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- Oct. 22, 1946.
A. w. MALL ETAL
‘
'
_ 2,409,775
CHAIN-SAW MACHINE
Filed March '24, 1942
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Oct. 22, 1946.
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A. w. MALL ETAL
;
CHAIN-SAW
v
- 2,409,775
MACHINE
'
Filed March 24, 1942 ' _
.5 Sheets-Sheet 2
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By
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‘ATTORNEY
-
Oct. ‘22, 1946.
A. w. MALL ET AL
CHAIN-SAW MACHINE
Filed March 24, 1942
2,409,775
.
5 Sheets-Sheet 3
INVENTORS
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Oct. 22, 1946.
2,409,775
A. w. MALL ET AL
CHAIN-SAW MACHINE
File?'March 24, 1942
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2,409,775
Patented Oct. 22, 1946
“UNITED: STATES V PATENT OFFICE’
Arthur William Mall, Flossmoor, and Walter L.
Gorden, Chicago, 111.
Application March 24, 1942, Serial No. 436,014
' ‘
7 Claims.
(01. 143-32)
1
2
.
Our invention relates to portable power driven
link-toothed woodcutting saws, commonly re
the sawing machine with the gasoline engine
ferred to as chain saw machines. A saw of this
Fig. 4 is a sectional view of the engine starting
shown diagrammatically;
type may be used for numerous purposes, such
as cutting down standing trees, bucking trees
device;
‘
‘
‘
'
Fig. 5 is a view of the chain tensioning rod;'
Fig. 6 is a fragmentary view showing the driv
ing sprocket and cutting teeth and one end of:
which have been felled and cutting piling and
railroad, ties.
‘
'
'
the chain guide plate;
A primary object of our invention is to pro
Fig. 7 is a sectional view of the driving sprock
vide a saw which will meet the requirements of
an all-purpose saw- In connection with this, 10 et taken on line l—'! of Figure 6 and showing a
modi?ed form of sprocket and sprocket shaft;
one of our objectives is to provide a means. for
Fig. 7a is a fragmentary sectional view show
driving the saw chain which means makes pos
ing the interior of the sprocket hub shown in
sible a reduced diameter of the driving sprocket.
By reducing the diameter of the driving sprocket,
Fig. 7;
we are able to reduce the width of the saw chain 15
' sprocket shaft shown in Figure '7;
guide plate, which is desirable when felling a
tree.
‘
Fig. 7b is another fragmentary view of the
Figs. 8, 9 and 10, showthe driving sprocket
’
separated into its. three complementary parts;
Another object of our invention is to provide
Figs. 11, 12‘ and 13‘ show the three types of
an automatic lubrication system which will lubri
_
cate the saw chain in any position and which 20 teeth which make up the cutting chain; ‘
Fig. 14 is a side elevational view showing the
lubricates the saw chain only while the saw is
operating.
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~
sawing machine as a unit;
_
.
Fig. 15 is a sectional view taken on line l5--l5
Another object is to provide combined means
of Fig. 4;
for swiveling the cutting end of the saw relative
to the motor and for detaching the cutting end 25. Fig. 16 is an enlarged sectional view of the
spring washer shown in Fig. 4; and
of the saw from the motor.
Fig. 1'7 is a fragmentary diagrammatic view‘
A still further object is to provide an auto
showing the sequence of the cutting chain teeth.
matic transmission of a type which permits a
‘ In the preferred embodiment of our invention
larger gear reduction ratio and a consequent
30 we have shown generally a chain sawing ma
reduction of chain speed.
A further object is to provide means for pre
venting lubricant-soaked saw dust from clogging
in the chain groove in the saw chain guide plate.
At‘further object is to provide a saw tooth hav
chine comprised of a power unit A, an automatic
transmission assembly B, a coolingvsystem C, an.
engine starting device D, a driving sprocket E,
an‘ idling sprocket F, a lubrication chamber G,
ing a ?attened portion for riding on the tracks 35 and a guide plate H for the cutting chain I.
‘Referring. to Figs. 1 and 2, we have shown
in the guide plate; thereby assuring longer wear-‘
one important feature of our invention consist
ing life.
ing of a combined lubricating and chain ten
A further object is to provide means for dis»
sioning assemblage. In a link toothed sawing
posing of the sawdust to prevent clogging in the
40 machine of the type shown, it is essential that.
sprocket.
.
the cutting teeth, sprockets and guide plate
A further object is to provide an engine start
groove be lubricated at all times. i
ing device which will‘become automatically dis
engaged .from the engine shaft in event the
engine back?res. A further object is provide a
quickly detachable driving sprocket which is self
aligning- with the groove in the guide plate.
