US1913090A - Heat treating apparatus for metal work - Google Patents

Description

Jupe s, 1933. i H. ROSENBERG 1,913,090

HEAT TREATING APPARATUS FOR METAL WORK m his ma' June 6, 1933. l H. ROSENBERG 1,913,090

HEAT TREATING APPARATUS FOR METAL WORKV Filed Aug. 20, l19551 5 Sheets-Sheet 2 HEYMAN RUS ENE ERB,

7m www.

June 6, 1933. Ht ROSENBERG 1,913,090

HEAT TREATING APPARATUS FOR METAL WORK Filed Aug. 20, 1931 5 Sheets-Sheet 3 HEYMAN RUSENBERE,

June 6, 1933. H. Rosi-:NBERG I 1,913,090

HEAT TREATING APPARATUS FOR METAL WORK Filed Aug. 20, 1951 5 Sheets-Sheet 4 HBYMAN RDSENBERE,

if amg June 6, 1933. H, ROSENBERG 1,913,090

HEAT TREATING APPARATUS FOR METAL WORK Filed Aug. 20, 1931 5 Sheets-Sheet 5 FI E- El V Q9 51V 55 j L 55 A54 5a DD Se @D Q A O L` ,A

ooo(D O @D 36 s@ ff/ 5, 45 38 55 37 E M FI E. ll- 4E Bz ,37 5@ Hf-LIHLIQI: 11, lllg'llHHili 1^4l .4,0v sa 3 sa 4e 87 g 86 38 36 SIMM 62 1 6 HEYMAN R m 5 EN@ mg,

` Patented June 6, 1933 i Parral oFFlcE HEYMAN nosminae, or NEW YORK, n. Y.

naar 'firearms APPARATUS ronivm'rrn:r wenn" Applicationled August 20, 1931. -Seral No. 558,413.

In the case-hardening and other heat treating of small metal articles,`1 have found `the apparatus disclosed in my U. S. Letters Patent No. 1,7 86,508, dated` December 30,

5 1930, and also the apparatus disclosed in myco-pending applications, one filed September 24, 1929, Serial No. 394,832, and the otherl filed April 29, 1980, Serial No. 448,349, gratifyingly eficient for the purpose intend- 1 ed, and it is one of the objects of the present invention to provide an apparatus for treat ing larger articles, which apparatus is susceptible by very slight modification of being transformed into substantially the same r or the mechanical equivalent of the same apparatus'as` set forth in my saidpatent and pending applications, so thatthe present improved apparatus is well adapted for use primarily for the treatment of larger articles While enabling the user, without any substantial expense, to transform the plant into one fortreating the smaller articles and again transform the plant to` its present adapted use. 1

It should be` understood, therefore,that i throughvarious details of my' said patent and pending applications, and other of my pending applications, have been omitted from the disclosure in the accompanying drawings, such omission is for the purpose of clarity of disclosure of the new matter, and such details may be used with such new matter lor in the transforming of the plant for the treatment ofthe smaller articles to any extent found available and desirable; and, to that end, reference is had to my said patent and.` pending applications for details such as are susceptible of` ready application to and use with the plant herein set forth. E i It should, of course, be understood that While the present improved plant is especiali ly adapted for the treating of larger articles l, as `compared with the smaller articles of o said patent andV pending applications, the `term larger must be accepted inf its relative `sense andlimited to physically` available possibilities, as, forexample, the smallerarticles, while not tombe definitely limited, may be represented by such products as screws, screwnails, washers, nuts, bolts, and the like, and the larger articles, while not to be definitely limited, may be pinions, gears, discs, and like devices such as are commonly employed in automobile construction, and the range of sizes willbe limited only by the available physical capacity of the work holders and containers provided. The actual size of the article to be treated, therefore, is not to be considered a determining factor except where `it is too small or too large to be conveniently or effectively handled by the apparatus disclosed.

