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Патент USA US3093222

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June 11, 1963
R. E_ McAFEE ErAL
3,093,212
MOTOR VEHICLE LOCK DEVICE
Filed Sept. 6, 1960
5 Sheets-Sheet 1
54
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June 11, 1963
R, E, MGAFEE ETAL
3,093,212
MOTOR VEHICLE LOCK ‘DEVICE
Filed Sept. 6. 1960
3 Sheets-Sheet 2
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June 11, 1963
3,093,212
R. E. MGAFEE ETAL
MOTOR VEHICLE Locx -DEvIcE
Filed Sept. 6, 1960
5 Sheets-Sheet 3
69
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United States Patent O ” ICC
3,093,212
Patented June 1-1, 1963
2
3,693,212
MÜTÜR VEHICLE LOCK DEVICE
Robert E. McAfee and Henry K. Arnold, Fort Wayne,
Ind., assignors to International Harvester Company,
Chicago, Ill., n corporation of New Jersey
Filed Sept. 6, 1960, Ser. No. 54,280
18 Claims. (Cl. 18S-69)
This invention relates .to a motor vehicle parking lock
or brake device and more particularly to an improved 10
structure is broken away to better illustrate the invention;
FIGURE 3 is an enlarged end elevational view of the
toggle mechanism for controlling the operation of the
locking pawl;
FIGURE 4 is a View similar to FIGURE 1 with the
exception that the locking device is illustrated in its disen
gaged or released condition; and
FIGURE 5 is a sectional View taken substantially along
line 5_-5 of FIGURE 2.
Referring to the drawings in detail wherein like refer
ence characters represent like elements` throughout the
or drive shaft of the motor vehicle to prevent accidental
various views, the end portion of -a transmission casing
forward and rearward motion of the vehicle when parked.
10 is partially shown. A drive or propeller shaft, not
It has become a common practice to provide a positive
shown, extends rearwardly from the transmission casing
type as ydistinguished from a friction type releasable lock 15 10 and is operatively connected -to the vehicle drive wheels
device »for a motor vehicle equipped with an automatic or
in a conventional manner. The propeller shaft is adapted
semi-automatic transmission which is conditionable to pre
to rotate whenever the vehicle is in motion. In the present
vent accidental movement of the vehicle when left unat
invention la drum 11 is rigidly keyed or otherwise suitably
tended. While the primary function of a releasable lock
secured to the propeller shaft. The drum 11 has an axially
device of the type to which the present invention relates is
extending cylindrical portion 12 on Iits outer periphery.
to restrain vehicle movement when the vehicle is parked
A ring-like member 13 is rigidly secured to the drum 11 by
and left unattended it must be readily engageable and dis
means of a plurality of rivets 14 (one of which is shown
engageable under all conditions in order to be etlìcient.
in FIGURE 1). The ring-like member §13 has a cylin
It is therefore a primary objective of the present invention
drical portion `15 which overlaps the cylindrical portion l12
to provide a positive type -releasable lock device for a 25 of the drum 11. The cylindrical portion 15 of the ring
motor vehicle which requires very little e?ort on the part
like member 15 is provided with a plurality of circumferen
of the vehicle operator to- operate.
tial-ly spaced axially extending slots therethrough. 'Il-he
A still further object is the provision of a unique toggle
surfaces 17 defining the axially extending sides of each
mechanism for moving a locking pawl or dog into and out
slot y1’7 converge as they extend radially inwardly as best
of engagement with a tooth member carried by the vehicle 30 shown in FIGURE 2. rIlle purpose of inclining the side
propeller shaft.
surfaces 17 of the lslots 16 will be pointed out hereinafter.
Another object is the provision of means to guard
A supporting structure including a pair of axially spaced
against the possibility of the locking dogs from «being disen
and parallel plates 18, 19‘ are rigidly connected to the end
gaged when the propeller shaft is subjected to a force tend
wall Ztl of the transmission casing 10 by means of a plu
ing to rotate the same as occurs when the vehicle is parked 35 rality of ybolts 21, one of which is `shown in ÁFIGURE 1.
on a hill or the like.
One leg 2,2 of a substantially L-shaped bracket 23 is
A still further object is the provision of an improved
rigidly secured to an outer peripheral edge portion of the
yieldable or resilient means, under control of the vehicle
supporting plate 18 by means of rivets 24 -or the like. The
operator, for urging the lock pawl into engagement ywith
other leg 25 of the bracket 23 extends axially rearwardly
the output or drive shaft gear teeth regardless of whether 40 land is radially spaced outwardly from the cylindrical por~
the pawl is in registration with -the teeth of the gear or
tion 15 of the ring-like member 13. As best shown in
not in order to prevent the operator from forcefully jam~
FIGURE 2 a radially extending tab 25 is integrally for-med
ming and breaking the various parts of the pawl when it
with a portion of the bracket leg 25. The integrally
is not in registration with the space between a pair of
formed tab `26 is axially spaced and parallel to a leg 27
45 of a substantially L-shaped member 28 which has its
adjacent gear teet-h.
