US991175A - Apparatus for making spiral rolls without mandrels. - Google Patents

Description

O. I. SHIRLEY. APFARATUS FOR MAKING SPIRAL ROLLS WITHOUT MANDRELS, APPLICATION FILED D120. 2, 1909.

91,1751 P1111181 May 2,1911.

2 SHEETS-S11E21 1.

C. I. SHIRLEY.

APPARATUS FOR MAKING SPIRAL ROLLS WITHOUT MANDRELS.

APPLIGATIO'H FILED DEC. 2, 1909.

991 175., Patented May 2,1911.

2 SHEETS-SHEET 2.

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(i w if? is CEPHAS I. SHIRLEY, 0F NEWARK, NEW JERSEY, TSSIGNOR T0 HYATT ROLLER BEAR- IN G OMPANY, 0F HARRISON, NEW JERSEY, it. CORPORATION OF NEW JERSEY.

APPARATUS FOR MAKING SPIRAL Rt}: .125 WITHOUT MANDBELS Specifl .ation of Letters Patent.

Patented May 2, ran.

To all whom it may concern:

Be it known that I, CnPHAs I. Sumner, a citizen of the United States, residing at 319 Clifton avenue, Newark, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in Apparatus for Making Spiral Rolls "Without Mandrels, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

The object of this invention is to furnlsh a means of making cylindrical spirally wound rolls for use as anti-friction bearing rolls.

It has been proposed to make the cylindrical coils by feeding a straight strip continuously through a tapering hollow die having a tapering mandrel with the strip pressed thereon at various points; but I have found that the mere coiling of the strip in a tapering die is not suflicient to produce a roll of perfect cylindrical shape, as such die must be supplemented by a cylindrical bore of suitable length in which the coils may be worked into their final form. I also find that the strip can be worked into coils more of fectively when fed intermittently into the tapering die. I also'find it desirable to apstrip.

ply a pair of feeding rolls to the strip where 1t enters the tapering die, one of such rolls being supported within the'hollow die in contact with the inner side of the strip, and the other being supported outside of the die in contact with the outer side of the strip, and such rolls operating intermittently in unison with the intermittently actuated The invention also includes details of. construction, all of which will be understood by reference to the annexed drawing, in which Figure 1 is a front elevation of the apparatus; Fig. 1 is a longitudinal section of the reciprocatingclamp; Fig. Q'is a plan of the apparatus with the upper half of the forming die removed; Fig. 3 shows the rear end of the forming die and the rolls, ata point where they are applied to the coils therein; Fig. 4, where hatched, is a longitudinal section of the die and thecoils therein; the rolls and their gearing being shown with their attachments to the die; Fig. 5 is an end elevation of the rack-connection for the bottom roll; and Fig.6 is a section of the pinion and bevel-gear for driving the lower roll, the View being taken through the ratchet-connection between the two gears.

A designates the bed of the machine, with the die B secured upon one end, and a crankshaft C and driving-shaft D journaled upon the other end and connected by gears E, the shaft C having a crank-pin H which reciprocates the slide K by means of a connectingrod. The slide K is movable to and from the die B upon the ways L on the bed A. The clamp for feeding the strip a intermittingly is mounted upon the slide K, and consists of a tapering block I fitted into a tapering slot J in the upper part of the slide and pressed normally into the slot by a spring I.

The clamp I operates to bite the strip a when the clamp moves toward the die B and to release it when moved in the opposite direction, the block I then sliding over the strip a and taking a fresh hold when the slide moves forwardly. The clamp thus feeds the strip intermit-tingly into the die.

The die is shown formed with a cylindrical bore aat its deliveryend, and a tapering bore 6 extended therefrom to the entering end. Near the entering end a slot 0 is formed, as shown in Figs: 2 and 3, tangential to the periphery of the bore, and directed obliquely to the axis of the die; so that the strip a when forced into the die by the reciprocation of the clamp is not only bent into coils, but the coils forced forwardly into the smaller part of the bore, as shown in Fig. 2. Such oblique inclination of the slot to the bore prevents the successive coils from accumulating one upon another in the die, and leads the primary end of the strip into a coil which clears the entering strip, and produces a succession of adjacent coils which gradually advance in the bore 6, until they enter the bore a where they are reduced to the ultimate size desired.

