Flexible runner sled

A coaster comprising:

• a pair of longitudinally-extending and laterally-spaced flexible rails which support and define a path for the coaster along a ground surface;
• first, second, and third lateral struts extending between and connected to the flexible rails;
• a longitudinally-extending body support board;
• pivot joints between the body support board and the lateral struts, said pivot joints mounting the body support board along the flexible rails for pivotal movement of the body support board, relative to the flexible rails, about a longitudinal axis;
• gearing connected to the body support board and a rack, said rack connected to said second lateral strut to laterally displace said second lateral strut relative to at least said first and third lateral struts strut in response to pivoting the body support board relative to the flexible rails, such displacement arcing the flexible rails and thereby curving the path of the coaster.

A coaster comprising:

• a pair of longitudinally-extending and laterally-spaced flexible sled runners which support and define a path for the coaster along a ground surface;
• forward, intermediate, and rearward lateral struts extending between and connected to the flexible runners;
• the flexible sled runners extending forward from the forward lateral strut to leading rail ends;
• a longitudinally-extending body support board;
• pivot joints between the body support board and the lateral struts, said pivot joints mounting the body support board along the flexible sled runners for pivotal movement of the body support board, relative to the flexible sled runners, about a longitudinal axis;
• a steering handle operably connected to a front cross piece, which is connected to the leading rail ends, and connected to the body support board, said steering handle being turnable about a generally vertical axis to laterally displace the leading rail ends and to thereby arc the flexible sled runners;
• an additional interlinkage, separate from said steering handle, body support board and said struts, and connected to said steering handle, body support board, and at least one of the struts to pivot the body support board in response to pivoting of the steering handle about said vertical axis;
• gearing connected to the body support board and the intermediate lateral strut to laterally displace the intermediate lateral strut relative to the forward and rearward lateral struts in response to pivoting the body support board relative to the flexible sled runners, such displacement further arcing the flexible sled runners and thereby curving the path of the coaster.

A coaster comprising:

• A pair of longitudinally-extending flexible rails laterally-spaced apart by and connected to at least three struts, said struts laterally disposed so as to have two end struts and a laterally displaceable center strut, said flexible rails defining a path for the coaster along a ground surface;
• a front cross piece, said front cross piece disposed between and connected to said rails at a first end of said coaster;
• a longitudinally-extending body support board;
• pivot joints joining said struts and said support board, said pivot joints mounting the body support board along the flexible rails for pivotal movement of the body support board, relative to the flexible rails, about a longitudinal axis;
• a mechanism to displace the center strut connected to said body board and said center strut for laterally displacing said center strut in response to pivoting of said body board, thereby causing the flexible rails and said longitudinal axis to arc;
• and
• wherein each said end strut is connected to said pivot joints to allow said end struts to pivot about a vertical axis extending through each said end strut and said pivot joint to allow the flexible rails to arc, thereby causing the path of the coaster to curve.