Quick action clamping for small diameters
Original article date: October 1999
For securing tubes, cables and the like, Protex says that its Bandclamp is perhaps the only available method of rapidly clamping small diameters
Why does the Bandclamp score over the old-established and arduous worm-drive hose clip?
The answer, it seems, is because it can be opened and closed repeatedly over long service intervals, it may be released completely and it is fast to operate. For rapidly clamping small diameters in the range 110 to 25mm, it is arguably the only solution available. The simple platform type with spring claw, made in stainless or zinc-plated mild steel, offers custom band diameters from 110 down to 40mm. The maximum spring load is 65kg at a 1.5mm extension.
Technically described as an overcentre, lever-action fastener, there are many variants: Protex is one of only about 10 manufacturers worldwide and supplies around 500 individual catalogue items, plus variations, specials and alternative finishes. Variations include with or without a platform or saddle and mounted on a flexible, custom-made, stainless steel band. Some have an optional safety catch to prevent accidental opening. They can be released fully or made captive.
The variations in design are not to accommodate different diameters of substrate, but because of the pressure to be borne. For example, the 60-1750/PBC And 61-1750/PBC models are down to 25mm diameter. They are pressure tested up to the highest pressure that bandclamps can sustain – 6.5bar (100psi). To accommodate such an elevated pressure, these models have both a special strengthening saddle (a semi-circular shoe) and a triangular platform with a reinforcing ribbed plate underneath.
To make certain applications easier to accommodate, some models of the platform type are also designed with a captive catchplate and hinge built into the band.
Many bandclamps also actually incorporate a worm-drive hose clip – a device with which they normally compete – for extended adjustment (10 times the normal value). Others are in kit form for self-assembly, because users cannot always predict the required diameter in advance.
Uses exist in automotive engineering, chemical, pharmaceutical, food and water and waste treatment industries. Bandclamps are used to secure rubber hoses and tubes and other items, and to facilitate regular Health & Safety examination of exhaust ventilation plant.
- Protex
October 1999