close

Вход

Забыли?

вход по аккаунту

?

код для вставки
Nov. 13, 1962
w. c. WEHNER
'
>
3,063,437
ENGINE STARTER
Filed Sept. 8, 1959
7 Sheets-Sheet 1
INVENTOR.
WILLIAM C. WEHNER.
r
ATTORNEY
Nov. 13, 1962
W. C. WEHNER
3,063,437
ENGINE STARTER
Filed Sept. 8, 1959
7 Sheets-Sheet 2
8
No.ow
INVENTOR.
3% w. AM aw: ER.
ATTO RNEY.
Nov. 13, 1962
3,063,437
W. C. WEHNER
ENGINE STARTER
Filed Sept. 8, 1959
‘
7 Sheets-Sheet 3
FIG?
, LE’,
'I
I78,
5M:
T’
w
)
INVEN TOR.
'IO
WILLIAM G. WEHNER. -
BY
Nov. 13, 1962
w. c. WEHNER
3,063,437
ENGINE STARTER
Filed_Sept. 8, 1959
'7 Sheets-Sheet 4
\\
_ WHIP“ "up;
' /IIIIII
IN VEN TOR.
WILLIAM C. WEHNER.
5%4/
ATTORNEY
Nov. _ 13, 1962
w. c. WEHNER
.
3,063,437
ENGINE STARTER
Filed Sept. 8, 1959
'7 Sheets-Sheet 5
,
g'lAVA' , IIIIIIAWI
5
§“
g
n
I
JNVENTOR.
WILLIAM c. wan-man.
L
ATTORNEY
Nov. 13, 1962
w. c. WEHNER
3,063,437
ENGINE STARTER
Filed Sept. 8, 1959
7 Sheets-Sheet 6
I40
FIG.l2
FIG.I?)
INVENTOR.
WILLIAM C» WEHNER -
KM
ATTORNEY,
NW. 13, 1962
w. c. WEHNER
3,063,437
ENGINE STARTER
Filed Sept. 8, 1959
,
7 Sheets-Sheet .7
FIG.l4
I5,
FIG.
INVEN TOR.
WILLIAM C. WEHNE R.
“hm/W
ATTORNEY .
United States Patent 0
1
1C6
3,663,437
Fatented Nov. 13, 1962
5.,
3,063,437
ENGINE STARTER
William C. Wanner, Betreit, Mich, assignor to Moto
Mower, Inc, Gait Park, Mich, a corporation of Beta
Ware
Filed Sept. 8, 1959, Ser. No. 838,489
7 Claims. (til. 123-179)
FIGURE 12 is a cross-sectional view taken along line
12-12 of FIGURE 3;
FIGURE 13 is an end view of FIGURE 12 as indi
cated by the arrows 13-13; and
FIGURES 14 and 15 are views similar to FIGURES
12 and 13 respectively showing the parts in a different
position of operation.
Referring to the drawings, it will be seen that the lawn
mower comprises a deck 10 supported by a pair of idler
10 wheels 12 and rear driving wheels 14. An engine 16
in power driven lawn mowers and the like.
of the standard vertical crankshaft type is mounted sub
In my copending application Serial No. 774,976, filed
stantially centrally of the deck 10 and is suitably con
November 19, 1958, I have shown and described a starter
nected to the driving wheels 14 as will be described. A
for small internal combustion engines, which embodies a
handle 18 for guiding the mower is pivotally connected
flat spiral spring adapted to be wound by pushing the
vehicle (a lawn mower) a few steps, whereupon the spring 15 to the deck.
The crankshaft 20 of the engine 16 (see FIGURE 2)
may be released and the stored energy applied to the
is drivingly connected by a pulley 22 and a belt 24 with a
engine crankshaft for starting the engine. In said ap
driven pulley 26. The pulley 26 is keyed to a vertical
plication, the invention is shown in connection with a
shaft 28 (see FIGURES 3, 8 and 9) which is mounted
power lawn mower of the so called “push-type,” in which
the cutting blade is driven by the engine, but there is 20 vertically in a transmission housing 34. The ‘shaft 32 is
piloted in a boss 34 formed in the housing and is sup
no driving connection between the engine and the lawn
ported near its midsection by a ball bearing 30. A worm
mower wheels.
