US2322305A - Heat treating apparatus - Google Patents

Description

june 22, 143. MCGUIRE, JR 2,322,395

HEAT TREATING APPARATUS Filed Jun e' 15, 1940 I 6 Sheets-Sheet l 1 INVENTOR '52 FRANK MGGLJIREJR.

ATTORNEY June 22, 1943. MCGUIRE, JR

HEAT TREATING APPARATUS Filed June 15, 1940 6 Sheets-PSheet 2 lmw INVENTOR FRANK McGUlRE,JR.

ATTORNEY F. MCGUIRE, JR 2,322,305 1 June 22, 1943.

HEAT TREATING APPARATUS 6 Sheets-Sheet 3 Filed June 15; 1940 INVENTOR ATTORNEY FRANK Mc GUIRE,JR

June 22, 1943. F. M GUIRE, JR

HEAT TREATING APPARATUS Filed June 15, 1940 6 Sheets-Sheet 4 R E m Rw a 0 N M m m FYA w m w June 22, 1943. F, MCGUIRE, JR, 2,322,305

A HEAT TREATING APPARATUS Filed June 15, 1940 j 6 Sheets-Sheet 5 INVENTOR FRANK MCGU|RE,JR.

ATTORNEY June 22, 1943.

F. M GUIRE, JR

HEAT TREATING APPARATUS Filed June 15, 1940 6 Sheets-Sheet 6 INVENTOR ATTORNEY surface.

Patented June 22, 1943 HEAT TREATING APPARATUS Frank McGuire, Jr., Bogota, N. J., assignor to The Linde Air Products Company, a corporation of Ohio Application June 15, 1940, Serial No. 340,645 12 Claims. (Cl. 266-) This invention relates to heat treating apparatus useful for locally hardening surface portions of metal bodies, such as gear teeth, and more particularly to apparatus which includes a device for accurately positioning a pair of blowpipe heads in operative relation with respect to a gear tooth.

A particularly effective manner of locally hardening a surface of a metal body, such as a side or wearing surface of a gear tooth, consists in applying high temperature heating flames followed by cooling jets against successive portions of the It is particularly desirable to harden both sides or wearing surfaces of a gear tooth simultaneously, to avoid the possibility of reheating a previously hardened surface, and. also to obviate the possibility of causing warpage due to local expansion and contraction of one side only of the tooth. To secure the maximum benefits from hardening both sides of the tooth simultaneously, it is desirable to position the heating flames, and also the cooling jets, exactly opposite each other on opposite sides of the tooth. It is also desirable that the flames on each side of the tooth impinge upon the tooth surface at the same angle; and that the blowpipe heads, from which the heating flames and cooling jets normally are discharged, be spaced the same distance from each tooth surface. On the one hand, it is necessary that the blowpipe heads be positioned with extreme accuracy, but, on the other hand, too much time should not betaken to position the heads, because the apparatus lies idle during positioning and the cost of treatment is thereby increased.

In accordance with previous practices, a drill is inserted in each blowpipe head, in one of the outlets from which the heating flames are dischargedin order to adjustthe distance between each head from the tooth, to determine the points at which the flames will impinge upon the tooth surface, and to determine the angle of impingement of the heating flames and cooling jets. Insertion and reinsertion of a drill in a heating flame outlet tends to mar the outlet and there'- by lower the efficiency of the head, since an irregularity in an outlet tends to cause the heating flame discharged from that outlet to burn improperly, thus tending to produce backfires and flashbacks. Moreover, such a method of, positioning the heads requires considerable time, and only a highly skilled operator can position the heads with the highest degree of accuracy. Also, the correct set-up for a particular type and size of tooth cannot be duplicated at some later time without repeating the entire setting-up operation.

Among the objects of this invention are to provide apparatus for heat treating gear teeth which include a novel positioning device by which a pair of blowpipe heads may easily be adjusted to any predetermined position relatively to a gear tooth; to provide such a positioning device by which the heads may be assembled accurately in v I position at a work bench or any other convenient place, and the heads then attached to the remainder of the apparatus with assurance that the heads will be'in accurate position relatively to the gear tooth to be treated; to provide such a positioning device which will hold the heads accurately in position during treatment of a gear tooth; to provide heat treating apparatus in which the pressure of quenching liquid is maintained constant; to provide such apparatus by which a pair of blowpip heads may be supplied with a combustible mixture of gases from a single blowpipe and also may be supplied with a quenching medium from a single source thereof; and to provide apparatus for heat treating gear teeth by which a pair of blowpipe heads may be supported for universal movement in a plane. Other objects and novel features of this invention will become apparent from the following description and accompanying drawings, in which:

