Nov. l2, 1946. - A._ R. LoFsTRAND, JR l2,410,828 CHAIN SAW _SHARPENERl Filed Nov. 19, 1943 4 Sheets-Sheet 1 z/ i. zä _f nu IZ / y. lz 'fìil , l Lm JÍÉÃ o/si'?’an 55% ~ N0V~ l2, 1946. A. R. LoFsTRANb, JR 2,410,828 CHAIN SAW SHARPENER _ Filed NOV. 19, 1943 -4 "sheets-smeetv 2 NOV- l2, 1946- A. R. LOFSTRAND, JR 2,410,828 CHAIÑ sAw SHARPENER Filed Nov. 19, 1943 ' 4 Sheets-Sheet 3 427. Jlh h if Nov. l2, 1946. A. Rl. I_OFSTRAND,` JR 2,410,828 CHA-IN SAW SHARlA’ENER Filed NOV. 19, 1943 4 Sheets-Sheet 75 .l b 46 ,55 3/ m Patentecl Nov. 12, 1946 2,410,828 -UNITED STATES PATENT OFFICE 2,410,828 CHAliN SAW SHARPENER Anders R. Lofstrand, Jr., Silver Spring, Md. Application November 19, 1943, Serial No. 510,948 5 Ciaims. (Cl. 51--92) ì 2 ì This invention relates to a sharpening device for sharpening chain saws. , ` ' gauge or index for determining one angular posi ' tion of the carriage. » ' f Referring to the drawings, the numeral l5 des saw lSharpener wherein the work is clamped on a ignates generally a frame structure which in vertically movable support, the support being ad 5 cludes an upright frame Vmember lâ having formed integral with the upper end thereof Aan justable to varying angles so that all of the teeth angularly extending table ll. A rearwardly ex of the saw may be cut at the desired or proper tending stationary- clamp i3 extends from the angle. . rear side of the vertical member it and an ad Another obj ect of this invention is to provide a justable threaded clamping memberl 19 is chain saw Sharpener which is portable, being threaded through a rearwardly extending arm 26 capable of being clamped onto any suitable supcarried by the lower portion of the vertical frame port, and which may be operated by means lof an An object of this invention is to provide a chain air motor, an electric motor, an internal com member I6 so that the frame l5 may .be clamped bustion engine, or any suitable and available 15 power device. onto a support S. A further object of this invention is to provide a device of this kind which can be accurately set in right-angularly related planes so that the de sired cutting angle may be formed on the teeth of the saw. f ,I > The table or plate Il is adapted `to have se cured to the upper side thereof a spindle or grinder shaft 2l. In the present instance, the grinder shaft vill is formed as part of an air motor 22 which is bolted to the upper side of the sup~ porting plate or table Il.A Where an electric mo tor is used, the spindle 2l may be journaled in a bearing secured to the table l1 and the same is true where the spindle 2l is rotated by means of an internal combustion engine or other suit A further object of this invention is to provide an improved clamp for clamping the chain saw in proper position for grinding the teeth thereof. With the foregoing objects and others whichl able power device. ' ' I may hereinafter appear, the invention consists of 25 The- air motor 22 includes a spring-pressed nor-' the novel construction, combination and arrange mally closed valve 23 which is adapted to be movedment of parts as will be more specifically referred into open 'position by means of a horizontally to and illustrated in the accompanying draw ings, wherein is shown an embodiment of the 30 swingable lever 24 provided with a cam‘member 25 engageable with the valve member 23 when invention, but it is to be understood that changes, the lever 24 is rotated or swung in a counter modifications and variations may be resorted to clockwise direction. An abrasive wheel 2t is se which fall within the scope of the invention as curedto the spindle or drive shaft 2l and the claimed. In the drawings: - » Figure 1 is a detail front elevation partly in sec tion of a chain saw Sharpener embodying this invention, Figure 2 is a top plan partly broken away and in section of the device, ' Figure 3 is a detail side elevation of the device, Figure 4 is a detail side elevation partly in vern wheel 26 has mounted thereabout a guard or shield 21; The guard or shield y2l is carried'by a cylindrical clamp 23 having rearwardly extend ing ears 29 which are drawn together by means of a pressure bolt 29a so that the guard or shield 