US93138A - Improvement in gig sawing-machine - Google Patents

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ALEXANDER THOMPSON ANDv ZERAFWATERS, O

' ILLINOIs.

Letters Patat No. 93,138, daad .my 27, 1869. l

IMPROVEMEN'T IN GIG- SAWING-MACHINE.

*How- The Schedule referred to these Letters 'Patent and makingv part of the sama.

The objectof'our invention is to provide an iin-- proved portable foot and power gig-saw, ,for the use of carpenters and joiners, and for cutting out all kinds of scroll-work.

Figure 1 is a side elevation of our machine.

Figure 2 is a view of the gearing-apparatus.

vFigure 3 is a view of the sew and its attachments.

Figure 4 is a plan view ofthe arms.

Letter A represents the frame of our machine, which may be formed of any convenient size or shape.

Pivoted to the lower part of this frame, is the treadle B, which is connected to the crank-shaft, upon which the' balance-wheel C revolves, by `a s'hortarm.

-Cas't or secured to the side of this wheel, there is a 'driving-pulley, D, around which -the belt E passes, 4and then over the second pulley F, upon the shaft G. The pulley F slides loosely upon the shaft, and' has 'a slot cut in its sides, upon the top and bottom ofthe opeuingin its centre, so as to receive the two small projections upon the shaft.

To one side of the pulley, there is a-ange attached, in which there is a slot cut, so as to catch the end of the lever H, for the purpose of throwing the pulley in and out of gear.

Upon the outer end of'4 this shaft, there is a, small pulley, to which the motive-power can also be applied, while upon the other one there is a flat disk, I, which has a small eccentric-pin projecting from its side.

Attached to a hanging part of the flame, on its side, there is a slotted bar, K, which operates the saw.

This bar has three slots cut into it, two of which run perpendicularly, andA merely serve as guides, as it works up and down upon the box, fastened by bolts or screws, which hold it, while the third runs at right angles with the other two, and is the one in which the eccentric plays, so as to work the bar up and down. v

Secured to the top of the bar, is the saw-blade L,

which passes into aslot made for that purpose, and A then is held there bythe spring M, the lower end of which is secured to the bar K.

It has been customary, heretofore, t?) fasten the saw by means of bolts, or some such tro blesome device, which always requires time and patience to undo; but by thus securing it with a spring, it is held just as firmly, and is easily and readily removed and replaced. The upper end of this saw lis secured to the block N, which works in the head O.

Upon the top of this framev A, there are secured two long arms P, which branch out at their outerends, so as to allow the timber being sawed to pass through, while the other two ends approach close together, so as to serve as a support to the head O.

In order to give the saw more or less rake, this head can be moved either further forward or back, by moving the screw which passes through the two arms.

By forming the arms in this manner, we do away v`'with all the stationary rigging from the ceiling generally used for this purpose.

When it is desired to give the saweither a longer or shorter cut, the crankpin in the disk I can be moved nearer to or further from the centre of motion, there being holes made in the disk for that purpose.

Having thus described our invention,

What we claim, and desire to secure by Letters Patent is v 'he arrangement of the arms P, head O, block N, spring M, bar K, disk I, pulley F, and lever H, when all are cmbined ,in the manner and for the purpose specified.

In testimony that we claim the foregoing, we ,have hereunto Aset our hands, this 9th day ot' April, 1869.

ALEXANDER THOMPSON. ZERA WATERS. Witnesses:

R. L. DAVIS, A. O. SwEnTsER.

FI BLOOMuvGTON,A

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