when the dolly is moved clear of the plane to raise and lower the engine as well as to tilt the engine about either a transverse axis or about a longitudinal axis.

Another object of the invention is to provide means for mounting the engine for repairs, service, and maintenance operations on finger pins which are engaged in the hollow supporting t-runnions provided on jet engines, together with means by which the engine may be transferred from said finger pins to bearing members designed and positioned to receive and support said trunnions when it is desired to perform a run-up test or similar tests involving actual operation of the engine while on the stand. At these times the finger pins are removed from the trunnions.

The invention also includes various adjuncts to enable one readily to position the engine as to height or angular position about either the horizontal or longitudinal axis, and to stabilize the engine and its mount in any of said positions.

In some forms of jet-powered planes, the openings into the hollow bores of the engine-carried trunnions are partially obstructed by parts of the plane body when the rear section of the body is removed to expose the engine. The invention provides means for handling these engines by providing longitudinally sectionalized finger pins which are magnetized so that the several complemental F ice parts of the pins are self-adhering but are separable with respect to each other, so that the pin section may be inserted into the trunnion bores sequentially and thus insure the trunnion bores be substantially completely filled by the sectionalized pins assembled therein, whereby to equalize the stresses within the trunnions incident to the support and manipulation of the engine on said pins.

These and other objects of the invention will become apparent from the following specification read in connection with the accompanying drawings, werein there is illustrated a preferred form of the invention. In the drawings,

Fig. l is a perspective view of the engine stand of the present invention;

Fig. 2 is a side elevation of the invention showing in dotted lines the outline of an engine supported on the stand;

Fig. 3 is an end elevation of the stand;

Fig. 4 is a disassembledperspective view of one seetionalized finger pin;

Fig. 5 is a diagrammatic view illustrating the hydraulic system for raising, lowering, and tilting the engine stand; and V Fig. 6 is a fragmental detail of an engine-carried trunnion supported in a conventional pillow block.

In the drawings, wherein like reference numerals are used to designate like parts throughout, the invention is shown as comprising a base 1 composed of

structural members

2 and 3, said structural members being united to form a generally rectangular frame in which the members 2 may conveniently be designated as end pieces and the members 3 as side pieces. The base 1 is shown as a skeleton frame without deck or flooring, but if desired a deck or flooring may be employed.

The base 1 furnishes support for spaced, opposed, upright members 4 shown supported upon the side pieces 3. Each of the uprights 4 comprises generally upwardly inclined

structural members

5, 5 secured together at their upper ends in any convenient manner such as by welding. The upright members 4 are mounted in spaced, opposed relation at opposite sides of the base 1, and each of the upright members includes a vertically adjustable member 6 having a lower, stationary portion 7 and an upper, relatively movable section 8. The

sections

7 and 8 are, as shown, telescopically engaged, and as will be hereinafter described, the overall length of the members 6 may be hydraulically controlled.

The upper terminal portions of the sections 8 include arcuate supporting portions 9, said portions 9 having their axes disposed generally transversely of the base 1. Each arcuate member 9 is provided with trunnion members 10 which support for pivotal movement about an axis transverse to the axis of the arcuate mem-' bers 9, a slide bearing 11. The slide bearings 11 are designed to provide support for an engine supporting yoke 12 in a manner to provide for pivotal. movement of said yoke about a transverse, horizontal axis as well as pivotally about axes passing through the trunnions 10 The engine supporting yoke 12 is provided with terminal portions 13 which are fitted within the slide bearing members 11 and are designed to have sliding and rotary;

cylinder 14 mounted upon each section 8 for pivotal movement between a pair of spaced brackets 15 secured to the

respective sections

8, 8. Each of the cylinders 14 is provided with a piston 16 connected to the yoke member 12 through bracket arms 17 secured thereto. The

"ma'nnefiin -which"tl'ie"hydraulic cylinders 14 are controlled will bemore clearly described hereinafter;

