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Патент USA US2113044

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` April 5, 193s,
2,1 13,044
Filed April 28, 1957
' sa
59 l „
s sheets-'sheet 1
April 5, 1938. K
Filëd April 28, `193'?
3 Sheets-Sheet 2
April 5, 1938.
Filed April ‘2.8, 1957
3 Sheets-Sheet 3v
/ .
- 'Patented Àpr. 5, 1938>
PATENT ortica
Charles G. Eisenberg, Jr., Wauwatosa, -Wis., as
signer to The Heil Co., Milwaukee, Wis., a co1'
poration of Wisconsin
Application April 2s, 1937; serial No. 4139,476
4 Claims.
(CL' 295-22)
My 'present invention relates generally to im
provements in the art of controllably lifting and'
lowering relatively bulky and heavy objects, and
which are rigidly interconnected and-mounted so
aa to meet all of the above `mentioned require
relates more specifically to improvements in the
5 construction and operation of fluid pressure actu- Y
ated hoisting mechanism for effecting dumping
of the load carrying body of a dump truck or the
Generally deñned, an object of the present iu
10 venticn is to provide improved ñuid pressure ac
tuated hoisting mechanism for tiltable load car
rying bodies or the like, which is simple, compact l
and durable in construction, and which is more
over highly efdcient in operation.
It is common commercial practice in the art
of transporting materials in bulk with the aid oi
motor trucks, to utilize tiltable load carrying
bodies which are adapted to be dumped by means
Another speciñc object of the present inven- 5
tion is the provision oi a dual hoist assemblage
especially adapted for cooperation with a dump
body tiltably suspended from a vehicle chassis,
which is effectively operable regardless of un
equal load distribution and of possible distortion o
of the chassis frame.
' '
.A further speciiìc object of my invention is the
provision of a trunnion supported twin hoist
having improved distribution and control mechanism for delivering actuating ñuid to and from 35 I
the hoist cylinders at all times, without danger4
of leakage.
Still another speciñc object of the invention is -
of hydraulic hoists.- The dump body is ordinarily
to provide an improved mounting for a plurality
of simultaneously operable hydraulic hoists, 20
the truck chassis, and the hoists of which there
may be one or_ more, 'usually have their cylinders
pivotally suspended from the chassis beneath the
front of _the body and are provided with piston
rods pivotally attached directly to the bottom of
the body forwardly of the rear body suspension
wherein the cylinders 'of the hoists are overhung
with respect to a central support and are sub
pivot. In large capacity 'dump trucks, the bodies
is to provide a new. and useful twin hoist assem
blage which is adapted to be mounted as a unit
_ upon the chassis of a truck, so that the hoists
considerable distances laterally beyond each side
30 of the chassis, and it then becomes desirable to
provide two simultaneously operable hoists 1o
cated one on each outer side of the truck chassis
in front of _the rear driving wheels. Due to the
fact that these hoists are often required to lift
`35 extremely heavy loads, the cooperating hoists
which'deliver ‘the lifting force against the bodies
at varying angles, must be rigidly supported so
as to prevent relative displacement or misaline
ment of the several hoists due to unequal load
40 distribution on the >body’or possible weaving or
other distortion of the truck chassis.
The hoist
supports must also-avoid interfering with the
truck driving mechanism; and since it is prefer
. able to utilize- a hoist actuating pump which is'
preferably located near the hoists and 'driven
from the truck propelling motor,> the hoist sus'
pension structure must also be as compactas' pos
sible so as to make room for the pump andthe
liquid supply reservoir. All of these requirements
50 tend to introduce many difñcult problems in the
construction of such vdual outside mounted hy
draulic hoisting systems.