A further object is the provision of an anti-friction
other leg 29 rigidly secured as by welding »or the like to
roller carried by the pawl which is engageable with the
the radially outermost surface'of the leg 25 of bracket
toothed member fixed to the propeller shaft whereby the
23. The tab 26 `and leg 29 carry an axially extending
pawl may be readily moved out of engagement with the
pivot pin `30. One end of a locking pawl 31 is journalled
toothed member with very little effort on the part of the
on the pivot pin 3i).
vehicle operator even though the vehicle is parked on an
The end of the locking pawl 31 opposite the end con
incline extending either forwardly or rearwardly and the
nected to the pivot pin 30 is grooved to provide a pair
propeller shaft is under load which tends to bind or retain
of parallel arms 32 which carry a cylindrical bear-ing 33.
the pawl in engagement with the toothed member.
A cylindrical roller 34 disposed between the larms 32 is
Still another object is the provision of adjustable means 55 rotatably supported on the bearing 33. The locking
for varying the magnitude of the yieldable force main
pawl 31 is adapted to pivot :about the longitudinal axis
taining the pawl in «locking engagement with the toothed
of pivot pin 30 to cause the roller 34 to be moved into
member and the `operating lever in a position correspond
land out of a position wherein it is >disposed within a
ing to the pawl-engaged position.
slot 16 :and engages the cylindrical portion 12 of the
60
The foregoing and other important objects and desirable
.drum 11 illustrated in FIGURE 2.
features inherent in and encompassed by the invention
From the foregoing it will be appreciated that when
together with many of the purposes and uses thereof will
the roller 34 is disposed within a respective slot 16 be
become readily apparent yfrom a reading of the ensuing
tween a pair of adjacent -teeth 35 partially defining the
description in conjunction with the annexed drawings, in
slot and is maintained in meshing engagement with the
65
which:
teeth the drum 11 is incapable »of rotating with respect
FIGURE l is a longitudinal vertical sectional View of a
to the .transmission casing 10.
positive type releasable locking device embodying the
Resilient means are provided for yieldably urging the
invention mounted on the rearwardmost end of a motor
pawl 31 in -a Idirection to effect disengagement fof the roller
vehicle transmission housing;
70 34 with the teeth 35 of the ring-like member 13 :and in
FIGURE 2 is an end elevational view of the releasable
cludes a cylindrical plug 36 which is slidably mounted
locking device illustrated in FIGURE 1, a portion of the
in a recess 37 formed in the locking pawl 31 intermediate
releasable lock device for positively engaging the propeller
3,093,212
4
the ends thereof. The plug 36 has a central cylindrical
cavity extending from one end thereof and a helically
wound compression spring 38 is adapted to have one end
bear against the surface defining the bottom of the cav
ity and its opposite end seated on the surface of the pawl
of the cylindrical member 62. The enlarged head 66 of
the bolt 63 is adapted to engage the plate 60 to limit
sliding movement of the cylindrical member 62 in one
direction. A spring housing 67 is provided which is in
the form of a pair of cup-shaped elements 68, 69. The
deñning the bottom of the recess 37. The plug 36 has
a semi-spherical end 39 which is resiliently urged lby the
closed end of each cup-shaped element 68, 69 is provided
with a circular opening therethrough through which the
cylindrical member 62 is adapted to extend. The annular
spring 38 into engagement with the outermost surface
of »the bracket leg 25. From the foregoing it will be
appreciated that the locking pawl 31 is continually urged
portion of the closed end of cup-shaped member 69 is
adapted to bear against a radially extending annular ilange
in a clockwise direction about the axis Áof pivot pin 30
70 integrally formed on the lowermost end of the cylin
as viewed in FIGURE 2.
drical member 62, as viewed in FIGURE 1.
It is to be understood that
The an
when the spring 38 `approaches its fully expanded condi
nular portion of the closed end of the cup-shaped element
68 encircling the opening therethrough is adapted to bear
tion as illustrated in FIGURE 4 the roller is out of mesh
ing engagement with the teeth 35 of the ring-like member 15 against the lowermost marginal edge of the annular
13 and is disposed radially outwardly of a circle contain
flange 61 andthe opened ends of the cup-shaped elements
ing the radially outermost surfaces of the teeth 35. The
68, 69 slidingly engage each other as illustrated in FIG
locking pawl 31 also carries a wear button 40 which
URE l. A bank of “Belleville” type spring washers or
springs 71 are enclosed by the spring housing 67 and are
has a threaded shank portion 41 and an enlarged head 42
provided with a semi-spherical surface 43. The shank 20 adapted to resiliently urge the cylindrical member 62
axially along the longitudinal axis of the bolt 63 away
portion 41 is adapted to be threaded in a threaded aper
ture 44 formed in the locking pawl 31. The longitudinal
from the plate 60. It will be noted that the bank of
springs 71 resiliently urge the enlarged head 66 of `bolt 63
axis of the threaded aperture 44 intersects the longitudinal
axis of the bearing 33 substantially at a right angle.
into abutting engagement with the plate 60 and when this
From the foregoing it will be appreciated that the wear 25 condition exists, the end 72 of the cylindrical member
62 opposite the tlange 70 is axially spaced from the under
button 44 may be readily replaced in the event the same
should become unduly worn or damaged in use without
side cf the plate 60. The purpose of providing clearance
the necessity of replacing the entire locking pawl 31.