The yoke member 12 is designed to support an engine to be serviced or tested, and to this end is provided with at' pair of supportingbrackets 1S ,whicli'project fromfthc plane of the yoke member. in 'a di'recti on opposite to the bracket-

arms

17, 17. "The brackets '13 in turn support within the slots 'areibolt' members21'; this arrangement "permitting the plates 1910 be adjusted towards and away from'theplane of the yoke member 12 for adjustment purposes, vas will be more particularly referred to herein'after. The platesyl9 are eachprovided with'anupset free terminal po'rtion'i22 on whichis mounted'a finger pin'carrying member123; as is more clearly apparent frorri'Fig; 4. The finger pin carrying members 23. are each provided with a longitudinal groove 2 within which the upset terminal portion 22 eithe plates 19 are received, and inorder to provide for the transverse ad-f justment'ofthe pin. carrying member 23 with respect to the plates 19, the said plates are slotted as at 25am a bolt 26 passes slidinglythrough the slot and into threaded engagement with a threaded hole 27 disposed within'the groove 24. 'By this arrangement; in carrying members 23 maybe adjusted towards and away from each other to vary the.distance;therebetween to facilitate engagement and disengagement of the finger pinswith respect to the bores oftthe hollowtengine'carried tr'unnions', as will later be described. Each'of the pint carrying members. 23 is provided with sectionalized finger pins 28 (see Fig.4). .lEach ofthejpins 28 is,

as shown, divided longitudinally on a plane passing 4 through its aXis to provide at least one separable-pin sectioni29fwhich.is? complementalto 'a pin section 34 rigidwith the pint carrying member 23. The pin sectionst29 and 30. whenzassembled form a substantially cylindricalifinger pin which'rnay be inserted within'the hollow bore of anengine carriedtrunnion'as will later appear For convenience in-manipulating the pin sec tions.29 and 30, they are preferably magnetized so as torender the cornplemental sections self-adhering and at the same time permit ready: separation for sequential insertion of the pin sections within-the-bores of the engine carried trunnions, as will later 7 be "described.

,The upright members 4;are each provided with means to support a laterally adjustat iiev plate As shown,

the upright members carry upwardly pro'jectingboits-SZ which pass through a slot 33 in'the plate 33;, the'slots 33 and bolts 32 being positionedsotthat the platesfil' may be shifted laterally towards .and away from each other to vary the spacing therebetween. Each offthe plates 31' carries a pillow block or bearing'34, the two bearingsbeing aligned'horizontally to define an axisiof support for'an engine when the-latteris :to be subjected V V to a runeup test vtor similar tests winvolving .factual'oporation of theengine The pillowblocksior'bearings 34 maysincludeta, stationary bottom bearing 'section 3 there is provided 'a turn buckle strut 38 pivotallycon nected intone end to a' pair ofspaced ears or lugs .39

carried: by' the inside face 4i? of-the adjacent'endimenr' ber; zfan'di at its-opposite. end to a pair or spacedflugs;

onhrackets, not shown, carried by theyoke 12; Thus, whenfde'Si'rdglhk stint" 33 may be adjusted to a proper;

length, and connected as described between the end membeFZ'and'the'yOke 12to stabilize the yoke iagainstturning, in an angular position of adjustment in which it may have been placed.

An adjustable rear supporti being pivotally 'connectedl'at its lower end to the same end member 2 by spaced lugs 42 and carrying at its upperendayoke shaped support ,43 having engine engaging rollers 44 at the upper terminal portions of the yoke arms.

45 operatively connected to the lower portion 'of the column 41 by a properly valved conduit 46.

A further stabilizing strut 47 is'provided, and the same i is pivotally connected to the yoke membersubstantially at its ce'nter. ThiSiiStIlltiS of theturnbuckle-type similar in' 8l1irSPCtS to ithati'shown at -33 andt isv de: 7 signed and arranged'tobeconnected .toihe engine when the latter is mounted'ion' the pins t2 8, .for." the purpose of' stabilizingfthe engine within the yoke. In this re 'spect, itimight be. noted that the engine is normally '25 provided with a pair ofVears -iS towhich astabilizingt element is attached whenathe enginetis rnountedina J plane, and {these'same-ears 48 are employedto.reeeivejthe upperjeiidjof'the strut'iflvvhen the engine is rernoved frornthe planefandiis'support ed on the pinslzZS; as'pre" l 'viously described.

