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Патент USA US3056475

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Oct. 2, 1962
3,056,468
|_. F. JASEPH
VEHICLE LIFT SAFETY DEVICE
Filed May 8, 1961
FIG. 2
FIG. 3
FIG. I
)III
INVEN TOR.
LAWRENCE F. JASEPH
16.,
United States Patent Office
1
.‘i?dhli?d
Patented Get. 2, 1962
Z
A further object is to provide such a device that is
fully automatic in operation except for the manual look
3,056,468
VEHICLE LEFT SAFETY DEVICE
ing required before the vehicle lift is lowered.
Lawrence F. Jaseph, Memphis, Tenn, assignor to Dover
Corporation, Washington, D.C.
Filed May 8, 1961, Ser. No. 108,605
7 (Ilaims. (Cl. 187--8.49)
A further object is to provide such a device in which
is provided locking means comprising a tip provided on
one end of the latching element adapted to be positioned
behind an embossment to lock the latching element in
This invention relates to a safety device for vehicle lifts
place.
and the like to prevent the accidental lowering thereof.
The means by which the foregoing and other objects
This invention is particularly useful in a so-called “non 10 of the present invention are accomplished. and the manner
rotator” leg of the type which includes telescoping inner
of their accomplishment will be readily understood from
and outer members arranged so that the inner member
the following speci?cation upon reference to the accom
is attached to the load supporting structure of the vehicle
panying drawings, in which:
lift for vertical movement therewith and the outer mem
FIG. 1 is a schematic fragmentary view of a vehicle
ber is mounted in a ?xed position usually below the ?oor 15 lift incorporating the improved safety device of the pres
level. The safety device of the present invention is car
ent invention.
ried in the inner member of the non-rotator leg and ar
FIG. 2 is an enlarged fragmentary sectional view of
ranged so that the latching element thereof, when in a
the device taken as on the line II-—II of FIG. 5, but show
latching position, extends above the outer member to
ing the latching element in a locked position.
prevent the inner member and therefore the load sup
FIG. 3 is a view similar to FIG. 2 but showing the
porting structure from being accidentally lowered or acci
inner member lowered relative to the outer member and
dentally falling, since the latching element will engage
showing the latching element in an intermediate position.
the top of the outer member to prevent such movement.
FIG. 4 is a view similar to FIG. 2 but showing the
When it is desired to lower the supporting structure, the
latching element in a latching position.
latching element is movable into a resetting position, 25
FIG. 5 is a side elevational view, viewed as from the
where the latching element is positively locked until
line V—-V in FIG. 4.
lowered into the outer member.
FIG. 6 is a fragmentary sectional view taken as on
There have been other types of safety devices hereto
the line Vi—-VI of FIG. 4.
fore contemplated for preventing accidental lowering of
Referring now to the drawings in which the various
vehicle lifts. For example, one type of device operates
parts are indicated by numerals, the safety device 11 of
on a movement of the center of gravity of the latching
the present invention is shown in connection with a ?uid
element from one side of a dead center position to the
other side in moving from a latching position to a re
operated lift, which is indicated in general by the numeral
13 and which comprises the usual cylinder 15 ?rmly em
setting position. In this type, the latching element merely
bedded in a foundation 16, as concrete or the like, and
rests in the resetting position under the in?uence of 35 having a vertically movable piston 17 carrying a load or
gravity. There is no positive locking of the element in
the resetting position and it could be accidentally moved
into the latching position by a transverse force exerted
thereagainst. In contrast to this, the latching element
vehicle supporting structure 19. The ?uid system for
raising and lowering piston 17 is not shown since it forms
no part of the present invention and comprises any suit
able well-known means which utilizes a suitable ?uid
of the present invention is arranged so that the center of 40 such as the combination of hydraulic and air pressure,
gravity thereof is so related to its pivot axis that the latch
ing element has a tendency at all times to pivot in one
direction, and it is held in the resetting or locked position
against such pivoting movement by a positive means.
To unlock the latching element it is necessary for the
latching element to move upwa-rdiy so that there is little
likelihood that a transverse force would accidentally un
lock the latching element, but instead it is unlocked at the
proper time by engagement with the outer member which
causes the latching element to move upwardly. In other
or hydraulic ?uid alone.
