US2656738A

US2656738A - Pulpwood saw grinder

Info

Publication number: US2656738A
Application number: US199308A
Authority: US
Inventors: Robert L Tomlin
Original assignee: Individual
Current assignee: Individual
Priority date: 1950-12-05
Filing date: 1950-12-05
Publication date: 1953-10-27
Anticipated expiration: 1970-10-27

Description

R. L. TOMLIN PULPWOOD SAW GRINDER 2 sheets-sheet 1 Oct 27, 1953 med on. 5. 195o INVENTOR. Foefer-L, 722ML v oct. 27, 1953 Filed Dec. 5, 1950 R. L.. ToMLlN 2,656,738

PULPWOOD SAW GRINDER 2 sheers-sheer 2 INVENTOR. Fasi/w' fana/w Patented Oct. 27, 1953 UNITED STATES ,PATENT OFFICE PULPWOOD SAW GRINDER Robert L. Tomlin, Savannah, Ga. Application December 5, 1950, Serial No. 199,308

(Cl. i6- 37) 4 Claims.

This invention relates to saw-sharpening devicesy and more particularly to a sharpening attachment for use on portable rotary power saws.

A main object of the invention is to provide a novel and improved blade-sharpening attachment for use on a power-driven saw, such as a pulpwood saw, said attachment being simple in construction, being easy to mount on a standard power-driven saw, being easy to operate and providing accurate sharpening of the teeth of the saw with which the attachment is used.

A further object of the invention is to provide an improved blade-sharpening attachment for a portable power-driven rotary saw, such as a pulpwood saw or the like, said attachment involving relatively few parts, being sturdy in construction being easy to adjust, being usable without requiring the blade to be sharpened to be removedL from the saw, and providing more accurate sharpening of a saw blade than is obtainable by hand filing.

Further objects and advantages of the invention will become apparent from the following description and claims, and from the accompanying drawings, wherein:

Figure 1 is a perspective dotted view of a conventional power-driven pulpwood saw having an improved blade-sharpening attachment, shown in full line view installed thereon;

Figure 2 is an enlarged, fragmentary, top plan View of the blade-sharpening attachment shown in Figure 1;

Figure 3 is a perspective view of the bladesharpening attachment of Figures l and 2;

Figure l is a cross-sectional, detail view taken on line 4-4 of Figure 2;

Figure 5 is an enlarged, cross-sectional, detail `view taken on line 5-5 of Figure 4.

Referring to the drawings, generally designates a conventional. pulpwood saw of the type having a forwardly extending frame member |2 to the end of which is transversely secured a sleeve or bearing member I3 in which is journaled a shaft or mandrel I4 on which the blade I5 is secured. Designated at I6 is a gasoline engine whose crankshaft is coupled to the shaft I4, as by a belt II and suitable pulleys, not shown, provided on the motor crankshaft and on the shaft I4.

The blade-sharpening attachment comprises a tubular standard I8 provided at its lower end with a clamping sleeve adapted to embrace the sleeve member I3 and rigidly secure the standard I8 thereto in the manner shownY in Figure 1. Said clamping sleeve may comprise an upper segment I9 integral with the standard I8 and a lower segment 20 hinged to one margin of segment I9 and secured to the opposite margin of segment I8 by a clamping bolt extending through

respective flanges

22 and 23 provided on segments 26 and I9.

Designated at 24 is a screw member which is slidably and rotatably received in the tubular standard I8. Designated at 25 is a gear journaled between parallel supporting lugs 26 and 2'! formed on standard I8, said standard being slotted between the lugs 26 and 2'I, whereby the gear 25 projects inside the standard and meshes with the screw member 24. The shaft of the gear 2li is shown at 28, said shaft extending through the lug 26 and being formed at its end with the transverse bar 29 provided with the respective handles 3l), 3|), as shown in Figure '3.

