US1673185A

US1673185A - Spring-coiling machine

Info

Publication number: US1673185A
Application number: US81169A
Authority: US
Inventors: Combes Lloyd E Des
Original assignee: International Harverster Corp
Current assignee: Navistar Inc
Priority date: 1926-01-14
Filing date: 1926-01-14
Publication date: 1928-06-12
Anticipated expiration: 1945-06-12

Description

June 12, 1928.

L. E. DES COMBES SPRING COILING MACH INE 7 Filed Jan. 14, 1926 4 Sheets-Sheet 1 .lllllllll EEEEEEEW i I e Lzoyi l fl L. E. DES COMBES SPRING COILING MACHINE June 12, 1928.

Filed.Jan. 14, 1926 4 Sheets-Sheet 5 ive I". l y w fl 0 5? June 12, 1928. 1,673,185

L. E. DES COMBES SPRING COILING MACHINE Filed Jan. 14, 1926 4 Sheets-Sheet 4 Patented June 12, 1928.

nnrreo STATES 1,673,185 PATENT OFFICE...

LLOYD E. DES commas, or SPRINGFIELD, oH:ro, A'ssIGNoR r INTERNATIONAL HAR- vnstrnn COMPANY, A CORPORATION OF NEW JERSEY.

SPRING-COILING MACHINE.

Application filed January 14, 1926. erial l lo. 8 1 ,1 G9

This invention relates to machines for forming coils in spring members. a

, In the preferred embodiment hereinafter disclosed there is iilustrated av machine. of this type which is seini-a'uton'iatic and is adapted to form spring teeth such as commonly employed in connection with the raking cylinders of hay rakes and hay loaders.

It is an object of this invention to provide a machine. of the kind specified which will operate efliciently for the purpose intended.

It is a further object to provide a machine which will simultaneously form two spring members, thereby materially speeding up production. v

Another object is to provide an improved mandrel for forming coils in the spring.

Other objects should be apparent to anyone skilled in this art as the description hereof progresses.

Briefly these objects are accomplished in the provision of a machine comprising a frame having a mandrel carrying or coiling shaft journaled therein.- said shaft adapted to be rotated forwardly a predetermined number of rotations by a novel form of driving mechanism, the shaft then being reverse, ly rotated to a predetermined position for the purpose of loosening the coil which has been formed by the forward rotation of the shaft and also to have the mandrel in enact position for starting and then to hold said shaft idle for a predetermined interval of time to permit the operators working on the machine to remove the finished spring from a novel form of mandrel carried by said shaft before the shaft is again forwardly rotated to form the next spring member. Means is also provided for imposing a. braking action upon the mandrel carrying shaft to overcome its momentum just before it is reversed and again at the instant, or just prior to the time, it. is completely stopped.

Reference is made to the accompanying sheets of drawings wherein like characters of reference denote like parts throughout the views, and in these drawings,-

Fig. 1 is a side view of the machine, partly in section. as viewed along the line l--l of Fig. 2; 7

Fig. is a plan view of the machine;

Fig. 3 is a front view;

Fig. d is a sectional view of clutch utilized in this machine as viewed along the line t4 of Fig. 5;

Fig. 5 is a sectional View of the same clutch when viewed at right angles to the View shown inQFig, 4; I

Fig.6 is a detail side View of the brake and the means foroperating the brake to impose a frictional drag on the mandrel carrying shaft Fig. 7 is a detail plan view of the bracket which adj ustably supports a supplen'ientary mandrel shaft for holding the legs of a sprmgtooth being formed on the mandrel shaft, as Viewed along the line 77 of Fig. 3; v

Fig. 8 is a detail view showing the mechanism which cooperates with a cam on the main mandrel shaft to keep the same from rotating at, predetermined times, as when a finished spring is to be removed from the mandrels;

Fig. 9 is a detail view showing the mannor of positioning a preformed member on the mandrel With the legs thereof held by the supplementary shaft to form the same into a finished rake spring tooth;.

Fig. 10 is a sectional view showing an illustrative form of the improved mandrel utilized in the present. machine;

Fig. 11 is a sectional view of the mandrel carried on the supplementary or leg holding shaft;

Fig. 12 is a plan View of the member which must be preformed, as shown, and generally in the shape of a U, before the same can be coiled into the finished spring rake tooth; i

Fig. 13 is a side view of the same member;

Fig. 14 is a plan view of the member shown in Figs. 12 and 13 after the same has been coiled intermediately of its ends to form the finished raking tooth; and

Fig. 15 is a side view of the same finished spring tooth.

