US649996A - Machine for forming sheet-metal tubes. - Google Patents

Description

Patented May 22, 1900.

A. SCHWABTZBAUER; MACHINE FOR FOBIMNG SHEEI METAL TUBES.

(Application filed Feb. 28, 1900.)

3 Sheets-Sheet I No. 649,996. Patented May 22, 1900.

A. SCHWARTZBAUEB.

MACHINE FOR FORMING SHEET METAL TUBES.

\ (Application filed Feb. 26, 1900.) (No Model.) 7 3 Sheets-Sheet 2.

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MACHINE FOR FORMING SHEET METAL TUBES.

(Application filed Feb, 28, 1900.)

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ANTONSCHVVARTZBAUER, OF PHILADELPHIA, PENNSYLVANIA.

MACHINE FOR FORMING SHEET-METAL TUBES.

SPECIFICATION forming part of Letters Patent NO. 649,996, dated May 22, 1900.

Application filed February 28, 1900. Serial No. 6,787. (No model.)

To all whom it may concern: r 7

Be it known that I, ANTON SCHWARTZ- BAUER, a citizen of the United States,residing at No. 1838 South Fifth street, in the city of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and usefulImprovements in Machines for Forming Sheet-Metal Tubes, of which the following is a specification.

My invention has relation to a machine for forming sheet-metal tubing, and in such connection it relates to the construction and arrangement of such a machine.

The principal object of myinvention is to provide a machine whereby sheet-metal tubing, whether of cylindrical or tapered form, may be easily and quickly made; and to that end my invention consists, essentially, of a machine provided with mechanism for lapping the edges of lthe sheet metal to form a locking means for the tube, mechanism for bending the lapped-edged sheet into the tubular form required, and mechanism for finishing the bent tube.

My invention further consists of a machine for making sheet-metal tubing when constructed and arranged in substantially the manner hereinafter described and claimed.

The nature and scope of my present invention will be more fully understood from the following description, taken in connection with the accompanying drawings, forming part hereof, in which Figure 1 is a perspective view of a machine embodying main features of my invention.

Fig. 2 is an end elevational view of the righthand end of the machine. Fig. 3 is a longitudinal sectional View of Fig. 1. Fig. 4 is an enlarged longitudinal sectional view illustrating in detail the mechanism for lapping the edges of the sheet. Fig. 5 is a similar 'view illustrating in detail the mechanism for bending the lapped sheet into substantially tubu- Fig. 6 is an enlarged view of Fig. 3, illustrating the means for adjusting the guide bar or plate. Figs. 7, 8, and 9 are perspective views of respectively the sheet, the partly-formed tube, and the formed tube of cylindrical shape; and Figs. 10 and 11 are perspective views of respectively a sheet and a tapered tube formed therefrom.

