Abstract: The circuit arrangement for detecting pulse-shaped interferences in an electrical signal comprises an input (7), a high-pass filter (8) having a cut-off frequency lying between 40 Hz and 1000 Hz, one or two signal paths (25, 25') and an output (5). A signal path (25) comprises a peak detector (10), a device (11) for determining a running average value, of its input signal, a delay unit (12) and a comparator (15). The output of the peak detector (10) is coupled via the device (11) for determining a running average value to a first input (13) of the comparator and via the delay unit (12) to a second input (14) of the comparator. The comparator compares the delayed output signal of the peak detector with the output signal of the device for determining the running average value and supplies an output signal to its output (16) if the output signal of the peak detector is larger than a times the output signal of the device for determining the running average value, where it holds that a>1.

Abstract: The invention relates to a microwave oven comprising control means which reduce the risk of no-load operation and which co-operate with an actuating element which switches on the magnetron with the aid of power-supply means depending on open and closed states of the oven door. The invention is characterized in that the control means comprise a bistable electromechanical device which responds to closures of the door by counting the number of these closures and which enables the magnetron to be energized after an even number of closures of the door, one cycle of operation of the bistable electromechanical device comprising two open states and two closed states of the door. The bistable device may comprise a lever device which actuates a pendant-type electrical switch or a remote-controlled switch.

Abstract: A discoid cold cartridge filled with a latent heat storage medium, is formed from at least two parts joined together, of which one part includes the discoid main wall facing the scraper and stirrer tool and the other part of a trough-shaped base. The discoid main wall serving to act together with the scraper and stirrer tool has an inherently stable, curved shape and at least one wall of the base is reversibly adaptable to the change in volume of the latent heat storage medium in phase transition.

Abstract: A dry-shaving apparatus comprises a holder for a circular cutting unit which includes an external cutting member formed with hair-entry apertures, having an outwardly extending annular flange portion, and movable transversely relative to the holder, and an internal cutting member rotatably drivable relative to the external cutting member. A retaining plate is positioned inside the holder. The external cutting member is detachably secured to the retaining plate, the internal cutting member being retained between the external cutting member and the retaining plate, by means of two resilient arms engaging around the flange portion of the external cutting member and secured to the retaining plate. A spring associated with the retaining plate moves the same transversely relative to the holder.

Abstract: A protection against overheating not only of the heat transmitting component (2), but also of the components (3) surrounding said component is achieved. A latent heat store (1) is provided between the heat transmitting component (2) or a part thereof and a component (3) to be protected from overheating or a part thereof. The latent heat store (1) comprises a latent heat storing agent, whose melting-point T is between the operating temperature of the heat transmitting component (2) and the maximum permissible temperature of the component (3) to be protected. The quantity is proportioned so that the storage capacity of the latent heat store (1) is sufficient for the amount of heat maximally to be transmitted by the heat transmitting component (2). Between the heat transmitting component (2) and the latent heat source (1) and between the latent heat store (1) and the component (3) to be protected a thermal insulation (4,5) is provided.

Abstract: A dry-shaving apparatus comprises a housing having a holder for a shear plate with hair-entry apertures and a cutter which is rotatable about an axis of rotation and which comprises a carrier for cutting elements which are movable relative to the carrier, in which during rotation of the cutter, as part of a revolution, each point of a cutting edge at the end of a cutting element follows a constrained path which is defined by the shear plate and each point of a cutting edge follows a circular free path when the ends are clear of the shear plate. At the more advanced axial end of the first cutting element, viewed in the direction of rotation, the radius of a circular free path of the cutting edge is smaller than the distance from the axis of rotation to the corresponding portion of the shear plate at the location where at this end the free path changes into the constrained path, so that the cutter comes gradually into contact with the shear plate.

Abstract: A shaving apparatus comprises a first cutting member having a circular central body, and a second cutting member having a wall provided with hair-entry apertures, the first cutting member being associated with and rotatable relative to the second cutting member. A plurality of blades is provided for engagement with the second cutting member. A plurality of resilient blade arms respectively connects the blades to the central body, each blade arm lying in a plane inclined in the direction of rotation of the first cutting member. Each blade arm is in the form of a leaf spring and extends in its longitudinal direction radially from the central body and in its lateral direction substantially along a helix extending both in the axial direction towards the second cutting member and in the direction of rotation.

Abstract: A shaver head with a shaver head frame (1), which supports a curved, perforated shaver foil (2) which is fitted by means of its apertures (11, 12) provided in the vicinity of its longitudinal edges onto hooks (7, 8) projecting from the longitudinal sections (3, 4) of the shaver head frame. The perforated shaver foil is provided on its outer side facing the longitudinal sections of the shaver head frame in the vicinity of each of its two longitudinal edges with at least one projecting attachment (13, 14), spaced apart from the free end (15, 16) of the adjacent longitudinal section, which is smaller than the depth (t) of the hooks projecting from the longitudinal sections and which with its upward extension projects at least into the dimensional range (w) of the wall thickness of the longitudinal sections in the vicinity of their free ends (FIG. 1).