US101531A - Improvement in saw-mills - Google Patents

Description

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y HENRY F. SNYDER AND GEORGE S. SNYDER, OF WILLIAMSPORT. PENN- SYLVANA.

Letters Patent 1Y0. 101,531, dated April 5, 187' IMPROVEMENT IN SAW-MILLS.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom yit may concern Be it known that we, HENRY F. Ssvnnn and GEORGE S. SNYDER, of Williamsport-, in the county I of Lycoming and State of Pennsylvania, have invented certain new and usetul Improvements in Muley-Saw Hangings; and we do hereby declare that the tollowing is a t'nll and exact description thereof.

That is known as a muley-saw is mounted indepcndentlyof any gate or stretching-flame. It sup? ports itselfl by its own stiiness. 1t is capable of rnnning much quicker than the pondcrous gate-saws. Its lower end is connected toa pitman, which is operated b'ya crank below. Both ends are carried in slides,

which are nearly vertical.

Onr invention provides very eiiicient means for swiveling the saw around, or turning it on a vertical axis with great delicacy within narrow limits. It aids very greatly in causing the sa-w to run true. Any slight inequality in the tiling on opposite sides of the saw, or Yeven a dulling of one side more than another by Contact with grit, metal, or even a very hard knot, may give a saw which has been previously well adjusted a tendency to run to one side or the other. In such case we swivel the saw around sulciently tobalance such tendency.

The accompanying drawings form a part ot this specification.

Figure 1 is a front view of theI saw and the 'cnnn'ected mechanism.

Figure 2 is a plan view ot the entire apparatus.

Figure 3 is a vertical section on the line s sin lig. 1.

The carriage for moving the logl and the means for operating it are omitted as non-essential. They may be of any approved construction.

The additional gnres represent the stirrup and s'wiveling connection at the 'base of th(l saw on a larger scale.

Figure 4 is aside view, halfin sect-ion.

Figure 5 is an edge view, halt` in section.

Figure 6 is a View from above.

Figure 7 is a horizontal section.

Similar letters of reference indicate like parts in all the figures. i

The drawings represent the novel parts with so much of the other parts as is necessary to indicate their connection thereto. All the parts not here represented may be of-the ordinary approved construe? tion.

A is a stout frame-work of wood. B is a rapidly-revolving shaft, driven by a steamengine or other suitable power. a b is a crank-pin, fixed in the slot in a face-plate, b, whichis carried on the shaft B.

C is a-connecting-rod, which communicates a recip-.

rocating motion to the saw from the rotation of the crank-pin b'.

The saw is represented by D, and may bc of any approved breadth, thickness, style of teeth, dto. Its lower end is held in a stirrnp, E, and its upper end between guide-blocks, as represented by G, which, together serve as a cross-head.

Directing our attention tirst to t-hc lower end of the saw, we provide means for swiveling the saw D and the connecting stirru p E around on a lower cross-head, and for adjusting it very tirmly at varius angles. The construction at this point is shown very clearly in iigs. 4 and 7 rlhe lower end of the stirrnp E is' formed wit-l1 a strap, E2, operated by a gib and key, EZ E, and einbraces a brass box, formed in two parts, I Ii, which, iu turn, embrace the pin J, which extends through suitable bearings in the upper end of the pitman C, and is guided by blocks, which run in very firmly fixed vertical guides A1. These guides A' may be formed ofcast-iron, and bolted immovably upon the'iraming A.

The pin'J. and the entire cross-head of` which this pin forms a prominent part, is guided by the slots A1,

Vand cannot swivel, butis compelled to simplymove up and down by the rotation of the crank-pin b'.

The upper and lower faces ot' the boxes II I2 are spherical. The adjacent surfaces of the stirrup E are correspondingly hollowcd. By loosening the key E, the force with which the ,boxes ll I2 are held within the stirrup is reduced. I n this condition the stirrnp may be taken hold ot' bya screw-wrench or other suitable device, and turned a little to the right or the left; in other words, the stirrup may be swivele-d around to a slight degree, turning on the boxes Il 1*. When it has been turned just to a sufficient extent, the key E3 is again tightened, and this compels the stirrup to again take hohl veryiirmly and rigidly ou the boxes I I2, but in the new position.

It will be observed that the boxes 1 12 are so constructed that there is libert-y to turn to a small extent within the strap El, as shown in iig. 7 that is to say, the flanges on the boxes are not matched tightly-on this strap, but each made to iit a little loose.

Furthermore, it will be seen, by observing atten-l tively the form of the boxes, that they till the strap El only along the middle line of said strap; in other words, there is a slight bevel on the faces ot' the boxes presented to the interior of the strap at the front and rear. It follows that the boxes are held very etlicientl y against forward or backward motion within the strap by a direct contact therewith along theY middle line, but there is libert-y to` swivel around withinl the strap to as great an extent as is ever required in practice.

We. employ entirely dilferent means for swiveling around the upper. end of the saw. Here weleave the saw immovably connected to the guide-blocks, and

shift the movable guides, in which the latter runs. lc-

hand-wheel or-ot-her suitable means, so that the hous-v ing M may bc raised or lowered bodily at will within.

wide limits. Y Y

The housingl M carries two slides, m. andmf. The rear slide m is fixed in the housing, but the front slide m is adjustable laterally by screws Ol O2 O. Both the slides m and m' with the screws and the other attachments are raised and lowered together with the housing. The importance ot' providing a movable housing, which can be raised and lowered, is so well-understoodby sawyers as to require no explanation. We

. employ all the ordinary provisions for sustaining and guiding the saw by means of this housing, and for guiding the saw at the extreme lower edge of the housing, by blocks of hard and well-oiled wood, as indicated by Ml M2, as will be readily understood.

Now to swivel around the upper end of the saw,we slacken the screws O and tighten the screws O2 or the reverse. The effect is to move the slidejm' to one side or the other. We -provide jam-nuts on all the screws, to insure their remaining very tirml)Y in position.

The front screws O3 perform the same function to drive back the slide m'fsulc'iently to compensate for the wear of the slide and guide-blocks.

Though we have spoken of the slides'as vertical, it will be obvious that they can work with some success in various degrees of inclinations, and in such case the swiveling ot' the saw would not be around a strictly vertical axis.

Vhen the saw is tobo used fora considerable period onsmall lumber, we lower the entire housing M by turning a wheel, N, and when it is to Vbe used on large lnmber,'it'will be necessary to correspondingly raise the housing and its attachments. The point desired is to keep the side bearing blocks, which guide the saw laterally, as near the ueper surface of the lum le change theV ber to be treated as practicable. stroke of the. saw at will by shifting the crank-pin b' in a slot in which itis fixed.

Vie do notv confine ourselves to the use of all the ydetails of the mechanism in the precise form and proportion here shown; but Y v 1. In combination with the saw D and cross-head J, as specified, the swiveling boxes Il I2, itting in correspondingr bearings in the griping parts E El, and provided with the key E, or equivalent meansl for tightening and liberating their hold, in the manner and for .the purposes herein set forth.

2. In combination, the within described adjustable swivelng connection between the boites Il I2 and the griping parts E El at the lower end, and the movable slides, 'which 'allowof correspondingly swiveling the saw at the upper end, when arranged for joint operation, snbstantially'as and for the purposes herein set forth. i

1n testimony whereof we have hereunto set our names in presence ot' two subscribing witnesses.

H. F. SNYDER. G. SNYDER.

Witnesses J. D. SNYDER, JN0. G. Helsen.

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