Lock and telescopic protective door fence with same

Abstract

When a connector is unlocked, a knob needs to be pressed firstly to overcome elastic force applied by a first top spring to enable the knob and a shell to be separated from a clamping state, then the knob is twisted to unlock the connector through matching with a locking structure, and the connector is locked. The knob is forced to ascend to be clamped with the shell through elastic force applied by the first jacking spring, so that the connector is kept in an unlocking state, when the connector needs to be locked, the knob is pressed to overcome the elastic force applied by the first jacking spring to enable the knob and the shell to be separated from the clamping state, and then the knob is twisted to lock the connector through matching with the locking structure. And then the knob is forced to ascend to be clamped with the shell through the elastic force applied by the first jacking spring, so that the connector is kept in a locked state, compared with a traditional mode, the two-step operation mode is not easy to learn by an infant, and the problem that potential safety hazards occur when the infant unlocks the lock by himself / herself is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of protective railings, and particularly relates to a lock head and a telescopic protective railing having the same. Background Art

[0002] Most telescopic railings are used indoors or in courtyards. The telescopic railing is used to separate the indoor space or the courtyard space, so as to form different temporary activity spaces indoors or in the courtyard for infants and young children to move. Specifically, the telescopic railing includes a lock head, a lower fixing seat, a rotating cylinder and a separating cloth. The rotating cylinder is pivotally installed between the lock head and the lower fixing seat. One end of the separating cloth is arranged on the rotating cylinder. A torsion spring is arranged inside the rotating cylinder. Through the rotational elastic force of the torsion spring, the rotating cylinder can be urged to rotate around its own axis in one direction, so as to realize that the rotating cylinder can wind up the separating cloth. When actually using the telescopic railing, the separating cloth is pulled out a certain length from the rotating cylinder by hand and the pulled-out end of the separating cloth is fixed. The torsion spring always applies force to the pulled-out separating cloth. After the separating cloth is wound back onto the rotating cylinder, the separated space can be released.

[0003] For the existing telescopic railing, the locking and unlocking of its roller both need manual operation. For example, the knob type structure mainly realizes the locking or unlocking of the roller by setting a knob on the lock head. The operation is relatively simple. However, due to the simplicity of the knob type structure, young children can easily learn to operate and unlock themselves to walk out of the separated space, which has certain potential safety hazards. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a lock head and a telescopic protective railing having the same, aiming to solve the problem that the unlocking method of the railing lock of the existing safety railing is relatively simple and young children can easily unlock it by themselves.

[0005] To achieve the above object, the utility model proposes a lock head, comprising:

[0006] A housing;

[0007] A connecting head pivotally installed on the housing;

[0008] A locking structure arranged inside the housing for locking the connecting head;

[0009] A knob pivotally installed on the housing and in linkage cooperation with the locking structure. The knob can pivot between a position where the connecting head is locked and a position where the connecting head is unlocked. Moreover, when the connecting head is locked or unlocked, the knob can move upward relative to the housing to engage with the housing, so as to limit the knob from pivoting;

[0010] A first top spring arranged on the housing for applying an elastic force to the knob in the direction of moving to engage with the housing.

[0011] Preferably, the knob is provided with a positioning portion, the housing is provided with a first positioning groove and a second positioning groove, and the positioning portion can swing between a position aligned with the first positioning groove vertically and a position aligned with the second positioning groove vertically as the knob pivots, and can be inserted into the first positioning groove or the second positioning groove as the knob moves upward to achieve the engagement.

[0012] Preferably, a connecting platform with the positioning portion is further provided. The knob is provided with a pin, and a slot is provided at a position corresponding to the pin on the top wall of the connecting platform. After the pin is inserted into the slot, it is locked by a screw to lock the connecting platform and the knob.

[0013] Preferably, the knob is provided with at least one of the pins, and the cross section of the pin is circular or non-circular.

[0014] Preferably, the locking structure includes a ratchet fixedly connected to the connecting head, a pawl pivotally mounted on one side of the ratchet, a locking member pivotally mounted on one side of the pawl, and a second top spring. The pawl can swing between a position engaging with the ratchet and a position away from the ratchet. The locking member can swing between a position abutted against the pawl and a position away from the pawl. When the pawl engages with the ratchet and the locking member abuts against the pawl, the pawl can be restricted from swinging away from the ratchet. The second top spring is used to apply an elastic force to the locking member to swing in the direction of abutting against the pawl;

[0015] The knob is provided with a first driving portion and a second driving portion. The first driving portion can swing between a position away from the locking member and a position forcing the locking member to swing away from the pawl as the knob pivots. The second driving portion can swing between a position away from the pawl and a position forcing the pawl to swing away from the ratchet as the knob pivots.

