GB2466665A

GB2466665A - Lock having auxiliary drive member to increase the throw distance of the lock bolt

Info

Publication number: GB2466665A
Application number: GB0900108A
Authority: GB
Inventors: Tien-Kao Liu
Original assignee: Federal Lock Co Ltd
Current assignee: Federal Lock Co Ltd
Priority date: 2009-01-06
Filing date: 2009-01-06
Publication date: 2010-07-07
Also published as: GB0900108D0

Abstract

A lock assembly includes a lock case 1 containing a latch unit 3 and a lock bolt unit 4, a cover plate 2, a handle for controlling the latch unit, and a core unit 5 for controlling the latch unit and the lock bolt unit independently. The lock bolt unit 4 includes an intermediate member 45 for transmitting driving movement of the lock core 5 to a lock bolt 41. The transmission block 45 has a protrusion 454 which slides in arc guide slot 23; protrusions 452, 453, engage with the lock core, e.g. by a rotating cam 51, and protruding pin 424 of the lock bolt is engaged within groove 451 of the transmission block 45. The intermediate driving member 45 increases the distance over which the lock core is operationally engaged with the bolt and thus increases the throw distance of the bolt such that it extends further from the door edge and provides a more secure lock. A sprung stop plate 43 having bolt engaging protrusion 434 cooperates with either recess 421, 422, on the bolt to retain the bolt in the retracted or extended positions. Auxiliary pushing member 44 is guided by protrusion 423 in slot 441 and pin 442 in L-shaped slot 21 for engaging latch moving plate 39 in order to retract the latch 31. The latch unit 3 may have a sprung loaded adjustment rod 32 enabling the latch 31 to be rotated to suit a door opening in either direction.

Description

LOCK ASSEMBLY

FIELD OF THE INVENTION

The present invention generally relates to a lock assembly, and more particularly to a lock assembly capable of rotating a latch clockwise and counterclockwise to improve the lock adaptability and increase the external length of a lock bolt beyond the lock in order to extend the lock bolt deep into the door stop to improve the anti-theft function.

BACKGROUND OF THE INVENTION

In general, a lock is installed onto a door panel to achieve the anti-theft effect.

With reference to FIGS. 1 and 2 for the components and the assembly of a conventional lock, the lock comprises a lock case 10 and a cover plate 20. The lock case 10 is fixed onto a lock case panel 101 and contains a latch unit 30 and a lock bolt unit 40, wherein the latch unit 30 includes a latch 301 and a latch pin 302. The latch pin 302 has an abutting portion 3021 and a rod 3022, and a sunken area 3023 is formed on an external surface of the abutting portion 3021. After the rod 3022 is passed through a latch pin compression spring 303, a latch bracket 304 and a latch compression spring 305, coupled with the latch 301 and fixed into a latch pin guider 102 of the lock case 10. The latch pin compression spring 303 will be situated between the latch bracket 304 and the abutting portion 3021 of the latch pin 302. The latch compression spring 305 will be situated between the latch bracket 304 proximate to an internal wall of the latch 301 and the latch pin guider 102. The extended pushing force of the latch compression spring 305 drives the latch 301 to protrude out from the lock case panel 101. The lock case 10 has a through hole 103 disposed on a sidewall of the lock case 10 and corresponding to the abutting portion 3021 of the latch unit 30. The latch unit 30 further comprises an auxiliary hole block 306 for the installation of the internal and external handles (not shown in the figure).