Among the objects in view is'tlre successiveheat treatment of articles of metal work under conditions affording effective results at an expenditure of minimum cost and minimum time. j

j Another important object is the arrangement of the plant as a condensed unit for a substantial saving of space.

All of the numerous objects set forth in my above-mentioned patent and pending applications are also true of the present invention as applied to the treatment of larger articles, and specifically true ofthe plant when transformed for the treatment` of smaller articles. i

A still further and more detailed object is the ready transporting of a work holder B0 successively to successive points of treatment by mechanical apparatus not requiring manual intervention for the location, deposit or detachment ofthe work holder from its carrying means, and in this connection a still more specific object is the swinging of` the wlork holder through an arc from point to point for successive treatment Without the necessity for complicated Y or expensive vehicles of transportation.

With these and other objects in view as will in part hereinafter become apparent and in part be stated, the invention includes the provision of successive heat treating apparatus and simple,V easily-operated means for detachably transporting work holders successively to the points of treatment.

The invention also includes housings or enclosures for all suchapparatus forconserving-heat, preventing the work holders from exposure to chill during transportation from point to point, and for exhausting vapors and gases without releasing the same into the space occupied by operators.

The invention also comprises certain other novel constructions, combinations, and arrangements of parts as will hereinafter be made clear and be subsequently pointed out in the appended claims.

In the accompanying drawings,-

Figure 1 is a longitudinal, vertical, central section through a completely organized plant embodying the features of the present invention, parts being seen in elevation.

Figure 2 is an enlarged, detailed, fragmentary sectional yelevation of one of the work holder arms and adjacent parts, showing a work holder in position.

Figure 3 is a side elevation of the same parts seen from a plane at right angles to the plane of the section of Figure 2.

Figures 4, 5, and 6 are further enlarged, detailed elevations showing the successive positions of the pick-up hook for the work holder, cooperating parts being seen fragmentarily in elevation and in section.

Figure 7 is a top plan view of the discharging tray from the quenching bath seen detached, and shown on a scale approximately that of Figures 2 and 3 but slightly smaller.

Figure 8 is a fragmentary, sectional elevation of the parts seen in Figure 7, the section being taken on the plane indicated by line 8-8 of Figure 7.

Figure 9 is a transverse, vertical section taken on the plane indicated by line 9 9 of Figure 8.

Figure 10 is a fragmentary, enlarged, vertical section taken transversely through one of the marginal parts of the discharge tray at the place of the pivot pin for the work holder receiving cradle.

Figure 11 is an inverted plan view of a Work holder detached. Figure 12 is an enlarged, detailed elevation of one of the arms of the work holder showing the preferred serrated form of'its upper edge for facilitating retaining articles' of work in spaced relation.

Referring to the drawings by numerals, 1 and 2 indicate furnaces, and-3 a quenching vat arranged preferably as seen in alinement and having the upper areas above them enclosed in a suitable hood or housing i provided with discharge flues `5, 5, Lfor carrying off the gases, fumes, and volatiles from the plant. The flues 5 are, of course, preferably connected with appropriate draft apparatus, not illustrated, and the velocity of the draft may be controlled by slide dampers 6 to insure against escape of objectionable fumes into the room or other area outside the treating apparatus. A receiving line with the several parts of the plant, the table being preferably sustained on a framework 8 supporting a hopper 9, which hopper is not used While the table 7 is employed, but the hopper 9 in intended for use when the plant is transformed into one for treating smaller articles, as will be readily understood by reference to my above-mentioned patent.

The furnaces 1 and 2 are, of course, susceptible of a wide range of variation. One form of furnace found to be quite acceptable is that utilizing gas as a fuel, but the invention is not to be limited to the character of fuel or types of furnace employed.

Mounted on and forming part of the cover of each furnace 1 and 2 is a plate 10 which is centrally apertured to accommodate the passage of a receptacle or housing mounted to detachably extend into the furnace, the said receptacle being indicated at 11 for furnace 1 and at 12 for furnace 2. Receptacle 11 is preferably of the type adapted to take the place of the common drum or like housing customarily employed in preheating articles to be tempered, and the receptacle 12 is preferably a pot for containing cyanide in a molten condition, or like treating bath. The vat 3 is supplied with water or oil, or other appropriate quenching fluid, and its temperature is preferably maintained low by circulation after the manner set forth in my abovementioned patent.

