DOOR LOCKING DEVICE FOR UNLOCKING A LOCK AND
OPENING A DOOR SIMULTANEOUSLY
BACKGROUND OF THE INVENTION 1. Field of the Invention
This invention relates to a door-locking device and especially to a door locking device having a locking tongue for opening or closing a door, and a latch bolt controlling the closing, locking and unlocking functions of a door to enable unlocking and opening simultaneously in one operation 2. Description of Related Art
Generally, a conventional door-locking device including a locking tongue and a latch bolt has a main locking unit to control a movable latch bolt to lock or unlock a door When the latch bolt is in a locked status, it is limited by the main locking unit
In this case, turning a handle or a knob will not be able to withdraw the locking tongue into the door locking device and the door could not be opened. In other words, the door could not be opened by turning the handle or knob unless after the main locking unit is employed to disable the locked status of the latch bolt With a conventional door locking device, if we wish to open the door from inside a room when the latch bolt is at a locked position the locked status of the latch bolt must be disabled before the handle or knob is turned to withdraw the locking tongue into the door locking device, so the door can be opened, or, in other words, two steps are required to open the door Therefore, in case of a fire accident occurring inside a room, taking two steps will result in more complicated procedures and extended time, and this may result in failure to escape or seek shelter Therefore, there is an eager demand for a novel design which can improve these defects in the prior art
Furthermore, since the latch bolt and locking tongue entering into or withdrawing from the door locking device is controlled respectively by independent control devices (such as a handle, a push knob or a turning knob) In other words, the latch bolt can only be controlled by a control device to move reciprocally along a straight line and therefore, before opening a door, the user has to identify which device will function first Thus, operation is no so ideal Moreover, the requirement of two control device has disadvantageous effects on the design and appearance of a door locking device Therefore, how to integrate the two control devices of latch bolt and locking tongue in a door locking device has become the aim of manufacturers seeking improvement
SUMMARY OF THE INVENTION
It is therefore an object of this invention to provide a door locking device involving a single control device to control the locking performance by the latch bolt and the unlocking and opening performance by the latch bolt and the locking tongue, or in other words, by a single operation of the control device, the user can simultaneously unlock and open a door from inside a room, thereby simplifying its operating procedures and enabling faster escape in case of an emergency
In accordance with the foregoing and other objectives of this invention, a door locking device for unlocking a lock and opening a door simultaneously is provided The door locking device comprises a casing ; a lock cover for covering the casing, and such devices installed inside the casing as a lock head device mounted on the casing, a latch bolt unit for driving the lock head device, the latch bolt unit having a latch bolt capable of freely moving into and out of the casing, a driving unit being driven to rotate by the lock head device so to drive latch bolt to enter into or exit from the casing, a brake arm, and a connecting arm for connecting said driving unit with the brake arm ; and a locking tongue unit mounted in the casing to control the opening and closing of the door, causing one end of the brake arm to extend into locking tongue mechanism, so that when a control unit hinged to the locking tongue mechanism moves towards the first direction, the locking tongue in the locking tongue mechanism will retract to the casing and meanwhile by synchronously driving the brake arm to drive the latch bolt into the casing to complete the simultaneous door unlocking and opening operation, and when the control unit moves toward the second direction, the synchronously driven brake arm will push the latch bolt out of the casing to accomplish the locking operation
Therefore, in the present invention, to disable the locked status from outside the door, a key must be inserted to drive said lock head device, so that ssaid lock head device will drive said latch bolt unit to drive the latch bolt into the casing When the user wishes to open the door after it is unlocked, the user has to turn or press an outdoor control device that is fitted outside the door