A flange 3061 protrudes from an external edge of the auxiliary hole block 306 and a recession 3062 is concavely disposed on the auxiliary hole block 306 for insertion of a push pin 307. A push pin compression spring 308 is sheathed onto the push pin 307 and a push pin guider 104 is abutted against another end of the push pin compression spring 308. Another end of the push pin 307 is passed out from the push pin guider 104. In addition, an auxiliary moving plate 309 is sheathed axially with the auxiliary hole block 306, and a groove 3091 is concavely disposed at a wall of the through hole of the auxiliary moving plate 309. The flange 3061 of the auxiliary hole block 306 is situated in the groove 3091 and a protruding handle 3092 is protruded from the top of the auxiliary moving plate 309 and situated between the latch pin guider 102 and an internal wall on another side of the latch bracket 304. A protruding ear 3093 is protruded from the bottom of the auxiliary moving plate 309. The lock bolt unit 40 comprises a lock bolt 401, a transmission plate 402 fixed to an end of the lock bolt 401, a transverse slide slot 4021 disposed on the transmission plate 402, first and second bolt notches 4022, 4023 concavely disposed on the top edge of the plate, a turning slot 4024 concavely disposed at the bottom edge of the plate, a stop plate 403 installed at the rear of the transmission plate 402 and having a longitudinal primary position limit slot 4031 disposed on the stop plate 403 and corresponding to a slide slot 4021 of the transmission plate 402, and a longitudinal secondary position limit slot 4032 disposed separately on both sides of the primary position limit slot 4031, a protruding plate 4033 protruded from the top of the stop plate 403, and sheathed with a conical compression spring 4034, and a conical spring stopper 105 abutted against the top of the conical compression spring 4034. The top of the protruding plate 4033 is extendd out from the conical spring stopper 105, and a bolt member 4035 is protruded from another end of the top of the stop plate 403. The conical compression spring 4034 is pushed to latch the bolt member 4035 into the first bolt notch 4022 of the transmission plate 402. The lock case 10 contains a fixing pillar 106 and two stop pillars 107, and the stop plate 403 and the transmission plate 402 are installed in the lock case 10. The position pillar 107 is inserted into the secondary position limit slot 4032 of the stop plate 403, and the fixing pillar 106 is inserted into the primary position limit slot 4031 of the stop plate 403 and the slide slot 4021 of the transmission plate 402. In addition, an auxiliary pushing member 404 is disposed at the front of the transmission plate 402, and the auxiliary pushing member 404 has a pair of guide slots 4041 facing towards a surface of the transmission plate 402. A pair of protruding dots 4025 are disposed on a surface of the transmission plate 402 and embedded into the guide slot 4041. The auxiliary pushing member 404 includes a protruding dot 4042 facing a surface of the cover plate 20 and embedded into the position limit slot 201 on an internal side of the cover plate 20. A cover plate protecting sheet 202 is disposed on an external side of the cover plate 20. The lock includes a core unit 50 disposed at an appropriate position below the lock bolt unit 40 and having a cam 501.

The operation methods of the aforementioned lock is mainly divided into two modes "Handle Operation" and "Lock Core Operation" as described below: 1. Handle Operation: In FIG. 3, if the handle 60 is operated to turn downward, the handle 60 will drive the auxiliary hole block 306 and the auxiliary moving plate 309 to rotate synchronously. The auxiliary hole block 306 will push the push pin 307, so that an end of the push pin 307 can be extended further out from the push pin guider 104, and the push pin compression spring 308 is compressed. In addition, the protruding handle 3092 of the auxiliary moving plate 309 pushes the latch bracket 304 to displace in a direction towards the abutting portion 3021 of the latch pin 302, such that the latch compression spring 305 is also compressed. Therefore, the latch pin 302 will drive the latch 301 to displace in a direction towards the abutting portion 3021 synchronously, and the latch 301 is retracted into the lock case 10 to define an unlocked state of the lock. On the other hand, if the handle 60 is released, the push pin compression spring 308 will resume its extension to push the auxiliary hole block 306 to turn, and the latch compression spring 305 will resume its extension to push the latch bracket 304 together with the latch pin 302 and the latch 301 for a synchronous displacement. The latch 301 will be extended out from the lock case panel 101 to resume a locked state of the lock as shown in FIG. 2.

2. Lock Core Operation: 1. Lock Core Operating Latch: In FIG. 4, if the cam 501 of the core unit 50 is operated to rotated in a direction towards the lock bolt 401, and the cam 501 will 3..

push the auxiliary pushing member 404 to displace upward, such that the auxiliary pushing member 404 pushes the protruding ear 3093 of the auxiliary moving plate 309, and the auxiliary moving plate 309 produces a rotation, and the protruding handle 3092 pushes the latch bracket 304 to displace in a direction towards the abutting portion 3021 of the latch pin 302 synchronously. For now, only the latch compression spring 305 is compressed, so that the latch pin 302 will drive the latch 301 to displace in a direction towards the abutting portion 3021 synchronously, and the latch 301 is retracted into the lock case 10 to define an unlocked state of the lock.

