Abstract: A handheld work apparatus has a fuel supply system and a pump for delivering fuel from the fuel supply system. The pump has an elastic pump bellows which can be actuated by the operator. The pump bellows has a fastening section at which the pump bellows is fastened to a housing. The pump bellows has a main section and a roof section, wherein the roof section has a dome-shaped section adjoining the main section and a cap which adjoins the dome-shaped section and closes off the dome-shaped section. In order to achieve a rapid return of the pump bellows from the actuated position into the unactuated position, even at low temperatures, it is provided that the smallest wall thickness (g) of the main section is at least 10% greater than the smallest wall thickness (h) of the dome-shaped section.

Abstract: A handheld work apparatus has a fuel supply system and a pump for delivering fuel from the fuel supply system. The pump has an elastic pump bellows which can be actuated by the operator. The pump bellows has a fastening section at which the pump bellows is fastened to a housing. The pump bellows has a main section and a roof section, wherein the roof section has a dome-shaped section adjoining the main section and a cap which adjoins the dome-shaped section and closes off the dome-shaped section. In order to achieve a rapid return of the pump bellows from the actuated position into the unactuated position, even at low temperatures, it is provided that the smallest wall thickness (g) of the main section is at least 10% greater than the smallest wall thickness (h) of the dome-shaped section.

Abstract: An internal combustion engine has a cylinder (2) and a crankcase (4). A combustion chamber (3) is formed in the cylinder (2) and is delimited by a piston (5). The piston (5) rotationally drives a crankshaft (7) in a rotational direction (21) via a connecting rod (6). The crankshaft (7) is arranged in a crankcase interior space (17). A mixture inlet (9) is provided in the crankcase interior space (17). In the crankcase interior space (17), at least one flow conducting element (23, 33, 43, 53, 63, 73) is provided which is spatially fixed and this flow conducting element projects into the crankcase interior space (17) and lies opposite to the rotational direction (21) of the crankshaft (7).

Abstract: A shaving head for an electric shaving apparatus, having an under cutter comprising at least one blade which is drivable in at least one direction of movement relative to an outer cutter. To achieve a good shaving result while at the same time protecting the skin to be best possible effect, it is proposed providing the blade with an outer boundary section which is raised in relation to the cutting edge, faces in the direction of the outer cutter and inclines upwardly from the cutting edge toward the outer cutter.

Abstract: A shaving head for an electric shaving apparatus, having an under cutter comprising at least one blade which is drivable in at least one direction of movement relative to an outer cutter. To achieve a good shaving result while at the same time protecting the skin to be best possible effect, it is proposed providing the blade with an outer boundary section which is raised in relation to the cutting edge, faces in the direction of the outer cutter and inclines upwardly from the cutting edge toward the outer cutter.

Abstract: An internal combustion engine has a cylinder (2) and a crankcase (4). A combustion chamber (3) is formed in the cylinder (2) and is delimited by a piston (5). The piston (5) rotationally drives a crankshaft (7) in a rotational direction (21) via a connecting rod (6). The crankshaft (7) is arranged in a crankcase interior space (17). A mixture inlet (9) is provided in the crankcase interior space (17). In the crankcase interior space (17), at least one flow conducting element (23, 33, 43, 53, 63, 73) is provided which is spatially fixed and this flow conducting element projects into the crankcase interior space (17) and lies opposite to the rotational direction (21) of the crankshaft (7).

Abstract: The invention relates to a series of layers containing at least one layer on the basis of REBa2CU3O7-Z or with a comparable crystallographic structure, wherein said layer is connected to a non-superconductive layer. The only material chosen for the non-superconductive layer is material containing atomic components which are chemically compatible with the superconductive material of the high temperature superconductive layer. Such a series of layers enables a multilayer system or also a cryogenic component, e.g. a Josephson contact, to be formed.