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Патент USA US2412971

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Patented Dec. 24, 1946
' 2,412,971
2,412,971
TRAIL JACK
Trevor 0. Davidson, Milwaukee, Wis., assignor to
Bucyrus-Erie Company, South Milwaukee, Wis.,
a corporation of Delaware
Application December 9, 1943, Serial No. 513,564
14 Claims. (Cl. 280-43.“)
1
2
My invention relates to new and useful‘im
which event the axle could be rigid with the draw
bar it, if desired. All that is important in this‘
provements in trail jacks for gun mounts.
In modern mobile warfare, it is essential that
?eld artillery pieces be moved into and out of ?r
ing position with the maximum of speed. In
such movings, the critical period, during which
not a minute should be wasted, is the period dur
' ing unhitching from and hitching to the hauling
device.
.
Accordingly it is the principal object of my
invention to devise a hitch whichycan be oper
connection is that the cable-way be capable of ro
tating with respect to the drawbar I 6. Other
ground support could be substituted for wheels l5.
Pivoted on a substantially vertical pivot in
tegral with cable-way i8 is a lever~arm l9. Other
numbered parts of my invention will be men
tioned as the description of its operation pro
gresses.
My invention is operated as follows:
The rail l3 terminates in two brackets 20.
When the trail is in the position shown in Figure
In addition to my principal objects, above stat
1, and it is desired to move the gun, the limber
ed, I have worked out a number of novel and 15 is backed over the trail into the position shown
in Figure 1. The brackets 20 are then pivotally»
useful details, which will be readily evident as
the description progresses.
'
secured to lever-arm l9, by means of a pin or
bolt 2|, passed through holes in the lever-arm
My invention consists in the novel parts and
in‘ the combination and arrangement thereof,
and the bracket.‘
which are de?ned in the appended claims, and of 20 A rope 22, pivotally attached (preferably per
manently) to lever-arm I9 at 23, passes around
which one embodiment is exempli?ed in the ac
companying drawing, which are hereinafter par
cable-way l8, and thence to the usual winch (not
ticularly described and explained.
shown) possessed by the tractor (not shown).
Throughout the description the same reference
As soon as the pin or bolt 2! has been set, the
ated with such speed and precision as to reduce
this period to the barest minimum.
number is applied to the same member or to sim
ilar members.
winch is actuated to draw-in rope 22, which ro
tates lever-arm I9 and cable-way it about axle
ill as an axis, thus raising the trail to the po
with the trail of the gun on the ground.
sition shown in Figure 2. It is to be noted that,
when the parts are in this position, the connec
Figure 2 is a side elevation of my invention,
with the trail in position for traveling.
Sill tion it between lever-arm i9 and brackets 20 is
practically in toggle above axle it. This not only
Figure 3 is a plan view of my invention, in the
same position as Figure 2.
causes axle it to support the weight of the trail
by direct compression through lever-arm ill with,
Figure 4 is a. side elevation of my limber in
traveling position without the cannon.
out strain, but also enables the accomplishing of
Referring to the first three ?gures, We see that 35 the snug-take-up function (about to be described)
by hand, inasmuch as there is practically no
It is a conventionalized representation of the
Figure 1 is a side elevation of my invention,
mount of a field gun (not shown). It is shown
as supported on four rubber-tired wheels l2.
To this mount llthei‘e is attached a trail l3,
in any conventional manner so that the rear
end thereof can be raised from and lowered to
the ground. This trail serves to brace the gun
during ?ring, and to serve as a means for drag
ging the gun backwards during moving.
I4 is the axle of a limber, shown as having two
rubber-tired wheels l5, and a drawbar I6, which
weight to be lifted in the course thereof.
Screw 24, which depends from trail l3 has at
its lower end an eye, through which it is now
40 secured to lever-arm l9 by pin or bolt 25. Lever
arm I9 is then taken up snug against trail l3 by
means of screwing hand-nut 26 down against
sliding washer 28. Nut 26 is then locked by
hand-nut 27.
The cannon can then be towed away.
Lowering the trail into place is accomplished
is attached to a wheeled tractor (not shown) or
in inverse order.
other highly mobile tractive instrumentality.
When the cannon has been towed to its ?ring
Of course, it could equally well form a part of
position and detached from the limber, screw 25
such instrumentality.
