US8954A - Stkainiitci-saws ikt sawmills - Google Patents

Description

i u l TEDsTATEs PATENT oEErcE.

EDMUND BOOTH, 0E PHILADELPHIA, PENNSYLVANIA.

sTEAiNINe saws 1N sAwMILLs. y

` Specification of Letters Patent No. 8,954, datedMay 18, 14852.

. To all whom it may concern:

Be it known that I, EDMUNnBooTH, of the city and county of Philadelphia and State of` Pennsylvania, have invented certain new and useful Improvements in the Mode of Hanging Reciprocating Saws; and I `do hereby declare that the following is a full, clear, and exact description of the same, reference being had tothe accompanying drawings, forming part of this specification, in which- Figure l, is a front elevation of a saw mill having my improvement attached. Fig. 2, is a vertical longitudinal section showing the manner in which the lever is connected to the spring, and the guide rod. Fig. 3, is a detached and broken view, showing the frame in sect-ion and the working parts in elevation.

\ Similar letters of reference indicate corresponding parts in each of the several figures.

'Ihe nature of my invention consists in the `employment of a lever, passing through and working freely in, and up and down, an oblong slot cut in a vertical post secured to the top and nearly in the, center of the saw mill. This lever is attached atone end near its fulcrum, to a rod or link which connects it to a spring secured to the top of the saw mill, and the other endis inserted into the upper guide rod of the saw and works in a slot in the same. The object effected by this lever is of great importance, viz:` that of equalizing the strain or tension on the saw when it is at highest or lowest point and thereby preventing the saw from kinking or bending as it is ascending, as is common for it to do, when the spring is attached directly to the guide rod of the saw,for when the saw is attached directly to the spring, the strain on it is greatest when it is at its lowest point, and therefore it will be seen,

that when the saw is drawn upward it is liable to kink or buckle, and thereby cause considerable loss of time and labor in reset ting it, whereas by hanging or connecting the saw to the lever and spring in the man ner hereinafter described this diiculty is avoided, as the strain on the saw is always equal no matter whether it be at its highest or lowest pointor up or down.

To enable others skilledvin the art to make and use my invention I will proceed to describe more fully its construction and operation.

A, A, represents theiframe of a saw mill and B, B, are the posts or columns supporting the same.

C, C, indicate' two posts, that lettered C, being securedto the top and nearly in the center of the `frame A, and the other lettered C', being secured in a line with the one .lettered C, to the bottom of the said frame.

Between these posts there is a space left which is occupied by the saw. To the upper post C, boxes D, for the upper guide rods E, of the saw, to move up and down in, are secured. There are also similar boxes D', secured to the lower post C, for the lower guide rod E', to move in. i

In the upper plate F, attached to the upper guides and throughthe upper post C,

a vertical oblong mortise Gr, is cut. Through this mortise or slot, alever I-I, passes (as represented in Figs. 2 and 3 of the draw ings), and is secured at Ione end by means of a fulcrum pin a, to a small standard I, attached to the post C. The other end of this lever is inserted in the upperrguide rod E, of the saw J, in the manner represented. The lever II, works up and down the slot G, and turns freely on its fulcrum a, and also works in the slot s, in the guide rod E.

L, represents a connecting link or rod, which moves and works in a slot cut in a brace ofthe frame and which connects the lever to the spring M,;sccured to the top of the frame'in the manner shown in Fig. 2 of the drawing or in any other suitable way. This link it will be seen by referring to the drawing is connected to the lever or that part of the same, lettered b, near its fulcrum a. By thus connecting the link of the spring near the fulcrum a, of the lever II, it will be seen that the lever II, (when the saw is in motion,) has, near its fulcrum, an oscillating motion and also that when the saw is drawn downward, the part lettered b, to which the link L, connecting the lever to the spring is attached, is thrown nearer to the fulcrum a, and farther from the weight and consequently more leverage is obtained to pull the spring downward, and when the saw is ascending the part of the lever lettered b, is thrown farther from the center or fulcrum a, and the end l, of the lever H, works freely in the slot s, as will be seen in Fig. 3, thus causing the strain or tension on the saw either when up or down to be equal, or rather as the saw reaches its highest point the part of the lever lettered Z,

cause the rod to rise and hold the saw` always tight, and when the saw is at its lowest point the great strain` of the spring is taken away partially and an equal or the same amount of tension given to the saw at that point as when at its highest point.

The saw is connected at one end' to the upper guide rod D, which is connected to the lever H, and the other end passes through the slot e, through the top of the table N, and is also vconnected to the lower guide rod D, secured to the post C, which is secured to the connecting rod O, of the crank 1P, which gives motion to the saw, through the iiy wheel Q, and pulleys R, R, which are oper-- ated upon by any suitable power.

Operation of the Zeven-When 'the saw' has made a half stroke downward the end Z, of the lever H, will move farther from the fulcrum a and occupy the position indicated by a dotted line and star, inthe slot s, and; when it has made its full stroke down the lever will assume the position shown in full force -or .thrust of which on the lever Causes the end Z, of the lever to force the guide rod E, upward; and thereby keep the saw tight and also prevent i-t from kinking or :bending when it commences `to rise :or fall.

The dotted arc of a circle, shown in red lines in Figs. 2 and 3, indicates the direction in which the part lettered Z2., moves.

I intend applying this improvement to every kind of saw to which it may be ap` plicable, and therefore I do not intend to around, and allowing of logs being cross cut as well as slit, and another advantage is also gained, as the sweep or stroke of the saw may be of any desired length, without any liability of its kinking or bending, this difficulty being prevented by the equal distribution of strain on the saw both at the commencement of its rising and falling.

Having thus fully described lthe natu-re and operation of my invention I will now state what I claim as new and 4desire to secure by Letters Patent.

' I claim- The employment of the lever H b Z, yor its equivalent, the Vspring M, connectedl to the lever H, by a rod or link L, which is secured or attached to the lever near its fulc-rum a; both operating together and in combination with a reciprocating saw, connected to the -lever H, and the whole being constructed and arranged and operating substantially as herein described.

E. BOOTH.

Witnesses GEO. S. WiLLrrs,

JAS, S'roK-Es.

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