A door handle

Abstract

The utility model discloses a door handle, including handle unit, including first handle and second handle, first handle installs in the one side of door body, and second handle installs in the other side of door body, lock body unit, including first tapper and square stick, first tapper one end and first handle abut, the other end and second handle abut, and square stick is sleeved in first tapper outside, wherein, when lock body unit is in locking state, square stick and second handle separate, to avoid second handle drive square stick rotation, when lock body unit is in unlocking state, square stick and second handle transmission connection, make second handle rotation drive square stick rotation. Can only rely on mechanical cooperation to realize reliable clutch function, ensure the convenience when using device.

Description

Technical Field

[0001] This utility model relates to the field of door lock accessories technology, and in particular to a door handle. Background Technology

[0002] In existing building door and window hardware systems, door handles, as the most direct interaction component between the user and the door lock mechanism, have a structural design that not only affects the user experience but also relates to the security and reliability of the door lock system. Traditional door handles typically consist of inner and outer handles installed on both sides of the door, connected to and linked to the lock body via a square bar to achieve the opening or closing operation. However, this type of structure generally has a significant drawback: when the door lock is in the locked state, the outer handle may still indirectly drive the bolt through the square bar, thus posing a risk of being unlocked by technical means or forcibly pressed open. This problem is particularly prominent in residential buildings, hotels, and other places with high security requirements. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a door handle that can reliably achieve clutch function through mechanical cooperation alone, ensuring the convenience of use of the device.

[0004] A door handle according to a first aspect of the present invention includes: a handle unit including a first handle and a second handle, wherein the first handle is installed on one side of the door body and the second handle is installed on the other side of the door body; The lock body unit includes a first push rod and a square bar. One end of the first push rod abuts against the first handle, and the other end abuts against the second handle. The square bar is sleeved on the outside of the first push rod. When the lock body unit is in the locked state, the square bar is separated from the second handle to prevent the second handle from driving the square bar to rotate; when the lock body unit is in the unlocked state, the square bar is connected to the second handle, so that the second handle rotates and drives the square bar to rotate.

[0005] A door handle according to an embodiment of this utility model has at least the following beneficial effects: By setting a first push rod between a first handle and a second handle, and sleeved a square bar on the outside of the first push rod, controllable switching of the transmission relationship between the second handle and the square bar is achieved. When the lock body unit is in the locked state, the square bar is separated from the second handle. At this time, even if the user rotates the second handle, the second handle can only rotate freely and cannot form an effective transmission connection with the square bar. Therefore, it cannot drive the square bar to rotate, completely cutting off the possible path of controlling the lock body from the outside of the door, effectively preventing illegal opening or technical unlocking, and significantly improving the anti-theft and security performance of the door lock system. In the unlocked state, the square bar and the second handle establish a reliable transmission connection, so that when the second handle rotates, it can directly drive the square bar to rotate synchronously, thereby normally driving the bolt to complete the door opening action, ensuring the convenience of daily use and the reliability of operation response. This structure is entirely based on the mechanical linkage principle, without the need for electronic control or complex components, and has the advantages of simple structure, precise action, high stability, and strong durability.

[0006] According to some embodiments of the present invention, the lock body unit further includes a second push rod. The first handle has a first unlocking hole. The second push rod is movably installed in the first unlocking hole and is positioned toward the first push rod. When the second push rod pushes the first push rod to move axially toward the second handle, the lock body unit switches to the unlocked state. When the second push rod moves away from the first push rod, the lock body unit switches to the locked state.

[0007] According to some embodiments of the present invention, the first handle is further provided with a bearing component, the second push rod passes through the central hole of the bearing component, and a limit block is provided at the end of the second push rod to prevent the second push rod from coming out of the first unlocking hole.

[0008] According to some embodiments of the present invention, the lock body unit further includes a first return spring, which is sleeved on the outside of the first top rod and is used to provide circumferential return torque to the first handle.

