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Nov. l2, 1946. -
A._ R. LoFsTRAND, JR
l2,410,828
CHAIN SAW _SHARPENERl
Filed Nov. 19, 1943
4 Sheets-Sheet 1
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N0V~ l2, 1946.
A. R. LoFsTRANb, JR
2,410,828
CHAIN SAW SHARPENER
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Filed NOV. 19, 1943
-4 "sheets-smeetv 2
NOV- l2, 1946-
A. R. LOFSTRAND, JR
2,410,828
CHAIÑ sAw SHARPENER
Filed Nov. 19, 1943
' 4 Sheets-Sheet 3
427.
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if
Nov. l2, 1946.
A. Rl. I_OFSTRAND,` JR
2,410,828
CHA-IN SAW SHARlA’ENER
Filed NOV. 19, 1943
4 Sheets-Sheet
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46
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Patentecl Nov. 12, 1946
2,410,828
-UNITED STATES PATENT OFFICE
2,410,828
CHAliN SAW SHARPENER
Anders R. Lofstrand, Jr., Silver Spring, Md.
Application November 19, 1943, Serial No. 510,948
5 Ciaims. (Cl. 51--92)
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This invention relates to a sharpening device
for sharpening chain saws.
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gauge or index for determining one angular posi
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tion of the carriage.
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Referring to the drawings, the numeral l5 des
saw lSharpener wherein the work is clamped on a
ignates generally a frame structure which in
vertically movable support, the support being ad 5 cludes an upright frame Vmember lâ having
formed integral with the upper end thereof Aan
justable to varying angles so that all of the teeth
angularly extending table ll. A rearwardly ex
of the saw may be cut at the desired or proper
tending stationary- clamp i3 extends from the
angle.
.
rear side of the vertical member it and an ad
Another obj ect of this invention is to provide a
justable threaded clamping memberl 19 is
chain saw Sharpener which is portable, being
threaded through a rearwardly extending arm 26
capable of being clamped onto any suitable supcarried by the lower portion of the vertical frame
port, and which may be operated by means lof an
An object of this invention is to provide a chain
air motor, an electric motor, an internal com
member I6 so that the frame l5 may .be clamped
bustion engine, or any suitable and available
15
power device.
onto a support S.
A further object of this invention is to provide
a device of this kind which can be accurately set
in right-angularly related planes so that the de
sired cutting angle may be formed on the teeth
of the saw.
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The table or plate Il is adapted `to have se
cured to the upper side thereof a spindle or
grinder shaft 2l.
In the present instance, the
grinder shaft vill is formed as part of an air motor
22 which is bolted to the upper side of the sup~
porting plate or table Il.A Where an electric mo
tor is used, the spindle 2l may be journaled in a
bearing secured to the table l1 and the same is
true where the spindle 2l is rotated by means
of an internal combustion engine or other suit
A further object of this invention is to provide
an improved clamp for clamping the chain saw
in proper position for grinding the teeth thereof.
With the foregoing objects and others whichl
able power device.
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may hereinafter appear, the invention consists of 25
The- air motor 22 includes a spring-pressed nor-'
the novel construction, combination and arrange
mally closed valve 23 which is adapted to be movedment of parts as will be more specifically referred
into open 'position by means of a horizontally
to and illustrated in the accompanying draw
ings, wherein is shown an embodiment of the 30 swingable lever 24 provided with a cam‘member
25 engageable with the valve member 23 when
invention, but it is to be understood that changes,
the
lever 24 is rotated or swung in a counter
modifications and variations may be resorted to
clockwise direction. An abrasive wheel 2t is se
which fall within the scope of the invention as
curedto the spindle or drive shaft 2l and the
claimed.
