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Патент USA US2117999

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May 17, 1938.
‘M, P_ WHITNEY
2,117,999
ENGINE STARTER DRIVE
Filed Jan. 27, 1937
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Patented May 17, 1938
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STATES
PATENT‘ oFFICES '
2,117,999
ENGINE STARTER DRIVE
Maurice P. Whitney, Elmira, N. Y., assignor to
Eclipse Machine Company, Elmira, N. Y., a cor
poration of New York
Application January 27, 1937, Serial No. 122,580
3 Claims.
The present invention relates to engine starter
rotatably connected to an enlarged portion 9 of
drives and more particularly to an improved
the screw shaft and seating against a shoulder I I
thereon. The other end of the spring" is
anchored to the sleeve I by means of a similar
anchor member I2 n'on-rotatably mounted on an
fastening arrangement for retaining the parts
5
of the drive in assembled relation.
Engine starter drives as articles of commerce
are usually in the form of a unit adapted to be
mounted on the extended armature shaft of a
enlarged portion‘ I0 of the sleeve and adapted
to bear against a split thrust ring l3 seated in
starting motor, and incorporate means for so
a groove I4 in the sleeve.
locating the drive thereon that when the starting
10 motor is mounted in its intended position, the
drive pinion will be in proper position to engage
and cooperate with a gear on a member such as
the ?ywheel of the engine to be started. Thus
in the form of starter drive disclosed in the patent
15 to Sekella 2,062,480, the elements of the drive
are assembled on a sleeve which is located on a
motor shaft by means of a pin and key.
It is an object of the present invention to
provide a novel starter drive assembly which
forms a unitary article of commerce especially
Locating and retaining means for the sleeve on
the motor shaft 6 is provided in the form of 10
a pin I5 slidably mounted in a radial aperture
I6 (Fig. 3) in the sleeve and adapted to extend
inwardly into an opening in the shaft as indicated
in dotted lines in Fig. 2, being retained in such
position by the anchoring member I2 when the
drive is mounted on the motor shaft. A key I‘!
(Fig. 2) of standard construction is preferably
provided for non»rotatably connecting the sleeve
to the motor shaft when mounted thereon.
When the drive is assembled for shipment, the 20
adapted for easy and rapid mounting and attach
pin I5 is held in withdrawn position and the parts
ment to a motor shaft.
so retained thereby as to facilitate mounting on
the motor shaft. As here illustrated, this is ac
It is another object to provide such a device
including novel means for locating and retaining
the drive on the motor shaft.
It is a further object to provide such a device
embodying special provisions for preventing the
locating and retaining means from becoming
dislodged by handling or vibration of the drive
in shipment and distribution.
Further objects and advantages will be appar
ent from the following description taken in con
nection with the accompanying drawing in
which:
-
Fig. 1 is a side elevation partly in section of
a starter drive embodying the present invention;
Fig. 2 is an end view from the left in Fig. 1; and
Fig. 3 is an enlarged sectional detail showing
the parts as they are assembled in the drive for
40 shipment.
Referring to the drawing, there is illustrated
in Fig. 1 a barrel type drive of the type disclosed
in the patent to Sekella cited including a sleeve
I on which is slidably J'ournalled a screw shaft
45 2 having a nut 3 threaded thereon. The nut 3
is rigidly connected by means of a barrel 4 to a
pinion 5 which is adapted to slide freely on the
extended armature shaft 6 of a starting motor
and to be moved by said nut and barrel into and
50 out of engagement with a member, not illustrat
ed, of an engine to be started.
The sleeve and screw shaft are yieldably con
nected by means of torsion and compression
complished by making the opening I6 in the
sleeve slightly larger than the pin I5 and by 25
forming a
shallow circumferential
recess
or
groove I8 adjacent the outer end of the pin.
When the parts are assembled, the spring ‘I is
compressed sufficiently to permit the anchor
member I2 to clear the opening I6 in the sleeve, 30
whereupon the pin I5 is inserted in said opening
and the spring ‘I permitted to expand. The ex
pansion of the spring forces the anchor member
I2 against the pin I5, causing it to tilt slightlyv
and bind in the opening I6 whereby it is held 35
?rmly against displacement due to handling or
vibration during shipment and distribution.
The anchor members 8 and I2 are formed
commercially as stampings, and when so formed,
there is a sharp edge or corner I9 left around its 40
central opening. The recess or groove I8 in the
pin I5 is formed to accommodate the edge I9 on
anchor member I2 (Fig. 3), forming therewith
an interlocking connection which further insures
against undesired dislodgment of the pin I5.
45
When the drive is to be mounted on a motor
shaft, it is merely necessary to place a key I‘! in
the shaft and then slide the drive on the shaft
until the pin I 5 registers with the opening in the
shaft. The pin I5 is then forced into said open
ing,» whereupon the spring ‘I expands and moves
the anchor member into the position illustrated
in Fig. 1 where the parts are all locked in posi
drive spring ‘I anchored at one end to the screw . tion.
Although but one embodiment of the invention 55
55 shaft 2 by means of an anchor member 8 non
2
7
2,117,999
has been shown and described in detail, it will be
understood that other embodiments are possible
and various changes may be made in the arrange
ment of the parts without departing from the
spirit of the invention as de?ned in the claims
appended hereto.
What is claimed is:
a
1. In a starter drive, a sleeve adapted to be
mounted on a motor shaft, a screw shaft slid
ably journalled on the sleeve, means transmitting
rotation from the sleeve to the screw shaft in
cluding a torsion and compression spring and an
anchor member therefor slidably but non-rotat
ably mounted on the sleeve, and means including
a pin loosely mounted in the sleeve and adapted
to serve as an abutment for said anchor member
to limit the expansion of the spring, said pin and
anchor member having interengaging portions
serving to resist displacement of the pin.
2. In an engine starter drive, a sleeve, a hollow
shaft slidably journalled thereon, a stop member
on the sleeve limiting sliding movement of the
shaft in one direction, a drive spring, means
anchoring one end of the spring to the shaft,
slidable means non-rotatably connecting the
other end of the spring to the sleeve, and a pin
loosely mounted in the sleeve adapted to engage
said slidable means to hold the spring under com
pression, the expansive force of the spring serv
ing to bind the pin in the sleeve and resist dis
lodgment thereof.
3. In an engine starter drive, a sleeve, a hollow
shaft slidably journalled thereon, a stop mem 10
ber on the sleeve limiting sliding movement of the
shaft in one direction, a drive spring, means
anchoring one end of the spring to the shaft,
slidable means non-rotatably connecting the
other end of the spring to the sleeve, and a pin 15
loosely mounted in the sleeve adapted to engage
said slidable means to hold the spring under com
pression, said pin having a recess and said slid
able means having a portion adapted to engage in
said recess under the expansive force of the 20
spring and resist dislodgment of the pin.
MAURICE P. WHITNEY.
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