[0009] According to some embodiments of this utility model, the lock body unit further includes an inner steel head, which is installed inside the first handle. The first return spring is installed inside the inner steel head, and the first push rod and the square bar are both accommodated inside the inner steel head. When the first handle rotates, it drives the inner steel head to rotate synchronously, thereby driving the square bar to rotate through the inner steel head.

[0010] According to some embodiments of this utility model, the end of the inner steel head is provided with a guide slope and a limiting groove is formed in the circumferential direction. The outer side wall of the square bar is provided with a guide block corresponding to the guide slope. In the locked state, the guide block is fitted into the limiting groove. When the inner steel head rotates, the guide slope pushes the guide block, causing the square bar to move axially, thereby causing the guide block to disengage from the limiting groove and realizing automatic unlocking.

[0011] According to some embodiments of the present invention, the handle unit further includes a square sleeve, which is movably disposed inside the second handle and is connected to the second handle in a transmission manner. The square sleeve is provided with a square hole that is adapted to the square rod. When the square rod is inserted into the square hole, the second handle is rotatably connected to the square rod through the square sleeve.

[0012] According to some embodiments of the present invention, the second handle is provided with a second unlocking hole, which corresponds to the square sleeve.

[0013] According to some embodiments of the present invention, the lock body unit further includes a second return spring, which is disposed inside the second handle and is used to drive the square sleeve to move axially away from the square bar.

[0014] According to some embodiments of the present invention, the end of the first push rod facing the square sleeve is formed as a cylindrical surface, and the cylindrical surface abuts against the square sleeve, so that the first push rod will not drive the square sleeve to move axially when rotating.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of a door handle according to an embodiment of the present utility model; Figure 2 This is a cross-sectional schematic diagram of a door handle according to an embodiment of the present utility model; Figure 3 This is an exploded view of a door handle according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of the lock body unit according to an embodiment of the present utility model; Figure 5 This is a schematic diagram of the internal structure of the lock body unit according to an embodiment of the present utility model; Figure 6 This is a schematic diagram of the inner steel head according to an embodiment of the present utility model.

[0017] Reference numerals: First handle 100; Second handle 110; Second push rod 120; Square bar 130; First push rod 140; First return spring 150; Bearing component 160; Limiting block 170; Second return spring 180; Square sleeve 190; Second unlocking hole 200; Inner steel head 210; Guide slope 220; Limiting groove 230; Guide block 240. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional 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 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 utility model.

[0020] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0021] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of these terms in this utility model based on the specific content of the technical solution. In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. In the description of this specification, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0022] Reference Figures 1 to 6 A door handle includes: a handle unit including a first handle 100 and a second handle 110, wherein the first handle 100 is installed on one side of the door body and the second handle 110 is installed on the other side of the door body; The lock body unit includes a first push rod 140 and a square bar 130. One end of the first push rod 140 abuts against the first handle 100, and the other end abuts against the second handle 110. The square bar 130 is sleeved on the outside of the first push rod 140. When the lock body unit is in the locked state, the square bar 130 is separated from the second handle 110 to prevent the second handle 110 from driving the square bar 130 to rotate; when the lock body unit is in the unlocked state, the square bar 130 is connected to the second handle 110, so that the second handle 110 drives the square bar 130 to rotate when it rotates.

[0023] By positioning the first push rod 140 between the first handle 100 and the second handle 110, and sleeved the square bar 130 around the first push rod 140, controllable switching of the transmission relationship between the second handle 110 and the square bar 130 is achieved. When the lock body unit is locked, the square bar 130 is separated from the second handle 110. Even if the user rotates the second handle 110, it will only rotate freely and cannot form an effective transmission connection with the square bar 130, thus preventing the bar from rotating. This completely cuts off any possible path for controlling the lock body from the outside of the door, effectively preventing unauthorized opening or technical unlocking, and significantly improving the anti-theft and security performance of the door lock system. In the unlocked state, the square bar 130 establishes a reliable transmission connection with the second handle 110, allowing the second handle 110 to directly drive the square bar 130 to rotate synchronously, thereby normally driving the bolt to complete the opening action, ensuring convenience in daily use and reliability of operational response. This structure is based entirely on the principle of mechanical linkage, requiring no electronic control or complex components, and has the advantages of simple structure, precise action, high stability, and strong durability.

