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Splitboard boot bindings for backcountry splitboarding. Each of a pair of soft-boot bindings is provided with an integral boot binding lower that conjoins the two halves of a splitboard without the additional weight or height of an adaptor mounting plate, upper binding baseplate or “tray”, and extra

Splitboard boot bindings for backcountry splitboarding. Each of a pair of soft-boot bindings is provided with an integral boot binding lower that conjoins the two halves of a splitboard without the additional weight or height of an adaptor mounting plate, upper binding baseplate or “tray”, and extra fasteners of the prior art. The boot binding lower is formed as a box girder and provides improved torsional stiffness for splitboard riding. When subjected to a torque applied by the rider, the bottom mediolateral edges of the box girders are configured to contactingly engage the top face of the splitboard, thereby dynamically coupling the rider's boot sole and the board via a single rigid structure. In a preferred embodiment, the web or “spacer” members of the box girder are characterized by an aspect ratio or contour height that is varied from heel to toe.

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1. A pair of splitboard boot bindings, each boot binding for securing a rider's boot to a splitboard, the splitboard having a pair of conjoinable ski members, the ski members when conjoined together defining a snowboard riding configuration and when used separately defining a ski touring configurati

1. A pair of splitboard boot bindings, each boot binding for securing a rider's boot to a splitboard, the splitboard having a pair of conjoinable ski members, the ski members when conjoined together defining a snowboard riding configuration and when used separately defining a ski touring configuration, each boot binding for engaging a snowboard mounting block assembly affixed crosswise to the top face of the splitboard in snowboard riding configuration and for engaging a ski mounting assembly affixed to one of the ski members in ski touring configuration, each boot binding of said pair comprising: a) a nose bracket formed on a toe end of a boot binding baseplate, said nose bracket with transverse coaxial toe pivot holes;b) a toe pivot pin for pivotably securing said baseplate to a toe pivot cradle of said ski mounting assembly;said toe pivot pin comprisingi) a pivot axle member enabled to be inserted through said transverse toe pivot holes in said nose bracket, thereby defining a toe pivot axis;ii) an elbow bend in said toe pivot pin, said elbow bend defining a locking side arm inflexibly joined thereto;wherein said locking side arm has a laterally projecting length dimensioned so as to be strappable under a rider's toe strap against the side of a rider's boot in ski touring configuration and snowboard riding configuration, thereby preventing said toe pivot pin from being lost or loosened in use. 2. The pair of splitboard boot bindings of claim 1, wherein said toe pivot pin with locking side arm is “L-shaped” and said locking side arm is rotatable on said toe pivot axis with said pivot axle member. 3. The pair of splitboard boot bindings of claim 1, wherein said locking side arm is configured with a double elbow. 4. The pair of splitboard boot bindings of claim 1, wherein said toe pivot pin is (a) a universal toe pivot pin for either foot or (b) a specific toe pivot pin for a specific foot. 5. A method for promoting splitboarding, which comprises: a) supplying a pair of splitboard mounting block assemblies to a rider, each said pair of mounting block assemblies comprising a pair of elastically deformable solid members having external flanged edges contralaterally disposed thereon;b) fastening said splitboard mounting block assemblies to a top face of a splitboard such that one pair of elastically deformable solid members is positioned for each foot of a rider;c) supplying a pair of boot bindings to a rider, each boot binding of said pair comprising a box girder having: i) a top platform enabled to receive torque applied footwise by a rider standing thereon;ii) a bottom surface joined to said top platform by medial and lateral web elements, said web elements defining an underside channel therebetween, said underside channel having parallel inside flanged edges enabled to conjoiningly interlock said external flanged edges of said one pair of elastically deformable solid members when slideably engaged thereon; further wherein a bilateral clearance (C1) is defined between said bottom surface and said top face of said splitboard when slideably engaging said boot bindings thereon; and,d) performing a foot roll while riding said splitboard, said foot roll having the steps of: i) applying a first bending force to said splitboard by using said box girder as a lever arm to form a first fulcrum, wherein said first fulcrum is defined by dynamic contact between a first mediolateral edge of said bottom surface with said top face of said splitboard;ii) applying a second bending force to said splitboard, said second bending force having an opposing direction to said first bending force by using said box girder as a lever arm to form a second fulcrum, wherein said second fulcrum is defined by dynamic contact between a second mediolateral edge of said bottom surface with said top face of said splitboard; and,further wherein upon dynamically contacting said box girder to said splitboard through said first fulcrum or said second fulcrum, said box girder and said splitboard are mechanically coupled with a torsional stiffness coefficient (K) of greater than 150 in-lb/degree, thereby enabling a foot roll. 6. The method for promoting splitboarding of claim 5, wherein said box girder, said splitboard, and said elastically deformable solid members define a mechanical linkage having a torsional stiffness coefficient (K) in the range of 150 to 300 in-lb/degree whenever said box girder is dynamically contacted to said splitboard through said first fulcrum or said second fulcrum. 7. The method for promoting splitboarding of claim 6, further comprising a step for using an opposing spring force dynamically coupled through said mechanical linkage to spring to an upright position after bottoming out a tail of the splitboard during a ride.