US1766650A - Woodworking machine - Google Patents

Description

J1me 0- F. .J. KISTNER Er L WOODWORKING MACHINE Filed April 9, 1929 '4 Sheets-Sheet 3P8. mmm n N+ .m v M WE m m mf M u K i .m

June 24, 1930. F. J. KISTNER ET AL WOODWORKING MACHINE Filed April 9, 1929 4 Sheets-Sheet 2 June 24, 1930. KlsTNER ET AL WOODWORKING MACHINE 4 Sheets-Shet Filed April 9, 1929 INVETORS. 'IITIQY' Frederick J. Kis

Wi am 3. Willia By W ATTIORNEY.

4 Sheets-Sheet F. J. KISTNER El AL WOODWORKING MACHINE Filed April 9, 1929 June 24, 1930.

Patented June 24', 1930 DFFIQE FREDERICK J. 'KISTNER AND WILLIAM S. WILLIAMS, OF CINCINNATI, OHIO, ASSIGN- ORS TO THE 3. A. FAY & Fifi-AN COMZPANY, OF CINCINLT A'IE, OHIO, A CORPORATION OF OHIO Application filed April 9, 1929.

Our invention relates to woodworking machines and moreparticularly to that class of machines generally known as straight line cut-off saws.

The primary object of our invention is to provide a straight line out off saw, the construction of which embodies the advantages of simplicity and ease of adjustment for the cutting of material at various angles.

l Vith reference to the preferred embodiment of our invention as applied to a straight line cut-off saw we provide a circular rotary saw, in association with means for supporting it, whereby it may be moved into and out of engagement with the work to be sawed, the supporting means being suitably mounted upon a column, which column, in turn, is pivotally mounted upon a stationary post, the latter being attached to the base "of the machine. Also secured to the stationary post is an indicating finger adapted to point to one of a plurality of marks disposed at various angles upon said column to facilitate the setting of the circular saw at the desired angle at which it is intended to out; further to provide means whereby the circular saw is revolvable about an axis central to the stationary post so that the point of en a ement of said saw with respect to the material to be cut, is the same, irrespective of its angular position.

Another object of our invention is to pro vide a column for a machine of this cha ractor which may be easily swiveled, clamped or unclamped upon the stationary post by the use of a single lever conveniently positioned under the front edge of the work supporting table.

Various other objects and advantages will become apparent as the description progresses as our invention further consists in the construction, combination, location and arrangement of parts as herein fully set forth and claimed.

In the drawings:

Fig. l is a front elevation of a straightline cut-01f saw embodying the features of our invention;

Fi 2 is a plan view thereof, parts being omitted and showing the column angled for Serial No. 353,768.

a 45 cut, the broken lines indicating the extreme forward movement of the saw;

Fig. 3 is aside elevation of Fig. 1, with parts appearing in vertical section, the broken lines indicating the extreme forward movement of the saw.

Fig. i is a side elevation similar to Fig. 3, with parts appearing in vertical section and parts omitted, illustrating the extreme forward movement of the saw and corresponding movements of the parts associated therewith; and

Fig. 5 is a cross section of the column clamp taken on a plane corresponding to line 55 of Fig 4.

In the embodiment of our invention as illustrated and which shows a preferred construction, let us refer to Fig. '3, wherein the numeral 1 represents the base of the machine to which is'a'fiixed, as indicated at 2, a hollow stationary post 3, the upper end of which is closed by wall 4, the purpose of which will be made apparent as this description proceeds.

Pivotally mounted upon the stationary hollow post 3 and resting at its lower sun face upon the base 1 at 5 is a column 6. This column 6 as clearly shown in Fig; "3 and F lg. 42, respectively is provided with vertically arranged guide posts 7, which posts slidably receive the slide 8 and yoke 21. The lower end of the curved arm 9 is pivotally connected at 9 to the arms 33 of slide 8, while the upper end of said arm is directly connected to the housing of motor 10 by bolts 11, the circular saw being indicated at 12 and directly connected to said motor 10. Also carried upon the housing of motor 10 is a guard 18 for the saw 12, said guard being removably held upon said motor housing by locking lever 13" and 14': is a handle by which an operator may draw the motor 10 and saw 12 forward to the position shown in Fig. L, or by dotted outline (Fig. 3), during the operation of sawing material, the saw and motor being returned to normal position, as shown by full linesin Fig. 8, by the weight of the several parts, namely; the slide 8, curved arm 9 and U-shaped link 26. The counterbalance mechanism for the curved arm 9 comprises tension springs 15, links 16 and rods 17. The lower ends of springs (Figs. 3 and 4, respectix ely) are pivotally attached at 18 to the links 16, and the upper ends of said springs are attadmd to brackets 29 (carried by yoke 21) through threaded bolts and nuts 31. One end of each link 16 is pivotally connected at 19 to the downwardly projecting arms 20, respectively, of yoke 21. The other end of each link 16 is pivotally connected at 22 to the upper end of rods 17, respectively, whereas the lower ends of each rod are pivotally connected at 23 to the slide 8, as clearly shown in Fig. 3. The purpose of this counterbalance mechanism is to compensate for the weight of the arm 9, U-shaped link 26 and slide 8, so as to enable the person operating the saw to pull it forward through the cut with very little 'rtl'ort.

