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Патент USA US3084767

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April 9, 1963
F. H. cooK
3,084,765
EXPANSIBLE GONDUIT FOR INDUSTRIAL TRUCK
Filed June 6, 1960
’ FIG. I
mm Tm.
FRED H. COOK
BY
-
ATTORNEY
United States Patent 0 "ice
1
3,084,765
EXPANSIBLE CUNDUET FGR INDUSTRIAL TRUCK
Fred H. Cook, Battle Creek, Mich, assignor to Clark
Equipment Company, a corporation of Michigan
Filed June 6, 1969, Ser. No. 34,079
15 Ciairns. (Cl. 187--9)
This invention relates to construction of expansible
conduit means, and more particularly to ?exible expansi
ble conduit means for use in lift trucks and the like.
In certain types of lift trucks, such as those known as
3,884,785
Fatented Apr. 9, 1863
2
119 and hoist motor pressure and vent conduits 24 and 26,
respectively. Mast assembly 18 is adapted to be driven in
either direction longitudinally of body portion 16 by
motor means, not shown, for engaging, lifting and trans
porting loads by means of fork 22. A lift truck of the
type shown generally herein is disclosed in detail in co
pending application Serial No. 818,869, ?led June 8, 1959,
in the name of R. Hastings, Ir. (common assignee).
An expansible conduit construction 27 is adapted to
10 supply pressure ?uid to hoist motor 20 by way of conduit
24 ‘and to receive vent ?uid from the hoist motor 20
through conduit 26. The expansible conduit construc
“retractable mast” trucks, hydraulic ?uid must be con
tion 27 comprises a pair of substantially rectangular main
veyed from the main body of the truck to the lifting
body junction blocks 28 and 30, a pair of substantially
hoist motor which is supported in the mast mechanism
intermediate junction blocks ‘32 and ‘36, a pair
for extension and retraction with the mast longitudinal 15 rectangular
of substantially rectangular mast junction blocks 40 and
of the main body of the truck.
42, a bar 44 connecting the intermediate junction blocks
It will be appreciated that a problem is encountered
62 and 36, a bar 46- p-ivotally attached at one end to said
in respect of conveying ?uid expeditiously to and from
bare 44 and pivotally connected at the other end to the
the movable hoist motor. Heretofore various arrange
rnsain body 14 of the truck, and four ?exible conduits 48,
ments of ?uid conduits have been used for the purpose
50, 52 and 54. The conduits 48, 50 and 52, 54 are con
stated, such as overhead horseshoe-shaped hoses extend
nected in pairs, as illustrated, between the junction blocks
ing between the hoist motor and the truck body, and slot
28, 32, 4t) and 38‘, 36, 42, respectively, by any conven
and swivel connection between opposite ends of a rigid
tional means, such as threaded ?ttings 56. Conduits 24
hose carrier bar which connects the hose to the truck
and 26 are connected at their one ends to junction blocks
body and the hoist motor. In the latter arrangement, 25 42 and 40, respectively, and at their other ends to oppo
the rigid hose carrier extends from an upright position
site ends of the hoist motor.
when the mast is retracted to an upwardly extending
The main body junction blocks 28 and 30‘ are secured to
diagonal position when the mast is extended.
the upper portion of main body 14, block 30 being con
The present invention eliminates the need for any slid
nected to the discharge ‘side of a ?uid pump, not shown,
ing pin connections between the hoses and truck elements,
by means of a conduit 58, and block 28 being connected
and is so constructed and arranged that a minimum of
space is required, which is at a premium in trucks of the
type contemplated. Also, my invention provides a neat
and compact construction not heretofore available, while
eliminating the possibility of fouling or kinking of the
hose conduits during operation of the mast in extension
and retraction.
It is an important object of my invention to provide an
improved expansible conduit construction in lift trucks of
the type contemplated.
Another object of the invention is to provide an ex
pansible conduit which is of relatively simple and low
co-st construction and ‘foldable in operation from an ex
tended position into a substantially vertical plane.
Still another object of my invention is to provide an
expansible hose construction which requires minimum
space in assemled relation with a ‘lift truck of the type
disclosed.
to a sump, not shown, by means of a conduit 60‘. The
mast junction blocks 40 and 42 are connected to the ver—
tically non-movable portion of mast 18 preferably at
about the same elevation as blocks 28 and 30. The in
termediate junction blocks ‘32 and 36 are located at a
substantially lower elevation than the other pairs of junc
tion blocks 1&0, 42 and 28, 30 and are attached to the
' opposite ends of bar 44; which maintains the lateral
40 , spacing thereof, and held from sideways sway by bar 46.
