Referring to
The base members 2 each have two vertical axle holes 22 and 22A and two upright locating blocks 21 and 21A.
The master racks 1 and 1A are respectively formed of rectangular frame tubes. Further, the master racks 1 and 1A each comprise two bottom shanks 13 and two bottom mounting holes (not shown) corresponding to the vertical axle holes 22 and 22A and upright locating blocks 21 and 21A of the base members 2, a plurality of upright columns 11, each upright column 11 having a vertical coupling hole 111 vertically extending out of the topmost edge and a plurality of horizontal locating holes 112 respectively disposed in communication with the vertical coupling hole 111 at different elevations, a first top pivot axle 12 and a second top pivot axle 122, and a lock screw 15 at the top. By means of inserting the bottom shanks 13 of the master racks 1 and 1A into the vertical axle holes 22 and 22A of the base members 2 to force the upright locating blocks 21 and 21A of the base members 2 into the bottom mounting holes of the master racks 1 and 1A, the master racks 1 and 1A and the base members 2 are firmly secured together.
The two links 14 are yoke members detachably coupled between the two master racks 1 and 1A, each having two pivot holes 141 and 142 respectively coupled to the first top pivot axles 12 and second top pivot axles 122 of the two master racks 1 and 1A. The two links 14 each further have a mouthpiece 143. When the detachable starter box is detached, the mouthpiece 143 of the links 14 can be respectively attached to the lock screws 15 of the two master racks 1 and 1A and respectively locked to the master racks 1 and 1A by the lock screws 15.
The four track assemblies 3 are identical and arranged in two sets respectively detachably mounted on the two master racks 1 and 1A at the front and rear sides, each comprising a horizontal plate member 31, a longitudinal sliding track 32 fixedly provided at the top side of the horizontal plate member 31 and extending in longitudinal direction corresponding to the length of the master racks 1 and 1A, and a plurality of vertical mounting rods 33 perpendicularly downwardly extending from the bottom side of the horizontal plate member 31 and respectively insertable into the vertical coupling hole 111 of the upright columns 11 of the two master racks 1 and 1A. The horizontal plate member 31 of each track assembly 3 has a pivot hole 34. The vertical mounting rods 33 each having a plurality of vertically spaced mounting screw holes 331 selectively fastened to the horizontal locating holes 112 of the upright columns 11 of the two master racks 1 and 1A with screws to secure the respective track assemblies 3 to the master racks 1 and 1A at the desired elevation.
The two carriages 4 respectively adjustably coupled to the track assemblies 3 above the master racks 1 and 1A, each comprising a longitudinally extending bottom plate 41 and a transversely extending top plate 44. The bottom plate 41 has a longitudinal sliding groove 411, and a transversely extending pivot hole 412. A transverse shaft 42 is inserted through the pivot hole 412 of the bottom plate 41. The transverse shaft 42 has a polygonal coupling rod 421 at each of the two distal ends to hold a respective mounting block 43. The mounting block 43 has a polygonal coupling hole 431 coupled to one polygonal coupling rod 421, a bottom axle 433 inserted into the pivot hole 34 of the horizontal plate member 31 of one track assembly 3, a bottom stop member 434 stopped at a part of the horizontal plate member 31 of the associating track assembly 3, and a longitudinal sliding rail 432. Thus, the bottom plate 41 is turnable about the associating transverse shaft 42. The top plate 44 is coupled to bottom plate 41 and movable along the longitudinal sliding groove 411, having two transverse sliding slots 441 aligned in a line near the two distal ends, two dual-cone type retaining members 45 respectively coupled to the transverse sliding slots 441 for securing a remote-control toy car to the respective carriage 4, and two bottom guide rods 442 respectively coupled to the longitudinal sliding tracks 32 of the associating two track assemblies 3. The two dual-cone type retaining members 45 each have two fixed cones arranged in parallel and a polygonal bottom coupling rod downwardly extending from one cone and respectively coupled to the respective transverse sliding slots 441. The dual-cone type retaining members 45 can be moved along the respective transverse sliding slots 441 to adjust the pitch subject to the width of the remote-control toy car to be started. Further, the dual-cone type retaining members 45 can be respectively rotated relative to the top plate 44 to the desired angle for securing the loaded remote-control toy car firmly in place.
When not in use, the two master racks 1 and 1A are respectively disconnected from the vertical axle holes 22 and 22A and upright locating blocks 21 and 21A of the base members 2, and then the two carriages 4 are turned in reversed directions to disengage the respective bottom guide rods 442 from the longitudinal sliding tracks 32 of the associating two track assemblies 3 for enabling the two master racks 1 and 1A to be moved toward each other and closely attached together, and then the lock screws 15 are fastened tight to lock the links 14, keeping the two master racks 1 and 1A closely attached together (see
Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.