Training device for hitting a baseball

A training device for hitting a baseball is disclosed. The device includes a baseboard, an upstanding column, and flexible duct, and a transverse arm. A longitudinal rotary axle is located below the base side of the transverse arm; a rotary axle is inserted into the upper end of the upstanding column; an elastic pad is set in the engaging interface between the rotary axle and the inner wall of the upstanding column, and an engaging pipe for engaging the flexible duct is set above the end of the transverse arm. The transverse arm is rotated around the axle center of the base side, so that a baseball on a bearing disk of the flexible duct can adjust to the preset hitting position within the range of the rotation radius of the transverse arm.

BACKGROUND OF THE INVENTION 
The present invention relates to a training device for hitting a baseball, 
particularly, to a device for simulating the baseball within the hitting 
section of the internal angle and external angle of the baseboard. 
DESCRIPTION OF THE PRIOR ART 
The conventional training device for hitting a baseball, is shown in FIG. 
5, in which a upstanding column (2) is longitudinally extended from the 
middle part of the planar baseboard (1). The height of the upstanding 
column is adjusted by the adjusting ring (21) on the middle portion 
thereof, and a flexible duct (3) with proper height is engaged above the 
upstanding column (2). A bearing disk (31) for bearing baseball (A) is 
formed on the upper part of the flexible duct (3), and a linkage line is 
connected between said baseball (A) and said baseboard (1). 
In accordance with the structure described above, said baseball is 
supported at a proper height above the middle part of the baseboard, and 
the height can be adjusted. The baseballer can hit the baseball above the 
baseboard at different heights for training. Because a linkage line in the 
baseball is connected to the baseboard, the baseball only flies within a 
preset range. From the structure described above, said baseball is 
supported above the middle part of the baseboard, and the height can be 
adjusted in the vertical direction, so that the training device for 
hitting a baseball can not simulate the hitting section within the range 
of the internal angle and external angle of the baseboard. 
SUMMARY OF THE INVENTION 
For the reason described hereinabove, a training device for hitting a 
baseball according to the present invention is provided, wherein a 
longitudinal rotary axle is formed below the base side of a transverse 
arm; a rotary axle is inserted on the upper end of an upstanding column; 
an elastic pad is set in the engaging interface between the rotary axle 
and the inner wall of the upstanding column; and an engaging pipe for 
engaging the flexible duct is set above the end of said transverse arm. By 
the structure described above, the transverse arm is rotated around the 
axle center of the base side, so that the baseball on the bearing disk of 
the flexible duct can adjust to the preset hitting position within the 
range of the rotation radius of the transverse arm, therefore the present 
invention can simulate the hitting section within the range of the 
internal angle and external angle of the baseboard.

DESCRIPTION OF THE PREFERRED EMBODIMENT 
As shown in the FIGS. 1 and 2, a training device for hitting a baseball 
according to the present invention comprises a baseboard (1), upstanding 
column (2), transverse arm (4), and a flexible duct (3). Upstanding column 
(2) is longitudinal extended from the middle part of the planar baseboard 
(1), and the height of the upstanding column is adjusted by an adjusting 
ring (21) on the middle portion thereof. 
Furthermore, a transverse arm (4) is mounted on the upper end of the 
upstanding column (2), and the length thereof is approximately equal to 
the radius of the baseboard. A longitudinal rotary axle (41) (see FIG. 2) 
is formed below the base side of said transverse arm (4), the rotary axle 
(41) is inserted into the upper end of said upstanding column (2). Said 
transverse arm (4) is rotated around the axle center of the base side, and 
an engaging pipe (42) for engaging the flexible duct (3) is set above the 
end of said transverse arm. A longitudinal slit (411) (see also FIG. 4) is 
formed in the end of the rotary axle (41) in order to have a preferred 
engagement between upstanding column (2) and the rotary axle (41) thereof. 
When the rotary axle (41) is engaged with the upstanding column (2), a 
proper elastic contact between the rotary axle (41) and upstanding column 
(2) is provided by the slit (411). 
Moreover, a flexible duct (3) with proper height is engaged above the 
engaging pipe (42). A bearing disk (31) for bearing baseball (A) is formed 
on the upper part of the flexible duct (3), and said flexible duct is made 
of flexible material, for example, rubber material. 
A linkage line (A1) in the baseball (A) is connected to the baseboard (1), 
and thus the baseball only flies within a preset range. By the structure 
described above, said transverse arm (4) is rotated around the axle center 
of the base side to a preset position, so that the baseball (A) on the 
bearing disk (31) of the flexible duct can adjust to the preset hitting 
position within the range of the rotation radius of the transverse arm (4) 
by exerting force (F), as shown in FIG. 3. Thus the present invention can 
simulate the hitting section within the range of the internal angle and 
external angle of the baseboard. When the baseballer hits said baseball 
(A), generally, the transverse arm (4) of the training device is 
maintained in the preset position. If the baseball hit by the baseballer 
contacts the flexible duct (3), although the flexibility of the flexible 
duct (3) can absorb some beating force of the baseball, part of the force 
will transfer to the transverse arm (4). Then the transverse arm (4) 
rotates rapidly around the upstanding column. It is possible to hurt the 
baseballer, therefore a resistance is needed for constraining the rapid 
rotation of the transverse arm (4). For the reason described above, an 
elastic pad or insert (5) is set in the engaging interface between the 
rotary (41) axle and the inner wall of the upstanding column (2), as shown 
in FIGS. 2 and 4. Insert (5) has a plurality of circular elastic ridges 
(51) contacting with the inner wall of the upstanding column (2). Ridges 
(51) are formed in the outer circumference of said elastic pad (5) so that 
the transverse arm is intensely engaged with the elastic pad to create a 
proper frictional force with rotary axle (41) of the transverse arm by 
said elastic pad (5), and the rotation thereof is constrained, so the 
safety of the baseballer is increased.