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Патент USA US2408182

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Sept 24, 19467»-
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2,408,181 v
LIFTING MEcHANlsM;
FiiedJan. 22, 1942
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Patented Sept. `24, 11946
~ 2,408,181
UNITED ‘s'rATl-:s` ,PATE-_NT OFFICE
William L. Simonton, Dayton, Ohio, assigner to. ,y Y
The Joyce-Cridland Company, Dayton, Ohio, a
n
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corporation of ' Ohio
Application January 2z, 1942, serial No. 427,717
9 Claims.
l.
This invention relates ’to ïnf'ting lmeehamends,'
9 rigidly Ysecured thereto and has mounted with
in thesame abushing '_lß to form a bearing for
the ram.“ Asy here shown, this bushing is screw
threaded into the upper end of the body 6, as
shown at l l, and is provided with an annular pro
and more particularly to meansfor positively
locking the lifting element in an v.elevated load
supporting position. `In hydraulic lifts it has
been customary heretofore to retain the lifting.
A jection or' flange-I2 which overhangs the upper .
element, or ram, in an elevated position by clos
edges'of the body portion 6 and the sleeve 9. The
ing the cutoff valve to prevent the escape of oil d
mainlifting element or ram I3 is mounted in
or other iìuid from the cylinder, andinthe event
vthe bearing [.0 for vertical movement within the
of the escape of fluid from the cylinder, due to a
leaky valve or otherwise, the ram and the load 10 cylinder. ' It is of a diameter somewhat less than
thereon will move downwardly.
Y
the'int'ernal diameter of the cylinder and is pro
,Y
One object of the invention is to provide means
vided at its lower vend with an> enlargement I4
for positively retaining the ramv in its elevated
iìtting snugly within the body portion of the cyl
inder- and constituting in eifect a piston head.The ram'in the Vpresent instance is tubular in
position.
„
.
c
`
A further object of the inventionis to provide
-a positiveV lock for the _ram which willv automati
forni and is closed at its lower end by a bottom
wall l5. KïAtits upper end the ram has mounted
therein a bushing I6 having an internal thread
' cally lock the same against downward movement
immediately upon; a decrease inthe supporting
pressure.
'
to receive and adjustably support a supplemental]
'
A further object of the invention is toprovide
20 lifting element/Il'which is provided at its upper Y
end-With awork engagingmember I8 and is held
a locking device which Willbe in locking position ._
in adjusted positions by a locking nut I9.
The ram is provided in -its external surface with
at all times during the elevation of the rambut
will permit the ram to move upwardly with rela
tion thereto.` '
~
l
.
e a spiral" groove 2U which preferably extends for
A further object of the invention is to provide 25 substantially tneffull lengtn of the ram above the
such a locking device which may be moved to and
piston head IA’and forms on the rama spiral rib,
retained in a position near the upper end ofthe
which,” _in ¿the present instance, y is of _a Width e
. greaterthan the width of the groove. The ram
ram to permit the latter to movedownwar'dly.
is heldv against rotation >in the cylinder and for
Otherobjects of the invention may appear as Y
the mechanism is described in detail. ` In the accompanying drawing Fig. iis a verti
30
cal section taken centrally through a lifting
mechanism equipped -with my invention, partly
piston head |4'to the upper end of the ram. A
spline'22 rigidly mounted .Within the upper end
broken away, and showing the ram partly in ele-V
vation; Fig. 2 is aV section taken on the line 2-2
of Fig. 1; Fig. 3 is a vertical section taken cen
trally through the locking device; >and Fig. 4 -is
a detail view, partly in section, of another form
this‘purpose is,- >in tne'present instance, provided
with a vertical groove 2| ‘which extends from the
35
of thecylinder extends into the groove 2| and
thus" preventsuthe rotation of the ram without`V
interfering with its vertical movement. As here
shown,A thespline is seated in a groove in the bear
ing bushing I0 and is rigidly secured therein by
screws 23 extending through the sleeve 9, ,body
of retaining device.
.
«
.