It is therefore a more specific object of my
present invention to provide an improved fluid
>>55 pressure actuated hoist system -embodying out
pivotally attached at its rear end to the rear'of '
are frequently of relatively great size and extend
side mounted trunnion supported ` dual hoists ~
jected to variable forces tending Ato throw the
same out of true alinement during normal opera
An additional specific object of my invention
.and the supports therefor will cause minimum „'50
obstruction and interference with the driving and
other mechanisms forming part of the truck as-`
vThese and other specific objects and advan
tages will be apparentfrom the following detailed 35
A clear conception of embodiments of the sev
eral features constituting the present invention,`
and of the mode of constructing and of operating
hoisting mechanisms built in accordance with 40 y
the improvement, may be had by referring to
the drawings accompanying and forming a part
of this specification wherein like reference char
actersdesignate the same or similar parts in
the variousviews.
Fig. 1 Vis a somewhat diagrammatic side view of
the rear portion of a dump truck showing the
body in normal position in solid lines, and in ex
treme tilted position in'dot-and-dash lines:
Fig. 2 is a top view of the assemblage of Fig. 1,
~ showing the outline of the dump bodyin dot-and
dash lines;
Fig. 3 is an enlarged fragmentary side view of
. the upper portion of one of the hoists and of the 55
pump for delivering huid thereto, `the control y being formed of heavy sheet metal plates welded
' valve for- the pump being shown in‘section;
together, and having a relatively wide and dat
Fig._4 is a similarly enlarged section through lower face which rests directly upon the side
the pump control valve of Fig. 3, showing the beams of the chassis I4 beneath the front portion
valve in hoist lowering position;
of the body I6. The medial portion of the box
Fig. 5 is a part sectional top view of the as~
beam lI3 has several heavy pipes 25 rigidly at
_'semblage of Fig. 3, showing one of the hoists anda part of the pump, and having the fluid control
valves thereof show'n -in section;
Fig. 6 is a transverse vertical section through
one of the iiuid return valves, the section being
_ taken along the line 6-3 oiFig. 5;
Fis. 7 isa fragmentary transverse vertical seic
tion through one side of the chassis and dump
15 body, showing a lfront view of fragments of one
of the hoists and of thel pump;
f_¿Fig 8 is a central vertical section of one type of
?hjo'ist such as may be utilized in my present im
proved system;
`Fig. 9 is a transverse vertical section through
the hoist supporting‘beam, the section being
taken through one of the pump supports; and
Fig. 10 is a front view of a modiiied type of con
nection for conducting ñuid to and from one of
the hoists through the trunnion thereof.
tached thereto and projecting therefrom as indi
cated in Fig. 9, and these pipes 25 provide a ñrm
support> to which the pump 2| is detachably se
cured in any convenient manner. The opposite
ends of the beam I3 are provided with rigid pro
jections 26 firmly secured to the beam I3 by -
welding or otherwise, and extending outwardly
beyond the opposite sides of the chassis Il; and
a set of parallel bearing bars `21, 23 is rigidly at
tached to and extends forwardly away from each
of these rigid >_end projections -26 beyond each
side of the chassis. 'I‘he front ends of the bear
ing bars 21, 23 of each set, are ñrmly intercon
nected by means of braces29; and the tops of the
' inner bars 21' and the adjacent ends of theb'races 20
29 are additionally strengthened and connected
to the top plate of the box beam I3y by means of
reenforcing plates 3B as clearly shown in Fig. 5.
The transverse beam 23 and the inner bars 21 25
While I have illustrated my invention herein as obviously provide a- rigid-horizontally disposed
being specifically embodied in a twin telescopic ' U-shaped frame which rests directly upon the
hydraulic hoisting system for an end dump body
associated with a motor _driven truck, itis not my
intention to thereby unnecessarily -restrict the
scope, since some of the features are obviously
-more generally applicable to other types of iluid
chassis I4, and the projections 26Kextend out
wardly beyond this frame. The outer bearing
bars 23 are detachably secured to the outer ends 30
of the projections 26" and of the braces 29 by nuts
as illustrated in Figs. 3 and 5; and the medial
pressure actuated hoisting systems utilizing other -3I
Portions of the bars 21, 28 o'f each set, arepro
_kinds of hoist assemblages.