Arm 24 is an integral part of the curved arm 9 and is pivotally connected at 25 to U-shaped link 26, the upper ends of said link 26, in turn, being pivotally attached at 237 to the horizontal a rnis of yoke 21.

In order to reduce friction to a minimum between the slide 8 and the guide post 7 we employ ballbearings 28, which are adapted to operate between said slide and said guide posts, as clearly shown. in Figs. 3 and 4, respectively.

The means for adjusting the circular saw 12 vertically to provide for varying" diameters of the saw, caused by sharpening or grinding, will now be described:

Rotatably journaled in a vertical bearing boss 34, formed upon the top of column 6, is a shaft 35, the lower end of which is pro vided with threads 36 and the upper end of which is supplied with a hand wheel 37 keyed thereto and prevented from longitudinal disengagement from said shaft by lock nuts 38. The threaded portion 36 of shaft is passed through the threaded hole 39 in boss 40, said boss being an integral part of the yoke 21, as clearly shown in Figs. 1, 3 and 4. It will, therefore, be apparent that by rotating the hand wheel 3'? the shaft 35 will be rotated and through the threaded end 36 thereof engaging the threaded hole in boss 40 of yoke 21, said yoke will be moved upwardly or downwardly upon the guide posts 8, depending upon the direction of rotation of the hand wheel 37 and thus said yoke 21, slide 8, curved arm 9, U-shaped link 26, motor 10 and saw 12 will be given a similar movement, as hereinbefore described, on the guide posts 7.

By a careful examination of Figs. 3 and 4,

7?, it will be readily apparent that the weight of yoke 21, slide 8, arm 9 and U-shaped link 26 and associated parts attached thereto, are carried by the threads 31 of shaft 35. Therefore, when the shaft is rotated in a clockwise direction by hand wheel 37, the threads 36 thereof will move boss 40 upwardly thereon, thus moving the yoke 21 upward upon the guide osts 7 and through the U-shaped link 26 and arm 9 the slide 8 is given a corresponding upward movement upon the guide posts 7 and when said hand wheel 37 is rotated in an anti-clockwise direction, these parts will be moved downwardly upon the guide posts 7, as will be clearly seen by the position of yoke 21 in Fig. 3, and its position shown in Fig. 4.

Fixed to the column 6 is a chute 41, for the purpose of catching waste material, such as sawdust. Said chute extends under the table (not shown) and travels with the saw when it is angled. As before stated, the column 6 is ivotally mounted upon the stationary hol ow post 3, the weight or load of said column being carried by thrust bearing 42, disc 43, hollow screw 44 and cap 45, said cap being rigidly attached to the column. 6 by bolts 46, as clearly shown in Fig. 3. Pin 47 extends through the hollow screw 44, the lower end being forced within hole 4 in wall 4 and the upper end carrying indicat ing finger 48. This indicating finger 48, in connection with the spaced apart marks 49 upon cap facilitates the adjustment or setting of the saw 12 to the desired angle at which it is intended to cut.

Upon swinging the column 6 about post 3 to the desired angle at which the saw 12 is intended to cut said column 6 can be clamped to said stationary hollow post 3 by 0 crating the combined clamping and swivel ever 50, clearly illustrated in Fig. 3. This lever 50, when raised upwardly, draws the split sections 51 of column 6 tightly about the hollow post 3 in the following manner. Bolt 50 is passed through the split sections 51, as shown in Fig. 5, one end of said bolt being threaded to receive nut 50 and the other end of said bolt being provided with a head 50. Lever 50 is securely fixed to said bolt 5O by means of a pin 50 and nut 50 is held against turning by screw 50. Therefore, it will be apparent that when said lever 50 is depressed the bolt 50 will be slightly turned within nut 50" in such a manner as to free the split sections 51 of column 6 and permit said column to move or swing upon the post 3 to change the angle of the saw 12. This angling movement of said columnmay also be accomplished by the lever 50. A rubber bumper 52, is mounted within a depression 53, formed in the slide 8, and held therein by screw 54, said bumper serving to absorb the shock of the curved arm 9 when returning to its normal position shown by full lines in Fig. 3.

The operation of the machine is as follows:

Assume that a board 55, indicated in dotted outline, Fig. 3, to be sawed is placed upon the work supporting table and if it is to be sawed at an angle the circular saw IOU CID

.; saw 12, as hereinbefore described, may be adjusted for vertical position by rotating the hand wheel 37.

