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Патент USA US2404577

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July‘ 23, 1946.v
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A. JACKSON
LIFTING
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2,404,517
JACK
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‘Filed July 31, 1945 '
INVENTQR
ALEX/s CIA (‘KS o/vr
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ATTORNEY
2,404,577
Patented July 23, 1946
UNITED STATES PATENT ‘OFFICE
2,404,577
LIFTING JAGK
Alexis Jackson, Westport, Conn” assign'or to
vatlim ‘S. Mak'aro?’, New York, N. Y.
Application July 31, 1943, jSerial-No. ‘496,883
6 Claims. (01. 254--s)
1
.
nected together as by a ‘rod 'or tube, l’3. '
operated by a ?uid under pressure.
My invention has for its ‘object to provide a
lifting jack which can be used for lifting such
objects ‘as automotive vehicles from relatively
low elevation, as, for instance, when a tire on
the vehicle wheel is ‘?at and there is very little
room under the axle to place a lifting jack 10
therein.
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2
supporting wheels 12. The lifting ‘arms are ‘con-j
My invention relates to lifting ‘jacks and has
particular reference to portable jacks for lifting
various objects, and more particularly to jacks
1
In my United States Patent No; 2,230,250,
issued February 4, ’194‘1-,.I disclosed a. lifting jack
.
Piston H is provided with a ‘sealing ‘disc [4,
Fig. 3, made of leather or other 's'uitable‘material,
tightly ?tted in ‘the cylinder ‘and ‘fastened to the
closed top of 't'he'ipiston as by a bolt1f5.
.
A valve '16 is provided ‘on ‘top of the cylinder
for admitting compressed air into ‘the cylinder,
the valve being preferably of a type ‘used with
inner tubes of ‘automobile tires ‘so that ‘the- same
air‘ hose {which ‘is 'used "for ‘pumping ‘tires "can ‘be
used "to operate ‘by lifting jack. The valve is “of
a one-way ‘type, ‘1. ‘e., for admitting the ‘air ‘but
not I‘for discharging ‘the same. ‘For the ‘latter,
of "a similar construction, which can be placed
under a low positioned axle of an automotive 15 purpose a‘p‘i'pe ‘l1 is'p'rovided ‘extending from ‘the
closed "top ‘of ‘the ‘piston ‘l'l inside the ‘piston and
vehicle. I'have found, however, that automotive
connected with an “outer nipple l'8_ to which ‘a
vehicles ‘often have projecting parts, such as
flexible ‘hose ‘I 9 "is attached. The ‘hose is in mm
bumpers, etc»., extending far to the rear of the
coh‘n’ected v‘with a pipe :20 supported ‘inside a vhol
axle so that the jack must have sufficient ‘low
l‘ow'r‘od ‘2| ‘pivotally attached to ‘a lug '22 extend
ing from the lower end ‘of v~the ‘piston, the ‘upper
clearance practically throughout ‘its full length.
It’was found "that ‘certain 'parts ‘of the jack dis
closed in the foregoing patent interfere withl'the
insertion of the jack under long low-hung bodies.
In my present ‘invention 31 have vmodi?ed the
end of ‘the rod having‘ a ha‘n‘d'l'e'23fin ‘the form ‘of
a cross-bar; A‘valve 24 ‘is ‘provided at the top’
of ‘the pipe 20 for releasing the air ‘from the
construction by moving the ‘operating vcylinder 25 piston w'hen‘it is desired to ‘l’ow‘ertl'fe lifting arms.
The handle can be used ‘for 'moving the "lifting
to the rear of the lifting arms, and ‘eliminating
jack around and "for "p‘lacin'g'i't 'in "an operative
other connecting parts which may interfere with
position under an automobile.
"
‘
the insertion of the jack in its place.
For‘loc’ki'ngthe lifting "a'rmsin a raisedp‘os'iti‘on
My invention is {more fully described in the
accompanying ‘speci?cation and drawing, in 30 as shown in Fig. 'atthe'piston 11 ‘has ho1es‘25tfor
which:
a lock'in'g'rod7'2'6 which, when ‘in's'erte'dl'n a cor‘
"
responu‘mgnme, prevent the jcyunaer ‘?'ifrorn slid
Fig. 1 is an elevational view of ‘my jack in an
ing down o‘ve’r‘the piston.‘ The ‘red, when 'no't‘i‘n
inoperative position with the lifting-arm lowered;
use, is ‘heldin a'soéket‘2'l at the 'si‘de'o‘f'th‘e cyliné
Fig. 2 is a similar view of the jack in an opera
tive position with ,thevlifting arm raised;
35
Fig. 3 is a sectional detail view of the operating
cylinder; and
.
.
Fig. 4 is1a top plan'view of the jack.
