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Патент USA US2408562

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Oct. 1, .1946.
2,408,561
w. |_. KEEHN
DUAL AXLE TRAILER
Filed Dec. 2e, 1944
5 sheetsèsneet 1
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, Oct. 1, 1946.
w.-L. KEEHN
2,408,561
lDUAL AXLE TRAILER
Filed Dec. 28, 1944
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3 Sheets-Sheet 2
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Oct. 1, 1946.
2,408,561
v_v. L. KEEHN
DUAL AXLE TRAILER
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Filed Deo. 28, 1944 -
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PatentedL Oct. 1, 1946
2,408,561
UNITED STATES '.¿ÉAT'ENT OFFICE
2,408,56i
Y
DUAL Axrn TRAILER
Warner-
t
vKeehn, Spokane, „ Wash.
Application necember 2s, 1944, serial No. 570,203
5' Claims. (Cl. 28o-102)
1
.
This invention relates to a trailer and more
particularly to a trailer 'having dual axles, it be
ing one object of the invention to provide a trail
er with axles so mounted that when a turn is
Y
2
~
which may be referred to as walking beams, and
a cross beamfor bunk 3> extending transversely‘of
y the trailer over intermediate portions of the side
beams. Back of the bunk the side beams have
portions Ia and 2a which extend diagonally in
crossed> relation to each other so that the rear
portion of each side beam is at the opposite side
of the trailer from the forward portion thereof.
The diagonally extending portion of beam I is
10 formed" with a yoke 4 through which the diago
made the two axles may both turn and thus pre- ~
vent wear upon the tires of wheels carried by one
axle being `greatly in> excess of wearr upon the
tires of wheels carried by the other axle. 'I'here
fore, the wear upon the vtires of all the Wheels
will Ibe approximately even instead of one set of
tires wearing faster than thej other.
Another object of theV invention is to so mount
the axles that as one’is turnedabout its fifth
nally extending portion of beam 2 passes. End
portions o-f the side beams are formed with down
wardly curved arms 5 terminating in transverse
wheel, corresponding turning movement will be
ly spaced tongues 6 through which a bolt 'I is
transmitted. to the other axle and the two axles 15 passed for resting upon the upper leaf 8 of a
thus caused to simultaneously turn for steering
~ spring structure 9. In spaced relation to each
the trailer and preventing the tires of wheels
end, each side beam is formed with transversely
upon one axle being subjected to transverse rub
spaced ears I Il" for carrying a bolt I I and each
bing action which has a tendency to quickly wear
spring structure has the innerend of its upper
the treads of the tires.
y
,
20 leaf rolled to form a sleeve or hinge ear I2 through
Another object of the invention is, to provide
which the companion pin or >bolt I I passesto piv
the trailer with walking beams so mounted that
otally mount the spring’structure and permit the
front and rear axles of the trailerwill 'be swung Y
front and rear Wheels, I3 and I4, carried .by the
in opposite directions when a turn is made, the
axles I5- and‘IS, to follow uneven vsurfaces of a
axles being provided with springsv which> permit 25 road-or
move across rocks or other obstructions.
vertical movement> of the same when the wheels
The wheels turn freely'on the axles and each axle
move along rough roads or across rocks or other
carries saddles I'I spaced from its end Vand. dis-_
obstructions.
v
posed under the companion spring structures 9.
Another object of the invention is to provide «the
A» post I8 extends upwardly from each saddle for
trailer with a tongue so connected with aL draft 30 passing through an opening I 9 in the bottom
bar that after logs have been dumped, the trail
plate 2l] of a housing v2| carried by the lower plate
er may be shifted forwardlyuntil its front wheels
2`2 o-f a spring shackle 232 Since the posts I8 are
rest upon a truck with which the trailer is con
nected, the trailer being thus >hauled'when not
rotatable in the housings 2I, pivotal movement
is permitted between the axles and the side beams
35 and when the front axle I5 is turned in onedirec
Another object ofthe invention is to provide a
ti'on, the rear axle may turn in an opposite direc--v
trailer which is very strong and capable of carry
tion, as indicated by dotted lines in Fig. 1, and
ing a heavy load of logs.
v v
loaded with logs.
`
"
.
In the accompanying drawings: *_
the front and rear wheels of the trailer so» dis- 'ì
that' the trailer will follow a turnmade' by
Fig. 1 is atop plan view of the improved trailer. 40 aposed
main truck to which the trailer is hitched. ,
Fig. 2 is a View showing the trailer partially in
The trailer is turned toward one side or the
side elevation and partially in section, the view
other kby swinging the bunk horizontally, as indi
being taken on the line 2-.--2 of Fig. 1.
cated by dotted lines in Fig. 1, and referring to
’ Fig. 3 is a view taken longitudinally through the
Fig. 5, it will beseen that the bunk. carries de
tongue and draft bar on the line 3_3 of'Fig. 1.
pending bearings 24 spaced from each other lon
flfig; 4 is a fragmentary sectional view on the
gitudinally of the bunk and through which'a
line 4-4 of Fig. 1.
v
shaft l25 is mounted. Posts 26 extend downward
Fig. 5 is a View taken transversely through the
ly
from' the shaft 2:5’ and, at their upper ends, are
trailer on the line 5_5 of Fig. 2.
i
Fig. (i is a fragmentary view, on the line‘B-G
of Fig. 1, showing the crossed portions of the lon
gitudinally extending beams of the trailer.
This improved traileris particularly adapted
formed »with tubular cross . heads §21' through
which the shaft passes. The posts 25 pass
through openings 28 formed in the side beams I
and 2 at the junction of the front ends of `their -
diagonally extending portions with rear ends of
their Vforward portions and lower ends of the'
longitudinally extending side> beams Iv and 2, 55 posts 'protrudefrom the side beams and carry col
for use for-hauling logs and has a frame including
2,408,561 _
3
lars 29 having ears 30 at their outer sides to which
are connected rear ends of torque arms or bars
3l having their front ends connected with ears
32 depending from the side beams. The collars
23 are connected by a strip 33 carrying an up
standing strip 34 which is welded to the strip or
plate 33 and has its upper end secured by a bolt
35 to a bracket 35 depending from a plate 31 sup
ported upon upper faces of the side beams and
formed with openings registering with the- open
ings 28 through which the posts 26 pass. Flat
strips 3d extending longitudinally of the trailer
with the forward portions welded to forward por
tions of the side beams and their rear end por
tions slidably passing through the rear shackles
4
springs, housings carried by and depending from
said springs, trunnions extending upwardly from
said axles and rotatably received in the housings,
a bunk extending transversely across said beams
adjacent rear ends of their forward portions, a
shaft under said bunk extending longitudinally
thereof and rockably mounted, posts extending
downwardly from said shaft and rotatably mount
ed through openings formed vertically through
ne side beams, collars carried by lower ends of
said posts, a bridge connecting said collars and
having an upper portion extending between and
resting upon said'side beams and formed with
openings registering with the post-receiving
openings of the side beams, ears extending down
wardly from said side beams forwardly of said
23 and serving to prevent the trailer'from weav- . v
, posts, torque bars connecting said collars with
ing when a load of logs rocks from side to side n
said ears, side strips extending longitudinally of
while traveling over rough roads.
the trailer at opposite sides thereof with their
Movement of the bunk 3 for steering the trailer
forward ends ñxed to forward portions of the side
is controlled by a tongue 39 which projects for 20 beams and their rear portions slidable longitudi
wardly from the bunk midway the length thereof
nally of the rear portions of the side beams, and
and is braced by triangular webs 40 welded to its
means extending forwardly from the bunk for
opposite sides and to the front face of the bunk.
connection with a towing vehicle.
This tongue extends forwardly over the front
2. A trailer comprising side beams each having
25
axle and, at its front end, carries a yoke or cradle
forward and rear portions at opposite sides of
4I which is U-shaped in cross section and welded
the trailer and a diagonal intermediate portion
to the tongue with a portion projecting forwardly
connecting its end portions, springs carried by
therefrom. Hinge ears 42 extend downwardly at
ends of said side beams, front and rear axles ex
opposite sides of a slot at the front end of the
tending transversely of the side beams under said
cradle 4l and carry a pin 43 which passes through 30 springs and pivotally connected with the springs
the-depending ear 44 of a sleeve 45 and pivotally
for swinging movement about vertical axes under
mounts the sleeve for vertical tilting from a hori
the springs, a bunk extending transversely across
zontalposition in which it rests in the cradle, as
said beams adjacent rear ends of their forward
shown in full lines in Fig.V 3, to the inclined posi
portions, a shaft under said bunk extending longi
tion indicated by dotted lines in this figure. A 35 tudinally thereof and rockably mounted, posts
bar or strip 46 is welded to the sleeve and extends
extending downwardly from said shaft and ro
longitudinally thereof with its rear portion pro
tatably mounted through openings formed verti
jecting from the sleeve for engagement between
cally through the side beams, and means extend
-tongues 41 rising from the rear end of the cradle.