'As previously stated,

upright members '4. and for pivotallymoving the yoke member 12aa'ng ularly within its s11pporting'bearings; 11, V

and .to this endlthe sections 7, Tot the upright member 7 4 are innthe 'form of hydraulic, cylinders t and receive pistonimembers, not "shown; carried by the lower ends of the sections 8 8 V Manually I operable pump me'ans 49 ar'evpr-ov'idedtforsupplying hydraulic fluid unde'r Pia-5 x sure for the;hydraulic-cylinders7, 7-and-the hydraulic" cylinders '14; 14-. Any convenient 'fiuid reservoirsuch n a550 may be provided on the base 1, and;the;puinp -,49

may draw fiuid therefrom through a line" .51 and 'dis- 1 charge the Isa-me tnn'der pressure through a conduit 52'. 4 The conduit 52 may deliver fluid underpressure-jto' a controlgvalve 53 from whence said fluid 'may beaselectively delivered-tto the cylinders '7','7 throu gh'lines;i54 t and tothe-I cylinders 14-, 14 through lines:5S.' Th'egopl V eratingfluid tdeliveredgto the cylinders;.14. -may conveniently passt thrQtigh the trunnions byAVhiCh thewcyLinders are pivotallytsupported from the brackets 15.-The.va1ve 53 is arranged: selectively to;deliver fiuid eitherin unison or .individnallyxto the

acylindersf

7, 7 in ,order-toiraise and lower; theg-yokegor'tto tilt the yokeuabout. a longis' 55 t-irdinal'axis t-of the engine, by movingpne.ofzthekSect dons-:8; 8to-a1-liigherxelevation.thanztheiother,i"fer=:=a purpose.-to:be;hereinafter described-- Ehe vaive Eileentrols.jointly-flow:.otfluidjto the c ylindersil' '14. -T'ne dischargei'ofvfluidefrom thefcylinders T14,ff141 tand from a the,cylindersfl, 7,imay;be;controlledi'byg suitableexhaust V valvesgifi and forconvenience; th e"valves:" 53 land. 55 l t mayrbeimountedmpon a C(intfOLbQaIdiSiLWhiChifi-filtfi is mounted upon-one of the upright rn embers -4. "In 'Eig. 5;;haye; :shown' diagrammatically 'zonel formzofghy dra'nlicq system which may beH-convenientiy employed 7 7 o e c ive y rs insflhef 'yiinders f 7 1 and, 14 an m r an 9.

as shown, eachiof; the lines beyond the valve 53 includes a checkvalv e 58.

For conveniencein'movingtthe engine-st vide'casters j-therffl e. and to this eridfcastersfi in Llinks "60"which 'in ;turu f-are pivotally: iconnece r g column for anlengine V mounted on the stand is provided atttl, said column Preferably, the rear engine supporting 7 column 41 is adjustable, and to this end is made in the forrnxof a conventional hydraulic jack, fluid-underprest sure being provided therefor by a hand operated pumpv V 'l preferto' provide' hydraulic f means for raising and lowering the sections 3-, deft-he a an ofi t ei ee ent.inventiontfrom'placeitdplace, it isdesirable pro;

provided. Ihefcastei's 59 arehshown mounted-onswin g just described is for the purpose of selectively placing the casters into or out of operative relation with respect to the frame 1 by swinging the links 60 about their pivots 63. It will be understood that when the arms 64 carried by the links 60 are moved to their lower position as shown in Fig. 1, the casters are moved into operative position and the base 1 may then be readily moved from place to place, whereas when the arms 64 are moved to an elevated position, not shown, the casters are swung out of operative position with the result that the rigid feet 62 engage the surface on which the base is supported and in efiect, anchor the base against movement.

