Bisomac Swing Stages

What Are Bisomac Swing Stages?

Definition: Bisomac swing stages are suspended scaffolds powered by Bisomac traction hoists, manufactured by Nihon Bisoh Co., Ltd. of Japan and distributed in the U.S. by Bee Access Products. A Bisomac hoist mounts to each end of a suspended platform and climbs the suspension wire rope, raising and lowering the stage along a building's face. Bisomac hoists are rated from 1,000 to 1,500 pounds, lift at 35 feet per minute, and run on standard 208V single-phase power.

The core of the line is the BISOMAC210 traction hoist, offered in several versions. The 210L uses a 1.2 hp motor rated for 1,000 pounds, making it lighter and more economical. The standard 210 uses a stronger 2 hp motor with an overload device, allowing it to be configured for either 1,000 or 1,500 pounds. The 210A is a pneumatic air-powered version for sites where electricity is unavailable or explosion risk is present, and the BISOMAC308 rounds out the lineup.

Bisomac hoists are best known for their low-voltage performance. Long power runs on tall buildings cause voltage drop that can stall weaker hoists, but Bisomac motors are designed to keep lifting smoothly at reduced voltage — often eliminating the need for booster transformers. Bisomac hoists are compatible with existing stirrups and are commonly paired with platforms from Altrex, Spider, Sky Climber, and other manufacturers. Through Scaffold Exchange, you can find vendors across the U.S. who carry Bisomac swing stage systems and compare their inventory, rental rates, and availability in your area.

Key Components of a Bisomac Swing Stage System

A Bisomac swing stage combines Bisomac traction hoists and their safety devices with a suspended platform, wire rope, and roof rigging to create a complete suspended scaffold system.

Power

BISOMAC Traction Hoist

The electric or air-powered hoist that climbs the suspension wire rope. A patented sheave is easy on the rope, helps prevent rope jams, and keeps operation quiet. Each hoist weighs roughly 108 pounds.

Safety

Overspeed Detection Device

Detects overspeed during descent and cuts power to stop the platform. An electromagnetic brake holds the load, and an optional slack rope device allows a second wire rope to be added.

Control

Control Box & Emergency Descent

Operation buttons, an emergency stop, an hour meter, and a pendant control socket. A controlled descent device with a locking feature lets operators lower the platform during a power loss.

Connection

Stirrup Adapters

Adapters bolt the hoist to the platform's stirrups. Bisomac hoists are designed to fit existing stirrups from major platform manufacturers — confirm compatibility with your vendor.

Rigging

Wire Rope & Roof Rigging

Suspension wire rope (5/16-inch for 1,000 lb configurations, 3/8-inch for 1,500 lb) hung from outrigger beams, parapet clamps, davits, or roof anchors engineered for the system's load.

Common Applications & Job Site Uses

Bisomac-powered swing stages are used on facade construction, restoration, and maintenance projects where crews need reliable vertical access — especially on tall buildings where long power runs make low-voltage performance critical.

High-rise and ultra-high-rise facade construction

Curtain wall, glazing, and window installation

Masonry restoration, tuckpointing, and facade repair

Exterior painting, caulking, and waterproofing

Window cleaning and routine building maintenance

Tank, bridge, and industrial painting using air-powered hoists

Hazardous or no-power locations where pneumatic hoists are required

Upgrading existing platforms with more reliable hoists

How Bisomac Compares to Other Motorized Scaffolding Systems

Bisomac is one of several major swing stage systems. Here is how it compares to other motorized access options and which projects each suits best.

Tractel Swing Stages

Hoist-focused suspended access

Known for Tirak traction hoists
Hoists often paired with other platform brands
Electric and air-powered hoist options
Best when matching existing Tractel inventory

Sky Climber Swing Stages

U.S.-based platform and hoist maker

Modular aluminum platforms and matching hoists
Integrated platform-and-hoist packages
Boiler and specialty platform options
Best when matching existing Sky Climber inventory

Bisomac Swing Stages ← You are here

Compact traction hoist system

1,000–1,500 lb rated loads at 35 fpm
Industry-leading low-voltage performance
Compatible with existing stirrups
Best for tall buildings and long power runs

Altrex Swing Stages

Modular aluminum suspended platform

Platform system, paired with third-party hoists
Fixed and adjustable corner sections
Double-deck, double-wide, and boiler configurations
Best for irregular facades and wrap-around work

Spider Swing Stages

Widely available rental system

Large North American rental network
Platforms and hoists from one supplier
Broad range of modular platform options
Best when local rental availability is the priority

OSHA Compliance & Safety Standards

Bisomac swing stages used on U.S. job sites must comply with OSHA standard 29 CFR 1926.451, which sets general requirements for all scaffolds including suspension scaffolds, along with the two-point adjustable suspension scaffold requirements in 29 CFR 1926.452(o). Hoists must be tested and listed by a qualified testing laboratory, and workers on a two-point suspension scaffold must be protected by both a guardrail system and a personal fall arrest system. Always operate within the hoist's rated load and verify supply voltage is within the manufacturer's specified range.

Hoists tested and listed by a qualified testing laboratory
Personal fall arrest tied to an independent lifeline for each worker
Guardrails and toe boards installed on the platform
Roof rigging able to resist four times the tipping moment of the scaffold
Wire rope diameter matched to the hoist's rated configuration
Scaffold inspected by a competent person before each work shift

OSHA Standard 29 CFR
1926.451

Scaffolds & Suspension Scaffolds — U.S. Construction Regulations

OSHA Interpretations & Rulings →

Frequently Asked Questions

A Bisomac swing stage is a suspended scaffold powered by Bisomac traction hoists. A hoist at each end of the platform climbs the suspension wire rope, allowing crews to raise and lower themselves along a building's facade. Bisomac hoists are made by Nihon Bisoh Co., Ltd. of Japan and distributed in the U.S. by Bee Access Products.

The 210L uses a 1.2 hp motor rated for 1,000 pounds, making it lighter and more economical without needing an overload device. The standard 210 uses a 2 hp motor with an overload device and can be configured for either 1,000 or 1,500 pounds. Both lift at 35 feet per minute and run on 208V single-phase power.

On tall buildings, long power cables cause voltage to drop by the time it reaches the hoist. Many hoists struggle or stall at reduced voltage, requiring booster transformers. Bisomac hoists are designed to keep lifting smoothly at lower voltage, improving reliability and duty cycle on high-rise projects.

Use the Scaffold Exchange vendor map to search by your location and filter by equipment type. You can see which local suspended scaffolding companies carry Bisomac hoists and swing stages, compare their inventory and pricing, and contact them directly through the platform.

Yes. When rigged correctly, operated within their rated load, and used with guardrails and personal fall arrest systems on independent lifelines, Bisomac swing stages meet OSHA 29 CFR 1926.451 and 1926.452(o) requirements. Bisomac hoists are tested to UL specifications. Visit the OSHA website for full interpretations and rulings on these standards.

Yes. Bisomac hoists are designed to be compatible with existing stirrups and are commonly paired with platforms from Altrex, Spider, Sky Climber, and others using stirrup adapters. Always confirm compatibility with your vendor and follow both manufacturers' documentation before combining components.