US1415247A - Lumber jack saw - Google Patents

Description

H. A. KNOWLES.

LUMBER JACKSAW.

APPLICATION FILED SEPT- 3 0. 1920.

Patented May 9, 1922.

2 suserssukn I, u l J 7 ii 57 V I I 5.5 .73 ff 7 11/ Ill/VENTOR Iii/[.Knozylas A TTORNEYS H. A. KNOWLES.

LUMBER JACKSAW.

APPLICATION FILEDISEPT. so. 1920.

Patented May '9, 1922.

2 SHEETS-SHEET Z INVENTOR fiT/l .fiizaa fles ATTORNEYS TEN Ff lfi.

nABvE ALLEN KNOWLES, or srooirroa'r, IOWA.

LUMBERJ GK saw.

Application filed September 30, 1920. [Serial Nol 413,720.

T 0 aZZw/wm it may concern:

Be it known that l, 'l-lnnvn ALLEN KNoWLns, a-citizen of the United States, and a resident of Stockport, in the county of Van Buren and State of Iowa, have invented a new and useful Improvement in a Lumber Jack Saw, of which the following is a full, clear, and-exact description My invention relates to improvements in lumber jack saws, and it consists in the combinations, constructions, and arrangements herein described and claimed. 'An object of my invention i to provide an automatic saw that has means for holding the cutting member thereof in constant operative engagement with the work.

A further object of my invention is to provide a device of the type described that has means for removably securing the device in position to engage with either horizontally, vertically, or obliquely disposed work.

A further object of my invention is to provide a device of the type described having a saw blade of a chain type and provided with means operable at will to lock the same in inoperative position.

A further object of my invention is to provide a device of the type describedthat is relatively simple in construction and operation, light in weight and therefore readily portable, and thoroughly practical commercially.

Other objects and advantages will appear in the following specification, and the novel features of the invention will be particularly pointed out in the appended claims.

My invention is illustrated in the accompanying drawings, forming part of this tip plication, in which Fig. 1 is a plan view of the device,

Fig. 2 is a section along the line 22 of Fig. l,

Fig. 3 is an enlarged horizontal section through a fragmentary portion of the de vice,

Fig. 4: is an enlarged orthographic pro1ection of a fragmentary portion of the device,

Fig. 5 is a section along the line 5+5 of Fig. 4:, V

Fig. 6 is a detail of another fragmentary portion of the device.

In carrying out my invention I provide; a suitable saw frame consisting of side membersj1-1, cross pieces2-2, and intermediate members '3 and iconnectedto the side and end members to form a supportvfo'r a motor 5. The frame may vary considerably in construction without departing from the spirit of. myinvention. v v

A pulley 6 carried by the drive shaft 7 of the motor engages with a belt 8 which in turn engages with a pulley 9. mounted on-a driven shaft 10 to occasion the operation of the latter. The drivenshaft 10 is jcurnalled in the hub 11 of a disk 12. The hub 11 is iournalled in a bearing 13 secured to the outer wall of one of the frame members 1:-l by screws 14 and extendsthr'ough an opening 15 in the same side member. The inner end of the hub 11 therefore projects within the interior ofthe frame while the disk 12 ispositioned exteriorly of the frame, being spaced from the side member thereof by the bearing 18. The bearingll which is disklike in form has an integral offset ring extension 16 having an outer diameter greater than that of the bearing 1.3 to define an annular rib 17. The inner diameter of the ring extension 16 is slightly greater than the outer diameter of the disk 12, wherefore the inner wallof the ring extension 16 and the outer-wall of the bearing 18 together form the wall of a socket in which the disk 12 is arranged ures 3 and 5). I i

