US916530A - Tube-bending device. - Google Patents

Description

E. J. BUTLER.

TUBE BENDING DEVICE.

APPLIoATIoN FILED AUG. s. 190s.

Patented Mar. 30, 1909.

z SHEETS-SHEET 1.

Mmmm! 1HE NaRRls Ps co.. wasumsron, n. c.

E. J. BUTLER.

TUBE BENDING DEVICE. APPLIoATIoN FILED AUG. a. 190e.

91 6,530. Patented Mar. 30, 1909.

2 SHEETS-SHEET 2.

abbr/nua l tatable forming dies UNITE STATES PATENT OFFICE.

EDWARD J. BUTLER, OF GRAND RAPIDS, MICHIGAN, ASSIGNOR TO .'I. W. YORK AND SONS, OF GRAND RAPIDS, MICHIGAN, A CORPORATION OF MICHIGAN.

TUBE-BENDING DEVICE.

Specification of Letters Patent.

Serial No. 447,586.

Application filed August 8, 1908.

head 2 is gibbed in ways 2u on the table 1 and is yieldingly moved toward the shaft 3 the tension of which is main- To all 'whom it may concern:

Be it known that I, EDWARD J. BUTLER, l a citizen of the United States of America, rei by a spring 8, siding at Grand Rapids, in the county of tained through the links 8, the eye-bolts 14, Kent and State of Michigan, have invented which are provided with adjusting nuts 14, certain new and useful Improvements in l and the brackets 13 which are fixed on the Tube-Bending Devices; and I do hereby detable 1. On the head is fixed a screw threadclare the following to be a full, clear, and ed bracket 11 to receive the screw 5, the end exact description of the invention, suoli as of which screw engages the bearing 12, and will enable others skilled in the art to which l is adapted to move the head 2 backward it appertains to inake and use the same. l against the tension of the spring S, a hand My invention relates to improvements in wheel 5a being provided for rotating said tube bending devices, and more particularly screw. Splined to the upper end of the to such devices as are adapted for bending shaft 3 is one of the forming dies which conthe tubing used in the manufacture of brass l sists of the lower half 6 and the upper half musical wind instruments; and its object is 6a. These halves are caused to register in to provide a device in which such tubes may their proper relation by the spline 16 and the be bent rapidly, uniformly and true; that pins 17. A gear 9 is fixed on the lower halll will avoid buckling or wrinkling the tubes 6 of the die and is also engaged by the spline on the compressed or concave side of the 16. A flange cap screw 3 is threaded in the curve; that will permit the bending of such uppei' end of the shaft 3 to hold the two tubes in either true or irregular curves, and halves 6 and 6L of this forming die together in various other new and useful features.

when the device is in operation. hereinafter more fully described and par- A stud 4 is fixed in the head 2, said stud ticularly pointed out in the claims.

being parallel with the shaft 3 and spaced My device consists essentially of two roapart therefrom. Upon this stud is mounted one of which is prothe second forming die 7, on the under side vided with means for clamping one end of of which is fixed a gear 10, which when the the tube to be bent to the same, providing dies are in operative position meshes with means for holding the two dies in yielding the gear 9 of the other forming die and synengagement with the tube to be bent, and chroiiizes the peripheral relation of these providing means when a tube is bent in dies when in the operation of bending a tube. more than a half circle lor removing the A flanged cap screw Ala is threaded in the bended tube without springing or unbending upper end of the stud 4 to hold the forming the saine, as will more fully appear by referdie 7 in horizontal operative position; ence to the accompanying drawings, in The operation of my device is as follows: which:

