A resettable combination lock, comprising
- (a) an outdoor member secured on a front side of a door, the outdoor member including:
- (1) a housing having a knob thereon;
- (2) a plurality of spaced main buttons passed through a front portion of the housing;
- each main button including an engaging stick, and a ring formed with recesses on a rear side thereof;
- the rings being positioned around respective ones of the rings such that the sticks can cause rotational movement of the rings together with them;
- each engaging stick having a middle portion formed with both first and second trenches, which face opposite directions, and which are different distances from a rear end of the engaging stick;
- each engaging stick having an annular protrusion in front of the first and the second trenches thereof;
- (3) a restoring button passed through the front portion of the housing, used for restoring the lock to an original condition, in which all of the main buttons are away from depressed position and project out from the front side of the housing;
- the restoring button being formed with a slope on a rearwards portion thereof;
- (4) a fixed seat positioned next to a rear side of the front portion of the housing;
- the fixed seat having a plurality of holes, through which the main buttons are respectively passed;
- the fixed seat having locating protrusions next to edges of the holes thereof on a front side for fitting the recesses of the rings respectively;
- (5) a first restoring seat positioned next to a rear side of the fixed seat in the housing;
- the first restoring seat having a first hole on a first end, through which the restoring button is passed;
- the first restoring seat having a plurality of second holes, through which the engaging sticks of the main buttons are respectively passed;
- the first restoring seat having a sloping portion facing and near to the slope of the restoring button;
- the first restoring seat being equipped with plural springs at the first end thereof;
- the first restoring seat having a plurality of second locating posts next to the second holes on a rear side;
- torsion springs being fitted onto respective ones of the second posts and pressed against lateral wall portions of the first seat and corresponding engaging sticks of the main buttons at two ends thereof;
- (7) a second restoring seat positioned next to the first restoring seat in the housing;
- the second restoring seat having a plurality of holes, through which the engaging sticks of the main buttons are passed;
- the first and the second restoring seats being connected such that they are co-movable together with each other;
- (8) a pushing plate positioned next to the second restoring seat in the housing;
- the pushing plate having two slots lengthwise extending along it, through which the engaging sticks of the main buttons are passed;
- edges of the slots being formed with spaced apart concavities and straight portions between adjacent ones of the concavities;
- the pushing plate being biased away from a first end by means of springs connected to the first end thereof;
- the concavities of the pushing plate being going to face corresponding ones of the engaging sticks of the main buttons when the springs thereon are free to stretch without compressing force exerted thereon;
- the pushing plate having a pushing protrusion, which is pressed against the first and the second restoring seats;
- the knob of the outdoor member being connected to a dead bolt as well as the pushing plate such that the knob can be turned to cause linear displacement of the pushing plate, providing that the pushing plate is free to move without being stopped by the engaging sticks of the main buttons, and such that the dead bolt will be linearly displaced relative to the housing when the knob turns;
- (9) a rear seat disposed next to the pushing plate;
- the rear seat having two rows of spaced holes, each of which rows face a respective slot of the pushing plate;
- springs being respectively held in the holes of the rear seat, and pressed against the engaging sticks of the main buttons for biasing the sticks forwards;
- and
- (b) an indoor member secured on a rear side of the door;
- the indoor member having a handle thereon;
- the indoor member including a plurality of actuating sticks for resetting the lock;
- the actuating sticks being respectively securely connected to the engaging sticks of the main buttons for causing angular displacement of the engaging sticks;
- the pushing plate being going to be stopped from moving by those of the main buttons whose first trenches face outwards when the buttons are in non-pressed position, which first trenches won't be exactly faced with the edges of the slots of the pushing plate unless the buttons are pressed;
- the pushing plate being not going to be stopped by those of the main buttons whose second trenches face outwards when the buttons are in non-pressed position, which second trenches will be exactly faced with the edges of the slots of the pushing plate until the buttons are pressed;
- whereby the lock will be unlocked, and the pushing plate movable as soon as the main buttons are pressed exactly according to an unlocking combination;
- and
- whereby the lock can be reset in combination by means of turning the actuating sticks one hundred and eighty degrees such that the first and the second trenches of the engaging sticks of the main buttons change in directions.