` vided with aligned bearings 32‘ for swingably sup
Referring to the drawings, and more especially porting the hoists. The inner bars 21 are also
tothe typical assemblage of Figs. 1 and `2, the im
provided with depending plates 33 as shown in
, proved hoist and body system comprises in general
Figs. 'I and 8,- which coact with the opposite sides
_a vehicle chassis' I4 mounted upon rear propelling of the adjacent chassis side beams in order» to
wheels I5; a dump body It tiltably mounted upon properly position the hoist supporting structure.
40 the rear portion of the. chassis Il by means of a
Each of the hoist cylinders I9 is provided with
transverse pivot I1 and extending forwardly over an integral hollow inner trunnion 34 and with 40
the chassis and laterally beyond the opposite anintegral solid outer trunnion 35, these trun
sides thereof; and a hydraulic hoist assembly nions 34, ~35 being aligned- and located near the
consisting of a- U-shaped frame including trans
upper ends of the cylinders I 9, and also being
verse box beam I8, hoisting cylinders Il pivotally journaled in the bearings 32 so as to permit the
suspended from the op `
te ends of the beam I3, cylinders to swing in order to accommodate the 45
.pistons 20 movable wi
the cylinders I3 and -varying angularity of the axes of the pistons 20
being operatively associated with the body I3,‘and during lifting and lowering of the bod'y I3.l The
a pump 2| operable by the vehicle propelling inner hollow trunnion 35 of each cylinder I3 is
motor for supplying fluid such as oil under pres
provided with a through passage, the end of which
sure to the hoist cylinders I3 from a supply
communicates with and provides a support for
reservoir 22.
a iluid supply valve casing 36, and the opposite
The vehicle chassis I4 is ordinarily formed of
elongated parallel side beams which are suitably end of which is in open communication ~with a
diict 31 formed in the cylinder wall and leading
braced and interconnected by transverse braces. . into the lowe'r end of cylinder >I3 as illustrated in
and this chassis-I4 provides a support for the
driving mechanism for propelling the wheels II in
a wellvknown manner. 'I'he dump> body I3 may
be of any suitable size and shape, and whencon
Figs. 7 and 8. The pistons 2II of which there may
be one or more‘in each cylinder, depending upon
the lift required, are slidable upwardly within the
' cylinders I3 by liquid under pressure admitted
siderable carrying capacity is required, the body -through the ducts 31,» and are movable down
I6 usually projects sidewise considerably beyond- wardly to discharge theliquid from within the
the opposite sides of the chassis I4 as indicated cylinders Il through these ducts, by gravity act
in Fig. 2. The rear dump body pivot I1- is _ ing upon the body I6 -andpistons 2II. It is to be
mounted in suitable bearings supported by the understood ‘that the type of hoist -used may vary
65 rear end portion of the chassis I4 as shown in
" Figs. 1 and 2, and the bottom of the body I3 is
reenforced by longitudinal I-beams 23 to which
‘ the pistons 20 are attached by means of pivot
pins 24.
in_ accordance with the requirements, and that 65
either a singlefpiston or any desired. number of
telescopic pistons 20~ may be utilized.