[0016] Preferably, the locking member and the pawl are respectively provided with a first actuating portion for contacting the first driving portion and a second actuating portion for contacting the second driving portion.

[0017] Preferably, a support plate is fixed at a position corresponding to the upper part of the pawl inside the housing. The support plate is respectively provided with a first strip-shaped hole for the first driving portion to pass through and a second strip-shaped hole for the second driving portion to pass through. The shape of the first strip-shaped hole is adapted to the swinging track of the first driving portion, and the shape of the second strip-shaped hole is adapted to the swinging track of the second driving portion.

[0018] Preferably, the shell includes an upper shell and a lower shell, the upper shell is provided with a accommodating cavity for accommodating the knob, the bottom wall of the accommodating cavity is provided with a through hole suitable for the connecting platform, the accommodating cavity is connected with the interior of the shell through the through hole, the through hole is provided with a surrounding edge extending toward the interior of the shell, the bottom of the surrounding edge is provided with a strip groove, the strip groove is suitable for the swing trajectory of the positioning part, and the first positioning groove and the second positioning groove are respectively located at two ends of the strip groove.

[0019] Preferably, a plug plate is further provided for fixing at a position to be installed, the shell is provided with a plug hole with a bottom opening, the plug hole is adapted to the plug plate and is used for the plug plate to be inserted or withdrawn from a vertical direction, a side of the plug hole close to the position to be installed is partially open so that a part of the plug plate is exposed, the shell is further provided with a locking key movably, the locking key can be moved between a position where the plug plate is partially plugged in with the plug plate relative to the shell to lock the plug plate in the plug hole and a position away from the unlocking position, a third top spring is further provided, the third top spring is used to apply an elastic force to the locking key in a direction of partial plugging with the plug plate, the locking key is further provided with a driving block extending out of the shell and exposed to the outside, and the locking key can be driven by the driving block to move in a direction away from the plug plate.

[0020] Preferably, the shell is also provided with a window, and a moving block that cooperates with the knob is movably installed at a position inside the shell corresponding to the position below the window, and the top wall of the moving block is provided with a first mark for indicating a locked state and a second mark for indicating an unlocked state, and the moving block can move between a position in which the first mark is aligned with the window and a position in which the second mark is aligned with the window as the knob pivots.

[0021] Preferably, a fourth top spring is provided, and the fourth top spring is used to apply an elastic force to the moving block to move in the direction of aligning the first mark with the window. The knob is provided with a strip portion which is narrow at one end and wide at the other end. The strip portion can swing between a position where the narrow end contacts the moving block and a position where the thick end contacts the moving block as the knob pivots.

[0022] The utility model also provides a telescopic protective door fence, comprising a lock head, and the lock head is the above-mentioned lock head.

[0023] In the technical solution of the present utility model, a connecting head is pivotally arranged in the housing of the lock head, and a locking structure is provided to lock or unlock the connecting head. A knob is pivotally arranged on the housing and is linked and cooperated with the locking structure, so as to lock or unlock the connecting head by pivoting the knob. When the connecting head is in the locked or unlocked state, the knob can also move upward relative to the housing and engage with the housing to limit the pivoting movement of the knob. A first top spring applies an elastic force to the knob in the direction of moving to engage with the housing. When unlocking the connecting head, it is necessary to first press the knob to overcome the elastic force applied by the first top spring to disengage the knob from the engaged state with the housing, and then turn the knob to unlock the connecting head through cooperation with the locking structure. The elastic force applied by the first top spring forces the knob to rise and engage with the housing, so that the connecting head remains in the unlocked state. When it is necessary to lock the connecting head, press the knob to overcome the elastic force applied by the first top spring to disengage the knob from the engaged state with the housing, and then turn the knob to lock the connecting head through cooperation with the locking structure. Then, the elastic force applied by the first top spring forces the knob to rise and engage with the housing, so that the connecting head remains in the locked state. Compared with the traditional one, the two-step operation method is not easy for children to learn, avoiding potential safety hazards caused by children unlocking the lock by themselves. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a perspective view of the lock head at the first angle;

[0025] Figure 2 is a perspective view of the lock head at the second angle;

[0026] Figure 3 is an exploded view of the lock head at the first angle;

[0027] Figure 4 is an exploded view of the lock head at the second angle;

[0028] Figure 5 is a schematic diagram of the cooperation between the strip-shaped part and the moving block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0030] It should be noted that if there are directional indications involved in the embodiments of the present utility model (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture (as shown in the attached drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0031] In addition, if there are descriptions involving "first" or "second" in the embodiments of the present utility model, then such descriptions of "first" or "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0032] The present utility model provides a lock head.

