DIRECTION CHANGE STRUCTURE OF HANDLEBAR FOR BABY STROLLER BACKGROUND OF THE INVENTION 5 1. Field of the Invention The present invention relates to a direction change structure of handlebar for baby stroller, particularly to a novel design of a direction change structure of reversible handlebar for baby stroller. 10 2. Brief Description of the Prior Art Handlebar for baby stroller in early stage is a fixed type design, hence direction change of handle is impossible. When infant baby is sitting on the baby stoller, adult can neither catch the facial expressions nor know the behavior of the baby, as the conventional baby stroller is 15 often made in such a way that the baby is facing forward and the adult pushes behind. Hence, the baby is liable to produce emotions with anxiety and uneasiness. In view of this reason, the inventor of this invention had proposed a baby stroller with a reversible handlebar, in which the infant baby sitting 20 on the stroller can see the face of the pusher pushing the baby stroller. Therefore, the infant baby can feel at ease and the pusher can also pay his attention to the behavior of the baby all the time so as to avoid any occurrence of possible danger.
2 The above baby stroller with a reversible handlebar can refer to the Taiwanese Patent Gazette No. 90214973 opened to public on July 21, 2003 and entitled "DIRECTION CHANGING DEVICE FOR A STROLLER HANDLE". In this case, actuators are provided on the 5 upper ends of the handlebar and snap-fit members on the lower ends, and interlinking members for linking the actuators and the snap-fit members are assembled within the tube body of the handlebar. Further, stop-pins are penetrated through the handlebar for defining the set-up position of springs provided on the interlinking members. Snap-fit holders each 10 having two slots disposed at the front and rear face respectively are provided in the inner flank surfaces of the snap-fit members. Extending pieces having snap-fit blocks thereon extend from assembly members provided on both sides of the chair-back frames, and snap-fit blocks are provided on the rear ends of the side frames of the front wheels support 15 rods, the rear wheels support rods and the chair-back rods. Positioning members are attached to the middle of the side frame, which have snap-fit blocks and hooks provided thereon. Configuring like this, the handlebar in normal condition is in the front position having the baby facing forward such that the snap-fit holders on the snap-fit members and 20 the slots in the rear face are engaged respectively with snap-fit blocks on the ends of the side frames and the hooks on the assembly members. When the direction of the handlebar is to be changed, the actuators are moved upwardly so that the snap-fit members are detached from the 3 engagement with the snap-fit blocks and the hooks, and then the handlebar is moved over to the front side in such a manner that the snap-fit holders on the snap-fit members and the slots in the front face are engaged respectively with snap-fit blocks on the ends of the side 5 frames and the hooks on the assembly members. In this way, the handlebar can be locked in place after direction change, and the direction of the handlebar can be changed at any time as desired. In this prior art, both ends of the handlebar are attached to the top ends of a stationary body in bending shape. As the stationary body is in 10 bending shape and the handlebar is pivotally mounted on the top ends of the stationary body, the joints of the handlebar and the stationary body is located on a rear upper position of the center of the stationary body. When the handlebar of the baby stroller is in the position having the baby facing forward, the height of the handlebar and the distance 15 between the handlebar and the rear wheels of the baby stroller are just appropriate enough for user to push the handlebar. However, when the handlebar is in the position having the baby facing the pusher, the height of the handlebar will become lower and the distance between the handlebar and the rear wheels becomes too close. Hence, this doesn't 20 match the principle of ergonomics when user pushes the baby stroller. SUMMARY OF THE INVENTION 4 In view of the above reasons, the inventor of the present invention hereby proposes a direction change structure enabling the direction change of handlebar for baby stroller, in which the height of the handlebar and the distance between the handlebar and the rear wheels or 5 the front wheels are just appropriate for user to push. In order to achieve above objects, the present invention proposes a direction change structure of handlebar for baby stroller, in which two coupling pieces are provided respectively on the terminals of the chair-back frames, and the lower ends of said coupling pieces extend 10 forwardly to form extending portions such that said handlebar is pivotally mounted thereon in eccentric manner. Two telescopic sleeves enabling telescopic motion relative to the handlebar are linked to the handlebar. First snap-fit female portions are provided on the inner flank surfaces of said telescopic sleeves, while first snap-fit male 15 portions and second snap-fit male portions capable of engaging with the first snap-fit female portions are provided on the outer flank surfaces of the armrests. The first snap-fit male portions and the second snap-fit male portions are positioned in such a manner that the baby stroller is selectively in the position having the child facing forward or facing the 20 pusher when the first snap-fit male portions or the second snap-fit male portions engage with the snap-fit female portions. Configuring like this, the joints of the handlebar for direction change are deflected forwardly and downwardly at the same time, so that the handlebar is always in the 5 state having the same height to allow users push baby stroller comfortably, no matter whether the baby stroller is pushed in the position having the baby facing forward or facing the pusher. 5 BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS Figure 1 is a perspective exploded view showing the direction change structure for handlebar of baby stroller of the present invention. Figure 2 is a schematic assembled side view showing the direction 10 change structure for handlebar of baby stroller of the present invention. Figure 3 is a schematic assembled front view showing the direction change structure for handlebar of baby stroller of the present invention. Figure 4 is a schematic front view showing the operation of detaching the telescopic sleeves from the snap-fit male portions in the 15 direction change structure for handlebar of baby stroller of the present invention. Figure 5 is a schematic side view showing the operation of direction change in the direction change structure for handlebar of baby stroller of the present invention. 20 Figure 6 is a schematic view showing that the handlebar is pushed to the rear position in the direction change structure for handlebar of baby stroller of the present invention.