36 carried by the shaft 28 is meshed with a worm wheel
Obviously, it would be advantageous to utilize this
38 which is loosely mounted on the shaft 46. A clutch
type of engine starter in a self propelled lawn mower,
but some di?iculty is presented in so doing because of the 25 collar 42, carried by the shaft 40, abuts the worm wheel
38 and is secured to the shaft by the rollpin 44. The
differential, or one way drive, commonly employed in
collar carries a slidable clutch member 46 which is driv
these mowers. This type of drive is more or less con
ingly connected thereto by means of a key 45. The
ventional and comprises a driving axle provided with a
latter has clutch teeth 48 which are adapted to engage
pinion at each end thereof. The pinions are driven
through ratchet type, one way, driving connections and 30 mating teeth 50 formed on the gear ‘38. A spring 52 is
disposed between a shoulder formed on the clutch mem
are meshed with internal gears in the mower wheels.
ber 46 and an annular stop member 54 for urging the
This type of drive permits easy steering of the mower
clutch member into driving engagement with the gear 63.
and is in widespread use.
A shifter fork 56 carried by a shifter rod 58 engages the
In applying my improved starter to this type of mower,
it is necessary to provide a temporary reverse drive 35 clutch member 46. The rod protrudes outwardly of the
casing and has a lever 60 ?xedly attached thereto. A
through the normal lawn mower driving train so that the
Bowden cable 62 is attached to the outer end of the lever.
starter may be wound.
The shaft 40 extends outwardly of the deck structure
Accordingly, the object of my invention is to provide,
of the mower at each side thereof as shown in FIGURE
in connection with a self-propelled lawn mower or similar
vehicle, an engine starter of the mechanical stored energy 40 2. Rotatably mounted on the ends of shaft 46 are drive
pinions 64 which mesh with internal gears 66 carried by
type wherein the energy storing spring is wound by push
.drive wheels 14. The pinions 64 are provided with over
ing the mower, and in which the normal driving train of
This invention relates to starters for internal combus~
tion engines, particularly small engines of the type used
the mower is not interfered with.
hanging ratchet members 68 (see FIGURE 5) which
are engageable by the pawls 70 to provide a one way
‘For an understanding of my invention, reference is
made to the accompanying drawings which, taken in con 45 drive of the wheels 14 as is more or less standard in lawn
mower drives. Fastened to each overhanging ratchet
junction with the following speci?cation, disclose a pre
element is a washer-like element 72 provided with open
ferred embodiment thereof.
ings 74. Slidably mounted on the shaft 40 near each
In the drawings, in which like reference characters
end are clutch members 76-73. The right hand clutch
have been used to designate like parts referred to below:
FIGURE 1 is a plan view of a typical rotary lawn 50 member (as seen in FIGURE 2) is drivingly connected
to the shaft 40 by a pin 8% which engages the slot 82 in
mower in which my invention has been incorporated;
the shaft. The clutch member 76 is cut out at its outer
FIGURE 2 is an enlarged partial plan view of the
end so as to provide axially projecting teeth 84 which
driving end of the mower with certain parts broken away
engage the slots 74 when the clutch member is in engaged
to show details;
or drive position as shown in FIGURES 2 and 5.
FIGURE 3 is a cross-sectional view taken along the
The clutch member 76 is engaged by a shifter fork
line 3-3 of FIGURE 2;
86 which is carried. by the outer end of shifter rod 88
FIGURE 4 is an enlarged detail of the reverse drive
(FIGURES 2 and 4). The rod 83 is slidably mounted in
train taken along the line 4-4 of FIGURE 3;
a casing 94} carried underneath the deck 10. The inner
FIGURE 5 is a cross-sectional view taken along line
end of the shifter rod 88 is provided with helical teeth
5-5 of FIGURE 2;
92 which mesh ‘with the teeth of an idler pinion 94. The
FIGURE 6 is a cross-sectional view taken along line
latter, in turn, engages helical teeth 96 on a short shifter
6-6 of FIGURE 2;
rod 98. A collar 87 surrounds shifter rod 88 and is
FIGURE 7 is a cross-sectional view taken along line
pinned thereto by pin 89. Another collar 91 surrounds
7-7 of FIGURE 2;
FIGURE 8 is a cross-sectional view taken along line 65 shifter rod 88 and is fixed to casing 90. Between collars
87 and 91 is a coiled compression spring 93 which con
8-8 of FIGURE 3;
stantly urges rod 91 to the right and rod ‘)8 to the left
FIGURE 9 is a cross-sectional view taken along line
9-9 of FIGURE 3;
through the rack and pinion action of teeth 92 and 96
and
FIGURE 10 is a cross-sectional view taken along line
10-10 of FIGURE 3;
70 100
FIGURE 11 is a cross-sectional view taken along line
78.
