close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3084696

код для вставки
April 9, 1963
H. 5. BROWN ETAL
3,034,679
POWER LAWN MOWER WITH BUILT-IN ENGINE STARTER
Filed May 1a. 1959
5 Sheets-Sheet 1
/ggm
April 9, 1963
H. s. BROWN ETAL
3,084,679
POWER LAWN MOWER WITH BUILT-IN ENGINE STARTER
5 Sheets-Sheet 2
Filed May 18, 1959
mm
“Na.“
.m.‘aW
d
lwww
2Q ;
w
R§\
,2‘|- “w.
m.
3I .2 ,_.
mm“.
..
QM
.R
u.
3Q“
mum
mm\,.
‘mm\Q
N‘\N
\\
a
a.
uni
,/I|
aan
F
mm.m.
-.\mm
A“,
000I
'“EH‘
?vyfl 5.3mm
1'22 12'? 5122222552222
April 9, 1963
H. 5. BROWN ETAL
3,034,679
POWER LAWN MOWER WITH BUILT-‘IN ENGINE STARTER
Filed May 18, 1959
5 Sheets-Sheet 5
W
Hug/5 i 2mm?
m1:
April 9, 1963
H. s. BROWN ETAL
3,084,679
POWER LAWN MOWER WITH BUILT-"IN ENGINE STARTER
5 Sheets-Sheet 4
Filed May 18, 1959
a.
L
‘m
zwnwR
a.E
152/9717 52mm
[b 155 jwzw’im
§B t
April 9, 1963
H. s. BROWN ETlw-\L
,
3,084,679
POWER LAWN MOWER WITH BUILT-IN ENGINE STARTER
Filed May 18, 1959
5 Sheets-Sheet 5
\\\\\
\\\\
\Ml/\
United States Patent 0 " 1C6
1
3,084,679
POWER LAWN MOWER WITH BUILT-IN
EN'GWE STARTER
Hugh S. Brown, Wauwatosa, and lb H. Svendsen, Mil
wanitee, ‘Wis, assignors to Briggs & Stratton Corpora
tion, Milwaukee, Wis, a corporation of Delaware
Filed May 18, 1959, Ser. No. 813,750
8 Claims. (Ci. 123-179)
3-,@84,b79
Patented Apr. 9, 1963
2
of the hereindisclosed invention may be made as come
Within the scope of the claims.
The accompanying drawings illustrate several complete
examples of the physical embodiments of the invention
constructed according to the best modes so far devised
for the practical application of the principles thereof, and
in which:
FIGURE 1 is a perspective view of a lawn mower of
the rotary type embodying this invention, ‘and wherein the
right rear wheel of the mower houses the starter mecha
This invention relates to power lawn mowers in which 10
nism;
the cutter blade means is driven by an internal combus
FIGURE 2 is a vertical sectional view through the
tion engine, and has as its purpose to provide an improved
right rear wheel or" the mower on an enlarged scale and
and simpli?ed starter for the engines of such lawn mowers.
taken generally on the plane of the line 2-2 in FIGURE
The starting of the internal combustion engines of
1, illustrating the starter mechanism in its clutch-engaged
lawn mowers until just recently has always involved 15 condition, in which condition rotation of the wheel as a
manually pulling on a starter rope. The rope was either
result of forward movement of the mower, winds up the
manually wound about a pulley ?xed to the engine crank
spring of the starter mechanism;
shaft, or, where the engine was equipped with a rewind
_ FIGURE 3 is a View similar to FIGURE 2 but show
type starter, it was attached to a pulley acted upon by a
spring to retract and rewind the rope onto the pulley
whenever it was released. But, in all cases, the rope had
ing the starter mechanism in its clutch-disengaged condi
tion, in which condition the force of the spring has been
to be manually pulled to start the engine.
released;
springs are wound up by hand, usually by turning a
crank, and they ‘are so connected with the engine that
upon release of the force stored in the wound up spring,
invention;
FIGURE 4 is an exploded perspective View of the
Recently, however, some mower manufacturers have
starter mechanism showing the parts thereof substan
adopted a wind-up spring motor type of starter mecha
tially in their order of assembly;
nism. These starter devices are energized, that is, their 25
FIGURE 5 is a vertical sectional view similar to FIG
they impart engine-starting rotation to the crankshaft.