The improved spring coiling machine comprises a main frame carried on a base 21. Journaled in the frame is a driven shaft 22, carrying adjacent one end a pinion 23 and at its opposite end a pulley 24, which is belted in a conventional manner to any usual overhead shafting employed in machine shops. The pinion 23 meshes with a larger gear 25 keyed to a shaft 26, the shaft 26 protruding outwardly from one side of the frame and having keyed thereto at said end a pinion 27. which meshes with a large gear 28 keyed to a shaft 29, suitably journaled in the frame of the machine. This shaft 29 has a cam 30 keyed thereto substantially midway between its ends, that is, centrally arranged in the machine, ,thecam cooperating with adjacent one edge of a large quadrantal rack gear 32, said gear being formed as an extension of a bifurcated bracket 33 straddling the cam 30 and roller '31 and fixed-to a two part rock shaft 34 suitably journaled in the frame of the machine. As the cam 30 rotates with shaft 29 the quadrantal gear 32 will 7 rock from the dotted line position shown in Fig. 1 to the full line position shown in said figure, half of the cam surface acting to carry the quadrantal gear from the dotted line position to the full line position and the other half acting to reverse the gear and return it to its home position as shown in dotted lines. One face of the quadrantal gear 32 has bolted thereto a block 35 which cooperates with an adjustable cushioning member 36 carried in a bracket 3'7 (see Fig.3) bolted to the machine frame for the purpose of shortening the stroke of thequadrantal gear-and for absorbing the shock of the gear when it is returned to its home position, as shown in dotted lines in Fig. 1, it being understood that the block 35 contacts the cushioning member 36. Further to strengthen the support for this cushioning member, there is provided on the frame another bracket 38 bolted to the bracket 37 by means of a bolt 39. Adjacent the roller 31 on the quadrantal gear 32 there is provided a hook 40 to which is coupled a coil spring 41, the opposite end of which is coupled to the base 21 by means 42 shown. The function of this spring is to impart an initial impulse to the gear 32 when it is inits upper position to pull the same beyond the high point on the cam 30 and to give it a good start in its homeward direction and, of course, in combination with the cam track and roller the spring will in sure that the quadrantal gear 32 will not be moved by its momentum too far in an upward direction. The gear 32'meshes with a pinion 43 which is centrally positioned on a driven shaft 44. by means of a sleeve 45 loosely rotatable on said shaft 44 (see Fig. 5). a One end of this shaft protrudes through the side frame and carries fixedly thereon a gear 46 which mesheswith a gear 47 fixed to a main mandrel carrying or coiling shaft 48, said shaft 48 extending laterally through both sides of the machine for some distance. Each extended end of this shaft 48 is provided with a novel form of coiling mandrel to be hereinafter described.

Adjacent the pinion 43 the sleeve 45 has bolted thereto to be loosely rotatable with the sleeve 45 on the shaft 44 an internal ring member 49 of a conventional form of friction clutch, said member frictionally a roller 31 carried rotatablytioned between the disk 50 and ring member 49 and loosely rotatable on said eccentric with a ball bearing interposed. therebetween is a shoe 54 normally spaced from the internal face of the ring member 49 but adapted to contact therewith at certain times during the rotation of the shaft 44 to lock the

members

49 and 50 together so that they will rotate as a unit. As shown in Fig. 4 the shoe 54 has a hooked boss 55 extending from one end, which is fastened at 56 to the ring member 49 by means of the spring 57,the spring always serving to return the shoe to a certain predetermined position to keep the shoe normally spaced from the internalface on the member 49 and to return the same to such position after the eccentric 53 has displaced the shoe 54 to clutch the parts together.