11-11 of FIGURE 3;
the
pinion 94. The shifter rod 98 carries a shifter fork
which engages a collar 102 carried by clutch member
A coiled compression spring 1014 is disposed between
collar and an abutment ring in the clutch member
3,063,437
A
3
and functions to engage the clutch member after slight ro
tation of the parts, should the clutch teeth be blocked
groove 182. The groove contains a generally semi-circu
lar arm 184 pivotally connected to the hub of the sprocket
against ~engagement. The clutch member is otherwise
by pin 186. The arm 184 has formed integrally therewith
a dog 188 which at certain times engages with teeth
slmilar in construction to clutch member 78 and the de
scription will not be repeated.
174 as will more fully appear, later. The other end of
arm 184 has an upstanding pin 190 ?xed thereto. This
vpin extends upwardly through an arcuate slot 192 cut
From the description so far, it will be seen that with
clutch members 76, 78, disengaged (they are shown en
through the sprocket 178. Surrounding pin 190 is a
gaged) and the clutch member 46 engaged, the engine
coiled compression spring 194 which engages arm 184
can drive the wheels 14 through pulley 22, belt 24, pulley
26, shaft 28, gears 36 and 38, clutch members 42 and 10 at one end and the under side of arm 130 at the other end
(see FIGURE 3). The spring 194 acts as a brake on arm
46, ratchet 70, pawls 72 and gears 64 and 66. The drive
184 as will more fully appear later.
is a one way drive (forward) which facilitates steering
Having now described the various parts of the inven
of the mower and permits the mower to be pushed manu
tion, its operation will now be described. To start the
ally with clutch teeth 48-50 engaged. This is the normal
engine, the Bowden ‘wire 62 is pushed, which rotates lever
position while mowing.
60 moving shifter fork 56 to disengage clutch member 46.
Referring now to FIGURES 2, 3 and 10, it will be seen
This frees drive shaft 40 permitting it to rotate freely.
that a housing 106 carried in a cantilever arm 108 is
Bowden wire 136 is then pushed and through the medium
disposed beneath the plane of the deck adjacent the hous~
ing 34. The housing encloses a spiral coiled spring 111)
of rollers 142, bracket 146, boss 162 and pin 164, the
which is fastened at its inner end to a vertical shaft 20 cantilever arm 108 and housing 106 are moved so that
gear 122 engages worm 124 on shaft 40. At the same time
112 by a pin 114, while its outer end has a tab 116 ?xed
in a slot in the housing. The shaft 112 has a sprocket
cam surface 150 on arm 148 moves away from roller 152
permitting the shifter rod 88 to move to the right and
118, preferably formed integrally therewith. The lower
end of shaft 112 has a portion 120 of reduced diameter to
shifter rod 98 to move to the left (as viewed in FIGURE
2) under the action of spring 93. This action moves
which is fastened a worm wheel 122. The latter is adapt
clutch members 76-—78 locking the pawls 70 so that by
pushing the lawn mower forward, the drive wheels will
turn the gears 64 and the drive shaft 40.
ed to mesh with a worm 124 out into shaft 40.
The arm 108 is pivotally connected to the top of hous
ing 34 by a bolt 126. The arm is also attached to hous
ing 34 by bolt 128, which is threaded into the housing
Rotation of drive shaft 40 turns worm 124 and gear
122 meshed therewith, winding spring 110. When the
spring 118 is fully wound, its resistance will stop rota
tion of drive wheels 14, indicating that the spring 110
and secures to the housing a substantially S-shaped arm ,
130, the purpose of which will appear presently. The
arm 108 has an arcuate slot 132 therein in which a spacer
134 is disposed (FIGURE 3) so that arm 130 can be
-
tightly clamped in place but am 108 can pivot a limited
amount about bolt 126. The slot 132 is long enough to
permit sufficient movement of housing 106 so that gear
122 can be moved into and out of engagement with worm
124. The disengaged position is normal when the mower
is wound.
Bowden wire 136 is then pulled. Rollers 142 move
against cam surface 168 swinging yoke 156 clockwise
slightly (as seen in FIGURES l3 and 15) releasing boss
162 from pin 164. Spring 172 pulls cantilever arm 108
e and housing 186 with gear 122 to release gear 122 from
worm 124. Simultaneously arm 148 and cam surface 150
The housing 106 is swung about pivot 126 by means 40 is pulled against roller 152 to force shifter rod 88 to the
is operating.
to a pin 138 carried at one end of a rod 140. Rotatably
mounted on the pin 138 are two rollers 142. The rod
140 is slidable in a bearing 144 in a bracket 146v pref
left and shifter rod 98 to the right (as viewed in FIGURE
2) to release pawls 70.
