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Патент USA US3079185

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Feb. 26, 1963
3,079,l 75
D. A. wAL'rl-IER
' FIFTH WHEEL couPLER ASSEMBLY
Filed Dec. 21. 1961
3 Sheets-Sheet 1
/6
/4
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38
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26
53
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55
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25
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52
54
INVENTOR. y
DAN/EL Á. WAL TIL/Ef?
'MV
BY
Í ' tij/@Wim
ATTORNEYS
Feb. 26, 1963
3,079,175
D. A. WALTHER
FIFTH WHEEL COUPLER ASSEMBLY
Filed Deo'. 21. 1961
3 Sheets-Sheet 2
INVEN TOR.
DA/V/EL A. WÁLTHER
F/G. 4
Á TTÚR/VEYS
Feb. 26, 1963
D. A. wAL'rHER
. 3,079,175
FIFTH WHEEL coUPLEE ASSEMBLY
Enea ne@ 21. 1961
s sheets-sheet s
INVENToR.
_
DAN/EL A. WAI. THER
ATTORNEYS
3,@79J75
Patented Feb. 26, 1%63
2
3,079,175
Daniel A. Walther, Dayton, ûhio, assigner to The Dayton
Steel Foundry Company, Dayton, Unio, a corporation
FIFTH WHEEL COUPLER ASSEMBLY
of @his
Filed Dec. 21, 1961, Ser. No. lêldlófl
12 Claims. (Cl. 28h-434)
The present invention relates generally to improvements
in trailer coupler construction. More particularly, the
appended claims and not by the details of the specification.
Referring to the drawings:
FlG. l is a bottom plan view of the improved fifth
wheel according to the present invention;
FlG. 2 is a cross sectional view taken substantially on
2_2 of FIG. l;
FIG. 3 is an enlarged fragmentary area of FIG. 1 show~
ing the locking mechanism engaging a kingpin and locked
in that position;
FIG. ¿i is a view similar to FIG. 3 depicting the locking
invention relates to devices for coupling a tractor to a 10
mechanism unlocked and latched preparatory to disen
trailer, which are commonly referred to in the art as fifth
wheels.
Basically, such a tractor-trailer type coupler assembly
includes a vertically depending Kingpin on the front of the
trailer which seats in an appropriate slot in the fifth wheel
mounting on the rear of the tractor. The kingpin is re~y
tained in the fifth wheel slot by an appropriate locking
mechanism.
gagement of the pin therefrom; and
FIG. 5 is a view similar to FIGS. 3 and 4 depicting the
locking mechanism after disengagement of the pin and
with the latch mechanism having been set for automatic
recoupling.
ln general, a fifth Wheel coupling assembly according
to the present invention utilizes a standard fifth wheel
having a slotted top plate mounted on the rear of a tractor,
Primarily, the coupling assembly must be constructed
sutiiciently sturdily to maintain the connection between 20 the fifth wheel having an improved locking mechanism
to positively engage and lock a kingpin. The locking
the trailer and the tractor even under the most severe
mechanism comprises a one-piece coupler jaw pivoted
operating conditions and yet permit easy manual discon
beneath the top plate at one side of the fifth wheel slot
nection.
and swingable in relation to the slot so as to engage a
To disconnect a iifth wheel coupling assembly, the op
erator generally manipulates a control on the fifth wheel l
while standing or stooping at the side of the trailer. Most
prior art >coupling devices require a great deal of physical
exertion to unlock, especially if the parts of the assembly
are slightly worn or if the tractor and trailer are so posi
tioned that the kingpin is exerting pressure against the
locking mechanism.
Moreover, in order to provide a locking mechanism
which is automatically set to receive a kingpin upon re
lease of the previously held pin, the prior art mechanisms
lringpin therein within an arcuate recess on one edge of
the coupler jaw. When the coupler jaw is rotated to en
gage a hingpin iu coupled position, the coupler jaw is
engaged by a locking -bar horizontally pivoted beneath the
top plate of the fifth wheel on the opposite side of the
slot from the coupler jaw pivot point, The locking bar
has an arcuate engaging surface with the center of the
arcuate engaging surface being substantially coincident
with the pivot point of the locking bar. The mating sur
face on the coupler jaw is similarly arcuate.
The improved cooperative latch means comprises dual
have been extremely complex and therefore not only more
lock latches operative in an escapement-like manner to
expensive ‘out also more subject to wear.
preset the locking mechanism for automatic recoupling.
