Passive electronic locks

Abstract

The present invention discloses a passive electronic lock, comprising a lock body, a lock cylinder, a circuit board, an electromagnet, and a conductive shaft. The lock body is provided with a movable cavity for the lock cylinder to rotate with, and a rotation-stop mechanism is provided between the two. The lock cylinder is made of a conductive material, and its front surface is provided with a plug slot, and the plug slot is provided with a plug hole. A mounting cavity is provided between the front and rear ends of the lock cylinder. The circuit board and the electromagnet are both located in the mounting cavity and are electrically connected. The conductive shaft is located in the plug hole and is insulated from the lock cylinder, and is electrically connected to one electrode of the circuit board. The other electrode of the circuit board is electrically connected to the inner wall of the mounting cavity. The iron core of the electromagnet is arranged opposite to the rotation-stop mechanism. When the electromagnet is de-energized, the iron core acts on the rotation-stop mechanism to maintain the lock cylinder. When the electromagnet is energized, the iron core disengages the rotation-stop mechanism to release the lock cylinder. The present invention can further reduce the internal space of the lock, thereby achieving a smaller lock body size to meet the application needs of specific customers.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic locks, and in particular to a passive electronic lock. Background Art

[0002] With the development of society, locks have become more diversified. Mechanical locks pose security risks such as the easy loss and duplication of physical keys. Electronic locks, however, address these security risks by using electronic keys. However, if the key is leaked, the risk of theft still exists. Furthermore, electronic locks require batteries or electrical wiring for power. The former requires regular battery replacement and has numerous drawbacks, such as bulk, weight, and high cost. The latter becomes unusable if the power is lost, resulting in a poor user experience. Consequently, the industry has gradually developed passive locks.

[0003] A passive lock consists of a lock and a key. The lock itself does not have a power source, but is powered by an inserted key, which drives an electromagnetic structure inside the lock to open and close the lock. Existing passive locks primarily consist of a lock housing, a lock core, and an electromagnetic structure within the lock. Locking and unlocking are achieved by switching the electromagnetic structure on and off. The electromagnetic structure is typically placed alongside the lock core to act on the side of the lock core to limit and release the lock. Furthermore, to improve the safety of the lock, a set of limiting structures is often placed between the electromagnetic structure and the lock core to prevent rotation. The electromagnetic structure no longer directly acts on the lock core, but instead limits the limiting structure, preventing the locking structure from locking the lock core and preventing it from unlocking. As can be seen from the above, the lock core, electromagnetic structure, and even the limiting structure of existing passive locks are all arranged side by side within the lock body, requiring a relatively large cavity within the lock body. Consequently, the lock body is relatively large. However, in applications such as lockers, the volume of locks is increasingly smaller, and existing passive locks are no longer able to meet this demand. Summary of the Invention

[0004] The purpose of the present invention is to provide a passive electronic lock and propose a new structural design, which can further compress the internal space of the lock, thereby achieving a smaller lock volume to meet the application needs of specific customers.

[0005] In order to achieve the above object, the solution of the present invention is:

[0006] A passive electronic lock comprises a lock body, a lock core, a circuit board, an electromagnet and a conductive shaft; the lock body is provided with a movable cavity for rotationally engaging the lock core, and a lock anti-rotation mechanism is provided between the lock core and the lock body; the lock core is made of conductive material, and a plug slot for engaging an electronic key is provided on its front face, and a plug hole is provided in the plug slot; a mounting cavity is provided between the front and rear ends of the lock core; the circuit board and the electromagnet are both provided in the mounting cavity, and the electromagnet is electrically connected to the circuit board; the conductive shaft is provided in the plug hole and is insulated between the lock core, and the conductive shaft is electrically connected to one electrode of the circuit board; the other electrode of the circuit board is electrically connected to the inner wall of the mounting cavity; the iron core of the electromagnet is arranged opposite to the anti-rotation mechanism; when the electromagnet is powered off, the iron core acts on the anti-rotation mechanism to keep the lock core locked, and when the electromagnet is powered on, the iron core disengages from the anti-rotation mechanism to release the lock core.

[0007] The lock core includes a first core body and a second core body, the first core body is the front end of the lock core, and the second core body is the rear end of the lock core. The first core body and the second core body can be detachably assembled to achieve coaxial rotation, and the installation cavity is formed between the two; the plug-in slot is arranged on the end face of the first core body facing away from the second core body.

