Latch bolt mechanism of lock body and lock body

Abstract

The utility model discloses a latch bolt mechanism of a lock body and the lock body, and the latch bolt mechanism comprises a latch bolt main body which is provided with a latch bolt part and a rod part which are connected with each other; the first elastic piece is matched with the latch bolt main body; the rotating sleeve can rotate around the axis of the rod part, when the latch bolt body slides, the rotating sleeve can be driven to synchronously and axially slide, the rotating sleeve is provided with a driving part, and the driving part is used for being matched with a locking element; the small tongue part and the mounting part are connected with each other, the mounting part is arranged on the latch bolt main body in a sliding manner, a guide groove and a guide block extending into the guide groove are arranged between the mounting part and the rotating sleeve, and when the guide groove and the guide block axially move on the rotating sleeve relative to the latch bolt accessory, the rotating sleeve can rotate relative to the latch bolt accessory, so that the position of the driving part is changed; and the second elastic piece is directly or indirectly matched with the latch bolt accessory and is used for enabling the latch bolt accessory to have a movement trend of moving towards the outer side of the lock shell. The structure is more compact.

Description

Technical Field

[0001] This utility model relates to the field of lock bodies, specifically to the latch mechanism of a lock body and the lock body itself. Background Technology

[0002] The most traditional mortise lock does not automatically extend the main bolt after the door is closed; the main bolt needs to be extended by lifting the handle.

[0003] To achieve automatic ejection of the main bolt, existing mechanical locks incorporate a structure that allows the main bolt mechanism to automatically eject under the action of an elastic element. When the door is open, the main bolt mechanism is locked by a locking element. After the door is closed, the latch mechanism unlocks the locking element, causing the main bolt mechanism to automatically eject under the action of the elastic element, thus locking the door. For example, patent document CN 105113856 A discloses a latch mechanism capable of automatically unlocking the main bolt mechanism when the door is closed.

[0004] However, the oblique tongue mechanism in the aforementioned patent documents is relatively complex, with the oblique tongue assembly and trigger tongue assembly arranged side by side at intervals, resulting in a large space occupation and an insufficiently compact lock body structure. Utility Model Content

[0005] This utility model addresses the above-mentioned problems and overcomes at least one deficiency by proposing a slanted tongue mechanism for the lock body and a lock body.

[0006] The technical solution adopted by this utility model is as follows:

[0007] A latch mechanism for a lock body, the lock body being used to cooperate with a strike plate mounted on a door frame, the lock body including a lock housing, a main latch mechanism, and a locking element movably mounted on the lock housing, the locking element being used to lock or unlock the main latch mechanism, the latch mechanism of the lock body including:

[0008] The latch body is slidably mounted on the lock housing, and the latch body has a latch portion and a rod portion that are connected to each other;

[0009] The first elastic element is disposed in the lock housing and is used to directly or indirectly cooperate with the main body of the latch, so that the main body of the latch has a tendency to move outward of the lock housing.

[0010] A rotating sleeve is rotatably mounted on the tongue and / or rod. The rotating sleeve can rotate about the axis of the rod. When the tongue body slides, it can drive the rotating sleeve to slide synchronously axially. The rotating sleeve has a driving part, which is used to cooperate with the locking element.

[0011] A latch attachment has a small tongue and a mounting part connected to each other. The mounting part is slidably disposed on the latch body. When the latch body slides into the lock housing, it can drive the latch attachment to move into the lock housing together. A guide structure is provided between the mounting part and the rotating sleeve. The guide structure includes a guide groove and a guide block extending into the guide groove. One of the guide groove and the guide block is disposed on the latch attachment, and the other is disposed on the rotating sleeve. The guide structure is used to enable the rotating sleeve to rotate relative to the latch attachment when the rotating sleeve moves axially relative to the latch attachment, thereby changing the position of the driving part; and

[0012] The second elastic element, which directly or indirectly cooperates with the latch attachment, is used to give the latch attachment a tendency to move outward of the lock case.

[0013] The latch mechanism has an open state, a closed but not fully closed state, and a fully closed state; the locking element has a locked state and an unlocked state.

[0014] When the latch mechanism is in the open state, the latch portion of the latch body extends out of the lock housing, the small tongue portion of the latch accessory extends out of the lock housing, the locking element is in the locked state, and the driving part is offset from the locking element;

[0015] When the latch mechanism is in the closed but not fully closed state, the latch part of the latch body is pressed and moves back into the lock housing, and the latch attachment also moves back into the lock housing under the action of the latch body.

[0016] When the latch mechanism is in the closed position, the small tongue of the latch accessory abuts against the buckle plate, and the latch body slides out of the lock case under the action of the first elastic element. When the latch body slides, it will drive the rotating sleeve to move synchronously. When the rotating sleeve moves relative to the mounting part, under the action of the mutually cooperating guide groove and guide block, the rotating sleeve rotates, changing the position of the driving part. During the movement of the driving part along the axial direction of the latch body after the position is changed, it will contact the locking element, so that the locking element switches from the locked state to the unlocked state.