It is therefore an obiect of the present invention to pro
In the drawings the fifth wheel coupler assembly, repre
vide an improved locking mechanism which will positively
engage and lock the kingpin in coupled position and whic . 40 sented generally by the numeral lo, incorporates a stand
ard fifth wheel having a top plate il of conventional shape
can be manually unlocked under any conditions by a min
with a peripheral depending flange l2 and strengthening
imum of physical effort on the part of the operator.
webs 13. rEhe top plate is secured to the rear platform
lt is a further obiect of the present invention to provide
of »a tractor (not shown) by a pair of depending bosses
an improved cooperative locking mechanism and latch
le pivotally connected to supporting brackets l5. ln the
means therefor which will reset for automatic recoupling
area between brackets f5 and strengthening webs 13 the
by uncoupling the previously coupled lringpin.
underside of the top plate il has a dependent underhous
It is a still further object of the present invention to
ing le which protects and provides support for the several
provide an improved locking mechanism which will not
automatically recouple unless the kingpin is properly er1
gaged.
it is a still further object of the present invention to
provide a iifth wheel coupling assembly having the above
mechanism and an improved means for absorbing the
shocks between the kingpin and the fifth wheel, which
are particularly severe during the recoupling operation,
operating elements described below.
The rear portion of the top plate has rearwardly diver
gent leg portions 13, reinforced by a bottom web plate
i9, the inner edges Zd of which define the guide opening
2i adapted to guide a kingpin into engagement with the
coupler jaw, indicated generally by the numeral 23.
The coupler jaw 23 is pivotally mounted within under
housing 16 so as to rotate horizontally across the reapl
and which means also eliminates shock, or play, between
the liingpin and the locking mechanism.
't is a still further object of the present invention to
ward end of a kingpin slot 2d communicating with the
potential for mechanical failure and wear.
These and other objects of the invention, and further
arcuate recess 28 on one edge. The recess 28 is adapted
guide opening 2l. The coupler jaw pivots on a pin 25
extending between top plate ll and underhousing i6 and
provide a fifth wheel coupling assembly incorporating the
above improvements and yet comprising a minimum num 60 is biased to rotate rearwardly and assume the pre-couple
receiving position shown in FIG. 5 by a coil coupler
ber or” parts all of which are simplified and uncomplex,
spring 26.
thereby reducing the manufacturing costs as well as the
The coupler jaw has a cam surface 27 and an adjacent
advantages thereof, will become apparent in the following 65 to engage a kingpin 29, as is best shown in FlG. 3. The
specification and are accomplished by means hereinafter
described and claimed.
One preferred embodiment is shown by way of exam
coupler jaw 23 also includes a forwardly directed eX
tension 30 at the extreme end of which is a depending
pin or linger 3l, the purpose of which is more fully here
ple in the accompanying drawings and hereinafter de
inafter described.
Rearwardly of recess 2S the coupler jaw 23 forms a
scribed in detail without attempting to show all of the
various forms and modifications in which the invention
might be embodied; the invention being measured by the
gate arm 32 on the rear side of which is an arcuate lock
ing surface 33 which cooperatingly engages a similar
3,079,175
4
3
arcuatesurface 34 on the jaw portion 35 of the locking
bar 36. Bar 36 is freely pivoted on a pin 33 which is
positioned on the opposite side of slot 24, from and
preferably forward of, pin 25. Pin 38 also extends be
tween the top plate '1l and the underhousing 16.
A throw arm portion 39 of the locking bar 36 extends
generally forwardly .from the pivot point 38 in an op
The operation Vof the improved ñíth wheel assembly
is best understood by reference to the sequential opera
tion of the locking mechanism depicted in FIGS. 3
through 5.
To release the coupling mechanism the locking bar is
posite direction from the jaw portion 35.
ate surface 34 thereon from the mating surface 33 on
rotated by pulling handle 44, shown in FIG. 1. In mov
ing the locking bar 36 sufficiently to disengage the arcu
coupler jaw 23, the latch pin 58 on bar 36 is moved to a
By making the engaging surface 34 on bar 36 arcuate
about the pivot point of bar 36-i.e., on an arc about 10 position where it can be engaged by the latch notch 5S
on upper lock latch bar 52. Biasing pressure of helical
.the center «of pin 3ä~-the locking bar 36 will positively
spring 55 snaps latch notch 58 into engagement with
engage `and retain the coupler jaw 23 in the coupled
pin 56. This restrains bar >36 against the biasing pres
position `depicted in FIG. 3 and yet will release the cou
sure of compression spring 40 around release rod 41,
pler jaw with the minimum expenditure of etîort. Were
the center ofthe arc placed between pin 3S and slot 24 15 and the kingpin 29v is free to be moved rearwardly out of
the slot 24,
the locking bar 36 would Atend to unlock merely by the
When the kingpin 29 is locked in the FIG. 3 or cou
pressure of «the coupler jaw 23 thereagainst. Were the
pled position at the forwardmost end of slot 24 the outer
center of the arc placed on the other side of pin 38
end '-60 of lower lock latch bar 53 is engaged thereby
away from slot 24, ,the llocking bar 36 would bind by
20 and the lower lock latch bar 53 is thereby prevented
the least pressure from coupler jaw 23.