21 may be disposed in the proper position. VThe 40 guard or shield 2l is positioned to expose the wheel 25 on the lower side thereof so that the teeth of Va chain saw mounted on a vertically tical section of the device on the side opposite l movable carriage may be properly sharpened. from that shown in Figure 3, y . The frame l5 includes a forwardly extending Figure 5 is a fragmentary sectional View taken 45 arm 30 at the lower end of the vertical frame on the line 5_5 of Figure 1, membei` 16 and a cylindrical guide 3l is carried VVFigure 6 is a sectional View taken on the line 6-3 of Figure 1, . , by the forward end of the arm 39. The guide 3l at the upper end thereof has formed integral ` Figure 7 is a sectional View taken- on the line therewith an annular plate 32 and the plate 32 Y 50 constitutes a limit means for limiting the down 1--1 of Figure 1, Figure 8 is a fragmentary sectional view taken on the line 8-8 of Figure 3,v Figure 9 is a sectional View taken on the line ward movement of a saw carriage, generally des ignated as 33. The carriage 33 includes a vertically slidable 9`-“`--f9,of Figure 3, and shaftßt which is slidable in the bore 35 of the i _ , Figure lll-is a-'fragmentaryr plan viewo'f the 55 bushing or guide 3|. An annular plate 36 is se 2,410,828 4 3 larly adjusted position by means of a thumb nut 69 which is threaded on a bolt 18. The bolt 10 extends through an arcuate slot 1| formed in the cured by means of a bolt or cap screw 31 at the upper end of the shaft 34, and preferably, the plate 36 is formed with a socket or downwardly opening recess 38 within which the upper end of the shaft 34 is adapted to engage. The shaft 34 adjacent the upper end thereof is formed with an annular groove39, and a half-circular clamp ~ vertical plate 68 and a spacer sleeve 12 is inter posed between the forward side of the plate 60 and the rear side of the clamping plate 65. A pointer 13 is secured to the rear side of the clamp ing collar 40 engages in the groove 39. A pressure screw 4| is threaded in an opening, 42 provided ing plate 65 and is adapted to move over an arcu ate gauge plate 14 which is secured to an arcu tending vertically disposed plate Y68 which is formed integral with the plate 36, The vertical clined inner sides 94 and 96 are disposed in con vergent relation towards the right as viewed in plate 6D constitutes a clamp support and extends laterally from the plate 36, as shown in Figure 1. Figure 2. in the plate 36 and the screw 4| is formed with 10 ate ñange 15 carried by the plate 66 atits outer or left end. The chain saw C is formed with a reduced inner end 43 engaging in an opening sprocket engaging lugs 16 which are adapted 44 formed in the central portion of the clamping collar 40. The screw 4| at the outer end thereof l to be disposed between the two plates 64 and 65 and the links 11 of the saw are adapted to rest is provided with a handle 45 so that when it is desired to rotatably adjust the plate or table 36 on 15 on the upper edges 61 and 68 of the clamping member 6|. The lugs 16 are locked between the the upper end of the shaft 34, the screw 4| may plates 64 and 65 by means of a pressure screw 18 be loosened and the desired adjustment made sovv which extends loosely through the front plate 64 as to angularly position the saw in the desired and is threaded into the rear` plate 65. The angular relation with respect to the abrading whee126. 20 screw 18 includes an angularly disposed handle 19 by means of which the screw 18 may be tight 'I'he carriage 33 is adapted to Ibe manually ened or loosened. - ' raised to an operative position for bringing the A selected tooth T of the chain saw is adapted teeth of the chain saw into engagement with the to be disposed in the proper position'for sharpen abrading wheel by means of a rock lever 46. The rock lever 46 is pivotally mounted on a pivot mem 25 ing by the wheel 26 by means of a slide struc ture 88 which is carried by the clamping member ber 41 carried by the lower portion of the frame 6|. The slide structure 88 includes a sliding member I6, and the shaft 34 has extending lat plate 8| disposed between the clamping members erally therefrom a pin 