Improvements in Grinding Machines for Harvesting Knives, also applicable for Grinding Sickles and for other like Purposes.
Year: 1899

page_text: Date of Application, 17th Nov., 1899 -Accepted, 27th Jan., 1900
[Communicated from abroad by THE PLANO MANUFACTURING COMPANY, a Corpora-
tion organized under the laws of the State of Illinois, and having its principal
office at Chicago, Illinois, United States of America, Manufacturers.]
Improvements in Grinding Machines for Harvesting Knives, also
applicable for Grinding Sickles and for other like Purposes.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45, Southampton Buildings, in the County of Middlesex, 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 relates to grinders and its object is to provide a grinder both
for harvester knives, sickles, and the like, and for general purposes. My grinder
embodies a novel construction and operation as well as novel adjustments of
parts.
In the accompanying drawings, Fig. 1 is a plan view of my grinder or machine;
Fig. 2, a front elevation thereof; Fig. 3, a sectional elevation on line A of
Fig. 1 Fig. 4, a section on line B of Fig. 3; Fig. 5, a side elevation of the
machine; Fig. 6, a detail view of the cam gear; Figs. 7 and 8, detail views of
the work support used for general grinding purposes; Fig. 9, a detail view of
a portion of the base plate of the holder frame; and Fig. 10, a plan view of
a grinder with a fly-wheel co-operating therewith and attached thereto.
The grinder has a base portion 1 provided with means of attachment to a
bull-wheel or other stationary base, which means comprise preferably a pair of
depending arms 2 having lugs 3. A rod or bar 4 screw-threaded at one end
and having a hook 5 at the other end passes through the base 1. The hook is
adapted to engage under the rim of a bull-wheel or the edge of any other
stationary base, while the lugs 2 engage on the other side of the rim. To clamp
the parts together, a thumb-screw 6 on rod 4 is employed. Figs. 2 and 3
particularly show the attachment of the grinder on the bull-wheel of a harvester,
while Fig. 5 shows the grinder attached to a stationary board or other base 7
having holes 8 to receive the lugs 2 which set into the holes while the hook 5
is adapted to engage over the edge of such board.
From the base rises a standard 9 which provides a bearing for a transverse
main shaft 10 carrying a gear wheel 11 operated by a handle 12. On this shaft
is pivotally mounted an adjustable bell crank shaped frame 13 having substantially
right angled arms 14 and 15, the arm 14 being extended downwardly and the
arm 15 rearwardly. The arm 14 has a slot It to receive the screw-bolt 17
passing through the standard or support 9. The grinding wheel frame comprises
two arms or standards 18 and 19 preferably having a connecting piece 20 and
pivoted at their rear ends upon the shaft 10. The forward ends of these arms
have journals in which is mounted a shaft 21 carrying at its end adjacent to the
gear wheel 11 a small pinion 22 meshing with such gear wheel, whereby the
shaft 21 is rotated by the gear wheel 11. The grinding wheel 23 is adapted to
grind two adjacent cutting edges of a harvester knife and as shown it is, for

page_text: this purpose, beveled from the center outwardly. This wheel is securely fastened
to a sleeve 24 which is removably secured to the rotating shaft 21 by one or
more cotters or pins 25, or the like, passing through registering holes in the
sleeve and shaft, respectively. This construction provides a simple and ready
means of attachment and permits of the removal of one wheel and the insertion
of another by simply removing the cotters and drawing the shaft out towards the
right (Fig. 1). The arm 19 is extended rearwardly beyond its bearing on the
shaft 10 and is bifurcated to form arms 26 and 27.
The arm 15 is provided with a slot to receive the short shaft 28 on which a
gear wheel 29 rotates. This gear wheel has an eccentric or cam 30 contacting
the arms 26 and 27 and causing such arms, and consequently the grinding wheel,
to rock up and down as it is rotated. This gear wheel 29 meshes with a pinion 31
affixed to or made a part of the gear wheel 11 or arranged in any other suitable
way so as to be rotated by such gear wheel 11. A thumb nut 32 clamps the
gear wheel shaft 28 in the in-mesh position or in the out-of-mesh position of its
gear wheel. The extreme end of the arm 15 is bent laterally to form an arm 33
whose inner face has a rib or locating tooth 34 similar to a gear tooth and
adapted to receive and lock the gear wheel 29 and prevent its rotation when out
of mesh. Around the shaft 10 between the standard 9 and the arm 18 is
arranged a sleeve 35 (see Fig. 4), around which is a coiled spring 36 abutting at
one end against a lug 64 on the standard, and at the other end beneath the
cross piece 20 of the grinding wheel frame. The object of this spring is to
carry the weight of this frame and relieve the cam therefrom.
