Three-locking and two-unlocking mechanism

Abstract

The invention relates to the technical field of locks, in particular to a three-lock two-unlocking mechanism which comprises a base and a transmission shaft, a movable bolt connecting plate, a transmission plate, a connecting rod assembly and three locking assemblies are arranged on the base, and two locking assemblies are connected with the transmission plate through gear and rack structures. The other locking assembly is connected with the transmission plate through a connecting rod assembly, a first rack is arranged on the bolt connecting plate, the transmission shaft is in transmission connection with the bolt connecting plate through meshing of a first gear and the first rack, the transmission plate is fixedly connected with a linkage plate, a protection plate is hinged to the bolt connecting plate, and a check block used for being matched with the protection plate in an abutting mode is arranged on the base. According to the three-lock two-unlocking mechanism, the protection plate is arranged to abut against the check block to prevent the bolt connecting plate from continuously moving, the connecting part and the spring bolt are prevented from being impacted, the situation that the three-lock two-unlocking mechanism is forcibly unlocked in the locking state is avoided, and potential safety hazards are eliminated.

Description

Technical Field

[0001] The present invention relates to the technical field of locks, and in particular to a three-lock and two-open mechanism. Background Art

[0002] Locks, especially multi-lock and multi-opening locks, have high anti-theft performance and are widely used in financial security products. For example, various safes or business databases in banks mostly use multi-lock and multi-opening locks. The safe or business database can only be opened after the multi-lock and multi-opening lock mechanism is unlocked.

[0003] The three-lock and two-open lock mechanism is more common among multi-lock and multi-open lock mechanisms. Patent CN2293629Y discloses a three-lock combination door lock device, which includes three locks. The three-lock and two-open lock mechanism can only be unlocked when any two locks are opened, and has a higher safety factor.

[0004] However, it was found that this solution still has the following problems: when the three-lock, two-open lock mechanism is in the locked state, the door bolt cannot usually be moved. If external force is continued to be applied to drive the transmission shaft to rotate, forcing the door bolt to move, it may cause a series of connecting parts to be damaged by the force, and the three locks involved will also be at risk of being damaged, thereby causing the lock mechanism to be forcibly opened, posing a safety hazard. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a three-lock, two-open mechanism. The present invention sets a protective plate to abut against a block to prevent the door bolt connecting plate from continuing to move, thereby preventing the connecting parts and the lock tongue from being impacted, and avoiding the three-lock, two-open mechanism from being forcibly opened when in a locked state, thereby eliminating safety hazards.

[0006] The technical solution adopted by the present invention is as follows: a three-lock and two-open mechanism, including a base and a transmission shaft, the base is provided with a movable door bolt connecting plate, a transmission plate, a connecting rod assembly and three groups of locking assemblies, two groups of locking assemblies are connected to the transmission plate through a gear rack structure, and the other group of locking assemblies is connected to the transmission plate through a connecting rod assembly, the door bolt connecting plate is provided with a first rack, the transmission shaft is engaged with the first rack through the first gear and forms a transmission connection with the door bolt connecting plate, the transmission plate is fixedly connected with a linkage plate, the door bolt connecting plate is hinged with a protective plate, the base is provided with a stop block for abutting and cooperating with the protective plate, the linkage plate is provided with an inclined hole inclined toward the stop block, and the protective plate is provided with a pin shaft passing through the inclined hole.

[0007] The linkage plate and the protection plate are respectively arranged on both sides of the door bolt connecting plate. A clearance hole is opened on the door bolt connecting plate. The pin shaft is also covered with a pin sleeve. The pin sleeve passes through the clearance hole and is plugged into the inclined hole. The pin sleeve extends to the outside of the inclined hole and is provided with a limit ring.

[0008] The protection plate is bent to form an abutting plate for the stopper to abut, and the base is provided with a clearance groove for the protection plate and the abutting plate to slide into.

[0009] The bolt connecting plate is also provided with an elastic member and a spring mounting box. The spring mounting box is arranged on the side of the abutment plate close to the stop block. One end of the elastic member extends into the spring mounting box to form abutment and the other end abuts against the abutment plate.