Although the adoption of such wind-up spring motor
engine starters has been hailed in some quarters as an
improvement of great magnitude, the need for stooping
URE .2, but illustrating a modi?ed embodiment of the
‘ FIGURE 6 is a view similar to FIGURE 5 but show
ing the starter mechanism in its clutch disengaged condi
non;
FIGURE 7 is an exploded perspective view of this
modi?ed form of starter mechanism; and
FiGURE 8 is a perspective View illustrating still an
other embodiment of this invention.
over and manually winding up the spring is still an in
convenience, and, in fact, hazardous in the case of rotary
mowers, since it necessitates the operator placing himself 35
Referring now particularly to the accompanying draw
close to the orbit of the revolving cutter blade. In con
ings and, more especially, to FIGURES 1 through 4 which
trast, the present invention retains all the advantages of
the wind-up spring motor starter but, in addition, provides
illustrate the preferred embodiment of the invention, the
a safer, more facile way of energizing the spring motor,
since it completely eliminates the need for stooping over
type lawn mower which, as is customary, comprises an
inverted pan-like body 6 having a deck 7 and a depend
ing skirt 8. Three wheels 9 and one wheel 9:: support the
chassis for free movement over the ground, and a handle
and manually winding up the spring.
To this end, it is an object of the present invention to
provide a power lawn mower equipped with a wind-up
numeral 5 designates generally the chassis of a rotary
19, connected with the chassis, provides means for manu
spring motor type engine starter which may be wound
ally pushing the mower along, or guiding it, if it is of
up or energized by simply rolling the mower along the 45
the
self-propelled variety.
ground for a short distance, and wherein the force stored
The mower is equipped with the customary cutter
in the spring may be released to start the engine by
blade 11 located below the deck and inside the skirt, to
simply moving a small release lever conveniently located
be revolved at high speed by an internal combustion
on the handle of the mower.
engine 12 mounted above the deck. The cutter blade lil
Another object of this invention is to provide a power 50 is ordinarily secured directly to the lower depending end
lawn mower with an engine starting mechanism which is
of the engine crankshaft; and at its top the engine mounts
substantially entirely contained- within one of the wheels
a rewind rope starter mechanism indicated generally by
of the mower.
the numeral 13. This rewind rope starter may be like
to
provide
a
starter
Another object of this invention is
that of the Perry Mack Patent No. 2,564,787, issued Au
mechanism for power lawn mowers which is so ?exible 55 gust 21, 1951. It includes a pulley 114, to which one
in design and adaptation that it may be applied to the
end of a rope 15 is attached and about which the adja
lawn mowers of practically any lawn mower manufac
cent end portion of the rope is wound. A rewind spring
turer.
(not shown) acts upon the pulley to cause the same
A further object of this invention is to provide a power
to rewind the rope thereon after each pull on the rope.
lawn mower having an engine starter mechanism built into 60
it, and of such simple and rugged design and construction
Suitable unidirectional clutch means (not shown) con
as to be fully capable of withstanding the rough handling to which equipment of this nature is subjected in use.
crankshaft whenever the rope is pulled. '
nect-s the pulley 14 with the adjacent upper end of the
Heretofore, the rope had to be pulled manually, i.e.
Still another object of this invention is to provide an
the operator merely grasped a handle on the end of the
engine starter for power lawn mowers which requires no 65 rope and pulled on it to start the engine. The present
strength or skill to operate.
invention obviates the need for manually pulling on the
With the above and other objects in view which will
starter rope and, instead, supplies a wind-up spring motor
appear as the description proceeds, this invention resides
20 for this purpose. This spring motor is operatively
in the novel construction, combination and arrangement
connected with the engine through the rope 15 and the
of parts substantially as hereinafter described and more 70 rewind starter 13 to apply engine starting rotation to the
particularly de?ned by the appended claims, it being
crankshaft of the engine upon release of the force stored
understood that such changes in the precise embodiment
3,084,679
3
in the spring motor, providing, of course, that the motor
has been wound up or energized. The manner in which
the motor spring is wound up constitutes a major feature
of this invention. Another feature is the particular con
struction of the spring motor and its location on the
mower.
The spring motor 20 is built into one wheel of the
mower, preferably its right rear wheel 9a.
This wheel
is mounted on a short, ?xed axle or spindle 21 secured to
4
that, as the pulley is spun by the unwinding spring, the
rope will be rapidly wound about the pulley. This applies
the desired engine starting pull on the rope.
