A single opening and double opening switchable lock body

Abstract

A single opening and double opening switchable lock body includes a lock tongue, a shell, a linkage plate, an inner cam and an outer cam, the lock tongue is movable relative to the shell under external force to complete the locking and unlocking process; other components can be directly or indirectly installed, positioned or limited in the shell, the inner cam and the outer cam are fixed on the shell in a rotatable manner relative to the shell, the inner cam and the outer cam are provided with a structure that can be driven by a handle or directly fixed together with the handle, so that rotating the inner handle or the outer handle can rotate the corresponding inner cam or outer cam. This design can realize function switching on a mechanical lock, can switch from two-sided handle unlocking to single-sided handle unlocking, can switch from inner handle unlocking to outer handle unlocking, and can be widely used in many fields.

Description

Technical Field

[0001] This invention belongs to the field of locks, specifically relating to a lock body that can be switched between single and double opening. Background Technology

[0002] The unlocking methods of existing mechanical locks are generally fixed, especially for lock bodies that are unlocked by handles. If the lock body is designed with a double-opening structure, it can always be unlocked from both the inside and the outside. If it is a single-opening structure, generally only the handle on the inside can be used to open and unlock the door, while the handle on the outside is usually fixed and cannot be rotated, so it cannot be unlocked or opened.

[0003] Existing electronic locks generally cannot be opened or unlocked in their normal external handle state. Switching to an unlockable state requires converting electrical energy into mechanical energy, which is costly and will also fail in the event of a power outage, meaning that the lock cannot be opened without power, or that using a key to unlock it is inconvenient.

[0004] Many interior doors in rooms don't normally need to be locked, as double-opening doors are convenient. However, when guests come over, or when people inside need privacy, they generally don't want outsiders to enter freely. To prevent children from locking themselves in their rooms and causing accidents, it's best to avoid locks that can only be opened from the inside. In these situations, a lock that can be opened with an external key is needed. Currently, there are virtually no mechanical locks on the market that can achieve these functions. While electronic locks can perform many functions, they are expensive and generally not used on interior doors. Therefore, designing a low-cost, switchable double-opening mechanical lock has a large market potential. Summary of the Invention

[0005] In view of the above-mentioned prior art, the purpose of this invention is to improve and optimize the design of a lock body that can be switched between single and double opening based on mechanical locks or magnetic mechanical locks.

[0006] The technical solution of this invention is implemented as follows: A lock body that can be switched between single and double opening includes a bolt, a housing, a linkage plate, an inner cam, and an outer cam. The bolt can move relative to the housing under external force to complete the locking and unlocking process. Other components can be directly or indirectly installed, positioned, or limited inside the housing. The inner and outer cams are fixed to the housing in a way that allows them to rotate relative to the housing. The inner and outer cams are provided with a structure that can drive the handle or be directly fixed to the handle so that rotating the inner or outer handle can rotate the corresponding inner or outer cam. The linkage plate can move relative to the housing on a specific track. The linkage plate has at least three positions relative to the housing, namely a double-opening position, a single-opening position, and an unlocking position, with the double-opening position located between the single-opening and unlocking positions. When the linkage plate moves from the double-opening position to the unlocking position, a specific position on the linkage plate directly or indirectly contacts or links with the bolt, causing the bolt to retract under the action of the linkage plate to complete the unlocking. The outer contours of the inner and outer cams are all at least... The design incorporates one protruding part, allowing the inner and outer cams to rotate relative to the housing. This protruding part interacts with the first protrusion on the linkage plate in the double-open position, pushing the linkage plate from the double-open position to the unlocked position. When the linkage plate is in the single-open position, the first protrusion on the linkage plate moves relative to the outer and inner cams, altering their distance. This allows the protrusion on the outer cam on the non-unlocking side to rotate to any position without contacting the first protrusion on the linkage plate. However, when the linkage plate is in the single-open position, the inner cam on the unlocking side rotates in the unlocking direction, and its protrusion contacts the second protrusion on the linkage plate, pushing the linkage plate to the double-open position. Further rotation of the inner cam then moves the linkage plate to the unlocked position, indirectly acting on the bolt to unlock it. The inner or outer cam has a reset rod extending outward from the cam's rotation axis, which can follow the cam's rotation, directly or indirectly driving the linkage plate in the opposite direction to the unlocking direction. The handle is directly fixed to the cam, a simple design that allows direct rotation of the cam via the handle, controlling the linkage plate's movement. Moving the linkage plate to the unlocked position unlocks it. In the single-open position, only one cam can unlock, while in the double-open position, both cams can unlock.