Fixedly secured in the foundation 16, adjacent and
parallel to cylinder 15, is an outer member 21, preferably
formed from a pipe or tube smaller in diameter than
cylinder 15 and into which an elongated inner member
23, preferably formed from a- still smaller pipe or tube,
is telescoped. Inner member 23 is rigidly secured adjacent
the upper end thereof to vehicle supporting structure 19
and slides freely in the outer member as piston 17 is
raised and lowered. Thus, outer member 21 is mounted
below the path of movement of supporting structure 19
with the upper end of the outer member preferably being
words, the center of gravity of the latching element of
the present invention does not shift from one side of
the pivot axis to another but stays on the same side
even with the ground or ?oor level 25. The above de
scribed combination of inner member 23 and outer mem
55
to be only unlocked by engagement with the outer mem~
ber 21 is commonly known as a “non-rotator” for pre
thereof and is held against pivot by locking means adapted
ber upon lowering of the vehicle lift. The above men
tioned locking means of the present invention comprises
a tip provided on one end of the latching element adapted
to be positioned behind an embossment to lock the latch
ing element in place.
Thus, one of the objects of the present invention is to
provide an improved and e?icient safety device for ve
hicle lifts and the like.
A further object is to provide such a device that is
“positive acting” and completely reliable.
venting undesired rotation of supporting structure 19,
and is designated in general in the drawings by numeral
60
65
27. The safety device 11 of the present invention is
preferably incorporated in non-rotator 27 to cooperate
between members 21, 23, as will now be described.
Safety device 11 comprises in general a latching element
29 pivotally supported in inner member 23 by a horizontal
shaft 31 that extends through an elongated slot 33 pro
vided in the latching element. The opposite ends of shaft
31 are supported in inner member 23 as by means of
A further object is to provide such a device that is
spaced parallel vertical plates 35, 36 disposed on opposite
simple in construction and easy to operate.
sides of latching element 29 and which plates form part
A further object is to provide in such a device a latch
of a housing 37 that is preferably cast in one piece and
ing element that, because the latching element has a
includes
laterally spaced side members 39, 41 which prefer
tendency to pivot in one direction, is de?nite in its move 70 ably extend above and below vertical plates 35, 36 for a
ment from a locked position to an intermediate position
short distance and which are arcuately formed on the
and thence to a latching position.
outer faces thereof to conform to the cylindrical outer
3,056,468
4
3
surface of inner member 23 so that side members 39, 41
are ?ush with inner member 23 when the housing is
placed in the inner member, as hereinafter described. It
will be understood that side members 39, 41 interconnect
the vertical plates 35, 36 to establish the rigid housing.
In addition, it will be understood that to assemble housing
37 in inner member 23 it is only necessary to cut trans
verse openings 43, 45 in inner member 23 to conform to
the outline of housing 37. Then the housing 37 is slipped
into place in inner member 23 and welded therein to
?xedly mount the housing in the inner member. Vertical
1y elongated transverse openings 47, 49 are respectively
provided in side members 39, 41, which openings are in
substantially transverse alignment with the space 51 be
tween plates 35, 36 so that a transverse passage is provided
through inner member 23 in housing 37.
Latching element 29 is provided adjacent one end there
of with a tip 53 which is adapted to be positioned behind
an embossment 55 to releasably and positively hold the
latching element in a locked position, as shown in FIG. 2.
Embossment 55 is preferably located between vertical
plates 35, 36 at a place lower than shaft 31, and is prefer
ably supported on a horizontal plate 57, which is prefer
ably integrally cast with housing 37. Embossment 55 is
to pivot the latching element in said one direction without
departing from the spirit and scope of the present inven
tion. Bearing in mind the above described tendency of
latching element 29 to pivot in said one direction at all
times, the unlocking operation of tip 53 from behind
embossment 55 is better understood since it is apparent
that once the tip has been lifted upwardly by contact with
outer member 21, the tendency of the latching element
to pivot will cause tip 53 to move over apex 63 and com
plete the unlocking operation. Also, it will be understood
that surface 61 acts somewhat as a cam to aid the un
locking operation. In addition, it will be seen that al
though latching element 29 is ef?ciently and effectively
unlocked by engagement with upper end 59, any acci
dental unlocking by a horizontal force striking the end
portion 65 will not be likely since an upward force is
required.