Fig. 1 is an end elevation of apparatu constructed in accordance with this'invention, in which a pair of blowpipe heads are held by a v novel positioning device in inoperative relation with respect to a tooth of a gear;

Fig. 2 is a perspective view, looking downwardly at a small angle, illustrating more particularly the positioning device and attached blowpipe heads of Fig. 1;

Fig. 3 is a rear elevation of the positioning device and blowpipe heads of Fig. 1;

Fig. 4 is a rear elevation of an altemative structed in accordance with this invention for supporting a pair of blowpipe heads for universal movement in a plane, and by which the blowpipe heads may be supplied with a. combustible mixture of gases from a single blowpipe and a cooling medium from a single source;

Fig. 9 is a horizontal sectional. view, looking downwardly along line -8 of Fig. 8;

'Fig. 10 is a vertical sectional view taken along line l0ll of Fig. 8, and showing more particularly a manifold which forms a portion of the apparatus illustrated in Fig. 8;

Figs. v11, 12, and 13 are vertical sectional views taken along lines l|l|, |2-l2, and l3-l3, respectively, of Fig. 10;

Fig. 14 is a longitudinal sectional view illustrating a header which forms a portion of the apparatus of Fig. 8; I

Fig. 15 is a front elevation of the header of Fig. 14, partly broken away to show the interior construction;

Fig. 16 is a vertical sectional view taken along line I6-l6 of Fig. 15; A

Figs. 17 and 18 are longitudinal sectional views of the right hand blowpipe head of Fig. 3, taken along lines l'|-'-i1 and iii-I8, respectively;

Fig. 19 is an end elevation, partly broken away. on an enlarged scale, of the blowpipe heads of Fig. 1 and a modified form of positioning device through which a cooling medium may be circulated;

Fig. 20 is a transverse sectional view taken along line 20-20 of Fig. 19;

Fig. 21 is a side view of the right hand blow pipe head of Fig. 6; and

Figs. 22 and 23 are longitudinal sectional views slide 1 by a bolt II,

and arm 10 is slotted, so that a slotted vertical arm I2 is movable along arm l0, and may be secured thereto in any desired position by a bolt I! which extends through the slot in arm l0. A slide I4, to which blowpipe B is secured by a clamp I5, is similarly adjustable along horizontal arm 10. A slide ii, to which blowpipe B i secured by a clamp I1, is. movable vertically along arm i2. Slides I4 and I6 respectively may be secured in any desired vertical or horizontal position by bolts similar to bolt l3 and which extend through the slots in arms i0 and I2, respectively. Thesupport S.

Ithrough slides i4 and liand clamp l5 and ll,

taken along lines 2222 and 23-23, respectively,

of Fig. 21.

The apparatus illustrated in Figs. 1-3 comprises, in general, a pair of blowpipesB and B mounted on a support S, in turn mounted on a carriage C; a pair of heating heads H and H clamped in a positioning device D and supplied with a combustible mixture of gases by blowpipes B and B; and a quenching medium supply Q, which supplies heads'H and H with a quenching medium at substantially constant pressure. The heads H and H, as in Fig. 1, are in operative position for hardening oppositely disposed wearing surfaces of a tooth T of a gear G. Gear G of Figs. 1 and 2 has relatively small teeth, and there is thus insuilicient room between two teeth for a head to enter completely. Heads H and H are therefore so constructed'that the heating flames and cooling jets are discharged against permit vertical and radial adjustment of blowpipe piDe'B'.

The support S herein illustrated is similar to that disclosed in the application of Roger 0. Day, Serial No. 169,373, filed October 16, 1937, now U. S. Patent No. 2,224,006 but other supports may be used, such as that disclosed in the application of Roger B. White, Serial No. 169,379, filed October 16, 1937, now U. S. Patent No. 2,224,007.

