US654075A - Saw. - Google Patents

Description

Patented luly I7, |900.

c. T. REDFIELD.

SAW.

(Application f11ed`Apr. 18, 1900.)

Wl TNE SSE S A WOR/VE YS Noam PETER: ca., PMoYQLlmO., wnsmncmu n c CHARLES T. REDFIELD, OF GLENHAVEN, NEW YORK.

SECIFIOATION forming part of Letters Patent No. 654,075, dated July 17, 1900.

Application filed April 18, 1900.

To all whom it may conceit/Lf l Be it known that I, CHARLES T. REDFIELD, residing at Glenhaven, in the county of Cayuga and -State of New York, have invented certain new and useful Improvementsin Saws, of which the following is a specification.

My invention is an improvement in saws; and it consists in certain novel constructions and combinations of parts, as will be hereinafter described and claimed, whereby the frame of the saw will be given the desired firmness and rigidity when tightened for use.

In the drawings, Figure l is a side elevation, and Fig. 2 a top plan View, of my saw. Fig. 3 is a detail cross-section on about line 3 3 of Fig. l. Fig. 4 is a detail perspective view illustrating the means for tightening the saw-blade. Fig. 5 is a side view,partly broken away, of a somewhat-different construction from that shown in Fig. l; and Fig. Gis a detail cross-section on about line G 6 of Fig. `5.

The handle-bar A and the front bar B Aare provided at A and B' with sockets for the ends of the arch and with mortises A2 and B2 for the tenoned ends of thel brace-bar, as shown in Fig. l.

The arch-bar C is curved from end to end, rising at its center, and is provided at its ends with the tenons C', which tit in the sockets A' and B', and the shoulders C2 at the base of said tenons, which shoulders bear squarely against the handle and front bar. l

The brace-bar D is straight from end to end, rests at its center squarely against the crown of the arch-bar, is positively and rrnly secured to the arch-bar at such center and crown, and is held at its ends positively to the handle A and front bar B by means ofthe pins E, which extend through the parts A and B and through the'tenons D', formed at the ends of the brace-bar B and tted in the mortises A2 and B2, as will be understood from Figs. l and 2.

The central connection between the arch C and the brace-bar D is preferably effected by means of a rivet I, which is passed upwardly through the arch-bar C, thence through the brace D, and riveted to unite the parts firmly together, as will be understood from Fig. l.

I refer to the bar D as a brace because it serves such purpose not only with respect to the handle A and front bar B, but also with sehn No. 13,326. (No mod-e1.)

respect to the arch @,as in the operation, more fully described hereinafter, the brace-bar prevents the said arch from moving upwardly at its crown by reason of the direct tensile strain on the bar D, and such bar also prevents the arch from any forward or backward movement relative to the barD and from any movement at its ends, thus' preventing any racking of the frame or any carrying down, up, or out of the said arch, preserving the arch and the bar D, together with the handleA and front bar B, in true alinement.

The ends of the handleA and bar B below the arch C support the blade F, which connects said parts and is provideduwith means whereby it can be` strained longitudinally. As shown, the blade F is pinned to the handle A at F' and is provided at its 'opposite end with a bolt G, which is slit at G' to embrace the end of the blade F and is pivoted or riveted to said blade at G2. This bolt Gr eX- tends through an opening Gr3 in the bar B and receives the washer H' and the winged nut H, by which the blade can be tightened in the frame to any desired degree.

In the operation of my invention it will be seen the bar D and iarch C are secured positively together at their centers by the pin I, thus connectingthe said parts firmly together. The pins E are conveniently removable, as is the pin F', so the saw can be readily taken to pieces for convenience in shipment or storage. This, however, is merely incidental to the invention, the main feature of which is the special construction described, whereby the frame of the saw is given thedesired rigidity, as will be more fully described.

In Figs. 5 and 6 I illustrate a somewhat? different construction, in which the arch and brace-bar are secured together at their middles by a cross-pin .I and at their ends in connection with the handle and front bar in substantially the same manner as that shown in Fig. l; but the brace-bar K is of thin metal and ts in a groove or kerf K', cut in the crown of the arch and secured by the crosspin J, as shown in the said figures.

When the parts are assembled, as shown in Fig. 1, and the saw-blade is tightened by screwing up the nut H, the arch C will be compressed and will have a tendency to rise at its crown or center. The same movement ICO which gives the arch an upward tendency operates by the leverage of the handle A and bar B, fulcrulning at Av and B', to give a strong direct tensile strain upon the brace D,

which operates to counteract and resist theY upward thrust of the arch, as will be readily understood. By pinning the brace D firmly to the arch at the center thereof I avoid any tendency ofthe arch to carry laterally out in either direction and prevent any sliding movement of the arch relatively to the brace D. I also by thisconstruction prevent any movement of the joints of the frame and so avoid any racking of the frame and preserve all parts' in true alinelnent at all times.

As before suggested, the bar D is made straight from end to end, so that the strain in tightening the blade F operates to give a direct longitudinal tensile strain to the bar D in such manner as to firmly resist any upward movement at the crown of the arch-bar. It will also be noticed that I make a comparatively-broad dat bearing where the brace-bar bears upon the arch-bar, which greatly aids the stability of the saw and which cannot be secured if the cross-bar D is bent or curved.

In assembling the saw-frame when the ends of the arch-bar are in their sockets and one end of the cross-bar is in its recess B2 or A2 the other end of the cross-bar will rest slightly above and out of aliuement with its recess. So such end of the bar D will have to be depressed slightly in order for it to enter its recess and be secured to the frame-bar. This also increases the rigidity of the frame and enables the saw-blade to be properly tightened by a slight adjustment.

Manifcstly the rivet I may be in the form of a bolt or nut, and the pin E may be in the form of a rivet, screw, or bolt when desired.

It will be noticed that my saw-frame is entirely free of braces or obstructions above the bar D, thus greatly simplifying the saw,

cheapening the same, and at the same time providing a perfectly-solid frame inwhich to tighten the blade.

I-Iaving thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. The saw herein described consisting of the handle-bar, the front bar, the arch engaged at its ends with said handle-bar and front bar and arched upwardly between its ends, the brace-bar made straight from end to end and extended over the arch-bar and in contact therewith at its middle, means securing the ends of the bracebar positively to the bars of the frame, the pin extending verti= cally through the arch at the crown thereof and through the brace-bar and securing such parts rigidly together at their middles, the saw-blade connecting the opposite frame-bars and means for straining or tightening said saw-blade substantially as set forth.

2. A saw comprising the opposite framebars, the arch-bar extended between and engaged at its ends with said frame-bars and curved upwardly from end t0 end, the continuous brace-bar overlying the arch-bar, made straight from end to end and rigid at its center with the arch-bar at the crown of the latter, means for securing the bracebar f set forth.

u CHARLES T. REDFIELD. Witnesses:

SoLoN C. KEMON, PERRY B. TURPIN.

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