Adjusting device of a baby-walker

An adjusting device includes an upper and a lower ring element connected with each other by a pivotal device disposed therebetween, the pivotal device has two pairs of rods cross-pivotally engaged, the upper ring element has a plane portion which has a shoulder formed on an under side, the adjusting device includes a movable element engaged to one pair of rods of the pivotal device, a base engaged to the under side of the plane portion and an operation element pivotally engaged to the base. The movable element has a serrated portion defined in an under side and the base has an opening defined therein corresponding to the serrated portion of the movable element. The operation element has a vertical portion and a horizontal portion which is pivotally engaged to an under side of the base with a spring disposed therebetween and a distal end has a serrated portion defined therein to engage to the serrated portion of the movable element via the opening of the base the horizontal portion has an operation bar transversely and slidably engaged therethrough and a block is engaged to an upper surface of the operation bar and has a resilient element disposed between the vertical portion of the operation element and the block which contacts the under side of the plane portion such that the serrated portion of operation element is disengaged from the serrated portion of the movable element by pulling the operation bar outwardly from the vertical portion and then lifting the operation bar upwardly.

BACKGROUND OF THE INVENTION 
The present invention relates to an adjusting device of a baby-walker and, 
more particularly to an adjusting device which is operated by two actions 
with different directions. 
There are kinds of baby-walkers having an adjusting device which is 
designed to adjust a height of the baby-walker for babies of different 
heights so that they may practice how to walk, the adjusting device is 
operated by an action of pushing a rod or a button downwardly such that a 
secured status of the baby-walker is released and then a new height of the 
baby-walker can be set. 
However, it is very dangerous if a child or the baby pushes the rod or the 
button unintentionally to release the secured status of the baby-walker, 
and because there needs only one action to operate the adjusting device so 
there exists a high risk to depend on the baby not to push the rod or the 
button. 
The present invention intends to provide an adjusting device which is 
operated by pulling an operation bar outwardly first and then lifting the 
operation bar upwardly so as to prevent a baby in the baby-walker from 
operating the adjusting device unintentionally to release the secured 
status of the baby-walker so as to mitigate and/or obviate the 
above-mentioned problems. 
SUMMARY OF THE INVENTION 
The present invention provides an adjusting device which has a movable 
element engaged to a pair of rods of a pivotal device which pivotally 
connects an upper ring element to a lower ring element of the baby-walker, 
the movable element has a serrated portion defined in an under side 
thereof, a base fixedly engaged to an under side of the upper ring element 
for the movable element being slid thereon and having an opening defined 
therein corresponding to the serrated portion of the movable element and 
an operation element having a vertical portion and a horizontal portion 
which is pivotally engaged to an under side of the base by a spring 
disposed therebetween and having a serrated portion formed therein which 
is engaged to the serrated portion of the movable element via the opening 
of the base, the vertical portion has an operation bar slidably and 
transversely inserted therethrough, a block is fixedly engaged to an upper 
surface thereof and contacts the under side of the upper ring element, a 
resilient element is disposed between the vertical portion and the block 
such that the serrated portion of the operation element is disengaged from 
the serrated portion of the movable element by pulling the operation bar 
outwardly from the vertical portion and then lifting the operation bar 
upwardly. 
It is an object of the present invention to provide an adjusting device of 
a baby-walker, which is operated by two different actions with different 
directions. 
Other objects, advantages, and novel features of the invention will become 
more apparent from the following detailed description when taken in 
conjunction with the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring to the drawings and initially to FIGS. 1 through 3, an adjusting 
device for a baby-walker in accordance with the present invention 
generally includes a movable element 30, a base 40 and an operation 
element 50 disposed to an upper ring element 10 of the baby-walker. The 
baby-walker generally includes the upper ring element 10 which has a plane 
portion 104 extending horizontally and inwardly from a periphery thereof 
and a lower ring element 13 which has a plurality of wheels 15 rotatably 
engaged to an under side thereof, the upper and lower ring elements 10, 13 
are connected by a pivotal device connected therebetween which are 
controlled to set a height between the upper and lower ring elements 10, 
13 by an adjusting device disposed to an under side of the upper ring 
element 10. 