[0007] Furthermore, the linkage plate is equipped with a top block that can interact with the bolt, and the bolt has a corresponding position for action. When the linkage plate moves from the single-open position to the double-open position, the top block does not contact the bolt, but when the linkage plate moves from the double-open position to the unlocked position, the top block can push the bolt to unlock. This direct control of the bolt via the linkage plate is simple and low-cost. The movement direction of the linkage plate can be parallel to the movement direction of the bolt, thus achieving simple direct transmission.

[0008] Furthermore, a combined rotating component is rotatably fixed to the housing. This component has a rotating shaft from which an input arm and an output arm extend, with the input arm being shorter than the output arm. During the movement of the linkage plate from the single-open position to the double-open position, the linkage plate and the combined rotating component do not contact each other. During the movement of the linkage plate from the double-open position to the unlocked position, the interaction between the linkage plate and the input arm of the combined rotating component pushes the combined rotating component to rotate, causing the output arm to contact the bolt and unlock the bolt. This design has a lever amplification effect, allowing the bolt to move a larger distance with only a small displacement of the linkage plate.

[0009] Furthermore, the second protruding block on the linkage plate can move relative to the linkage plate in the front-back direction. The inner cam and outer cam are located on the same rotation axis, and the rotation axis is parallel to the straight line in the front-back direction. When the second protruding block moves backward, the inner cam located behind rotates, and the protruding part of the inner cam can contact the second protruding block, pushing the second protruding block to move and indirectly moving the linkage plate. However, the protruding part of the outer cam located in front rotates at any angle without contacting the second protruding block. When the second protruding block moves forward, the inner cam located behind rotates at any angle without contacting the second protruding block. However, the protruding part of the outer cam located in front rotates, and the protruding part of the outer cam can contact the second protruding block, pushing the second protruding block to move and indirectly moving the linkage plate. A positioning structure is provided between the linkage plate and the second protruding block so that when the second protruding block moves relative to the linkage plate to a specific position, it can be ensured that the second protruding block will not move relative to the linkage plate when the external force is less than a certain value. In this way, by moving the second protruding block, the function switching between the inner cam and the outer cam can be realized, that is, the unlocking function of the inner handle and the outer handle. This ensures that one side can be quickly unlocked directly through the handle without any conditions, thus ensuring the escape function in an emergency.

[0010] Furthermore, the bolt can lock under the action of a spring or magnet and unlock using a linkage plate or a combined rotating component. The magnetic structure is relatively simple and practical, while the spring structure requires the bolt to be designed with a bevel to assist in locking.

[0011] Furthermore, the inner and outer cams are designed with an axisymmetric shape, allowing them to be used interchangeably. Both the inner and outer cams are equipped with a reset rod. The reset rod interacts with the elastic structure, causing the inner or outer cam to rotate under external force. This causes the elastic structure to deform, and after the external force is removed, the inner or outer cam rotates back to its initial position. The inner and outer cams are coaxially equipped with a rotating plate. The rotating plate rotates independently of the inner and outer cams without affecting each other. The rotating plate can be driven by the key to rotate, and its rotation drives the linkage plate to move between the single-open, double-open, and unlocked positions. The symmetrical design allows the inner and outer cams to use the same components, reducing production and design costs. The rotating plate enables unlocking with a standard key, thus adapting to different usage scenarios.