between the cylindrical member 62 and the plate 60 will
The means for moving the locking pawl 31 into mesh
be pointed out hereinafter. From the foregoing it will be
ing engagement with the ring-like member 13 and for 30 appreciated that the cylindrical member 62 is capable for
maintaining the roller 34 in locking engagement with the
moving axially with respect to the plate 60 a distance
teeth 35 includes a toggle mechanism designated gen
equal to the axial spacing between the underside of the
erally by numeral 45. The toggle mechanism 45 includes
plate 60 and the end 72 of the cylindrical member 62
a supporting plate 46 which is rigidly secured to the
when the enlarged head 66 is abutting the plate 60.
plates 18 and 19 as by welding or the like. -Rigidly se 35
Adjustable means are provided for varying the effective
cured to the supporting plate 46 are a pair of spaced
length of the cylindrical member 62. The adjustable
brackets 47. The brackets 47 carry a pivot pin 48. One
end :of a lever 49 is disposed between the brackets 47
means includes a plug 73 which has a ñat face 74 adapted
to engage the semi-spherical surface Á43 vof the Wear button
and is journalled `on the pivot pin 48. The toggle mech
40. The plug 73 has exterior screw threads 75 formed
anism 45 also includes a pair of bellcranks 50 each of 40 thereon which are cooperable with the threads of an ax
which has an end portion of one arm 51 pivotally con
nected to the `brackets 47 by means of a pivot pin '52 ex
tending parallel to and spaced from the pivot pin 48. An
elongated pin 53 having its longitudinal axis parallel to
ially extending centrally located threaded recess 76
formed in the lowermost end of the cylindrical member
62, as viewed in FIGURE 1. It will be appreciated that
by rotating the plug 73 with respect to the cylindrical
the longitudinal axes of the pivot pins 48 and S2 extends 45 member 62 in one direction the axial spacing between
between the bellcranks 50 as shown in FIGURE 3. The
the flat face 74 of the plug and the end surface 72 of the
pin 53 provides a pivotal support for Ia pair of arms 54
cylindrical member 62 will be increased and, conversely,
which extend radially with respect to the longitudinal
when the plug 73 is rotated in the opposite direction the
axis of the pin 53. Pivot connecting means in the form
axial spacing between the ilat face 74 and the end surface
of a pivot pin 55 is utilized to interconnect the free end 50 72 of the cylindrical member 62 will be decreased.
of each arm 54 and a portion of the lever 49 intermediate
The actuating linkage for rocking the lever 49 to move
the ends thereof. Referring to FIGURE 1 it will be noted
the pawl roller 34 into engagement with -the gear teeth
that the lever 49 is formed with an intermediate olîset
35 of the ring-like member 13 and to permit disengage
section S6 whereby the longitudinal axes of the end sec
ment of the pawl roller 34 from the ring-like member 13
tions 57, ‘58 are spaced in parallel with respect to each 55 is not shown. It is to be understood, however, that such
other. It will also be noted that the curved edge 59 of
linkage includes a transmission shift control lever dis
the lever 49 partially defining the juncture of the offset
posed contiguous to the vehicle steering wheel and the
section 56 and the end section 58 is adapted to engage
same operating linkage -is used to manually control the
the elongated pin 53 -to limit pivotal movement of the
operation of the transmission. Thus movement of the
lever in one direction. It will also be noted that the 60 shift control lever to a particular position generally des
longitudinal axis of the pivot pin 55 crosses a plane con
ignated as a “par ” position effects movement of the lever
taining the longitudinal axes `of the elongated pin 53 and
49 to the position illustrated in FIGURE 1 and, converse
the pivot pin 48 as the lever 49 is rocked between the
ly, whenever the shift control levtr is in any other selected
positions shown in FIGURES 1 and 4.
position to establish different gear ratios in the transmis
Extending between and rigidly connected to the arms 65 sion the lever 49 is in the position illustrated in FIGURE
54 of Ibellcranks 50 is a plate 60. An annular ñange 61
4. Thus assuming that the vehicle has just come to rest
integrally formed with the plate 60 projects from a
the lever v49 will be in the position shown in FIGURE 4
mid-portion of the plate 60. The annular ñange 61
and the tlat face 74 of the plug 73 will be in engagement
serves as guide means for slidably receiving one end of a
with the semi-spherical surface 43 of the wear button 40.
cylindrical member 62. The cylindrical member 62 is 70 The bank of springs 71 will be expanded as will the pawl
operatively connected to the plate 60 by means of a bolt
`disengaging spring 38. As stated hereinbefore the resil
63 which has its threaded shank portion 64 extending
ient action of the bank of springs 71 causes the underside
loosely through an aperture 65 formed through the plate
of the enlarged head 66 to be pressed tirmly into engage
60 and into threading engagement with a threaded recess
ment with the uppermost surface of the plate 60 and
provided in the uppermost end, as viewed in FIGURE 1, 75 the resilient action of the spring 38 causes the locking
3,093,212
5.
pawl 31 `to be swung about the longitudinal -axis of pivot
pin 3l) in a direction to position the pawl roller 34 radially
outwardly of a circle containing radially outermost edges
of the teeth 3S of the ring-like member I3. It will be
appreciated that the resilient action `of the spring 33 tends
cylindrical member'62 with respect to the plate 60 result
ing in the enlarged head 66 of the bolt 63 being moved
out of engagement with the plate 60 is permitted but such
relative movement is -resiliently resisted by the bank of
springs 7l.
lConsequently the greater relative sliding
movement of the cylindrical member 62 toward the plate
about the longitudinal axis of the pivot pin 52 and the
d@ the greater will be the yieldable force developed by
the bank of springs 7l. Thus with the effective length
«lever 49 in a counterclockwise direction .about the longi
of the cylindrical member 62 properly adjusted in the
tudinal »axis `of pivot pin `43, :as viewed in FIGURE 4.