48 which is secured to the 64 and 65 and slidably engaging the upper edge shaft 34 by means of a bolt or cap screw 49. The pin 48 as shown in Figure 8 is formed with a 30 of the spacer member 66. The two plates 64 and 65 are provided with elongated openings 82 and sleeve 58 which slidably engages in an elongated 83, respectively, and the slide plate 8| is also slot 5| formed in the handle or lever 46 between formed with a vertical slot 84. A threaded shaft the ends thereof. The bushing, or guide 3| is also 85 is secured in outwardly or forwardly extended formed with a vertical slot 52 within which the pin 48 slidably engages so that the shaft or slide 35 position with respect to the forward plate 64, being supported on a pair of forwardly extending 34 will be held against rotation but will be per ears 86 which are struck from the forward plate mitted vertical sliding movement.l The shaft 34 64. A circular nut 81 is threaded on the relatively is limited in its upward movement by means of stationary shaft 85 and is adapted to engage in a reduced diameter downwardly extending threaded stud 53 which is carried by the lower 40 the slot 84 of the slide plate 8|. Movement of the nut 81 lengthwise of the shaft 85 will move end of the shaft 34, and an adjustable nut 54 is the slide plate 8| between the plates 64 and 65 threaded onto the stud 53~ A lock nut 55 is also and lengthwise of the clamping member 6|. threaded on the stud 53 and is adapted to lock The 'slide plate 8| has secured thereto a pair of the adjusting nut 54 in the desired position. A cotter pin 56 or the like is extended through a upwardly extending resilient fingers 88 and 89 which are secured at their lower ends to blocks the lower portion of the stud 53 so that the two 96 and 9|, respectively, by fastening members 92. nuts 54 and 55 cannot `be unthreaded from the The blocks 98 and 9| are secured on opposite sides stud 53 during normal use of the device. The of the slide member 8| and the resilient fingers 88 upper side of the plate 35 has secured thereto and 89 extend upwardly above the clamping mem an arcuate gauge plate 51 and a pointer 58 is in bers 64 and 65. The finger 88 has secured to the terposed between the Ibolt or cap screw 31'and upper end thereof and on the rear side a block 93 the upper side of the plate 36, there preferably which is formed with an inclined'inner face 94. being a washer 59 between the pointer 58 and The upper end of the rear resilient finger 89 has the plate 36 so that the pointer 58 will overlie the secured to the upper end thereof a block 95 gauge member 51. ` l formed with an inclined inner side 96 and the in The carriage 33 also includes an upwardly ex A clamping structure, generally designated as 6|, is pivotally secured on a, pivot member 62 which extends through a bushing or boss 63 carriedby the plate or support 68. The clamp structure 6| includes a pair of clamping plates 64 and 65 which 65 ‘ The blocks 93 and 95 are adapted to engage the opposite sides of the chain saw C so as to hold the saw against tilting and to coact with the clamp ing plates 64 and 65 in firmly holding the saw in a proper position for sharpening of a selected tooth. Y ‘ In the use and operation of this Sharpener, the frame I5 is secured to the desired support S and the motor 22 is connected to a suitable source of adjacent the lower portion thereof. The clamp~ air pressure supply so that the wheel 26 will be ing structure 6| is adapted to be vertically Vrocked on the pivot member 62 for adjusting the upper 70 rotated when the valve member 23 is moved to an open position. The chain saw C‘ is mounted on saw supporting edges 61 and 68 of the plates 64 the clamping member or structure 6| with the and 65 in order to provide for angularly grind are disposed in spaced relation, there being a spacer plate 66 between the plates 64 and 65> ing the teeth of the chain saw C which is clamped in the clamping member 6|. rl‘he clamp structure 6|4 is'locked lugs 16 engaging betweenthe plates 64 and 65 and the links 11 of the saw resting on the upper edges its angu 75 of the plates 64 and 65. The’opposite ends of the 5 2,410,828 plates 64 and 65 are preferably curved, as indi cated at 91, so that the chain saw can depend from the clamping structure 6l, as shown in Fig ure 1. 