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>>>>Can anyone tell me what the previous recommendation for “a 5-leg star base” was based on? The current Australian Standard AS/NZS 4438 (1997) merely refers to various performance tests for stability. As I remember, that came from German DIN standards in the 1970’s. I believe they based their guideline on Ahmet Cakir’s “The VDT Manual”, written in the 1970’s. Cakir reasonably argued is that it was less likely to tip in one’s seat. It was very controversial at the time since this effectively knocked out the furniture competition from other countries but eventually it became common practice. That was where the lower profile keyboards came from. Cakir wrote it should be “as flat as possible”, and DIN incorporated it. After IBM spent many years churning out study after study showing people liked tilt-up keyboards, they eventually gave up and (unfortuntely) settled with the tilt-up keyboard legs that we have become accustomed to. By the by, I have always found that one a little intriguing as we were always taught in geometry that 3-leg tripod is the most stable configuration that is possible for a stable base.
Doesn’t this also apply to chairs? I have noticed that restaurants almost invariably provide a wobbly 4-leg flat base – perhaps it is time that the design of that restaurant tables caught up with the laws of basic geometry! WorkCover Authority of New South Wales I think the office chair’s function is different from that of the restaurant or even household chair. The office chair has to provide for a lot of movement and with casters in use, the five-star base is the most stable. If you have any doubt, try reaching for something across your desk in a four-point chair and then a five-point chair . oh, and watch your head when the four-point chair starts slipping from underneath you. The restaurant chair simply provides a base on which to seat with the expectation that you don’t move around a lot. Note that you don’t see very many “simple” chairs with five legs. Geometrically the 3 legged base is the most stable, but not to support dynamic loads. Every chair designer has attempted a 3 legged chair like Frank Lloyd Wright as well as Charles Eames.
All have failed functionally, but they sure looked good. The 3 legged chair is only successful when the legs are far apart requiring an enormous amount of real estate for them to function in. That is not acceptable in the office world. George Nelson’s Coconut chair is stable, but it is a lounge chair. The 4 legged star pedestal base proved to be unstable when people started falling out of them. Insurance companies created the inspiration to move to the 5 star base for office chairs. The rest is history and is probably not new to you. Dave, I think you need to dig out that old 3 legged stool from your attic and try it out before you put one of your Post Grads in danger. I believe Jack Kelly (above) has got it about right when he said: “The 3 legged chair is only successful when the legs are far apart requiring an enormous amount of real estate for them to function in.” Although we could add that if the seat is fairly low then the legs don’t have to be quite so widely spread.
But then, to work at a desk the seat would have to be at least 45-50cm high and even with a wide spread of the three legs it wouldn’t take much to get your seated C of G outside the balance point. The C of G wuld only have to move about 20cm in any of the 3 directions for it to be over a line between two of the legs – beyond this you are likely to overbalance. The more points to the star-base the further you have to lean to become unstable, but 5 points has to be the max since any more would mean that users would always be banging the wheels against the footrest (if they have one), as opposed to only occasionally with the 5 point base! (For info, the diameters of the star base for the various chairs in my office range from 62 to 66cm, and although it takes considerable effort, as well as improper use of the armrests, I can still tip the 65cm example when reaching too far (without the armrests, I would have fallen out of the chair far earlier)) From my perspective, the swivel feature is important to avoid twisting.
There are many workstation designs where individuals perform different functions at different areas on the work surface(s). These designs could include any station other than one having a straight edge. The swivel allows one to move easily from one task to another, without the twist (in neck, torso). Additionally, some individuals twist when speaking with colleagues, particularly when the door or cubicle entrance is not in-line with their viewing direction. Encouraging the use of the swivel feature, can be beneficial. As for how the swivel affects stability, I haven’t noted that this is a concern. Diane Stinson, M.Sc., CCPE Sorry, Dave – I was trying (and clearly failing) to be mildly amusing with my reference to your supposed milking stool in the attic. Like you though, I have not seen a 3-legged stool in use in office, factory or laboratory in the last 20 years or so. I’m no furniture historian but your timescales and developments appear reasonable to me.
I would though, agree with Diane that the swivel is a valuable chair feature, and I can’t really think of an instability issue resulting from the swivel action (in normal use, that is). That said I believe there is an accident risk with some swivel chairs – one that arises when trying to sit back down without looking….and the seat has rotated slightly! (a particular issue that I found with the original Aeron – perhaps the bearings were just too good). Dave, you say “…after all for maintaining stability the COG only has to be above the base – not above the area between the wheels.” You may be correct in this, but I’m not sure exactly what you mean – in order for the chair to become unstable (i.e. tip over) I believe it is necessary for the CofG to move beyond a balance point above a line between any two adjacent legs (the presence of castors complicates this somewhat, but the principle is true). I’m not sure where we’re going with this, if anywhere, but it may be time for a sketch of your flanged chair to avoid confusion.