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Патент USA US3054601

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Sept. 18, 1962
L. H. COHN
3,054,591
BABY JUMPER
'
Filed Aug. 8, 1960
2 Sheets-Sheet 1
2!
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32
20
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‘6
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INVENTOR
44
LAWRENCE H.6OHN
A 20
,0
By
‘
ATTORNEYS.
Sept. 18, 1962
|_, |-|_ CQHN
3,054,591
BABY JUMPER
Filed Aug. 8, 1960
2 Sheets-Sheet 2
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44
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INVENTOR
LAWRENCE H. COHN
BY co’lvw. Q0446
ATTORNEYS.
United States atent
i.
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fine
Patented Sept. 18, 1%62
1
2
3,054,591
BABY JUMPER
Lawrence H. Cohn, University City, Mo., assignor to
Welsh Company, St. Louis, Mo., a corporation of
following detailed description of a preferred embodi
ment, particularly when considered in connection with
the accompanying drawings, in which:
FIG. 1 is a perspective view of the baby jumper;
Missouri
Filed Aug. 8, 1960, Ser. No. 48,318
10 Claims. (Cl. 248-399)
FIG. 2 is a front elevational view;
FIG. 3 is a side elevational view as seen from the left
of FIG. 2;
FIG. 4 is a schematic view illustrating a force vector
This invention relates generally to improvements in a
diagram based on the arrangement of FIG. 3;
baby jumper, and more particularly to an improved 10
FIG. 5 is an enlarged, fragmentary side elevational
mechanism for resiliently supporting the jumper in an
view of the spring connection shown in FIG. 3;
erected position, yet enabling collapse or folding of the
item when desired.
An important object is to provide a baby jumper that
includes a seat supported above the ground by a frame 15
capable of being moved from a folded to an erected po
sition, the frame including support elements operatively
interconnected by a resilient spring means that tends
to maintain the jumper in an erected position yet per
mits controlled oscillating movement of the seat in an
up and down direction under stressing of the spring
means upon jumping or bouncing action of the child
seated in the jumper.
'
Another important object is achieved by the provision
FIG. 6 is a side elevational view similar to that illus
trated in FIG. 3, but showing the seat in an adjusted
lower-heighth position;
FIG. 7 is a force vector diagram based on the arrange
ment shown in FIG. 6, and
FIG. 8 is a side elevational view of the baby jumper
in a folded position.
Referring now by characters of reference to the draw
ings, it is seen that the baby jumper frame includes a
plurality of support elements. One of the support ele
ments is a U-shaped horizontal base frame 10 adapted
to rest on a supporting subjacent surface such as a ?oor.
As is best illustrated in FIG. 1, the base frame 10 in
cludes parallel spaced side frame members 11 intercon
nected at the front by a web portion 12.
ing a seat above the ground, a spring means having one
Located above the base frame 10 is a horizontal
end connected to one of the support elements, and means
U-shaped seat support frame 13. As is best seen in FIG.
attached to an adjoining support element for adjustably
1, the seat support frame 13 includes spaced parallel
locating and retaining the other end of the spring means
side members 14 interconnected at the front by a web
incident to folding or erecting the jumper.
member 15.
‘Other important advantages are afforded by a stop
The base frame 10 and seat support frame 13 are in
means adapted to retain or ?x the adjustable spring end
terconnected at each side of the jumper by a pair of
upon erection of the jumper so as to realize the spring
braces 16 and 17. More particularly, each front brace
ing movement of the frame actuated by the bouncing of 35 16 has one end pivotally connected by pivot pin 20 to
the seated child.
its associated side member 11 of base frame 10, while
Another important object is achieved by providing
the other end of each brace 16 is pivotally connected
means for adjustably locating and ?xing the spring means
by pin 21 to its associated side member 14 of the seat
so that the jumper frame can be selectively erected to
support frame 13. Braces 17 are spaced rearwardly
diiferent heights to accommodate children of different
from braces>16 and are maintained in substantially paral
sizes. In order for a child to take best advantage of the
lel relation. One end of each rear‘brace 17 is pivotally
jumper, the heighth of the seat must be adjusted so that
attached by pivot pin 22 to its associated side member
the child’s feet can touch the ground. This condition
11 of the base frame 10, while the opposite end of brace
of a frame including four support elements pivoted to
gether to complete a quadrangle for collapsibly support
enables therchild to jump more easily and thereby enjoy
17 is pivotally attached by pivot pin 23 to the associ
the full play value of the item for which it was designed. 45 ated side member 14 of the seat support frame 13.