My lifting jack consists of a frame‘formed of
deri? as shown in Fig. 1.
V
'
"
"
Distance from‘t'he' rear'en'ds “ofitheIlift'ing arms
to the common shaft '1 'iis‘considerably, smaller
than the distance from the's'ha‘ft "I ‘to the'ffi‘ont
a- pair of arms I connected at the front by‘ an
ends of the vlifting arms so that ~the arms can 'be
raised to a considerable height with a relatively
axle 2 with supporting wheelss. The rear ends
small ‘travel of the piston.
of the arms l, are pivotally mounted on trunnions
4 extending from a reinforcing ring 5 on the open
that both sets “of arms, _:-frame and lifting, Ilie
lower end of a cylinder 6, the upper end of the
cylinder being closed.
_ The frame arms ! are rotatively mounted on a
' I
l
I
My lifting 'tjackthas anfimportant advantageln
very low as is shown in‘Figf-l so that ‘the'fjac'k _
45 can be moved under a ve‘r'ylo'w' vehiclejwith'out
interference with long overhanging parts 'suénas
bumpers, trunk'saspa're 't'ire's, ‘etc. "
.
P
1
shaft ‘l which ‘also mounts a lifting member con
It will be noted, particularly from
'1’, that
sisting of a pair of ‘lifting arms 8 with hooks 9
at the front ends for engaging an object to‘ be
‘the motor is inclined upwardly and away ‘from
raised such ‘as an axle of‘ an automotive vehicle so the frontjend of the jack ‘when in collapsed con- dition, thus'further increasing bumpervclear'ance.
,(not shown). The rear ends of the lifting arms
atejpivotally mountedonarod |__0 passing through
the lower end of’ a tubular piston ll sliding in.
It will furthenmore be noted that the ‘horizontal
pivdt "shaft "It connects the ‘frame “an'dflifting
members in ‘sueh'm'anner ‘as't‘o cause .tnes’e'mem-L
thecylinder 6_. Theends of the rod in extend
,‘beyond ‘theiend-s ‘of the-frame arms fl‘ and ‘‘mount . 55 bersftoféxecute Ta indvem'entinot‘uniixea connnon
2,404,577
>
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' 3
being pivoted to the rear end of said lifting arms,
scissors and'that this pivot shaft divides these‘
said cylinder being disposed’ above said piston,
members into relatively long front levers and rel
atively short rear, levers; that the stroke of the
I‘ motor is only slightly greater than the length
said cylinder having its upper end closed and its
lower end located between the rear ends of said,
frame arms and pivoted thereto, means for sup
of the rear levers; that the lifting member occu
pies a, position nearer the vertical and the frame
occupies a position near the horizontal when the
plying said motor with ?uid for causing the pis
ton and cylinder to move apart thereby raising
jack is in its highest raised position. It will also
the frontendof said lifting member, and causing
be seen that the distance between, wheels 3 and
it to move from a position_of'relatively low sta
It will be seen from a comparison of Figs. 1 and v2 1'
bility to‘ a position of relatively great stability.
3. In a scissors
type, high lift jack, a frame;
I
means to movably support the front end of the
that because of this dissymmetry of construction . >
frame on a supporting surface, the rear end of
I2, de?ning the wheel or supporting base con
10
tracts comparatively little as the jack is raised, - >_
said frame being, adapted to be raised from said
the stability of the jack changes from the position
of relatively small stability shown in Fig. 1, to the is supporting surface, a lifting member pivotally
position of relatively great stability shownin Fig.
connected to the frame by a pivoting member
2, when the jack is raised from its collapsed posi
tion to its highest'position.
' which divides said frame and lifting member into
relatively short rear levers and relatively long
front levers, the front end of the lifting member
any isuitablegtype for operation by compressed‘ 20 being adapted to engage the load to be lifted,
means for vmovably supporting the rear end of
air or other elastic ?uid, ‘also to be operated by‘
said lifting member on said supporting surface,
an incompressible ?uid such as oil, or by com-‘
a motor comprising expansible members pivotally
bination of the two ?uids.