The conduits 48‘ and 50‘ are preferably connected to the
intermediate junction block ‘32 at the upper surface
thereof, being perpendicular thereto at the location of
connection and spaced apart in a direction transverse of
the truck. The hoses 52 and 54 ‘are similarly connected
' to the intermediate junction block 36.
Intermediate junction block passages 62 and 64 inter
connect the respective pairs of ?exible conduits. Conduit
The above objects are implemented in the present in 50 50 v‘and 52 are preferably connected to the undersides of
blocks 4%) and 42 as well as conduits 24‘ and 26.
vention by a conduit construction which is connected at
I will now describe the operation of my invention.
its one end to the main body, at its other end to the mast
When the mast 18 of the lift truck 12 is extended longi
structure, and intermediate its ends to a junction block
tudinally, it carries the mast junction blocks 40 and 42
in a manner to be described below in detail.
The above and further objects and advantages of this 55 with it, while the body junction blocks 28 and 30 remain
in relative ?xed position and lowermost disposed inter
invention will become apparent to persons skilled in the
mediate junction blocks 32 and 36 are carried to a slightly
art from the ‘following description when taken in con
junction with the accompanying drawing in which:
raised position approximately longitudinally centrally be
' tween the main body 14- and mast blocks 4-0‘ and 4-2.
FIGURE 1 is a perspective view showing diagrammati
The positional relationship of the various pairs of junction
cally a lift truck chassis in phantom view in association 60
blocks with the mast extended causes the conduits con
with the present invention;
necting said pairs of blocks to be disposed in an essen
FIGURE 2 is an enlarged eperspective view showing
tially
double-V-shaped con?guration (FIG. 2). As the
the conduit construction in extended position; and
mast
18
is actuated to a retracted position, junction blocks
FIGURE 3 is a perspective view showing the construc
32 and 36 move rearwardly and downwardly while c0n—
tion of FIG. 2 in retracted position.
65 duits 5t} and ‘54 move transversely inwardly of conduits
Referring now to the drawing, a lift truck is shown at
4-8 and 52 to a substantially vertical parallel coplanar
numeral 12 and comprises generally a main body 14 hav
relationship (FIG. 3). Spacing md sway bars 44 and
ing a pair of drive wheels 15, a forwardly extending out
as help to maintain the desired relationship during ac
rigger body portion is having a pair of supporting trail
wheels 17, and a longitudinally movable mast assembly 70 tuation of the mast.
From the foregoing it will now be apparent that I have
18 having a vertical ractuatable upright 19, a lifting hoist
provided an extremely compact, simple and generally im
motor 20, a lifting fork 22 movable vertically in upright
3,084,765
3
4
proved expansible conduit construction for applications
6. For use in a lift truck having a main body and a
such as exempli?ed herein.
While I have disclosed one preferred form of my inven
tion, I am aware that various changes may be made in
retractable mast, a pair of main body hydraulic junction
blocks, a pair of intermediate hydraulic junction blocks,
‘the form, construction, and arrangement of parts and I
to the mast, a transverse bar upon which said intermedi
do not intend to be limited except as may appear in the
claims appended.
I claim:
1. For use in a lift truck having a retractable mast and
a pair of retractable hydraulic junction blocks connected
ate junction blocks are mounted, another bar pivotally
connected to said ?rst-mentioned bar and to the main
body to prevent sideways sway of said intermediate junc
tion blocks and of said ?rst-mentioned bar, an upper sur
a main body, an expansible conduit construction compris 10 face on each of said intermediate junction blocks, two
pairs of ?exible hoses for connecting said intermediate
junction blocks with said main body junction blocks and
with said mast junction blocks, said ?exible hoses being
ing at least one ?uid junction means adapted to be con
nected to the main body of the lift truck, at least one ?uid
junction means adapted to be connected to the retractable
mast, a ?uid junction means located intermediate and
connected to said upper surfaces of said intermediate
below said main body and mast junction means, and 15 junction blocks, and passage means in each of the in
‘a pair of ?exible conduits for connecting said intermediate
termediate junction blocks for interconnecting said ?exi
junction means with said main body junction means and
ble hoses.
with said mast junction means in such a manner that
7. For .use in a lift truck having a main body and
when the retractable mast is in its retracted position said
horizontally retractable means, an expansible conduit
?exible conduits are substantially straight, parallel and 20 construction comprising a pair of ?exible conduits, means
lie in a plane which is transverse of the lift truck and
for connecting one end of one of said ?exible conduits
when the mast is in extended position said ?exible con
to the retractable means, means for connecting one end
duits form generally a V-shape.