We have provided a lubricating device which
supplies a continuous trickle of lubricant into
45 the driving‘sprocket while the machine is oper
ating andewhic‘h lubricant supply is out off auto
matically. the moment the machine stops run
Other ‘objects and advantages will become ap
parent upon reading the following description
A casting 2‘ is formed with a cylindrical por
and upon examination of the drawings in which: 50 tion 3 which forms a reservoir for the lubricant.
mng,
' Fig. 1 is a sectional view of that end of the
Fig. 2 is‘a side view of the same end of the
v
‘I
V
- Extending outwardly from the cylindrical por
tion 3 is a wall portion 4, (best shown in Fig. ‘2) ,.
sawing machine remote from the motor;
sawing machine;
.
_
which is preferably formed as an integral part
of casting 2. This wall portion 4 serves to sup
Fig. 3 is a sectional view of the motorend of 65 port one end of the guide plate H. This wall
24,409,775
3
portion 4 is also provided with an elongated slot
by rod 30. The rod 30 has a ?attened portion
3| at one end which is provided with a hole 32
as best shown in Figure 5. The idler sprocket
is mounted on a stationary hollow shaft 33 which
shaft is received in the bore 32 in rod 30. The
shaft 33 is ?rmly secured in a ?xed position rela
tive to rod 3!] by means of a pair of conventional
steel washers 34 and 35, which washers are tight
6, the function of which will be hereinafter de
scribed.
A handle 7 is provided at one end of casting 2
with a radially outwardly extending circular
disk-like portion 8, which serves as a cover for
the oil reservoir and is secured thereto by means
of screws 9. Enclosed within the lubricant
reservoir 3 is'a plunger assembly [0 comprised of
ly secured against opposite faces of the ?attened
a leather cup washer M, a pair of metallic stiffene 10 portion 3! of rod 30 by means of nut 36 and the
ing disks l2 and 13 mounted on opposite sides of
annular ?ange 3?. The diameters of the washers
the cup member and a third disk l4 having an
are greater than the width of the ?attened por
outwardly extending annular lip Ma, the func
tion 3i as shown diagrammatically in Figure 5,
tion of which will be hereinafter described.
so that the peripheral region of the washers ex
Rivets I5‘ secure the leather cup and disks to 15 tends beyond the edges of the ?attened portion
gether as a unitary plunger ID. An annular
3! of rod 30. The overlapping portions of wash
?ange l6 formed in the interior of handle 1 serves
ers 34 and 35 ride upon the oval shaped tracks
as a retainer stop for compression spring ‘H.
38 and- 39. Track 38 is shown in Figure 2 and
The compression spring I? is at all times nor
is preferably formed integrally with the wall por
mally urging the plunger ID in a direction away
tion 4 of casting 2. Track 39 is on the under
from the handle so that the lubricant contained
neath side of the wall 4 (viewing Figure 2) and
in the reservoir is at all. times under pressure
coincides with track 38. One end of track 39
urging it to ?ow in the direction of the sprocket
is shown in Figure 1.
F.‘ The lubricant is contained in that portion
The thickness of wall 4 measured in the region
of. the reservoir designated by numeral 18 and
of tracks 38 and 39 is a few thousandths of an
in Figs. 1 and 2 the plunger‘ is shown in a 'posi
tion wherein the reservoir is almost emptied of
inch less than the thickness of ?attened portion
its lubricant.
Extending into the interior of the reservoir 3
is‘an externally threaded shaft portion I9 which 30
is preferably formed integrally with casting 2.
An elongated sleeve 26 extends through the in—
terior of handle 'I and screwthreadedly engages
the shaft portion l9. Sleeve 20 is rotatably and
longitudinally movable relative to handle ‘I. A 35
spaced apart from each other sufficiently far to
permit sliding movement relative to tracks 38 and
39. Thus, when it is desired to adjust the ten
sion of cutting chain I, rod 30 may be moved
longitudinally within the limits of slot 6.
hand gripping knob 2| is’ secured to the end of
sleeve 20 by means of a set screw 22. The inner
end of knob 2"!v normally abuts the outer end of
3| of rod 39, whereupon washers 34 and 35 are
At the lower end of shaft 33 an anti-friction
bearing 40 is mounted and is secured in place
by nut 4!’. The rotative portion of idler sprocket
F is comprised of a- pair of circular disk-like
members 42 and 43 secured together by means of
screws 44.
The upper member 42 is provided
handle '3. The inner end of sleeve 2!] is formed
with an annular groove 45 in which the teeth of
with a radially outwardly extending annular lip 110 the cutting chain ride. The interior of upper
23..