As clearly seen in Figures 5 and 6, each of the receptacles 11 and 12 (12 only being seen in these figures) is provided with a peripheral flange 13 at its upper edge which overhangs and rests on plate 10, or other parts t of the cover of the respective furnace. At the line of juncture between the flange 13 and the respective receptacle 11 or 12 the wall of the receptacle is rounded at 14 to prevent the presentation of a sharp edge, and to aid in' the camming action of the work holder as hereinafter mentioned.

The furnaces 1 and 2 and the vat 3, as well as frame 8, may be and are preferably rigidly connected together so as to stand as substantially a continuous framework, and the mounting of various parts hereinafter described on that framework is controlled largely by the consideration of facility, convenience, and effectiveness of location. With this in mind, there outstands from the said framework, and preferably from that part of it making up the plate 10 of furnace 2, a pair of sleeves 15 in which is journaled a shaft 16 which shaft extends through pendent eyes 17 of an operating lever 18, which is bifurcated to produce arms 19 and to provide a space between said arms through which a work holder may be swung. These parts are arranged at that side of furnace 2 adjacent furnace 1 so that the arms 19 overhang the furnacel withthe free ends ofthe arms 19 extending beyond the 4transverse i center line of the receptacle 11.

Atthe opposite side of furnace 2 and carried by the framework of the plant, and preferably that part making up the plate offur-nacef2, are upstanding sleeves 20, 20, identical in form and arrangement with sleeves except thatthey do not upstand quite so high to accommodate'the movement of the `parts carried thereby.` A shaft 21 is journfaled in the sleeves `and keyed -or otherwise iXed` toV eyes 22 pendent from lever 23, theshaft 21 being identical'with shaft 16,eyes 22 with eyes` 17, and leve-r 23 with lever 18, the lever 23 being bifurcated to provide arms 24 similar to arms 19. These parts being identical will be understood to be disclosed on an enlarged scale in Figures 2 and 3, though these iigures specifically show only the lever 23 and its connected parts.

Each -of the shafts 16 and 21 extends i transversely of the plant to beyond theside respect to lever 23.

thereofand is provided with actuating mechanism, such as illustrated and described in my above-mentioned patentand pending applications, so that the shaftsmay be readily rocked for oscillated toswing the levers from positions in advance to positions in the rear, as indicated in `dotted lines in Figure 1 with Each of the levers `18 and 23 carries a means of pick-up and let-go for workor a work-holder, so that the work or work-holder may belifted by one of the levers from its position in one ofthe receptacles and moved by the lever and released in the other receptacle, and then picked up by the second lever and moved from the second receptacle to the quenching bath, and vthere released to be discharged by the discharging tray of the quenching bath; As the pick-up and let-go for the two levers 18 and 23 is identical mechanism, but one is illustrated in detail and seen in Figures 2 to 6 inclusive. Connecting the two arms of the respectivelever substantially Lat their free `ends is a cross rod 25 on which is freely, pivotally mounted a pair `of pick-up hooks 26, each hook having `its `lower `end tapered below the hook to provide a camming edge 27. As a `means `for preventing the hooks 26 from sliding along` the rod 25 and to keep them centered on the rod, a sleeve 28 isinterposed between the hooks and is anchored to the rod 25 in any appropriate manner, as by a set screw 29. rlhe material from which the hooks26g` are formed is extended an appreciable distance beyondthe rod 25 to provide counterbalance plates 30, 30, and said plates are clamped together by a through bolt 31 and held `spaced `apart by a sleeve 32 surrounding thebolt 31; The counterbalance thus produced `is possessed of sufficient weight to allow the hooks 26 `to depend substantially vertically, but incident to such counterbalance `the hooksv 26 swing very easily and freely, and to render the counter balance in action efective to the end` of causing the hooks to swing with ease, an adjustable weight is preferably provided for the counterbalance andmay,` assume the form of a bolt 33 threaded into thefsleevev 32 and carrying a nut 34 which is adapted to be threaded inward or outward along the'bolt 33 according to whether the effective weight of the `counterbalance is to be decreased or increased relative to the hooks 26.`