[0010] A limit pin is provided on the door bolt connecting plate at a side position corresponding to the protection plate away from the stop block, and the protection plate is in contact with the limit pin via an elastic member.

[0011] A strip hole is provided on both sides of the linkage plate corresponding to the inclined hole, and a connecting piece is provided on the door bolt connecting plate corresponding to the two strip holes. The two connecting pieces are respectively plugged into the corresponding strip holes.

[0012] Each group of the locking assemblies includes a lock and a lock tongue, each lock tongue is locked or unlocked by the corresponding lock, the three locks are a first lock, a second lock and a third lock, the three lock tongues are a first sliding locking plate, a second sliding locking plate and a third sliding locking plate, the second sliding locking plate and the third sliding locking plate are respectively provided with a second rack and a third rack, the transmission plate is provided with a second gear that is simultaneously meshed with the second rack and the third rack, the connecting rod assembly includes a first connecting rod, a second connecting rod and a third connecting rod, one end of the first connecting rod is connected to the first sliding locking plate and the other end is connected to the transmission plate, one end of the second connecting rod is connected to the base and the other end is connected to the transmission plate, one end of the third connecting rod is connected to the middle part of the first connecting rod and the other end is connected to the middle part of the second connecting rod.

[0013] A baffle is also provided between the first connecting rod and the transmission plate, and a first sliding groove for sliding connection of the first connecting rod and a second sliding groove for sliding connection of the transmission plate are provided on the baffle. Two limiting members are fixedly connected to the transmission plate, both of which are plugged into the second sliding groove, and there is a certain distance between the two limiting members.

[0014] A first blocking strip is bent at one end of the blocking plate, and the first blocking strip is used to abut against the second sliding locking plate or the third sliding locking plate.

[0015] The base is also fixedly connected to a limiting plate, one end of which is bent to form a second stop bar, and the second stop bar is used to abut against a side surface of the first stop bar away from the second sliding locking plate.

[0016] The beneficial effects of the present invention are as follows: the present invention prevents the door bolt connecting plate from continuing to move by setting a protective plate to abut the block, thereby preventing the connecting parts and the lock tongue from being impacted. The sliding matching structure of the pin shaft and the inclined hole can produce displacement buffering when the transmission shaft is abnormally stressed. A mechanical overload protection mechanism is formed by the abutment of the protective plate and the block, which not only maintains the normal unlocking function, but also effectively prevents illegal and violent opening, avoids the three-lock and two-open mechanism from being forcibly opened when in the locked state, and eliminates safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying any creative work, other drawings obtained based on these drawings still fall within the scope of the present invention.

[0018] Figure 1 This is a schematic structural diagram of the three-lock and two-open mechanism of the present invention;

[0019] Figure 2 A structural diagram of another perspective of the present invention;

[0020] Figure 3 This is a structural diagram of the present invention without the locking assembly and the connecting rod assembly;

[0021] Figure 4 for Figure 3 Schematic diagram of the structure without the pin sleeve and washer;

[0022] Figure 5 for Figure 4 A partial enlarged schematic diagram of point A in the middle;

[0023] Figure 6 It is a structural schematic diagram of another side of the present invention;

[0024] Figure 7 for Figure 6 A partial enlarged schematic diagram of point B in the middle;

[0025] Figure 8 This is a schematic structural diagram of the third viewing angle of the present invention;

[0026] Figure 9 for Figure 8 Schematic diagram of the structure without the limiting plate;

[0027] In the figure, 1-base, 2-transmission shaft, 3-door bolt connecting plate, 4-transmission plate, 5-first rack, 6-first gear, 7-linkage plate, 8-protection plate, 9-stopper, 10-oblique hole, 11-pin shaft, 12-allowing hole, 13-pin sleeve, 14-limiting ring, 15-abutting plate, 16-allowing groove, 17-elastic member, 18-spring mounting box, 19-limiting pin, 20-strip hole, 21-connecting member, 22-first lock, 23 -Second lock, 24-third lock, 25-first sliding locking plate, 26-second sliding locking plate, 27-third sliding locking plate, 28-second rack, 29-third rack, 30-second gear, 31-first connecting rod, 32-second connecting rod, 33-third connecting rod, 34-baffle, 35-first slide, 36-second slide, 37-limiting piece, 38-first stop bar, 39-limiting plate, 40-second stop bar, 41-washer. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0029] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. Subsequent embodiments will not explain this one by one.