Assuming that the column 6 has been adjusted to the proper angle at which the saw 12 is intended to cut; the saw is then caused to revolve by closing the circuit to the motor whereupon the saw may be drawn forward across the board 55 to the position shown by dotted lines, Fig. 8, or by full 0 lines in Fig. 4, by the operator grasping the handle 14, attached to the housing of motor 10. This forward movement of the handle 14, in turn, moves the slide 8 upwardly upon the guide posts 7 from the position shown in Fig. 3 to the position shown in Fig. 4, said tension springs 15 serving to counterbalance the weight of curved arm 9, U-shaped link 26 and slide 8. After the board has been out the saw 12, arm 9,

d-shaped link 26 and slide 8 will return from the position shown in Fig. 4 to their normal positions (shown by full lines in Fig. 3) by the weight of the several parts, as hereinbefore described, and rubber bumper 52, will serve to reduce or absorb the shock of the curved arm 9 when returning to its said normal position. If, for any reason, the bearing surfaces between the column 6 and base 1, at 5, should Wear the column 6 may be lowered upon the hollow stationary post 3 upon loosening the lock nut 44 and turning the hollow screw 44 in an anti-clockwise direction, or a direction to partially Witl'idraw it from the cap 45, whereupon 7'} the lock nut 44 may again be tightened after said adjustment has been made.

An advantage of this invention is that the entire machine angles 45 to the right and 45 to the left pivoting about the inter section point of the saw and fence line, whereas it is not necessary to draw back the fence when setting the saw for an angle cut, as has heretofore been the case, and to angle the saw the operator merely lowers 1 the lever 50, conveniently located under the front edge of the table, and swivels the column, which pivots about the hollow post 3 in the base 1.

As heretofore stated, a ball-thrust bearing 43 carries the load of the column and parts associated therewith, thus making angling easy and convenient by use of the hand lever 50.

Another advantage of this invention is that the operator can pull the saw through the cut with less than a finger strength, due to the counterbalance mechanism and the three members, namely; the slide 8, curved arm 9 and U-shaped link 26.

Still another advantage of this invention is the simplicity of the means for adjusting the saw vertically to provide for varying diameters of the saw caused by sharpening or grinding.

It will be understood that certain changes and modifications of the invention can be made without departing from the scope or spirit thereof as defined in the claims.

What we claim as new and desire to secure by Letters Patent is:

1. A straight line cutoff saw comprisin in combination a base having a hollow stationary post, a column pivoted thereon, a vertically arranged guide post carried by said column, a slide slidably mounted upon said post, a yoke supported upon said post an arm pivotally attached to said slide, a link pivotally connecting said arm with said yoke a cutter carried by the upper end of said arm, and means for locking and unlocking said column upon said post.

.2. In a straight line cut-off saw, the combination of a base having an upright post near its forward end, a column pivotally mounted upon said post and supported thereby, vertically arranged guide posts carried by said column, a slide mounted upon said posts, an arm pivoted to said slide, a yoke slidably mounted upon said posts, means for adjusting said yoke vertically within said column, means connecting said yoke with said arm, a circular saw, a motor attached to the upper end of said arm to drive said saw, and means forlocking said column upon said post.

3. In a straight line cut-off saw, the combination of a'base, a column pivotally mounted upon said base, guide posts carried by said column, a slide mounted upon said posts for vertical movement thereon, a yoke mounted upon said posts, means adapted to adjust said yoke vertically upon said posts, an arm, the lower end of which is pivotally attached to said slide, a link, one end of which is pivotally attached to said yoke and the other end of which is pivotally attached to said arm, counterbalance means connecting said yoke with said slide, a motor directly carried by said arm, a circular saw adapted to be rotated by said motor, and a hand lever adapted to clamp said column upon said base in various angular positions to permit said saw to be passed through the work to be cut at various desired angles.

4. In a straight line out off saw, the combination of a base, a column pivotally mounted upon said base, vertically arranged guide posts carried by said column, a slide mounted on said posts, a curved arm, the lower end of which is pivotally connected to said slide, a yoke mounted upon said posts,

means pivotally connecting said yoke with said arm, a motor attached to the upper end of said arm, a circular saw attached to sa1d motor, and means for moving said column upon its pivot point to various angles, said saw travel being co-incident with the pivotal axis of said column irrespective of the angular osition to which said column is set upon sai base.

5. In a straight line out off saw, the combination of a base having an upright post, a column mounted for angular adjustment upon said post, vertically arranged guide postscarried by said column, a slide mounted upon said vertically arranged guide posts,

an arm pivoted at its lower end to said slide,

a yoke mounted upon said vertically arranged guide posts in such a manner as to 1 be capable of adjusting vertically thereon,

means for adjusting said yoke vertically upon said guide posts, means connecting said yoke with said arm comprising a U-shaped link, a motor attached to the upper end of 20 said arm, a saw attached to said motor and adapted to be rotated thereby and counterbalance means connecting said slide with said oke.

6. In a straight line out ofli' saw, the com- 25 bination of a base having an upwardly extending hollow post, a column pivotally received upon said post, means for adjusting said column vertically upon said hollow post comprising a thrust bearing carried by said 33 post, a disc resting upon said thrust bearing, a threaded bolt, the lower end of which is adapted to rest upon said disc and the threaded portion of which engages a corresponding threaded portion within said column whereby when said bolt is rotated within said column, said column is raised or lowered with respect to said base, depending upon the direction in which said hollow bolt is rotated.

FREDERICK J. KIS'INER. WILLIAM S. WILLIAMS.

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