US1173169A

US1173169A - Apparatus for making square tubing.

Info

Publication number: US1173169A
Application number: US73778612A
Authority: US
Inventors: William F Burditt Jr
Original assignee: LOY AND NAWRATH Co
Current assignee: LOY AND NAWRATH Co
Priority date: 1912-12-20
Filing date: 1912-12-20
Publication date: 1916-02-29
Anticipated expiration: 1933-02-28

Description

w. F. BURDITT, JR.

APPARATUS FOR MAKING SQUARE TUBING.

APPLICATION FILED DEC-20.1912.

1, 173,1 69. Patented Feb. 29, 1916.

4 SHEETS-SHEET l.

9mm 1'? MAW,

THE COLUMBIA XILANOGRAPH 0 WASHINGTON, D. C.

W. F. BURDITT, JR. APPARATUS FOR MAKING SQUARE TUBING.

APPLICATION FILED DEC- 20, I912. 1,173,169. 7

Patented Feb. .29, 1916.

4 SHEETS-SHEET 2.

ATTORNEY.

THE COLUMBIA FLANOGRAPH (30., WASHINGTON. D- C.

1/ @wssm J w. F. BURDITT, IR. APPARATUS FOR MAKIN G SQUARE TUBING.

APPLICATION FILED DEC-20, I9I2.

Patented Feb. 29,

4 SHEETS-SHEET 20 25 f% M f 'i W hnonmsr- W. F. BURDITT, JR.

APPABAT 0R MAKIN ARE TUBING. AP ION FILED I 0.1912.

1,173,169, Patented Feb. 29, 1916.

4 SHEETSSHEET 4.

WITNESSES 7 J w WILLIAM F. BURDITT, JR., 011' LYONS FAR-MS, NEW JERSEY, ASSIGNOR T0 LOY AND NAWRATH COMPANY, A CORPORATION OF NEW JERSEY.

APARATUS FOR MAKING SQUARE TUBING.

Specification of Letters Patent.

Patented Feb. 23?, 1918.

To all whom, it may concern Be it known that IJVILLIAM F. BURDITT, J12, a citizen of the United States, residing at Lyons Farms, in the county of Union and State of New Jersey, have invented certain Improvements in Apparatus for Making Square Tubing, &c., of which the following is a specification.

The objects of this invention are to provide means for bending sheet-metal into tubes of square or rectangular cross section with maximum speed and convenience; to avoid the necessity for mounting the female die upon the sliding carriage; to PlOVldS a swinging head upon the upper die holder, which is adapted to carry the mandrel carrier and also the closing-in die; to thus enable the mandrel and the closing-in die to be brought successively into position to cooperate with the female die, with great accuracy and exactness; to provide a female die comprising a grooved middle member to form the initial bends and overhang the side members to form the closing bends; to secure simplicity of construction and operation; to reduce the cost of manufacture of tubing, and to secure other advantages and results as may be brought out in the following description.

Referring to the accompanying drawings, in which like numerals of reference indicate the same parts throughout the several figures, Figure 1 is a front elevation of a power press embodying my invention; Fig. 2 is an elevation similar to Fig. 1, with certain parts broken away, showing on larger scale portion of the hammerwith the upper die holder and dies carried thereby, the -mandrel being in position for action and the closing die idle; Fig. 3 is a similar elevation of a portion of the swinging head of the upper die carrier with the closing die in position for action and the mandrel idle; Fig. 4 is a section on line A-A of Fig. 1, showing the initial bend in the sheet metal just completed; Fig. 5 is a similar section showing the square tube completed and the consequent change in positions of parts from those shown in Fig. 4:. y i

In said drawings, and particularly in Fig 1, I have shown a sheet-metal bending pres: of ordinary type having housings l, 1, upper connecting leaf 2 supporting the powe driven shaft 3 which actuates the hamme. at through eccentrics or cranks 5, 5 and having between the lower ends of said housings the anvil 6. A lower die holder 7 is mounted upon said anvil in carrying out my invention, said die holder being held central by means of a rib 8 on its base which enters a corresponding groove in the anvil. Said die holder is recessed longitudinally at its upper part, as at 9, to receive the lower die members and adjustable side walls supporting the same. The