[0030] The terms "upper," "lower," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side" used herein are merely references to the directions or positions in the accompanying drawings. These terms are intended to illustrate and facilitate understanding of the present invention and are not intended to limit the scope of protection of the present invention.

[0031] like Figures 1 to 9 The figure shows an embodiment of the present invention, a three-lock and two-open mechanism, including a base 1 and a transmission shaft 2, the base 1 is provided with a movable bolt connecting plate 3, a transmission plate 4, a connecting rod assembly and three groups of locking assemblies, wherein two groups of locking assemblies are connected to the transmission plate 4 through a gear rack structure, and the other group of locking assemblies is connected to the transmission plate 4 through a connecting rod assembly, the bolt connecting plate 3 is provided with a first rack 5, the transmission shaft 2 is engaged with the first rack 5 through a first gear 6 and forms a transmission connection with the bolt connecting plate 3, the transmission plate 4 is fixedly connected with a linkage plate 7, the bolt connecting plate 3 is hinged with a protective plate 8, the base 1 is provided with a stopper 9 for abutting and cooperating with the protective plate 8, the linkage plate 7 is provided with an inclined hole 10 inclined toward the stopper 9, and the protective plate 8 is provided with a pin shaft 11 passing through the inclined hole 10.

[0032] The beneficial effects of such a setting are as follows: the present invention prevents the door bolt connecting plate from continuing to move by arranging a protective plate to abut against a block, thereby preventing the connecting parts and the lock tongue from being impacted; the sliding matching structure of the pin shaft and the inclined hole can produce displacement buffering when the transmission shaft is abnormally stressed; a mechanical overload protection mechanism is formed by the abutment of the protective plate and the block, which not only maintains the normal unlocking function, but also effectively prevents illegal and violent opening, avoids the three-lock and two-open mechanism from being forcibly opened when in a locked state, and eliminates safety hazards.

[0033] The specific operation process is as follows: when two or more locking components are in the locked state, if the driving transmission shaft continues to drive the door bolt connecting plate to move, under the locking of the locking component, the transmission plate and the linkage plate are relatively fixed to the base, and the hinged protection plate on the door bolt connecting plate will cooperate with the inclined hole of the linkage plate through the pin shaft to form relative rotation, that is, the pin shaft slides along the inclined direction of the inclined hole, and the inclined hole is inclined toward the direction of the block. The inclined hole guides the pin shaft, and the door bolt connecting plate also moves a short distance following the rotation of the protection plate, until the protection plate rotates to against the block, and the door bolt connecting plate can no longer move.

[0034] It is further configured that the linkage plate 7 and the protection plate 8 are respectively arranged on both sides of the door bolt connecting plate 3, and a clearance hole 12 is opened on the door bolt connecting plate 3. The pin shaft 11 is also covered with a pin sleeve 13, and the pin sleeve 13 passes through the clearance hole 12 and is plugged into the inclined hole 10. The pin sleeve 13 extends to the outside of the inclined hole 10 and is provided with a limiting ring 14.

[0035] The beneficial effects of this arrangement are as follows: the overall structure is more streamlined and compact; the protection system including the protection plate is arranged on the back of the door bolt connecting plate; the transmission system is arranged on the front of the door bolt connecting plate to prevent interference; the pin shaft increases the contact area with the inner wall of the inclined hole through the pin sleeve; the pin sleeve can slide to the far end of the inclined hole faster, drive the protection plate to rotate faster, have a shorter stroke, faster response, and trigger the protection mechanism faster; the yield hole allows the pin shaft and the pin sleeve to slide freely, providing sliding space; the limit ring provides axial limitation for the pin sleeve, making the pin sleeve slide smoother.

