Double-locking safety door fence

Abstract

The utility model discloses a double-locking safety door fence which comprises a door frame and a door leaf hinged in the door frame, a switch shell is arranged on the door leaf, an upper spring bolt and a lower spring bolt are arranged in the switch shell and at the bottom of the door leaf respectively, and an upper lock catch and a lower lock catch are arranged on the door frame. An upper unlocking piece and a lower unlocking piece are respectively arranged on the switch shell, the lower unlocking piece is connected with the lower spring bolt through a connecting piece, and the switch shell is provided with a double-lock structure which can only press the upper unlocking piece to drive the upper spring bolt to retract after the lower unlocking piece is pressed. The utility model aims to provide a double-lock structure which enables the upper unlocking piece and the lower unlocking piece to be linked with each other, so that the operation process of a user is simplified, and meanwhile, the safety of the lock is improved. According to the double-locking safety door fence, the user needs to operate the lower unlocking piece firstly to further unlock the upper spring bolt, the double-locking safety door fence effectively prevents the accidental opening condition through the double-operation design, and the operation simplicity and convenience are taken into account while the safety is ensured.

Description

Technical Field

[0001] The utility model relates to the field of safety barriers, and particularly to a safety barrier with double locking. Background Art

[0002] A safety barrier is a home safety device used to protect children and pets. It is generally used in areas that need to be isolated, such as the stairway entrance, kitchen entrance, balcony, etc. Its main function is to prevent children and pets from accidentally entering dangerous areas, thereby ensuring safety. Most of the existing safety barriers are designed to open in both directions, facilitating users to pass through from any direction, and are equipped with a lock that can automatically lock after the barrier is closed. To prevent children from easily unlocking the barrier and further enhance safety, some barriers adopt a double-lock design, requiring users to press buttons at two different positions simultaneously to unlock the upper and lower locks when unlocking the barrier, so as to open the barrier. This design can prevent children from easily opening the barrier due to a single simple action, greatly reducing the possibility of children unlocking it by themselves, and thus effectively preventing them from accidentally entering dangerous areas. There are also some barriers that use complex rotary or sliding unlocking devices, making the unlocking process not only require a certain amount of strength but also more complex operations, which is quite difficult for young children and further enhances the protection effect.

[0003] Although the existing safety barriers adopt a double-locking mechanism to prevent children from easily unlocking, these methods can only effectively protect relatively young children. However, as children grow older, their observation and imitation abilities gradually increase. When slightly older children are tall enough to reach the unlocking button of the barrier, they may learn how to open these double locks by observing their parents' unlocking operations, or even through repeated trials or random button presses. Once children master the unlocking skills, the protective effect of the safety barrier will be greatly reduced, and potential safety hazards will increase accordingly. In such a situation, children may enter the originally restricted areas, such as the kitchen, balcony or stairway entrance, on their own, facing higher accidental risks. Although the complex unlocking device has a significant effect in preventing children from accidentally opening it, it may also bring some inconveniences to daily use. First of all, the cumbersome unlocking process may cause inconvenience to users when they need to quickly pass through the barrier, especially in scenarios where they need to frequently enter and exit the isolated area, such as the kitchen, living room, etc. Such repeated complex operations are likely to make people feel tired or impatient, and may even lead to users being unwilling to always keep the barrier locked, thereby increasing potential safety risks.

[0004] Therefore, additional protective measures are still needed to supplement the safety means for the existing safety barriers to solve the existing problems in preventing children from accidentally opening them. Summary of the Utility Model

[0005] The purpose of the present utility model is to provide a safety door barrier with a dual - locking structure that is simple in structure and convenient and fast to open.

[0006] To achieve the above - mentioned purpose, the present utility model adopts the following solution: A dual - locking safety door barrier, which includes a "U"-shaped door frame and a door leaf hinged inside the door frame and capable of opening or closing forward and backward. At the upper corner point on the non - hinged side of the door leaf, there is a switch housing. Inside the switch housing and at the bottom of the door leaf, there are respectively a retractable upper locking tongue and a lower locking tongue. On the door frame, there are respectively an upper locking buckle and a lower locking buckle corresponding to and cooperating with the upper locking tongue and the lower locking tongue. On the switch housing, there are respectively an upper unlocking member capable of driving the upper locking tongue to retract from the upper locking buckle and a lower unlocking member capable of driving the lower locking tongue to retract from the lower locking buckle. The lower unlocking member is connected to the lower locking tongue through a connecting member and is provided with a two - stage locking structure that the upper unlocking member can be pressed only after the lower unlocking member is pressed to drive the upper locking tongue to retract. By inter - linking the upper unlocking member and the lower unlocking member, the operation process of the user is simplified, and at the same time, the security of the lock is increased. The user needs to operate the lower unlocking member first to further unlock the upper locking tongue. Operating the upper unlocking member alone cannot drive the upper locking tongue to retract and unlock. This design of dual operation effectively prevents accidental opening, and is especially suitable for children's safety door barriers. While ensuring safety, this structure also takes into account the simplicity of operation, making the user feel more convenient and at ease during daily use.