A cup washer 24 is providedwith a central
aperture for receiving sleeve 20 and is abutted
at its inner periphery by the lip 23 and at its
outer periphery by plunger I0.
Thus, when it is desired to re?ll the lubricant
reservoir 3 this is accomplished by removing the
oil cap 25; then turning knob 2| counter-clock
wise. Upon turning knob 2i counter-clockwise,
sleeve 23‘ moves longitudinally in a direction away
from the driving sprocket as a result of its screw
threaded engagement with shaft portion l9.
Likewise, the plunger H1 is moved in the same
direction as sleeve 20 due to the lip 23 which en
gages the cup washer 24, which in turn engages
plunger [0. The function of cup washer 24 is
to prevent lip 33 from coming into contact with
the inner periphery 26 of the leather cup wash
er H.
member 42 provides a bearing retainer for bear
ing 49. The lower member serves to support the
oil pump 46.
The oil pump is comprised of a
shaft member 50 having a threaded nipple 41 at
_ its upper end.
The lower end is received in a
bore in member 43 and is securely fastened to
member 43 by means of nut 48 so as to be rotat
able therewith. A sleeve type bearing 49 is
mounted within shaft 33 and provides bearing
means for shaft member 50.
An L-shaped ?tting 5| is threaded onto the
upper end of shaft member 33 and is locked in
place by lock nut 52. The ?exible conduit 28 is
fastened to the ?tting 5i by means of nuts 53
. (shown in Figure 2). The ?tting '5] is provided
with a passage 54' which registers with a second
passage 55, which opens into bore 56.
Thus it
can be seen that the oil from reservoir 3 passes
As the knob 2| is turned counter-clockwise, the
plunger I0 is retracted against the compression
of spring I‘! until it assumes a position at the
opposite end of the reservoir from the position
shown in Figs. 1 and 2. The lubricant is then
poured into the reservoir and cap 25 is replaced.
Knob 2| is then turned in a clockwise direction
until sleeve 20 is screwed all of the way onto
shaft H! as shown in Figs. 1 and 2. The plunger
through the ?exible conduit 28 into passage 54
then through passage 55 into bore 53.
'
When the sawing machine is started up, the
idler sprocket F is caused to rotate due to the
cutting chain traveling in groove 45 and as the
sprocket starts to rotate, the oil pump shaft 59
also rotates. The rotation of the threaded nipple
41 causes the oil in bore 56 to commence to
trickle along the thread grooves of the threaded
I0, however, remains in its retracted position due
nipple until it reaches the small chamber imme
to the uncompressibility of the lubricant in the
diately below nipple 47. The oil then proceeds
reservoir. The lubricant travels from the reser
70
throughan
opening 58 in the wall of shaft 50
VOir 3 through a ?exible conduit 28 which has
9. connection with an oil passage leading through v
the sprocket F.
The reason for the ?exible con
duit 28 will be hereinafter described. Sprocket
F is an idler sprocket and is supported primarily
and thence into passage 53 which extends ax
ially through the oil pump shaft 58. Theoil then
passesthrough another opening 63 in the wall
of shaft 50, which opening registers with a pas
sage 6! which extends through sprocket mem
2,409,775
6
ber 43. Passage 6'! registerswith passage 62 in
member“ 811 is comprised of‘a disk member 88.‘v
sprocket member 42 and passage 62 opens 'into
having a centrally bored hub 89 'lwhich‘is keyed
the-bottom of groove 45.
to engine shaft
'
The oil is thus conveyed to cutting chain I,
thoroughly lubricating the entire chain. ‘ When
the sawing machine is not operating, the oil‘re
mains in opening 56 and is'substantially pre
vented from trickling past, the threaded nipple
41. due to the non-rotation of said nipple. Thus
85.
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i.
.
pins 9!, Driven clutchmember SZincludes a cy
lindrical cup-like member 93 havingv a. clutch
lining 94 pinned to the interior thereof. A cen;
trally bored‘ hub 95 receives the end of shaft 95v
it can be seen that we haveprovided a lubricat-L 10 and is keyed thereto.
ing- system which assures a steady trickle of oil
to the cutting chain while the machine is oper
.
i A pair of centrifugallyactuated clutch shoes
90 are pivotally mounted on disk 88 by means of.
The clutch is of the cen
trifugal type, ‘clutch shoes?90 overcoming tension
of springs 91 when the speed of engine shaft 85
reaches a certain R. P. M., said clutch shoes en
ating regardless of what position the machine
may be in and when the machine is not operating . gaging clutch lining 94 and imparting rotation
the flow of lubricant to the cutting chain is cut 15 to shaft 95. It is to be noted that clutch mem
bers?! is supported on a shaft separate from the
off. We have also provided a means for adjust
engine shaft, shaft 86 being supported by a cross
ing thetension of the cutting chain. Rotatably
wall 98 which is secured by means of screws or.
and slidably disposed within sleeve 28 is a‘ sec
other fastening means to an annular shoulder
ond sleeve 64 which receives its bearing support
partly from ring 65 which is secured ’ within 20 99, preferably formed integrally with the gear
housing IOU.