[0017] The oblique tongue attachment of this application is slidably disposed on the oblique tongue body. Compared with the existing technology where the trigger tongue assembly and oblique tongue assembly are arranged side by side, the structure can be more compact. This application can realize the rotation of the rotating sleeve through the guide block, so that after the door is closed, the drive part can contact the locking element, so that the locking element switches from the locked state to the unlocked state.

[0018] In practical applications, the locking element can be rotatably mounted inside the lock housing or slidably mounted inside the lock housing. In practical applications, it also includes a reset elastic element for resetting the locking element.

[0019] In one embodiment of the present invention, the mounting part is slidably mounted on the rod part, and when the tongue mechanism is in the open state, the mounting part abuts against the tongue part;

[0020] The locking element has a clearance opening on one side, and when the latch mechanism is in the open state, the driving part passes through the clearance opening.

[0021] There are several ways to slide the mounting section, such as by inserting it into a slot or by using a track.

[0022] The clearance mentioned in this application may be on the locking element or in the external space on one side of the locking element.

[0023] In one embodiment of the present invention, the oblique tongue has a pressure-retracting surface and a thrust surface, the pressure-retracting surface is an inclined surface or an arc-shaped surface, the thrust surface has a groove, and the small tongue slides in conjunction with the groove.

[0024] The small tongue has a portion that protrudes from the slide groove. When the oblique tongue mechanism is in the closed position, the end face of the portion of the small tongue that protrudes from the slide groove contacts and engages with the buckle plate.

[0025] The small tongue has a protruding block with a protruding groove at one end away from the mounting part. The lock housing has a clearance groove for the protruding block to be inserted. When the latch mechanism is in the closed position, the protruding block abuts against the buckle plate, and at least part of the protruding block is inserted into the clearance groove.

[0026] The small tongue has a portion that protrudes from the slide groove. This design allows the latch plate to remain unchanged (there are many styles of latch plates, and not changing the latch plate can effectively reduce the installation efficiency and cost of the lock body). When the latch mechanism is in the open state, the main body of the latch extends into the limiting hole of the latch plate, and because the small tongue has a portion that protrudes from the slide groove, this protruding portion can continue to contact the latch plate, so that the latch attachment is in the retracted state.

[0027] This design of the tongue does not increase the thickness of the lock body compared to other structural forms, and it also eliminates the need for a special design for the strike plate.

[0028] In one embodiment of the present invention, the protrusion has an inclined or arc-shaped first guide surface on the side near the mounting part, and the thickness of the protrusion is smaller the further away from the slide groove; the clearance groove has a second guide surface adapted to the guide surface.

[0029] The cooperation between the first and second guide surfaces does not affect the insertion of the protruding block into the clearance groove when the latch mechanism is in the closed position. However, it reduces the amount of material that needs to be removed from the lock housing due to the clearance groove, thus ensuring the structural strength of the lock body. In other words, without the first and second guide surfaces, the protruding block would be a block of fixed thickness, requiring a larger clearance groove, which would remove more material and affect structural strength.

[0030] In one embodiment of the present invention, the oblique tongue has a pressure-retracting surface and a thrust surface, the pressure-retracting surface is an inclined surface or an arc-shaped surface, the thrust surface has a groove, and the small tongue slides in conjunction with the groove;

[0031] The buckle plate has a limiting hole for the latch body to be inserted into, and the buckle plate also has a protrusion that extends into the limiting hole; the small tongue is fully embedded in the sliding groove, and when the latch mechanism is in the closed position, the latch body extends into the limiting hole and the small tongue contacts and engages with the protrusion.

[0032] The small tongue is fully embedded in the slide groove, meaning that there is no part of the small tongue protruding from the slide groove. This setting does not change the thickness of the lock body, that is, the thickness of the lock body will not need to be increased due to the small tongue protruding from the slide groove.

[0033] In one embodiment of the present invention, the guide groove includes at least a guide portion that is not parallel to the axis of the rod, and the guide block moves at least a certain distance in the guide portion during the period from the closed-not-closed state to the closed-in state of the tongue mechanism.

[0034] In one embodiment of the present invention, the guide groove further includes a first part and a second part, wherein the first part, the guide part, and the second part are connected in sequence;

[0035] When the latch mechanism is in the open state and the closed state, the guide block is located at the first part or at the junction of the first part and the guide part.

[0036] When the oblique tongue mechanism is in the closed position, the guide block is located at the second part or at the junction of the second part and the guide part.

[0037] In one embodiment of the present invention, the guide groove is disposed on the rotating sleeve, and the guide block is disposed on the mounting part;

[0038] The rotating sleeve also has a notch;

[0039] The mounting part is installed on the outside of the rod, the rotating sleeve is fitted on the outside of the mounting part, and the small tongue protrudes through the notch;

[0040] The second elastic element is a spring, which is sleeved on the rod. One end of the second elastic element is engaged with the mounting part, and the other end is engaged with the rotating sleeve or the rod.

[0041] In one embodiment of the present invention, the outer wall of the rod has a limiting part, and the rotating sleeve is fitted over the rod and located between the oblique tongue and the limiting part;

[0042] The first elastic element is a spring, tension spring, or torsion spring. One end of the first elastic element is engaged with the lock housing, and the other end is engaged directly or indirectly with the rod.