[0024] The door handles include a first handle 100 (usually the indoor side) and a second handle 110 (usually the outdoor side) installed on both sides of the door. The core transmission components of the lock unit include a first push rod 140 and a square bar 130, with the square bar 130 sleeved on the outside of the first push rod 140, and the two arranged coaxially. The two ends of the first push rod 140 respectively abut against the first handle 100 and the second handle 110, forming an axial force transmission path. When the lock unit is in the locked state, there is no mechanical connection (i.e., separation) between the square bar 130 and the second handle 110. At this time, if the user turns the second handle 110 from the outside of the door, since the square bar 130 does not form a transmission engagement with the second handle 110, the second handle 110 can only rotate freely and cannot drive the square bar 130 to rotate. Therefore, it cannot drive the bolt to move, and the door cannot be opened. This design effectively prevents the possibility of unauthorized external operation. When the lock body unit switches to the unlocked state, the internal mechanism (such as the axial movement of the push rod) causes the square bar 130 to establish a transmission connection with the second handle 110 (e.g., through insertion, engagement, or abutment). At this time, rotating the second handle 110 will directly drive the square bar 130 to rotate synchronously, thereby driving the bolt in the lock body to retract and realize the normal door opening function.

[0025] The lock body unit also includes a second push rod 120. The first handle 100 has a first unlocking hole. The second push rod 120 is movably installed in the first unlocking hole and is positioned toward the first push rod 140. When the second push rod 120 pushes the first push rod 140 to move axially toward the second handle 110, the lock body unit switches to the unlocked state. When the second push rod 120 moves away from the first push rod 140, the lock body unit switches to the locked state.

[0026] A second push rod 120 is added to the original lock body unit. This push rod is movably installed in the first unlocking hole on the first handle 100 (usually the indoor handle) and is positioned towards the first push rod 140. The second push rod 120 and the first push rod 140 are axially aligned, forming a triggerable pushing mechanism. When the user applies the second push rod, the second push rod 120 moves axially toward the first push rod 140, pushing the first push rod 140 axially toward the second handle 110. This axial displacement triggers the operation of the internal mechanism of the lock body (such as the connection structure between the square bar 130 and the second handle 110), establishing a transmission connection between the square bar 130 and the second handle 110, thereby switching the lock body unit to the unlocked state. When the operation on the second push rod 120 is released (i.e., the second push rod 120 is pulled out), the second push rod 120 moves away from the first push rod 140 under the action of the reset mechanism (such as the first reset spring 150) or by its own gravity / structural constraint. The first push rod 140 then retracts, causing the transmission connection between the square bar 130 and the second handle 110 to be disconnected. The lock body unit automatically returns to the locked state, realizing the protection of the outer handle from free rotation.

[0027] Users can quickly switch the door lock to the unlocked state by operating the second push rod 120 through the first unlocking hole on the indoor side, facilitating daily entry and exit, especially suitable for scenarios requiring temporary authorization to open the door (such as homes and hotels). The second push rod 120 is directly integrated into the first handle 100 and operated through the unlocking hole on the first handle 100 itself, eliminating the need for additional exposed mechanisms, maintaining a clean appearance, and making it easy for users to identify and use. The push rod push method achieves state switching, with a short action path and clear force application, avoiding the problems of wear and jamming caused by complex gear or linkage mechanisms, thus improving long-term stability and durability.

[0028] The first handle 100 also contains a bearing 160. A second push rod 120 passes through the central hole of the bearing 160. A limit block 170 is provided at the end of the second push rod 120 to prevent it from dislodging from the first unlocking hole. The bearing 160 has a central hole structure, providing precise axial guidance for the second push rod 120, ensuring smooth and unbiased movement when pushing the first push rod 140, and preventing jamming or wear. The limit block 170 is located at the end of the second push rod 120. When the second push rod 120 moves away from the first push rod 140 to its limit position, the limit block 170 is blocked by the body of the first handle 100 or the end face of the bearing 160, thereby preventing the second push rod 120 from completely dislodging from the first unlocking hole, ensuring component integrity and long-term reliability.