[0008] Preferably, the anti-rotation mechanism includes a retaining ring arranged between the first core body and the second core body, and the retaining ring is circumferentially limitedly engaged with the side wall of the movable cavity, and is provided with a special-shaped hole composed of an arc groove and a limit groove; the lock core also includes a mounting plate for positioning and installing the circuit board and the electromagnet; the mounting cavity is arranged in the second core body, and the mounting plate covers the opening of the mounting cavity, and is provided with a second through-hole and a connecting hole for the iron core to pass through; the first core body is provided with a connecting column facing the second core body, and the connecting column is passed through the arc groove and inserted into the connecting hole so that the first core body and the second core body can rotate coaxially, and the arc groove makes way for the rotation of the connecting column; when the iron core is extended, it is passed through the second through-hole and engaged in the limit groove.

[0009] Preferably, at least one anti-rotation protrusion is provided on the circumferential surface of the retaining ring, and an anti-rotation recess is provided on the inner wall of the movable cavity for the anti-rotation protrusion to be embedded, so that the retaining ring and the lock body are circumferentially limited.

[0010] Preferably, the lock body includes a lock shell and a limiting pin; the movable cavity is arranged in the lock shell, and the movable cavity is open at the rear end, and a second through hole is provided at the front end for the front end of the lock core to pass through; the peripheral surface of the second core body is provided with a long strip hole extending along the circumference of the second core body; the lock core is fitted in the movable cavity, and the limiting pin is passed through the peripheral surface of the lock shell and fitted in the long strip hole.

[0011] Preferably, the passive electronic lock also includes a second steel ball and a gear spring; a movable groove is provided on the circumferential surface of the second core, and a gear groove at the same height as the movable groove is provided on the inner wall of the movable cavity; the gear spring and the second steel ball are sequentially fitted in the movable groove, and the second steel ball abuts against the inner wall of the movable cavity under the action of the gear spring and movably fits with the gear groove.

[0012] The circuit board is arranged along the axial plane of the lock core and on the side of the electromagnet; the two electrodes of the circuit board are respectively arranged on its edge and the plane facing away from the electromagnet, and a spring made of conductive material is provided on the other electrode of the circuit board, and the spring is elastically fitted on the side wall of the mounting cavity.

[0013] The iron core of the electromagnet is parallel to the axial direction of the lock core, and the iron core faces the front end of the lock core.

[0014] The passive electronic lock also includes a first steel ball arranged on the lock core; a movable hole for the first steel ball to movably cooperate is provided on the front circumference of the lock core, and a clearance groove at the same height as the movable hole is provided on the inner wall of the movable cavity in the locking and unlocking positions of the lock.

[0015] The passive electronic lock further includes an insulating sleeve; the insulating sleeve is arranged on the side wall of the plug hole.

[0016] The passive electronic lock also includes a lock tongue; the rear end of the lock core passes through the rear end of the active cavity, the lock tongue is sleeved on the circumference of the lock core, and is limited by a limiting sleeve sleeved on the end of the lock core.

[0017] Preferably, a rotation-stopping plane is provided on the circumferential surface of the lock core, and the lock tongue is sleeved on the rotation-stopping plane to achieve circumferential limitation. The length of the rotation-stopping plane determines the effective length of the lock tongue to the lock body.

[0018] After adopting the above technical solution, the present invention has the following technical effects:

[0019] ① By using a conductive material to make a lock core, and setting a conductive shaft in the plug hole of the lock core, the conductive shaft is insulated from the lock core and directly electrically connected to one electrode of the circuit board, while the other electrode of the circuit board is directly electrically connected to the inner wall of the installation cavity. After the electronic key is inserted into the plug slot, it can be electrically connected to the two electrodes of the circuit board through the conductive shaft and the lock core respectively, thereby realizing the conduction of the lock power supply circuit;

[0020] ② The present invention no longer requires wires, which reduces the number of lock accessories and the demand for internal installation space. The layout of accessories is no longer affected by wires. At the same time, the circuit board and electromagnet are directly arranged inside the lock core, and the internal space of the lock core is rationally utilized for assembly, so that the circuit board, electromagnet, lock core, and lock body are in a shell-and-shell relationship, and the layout of accessories is designed to be more compact, which can further compress the volume of the lock and meet the user needs of small-volume products. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a perspective view of a first embodiment of the present invention;

[0022] Figure 2 is an exploded view of a first embodiment of the present invention;

[0023] Figure 3 It is a front view of the first embodiment of the present invention;

