US2338081A - Cleaning apparatus for cylinder heads - Google Patents

Description

Jan. 4, 1944- F. c. AREY ETAL CLEANING APPARATUS FOR CYLINDER H EADS I Filed Jan. 29, 1941 5 Sheets-Sheet 1 Jan. 4,1944. F. c. AREY ET AL CLEANING APPARATUS FOR CYLINDER HEADS I Filed Jan. 29, 5 Sheets-Sheet 2 Jan. 4, 1944,, F. c. AREY EIAL CLEANING APPARATUS FOR CYLINDER HEADS,

Filed Jan. 29, 1941 5 She ets-Sheet 5 Jan. 4, 1944. R AREY T f2,338,081

CLEANING APPARATUS FOR CYLINDER HEADS 5 Sheets-Sheet 4 Filed Jan, 29. 1941 Jam. 4, 1944. I F. c. AREY ETAL 2,338,081

- CLEANING APPARATUS FOR CYLINDER HEADS I Filed Jan. '29, 1941 5 Sheets-Shet 5 'vt ffmw' e maa 4.1944 V, 123585081. e

head in the casing. I v v The object of the present invention is to provide means for handling each'head, after it has- .1=,. a CLEANING arraaa'rusron CYLINDER.

a Hnnsns 1 I Fred C. Arey, Freeport, and De 1.05 E. Hibnen Du Bois, 2a., assignors to Vulcan Soot Blower Corporation, a corporation of Pennsylvania t humani arian-129,194; sesame-mm Thepresent invention relates to apparatuses for cleaning the cylinderheads of internal combustion engines by removing thereirom core ma- 'terial, loose scale, dirt, metal chips and-oil. In our prior Patent No. 2,234,909, granted on March 11, 1941, there is disclosed an apparatus for this purpose.

step by step. the cage being adapted to contain a plurality of heads ,whichareinserted '.and removed, one at a. time, through the front end 0!:

the casing wheneverv'a head-receiving comparts ment 6! the cage .lies in; the plane of the table from which-the heads.- are fed into the casingi In this prior apparatus each head must be with-.

drawn through the front end of the casing belore another head can belnserted, thereby re- In that apparatus there is a casing Y or housing containing a cage adapted to be turned .ing hot air or other gaseous material over the exteriorland interior surfaces: all of the mechanisms, being so coordinated that this subsequent drying operation takes place during the time the 'cage is travelling through anyone of itsv steps,

so that thedrying station will always be found empty whenever a head to be dried reachesit. 'The various. features of novelty whereby our, invention is characterized will hereinafter be 'pointedwout with particularity inzthe claims; but, for aiull understanding'oi' our invention and!!! g its objects and advantages, reference may be had quiring the operator to spend about twice as I much time iorinserting and againremoving a head from the casing as is needed to place the been washed in the casing, in sucha manner that the removal of the head doesnot require a separate operation on the part of the workman,

but is efl'ected automatically'through the insertion of anotherheadv in the casing, thereby re-' ducing, by approximately one-half the time which the workman must-spend in inserting'and removing the heads.

A further object .or the present invention is to insure that theheads shall be' quite, d y after being washed, without increasing the length of time during which they must remain in the cas-'- ing in which thewashing takes place.-

In carrying out our invention, the casing of the washing apparatus may have a reardischargs 1 opening as well as the inlet at the front so that,

whenever a cylinder headis pushed into the easing from the-front, 'it pushes out-through the back of thef-casing the headwhich is, ready to be discharged. .In order to reduee'to a mini- 'mum' the amount of energy thatthe workman has to expend, provision is'made for automatianywork done upon ahead after it leaves the casing does not interfere with the 'Washing'op- 'erations that are being carried out in the casin means are also provided whereby, alter being $0 the following detailed description taken in conmotion with the accompanying drawings, ,wherev in: Figure a machine or apparatus embodying the present invention, a portion of the initialwashing ap paratu being shown in section; Fig.2 is a-se tion on a somewhat largerscale than Fig. 1, on

' line [-2 oi Fig. 1, showing only the rotatable,

cage and the tripping device mounted in the cas-- ing below the same; Fig. 3 is a section on .an enia'rged scale, taken on line 3-3 of Fig. 2; F 4

is a horizontal section through the rear end oi? the; casing in which the work is washed and a .top, plan view oi the work-receiving apparatus,

" top plan view or the apparatus that lies;i ust tof the right oi that shown in Fig. 4 and which re--; 1

immediately in rear of the casing: Fig. ,5 is 9" ceives the work from the latter and dries it; Fig.

