Musical instruments comprising tuned spherical cap bells that are individually mounted a framework to provide unique play opportunities. The spherical cap bells are tuned by controlling the height of the bell, by producing a thinned wall area that extends upward from the bottom edge, or both. The musical instruments may be configured to have a playful and recognizable appearance, such as for instance a caterpillar. The musical instruments may also be configured for installation in an outdoor environment.

Musical instruments comprising tuned spherical cap bells that are individually mounted a framework to provide unique play opportunities. The spherical cap bells are tuned by controlling the height of the bell, by producing a thinned wall area that extends upward from the bottom edge, or both. The musical instruments may be configured to have a playful and recognizable appearance, such as for instance a caterpillar. The musical instruments may also be configured for installation in an outdoor environment.

A musical bar for a musical instrument includes a striking surface and a back surface which is a back side of the musical bar from the striking surface. When the striking surface is struck, the musical bar is vibrated to produce a musical tone with a unique pitch as a pitch of a fundamental tone. A recess is formed in the musical bar so as to be recessed from the back surface toward the striking surface. A position of a node of vibration of the fundamental tone for the musical bar is substantially aligned with an imaginary center of gravity of the recess in a longitudinal direction of the musical bar.

A musical bar for a musical instrument includes a striking surface and a back surface which is a back side of the musical bar from the striking surface. When the striking surface is struck, the musical bar is vibrated to produce a musical tone with a unique pitch as a pitch of a fundamental tone. A recess is formed in the musical bar so as to be recessed from the back surface toward the striking surface. A position of a node of vibration of the fundamental tone for the musical bar is substantially aligned with an imaginary center of gravity of the recess in a longitudinal direction of the musical bar.

According to an aspect of the present invention, there is provided a door knocker, comprising: a mounting plate; a cleat; a hinge attached to the cleat; and an ornament attached to the hinge configured to knock against the mounting plate and cleat.

According to an aspect of the present invention, there is provided a door knocker, comprising: a mounting plate; a cleat; a hinge attached to the cleat; and an ornament attached to the hinge configured to knock against the mounting plate and cleat.

An intelligent singing bowl includes a base, a sound production element, a supporting element, a knocking element and a driving element. The sound production element is connected to an upper surface of the base. The supporting element is connected to the base and extends upwards from the base. A bottom end of the knocking element is located on one side of the sound production element. The driving element is located inside the supporting element; the driving element includes a rotating shaft, an electromagnetic clutch, and a motor; a top end of the knocking element is rotatably connected to a middle of the rotating shaft; the electromagnetic clutch and the motor are respectively connected to two ends of the rotating shaft; the electromagnetic clutch attracts or releases the rotating shaft; when the electromagnetic clutch attracts the rotating shaft, the rotating shaft is fixedly connected to the knocking element.

An intelligent singing bowl includes a base, a sound production element, a supporting element, a knocking element and a driving element. The sound production element is connected to an upper surface of the base. The supporting element is connected to the base and extends upwards from the base. A bottom end of the knocking element is located on one side of the sound production element. The driving element is located inside the supporting element; the driving element includes a rotating shaft, an electromagnetic clutch, and a motor; a top end of the knocking element is rotatably connected to a middle of the rotating shaft; the electromagnetic clutch and the motor are respectively connected to two ends of the rotating shaft; the electromagnetic clutch attracts or releases the rotating shaft; when the electromagnetic clutch attracts the rotating shaft, the rotating shaft is fixedly connected to the knocking element.

An intelligent singing bowl includes a base, a sound production element, a supporting element, a knocking element and a driving element. The sound production element is connected to an upper surface of the base. The supporting element is connected to the base and extends upwards from the base. A bottom end of the knocking element is located on one side of the sound production element. The driving element is located inside the supporting element; the driving element includes a rotating shaft, an electromagnetic clutch, and a motor; a top end of the knocking element is rotatably connected to a middle of the rotating shaft; the electromagnetic clutch and the motor are respectively connected to two ends of the rotating shaft; the electromagnetic clutch attracts or releases the rotating shaft; when the electromagnetic clutch attracts the rotating shaft, the rotating shaft is fixedly connected to the knocking element.

An intelligent singing bowl includes a base, a sound production element, a supporting element, a knocking element and a driving element. The sound production element is connected to an upper surface of the base. The supporting element is connected to the base and extends upwards from the base. A bottom end of the knocking element is located on one side of the sound production element. The driving element is located inside the supporting element; the driving element includes a rotating shaft, an electromagnetic clutch, and a motor; a top end of the knocking element is rotatably connected to a middle of the rotating shaft; the electromagnetic clutch and the motor are respectively connected to two ends of the rotating shaft; the electromagnetic clutch attracts or releases the rotating shaft; when the electromagnetic clutch attracts the rotating shaft, the rotating shaft is fixedly connected to the knocking element.