.
sleeve 291 by a pressed ?t and partly from the
‘Shaft 96, is supported in anti-friction bearings
periphery of the annular flange ?ii-a at the in—
llll‘ and “E2, bearing 102 being of the needle type.
ner end of-knob 65. The knob 6% is secured to
Cross wall 98 has an outwardly extending arm
sleeve M by set screw 6?.
[03,which has a hub I04 receiving one end of.
The threaded end of rod 30 receives a nut
shaft 96. Bevel gear IE5 meshes with gear 106
member 68 which is secured by a pressed ?t in
to‘transmit rotation to sprocket E at a reduced
to the inner end of sleeve 64 so as to be rotatable
speed. Gear its is supported on sprocket shaft
therewith.
I01, which is supported in anti-friction bearings
“A compression spring 63 continuously urges
H18 and £39. Driving sprocket E may be secured
sleeve‘ 64 in an outwardly direction, thereby
tcsprocket shaft Ill‘! by being threaded thereonto.
causing rod 39 and sprocket F to move in the
‘Gear housing I00 has a bracket member Ill
same direction and thereby causing the cutting
chain I to be under a constant resilient tension,
extending therefrom which is rounded at its outer
end. l [2 so as to prevent any tendency of jamming
The'amount of tension on the cutting chain may
be increased or decreased by simply turning 35 when cutting through a log. It will be noted that
knob 66. The ?exible oil conduit 23‘ permits
the cutting chain I travels in the direction indi
movement of the rod 30, sprocket F and ?tting
cated by the arrow in Fig. 14 and therefore when
5|, relative to casting 2. The tension of the cut
a log or tree is being cut, the log rides against
ting chain is ?rst (roughly) adjusted by loosen
surface I i2 ‘during the cutting thereof.
ing jbolts ‘iii and manually moving the casting 2 40
One important objective which we have sought
relative to guide plate H and then retightening
to accomplish, is to cut down the over~all weight‘
said‘ibolts. The guide plate H is provided With
of the sawing machine to a minimum without de
an elongated slot ‘H (shown in Figure 6 and in
creasing its horsepower output. This is accom
dotted lines, in Figure 2). A removable bracket
plished partly by securing the driving member of
clamp 12 securely clamps the guide plate in a
the clutch onto the engine shaft and by support
?xed position relative to casting 2 when bolts
ing the'drivenmember of the clutch on a sepa
‘iii are tightened.
'
rate shaft as hereinbefore described.
In order to know when to re?ll the oil reser
' This arrangement permits the use of a clutch
voir, we have provided a measuring indicator rod
having a smaller diameter for the reason that
15 which is journaled in a hole drilled through 50 the clutch driving member 81 rotates at the same
the inner end of handle 1. Handle 1 is also pro
R‘. P. M. as the engine shaft, which speed is sev
vided with a slot 16 into which rod 15 can travel;
eral times greater than the speed of sprocket
When the reservoir‘is empty, the free end of rod
shaft Nil, thereby imparting greater centrifugal
‘i5 is in'the position shown in Figure 2. The rod
force to clutch shoes 90 and therefore increased
is providedat one end with a head‘ which is en
gaged by the lip [40: of disk member 14. Thus
the indicator rod is secured to plunger Ii] so as to
move therewith at all times.
Casting 2‘ may be provided with a number of
clutching action. Likewise, the torque load on
the clutch is reduced as a result of the speed re
duction gears I05 and‘ I06, consequently requiring
lessvclutching capacity.
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‘
,
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i In a portable chain sawing machine, it is ‘nec
bosses-l8 so that handle 18 can be inserted in 60 essary that the saw be capable of operating in any
any one of them. Referring to Figure 14, we
have shown the cutting chain I in‘ dotted lines
and the'chain groove 80 in guide plate H is also
shown in'dotted lines. The depending tongue 8|
of chain tooth 82 rides in the groove Bil. See
Fig. 11. Referring to Figure 3, we have provided
an automatic transmission system designated
generally as B, whereby the stopping‘and start
ing of the cutting chain is automatically con.-.
trolled according to the speed of the engine A, 70
and the torque transmitted'through the clutch.