Blowpipes B and B are each supplied with a combustion supporting gas, such as oxygen, and a combustible gas, such as acetylene. bustible mixture of these gases is formed within the blowpipes, the proportions of the combustible mixtures being adjusted by regulating valves l8. From the forward end of each blowpipe, as in Fig. 2, the combustible mixture passes through a tube iii to the upper end of a header 20. From the lower end of each header, the combustible mixture passes through a tube 2! to head H or H. Tubes 19 and 2| are provided with unions 22 and 23, respectively, so that heads H and H may be adjusted to any desired position. Heads H and H are preferably secured in positioning device D at a workbench or any other convenient place, headers 20 being moved to the necessary positions when the heads H and H The quenching medium supply means Q includes a manifold 24 having at one end an inlet the tooth surfaces from the lower end of each head, rather than from the side of each head, which is possible when larger gear teeth are being treated and the heads can be positioned between the teeth, as in Fig. 6. For moving the heads along the tooth, or downwardly in Fig. 2, carriage C runs along a flanged track T, which is preferably positioned with the flanges parallel to the center line of the tooth being treated, so

that the heads H and H will traverse a path which is parallel to the sides of the tooth. Carriage C is constructed as disclosed in U. S. Patent No. 2,183,605, being a four wheeled self-propelled mechanism. but it will be understood that any other suitable traversing mechanism or carriage may be utilized.

Carriage C is provided with a slide4 adjustable laterally by a hand wheel 5, while a vertical uide 6 is secured to the end of slide 4. A slide 1, which fits into vertical grooves in guide 6, is moved upwardly or downwardly by a screw 8 which may be turned by a hand wheel 9. A

25 through which a cooling medium, such as water, is supplied. Leading from the. side of the manifold are a pair of tubes 26, which conduct the cooling medium to heads H and H. Tubes 26 are preferably relatively flexible, so that each tube may easily be connected to head H or H irrespective of the position in which the heads are placed. Leading from the end of the manifold. opposite inlet 25, is a vertical pipe 21 provided witha Valve 28; The upper end of vertical pipe 21 is provided with a packing gland 29 which surrounds an overflow pipe 30, which may be moved upwardly and downwardly to any desired vertical position. The pressure of water through inlet 25 is preferably adjusted so that a small amount of water flows continuously from the open upper end of pipe 30. When the horizontal arm I0 01' support S is attached to pressure of the cooling medium in manifold 24 exceeds a predetermined value, excess cooling medium will flow out of the open upper. end of overflow pipe 30. Thus, the pressure of cooling medium supplied to heads H and H will remain essentially constant, and the pressure of cooling medium supplied to each head will be the same. In addition, if the flow or water through the open upper end of pipe 30 ceases, this will indicate a lack of sumcient pressure, and serves as a warning to the operator that theheads may A com-' become overheated, or the-heated surface portions may be insufficiently quenched. If it is not desired tensebverflow pipe 30 to regulate the pressure of cooling medium, valve 28 may be closed.

The positioning device D, as in Figs. 1-3, includes a pair of arms 3| and 32 which are pivotal about a common center. are symmetrical, i. e., they are similar in shape but reversed in configuration, and the upper end of each arm is formed as a relatively narrow cylindrical segment 33 or 34. Cylindrical segments 33 and 34 are interfitting and have equal radii, the arms being pivotal about a stud 35 which extends rearwardly from the center of cylindrical segment 34 and passes through an aperture in a leveling plate 36 and thence through an aperture in the center of cylindrical segment 33. Arms 3| and 32, which are thus pivotal about the centers of cylindrical'segments 33 and 34 as a common center, may be secured in any desired radial position with respect to each other and/or plate 36 by tightening a wing nut 31 on stud 35. The lower ends of arms 3| and 32 are provided with wide, deep slots 38 and 39 in which heads H and H may be secured by clamping plates 40 pressed against the heads by wing bolts 4|.

In order that any given set-up may be duplicated readily, the positioning device D, and preferably also heads H and H, are provided with means for indicating the radial positions of arms 3| and 32 and the longitudinal position of heads H and H relative to the arms. In addition, at the upper end of plate 36 i a, leveling surface 42, with a U notch 43 formed centrally thereof and extending down to the periphery of cylindrical segments 33 and 34. In the bottom of notch 43 is an indicating mark 44 which cooperates With scales 45 and 46 in setting arms 3| and 32 in any predetermined radial position about their common center. Scales 45 and 46 are preferably graduated in degrees and may be stamped or etched around the periphery of cylindrical segments'33 and 34, respectively, or stamped on metal strips which are aflixed to the periphery of the cylindrical segments by rivets. Scale 45 is stamped on, or aflixed to, the periphery of cylindrical segment 33, and scale 46 is stamped on, or aifixed to cylindrical segment 34, but reads in the opposite direction from scale 45. Consequently, arms 3| and 32 may be placed in identical positions about their common center, 'or at identical angles with respect to leveling surface 42,'or a. perpendicular thereto, merely by aligning identical marks on scales 4'5 and 46 with indicating mark 44. For instance, as illustrated in Fig. 2, each arm is set at an angle of 50 with respect to leveling surface 42, or at an angle of 40 with respect to a perpendicular to the leveling surface.