On the other hand, if the external force for rotating the cam 501 is released, then the latch compression spring 305 will resume its extension to push the latch bracket 304 together with the latch pin 302 and the latch 301 for a synchronous displacement, and the auxiliary moving plate 309 will be pushed and turned by the latch bracket 304, and the protruding ear 3094 will be used for pushing the auxiliary pushing member 404 to displace downward, such that the latch 301 will be extended out from the lock case panel 101 again to resume a locked state of the lock as shown in FIG. 2.

2. Lock Core Operating Lock bolt: In FIGS. 5 to 7, if the cam 50 for operating the core unit 50 is rotated in a direction away from the lock bolt 401, the cam 501 will push the stop plate 403 to displace upward, so that the bolt member 4035 is lifted to separate from the first bolt notch 4022 of the transmission plate 402 to compress the conical compression spring 4034 to a compressed state, and then the cam 501 will enter into a turning slot 4024 of the transmission plate 402 (as shown in FIG. 5), and then the transmission plate 402 together with the lock bolt 401 are pushed to displace transversally and synchronously, so that the lock bolt 401 will be expended out from the lock case panel 101 (as shown in FIG.6). If the cam 501 is separated from the turning slot 4024 of the transmission plate 402, the conical compression spring 4034 will resume its extension to push the stop plate 403 to displace downward, and the bolt member 4035 of the stop plate 403 will be descended and latched into the second bolt notch 4023 of the transmission plate 402 to define a locked state of the lock as shown in FIG. 7. On the other hand, if the cam 501 is operated to rotate in an opposite direction, then the stop plate 402 will be

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lifted to drive the transmission plate 402 and the lock bolt 401 for a synchronous displacement, and the lock bolt 401 will be retracted into the lock case 10 to resume an unlocked state of the lock as shown in FIG. 2.

In addition, the lock concurrently has the function of changing the direction of the latch 301. In FIG. 8, a user simply passes a tool 70 through the through hole 103 of the lock case 10 to abut the abutting portion 3021 of the latch pin 302 and uses the front end of the tool 70 to latch into the sunken area 3022 of the abutting portion 3021 to apply a force to push the latch pin 302, such that the latch pin compression spring 303 is compressed, and the latch 301 is extended completely out from the lock case panel 101, and then the tool 70 is used to drive the latch pin 302 together with the latch 301 for a synchronous rotation, such that the latch 301 can be rotated clockwise or counterclockwise to fit a lock of a door with a door panel opened from either side, so as to enhance the adaptability of the lock.

In the description above, the conventional lock assembly uses the cam of the core unit to push the transmission plate, so that the transmission plate pushes and extends the lock bolt out from the lock case panel to define a locked state of the lock.

Since the conventional lock has the issue of insufficiently extending the lock bolt out from the lock case panel, and thus a tool can be extended to unlock the lock easily.

Obviously, the anti-theft effect of the conventional lock is not good enough.

Although the conventional lock assembly is driven by the cam, yet the transmission plate of the conventional lock assembly simply displaces transversally with a horizontal vector, and the cam is rotated with respect to the core unit (as the axial center), and thus the cam can have an arc movement having both horizontal and vertical vectors. During the rotation process of the cam, the angle of pushing the transmission plate to displace is equal to an included angle a (which is an included angle of the cam moving from a position as shown in FIG. 6 to another position as shown in FIG. 7) as shown in FIG. 7. Once if the rotation angle of the cam exceeds the included angle, then the cam will be separated from the turning slot of the transmission plate to disable the pushing function, and the transmission plate and the

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lock bolt will remain still. Therefore, the lock bolt cannot be extended out from the lock case panel, and the actual measurement taken by the inventor of the present invention shows that the extended length of the lock bolt is approximately equal to 17 mm.

