A door lock head

Abstract

An interior door lock includes an interior seat fixed to an inner door panel. An inner rotating cylinder is rotatably mounted on the central hole of the interior seat. A recessed lock groove is provided on the end face of the inner rotating cylinder, penetrating the cylindrical surface of the inner rotating cylinder. A first latch plate and a second latch plate are slidably mounted within the lock groove. A spring is provided between the first and second latch plates. A first hook is provided at the inner end of the first latch plate, and a second hook is provided at the inner end of the second latch plate. The advantages of this invention are: it can be effectively covered by an external decorative cover. Compared to the large decorative covers used in the prior art to conceal the bulky interior door seat, the decorative cover of this invention can be designed to be more exquisite and stylish. This completely changes the "bulky and dull" appearance of traditional spherical locks, making the overall shape of the door lock more compact, refined, and beautiful.

Description

Technical Field

[0001] This utility model relates to the field of door lock technology, specifically an internal door lock. Background Technology

[0002] Currently, there are many types of door locks on the market, among which spherical locks are widely popular due to their ease of operation. However, existing spherical locks often have some design shortcomings. For example, in many existing technical solutions, in order to achieve the unlocking function of the lock body, its unlocking mechanism is usually directly set on the inner seat connected to the inner surface of the door panel. This design requires the inner seat to accommodate a complex unlocking mechanical structure, thus inevitably making its size relatively large.

[0003] Furthermore, due to the large volume of the inner seat, a large decorative cover is often needed to cover it in order to maintain the overall aesthetics of the lock and conceal the internal mechanical structure. This "bigger for bigger" design concept makes the appearance of existing spherical locks generally appear bulky and rigid, making it difficult to meet the requirements of modern home decoration for the aesthetics and refinement of door locks, and also limiting the application of door locks on doors of different design styles. Therefore, it is necessary to further improve them. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of existing technologies and provide an interior door lock that is simple and compact in structure, low in manufacturing cost, and neat and beautiful in appearance.

[0005] The purpose of this utility model is achieved by the following method: an inner door lock, which includes an inner door seat fixed to an inner door panel, an inner rotating cylinder rotatably installed on the central hole of the inner door seat, a recessed lock groove provided on the end face of the inner rotating cylinder, the lock groove being provided through the cylindrical surface of the inner rotating cylinder, a first lock tongue plate and a second lock tongue plate slidably installed in the lock groove, and a spring provided between the first lock tongue plate and the second lock tongue plate to push the first lock tongue plate and the second lock tongue plate to move apart; The first locking tongue plate has a first hook at its inner end and the second locking tongue plate has a second hook at its inner end, with the first hook and the second hook being arranged opposite to each other. It also includes a guide cylinder installed on the inner end face of the inner rotating cylinder. A square guide hole is provided at the center of the guide cylinder. An anti-locking shaft is axially slidably installed in the square guide hole. A barb is provided on the anti-locking shaft corresponding to the first hook and the second hook. The barb can be hooked with the first hook and the second hook simultaneously. A push spring is provided between the anti-locking shaft and the guide cylinder. The push spring pushes the anti-locking shaft to always move away from the first hook and the second hook. The anti-locking shaft is also provided with a locking shaft. After the locking shaft passes through the first locking hole on the guide cylinder and the second locking hole on the inner rotating cylinder, it connects with or separates from the fixing hole on the inner seat of the door. It also includes an unlocking sleeve fitted outside the inner rotating cylinder and the guide cylinder. The inner hole of the unlocking sleeve has an unlocking groove corresponding to the lock groove position. The first lock tongue plate and the second lock tongue plate can pass through the inner rotating cylinder and extend into the unlocking groove.

[0006] Furthermore: a turntable is provided at the inner end of the inner rotating cylinder, and a guide groove is provided in the concave end face of the turntable. A first sliding plate and a second sliding plate are slidably installed in the guide groove. The first locking tongue plate is provided on the outer end of the first sliding plate, and the second locking tongue plate is provided on the outer end of the second sliding plate. The first hook is provided on the inner end of the first sliding plate, and the second hook is provided on the inner end of the second sliding plate.

[0007] Furthermore: the unlocking sleeve is fitted with a decorative cover that rotates coaxially with it, a guide plate is provided inside the decorative cover, a guide hole is provided at the center of the guide plate, a guide shaft is provided at the inner end of the anti-locking shaft extending into the guide hole, and an anti-locking plate is connected to the inner end of the guide shaft, the anti-locking plate covers the inner hole of the decorative cover.