' Still another important objective is provided bymeans
That portion of the base frame 10 located between
that ?x the angular disposition of the spring means rela
pivot pins 26 and 22, and that portion of the seat sup
tive to the support element to which one spring end is
port frame 13 located between the pivot pins 21 and 23,
connected so that a lesser effective force is exerted perpen
together with the braces 16 and 17 at each side of the
50
dicular to the support element when the jumper is in a
jumper, afford a quadrangle. This mechanism serves to
relatively lower erected position than when‘ maintained
hold and maintain the seat support frame 13 in parallel
in a relatively higher erected position, thereby enabling
relation to the base frame 10 and hence parallel to the
a smaller child to more easily cause resilient springing
?oor, at all times and in all adjusted heighth positions.
action of the pivoted frame by bouncing in the seat.
Yet another important object is to afford an improved 55 The seat support frame 13 is parallel to the base frame
it} when in a folded position as is best seen in FIG.
mechanism mounting the spring means between the ad
8, is parallel when fully erected as is seen in FIG. ‘1,
joining support elements of the frame for selectively
and is maintained in parallel relation in all adjusted po~
maintaining the jumper in erected‘ position or selectively
sitions in between while being erected or folded as sug
permitting the jumper to be folded as mentioned previ
ously.
'
An important object is achieved by the provision of a
gested by FIG. 6.
‘
A U-shaped wire frame 24 is pivoted to the rear of
the seat support frame 13 just forward of the pivot pins
plate having an elongate slot within which a rod is slid
23 forming the attachment for rear braces 17.‘ A fabric
ably received, the rod being attached to one end of the
seat having a back portion 25 formed as a pocket is
‘spring and being movable against a stop shoulder on
'
the plate adjacent the slot incident to erection of the 65 slipped over the back frame 24.
The side panels ‘26 of the fabric seat are folded and
jumper frame so as to provide a spring anchorage.
Another important object is to provide a baby jumper
snapped over the side members 14 of the seat support
.frame 13, while the forward portion of the seat is sup
that is simple and durable in construction, economical
to manufacture and assemble, efficient in operation, and
ported by a fabric strip 27 snapped on to a cross rod
70 (not shown) extending between the two rearwardly pro
‘which can be quickly and easily erected or folded.
The foregoing and numerous other objects and advan
jecting side members 14. This cross rod may also sup
tages of the invention will more clearly appear from the
port beads 30 and the rear portion of a tray 31, the
3,054,591
3
tray being supported at its forward edge by the web
member 15 of the seat support frame 13.
4
raise the seat back to its fully erected position. Thus
it is seen that the child by his own actions while seated
The mechanism which maintains the baby jumper in its
erect position, which provides resiliency to the jumper,
and which permits quick and easy erection and collapse
in the jumper can cause the seat to move resiliently in an
up and down direction to a limited extent, all of which
of the item is shown in FIGS. 1-3 but is shown in greater
detail in FIG. 5.
Attached to the inside of base frame 10 at each side
years.
For reasons which will appear later, FIG. 4 shows a
of the jumper, is a plate 32. Speci?cally, the plate 32
overlaps pivot pin 20 and serves to engage the front
brace 16 as the brace 16 is raised and lowered. The
engagement of plate 32 with front brace 16 increases the
rigidity and strength of the jumper frame by precluding
lateral sway.
Formed in plate 32 is an elongate slot 33 that extends
generally in a fore and aft direction.
As is best seen
action and movement greatly pleases a child of tender
vector diagram of the forces exerted by springs 42 on the
front braces 16. Symbol A represents the force exerted
by each spring 42 in the direction of such spring. The
vector component perpendicular to the brace 16 is illus
trated by symbol B. The magnitude of vector B is the
cosine of the angle between vectors A and B. The force
represented by vector B is the effective force operating
to move the ‘brace 16 in a counterclockwise direction,
and hence operating to lift or raise the jumper frame to
its erected position. It will be understood that this
in FIG. 5, the slot 33 is inclined slightly downwardly
vector diagram represents the condition existing when
from its rearmost limit to its foremost limit. A plurality
rod 44 is located in the rearmost notches 34 as is illus
of offset notches 34, 35 and 36 are formed in spaced
relation along slot 33. These notches are best illus 20 trated in FIG. 3.
In order for the child to obtain the maximum amount
tarted in FIG. 5. While the embodiment disclosed and
of enjoyment from the jumper, it is desirable that the
presently described shows a total of three notches 34-—36,
child’s feet touch the floor. Obviously, when the child’s
it will be understood that the jumper can be advan
feet touch the floor it is easier for the child to bounce
tageously utilized with only a single notch and that addi
tional advantages and functional results can be obtained 25 or jump while seated.