[0012] Furthermore, two arc-shaped through holes or arc-shaped sliding grooves are provided on each of the front and rear sides of the housing. The center of the arc of the arc-shaped through hole or arc-shaped sliding groove is located on the rotation axis of the inner cam and the outer cam. The elastic structure includes an arc-shaped shell, a compression spring, and an arc-shaped block. The compression spring and the arc-shaped block can be installed in the arc-shaped shell, and the arc-shaped block can move in the arc-shaped groove in the arc-shaped shell and squeeze the compression spring. The arc-shaped shell and the arc-shaped block are provided with protrusions at the front and rear, which can be installed in the arc-shaped through holes or arc-shaped sliding grooves of the housing, so that the arc-shaped shell and the arc-shaped block can move along the arc of the arc-shaped through hole or arc-shaped sliding groove. The reset rod can be installed between the arc-shaped shell and the arc-shaped block so that when the cam rotates in the locking direction, it can push the arc-shaped shell to move and indirectly push the linkage plate to move in the locking direction, while the arc-shaped block does not move but the compression spring is squeezed. When the cam rotates in the unlocking direction, the arc-shaped shell does not move, the arc-shaped block moves and squeezes the compression spring. This ensures that the handle will return to its initial position under the action of the elastic structure after the external force is removed, regardless of whether it is turned forward or backward. Since it needs to be turned forward and backward, and a structure on one side is needed to push the linkage plate, at least one side of the structure needs to be able to rotate with the cam. Rotation on one side will result in an imbalance of forces. The symmetrical design can make the forces on both sides the same, so the structures on both sides need to slide or rotate to achieve symmetry in force. This provides a good user experience and avoids the phenomenon that it is easy to rotate on one side and difficult to rotate on the other.

[0013] Furthermore, the housing is equipped with a key-driven locking wheel, which has a transmission arm. Clockwise rotation of the locking wheel directly or indirectly drives the linkage plate to move in the unlocking direction via the transmission arm, while counter-clockwise rotation drives the linkage plate directly or indirectly to move in the locking direction. This allows for different keyhole locations to achieve different unlocking methods and enables further integration with various functions, such as expanding into electronic locks.

[0014] Furthermore, the linkage plate is equipped with a return spring. When the linkage plate moves from the double-open position to the unlocked position, the return spring undergoes elastic deformation to store energy. After the external force is removed, the return spring can push the linkage plate from the unlocked position to the double-open position. When the linkage plate moves from the single-open position to the double-open position, the return spring does not deform. This ensures that the bolt can lock and unlock according to specific circumstances without being restricted by the position of the linkage plate when no external force is applied. Under the action of the return spring, the linkage plate will move from the unlocked position to the double-open position when no external force is applied. If the linkage plate needs to limit the bolt, it can be unlocked or locked by turning the handle.

[0015] Furthermore, the linkage plate is equipped with a spring seat, within which a spring is housed, and at both ends of the spring are ball bearings. These ball bearings can be pushed into the spring seat when compressed. The bolt has a deadbolt groove, and the linkage plate has a corresponding deadbolt protrusion. The housing has a deadbolt positioning hole and an unlocking slide groove at corresponding positions. When the linkage plate is in the deadbolt position, the deadbolt protrusion is located within the deadbolt groove, restricting bolt movement, and the ball bearings are located within the deadbolt positioning hole. When the linkage plate moves from the double-open position to the unlocked position, the ball bearings move within the unlocking slide groove. The unlocking slide groove can be designed in a triangular shape, increasing resistance as it slides to one side. This provides both the limiting and positioning function of the spring seat and a certain degree of reset function, and can also achieve a buffering function by increasing resistance.