[0029] The bearing 160 provides stable guidance for the second push rod 120, significantly reducing frictional resistance and wobbling during movement, making unlocking / locking operations easier and smoother, and improving the user experience. The limit block 170 cooperates with the bearing 160 / first handle 100 to form a mechanical stop, fundamentally preventing the second push rod 120 from accidentally coming off during use or assembly, improving product durability and safety.

[0030] The lock body unit also includes a first return spring 150, which is sleeved on the outside of the first push rod 140 and is used to provide circumferential return torque to the first handle 100.

[0031] The lock body unit also includes an inner steel head 210, which is installed inside the first handle 100. The first return spring 150 is installed inside the inner steel head 210. The first push rod 140 and the square bar 130 are both housed inside the inner steel head 210. When the first handle 100 rotates, it drives the inner steel head 210 to rotate synchronously, thereby driving the square bar 130 to rotate through the inner steel head 210.

[0032] When the user operates the first handle 100 (e.g., by rotating or pressing down), the first handle 100 drives the inner steel head 210, which is fixedly connected to it, to rotate synchronously. Since the square bar 130 is located inside the inner steel head 210 and forms a transmission engagement with it in the circumferential direction (e.g., through a keyway, protrusion, or friction connection), the rotational motion of the inner steel head 210 can be directly transmitted to the square bar 130, thereby driving the bolt action within the lock body to achieve the door opening function. During handle operation, the rotation of the inner steel head 210 synchronously twists the first return spring 150 located inside it. When the user releases the handle, the first return spring 150 releases its elastic potential energy, generating a circumferential return torque, which, through the inner steel head 210, drives the first handle 100 back to its initial position, completing the automatic reset. The first push rod 140, as the core component of axial transmission and clutch control, runs through the entire inner steel head 210 cavity, supporting the return spring and participating in the locking / unlocking state switching; while the inner steel head 210, as the carrier of rotary transmission and spring installation, efficiently and stably transforms the external operation of the handle into the internal locking action.

[0033] By integrating the first return spring 150, the first push rod 140, and the square bar 130 all within the inner steel head 210, the rotational transmission and reset functions are completed collaboratively within the same compact space. This results in a highly integrated structure, a short transmission path, and high efficiency. The inner steel head 210 possesses high rigidity and strength, enabling stable torque transmission and preventing deformation of plastic or thin-walled components during long-term use. Combined with the return spring, it ensures precise return of the handle after each operation, providing a smooth feel and consistent response. All critical moving parts are constrained within the inner cavity of the inner steel head 210, effectively preventing displacement, loosening, or the intrusion of external dust. The metal inner steel head 210 can also withstand repeated torsion and impact, significantly extending the door handle's lifespan.

[0034] The inner steel head 210 has a guide slope 220 at its end and a limiting groove 230 in the circumferential direction. The outer side wall of the square bar 130 has a guide block 240 corresponding to the guide slope 220. In the locked state, the guide block 240 is fitted into the limiting groove 230. When the inner steel head 210 rotates, the guide slope 220 pushes the guide block 240, causing the square bar 130 to move axially, thereby causing the guide block 240 to disengage from the limiting groove 230 and achieve automatic unlocking.

