To provide a hinge for a piano capable of positively preventing the slip-off of a shaft core even when the piano is used for a long period of time, and to provide a method of manufacturing such a hinge for the piano efficiently at a low cost.
This hinge 1 for the piano comprises a pair of blade parts 2, 2 each having a plurality of curled bearing parts 5 spaced from each other, at one end so that the plurality of bearing parts 5 of both blade parts are engaged with each other, and the shaft core 3 inserted in the plurality of bearing parts 5 of the pair of blade parts 2, 2 to turnably connect the pair of blade parts 2. The outer peripheral surface of the shaft core 3 is provided with protrusions 6 engaged in a state of biting into the inner peripheral surface of at least one of the plurality of bearing parts 5 of one of the pair of blade parts 2, 2.
JPS52131964A | 1977-11-05 | |||
JPH0354576U | 1991-05-27 | |||
JPH01138078U | 1989-09-21 | |||
JPS61123173U | 1986-08-02 | |||
JPS4932063U | 1974-03-20 | |||
JPS3928832B1 |