US87981A - Improvement in wood-bending machines - Google Patents

Description

Stanza A. G. SNYDER, OF ASHTABULA, CHIC).

Leuerspazent No. 87,981, ama Ma/r'ch 16,1869, Y

To all whom it may concern Be it known that I, A. G. SNYDER, of Ashtabula, in the county of Ashtabula, vented certain new and useful Improvements in Wood- Bending Machines; and I do hereby declare that the followingis a full and complete description of the seam, reference being had to the accompanying drawing, making a part of this specification, in which-` Figure l is aftop view of the machine.

Figure 2 is a side view. l

Figure 3 is an end view. Y

Like letters of vreference refer to like parts In fig. 1, A are sills, across which. are secured the beams, or cross-ties B.

These beams and sills constitute the frame ofthe machine, ou which the thills are bent, as will hereafter he shown.

O, fig. 2, is a bed, on one end of which is secured an abutment-shoe, D, and on the opposite end is a head, or an abutment, E, through which is projected a screw, F, working in a nut, a. The end of said screw is provided' with a jam-plate b.'

To the shoe-abutment D is attached va plate, or strap of metal, G, the opposite end of which terminates in a hook, and fastened or hooked on to the' loop H, said loop being firmly secured to the bed C.

-It-will be observed that the end of the strap G is thickened up by the addition of ajam-plate, G', forming the hook referred to., d

J is a yoke,secnred to the strap byla loop, Ka

Having thus described the construction and arrangement of the machine, Il will now`proceed to show the practical operation of the same.

y It well known, that in bending timber, there is an vextension and contraction ofthe wood, the inner curvature being contracted, or crimped, more or less, and the outer curvature suffering a corresponding eXtension. In consequence oi' this extension of the wood, the bre is very liable to tear asunder, splintering and breaking, or irregularly bending, at the point of greatest curvature.

In order to prevent this extension of the wood, and cause thebending to be the result o f the contraction of the inner curvature,`and thereby save the loss consequent on the breaking of the work, I confine that section of the timber to be bent, between end-abut- .,ments, said abutments receiving the end-pressure, the consequence ofthe extension ofthe wood.

Thus, in iig. l, A represents a thill, or shaft to be bent. This is laid upon the bed O, with the inner end embraced by and resting against the slice-abutment D, whereas the outer end is secured by the abutment B', .said abutment being fixed to a strap, O', lying along against the end of the thill, the abutment being made to pass around the end. A

and State of Ohio, have in-k tween the shoe and first binder c.

When the thill is thus laid out upon the bed, the screw F is turned down, thereby bringing astrong pressure endwise upon it, the effect of which will be to canse the thillto bend upward from the middle. To prevent this deflection ofthe thill at that point, binders care lixed across it, so that if the thill bends, it must do so belhe thill is prevented from pushing forward, on the application of the screw, by the strap being hooked to the loop H.

The tension thus given to that part of the thill, is retained, by the strap G being clamped to the thill, by the insertion of the wedge H in the yoke J under the plate J The said plate in its capacity, acts as a lever, and the wedge being driven under it, the thill and strap are rmly secured together, retaining thereby whatever amount of deilection the thill may have received in consequence of the application of the screw.

The outer end of the thill is in like manner secured to a strap, O', the end abutting in the angle B of the same, against which the jam-plate b engages.

The strap and thill are then bound together by the yoke e, keyed up by the wedge f,

In this condition, the thill is taken from the bed, and the end inserted in the foot of the former N, so that the strap G will be upward, and which is then bent over the former, down upon the cross-ties B, and secured there by the binders h.

The outer end of the thill is curved by the former o being driven between them, and forcing them outward against the shoulders P.

By the application of the straps, in the manner as described, the wood is prevented from splintering, for the reason that the strap and clamp prevent any ex` tension of the wood while being bent; hence there can be no tearing apart of the fibre, the bending being effected by the construction or upsetting of the inner curvature of the bend.

I am aware that end-abutments have been used in wood-bending machines, for v the purpose of resisting the end-pressure' consequent on the extension of the timber, but these have been used in machines for bending felloes, or other work, when the entire length of vthe stu is bent, instead of one end, or the ends only, as in the shaping of a buggy-thill; hence the application of end-abutments, broadly, I do notclaim.

What I claim as my improvement, and desire to secure by Letters Patent, is

The abutment-shoe D, strap G,jamplate and hook G', yoke J, plate J and wedge H, all constructed and arranged to operate in combination with the loop H and bed O, for thepurpose specied.

' A. G. SNYDER.

Witnesses: f

W. H. BURRIDGE, J. HOLMES.

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