US2691251A - Sickle grinder - Google Patents

Description

O. P. REHSE SVICKLE GRINDER Oct. l2, 1954 Filed Jan. 11, 1952 2 Sheets-Sheet 1 Q U Q QwNm om. mm am mw mm Ix No mi QQ vwl v\ s Wm, QQ Q ww NQ Nv .ov Q mn mv b E. wm f L v\ mv h 70m Q` Il om QQ Q /YS wQm Q ma Q Otro R Rehse INVENTOR.

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Oct. l2, 1954 Filed Jan. l1, 1952 O. P. REHSE SICKLE GRINDER 2 Sheets-Sheet 2 Otto R Rehse INVENTOR.

Patented 0st. 12, 1954 ITED STATES A'rsNr OFFICE 2 Claims. l

This invention relates generally to grinders, and more specifically to a swing grinder for sickle blades.

The primary object of this invention is to provide a swing grinder for sickle blades in which the grinding wheel may be reciprocated transversely of the sickle blade in a horizontal plane.

Another object of this invention is to provide a swing grinder for sickle blades having support means for the sickle blade to which the sickle blade may be quickly clamped.

Another object of this invention is to provide a swing grinder for sickle blades having a support for the sickle blade which needs no adjustment other than the clamping of the blade in place.

Another object of this invention is to provide a swing grinder in which the grinding wheel and its drive means are mounted on a support frame in counter-balanced relation.

Another object of this invention is to provide a swing grinder which is a compact unit and of simple construction whereby it may be economically manufactured.

A further object of this invention is to provide a swing grinder for sickle blades which is simple and easy to operate through numerous diierent angles with a minimum of fatigue for the operator.

With these objects definitely in view, this invention resides in certain novel features of construction, in combination and arrangement of elements and portions as will be hereinafter described in detail in the speciiication, particularly pointed out in the appended claims, and illustrated in the accompanying drawings which form I a material part of this application, and in which:

Figure 1 is a top plan View of the swing grinder which is the subject of this invention;

Figure 2 is a partial front elevational view of the swing grinder 4of Figure 1, the legs of the support having their lower ends cut off;

Figure 3 is an end elevational view of the swing grinder of Figure 1 and shows in dotted lines a second position of the grinding wheel and its associated means; and

Figure 4 is an enlarged partial transverse vertical sectional view of the swing grinder and shows in more detail the grinding wheel and its associated support means, the grinding wheel being shown in its grinding position by dotted A lines.

Similar characters of reference designate similar or identical elements and portions throughout the specication and throughout the different views of the drawings.

Referring now to the drawings in detail, this invention includes a support iii, a track way structure I2 and a grinding wheel supporting means I4. Referring now to Figures 1 and 2 in particular, it will be seen that the support Ill includes rectilinearly spaced legs i6 having the shape of an A-frame. The legs i6 are arranged in pairs at each end of the support I0, and the cross arms I8 extending between and secured to the apex of each pair oi legs. Secured to the upper surface of the cross arms I8 in spaced parallel relation are a pair of longitudinally extending frame members 2li which lie in a horizontal plane. Extending between and secured to the ends of the longitudinally extending frame members 2li are end cross frame members 22. An intermediate cross frame member 24 extend between and is secured to the longitudinally extending frame members 2li intermediate their ends. The cross frame members 22 and 24 are preferably tubular and circular in cross section, and are secured to the longitudinally extending frame rails 20 by bolts 2S which pass through the longitudinally extending frame members and the cross frame members. The longitudinally extending frame members are preferably angle shaped in cross section and have horizontal and vertical flanges. Mounted on the upper end of the vertical flange of one of the longitudinally extending frame rails 2@ is a longitudinally extending sickle blade support 28 in the form of an angle bar having flanges of equal width, and the flanges lying at a 45 angle to the horizontal, the apex being secured to the vertical flange of the longitudinally extending frame member 2t. A sickle bar 3B may be clamped to the support 28 in a horizontal plane by a conventional C- clamp 32 having an adjusting screw 34.

The track way I2 is mounted on the end cross frame members 22 for sliding movement longitudinally thereof and in transverse relation to the support I0. The track way I2 includes a pair of vertical standards 36, which are rigidly secured to the sleeves 38 by welding or other equivalent fastening means. The sleeves 38 are mounted over the circular cross sectional end cross frame members 22 for sliding motion longitudinally thereof. The sleeves 38 are locked against relative motion with respect to the end cross frame members 22 by locked screws 130. Braces 42 are provided between the sleeves 38 and the vertical standards 3G. At the upper ends of the standards 3S are track receiving brackets 44 having an axis perpendicular to the center line of the standards 36 parallel to the longitul.) dinally extending frame rails 20. A longitudinally extending circular cross sectional rail 46 eX- tends between and is secured to the brackets Mi by lock screws 48. In view of the foregoing, it is readily apparent that by releasing the lock screws 40, that the track may be shifted toward or away from the sickle bar 3%) in its clamped position, and at the same time remaining parallel thereto.