In the drawings:
-
» Figure 1 is a detail front elevation partly in sec
tion of a chain saw Sharpener embodying this
invention,
Figure 2 is a top plan partly broken away and in
section of the device,
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Figure 3 is a detail side elevation of the device,
Figure 4 is a detail side elevation partly in vern
wheel 26 has mounted thereabout a guard or
shield 21; The guard or shield y2l is carried'by a
cylindrical clamp 23 having rearwardly extend
ing ears 29 which are drawn together by means
of a pressure bolt 29a so that the guard or shield
21 may be disposed in the proper position. VThe
40 guard or shield 2l is positioned to expose the
wheel 25 on the lower side thereof so that the
teeth of Va chain saw mounted on a vertically
tical section of the device on the side opposite l
movable carriage may be properly sharpened.
from that shown in Figure 3,
y
. The frame l5 includes a forwardly extending
Figure 5 is a fragmentary sectional View taken 45 arm 30 at the lower end of the vertical frame
on the line 5_5 of Figure 1,
membei` 16 and a cylindrical guide 3l is carried
VVFigure 6 is a sectional View taken on the line
6-3 of Figure 1,
. ,
by the forward end of the arm 39. The guide
3l at the upper end thereof has formed integral
` Figure 7 is a sectional View taken- on the line
therewith an annular plate 32 and the plate 32
Y
50 constitutes a limit means for limiting the down
1--1 of Figure 1,
Figure 8 is a fragmentary sectional view
taken
on the line 8-8 of Figure 3,v
Figure 9 is a sectional View taken on the line
ward movement of a saw carriage, generally des
ignated as 33.
The carriage 33 includes a vertically slidable
9`-“`--f9,of Figure 3, and
shaftßt which is slidable in the bore 35 of the
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Figure lll-is a-'fragmentaryr plan viewo'f the 55 bushing or guide 3|. An annular plate 36 is se
2,410,828
4
3
larly adjusted position by means of a thumb nut
69 which is threaded on a bolt 18. The bolt 10
extends through an arcuate slot 1| formed in the
cured by means of a bolt or cap screw 31 at the
upper end of the shaft 34, and preferably, the
plate 36 is formed with a socket or downwardly
opening recess 38 within which the upper end of
the shaft 34 is adapted to engage. The shaft 34
adjacent the upper end thereof is formed with
an annular groove39, and a half-circular clamp
~ vertical plate 68 and a spacer sleeve 12 is inter
posed between the forward side of the plate 60
and the rear side of the clamping plate 65. A
pointer 13 is secured to the rear side of the clamp
ing collar 40 engages in the groove 39. A pressure
screw 4| is threaded in an opening, 42 provided
ing plate 65 and is adapted to move over an arcu
ate gauge plate 14 which is secured to an arcu
tending vertically disposed plate Y68 which is
formed integral with the plate 36, The vertical
clined inner sides 94 and 96 are disposed in con
vergent relation towards the right as viewed in
plate 6D constitutes a clamp support and extends
laterally from the plate 36, as shown in Figure 1.
Figure 2.
in the plate 36 and the screw 4| is formed with 10 ate ñange 15 carried by the plate 66 atits outer
or left end. The chain saw C is formed with
a reduced inner end 43 engaging in an opening
sprocket engaging lugs 16 which are adapted
44 formed in the central portion of the clamping
collar 40. The screw 4| at the outer end thereof l to be disposed between the two plates 64 and 65
and the links 11 of the saw are adapted to rest
is provided with a handle 45 so that when it is
desired to rotatably adjust the plate or table 36 on 15 on the upper edges 61 and 68 of the clamping
member 6|. The lugs 16 are locked between the
the upper end of the shaft 34, the screw 4| may
plates 64 and 65 by means of a pressure screw 18
be loosened and the desired adjustment made sovv
which extends loosely through the front plate 64
as to angularly position the saw in the desired
and is threaded into the rear` plate 65. The
angular relation with respect to the abrading
whee126.
20 screw 18 includes an angularly disposed handle
19 by means of which the screw 18 may be tight
'I'he carriage 33 is adapted to Ibe manually
ened or loosened.
