US2009339A - Sickle bar for mowing machines - Google Patents

Description

July 23, 1935. J. J. DAVIS SICKLE BAR FOR MOWING MACHINES Filed Sept. 29, 1933 2 Sheets-Sheet l Inventor f f (pay/11' Attorney July 23, 1935. DAVIS 2,009,339

SICKLE BAR FOR MOWING MACHINES Filed Sept. 29, 1935 2 Sheets-Sheet 2 7/ I nvenflor cJTc/T Jay/1:

29- I QMM O'A Patented July 23, 1935 UNITED STATES I PATENT OFFIGE 2,009,339 sioKLE BAR FonMowiNc moraines Joseph JamcsDavis, Bethel, v Application September 29, 1933, Serial No. 691,547 I lClaim. (01.56 300) This invention relates to an improved reciprocatory cutter or sickle barsuch as is used in present day mowing and equivalent reaping and cutting machines.

Stated more explicitly the invented conception comprehends the provision of a scientifically correct properly balanced multiple tooth assemblage wherein the abutting teeth are detachably mount- 1 ed on the supporting bar by efficient .quick .de-

tachable means of a type and style calculated to permit selective removal, replacement and sharpening of damaged teeth.

Needless to say I am aware of the fact that l itgis not broadly new in this particular line ofv endeavor to detachably connect the cutter plates or teeth with the backing and supporting bar in amanner to expedite renewal and sharpening. Therefore, it is my principal aim to generally improve upon known patented and marketed-ai rangement through the-adoption and use of a more systematic assemblage whose features-of accommodation and adaptation transcend those of similar arrangements.

In carrying the principles of the present inventive idea into actual practice measures are taken to provide a more satisfactory; simplified and dependable construction devoid of superfluous details and characterized by requisite E, strength and" durability in order to better iulfi'll the requirement of a construction of this class.

By way of introduction it is to be pointed out that in the aforesaid prior art devices acknowledged to be old it is generally necessary to resort to revision and changes in the fundamental details of the conventional style cutterbar. By way of contrast the improvement constituting the novelty of this invention provides an arrangement Whose parts are aptly fitted to serve on the marketed type apertured cutter bar without requiring alterations in the stock parts, this being a logical and impressive refinement destined to be recognized as one of the principal improvements of the invention.

Other features and advantages will become more readily apparent from the following description and drawings.

In the drawings:-

Figure l is an elevational view of a structure developed in accordance with the principles and fundamentals of the present invention,

Figures 2, 3 and 4 are transverse sectional views taken on the planes of the lines 2-2, 3-3 and.

4-4, respectively of Figure 1.

Figure 5 is an elevational View of one species or variety of tooth or plate used in the improved assemblage. I A 5 Figures 6 and 7 are elevational views of other complemental and companion types of plates. Figures- 8 and-9 are detail elevational views of the especially fashioned retaining rivet used in perfecting the invention. K

Referring now to Figure l, I call attention to that part designated as aconventiona-l castingor unit' which comprises the usuai'type plate-like casting it having a ball joint-connector H for-med integral therewith to accommodate thepitmah (not shown) or other actuating means commonly used in this type of machine. This: casting also includes an extension 12 disposed in spaced parallelism with the adjacent end portion of the main supporting bar 1-3 for the various cutterplates or teeth. At the left hand end this bar 13 is riveted or otherwise secured to the main casting 10. As shown in Figure 8 specialcon necting pins or rivets are provided here, the rivets being formed with a flattenedhemispherical-head M on the side adjacent the-bar i3 and a frustroconical head 15 on the casting side. The shank portion is enlarged as indicated at 46 to form a shoulder which bears against the bar I3 and which portion also serves as an anchor for the coordinated or complemental cutter plate. Incidentally the term plate and the term-teeth" are used in an equivalent sense to indicate-the plate-like cutting elements. As-a matter of distinction between the three different sets of plates I desire to differentiate them as follows. There are two companion plates I! at the left in Figure 1 located between the parts I0 and I3. At the extreme right hand end there is what may be designated as a master or key plate 18 and the ones between these plates I! and i8 constitute the regular or standardized ones which are differentiated by the numerals l9. All of the plates 19 are of the same construction and the description of one will suffice for all. Considering first the plate I"! shown in Figure 5 it will be seen that it is of customary configuration so far as shape is concerned but provided in one side edge portion with a keeper notch 20 and in the rear edge portion with an L-shaped slot which may be described as a bayonet slot, the same including an entrance portion 2i and a seating branch 22 for cooperation with the portion l6 of the rivet. The terminal or end plate l8 shown in Figure '7 is the same in general outline but provided in one sideedge with a keeper and guide notch 23 and in the opposite edge portion with a bolt hole 24. This is adapted to accommodate a bolt or permanent rivet 25 as shown in Figure 1 which must be removed to permit this plate [8 to be taken off and to allow the remaining plates l9 and H to be selectively removed or replaced as conditions require.