Extending outwardly from engine A is the en
gine shaft 85 supported ‘in roller bearings 86. At
the‘ end of shaft 85 clutch member 81 is secured
position, consequently, when a gasoline engine
is used as the power unit, it is necessary to ad
just the cutting chain I and guide plate H, rela—
tive to the engine. We have provided an adjust
ing device which can also be used to separate the
gasoline engine from the remainder of the saw
ing machine. Referring to Figure 3, we have pro
vided a clutch housing H2, which is secured to
the main engine housing by means of bolts 1 l3.
Secured to gear housing I00 is an annular bronze
ring H4 having external threads H5. This ring
H4 has‘ a radially inwardly extending annular
shoulder H6 which normally abuts the end of
thereto'so'as to be rotatable therewith. Clutch 75 clutch housing H2 and an axially extending cir
2,409,775
7
cular ?ange H1 encircling the end of housing I.I2'
so. as to be rotatable relative thereto.
A second annular bronze ring I I8 screw-thread
edly engages the ring II4. Said second ring II8
has a radially inwardly extending annular ?ange
H9 normally abutting the circumferential face
I20 of clutch housing H2. A plurality of bosses
8
member I48 has a radially outwardly ?ared end
portion I49 which is provided with slots I59
adapted to register with steel balls I46 during
the operation of starting the engine. An angu
larly-inclined disk I5I prevents dirt from get
ting into slots I53. The operation of the steel
balls in co-operation with starter member I48
I2I are formed in the annular ring H8 so as to
is conventional. When the engine is at rest,
provide threaded sockets for receiving handles
ball carrying member I44 is likewise at rest as
I22.
.
10 it is secured to fan I2'I which, in turn, is secured
Thus, it can be seen that when it is desirable to
to engine shaft 85. One of the many recesses
transport the sawing machine from one locality to
I45 assumes an upside down position as shown
another, the ring H8 can be turned counter
in Fig. 4, causing ball I46 to respond to the action
clockwise until it becomes separated from ring
of gravity. As soon as a manual pull is exerted
II4, then the cutting end of the sawing machine 15 on handle I38, rotation is imparted to starter
(including gear housing, gears, clutch member 92
shaft I42 and starter member I48. Rotation of
and shaft 96 can be separated from the engine
starter member I48 causes slot 155 to register
and carried as a separate unit. The ring I I8 can
with recess I45 and steel ball I46, drops into slot
not become lost because it will not clear the end
I59, thereby establishing driving connection be
of clutch housing H2, instead it will dangle on
tween the starter shaft I42 and engine shaft
clutch housing H2 until the sawing machine is
85. When the engine starts, balls I46 are thrown
fastened together as a unit again.
When it is
desired to adjust the guide plate and cutting
chain to a new position, then ring H8 is turned
counter-clockwise until the gear housing I 96 and
ring I I4 are free to rotate relative to clutch hous
ing II2. Then the gear housing is grasped man
ually and rotated to the desired position (the
axis of rotation being the same as the axes of
shafts 85 and 96). Then ring I I8 is turned clock
wise until the end of housing H2 is tightened
against shoulder H6, thereby securing the gear
housing I99 in its newly adjusted position. Thus
it can be seen that we have provided a device
into recesses I45 and remain there due to cen
trifugal force. We have provided starter member
I48 with an oil soaked packing I53 which sup
plies lubricant to sleeve bearing I 54. Bearing
I54 rotatively supports the free end of engine
shaft 85.
An important object of our invention is to pro
vide means for preventing the destructive effects
imparted to the starting device, when the en
gine “back?res.” Referring to Fig. 15, I have
shown a sectional view of starter member I48
taken on lines I5—I5 of Fig. 4. Slot I50 is pro
vided with a ramp portion I56 and a radially
which may be used alternatively for separating 35 extending wall portion I51’. When starting the
the sawing machine into two separate sections or
engine, ball I46 is jammed against wall portion
for adjusting the cutting chain and associated
I51 and when the engine starts, then the speed
parts relative to the engine.
of ball carrying member I44 exceeds the speed of
In line with our objective to reduce the overall
starter member I48 and ball I46 rolls up the
weight of our sawing machine as a unit, we have
ramp I56 and centrifugal force carries it up into
provided a starting pulley, fan and magneto as
sembly as a substantially unitary structure
Magneto I25 is provided with shoulder portions
I 26v to which the fan I2'I is secured by means of
bolts I28. Formed integrally with the fan I2'I
is a pulley I29 which may be used as an auxiliary
starting pulley for starting the engine in event
recess I45 as previously described. However,
when the engine back?res, the ball carrying mem
ber I44 reverses its direction of rotation and
ball I46 becomes jammed against wall I5‘! caus
; ing starter member I48 to be rotated in reverse
direction.
