Improvements in the Construction of Grinding and Sharpening Machines.
Year: 1899

page_text: Date of Application, 31st Oct., 1899-Accepted, 30th Dec., 1899
COMPLETE SPECIFICATION.
Improvements in the Construction of Grinding and Sharpening
Machines.
I, HARRY WILBUR BOLENS, of Number 200, Cential Avenue, in the City of Poit
Washington, County of Ozaukee and State of Wisconsin, United States, of
America, Manufacturer, do hereby declare the nature of this invention, and in
what manner the same is to be performed to be particularly described and ascor-
tained in and by the following statement -
This invention has for its object the production of a simple economical high-
speed grinding and sharpening machine designed piimally for sharpening the
knife-sections of mower and reaper sickle-bais, and which may be readily
converted into a machine for ginding the cutting edges of the guards or plates
of linger-bars, as well as harrow-disks, and various other agricultural implements,
and to these ends it consists in certain peculiarities of construction and combina-
tion of parts, as will be more particulaily set forth hereinafter with reference to
the accompanying diawings, and subsequently claimed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 represents a perspective view of a grinding and sharpening machine,
embodying my said invention, with the rockei-yoke and grinding-wheel cantie
in the primary or forward position requned for sharpening sickle-bai knife-
sections, when the sickle-bai has been detached from a machine
Figure 2 is a partly sectional elevation of the parts constituting the left-hand
portion of my said machine, looking from the nearly cential vertical planes
indicated by the dotted lines 2-2 in Figure 3, showing also a vertical cential
sectional view of the front portion of the base-frame, and the clamping device
attached thereto, and representing the rocker-voke and grinding-wheel carlet
swung back from the position shown in Figure 1 to the position required for
ginding finger-bai guards or plates, harrow-disks, and similar parts, without
detaching said parts from their respective machines, the relative positions of
the gunding-wheel and its diving-gearing (which are on the right-hand side
of the machine) in this converted condition of my machine, being indicated by
a dotted line diagram in this Figure 2.
Figure 3 is a partly sectional elevation of my machine, with the rocker-yoke
and gearing in the primary position shown in Figure 1, but omitting the grind-
ing-wheel care and its attached parts, and with the base-fiame in section,
on the line 3-3 of Figure 2, thereby also omitting the front portion of the base-
frame, and attached clamping device shown in Figures 1 and 2
Figure 4 is a detail sectional view, on the line 4-1 of Figure 2, illustrating
the construction and connection of the engaging ends of the side-bars of the
front and rear sections of the longitudinally adjustable base-frame
Figure 5 is an underside plan view of the plate forming a part of the clamping
device illustrated in Figures 1 and 2.
Referring by letter to the drawings A represents the rear section and A¹ the
front section of a rectangular frame constituting the longitudinally adjustable

page_text: base of my machine
Section A of said base-frame has the ends of its side-bais
in the form of housings 6 made to straddle and fit snugly on thickened pyramidal
ends of the side bais of the section A¹, and these engaging ends of the said
side-bais are secured together by bolts a extending vertically through longitudinal
slots a¹ in the tops of said housings, whereby the said longitudinal adjustment
of said base-frame sections 18 provided for, a further advantage of the just described
construction consisting in the fact that thereby the parts of the base-frame are
detachable for storage or shipment The side-bais of the section A of the base-
frame are connected by a cross-bar C, a short distance back of the housings b,
the upper surface of said cross-bar being flush with the upper edges of the side-
bars, and said cross-bar having a central transveise groove c
in its upper
surface, which engages with a transverse knife-edge rib d on the underside of
a plate D, extending across the base-frame, and being elevated to a plane abovе
the latter by reason of the height of said 11b exceeding the depth of said groove,
as best shown in Figure 3. Fiom each end of said plate D there extend the
upwardly and rearwardly inclined standards, E and E¹, said standards and their
connecting plate D constituting what I term the standard-yoke
The sides
of the base-fiame section A and of said standard-yoke are provided with opposing
outer lugs e el, secured together by bolts d', and owing to the engagement of
the ibd with the groove c' in the cross-bai C, affording a rocker-bearing connection
of the standard-yoke with its support, it will be understood that I provide for
a lateral tilt-adjustment of said standard-yoke
The standard E has its upper end provided with an eye for engagement of a
pivot-stud f extending inward from a link F, and the upper end of the other
standard E is provided with a pivot-stud f extending inward through an eye
in the adjacent end of a link F, spring-keys or pins g being engaged with taid
pivot-studs, against washers h¹ to prevent displacement of said links. These linhs
are connected intermediate of their ends, by a bar G, the three parts F F G being
in one casting, and constituting the pait which I term the 1ocke-yoke. The
bar G is provided with a central socket for the reception of a handle H, said
socket being formed by a series of loop-swells 9 g, cast integrally with said bai.
The standard E is provided with a lateral outwardly projecting lug h, and the
adjacent link F 18 provided with a lug-opposing stop-arm to which 18 pivotally
connected a hook-latch 2, for engagement with said lug, when the machine is in
the secondary position shown in Figure 2, as hereinafter described
The upper
or outer end of link F is provided with an eye for the reception of a pivot-stud j
projecting inward from the adjacent end of a side-bar I, which forms one member
of the grinding-wheel carriei, herein before referred to, said carrier consisting
of a skeleton frame, having two side-bars I and I', united by a biace-bar I,
intermediate of its ends; the other side-bar I is provided with an eye engaged
by a pivot-study extending inward from the upper or outer end of link F¹, the
said ends of the caner being held in position against the adjacent ends of the
rocker-yoke links by means of spring-keys or pins driven through openings
in the pivot-studs, and bearing against interposed washers, while the
opposed ends of said carrier, beyond the brace-bar I", form bearings for a tians-
verse shaft P, to which the grinding-wheels are made fast, as hereinafter
explained.
Jdesignates the laterally projecting cylindrical head of link F of the rocker-
yoke, said head having an outwardly projecting arbor gid therewith, of
less diameter than that of said head, and in line with the described pivot-stud 7,
and loosely mounted on said arbor 11 18 the outwardly extended hub K¹ of a
sprocket-wheel K, and this hub is cast with a series of radial cogs to form a
pinion L, in mesh with a spur-wheel M, which is loosely mounted on an arbor
extending outwardly from a branch E¹ of standard E, these wheels being held
in place on their arbors by spring-keys or pins m¹ m² in opposition to interposed
washers nn. The spur-wheel M has a handle M' projecting laterally fiom its
periphery, for operating the train of gears, as hereafter described.