2. An expansible conduit construction as claimed in
for connecting together the other ends of said conduits
of the other of said conduits to the main body, and means
claim 1 wherein hoist motor means is mounted in the re 25 at an elevation below the ?rst and second-mentioned con
tractable mast, and other conduit means is connected to
necting means, said last-mentioned connection means be
the mast junction means and to one end of the hoist
ing supported by said conduits so that the said last-men
motor.
3. For use in a lift truck having a horizontally retrac
table mast and a main body, an expansible conduit con
struction comprising a pair of ?exible conduits, means
for connecting one end of one of said ?exible conduits
to the retractable mast, means for connecting one end
of the other of said conduits to the main body, and means
tioned connecting means is raised upon the horizontal
extension of the retractable means and is lowered upon
the horizontal retraction thereof.
8. For use in a lift truck having a mainbody and a
retractable mast, a vertically extending cylinder hoist
motor mounted in the mast, a pair of transversely spaced
movable hydraulic junction blocks located intermediate
for connecting together the other ends of said conduits 35 the main body and mast, ?exible conduit means con
at an elevation below the ?rst and second-mentioned
necting one of said junction blocks with the main body,
connecting means, said last-mentioned connecting means
being supported by said conduits so that the said last-men
tioned connecting means is raised upon horizontal exten
the mast and one end of the hoist motor, and other .?ex
ible conduit means connecting the other of said junction
blocks With the main body, the mast and the other end
sion of the mast and is lowered upon horizontal retrac
of the hoist motor, said intermediate junction blocks
tion thereof.
being located at a substantially lower elevation than said
4. For use in a lift truck having extensible and re
?exible conduit connections to the main body and mast
tractable means and a main body, an expansible conduit
and supported by said ?exible conduit means.
construction comprising a pair of transversely spaced
9. For use in a lift truck having a main body and
junction means adapted to be connected to the main body 45 horizontally extensible and retractable means, junction
means located intermediate the main body and the ex
of the lift truck, a pair of transversely spaced junction
tensible and retractable means, and ?exible conduit means
means adapted to be connected to the retractable means,
connecting said junction means with the main body and
a pair of transversely spaced junction means intermediate
the extensible and retractable means, said junction means
and below the ?rst two-mentioned pairs thereof, a trans
being supported by said ?exible conduit means, located
verse bar upon which said intermediate junction means
at a substantially lower elevation than said ?exible con
are mounted, a pair of ?exible conduits for supporting
duit connections to the main body and the extensible
said intermediate junction means and for connecting
and retractablemeans and movable upwardly and for—
said intermediate junction means with said main body
wardly upon horizontal extension of the extensible and
junction means and with said retractable junction means,
said ?exible conduits being located in substantially paral 55 retractable means.
10. For use in a lift truck having a horizontally retract
lel coplanar relationship transverse of the lift truck when
able mast and a main body, an expansible conduit con
struction comprising ?exible conduit means connected to
the main body and to the retractable mast at substantially
?gurations when the retractable mast is extended.
5. For use in a lift truck having a retractable mast and 60 the same elevation, and means connected to said ?exible
conduit means intermediate the said connections thereof
a main body, an expansible conduit construction compris
to the body and mast at an elevation substantially lower
ing a pair of junction blocks adapted to be connected to
the retractable means is retracted and forming substan
tially parallel longitudinally extending V-shaped con
the main body of the lift truck, a pair of junction blocks
than said connections and supported by said conduit
adapted to be connected to the retractable mast of the
means, the intermediate portion of said conduit means
junction blocks, said ?exible conduits being connected to
attached to said ?rst and second mounting means, re
spectively, said second connector being located at a sub
stantially lower elevation than said ?rst and third con
nectors, and ?rst and second ?exible conduit means for
lift truck, a pair of junction blocks located intermediate 65 moving upwardly and downwardly with the said latter
means during horizontal extension and retraction of the
and below the junction blocks of the main body and of
mast, respectively.
the mast, a pair of ?exible conduits for supporting said
11. In combination, ?rst and second mounting means
pair of intermediate junction blocks and for connecting
movable relative to each other, ?rst, second and third
each said intermediate junction block with one of said
main body junction blocks and with one of said mast 70 conduit connectors, said ?rst and third connectors being
an upper surface of each said intermediate junction blocks
in transversely spaced relation, and a passage in each
of said intermediate junction blocks interconnecting said
?exible conduits.
supporting said second connector and connecting said
spear/e5
5
second connector with said ?rst and third connectors, re
spectively, such that when said ?rst and third connectors
move relatively apart said ?exible conduit means con
forms to a substantially V-shaped con?guration and when
said ?rst and third connectors move relatively together
said ?rst and second ?exible conduit means assume sub
stantially parallel relation to each other.