In order to prevent starter rope I36
and spring I39 from being torn loose from their
fastenings, We have provided slipping means for
starter shaft I42. Starter shaft I42 is provided
the rewind starter D is not used. A shroud I30
directs the ?ow of air from fan I21 to the cylinder
walls I3I of the engine for cooling same.
with a conical portion I59. A bushing I60 has a
Referring to Fig. 4, we have provided a rope type
conically tapered interior corresponding to the
engine starting device with a rewind spring. The
conical portion I59 and is received by a pressed
starter housing I32 has three legs I33 which abut
fit in hub I4I. A spacer bushing I6I is rotatably
the main engine casting I34 and are secured
and slidably received in bushing I62 which is
thereto by means of bolts I35. A starter rope I36
pressed into hub portion I63 of starter housing
is wound around pulley I31 and one end of the
I32. Spacer bushing I6I extends beyond the
rope is secured to the pulley and the other end
end of hub MI and engages a spring washer
extends through an opening (not shown) in the
I64 (enlargement of which is shown in Fig. 16).
wall of the starter housing I32 and is secured to a
A self locking nut I65 is screwed onto the end
handle I38.
of starter shaft I42 until it is flush with the
A clock spring £39 is secured at one end, to
spring washer, permitting a slight axial move
the starter housing I32 by means of a pin I49
ment of bushing I6I against the resiliency of
threaded into a wall of the starter housing. The
spring I64. Normally the tension of spring I64
other end of spring I39 is secured to hub I4I
is great enough to urge bushing I6I and bushing
which is rotatable with starter shaft I42. The 65 I6I! axially so that the frictional engagement
mode of operation of the spring I36 in co-oper
between the conical surfaces of shaft portion I59
ation with starter rope I36 is conventional in the
and bushing I60 is sufficient to establish driving
art and is hereinafter described. Secured to the
connection between pulley I3‘! and shaft I42 when
hub portion I43 of fan I2‘! is an annular ball
starting the‘ engine. In event of back?re, how
carrying member I44 which is provided with a 70 ever, this frictional engagement is overcome and
plurality of angularly inclined cylindrical re
the conical portion I59 of shaft I42 slips rela
cesses I 45 in each one of which is a steel ball
tive to bushing I66 and shaft I42 and its asso
I46. See Fig. 15. The starter shaft I42 has
ciated parts are free to rotate relative to bush
a threaded end I41, which receives starter mem
ing I69 and its associated parts, thereby pre
ber I48 so as to impart rotation thereto. Starter 75 venting pulley I31 and spring I39 (which are
,
secured to bushing‘yl?o through; the'medium of
‘
.
,
that‘theirircutting {edges are bent in opposite‘dl
rections. The teeth .are fastened together with
hub ,I 41.)"‘from beingrotated so'La's to ‘keep the
starte'r'rope I36 andspringll39 from being torn
loose from‘ their fastenings.
10
Likewise'tooth I9'I‘is identical to tooth 82,‘ except
'
rivets'l99.
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‘
I
.
'
‘Referring to Figs‘. 7, ‘7A and 713; we have
shown a modi?ed‘form of driving connection be-'
, Referring to Figs. 6 to 13, wehave shown our
drivingsprocket El‘al‘ld cutting chainiI in detail.
The driving ‘sprocket E is made up of the com
tween thesprocketE1 andthe sprocket shaft IU'Ia.
ponent parts shown in Figs. 8, 9 and 10. Sprocket “
Sprocket shaft‘ I?'Ia is provided with spline slots
. plates
2%, ‘which mate ‘with th‘e corresponding spline
I58 and I69 are identical in size and
shape and sprocket plate H0 is formed with a cen 10 teeth 20I in the‘interior of hub I1 I. Theseteeth
tral hub‘ I'l_I .(Fig. '7). ‘ Plate I68 ?ts onto one end
and slots preferably extend around the entire cir-i
‘cum‘f‘erences of the shaft I01 and ‘huh I ‘II. ‘ ‘
,
of the hub and plate I 59 onto ‘the other end
‘Arr ‘annular groove 202 is formed in the 111-:
so thatplate I‘II! is‘ between‘ them.. ‘Whenthe
Said groove 202 is comprised
plates [68, I69 and I'll) are assembled’ together
to form a ‘unitary sprocket, th‘e‘ teeth on} each
plate coincide to form _a ‘single ‘unitary tooth
as shown i‘nlifig. 6. Rivets l'lzmake the sprocket
an integral unit as shown in Figs. 6 and '7. I ‘
Animpdrtant object of‘ourinventionia to pro
vide a-sprocke‘t tooth which will‘éxert equal drive
ing pressure on’each’ of the teeth which make
up the cutting chain‘; thereby providing a more ‘
positive ‘drive on the cutting chain whereby
sprocket diameter may be“ reduced to a minimum
and whereby wear and tear on the chain rivets
I $5 ‘is reduced.
