US1903369A - Sickle grinder - Google Patents

Description

April 1933. .1. BROWN ET AL 1,903,369

S ICKLE GRINDER Original Filed Deb. 31, 1950 gwoe'ntoz Patented Apr. 4, 1933 UNITED STATES .mcx BROWN AND WILLIAM F. nnu'rnn, on o'ron; NEBRASKA SICKLE GRINDER Application filed December 31, 1930, Serial No. 505,785, Renewed August 31 1332. 4

This invention relates to sickle grinders and its object is to provide a sickle grinderhaving a stable support and having means for moving the sickle holding member laterally or toward and away from the grinder.

Another object of the invention is the provision of a hand operated platform for holding the sickle, the platform being slidable to bring various parts of the sickle into 1 contact with the grinder and being also pivotally movable toward 'or away 'from the grinder, there being also provided rests for holding the platform in position away from the grinder. V V

Another object is the provision of a sickle platform which is pivotally connected to a handle with linkage 'for moving the sickle platform toward and away from the grinder when the handle is raised or lowered.

Having in view these objects and others which will be pointed out in the following description, we will now refer to the drawing, in which 1 Figure 1 is a view in perspective of the sickle grinder showing the sickle holding members in their rest position with the sickle away from the grinder;

Figure 2' is a view in side elevation of a fragment of the sickle grinder with the parts in the position shown in Figure 1.

Figure 3 is a view in side elevation of the sickle grinder with the parts in intermediate position between the operative grinding po- 5 sition and the rest position.

The frameincludes rear legs and front legs .11 and 12 arranged in inverted V-shaped pairs having bearings 13 at their upper ends.'

The frame is braced by means of two transverse braces 14, a pair of crossed braces 15 and an additional brace 16. The bearings 13 receive the shaft 17 which is provided with a grinder 18 and with a driving pulley The rod 20 is secured at one of its extremities to'the leg 11 as shown in Figure 1. This rod 20 extends across the front ofthe frame and to a considerable distance beyond the opposite end of the frame. It is provided with a pair of braces 21 extending to two rigid support for the free end of the rod 20. Two collars 22 surround the rod 20 and they are freely slidableon the rod. One of the collars has secured thereto a rod 23 while the other collar has aisimilar rod 24 which terminates in a handle portion." J ournalled to the rods 23'and 24 is atransverserod or tube 25.

The bent rod or tube 26 is pivotally sei cured'at the junction of the rods 23 and 25 and it extends first upwardly and rearwardly and then upwardly. The opposite end portion of the rod or tube 25 is bent toprovide an arm 27 which projects upwardly and rearwardly. The rod or tube 28 is secured, preferably by welding, to the arms 26 :and27.

The free end portion of the .bent rodi26 is formed into a clamp, thatportioncooperating with a clamping member 291 having a 28 is further provided with an intermediate clamping member as shown in Figure 1, the purpose ,of this construction beingkmore fully described in the description of the mode of operation of the sickle-grinder. The

of the legs, the purpose being to provide a sickle 81 may be clamped in all three clamps V as shown in Figure l or it may be clamped to the intermediate clamp and to one of the end clamps, 4 5' The grinder further includes a number of stops. The stops which function to maintain the parts in the rest position include the stop 32 projecting upwardly and forwardly from theyleg 12 and engaging they;

rod ortube 2 5 and the stop 33'projecting upwardly from the handle member 24 for engaging the rod or tube 28/ The handle 24 is also provided with a stop member 3 1 for engaging the rod or "tube '28 during the movement of the sickle holding platform into its operative position. a

From the foregoing description it is believed that the operation of the sickle grinder will be obvious. The inoperative position or the position at rest is shown in Figures 1 and 2.. When the parts are in this position the tube 25 rests on the stop member 32 and the pipe or rod 28 rests on the stop member 33. When it is desired to move the parts to operative position the operator merely grasps the handle 24 and lifts its free end.

