| 摘要 |
A blackboard (or whiteboard) including a rectangular board member (30) having a protective frame member (40), and a foldable tray (50) includes a modified hinge wherein the lowermost one of the frame members (40) has a front side which is formed with a longitudinally extending retaining portion (41) that confines a longitudinally extending space (42) which is L-shaped in cross-section. The tray (50) has a rear side wall (502) which is formed with a transversely and longitudinally extending rearward anchor projection (504) that is T-shaped in cross-section and that has a head portion (5041) which extends into the space (42). <IMAGE> |