6 is a more or less diagrammatic view illustrating iragments oi the apparatus'appearing in Fig,

, 5, and showing a, cylinder head at the limit 01 its rearward movement before it is shiitedinto position for being dried; Fig. 7' is, a viewsimilartp I Fig. 6, showing-the cylinder head in the position which it occupies at thefend or. thedryingop- .eration an again begins its travels toward the 5 cally withdrawing each head from the casing after it has been pushed out'a little way. Since-j withdrawn from the casing, each head is ma- I 'nipulated soas to empty it of any water or other washing liquid that may have been pocketed therein and thoroughly to dry the head by blowa rear, namely, toward the right, as viewed in Figs.

' 5 and "7; Fig. 81s a section taken on lines 8-4 I ofFig. 5; Fig. 9 isa section through the main. 1

and pilot valves shown in Fig. 8. and there bein also illustrated the tripping. means for. thepllot' valve; Fig. 10 is a section on line iii-lo 0! Fig. 5,,

the greater portion of the hollow drying. plate being omitted; and Fig. 11 is a side elevation of I the clutch actuating mechanism appearing in Fig. 10, the clutch being and openin Fig. 10. 1

Referring to Figs.'1 and at: the drawings, I q represents a large housing or casing within which isa long cage 2 rotatable about a horizontal axis extending from front to rear of the easing; the cage containing open-ended compartments for i s. a viewillustrating,inside elevation shown closed in Fig. 11 i receiving fourcylinder heads A distributed to form a hollow square. This cage is adapted to be turned step by step. through angles of ninety degrees and to come to rest at the end of each. step with one of the compartments at the bottom and in about the same plane as a feeding table} at the front end of the casing. While the apparatus is in operation, cleaning fluids are discharged upon the heads carried around by the cage. Each head is turned upside down and then right-side up again during the time it remains in the cage, thereby permitting the washing water or other liquids to drain from the same and carry away such ideas foreign matter as is not driven of! directly by the cleaning jets. This apparatus may take any usual or preferred form, that illustrated being the same as the apparatus forming the subject matter of our aforesaid patent. No further description of this portion of I the apparatus is needed here except that it should be noted that the cage is supported by a horizontal shaft 4 which serves also as a conduit for supplying the washing water or other liquid; this shaft being driven by means of an electric motor I through suitably controlled transmission means; and cleaning fluid being supplied through a large main I, all as explained in the aforesaid application.

The present improvements have to do with the handling of the cylinder heads or other pieces of work that may be cleaned in the same way as such heads, after the heads have received the desired treatment within the casing and must be removed therefrom,

As shown in Fig. 1, there is an opening I in the rear wall of the casing I just behind the rear end of the lowermost compartment I in the cage 2. In accordance with our present invention, in-

' of rotation of the cage, namely at right angles to the direction in which a cylinder head is moving when it is pushed out through the casing upon these rollers. Above the roller nearest the casing is a cooperating roller ll, whereby the rearwardly-moving head is gripped and positively moved along until it has been brought clear of the casing and is delivered to-another set of rollers to be hereafter described. The rollers II, as best shown in Fig. 4,- are driven from a suitable shaft 12 mounted in a gear housing ll extending along corresponding ends of the rollers and having bearings for those ends; there being suitable driving gears II between the shaft i2 and'each of the rollers ll. The roller ii is geared to its cooperating roller in by suitable gear wheels ii as is common in the case of pairs of feed rollers. The shaft i2 is continuously'driven, while the machine is in operation. from a motor ll mounted on the same elevated support it that carries the motor I, through a sprocket chain it or other suitable means.