[0036] It is further provided that the protection plate 8 is bent to form an abutting plate 15 for the stopper 9 to abut against, and the base 1 is provided with a clearance groove 16 for the protection plate 8 and the abutting plate 15 to slide into.

[0037] The beneficial effects of this setting are as follows: the abutment plate increases the force-bearing area with the block, provides a better abutment effect, and ensures the stability of the overload protection mechanism. When the three-lock and two-open mechanism is unlocked, the protection plate will not rotate, and the groove will allow the protection plate and the abutment plate to slide in, avoiding contact between the abutment plate and the block, and will not affect the normal unlocking function.

[0038] It is further provided that an elastic member 17 and a spring mounting box 18 are provided on the door bolt connecting plate 3. The spring mounting box 18 is arranged on the side of the abutment plate 15 close to the stop block 9. One end of the elastic member 17 extends into the spring mounting box 18 to form abutment and the other end abuts against the abutment plate 15.

[0039] The beneficial effects of this arrangement are as follows: the elastic part adopts the spring of the existing technology, the spring mounting box is used for spring installation, and the abutment plate is kept rotating to a position away from the block under the elastic force of the spring, and the abutment plate is prevented from abutting against the block when the three-lock and two-open mechanism is unlocked normally. Only when the overload protection mechanism is running, the pin shaft and the pin sleeve cooperate with the inclined hole to slide and drive the abutment plate to rotate to press down the spring.

[0040] It is further provided that a limiting pin 19 is provided on the bolt connecting plate 3 at a side position corresponding to the protection plate 8 away from the stop block 9 , and the protection plate 8 abuts against the limiting pin 19 through an elastic member 17 .

[0041] The beneficial effects of this arrangement are as follows: the limit pin serves to limit the protection plate, preventing the protection plate from rotating too far under the action of the spring, and the structure is more reasonable and stable.

[0042] It is further provided that a strip hole 20 is provided on both sides of the linkage plate 7 corresponding to the inclined hole 10, and a connecting piece 21 is provided on the bolt connecting plate 3 corresponding to the two strip holes 20, and the two connecting pieces 21 are respectively plugged into and matched with the corresponding strip holes 20.

[0043] The beneficial effects of such a setting are as follows: the door bolt connecting plate is not only connected to the linkage plate through the pin shaft of the protective plate, but is also equipped with two connecting parts connected to the strip holes of the linkage plate, increasing multiple transmission force points to ensure stable transmission, and the strip holes are unicyclic for the connecting parts to slide, providing the door bolt connecting plate with a certain moving distance. The door bolt connecting plate drives the two connecting parts to slide along the path of the corresponding strip holes until they abut against the inner wall of one end of the strip hole. The door bolt connecting plate drives the linkage plate to move. A washer 41 is also installed on each of the two connecting parts. The connecting parts ensure stable axial connection with the linkage plate through the washer 41 to prevent the connecting parts from detaching from the strip holes.

[0044] It is further configured that each group of the locking assemblies includes a lock and a lock tongue, each lock tongue is locked or unlocked by the corresponding lock, the three locks are a first lock 22, a second lock 23 and a third lock 24, the three lock tongues are a first sliding locking plate 25, a second sliding locking plate 26 and a third sliding locking plate 27, the second sliding locking plate 26 and the third sliding locking plate 27 are respectively provided with a second rack 28 and a third rack 29, the transmission plate 4 is provided with a second gear 30 that is simultaneously engaged with the second rack 28 and the third rack 29, the connecting rod assembly includes a first connecting rod 31, a second connecting rod 32 and a third connecting rod 33, one end of the first connecting rod 31 is connected to the first sliding locking plate 25 and the other end is connected to the transmission plate 4, one end of the second connecting rod 32 is connected to the base 1 and the other end is connected to the transmission plate 4, one end of the third connecting rod 33 is connected to the middle of the first connecting rod 31 and the other end is connected to the middle of the second connecting rod 32.