,
connected to the rear ends of said'frame and lift
It is understood that my lifting jack may be‘
further modi?ed without departing from the 25 ing member for moving said rear ends apart, said
motor members being expansible from a position
spirit of the invention, as set forth in the ap
representing a substantially collapsed condition
pended .claims. ,
g
I
of the jackto a distance at least equal to the
I claim as my invention: a
length of said shorter levers and representing a
l. A lifting jack comprising a frame; means to,
condition where said lifting member is nearer the.
movably support the front end of the frame on 30 vertical
than horizontal while said frame member
the ground, the rear end of the. frame being
‘ It is understood that the cylinder may be of‘
is‘ nearer ‘horizontal than vertical.
adapted to be raised from the‘igr‘o'und; a lifting
7
4;‘ In a scissorstype, high lift'jack, a frame,
member'pivotally connected to the frame by a
alifting member," pivot means connecting said '
horizontal pivoting member, the front end of the
lifting member being adapted to engage an ob 35 frame and lifting member, said pivot means divid
ing said frame and lifting member into relatively
ject to be lifted‘; means to movably support the
long front levers and relatively short rear levers,
rear'end of the lifting member on the ground; a
devices for movably supporting the rear end of
motor consisting of two telescopic members, one
said lifting member and the front end of said
telescopic member being pivotally connected to
on a supporting surface, the front end of
the rear end of the frame, the other telescopic 40 frame
the lifting member having a load-elevating por
member being pivotally connected to the ‘rear end
tion located adjacent the front’ end of the frame
of the’ lifting member, one telescopic member be
the jack is collapsed so that the jack has
ing in the form 'of'a cylinder closed at the outer ' when
relatively low stability when in such collapsed
and open at theinner end; the other telescopicv _
member being in the form of a piston slidably 45 condition, a relatively short stroke motor compris
ing movable members pivotally connected to the
?tted in the cylinder; a one-way valve on the cyl-‘
rear ends of said lifting member and frame for
inder for admitting a ‘?uid under pressure in the‘
elevating the latter, whereby the stroke of said
motor raises said load-elevating portion’ propor
cylinder thereby causingjthe lifting member to
be’ raised; va handle extending from the rear end
‘ tionally more than the stroke of said motor'and
, ofthe motor; a pipe extending from the handle
substantially increases the stability of said jack‘
into’. the cylinder; and a manually operablevalve;
from its condition of relatively low stability to a
on the pipe for, releasing the ?uid from the cyl
condition of'relatively great stability.
L
V5; In a scissors type, high lift jack, a frame,
inder thereby allowing the lifting member to vbe
lowered.
I
" '
a lifting member, pivot means connecting said
frame and lifting member, said pivot means divid
2. In a lifting jack for lifting one ‘end of an
automotive vehicle high off a'supporting surface,‘
said jack comprising’ a frame having av pair of‘
ing said frame and lifting member into relatively
spaced arms, a cross-member secured to said arms
near their front ends, wheels journaledr on said
devices for movably supporting the rear ‘end of
frame to 'movably support the front end of the‘
frame, on the supporting surface‘, the rear end of
the frame being adapted to be raised from the
long front levers and relatively shortrear levers, ,
60
supporting surface, a lifting member comprising
spaced arms positioned within said frame arms, 7
said lifting member and the front end of said
frame on a supporting surface, the front end of V
the lifting member having a load-elevating portion located adjacent the front end of the frame .
when thejack is collapsed so that the jack has
ber dividing said frame and lifting member into
relatively long front levers and relatively ‘short
rear‘ levers, the front end of the lifting member
relatively small stability when in low position, a
relatively short stroke motor operating between
the‘ rear ends of said lifting member and frame
for elevating the latter, the dissymmetrical ar
rangement of said pivot means causing the ele
being adapted to engage one end of said auto
vating movement of said motor to raise said load- ,
a horizontal pivoting member connecting said
frame arms and lifting arms, said pivoting mem
66
motivevehicle for lifting the same, Wheels ‘on the‘
elevating portion proportionally more than the
rear ends of said lifting arms for movably sup
strcke‘of said motor, and said frame to‘retain a
porting; the rear end of said lifting member on
position generally nearer the horizontal than ver
tical, and said load-elevating portion to swing ,
the supporting surface, a motor comprising a piS?
‘ton'and a cylinder, the lower end of said piston 76 further within the supporting base de?ned by said
' 2,404,577
5
supporting devices to give the jack relatively great
stability when raised.
6. In a scissors type jack for lifting an auto
mobile, a frame, a lifting member, pivot devices
connecting said frame and lifting member, said
pivot devices dividing said frame and lifting mem
ber into relatively long front levers and relatively
short rear levers, the front end of the lifting mem
ber having a load elevating portion adapted to
6
.
members having pivot connections with the rear
ends of said lifting member and frame for elevat
ing the latter; said motor pivot connections being
so located that the axis of said motor is inclined
upwardly and away from the front of the jack,
and said load elevating portion having such an
extended position adjacent the front wheeling
devices, as to provide increased bumper clearance
engage the automobile, wheeling devices for mov- -
when the jack is collapsed, such dissymmetrical
positioning of said pivot devices substantially in
ably supporting the rear end of said lifting mem
her and the front end of said frame on a support
position.
ing surface, an upright motor comprising movable
creasing the stability of the jack‘ when in raised
ALEXIS JACKSON.
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