It will be observed that'in this illustrative embodiment the length of the rack 32 is so proportioned that in its rocking movement from its down position to its upward position it will rotate the mandrel carrying shaft three times, thus forming three coils in a spring member forming on the mandrels. The stop 36 is properly adjusted to permit this range of movement of the quadrantal gear rack 32. Thus the coils will be completely formed when the rack 32 is in its upward position. The cam 30 with the aid of the spring 41 then reverses the movement of the rack 32 to return it to its home or downward position. About a third of the periphery of this quadrantal rack 32 is utilized to rotate the mandrel shaft once in a reverse direction for the purpose of loosening the coils on the mandrel so that the spring may be easily removed by the operators working on this machine. After this shaft has reversely rotated, this predetermined part of a turn or number of turns, the mandrel shaft is brought to a complete stop, and this is effected by the clutch mechanism just described and shown in Figs. 4 and 5. This is due to the particularposition of the eccentric 53 onthe shaft 44, which at this instant is so positioned that the shoe 54 will'be free of the internal face on the ring member 49, which means that the sleeve 45 and pinion 43 thereon will loosely rotate on the shaft 44 without driving the shaft 44 and so, of course, no drive can be transmitted to the mandrel shaft 48. However, in addition to this clutch, a posi tive means has been provided which is timed in its operation with the clutch positively to restrain the mandrel carrying shaft from further movement after it has reversely rot'ated as desired, and such mechanism is furthermore effective to hold the shaft idle This )ositive restrainin mechanism for the mandrel shaft will now be described.

Bolted to the side face of the quadrantal gear 32 opposite from that side which carries the block 35 is a bracket 58, one end of which has fixed therein a laterally extending rod 59 which carries at its free end a roller 60, as shown in Figs. 1 and 2. This roller 60 cooperates with a cam track 61 (in this connection see also Fig. 8), said track times cooperating with a pin 62 carried by the side frame of the machine and normally urged toward a position contacting said pin 62 by a spring 68 which is also fastened to the side frame. The cam track 61 has adjacent its forward terminal a dwell Bi and a hook portion 65 to which is lined a block 66 centrally pivoted on a pin 67 carried by the frame (see Fig. 3), said block being positioned adjacent the mandrel carrying shaft e8, said shaft 48 having at thispoint a cam 68 which is adapted to cooperate at certain times with a pivoted cushioning member 69 carried by the block 66 and normally urged toward the dog on the cam 68 by a spring 70, said cushioning member 69 being limited in its pivotal movement by means of the hook and pin 71 shown, as will be readily understood. Thus, in the upward swing of the quadrantal rack 32 the shaft 18 carrying the mandrels will be rotated forwardly, which means in a counterclockwise direction, as viewed in Fig. l, with the dog on the cam 68 passing in front of the block 71 and clicking past the cushioning member 69. Now as the rack 32 starts toward its home position the roller 60 on the shaft 59 will ride under the cam track 61, which act-ion of the roller 60 on the cam track 61 tends to raise it against the pull of the spring 63 to keep the block 71 and the cushioning member 69 thereon out of the path of the dog on the cam 68. l/Vhen the quadrant has traveled the necessary predetermined distance to its home position the roller 60 will pass off the cam track 61 and into the dwell 6% thereon, which will permit the spring 63 to exert its normal tendency to pivot the block 71 in a direction to move the cushioned dog 69 into the path of movement of the cam 68, which, of course, is now rotating with the mandrel shaft in the reverse direction. Thus, the mandrel shaft must stop by this positive means and, of course, the clutch described and shown in Figs. 4 and 5 acts at this instant to make the pinion 43 and sleeve 45 rotate loosely on the shaft 44 so that no drive can be imparted to the mandrel carrying shaft.

A braking means is also provided which automatically acts to overcome the momentum of the mechanism at the instant that the quadrantal gear 32 has reached its uppermost position, that is, in other words, at the instant the forward rotation of the mandrel shaft has been completed and just before it is to be reversed in its rotation. This mechanism, that is the braking mechanism, is also active at the instant or just before the nstant that the cam 68 locks with the cushioned dog 69 to reduce the momentum of the parts just before the mandrel shaft is brought to a standstill. This is quite an important feature of the present invention, as it prevents considerable hammering and chattering of the parts and overcomes unnecessary strains. The front side of the frame member 20 is provided with a cross piece 72 (see particularly Fig. 6), which carries a bracket 73 by means of suitable bolts and in turn having arms 74 to which is bolted a mutilated circular guard or shield 75 within which is a brake drum 76 fixed to the mandrel carrying shaft 48. The usual brake band 77 is trained around the drum 76, one end thereof being fastened to a meniber 78 to which is pivotally connected an elongated member 7 9. said. elongated member 1n turn being pivoted on a pintle 80 and the lower end of the member 79 having the other end of the brake band fixed thereto. The pintle 80 also carries a cam shaped lever 81, the lower end of which, or the tail end of which. has fitted thereto a rod 82 reciprocable through the frame piece 72 and bracket 73, as shown. Adjacent one corner of the quadrahtal gear 32 just inside of its marginal edges is fitted a spring pressed roller 83 which in its downward and upward swinging movement at certain times contacts the cam lever 81, as shown in the dotted line positions 84 and 85 of the roller, to impose a frictional drag on the mandrel carrying shaft to overcome its momentum at the proper times.