\ Inthe operation of the levers 18 and 23, their pick-up and let-go hooks 26 are adapted tol cooperate with any appropriate work holder having a properly located cross bar Y to receive thehooks and a properly `located camming surface to shift the holder laterally for releasing the hooks, andotherwise a table Qrlike support. The upperend of the bar 35 is formed integral with or otherwise appropriately fixed to a cross bar 39 outstanding laterally on opposite sides of a suspension and camming bar 40 which is formed integral with or otherwise fixed to the bar 35 and located to extend in a directiony fore and aft relative to the bodily travel of the parts: being shifted by the levers 18 and 23. pension bar because, when thework holder islocated in either of the receptacles 11 or 12, the terminals 41 of the bar rest on `the outstanding flange of the respective receptacle while the bar 35 hangspendent in the receptacle; `and the bar 40 is referred to as a camming bar because its end portions beneath the projections 41 are formed with inclined faces 42, 42, located to center the work holder in the respective receptacle when lowered into the same slightly :off center. This centering action is the result; of a camming movement occasionedbyone of the cam faces 42 striking the `curved portion 14 ofthe respective receptacle 11 or 12.`

llt is to be observed that the lengthof each of the levers 18 and 23 is such thatplthe axis of the pivot of hooks 26 extends substantially beyond the vertical axis of the respective l `receptacles 11 and 12 when the levers are in their lowermost positions as seen in full lines in Figure 1, and thespacing The bar 40 is referred to asa sus-` of the shaft 16 laterally of the vertical axis of the receptacle 12 is such that the pivotal axis of hooks 26 of lever 18 lies beyond said vertical axis of receptacle 12 when the lever 18 is swung through approximately one hundred eighty degrees or a little more and brought to a position with the free ends of its varms 19 overhanging the receptacle 12. Hence, when the lever 18 is in a raised position and a work holder is manually or otherwise positioned -in receptacle 11, and the lever 18 then lowered flown over the receptaele, the cross bar will move to a position beyond the vertical planes of cross bar 39 and the camming faces 27 of hooks 26 will strike the cross bar 39 and ride rearwardly thereon until the bite of the hook passes below the line of bar 39, and as soon as this occurs the hook will swing toward the cross bar 39 until the bite of the hook underliangs the cross bar so that, if the lever 18 is then lifted upward, the hooks will come into lifting engagement with the bar 39. It will be observed that the-housing or enclosure 4 will be properly provided with doors and openings for access to various parts, and to this end it is preferable to have the end wall 43 of the housing terminate short of the full length of the housing, that is have its edge spaced sufficiently above the plate 10 of furnace 1 to leave an entrance opening 44 for the successive introduction of the work holders.