[0033] In the embodiments of the present utility model, as Figures 1 to 4 shown, the lock head includes a housing, a connecting head, a knob, and a first top spring.

[0034] Among them, the connecting head 100 is pivotally installed on the housing 1; the locking structure is arranged inside the housing 1 for locking the connecting head 100; the knob 2 is pivotally installed on the housing 1 and is in linkage cooperation with the locking structure. The knob 2 can pivot between a position where the connecting head 100 is locked and a position where the locking is released. Moreover, when the connecting head 100 is locked or the locking is released, the knob 2 can move upward relative to the housing 1 to engage with the housing 1 to restrict the knob 2 from pivoting; the first top spring 200 is arranged on the housing to apply an elastic force to the knob 2 in the direction of moving to engage with the housing 1.

[0035] Specifically, the knob 2 is provided with a positioning portion 21, the housing 1 is provided with a first positioning groove 11 and a second positioning groove 12. The positioning portion 21 can swing between a position where it is vertically aligned with the first positioning groove 11 and a position where it is vertically aligned with the second positioning groove 12 as the knob 2 pivots (for example, when the connecting head 100 is locked, the positioning portion 21 is aligned with the first positioning groove 11, and when the connecting head 100 is unlocked, the positioning portion 21 is aligned with the second positioning groove 12) and can be inserted into the first positioning groove 11 or the second positioning groove 12 as the knob 2 moves upward to achieve the engagement.

[0036] Specifically, the number of the positioning parts 21 is two, and the numbers of the first positioning groove 11 and the second positioning groove 12 correspondingly are two.

[0037] Specifically, there is also a connecting platform 22 with the positioning part 21. The knob 2 is provided with a plug pin 23. A slot 24 is provided at the position corresponding to the plug pin 23 on the top wall of the connecting platform 22. After the plug pin 23 is inserted into the slot 24, it is locked by a screw to lock the connecting platform 22 and the knob 2.

[0038] Specifically, the cross-section of the connecting platform 22 is circular, and the positioning part 21 is formed on the peripheral wall of the connecting platform 22.

[0039] Specifically, the knob 2 is provided with at least one plug pin 23, and the cross-section of the plug pin 23 is circular or non-circular.

[0040] Specifically, in this embodiment, the knob 2 is provided with three plug pins 23, and the three plug pins 23 are distributed at intervals in a ring shape.

[0041] Specifically, the locking structure includes a ratchet wheel 31 fixedly connected to the connecting head 100, a pawl 32 pivotally mounted on one side of the ratchet wheel 31, a locking member 33 pivotally mounted on one side of the pawl 32, and a second top spring 34. The pawl 32 can swing between a position engaging with the ratchet wheel 31 and a position away from it. The locking member 33 can swing between a position abutting against the pawl 32 and a position away from it. When the pawl 32 engages with the ratchet wheel 31 and the locking member 33 abuts against the pawl 32, the swing of the pawl 32 in the direction away from the ratchet wheel 31 can be restricted. The second top spring 34 is used to apply an elastic force to the locking member 33 to swing it in the direction of abutting against the pawl 32.

[0042] The knob 2 is provided with a first driving part 25 and a second driving part 26. The first driving part 25 can swing between a position away from the locking member 33 and a position forcing the locking member 33 to swing in the direction away from the pawl 32 as the knob 2 pivots. The second driving part 26 can swing between a position away from the pawl 32 and a position forcing the pawl 32 to swing in the direction away from the ratchet wheel 31 as the knob 2 pivots. The knob 2 realizes the linkage cooperation with the locking structure through the first driving part 25 and the second driving part 26.

[0043] Specifically, the first driving part 25 and the second driving part 26 are formed at the bottom of the connecting platform 22.

[0044] Specifically, the locking member 33 and the pawl 32 are respectively provided with a first actuating part 35 for contacting the first driving part 25 and a second actuating part 36 for contacting the second driving part 26.

