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Патент USA US3032216

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May 1, 1962
Filed Feb. 23, 1960
5 Sheets-Sheet 1
May 1, 1962
Filed Feb. 25, 1960
3 Sheets-Sheet 5
United States atent @hfice
Patented May I, 1962
Mounted horizontally and transversely of the chassis,
Sidney S. McIntyre, §I‘., Sedro Woolley, Wash, assignor
on the beams 1tl‘—1tl, is a strong, cylindrical or tubular
reservoir 15, with opposite end portions extending equal
to The Humboldt Company, Seattle, Wash.
Filed Feb. 23, 1960, Ser. No. 10,448
4 Claims. (Cl. 212-35)
ly to opposite sides of the truck. This cylindrical reser
voir is seated in and ?xedly secured to saddles 16-16
which are, in turn, suitably bolted to the chassis beams
10--1tl, as is well shown in FIG. 8. At its opposite ends
the cylinder 15 is closed by cover plates 15'--15’ which
This invention relates to mobilized lifting and loading
mount vertically extended hydraulic jacks 17——-17' there
apparatus and it has reference more particularly to appa
ratus having a lifting and loading boom, mounted on an 10 on. These jacks have piston rods 18 that may be ex
tended downwardly to ground contact to support the
automotive truck for the lifting and loading of heavy
weight that is to be applied to the chassis and stabilize
objects onto or from the same; the present invention be
use of the boom.
ing in the nature of an improvement upon the loading
Mounted upon the cylinder 15, in the central longitu
vehicle shown in United States Patent No. 2,895,622,
dinal plane of the truck, as shown in FIG. 1, is a verti
issued to A. E. Sundin on July 21, 1959, which discloses
cal standard 19 which at its upper end mounts the pres
use on a truck bed, of a boom that is swingable in a hori
ent loading boom thereon. This boom 20 is a metal
zontal and vertical direction relative to its supporting
fabrication and is pivotally hinged at its inner end to
jack or standard; said boom being equipped at its outer
the upper end of the standard 19 by a horizontal hinge
end with an extension lever arm pivoted thereto for swing
pin 21, for vertical swinging adjustment at its outer end
ing in the vertical plane of the boom from an extended
between the downwardly inclined position, in which it
loading position to an inactive position directed inwardly
is shown in FIG. 1, and an upwardly directed position,
and along the top side of the boom.
as seen in FIG. 2. This boom is equipped at its outer
It is the principal object of the present invention to
end with an extension lever arm 23, mounted for vertical
provide an apparatus of the above stated character where
in the means employed for effecting the swinging adjust
adjustment relative thereto from a position of use or ex
ment of the extension lever arm is simpli?ed; safer in
use; less expensive to manufacture and is more positive
in its action than in prior devices of this character.
It is a further object of the present invention to pro
tension, as shown in FIG. 2 to an inactive position, folded
back along the top of the boom as shown in FIG. 1. It
vide a rack and pinion mechanism in connection with
a double acting hydraulic cylinder for the positive actua
tion of the extension lever arm between its extended and
is to be observed, particularly by reference to FIG. 2,
that the inner end of the extension lever arm 23 is
equipped with an upwardly and angularly directed
mounting arm portion 24 whereby the extension arm is
pivotally mounted and whereby it will be caused to be
disposed slightly above the line of the boom 20‘ when
folded back to its position laid along the top of the boom
Still further objects of the invention reside in the ar
rangement of parts used in the hydraulic system of con 35 as shown in FIG. 1. Both-the boom 20 and the exten—
sion lever arm 23 are of hollow form as indicated by
trol for the adjustment of the various movable parts.
their showing in FIG. 6. It is further to be understood
In accomplishing the above mentioned and various
that the hinge or pivot pin 21 whereby the lever arm 23
other objects of the invention, I have provided the im—
is mounted at the boom end, is keyed in the lever arm
proved details of construction, the preferred forms of
which are illustrated in the accompanying drawings, 40 24 against rotation, as has been shown at 27 in FIG. 6.
For the support of the extension lever 23 in any ex
tended position of adjustment relative to the boom 20
FIG. 1 is a rear end view of an automobile truck
and for its actuation to various angular positions of ex
chassis on which a loading apparatus embodied by the
tension, I provide a hydraulic cylinder 30. This is piv
present invention, is mounted; the extension lever arm
inactive positions of adjustment.
of the boom being here shown as adjusted to a retracted 45 otally mounted by a pivot pin 31 within and extends longi
position; this being herein designated as its “inactive”
tudinally of the boom, as shown in FIG. 2. The pivot
pin ‘31 is tubular and is applied through the inner end
head of the cylinder and a piston rod 32 extends from
the outer end of the cylinder and is pivotally ?xed at its
justed to an extended position.
