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Патент USA US2121965

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June 28, 1938.
2,121,965
c. D..HlMEBA-UGH '
LAWN MOWER SHARPENER
Filed May 6, 1955
I
'
‘6% -
_
INVENTOR
ATZgTqEYS
Patented June 28:, 19.38"
’ 2,121,965
PATENT OFFICE "
2,121,965
LAWN MOWER sHARrnNER.
Application
Clayton D.May
Himebaugh,
6, 1935, BurrOak,
‘Serial No. 19,999
(Cl; 51-2516)
14 Claims.
The main objects of this‘ invention are:
Eirst,_to provide a sharpening device which is
especially well adapted for effectively sharpening
the revolving knives of conventional lawn mow
, Second, ‘to provide a sharpening device of the
foregoing character which ‘is simple and eco
nomical‘in its ‘parts, easy to manipulate and
‘
’
‘
cutter ‘bar 2 by means of coiled tension springs
54 connected to the corresponding jaws 8 of the
jaw members, theouter ends of the springs being
provided with hooks 15 for engaging the rod l2
' ,‘Obj‘ects'i'elatingto details andeconomies of my
with the springs‘resiliently embracing the cutter
bar near the ends thereof. For adjusting the
follow. The invention is‘de?n'e'd and pointed out
angle of the members llland II relative to the . .
claims.
‘
‘
'
'
cutter bar and about the ?rst rod 1 asan axis,>I
'
‘ A structure ‘which is a ‘preferred embodiment
of my invention“ is illustrated in the accom
panying drawing, in :which:
provide ‘screws 16 threaded to the end‘members, _
the inner ends of the screws abutting the cutter 15,
bar 2 as best shown by Fig. 3. The springs H! ex
in cross section and showing the sharpening de
pand and contract vto permit the angle to be
changed without affecting the relatively ?xed
position of'the rod 1 with respect to the cutter
bar '2'. This adjustment is desirable to take care
of various differences in the diameter of the
vice‘ in operation;
rotors of lawn mowers ‘now on the market.
,1 is a fragmentary perspective View of a.
lawn mower in invertedip'osition" with my sharp
ening ‘device associated therewith.
, Fig; '2 is an enlarged fragmentary view mainly
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'
Fig. .3‘is'a fragmentary view of the sharpener
Fig.‘ 4 is a fragmentary top plan view of my
sharp'enin'gldev'ice.
)
"
5 isgan enlargedffragmentary view in‘ per
spective showing the relation between the rods
an'dthe hone carriage‘. '
'
6 is _a viewzin side elevationof one of the
jaw" members.‘
_' ‘
_
'
Referring to'the] drawing, l in general is a
conventional lawn mower in inverted ‘position,
preferably standing 'on ‘its handle, 'the lawn
mower comprising the usual" cutter bar 2 and
rotary knives ,3, the latter being adaptedto'coact
with a stationary shear bar or blade 4 on the
cutter bar 12. Lawn mowers of this’type are well
known and therefore require no further descrip
tion here. '
A hone carriage I1 is pivoted to the rod 12 at I8
and. 'is adapted to slidably reston the rod 1 .for
assembly in end “elevation.
30
"
invention'will I. appear fromfthe description to
in‘the
25
pins l3 extending through holes in the member
and rods.‘
The jaw members 5 are held in place on the ‘
a- ers ‘without *removingthem from the machine. -
veryve?icient and effective in operation.
to lawn mowers of various widths. The member
i0 "is preferably held in place by means ofcotter
_
'
sliding movement longitudinally of both rods. 25
The carriage has a channel-like seat [9 extend
ing transversely of therods for receiving a hone
2!] preferably of c'arborundum, the hone project
ing from'the channel for sharpening therotary
knives 3 as the carriage is moved forward and
backward'and ,the rotary knives are revolved.
The bone carriage I9 ,is preferably made of
sheet metal, the Web 2| of the channel being pro
vided with a downturned piece 22 engaging‘the
rod ,1. The 'sides of the channel releasablyengage
the hone '20 so that the hone may be readily
assembled'with and adjusted relative to the car
r'ia‘ge.