Now as the lever 49 is rocked in a clockwise direction, 10 manner pointed out hereinbefore and when the pawl 31
is in its gear-engaging position as shown in FIGURE l
ras viewed in FIGURE 4, the bellcranks 5€) will also rock
and the lever ‘49 is at its extreme limit of clockwise move
in :a clockwise direction causing the locking pawl 31 to
ment, the resilient force developed by the bank of springs
be pivoted in a direction to eífect commencement of
'7l is not impressed upon the lever 49 nor the lock pawl
movement ofthe pawl roller 34 radially toward the ring
3l. However, it is quite possible that with the propeller
like mem‘ber 13. It will be appreciated that to effect such
to notate the bellcranks Sti ina counterclockwise direction
movement of the locking pawl 31 requires compressing
the pawl disengaging spring 3S which is of considerably
lighter construction than the bank of springs 7l. Con
lshaft at rest the shift control lever may be actuated to
cause engagement of the pawl roller 34 with the ring-like
member 13 even though fthe pawl roller- 34 is not in
registration or in a position to mesh with the gear teeth
tinued rocking of the lever `49 in a clockwise direction
causes the pawl roller 34 to be lowered into meshing 20 35 and it may impinge `and abut the top or radially outer
most surface of one of the teeth 35 of the ring-like
engagement with the teeth 35 on the ring-like mem-ber
member I3 and thereby being prevented from positively
I3 by being pivoted about pivot pin 3d to thereby posi
tively -lock `the propeller shaft `against rotation and conse
locking the propeller shaft.
the curved edge 59, partially defining the offset section
prevented from moving radially inwardly to its gear-engag
ing position. However, since the bellcranks 50 .and the
When this occurs it is
obvious that the locking pawl 3ll is prevented from pivot
quently prevent accidental for other movement fof the
vehicle once it has assumed its 'gear-engaging position. 25 in-ff to the position shown in `FIGURE 2 and the cylin
drical member 62 which abuts the Wear button 40 is «also
When the pawl roller 34 is -in its gear-engaging position
55 of the lever 49, engages a central portion of Vthe elon
gated pin 53 as shown in FIGURE 1 to limit rocking
movement of the lever 49 in a clockwise direction.
lever e@ are operatively interconnected in a positive man
It 30 ner the lever 49 and the bellcranks Sti will be moved to
the position shown in FIGURE 1 when the gear shift
will be `appreciated that pivotal movement `of the bell
cranks `5@ from the position shown in FIGURE 4 to
the position shown in FIGURE l is yieldably resisted
by the pawl disengaging spring 38. In other words a
biasing force continually tends -to rotate the bellcranks 35
the fact that the pawl roller 35 is unable to mesh with
the teeth 35. It will be obvious that such relative move
Sii in a counterclockwise direction as viewed in FIG
ment between ’the cylindrical member and the bellcrank
lever is actuated by the vehicle operator to the position
corresponding to the gear-engaged position regardless of
URE 1 `about the longitudinal axis yof pivot pin ‘52. Con
5t) is permitted and such relative movement causes the
sequently a counter force must be applied to the lever
e9 to ‘overcome such resilient force lin order to lock the
bank of springs ’7l to exert a resilient force upon the
stated hereinbefore, adjustable «by relatively rotating the
. `Counterclockwise movement of the lever ¿i9 from the
locking pawl 3l and upon the lever tending to yieldably
lever clockwise from the position shown in FIGURE 4 40 urge the curved edge 59 thereof into abutting engagement
with the elongated pin 53. Hence a slight movement of
toward the position shown in FIGURE l. However, as
the vehicle in a forward or rearward direction after the
soon as `the longitudinal axis of the pivot pin 52 crosses
lever 49 has been actuated to its position corresponding
a plane containing the longitudinal »axes of the pivot pin
fto the pawl-engaging position will cause the ring-like
4S and the elongated pin 53, lthe resilient force applied
to `the belloranks `50 by the pawl disengaging spring 3S 45 member 13 to rotate and the roller 34 to roll on the tooth
surface being impinged thereby and the resilient force of
tends to rock the lever 49 in `a clockwise direction. Ob
the bank of springs ’71 acting upon the locking pawl 31
viously since such clockwise rocking `of ythe lever 49 is
will then immediately move the pawl rollers 34 radially
limited by engagement tof the curved edge 59 of the
inwardly into positive locking engagement with the ring
lever with the elongated pin `53 such resilient force tends
to urge the curved edge 59 firmly into abutting engage 50 like member 13 and will simultaneously compress the
pawl disengaging spring 33 as soon as the pawl roller 34
ment With the elongated pin r53. Because of the over
comes into registration with the teeth 35 of the ring-like
center action of the pivot pin 52 when the lever 49 moves
member 13. By virtue of the lost motion resilient con
from the position shown in FIGURE 4 corresponding to
nection between the cylinder member 62 and the bell
the pawl `disengaged position to the position shown in
FIGURE 1 corresponding to the pawl gear-engaging 55 cranks 5t) the vehicle »operator is` prevented from forcibly
jamming the lock pawl roller 34 into mesh with the teeth
position possibility `of the pawl roller 34 being disengaged
3S on the ring-like member ll3 until the pawl roller is in
when the propeller shaft is under `a load is mitigated.
registration with the teeth on the ring-like member I3.