from engagingrlatch?pin S6. After .thecoupling mecha
To reduce pressure concentration and assure the maxi
nism has been unlocked, as in FIG. 4, and the 4Kingpin
mum operating etiiciency of the locking mechanism, the
29 is moved rearwardly out of Aslot 24, as shown in FIG.
>engaging surface -33 on coupler jaw 23 is preferably of
5, the lower locklatch bar 52-is rotated, by-helical spring
arcuately mating configuration.
55, so that `the «la-tch notch 59 thereon also engages pin
56. As the kingpin 29 clears the coupler jaw 23 the de
pending ñnger 3'1 on the forward extension 30 of jaw
VTo prevent inadvertent release of the locking bar 36
from the coupler jaw 23 and to actuate the locking bar
during automatic recoupling, a helical compression spring
40 biases the locking bar toward the locked position. The
:23 engages the outer end 61 of upper lock latch bar 52,
disengaging latch notch 5S from pin 56. It will be noted
spring 40 is positioned on the outside of release rod 41
which is pivotally attached to lthe forwardmost end of 30 that notch 59 on lower lock latch S3 is ‘longer .than the
notch 58 on the upper lock latch 52 so that if notch 58
throw arm 39 by pin 42 and extends outwardly to the
is disengaged from pin 56 .the locking jaw on bar 3_6
side of the tifth wheel passing through strengthening
rotates slightly toward slot 24 by the pressure of com
ilange 43 and peripheral flange 12 terminating in a suita
pression spring 41. This escapement-like movement of
blehandle 44. The compression of spring 40 between
strengthening flange 43 4and throw arm 39 effectively 35 the latching mechanism prevents re-engagement of the
`v~biases _the locking bar 36 into locking enga-gement with
upper lock latch 52 with pin 56 during the recoupling
coupler jaw123.
oper-ation. It should `further be noted that the upper
lock latch 52 is sufiiciently shorter vthan the lower lock
To absorb the shock or impact of coupling and to elimi
nate slack the fifth wheel assembly incorporates a corn
latch ‘53 so as not to extend into -the slot 24 and engage the
40
which is also pivoted on pin 38. Thefrearward surface
kingpin 29.
The vuncoupling of the kingpin 29 thus automatical
of compression jaw 45 presents an arcuate recess 46 to
engage a kingpin at the rear of slot 24, and the forward
most portion is adapted to engage a resilient compres
sion bushing 48 received in a recess 49 in underhousing 45
depicted in FIG. 5, and the coupler jaw 23 is maintained
in lthe pre-couple receiving position .by the action of
spiral spring 26.
pression jaw, indicated generally by the numeral 45,
16. As shown,xthe tlat surface 5B deñning `the .bushing
engaging portion on compression kjaw 45 is provided
with a peripheral skirt 51 which circumscribes bushing
‘48. The compression jaw `45 is preferably limited to
.rotate through an arc of approximately 5°.
ly resets the locking mechanism for recoupling, as is
To recouple, the tractor is manipulated so as to cause
the kingpin 29 to be moved forwardly into slot 24 where
it engages cam Á27 Áand recess 28. The coupler jaw 23
rotates with the pin 29 as it is received in arcuate recess
This can 50 28 until the pin enga-ges the compression jaw 45 which
be controlled by having the dimension of skirt 51 such
.that it contacts strengthening web 13 after the jaw 45
`yields by .the action of bushing 48 to absorb the shock
of lthe coupling maneuver. As the kingpin 29 reaches
has rotated through the desired arc or by having a stop
this coupled position it engages the outer end 60 of
-lug 47 depending from the jaw 45 which will appropriate
lower lock latch 53, thus rotating latch '53 suñiciently to
55
-ly contact the forward end of the kingpin slot 24. Bush
dis-engage notch 59 from pin 56. Because notch 59 is
ing 48 is preferably of neoprene or some other resilient
longer than notch 58 in lock latch 52, lthere is no op
material which is unaffected by oils or grease.
portunity for the pin 56 to be re‘engaged by notch 58
The improved latching mechanism comprises an upper
and the locking bar is forced to pivot and engage cou
and lower lock latch bar 52 and 53, respectively, pivotally
pler jaw 23 by «the action of compression lock spring 41,
mounted on a common stud 54 which .also extends be 60 and recoupling'is thus automatically etîected.