[0008] Furthermore: the inner end of the unlocking sleeve is provided with an inner connecting plate, and the inner end of the guide cylinder is provided with a middle connecting plate. The inner connecting plate is connected to the guide plate, and the middle connecting plate is clamped between the inner connecting plate and the guide plate.

[0009] Furthermore: the middle connecting plate is provided with a clearance area, and the connecting screw passes through the guide plate and the clearance area and then connects to the inner connecting plate.

[0010] Furthermore: the outer end of the inner rotating cylinder extends a limiting post towards the inner door seat, and correspondingly: the inner door seat is provided with a limiting area towards the inner rotating cylinder, and the limiting post extends into the limiting area to limit the rotation angle of the inner rotating cylinder.

[0011] Furthermore: a first guide surface A is provided on the opposite surface of the first hook and the second hook and the barb, and a second guide surface B is provided on the barb corresponding to the first guide surface A.

[0012] Furthermore: a square rod is fixedly installed on the inner rotating cylinder, the square rod is connected to the lock body and the door lock head, and an unlocking plate is rotatably installed inside the square rod. One end of the unlocking plate is connected to the lock cylinder inside the door lock head, and the other end of the unlocking plate extends into the space between the first lock tongue plate and the second lock tongue plate, driving the first lock tongue plate and the second lock tongue plate to move relative to each other.

[0013] Furthermore, the unlocking groove is an arc-shaped groove, and correspondingly, the first locking tongue plate and the second locking tongue plate are round-headed and cooperate with the unlocking groove.

[0014] Furthermore, the guide shaft is also provided with an axial limiting disc, which covers the outside of the central hole to limit the maximum axial displacement of the guide shaft.

[0015] The beneficial effects of this utility model are: 1. It has a simple and compact structure and low manufacturing cost.

[0016] 2. The core innovation of this utility model lies in the innovative placement of the unlocking mechanism, which is typically located on the inner door seat in existing technologies, inside the decorative cover. This design eliminates the need for the inner door seat to accommodate complex unlocking components, thereby significantly reducing its size. This reduction in the inner door seat's size not only optimizes the internal space layout but also provides more possibilities for the integration of subsequent components.

[0017] 3. Because the volume of the inner door seat is significantly reduced, this invention only requires an external decorative cover to effectively cover it. Compared to the large decorative covers that must be used in the prior art to conceal the bulky inner door seat, the decorative cover of this invention can be designed to be more exquisite and stylish. This completely changes the "bulky and dull" appearance of traditional spherical locks, making the overall shape of the lock more compact, delicate, and beautiful, better integrating into modern home decoration styles and enhancing the overall quality of the living environment.

[0018] 4. The decorative cover in this utility model not only serves an aesthetic purpose but also cleverly functions as an interior door handle, making it convenient for users to grip and turn. More importantly, the ingenious combination of the decorative cover and the unlocking mechanism enables the unlocking function. This integrated design reduces separate unlocking components, further simplifies the lock structure, and improves the intuitiveness and convenience of operation. Attached Figure Description

[0019] Figure 1 This is a rendering of the final assembly of this utility model.

[0020] Figure 2 This is a cross-sectional view of the structure of this utility model.

[0021] Figure 3 This is a longitudinal structural cross-sectional view of the present invention.

[0022] Figure 4 , 5 Figures 6 and 7 are exploded views of the present invention.

[0023] Figure 7 This is a cross-sectional view of the first tongue plate and the second locking tongue plate in this utility model.

[0024] Figure 8 This is an assembly diagram of the anti-locking shaft, the first tongue plate, and the second locking tongue plate in this utility model.

[0025] Figure 9 This is a schematic diagram of the structure of the first tongue plate and the second locking tongue plate in this utility model. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings. An inner door lock includes an inner door seat 1 fixed to an inner door panel. An inner rotating cylinder 2 is rotatably mounted on the central hole 11 of the inner door seat 1. A recessed lock groove 21 is provided on the end face of the inner rotating cylinder 2, penetrating the cylindrical surface of the inner rotating cylinder 2. A first locking tongue plate 3 and a second locking tongue plate 4 are slidably mounted within the lock groove 21. A spring 5 is provided between the first locking tongue plate 3 and the second locking tongue plate 4, pushing the first locking tongue plate 3 and the second locking tongue plate 4 to move apart. The inner end of the first locking tongue plate 3 is provided with a first hook 31, and the inner end of the second locking tongue plate 4 is provided with a second hook 41. The first hook 31 and the second hook 41 are arranged opposite to each other. It also includes a guide cylinder 6 installed on the inner end face of the inner rotating cylinder 2. A square guide hole 61 is provided at the center of the guide cylinder 6. A locking shaft 7 is axially slidably installed in the square guide hole 61. A barb 71 is provided on the locking shaft 7 corresponding to the first hook 31 and the second hook 41. The barb 71 can be hooked with the first hook 31 and the second hook 41 simultaneously. A push spring 72 is provided between the locking shaft 7 and the guide cylinder 6. The push spring 72 pushes the locking shaft 7 to always move away from the first hook 31 and the second hook 41. The anti-locking shaft 7 is also provided with a locking shaft 73. After passing through the first locking hole 66 on the guide cylinder 6 and the second locking hole 28 on the inner rotating cylinder 2, the locking shaft 73 is either connected to or separated from the fixing hole 12 on the inner door seat 1. It also includes an unlocking sleeve 8 that is fitted outside the inner rotating cylinder 2 and the guide cylinder 6. An unlocking groove 81 is provided on the inner hole of the unlocking sleeve 8 corresponding to the position of the lock groove 21. The first locking tongue plate 3 and the second locking tongue plate 4 can pass through the inner rotating cylinder 2 and extend into the unlocking groove 81.

