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Патент USA US3080157

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March 5, 1963
‘
D. o. GREENHAW
3,080,147
HYDRAULIC JACK
Filed Feb. 9, 1962
2 Sheets-Sheet 1
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‘77
INVENTOR.
BY
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March 5, 1963
D. o. GREENHAW
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3,080,147
HYDRAULIC JACK
Filed Feb. 9, 1962
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DAVID
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28
INVENTOR.
O. GQEENHAW
BY
ATTORNEYS
United States Patent Q?lice
a
spears?
HYDRAUMC EAQK
David 0. Greenhaw, Rte. 8, Athens, Ala.
Filed Feb. 9, 19‘62, Sea‘. No. 172,269
11 (Ilaims. (6i. 254-42)
This invention relates to a novel hydraulic jack, espe
cially but not exclusively for service station and garage
use in elevating and positioning automobile bumper bars,
body doors, and the like, for installation on automo
biles.
The primary object of the invention is the provision
of an ef?cient, easy operating, wheel supported jack of
the kind indicated, which is rugged and mechanically
stable and of relatively simple and inexpensive construc
tion, and, which, in the case of installing a bumper bar
on an automobile, eliminates the trouble and labor of
the use, otherwise necessary, of the services of two men
and/or two jacks.
Another object of the invention is the provision, in a
jack of the character indicated above, of a transversely
elongated horizontal cradle, of L-shaped cross section in
d?dddil'l
Patented Mar. 5, lli?g
2
extends between and is suitably ?xed to the upper part
of the standard Sill and the middle of the bight portion 12-.
Fixed on and upstanding from the ends of the bight
portion 12 are ears 3%, to which are pivoted, as indicated
at as, the depressed rear ends of forwardly and upwardly
inclined levers 42, which reach forwardly beyond the
standard 39. A transverse bearing tube 44, longer than
the distance between the levers 42, is suitably ?xed on the
elevated forward ends of the levers, and has end portions
reaching laterally outwardly from the levers. A rotary
shaft 45' extends through the tube 44, and has end por
tions 46 extending outwardly of the ends of the tube.
The shaft 45 is a component of a transversely elongated
cradle
The cradle 48 comprises a ‘pair of laterally spaced
L-shaped brackets 55?, having horizontally disposed legs
52, which extend forwardly from the lower ends of ver
tical legs
The vertical legs 54 are rearwardly in
clined, relative to the horizontal legs 52, at a slight angle,
so that the vertical legs serve as ‘props to be engaged by
an object, such as an automobile bumper bar B, resting
upon the horizontal legs behind upturned checks 55 on
their forward ends, and over-balanced against the vertical
legs.
he tops of the horizontal legs and the forward
and serves as an over-center pro-p for an object resting 25 sides of the vertical legs are covered by pads 56 of such
cluding a horizontal arm and a vertical arm which is in
clined- at a- slight angle away from the horizontal arm
upon the horizontal arm, the cradle being angularly ad
justable, on a horizontal axis, to accommodate the cradle
as canvas or rubber, for harmless contact with objects.
FlGURE 3 is a vertical longitudinal section taken on
the line 3-3 of FIQURE 2, showing an automobile
The brace 63 is composed of a tubular forward sec
tion 745 and a rear rod section 76, which slides in the
The horizontal legs 52 are suitably affixed, intermediate
their ends, as indicated at 58, upon the end portions 4-6
to objects of different contours, with the object safely
of the shaft 45. The shaft ends 46 are suitably ?xed to
overbalanced against the vertical arm, while being ele
30 the undersides of the horizontal legs 52 of the cradle
vated toward the place for its installation.
brackets 59.
