fig1 shows a conventional skateboard ( 1 ) with a skateboard truck ( 3 b ) mounted to the skateboard deck ( 2 ) in the rear position by conventional means of a riser ( 4 ) and a truck ( 3 a ) mounted to the deck in the forward position by means of the present invention skateboard truck system ( 5 a ). although not shown on the figures , the skateboard deck ( 2 ) has a set of four conventional boltholes at both the forward and aft positions for attachment of the trucks . the conventional riser ( 4 ) is typically a rectangular shaped unit , which is not shown on the figure but has four boltholes on each corner to match with bolt holes ( 31 ) of the truck ( 3 b ). the conventional design aft truck ( 3 b ) is mounted on the skateboard deck with four flat headed bolts down through the top side of the deck , sandwiching a riser ( 4 ) between the deck and the truck ( 3 b ), and using four nuts on the extended end of the bolts at the bottom side of the truck ( 3 b ). as shown on fig2 , each truck also has 4 boltholes ( 31 ), one each at the four corners of the base plate ( 30 ), and axle ( 32 ) to mount the wheels , which is supported on the base plate unit ( 30 ) with the device which allows the axle ( 32 ) to freely change angle with respect to the deck ( 2 ). the skateboard truck mounting system ( 5 a ), as shown on fig2 to 4 , comprises a base unit ( 6 a ) which is mounted on the bottom side of the skateboard deck ( 2 ) at the pre determined and predrilled position and an adjustable sliding unit ( 7 a ) upon which a conventional skateboard truck ( 3 a ) will be mounted and the locking device ( 73 ) to secure the adjustable sliding unit ( 7 a ) in the selectable position . as shown on fig5 , one side of the base unit ( 6 a ) is grooved in the middle section from the one end toward the other end along approximately 75 % of its length , and at the bottom of the groove ( 61 ), parallel and narrow even pitched grooves oriented perpendicular to the long axis of the middle section are included to secure the locking device to lock the adjustable sliding unit ( 7 a ) at a desired position . although a smaller pitch of the locking groove ( 62 ) is preferable , it is commonly set at approximately 5 mm pitch for the application . the base unit ( 6 a ) also has four boltholes ( 63 ) to match with the conventional pre - drilled holes ( 23 ) on the typical skateboard deck . in addition , at the both side edges of the base unit ( 6 a ), an l shape tongue and groove ( 64 ) is cut to accept the adjustable sliding unit ( 7 a ). when the base unit ( 6 a ) is set on the deck ( 2 ), this l shape tongue and groove ( 64 ) makes the adjustable sliding unit both easily movable , and fixable with the adjustable sliding unit ( 7 a ) which has a locking clip ( 71 c ). an adjustable sliding unit upon which a conventional skateboard truck can be mounted ( 7 a ), as shown on fig2 – 4 and 6 , comprises a main body base ( 71 ) and four mounting bolts ( 72 ). the main body ( 71 ) is typically made of steel , and further comprises a cover ( 71 a ) which is the same width or slightly wider than the main body base ( 71 ), the sidings ( 71 b ) which are the end width of the cover ( 71 a ) and are angled upwards at 90 degrees , and the catch / tongue locking clip ( 71 c ) which can be fit into the groove ( 64 ) of the base unit ( 6 a ) to facilitate the sliding . the mounting bolts ( 72 ) which have same span of the boltholes ( 31 ) are welded vertically onto the top surface of the cover ( 71 a ). the metal portion ( 73 ) and the spring plate ( 74 ), which are the parts of the locking device , are fixed at the inner side of the cover ( 71 a ). the locking device ( 73 ), as shown on fig4 and 7 , comprises at one end the stopper groove ( 73 a ) to accept the stopper protuberance ( 71 d ), at the other end , a lever ( 73 b ) which is bent to a certain angle , and a nail like stopper tongue ( 73 c ) which is bent to the opposite side from a lever ( 73 b ) at the base of the lever . the spring plate ( 74 ), as shown on fig4 and 8 , is formed with two angles as seen in fig8 , and has a stopper protuberance at one end . to set up the skateboard mounting system ( 5 a ), the rider sets the convex side of the spring plate ( 74 ) to face the cover unit ( 71 a ), then attach the stopper protuberance ( 71 d ) of the spring plate ( 74 ) to the stopper groove ( 74 a ); connects the locking device ( 73 ) to the stopper protuberance ( 71 d ), facing lever ( 73 b ) side towards the spring plate ( 74 ); then while keeping this set up , inserts the nail like locking clip ( 71 c ) of the main body ( 71 ) to the groove ( 64 ) of the base unit ( 6 a ) from the open end of the groove ( 61 ), sliding the lever ( 73 b ) into the proper position while maintaining the spring plate &# 39 ; s ( 74 ) pressure against