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Патент USA US2118768

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ay 24, 1938.
' -
Filed Jan. 16, 1937
Patented May 24, 1938
2,118,768 I
Youston Sekella, Elmira, N. Y., assignor to Eclipse
Machine Company, Elmira, N. Y., a corpora
tion of New York
Application January 16, 1937, Serial No. 120,947
4 Claims.
shaft 6. Longitudinal movement of the screw
shaft 6 on the sleeve 2 is limited in one direc
tion by the shoulder ‘l at‘ the end of the reduced
matically traversed into and out of engagement
portion 5 thereof, and in the other direction by
5 with a member of an engine to be started.
securely retained thereon by “staking” or ex
panding portions 9 of the end of the sleeve into
closed in the patents to McGrath 2,017,566 and
Sekella 2,062,430, where the longitudinal move
castellations ii in the end of the stop nut 8.
A pinion i2 is freely journalled on the power.
shaft I and is connected by a barrel member l3
to a nut 84 threaded on the screw shaft 6, said
unscrewing and pulling loose by riveting or
“staking” it in place. While this method of
15 fastening the stop nut has been found commer
cially efficacious, it has the disadvantage that re
moval of the stop nut for the purpose of dis
assembling and servicing the drive is rendered
difficult without the use of special tools for that
It is an object of the present invention to pro
vide a novel barrel type starter drive in which
the parts are effectively locked in operative rela
tion, but may readily be disassembled for inspec
25 tion or service.
a stop nut 8 threaded on the end of the sleeve and
In those forms of starter drives known com
mercially as the “barrel type drives”, such as dis
10 ment of a nut on a screw shaft is limited by an
abutment in the form of a stop nut, it has been
found advantageous to retain the stop nut from
(Cl. 74-7)
The present invention relates to an engine
starter drive and more particularly to that form
of drive in which a motor-actuated pinion is auto
nut being provided with lugs I5 extending radially
into slots it in the barrel and being retained
therein by means of a split lock ring i1.
Means are provided for yieldably connecting 15
the screw shaft 6 to the sleeve 2 in the form of a
torsion and compression spring it having out
turned ends 19 and 2| engaging in slots in anchor
ing members in the form of discs 22 and 23 re
spectively non-rotatably connected to the screw 20
shaft and sleeve as by means of non-circular
openings in said anchoring discs conforming 'to
non-circular portions of the screw shaft and
sleeve (Fig. 3).
Longitudinal movement of the anchor member 25
It is another object to provide such a device in
22 on the screw shaft is limited by a shoulder 24
which the drive spring and its associated parts
may be disassembled without disassembling the
barrel and stop nut.
formed thereon, and longitudinal movement of
the anchor member 23 on the sleeve under the
expansive action of spring 18 is limited by a split
It is a further object to provide such a device
lock ring 25 seating in a groove 26 in said sleeve
in which the spring and its associated parts may
be assembled and removed from one end of the
drive assembly while the barrel and its associated
parts are assembled from the other end.
It is another object to provide such a device
in which the anchoring means for the drive spring
is positive in action but readily removable With
out special tools.
Further objects and advantages will be appar
~10 ent from the following description taken in con
nection with the accompanying drawing in which:
Fig. l is a side elevation partly broken away
and in section of a preferred embodiment of the
Fig. 2 is an end view thereof; and
Fig. 3 is a detail in perspective of the mount
ing sleeve and spring anchoring member partly
broken away.
