US2718733A - Sickle grinder - Google Patents

Description

JNENTOR.

2 Sheets-Sheet 1 iM ||..l... l l

OO OO C. STADICK SICKLE GRINDER :EEE-222::ti

sept. A27, 1955 Filed Jan. 14, 1953vv NWMW Sept. 27, 1955 F'led Jan. 14, 1953 C. STADICK SICKLE GRINDER 2 Sheets-Sheet 2 INV NroR. @2/Wd ma? BY UnitedV StatCS Patent j My invention relates to sickle grinders, and has for its primary object the provision of a novel mechanism for the sharpening of -generally triangular cutting blades of a sickle without removing samefrom the -sickle bar.

A still further object of my invention is the provision of a device of the class described which is provided with a power driven grinding wheel which is so mounted as to enable the operator to quickly and easily adjust the position of same so as to obtain any desired angulation or position of the cutting faces thereof.

A still further object of my invention is the provision of a novel means for suspending or mounting the sickle bar, including yielding means, whereby any desiredl position of the cutting blades,'with respectto the grinding wheel, may be quickly and easily arrived at.

A still further object of my invention is the provision of a device of the class described which is inexpensive and simple in construction, yet durable in use.

A, still further objectv of my invention is the provision of a device of the class described which is extremely easy to operate, yet is highly efficient in use.

The above and still further objects of my invention will become apparent from the following detailed specification, appended claim, and attached drawings.

Referring to the drawings, wherein like characters indicate like parts throughout the several views:

Fig. 1 is a view in plan of my novel structure, one position of the parts thereof being shown by dotted lines;

Fig. 2 is a view in front elevation of the structure of Fig. l; and

Fig. 3 is a View partly in end elevation and partly in vertical section, as seen from the line 3-3 of Fig. 2.

Referring with greater particularity to the drawings, the numeral 1 indicates a horizontally-disposed generally rectangular frame made up of angular, parallel, front and rear members 2 and 3, respectively, and joining end members 4 and 5. Preferably and as shown, the frame 1 is supported from the floor by means of legs 6 at each corner. The upstanding sides 7 of the angular front and rear members 2 and 3, respectively, define an elongated guideway in the nature of rails. Carriage 8, preferably and as shown in the nature of a rectangular plate, has laterally-spaced pairs of trunnions 9 projecting outwardly from opposite sides. Iournalled for rotation on the trunnions 9 are rollers 10 having concave peripheral surfaces 11 adapted to receive the upstanding rail-acting sides 7 of the frame members 2 and 3 therein. In this manner, the carriage 8 is mounted for longitudinal sliding movements with respect to the frame 1. In order to manually impart reciprocal movements to the carriage 8 along the tracks 7, I provide a conventional chain 12 secured at its opposite ends to frame members 4 and S, respectively, and positioned therebeneath. Depending from the carriage 8 are a pair of laterally-spaced bearing legs 13, through which passes for rotation a shaft 14 having a handle 15 at its forward end, and a sprocket 16 at its rear end. As shown, sprocket 16 has meshing enl 2,718,733 Patented Sept. 27, 1955 gagementwith :the `chain 12.` End thrust of the shaft` 14, with respect to the bearing legs 13, is vprevented by screw-equipped collars 17. l It should be obvious that rotation of the crank-acting handle 15 causes the sprocket 16, totravel yon the .chain y12, and `to simultaneously move the carriagel 8` longitudinally` of the frame 1, the rollers 10 rolling upon the rail-acting sides 7 of the frame mem- .A base plate 18 overlies thecarriage 8 and `is connected thereto for' swinging movements in the plane thereof through themedium of `a strap 19, which projects forwardly and has its free end 20 pivotally secured thereto through the mediumrof a nut-equipped bolt 21. Rigidly securedl by welding or` 4the like tothe base plate 18 and projecting `upwardly therefrom-,are a pair of laterallyspaced posts22, through the upper ends of which projects ashaft 23. vMounted at their upper ends for swinging movements about the shaft 23 are a pair of laterallyspaced supporting legs 24. At the lower ends, the supporting legs'24,-arev angularly out-turned to provide sup-l porting feet25.to which, by means of threaded bolts or the ;like264 is secured a motor-mounting plate or member `27. An electric motor 28 is secured to the motor mounting plate 27 by means of threaded bolts or the` like 29. Forlthe purpose of positioning the motor mount'- i bymeans of -a nut 34 or the `like,`is an abrasive or grinding wheel .-35, preferablyand as shown'having a beveled peripheral grinding face 36 thereon. It will be noted that the drive shaft 33 of the motor 28 is disposed at an oblique angle with respect to the shaft 23 upon which the legs 24 are pivotally mounted, and that the axis of the grinding wheel 35 intersects the axis of said shaft 23. It will also be observed that the axis of the pivot bolt 21 is substantially tangent to the peripheral surface 36 of the grinding wheel 35.

