A locking device capable of maintaining a door open angle

Abstract

The application discloses a locking device capable of keeping a door open at a certain angle, comprising a first rod and a second rod which are rotatably connected with each other, the free ends of the first rod and the second rod are connected with a door leaf and a door frame respectively, the first rod is provided with a linkage rod which is capable of sliding along the first rod, and a clamping structure which comprises a first blocking piece capable of blocking the linkage rod from moving away from the second rod, and a power structure capable of releasing and locking the first blocking piece; the second rod is provided with a pushing piece which is capable of pushing the linkage rod to slide when the second rod is rotated, and the pushing piece is provided with at least one locking position. When the second rod and the first rod reach a certain angle, a sensing piece sends a signal to drive the first blocking piece to block the linkage rod from moving away from the second rod, so as to lock the linkage rod, and then the door frame and the door leaf are relatively fixed and kept open at a certain angle.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of home decoration equipment, in particular to a locking device capable of keeping the door open at an angle. BACKGROUND

[0002] The door closer is a spring-like hydraulic device arranged on the door head, which can automatically close the door to the initial position after being compressed and released when the door is opened.

[0003] The utility model discloses a novel semi-automatic door closer, including door body fixed plate, the upper side of door body fixed plate is equipped with gear fixed plate, is equipped with support column between door body fixed plate and gear fixed plate, the upper side of gear fixed plate is fixed with hydraulic door closer fixed plate, and hydraulic door closer fixed plate is fixed with hydraulic door closer, the gear assembly that cooperates with hydraulic door closer is also equipped between door body fixed plate and gear fixed plate.

[0004] The common automatic door closer represented by the above technical solution can only support the automatic closing of the opened door panel. However, in daily use, it is often necessary to keep the door open for a long time and then restore the automatic closing use scenario, such as moving / house decoration of the first floor door of a unit building, and daily goods transportation of a commercial building. The existing method basically uses bricks, stones or other objects to block the door panel to solve the problem. The existing door closer cannot meet such demand.

[0005] Therefore, a device capable of keeping the door open at an angle is needed. Further, a device capable of automatically locking when the door is opened to a certain angle, keeping the door open at a certain angle, is needed. Further, an angle locking device capable of automatically releasing the locking state of the door in case of fire is needed. SUMMARY

[0006] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a device capable of keeping the door open at an angle. Further, a device capable of automatically locking when the door is opened to a certain angle, keeping the door open at a certain angle, is needed. Further, an angle locking device capable of automatically releasing the locking state of the door in case of fire is needed.

[0007] The technical scheme adopted by the present application to solve its technical problems is:

[0008] A locking device capable of keeping a door open at a certain angle, comprising a first lever and a second lever connected with each other in a rotatable manner, one of the free ends of the first lever and the second lever is connected with a door leaf, and the other is connected with a door frame,

[0009] The first lever is provided with:

[0010] A linkage lever capable of sliding along the first lever;

[0011] A detent structure comprising a first blocking piece capable of blocking the linkage lever from moving away from the second lever, and a power structure capable of releasing and locking the first blocking piece;

[0012] The second lever is provided with:

[0013] A pushing piece capable of pushing the linkage lever to slide when the second lever is rotated, the pushing piece is provided with at least one locking position.

[0014] Specifically, the power structure in the product is an electromagnet, but other power sources capable of receiving signals to generate power are also applicable.

[0015] By adopting the above scheme, the linkage lever and the second lever are connected in transmission through the pushing piece, when the second lever and the first lever reach a certain angle, the inductor sends a signal to the power structure to drive the first blocking piece to block the linkage lever from moving away from the second lever, thereby locking the linkage lever, the relative positions of the first lever and the linkage lever are fixed, and the relative positions of the second lever and the linkage lever are fixed, so that the first lever and the second lever are relatively fixed, and then the door frame and the door leaf are relatively fixed and maintained in an open state at a certain angle.

[0016] As an improved scheme, the pushing piece is a limiting wheel, the limiting wheel is fixedly connected with the second lever, and the side surface of the limiting wheel abuts against the linkage lever; the limiting wheel is provided with a rotating shaft, and the linkage lever is driven to change between the first position, the second position and the third position through the change of the distance from the side surface of the limiting wheel to the rotating shaft when the limiting wheel rotates.

[0017] Specifically, the limiting wheel and the second lever are detachably connected, and the automatic locking angle of the door can be changed by adjusting the relative angle of the limiting wheel and the second lever.

[0018] The structure of the limiting wheel and the second lever which can be detachably connected and adjusted in angle and then fixedly locked can be provided with a plurality of insertion slots and a corresponding insertion pin on the mutual contact surface of the limiting wheel and the second lever, or a ratchet wheel can be provided on the mutual contact surface of the limiting wheel and the second lever.

[0019] Specifically, the side edge of the limiting wheel is divided into at least three regions according to the distance from the side edge to the rotation axis, and the distance from the side edge to the rotation axis is compared, that is, the first region < the second region < the third region, and there are connecting regions with continuous distance changes between the three regions. The linkage lever is pressed against the side edge of the limiting wheel due to the action of the return spring or other types of elastic members. When the linkage lever abuts against the first region, the linkage lever is in the first position; when the linkage lever abuts against the second region, the linkage lever is in the second position; and when the linkage lever abuts against the third region, the linkage lever is in the third position. Taking the simplest scheme as an example, the distribution of the three regions on the side edge of the limiting wheel is: the layout of the first region-third region-second region-third region-first region, and the first regions at the head and tail are the same region. Such a layout is a relatively simple and reliable layout that can achieve the effect of automatically locking when the door is opened to a certain angle and maintaining the door at a certain angle. If necessary, it can also be changed to a more simple layout: first region-third region-second region-first region. This layout can achieve the effect of blocking the door leaf from closing below a certain angle when the door is opened to a certain angle, but the opening angle of the door can be arbitrarily enlarged. Since the door leaf is generally limited by the wall outside the door frame, the door leaf cannot be opened to an angle greater than 180 degrees, and the door leaf can only be moved between a certain angle and 180 degrees. Therefore, the door can also achieve the effect of automatically maintaining the opening angle of the door to be greater than a certain angle.