Each valve casing 3_6 has therein a spring
pressed ballcheck valve 3l for permitting delivery
of liquid under pressure to the corresponding 70
The improved hoisting unit or assembly which
is shown dia-grammatically in‘Figs.A 1 and 2, is cylinder port 31 while preventing escape of the '
illustrated more in detail‘in Figs. 3 to 9 inclu ‘ fluid past this valve, and a second valvel casing
sive.- The single box beam I 8 which constitutes -33 is attached to each casing 33 by means of cap
the sole support for the hoist imit, has rectangu
screws Il -as shown in Figs. 3, 5 and 7. The cas
76 larly polygonal cross-section' as shown in Fig. 9, ' ings 33 are provided with ports II leading tothe
check valves 3d, andfwith passages d2 extending
around these check valves and communicating
with the ducts 3l and with the ports ¿li on the
opposite sides of the valves 38, A rotary by-pass
ously operable at the will of the operator, to
raise the «body i6 from -the position shown in
full lines in Fig. 1, to the position shown in dot
and-dash lines, and to lower the same. The
pump 2l may be placed in operation by drivingly
connecting the same to the vehicle propelling
valve d3 is located in each of the passages d2,
and these valves t3 are rigidly interconnected by
means of a cross-shaft ¿ld to the medial portion motor, and when the control valves t3, t0 are
of which a depending actuating lever d5 is at
positioned as shown in Figs. 3, 5 and 6, the pump .
tached. The port di and passage d2 of each 2l is withdrawing liquid from the supply reser
10 valve casing 39, at the inlet sides of the corre
voir 22 through the conduit 52, past the valve
spending valves 38, d3, are-in open communica- ' iii) and through the suction conduit 5i, and is 10
tion with one end of a ñexible hose connection delivering the liquid under pressure through the '
t6, and these hose connections QS extend through
enlarged slots or openings in the beam lil and
15 have their opposite ends ñxedly attached to the
pump 2i in communication withliquid distribut
v ing port lll’. The port ¿il connects directly with
the pump discharge conduit il@ and'has a ‘oy-pass
conduit 43, ports ill, hose connections d6, ports
di, and pastvthe ball valves 38 into the cylinders
le. The fluid under pressure thus admitted to 15
the cylinders I9, causes the pistons 2t therein
to move upwardly and to _thereby tilt the body
i6. 'When the body i6 has been tilted to'its eX
duct G9 leading to a control valve 5t as shown in ^ treme position, the. pump 2i will function to by
20 Figs. 3 and a‘;v and the suction conduit 5l of the
pass the excess liquid in a well'known manner, 20
pump 2l also communicates with the valve tit.
The conduit E2 which` communicates with the
valve 5B between the duct il@ and the'conduit
5i, leads to the liquid supply reservoir §22, and
25 the valve 5i) is or’ the rotary balanced type.
The control valve i5@ has a depending actuating
lever 5S which is similar to the lever d5 for the
by-pass valves 43, and the lower swinging ends
of both of the levers ¿35, 53 are joined by a
connection 5G. The lever ¿l5 is additionally pro
vided withan actuating vconnection 55 which ex
tends forwardly to an accessible actuating station,
and thearrangement is obviously such that the
valves d3, 5B are simultaneously manually oper
35 able to either deliver liquid under pressure to both
and the nonreturn valves Sßwill prevent escape
of :duid from within the cylinders l@ through the
ducts 3l’. When it is desired to lowerthe bodyl
it, it is only necessary for the operator to ma
nipulate the connections 55, 54 so as to throw 25
the valves di, 5@ to the opposite extreme position,
the valve 5@ being shown in such position in Fig.
4. When the valves are thus adjusted, the pas
sages élä are connected with the ports di, thereby
establishing free communication between the> 30
interiors of the cylinders it and the hose con
nections »3b. The ports di are also connected to
the conduit 52 through the ports ¿i9 and the valve
till, thereby permitting free escape of liquid from
the cylinders it to the reservoir 222. The weight 35
oi the body it and of the pistons til will then
cause the former to lower until the beams 23 co
act with. the cross beam it which constitutes the
support for the hoists. In this manner, the body
it may be raised or lowered at will, and may bel
retained in elevated position by proper setting
of the valves d3.
