US 9,435,620 B2Granted

Flight unit and dart

AssigneeHamada Kousyou Co., Ltd.

InventorsYukio Hamazaki, Katsuo Iguchi

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Abstract

A flight unit in which a flight is connected to a shaft rotatably and without possible wobbling and a dart comprising the flight unit are provided. The flight unit 2 is a part of a dart comprising a shaft 30 and a flight 40. The shaft 30 comprises a shaft body 31, a protrusion 32 provided at one end of the shaft body 31, and a flight connector 34 provided at the tip of the protrusion 32. The flight 40 comprises a hollow cylinder 42 in which the protrusion 32 is slidably fitted, vines 41 at the bases of which the hollow cylinder 42 is provided, and an open cavity 43 adjoining the hollow cylinder 42 and in which the flight connector 34 is slidably fitted. The open cavity 43 is provided to the vines 41 and comprises no exterior walls.

Claims5

Dependent claims

A flight unit that is a part of a dart comprising a shaft and a flight, wherein

the shaft has an axis direction and comprises a shaft body, a protrusion provided at one end of the shaft body, and a flight connector provided at the tip of the protrusion,
the flight comprises a hollow cylinder in which the protrusion is slidably fitted, vines at the bases of which the hollow cylinder is provided, and an open cavity adjoining the hollow cylinder and in which the flight connector is slidably fitted,
the open cavity is provided to the vines and comprises no exterior walls,
the hollow cylinder is provided rotatably with respect to the protrusion of the shaft, wherein
a projection projecting in the axis direction of the shaft where said projection is formed on one of the shaft and the flight, and
a recess, in which the projection is fitted, said recess being formed in either the shaft or the flight.

3 more elements

Dependencies are inferred from the claim text.