The
upper
.tween top plate I11 `and underhousing 16.
During the recoupling operation, which entails backing
latch bar 52 extends .toward slot 24 above locking bar
the tractor into engaging relation with the trailer, it
36 'and lower lock latch bar 53 is similarly directed,
sometimes occurs that the front of the trailer jumps or
lbelow bar 36. A helical latch spring `55 is positioned
isso positioned that the kingpin bounces or is received
65
around stud 54 and interconnects latch _bars '52 and 53
in the kingpin slot in such _afashion that the bottom of
so as to cause Ithem to rotate in opposite directions to
the kingpin rests on top of the coupler jaw 23. Other
ward a latch pin 56 positioned‘therebetween and which
known recoupling mechanisms would be actuated even by
extends above and below locking bar ‘36 in which it is
this imperfect mating of parts and indicate that proper
coupling had taken place. However, in a coupling asse-m
secured.
bly constructed according to the lpresent invention even
The opposed edges of latch bars 52 and 53 are each
though the coupler jaw 23 could be rotated to coupled
>provided with a latch notch 5S and 59, respectively,
position by this improper positioning of the kingpin, the
vwhich engage latchpin 56 in escapement-like fashion to
lower- latch bar 53 could not be operated and such im
automatically reset the locking mechanism `for recou
,pling
75 proper coupling could not be jetîective.
5
@79,175
What is claimed is:
for biasing said locking -bar to engage said coupler jaw,
l. A ñfth wheel having a top plate with a rear open
means for disengaging said locking bar from said cou
ing formed by divergent leg portions, said opening termi
pler jaw, upper and lower lock latch bars pivoted beneath
nating in a longitudinally elongated medial slot for re
said top plate on the same side of said slot as, and out
ceiving a vehicle kingpin, a locking and latching mecha 5 wardly of, said lock bar, said upper latch bar swingable
nism comprising, a coupler jaw pivoted on one side of
transversely above said lock bar, said lower latch bar
saidV medial `slot beneath said top plate and swingable
swingable transversely beneath said lock bar, a latch pin
across the rear of said slot and adapted to engage a ve
extending through said lock bar, said latch bars biased to
hicle kingpin in coupled position, a -locking surface on
ward said latch pin, the sides of said latch bars toward
the rear of said coupler jaw, a generally llongitudinally 10 said latch pin having a latch notch for engaging said pin
disposed locking bar, said locking bar pivoted beneath
when said lock bar is disengaged from said coupler jaw,
said top plate on the opposite side of said medial slot
resilient means for biasing said latch bars toward said
from »said coupler jaw, an arcuate locking surface on said
latch pin, means on said coupler jaw for disengaging said
locking bar for engaging the locking surface of said
upper latch bar from sa-id lock bar when said coupler
coupler jaw, the arc of said arcuate locking surface cen
jaw is rotated from coupled to receiving position, and
tered substantially at the pivot point of said locking bar,
means on said lower latch bar to disengage it from said
means for biasing said locking bar to engage said cou
lock bar by entry of a kingpin in coupled position
pler jaw, means for disengaging said locking bar from said
4. A fifth wheel having a top plate with a rear open
coupler jaw, lock latch bars, said latch bars movably
ing formed by divergent leg portions, said opening termi
mounted on the same side of said medial slot as said lock 20 nating in a longitudinally elongated medial slot for receiv
bar, means on said latch bars selectively to retain said
lock Ibar disengaged from said coupler jaw, means on
said coupler jaw to disengage one said `latch bar from said
lock bar when said coupler jaw is rotated from coupled to
ing a vehicle kingpin, and a- locking and latching mecha
nism comprising, a coupler jaw pivoted on one side of said
medial slot beneath said top plate and swingable across
the rear of said slot and adapted to engage a vehicle king
pin in coupled position, a locking surface on the rear of
receiving position, and means on said other latch bar to
disengage it from said lock bar by entry of a kingpin in
said coupler jaw, a generally longitudinally disposed lock
ing bar, said locking bar pivoted beneath said top plate on
coupled position.