Each arm 3| or 32 is also provided with an indicating mark 41 adjoining slot 38 or 39, each mark being spaced the same:- distance from the edge of thearm. To cooperate with mark 41, a suitable scale 48, preferably reading in. inches or increments thereof, is stamped or etched on each head, as in Fig. 3. identical marks on each scale 48 with indicating marks 41, heads H and H" may be placed in exactly corresponding positions in slots 38 and 39.

Any particular setting of the blowpipe heads H and H, or other heads adapted to be used in connection with the positioning device, may be easily and quickly repeated once the correct position has been determined for any particular gear tooth. Assuming that the angular setting Arms 3| and 32 I gt arms 3| and 32 and the proper position of eads H and H in slots 38 and 39 are known, the positioning deviceand the heads aretaken to a workbench-or other suitable place, where they may be assembled easily and quickly. After the proper marks on scales 45 and 46, indicating the same number of degrees, are aligned with indicating mark 44, arms 3| and 32 are clamped in the proper radial position by tightening wing nut 31. Then heads H and H are secured in slots 38 and 33 by tightening wing bolt's4l, the same distance mark on each scale 48 being aligned with indicating mark 41. The assembled positioning device and heads are then taken to the work set-up and the heads H and H connected to unions 23, blowm'pes Band B having been placed in parallel relationship by proper adjustment of vertical arm l2 and slides I4 and I6. Before unions 22 and 23 or clamps l5 and H are tightened, a level is placed on surface 42 and heads 20 or blowpfpes B and B twisted so that surface 42 is exactly level. This will' place the centerof stud 35 and indicating mark 44 in vertical alignment. In addition,

- blowpipe B or B may be moved forwardly or backwardly in clamp |5 or l1, as necessary, so

that each head will be the same distance from arm I0, which is positioned at right angles to the centerv line of a shaft 49, upon which gear G is, mounted, and consequently also at right I angles to the center line of tooth T. Clamps l5 and I1 and unions 22 and 23 may then be tightened, and tubes 26 attached to the heads.

The gear G is supported so that the center line of tooth T is vertical, and the entire assembly of support, blowpipes, heads and positioning device are then moved laterally, if necessary, by moving laterally adjustable slide 4, so that the centers of stud 35 and indicating mark 44 are in exact vertical alignment with the center line of tooth T. (This is relatively easily done, for the center line of shaft. 49 is also in vertical alignment with the center line of tooth T.) Then the entire assembly, if necessary, is raised or lowered by adjusting the vertical position of tooth merely by adjusting the positioning device Merely by aligning V coincide with indicating marks 44 and 41.

and the heads clamped therein to positions in which the proper marks on scales 45, 46, and 48 In repositioning'the heads,"it is normally unnecessary to'change the position of slides I4 and It or loosen clamps l1, since a slight rotation of headers 20 will take care of any difierence in the distance between the heads for a different tooth. The only other adjustment which probably will be necessary will be a vertical adjustment of the entire assembly to place surface 42 the proper distance above the top of tooth T. In connection with the use of the. positioning device of this invention, it is desirable to provide tables indicating the proper angular setting of arms 3| and 32 and the proper setting of heads H and H'in slots 38 and 39, as well as the proper distance of surface 42 above the top of the tooth,

for each size and typ of tooth to be treated.

The positioning device D of Figs. 1 to 3 may remain attached tothe heads H and H, since the teeth being treated are relatively small and. the heatv to which the positioning device is exposed will normally not be sumcient to damage the same. However,'if desired, acooling medium may be. circulated through the positioning device, particularly through the lower ends of arms II and 22. As shown in Figs. 19 and 20, arms II and. 22f arehollow but otherwise's'imilar to arms 8| and 32 of Figs. 1 to 3, so that a suitable cooling medium may be circulated, therethrough from inlets I to outlets IOI.

' The positioning device D of'Figs. 4-7 is similar to the positioning device D just described,

' but, includes means for adjusting the relative 7 height of the positioning device and heads with respect to the top of a gear tooth and rotatable clamps at the lower end of the pivoted arms by whicli'bther types of heads may be accurately positioned. Thus, the positioning device D includes a pair of symmetrical arms -5I and 52 turiinal heating passage I05 and cooling fluid passage I06 parallel thereto. The combustible mixture is supplied through inlet connection 2|, while the cooling fluid is supplied through an inlet connection [06, to which tube 26 of Figs. 1-3 is connected; w

Heads H" andH"'- are similar to those disclosed in the aforementioned Roger 0. Day ap- 'plication Serial No. 169,373, now U. S. Patent No.

2,224,006. Head H2" is illustrated in greater detail in Figs. 21-23, head H" being similar but asymmetric to head H". Head H" is provided with a surface II5 which is inclined to the sides of the head and forms one surface of, a lower portion I I6, which forms a lower end of reduced thickness and permits the head to be inserted between two closely spaced gear teeth. I The head H" is also provided with an inlet III to which the combustible mixture conduit 2I' may be which'are pivotal about a common centerand the upper ends of which are formed as cylindrical segments 63 and '64 having equal radii. Asbefore, the cylindrical segments interfit'and are provided with scales 45' and 46' which read in opposite directions and which may be stamped or etched on the peripheries of the cy- I lindical segments, '01 stamped on metal strips riveted to the arms. Scales 45 and 46' cooperate with an indicatirm mark 44' on the side of a plate 53 provided with an upper leveling surface 42'. Arms 5I and 52 are pivotalabout a stud 54 extending outwardly from plate 53 and passing centrally through cylindrical segments'fland 64', plate 53 being disposed outside the cylindrical segments, ratherthan between them, in order to accommodate the means for positioning the device the proper distance above the top of the tooth and in vertical alignment with the center line of the tooth, which will be described later. As before, arms 5| and 52 may be clamped in any desired radial position by a wing nut 31'. 5

. The lower ends of arms 5| and 52 are formed as cylindrical segments 55 and 56, respectively. Cylindrical clamping blocks 51 and 58, each having radii equal to those of cylindrical segconnected, and passages Ill and II! which lead the combustible mixture to a distributing cham- Jber I20 in the lower end of the head. A plurality of heatinggas outlets I2I of substantially equal diameter lead from the chamber. I20, terminating in the surface H5, and are preferably disposed in staggered relation insubstantially vertically rows, so that the heating Jets produced will tend to overlap and produce a more even heating effect. -In addition, the distance between centers of adjoining outlets I2I increases progressively from the lower to the upper end of each row. Outlets I2I are spaced pro- .gressiv'ely further apart upwardly from the lower end of each row, so that closely adjoining heating jets will apply agreater amount of heat adjacent the root of the tooth and a progresssively lesser amount upwardly towards the top of the tooth.

The passage II9 may be disposed substantially perpendicularly to the chamber I20, sothat the combustible mixture will not be projected directly into the upper of the outlets I, and a uniform distribution of the combustible mixture to all of the outlets I2I will be obtained. The passage II8 may be drilled from the upper end of the head and the passage II9 from the surments-65 and 56, are rotatably secured to the reading in degrees and stamped around th periphery of the block, which cooperates with.a suitable indicating mark 62 on cylindrical segment 55 or (see Fig. 5). Scales 6I read in opposite directions, while scales 6I and indieating marks 62 are placed in exactly corresponding positions on blocks 51 and 56 and cylindrical segments 55 and 56, respectively.

Each clamping block is provided with a wide, deep slot 63, in which heating heads H and H of Fig. 4, or heads H" and H' of Figs. 5 and 6, may be secured by clamping plates 40' pressed against the heads by set screws 64. When a different type of head, such as heads H" and H' of Figs, 5 and 6, is used in hardening a large gear tooth T, each clamping block is rotated through 180 and attached to the upper end of: the head.- As in Figs; 17 and 18, head face II5, the ends of the passages being closed.

by suitable means, such as plugs I22 which are secured in the ends of the passages in a suitable manner, such as by welding or brazing. The distributing chamber I20 may be formed by a suitableslot in the lower portion of the head,

. the outer periphery of the slot being closed by a substantially U-shaped strip I23 securedto the head in a suitable manner, such as by welding or brazing.