[0016] The advantages of this design are: it allows for function switching on mechanical locks, enabling switching from unlocking with both handles to unlocking with one handle, and from unlocking with the inner handle to unlocking with the outer handle. Keyholes can be placed on the handle or in other locations. It is compatible with electronic lock designs and can be produced modularly. Different functions can be achieved by assembling or replacing different parts on a single lock body, which is very effective in reducing costs and can be widely used in many fields. Attached Figure Description

[0017] Figure 1 This is an exploded schematic diagram of a lock body that can be switched between single and double opening according to the present invention;

[0018] Figure 2 This is a front view of the assembly of a lock body that can be switched between single and double opening according to the present invention.

[0019] Figure 3 This is a three-dimensional schematic diagram of the single-opening position of a lock body that can switch between single and double opening according to the present invention, without a shell.

[0020] Figure 4 This is a front view of the single-opening position of a lock body with a switchable single-opening and double-opening mechanism according to the present invention;

[0021] Figure 5 This is a three-dimensional schematic diagram of the double-opening position of a lock body that can be switched between single and double opening according to the present invention.

[0022] Figure 6 This is a schematic diagram of the rotation of a cam in the double-opening position of a lock body that can be switched between single and double opening positions according to the present invention.

[0023] Figure 7 This is a schematic diagram of a lock body linkage plate that can switch between single and double opening to directly drive the lock tongue according to the present invention.

[0024] Figure 8 This is an exploded view of the lock body handle with lock head that can be switched between single and double opening according to the present invention. Detailed Implementation

[0025] Detailed embodiments of the invention are disclosed herein as needed; however, it should be understood that the disclosed embodiments are merely illustrative of the invention, and the invention may be implemented in different and alternative forms. The drawings are not necessarily drawn to scale, and certain features may be exaggerated or reduced to show details of specific components. Therefore, the specific structural and functional details disclosed herein should not be construed as limiting, but rather as a representative basis to teach those skilled in the art to employ the invention differently. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of this invention.

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, a lock body that can be switched between single and double opening includes a bolt 3, a housing 2, a linkage plate 1, an inner cam 4, and an outer cam 44. The bolt 3 can move relative to the housing 2 under external force to complete the locking and unlocking process. The housing 2 is made of sheet metal and can directly or indirectly install, position, or limit other components inside the housing 2. The housing 2 can be assembled from an inner housing 21 and an outer housing 22. The inner cam 4 and the outer cam 44 are fixed to the housing 2 in a way that allows them to rotate relative to the housing 2. The inner cam 4 and the outer cam 44 are provided with square holes that can be driven by a handle 6. Through a square inner rod 24 or an outer rod 25, they are directly fixed to the handle 6 so that rotating the inner handle 61... Alternatively, the outer handle 62 can rotate the corresponding inner rod 24 or outer rod 25, which transmits power to the inner cam 4 or outer cam 44. The outer rod 25 has a through hole in the center for the rotating bar 53 to pass through. The handle 6 is fixed to the track groove 18 on the linkage plate 1 of the lock body via the fixing plate 20, and can move relative to the housing 2 on a specific track 27. The linkage plate 1 has at least three positions relative to the housing 2, namely the double-open position, the single-open position, and the unlock position, with the double-open position located between the single-open position and the unlock position. When the linkage plate 1 moves from the double-open position to the unlock position, a specific position on the linkage plate 1 directly or indirectly contacts or is linked with the bolt 3, causing the bolt 3 to retract under the action of the linkage plate 1 to complete the unlocking. The lock has at least one protruding part 41 on the outer contour of both the inner cam 4 and the outer cam 44. When the inner cam 4 and the outer cam 44 rotate relative to the housing 2, the protruding part 41 can interact with the first protruding part 11 on the linkage plate 1 in the double-open position to push the linkage plate 1 from the double-open position to the unlocked position. When the linkage plate 1 is in the single-open position, the first protruding part 11 on the linkage plate 1 moves relative to the outer cam 44 and the inner cam 4, changing the distance between them. This allows the outer cam 44 on the non-unlocking side to rotate to any position without the protruding part 41 on the outer cam 44 contacting the first protruding part 11 on the linkage plate 1, but the linkage plate 1 is in the single-open position. When the inner cam 4 on the unlocking side rotates in the unlocking direction, the protruding part 41 on the inner cam 4 contacts the second protruding block 12 on the linkage plate 1, which can push the linkage plate 1 to the double-open position. That is, the gap between the inner cam 4 and the outer cam 44 can accommodate the second protruding block 12, so that the second protruding block 12 cannot contact both the inner cam 4 and the outer cam 44 at the same time. At this time, further rotation of the inner cam 4 can move the linkage plate 1 to the unlocking position and indirectly act on the lock tongue 3 to unlock the lock tongue 3. The inner cam 4 or the outer cam 44 is provided with a reset rod 42. The reset rod 42 can follow the rotation of the cam and directly or indirectly drive the linkage plate 1 to move in the opposite direction to the unlocking direction.