Other important objects and advantageous features of
A rearwardly and downwardly angled lengthwise ad
the invention will be apparent from the following de
justable brace as is pivoted, at its elevated forward end,
scription and the accompanying drawings, wherein, for
as indicated at 62, between ears 64 which extend be
purposes of illustration only, a speci?c form of the in
tween the vertical and horizontal ?anges as and 68, re
vention is set forth in detail.
spectively, of a transverse angle iron bar 76, which ex
In the drawings:
tends between and has its vertical ?ange 66 suitably
FEGURE l is a schematic perspective view of a hy
af?xed to the rear surfaces of upper portions of the verti
draulic jack of the present invention, showing a hydrau
cal legs 54 of the cradle brackets Ell. The depressed rear
lic hand pump operatively connected thereto, as an op
40 end of the brace se is pivoted, in the standard slot 32;, on
tional source of fluid under pressure;
the pivot pin 34.
FEGURE 2 is a top plan view of the lack;
bumper bar, in phantom lines, supported on the cradle;
forward section, and has longitudinally spaced holes 73,
FIGURE 4 is a front elevation of the jack taken from 45 which are selectively registrable with a single hole 8% in
the forward section to receive a headed pin 82, for loclo
the line 4-4 of FlGURE 3; and
ing the sections in adjusted relationship. The brace 6i?
FEGURE 5 is an enlarged fragmentary horizontal sec
is made adjustable in order that the vertical legs 54 and
tion taken on the line 5-5 of FIGURE 4.
the horizontal legs 52 of the cradle brackets 56 can be
Referring in detail to the drawings, wherein like num
erals designate like parts throughout the several views, 50 given angles necessary to supportably engage objects of
di'erent shapes and contours, in the manner hereinabove
the illustrated jack comprises a Unshaped horizontal base
outlined. Such adjusted angulations of the cradle 48
frame 16, having an arcuate bight portion 12 from whose
are maintained by the brace 69, in depressed, intermediate,
ends parallel spaced legs 14 extend forwardly. A cross
and elevated positions of the cradle 48.
bar 16 extends between and is ?xed to the legs 14 near
to the ends of the bight portion 12. Forward caster 55 The cradle 43 is elevated and depressed relative to the
wheels 18 are suitably iixed to the undersides of the legs
adjacent to their forward ends, in recesses Ell. A single
rear caster wheel 22 is suitably fixed to the underside of
a longitudinal strut 24 which extends between and is re
ceived centrally to the cross bar in and the bight por
tion 12. An upstanding rod 26 is suitably ?xed, at its
lower end, to the center of the bight portion 12, and has
a rearwardly extending handle 2%, on its upper end.
The rod 26, as shown in ‘FEGURE 3, is disposed at a
slight upward and rearward angle. ~
A tubular standard 30 is fixed to and rises centrally
from the cross bar is? and is disposed at a slight rear
ward angle, and has, at its upper end, a vertical slot 3?.
which opens to the upper end of the standard, with a pivot
pin 34 extending through the standard and across the slot
32. A rearwardly and downwardly angled brace bar 36
base frame 10, as indicated in full and in phantom lines
in FIGURE 3, by means of a hydraulic jack 84. The
jack $4;- cornprises a cylinder 85 having an ear 88 on its
rear end which is pivoted, as indicated at 90, to a lug 92
which is fixed to and extends at a forward and down
ward angle from the middle of the base frame cross bar;
and a piston rod Q4 working through the forward end of
the cylinder. The piston rod 94% is pivoted, at its for
ward end, as indicated at 96 between the arms of a clevis
98, which is suitably ?xed to the center of and extends
rearwardly and downwardly from the bearing tube 44.
The piston rod 94 carries a piston Hill which works be
tween the ends of the cylinder 86.
The cylinder 86 has a nipple 192, adjacent to its lower
end, on which is secured an ‘end of a hose 1M, whose
other end is secured on a nipple 106, on a hydraulic hand
‘3,080,147
’
3
pump P, or other ‘suitable source of fluid under pres
sure, which, when‘introduced into the lower end of the
cylinder, forces the piston rod 94 forwardly out of the
cylinder 86, and elevates the cradle 48 above the base
frame 10, to the desired level above the ?oor or ground.