The outer end of the driven shaft 10 pro- Jecting exteriorly of the disk is enlarged at 18, thereby providing a shoulder 19 abutting against the disk 12 to maintain the latter 1n the position shown and carries at its end to rotate as shown (see v a sprocket 20. A cap consisting oft vo half portions 21 and 22 provided respectively with precisely identical cooperating semi-circular recesses 23-23, each conforming in outline with the enlarged portion of the driven shaft -10 is mounted for rotation. on the enlarged end portion 18 of the driven shaft 10 between the'sprocket and the disk, the half portions ofthe cap being held relative to each other by means of pins 24 projected through the same into the disk;12, wherefore the cap is held to rotate with the disk 12. The cap so formed has an integral cylindrical portion 25 extending; toward the frame member 1 and housing the bearing 13, the inner wall of the cylindrical portion 25 being recessed at=26 to receive the annular rib 17. The

caphas its outer wall provided with a guide 28. ia -fashioned with an elongated central carrying plate 28. .An outer carrying plate 31 that is similar to the inner carrying plate 28, is disposed parallel therewith, being spaced laterally therefrom by a spacing member 32. Bolts 33 extending through the spacing member 32 connect the inner and outer carrying plates.

The web of the U-shaped bar member 30 is positioned laterally of the cap and is grooved intermediate its length to partially receive interiorly threaded rotatable sleeve 34. The latter is formed with an annular groove in its outer wall, as best seen in Fig. 4, and a bar or strap 35 secured to the web of the member 30 engages this groove to hold the sleeve against movement axially preventing rotation thereof. The sleeve 34 has an integral portion 38 axially alined therewith and having the form of a knurled nut. A threaded rod 36 is screwed through the nut portion 38 and the sleeve 34 and is then secured at'37 betweenthe inner and outer carrying plates. When the knurled nut portion 38 and the sleeve 34 are turned the threaded rod 36 will be moved axially, thereby moving thecarrying plates 28 and 31 relative the web of the U-shaped member 30.

Referring now particularly to Fig. 3, it

v i will be noted that I provide means carried by the carrying plates 28 and 31 for supporting and guiding a saw 39 that is of the end less chain type and is driven by the sprocket 20. These means comprise a pair of spaced apart normally vertical guide bars 40 and 41 that have their inner ends secured to the carrying plates 28 and 31, respectively at a point diametrically opposed to the web of the -U-shaped member 30. A sprocket 42 around which the chain saw 39 passes is journalled at 43 between the outer ends of the guide bars 40 and 41 adjacent the outer ends of the latter. A third or intermediate guide bar 44 that has a width and length I less than the width and length of the guide bars 40 and 41 is disposed between the same,

and supports the chain saw 39 that has its chain or. unserrated edge slidable thereon. The guide bars 40, 41 and 44 are secured together in any suitable manner as by means of bolts 45.

An arm 46 having its lower end secured by bolts 47 and 24 to the cap and to the adjacent arm of the U-shaped member 30 has its upper end formed into a handle 47 adapted to be grasped with the cooperating hand grip 4.8 tha i pi ed th reto as as o use a the work.

pins 58.

pawl 49 connectedto the hand grip 48 by a rod 50 to be moved outwardly, thereby disengaging the fixed bearing 13 to permit rotatable movement of the cap or housing thereabout. The pawl 49, which projects through an opening 51 in the wall of the cylindrical portion of the cap, normally engages with the walls of a notch 52 in the ring 17 to prevent'movement of the housing or cap and the parts rigidlv connected thereto relative the bearing 13 (see Fig. 4). Y

Referring now to Figures 2 and 3, it will be observed that I mount a spring motor on the portion of the hub 11 disposed within the 1 frame for moving the disk 12 and parts connected thereto, including the carrying plates 28 and 31 and the guide plates 40,41, and 44, rotatably in one direction about the driven shaft 10. This spring motor comprises a housing 53 fixedly secured to the side frame member 1 in any suitable 'manner as by screws 54 and a spring 55 under tension disposed within thehousing and arranged to have its outer end secured to the interior wall of the housing at 56 and its inner end secured to the hub 11 at 57, wherefore the action of v the spring tends to rotate the hub in one direction, which with the arrangement shown in the drawings, would be a counterclockwise movement.

