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4B - Tackle blocks

 

4B - Tackle block - 300 Wheels - 1 nylon wheel + ball bearingsØ 35 mm Races - 1 race Frame - made of black nylon + stainless steel Max. load - 300 kg For ropes - textile fibre Ø 8 mm
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4B - Tackle block - 400 Wheels - 1 nylon wheel + ball bearingsØ 45 mm Races - 1 race Frame - made of black nylon + stainless steel Max. load - 400 kg For ropes - textile fibre Ø 10 mm
4B - Tackle block - 400 4B - Tackle block - 300
4B - Tackle block - 4002 Wheels - 2 nylon wheels + ball bearingsØ 45 mm Races - 2 races Frame - made of black nylon + stainless steel Max. load - 400 kg For ropes - textile fibre Ø 10 mm
4B - Tackle block - 4003 Wheels - 3 nylon wheels + ball bearingsØ 45 mm Races - 3 races Frame - made of black nylon + stainless steel Max. load - 400 kg For ropes - textile fibre Ø 10 mm
4B - Tackle block - 600 Wheels - 1 nylon wheel + ball bearingsØ 25 mm Races - 1 race Frame - made of stainless steel Max. load - 600 kg For ropes - - textile fibre Ø 2,5 mm- steel Ø 2,5 mm
Compagnia Finzi Pasca, ''La verità'' Итальянские занавесы made of HLU - Lucilla and of white ASC - Sceno muslin.Thanks to their low weight, the curtain made of HLU - Lucilla weighed about 10 kg, their manual handling systems were made with 4B - Tackle blocks of the type 400 and 4002 and 3C - Пеньковый трос Ø 10 mm.
Detail of the manual handling system of a modest sized Итальянский занавес.The double 3E - Трос Poly on the side of the maneuver uses a 4B - Tackle block of the type 4002, while the return to the opposite corner of the curtain uses the type 400.
The 4B - Tackle blocks are small pulleys equipped with a quick coupling device.
They are mainly used for the return of textile ropes or, only some models and more rarely, for wire ropes.
Due to the small diameter of the pulleys, which allows only a low ratio with the rope diameter, they are intended exclusively for manual maneuvers and light loads.
In scenography they are often used, together with other devices, to carry out the manual maneuvers of:
Итальянские занавесы
Французские занавесы
Складной занавес
Складной занавес вперед
Римские занавесы
Венецианские занавесы
Австрийские занавесы
sometimes even of large dimensions but of low weight.
The cases in which they are used in the construction of simple machines that exploit the principle of mechanical advantage are an exception.
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Compagnia Finzi Pasca, ''La verità''

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