6 plates on said carriage, means holding said plates in adjusted position, a pair of opposed resilient saw gripping fingers, a slide secured ‘to said iin gers and movable lengthwise of said plates, and The carriage 33 is angularly adjusted about the means adjusting said slide lengthwise of said vertical aXis of the shaft 34 by loosening the plates, including cooperating screw and adjust clamping collar ¿lil after which the clamping seg able nut. ment 4l) may be tightened so as. to firmly hold the 2. A chain saw Sharpener comprising a frame, plate 36 against movement relative to the shaft a grinding wheel rotatably carried by said frame, 34. The clamping structure 6l may be vertically 10 a vertically shiftable carriage carried by said adjusted on the horizontal pivot 62 by loosening frame, a pair of saw clamping plates disposed in the nut 69 and swinging the clamping structure to a vertical position, means pivotally mounting said the desired position, as shown by the pointer 13 plates on said carriage, means holding said plates and the gauge 'F4'. l in adjusted position, a pair of opposed saw grip Before the clamping screw ‘i8 is tightened, the 15 ping fingers extending above said plates, and saw adjusting nut 81 is adjusted lengthwise of the means slidably mounting said fingers for adjust shaft 85 so that the proper tooth of the saW is in ment lengthwise of said plate. the proper position for grinding ofthe cutting 3. A chain saw Sharpener comprising a frame, edge thereof. When the saw has been adjusted a grinding wheel rotatably carried by said frame, lengthwise of the clamping vstructure 6|, the a vertically shiftable carriage carried by said clamping screw 18 may be tightened by the handle frame, a pair of saw clamping plates disposed in 'I9 so that the chain saw Will be held against a vertical position, means pivotally mounting said movement with respect to the clamping structure plates on said carriage, means holding said plates 6I. in adjusted position, a pair of opposed resilient The carriage shifting handle or lever 46 may 25 saw gripping fingers, a slide secured to said fin then be raised thereby bringing the selected tooth gers and movable lengthwise of said plates, and into engagement with the abrasive wheel 26. means adjusting said slide lengthwise of said plates. ~ The upward limit of movement of the carriage 33 is adjusted by adjusting the limit nut 5d which is 4. In a chain saw Sharpener, a movable car then locked by the lock nut 55. Having once 30 riage, a pair of saw clamping plates carried by made the proper adjustments of the carriage 33 said carriage, a pair of opposed saw gripping fin and the clamping structure 6I, the desired teeth of the saw can be ground, it being understood that the chain saw C includes right and left cutting teeth and a central raker tooth so that the angu lar adjustment of the carriage 33 and of the clamping structure 6| will be made for the cut gers disposed partially above said plates, said plates being formed with elongated guide slots, a slide loosely engaging in said slots, means secur ing said lingers to said slide for movement there with, means for simultaneously locking said slide and clamping said plates on opposite sides of the saw, and means for adjusting said slide length adjusted for the cutting teeth on the other side wise 0f said slots. and a further adjustment made for the raker 40 5. In a chain saw Sharpener as set forth in' teeth. claim 4 wherein said slide adjusting means in What I claim is: cludes a stationary threaded shaft carried by one 1. A chain saw Sharpener comprising a frame, of said plates, and a nut threaded on said shaft, a grinding wheel rotatably carried by said frame, said slide having an opening in which a portion a vertically shiftable carriage carried by said of said nut engages whereby movement of said frame, a pair of saw clamping plates disposed in a 45 nut lengthwise of said shaft will shift said slide. ting teeth on one side of the saw and may be re vertical position, means pivotally mounting said ANDERS R. LOFSTRAND, JR.