ing forwardly from said bunk for connection
40
A pin 43 which is passed through the tongue 41.
with a towing vehicle.
vand the rear end of the bar 46, normally holds
3. A trailer comprising side beams each having
the sleeve alined with the tongue so that the draft
forward and rear portions at opposite sides of
bar 4S passing through the sleeve will be alined
the trailer and a diagonal intermediate portion
with the tongue and, at its rear end, the draft
connecting its end portions, springs carried by
bar’carries a collar 50 which limits its forward 45
movement through the sleeve.
AWhen the trailer is loaded and is being towed
behind a logging truck, the tow bar or draft bar
-remains in alinement with the tongue 39 and the
trailer follows the truck. As turns are made, the 50
bunk is swung and the side beams shifted longi
tudinally in opposite directions so that the front
and rear axles will be swung in opposite direc
tions, as indicated by dotted lines in Figure 1 and
`the trailer caused to> follow the truck. After a 55
vload has been dumpedfrorn the truck and trailer,
the pinV 48 is removed and the tow bar may tilt
vertically to allow the trailer t0 be shiftedr for
--wardly upon its rear wheels I4 until its front
wheels >I3 rest upon the truck. The sleeve 45 60
slides-forwardly along the tow bar 49 as the trailer
is shifted forwardly or rearwardly. Since the
rear end of the tongue 39 is rigid with the bunk
3 `and the bunkY is pivotally connected with the
shaft 25 by bearings 24, the tongue and the tow
bar may have vertical pivoting movement rela
tive to the frame of the trailer while a loaded
trailer is being towed back of a logging truck. ‘
What is claimed is:
,ends of said side beams, front and rear axles ex
tending transversely of the side beams under said
springs and connected therewith for pivotal
movement 'about vertical pivots, a bunk extending
transversely of the trailer over the side beams at
junctions of forward portions of the beams with
.their diagonally extending intermediate portions,
means mounting the bunk for tilting about an
axis extending transversely of the trailer and piv
ally connecting the bunk and the side beams for
pivotal movement about vertical axes to shift the
side beams longitudinally and swing the front
and rear axles in opposite directions for steering
the trailer, and means extending forwardly from
the bunk for connection with a towing vehicle.
4. A trailer comprising side beams each having
forward and rear portions at opposite sides of
the trailer and a diagonal intermediate portion
connecting its end portions, front and rear axles
extending transversely of the side beams under
end portions thereof and connected therewith for
pivotal movement about vertical pivots, a bunk
extending transversely of the trailer over the side
beams at junctions of the forward portions of
the beams with their diagonally extending inter
'
1. A trailer comprising side beams each having 70 mediate portions, bearings extending downwardly
forward and rear portions at opposite sides of the
from said bunk, a shaft under said bunk extend
vtrailer and a diagonal intermediate portion con
ing longitudinally thereof through said bearings
necting its end portions, springs carried by ends
and mounting the bunk for rocking movement,
posts extending through openings formed through
-ing transversely of the sideV beams under said 75
of said side beams, front and rear axles extend
2,408,561
5
the side beams at the junction of their forward
portions with their intermediate portions where
by the bunk may be swung horizontally about
Vertical axes and the side beams shifted longi
tudinally for swinging the axles horizontally `in
opposite directions to steer the trailer, and means
carried by `and projecting forwardly from said Y
bunk for connection with a towing vehicle.
,
5. A trailer comprising Side beams each having
a forward portion and a rear portion at opposite
sides of the trailer and an intermediate portion
extending diagonally between the front and rear`
portions, front and rear axles extending trans
versely under front and rear ends of the side
6
beams and connected therewith for swinging
movement horizontally about vertical axes, a
bunk extending transversely across the side
beams adjacent rear ends of their forward por
tions, means for supporting said bunk over the
side beams engaged with the side beams to permit
horizontal swinging of the bunk- longitudinally
of the trailer and longitudinal shifting of the side
beams for swinging the axles in opposite direc
tions to steer the trailer, and means extending
' forwardly from said bunk for connection with a
towing vehicle.
WARNER L. KEEHN.
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