[0027] In one embodiment: a turntable 22 is provided at the inner end of the inner rotating cylinder 2, and a guide groove 23 is provided in the concave end face of the turntable 22. A first sliding plate 32 and a second sliding plate 42 are slidably installed in the guide groove 23. A first locking tongue plate 3 is provided on the outer end of the first sliding plate 32, and a second locking tongue plate 4 is provided on the outer end of the second sliding plate 42. A first hook 31 is provided on the inner end of the first sliding plate 32, and a second hook 41 is provided on the inner end of the second sliding plate 42.

[0028] In one embodiment: the unlocking sleeve 8 is fitted with a decorative cover 9 that rotates coaxially with it. A guide plate 91 is provided inside the decorative cover 9. A guide hole 92 is provided at the center of the guide plate 91. A guide shaft 74 is provided at the inner end of the anti-locking shaft 7 and extends into the guide hole 92. An anti-locking plate 76 is connected to the inner end of the guide shaft 74 and covers the inner hole of the decorative cover 9.

[0029] In one embodiment: the inner end of the unlocking sleeve 8 is provided with an inner connecting plate 82, the inner end of the guide cylinder 6 is provided with a middle connecting plate 63, the inner connecting plate 82 is connected to the guide plate 91, and the middle connecting plate 63 is clamped between the inner connecting plate 82 and the guide plate 91.

[0030] In one embodiment: the middle connecting plate 63 is provided with a clearance area 64, and the connecting screw 65 passes through the guide plate 91 and the clearance area 64 and is connected to the inner connecting plate 82.

[0031] In one embodiment: the outer end of the inner rotating cylinder 2 extends a limiting post 24 towards the inner door seat 1, and correspondingly: the inner door seat 1 is provided with a limiting area 13 towards the inner rotating cylinder 2, and the limiting post 24 extends into the limiting area 13 to limit the rotation angle of the inner rotating cylinder 2.

[0032] In one embodiment: a first guide surface A is provided on the opposite surface of the first hook 31 and the second hook 41 and the barb 71, and a second guide surface B is provided on the barb 71 corresponding to the first guide surface A.

[0033] In one embodiment: a square rod 25 is fixedly installed on the inner rotating cylinder 2. The square rod 25 is connected to the lock body and the door lock head 27. An unlocking plate 26 is rotatably installed inside the square rod 25. One end of the unlocking plate 26 is connected to the lock cylinder inside the door lock head 27. The other end of the unlocking plate 26 extends into the space between the first lock tongue plate 3 and the second lock tongue plate 4, driving the first lock tongue plate 3 and the second lock tongue plate 4 to move relative to each other.

[0034] In one embodiment: the unlocking groove 81 is an arc-shaped groove, and correspondingly, the first locking tongue plate 3 and the second locking tongue plate 4 are round-headed and cooperate with the unlocking groove 81.

[0035] In one embodiment, the guide shaft 74 is further provided with an axial limiting disk 75, which covers the outside of the central hole 11 and limits the maximum axial displacement of the guide shaft 74.