[0045] The beneficial effects of this arrangement are as follows: the three locks correspond to the three lock tongues of the three-lock structure, and the three locks are all arranged on the side of the corresponding lock tongue away from the transmission plate to lock or unlock the lock tongue. The second sliding locking plate and the third sliding locking plate are connected to the transmission plate through a gear rack connection structure, and the first sliding locking plate is connected to the transmission plate through a connecting rod assembly. The three lock tongues complement each other. Only when any two lock tongues are unlocked can the door bolt connecting plate move and the three-lock and two-open mechanism be opened, providing basic three-lock and two-open functions.

[0046] It is further configured that a baffle 34 is provided between the first connecting rod 31 and the transmission plate 4, and the baffle 34 is provided with a first sliding groove 35 for sliding connection of the first connecting rod 31 and a second sliding groove 36 for sliding connection of the transmission plate 4, and two limiting members 37 are fixedly connected to the transmission plate 4, both of which are plugged into the second sliding groove 36, and there is a certain distance between the two limiting members 37.

[0047] When the second and third sliding locking plates are both unlocked, the transmission plate and the baffle move synchronously, and the limit member does not slide in the second sliding groove. When only one of the second and third sliding locking plates is unlocked, the transmission plate moves through the gear rack structure and the lock tongue, while the baffle does not move, and the limit member on the transmission plate slides in the second sliding groove. When the two limit members with a spacing are respectively abutted against the two ends of the second sliding groove, it is the extreme position of the movement of the transmission plate. In general, this connection structure can allow the baffle and the transmission plate to move synchronously, and allow the transmission plate to move independently, depending on the unlocking state of the second and third sliding locking plates.

[0048] It is further provided that a first blocking bar 38 is bent at one end of the blocking plate 34 , and the first blocking bar 38 is used to abut against the second sliding locking plate 26 or the third sliding locking plate 27 .

[0049] The beneficial effects of this arrangement are as follows: when the second sliding locking plate and the third sliding locking plate are both unlocked, the first baffle can abut against the second sliding locking plate and the third sliding locking plate at the same time and move synchronously; when only one of the second sliding locking plate and the third sliding locking plate is unlocked, only the other locked lock tongue will abut against the first baffle, so that the first baffle also remains fixed, thereby ensuring the stability of the three-lock and two-open transmission.

[0050] Furthermore, a limit plate 39 is fixedly connected to the base 1 , and a second stop bar 40 is bent at one end of the limit plate 39 . The second stop bar 40 is used to abut against a side surface of the first stop bar 38 away from the second sliding locking plate 26 .

[0051] The beneficial effects of this setting are as follows: the second baffle of the limit plate is used to block the first baffle, and the other side of the first baffle abuts the second sliding locking plate and the third sliding locking plate, limiting the movement path of the baffle, ensuring that the baffle, the second sliding locking plate and the third sliding locking plate can all move horizontally smoothly and smoothly, preventing jamming when unlocking.

[0052] The above disclosure is merely a preferred embodiment of the present invention and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A three-lock, two-open mechanism, comprising a base (1) and a transmission shaft (2), wherein the base (1) is provided with a movable bolt connecting plate (3), a transmission plate (4), a connecting rod assembly, and three sets of locking assemblies, wherein two sets of locking assemblies are connected to the transmission plate (4) through a gear rack structure, and the other set of locking assemblies is connected to the transmission plate (4) through a connecting rod assembly, the bolt connecting plate (3) is provided with a first rack (5), and the transmission shaft (2) is meshed with the first rack (5) through a first gear (6) and forms a transmission connection with the bolt connecting plate (3), characterized in that: The transmission plate (4) is fixedly connected to a linkage plate (7), the bolt connection plate (3) is hinged to a protection plate (8), the base (1) is provided with a stopper (9) for abutting and cooperating with the protection plate (8), the linkage plate (7) is provided with an inclined hole (10) inclined toward the stopper (9), and the protection plate (8) is provided with a pin shaft (11) penetrating the inclined hole (10).