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.
v
The lawn mower l .to be sharpened .is prefer
ably’fn'fst inverted as shown by Fig. 1 or stood on
In the illustrated embodiment of my invention, its handle and inclined relative to a wall. The
the ‘sharpening device comprises a‘pair of jaw . sharpening deviceisthen assembled with the cut-‘
members 5having‘alined1holes 6 through which ter bar ‘2‘as 'po‘inted'out above in connection with '
is disposed alrelatively ?xed slide rod 1. On the the elements of the device. After the various
adjustments have been made, the rotary knives
45‘ corresponding jaws8' of the jaw members, I pro
vide adjustable cams}! for changing the effective safe revolved in a direction opposite to their nor
mal movement andthe carriage I‘! at the same
opening between the jaws thereof, the jaw mem
bers being ‘thus? adapted to engage cutter bars of
various widths near the ends thereof.
v50
K
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‘A pair of link-like" brackets or end members It
time is moved slowly back and forth onthe rods
1 and l2’. This action: quickly sharpens the rotary
blades 3, after which the sharpening device is
and H are associated with the rod 1 to hold a
readily ‘removed from the lawn mower by simply
second slide rod 12 in spaced parallel relation
releasing'the' hooks l5'from the rod l2.v
From- the foregoing description of my inven
to the rodyl, theimemb'er' l>ll<being ?xed to the
rods and the member ll being'slidable longitudi tionfit willlb‘ezap-p'arent to those skilled in the
5'5“ nally‘v of the rods toirende'r the device adaptable art th'atI} provide a lawn mower sharpening de
2
2,121,965
vice which is simple and economical in its parts
and very ef?cient and effective for the purpose
?tting said carriage and projecting therefrom for
sharpening the rotary knives as the carriage is
intended. ‘ The device is adjustable to take care
moved back and forth and the rotary knives are
of conventional lawn mowers of various sizes
revolved.
although being very simple and economical in its
parts. The longitudinal movement of the hone
coupled with the transverse movement due to the
revolving of the rotary knives greatly facilitates
3. A sharpening device for lawn mowers having
rotary knives and a cutter bar, comprising a pair
of supporting jaw members adapted to engage
the cutter bar near the ends thereof and having
alined holes, a ?rst rod disposed through said
the sharpening action of the device and leaves a
10 highly desirable cutting edge on each rotary knife
for coaction with the stationary blade or knife in
the normal use of the mower.
I have illustrated and described my improve
ments in an embodiment which I have found very
15 practical. I have not attempted to illustrate or
describe other embodiments or adaptations as it
is believed this disclosure will enable those skilled
in the art to embody or adapt my improvements
as may be desired.
Although I have shown and described a certain
speci?c embodiment of my invention, I am fully
aware that many modi?cations thereof are pos
sible. My invention is therefore not to be re
stricted except insofar as is necessitated by the
25 prior art and by the spirit of the appended claims.
Having thus described my invention, what I
claim as new and desire to secure by Letters Pat
ent, is:
1. A sharpening device for lawn mowers having
rotary knives and a cutter bar, comprising a pair
of jaw supporting members adapted to engage
the cutter bar near the ends thereof and having
alined holes, adjustable cams on corresponding
jaws of said jaw members for changing the effec
tive opening between the jaws thereof, a ?rst rod
disposed through said holes, a pair of end mem
bers on said ?rst rod, a second rod held by said
end members in‘ spaced parallel relation to said
?rst rod, one of said end members being ?xed and
the other slidable longitudinally relative to said
rods, coiled tension springs connected to corre
sponding jaws of said jaw members, hooks on
the outer ends of said springs for engaging said
second rod- with the springs embracing the cutter
bar, screws threaded to said end members for
adjusting the angle of the end members relative
to the cutter bar and about said ?rst rod as an
axis, a hone carriage pivoted to said second rod
and resting on said ?rst rod for sliding movement
longitudinally of both ends, the carriage having
a channel-like hone seat extending transversely
of said rods, and a hone removably ?tting said seat
and projecting therefrom for sharpening the ro
tary knives as. the carriage is moved back and
55 forth and the rotary knives are revolved.
