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Патент USA US3072448

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Jan. 8, 1963
B. s. LIVINGSTON El'Al.
3,072,433
TILTING DUMP TRUCK END GATE LATCH uscwmzrsu
Filed Jan. a1, 1958
2 sheets-sheet 1
INVFNTORJ
BurZeySLmi/rysfo?,
By Wan/ire Err?”
ATTORNEY-S
:
Jan. 8, 1963
a. s. LIVINGSTON EI'AI.
,
3,072,433
TILTING DUMP TRUCK END GATE LATCH MECHANISM
Filed Jan. 31,» 1958
2 Sheets-Sheet 2
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United States Patent 0 "cc
1
3,072,438
TIL'I‘ING DUMP TRUCK END GATE LATCH
MECHANISM
3,072,438
Patented Jan. 8, 1963
2
body 18 to the frame 14 for movement from the horizontal
position shown in FIGURE 1 to a position in which the
dump body 18 slopes upwardly with the forward end 20
spaced above the frame 14, as shown in FIGURE 2.
A vertically disposed gate 30 extends over and closes the
rearward end of the dump body 18 and is connected at its
upper end by means of binge pins 32 to the adjacent por
tion of the rearward end 22 of the dump body 18 for
swinging movement from the vertical closed position to a
The present invention relates to dump trucks generally
and in particular to a latch mechanism for the end gate of 10 vertical open position when the dump body 18 has been
moved to the upwardly sloping position responsive to the
a dump truck.
force of gravity thereto.
An object of the present invention is to provide an end
The present invention, of a releasable latch mechanism
gate latch mechanism for a dump truck which is automatic
10, comprises a shaft 34 arranged transversely of and
in operation, one which securely locks the end gate of the
dump truck in the closed position when the dump truck 15 beneath the bottom the the dump body 18 adjacent the
forward end 20 of the body 18.
is in the transport condition, and one which automaticallly
The shaft 34 has its end portions journaled in the side
releases the end gate when the dump body of the dump
members 36 and 38 of the truck frame 14, as shown in
truck is raised to discharge the contents thereof.
FIGURE 3, and has its midportion extending through and
Another object of the present invention is to provide
an end gate latch mechanism for a dump truck which is 20 journaled in the legs of an inverted U-shaped bracket 40
having the bight dependingly secured to the underside of
not damaged by the closing of the end gate upon an ob
the dump body 18.
struction of small size which normally would put a strain
The shaft 34 is rotatable in clockwise and counterclock
on a latch mechanism for such end gate, one which is
wise directions for a limited part of one revolution, there
sturdy in construction, one simple in structure readily
installed upon any and all styles of dump trucks, and one 25 being provided a stop 42 on one portion of a sleeve mem
ber 44. The sleeve member 44 is ?xedly secured to the
which is economically feasible.
shaft 34 immediately adjacent one of the legs of the
These and other objects and advantages of the present
bracket 40. The stop 42 engages the bottom of the
invention will be fully apparent from the following de
dump body 18 when the dump body is raised to the up
scription when taken in conjunction with the annexed
wardly sloping position as shown in FIGURE 2. When
drawings, in which:
the body is in the horizontal position as in FIGURE 1,
FIGURE 1 is a fragmentary elevational view of a dump
the stop 42 is out of engagement with the dump body
truck, with the latch mechanism of the present invention
bottom.
installed thereon, showing the dump body in the horizontal
The latch mechanism of the present invention includes
position with the end gate locked;
FIGURE 2 is a fragmentary elevational view of the 35 a pair of spaced latch elements engaging complemental
holding means carried by the gate 30 adjacent the lower
assembly of FIGURE 1, showing the dump body in the
end of the latter. The holding means embodies hori
upwardly sloping position with the end gate released and
Burley S. Livingston, P.0. Box 183, Moorhead, Miss,
and Marvin Terrell, Indianola, Miss.
Filed Jan. 31, 1958, Ser. No. 712,500
3 Claims. (Cl. 298-23)
open;
FIGURE 3 is a sectional view, taken on the line 3—3
zontally disposed studs 54 and 56 which project outwardly
of FIGURE 1;
curved arms 58 and 68 each carried on a cylindrical mem
FIGURE 4- is a sectional view, taken on the line 4-4 of
FIGURE 1;
FIGURE 5 is a sectional view, taken on the line 5—-5 of
FIGURE 4;
from the ends of the gate 30.