[0027] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, a combined rotating component 7 is rotatably fixed on the housing 2. The combined rotating component 7 has a rotating shaft 71 and an input arm 72 and an output arm 73 extending from the rotating shaft 71. The length of the input arm 72 is less than the length of the output arm 73. During the process of the linkage plate 1 moving from the single-open position to the double-open position, the linkage plate 1 and the combined rotating component 7 do not come into contact. During the process of the linkage plate 1 moving from the double-open position to the unlocked position, the unlocking protrusion 74 of the linkage plate 1 interacts with the input arm 72 of the combined rotating component 7 to push the combined rotating component 7 to rotate, so that the output arm 73 contacts the locking tongue 3 and pushes the locking tongue 3 to unlock.

[0028] like Figure 1 , Figure 2 , Figure 3 and Figure 4 Figure 8 As shown, the second protruding block 12 on the linkage plate 1 can move relative to the linkage plate 1 in the front-back direction. The linkage plate 1 is provided with a first positioning point 15 and a second positioning point 16. The second protruding block 12 is provided with spring holes 13 at both the top and bottom, and springs are provided in the spring holes. The springs are provided with balls 14 that match the first positioning point 15 and the second positioning point 16. The inner cam 4 and the outer cam 44 are located on the same rotation axis 71, and the rotation axis 71 is parallel to the straight line in the front-back direction. When the second protruding block 12 moves backward, the inner cam 4 located behind it rotates, and the protruding part 41 of the inner cam 4 can contact the second protruding block 12 to push the second protruding block 12 to move, indirectly moving the linkage. The outer cam 44, located in front, rotates at any angle, but the protruding part 41 does not contact the second protruding block 12. When the second protruding block 12 moves forward, the inner cam 4, located behind, rotates at any angle, but the protruding part 41 does not contact the second protruding block 12. However, when the outer cam 44, located in front, rotates, the protruding part 41 of the outer cam 44 can contact the second protruding block 12, pushing the second protruding block 12 to move and indirectly moving the linkage plate 1. A positioning structure is provided between the linkage plate 1 and the second protruding block 12 so that when the second protruding block 12 moves relative to the linkage plate 1 to a specific position, it can be ensured that the second protruding block 12 does not move relative to the linkage plate 1 when the external force is less than a certain value.

[0029] like Figure 5 As shown, the latch 3 has a round hole 31 to fix the spring.

[0030] like Figure 2 As shown, a magnet can be installed inside the lock box 32. The lock tongue 3 locks under magnetic force and unlocks by means of the linkage plate 1 or the combined rotating part 7. The arc extension of the cam 4 in the single-opening position does not contact or interfere with the first protrusion 11, which ensures that the rotation of the cam 4 does not contact the first protrusion 11.

