Piano trolley
Encyclopedia
A piano trolley is a two- or four-wheeled trolley approximately 0.5m long used by removal
Removal
Removal may refer to:* Removal * Removal jurisdiction in the United States courtsRemoval may also indirectly refer to:* Administrative removal in immigration law* Amputation, removal of a body extremity by trauma or surgery...

s companies for moving pianos. It is placed under the centre of mass of the piano
Piano
The piano is a musical instrument played by means of a keyboard. It is one of the most popular instruments in the world. Widely used in classical and jazz music for solo performances, ensemble use, chamber music and accompaniment, the piano is also very popular as an aid to composing and rehearsal...

 and allows it to be turned on its axis to manoeuvre round a building. By placing the trolley at one end of the instrument stairs may be negotiated. In tight spaces the piano may be turned on end and rested on the trolley.

Typical features include solid rubber tyres, very strong construction, thick rubber bumpers along the top and on the ends.

Before a piano trolley can be used to move a grand piano, the piano must be protected by a piano shoe, a wooden frame which protects the polished surface and provides additional strength for the sides.

There are as many types of piano dollies, as there are pianos. Grand, upright, electronic, etc. and that is before we even mention different brands. You can get a good idea of the different piano dollies http://handtrucks2go.com/Piano-Dolly/ here.
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