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Патент USA US2124314

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July 19, 1938.
Filed May 22, 1957.
Patented ‘July 19, 1938
., Russel Robison, San Francisco, and George H.
Mosel, Burlingame, Calif.
Application May 22, 1937, Serial No. 144,212
6 Claims.
(01. ‘254-98)
bring the jack screw, directly under any part,
“ This invention relates to screw ‘jacks gener
ally, but particularly to a. screw jack for special
4 use in servicing automobiles. ‘The principal ob
f ject of the invention‘isgto provide a portable
quick operating screw'jack‘with a ‘frame adapt
ed to'cooperate with the frameof an automo
bile, hoist for lifting any desired part of an
automobile already elevated. on the hoist.
A particular object of the invention is a screw
hoist of this type provided with a split nut for
quick adjustment and/or removal of the screw.
A further feature is to provide a special split
of the automobile above.
Theuse of a special split nut through which
our jack screw, passes permits almost‘ instan
taneous initial ‘adjustment to position ‘before
applying the lifting force, and as quick a re-‘
moval of the screw.
Other features are the adjustability of the
carriage, construction of the frame, extendibilityf
to straddle any hoist frame or garage pit, etc.‘
In the drawing, I, 1, indicate in dotted lines
nut in a screw jack which‘ will automatically
the frame or horizontal spaced steel beams of
the conventional automobile cylinder or hydraulic
_lock itself against opening‘ when pressure is
hoist, and ‘upon which automobiles are elevated:
A further object is toprovide a construction
which may be packed flat on its frame.
A still furtherfeature is ,to provide a sup
porting bracketwhich may be extended to strad
dle any automobile hoist frame or garage pit.
Other features and advantages of the construc
tion will appear in the following description and
accompanying drawing.
‘In the drawing: _
Figure 1 is a side elevation of our improved
bracket jack, indicated," as supported on the
frame of a cylinder type automobile hoist.
Figure 2 is a plan view of our jack.
Figure 3 is a cross section of Figure 1, as seen
3054 from the line 3-p-3 thereof. a
Figure 4 is an enlarged cross, section of the
split nut and its carriage as seen from the line
4-4 of Figure 2.
Figure 5 is a detached vertical section of one
"*iaw of the split nut.
jack frame supported on the lower ‘flanges of
the beams, and with the jack-screw 3 of our
jackpositioned in about the middle of the frame
as for applying. against a portion of the elevated
automobile not shown.
preferably made extendible to straddle any dis
tance between hoist beams, I, or across any
garage pit for use on cars where the work is
done. from,the pit. In the drawing the ex
tendible frame is shown composed of an outer. >
section having two angleiron sides 4 and a nar
row or inner section having two similar angle
iron‘: sides 5 slidable longitudinally within the
wider section, and within which inner section
is slidably supported a carriage 6 which supports
thetwo sections ‘I, 1’ of the split nut which en
gage the jack-screw 3.
The, side bars or angle irons 4 and .5 are
spaced .at their ‘outer end by members l!v which
of the car still further up’ in reference ‘to the
springs for greasing and/or adjusting the same,
l_l passing through the lower or horizontal webs.
of our bracket jack applied directly to the cyl
inderof a cylinder type automobile hoist.
Before describing the invention in detail, it
simplify the understanding of the same to
'40 ‘will
state that our special-bracket jack is principally
intended for use in connection with service sta
tion hoists of the cylinder or other type which
bodily lift the car up, for after it is thus ‘lifted
up it is frequently desirableto forcethe chassis
and it is here .where our bracket jack‘ has par
The frame of our jack maybe rigid, but is
are preferably Z.-irons or their equivalent, riv
eted or welded to the side bars, and the. inner
ends of the inner frame section are spaced by
a bar 8,.whereas‘ the other ends of‘ the outer
frame are leftfree of any cross tie which might,
interfere with the positioning of the jack-screw.
to any place along the frame, but they are held
against spreading by means of a pair of clamps.