[0007] As a preferred embodiment of the present utility model, an upper locking tongue groove is provided inside the switch housing. The upper locking tongue is horizontally slidably arranged in the upper locking tongue groove. The front end of the upper locking tongue groove is provided with an upper locking tongue hole capable of accommodating the front end of the upper locking tongue to extend out and insert into the upper locking buckle. On the top of the upper locking tongue, there is an extrusion inclined surface. Inside the switch housing above and below the upper locking tongue groove, there are respectively an upper key groove capable of penetrating the top surface of the switch housing and communicating with the upper locking tongue groove below and a lower key groove capable of penetrating the bottom surface of the switch housing and communicating with the upper locking tongue groove above. The upper unlocking member includes a pressing plate with one end hinged in the upper key groove. A push rod extends downward from the bottom of the pressing plate, and the end of the push rod slidably abuts against the extrusion inclined surface. The lower unlocking member is installed in the lower key groove to move up and down. Setting the upper locking tongue groove inside the switch housing and realizing the cooperation with the upper locking buckle through the horizontal sliding of the upper locking tongue effectively improves the stability and accuracy of the lock. By pressing the pressing plate of the upper unlocking member to make the push rod abut against and extrude the extrusion inclined surface on the upper locking tongue, and then driving the upper locking tongue to retract, the sliding of the upper locking tongue is smoother, avoiding the situation of the locking tongue getting stuck. The overall design of this solution not only improves the durability of the lock, but also ensures the reliable locking state of the lock after each use.

[0008] As a further solution of the utility model, the two-way lock structure includes a clearance groove arranged on at least one side of the outer wall of the upper lock tongue, the opening of the clearance groove extends to the tail of the upper lock tongue, and a push rod corresponding to the clearance groove and capable of abutting against the tail of the upper lock tongue is provided on the lower unlocking member. When the lower unlocking member moves upward along the lower key groove and aligns the push rod with the opening of the clearance groove, the upper lock tongue is squeezed back by the push rod, and the push rod can be inserted into the clearance groove. The two-way lock structure realizes the restriction of the action of the upper lock tongue by the lower unlocking member through the cooperation of the clearance groove and the push rod. Only when the lower unlocking member moves to a specific position can the push rod be inserted into the clearance groove, and then the upper lock tongue is allowed to be pushed back by the pressure plate. This interlocking mechanism effectively reduces the possibility of children unlocking the lock by simple attempts, and also improves the overall protection performance of the lock. It has a significant effect in particular for scenes where children need to be prevented from accidentally unlocking the lock. The overall design of the double lock effectively increases the lock's ability to prevent misoperation, ensuring that the door rail remains securely locked when subjected to external force or misoperation.

[0009] As a preferred solution of the utility model, a first reset member capable of keeping the front end of the upper lock tongue extending out of the upper lock tongue hole is pressed between the tail of the upper lock tongue and the tail of the upper lock tongue groove, and a second reset member capable of moving downward again and resetting after the lower lock tongue moves upward is provided between the lower unlocking member and the top of the lower key groove. By providing reset members in the upper lock tongue and the lower unlocking member, an automatic reset function is achieved. This design ensures that after each operation, the lock can allow the first reset member and the second reset member to respectively restore the upper lock tongue and the lower unlocking member to the initial locked state, thereby avoiding potential safety hazards caused by human negligence. The coordinated work of the reset member, the lock tongue and the unlocking member makes the operation of the lock smoother, and also enhances the user's sense of security and convenience in actual use.

[0010] As a preferred solution of the utility model, a lower lock shell with a cavity inside is provided at the lower corner point of the door leaf on the non-hinged side, the lower lock tongue is telescopically arranged in the inner cavity of the lower lock shell, the bottom of the lower lock shell is provided with a lower lock tongue hole connected to the inner cavity, a pull rope hole is passed through the top of the lower lock shell, the connecting member is a pull rope inserted in the door leaf, one end of the pull rope passes through the pull rope hole and is fixed on the lower lock tongue, and the other end of the pull rope is fixed on the lower unlocking member, and a third reset member that can keep the lower lock tongue extending out of the lower lock tongue hole and inserted into the corresponding lower lock buckle below is provided in the inner cavity between the lower lock tongue and the top of the lower lock shell. By arranging the lower lock shell at the lower corner of the non-hinged side of the door leaf and connecting the lower unlocking member and the lower lock tongue through the pull rope, the telescopic control of the lower lock tongue is realized. The user only needs one operation to complete the unlocking of the upper and lower locks. This design not only improves the convenience of operation, but also ensures the synchronization and accuracy of the lock tongue action, and effectively improves the protection effect of the overall door fence.