To drive the locking tongue mechanism hinged to said outdoor control unit and withdraw the locking tongued into the casing before the door can be opened Since the outdoor control unit will drive the locking tongue unit only but not the brake arm, the outdoor control unit will only control the movement of the locking tongue mechanism, and could not control the latch bolt mechanism
Likewise, when the door locking device of the present invention to be operated inside the room, the control unit will drive said latch bolt unit to drive the latch bolt into a locked position, or drive said locking tongue mechanism to withdraw the locking tongue into the casing, and meanwhile drive said brake arm to further dive said latch bolt mechanism so that the latch bolt moves into a unlocked position
The door locking device of the present invention can be fitted with a security device, the device has a security tongue capable of freely accessing the casing, and because of the security tongue controlling the locking tongue, when the security tongue has withdrawn into said casing, an outdoor control unit operated form outside the door could not drive said locking tongue unit to withdraw said locking tongue into the casing But the control unit can drive said locking tongue unit to disengage the safety tongue from the locking tongue and withdraw the locking tongue into the casing
BRIEF DESCRIPTION OF DRAWINGS
The characteristics and performance of the invention can be fully understood by reading the following detailed description of the preferred embodiments, with reference made to the accompanying drawings It is to be understood that the drawings shall be for reference only, and shall not be based to confine the invention
FIG lA is an exploded view of the door-locking device as described in the preferred embodiment of the invention,
FIG IB is a perspective view of the casing of the door lock as described in the preferred embodiment of the invention,
FIG IC is a perspective view of the lock cover of the door lock as described in the preferred embodiment of the invention ;
FIG ID is an exploded view of the lock head device of the door lock as described in the preferred embodiment of the invention ;
FIG IE is an exploded perspective view of the embodiment of the lock and stud in the present invention
FIG IF is an exploded view of the locking tongue unit of the door lock as described in the preferred embodiment of the invention ;
FIG IG is an exploded view of the safety unit of the door lock as described in the preferred embodiment of the invention,
FIG 2 is a perspective view of the assembled door lock before the lock covers upon the casing, as described in the preferred embodiment of the invention ;
FIG 3 is a front view of the assembled door lock before the lock cover is covered onto the casing, as described in the preferred embodiment of the invention,
FIG 4 illustrates the lock head device of the door lock, when a key is inserted and turned counterclockwise through about 1700, as described in the preferred embodiment of the invention,
FIG 5 illustrates the lock head device of the door lock, when a key is inserted and turned counterclockwise through about 1900, so the latch bolt is in a locked position, as described in the preferred embodiment of the invention,
FIG 6 illustrates the lock head device of the door lock, when the key is inserted, turned counterclockwise, and returned to its original position, as described in the preferred embodiment of the invention,
FIG 7 illustrates how the handle of the door lock is turned to disable the locked status and open the door, as described in the preferred embodiment of the invention,
FIG 8 illustrates how the handle of the door lock is turned to lock the door-locking device, as described in the preferred embodiment of the invention,
FIG 9 illustrates how the locking tongue of the door lock could not return into the casing because the security tongue has retreated into the casing, as described in the preferred embodiment of the invention,
FIG 10 is a front view of the assembled door lock as it is viewed from outside the room, as described in the preferred embodiment of the invention, and
FIG 11 is a front view of the assembled door lock as it is viewed from inside the room, as described in the preferred embodiment of the invention
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
As shown in FIG 1, the door lock of the present invention comprises a casing 1, a lock cover 2 fitted to the casing 1, a lock head unit 3 in the casing 1, a latch bolt unit 4 serving for the lock head unit 3 a locking tongue unit 5 for controlling the opening and closing of a door, and a fuse unit 6
