Abstract: A retaining device for a sensor is mounted on a part having an opening, in particular, on an outer part of a motor vehicle. The retaining device includes an endplate attachable to an inner surface of the part and having an opening. The retaining device also includes a housing adjacent to the endplate for receiving at least part of the sensor. An additional member is mounted inside the opening in the endplate and includes a projection projecting outwards from the endplate. The additional member can be brought into engagement with the opening in the part such that the opening in the endplate is centrally aligned with respect to the opening in the part.

Abstract: A process for perforating workpieces and a tool for carrying out this process are envisaged. In the process described it is envisaged that a cutting tool is used to make an opening in a workpiece and stamping is carried out in the region of a cut edge of the opening purely by interlocking and frictional engagement.

Abstract: A retaining device for a sensor is mounted on a part having an opening, in particular, on an outer part of a motor vehicle. The retaining device includes an endplate attachable to an inner surface of the part and having an opening. The retaining device also includes a housing adjacent to the endplate for receiving at least part of the sensor. An additional member is mounted inside the opening in the endplate and includes a projection projecting outwards from the endplate. The additional member can be brought into engagement with the opening in the part such that the opening in the endplate is centrally aligned with respect to the opening in the part.

Abstract: In a roller sport device, particularly a single-track skateboard or a single-track roller skate, having two roller axles disposed one behind the other with single-track rollers which run one behind the other and which are disposed thereon, which axles are disposed on a board or on a supporting frame, the rearmost of the two roller axles (rear axle) can swivel about an axle (steering axle) which points obliquely downwards and forwards and which forms a trailing angle. The running faces of the rollers are curved transversely to the direction of travel and have a high coefficient of friction similar to that of rubber.

Abstract: A lamp assembly for use with a rapid start metal halide bulb, and including a lamp head housing and a power supply source. The lamp head housing includes a circuit board with power supply contact surfaces, a high voltage resistant socket, a reflector, and an on-off switch. The circuit board provides an ignition voltage, an ignition voltage spike, and a supply voltage to the rapid start metal halide bulb. The power supply contact surfaces connect power to the circuit board. The high voltage resistant socket holds the rapid start metal halide bulb and is electrically coupled with the circuit board. The reflector is arranged relative to the high voltage resistant socket, and reflects light emitted from the rapid start metal halide bulb. The on-off switch is electrically coupled with the circuit board.

Abstract: A device and method for interrupting current flow to an electrically-powered apparatus is disclosed. The device includes a means for detecting a selected value of a physical parameter associated with the operation of the externally powered electrical apparatus, a trigger circuit incorporating an integrated circuit, a firing device which responds to the trigger circuit by generating a conductive plasma, an electronic measurement circuit to prevent unwanted firing of the firing device and thin conductors which are destroyed by the firing device when the conductive plasma forms an electric arc between them. Current flow to the electrically-powered apparatus is thereby terminated.

Abstract: A protective device for portable apparatus supplied from a high-voltage line is disclosed, which includes a connecting line from an electrical supply. The device also includes a protective switch with contact sets located in the supply lines and pre-stressed contact springs which are maintained in a closed position by a hoop-like fusible wire. An electronic firing circuit is disposed on a flat plate, together with the protective switch and the connections to the supply line and to the apparatus. The two-pole outlet of the firing circuit terminates in contact lugs with which the ends of the fusible wire can be connected mechanically and electrically. The circuit plate is, preferably, seated in the housing of a right angle plug, the contact pins of which are cast or pressed into the bottom of the housing and support the circuit plate while, at the same time, their heads constitute the opposite contact for the contact springs of the protective switch.

Abstract: In an electrically powered apparatus, particularly a portable apparatus, having a flexible shielded main connection line (50) and an electronic protective device, said protective device is housed in the main connection plug (60) or in an adapter (61) to which the main connection line (50) can be coupled, wherewith said protective device serves as a safety device in the event of leakage of fluid into the apparatus or of current to ground or to protect the user.

Abstract: To protect the operator of an electrically powered apparatus in a damp room or in the presence of water or other electrically conductive fluid against an electric shock, there is provided a protective device comprised of a probe in the form of a double conductor which the user cannot contact when handling or operating the apparatus. In the presence of a conductive fluid the impedance of the probe changes. The probe is connected to the input of a trigger switch circuit which includes a semiconductor switch. The trigger circuit triggers the semiconductor switch when the impedance of the probe changes. The current which flows as a result of the closing of the semiconductor switch releases an automatically opening switch, the contacts of which lie in the incoming power supply wires of the apparatus, which contacts are normally held closed by means of a material which is fusible upon direct or indirect heating by means of said current.

