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I know this is an old thread, so I am sorry for a late response. But as it's a genuine safety concern, I wanted to make a some observations, from working with pianos for years.
One person comments here on upright pianos having a low centre of gravity. Another refers to not having ever encountered a case of a toppling piano. I'd like to comment on those two things, and to add some general observations.
In 2014 I came across two cases of toppled pianos within a space of six months, and I've known of other instances in the past. The second of the two in 2014 happened, curiously, within the few days when I was waiting for safety Rear Toe castors to arrive, which I had ordered for that very piano. I have written this up, with photographs, on the relevant page of my website and will give the link in a minute. It was in a church community hall used by various community groups, and in fact it fell on the minister's foot, though happily he seems to have been wearing sturdy shoes.
Upright pianos do NOT have a low centre of gravity. Next time you are beside one - and making sure you have someone else with you - try this: Simply push the piano at its front top edge (assuming it is not against a wall). See what happens! The second person should be alert to catch and stop it. (This is assuming it is not already fitted with Rear Toe Safety Castors in which case it will not topple).
In school halls and community halls used by scouts, Boys Brigade etc, you have eager lads willing to demonstrate their strength and helpfulness, but without necessarily knowing what they are doing. It is really very easy for them to topple a piano. An upright piano is extremely heavy and if a young child got in the way, could cause serious injury in falling.
Like others here, I'm not aware on any piece of legislation specific to pianos, but I am sure plenty of regulations concerning the 'Duty of Care' could be applied.
There are two kinds of safety castor arrangement for upright pianos: Rear Toe Castor sets (two plain sturdy front castors and two on heavy brackets for the back), and Cradle Bracket Castors. Both types are shown on my web site. The Rear Toe Castor sets are for traditional style piano case with front legs and 'feet'. Cradle Bracket Castors are for smaller pianos having plain fronts without legs and feet.
It is important to use the right type of castor. Cradle Bracket Castors sometimes get inappropriately fitted to larger uprights with legs (I am thinking of new pianos in two schools near me) and they are really not suitable for this. Barrie Heaton, who also has info on his website and who supplies castors, comments on this, as I do on my site. Tradtional style pianos with Cradle Bracket Castors fitted do not move well and are wobbly in playing.
There is an unfortunate tendency for willing local volunteers to source castors of some kind from local hardware shops, and these are not suitable. They don't work well and are dangerous on pianos. It has really GOT to be 'proper' piano safety ccastors or the correct type. They are expensive, but so might be a lawsuit.
For fitting, I an other technicians use an Uptight Piano Tilter, which enables one operators to put the piano on its back safely (see pics).
Another aspect to having the correct castors, is that it avoids damage to high quality flooring. Often the original castors on a piano are mean little steel things, and as well as the risk of toppling, the are hard to actually move, and they mark the floor.
Anyway, for a fairly comprehensive and well-illustrated discussion of all this, go to http://www.davidboyce.co.uk/piano-castors.php
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