As shown in FIGs IA, IB and 2, the casing lis composed of a bottom plate 10, a faceplate II, a first side plate 12, a second side plate 13 and a third side plate 14 vertically joined to the four sides of the bottom plate 10 The bottom plate 10 is formed with an installing hole 100 through which the lock head 30 can be screwed, as well as fixing posts 101, 102,103, 104, 105 and 106, positioning holes 107a, 107b and 107c, limiting chutes 108a, 108b and 109A and 109b, and fixing bolts 1090, 1091 and 1092
The faceplate 11 are formed with a latch bolt opening 110, a locking tongue opening Ill, a catch tongue opening 112 and a positioning hole 113, as well as two or more fixing screw holes 114 The second side plate 13 facing the inside wall fo the faceplate I I are also installed with four fixing juts 130
As shown in FIGs. IA, IC and 2, the lock cover 2 can cover upon the casing 1, which has a installing hole 20 matching the istalling hole 100 on the casing 1, fixing holes 22a, 22b, 22c and 22d with respective to the locking screw bolts 1090,1091 and 1092 limiting chutes 25a, 25b and 25c with respective to the limiting chutes 108a, 108b and 109c on the casing 1, and through holes 26a, 26b, 26c and 26d
As shown in FIGs lA, 1 D and 2, the lock head unit 3 has a lock head 30 screwed into the installing hole 100 on the casing 1 One end of the lock head 30 is formed with a keyhole (not shown in drawing) to accommodate the insertion of a key, while other end thereof is axially connected with a driving piece 301 When a lock piece or a squeeze piece (not shown in drawing) is driven by a key inside the lock head 30, the driving piece 301 will rotate synchronously with the lock piece or squeeze piece Since a
conventional one can be used as the lock head 30, there is no is no special limitation, so the details will not be further described herein The lock head unit 3 also includes a connecting arm 34 hinged to a fixing post on the casing 1, and the upper end of said connecting arm 34 is formed with a through hole 340 At a position about one fourth of the full length distance from said through hole 340 has shaft hole 341 The lower end thereof has a stop flange 342, in which, the shaft hole 341 serves to be inserted by the fixing post 103 on the casing 1, so that the connecting arm 34 can rotate freely around the axis of the fixing post 103 The stop flange 342 resists against a locking screw bolt 1090 on the casing 1 A control plate 35 is a stop part 350, while the lower end is a push part 351 A control block 36 is disposed on the connecting arm 34 The side of the control block 36 is installed with a through hole 30 The control block 36 is hinged onto the connecting arm 34 with an assembling bolt 37 passing through the through hole 360 of the control block 36 and the through hole 340 of the connecting arm 34, and the lower part of the control block 36 is connected to first stop parts 361 and 362 (refer to FIG 5), the right end thereof is a third stop part 363 After the control plate 35 and the second stop part of the connecting arm 34 are hinged onto the fixing post 12c on the casing 1, and when the control block 36 is fitted by the assembling bolt 37 to the through hole 340 of the connecting arm 34, the stop part 350 at the upper part of the control plate 35 is justly restricted between the first and second stop parts 361 and 362 of the control block 36 A positioning rod 32 fixed between the limiting rods 37a and 37b (shown in FIG lB) of the casing is installed, and at one end of the positioning rod 32 is a annular recess 320 buckled between the limiting rods 37a and 37b, and the top of the end is formed with an adjusting groove 321 that can be inserted by a screwdriver to turn the positioning rod 32, and around the other end of the positining rod 32 is formed with a screw thread 322 A positioning fork 33 for fixing the lock head 30 is screwed into one end of the positioning rod 32 with a screw thread 322, so that the positioning fork 33 has a rectangular foundation board 330 The center of said foundation board 330 is a screw hole 331 capable of screwing with the thread 322 at the end of the positioning rod 32 Two ends of the foundation board 330 are elongated tips 332 and 333 The tips 332 and 333 can be closed with the groove 302 on the lock head 30 to fasten said lock head 30 onto the casing 1 and the lock cover 2