The eiiective length of the cylindrical members 62 is, as
plug ’73 and when properly adjusted the pawl roller 34 is 60 position shown* in FIGURE l by actuation of the shift
control lever within the operator’s compartment causes
in engagement with the cylindrical portion »12 of the drum
the bellcranks Sil to pivot about the pivot pin 55 and
‘I1 when the enlarged head 66 of 'the bolt 63 engages lthe
permit the pawl disengaging spring 38 to expand and
.plate 60 and when the curved edge Á59 ‘of -the lever 49
aiîect movement of the pawl roller 34 to` a radial posi
is in `abutting engagement with the elongated pin S3.
When this relationship of the parts exists the yieldable 65 tion wherein it is disposed outwardly of `a circle contain
ing the radially outermost surfaces of the teeth 35 to un
lock or release the propeller shaft. oftentimes the vehi
cle may be parked on a hill and heretofore with prior
the abutting relationship and is `of sufñcient magnitude
art devices the constant torque on the propeller shaft
to prevent accidental displacement of the lever and thus
permit disengagement of the pawl roller 34 with ‘the 70 would cause binding of the engaging parts of the locking
pawl and gear teeth with the result that difficulty was
teeth 35 but which is not as strong so as to require a
experienced in disengagement of the pawl from the gear
great deal lof eiïort on the part of the vehicle operator to
to unlock the propeller shaft. The pawl roller 34 is in
rock the lever 49 to its unlocked or pawl disengaged
effect an antifriction device interposed between the lock
position.
It will be appreciated that sliding movement of the 75 ing pawl 31 and lthe ring-like member 13 which has a
force developed by lthe compressed pawl disengaging
spring 33 acts upon the lever 49 to yieldably maintain
3,093,212
rolling action with respect to the locking pawl 31 and the
teeth 35 of the ring-like member 13 and thus the lock
ing pawl spring 38 may readily disengage the roller 34
from meshing engagement with the teeth 35 of the ring
and lowered positions, a cylindrical member having one
end surface in abutting engagement with said pawl, means
operatively connecting the opposite end of said cylindrical
more, by inclining the side surfaces 17 of the teeth 35
member to said bellcrank whereby said cylindrical mem
ber is pivotally movable in unison with said bellcrank
and is capable of sliding relatively along its longitudinal
axis with respect thereto, said longitudinal axis of said
the torque applied to the propeller shaft tends to move
cylindrical member being substantially perpendicular to the
like member once the lever 49 is swung to move the plug
73 radially away from the ring-like member 13. Further
rotational axis of said circular member when said bell
of the ring-like member 13. Thus, there will be no tend 10 crank is in said lowered position, said -means operatively
or cam the roller 34 out of engagement with the lteeth 35
ency for the pawl roller 34 to jam in the engaged posi
connecting said cylindrical member and bellcrank includ
tion once the lever 49' is moved to its unlocked position
ing means for limiting sliding movement of said cylindrical
member with respect to said bellcrank, and biasing means
for yieldably urging said cylindrical member in one direc
tion.
regardless of the magnitude of torque applied to the pro
peller shaft. One of the inclined surfaces 17 of the en
gaged tooth 35 (depending on the direction of rotation of
the propeller shaft) acts as a cam surface to induce a dis
engaging force on the roller 34 which force acts in con
junction With the spring force of the spring 3S to insure
complete disengagement of the roller 34 Whenever the
4. In a motor vehicle substantially as set forth in claim
3, including adjustable means for selectively varying the
effective length of said cylindrical member.
5. In a motor vehicle having a circular member rotat
lever 49 is in an unlocked position.
20 able when the vehicle is in motion, said member having
`a plurality of circumferentially spaced teeth formed on
The embodiment of the invention chosen for the pur
its outer periphery; a releasable lock device for positively
poses of illustration and description herein, is that pre
ferred for achieving the objects of the invention and de
preventing rotation of said member including a pawl
veloping the utility thereof in a most desirable manner.
pivotally mounted on a relatively fixed support having a
Due regard being had to existing factors of economy,
simplicity of design, and construction and the improve
ments sought to be effective. It will be appreciated, there
fore, that the particular structural and functional aspects
roller journalled on one end thereof, said pawl being
adapted to pivot about an axis spaced from and substan
tially parallel to the rotational axis of said member be
tween a normal unlocked position wherein said roller is
disposed radially outwardly from a circle extending
emphasized herein are not intended to exclude, but rather
to suggest such other adaptations and modifications of the 30 through the radially outermost surfaces of said teeth in a
locked, tooth engaging position, the rotational axis of
invention -as fall within »the spirit and scope of the inven
said roller being spaced from and substantially parallel to
tion as defined in the appended claims.