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raised to an operative position for bringing the
A selected tooth T of the chain saw is adapted
teeth of the chain saw into engagement with the
to be disposed in the proper position'for sharpen
abrading wheel by means of a rock lever 46. The
rock lever 46 is pivotally mounted on a pivot mem 25 ing by the wheel 26 by means of a slide struc
ture 88 which is carried by the clamping member
ber 41 carried by the lower portion of the frame
6|. The slide structure 88 includes a sliding
member I6, and the shaft 34 has extending lat
plate 8| disposed between the clamping members
erally therefrom a pin 48 which is secured to the
64 and 65 and slidably engaging the upper edge
shaft 34 by means of a bolt or cap screw 49. The
pin 48 as shown in Figure 8 is formed with a 30 of the spacer member 66. The two plates 64 and
65 are provided with elongated openings 82 and
sleeve 58 which slidably engages in an elongated
83, respectively, and the slide plate 8| is also
slot 5| formed in the handle or lever 46 between
formed with a vertical slot 84. A threaded shaft
the ends thereof. The bushing, or guide 3| is also
85 is secured in outwardly or forwardly extended
formed with a vertical slot 52 within which the
pin 48 slidably engages so that the shaft or slide 35 position with respect to the forward plate 64,
being supported on a pair of forwardly extending
34 will be held against rotation but will be per
ears 86 which are struck from the forward plate
mitted vertical sliding movement.l The shaft 34
64. A circular nut 81 is threaded on the relatively
is limited in its upward movement by means of
stationary shaft 85 and is adapted to engage in
a reduced diameter downwardly extending
threaded stud 53 which is carried by the lower 40 the slot 84 of the slide plate 8|. Movement of
the nut 81 lengthwise of the shaft 85 will move
end of the shaft 34, and an adjustable nut 54 is
the slide plate 8| between the plates 64 and 65
threaded onto the stud 53~ A lock nut 55 is also
and lengthwise of the clamping member 6|.
threaded on the stud 53 and is adapted to lock
The 'slide plate 8| has secured thereto a pair of
the adjusting nut 54 in the desired position.
A cotter pin 56 or the like is extended through a upwardly extending resilient fingers 88 and 89
which are secured at their lower ends to blocks
the lower portion of the stud 53 so that the two
96 and 9|, respectively, by fastening members 92.
nuts 54 and 55 cannot `be unthreaded from the
The blocks 98 and 9| are secured on opposite sides
stud 53 during normal use of the device. The
of the slide member 8| and the resilient fingers 88
upper side of the plate 35 has secured thereto
and 89 extend upwardly above the clamping mem
an arcuate gauge plate 51 and a pointer 58 is in
bers 64 and 65. The finger 88 has secured to the
terposed between the Ibolt or cap screw 31'and
upper end thereof and on the rear side a block 93
the upper side of the plate 36, there preferably
which is formed with an inclined'inner face 94.
being a washer 59 between the pointer 58 and
The upper end of the rear resilient finger 89 has
the plate 36 so that the pointer 58 will overlie the
secured to the upper end thereof a block 95
gauge member 51.
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formed with an inclined inner side 96 and the in
The carriage 33 also includes an upwardly ex
A clamping structure, generally designated as 6|,
is pivotally secured on a, pivot member 62 which
extends through a bushing or boss 63 carriedby
the plate or support 68. The clamp structure 6|
includes a pair of clamping plates 64 and 65 which 65
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The blocks 93 and 95 are adapted to engage the
opposite sides of the chain saw C so as to hold the
saw against tilting and to coact with the clamp
ing plates 64 and 65 in firmly holding the saw in
a proper position for sharpening of a selected
tooth.
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In the use and operation of this Sharpener, the
frame I5 is secured to the desired support S and
the motor 22 is connected to a suitable source of
adjacent the lower portion thereof. The clamp~
air pressure supply so that the wheel 26 will be
ing structure 6| is adapted to be vertically Vrocked
on the pivot member 62 for adjusting the upper 70 rotated when the valve member 23 is moved to an
open position. The chain saw C‘ is mounted on
saw supporting edges 61 and 68 of the plates 64
the clamping member or structure 6| with the
and 65 in order to provide for angularly grind
are disposed in spaced relation, there being a
spacer plate 66 between the plates 64 and 65>
ing the teeth of the chain saw C which is clamped
in the clamping member 6|.
rl‘he clamp structure 6|4 is'locked
lugs 16 engaging betweenthe plates 64 and 65 and
the links 11 of the saw resting on the upper edges
its angu 75 of the plates 64 and 65. The’opposite ends of the
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2,410,828
plates 64 and 65 are preferably curved, as indi
cated at 91, so that the chain saw can depend
from the clamping structure 6l, as shown in Fig
ure 1.
