| 摘要 |
A building element for a set of toy building blocks that are capable of being interconnected in a releasable engagement includes a box with side walls, a top having one or more projections, and an open bottom providing access to interior surfaces for frictional engagement with the top projection(s). The side walls includes a plurality of grooves having entry openings of a given predominant width and a plurality of tongues having distal portions of a predominant width that is greater than the given predominant width of the groove entry openings for interconnecting in a releasable restraining engagement with grooves in another such building element. The tongues are flexible and split longitudinally into sections so that the tongues can be compressed laterally in order to effect the restraining engagement by frontally pressing the tongues into the grooves. The tongues can also be disengaged from the grooves by sliding the tongues from one end of the grooves. The side walls have a primary surface that includes recesses adjacent the tongue sections so that the tongue sections extend outward from below the primary surface. Adjacent each entry opening the groove is defined by a first side-wall portion that is inclined outward at an entry angle and a second side-wall second portion that is inclined inward at a restraining angle that is less than the entry angle in relation to a virtual broad surface of the side wall so that less force is required to effect engagement than is required to effect disengagement.
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