2. A fifth wheel having a top plate with a rear opening
formed by divergent leg portions, said opening terminat
ing'inv a longitudinally elongated medial slot for receiving
lthe opposite side of said medial slot from said coupler
jaw, an arcuate locking surface on said locking bar for
30
a vehicle kingpin, a locking and latching mechanism
comprising, a coupler jaw pivoted on one side of said
engaging the locking surface of said coupler jaw, the
arc of said arcuate locking surface centered substantially
at the pivot p-oint of said locking bar, means for biasing
said locking bar to engage said coupler jaw, means for
medial slot beneath said top plate and swingable across
the rear `of said slot and adapted to engage a vehicle
disengaging said locking bar from said coupler jaw,
upper and lower latch bars pivoted beneath said top plate
kingpin` in coupled position, a locking surface on the rear
_of said coupler jaw, a generally longitudinally disposed
locking bar, Asaid locking bar pivoted beneath said top
on the same side of said slot as, and outwardly of, said
lock bar, said upper latch bar swingable transversely
above said lock bar, said lower latch bar swingable trans
versely beneath sa-id lock bar, a latch pin extending
plate _o'n the vopposite side of said medial slot from said
coupler jaw, an arcuate locking surface on said locking
_bar for engaging the locking surface of said coupler jaw,
40 through said lock bar with a latch bar passing on each
the arc of Said arcuate locking surface centered substa-n
side thereof, said latch bars biased toward said latch
pin, the sides of said latch bars toward Isaid latch pin
having a latch notch for engaging said pin when said lock
bar is disengaged from said coupler jaw, resilient means
for biasing said latch bars toward said latch pin, means
on said coupler jaw for disengaging said upper latch bar
from said lock ba-r when said coupler jaw is rotated from
coupled to receiving position, and means on said lower
latch bar to disengage it from said lock bar by entry
50 of a kingpin in coupled position.
ti'ally at the pivot point of said locking bar, means for
biasing said locking bar to engage said coupler jaw,
means for disengaging said locking bar from said cou
pier jaw, lock latch bars pivoted beneath said top plate
on the same side of said slot as, and outwardly of, said
lock bar, said latch bars swingable transversely of said
lock bar, engaging means on `said lock -bar for en
gaging said latch bars when said lock bar is disengaged
-from said coupler jaw, one said latch `bar passing hori
zontally on each side of said engaging means, the side
.0f said latch- bar toward said engaging means having a
latch notch- for engaging said engaging means when said
lock bar is. disengaged from said coupler jaw, resilient
means for biasing said latch bars-towards said engaging
5. A fifth wheel having a top plate with a rear open
ing formed by divergent leg portions, said opening ter
minating in a longitudinally elongated medial slot for
receiving a vehicle Kingpin, and a locking and latching
mechanism comprising, a coupler jaw pivoted on one side
of said medial slot beneath said top plate and swingable
means, means on said coupler jaw to disengage one said
latch bar from said lock bar when saidcoupler jaw is ro
across the rear of said slot and adapted to engage a Ve
tated from coupled to receiving position, and means on
hicle kingpin in coupled position, a locking surface on the
rear of said coupler jaw, a generally longitudinally dis
said other latch bar to disenga-ge it from said lock bar
by‘entry of a kingpin in coupled position.
60
1 3.' A fifth wheel having a top plate with a rear opening
formed by divergent leg portions, said opening terminat
ing in a longitudinally elongated medial
ing> avehicle kingpin, and a locking and
anism comprising, a coupler jaw pivoted
said medial slot beneath said top plate
posed locking bar, said locking bar pivoted beneath said
top plate on the opposite side of Said medial slot from said
coupler jaw, an arcuate ‘locking surface on said locking
slot for receiv
bar for engaging the locking surface of said coupler jaw,
latching mech
the arc of said arcuate locking surface centered substan
on one side of 65 tially at the pivot point of said locking bar, means for
and swingable
biasing said locking bar to engage said coupler jaw, means
across the rear of said slot and adapted to engage a ve
for disengaging said locking bar from said coupler jaw,
hicle kingpin in coupled position, a locking surface on the
rear of said coupler jaw, a generally longtiudinally dis
upper and lower lock latch bars pivoted beneath said top
plate on the same side of said slot as, and outwardly of,
said 'lock bar, said upper latch bar swingable transversely
above said lock bar, said lower latch bar extending into
said slot and swingable transversely beneath said latch bar,
a latch pin extending through said lock bar with a latch
bar passing on each side thereof, means for biasing said
posed locking bar, said locking bar pivoted beneath said
top plate on the opposite side of said medial slot from
said coupler jaw, an arcuate locking surface on said
locking bar for engaging the locking surface of said cou
pler jaw the are of said arcuate locking surface centered
substantially at the pivot point of said locking bar, means
latch lbars toward said latch pin, a latch notch on said
vsione-_174s
Ts
upper latch bar for engaging said latch pin on said lock
upper latch bar for engaging said latch pin on ksaid lock
.bar and maintaining said lock bar disengaged from said
coupler jaw, a similar notch on said lower latch bar, the
.bar and maintaining said lock bar disengaged from said
coupler jaw, a similar notch on said lower latchrbar, the
_latch notch on said lower latch bar extending closer to
.latch notch on said lower latch bar extending closer to
said medial slot than the notch on said upper latch bar,
»means on said coupler jaw to disengage said upper latch
said medial slot than the notch on said upper latch bar,
a forwardly extending arm on said couper. jaw, a linger
latch bar extending into said medial slot .where it is con
depending from said forwardly extending arm, said linger
adapted to-contact said upper latch bar when said coupler
.jaw is rotated from‘coupled to receiving position to dis`
tacted by entry of a Kingpin in coupled position to dis
engage said ‘lower latch bar from said lock bar.