As shown in FIGs 1A and 2, said latch bolt unit 4 comprises, a latch bolt 40 freely accessing the a latch bolt opening 110 on the casing 1, a driving unit 41 connected with the latch bolt 40, a brake arm 45 and a connecting arm 44 for connecting the brake arm 45 with the driving unit 41 The latch bolt 40 is shaped as a square metal block, and is connected to t metal connecting plate 401 with an approximate rectangle shape The connecting plate 401 is formed with an elongated oblique chute 402 and a stop flange (not shown in drawing) disposing on the back of said connecting plate 401 The right end of the connecting plate 401 is connected with a stop part 403, and the back of the stop part 403 has a jut 404 that works with a limiting chute 1080 on the casing 1 to limit the latch bolt 40 in straight-line movement. The driving unit 41 on the fixing hole 107c of the casing I has a head 410 and an acting arm 411 The head 410 has post protrusions 4101 that are respectively located at front and rear sides thereof, push parts 4102,4103 and 4104 extending outwards, and a ring 4105 linked to the lower part of the head 410 The distal end of the connecting arm 411 is formed with a through hole 4111
The post protrusion 4101 of the head 410 of the driving unit 41 is installed with a square shaped vent hole 4106, therein so that the driving unit 41 can be hinged onto the fixing hole 107c on the casing I by means of said square shaped vent hole 4106 The
through hole 4111 at the end of the acting arm 411 of the driving unit 41 serves to be penetrated by a positioning bolt 46a By the positioning bolt 46a, the acting arm 411 is connected with the connecting plate 401 Moreover, positioning bolt 46a can slide freely inside the chute 402 along the extended direction of the chute 402, and meanwhile, the driving unit 41 is linked to an indicative construction 42, the indicative construction 42 has a fixing plate 420 The fixing plate 420 has a pair of fixing screw holes 420 thereof and 422 for fixing the indicative construction 42 on the casing 2 An indicative plate 423 serves to indicate whether the latch bolt 40 is in a locked or unlocked status On the back of the indicative plate 423 is hinged with a square post 424 that enables the indicative plate 423 to rotate freely on the fixing plate 420 The square post 424 is inserted through the through hole 26a on the lock cover 2 and hinged into the square vent hole 4106 of the driving unit 41, so that the indicative plate 423 rotates around the square post 424 along with the turning of the driving unit 41 in order to judge the location of the latch bolt 40 The latch bolt unit 4 also includes an L-shaped connecting rod 43 that is hinged onto the fixing post 102 on said casing 1
A shorter side of said L-shaped connecting rod 43 has a through hole 430 for being inserted by the fixing post 102 to position the
L-shaped connecting rod 43 onto the casing I The brake arm 45 includes a post body 450, two stop flanges 4501 and 4502 which are linked to the circumference of the post body 450 and is formed as a push part 4503 between said two stop flanges 4501 and 4502, An extended plate 452 is connected to one end of said post body 450, and the post body 450 is formed with a through hole 453 to be inserted by the fixing post 102, and a through hole 454 at the distal end of said extended plate 452
The brake part 45 is connected to the driving unit 41 by means of a connecting arm 44 with through holes 440 and 441 at the right and left ends A positioning bolt 46b passes sequentially through the through hole 441 at the right end of said connecting arm 44 and the round ring 4105 of the driving unit 41 A positioning bolt 46c passes sequentially through the through hole 454 of said brake arm 45 and the through hole 440 at the left end of the connecting arm 44, thereby the latch bolt 40, the driving unit 41, the connecting arm 44 and the brake arm 45 of the latch bolt unit 4 form an interactive relation status The latch bolt unit 4 also includes a plate spring 47 on the locking screw bolt 1901 on the casing 1 One end of said plate spring 47 is curved and mounted on the locking screw post 1901, while the other end resists against the push part 4102 of the driving unit 41, so that the driving unit 41 actuated by the plate spring 47 A control block 48 is fastened by a positioning key 49 onto the positioning hole 107a on the casing 1 The lower part thereof has a through hole 481 for receiving the positioning key 49, and two ends thereof is formed with stop parts 482 and 483, so a groove 484 is formed between the stop parts 482 and 483 When said latch bolt 40 is withdrawn into the casing 1, the stop part 403 of the connecting plate 401 of the latch bolt 40 can be received within said depressed groove 484
