NFC self-resetting cam lock

Abstract

The invention relates to an NFC self-resetting cam lock. The NFC self-resetting cam lock comprises a lock body and a knob which are matched with each other, the lock body comprises a cylindrical shell and a lock cylinder rotatably arranged in the cylindrical shell, the lock cylinder comprises a cylindrical core body, a control circuit board, a battery and a clutch assembly, the control circuit board, the battery and the clutch assembly are arranged in the cylindrical core body, and the battery is electrically connected with the control circuit board; the clutch assembly comprises a micro motor which is fixed in the cylindrical core body and is electrically connected with the control circuit board, and a limiting column which is transversely and rotatably connected to the interior of the cylindrical core body and is concentrically fixed on a rotating shaft of the micro motor; the locking column is vertically positioned above the limiting column and is movably connected to the interior of the cylindrical core body, so that the locking column has an up-and-down vertical moving function and always keeps an upward elastic resetting trend; according to the invention, the NFC technology is applied to the cam lock to realize intelligent transformation of the cam lock, so that the operation is simplified to facilitate use, and the safety is effectively improved; and the method has a wide application range and is suitable for large-scale popularization.

Description

Technical Field

[0001] The invention relates to an NFC self-resetting cam lock. Background Art

[0002] Cam locks are primarily used on the front doors of filing cabinets, lockers and cabinets. They provide a mechanical locking mechanism and are smaller and more compact than standard door locks, making them ideal for use on equipment such as electrical cabinets, cash registers, safes, filing cabinets and display cases.

[0003] NFC is the abbreviation of Near Field Communication, also known as near field communication. Near field communication is a type of wireless communication technology that can perform wireless communication within a short distance (usually a few centimeters) with fast communication speed and high security. Devices using NFC technology are equipped with NFC chips. Users can use mobile phones or other devices that support NFC technology to place them close to the door lock to establish a signal connection with the NFC chip, thereby completing identity authentication and control operations.

[0004] The existing cam locks cannot realize automatic unlocking and locking functions. They must be unlocked and locked manually by turning a mechanical key. The operation is cumbersome and inconvenient to use. They are not intelligent at all and cannot adapt to the diverse usage needs of users. Therefore, they are gradually being eliminated. In addition, mechanical keys are easy to forget or lose, and are difficult to replicate and have a high chance of being opened by each other. Therefore, the security is poor and an urgent solution is needed. Summary of the invention

[0005] In view of the current status of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide an NFC self-resetting cam lock that applies NFC technology to the cam lock to realize the intelligent transformation of the cam lock, so that the cam lock has automatic unlocking and locking functions to eliminate the use of mechanical keys, thereby simplifying the operation to facilitate use and effectively improving safety. It also has an advanced level of intelligence to adapt to the diverse usage needs of users, and at the same time has a compact structure to better balance the size, thereby having a large scope of application, having broad market prospects and being suitable for large-scale promotion.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: an NFC self-resetting cam lock, characterized in that it comprises a lock body and a knob that cooperate with each other;

[0007] The lock body comprises a cylindrical shell and a lock core rotatably arranged inside the cylindrical shell, the lock core comprises a cylindrical core body and a control circuit board, a battery and a clutch assembly arranged inside the cylindrical core body, and the battery is electrically connected to the control circuit board;

[0008] The clutch assembly includes a micro motor fixed inside the cylindrical core and electrically connected to the control circuit board, a limit post laterally and rotatably connected inside the cylindrical core and concentrically fixed on the rotating shaft of the micro motor, and a locking post vertically located above the limit post and movably connected inside the cylindrical core to have the function of vertical movement up and down and always maintain an upward elastic reset tendency;

[0009] A concave cavity is provided on the outer circumferential surface of the limiting column, which cooperates with the lower end of the locking column; a first limiting notch is provided on the upper inner wall of the rear end opening of the cylindrical shell, and the upper end of the locking column movably extends to the outside of the cylindrical core and cooperates with the first limiting notch;

[0010] The clutch assembly also includes a traction column arranged between the micro-motor rotating shaft and the limit column, a linkage block movably connected to the inside of the cylindrical core body so as to have a forward and backward translation function and always maintain a forward elastic reset tendency and located below the traction column, a locking strip transversely arranged in front of the linkage block and movably connected to the inside of the cylindrical core body so as to have a forward and backward translation function and always maintain a backward elastic reset tendency, and a positioning steel ball movably embedded in the lower side of the cylindrical core body and located below the locking strip, and the linkage block has a forward movement and reset tendency greater than the backward movement and reset tendency of the locking strip;

