Back to results
US 4,743,039 AGranted
Grand piano action cradle
OwnerJames F. Ellisinventor
Life of this patent
Estimating the term…
Abstract
The invention comprises a pair of horizontal runners held above a foldable X-frame dolly by means of adjustable vertical supports to provide placement of the tops of the runners at the exact height of the action bed of a grand piano to allow the piano's action to be drawn directly out upon the runners, supported by the assembly, and moved about for servicing without the need of ever lifting the action, and to be re-installed in the piano in the same manner.
Claims1
In a device for supporting the action of a grand piano, a combination comprising
- two crossed horizontal members supported at their four ends by casters, pivoted at their common centers by a bolt, and having threaded flanges attached to their upper surfaces,
- four vertical supports of tubular material having threaded collars at their lower ends mating with said threaded flanges,
- four threaded studs each extending from the upper end of one of said supports, held in place by a tension spring engaged between an eye in the lower end of said threaded stud and a pin inserted through a hole near the lower end of said support, and restrained from fully entering said support by a nut threaded upon said threaded stud and pressing against said upper end of said support, and
- two horizontal runners with blind holes in their lower surfaces spaced and fitting over the tops of said studs when said crossed horizontal members are pivoted in an open position.
1 more element
Dependencies are inferred from the claim text.