Projecting rearwardly from the frame member 3, one each adjacent opposite ends thereof, are a pair of lugs 37 to which are rigidly secured a pair of standards 38. A pair of horizontally-disposed supporting arms 39 have their rearward ends slidably adjustably secured within heads 40, as indicated at 41. Heads 40 are slidably adjustably secured to the upper ends of the standards 38, as indicated at 42. This arrangement makes possible horizontal and vertical adjustments of the arms 39 with respect to the standards 38. The free ends of the arms 39 terminate adjacent the vertical plane of the front edge of the frame 1, preferably and as shown in forwardly spaced relation thereto. A pair of coil springs 43 are connected one each at their upper ends to the free ends of the arms 39, as indicated at 44. At their lower ends, the springs 43 have hooked engagement with the upper ends of sickle bar clamping members, identified in their entirety by the numeral 45, and each including a vertically-disposed rod 46. Rods 46 are, as shown, bent backwardly upon themselves at their lower ends, as indicated at 47, to nestingly receive the rear end portion of a sickle bar 48. Slidably adjustably mounted on the upper end portions of the rods 46 are clamping fingers 49, which are notched, as at 50, to receive the forward end portions of conventional triangular-shaped cutting knives 51, customarily secured to the sickle bar 48 in side by side relation by means of rivets or the like 52. The thumb screws for releasably locking the ngers 49 to the rods 46 are identified by the numeral 53.

By the above described arrangement, it should be obvious that the peripheral grinding face 36 of the grinding wheel 35 may be moved to any desired operative position'without changing the distance therebetween andl the axis of the pivot bolt. rlhis is extremely important because different angular positions of the grinding face 36 are necessary-for theeffective'and' eiiicieit sharpening of the angular faces of thecutting knives 51.' "Further more, it shouldbe'ob'vious thatbecauselof the yielding connection between the c ilamping members '45: and arms, 39, that the maximum degree'ofuniversalj' y A ment by the cutter barV at the 'grindingvs'fljieelv is achieved, Obviously, a still further benefit 'of this yielding'connection is that the operator is relieved of the necessity'of' carrying the weight ofl the sickle bar` when'sha'rpenig the knives thereof, a'nd needs only to guide and'diect In operation,` the operator'attachesr'the sickle bar"4'8 in the elamping members 4S with the 'u'tting knives 51 positioned upwardly, as shown in Fig. 21 rlfhe carriages is then positioned adjacent one endof'the sickle ba""48 by manipulation of the crank'handl'e 15. The sickle/bar; under the yielding tension of the springs 43 may be readily'l tilted in opposite directions by raising'and lowering either end, whereby to obtain proper and desired engagement of the converging knife-acting side edges of theV cutting knives 5'1'with the peripheral sur-face 36 ofthe' grinding wheel 35. The carriage' 8 and grinding wheel '35 mountedA thereon are advanced from'tooth to tooth as desired; libwever, during the sharpening of the side edges of afgiven blade, or alternately during the sharpening of the diveijging edges of adjacent blades, the carriage 8 and grinding wheel 35 remain'fixed on 'the tracks 7. Y

My invention has been thoroughly tested and found to be completely satisfactory for y"the accomplishment of the above objects, and while I have shown a commercial embodiment of my invention, it should 'be obvious' that same 11S capable of modification without departure from e A grinder for sickle bars including a horizontally disposed frame defining an elongated guideway, a carriage mounted for sliding movements on said guideway, means for imparting reciprocal movements to said carriage on said guideway, a power operated grinding wheel on said carriage, a pair of laterally spaced standards secured to said frame and projecting upwardly adjacent the rear side of said guideway, a pair. f generally horizontally disposed supporting arms one each secured to one of said standards and having their lfree ends terminating in a vertical plane forwardly. of the front edge of said frame, a pair of vertically disposed, laterally spaced sickle bar clamping members, andl coil springs connecting the upper end portions of said clamping members one each to the free ends of said supporting arms, said clamping members including vertically disposed rods, said rods being bent backwardly upon themselves at their lower ends to nestingly receive the rear end portion of said sickle bar, and slidably adjustable vclamping fingers en said vertically disp'esedfrods, said clamping'iing'ers being providedwith notches to receive the Yorwar'd end portions of the cutting knives carriei'byl said sickle bar;v

References Criteri inthe iile of this patent um@ STATES PATENTS

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