Behind and aligned with the bed or table 9 is another bed or table 20 provided with a series oi feed rollers II similar to and parallel with the rollers ID. The feed rollers 2|, as shown in Figs. 5 and'8, are driven from a shaft 22 similar to the shaft l2, arranged in a housing 24 at the side of the bed or table II through suitable gear drives 2! similar to the gears II. The shaft 22 is driven from the motor I! through a second sprocket chain 20.

In view of the fact that each cylinder head must be pushed out through the rear of the casing in which it is washed, a movable stop must be provided to insure that each head will stop at exactly the right point when it is pushed into the casing. and will not become accidentally.. displaced until it is ready to be discharged from the casing. We have therefore provided each compartment of the cage with a retractile stop located at the rear end thereof these stops pro- Jecting into the compartments for engagement with the rear edges of the cylinder heads at all times except during these periods where they must be withdrawn into idle positions to permit the discharge of the heads. As appears in Figs. 1. 2 and 3,'four little housings 21 are arranged radially on the exterior of the cage 2 at the longitudinal center and near the rear end of each of the four work-receiving compartments. In each housing is a plunger 28 acted upon by a compression spring 2! that tends constantly to force the inner end of the plunger into the interior of the cage, namely into the interior of the corresponding work receiving compartment. The outer end of each plunger extends through the outer end of its housing and is there interlocked with a rocker arm 30 pivotally mounted on a suitable bracket II projecting from the little ,housing for oscillation about an axis parallel with the axis ofrotation ofthe cage. 0n the free end of the rocker arm is an adjustable. pin 32 extending through the arm in a plane at right angles to the axis of rotation of the cage.

- In the bottom of the main casing I, in about the plane of the four stop devices, is a little frame 34 held in place by spaced brackets 35 so as to be slidable in the direction of the length of the cage. On this frame is a cam-shaped cross bar I! which, when the frame is in its forward position. as shown in Fig. 4, lies in the plane of the four pins or screws 32 on the stop devices. The parts are so proportioned that when the cam is in the position shownin Fig. 4, each screw 32 engages with the upper edge thereof, as indicated in Fig. 2, as the corresponding work-receiving compartmentis very nearly in its work-receiving and work-discharging position. and causes the corresponding rocker arm to be rocked in the direction to withdraw the plunger with which it is connected from the work-receiving compartment. Then, while the cage remains stationary, the path behind the lowermost cylinder head is clear and this head may be pushed out through the rear of the easing, as heretofore explained, by the pressure of another cylinder head which is being moved into the same compartment from the front end of the casing.

It will be seen that the little frame 34 has a limited lengthwise movement, being shown at one end of such movement in Fig. 4 and being adapted to be shifted toward the right a distance somewhat greater than the thickness of the cam bar or shoe 38. When so shifted toward the right to the other limit of its movement, it no longer has any influence on the stop device, the retraction of which it had previously brought about, and'the spring associated with that de V v 2,388,681 inder. head starts to have but through the tees or the basins, t e c'vl hderheeujmust pa's's ever the pliinger and its trailingend-mustqbe cleai'f 'of the plunger before the latter can snap liplnto workingpositionagain; -In=order 'td'ayoid having the blunger releasedwhile a cylinde'r head is may ing across the same, which would. result i the plunger pressing u'p'a'gainst itheiunderside or the cylinder head and scraping I alongthe same,

meansareprovided to leave the cam in its'wo'rk' in'g p sitiohuhtu the cylinder head that is be-' ing; removed has passed beyeha the plunger;

T this. end there is provided near the reareiid of the first coh eyofr 'deyicepcomprising the feed rollers Ill and ill, at'ransverserock shaft-V31 hav in; an upwardly projecting radial arm 38 which is connected t the rear end of the little frame u by a rod :9. Another emit-extends up wa'r'qly and rearwardly-from the rock shaft tb a point behind and'abovethe rea'rmest roller ill,

the upper end of this farm being proyided withlan; 1

anti-friction device 4|. when the leading" end of a cylinderhead contacts the anti friction aeyice oh the upper end of the arm 40,11; causes the rock shatt-fl to turn in the direction to draw th'eframe 34 towesathe right, as viewed in FIE.