The hooks 26 of lever 18 having engaged the work holder, rotation of shaft 6 clockwise will cause the lever 18 to be swung to a position overhanging the receptacle 12. During this movement, the work holder and its work will have remained suspended in a vertical position while relatively travelling through the opening between the arms 19 so that the work holder is lowered into the receptacle 12 in the pendent, vertical position. It will be borne in mind that since the rod 25 is spaced from the axis of movementk of lever 18 suiiciently to lie beyond the rod 39, when the work holder is in receptacle 11, the pivot rod 25 will likewise extend beyond the vertical axis of receptacle l2 at the other side thereof from its location with respect to receptacle 11, and thus as the lever 18 lowers the work holder into receptacle 12, the work holderwill enter the receptacle off-center with respect to the receptacle, and the rear camming edge 42 will thus be caused to engage the curved portion 14 of receptacle 12, and `willcam the work holder laterally, that is, in a direction of the length of the bar 40 until the crossl bar 39 of the work holder reaches a central position with respect to receptacle 12. This shifting movement results in the location of the cross bar 39 nearer the shaft 16 than is the bar 25 when lever 18 is lowered down across receptacle 12. Thus, as thev suspension and camming bar 40 reaches its iinal, seated position on receptacle 2, the hooks 26 of lever 18 being swung out of a vertical line relative to their pivotal axis tend to swing back to that line and a further lowering movement of lever 18, after the seating of the bar 40, releases the hooks 26 from their engagement with bar 39 and allows them to swing to a vertical position entirely free of that bar. Then the lever 18 may be swung back to its former position overhanging receptacle 11 while leaving the deposited work holder in its position suspended in receptacle 12. On the return movement of lever 18, the hooks 26 engage the bar 39 of the newly located work holder which has been introduced while the lever 18 has been depositing the former work holder in receptacle 12.

The action of the pick-up and let-go hooks 26 as thus described is made clear from Figures 4, 5, and 6. In these igures the lever itself has been omitted for the sake of clarity and only the pivot bar 25 illustrated. When lever 18 is lowered across the receptacle 11, the hooks 26, as seen in Figure 4, descend to engagement with and cam across the bar 39, as indicated in dotted lines in Figure 4. Vthen the hook has reached the dotted line position in Figure 4, it is only necessary to elevate it to bring it into lifting engagement with the cross bar 39, and then, when the parts have been swung from receptacle 11 to receptacle l2, the suspension and camming bar 4() is cammed to a centering position as indicated in Figure 5, as the work holder is being lowered into the receptacle 12, and when bar 40 has become centered, the hooks 26 will have moved from the full line position of Figure 5 to the dotted line position thereof, so that a further lowering movement of the cross bar 25 and the parts which carry it will cause the hook 26 to clear the cross bar 39 so that the hooks 26 move from the dotted line position of Figure 6 to the full line position thereof,for approximately so, and the hooks are then entirely free to be lifted without danger of engagement with cross bar 39.

The action of the hooks 26 of lever 23 is identically that just described except that the work holder is picked up from the receptacle 12 and deposited in the tray 45 in quenching vat 3, and while the release of the hooks is accomplished in identically the same manner as that just described, the apparatus arranged within the tray 45 to receive the work holder is slightly different from the receptaclesll and 12, and such apparatus is seen in detail in Figures 7 8, and 9. It is, of course, obvious that practically identically the same type and arrangement of receptacle might be provided within vat 3, or at least a support having the same marginal arrangement, and an operating lever `identical with levers 18` and 23 might well be used for picking the Work holder up out of the quench and depositing it on the table 7, but because the plant is `intended for and adapted to conversion for discharging `the work holder. The Vtray is a reticulated basketfixed to a rockshaft 46 extending laterally beyond the housing to appropriate operatingmechanism, such as illustrated and described in my abovementioned patent and pending applications. The opposite edge of the tray 45 from that supported bythe shaft 46 is preferably provided with a bracket or brackets 47 adapted tooverhang and engagea Vrail or like support 48 forming part of the vat 3g or the framing thereof.

Therefore, to `enable the tray 45 to "serve, as the receiver and discharging means forV the work holder to and from thevat 3, a cradle or pivotally mounted framework is y carried by the tray and located to receive and cooperatewith the work holder delivered by lever 23 andits hooks 26 exactlyl as receptacle 12 cooperates with and receives the work lholder from lever 18and its hooks 26. That frame or cradle, as clearly seen in Figures 7, 8, and 9, `consist essentially of longitudinal bars 49, 49, and cross bars 50, 50, connecting the bars 49. The bars 50 may be merely in the form of bolts or rods, while the bars 49 are preferably angle bars and from the horizontal web of each bar at acentral point thereof there depends a weight 51 preferably carriedbya rod or bolt 52 anchored to the respective'angle bar. Outstandinglaterally, from each of said angle bars midway of the length thereof is a bracket 53, asbest seen in Figures 7 and 8, each of which brackets is bifurcated at its free, downturned end portion to provide a fork 54 adapted to engage and extend on opposite sides of a pivot pin 55, there being a pivot pin 55 fixed to and extending inwardly from each side of tray 45. Obviously, the pins 53 may be provided in any appropriate manner, but preferably consist of bolts extending through the marginal portions `of the tray 45 and engaged at their outer ends by nuts 56, as best seen in Figure 10. Each bolt is shouldered at the in` ner face of the tray so that `the nut 56 may effectively clamp the bolt in place and leave an inwardly-extending pivot finger. Ob-