[0020] As an improved scheme, the first rod is provided with a first rotation shaft, the first blocking member is rotationally arranged around the first rotation shaft, the power structure is in transmission connection with the first blocking member, and the first blocking member is released or locked from the linkage lever by controlling the rotation of the first blocking member.

[0021] As an improved scheme, the force arm of the interaction force between the first blocking member and the linkage lever is smaller than the force arm of the interaction force between the first blocking member and the power structure.

[0022] By adopting the above scheme, since the force arm of the interaction force between the first blocking member and the linkage lever is smaller than the force arm of the interaction force between the first blocking member and the power structure, the power structure only needs a small force to obtain a torque equal to the interaction force between the linkage lever, which can improve the blocking effect on the linkage lever. In particular, when the force arm of the interaction force between the first blocking member and the linkage lever is 0, all the force for blocking the linkage lever is borne by the first rotation shaft, and the power structure only needs to bear the force for rotating the first blocking member, that is, the power structure only needs to output a small force to meet the use requirement.

[0023] As an improved scheme, the first blocking piece is provided with a blocking part matched with the linkage rod, and is also provided with a traction part in transmission connection with the power structure; the vertical distance from the straight line of the interaction force between the blocking part and the linkage rod to the first rotating shaft is the blocking force arm; the vertical distance from the straight line of the interaction force between the traction part and the power structure to the first rotating shaft is the traction force arm; the blocking force arm is smaller than the traction force arm.

[0024] By adopting the above scheme, since the blocking force arm is smaller, most of the force for blocking the linkage rod is borne by the first rotating shaft through the first blocking piece, and a small part is converted into the torque in the rotating direction of the first blocking piece around the first rotating shaft. At the same time, since the traction force arm is larger, only a small force needs to be used to obtain the torque in the opposite direction. As a result, the power structure can complete the blocking of the linkage rod by using a very small force compared with the thrust of the linkage rod.

[0025] As an improved scheme, the first rod is also provided with a second blocking piece and a second rotating shaft, the second blocking piece is arranged to rotate around the second rotating shaft, the second blocking piece releases or locks the rotation of the first blocking piece by rotating around the second rotating shaft, and the power structure is in transmission connection with the second blocking piece.

[0026] By adopting the above scheme, since the first rotating shaft bears most of the blocking force of the first rod, a small part is converted into the torque of the first blocking piece, and the second blocking piece with the same principle is added, which can bear most or even all of the torque of the first blocking piece by the second rotating shaft. Thus, the power structure can complete the blocking of the linkage rod by using a very small force, and the specific reason is that the blocking force of the linkage rod has been almost entirely borne by the first rotating shaft and the second rotating shaft through the first blocking piece and the second blocking piece, and the power structure only needs to be able to drive the second blocking piece to rotate.

[0027] As an improved scheme, a force relieving connection mechanism is arranged between the first blocking piece and the second blocking piece, the force relieving connection mechanism includes a force relieving guide rail and a force relieving sliding block slidingly arranged in the force relieving guide rail, the direction of the force relieving guide rail is inclined relative to the rotating direction of the first blocking piece, so that the first blocking piece abuts against the force relieving sliding block and applies a force perpendicular to the direction of the force relieving guide rail and a force parallel to the direction of the force relieving guide rail to the force relieving sliding block, the force relieving sliding block is provided with a limiting protrusion matched with the second blocking piece; the second blocking piece releases or locks the limiting protrusion by rotating around the second rotating shaft.

[0028] By adopting the above scheme, on the one hand, since the movement direction of the force relieving guide rail is opposite to the movement direction of the first blocking piece, the force of the force relieving sliding block against the first blocking piece can be divided into two directional components, a first component being perpendicular to the movement direction of the guide rail and being borne by the side wall of the force relieving guide rail, and a second component being transmitted to the movement direction of the guide rail by the blocking sliding block and being borne by the second blocking piece through the limiting protrusion. Thus, it can be seen that part of the moment of the first blocking piece is borne by the force relieving guide rail, so that the stress of the second blocking piece is reduced.

[0029] As an improved scheme, the first rod is provided with a high-temperature self-unlocking mechanism, the high-temperature self-unlocking mechanism comprises an emergency unlocking piece and a heat-sensitive trigger piece, the emergency unlocking piece can drive the first blocking piece or the second blocking piece to rotate to a position for releasing the locking of the linkage rod, and the heat-sensitive trigger piece is blocked between the emergency unlocking piece and the first blocking piece or the second blocking piece and can be released when the temperature rises.

[0030] By adopting the above scheme, the heat-sensitive trigger piece is blocked between the emergency unlocking piece and the first blocking piece or the second blocking piece in normal times, so that the high-temperature self-unlocking mechanism does not exert influence on the locking device itself and normally works. When a fire occurs, the high temperature generated by the fire causes the heat-sensitive trigger piece to fail, so that the emergency unlocking piece can push the first blocking piece or the second blocking piece to a position for releasing the blocking of the linkage rod and maintain the state. Thus, the locking device is automatically and forcibly unlocked in the fire, and the door panel is driven by the door closer to return to the door frame to close the door, thereby reducing the harm caused by the fire.

