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Патент USA US3062512

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Nov. 6, 1962
3,0625500
|_. |_. ARNES ETAL
JACK
Filed Aug. 26, 1957
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Nov. 6, 1962
|_. |_. ARNES ETAL
3,062,500
JACK
Filed Aug. 26, 1957
6 Sheets-Sheet 2
Nov. 6, 1962
1.. |_. ARNES EI'AL
3,062,500
JACK
Filed Aug. 26, 1957
6 Sheets-Sheet 5
mi
INVENTORS
7e A. 171v? 65,
Nov. 6, 1962
3,062,500
|_. |_. ARNES ETAL
JACK
6 Sheets-Sheet 6
Filed Aug. 26, 1957
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United States Patent O?tice
3,о6Z,5оо
Patented Nov. 6., 1362
2
1
FIGURE 8 is a front elevational view of the structure
shown in FIGURE 7, parts being sectioned for clarity;
3,0625%
JACK
_
Lyle L. Arnes and Bernard J. Zimmerman, Racine, Wis,
assignors, by mesne assignments, to Walker Manufac
turing Company, Racine, Wis, a corporation of Dela
ware
Filed Aug. 26, 1957, Ser. No. 680,176
8 Claims. (Cl. 254-7)
FIGURE 9 is a side elevational view of the truck
transmission adapter visible in FIGURE 1;
FIGURE 10 is a top plan view of the construction
shown in FIGURE 9;
FIGURE 11 is an end elevation view of the truck
transmission adapter;
.
FIGURE 12 is a perspective view of another adapter
This invention relates to jacks, and more particularly 10 attachable to the jack and useful for handling differential
units;
to devices for lifting and lowering truck transmissions,
FIGURE 13 is a top plan view of the differential
differentials and similar loads.
adapter; and
The handling of heavy duty transmissions, torque con
FIGURE 14 is an end elevational view of the adapter
verters, differentials and vehicle engine assemblies has
presented many problems, both because of the great 15 shown in FIGURES l2 and 13.
In general terms, the invention comprises an elongated
weight of such units and the con?ned space in which the
base preferably constructed of tubular elements and sup
mechanic must ordinarily work. These parts furthermore
ported by casters, the base being generally ?at and having
are usually asymmetrical both in shape and weight dis
an upwardly extending portion at one end thereof. A
tribution, thus making it di??icult to grip the assembly
pair of lifting beams and a pair of parallel links are
properly.
It is an object of the present invention to provide a
novel and improved jack which overcomes the shortcom
ings of previously known devices of this nature, and pro
pivoted to the base adjacent said upwardly extending
portion and carry a lifting platform at the outer ends
thereof in such a manner that translatory motion in an
arcuate path will be imparted to the platform when the
can easily and safely service truck transmissions or simi 25 beams and links are rocked on their pivots. A lifting
screw is rotatably and rockably supported by the up
lar units in a fraction of the time previously required.
wardly extending portions of said base and passes through
It is another object to provide an improved transmis
a traveling nut carried between said beams, a side
sion jack of this nature which requires a minimum of
mounted rotatable handle being connected to the screw
effort during the raising and lowering operations and
which will securely hold the load in all adjusted positions. 30 by bevel gearing. The screw is held in its adjusted posi
tion by a pawl and ratchet arrangement combined with
It is a further object to provide an improved jack of
frictional holding or braking means in such a manner
this character which may be easily adapted for various
that the platform may be raised or lowered simply by
types of transmissions, torque converters, differentials or
rotating the handle in opposite directions with a mini
engine assemblies with a minimum of expense and effort.