[0011] As a further solution of the present utility model, an upper rotating shaft is provided at the upper corner point of the door leaf far away from the switch housing. An articulated seat is provided on the door frame column adjacent to the upper rotating shaft. An upper shaft seat is provided on the articulated seat, which extends upward in a tubular shape and can rotatably insert the upper rotating shaft. A lower rotating shaft is provided at the lower corner point of the door leaf corresponding to the lower part of the upper rotating shaft. The lower rotating shaft is movably inserted into the bottom cross beam of the door frame. At the top of the upper shaft seat, a downwardly concave "V"-shaped groove is symmetrically provided. An outer circumference of the upper rotating shaft is provided with a triangular block with a tip protruding downward and capable of inserting into the corresponding "V"-shaped groove. Through the cooperation of the "V"-shaped groove at the top of the upper shaft seat and the triangular block on the upper rotating shaft, the door leaf can automatically reset to the closed state after being opened. This design can achieve the automatic closing of the door leaf without additional operation, further enhancing the protection function of the door barrier, reducing the risk of the door barrier not being closed due to human negligence, and also improving the convenience of users.

[0012] As a further solution of the present utility model, a positioning groove for accommodating the tip of the triangular block to be embedded is provided at the top of the upper shaft seat. The positioning groove and the "V"-shaped groove are in a cross shape and are distributed on the peripheral edge of the top of the upper shaft seat. The design of the mutual engagement between the positioning groove and the triangular block enables the door leaf to stop in the fully open state when it is opened relative to the door frame by 90 degrees and will not automatically close, thus facilitating the need for frequent entry in a short period of time.

[0013] As a further solution of the present utility model, a spring groove coaxial and communicating with the inner cavity of the upper shaft seat is provided at the bottom of the articulated seat. The diameter of the spring groove is larger than the diameter of the inner cavity of the upper shaft seat and the bottom penetrates the bottom surface of the articulated seat. The bottom end of the upper rotating shaft extends downward into the spring groove. A spring base with an outer edge capable of closing the bottom opening of the spring groove is installed at the bottom end of the upper rotating shaft by screws. A top push spring capable of sleeving on the bottom end of the upper rotating shaft is provided between the spring base and the inner wall of the top of the spring groove. By providing a top push spring at the bottom end of the upper rotating shaft, the automatic reset function after the door leaf is opened is realized. On the basis of further ensuring that the door leaf resets by its own weight, this design also enhances the closing force and reliability of the door leaf, ensuring the continuous effectiveness and stability of the door barrier after multiple uses and preventing the door leaf from being stuck by the friction of the rotating shaft when closing.

[0014] As a preferred solution of the utility model, the end of the pressing plate away from the hinged side is provided with a first hook that can be caught on the inner edge of the top opening of the upper key slot, and the first hook can prevent the end of the pressing plate away from the hinged side from being separated from the upper key slot, and the front and rear ends of the lower unlocking piece are respectively provided with second hooks that can prevent the lower unlocking piece from being separated from the lower key slot. By arranging hooks on the pressing plate and the lower unlocking piece, these components are prevented from being separated from the slot during use. This design effectively enhances the overall firmness of the lock, ensures the long-term stable use of the door rail, and also reduces the safety hazards caused by the falling off of components.

[0015] As a further solution of the utility model, the upper lock tongue includes an upper lock tongue shell, a telescopic groove is provided in the upper lock tongue shell, the front end of the telescopic groove passes through the front side of the upper lock tongue shell, a lock bolt that can slide back and forth in the telescopic groove is provided in the telescopic groove, a fourth reset member is pressed between the tail of the lock bolt and the inner wall of the tail of the telescopic groove, an anti-slip groove is provided at the top of the telescopic groove, an anti-slip block that can be inserted into the anti-slip groove and move back and forth in the anti-slip groove is provided at the top of the lock bolt, an extrusion groove is provided on the left and right outer walls of the upper lock tongue shell respectively, the extrusion slope is provided on the wall surface of the extrusion groove facing the rear side, the give way groove is respectively provided on the left and right outer walls of the upper lock tongue shell on the rear side of the extrusion groove, and the first reset member is provided at the center of the rear side wall of the upper lock tongue shell. The upper lock tongue consists of an upper lock tongue shell and a retractable lock bolt installed in the upper lock tongue shell, and the design of this double telescopic structure can provide a stronger fixing effect when locking. The inner lock bolt can extend into the upper lock buckle when locked, while the outer lock tongue shell provides additional support for it, ensuring that the door is more stable in the locked state and not easily opened by external force. In addition, the lock bolt's automatic retraction and reset design allows the lock bolt to retract when the door leaf is closed, without the need for the entire lock tongue shell to retract, which makes the door leaf close more smoothly.