[0031] As an improved scheme, the heat-sensitive trigger piece is a temperature-sensing glass piece that can be broken by heat or a fusible alloy that can be melted by heat; and the emergency unlocking piece is a coil spring arranged on the first rod. According to actual structural needs, the coil spring can be arranged around the first rotation shaft or the second rotation shaft, one end of the coil spring is fixed to the first rod, and the other end of the coil spring is freely movable and moves in the direction of pushing the first blocking piece / second blocking piece without being blocked.

[0032] By adopting the above scheme, the use of the temperature-sensing glass piece has the advantages of no rusting and good long-term stability and reliability. The use of the fusible alloy has the advantages of easy production and reduced overall cost of the locking device.

[0033] As an improved scheme, the first rod is further provided with a position measuring device, the position measuring device is a Hall inductor arranged on the side of the linkage rod, and the linkage rod is provided with a magnetic ring or a magnetic inductive sheet matched with the Hall inductor. Alternatively, the position measuring device is a photoelectric inductor arranged on the side of the linkage rod, and the linkage rod is provided with a trigger piece matched with the photoelectric inductor.

[0034] By using the above scheme, the magnetic ring or the magnetic induction sheet can be sensed by the Hall inductor, so that the position of the linkage rod can be determined, and even the power structure can perceive the signal sent by the Hall inductor to automatically start to unlock or lock.

[0035] As an improved scheme, the power structure comprises a power source for driving the first blocking piece or the second blocking piece to rotate, and further comprises a rotating reset piece for resetting the first blocking piece or the second blocking piece in the state that the power source is not started.

[0036] As an improved scheme, the power source is an electromagnet, and the rotating reset piece is a reset spring.

[0037] As an improved scheme, the first rod piece and the second rod piece are respectively provided with matching sensing pieces and positioning pieces; the sensing pieces can sense the positioning pieces within a certain distance and send signals.

[0038] Specifically, the sensing pieces and the positioning pieces can be magnetic, photoelectric, infrared or other forms of sensing pieces and positioning pieces, and the purpose is to confirm that the door plate is in a completely closed state when the signal is sent, and the closing state of the door or the window can be remotely fed back.

[0039] Compared with the prior art, the present application has the following beneficial effects:

[0040] The linkage rod is in transmission connection with the second rod piece through the pushing piece, when the second rod piece and the first rod piece reach a specific angle, the sensing piece sends a signal to the power structure to drive the first blocking piece to block the linkage rod from moving away from the second rod piece, so as to lock the linkage rod, the relative position of the first rod piece and the linkage rod is fixed, and the relative position of the second rod piece and the linkage rod is fixed, so that the first rod piece and the second rod piece are relatively fixed, and the door frame and the door leaf are relatively fixed and maintained in an open state at a certain angle.

[0041] Further, during the opening process, when the linkage rod reaches the third position, the position measuring device sends a signal to control the clamping mechanism to block the next movement of the linkage rod from the second position to the third position, and when the linkage rod reaches the second position, it cannot reach the third position again due to the clamping mechanism and is stopped at the second position. At this time, the linkage rod is fixed relative to the first rod piece, the second rod piece is fixed relative to the first rod piece due to the influence of the linkage rod, and the door plate and the door frame are maintained in an open state at a certain angle, so as to realize the effect that when the door is opened to a certain angle, it is automatically locked and maintained at a certain angle.

[0042] Further, when the door is opened to a certain angle, the door is blocked from closing below the angle, but the opening angle of the door can be arbitrarily enlarged. Since the door is generally limited by the wall outside the door frame, the door cannot be opened more than 180 degrees. At this time, the door is limited to move between a certain angle and 180 degrees, and the effect of automatically maintaining the opening angle of the door greater than a certain angle can also be achieved.

[0043] Further, when the door is opened to a certain angle, the door is blocked from closing below the angle, but the opening angle of the door can be arbitrarily enlarged. Since the door is generally limited by the wall outside the door frame, the door cannot be opened more than 180 degrees. At this time, the door is limited to move between a certain angle and 180 degrees, and the effect of automatically maintaining the opening angle of the door greater than a certain angle can also be achieved.

[0044] Further, the vertical distance from the straight line of the interaction force between the traction part and the power structure to the first rotating shaft is the traction arm, and the blocking arm is smaller than the traction arm. Because the blocking arm is small, most of the force for blocking the linkage rod is borne by the first rotating shaft through the first blocking piece, and a small part is converted into the torque in the rotating direction of the first rotating shaft. At the same time, because the traction arm is large, only a small force is needed to obtain the same size torque in the opposite direction by using the first rotating shaft. As a result, the power structure only needs to use a small force compared to the linkage rod thrust to complete the blocking of the linkage rod.

[0045] Further, the power source stops after driving the clamping protruding part away from the clamping groove, and the first movable pin is further provided with a rotating reset piece. The rotating reset piece drives the clamping protruding part of the first movable pin to return to the original position. Because the second movable pin has been pushed to the first movable pin at this time, the end of the second movable pin close to the first movable pin is located on the side of the clamping protruding part facing the first movable pin. After the clamping protruding part is reset, it can block the movement of the second movable pin to the first movable pin, thereby maintaining the first movable pin on the moving path of the linkage rod protrusion in the third position direction. Unless the power source is started again to drive the clamping protruding part away from the current position, the linkage rod cannot move to the third position direction.

[0046] Further, the Hall sensor can accurately determine the timing of the linkage rod reaching the third position by sensing the magnetic force of the magnetic ring on the linkage rod and sending a signal to the power source.