In view of the shortcomings of the prior art, the inventor of the present invention based on years of experience in the related industry to conduct extensive researches and experiments, and finally developed a lock assembly to overcome the insufficient extension of the lock bolt of a conventional lock.

SUMMARY OF THE INVENTION

Therefore, it is a primary objective of the present invention to overcome the shortcomings of the prior art by providing a lock assembly comprising a lock case and a lock bolt unit. The lock case contains a latch unit, a cover plate, a handle for controlling the latch unit independently, and a core unit for controlling the latch unit and the lock bolt unit separately. The latch is connected with the latch pin, fixed in the lock case, and rotated clockwise or counterclockwise by the latch pin to fit the lock with a door panel opened in either direction. The core unit rotates the lock bolt unit to extend/retract the lock bolt to/from a transmission plate and a transmission block, The transmission block has a protruding member embedded into an arc groove of the cover plate and pushes the transmission plate and the lock bolt to increase the length of extending the lock bolt out from the lock to enhance the anti-theft effect.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of a conventional lock; FIG. 2 is a perspective view of a conventional lock; FIG. 3 is a schematic view of movements of a latch operated by a handle a latch of a conventional lock; FIG. 4 is a schematic view of movements of a latch operated by a core unit of a conventional lock; FIG. 5 is a first schematic view of movements of a lock bolt operated by a core unit of a conventional lock; FIG. 6 is a second schematic view of movements of a lock bolt operated by a core unit of a conventional lock; FIG. 7 is a third schematic view of movements of a lock bolt operated by a core unit of a conventional lock; FIG. 8 is a schematic view of changing the direction of a latch of a conventional lock; FIG. 9 is an exploded view of the present invention; FIG. 10 is a perspective view of the present invention; FIG. 11 is a schematic view of movements of a latch operated by a handle in accordance with the present invention; FIG. 12 is a schematic view of movements of a latch operated by a core unit in accordance with the present invention; FIG. 13 is a first schematic view of movements of a lock bolt operated by a core unit in accordance with the present invention; FIG. 14 is a second schematic view of movements of a lock bolt operated by a core unit in accordance with the present invention; FIG. 15 is a third schematic view of movements of a lock bolt operated by a core unit in accordance with the present invention; and FIG. 16 is a schematic view of changing the direction of a latch in accordance with the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

To make it easier for our examiner to understand the technical characteristics of the present invention, preferred embodiments with accompanying drawings are used for the detailed description of the invention as follows: With reference to FIGS. 9 and 10 for a lock assembly of the present invention, the lock assembly comprises a lock case 1 and a cover plate 2, and the lock case I is fixed onto a lock case panel 11 and contains a latch unit 3 and a lock bolt unit 4, and the cover plate 2 has an L-shape guide slot 21, a transverse guide slot 22 and an arc guide slot 23, and an external surface of the cover plate 2 has a cover plate protecting sheet 24 and the cover plate protecting sheet 24 has an arc guide slot 241 corresponding to the arc guide slot 23 of the cover plate 2.

The latch unit 3 comprises a latch 31 and a latch pin 32. The latch pin 32 includes an abutting portion 321 and a rod 322, and a sunken area 3211 is formed on an external surface of the abutting portion 321. After the rod 322 is passed through a latch pin compression spring 33, a latch bracket 34 and a latch compression spring 35, the rod 322 is coupled with the latch 31 and fixed into a latch pin guider 12 of the lock case 1. The latch pin compression spring 33 is situated between the latch bracket 34 and the abutting portion 321 of the latch pin 32. The latch compression spring 35 is situated between the latch bracket 34 proximate to the internal wall of a side of the latch 31 and the latch pin guider 12, such that the extended pushing force of the latch compression spring 35 protrudes the latch 31 out from the lock case panel 11. In addition, a through hole 13 is disposed on a sidewall of the lock case I and at a position corresponding to the abutting portion 321 of the latch unit 3. The latch unit 3 further comprises an auxiliary hole block 36 provided for installing and connecting internal and external handles (not shown in the figure). A flange 361 is protruded from an external edge of the auxiliary hole block 36 and a recession 362 is concavely disposed on the auxiliary hole block 36 for inserting a push pin 37. A push pin compression spring 38 is sheathed onto the push pin 37 and another end of the push pin compression spring 38 is abutted against a push pin guider 14. Another end of the push pin 37 is passed out from the push pin guider 14. Further, an auxiliary moving plate 39 is sheathed axially with the auxiliary hole block 36, and a groove 391 is concavely disposed on a wall of the through hole of the auxiliary moving plate 39. The flange 361 of the auxiliary hole block 36 is disposed in the groove 391 and a protruding handle 392 is protruded from the top of the auxiliary moving plate 39.