It is also an object to provide an improved transmis? 35 mum of effort. The platform is capable of being pitched
or tilted in either direction from a horizontal plane, and
sion jack of this nature which is readily maneuverable
various adapters are provided which are mountable on
into various positions beneath and away from a vehicle,
the platform in order to permit the gripping of transmis
and in which the load-engaging means may be pitched or
sions, differentials and similar units of various types.
tilted to various angles in order to accommodate loads
Referring more particularly to the drawings, the jack
in accordance with their position on the vehicle.
vides a construction by means of which one mechanic
It is another object to provide an improved transmis
sion jack of the above nature which is of strong and
durable construction but may be manufactured using con
ventional materials and with a minimum of labor ex
pense.
Other objects, features and advantages of the present
invention will become apparent from the subsequent de
scription, taken in conjunction with the accompanying
drawings.
In the drawings:
FIGURE 1 is a perspective view of the novel jack of
this invention showing the jack in its raised position and
with a transmission adapter mounted on the platform;
FIGURE 2 is a side elevational view of the jack with
is generally indicated at 211. and comprises a base gen
erally indicated at 22, this base being preferably con
structed of tubular steel elements as seen best in FIG
URE 1. More particularly, base 22 is fabricated with a
pair of longitudinal members 23 portions of Which are in
parallel relation, these members having outwardly ?ared
portions 24 at one end which are inclined upwardly as
seen in FIGURE 2. A tubular cross member 25 is
secured to the outwardly ?ared ends 24 of longitudinal
members 23 by bolts 26. Member 25 has a V-shaped
central portion between members 23 and has projecting
end portions 27 to which are secured a pair of caster
wheels 28.
The opposite ends of longitudinal members 23 are bent
upwardly in a looped manner, as best seen in FIGURE
out the adapter showing the parts in their lowered posi 55 2,
to form a pair of upwardly extending parallel stand
tion;
ards 29 which are roughly of inverted V-shape. The
FIGURE 3 is a top plan view of the jack with parts
outer ends of looped portions 29 are welded to the main
broken away and showing the frame con?guration;
parallel portions of members 23, as seen in FIGURE 3,
FIGURE 4 is a crosssectional view in elevation taken
so that the standards formed by these looped portions are
along the line 4-?4 of FIGURE 2 and showing the lifting 60 of extremely rigid construction. A lower cross pin 31
screw drive;
and an upper cross bolt 32 are secured between standards
FIGURE 5 is a cross-sectional plan view taken along
the line 5-?5 of FIGURE 4 and showing the pawl and
ratchet for holding the screw in position;
29 as seen in FIGURES 2 and 3, thus holding the stand
ards in rigid spaced relation, A pair of caster brackets 33
are secured to the outsides of members 23 at the juncture
FIGURE 6 is a fragmentary cross-sectional view in 65 of the outer ends of looped portions 29 with the longi
tudinal frame members, and a pair of casters 34 are
elevation taken along the line 6-6 of FIGURE 4 and
supported by these brackets, casters 34 being disposed
showing the manner in which the lifting yoke is connected
somewhat inwardly of casters 28 with respect to the
to the traveling nut;
longitudinal axis of the unit.
FIGURE 7 is an enlarged fragmentary side elevational
70
A lifting linkage generally indicated at '35 is provided,
-view of the head portion of the jack showing the pitch
and tilt adjusting feature;
this linkage comprising two pairs of beams 36 in spaced
aceaaoo
parallel relation. More speci?cally, beams 36 are pivot
ally supported at one end by pin 31, and are held in posi
tion by spacers 3'7 on this pin as well as a spacer 38 se
cured to intermediate portions of beams 36. The outer
ends of beams 36 carry a pin 39 for supporting the
jack lifting platform, as will be later described.
As ?best seen in FIGURES 3 and 4, a pair of pins 41
extend inwardly from intermediate portions ?of beams 36
between pin 31 and spacer ?38, and these pins support a
г1.
wardly projecting apertured ears 74 which are pivotally
secured to a pair of parallel links 75, the lower ends of
these links being pivoted at 76 to longitudinal frame mem
bers 23 adjacent pivot 31 of beams 36. As seen in FIG
URE 2, beams 36 and links 75, together with pitching
carrier 72, constitute a parallelogram linkage so that the
angular disposition of carrier 72 with respect to the
ground will remain constant as the beams are raised and
lowered.
