US2833166A - Chain saw grinder - Google Patents

Description

May 6, 1958 B. l. wlLsoN ETAL 2,833,166

` CHAIN SAW GRINDER Filed Sept.l 5, 1956 y 2 Sheets-Sheet l INVENTORS Bruce W//son W//fred A. S/'mdon May 6, 1958 l B. l. wlLsoN ETAL 2,833,166

l CHAIN sAw GRINDER Filed Sept. 5. 1956 A 2 Sheets-Sheet 2 .gill j@ INVENToRs 4 Bruce W/Yson Wilfred ALS/'mdon j vided therefor.

United States Patent O ice CHAIN SAW GRnsDER Bruce I. Wilson, Fort Atkinson, and Wilfred A. Simdon,

Cambridge, Ws. I

Application September 5, 1956, Serial No. 608,107 7 Claims. (Cl. 76-41) This invention relates to chain saw grinders.

It is an object of the'present invention to provide a chain saw grinder wherein the chain is held in a vise which can be advanced a definite amount into the path of the grinding wheel to remove stock and reservice teeth uniform to each other,` the device sharpening the chain back to factory tolerances without disassembling of the `chain teeth. v

Other objects of the invention are tov provide a chain saw grinder bearing the above objects inrnind which is of simple construction, has a minimum number of parts, is inexpensive to manufacture and efficient in operation.

For other objects and forja better understanding of the invention, referencemay, be had to.the following detailed description taken lin connection with the accom-V panying drawing, in which: j

Figure l is aV front'elevational view of a preferred embodiment of the present invention;

Fig. 2 is a top plan view` thereof showing the grinding motor removed;

Fig. 3 is an end elevational view looking from the light of Fig. 1;V

Fig. 4 is a fragmentary vertical sectional view taken along the line 4 4 of Fig. 1;

Fig. 5 is a vertical sectional view taken 5-5 of Fig. 2;

Fig. 6 is a vertical sectional view taken along the-line 6-6 of Fig. 2; and

Fig. 7 is a vertical sectional view taken along the line 7-7 of Fig. 2.A K

Referring nowmore in detail to the drawing, 10 indicates generally a body frame having a at rectangular lower portion 11 adapted to be mounted in a vise or the like, the upper portion being thickened laterally as at 12 and being provided with a vertically extending ways 13 of substantially trapezoidal shape and including the gib 14 and the gib adjusting screws 15.

The upper end of the frame is integrally formed with the shelf 16 at right angles thereto, the ends of the shelf extending beyond the vertical edges o f the frame. It will be noted (Fig. l) that the ways 13 extend upwardly to the upper surface of the shelf 16. y The shelf 16 is provided with the way 17 of trapezoidal shape (-Fig. 6)

along the line .y

which extends from end to end,I the gib 17 being pro- A rectangular plate 18 is integrally formed at its lower end with the laterally enlarged portion of trapezoidal shape 19 adaptedto slide/within the way 17, the upper edge of the plate 18 having the rectangular cutout 20 which defines the stationary jaw 21, Fig. 6. A movable jaw 22 is positioned Within the cutout 20 and is adapted for cooperative movement with the stationary jaw 21'by means of the lock screw 23 having the handle portion 24. Dowels 25 align the moveable jaw 22 laterally with the stationary jaw 21 while the springs 26 positioned within laterally aligned cylindrical openings on the inner faces of the jaws 21 and 22 at opposite ends serve to make thevvise self-opening when the lock screw 23 is released. s

As shown in Fig. 2, the jaw 21 at one end is integrally formed with the laterally extending, internally threaded member 27l within which is screwed the externally. tbreadf, ed portion 28 of ther feed mechanism indicated generally Y, at 29. s An- L-shaped bracket 30 is mounted onZ the undersurface of the shelf 16 at one end-thereof bymeans of the fastening means 31 and rotatably mounts the feed mechanism 29 against longitudinal displacement inter-j mediate the smooth cylindrical portion 32 thereof and,

the collar 33. The'feed mechanism 29 also includes the enlarged, externally knurled operating knob 34 and upon rotationV of the same, yit will Abe obvious that the-viserdesired amount ywithin, the, f

will move .longitudinally the way 17.

