Discussion of window washing support and equipment is covered in two separate articles. This article covers the two main platform systems including cages and bosun’s (boatswain’s) chairs. The first article covers different kinds of primary window washing anchors and suspension systems.
Bosun’s / Boatswain’s Chair
Bosun’s chairs are the most common form of platform used by window washers and facade maintenance crews. However, some companies and jurisdictions do not use them because of safety concerns.
The chairs, shown at left, carry a single person in the seated position. The diagram at left shows the chair suspended from a portable outrigger system, but it can be used with any suspension system. There is always a secondary fall arrest line that is attached to the worker and tied to a different anchor than the platform. Bosun’s chairs are decent controlled and cannot be used for ascending.
Cage systems provide more flexibility than Bosun’s chairs. Since the cages are powered by on-board motors, the cages can descend and ascend a building. In addition, cages come in various widths (generally up to 10 feet wide) allowing workers to access a wider area of the facade. The first diagram below shows a single-person cage suspended from a davit arm. The second diagram below shows a cage that is 10 feet wide, which can accommodate two workers, suspended by a roof car. There is always a fall-protection line provided for each worker and each of them must be tied to a different anchor.
Window Washing Equipment Manufacturers
The links below will take you to Archimat, our building product directory, which hosts a list of manufacturers.
Suspended Working Platform Introduction
The product are mainly used for the exterior construction, decoration and fitting-out works of multi-storey buildings such as the following: high rise elevator, cable way installation, granary, colliery, security inspection, tower hoist driver’s lift, welding of ship building, large tank, chimney, boiler maintenance, dam and bridge maintenance. The length can be up to 30 meters. Suspended platform is also applicable to exterior wall decoration, plastering,building insulation, coating, marble tile installation, glass curtain wall installation and cleaning. What’s more, we can design special platforms which can be used for special projects according to clients’ demands.
It is capable of accomplishing construction tasks without the help of scaffolds. Thereby the construction cost is greatly reduced and the efficiency is improved. In addition, this suspended working platform features reliable performance as well as easy operation and displacement.
Platform is the working place, consist of high balustrade, low balustrade, bottom plate, hoist mounting deck connected with bolt.
(2) Hoist mechanism
Hoist is the motor of suspended platform, adopted electric climbing principle.
Hoist is driven by electric regenerative braking and threephase asynchronous motor, starting through turbine & worm and gear reducer, with steel rope climbing, hoist works up and down following the rope, so keep the platform up and down.
(3) Safety lock
Safety lock is the protection equipment. When the platform goes acclivitous, or ropes are broken off and falling, the safety locks will lock the wire ropes automatically and quickly to ensure the safety of the operator from falling and inclining. The safefy lock is of swinging type.
(4) Suspension mechanism
Suspension mechanism is on the top of the building to suspend the platforms through the steel rope.
(5) Electrical control system
Electrical Contral System is used to control the movement of platforms, and the main elements are fixed in insulated board, Universal Switch,
Power Indicator, Start Button and the Emergency Stop Button are in the door board of the box.