By the same token, as the spring is ‘wound up, the rope
pulley 34 turning with the spring driver 38, rotates in the
opposite direction, and thus allows the rewind pulley .14
on the engine to keep the rope taut and unwind the same
from the pulley 34.
Rotation of the wheel 9a in the ‘forward direction as the
and projecting laterally from the adjacent portion of the 10 mower is pushed forwardly along the ground, turns the
skirt 8, as at 22. The wheel is cup-shaped and has a side
spring winder 38 in the direction to wind up the spring,
wall 23 with a hub 24 at its center, and a rim 25 at its
provided that the clutch of the starter mechanism is en
periphery carrying a tire 26. The wheel is not journalled
gaged. The complementary components of the clutch are
directly upon its axle, but upon the hub 27 of a combined
the collar 40 and a driver disc 50. These parts have inter_
spring housing and ?xed gear unit 22%. The hub 27 is 15 engageable clutch teeth or jaws 401' and Sill’, the engage
keyed to the axle and clamped against a shoulder 29
ment of ‘which is controlled by the cam sleeve 32. To this
thereon.
end, the earn sleeve has a helically disposed cam track 51
A plate 36 is detachably secured to the rim 25 of the
extending around part of its circumference and in which
wheel to close its open side and thereby form an enclosure
a pin 52 ?xed .to the axle 21 is received. Preferably, the
for the starter mechanism. A hub 31 on this plate, co
ends of the cam track 51 are parallel with one another
axial with the hub 24 of the wheel, coacts with the wheel
and normal to the axis of the sleeve for a distance suf?cient
hub to freely rotatably mount the wheel. A cam sleeve
to receive the pin 52 therein. This assures against acci
32, slidable and rotatable on the axle, and the hub 33
dental shifting of the cam sleeve from either of its two
of a rope pulley 34‘, which is journalled on the cam sleeve,
extreme positions.
are interposed between the axle and the bore of the hub 25
To enable intentional shifting of the cam sleeve, a lever
31. Hence, the hub 31, like the wheel hub, is indirectly
53 is secured to its outer end, and this lever is in turn con
journalled upon the axle. The wheel is thus freely ro
nected to a control lever 54 by means of a Bowden wire
tatable not only about its axle, but also about the com
54'. The control lever 54 may be mounted wherever con
bined spring housing and stationary gear unit
and normally is located on the handle 10.
Inside the combined spring housing and stationary 30 venient,
With
the
clutch engaged, as shown in FIGURE 2, the
gear unit 28, which is also cup-shaped and preferably a
inner
end
of
the spring is connected to the driver disc 50.
die casting, is the spring 35 of the wind-up spring motor.
Hence, ‘rotation imparted to the ‘driver disc 50, is also
transmitted to the spring driver 38. To enable the driver
secured to the unit 28 by means of a post 36 onto which 35 disc to rotate and also to keep it properly centered, it is
seated in a counterbore 23' in the combined spring hous
the looped end of the spring is attached. The other,
ing and ?xed gear unit. Rotation is imparted to the driver
inner end of the spring is hooked onto a claw 37 of a
This spring, as is customary, is a spiral coil, like an ordi
nary clock spring. Its outer end is anchored vby being
spring winder 88.
disc from the wheel by planetary gearing. This gearing
round hole 41 ‘which ?ts freely onto the end of the
sleeve 32 and a threaded counterhore 4?. into which the
adjacent end of the pulley hub 33 is screwed. The rope
?xed to the driver disc and meshing with the stationary
ring gear and the rotatable sun gear.
comprises ‘a stationary internal ring gear 55, which forms
The spring winder 38 is essentially an annulus or bush
ing having a non-circular hole 3‘9 in which an axially 40 part of the unit 28, a sun gear 56, which forms part of the
plate 30, and hence may be considered part of the wheel,
shiftable clutch collar 40 of corresponding non-circular
and a pair of planet gears 57 journalled on stub shafts '58
shape is slidably received. The clutch collar 4d has a
pulley and the clutch collar 4%‘ are thus connected to
gether to form, in e?ect, one unit, and except for as
Through this planetary gearing rotation of the wheel 9a
in the forward direction rotates the spring driver 38 in the
direction to wind up the spring, and it is signi?cant that
[because ‘of the mechanical advantage gained through the
sembly requirements, could be one integral part.