Referring ?rst to Fig. l of the drawing, there
is illustrated a power shaft l which may be the
extended armature shaft of a starting motor, not
illustrated. A mounting sleeve 2 is ?xed on the
power shaft as by means of a key 3 (Fig. 2) and
pin #3 and is provided with a reduced smooth por
tion 5 on which is slidably journalled a screw
and projecting therefrom, as best illustrated in
Fig. 3, to form an abutment for the anchor
In the operation of the device, rotation of the
power shaft I is transmitted through the sleeve 35
2, anchor member 23, spring l8, and anchor mem
ber 22 to the screw shaft 6, causing rotation
thereof in unison with the power shaft. Ac
celeration of the screw shaft 6 causes the nut M
to thread itself along the shaft into engagement 40
with the stop nut 8, thus moving the pinion l2
longitudinally into engagement with a member,
not illustrated, of an engine to be started. Longi
tudinal motion of the nut 14 being arrested, and
rotation of pinion 42 being resisted by its engage as5
ment with the engine member, the screw shaft
6 is constrained to move back, compressing the
spring I8 until stopped by the shoulder 'l on the
sleeve, whereupon a yielding driving connection
through the spring l8 to the pinion I2 is estab
lished for cranking the engine. When the engine
starts, the overrunning action of the engine re
turns the pinion I2 and screw shaft 6 to their idle
positions, as illustrated, in the usual manner.
A thrust washer 2‘! is preferably interposed be
tween the shoulder ‘I and the end of screw shaft 6.
It will be readily appreciated that by virtue of
the removability of the lock ring 26 for the an
chor member 23, said anchor member, the spring
l8 and anchor member 22 may all be readily dis
assembled Without disturbing the stop nut 8 or
removing the screw shaft 6. Since the barrel l3
,and pinion I2 may also be disassembled upon re
10 moval of the lock ring I1, it will be seen that all
these components of the drive may be removed
for inspection or service without having to loosen
the stop nut B.
Although but one form of the invention has
been shown and described in detail, it will be
understood that other embodiments are possible
and various changes may be made in the con
struction and arrangement of‘ the parts without
departing from the spirit of the invention as de
?ned in the claims appended hereto.
What is claimed is:
1. In a starter drive for internal combustion
engines, a mounting sleeve, a hollow screw shaft
slidably journalled thereon, said sleeve having a
stop member ?xed thereto for limiting the lon
gitudinal movement of the screw shaft thereon,
means for yieldably connecting the screw shaft
to the sleeve including a compression and torsion
spring, an anchor member connecting one end
of the spring to the screw shaft, an anchor mem
ber for the other end of the spring slidably and
non~rotatably mounted on the sleeve, a remov
able locking ring for the latter anchor member
seated in said sleeve, and means for transmitting
rotation from said screw shaft to a member of an
engine to be started.
2. In a starter drive for internal combustion
engines, a sleeve, a hollow shaft slidably jour
nalled thereon, said sleeve having a stop mem
ber ?xed thereto for limiting the longitudinal
movement of the shaft thereon, means for yield
ably connecting the shaft to the sleeve including
a compression and torsion spring, an anchor
member connecting one end of the spring to the
shaft, an anchor member for the other end of
the spring in the form of a disc having a non
circular bore slidably ?tting a non-circular part Ol
of the sleeve, said sleeve having a peripheral
groove, and a split lock ring seated in the groove
con?ning the anchor member on the sleeve.
3. In an engine starter drive, a sub-assembly
unit including a barrel member, a pinion ?xed 10
On one end thereof, a nut member non-rotatably
mounted in the other end thereof, and a screw
shaft on which said’ nut is threaded in combi
nation with a yielding driving connection for
the screw shaft including a sleeve carrying said 15
screw shaft and having abutments limiting the
travel of the screw shaft thereon, a coiled spring
and slidable collars receiving and anchoring the
ends of the spring to the sleeve and screw shaft
respectively, and a split locking ring forming a 20
removable abutment for the anchoring collar on
the sleeve.
4. In an engine starter drive, a hollow drive
shaft having a non-circular enlarged portion at
one end forming an abutment shoulder, and a H
stop member ?xed to the other end, a screw shaft
journalled on the drive shaft and longitudinally
movable thereon between the shoulder and stop,
said screw shaft having an enlarged non-circular
portion at its end adjacent the corresponding
portion of the drive shaft, anchor members slid
ably but non-rotatably mounted on the enlarged
portions of the driving and screw-shafts, a tor
sion spring connecting said anchor members, said
enlarged portion of the drive shaft having a pe- ‘
ripheral groove, and an annular abutment mem
ber removably seated in said groove engaging the
adjacent anchor member and thereby serving to
retain the spring and anchor member assembly
on the drive shaft.
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