The head H" is also provided with an inlet I25, to which the cooling and quenching fluid conduit 26 may be connected and from which an inclined passage I26 leads downwardly through the head to a distributing chamber I21, disposed alongside of and substantially parallel to the combustible mixture distributing chamber I 20. A plurality of quenching fluid outlets I26 lead from the distributing chamber I21, terminating in the inclined surface I I5 of the head, and are preferably inclined rearwardly and away from the heating gas outlets, desirably at an angle of about 30, so that the quenching Jets will not interfere with the heating flames. The quenching outlets I28 are also disposed in a plurality of rows so as to obtain complete quenching without splashing and interference with the heating flames. Inasmuch as the quenching outlets are inclined at an angle to the direction directing passage similar to the heating gaspassage I I9. The passage I28 and chamber I21 may be drilled from the top of'the head and lower portion H8, and the open ends thereof closed by suitable means, such as plugs I29 which are secured therein in a suitable manner, such as by welding or brazing. 1

Indicating marks 85, as in Fig. 4, are placed in corresponding positions on clamping blocks 51 and 58 alongside slots 83, to cooperate with scales 48 on heads H and H, respectively, so that the heads may be positioned properly in slots 83. Heads H" and 11" may be provided with scales similarly stamped or etched thereon, or provided with indicating marks, as shown.

Heads H and H' are of a type normally used in treating only one size of gear tooth,.i. e. 1 D.P. (diametral pitch), 1 /2 D.P., 2 D.P., 3 D.P., or '4 D.P., while heads H and H' are of a type adapted to treat either 5 or 6 D.P. Thus, heads H" and H will normally require only a single setting, and a single indicating mark will suflice for such setting. Also, in many instances, a single indicating mark will sumce on heads H and H, when positioned by device D.

A groove 51 is formed in the front of plate 53, as in Fig. 7, in which a bar 88 is slidable perpendicularly to surface 42'. The upper end of bar 88 is slotted, and a stud 69, extending forwardly from plate 53 or formed as an extension of stud 54, extends forwardly through the slot in bar 58. Bar 88 may be clamped in any desired position by tightening a wing nut III on stud 89. The lower end of bar 88 is provided with a fork II, and an indicating mark I2 on bar 88 cooperates with a scale I3, etched or stamped on plate 53 along one side of groove 61, to permit bar 88 to be placed in the correct position in groove 81, as in Fig. 7. Heads H and H, or heads H" and H', are clamped in the correct longitudinal position in clamping blocks 51 and 58, and arms 5| and 52 are clamped in the correct radial position, at a workbench or other suitable place, as previously described for positioning device D. In addition, bar 68 is clamped in the correct position by aligning indicating mark I2 with the correct mark on scale I3.

After the positioning device D and heads have been assembled, the heads are connected to headers 20, surface 42' leveled, tubes 28 connected to the heads, and unions 22 and 23 and clamps I5 and I! tightened, as previously described. With surface 42' level, the axis-of the two heads will be in a vertical position parallel to the axis of tooth T or T'. the correct position, the common center of arms 5| and" 52 is placed directly above the center line of tooth T and the heads placed in correct posithe heads will be correctly positioned with respect to the tooth, all automatically. When relatively small teeth are being treated, the positioning device D may remain afllxed to the heads, except bar 68 is moved upwardly to the position of Fig. 4, to prevent damage to the same. when larger teeth are being treated, as in Fig. 6, the positioning device D' is preferably removed. If desired, and previously pointed out, a cooling medium may'ebe circulated through the positioning device D, particularly through clamping blocks 51 and 58 and the lower ends ofarms 5| and 52, and the device left clamped to the heads during hardening.

Further in accordance with this invention, apparatus may be constructed by'which the blowpipe heads are movable universally in a plane, and supplied with a combustible mixture of gases from a single blowpipe and with a cooling medium from a single source. As illustrated in Figs. 8 to 16, such apparatus may include a manifold I5, having a combustible mixture inlet I8 at the rear end thereof, to which a nipple II at,-

tached to'the forward end of a blowpip B is secured. The combustiblemixture is led from inlet I6 into a passage I8 extending transversely of the manifold, and thence to outlets I9 at either end of passage I8 and drilled from the front of the manifold. The manifold is also provided with a transverse cooling fluid passage 88, to one end of which a valve BI is connected and to the opposite end .of which a pressure gauge 82 is connected. A suitable cooling fluid, such as water, is supplied by a hose 83 to valve 8|, which controls the flow of cooling fluid to passage 88, gauge 82 being utilized in adjusting the pressure of the cooling fluid. Disposed centrally of passage 88, and drilled in the front of the manifold, are a pair of cooling fluid outlets 84.