6
reciprocal longitudinal movement with said load engag
ing means, and an expansible ?uid conduit construction
for conveying ?uid between the body portion and said
?uid motor means, said construction including a pair of
transversely spaced junction means adapted to be con
nected to the body portion of the lift truck, a pair of
transversely spaced junction means connected to said load
engaging means, a pair of transversely spaced junction
12. In combination, ?rst mounting means, second
means intermediate and below the ?rst two-mentioned
mounting means, said ?rst and second mounting means
being movable relative to each other, a pair of ?rst con 10 pairs thereof, a transverse bar upon which said inter—
‘mediate junction means are mounted, a pair of ?exible
duit connectors, a pair of second conduit connectors, a
conduits for connecting said intermediate junction means
pair of third conduit connectors, said ?rst and third con
with said ?rst—mentioned junction means and with said
nectors being attached to said ?rst and second mounting
second-mentioned junction means, said ?exible conduits
means, respectively, said second connectors being located
at a substantially lower elevation than said ?rst and third 15 being located in substantially parallel coplanar relation
connectors, and a pair of ?exible conduit means for sup
porting said pair of second connectors and connecting
said pair of second connectors with said pairs of ?rst and
ship transverse of the lift truck when said lead engaging
means is disposed adjacent the body portion and forming
substantially parallel longitudinally extending V-shaped
con?gurations when said load engaging means is actuated
third connectors, respectively, in such a manner that
when said pairs of ?rst and third connectors move rela 20 away from the body portion.
15. For use with a lift truck having an elongated frame
tively apart with said ?rst and second mounting means
and a body portion mounted thereon, load engaging means
said pair of ?exible conduit means form a substantially
double V-shaped con?guration and when said pairs of
?rst and third connectors move relatively together said
pair of ?exible conduit means are substantially parallel
and coplanar.
13. For use with a lift truck having an elongated frame
and a body portion mounted thereon, load engaging
means supported on the frame for reciprocal longitudinal
movement relative thereto, ?uid motor means arranged
for reciprocal longitudinal movement wtih said lead en
gaging means, and an expansible ?uid conduit construc
tion for conveying ?uid between the body portion and
supported on the frame for reciprocal longitudinal move‘
ment relative thereto, ?uid motor means arranged for
reciprocal longitudinal movement with said load engaging
means, and an expansible ?uid conduit construction for
conveying ?uid between the body portion and said ?uid
motor means, said construction including a pair of junc
tion blocks adapted to be connected to the body por
tion of the lift truck, a pair of junction blocks adapted
to be connected to said load engaging means, a pair of
junction blocks located intermediate and below ‘said ?rst
two-mentioned pairs thereof, a pair of ?exible conduits
for ‘connecting each said intermediate junction block with
said ?uid motor means, said construction including a
pair of ?exible conduits, ?rst junction means for connect 35 one of said ?rst-mentioned junction blocks and with one
of said second-mentioned junction blocks, said ?exible
ing one end of one of said conduits to the body portion,
conduits being connected to an upper surface of each said
second junction means for connecting one end of the
intermediate junction block in transversely spaced relation,
other of said conduits to said load engaging means and
and a passage in each of said intermediate junction blocks
third junction means for connecting together the other
ends of said conduits at an elevation below said ?rst and 40 interconnecting said ?exible conduits.
second junction means so that said third junction means
References Cited in the ?le of this patent
is raised upon longitudinal movement of said load en
gaging means in one direction and lowered upon longi
UNITED STATES PATENTS
tudinal movement of said load engaging means in the
2,554,930
Ulinski ______________ __ May 29, 1951
other direction.
45 2,560,438
Gunn _______________ __ July 10, 1951
14. For use with a lift truck having an elongated frame
2,736,445
Hoban ______________ __ Feb. 28, 1956
and a body portion mounted thereon, load engaging means
supported on the frame for reciprocal longitudinal move
ment relative thereto, ?uid motor means arranged for
2,788,148
Parcell ______________ __ Apr. 9, 1957
2,791,293
Schenkelberger ____ __,___ May 7, 1957
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