Cylindrical key and method for its productions

Details Cylindrical key and method for its productions Cylindrical key and method for its productions

1988-05-26

1989-05-23

Wolfe, Robert L.

Locks

Operating mechanism

Key

70408, E05B 2708, E05B 1904

Patent

active

048318531

ABSTRACT:
An improved cylindrical key comprising a key plate having two small fixing protrusions and a leg-shaped extension plate formed at one-side end portion thereof, and a key cylinder having a greater cylinder section provided with a radial elongated hole for receiving said leg-shaped extension plate, a smaller cylinder section provided with a cross slot arranged in alignment with said radial elongated hole for engagement of said side end portion of said key plate, and a communicating with the inner step bore of said cylinder sections for firmly securing said two fixing protrusions when the latter are inserted into said inner step bore through said cross slot, and outwardly bent and rested on the inner step slope wall of said inner step bore.
A method of producing said cylindrical key comprising: uprightly holding said key plate by means of a die base; letting said inner step bore of said cylinder sections of said key cylinder engaged with said fixing protrusions of said key plate, and said wing portion and key portion of said key plate engaged with said elongated hole of said key cylinder; and letting said fixing protrusions outwardly bent and rested on the inner step slope wall of said inner step wall by means of a punch of a press, in order to firmly secure said key cylinder onto said key plate, and to obtain said cylindrical key.

REFERENCES:
patent: 1984202 (1934-12-01), Shinn
patent: 2226355 (1940-12-01), Hofmann

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