4. Consequently, by carrying each cylinder head away quickly; after it once becomes engaged with H theilrst conveyor de yice, the stop devicerreinains locked in its idle position izntil aiter theretract ing cylinder head is beyond thesame and then the 'cam carrying frame is qiiicklyshifted so as to cause the stop to be in itsworkingtposition before the interning hehdreachejs it. Then, after the discharged head leaves the'ilr'st setloi feed rollers,fa spring 42-, acting on the connecting rod 39, causes the ,fran'ie 84 to be returned to its f working p Sition, Inlthe meantime, the 'oag'e has againstarted a turning movement, carrying the stob device behind the newly inserted cylihde'r head away from meant; so that all 61 the stops remain in their working positions until the age again completes 'a' quarter turnend brings another hea into dischar e p sition.

As a cylinder head moves beyond the first groii'p of feed rollers, it enters v upon the f second group 2| between a guide 44 extending throughout the length of the grouper rollers'atbne smear the apparatus and a shortkuidfelblock' 43 at thei'or ward end of the group of rollers; the head travelpis e, into thetuhularinemhers. ai r ai iyerea trite the enter weer s de or e hllow mete;

of the gear housing. In FigQB th is'shaft is shown in then angular pQSitlml tha t the jal frl s i4 lie jllst below the plane 'f the tops of therollers 2|. The base'ends of the'arms 5'4are Leshaped, so that one leg (if each extends upwera ywhehthe arms are horizontal, while the other legs ek tehe h orlzohtally to mee and embre'ee the shirpdr'tme shaft 55. Th 11S, the long straightportion of each of the arms has hear the inner for base end a shoulder as that s vertical at the ime the arm lies horizontal, ,FOr this reason;

cylinder head has c orhet rest a ainst the top 15, the turning of the shaft t the c1o' kw se direction, as viewed in Fig. 8,; will cause the 'eylinder head tdbe lifted'and swan-g up; The dis} tance between each 6f the shofild'ers 5e aha the guiding face of the guide member 44, at thetime the'arins 54 stand in their horizontal, lowered positions, is considerably 'g'r'eaterth'anethe width or one of the cylinder heads. .-:;Forthlsreason, the cylinder head eme in contact with the guide 44 at the time it is lifted u by the ar s, the'head w'iu snqe dewnwermyelone the 7 arms until it strikes the shoulders .56., when;

whenthe arms are again swung down the, cylinder head will remain in engagement withthese 1 shoulders and thils besp e'eea substantial dis tance away from the guide 44. These two con ditions are illustrated in Figs; ena 7,;Fig. 6 showing a cylinder head engaged with the stop s 45 while still in-vcOntact with the guide along which it travelled to reach the stob, whereas in Fig; 7 the cylinder head-is showh spa ced apart. from theguide 44 afterhaying been lowered from an upright position. This ljateralshi fting' of the cylinder head isutillzed to control the operation of the swinging support, the discharge 7 of the drying air, land the nnarr'emo m of the ling along "uhtu itstrikesa fixed stop 4!, which is'b'est "shown in Fig. when the head reaches this stop, it is nicked hpand placed on} edse" to drain any remaining water therefrom and to subject it to strongjets or blasts er air for com pletely drying the same. Y

j The drying apparatus comprises a thick rec tangular'plate '44 extending throughout'the en- V tire length of the second feeding unit andsum ported on'edge at a considerable distance above the rollers by suitable uprights" rising from the bed or table '20 on the side opposite that at which the 10! siiide bar 44 is located. This 'plate is provided with numerous little nozzles or jetting devices '44 on the inner side;*these behis so disrio'sed as to register with various holes that have beendrilled into the head, and ther openings in what is the underside of the head 1 as positioned on the eng ne cylinder. There'is also a series'of aligned tubes 49, closedat the ends, arranged'oh the inner sweet the, mate along" the upper edge; these elements being connected to the up'nerpa'rt of the hollow plate by means or tubular stems "through which air may be deliyered from the interioroi the hollow cylinder head from the second groiliiorbattery or teed rollers without beinginterfered with by the "stoh 45.