To accomplish this, we have
provided‘ each sprocket tooth‘with‘a driving face
having-a radius which coincides ‘with the radius
of the chain tooth.‘ Thus the‘ radii of the driving
faces. I15, I16 and I1] coincide with‘the radii
I18, I191 and I80‘ on the ‘chain’ teeth. "In addi
tion, it will be'noted that‘the notches If“ and
is
ot a series of notches 293 formed in each of the
spline teeth 2M, thereby forming’the continuous
annular " groove ‘202. A hole drilled radially‘
throughthe sprocket shaft IE1 is provided‘ with
a threaded regionat one end into which set screw
2M; isthreaded.v A compression spring205 abut
ted by one‘end of set screw 2M; urges steel ball‘ 20!;
radially outwardlyl at all times so that ‘part of the
ballp‘rotrudes beyondlthe exterior surface of the
spline slot, 2lliland drops into one of the notches
2B3 thereby locking the sprocket Efonto the
sprocket shaft I til. It will be noted that the area
infslot 20%] adjacent the ball 206 is peenedslightly
so that the ball cannot drop out when sprocket E‘
is‘removejd from the sprocket‘shaft. vIt willalso‘
‘ be noted that the‘width of ‘notches, ‘203 is greater
‘than the diameter ‘of ball ‘206, thereby‘ permitting
the sprocket, E to move axially relative to sprocket
shattjultl. ‘ This is an important'feature of our
coincide with-the contour of the, outer ‘end "of the
sprocket teeth.‘ Likewise, when chain teeth" 82',‘
I83 and I84 ar'eassembled, the radial faces I ‘I8;
I19‘ and 18d coincide and have a‘cominonaxis
invention, since‘this makes sprocket E‘ selféali‘gn}?
mg ‘with groove 80 in guide plate I-I, the‘reby elimi'f‘
hating‘ the necessity of accurate machining and
which‘. is the center of rivet holes I85‘, I88 and
I81. Thus, it‘ can be seen'that ‘the sprocket teeth
accurate assembling ‘of sprocket shaft I01 within‘
g‘eanhousing‘ Hi0. 1' ‘By-‘referring to Figures 3 and
6, it *canbe- seen howl‘sp‘roc‘ket E is‘ ‘aligned with
engage each chain tooth simultaneously and with
guide plate ‘H in'a co “
equal ‘driving pressure"6n‘= each chain tooth.
Iit‘iw‘i-ll'be'noted‘ that‘sprocket plate "0 has re
chain‘iil? can travel in‘aj-isingle plane:
y'"- Havir‘i‘glitliuslidescribed ‘our; ‘invention’;
cesses I88 which coincide with the contour of the
claim is:
on plane‘so‘ that ‘cutting
‘ ‘
‘i
depending tongue BI of chain tooth 82 and into‘
1. A chain saw machine comprising a power
which the tongues 8I ?t while the chain teeth are‘ 45 unit, a chain guiding plate extending therefrom,
traveling about the sprocket. Sprocket plates
a cutting chain, a combinationchain lubricating
and chain tensioning device secured to the end
I68 and IE9 are provided with a plurality of holes
of the guiding plate opposite the power unit,‘said
I89 which facilitate the disposal of sawdust while
device including a lubricant chamber, a sleeve
the sawing machine is operating.
Another feature of our invention is to provide 50 portion extending from one end wall of said
chamber, a second sleeve screw-threadedly en
a notch I90 in the depending tongue 8| of chain
gaging said sleeve portion so as to be adjustable
tooth 82. Said notch I90 has a face I9I which is
angularly inclined relative to the base of tongue
relative thereto, said second sleeve being rotat
ably supported within said device, a third sleeve
8! so that when the tongue 8| is riding‘in the
disposed within the second sleeve so as to be ro
groove 6!] in guide plate H, the tip I92 cleans out
any sawdust which may tend to become packed
tatable and slidable relative thereto‘, a plunger
into groove 88. The tendency of sawdust to pack
within said lubricant chamber, said second sleeve
. serving to retract said plunger for re?lling the
in groove 80 is enhanced by the fact that oil from
lubricant chamber and said third sleeve serving to
the idling sprocket F becomes mixed with the
60 adjust the tension of the cutting chain.
sawdust and facilitates packing thereof.