All of this action releases the coil spring 110 and it
starts to unwind. When it does so, it drives sprocket 118,
and through chain 180, sprocket 178 rapidly in a counter
clockwise direction (FIGURE 2). As sprocket 178 ro
tates, arm 184-, because of the retarding action of spring
ing 106.
erably formed integrally with the bottom cover of hous
This bracket has an arm 148, one edge of
174 in pulley ‘26 locking the two together. The energy of
which is beveled to form a cam surface 150 (FIGURE '
the spring is thus transmitted through belt 24, pulley 22
2) which contacts a roller 152 carried in a slot 154 in
shifter rod 88. The arm 148 extends into the slot 154.
A yoke 156 is pivoted on shaft 40 beneath housing
as the engine is started, it drives pulley 26 through belt
of a Bowden wire 136 which, together with Bowden wire
62, leads to the handle bar (not shown) of the mower.
Referring now particularly to FIGURES 10, 12 and
13, it'will be seen that the Bowden wire 136 is attached
106 and is held against longitudinal movement by means
of washers 158 and pins 160. The yoke surrounds gear
‘122. On the yoke and extending toward the housing
194 rubbing on arm 130, causes dog 188 to engage a tooth
and crankshaft 21} to the engine to start the same. As soon
24. This will cause arm 184 to swing upward and release
dog 188 from teeth 174 permitting-spring 110 to com
pletely unwind, if it has not already done so.
Bowden wire 62 is then pulled permitting spring 52 to
force clutch teeth 48 and 50 into engagement whereby
106 is a boss 162. Extending from the housing 106
toward the boss is a pin 164. The purpose of these will
the engine can drive shaft v40 which in turn drives wheels
be shown presently.
14 in a forward direction in the normal manner.
Attached to the yoke 156 and extending out from one 60
side thereof is an arm 166 having an inclined cam sur
From the foregoing, it will be seen that this invention
provides a positive mechinism for starting small engines
on lawn mowers and the like, wherein the engine drives
not only the cutter but the mower itself, and eliminates
the laborious hand pulling on a cord or cable wound
deck 10. This spring constantly urges yoke 156 toward
around the ?ywheel as is usually the case. If the engine
housing 106. Another spring 172 is attached to deck
should not start in response to the ?rst try, the process
10 and housing 106, constantly urging gear 122 out of
above described may be repeated.
engagement with Worm 124.
While I have shown a speci?c embodiment of the
It will be noted in FIGURES 3 and 11 that pulley 26
invention as applied to a particular device, it will be
is hollow and is provided with radially inwardly extend
ing teeth 174. This is a part of a mechanism for trans 70 understood that this has been done for illustrative pur
poses and it is not to be understood as limiting the appli
mitting the energy of spring 110 to the engine to start
cation or the scope of the invention.
the same. Surrounding shaft 28 is a sleeve 176. Loose
I claim:
1y mounted around the sleeve 176 is a sprocket 178 which
face 168 with which rollers 142 are in contact. A spring
170 is attached to the free end of arm 166 and to the
is connected to sprocket 118 by a chain 180. Sprocket
178 has a rather large hub in which is formed. an annular
1. A power driven vehicle including a frame, an en
gine on said frame, said engine having a crankshaft, drive
5
3,068,437
wheels supporting said frame, said drive wheels having
to the engine crankshaft for imparting the energy stored
internal gears therein, a drive shaft on said frame, a drive
in the spring to the engine to start the same.
5. A power driven vehicle including a frame, an engine
on said frame, said engine having a crankshaft, drive
train including disengageable drive transmitting means
connecting said crankshaft to said drive shaft, drive gears
rotatably mounted on the ends of the drive shaft, mesh
wheels supporting said frame, said drive wheels having
ing with said internal gears, means on the drive shaft
internal gears therein, a drive shaft on said frame, a drive
engaging the gears thereon for driving the latter in a for
train including disengageable transmitting means connect
ward direction only, means movable axially of said
ing said crankshaft to said drive shaft, drive gears rotat
drive shaft for positively connecting the drive gears to
ably mounted on said drive shaft and meshing with said
the shaft whereby movement of the wheels will turn the 10 internal gears, means on the drive shaft engaging the
shaft, a coil spring on the frame, a spring winding train
internal gears for driving the wheels in a forward direc
for connecting the drive shaft to the spring for winding
tion only, a coil spring on the frame, a spring winding
said spring, said winding train including a releasable
train for connecting the drive shaft to the spring for
clutch mechanism, and means for connecting the spring
winding the same, and mechanism for selectively simul
to the engine crankshaft for imparting the energy stored 15 taneously connecting the spring winding train to the drive
in the spring to the engine to start the same.