The top end of the tubular standard I8 is formed with a horizontal flange 3|. Flange 3| is formed with an arcuate slot 32 concentric with the axis of the tubular standard I8. Designated at 33 is a clamping collar surrounding the screw member 24 and provided with respective

parallel lugs

34, 34 through which is engaged the clamping bolt 35 adapted to secure the

lugs

34, 34 together and to cause the clamping collar 33 to exert clamping pressure on the screw member 24, Collar 33 is formed with a horizontal arm 36 which extends over the flange 3| and which carries the bolt 31 engaged through slot 32, as shown in Figure 5, whereby the arm 35 may be clamped to the flange 3|. It will be apparent that the vertical position of the screw member 24 may be adjusted by loosening the clamping screw 35 and rotating the gear 25 by means of the

handles

36, 30, the screw member 24 being locked in its adjusted vertical position by tightening the bolt 35. It will be further apparent that the screw member 24 may then be adjusted around its axis by loosening the bolt 31 and rotating the clamping collar 33 with the screw member 24 clamped therein. Rotation of the arm 36 causes the bolt 31 to move through the arcuate slot 32. The arm 36 may be clamped in a desired position of adjustment relative to the flange 3| by tightening the bolt 3T.. It will `be apparent that the above-described structure provides both vertical adjustmentof the screw member 24 and angular adjustment of said screw member around it own axis.

Designated at 39 is a yoke member which is rigidly secured to the top end of the screw member 24. Designated at 4|! is a clamping sleeve formed with the laterally extending, opposed bearing lugs 4|, 4| which are respectively engaged at their ends by

pivot screws

42, 42 threaded through :and locked to the

upstanding arms

43, 43 of the yoke member 39. Designated at 44 is an arm' which is received in the clamping sleeve 40. Sleeve 4i) is provided with upstand parallel

marginal lugs

45, 45 through which extends a clamping screw 46, whereby the arm 44 may be,` clampedV in the sleeve 40 in any desired position ofy yangular adjustment around its own axis. The end of arm 44 has secured thereto a bearing sleeve 4l' in which is journaled anV arbor 48 in which is axially secured the shaft 49. Secured to shaft 49 is the emery grinding disc 50.

Designated at l is an arm integral with the yoke member 35 and extending therefrom in underlying relation with respect to the arm 44;. Threaded through the end of arm 5l is a stop screw 52 whose top end underlies the bearing sleeve 4l. Screw'52 is provided with a lock nut 53 and with an Yadjusting handle or knob 54.

'Designated at 55 is a coil spring whose lower end is seated in a cup member 56 carried by the arm 5| and whose upper' end engages around. a depending lug 5l formed on a collar 58 clamped to the arm 44. The spring 55 biases the ann d4 upwardly, and the stop screw 52 limits Vdownward movement of the bearing sleeve F51. Designated at 59 is a radially projecting handle carried by the bearing sleeve 4l, whereby the bearing sleeve andl the grin-ding disc 59 jcurnaled thereto may be manually depressed. 1t will be ap- Vparent from the above description that the anpower saw, in the mannershown in Figure. 1,

whereby the grinding wheel 50 will be arranged adjacent the periphery of the saw blade t5. The end of the shaft 49 is connected by a exible coupling shaft, shown in dotted View at 59, to

the crankshaft of motor |S- either directly or through` a suitable shaft and pulley arrangement.

After the teeth have been struck, as above described, the motor is stopped and the clamping screw 46 is loosened. The arm 44 is rotated so that the wheel 50 is adjusted to the desired toothhook angle. After the blade 50 has been adjusted to said desired tooth-hook angle, the clamping screw 45 is tightened. The lock nut 53 is then loosened and the stop screw 52 is lowered to provide the desired grinding `depth, of the emery wheelY 50. The said grinding depth will be in accordance with the desired length of saw teeth. When the screw 52 has been set to the desired stop position, the lock nut 53 is tightened. The motor is then started and the saw teeth are gummed up to the points that were struck off in the preceding stage of the operation.

After the. saw teeth have been gummed the Abolt 31 isV loosened and the screw member 24 is rotated by means of arm 35, so as to provide the desired sharpening angle of the emery wheel 50. When thev desired sharpening angle has been obtained, the bolt 3-1 is tightened to lock the clamping collar 33 in the correct position. for providing said desired sharpening angle. When the sharpening angle has been set, as above described, the teeth may be beveled by grinding, the

face of one tooth and the back of the next ad- The clamping segments t9 and 2.5' secure the entire attachment in an upstanding position, such as that shown in Figure l.