[0024] Figure 4 A top view of a first embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the locked state of the first embodiment of the present invention. Figure 1 ( Figure 3 Middle AA direction);

[0026] Figure 6 This is a schematic diagram of the locked state of the first embodiment of the present invention. Figure 2 ( Figure 4 Middle BB direction);

[0027] Figure 7 This is a schematic diagram of the unlocking state of the first embodiment of the present invention. Figure 1 ( Figure 3 Middle AA direction);

[0028] Figure 8 This is a schematic diagram of the unlocking state of the first embodiment of the present invention. Figure 2 ( Figure 7 Middle CC direction);

[0029] Figure 9 Schematic diagram of the plug-in state of the first embodiment of the present invention and the electronic key;

[0030] Figure 10This is a functional schematic diagram of the first steel ball according to the first embodiment of the present invention;

[0031] Figure 11 for Figure 10 Cross-sectional view in the middle DD direction;

[0032] Figure 12 is a perspective view of a second embodiment of the present invention;

[0033] Figure 13 is an exploded view of a second embodiment of the present invention;

[0034] Figure 14 Schematic diagram of the cooperation between the lock housing and the retaining ring according to the second embodiment of the present invention;

[0035] Figure 15 This is a schematic diagram of the locked state of the second embodiment of the present invention;

[0036] Figure 16 This is a schematic diagram of the unlocking state of the second embodiment of the present invention;

[0037] Figure 17 This is a functional schematic diagram of the second steel ball according to the second embodiment of the present invention;

[0038] Figure 18 is a perspective view of a third embodiment of the present invention;

[0039] Figure 19 is an exploded view of a third embodiment of the present invention;

[0040] Figure 20 is a cross-sectional view of a third embodiment of the present invention;

[0041] Description of Figure Numbers:

[0042] 1---lock body; 11---lock shell; 111--active cavity;

[0043] 112--Give way slot; 113--Mounting flange; 114--External thread;

[0044] 115--Anti-rotation groove; 116--Anti-rotation recess; 117--Second through hole;

[0045] 118--gear slot; 12---end cover; 121--first through hole;

[0046] 13---limiting pin; 2----lock cylinder; 21---first core;

[0047] 211--plug slot; 212--plug hole; 213--movable hole;

[0048] 214 - connecting column; 22 - second core; 221 - mounting cavity;

[0049] 222--groove; 223--screw; 224--long hole;

[0050] 225--movable slot; 226--mounting column; 227--anti-rotation plane;

[0051] 23---mounting plate; 231--second perforation; 232--connection hole;

[0052] 3----circuit board; 4----electromagnet; 41---iron core;

[0053] 5----conductive shaft; 6----lock tongue; 7----first steel ball;

[0054] 8----Electronic key; 81---Ball slot; 82---Metal plug;

[0055] 83---elastic contact; 9----insulating sleeve; 10---movable pin;

[0056] 20---return spring; 30---guide block; 301--guide channel;

[0057] 302--first perforation; 40---spring needle; 50---nut;

[0058] 60---retaining ring; 601--arc groove; 602--limiting groove;

[0059] 603--Anti-rotation protrusion; 70---Second steel ball; 80---Gear spring;

[0060] 90---shrapnel; 100--combination screw; 200--limiting sleeve. DETAILED DESCRIPTION

[0061] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0062] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0063] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention, but merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort shall fall within the scope of the present invention.

[0064] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0065] In the description of the embodiments of the present invention, it should be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are merely simplified descriptions for the convenience of describing the embodiments of the present invention, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0066] Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0067] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two elements or the interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0068] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0069] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0070] Furthermore, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0071] refer to Figures 1 to 17 As shown, the present invention discloses a passive electronic lock, comprising a lock body 1, a lock core 2, a circuit board 3, an electromagnet 4 and a conductive shaft 5;

[0072] The lock body 1 is provided with a movable cavity 111 for the lock core 2 to rotate with, and a rotation-stopping mechanism of the lock is provided between the lock core 2 and the lock body 1;

[0073] The lock core 2 is made of conductive material, and its front surface is provided with a plug-in slot 211 for the electronic key 8 to cooperate with, and a plug-in hole 212 is provided in the plug-in slot 211; an installation cavity 221 is provided between the front and rear ends of the lock core 2;

[0074] The circuit board 3 and the electromagnet 4 are both arranged in the mounting cavity 221, and the electromagnet 4 is electrically connected to the circuit board 3;

[0075] The conductive shaft 5 is disposed in the insertion hole 212 and is insulated from the lock core 2. The conductive shaft 5 is electrically connected to one electrode of the circuit board 3. The other electrode of the circuit board 3 is electrically connected to the inner wall of the mounting cavity 221.