The holder for clamping the work and presenting it to the grinding wheel
comprises a base plate 37 having a slot 38 to receive a screw bolt 39 passing
through the base 1, whereby the plate 37 may be adjusted forwardly and back-
wardly. This base plate has upwardly extending lugs or arms 40 on which is
pivotally mounted the holder frame 41 through means of the depending arms 42
and 43 and the bearing pins 44. The arm 43 is carried below its pivotal point
to form an extended end 45 against which bears an adjusting screw 46 whereby
the pivotal movement of the frame 41 on the plate 37 may be limited.
The holder frame has a pair of rearwardly turned fingers 47 and 48 and one
or more oppositely turned fingers or rests 49. The frame 41 has an arm or
lug 50. having a screw-threaded hole to receive the screw-threaded end of a
clamp 51 which is in fact a combined clamp and a handle inasmuch as it is grasped
by the hand, and after clamping the knife bar, is used to direct and hold the
knife sections against the grinding wheel. The frame 41 has a substantially
horizontal flat portion 52 provided with any desired number of holes located in
different positions and adapted to receive a pin 53, such as an ordinary cotter
pin, against which the knife bar 54 (a portion of which is shown) is caused to
bear when the clamp 51 is screwed inwardly. This knife bar fits between the
fingers 47 and 48 on the one side and the finger 49 and clamp 51 on the
other side.
In Fig. 10 is shown a machine with a co-operating fly-wheel 55 having a
shaft 56 journaled in an extension of the arm 15 and carrying a small pinion 57
meshing with the gear wheel 11. While this fly-wheel may be dispensed with,
its use assurés a smoothness and uniformity of movement, and, furthermore,
the peculiar arrangement of such wheel away from the operating shaft allows
of a high speed to be imparted to such wheel which assists the operator and
facilitates the grinding, besides rendering the motion continuous.
In Figs. 7 and 8 is shown a work support preferably of metal and comprising
a flat portion 58 having depending arms 59 and 60. This support is adapted
to be securely clamped in the same place as the knife bar, and to this end the
arm 59 has a horizontal slot 61 which is received by the finger 49, while the
arm 60 has a screw threaded hole 62 received by the clamp. The flat portion 58
is preferably hollowed out at 63 to accommodate a different size of grinding wheel
used for general grinding.

page_text: Simul-
My machine being constructed as hereinbefore set forth, operates as follows:
The adjustable gear wheel 29 being in mesh and the gear wheel 11 being turned,
the pinion 22 is rotated and the grinding wheel 23 is also rotated.
taneously, the gear 29 is rotated and by reason of the eccentric contacting the
bifurcated end of the grinding wheel frame, such frame is caused to vibrate or
rock up and down so that the grinding wheel as it rotates has a rocking or
vibrating movement in an are of a circle whose center is the shaft 10.
When it is desired to use the machine for ordinary grinding work, or when for
any reason it is desired that the grnding wheel frame shall be stationary, the
thumb nut 32 is loosened and the gear wheel 29 moved backwards, the teeth
engaging the locating tooth 34 on the arm 33, atter which the nut 32 is tightened.
The position of the grinding wheel frame with respect to the standard 9 is
adjustable by virtue of the slotted arm 14 whose adjustable movements are com-
municated to the other arm 15 and thereby to the gear wheel 29 and its cam,
whereby the axis of such gear wheel is raised or lowered. The arc described by
the grinding wheel frame may thus be adjusted higher or lower to suit require-
ments. As this frame descends, the coiled spring is somewhat compressed and
on further movement of the parts the spring tends to raise this frame and relieve
the machine and its operator of a continual lift.