The latch elements are
ber 62 and 64, respectively, mounted upon the projecting
end portions of the stub shafts 46 and 48, as shown in
FIGURE 4. A crank member 66 is carried upon the inner
end portion of the shaft ‘46 and a similar crank member
FIGURE 6 is a sectional view, taken on the line 6——6 45 68 is carried upon the inner end portion of the shaft 48. 7
Means is provided connecting the arms '58 and 60‘, con
stituting the latch elements, to the shaft 34 for movement
of FIGURE 4; and
FIGURE 7 is a sectional view, taken on the line 7--7
of FIGURE 6.
'
therewith.
This means embodies a link member 70‘ ex
tending in parallel spaced relation with respect to the‘
Referring in greater detail to the drawings in which like
numerals indicate like parts throughout the several views, 50 frame side member 36 and another link member 72 simi
larly positioned with respect to the frame side member 38.
the latch mkechanism of the present hivention is desig
The adjacent ends of the link members 70‘ and 72 are
nated generally by the reference numeral 10 and is shown
installed upon a dump truck in FIGURES 1 and 2, the
pivotally connected by pins 71 to the arms of the crank
truck being designated generally by the reference nu
members 66 and 68, respectively, and the other adjacent
meral 12.
55 ends extend to points beyond the shaft 34 and are slidably
connected to the shaft 34. The means slidably connect
The truck 12 has a mobile body frame 14 including a
ing the link members 70 and 72 to the shaft 34 are shown
rearward end 16 of such frame and a horizontally disposed
in FIGURES 4 to 7, inclusive, with respect to the link
dump body .18 having a closed forward end 20 and an
l74
member 70. This means consists in a ?xed collar 76 se
open rearward end 22. The dump body 18 is positioned
in superimposed relation upon the frame 14 so that it is 60 cured to the link member 70 inwardly of the end remote
from the, gate 30 and another collar 78 positioned out
longitudinal with respect to the frame 14 and extends
wardly of the collar 76 and slidable on the adjacent por
inwardly from the rearward end 16 of the frame 14. The
tion of the link member 78. The link member 70‘ extends
rearward end 22 of the dump body 18 is adjacent and over
through an aperture provided in an arm 80 adjacent the
hangs the rearward end 16 of the frame 14 and the for
free end of the latter, the arm 80 being ?xedly mounted on
ward end 20 of the dump body 18 is spaced inwardly from
a sleeve 82 which is ?xedly secured to the portion of the
the rearward end 16 of the frame 14.
.1
shaft 34 intermediate the collars 76 and 78. A coil spring
A pair of hinge pins 24, only one of which is shown in
84 is circurnposed about the portion of the link member
FIGURES 1 and 2, extend through sets of trunnions 26
70 outwardly of the collar 78 and has one end bearing
rising from the rearward end 16 of the frame 14 and
through depending brackets 28 which are carried on the 70 against the collar 78 and the other end bearing against a
nut 86 which is threadedly engaged on the threaded end
underside of the dump body ‘18 adjacent the rearward end
22 of the latter. The hinge pins 24 connect the dump
portion of the link member 70‘, as shown in FIGURE 6.
3,072,438
4,
A Z-shaped bracket 38, constituting a ?xed ledge, is
carried by the frame side member 90, as shown in FIG
URE 3, and a roller 92 journalled in the free end portion
swinging movement from the vertical closed position to an
open position, of a releasable latch mechanism comprising
a shaft arranged transversely of and beneath the bottom of
of an arm 94 normally rests upon and engages the upper
said dump body adjacent the forward end thereof and
face of the free end of the bracket 88, as shown in FIG 5 journaled in said dump body for rotary movement in
URES l and 3, when the dump body 18 is in the hori
clockwise and counterclockwise directions, a pair of link
zontal position. The arm 94 projects from the sleeve 44
members arranged in parallel spaced relation positioned
on the side opposite to the stop 42. The arm 94 consti
transversely of said shaft and having one of the comple
tutes the actuating arm for the latch element of the latch
mental ends slidably connected to said shaft through an
mechanism of the present invention.