The shaft 55 has a radial arm 51 met; there'- to. A connecting rod 58 extends from the free end of this arm totheupper ehdof a compara tively long' lever 59' 'whi'ch stands; almost vertical outwardly beyond thesear box, and is pi o ed j at its lower end, as indicated at 80, to a stationary' part ity of the bed or table' 29. Betweeh the ev'er 5s and the gear, sex :4 is e sha ts:

thatiis parallel with'the shaft, Fixed to the shaft s2 is a cam 4 in therorm er a disk hav ng f' in'the edge thereof a valley 6! which constitutes the low point on the cam. The lever 58 is proreaches the u'nlznutilated pgzvrtiq'nfoiv the edge of the" disk, the amen standtipright, asshowniin" dotted lines in Fig'. 8,and the cylinder headis held thereby in proper reeistrationi'with'the iet 4 tin; devices on the'hollow plate 46. Aifter the v threa'gh a lathe bite; at eohteihihgemaih cam has completed the greater part of a revolution, the, cam roller again runs downhill andinto the valley so as to restore the parts to the positions illustrated in full lines in Fig. 8, Thus, a single revolution of the shaft 62 causes acycle of operation of the head-lifting arms to be completed. Since the unmutilated portion of the cam edge is of much greater anguiarlength than is the valley portion, each cylinder head is held in the upright position during a substantialinterval of time and, by admitting heated air into the hollow member 46 during that period, the

' head is effectively dried.

. so shaped and so disposed that the finger 8i pro- 1 namely the-roller 212, is also cut away at that end The shaft 82 operates only intermittently under the control of the cylinder heads themselves. In the arrangement shown, the shaft 22 that drives jects above theto'.) of the rollers 2| in the Path of an, oncoming cylinder head to be dried, when I the clutch is open. whereas the finger 82 projects above thetops of these rollers when the clutch is of the two endmost feed rollers 2|0, 2H are cut away. as best shown in Fig. 5. The end of the body portion of the third feed roller from the end.

of the roller farthest from the guide 44. The finger 82 is spaced far enough away from the guide 44 so as to lie outside of the path of the cylinder head moving 'along the guide 44 into I position to be picked up by the arms 54, whereas the feed rollers 2| extends beyond the end of the v gear housing 24 and into a smallertransverse gear housing 81 from which protrudes a tubular shaft 88 (best shown in Fig. 8). The tubular shaft 88 surrounds the shaft 62 and is constantly, driven; whereas the shaft 82 turns only when it is clutched to the shaft 88'. The shaft 68 is much shorter than is the shaft 62 so .as to provide room for the clutch member 1i fixed to the shaft 62 between the movable clutch member 69, mounted on the free end of the shaft 68, and the stationary .bearing III for the projecting end of the shaft 62. Whenever the clutch is thrown in, the shaft 62 is caused to rotate.

The immediateactuator for the movable clutch member 88 is a lever 14 in the form of an inverted charge end of the latter, namely close to the fixed stop 45. This shaft has on the end thereof ad-v the finger 8! is spaced apart from the vertical plane of the two shoulders 56 on the-arms 54,. when these arms are down, more than the width of a cylinder; head.