In the drawing I have illustrated one embodi 40 portion jl!) and> bushing, and thus serving to rig
idly lock the ‘bushing Aagainst rotation as well as
ment of my invention and have shown the same
as applied to a hydraulic vehicle lift of a well
to support the spline in the groove 2 l. . Rotatably
known type which is designed primarily for use
with airplanes, and when used for that purpose
two orV more lifts, or jacks, are usually employed.
supported _on the cylinder is a locking device 24
It will be understood, however, that the invention
may take various forms and may be utilized in
connection with lifting mechanisms, orjaeks, of
having a‘ part extending into the spiral groove 20
of the ram and- havingjsliding engagement with
the lower wall` of that groove, so that as the ram
moves upward'lythe locking device will be caused
1 by gravity to follow downwardly along the groove
Á and to thus rotate about the ramV in contact with
,
e
n
As here shown, the lifting mechanism com k50 or close to the‘cylinder. When fluid escapes from
prises a »cylinder 5 which consists of a tubular> » the cylinder or the Asupporting pressurek on the
body portion 6 closed at its lower end by a cap
ram
otherwise relieved the upper wall of the
llke structure 'I rigidly secured thereto and pro-V
groove 20 will engage the locking device, in what
ever position it may then occupy, and the ram
v_lded with a fluid inlet 8. At its upper` end .the
various kinds.
body portion _6 is reinforced by an external sleeve
will'be thus locked'against downward movement. -
2,408,181
4
3
Preferably the locking device 24 comprises an
annular element extending about the ram and
the ram and maintaining the projection or rib
25 always in a locking position with relation to
normally supported on the flange l2 of the bush
ing IB, this ñange forming the top surface of the
the ram. When the ram has been elevated to the
desired height the usual cutoff valve is closed to
maintain a continuing support for the ram but
should there be any leakage of fluid from the
cylinderor shouldthe iiuid pressure be otherwise
decreasedt'the tendency of the ram to move down
these spiral ribs each extending for approximate
wardly under its load will cause the upper wall
ly one-half of a convolution, due to the relative 10 of .the spiral groove to engage the rib of the
ly narrow width of the annular member. The~ locking device and will create such frictional
contact between the upper wall of the groove and
lower edge of each rib 25 is chamfered so that-it
has free sliding contact with the lower wall of the
the rib and Abetweenthe locking device and the
groove 2i) as the ram is moved upwardly l-andthe"
upperjendof the i cylinder as to prevent the
cylinder.
This annular member is provided on
its inner surface with an inclined or spiral rib
25 which is parallel with and extends into the
spiral groove 20. There are preferably two of f
locking device will therefore follow-downfalongu- 15 rotation ,of .thejilocking device and thereby lock
the groove and will remain in contact with or
theram against downward movement, this lock
ing Operation;.takingqeiïect instantly upon the
close to the upper end of the cylinder. Whenthe
ram tends to move downwardly the upper surface
of the spiral groove will be brought into contact;l ï
with rib or ribs 25 and the .frictional contact be 20
tween the .rib> andthe >wall of thegroove-_and-be-'~ .Y
tweentheannular Ymernîber. _and the-¿upper/end of y
the .cylinder will prevent the rotation _of thelock
relief of the supporting pressure on the ram.
When the ram is to be lowered and While it is
supported by the ñuid within the cylinder the
locking-device or follower nut is run` upward on
the 1 yramÁ to a- position» spaced-from- the « upper»
end'of the'cylinder» a distance sufficient to per-~
mit the ram-to be lowered, and is retained -in that
ing. deviceand. it will therefore positively lock _.
the ram .against downward_movement._ To in» 25 position »by the retaining device 21 or 33. -1 v'Should
crease the ffrictional contact _ between- the locking
,
device
25 of the
and
locking
the ram,_the
.device isuppersurfaceof
chamfered andthe
therib
upf ..1
perwall of the~ groove-20 is chamfelîedas _s_hown,g_
at 26.. ÃïI‘heangularityof thechamfered.surfaces`
beingsuchas to provide a relatively..great.i1`ic_-¿_
tional contactbetween the` same. \¿
When the. ram is to be lowered the. locking. cle-__ »
vice ,24 is moved to a-positionnear. the .upper-.end_¿~ _
of the rain,` by manually _rotatingthesame _about _
theram, and is retained _in that positionto per-_v
mitthe ¿rain to be lowered. _Any suitable__means_
maybe .provided for> retaining thelocking device _- K
in a position -nearthe uppeijendof theramand. ,.
spaced _from the. upper .end_-of thecy1inder,.bi1t,z. 40
as shown. in Figs._1 to _3, a. diskll .is pivota11y.„.
mounted in a recess inthe :upperedgeof the ,an-_ _
nularmemher. '.29 .onen ecßentrícaxís by means..
of a. pivot nin 28,-s0 ,that the. dîslsfcanrol'mellv
be supportedoutlet Contact with the `.ramfrlßut may, Y
be moved about. .its-axis .11.1110 thespîral. groeve 29v
to support the locking device on the ram in spaced
relation _to the cylinder. -The disk, is of relatively
thin-,flat construction andwhen inserted in the '_
groove willso engage thewalls thereof as to pre
vent >the vlocking device moving downwardly by. 5,0
gravity,
Preferablyy a detent `is provided to re-_ .
tain the 'eccentricallylmounted diskin the posi
tion to which it has been movedand, as herel
shown, a'spring pressed ball .29 is mounted in a
recessßll'in the anular mem'ber 24 and the disk
21 is’pr'ovided lwith. spaced recesses 3| to receive
the detent and yieldabily resist the movement of `
the'li-ft‘be
or horizontal'pos/ition,
used, »merely‘as
in which
a jack,Y
the annular
in an inclined
mem-l
ber `or followerevnut -would not be retained» by Y'
gravity in ya position close to the cylinder," the
nutfmayof course be «moved» to »locking position>>-`
with relation to the cylinder-in any suitable man-A
ner, as by hand.