50 and. associated parts, which loose from the trail,
The wheels [5 .are journaled on the ends of the
axle M, which axle is in turn journaled' (as at
l1, H) to the drawhar l5. An offset curved ca
except when screwed up tight as already de
scribed, are lifted up out of place. Then, for the
dual purpose of keeping this screw and associ
ble-way vl8 is built rigid with the axle id, but‘ 55 ated parts from getting lost, and of ?rmly an
choring the parts or the limber together for
might equally well be free to rotate thereon. in
2,412,971
3
traveling without the cannon, the eye of screw
24 is now preferably pinned to lever-arm at 22
(the rope 22 preferably,~but not necessarily, being
unhitched) , or may be left in its original attach
ment. Sliding washer 28 on screw 2i ?ts into
notch 29 on segment IS. The (formerly) upper
end of the screw rests in yoke 30, which is inte
4
of the nuts being capable of bearing against the
trail and being locked by the other nut,‘ and
being further characterized by the fact that the
towinggvehicle has a rigid yoke whereby, when
the eye of the screw is attached to the element
in raised position, the screw may be secured to
the yoke by the two nuts.
'
4. A trail jack, comprising an element adapted
to be pivotally supported on a ground-engaging
nuts 26 and 21 toward each other, one on each 10 towing vehicle-on a horizontal transverse pivot,
a portion of said element in lowered position being
side of the yoke.
adapted to register with a portion of the trail,
Having now described and illustrated one form
when the latter is on the ground; means for
of my invention, I wish it to be understood that
pivotally securing these two portions together;
my invention is not to be limited to the speci?c
form orarrangement of parts herein described 15 an offset curved cable-way constrained to rotate
with the element; and means for then rotating
and shown.
‘
the element, to raise the trail off the ground,
Iclaim:
_
said means including a rope attached to the
1. A trail jack, comprising an element adapted
to be pivotally supported on a ground-engaging ‘ element, and passing vover the cable-way, and
towing vehicle on a horizontal transverse pivot, 20 thence to an actuating means; and characterized
by the fact that the cable-way is notched, and
a, portion of said element in lowered position be
by the fact that the element has means for se
ing adapted to register with a portion of the
curing it to the trail when in raised position,
trail, when the latter is on the ground; means
said securing means comprising a readily remov
for pivotally securing these two portions together;
an, offset curved cable-way constrained to rotate 25' able screw-eye depending from the trail and hav
ing a washer thereon, and two nuts to raise and
with the element; and means for then rotating
lock the screw; said element’alsorhaving means
"the element, to raise the trail off the ground, said
for attachment to the eye when said element is
means including a rope attached to the element,
'- gral with cross-beam 3| 0! the limber, and the
screw is clamped to this yoke by screwing hand
in raised position, and the towing vehicle having
and passing over the cable-way, and thence to
an actuating means; and characterized by the 30 a rigid yoke, whereby the washer can be inserted
in the notch in the cable-way, and the screw
fact that the element has means for securing it
can then be locked to the yoke thereby securing ‘
to the trail when in raised position; said securing
means comprising the following two parts, namely,
an attaching means supported by the trail, and
means [or thereby rotating the element into ?rm
relation to the trail.
2. A trail jack, comprising an element adapted
to be pivotally supported on a ground-engaging
towing vehicle on a horizontal transverse pivot,
a portion of said element in lowered position being
adapted to register with a portion of the trail,
when the latter is on the ground; means for
pivotally securing these two portions together;
the element against rotation, while the towing
vehicle travels without the trail.
,
5. A trail jack, comprising an element adapted
to be pivotally supported on a ground-engaging
towing vehicle on a horizontal transverse pivot,
a portion of said element in lowered position being
adapted to register with a portion of the trail,
when the latter is on the ground; means for piv
otally securing these two portions together; an
offset curved cable-way constrained to rotate with
the element; and means for then rotating the
element, to raise the trail off the ground, said
an offset curved cable-way constrained to rotate
with the element; and means for then rotating 45 means including a rope attached .to the element,
and passing over the cable-way, and thence to
the element, to raise the trail off the ground, said
an actuating means; and characterized by the fact
means including a rope attached to the element,
that the element has means for securing it to the
and passing over the cable-way, and thence to an
trail when in raised position, said securing means
actuating means; and characterized by the fact
that the element has means for securing it to 60 comprising a screw-eye depending from the trail,
and means for raising and locking the screw
the trail when in raised position; said securing
means comprising an attaching means depending
' from the trail, and means for raising the attach
eye.
6. In a trail jack, the combination of: an ele
towing vehicle is disengaged from the-trail, the
lowered position being adapted to register with
ment adapted to be pivotally supported by a
ing means; said attaching means being a readily
removable screw, having at its lower end an eye 55 ground-engaging towing vehicle on a horizontal
transverse pivot, a portion of said element in
for attachment to the element, whereby when the
eye may be attached to a portion of the element
and the screw clamped to a rigid portion of the
towing vehicle.