gearing, the winding of the spring requires practically no
By virtue of the non-circular shape of the clutch collar
and the hole in the spring driver in which it is received, 50 effort. It is accomplished without stooping or ‘any other
inconvenience by pushing the mower forwardly ‘for a dis
torque applied to the spring driver 3% by the spring as
tanoe of 15 or 20 feet. If the mower is moved too far,
it unwinds, is also applied to the rope pulley and, as
that is, beyond the point at which the spring is wound up,
a result, the rope pulley is spun rapidly upon release
the tire of the wheel 9a simply slides over the turf or
of the wound-up spring. It is, of course, to be under
stood that the claw 37 is so disposed on the spring driver 55 ground, and by its frictional engagement with the ground
the Wheel holds the spring in its wound-up condition.
that its connection with the spring enables the transmission
During the winding up of the spring in the manner de
of torque to the spring driver from the spring as it un
scribed, the rewind starter pulley on the engine winds the
winds, and from the driver to the spring as the spring is
adjacent end portion of the rope onto itself, as already
wound up.
A pair of axially aligned radial pins 43 ?xed in the 60 ‘described, so that the starter mechanism is in condition to
impart rapidly accelerating rotation to the crankshaft the
clutch collar have their inner ends projecting into an
instant the force in the wound-up spring is released. To
annular groove 44 in the cam sleeve 32, so that the
clutch collar and the rope pulley, while free to turn on
release the force of the Wound-up spring, it is only neces
ment of the clutch, without interfering with rotation
of the connected clutch collar and rope pulley.
collar 40. The instant the clutch teeth or jaws disengage,
the rope pulley 34 is spun by the unwinding spring to pull
sary to rock the lever 5-3 by means of the control lever 54
the cam sleeve, are held against axial shifting with re
spect thereto. This enables the cam sleeve to shift the 65 to cause the cam sleeve to rotate and, by such rotation, im
part clutch disengaging endwise movement to the clutch
clutch collar axially to effect engagement and disengage
A guide in the form of an eye or fair-lead 45 ?xed to
on the starter rope and start the engine.
Attention is directed to the exceptional compactness of
the chassis, guides the rope and holds its end portion 70
the
structure. It requires pnactioally no increase in the
which is attached to the pulley 34-, substantially in tangen
length of the axle 21 upon which the wheel 9a is mounted.
tial alignment therewith. Obviously, of course, any other
Another advantage of the described structure is that it
suitable guide means such as an idler pulley may be used,
does not interfere with raising or lowering of the wheel 9::
as long as it guides the rope without cha?ng. The direc
along with the other wheels of the mower to adjust the
tion in which the rope is reeved about the pulley 34» is such
elevation of the cutter blade, in those instances Where the
3,084,679
5
mower is equipped with wheels that can be raised and low
ered for this purpose.
Still another advantage of the structure just described is
that all the mechanism of the spring motor is not only
compactly located within one of the wheels of the mower,
but is eifectively sealed therein against dirt and dust.
6
cooperating elements of the clutch in this embodiment of
the invention, and as in the preferred embodiment, en
gagement and disengagement of the clutch is controlled
by the cam sleeve 68. To this end, the hub 66 is secured
against endwise displacement with respect to the cam
sleeve by being con?ned between a shoulder 79 thereon
and a release lever 80 secured to the end of the cam
The form of the invention illustrated in FIGURES 5-8,
inclusive, is very much like the preferred embodiment of
the invention, since it too has the spring motor contained
sleeve. A helical cam track 81 in the cam sleeve and a
within the right rear wheel 9a of the mower, but it does
axial clutch-engaging or clutch-disengaging motion of
the cam sleeve. Such rotation may be imparted to the
not have quite the compactness of the preferred embodi
ment and therefore entails increasing the overall width of
the wheel.
pin 82 ?xed in the stationary hub 60 and engaged in
the cam track translates rotation of the cam sleeve into
cam sleeve from a remote point, as for instance from
the handle of the mower by means of the release lever
In this modi?ed embodiment of the invention, it is the
83 secured to the cam sleeve and to which a Bowden
inner end of the spiral spring 35’ which is anchored, and 15 wire 84 is attached. Axial motion of the cam sleeve in
the outer end which is connected to the rope pulley 59.
one direction projects the pin "70 into the path of the lugs
To anchor the inner end of the spring, a hub 60* is keyed
73 and, in the other direction, withdraws the pin 70 from
and ?xed to the axle 61 upon which the wheel 9a is
in
front of the adjacent lug 75.