viously,`by backing oif the nut 56 the part 55 in each instance may be `readily removed to leave the tray free of obstruction when the plant is transformed for thehandling of small articles.

Thus it will be seen that `the framework made upA of parts 49 and 50will lie constantly in a horizontal positionowing to the action of theweights 51 and the fact that` the `parts are pivotally mounted on the iingers .55, and this position is maintained not#- withstanding the swinging of the tray 45 to and from the dotted line position seen in Figure 1.` Each rod 50 is formed preferably midvvay of its length with a depression 57 located to receive the suspension and cam ming bar 40 and to center the work holder lowered into engagement with said depressions 57. Inother words, the bars 50 are in that relation to the pivot of lever 23 and the pivotrod 25 of lever 23 that, when lever 23 is lowered above the tray 45, the camming face 42 at the rear end of bar 40 will strike `the rear rod 50 and cam the work holder to a .centering position forward of itslocation at the time of its being lowered by the hooks 26, so that the hooks 26 are swung `to an inclined position such as indicated in dotted lines in Figure 6, and the further lowering of the lever 23, therefore, frees the hooks from the cross bar 39 and allows the lever 23 to return to its former position While leaving the work holder suspended on the cradle. l y y Y W'hen thework holder has thus been deposited in the `tray 45, andthe chilling action has been completed, the shaft 46 is `oscillated `toswing the tray 45 to the dotted line position of Figure 1, in which position the work holder will rest on its `feet on the table" 7, and further lowering of the tray will allow the cradle to move sufficiently `below the bar 40.to allow the work holder to be readily manually removed. By preference, al' part of the housing 4 includes a door 58 pivoted at 59 `and `connected pivotally by a link 60 to a` part of the frame of tray 45, so that the door will open in advance ofa discharging movement of the tray and will follow the tray and close as thel tray returns to its position in vat 3.

It will thus be seen that the only manual effort required is the lowering of the work holder into receptacle 11 and the removal of the work holder from the table 7,` and it should be apparent that even these manual operations could be easily disposed of `where desired by merely providing take-up and let-go levers and hooks in advance and in the rear of the plant corresponding to the lever 18 and hooks 26; but for most practical purposes it has been found preferable to load the work holder manually and then deposit the work holder manually to start ess of,V the plant.

the proc-.

It should also be observed that the whole process is one of heat treatment, that iny receptacle 11 being preheating, that in receptacle 12 being further heating and further treating as by carbonizing through the action of a cyanide bath or the like, and that in the vat 3 being heat treating inthe sense of quick heat exhaustion or quick lowering of temperature, and to avoid a negative viewpoint of the action in vat 3, it is believed correct to describe the action as heat treatment, being merely a downward heat treatment instead oit' an upward heat treatment.

While the invention is in no sense limited to any particular mounting of work on the work holder or any particular form of the work holder, it is nevertheless a fact that for certain work, such as work made up of circular bodies having openings therethrough, including gears and the like, it is desirable to suspend them on arms, such as the arms 36, and to prevent possibility ot parts of work moving or undesirably sliding toward each other when suspended on the same arm, I prefer to provide serrations or tooth-like projections 61 on the upper edge of the arms 36, as seen in detail in Figure 12. Also, at the outer end of each arm an upstanding inger G2 is a convenient arrangement to prevent the work accidentally slipping ofi' of the arm.

