Abstract: The discussion unit (10) for use in a conference system is disclosed, which is adapted to be connected to at least one second discussion unit (10). The discussion unit (10) comprises an essentially closed casing (410) and at least one exchangeable portion (420). The at least one exchangeable portion (420) is removably mounted to the casing (410) and at least partially covers at least one outside part (424, 412) of the casing (410). The invention allows for an easy first installation of the exchangeable portion (420). Nevertheless, after installation, the exchangeable portion (420) is difficult to remove by a user (preventing unintended removal or removal by vandalism or “play instinct”), but allowing for an easy exchange of the exchangeable portion (420) by an installer and/or a service technician.

Abstract: A discussion unit (6) for use in a conference system (8) is disclosed, which is adapted to be connected to at least one second discussion unit (6) of the conference system (8). The discussion unit (6) is switchable between at least two operating modes. The discussion unit (6) further comprises at least one exchangeable control (420) out of a set of controls comprising at least one control for each of the operating modes, wherein the at least one exchangeable control (420) is adapted to indicate to a user the operating mode currently used and to allow for the user to control the discussion unit (6).

Abstract: A discussion unit (6) for use in a conference system (8) is disclosed, which is adapted to be connected to at least one second discussion unit (6) of the conference system (8). The discussion unit (6) is switchable between at least two operating modes. The discussion unit (6) further comprises at least one exchangeable control (420) out of a set of controls comprising at least one control for each of the operating modes, wherein the at least one exchangeable control (420) is adapted to indicate to a user the operating mode currently used and to allow for the user to control the discussion unit (6).

Abstract: Summary The discussion unit (10) for use in a conference system is disclosed, which is adapted to be connected to at least one second discussion unit (10). The discussion unit (10) comprises an essentially closed casing (410) and at least one exchangeable portion (420). The at least one exchangeable portion (420) is removably mounted to the casing (410) and at least partially covers at least one outside part (424, 412) of the casing (410). The invention allows for an easy first installation of the exchangeable portion (420). Nevertheless, after installation, the exchangeable portion (420) is difficult to remove by a user (preventing unintended removal or removal by vandalism or “play instinct”), but allowing for an easy exchange of the exchangeable portion (420) by an installer and/or a service technician.

Abstract: For designing a balanced stair comprising steps with treads (1-15) showing front edges (26), a line of travel (22) is determined on the stair and a reference line is determined onto each step in a predetermined position with respect to the front edge (26) thereof. In contrast to the prior art methods wherein the reference lines, more particularly the front edges (26) or the risers (25) of the steps, are divided along the line of travel (22) on constant mutual distances measured on the line of travel itself, the substantially constant mutual distances (d) between the reference lines is determined according to the invention near the line of travel (22) along a measuring line (27) which is determined for each pair of adjoining reference lines so as to form a substantially constant angle (?) with at least one of the adjoining reference lines thereof. In this way, a stair which is easier to walk on and which automatically shows a more regular nosing line at the outer string (21) is obtained FIG. 8.

Abstract: For designing a balanced stair comprising steps with treads (1-15) showing front edges (26), a line of travel (22) is determined on the stair and a reference line is determined onto each step in a predetermined position with respect to the front edge (26) thereof. In contrast to the prior art methods wherein the reference lines, more particularly the front edges (26) or the risers (25) of the steps, are divided along the line of travel (22) on constant mutual distances measured on the line of travel itself, the substantially constant mutual distances (d) between the reference lines is determined according to the invention near the line of travel (22) along a measuring line (27) which is determined for each pair of adjoining reference lines so as to form a substantially constant angle (&agr;) with at least one of the adjoining reference lines thereof.