FIELD OF THE INVENTION
The present invention relates to an adjustable bicycle stem that allows the riders of a bicycle to adjust the stem to variable length. More particularly, the present invention relates to an adjustable bicycle stem that helps the riders in a growth age to adjust the posture and reach in the bicycle.
BACKGROUND OF THE INVENTION
A bicycle or bike is a small, human powered land vehicle which is an important way to travel in different parts of the world. It is one of the most important resources of travelling used by the people of every generation. All age group people have their some basic requirements while riding the bicycle. Therefore to suit the physical attribute of human bodies, different sizes of handlebar stems are manufactured accordingly. Previously, bicycles are manufactured with the stem holding the handlebar in a fixed position with respect to the frame which is not suitable for all types of riders. Maintaining the body position required with this type of bicycle may be uncomfortable during the course of a long ride. Also, they are disadvantageous in that they force bicycle rider to make choice of one stem to fit in all riding conditions such as uphill, downhill, urban area etc. Riders in the growing age had also problem in adjusting the posture and reach in the bicycle as they grow in size. It becomes difficult to use the bike for longer duration of time. So there is requirement of an adjustable stem which allows the young adults to adjust the stem according to their age and body size. In recent years many different types of adjustable handlebars are developed so that the rider had a comfortable ride.
US2015/0344098Al discloses a bicycle stem which has been developed with features that allow quick and easy adjustment of the distance between the handlebar and the shaft of

the steering fork of the bicycle of application. It comprises a bar having at one end a clamp for securing on the tube shaft of the steering fork of the bicycle, a fastener which is associated with a clamp for engaging the handlebar sliding on said bar, including a locking system for fixing the sliding fastener in selective positions along the bar. The user can therefore modify the position of the handlebar by simply releasing the retention of the sliding fastener on the bar of the stem and moving said siding fastener engaged with the handlebar to its new position on the bar of the stem, locking it again in the new position. The drawback of this type of stem is that locking is provided by means of a key which goes through the sliding fastener and can be selectively inserted in a set of holes made on the bar of the stem.
US20150225035Al discloses a bicycle stem, which is adapted to be mounted between a handlebar and a steering tube of a bicycle, includes a body and a clamping member. The body has a clamping end and a connecting end where the connecting end of the body has a through hole for accommodating the steering tube. The body defines a pair of sliding grooves on a top thereof. The clamping member has a hook grip portion and a blade portion extending from one end of the hook grip portion. The blade portion of the clamping member has a pair of sliding protrusions formed on a bottom and slid into the sliding grooves of the body so that the clamping member is slidably mounted to the body. Under this arrangement, the hook grip portion of the clamping member cooperates with the clamping end of the body to clamp the handlebar which is one of the drawbacks in adjusting the handlebar.
Therefore, there is a need of an improvement in the design of the adjustable stem of bicycle to overcome the disadvantages described in the above mentioned stated art and to provide a safe, smooth way of adjusting the stem in the handlebar of the bike so that the young adults in the growing age can adjust their posture and reach in the bike. Thus the bike can be used for longer duration of time. Also people need not to buy a new bike at

each stage of their child growth which makes the adjustable stem a cost effective technology.
OBJECT OF THE INVENTION
The main object of the present invention is to provide an apparatus that allows the riders of a bicycle to adjust the stem and handlebar to variable length from seat of the bicycle.
Another object of the present invention is to provide an apparatus to modify the position of the handlebar according to the posture of the rider.
Yet another object of the present invention is to provide an apparatus that helps the riders in a growing age of 8-16 years to adjust the posture and reach in the bicycle.
Yet another object of the present invention is to provide an apparatus that allows the riders of cycle to adjust the stem at a length of 50 mm-90 mm.
Yet another object of the present invention is to provide an apparatus that allows use of a bicycle for longer duration of time and by multiple riders irrespective of age.
Still another object of the present invention is to provide a cost effective technology that provides solution to the problem of expenditure on a bicycle for growing age riders.
SUMMARY OF THE INVENTION
The present invention relates to an apparatus which is an adjustable stem of a bicycle that allows the riders of a bicycle to adjust the stem and handlebar to variable length from seat of the bicycle so that it can help the riders in a growing age to adjust the posture and reach the bicycle.

