| 摘要 |
<p>A reusable martial arts board (1) comprises two interconnecting and symmetrical half-sections (2, 3). Along the interconnecting edge of each section a plurality of alternating projections (18) and cavities (19) are shaped and dimensioned to intimately engage a matching row of similar projections and cavities on the opposite board. Each cavity has a slot (23) in its lower section, and each projection has a corresponding radial groove (20). When a load is applied at the junction of the board being held at opposite ends, the slots expand while the grooves constrict to facilitate the separation of each extension from its nesting cavity.</p> |
