Patent Publication Number: US-2009229536-A1

Title: Pet stroller for bicycle attachment

Description:
BACKGROUND OF THE INVENTION 
     (a) Field of the Invention 
     The invention is related to pet apparatus, particularly to a pet stroller for bicycle attachment. 
     (b) Description of the Prior Art: 
     The conventional bicycle use dog jogger as shown in  FIG. 8  is constituted by a slightly elastic branch rod  1  made of polyurethane material, wherein the branch rod  1  is attached to the vicinity of axel of rear wheel  3  of bicycle  2  at one end thereof and is tied with a leash at the rear end thereof to connect with a pet collar, so that when bicycle  2  is ridden to march forward, the pet is pulled by the leash tied at rear end of the branch rod  1  to move along. However, as the bicycle use dog jogger is attached to the vicinity of axel of rear wheel  3  of bicycle  2 , when the pet is not moving along with the marching direction of bicycle  2 , the rear wheel  3  of bicycle  2  may be swung to seriously affect the safety of bicycle  2  in marching movement. Further, branch rod  1  made of polyurethane is not strong enough to pull large dogs, and usually appears a fragmentation phenomenon after time of use, therefore it is disadvantageous to be easily damaged. 
     Another kind of conventional bicycle use dog jogger as shown in  FIG. 9  having one metal branch rod  1 A is attached on seat post  3 A of bicycle  2 A at one end thereof and is tied with the leash at the other end thereof, wherein as this kind of bicycle dog jogger design is attached on the seat post  3 A, when pet is not moving along with the marching direction of bicycle, the self-weight of rider on top of the seat post  3 A makes the bicycle  2 A march more stably, uneasily pulled by the pet. However, since the metal branch rod  1 A is attached on seat post  3 A to extend sidewise from bicycle  2 A, when rider is stepping on the paddles of bicycle  2 A, the thigh of rider tend to collide with the metal branch rod  1 A that causes inconvenience of rider in riding bicycle  2 A. 
     Additional another bicycle use dog jogger as shown in  FIG. 10  is similarly attached on seat post  3 B of bicycle  2 B to be extended sidewise from bicycle  2 B and further extended downward to appear a “U” shaped rod  4 B, and rear end of the “U” shaped rod  4 B is constituted by a spring, whereby the pet leash is tied to said spring to allow the spring to buffer the lateral force imposed by the pet. Nonetheless, this kind of bicycle use dog jogger has a bigger volume and a higher cost due to that its “U” shaped rod  4 B is made of metal material, and further, for this kind of bicycle dog jogger, the thighs of rider may still collide with the rod sidewise extended away from bicycle  2 B when rider steps on the paddles of bicycle  2 B, that also causes inconvenience of rider in riding bicycle  2 B. 
     SUMMARY OF THE INVENTION 
     The main purpose of the invention is to disclose a pet stroller for bicycle attachment which has a simple structure with characteristics of excellent strength and durable usage. 
     The second purpose of the invention is to disclose a pet stroller for bicycle attachment which can eliminate the lateral pulling force imposed by the pets moving in a direction different from the marching direction of the bicycle,in addition,when pet has a sudden rush, this apparatus can effective offer a buffer for rider. 
     To achieve aforesaid purposes, the invention discloses a pet stroller for bicycle attachment which is installed on the seat post of bicycle and comprises a first rod member and a second rod member, wherein first rod member is attached to the seat post at one end thereof and is extended to rear of seat post of the bicycle at another end thereof, further, intersection angle between first rod member and the longitudinal axis of seat post appears 90°, while second rod member being attached to one end of first rod member far away from seat post is sidewise extended away from bicycle, and is further made with a leash-tying portion, wherein at least one rod member is partially made of elastic material. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective schematic view of the invention. 
         FIG. 2  is a schematic view of the invention in usage status showing that the invention is mounted on seat post of the bicycle. 
         FIG. 2B  is a frontal schematic view showing the invention is mounted on the seat post. 
         FIG. 3  is a schematic view showing the status of the invention being imposed by a lateral force. 
         FIG. 4  is a perspective view of the locking elements of the invention. 
         FIG. 5  is a side cross-sectional view of the invention showing that locking elements are installed on the spring. 
         FIG. 6  is a perspective schematic view of the second preferred embodiment of the invention. 
         FIG. 7  is a perspective schematic view of the third preferred embodiment of the invention. 
         FIG. 8  is a schematic view of conventional bicycle dog jogger. 
         FIG. 9  is a schematic view of another conventional bicycle dog jogger. 
         FIG. 10  is a schematic view of additional another conventional bicycle dog jogger. 
     