engage said upper latch bar Yfrom said lock bar, `the end
of said lower latch bar extending into said medial slot
vbar from said lock bar when said coupler jaw is rotated
from coupled to receiving position, the end of said lower
being contacted -by entry of a kingpin in coupledposition
`to disengage said lower latch bar from said lock bar, a privotal compression jaw `at the forward end of .saidmedial
6. A iifth wheel having a top plate with a rear open
ing formed 'by divergent-leg portions, said openingtermi
nating in Aa longitudinally elongated medial slot for re
ceiving a vehicle kingpin, and alocking and latching mech
slot, resilient means for absorbing thevforwarfd thrust of
anism comprising, a coupler jaw pivoted on one side of
said compression jaw.
¿formed by divergent leg portions, said opening terminating
across lthe rear vof usaid slot and adapted to engage a
.vehicle kingpin in coupled position, a locking _surface on
the rear of said coupler jaw, «a generally longitudinally
/
S. A lfifth whe'elhaving atopplate with a rear opening
said medial slot beneath said-top plate and _swingable
20
disposed locking bar,4 said Vlocking bar pivoted beneath said
top plate on theeopposite side of _said medial slot ¿from
said coupler jaw, `anarcuate `locking surface ¿on vsaid lock
ing bar for engaging thejlocking surface of said coupler
jaw, the arc of said :arcuate locking` surface centered sub- Y
vstantially at the pivot point of said locking bar, means
for biasing said locking ybar to engage said lcoupler‘jaw,
means for disengaging said locking bar from said coupler
jaw, upper and lower lock latch Vbars pivoted beneath
said top plate on the same side of said slot as, ¿and out
wardly of, said lock bar, said upper latch-bar‘swingable
'transversely above said lock bar, said lower latch »bar
extending into said slot and swingable transversely jhe
neath said latch bar, a latch pin extending through ¿said
lock bar with a latch bar passing on eaçhuside thereof,
means for biasing said latch bars towardsaid latch pin,
¿a latch notch on said upper latch bar for engagingsaid
Alatch pin on said lock bar and maintaining `said Vlock ybar
disengaged from said coupler jaw, a similar notch on?said
lower 'latch bar, the latch notch on said lower latch bar , 40
extending closer to said medial slot than the notch ori-,said
upper latch bar, a forwardly extending arm on said cou
pler jaw, a iiinger depending from said >forwardly `ex
in a longitudinally ¿elongated medial slot‘forreceiving- a
vehicle kingpin, and a ¿locking and latching mechanism
comprising, a coupler jaw `pivoted on one side _of said
_medial 4slot beneath îsaid top plate and swingable _across
`the rear of ,-said >slot .and adapted «to engage `a Avehicle
kingpin in coupled -position, a locking ¿surface won-the
rear of said coupler jaw, a generally longitudinally _dis
posed locking bar, Vsaid lockingbar-.pivot-ed beneathfsaid
Vtop plate on the opposite side of said medialslotfromsaid
coupler jaw, Van arcuate locking surface on said locking
bartortengagingthe locking surface of saidcoupler jaw,
the arc of said arcuate'loclting surface centered substan
tially at the pivot point of said »locking bar, means for
biasing said lockingbar to engage said coupler jaw, means
,for disengaging said locking bar from said coupler «,jaw,
upperoand lower latch bars ¿pivoted on a common 4shaft
,beneath said top plate lon thev same side'o'f said slotas,A and
outwardly of, said lock bar„said ,upper latch bar swing
able transversely above vsaid lock bar, said lower latch-bar
swingable transversely beneath saidlockbar, a latch pin
extendingtlirough said lock lbar with a latchbar passing.