side walls

10, 10, comprise heavy strips which stand edgewise upon the floor of the chamber or recess 9, opposite and parallel to each other, and extend to the top of the die holder. Each side wall 10 is adjusted toward and away from the side of the recess 9, by means of screws extending through the side of the die holder and arranged in rows. The middle row of screws 11 are threaded each at its inner end to screw into the side wall, as at 12, and extend loosely through the die holder, having outer threaded ends 13 each of which receives a nut lat which can be tightened to draw the side wall outward. The screws or bolts 15 of the upper and lower rows all work through the die holder and abut against the side wall 10, being provided at their outer ends with heads 16 for turning and lock nuts 17 for holding them in fixed position. Obviously by loosening the nuts 1-1 on the middle row of bolts, the side wall 10 can be moved bodily inward by screwing in the bolts 15 in both the upper and lower rows, or by screwing in one row and screwing out the other row, the side wall 10 can u be rocked slightly, there being enough looselness of parts to permit such movement.

In the middle of the recess 9 of the die holder 7 is placed the middle member 18 f the lower die, said member preferably having at its lower end a reduced extremity 9 entering a groove 20 in the floor of the trecess, and having adjacent to said reduced :edge portion

lateral recesses

21, 21. The pper edge of said die member 18 has a V-shaped groove 22 adapted to fit against {one corner and the two adjacent sides of athe tube to be formed, as shown in Figs. 4

'nd 5 of the drawing. At the sides of said middle member 18 are the

side members

23, 23 each lying between the middle memltber and one of the side walls 10 already described and comprising a strip or bar which it its lower edge is rounded and has a lateral rib 24: extending into the recess 21 of the middle die member 18. Each side member 23 at its lower edge portion substantially fills the space between the side wall 10 and the middle member 18 of the die, but the opposite sides of the side member converge upwardly, so that ,t its upper edge the member is considerably narrow-er than the space between the side walls 10 ber and extend upward from the edge of the groove 22 therein to form a. portion of the next adjacent side of the tube to be produced. The upper edge portions of these

side members

23, 23 of the dies are narrow enough, however, for them to tilt or swing away from the middle member 18 far enough so that said flanges '25, 25 shall clear the groove 22 of the middle :die memher and permit free access for the sheetmetal to be pressed down into saidv groove, as WlllbG hereinafter more fully explained.

Adjustable gages 27 are provided upon the lower die holder '7 to serve as stops in bringing the sheet metal to be bent into proper position.

The hammer 4 has mounted upon its lower edge or face an upper die holder 28 which is longitudinally grooved as at 29 to receive the lower edge of the :hammer and furthermore has straps or arms 30 extending upwardly at the sides of the hammer with outwardly turned upper ends 31 ada ted to receive bolts or screws 32 extending through do s 33 which overlap upon the shoulders .34 of the hammer. In this or any other suitable and well-known manner the said upper die holder is rigidly secured to the hammer, and to the lower part ofsaid holder is pivoted a swinging head 35. This swinging head consists essentially of a shaft 36 which is journaled in bearings 37, withcaps 38 therefor, at intervals of the length of the hammer. Between said bearings the said shaft 36 has integral lateral extensions '39 which provide at one side surface a series of recesses 40 adapted to receive a mandrel carrier 41 secured in said recesses by bolts or screws 42 and being disposed cdgewise radially with respect to the shaft 36. The edge of said carrier next to the shaft has a solid seat against the wall of the recess 40, and its opposite edge is reduced .as at 43 to enter a corresponding groove 44 in the mandrel 45. Said mandrel has a V-shaped lower edge adapted to fit the groove 22 of the middle member of the lower die to shape one corner and two adjacent sides of the tubing "to be made, and the two lateral edges of the mandrel are also V- shapechasat 46, to fittwo other corners of the tube to be made.

At its opposite ends the mandrel 45 has extensions 47, which can be the same for mandrels of all different sizes, and which extensions are adapted to be engaged by

latches

48, 48, one pair at each end of the mandrel carrier 41, said latches serving to hold the mandrel .to the carrier until itis is sufi icient to retain it therein and cause the latches to pull off as the hammer ascends. These latches are best shown in Fig. 5, where 49 indicates a bolt or pin upon which they are pivoted and 50 indicates a spring which draws the latches together into engagement at their:notches 51 with the end extension of the mandrel, as shown in dotted lines in Fig. 4.