9, whichare formed of short angle‘ bars over
lapping the upper edges of ‘both frame sides and
grooves at ID to receive the upper edges of bars
5. These/clamp bars are held in place by bolts
Figure 6 is an elevation of a modi?ed form
for servicing, vand 2 represents the ends ofour' 15“
of bars 4 and which may be tightened up to
?rmly lock the frame sections at any point of
Our jack is provided witha specialsupporting extension. so that‘it cannot accidentally be re-‘
bracket which‘is‘ adapted‘ to engage the hoist; tracted to fall off its end supports when in use,
‘It will be noted from Figure 3 that the inner
structure upon which the automobile has already
frame'section is spaced inward from the outer
been ‘raised, and along which‘ bracket" the split
nut‘ carriage of "our 1 jack vmay beu'adjusted to . frame sides by bolts 1 I,‘ and from Figure 2 also 55 4
ticular ‘value.
by spacing nuts 12 so that it rests on the lower
webs 4’ of the outer frame inward of the rounded
inner corners common to such angle bars.
The split nut carriage 6 is preferably made of
a short section of a channel iron resting upon
the horizontal webs 5’ of inner frame section
bars 5 and is held in sliding relation thereto by
a lower plate I 3 which is spaced below the chan
nel section 6 as by blocks l4 and bolts l5 so
10 that plate l3 freely overlaps the margins of
webs 5'v and comes close to the inner edges of
webs 4' to function as a guiding element for
the extended bracket frame absolutely rigid, the
frame and carriage are moved at right angles to
each other to bring the jack-screw directly under
the part to be lifted, the screw is simply shoved
upward to contact the part to be raised, then let
down slightly to close the nut about the jack
screw, and the crank lever 30 turned to apply the
To release the jack, the screw must ?rst
be unscrewed a short distance, the nut opened
manually and the screw pulled down, or entirely 10
through the nut if head I6 is removed.
There are some automobile service hoists which
sliding the carriage back and forth along the employ a couple of hoist cylinders without a
connecting frame, or “drive-on” frame as illus
The jack-screw is provided at its upper end trated by the beams I of Figure l, but each hoist
with a loose head or pressure contact member
cylinder has its own bracket or fork arms to en
gage under the axle of the car. For such hoists
resting on a large hardened ball I‘! revolvably . our bracket may be of modi?ed form as indicated
seated in a retaining socket formed in the end
in Figure 6 wherein the horizontal portion of the
of the screw. The head l6 may be freely lifted
bracket is shown at 32 with a split-nut carriage 20
[6 which takes the form of an inverted cup
off when not in use, and a standing pin I8 is
provided on the carriage 6 over which the head
may be placed, and the jack-screw withdrawn
from the split'nut and laid alongside the car
riage when the device ‘is, dismantled for ship
ping or carrying about.
The two sections of the split nut are horizon
tally pivoted at their remote ends at I 8', l8"
to the sides I9 of a small piece of channel iron
20secured to carriage channel plate 6 by bolts Id.
The form of the split nut halves is best shown
in Figure 5 wherein they will be seen to be formed
with a thread 2| for about the upper half only
and with an enlarged bore below tapered out
wardly at 22 to clear‘ the threaded jack-screw
3 when the nut sections are opened to the po
l3’ slidably supported on it as described for Figure
l, and with one end of the bracket formed with a
hookportion' 33 formed to engage the upper end
of the hoist cylinder or column 34 or the axle
bracket 35, and the outer end of the bracket 32
is angularly braced'as by a pair of braces 36
which, at their lower ends engage opposite sides
of the cylinder 34 and are tied by a cross bar 37
which rests against the cylinder.
In this modi?ed form the jack-screw 3’ is pref
erably provided with'a vise handle 38 to better
clear the braces 36 when operating close to them.