Tilting carrier 73 is disposed above and in over-lapping
lifting yoke 42 for rocking movement between beams 36. 10
relation with pitching carrier 72, and carries a trans
A traveling nut ?43 is carried by yoke 42, this nut pref
versely apertured pin 77 at the outer end thereof, the
erably being an antifriction ball bearing nut of standard
aperture of this pin receiving the reduced end of a pitch
construction. As best seen in FIGURES 4 and 6, nut
adjusting screw 78 carried by carrier 72, as seen in FIG
43 is retained within a recess in yoke 42 and is prevented
from movement away from the yoke by a retaining pin 15 URES 7 and 8. More speci?cally, carrier 72 has a pair
44 carried by an ear 45 on yoke 42.
of cars 79 between which is rockably supported a nut 80
carrying screw 78. A washer 81 and cross pin 82 are
A lifting screw 46 is threadably disposed within nut
provided on screw 78 for preventing separation of car
43 and is supported at its upper end by a yoke 47. This
rier 73 from the screw. It will be noted that by rotating
yoke is rockably supported between the upper ends of
standards 29 by a pair of tubular pins 48 extending in 20 screw 78 in one direction tilting carrier 73 may be pitched
in a clockwise direction as seen in FIGURE 7, whereas
wardly from the standards so that only axial ?forces are
applied to the screw and has a central apertured portion
49 through which the smooth upper shank 51 of screw
46 extends. The upper end of yoke 47 is provided with a
recess within which an antifriction thrust bearing 52 is 25
disposed, a bushing 53 resting on the upper race of bear
rotation of screw 78 in the opposite direction will cause
carrier 73 to be pitched counterclockwise from the hori
zontal. Pin 77 will rotate slightly during this movement
to compensate for the change in angularity of screw 78.
ing 52. Shank 51 extends through bearing 52 and bush
thereof, these ears having apertures the common axis
of which extends in the direction of the jack base. A plat
form 84, which also serves as an adapter base, is pivotally
ing 53 which is rotatably mounted on the shank, and a
friction collar 54 is secured to the upper end of shank 51
by a pin 55. A ratchet 56 is rotatably mounted on shank
51 and is disposed between collar 54 and bushing 53. A
cover 57 encloses these parts and is secured to the end
of shank 51 by a nut 58.
As is best seen in FIGURE 5, a pair of pawls 59 and
61 are pivoted at 62 and 63 respectively to the upper end
Tilting carrier 73 has a pair of cars 83 at one side
secured to carrier 73 by means of a pin 85 which ex
tends through ears 83 and through a pair of ears 86 on
platform 34. The opposite side of carrier 73 has an
internally threaded boss 87 through which a tilt adjust
ing screw 88 extends.
The end of this screw has a con
of yoke 47 within cover 57, and are urged toward ratchet
56 by a looped spring 63 secured to both pawls. The
pawls are so positioned that they will alternately engage
the teeth of ratchet 56 each time the ?ve-toothed ratchet
nection with platform 84 similar to that between screw
78 and carrier 73. Rotation of screw 88 in one direc
tion will thus cause tilting of platform 84 in a counter
clockwise direction as seen in FIGURE 8, whereas rota
tion of screw 88 in the opposite direction will cause clock
rotates one-tenth of a revolution in a clockwise direction
as seen in FIGURE 5, and will prevent substantial coun~
wise tilting of platform 84. The range of both the pitch
ing and tilting of platform 84 is preferably su?icient to
terclockwise rotation of the ratchet. With this construc
tion, it will be seen that the frictional forces exerted by
permit the jack to accommodate transmissions or other
units in the various positions ordinarily required for as
collar 54 on ratchet 56 when a load is placed on screw
46 will prevent the free rotation of screw 46 in a counter
sembly purposes.