page_text: The standard E¹ and its branch E" form a fork, in which clearance is had
for the rotation of the sprocket-wheel K and the run of a link-belt or aprocket-
chain N engaged with said wheel and with a sprocket-pinion 0 fast on the
transverse shaft P hereinbefore named. This shaft extends outward from each
side-bar of the carrier, and has its ends reduced to form annular abutments, and
these reduced ends are screw-threaded Between the side-bars of the caniel a
grinding device, consisting of a double grinding-wheel R, in shape like two cone-
frustums united base to base, 18 made fast on the said shaft P, this wheel R
being for grinding sickle-bar knife-sections When it is desired to grind hanow
disks, or other parts of machines, without detaching said parts, suitable grinding-
wheels are made fast to one or both of the projecting ends of the said shaft P
(one of such wheels being shown at Q in Figure 1) and when the grinding-wheel.
carrier is swung back for this purpose, as indicated in Figure 2, it is not necessary.
to detach the grinding-device R, as same would not then be in the way, but when
sickle-bar knife-sections are to be ground, as presently explained, it will be
necessary to remove the end-wheel (such as Q) from the shaft P, which can
quickly be done, as said wheels are designed to be held in place on the shaft-ends
by an ordinary clamp-nut operated by a common wrench, and at 18 intended
that each machine furnished to the trade shall be accompanied with a complement
of gunding-wheels designed for various grinding operations, any one of said
wheels to be attachable to either end of the shaft P
The standard E is provided with a lug n, to which one end of a spual tension-
aping S 18 connected, and when the machine is arranged as shown in Figure 1,
with the grinding-wheel carrier in position for grinding sickle-bat knife-sections,
the other end of said spring S 18 hooked over a lug m on the side-bar I of said
carrier, as shown in said Figure 1
T represents a plate having a semi-spherical lug p depending from its under-
side midway of its width which engages a socket-biacket q upon the inner side
of the end-bar of section A¹ of the base-frame, and said plate has another and
longer depending lug adjacent to its inner or upper edge, which last named
lug rests upon a cross-bar s of said frame-section A', all as best shown in Figure 2.
The length of said lug is such that the plate T, when in place upon the base-
fiame section A¹, has inclination in an upward direction toward the standard-
yoke, and said plate and the side-bars of the base-frame section A' are provided
with opposing lateral lugs tt, secured together by bolts ', the bolt openings in
lugs being curved slots r³, so that the aforesaid plate T may have a certain
amount of rotary, as well as tilt adjustment, the semi-spherical fug p and socket-
bracket g constituting a ball-and-socket joint that permits of such adjustments.
The said plate T is provided upon its upper side with triangular ledges u that
serve as rests for knife-sections of a sickle-bar, and with a lug-extension v on
its lower end or edge, from which lug there rises a pivot-post r, which 18 screw-
threaded at its upper end U represents a clamp, pivotally mounted on said
post, and having a handle z, and two divergent jaws T¹ T₁, which jaws are
adapted to rest on the sickle-bar whose knife-sections are to be ground, and to be
held firmly thereon, by means of a set-nut w, run on the said sciew-threaded
upper end of the pivot-post r. As shown in Figure 2, the base-frame of the
machine may be provided with apertured lugs y for engagement of screws 01
bolts employed to connect said machine with a bench or other support
When a sickle-bar has been detached from its machine, and clamped between
the plate T and clamp U with its knife-sections resting on the ledges of said
plate, and the various parts of my machine arranged as shown in Figure 1
(except that, as before stated, the end-wheel Q 18 omitted) the operator brings
the double grinding-wheel R down upon the said knife-sections, by a forward
pull on the handle H of the rocker-yoke (the action of the spring S serving to
increase the pressure of the grinding-wheel R on the knife-sections) and then
by turning the spur-wheel N by its handle M, the described train of gearing
rapidly revolves the shaft P and grinding-wheel R, and quickly sharpens the