2. A sharpening device for lawn mowers having
rotary knives and a cutter bar, comprising a pair
of jaw supporting members adapted to engage
the cutter bar near the ends thereof and having
alined holes, means operatively associated with
said jaw members for changing the effective open
ing between the jaws thereof, a ?rst rod disposed
through said holes, a pair of end members on said
?rst rod, 2. second rod held by said end members
65 in spaced parallel relation to said ?rst rod, coiled
tension springs connected to corresponding jaws
of said jaw members, hooks on the outer ends of
said springs for engaging said second rod with the
springs embracing the cutter bar, means opera
tively associated with said end members for ad
justing the angle of the end members relative to
the cutter bar and about said ?rst rod as an axis,
a hone carriage pivoted to said second rod and
resting on ‘said ?rst rod for sliding movement
75. longitudinally of both ends, and a hone removably
_
holes, a pair of end members on said ?rst rod, 10
a second rod held by said end members in spaced
parallel relation to said ?rst rod, coiled tension
springs connected to corresponding jaws of said
jaw members, hooks on the outer ends of said
springs for engaging said second rod with the
springs embracing the cutter bar, screws threaded
to said end member for adjusting the angle of the
end members relative to the cutter bar and about
said ?rst rod as an axis, a hone carriage pivoted
to said second rod and resting on said ?rst rod
for sliding movement longitudinally of both rods,
the carriage having a seat extending transversely
of said rods, and a hone ?tting said seat and pro
jecting therefrom for sharpening the rotary
knives as the carriage is moved back and forth 25
and the rotary knives are revolved.
4. A sharpening device for lawn mowers having
rotary knives and a cutter bar, comprising a pair
of supporting jaw members adapted to engage the
cutter bar near the ends thereof and having alined 30
holes, a. ?rst rod disposed through said holes,
a pair of end membersv on said ?rst rod, a
second rod held by said end members in spaced
parallel relation to said ?rst rod, springs con
nected to corresponding jaws of said jaw mem
bers, hooks on the outer ends of said springs for
engaging said second rod with the springs em
bracing, the cutter bar, screws threaded to said
end members for adjusting the angle of the end
members relative to the cutter bar and about said
?rst rod as an axis, and a hone carriage pivoted
to said second rod and resting on said ?rst rod for
sliding movement longitudinally of both rods.
5. A sharpening device for lawn mowers having
rotary knives and a cutter bar, comprising a pair 45
of supporting jaw members adapted to engage the.
cutter bar near the ends thereof and having alined
holes, a ?rst rod disposed through said holes, a
pair of end members on said ?rst rod, a second
rod held by said end members in spaced parallel 50
relation to said ?rst rod, springs connected to
corresponding jaws of said jaw members, hooks
on the outer ends of said springs for engaging
said second rod with the springs embracing the
cutter bar, means for adjusting the angle of the 55
end members relative to the cutter bar and about
said ?rst rod as an axis, and a hone carriage piv
oted to said second rod and resting on said ?rst
rod for sliding movement longitudinally of both
rods.
60
6. A sharpening device for lawn mowers having
rotary knives and a cutter bar, comprising a pair
of supporting jaw members adapted to engage the
cutter bar near the ends thereof and having alined
holes, adjustable cams on corresponding jaws of 65
said jaw members for changing the e?ective
opening between the jaws thereof, a ?rst rod dis
posed through said holes, a pair of end members
on said ?rst rod, a second rod held by said end
members in spaced parallel relation to said ?rst
rod, one of said end members being ?xed and
the other slidable longitudinally relative to said
rods, coiled tension springs connected to corre
sponding jawsof said jaw members, hooks on the
outer ends of said springs for engaging said sec 75
3
2,121,965
ond rod with the springs embracing the cutter
bar, means threaded to said end member for ad
justing the angle of the’end members relative to
the cutter bar and about said ?rst red as an axis,
a hone carriage mounted for sliding movement
longitudinally of both rods, the carriage having
sliding movement longitudinally of both rods, the
carriage having a seat extendingtransversely of
said rods, and a hone ?tting said seat and pro
jecting therefrom for sharpening the rotary
knives as the carriage is moved back and forth 5
and the rotary knives are revolved.
'
1
10.' A sharpening device for lawn mowers have
a seat extending transversely of said rods, and a
hone ?tting said seat and projecting therefrom ing rotary knives and a cutter bar, comprising a '
for sharpening the rotary knives as the carriage pair of supporting jaw members adapted to en
10 is moved back and forth and the rotary knives are gage the cutter bar near the endsfthereof and
having alined holes, adjustable cams on corre
revolved.
.