[0043] In practical applications, the limiting part can be an integral structure with the rod, or it can be a retaining ring installed on the rod.

[0044] This application also discloses a lock body for cooperating with a strike plate installed on a door frame. The lock body includes a lock shell, a latch mechanism, a main latch mechanism, and a locking element movably installed on the lock shell. The locking element is used to lock or unlock the main latch mechanism. The latch mechanism is the latch mechanism of the lock body described above.

[0045] The beneficial effects of this utility model are: the oblique tongue attachment of this application is slidably disposed on the oblique tongue body, which makes the structure more compact compared with the existing technology structure in which the trigger tongue assembly and the oblique tongue assembly are arranged side by side. This application can realize the rotation of the rotating sleeve through the guide block, so that after the door is closed, the drive part can contact the locking element, so that the locking element switches from the locked state to the unlocked state. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the latch plate, lock housing, and latch mechanism;

[0047] Figure 2 This is the front view of the slant latch mechanism;

[0048] Figure 3 yes Figure 2 Sectional view of AA;

[0049] Figure 4 This is a schematic diagram of the main body of the slanted tongue, the slanted tongue accessory box, and the rotating sleeve;

[0050] Figure 5 This is a schematic diagram of the locking element, the reset elastic element, and the latch mechanism;

[0051] Figure 6 This is an exploded view of the locking element, the reset elastic element, and the latch mechanism;

[0052] Figure 7 This is a schematic diagram of the latch plate and lock housing when the latch mechanism is in the closed position;

[0053] Figure 8 This is a schematic diagram of the latch plate and lock body when the latch mechanism is in the closed but not fully closed state;

[0054] Figure 9 This is a schematic diagram of the latch plate and lock body at another angle when the latch mechanism is in the closed but not fully closed state;

[0055] Figure 10 This is a schematic diagram of the rotating sleeve moving outward and just making contact with the locking element;

[0056] Figure 11 This is a schematic diagram of another angle when the rotating sleeve moves outward and just contacts the locking element;

[0057] Figure 12 This is a schematic diagram of another angle when the rotating sleeve moves outward and just contacts the locking element;

[0058] Figure 13 This is a schematic diagram of the latch plate, lock housing, and latch mechanism when the latch mechanism is in the closed position;

[0059] Figure 14 This is a schematic diagram of the latch plate, lock housing, and latch mechanism from another angle when the latch mechanism is in the closed position.

[0060] Figure 15 This is a schematic diagram of the lock body when the locking element has just switched to the unlocked state;

[0061] Figure 16 It is the rack that is pulled by Figure 15 A diagram showing the position after the locked position has been moved to the released position;

[0062] Figure 17 This is a schematic diagram of the main locking bolt mechanism;

[0063] Figure 18 This is an exploded view of the main locking bolt mechanism;

[0064] Figure 19 This is a diagram illustrating how the key moves the lock cylinder's latch to the unlocked position.

[0065] Figure 20 This is a schematic diagram of the lock cylinder;

[0066] Figure 21 This is a schematic diagram of the lock body in Embodiment 2;

[0067] Figure 22 This is a schematic diagram of the lock body and strike plate in Example 2.

[0068] Figure 23 This is an exploded view of the tongue body, tongue attachment, rotating sleeve, and second elastic element in Embodiment 2.

[0069] The labels for the attached figures are as follows:

[0070] 1. Buckle plate; 11. Limiting hole; 12. Protrusion; 2. Lock housing; 21. Clearance groove; 211. Second guide surface; 3. Lug mechanism; 31. Lug body; 311. Lug part; 3111. Pressure-retracting surface; 3112. Thrust surface; 31121. Slide groove; 312. Rod part; 3121. Limiting part; 32. First elastic element; 33. Rotating sleeve; 331. Drive part; 332. Notch; 333. Guide groove; 3331. Guide part; 3332. First part; 3333. Second part; 34. Lug accessory; 341. Small tongue part; 3411. Protrusion; 34111. First guide surface; 342. Mounting part; 3421. Guide block; 35. Second elastic element; 4. Main latch mechanism; 4 1. Main bolt body; 411. Main bolt portion; 412. Main bolt plate; 4121. Drive groove; 42. Main bolt actuating block; 421. Drive block; 43. First rotation axis; 44. Pull rack; 441. Locking part; 45. Main bolt ejection elastic element; 46. Transmission component; 461. Tooth; 47. Rotating lever; 471. First mating part; 472. Third mating part; 48. Lock cylinder; 481. Lock head cam; 49. Lock head lever; 491. Pressurized part; 492. Second mating part; 493. Fourth mating part; 494. Unlocking part; 5. Locking element; 51. Clearance opening; 6. Reset elastic element; 71. Handle shaft; 72. Handle lever; 721. Fifth mating part; 722. Sixth mating part. Detailed Implementation

[0071] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0072] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0073] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0074] The present invention will now be described in detail with reference to the accompanying drawings.

[0075] Example 1

[0076] like Figures 1-20 As shown, this embodiment discloses a lock body for cooperating with a strike plate 1 installed on a door frame.