The fully erected position of the jumper as is illustrated
by utilizing two or more such notches, all as will be
in FIG. 3 accommodates the larger child for which this
explained subsequently. The forward edges of the notches
jumper is designed. A smaller child when seated in the
34-36 de?ne stop shoulders 37, 40 and 41 respectively.
jumper while fully erected would be at a disadvantage
At each side of the jumper is a coil spring 42, the coil
because the child’s feet would not touch the floor. There
spring 42 having one end attached to front brace 16 by
fore, it is desirable that the seat of the jumper be lowered
pin 43 and having the opposite end attached to a rod 44.
slightly'or su?iciently so that the smaller child’s feet can
The rod 44 extends transversely of the baby jumper
touch the floor while the child is seated.
frame, the outer ends of such rod 44 being received in
In lowering or adjusting the heighth position of the
slots 33 formed in the laterally spaced plates 32. The
size of rod 44 is such that it'can slidably move along 35 seat to accommodate the smaller child, the rod is moved
along slots 33 until it comes opposite either of the other
slots 33 and move selectively into any one of the offset
notches 35 or 36. Assuming that the rod 44 is moved
notches 34-36.
into the intermediate notches 35, the braces 16 and 17
It is thought that the operation and functional advan
will be inclined forwardly to a greater degree as is shown
tages of the baby jumper has become fully apparent from
the foregoing detailed description of parts, but for com 40 in FIG. 6 than such braces are inclined when fully erected
as shown in FIG. 3. Consequently, the seat support frame
pleteness of disclosure, the erection and folding of the
13 is brought closer to the base frame 10 and the seat
jumper to various heights positions will be brie?y set
is located in a lower heighth position. Of course, if
forth.
necessary, depending upon the size of the child utilizing
It will be assumed that the baby jumper is in a com
pletely collapsed condition as is illustrated in FIG. 8. 45 the jumper the seat can be brought to a still lower heighth
position by moving the rod 44 into the forwardmost
In this position, the braces 16 and 17 are folded forwardly
notches 36.
so that the seat support frame 13 is located closely ad
Because the smaller child is usually lighter in weight, it
jacent the base frame 10. Moreover, the wire frame
is desirable that a lesser spring force be exerted opera?
24 of the seat back rest is folded forwardly so as to lie
tively on the braces 16 so that such smaller child can easily
substantially ?at over the seat support frame 13. The
move the seat up and down as a result of a bouncing ac
rod 44 is moved to its forwardmost position in plate
tion. This result is obtained by the particular arrange
slots 33. It is preferred that rod 44 be operatively dis
ment and connection of the springs 42 with the plates 32
engaged from the plates 32, yet held thereby, so that the
and front braces 16.
springs 42 are unstressed.
As is illustrated in the vector diagram of FIG. 7, which
In order to erect the baby jumper fully, the seat sup
represents
the condition existing when the frame compo
port frame 13'is gripped and moved upwardly and rear
nents of the jumper are in the adjusted heighth position
wardly as permitted by the pivoted lbraces 16 and 17. .
shown in FIG. 6, the vector A’ assumes the direction of
Upon erection, the rod 44 moves rearwardly in the plate
spring 42 and if of the same magnitude as the force vector
slots 33 until it is aligned with the rearmost notches 34.
The operator moves the rod 44 into the notches 34 so 60 A in FIG. 4. Again, the vector B’ is perpendicular to the
front brace 16 and the magnitude of such vector B’ is the
that the rod operatively engages the stop abutments 37
effective lifting force on the frame tending to hold the seat
partially de?ning the notches 34. The seat support frame
in the adjusted erected position of FIG. 6. The magni
13 is maintained in a horizontal position parallel to the
tude of vector 3' is the cosine of the angle between vector
base frame 10 by the quadrangle aiforded by the support
elements as described previously. Then, the U-shaped 65 A’ and B’. Because of the fact that brace 16 is inclined
forwardly to a greater degree and spring 42 is inclined
wire frame 24 is raised, and the item is conditioned to
more horizontally than the relative position of such ele
receive a child.
ments as shown in FIG. 3, the magnitude of vector B’ is
The springs 42 tend to urge the braces 16 and 17 in a
less than the magnitude of force vector B.
counterclockwise direction as viewed’ in FIG. 3, and hence
A comparison of these vector diagrams FIGS. 4 and
tends to urge the frame to a fully erected position as
shown. A child seated in the jumper can bounce or
jump while playing. Such action causes the seat to move
downwardly against the loading of springs 42. After the
seat has moved downwardly to a limited extent under the
7 lead to the conclusion that a lesser effective force is
exerted on braces 16 by the springs 42 when the seat is
in the lower adjusted position of FIG. 6 than is exerted
when the seat is fully erected as shown in FIG. 3. This
resilient action of springs 42, the springs 42 then act to 75 condition means that it is easier to actuate the seat in an
3,054,591
up and down direction when the seat is in the lower ad
justed heighth position of FIG. 6 than is possible when
fully erected.
