| 摘要 |
Small pistons having an improved additional structure for a cylinder safety lock comprising an outer block cylinder (2) and an inner cylinder (3) rotatable within the former. Each composite lower pin (20) of a safety lock comprises a hollow piston (8) and a peg (9) slidably received within the piston, and the upper pins (7) of the outer cylinder are of a magnetic material to attract metal holed disks housed in cylindrical seats (17) of the outer cylinder (2) to automatically replace the opening key (1) with another key (1') having a different profile. |