    
    
     DETAIL DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     A pet stroller for bicycle attachment disclosed by the invention as shown in  FIGS. 1 and 2  is installed on the seat post  11  of bicycle (not shown in the Fig.) and mainly comprises a connector component  21 , a first rod member  31  and a second rod member  41 , wherein: 
     The connector component  21  has a join part  22  comprising two relative clamping pieces  221 ,  222  at one end thereof and is further extended to have a connector pipe  24  at the rear end thereof to affix on seat post  11  of the bicycle through clamping by the join part  22 . As shown in  FIG. 2B , when connector component  21  is affixed on the seat post  11 , whether the seat post  11  an inclined angle or not, the intersection angle θ between connector pipe  24  of connector component  21  and the longitudinal axis y of seat post  11  appears 90°, further, the connector pipe  24  is made with a fixing portion  26  having an external threaded section in the embodiment; 
     First rod member  31  comprises a spring  32  and a metal rod  34 , wherein one end of spring  32  is made with a lock-connect portion  36  which is made with an internal threaded portion  361  for matching with external threaded portion of fixing portion  26  in the embodiment, wherein internal threaded section  361  of lock-connect portion  36  of first rod member  31  is mutually lockingly connected with external threaded section of fixing portion  26  of connector pipe  24  to allow first rod member  31  to affix to connector pipe  24  of connector component  21 , and metal rod  34  of first rod member  31  is extended toward the rear of seat post  11  of the bicycle, further, since first rod member  31  is relying on lock-connect portion  36  to attach with connector pipe  24 , the intersection angle θ between first rod member  31  and saddle longitudinal axis y also appears 90°; 
     Second rod member  41  is made of metal material, wherein second rod member  41  with its top end thereof being affixed to the rear end of metal rod  34  of first rod member  31  far away from seat post  11  is extended sidewise from bicycle (intersection angle between second rod member  41  and first rod member  31  appears 90°) and is made with a through hole type leash-tying portion  42  at the rear end thereof for tying a pull leash. 
     For practical application of said described structure of the invention as shown in  FIG. 3 , when pet imposes a lateral pulling force on the bicycle, the pet stroller for bicycle attachment is bended at spring  32  whereby to buffer the lateral force in order to reduce direct impact of lateral force on seat post  11 . Additionally, as first rod member  31  of the pet stroller for bicycle attachment is first extended a predetermined distance to the rear of seat post  11  of the bicycle, and second rod member  41  is further sidely extended away from bicycle, the thigh of the rider in riding bicycle won&#39;t collided by the pet stroller for bicycle attachment thereby allowing rider to step on the bicycle paddles smoothly. 
     Subsequently, as referring to  FIGS. 4 and 5 , spring  32  of first rod member  31  is further installed with a locking element  51  comprising two relative pieces like structures  52  for ring installation in the clearance  321  of spring  32  to limit deformation of spring  32  when it is forced to deform, wherein number of locking elements  51  installed on spring  32  can be changed to randomly adjust the coefficient of elasticity provided by spring  32  corresponding to different requirements. 
       FIG. 6  is the second preferred embodiment of the invention, wherein first rod member  31  is constituted by a metal rod while second rod member  41  is constituted by connecting a spring  32  and a metal rod  44 , whereby through the function of spring  32  of second rod member  41 , the pet imposed lateral force can be similarly buffered.  FIG. 7  is the third preferred embodiment of the invention, wherein first rod member  31  and second rod member  41  are respectively constituted by connecting a spring  32  and a metal rod  34 ,  44 . Nonetheless, it is particularly mentioned herein, installing location of spring  32  is not limited to the disclosed types of above said embodiments, all of the arrangements to allow the impact on seat post  11  of the bicycle caused by pet imposed lateral force acting on first rod member  31  and second rod member  41  of the invention to be buffered through the effect of spring  32  shall be considered as the equivalent embodiments of the invention.