摘要:
The invention under scrutiny focuses on a white board eraser (1), which comprises a central core (2) and a stack of eraser sheets (3) arranged together with the central core (2). The central core (2) has been made into the shape of a rectangular piece, which has two ends (2p1, 2p2) and four sides (2s1-2s4). The surface area of the ends (2p1, 2p2) does not in principle exceed that of the sides (2s1-2s2). The central core (2) of the white board eraser (1) has been made into a boxlike structure. The said stack of eraser sheets (3) has been wrapped round the central core (2) covering at least three of the sides (2s1-2s4).
摘要:
The invention under scrutiny focuses on a white board eraser (1), which comprises a central core (2) and a stack of eraser sheets (3) arranged together with the central core (2). The central core (2) has been made into the shape of a rectangular piece, which has two ends (2p1, 2p2) and four sides (2s1-2s4). The surface area of the ends (2p1, 2p2) does not in principle exceed that of the sides (2s1-2s2). The central core (2) of the white board eraser (1) has been made into a boxlike structure. The said stack of eraser sheets (3) has been wrapped round the central core (2) covering at least three of the sides (2s1-2s4).
摘要:
Device for display and possible collection of sheet-shaped information carriers The device comprises firstly a bottom plate (10) prodded with a display aperture (20) intended to be positioned on e.g. the picturepane of an overhead projector, and secondly on two opposite sides of the display aperture (20) two ring mechanisms (20, 24) for retaining the informatin carriers, which preferably have double perforations along two opposite edges. Preferably, the ring mechanisms (22, 24) are coupled together with a transfer device (34, 38, 40) adapted to be actuated by means of an operating handle (48) for alternately opening and closing the two ring mechanism (22, 24). If desired, the bottom part (10) is provided in conventional manner with back parts (16, 18) and binder covers (12, 14) in order at the same time to constitute a collection binder for the inserted sheet-shaped information carriers.
摘要:
Device for display and possible collection of sheet-shaped information carriers The device comprises firstly a bottom plate (10) prodded with a display aperture (20) intended to be positioned on e.g. the picturepane of an overhead projector, and secondly on two opposite sides of the display aperture (20) two ring mechanisms (20, 24) for retaining the informatin carriers, which preferably have double perforations along two opposite edges. Preferably, the ring mechanisms (22, 24) are coupled together with a transfer device (34, 38, 40) adapted to be actuated by means of an operating handle (48) for alternately opening and closing the two ring mechanism (22, 24). If desired, the bottom part (10) is provided in conventional manner with back parts (16, 18) and binder covers (12, 14) in order at the same time to constitute a collection binder for the inserted sheet-shaped information carriers.