The protruding handle 392 is situated between the latch pin guider 12 and another internal wall of the latch bracket 34, and a protruding ear 393 is protruded from the bottom of the auxiliary moving plate 39.

The lock bolt unit 4 comprises a lock bolt 41, a transmission plate 42 fixed to an end of the lock bolt 41, first and second bolt notches 421, 422 concavely disposed at the top of the transmission plate 42, and a protruding member 423. A transmission pin 424 and a positioning pin 425 are disposed at a surface of the front of the transmission plate 42, and the positioning pin 425 is inserted into the transverse guide slot 22 of the cover plate 2. A stop plate 43 is installed at the rear of the transmission plate 42 and has a plurality of longitudinal position limit slots 43] disposed on the stop plate 43 for inserting a positioning pin 151. A short fixing pillar 152 and a stop pillar 153 are in the lock case I respectively, such that the stop plate 43 can be displaced up and down in the lock case 1. Further, a protruding plate 432 is protruded from the top of the stop plate 43 and sheathed to a conical compression spring 433. The top of the conical compression spring 433 is abutted against a conical spring stopper 16. The top of the protruding plate 432 is extended out from the conical spring stopper 16. A bolt member 434 is disposed at the top of the plate and latched into the first bolt notch 421. An auxiliary pushing member 44 is disposed at the front of the transmission plate 42 and has a guide slot 441 on a surface facing the transmission plate 42. The protruding member 423 on the surface of the transmission plate 42 is embedded into the guide slot 441, and the auxiliary pushing member 44 includes a position protruding dot 442 disposed on a surface facing the cover plate 2. The position protruding dot 442 is inserted into the L-shape guide slot 21 of the cover plate 2. A groove 451 is concavely disposed at the top of the transmission block 45, and the transmission pin 424 of the transmission plate 42 is

I

situated in the groove 451. A pair of protruding arms 452, 453 are extended from the bottom of the transmission block 45. An arc protruding member 454 is protruded from transmission block 45 and faces a side of the cover plate 2, and inserted into the arc guide slot 23 of the cover plate 2. The lock further comprises a core unit 5 disposed at an appropriate position below the lock bolt unit 4 and having a cam 51.

Similarly, the operation of the present invention is divided into two modes" "Handle Operation" and "Lock Core Operation" as described below: 1. Handle Operation: In FIG. 11, if the handle 6 is operated to turn downward, the handle 6 will drive the auxiliary hole block 36 and the auxiliary moving plate 39 to rotate synchronously. Now, the auxiliary hole block 36 will push the push pin 37 such that an end of the push pin 37 is extended further out from the push pin guider 14, and the push pin compression spring 38 is compressed. In addition, the protruding handle 392 of the auxiliary moving plate 39 will push the latch bracket 34 to displace in a direction towards the abutting portion 321 of the latch pin 32, so that the latch compression spring 36 is compressed. Therefore, the latch pin 32 will drive the latch 31 to displace in a direction towards the abutting portion 321 synchronously, and the latch 31 will be retracted into the lock case I to define an unlocked state of the lock. On the other hand, if the handle 6 is released, the push pin compression spring 38 will resume its extension to push the auxiliary hole block 36 to turn, and the latch compression spring 35 will resume its extension at the same time to push the latch bracket 34 together with the latch pin 32 and the latch 31 to displace synchronously, such that the latch 31 is extended out from the lock case panel 11 to resume the locked state of the lock as shown in FIG. 10.

2. Operation of Lock Core: This operation is divided into two modes: "Lock Core Operating Latch" and "Lock Core Operating Lock bolt".

