US686399A - Saw. - Google Patents

Description

Patented Nov. l2, 190i. W. T. GEORGE.

(Application filed Ap (No Model.)

Inveniar:

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UNITED STATES PATENT OFF E.

' WILLIAM T. GEORGE, OF LIBERTY, MISSOURI.

SAW.

SPECIFICATION forming m of Letters Patent No. 686,399, dated November 12, 1901.

I Application filed April 9, 1901. Serial No. 55,055. (No model.) I

To all whom it may conce n.-

Be it known that 1, WILLIAM T. GEORGE,

, a citizen of the United States,residing at Lib- As well known, high tension on the blade of a saw-a butchers saw, for instance-if maintained constantly soon causes the frame to warp and takes the set out of the blade imperceptibly-so imperceptibly, in fact, that the blade is frequently refiled in a futile attempt to cure the trouble due entirely to the lack of set in the blade, the aggregate cost of refiling the blade unnecessarily usually.

amounting to considerable before its period of service is at an end, and when the seat of the trouble is located the blade must be reset, each resetting operation adding to the cost and shortening the period of service of the saw as a whole. The above mentioned defects are eliminated in the class of saws to.

which my invention belongs, my improvement consisting in the use of a lever pivoted on the inner arm of the saw-frame and operating at one side of the handle, being provided with a laterally projecting shoulder slotted to receive and pivoted to the inner end of the blade, said shoulder being pressedby the tension on the blade outwardly againstv the inner arm of the frame.

The novel features of the invention are pointed out in the appended claims, and in order that it may be fully understood reference is to be had to the accompanying drawings, in which- Figure 1; represents a side elevation of a portion of a saw embodying my invention. Fig. 2 is asection taken on line II II of Fig. 1. Fig. 3 is a view similar to Fig. 1 of the opposite side of the saw. Fig. 4 is a detail perspective view of the lever for efiecting the tensioning or relaxing of the saw-blade.

In the said drawings, 1 designates the handle of a meat-saw secured, as usual,to the metallic frame, said frame comprising the back 2 and depending arms, only the in'uerarm 3 being shown.

a designates the blade adapted to be pivotally connected in the usual manner'to the outer arm, so as to be capable of a slight movemennt in a plane parallel to that of the frame. I

5 designates a lever pivoted, as at 6, to the lower endof the inner arm 3 of the frame and adapted to operate against the left-hand side, preferably, of the saw-handle, said lever when occupying its operative position, as shown in full lines, extending nearly to the top of the handle in order to provide considerable leverage in its manipulation. At its lower end and inner edge it is provided with the laterallyprojecting shoulder 7, located in the plane of the frame, in order that it may bear squarely against the inner edge of arm 3 at times, and said shoulder is provided with the slot 8 in the plane of the side of said arm 3, opposite to the body of the lever, in order that the latter may play freely past the pivot 6. The blade projects into slot 8 and is se cured pivotally therein by the pin 9 bridging said slot. When the saw is not in use, the lever occupies the position shown in dotted lines, Fig. 1, and the blade consequently is not under tension and imposes no strain which would tend to warp the frame or take the set out of the blade, and owing to the fact that the pins uniting the blade with said lever and the outer arm of the frame are detachable it is obvious that the bladecan be easily and quickly removed for refiling purposes, the advantage of this arrangement being that the frame remains in possession of the owner and can be immediately equipped with a new or refiled blade.

To retention the blade for service, the lever is grasped and thrown in the direction indicated by the arrow, Fig. 1, to the position shown in full lines, said figure. In this operation the pivot-pin 9 swings from the position and firmly against the inner edge of the inner arm 3 of the frame, as shown clearly, in which position the tension of the blade and frame reliably maintains the lever. To relax the blade, it is only necessary to reverse the manipulation of the lever.

From the above description it will be apparent that I have produced exceedingly simple means whereby the advantages enumerated as desirable in the statement of invention are accomplished and that the attachment can be cheaply and easily applied upon saws of the old style at present in service as well as employed as a part of new ones.

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

1. In a saw, the combination of a lever pivoted to the inner arm of the frame, and provided with a laterally-projecting shoulder adjacent to its pivotal point, and with a slot in the lower end of said shoulder, at the side of the frame-arm opposite to the body of the lever, and a pin bridging said slot of the shoulder and pivotally securing in said slot the inner end of the blade, substantially as described.

2. In a saw, the combination of a lever pivoted to the inner arm of the frame, and provided with a laterally-projecting shoulder adjacent to its pivotal point, and with a slot in the lower end of said shoulder, at the side of the frame-arm opposite to the body of the lever, and a pin bridging the slot of said shoulder and pivotally securing in said slot the inner end of the blade, said lever being of such proportion and arrangement thatit shall work in a plane parallel to and at one side of the saw-handle, substantially as described.

In testimony whereof I affix my signature 40 in the presence of two witnesses.

WILLIAM T. GEORGE.

Witnesses:

WM. HALLISSY, G. Y. THORPE.

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