Abstract: A lock includes a body, a key-operated core in the body, two spring-biased plates slideable on a recessed portion of the body, and a locking crutch to be fastened to the body with the spring-biased plates. The body has crutch embedding holes on two sides of the core; the core has a plate part, and force is applied to the spring-biased plates through the plate part when the core is turned. The locking crutch has a groove on each of two ends to engage a corresponding plate. The plates are biased to engage the locking crutch when the core is in the locking position; and, the plates are forced to disengage from the locking crutch by turning the lock core to the unlocking position. Saw-resistant pins are inserted in receiving holes formed on a periphery of the lock body to protect the lock against a saw.

Abstract: A lock includes a body, a key-operated core in the body, two spring-biased plates slideable on a recessed portion of the body, and a locking crutch to be fastened to the body with the spring-biased plates. The body has crutch embedding holes on two sides of the core; the core has a plate part, and force is applied to the spring-biased plates through the plate part when the core is turned. The locking crutch has a groove on each of two ends to engage a corresponding said plate. The plates are biased to engage the locking crutch when the core is in the locking position; and, the plates are forced to disengage from the locking crutch by turning the lock core to the unlocking position. Saw-resistant pins are inserted in receiving holes formed on a periphery of the lock body to protect the lock against a saw.

Abstract: A lock includes a lock body, which has a core holding hole in a middle portion, and a lock core fitted in the core holding hole; the lock body has several pin holes on a periphery portion thereof; saw-resistant pins are inserted in the pin holes of the lock body respectively to protect the lock body from being damaged with tools such as a saw; the saw-resistant pins have already undergone heat treatment so as to have increased strength.

Abstract: A lock core reinforced structure device with two different metallic parts comprises a lock sleeve, a revolver and a gate. The lock sleeve provides disposition and combination of the revolver and includes some pin holes providing disposition of upper pinballs, springs and a stop pin. The revolver includes a key channel for insertion of a key and some pin holes providing disposition of lower pinballs. Additionally, the main body of the revolver is made of two different metallic materials combined together, where the front part of it is made of easily machined cast iron or copper and the rear part of it is made of steel material or heat treatment reinforced steel which has more structure strength. Furthermore, a gate room is formed beside an open end of the key channel and provides disposition of a gate and a spring, which is sealed and fixed by a keyhole cover. The gate is constantly pushed by the spring and moves upward to seal the open end of the key channel.

Abstract: A core structure of gun trigger lock comprises two embedded parts. A first embedded part includes a pit and a straight hole; a lock piece and a spring are disposed in the pit; the lock piece, having parallel ratchets formed on one side, is pushed by the spring and moves upward constantly. A second embedded part includes a core rod hole, and a straight core rod is disposed therein; the straight core rod includes a long keyhole at the open end, and a aspheric bump is placed at the bottom of the keyhole; a gear shaft, having parallel ratchets on one side, extends from the straight core rod and can be inserted into the straight hole of the first embedded part. Moreover, a key is also included in the present invention, having an aspheric pit at the front end which matches with the shape of the aspheric bump at the bottom of the keyhole of the second embedded part.

Abstract: An anti-drilling structure of a latch is disclosed. The latch comprises an inner shaft body with a non-circular key hole exposed at the external end face of the inner shaft body, characterized in that the external end face of the inner shaft body is provided with an anti-drill plate, a protrusion and a recess structure is provided between the external end face and the anti-drill plate so that the anti-drill plate can be positioned and cover the external end face of the inner shaft body, thereby when the anti-drilling plate is forced to open or damaged by external force, the anti-drilling plate will rotate and the components at the internal section of the latch are protected from damages.

Abstract: A locker structure which includes two hemispherical shells each correspondingly mounted to each other, each of the hemispherical shells having corresponding locking-core hole, latching hole, lock-hook hole and locking hole, and the lock-latching hole position is provided with a steel bead or lock-latching element, and the lock-latching hole position is a fixing end having a lock-hook, and the locking hole position allows the actuating end of the locking hook to be inserted and to lock the locker, or the two elements are disengaged to unlock the locker, and the exterior of the two hemispherical shells is mounted with a steel sleeve and the position of the top, bottom of the steel sleeve and the two hemispherical shells are disposed with a steel plate such that the steel sleeve and the structure of the steel plate cover the two hemispherical shells to form a locker.

Abstract: An anti-burglar device of a door locker is disclosed. The locker comprises a rotating button, a rotating shaft body, and an external gear, the rotating shaft body being fixed to the rotating shaft body having one end mounted to the external gear, the other end of the external gear provided with an axle having a spring and a sleeve, and the spring urged between the rotating shaft body and the sleeve, the interior of the sleeve provided with internal gear which is engaged with the external gear, the tail end of the axle mounted to a fixing button so that the sleeve cannot be disengaged, whereby in unlocking or locking the locker, a force is applied to move the sleeve so that the inner gear and the external gear are engaged, and the sleeve is turned to unlock or lock the latch of the locker.

Abstract: An anti-burglar device of a door locker is disclosed. The locker comprises a rotating button, a rotating shaft body, and an external gear, the rotating shaft body being fixed to the rotating shaft body having one end mounted to the external gear, the other end of the external gear provided with an axle having a spring and a sleeve, and the spring urged between the rotating shaft body and the sleeve, the interior of the sleeve provided with internal gear which is engaged with the external gear, the tail end of the axle mounted to a fixing button so that the sleeve cannot be disengaged, whereby in unlocking or locking the locker, a force is applied to move the sleeve so that the inner gear and the external gear are engaged, and the sleeve is turned to unlock or lock the latch of the locker.

Abstract: A structure of a locker having two hemispherical shells is disclosed.

Abstract: An improved structure of a torsional force activated latch bolt is disclosed. The latch bolt has a body including a hook hole, a latch hole and a bolt hole, the hook hole allowing the insertion of a buttoning head, the latch hole allowing the mounting with a latch and the bolt hole being provided with a latch bolt and a spring, characterized in that the rear end of the latch bolt is connected with a torsional spring, and the latch bolt is torsionally actuated by the exertion force of the torsional spring such that a notch of the latch bolt is engaged with a circular slot of the buttoning head forming a locking position, or by means of an actuating block of the latch urges the latch bolt to torsionally actuate in a reverse position such that the notch of the latch bolt to disengage from the circular slot of the buttoning head forming an unlocking position.

Abstract: A locking device for the trigger of a pistol is disclosed, and comprises a first and a second clipping seat, wherein the first clipping seat is provided with a hollow slot having a stopping block being mounted with a plurality of ratchet wheels. The second clipping seat is provided with a locking seat and a geared-shaft with a plurality of ratchet wheel. The first and the second clipping seat can combined together and the geared-shaft is inserted within the hollow slot. The clipping seats mount to the trigger and the trigger guard of a pistol from the lateral side thereof, so that the pistol trigger cannot be operated if the locking device is at the locking position.