[0045] Specifically, a support plate 4 is fixed inside the housing 1 at a position corresponding to above the pawl 32. The support plate 4 is respectively provided with a first strip-shaped hole 41 through which the first driving part 25 can pass and a second strip-shaped hole 42 through which the second driving part 26 can pass. The shape of the first strip-shaped hole 41 is adapted to the swinging trajectory of the first driving part 25, and the shape of the second strip-shaped hole 42 is adapted to the swinging trajectory of the second driving part 26. One end of the first top spring 200 elastically abuts against the support plate 4, and the other end elastically abuts against the connecting platform 22.

[0046] Specifically, the first driving part 25 and the second driving part 26 are strip-shaped and have sufficient length. When the positioning part 21 is inserted into the first positioning groove 11 or the second positioning groove 12, the first driving part 25 and the second driving part 26 still pass through the first strip-shaped hole 41 and the second strip-shaped hole 42 respectively, so as to avoid the situation that the knob 2 is disengaged from the interlocking cooperation with the locking structure.

[0047] Specifically, the housing 1 includes an upper housing and a lower housing. The upper housing is provided with a receiving cavity 13 for receiving the knob 2. The bottom wall of the receiving cavity 13 is provided with a through hole 14 adapted to the connecting platform 22. The receiving cavity 13 is communicated with the inside of the housing 1 through the through hole 14. The through hole 14 is provided with a surrounding edge 15 extending in the direction of the inside of the housing 1. The bottom of the surrounding edge 15 is provided with a strip-shaped groove 16. The strip-shaped groove 16 is adapted to the swinging trajectory of the positioning part 21. The first positioning groove 11 and the second positioning groove 12 are respectively located at both ends of the strip-shaped groove 16.

[0048] Specifically, the upper housing and the lower housing are fixed by screws or by a snap structure. When it is a snap structure, reference can be made to the prior art, and the specific structural principle thereof will not be described in detail herein.

[0049] Specifically, there is also a plug board 51 for fixing at the position to be installed. The housing 1 is provided with a jack 52 with an opening at the bottom. The jack 52 is adapted to the plug board 51 for the plug board 51 to be inserted or withdrawn from the vertical direction. One side of the jack 52 close to the position to be installed is partially open, so that a part of the plug board 51 is exposed. The housing 1 is also movably provided with a locking key 53. The locking key 53 can move relative to the housing 1 between a position where it is partially inserted into the plug board 51 to lock the plug board 51 in the jack 52 and a position where the locking is released. There is also a third top spring 54. The third top spring 54 is used to apply an elastic force to the locking key 53 in the direction of moving towards the position where it is partially inserted into the plug board 51. The locking key 53 is also provided with a driving block 55 protruding out of the housing 1 and exposed outside. The locking key 53 can be driven to move away from the plug board 51 by the driving block 55.

[0050] Specifically, the location to be installed is mainly a wall. During installation, the plug plate 51 is first locked on the wall by screws. The shell 1 moves downward to insert the plug plate 51 into the socket 52 to fix the lock on the wall. The shell 1 moves upward to remove the lock from the wall. The installation is quick and convenient. The partially open lock hole makes the plug plate 51 partially exposed, which can form an avoidance during the connection between the plug plate 51 and the socket 52, and prevent the plug plate 51 from being removed in the horizontal direction.

[0051] Specifically, in one embodiment, Figure 5 As shown, the shell is also provided with a window 17, and a moving block 18 that cooperates with the knob is movably installed at a position corresponding to the position below the window 17 inside the shell, and the top wall of the moving block 18 is provided with a first mark 181 for indicating a locked state and a second mark 182 for indicating an unlocked state. The moving block 18 can move between a position in which the first mark 181 is aligned with the window 17 and a position in which the second mark 182 is aligned with the window 17 as the knob is pivoted.

[0052] Furthermore, a fourth top spring 19 is provided, and the fourth top spring 19 is used to apply an elastic force to the moving block 18 to move in the direction of aligning the first mark 181 with the window 17. The knob is provided with a strip portion 27 which is narrow at one end and wide at the other end. The strip portion 27 can swing between a position where the narrow end contacts the moving block 18 and a position where the thick end contacts the moving block 18 as the knob pivots. When the narrower end of the strip portion 27 contacts the moving block 18, the first mark 181 is aligned with the window 17. When the knob is pivoted, the strip portion 27 gradually transitions from contacting the moving block 18 at the narrower end to contacting the moving block 18 at the wider end, forcing the moving block 18 to overcome the elastic force applied by the fourth top spring 19 and move in the direction of alignment of the second mark 182 with the window 17, until the wider end of the strip portion 27 abuts against the moving block 18, and the second mark 182 is aligned with the window 17. It is only necessary to pivot the knob in the reverse direction to release the pressure applied by the strip portion 27 on the moving block 18, and then cooperate with the elastic force applied by the fourth top spring 19 to move the first mark 181 to align with the window 17.

