A fall arrest device for blocking a rope when a relative speed between the rope and the device reaches a threshold value comprises a blocking mechanism for blocking the rope, and a trigger mechanism configured for triggering an activation lever of the blocking mechanism for activating the blocking mechanism for blocking the rope when the speed reaches the threshold value, wherein the trigger mechanism comprises a drive axis rotated by the rope upon relative movement between the rope and the fall arrest device, the drive axis carrying a centrifugal weight holder, wherein at least one centrifugal weight is held acting against a restoring force of a spring, wherein the at least one centrifugal weight is movable between an inactive position and a trigger position for triggering the activation lever when the speed reaches the threshold value. The centrifugal weight holder is arranged rotatably relative to a release gear that comprises a toothing engagable by an actuator member of the at least one centrifugal weight, when the at least one centrifugal weight is in the trigger position.

A lift assembly including an article to be lifted between a lowered position and a raised position, a flexible drive element coupled to the article and defining a longitudinal axis, a power mechanism coupled to the flexible drive element, a drum powered by the power mechanism and dimensioned to facilitate winding of the flexible drive element onto the drum, and a cable keeper providing a force on the flexible drive element to bias the flexible drive element toward the drum.

A lift assembly including an article to be lifted between a lowered position and a raised position, a flexible drive element coupled to the article and defining a longitudinal axis, a power mechanism coupled to the flexible drive element, a drum powered by the power mechanism and dimensioned to facilitate winding of the flexible drive element onto the drum, and a cable keeper providing a force on the flexible drive element to bias the flexible drive element toward the drum.

A vertical lifting device and method are provided. The vertical lifting device includes a fixed frame fixed to a foundation. A first cavity allowing passage of a lifting rope is provided in the middle of the fixed frame. A sliding frame moving horizontally on the fixed frame is arranged above the fixed frame. A second cavity allowing passage of the lifting rope is provided in the middle of the sliding frame. At least two stepping vehicles alternately lowering or lifting weights are arranged on the sliding frame and move on the sliding frame. The stepping vehicles are spaced in preset distances. The lifting rope penetrates through the stepping vehicles in sequence. Each stepping vehicle is provided with a clamping part clamping the lifting rope and a driving mechanism driving the stepping vehicle to move on the sliding frame.

A chain guide for a chain winch and a chain winch which includes such a chain guide. The chain guide is rotatable about a first rotational axis and adapted for support of a chain including chain links having at least two different sizes where a first chain portion includes a plurality of first chain links and a second chain portion includes a plurality of second chain links where the size of the second chain links is larger than the size of the first chain links. The chain guide includes at least one first chain support, which is adapted for support of at least the first chain links of the first chain portion, and at least one second chain support, which is adapted for support of at least the second chain links of the second chain portion.

A chain guide for a chain winch and a chain winch which includes such a chain guide. The chain guide is rotatable about a first rotational axis and adapted for support of a chain including chain links having at least two different sizes where a first chain portion includes a plurality of first chain links and a second chain portion includes a plurality of second chain links where the size of the second chain links is larger than the size of the first chain links. The chain guide includes at least one first chain support, which is adapted for support of at least the first chain links of the first chain portion, and at least one second chain support, which is adapted for support of at least the second chain links of the second chain portion.

A man over board rescue system 100 may comprise a main body 200 with the main body quickly and easily being attached and detached to a ship's bitt. Thus, the system may be quickly set up prior to departing and quickly put away at the end of a voyage. The system allows for the fast and efficient rescue of a person overboard without need for a rescuer to enter the water or to risk bodily injury in retrieving a person in the water. The system provides secure mechanical means allowing for a winch to be used in the support of a person which is a significant departure from the prior art.

A velocity control device for controlling the velocity of a load on a flexible tension member can include a chassis with a portion of the chassis peripheral surface defining an exit aperture. The device can also include a capstan having a proximal face joined to the chassis and a distal face separated at a distance from the proximal face. A peripheral capstan surface can be tapered from a greatest diameter near the distal face to a smallest diameter near the proximal face. The device can include a throttle attached to the chassis having an interior surface defining an opening through which the tension member can pass. The interior surface is in at least partial contact with the tension member. Heat produced by kinetic energy in the flexible tension member is transferred to the throttle, and the change in system internal energy produces a drag force on the flexible tension member.

A velocity control device for controlling the velocity of a load on a flexible tension member can include a chassis with a portion of the chassis peripheral surface defining an exit aperture. The device can also include a capstan having a proximal face joined to the chassis and a distal face separated at a distance from the proximal face. A peripheral capstan surface can be tapered from a greatest diameter near the distal face to a smallest diameter near the proximal face. The device can include a throttle attached to the chassis having an interior surface defining an opening through which the tension member can pass. The interior surface is in at least partial contact with the tension member. Heat produced by kinetic energy in the flexible tension member is transferred to the throttle, and the change in system internal energy produces a drag force on the flexible tension member.

The invention discloses a power-loss triggering device, including: a frame, an electromagnet and an impact bar; the impact bar vertically and movably penetrates through the frame; an energy storage piece is arranged and the energy storage piece may exert a downward action force on the impact bar; when the electromagnet is energized, the impact bar is positioned through electromagnetic force; when the electromagnet loses power, the impact bar loses a holding power from the electromagnet and conducts a downward impact movement under the action force of the energy storage piece. The power-loss triggering device is implemented through the electromagnet and an intermediate mechanism. In this invention, the electric current, the energy consumption and the cost of the electromagnet are reduced, the service life of the long-time energized electromagnet is prolonged.