US1387934A - Means for making springs - Google Patents

Description

Patentd Aug. 16,1921.

2 SHEEISSHEET l.

rllllllllllllll IIIX J. c. MONTEITH AND L. A. FRAYEH'.

MEANS FOR MAKING SPRINGS. APPLICATION FILED AUG. 13. IBIS.

3 y S I. TIL. HJI H M U H 1 u a r n nL T u lllllll ll 1. .n G m 3, L Always!" J. C. MONTEITH AND L. A. FRAYER.

MEANS FOR MAKING SPRINGS.

APPLICATION FILED AUG.13. 1919.

Patented Aug. 16, 1921.

2 SHEElS-SHEET 2' Haw avwawtoz ith m gmeAl myer UNITED STAT S] PATENT OFFICE.

. corms. mcnrnrrn', or cmvamnn, AND ran a sauna, or'corumaus, arms rca MAKING sramcs. I

ToaZZwkomz'tma z concem: p Be it known that we, Jorm C. MONTEITH and LEE -A. FRAYER citizensof the United States, residing at (ilex eland, in the county of Cuyahoga and State of Ohio, and Columbus, in the county of Franklin and State of Ohio, respectively have invented a cer tain new and useful Improvement in-Means for Making Springs, of which the following is a specification. I r

The object of this invention is an improved machine for the successful cold -roll-' 1mg of the leaves of an, elliptical spring, so

called, such asis commonly used in vehicles of various kinds. The problemsinvolv'ed in such an aim are chiefly: first to so roll the leaf that the'curvature at its ends conforms substantially to'the curvature of the portion intermediate the ends; and secondly to impart to all the difi'erent'lngths of leaves to be used in the same spring substantially the e same curve.

. The invention is embodied in the machine herein described, the features of novelty being finally claimed.

In the accompanying drawings Figure 1 is a topplan view with a portion broken out. I

Fig. 2 is a combined vertical section and side view, the section being taken on the line 11-11 Fig. '1. v

' Fig. 3 is a s de elevation the left hand sideof Fig. 1.

Fi 4 is 'a horizontal section on the line 111- II Fig. 2.' V x Fig. 5 shows the type of spring made up of the leaves to be made with the machine.

In the views E designates a table or superstructure that is su ported upon a suitable frame havinglegs The rolls are shown as arranged in two groups AA, B, G and D and a, b, c and d projecting above the table,

as viewed from one group to take the first pass and the other to take the second, the. latter pass bemg made by sending theleaf through the rolls in reverse direction. Each grouol is substantially identical with the other but arranged in reversed position forthe purpose of facilitating manipulation of the leaf in the passes. A description of one group of the Specification of Letters Patent. A I

' Application flied August 18, 1919. Serial No. 317,182.

around the axis of the adjusting and fixing the frame G comprises together by gears a and b to rotate in opposlte directions. The roll 0 spindle 0 having a gear 0. c are engaged by an intermediate gear 0 to cause the roll 0 to rotate in the same directlon as the roll a. The position of the roll a is fixed while the roll 0, its gear 0 and the gear a are earned inta frame G adjustable roll a. The means for is fixed on a ahorizontal rod H hinged at one end to the frame G and having its other end threaded and engaged by a threaded hand wheel I loosely mounted in the vertical wall of the table. proper direction the roll a can be moved OHIO.

Patented- Aug. 1c, 1921."

The gears a and By turning the hand wheel I in the transversely with reference to the feed line between the rolls a and b and so vary the degree of bend impartedto the leaf.v The roll (1 has spindle'd' and gear d and the gears b and d are engaged by an intermediate gear 03 turn'in the same direction as the roll 6.

The position of the roll I) is fixed while the roll 11, its gear d and the gear 03 are earned in a frame G adjustable around the axis of the: roll 6. The means for adjusting the frame G comprises a rod H and handle wheel I like those described and represented at H and I and operating in the same manner.

IIhe rolls A, B, C and D equipped with gears A B, C and D in the same manner and relation to each other as the rolls a, b, cvand d and the rolls C and D are adjustable by like means arc-wise in relation to the rolls'A and B respectively as the rolls 0 and d to the rolls a and 6 respectively, the only difi'erence'being that the positions of the rolls C and D with respect to the rolls A and -D respectively is the reverse of the positions of the rolls a and d with respect to the rolls a and 6 respectively.

All the rolls of each group or set are driven, the arrows Fig. '1, indicatingthe direction of motion in each group.

-To impart motion simultaneously to the two groups the spindles a and A of the rolls a and A are made longer and provided with crown gears a and A respectively; pinions a and A respectively fixed on a shaft J having a drivin pulley K (see Fig. 2). The pimons a an of course, drive the shafts a and A in' opposite directions to cause the roll 01 to said gears being engaged by beveled have spindles part bent by the joint action of the other roll.

To correct this the leaf is next passed with the unbent' end inserted first between the rolls a and b so that the rolls a, b and 0 shall impart to the uncurved end the desired curve conforming as nearly as practicable to the curve ofthe rest of the leaf. The unbent end referred to can, of course, be corrected if desired by passing the leaf in reversed %osition throughthe first group of rolls A, C and D. I

When steel is bent to a desired form cold by bending in a positive direction only there remains in the metal internal strains which tend to return the piece to its ori inal shape.- When steel so formed is heated as for tempering in the case of springs)- the various leaves or plates change considerably 1n the heat, bath and draw, the amount bemg very variable according to the condition of the metal before cold "forming,'the method of forming and whether formed in a sin le operation or several. To give the leaves t e desired form and so that they shall retain their forms upon tempering we have found a plurality of passes through different groups of rolls desirable.

In the primary series the two major rolls A and B are fixed in relation to one another and rolls are used of diameters such that there is just a sufficient space between them to accommodate the desired thickness of steel to be formed. Thus bothA and B lie practi-, cally on one of the radii of the curve to be rolled. The roll C is adjustable about A as its center to givethe desired curvature and should be termed as a ositive roll. The roll D is adjustable about as a center and may be termed a negative roll.

The steel bar on entering the rolls A, B, C is. givena positive bend to a radius-less than that desired and on passing through this given a negative or straightening act1on between A, D to a radius greater than desired. On the lead end of the leaf for a distance from A to D this negative action will not be in effect andthis portion will not have a true curvature. On the 'follow end of to a slightly greater radius than D. This reverses the condition causing the inaccuracies in the first ass and practically rectifies them. By addlng further groups of rolls and alternating, making one end of the leaf the lead and follow end, the defect at the end can be reduced to a negligible uantity.

The group a, b, c and at for nally bending the leaves are set to impart substantially the same curve to all the leaves of a given spring. When the leaves are so curyed and superposed upon each'other a narrow arcu ate space is left between the middles of the leaves with the ends lapped. The application of the usual bolt M or clip closes said spaces, as seen in Fig. 5.

The distance between the peripheries of the rolls A and B and a and b, for examples, can be changed with small expense by substituting rolls of different diameters on the same shafts.

The forms of the parts can be varied without departing from the gist of the invention as claimed,

What we claim is:

1. Means for bending spring leaves comprising, in combination, a pair of rolls each having a fixed axis of rotation and between which the leaf is passed, said rolls being geared to rotate in opposite directions, a companion roll for each of said rolls, one of which is geared to its mate and is independently adjustable with reference to the passage between the first mentioned pair.

2. Means 'for bending spring leaves comprising, in combination, a pair of rolls each having a. fixed axis of rotation and between adjustable on an arc about the axis of the fixed rollof which it is a companion and with reference to the passage between the first mentioned pair.

JOHN c. MONTEITH. LEE A. FRAYER.

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