[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the inner cam 4 and the outer cam 44 are designed with an axisymmetric shape, making them interchangeable. Both the inner cam 4 and the outer cam 44 are equipped with a reset rod 42. The reset rod 42 interacts with the elastic structure, causing the inner cam 4 or the outer cam 44 to rotate under external force, which causes the elastic structure 8 to deform. After the external force is removed, the inner cam 4 or the outer cam 44 rotates to its initial position. The inner cam 4 and the outer cam 44 are coaxially equipped with a rotating plate 5. The rotating plate 5 rotates independently of the inner cam 4 and the outer cam 44 without affecting each other. The rotating plate 5 has a square hole 51 in the middle position, which can be driven by a key to rotate. The handle 6 has a lock hole 68, in which a lock head 52 can be installed. The key can drive the lock head 52, which drives the rotating bar 53. The rotating bar 53 then drives the rotating plate 5 to achieve transmission. The rotating plate 5 has a partial gear 54 on one side that matches the rack 46 on the second protruding block 12, so that the rotation of the rotating plate 5 can drive the linkage plate 1 to move between the single-open position, the double-open position, and the unlocked position.

[0032] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the housing 2 has two arc-shaped through holes 23 on each of its front and rear sides. The center of the arc of the arc-shaped through hole 23 is located on the pivot 45 of the inner cam 4 and the outer cam 44. The elastic structure 8 includes an arc-shaped shell 81, a compression spring 83, and an arc-shaped block 82. The compression spring 83 and the arc-shaped block 82 can be installed inside the arc-shaped shell 81, and the arc-shaped block 82 can move in the arc-shaped groove 84 inside the arc-shaped shell 81 and compress the compression spring 83. The arc-shaped shell 81 and the arc-shaped block 82 are provided with protrusions at the front and rear, which can be installed into the arc-shaped through holes 23 of the housing 2. This allows the arc-shaped shell 81 and the arc-shaped block 82 to move along the arc of the arc-shaped through hole 23. The reset rod 42 can be installed between the arc-shaped shell 81 and the arc-shaped block 82 so that when the cam 4 rotates in the locking direction, it can push the arc-shaped shell 81 to move and indirectly push the linkage plate 1 to move in the locking direction by relying on the protrusion 88 and the large top position 87 of the second protrusion 12. The arc-shaped block 82 does not move, but the compression spring 83 is squeezed. When the cam 4 rotates in the unlocking direction, the arc-shaped shell 81 does not move, the arc-shaped block 82 moves and squeezes the compression spring 83.

[0033] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the linkage plate 1 is provided with a reset spring so that when the linkage plate 1 moves from the double-open position to the unlock position, the reset spring 19 will undergo elastic deformation to store energy. After the external force is removed, the reset spring 19 can push the linkage plate 1 from the unlock position to the double-open position. When the linkage plate 1 moves from the single-open position to the double-open position, the reset spring 19 will not deform.

[0034] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the linkage plate 1 is provided with a spring seat 10, and a spring is provided inside the spring seat 10. The spring has two balls 14 at both ends, so that the balls 14 can move into the spring seat 10 when squeezed. The lock tongue 3 is provided with a deadbolt groove 33. The linkage plate 1 is provided with a deadbolt protrusion 34 at the corresponding position. The housing 2 is provided with a deadbolt positioning hole 26 and an unlocking slide groove 28 at the corresponding position. When the linkage plate 1 is in the deadbolt position, the deadbolt protrusion 34 is located in the deadbolt groove 33 to restrict the movement of the lock tongue 3, and the balls 14 are located in the deadbolt positioning hole 26. When the linkage plate 1 moves from the double-open position to the unlocked position, the balls 14 are located in the unlocking slide groove 28 and move.

[0035] like Figure 7 As shown, the linkage plate 1 is provided with a top block 39 that can work with the locking tongue 3, and the locking tongue 3 is provided with a corresponding protrusion 38. When the linkage plate 1 moves from the single-open position to the double-open position, the top block does not contact the locking tongue 3. However, when the linkage plate 1 moves from the double-open position to the unlock position, the inclined surface 37 of the top block can push the locking tongue 3 to unlock.

