US 1218511 A
Description (OCR text may contain errors)
H. BERGLUND` MEANS FOR SECURING KNIFE BLADES T0 A KNIFE BAR. APPLICATION FILEDAPR. 2|. |916.
1,21 8,5 1 1. Patented Mar. 6, l1917.
narran sraras Partnr @Wim-Q HERMAN BERGLUND, 0F MAHTOWA,`I-IINESTA, ASS-IG-.NOR7 OF-ONEjHALF T0 LAWRENCE COMPAGNIE, OF DULUIH,`MINNESOTA.
MEANS FOR SECURING KNIFE-BLADES TO .A KNIFE-BAR.
Application filed April 21, 1916.
To all whom/t may concern.'
Be it known that I,.HERMAN BERGLUND, a citizenof the United States, residing at Mahtowa, in the county of. Carlton and State of Minnesota, have invented new and useful Improvements in Meansvfor'Securing Knife-'Blades to a Knife-Bar, of which the following is a specication. l
This invention relates to means for securing knife blades to a knife bar, and it consists in the novel features hereinafter described and claimed.
An object of the present invention isto provide an efficient means for holding the knife bladesupon a knife bar in theeuttmg apparatus of a mowing or like machine, and the present invention is designed to be used to advantage as a substitute for the rivets which are now commonly usedi for accomplishing the same purpose:
Incident to the use of rivetsvseveral disadvantages exist, among them being that when it is desired to remove one ormore knife blades fromthe bar it is necessary to cut the rivets and punchA them out of the knife blades and bar. This operation frequently expands the bar and consequently v 'the bar has to be dressed orreshaped when new knife blades are placedfthereon. By the use of the present invention there 1s no possibility of expanding the bar or distort-1 ing its shape by removing the knifeblades therefrom, and furthermore, the blades may be easily and quickly removed for substitution or sharpening.
With the above objects in view the present invention consists in providing upon the knife bar fixed studs adapted to pass transversely through the knife'blades.v Some of the said studs are longer than others, and the longer studs are threaded at their upper ends and project above a strip which is positioned at the upper sides of the knife blades. Nuts are screw threaded upon the threads of the extended studs. The knife bar is provided at its rear edge with an upstanding flange with which is hingedly connected a bar adapted to swing. over the said strip, the said bar being provided withrecesses which snugly receive the said nuts and prevent the same from turning after they have been set in position above the strip. The said bar, when closed down upon the strip, extends rearwardly kbeyond the Specification of Letters Patent.
Patented Mar. 6, 1917.
Serial No. 92,689. Y
flange and is adapted to lie over the forward Fig. 2 is a transverse sectional view of the same cut on line 2 2 of F ig. l. j
Fig. 3 is a fragmentary plan view of the saine with parts in section.
Fig. 4 is a similar front view with parts 1n section.
Fig. 5 is a transverse sectional view cut on the line 5 5 of Fig. 3. Y
As illustrated in the accompanying drawing, the knife bar l is provided at its rear edge with anpupstanding flange 2 disposed at right angle to the body portion of the bar. Studs 3 passtransversely through the forward portion of the bar l and are `lixed with relation to the same. Some of the studs 3 are longer than others, and the longer studs are threaded at their upper ends as at 4. The knifeblades are of the usual configuration and are provided in the vicinity of their rear edges with openings which receive the studs 3.
A metallic strip 6 lies upon the upper surfaces of the rear portions of the blades 4 and is provided with openings which: receive the upper portions of the studs 3. rEhe upper ends of those studs which are not threaded are flush with the upper surface of the strip 6, while the upper lends of the threaded studs project above the upper surface of the strip 6. Nuts 7 are screwed upon the threaded ends 4 of the said projecting studs and the lower faces of the nuts bear in close contact against the upper surface of thev Y with recesses 9 which snugly receive the nuts 7 and hold the said nuts against turning movement upon the studs on which they are mounted. The flange 2 of the knife bar l is located ink advance of the forward edge of the finger bar l0 of the cutting apparatus and when the forward portion of the bar 8 is swung down in'close contact with the upper surface of the strip 6, the rear portion of the said bar 8 lies over the forward edge -portion of the cutterV bar 10 and in close contact with the saine as shown in Fig. 2 of the drawing.
ln operation the bar 10 remains stationary while the bar l is reciprocated back and forth in 4front of the same in the usual manner.
W hen it is desired to remove one or more of the blades 5 for substitution, sharpening or other purposes, the knife bar l is detached from the machine and then the bar 8 may be swung freely from over the strip G. By using a wrench the nuts 7 may be unscrewed from the threaded ends of the studs Lland thus the knife blade 5 and the strip G are liberated. After lifting the strip 6 from over the upper ends of the studs 3, any particulail knife 5 may be removed by liftingit off the said stud. Then another knife may be substituted in its stead or in case the removed knifeis repaired or sharpened it may be replaced. During this 'operation it will be seen that no strain whatever is applied to rthe knife bar l, consequently the said bar is not distorted and wlien'the )arts are assembled upon the machinethey fit accurately and may he operated without undue friction.
From the above description taken in conjunction with the accompanying drawing it will be seen that simple and ellicient means is provided for holding the knife blades in position upona knife bar and that the device may be easily and quickly manipulated for the purpose of removing one or more of the knife bars and replacing others or the Copies of this patent may be obtained for said extended portion and a bar hingedly:
connected with the flange at the upperrear edge thereof and having recesses which receive the said nuts. y
2. ln a cutting apparatus a knife bar having at its rear edge an upstanding flange, studs mounted upon the knife bar, knife blades having openings which receive the studs, a strip lying transversely across the knife blades and having openings whichy receive the studs, some of the said studs having threaded portions which extend above the upper surface of the strip, nuts Vmounted on said extended portion and abar hingedly connected with the flange at theupper rear edge thereof and having recesses adapted to receive the nut-s the last 4mentioned bar also having arportion disposed behind the rear surface of the langeand adapted to lie l above the finger bar ofthe cutting apparatus.
in testimony whereof I affix my signature in presence of two witnesses.
Witnesses five cents each, by addressing the Commissioner of Patents, Washington, D. C. i Y