The rst step in the blade-sharpening process consists of striking or jointing the teeth of the blade. To accomplish this, the clamping screw is first loosened and the grinding blade 5i] is elevated by rotating the handles. 30, 30 until the wheel 5@ is aboutthree inches above the top ofthe saw teeth. The sore-w35 is then tightened. The lock nut 53fis` thenloosened and the screw 52 is'then set to a positionwherein thegrinding wheel 505 may be depressed sufficiently tov engage all the points ofv thesaw blade teeth. The'lock nut 53 is then tightenedand the engine is started. The grinding wheel 5l)v is depressed by meansy of a handle 59, the saw blade being,Y of course, uncoupledv from the engine I6-to allow the blade to be manually rotated. With thegrinding wheel 50 in its depressed position,l the bladeV I5v is slowly rotated clockwise, as viewed in Figure 1, by hand until all of the-points of the blade teeth have been struck, whereby the saw teeth are of equalradial distancefromA the blade axis;

jacent tooth. For beveling from the opposite side of the saw blade, the same procedure is used, except that the grinding wheel is turned in the proper direction to provide beveling for said opposite side of the saw blade.

While a speci-ric embodiment of an improved blade-sharpening attachment for rotary power saws has been disclosed in the foregoing description, it will -be understood that various modifications within the spirit of the invention may occur to those skilled in the art. Therefore, it is intended that no limitations be placed on the invention exceptv as defined by the scope rof the appended claims.

What is claimed is:

1. A blade-sharpening attachment, comprising a tubular standard, means on said standard clampingly engageable with the frameyof a circular saw adjacent to the rotary saw blade, a rack bar slidably disposed in said standard, a manually rotatable gear journaled onV said standard and meshing with said rack bar, a clamp'on said standard lockingly engageable with said rack bar, a yoke member at the endof said rack bar, an arm pivoted in said yoke member, a grinding wheel rotatably mounted on the end of said arm, and a flexible shaft connected to said grinding wheel, said shaft being adapted to be connected to a source of power.

2. A blade-sharpeningattachment, comprising a tubular standard, means on said standard clampingly engageable with the frame of a circular saw adjacent Ytoy the rotary saw blade, a rack bar slidably disposed in. saidv standard, a manually rotatable gear journaled on'said standard and meshing with said rack bar, a clamp on said standard lockingly engageable with said rack bar, a yoke member at the end of said rack bar, a sleeve pivoted in said yoke member, an arm disposed in' said sleeve, means on said sleeve clampingly locking said arm, a grinding wheel Y rotatably mounted on the end of said arm, and ailexible sha-ft connected to saidgrinding wheel, saidshaft being adapted to be connected to a source of power.

3. A blade-sharpening attachment, comprising a` tubular. standard, means on said" standard clampingly engageable with the frame of a circular saw adjacent to the rotary saw blade, a rack bar slidably disposed in said standard, a manually rotatable gear journaled on said standard and meshing with said rack bar, a clamp on said standard lockingly engageable with said rack bar, a yoke member at the end of said rack bar, a sleeve pivoted in said yoke member, an arm disposed in said sleeve, means on said sleeve clampingly locking said arm, a projection on said yoke member extending beneath and adjacent to said arm, an adjustable stop member carried by said projection and being engageable by said arm to limit the downward movement thereof, spring means between the arm and the projection and biasing the arm 11pwardly, the grinding wheel rotatably mounted on the end of said arm, and a flexible shaft connected to said grinding Wheel, said shaft being adapted to be connected to a source of power.

4. A blade-sharpening attachment, comprising a tubular standard, means on said standard clampingly engageable with the frame of a circular saw adjacent to the rotary saw blade, a rack bar having a circular cross-section slidably and rotatably disposed in said standard, a manually rotatable gear journaled on said standard and meshing with said rack bar, a clamp in said standard lockingly engageable with said rack bar, said clamp being arranged to be rotated around the axis of the standard, means locking said clamp in adjusted rotated position around said axis, a yoke member at the end of said rack bar, a sleeve pivoted in said yoke member, an arm disposed in said sleeve, means on said sleeve clampingly locking said arm, a projection on said yoke member extending beneath and adjacent to said arm, an adjustable stop member carried by said projection and being engageable by said arm to limit downward movement thereof, spring means between the arm and projection biasing the arm upwardly, a grinding Wheel rotatably mounted on the end of said arm, and a flexible shaft connected to said grinding wheel, said shaft being adapted to be connected to a source of power.

ROBERT L. TOMLIN.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 146,392 Jackson Jan. 13 1874 1,385,175 Jones at al July 19, 1921 1,671,217 Bachman May 29, 1928 2,217,145 Stihl Oct. 8, 1940