US1412152A - Hardening and annealing furnace - Google Patents

Description

B. M'. wALPoLE.

HARDENING AND ANNEAL|NG FURNACE.

- APlLlcATloN FILED AHL-15.1919.

Patented Apr; 11, 1922.

` i To all whom 'it may Concern .f

, .UNira srras BENJAMIN M. WALPOLE, or PROVIDENCE,antonin'1snANn11assrGNoR-To; NA'JJIONAl T'Be it known thatI, BENJAMIN WAL- frjoiin, a citizen of the United States.V and resident of. theV city of Providence', in the county of Providence .and State of Rhode Island', lhave invented certain'new. and useful Improvements in Hardening and Annealing Furnaces, ofwhich the following is a specification.

. This invention relates to furnaces adapted Vmore `particularly for 'annealing and hardeningmetal' parts, and has for one otits objects to provide a furnace in'which the heatV zone is sealed against the entrance ofoutside `air 'fwhile the work is beingV acted upon therein to 'prevent oxidization of the material'.' i

A further' object of' the invention is to provide a i combustion chamber aboutY the heat zone and separated from thel zone to prevent direct contact of the blaze with the workjwhen gas is` used as a fuel 'thereby ,obtaining a more uniform heating effect "upOn the workand also preventing oxidizing of the same'while being treated. A further object oftheinvention is to j provide AaY rotatable carrier in. which a v plurality ot spaced-apart work supporting sof members are mounted, said members being independent of each other.

:1 -With these 'and other objects in: view, the V'invention consists of certain novel features of construction, as will be more; fully described,v and particularlyy pointed'out inl the appended claims.

Inthe accompanying drawings:l Figure 1 is a sectional side elevation showingl the general. arrangement ofV Vin y `Aimproved furn'ace.` l f Figure 2 is a central sectional end elevation ofthe same.

'Figure 3 is a sectional View showing-a portion'of a Vcarrier havingfmeans' whereby.

the work is automatically ejected from the holder after'it has ybeen acted upon in the heat zone. I

Referring to the drawings, l0V designates the oven portion which may be formed of brick or other suitable heat-resisting ma- A partition 13 is formed in said Ychamber 'z2-2 as desired.

y eAsrURNACEooMrANY or..PnovrnnncngnrronnsLAND, A CORPORATION or @RHODEISLAND.V v v ff l -HARDENING ANDANNEALING FURNAQE.

This-oven Yand its partition are mounted onatable-Bi and Vsupportedon suitable legsl.

Specica'tionof Letters Patent: .133te11fed-pr 11, 1922., Application' leiap'rii 15,19'1'95'v`'serialY Nofzeaiiaf' i 1 "A carrier member lis rotatablymounted A oni the Yshaft v17 which issupported on bearings 18 from the table and this wheel yis.A

adapted to be-rotated through they worm 20, shaft21, and hand wheel wheel V19, worm .This carrier is Vc'o'nstructed essentiallyfin the form' of apair 0f spaced-apart Wheels eachyhavingr a plurality l of loppositely disposed arms 23V radiating outwardly from'the v hub members 2,6,v and between.:whicharms`V the work .supports 24 are pivotally mounted, eaCli on itspivotingrod 25, which work supports mayV be made in the'formzof baskets lor receptaclesas illustrated in Figures -1 and 2, o'r in the Vform of'sockets 29 as illustratedin Figure 3, or in any other desired form. I

In arranging these j work supports about the wheel, I- preferably form them in groups :and separate` eaclrgroup from the neXtad- 'jacent group, and between Vthese different groups I :provide abaiiie plate 27tmou`ntedvr on the wheel hubs and vwhich-plates. are arranged to enter the heat zone and close both ends thereof to prevent circulationfrom the 7 outer chamber .or gas zone 30', zpresently described, during'the vwork heating period and so 'more effectually confine Ythe`heatjwithin f l y ai liquid bath tank 2811s pfrdedthfough which VYthe work supports and-the work are vpassed to coolthe same,.after the latter has :been subjected to the-high temperature in thehe'ated'zone.' One ofV he features ofthis invention is that athin Wall-.or platef33 is arranged to Vproject' downwardly from` `the Atable 34 land Afill this outer chamber withsuitable nonterial, and within which is formed a. comv oxidizing gases through the pipe 40 tomore efi'ectually exclude the oxygen of the Vair and so ei'lectually prevent oXidization ofthe Cil hand of the operator down and deposited into the receptacles and after having been annealed they are removed from the baskets by handat the other side of thema'chine.