As shown in FIGs lA, IF and 2, the locking tongue unit 5 comprises a first brake plate 52 and a second brake plate 53 both having an identical construction, a first driving plate 54a and a second driving plate 54b symmetrically positioned to clasp the first brake plate 52 and the second brake plate 53 there between, serving for driving the first brake plate 52 and second brake plate 53 to move straightly a linking rack 51 in connection with said first brake plate 52 and second brake plate 53, moving along with the first brake plate 52 or second brake plate 53, and a locking tongue 50 fixed to said linking rack 51 The first brake plate 52 has two parallel rectangular plates 521 and 522, and the rectangular plates 521 and 522 are installed with respectively chutes 5210 and 5220 The right ends of said rectangular plates
521 and 522 are connected with stop parts 5211 and 5221 Referring to FIG 3, on the sides of the stop parts 5211 and 5221 facing the second side plate 13 are protruded with posts 5211 a and 5221a for mounting spiral springs 58a and 58b thereon to restrict the spiral springs 58a and 58b between said stop parts 5211 and 5221 and the second side plate 13 The left end of said rectangular plate 521 is vertically formed with a first stop plate 5212, and a groove 5222 is formed thereon The left side of the groove 5222 has a protrusion 5223 The stop parts 5211 and 5221 are respectively mounted inside the limiting chutes 25a and 25b on the lock cover 2, to restrict the first brake plate 52 to move reciprocally along a straight path The left ends of the rectangular plates 521 and 522 is a connecting part 523 The connecting part 523 has a flange 5230 and a semi-round notch 5231 in the vertical direction of the rectangular plates 521 and 522 The second brake plate 53 also has two parallel rectangular plates 531 and 532 The rectangular plates 531 and 532 are formed with chutes 5310 and 5320 The right ends of said rectangular plates is formed with stop parts 5311 and 5321
Another, the sides of said stop parts 5311 and 5321 facing the second side plate 13 is also extended with protruded posts 5311a and 5321a, so that the spiral springs 58c and 58d can be mounted thereupon to limit the spiral springs 58c and 58d between the stop parts 5311 and 5321 and the second side plate 13 The left end of the rectangular plate 531 is vertically connected with a stop plate 5312, and the upper part thereof is a depressed groove 5322
The right side of said depressed groove 5322 is a protrusion 5323
The stop flanges 5311 and 5321 are respectively mounted inside the limiting chutes 108a and 108b of the casing 1 for limiting the second brake plate 53 moving straightly along straight Also linked to the left ends of the parallel rectangular plates 531 and 532 is a linking part 533, side linking part 533 has a flange 5330 and a semi-round notch 5331 in the vertical direction of said rectangular plates 531 and 532 As the second brake plate 53 being installed on the casing 1, the spiral springs 58c and 58d are respectively connected to the protruding posts 531 la and 5321a and the fixing jut 130 on the casing to push said second brake plate 53 elastically After it moves toward the second side plate 13 and when the outside force pushing on said second brake plate 53 is released, the resiliency of the spiral springs 58c and 58d will push the second brake plate 53 back to its original location
Likewise, the first brake plate 52 and the spiral springs 58a and 58b function in the same way, so they need no elaboration here
The first driving plate 54a is composed of a column main body 541a and a monobloc-formed thin plate 542a with an approximate semi-circular shape The center of the column main body 541a is formed with a square vent hole 541 la, while at the upper part of the thin plate 542a is formed with a stop part 653a and another stop part 5422a is formed at the lower part thereof Likewise, the second driving plate 54b is composed of a column main bogy 541b and a monobloc-formed thin plate 542b with an approximate semi-circular shape The center of the column main body 541b has a square vent hole 541 Ib, while the upper end of the thin plate 542b is formed with a stop part 5421b and another stop part 5422b is formed at a on lower part The linking rack 51 has a rectangular later 510, a round through hole 511 a formed at the center of said plate 51, and two hooks 512 and 513 linked vertically to two ends of the plate 51, so that the hooks 512 and 513 can reach into the chutes 5210 and 5310 and 5220 and 5320 of the first brake plate 52 and the second brake plate 53, and the linking rack 51 can be pushed and moved by either the first brake plate 52 or the second brake plate 53 The locking tongue 50 is connected to a round column 502 The round column 502 is extended from the round through hole 511 of said linking rack 51