[0076] The iron core 41 of the electromagnet 4 is arranged opposite to the anti-rotation mechanism; when the electromagnet 4 is powered off, the iron core 41 acts on the anti-rotation mechanism to keep the lock cylinder 2 locked, and when the electromagnet 4 is powered on, the iron core 41 disengages the anti-rotation mechanism to release the lock cylinder 2.

[0077] Through the above scheme, the present invention uses a conductive material to make a lock core 2, and arranges a conductive shaft 5 in the plug hole 212 of the lock core 2. The conductive shaft 5 is insulated from the lock core 2 and is directly electrically connected to one electrode of the circuit board 3, while the other electrode of the circuit board 3 is directly electrically connected to the inner wall of the installation cavity 221. After the electronic key 8 is inserted into the plug slot 211, it can be electrically connected to the two electrodes of the circuit board 3 through the conductive shaft 5 and the lock core 2, respectively, to achieve the conduction of the lock power supply circuit; the present invention no longer sets wires, so that the accessories of the lock are reduced, the internal demand for installation space is reduced, and the layout of the accessories is no longer interfered with by the wires. At the same time, the circuit board 3 and the electromagnet 4 are directly arranged inside the lock core 2, and the internal space of the lock core 2 is reasonably utilized for assembly, so that the circuit board 3, the electromagnet 4 and the lock core 2 and the lock body 1 are in a shell relationship, and the layout of the accessories is designed to be more compact, which can further compress the volume of the lock and meet the user needs of small-volume products.

[0078] Specific embodiments of the present invention are shown below.

[0079] In some embodiments of the above passive electronic lock, a lock tongue 6 is further included; the rear end of the lock core 2 passes through the rear end of the active cavity 111 , and the lock tongue 6 is assembled on the rear end of the lock core 2 .

[0080] In some embodiments of the above-mentioned passive electronic lock, the lock core 2 includes a first core 21 and a second core 22. The first core 21 is the front end of the lock core 2, and the second core 22 is the rear end of the lock core 2. The first core 21 and the second core 22 are detachably assembled to achieve coaxial rotation, and the above-mentioned installation cavity 221 is formed therebetween. The above-mentioned insertion groove 211 is provided on the end face of the first core 21 facing away from the second core 22. The end of the second core 22 facing away from the first core 21 passes through the rear end of the movable cavity 111 for assembling the lock tongue 6. The split design of the lock core 2 into the first core 21 and the second core 22 facilitates the installation of the circuit board 3 and the electromagnet 4, reduces the difficulty of assembly, improves efficiency, and also facilitates the processing of the first core 21 and the second core 22.

[0081] In some embodiments of the passive electronic lock, the iron core 41 of the electromagnet 4 is parallel to the axis of the lock cylinder 2 and faces the front end of the lock cylinder 2. Once the lock is installed in the preset position, if someone attempts to forcibly unlock the lock using a magnet, the iron core 41, attracted by the magnet, can only extend toward the front end of the lock cylinder 2. In other words, the direction of movement of the iron core 41 after being attracted by the magnet is the same as the direction of movement of the iron core 41 after power is removed, both being the locking direction. Unlocking is impossible, thereby improving the lock's anti-theft performance.

[0082] In some embodiments of the above passive electronic lock, a first steel ball 7 is further provided on the lock core 2; a movable hole 213 for the first steel ball 7 to flexibly engage with is provided on the front circumference of the lock core 2; and a clearance groove 112 is provided on the inner wall of the movable cavity 111 at the same height as the movable hole 213 in both the locked and unlocked positions of the lock. Figure 9 As shown, a ball groove 81 corresponding to the movable hole 213 can be provided on the electronic key 8, thereby preventing the electronic key 8 from being pulled out during use and causing poor contact with the lock, which may cause abnormal opening and closing of the lock. The working principle of this can be seen in the working principle of the first steel ball 7 described in the first embodiment below.

[0083] In some embodiments of the passive electronic lock, an insulating sleeve 9 is further included; the insulating sleeve 9 is disposed on the side wall of the insertion hole 212. The insulating sleeve 9 prevents the conductive shaft 5 from contacting the inner wall of the insertion hole 212, thereby achieving insulation between the conductive shaft 5 and the lock core 2.