A supporting angle bracket '35 is integrally formedon its rear verticalface withthev trapezoidal shaped exten-I; sion slidable vertically within the way 13, thevertical position of the bracket being locked by the lock screwv 36 having the handle portion-37' (Fig; 3).

The vertical adjustment of the supporting ybracket35 is effected by the cam assembly indicated generallyat 37 and locked at the proper height for co-action by the lock screw 36, the cam assembly 37 including the cam lock' nut38 which allows` for' raising and lowering the cam.,

assembly 37 iu the frame 10 for making the grinderuniversal for all chains. i

The-bracket 35 rotatably mounts the semicircular end portion 39 of the rectangular plate 40 of the compound slide indicated generally at 41 by means of the countersunk rivet V42, the upper surface of the plate 40 outwardly of the rivet 42 being integrally formed withthe trapezoidal shaped extension 43. f 1

A carrier is provided and includes the base plate 44` formed on its undersurface with the way 45 having the gib 46 and Within which is slidably positioned the extension 43, to permit the necessary movement of the carrier,

the plate 44 beingrintegrally formed at the center thereof with the vertical mounting plate 47 having a longitu-Y dinally extending substantially semicircular opening 48. An electric motor grinder indicated generally at 49 is provided on its undersurface with the depending vertical plate Sli-integrally formed with the semicircular depending extension 51 which is pivotally mounted within the semicircular opening 4S byv means vof vthe pin 52 and' adapted for free movementtherewithin with one end 53 of the plate 50 resting on the upper surface of the plate 47 (Fig. 7). The plate 50 above the end- 53 is provided with the cutout- 54 which receives therewithin the externally knurled head 55 of the tilt adjustment screw 56'.

(Fig. 7). The other end of the plate 50 is vertically spaced above the upper surface'of the plate `47 and isl provided with the `cylindrical bore 57 which receives therewithin the upper end of the coil spring 58, the lowerof this construction, the electric motor grinder 19V-may.

betilted for grinding.

In "operation, the frame 10 holds or supports all other members and allows for verticaland horizontal adjustments. The cooperating vise jawst21 and 22`actuated 1by.the"sc`re`wx23 `will hold the chain 61 rigid-fand will allow for the precise horizontal adjustment of the same controlled by the feed mechanism 29. The bracket 35 allows for the vertical adjustment of the compound slide 41 controlled by the cam assembly 37 and locked Patented May 6, 195,8

the.

at the .proper height bythe 4loclt screw 36. The pivot 42 allows the proper angularadjustment which may be set at any number of degrees for the proper cooperative action of*tli`e grinding'wheel t'o'tlie teethof rthe chain L61. TheV carrier 44, 47 allows the :grinding wheel to be traver'sed vback andfoth'through thetooth of the chain 61.

The above grinder has' been` in operation for field te'stingland research work and hasbe'en tested for nearly a year and has `proved entirelyV satisfactory vin all respects. The tilt mechanism will permit the Sharpening of the chains inl-planesother than they horizontal and represents adecided advantage.4 The device willy permit the 'jointing rand grinding `ofthe depth `gauges by grinding them The `ch`ainfg6lis placed in the vise'withihe vcompound slide 41 set at vthe proper angl'e to 4the left or right depending jupon which'teethin lthe Achain we are grinding, link vriv'et ofthe tooth weare grindingiis placed over the lock screw andthe Avice is locked. With the motor rtinning and Vin position full -ahead to contact the tooth, the `tooth '-is advanced to the grinding wheel until there is 'a Eslight grin'ding vspark and -then advanced 0.003 'or 0L0O5 more or one-eighth of a turn of the feed wheel 34 with the grinding wheel out of the tooth and `the grinder V49 is run 'back and forth by hand a few strokes and we are ready to `proceed to the next tooth. If the chain has been handV le'd, and the angle *is ofi', which is usuallythe case, itis necessary to repeat the 0.003 to 0L005'in'ch advance once or twice more before moving to the next tooth. The aboveassurnes that the grinder, compound slide and support hav'clbeen properly 'elevated with the elevating cam assembly 37 so as to initially position the stone or grinding wheel 61 above the level of the cutting tooth.