Further, a spring 56 is mounted between the plate 510 and the positioning rack 503 (shown in FIG 3) on the casing 1, so that after the outer force applied on the locking tongue 50 for withdrawing it out of the casing is removed, the resiliency of the spring 56 will push the locking tongue 50 out of the casing 1 and resume its original position Alternatively, the square vent holes 541 la and 541 lob of the first driving plate 54a and the second driving plate 54b is hinged a rotating shaft 59 The rotating shaft 59 is shaped as a square column and has a first section 591 and a second section 592 that are interlinked The first section 591 and second section 592 can be rotated independently One side of the first section 591 near the second section 592 is a protruded post 5910, which is so designed that when the rotating shaft 59 is installed inside the square vent holes 541 la and 541 lob, the protruded post 5910 will be pushing onto the top side of the first driving plate 54a and thus, the first section 591 is exposed out of the first driving plate 54a
Another, since the first section 591 of the rotating shaft 59 can rotate independently from the second section 592, when the first section 591 of the rotating is rotated to drive the first driving plate 54a, the second section of the rotating shaft 59 will not be rotated to drive the second driving plate 54b Therefore, when the first section 591 of the rotating shaft 59 rotates clockwise and drive the first driving plate 54a to rotate clockwise, the stop part 542 la of the first driving plate 54a will drive the first brake plate 52, and then drive the linking rack 51 along the direction of the second side plate 13 so as to withdraw the locking tongue 50 into the casing 1
As shown in FIGs 1A, 1G and 2, said security unit 6 comprises a fixing rack 66 installed on the fixing post 101 of the casing I The fixing rack 66 is composed of two parallel plates 660 and 661 which has a shave like a bullet The tip ends on the right sides of the plates 660 and 661 are matching through holes 6601 and 6611, and the upper end of the plate 660 is formed with match 6602 and a first push part 6603 The left end of the plate 660 has groove 6604 and a second push part 6605 The approximate central part below the plates 660 and 661 is vertically fitted with a connecting plate 663 which serves to join said plates 660 and 661 The upper part of the left end of the plate 660 is vertically connected with a stop part 662 A spring 67 is installed between the through holes 6601 and 6611 on the plates 660 and 661 of the fixing rack 66 with the fixing post 101 running sequentially through the through hole 6601 of said fixing rack 66, the spring 67 and the through hole 6611 of the fising rack
Then, the left end of said spring 67 resists against the connecting plate 663 of the fixing rack 66, while its right end exactly resists against the locking screw bolt 1092 of the casing 1, so that the elasticity of said spring 67 can be acting upon said fixing rack 66
A fixing plate 65 is installed on the catch groove 19 of the casing 1 The fixing plate 65 is formed with a through hole 650 a top rack 61 is installed between the faceplate 11 of the casing 1 anc said fixing plate 65, and the top rack is composed of two parallel plates 610,611 and a connecting plate 612 that joins said parallel plates 610 and 611 The plates 610 and 611 are formed with through holes 6101 and 6111 which match the through hole 650 on
said fixing plate 65 The plate 611 is formed with a protruded al ixi 1 1 s
flange 6112 a security tongue can freely access a security tongue opening 112 on the face 11 A shaft 601 is linked to said safety tongue 60 in a way that the shaft runs sequentially through said through holes 6101,6111 and 650, so the safety tongue 60 can move reciprocally in a straight line by way of the shaft 601.
Besides, the shaft 601 is installed with a first spring 62 and a second spring 64. The first spring 62 is confined between said plates 610 and 611, while the second spring 64 is confined between the plate 611 and the fixing plate 65 Another, the shaft 601 is installed with a annular groove 602 for being inserted by a C-shaped ring 63, so that the security tongue 60 can be subjected to the elasticity of the first spring 62 and the second spring 64 After the outside force causing it to withdraw into the casing is removed, the elasticity of the first spring 62 and the second spring 64 will restore back to the original position.
