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Safety brakes for chain hoists

Safety brakes for chain hoists Electric chain hoists for stage technology must comply with BGV standards. Within these standards there are levels which define precisely for which tasks such hoisting devices are approved.

When using a chain hoist according to BGV-D8, loads must only be moved for assembly and disassem-bly purposes and personnel are not permitted to stand under the load at any time. After lifting, the load must be secured and the chain relieved in a procedure known as "dead hanging". Normally this type of hoist is equipped with a single circuit brake and is therefore not approved for load-holding or for \'in-performance\' use. In order to comply with BGV-D8 Plus or BGV-C1 hoists must be equipped with two independent DC fail-safe brakes such as the new ROBA-secustop by Mayr Power Transmissions.

Electric chain hoists to BGV-D8 Plus standard, in contrast to BGV-D8, are approved for load-holding applications. This makes the "dead hanging" procedure unnecessary although personnel are still not allowed to operate under a load whilst it is moving. Electric chain hoists, accredited to BGV-C1 comply with the highest safety requirements. These so-called point hoists are approved for moving loads even when people are standing underneath. These hoists can be used for both assembly and disassembly work as well as for load moving during shows and events.

The new ROBA-secustop brake from Mayr Power Transmissions is a dual circuit fail-safe brake which has been specifically developed for BGV-C1 hoisting applications. Currently the series includes three sizes with a braking torque range from 2x4Nm up to 2x16Nm. The compact and enclosed design ensures easy handling and installation, and the working air gap is pre-set and so does not require re-adjustment meaning that malfunctions due to operating and adjustment errors are eliminated. The ROBA-secustop is equipped with an integrated damping unit for the reduction of switching noise (<65dBA) allowing \'in-performance\' use. Every brake is 100% inspected and tested in the factory in order to guarantee the highest operational safety and reliability.

Maintenance of the ROBA-secustop is limited to periodic inspection of the friction linings which are extremely wear-resistant and have a very long service life.

Mayr Power Transmissions offers a wide range of safety brakes for stage and theatre installations including the market leading ROBA-stop-silenzio and ROBA-stop-Z dual circuit brakes. The new ROBA-secustop has been developed to as an extremely economic brake for BGV-C1 electric chain hoists and other small hoisting devices.
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