AU2002100087A4

AU2002100087A4 - A lock structure for a safety door

Info

Publication number: AU2002100087A4
Application number: AU2002100087A
Authority: AU
Inventors: Yueh-Chiao Hsu
Original assignee: LOCK AND KEY Manufacturing CO Ltd
Current assignee: Lock & Key Manufacturing Co Ltd
Priority date: 2002-02-05
Filing date: 2002-02-05
Publication date: 2002-04-18
Anticipated expiration: 2010-02-05

Description

AUSTRALIA

Patents Act 1990

ORIGINAL

COMPLETE SPECIFICATION INNOVATION PATENT Invention Title: "A LOCK STRUCTURE FOR A SAFETY DOOR" The following statement is a full description of this invention, including the best method of performing it known to me/us: TITLE: A LOCK STRUCTURE FOR A SAFETY DOOR The present invention relates to a lock structure, and in particular, to a lock structure for a safety door which prevents the lock structure from damage by burglar.

Figs. 1 and 2 show structure of a conventional lock for safety doors which comprises a base seat A, two lockers B, a linked shaft C, a transmission block D, and an engaging latch E. The interior of the base seat A contains a plurality of sleeves Al and bolts A2 for mounting, and the two sides of the base seat A are provided with two slots for the engagement of the lockers B which are fastened by using two pegs A3. The linked shaft C is mounted to the base seat A, and the center of the linked shaft C has a protruded-shaped slot for the mounting of the transmission block D, and the contact face of the linked shaft C and the transmission block D is provided with a spring D1 for restoration of the transmission block D.

The bottom end of the linked shaft C and the engaging latch E are connected with a peg C3, and a peg El is used to mount the engaging latch E onto the base seat A such that the engaging latch E can have an angle change with respect to the peg El. Thus, when the key F rotates within the locker, the locker will drive the transmission block D, and the transmission block D will push the linked shaft C which drives the engaging latch E. Via the peg El, the engaging latch E changes to another angle and the locking and unlocking of lock structure is achieved.

The drawbacks of the conventional lock structure are that the structure is too complicated and there are too many components used to form the lock structure, as a result mechanical faults are frequently occurred. In addition, the lock structure can be easily damaged by burglars, as there are no other components within the lock structure to prevent the lock from damages by sawing.

Accordingly, it is an object of the present invention to provide a lock structure for a safety door, which mitigates the above drawbacks.

Yet another object of the present invention is to provide a lock structure for a safety door, wherein the structure of the lock is simple and mechanical faults to the lock structure are avoided.

A further object of the present invention is to provide a lock structure for a safety door, wherein the handle mounting to the lock structure can be changed in accordance with the needs of the user.

An aspect of the present invention is to provide a lock structure for a safety door comprising a base seat, an actuation plate, a transmission shaft and an engaging latch. The base seat includes a base plate and a locking plate, and the locking plate is provided with a slot engageable with a locker. The rear side of the locker is the actuation plate, which is a T shape. The lower section of the actuation plate is the transmission shaft and the top end of the transmission shaft has a slot which drives the actuation plate to move. The center of the transmission shaft is a through hole for the engagement with a handle. The lower section of the transmission shaft is connected to the engaging latch and a protruded shaft is used to mount the latch to the base seat.

The engaging latch includes a body and a substantially rectangular plate as an anti-burglar plate. A through hole is provided to the body and a peg is used to mount the engaging latch to the base seat so that the engaging latch can move with a certain angle. When a key is inserted into the locker and rotates the locker, the actuation plate at the rear end of the locker is driven to move.

As the transmission shaft and the engaging latch are connected, the engaging latch is driven to a certain angle, and thus locking and/or unlocking of door is achieved.

Other object and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawing.

Fig. 1 is a perspective exploded view of a conventional door lock structure.

Fig. 2 is schematic view showing the action of a conventional door lock structure.

Fig. 3 is a perspective exploded view of a door lock of the present invention.

Fig. 4 is a schematic view showing the action of the door lock of the present invention.