As long as latching element 29‘ is down inside of outer
member 21, as shown in FIG. 3, the latching element will
remain in said intermediate position with the latching ele
ment in the area 69 thereof sliding on the inside of
outer member 21 when the inner member is moved, but
when the vehicle supporting structure 19 is‘subsequently
moved to a raised position so that area 69 is above outer
also preferably integrally formed with plate 57 during the
member 21, the area 69 will no longer have the inside of
casting of the housing and the plate. It will be noted that
outer member 21 to rest on and will therefore pivot
clockwise. Thus, as the upward movement of inner
embossment 55 is provided with an inclined forward sur
locked position the end portion 65 of the latching element
opposite from tip 53 extends outwardly beyond the ex
member 23 is continued, latching element 29 continues
to pivot clockwise until the lower edge 75 of the latch
ing element contacts the portion 77 of member 41 that
de?nes the lower end of opening 49 and serves to stop
the latching element in said latching position, shown in
terior of inner member 23 through transverse opening 47
FIG. 4.
face 59 which slopes upwardly and rearwardly from
plate 57 and joins an oppositely inclined rearward surface
61 at an apex 63.
When latching element 29 is in said
It will be understood that this movement from
said intermediate position to said latching position Will
above outer member 21 and the remainder of the latching
element is on the interior of inner member 23. It will be 35 take place since, as heretofore described, the latching ele
understood that said locked position can only occur when
inner member 23 is in positions sufficiently raised relative
to outer member 21 so that the end portion 65 can extend
ment 29 has a tendency to move in a clockwise direc
tion. It will be seen in FIG. 4 that when latching ele
ment 29 is in said latching position, portions of the latch~
ing element, i.e. portions at 79 and at 69, extend out
outwardly from the exterior surface of inner member 23.
It should be pointed out that said locked position is the 4:0 wardly in opposite directions respectively through trans
verse openings 47, 49 above outer member 21 to limit
position into which the latching element 29 is placed, in a
subsequent accidental downward movement of inner
manner later to be described, preparatory to lowering
member 23 and vehicle supporting structure 19 since any
vehicle supporting structure 19. When vehicle supporting
downward movement would be limited by engagement of
structure 19 is lowered with latching element 29 in said
portions 79 and 69 with upper end 67, with such a
locked position, it will be understood that end portion
65 will engage the upper end 67 of outer member 21 which 45 condition being illustrated in FIG. 1. It should be
noted that in the normally raised position of vehicle sup
will cause tip 53 to be lifted relative to embossment 55
to unlock the latching element 29, whereupon the latching
porting structure 19, latching element 29 is usually spaced
element will rotate clockwise as viewed in FIGS. 2 and 3
until the latching element moves through transverse open
above upper end 67, as shown in FIG. 4.
The exact shape of latching element 29 is not critical,
although the relationships of the center of gravity, pivot
points, etc. should be maintained. The shape shown in
the drawings, however, is the preferable shape since it has
been found to operate exceptionally well, and the lower
edge 75 is preferably straight and preferably horizontal
cated as at 69 has engaged the inner surface of outer mem
ber 21. It will be understood that the upward lifting of 55 when the latching element is in said latching position, as
ing 49 and into engagement
member 21, which stops the
termediate position shown in
this ?gure that the area of
with the interior of outer
latching element in an in
FIG. 3. It will be seen in
latching element 29 indi
tip 53, as above described, is possible since slot 33 is elon
gated in a direction generally extending towards tip 53
and away from portion 71, which is the portion of the
latching element de?ning the end of the slot 33 and upon
best seen in FIG. 4.