Although platform 84 may at times be usable for
direct engagement with certain types of loads, means
are preferably provided for adapting the novel jack to
clockwise direction as seen in FIGURE 5. However,
the application of an external rotative force through screw
46 will overcome this frictional resistance and cause rota
tion of the screw.
The means for actuating screw 46 comprises a hand
wheel 65 having a handle 66, this handwheel being se
cured to a shaft 67 rotatably mounted in a pin 48 carried
by one standard 29. The inner end of shaft 67 is sup
handle transmissions and differentials such as are in com
mon use in modern day trucks and other vehicles.
A
suitable adapter for truck transmissions (visible in FIG
URE l) is shown in detail in FIGURES 9, 10 and 11.
The adapter, generally indicated at 89, is adapted to sup
port a transmission such as is shown in dot-dash lines at
90 in the drawings. The adapter comprises a ?at rec
ported within a recess 68 in the inner portion of yoke 47.
A bevel pinion 69 is secured to the inner end of shaft 67 01 Cl tagula-r plate 91 securable to platform 84 by means of
four bolts 92 which are threaded in apertures 93 in the
and meshes with a bevel gear 71 secured to shank 51
corners of platform 84, these apertures being visible in
of screw 46 below yoke 47. With this arrangement, as
FIGURE 3. Plate 91 is provided with two pairs of
seen in FIGURE 4, rotation of hand-wheel 65 in either
spaced parallel slots 94 extending transversely to the jack
direction will cause corresponding rotation of screw 46.
When this rotation is in a clockwise direction as seen in 60 centerline, and three parallel longitudinal slots 95 adja
FIGURE 5, nut 43 will be lifted while the teeth of ratchet
cent one end of the plate, as seen in FIGURE 10. Two
56 ride past pawls 59 and 61. When the screw is rotated
pairs of brackets ?96 are disposed within slots 94, these
brackets each having an integral pin 97 at its lower end
in a counterclockwise direction, ratchet 56 will be held
stationary but collar 54 will frictionally slide on the
engageable with the underside of plate 91 and a base 98
ratchet, this rotation causing nut 43 to be lowered. The 6 engageable with the upper surface of the plate. Each
arrangement is preferably such that, with the parts prop
pair of brackets 96 is adjustable in a transverse direction
erly lubricated, the effort required on handwheel 65 will
within its corresponding pair of slots, and the upper ends
be about the same for both raising and lowering the loaded
of the brackets are provided with apertures 99, as best
jack.
seen in FIGURES 9 and ll. A shaft 101 extends through
The load-supporting means carried by the outer ends 70 the apertures in each pair of brackets, the shaft being
of beams 36 comprises a pitching carrier 72 and a tilting
pinned at 192 to one of the brackets and having a threaded
carrier 73 each of which is pivot-ally secured to beams
portion 103 extending outwardly from the other bracket.
A spacer 104 and a wing nut 165 are mounted on the
36 by means of pin 39, these two carriers being inde
threaded end of each shaft 101, and by tightening the
pendently rotatable on this pin. As is best seen in
FIGURES 7 and 8, pitching carrier 72 has a pair of down 75 wing nut the upper ends of brackets 96 may be drawn
8,062,500
6
5
of brackets in their adjusted position within slots 94.
Each shaft 161 is adapted to carry a ?oating support
196 which is slidably and rotatably mounted thereon.
A transmission adapter 89 Will be mounted on platform
84 by means of bolts 92, and a transmission 90 placed
thereon. In mounting the transmission on the adapter,
brackets 96 will ?rst be laterally adjusted and locked in
serrated edge 107. The curvature of this edge is prefer
erly accommodate the transmission casing.
ably such that it will readily engage the casing of trans
will likewise be properly adjusted in slots 95, and if neces
toward each other, thus frictionally clamping each pair
The con?guration of support 106 is best seen in FIGURE 5 place by tightening wing nuts 105, and ?oating supports
186 will be longitudinally adjusted on shafts 101 to prop
11, the outer portion of the support having a concave
sary cradle 111 will be secured to plate 91. Chain 116
mission 96 or a similar unit, the two brackets 106 cradling
the transmission between them.