[0077] like Figure 8 As shown, the lock body includes a lock housing 2, a latch mechanism 3, a main latch mechanism 4, and a locking element 5 movably mounted on the lock housing 2. The locking element 5 is used to lock or unlock the main latch mechanism 4.

[0078] like Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the oblique tongue mechanism 3 includes:

[0079] The latch body 31 is slidably disposed in the lock housing 2. The latch body 31 has a latch portion 311 and a rod portion 312 that are connected to each other.

[0080] The first elastic element 32 is provided in the lock housing 2 and is used to directly or indirectly cooperate with the latch body 31 to make the latch body 31 have a tendency to move outward of the lock housing 2.

[0081] Rotating sleeve 33 is rotatably mounted on the tongue portion 311 and / or the rod portion 312. Rotating sleeve 33 can rotate around the axis of the rod portion 312. When the tongue body 31 slides, it can drive the rotating sleeve 33 to slide synchronously axially. Rotating sleeve 33 has a driving part 331, which is used to cooperate with the locking element 5.

[0082] The latch attachment 34 has a small tongue 341 and a mounting part 342 connected to each other. The mounting part 342 is slidably mounted on the latch body 31. When the latch body 31 slides into the lock housing 2, it can drive the latch attachment 34 to move into the lock housing 2 together. A guide structure is provided between the mounting part 342 and the rotating sleeve 33. The guide structure includes a guide groove 333 and a guide block 3421 extending into the guide groove 333. One of the guide groove 333 and the guide block 3421 is provided on the latch attachment 34, and the other is provided on the rotating sleeve 33. The guide structure is used to make the rotating sleeve 33 rotate relative to the latch attachment 34 when the rotating sleeve 33 moves axially relative to the latch attachment 34, thereby changing the position of the drive part 331; and

[0083] The second elastic element 35, which directly or indirectly cooperates with the oblique tongue attachment 34, is used to give the oblique tongue attachment 34 a tendency to move outward of the lock case 2.

[0084] The oblique tongue mechanism 3 has an open state, a closed but not fully closed state, and a fully closed state; the locking element 5 has a locked state and an unlocked state.

[0085] When the oblique tongue mechanism 3 is in the open state, see Figure 1 The oblique tongue part 311 of the oblique tongue body 31 extends out of the lock housing 2, the small tongue part 341 of the oblique tongue accessory 34 extends out of the lock housing 2, the locking element 5 is in a locked state, and the driving part 331 is offset from the locking element 5.

[0086] When the oblique latch mechanism 3 is in the closed-not-fully-positioned state, see Figure 8 and Figure 9 The tongue portion 311 of the tongue body 31 is pressed and moves into the lock housing 2 and retracts. The tongue attachment 34 also moves into the lock housing 2 and retracts under the action of the tongue body 31.

[0087] When the oblique tongue mechanism 3 is in the closed position, see Figures 11-14 The small tongue 341 of the latch attachment 34 abuts against the buckle plate 1. The latch body 31 slides out of the lock shell 2 under the action of the first elastic member 32. When the latch body 31 slides, it will drive the rotating sleeve 33 to move synchronously. When the rotating sleeve 33 moves relative to the mounting part 342, under the action of the mutually cooperating guide groove 333 and guide block 3421, the rotating sleeve 33 rotates, changing the position of the drive part 331. When the drive part 331 moves along the axial direction of the latch body 31 after changing its position, it will contact the locking element 5, causing the locking element 5 to switch from the locked state to the unlocked state.

[0088] The oblique tongue attachment 34 of this application is slidably disposed on the oblique tongue body 31. Compared with the prior art structure in which the trigger tongue assembly and the oblique tongue assembly are arranged side by side, the structure can be made more compact. The present application can realize the rotation of the rotating sleeve 33 through the guide block 3421, so that after the door is closed, the drive part 331 can contact the locking element 5, so that the locking element 5 switches from the locked state to the unlocked state.

[0089] In practical applications, the locking element 5 can be rotatably installed inside the lock housing 2, or it can be slidably installed inside the lock housing 2. In this embodiment, it is a rotatable fit.

[0090] like Figure 1 The lock body also has a reset elastic element 6 for resetting the locking element 5.

[0091] In this embodiment, the mounting part 342 is slidably mounted on the rod part 312. When the latch mechanism 3 is in the open state, the mounting part 342 abuts against the latch part 311. There are various ways to slide the mounting part 342, such as by sleeve or by using a track.

[0092] like Figure 1 and Figure 6 As shown, the locking element 5 has a clearance opening 51 on one side. When the latch mechanism 3 is in the open state, the drive unit 331 passes through the clearance opening 51. The clearance opening 51 mentioned in this application can be on the locking element 5 or in the external space on one side of the locking element 5.

[0093] like Figures 3 to 6 As shown, in this embodiment, the oblique tongue 311 has a pressure-retracting surface 3111 and a thrust surface 3112. The pressure-retracting surface 3111 is an inclined surface or an arc-shaped surface, and the thrust surface 3112 has a groove 31121. The small tongue 341 slides in conjunction with the groove 31121.