page_text: knife-sections to the required degree, the operator meanwhile manipulating the
spring-controlled carer by the handle H, so as to bring the ginding-wheel R
on and off the knife-sections as required, from time to time, and by having the
clamp-plate T in pivotal and tilt-adjustment on the base-frame, and the standard-
yoke also in tilt-adjustment on said fiame, the necessary adjustments can be
readily and quickly made, and as said base-frame itself is made in sections adjust-
ably connected, as herein set forth, my machine is capable of exceedingly fine
adjustment for work on sickle-bar knife-sections
When it is desired to adjust the machine for the ginding or sharpening of
harrow disks, or other cutting implements without detaching the same from the
machines of which they form a part, a grinding wheel (such as Q) 18 made fast
on an end of the shaft P, in the manner already described, and then the sping S
is unhooked from the lug m on the carrier side-bar I, and the said carrier and the
rocker-yoke are swung over back of the standard-yoke, this action bringing the
stop-arm of said 10cker-yoke against the lug on the standard E, and the
hook-latch 18 then caught over said lug, whereby said rockei-role is held in
the approximately horizontal position indicated by the dotted lines in Figure 1,
and the full lines in Figure 2, and the grinding-wheel is brought on and off
the disk or other part to be ground, by the manipulation of the canier by the
handle H, the said grinding-wheel being revolved as before by the handle if¹ on
the spur-wheel M, through the herein before described drive-gear
From the foregoing it will be understood that the machine above specified may
be converted from a grinder of one kind into that of another kind without taking
it apart, and without any change at all further than the securing of the appro-
pirate grinding-wheel or wheels to the shaft ends, or the removal of the same
therefrom, according to the special service any time required.
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..
1. The horizontal rectangular base-fiame in two sections, one section having
the ends of its side-bars thickened and of pyramidal contour, the opposing ends
of the other fame-section being in the form of housings in straddle-fit upon said
Bide-bar ends of the former frame-section, and means for maintaining the union
of said frame-sections
2 The rocker-bearing standard-voke, the adjustable sickle-bai clamp, the
rocker-yoke in connection with said standard-yoke, the carrier in pivotal connec-
tion with the rocker-yoke, the ginding-device rotative between side-bais of said
carrier, driving-mechanism for said grinding-device, and the tension-sping for
the aforesaid carrier
3. The horizontal base, comprising sections in longitudinally adjustable con-
nection, the rocker-bearing standard-yoke, the adjustable sickle-bar clamp, a
rocker-yoke in connection with said standard-yoke, the carrier in pivotal connec-
tion with the 1ocker-yoke, the grinding-device rotative between side-bais of
said carrier, driving-mechanism for said grinding-device, and the tension-spring
for the aforesaid carrier
4 The rocker-yoke in connection with standards, the carriei in pivotal connec-
tion with said rocker-yoke to be swung forward or back of the standards, means
for holding the rocker-yoke stationary in approximately horizontal position
back of said standards, the ginding-wheel shaft mounted in said carrier, and
the drive-gear for said shaft.
5 The standard-yoke in rocker-beaung on the base, the locker-voke in connec-
tion with said standard-yoke, the canier in pivotal connection with said rocker-
yoke to be swung forward or back of the standard-joke, means for holding the
rocker-yoke stationary in approximately horizontal position back of the aforesaid
standard-yoke, the grinding-wheel shaft mounted in said carrier, and the dive-
gear for said shaft.

page_text: 6. The standards, one of which is provided with a branch that therewith
constitutes a fork, the rocker-yoke in connection with said standards, a carrier
in pivotal connection with the rocker-yoke, the sprocket-wheel carried by said
1ocker-yoke, the pinion integral with the sprocket-wheel, the driving spur-wheel
mounted on an outer arbor of said standard-branch and in mesh with said pinion,
the grinding-wheel shaft mounted in the carrier and provided with the sprocket-
pinion, the link-belt o sprocket-chain arranged on said sprocket-wheel and
sprocket-pinion to run in the fork of which the aforesaid standard-branch forms
a part, and means for holding the aforesaid rocker-yoke in approximately hori-
zontal position back of the aforesaid standards
7 The rocker-yoke in connection with standards, the carrier in pivotal connec-
tion with the rocker-yoke to be swung forward or back of said standards, means
for holding said rocker-yoke in approximately horizontal position back of the
standards, the shaft mounted in the carrier and extended therefiom for attach-
ment of a grinding-wheel, the grinding-device for sickle-bai knife-sections per-
manent on said shaft between the side-bars of said carrier, the dive-gear for the
shaft, the sickle-bar clamp arranged forward of said standards, and the tension-
spring attachable to the aforesaid carriei.
JENSEN & SON,
77, Chancery Lane, London, WC, Patent Agents.
110100
JENSEN & SON,
77, Chancery Lane, London, WC, Patent Agents.