[0036] like Figure 5 , Figure 6 As shown, the housing 2 is provided with a lock wheel 59 that can be driven by a key. The lock wheel 59 is provided with a transmission arm 58. When the lock wheel 59 rotates clockwise, it can directly drive the corresponding position 57 of the linkage plate 1 to move in the unlocking direction through the transmission arm 58. When the lock wheel 59 rotates counterclockwise, it can indirectly drive the linkage plate 1 to move in the locking direction by driving the paddle 56 through the transmission arm 58.

Claims

1. A lock body that can be switched between single and double opening modes, comprising a bolt, a housing, a linkage plate, an inner cam, and an outer cam, wherein the bolt can move relative to the housing under external force to complete the locking and unlocking process; other components can be directly or indirectly installed, positioned, or limited within the housing, characterized in that: The inner and outer cams are fixed to the housing in a rotatable manner relative to the housing. The inner and outer cams have a structure that allows them to drive the handle or are directly fixed to the handle, so that rotating the inner or outer handle rotates the corresponding inner or outer cam. The linkage plate can move relative to the housing on a specific track. The linkage plate has at least three positions relative to the housing: a double-open position, a single-open position, and an unlocked position, with the double-open position located between the single-open and unlocked positions. When the linkage plate moves from the double-open position to the unlocked position, a specific position on the linkage plate directly or indirectly contacts or links with the bolt, causing the bolt to retract under the action of the linkage plate to complete unlocking. Each of the inner and outer cams has at least one protruding part on its outer contour, so that when the inner and outer cams rotate relative to the housing, the protruding part can engage with the linkage plate in the double-open position. The first protrusion pushes the linkage plate from the double-open position to the unlocked position. When the linkage plate is in the single-open position, the first protrusion on the linkage plate moves relative to the outer and inner cams, changing the distance between them. This allows the outer cam on the non-unlocking side to rotate to any position, and the protrusion on the outer cam does not contact the first protrusion on the linkage plate. However, when the linkage plate is in the single-open position, when the inner cam on the unlocking side rotates in the unlocking direction, the protrusion on the inner cam contacts the second protrusion on the linkage plate, which can push the linkage plate to the double-open position. At this time, further rotation of the inner cam can move the linkage plate to the unlocked position and indirectly act on the lock tongue to unlock it. The inner and outer cams are provided with a reset rod, which extends outward from the rotation axis of the cam. The reset rod can follow the rotation of the cam to directly or indirectly drive the linkage plate to move in the opposite direction to the unlocking direction.

2. The lock body that can be switched between single and double opening as described in claim 1, characterized in that: The linkage plate is provided with a top block that can interact with the locking tongue, and the locking tongue is provided with a corresponding position. When the linkage plate moves from the single-open position to the double-open position, the top block does not contact the locking tongue. However, when the linkage plate moves from the double-open position to the unlock position, the top block can push the locking tongue to unlock.

3. The lock body that can be switched between single and double opening as described in claim 1, characterized in that: A combined rotating component is rotatably fixed on the housing. The combined rotating component has a rotating shaft from which an input arm and an output arm extend. The length of the input arm is shorter than the length of the output arm. During the process of the linkage plate moving from the single-open position to the double-open position, the linkage plate and the combined rotating component do not come into contact. During the process of the linkage plate moving from the double-open position to the unlocked position, the linkage plate and the input arm of the combined rotating component interact to push the combined rotating component to rotate, so that the output arm contacts the lock tongue and pushes the lock tongue to unlock.

4. The single-opening / double-opening switchable lock body according to claim 1, 2, or 3, characterized in that: The second protruding block on the linkage plate can move relative to the linkage plate in the front-back direction. The inner cam and the outer cam are located on the same axis of rotation, and the axis of rotation is parallel to the straight line in the front-back direction. When the second protruding block moves backward, the inner cam located behind rotates, and the protruding part of the inner cam can contact the second protruding block, pushing the second protruding block to move and indirectly moving the linkage plate. However, the protruding part of the outer cam located in front rotates at any angle and does not contact the second protruding block. When the second protruding block moves forward, the inner cam located behind rotates at any angle and the protruding part does not contact the second protruding block. However, when the outer cam located in front rotates, the protruding part of the outer cam can contact the second protruding block, pushing the second protruding block to move and indirectly moving the linkage plate. A positioning structure is provided between the linkage plate and the second protruding block, so that when the second protruding block moves relative to the linkage plate to a specific position, it can be ensured that the second protruding block does not move relative to the linkage plate when the external force is less than a certain value.