Means for discharging the fluid from the cylinder 86 can
comprise a valve 108, on the pump P, or a similar valve
having a normally horizontal leg and a vertical leg, the
vertical leg being inclined away from the horizontal leg,
said brace being longitudinally adjustable for varying the
angle relative of the cradle to the ground on the axis of
said shaft.
,
5. A jack comprising a horizontal wheeled base frame,
an upstanding standard ?xed on the base frame, a brace
(not shown) on the jack cylinder 86, whereby the cradle
pivoted at one end on the standard, a cradle ‘pivoted on
'48 is permitted to subside toward the base frame 10.
the upper end of the brace, an extensible jack beneath
It will be seen from the foregoing that the above de 10 the brace and pivoted at one end to the base frame and
scribed jack is adapted to be easily and accurately guided,
pivoted at the other end to the cradle at a point spaced
over a ?oor or the ground, by means of the handle 28,
below the pivotal connection of the brace with the cradle,
with the object, such as the bumper bar B, safely sup
and lever means pivoted at one end to the base frame
ported in the cradle 48, for accurately positioning the
and at the other end thereof to the cradle, a bearing tube
object at ‘a desired height and location for its installa
to which the extensible jack is pivoted, a rotary shaft
tion, without having to touch the object, except as may
extending
through the. tube, said cradle being support
be required for the installation.
ably ?xed to the shaft, said cradle comprising bracket
Although there has been shown ‘and described a pre—
means having a normally horizontal leg and a vertical
ferred form of the invention, it is to be understood that
‘leg, the vertical leg being inclined away from the hori
the invention is not necessarily con?ned thereto, and that 20 zontal leg, said brace being longitudinally adjustable for
any change or changes in the structure of and in the rel
varying the angle relative of the cradle to the ground on
ative arrangements of components thereof are contem
the axis of said shaft, the base frame being U-shaped and
plated as being within the scope of the invention as de
having abight portion and parallelspaced legs,‘ said lever
?ned by the claims appended hereto.
means comprising single levers pivoted at said. one end
What is claimed is:
_
,
25 tothe base frame legs, the base frame having a cross
1. A jack comprising ahorizontal wheeled base frame,
bar extending between its legs, from which said standard
a vertically elongated, standard ?xed on and rising from
rises.
the base frame, a brace pivoted at one end on the stand
6. A jack comprising a horizontal wheeled base frame,
ard at a point ‘spaced above the base, a cradle pivoted
an upstanding standard ?xed on the base frame, a brace
on the other end of the brace, an extensible jack beneath
pivoted at one end on the standard, a cradle pivoted on
the brace and pivoted at one end to the base frame ad
the upper end of the brace, an extensible jack beneath
jacent to the lower end of the standard and pivoted at
the brace and pivoted at one end to the base frame and
its other end to the cradle at ‘a point spaced below the
pivoted at the other end to the cradle at a point spaced
:pivotal connection of the brace with the cradle, and
below’ the pivotal connection of the brace with the cradle,
lever means pivoted at one end to the base frame and 35 and lever means pivoted at one end to the base frame
at the other end thereof to the cradle at a location adja
and at the other end thereof to the cradle, a bearing tube
cent to said other end of the jack.
2. A jack comprising a horizontal wheeled base frame,
an upstanding standard ?xed on the base frame, a brace
pivoted at one end on the standard, a cradle pivoted on
the upper end of the brace, an extensible jack beneath
the brace and pivoted at one end to the base frame and
pivoted at its other end to the cradle at a point spaced
below the pivotal connection of the brace with the cradle,
to which the extensible jack is pivoted, a rotary shaft
extending through ‘the tube, said cradle being support
ably ?xed to the shaft, said cradle comprising bracket
means having a normally horizontal leg and a vertical
leg, the vertical leg being inclined away from the hori~
zontal leg, said brace being longitudinally adjustable for
varying the angle relative of the cradle to the ground on
the axis of said shaft, the base frame being U-shaped and
and lever means pivoted at one end to the base frame and 45 having a bight portion and parallel spaced legs, said lever
at the other end thereof to the cradle, a bearing tube to
which the extensible jack is pivoted, a rotary shaft ex
tending through the tube, said cradle being supportably
means comprising single levers pivoted at said one end
to the base frame legs, the base frame having a cross bar
extending, between its legs, from which, said standard
?xed to the shaft.