-
Posts 108
10
The two outer slots 95 are adapted to adju'stably sup
port a pair of posts 108 best seen in FIGURES 9 and 10,
these posts being adapted to engage the other end of
transmission 91) being cradled by supports 106. Posts
188 comprise threaded studs locked in place by nuts 109
in any desired longitudinal position and at any height
within slots 95.
For some transmissions, an additional
cradle support may be necessary, and this support is
indicated at 111, being carried by central slot 95. More
speci?cally, support 111 comprises a somewhat V-shaped
will be wrapped around the transmission casing to hold
it in place, being secured in its tightened position by wing
nut 119 and eye bolt 118.
After the transmission has been mounted on the jack,
the jack will be wheeled under the truck and beneath its
assembly position. At this time pitch adjusting screw 78
and tilt adjusting screw 88 may be rotated to adjust the
transmission to a position parallel to that which it will
occupy when it is assembled. Rotation of pitch adjusting
screw 78 will cause tilting carrier 73 to be rocked about
pivot 39, while rotation of tilt adjusting screw 88 will
cause platform 84 to be rocked about its pivot 85 on the
member having an upwardly facing concave ?serrated edge
tilting carrier.
112 interrupted by a central clearance recess 113. Sup
After transmission 90 has been properly adjusted in this
port 111 is carried by a stud 114 lockable in any adjusted
manner, handwheel 65 will be rotated to raise the trans
postion within central slot 95 by lock nuts 115. Cradle
support 111 and posts 108 may be used alternatively or 25 mission. It should be noted that the location of the
handwheel to one side of the jack is particularly con
together as desired.
by adapter 89, a chain 116 is provided, one end of this
chain being secured to a lateral edge of plate 91 by an
venient for working in a con?ned area such as that be
neath a motor vehicle. As the handwheel is rotated, screw
46 will be rotated clockwise as seen in FIGURE 5, raising
S-hook 117. An eye bolt 118 engages the outer end or
ball bearing nut 43 and causing beams 36 and links 75 to
any desired intermediate link of chain 116, this bolt being
securable to the opposite edge of plate 91 by a wing nut
pivots.
In order to hold down a transmission 90 being carried
swing in parallelogram fashion about their respective
Due to the frictional forces exerted by collar 54
on ratchet 56, the ratchet will rotate with shank 51, the
119. The threaded length of bolt 118 is suf?cient to
thrust forces on the screw being transmitted through
permit proper tightening of chain 116 on transmission 90?.
FIGURES 12, 13 and 14 illustrate a suitable form of 35 thrust bearing 52 and yoke 47 to standards 29. When
a differential adapter for handling conventional types of
truck differentials and similar units. The adapter is gen
erally indicated at 121 and comprises a rectangular plate
122 securable to platform 84 by bolts 123. As seen in
the proper height has been reached, handwheel 65 will be
released whereupon one of pawls 59 or 61 will engage
ratchet 56. The frictional forces exerted by ratchet 56
on collar 54 will prevent rotation of screw 51, thus hold
FIGURE 13, plate 122 is provided with a longitudinal
ing the load in place. Final tilt and pitch adjustments
slot 124 and a pair of aligned transverse slots 125. An
may be made at this time if desired, adjusting screws 78
and 88 being conveniently available to the operator from
L-shaped bracket 126 is securable in adjusted positions to
slot 124 by means of a lock bolt 127. The legs of
bracket 126 are of unequal length, and slots 128 and 129
are provided in these legs. The bracket may thus be
fastened with either the long or the short leg overlying
plate 122, and the upstanding leg may be located in a
variety of positions. The outer ends of the legs of bracket
126 are provided with apertures 131 and 132 respectively
so that the upstanding bracket leg may be secured to a '
differential casing.
