US27568A - Machine fob bending wood - Google Patents

Description

UNITEDv SA A FDE.,

ARTEMAS ROGERS, OF PAINES'VILLE, OHIO.

MACHIE FOR BENDING WOOD.

Specification of Letters Patent No. 27,568, dated March 20, 1866.

To all whom it may concern:

Be it known that I, AirrEMAs ROGERS, of Painesville, in the county of Lake and State of Ohio, have invented a new and useful Machine for Bending Wood; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, and the letters of reference marked thereon, making a part of this specification, in which-- Figure l is a top view and Fig. 2 a perspective.

The nature of my invention, consists in the employment of a pair of vibrating segmental formers, to produce a single bend or curvature in a piece of timber, and the method of operating the said formers, so that they not only bend the timber, but at the completion of the process constitute the mold, having a continuous curvature.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

A A is any suitable frame, upon which is secured the table B B having the slots V, V, and S.

O O are the pair of formers or partforms, each part being a segment of such length and curvature, that by uniting their adjacent extremes, as is done in each operation, they constitute a form or mold of the length and curvature desired; and each having two strong pins z' and j projecting from its under surface; one at its axis and the other at the rim, midway between its extremes, as shown in Fig. 3, which traverse the slots V, V, and S, for the purpose of guiding and controlling their movement so that notwithstanding the contraction of the bending timber, they shall not come in collision before the completion of the process; at which time they will unite the inner extremes of their peripheries and constitute one continuous form. The formers C O are also provided with cogs at the bottom of their outer peripheries, which gear into the rack R R, for the purpose in connection with the slots and guide pins described above, of securing greater regularity and exactness in their vibration.

The rack It R has its recesses closed on the upper side to preventthe formers O C from rising up during the o-peration. The nuts o 0 on the ends of the movable fulcra or guide pins z' c' are for the same purpose.'

u 'u are clamps which are permanently secured, one at each outer extreme of the formers c c, for securing the two ends of thetimber.

K is a strap of band iron which is placed back of the timber and made fast with it in the clamps a a, by the set screws z it, preparatory to bending.

Immediately back of the timber with its strap K, is the ledge L, for the purpose of retaining the rectilinear position of the unbent portion of the timber, until every successive part is subjected to the action of the formers O O.

D D are two windlasses, geared together by the cog wheels e e, and m m are their ropes or chains, attached to the hooks @c w.

P is a pawl which catches and holds the windlasses D D as they are turned in operating the machine.

The operation of my machine is very simple. All the parts being properly adjusted as described; by turning the windlasses, D of the two formers O C. Then as the bending toward each other upon their movable fulcra z' z' causing both ends of the timber to begin simultaneously to bend, as shown in Fig. l, and by continuing the process, the formers will unite their inner extremes thus completing the mold, and giving to the timber the desired curvature.

The most important advantages secured my invention are these. First by commencing at both ends of the stick at the same time and terminating in the middle I obviate the liability of splitting or shooting out of the inner portion of the wood at the ends: (the general defect of machines which terminate at one or both ends,) second: I produce any necessary traction longitudinally of the grain of the wood during the process, which is the most essential element in the art. By this the timber is held perfectly tangential to the formers, and drawn so tightly between them and the strap as to allow of no fracture and prevent any wrinkling of the inner surface; thus compelling a continuous upsetting of the bersof the wood without destroying its texture. The manner in which this traction is effected will be understood if we consider that the timber before bending is equal in length to the united peripheries of the two formers C O. Then as the bending continues there must be a constant sliding of the formers on the surface of the timber toward its ends equal to the upsetting; and

Q 27,568 e. l

the traction will be equal to the force reof timber, When s'o arranged and controlled 10 quired to overcome the friction caused bythe as to commence simultaneously at both ends clamping. of the stick to bend it, and by the completion Having thus fully described the nature and of the process, constitute the mold, having a. 5 operation of my invention, what I claim as continuous curvature.

new therein, and desire to secure by Letters ARTEMAS ROGERS. 2 Patent, is- Witnesses:

The employment of a. pair of Vibrating W. H. BARRIss, segments to produce a. single bend in a piece H. STEELE, J r.

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