,
3. A trail jack, comprising an element adapted
to be pivotally supported on a ground-engaging
a portion of the trail when the latter is on the
ground; means for pivotally securing these two
portions together; and means for then rotating
60 the element, to raise the trail off the groundinto
carrying position; further characterized by the
fact that in lowered position the means for piv
otally securing the element to the trail is sub
a portion of said element in lowered position being
adapted to register with a portion of the trail, 65 stantially below the pivotal axis of the element,
and that in carrying position this means is sub
when the latter is on the ground; means for piv
stantially in toggle above said pivotal axis.
otally securing these two ‘portions together; an
‘7. A trail jack, according to claim 6, further
offset curved cable-way constrained to rotate with
characterized by the fact that the element in
the element; and means for then rotating the
element, to raise the trail off the ground, said 70 cludes an off-set curved cable-way, and that the
, towing vehicle‘ on a horizontal transverse pivot,
means including a rope attached to the element,
means for rotating the element includes a rope
pivoted thereto, and passing over the cable-way,
and passing over the cable-way, and thence to
and thence to an actuating means.
an actuating means; and characterized by in
8. A trail jack, according to'claim 6, further
cluding a screw eye and two nuts, the eye being
capable of attachment to [the element and one 75 characterized by the fact that the element has
~
‘m
nosi
.
for
1::
:
tion: sci
’
‘
y
meens.
for sec on
tion; said securing means comprising on at
me; said
7 ins means for attachment to the eye when said
is disengaged from the treil, the eye may be et- ’
inched to e. portion of the element and the screw
element and one of the nuts being cnnebie oi‘
be
against the ti'eil end; being locked by the
other nut, and being further charecterized by
the fact that the towing vehicle has a. rigid yoke
whei'eby, when the eye of the screw is attached
to the element in raised position, the screw may
be secured to the yoke by the two nuts.
.11. A treil jack, according to claim 6, further
characterized by the fact that the element in
cludes an o?'set curved cable-way, and thntthe
means for rotating the element includes a. rope
pivoted thereto, and m -. over the cable-way,
and thence to en actuating we; and by the
comprising a, readily
‘removable screw-eye depending from the trail
f'and. having e washer thereon, and two nuts to
raise and lock the screw; said element also hav
attaching means beine s readily removable screw,
having at its lower end on eye for obtechment
to the element, whereby when the to
vehicle
clned to e mgid portion of the towing vehicle.
10. A tneii jack, coco:
to claim 6, funther
characterized by including it screw eye and two
mate, the eye being capable of ottechment to the
it to the trail when in raised nosi
‘tion, acid securing me
meens depending from the trail, and
the ettec 1i
element is in raised position, and the towing ve
hicle having a. rigid yoke, whereby ‘the washer
can be inserted in the notch in the cable-Way, and
the screw can then be locked .to the yoke, thereby
securing the element can
rotation while the
towing vehicle travels Without the trail. ,
'13. A trail jack,
to claim 8, further
characterized by the fact that the element has
meens-ior seeming it to the trail when in raised
position, esid securing means comprising a, screw
eye depending from the tmil, and means for
raising
ioc . w
the screw-eye.
is. n treii jack, according to claim 6,- further‘
characterized by the fact that the element ‘in
clud? on o?set cu
cable-way and that the
means for ‘rotating the element includes a, rope.
reto, and
‘-:-_~ over the cable-way,
30 pivoted
and thence to en actun ‘;-. means; and by the
‘fact that the element has cans for securing it.
to the trail when in raised position, said securing
m 3,1‘ 3. comps a, screw-eye depending from
feet that the element has means for securing
it to the trail when in raised position,
(1
35 the trail, end means for n:
“1.: corn}: .~ z-iv an
1.;
rted b th treiLend
1.1; ' mils
over the
cable-way, and thence to an actuating means:
m; by the feet that the element has means
by the fact that the element‘ hos
for
the means for rotating the element includes?
a rope pivoted thereto, and we '-
i . i i'or securing it to-the trail when in rnised
'
to claim‘G, iurthei’
udes n‘ notched 08sec curved ‘cable-way, end
it -.
v
9. A trail 3, according to claim 6. further
.
ecco
i . d by the fact that the element'in
lo 4 two!"
‘1
Ported by the trail
.
' and locking the '
.w
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