Transverse slots 125 are provided with a pair of posts
133 securable in adjusted positions by means of lock nuts
134. These posts comprise threaded studs rotatable by
wing nuts 135 and serve to support opposite sides of the
differential casing indicated at 136, as seen in FIGURE
l2.
the same side as handwheel 65.
After transmission 90 has been assembled to the vehicle
and disconnected from ?adapter 89, jack 21 may be
lowered by reverse rotation of handwheel 65. During
this rotation collar 54 will slide on ratchet 56 which is
held stationary, and after platform 84 has reached its
lower position the jack may be withdrawn from under the
vehicle.
In removing a transmission from the vehicle, the above
procedure will be reversed, with the jack ?rst being raised,
adapter 89 adjusted to the proper pitch and tilt positions,
transmission 90 attached to the adapter and disconnected
from the vehicle, and the jack lowered.
Should it be de
sired to handle a differential assembly or similar unit,
adapter 89 may be removed from platform 84 and adapter
121 mounted thereon. It will be apparent that other
types of adapters could be provided in order to handle
Assuming it is desired to replace a.- truck transmission
torque converters, engine assemblies or other units.
which has been overhauled, jack 21 will ?rst be placed 60 A novel jack has thus been provided which may safely
in its lowered position by rotation of handwheel 65.
and ef?ciently handle any type of heavy unit such as
Operation
This rotation will cause lead screw 46 to rotate through
the intermediary of pinion 69 and gear 71, the rotation
those mentioned above.
It has been found that the use
of a ball bearing nut together with the novel reversing
being counterclockwise as seen in FIGURE 5. During
65 arrangement results in an extremely low handle effort
this rotation, ratchet 56 will be held stationary by one of
being required for raising or lowering, even under full
the spring-urged pawls 59 and 61, but friction collar 54
loads. All controls may be easily reached by an operator
will slide on the stationary ratchet due to the force being
at one side of the jack, and the load may be quickly and
exerted on handwheel 65. Ball nut 43 will be lowered
accurately adjusted to its proper angular position.
While it will be apparent that the preferred embodi
on screw 46, causing counterclockwise swinging of beams 70
36 and links 75 to their lower position as seen in FIG
ments of the invention disclosed are well calculated to
URE 2. It should be noted that the ?ared con?guration
ful?ll the objects above stated, it will be appreciated that
the invention is susceptible to modi?cation, variation and
of base portions 24 and the V-shaped central portion of
cross member 25 will permit the jack platform to be
retracted considerably.
change without departing from the proper scope or fair
meaning of the subjoined claims.
.
3,062,500
7
What is claimed is:
1. In a lifting jack, an elongated wheeled base, a stand
ard extending upwardly from one end of said base, a
thrust bearing supported by said standard, a lifting screw
having an upper portion passing through said thrust
bearing, a friction collar ?xed to the upper end of said
and receiving said screw, and a platform mounted on the
outer end of said beams.
5. In a lifting jack, an enlongated base comprising a
pair of tubular members having parallel portions adjacent
one end of the base and ?ared portions adjacent the other
end of the base, a tubular cross member connecting said
?ared ends, said cross member being V-shaped between
said ?ared ends, a pair of casters carried by the outer
screw, a ratchet rotatably mounted on said screw between
said collar and said thrust bearing, a pawl mounted on
ends of said cross member, a second pair of casters at
said standard and engageable with said ratchet to prevent
rbtation thereof in one direction, a lifting beam pivoted 10 said one end of the base, upwardly extending looped
portions formed on said tubular members at said one end
at one end to said base, a traveling nut carried by said
to de?ne a pair of spaced standards, means securing said
beam and receiving said screw, whereby a load exerted
tubular members in spaced relation, a yoke rockably
on said beam will cause said collar to frictionally engage
said ratchet with su??icient force as to prevent rotation of
mounted between the upper ends of said standards, a
lifting screw, a thrust bearing carried by said yoke and
the screw when the ratchet is held stationary, and means
for overcoming said frictional engagement and positively
supporting the upper end of said screw, a handle rotatably
rotating said screw in either direction.