[0035] When the user operates the first handle 100 (usually on the indoor side), the first handle 100 drives the inner steel head 210 to rotate synchronously. At this time, the guide slope 220 at the end of the inner steel head 210 contacts the guide block 240 on the square bar 130 and applies an axial component force along the slope, pushing the square bar 130 to move axially. As the square bar 130 moves axially, the guide block 240 on it gradually disengages from the limiting groove 230, releasing the circumferential locking state. Once the guide block 240 is completely disengaged from the limiting groove 230, the square bar 130 can rotate freely with the inner steel head 210, and at the same time establish a transmission connection with the second handle 110 (such as through a structure like the square sleeve 190), the door lock enters the unlocked state, realizing the linkage between the inner and outer handles to open the door. This mechanism utilizes the slope principle of converting rotational motion into axial displacement, requiring no additional operating parts or electronic control. Only one rotation of the first handle 100 is needed to simultaneously complete the clutch switching and lock body drive, realizing the integrated function of "operation equals unlocking".

[0036] Users only need to rotate the indoor handle normally to automatically unlock it through the interaction of the guide ramp 220 and the guide block 240, eliminating the need for additional pressing, keys, or other operations, greatly improving ease of use. When not in use, the guide block 240 is stably engaged in the limiting groove 230, effectively preventing accidental rotation of the square bar 130 and ensuring that the outer handle is always in a free-spinning state, eliminating the risk of unauthorized opening from the outside. The ramp-slider mechanism converts circumferential rotation into axial displacement, with clear mechanical logic, rapid response, and high repeatability, avoiding the jamming, misalignment, or failure problems common in traditional clutch mechanisms.

[0037] The handle unit also includes a square sleeve 190, which is movably disposed inside the second handle 110 and is connected to the second handle 110 in a transmission manner. The square sleeve 190 is provided with a square hole that is compatible with the square bar 130. When the square bar 130 is inserted into the square hole, the second handle 110 is rotatably connected to the square bar 130 through the square sleeve 190.

[0038] A square sleeve 190 is added to the handle unit. This square sleeve 190 is movably disposed inside the second handle 110 (usually the outer door handle) and forms a transmission connection with the second handle 110 in the circumferential direction (e.g., through a groove, key, or interference fit), ensuring that the second handle 110 can drive the square sleeve 190 to rotate synchronously when it rotates. The square sleeve 190 has a square hole at its center that matches the shape of the square bar 130. When the square bar 130 is inserted into this square hole, the two form a rigid connection in the circumferential direction, thereby achieving torque transmission. When the lock body unit is in the unlocked state, the square bar 130 is inserted into the square hole of the square sleeve 190 under axial drive (e.g., pushed by the first push rod 140). At this time, if the user rotates the second handle 110, its rotational motion is transmitted through the path from the second handle 110 to the square sleeve 190 to the square bar 130, ultimately driving the bolt in the lock body to move, thus opening the door from the outside. In the locked state, the square bar 130 retracts axially and disengages from the square hole of the square sleeve 190, with no mechanical connection between them. At this time, even if the second handle 110 is rotated, its torque is only transmitted to the square sleeve 190 and cannot be transmitted to the square bar 130. Therefore, the square bar 130 remains stationary, the locking tongue does not move, and the outer handle is protected from "free-spinning".

[0039] By using the square sleeve 190 as an intermediate transmission component, the connection state between the second handle 110 and the square bar 130 can be dynamically switched according to the lock body state. This ensures reliable transmission during unlocking and complete isolation during locking, improving both security and functionality. The square sleeve 190 and the square bar 130 use a standard square hole-square bar 130 fit, with no circumferential slippage. This ensures direct and efficient torque transmission, avoiding energy loss or wear problems caused by complex structures such as gears and friction plates.

[0040] The second handle 110 is provided with a second unlocking hole 200, which corresponds to the square sleeve 190. The second handle 110 (usually the outer handle of the door) has a second unlocking hole 200, which is positioned to correspond to the inner square sleeve 190, so that external tools (such as keys, thin rods, special unlocking needles, etc.) can directly act on the square sleeve 190 through the hole.

[0041] In special circumstances (such as inability to operate from the inside, electronic system malfunction, or the user being locked out), the user can insert an unlocking tool into the second unlocking hole 200 and push or move the square sleeve 190 axially, causing it to actively engage with the square bar 130 (even if the lock body was originally locked). Once the square sleeve 190 and the square bar 130 form a transmission connection, rotating the second handle 110 will rotate the square bar 130, thereby driving the bolt to retract and enabling emergency unlocking. In normal use, the second unlocking hole 200 is usually equipped with a dust cover or a concealed design, which does not affect the appearance of the door handle or daily operation; it is only used when needed, ensuring both safety and aesthetics.