Carried by the track it for movement longitudinally thereof is the grinding wheel structure I4. The grinding wheel structure i4 includes a carrier and a grinding wheel supporting frame. The carrier consists of a plate 58 which has mounted on one side thereof a pair of spaced rollers 52. The rollers 52 are rotatably mounted on bolts 5t secured to the plate 5t. Secured to the plate 5l) in overlapping relation is an arm 56. The arm 56 is carried at the lower end of the plate 5d and extends downwardly therefrom in a vertical plane. The arm 5E has integral with its upper end a longitudinally extending flange 58 which is normal to the plane of the plate 50. Carried by the longitudinally extending flange 58-is a longitudinally extending guide 60 which has a U-shaped cross section and opens outwardly. Referring to Figure l in particular, it will be seen that the U-shaped guide 8G in cooperation with the rollers 52 form a pair of spaced substantially circular journals whereby the plate 5e and its associated arm 5G may be.

pivoted about the rail lit. Secured to the lower end of the arm 56 is a bracket 62 having a longitudinally extending body portion Sil, a vertically extending flange 6G secured to the arm 58 by bolt means 63, and a pair of downwardly ei:- tending spaced anges it. The aforesaid grinding wheel supporting frame is pivotally mounted between the downwardly extending flanges lll.

Referring now to Figure 1, it will be seen that the grinding wheels supporting frame includes a pair of transversely extending side rails l2 and a plurality of cross frame members in the form of supports. The cross frame members include a pair of spaced bars 89 extending between the side rails 'l2 and secured thereto adjacent vone end. The supportbars 88 carry an electric motor 18 which is secured thereto by a plurality of bolts 16. Extending between and secured to the other end of the side rails 'i2 is a handle irl. handle 'ill is preferably tubular and secured to the side rails l2 by a bolt extending through the side rails 'i2 and the handle The bolt being generally designated by the numeral S2. Rotatably journaled on the side rails 'l2 adjacent the handle 'lll is a shaft Si! on whichis mounted a grinding wheel 86. When the grinder is used to sharpen a sickle bar, the grinding wheel SS is of the conventional double bevel type. Carried by the side rails 'i2 adjacent the grinding wheel S6 and away from the handle 'ld is a guard 83. The guard S8 is pivotally mounted between the side rails l2 by a bolt Bil, and overlies the grinding wheel 86. The grinder wheel supporting frame is pivotally secured to the brackets 62 by bolts 92 passing through the downwardly directed flanges 'IG of the bracket and the side rails 72 of the supporting frame.

The grinder wheel B6 is mounted on the shaft 84 in centered relation by the use-of spacers 94. Mounted on one end of the shaft 84 externally of the side rails 'I2 is a driven vpulley 96. Mounted on the shaft 98 of the electric motor it is a drive pulley l which is connected to the driven pulley 96 by a drive belt 132. The electric motor The i 18 is connected to any convenient power source by the wire m3. As is clearly shown in Figure l, the cutting edges it of the sickle bar 3B are at an angle to each other to form a triangular opening therebetween. It is readily apparent that when the grinder wheel 8S is brought into engagement with the cutting edges lllfi and moved transversely of the sickle bar, the two intersecting cutting edges are sharpened at the same time.

Referring now more speciiically to Figure 4, it will be seen that since the carrier is pivotally mounted on the track 46 and the grinder wheel supporting frame is pivotally carried by the carrier, that the grinder wheel 86 may easily follow the cutting edge Ill of the sickle bar 30 even if the sickle bar deviates slightly from the horizontal. Due to the ability of the grinding wheel to be moved along any desired line transversely of the support lll, the sickle bar 35i may be quickly clamped to the sickle bar support 28 by the C-clamp 32 without requiring complicated adjustments. However, in order that the sickle bar 3S, may be clamped in the same position each time it is ground, the sickle bar support 28 is provided on its upper surface adjacent its right vhand end, as viewed in Figures 1 and 2, with an angle shaped stop member HB5.

In view of the foregoing, it is readily apparent that the swing grinder which is the subject in this invention, is for metal stock such as a pipe, angle bars, nat stock, etc., which may be readily attained. Furthermore, the construction of this swing grinder is extremely simple and may be formed in any metal working shop. Also, due to the counter-balanced supporting of the grinder wheel supporting frame, the grinder may be used with very little effort on the part of the operator.

Although the grinder has been illustrated and described as being supported by the legs I6 and the cross arms i8, it is not intended to so limit the invention as the grinder may be equally as well supported by other means.

The operation of this machine will be understood from the foregoing description of the mechanical details, thereof, taken in combination with the above mentioned objects and the drawings. Further description would appear to be unnecessary.

Minor modification of the machine, varying in minor details from the embodiment of the machine illustrated and described here, may be resorted to Without departure from the spirit and scope of the invention, as defined inthe appended claims.

Having described the invention, what isv claimed as new is:

l. A swing grinder comprising a support, spaced standards mounted onvsaid support, a ti'ackextending between and secured to the upper ends of said standards, a grinding wheel, grinding wheel `mounting meanszmounted on said track for sliding longitudinally thereof, said mounting means including pivot means whereby said grinding wheel may be reciprocated transversely of said track in a horizontal plane, said standards being movable transversely ol' said support.

2. A swing grinder comprising a support, spaced standards mounted on said support, a track'extending between and secured to the upper ends of said standards, a grinding wheel, grinding wheel .mounting means mountedon said 'track for sliding longitudinally thereof, said'mounting means including pivot means whereby said grinding wheel may be reciprocated transversely of said track in a horizontal plane, said standards being movable transversely of said support, a sickle bar support carried by said support in parallel relation to said track, clamp means carried by said sickle 'par support for clamping a sickle bar on said sickle bar support in a horizontal plane, said sickle bar support forming a portion of a support for said standards.

References Cited in the le of this patent UNITED STATES PATENTS Number Number 6 Name Date Klay Sept. 6, 1921 Bole Jan. 16, 1923 Carpenter Jan. 3, 1939 Utterback Jan. 16, 1940 Greeley Dec. 21, 1948 Rainbolt et al Sept. 27, 1949 Coffeen Oct. 25, 1949 Rickman July 31, 1951 Webber Jan. 29, 1952

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