2. A chain saw machine comprising a power
It will also be noted that chain teeth I83 and
unit, a chain guiding plate extending therefrom,
IE4 are provided with tits I93 which in turn pro
a cutting chain trained about said guiding plate,
vide an elongated flat surface ‘I94 for the under
a combination chain lubricating and chain ten
neath portions of teeth I83 and I84. These ?at
sioning device disposed at the end of the guiding
surfaces ride on the rim E95 of guide plate H dur
plate opposite the power unit, said device includ
ing the time that tongue 8I of chain tooth 82 rides
ing a lubricant chamber, a sleeve portion extend
on the bottom of groove BI]. The ?at surfaces
ing from one end wall of said chamber, a second
increase the wearing life of the bottom edges of
sleeve screw-threadedly engaging said sleeve por
chain teeth I 33 and I84.
tion so as to be adjustable relative thereto, said
Fig. 17 shows the sequence of cutting chain I.
second. sleeve being rotatably and slidably sup
The cutting chain is made up of ?ve different
‘kinds of teeth, including teeth 82, I83 and I84
‘ ported within said device, a, third sleeve disposed
within said second sleeve so as to be rotatable
heretofore described. Tooth I96 is identical to
tooth I83 except that the cutting edge of the
and slidable relative thereto, a sprocket support
tooth is bent oppositely to that of tooth I83. 7.5 ing rod received within said third sleeve so as
2,409,775
11
12
to be adjustable relative thereto, a plunger with
in said lubricant chamber, said second sleeve
serving to retract said plunger for re?lling said
lubricant chamber and said third sleeve serving
to retract said sprocket support rod whereby to
spring surrounding the rod and being interposed
adjust the tension of the cutting chain.
'
3. A chain saw machine comprising a power
unit, a chain guiding member extending there
from, a cutting chain trained about said guiding
between the wall portion and one end of the sec
ond sleeve, and a third sleeve surrounding the
?rst and second sleeves and being screw-threaded
onto the ?rst sleeve.
5. A chain saw machine as described in claim 4
wherein a stationary hollow handle receives with
in its interior the third sleeve said third sleeve
being rotatably and axially movable relative to
member, a support member secured to an end of 10 the handle.
the chain guiding member, a hollow sprocket
6. A. chain saw machine comprising a power
shaft, an idling sprocket carried by the sprocket
shaft, means associated with the support member
for lubricating the cutting chain, said means in
cluding a lubricant chamber, a spring-pressed
unit, a cutting chain driven thereby, a guide
member for said cutting chain, a sprocket shaft
having driving connection with the power unit,
a sprocket mounted on the sprocket shaft, a hub
plunger therein for maintaining constant pres
for said sprocket, the interior surface of said hub
sure behind the lubricant, a ?exible lubricant
being serrated axially, the sprocket shaft having
conduit leading from the chamber to the sprocket
corresponding axial serrations whereby the
shaft, an oil passage leading through the sprocket
sprocket hub and sprocket are movable axially
shaft and opening into the periphery ofv the 20 of the sprocket shaft but are not rotatable rela
sprocket and means associated with the sprocket
tive thereto, means within the sprocket shaft for
shaft for substantially cutting off the ?ow of
limiting the axial movement of the hub and
lubricant to the cutting chain when the chain
sprocket relative to the sprocket shaft and also
saw machine is not operating, said means includ
for preventing the hub and sprocket from becom
ing ‘t threaded nipple rotatable within the hollow 25 ing disconnected from the shaft.
sprocket shaft.
7. A chain saw machine comprising a power
4. A chain saw machine comprising a power
unit, a cutting chain driven thereby, a guide
unit, a chain guiding member extending there
member for said chain, a shaft, a sprocket mount
from, a driving sprocket at one end of the chain
ed on said shaft and being axially movable there
guiding member, a driven sprocket at the other 30 on, means on said shaft for effecting rotative
end of the chain guiding member, a cutting chain
movement of the shaft and sprocket as a unit and
trained about the sprockets and chain guiding‘
means within said shaft and sprocket for limiting
member, a support member secured to the chain
the amount of axial movement of the sprocket
guiding member, said support member having a
relative to the shaft, said last means normally
slot therein, a sprocket shaft extending through 35 serving to prevent the sprocket from becoming
the slot, 2, rod carrying said sprocket shaft, a
disconnected from the shaft and said last means
wall portion on said .support member, an open
including an annular groove in the sprocket and
ing in said wall portion, the rod extending
a constantly spring-pressed ball mounted in the
through said opening, a sleeve extending from
shaft and protruding into the groove.
the wall portion, a second sleeve slidably and 40
rotatably journaled in the ?rst sleeve, said sec
ARTHUR w. MALL.
ond sleeve screw-threadedly engaging the rod, a
WALTER L. GORDEN.
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