US1159153A - Sawing-machine. - Google Patents

Description

A, APPELGATE.

SAWINYG MACHINE. APPLICATION FILED MAR. 20. i915.

Patented Nov. 2, 1915.

I ran S A E PATENT WE E AILVA APPELGATE, or TOLEDO, IowA.

. sAwInG-MAoHiNn.

To all whom it may concern." I

Be it known that I, ALVA APPELGATE, a citizen of the United States,-residing at T0- ledo, in the county of Tama and btate of Iowa, have invented certain new and useful Improvements in Sawing-Machines, of which the following is a specification, reference being hadto the accompanying drawings. I

This invention relates to sawing machinery, and particularly to a sawing machine adapted for sawing standing timber,

stumps, etc., and one of the-objects of my invention is to provide a verysimple, cheaply constructed, readily portable and readily operable sawing machine adapted to be operated by any suitable motor. I

A. further object of my invention is to provide means whereby the sawand saw bar may be so supported thatthe saw bar and the saw may be pivotally moved inna horip1ane A further object of my invention is to-provide means whereby thesaw maybe held, to its work, said means being under the .control of the operator r Still another object of my invention is to provide very simple means for connecting the saw to the pitnian of the engine so thatthe saw-bar and connecting rod or pitman shallbe flexible'in two directions.

. Other objects will appear in thecourse of the following description. My invention is illustrated in theaccorhpanying drawings, wherein: V i

Figure 1 is a plan view of the sawingmachineconstructed in accordance with my invention; Fig. 2 is a longitudinal sectional view of the sawing machine; Fig. 3 is a perspective view of the crankshaft bearing;

Fig. 4 is a perspective View of aportion of the base with the saw bar guide; Fig. 5 is a perspective view of the bar 29; Fig. 6 is a perspective view of the cross head 27.

Referring to these drawings, 2 designates a base, which, as illustrated, is in the'form of a relatively long plank, the plank in the practical use of my invention being about twelve feet long and aboutonefoot-wide. This plank or base, at least'at' one end, is intended to be mounted upon a smallwheeled truck, designated 3, so that the device may be readily portable.

I Specification of Letters Patent. I I Patented NQV, 2 1915, Application filed March 20, 1915. Serial in. 15,874.; I

Mounted upon the base are the'oppo sitely disposed bearing brackets 4:, which,

means ofbolts 5. These brackets supportboXes within which is *rotatably mounted thecrank shaft 6, this crank shaft carrying the belt 'wheel 7 whereby power is transmitted to the crank shaft. I

Preferably mounted upon the base 2,

though not necessarilyso, .is a motor desig-" nated 8, having any suitable connection to the shaft 6.

Slidingly supported upon the base 2 for longitudinal movement is the saw-bar 9.

This saw-bar is longitudinally slotted, as at 10, and mounted" upon this bar is the saw 11, the particular form of -mounting being hereinafter stated. The saw-bar is guided upon the base by means of a block 12 which is preferably rectangular and which is held in place upon the base by means of a bolt 13, the block being freely rotatable upon the bolt,'o-r in other words,pivoted thereon.

The saw-bar is connected tothe crank shaft by means of a pitman or 'connecting'rod 14-. This pitman rod at "its end adjacent the crank shaft is provided with the oppositely disposed longitudinally extending irons or strips 15 which are bolted to the connecting rod by means of bolts 16. Attached to the pitm'an'or connecting rod l'by means of theseirons 15'is the sectional wooden'boxing 17 ,the irons being clamped upon the boxing 17 by means of a single pivot bolt 18 at the ends of the 'irons. At the opposite endthe pitman or connecting rod is provided with the. oppositely disposed-upper and lower longitudinally extending irons or strips 19,

held to'th'e rod by means of a pair of bolts 20. It will be noted that the sections of the boxing 17 cannot'swing to one side because a when they areparallel to'the straps 15 they cannotfopen, and when the pitman: does' swing to one side'itneverentirely uncovers these blocks so that-they still will be closed.

A connecting means is preferably used between these blocks, -h0wever, so as to prevent any tendency of'the blocks to open up. It is to be noted that the pivotal connection between the straps 15 andt-hesections of the boxing is loose enough to permit the-free rotation of the straps with relation to the sections without placing'a'ny strain upon the sections as will cause them to bind upon the x crank shaft and tend to open. Pivoted to the other ends of the irons is an arm 22 which extends into a recess 23 formed in the nection between the pitman or connecting rod 14 and the saw bar is a flexible one which will permit the saw bar to oscillate in a horizontal plane and Within a certain angular range.

The base 2 is formed with the transversely extending groove 26 within which is mounted a transversely extending guide 27. This guide is longitudinally slotted, as at 28, the upper face of the lower wall of the slot being flush with the upper face of the base 2. The slot is sufiiciently long to permit the lateral oscillation of the saw bar. Pivotally mounted upon the upper face of the base 2 and extending through the slot of the guide 27 is a bar 29 which is pivoted at 30, and which, at its free end, is formed with the resilient member 31 which bears yieldingly against the rear edge of the saw bar 9. The free end of the pivoted member 29 is yieldingly urged against the back of the saw bar by means of a coiled spring 32, which spring is connected at its other end to a cable 38 which passes around pulleys 34 and from thence extends, as at 35, to any position convenient to operate. The operator, by pulling upon the cable, increases the tension on the spring and thus yieldingly urges the cutting edge of the saw intoengagement with the work.