[0094] like Figures 3 to 6 As shown, in this embodiment, the oblique tongue 311 has a pressure-retracting surface 3111 and a thrust surface 3112. The pressure-retracting surface 3111 is an inclined surface or an arc-shaped surface, and the thrust surface 3112 has a groove 31121. The small tongue 341 slides in conjunction with the groove 31121.

[0095] The buckle plate 1 has a limiting hole 11 for the oblique tongue body 31 to be inserted into, and the buckle plate 1 also has a protrusion 12 that extends into the limiting hole 11; the small tongue 341 is fully embedded in the sliding groove 31121. When the oblique tongue mechanism 3 is in the closed position, the oblique tongue body 31 extends into the limiting hole 11 and the small tongue 341 contacts and cooperates with the protrusion 12.

[0096] The small tongue 341 is fully embedded in the slide groove 31121, meaning that the small tongue 341 does not protrude from the slide groove 31121. This setting does not change the thickness of the lock body, that is, the thickness of the lock body will not need to be increased because the small tongue 341 protrudes from the slide groove 31121.

[0097] like Figure 4 and Figure 5 As shown, in this embodiment, the guide groove 333 includes at least a guide portion 3331 that is not parallel to the axis of the rod portion 312. During the period from the closed-not-closed state to the closed-in state, the guide block 3421 moves at least a distance in the guide portion 3331.

[0098] like Figure 4 and Figure 5 As shown, in this embodiment, the guide groove 333 further includes a first part 3332 and a second part 3333, and the first part 3332, the guide part 3331 and the second part 3333 are connected in sequence;

[0099] When the oblique tongue mechanism 3 is in the open state and the closed state, the guide block 3421 is located at the junction of the first part 3332 or the guide part 3331.

[0100] When the oblique tongue mechanism 3 is in the closed position, the guide block 3421 is located at the junction of the second part 3333 or the guide part 3331.

[0101] like Figures 3 to 6 As shown, in this embodiment, the guide groove 333 is disposed on the rotating sleeve 33, and the guide block 3421 is disposed on the mounting part 342;

[0102] The rotating sleeve 33 also has a notch 332;

[0103] The mounting part 342 is mounted on the outside of the rod part 312, the rotating sleeve 33 is sleeved on the outside of the mounting part 342, and the small tongue part 341 protrudes through the notch 332;

[0104] The second elastic element 35 is a spring. The second elastic element 35 is sleeved on the rod portion 312. One end of the second elastic element 35 is engaged with the mounting portion 342, and the other end is engaged with the rotating sleeve 33 or the rod portion 312.

[0105] like Figure 4 and Figure 6 As shown, in this embodiment, the outer wall of the rod 312 has a limiting part 3121, and the rotating sleeve 33 is sleeved on the rod 312 and located between the oblique tongue 311 and the limiting part 3121. In actual use, the limiting part 3121 can be an integral structure with the rod 312, or it can be a retaining spring installed on the rod 312.

[0106] In practical applications, the first elastic element 32 is a spring, tension spring or torsion spring. One end of the first elastic element 32 is engaged with the lock housing 2, and the other end is engaged directly or indirectly with the rod 312.

[0107] like Figures 15-20 As shown, the main bolt mechanism 4 of the lock body includes:

[0108] The main bolt body 41 is slidably disposed on the lock housing 2. The main bolt body 41 has a main bolt portion 411 and a main bolt plate 412 connected to each other. The main bolt plate 412 has a drive groove 4121. The main bolt body 41 has an extended state and a retracted state.

[0109] The main latch actuating block 42 is rotatably mounted on the lock housing 2. The main latch actuating block 42 can rotate around the first rotation axis 43. The main latch actuating block 42 has a driving block 421 that extends into the driving groove 4121. When the main latch actuating block 42 rotates, it can drive the main latch body 41 to slide through the cooperation of the driving block 421 and the driving groove 4121. The main latch actuating block 42 has a first position and a second position. When the main latch actuating block 42 is in the first position, the main latch body 41 is in the extended state. When the main latch actuating block 42 is in the second position, the main latch body 41 is in the retracted state.

[0110] The pull rack 44 is slidably mounted on the lock housing 2. The pull rack 44 is used to directly or indirectly engage with the main lock tongue actuating block 42. When the pull rack 44 slides, it can drive the main lock tongue actuating block 42 to rotate. The pull rack 44 has a locked position and a released position. When the pull rack 44 is in the locked position, the main lock tongue actuating block 42 is in the second position. When the pull rack 44 is in the released position, the main lock tongue actuating block 42 is in the first position. The pull rack 44 has a locking part 441, which is used to cooperate with the locking element 5. When the locking element 5 locks the locking part 441, the pull rack 44 cannot slide and is in the locked position. When the locking element 5 does not lock the locking part 441, the pull rack 44 can slide to the released position after being subjected to force.

[0111] The main latch ejector elastic element 45 is installed inside the lock housing 2 and cooperates with the pull rack 44 to drive the pull rack 44 to slide to the release position when the locking element 5 is not locking the locking part 441.

[0112] In actual use, after the door is closed and the locking element 5 is unlocked, the main latch ejector elastic element 45 drives the rack 44 to move, so that the main latch body 41 automatically pops out and switches to the extended state.

