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Jan. 7, 1947.
2,413,761
|_. F. GROOVER
LANDIvNG GEAR TRUCK FOR SEMI-TRAILERS
Filed Dist. 27, 1944
-
Q
2 Sheets-Sheet 1
INVENTOR.
lnuRf/v f.- GROOVER.
"BY
,
‘MA ATTORNEY .
Jan. 7, 1947.
'
1.. F. GROOVER
'
2,413,761
LANDING GEAR TRUCK FOR SEMI-TRAILERS
’
Fil'ed Oct. 27, 1944
'
_
2 Sheets-Sheet 2
i
41k
IN VEN TOR.
LHURE/V E GROOVER.
v
WWW
£61444 TTQRNEY ;
Patented Jan. 7, v1947
2,413,71
UNITED STATES
9F“??
LANDING GEAR TRUCK FOR
~
=
*SEMITRAILEBS»
Lauren F. Groover, Butler, _Pa., assignor of one
“ " half to‘Richard'A;Holm’an,jButler, lfa."*“"
Application October 27, 1944, Serial No. 560,629
3 Claims‘. (01. @5195)
1
My invention relates to ‘landing gear trucks
for semi-trailers, and more particularly to land
[551, ‘the .SQITBWS being apartheid bl.’ sharing-.15 and
ing gear apparatus for the front ends vof the
semi-trailers.
'
a shaft {5a to-which a crank will be attached to
mm the shaft ahdithe seal‘ Wheels- If desired
chhventiohal forms of .?hiéi rprésshre apparatus
could be used for raising and lowering the trucks.
The tubes 13 have studs 15‘ that extend his slats
2,6 in the members ii, to prevent rotation of the
tubes when turning the screws M.
'
One object of my invention is to provide land
ing gear apparatus of the type referred to which
will readily and automatically adjust itself to
uneven around .uponwhich it may rest when the
trailer is detached from ‘the truck-tractor.
Another- object of my invention is to provide
means for automatically realigning the landing
‘A socket or ball cap it is welded or otherwise
secured to the lower-end 9f each tube 91? eolumh
*3 and has seated connection with 8» hartially
gear trucllzs, with respect to the trailer body when
they are raised'or elevated.
Another shied (if mv'invehhoh is to prqvide
means on the landing gear trucks to resist miring
thereof in soft ground.
spherical vportion J1) "of the truck-body '9', ‘thus
if?rmihg worn: a the banana-septa .WPe- The
joint "member '11 is held'in place by a bolt 13,
and a V partially-spherical washer or retainer
block lethal iszkeyéd to the bolt ahdiis .vieldably
A further object of my invention is to provide
9, device of the character referred to, wherein
an aligning spring and‘it's associated parts in ‘the
landing gear truck‘is housed and sealed against
111.015.“? e and dirt-
‘
‘Still another object is to provide a “ball and
socket connection between a landing gear truck
and a landing gear pedestal of the trailer bhdv.
2
engage the threads on the interiors of the ‘nuts
held against the bearing member ‘11. ‘The "parts
are 'so- assembled ‘that there is running clearance
20
for ‘the joint- rnernber l1 and ‘suitable lubricant
will be provided in the joint. The ‘bolt is lSllg
idly secured ‘to the‘ bearihg‘rnember It‘.
Each‘ truth has he hqrhphs .2! on which
Wheels 3? have its? movement A Shoe 23 that
so arranged that it is approximately at or below 2-5 sliFYes 3.1.59 ‘3.5 a $921.35 Seatahd as asealihg or
the axis of the landing‘gear truck wheels.‘
In the accompanying drawings, Figure 1 shows
clpshie plats 1:5 seemed to the'lowei end hi the
truth ahdihe-‘sphh'; 2.4 isiihtarpstd httween r3
and the block‘l?, the ends of the spring being
bent and extending into holes in the plate and
in lowered position; Fig. 2 is a front view on an
the block. The spring is so tensioned that it
enlarged scale of the landing gear in lowered
yieldably retains the axes of the wheels in trans
position; Fig. 3 is a schematic view showing some
verse relation to the longitudinal center line of
of the positions which the wheels of the landing
the trailer. Also, the spring has full seating
gear trucks may automatically assume when sup
engagement with the plate 23 so that if the truck
porting a trailer body; Fig. 4 is a vertical sec 35 is tilted in a vertical plane as in Fig. 2, the
tional view on a further enlarged scale through
spring, when the truck is raised from the ground,
one of the landing gear trucks; Fig. 5 is a view
will restore the trucks to proper horizontal aline
taken on the line V-——V of Fig. 4; and Fig. 6 is a
ment. There is su?icient looseness of ?t of the
bearing member I‘! with the members It and i9
Vertical sectional view through a modi?cation of
the structure of Fig. 4.
40 that the spring will be effective to restore the
Referring ?rst to Figs. 1 to 5, 6 represents a
truck to its normal position when the truck is
truck-tractor of any conventional form connected
raised, and there will be no idle swinging of the
a portion of a truck-tractor with a semi-trailer
connected therewith, and the landing gear trucks
through a suitable form of coupling 1 with a semi
truck.
'
trailer 8. A landing gear comprising truck 9 is
From the foregoing, it will be seen that the
shown in lowered position, for supporting the 45 trucks will, when supporting the front end of the
front end of the trailer when the motor truck 6
trailer, readily adapt themselves to unevenness
of the ground, as indicated in Fig. 3, thus per
is detached therefrom. When the trailer is to
mitting each wheel to support approximately its
be transported, the landing gear truck will be
raised to the dotted line position shown in Fig. 1.
share of the load. Furthermore, if the ground
A pair of tubular legs or pedestals II are rig 50 is soft and the wheels sink, the shoes 23 will
engage the ground and assist in supporting the
idly secured to frame members l2 of the trailer
and are braced by struts l2a. Tubes I3 that
load, and the wheels will not sink so deeply. The
have nuts I3a secured in their upper end have
extent to which the truck can tilt with respect
telescopic engagement with the legs ll. They
to the column I3 is limited by a shoulder 25 that
are raised and lowered therein by screws I4 which 55 Will be engaged by the lower edge or lip of the
2,413,761
4
3
socket member l6 when the truck has tilted ver
tically to a, predetermined distance.
Referring now to Fig. 6, the apparatus func
tions in substantially the same manner as the
landing gear truck of the other ?gures, but in this
case, the ball-and-socket joint is inverted and lo
cated in a lower position on the truck, the ball
mal vertically and horizontally alined position
with respect to the load-carrying member after
they have been de?ected from such position, the
socket portion of the joint being formed in the
truck body mainly at a plane below the axis of
the wheels and being upwardly exposed for the re
ception of the ball element of the joint.
2. A truck comprising a body portion having
portion 26 of the joint being carried bythertu
a pair of wheels in axially-spaced relation, ball
bular column l3 and the socket portion 21 of the
and-socket joint elements in superposed relation
truck being formed in the truck body and having
and carried by said body, between the wheels
a ground-engaging plate or shoe 28 secured there
thereof, a load-carrying member extending up
to. A centering spring 29 which is engaged by the
wardly from the upper element, the other ele
upper enlarged end of the bolt 30 and a seating
ment having axle portions that are directly sup
surface in the ball member 26 serves to return
the parts to their normal position when the truck 15 ported by the wheels, and spring means for re
turning the truck body and its wheels to a nor
is raised. The socket portion 21 of the joint, to
mal vertically and horizontally alined position
gether with the bolt 30, will have universal move
with respect to the load-carrying member after
ment on the ball portion 26 of the joint as per
they have been de?ected from such position, the
mitted by the clearance between the ball member
ball element of the joint being formed on the
26 and the mid portion of the bolt, and as con
truck body in position to serve as a seat for the
trolled by the spring 29.
socket portion of the joint, the spring serving also
In' this arrangement, the ball joint is set low
to maintain the joint elements in assembled re
in the truck frame, the major portion of the ver
lation.
tical load being imposed thereon at about or
3. A truck comprising a body portion having a
somewhat below the axial line of the truck wheels. 25
By this arrangement, there is less overhang of
pair of wheels in axially-spaced relation, two ball
load and consequent strain on the truck frame
and-socket joint elements in relatively superposed
relation and carried by said body, between the
wheels thereof, a load-carrying member extend
brought into engagement with an uneven sup
30 ing upwardly from the upper joint element, the
porting surface.
7
lower joint element having axle portions that are
It will be seen that in both forms of the inven
directly supported by the wheels, one of the ele
tion the spring is protectively housed and that the
ments having a chamber therein, a coil spring in
joint is readily assemblable and disassemblable.
said chamber, having one of its ends in seating
Also, the swiveling of the trucks on vertical axes
casting-particularly‘ " when
the
wheels
are
facilitates lateral shifting or turning of the front 35 engagement with an end wall of the chamber, a
seat on the other joint element, for the other end
end of the trailer when supported by the trucks,
of the spring, and a member for holding the joint
as well as longitudinal movements of the trailer.
elements in bearing engagement with each other
I claim as my invention:
but having clearance with one of the elements in
1. A truck comprising abody portion having a
pair of wheels in axially-spaced relation, ball 40 such directions as will permit relative swinging
movements of the said elements, in vertical and
and-socket joint elements in superposed relation
horizontal planes, the spring ends having inter
and carried by said body,-between the wheels
locking engagement with their respective seats, to
thereof, a load-carrying member extending up.
yieldably maintain the truck against de?ection
wardly from the upper element, the other ele
'
ment having axle portions that are directly sup 45 about a vertical axis.
LAUREN F. GROOVER.
ported by the wheels, and spring means for re
turningthe truck body and its wheels to a nor
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