5. The lock body that can be switched between single and double opening as described in claim 4, characterized in that: The locking tongue can be locked by spring or magnetic force and unlocked by linkage plate or joint rotating component.

6. The lock body that can be switched between single and double opening as described in claim 5, characterized in that: The inner and outer cams are designed with an axisymmetric shape, making them interchangeable. The reset rod interacts with the elastic structure, causing the inner or outer cam to rotate under external force, which in turn deforms the elastic structure. After the external force is removed, the inner or outer cam rotates back to its initial position. The inner and outer cams are coaxially equipped with a rotating plate, which rotates independently of the inner and outer cams without affecting each other. The rotating plate can be driven by a key to rotate, and its rotation can drive the linkage plate to move between the single-open position, the double-open position, and the unlocked position.

7. The lock body that can be switched between single and double opening as described in claim 6, characterized in that: The housing has two arc-shaped through holes or arc-shaped grooves on each of its front and rear sides. The center of the arc of the arc-shaped through hole or arc-shaped groove is located on the rotation axis of the inner cam and the outer cam. The elastic structure includes an arc-shaped shell, a compression spring, and an arc-shaped block. The compression spring and the arc-shaped block can be installed inside the arc-shaped shell, and the arc-shaped block can move in the arc-shaped groove inside the arc-shaped shell and compress the compression spring. The arc-shaped shell and the arc-shaped block have protrusions at both the front and rear. The protrusions can be installed in the arc-shaped through holes or arc-shaped grooves of the housing, so that the arc-shaped shell and the arc-shaped block can move along the arc of the arc-shaped through hole or arc-shaped groove. The reset rod can be installed between the arc-shaped shell and the arc-shaped block, so that when the cam rotates in the locking direction, it can push the arc-shaped shell to move and indirectly push the linkage plate to move in the locking direction, and the arc-shaped block does not move but the compression spring is compressed. When the cam rotates in the unlocking direction, the arc-shaped shell does not move, and the arc-shaped block moves and compresses the compression spring.

8. The lock body that can be switched between single and double opening as described in claim 3, characterized in that: The housing is equipped with a lock wheel that can be driven by a key. The lock wheel is equipped with a transmission arm. When the lock wheel rotates clockwise, it can directly or indirectly drive the linkage plate to move in the unlocking direction through the transmission arm. When the lock wheel rotates counterclockwise, it can directly or indirectly drive the linkage plate to move in the locking direction through the transmission arm.

9. The lock body that can be switched between single and double opening according to claim 1, 7, or 8, characterized in that: The linkage plate is equipped with a reset spring, which causes the reset spring to elastically deform and store energy when the linkage plate moves from the double-open position to the unlocked position. After the external force is removed, the reset spring can push the linkage plate from the unlocked position to the double-open position. The reset spring does not deform when the linkage plate moves from the single-open position to the double-open position.

10. The lock body that can be switched between single and double opening as described in claim 9, characterized in that: The linkage plate is provided with a spring seat, and a spring is provided inside the spring seat with ball bearings at both ends of the spring so that the ball bearings can move inward when squeezed. The lock tongue is provided with a deadbolt groove, and the linkage plate is provided with a deadbolt protrusion. The housing is provided with a deadbolt positioning hole and an unlocking slide groove. When the linkage plate is in the deadbolt position, the deadbolt protrusion is located in the deadbolt groove to restrict the movement of the lock tongue, and the ball bearings are located in the deadbolt positioning hole. When the linkage plate moves from the double-open position to the unlocked position, the ball bearings move in the unlocking slide groove.

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