This lock is a kind use technically at window of door of steel of push-pull type model, do not need the lock of completely mechanical password that the key can open. The set of password of type of two groups of buoy in the lock bolts but aleatoric set code, password set limits is great. The operating sequence that this password locks up understands easily very simply, the person that suit the old people in the family or amblyopia particularly is used. Because this lock is,be together window and window frame or door and doorcase lock, bolt is concealed in window frame or in doorcase, cannot undertake tearing open directly so, prize, be bungled etc destroy a method, achieved safe burglarproof goal. In the meantime, this lock still has the effect of door window shake handshandle, the person that went to the lavatory to use greatly.

Patent date: ZlZL200420029505.2

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