The lateral extensions 39 of the swinging head 35 also provide surfaces or sides 52 which are vsubstantially parallel to the surfaces upon which the mandrel carrier 41 is mounted, said surfaces 52 being recessed forced into the lower die, when the friction as at '53 to receive a die closer'54 which projects radially away from the shaft '36 at rightangles to the mandrel carrier 41.

This die closer '54 is channel-shaped with a a rod 61 whichextends along the front of the machine and by means of which the swinginghead canbe swung. In operation, said handle rod 61 is pushed upward, vas shown in Fig. v4, to bring the mandrel carrier 41 with its mandrel 45 directly above the groove 22 of the lower die member. The hammerbeing raised, and a sheet of metal being properly placed upon the lower die member, a downward stroke of the hammer will seat the mandrel as shown in Fig. 4, the side members .23, 23 of thelower die being pushed apart to permit the downward passage of the mandrel and sheet metal. The parts are preferably so adjusted, however, as that the said side members engage the sheet metal opposite the lateral corner edges of-the mandrel 45. and start a sharp bend .thereat so that when the mandrel is seated the portions of sheet metalproiecting above said corners converge upward slightly,

as shown in .Fig. 4. When the hammer .is

elevated again, the mandrel will be left as already described, and then the handle rod 61 is depressed to turn the swinging head 35 into the position shown in Fig. 5, so that the die closer 54; is directly above the lower die member. A downstroke of the hammer will then cause said die closer to engage the upper edges of the

side members

23, 23 of the lower die, and press them toward each other, thus closing the free upwardly extending and already converging sides 66, 67 of the tube being made, as shown in Fig. 5. The hammer is then raised again, the mandrel drawn out of the completed tube and said tube removed.

Preferably some means is provided for securing exact positioning of the swinging head 35 in its two positions, such for instance as shown in the drawings where 69 indicates a ball adapted to project from a bore 70 in the stationary portion 29 of the upper die holder into depressions or sockets 71 in the shaft 36, a spring 72 always tending to project said ball. Obviously, said ball will serve as a detent when it drops into one of the sockets of the swinging head, to position said head, and at the same time, by means of the leverage of the arms 60, the swinging head can be turned by force in spite of said detent, forcing the ball back against the spring 72. As many of these detents may be arranged along the length of the shaft 36 of the swinging head as is desired.

Having thus described the invention, what I claim is 1. In an apparatus of the character descr bed, a lower die holder having a longitudinal channel, side walls in said channel adjustable toward and away from each other. means for adjusting said side walls, a middle die member and side members between said middle member and the side walls, said side members adapted to swing at their upper edges to overlie the middle member or to clear the same. a mandrel, and means for forc ng said mandrel into engagement with the lower die.

2. In an apparatus of the character described, a lower die comprising a middle member and opposite side members eXtending above said middle member and adapted to swing at their u per edges to overlie the middle member. s de walls outside said side members for holding them alwavs in position to cooperate with the middle member in shaping the metal, means for moving said side walls toward or away from each other and holding them fixed when adjusted, a mandrel, and means for forcing said mandrel downwardly to simultaneously shape the metal upon said middle member and side members.

3. In an apparatus of the character described, a lower die holder having a longitudinal channel, side Walls in said channel, screws working through the sides of the die holder into engagement with said side walls to adjust the same, a middle die member in said channel, movable side members between said middle member and the side walls, a mandrel, means for forcing said mandrel into engagement with the middle member, and means for moving said movable side members.

4. In an apparatus of the character described, the combination With a lower die having members adapted to be closed, an upper die carrier having a grooved seat, a swinging head having a longitudinal portion of itself adapted to turn in said grooved seat and bear against the same, a mandrel engaging member and a die closer carried by said head in angularly separated positions, means for swinging said head, and means for raising and lowering said die holder.

5. In an apparatus of the character described, the combination with a lower die having members adapted to be closed, of an upper die holder providing at its lower part a series of journal bearings, a swinging head having a shaft portion mounted in said bearings and a series of alined lateral extensions projecting from said shaft portion, a mandrel engaging member and a die closer mounted on said lateral extensions at an angular distance apart, means for swinging said head. and means for raising and lowering said die holder.