Of course, for the reasons discussed pre
viously, this is highly advantageous because of the fact
that the child utilizing the jumper in the lower adjusted
heighth position is of a lesser weight than the child utiliz
ing the jumper in a fully erected position.
6
other end of said spring, said stop shoulder retaining the
last said spring end when the spring is stressed to main
tain the jumper in erected position.
4. In a collapsible baby jumper, a frame comprising
four support elements, means pivotally joining said sup
port elements together to form a quadrangle for col
lapsibly supporting a seat above the ground, at least one
To accommodate children of still smaller size the rod
spring connected at one end to one of said support ele
44 can be conveniently relocated in the forwardmost
ments, a plate attached to an adjoining element, the plate
notches 36 to engage stop shoulders 41. The seat will be 10 being provided with an elongate slot extending generally
lowered still further and the effective lifting force exerted
in a fore and aft direction toward and away from the
on braces 16 by springs 42 will be even less than that mag
support element to which the spring is connected, the
nitude indicated by vector B’ in FIG. 7.
plate including a plurality of stop shoulders spaced along
In order to collapse the jumper frame fully, the rod 44
said slot, and a rod slidably received in said slot and
is removed from the notches in which it is located and 15 selectively movable against any one of said stop shoulders
moved forwardly in plate slots 33 to the forwardmost po
upon erection of said support elements, the other end of
sition illustrated in FIG. 8. The seat support frame 13 is
said spring being connected to said rod, each said stop
consequently moved to a position closely adjacent the
shoulder retaining the rod when the spring is stressed to
base frame 10 as permitted by the pivotal action of braces
maintain the jumper in an erected position, one of said
16 and 17.
stop shoulders retaining the rod to maintain the jumper
Although the invention has been described by making
in a relatively lower erected position than another said
detailed reference to a single preferred embodiment, such
detail is to be understood in an instructive, rather than in
any restrictive sense, many variants being possible within
the scope of the claims hereunto appended.
25
I claim as my invention:
1. In a collapsible baby jumper, a frame comprising
four support elements, means pivotally joining said sup
port elements together to form a quadrangle for collapsibly
stop shoulder, when the rod engages one stop shoulder
to maintain the jumper in the said relatively lower erected
position the spring is angularly related to the support ele
ment to which the spring end is connected so that a lesser
force is exerted perpendicular to the last said support ele
ment than is exerted when the rod engages another stop
shoulder to maintain the jumper in a relatively higher
erected position in which the angular relation of the spring
supporting a seat above the ground, at least one spring
and the same support element is different.
connected at one end to one of said support elements, a
5. In a collapsible baby jumper, a generally horizontal
base frame, a seat support above the base frame, at least
plate attached to an adjoining support element, the plate
being provided with an elongate slot extending in a fore
and aft direction toward and away from the support ele
ment to which the spring is connected, the slot including
an offset notch de?ning a stop shoulder on said plate, a
rod slidably received and guided in said slot and selec
tively movable against said stop shoulder upon erection
of said support elements, the other end of said spring be
ing connected to said rod, said stop shoulder retaining the
rod when the spring is stressed to maintain the jumper in
erect position, the rod being selectively disengageable
from said stop shoulder and movable along said slot to
permit collapse of said support elements.
2. In a collapsible baby jumper, a frame comprising
four support elements, means pivotally joining said sup
port elements together to form a quadrangle for collapsi
bly supporting a seat above the ground, at least one spring
one brace pivoted to the base frame and to the seat sup
port, a plate attached to said base frame, the plate being
provided with a slot extending generally in a fore and aft
direction toward and from the said brace and an o?set
notch, a rod slidably received in said slot, and a spring
connected at one end to said brace and connected to the
other end to said rod, said rod being movable along and
guided by said slot selectively into said notch for reten
tion when said spring is stressed to maintain said jumper
in an erected position.