2.1. Lock Core Operating Latch: In FIG. 12, if the cam 51 for operating the core unit 5 is rotated in a direction towards the lock bolt 41, the cam 51 will push the auxiliary pushing member 44 to displace upward, such that the auxiliary pushing member 44 will prop and push the protruding ear 393 of the auxiliary moving plate -10..

39 to rotate the auxiliary moving plate 39, so that the protruding handle 392 props and pushes the latch bracket 34 to displace towards the abutting portion 321 of the latch pin 32. Now, only the latch compression spring 35 is compressed, and thus the latch pin 32 will drive the latch 31 to displace in a direction towards the abutting portion 321 synchronously to retract the latch 31 into the lock case 1 to define an unlocked state of the lock. On the other hand, if the external force for rotating the cam 51 is released, the latch compression spring 35 will resume its tension to prop and push the latch bracket 34 to displace with the latch pin 32 and the latch 31 synchronously, and the auxiliary moving plate 39 will be pushed and turned by the latch bracket 34, and the protruding ear 393 will push the auxiliary pushing member 44 to displace downward to extend the latch 31 out from the lock case panel 11 again to resume the locked state of the lock as shown in FIG. 10.

2.2. Lock Core Operating Lock bolt: In FIGS. 13 to 15, if the cam 51 for operating the core unit 5 is rotated in a direction away from the lock bolt 41, the cam 51 will push the stop plate 43 to displace upward to lift the bolt member 434 to be separated from the first bolt notch 421 of the transmission plate 42 and compresses the conical compression spring 433 to a compressed state, and then the cam 51 will be in contact with protruding arm 452 disposed at the bottom of the transmission block 45 and proximate to the lock bolt 41 (as shown in FIG. 13), and then the protruding arm 452 together with the transmission block 45 are pushed for a synchronous arc displacement along the arc guide slot 23 of the cover plate 2. Now, the transmission block 45 will push the transmission plate 42 since the transmission pin 424 of the transmission plate 42 is situated in the groove 451 of the transmission block 45, such that the transmission plate 42 together with the lock bolt 41 are displaced transversally and synchronously along the transverse guide slot 22 of the cover plate 2, and the lock bolt 41 is extended out from the lock case panel 11 (as shown in FIG. 14). In the aforementioned displacement process, the transmission block is displace along the path of the arc guide slot of the cover plate, and thus the displacement path of the transmission block 45 includes an arc displacement of both horizontal and vertical vectors. If the cam 51 of the core unit 5 is rotated, the I. transmission block 45 can be descended according to the cam 51, so that the cam 51 can push the protruding arm 452 continuously without the risk of being separated.

For the transmission plate 42 and the transmission block 45, the depth of the groove 451 of the transmission block 45 is greater than the descended height of the transmission block 45, such that even if the transmission block 45 descends along the arc guide slot 23, the transmission pin 424 of the transmission plate 42 will not be separated from the groove 451, and the transmission block 45 will continue to drive the transmission plate 42 and the lock bolt 41 to displace transversally until the arc protruding member 454 of the transmission block 45 reaches the end of the arc guide slot 23, and then the cam 51 will be separated from the protruding arm 452 of the transmission block 45. Now, the conical compression spring 433 will resume its extension to push the stop plate 43 to displace downward, so that the bolt member 434 of the stop plate 43 is descended and latched into the second bolt notch 422 of the transmission plate 42 to define a locked state of the lock as shown in FIG. 15.

On the other hand, if the cam 51 is turned in an opposite direction, the stop plate 43 will be pushed upward to prop another protruding arm 453 of the transmission block to drive the transmission plate 42 and the lock bolt 41 for a synchronous displacement, and the lock bolt 41 is retracted into the lock case 1 to resume the unlocked state of the lock as shown in FIG. 10.

In addition, the lock of the present invention has the function of changing the direction of the latch 31. With reference to FIG. 16, a user simply passes a tool 7 through the through hole 13 of the lock case I to abut the abutting portion 321 of the latch pin 32, and the front of the tool 7 is latched to a sunken area 3211 of the abutting portion 321 to apply a force to push the latch pin 32, such that the latch pin compression spring 33 is compressed to extend the latch 31 completely out from the lock case panel 11, and then the tool 7 drives the latch pin 32 to rotate synchronously with the latch 31, so that the latch 31 can be rotated clockwise or counterclockwise to fit a lock with a door panel opened in either direction to enhance the adaptability of the lock.

