during the course of this description like numbers will be used to identify like elements according to the different drawings that illustrate the invention . fig1 illustrates a typical model race car track according to the preferred embodiment of the invention ( 10 ) wherein a first model car ( 14 ) and a second model car ( 16 ) may be simultaneously launched by a launcher ( 12 ). model cars ( 14 , 16 ), supported by wheels ( 22 ), are guided respectively by wires ( 18 , 20 ) which are anchored at one end by launcher ( 12 ) and the other end by a stop block ( 84 ). model cars ( 14 , 16 ) are respectively propelled by co2 cartridges ( 24 , 26 ) which are simultaneously punctured by moving trigger plate ( 46 ) sidewise in a manner described below . the launcher ( 12 ) is shown in a front perspective view in fig2 . fig3 a , 3 b , 3 c , 3 d , and 3 e also show the launcher ( 12 ) from the front , from the left side , from the right side , from the rear , and from a top plan view . the major features of launcher ( 12 ) are a relatively flat launcher base plate ( 28 ), a first and a second tower ( 30 , 32 ), a first and a second launch module ( 34 , 36 ) attached respectively to towers ( 30 , 32 ), and a trigger plate ( 46 ) supported by a first and a second support means ( 70 a , 70 b ). towers ( 30 , 32 ) each have a first and a second adjustment fin ( 38 a , 38 b ). each of the fins ( 38 a , 38 b ) include , respectively , a first bead ( 40 a ) and a second bead ( 40 b ) along the edges thereof . launch modules ( 34 , 36 ) each include a first and a second groove ( 42 a , 42 b ) which terminate at a first and a second enlarged opening ( 44 a , 44 b ). the first fin ( 38 a ) with its corresponding bead ( 40 a ) is received in the first groove ( 42 a ) so that the bead ( 40 a ) is held by the first enlarged opening ( 44 a ). similarly , the second fin ( 38 b ), with its corresponding beaded edge ( 40 b ), is received in the second groove ( 42 b ) with its enlarged opening ( 44 b ) accepting the bead portion ( 40 b ). beads ( 40 a , 40 b ) are secured by the enlarged openings ( 44 a , 44 b ) so that the launch modules ( 34 , 36 ) do not disengage from the fins ( 38 a , 38 b ). the important and unique aspect of this arrangement is that it permits the launch modules ( 34 , 36 ) to move up and down , vertically , along the height of the towers ( 30 , 32 ) so that the launch modules ( 34 , 36 ) can be paired up with cars ( 14 , 16 ) in which the wheels ( 22 ) may be of different heights or , wherein the location of the co2 cartridge ( 24 , 26 ) is at a different height from car to car . the engagement is a friction fit and the height adjustment is made simply by pulling up or pushing down on the appropriate launch module ( 34 , 36 ). fig4 a is a side cross - sectional view of an individual launch module ( 34 , 36 ) showing the firing pin mechanism ( 48 ) in the post launch position immediately prior to cocking . fig4 b - 4g illustrate the steps necessary to cock and then release the firing pin mechanism ( 48 ). the firing pin mechanism ( 48 ) is housed within a cavity ( 62 ) of each of the launch modules ( 34 , 36 ). it comprises a rod ( 50 ) having a sharp point ( 52 ) at a first end of the rod ( 50 ) and a pull knob ( 54 ) located at the second end of the rod ( 50 ) distal from the sharp point ( 52 ). a disc ( 56 ) is located on rod ( 50 ) intermediate the pull knob ( 54 ) and the sharp point ( 52 ). disc ( 56 ) has a long side , or big radius ( 60 ) and a short side , or small radius ( 58 ). the term “ long ” is used to indicate that the radius of the disk ( 56 ) is greater from the rod ( 50 ) to the long side ( 60 ) than it is to the short side ( 58 ). the interior cavity ( 62 ) inside of launch modules ( 34 , 36 ) includes a return spring ( 64 ) that biases the firing pin rod ( 50 ) towards the forward position . the trigger plate ( 46 ) is received at each end thereof in vertical grooves ( 72 a , 72 b ) located in the first and second trigger support means ( 70 a , 70 b ). vertical grooves ( 72 a , 72 b ) face each other and include just enough depth in them so that the trigger plate ( 46 ) can be moved sideways from a first pre - launch ( 74 ) to a second post - launch ( 76 ) position without slipping out of the grooves ( 72 a , 72 b ). trigger plate ( 46 ) includes a handle grip hole ( 68 ) which permits the user to readily grab onto the trigger plate ( 46 ) so that the trigger plate ( 46 ) can be moved from side to side . trigger plate ( 46 ) also includes a first and a second slot ( 66 a , 66 b ) that permits the rod portions ( 50 ) of the firing pin mechanism ( 48 ) of each of the launch modules ( 34 , 36 ) to pass there through . fig4 a and 4g show the launcher ( 12 ) in the fired , or discharged , or post - launch , position ( 76 ). fig4 b - 4f illustrate the steps necessary for cocking and simultaneously triggering the launch of model vehicles ( 14 , 16 ). the first step in the cocking process , as shown in fig3 , is to begin to pull the knob ( 54 ) backwards against the bias of spring ( 64 ) as shown in fig4 b . in the next step , as shown in fig4 c , the knob ( 54 ) is rotated so that the disc ( 56 ) can pass through slots ( 66 a or 66 b ) of trigger plate ( 46 ). according to the next step , as shown in fig4 d , the knob ( 54 ) is further rotated so that the long , or big radius , side ( 60 ) of the disc ( 56 ) is directly opposing a land portion of trigger plate ( 46 ). in the next step , as