Thus, from the foregoing, it will be seen that latch
ing element 29 automatically moves from a locked posi
tion, to an intermediate position, and then to a latching
which the latching element normally pivots. It should 60 position. Therefore, there is no possibility that the op
erator of the vehicle lift will forget to move the latch
be pointed out that when end portion 65 engages upper
ing element into a latching position when the vehicle
end 67, the major portion of the latching element is in
supporting structure is subsequently raised after having
been lowered.
limit pivot of the latching element, as above described.
It will be understood that latching element 29 is easily
In addition, it should be pointed out that relationship of 65
and quickly returnable to the locked position when the
the center of gravity of latching element 29 to its hori
operator desires to subsequently lower vehicle support
zontal pivot axis about shaft 31 is such that the latching
ing structure 19. This is easily done by either kicking
element will pivot in one givn direction. In other words,
the latching element 29 or by moving it with other means
as viewed in FIGS. 2, 3 and 4, the center of gravity of
latching element 29 is to the right of shaft 31 so that the 70 such as with the hand or with an instrument to pivot the
latching element counterclockwise until tip 53 once again
latching element is urged at all times to pivot clockwise.
moves over apex 63 and behind embossment 55. It will
Although, in the safety device 11 shown in the drawings,
be understood that the slope of forward surface 59 will
the force of gravity is the means for pivoting the latching
side of outer member 21 so that the outer member will
facilitate this movement of tip 53 over ‘apex 63.
element in said one direction, it will be understood that
From the foregoing description it will be understood.
other means such as springs or the like may be employed 75
5
3,056,468
that an improved and e?icient safety device for vehicle
lifts and the like is provided. In addition, such a device
is provided which is “positive acting” and completely re
liable. In addition, such a device is provided which is
simple in construction and easy to operate.
Although the invention has been described and illus
trated with respect to a preferred embodiment thereof,
6
when in said locked position a portion of said latching ele
ment extending outwardly through one of said transverse
openings above said outer member whereby when said in
ner member is lowered into said outer member said latch
ing element potrion is engageable by said outer member,
said latching element being arranged so that when said
latching element portion is engaged by said outer mem
it is to be understood that it is not to be so limited since
ber a major portion of said latching element is inside of
changes and modi?cations may be made therein which
said Outer member, said locking means and said latching
are within the full intended scope of this invention as 10 element being arranged so that engagement of said latch
hereinafter claimed.
I claim:
1. In a vehicle lift having a vertically movable load
ing element portion by said outer member is effective to
urge said latching element portion upwardly and in coop
eration with the tendency of said latching element to piv
supporting structure and having telescoping inner and
ot is effective to unlock said latching element from said
outer members with said inner member being ?xed to 15 locking means whereby said latching element continues to
said load supporting structure and said outer member
pivot in said one direction until in said intermediate posi
being mounted below the path of movement of said
tion in which said latching element extends into one of
supporting structure, a safety device cooperating between
said transverse openings and slidably rests against the in
said members to prevent accidental lowering of the load
side
of said outer member, subsequent raising of said in
supporting structure comprising a latching element, said 20 ner member
so that said latching element no longer slid
inner member being provided with transverse openings;
ably rests on the inside of said outer member being effec
means pivotally supporting said latching element in said
tive to cause said latching element to pivot in said one di
inner member for pivot about a horizontal axis between
rection from said intermediate position towards said latch
locked,vintermediate and latching positions; said latching
element being arranged so that the force of gravity at all 25 ing position, means for limiting pivot of said latching ele
ment to stop said latching element in said latching position
times tends to urge said latching element to pivot in one
wherein
portions of said latching element extend outward
given direction, locking means cooperating between said
ly in opposite directions respectively through said trans
inner member and said latching element to releasably
verse openings above said outer member to limit subse—
and positively hold said latching element in a locked
position against the force of gravity tending to carry the 30 quent accidental downward movement of said inner mem
ber relative to said outer member
latching element in said one direction, when in said
3. In a safety device of the type incorporated in a vehi
locked position a portion of said latching element ex
cle lift non-rotator including inner and outer members and
tending outwardly through one of said transverse open
having a latching element pivotally supported in said inner
ings above said outer member whereby when said inner
member is lowered into said outer member said latch
ing element portion is engageable by said outer member,
said latching element being arranged so that when said
latching element portion is engaged by said outer mem
ber a major portion of said latching element is inside of
said outer member, said locking means and said latch
ing element being arranged so that engagement of said
member for movement in one given direction between re
setting, intermediate and latching positions; means for op
erating said latching element comprising locking means
cooperating with said latching element to releasably and
positively hold said latching element in said resetting posi
tion against movement in said one given direction, said
locking means being unlockable upon lowering of said
inner member into said outer member, and said latching
element having a tendency at all times to pivot in said one
given direction towards said intermediate and latching
latching element portion by said outer member is effective
to urge said latching element portion upwardly and in
cooperation with the tendency of pivot of said latching
positions whereby when unlocked said latching element
element is e?ective to unlock said latching element from
said locking means whereby the force of gravity causes 45 pivots in said one direction towards said intermediate and
said latching element to continue to pivot in said one
direction until in said intermediate position in which said
latching positions.