[0084] In some embodiments of the aforementioned passive electronic lock, the front circumference of the lock body 1 is provided with a mounting flange 113, and the rear circumference of the lock body 1 is provided with external threads 114. The external threads 114 allow the lock body 1 (and thus the entire lock) to be installed in a predetermined location (such as a door panel, cabinet door, drawer front, etc.) via a threaded connection, while the mounting flange 113 limits the installation depth of the lock body 1.

[0085] According to the difference of the anti-rotation mechanism, two specific embodiments of the present invention are shown below.

[0086] refer to Figures 1 to 11 FIG. 1 is a first embodiment of the present invention.

[0087] The anti-rotation mechanism includes a movable pin 10 and a return spring 20 arranged on the circumference of the lock cylinder 2, and an anti-rotation groove 115 arranged on the inner wall of the movable cavity 111; the movable pin 10 is embedded in the circumference of the lock cylinder 2, and its outer end abuts the inner wall of the movable cavity 111 under the action of the return spring 20 and movably cooperates with the anti-rotation groove 115; the iron core 41 of the electromagnet 4 is arranged relative to the inner end of the movable pin 10: when the iron core 41 is extended, the movable pin 10 is limited to achieve locking of the lock cylinder 2, and when the iron core 41 is retracted, there is space for the movable pin 10 to move to release the lock of the lock cylinder 2. The cooperation between the movable pin 10 and the anti-rotation groove 115 can not only achieve locking of the lock cylinder 2, but also make the lock cylinder 2 have a gear sense during rotation, so that the operator can more clearly feel that the lock is locked or unlocked.

[0088] Furthermore, the present invention includes a guide block 30 disposed within the lock core 2. The guide block 30 has a guide channel 301 disposed radially along the lock core 2. The inner end circumference of the guide channel 301 is provided with a first through-hole 302 through which the iron core 41 of the power supply magnet 4 passes. The return spring 20 and the movable pin 10 are sequentially engaged within the guide channel 301. When the iron core 41 is inserted into the inner end of the guide channel 301 through the first through-hole 302, the movable pin 10 is prevented from retracting, making it impossible to rotate the lock core 2. When the iron core 41 escapes from the guide channel 301, the movable pin 10 can compress the return spring 20 and retract, allowing the lock core 2 to be rotated, causing the movable pin 10 to compress the return spring 20 and retract into the guide channel 301.

[0089] Furthermore, a front end surface of the second core body 22 is provided with an embedding groove 222 for assembling the guide block 30 .

[0090] The above-mentioned lock body 1 includes a lock shell 11 and an end cover 12; the above-mentioned active cavity 111 is arranged in the lock shell 11, and the active cavity 111 is open at the front end; the lock core 2 is installed in the active cavity 111 and is limited by the end cover 12 installed at the front end opening of the active cavity 111; the end cover 12 is provided with a first through hole 121 for the front end of the lock core 2 to pass through.

[0091] The above-mentioned circuit board 3 is arranged along the radial plane of the lock cylinder 2, that is, the circuit board 3 is arranged on the end face of the electromagnet 4, which can make the radius of the lock cylinder 2 smaller; the two electrodes of the circuit board 3 are both arranged on its plane facing the conductive shaft 5, and a spring pin 40 is provided on the other electrode of the circuit board 3. The spring pin 40 elastically fits on the end wall of the mounting cavity 221, so that the electrical connection between the circuit board 3 and the lock cylinder 2 can be achieved without wires.

[0092] The rear end of the second core 22 is a screw rod 223 , and the locking tongue 6 is sleeved on the screw rod 223 and locked by a nut 50 .

[0093] refer to Figure 5 and Figure 6 As shown, the locked state of the first embodiment is:

[0094] The iron core 41 of the electromagnet 4 is pushed out by the spring of the electromagnet 4. At this time, the front end of the movable pin 10 is in the anti-rotation groove 115 of the movable cavity 111. When the electronic key 8 is rotated and drives the first core body 21 and the second core body 22 to rotate synchronously, the inner end of the movable pin 10 is blocked by the iron core 41 and cannot be squeezed and retracted by the inner wall of the movable cavity 111, so that the lock cylinder 2 is locked and cannot be unlocked.

