US539637A - Half to joseph a - Google Patents

Description

(No Model.)

C. F. NYBERG SAW SHIFTER FOR GANG EDGBRS.

Patented May 21, 1895.

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FATENT CHARLES F. NYBERG, OF lYllNNEFOLIS, MINNESOTA, ASSIGNOR OF ONE- HALF TO JOSEPH A. GILLARD, OF SAME PLACE.

SAW-SHIFTER FORV GANG-EDG ERS.

SPECIFICATION forming part of Letters Patent No. 539,63*?, dated May 21, 1895.

Application filed January 15, 1895. Serial No. 535 ,021. (llo model.) l

ifo all whom it may concern,.-

Be it known that I, CHARLES F. NYBERG, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certainnew and useful Improvements in Saw- Shifters for Gang-Edgers, dac.; and I do hereby Vdeclare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to saw Shifters, for gang edgers and other machines, which have a series of saws adjustable on a common arbor; and has for its object to provide an improved device of this kind.

To this end the invention consists in the novel devices and combinations of devices, hereinafter fully described and defined in the claims.

The invention is illustrated in the accompanying drawings, wherein like letters refer to like parts.

Figure l is a plan view of a part of a gangedger or other machine having a 'series of saws on a common arbor with my improvements applied thereto. Fig. 2 is vertical longitudinal section through one of the saw-shifters when all the levers are in line with each other and in their normal position or plane of the saw. Fig. 3 is a sectional View of the sawshifter, similar to Fig..2, but on a larger scale, with some parts broken away vand the jaw-head or yoke of the saw-engaging lever turned into its uppermost position. Fig. 4t is a crosssection on the line XX of Fig. 1, looking from the right. Fig. 5 is a perspective view of the fulcrum-seat for one ofv the primary levers, and Fig. 6 is a similarview showing the pivot block or disk detached. Fig. 7

- is a plan View of a modified form of saw-shifter.

ce represents a saw-arbor, and a a series of saws, mounted on the said arbor and adj ustable lengthwiseof the same, for setting the saws to different spaces, in respect to each other. n

Considering first a single saw and a single shifter, b represents a cross-bar, extending parallel with the saw-arbor, and at some distance on one side of the same, and shown as in the horizontal plane.

pivotally connected to an arm or support b4, l

projecting inward from the cross-bar b. The lever b3 has its fulcrum or pivot b5 at its center. Ver b2 and. the lever b is formed bya vertical pintle h6 on the inner end of the lever b engaging with the socket 177, on the lever b2. The lever b3 is connected to the lever b2 and the rigid arm b4 by slot and pin connections asshown at bs. The pivotal center of the primary lever b is in the same plane as the particular saw controlled thereby, when the said saw is in what may be called its normal or position in which it is most run. The lever b2 is provided with a jaw-head or yoke b9, pivoted to the top of the socket body 67, and provided With a pair of jaws bw, adapted to embrace th'e saw and having fitted therein adjustable set-screws lg, for fixing the clearance for the saw, at any desired amount, and for taking the strain when adjusting the saw.

The levers b b2 b3, and the rigid arm b4 are so-constructed and related, that when the saw controlled by the particular shifter is in its above assumed normal position, the pivotal centers of all the said levers and the said ylevers themselves will all stand in the same plane as the saw, controlled thereby. The distance from the pivotal center of the primary lever b to the pivotal center of the saw engaging lever b2 is as shown equally divided by the three intervening pivotal points b5and bs; or otherwise stated, the two arms of the lever b3, the outer arm of the lever b2 and the length of therigid arm b4, inward of the pivotal point of the primary lever, are all shown equal. motion of the primary lever b', the saw engagin g lever b2 will not only be carried thereby, so as to adjust the saw, but will also be turned on its pivot, so as to maintain the parallelism The pivotal connection between the le- Hence, under the pivotal or angular of the same, with respect to its original or normal position and all other intermediate positions. For example, the relative positions of the parts of the saw-shifter, when in their above assumed normal position, with all the parts thereof in line with the saw, are illus-` above assumed normal position, in either direction, from the normal position, are illustrated by the front and rear members of the said saw Shifters. Shown in Figl. By inspec. tion of'this view, it will be seen, that the saw engaging lever b2 always remains in the same plane as the saw, no diderence what may be the position of the primary lever b'. There will, therefore, be no tendency to .buckle the saw on account of the angular motion of the primary lever b. The lever b3 and its connections, therefore constitute a parallel motion device or compensating device, for oifsettin g the angular motion which would'be otherwise produced onthe saw engaging lever b2, by the primary lever b', so as to maintain the parallelism of the said saw engaging lever in all possible positions.

