Patent ID: 7988161

Claim:
A dolly for moving a grand piano having first and second downwardly extending front legs, the lower ends of which are horizontally spaced apart, one downwardly extending rear leg, the lower end of which is horizontally spaced from the lower ends of the front legs, and a downwardly extending pedal lyre the lower end of which has forwardly extending pedals, said dolly comprising: a central pivot hub, a first elongated fixed length arm having an inner end and an outer end, said inner end thereof being pivotally connected, at a fixed pivot location thereon, to said hub at a first fixed pivot connection point on said hub, the aforesaid pivotal connection between said first arm and said hub constituting the sole pivotal connection therebetween, a second elongated fixed length arm having an inner end and an outer end, said inner end thereof being pivotally connected, at a fixed pivot location thereon, to said hub at a second fixed pivot connection point on said hub which is spaced from said first pivot connection point on said hub, the aforesaid pivotal connection between said second arm and said hub constituting the sole pivotal connection therebetween, a third elongated fixed length arm having an inner end, an outer end, and a longitudinally extending through slot having inner and outer slot ends, said slot being located intermediate said inner and outer ends of said third arm, with said inner and outer slot ends being spaced inwardly from said inner and outer arm ends, respectively, a receptacle located on each of said first, second, and third arms for receiving the lower ends of said first front leg, said second front leg, and said rear leg, respectively, of the grand piano said third arm being pivotally connected, at a selectively variable position along said slot, to said hub at a third fixed pivot connection point on said hub which is spaced from said first and second fixed pivot connection points, to selectively vary the distance between the outer end of said third arm and said selectively variable position along said slot, to thereby selectively vary the distance the outer end of the third arm extends outwardly beyond said hub, to accommodate mounting pianos having differing distances between the lower end of the rear leg and the lower end of the front leg closest thereto, and first, second and third roller assemblies respectively mounted to said first, second and third arms operatively effective to facilitate horizontally moving said grand piano positioned on said dolly to selectively variable locations of a surface.