In a preferred embodiment of the present invention, an adjustable stem is adapted to be mounted between the handlebar and the steering tube of a bicycle comprising of a stem body with tubular opening on the back portion to accommodate the steering tube and the front portion to be assembled on the handlebar of the bicycle through a fore and aft adjuster. This tubular opening is a through hole on the back portion and is screw fitted to headset of the bicycle while the fore and aft adjuster at the front portion is fitted to the handlebar through bottom screw. The stem is adjusted by a sliding mechanism which comprises a stem slider top insert in sliding portion of the stem body having two slider top screws. The fore and aft adjuster has a LHS and RHS locking system on both sides of the stem body to lock the handlebar at the required distance ranging from 50-90mm.
In another embodiment of the present invention, the sliding mechanism is defined as a mechanism to adjust the stem and handlebar to variable length from seat of the bicycle that helps the riders to adjust the posture and reach in the bicycle. In the sliding mechanism, the stem is adjusted by loosening two slider top screws and one can easily adjust the length of the stem to a longer or shorter size with the help of fore and aft adjuster. When a rider adjusts the handlebar, the fore and aft adjuster is moved to the required distance and locked using the side locks and stem slider top insert is screw fitted.
This adjustable stem allows the riders of cycle to adjust the stem from 50 mm to 90 mm length. This helps the riders in a growing age like 8-16 years to adjust the posture and reach in the bicycle and use the bicycle for longer duration of time. The stem is mountable on a regular bicycle with a normal handle bar.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described with reference to the following drawings:

Figure 1(a) & 1(b) show a perspective view of adjustable stem and a perspective view of adjustable stem with handlebar respectively;
Figure 2(a) - 2(f) show top view, bottom view, side view, side elevated bottom view, front view and back view of adjustable stem respectively;
Figure 3 shows exploded view of adjustable stem with handlebar; and
Figures 4(a) - 4(c) show different sliding positions of adjustable stem with handlebar.
DETAILED DESCRD?TION OF THE INVENTION
The present invention now will be described hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. While the following description details the preferred embodiments of the present invention is not limited in its application to the details of construction and arrangement of the parts illustrated in the accompanying drawings.
In a preferred embodiment of the present invention, an adjustable stem 1 is adapted to be mounted between the handlebar 2 and the steering tube of a bicycle comprising of a stem body 3 with tubular opening 11 on the back portion to accommodate the steering tube and the front portion to be accommodated on the handlebar 2 of the bicycle through a fore and aft adjuster 7. This tubular opening 11 is a through hole on the back portion and has a screw 9 fitted to headset of the bicycle while the fore and aft adjuster 7 at the front portion is fitted to the handlebar 7 through bottom screw 10. The stem 1 is adjusted by a sliding mechanism which comprises a stem slider top insert 4 in sliding portion of the stem body 3 having two slider top screws 8. The fore and aft adjuster 7 has a LHS 5 and RHS 6 locking system on both sides of the stem body 3 to lock the handlebar 2 at the required distance ranging from 50-90mm.

In another embodiment of the present invention, the sliding mechanism is disclosed to adjust the stem 1 and handlebar 2 to variable length from seat of the bicycle that helps the riders to adjust the posture and reach in the bicycle. In the sliding mechanism, the stem 1 is adjusted by loosening the slider top screws 8 and one can easily adjust the length of the stem 1 to a longer or shorter size with the help of fore and aft adjuster 7. When a rider adjusts the handlebar 2, the fore and aft adjuster 7 is moved to the required distance and locked using the side locks and stem slider top insert 4 is screw fitted. This adjustable stem allows the riders of cycle to adjust the stem from 50 mm to 90 mm length. This helps the riders in a growing age like 8-16 years to adjust the posture and reach in the bicycle and use the bicycle for longer duration of time. The stem is mountable on a regular bicycle with a normal handle bar 2.
Figure 1 (a) and (b) depict the preferred embodiment of the present invention, wherein the perspective views of an adjustable stem 1 is described without and with handlebar 2 respectively.
Figure 2 (a)-(f) depict the preferred embodiment of the present invention, wherein the top view, bottom view, side view, side elevated bottom view, front view and back view of adjustable stem 1 are shown respectively.
Figure 3 depict the preferred embodiment of the present invention, wherein an exploded view of adjustable stem 1 with handlebar 2 of a bicycle is described. An adjustable stem
I is adapted to be mounted between the handlebar 2 and the steering tube (not shown in
the drawing) of a bicycle comprising of a stem body 3 with tubular opening 11 on the
back portion to accommodate the steering tube and the front portion to be accommodated
on the handlebar 2 of the bicycle through a fore and aft adjuster 7. This tubular opening
II is a through hole on the back portion and is fitted to headset of the bicycle through
headset holding screws 9 while the fore and aft adjuster 7 at the front portion is fitted to

