US82585A - Improvement in soeoll-saws - Google Patents

Description

i @einen grains datent @fre- C. M. BAXTER, OF LEBANON, NEW HAMPSHIRE Letters Patent No. 82,585, datedSeptember 29, 1868; antedated September 17, 1868-- IMPROVEMNT IN SCROLL-SAWS.

TO WHOM IT MAY GONCERN:

Be it known that I, G. M. BAXTER, of LebanonQGrafton county, and State of New Hampshire, have made new and useful Improvements in Gig-Saws; and I hereby declare the following to be a full and exact description of the same., reference being had 'to tlie drawings that accompany and form a part of these specifications.

The object of my device is to provide for sawing scroll and other ornamental and fine work with more facility, producing less vibrating motion to the door `than in saws as heretofore arranged? Figure 1 is a front view.

Figure 2, a. vertical section on line a b.

Figure 3, view of rolling pivots in end of beam.

Letter A, platform or table.

B, frame, with one standard, B', extending abov'e the platform. p

C C. arms, extendingfrom the standard B over the platform', to sustain the upper end of the siiw.

D D, working-beams, hung in the centre on journal e e.

short arms, attached Ato the standard B"by a-hinge'above the arm C. On this the upper beam rests.

F, a movable standard or support for the short arm E. Y

G, a grooved piece of metal, attached atene end to the arm'C, in which the lower end of the standard F is moved back and forth for the pnrposeoi' throwing the strain oli` or on the saw.

AH, screw, with crank-wheel attached, made fast to the arm C, directly under the grooved piece G, for the purpose of raising or lowering the outer end thereof, which is calculated to be elevated in front, forming an inclined plane, as shown in iig. 2.

I, pulleywi th crank-wheel n the outer end. K, pitman, connecting the crank-wheel of the pulley with the end of the lower beam.- The lower end of the pitman is connected with the beam by a ball-joint, which provides for the movement of the crank and sweep 'of the beam.

jj, rods, connecting the slides z' z' with the ends of the beams D. These slides z' z', or parts of' the rodsj that come within the bearings above and below the saw, are made larger than the rods. hollow tube may be used for this purpose, the 'rodsj and the hook for holding the saw screwed Ainto the'cnd thereof.

The rod k, connecting the. outer ends of the beams D, is constructed in the same manner, and is supported and steadied by the arms or brackets m m, as seen in iig. 1.

I have double bearings, n n, above and below the saw, in which the slides iz'operate, and Which-serve to guide the saw more steadily and accurately than those in common use. y i

In the ends of the rocking-beams are turning pivots S, into which the ends of the rods lc andj are screwed, iig. 3 being an enlarged view of the same. These pivots provide for the sweep or circle of the beams when in motion, and by the screws on the end ofthe rod c'tho distance between the ends of the beams is adjusted.

, .To provide for longer or shorter saws, I make several holes in the upper part of the rod j where-it connects with the beam, passing a pin through the beam and rod. l By this means it is very readily adjusted to saws of different lengths. l y

In sawing scroll and ornamental work, the saw has to be frequently unshipped at one end and put through a hole in the work.' It is, therefore, important to have it done quickly. This I have provided forby the movable-'standards F working in Vthe inclined groove G. 'I adjust the saw by the means heretofore described, and bring it to the pr'oper degree of tension by the screw H, the standard F being kept in a vertical position. In order to relieve the saw of the strain, I have only to move the lower end of the standard F back in the groove G, and when ready for operating again, pull the standard back to its original position, and I have exactly the same degree of tension as before,`always sure and expeditious. I*

The advantage'I claim for the beams D D is, that there being a certain amount'of weight going up at one end, the same amountA is going down at the other, thus balancing, and preventing that vibrating motion generally given to theloor by quick-motioned saws.

Having only one standard, the platform or table A is left clear for turning the material to be sawed in any direction desired. y

By this arrangement of mine, it will :be seen that the power is applied by the pitman to the opposite end of the beam from the saw. rlhis gives a. steedier motion than ifv applied directly to the saw.

vWhat I claim, and desire to secure by Letters` Patent, is I The combination of the short arms E, the movable standard F, and inclined groove Gr, with the screw and crenlI-nlieei H, being so arrangedrthat the strain may he thrown off or on :the saw by a. single motion, substantially as set forth.

In testimony whereof, I have signed my nameto this specification in the presence of two subscribing witnesses.

' C. M. BAXTER.

Witnesses E. J. DURANT, J. M. PERKNS.

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