As stated, the illustrative embodiment of this invention contemplates a machine which will manufacture coil springs of a certain type such as are employed inthe raking cylinders of hay harvesting machines. These springs, as shown in Figs. 12 to 15, comprise a U-shaped piece of spring wire having an angular bight portion 86 which is adapted to be bolted to the frame member of a raking cylinder, and adjacent this angular bight is a pair of opposed coils 87 the continued ends of the coils being extended to form opposed, spaced, parallel legs 88 which serve as resilient gathering tines or teeth.

An improved mandrel has been provided for forming raking teeth of this kind and,

as shown in Fig. 10, it comprises a tapered body piece 89 extended into a cooperating tapered bore in each end of the mandrel shaft 18 and is detachably locked therein by a set screw 90 so that this form of mandrel may be easily removed and be replaced by another kind for formation of different coil springs, should occasion require. Another piece 91 abuts the piece 89 and is coupled thereto by means of a threaded member 92 which has cooperating cut out portions for locking over shoulders 93 formed on said piece 91. A gear 91 iskeyed to the part 91. A bored out winding or mandrel piece 95 is threadedly screwed to the free end of the piece 91 and fitted thereinto, as shown. The piece95 is provided with a cooperable piece 96 having a knob 97 and which piece 96 may be displaced or relatively moved with respect to the piece 95 by sliding the same outwardly thereacross, which will be permitted by the tapered mortise and tenon joint 98. A coil spring 98 is fitted into the hollow of the member '95 and connects the two

pieces

95 and 96 together as at 99 and 100, respectively. The

members

95 and 96 are respectively provided with sets of oppositely pitched coil forming corrugations 101. It will thus be seen that the entire mandrel is readily detachable from the mandrel carrying shaft by removal screw 90 and furthermore that the mandrel may be easily collapsed to'permit ready removal of a finished coil spring tooth.

Some means must be provided for holding the legs 88 of the spring tooth being formed while the coils are being formed therein by the mandrel just described and such means is provided in the supplementary shaft 102, which has loosely arranged thereon a pinion 103 adapted to mesh with the gear9-1 on the main mandrel. A member 104 is also loose on the shaft 102 and locked to the gear 103 by the tongue and groove joint 105 shown. This member 10-; is prevented from displacement over the end of the sta tionary shaft 102 by a set screw and washer 1.06. The member 104 is provided with oppositely pitched sets of corrugations 1.07 which are in alinement with the corrugations 101 on the main mandrel. This supplementary shaft. 102 with the parts carried thereby is fastened by means of a nut 108 to a bracket 109 secured by a belt 110 to the frame member 20 of the machine. This bracket 109 is provided with a vertically disposed slot 111 within which the shaft 102 may be adjnstably fixed by means of the nut 108 to raise said shaft 102, or lower it, with respect to the main mandrel shaft. The bracket 109 is also provided with a substantially horizontally disposed slot 112 at its lower end below the bolt 110. said bolt adapted to be loosened to pivot the entire bracket 109 to move the same closer to or farther from the ators hook over the knob 97 on the main mandrel with the legs 88 positioned under the adjacent supplementary shaft 102, the legs engaging the corrugations or grooves. The machine is then started and through the pulley 24 the shaft 22 is driven, which in turn drives the shaft 26, in turn driving the shaft 29, which, of course, imparts rotation to the cam 30 and carries the quadrantal rack 32 from its home or down position, as shown in dotted lines in Fig. 1, to swing it upwardly, the rack, of com'se, meshing with the gear 43 on the driven shaft 44 to impart rotation to the mandrel shaft through the gearing described, said main mandrel shaft being rotated a predetermined number of times dependent upon the length of the rack 32, and in this case it being of such length that the mandrels will be turned three times in a forward direction to form two sets of three coils each disposedin opposed relation and intermediately of the ends of the spring teeth being formed. The quadrant isnow in its uppermost position and the roller 31 is on the high point of the cam. The continued rotation of the cam now effects a reversal of the quadrantal rack 32 and starts it back to its home position with the aid of the. impulsing spring 41, and, in the mea-ntime. as it travels back the roller 60 controlled by the quadrant-a1 gear 232 permits the shaft 14: to rotate a single turn in a reverse direction because said roller 60 is exerting a force on the cam track 61 to hold the dog 69 clear of the cam 68. Now,however, the cam has moved about a third of its way toward its home position and the roller 60 rides into the dwell 01 in the cam track, allowing the spring 63 to return the cam track 61. against the pin 62 to move the block 71 in such a direction that the dog 69 carried thereby will lie in the path of thecam 68, thereby stopping the shaft 14. This step mechanism shown in Figure 8 is made to miss the first reverse revolution of the mandrel shaft when necessary and catch the second or part of the second reverse revolution, which loosens the coils of the spring and also stops the coiling mandrels at the same positive position for starting the next operation of coiling. At this same time the eccentric 53 is in such a position with the shaft 141 that the shoe 54 cannot rotate the internal ring piece 49 with the clutch piece 50, and the sleeve45 and pinion 43 therefore rotate idly and can not drive the mandrel shaft. Thus, during the remainder two-thirds movement of the quadrantal gear to its homev position, the mandrel shaft is idle and the operators may remove the finished springs therefrom, the single reverse rotation having served to loosen the coil on the mandrel and with the aid of the collapsible mandrel shown in Fig. 10, the operators may easily remove the finished spring teeth and place another one in position before the mechanism and the mandrel shaft are again driven in a forward direction. The mandrel shown in Fig. 10 is collapsed very easily, the operator merely pulling it endwise so that the bight 86, which is hooked over the end knob 97. Will permit the member 96 to be displaced or moved endwise of the member 95, the spring 98 returning the part 96 to normal position with respect to the part 95.