[0047] Further, the electromagnet as the power source is energized to start when receiving the signal, drives the clamping protruding part of the first blocking piece away from the clamping groove, and is de-energized after a certain time after starting to release the driving of the first blocking piece. The clamping protruding part of the first blocking piece returns to the original position under the driving of the rotating reset piece.

[0048] Further, when a fire occurs, the high temperature affects the temperature-sensitive glass part, specifically, the temperature-sensitive glass part is broken under the high temperature effect, thereby removing the blocking of the coil spring, at this time, the coil spring drives the clamping protrusion of the first blocking part to leave the clamping groove and maintains this state, thereby causing the first blocking part to maintain the moving path in the direction from the second position to the third position, and finally removing the locking state of the door leaf and the door frame maintaining a certain angle. Thus, when a fire occurs when the door leaf and the door frame are locked at an angle, the locking of the door leaf and the door frame is automatically released to facilitate automatic door closing, thereby preventing further spread of the fire. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 It is a first embodiment of the locking device capable of maintaining the opening angle of the door.

[0050] Figure 2 It is a first embodiment of the locking device capable of maintaining the opening angle of the door.

[0051] Figure 3 It is a first embodiment of the locking device capable of maintaining the opening angle of the door.

[0052] Figure 4 It is a first embodiment of the locking device capable of maintaining the opening angle of the door.

[0053] Figure 5 It is a second embodiment of the locking device capable of maintaining the opening angle of the door.

[0054] Figure 6 It is a second embodiment of the locking device capable of maintaining the opening angle of the door.

[0055] Figure 7 It is a second embodiment of the locking device capable of maintaining the opening angle of the door.

[0056] Figure 8 It is a preferred structure of the locking device capable of maintaining the opening angle of the door.

[0057] Figure 9 It is a force arm analysis diagram of the first blocking part of the locking device capable of maintaining the opening angle of the door.

[0058] Wherein, 1: first rod; 2: second rod; 3: linkage rod; 4: position measuring device; 5: limit wheel; 6: rotating shaft; 7: first area; 8: second area; 9: third area; 10: return spring; 11: linkage rod protrusion; 12: first movable pin; 13: second movable pin; 14: first blocking piece; 15: transmission inclined surface; 16: clamping groove; 17: blocking power piece; 18: clamping protrusion; 19: first rotating shaft; 20: power source; 21: rotating return piece; 22: magnetic ring; 23: coil spring; 25: second rotating shaft; 26: blocking part; 27: traction part; 28: unloading guide rail; 29: unloading sliding block; 30: limit protrusion; 31: fusible alloy; 32: second blocking piece; 33: ball. DETAILED DESCRIPTION

[0059] The application will be further described in connection with the accompanying drawings and examples:

[0060] The application will be further described in connection with the accompanying drawings and examples:

[0061] Case 1:

[0062] As shown in the accompanying drawings, a locking device capable of keeping the door open angle, comprising a first rod 1 and a second rod 2 connected with each other in rotation, one of the free ends of the first rod 1 and the second rod 2 is connected with the door leaf, and the other is connected with the door frame, Figures 1-4 The first rod is provided with:

[0063] A linkage rod 3, which can slide along the first rod;

[0064] A clamping structure, which comprises a first blocking piece 14 capable of blocking the linkage rod 3 from moving away from the second rod, at least one sensing piece capable of detecting the position of the linkage rod 3, and a power structure capable of receiving the signal sent by the sensing piece and releasing and locking the first blocking piece 14;

[0065] The second rod is provided with:

[0066] A pushing piece which can push the linkage rod 3 to slide when the second rod is rotated, the pushing piece is provided with at least one locking position.

[0067] Specifically, the power structure in the product is an electromagnet, but other power sources capable of receiving signals to generate power are also applicable.

[0068]

[0069] ​The linkage rod 3 is in transmission connection with the second rod 2 through a pushing member. When the second rod 2 and the first rod 1 reach a specific angle, the inductive member sends a signal to the power structure to drive the first blocking member 14 to block the linkage rod 3 from moving away from the second rod, thereby locking the linkage rod 3. The relative positions of the first rod 1 and the linkage rod 3 are fixed, and the relative positions of the second rod 2 and the linkage rod 3 are fixed, so that the first rod 1 and the second rod 2 are relatively fixed, and the door frame and the door leaf are relatively fixed and maintained in an open state at a certain angle.

[0070] The pushing member is a limiting wheel 5, which is fixedly connected with the second rod 2 and abuts against the linkage rod 3 on the side surface. The limiting wheel 5 is provided with a rotating shaft 6. When the limiting wheel 5 rotates, the distance between the side surface and the rotating shaft 6 changes, thereby driving the linkage rod 3 to change between the first position, the second position and the third position.

[0071] Specifically, the limiting wheel 5 is detachably connected with the second rod 2. By adjusting the relative angle between the limiting wheel 5 and the second rod 2, the angle at which the door is automatically locked can be changed.

[0072] The structure for detachable and adjustable locking between the limiting wheel 5 and the second rod 2 can be a bolt and a plurality of slots matched with each other on the contact surface between the limiting wheel 5 and the second rod 2, or a ratchet wheel.

[0073] The first rod 1 is provided with a first rotating shaft 19. The first blocking member 14 is arranged to rotate around the first rotating shaft 19. The power structure is in transmission connection with the first blocking member 14, and controls the first blocking member 14 to release or lock the linkage rod 3 by rotating the first blocking member 14.

[0074] The force arm of the interaction force between the first blocking member 14 and the linkage rod 3 is smaller than the force arm of the interaction force between the first blocking member 14 and the power structure.