The result of the construction just described is that when a cylinder head is fed along toward the stop 45, incontact with the guide 4.4, itstrikes as'this happens, the lifter begins to swing up and places the head in position for its hotair treatment.- After the shaft 62 has completed a revolution, the cam roller drops into thevalley on the jacent to the clutch actuator 14 a rigid radial arm I8 extending in the upwarddirection. A rod 11 is hinged at its lower end to the upper end of the arm 18 and extends slidably through an ear I8 fixed to the upper end of the lever 14. Surrounding the rod Tl, betweenthe ear l8 and a shoulder 18 on the lower end of the rod, is a coiled compression spring 80. -The parts are so proportioned that the arm 16 and the rod 11 act as a toggle that may break in either direction and one member of which is resilient in the lengthwise direction. In other words, when the rod and the I center line of the arm 16 make an obtuse angle while lying on one side of a straight line passing through the middle of the ear [8 and the axis of the shaft 15, as shown in Fig. 10, the clutch is cam and, the weight of the arms 54 and the cylinder head being off center, the arms with the cylinder head thereon swing down from the dotted line position 01' Fig. 8 to the full line position. This condition is illustrated in Fig. 7 from which it will be seen that the cylinder head lies inwardly from and clear of the finger 8|, but overv been brought to the starting position illustrated in Fig. 5 and the clutch has been caused to open. In other words, the cylinder head can now move onward beyond the discharge endof the battery of rollers 2| to another conveyor, not shown, adapted to "carry the heads away for storage or assembly purposes. This final discharging movement of a cylinder head is accomplished without interference on the part of the finger 8| which,

i at this time, lies'at one side of the path of travel held open. Then, if ,the shaft is turned in the clockwise direction, as viewed in Fig. 10, until the hinge axis between t e rod and the arm 18 pass to the other side of th aforesaid line or center, the spring 80 is first placed under greater I compression, and is then permitted to expand by forcingv the clutch actuator 14 into the clutch closing position. illustrated in Fig. 11. The opening and the closing of the clutch may therefore be brought about by simply oscillating the shaft 18 through a small angle, first in one direction and then in the other.

In order to provide means. for oscillating the, shaft ll, it has thereon two curved fingers 8| and 82, spaced apart from each other lengthwise of the shaft and so shaped that upon being viewed from one end of the shaft, they present somewhat the appearance of a horseshoe. These fingers are ofthe head- However, as soon as the cylinder head reaches the position shown in Fig. '7, the

apparatus is ready to receive the next head which may then engage the finger 8| and cause the shaft 15 to turn in the direction of the arrow in Fig. 6 before the head comes to rest against the stop, 48.

The main valve 52 for the delivery of air for drying the heads is controlled bya pilot valve 84 in the same way that the delivery of washing liquids to the washing station is controlled. This feature is shown in detail in Fig. 9. In Fig. 9 the hot air enters the righthand end of the casing of the main valve and, when the movable member 85 of the pilot valve is in the position illustrated, air may flow from the interior of the righthand ,side of the main valve casing through pipe 86,

through the casing of the pilot valve, and back through pipe'8'l to a point above the piston valve 88 in the main valve device; whereby the pressure of the air assists a compression spring 88 behind the piston valve in holding the latter closed.

when the movable, pilot valve member 85 is able pin or plug 93.

' cent to the drying. station, so that-there I of the piston valve in a direction to open the valve so that, when the hot air is at a sufficiently high pressure to perform a drying operation success-,-

fully, it applies a sufficient pressure to the piston. valve to overcome the resistance of the. spring and] Even when the thereby force the valve op n. movable member, of the pilot valve has been pressed inwardly to bring about. the opening of the main valve, thereis pressure behind the movable pilot valve member so that the parts of the pilot valve constantly tend to maintain the relative positions which they occupy in Fig. 9.

As is customary, the movable member 85 of the pilot valve is provided with a stem OI which projects outwardly a short distance beyond the valve casing. What may be termed the opening of the pilot valve may be effected by pushing this stem back into the valve casing. This is accomplished by means of a radial arm 82 fixed to the hinge shaft 55 and having in the outerend an adjustv The parts are so proportioned that when the swinging device for raising and lowering a cylinder head is down, as shown in full lines in Fig. 8, the pin or plug 81 is remote from the end of the valve stem 8|, so that the main valve remains closed. When the head-lifting member is swung up into the dotted line poe sition of Fig. 8, the parts! strikes against the end of the stem of the pilot valve and presses;

the latter back into the position that causes the main valve to open. By this means, as the cylin der approaches its upright, on-edge position, it is subjected to numerous blasts or Jets of air from the pilot valve ceases and the supply of air is imsary to introduce the heads into a washing apparatus. Not only is there a great saving of labor but, by providing separate washing and drying stations, twice as many heads can be washed and dried in a given time as would be the case if both operations took place successively in the same station. Furthermore, this arrangement permits complete drying of heads which could not otherwise be properly dried in the apparatus that washes them, without reducing the number of heads that can be passed through the apparatus in a given time.