As shown in FIG. 3, when all the components of the door lock unit according to the present invention is assembled in said casing 1, the top end 3010 of the driving plate 301 of the lock head 30 is aligned to 12-oclock direction, and the left end of the acting arm 411 of the driving unit 41 is stopped to the upper end of the chute 402 of the connecting plate 401 by the positioning bolt 46a passing through the through hole 4111 Then, the latch bolt 40 withdraws entirely in the casing 1, while the locking tongue 50 exposes out of the locking tongue opening 111 of the casing 1, and the safety tongue 50 60 exposes out of-the safety tongue opening 112 of the casing 1 Another, the indicative plate 423 indicates to the plumb direction (not shown in drawing)
As shown in FIG 4, when the user inserts a key (not shown) from outside a room and turn the key for through 170 degrees counterclockwise (as the direction indicted by the arrow in the drawing), the top end 3010 of the driving plate 301 of the lock head 30 enters into the groove formed by the push parts 4103 and 4104 of the driving arm 41, while the remaining parts are the same as in FIG. 3 As shown in FIG 5, when the door is closed while the key is turned through 190 degrees counterclockwise, the top end 3010 of the driving plate 301 of the lock head 30 will drive the push part 4104 of the driving unit 41 to turn to the left or counterclockwise to drive the acting arm 411, so that the acting arm 411 slides from the top of the chute 402 to the bottom of the chute 402 around the positioning bolt 46a in the through hole 4111 at its left Then, the latch bolt 40 is pushed out of said latch bolt opening 110 and into the latch bolt groove 71 on the wall 7 by the relative thrust resulting from the down sliding of said positioning bolt 46a, thus the door is in a locked status
Then, the stop flange (not shown in drawing) on the back of the connecting plate 401 of the latch bolt 40 moves to the left with the latch bolt 40 and pushes the control plate 35, so the control plate 35 rotates in clockwise direction to drive the stop part 350 of said control plate 35 to turn to the right (clockwise) and then push the second stop part 362 of said control block 36 so as to cause the control block 36 to move upwards, and the third stop part 363 to move out of the range of rotation of the driving plate 301 of the lock head 30. Then, the indicative plate 423 points to a 45-degree angle rising form the horizontal level because of its rotation with the driving unit 41, so the direction of said indicative plate 423 is seen from inside the room and whether said door is locked or not is known
As shown in FIGs 5 and 9, the safety tongue 60 is stopped by the wall 7 when the door is closed and withdraws inside the casing 1 (since there is no accommodating groove to accommodate the extension of the safety tongue 60), the flange 6112 of said plate 611 pushes the second push part 6605 of the plate 660 of the fixing rack 66, and continues to apply a right-side stress to the second push part 6605, so that the fixing rack 66 moves along the inner edge of the groove 6604 to cause the fixing rack 66 to move upwards Then the stop part 662 of the fixing rack 66 moves upwards and stop part the locking tongue opening 11, so that the locking tongue 50 could not reduce into the casing 1
As shown in FIG 6, when the key is further turned counterclockwise to drive the driving plate 301 of the lock head 30 (the direction indicated by the arrow in drawing), the driving late 301 turns with the key to its original position, and then all components of the door lock mechanism, other than the position of the driving plate 301 of the lock head 30, are the same as in
FIG 5 As shown in FIG 7, the dotted line part illustrate an imagination of the handle in the door lock unit of the present invention The handle H inside the door is turned clockwise (as indicated by the arrow in drawing) to drive the first section 591 of the shaft 59 to rotate so that the stop part 5421 a of the first driving plate 54a will drive the first brake plate 52 to move to the right, and drive the linking rack 51 to move to the right. Then, the protrusion 5223 of the first brake plate 52 resists against the push part 4503 of the brake arm 45 and then applies a rightward thrust to the push part 4503 to drive the brake arm 45 to rotate counterclockwise around the fixing post 102, and drives the connecting arm 44 to move leftwards This induce that the head 410 of the driving unit 41 rotates