[0075] Since the force arm of the interaction force between the first blocking member 14 and the linkage rod 3 is smaller than the force arm of the interaction force between the first blocking member 14 and the power structure, the power structure only needs a small force to obtain a torque equal to the interaction force between the linkage rod 3, thereby improving the blocking effect on the linkage rod 3. In particular, when the force arm of the interaction force between the first blocking member 14 and the linkage rod 3 is 0, all the force for blocking the linkage rod 3 is borne by the first rotating shaft 19, and the power structure only needs to bear the force for rotating the first blocking member 14, that is, the power structure only needs to output a small force to meet the use requirement.

[0076] The first blocking piece 14 is provided with a blocking part 26 matched with the linkage rod 3, and a traction part 27 transmissionally connected with the power structure; the vertical distance from the straight line of the interaction force between the blocking part 26 and the linkage rod 3 to the first rotating shaft 19 is the blocking force arm; the vertical distance from the straight line of the interaction force between the traction part 27 and the power structure to the first rotating shaft 19 is the traction force arm; the blocking force arm is smaller than the traction force arm.

[0077] Since the blocking force arm is smaller, most of the force for blocking the linkage rod 3 is borne by the first rotating shaft 19 through the first blocking piece 14, and a small part is converted into the torque of the first blocking piece 14 rotating in the direction of the first rotating shaft 19. At the same time, since the traction force arm is larger, the traction of the first rotating shaft 19 only needs to use a small force to obtain a torque of the same size in the opposite direction. As a result, the power structure only needs to use a very small force compared with the thrust of the linkage rod 3 to complete the blocking of the linkage rod 3.

[0078] The first rod 1 is further provided with a second blocking piece 32 and a second rotating shaft 25, the second blocking piece 32 is rotationally arranged around the second rotating shaft 25, the second blocking piece 32 releases or locks the rotation of the first blocking piece 14 by rotating around the second rotating shaft 25, and the power structure is transmissionally connected with the second blocking piece 32.

[0079] Since the first rotating shaft 19 bears most of the blocking force of the first rod 1, and a small part is converted into the torque of the first blocking piece 14, the second blocking piece 32 with the same principle is added, which can bear most or even all of the torque of the first blocking piece 14 by the second rotating shaft 25. Thus, the power structure only needs very small force to complete the blocking of the linkage rod 3, and the specific reason is that the blocking force of the linkage rod 3 has been almost entirely borne by the first rotating shaft 19 and the second rotating shaft 25 through the first blocking piece 14 and the second blocking piece 32, and the power structure only needs to be able to drive the second blocking piece 32 to rotate.

[0080] A force relieving connecting mechanism is arranged between the first blocking piece 14 and the second blocking piece 32, the force relieving connecting mechanism comprises a force relieving guide rail 28 and a force relieving sliding block 29 slidingly arranged in the force relieving guide rail 28, the direction of the force relieving guide rail 28 is inclined relative to the rotating direction of the first blocking piece 14, and the force relieving sliding block 29 is provided with a limiting protrusion 30 matched with the second blocking piece 32; the second blocking piece 32 releases or locks the limiting protrusion 30 by rotating around the second rotating shaft 25.

[0081] In one aspect, since the movement direction of the force relieving guide rail 28 is opposite to the movement direction of the first blocking piece 14, the force of the force relieving sliding block 29 against the first blocking piece 14 can be divided into two directional components, the first component being perpendicular to the movement direction of the guide rail and being borne by the side wall of the force relieving guide rail 28 itself, and the second component being transmitted to the movement direction of the guide rail through the blocking sliding block and being borne by the second blocking piece 32 via the limiting protrusion 30. Thus, part of the moment of the first blocking piece 14 is borne by the force relieving guide rail 28, so that the force borne by the second blocking piece 32 is reduced.

[0082] The first rod 1 is provided with a high-temperature self-unlocking mechanism, which comprises an emergency unlocking piece and a heat-sensitive triggering piece. The emergency unlocking piece can drive the first blocking piece 14 or the second blocking piece 32 to rotate to a position where the locking of the linkage rod 3 is released. The heat-sensitive triggering piece is blocked between the emergency unlocking piece and the first blocking piece 14 or the second blocking piece 32 and can be released when the temperature rises.

[0083] In normal times, the heat-sensitive triggering piece is blocked between the emergency unlocking piece and the first blocking piece 14 or the second blocking piece 32, so that the high-temperature self-unlocking mechanism does not exert an influence on the locking device itself and the locking device works normally. When a fire occurs, the high temperature generated by the fire causes the heat-sensitive triggering piece to fail, so that the emergency unlocking piece can push the first blocking piece 14 or the second blocking piece 32 to a position where the linkage rod 3 is not blocked and maintain the state. Thus, the locking device is automatically and forcibly unlocked when a fire occurs, and the door panel is driven by the door closer to return to the door frame to close the door, thereby reducing the harm caused by the fire.

[0084] The heat-sensitive triggering piece is a fusible alloy 31 that melts by itself when heated. The emergency unlocking piece is a coil spring 23 arranged on the first rod 1. The coil spring 23 is arranged around a second rotating shaft 25, one end of which is fixed to the first rod 1 and the other end of which is freely movable and moves in the direction of pushing the first blocking piece 14 / second blocking piece 32 when not blocked.

[0085] The use of the fusible alloy 31 has the advantage of easy production and reduces the overall cost of the locking device.

[0086] The heat-sensitive triggering piece can also be replaced by a temperature-sensing glass piece, which has the effect of bursting by itself when heated.