50 outer end to the underside and lower end portion of the
angular arm 24 by a pivot pin 33 as shown in FIG 2.
FIG. 3 is an enlarged sectional View, taken on line
The primary purpose of the hydraulic cylinder 30‘ is to
3-3 in FIG. 1, showing the rack and pinion means for
effect the adjustment of the extension lever arm 23 to
rotatably actuating the boom mounting standard to swing
and hold it at various angular positions below the line
the boom in a horizontal arc.
FIG. 4 is a vertical section, taken substantially on line 55 of the boom 20.
For the purpose of swinging the extension lever 23 to a
4-4 in FIG. 8 showing the rotatable lower end mount
position folded back along the boom, as has been shown
ing of the boom standard.
in FIG. 1, I have provided a hydraulic cylinder 44} that is
FIG. 5 is an enlarged, cross-sectional detail, taken on
?xedly mounted by and extends along a top side edge of
line 5—5 in FIG. 2.
the boom 20, as best shown in FIG. 2. This cylinder
FIG. 6 is an enlarged, cross-sectional detail, taken
40 has a piston rod 41 extended forwardly therefrom to
substantially on line 6—6 in FIG. 2.
a distance somewhat forwardly of the hinge pin 21. The
FIG. 7 is a sectional detail, taken on line 7—7 in
outer end portion of this rod forms a gear toothed rack
FIG. 6.
41r which is held in operative mesh with a small diameter
FIG. 8 is an end elevation of parts of the mechanism
as seen looking through the plane of line 8-45 in FIG. 1. 65 pinion gear 43 that is keyed to one end portion of the
pivot pin 21, as shown in FIGS. 2, 6 and 7. Thus, with
FIG. 9 is a schematic showing of the hydraulic con
the retraction of the piston rod 41, the extension lever
trol system of this mechanism.
will be caused to swing from any downwardly and for
Referring more in detail to the drawings:
wardly directed position of extension, upwardly and
In FIG. 1, the automobile truck chassis is here shown
to comprise opposite, side beams 10-10 supported on 70 rearwardly to a position of substantial alignment with the
boom. It is to be explained, however, that for any back
a cross-axle 11 which is equipped at its opposite ends with
folding adjustment of the lever arm 23, the pivot pin
the usual sets of supporting wheels 12-—12.
FIG. 2 is a side view of the boom, as adjusted to a
position of use, with the extension lever arm thereof ad
connection 33 with the piston rod 32, must be withdrawn.
In order that an easy withdrawal of the pivot pin may
be accomplished, it has, as shown in FIG. 5, been equipped
at one end with a head 45 in which a pull ring 46 is
secured, and at its other end 'is equipped to receive a
locking 'pin or key 47 to retain the pin against accidental
Assuming then that the piston rod 32 has been pre
viously disconnected from arm 23, and that the parts are
disposed in the relationship as shown in FIG. 1, opera~
tion would be as follows: First, if desired or necessary,
pressure medium is applied by setting of the valves a and
e to extend the jacks 17—17' into ground contact to sup
removal or displacement.
port the weight of the load to be lifted. Then, valve b, is
At its outer end the extension arm 23 is equipped with
a hook, a securing latch or other means, as at '50 for hold
ing a load lifting cable 51 or the like.
manipulated to apply pressure medium through pipe 92
to the lower end of cylinder 70 to lift the outer end of the
boom clear of the vehicle body. If desired or required
the valve c may then be adjusted to apply pressure. me
The tubular standard 19 which supports the boom 20
dium to one or the other end of cylinder 64 to move the
at its upper end, is rotatably mounted at its lower end for
rack bar 63 to rotatably adjust standard 19 for properly
turing about a vertical post or stem 60 that is ?xed rigidly
directing the boom. Then, by a controlled application
and vertically upon the cylinder 15 as has been shown best
in FIG. 4. This post is mounted in bearings 61—6l' 15 of pressure medium, by manipulation of double acting
valve d the piston rod 32 in piston 30 may be retracted
?tted in upper and lower walls of the cylinder 15, as
to its inner limit of movement. This results then in the
shown. The tubular standard is ‘formed with a ring gear
pressure medium, as applied through pressure line 96 to
62 about its lower end portion and this end portion is
flow through pipe connection 99 into the left hand end
enclosed by a housing 62x ?xed to reservoir 15.