clockwise, and drives the acting arm 411 to slide upwards inside the chute 402 of the connecting plate 401 so that the latch bolt 40 moves inside the casing 1 until it withdraws entirely into the casing 1 to disable the locked status of the latch bolt 40. Then, being pushed against by the latch bolt 40 moving inwardly, the push part 351 of said control plate 35 rotates counterclockwise around the fixing post 103, and the stop part 350 of said control plate 35 pushes the first stop part 361 of said control block 36, to cause the third stop part 363 of the control block 36 to move down and then enter into the path of rotation of the driving plate 301 of the lock head 30, and therefore it stops the key from turning clockwise Another, along with the rightward movement of the first brake plate 52, the stop late 5212 of the first brake plate 52 will resists against the opening 6602 on the top side of the plate 660 of the fixing rack 66 Before it moves rightwards to push against the first push part 6603 of the fixing rack 66, then there will be a downward pressure on the first push part 6603 to push down said fixing rack 66, and then move rightwards along the edge at the top side of the plate 660 of the fixing rack 66 Then, the stop part 662 of the plate 660 will move down with the fixing rack 66 and out of the position where said locking tongue opening 111 is obstructed, causing the locking tongue 50 to withdraw into the casing 1 to open the door Then, the indicative plate 423 rotates with said driving unit 41 and resumes its indication to the plumb direction, as shown in Fig 11
Therefore, we can understand from Fig 7 that with the door lock mechanism of the present invention, a door can be unlocked and opened simultaneously by turning the handle inside the door
As shown in FIG 8, the dotted line illustrates an imagination of the handle in the subject invention of door lock mechanism
When the door is closed but not locked (in other words, the latch bolt 40 and the safety tongue 60 are withdrawn into the casing 1), turning the handle H inside the door clockwise will drive the first section 591 of the rotating shaft 59 to rotate so as to drives the first driving plate 54a to rotate counterclockwise (as indicated by the arrow in the drawing). Thus, the stop part 5421a of the first driving plate 54a will turn counterclockwise and push the stop flange 4501 of the brake arm 45 This forces the brake arm 45 to turn clockwise around the fixing post 102, and then drives the connecting rod 44 to move rightwards, and drives the head 410 of the driving unit 41 to turn counterclockwise Further, the acting arm 411 is driven to slide down into the chute 402 of the connecting plate 401 so as to push the latch bolt 40 to be out of the casing I until said latch bold 40 extends entirely out of said casing 1 Thus the latch bolt 40 has completed its locking function Then, the indicative plate 423 rotates with said driving unit 41 and points to a 45-degree angle rising from the horizontal level. Therefore we can know from inside the door whether the door is locked ?
Since the first section 591 and the second section 592 of the rotating shaft 59 can be rotated interactively, the handles inside and outside of the door will not move simultaneously Thus, rotation of the handle inside the door will not bring about rotation of the handle outside the door Likewise, turning the handle outside the door will not drive the handle inside the door to rotate
When the door is open, we can freely turn the handled downward, while the handle inside the door can only be turned downward, while the handle inside the door can be turned either up or down)
When the door is closed, we can turn down the handle inside the door to unlock and open the door simultaneously in one operation, while turning of the handle outside the door will not change the locked status or open the door
It is understood from the above description of the preferred embodiment of the invention that, when the door is in an opened status, we can turn up the handle inside the door to lock the door, but when we are outside the door, we have to insert a key and turn it counterclockwise in order to lock the door, when the door is in a locked status, we can turn the key clockwise from outside the door, reversing the procedure taken for locking purpose, to unlock the door from outside If we want to unlock and open the door, all we have to do is turn the handle clockwise from inside the door to unlock and open the door in one single operation