as required , detailed embodiments of the present invention are disclosed herein ; however , it is to be understood that the disclosed embodiments are merely exemplary of the invention , which may be embodied in various forms . therefore , specific structural and functional details disclosed herein are not to be interpreted as limiting , but merely as a basis for claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed structure . embodiments of the present invention comprise an apparatus for attaching an animal to a vehicle whereby a removable attachment mechanism secures the apparatus to a vehicle , a rigid outer member incorporates a curvature that both positions an animal at a safe distance from said vehicle and does not interfere with operation of the vehicle , a stretchable outer member and a stretchable inner member that is substantially contained within the stretchable outer member , and an endpoint connector , whereby the rigid outer member is interposed between the attachment mechanism and the stretchable outer member , the stretchable outer member is interposed between the rigid outer member and an endpoint connector , and an animal and / or object is attached to the endpoint connector , all as shown in fig1 , which is a preferred embodiment . the preferred embodiment 1 of the present invention is shown in fig1 . the drawing depicts a seated bicyclist who operating the vehicle by pedaling , steering , and concentrating on the path ahead . the drawing also shows a small dog that is positioned safely proximate to the rearmost wheel of said moving bicycle , and the dog is receiving exercise as it matches the speed and direction of said bicycle . at all times depicted , the dog is attached to the bicycle and the bicyclist does not attend to the invention directly . the invention is shown in the aspect of the drawing between the seat post of the bicycle and the dog depicted . fig1 shows the preferred embodiment attached to the seat post of said bicycle . the seat post is substantially vertical in orientation relative to the dog and , in the instant drawing the seat post is shown as an extruded metal tube , although any suitable durable external vehicular component may serve to accept the invention . in the preferred embodiment , the seat post accepts the removable attachment mechanism , which appears in fig1 within a dashed circle for illustration purposes . said removable attachment mechanism is secured about the circumference of said seat post within the dimensions of removable attachment mechanism . in the preferred embodiment , the removable attachment mechanism consists of a first opposing plate and a second opposing plate both of metal or metal alloy , preferably aluminum or other metal alloy that is durable and light in weight and does not rust , which are coupled together , preferably , by four penetrating metal or metal alloy bolts that are each secured at one end by a metal or metal alloy nut . it is preferred that each said opposing plate measure approximately 4 . 5 centimeters height and 8 centimeters length , and each incorporates a curvature near its midpoint the inner surface of said curvarture contacting a portion of said bicycle seat post when the embodiment has been attached to the bicycle . said curvature may incorporate on said inner surface a suitable surface material or pattern for increasing friction between the bicycle seat post and opposing plate . each said opposing plate has an elongate projection , and a rigid outer member may be fitted over said elongate projection with said rigid outer member and said elongate projection secured together by a single penetrating double wire snap pin or other removable fastening means . it can be seen in fig1 that said removable attachment mechanism can be rotated about said bicycle seat post to a desirable angle and thereafter said nuts can be tightened so said removable attachment mechanism is fixed at said angle . fig1 a further illustrates a removable attachment mechanism 10 and rigid outer member 29 when coupled together in the preferred embodiment . bicycle seat post 6 is shown substantially vertical and a removable attachment mechanism 10 has been secured to said seat post 6 . one elongate projection 16 is inserted into a rigid outer member 20 , please note fig1 a only shows a part of said rigid outer member cutaway , with said rigid outer member 20 incorporating a curvature and being optionally covered with a grip 22 . in the preferred embodiment , a rigid outer member 20 has a grip 22 so that rigid outer member 20 can be detached from removable attachment mechanism 10 and grasped by a human being to control an attached animal away from the vehicle , nonetheless , other embodiments can have different types of grip 22 , or no grip 22 , and the present invention still obtains . a preferred embodiment utilizes metal or metal alloy , such as an alloy with aluminum , zinc or titanium , for manufacture of removable attachment mechanism 10 , however , any strong and durable material may be used , for example plastic , hard rubber , carbon fiber or wood . fig2 shows the preferred embodiment 1 of the present invention as such is being viewed from above while attached to a bicycle seat post . rigid outer member 20 is shown alternately being placed on the left side or the right side of a bicycle , and a second rigid outer member 20 can be coupled to the attachment mechanism 10 so that two animals may be controlled and exercised at the same time by a single human being during operation of the bicycle . the curvature described , which need not be limited to a precise angle but is set at the time of manufacture , of rigid outer member 20 is depicted in the preferred embodiment . likewise , rigid outer member 20 can have any suitable length , width or other dimensional attributes provided that rigid outer member 20 exhibits rigidity in relation to a stretchable outer member and a stretchable inner member ( depicted in fig2 a ). in preferred embodiments , rigid outer member 20 is made from metal or metal alloy , for example aluminum or steel , however , any suitable material having the quality of rigidity relative to the stretchable aspects of the invention , namely stretchable outer member 40 and stretchable inner member 30 will suffice . a preferred embodiment has its rigid outer member 20 approximately forty centimeters in length , nonetheless , such length need not be precise or a set value in order for the invention to obtain . in the preferred embodiment , rigid outer member 20 is covered by a grip 22 near one end and said end is coupled to removable attachment mechanism 10 by inserting an elongate projection 16 into said rigid outer member 20 so that two holes in rigid outer member 20 align with a channel through said elongate projection 16 . a fastening means , in the preferred embodiment a double wire snap pin ( depicted in fig3 ), is inserted so that by passing through said holes and said channel said rigid outer member 