Abstract: Equipment for indicating a bed-wetting in a bed comprising a bed-wetter sheet and a measuring- and control system. A measuring circuit is furnished to test whether the electrode in the bed-wetter sheet are intact, and afterwards to measure the conductivity in the normal state between the two from each other electrically isolated electrodes whereby the conductivity between the two electrodes will fall drastically by a bed-wetting, human fluids containing salt being spread on the sheet, and indicate the bed-wetting. The measuring circuit is furnished to as a part of a routine to enter into a resting state whereby the measurement is performed with a prearranged fixed time interval.

Abstract: Equipment for indicating a bed-wetting in a bed comprising a bed-wetter sheet and a measuring- and control system. A measuring circuit is furnished to test whether the electrode in the bed-wetter sheet are intact, and afterwards to measure the conductivity in the normal state between the two from each other electrically isolated electrodes whereby the conductivity between the two electrodes will fall drastically by a bed-wetting, human fluids containing salt being spread on the sheet, and indicate the bed-wetting. The measuring circuit is furnished to as a part of a routine to enter into a resting state whereby the measurement is performed with a prearranged fixed time interval.

Abstract: A linear actuator includes a reversible electric motor which drives a spindle via a reduction gear with several stages and an activation element connected with it, and an overload clutch in connection with the first stage or one of the first stages in the reduction gear. This is advantageous in terms of structure and load and greater flexibility is achieved in the construction of the structure.

Abstract: A linear actuator with a reversible electric motor (2) which drives a spindle (4) via a reduction gear with several stages and an activation element (6) connected with it. An overload clutch (21) is arranged in connection with the first stage or one of the first stages in the reduction gear. This is advantageous in terms of structure and load. Greater flexibility is achieved in the construction of the structure, and the clutch is moreover not loaded so severely.

Abstract: A power supply for DC motors, in particular for actuators for use in the adjustment of tables, beds and the like, comprises a transformer (T1) with a rectifier (D1-D4) and a buffer capacitor. The power supply comprises voltage limiting means (Z1) coupled in parallel with the motor and connected to switch means (Q1) so that the motor is connected on a first part of the sine half-waves, but is disconnected when the voltage determined for the voltage limiter is reached. This ensures a good mean voltage, and the voltage does not exceed an upper permissible value. This also means that the motor speed is more independent of the load, which is an advantage e.g. in case of height-adjustable tables.

Abstract: A power supply for DC motors, in particular for actuators for use in the adjustment of tables, beds and the like, comprises a transformer (T1) with a rectifier (D1-D4); and a buffer capacitor. The power supply comprises voltage limiting unit (Z1) coupled in parallel with the motor and connected to switch unit (Q1) so that the motor is connected on a first part of the sine half-waves, but is disconnected when the voltage determined for the voltage limiter is reached. This ensures a good mean voltage, and the voltage does not exceed an upper permissible value. This also means that the motor speed is more independent of the load, which is an advantage e.g. in case of height-adjustable tables. In an embodiment, the power supply comprises additional means for measuring the current power in the motor, and this measurement is used as a feedback for controlling the motor speed to keep the speed of the motor.

Abstract: An electric circuit is provided for an inductive load including a first relay and a second relay for connecting the inductive load with a power supply. Both relays are connected to the inductive load so as to be activated when the voltage drop across the inductive load is to be interrupted and/or inverted.

Abstract: A power supply for DC motors, in particular for actuators for use in the adjustment of tables, beds and the like, comprises a transformer (T1) with a rectifier (D1-D4, and a buffer capacitor. The power supply comprises voltage limiting means (Z1) coupled in parallel with the motor and connected to switch means (Q1) so that the motor is connected on a first part of the sine half-waves, but is disconnected when the voltage determined for the voltage limiter is reached. This ensures a good mean voltage, and the voltage does not exceed an upper permissible value. This also means that the motor speed is more independent of the load, which is an advantage e.g. in case of height-adjustable tables.