[0113] like Figure 17 and Figure 18As shown, in this embodiment, the main latch mechanism 4 further includes a transmission member 46 rotatably mounted on the lock housing 2. The rotatable member is fixed relative to the main latch actuating block 42, and the rotatable member and the main latch actuating block 42 can rotate synchronously. The transmission member 46 has teeth 461, which pull the rack 44 to mesh with the teeth 461. In practical applications, the transmission member 46 may not be provided. In this case, the main latch actuating block 42 has teeth 461, which pulls the rack 44 to mesh with the teeth 461.

[0114] like Figures 15 to 20 As shown, the main locking bolt mechanism 4 also includes:

[0115] Rotating lever 47 is rotatably mounted on the lock housing 2 and fixed relative to the main lock tongue actuating block 42. It can rotate synchronously with the main lock tongue actuating block 42. Rotating lever 47 has a first mating part 471 provided adjacent to the first rotation axis 43.

[0116] Lock cylinder 48, see Figure 20 Installed on the lock housing 2, the lock cylinder 48 has a lock head cam 481, which has an initial position and an unlocked position;

[0117] A lock cylinder lever 49 is movably mounted on the lock housing 2. The lock cylinder lever 49 has a pressure-receiving portion 491 and a second mating portion 492. The pressure-receiving portion 491 is located on one side of the lock cylinder 48 and adjacent to the lock cylinder cam 481; and

[0118] During the process of the lock head cam 481 rotating from the initial position to the unlock position, the lock head cam 481 contacts and engages with the pressure part 491, driving the lock head lever 49 to move. After the lock head lever 49 moves, the second engagement part 492 contacts and engages with the first engagement part 471, driving the rotating lever 47 and the main lock tongue actuating block 42 to rotate synchronously, so that the main lock tongue body 41 switches from the extended state to the retracted state. At the same time, the main lock tongue actuating block 42 drives the rack 44 to slide to the locking position and lock it with the locking element 5.

[0119] In this application, the main bolt mechanism 4 has a pressure-bearing part 491 located on one side of the lock cylinder 48 and adjacent to the lock head cam 481. The lock head cam 481 can drive the lock head lever 49 to move by rotating a small angle. The first mating part 471 of the main bolt actuating block 42 is located near the first rotation axis 43. In this way, the first mating part 471 only needs to move a small range to achieve a large rotation angle of the main bolt actuating block 42. The combination of the two ("the pressure-bearing part 491 is located on one side of the lock cylinder 48 and adjacent to the lock head cam 481" and "the first mating part 471 is located near the first rotation axis 43") enables the main bolt mechanism 4 to rotate a small angle when unlocked with a key, and the unlocking process takes a short time.

[0120] In this embodiment, when the lock cam 481 rotates from the initial position to the unlocked position, the angle of rotation of the lock cam 481 is less than or equal to 90°.

[0121] like Figure 17 and 18 As shown, in this embodiment, the main latch plate 412 is located between the main latch actuating block 42 and the rotating paddle 47;

[0122] The drive block 421 is mounted on the drive slot 4121;

[0123] One end of the drive block 421 is fixed to the main latch actuating block 42, and the other end is inserted into the rotating paddle 47; or, one end of the drive block 421 is fixed to the rotating paddle 47, and the other end is inserted into the main latch actuating block 42.

[0124] This design ensures even force distribution on the main locking tongue plate 412, resulting in greater stability and reliability during operation.

[0125] In this embodiment, the rotating paddle 47 also has a third mating part 472. The third mating part 472 and the first mating part 471 are both located on the same side of the first rotation axis 43, and the distance of the third mating part 472 from the first rotation axis 43 is greater than the distance of the first mating part 471 from the first rotation axis 43.

[0126] The lock lever 49 has a fourth mating part 493 that mates with the third mating part 472;

[0127] During the process of the lock head cam 481 rotating from the initial position to the unlock position, the lock head cam 481 contacts and engages with the pressure part 491, driving the lock head lever 49 to move. At first, the fourth engagement part 493 of the lock head lever 49 contacts and engages with the third engagement part 472, driving the rotating lever 47 to rotate. Then, the fourth engagement part 493 and the third engagement part 472 no longer contact and engage, but the second engagement part 492 contacts and engages with the first engagement part 471, continuing to drive the rotating lever 47 to rotate, causing the main lock tongue body 41 to switch from the extended state to the retracted state. At the same time, the main lock tongue actuating block 42 drives the rack 44 to slide to the locking position and lock it with the locking element 5.

[0128] The first mating part 471 is located near the first rotation axis 43, which results in a small lever arm. At the beginning of rotation, a large force needs to be applied to the key. This application solves this problem by setting a third mating part 472 (the distance between the third mating part 472 and the first rotation axis 43 is greater than the distance between the first mating part 471 and the first rotation axis 43) and a fourth mating part 493. At the beginning of unlocking, the third mating part 472 and the fourth mating part 493 drive the rotating lever 47 to rotate. Compared with the initial engagement with the first mating part 471, the lever arm is increased, which can drive the rotating lever 47 to rotate better. Then, the fourth mating part 493 no longer engages with the third mating part 472. Instead, the second mating part 492 engages with the first mating part 471 to continue driving the rotating lever 47 to rotate, and finally the main lock tongue body 41 switches from the extended state to the retracted state.

