US817157A - Lawn-mower. - Google Patents

Description

No. 817,157. m PATENTED APR. 10, 1906,

W. -.H. GOLDWELL.

LAWN MOWER.

APPLIOATION FILED DEO.11, 1905.

[NVENTOR Alfarneyp WlLLIAM coLnwELL, or un'wnunen, New Year. it' I awni To all whom it may concern.-

Be it known that I, WILLIAM H. CoLn- WELL, a citizen of the United States, residin at Newburgh, in the county of Orange an State of New York, have invented certain new and useful. Improvements in Lawn- Mowers; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

' My invention consists in thenovel features hereinafter described, reference bein had to the accompanyin drawings, which ifiustrate one form in which I have contemplated embodying my invention, and said invention is fully disclosed in the following description and claims.

In the accompanying drawings, Figure 1 represents a central vertical longitudinal sec tion of a lawn-mower embodying my invention. Fig. 2 represents a detail sectional view of the knife-bar and stationary'knife or cutter detached from the machine, drawn to a larger scale, Fig. 3 isa partial top plan view of the knife-bar and stationary cutter. Fig.

' 4 is a detail perspective view of the stationp across the machine my knife or cutter detached.

My invention relates particularly to the knife bar and stationary cutting blade or knife of a lawnmowing mechine. chines as ordinarily constructed it is customcry to use a cast-iron knife-bar extending and carrying the stationary blade-or cutter, the latter-being usually a flat thin piece of steel which is secured by means of rivets or screws to the knife-bar, and

* thereby maintained in proper relation to the rotary cutter of the machine. In sta tionary knives of this character it is ound that they frequently become bent between their ends so that the cuttin edge is no lon or straight, and therefore t e stationary blaf e does not act accurately throughout its entire len th in cooperation with the rotary cutter. bending or deflection of the stationary blade occurs more frequently in machines for cutting a com aratiyely wide swath, such as hi h-class hand-machines, horse-. mowers, an motor-mowers. oreover,it is. necessary to have the forward edge of the knife-bar, which is usually made of cast-iron,extremely thin and extended as close as ossible to the cutting edge, the knife-bar Specification of Letters Patent.

In maeing made thin at this point in orp knife-bar on account of the excessive thininvention is toform the the shape of a channel'- of the knife or blade beand back edges with v Patented dpril 1.0, 1906-.

Application filed December 11,1905, Serial No. 291,329. i i

der to enable the rotary cutting-blade to clear t and discharge thecut rass over it, so that 1t is difficult to secure t 'e stationary blade with the desiredrigidityto the cast-iron 6o ness of the latter and the lack ofsuflicient metal to give the attaclfing-screws asufii** an inclined upwardly-extending flange or lip;

giving the blade great rigidity throughout its entire length.

My invention also contemplates the use of aknife-bar to which this channel-knife is attached, so constructed that screws will enter portions of the knife-bar where suflicient metal is provided to give the screws a good bearing, said knife-bar being also formed so as to afford rotection to the forming a cutting edge and at the same time the attaching- I rear cutting edge of the knife to prevent its becoming 1n ured or dull. It will follow from this construction that after the front edge of the knife has bedome wornand dull the knife itself may be reversed u on the knife-bar, so as to bring the fresh e go into operative relation with the rotary cutter.

fication I have shown in view of a lawn-mower embodying my present improvement, in which A represents one of the side frames of themower, of-which there are necessarily two. the ground-wheels, of which there: are also two. (3 represents the rotary cutter, usually termed the wiper, and D represents the rear supporting-roller of the machineu Said parts form no art of my present invention and need not e further describedjit bein understood that the usual or any preferre means for driving the rotary cutter from the. ground-wheelsB are present in the machine in the drawings forming art of this s eci- Fig 1a sectibnal Brepresents one of and that the machine here illustratedise hand-operated machine.