the pivotal axis of said pawl, means for moving said pawl
What is claimed is:
from said unlocked position to said locked position includ
l. In a motor vehicle having a circular member rotat
able when the vehicle is in motion, said member having 35 ing a substantially L-shaped bellcrank having an end of
one leg thereof pivotally connected to said relatively fixed
a plurality of circumferentially spaced teeth formed on
support for movement between raised and lowered posi
its outer periphery; a releasable lock device for positively
tions, a cylindrical member having one end surface in
preventing rotation of said member including a pawl
abutting engagement with said pawl, means operatively
having one end pivotally connected to a relatively fixed
support adapted to pivot between a normal unlocked 40 connecting the end of said cylindrical member opposite
the end surface abutting said pawl to said bellcrank where
position and a locked, tooth-engaging position, means
by said cylindrical member is pivotally movable in uni
for moving said pawl from said unlocked position to said
son with said bellcrank and is capable of sliding with
locked position including a substantially L-shaped bell
respect thereto along an axis between two fixed limits,
crank having an end of one leg thereof pivotally con
said sliding axis Ibeing substantially perpendicular to the
nected to said relatively fixed support for movement be
rotational axis of said circular member when said bell
tween raised and lowered positions, a cylindrical member
crank is in said lowered position.
carried by said bellcrank having one end continually in
abutting engagement with said pawl, said cylindrical
6. In a motor vehicle substantially as set forth in claim
member being pivotally movable in unison with said bell
5, including adjustable means for selectively varying the
crank and capable of relative sliding movement with re 50 axial spacing of said end surface of said cylindrical mem
ber engaging said pawl from said bellcrank when said
cylindrical member is at one limit of sliding movement
tudinal axis of said cylindrical member being substan
relative to said bellcrank.
tially perpendicular to the rotational axis of said circular
7. In a motor vehicle having a circular member rota
member when said bellcrank i-s in said lowered position;
and biasing means yieldably resisting sliding movement 55 table when the vehicle is in motion, said member having
a plurality of circumferentially spaced teeth formed on its
of said cylindrical member along its longitudinal axis in
outer periphery; a releasable lock device for positively
one direction.
spect thereto only along its longitudinal axis, said longi
preventing rotation of said member including a pawl pivot
2. In a motor vehicle substantially as set forth in claim
ally mounted on a relatively fixed support adapted to
1, including adjustable means for selectively varying the
effective length of said cylindrical member.
60 pivot between a normal unlocked position and a locked,
tooth-engaging position, means for moving said pawl
3. In a motor vehicle -li'aving a circular member ro
from said unlocked position to said locked position includ
tatable when the vehicle is in motion, said member having
ing a substantially L-shaped bellcrank having an end of
a plurality of circumferentially spaced teeth formed on
one leg thereof pivotally connected to said relatively fixed
its outer periphery; a releasable lock device for positively
preventing rotation of said member including a pawl 65 support for movement between raised and lowered posi
tions, a cylindrical member having one end surface in
pivotally mounted on a relatively fixed support having a
abutting engagement with said pawl, means operatively
roller journalled on one end thereof, said pawl being
connecting said cylindrical member to said bellcrank
adapted to pivot between a normal unlocked position
whereby said cylindrical member is pivotally movable in
wherein said roller is radially spaced outwardly of a circle
containing the radially outermost surfaces of said teeth 70 unison with said bellcrank, and manually operable link
age means supported on said relatively fixed support
and a locked, tooth-engaging position, means for moving
operatively connected to said bellcrank for moving said
said pawl from said unlocked position to said locked
bellcrank between said raised and lowered positions, said
position including a substantially L-shaped bellcrank
linkage means including a lever pivotally connected to
having an end of one leg thereof pivotally connected to
said relatively fixed support for movement between raised 75 said relatively fixed support having a portion thereof
3,093,212
movable with respect to said bellcrank and another por
tion of sai-d linkage means carried by said bellcrank
during pivotal movement of said bellcrank, said lever
portion and said portion of said linkage means carried by
said bellcrank Ibeing engagea‘ble with each other to limit
opposite end of said link means yand a portion of said
lever intermediate the ends thereof, an edge portion of
said lever adjacent said pivot connection means being en
gageable with a portion of said linkage means carried by
said bellcrank during pivotal movement of said bellcrank
pivotal movement of said bellcrank in one direction and
to thereby establish said lowered position of said bell
crank.
8. In a motor vehicle substantially set «forth in claim 7
to limit pivotal movement of said lever in one direction to
a plurality of circumferentially spaced teeth formed on
its outer periphery; a releasable lock device for positively
preventing rotation of said member including a pa-wl
pivotally mounted on a relatively fixed support adapted to
pivot between a normal locked position and a locked, 20
said bellcrank.
13. ln a motor vehicle having'a circular member rotat
able when the vehicle is in motion, said member having
a plurality of circumferentially spaced teeth formed on
its outer periphery; a releasable lock device for positively
thereby establish said lowered position of said bellcrank;
and yieldable means for resiliently maintaining said edge
portion of said lever into engagement with said linkage
including yieldable means for resiliently maintaining said 10 portion carried by said bellcrank.
lever portion and said portion `of said linkage means
l2. In a motor vehicle substantially as set 4forth in
carried by said bellcrank in engagement with each other
claim l1, including adjustable means for selectively vary
when said lbellcrank is in said lowered position.
