US118920A - Improvement in bending-machines - Google Patents

Improvement in bending-machines Download PDF


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US118920A US118920DA US118920A US 118920 A US118920 A US 118920A US 118920D A US118920D A US 118920DA US 118920 A US118920 A US 118920A
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    • B21D5/00Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/04Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work


N0. 118,920 Patented Sep. 12,1871;
Specification forming part of Letters Patent No. 118,920, dated September 12, 1871.
To all whom t may concern:
Be it known that I, JOHN FORBES, of Halifax, in Nova Scotia, Oanada, have invented a new and Improved Bending-Machine, and 1 do hereby 'declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the sa1ne,ref erence being had to the accompanying drawing forming part of this specification.
My invention relates to machines for clips, scabbard-joints, and railway-chairs; and consists in the combinations hereinafter fully described and subsequently pointed out in the claims.
Figure 1 is a plan view of the machine, except one of the cam-shafts, and a holdin g-jaw or lever detached to exhibit the parts below more clearly. Fig. 2 is a longitudinal sectional elevation taken on the line a' a; of' Fig. l. Fig. 3 is a side elevation. Fig. 4 is a section on the line y y of Fig. l. Fig. 5 is a section on the line z z of Fig. 1, and Fig. (i is a section on the line vw w, Fig. 4.
Similar letters ofreferencc indicate corresponding parts. A is the bed-plate or frame of the machine, and consists of a heavy casting having side risers or standards A projecting upward for the purpose of sustaining the various working parts, and having two heavy ribs, A, depending from it on the under side for the purpose of strengthening it in the direction in which it will be called upon to resist the st 1ain brought upon it by the action of the machine when at work. L is a transverse piece, strongly bolted to the main frame, carrying the main drivingshaft O, in bearings, as shown in section at O, Fig. 4. L is a carriage, fitted to slide upon the transverse piece L, and bored to allow the end of' shaft O to revolve and slide freely in it, or rather to allow the carriage Ll to slide upon the shaft, the shaft O revolving, but having no endlong motion. i is a wroughtron pinion keyed upon the shaft O, just outside the bearing in transverse piece L. C O are pulleys, the inner one being keyed to shaft O, and the outer one revolving freely upon it to run the belt onto for the purpose of stopping the machine. t is a balance-wheel, also keyed to shaft (l, to steady the power and for obvious purposes. j" is a spur-wheel, gearing into pinion t', and being keyed upon one of two shafts carrying )inions f, one of the said shafts projecting outward from transverse piece L sufficiently to receive it. G G are two larger spur-gears, gearing into the pinions f, as shown in the side elevation, Fig. 3, the pinions f gearing into each other and into G G, so that motion being given to pinion t' the spur f', through the intervention of pinions j', will transmit motion to spurgears G G and cause them to rotate in the directions indicated by the arrows in Fig. 3. B B are two cam-shafts, working in bearings provided for them in the frame A. These cam-shafts are precisely alike, and each carries five cams-wiz., two pairs, as a a., a. a', and a, the last named being centrally located upon the shafts, and the others, one of each pair, on each side of it. These cam-shafts project from the frame of the machine, and are turned and fitted to receive the spur-gears G G, which revolve freely upon them. It should be mentioned that upon these projecting ends, as named, are formed heavy collars, in which are provided the means of connecting the spur-wheels G G with the cam-shafts B, when desired, by locking-pins P, which may be actuated in any approved way. D D are rocking frames working upon centers passing through the side walls of frame, as seen at d d, Fig. 5. E E are the bending-jaws or levers. These levers are sustained in the rocking frames D, a shaft passing through both frames and levers, as shown at c, in section, Fig. 5. To ascertain the shape of these levers reference will need to be made more particularly to Fig. 2. A roller, c', is bored -and fitted to revolve upon the shaft c in a recess provided at the forked ends of levers E. c c are two smaller rollers, working in suitable recesses in the extreme ends of' levers E. H are jaws or levers situated above those just described, and working in other centers (1.', Fig. 5, these may be termed holding-down levers. H are shoes screwed upon the outer ends of levers H, and admitting of adjusting by a screw above them, as clearly shown in the Figs. 2 and 3. The other ends of levers H have fitted and screwed firmly between them bearing-pieces H for holding down the mandrel J, upon which the clip is formed. F are shoes or cam-shaped blocks screwed upon the bed of machine, one under each roller c c of levers E, the rollers e c, when -the machine is in action, being caused to roll upon them. W are weights or counter-balances, which, by means of the bars upon which they are situated, cause the several working parts or levers to return to their original position after each operation. W' are springs, which operate upon the ends of le- I is not fully shown in any of the figures, being vers E for the same purpose. In the plan view, Fig. l, one of the cam-shafts B is removed to show more clearly the ends of levers E, the large spur-wheel and collar upon the shaft being retained. The mandrel upon which the clip is bent broken off, and the end only shown at j', and a part shown in plan, Fig. 1. It is held in place by a staple, N', passing over it and into holes formed in the piece upon which it rests, said piece constituting the cap for bearing of shaft C.