on each side thereof, common spring means biasing said
latch `bars _toward said latch pin, the sides rof saidl jlat’ch
bars toward said latch `pinhavinga latch notchfonen
gaging said pin when said lock bar is disengaged >‘from
tending arm, said linger adapted to contact said upper
‘.latch bar when said coupler jaw is rotated from coupled v
to receiving position to disengage said upper latch bar
from said lock bar, the end oisaid lower latch‘bar‘ex
said coupler jaw, resilient means Vfor biasing said ‘latch
bars toward _said latch pin, means on said coupler yjaw
for disengaging said upper latch bar vfrom said lock bar
when said coupler jaw isrotated -from coupled toreceiving
tending into said medial slot where it is contacted by
-entry or" a kingpin in coupled position to disengage said
vit from said lock Ibarby entry of a kingpin in coupled
lower latch bar from said lock bar.
7. A tiíth wheel having a top plate with a rear opening
position,_and means on said lowerglatch bar to disengage
position.
"
,
,
`
_,
,
9. A fifth wheel’having a top plate with a rear opening
-formed by divergent leg portions, said opening terminat
`-forrned by divergent leg portions, said opening terminat
ing in a longitudinally elongated medial slot forreceiving
.a vehicle kingpin, and a locking and latching mechanism
comprising, ’a cornpressionjaw pivotally mountedbeneath
comprising, a coupler jaw pivoted on one side of said
>medial slot beneath said top plate and swigable across the
yrear of said slot and adapted to engage a vehicle kingpin
in coupled position, a locking surface on the rear of said
coupler jaw, a generally longitudinally disposed locking
bar, said locking bar pivoted beneath said top plate on
»the opposite side of said medial slot from said coupler
jaw, an arcuate locking surface on said locking bar for
engaging the locking surface of said coupler jaw, the arc
vof said arcuate locking surface centered substantially at
the pivot point of said locking bar, means for biasing
,said locking bar to engage said coupler jaw, means for
disengaging said locking bar from said coupler jaw, upper
and lower lock latch bars pivoted beneath said top plate
on _the same side of said slot as, and outwardly of, said
lock bar, said upper latch bar swingable transversely
,above said lock bar, said lower latch bar extending into
said slot and swingable transversely beneath said latch
ing in a longitudinally elongated medial slot for receiving
a vehicle kingpin, yand a locking »and latching mechanism
said top plate and extending across `the forward end vof
said slot, resilient means ~`for absorbing the forwardthrust
of said compression jaw, a coupler jaw pivoted on -one
'Side of said medial slot beneathsaid top plate andl swing
able across the rear of said Yslot and adapted to engage -a
vehicle kingpin in coupled position, a locking -surfa'ce
on the rear of said coupler jaw, a generally longitudinally
disposed locking bar, said locking bar Ypivoted beneath
said top plate on the opposite -side of said medial slot
>frontsaid coupler jaw, an arcuate locking-’surface on said
locking'bar for engaging the locking surface -of `said cou
pler jaw, the are of said arcuate locking surface centered
substantially at the pivot point of said locking bar, means
for biasing said‘locking bar to engage said Vcoupler jaw,
means for disengaging said locking bar from said cou
pler jaw, upper and lowerlatch bars pivoted beneath said
top plate on _the same side of said slot as, and outwardly
of, said lock bar, said upper >latch ’bar swingable'trans
versely above said lock bar„said lower latch bar swingable
bar, a latch pin extending through said lock bar with >a
latch bar passing on eachside thereof, means for biasing
transversely beneath said lock bar, a latch pin extending
said latch bars toward said latch pin, a latch notch on said 75
amavis
through said lock bar with a latch bar passing on each
side thereof, said latch bars biased toward said latch pin,
the sides ot said latch bars toward said latch pin having
a lat-:l1 notch for engaging said pin when said iocli bar is
disengaged from said coupler jaw, resilient means for
biasing said latch bars toward said latch pin, means on
said coupler jaw for disengaging said upper latch bar from
said lock bar when said coupler jaw is rotated from cou
pled to receiving position, and means on said lower latch
bar to disengage it from said lock bar by entry of a king~
pin in coupled position.
