Improvements in Lawn Mower Grinders.
Year: 1898

page_text: Date of Application, 28th Mar., 1898- Accepted, 18th June, 1898
5
COMPLETE SPECIFICATION.
Improvements in Lawn Mower Grinders.
I, WILLIAM WELLINGTON BOUGHNER, of Hamilton, Province of Ontario,
Dominion of Canada, Nurseryman, do hereby declare the nature of this invention,
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:
My invention consists of a horizontal, emery bar hinged or pivoted to certain
clips or clamps which are capable of adjustment on the binding bar or axle of
the mower, in order that the revolving knives of the mower may engage with said
emery bar, for grinding, or sharpening said knives.
The objects of my invention arc, first, to provide means for grinding the knives
of a lawn mower in a most thorough and satisfactory manner, and second to afford
facilities for the proper and expeditious manner of attaching the device, and of
adjusting the same to grinding position on the mower.
In the drawing, Figure 1, is a plan of my knife grinding device, attached to
the binding bar, or axle, of a lawn mower, showing one section, or knife, of the
revolving spiral knives, and the fore-part of the knife engaging with the emery
bar.
Figure 2, is an enlarged view of the device, attached, and Figure 3, is an end
elevation of the grinding device.
Figure 4, is an end view and modification of Figure 3, the binding bar of the
mower being of a rounded flat section hence the clip is made to suit said binding
bar.
Figure 5, is a view of an emery bar, with clip, specially designed and constructed
in two parts with bolt for attachment to and adjustment on a revolving axle of a
mower.
In order to more fully understand my device I will indicate the one revolving
spiral knife shown, of a lawn mower by K, and the binding bar or axle, of the
mower, by A.
To this binding bar or axle A, the emery or grinding bar 2, is attached by
means of its clips 3, which are capable of turning either way, on said binding bar,
therefore adjustable, and held in approved position by their set screws 5, which
screw against the said bar or axle. The emery bar 2, is connected to its clips 3,
by means of lugs 6, on said bar, and lugs 7, on said clips as hinges, with pivotal
pins 8. This pivoting or hinging of the emery bar to the binding bar A, of a
mower by means of the adjustable clips, is a very important element in my inven-
tion, by the fact that the face of the emery bar is allowed to adjust itself to the
revolving spiral knives of the mower.
As these spiral knives revolve, when being ground, the fore end of one knife
engages with the emery bar at the same time as the latter end of the adjoining
knife, and so on.
It will be observed that the said clips will be of sufficient size to allow them
to be attached to varying diameters of the binding bars or axles of mowers, in
order to obviate any difficulty in attachment. This hinged emery bar on account
of its operation in conjunction with adjustable clips possess an almost universal
capability:
These different forms and variations in the construction of these binding bars
and axle clips are necessary and essential in order to suit the different sizes,

page_text: designs and constructions of lawn mowers, though a general idea and principal of
adjustment of the emery bar to and on a lawn mower prevails throughout.
It will be perceptible that the emery bar can be brought to bear against the
revolving knives, of the mower, when the distance is very slight between said
knives and the binding bar, or axle, this is accomplished by the adjustable clips
on said binding bar and the pivotal centres of the emery bar.
1.
In order to bring the upper edge-of the emery bar into close proximity to the
knives, a spring 12, is provided on both pivotal pins 8, to engage with the upper
and rear parts of the emery bar. These springs give and allow a certain tension
and stability to the said emery bar. It will not be absolutely necessary to detach
this grinding device from the mower, when the said grinding bar is not being used,
as the same may be turned back on its pivots, or hinges, out of the way of the
revolving knives of the mower, this is an important feature of my invention.
The emery or material composing this grinding bar 2, may be partially encased,
that is, in a casing which allows the face and the outer part of the sides, or edges,
of the inserted emery, or grinding material, to be exposed.
This emery bar casing is seen, more fully, in the enlarged views of the drawing
and indicated by 16, with its rear lugs 6.
When the binding bar of a lawn mower is of a non-circular section, then the
modification as shown in Figure 4, of the drawing, may be used, each jaw 20,
of the clip has inner lips 21, which clip and fasten to a binding bar, by means of
the bolt 22, through outer ears, 23, one of these ears has a lug 24, to which is
hinged the emery bar, in a similar manner as the clips previously referred to.
Various changes in the form, proportion and minor details of my invention may
be resorted to without departing from the spirit and scope thereof, hence I do not
consider myself limited to the precise construction as herein shown and described,
especially in the particular and precise formation of the clips and grinding bar,
but believe that I am entitled to all such variations as come within the terms as
set forth.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is:-
1st. A lawn mower grinder of the character described, consisting of an emery
bar having rear lugs, clips having lugs to hinge or pivot to lugs of said emery bar,
said clips capable of adjustment and fastening to a binding bar or axle of a lawn
mower by means of set screws, as described.
2nd. A lawn mower knife grinder, of the character described consisting of an
emery bar having lugs pivoted to the lugs of clips, which are adjustable on and
fastened to the binding bar or axle of a mower by means of set screws, springs on
said pivots to engage with the outer rear edge of said emery bar to give certain
tension to same, as described.
3rd. A lawn mower grinder consisting of an emery bar in a casing having rear
lugs to hinge or pivot to lugs on clips which are suitable for fastening to mower
binding bars of a non-circular section, and secured thereto, by means of its inner
lips and bolt, as described.
4th. The combination with a lawn mower having a revolving action of clips in
parts for attachment to and capable of adjustment for said axle, and an emery bar
pivoted to and capable of being fastened to the outer ends of said clips in position
to operate on the revolving knives of the mower as described.
Dated this 28th day of March 1898.
BOULT & WADE,
Agents for the Applicant.