10 arm secured to said shaft for movement of said link mem
Spring means is provided which is connected to the
bers transversely of said shaft, the link members being
shaft 34 and to the dump body 18 for effecting the rotary
actuable responsive to the movement of said shaft, a stub
movement of the shaft 34‘ in the counterclockwise direc
shaft mounted on said dump body and disposed trans
tion. This spring means consists in a coil spring 96 hav
versely of each link member and adjacent the other end of
ing one end fastened in an eye formation or eyelet 98 pro 15 each of said link members, a crank member secured to
vided in the underside of the dump body 13, the other end
each of said stub shafts, the other end of each of said link
of the spring 96 being ?xed to a short projecting stub arm
members being pivotally connected to the adjacent crank
100 which is carried and ?xedly secured to the sleeve 44
member, a latch element on said stub shaft and releasably
on the end of the sleeve 44 remote from the stop 42, as
engaging means providedv on said gate adjacent the lower
shown most clearly in FIGURE 4.
end thereof for retaining said gate in the closed vertical
In operation, suitable elevating means (not shown) is
installed in the truck frame 14 and connected to the under
side of the dump body 18 in the conventional manner for
position, a ?xed ledge carried by said frame adjacent the
forward end of said dump body, an actuating arm ?xedly
carried by said shaft and normally having the free end in
raising the dump body 18 from the horizontal position to
resting engagement with said ledge, and spring means con
the upwardly sloping position. When the dump body 18 25 nected to said shaft and dump body for effecting the rotary
is in the horizontal position the roller 92 engages the upper
movement of said shaft in the counterclockwise direction,
face of the bracket 88 on the free end of the latter and
said dump body upon execution of the movement from the
effects the rotation of the shaft 34 in the clockwise direc
horizontal position to the upwardly-sloping position re
tion, stretching the spring 96. This rotation of the shaft
leasing the free end of said arm from resting engagement
34 also effects the forward movement of the associated 30 with said ledge, permitting said shaft to rotate ‘in the coun
terclockwise direction under the action of said spring
counterclockwise directions so that they engage the studs
means, elfecting the disengagement of said latch elements
54 and 56, respectively, to hold the gate 30 in the closed
from said gate-holding means, and permitting said gate to
link members 70 and 72 to turn the arms 58 and 60 in
position. Upon elevation of the dump body 18, as shown
swing under the action of gravity from the closed position
in FIGURE 2, the spring 96 urges the shaft 34 to the 35 to the open position.
limit of its counterclockwise movement and effects the
2. The combination with a mobile body frame having a
shifting of the link members 70 and 72 rearwardly and the
rearward end, a horizontally-disposed dump body having
subsequent clockwise turning movement of the arms 58
a closedv forward end and an open rearward end positioned
and 60 to the position in which they are disengaged from
upon said frame so that it extends longitudinally inwardly
the respective studs 54 and 56, freeing the gate 30‘ for 40 fromv the rearward end of said body frame with a rearward
swinging movement from the position closing the end of
end adjacent the rearward end of said body and the for
the dump body 18 to an open position responsive to the
ward end spaced inwardly from the rearward end of said
force of gravity on the gate 30.
.
body frame and pivotally connected adjacent the rearward
An important feature of the present invention is that
end to said body frame for movement from the horizontal
upon closing movement of the gate 30 should any obstruc 45 position to a position in which said dump body slopes up
tion get between the end of the dump body 18 and the gate
wardly with the forward end spaced above said body
30 and prevent the gate 30 from entirely closing the end
frame, a vertically-disposed gate extending over and clos
of the dump body 18, the arms 58 and 60, upon engage
ing the rearward open end of said body and connected at
ment of the studs 54 and 56, will be held from the com
the upper end to said dump body for swinging movement
pletely closed position and the associated springs 84 will 50 from the vertical closed position to an open position, of a
be compressed between the associated nut 86 and the adja
releasable latch mechanism comprising a shaft arranged
cent collar 78 permitting the arms 58 and 64} to engage the
transversely of and beneath the bottom of said dump body
associated studs 54 and 56 without excessive strain to the
adjacent the forward end thereof and journaled in said
arms 58 and 60 thereby preventing damage to the latch
dump body for rotary movement in clockwise or counter
mechanism until the obstruction to the gate 30 is removed. 55 clockwise directions, a pair of link members arranged in
While only a preferred embodiment of the present in
parallel spaced relation positioned transversely of said
shaft and having one of the complemental ends slidably
vention has been shown and described, other embodiments
are contemplated and numerous changes and modi?ca
connected to said shaft through an arm secured to said
tions may be made therein Without departing from the
shaft for movement of said link members transversely of
spirit of the invention as set forth in the appended claims. 60 said shaft, said link members being actuable responsive to
What is claimed is:
the movement of said shaft, a stub shaft mounted on said
dump body and disposed transversely of each link member
1. The combination with a mobile body frame having a
rearward end, a horizontally-disposed dump body having
and adjacent the other end of each of said link members,
a closed forward end and an open rearward end posi
a crank member secured to each of said stub shafts, the
tioned upon said frame so that it extends longitudinally 65 other end of each of said link members being pivotally
inwardly from the rearward end of said body frame 'with
connected to the adjacent crank mmeber, a curved arm on
the rearward end adjacent the rearward end of said body
each stub shaft and releasably engaging a stud provided on
frame and the forward end spaced inwardly from the rear
said gate adjacent the lower end thereof for retaining said
gate in the closed vertical position, a ?xed ledge carried
ward end of said body frame and pivotally connected adja
cent the rearward end to said body frame for movement 70 by said frame adjacent the forward end of said dump
body, an actuating arm ?xedly carried by said shaft and
from the horizontal position to a position in which said
normally having the free end in resting engagement with
dump body slopes upwardly with the forward end spaced
said ledge, and spring means connected to said shaft and
above said body frame, a vertically-disposed gate extend
said dump body for effecting the rotary movement of said
ing over and closing the rearward open end of said body
and connected at the upper end of said dump body for
shaft in the counterclockwise direction, said dump body
3,072,438
6
upon execution of the movement from the horizontal posi
tion to the upwardly-sloping position releasing the free end
of said arm from resting engagement with said ledge, per
each of said link members being pivotally connected to
the adjacent crank member, a curved arm on each stub
shaft and releasably engaging a stud provided on said gate
adjacent the lower end thereof for retaining said gate in
the closed vertical position, a ?xed ledge carried by said
frame adjacent the forward end of said dump body, a
disengagement of said latch element from said gate studs,
sleeve member circumposed about and ?xedly secured to
permitting said gate to swing under the action of gravity
said shaft, an actuating arm carried by said sleeve member
from the closed position to the open position.
normally having the free end in resting engagement with
3. The combination with a mobile body frame having a
rearward end, a horizontally-disposed dump body having 10 said ledge, and a coil spring connected to said sleeve and
said dump body for effecting the rotary movement of said
' a closed forward end and an open rearward end positioned
shaft in the counterclockwise direction, said dump body
upon said frame so that it extends longitudinally inwardly
upon execution of the movement from the horizontal posi
from the inward end of said body frame with the‘ rearward
tion to the upwardly sloping position releasing the free end
end adjacent the rearward end of said body frame and the
forward end spaced inwardly from the rearward end of 15 of said arm from resting engagement with said ledge, per
mitting said shaft to rotate in the counterclockwise direc
said body frame and pivotally connected adjacent the rear
tion under the action of said spring means, effecting the
ward end to said body frame for movement from the hori
disengagement of said latch elements from said gate-hold
zontal position in which said dump body slopes upwardly
ing means, and premitting said gate to swing under the
with the forward end spaced above said body frame, a ver
tically-disposed gate extending over and closing the rear 20 action of gravity from the closed position to the open posi
tion.
.
ward open end of said body and connected at the upper
end to said dump body for swinging movement from the
vertical closed position to an open position, of a releasable
References Cited in the ?le of this patent
latch mechanism comprising a shaft arranged transversely
UNITED STATES PATENTS
of and beneath the bottom of said dump body adjacent the 25
mitting said shaft to rotate in the counterclockwise direc~
tion under the action of said spring means, effecting the
forward end thereof and journaled in said dump body for
rotary movement in clockwise and counterclockwise direc
tions, a pair of link members arranged in parallel spaced
relation positioned transversely of said shaft and having
one of the complemental ends slidably connected to said 30
shaft through an arm secured to said shaft for movement
of said link members transversely of said shaft, said link
1,243,635
1,456,630
2,174,956
Schulz _______________ __ Oct. ‘16, 1917
Eaton et a1 ____________ __ May 29, 1923
Allison ________________ .._ Oct. 3, 1939
2,261,745
2,410,046
2,635,919
Sand _________________ __ Nov. 4, 1941
Burns ________________ __ Oct. 29, 1946
143,979
476,394
649,202
Australia ____________ __ Aug. 17, 1950
Canada ______________ ___ Aug. 28, 1951
Great Britain __________ __ I an. 24, 1951
FOREIGN PATENTS
members being actuable responsive to the movement of
said shaft, a stub shaft mounted on said dump body and
disposed transversely of each link member and adjacent 35
the other end of each of said link members, a crank mem
ber secured to each of said stub shafts, the other end of
Watson ______________ __ Apr. 21, 1953
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