[0016] In summary, the beneficial effects of the present invention compared to the prior art are as follows: the present invention realizes the linkage mechanism of the upper and lower unlocking parts through the two-lock design, which effectively increases the complexity of the unlocking operation. The user must first press the lower unlocking part located below the switch housing before operating the upper unlocking part. Such a design greatly improves the effect of preventing children from misunderstanding the lock. For children who are younger and have limited observation ability, it is difficult to complete two steps at the same time by simply pressing randomly, which greatly reduces their possibility of successfully unlocking. Compared with the traditional single locking method, this double locking mechanism is safer and can effectively prevent children from accidentally entering dangerous areas, thereby ensuring their safety.

[0017] On this basis, the utility model realizes the automatic closing function of the door leaf through the cooperative design of the "V"-shaped groove and the triangular block at the hinge position of the door leaf. When the user gently pushes open the door leaf, the door leaf can automatically close at a certain angle, which not only reduces the tediousness of manual operation but also prevents potential safety hazards caused by forgetting to close the door leaf. The mutual clamping design of the positioning groove and the triangular block ensures that the door leaf can maintain a stable open state when fully opened to 90 degrees, thus meeting the needs of users for frequent entry and exit in a short period. This ensures both safety and convenience in daily use.

[0018] In addition, the double telescopic design of the locking tongue provides higher strength and security for the lock. During use, the locking tongue can flexibly extend and retract according to actual needs, thus achieving a more stable locking effect. At the same time, this design also reduces the wear of the locking tongue, avoids damage caused by frequent use, and extends the service life of the product. Brief Description of the Drawings

[0019] Figure 1 It is a three-dimensional view after the door leaf of the utility model is closed.

[0020] Figure 2 It is one of the three-dimensional views after the door leaf of the utility model is opened.

[0021] Figure 3 It is Figure 2 the enlarged view of part A in

[0022] Figure 4 It is the second three-dimensional view after the door leaf of the utility model is opened, and the enlarged three-dimensional structure view inside the switch housing in the figure.

[0023] Figure 5 It is the first sectional view of the utility model, and the enlarged view of the local area in the figure.

[0024] Figure 6 It is the second sectional view of the utility model, and the enlarged view of the local area in the figure.

[0025] Figure 7 It is Figure 6 the enlarged view of part B in

[0026] Figure 8 It is the third sectional view of the utility model, and the enlarged view of the local area in the figure.

[0027] Figure 9 It is the first exploded view of the utility model, and the enlarged view of the local area in the figure.

[0028] Figure 10 It is Figure 9 the enlarged view of part C in

[0029] Figure 11 is Figure 9 an enlarged view of the D position in

[0030] Figure 12 is the second exploded view of the present utility model, and an enlarged view of a partial area in the figure.

[0031] Figure 13 is Figure 12 an enlarged view of the E position in

[0032] Figure 14 is the sectional view after the decomposition of the present utility model, and an enlarged view of a partial area in the figure.

[0033] Explanation of reference numerals: 1, door frame; 2, door leaf; 3, switch housing; 4, upper locking tongue; 5, lower locking tongue; 6, upper unlocking member; 7, lower unlocking member; 8, secondary lock structure; 11, upper lock catch; 12, lower lock catch; 20, upper shaft seat; 21, upper rotating shaft; 22, hinge seat; 23, "V"-shaped groove; 24, triangular block; 25, lower rotating shaft; 26, spring groove; 27, spring base; 28, pushing spring; 29, positioning groove; 30, upper locking tongue hole; 31, upper locking tongue groove; 32, upper button groove; 33, lower button groove; 34, strip-shaped groove; 40, upper locking tongue housing; 41, extrusion inclined surface; 42, relief groove; 43, first reset member; 44, telescopic groove; 45, locking bolt; 46, fourth reset member; 47, anti-detachment groove; 48, anti-detachment block; 49, extrusion groove; 50, connecting member; 51, lower lock housing; 52, lower locking tongue hole; 53, pull rope hole; 54, third reset member; 60, pressing plate; 61, push rod; 62, first hook; 71, ejector rod; 72, second reset member; 73, second hook. Specific embodiments

[0034] The following specific implementation content provides various different embodiments or examples for implementing the present utility model. Of course, these are only embodiments or examples and are not intended to be restrictive. Additionally, repeated reference numerals may be used in different embodiments, such as repeated numbers and / or letters. These repetitions are for the purpose of simply and clearly describing the present invention and do not represent a specific relationship between the different embodiments and / or structures discussed.

[0035] In addition, spatial-related terms may be used, such as "below", "lower side", "from inside to outside", "above", "upper side" and similar terms. These relational terms are used to facilitate the description of the relationship between some elements or features and other elements or features in the drawings. These spatial relationship terms include different orientations of the device during use or operation, as well as the orientations described in the drawings. The device may be rotated 90 degrees or other orientations, and the spatial-related adjectives used therein can be similarly interpreted. Therefore, it cannot be understood as a limitation of the present invention. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying 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 one or more of such features.