cylinders lâ, or to permit free exhaust of the
actuating iluid to the reservoir 22. The pump 2i
is oi the well known gear type, and the driving
shaft’ 5t of‘this pump is adapted to be driven
40 from the vehicle propelling motor through coun
tershaits 5l, 5S and universal joints 552. in a
well known manner. It is to be noted, that by
mounting both hoists and the pump 2l directly
Ii an assemblage such as shown in Fig. 10 is
upon the beam structure; these elements are al
used, the control of admission andl discharge of
iiuid to and from the cylinders itis effected
of possible distortion of the chassis it, and this solely by manipulation of the valve 5t. In either 45
common mounting also permits most conven- i case, the cylinders i9 VVA>`are free to swing about
ient assemblage of the entire hoisting system.
their trunnions 313, 35 s_o as to accommodate the
`While the use of the valves ¿i3 is desirable in displacement thereof. during swinging of the
order to prevent the body it from lowering acci
dentally due to breakage of the hose connections
13S or’ otherwise, these valves may be dispensed
with, and an assemblage such as shown -in Fig. l0
may be utilized. In this modified construction,
5.5 the valve çasings 36 are replaced by conduit nt
tings i533 which are permanently secured to the
inner trunnions 34 and communicate with the
cylinder ducts 37. The other ~valve casings 39
are replaced by elbow ñttings tl ñxedly attached
60 to pipes passing through the beam it and com
municating with th'e port ¿il in the pump casing,
so that the port di is 'in constant open com
body it about its pivot il. The hose connec
tions ¿it will obviously accommodate suoli. rela
tive motion of parts, and the same is true of the
swing connection shown in Fig. l0.
yThe specific formation of the hoist supports _is
en .importa-nt feature of the present invention. 55
Due to the relative great overall width of the
body ifi, the cylinders i9 are preferably located
on opposite sides of_
the chassis i6, but because
of the fact that .the hoists exert a tremendous
pressure against the body i5` during elevation of
the latter. the cylinders i9 must be ñrmly'rnount
ed. The b‘eam i8 is therefore formed with a rec
munication with the cylinder ducts 3l'. The el
tangular box ’section and has a relatively wide
bow fittings 6l have spherical sockets with which loweriace which directly engages the side beams
65 spherical projections 52 formed on the fittings
of the chassis it. The end projections 25 are
Sil, coact, and the `fittings Si); Si of each set are rigidly attached to the beam i8 -by welding, and
connected by a coupling collar $3 which permits
swinging or angular displacement of the alined the side bars 28, 'è'llar'e nrmly secured. to the pro
fittings til with the cylinders i@ relative to the jections 26 and have their forward ends rigidly
interconnected by the members 29. The top
70 fittings tl without danger of leakage.
plates 3d additionally reenforce andl stiffen the
During normal operation of the improved hoist
' assemblage‘ and the depending plates 33 secured
ing mechanism, and assuming the same to have to the bottom of the beam i8 and of the inner
been properly assembled and applied to the ve
hicle chassis lf3, the overhanging hoists at the bars 2'1. serve to prevent possible shiftingof the
beam i8 relative to the- chassis Mil The cylin
opposite side of the chassis i@ are simultane
_ ders i9 are provided with upper trunnions 34, 35 75
2,113,044 “
which are journaled directly in‘the bearings 32
transverse beam extending across and projecting .
carried by the bars 21, 28, and by providing upper - outwardly beyond said chassis and `laterally
trunnions-for the cylinders Il, bbstruction to the spaced inner bearing bars rigidly associated with
driving mechanism of the vehicle- is etl'ectively said transverse beam and resting directly upon
prevented. The mounting of~the pump 2l di
said chassis beams, outer bearingbars secured
Y rectly upon the hoist supporting beam It, is also to theouter ends of said transverse beam and 5
desirable since possible misalignment of parts is being spaced from said inner bars, and a hoist
thereby avoided, and the entire assemblage can pivotally suspended between each set of said outer
moreover be handled as a unit and applied vto
and inner bars directly adjacent to the corre
standard chassis frames.