mounted on the outside of one of said standards, gearing
2. In a lifting jack, an elongated wheeled base, a pair
operably connecting said handle with said screw, a beam
of standards at one end of said base, a yoke rockably
pivoted to said base adjacent said standards, a traveling
mounted between said standards, a thrust bearing carried 20 nut rockably mounted on said beam and receiving said
by said yoke, a lifting screw having a smooth upper
screw, and a lifting platform mounted on the outer end
shank extending through said thrust bearing, a friction
collar ?xed to the upper end of said shank, a ratchet
rotatably mounted between said collar and thrust bear
ing, whereby an axial load exerted on said shank will
cause said collar to frictionally engage said ratchet, a
of said beam, said platform in its lower position being
disposed between said ?ared base portions and within
said V-shaped cross member portion.
6. In a lifting jack, an elongated base comprising a
pair of tubular members having parallel portions adjacent
pawl pivotally mounted on said yoke and engageable with
one end and ?ared portions adjacent the other end there
said ratchet to prevent rotation thereof in one direction,
of, upwardly looped portions on said tubular members
a handle and shaft rotatably mounted on one side of one
adjacent said parallel portions, said looped portions form
of said standards, gearing connecting said handle shaft
ing a pair of spaced standards, a yoke rockably mounted
between said standards, a thrust bearing carried by said
yoke, a lifting screw having a shank portion passing
with said screw, a pair of beams pivoted to said base
adjacent said standards on a common axis, a traveling nut
rockably mounted between said beams and receiving said
through said thrust bearing, a friction collar secured to
screw, and load supporting means mounted on the outer?
the upper end of said shank, a ratchet rotatably mounted
end of said beams.
35 on said shank between said collar and thrust bearing, a
3. In a lifting jack, an elongated wheeled base, a pair?
pawl pivoted on said yoke and engageable with said
of standards at one end of said base, a yoke rockably
ratchet, a handle rotably mounted on one of said stand
mounted between said standards, a thrust bearing carried
ards, bevel gearing connecting said handle with said screw
by said yoke, a lifting screw having a smooth upper
to rotate said screw in either direction, a tubular cross
shank extending through said thrust bearing, a friction 40 member connecting the flared ends of said longitudinal
collar ?xed to the upper end of said shank, a ratchet
members, caster wheels secured to the outer ends of said
rotatably mounted between said collar and thrust bearing,
cross member, a second pair of caster wheels secured to
whereby an axial load exerted on said shank will cause
said longitudinal members adjacent said standards, a
said collar to frictionally engage said ratchet, a pair of
pair of beams pivoted to said base adjacent said standards
pawls pivoted to said yoke at opposite sides of said ratchet, : on a common axis, a pair of links pivoted to said base
spring means urging said pawls against said ratchet, the
pawls being engageable alternately with the ratchet teeth
adjacent said beam pivot axis, and a carrier pivoted to
to prevent movement thereof in one direction, a handle
and shaft rotatably mounted on one side of one of said
parallelogram relation between the beams and links.
7. In a lifting jack, a tubular carriage comprising a
standards, gearing connecting said handle shaft with said
screw, a pair of beams pivoted to said base adjacent said
the outer ends of said beams and links to maintain a
pair of substantially parallel tubular elements extending
longitudinally, each of said elements comprising a sub
standards on a common axis, a traveling nut rockably
stantially horizontal portion ?aring transversely out
mounted between said beams and receiving said screw,
wardly at one end and a reversely bent portion forming
an upright loop portion at the other end, the end of said
? loop portions forming a juncture with said horizontal
portion, transverse struts between said upright loop por
tions rigidly securing the two elements together, a tubular
transverse member rigidly secured to the ?ared ends of
and means on the beams for engaging a load to be
lifted.