The stand of the present invention is designed particularly for removing jet engines from airplanes. Jet engines of the type to be handled by the present apparatus are provided with laterally projecting hollow trunnions 65 or bosses which, as shown in Fig. 6 are supported in pillow blocks carried by the plane structure 66. The pillow blocks generally includes a stationary base member 67 which may be secured by welding or any other suitable means to the plane structure 66. The base member 67 is provided with a segmental bearing surface 68, and a complemental bearing section 69 is provided, the latter being pivotally carried by the movable section of the pillow block 70. The

sections

67 and 70 are secured in closed relation about the trunnion 65 by means of a pivoted locking bolt 71 in a well known manner. In some instances, the opening 72 to the hollow bore of the trunnion 65 is at least partially obstructed by an overhanging part of the plane structure as shown at 73. The present invention is designed particularly for interiorly engaging the hollow trunnions 65 by a pair of finger pins while the trunnions are still housed within the pillow blocks and removing the engine from the plane supported on said finger pins which are entered within said hollow trunnions. The manner in which the invention is employed is as follows:

Fig. 2 shows in dotted lines the section of a plane, the rear portion of which has been removed to expose the rear portion of the jet engine which is to be removed from the plane for service. The base 1, with the casters operatively engaging the floor surface, is rolled to a position beneath the plane, with the yoke 12 disposed in a substantially vertical plane and straddling the engine from beneath and with the pin carrying members 23 projecting forwardly of the upright members as shown in Fig. 2. The vertically adjustable sections 8 of the upright members 4 are then adjusted hydraulically to an elevation such that the axis through the bearings 11, 11 is substantially coincident with the center of gravity of the engine. A pair of pin carriers 23 is then selected, having finger pins 28 dimensioned to correspond to the hollow bores of the trunnions. 65. It should be noted that there is some variations in the size of these bores between planes of difierent model, and it is therefore de sirable to have on hand, several pin carriers 23 of sizes corresponding to the sizes encountered in servicing planes of different type so that a pin carrier having a pin of proper dimension may be mounted on the slide plates 19. It should also be noted that in planes of different type, there is a variation in the distance between the center of gravity of the engine and the location of the hollow supporting trunnions carried by the engines. This makes it desirable to have a selection of slide plates 19 of different dimensions'corresponding to the requirements of the diiferent engines. Having selected a pair of slide plates 19 of proper dimension for the engine to be serviced, these plates are mounted on the brackets 18 in a position of adjustment such that the pins 23 carried by the pin carriers 23 are in substantially horizontal alignment with the trunnions 65. As previously mentioned, the bores 72 of the trunnions 65 are sometimes obstructed by an overhanging part of the plane, and with this in mind, the section 29 of the sectionalized pin 28 is detached from the body of the pin and inserted through the unobstructed portion of the trunnion opening 72. This section of the pin is then moved angularly within the bore of the trunnion until it occupies that portion of the bore which is obstructed by the overhanging part of the plane body. It will be recalled that the pin sections are magnetized so that the inserted section of the pin will, by its magnetism, cling to the inner wall of the trunnion bore and maintain its position of adjustment. This position is generally one in which the flat longitudinal face of the section is in a substantially vertical plane. With the pin sections 28 positioned as described, the pin carrying members 23 are now adjusted laterally and inwardly of the plates 19 until the rigid pin sections 30 carried thereby are fully received within the hollow bores of the trunnions. The pin carrying members 23 are then secured in such position by the adjustment bolt 26.

In the event the plane carrying the engine to be serviced does not occupy a truly horizontal position with the result that the trunnions on opposite sides of the engine do not lie in the same horizontal plane, the pin 28 on the high side of the engine should be engaged with its trunnion first, as described above. Then the hydraulic cylinder 7 on the low side of the engine should be actuated to permit lowering of that side of the yoke member until the pin carrier 23 on the low side of the engine is in alignment with the low trunnion of the engine. The pin 28 carried by the low pin carrier is then engaged with the low engine trunnion, as above described. This tilting of the engine yoke about the longitudinal axis of the engine as just described is permissible due to the mounting of the yoke bearings 11 for pivotal movement about axes parallel to the axis of the engine, and the slide bearing provisions incorporated in the bearings 11.

With the finger pins 28 properly engaged within the hollow bores of the trunnions 65 as above described, the

hydraulic cylinders

7, 7 are energized to elevate the yoke slightly to take the weight of the engine off its plane supports. The rear engine supporting column 41 is then brought into supporting relation with the tail section of the engine as shown in Fig. 2, after which the pillow blocks which enclose the engine carried trunnions are opened to release the trunnions. The lower engine mount which is employed within the plane for securing the engine to the mount rod is then released from the engine lugs 43 and the engine mounted on the finger pins is then carefully moved clear of the plane by rolling the frame 1 aft. When the engine is clear of the plane, the stabilizing turn buckle strut 47 carried by the yoke 12 is attached at its upper end to the lower engine mount including the lugs 48. With the engine thus supported on the stand, it may be raised or lowered by actuating the

cylinders

7, 7, it may be turned about a horizontal axis passing through the bearings 11 by energizing the cylinders 14, or it may be tilted about a longitudinal axis by differentially operating the

cylinders

7, 7. It should be noted that after the turn buckle 47 is connected between the yoke 12 and the lower engine mount 48, the rear engine supporting column 41 may be lowered to an inoperative position.

As previously stated, the invention contemplates providing means for supporting the engine on the stand for run-up tests and similar tests requiring actual operation of the engine. The means for thus supporting the engine on the stand are the pillow block bearings 34. Thus, when it is desired to perform a run-up or similar test on the engine, the

cylinders

7, 7 are actuated until an appropriate index mark such as 74 carried by the

members

8, 8 is in registration with the top of the hydraulic cylinders 7 or some other indicating portion of the stationary structure, which will indicate that the engine is in a proper degree of elevation to be transferred to the pillow blocks 34. With the engine positioned at such correct height, the pillow blocks 34 are opened and the engine supporting yoke 12 tilted by appropriate action of the cylinders 14 to move the yoke in a clockwise t, 4. The engine work asses? f i 1', and 'ito auje x'tent to-bring a'nd' thelfin-ger pins '28 are Withdrawn from fihe'hollow l-trunnions. The engine is'now supported byfthe trunnions exteriorly'bythe pillow blocks-34 within Whieh: they are enclosed. The engine may then be leveled by'properly shlftmg the yoke angula'rly in a counterclockwise"'direc-,

tion. It will berecalled that the yoke 12 is stillattached i toi the engine by'meansof the stabilizing; turn buckle 47,

' so thafi-shiftingof the yoke in the manner described will turn the e'ngine about an axis through the pillow blocks 34. f-When the engine has'been moved to 'a' horizontal position,- the yoke may be stabilized by attaching to it 'the free end of the turn buckle strut 38. Theengine may now be operatedtin safety, since it is securely sup- Ported"1'i1" h :PllloW blocks. '34 and is tstabilized'with re-' spect to theyokeiby the turnbuckle strut 47' and thefyoke' i'niturn is stabilized by the turngbucklejstrut 33. "The eng ne may, when 'desiredgbe transferred to the finger p ns 28 again bya reverse procedure and maybe restored to the' supporting pillow blocks intheplane "by moving the base l with the engine supported thereon into opera tive relation with the'open pillow blocks 67 oftheengine and the finger pins then withdrawn and'the' stand removed." At any time during the testing or servicing of'the en:

' Cally adhered thereto; L V V lthereof'gis'par tly obstructed an'd V a wane-natal; separable; magnetized, semi cylindrical pin seet-ion 'magneti- 1 The appa atu described in am 1 .whereiin said iparr finger pinsis mounted respec'tively eii 'slide plates carried by theenginefsuppor'ting tnembeh sa id plates and engine supporting member being-;relat-ively adjustable to vary the di stance" between the pivotal a'iris of the engine s upportin'g member and the aiiis defined byfthe-finger pins. .7 a t t 6. The apparatus -d escribed inclain;l FS Wherein -the finger pins areadjustably mouhted on said slide plates respectiyely, wherebyte-move ;the' pi-nsitowards and item leach other. i

'7. The" apparatus described in claimlfl whereid'the pivotalmountingflmeansifo f' t e; engine supporting member includes a1 b aang'member onleach of said upright members 12nd respectively supporting opposite ends'of' .the engine supporting member anddefininga-generally horiagntal pivotal axis" therefor, and a-trunnion pivotally mounting each bearing member-for movementabout 7' a an axis, transverse .to'thepivotali axis of-said enginsupupright .members e achiinclude "means for varying "the; 7 height thereof'jand of Ihebearing members for the engine supporting member, andi;control;means "for--'se1 ec tively Varyingtheheight. of:saiduprightmembers; jointly:

-"gine,-the casters 59- maylbem oved "out of engagement with, the front or other, supporting surface and the rigi'd feet 62 brought into supporting engagement with such surface. t From the foregoing it airplanes, repairing and servicing them, and subjecting them to "fru n-up tests without the use of any "flexible support rigging, and in amanner such that the engine a is .at all times securely supported against'undesirablemovements such as are inherent in engine handling equipment characterized by the: use of flexible rigging or cables for supporting the engine either during transport or operation. a V 1 w is apparent" that I have provided" a method of and apparatus for removing jet engines from" :porting member.

j '8." The apparatus described in claim 7""wh'erein fthe orindividually, whereby the pivotal axis'of; fthe; engine 7 V V supporting member mayberaised, lowered,for t lted as V desiredj l t a 9bThe apparatusflgdescribediin {whereinjat "leastone-of said bearings'isja'eombinedrotarygand sllde a,

' bearing to permit endwise movement :of {the .:engi ne"sup- I l1aveillustrated in the accompanying'drawings a desired form of my invention, but itiis to be understood that minor changes can be made in the 'size and proportion of parts there'shown without departing from :the

spirit of' my inventiomwhich is. more clearly defined in t the appended claims. 3 a t r engine work 'standicbmprilsing a base niember, '7 plural'upright members mounted in'opposed, spaced relationon said. base member, an engine supporting member,

' 7 means pivotally mountingthe same at opposite ends on V I 'said; upright membersrespective1y,-and a'p air of engine v engaging; finger pins carried"by the engine tsupporting fromf a'ndf generally parallel tothe pivotal axis of 'said enginet supporting' member; and means for relatively adjusting the pins and said "engine supporting member to vary the distance between said pins, 7

The apparatus deseribed'in claimd wherein an adr ju stable 'strutl is mounted on said'base and carries aryoke shaped" engine, engagingimember" and is adapted, to be are provided for moving the eng'ine' lsl pporting member member and adapted to engage Wlthln hollow open ended wlth Said fing p trunnions'fcarried by theeng'ine,fthe pins being disposed in spaced,;oppos'ed relation and aligned onan axis spaced 7 adjustable strut is provided in, which the engine trunnions a porting member therein, andyvhfl mian'j 'film t q l d en in aPPQ t 'm fortilting the pivotal axis of. 's

her about an axis generall transverse tosaid' pivota-l axis.

l0. The apparatus edescribedin claim 1 whereinsaid engine supporting member is generally yoke shap and is mounted upon said upright" members with the bridge portiontof -the yoke depending between said members tdunderlie an engine supported thereon; L

11. The apparatus jdelscribedini claim lblwhereinian said yoke,whenldesired., V v p 12. The apparatus desc bd lll claim Jl 'wherem' means angularlyabout said pivotal mountin'g.

13. The apparatus jdescribed infclaiml l2gwherein-a pair of spaced; open? top bearing membersiarejadjustably mounted on said base beneath saidjfinger pins-.andadapted V i 7 ally vertical alignment 7 a a generally horizontal n n s n' said 5 aiPQSi Q 7 re i'dis'posedi within said gfthe enginelsupportmg Z to be disposed respectively in gene'r axis whereby an 'engine supporte'd: bysaid I engine supporting me her may bemovedto.

open topcbearing members by rnea'nsabout-itspivotalaxis;

open top bearing membe closure means, :for retaining therein forrun:up tests.

detachably, connected tofahf engine supported on-fsaiq" engine supporting member, to stabilize the same;

"f 3.;']he engine wo'rk stand describe-din 6131111 1 wherein V V at; least one-of said pinsjis contoured to provide anon- V circular cross sectional area perpendicular to the thereof substantially corresponding toj the cross sectional area 'off, theeaccessible opentend of thelcorrespondingrhel "low ng n r n i na V l j" i' 5 V stand described-in. claim 1 wherein at'leastionerof said: pins f-is substantially semiecylindiic'al in'forr'n'to permit theentrance'thereof into a' 'correspbnd- 7 in'g' hollow 'engine trunnioneven thbugh-the-'open end' v may' be' detache d forsuc 75,

s'aidhollowtrunnionsi ,1 a 7 mi h a said, ba l'ai slg siad pted to be detachably connected to Qsai dyOke-to; stab lize e 7' J f I r .Th' 1a aratus descnbedmclaunld w herein sa1 14 6 PP rs;are:proyided gw thbeanng f ienginercarried 'trunnions 1 16. In an engine work stand, an engine supporting member, spaced, aligned finger pins carried by the engine supporting member and defining a generally horizontal axis through the pins, each of said pins being sectionalized longitudinally to provide at least one pin section separable from the main body of the respective pins, said pins and sections thereof being magnetized to render them self-adhering.

17. The method of removing an engine from a plane within which it is supported on engine-carried, openended hollow trunnions and wherein the open ends of said trunnions are partially obstructed, comprising positioning an engine stand beneath the engine, aligning a pair of semi-cylindrical pins carried by said engine stand with the unobstructed portions of the open ends of the bores of the respective trunnions, inserting a magnetized semicylindrical pin section into each bore through the unobstructed portions thereof and moving said pin sections angularly about the axes of the respective bores into the obstructed portions thereof, inserting said first-mentioned semicylindrical pins within the unobstructed portions of said bores, releasing the supporting connections of the engine from the plane, and then moving the stand with the engine supported on said stand rearwardly away from the plane.

18. The method of removing an engine from a plane within which it is supported on engine carried hollow trunnions comprising positioning an engine stand beneath the engine, supporting a pair of axially aligned pins on the stand for rotation about an axis substantially parallel to but spaced from the axis of said pin, aligning said pins with the bores of the respective trunnions, inserting said pins within said bores, releasing the supporting connections of the engine from the plane, moving the stand with the engine supported on said pins away from the plane, and rotating the engine about said axis of rotation to move said engine carried trunnions downwardly into supporting engagement with open top bearings provided therefor on said stand.

References Cited in the file of this patent UNITED STATES PATENTS 737,323 Blakesley Aug. 25, 1903 1,063,816 McLaughlin June 3, 1913 1,363,020 Shewalter Dec. 21, 1920 1,380,573 Manley June 7, 1921 1,580,358 Wright Apr. 13, 1926 1,600,835 Manley Sept. 21, 1926 1,648,474 Coleman Nov. 8, 1927 1,804,419 Hutchens May 12, 1931 1,805,320 Trimble May 12, 1931 1,812,585 Collins June 30, 1931 1,889,750 Kaplan Dec. 6, 1932 2,329,860 Staley Sept. 21, 1943 2,446,515 Weingart Aug. 3, 1948 2,479,623 Johnson Aug. 23, 1949 2,541,160 Heim Feb. 13, 1951 2,620,930 Mullgardt Dec. 9, 1952 2,703,252 Blackwell Mar. 1, 1955