VG Safety Gears consist of a pair of end assemblies, which can bolt directly to the buffer channels or car frame. Each end assembly has two spring loaded linkage mechanisms, which carry and engage the friction gibs. The linkage mechanisms are designed to centralise the safety gear when it is engaged. This feature, in conjunction with large running clearances, means that VG Safety Gears can be used with spring loaded roller guide shoes, sliding shoes or solid rollers.
The force needed to release the safety gear is also very low. This enables the safety gear to be disengaged by the lift machine and not to require special lifting tackle.
To comply with the harmonised version of EN81, a lift must prevent “uncontrolled upward movement”. As all VG Safety Gears can be inverted to brake in the upward direction, code compliance can be obtained by fitting separate “upward acting” safety gear in tandem with a standard “downward acting” safety. This additional safety can either be attached directly to the downward acting safety gear or mounted separately on top of the crown channels.
The VG-5 Safety Gear is bi-directional safety gear and has two independent braking mechanisms within a common housing. Both bi-directional and “combined” safety gears can be operated from a single bi-directional overspeed governor.
The ‘special project’ range of VG Safety Gears are designed specifically to each application, but are based on the tried and tested BSI approved standard range of VG Safety Gears.
This is a video of the VG6 Safety Gears during testing on a recent lift modernization project.
The following video demonstrates the safety gears working on a test stand.