Abstract: A speed governor, for internal combustion engines, with an electromechanical adjustment member for adjusting a butterfly valve or an injection pump, an electronic speed receiver, and an electronic control member. The adjustment member has a stationary part with coils, and a part, with a permanent magnet, rotatably journalled in the stationary part, with the magnetic field of the magnet passing through the coils; the permanent magnet is arranged in such a way that a torque of predetermined magnitude and direction is effective thereon during current flow through the coils. The permanent magnet may be embodied as an at least two-pole, axially magnetized ring with a first laminated-iron ring as a magnetic return, and the adjustment member may be provided with at least two stationary, evenly wound, sector-shaped coils and a second laminated-iron ring as a magnetic return.

Abstract: Weighing device, including a load table for supporting a load, a parallel motion system formed of transverse links for moving the load table, a vertical rod for supporting a load on the load table, a cross piece, a vibrating string being suspended from the vertical rod and the cross piece, and four magnet systems being disposed on the vertical rod for exciting the string to vibrations at higher frequency.

Abstract: A loudspeaker enclosure for use in housing loudspeakers, the loudspeaker enclosure comprising a casement having a generally rectangular cuboid shape, the casement including three layers. A first layer and a second layer comprise sheets of metal and are space apart to provide for an inner layer of plastic material. In one embodiment of the invention, the casement is formed by bending a sheet of material including the three aforementioned layers to conform to a generally rectangular cuboid shape. In another embodiment of the invention, the first layer of metal is bent to a rectangular cuboid shape defining four interior surfaces. A flat layer of plastic and a flat layer of metal is applied to each interior surface of the casement. The casement provides a wall having a relatively high density, a high modulus of elasticity and a high damping factor.

Abstract: A control mechanism for raising, swinging and lowering the pick-up arm of a record player comprising a disc having an arcuately shaped depression in the periphery thereof. The contacts of an electrical contact sensor switch are located in the disc peripheral depression and bridging of these contacts will cause generation of a first command signal for the control mechanism. Devices for generating second and possibly third command signals are associated with the disc which may be rotatably mounted.

Abstract: When the user presses a touch-activated switch a first time, a first digital storage device becomes set and furnishes a platter-motor-start signal to the control electronics of the platter drive motor. If the touch-activated switch is pressed a second time, the first digital storage device becomes reset, and the signal commanding that the platter drive motor operate terminates. A second digital storage device likewise assumes its set and reset states in response to the first and second pressing of the touch-activated switch. Sensors ascertain various operating conditions during the course of turntable operation, such as the swinging of the tone arm to the position corresponding to the lead-in groove of a phonograph record. The states of the digital storage devices are additionally dependent upon the conditions sensed by the sensors. Logic circuitry interprets the combinations of states of the digital storage devices and causes the requisite turntable operations to be performed, e.g.

Abstract: When a touch-activated switch unit is touched a first time, a platter-motor flip-flop arrangement assumes its motor-operate state, and when the switch unit is touched a second time, the flip-flop assumes its motor-not-operate state. A tone-arm swing-in flip-flop assumes its swing-in state when the platter-motor flip-flop assumes its motor-operate state. A tone-arm swing-out flip-flop assumes its swing-out state when the platter-motor flip-flop assumes its motor-not-operate state. A signal-transmission switch closes the transmission path between the swing-in and swing-out flip-flops and the electrical drive of the tone-arm swing mechanism, but only when the tone-arm lift mechanism has lifted the tone arm to raised position. A touch-activated lift-tone-arm switch is operated when touched for generating a lift-tone-arm command signal.

Abstract: When the user presses a touch-activated switch a first time, a first digital storage device becomes set and furnishes a platter-motor-start signal to the control electronics of the platter drive motor. If the touch-activated switch is pressed a second time, the first digital storage device becomes reset, and the signal commanding that the platter drive motor operate terminates. A second digital storage device likewise assumes its set and reset states in response to the first and second pressing of the touch-activated switch. Sensors ascertain various operating conditions during the course of turntable operation, such as the swinging of the tone arm to the position corresponding to the lead-in groove of a phonograph record. The states of the digital storage devices are additionally dependent upon the conditions sensed by the sensors. Logic circuitry interprets the combinations of states of the digital storage devices and causes the requisite turntable operations to be performed, e.g.

Abstract: A loudspeaker driver system linearizes loudspeaker operation by superimposing a high frequency (supersonic) signal on the low frequency (audio) signal. Features include a special crossover network for a multispeaker system, and an acoustic filter formed of perforated discs.