mechanismsat the drying station, including the devices for causing drying air to be discharged, operate only when there is a cylinder head adian It will also be seen that the waste of power or drying air. We have referred to the, work to be treated as consisting of cylinder heads and have illustrated i an-apparatus and mechanism especially adapted for the washing and drying of such heads. Other things, however, adapted to betreated in accordance with the principles on which the aforesaid I apparatus and mechanisms are based. may be, 10- handled in the same 'way. Therefore, when we refer to cylinder heads, we mean anyobiects susceptible of a corresponding treatment.

While we have illustrated and described with particularity only a single preferred form of our invention, we do not desire to be limited to the,

exact structural details thus illustrated and described; but intend to cover all forms and arranger'nents which come within the definitions of our invention constituting the appended claims.

We claim:

. 1. The combination with a washing apparatus for cylinder heads into which heads may be insorted one at a time from the front and be discharged,-after being washed, at. the rear end, of

a stopfor-engagement with a head entering the apparatus and arresting its rearward movement upon reaching the washing position, said stop beingmovable between a working position and an an idle position, a conveyor in-rear of the said ap paratus to receive each head when it is pushed rearwardly out of the apparatus, and means con r trolled by a head on the conveyor to shift the stop to arrest the rearward-motion of -the next head which is inserted in the apparatusand pushed back into the washing position; f

2. The combination with an apparatus/for washing cylinder heads, including a rotatable" holder into which a head may be inserted froml h o the front end tobring it into washing position,

of 'a stop at the rear end of the holder'for engagement with the head when thelatter reaches I j the washing position, a conveyor beyond'the lat-v ter end of the holder to receive a washed'head 4 and automatically carry it away upon'the withdrawal of the stop and moving the head a short distance beyond the rear end of the holder, and means controlled bythe angular position of the and upon the conveyor by a head moving rear wardly into washingv position.

3. The combination with an apparatus for washing cylinder heads, including a rotatable holder into which a head may be inserted from f the front end to bring it into washing position, of a stop at the rear end of the holder for en-' gagement with the head when the latter reaches the washing position, .a conveyor beyond the latter end of the holder to'receive a-washed head and automatically-carry it away upon the withdrawal of the stop and moving the head a short distance beyond the rear end of the holder, and

means controlled by the angular position of'the holder to cause said step to shift from a working position to an idle position so that a washed head may be pushed rearwardly out of the washing position and by a head moving rearwardly on the 7 .conveyor to cause the stop to assume its working position again.

4. The combination with an apparatus for washing cylinder heads, including a rotatable holder into which a head may be inserted from the front end to bring it intowashing position,

of a spring-held stop at the rear end of the holder for engagement with the head when the latter reaches the washing position, a conveyor beyond the latter end of the holder to receive a washed head and automatically carry it away upon the withdrawal of the stop and moving the head a short distance beyond the rear end ,of the holder, a cam element located so as to be engaged by the stop when the holder is in the proper angular position to permit a head to be moved therefrom to the conveyor and cause the stop to shift from -the working position to the idle position, and

means controlled by a head on the conveyor to shift the cam into an idle position clear of the stop.

the front end to bring it into washing position, of a spring-held stop at the rear end of the holder for engagement with the head when the latter reaches the washing position, a conveyor beyond the latter and of the holder to receive a washed head and automatically carry it away upon the withdrawal of the stop and moving the head a short distance beyond the rear end of the holder,

a cam spring held in a working position for engagement with said stop and for shifting the latter into an idle position when the holder occupies the proper angular position to permit a head to pass therefrom to the conveyor. and means controlled by a cylinder head on said conveyor to cause said cam to shift into an idle position clear of the stop. I

FRED C. AREY.

DE L08 E. HIBNE

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