7. A sharpening device for lawn mowers having sponding jaws of said jaw members for changing
rotary knives and a cutter bar, comprising a pair the effective opening between the jaws thereof, a
of supporting jaw members adapted to engage ?rst rod disposed through said holes, a pair of
15 the cutterjbar near the ends thereof and having end members on said ?rst rod,-a second rod held 15
alined holes, adjustable cams on corresponding ‘ by said end members in spaced parallel relation
to said ?rst rod, springs connected to correspond
jaws of said jaw members for changing the ef
fective opening ‘between the jaws thereof, a first ing, jaws of said jaw members and having means
rod disposed through said holes, a pair of end for engaging said second rod with the springs em
V20 members on said ?rst rod, a second rod held by bracing. the cutter-bar, and, a hone carriage 20'
said end members in spaced parallel relation to mounted for sliding movement longitudinally of
said ?rst rod, one of said end members being
?xed and the other slidable longitudinally rela
tive to said rods, coiled tension springs connected
to corresponding jaws of said jaw members, hooks
on the outer ends of said'springs for engaging
said second rod with the springs embracing the
cutter bar, a hone carriage mounted for sliding
movement longitudinally of both rods, the car
30 riagehaving a seat extending transversely of
said rods, and a hone ?tting said seat and'pro
jecting therefrom for sharpening the rotary
knives as the carriage is moved back and forth
both rods.
'
‘
11. A sharpening device for lawn mowers hav~
ing rotary knives and a cutter bar, comprising
a' pair of supporting jaw members adapted to 25
engage the cutter bar near the ends thereof and
having alined holes, a ?rst rod- disposed through
said holes, a pair of end members on said ?rst
rod, a second rod held- by said end members in
spaced parallel relation to said ?rst rod, springs
connected to corresponding jaws of said jawv
members and havingmeans for engaging‘said
second rod with the springs embracing the cutter
and the rotary knives are revolved.
bar, and a hone carriage mounted for sliding
8. A sharpening device for lawn mowers having
rotary knives and a cutter bar, comprising a pair
of supporting jaw members adapted to engage
the cutter bar near the ends thereof and having
movement longitudinally of both rods.
" 35
12. A sharpening device for lawn mowers come ,
alined holes, adjustable cams on corresponding
40 jaws of said jaw members ‘for changing the effec
tive opening between the jaws thereof, a ?rst rod
disposed through said holes,,a pair of end mem
bersv on said ?rst rod, a second rod held by said
prising supporting members provided with v‘
jaws adapted to engage a cutter .bar, a slide rod " "
on said supporting members projecting through
the same, a second slide rod, link-like supporting
brackets for said second rod mounted on the .
‘projecting ends of ‘said ?rst slide rod, a hone
carriage slidable on said rods, adjusting screws”
end members in spaced parallel ‘relation to said ' for saidbrackets, and spring tie members con
nected to said supporting'members and adapted
?rst rod, coiled tension springs connected to cor
responding jaws of said jaw members,~hooks on ‘ to be disposed around'the cutter bar and provided
the outer ends of said springs for engaging said with hooks detachably engageable with the sec-f
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1
second rod with the springs embracing the cutter ‘ ond slide rod.
'13. A sharpening device for lawn ‘mowers com~
bar, a hone carriagemounted for sliding move
ment longitudinally of both rods, the carriage prisingsupporting members adapted to engage a
having a seat extending transversely of said rods, cutter bar, a slide rod on said supporting mem- _50 F
and a hone ?tting said seat and projecting there— - bers, a second slide rod, supporting brackets for
_ > ‘from for sharpening the rotary knives as the car- .
' riage is moved back and forth and the rotary
knives are revolved.
- '
9. A sharpening device for lawn mowers having
rotary knives and a cutter bar, comprising a pair
of supporting members adapted to engage the
cutter bar near the ends thereof and having"
alined holes, adjustable cams on corresponding
jaws of said jaw members for changing the e?ec
tive opening between the jaws thereof, a ?rst rod
disposed through said holes, a pair of end mem
bers on said ?rst rod, a second rod held by said
end members in spaced parallel relation to said
said second rod mounted on the said ?rst slide
rod, a hone carriage slidable on said rods, and
adjusting screws for said
brackets. .
"
.
1155
14. A sharpening device for lawn mowers :com- -
prising supporting members provided with‘ V—.
jaws adapted to engage a cutter bar, a slide rod
on said supporting members projecting, through '
’ the same, a second ‘slide rod, link-like supporting '
brackets for said second rod mounted on the .
projecting ends of said ?rst slide rod, ahone
carriage slidable on said rods, and spring tie
members connected to said supporting members‘
I‘
andadapted to be disposed around, the cutter bar
65‘ '
?rst rod, springs connected to corresponding jaws
and provided with hooks detachably- engageable
of said jaw members and having means for en
with the second slide rod.
gaging said second rod with the springs embrac
ing the cutter bar, a hone carriage mounted for
60.
‘
CLAYTON D. HI‘MEBAUGI-VI.
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