10. A ñÍth wheel having a top plate with a rear open
ing formed by divergent leg portions, said opening termi
nating in a longitudinally elongated medial slot for re
ceiving a vehicle kingpin, and a locking and latching mech
anism comprising, a compression jaw pivotally mounted
beneath said top plate and extending across the forward
end of said slot, resilient means for absorbing the for
ward thrust of said compression jaw, a coupler jaw pivoted
on one side of said medial slet beneath said top plate
disposed locking bar, said locking bar pivoted beneath
said top plate on the opposite side of said medial slot from
said coupler jaw, a locking surface on said locking bar
for engaging the locking surface of said coupler jaw,
means for biasing said locking bar to engage said coupler
jaw, means for disengaging said locking bar from said
coupler jaw, lock latch bars, said latch bars movably
mounted on the same side of said medial slot as said lock
bar, means on said latch bars seiectively to retain said
lock bar disengaged from said coupler jaw, means on said
coupler jaw to disengage one said latch bar from said
lock bar when said coupler jaw is rotated from coupled to
receiving position, and means on said other latch bar to
disengage it from said lock bar by entry of a kingpin in
coupled position.
12. A ñfth Wheel having a top plate with a rear opening
formed by divergent leg portions, said opening terminat~
ing in a longitudinally elongated medial slot for receiving
a vehicle kingpin, and a locking and latching mechanism
comprising, a coupler jaw pivoted on one side of said
and swingable across the rear of said slot and adapted to 20
engage a vehicle kingpin in coupled position, a locking
surface on the rear of said coupler jaw, a generally longi
tudinally disposed locking bar, said locking bar pivoted
beneath said top plate on the opposite side of said medial
slot from said coupler jaw, an arcuate locking surface on
said locking bar for engaging the locking surface of said
coupler jaw, the arc of said arcuate locking surface cen
tered substantially at the pivot point of said locking bar,
means for biasing said locking bar to engage said coupler
jaw, means for disengaging said locking bar from said ‘
coupler jaw, upper and lower latch bars pivoted on a
common shaft beneath said top plate on the same side of
said slot as, and outwardly of, said lock bar, said upper
latch bar swingable transversely above said lock bar, said
lower latch bar swingable transversely beneath said lock
medial slot beneath said top plate and swingable across
the rear of said slot and adapted to engage a vehicle
ykingpin in coupled position, a locking surface on the rear of
said coupler jaw, va generally longitudinally disposed lock
ing bar, said locking bar pivoted beneath said top plate on
the opposite side of said medial slot from said coupler jaw,
a locking surface on said locking bar for engaging the lock
ing surface of said coupler jaw, means for biasing said
locking bar to engage said coupler jaw, means for disen
gaging said locking bar from said coupler jaw, upper and
lower lock latch bars pivoted beneath said top plate on
the same side of said slot as, and outwardly of, said lock
bar, said upper latch bar swingable transversely above
said lock bar, said lower latch bar swingable transversely
beneath said lock bar, a latch pin extending through said
lock bar, said latch bars bised toward said latch pin, the
bar, a latch pin extending through said lock bar with a
sides of said latch bars toward said latch pin having a
latch bar passing on each side thereof, common spring
latch notch for engaging said pin when said lock bar is
means biasing said latch bars toward said latch pin, the
disengaged from said coupler jaw, resilient means for bias
sides of said latch bars toward said latch pin having a
ing
said latch bars toward said latch pin, means on said
40
latch notch for engaging said pin when said lock bar is
coupler
jaw for disengaging said upper latch bar from said
disengaged from said coupler jaw, resilient means for
lock bar when said coupler jaw is rotated from coupled to
biasing said latch bars toward said latch pin, means on
-receiving position, and means on said lower latch bar to
said coupler jaw for disengaging said upper latch bar
disengage it from said lock bar by entry of a kingpin in
from said lock bar when said coupler jaw is rotated from
coupled position.
coupled to receiving position, and means on said lower 45
latch bar to disengage it from said lock bar by entry of
References Cited in the ñle of this patent
a kingpin in coupled position.
UNITED STATES PATENTS
l1. A lifth wheel having a top plate with a rear open
ing formed by divergent leg portions, said opening ter
minating in a longitudinally elongated medial slot for
receiving a vehicle kingpin, a locking and latching mecha
nisrn comprising, a coupler jaw pivoted on one side of
said medial slot beneath said top plate and swingable
1,991,507
2,885,222
Ketel ________________ __ Feb. 19, 1935
Walther ______________ __ May 5, 1959
70,942
France ______________ __ Mar. 16, 1959
1,022,694
France ______________ __ Dec. 12, 1952
FORElGN PATENTS
(First addition to Patent 1,144,733)
across the rear of said slot and adapted to engage a ve
hicle kingpin in coupled position, a locking surface on
the rear of said coupler jaw, a generally longitudinally
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