The pivotal device comprises a frame 11 which has a U-shaped configuration 
and a pair of rods 12, each rod 12 is pivotally engaged to a respective 
leg of the frame 11 to form a cross-pivotal engagement, the U-shaped frame 
11 has a transverse portion 111 received in the movable element 30 
abutting an under side of the plane portion 104 of the upper ring element 
10, and the distal ends of the two legs thereof are pivotally connected to 
the lower ring element 13, each of the rods 12 has two ends respectively 
connected to the upper and lower ring elements 10, 13. 
The movable element 30 has four vertical walls, each two opposite walls 
thereof has a recess 31 defined therein for receiving the transverse 
portion 111 of the first frame 11 therein and a serrated portion 33 is 
formed in an under side of the movable element 30, two separated 
protrusions 32 extend from the other two opposite vertical walls thereof 
for moving along two rails 102 extending downwardly from the under side of 
the plane portion 104. 
The base 40 is a substantially rectangular plate which has an opening 44 
defined therein corresponding to the serrated portion 33 of the movable 
element 30 and four tubular parts 41 are formed on each corner thereof and 
each tubular part 41 has a hole 42 extending vertically defined therein, 
the base 40 is securely engaged to the under side of the plane portion 104 
by threading a bolt 421 through the holes 42 and engaged to four threaded 
holes 105 defined in the under side of the plane portion 104 so as to 
maintain the movable element 30 and the transverse portion 111 received 
therein slidably disposed between the base 40 and the plane portion 104. A 
lug 43 extends downwardly from each two opposite sides of an under side of 
the base 40, each protrusion 43 has a hole 431 defined transversely 
therein. 
An L-shaped operation element 50 has a vertical and a horizontal portion 
51, 56, the horizontal portion 56 thereof has two side walls extending 
upwardly therefrom in each of which a hole 58 is defined for pivotal 
engagement to the base 40 by a pin 60 inserted through the holes 431 and 
58 such that the base 40 is partially disposed on the horizontal portion 
56, a distal end of the horizontal portion 56 has a serrated portion 57 
formed upwardly therefrom so as to engage to the serrated portion 33 of 
the movable element 30 via the opening 44. A pair of resilient elements 
591 are disposed on an upper side of the horizontal portion 56 between the 
vertical portion 51 and the pin 60 corresponding to the serrated portion 
57 and between the horizontal portion 56 of the operation element 50 and 
the under side of the base 40. An operation bar 53 has first and second 
ends and is slidably and transversely engaged through the vertical portion 
51 such that the first end thereof extends from the vertical portion 51 
and the second end thereof extends toward the movable element 30, a block 
54 is fixedly engaged to an upper surface of the second end of the 
operation bar 53 and a spring 55 is disposed between the block 54 and the 
vertical portion 51 such that when the operation bar 53 is pulled outward 
from the vertical portion 51, the spring 55 is compressed by the block 54 
and the vertical portion 51 and the block 54 is moved a distance. A 
transverse protrusion 52 extends transversely from the vertical portion 51 
such that the first end of the operation bar 53 is located beneath the 
transverse protrusion 52. The block 54 has an upper surface contacting a 
shoulder 103 formed in the under side of the plane portion 104 such that 
the vertical portion 51 cannot be lifted up when the operation bar 53 is 
not pulled out. 
Therefore, when adjusting a height of the baby-walker, a user pulls the 
first end of the operation bar 53 to move the block 54 from contacting the 
shoulder 103 and then lifts the operation bar 53 or the transverse 
protrusion 52 upwardly such that the serrated portion 57 of the operation 
element 50 is disengaged from the serrated portion 33 of the movable 
element 30 to release the secured status so as to adjust a new height of 
the upper and lower ring elements 10, 13. 
Accordingly, the adjusting device in accordance with the present invention 
is operated by two actions which have different directions so as to 
prevent babies from releasing the secured status of the baby-walker. 
Although the invention has been explained in relation to its preferred 
embodiment, it is to be understood that many other possible modifications 
and variations can be made without departing from the spirit and scope of 
the invention as hereinafter claimed.