While the present invention is especially' well adapted for the treatment ot' articles of metal work for case-hardening or like tempering, it is not necessarily limited to any such apparatus and is wellv adapted Jfor any of numerous forms of heat treatment of work articles for known and desirable results.

lVhat is claimed is l. In heat treating apparatus, the combination, with means providing a plurality of places of heat treatment, of work holder positioning means at each of said places, and piek-up means cooperative :with said` work holder positioning means `for bodily movmg a work holder from one place of heat treatment and at another place of heat treatment depositing and releasing thel work holder from the piek-up means.

2. In heat treating apparatus, thevcombination, with means providing a plurality' of places of heat treatment, of woik holder positioning means at each of said places, and pick-up means cooperative with said work holder positioning means for bodily moving a work holder from one place of heat treatment through an arc to and at another place of heat treatment depositing and releasing the work holder from the pick-up means.

3. In heat treating apparatus, the combination, with means providing a plurality of places of heat treatment, of work holder positioning means at each of said places, and piek-up means cooperative with said work holder positioning means for-bodily moving a vwork holder from one place of heat treatment through a vertical arc to and at another place of heat treatment depositing and releasing the work holder from the pick-up means.

4. In heat treating apparatus, the combination, with means providing a plurality of places of heat treatment, of work holder positioning means at each of said places, and pick-up means cooperative with said work holder positioning means for bodily moving a work holder upward out of one place of heat treatment and out of contact with supporting means other vthan said pick-up means and for moving the work holder to and lowering it into another place of heat treatment, and depositing and releasing the work holder at the second-mentioned place tree of said piek-up means.V

5. In heat treating apparatus, the combinatioinwith means providing a plurality oi places of heat treatment, of work holder positioning means at each of said places, work holder carry ng means mounted to reciprocate l? t *een the places of heat treatment, and means on the work holder carrying means cooperative with said work holder positioninf` means for automatically picking up work holder at one of the places of heat treatment and for automatically releasing the work holder at the other.

6. In heat treating apparatus, the combination, with means for providing a plurality of places ort heat treatment, of work holder carrying means mounted to move between the places of heat treatment, a hook comprised in said carrying means being pivotally dependent from a part thereof and located with itspivotvdisposed with relation tothe places oi. heat treatment to extend at one side of the place of engagement of the hook with a work holder for causing the hook to engage and release the work holder for automatically lifting the work holder from one place of heat' treatment and depositing and releasing it at another.

7. AIn heat treating apparatus, the combination, with means providing a plurality of places of heat treatment, of work holder carrying means mounted to move between the places of heat treatment, a hook comprised in said carrying means being pivotally dependent from a part thereof and located with its pivot disposed with relation to the places of heat treatment to extend at one side oi the place of engagement of the hook with a work holder for causing the hook to engage and release the work holder for automatically lifting the woi'k holder from one place of heat treatment and depositing and releasing it at another, and means for automatically shitting the work holder relative to the pivot ot saidhook for eifecting releasing movement of the hook.

`ally dependent from a part thereof and located with its pivot disposed with relation to the places of heat treatment to extend at one side of the place of engagement of the hook with a work holder for causing the hook to engage and release the work holder for automatically lifting the work holder from the place of heat treatment and depositing and releasing it at another, and gravity-actuated means for shifting the work holder relative to the pivot of said hook for effecting releasing movement of the hook. i

9. The combination, with means providing` a plurality of places of heat treatment, of an operating lever for shifting work from one place of heat treatment to another, a hook pivotally carried by said lever and pendent therefrom, the pivot of said hook being located to lie beyond a predetermined point of one of the places of heat treatment when the lever is moved to overhang such place of heat treatment and to lie at the relatively opposite side beyond a corresponding point of the other place of heat treatmentwhen the lever overhangs the latter place, a work holder adapted to be engaged by said hook in the line of said predetermined point of the first-mentioned place of heat treatment, and means for shifting the work holder to the said predetermined point of the second place of heat treatment on being delivered at said second place of heat treatment by said lever and hook, whereby the place of engagement between the lever and hook at the second place of heat treatment is shifted out of alinement with the pivot of the hook for releasing the hook and allowing the work holder to be deposited and released at the second place of heat treatment.