While I have shown and-described one Í»embodiment of my invention I wish it to be »un- ~
derstood -that I do not'desire to be limited to the'
details >thereofas various-'modifications may oc
cur toa'person skilled' in the art.y ~
Having now fully'ïdescribed ymy invention, what
I claim as new and desire to secure _by Letters
Patent is:`
Y
'
-1. A mechanism' comprisingy an upright tubu- ‘_
lar element, `>angelongateY yelement mounted for _
verticalmovement-in and `projecting beyond the '_
upper _end of said tubular velement _and having an ~
exterior ¿spiralv groove, and a locking memberv
extending ¿about the projecting'portion of said
elongategelement and vhaving va partextending
into said- spiral >groove to cause said locking mem
ber to rotate aboutsaìd elongate element under
the influence of gravity as said _elongate element
moves Aupwardlytwith- relation-to said _tubular ele
ment-and to be pressedV into> locking relation to
said tubular V'element by a downward force exe>
ertedv thereon by said elongate element._ _
„ 2. A mechanismcomprising an vupright tubu- ,
lar elementfan elongate’element mounted. for.
vertical movement-in and-projecting beyond :the
upperA end of said tubular element and having
an‘exterior spiral groove, and an annular mem
In Fig. Í4 there is shown a modified formof de
vice for retaining the follower. nut in its elevated 60 ber rotatable-aboutthe projecting portion of said A
elongatev element- and normally _held by gravita-y
position, this device comprising a set screw ex
the disk.
tending through the nutand adapted to engage
tionf'substan-tially
contact-l with an vupwardly
facìng'surface of said'tubular element, said- an
the ram. As here shown,»the set screw, 33, is
nular 4member -having apart extendingr into said>
mounted in the nut 24a in an inclined position
spiral
'-groove; to »slidably engage theV lower sur-H
65
and the-inner end of the nut may be caused
face thereof-_A and cause _said annular member to
either'to enter the groove in the ram or to en- .
gage the outer surface of the spiral rib', .
rotate
in Contact
about-said
with `said
elongatemernber
surface of said substantially
tubular ele-_W
ment as said elongate element moves'upwardlyVH
is admitted to the lower end of the cylinder the
ram will be forced upwardly but will beheld 70 and'to Jbe *"engagedrby the -upper surface of said»
groove-»and press said annulary memberinto ro- '
against rotation and the locking device; which
tationl
preventing engagement >with' -said~ tubular f' »
constitutes a follower nut, will move downward
It will _be apparent therefore that .when fluid
ly along the spiral groove *andI remain in con- ~
elementV when- said- elongate ¿element «tends -to '
tact with or close to the upperend of the »cyl-
movedownward; "
inder; thus permitting the Aupward movement-of
\- 3. InaY mechanismA com-prisingan-upright 'tu-á
2,408,181
6
felongate'element and held by gravity substan
bular Aelement and an elongate element; mounted
tially in contact with a ñxed part of said tubu
for.k longitudinal movement> in saidvtubular .ele
ment îand heldl against rotation, said elongate
lar element, said elongate element and said annu
element'having aspiral groove, an vannular mem
lar member having interengaging spiral parts to
ber extending-"about said _elongate element, sup
cause said annular member to rotate about said
ported Vnormally .by said tubular element land
elongate element in close proximity to said fixed
having aipart extending into said spiral groove,
partof said tubular element as said elongate
said part being adapted to engage the upper wall
element moves upwardly and to be moved into
of said groove and to be pressed into rotation
rotation preventing engagement with said ñxed
preventing engagement with said tubular element 10 part when said elongate element tends to move
downwardly.
when said elongate element tends to move down
wardly and tothus lock said elongate element
7. In a jack device of the class described, in
against such downward movement, and to slide
combination, a supporting member, a ram mem
along the lower wall of said groove and rotate
ber associated therewith for raising and lower
said annular element as said elongate element 15 ing movements vertically relative thereto, means
moves upwardly, said annular member tending
for preventing rotation of said ram member rela
to move by gravity toward said tubular element,
tive to said supporting member while permitting
said annular member being movable lengthwise
said raising and lowering movements of said ram
of said elongate element to a positionl spaced
member relative to said supporting member, a
from said tubular element to permit the down 20 lock member associated with said ram member for
rotation relative thereto about a substantially
ward movement of said elongate element, and a
device carried by said annular member and mov
vertical axis, said ram member and said lock
able into engagement with said elongate element
to retain said annular member in said spaced
member having parts including cooperating heli
position.
