A linear actuator with a reversible electric motor (3,11,26,27,34), which over a transmission (4,12,24,25,35) drives a non-self locking spindle (5,14,22,23,36), by which a tube-shaped positioning element can be moved axially, in that it with one end is connected to a spindle nut (6,15) on a spindle
A linear actuator with a reversible electric motor (3,11,26,27,34), which over a transmission (4,12,24,25,35) drives a non-self locking spindle (5,14,22,23,36), by which a tube-shaped positioning element can be moved axially, in that it with one end is connected to a spindle nut (6,15) on a spindle (5,14,22,23,36). The actuator comprises a quick release (9,13) for releasing the tube-shaped positioning element (7,16,28,29,37) from the electric motor (3,11,26,27,34) and the part of the transmission (4,12,24,25,35) that lies from the motor (3,11,26,27,34) to the quick release (9,13) such that the spindle (5,14,22,23,36) is set to rotate by the load on the tube-shaped positioning element (7,16,28,29,37). The actuator further comprises braking means for controlling the speed of the tube-shaped positioning element (7,16,28,29,37) during the outer load, when the quick release (9,13) is activated. The braking means consists of a centrifugal brake (38,60), by which it is possible to provide a construction where the lowering speed is self-controlled when the quick release (9,13) is activated.
대표청구항▼
1. A linear actuator which comprises: a non-self-locking spindle,a spindle nut mounted on the spindle to move axially along the spindle with rotation of the spindle,a non-rotating tube-shaped positioning element associated with the spindle nut to move axially along the spindle with the spindle nut,a
1. A linear actuator which comprises: a non-self-locking spindle,a spindle nut mounted on the spindle to move axially along the spindle with rotation of the spindle,a non-rotating tube-shaped positioning element associated with the spindle nut to move axially along the spindle with the spindle nut,a reversible electric motor for rotating the spindle, said electric motor including a shaft with a worm,a quick release mechanism for disconnecting the spindle from the electric motor when the quick release mechanism is activated, andbraking means for controlling a speed of movement of the positioning element along the spindle under an external load after the quick release mechanism has been activated, said braking means including a centrifugal brake connected to the spindle and a gearing mechanism between the centrifugal brake and the spindle for increasing revolutions of the centrifugal brake, said gearing mechanism comprising a planetary gear comprising a sun wheel, a planetary wheel holder and an outer toothed rim with outer worm wheel toothing to which the worm is engaged, the spindle being connected to the planetary wheel holder and the sun wheel is connected to the centrifugal brake and the quick release mechanism. 2. The linear actuator according to claim 1, wherein the centrifugal brake includes a stationary drum with an inner wall defining a cylindrical cavity and a braking surface, a rotor, a drive plate fastened to the rotor, a flyweight arranged in the cylindrical cavity of the stationary drum and which is swivel hinged to the drive plate, a brake lever which together with the flyweight is hinged to the drive plate, a connection rod which with one end is pivotally connected to the brake lever to which the flyweight is not hinged, such that interaction between brake lever, connection rod and flyweight increases pressing of the flyweight and the brake lever against the wall of the cavity of the stationary drum, when the flyweight and the brake lever are thrown against the wall. 3. The linear actuator according to claim 2, wherein a flyweight and a brake lever are hinged to the drive plate at the wall of the cylindrical cavity of the stationary drum. 4. The linear actuator according to claim 2, including three flyweights and three brake levers and also three connection rods, and where an outer side of the flyweights in a thrown position against the wall in the cylindrical cavity of the stationary drum together with the outer side of the brake levers essentially covers a whole circumference of the wall.
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이 특허에 인용된 특허 (13)
Jensen, Svend Erik Knudsen; Abrahamsen, John, Actuator.
Dewert Eckhart (Dorfstrasse 155 4904 Enger DEX), Adjusting device for a lattice plate equipped with at least a tiltable back part and a tiltable foot part.
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