the detailed description set forth below in connection with the appended drawings is intended as a description of the presently preferred embodiment of the invention , and is not intended to represent the only form in which the present invention may be constructed or utilized . the description sets forth the functions and sequence of steps for constructing and operating the invention in connection with the illustrated embodiment . it is to be understood , however , that the same or equivalent functions and sequences may be accomplished by different embodiments that are also intended to be encompassed within the spirit and scope of the invention . the toy vehicle of the present invention as illustrated in fig1 through 4 , which depict a presently preferred embodiment of the invention . first referring to fig1 and 2 , the toy vehicle 10 is comprised generally of a body shell 12 resembling a conventional automobile , and a separate actuator 14 in the shape of a conventional key . the body shell 12 preferably has a small rear opening or key hole 16 , to a propulsion mechanism 18 ( see fig3 and 4 ), into which one end of the actuator 14 may be inserted into the body shell 12 . for child safety , importantly the key hole 16 is too small to accept a finger , thereby preventing any contact with the propulsion mechanism . the propulsion mechanism 18 preferably includes a spring 20 held captive therein , and the spring 20 is distorted upon pushing the actuator 14 into the propulsion mechanism 18 . in this embodiment , a force is loaded onto a compression spring 20 , and that stored force is used to oppose the actuator 14 and propel the body shell 12 forward , away from the actuator 14 . the actuator 14 is preferably shaped like a key , having a tip portion 22 with an &# 34 ; i &# 34 ; cross section sized to be slidably inserted into the propulsion mechanism 18 , and having an enlarged bow portion 24 to be readily grasped by the user . the forward end 31 of the tip portion 22 preferably includes a rounded bulb 33 , that fits inside the wound , helical coil of the compression spring 20 . an upper flange 34 of the tip portion 22 includes a latch member or retaining tab 26 , sized to engage a complimentary capture member or retaining slot 28 in the propulsion mechanism 18 . additionally , material is removed from the web 30 of the &# 34 ; i &# 34 ; section of the tip 22 , to form a void 32 in the proximity of the latch member or retaining tab 26 and extending into the bow portion 24 of the actuator 14 . accordingly , the actuator 14 tip portion 22 may be inserted into the propulsion mechanism 18 and the spring 20 compressed until the retaining tab 26 is engaged in the retaining slot 28 , thereby locking the actuator 14 in place against the loaded spring 20 . then , by simply deflecting the upper flange 34 of the actuator 14 such that the retaining tab 26 is disengaged from the retaining slot 28 , the opposing force of the compression spring 20 is operative to push the body shell 12 away from the actuator 14 . now referring to fig5 details of the construction of the toy vehicle 10 of the preferred embodiment of the present invention may be described . the body shell 12 includes an undercarriage or frame 40 , a propulsion housing 42 , an a pair of axles 44 each having a pair of wheels 46 . the undercarriage or frame 40 is configured to include a pair of groves 48 which support the pair of axles 44 . the frame 40 is also configured with a pair of longitudinal rails 50 , which together with the propulsion housing 42 form the propulsion mechanism 18 . the rails 50 are spaced apart to accommodate the cross - sectional width of the tip portion 22 of the actuator 14 . the overlying propulsion housing 42 has a rear opening 50 sized to accept the cross section of the actuator 14 , while retaining the compression spring 20 therein safely away from the key hole 16 . additionally , three mounting posts 52 extend vertically from the body shell 12 through the propulsion housing 42 and into the undercarriage or frame 40 , and three conventional mounting screws 54 secure the frame 40 to the mounting post 52 . as assembled the axles 44 are free to rotate with respect to the frame 40 , and / or the wheels 46 freely rotate about the axles 44 . with the exception of the compression spring 20 and mounting screws 54 being standard metal hardware , the remainder of the toy vehicle 10 is preferably fabricated of molded plastic material offering the dual advantages of low cost and lightweight . having described the structure of the toy vehicle 10 , it is now possible to describe its operation , function and use . to utilize the toy vehicle 10 , a user , most likely a child , places the body shell 12 upon a flat surface such as a table top , floor , sidewalk , or the like . with one hand , the user holds the body shell 12 , and with the other hand grasps the key - shaped actuator 14 about the bow portion 24 , and inserts the tip portion 22 into the rear opening or key hole 16 of the body shell 12 . upon pushing the tip portion 22 of the actuator 14 into the propulsion mechanism 18 , the spring 20 is compressed until the latch member or retaining tab 26 becomes engaged in the capture member or elongate slot 28 of the propulsion housing 42 . at this point , the actuator 14 is locked into the body shell 12 of the toy vehicle 10 with the spring 20 compressed . now the user merely deflects the upper flange 34 of the actuator 14 , to move the retaining tab 26 out of engagement with the retaining slot 28 . in deflecting the upper flange 34 of the actuator 14 , the user would typically grasp the actuator 14 between multiple fingers holding the top flange 34 and bottom flange 35 . alternatively , it may prove useful to rest the bottom flange or base 35 of the actuator 14 directly against the table top or other flat surface . as is apparent from fig4 importantly the propulsion mechanism 18 is configured so that the tip portion 22 of the actuator 14 is inserted a fixed distance inside the propulsion mechanism 18 , such that the forward end 31 lies approximately above the rear axle 44 . in this way when the user deflects the upper flange 34 to release the latch member or retaining tab 26 from the capture member or retaining slot 28 , the downward force is transmitted , in part , approximately vertically into the rear axle 44 and wheels 46 . the body shell 12 is propelled forward without being unduly rotated about the rear axle 44 by a downward force applied substantially aft of the rear axle 44 . additionally , the body shell 12 is propelled forward without being held back by a downward force applied substantially forward of the rear axle 44 . it is understood that the toy vehicle described herein and shown in the drawings represents only a presently preferred embodiment of the invention . indeed , various modifications and additions may be made to the embodiment shown without departing from the spirit and scope of the invention . by way of example only , the toy vehicle could be configured as an airplane or missile which is launched through the air rather than being propelled forward along a flat surface . such a modification may be obvious to those skilled in the art and may be implemented to adapt the present invention for use in a variety of different applications .
a self - propelled toy vehicle suitable to be given away as a promotional item includes a body shell , having a rear opening or key hole to an internal propulsion mechanism that contains a compression spring . the tip of a separate , key - shaped actuator is insertible into the propulsion mechanism to distort the spring . the actuator also preferably includes a latch member that engages a complimentary capture member in the propulsion mechanism . the latch member is manually disengaged , propelling the body shell forward utilizing the opposing force of the compression spring . the promotional toy is fun and safe to use , and may be manufactured inexpensively .