[0036] The following further describes the present utility model in conjunction with the accompanying drawing illustration and specific embodiments: As Figures 1 to 14 shown, a double-locking safety railing includes a "U"-shaped door frame 1. The door frame 1 is composed of two vertically spaced columns and a cross beam connected to the bottom ends of the two columns. The door frame 1 is fixed to the door frame or wall by installing bolts at the four corner points of the two columns, which is basically the same as the fixing method in the prior art. A door leaf 2 that can be opened or closed forward and backward is hinged inside the door frame 1. A switch housing 3 is provided at the upper corner point on the non-hinged side of the door leaf 2. An upper locking tongue 4 and a lower locking tongue 5 are respectively telescopically provided inside the switch housing 3 and at the bottom of the door leaf 2. An upper locking buckle 11 and a lower locking buckle 12 corresponding to and cooperating with the upper locking tongue 4 and the lower locking tongue 5 are respectively provided on the door frame 1. An upper unlocking member 6 that can drive the upper locking tongue 4 to retract from the upper locking buckle 11 and a lower unlocking member 7 that can drive the lower locking tongue 5 to retract from the lower locking buckle 12 are respectively provided on the switch housing 3. The upper locking tongue 4 and the lower locking tongue 5 are both designed to be telescopic and cooperate with the upper locking buckle 11 and the lower locking buckle 12 on the door frame 1 respectively, ensuring the locking of the door leaf 2. When the user needs to unlock, the upper unlocking member 6 and the lower unlocking member 7 must be operated. Among them, the lower unlocking member 7 is connected to the lower locking tongue 5 through a connecting member 50, and a two-stage locking structure 8 is provided that the upper unlocking member 6 can be driven to retract the upper locking tongue 4 only after the lower unlocking member 7 is pressed. The advantage of this design is to increase the complexity of unlocking and prevent children from accidentally unlocking. The user must first press the lower unlocking member located below the switch housing to operate the upper unlocking member, which greatly improves the effect of preventing children from accidentally unlocking. For children with a young age and limited observation ability, it is difficult to complete the two steps simultaneously, thus greatly reducing the possibility of their successful unlocking.

[0037] In addition, as Figure 6 、 Figure 8 、 Figure 9 、 Figure 12 andFigure 14 As shown, an upper rotating shaft 21 is provided at the upper corner point of the door leaf 2 away from the switch housing 3. An articulated seat 22 is provided on the vertical column of the door frame 1 adjacent to the upper rotating shaft 21. The upper rotating shaft cooperates with the articulated seat 22 on the adjacent vertical column of the door frame. An upper shaft seat 20 is provided on the articulated seat 22, which extends upward in a tubular shape and can rotatably receive the upper rotating shaft 21. A lower rotating shaft 25 is provided at the lower corner point of the door leaf 2 corresponding to the lower part of the upper rotating shaft 21. The lower rotating shaft 25 is movably inserted into the bottom cross beam of the door frame 1. At the top of the upper shaft seat 20, a downwardly concave "V"-shaped groove 23 is symmetrically provided. A triangular block 24 with a tip protruding downward and capable of being inserted into the corresponding "V"-shaped groove 23 is provided around the circumference of the upper rotating shaft 21. The triangular block 24 can be inserted into the corresponding "V"-shaped groove 23. When the door leaf 2 is opened by no more than 90 degrees, the hypotenuse of the triangular block 24 and the hypotenuse of the "V"-shaped groove 23 are pressed against each other to realize the automatic closing function of the door leaf 2. A positioning groove 29 is provided at the top of the upper shaft seat 20, which is downwardly concave and can accommodate the tip of the triangular block 24 to be embedded. The positioning groove 29 and the "V"-shaped groove 23 are in a cross shape and are distributed on the peripheral edge of the top of the upper shaft seat 20. When the door leaf is opened to 90 degrees, the triangular block 24 and the positioning groove 29 are engaged with each other, ensuring that the door leaf 2 can be automatically fixed when opened to 90 degrees, so that the door leaf 2 remains in a fully open state, which is convenient for the needs of frequent entry and exit in a short time. To ensure the smooth closing of the door leaf 2, a spring groove 26 coaxial with and communicating with the inner cavity of the upper shaft seat 20 is provided at the bottom of the articulated seat 22. The diameter of the spring groove 26 is larger than the diameter of the inner cavity of the upper shaft seat 20, and the bottom penetrates the bottom surface of the articulated seat 22. The bottom end of the upper rotating shaft 21 extends downward into the spring groove 26. A spring base 27 is installed at the bottom end of the upper rotating shaft 21 by screws. The spring base 27 is in a disc shape, and the outer edge of its circumference can close the bottom opening of the spring groove 26. A top push spring 28 capable of sleeving on the bottom end of the upper rotating shaft 21 is provided between the spring base 27 and the inner wall of the top of the spring groove 26. The top push spring 28 provides an additional closing force to ensure that the door leaf 2 closes more smoothly.