[0129] like Figure 16 As shown, in this embodiment, the first mating part 471 and the third mating part 472 are located on both sides of the lock head lever 49.

[0130] In this embodiment, the lock head lever 49 is slidably disposed on the lock housing 2; the main bolt ejection elastic element 45 is a spring, torsion spring or tension spring.

[0131] The tongue mechanism 3 in this embodiment has an extended state and a retracted state; such as Figure 15 , Figure 16 and Figure 19 As shown, the lock body also includes:

[0132] Handle shaft 71, rotatably mounted on lock housing 2, is used to mount the handle; and

[0133] The handle lever 72 is mounted on the handle shaft 71 and can rotate relative to the handle shaft 71. The handle lever 72 has a fifth mating part 721 and a sixth mating part 722. The fifth mating part 721 is mated with the rod part 312 of the tongue mechanism 3 and is used to switch the tongue mechanism 3 from the extended state to the retracted state.

[0134] The lock cylinder lever 49 also has an unlocking part 494. During the process of the lock cylinder cam 481 rotating from the initial position to the unlocking position, the lock cylinder cam 481 contacts and engages with the second pressure part 491, driving the lock cylinder lever 49 to move. After the lock cylinder lever 49 moves, the main bolt body 41 switches from the extended state to the retracted state. At the same time, the main bolt actuating block 42 drives the rack 44 to slide to the locking position and lock it with the locking element 5. Meanwhile, the unlocking part 494 abuts against the sixth engaging part 722, causing the handle lever 72 to rotate. Finally, the fifth engaging part 721 of the handle lever 72 causes the latch mechanism 3 to switch from the extended state to the retracted state.

[0135] Example 2

[0136] like Figures 21-23 As shown, the difference between this embodiment and Embodiment 1 is that:

[0137] The end of the small tongue 341 away from the mounting part 342 has a protruding block 3411 with a protruding groove 31121. The lock housing 2 has a relief groove 21 for the protruding block 3411 to be inserted. When the latch mechanism 3 is in the closed position, the protruding block 3411 abuts against the buckle plate 1, and at least part of the protruding block 3411 is inserted into the relief groove 21.

[0138] The small tongue 341 has a portion that protrudes from the slide groove 31121. This arrangement does not change the buckle plate 1 (the buckle plate 1 comes in various styles, and not changing the buckle plate 1 can effectively reduce the installation efficiency and cost of the lock body). When the latch mechanism 3 is in the open state, the latch body 31 extends into the limiting hole 11 of the buckle plate 1, and because the small tongue 341 has a portion that protrudes from the slide groove 31121, this protruding portion can continue to contact the buckle plate 1, so that the latch attachment 34 is in the retracted state.

[0139] The small tongue 341 is designed in this way, which, compared to other structural forms, does not increase the thickness of the lock body, and does not require special design for the strike plate 1.

[0140] like Figure 21 and Figure 23 As shown, in this embodiment, the protrusion 3411 has an inclined or arc-shaped first guide surface 34111 on the side near the mounting part 342. The further away the protrusion 3411 is from the slide groove 31121, the smaller the thickness of the protrusion 3411. The clearance groove 21 has a second guide surface 211 that is adapted to the guide surface.

[0141] The cooperation between the first guide surface 34111 and the second guide surface 211 will not affect the insertion of the protruding block 3411 into the clearance groove 21 when the latch mechanism 3 is in the closed position. However, it can reduce the amount of material that needs to be removed from the lock shell 2 due to the clearance groove 21, thus ensuring the structural strength of the lock body. That is, if the first guide surface 34111 and the second guide surface 211 are not provided, the protruding block 3411 will be a block of a certain thickness. In this case, a larger clearance groove 21 would be required, which would remove more material and affect the structural strength.

[0142] The above description is only a preferred embodiment of the present utility model and does not limit the scope of patent protection of the present utility model. Any equivalent structural transformations made based on the content of the present utility model specification and drawings, whether directly or indirectly applied to other related technical fields, are similarly included within the scope of protection of the present utility model.

