US422944A - Device for folding sheet-metal plates - Google Patents

Description

(N0 Model.) 2 Sheets-Sheet 1.

' W. G. HYNDMAN, DEVICE FOR FOLDING SHEET METAL PLATES.

No. 422,944. Patented Mar. 11, 1890.

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2 N A M D N Y H G W DEVICE FOR FOLDING SHEET METAL PLATES. No. 422,944,

Patented Mar. 11,1890.

N. PETERS, Pholo-Lithngmpher. Washington. D. Q

UNITED STATES PATENT OFFICE.

\VILLIAM GRAVES IIYNDMAN, OF CINCINNATI, OIIIO.

DEVICE FOR FOLDING SHEET-METAL PLATES.

SPECIFICATION forming part of Letters Patent No. 422,944., dated March 11, 1890.

Application filed December 26, 1889. Serial No. 335,008. (No model.)

To all whom it may concern:

Be it known that .I, \VILLIAM GRAVES HYNDMAN, a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Devices for Folding Sheet-\lctal Plates; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, and to the let-- ters of reference marked thereon.

This invention relates to certain new and useful improvements in machines for folding or bending sheet-metal plates; and it has for its object, among others, to provide a machine of this character which, after making the fold, will be turned back into its original position ready for more work, releasing itself from the metal sheet or plate, clearing the foldmade without moving the sheet or plate and without turning the same.

It aims also in novel features of construction, which will be hereinafter described more fully, shown in the drawings, and then particularly pointed out in the appended claims.

The invention is clearly illustrated in the accompanying drawings, which, with the let ters of reference marked thereon, form a part of this specification, and in which- Figure l is a top plan of my improved machine. Fig. 2 is a side elevation or longitudinal section through the same, with the parts shown in full lines in the position they assume before bending the sheet or plate. Fig. 3 is a like view showing in full lines the position the parts assume after bending the sheet or plate.

Like letters of reference indicate like parts throughout the several views.

Referring now to the details of the draw ings by letter, A designates a suitable bedplate for supporting the various parts of the machine. This may be of any suitable ma 'terial and of a size adapted for the purpose.

Upon this bed-plate at one side is a raised bed A, upon which the sheet or plate is designed to rest while being bent. It is provided upon.

bed, near the longitudinal center thereof, are

the raised stops B, the object of which will journaled the ends of the trunnions 1), formed upon curved lines, as shown at c, and which carry the parallel arms D, the outer ends of which are connected by a cross-bar E, pref erably round andwhich serves as a handle by which the device is operated. The trunnions are preferably formed of a hollow pipe, to which the parallel arms are secured by a screw-thread engagement, so that they may be readily connected or detached when de sired, and the end of the curved portionforms a convenient stop for the sliding bracket hereinafter described.

F is the bending-bar, provided along its acting edge with a recess (1, to receive and hold the edge of the sheet or plate to be bent, as shown best in Figs. 2 and 3. preferably formed between the bar and a metal plate secured to the upper face thereof, as shown; but it may otherwise be formed, if desired. Upon the ends of this bending bar are cast or rigidly secured the brackets G, in apertures in the ears of which the par allel arms D are designed to loosely Work, the said arms being provided between the ears with a stop-pin e, as shownin Fig. 1.

H are coiled springs around the arms D, between the outer ears on the brackets G and a retaining pin f on the said arms.

I are lugs on the crossbar E, one near each end thereof, and J are corresponding lugs on the bending-bar F. K are toggledevers pivotally connecting the said lugs, and one arm of the toggle is made adjustable by means of a turn-buckle L.

M are cam plates on the upper face of the bed A, as shown in all the figures of the drawings, and the object of which will soon appear.

In operation the parts are normally in the position in which they are shown in Fig. 1 and in full. lines in Fig. 2. The sheet or plate N to be bent is then placed. upon the raised bed with its edge entered in the recess in the bendingbar, as shown in Fig. 2. The

togglelevers are at this time straightened. The bending-bar is then brought over into This recess is the position shown by full lines in Fig. 3, the

metal being bent as indicated in said Fig. 3. In the further movement of the parts the toggles come in contact with the tops of the stops B, and the toggles are thus raised, allowing the springs to draw the bending-bar away from the bent end of the sheet or plate. The parts are then thrown over into their normal position, and when thus thrown the toggle-levers come in contact at their joints with the cam-plates M on the bed-plate, as shown by dotted lines in Fig. 3, and the toggles are straightened in the further movement of the parts and the springs on the arms D are compressed. The stop-pin e limits the movement of the arms in the direction of their length.

It will thus be seen that the device is antomatic in its action. As soon as the sheet is bent the toggles are raised, the springs draw the bendingbar away from the bent sheet, and as the parts are thrown back away from the sheet the toggles are again automatically straightened ready for work, and, the bent sheet having been removed and another placed in position, the operation may be repeated.

Various modifications in detail may be resorted towithout departing from the spirit of the invention.

W'hatI claim as new is 1. The combination, with the bending-bar and the operating-arms, of toggle-levers conneeting the bar and arms and stops for breaking the levers after bending the metal, as set forth.

2. The combination, with the bendingbar bar and arms and stops for automatically raising and straightening the levers, as set forth.

4. The combination, with the bending-bar and the spring-actuated arms connected therewith, of the toggle-levers pivotally connected to the bar and arms, the stops B, engaging said levers to break them after forming the fold, and a cam arranged to straighten the toggles as the parts are thrown into their normal position, as set forth.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

7M. GRAVES HYNDMAN.

Witnesses:

OLIVER 13. J ONES, J OHN J. SULLIVAN.

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