20 is firmly but removably secured to said elongate projection 16 of said removable attachment mechanism 10 . a stretchable inner member 30 of the present invention is illustrated in fig2 a and in fig4 . referring again to fig2 , the preferred embodiment is depicted with rigid outer member 20 interposed between removable attachment mechanism 10 and stretchable outer member 40 . rigid outer member 20 contributes firm control over an animal while stretchable outer member 40 and stretchable inner member 30 contribute elasticity and flexibility to the present invention . stretchable outer member 40 and stretchable inner member 30 are shown as they are interposed between said rigid outer member 20 and endpoint connector 50 . in the preferred embodiment , stretchable outer member 40 and stretchable inner member 30 are each approximately forty centimeters in length , nonetheless , practically any length a vehicle accommodates can be utilized and the invention still obtains . fig2 a is a cutaway section drawing that illustrates stretchable outer member 40 substantially containing stretchable inner member 30 in the preferred embodiment . it should be noted that the ends of stretchable member 30 may protrude beyond the ends of stretchable outer member 20 without affecting the present invention . conversely , said ends of stretchable member 30 may not so protrude . stretchable inner member 30 and stretchable outer member 40 may be stretched by the tension created between an attached animal and a vehicle as they oppose one another , and stretchable inner member 30 and stretchable outer member 40 operate together to contribute varying bands of resistance during stretching . the combination of stretchable inner member 30 and stretchable outer member 40 reduces the risks presented by abrupt termination of stretching , and hence instant loss of elasticity , that would occur if stretchable inner member 30 was inelastic and did not stretch , as commonly is the case with other animal leashes . it should be noted that , as the combination of stretchable inner member 30 and stretchable outer member 40 stretches farther and farther under load , the resistance force that opposes the direction of the stretching increases and thereby generates feedback information to both attached animal and vehicle operator alike . at the same time , energetic movements by said animal are damped and the animal controlled . the combination of stretchable inner member 30 and stretchable outer member 40 in all embodiments of the present invention reduce the effects of sudden animal lunges and other energetic behavior , for example by preventing injury to an attached animal &# 39 ; s body and / or damage to a vehicle or human being . although fig2 a shows the preferred embodiment with stretchable inner member 30 being made of bungee cord and stretchable outer member 40 being made of elastic thermoplastic resin , one skilled in the pertinent art would know that any suitable stretchable material or materials may be utilized for stretchable inner member 30 as well as for stretchable outer member 40 without departing from the present invention provided a material stretches . said material or materials should also have the quality of substantially returning to their status quo ante once they are no longer under tension . fig3 illustrates removable attachment mechanism 10 in the preferred embodiment when the present invention is not attached to a vehicle . rigid outer member 20 , and grip 22 , has been situated over a single elongate projection 16 with said elements securely coupled by double wire snap pin 18 . a second elongate projection 16 is shown without being coupled to rigid outer member 20 . fig3 further illustrates a first opposing plate and a second opposing plate of a removable attachment mechanism 10 insofar as the respective curvatures and friction surfaces of said first opposing plate and said second opposing plate appear in the preferred embodiment . in all embodiments of the present invention , said removable attachment mechanism 10 will be situated at one terminus of the invention and an endpoint connector will be situated at the other terminus . illustrated in fig4 is endpoint connector 50 in the preferred embodiment of the present invention whereby said endpoint connector 50 is shown to have a swivel snap hook with sliding bolt 54 at one end of said endpoint connector 50 and an opening at the opposite end which admits both stretchable outer connector 40 and stretchable inner connector 30 . in the preferred embodiment , cover 56 may be alternatively opened or closed to allow access inside endpoint connector 50 , it being observable that a different cover or more than one cover , or no cover , may be utilized without departing from the present invention by alternative embodiments . as depicted for the preferred embodiment in fig4 , cover 56 has been opened so that a length of stretchable outer member 40 is exposed at one end . a ring 58 has been placed over stretchable outer member 40 . stretchable inner member 30 has been inserted through a stopper 59 and tied into a knot 32 at one end . although not shown , it should be noted the opposite end of said stretchable outer member 40 has been inserted into a second ring 58 , the opposite end of said stretchable inner member 30 has been inserted into a second stopper 59 , and the assembly thus described having been inserted into a rigid outer member 20 , in the preferred embodiment . the preferred combination of rigid outer member 20 , endpoint connector 50 , stretchable outer member 40 , stretchable inner member 30 , a first ring 58 , a second ring 58 , a first stopper 59 , and a second stopper 59 securely maintains corresponding stretch and physical relationships between stretchable outer member 40 and stretchable inner member 30 when the invention is under load . while said combination is the preferred embodiment , differing embodiments can be used provided they maintain corresponding stretch and physical relationships between stretchable outer member 40 and stretchable inner member 30 when the apparatus is under tension without departing from the present invention , as may be readily seen in fig4 . from the foregoing , it will be observed that numerous variations and modifications may be effected without departing from the spirit and scope of the invention . it is to be understood that no limitation with respect to the specific apparatus herein is intended or should be inferred . it is , of course , intended to cover by the appended claims all such modifications as fall within the scope of the claims .
an apparatus for safely attaching one or more animals to a vehicle and enabling a human being to control an animal hands - free while she concentrates on operating the vehicle . the apparatus stretches to mitigate energetic movements , and the stretching does not terminate abruptly , thereby reducing the prospect of injury to a vehicle operator and / or to an attached animal .