[0087] The first rod 1 is also provided with a position measuring device 4, which is a Hall inductor arranged on the side facing the linkage rod 3. The linkage rod 3 is provided with a magnetic ring 22 or a magnetic sensing sheet matching the Hall inductor.

[0088] The Hall inductor can sense the magnetic ring 22 or the magnetic sensing sheet, thereby determining the position of the linkage rod 3, and even a power structure can perceive the signal emitted by the Hall inductor to automatically start to automatically unlock or lock.

[0089] Implementation Case 2:

[0090] As attached Figures 5-7 As shown, a locking device that can maintain the opening angle of a door differs from Embodiment 1 in that there is no unloading guide rail 28 and unloading slider 29 between the second blocking member 32 and the first blocking member 14, and the traction part 27 of the first blocking member 14 is directly blocked by the second blocking member 32.

[0091] In this way, the resistance to the linkage rod 3 is mainly borne by the first rotating shaft 19 and the second rotating shaft 25, and the structure is relatively simple and reliable.

[0092] The working principle of the mutual transmission connection between the linkage rod 3 and the limiting wheel 5 is as follows:

[0093] like Figure 3 and 6 As shown, the linkage rod 3, driven by the return spring 10, maintains a state of contact and pressure against the side of the limit wheel 5. When the limit wheel 5 rotates, the linkage rod 3 moves up and down according to the change in distance from the side of the limit wheel 5 to the rotation axis 6, changing between the first position, the second position, and the third position. Figure 4 and 5 The linkage rod 3 is located in the second position. As shown in the figure, since the distance from the side to the rotation axis 6 increases regardless of whether the limit wheel 5 rotates clockwise or counterclockwise, the limit wheel 5 will be locked and unable to rotate as long as the locking linkage rod 3 cannot move downward.

[0094] Similarly, if the distance from the side of the limit wheel 5 to the rotation axis 6 increases when the limit wheel 5 is rotating in one direction, the limit wheel 5 will be prevented from rotating in one direction when the locking linkage rod 3 cannot move downward.

[0095] Since the limiting wheel 5 is fixedly connected to the second rod 2, when the limiting wheel 5 is prevented from rotating in one direction or in two directions relative to the first rod 1, the second rod 2 will also be prevented from rotating in one direction or in two directions relative to the first rod 1.

[0096] The preferred shape and distribution of the limiting wheel 5 are shown in the attached figure. Figure 9 As shown:

[0097] On the side of the limiting wheel 5, there is mostly a continuous first area 7. Each end of the first area 7 is connected to a third area 9, and a second area 8 is sandwiched between the two third areas 9.

[0098] The working principle of the interaction between the first blocking member 14 and the linkage rod 3 is as follows:

[0099] like Figure 4As shown in Figure 7, the linkage 3 can slide in the upper left-lower right direction on the first member 1. The first blocking member 14 is located at the lower left of the movement path of the linkage 3, and rotates around the first rotating shaft 19 located at the lower left of the movement path of the linkage 3. Specifically, the axis of the first rotating shaft 19 is as close as possible to the movement path of the linkage 3, thereby reducing the lever arm that blocks the linkage 3, so that as much blocking force as possible can be borne by the first rotating shaft 19. The first blocking member 14 is provided with a blocking part 26 that interacts with the linkage 3 and a traction part 27 that interacts with the second member 2 / unloading connection mechanism. Specifically, the blocking part 26 is closer to the first rotating shaft 19 than the traction part 27, so that the resistance lever arm of the blocking part 26 on the linkage 3 is smaller, and the resistance lever arm of the second member 2 / unloading connection mechanism on the traction part 27 is larger. Preferably, the blocking part 26 is specially shaped so that the straight line of resistance to the linkage rod 3 is closer to the first rotating shaft 19. The traction part 27 is shaped so that the resistance of the second rod 2 / unloading connection mechanism to the traction part 27 is as perpendicular as possible to the line connecting the traction part 27 to the first rotating shaft 19. This makes the lever arm of this resistance as large as possible, that is, makes the length of the lever arm as equal as possible to the distance from the traction part 27 to the first rotating shaft 19.

[0100] The working principle of the interaction between the first blocking member 14 and the second blocking member 32 is as follows:

[0101] like Figure 6 and 7 As shown, the first blocking member 14 is generally L-shaped, with the first rotating shaft 19 at the top of the L, the blocking part 26 in the middle of the L, and the traction part 27 at the lower right end of the L. The traction part 27 has a protrusion extending vertically upwards. The second blocking member 32 is disposed on the upper layer of the first blocking member 14, including a rotating end on the right side that is rotatably connected to the second rotating shaft 25, a free end on the left side that is connected to the power source 20 (i.e., the electromagnet), and a snap-fit ​​structure in the middle section that matches the vertical protrusion of the traction part 27. The power source 20 has a rotation reset member 21 (i.e., a reset spring 10). Normally, the second blocking member 32 is maintained in a slightly upper position by the action of the reset spring 10. The snap-fit ​​structure is located on the moving path of the traction part 27 to the left, blocking the traction part 27 from moving to the left. Since the second rotating shaft 25 is on the moving path of the traction part 27, most of the resistance to the movement of the traction part 27 is borne by the second rotating shaft 25. Therefore, the power source 20 only needs a small force to pull the second blocking member 32 to rotate counterclockwise around the second rotating shaft 25, causing the locking structure to disengage from the path of the traction part 27 to move to the left, so that the first blocking member 14 can be unlocked and rotate freely.