ing the magnitude of the resilient force exerted by said
9. In a motor vehicle having a circular member rotat
yieldable means maintaining said edge portion of said
able when the vehicle is in motion, said member having 15 lever into engagement with said linkage portion carried by
tooth-engaging position, biasing means yieldably urging
preventing rotation of said member including a pawl pivot
said pawl towards its unlocked position, means for mov
ally mounted on a relatively fixed support adapted to
pivot between a normal unlocked position and a locked,
ing said pawl from said unlocked position to said locked
position including a substantially L-shaped bellcrank
tooth-engaging position, biasing means yieldably urging
having »an end of one leg thereof pivotally connected to
-said relatively fixed support 4for movement between raised
said pawl toward its unlocked position, means for moving
said pawl from said unlocked position to said locked posi
and lowered positions, a cylindrical member having one
tion including a substantially L-shaped bellcrank having an
end surface in abutting engagement with said pawl, means
end of one leg thereof pivotally connected to said rela
operatively connecting the end of said cylindrical mem-ber
tively fixed support for movement between raised and
opposite the end surface thereof abutting said pawl to 30 lowered positions, a cylindrical member having one end
said bellcrank whereby said cylindrical member is pivotal
surface in abutting engagement with a portion of said pawl
ly movable in -unison with said bellcrank, manually oper
radially spaced from the pivotal axis thereof, means oper
able linkage means supported on said relatively fixed
ably connecting the opposite end of said cylindrical mem
support operatively connected to said bellcrank for mov
ber to the other leg of said bellcrank `whereby said end
ing said bellcrank between said raised and lowered posi 35 surface of said cylindrical member is spaced from said
tions, said linkage means including a lever pivotally con
other leg of said bellcrank and said cylindrical member is
nected to said relatively fixed »support having a portion
pivotally movable in unison with said bellcrank, manually
thereof movable with respect to said bellcrank and an
operable linkage means operably connected to said bell
other portion of said linkage means carried by said bell
crank for moving said bellcrank between said raised and
crank during pivotal movement of said bellcrank, said 40 lowered positions, said linkage means. including a lever
lever portion and said portion of said linkage means car
having one end pivotally conected to said relatively fixed
ried by said bellcrank being engagea-ble with each other
support, link means having one end pivotally connected to
to limit pivotal movement of said bellcrank in one direc
an intermediate portion of said lever, and pivot connection
tion and to thereby establish said lowered position of said
means carried by said bellcrank pivotally connecting the
bellcrank, and yieldable means including said biasing 45 opposite end of said link means to said bellcrank at the
juncture of the legs thereof, an edge portion of said lever
means 'for resiliently maintaining said lever portion and
said portion of said linkage means carried by said bell
crank in enga-gement with each other when said bellcrank
is in said lowered position.
being engageable with said pivot connection means to
limit pivotal movement of said lever in one direction to
thereby establish said lowered position of said bellcrank;
`10. In -a motor vehicle substantially as set forth in 50 and yieldable means including said biasing means for
claim 9, including adjustable means for selectively varying
the length of said cylindrical member.
ll. IIn a motor Vehicle having a circular member rota
table when the vehicle is in motion, said member having a
plurality of circumferentially spaced teeth formed on its
outer periphery; a releasable lock device for positively
preventing rotation of said member including a pawl
pivotally mounted on a relatively fixed support adapted to
pivot ‘between a normal unlocked position and a locked
resiliently maintaining said edge portion of said lever into
engagement with said pivot connection means.
14. In a motor vehicle substantially as` set forth in
claim 13, including manually adjustable means for selec
tively varying the spacing between said other leg of said
bellcrank and said end surface of said cylindrical member
in abutting engagement with said portion of said pawl.
l5. In a motor vehicle having a circular member rota
table when the vehicle is in motion, said member having
tooth-engaging position, means for moving said pawl from 60 a plurality of circumferentially spaced teeth formed on its
said unlocked position to said locked position including a
substantially L-shaped bellcrank having an end of one leg
thereof pivotally connected to said relatively fixed support
for movement between raised and lowered positions, a
cylindrical member having one end in abutting engage
ment with said pawl, means operatively connecting said
cylindrical member to the other leg of said bellcrank
whereby said cylindrical member is pivotally movable in
unison with said bellcrank; and manually operable linkage
outer periphery; a releasable lock device for positively pre
venting rotation of said member including a pawl pivotal
ly mounted on a relatively fixed support adapted to pivot
between a normal unlocked position and a locked, tooth
engaging position, biasing means yieldably urging said
pawl toward its unlocked postion, means for moving said
pawl from said unlocked position to said locked position
including a substantially L-shaped bellcrank having an
end of one leg thereof pivotally connected to said relatively
means operatively connected to said lbellcrank for moving 70 fixed support for movement between raised and lowered
positions corresponding to the unlocked and locked posi
said bellcrank between said raised and lowered positions
tions, respectively, of the pawl, a cylindrical member
including a lever having one end pivotally connected to
having one end in abutting engagement with said pawl,
said relatively fixed support, link means having one end
means operatively connecting said cylindrical member to
pivotally connected to said bellcrank at the juncture ofthe
legs thereof, and pivot connection means connecting the
said bellcrank whereby said cylindrical member is pivotal
3,093,212
11
ly movable in unison with said bellcrank, manually oper
able linkage means operatively connected to said bellcrank
for moving said bellcrank between said raised and lowered
positions, said linkage means icluding a lever having one
end pivotally connected to said relatively lixed support for
pivotal movement about an axis spaced and parallel to the
pivotal axis of said bellcrank, link means, first pivot con
nection means carried by said bellcrank pivotally con
necting one end of said link means to the juncture of the
legs of said bellcrank, second pivot connection means
pivotally connecting the opposite end of said link means
to a portion of said lever intermediate the ends thereof,
said second pivotal connection means passing through a
plane containing the pivotal axis of said lever and the
longitudinal axis of said first pivot connection means
as said bellcrank moves between its raised and lowered
positions, an edge portion of said lever adjacent said
second pivotal connection means engaging said first pivotal
connection means to limit pivotal movement of said lever
in one direction to thereby establish said lowered position
of said bellcrank; and yieldable means for resiliently main
taining said edge portion of said lever in engagement
with said ñrst pivotal connection means including said
bias means.