sponding chassis beam, said hoists being opera 10
V- From the foregoing detailed description, it will ~ tively associated with said body. «
2. In combination, a vehicle chassis having op-_ '
be apparent that my present- invention> provides
improved fluid pressure actuated hoisting mecha
nism which is simple, compact and durable in
15 construction,- and which is -moreover highly em
cient in operation. The outside mounting for _the
trun'nion supported dual hoists, is `>robviously
adapted to rigidly interconnect and to effectively
>support-the hoisting cylinders so as to meet even
thel severest requirements. While the improved
twin hoist assemblage is especially adapted for
cooperation with-‘a dump<body which is tiltably
_ suspended from a vehicle chassis, this assemblage
posite sides, a dump body suspended from said
chassis, a horizontal U-shaped frame comprising
a single transverse beam crossing and projecting
outwardly beyond said chassis , and laterally
spaced inner bearing bars rigidly secured to said
transverse beam and resting directly >upon said
chassis beams, outer bearing> bars secured to the
outer ends of said transverse beam .and being 20
spaced from said inner bars, means rigidly con
necting'the ends of each set of inner and outer
bars remote from said transverse beam, and a
may also~ be utilized for other purposes, and the
hoist pivotally suspended between each set of said
hoist mounting permits the assemblage to be`-> outer and linner bars directly adjacent to the cor 25
„quickly and eilîectively applied to any support responding chassis beam, said hoists being opera
such as a vehicle chassis. The improved dis
tribution and control mechanism for delivering
actuating fluid to and from the hoist cylinders,
’ is not subject to leakage, and by utilizing~ the
valves associated directly with the inner trun
nions, the body I6 cannot drop in case the hose
connections should‘break. The improved hoist
tively associated with said body to move the same.
relative to said chassis.
3. In combination, a vehicle chassis having op
posite parallel side beams, a dump body pivotally 30
suspended from said chassis beams, a horizontal
U-shaped rigid frame comprising a single trans
verse box beam resting upon and projecting out
mounting, while providing a' iirm support for
. maintaining the hoists in alignment, does not
wardly beyond said chassis'and laterally spaced
inner bearing bars rigidly associated with said
interfere with the driving mechanism for the rear ’ box beam and resting directly upon said chassis
wheels, or-with any other structure forming'a beams, outer bearing bars secured to the outer
` part of the vehicle, and this hoist support also
provides a suitable stop for the body Ii when the
40 .latter is in lowered position. » 'I'he hoist support
extremities of said transverse beam and being
spaced from said inner bars, and a holst pivot
ally’suspended at its upper end betweeneach set 404
of said outer and inner bars directly adjacent
the corresponding chassis beam, said hoists being
ing beam also provides a convenient Support for
the pump, and the supporting assemblage may
be readily constructed ~from heavy sheet metal loperatively associated with»v said body t'o swing
the same.
rigidly interconnected by welding. The remov
able nuts associated with the end projections of v
the box beam and with the cross members 29,
also facilitate assembly` of the unit and removal
4. In combination, a vehicle chassis, a dump
,body _carried by said chassis, a U-shaped rigid
frame having inner side bars resting directly -upon
said chassis and a single cross-beam rigidly inter
It should be understood that itis not desired connecting the corresponding ends of said side
l50 to limit the present invention to the exact details ’ bars and projecting outwardly beyond the chassis, 50
-of construction or to the precise mode of opera
outer bearing lbars secured to the outer ends of
tion, herein shown and described, for various Said cross-beam and being spaced from said inner"
modifications within' the scope of the claims may bars, `and a hoist pivotally suspended between
occur to persons _skilled in the art.
each 4set of said outer and -inner bars directly
I claimz'
„adjacent the corresponding outer side of said
of the hoists in case this becomes desirable. _
A1. In combination, a vehicle chassis having op
posite side beams, a dump body carried by said
chassis, a ULshaped frame comprising' a single
chassis, said hoists being operatively associated
- with said body.
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