Side bar type cylinder lock with variable key code
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United States of America Patent
Stats
-
Jun 29, 2004
Grant Date -
Apr 15, 2004
app pub date -
Feb 4, 2003
filing date -
Oct 15, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
In a side bar cylinder lock with a variable key code, plug (6) engages within casing (1) at two opposite portions in preventing plug (6) from rotating in locking state. This improves the lock in resistance to attack. Plug (6) has holes (8) each receiving a tumbler plate (11) and variable tumbler (14) side by side therein. When plug (6) is rotated to have a bulged portion (21) of said bar holder (19) abut against concave portion (2) of casing (1), spring (25) forces end portion (26) of plate (11) to enter receiving hole (9) of plug (6), and forces a bulged portion (21) of holder (19) to engage with concave portion (2) of casing (1), whereby engaging portion (13) of plate (11) is disengaged from an engaged portion (15) of variable tumbler (14). After such disengagement, variable tumbler (14) is rotated through an angle to change the key code to a new one.
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