Having thus described our invention and the
manner of its use, what we claim is:
1. In a jack of the character described, a
bracket comprising a ?rst pair of spaced angle
sition shown in Figure 4 to the limit of their
bars provided with means at one end tying the
rear stop shoulders 23.
bars together and forming an outwardly directed
flange, a second pair of spaced angle bars slid
Also to be observed is that each nut half is
40 formed with a lower semicircular flange 24 which
falls snugly within a circular opening 25 bored
through the bottom of the carriage, when the
nut is closed, to thus relieve the pivot bolts l8,
l8’ from spreading tendency of the nut halves.
The jack-screw 3 is guided centrally with respect
to the nut halves by a loose round bore l3’ in
lower plate l3.
The nut halves each have a small projecting
?nger or lug 26 at one lower corner, and a cor
50 responding recess 21 at the other, and are rights
and lefts in this respect so that the lug of one
will engage the recess of the other and compel
both to work together in opening and closing.
Also to be noted is a standing ?ange 28 on each
55 half with a lug 29 for gripping with the ?nger to
open the nut halves, or striking with a tool.
It should be observed that the pivot points
are well below the threaded portions of the nut
so ‘that the downward force of ‘the jack-screw
tends to hold the nut halves ?rmly closed while
the screw is under pressure of work, as any open
ing ‘of the nut halves will tend ?rst to lift the
jack-screw bodily a short distance before the
halves can open.
65 . At the lower‘end of the screw is a suitable lever
handle 33 preferably provided with operating
cranks 3| at one or both ends.
It may be noted that by reason of the particu
lar construction of our split nut as described, it
70 operates perfectly with a common threaded jack
screw without tendency to separate.
In operation of our improved jack the bracket
ably sup-ported within the ?rst pair in projecting 40
at the outer ends of the second pair of angle bars
tying them together and forming an outwardly
directed ?ange, means for locking both pairs of
relation to the untied ends of the ?rst pair, means
angle bars at various degreesof extension, a car
riage slidably supported on the second pair of 45.
angle irons, and a jack screw extending through
said carriage operating in a split nut supported
2. In a jack of. the character described, a ver
tically arranged threaded jack screw, a split nut 50
engaging the screw, said split nut comprising two
nut-halves parted along a vertical line, a base
plate upon which the nut-halves are supported
when closed, and horizontally. extending pivots
pivoting the nut-halves to said plate for opening
and closing.
3. In a jack of the character described, a ver
tically arranged threaded jack screw, a split nut
engaging the screw, said split nut comprising two
nut-halves parted along a vertical line, a base
plate upon which the nut-halves are supported
when closed, and horizontally extending pivots
pivoting the nut-halves to said plate for opening
and closing, each nut-half provided with an
aligning shoulder centered in an opening in said 65
plate when the halves are closed and preventing
the nut-halves from spreading.
4. In a jack of the character described, a ver
is extended to the required length to straddle the
tically arranged threaded jack screw, a split nut
engaging the screw, said split nut comprising two
nut-halves parted along a vertical line, a base
plate upon which the nut-halves are supported
space over the pit or between the hoist beams l,v
tightened with bolts l I so as to hold
pivoting the nut-halves to said plate for opening
75.. clamps 9 are
when closed, and ‘horizontally extending pivots
and closing, and means positively connecting the
nut-halves together for simultaneous opening and
screw and spaced outwardly therefrom and also
spaced below the threading of the nut-halves
> so as to require an upward swinging of the nut
tically arranged threaded jack screw, a split nut
halves in opening them from the screw whereby
they are automatically held closed when the 5
engaging the screw,'said split nut comprising two
screw is under pressure.
5. In a jack of the character described, a ver
nut-halves parted along a vertical line, a base
plate upon which the nut-halves are supported
when closed, and horizontally extending pivots
pivoting the nut-halves to said plate for opening
and closing, the pivots of the nut-halves being
positioned respectively at opposite sides of said
6. In the construction as speci?ed in claim 5,
a lug formed on each nut-half arranged for strik
ing to open said halves.
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