lt must be borne in mind that both ends of this machine as divided are counterparts of each other, and, being mutually set in action by the shaft C, work simultaneously.
The action of the machine is as follows: The mandrel being in its place and a plate of steel or iron of the proper size for the intended clip being introduced between the mandrel and the transverse piece or rest L' of the machine, the large spur-wheels are brought into connection with the cam-shafts (for which any suitable means may be provided) and cause them to revolve inward, as shown by the arrows in view 3. The first action of the cam-shaft is to raise the outer ends of holding-down levers H, the cams a bearing upon their shoes H', depressing` their inner ends, and causing the piece H" between them to bear upon the mandrel, pressing it down upon the plate. The cams al' a' next come into play, and these, acting upon the rollers in the forked ends of levers E, depress them and so raise their inner ends. This, it is obvious, will bend up the plate somewhat in shape of the letter U, the cam-shafts continuing their revolution. The middle or main cams a" are next brought into action, and these, bearing against the rollers e" working upon the same shafts with the bending-levers, press them forward, thereby rocking forward the frames D in which they swing the small rollers in the tails of bending-levers at the same time coming in contact with the curved blocks F on the bed of the machine, and being caused to roll upon them, produce a motion of the inner ends of levers E downward as well as forward, and the inner ends of said levers being of proper shape will, by the action thus described, produce a shape in the plate corresponding with that of the mandrel upon which it has been bent. This result having been obtained and vthe cam-shafts having completed a whole revolution each, the various levers and working parts are returned to their original positions by meansv of counterweights W and springs W', in the several figures.
The clip now being bent, I will proceed to describe the mode of withdrawing it from the mandrel upon which it has been formed. The pushing-off device is clearly shown in section in Fig. 4,'in which'it'will be seen that the main driving shaft C extends entirely across the machine, and has a screw formed upon it, a plain piece being left at the extreme end which flts and revolves in a hole bored through the carriage L', shown clearly in section, Fig. 4, the shaft being made to revolve in a bearing formed in the transverse piece L, and extending beyond to receive the small pinion fly-wheel and driving-pulleys for giving motion to the machine. K is a smaller shaft,'workin g in carriage L', a hole being bored to receive it, projecting from it on the front of the machine, and tted with a handle, k; the other end extends through the carriage and is i'latted, being about half an inch thick and one and a half inch in width, the end outside this iiatted portion turning in a hole in a plate attached to the end of carriage L'. K' is a wroughtiron box, or rather two sides and bottom of a box, in the upper part of which and firmly secured to it, as shown at m, Figs. 4 and 8, is one-half of a brass nut, cut to fit the screw-thread upon the shaft C; the other half of this nut is placed in the lower part of the box, and is made to slide freely, so that, if not prevented, it will fall away clear of the screw on the shaft C. n u are spiral springs, of steel, with their lower ends resting upon aplate provided with pins to receive them, and their upper ends bearing against and tending to lift the box K', with the upper half of nut, away from the screw-shaft C. The atted end of the small shaft K, previously described, being situate between the bottom of the box K' and the lower haltl of nut m Fig. S, it is obvious that when the shaftKis turned upon its bearings by means ofthe lever-handle on its front end, so as to place the iiatted end edgewise between the parts just described, its effects will be to press down the box with the upper half of the nut, and also to push upward the lower half of the nut, and cause the nut to it and embrace the screw on shaft C. The shaft C being revolved will produce an endlong motion of carriage L'. N is a piece fitted securely to the top side and near the end of carriage L', which embraces and slidesY freely upon the mandrel J, upon which the clip, is formed; this endlong motion of the carriage presses the piece N against the end of the clip, and, the mandrel being prevented from moving by the staples i the clip is pushed from the mandrel, after which, by changing the position of the shaft K by means of its handle, the half nuts will fall away from the shaft, when the carriage may be slid along to its original position and made ready for use again.
I do not confine myself to the use of this machine for bending clips or chairs only, as it may also be used for bending metal for other purposes with profitable results. Neither do I confine myself to any particular shape of clip or joint.
Having thus described my invention, I claim as new and desire to secure by Letters Patentl. rlhe combination of mandrel J, rest L', and holding-levers H H" with bending-levers E, operating as and for the purpose speciiied.
2. The combination of cams a", rocking frames D, and stationary cams F with the levers E, as and for the purpose specied. I
3. The combination of shaft c', divided nut m m', carriage L', stripper N, and shaft K, as and for the purpose specified.
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