The apparatus also includes a pair of headers 85, which are substantially identical in construction. As in Figs. 14 to 16, each header is provided with a combustible mixture inlet 86 at the upper end thereof leading to a central passage Unless already in tion with respect to the sides of the tooth, by

sembly, including the blowpipe support, is moved upwardly or downwardly, and laterally to either side, as the case may be, until fork II engages the top edges of the tooth, as in Fig. 6. Since I surface 42' is level or horizontal, andbar 88 is perpendicular thereto or vertical, when the arms of fork, II engag the top edges of the tooth, the common center of arms 5I and- 52 will be disposed directly above the center line of the tooth and 81, and a cooling fluid inlet 88, in alignment with and disposed on the. opposite side of the header from the combustible mixture inlet and leading to a cross passa e 89. From each end of cross passage 89, a pair of longitudinal passages 98, parallel to central passage 81, carry the cooling fluid' down through the header. From the lower end of each longitudinal passage 98, a pair of transverse passages 9| lead the cooling fluid to each end of a cross passage 92, while a coolingfluid outlet 93 connects centrally with cross passage 92. Also at the lower end of each header, and disposed opposite to but in alignment with cooling fluid outlet 93, he; combustible mixture outlet 94, disposed between cooling fluid passages 9I and connecting with the lower end of central passage 81. In addition, combustible mixture outlet 94 is on the opposite side of the header from combustible mixture inlet 88, and, similarly, cooling fluid outlet 93 is on the opposite side of the header from cooling fluid inlet 88.

A pair of nipples and a union 95 connect the combustible mixture inlet 86 at the upper end of each header with one of the combustible mixture outlets- I9 in the manifold, while a tube 98, bent around as in Figs. 8 and 9, connects cooling fluid inlet 88 in each header with one of the coolingfluid outlets 84 in the manifold. Secured in the combustible mixture outlet 94 at the lower end of each header is a suitable nipple connecting with a union 23' to'lead the com-,-

convey the cooling fluid to each head from cooling fluid outlets 93 at the lower end of each header 85. The nipples attaching unions 23" and 95 to the manifold 15 and/or headers 85 maybe secured in the respective combustible 3. A device for positioning a pair of blowpipemixture inlets and outlets of the manifold or headers in any suitable manner, such as by weld-- ing or silver soldering, while nipples connecting suitable unions provided at the ends of tubes 26' and 86 may similarly be secured in the respective cooling fluid inlets and outlets of the manifold and headers. Tubes 2| and 26' are connected to the respective combustible mixture and cooling fluid inlets of heads H and H, or'

heads H" and H",', in the same manner as the connecting tubes previously referred to.

.Since the respective inlets and outlets in the headers are disposed directly opposite each other, each header 85 may be moved through substantially a complete circle, 1. e. about the inlets at the upper ends thereof. Consequently, the upper ends of the heating heads may be placed in any position about this circle. Furthermore, the tubes 26 also may be rotated through almost a complete circle, so that the heads themselves may be rotated about the combustible mixture tubes 2| as an axis. Thus, the heating heads are adjustable to any position in a plane, and therefore are substantially universally adjustable. As will be evident, positioning device D or B may be utilized in conjunction with the manifold, headers, etc. of Figs. 8-16.

It will be apparent from the foregoing description that apparatus constructed in accordance with this invention not only includes a position'ing device by which any particular predetermined position of a pair of blowpipe heads may be obtained with speed and-accuracy, but also provides means whereby a uniform and constant flow and pressure of the cooling fluid oi the heads can be obtained, as well as means whereby the heads may be made universally adiustable in a plane.v It will-be understood that other blowpipe heads than those described may be used, that types of connections diifering from those described may be used, and that various changes in the apparatus may be made without departing from the spirit and scope of this invention, as defined in the appended claims.

What is claimed is:

1. A device for positioning a pair of separately supported blowpipe heads for hardening gear teeth or the like, comprising a pair of arms pivotal about a common center; means for indicating the angular position of each arm about said common center comprising a scale on each arm indicating the number of degrees of rotation of each arm withrespect to said common center, one scale reading from a lower to a higher number of degrees in the opposite direction from which the other scale reads; and means for removably securing one of said heads to each arm. 2. A device for positionihg a pair of blowpipe heads for hardening gear teeth or the like, comprising a pair of arms pivotal about a common center; means for removably securing one of said heads to each arm; and a fork for engaging the top of a gear tooth, said fork being movable toward and away from said gear tooth andbeing adapted to be secured in a relatively fixed position so as to space said device the proper distance from the top of said gear tooth,

heads as deflned in claim 2, said device including means for indicating the relative position of said fork with respect to said device.