7 The movement following the lifting of the handle is a compound movement depending on the upper extremitv'of the stop member P 34. While this movement is mainly the result of the action of the spring together with the thrust from the parts 26 and 27, the shifting center of mass of the sickle carrying frame also affects the movement whereby the transverse portion 28 is seated on the stop 7 member 34. As soon as the stop member 34 engages the member 28, continued upward movement of the free end of the lever 24 has the effect of positively forcing the sickle carrying frame forward toward the grinder.

1 During the grinding of the sickle the operator maintains his grasp on the handle 24 in order to control the pressure of thesickle against the grinder. The stop member 34 acts positively so that considerable pressure is possiblethrough the leverage of the lever 24. When this pressure is too great for the best results the operator merely applies less leverage to thehandle and the spring 35 then makes. the regulation of the pressure extremely sensitive so that it is possible to maintain even the very slightest pressure of the sickle against the grinder. The spring 35 has the further advantage in acting as a bufferv to counteract the vibration which might otherwise grind the sickles very unevenly. By maintaining only a slight pressure of the sickles on the grinder, the spring .35 ispermitted to compensate for the vibrations in pressure due to the vibrations of the machine. At the same time the stop 34 will prevent the sickle holding frame from jumping entirely away from the sickle as the result of possible severe vibrations.

The sliding collars 22 make it possible to move-the sickle 31 to bring consecutive teeth intocontact with the grinder 18. The three clamps prevent vibration inthe sickle itself This thrust is whereas two clamps alone have been found to cause excessive vibration in the sickle itself. The primary purpose of the three clamps, however, is to make it possible to bring the end teeth of the sickle into contact with the grinder and at the same time to provide at least two clamps .for holding the sickle. The shifting of the sickle laterally is accomplished through the lever'24.

While we have described our lnvention in great detail, it is obvious that numerous changes may be made without departing from the spirit of our invention. We there fore reserve to ourselves therights to all Y improvements and variations falling within the scope of the appended claims.

Having thus described our. invention in such full, clear, and exact terms that its construction and operation will be readily understood by others skilled in the art to which it pertains, what we claim as new and desire to secure by Letters Patent of the. United States is: l a

1. In a sickle grinder, a main frame 11wing a grinder shaft journalledthereon, a sup ort on said main frame positioned in parallelism with said grinder shaft, a frame pivotally and slidably secured to said support, a sickle carrying frame pivotally connected to said pivoted frame, said sickle carrying frame being provided with clamps forsecuring a sickle thereto, a handle projecting from said pivoted frame, stops on said main frame and on said handle for maintaining said sickle carryingframe in inoperative position, and an additional stop on said handle for engaging said sickle carrying frame when raising said handle to operatively position said sickle carrying frame. i c

V 2.. In a sickle grinder, ajmain frame-having a grinder shaft journalled thereon, a support on said main frame positioned in parallelism with saidgri-nder shaft, a frame pivotally and slidably secured to said support, a sickle carrying frame pivotally connected to said pivoted frame, said sickle carrying frame being provided with clamps for securing a sickle thereto, a handle projectingfrom ioo said pivoted frame, a pair of spaced stops P on said handle for engaging said sickle car- 1 rying frame,fone of said stops being adapted to support said sickle carrying frame in its inoperative position and the other of said stops being-adapted to engage said sickle carrying said handle. p

3. In a sickle grinder, a main frame hav ing a grinder shaft journalled thereon, a supframeduring the'lifting movement of port on said main frame positioned in paral:

lelism with said grinder shaft, a frame pivotally and slidably secured to said support, a sickle carrying frame pivotally connected to said pivoted frame, said sickle carrying frame being provided withclamps for securing a sickle thereto, a handle projecting from said pivoted frame, and a pair of spaced and to said handle for facilitating the move ment of said sickle carrying frame from either of said stops to the other of saidstops.

In testimony whereof we afl'ix our signatures.

JACK BROWN. WILLIAM F. REUTER.

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