[0102] The working principle of the interaction between the first blocking member 14 and the force-relieving connection mechanism is as follows:

[0103] like Figure 4As shown, the traction part 27 of the first blocking piece 14 is connected to the force relief connecting mechanism. Specifically, the force relief connecting mechanism comprises a force relief guide rail 28 and two force relief sliders 29, wherein the force relief slider 29 connected to the traction part 27 is cylindrical, and the other force relief slider 29 interacting with the second blocking piece 32 is hollow square column type, and the right side of the square column type force relief slider 29 has a spring for resetting. When the traction part 27 abuts against the cylindrical force relief slider 29, the resistance to the traction part 27 is divided into two parts of force; the first part of force is perpendicular to the side wall of the force relief guide rail 28, which is borne by the lower left side wall of the force relief guide rail 28, and since the force relief guide rail 28 is fixed on the first lever 1, it is ultimately borne by the first lever 1. The second part of force is the same as the direction of the force relief guide rail 28, which is transmitted to the square column type force relief slider 29 from the cylindrical force relief slider 29, and then to the second blocking piece 32.

[0104] The working principle of the second blocking piece 32 interacting with the force relief connecting mechanism is as follows:

[0105] As shown in Figure 3 and 4 , the right end of the square column type force relief slider 29 is provided with a protrusion extending upward in the vertical direction to the upper layer, which extends to the same height as the second blocking piece 32 and can be blocked by the second blocking piece 32. As shown in Figure 3 , the second blocking piece 32 is arranged on the upper layer of the square column type force relief slider 29 and rotates around the second rotating shaft 25, wherein a hook-shaped intercepting part matching the protrusion of the square column type force relief slider 29 is arranged right below the second rotating shaft 25, and preferably, the line connecting the hook-shaped intercepting part and the second rotating shaft 25 is on the same straight line as the movement path of the protrusion of the square column type force relief slider 29; a free end connected to the power source 20 is arranged right above the second rotating shaft 25. Normally, the second blocking piece 32 is reset by the rotating reset piece 21, and the hook-shaped intercepting part is blocked right below the protrusion of the square column type force relief slider 29, so that the square column type force relief slider 29 cannot move right below; when the power source 20 is started, the second blocking piece 32 is driven to rotate clockwise around the second rotating shaft 25, and the hook-shaped intercepting part moves left below to move away from the movement path of the protrusion of the square column type force relief slider 29, so that the square column type force relief slider 29 can move freely right below.

[0106] Preferably, the second blocking piece is provided with a hook-shaped intercepting part matching the limiting protrusion, when the limiting protrusion is inside the hook-shaped intercepting part, the limiting protrusion is blocked by the second blocking piece and cannot move away from the second lever, and the linkage lever cannot move away from the second lever; when the limiting protrusion is outside the hook-shaped intercepting part, the limiting protrusion is blocked by the outside of the hook-shaped intercepting part and cannot move close to the second lever, and the linkage lever can move away from or close to the linkage lever at will.

[0107] Specifically, since the electromagnet is energized to start and then reset due to the spring for reset after power failure, the hook-shaped intercepting part of the second rod member will first move away from the movement path of the limiting protrusion and quickly return to the movement path.

[0108] Therefore, the workflow is that the initial state is that the limiting protrusion is inside the hook-shaped intercepting part, and at this time the linkage rod is blocked from moving away from the second rod member. As shown in Figure 3 .

[0109] Then, the electromagnet is started for the first time, the hook-shaped intercepting part moves away from the movement path of the limiting protrusion, the limiting protrusion is moved to the outside of the hook-shaped intercepting part under the influence of the linkage rod, and at the same time the hook-shaped intercepting part is reset to the movement path of the limiting protrusion under the influence of the electromagnet, the limiting protrusion is intercepted outside the hook-shaped intercepting part, and at this time the linkage rod is in a completely free movement state without being blocked.

[0110] Until the next time the electromagnet is started, the hook-shaped intercepting part moves away from the movement path of the limiting protrusion, the limiting protrusion is moved to the initial state position, that is, inside the hook-shaped intercepting part, under the influence of the spring arranged in the unloading guide rail, and at the same time the hook-shaped intercepting part is reset to the movement path of the limiting protrusion under the influence of the electromagnet, and thus it returns to the initial state. At this time, the linkage rod is blocked from moving away from the second rod member. As shown in Figure 3 .

[0111] Optionally, the first blocking member 14 directly interacts with the power source 20, and the principle is as follows:

[0112] As shown in Figure 7 , the first rotating shaft is located on the left side of the movement path of the linkage rod, which is modified to be located directly above / below the movement path of the linkage rod, and the blocking part of the first blocking member is also arranged on the movement path of the linkage rod, so that the force arm of the linkage rod 3 is 0. The power source 20 is connected to the traction part of the first blocking member, and only drives the first blocking member to rotate. When the power source 20, that is, the electromagnet, is energized to start upon receiving a signal, it drives the first blocking member 14 to rotate clockwise / counterclockwise around the first rotating shaft, thereby making the blocking part away from the movement path of the linkage rod. And then power off, the first blocking member 14 is driven to rotate and reset around the first rotating shaft by the rotating reset member.

[0113] For example, the principle of the action between the force arm and the force is as follows: Figure 9

[0114] As shown in Figure 9 , the first blocking member rotates around the first rotating shaft, and its rotation can be regarded as a fulcrum along the O point in the figure, which is respectively affected by the first force F1 from the linkage rod and the second force F2 from the second blocking member.

[0115] ​According to force analysis, the first force F1 is horizontally right, acting on the blocking part of the first blocking member, and the dashed line is straight from the blocking part in the horizontal direction; a line segment is drawn from the point O in the figure, which is perpendicular to the dashed line and connects the dashed line, and the length of the line segment is the lever arm L1 of F1.