[0095] refer to Figure 7 and Figure 8 As shown, the unlocking state of the second embodiment is:

[0096] Insert the electronic key 8, which sends an unlock command to the circuit board 3. The circuit board 3 activates the electromagnet 4, which energizes and retracts the iron core 41, which no longer blocks the inner end of the movable pin 10. The electronic key 8 is then rotated, driving the entire lock cylinder 2. The outer end of the movable pin 10 disengages the anti-rotation groove 115 and is squeezed back into the guide channel 301 by the inner wall of the movable cavity 111, successfully unlocking the door.

[0097] refer to Figures 9 to 11 As shown, since the inner wall of the movable cavity 111 is provided with a clearance groove 112 in both the locked and unlocked positions, and the electronic key 8 is provided with a corresponding ball groove 81, when the lock cylinder 2 is in the locked or unlocked state, the action of inserting and removing the electronic key 8 will squeeze the first steel ball 7 into the clearance groove 112; when the lock cylinder 2 is in the state between locked and unlocked, the side wall of the lock body 1 will squeeze the first steel ball 7 into the ball groove 81 of the electronic key 8. At this time, the electronic key 8 cannot be pulled out. Only by turning the electronic key 8 to rotate the lock cylinder 2 to the locked or unlocked position can the electronic key 8 be pulled out. In addition, the electronic key 8 has a metal plug 82 that matches the insertion slot 211, and a spring contact 83 arranged in the metal plug 82, and the spring contact 83 is insulated from the metal plug 82; the metal plug 82 is inserted into the insertion slot 211 so that the spring contact 83 abuts the end face of the conductive shaft 4; the metal plug 82 and the spring contact 83 are respectively electrically connected to the two electrodes of the built-in battery of the electronic key 8, and the maximum voltage of the built-in battery does not exceed 3.6V.

[0098] refer to Figures 12 to 17 FIG. 2 shows a second embodiment of the present invention.

[0099] The above-mentioned anti-rotation mechanism includes a retaining ring 60 arranged between the first core 21 and the second core 22. The retaining ring 60 is circumferentially limited and fits on the side wall of the active cavity 111. A special-shaped hole consisting of an arc groove 601 and a limiting groove 602 is provided on the retaining ring 60. The lock cylinder 2 also includes a mounting plate 23 for positioning and mounting the circuit board 3 and the electromagnet 4. The mounting cavity 221 is arranged in the second core 22. The mounting plate 23 covers the opening of the mounting cavity 221. A second through hole 231 and a connecting hole 232 for the iron core 41 to pass through are provided on the retaining ring 60. The first core 21 is provided with There is a connecting column 214 facing the second core body 22. The connecting column 214 is passed through the arc groove 601 and inserted into the connecting hole 232 to realize the coaxial rotation of the first core body 21 and the second core body 22, and when the first core body 21 and the second core body 22 rotate synchronously, the arc groove 601 makes way for the connecting column 214 during rotation and will not interfere with the rotation of the entire lock core 2; when the iron core 41 is extended, it can be passed through the second through hole 231 and fit in the limiting groove 602. At this time, the lock core 2 is restricted by the cooperation between the iron core 41 and the limiting groove 602 and cannot rotate.

[0100] Furthermore, at least one anti-rotation protrusion 603 is provided on the circumferential surface of the above-mentioned retaining ring 60, and the inner wall of the movable cavity 111 is provided with an anti-rotation recess 116 for embedding the anti-rotation protrusion 603, so as to achieve circumferential limitation between the retaining ring 60 and the lock body 1, so that when the lock core 2 is inserted into the limiting groove 602 of the retaining ring 60, the rotation of the lock core 2 can be restricted, thereby achieving locking.

[0101] The above-mentioned lock body 1 includes a lock shell 11 and a limiting pin 13; the above-mentioned active cavity 111 is arranged in the lock shell 11, and the active cavity 111 is open at the rear end, and its front end is provided with a second through hole 117 for the front end of the lock cylinder 2 to pass through; the circumferential surface of the second core body 22 is provided with a long strip hole 224 extending along the circumference of the second core body 22; after the lock cylinder 2 is engaged in the active cavity 111, the limiting pin 13 is penetrated by the circumferential surface of the lock shell 11 and engaged in the long strip hole 224 to realize axial limitation of the second core body 22, thereby limiting the entire lock cylinder 2 in the lock shell 11 and realizing the installation of the lock cylinder 2.