[0053] Specifically, the strip portion 27 and the connecting platform are an integrally formed structure.

[0054] The utility model also proposes a telescopic protective door fence, including a lock. Other specific contents of the lock can be referred to the above-mentioned embodiments. Since the telescopic protective door fence adopts all technical solutions of all embodiments of the above-mentioned lock, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0055] Specifically, the telescopic protective gate mainly includes the lock, the lower fixed seat, the rotating drum and the dividing cloth. The rotating drum can be pivotally installed between the lock and the lower fixed seat. Specifically, the lower end of the rotating drum is pivotally connected to the lower fixed seat, and the upper end of the rotating drum is fixedly connected to the connecting head pivotally installed on the lock. One end of the dividing cloth is arranged on the rotating drum, and a torsion spring is arranged in the rotating drum. The rotational elastic force of the torsion spring can cause the rotating drum to rotate in one direction around its own axis, thereby realizing that the rotating drum can retract the dividing cloth. For other specific structures of the telescopic protective gate, reference can be made to the prior art, and its specific structural principle will not be repeated here.

[0056] The technical solution of the utility model is that a connecting head can be pivotally arranged in the housing of the lock head and a locking structure is provided to lock or unlock the connecting head. A knob that cooperates with the locking structure can be pivotally arranged in the housing to lock or unlock the connecting head by pivoting the knob. When the connecting head is in a locked or unlocked state, the knob can also make an upward movement relative to the housing and engage with the housing to limit the pivoting movement of the knob, and an elastic force is applied to the knob in the direction of engagement with the housing through a first top spring. When unlocking the connecting head, the knob needs to be pressed first to overcome the elastic force applied by the first top spring so that the knob is separated from the housing. When the connector needs to be locked, the knob is pressed to overcome the elastic force applied by the first top spring to disengage the knob from the housing and then the knob is turned to lock the connector through cooperation with the locking structure. Thereafter, the elastic force applied by the first top spring forces the knob to rise and engage with the housing, thereby keeping the connector in the locked state. Compared with the traditional method, the two-step operation method is not easy for young children to learn, thus avoiding safety hazards caused by young children unlocking the connector by themselves.

[0057] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A lock head, characterized in that, Comprising: A housing (1); A connector (100) pivotally mounted on the housing (1); A locking structure disposed inside the housing (1) for locking the connector (100); A knob (2) pivotally mounted on the housing (1) and in linkage cooperation with the locking structure. The knob (2) can pivot between a position where the connector (100) is locked and a position where the locking is released. Moreover, when the connector (100) is locked or the locking is released, the knob (2) can move upward relative to the housing (1) to engage with the housing (1), so as to restrict the knob (2) from pivoting; A first top spring (200) disposed in the housing for applying an elastic force to the knob (2) in a direction of moving towards engagement with the housing (1).

2. The lock head according to claim 1, characterized in that: The knob (2) is provided with a positioning portion (21). The housing (1) is provided with a first positioning groove (11) and a second positioning groove (12). The positioning portion (21) can swing between a position aligned with the first positioning groove (11) vertically and a position aligned with the second positioning groove (12) vertically as the knob (2) pivots, and can be inserted into the first positioning groove (11) or the second positioning groove (12) as the knob (2) moves upward to achieve the engagement.

3. The lock head according to claim 2, characterized in that: A connecting platform (22) having the positioning portion (21) is further provided. The knob (2) is provided with a pin (23). A slot (24) is provided at a position corresponding to the pin (23) on the top wall of the connecting platform (22). After the pin (23) is inserted into the slot (24), it is locked by a screw to lock the connecting platform (22) and the knob (2).

4. The lock head according to claim 3, characterized in that: The knob (2) is provided with at least one pin (23), and the cross-section of the pin (23) is circular or non-circular.

