US23004A - Method oe operating recipbocatisfg saws - Google Patents

Description

T. J. ALEXANDER. METHOD 01E OPERATING REGIPBOGATING SAWS; No. 23,004. Patented-Feb. 22, 18591 M z/ ww ans a THOMAS J. ALEXANDER, OF \VEST'ERVILLE, OHIO.

METHOD OF OPERATING RECIPROCATLNG SAWS.

To all whom (it may concern:

Be it known that I, THOMAS J. i ,EXANDER, of \Vesterville, in the county of Franklin and State of Ohio, have invented a certain new and useful Improvement in Handsawing Arrangements, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing, which forms part of this specification, and in which-- Figure 1 represents a view in perspective of a hand sawing apparatus constructed according to my improvement; and Fig. 2 atop view or plan of a portion of the rear end of the apparatus and showing the operating levers in intermediate position of their full stroke; and Fig, 3 a diagram, in further illustration, as hereinafter specified.

My improvement has reference to that description of hand-sawing arrangements in which the saw has its reciprocating motion given it by or through the intervention of levers operated by hand. Some of these arrangements have had but a single lever pivoted at or about its center and so shaped as to form an upper horizontal and lower vertical arm, the latter driving the saw by means of a connecting bar, and the upper arm serving for the hand of the operator to vibrate the lever to work the saw. Others,

of these arrangements, have employed a horizontal rocking beam to be worked by the hands, at either end, by the operator standing on a rocking platform for the purpose, to give motion to the saw by a branch from the beam jointed to a rod that establishes the connection with the saw. Others, again, have used a rotary motion, and others a side action or swing, to produce the requisite movement of the saw; and some of the before mentioned arrangements have employed a pole for carrying the driving devices, pivoted to a standard in the rear and arranged to extend in front to be spiked on to and hold the stuff being sawed.

I am thus particular in referring to certain previous hand sawing arrangements as, in the following description of working parts and other portions here shown connected with my improvement, I wish it to be distinctly understood that I am not claiming as my invention parts and principles or actions which are old or common.

The previous arrangements, I have referred to, are objectionable not only (as regards many of them) on account of their complexity, but as involving an injurious stooping or unnatural position and awkward working of the body, or as presenting but poor facility for working in an effective manner with both hands or for fully exerting muscular force without great fatigue; and it is to obviate some or all of these defects that is the object of my present improvement.

Description. (See Figs. 1 and 2.)In the accompanying drawing, the saw A, which is shown arranged to cut vertically and which if preferred may be sharpened to cut during both of its strokes, is fastened in the rear to a connecting bar that is jointed at its back end to the lower portion of a vertical beam or lever (O). This beam (C) is hung to vibrate freely on an intermediate horizontal fulcrum or shaft (a) that crosses the hinder portion of a pole (D) jointed or otherwise suitably fastened to a back standard (E) and extended in front to clamp the log or stuff being sawed by (say) driving a spike (5) through the front end ofthe pole into the log. The rocking beam (C), which is shown arranged on the one side of the pole (D), has its upper arm provided with a handle On the other side of the pole (D), or at a suitable side distance from the rocking beam (C), is a single upper vertical arm or rocking lever (F), also provided with a handle (0), and which lever may have its fulcrum or hearing on the cross shaft (64) of the pole, but, whether the rocking beam C) and lever (F) thus work on one shaft, or have separate shafts, it is necessary that the hand folding portions of both levers be made to vibrate in reverse directions to each other. Said levers may have their motions back and forth restricted by any suitable stops (w, The height of the hand holding portions of the two levers should be such as to make said levers easy of operation back and forth by a person when standing erect. The beam (O) and lever (F), though independent of each other, I couple together by any suitable gear or device that, in the action of the one vertical or upper arm of the lever or beam forward, shall cause the pther upper arm or lever to work backward, and vice versa; either one lever serving to operate the other lever in a reverse direction to it. Thus, the beam (C) and lever (F) may be provided with curved racks or bevel gears (d, (Z) arranged to mesh on opposite sides into a horizontal pinion (e) havii'ig its spindle on or in the pole (D). The diagram (Fig. 3) shows substantially the same arrangement, but here the intermediate pinion is dispensed with by arranging the cross shafts (a, a) of the levers (C, F) one in advance of the other and causing the curved racks or toothed segments of said levers to mesh with each other direct, to produce the same character of reverse action. Other equivalents for the same purpose might be mentioned, but to do so is unnecessary here.

0pemti0n.-Supposing the operator to stand in the rear, he clutchesthe one with his right hand and the other with his left the upper arms or levers, or handles (0, 0) thereof, and urging the one lever forward simultaneously draws the other lever back, first striking out with his one hand or arm and then with the other alternately, to give a repetition of forward and back strokes to the levers. By this movement, the operator reciprocates the saw backward and forward to effect the cut, the connection of the saw with the one lever or beam, and the gear of the levers together to operate in reverse directions, making both independent or separately hung levers the drivers of the saw. By this action of the two parallel or side levers (C, F), each back pull of either of the operators arms exerts a driving force to the saw corresponding in effect, or thereabout, to the driving forward stroke or thrust simultaneously exerted by his other hand or arm, which makes the constant and gross effect, of course, equal to the power exerted by both arms, and as either arm.

alternately pulls while the other pushes, in directions approximately a horizontal motion, an equality of force may if necessary be easily preserved. Such arrangement or action of the rocking and driving levers admits of a good, if not the best, application of the muscular force of the arms, without racking the body of the operator and within convenient stretch or action of his arms; and, in thus workingthe saw, all injurious stooping or swaying of the body may be avoided, the chest is expanded in a healthy manner, and the operator allowed to stand erect as designed by the God who made him. In case of the weight of the saw and its connecting rod not being suflicient to secure a proper cut or action, any superincumbent weight or pressure may be added, or a counterbalance may be applied to diminish weight or pressure of the saw in cutting. In some cases, the saw may be arranged to operate above and the driving levers be operated from below, after the manner before described, by the operator standing in a pit or on a lower level for the purpose.

For cutting up a felled tree into saw logs, and for various other sawing purposes, this iy improvement will be found very advantageous, and by it more force can be applied to the saw, and with greater ease, than by the ordinary method of hand sawing; while the simplicity and portability of the contrivance forms a consideration of no little value to farmers and others.

What is here claimed, as new and useful, is:

Reciprocating the saw by means of right and left hand rocking levers or drivers jointed to or otherwise connected with the saw; when said levers are separately hung or pivoted and geared together for reverse action, and so arranged as to admit of being worked by the hands of the operator substantially in the manner specified.

In testimony whereof, I have hereunto subscribed my name.

THOS. J. ALEXANDER.

lVitnesses R. R. ARNOLD, I. G. ARNOLD.

Images