mounted, and the end of the spring is curled and hooked
In the two embodiments of the invention thus far de
20
onto a shoulder ‘62 on this hub. The axle 61, as in the
preferred embodiment of the invention, is secured to and
projects out from the adjacent portion of the skirt of the
scribed, the complete Windup spring motor is contained
within one of the wheels of the mower. Another way of
adapting the concept is illustrated in FIGURE 8 wherein
'
the windup spring motor unit, indicated generally by the
The bearings for the wheel, which is also cup-shaped, 25 numeral 90, is hingedly mounted on the chassis of the
are provided by the wheel hub 63 and a hub 64 at the
chassis.
mower, as at 91, and has a friction roller 92 positioned
to engage the tread of ‘the wheel 93 when the spring mo
of the Wheel. The wheel hub 63 is journalled directly on
tor unit is not supported in an elevated, inoperative posi
the axle but the hub 64 is journalled on the hub 66 of
the rope pulley 6-7, which, in turn, is journalled on a cam 30 tion.
Rotation of the roller 92' by forward propulsion of the
sleeve 68 slidably and rotatably mounted on the axle. The
mower winds up the spring of the motor unit and, when
wheel is thus supported for free rotation by relatively
it is wound up, the engagement of the roller ‘92 with the
widely spaced bearings; and since the cover plate 65
wheel 93 holds the spring in its tensioned or wound-up
closes the open side of the wheel, it cooperates with the
condition. Lifting of the entire spring motor unit thus
wheel to provide a totally closed housing for the spring 35 is all that is needed to release the force stored in the
motor.
Wound up spring; and as in the other embodiment of
The unanchored outer end of the spring must be posi
the invention the release of this spring force spins the
tively connected with the rope pulley so that the latter
rope pulley connected with the spring motor to wind the
partakes of all motion of this end of the spring. To pro
rope thereon. The mechanism by which rotation of the
vide this connection, the outer end of the spring is looped
roller 92 winds up the spring has not been illustrated
about a pin 70 ?xed to an arm 71 integral with and ex
since it could be simply a modi?cation of the comparable
tending radially from the hub 66 of the rope pulley.
mechanism of the fully described embodiments of the
The outer end of the spring must also be releasably
invention.
connectible with the wheel so that the spring may be
Any suitable means, as for instance a link 94 con
wound up by rotation of the wheel as the mower is rolled 45 nected to the housingof the spring motor unit and lead
over the ground. For this purpose, the pin '70 is project
ing to the handle, may be provided to lift the spring
ible beyond the looped outer end of the spring and
motor to its inoperative position to release the spring
through the bottom Wall of a cupped shell '72. in which
force; and although the weight of the motor alone is
the spring is coiled, to overlie the periphery of an inte
normally su?‘icient to maintain good tractive engagement
nal ring gear 73. This ring gear is rotatably supported
between the roller 92 and the tread of the wheel tire, a
coaxially of the wheel on a ?ange 74 on the stationary
spring (not shown) may be added for this purpose, if
hub 6i? and is con?ned between the bottom of the shell
desired.
'72 and the adjacent side of the wheel. Three drive lugs
From the ‘foregoing description, taken in connection
75 project radially from the periphery of the ring gear.
Thus, if the pin 70 is in its projected position (shown in 55 with the accompanying drawings, it will be readily ap
parent to those skilled in this art that this invention
FIG. 5, which illustrates the device in its clutch-engaged
achieves the utmost convenience and simplicity in the
condition) overlying the periphery of the ring gear, it lies
starting of lawn mower engines. It will also be under
in the path of the drive lugs, and will be engaged by the
stood that although the invention has been described as
nearest one of these lugs as the ring gear'turns. In this
manner rotation of the ring gear will be imparted to the 60 an improvement in lawn mowers, which is undoubtedly
its primary concern, there are other engine powered ap
unanchored outer end of the spring and the rope pul
_
pliances
or implements which would be 'bene?tted by this
ley 67.
invention.
Engine powered snow blowers, lawn sweepers,
The ring gear 73 is at all times drivingly connected
and soil tillers are illustrations of these other possible
with the wheel through planetary gearing comprising a
sun gear 76 formed on the hub 63 of the wheel, and a 65 ?elds of use for the invention.