After the tube to be bent is prepared in the Figure 1 is a plan view of my improved usual manner, it is secured to the extension bending device; Fig. 2 a vertical section 6b of the divided foiming die by the clamp taken on the line 2 2 of Fig-.1; Fig. 3 an end 1S. .The forming dies are brought into enelevation of the saine; and Fig. 4. an enlarged gagement with the tube and the gears 9 and detail Ain plan view of the two forming dies 10 in mesh by the tension of the spring S illustrating the manner in which the tube as which is set sufficient to overcome the remade ready to commence the operation of sistance developed by the bending of the bending is held in the machine (the arrows tube. The forming dies are then rotated in indicatin the direction of rotation of the the direction indicated by the arrows (Fig. forming ies). l) until the required amount of curvature Like characters refer to like parts in all of is obtained. the figures. In many of these bending operations the 1 is a table integral with which is a bearing tube is required to be bent more than a half 1' in which is journaled a shaft 3, which circle, which would make it impossible to shaft is also journaled at its lowei' end in an remove the bended work from the die around auxiliary bearing 12 and provided with a which it is bent without springing or ungeai 15 through which motion is imparted to bending it suflicient to pass it over the largest said shaft 3. A horizontally adjustable diameter of the groove of the die. To avoid this necessity, I have divided the forming die around which the tube is bent in the plane of the axis of its groove, and after the tube is bent to the required degree, l draw the head which carries the forming die '7 away form the work by means of the screw 5, remove the clamp 18, then the flanged cap screw 3a, and then the upper half 6a of the forming die is removed and the work fully released. The peripheral conformation of these forming dies, and the cross section conformation of their grooves may be varied to meet the requirements of any particular shape of tube to be bent, thus developing any required form of curve or angle desired.

By my improved, device l ani able to bend tubing from the lightest to the heaviest into any required form Without buckling the concave side and at a great saving of time and expense. am able to bend a tube complete from the time of putting the work into the device to removing it and preparing the device for the reception of another' tube in two to three minutes, while to bend a like tube by hand as now done, would require from three to four hours. Another advantage that l gain is a perfect uniformity of work.

ifi/*hat I claim is:

l. ln a device of the class described, the combination of two rotatable forming dies having grooves in their edges, means for synchronizing the lperipheral relation of the dies, means for detachably securing one end of the tube to be bent to one of said dies, a spring for yieldingly holding the dies in contact with the tube, means for imparting a rotary motion to said dies, and means for overcoming the tension of the spring to separate the dies.

2. n a device of the class described, the combination of two rotatable forming dies having grooves in their edges one of said dies being divided in the lane of the axis of its groove the peripheralp relation of which dies is maintained by gears, means for detachably securing one end of the tube to be bent to one of said dies, a spring for yieldingly holding said dies in contact with said tube and the gears in mesh., means for imparting a rotary motion to said dies, and a screw to overcome the tension of the spring and separate the dies.

3. In a device of the class described, the

combination of two rotatable formin dies having grooves in their edges, one o said dies being mounted on a driving shaft, a head adapted to be moved toward and from the first named die, on which head the other die is mounted, gears to synchronize the peripheral relation of said dies, a spring engaging the head to hold said dies in peripheral contact and said gears to mesh, a screw to move the head away from the shaft, a clamp to detachably secure one end of the tube to be bent to one of said dies, and means for rotating the said dies.

Li. In a device of the class described, a table on which a rotatable die having a groove in its edge is j ournaled, a head adapted to traverse in the table in ways therein, a second rotatable die having a groove in its edge and journaled on said head, a spring attached to the head to move said second die into engagement with the tube to be bent,

gears on said dies which mesh to synchronizethe peripheral relation of the same, an eXtension on one of said dies, a clamp to secure the tube to be bent to said extension, means for imparting a rotary motion to said dies, and a screw to move said head against the tension of the spring.

5. in a tube bending machine, a driving shaft, a rotary die fixed on the shaft, a head movable toward and away from the shaft, a second rotary die journaled on the head, an oppositely projecting spring carried by the head, tensioning bolts attached to the respective ends of the spring and slidable in fixed brackets, nuts on the bolts, and a screw connected to the head to move the same to separaterthe dies.

6. In a binding machine, a table, a driving shaft journaled in the table, a head movable toward and from the shaft, rotary dies respectively on the shaft and head, gears conL necting the dies, a spring carried by the head, and opposi'tely projecting therefrom, tensioning bolts attached to the spring, brackets attached to the table in which the bolts are inserted, and a screw mounted in the head to iove the same away from the shaft.

in testimony whereof I affix my signature in presence of two witnesses.

EDVARD J. BUTLER. lVitnesses GEORGIANA CHACE, MINNIE JoHNsoN.

Images