5. The lock head according to claim 1, characterized in that: The locking structure includes a ratchet wheel (31) fixedly connected to the connector (100), a pawl (32) pivotally mounted on one side of the ratchet wheel (31), a locking member (33) pivotally mounted on one side of the pawl (32), and a second top spring (34). The pawl (32) can swing between a position engaging with the ratchet wheel (31) and a position away from it. The locking member (33) can swing between a position abutted against the pawl (32) and a position away from it. When the pawl (32) engages with the ratchet wheel (31) and the locking member (33) abuts against the pawl (32), the pawl (32) can be restricted from swinging away from the ratchet wheel (31). The second top spring (34) is used for applying an elastic force to the locking member (33) in a direction of swinging towards abutting against the pawl (32); The knob (2) is provided with a first driving portion (25) and a second driving portion (26). The first driving portion (25) can swing between a position away from the locking member (33) and a position forcing the locking member (33) to swing away from the pawl (32) as the knob (2) pivots. The second driving portion (26) can swing between a position away from the pawl (32) and a position forcing the pawl (32) to swing away from the ratchet wheel (31) as the knob (2) pivots.

6. The lock head according to claim 5, characterized in that: The locking member (33) and the ratchet pawl (32) are respectively provided with a first urging portion (35) for contacting the first driving portion (25) and a second urging portion (36) for contacting the second driving portion (26).

7. The lock head according to claim 5, characterized in that: A support plate (4) is fixed inside the housing (1) at a position above the ratchet pawl (32), and the support plate (4) is respectively provided with a first strip hole (41) for the first driving part (25) to pass through and a second strip hole (42) for the second driving part (26) to pass through, the shape of the first strip hole (41) being adapted to the swing trajectory of the first driving part (25), and the shape of the second strip hole (42) being adapted to the swing trajectory of the second driving part (26).

8. The lock head according to claim 3, characterized in that: The shell (1) comprises an upper shell and a lower shell, the upper shell is provided with a receiving cavity (13) for receiving the knob (2), the bottom wall of the receiving cavity (13) is provided with a through hole (14) which is compatible with the connecting platform (22), the receiving cavity (13) is communicated with the interior of the shell (1) through the through hole (14), the through hole (14) is provided with a surrounding edge (15) extending toward the interior of the shell (1), the bottom of the surrounding edge (15) is provided with a strip groove (16), the strip groove (16) is compatible with the swing trajectory of the positioning portion (21), and the first positioning groove (11) and the second positioning groove (12) are respectively located at two ends of the strip groove (16).

9. The lock head according to claim 1, wherein: A plug board (51) is also provided for fixing at a position to be installed. The housing (1) is provided with a plug hole (52) with a bottom opening. The plug hole (52) is adapted to the plug board (51) and is used for allowing the plug board (51) to be inserted or withdrawn from a vertical direction. A side of the plug hole (52) close to the position to be installed is partially open so that a part of the plug board (51) is exposed. The housing (1) is also provided with a movably provided locking key (53). The locking key (53) can be partially locked relative to the housing (1). The plug board (51) is plugged in so as to lock the plug board (51) in the plug hole (52) and move between a position away from the unlocking position. A third top spring (54) is also provided. The third top spring (54) is used to apply an elastic force to the locking key (53) to move in a direction of local plugging with the plug board (51). The locking key (53) is also provided with a driving block (55) extending out of the housing (1) and exposed to the outside. The driving block (55) can drive the locking key (53) to move in a direction away from the plug board (51).

10. The lock head according to claim 1, characterized in that: The housing is also provided with a window (17), and a moving block (18) that cooperates with the knob is movably installed in the housing at a position corresponding to the position below the window (17), and the top wall of the moving block (18) is provided with a first mark (181) for indicating a locked state and a second mark (182) for indicating an unlocked state, and the moving block (18) can move between a position in which the first mark (181) is aligned with the window (17) and a position in which the second mark (182) is aligned with the window (17) as the knob pivots.

11. The lock head according to claim 10, wherein: A fourth top spring (19) is further provided. The fourth top spring (19) is used to apply an elastic force to the moving block (18) in a direction that makes the first mark (181) align with the window (17). The knob is provided with a strip-shaped portion (27) that is narrow at one end and wide at the other end. The strip-shaped portion (27) can swing between a position where it contacts the moving block (18) at the narrow end and a position where it contacts the moving block (18) at the thick end as the knob pivots.

12. A telescopic protective railing, characterized in that: It includes a lock head according to any one of claims 1 to 11.

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