4. In a lifting jack, an elongated wheeled base, a pair
of standards at one end of said base, a yoke, a pair of
pins rockably supporting said yoke between the upper
said elements projecting outwardly beyond the sides
ends of said standards, at least one of said pins being
tubular, a thrust bearing carried by said yoke, a lifting 61 thereof, said outwardly projecting portions of said trans
verse member being provided with wheels, wheels pro
screw having a smooth upper shank extending through
said thrust bearing, a friction collar ?xed to the upper
vided on said elements at the junctures of the ends of said
end of said shank, a ratchet rotatably mounted between
said collar and thrust bearing, whereby an axial load
loop portions with said horizontal portions, and lifting
exerted on said shank will cause said collar to frictionally
engage said ratchet, a pawl pivotally mounted on said
right loop portions and extending toward the transverse
member.
yoke and engageable with said ratchet to prevent rota
tion thereof in one direction, a handle and shaft rotatably
nut operated by said screw, a load-supportable lifting
means secured between and to said elements at the up
8. In a lifting jack, a frame, a lifting screw, a lifting
mounted on one side of one of said standards, said handle 70 member attached to said nut, means for rotating said
shaft passing through said tubular pin, a bevel pinion
secured to said handle shaft, a bevel gear secured to said
screw and meshing with said pinion, a pair of beams
pivoted to said base adjacent said standards on a common
screw in said nut to elevate and lower said lifting member,
pawl and ratchet elements, a ?rst of said elements being
rotatably mounted on said screw, the second of said ele_
ments being secured to said frame, the elements coacting
axis, a traveling nut rockably mounted between said beams 75 to permit relative rotation in only one direction, means
3,062,500
on said frame rotatably supporting said ?rst element, said
last-mentioned means being disposed between said ?rst
element and said nut, whereby the portion of said screw
between said ?rst element and nut will be put in tension
by a load on said lifting member, and a friction member
?xed to said screw above said ?rst element and frictionally
connectable to said ?rst element with a force proportional
to the load supported by said lifting member.
References Cited in the ?le of this patent
UNITED STATES PATENTS
79,883
1,019,095
Whittaker ____________ __ July 14, 1868
Smythe _______________ _. Mar. 5, 1912
10
1,751,480
1,800,939
1,900,528
2,363,192
2,523,734
2,629,582
2,655,340
2,706,052
2,747,837
2,748,459
2,749,089
2,801,861
2,838,278
10
Howell _______________ __ Mar. 25,
Henkle ______________ _- Apr. 14,
Statz _________________ __ Mar. 7,
1930
1931
1933
Bishop et a1. __________ __ Ian. 30,
Stephenson et a1 _______ __ Sept. 26,
Stephenson et a1 _______ __ Feb. 24,
1945
1950
Dalton ______________ _- Oct. 13,
Trautman et al ________ __ Apr. 12,
Turner ______________ .._ May 29,
Orr __________________ ~_ June 5,
Feay et a1. ____________ __ June 5,
Hanson ______________ __ Aug. 6,
Johnsen _____________ __ June 10,
1953
1953
1955
1956
1956
1956
1957
1958
UNITED STATES PATENT OFFICE
CERTIFICATE OF CORRECTION
November 6, 1962
Patent No, 3,062,500
Lyle L░ Arnes et a1?,
It is hereby certified that error appears in the above numbered pat
t the said Letters Patent should read as
ent requiring correction and the
corrected below.
~?
"rectagular" read
Column 4, lines 54 and 55, for
"2,363,192" read
rectangular -?; column 10' line 4, for
??
23687192
???.,
Signed and sealed this 6th day of August 1963?,
(SEAL)
Attest:
ERNEST w. SWIDER
Attesting Officer
DAVID L- LADD
Commissioner of Patents
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