Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Projectile backstop
Patent
1994-08-05
1996-11-12
Shapiro, Paul E.
Amusement devices: games
Aerial projectile game; game element or accessory therefor...
Projectile backstop
29517, 403165, A63B 6502
Patent
active
055732518
ABSTRACT:
A dart flight stem comprises a metal root portion attached by screw thread to a dart barrel. A flight-holding portion is mounted on the root portion for rotation about the longitudinal axis of the flight stem. A shaft extends axially from the flight-holding portion into a complementary bore extending axially from the adjoining end of the root portion. The shaft has a circumferential groove and the peripheral metal wall in the root portion is locally crimped to form radially inwardly peripheral projections in the circumferential groove around the shaft, whereby the flight holding portion is held captive on said root portion. The dart flight stem made by a method of selecting root portion with screw threads at the front end for attachment to a dart barrel. A flight holding portion is mounted on the rear end of the root portion. An axial blind bore is provided in the root portion to establish a rotating fit with a shaft on the flight holding portion. The shaft is provided with a circumferential groove and inserted into the bore following which crimping of the bore radially inwardly forms a projection in the groove to hold the flight portion captive on the root portion. The root portion is then turning down to remove exterior indentations.
REFERENCES:
patent: 392062 (1888-10-01), Pedersen
patent: 2583474 (1952-01-01), Cozzone
patent: 4353280 (1982-10-01), Spercel
patent: 4842285 (1989-06-01), Farler
Beard Eric
Plummer Gary
Thorburn Christopher
Poff Clifford A.
Shapiro Paul E.
Target Sports Limited
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