6. The combination and arrangement of elements as
recited above in claim 5, but further characterized in that
said slot includes a plurality of offset notches, each notch
de?ning a stop shoulder on said plate, and the rod being
slidably received in said slot and selectively movable into
any one of said notches to engage a stop shoulder upon
connected at one end to one of said support elements, a
erection, said stop shoulders acting through said spring to
plate attached to an adjoining support element, the plate
being provided with an elongate slot extending generally
hold its associated brace in different inclined positions
and thereby hold the jumper in a plurality of erected
in a fore and aft direction toward and from the support
height positions.
element to which the spring is connected, the slot includ
ing a plurality of offset notches, each notch de?ning a stop
shoulder on said plates, and a rod slidably received and
guided in said slot and selectively movable into any one
of said notches to engage a stop shoulder, the other end
of said spring being connected to said rod, each said step
shoulder retaining the rod when the spring is stressed to
maintain the jumper in one of a plurality of erected height 60
7. The combination and arrangement of elements as
recited above in claim 6, but further characterized in that
one of said stop shoulders retains the rod to maintain the
jumper in a relatively lower erected position than another
said stop shoulder, and when the rod engages one stop
shoulder to maintain the jumper in the said relatively
positions.
lesser force is exerted perpendicular to the said brace
than is exerted when the rod engages another stop shoul
der to maintain the jumper in a relatively higher erected
3. In a collapsible baby jumper, a frame comprising
four support elements, means pivotally joining said sup
port elements together to form a quadrangle for collapsi
bly supporting a seat above the ground, at least one spring
lower erected position the spring is angularly related to
the brace to which the spring end is connected so that a
connected at one end to one of said support elements, a
position in which the angular relation of the spring and
the said brace is different.
8. A collapsible baby jumper comprising a generally
plate attached to an adjoining support element, one of said
horizontal base frame, a seat support above the base
support elements laterally engaging the plate upon rela
frame, frame means interconnecting each side of said
tive pivotal movement to increase the rigidity of said
seat support to said base frame, each frame means in
frame when erected, the plate being provided with a slot 70 cluding a pair of braces pivoted to said seat support and
extending toward and from the support element to which
to said base frame to complete a quadrangle, a plate at
the spring is connected, a stop shoulder on said plate ad
tached to said base frame, the plate being provided with
jacent said slot, and means slidably received and guided in
a slot extending in a fore and aft direction, and a stop
said slot and movable against said stop member upon erec
shoulder on said plate adjacent said slot, a rod extending
tion of said element, said means being connected to the
transversely between said plates and having ends slidably
3,054,591
received in said slots, and at least one spring having one
end connected to one of said braces and having the other
end connected to said rod, said rod being selectively mov
able against said stop shoulder for retention when the
spring is stressed to maintain said jumper in an erected
position, and said rod being movable in said slots to
enable erection or collapse of the braces, the slots guiding
jumper in a relatively lower erected position than another
stop shoulder, and when the rod engages one stop shoul
der on each plate to maintain the jumper in the said rela
tively lower erected position, the spring is angularly re?
lated to the brace to which the spring end is connected so
that a lesser force is exerted perpendicular to the last
said brace than is exerted when the rod engages another
stop shoulder on each plate upon maintaining the jumper
said rod to and from said stop shoulder.
in a relatively higher erected position in which the angu
9. The combination and arrangement of elements as
recited above in claim 8, but further characterized in that 10 lar relation of the spring and the same brace is different.
one of the braces engages the side of said plate at each
side of the jumper upon relative pivotal movement of the
brace and base frame so as to increase the rigidity of the
jumper in the erected position.
10. The combination and arrangement of elements as 15
recited above in claim 8, but further characterized in that
the slot in each plate includes a plurality of stop shoul
ders, the transverse rod being selectively movable against
any one of said stop shoulders upon erection of said
jumper, said stop shoulders retaining the rod when the 20
spring is stressed to maintain said jumper in a plurality
of erected positions of ditferent heights, one of said stop
shoulders retains the transverse rod so as to maintain the
References Cited in the ?le of this patent
UNITED STATES PATENTS
367,020‘
1,580,508
1,667,362
Barlow ______________ __ July 26, 1887'
Liles ________________ __ Apr. 13, 1926
Van der Vliet ________ __ Apr. 24, 1928
2,149,945
Le Grand ____ __'_ ______ __ Mar. 7, 1939
2,299,928
2,927,628
Potter ______________ __ Oct. 27, 1942
Gill _________________ __ Mar. 8, 1960
525,989
Great Britain _________ __ Sept. 9, 1940
FOREIGN PATENTS
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