show in fig4 e , pressure on the knob ( 54 ) is relaxed so that the long , or big radius , side ( 60 ) of the disc ( 56 ) contacts land on the trigger plate ( 46 ). in this position the firing pin rod ( 50 ) is held in the pre - launch mode ( 74 ) by the pressure of the disc ( 56 ) on the trigger plate ( 46 ). the pre - launch steps as shown in fig4 b - 4e are repeated as many times as necessary to set up whatever number of model cars ( 14 , 16 ) are being raced . the next , and final step , shown in fig4 f is to move the trigger plate ( 46 ) sidewise so that the discs ( 56 ) slip through the respective slots ( 66 a , 66 b ) of the trigger plate ( 46 ). the current invention ( 10 ) permits both firing pin mechanisms ( 48 ) to be released substantially simultaneously thereby ensuring a fair start to the race and minimizing the effects of the launch on the ultimate performance of the model vehicle ( 14 , 16 ). this is very important because the winner of the race should be determined by the skill of the model car maker rather than by the unpredictability of the launch mechanism ( 12 ). according to fig4 f the trigger plate ( 46 ) is shown moving from its pre - launch position ( 74 ) towards its fired or disengaged position ( 76 ). lastly , as shown in fig4 g , the sharp point ( 52 ) of the firing pin rod ( 50 ) punctures the frangible nozzle end of a co2 cartridge ( 24 , 26 ) thereby respectively propelling model cars ( 14 , 16 ) down guides wires ( 18 , 20 ) towards stop block ( 84 ). as previously discussed , the height of the launch modules ( 34 , 36 ) can be adjusted . prior to launch and firing , it is desirable to adjust the launch modules ( 34 , 36 ). for example , fig5 a illustrates a launch module ( 34 , 36 ) mounted on a tower ( 30 , 32 ) and shown in a low position to accommodate a model car ( 14 , 16 ) which is low to the ground . conversely , fig5 b illustrates a launch module ( 34 , 36 ) of fig5 a moved to a higher position in order to launch a taller model vehicle ( 14 , 16 ) which is higher off the ground . this further ensures the fairness of the race by eliminating any bias that the launch mechanism might have towards taller or shorter vehicles . another unique embodiment of the invention ( 10 ), shown in fig6 , is that it is possible to gang , or couple , several launchers ( 12 ) together so that four ( 4 ) or more model race cars ( 14 , 16 ) might be launched simultaneously . to accomplish this , each base plate ( 28 ) includes engaging elements ( 86 ) along its edge so that the base plates ( 28 ) do not slip pass each other and are perfectly aligned . a dog bone shaped clip ( 80 ), which normally sits in a cavity ( 82 ) in the launcher base plate ( 28 ), includes grooves that couple a pair of trigger plates ( 46 ) to each other . accordingly , the base plates ( 28 ) are perfectly aligned and the trigger plates ( 46 ), in addition to being perfectly aligned , are also rigidly connected to each other , so that actuation of one trigger plate ( 46 ) will actuate two or more trigger plates ( 46 ) simultaneously thereby launching more than two vehicles ( 14 , 16 ) at the same precise moment . the preferred embodiment of the invention ( 10 , 12 ) has been described with regard to model race cars ( 14 , 16 ) but it is possible to propel other vehicles in a similar manner . fig7 a illustrates an alternative embodiment of the invention where the vehicles comprise a pair of co2 propelled model boats ( 90 ). fig7 b illustrates another alternative embodiment of the invention where the vehicles comprise a pair of co2 propelled model rockets ( 92 ). the present invention has a number of advantages over prior art efforts to achieve similar results . first , and foremost , the basic launcher ( 12 ) is relatively inexpensive and safe to use . the use of a sliding trigger plate ( 46 ) and a virtually fool - proof firing mechanism ( 48 ) ensures that two or more model cars ( 14 , 16 ) can be launched simultaneously thereby leaving the results of the race primarily to the skill of the model car builder rather than to any other factor . being able to adjust the firing mechanism ( 48 ) vertically further increases the fairness of the competition so as to eliminate any bias towards taller or shorter vehicles . lastly , the invention &# 39 ; s unique ability to gang , or connect , launchers ( 12 ) together in such a way that the base plates are perfectly aligned and the trigger mechanisms are rigidly connected together further ensures that more than two model vehicles ( 14 , 16 ) can be launched fairly and safely simultaneously . while the invention has been described with reference to the preferred embodiment thereof it will be appreciated by those of ordinary skill in the art that modifications can be made to the parts of the basic invention and the basic concept without department from the scope and spirit of the invention as a whole .
a co2 gas - propelled model car launcher permits two or more model vehicles to be launched substantially simultaneously . launching of the vehicles is achieved by moving a trigger plate sidewise which disengages a disc and thereby releases a firing pin whose forward movement punctures the co2 cartridge . a height adjustment feature permits the launcher to accommodate model cars of different sizes . multiple launchers may be ganged together and their trigger plates rigidly connected in such a way that sidewise movement of one trigger plate launches all of the model vehicles .