[0038] In addition, as Figures 3 to 7 and Figure 10 and Figure 13As shown in the figure, a locking tongue groove 31 is provided in the switch housing 3. The locking tongue 4 is horizontally slidably arranged in the locking tongue groove 31. A locking tongue hole 30 is provided at the front end of the locking tongue groove 31, which can accommodate the front end of the locking tongue 4 to extend out and then insert into the locking buckle 11. An extrusion inclined surface 41 is provided at the top of the locking tongue 4. An upper key slot 32 that can penetrate the top surface of the switch housing 3 and is connected to the lower locking tongue groove 31, and a lower key slot 33 that can penetrate the bottom of the switch housing 3 and is connected to the upper locking tongue groove 31 are respectively provided in the switch housing 3 above and below the locking tongue groove 31. The upper unlocking member 6 includes a pressing plate 60 with one end hinged in the upper key slot 32. A push rod 61 extends downward from the bottom of the pressing plate 60. The end of the push rod 61 is in a sliding abutment with the extrusion inclined surface 41 in a manner that can cooperate with the extrusion inclined surface 41. When the upper unlocking member is pressed, the bottom end of its push rod 61 contacts the extrusion inclined surface, pushing the locking tongue to retract. In order to prevent the end of the pressing plate 60 away from the hinged side from disengaging from the upper key slot 32, a first hook 62 that can be stuck on the inner edge of the top opening of the upper key slot 32 is provided at the end of the pressing plate 60 away from the hinged side. The tail of the locking tongue 4 and the tail of the locking tongue groove 31 are pressed by a first reset member 43, so as to keep the front end of the locking tongue 4 extending out of the locking tongue hole 30, and at the same time ensure that the locking tongue can be reset in time after unlocking. The lower unlocking member 7 is installed in the lower key slot 33 in a vertically movable manner. Second hooks 73 that can prevent the lower unlocking member 7 from disengaging from the lower key slot 33 are respectively provided at the front and rear ends of the lower unlocking member 7. Vertical strip-shaped grooves 34 are respectively provided on the front and rear inner side walls of the lower key slot 33. The two second hooks 73 are respectively stuck in the strip-shaped grooves 34 and can move up and down synchronously along the strip-shaped grooves 34 as the lower unlocking member 7 moves up and down.

[0039] As a further preferred embodiment, the upper lock tongue 4 in this embodiment includes an upper lock tongue shell 40, and a telescopic groove 44 is provided in the upper lock tongue shell 40. The front end of the telescopic groove 44 passes through the front side of the upper lock tongue shell 40, and a lock bolt 45 that can slide back and forth in the telescopic groove 44 is provided in the telescopic groove 44. A fourth reset member 46 is pressed between the tail of the lock bolt 45 and the inner wall of the tail of the telescopic groove 44. The front end of the lock bolt 45 is round-headed. When the door leaf 2 is closed, the left and right sides of the upper lock buckle 11 that contact the lock bolt 45 are inclined. In this way, the lock bolt 45 can be pushed back into the telescopic groove 44 at the moment when the lock bolt 45 collides with the upper lock buckle 11. In order to prevent the lock bolt 45 from falling out of the telescopic slot 44, an anti-slip groove 47 is provided on the top of the telescopic slot 44, and an anti-slip block 48 is provided on the top of the lock bolt 45, which can be inserted into the anti-slip groove 47 and move back and forth in the anti-slip groove 47. Extrusion grooves 49 are respectively provided on the left and right outer walls of the upper lock tongue shell 40, and the extrusion slope 41 is arranged on the wall surface of the extrusion groove 49 facing the rear side, and the first reset member 43 is arranged at the center of the rear side wall surface of the upper lock tongue shell 40.

[0040] It should be emphasized that the two-way lock structure 8 includes a give-way groove 42 arranged on the outer wall of at least one side of the upper lock tongue 4. In this embodiment, the give-way groove 42 is respectively arranged on the left and right outer walls of the upper lock tongue shell 40 behind the extrusion groove 49, and the opening of the give-way groove 42 extends backward to the tail of the upper lock tongue shell 40. The lower unlocking member 7 is provided with a push rod 71 corresponding to the give-way groove 42 and capable of abutting against the tail of the upper lock tongue 4. In the initial state, the push rod 71 is against the tail end of the upper lock tongue shell 40 and is located below the opening of the give-way groove 42. At this time, since the tail end of the upper lock tongue shell 40 is supported by the push rod 71 and the pressure plate 60 is pressed, the upper lock tongue shell 40 cannot move backward. Therefore, only when the lower unlocking member 7 moves upward along the lower key slot 33 and the push rod 71 is aligned with the opening of the clearance slot 42, the upper lock tongue 4 is pressed back by the push rod 61, and the push rod 71 can be inserted into the clearance slot 42, so that the upper lock tongue housing 40 can smoothly retreat under the action of the push rod 61, and the lock bolt 45 can be pulled out from the groove of the upper lock buckle 11 to achieve unlocking. A second reset member 72 is provided between the lower unlocking member 7 and the top of the lower key slot 33, which can be moved down and reset again after the lower unlocking member 7 moves up, ensuring that the initial state can be restored in time after the unlocking operation is completed.