[0102] The second embodiment further includes a second steel ball 70 and a shift spring 80. A movable groove 225 is provided on the circumference of the second core 22, and a shift groove 118 is provided on the inner wall of the movable cavity 111 at the same height as the movable groove 225. The shift spring 80 and the second steel ball 70 are sequentially engaged in the movable groove 225. Under the action of the shift spring 80, the second steel ball 70 abuts the inner wall of the movable cavity 111 and flexibly engages with the shift groove 118. The provision of the second steel ball 70 and the shift spring 80 can provide a sense of shift position during the rotation of the lock cylinder 2, allowing the operator to more clearly feel that the lock is locked or unlocked.

[0103] The above-mentioned circuit board 3 is arranged along the axial plane of the lock cylinder 2, that is, the circuit board 3 is arranged on the side of the electromagnet 4, which can make the length of the lock cylinder 2 smaller; the two electrodes of the circuit board 3 are respectively arranged on its edge and the plane facing away from the electromagnet 4, and a spring piece 90 made of conductive material is provided on the other electrode of the circuit board 3. The spring piece 90 is elastically fitted on the side wall of the installation cavity 221, so that the electrical connection between the circuit board 3 and the lock cylinder 2 can be achieved without wires.

[0104] The rear end of the second core 22 is a mounting post 226 , in which a screw hole is provided. The locking tongue 6 is sleeved on the mounting post 226 and is locked by a combination screw 100 .

[0105] refer to Figure 15 As shown, the locked state of the second embodiment is:

[0106] The iron core 41 of the electromagnet 4 is pushed out by the spring of the electromagnet 4, and the iron core 41 passes through the mounting plate 23 and fits in the limiting groove 602 of the retaining ring 60; when the electronic key 8 is rotated and drives the first core 21 and the second core 22 to rotate synchronously, the retaining ring 60 and the lock body 1 are circumferentially limited and cannot rotate, and the limiting groove 602 also limits the iron core 41, so the lock cylinder 2 cannot be rotated and the lock cannot be unlocked.

[0107] refer to Figure 16 As shown, the unlocking state of the second embodiment is:

[0108] Insert the electronic key 8, which sends an unlock command to the circuit board 3. The circuit board 3 controls the electromagnet 4, which is energized and retracts the iron core 41. The iron core 41 is then freed from the retaining ring 60 and is no longer restrained by it. The electronic key 8 is then rotated, causing the entire lock cylinder 2 to rotate, successfully unlocking the door.

[0109] The second embodiment also has the function of preventing the electronic key 8 from being plugged in or out during use. Its structure and principle are the same as those of the first embodiment, and will not be described in detail here.

[0110] refer to Figures 18 to 20 FIG. 1 is a third embodiment of the present invention.

[0111] The third embodiment is similar to the first embodiment in most of its structures and principles. The anti-rotation mechanism also includes a movable pin 10 and a return spring 20 arranged on the circumference of the lock core 2, and a guide block 30 for installing the movable pin 10 and the return spring 20 is also provided.

[0112] The main difference between the third embodiment and the first embodiment is that:

[0113] The locking tongue 6 in the first embodiment is mounted on the screw 223 at the rear end of the second core 22, while in the third embodiment, the locking tongue 6 is mounted on the circumferential surface of the second core 22 and is limited by a limiting sleeve 200 sleeved on the end of the second core 22. The limiting sleeve 200 is locked to the end of the second core 22 by a combination screw 100.

[0114] Furthermore, the circumferential surface of the second core 22 is provided with a stop surface 227, and the lock tongue 6 is mounted on the stop surface 227 to achieve circumferential position limiting. This allows the lock cylinder 2 (i.e., the first core 21 and the second core 22) to rotate and drive the lock tongue 6 to rotate synchronously. When the second core 22 is manufactured, the stop surface 227 can be machined to different lengths according to customer requirements to achieve different effective lengths of the lock tongue 6 relative to the lock body 1. At the same time, the lock tongue 6 can be installed in a position-limited manner in conjunction with the stop sleeves 200 of different lengths.

[0115] In addition, the thickness of the mounting flange 113 of the first embodiment and the third embodiment is also different, which determines the different protrusion degrees when the lock is installed in a predetermined installation position (such as a door panel), and also affects the effective length between the lock body 1 and the lock cylinder 2.