,
4. In a mechanism comprising an upright tubu
lar element and an elongate element mounted
for longitudinal movement in said tubular ele
cal surfaces whose helix angle is such that, upon
25 raising movement of said ram member relative to
said supporting member, the weight of the lock
member will cause rotational movement of said
lock member downward by gravity relative to
ment and held against rotation, said elongate
the ram member until the lock-member engages
element having a spiral groove, an annular mem 30 the supporting member, said lock member being
ber extending about said elongate element, sup- ,
cooperable with said supporting member to pre
ported normally by said tubular element and
~ vent rotation of said lock member relative to said
having a part extending into said spiral groove,
supporting member upon such engagement,y
said part being adapted to engage the upper wall
whereby to prevent unauthorized lowering move
of said groove and to be pressed into rotation 35 ment of the ram member relative to the support
preventing engagement with said tubular element
ing member upon such engagement.
when said elongate element tends to move down
8. In a jack device of the class described, in
wardly and to thus lock said elongate element
combination, a supporting member, a rammem
against such downward movement, and yto slide
berassociated therewith for lifting and lower
along the lower wall of said groove and rotate' 40 ing movements relative thereto, a lock member
said annular member as said elongate element
associated with said ram member for rotation
moves upwardly, said annular member tending to
relative thereto about a substantially vertical
move by gravity- toward said tubular element,
axis, said ram member and said lock member
said annular member being movable lengthwise
having parts including cooperating helical sur
vof said elongate element to a position spaced 45 faces whose helix angle is such that, upon lift
from said tubular element and a substantially
ing movement of said ram member relative to
ñat element mounted on said annular member in
said supporting member, the weight of the lock
a plane intersecting said lelongate element and
member will cause rotational movement of said
movable into said groove to retain said annularY . lock member downward by gravity relative to
member in said spaced position. ~
50V the ram member until the look member engages
5. A lock for a mechanism of the type which
the supporting member, said lock member being '
includes an upright tubular element and an ele
cooperable with said supporting member and said
ment mounted in said tubular element for longi
ram member to prevent unauthorized lowering
tudinal movement with relation thereto and pro
movement of the ram member relative to the
jecting beyond the upper end thereof, said lock 55 support upon such engagement, and'means on
comprising a member supported normally by a _
one of said lock or ram members movable into
ñxed part of said tubular element and rotatable
and out of engagement with the helical sur
about the projecting portion of said movable ele
faces on the other member for preventing rela
ment, said rotatable member and said movable
tive rotation of said lock and ram members when
element having cooperating parts operable upon 60 said means is so engaged, whereby to maintain
the upward movement of said movable element
Vsaid lock member in a ñxed position respecting
to cause said rotatable member to rotate under
said ram member, regardless of lifting or lower
the influence of gravity in close proximity to
ing movements of the ram, when said means is
so-engaged.
said fixed part while said movable element moves
upwardly with relation thereto, and to press said 65 9. In a, jack4 device of the class described, in
rotatable member `into rotation preventing en
combination, a supporting member, a ram mem
gagement with said fixed part when said mov
ber associated. therewith for lifting and lower
able element tends to move downwardly, and
ing movements relative'thereto, a lock member
thereby prevent said downward movement.
associated with said ram member for rotation
6. A mechanism comprising an upright tubu 70 relative thereto about a substantially vertical
lar element, an elongate element mounted for
axis, said ram member and said lock member
longitudinal movement in and projecting beyondv
one end of said tubular element and held against
having parts including cooperating helical sur
faces whose helix angle is such that, upon lift
rotation therein, , >an annular member rotatably
ing movement of said ram member relative to
mounted about the projecting portion of said 75 said supporting member, the weight of the lock
291095181
7
member WillA cause ` rotational- movement of., said
look member downwardby gravity relative to the
ram member until the loekmembe'r engages the
supporting member,- said lockrmember being co
operable withv said supporting member and» said
ram member to prevent unauthorized lowering
movement of the ram member relative to the
8
supportxupon suchy engagement,- and Yanec‘cent'ric
member pivoted Onsaidlook member and mov
able into and out of. engagement with therhelical
surfaces on the ram member. for preventing> rela
tive rotation of said nut and> said ram member
when said eccentric member> is so engaged.
WILLIAM L; SIMONTON.
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