rises, said bearing tube extending between and fixed to
3. A jack comprising a horizontal wheeled base frame, 50 the other ends of the levers.
.
.
an upstanding standard ?xed on the base, frame, a brace
7. A jack comprising a horizontal wheeled base frame,
pivoted at one end on the standard, a cradle pivoted on the
an upstanding standard ?xed on the base frame, a brace
upper end of the brace, an extensible jack beneath the
pivoted at one end on the standard, a cradle pivoted on
brace and pivoted at one end to the base frame and pivoted
the upper end of the brace, an extensible jack beneath the
at its other end to the cradle at a point spaced below the 55 brace and pivoted at one end to the base frame and
pivoted at the other end to the cradle at a point spaced
means pivoted at one end to the base frame and at the
below the pivotal connection of the brace with the cradle,
other end thereof to the cradle, a bearing tube to which
and lever means pivoted at one end to the base frame
pivotal connection of the brace with the cradle, and lever
the extensible jack is pivoted, a rotary shaft extending
and at the other end thereof ‘to the cradle, a bearing
through the tube, said cradle being supportably ?xed to 60 tube to which the extensible jack is pivoted, a rotary shaft
the shaft, said cradle comprising bracket means having
extending through the tube, said cradle being support-ably
a normally horizontal leg and a vertical leg, the vertical
?xed to the shaft, said cradle comprising bracket means
leg being inclined away from the horizontal leg.
_
having a normally horizontal leg and a vertical leg, the
4. A jack comprising a horizontal wheeled base frame,
vertical leg being inclined away from the horizontal
an upstanding standard ?xed on the base frame, a brace 65 leg, said brace being longitudinally adjustable for vary
pivoted at one end on the standard, a cradle pivoted on
ing the angle relative of the cradle to the ground on the‘
the upper end of the brace, an extensible jack beneath the
axis of said shaft, the baseframe being U-shaped and
brace and pivoted at one end to the base frame and piv
having a bight portion and parallel spaced legs, said
ot'ed at its other end to the cradle at a point spaced be
lever means comprising single levers pivoted at said one
low the pivotal connection of the brace with the cradle, 70 end to the base frame legs, the base frame having a cross
and lever means pivoted at one end to the base frame and
bar extending between its legs, from which said standard
at the other end thereof to the cradle, a bearing tube to
rises, said bearing tube extending between and ?xed to
which the extensible jack is pivoted, a rotary shaft ex
the other ends of the levers, said shaft having end por
tendingthrough the tube, said cradle being supportably
tions extending beyond the ends of the bearing tube to
?xed‘ to the shaft, said cradle comprising bracket means 75 which the cradle is ?xed.