The braking means disclosed in Fig. 6 is operative to impart a frictional drag on the mandrel shaft and the driving gearing at the instant the quadrantal gear 32 has reached its uppermost position to lessen its momentum, and this is accomplished by the spring roller 83 on the quadrantal gearing contacting the tail of the lever 81, as shown at 85, to pull the band tight on the drum 76. The mechanism is then reversed and at the instant it reverses or a moment thereafter the roller 83 contacts the high cam part of the lever 81, as shown at 84. again to lessen the momentum of the mechanism by imposing a frictional drag thereon just before the mandrel shaft is brought to a dead stop by the cam 68 and the clutch shown in Figs. 4 and 5. As the quadrantal gear reaches its home position with the gearing which drives the mandrel shaft idle, the block 35 contacts the cushioning means 36 and prevents damaging shocks, this cushioning member also having been properly adjusted to limit and control the range of movement of the gear 32. The mandrels are provided with oppositely pitched corrugations to form the particular coils 87 shown in Fig. 14, and the legs 88 travel outwardly along the sup plementary mandrel on the shaft 102 as the coils 87 are formed, to maintain the legs. 88 in parallel position. Also the bracket 109, which carries the supplementary mandrel shaft 102, is easily adjustable in. a plurality of directions operatively to position this supplementary mandrel leg holding shaft with respect to the main mandrel upon which the coils are formed. Obviously the machine of this invention can be altered so that it can be utilized in the manufacture of springs having any number of coils. This would be accomplished by giving the gear 32 a longer or shorter path of movement through the medium of the stop 36, and likewise, of course, relatively changing the number of corrugations on the mandrels and changing the gear ratios of gears 46 and 47. Close coils or spaced coils can be formed easily as desired by properly arranging the mandrel corrugations and by changing the gears 103 and 94s, as will be obvious.

From the above description it will be obvious that a machine has been provided with which allof the objects expressed at the beginning of the specification may be achieved. It is to be understood that the disclosure herein is one of the preferred embodiment and that the same is capable of modification and change in many Ways Without departing from the scope of this invention, as indicated in the subjoined claims.

What is claimed is:

1. In a spring coiling machine, the combination of a frame, a pair of rotatable parallel shafts journaled in the frame, and means on the shaft for forming a plurality of opposed coils in a spring member having a pair of extended legs arranged in spaced parallel relation.