shaft and for positively connecting the drive gears to the
2. A power driven vehicle including a frame, an engine
wheels or for simultaneously disconnecting said positive
on said frame, said engine having a crankshaft, drive
drive and releasing the spring winding train, and means
wheels supporting said frame, said drive wheels having
for connecting the spring to the engine crankshaft upon
internal gears therein, a drive shaft on said frame, a drive 20 release of the spring winding train for imparting the
train including disengageable drive transmitting means
energy stored in the spring to the engine to start the
connecting said crankshaft to said drive shaft, drive gears
latter.
,
rotatably mounted on said drive shaft and meshing with
6. A power driven vehicle including a frame, an engine
said internal gears, means on the drive shaft engaging
the gears for driving the same in a forward direction only, 25 on said frame, said engine having a crankshaft, drive
wheels supporting said frame, said drive wheels having
means for positively connecting the drive gears to the
internal gears therein, a drive shaft on said frame, a
drive shaft whereby movement of the wheels in a forward
drive train including disengageable drive transmitting
direction will turn the shaft, a coil spring on the frame,
means
connecting said crankshaft to said drive shaft, drive
a spring winding train for connecting the drive shaft to the
gears
rotatably
mounted on the ends of the drive shaft
spring for winding the spring and mechanism for selec
tively simultaneously connecting the spring winding train
30 and meshing with said internal gears, means on the drive
to the drive shaft and for positively connecting the drive
gears to the wheels.
3. A power driven lawn mower including a frame, an
shaft engaging the gears thereon for driving the latter
in a forward direction only, a coil spring on the frame, a
spring winding train for connecting at least one of said
engine on said frame, said engine having a crankshaft, 35 drive wheels to the spring for winding said spring, said
winding train including a releasable clutch mechanism,
drive wheels supporting said frame, a driving train in
and means for connecting the spring to the engine crank
cluding a drive shaft connecting said engine to said drive
shaft for imparting the energy stored in the spring to the
wheels for driving the same in a forward direction only,
engine to start the same.
disengageable drive transmitting means in said driving
7. A power driven vehicle including a frame, an en
train between the engine and the crankshaft for discon 40
gine on said frame, said engine having a crankshaft, drive
necting the engine from said drive shaft, a coil spring on
wheels supporting said frame, said drive wheels having
said frame, means for connecting said drive shaft to said
internal gears therein, a drive shaft on said frame, a
spring, means for positively connecting said drive shaft
drive train including disengageable drive transmission
to the drive wheels when the engine drive is disconnected
means
connecting said crankshaft to said drive shaft,
whereby rotation of the wheels will turn the drive shaft, 45
drive gears on the ends of said drive shaft meshing with
means connecting the spring to the crankshaft, and means
the gears in the drive wheels, means connecting the drive
for releasing the energy stored in the spring to the crank
gears to the shaft for rotation by the shaft in a forward
direction only, a coil spring on the frame, a spring wind
on said frame, said engine having a crankshaft, drive 50 ing train for connecting the drive shaft to at least one
shaft to turn the same to start the engine.
4. A power driven vehicle including a frame, an engine
wheels supporting said frame, said drive Wheels having
internal gears therein, a drive shaft on said frame, a drive
of said drive wheels for winding said spring by rotation
of said wheel, said winding train including releasable
drive transmitting means, and means connecting the
train including disengageable drive transmitting means
spring to the engine crankshaft for imparting the energy
connecting said crankshaft to said drive shaft, drive gears
on the ends of said drive shaft meshing with the gears in 55 stored in the spring to the engine to start the same.
the drive wheels, means connecting the drive gears to the
shaft for rotation by the shaft in a forward direction only,
means on said drive shaft for positively connecting the
drive gears to the shaft whereby movement of the wheels
will turn the shaft, a coil spring on the frame, a spring 60
winding train for connecting the drive shaft to the spring
for winding said spring, said winding train including a
releasable clutch means, and means connecting the spring
References Cited in the ?le of this patent
UNITED STATES PATENTS
932,735
1,031,134
1,130,059
2,384,728
Willard ______________ __ Aug. 31,
Markmann et al ________ __ July 2,
Brewer _______________ __ Mar. 2,
Crumble ____________ __ Sept. 11,
1910I
1912
1915
1945
Документ
Категория
Без категории
Просмотров
0
Размер файла
828 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа