US1439334A - Engine-overhauling installation - Google Patents

Description

sksHEETs-SLHEU 1.

'Dec'. 19,1922.V

J. J; SCHWARZ. ENGINE OVERHAULING INSTALLATION. ,FILED MAR.25|1920.

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Dec. 19, 1922.

A TTORNEY.

Dec. 19, 1922.

1.1. SCHWARZ.

ENGINE OVERHAULING INSTALLATION.

,FILED MAL 25|1920.

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INVENTOR. www Jef/WA RZ. BY Mm ATTORNEY.

Patented Dec. 19, liQZZ.

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JUHNJ. SCHTARZ, OF REAYWOOD, NEW' JERSEY, ASSGNOR TOHENRY'1\EETZ, OF

` i A MAYVOOD, NRSV JERSEY. i l

vnireIivn-ovennenLinernsrniiizarioit v, Eipplication filed March 25, 1920. Serial No. 368,712.

i o aZfw/iomfi may] concern.; f lle known that l, Joni): (l. @ici-riverine citizen ofi the United. States, residing Lat ivlaywood, in the county of Bergen and State; o New Jersey, have invented certain new and-useful lmprovenients in Engine-Overhaiiling lnstallations,k of which the `following is specification.

This invention relates to lmachines vfor overhauling engines, and with regard to certain more specific features, the invention has especial utility in Vconnection`with T type Ford engines.

@ne oi the objects ot' the invention :is to provide an installa-tion by the use of `which all of the various operations in the overhauling of an` engine can be accomplished i with ease and dispatch.

' Another: object is to provide an installation oli the above typeby the use of which disassembly, repair, reassembly and testing or' the engine can be performedwith a. minimiun ot' trouble in setting up the enginefor said operations. *i

' 5inother object ris to provide apparatus of the general type set forth, simpleV and com? pactl in construction which will permit with a minimum oi? effort all orfanycombination of the `following steps: disassembly of the engine, reaming of the crank shaft bearings, burning in ot the crank shaft and, other parts, reassemblingjoi the engine, running in and testing of the engine. i,

Another ob'ect is to provide in apparatus oi" the type set forth, simple, easily set, and vyet` effective means forsecurin'g the engine in place upon the machine.v

Other objects will be in part obvious, iii part pointed out hereinafter. I Y

The invention accordingly consists in the features of construction, combinations of elements and arrangement ot parts which will be pointed out hereinafter, and the scope ol the application oi which will be pointed out in the following claims. f

Referring now to the accompanying draw ings in which is `shown one'oi various possible embodiinents of the several features ot' this invention, 1 is a sectional side view of my machine., a Ford engine being shown in dotted linesin'place thereon.

' Fig. 2 is an end view oi my installation. Fig. 3 is a side elevation partly in section 'of the engine carriage showing a Ford engine vcasting in place thereon as in Figjl.

Figa! is a detail view or" the burning iii connection, the driving linlr beingr shown broken. i' f running in .Fig 6 is reamingconnection. n i' Similar reference characters refer to simisubst-a ntially 'a view similar: to Fig. 4 oiitlie connect-ion, `and the dra-wings.

Referring now to the drawings, l have ar parts throughout the different views of show-n a machine for overhauling engines comprising a bed 1,.mountedjupon legs 2. Upon" thebed there is proi'f'ided a power shaft 33 mounted in bearings 4, 5, which are located iespectiveli7 ywithin standards 6 and 7, rising `trom the bed 1. The delivery end of the power shatt is non-circular as at 69 for effecting a convenient driving connection as will appear below. ,The standards 6 and 7 also' preferably carry near their lower ends the bearings 8 for the clutch shaft 10 to which power 'for operating upon the engine to be overhauled is transmitted, preferably from an electric motor 11, through 4a belt l2 or the equivalent, which drives by wayot example the drum 13 ot a clutchlel. The power is delivered from clutch shaft "l0 to power shaft through a pairl of mesh'- ing gears' 15, 16, .the former keyed to the shaft 10, and the latterr to the shaft Bgvgear 15` being by preference of smallerdia-meter than gear 16 tor effect torquemultiplication. j l The clutch taken perse is of well known construct-ion and .not my invention.y It may brieiiy be noted that ythe saine by preference comprises a friction band 9 within the inner periphery ofthe drum 13 and a lever 17 fulcrumed at one end 18 within the drum and delivering pressure intermediate its ends 'through a linlr 1 9 to friction band 9 for tightening the saine. A cone 20 is shiftable upon the clutch shaft 10 by means oi' a lever 22 having a part .tittingin a groove 21 in cone 20, the free end of leve-r 17 having a portion resting upon said cone. lt will be understood that the tightening of the clutch is effected by throwing lever 22' whereby the cone is shifted to its extreme lett,- the cone a view vsimilar to `Fig. et ofthe ignated by the line ifi- A.

` ment with power shaft 3,'said carriage be- `sides oi' the cylinders oil the engine to ing mounted upon the bed l for adjustment about its said axis. For this purposel preferably provide upon the bed 1 a circular seat 25 preferably secured to the standard 7 by bolts, one ot which appears at 60, as best.` shown in Fig. l. An arcuate seat 2e is provided near the end ot the machine opposite the power shaft, said seat being coaxial With the seat 25. The carriage C by preference comprises a pair of coaxial annular end members or rings 28 and 29 of different diameters, formed rigid with a pair of connecting.- cross `beams 30 and 3l, the latter having the vgreater part of its length parallel to the axis A-- The cross beams *are preferably channel shaped; the channels of thebeams 30 and 31 embracino' lugs l6l, cast integrally with the annular end members 28 and r29. Any suitable means is employed for securing the crossbeams to the annular members, such as bolts 70.` The ring 29 is preferably of considerably larger diameter than the ring 28, andrests upon the seat 24:. ln putting together .my assembling machine,-tlie engine carriage C is applied by slipping end member 28r over seat 25, the other end member seating upon seat 27. Any suitable stop, as shown for instance at 62, serves to prevent longitudinal displacement of the carriage. lt will be apparent lthat the carriage may readily be adjusted aboutits longitudinal axis A--A by raising or depressing one oic the cross beams, thus rotating the carriage about its seat 25, and Within its seat 2st. The manner et supporting the carriage above described is the ypreferred embodiment, and it will be-understood that different forms of mountingrmay be employed.

`Means is provided tor securing the engine to be koverhauled upon the carriage C, 'this means being preferably such as to permit ready access to all parts oi the engine ior inspection, disassembly, repair, reassembly, adjustment and tbe'lilre. By preference this means comprises an engine rest 26 rigidly secured, or if desired, 'formed as an integral part with the cross beam 3l of the carriage C.- Therest is provided with a plurality` of troughs 27 Within which. are disposed the be repaired. y s

Any appropriate means is provided tor rigidly securing the engine to saidengine rest, this means by preference extending in a plane transverse voi? the engine and inr'termediate the top and bottom the cylin dotted lines on Figs; l and 3, the Ford engine has four cylinders, f 32 and 33 as an integral part- With the upper cast in two pairs halt 63 of the cranlrcase, there being a space 34 between ythe cylinder pairs. When my apparatus is used ior operating upon an engine ot this general type, l employ a bolt 35, having a head 36, said bolt being inserted to extend upwardly as shown in lig.

l3, throughr the cross `beam 3l. cent-rally throughsaid rest 26 and perpernilieularly thereabove through the space 34e in vthe engine block. nut is then threaded upon the `free end of the bolt againstthe fiat surface 38 formed particularly on Ford engines, thereby clamping the engine frigidly and accurately in position.

ltwvillbe noted that the sidesl o the troughs 27in the rest 26 will limit the engine block against rotation. about tbe bolt 35 and the nut 557 Will prevent they engine from undesired displacement along the boltl or removal therefrom, so that the sini bolt and nut serve to firmly and accurately retain the entire engine in` position upon the carriage, Without in the least vinterfering with ready access to allparts oi the engine to be Worked upon. lt will be runderstood that other meansniay be provided or mounting the engine in position` but I prefer to employ the speciiic nieane` shown and described.l

As indicated in Figs. l and 3, the i ts are preferably so proportioned that when the engine is mounted in position thereon. the axis of the crank shaft `will extend along or coincide with the axis r et the carriage for a purpose Which will appear fully below.- y y y In the useo'f my apparatus the engine to be overhauled Will be bodilylaid upon the engine, rest 26, with the sides ot the cylinders fitting into the troughs 27, and the bolt 35 and nut 37 will be applied to iirmly The carriage C may be firmly `secured in any desired position about its axis by means of a friction strap 39. The strap preferably encircles the end ring 29 and is secured the strap for securing firm frictional clamping engagement with the carriage. This lock by preference comprises a lever 40 having a fulcrum 42 lodged within an eye 4Q' in one end of the strap, the opposite end ot' the strap 39encircling a stud 4l intermediate the ends of the lever 40, the free end of said lever serving as an operating handle. To tighten the strap the lever 40 is merely depressed and the strap end 44 will thereby be drawn in 'circumferential direction to perform the securing function. By raising the end of the lever 40 the strap is rendered ineffective, opened or' unlocked.

After the engine has been disassembled. as above described, the carriage is clamped `in'such position as to dispose the engine block in inverted position. The main crank shaft bearings arek now replaced and are reamed by power applied from the vpower shaft 3.

By preference the assembly sh'own'in detail in F ig. 6 is used for operating the reaming tool 48 from the power shaft 3. This assembly comprises an adapter 4G, having anon-circular opening snugly embracing the end 69 of the aower shaft 3, the adapter including a cy indrical shell bifurcated by longitudinal yslots as at 47. 14. connecting link 45 lits loosely into the adapter shell, and has a pair of pins 49 projecting into said slots, thus constituting a universal: con nection. The reaming tool 48 which is of known construction is attached by a second universal driving connection 52 to the free end of the link 45. The link is threaded at 50 for a substantial part of its length, and a nut 5l cooperates with said threaded portion,

The detailed process of carrying out the reamingoperation consists in first applying the assembly of F ig. 6 in place between the power shaft and the engine casting in a manner which is obvious. Power is then applied by starting the electrical motor ll and tightening the clutch 14 by shifting the clutch lever 22, wherebythe power shaft is driven. The nut 51 is then 'grasped by a pair of tongs or the like and held against rotation, whereby the'link 45 will feed forwardly by reason of the threaded connection and the reamer will simultaneously work its way through the three bearings for the well known purpose. K

As shown in the drawings the engine is mounted at a substantial distance from the power shaft 8, so. that the connecting link 45 for transmitting power to the reamei must be of substantial length. Should the crank shaft axis be' inaccurately aligned with the continuation of the power shaft, the relatively long link by reasonof the universali connections will nevertheless cause the reamer to feed properly along the crankshaft axis.

rPhe reaming operation having been conipleted, the reaming connection is removed, the crankshaft is inserted in place within its bearings, and said bearings are then tightened to firmly `grip the crankshaft.

The crankshaft is now ready for the burnf ing in process, that is, the process of rotat ing the crankshaft under power for heating the bearings and rendering them plastic to cause them to assume'the proper dimensions required in use, this process being old and well known.

For transmitting the power for burning in the assembly shown in` Fig, 4 is employed. An adapter 64 is employed similar to adapter 46 heretofore described but materially shorter. A driving link 53 has a pair of transverse pins 54 fitting in the slots 47 of the adapter 64.

`The opposite end of link 58 has a pair of pins 57 preferably at right angles to pins 54, and fitting into a pair of slots 56 in a sleeve 55. This sleeve is mounted upon the end of the engine crankshaft, and has recesses 65 straddling the pins 58 formed as part of the standard construction of Ford engine crankshafts. As pins 58 may weak to transmit the considerable power required in the burning in procesr I surround the sleeve 55 by means of a clamping ring 59, which relieves the torque from the 'pins 58, thus preventing shearing thereof.

The burning in of thel crankshaft being completed, the pistons may now be inserted into the cylinders, and the connecting rod bearings tightenedupon the throws ofthe crankshaft. F or this assembling operation, it is of course obvious that the carriage C may readily be turned to they position most convenient to the mechanic, the clamp' 39 having first been opened, and after such position is reached said clamp. may again be vtightened to secure the carriage C in the adjusted position. Power is now againk applied through the connecting link shown: in F ig. 4 forr the purpose of burning in the connecting rod bearings, andrunning in the pistons, and the piston rings.

The running in operation completed, the connecting link shown in Fig. 4is removed, the clamp 89 is opened? and the carriage C vis rotated to and clamped-in convenient position for thelreanling of the valve guides, whereupon the valves may be ground. The engine may now be replaced, as well as the flywheel assembly which includes the magneto in Ford engines. The latter elements can conveniently be passed through the annular end member 29 of laro'er diameter. At this stage the connection of Fig. 4 may conveniently be employed to transmit driving power .to the engine crankshaftfrom the be toov CSi The carriage C is now rotated to place the engine in upright position and power may be applied from moter ll for limbering up the engine. By prefere-nce this power is applied through the assembly shown in Fig. 5. This assembly includes the same adapter 6e*- shown in the assembly of Fig. 4, and a driving link k(56 similar to link 53 which should be of smaller diameter to lit into the crankcase. Si sleeve 67 generally similar, .to sleeve connects` the engine crankshaft. to be driven from the adjacent end of link 6G.

After the motor is limbered up, the spark lugs are put into the cylinder head and the various fuel, ignition and cooling water connect-ions are made, whereupon the engine may be tested byrunning it under its own power while still mounted upon the carriage C in its original position.A

It will be apparent that in running the motor in under its own power the connecting link arrangement shown in Fig. may be employed to crank the engine prior to starting by power from motor 1l transmitted through the power shaft 3. Ratchet teeth 68 are formed upon sleeve 67 for cooperation with pins 58 on the engine crankshaft, said ratchet teeth allowing the engine to run freely when it starts firing. i

. lt will be understood that the universal lconnection of the links shown in Figs. t and 5 will compensate forv any small lateraldisplacement of the crankshaft axis with respect to the power shaft, as in the case of the reaming connection above described.

The engine should now be in satisfactory ruiming condition and can be reapplied to lthe vehicle. For this purpose it is merely necessary to remove the single bolt when the completely assembled and tested engine is free to be taken olf the assembling machine.

The various steps that can be performed upon my assembling machine will now be brieiiy reviewed.

The enOine is vrst set in place upon the carriage lt is then disassembled until nothing but the cylinder casting is left in place upon the carriage. The mainbearings are now replaced and reamed by power through the machine. Next, the crankshaft is replaced and burned in, the power being applied direct to said crankshaft. rlhen the pistons are inserted into the cylinders and the connecting rod bearings are clamped about the crankshaft, whereupon power is again applied to the engine for running in the latter parts. Thereupon, the valve guides are reamed and the valves ground, the

head replaced and the lywheelassembly including the magneto, reapplied. Power may nowbe applied to the crankshaft for testing ythe magneto. T he engine may now be completely assembled and can then be limberedv up by power applied to the` crankshaft. After this limbering up process the spart plugs are put into the cylinder head, the fuel, ignition, and cooling water connections are made andthe motor is run in under its own power for test purposes, being rst conveniently cranked by power delivered from the power shaft.

The above steps, which constitute .all of the steps ordinarily required in overhauling an engine, require but single mounting operation of the engine casting upon the carriage. When once the engine is mounted in place by the single bolt 35, theengine can be turned tothe position most convenient for performing each and every one of the above steps thereon, all by the simple process of opening the clamp 44C, turning the carriage C until the proper position is reached and again locking the clamp.

lt is of course apparent that all of the above steps need not be performed in every case and that the order .of steps above pointed out need not always be strictly followed.

It should particularly be noted that as the crankshaft axis of the engine when `mounted in position coincides with axis A-- of the carriage C, and as the klatter axis is aligned. with or onr the continuation of power shaft 3, power is readily transmitted from said shaft 3 `to thel crankshaft or reaming tool, regardless to what position the car` riage is rotated. n f

Although the parts are so designed that the crankshaft of the engine when mounted inposition upon the carriage C is coaxial therewith, it will be understood that certain of the advantages ofmy construction can be secured if the engine be secured lwithits crankshaft axis parallel ,to `the carriage axis instead of coincident therewith, in which event, the crankshaft would be aligned with the power shaft when the carriage is set in some one predetermined position.

Finally, it should be noted that although the specific installation shown and described has especial application to Ford engines, the broader features of the invention are applicable to the overhauling of various types of engines.

It will thus be seen that there is herein described apparatus in which the several features of this invention are embodied, and which apparatus in its action attains the various objects of the invention andk is well suited to meet the requirements of practical use.

As many changes` could be made in the above construction and many `apparently lOO widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as iliustrative and not in a limiting sense.

l claim:

l. In an engine overhauling machine, in combination, a bed,r an engine supporting member thereon provided `with means for rigidly mounting an engine casting, said supporting member being adjustable to allow ready access to different parts of the engine for repair and assembly, and means on said bed adapted to transmit mechanical power to said engine for repair purposes in inverted position. n

2. In an engine overhauling machine, in combination, a.' bed,- an engine supporting member thereon provided with means for rigidly mounting an engine casting, means for securing said supporting member in any of a variety of positions about the longitudinal axis thereof to allow ready accessto different parts of the engine for repair and assembly, and means on said bed aligned with the engine shaft both when lthe supporting member is secured for erect and when it is secured for inverted position of the engine to transmit mechanical power thereto in either said position 3. In an engine overhauling machine, in combination, a bed,- an engine supporting member thereon provided with means for ri idl mountin an-encrine casting an ar-A cuate seat on said bed for said supporting member, means securing said supporting member in said seat in any of a plurality of positionsk to allow ready access to different parts of the engine for inspection and repair, and a power shaft onsaid bed for transmitting power to said engine for burning in of the bearings, said parts being so disposed relative to each other that when an engine is properly mounted on said supporting member and the latter is secured inv inverted position in its arcuate `seat the crank-shaft of the engine is aligned with said power shaft.

.4. In an engine overhauling machine, in combination, a. bed, an engine supporting member, means for mounting an' engine casting on said supporting member, standards on said bed for carrying said support ing member, and permitting rotary adjustment ofthe latter about the longitudinal axis thereof to allow ready access to dil-fen ent parts of the engine for repair and assembly, means for securing said supporting member in any position to which it may be adjusted, a power-shaft on said bed aligned with the crankshaft of an engine when in place on rsaid supporting member. and means passing ltlfn'ough a recess in the end of saidy supportingmember for establishing a power connection between said power shaft and said engine. v

5. In an engine overhauling machine, in combination, a bed, means for mounting an 70 engine casting thereon, -with the axis ofthe crankshaft thereof in a single fixed position, means for securing 'said casting in any of aplurality of positions about said fixed anis of thecrankshaft, anda power shaft on said bed aligned with saidaXis.

6. In an engine overhauling machine, iny combination, a bed, an engine supporting member having a circular portion resting on said bed, means for securing an engine casting to said support with the crankshaft axis of said casting coaxial with said cir-` cular portion and means `forsecuring said casting with respect to said bed in any'of a pluralityof positions which it may assume by rotating the circular support yportion about its center upon said bed, whereby said crankshaft axis will remain in a fixed position in any said position of said casting.

7. In an engine overhauling machine, in combination, a bed, a pair of arcuate seats thereon, an engine supporting member having" a pair of circular portions revolubly resting yupon said arcuate seats, said support having means for securing an engine cas-ting thereto with the crankshaft axis of thelatter coaxial orf-said circular portions, means clamping said supporting member to said bed in any position to which itmaybe adjustedon said seats, one said circular por- 100 tion having a central opening to permit power connection with the crankshaft.

8. In an engine overhauling machine, in combination, a bed, an engine supporting member having a Lpair yof circular portions 1'05 and a beam connecting the same, arcuate seats on said bed for said circular portions, means for securing anengine casting to said beam with the crankshaft aXis thereof coaxial with said circular portions, means 110 clamping one of said circularfportions in any position to which said supporting member may be rotated upon said seats, and a power shaft on Asaid bed, aligned with said crankshaft axis, whereby a power 11.5`

being constructed. and yarranged such that the crankshaft axis Vis aligned with said power shaft when the' ybleclrvvs in inverted `iso I supporting member position for ready reaining of the crankshaft bearings, and means for securing said supporting member to said bed with said engine in said erect positiony latter under its own y venientposition for each step in the-repair and. assembly of tbe engine' e G 7 and burning in of the the elements of Lsaid overhauling machine being constructed and arranged such that the crankshaft axis of said casting is aligned with said power shaft when ythe casting is in inverted position to 'permit ready rea-ming crankshaft bearings,

and means for securing said supporting member to said bed with said engine in erect position to allow running in of the latter under its own power in its original position with respect to said support.

11; 1n an engine overhauling machine7 in combination, a'bed, a power shaft thereon, longitudinally `spaced and aligned arcuate seats upon'said bed, an engine supporting member having an intermediate -niember and circular end members, the latter resting revolubly in said seats, and being coaxial with said power shaft, means for rigidly securing an engine casting to said intermediate member, with the crankshaft axis of said casting aligned with said power shaft, and a severable power connection between said power shaft and said engine, whereby the crankshaft bearings may be readily reamed 'from said power shaft, the bearing members may be applied, and burned in by power from said shaft, the parts of the engine may be readily assembled upon said casting, 4and said supporting member may be turned to place said engine in vertical posit-ion to permit testing` of the same under itsown power in itsorigiiial mounting with respect to said supporting member. i 12. rllhe combination in an engine overliauling machine, of bed, a power shaft thereon, an engine supporting member mounted upon said bed for rotary adjustnient abouty its longitudinal axis, means for securing said supporting member in any position of adjustment, means 'for rigidly mounting an engine upon said supporting member with the crankshaft axis thereof aligned with said power shaft, to permit burning in of the crankshaft by power from said power shaft, whereby afterthe burning` in process, said supporting'member may be rotated and secured 'in position to dispose and burning in ing machine, of a bed, a power shaft there' on, an engine supporting` member comprising an intermediate element, and circular end portions, the latter coaxial with said power shaft. arcuate seats on said bedy for' said lend portions whereby said supporting member is revolubly mounted in said seats, means for clamping` said supporting member in any position of adjustnientn and means on said supporting niember for rigidly securing` a FordY engine thereon with the crankshaft axisk of said engine aligned with said power shaft, to permit burning in of the crankshaft by power from rsaid power shaft.

11i, The combination in 4an engine over'- hauling machine, of a bed, a power shaft thereon, an engine carriage on said bed, adapted to have mounted thereon an engine casting with the crankshaft axis thereof substantially aligned with said power shaft, a tool for reaming the crankshaft bearings and a link connecting said power shaft with said tool, said link having a universal connection at each end.

l5. fr carriage for an overhauling machine for engines comprising a pairof coaxialr ring members, onev of larger diameter than the other, a cross beam rigidly connecting said rings, said cross beam having` an engineJ supporting part, saidpart being parallel to the axis of said carriage.

16. A carriage for an overhauling machine for engines comprising a pair of coaxial ring members one of larger diameter than the other, a pair of channel cross bean'xs rigidly connecting said rings, one said cross beam having a substantial part of its length parallel to the axis of said carriage, andan engine rest' upon said part.

17. The combination in an engine overyhauling` machine, of a bed, ak power shaft thereon, an engine carriage onsaid bed having the axis thereof aligned with said power shaft, and adapted to have mounted thereon an engine to be overhaulech in such manner as to dispose the erinkshaft axis thereof in substantial alignment with said power shaft, and at a substantial distance therefrom, and a removable link for connecting said power shaft and said crankshaft of said engine, said link having a universal driving connection at each end.

` 18, `The combination in an engine overhauling machine for Ford engines, of a bed, a power shaft thereon, an engine carriageadjustable about a fixed axis on said bed, means for coactionwith an engine casting intermediate the ends thereof for securing the same to said carriage with the crank'- shaft axis thereof substantially aligned with said power shaft, in every position of adjustment of said carriage, whereby' when the engine is mounted on the carriage with the front end thereof nearest said power shaft, a power connection may be established be* tween said power shaft and said Crankshaft for burning in the latter. and wherebyithe flywheel assembly including the magneto may readily be assembled upon the engine casting` without disturbing said securing means, and whereby the crankshaft may then be driven from said power shaft for testingr said magneto.

19. The combination in an overhanling engine. of a bed, a 'power shaft thereon. an engine carriage on said bed. said carriage o having a large open en d portion remote from said power shaft to facilitate assemblyof engine parts therethrough and an open portion on the end nearest said power shaft, to permit application of power from said power shaft to the engine to be overhauled, and

' means for securing said engine toY said carriage, said means being disposed intermediate the top and bottoni as well as intermediate the ends of the cylinder casting of said engine, to permit all overhauling steps to be readilyl performed.

20. The combination in an overhauli'ng engine, of a bed, a power shaft` thereon, an engine carriage on said bed.y said carriage Lhaving a large open end portion reino-te thereon.

In testimony whereof, have signed my name to this specification this 23rd day of March 1920. Y f

JOHN J. SCHVA-RZ.

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