All of the plates I9 are'the same in construction as shown in Figure 6, each plate is formed in the left hand side edge portion with a notch 26 opposite to which is a key-hole slot 21 and a clearance and assembling niche 28. It is to be pointed out that the rivet used to hold the plate I9 in place is somewhat similar to the one used to hold the plate il in position. One of these rivets is shown in Figure 9 and comprises a cylindrical shank 29 having a frustro-conical head 30 and an enlarged shoulder forming portion 3|. The shoulder 3i bears against the attaching bar l3 as shown in Figure 4. and the shank 29 has its terminal portion shaped into a retaining head 32. The conical head 38 serves to hold the plate in position, said plate being supported on the shoulder part 3! between said head 30 and bar [3.

It is to be pointed out that the bar l3 as generally marketed is simply a longitudinally elongated member permanently riveted at the left hand end to the mounting or casting Ill. At predetermined longitudinally spaced points it is provided with apertures to accommodate double headed rivets (not shown) which are used to hold similar cutting blades thereon. These plates are permanently held by the rivets and whenever one plate wears out and must be replaced it is necessary to file off the rivet and replace the plate with new rivets, etc. This is time consuming and inconvenient. For the present arrangement the plates 19 are easily held in place by the conical headed rivets of the style shown in Figure 9 in themanner illustrated in Figure 4. These rivets are allowed to remain permanently in place. By using the style of rivets which is shown in Figure 9, plates l9 can shank or rivet then sliding the plate from right to left. The clearance niches -28 facilitate this placement of the plates I9. In order to change one of the plates I9 it is necessary to remove the master or key cutter plate l8 by taking out the bolt or rivet 25 as the case may be. The manner of inserting and removing the plates I1 is slightly different but is perfectly clear, it being simply necessary to angle the plate with respect to the supporting rivets so that they can be inserted between the two parts I0 and I3 and easily slipped into place.

Novelty is thought to reside in the provision of a mounting bar having the headed permanently attached shouldered rivets to accommodate the slotted plates [1, I8 and 19, particularly in conjunction with the single key forming plate l8 which is permanently held in its key position by a bolt or equivalent permanent fastener 25. When once this is removed the remaining plates can be easily removed and replaced as is obvious. I

A careful consideration of the foregoing description in conjunction with the illustrative drawings Will enable the reader to obtain a clear understanding of the purpose, features and advantages, the explicit construction, and the invention as hereinafter claimed.

It is to be understood that minor changes in shape, size, relative proportions, and materials may be resorted to in practice without depart-- ing from the spirit of the invention or the scope of the invention as now claimed.

What is claimed is:

In a sickle bar for mowing machines in which is comprised a reciprocatory bar, cutting plates arranged edgewise in series and. superimposed flatwise on the bar, and means detachable from the outer end portion of the bar for normally holding said plates against edgewise movement, the combination with said reciprocatory bar and cutting plates, of rivets having shanks permanently secured in said bar at intervals in the length of the bar and also having enlarged shank portions bearing at their lower ends against the upper side of the bar, said enlarged shank portions disposed in the cutting plates and said plates disengageable from the rivets on edgewise movement of the plates after said first-named means is detached, and said rivets further having enlarged heads above said enlarged shank portions and arranged immediately above said cutting plates.

JOSEPH JAMES DAVIS.

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