Z912 is a guide-rail or rest, underlying the loaded or inner ends of the primary levers h', and serving to hold the saw shifters in their proper horizontal positions. Each of the primary levers has bolted thereto, a fulcrum disk U3, which is adapted to work in a corresponding seat b, formed in the cross-bar b, as best shown in Figs. 5 and 6. The lever with its fulcrnm is dropped into position from above and is held down by a cap-plate Z915, which, when in position, is bolted to the top of the cross-bar, as shown in Figs. l and 4. The said cam-plates 515 have tongue and notch engagement with each other, so that the said parts will interlock and be rmly held together. The bar b is cut away, as shown at Z216, in Fig. 5, so as to afford clearance for the angular movement of the lever b.

It is necessary to have an independent shifter for each of the several saws; and to afford the requisite power, the handle arms of the said levers must be of considerable length. Some provision must therefore be made to provide clearance for the levers to pass each other, under their angular adjustments. I accomplish this result by having the fulcrum seats for adjacentlevers in staggered relation, in respect to each other, in the vertical plane, as best shown in Fig. 4. of the drawings. For example, between any two ot the primary levers b', which have their fulcrum seats in the same level,two other levers will be located which have their seats in different levels, both in respect toeach other and to the pair of seats which occupy a common level. Under this arrangement, of the fullcrum seats, for the primary levers ZJ', any pair sedes? v of the said levers which lie in a common level, will be suiiciently far apart to permit the angular movements thereof, without interference with each other, and the said two levers will clear the intermediate levers, because moving in different planes.

Having regard to the modification shown in Fig. 7, the principle of the parallelogram is employed for maintaining the parallel motion of the saw engaging lever. To the cross-bar c, both the primary lever c and the lever c2 are pivoted. The saw engaging lever c is in the form of a link connecting the inner ends of the levers c and c2. The lever c2 is of the same length as the inner arm of the lever c" and is parallel therewith. Hence, under the angular movement of the primary lever o', the lever c2 will always move through the same angular distance and preserve its parallelism with the lever c; and the link-like lever c3 will always remainparallel with the saw arbor. The lever c3 is provided with jaws c4 which embrace the saw a and have setscrews c5 which operate in the same way as the corresponding parts of the lever b2. In both forms, the saw embracing jaws of the saw engaging lever should be of sufcient length to permit the in and out motion of the said lever, without disengagement of the saw. The form of saw-shifter, shown in Fig. 1, is preferable to the form shown in Fig. '7, because more compact, in respect to the lateral space required.

It will be observed that in both of the above illustrated forms, the device comprises, broadly considered, a saw-engaging lever for engagement with the saw, and a pair of controlling levers, connected to said saw-engaging lever at points offset from each other; the controlling lever being arranged to move the saw-engaging levers, and to hold the saine always parallel with the saw; and, further, that the above is accomplished solely by lever connections, without the use of guides for the saw-engaging lever.

Referring to the preferred form, the socket body 67 is provided with an oil duct Z117, leading to the socket and pintle bearing, and adapted to be closed by the jaw-head or yoke b9 when in its Working position.

It is obvious, that either of the two forms of saw-shifter herein di=closed, is of simple and cheap construction.

Modifications in the construction herein disclosed may be made without departing from the broad principle of my invention. For example, the saw engaging lever b2 and the rigid arm b4 have been shown in Fig. 1, as of equal length; and the two arms of the lever bhave also been shown of equal length. It will be understood, however, that the relative lengths of these various parts or arms are simply a matter of proportion. The dimensions of the several arms may be varied, relative to each other, provided the proper proportional lengths are provided for, with respect to the different piv- ICC IIS

otal points, so as to maintain the parallelism of the saw engaging lever under all the an gular movements of the primary lever b.

What I claim, and desire to secure by Letters Patent of the United States, is as follows:

1. A saw shifter, comprising a saw-engaging lever and a pair of controlling levers connected to said saw-engaginglever at points offset from each other, and arranged to move said saw-engaging lever and to hold the same always parallel with the saw, substantially as described.

2. A saw shifter, comprising a primary lever, a saw engaging lever pivoted on and carried bythe primary lever,and a compensating lever centrally pivoted to said primary lever and having one end pivotally connected to said saw engaging lever, and having the other end pivotally connected to a fixed arm or body, with the said xed arm, and the arm of the saw engaging lever connected thereto, all of the same length, substantially as and for the purposes set forth.

3. The combination with the cross-bar h, of the primary lever b', pivoted to said cross-bar, and provided with the pintle be, of the saw engaging lever b2 having the socket 57, engaging said pintle and provided with the pivoted jaw-head or yoke b9, the lever b3 pivoted tothe lever b and having one end connected by slot and pin to the lever b2, and its other end connected by slot and pin to the lixed arm b4, all constructed and operating substantially as and for the purpose set forth.

In testimony whereof I afx my signature in presence of two witnesses.

CHARLES F. NYBERG. Witnesses: v

JAS. F. WILLIAMSON, JOSEPH A. GILLARD.

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