The above chain grinder has been designed in conformed withaslateral `enlargementof substantially trapezoidal shape adapted to move within said way, and gib means at one side of said way.

2. A chain saw grinder according to claim 2, said means for adjusting the position of said vise means comprising said plate at one end having a lateral extension having an internally threaded bore, an L-shaped bracket secured to the end of said shelf, a feed mechanism including an externally threaded shank screw threaded through said extension, said feed mechanism including a cylindrical portion abutting the outer face of said bracket, a collar abutting the inner face of said bracket and secured to said externally threaded portion and an enlarged manually operable knob whereby upon rotation of said knob said vise means will move longitudinally of said shelf to the desired position.

` 3. A chain saw grinder according to claim 2, said means for mounting saidV support on said body frame` on the inner face thereof'being formed with an extension sidering the Vfact that all hand lechains `have to be ground considerably to get Ythem back to factory specifications, and this grinding can be done with ease with the present-invention. i f

l While various 'changes may be made in the detail construction, it shall be understood that such4 changes shall be within the spirit and scope of the present invention as defined bythe appended claims.` Y -v What we claim `as new Vand desire to protect by Letters Patent of the United States is: a

1. A chain saw grinder comprising `a body frame,l a

of substantially trapezoidal cross section slidable within said Way, means for locking said support comprising lock screw means.

4. A chain saw grinder according to claim 3, said means foradjusting the vertical position of said support comprising cam assembly means, said cam assembly means being adjustable within said body frame.

5. A chain saw grinder according to claim 4, said means for slidably mounting said'carrier on said plate comprising said plate on the upper surface thereof being integrally formed with a longitudinally extending trapezoidal cross section, said carrier including a base plate having a way on theundersurface thereof of trapezoidal cross section receiving said extension therewithin, gib means at one side of said way, said carrier including a vertical plate A.extending upwandly from said base plate at right angles thereto.

l6. A chain saw grinder according to claim 5, said means for mounting said electric grinder Aon said carrier comprising said vertical plate having an elongated opening horizontal shelf at fth'e upper end of said frame, vise means y adapted to grip the chain therewithin, means slidably mounting said vise means on said shelf, means for adjusting said vise means on said shelf, a support, means slidably mounting said support upon said frame for vertical movement, means for adjusting the position of said support, means for locking the support at the adjusted position, an elongated plate pivotally mounted upon said suppo'rtand extending outwardly from said vise, a carrier, means `slidably mounting said carrier on said plate for longitudinal movement thereon, an electric grinder, and means for mounting said electric grinder on said carrier for adjustment about a horizontal axis, said vise means comprising a vertical plate'having a cutout along the upper edge at one side and defining a stationary jaw, removable jaw positioned within said cutout and adapted for cooperative action with said stationary jaw, means for drawing said stationary and movable jaws together, spring meansrfor urging said jaws apart, dowel means for aligning said stationary and movable jaws laterally with each other during movement, and said means for slidably mounting said vise means on said shelf comprising said shelf having a trapezoidally shaped way extendingY from end to end, said plate at the lower end being integrally of substantially sernicircular shape, a depending plate secured `to the bottom of said electric grinder, said depending plate at the center thereof being integrally formed with a depending sernicircular portion pivotally mounted within said sernicircular opening and adapted for rotational movement therewithin, one end of said depending p 'late resting on the upper surface of said vertical carrier plate and having a cutout portion thereabove, a tilt screw having an enlarged head within said cutout and screw threaded downwardly through said plate and carrier, the other end of said depending plate being vertically spaced from the upper surface of said vertical carrier plate, said depending plate and 4carrier plate having vertically aligned openings, and a coil spring positioned within said vertically aligned openings. a

, 7. A chain saw grinder according to claim 6, including cooperating indicia on said depending plate and carrier to indicate when the grinder is in a horizontal position,

and cooperating indicia carried by said support and the end of said plate pivotally mounted thereon whereby to indicate the angulation of the grinder.

vReferences Cited in the file of this patent UNITED STATES PATENTS 2,568,062 Fitch., i.-- Sept. 18, 1951 2,704,948 `Le 4Grand Mar. 29, 1955

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