3,080,147
5
8. A jack comprising a horizontal wheeled base frame,
an upstanding standard ?xed on the base frame, a brace
pivoted at one end on the standard, a cradle pivoted on
the upper end of the brace, an extensible jack beneath
the brace and pivoted at one end to the base frame and
pivoted at the other end to the cradle at a point spaced
below the pivotal connection of the brace with the cradle,
and lever means pivoted at one end to the base frame and
at the other end thereof to the cradle, a bearing tube to
6
lever means comprising single levers pivoted at said one
end to the base frame legs, the base frame having a cross
bar extending between its legs, from which said standard
rises, said bearing tube extending between and ?xed to
the other ends of the levers, said shaft having end por
tions extending beyond the ends of the bearing tube to
which the cradle is ?xed, the cradle bracket means com
prising a pair of transversely spaced brackets having their
horizontal legs ?xed to the end portions of the shaft,
which the extensible jack is pivoted, a rotary shaft ex 10 and a transverse bar extending between and ?xed to the
vertical legs of the brackets, the brace being pivoted to
tending through the tube, said cradle being supportably
the transverse bar, said brace ‘comprising telescoped sec
?xed to the shaft, said cradle comprising bracket means
tions, and means for locking the sections in adjusted rela
having a normally horizontal leg and a vertical leg, the
tionship.
vertical leg being inclined away from the horizontal leg,
10. A jack comp-rising a base frame, a ?xed standard
said brace being longitudinally adjustable for varying the
rising
from the base frame, a normally upwardly angled
angle relative of the cradle to the ground on the axis of
brace having a depressed end pivoted on the standard, a
said shaft, the base frame being U-shaped and having a
cradle pivoted on the elevated end of the brace, normally
bight portion and parallel spaced legs, said lever means
upwardly tangled lever means having a depressed end
comprising single levers pivoted at said one end to the
base frame legs, the base frame having a cross bar ex 20 pivoted to the base, the elevated end of the lever means
being pivoted to the cradle on a level below the elevated
tending between its legs, from which said standard rises,
end of the brace, and a normally upwardly angled ex
said bearing tube extending between and ?xed to the
tensible jack having a depressed end pivoted to the base
other ends of the ‘levers, said shaft having end portions
in the region of the standard, and means pivoting the
extending beyond the ends of the bearing tube to which
elevated
end of the jack to the cradle on an axis spaced
the cradle is ?xed, the cradle bracket means comprising a
below
the
elevated end of the lever means.
pair of transversely spaced brackets having their horizon
11. A jack comprising a base frame, a ?xed standard
tal legs ?xed to the end portions of the shaft, and a trans
rising from the base frame, a normally upwardly angled
verse bar extending between and ?xed to the vertical legs
brace having a depressed end pivoted on the standard,
of the brackets, the brace being pivoted to the transverse
a cradle pivoted on the elevated end of the brace, normal
30
bar.
ly upwardly angled lever means having a depressed end
9. A jack comprising a horizontal wheeled base frame,
pivoted to the base, the elevated end of the lever means
an upstanding standard ?xed on the base frame, a brace
being pivoted to the cradle on a level below the elevated
pivoted at one end on the standard, a cradle pivoted on
end of the brace, and a normally upwardly angled ex
the upper end of the brace, an extensible jack beneath
the brace and pivoted at one end to the base frame and 35 tensible jack having a depressed end pivoted to the base
pivotxl at the other end to the cradle at a point spaced
below the pivotal connection of the brace with the
cradle, and lever means pivoted at one end to the base
frame and at the other end thereof to the cradle, a bear
ing tube to which the extensible jack is pivoted, a rotary 40
shaft extending ‘through the tube, said cradle being sup
portably ?xed to the shaft, said cradle comprising bracket
means having a normally horizontal leg and a vertical
leg, the vertical leg being inclined away from the horizon
rtal leg, said brace being longitudinally adjustable for
varying the angle relative of the cradle to the ground
on the axis of said shaft, the base frame being U-shaped
and having a bight portion and parallel spaced legs, said
in the region of the standard, and means pivoting the
elevated end of the jack to the cradle on an axis spaced
below the elevated end of the lever means, said brace
being longitudinally adjustable.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,819,378
2,036,654
2,512,150
2,605,999
2,785,807
Nilson ______________ _._ Aug. 18,
Stieler _______________ __ Apr. 7,
Geren _______________ __ June 20,
Schultz ______________ __ Aug. 5,
Prowinsky ___________ .... Mar. 19,
1931
1936
1950
1952
1957
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