16. In a motor vehicle having a ring-like member rota
12
circle containing the radially outermost surfaces of said
teeth and a locked, tooth-engaging position, spring means
for yieldably urging said pawl toward its unlocked posi
tion, means for moving said pawl from said unlocked
position to said locked position including a substantially
L-shaped bellcrank having an end of one leg pivotally
connected to said relatively fixed support for pivotal
movement between raised and lowered positions about an
axis radially spaced from the axis of rotation of said ring
like member and lying in a plane perpendicular to the
rotational axis of said ring-like member, said raised and
lowered positions of said bellcrank corresponding to the
unlocked and locked positions, respectively, of said pawl,
a substantially flat plate rigidly connected to said bell
crank, a cylindrical member having one end surface in
abutting engagement with said pawl at a point radially
spaced `from the pivotal axis of said pawl, means operatively
connecting said cylindrical member to said plate whereby
said cylindrical member is pivotally movable in unison
with said bellcrank and slidable relatively toward and
away from said plate along an axis perpendicular to said
plate, stop means carried by said cylindrical member and
engageable with said plate for limiting sliding movement
of said cylindrical member away from said plate, resilient
means yieldably urging said stop means into engagement
-with said plate, and adjustable means for varying the
table when the vehicle is in motion, said member having
spacing along the sliding axis of said cylindrical member
a plurality of circumferentially spaced teeth formed on
between the end surface of said cylindrical member engag
its outer periphery; a releasable lock device for positively
ing said pawl and said plate when said stop means is in
preventing rotation of said ring-like member including a
pawl pivotally mounted on a relatively tixed support 30 engagement with said plate.
18. In a motor vehicle substantially as set forth in
adapted to pivot between a normal unlocked position and
claim 17, including manually operable linkage means
a locked tooth-engaging position, spring means for yield
operatively connected to said bellcrank for moving said
ably urging said pawl toward its unlocked position, means
bellcrank between said raised and lowered positions, said
for moving said pawl from said unlocked position to said
linkage means including a lever having one end pivotally
locked position including a substantially L-shaped bell
connected to said relatively tixed support for pivotal
crank having an end of one leg pivotally connected to
movement about an axis spaced and parallel to the pivotal
said relatively iixed support for pivotal movement be
axis of said bellcrank, link means, first pivot connection
tween raised and lowered positions corresponding to the
means carried by said bellcrank pivotally connecting one
unlocked and locked positions, respectively, of said pawl,
a substantially flat plate rigidly connected to said bell 40 end of said link means to the juncture of the legs of said
bellcrank, second pivot connection means pivotally con
crank, a cylindrical member having one end surface in
necting the opposite end of said link means to a portion
abutting engagement with said pawl, means operatively
of said lever intermediate the ends thereof, said second
connecting said cylindrical member to said plate whereby
pivotal connection means passing through a plane con
said cylindrical member is pivotally movable in unison
with said bellcrank and slidable relatively toward and 45 taining the pivotal axis of said lever and the longitudinal
axis of said ñrst pivot connection means as said bellcrank
away from said plate along an axis perpendicular to said
moves between its raised and lowered positions, an edge
plate, stop means carried by said cylindrical member and
portion of said lever adjacent said second pivotal con
engageable with said plate for limiting sliding movement
nection means engaging said iirst pivotal connection means
of said cylindrical member away from said plate, resilient
means yieldably urging said stop means into engagement 50 to vlimit'pivotal movement of said lever in one direction to
thereby establish said lowered position of said bellcrank;
with said plate, and adjustable means for varying the
and yieldable means for resiliently maintaining said edge
spacing along the sliding axis of said cylindrical member
portion of said lever in engagement with said first pivotal
between the end surface of said cylindrical member en
connection means including said spring means.
gaging said pawl and said plate when said stop means is
55
in engagement with said plate.
References Cited in the file of this patent
17. In a motor vehicle having a ring-like member
rotatable when the vehicle is in motion, said member
UNITED STATES PATENTS
having a plurality of circumferentially spaced teeth formed
on its outer periphery; a releasable lock device for posi
1,154,041
tively preventing rotation of said ring-like member includ 60
1,365,841
2,709,504
2,966,244
2,974,752
Mellenthin __________ _..
Mamo _______________ _,
Schreyer ____________ __
Howard _____________ __
2,995,958
Jungeling et al _________ __ Aug. 15, 1961
ing a pawl pivotally mounted on a relatively fixed support
having a roller journalled on one end thereof, said pawl
being adapted to pivot between a normal unlocked posi
tion wherein said roller is radially spaced outwardly of a
Morgan _____________ -__ Sept.
Jan.
May
Dec.
15, 1915
1921
1955
1960
18,
31,
27,
Mar. 14,
1961
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