of cylinder 40, as seen in FIG. 9, thus to push piston rod
Supported horizontally and in interineshing contact
41 outwardly and cause rack 41;- to act on gear 43 to
with the gear 62, as seen in FIGS. 3 and 9, is a rack bar
bring the extension arm 23 outwardly and downwardly
63 that is contained longitudinally within a hydraulic
for the operative connection therewith of the piston rod
cylinder 64 as shown best in FIG. 7. At its ends this
32 by pivot pin 33. With the operating connections thus
rack ‘bar is equipped with pistons 65-65 that are recipro
cally ?tted in cylinder 64. Adjustment of therack bar 25 made, the boom 26 may be swung vertically and horizon
tally. Also, the extension arm 23, then in position as in
63 in an endwise direction operates to rotatably adjust
FIG. 2, may be swung vertically on pivot pin 21 by con
the standard 19 to swing the boom 20 horizontally, as will
trol of cylinder 36} independently of the boom cylinder 70
presently be more fully explained. It has been shown in
or in conjunction therewith. Horizontal swinging of the
FIGS. 1 and 8 that the hydraulic cylinder 64 is ?xed
upon and extends along the hydraulic storage cylinder 15.. 30 boom and load is controlled by rack bar 63 as contained
The vertical swinging of the boom 20‘ is under control
of a hydraulic cylinder 70 that is pivoted at its lower end
by a pivot pin 71 within the upper end portion of a
in cylinder 64 under control of valve 0.
laterally inclined extension of the standard. This cylinder
are individually connected with actuating lever arms at
their opposite ends as seen in FIG. 1 for selective manipu
lation of the valves a, b, c, d and e from opposite sides
of the vehicle.
has an extendable and retractable piston rod 72 that is
pivoted by a vpivot pin '73 to the medial portion of the
For this actuation of the valves, control rods extend
horizontally from end to end of cylinder 15, and these
boom 20. Extension and retractionof this piston rod 72
What I claim as new is:
effects the vertical swinging adjustment of the boom, as
l. A load lifting apparatus of the character described
between positions of FIGS. 1 and 2.
The hydraulic control system for the operation of the 40 comprising a vertical standard, ‘a boom hingedly inter
connected at one end to the upper end of said standard,
various movable parts is as shown schematically in
an extension arm hinged to and supported from the free
FIG. 9.
end of said boom, a pivot pin interconnecting said boom
In this drawing, it is observed that the cylinder 15
serves ‘as a storage tank for an adequate supply of hy
draulic pressure medium M. A pump 85 operates to
continuously draw pressure ‘medium from the reservoir
through a supply line 86 and deliver it under pressure
through a pipe 87 to a valve mechanism designated in its
entirety by 88 for delivery, selectively, therefrom to
various points of use. This .valve mechanism comprises
?ve separate and independently operable valves each
receiving pressure medium from the pump. The separate
valve mechanisms are designated in FIG. 9, respectively,
and said extension arm, a ?rst power cylinder connected
at one end to said standard and connected at its other
end to said boom, a second power cylinder connected at
. one end to said boom and releasably connected at its
other end to said extension ‘arm, a pinion gear mounted
on said pivot pin, a third power cylinder mounted on the
top of said boom, said third power cylinder including a
piston rod extending fro-m one end thereof toward said
pinion gear, a rack bar formed on the underside of said
by reference letters a, b, c, d and e and these valves are
piston rod and said rack bar engaging in operative mesh
with said pinion gear whereby the vertical swinging move
individually under control of levers, a’, b’, c’, d’ and e’,
ment of said extension lever arm is controlled by the
inward and outward extension of said piston rod.
2. A load lifting apparatus as in claim 1 including
power means for rotating said standard.
3. A load lifting apparatus as in claim‘ 1 including a
a and e, respectively, ‘to the jacks -17—17’; a pressure line
92 that leads tothe lower end of cylinder 70; a pressure 60 laterally direct arm on the upperend of said standard
and said ?rst power cylinder is connected to the free end
line 93 that leads from valve c to the right hand end of
of said arm.
cylinder 64;.and a pressure line 94 that leads from valve
d to the right hand end of cylinder 30. Valves a, b, and e
4. A load lifting apparatus as in claim 3 wherein 'said
power cylinders and power means are all hydraulically
are single acting while valves 0 and e are double acting,
and therefore there are pressure lines 95 and .96 leading 65 actuated from a single source of hydraulic ?uid.
respectively from their upper ends to the right hand ends
References Cited in the ?le of this patent
of cylinders 64 ‘and 30. Note is also to be taken that
cylinder 40 has no direct valve control but is connected at
opposite ends by pressure lines 98 and 99 reversely with
Sundin ....___- _________ __ July 21, 1959
cylinder 30. Thus, the actuation of the extension lever
arm 40,1is' incident to operation of the double acting
shown in FIG. '8. The hydraulic connections between
the valves and parts they control is shown in FIG. 9 to
comprise pressure lines 90 and 91 that lead from valves
cylinder 30.
Austria ____ ___________ __ Aug. '10, 1959
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