The knife bar is inserted in the holder frame so that the angle or point between
the two adjacent knife sections is in the same vertical plane as the central or
highest point of the grinding wheel as seen in Fig. 2. The clamp 51 is then
screwed inwards and bears against the knife bar. To accommodate a thick or
thin bar or any size of head on a knife bar, the pin 53 may be placed in the
proper hole in the plate 52. The base plate 37 is adjustable to proper position
to or from the wheel according as the knife sections are either long or short,
and is then clamped. The arm 14 is adjustable so that the grinding wheel in
its vibration will grind the entire cutting edge of the sections and the set screw 46
is also adjusted to regulate and limit the forward tipping of the holder frame or
prevent dubbing or rounding off of the sickle sections. After being thus properly
adjusted, perfect work is always assured however inexperienced the operator
may be.
When the machine is used for general grinding purposes, the grinding wheel
frame is arranged not to vibrate by taking the gear 29 out of mesh and such
frame can be adjusted to the desired height or altitude by adjusting the arm 14
on the stationary standard 9, or such gear wheel after being taken out of mesh
may be turned and then locked on the locating tooth. The grinding wheel may
thus be readily adjusted 'to grind low or high or at any intermediate point. If
the gear wheel is taken out of mesh when the eccentric is at a position to
vibrate the frame to its highest altitude the frame will be held high and held
low if such gear wheel was adjusted when the frame was at its lowest position.
The grinding wheel shown may be readily removed in the manner before stated
and the grinding wheel of the desired shape or style substituted.
Having now particularly described and ascertained the nature of this
invention, and in what manner the same is to be performed, I declare that what
I claim is :
1. A grinding machine comprising a grinding wheel, a pivoted frame carrying
the wheel at one end and having an extended portion at the other end beyond
the pivotal point, an eccentric co-operating with such extended portion to vibrate
such frame, a frame carrying such eccentric and adjustable in position to vary
the position of arc of vibration.
2. A grinding device comprising a vibrating grinding wheel frame, a grinding
wheel therein, mechanism for vibrating the frame, a driving wheel operating
said mechanism and simultaneously rotating the grinding wheel and means for
throwing said mechanism out of operation and simultaneously locking said
mechanism.

page_text: 3. A grinding device comprising a base portion or support having a journal,
a inain shaft in such journal, a rotatable grinding wheel, a frame pivoted on
said shaft, carrying at one end the grinding wheel and having an extension at
the other end beyond its pivotal point,, an eccentric contacting such extension
to vibrate the frame and the grinding wheel, a gear actuating the eccentric, a
main driving gear wheel rotating the grinding wheel and having a pinion meshing
with the eccentric actuating gear.
4. A grinding machine comprising a base portion or support, a main shaft
mounted therein, a rotatable grinding wheel, a frame pivoted on said shaft,
carrying at one end the grinding wheel and having a bifurcated arm extending
beyond its pivotal point, an eccentric located between the bifurcations of said
arm and adapted to vibrate the frame, a gear wheel actuating said eccentric;
and a main driving gear wheel arranged on the main shaft, and adapted to
rotate the grinding wheel and having a pinion to actuate the eccentric actuating
gear wheel,
'
5. A grinding machine comprising a standard or support, a main shaft mounted
therein, a rotatable grinding wheel, a frame pivoted on said shaft, carrying at
one end the grinding wheel and having a bifurcated arm extending beyond its
pivotal point, an eccentric located between the bifurcations of said arm and
adapted to vibrate the frame, a gear wheel actuating said eccentric, means for
removing it from mesh from its driving pinion to prevent vibration of the frame
and a main driving gear wheel adapted to rotate the grinding wheel and having
a pinion to actuate the eccentric actuating gear wheel.
6. A grinding machine comprising a standard or support, a main shaft mounted
in said standard, a grinding wheel, a frame pivoted on the shaft and carrying
the grinding wheel at one end and having an extension on its opposite end beyond
its pivotal point, a bell crank shaped lever pivoted on the main shaft, one arm
being substantially horizontal and projecting parallel to said extension of the
frame, such arm having a longitudinal slot, a shaft adjustable in said slot, an
eccentric mounted on such shaft and a driving wheel for simultaneously rotating
the grinding wheel and the eccentric to vibrate, the frame.
