Patent ID: 8932094
Filing Date: 2015-01-13
Classification: B63B

Abstract:
1. A stringer for use in a board comprising an internal core and an outer skin, the stringer comprising: a first compressible side member adjacent the outer skin on a first side of the board; a second compressible side member adjacent the outer skin on a second opposite side of the board; and a central member extending longitudinally through the board dividing the internal core into portions located on lateral sides of the central member, the central member extending from a location adjacent the first side member to a location adjacent the second side member, the first and second side members being relatively flexible in relation to the central member; wherein longitudinal flexing of the board results in compression of the first and second side members by the central member such that, as the amount of flexing increases, forces due to said flexing transferred through the first and second side members from the outer skin to the central member increase, thereby increasing the stiffness of the board relative to the stiffness of the board in an unflexed state.