Claims

1. A latch mechanism for a lock body, the lock body being used to cooperate with a strike plate mounted on a door frame, the lock body comprising a lock housing, a main latch mechanism, and a locking element movably mounted on the lock housing, the locking element being used to lock or unlock the main latch mechanism, characterized in that, The latch mechanism of the lock body includes: The latch body is slidably mounted on the lock housing, and the latch body has a latch portion and a rod portion that are connected to each other; The first elastic element is disposed in the lock housing and is used to directly or indirectly cooperate with the main body of the latch, so that the main body of the latch has a tendency to move outward of the lock housing. A rotating sleeve is rotatably mounted on the tongue and / or rod. The rotating sleeve can rotate about the axis of the rod. When the tongue body slides, it can drive the rotating sleeve to slide synchronously axially. The rotating sleeve has a driving part, which is used to cooperate with the locking element. A latch attachment has a small tongue and a mounting part connected to each other. The mounting part is slidably disposed on the latch body. When the latch body slides into the lock housing, it can drive the latch attachment to move into the lock housing together. A guide structure is provided between the mounting part and the rotating sleeve. The guide structure includes a guide groove and a guide block extending into the guide groove. One of the guide groove and the guide block is disposed on the latch attachment, and the other is disposed on the rotating sleeve. The guide structure is used to enable the rotating sleeve to rotate relative to the latch attachment when the rotating sleeve moves axially relative to the latch attachment, thereby changing the position of the driving part; and The second elastic element, which directly or indirectly cooperates with the latch attachment, is used to give the latch attachment a tendency to move outward of the lock case. The latch mechanism has an open state, a closed but not fully closed state, and a fully closed state; the locking element has a locked state and an unlocked state. When the latch mechanism is in the open state, the latch portion of the latch body extends out of the lock housing, the small tongue portion of the latch accessory extends out of the lock housing, the locking element is in the locked state, and the driving part is offset from the locking element; When the latch mechanism is in the closed but not fully closed state, the latch part of the latch body is pressed and moves back into the lock housing, and the latch attachment also moves back into the lock housing under the action of the latch body. When the latch mechanism is in the closed position, the small tongue of the latch accessory abuts against the buckle plate, and the latch body slides out of the lock case under the action of the first elastic element. When the latch body slides, it will drive the rotating sleeve to move synchronously. When the rotating sleeve moves relative to the mounting part, under the action of the mutually cooperating guide groove and guide block, the rotating sleeve rotates, changing the position of the driving part. During the movement of the driving part along the axial direction of the latch body after the position is changed, it will contact the locking element, so that the locking element switches from the locked state to the unlocked state.

2. The latch mechanism of the lock body as described in claim 1, characterized in that, The mounting part is slidably mounted on the rod part, and when the latch mechanism is in the open state, the mounting part abuts against the latch part; The locking element has a clearance opening on one side, and when the latch mechanism is in the open state, the driving part passes through the clearance opening.

3. The latch mechanism of the lock body as described in claim 1, characterized in that, The oblique tongue has a pressure-retracting surface and a thrust surface. The pressure-retracting surface is an inclined surface or an arc surface. The thrust surface has a groove, and the small tongue slides in conjunction with the groove. The small tongue has a portion that protrudes from the slide groove. When the oblique tongue mechanism is in the closed position, the end face of the portion of the small tongue that protrudes from the slide groove contacts and engages with the buckle plate. The small tongue has a protruding block with a protruding groove at one end away from the mounting part. The lock housing has a clearance groove for the protruding block to be inserted. When the latch mechanism is in the closed position, the protruding block abuts against the buckle plate, and at least part of the protruding block is inserted into the clearance groove.

4. The latch mechanism of the lock body as described in claim 3, characterized in that, The protrusion has an inclined or arc-shaped first guide surface on the side near the mounting part. The further away the protrusion is from the slide groove, the smaller its thickness. The clearance groove has a second guide surface that matches the guide surface.

5. The latch mechanism of the lock body as described in claim 1, characterized in that, The oblique tongue has a pressure-retracting surface and a thrust surface. The pressure-retracting surface is an inclined surface or an arc surface. The thrust surface has a groove, and the small tongue slides in conjunction with the groove. The buckle plate has a limiting hole for the latch body to be inserted into, and the buckle plate also has a protrusion that extends into the limiting hole; the small tongue is fully embedded in the sliding groove, and when the latch mechanism is in the closed position, the latch body extends into the limiting hole and the small tongue contacts and engages with the protrusion.

6. The latch mechanism of the lock body as described in claim 1, characterized in that, The guide groove includes at least a guide portion that is not parallel to the axis of the rod. During the period from the closed-not-closed state to the closed-in state, the guide block moves at least a certain distance in the guide portion.

7. The latch mechanism of the lock body as described in claim 6, characterized in that, The guide groove further includes a first part and a second part, which are connected in sequence. When the latch mechanism is in the open state and the closed state, the guide block is located at the first part or at the junction of the first part and the guide part. When the oblique tongue mechanism is in the closed position, the guide block is located at the second part or at the junction of the second part and the guide part.

8. The latch mechanism of the lock body as described in claim 1, characterized in that, The guide groove is provided on the rotating sleeve, and the guide block is provided on the mounting part; The rotating sleeve also has a notch; The mounting part is installed on the outside of the rod, the rotating sleeve is fitted on the outside of the mounting part, and the small tongue protrudes through the notch; The second elastic element is a spring, which is sleeved on the rod. One end of the second elastic element is engaged with the mounting part, and the other end is engaged with the rotating sleeve or the rod.

9. The latch mechanism of the lock body as described in claim 1, characterized in that, The outer wall of the rod has a limiting part, and the rotating sleeve is fitted over the rod and located between the oblique tongue and the limiting part; The first elastic element is a spring, tension spring, or torsion spring. One end of the first elastic element is engaged with the lock housing, and the other end is engaged directly or indirectly with the rod.

10. A lock body, characterized in that, The latch mechanism of the lock body as described in any one of claims 1 to 9.

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