[0041] In addition, a lower lock shell 51 having a cavity inside is provided at the lower corner point of the door leaf 2 on the non-hinged side, the lower lock tongue 5 is telescopically arranged in the inner cavity of the lower lock shell 51, the bottom of the lower lock shell 51 is provided with a lower lock tongue hole 52 connected to the inner cavity, a pull rope hole 53 is passed through the top of the lower lock shell 51, the connecting member 50 is a pull rope inserted in the door leaf 2, one end of the pull rope passes through the pull rope hole 53 and is fixed to the lower lock tongue 5, and the other end of the pull rope is fixed to the lower unlocking member 7, and a third reset member 54 that can keep the lower lock tongue 5 extending out of the lower lock tongue hole 52 and inserted into the corresponding lower lock buckle 12 below is provided in the inner cavity between the lower lock tongue 5 and the top of the lower lock shell 51. By designing that the pull rope is connected to the lower unlocking member 7, when unlocking, the user can pull the lower lock tongue 5 back by pressing the lower unlocking member 7, completing the unlocking operation of the lower lock tongue 5. When the door leaf 2 is closed, in order to allow the lower lock tongue 5 to be smoothly inserted into the lower lock buckle 12 when it collides with the lower lock buckle 12, the front and rear corners of the bottom end of the lower lock tongue 5 are rounded, and the surface where the lower lock buckle 12 contacts the lower lock tongue 5 is set to an inclined surface.

[0042] In this practical example, the first restoring member 43 , the second restoring member 72 , and the third restoring member 54 are all springs as examples.

[0043] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments. The above embodiments and the description are only to illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A double-locked safety door barrier, comprising a "U"-shaped door frame (1) and a door leaf (2) hinged inside the door frame (1) and capable of being opened or closed back and forth, characterized in that: A switch housing (3) is provided at an upper corner point of a non-hinged side of the door leaf (2); an upper lock tongue (4) and a lower lock tongue (5) are telescopically provided in the switch housing (3) and at the bottom of the door leaf (2); an upper lock buckle (11) and a lower lock buckle (12) respectively cooperating with the upper lock tongue (4) and the lower lock tongue (5) are provided on the door frame (1); an upper unlocking member (6) capable of driving the upper lock tongue (4) to retract from the upper lock buckle (11) and a lower unlocking member (7) capable of driving the lower lock tongue (5) to retract from the lower lock buckle (12) are provided on the switch housing (3); the lower unlocking member (7) is connected to the lower lock tongue (5) via a connecting member (50) and is provided with a two-way lock structure (8) in which the upper unlocking member (6) can be pressed to drive the upper lock tongue (4) to retract only after the lower unlocking member (7) is pressed.

2. The double-locked safety door barrier according to claim 1, wherein, An upper lock tongue groove (31) is provided in the switch housing (3), and the upper lock tongue (4) is slidably arranged in the upper lock tongue groove (31) in a transverse manner. An upper lock tongue hole (30) is provided at the front end of the upper lock tongue groove (31) so as to allow the front end of the upper lock tongue (4) to extend out and be inserted into the upper lock buckle (11). An extrusion inclined surface (41) is provided at the top of the upper lock tongue (4). The switch housing (3) is provided with an upper and lower portion of the upper lock tongue groove (31) which can penetrate the top surface of the switch housing (3) and are respectively connected to the lower portion of the upper lock tongue groove (31). The upper key slot (32) is connected to the upper lock tongue slot (31) and the lower key slot (33) can penetrate the bottom of the switch housing (3) and is connected to the upper lock tongue slot (31). The upper unlocking member (6) includes a pressing plate (60) with one end hinged in the upper key slot (32). A push rod (61) extends downward from the bottom of the pressing plate (60). The end of the push rod (61) is slidably abutted against the extrusion inclined surface (41). The lower unlocking member (7) is movably mounted in the lower key slot (33) up and down.

3. The double-locked safety railing according to claim 2, characterized in that, The two-way lock structure (8) comprises a clearance groove (42) provided on at least one side outer wall of the upper lock tongue (4), the opening of the clearance groove (42) extending to the rear end of the upper lock tongue (4), and a push rod (71) corresponding to the clearance groove (42) and capable of abutting against the rear end of the upper lock tongue (4) is provided on the lower unlocking member (7), when the lower unlocking member (7) moves upward along the lower key groove (33) and the push rod (71) is aligned with the opening of the clearance groove (42), the upper lock tongue (4) is pressed back by the push rod (61), and the push rod (71) can be inserted into the clearance groove (42).