6
plates on said carriage, means holding said plates
in adjusted position, a pair of opposed resilient
saw gripping fingers, a slide secured ‘to said iin
gers and movable lengthwise of said plates, and
The carriage 33 is angularly adjusted about the
means adjusting said slide lengthwise of said
vertical aXis of the shaft 34 by loosening the
plates, including cooperating screw and adjust
clamping collar ¿lil after which the clamping seg
able nut.
ment 4l) may be tightened so as. to firmly hold the
2. A chain saw Sharpener comprising a frame,
plate 36 against movement relative to the shaft
a grinding wheel rotatably carried by said frame,
34. The clamping structure 6l may be vertically 10 a vertically shiftable carriage carried by said
adjusted on the horizontal pivot 62 by loosening
frame, a pair of saw clamping plates disposed in
the nut 69 and swinging the clamping structure to
a vertical position, means pivotally mounting said
the desired position, as shown by the pointer 13
plates on said carriage, means holding said plates
and the gauge 'F4'.
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in adjusted position, a pair of opposed saw grip
Before the clamping screw ‘i8 is tightened, the 15 ping fingers extending above said plates, and
saw adjusting nut 81 is adjusted lengthwise of the
means slidably mounting said fingers for adjust
shaft 85 so that the proper tooth of the saW is in
ment lengthwise of said plate.
the proper position for grinding ofthe cutting
3. A chain saw Sharpener comprising a frame,
edge thereof. When the saw has been adjusted
a grinding wheel rotatably carried by said frame,
lengthwise of the clamping vstructure 6|, the
a vertically shiftable carriage carried by said
clamping screw 18 may be tightened by the handle
frame, a pair of saw clamping plates disposed in
'I9 so that the chain saw Will be held against
a vertical position, means pivotally mounting said
movement with respect to the clamping structure
plates on said carriage, means holding said plates
6I.
in adjusted position, a pair of opposed resilient
The carriage shifting handle or lever 46 may 25 saw gripping fingers, a slide secured to said fin
then be raised thereby bringing the selected tooth
gers and movable lengthwise of said plates, and
into engagement with the abrasive wheel 26.
means adjusting said slide lengthwise of said
plates.
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The upward limit of movement of the carriage 33
is adjusted by adjusting the limit nut 5d which is
4. In a chain saw Sharpener, a movable car
then locked by the lock nut 55. Having once 30 riage, a pair of saw clamping plates carried by
made the proper adjustments of the carriage 33
said carriage, a pair of opposed saw gripping fin
and the clamping structure 6I, the desired teeth
of the saw can be ground, it being understood that
the chain saw C includes right and left cutting
teeth and a central raker tooth so that the angu
lar adjustment of the carriage 33 and of the
clamping structure 6| will be made for the cut
gers disposed partially above said plates, said
plates being formed with elongated guide slots, a
slide loosely engaging in said slots, means secur
ing said lingers to said slide for movement there
with, means for simultaneously locking said slide
and clamping said plates on opposite sides of the
saw, and means for adjusting said slide length
adjusted for the cutting teeth on the other side
wise 0f said slots.
and a further adjustment made for the raker 40
5. In a chain saw Sharpener as set forth in'
teeth.
claim 4 wherein said slide adjusting means in
What I claim is:
cludes a stationary threaded shaft carried by one
1. A chain saw Sharpener comprising a frame,
of said plates, and a nut threaded on said shaft,
a grinding wheel rotatably carried by said frame,
said slide having an opening in which a portion
a vertically shiftable carriage carried by said
of said nut engages whereby movement of said
frame, a pair of saw clamping plates disposed in a 45 nut lengthwise of said shaft will shift said slide.
ting teeth on one side of the saw and may be re
vertical position, means pivotally mounting said
ANDERS R. LOFSTRAND, JR.
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