, 10. The combination, with means provid-` ing a plurality of places of heat treatment,

0` lever for shift-ing work from of an operatin one place of heat `treatment to another', a

\ tively opposite side beyond a corresponding point of the other place of heat treatment when the lever overhangs the latter place, a work holder adapted to be engaged by said hook in the line of said predetermined point of the first-mentioned place of heat treatment, means for shifting the work holder to the said predetermined point of the second place of heat treatment on being delivered at said second place of heat treatment by said lever and hook, whereby the `place of engagement between the lever and y hook at `the second place of heat treatment is shifted ont of alinement with the pivot of thehook for releasingthe hook and allow-` ing the work holder to be deposited and releasedat the second place of heat treatment,

anda c'onnterbalance for thehook for facilitating swinging thereof to a `released position:

1l. The combination, with means providing a plurality of places of heat treatment, of an operating lever for shifting work from one place of heat treatment to another, a hook `pivotally carried by said lever and pendant therefrwom, the pivotof said hook being located to lie beyond `a predetermined point of one of the placesof heat treatment when the lever is movedto overhang such place of heat treatment and to lie at the relatively opposite side beyond a corresponding point of the other place of heat treatment when the lever overhangs the latter place, a work holder adapted to be engaged by said hook in the line of said predetermined point` of the first-mentioned place of heat treatment, means for shifting the work holder to the said predetermined point of the second `placeof heat treatment on being delivered at `said second placeuof heat treatment by said lever and hook, whereby the place of engagement-between the `leveraird `hook at the second place of heat treatment is shifted ont of alinement with-the pivot ofthe hook for releasing the hook and allowing the work holder to be deposited and released at the second place of heat treatment, and means to swing the hook to a released position.

12. The combination, with means providing a plurality of places of heat treatment, of a work holder having a camming surface adapted to cooperate with the parts at said places of heat treatment for centering itself relative thereto, a hook receiving member carried by the work holder, an operating lever swinging between the places of heat treatment, a hook pivoted to and pendent from Said lever in position for having the axis of the pivot of the hook at one side of the place of the hook-receiving means when the work holder is centered, the location of the pivot of the hook being such relative to the second place of heat treatment as to extend at that side and beyond the hook-engaging means of the work holder at which the hook opens for causing the hook to assume an inclined position as the work holder is cammed to a centering position, whereby lowering of the hook will cause gravity movement thereof laterally of the hook-engaging means of the work holder and thus release the hook from engagement.`

llO

13. The combination, With means providing a plurality of places of heat treatment, and a work holder adapted to cooperate therewith, of a lever pivoted to swing from a position overlying one of the places o'f heat treatment to a position overlying the other, Said lever being bifurcated and provided with an opening of a size sufficient to aecommodate the passage of the Work holder, a hook pivotally carried by the lever adj aeent the free ends thereof adapted to engage the Work holder ior moving the same from one place of heat treatment to the other, and means for shifting the Work holder on reaehing the second place of heat treatment for releasing the engagement of the hook.

14. In heat treating apparatus, the combination of means providing a plurality of places of heat treatment, means for shifting a Work holder from one place' of' heat treatment to another place of heat treatment, a pivotally mounted cradle at the last-mentioned plane of heat treatment for receiving and sustaining the Work holder in a vertical position, and means for .swinging the cradle from the place of heat treatment to a discharge position While maintaining the same With the Work holder in a vertical position.

15. In apparatus of the class described, the combination, with a discharge tray for heat treated Work, of a cradle pivoted thereto and eounterbalaneed to maintain a horizontal position, said tray having means for D receiving and sustaining a Work holder in a vertical, suspended position.

In testimony whereof I aix my signature.

HEYMAN ROSENBERG,

Images