In view of the description above, the lock assembly of the present invention uses the transmission block as a connecting means between the cam of the core unit with the transmission plate and the lock bolt, and the transmission block adopts an arc displacement design having a horizontal vector and a vertical vector, and thus the invention can concurrently take care of the rotation of the cam and the horizontal displacement of the transmission plate to increase the effective driving angle of the cam. Related measurements show that the cam of the invention can really push the transmission plate to displace with an effective angle equal to an included angle 13 (which is the included angle of the cam moved from a position as shown in FIG. 14 to another position as shown in FIG. 15) as shown in FIG. 15, and the driving angle of the included angle 13 is obviously greater than the included angle a of the conventional lock. Therefore, the lock assembly of the present invention can increase the length of extending the lock bolt out from the lock case panel. In actual measurements, the inventor of the present invention discovers that the extended length of the lock bolt can reach approximately 21 mm, so that the lock assembly of the invention can increase the extended length, and the lock bolt can be extended deeply into the door stop to prevent the lock from being inserted, broken or opened by external forces or tools, so as to enhance the anti-theft effect significantly.

Claims

WHAT IS CLAIMED IS: I. A lock assembly, comprising a lock case and a cover plate, and said lock case being fixed onto a lock case panel and containing a latch unit and a lock bolt unit therein, and said lock including a handle and a core unit, characterized in that said cover plate of said lock comprises an L-shape guide slot, a transverse guide slot and an arc guide slot; and said lock bolt unit of said lock comprises a lock bolt, a transmission plate fixed to an end of said lock bolt, and first and second bolt notches concavely disposed at the top edge of said transmission plate, and a surface of the front of said transmission plate having a protruding member, a transmission pin and a positioning pin, and said positioning pin is inserted into said transverse guide slot of said cover plate; a stop plate is installed at the rear side of said transmission plate and displaced up and down in said lock case, and a protruding plate is protruded from the top edge of said stop plate and sheathed with a conical compression spring, arid the top of said conical compression spring abuts at a position limit plate, and the top of said protruding plate is passed through and out from said position limit plate, and a bolt member is disposed at the top of said stop plate and latched into said first bolt notch; an auxiliary pushing member is installed at the front side of said transmission plate and having a guide slot facing towards said transmission plate, and a protruding member on a surface of said transmission plate is embedded into a guide slot, and said auxiliary pushing member includes a position protruding dot facing towards a surface of said cover plate, and said position protruding dot is snapped into said L-shape guide slot of said cover plate; and a transmission block, having a groove concavely disposed at the top of said transmission block, and said transmission pin of said transmission plate is disposed in said groove, and a pair of protruding arms are extended from the bottom of said transmission plate, and said transmission block includes an arc protruding member protruded from a side facing said cover plate and inserted into said arc guide slot of said cover plate.
2. The lock assembly of claim 1, wherein said cover plate includes a cover plate protecting sheet fixed onto an external side of said cover plate, and said cover plate protecting sheet includes an arc guide slot corresponding to said arc guide slot of said cover plate.
3. The lock assembly of claim 1, wherein said latch unit comprises a latch and a latch pin, and said latch pin includes an abutting portion and a rod, and a sunken area is formed on an outer distal surface of said abutting portion, and after said rod is passed through said latch pin compression spring, said latch bracket and said latch compression spring, said rod is coupled to said latch and fixed into said latch pin guider of said lock case, and said latch pin compression spring is situated between said latch bracket and said abutting portion of said latch pin, and said latch compression spring is situated on an inner wall of said latch bracket and proximate to said latch and said latch pin guider, and said latch is protruded out from said lock case panel, and a through hole is disposed on a sidewall of said lock case and at a position corresponding to said abutting portion of said latch unit for passing a tool and abutting said abutting portion of said latch pin against said latch pin compression spring to extend said latch completely out from said lock case panel, so as to adjust a direction of said latch.