2. The three-lock, two-open mechanism according to claim 1, characterized in that: The linkage plate (7) and the protection plate (8) are respectively arranged on both sides of the door bolt connecting plate (3); a clearance hole (12) is opened on the door bolt connecting plate (3); the pin shaft (11) is also covered with a pin sleeve (13); the pin sleeve (13) passes through the clearance hole (12) and is plugged into the inclined hole (10); the pin sleeve (13) extends to the outside of the inclined hole (10) and is provided with a limiting ring (14).

3. The three-lock, two-open mechanism according to claim 2, characterized in that: The protection plate (8) is bent to form an abutment plate (15) for the stopper (9) to abut against, and the base (1) is provided with a clearance groove (16) for the protection plate (8) and the abutment plate (15) to slide into.

4. The three-lock, two-open mechanism according to claim 3, characterized in that: The bolt connecting plate (3) is further provided with an elastic member (17) and a spring mounting box (18). The spring mounting box (18) is arranged on the side of the abutting plate (15) close to the stopper (9). One end of the elastic member (17) extends into the spring mounting box (18) to form abutment, and the other end abuts against the abutting plate (15).

5. The three-lock, two-open mechanism according to claim 4, characterized in that: A limit pin (19) is provided on the bolt connecting plate (3) at a side position of the corresponding protection plate (8) away from the stop block (9), and the protection plate (8) abuts against the limit pin (19) via an elastic member (17).

6. The three-lock, two-open mechanism according to claim 1, characterized in that: A strip hole (20) is provided on both sides of the linkage plate (7) corresponding to the inclined hole (10), and a connecting piece (21) is provided on the bolt connecting plate (3) at positions corresponding to the two strip holes (20). The two connecting pieces (21) are respectively plugged into and matched with the corresponding strip holes (20).

7. The three-lock, two-open mechanism according to claim 1, characterized in that: Each group of the locking components comprises a lock and a lock tongue, each lock tongue is locked or unlocked by the corresponding lock, the three locks are a first lock (22), a second lock (23) and a third lock (24), the three lock tongues are a first sliding locking plate (25), a second sliding locking plate (26) and a third sliding locking plate (27), the second sliding locking plate (26) and the third sliding locking plate (27) are provided with a second rack (28) and a third rack (29) respectively, the transmission plate (4) is provided with a plurality of racks that are connected to the first rack (28) and the second rack (29) respectively. The second rack (28) and the third rack (29) are meshed with a second gear (30), and the connecting rod assembly includes a first connecting rod (31), a second connecting rod (32) and a third connecting rod (33), one end of the first connecting rod (31) is connected to the first sliding locking plate (25) and the other end is connected to the transmission plate (4), one end of the second connecting rod (32) is connected to the base (1) and the other end is connected to the transmission plate (4), and one end of the third connecting rod (33) is connected to the middle part of the first connecting rod (31) and the other end is connected to the middle part of the second connecting rod (32).

8. The three-lock, two-open mechanism according to claim 7, characterized in that: A baffle (34) is further provided between the first connecting rod (31) and the transmission plate (4), and the baffle (34) is provided with a first sliding groove (35) for sliding connection of the first connecting rod (31) and a second sliding groove (36) for sliding connection of the transmission plate (4), and two limiting members (37) are fixedly connected to the transmission plate (4) and are both plugged into the second sliding groove (36), and a certain distance is left between the two limiting members (37).

9. The three-lock, two-open mechanism according to claim 8, characterized in that: One end of the baffle (34) is bent to form a first baffle (38), and the first baffle (38) is used to abut against the second sliding locking plate (26) or the third sliding locking plate (27).

10. The three-lock, two-open mechanism according to claim 9, characterized in that: The base (1) is also fixedly connected to a limit plate (39), one end of which is bent to form a second stop bar (40), and the second stop bar (40) is used to abut against a side surface of the first stop bar (38) away from the second sliding locking plate (26).

Images