[0042] By directly engaging the square sleeve 190 through the second unlocking hole 200, a mechanical emergency unlocking method can be achieved from the outside without damaging the door or lock. This is suitable for various emergency scenarios such as forgetting the key or sudden indoor situations (e.g., an elderly person fainting). No additional complex unlocking mechanism is required; the function is achieved simply by aligning the hole with the square sleeve 190. The operation logic is clear, the response is rapid, and the tool requirements are minimal, such as a common thin rod or the matching key. It retains the anti-theft feature of the outer handle spinning freely in the locked state while providing a legal and controllable emergency opening method when necessary.

[0043] The lock body unit also includes a second return spring 180, which is disposed inside the second handle 110 and is used to drive the square sleeve 190 to move axially away from the square bar 130. The second return spring 180 is added to the lock body unit. The spring is installed inside the second handle 110, usually located at the rear end of the square sleeve 190 (i.e., the side away from the square bar 130). One end of the spring abuts against the square sleeve 190, and the other end abuts against the inner wall or limiting structure of the second handle 110.

[0044] In the locked state or without external intervention, the second return spring 180 is in a naturally extended or pre-compressed state, continuously applying axial thrust to the square sleeve 190, keeping it in a position away from the square bar 130. At this time, the square hole of the square sleeve 190 is separated from the square bar 130, and there is no transmission connection between the two, ensuring that the second handle 110 only rotates freely and cannot drive the lock body. When the lock body unit switches to the unlocked state (for example, the square bar 130 is pushed axially out by the first push rod 140), the square bar 130 is inserted forward into the square hole of the square sleeve 190. This process overcomes the elastic force of the second return spring 180, causing the square sleeve 190 to move backward briefly or remain stationary. Once unlocking is complete, the square bar 130 and the square sleeve 190 form a stable engagement, realizing transmission. If the square sleeve 190 is manually pushed to engage with the square bar 130 through the second unlocking hole 200 to achieve emergency door opening, after the operation is completed, the second reset spring 180 will automatically push the square sleeve 190 back to its original position, so that it is disengaged from the square bar 130 and re-enters the locked isolation state, restoring safety protection without manual intervention.

[0045] The second return spring 180 constantly drives the square sleeve 190 away from the square bar 130, structurally ensuring reliable isolation between the outer handle and the lock body in the unlocked state, effectively preventing accidental triggering or illegal linkage, and improving anti-theft security. After an emergency operation through the second unlocking hole 200, the spring can automatically reset the square sleeve 190, allowing the door lock to immediately return to the locked state, preventing the door from being in an open state for a long time due to user negligence, and enhancing safety. The spring provides a constant axial preload, which can eliminate the wobbling or gap of the square sleeve 190 within the second handle 110, ensuring accurate positioning and smooth operation during transmission or separation, reducing abnormal noise and wear.

[0046] The end of the first push rod 140 facing the square sleeve 190 is formed as a cylindrical surface. The cylindrical surface abuts against the square sleeve 190, so that the first push rod 140 will not drive the square sleeve 190 to move axially when rotating.

[0047] When the first handle 100 is operated and drives the first push rod 140 to rotate (e.g., during reset or transmission), because the contact surface is a cylindrical surface, its surface is continuous, smooth, and without directional protrusions in the circumferential direction, thus no axial component force is generated. Even if the first push rod 140 rotates, only pure rolling or sliding friction occurs between its cylindrical end face and the square sleeve 190, which cannot convert the rotational motion into an axial thrust on the square sleeve 190. This ensures that the rotation of the first push rod 140 will not accidentally trigger the axial movement of the square sleeve 190; the axial position of the square sleeve 190 is only pushed by the unlocking mechanism square bar 130 or controlled by the second reset spring 180, avoiding accidental unlocking due to routine operations such as handle reset.