6. In an apparatus of the character described, the combination with a lower die having members adapted to be closed, of an upper die holder providing journal bearings at its lower part, a swinging head having a shaft portion mounted in said journal bearings and lateral extensions at one side of said shaft portion, said lateral extensions providing longitudinal seats separated angularly, a mandrel engaging member and a die closer mounted in said seats, and means for swinging said head to bring either said mandrel engaging member or die closer into alinement with the lower die.

7. In an apparatus of the character described, a lower die comprising a middle member having an undercut recess, an adjustable side wall at a distance from said middle member, a side member between said middle member and side wall, said side member having a lateral rib e tending into the undercut recess of the middle member, and means for swinging the side member toward said middle member.

8. In an apparatus of the character described, a lower die comprising a middle member having undercut recesses on its opposite sides, adjustable side walls at a distance from said middle member, side members between said middle member and side walls said lit) side members having lateralribs extending into the undercut recesses of the middle member,-and means for swinging the side members toward said middle member.

9. In an apparatusof the character described, a lower die comprising a middle member having undercut recesses on its opposite sides, adjustable side walls at a dis tance from said middle member, tapered side members between said middle member and side walls said side members having lateral ribs extending into the undercut recesses of the middle member, and means for swinging the side members toward said middle member.

10. In an apparatus of the character de scribed, a lower die comprising a middle member and opposite side members adapted at their inner edges to overlie'said middle member and being beveled at their outer edges, means for holding said side members always in position to cooperate with the middle member in shaping metal, a mandrel, means for forcing said mandrel into engagement with the middle member and side members simultaneously, and a closer above the lower die having flanges with converging bevels overlying said side members of the lower die and adapted to engage said beveled edges and press said side members toward the mandrel.

11. In an apparatus of the character described, the combination. with a lower die having members adapted to be closed, an upper die carrier having a grooved seat, a winging head having a longitudinal portion of itself adapted to turn in said grooved seat and bear against the same, a mandrel engaging member and a die closer carried radially by said head in angularly separated positions, means for swinging.

said head, and means for raising and lowering said die holder.

'12. In an apparatus of the character described, the combination with a lower die having members adapted to be closed, of an upper die holder providing at its lower part a series of journal bearings, a. swinging head having a shaft portion mounted in said bearings and aseries of alined lateral extensions projecting from said shaft portion, a mandrel engaging member anda die closer mounted on said lateral extensions at an angular distance apart, arms at opposite ends of said swinging head, means connecting the free ends of said arms whereby the operator may swing said arms, and

main

means for raising and lowering said die holder.

13. In an apparatus of the character described, the combination with a lower die havingmembers adapted to be closed, of an upper die holder providing journal bearings at its lower part, a swinging head having a shaft portion mounted insaid journal bearings and lateral extensions'at one side of said shaft portion, said lateral extensions providinglongitudinal seats separated angularly, a mandrel engaging member and a die closer mounted in said seats, means for swinging said head to bring either said mandrel engaging member or die closer into alinement with the lower die, and "means for retaining said head in either position.

1 1-. In an apparatus of the character described, thejcombination with ;a lower die having members adapted to be closed, of an upper die holder providing'journal bearings at its lower part, a swinging head h'aving a shaft portion mounted in said journal bearings and lateral extensions atone sidetof said shaft portion, said shaft'portion providing sockets and said lateral extensions providing longitudinal seats separated angularly, a'mandrel engaging member and a 8 die closer mounted in said seats,m-eans for swinging said head to'bring either said mandrel engaging member or die closer into alinement with the lower die, and means adapted'to enter said sockets for retaining said head in either position.

15. In an apparatus of the character described, the combination with a lower die havingmembers adapted to be closed, ofan upper die-holder providing journal bearings at its lower part, a swinging head having a shaft porti-on mounted in said journal bearings and lateral extensions at one side of said shaft portion, said shaft portion providing sockets and said lateral extensions 'providing longitudinal seats separated angularly, a mandrel engaging member and a die closer mounted in said seat, means for swinging said head to bring either saidmandrel Vengaging member or die closer into alinement with the lower die and a spring actuated ball in said upper die holder adapted to enter said sockets for retaining said head in either-position.

IL-LIAM F. BUR-DITT, J

lVitness'es:

RUSSELLJYL EVERETT, Howauo P. KING.

Copies of this patent may be obtained for five cents each, by addressing theCommissioner of Patents, Washington, D. G,