[0036] Working principle: The door lock cylinder provided by this utility model is characterized by its ingenious structural design, achieving a perfect combination of compact appearance, highly integrated functions, and smooth and reliable operation. Its complete working principle can be summarized as follows: When the door is locked from the inside: The user presses the deadbolt plate 76 inward, which pushes the deadbolt axis to move axially outward. The barb on the deadbolt axis uses the second guide surface B to push the first guide surface A on the first hook and the second hook, thereby pushing the first slide plate and the second slide plate to drive the first latch and the second latch to move radially away, extending out of the lock groove 21 and into the unlocking groove 81. When the deadbolt axis is pressed into place, the barb engages with the first hook and the second hook, locking the axial position of the deadbolt axis. Simultaneously, as the deadbolt axis moves outward, the locking shaft 73 on the deadbolt axis 7 passes through the lock holes on the guide cylinder 6 and the inner rotating cylinder 2 in sequence, and aligns with the fixing hole 12 on the inner door seat 1, coaxially connecting the deadbolt axis 7, the guide cylinder, and the inner rotating cylinder to the inner door seat, preventing them from rotating and firmly locking them in the deadbolt position, ensuring that the door cannot be opened from the outside.

[0037] Unlocking from the inside: The unlocking operation from the inside is mainly achieved through the decorative cover 9. When the user rotates the decorative cover 9, since it is coaxially fitted with the unlocking sleeve 8, the unlocking sleeve 8 also rotates. The arc-shaped unlocking groove 81 on the inner hole of the unlocking sleeve 8 will precisely contact the end of the round-headed lock tongue plate, and through the squeezing action, the lock tongue plate will retract inward. When the lock tongue plate retracts, it will drive the first hook and the second hook to move apart through the first and second sliding plates, causing them to release the barb on the deadbolt shaft. Under the action of the push spring 72, the deadbolt shaft will push the deadbolt shaft to move inward, pushing the locking shaft to reset and disengage from the fixing hole 12 on the inner door seat 1, releasing the coaxial lock between the inner rotating cylinder and the inner door seat. The decorative cover can then drive the inner rotating cylinder to rotate the square rod through the guide cylinder, thereby driving the lock body to unlock and open the door. At the same time, the deadbolt shaft will also push the deadbolt plate 76 to move inward and reset, making it flush with the end face of the decorative cover, which serves as an unlocking indicator.

[0038] Unlocking via external key: Typically, the external lock cylinder 27 contains a lock cylinder. After the key unlocks the lock cylinder, the cylinder drives the unlocking plate to rotate. In the deadbolt state, the unlocking plate is held between the first and second hooks. Therefore, when the unlocking plate rotates, it pushes the first and second hooks outwards, releasing the barbs on the deadbolt shaft. Under the action of the push spring 72, the deadbolt shaft moves inwards, pushing the locking shaft back to its original position and disengaging from the fixing hole 12 on the inner door seat 1, thus releasing the coaxial lock between the inner rotating cylinder and the inner door seat. After unlocking, the user can rotate the external lock cylinder 27, which drives the square rod 25 to rotate, thereby unlocking the lock body and opening the door.

[0039] Compared to traditional technologies, this case cleverly integrates the anti-locking function into operational aesthetics: when the user operates the anti-locking plate 76 covering the inner hole of the decorative cover 9, the anti-locking plate 76, through the guide shaft 74, has its axial displacement limited by the axial limiting plate 75 and the outer side of the center hole 11, driving the anti-locking shaft 7 to move axially against the elastic force of the push spring 72. Once the anti-locking shaft 7 moves to the preset position, the barb 71 on it will precisely engage with the hook at the inner end of the latch plate, and the smooth and reliable engagement is ensured through the cooperation of the first guide surface A and the second guide surface B.

[0040] In summary, the most significant technical highlight of this invention lies in its ingenious integration of the traditionally bulky unlocking and locking mechanisms, located inside the door seat, into or within an aesthetically pleasing decorative cover 9. This significantly reduces the size of the door seat 1, completely transforming the bulky and rigid appearance of existing spherical locks and giving the lock a compact, refined, and stylish aesthetic. Furthermore, the decorative cover 9 is no longer merely decorative; it functions as both a door handle and a driver for unlocking / locking, achieving a high degree of functional integration and greatly enhancing user convenience and overall user experience. Through precise mechanical design and ingenious coordination between components, this invention not only solves the pain points of existing technologies but also achieves significant improvements in appearance, operational feel, reliability, and service life, giving it strong market competitiveness.

[0041] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component 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 utility model. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A door lockset, characterized by: It includes an inner door seat (1) fixed to the inner door panel, an inner rotating cylinder (2) is rotatably installed on the center hole (11) of the inner door seat (1), and a recessed lock groove (21) is provided on the end face of the inner rotating cylinder (2). The lock groove (21) is provided through the cylindrical surface of the inner rotating cylinder (2). A first lock tongue plate (3) and a second lock tongue plate (4) are slidably installed in the lock groove (21). A spring (5) is provided between the first lock tongue plate (3) and the second lock tongue plate (4) to push the first lock tongue plate (3) and the second lock tongue plate (4) to move apart. The inner end of the first locking tongue plate (3) is provided with a first hook (31), and the inner end of the second locking tongue plate (4) is provided with a second hook (41). The first hook (31) and the second hook (41) are arranged opposite to each other. It also includes a guide cylinder (6) installed on the inner end face of the inner rotating cylinder (2). A square guide hole (61) is provided at the center of the guide cylinder (6). A locking shaft (7) is axially slidably installed in the square guide hole (61). A barb (71) is provided on the locking shaft (7) corresponding to the first hook (31) and the second hook (41). The barb (71) can be hooked with the first hook (31) and the second hook (41) simultaneously. A push spring (72) is provided between the locking shaft (7) and the guide cylinder (6). The push spring (72) pushes the locking shaft (7) to always move away from the first hook (31) and the second hook (41). The anti-locking shaft (7) is also provided with a locking shaft (73). After the locking shaft (73) passes through the first locking hole (66) on the guide cylinder (6) and the second locking hole (28) on the inner rotating cylinder (2), it connects with or separates from the fixing hole (12) on the inner seat (1). It also includes an unlocking sleeve (8) fitted outside the inner rotating cylinder (2) and the guide cylinder (6). The unlocking sleeve (8) has an unlocking groove (81) on its inner hole corresponding to the lock groove (21). The first locking tongue plate (3) and the second locking tongue plate (4) can pass through the inner rotating cylinder (2) and extend into the unlocking groove (81).

2. A door lockset according to claim 1, wherein: The inner end of the inner rotating cylinder (2) is provided with a turntable (22), and the end face of the turntable (22) is recessed with a guide groove (23). The first slide plate (32) and the second slide plate (42) are slidably installed in the guide groove (23). The first locking tongue plate (3) is provided on the outer end of the first slide plate (32), and the second locking tongue plate (4) is provided on the outer end of the second slide plate (42). The first hook (31) is provided on the inner end of the first slide plate (32), and the second hook (41) is provided on the inner end of the second slide plate (42).

3. A door lockset according to claim 1, wherein: The unlocking sleeve (8) is fitted with a decorative cover (9) that rotates coaxially with it. A guide plate (91) is provided inside the decorative cover (9). A guide hole (92) is provided at the center of the guide plate (91). A guide shaft (74) is provided at the inner end of the anti-locking shaft (7) and extends into the guide hole (92). An anti-locking plate (76) is connected to the inner end of the guide shaft (74). The anti-locking plate (76) covers the inner hole of the decorative cover (9).

4. A door lockset according to claim 3, wherein: The inner end of the unlocking sleeve (8) is provided with an inner connecting plate (82), and the inner end of the guide cylinder (6) is provided with a middle connecting plate (63). The inner connecting plate (82) is connected to the guide plate (91), and the middle connecting plate (63) is clamped between the inner connecting plate (82) and the guide plate (91).

5. A door lockset according to claim 4 wherein: The middle connecting plate (63) is provided with a clearance area (64), and the connecting screw (65) passes through the guide plate (91) and the clearance area (64) and then connects to the inner connecting plate (82).

6. A door lockset core according to claim 1, wherein: The outer end of the inner rotating cylinder (2) extends a limiting post (24) towards the inner door seat (1). Correspondingly, the inner door seat (1) is provided with a limiting area (13) towards the inner rotating cylinder (2), and the limiting post (24) extends into the limiting area (13) to limit the rotation angle of the inner rotating cylinder (2).

7. A door lockset core according to claim 1 wherein: The first hook (31) and the second hook (41) are provided with a first guide surface (A) on the opposite surface of the barb (71), and a second guide surface (B) is provided on the barb (71) corresponding to the first guide surface (A).

8. A door lock cylinder according to claim 1, characterized in that: A square rod (25) is fixedly installed on the inner rotating cylinder (2). The square rod (25) is connected to the lock body and the door lock head (27). An unlocking plate (26) is rotatably installed inside the square rod (25). One end of the unlocking plate (26) is connected to the lock cylinder inside the door lock head (27). The other end of the unlocking plate (26) extends into the space between the first lock tongue plate (3) and the second lock tongue plate (4), driving the first lock tongue plate (3) and the second lock tongue plate (4) to move relative to each other.

9. A door lockset core according to claim 1 wherein: The unlocking groove (81) is an arc groove, and correspondingly, the first locking tongue plate (3) and the second locking tongue plate (4) are round-headed and cooperate with the unlocking groove (81).

10. A door lockset core according to claim 3 wherein: The guide shaft (74) is also provided with an axial limiting disk (75), which covers the outside of the central hole (11) and limits the maximum axial displacement of the guide shaft (74).

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