the cover unit ( 71 a ); then while releasing the lever ( 73 b ) from the locking position , connects the stopper tongue ( 73 c ) into the locking groove ( 62 ). the total thickness of the base unit ( 6 a ) and the cover unit ( 71 a ) together is designed to be equal to the thickness of a conventional skateboard truck riser ( 4 ). to install the front truck ( 3 a ), onto the truck mounting system , the rider places the truck mounting system ( 5 a ) on to the bottom side of the skateboard deck ( 2 ); while matching the predrilled 4 bolt holes ( 63 ) on the base unit ( 6 a ) with the 4 bolt holes of the skateboard deck ( 2 ), screws down the bolts ( 11 ) into the screw holes ( 63 ) to fixate the base unit ( 6 a ) on to the skateboard deck ( 2 ). the rider then inserts the bolts ( 72 ) welded on to the main body unit ( 71 ) into the boltholes ( 31 ) of the truck ( 3 a ), and screws down the nut ( 75 ) to secure the main body unit ( 71 ) and the truck ( 3 a ). on a skateboard ( 1 ) as described above , front truck ( 3 a ) is attached on to the skateboard deck ( 2 ) via the truck mounting system ( 5 a ). therefore , if the lever ( 73 b ) was pulled toward to the truck ( 3 a ) and force is applied to either forward and aft of the skateboard deck ( 2 ) while releasing the stopper tongue ( 73 c ) from the locking groove ( 62 ), the truck ( 3 a ) would slide to the direction of the given force . then , after the truck ( 3 a ) is slid to the desired selected position , when the lever ( 73 b ) is released , the lever ( 73 b ) is pressed to the base unit ( 6 a ) by the force of the spring plate ( 74 ), and the locking device ( 73 ) latches on to the locking groove ( 62 ) to fixate the truck ( 3 a ) at the selected position . on a skateboard ( 1 ), the position of the front truck ( 3 a ) can be adjusted just with the ease of the touch of the lever . without dismounting the truck ( 3 a ), the wheel base can be freely adjusted in small increments , and a single skateboard can offer the most comfortable , suitable and safe ride regardless of the experience , height and weight of the users . in addition , above - mentioned skateboard truck mounting system ( 5 a ) can be used on any conventional skateboard , therefore if one who owns the conventional skateboard purchases the truck mounting system ( 5 a ), he or she too can convert the conventional skateboard into a skateboard incorporating this invention . fig9 shows a second embodiment of the truck mounting system . as shown on fig9 , this embodiment is similar to the above mentioned truck mounting system ( 5 a ) except that this truck mounting system ( 5 b ) has a main body ( 76 ), a plate like lever ( 76 b ) and one end of the plate like lever is fixed to the bottom side surface of the main body unit ( 76 ) using nut ( 76 a ). the other end of the plate like lever ( 76 c ) protrudes through an annular guide ( 76 d ) and to the side surface of main body ( 76 ). although not shown on the figure , the plate like lever ( 76 b ) has a stopper protrusion , which protrudes to the base ( 6 b ) through the cover unit ( 76 e ), designed to be locked in to the stopper groove ( 66 ). fig1 shows a third embodiment of the truck mounting system of this invention . as shown on fig1 , the components are the same as the above mentioned truck mounting system ( 5 a ) except that this truck mounting system ( 5 c ) has numerous incremental screw holes ( 67 ) on the base plate ( 6 c ) designed to accept screws ( 77 ) through two pre drilled holes , forward and aft part of the main body unit ( 7 c ) ( not shown on fig1 ) to slide and lock the main body unit ( 7 c ) into the selected position . although the above - mentioned embodiments describe mounting only the forward truck via the truck mounting system , it can be used for both forward and aft trucks on the same deck . additionally , the base unit of system can be extended to the entire length of the skateboard deck to be shared with both forward and aft trucks , so the both trucks can be freely slide into any position throughout the length of the skateboard deck . in yet another embodiment , the base unit of truck mounting system can be molded or otherwise integrally fabricated into the skateboard deck as one unit . the conventional trucks would then slidably engage the base unit by way of a sliding member .
the skateboard truck mounting system is a mounting system for the attachment of a skateboard wheel truck to the deck of a skateboard . this system provides quick and easy adjustment to incrementally reposition a skateboard wheel truck assembly in a number of predetermined locations along the length of underside of the skateboard deck . this system may be utilized on new or existing decks to achieve personalized sizing and performance characteristics for a skateboard rider .