the handlebar 7 through bottom screw 10. The stem 1 is adjusted by a sliding mechanism which comprises a stem slider top insert 4 in sliding portion of the stem body 3 having two slider top screws 8. The fore and aft adjuster 7 has a LHS 5 and RHS 6 locking system on both sides of the stem body 3 to lock the handlebar 2 at the required distance ranging from 50-90mm. In the sliding mechanism, the stem 1 is adjusted merely by loosening the slider top screws 8 and one can easily adjust the length of the stem 1 to a longer or shorter size with the help of fore and aft adjuster 7.
Figure 4 (a)-(c) depict the preferred embodiment of the present invention, wherein different sliding mechanism of an adjustable stem 1 with handlebar 2 is described. Figure 4 (a) shows the position of the adjustable stem 1 at the extreme 90 mm position from a headset of the bicycle. Figure 4 (b) shows the adjustable stem 1 in between the 50-90 mm position of the sliding area while in Figure 4 (c) shows the adjustable stem 1 at the 50 mm position from the headset. The sliding is done by loosening two top screws 8 on slider top insert 4 so that one can easily adjust the length of the stem to a longer or shorter size. The sliding area range in which the rider can adjust the stem is 50 mm- 90mm. This helps the riders in the growing age 8-16 years to adjust the posture and reach in the bicycle.
While the preferred embodiment of the invention has been illustrated and described, as noted above, many changes can be made without departing from the spirit and scope of the invention. Accordingly, the scope of the invention is not limited by the disclosure of the preferred embodiment. Instead, the invention should be determined entirely by reference to the claims that follow.

CLAIMS
WE CLAIM
1.A mountable adjustable stem (1) for a handlebar (2) of a bicycle comprising of:
a stem body (3) having a front, a back, a top, and a bottom portion;
a tubular opening (11) at the back portion of said stem body (3);
a stem slider top insert (4) on the top portion of said stem body (3); and
a fore and aft adjuster (7) on the front portion of said stem body (3) with at least
one side lock (5, 6) on each left and right hand side of said stem body (3);
wherein:
the tubular opening (11) accommodates a steering tube of the bicycle using
plurality of holding screws (9);
the fore and aft adjuster (7) adjust the handlebar (2) of the bicycle;
said stem slider top insert (4) on the top portion of said stem body (3) is fitted
with a plurality of slider top screws (8); and
said fore and aft adjuster (7) is movable along the stem body (3) to adjust the
handlebar (2) to a predetermined length on the stem body (3).
2.The adjustable stem (1) as claimed in claim 1, wherein said handlebar (2) is adjusted by loosening the slider top screws (8) of stem slider top insert (4) and moving to predetermined length to lock the handlebar (2) by fastening the slider top screws (8).
3.The adjustable stem (1) as claimed in claim 1, wherein said predetermined length is in the range of 50 mm to 90 mm.
4.The adjustable stem as claimed in claim 1, wherein the stem is adjusted by a sliding mechanism.

5.The adjustable stem as claimed in claim 4, wherein the sliding mechanism
comprises:
the stem slider top insert (4) in the top portion of the stem body (3);
the two slider top screws (8); and
the fore and aft adjuster (7) movable along the stem body (3) to adjust the
handlebar (2) to a predetermined length on the stem body (3).
6.The adjustable stem as claimed in claim 1, wherein the said handlebar (2) is
adjusted to a predetermined length by:
loosening two slider top screws (8);
adjusting the length of the stem to a longer or shorter size with the help of fore
and aft adjuster (7) by sliding the stem over handlebar (2);
locking through the side locks (5, 6) at a desired length; and
fitting the screw to the stem slider top insert.