I also provide meansfor maintaining the frame in a desired positionwith respect to These means comprise. sharp pointed headed anchoring pins 58 slidably maintained in the position shown relative the side frame members 1-1 by retaining clips 59-59 and 60-60 which are secured to the frame members 11. The retaining clips 6060 each comprise a substantially U- shaped member having spring qualities and having the pin 58 held between the inner arm which is secured to the frame member 1 and the outer free arm. A nut 61 screwing on a threaded rod 62 that extends transversely through the arms of each of the clips 60-60 into a frame member 1 provides a means for moving the outer arm-toward the inner arm, thereby locking the frame to the In addition, a rod 63 secured to the frame at 64 and 65 extends therebeyond and is provided with a handle 66 secured thereto intermediate the length of the latter. The handle 66 provides a means adapted to be grasped when moving the device and also 7 above the other. The anchoring pins 58 are i driven into the Work at predetermined points to aline the saw blade with the point at which the kerf is to be made. The frame is then locked or secured to the anchoring pins 58 by operating the nuts 61 in the manner described. One end of the handle 66 is then driven into the ground or braced in any suitable manner to prevent displacement of the frame. The handles 4:? and 48 are then grasped and operated to withdraw the pawl 49 from engagement with the bearing 13. The action of the spring motor then swings the serrated edge of the chain saw 39 against the work and tends to force the blade transversely through the work as the chain is driven. This is accomplished by operating the motor 5 to rotate the driven shaft 10 and the sprocket 20. When the cutting operation is completed, the chain saw is swung out of engagement with the work by manually operating the arm 46. The handles 47 and 48 are then operated to permit the pawl 49 to enter the notch 52 and thereby prevent further movement of the latter relative the bearing 17.

The operation of the device in sawing work disposed horizontally or obliquely will be understood without any detailed explana tion since it is the same in essential respects as the operation described for sawing vertically disposed work.

The device provides a practical effective means for automatically performing functions that ordinarily require manual labor and considerable time for their accomplishment. One of the principal advantages of the device lies in the fact that the device is light in weight and readily portable. It may therefore be used for performing the functions of an ordinary hand saw as well as those of a heavy complicated power saw. Operation of the knurled nut 38 will adjust the tension of the carrying and guiding members on the chain saw 89 and thereby insure the satisfactory operation of the latter.

I claim:

1. A power saw comprising a substantially rectangular frame, a rotatable disk disposed exteriorly of a side member of the frame and having a hub extending through the side member of the frame into the interior thereof, a transverse rotatable shaft journalled in the hub and having its outer end extended beyond the disk, a bearing for said disk, said bearing being secured to the adjacent side member of the frame, a cap arranged to loosely receive said bearing and being secured to the disk to rotate therewith, said cap being formed with a guideway in the outer wall of the top thereof, carrying means slidably disposed in said guideway, longitudinal carrying and guiding member secured to said first named carrying means and substantially alined therewith, an end less chain saw arranged to be operated by said shaft and being passed around the outer ends of said carrying and guiding members, means for slidably moving said carrying means relatively to said cap to adjust the effective length of said chain saw, means for anchoring said frame in a desired position relative to the work to be engaged, means for operating the shaft, and a spring motor mounted on said hub and tending to rotate the same to rotate said cap and thereby constantly move said saw blade in the direction to operatively engage the work.

2. A sawing device comprising a frame, a rotatable shaft journalled in the frame, a sprocket rigidly mounted on the shaft, an endless chain saw passed around the sprocket and additional chain saw supporting and guiding means carried by the frame and including members arranged for slidable movement transversely of the shaft and for movement about the shaft as a pivot.

3. A sawing device comprising a frame, a rotatable disk having a hub journalled in the frame, a rotatable shaft journalled in the hub and having its outer end extended beyond the disk, a cap secured to the disk to rotate therewith, said cap being formed with a guideway in the outer face thereof, a sprocket rigidly mounted on the shaft at its outer end, an endless chain saw passed around the sprocket, other saw carrying HARVE ALLEN KNOWLES.

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