The first bending of the strip tends to distort its cross section and gives its exterior surface a more or less channeled or concave cross section. This is corrected by applying rolls (2, e to the primary coil, the housing 7 for such rolls being shown in Fig. 4 secured upon the top of the die, and the roll-shafts connected by bevel-gears g. The housing is so constructed as to support the roll e inside the hollow die in contact with the inner side of the strip and the roll 6' in contact with the outer side ofthe strip. Such arrangement of the inner roll would be impossible if a mandrel were used.

As the strip advances intermittingly the rolls also require to be fed intermittingly, which is effected by a gearing-connection to the reciprocating slide K. Such gearing consists of a pinion h fitted to oscillate upon the shaft of the lower roll 6 adjacent to its bevel-gear g, and having a pawl and ratchetconnection with the bevelear.

The ratchet-teeth i are ormed in an endless circular series upon the face of the bevel-gear as shown in Fig. 6, in which the section. extends from one edge of the gear to the opposite edge in a circular path through the ratchet-teeth, and the pinion h is provided at one side of its center with apawl j pressed by a spring into the ratchetteeth, so that when the pinion is turned in one direction, during the bending movement of the strip, it rotates the bevel-gear and the roll e, and when turned in the opposite dimotion the pawl slips over the ratchet-teeth.

The pinion is oscillated by a rack 7: movable through a box Z hinged loosely upon the shaft of the roll e adjacent to the pinion,

and the rack is reciprocated by a bell-crank m having a link-connection it with the reciprocating slide K. The arm of the bellcrank which connects with the link 01 is slotted to permit a variation of the move-' ment of the rack and pinion, so that the rolls may'feed the strip at the same rate as the clamp I. i

From the above description it will be seen that I do not employ any tapering mandrel within the tapering portion of the die, as the velocity of the coils constantly increases with the reduction in their diameter. so that the uniform rotation of a mandrel would produce a needless resistance to the movement of the coils. In place of such a mandrel, I use the inner bending roll 0 operating at one point only upon the strip, which roll, with the outer roll serves not only to bend the strip into coils, but to change its cross section, and also assist greatly in feeding the advancing coils.

It will be understood that where the strip is forced endwise into a hollow die the fric- Where a relatively thin strip is used, such a swage is not necessary, but if the process and apparatus be employed with a relatively thick strip, then such additional means of bending the strip in the die is desirable.

It is old to wind a strip upon a tapering mandrel with rolls pressed upon the exterior of the strip, and also to force a strip tangentially into a hollow die without any rotating roll inside the die, and I therefore, disclaim such constructions. My invention differs from prior constructions, in feeding the strip intermittingly, and in providing the rotating roll e within the die to bear upon the inner side of the strip, and the roll e to bear upon the outer side of the strip at the same point, so as to shape the strip as it enters the die.

Having thus set forth the nature of the invention what is claimed herein is:

1. The means for making spiral coils for bearing rolls without amandrel, which consists of a tapering hollow die, a clamp suitably operated to intermittently grasp and feed a strip tangentially into the die, a roll within the bore of the die in contact with the strip at one point, and a roll opposed to the same upon the outer side of the strip, and means for intermittently rotating the rolls for suitably shaping the strip and assisting the feeding movement.

2. The means for making'spiral coils for bearing rolls without a mandrel, which consists of a tapering hollow die, a clamp suitably operated to intermittentl grasp and feed a strip tangentially into tiie die, a roll within the bore of the die in contact with the strip at one point, and a roll opposed to the same upon the outer side of the strip, and mechanism connecting the intermittently moving clamp with the rolls and operated to intermittently rotate the same for suitably shaping the strip and assisting the feeding movement.

3. The means for making spiral bearing rolls, which consists of a tapering hollow die having a tangential opening near the larger end, a slide with a clamp to grasp a strip and feed it into such opening, means for reciprocating the slide and clamp intermittingly to feed the strip, and rolls operating upon the strip in the die with connections to the reciprocating slide for intermittingly rotating the rolls in unison with the move ment of the strip.

In testimony whereof I have hereunto set myhand in the presence of two subscribing witnesses.

1 CEPHAS I. SHIRLEY. Witnesses:

CLIFFORD A. SLOAN, IVY W. AsLrN.

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