What is claimed as our invention is:
planet gear ‘77 journalled on a stub shaft 7 8 and meshing
1. Means for starting an internal combustion engine
with the sun gear and the internal ring gear. The stub
which is mounted upon a wheeled chassis, the engine
shaft '78 is ?xed to the ?ange 74 about which the ring
being equipped with a rewind-type rope starter mech
gear turns.
anism wherein a ‘pull on the starting rope effects starting
Hence, if the mechanism is in its clutch engaged condi-v
of the engine, said means comprising: a ground engaging
tion, forward rotation of the wheels winds up the spring, ' wheel on the chassis; a rope pulley; means rotatably
and by resisting retrograde rotation when the forward
mounting the rope pulley on the chassis adjacent to said
propulsion of the mower is stopped, the Wheel holds the
ground engaging wheel, the end of the starting rope being
spring in its energized or wound-up condition.
The pin '70 and the drive lugs 75 thus constitute the 75 attached to the rope pulley so that rotation of the pulley
center of a cover plate 65v detachably secured to the rim
3,084,679
8
in one direction winds the rope thereon and applies an
engine-starting pull on the rope, while rotation of the
pulley in the opposite direction allows the rope to be
unwound from the pulley and retrieved by the starter
mechanism; a spiral spring coaxial with the rope pulley;
spring anchoring means ?xed with respect to the chassis
pulley rotatable about the horizontal axis of the ground
engaging wheel, means at all times attaching the live
end of the spring to one of the pulleys, and a rope having
one end attached to one of the pulleys to be wound about
the pulley upon rotation of the same in one direction and
having its opposite end similarly attached to the other
and having one end of the spring attached thereto; a
pulley so that rotation of either‘pulley in the direction
torque transmitting connection ‘between the other end of
‘to wind the rope thereon transmits rotation to the other
the spring and the rope pulley through which rotation
pulley; and manually operable means ‘to selectively elfect
is imparted to the pulley in the direction to allow the 10 engagement and/or disengagement of the manually con
rope to be retrieved by the starter mechanism as the
trollable clutch device.
spring is being wound up and in the opposite direction
4. The structural combination of claim 2, wherein the
‘pulley which is adjacent to the designated end of the
when the wound-up spring is released; and manually
controlled means to releasably drivingly connect said
crankshaft is dr-ivingly connected to ‘the driving element
other end of the spring with said ground engaging wheel 15 of the starter clutch.
so that the spring may be wound up by pushing the
5. The structural combination of claim 3, wherein the
chassis along the ground and released at will to rapidly
pulley which is above the starter clutch is drivingly con
nected to ‘the driving element of the starter clutch.
rotate the rope pulley and thereby impart an engine start
ing pull on the rope.
6. Means for starting an internal combustion engine
2. Means for starting an internal combustion engine 20 having a crankshaft and which is mounted on the deck
of :a wheeled chassis of a power lawn mower adapted
which is mounted on the deck of a wheeled chassis of a
to be operated by a person walking behind the mower,
power lawn mower adapted to be operated by a person
said engine also having a unidirectional starting'clutch
walking behind the mower, the engine having a crank
which has cooperable driving and driven elements and
shaft and a uni-directional starting clutch which has co
operable driving and driven elements and is located at an 25 through which starting torque may be imparted to its
crankshaft, said means comprising: a ground-engaging
‘end of the crankshaft above the deck of the lawnmower,
wheel on the chassis to turn as the mower is manually
said means comprising: a ground-engaging wheel on the
propelled across the ground; ‘a spring; ?rst motion trans
chassis to turn as the mower is manually propelled across
mitting means, including a manually controllable clutch
the ground; a spiral spring having an anchored end and
a live end; ?rst motion-transmitting means, including a 30 device, to operatively connect the spring with the ground
engaging wheel,‘ and through which means rotation of
manually controllable clutch device, to operatively con
said wheel tensions the spring when the clutch device is
nect the live end of the spring with the ground-engaging
engaged; second motion transmitting means operatively
wheel, and through which means rotation of said wheel
winds up the spring when the clutch ‘device is engaged‘;
second motion-transmitting means operatively connecting
the live end of the spring with the starting clutch, and ~
by which release of energy stored in the spring can im
connecting the spring with the starting clutch and by
35 which release of the energy stored in the spring can
impart engine starting torque ‘to the crankshaft through
the stanting clutch; one of said motion transmitting means
including a ?nst rotatable element mounted on the engine
part engine starting torque to the crankshaft through the
‘in juxtaposition to the starting clutch, a second rotatable
starting clutch; one of said two motion-transmitting means
including a ?rst pulley mounted on the engine in juxta 40 element rotatable about the axis of the ground-engaging
wheel, means connecting the spring with one of the rotat
position to the starting clutch and rotatable about the
able elements, and an elongated ?exible driving element
axis of the- crankshaft, a second pulley rotatable about
passing through the plane of ‘the mower deck and having
the axis of the ground-engaging wheel, meansat all times
attaching the live end of the spring to one of the pulleys, 4.5 a portion thereof above the deck, one end of said ?ex
ible element terminating at and being connected with
and a rope having one end attached to one of the pulleys
one of said rotatable elements and its opposite end termi
to 'be wound about said pulley in consequence of rotation
nating at and being connected with the other rotatable
thereof, and having its opposite end similarly attached
element so that rotation of each of said elements in one
to the other pulley so that rotation of either pulley in
direction transmits rotation in one direction to the other
the direction to wind the rope thereon transmits rotation
rotatable element, regardless of the relative positions of
to the other pulley; and manually operable means to
said rotatable elements; and manually operable means
selectively effect engagement and/or disengagement of
to selectively elfect engagement and/ or disengagement of
the manually controllable clutch device.
