Abstract: A metal/air button cell includes a cell cup having at least one inlet opening via which atmospheric oxygen can enter the interior, the cell cup has an inner side facing the interior, and an oppositely directed outer side, an air cathode is in the form of a cathode disk with a circumferential cathode disk periphery, the air cathode includes a metal collector structure, the cathode disk is arranged such that the cathode disk periphery bears along a circumferential contact zone against the inner side of a cladding region, the cell cup has, on its outer side, at least one recess made by impression and becomes visible as a raised portion on the inner side, and the at least one recess is made in the outer side such that the raised portion exerts a pressure against the cathode disk periphery in the region of the contact zone.

Abstract: A metal/air button cell includes a cell cup having at least one inlet opening via which atmospheric oxygen can enter the interior, the cell cup has an inner side facing the interior, and an oppositely directed outer side, an air cathode is in the form of a cathode disk with a circumferential cathode disk periphery, the air cathode includes a metal collector structure, the cathode disk is arranged such that the cathode disk periphery bears along a circumferential contact zone against the inner side of a cladding region, the cell cup has, on its outer side, at least one recess made by impression and becomes visible as a raised portion on the inner side, and the at least one recess is made in the outer side such that the raised portion exerts a pressure against the cathode disk periphery in the region of the contact zone.

Abstract: Gear drive (1), for example, a planetary gear drive, having a housing (2) and at least one shaft (4), for example, an output shaft leading through the housing wall (3) toward the outside. For equalization of pressure, a pressure-equalization chamber (5) is positioned in the interior of the shaft (4) and/or a drive part (6) associated therewith and is connected, on the one hand, with the interior of gear drive (1) and, on the other hand, with the external atmosphere, for example, via a borehole (11) running through shaft (4) so that the shaft (4), which has to pass through the housing (2) of the gear drive (1), is employed in equalization of pressure. Located in the pressure-equalization chamber (5) is a membrane (7) that is deformable via pressure differentials. The membrane separates and seals the external atmosphere and the interior of the gear drive from each other.