6 DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS The objects, the technical contents and the expected effectiveness of the present invention will become more apparent from the detailed 5 description of the preferred embodiment in conjunction with the accompanying drawings. Firstly referring to Figure 1 to 3, the baby stroller of the present invention is provided with two armrests (1) on both sides thereof. The front ends of the armrests (1) are respectively connected with the front 10 wheel frames (2) and the rear wheel frames (3) having different inclined directions, while the rear ends thereof are assembled to the chair-back frames (4). Two coupling pieces (5) are provided respectively on the terminals of the chair-back frames (4). Both ends of the handlebar (6) are pivotally mounted on the coupling pieces (5) respectively. Further, 15 telescopic sleeves (7) enabling telescopic motion relative to the handlebar (6) are linked externally with both ends of the handlebar (6). First snap-fit female portions (71) are provided on the inner flank surfaces of the telescopic sleeves (7), while first snap-fit male portions (11) and second snap-fit male portions (12) are provided on the outer 20 flank surfaces of the armrests (1). The first snap-fit male portions (11) and the second snap-fit male portions (12) are positioned in such a manner that the baby stroller is in the position having the child facing forward or facing the pusher when the first snap-fit male portions or the 7 second snap-fit male portions mate with the snap-fit female portions. The technical feature of the present invention lies in that the lower ends of the coupling pieces (5) extend forward to form extending portions (51) so that the handlebar (6) is pivotally mounted thereon in eccentric 5 manner. Configuring like this, the joint of the handlebar (6) for direction change are deflected forwardly and downwardly at the same time, so that the handlebar (6) is always in the state having the same height no matter whether the baby stroller is pushed in the front or the rear positions. 10 When the handlebar (6) is in the front position, as shown in Figures 2 and 3, the first snap-fit female portions (71) of the telescopic sleeves (7) on the handlebar (6) is engaged with the first snap-fit male portions (11) on the outer flank surfaces of the armrests (1). If the handlebar (6) is to be moved to the rear position having the child facing the pusher, as 15 shown in Figure 4, firstly the first snap-fit female portions (71) of the telescopic sleeves (7) on the handlebar (6). are detached from the engagement with the first snap-fit male portions (11) on the armrests (1), then the handlebar (6) is pivotally moved over to the rear position with the joints for direction change on the coupling pieces (5) as the axes, as 20 shown in Figures 5 and 6. Hence, the handlebar (6) is fixed in place by the snap-fit action between the first snap-fit female portions (71) of the telescopic sleeves (7) and the second snap-fit male portions (12) on the handlebar (6) after moving over to the rear position.
8 According to the present invention, the telescopic motion of the telescopic sleeves (7) relative to the handlebar (6) is accomplished by providing elastic elements (72) compressed along the moving direction of the telescopic sleeves (7), as shown in Figures 3 and 4. Each of the 5 elastic elements (72) is limited at its both ends by respective telescopic sleeve (7) and a blocking element (61). According to the present invention, the first snap-fit female portions (71) of the telescopic sleeves (7) are snap-fit grooves in this embodiment, while the first and the second snap-fit male portions (11), 10 (12) are respectively protruding posts. As stated above, the lower ends of the coupling pieces extend forward to form extending portions so as to allow the eccentrically disposed handlebar pivotally mounted thereon in such a manner that the joints of the handlebar for direction change are deflected forwardly and 15 downwardly at the same time, the handlebar is always in the state having the same height no matter whether the baby stroller is in the front position or the rear position. Moreover, the handlebar can maintain an appropriate distance with either the rear wheels or the front wheels so as to achieve the object of pushing the baby stroller very comfortably from 20 either front or rear directions.