4. A removable device for positioning apair of blowpipe heads, comprising a pair of arms pivotal about acommon center; a plate provided with a level indicating surface; means for indicating the angular position of each arm about said common center; and means for removably securing one of said" heads to each arm, said device being so constructed and arranged that said common center may be disposed above the center of a gear tooth having its t0p surface disposed substantially horizontally, and said level indicating surface may be positioned substantially horizontally and substantially parallel to the top surface of said gear tooth, whereby each 1 head 'will be positioned accurately in operative relation with respect to one of the opposite sides of said gear tooth.

5. A device for positioning a pair of blowpipe heads for hardening a gear tooth having its top surface disposed substantially horizontally, as defined in claim 4, in which the upper end of each arm is shaped to form a cylindrical segment, and also in which said indicating means comprises a mark on said leveling plate and a scale on each cylindrical segment indicating the number of degrees of rotation ofeach arm with respect to said indicating mark, one scale reading from a lower to a higher number of degrees in an opposite direction from which the other scale reads.

6. Apparatus for heat treating gear teeth or the like comprising a pair of blowpipe heads; means for supporting said blowpipe heads; and a separate device for positioning said heads, each in operative relationship-with respect to one of the opposite wearing surfaces of a gear tooth.

. said device, comprising a pair of arms pivotal about a common center, means adjacent one end of each arm for indicating the angular position of said arm about said common center, and means for removably securing one of said heads to each arm, said means comprising a radially adjustable clamp pivotally secured to the other end of each arm.

7. Apparatus for heat treating gear teeth or the like as defined in claim 6, in which said device includes means for indicating the radial position of each clamp relative to the respective arm to which it is secured.

8. Apparatus for heat treating gear teeth or the like as defined in claim 6, in which said heads are adapted to be secured by said clamps in various positions'longitudinally of said heads, and. in which said device includes means for indicating the longitudinal position of each head with respect to the clamp by which it is secured.

9. Apparatus for heat treating a gear tooth or the like having an upper surface normally disposed substantially horizontally, comprising a pair of'blowpipe heads; means for supporting said blowpipe heads; and a separate device for a fork movable upwardly and downwardly for' positioning said device in vertical alignment with the center line of gear tooth, and means for removably securing one of said blowpipe heads to each arm.

10. Apparatus for hardening the oppositely disposed wearing surfaces of a gear tooth or the like comprisinga pair of blowpipe heads, each adapted to direct at least one high temperature heating flame and a cooling medium against successive portions of one of the opposite surfaces 0! said gear tooth; means for supplying a combustible mixture of gases; means for supplying a cooling medium; a manifold having combustible mixture and cooling medium inlets connected with the respective supply means, and passages leading to two combustible mixture outlets andtwo cooling medium outlets; a pair of headers, each having at its upper end combustible mixture and cooling medium inlets and at its lower end combustible mixture and cooling medium outlets, said headers also having passages leading from the combustible mixture and cooling medium inlets to the respective outlets, said inlets and outlets being disposed-substantially in alignment on opposite sides of said headers at the upper and lower ends thereof; means connecting one of the combustible mixture outlets in said manifold with the combustible mixture inlet at the upper end of each header; means connecting one of the from the outlets in the other header to the other blowpipe head.

11. Apparatus as defined in claim 10, including two headers, in each of which the combustible mixture inlet is disposed on the opposite side of the header from the combustible mixture outlet and the cooling medium outlet is disposed on the opposite side of said header from the cooling medium inlet.

12. Apparatus for hardening oppositely disposed surfaces of gear teeth or the like, comprising, in combination, apparatus as defined in claim 10; and adevice for positioning said blowpipe heads, said positioning device comprising a pair of arms pivotal about a common center, means for indicating the angplar position of each arm about said common center, and means for removably securing one of said heads to each arm.

FRANK MCGUIRE, JR.

CERTIFICATE OF CORRECTION. Patent No. 2,522,505. June 22, 191%.

FRANK HcGUIRE, JR.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction aa followsz Page 1, sec- 0nd column, line 55 for inoperative read -operativ'e-; page 7, first column, line 2, claim 9, before the word 'g eax insert --said-; and'that the said Letters 1 atent should be 'read with this correction therein that 4 the same may conform to the record'of the case in the Patent Office.

Signed and sealed this 27mm of July, A. D. 191;

. Henry Van Arada1e, V (Seal) Acting Commissioner of Petenta.

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