Fig. 5 shows a perspective view of the door lock of the present invention.

Fig. 6 is a preferred embodiment in accordance with the present invention.

Fig. 7 is another preferred embodiment in accordance with the present invention.

Referring to Figs. 3, 4 and 5, there is shown a lock structure for a safety door comprising a base seat 1, an actuation plate 2, a transmission shaft 3, and an engaging latch 4, wherein the base seat 1 includes a base plate 11 and a locking plate 12, and a plurality of sleeves 13 and bolts 14 are used to fasten the two plates 11 and 12. On the top portion ofthe locking plate 12, a slotis provided for mounting with a locker 15, and the rear end of the locker 15 is mounted with a triggering plate 2 being a T-shaped structure. The lower section of the actuation plate 2 is linked to a transmission shaft 3, and the top end of the transmission shaft 3 has a slot 31 for the driving of the actuation plate 2. The center of the transmission shaft 3 is a through hole 32 for the insertion ofa handle 5 of a door. The two sides of the through hole 32 are protruded slightly above the transmission shaft 3, facilitating the mounting of the transmission shaft 3 onto the base seat 1. The lower section of the transmission shaft 3 is connected to the engaging latch 4, and a protruded shaft 33 passes through the transmission shaft 3 and is mounted to the base seat 1.

The two ends of the base seat 1 are provided with slots 16 corresponding to the protruded shaft 33. The slot 16 allows the protruded shaft 33 to move around therein. The engaging latch 4 includes a body 41 and a substantially rectangular plate 42 being the anti-burglar component/plate, and a through hole 411 is provided on the body 41. Apeg 43 is used to mount the engaging latch 4 onto the base seat 1, and the other end of the peg 43 is a C-shaped ring 44 to mount with the peg 43 so that the engaging latch 4 can move from one angle to another. A slot 421 is provided at the center of the plate 42 and contains a cylindrical protrusion 422 smaller than the slot 421. The function of the cylindrical protrusion 422 is that when the engaging latch 4 is saw, at the stage when the saw touches the cylindrical protrusion 422, the cylindrical protrusion 422 will rotate as a result of its smaller size. Thus, it effectively prevents the lock structure from damages by burglars by sawing the lock.

Referring to Figs. 5, 6 and 7, when a key 6 is inserted into the locker and the key 6 rotates the locker 15, the locker 15 rotates to drive the actuation plate 2 located behind the locker 15. When the T-shaped section of the actuation plate 2 is at the slot 31 of the transmission shaft 3, the plate 2 will drive the transmission shaft 3. At this moment, the protruded shaft 33 between the transmission shaft 3 and the engaging latch 4 slides within the slot on the base seat 1. When the protruded shaft 33 is at the highest point and at the lowest point, the protruded shaft 33 is fastened at this point as a result of the slot 31 so as to prevent the engaging latch 4 from being loosen and losing its function. Due to the fact that the transmission shaft 3 is connected to the engaging latch 4, when the engaging latch 4 rotates to an angle, the function of door locking or unlocking is obtained.

In accordance with the present invention, the advantages of the door lock structure are as follows: The structure of the door lock is simple and mechanical fault is low.

The engaging latch will not be dislocated as a result of the guiding slot.

The door handle can be modified to comply with the requirements of the user.

An anti-burglar structure is provided to the engaging latch, and therefore the engaging latch is prevented from damages.

While the invention has been described with respect to preferred embodiments, it will be clear to those skilled in the art that modifications and 7 improvements may be made to the invention without departing from the spirit and scope of the invention. Therefore, the invention is not to be limited by the specific illustrative embodiment, but only by the scope of the appended claims.

Claims

1. A lock structure for a safety door having a base seat, an actuation plate, a transmission shaft and an engaging latch, characterized in that the transmission shaft is connected to the engaging latch by a protruded shaft such that when the actuation plate rotates, the transmission shaft is driven to move, and the engaging latch changes from one angle to another angle.

2. The lock structure of claim 1, wherein the engaging latch includes a body, and a plate having a slot and the center thereof and containing a circular cylindrical body.