E represents my improgved knife bar, which is preferabl formed of castaron in the gen eral sha e i lustrated in Figs. 1, 2, and 3 l and provide at each end withan tending attaching-in e, provide with a central aperture e" an with horizontally-disposed shoulders c e on o posite sides of the central aperture; The rnifebar-E is .in-

igpwardlyem IIO ' serted between the two side frames A of the machine and secured pivotally by means of bolts e one of which is shown in Fig. 1, which pass through the central apertures e in the attachingdugs and clamp them to the side frames. Each side frame is also provided with lugs a a, (see Fig. 1,) having threaded apertures to receive adjusting-screws a a, which are'passcd through said lugs and engage the shoulders c e of the knife-bar, from which it will be seen that by loosening one of protecting ollset portion for the rear edge of the channel knife blade. The bottom face of the knife-bar is preferably planed, and I prefer to core out the central portion of this bottom face to reduce the amount of machine-work on the bar, asshown ate leav- "ing a front and 'reari-planed 'bearinglf i lortion 0 i la 6 e to receive the central ortio'nj seating therefor. knifebar E iis'also provided at intervalsjwith threaded "apertures 6 located some "little "distance back from its front edge, where a sufficient thickness of metal is provided without-"danger of interfcring withitlierotary cutter.

I Frepresentjshmy improved stationary kn feblade, (shown in detail in Fig. 51,-);which comprises a central portion having it's'longitudinal edgesturned upward, preferably at an.

obtuse angle to the central portion, to form lateral strengthening-flanges and giving the ened on 'outen ed g edge-adapted tglcooperate' with the rotary knife-blade the shape of a channel-iron. Each of the upturned portionsf isground or sharpupper face'; thus forming at its nacute-angle cutting surface or cutter C. The central portion of the blade F is provided at intervals corresponding with the intervals between the apertures e of the knife-bar with apertures f arranged in pairs 1 in line transversely of the blade, as clearly shown in the drawings. The stationary blade F is placed against the bottom face of the knifebar with its central portion in contact with the planed portions 6 of the knifebar, its front upturned flangefsllghtly n advance of the knife-bar, and its rear upturned flange lying within the protecting offset portion e of the knife-bar. The blade is secured in this position by means of a series of screws f which are passed through the rearmost holes f in the blade and into the threaded apertures e in the knife-bar, thus clampenabled to use longer screws in securing the blade to the knife-bar.

It will be obvious that the blade F can be reversed at any time when itis desired by removing the screws f and swinging the knife-blade end for end, m which case the 1 screws would be passed through the other set of apertures f, which would then be brought to the rear.

What I claim, and desire to secure by Letters Patent, is 7 1.- Areversible stationary knife for lawnmowers consisting of a channel-shaped blade having upwardly-extendinglongitudinal edge portions forming cutting edges'at opposite sides of the blade, and at the same time stifl ening said blade, the central fiat portion of said channel-blade, between said upturned cutting edges being provided at intervals with means for securin said blade to the statially as described.

blade having u turned longitudinal edge portions 'dispose( atan obtuse angle to the central portion of the blade, the top faces of said 'upturnedportions being substantially parallel to the central portion of the 'blade, and forming acute-angled cutting edges at each edge of the blade, and also stiffening the blade, said central portion of the blade being provided at intervals throughout the length of thc blade with apertures to receiveretairling devices for securin the blade to the stationary knife-bar of a awn-mower, substantially as described.

3. In alawn-Inower, the combination with the knifebar'provided with a recessed portionadjacent to its rear part and a channelshaped knife-blade having upturned longitudinal edge ortions forming cutting edges, one ofsaid edges bein ada ted to lie within the recessed portion of the nife-bar and attaching devices engaging the said blade and knife-bar at intervals throughout their length, substantially as described.

4. In a lawn-mower, the combination with a knife-bar provided with a series of apertures at intervals throughout its length, of a channel-shaped knife-blade having its longitudinal edges upturned to form cutting edges and its central portion provided with securing-apertures arranged in pairs and at intervals corresponding to the intervals of the apertures in the knife-bar and detachable securing devices for engaging apertures in said 2. A reversible stationary 'knlf blade for} lawn-mowers consisting of a channel-shaped} blade and knife-bar to secure the parts together, substantially as described.

5. In a lawn-mower, the combination with theknife-bar having its bottom face provided with lane portions to receive a stationary knifelade, and having a longitudinally-extending recess in rear of said plane portion, of a channel-shaped knife-blade having itslongitudinal ed es upturned'to form cuttin edges, one of wii recess of the knife-bar, sai blade being rovided with securing-apertures arrange 111 l ch is ada ted to lie in said Witnesses:

pairs transversely of vals throughout its length and detachable securing devices engagin certain of said apertures inthe blade and a so engaging a seriesof apertures in the knife-bar, substantially as described. 1

In testimony whereof I afiix my signature in thepresence of two witnesses.

WILLIAM H. COLDWELL.

A. W. MAPES, "CHAS. KOOLDEN;

the blade and at inter

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