By my improved construction of furnace the carrier proper is not subjected to action of the high temperature as it is effectively protected. by the skirt 33' and double 'bands 3l and 32 of suitable heat-resisting material which are disposed about the hubs 26.

By my improved construction each of the work supports is entirely independent of the other supports in this carrier, in that if one is displaced or out of order, it in no way affects the operation of the others; then again the work support itself is extremely simple in construction and is readily removedfrom the carrier and replaced by another.

The heated Zone may be elongated to re.- ceive work of any length.

In some instances it is desired to provide means for automatically discharging the work from the holders, and in Figure 3 I have illustrated one means of accomplishing this result which comprises a wheel 35 on which are mounted a plurality of spokes 36 on which spokes are pivotally mounted at 37 the holders 29 into which the work 38 such as drills or short rods, may be placed where` by'when the work holders pass the vertical line in the heat zone they will automatically tip and swing downwardly into position to discharge the work therefrom.

rIhis automatic operation, as illustrated, is but 'one of a number of ways in which this or similar result may be accomplished.

In the operation of myimproved anneal- V ing and hardening apparatus the work is placed byhand into a pair of receptacles Q4 then the device is rotated by means of the hand wheel 22 tov bring this pair of hollow receptacles up intoV the heat Zone. After the work has kbecome thoroughly heatedl in this Zone the hand wheel 22 is again operated to bring the ywork from the heat rzone down into l the liquid on the other side from whence it is removed by the hand of the operator.

rI`he foregoing description is directed solely towards the construction illustrated, but I desire it to be understood that I reserve the privilege of resorting to all the mechanical changesto which the device is susceptible, the invention being defined and limited only by the terms of the appended claims.

I claim: f Y

l. An annealing and hardeningfurnace comprising a rotary work carrier, a liquid tank, a heat zone above said tank and a skirt extendingydownwardly into the tank liquid sealing said heat zone against the admission of outer air. l i

2. An annealing and hardening furnace comprising a revolving carrier, work supports mounted on said carrier, ai'heated Zone into which the work supports yare moved by the rotation of said carrier, a liquid `tank into which the work is immersed and a set of battle plates mounted on'the carrier for closing the heat zone after the work has been admitted thereto. y

8. An annealing and hardening furnace Ycomprising a revolving carrier, a plurality of spaced apart work supports arranged, around and mounted on said carrier, all mounted to rotate about a common center, a combustion chamber, a heat zone into which the work is carried by said carrier, a cooling liquid into which the work is immersed, a partition between said chamber and'zone excluding the atmosphere from said zone while the work is being acted upon therein.

4. An annealing and hardening .furnace comprising a revolving carrier, a plurality of work supports pivotally mounted in spaced relation in said carrier to swing inL dependently of each other, a heat zone, and means whereby said carrier may be rotated to advance said supports and the work into said zone and then moved out of said Zone after having been raised to a predetermined temperature. y

5. An annealing and hardening furnace comprising a heat zone, a work carrier for advancing the work into said Zone, and a holder for the work on said carrier adapted to be positioned by gravity to discharge the 'work therefrom at a predetermined point in the travel of said carrier.

6. An annealing and hardening furnace comprising a heat zone, a set of movable work supports for carrying the work into said Zone, said supports being mounted to be positioned by gravity to eject the Work after it has been acted upon in the heat zone.

In testimony whereof I aiiix my signature.

BENJAMIN M. WALPOLE.

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