A hanging hand-driven chain hoist, is able to lift, sustain and lower a load hanging on a chain and a hook, by employing a sprocket built in a spherical helical gear driven by the rotational movement of a ring with internal spiral thread, coupled to a drive gear engaged by an drive chain pulled by an operator. An overload prevention and detection system provides safety against operator attempts to lift loads having weights over the capacity of the system.
B66D 3/16 - Chain or like hand-operated tackles with or without power-transmission gearing between operating member and lifting rope, chain, or cable operated by an endless chain passing over a pulley or a sprocket
B66D 3/02 - Manually-operated, e.g. lever-actuated, devices operating on ropes, cables, or chains for hauling in a mainly horizontal direction
A hanging hand-driven chain hoist, is able to lift, sustain and lower a load hanging on a chain and a hook, by employing a sprocket built in a spherical helical gear driven by the rotational movement of a ring with internal spiral thread, coupled to a drive gear engaged by an drive chain pulled by an operator. An overload prevention and detection system provides safety against operator attempts to lift loads having weights over the capacity of the system.
B66D 3/16 - Chain or like hand-operated tackles with or without power-transmission gearing between operating member and lifting rope, chain, or cable operated by an endless chain passing over a pulley or a sprocket
A01K 73/05 - Devices for spreading or positioning, e.g. control thereof for vertical sheering
A62B 1/14 - Devices for lowering persons from buildings or the like by making use of rope-lowering devices with brakes sliding on the rope
B66C 23/20 - Cranes comprising essentially a beam, boom or triangular structure acting as a cantilever and mounted for translatory or swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib cranes, derricks or tower cranes specially adapted for use in particular locations or for particular purposes with supporting couples provided by walls of buildings or like structures
An overload brake and method for trolley suspended on a flange of a load traveling apparatus girder prevents the displacement movement of a suspended load along a girder by clamping a brake between two symmetrical flange tabs of the girder. The girder is elastically deformed by the load which is applied to the girder by the contact between a surface of the girder and translation wheels that move the load along the girder. Upon sufficient elastic deformation, portions of the girder contact a brake to prevent movement of the load along the girder.
F16D 55/02 - Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
B66C 6/00 - Girders, or track-supporting structures, specially adapted for cranes
B66C 11/14 - Trolleys or crabs, e.g. operating above runways adapted to operate on crane or bridge structure of particular configuration, e.g. on reinforced concrete girders of rectangular cross-section
F16D 63/00 - Brakes not otherwise provided forBrakes combining more than one of the types of groups
A load lifting winch suspending a load from a hook (3) and a cable (5) which is wound onto a frustoconical drum (1) in order to reduce the winch vertical dimension when the hook (3) is in the fully upright position allowed by available vertical space elevation, and simultaneously decrease the forces applied to the lifting drive motor (4) as the load rises.