the manually controllable clutch device.
3. Means for starting an internal combustion engine
7. Means for starting an internal combustion engine
which is mounted on the deck of a wheeled chassis of a
power lawn mower adapted to be operated by a person
55 which is mounted upon the wheeled chassis of a hand
controlled walking~attendant type engine powered im
walking behind the mower, the engine having a vertically
disposed vcrankshaft and a unidirectional starting clutch
plement, comprising: :a ground-engaging wheel on the
at the upper end of the crankshaft, said means comprising:
ally propelled along the ground; a wind-up spring motor
chassis of the implement to turn as the implement is manu
a ground-engaging wheel on the chassis rotatable on a 60
inside said ground-engaging wheel; means operatively con
horizontal axis below vthe level of the chassis deck as the
mower is manually propelled across the ground; a spiral
spring having an anchored end and a live end; ?rst mo
necting said spring motor with the engine and through
which release of energy stored in the spring motor acts
to start the engine, said spring motor being normally un
tion transmitting means, including a manually controllable
manually controllable means to operatively con~
clutch device, to operatively connect the live end of the 65 wound;
nect the spring of the motor with said ground-engaging
spring with the ground engaging wheel, and through which
wheel and through which rotation of said wheel as the
means notation of said wheel winds up the spring when
implement is manually pnopelled along the ground acts
the clutch device is engaged; second motionetransmitting
to wind up the spring of the spring motor; and manually
means operatively connecting the live end of the spring
controllable means to effect release of the energy stored
with the starting clutch, and by which release of energy 70 in the spring motor.
stored in the spring can impart engine starting torque
8. Means for starting an internal combustion engine
to the crankshaft through the starting clutch; one of said
which is mounted upon the deck of a wheeled chassis of a
two motion-transmitting means including a ?rst pulley
hand-controlled walking-attendant type engine powered
mounted on ‘the engine above the starting clutch and
implement, the engine having a crankshaft, comprising: a
rotatable about the vertical axis of the crankshaft, a second
ground-engaging wheel on the chassis of the implement to
3,084,679
turn as the implement is manually propelled along the
ground providing said Wheel is in tractive engagement
with the ground; a spring motor; an anchor for the spring
?xed With respect to the chassis and having one end of
the spring attached thereto; means to operatively connect
the other end of the spring with the ground-engaging
Wheel so that the spring may be tensioned by manually
propelling the chassis along the ground; and means to
operatively connect said other end of the spring with the
crankshaft of the engine and through which release of
the energy stored in the tensioned spring acts to impart
engine-starting torque to the crankshaft of the engine, said
last named means including a ?exible tension member
in
passing through the general plane of the deck of the
chassis and having a part thereof disposed above the deck,
the ?exible nature of said tension member affording a wide
choice in the location of the engine on the chassis deck.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,307,941
2,182,529
2,623,603‘
2,767,808
2,912,966
Townsend ___________ __ June 24,
Wyrick ______________ __ Dec. 5,
Cutlan et al ___________ _.. Dec. 30,
Nicolls ______________ __ Oct. 23,
‘
1919
1939
1952
1956
Mitchell ____________ __ Nov. 17, 1959
Документ
Категория
Без категории
Просмотров
0
Размер файла
1 104 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа