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BISOMAC Brand History

Manual temporary suspended platform

It is said that the history of temporary suspended platform in Japan began with a manual temporary suspended platform imported from the United States during the 1930s. At the beginning of our establishment in 1966, we also used manual temporary suspended platforms to perform the exterior construction work, but it took about 20 minutes to rise due to use of human power, and the height of the buildings for which they could be used was limited to about 40 meters. At that time, temporary suspended platforms required much labor.


Birth of the first electric traction hoist MEA

In 1968, two years after the founding of the company, we developed a MEA type traction hoist in order to reduce workers' burden. This was a product that was utilized as an electric power tool for overhead wiring tension, and used 6 mm wire rope. It was the world’s first electric traction hoist with unlimited lifting height by wrapping a wire rope once around the sheave. This is the foundation of current electric traction hoists.



First traction hoist specialized for
temporary suspended platforms

During the postwar high economic growth period, demand for electric temporary suspended platforms increased in Japan. In the 1970s, the NTW type traction hoist was commercialized. The NTW was equipped with electromagnetic brake and mechanical brake to further improve reliability, and the wire rope diameter has been increased to 8 mm to enhance lifting capacity. It was the birth of a traction hoist specialized for temporary suspended platforms and features enhanced safety at for performing work at heights.


Load holding mechanism

Chain roller holding mechanism

The initial load holding mechanism was structured to generate frictional force by maintaining the wire rope by the chain roller when the load of the temporary suspended platform was applied to the traction hoist.



The first original machine

With the development of NTW, electric temporary suspended platforms have become widely used in scaffolding for exterior wall construction work. In 1980, during the period in which high-rise buildings were rapidly increasing, the BISOMAC108 traction hoist was completed by making full use of our original technology. As it was the original hoisting MAChine of BISOH, it was named "BISOMAC" and has became our main product and remains popular at present.


Load holding mechanism of
BISOMAC100 series

Lever roller holding mechanism

A friction force is generated when the roller secured in position by the lever holds the wire rope wrapped around the sheave. The rollers are attached to two levers (a main lever that tilts under the principle of "leverage" when the load of the gondola is applied and a sub lever that hold with a constant spring force).
Thanks to this mechanism, the varying load of the platform is constantly stabilized and transmitted to the sheave.


Expansion of temporary
suspended platform
rental business

Along with the increase in high-rise buildings in Japan, the needs for temporary suspended platforms have also increased. In order to reliably supply safe products, we have established an in-house maintenance service for temporary suspended platforms as well as a rental service. Thus, the rental business expanded.
With the background of business expansion, BISOMAC108 traction hoist, the heart of the rental temporary suspended platform, has also been fine tuned, including improvements made to maintenance.


Start to develop new products

From the 1990s, renovation work of skyscrapers began to increase. We decided to start developing new products with the aim of improving safety to make outer wall work more efficient by use of temporary suspended platform, high-speed elevation, and raising and lowering with high loading. A high level of technology was required for development. It was indispensable to develop a stable load holding mechanism for the wire rope, and many attempts through trial and error were made.


The birth of a new load holding mechanism

A few years later, we succeeded in developing a new load holding mechanism that did not require rollers and chains. In the new load holding mechanism, the load was maintained by inserting the wire rope into the groove of the sheave. As a result, the durability of the wire rope was more than four times higher than the conventional one, and the life of the sheave was semi-permanent. Furthermore, a simple structure around the sheave has been realized, which contributed to improvement of maintainability. This technology forms the cornerstone of our traction hoist, which is now widely used around the world.



BISOMAC208 traction hoist is the first to adopt and commercialize a new load holding mechanism. In order to perform differentiation, the parts to be constructed were made into a unit as much as possible with the aim of achieving compactness and weight reduction, and a structure that allows easy maintenance was created. Furthermore, the ascending/descending speed has been increased by 35% compared with conventional speeds, and the hanging load has been raised by 15% compared with conventional loads. BISOLOCK, a safety device that detects speed abnormalities of the temporary suspended platform and prevents the fall of the temporary suspended platform, was installed internally to create a product with enhanced safety.


First global model

Worldwide expansion, which has been our goal since its foundation, began with Zmac. In 1994, we acquired the industry standard UL1323 certification, and in 1996, we began promoting in the US under the product name Zmac/1000. Its ease of handling and maintainability are highly praised, and the product continues to be popular.



Heavy duty use

We commercialized BISOMAC210 traction hoist as a product that can handle large-scale renovation of high-rise buildings. BISOMAC210 traction hoist has a lifting capacity of 800 kg, is installed in
12 meter long span temporary suspended platform, connected temporary suspended platform, etc., and is used as the standard machine in large-scale renovation of high-rise buildings. We have developed a lineup featuring models conforming to regulations of countries all over the world, ultra-high speed models, and explosion-proof models driven by air.


Global development of

The global model BISOMAC210 traction hoist, which began promoting in 2006, has a proven sales track record of over 10,000 units worldwide and its utility is highly praised. It is highly resistant to breakdown, has excellent maintainability, reduced running cost, has earned positive reputation, and established its position within the industry.



The newest BISOMAC

Before the BISOMAC series was born, we have consistently continued to develop products with the aim of improving safety and ease of use. As a result, BISOMAC traction hoist has continued to create new added value beyond basic functions as a traction hoist, and has changed the industry standard.

Our mission is continue to create easy-to-use and safe products for all persons involved in working at heights, and to realize a world in which dangerous work at heights becomes safer through BISOMAC.

BISOMAC308 traction hoist improves all functions related to maintainability, handling, performance, and safety, and condenses them into a compact product.

It is a symbol of our value.

We will continue to evolve along with BISOMAC and aim to realize "safer work at heights."


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