2. In a machine of the class described, the combination of a frame, a coiling shaft journaled therein, a driven shaft journaled in the frame and geared to the coiling shaft, driving means for rotating said driven shaft and coiling shaft a plurality of times in one direction, means for reversing said driving means to give the driven shaft and coiling shaft a single rotation in a reverse direction, and means for holding said coiling shaft stationary for a predetermined interval of time after. the coiling shaft has rotated a. single turn in a reverse direction while the driving means continues in operation.

3. In a machine of the class described, the combination of a frame, a coiling shaft journaled therein, a driven shaft geared to the coiling shaft mechanism for rotating said driven shaft to turn the coiling shaft a plurality of times in a forward direction, the same mechanism adapted to rotate the driven shaft to turn the coiling shaft a predetermined number of revolutions or parts of a revolution in a reverse direction, and means for holding said coiling shaft idle for a predetermined interval of time before again rotating the coiling shaft in a forward direction.

4. In a machine of the class described, the combination of a frame, a coiling shaft journaled in the frame, a plurality of mandrels fixed in the shaft. a single mechanism includinga driven shaft geared to the coiling shaft. for rotating said coiling shaft for wardly a plurality of times and for a predetermined nnmber of revolutions or less than a revolution in a reverse direction, and means for holding said coiling shaft idle a predetermined interval before again rotating the coiling shaft in a forward direction.

5. In a machine of the class described, the combination of means for forming coils in spring blanks, means including a drive shaft carrying gear for operating said coiling means in. one direction to form a predetermined number of coils, the same means reversing the coiling means to loosen the completed coil, and means'for restraining movement of said coiling means for a predetermined interval while the'operating means continues.

6. In a machine of the class described, the combination of a frame, a coiling shaft journaled therein, a drive shaft geared to the coiling shaft, a' gear for driving the drive shaft, a cam for operating the gear to turn the drive and coiling shaft-s forwardly a plurality of times, means associated with said cam for reversing the movement of the gear to turn the drive and coiling shafts in a reverse directiona predetermined amount, and means for holding the coiling shaft stationary for a predetermined interval.

7. In a machine of the class described, the combination of a frame, a mandrel shaft journaled therein, a gear for driving the mandrel shaft, a cam for operating the gear to turn the mandrel shaft forwardly a plurality of times, means associated with said cam for reversing the movement of the gear to turn the mandrel shaft in a reverse directiona predetermined amount, means on the frame and cooperable with a cannon the mandrel shaft for holding the mandrel shaft stationary for a predetermined interval, and means movable with the driving gear for controlling the operation of said mandrel shaft restraining means.

8. In a machine of the class described, the combination of a frame, a mandrel shaft jou'rnaled therein, a rocking gear for rotating the mandrel shaft a plurality of times forwardly, a cam for operating said gear, means associated with said cam for reversing the movement of the gear to operate the shaft in a reversed direction, and an automatically acting braking means for imposing a drag on the mandrel shaft to overcome its momentum just before its rotation is reversed. I

9. Ina machine of the class described. the combination of a frame, a mandrel: shaft journaled therein, a rocking gear for rotating the mandrel shaft a plurality of times forwardly, a cam for operating said gear, means associated with said cam for reversing the movement of the gear to operate the shaft in a reverse direction, and a brake on the mandrel shaft controlled by the movement of the gear for imposing a drag on the shaft to overcome its momentum just before its rotation is reversed.

10. In a machine of the class describerhthe combination of a frame, a mandrel shaft journaled therein, means for driving said shaft forwardly a plurality of rotations to form a predetermined number of coils in a spring blank on the mandrel, the same means adapted. to drive the mandrel shaft reversely a predetermined amount, means for restraining further rotation of the shaft after it has reversed as predetermined,and braking means for said shaft to impose a drag thereon to overcome its momentum at the end of its forward rotation and again at the time its rotation is restrained after it has reversed.

11. In a machine of the class describechthe combination of a frame, a mandrel shaft journaled therein, means for driving said shaft forwardly a plurality of rotations to form a predetermined number of coils in a spring blank on the mandrel, the same means adapted to drive the mandrel shaft reversely for a predetermined rotation, means controlled by the driving means for restraining further rotation of the shaft after it has reversed. as predetermined, and braking means for the shaft also controlled by the driving means to impose a drag on the shaft to overcome its momentum at the end of its forwardmovement and again at the time its rotation is restrained after 1t has reversed.