Rcferrin g to the drawings, a represents the supports, and ctthe bed-plate, of the machine. At the left-hand end of the machine is hinged a brake or folding bar {1), and on the bedplate a, immediately in front of the folding' bar 1), is located a die-plate d. The die-plate d has a beveled edge d, which is separated from or raised above the bed-plate by means of a removable gage-plate 01 In the space d thus formed the edge of the sheet A is adapted to be inserted, as clearly illustrated in Fig. 4. It will be readily understood that the depth of the space 01 will depend upon the thickness of the gage-plate 0F, and hence by interposing plates 01 of varying thickness between the die-plate d and the bed a of the machine the space at may be regulated to accommodate sheets of varying thickness of metal. The beveled edge d projects beyond the front edge of the gage-plate d to a distance corresponding with the width of the lap required, and to permit of the variation in this width of lap the gage-plate d is made adjustable between the bed of the machine and the die-plate d by slotting the plate d as at C1 and passing set or fastening screws d through these slots and through the die-plate d and into the bed-plate a. After the sheet A has been provided at two opposite edges with a lap the sheet is then bent into required form by the bending mechanism. This mechanism is arranged at the other end of the table, and consists of a round bar or mandrel 6; one end of which is pivoted, as at e, in a projecting bracket 6 extending from the side of the bed-plate a. The other end of the mandrel e is adapted to enter a bracket 6 and to be locked therein by a bolt e as clearly illustrated in Figs. 1 and 2. Adjacent to that edge of the table at which the mandrel Z is located is arranged a bending-frame consisting of two or more pivoted arms f, the lower ends of which are curved, as at f to fit concentrically over the bar or mandrel'e. These arms f carry a fiat strip f and have at their upper end a common handle f Below the mandrell is located a gage-plate g, upon which the lapped edge of the sheet is adapted to rest and also upon which the lapped edge is guided. This gage-plate g is united to the side of the machine by preferably two bolts g, each passing through a slot 9 in the side of the machine and arranged in such a manner as that the and upon the bedthe'r'eof arere'movably 'secured the finishing mandrels orformers m and n,- of which mis substantially cylindrical- The operation'of the machine hereinbefore Q upper edge of the plate 9 may either rest parallel with the mandrel e or'be turned so that it shall rest at an oblique angle to either, end of said mandrel. When tilted to its oblique position, the gage-plate g is adapted to be locked by means of a peg passed through, either the opening 9 or 9 arranged ateither end of the gage-plate g and adapted, respectively, to register when that end is tilted 'up-j' ward with a similar'opening in the side of the machine. 7

At the front and. rear sides .of the machine throughout its length, while the mandrel n is tapered. 3

explained is "as follows: The opposite sides ofthersheet A'are first formed with the laps A and Afladapted when the sheet is bent around to interlock, as illustated in Figs. 9 andli. When a eylindrical or straight tube isto be formed, the sheet A is oblong, as illustrated 'in- Fig. 7, but when the tube is ,to be of tapered form the sheet is 0f the form' illustrated in Fig. 10. After the lapsA' and A have been :formed'by the brake b, as previously explained, the sheet is removed to the bending mechanism. In this portion of the-machine the "lapped edge A is first inserted between the mandrel e and the side of I the machine until it rests on the gage-plate g. l'lvhe arms f-and strip f are then moved downward from a vertical to a horizontal position and the sheet is partly-bent or curved,- as illustrated in Fig. 5, being forced down upon the curved mandrel 'by the curved portions of-thearms f and spread elosely over thet-mandrel by-the lower edge of the strip f The partly-bent sheet" is then removed from the mandrel e by swinging the mandrel andsheet away from the side of the tube.

Theiotherllapped edge A is next inserted betweenthe mandrel e and the side of the table cisely the same, as above explained, but the gage-plate, 9 must be tilted after each bendin g operation to an'opp'ositeinclined position. Havingthus described the nature and object of my invention, what Iclaim as new, and

desire to secure by-Letters Patent,"is-- 1; In a machine of the character described, a bendingmeeh'anism, comprising abendingframe hinged at its .lowerend to the bed of the machine and curved at that point, a flat strip located adjacent to and above thecurved portion of said frame, a mandrel pivoted at oneendof the machine adjacentto the bending-frame, means for locking the other end of said mandrel to the end of the machine and a gage-plate located'between said frame and mandrel and below the same, substantially as and for the purposes described.

' 2. Ina machine of the characterdescribed, in combination with a bending-frame, a mandrel pivoted atone end of the machine ad- 'jacent to one end of said frame, means for lockingth'e other end of said mandrel so that said mandrel shall rest parallel with said frame, a gage-plate located below the mandrel,---and' means for tilting said gage-plate obliquely to either end of said mandrel,fsubstantially as and for the purposes described. In testimony whereof I have hereunto set mysignature in the presenceof twosubscribing witnesses. V

v ANTON SCI-IWARTZBAUER. Witnesses:

J. WALTER DOUGLASS,

THOMAS M. SMITH.

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