4. The double-locked safety door bar according to claim 3, characterized in that, A first reset member (43) is pressed between the tail of the upper lock tongue (4) and the tail of the upper lock tongue groove (31) and is capable of keeping the front end of the upper lock tongue (4) extending out of the upper lock tongue hole (30). A second reset member (72) is provided between the lower unlocking member (7) and the top of the lower key groove (33) and is capable of being moved downward again to reset after the lower unlocking member (7) moves upward.

5. A double-locked safety railing according to claim 4, characterized in that, A lower lock shell (51) having a cavity therein is provided at a lower corner point of the door leaf (2) on the non-hinged side; the lower lock tongue (5) is telescopically arranged in the inner cavity of the lower lock shell (51); a lower lock tongue hole (52) communicating with the inner cavity is provided at the bottom of the lower lock shell (51); a pull rope hole (53) is passed through the top of the lower lock shell (51); the connecting member (50) is a pull rope passed through the door leaf (2); one end of the pull rope passes through the pull rope hole (53) and is fixed to the lower lock tongue (5); the other end of the pull rope is fixed to the lower unlocking member (7); a third reset member (54) capable of keeping the lower lock tongue (5) extending out of the lower lock tongue hole (52) and inserted into the corresponding lower lock buckle (12) below is provided in the inner cavity between the lower lock tongue (5) and the top of the lower lock shell (51).

6. A double-locked safety railing according to any one of claims 1 to 5, characterized in that, An upper rotating shaft (21) is provided at an upper corner point of the door leaf (2) away from the switch housing (3); a hinge seat (22) is provided on a door frame (1) column adjacent to the upper rotating shaft (21); an upper shaft seat (20) is provided on the hinge seat (22) and extends upward in a tubular shape and can accommodate the upper rotating shaft (21) to be rotatably inserted; a lower rotating shaft (25) is provided at a lower corner point of the door leaf (2) below the corresponding upper rotating shaft (21); the lower rotating shaft (25) is movably plugged into the bottom crossbeam of the door frame (1); a "V"-shaped groove (23) in a downward concave shape is symmetrically provided on the top of the upper shaft seat (20); and a triangular block (24) with a tip protruding downward and capable of being inserted into the corresponding "V"-shaped groove (23) is provided outside the circumference of the upper rotating shaft (21).

7. A double-locked safety railing according to claim 6, characterized in that, A positioning groove (29) is provided on the top of the upper shaft seat (20) and is recessed downwards to accommodate the tip of the triangular block (24) to be embedded therein. The positioning groove (29) and the "V"-shaped groove (23) are arranged in a cross shape and are distributed on the top periphery of the upper shaft seat (20).

8. A double-locked safety railing according to claim 6, characterized in that, The bottom of the hinge seat (22) is provided with a spring groove (26) which is coaxial with the inner cavity of the upper shaft seat (20) and is interconnected. The diameter of the spring groove (26) is larger than the diameter of the inner cavity of the upper shaft seat (20), and the bottom passes through the bottom surface of the hinge seat (22). The bottom end of the upper rotating shaft (21) extends downward into the spring groove (26). A spring base (27) whose outer edge can close the bottom opening of the spring groove (26) is installed at the bottom end of the upper rotating shaft (21) by screws. A push spring (28) that can be sleeved on the bottom end of the upper rotating shaft (21) is provided between the spring base (27) and the top inner wall of the spring groove (26).

9. A double-locked safety railing according to claim 2, characterized in that, The end of the pressing plate (60) away from the hinged side is provided with a first hook (62) capable of being clamped on the inner edge of the top opening of the upper key slot (32), and the first hook (62) can prevent the end of the pressing plate (60) away from the hinged side from being separated from the upper key slot (32), and the front and rear ends of the lower unlocking member (7) are respectively provided with second hooks (73) capable of preventing the lower unlocking member (7) from being separated from the lower key slot (33).

10. A double-locked safety railing according to claim 4, characterized in that, The upper lock tongue (4) comprises an upper lock tongue shell (40), a telescopic groove (44) is provided in the upper lock tongue shell (40), the front end of the telescopic groove (44) passes through the front side of the upper lock tongue shell (40), a lock bolt (45) is provided in the telescopic groove (44) and can slide back and forth in the telescopic groove (44), a fourth reset member (46) is pressed between the rear end of the lock bolt (45) and the inner wall of the rear end of the telescopic groove (44), an anti-slip groove (47) is provided at the top of the telescopic groove (44), and a locking member (45) is provided at the top of the lock bolt (45). An anti-slip block (48) is provided which can be inserted into the anti-slip groove (47) and move forward and backward in the anti-slip groove (47); extrusion grooves (49) are respectively provided on the left and right outer walls of the upper locking tongue shell (40); the extrusion inclined surface (41) is provided on the wall surface of the extrusion groove (49) facing the rear side; the yielding grooves (42) are respectively provided on the left and right outer walls of the upper locking tongue shell (40) behind the extrusion groove (49); and the first reset member (43) is provided at the center of the rear side wall surface of the upper locking tongue shell (40).

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