12. In a machine of the class described, the combination of a frame. a shaft journaled therein, a coiling mandrel on each end of the shaft, means for rotating the shaft a plurality of times to form coils in a spring member having legs, and supplemental shafts rotatably carried in the frame adjacent the mandrels to hold and guide the legs of the spring members while the coils are being formed therein.

13. In a machine of the class described, the combination of a frame, a shaft journaled therein, a coiling mandrel at the end of said shaft, means for rotating the'shaft to form coilsin a spring member intermediately of its ends and having legs, a rotatable supplementary shaft-carried by the frame adjacent the mandrel for holding the legs while the coils are being formed, said shaft being gearedto the first shaft and means on said supplementary shaft for maintaining the legs of the spring member in parallel spaced ali gnment.

14; In a machine of the class described, the combination of a frame. a shaft journaled therein, a coiling mandrel at the end of said shaft, means for rotating the shaft to form coils in a spring member intermediately of its ends and having legs, a supplementary rotatable shaft carried by the frame adjacent the mandrel for holding the legs while the coils are being formed, said shaft being geared to the first shaft, and means for adjusting said supplementary shaft on the frame relative to the mandrel shaft. 7

15. In a machine of the class described, the combination of a frame, a shaft journaled the-rein, a coiling mandrel at the end of said shaft, means for rotating the shaft to form coils in a spring member intermediately of its ends and having legs, a snpplementary rotatable shaft carried by the frame adjacent the mandrel for holding the legs While the coils are being formed, said shaft being geared to the first shaft and means for adjusting said supplementary shaft on the frame in a plurality of directions relative to the mandrel shaft.

16. In a spring coiling machine having a frame and a shaft journaled therein, the combination of a mandrel detachably carried by the end of said shaft, said mandrel embodying a slidable part. means for collapsing said mandrel by displacing the slidable part to assist in removing a finished spring, and means for returning the slidable part to its first position.

17. In a spring coiling machine having a frame and a shaft journaled therein, the combination of a mandrel carried thereby, said mandrel comprisii'ig two resiliently connected parts one of which is relatively movable With respect to the other for permitting easy removal of a spring formed thereon.

18. In a spring coiling machine having a frame and a shaft jonrnaled therein, the combination of a mandrel carried thereby, aid mandrel comprising tWO parts one of Which is relatively movable with respect to the other for permitting easy removal of a spring formed thereon, and means c0nnecting the two parts for automatically restoring the movable part to its normal position after the spring has been removed therefrom.

19. A mandrel for coiling springs comprising a tWO part coiling member, a resilient connection between the two parts, and one of said parts being relatively slidablc with respect to the other.

20. A mandrel for coiling springs comprising a body, a two part coiling member fitted to the body, one of said parts being relatively slidable with respect to the other, and resilient means connecting the two parts leg portion of the blank to restore the movable part to its normal position after it has been displaced.

21. In a spring coiling machine, the combination of a frame, a coiling shaft carried in the frame, means for rotating said shaft, a coiling member on the shaft adapted to receive and coil a spring blank having an extended portion, and a rotatable member for holding said extended portion of the blank While coils are being formed therein.

22. In a spring coiling machine, the combination of a frame, a coiling shaft carried in and extending through the frame, means for rotating said shaft, a coiling member on one end of the shaft for receiving and coiling a spring blank having an extended leg portion, a shaft for holding the said leg portion of the blank, and means for rotating the holding shaft from the coiling shaft.

23. In a spring coiling machine, the combination of a frame, a coiling shaft journaled in the frame having an end extending beyond each side and free of the frame, means for rotating said shaft, a coiling member on each end of the coiling shaft for receiving and coiling a spring blank having an extended leg portion, and a rotatable shaft parallelv with the coiling shaft and adjacent each coiling member for holding the leg portion of each blank.

2st. In a spring coiling machine, the combination of a frame, a pair of shafts carried in the frame, means for rotating the shafts, and means on one of the shafts for engaging and forming coils in a spring blank having a leg portion, the other shaft engaging and holding the leg portion of the blank during the coiling operation.

25. In a spring'coiling machine, the combination of a frame, a pair of parallel shafts carried in the frame, means for rotating the shafts in opposite directions, and means on one of the shafts for engaging and forming coils in a spring blank having a leg portion, the other shaft engaging and holding the during the coiling operation.

In testimony whereof I affix my signature.

LLOYD E. DES COMBES.