[0116] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A passive electronic lock, characterized in that: It includes a lock body, a lock core, a circuit board, an electromagnet and a conductive shaft; The lock body is provided with a movable cavity for the rotational cooperation of the lock core, and a rotation-stopping mechanism of the lock is provided between the lock core and the lock body; The lock core is made of conductive material, and its front end is provided with a plug-in slot for the electronic key to cooperate with, and a plug-in hole is provided in the plug-in slot; an installation cavity is provided between the front and rear ends of the lock core; The circuit board and the electromagnet are both arranged in the mounting cavity, and the electromagnet is electrically connected to the circuit board; The conductive shaft is disposed in the insertion hole and is insulated from the lock core, and the conductive shaft is electrically connected to one electrode of the circuit board; the other electrode of the circuit board is electrically connected to the inner wall of the installation cavity; The iron core of the electromagnet is arranged opposite to the anti-rotation mechanism; when the electromagnet is powered off, the iron core acts on the anti-rotation mechanism to keep the lock core locked; when the electromagnet is powered on, the iron core disengages from the anti-rotation mechanism to release the lock core; The lock core includes a first core body and a second core body, wherein the first core body is the front end of the lock core, and the second core body is the rear end of the lock core. The first core body and the second core body are detachably assembled to achieve coaxial rotation, and the installation cavity is formed therebetween; the insertion groove is provided on the end surface of the first core body facing away from the second core body; The anti-rotation mechanism includes a retaining ring arranged between the first core body and the second core body, and the retaining ring is circumferentially limitedly engaged with the side wall of the movable cavity, and is provided with a special-shaped hole consisting of an arc groove and a limit groove; the lock core also includes a mounting plate for positioning and installing the circuit board and the electromagnet; the mounting cavity is arranged in the second core body, and the mounting plate covers the opening of the mounting cavity, and is provided with a second through-hole and a connecting hole for the iron core to pass through; the first core body is provided with a connecting column facing the second core body, and the connecting column is passed through the arc groove and inserted into the connecting hole so that the first core body and the second core body can rotate coaxially, and the arc groove makes way for the rotation of the connecting column; when the iron core is extended, it is passed through the second through-hole and engaged in the limit groove.

2. The passive electronic lock according to claim 1, characterized in that: At least one anti-rotation protrusion is provided on the circumferential surface of the retaining ring, and an anti-rotation recess is provided on the inner wall of the movable cavity for the anti-rotation protrusion to be embedded, so that the retaining ring and the lock body are circumferentially limited.

3. The passive electronic lock according to claim 1, characterized in that: The lock body includes a lock shell and a limiting pin; the movable cavity is provided in the lock shell, and the movable cavity is open at the rear end, and a second through hole is provided at the front end thereof for the front end of the lock core to pass through; the circumferential surface of the second core body is provided with an elongated hole extending along the circumference of the second core body; The lock core is fitted in the movable cavity, and the limiting pin is penetrated from the circumference of the lock shell and fitted in the long hole.

4. The passive electronic lock according to claim 1, characterized in that: It also includes a second steel ball and a gear spring; a movable groove is provided on the circumferential surface of the second core body, and a gear groove with the same height as the movable groove is provided on the inner wall of the movable cavity; the gear spring and the second steel ball are sequentially fitted in the movable groove, and the second steel ball abuts against the inner wall of the movable cavity under the action of the gear spring and movably fits with the gear groove.

5. The passive electronic lock according to claim 1, characterized in that: The circuit board is arranged along the axial plane of the lock core and on the side of the electromagnet; the two electrodes of the circuit board are respectively arranged on its edge and the plane facing away from the electromagnet, and a spring made of conductive material is provided on the other electrode of the circuit board, and the spring is elastically fitted on the side wall of the mounting cavity.

6. The passive electronic lock according to claim 1, characterized in that: It also includes a first steel ball arranged on the lock core; a movable hole for the first steel ball to movably cooperate is provided on the front circumference of the lock core, and a yield groove at the same height as the movable hole is provided on the inner wall of the movable cavity in the locking and unlocking positions of the lock.

7. The passive electronic lock according to claim 1, characterized in that: It also includes a lock tongue; the rear end of the lock core passes through the rear end of the active cavity, the lock tongue is sleeved on the circumference of the lock core, and is limited by a limiting sleeve sleeved on the end of the lock core.

8. The passive electronic lock according to claim 7, characterized in that: A rotation-stopping plane is provided on the circumferential surface of the lock core, and the lock tongue is sleeved on the rotation-stopping plane to achieve circumferential limitation. The length of the rotation-stopping plane determines the effective length of the lock tongue to the lock body.

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