[0116] According to force analysis, the second force F2 is vertically upward, acting on the traction part of the first blocking member, and the dashed line is straight from the traction part in the vertical direction; a line segment is drawn from the point O in the figure, which is perpendicular to the dashed line and connects the dashed line, and the length of the line segment is the lever arm L2 of F2.

[0117] According to the law of physics, when the first blocking member stops rotating and maintains the interception linkage rod moving to the right, the first blocking member should be maintained stationary, at this time F1*L1=F2*L2 should be maintained to maintain force balance. As shown in Figure 9 Obviously, L1 is significantly smaller than L2, and L2 is at least 5 times larger than L1. Then to maintain the equality F1*L1=F2*L2, it is obvious that F1 is significantly larger than F2, that is, the second blocking member only needs to provide much smaller pressure to the first blocking member than the linkage rod provides to the first blocking member to maintain force balance and complete the blocking of the linkage rod.

[0118] In summary, after reading the present application document, those skilled in the art can make other various corresponding transformation schemes without creative mental labor according to the technical solutions and technical concepts of the present application, and different application scenarios all belong to the scope protected by the present application.

Claims

1. A locking device capable of keeping a door open at a certain angle, comprising a first lever (1) and a second lever (2) connected to each other in rotation, one of the free ends of the first lever (1) and the second lever (2) being connected to a door leaf and the other being connected to a door frame, characterized in that the first lever is provided with: a linkage lever (3) capable of sliding along the first lever; a detent structure comprising a first blocking piece (14) capable of blocking the linkage lever (3) from moving away from the second lever, and a power structure capable of releasing and locking the first blocking piece (14); the second lever is provided with: a pushing piece capable of pushing the linkage lever (3) to slide when the second lever is rotated, the pushing piece being provided with at least one locking position; wherein the first lever (1) is further provided with a first rotation shaft (19), and the first blocking piece (14) is rotationally arranged around the first rotation shaft (19); the first lever (1) is further provided with a second blocking piece (32); a force relieving connecting mechanism is arranged between the first blocking piece (14) and the second blocking piece (32), the force relieving connecting mechanism comprising a force relieving guide rail (28) and a force relieving sliding block (29) slidingly arranged in the force relieving guide rail (28), the first blocking piece (14) abutting against the force relieving sliding block (29) and applying a force perpendicular to the direction of the force relieving guide rail (28) and a force parallel to the direction of the force relieving guide rail (28) to the force relieving sliding block (29); the power structure is in transmission connection with the first blocking piece (14) and releases or locks the linkage lever (3) by controlling the rotation of the first blocking piece (14). the first lever (1) is further provided with a second rotation shaft (25), and the second blocking piece (32) is rotationally arranged around the second rotation shaft (25), the second blocking piece (32) releasing or locking the rotation of the first blocking piece (14) by rotating around the second rotation shaft (25), and the power structure is in transmission connection with the second blocking piece (32). the first lever (1) is provided with a high-temperature self-unlocking mechanism, the high-temperature self-unlocking mechanism comprising an emergency unlocking piece and a heat-sensitive triggering piece, the emergency unlocking piece being capable of driving the first blocking piece (14) or the second blocking piece (32) to rotate to a position where the linkage lever (3) is unlocked, and the heat-sensitive triggering piece being blocked between the emergency unlocking piece and the first blocking piece (14) or the second blocking piece (32) and being capable of being unblocked when the temperature rises. the heat-sensitive triggering piece is a temperature-sensitive glass piece that breaks by itself when heated or a fusible alloy (31) that melts by itself when heated; and the emergency unlocking piece is a coil spring (23) arranged on the first lever (1). ​ ​ ​ ​ ​ 2. The lock set according to claim 1, wherein the door opening angle is set to 90 degrees. ​ 3. The lock set according to claim 2, wherein the lock set is configured to allow the door to be opened to an angle of 90 degrees. ​ 4. The lockset capable of maintaining a door ajar angle according to claim 3, wherein, ​ 5. The lock device capable of maintaining a door opening angle according to any one of claims 1 to 4, wherein The first blocking piece (14) is provided with a blocking part (26) matched with the linkage rod (3) and a traction part (27) transmission connected with the power structure; the vertical distance from the straight line of the interaction force between the blocking part (26) and the linkage rod (3) to the first rotating shaft (19) is the blocking force arm; the vertical distance from the straight line of the interaction force between the traction part (27) and the power structure to the first rotating shaft (19) is the traction force arm; the blocking force arm is smaller than the traction force arm.

6. The lockset capable of maintaining a door ajar angle according to claim 2, wherein, The unloading slide block (29) is provided with a limiting protrusion (30) matched with the second blocking piece (32); the second blocking piece (32) releases or locks the limiting protrusion (30) by rotating around the second rotating shaft (25).

7. The lockset capable of maintaining a door ajar angle according to claim 1, wherein, The first rod (1) is further provided with a position measuring device (4), which is a Hall inductor or a photoelectric inductor arranged on the side facing the linkage rod (3); the linkage rod (3) is provided with a magnetic ring (22) matched with the Hall inductor or a magnetic induction sheet or a trigger matched with the photoelectric inductor.

8. The lockset capable of maintaining a door ajar angle according to claim 1, wherein, The power structure includes a power source driving the first blocking piece (14) or the second blocking piece (32) to rotate and a rotating reset member resetting the first blocking piece (14) or the second blocking piece (32) when the power source is not started.

9. The lockset capable of maintaining a door ajar angle according to claim 1, wherein, The first rod and the second rod are respectively provided with a sensing member and a positioning member matched with each other; the sensing member can sense the positioning member within a certain distance and send a signal.

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