[0048] This design effectively prevents the first push rod 140 from accidentally pushing the square sleeve 190 due to routine operations such as resetting, shaking, or slight rotation of the first handle 100, thus preventing the lock body from unlocking unexpectedly and significantly enhancing system reliability and anti-theft performance. The cylindrical surface design cleverly separates the rotation function (for transmission or reset) and axial pushing function (for unlocking) of the first push rod 140, ensuring that the two actions do not interfere with each other, resulting in clear logic and precise control.

[0049] This embodiment provides a door handle with mechanical clutch and emergency unlocking functions, which is suitable for entrance doors of residences, hotels or office buildings with high requirements for security and ease of operation.

[0050] The door handle includes a handle unit and a lock body unit. The handle unit includes a first handle 100 installed on the interior side of the door and a second handle 110 installed on the exterior side of the door. The lock body unit mainly includes a first push rod 140, a square bar 130, a first return spring 150, a second return spring 180, an inner steel head 210, a second push rod 120, and a square sleeve 190.

[0051] The first push rod 140 extends through the thickness of the door body, with one end abutting against the first handle 100 and the other end abutting against the square sleeve 190 inside the second handle 110. A square bar 130 is coaxially sleeved outside the first push rod 140, allowing for relative axial sliding but circumferential linkage. An inner steel head 210 is fixedly installed inside the first handle 100, forming a receiving cavity for mounting the first push rod 140, the square bar 130, and the first return spring 150. The first return spring 150 is sleeved outside the first push rod 140 and located inside the inner steel head 210. One end of the spring is connected to the inner steel head 210, and the other end acts on a fixing structure on the first handle 100 or the inner steel head 210, providing circumferential return torque after the first handle 100 is operated, causing it to automatically return to its original position.

[0052] The inner steel head 210 has a guide slope 220 at its end facing the outside of the door, and a limiting groove 230 is formed in its circumferential direction. The outer wall of the square bar 130 has a guide block 240 corresponding to the guide slope 220. In the locked state, the guide block 240 is embedded in the limiting groove 230, restricting the square bar 130 from rotating with the inner steel head 210; when the user rotates the first handle 100, the inner steel head 210 rotates synchronously, and the guide slope 220 at its end pushes the guide block 240, causing the square bar 130 to move outward along the axial direction. The guide block 240 then disengages from the limiting groove 230, and the square bar 130 gains the ability to rotate freely, and the door lock switches to the unlocked state.

[0053] The second handle 110 has a movable square sleeve 190 inside, which is circumferentially connected to the second handle 110 to ensure that the second handle 110 can drive the square sleeve 190 to rotate synchronously. The square sleeve 190 has a square hole at its center that matches the cross-section of the square bar 130. When the square bar 130 extends axially and is inserted into the square hole, the second handle 110 can drive the square bar 130 to rotate through the square sleeve 190, thus opening the door from the outside. In the locked state, the square bar 130 retracts and separates from the square sleeve 190, and the second handle 110 can only rotate freely and cannot drive the lock body.

[0054] To ensure the reliability of the locked state, the second handle 110 is also equipped with a second return spring 180. One end of the return spring abuts against the square sleeve 190, and the other end abuts against the housing of the second handle 110, continuously applying axial elastic force to keep the square sleeve 190 in a position away from the square bar 130. Even if the external force is released after an emergency unlocking operation, the second return spring 180 can automatically push the square sleeve 190 back to its original position, restoring the locked isolation state.

[0055] In addition, the second handle 110 has a second unlocking hole 200, which is directly opposite the inner square sleeve 190. In an emergency, the user can use a special tool or a thin rod to insert through the second unlocking hole 200 and manually push the square sleeve 190 to overcome the elastic force of the second return spring 180, so that it engages with the square bar 130, thereby achieving mechanical emergency unlocking.

