| CPC E05B 37/0034 (2013.01) [E05B 37/0048 (2013.01); E05B 37/163 (2013.01)] | 12 Claims |
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1. A code changing structure, applied to a key coded lock;
wherein the code changing structure comprises a lock base, a push rod, two locking pieces, a rotating knob, a linkage assembly, a position resetting assembly, and sets of corresponding key springs, password keys, button springs and buttons;
a top surface of the lock base is provided with a sliding groove, an installing cavity and a plurality of password key slots; the sliding groove is connected to the installing cavity along a lengthwise direction of the lock base; the password key slots are arranged symmetrically in pairs along two sides of the sliding groove;
the push rod is slidably fitted with the sliding groove; two sides of the push rod are respectively provided with a plurality of hooks corresponding to the password key slots;
the two locking pieces are respectively slidably arranged on the two sides of the sliding groove and positioned outside the password key slots; an inner side of each locking piece is provided with a plurality of openings corresponding to the password key slots;
the rotating knob is rotatably fitted inside the installing cavity;
the linkage assembly is assembled on the rotating knob, and drives the push rod and the locking pieces to move axially along with rotation of the rotating knob;
the position resetting assembly is configured to drive the push rod, the locking pieces and the rotating knob to reset to an initial position;
the key springs and the password keys are each fitted inside a corresponding one of the password key slots; upper positioning grooves, lower positioning grooves, and an annular position-limiting groove are provided successively from a top to a bottom on a peripheral surface of each password key; the upper positioning grooves and the lower positioning grooves are arranged in a staggered manner by orienting differently by an angle of difference on a circumferential plane of each password key; when each password key is pressed, the annular position-limiting groove of each password key is hooked by a corresponding one of the hooks of the push rod to stop the password key from bouncing up; when a correct password key of the password keys is pressed, the upper positioning grooves of each correct password key allow an axial movement of a corresponding locking piece of the locking pieces; when an incorrect password key of the password keys is not pressed, the lower positioning grooves thereof of each incorrect password key allow an axial movement of the locking piece; a corresponding button spring and a corresponding button are successively fitted on a top end of each password key; a press-rotating mechanism is provided between each button and each corresponding one of the password key slots to drive a corresponding one of the password keys to rotate; a code-changing height of each button is preset; when each button is pressed to a position below the code-changing height, the press-rotating mechanism thereof is triggered to rotate the corresponding one of the password keys so as to change a password of the key coded lock;
after entering a correct password using correct password keys, the rotating knob is rotatable; a first angle and a second angle of rotation of the rotating knob are preset; when the rotating knob rotates to the first angle, the key coded lock is in an unlocked state, in which the locking pieces move away from the rotating knob and prevent the buttons from being pressed to the code-changing height when being pressed; when the rotating knob rotates to the second angle, the locking pieces move towards the rotating knob, so that the openings allow movements of the buttons, and the buttons are then able to be pressed to the code-changing height so as to change the password.
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