7. A grinding machine comprising a standard or support, a main shaft mounted
therein, a grinding wheel, a frame pivoted on the shaft and carrying the grinding
wheel at one end and having an extension on its opposite end beyond its pivotal
point, a bell crank shaped frame pivoted on said shaft and adjustable with
respect to the standard, an eccentric journaled in one of the arms of the bell
crank shaped frame and adapted to contact said extension of the grinding wheel
frame to vibrate the same and means for rotating the grinding wheel and for
rotating the eccentric to vibrate the grinding wheel frame.
8. A grinding machine comprising a standard or support, a main shaft mounted
therein, a rotatable grinding wheel, a frame pivoted on the shaft and carrying
the grinding wheel at one end and having an extension on its opposite end beyond
its pivotal point, a bell crank shaped frame pivoted on said shaft and having
one of the arms thereof projecting downward adjacent to said standard and
provided with a slot, a clamping bolt passing through the standard and received
by said slot to hold said bell crank shaped frame in adjusted positions, the other
arm thereof extending rearwardly substantially horizontal and provided with
a slot, a shaft adjustable in said last named slot, a gear wheel provided with an
eccentric and mounted on said last named shaft, such eccentric contacting said
extension of the grinding wheel frame, a main driving gear rotating the grinding
wheel, and a pinion intermediate such driving gear wheel and the eccentric-
provided gear wheel.
9. A grinding machine comprising a standard or support, a main shaft mounted
therein, a rotatable grinding wheel, a frame pivoted on the shaft and carrying
the grinding wheel at one end and having a bifurcated extension on its opposite
end beyond its pivotal point, an arm mounted on said shaft and extending rear-
wardly, a gear wheel, an eccentric thereon embraced by said bifurcated extension

page_text: to vibrate the grinding wheel frame, a shaft for said gear wheel and adjustably
mounted in said arm, a driving wheel rotating the grinding wheel and having a
pinion meshing with said gear wheel and a projection on said arm to engage in
and lock said gear wheel when adjusted out of mesh.
10. A grinding machine comprising a base, a vibrating grinding wheel frame
mounted thereon and having a bifurcated extension, an eccentric embraced by
such extension and having a shaft, a bracket arranged on the base and having a
slot in which the shaft is adjustably secured, driving mechanism for operating
said eccentric, and a lug or tooth on said bracket adapted to engage the eccentric
when adjusted out of operation with the driving mechanism, whereby the eccentric
is held in different positions to adjust and hold the frame from vibrating and at
different altitudes.
11. A grinding machine comprising a standard or support, a main shaft mounted
therein, a rotatable grinding wheel, a frame pivoted on the shaft and carrying
the grinding wheel at one end and having a bifurcated extension, an arm extending
rearwardly from said shaft and having its extreme end turned at an angle and
there provided with a rib or lug, a shaft or spindle adjustably mounted on said
arm, a gear wheel mounted on said spindle, an eccentric thereon embraced by
said bifurcated extension, and a driving wheel rotating the grinding wheel and
having a pinion meshing with said gear wheel to rotate the same and cause the
eccentric to rock the grinding wheel frame.
12. A grinding machine comprising a base, a grinding wheel rotatably sup-
ported thereon, means for rotating such wheel, and means for presenting the work
to the wheel, which means consist of a frame pivoted on said base and having
fingers or rests and a combined handle and clamp substantially as shown screwing
into the frame to clamp the work between said fingers.
13. A grinding machine comprising a vibrating grinding wheel frame, a
rotatable grinding wheel therein, an eccentric for vibrating said frame, mechanism
for rotating the eccentric and means substantially as shown whereby the eccentric
may be shifted out of operation and locked in different positions to simultaneously
hold the frame stationary and at different altitudes.
14. In a grinding machine, the combination of a supporting frame, a driver,
a journal pivoted on the frame, a fly wheel mounted therein and driven by such
driver, such journal and fly wheel being adjustable with respect to the driver and
in the arc of a circle with the frame as a center.
15. A sickle grinder constructed and operating substantially as herein shown
and described.
Dotal thin 1541 Ja
1
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.