4. In a vehicle lift having a vertically movable load sup
latching element extends into one of said transverse
porting structure and having telescoping inner and outer
openings and slidably rests against the inside of said
outer member, subsequent raising of said inner member
members with said inner member being ?xed to said load
supporting structure and said outer member being mounted
below the path of movement of said supporting structure,
a safety device cooperating between said members to pre
vent accidental lowering of the load supporting structure
comprising a latching element including a tip adjacent one
55 end, said latching element being provided with an elon
so that said latching element no longer slidably rests on
the inside of said outer member being effective to cause
said latching element to pivot in said one direction from
said intermediate position towards said latching posi
tion, means for limiting pivot of said latching element to
stop said latching element in said latching position where
in portions of said latching element extend outwardly in
gated slot therethrough, said inner member being provided
with transverse openings; a shaft carried in said inner
openings above said outer member to limit subsequent
member and extending through said elongated slot to piv
otally support said latching element in said inner mem
accidental downward movement of said inner member
relative to said outer member.
termediate and latching positions; said latching element
opposite directions respectively through said transverse
2. In a pair of Vertically disposed telescoping members
including an inner member slidably mounted in an outer
member, a safety device cooperating between said mem
ber for pivot about a horizontal axis between locked, in
being arranged so that the force of gravity at all times tends
to urge said latching element to pivot in one given direc
tion, an embossment carried by said inner member for co—
bers to prevent accidental lowering of said inner member 65 operating with said tip to releasably and positively hold
said latching element in a locked position against the force
relative to said outer member comprising a latching ele—
ment, said inner member being provided with transverse
openings; means pivotally supporting said latching element
of gravity tending to carry the latching element in said
one direction, said embossment having an inclined forward
surface sloping upwardly and rearwardly and having an
tween locked, intermediate and latching positions; said 70 oppositely inclined rearward surface joining said forward
latching element having a tendency at all times to pivot
surface at an apex, when in said locked position said tip
in one given direction, locking means cooperating between
being positioned behind said embossment in contact with
said inner member and said latching element to releasably
said rearward surface, when in said locked position a por
and positively hold said latching element in a locked posi
tion of said latching element extending outwardly through
tion against the tendency to pivot in said one direction, 75 one of said transverse openings above said outer member
in said inner member for pivot about a horizontal axis be
3,056,468
8
whereby when said inner member is lowered into said outer
tion until in said intermediate position in which said
member said latching element portion is engageable by
said outer member, said latching element being arranged
so that when said latching element portion is engaged by
latching element extends into one of said transverse open
said outer member a major portion of said latching ele
ment is inside of said outer member, said embossment and
said latching element being arranged so that engagement
of said latching element portion by said outer member is
e?ective to urge said latching element portion upwardly
and in cooperation with the pivot tendency of said latch
ing element is effective to move said tip from behind said
embossment and unlock said latching element whereby the
ings and slidably rests against the inside of said outer
member, subsequent raising of said inner member so that
said latching element no longer slidably rests on the in
side of said outer member being effective to cause said
latching element to pivot in said one direction from said
intermediate position towards said latching position,
means for limiting pivot of said latching element to stop
said latching element in said latching position wherein
portions of said latching element extend outwardly in op
posite directions respectively through ‘said transverse
openings above said outer member to limit subsequent
force of gravity causes said latching element to continue
accidental downward movement of said inner member
to pivot in said one direction until in said intermediate
position in which said latching element extends into one of 15 relative to said outer member.