The saw blade 11 is mounted in the saw bar by insertion within a slot 36 formed-in the saw bar and is held in place therein by the bolts 37. v

The operation of my invention will be obvious from what has gone before The crank shaft is rotated by means of the motor,

and this,through the pitman or connecting rod, causes a reciprocation of the saw bar 9 and consequent reciprocation of the saw. The saw is held to its work by means of the spring 82 and tensioning cord 38. The pressure with which the saw engages the work may thus be readily controlled from the engine.

Inasmuch as the saw is mounted for, pivotal movement in a horizontal plane, it is obvious that it may be readily applied to trees or stumps of any diameter. Inasmuch as the saw bar and the allied parts are all mounted upon a single base, the device may be readily transported from place to place. It is pointed out that the angle between the middle position of the saw bar and either one of its extreme positions is only about eleven degrees. This angle is so slight that only a slight resistance will be necessary in order to counteract any thrust upon the saw bar and cause the power of the pitman to be so transmitted to the saw bar as to cause a reciprocation of it. This slight lateral thrust which might tend to oscillate the saw bar instead of reciprocate it, when the saw is beginning Work, is counteracted by the pressure of the feed controlling member 29 and by the spring 82 and the force applied to the'cord 35. Such force is applied to the cord 35 as will cause the member 29 to act as a guide preventing any movement of the saw bar except in one direction, that-is, toward the work to be cut. N ow when the saw has passed its middle position and is moving over to the right hand edge of the platform (see Fig. 1) this movement of the saw bar upon its pivot 13 is resisted by the work itself. Furthermore, it is pointed out that when the connecting rod22 strikes one side or the other of the recess 23 there will be no pivotal movement of the saw. bar and this is the position that is taken at the time the; saw bar starts its operation and whenit finishes.

One particular advantage achieved by my invention is that the saw is disposed so low down that it will cut the stumps or standing timber on a level with the surface of the ground, which is-notthe case with other portable drag saws of this character known by me;v

While I have illustrated the invention as being mounted upon the base, Ido not wish to be limited to this as the engine might be mounted upon a separate truck and operatively connected to the saw through the belt pulley 7.

It will be noted that inasmuch as the pit man let is pivotally connected to the boxing 17 by means of a pivot. bolt 18, the pitman may move in aplane at right angles to the plane of. rotation of the crank shaft. It will thus permit the saw bar to be rotated upon its pivot bolt in a manner described.

While I have illustrated what I believe to be a very practical form of my invention. I do not wish to be limited to this as it is ob vious that many changes may be made without departing from the spirit of the invention.

Having thus described my invention, what I claim is:

1. In a sawing machine, a base, a longitudinallyslotted saw bar mounted upon said base for sliding movement, a single guiding member projecting upward from the base and into the slot of the saw bar whereby the saw may have longitudinal reciprocation and simultaneous lateral oscillation upon the guiding member, means for reciprocatmg the saw bar, said means permitting the lateral oscillation of the bar, a saw mounted upon the saw bar, a'member bearing against the back of the saw bar, a tension spring engaging said member, and a tension adjusting connection leading from the tension spring.

2. A sawing machine including a base, a longitudinally'slotted saw bar, a saw connected thereto, a guiding member extending upward from the base and through said slot and with which the saw bar has pivotal sliding engagement, a head mounted upon the rear end of the saw bar and having a recess in its rear end formed with divergent side walls, means for transmitting reciprocatory motion to the saw bar including a pitman rod and means for connecting the pitman rodto the head comprising a pair of irons embracing the pitman rod, an arm pivoted to the extremities of the irons, said arm being inserted in said recess, and means for pivotally'connecting the extremities of the arm to the head.

3. In a sawing machine, a saw bar reciprocatively mounted for oscillation in a hornzontal plane, a saw carried thereby, a crank shaft rotatable in a vertical plane, a pitman operatively connected to the saw bar for pivotal movement with relation thereto, a boxing through which the crank shaft passes, a pivotal connection between said boxing and the pitman comprising oppositely disposed irons attached to the pitman Copies of this patent may be obtained for the crank shaft whereby the pitman may have pivotal movement in a plane at right angles to the plane of rotation of the crank shaft.

4. In 'a sawing machine, a fiat horizontally disposed base, a saw bar slidingly mounted on said base for reciprocation and simultaneous oscillation, a saw mounted upon the saw bar and projecting beyond the base, a driving crank shaft mounted. upon the base rearward of the rear end of'the saw bar,

said shaft rotating in a vertical plane, a pitman connected at one end to the crank, shaft for oscillation in a plane at right angles to the crank shaft, and a flexible joint connection between the pitman and the saw bar permitting the movement of thepitman in a vertical plane relative to the saw barand permitting the pitman and saw 7 bar to take angular positions with relation to each other, and means yieldingly engaging the saw bar and urging the sawtoward the work.

In testimony whereof I hereunto afiix my signature in the presence of two witnesses. ALVA APPELGATE. Witnesses:

H. bPUGER,

CHAs. BENESH.

Washington, D. 0.

five cents each, by addressing the Commissioner ofzPatents,

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