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Behind every good tip...
Page 26
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AFILK READING the article on light tippers (CM17 February), I felt compelled to respond. We are the largest suppliers of small underfloor tipping gears to independent bodybuilders in the UK. Since 1993, we have pioneered the use of multistage straight-push cylinders and have supplied over 22.000 to the UK market. A Underfloor tipping gears The comment in the article that a multi-stage cylinder uses its smallest stage first is wrong. The first extension that comes out is the largest stage and, as the article states, it is capable of lifting over four tonnes At this point, the pump is working at low pressure; the pressure will then increase as the cylinder rises and until the load starts to discharge. Rarely does the powerpack need to operate at more than 50% of its potential capacity to discharge a load.
A link frame is driven by a piston that has a surface area similar to that of the first extension of a multi-stage cylinder. A rear-tip multi-stage cylinder usually operates at a mechanical disadvantage of 1.5:1; a link frame typically operates at a disadvantage of 6:1.
Therefore, to tip a two-tonne load, a multi-stage cylinder must start by delivering three tonnes of thrust and a link frame of 12 tonnes. The thrust of the first extension of a multi-stage cylinder is largely irrelevant at it is never used to its full capacity. It does have the twin advantages, however, of being able to compensate for misaligned loads, especially where a fixed toolbox is built into the front of the body, and of acting as a damper when the body comes down without additional control& The multi-stage cylinder is also more versatile than the link, being able to cope with bodies up to 3,800mm.
Also in your magazine, I note the impressive results that Dennison achieved on a tilt test with their latest tipping trailer. I know it is the only test available when it comes to trying to measure tipping stability, but many of us in the industry have voiced concerns that it does not imitate real life.
The test involves lifting a fully loaded body then tilting it over and not the other way round.The dynamic forces of a load moving on unstable or sloping ground cannot be calculated or imitated in test conditions.
I for one would not want to be anywhere near a trailer tipping on a r slope let alone a 100 slope, no matter how good the test results proved to be.
Brian Alcock Underfloor Tipping Gears Gateshead