6. In a safety device of the type incorporated in a
said transverse openings and slidably rests against the in
vehicle
lift non-rotator including inner and outer mem
side of said outer member, subsequent raising of said inner
bers and having a latching element pivotally supported
member so that said latching element no longer slidably
in said inner member for movement ‘between resetting,
rests on the inside of said outer member being effective to
cause said latching element to pivot in said one direction 20 intermediate and latching positions; means for operating
said latching element comprising an embossment car
from said intermediate position towards said latching posi
ried by said inner member, said latching element having
tion, means for limiting pivot of said latching element to
a tendency at all ‘times to pivot in one given direction,
stop said latching element in said latching position where
said latching element being provided with a tip arranged
in portions of said latching element extend outwardly in
opposite directions respectively through said transverse 25 to be positioned behind said embossment to positively
lock said latching element in said resetting position
openings above said outer member to limit subsequent ac
against pivot in said one direction, said latching element
cidental downward movement of said inner member rela
being arranged to be moved upwardly relative to said
tive to said outer member.
5. In a vehicle lift having a vertically movable load
inner member when said inner member is lowered into
ly through one of said transverse ‘openings above‘ said ‘
movement of said latching element relative to said inner
member when said inner member is lowered into said out
er member, and said latching element having a tendency at
all times to pivot in said one given direction towards
supporting structure and having telescoping inner and 30 said outer member, upward movement of said latching
element in cooperation with the tendency of said latch
outer members with said inner member being ?xed to
ing element to pivot being effective to move said tip‘ from
said load supporting structure and said outer member be
behind said embossment and unlock said latching ele
ing mounted below the path of movement of said sup
ment.
porting structure, a safety device cooperating between
7. In a pair of vertically disposed telescoping members
said members to prevent accidental lowering of the load
including an inner member slidably mounted in an outer
supporting structure comprising a latching element in
member, a safety device cooperating between said mem
cluding a tip adjacent one end, said inner member being
bers to prevent accidental lowering of said inner member
provided with transverse openings; means pivotally sup
relative to said outer member comprising a latching ele
porting said latching element in said inner member for
ment; means movably and pivotally supporting said latch
pivot about a horizontal axis between locked, intermediate
ing element in said inner member for movement of said
and latching positions; said latching element having a
latching element upwardly relative to said inner member
tendency at all times to pivot in one given direction, an
and for pivot of said latching element about a horizontal
embossment carried by said inner member for cooperat
axis ‘between locked, intermediate and latching positions;
ing with said tip to releasably and positively hold said
means for operating said latching element comprising
latching element in a locked position against the force
locking means cooperating with said latching element
of gravity tending to carry the latching element in said
to releasably and positively hold said latching element
one direction, when in said locked position said tip be
in said locked position against pivot in one given direc
ing behind said embossment, when in said locked posi
tion, said locking means being unlockable upon upward
tion a portion of said latching element extending outward
outer member whereby when said inner member is low
ered into said outer member said latching element por
tion is engageable by said outer member, said latching
element being arranged so that when said latching ele
ment portion is engaged by said outer member a major
portion of said latching element is inside of said outer
member, said embossment and said latching element be
ing ‘arranged so that engagement of said latching ele
ment portion by said outer member is effective to urge
said latching element portion upwardly and in coopera
tion Iwith the pivoting tendency of said latching ele
said intermediate and latching positions whereby when
unlocked said latching element pivots in said one direc
tion towards said intermediate ‘and locking positions.
References Cited in the ?le of this patent
UNITED STATES PATENTS
ment is effective to move said tip ‘from behind said em
2,608,381
2,684,129
Pelouch ____________ .._ Aug. 26, 1952
Jaseph ______________ __ July 20, 1954
bossment and unlock ‘said latching element whereby said
latching element continues to pivot in said one direc
2,956,643
3,013,635
Halstead ____________ __ Oct. 18, 1960
Racely ______________ __ Dec. 19, 1961
t
2
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