Abstract:
A bouncing rod with an adjustable pneumatic pressure includes a bouncing device and a pressurizing device below the bouncing device. The air pressure of the bouncing device can be set by an adjusting valve and kept to a constant value by supplying air into the bouncing device through each bounce.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1) Field of the Invention  
           [0002]    The present invention relates to a bouncing rod, especially to a bouncing rod with an adjustable pneumatic pressure.  
           [0003]    2) Description of the Prior Art  
           [0004]    The conventional bounce rod generally comprises a tensile spring to provide bounce force once the tensile spring is compressed by user. Moreover, the spring force of the bounce rod can also be provided by air bag, or more advanced ways such as pneumatic pressure or oil pressure. However, the conventional bounce rod generally has leakage problem. Therefore, air inflator is required to supply air to a bouncing device of the bounce rod, this is inconvenient especially for outdoor usage.  
           [0005]    To overcome this problem, an inflating bar for supplying air to the bouncing device is directly provided at the bouncing device and the user can operate the inflating bar for supplying air to the bouncing device. However, the bouncing device is also air-leaky. The user should frequently operate the inflating bar for supplying air to the bouncing device.  
         SUMMARY OF THE INVENTION  
         [0006]    It is an object of the present invention to provide a bouncing rod with a fixed pneumatic pressure. A pressurizing device is provided below a bouncing device of the bouncing rod to supply air to the bouncing device. The excessive air is leaked through an adjusting valve to keep constant pressure in the bouncing device.  
           [0007]    It is another object of the present invention to provide a bouncing rod with an adjustable pneumatic pressure. For example, a child may need 100 kg bouncing force and an adult may need 200 kg bouncing force. By adjusting the adjusting valve, the air pressure in the bouncing device can be adjusted.  
           [0008]    The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing, in which: 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0009]    [0009]FIG. 1 shows a cross section view of the present invention;  
         [0010]    [0010]FIG. 2 shows a cross section view of the bouncing device of the present invention; and  
         [0011]    [0011]FIG. 3 shows a cross section view of the adjusting valve of the present invention. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0012]    As shown in FIG. 1, the bounce rod  1  according to a first preferred embodiment of the present invention has a handle  11 , a supportive rod  15 , two retaining stages  13 ,  14  and a bouncing device  20  connected therebetween. The lower retaining stage  14  has pedals  12  on both sides thereof. The bouncing device  20  has a pressurizing device  3  at lower end thereof and an adjusting valve  4  at top end thereof and used for pressure adjustment.  
         [0013]    As shown in FIG. 2, the bouncing device  20  basically comprises a cylinder  2  assembled with the retaining stages  13 ,  14  and has a piston  21  therein. The piston  21  is connected to the pressurizing device  3  through an axial pipe  23  and has a through hole  210  therein. The axial pipe  23  is of cylinder shape therein and has a pressurizing piston  32  linked to the pressurizing device  3  through a link rod  31 . The axial pipe  23  has a sliding cap  22  at bottom of the cylinder  2  to provide support such that the axial pipe  23  has longitudinal movement. The link rod  31  is also kept to have longitudinal movement by the sliding cap  22 .  
         [0014]    The pressurizing device  3  uses the pressurizing piston  32  for inflating air therein and supply air to a pressure chamber (not labeled) of the cylinder  2  through the through hole  210 .  
         [0015]    The pressure chamber can push the piston  21  such that the piston  21  pushes the axial pipe  23  outward. Afterward, the piston  21  compresses the air in the cylinder  2  such that the axial pipe  23  has reciprocating movement to provide jumping force.  
         [0016]    The pressurizing device  3  is moved with a stroke length L at each bounce. The pressurizing device  3  mainly comprises a link rod  31  connected to the pressurizing piston  32  at upper end thereof and has a slide-proof leg  34  corresponding to an end opening  310  of the axial pipe  23 . The link rod  31  is connected to the slide-proof leg  34  through a fixing pin  340  such that the slide-proof leg  34  has synchronous movement with the link rod  31 . The slide-proof leg  34  has resilient force provided by a spring  33  and has a distance L away from the slide-proof leg  34  when it is not pressed. When the user bounces back to ground, the slide-proof leg  34  acts against the resilient force of the spring  33  to push upward the link rod  31  and the pressurizing piston  32  is driven. A compressed air is supplied to the cylinder  2  and the pressurizing device  3  is moved with a stroke length L at the moment the user bounces on the ground. The pressurizing piston  32  supplies air to the cylinder  2  and the excessive air are leaked through the adjusting valve  4 .  
         [0017]    Moreover, a buffer washer  35  is provided at inner face of the slide-proof leg  34  and corresponding to the end opening  310  of the axial pipe  23 , thus buffering the rushing stress on the buffer washer  34 . The slide-proof leg  34  has a hook portion  341  for buckling the end opening  310 . The end opening  310  moves between the hook portion  341  and the buffer washer  35  to define the stroke length L. The link rod  31  is driven through the relatively small stroke length L, thereby supplying air to the pressurizing piston  32 . The cylinder  2  is kept to high pneumatic pressure by the pressurizing piston  32  and the excessive air is leaked through the adjusting valve  4 .  
         [0018]    In FIG. 3, the adjusting valve  4  is connected to the cylinder  2  through a cover plate  24 , more particularly; the adjusting valve  4  is connected to the cover plate  24  through the combination of a threaded bolt  42  and a threaded nut  43 . A knob  41  is screwed to an outer thread of the threaded bolt  42 . The threaded bolt  42  has a bead groove  45  and a passageway  450 . A steel bead  46  is placed atop the bead groove  45  to adjust air drag in the passageway  450 . The bead  46  is clamped to the bead groove  45  by a spring  47 . The tension of the spring  47  can be adjusted by adjusting the knob  41 , thereby adjusting the air drag in the passageway  450 . The bead  46  has tighter sealing to the bead groove  45  when the spring  47  has larger tension by adjusting the knob  41 , and the air drag in the passageway  450  is increased. This condition is suitable for adult user. The bead  46  has looser sealing to the bead groove  45  when the spring  47  has smaller tension by adjusting the knob  41 , and the air drag in the passageway  450  is reduced. This condition is suitable for children user. Moreover, the pneumatic pressure can be leaked through the bead  46 .  
         [0019]    When the knob  41  is screwed to the lowest end, an abutting post  48  arranged below the knob  41  abuts against the bead  46  by the lower face  440  thereof. The bead  46  tightly abuts against the bead groove  45  and the air is not leaked therethrough. At this condition, highest pressure can be provided and the pressurizing device  3  will not supply air.  
         [0020]    As can be seen from above description, the knob  41  can be operated to adjust the air drag in the bead groove  45  and to adjust the pressure in the cylinder  2 . The pressurizing device  3  can be used to keep a constant pressure in the cylinder  2 .  
         [0021]    Moreover, the adjusting valve  4  can be designed to have buffering vent and can be provided additional inflating opening to inflating air for first time usage.  
         [0022]    Although the present invention has been described with reference to the preferred embodiment thereof, it will be understood that the invention is not limited to the details thereof. Various substitutions and modifications have suggested in the foregoing description, and other will occur to those of ordinary skill in the art. Therefore, all such substitutions and modifications are intended to be embraced within the scope of the invention as defined in the appended claims.