Abstract: Top panel height adjustable furniture (1) includes a top panel (2) that has an upper surface (3) and a lower surface (4); a support body (5) that is connected to the top panel (2) and is capable of extending or contracting in a panel thickness direction of the top panel (2); a sensor (11) that detects contact of a user on the upper surface (3) side of the top panel (2) and contact of the user on the lower surface (4) side of the top panel (2); and a control unit that controls, based on a detection result of the sensor (11), an extending/contracting operation of the support body (5) such that the support body (5) contracts when it is detected that the user has made contact with the top panel (2) on the upper surface (3) side of the top panel (2) and that the support body (5) extends when it is detected that the user has made contact with the top panel (2) on the lower surface (4) side of the top panel (2).

Abstract: The present invention relates to an alternate combustion type regenerative radiant tube burner apparatus which comprises a circular plate positioned between a burner unit and a main combustion chamber, so that preheated secondary combustion air is fed through an opening of the circular plate to the main combustion chamber. The burner apparatus has the circular plate (10), an annular air throat (2), a cylindrical peripheral cover (30) and a heat-transfer tube (11,16). A front end portion of the peripheral cover is integrally connected with a peripheral edge portion of the circular plate so as to prevent the secondary combustion air of the air throat from leaking on a periphery of the circular plate to the air diluting chamber (3). According to the present invention, the concentration of nitrogen oxides in the combustion exhaust gas can be definitely prevented from increasing, without being affected by the installation condition or thermal deformation of the radiant tube burner apparatus.