US1347330A - Cutter-bar - Google Patents

Description

LOUIS N. HATHAWAY, MOSES W. TVVOMBLY, AND ELMER I-I. HAMITIIOND, OF LAOONIA,

NEW HAMPSHIRE.

CUTTER-BAR.

Application filed May 8,

To all whom it may camera:

Be it known that we, LoUIs N. HATHA- \VAY, Mosns V. TwoMBLY, and Emma H. HAMMOND, citizens of the United States of America, and residents of Laconia, in the county of Belknap and State of New Ha1npshire, have invented new and useful Improvements in Cutter-Bars, of which the followin is a specification.

Our invention relates to the construction of cutter bars for mowing, reaping, and similar agricultural machines, and has for its objects the provision of improved means for detachably securing cutter blade sec tions to the bar or back strip which carries them, for securely retaining said blade sections on the back strip, and for readily and easily removing and replacing such cutter blade sections whenever .this is required.

It is not infrequently necessary to remove and replace cutter blade sections while the machine'is at work in the field; our improvements are intended and adapted to facilitate such operations, to reduce the incidental mechanical operations to a minimum and to prevent accidental loss of machine parts.

In the drawings hereto annexed, which illustrate our invention and exhibit it in the form believed by us to be the best,

Figure 1 shows, in top plan view, partly broken away, a portion of a cutter bar;

Fig. 2 shows the same in rear elevation;

Fig. 3 is a cross section taken at the line of Fig. 1, and shows also sundry associated machine parts which are omitted from Fig. l; and

Fig. 4 is a perspective view of one of the blade-holding bolts.

The mechanical environment to which our improvements are adapted is to be found in any mowing or reaping machine which employs a reciprocating cutter bar,'comprising a series of blade sections mounted on a back strip which is fitted to slide in a framebar, and is reciprocated by appropriate mechanical connections with the running gear of the machine. The cutter blade sections are of the usual shape, and are designated in the-- drawings by the numeral 1. These are mounted on the reciprocating back-strip 2, which slides in front of the frame bar 12. Bladeretaining fingers or plates 13, and guards 14, are such as are usually employed.

The cutter blade sections 1 are arranged Specification of Letters Patent.

Patented July 29, 1920.

1920. Serial No. 379,794.

in series, and in marginal contact with each other, along the back strip Each blade section is marginally recessed at =9, so that the recesses of adjacent blade sections-register with each other and provide a bolt-hole, in which the cylindrical shank of a bolt 3 fits closely, so that the cutter blade sections contour departs from a surface of rotation (such as a cylindrical surface) so that a bolt, conformed to fit the bolt hole will not be able to rotate in the hole. In this respect the bolt holes are functionally equivalent to squared bolt holes, which also depart in contour from a surface of rotation. But in order to deplete the structural strength of the back strip 2 as little as possible, the recesses S are disposed longitudinally of the back strip, thus leaving as much metal as possible in cross section between the bolt hole and the edges of the back strip.

The holding bolts 3 have the usual-screw threaded shanks, but are provided with lugs or projections 1010, adjacent to the bolt head 11, which, when a bolt is inserted in a hole 7 in the back strip, are lodged in the recesses 8, and securely retain the bolt against any tendency to back ofif.

The holding-down nuts 4, which are threaded to takethe bolts 3, are elongated, and sufiiciently resilient to yield at their ends and ride over projections 5, 5, which rise above the surface of each blade-section 2. These projections, of which there are two on each blade section may conveniently be formed by means of a die which, indenting the lower surface of the blade-section forces out the projection on the upper surface. The projections are so located on the blade sections that when a nut 4 is screwed home and forced over the two projections (one on one blade section, the other on an adjoining blade-section) the nut lies with its long axis about parallel with the back strip 2. When thus secured, the nut 4 is prevented from backing off by the projections 5, which however, being rounded, as indicated by the shading in Fig. l as shown in elevation in Fig. 2, have such shape that when it is desired to loosen the nut, the ends of the nut will spring upward and ride over the projections. An ordinary wrench will serve to manipulate the nut 4 either for setting or loosening.

To remove a blade section and replace it} with another, all that is necessary is to remove the nut 4 from one of the bolts 3 which engage and hold the blade-section, and to loosen the similar nut from the other holding-bolt. The blade can then be lifted out, and another one inserted. The only pieces which have to be detached in order to take out a blade are the bolt 3 and nut 4t which were selected for removal. As this nut and bolt will naturally be removed by the lingers of the workman-having been released from theirtight hold by a wrenchthe liability of their being mislaid or lost is very small.

It will be apparent that the back strip 2 does not have to be disturbed, and that the entire repair-ope'ation can be easily performed in the field, with very little :loss of time. I

jections on the blade-sectionsto engage said nuts. 7

2. In a cutter bar, the combination of a series of cutter blades havin mutually registering marginal recesses to form bolt-holes, a back strip on which the blade sections are carried provided with recessed bolt holes,

1. In a cutter bar, the combination of bolts having lateral extensions to engage the recessed bolt holes, passing through the back strip and said bolt-holes, elongated'nuts', and projections on the blade sections to engage said nuts. 7 ,7 V

3'. In a cutter bar, the combination of a series of cutter blades, having mutually registering marginal recesses to-to'rm bolt-holes,

' a back strip on which the blade sections are carried, provided with bolt holes recessed longitudinally of the back strip, bolts 'having lateral extensions to engage the recessed boltholes, passing through the back strip and said bolt holes, elongated nuts, and projections on the blade sections to engage said nuts. s v

.4. In a cutter bar, the combination of a series of cutter blades having mutually registering marginal recesses to form bolt holes, a back strip on which theblade-sectionsare carried,bolts passing through the back strip and said bolt-holes, resilient nuts, and projections on the blade sections to engage said nuts. r

5. Ina cutterrbar, thercombinationota V series of cutter blades having mut'ually registerlng marginal recesses to form bolt holes, aback strip on which the blade-sections are carried, bolts passing through the back strip and said bolt-holes, resilient elongated nuts,

and projections on the blade sections to en-.

gage said nuts. I 1

Signed by us at Laconia, New Hampshire, this sixth day May, 1920.

LOUIS N. HATHAWAY. MOSES w. TWOMBLY; 1 .ELMER 1-1. HAMMOND.

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