[0056] The first handle 100 has a bearing component 160 inside, and the second push rod 120 passes through the central hole of the bearing component 160 and is positioned towards the first push rod 140. The first handle 100 has a first unlocking hole for the user to operate the second push rod 120. The end of the second push rod 120 has a limiting block 170 to prevent it from disengaging from the first unlocking hole. When the user presses or rotates the second push rod 120 from the indoor side, it pushes the first push rod 140 axially towards the second handle 110, thereby moving the square bar 130 forward to complete the unlocking; after release, the relevant spring mechanism automatically resets the system to the locked state.

[0057] Specifically, the end of the first push rod 140 facing the square sleeve 190 is machined into a smooth cylindrical surface. This design ensures that when the first push rod 140 rotates with the first handle 100 (such as during reset), its end only makes sliding or rolling contact with the square sleeve 190, without generating an axial force. This avoids unintended unlocking caused by accidentally pushing the square sleeve 190 during rotation, and effectively decouples the rotational and axial drive functions.

[0058] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A door handle, characterized in that, include: The handle unit includes a first handle and a second handle, wherein the first handle is installed on one side of the door and the second handle is installed on the other side of the door; The lock body unit includes a first push rod and a square bar. One end of the first push rod abuts against the first handle, and the other end abuts against the second handle. The square bar is sleeved on the outside of the first push rod. When the lock body unit is in the locked state, the square bar is separated from the second handle to prevent the second handle from driving the square bar to rotate; when the lock body unit is in the unlocked state, the square bar is connected to the second handle, so that the second handle rotates and drives the square bar to rotate.

2. A door handle according to claim 1, characterized in that, The lock body unit further includes a second push rod. The first handle has a first unlocking hole. The second push rod is movably installed in the first unlocking hole and is positioned toward the first push rod. When the second push rod pushes the first push rod to move axially toward the second handle, the lock body unit switches to the unlocked state. When the second push rod moves away from the first push rod, the lock body unit switches to the locked state.

3. A door handle according to claim 2, characterized in that, The first handle also has a bearing component inside, and the second push rod passes through the central hole of the bearing component. A limit block is provided at the end of the second push rod to prevent the second push rod from coming out of the first unlocking hole.

4. A door handle according to claim 1, characterized in that, The lock body unit also includes a first return spring, which is sleeved on the outside of the first push rod and is used to provide circumferential return torque to the first handle.

5. A door handle according to claim 4, characterized in that, The lock body unit also includes an inner steel head, which is installed inside the first handle. The first return spring is installed inside the inner steel head. The first push rod and the square bar are both housed inside the inner steel head. When the first handle rotates, it drives the inner steel head to rotate synchronously, thereby driving the square bar to rotate through the inner steel head.

6. A door handle according to claim 5, characterized in that, The end of the inner steel head is provided with a guide slope and a limit groove is formed in the circumferential direction. The outer side wall of the square bar is provided with a guide block corresponding to the guide slope. In the locked state, the guide block is fitted into the limit groove. When the inner steel head rotates, the guide slope pushes the guide block, causing the square bar to move axially, thereby causing the guide block to disengage from the limit groove and achieve automatic unlocking.

7. A door handle according to claim 1, characterized in that, The handle unit also includes a square sleeve, which is movably disposed inside the second handle and is connected to the second handle in a transmission manner. The square sleeve is provided with a square hole that is adapted to the square bar. When the square bar is inserted into the square hole, the second handle is rotatably connected to the square bar through the square sleeve.

8. A door handle according to claim 7, characterized in that, The second handle is provided with a second unlocking hole, which corresponds to the square sleeve.

9. A door handle according to claim 7 or 8, characterized in that, The lock body unit also includes a second return spring, which is disposed inside the second handle and is used to drive the square sleeve to move axially away from the square bar.

10. A door handle according to claim 7, characterized in that, The end of the first push rod facing the square sleeve is formed as a cylindrical surface, which abuts against the square sleeve, so that the first push rod will not drive the square sleeve to move axially when it rotates.

Images