[0011] The rear end of the traction column is formed with a concentrically arranged protrusion in the direction of the limiting column. Correspondingly, the front end of the limiting column is formed with two clamping plates diagonally arranged on both sides of the central axis of the limiting column in the direction of the traction column and both cooperate with the protrusion, and the protrusion is inserted between the two clamping plates;

[0012] The top of the linkage block is provided with an arc-shaped rotating groove, the inner wall of the arc-shaped rotating groove is provided with a stopper upwardly formed, the front side of the stopper is provided with an arc-shaped guiding surface, the outer peripheral surface of the traction column is provided with a guide block outwardly formed, the end of the guide block cooperates with the inner wall of the arc-shaped rotating groove, and the rear outer wall of the guide block cooperates with the arc-shaped guiding surface;

[0013] A positioning groove cooperating with the positioning steel ball is provided at the bottom of the locking strip, a second limiting notch cooperating with the positioning steel ball is provided on the lower inner wall at the front end opening of the cylindrical shell; a third limiting notch cooperating with the positioning steel ball is also provided on the left inner wall at the front end opening of the cylindrical shell;

[0014] The knob is connected to the front end of the cylindrical core and cooperates with the front end of the locking strip.

[0015] Preferably, the knob includes a positioning ring concentrically sleeved on the outside of the front end of the cylindrical shell, a transparent cover fixed at the rear end opening of the positioning ring and sleeved and fixed on the outside of the front end of the cylindrical shell, a knob cover concentrically sleeved on the outside of the front end of the positioning ring and rotatable and repositionable and movable back and forth along the central axis of the positioning ring, and a retaining frame movably arranged inside the positioning ring to have the function of translation along the central axis of the positioning ring and always maintain a forward elastic reset trend, the front side of the retaining frame is fixed on the front inner wall of the knob cover, and the rear side of the retaining frame is slidably fitted on the front outer wall of the transparent cover; the knob also includes an NFC sensor fixed inside the knob cover and located in front of the retaining frame and wirelessly connected to the control circuit board.

[0016] Preferably, an eccentrically arranged clamping block is formed on the rear side of the retaining frame toward the direction of the cylindrical core body, and correspondingly, a circular concave cavity is formed at the front end of the cylindrical core body, and a clamping groove that cooperates with the clamping block is formed on the lower inner wall of the circular concave cavity, and the clamping block is slidably inserted in the clamping groove; a limiting groove is formed on the upper outer wall of the clamping block, and correspondingly, a convex sleeve is formed forward on the bottom surface of the circular concave cavity, and a convex strip is formed downward on the lower side of the outer peripheral surface of the convex sleeve, and the convex strip is slidably embedded in the limiting groove.

[0017] Preferably, an annular notch groove is provided on the inner circumferential surface of the rear end opening of the positioning ring, and a plurality of lug seats uniformly arranged at equal angles in the circumferential direction are formed between the inner circumferential surface of the annular notch groove and the inner circumferential surface of the positioning ring. Correspondingly, the outer edge of the retaining frame is formed with the same number of support blocks uniformly arranged at equal angles in the circumferential direction toward the direction of the transparent cover, and the plurality of support blocks and the plurality of lug seats are spaced apart and cooperate with each other, the transparent cover is embedded in the opening of the annular notch groove and fixed on the plurality of lug seats, and the front outer wall of the transparent cover is spaced a certain distance from the bottom surface of the annular notch groove.

[0018] Preferably, a lap block is formed outwardly on the outer edge of the end of each support block, and correspondingly, a rotation-stopping groove that cooperates with the lap block is provided between the same-side outer wall of each lug seat and the bottom surface of the annular notch groove.

[0019] Preferably, a mounting notch is provided on the upper side of the outer peripheral surface of the rear end of the cylindrical core body, and a removable arc-shaped cover plate is fixed in the mounting notch, a guide hole is provided in the arc-shaped cover plate, and the upper end of the locking column moves through the guide hole and extends above the arc-shaped cover plate, and a guide spherical surface is formed on the upper end of the locking column.

[0020] Preferably, a position sensing unit is also provided in the arc-shaped cover plate, and the position sensing unit includes an insulating seat sleeve embedded in the arc-shaped cover plate, a first return spring arranged inside the insulating seat sleeve, a sensing steel ball movably arranged inside the opening of the upper end of the insulating seat sleeve, and an arc-shaped sensing sheet fixed to the upper side of the inner circumference of the cylindrical shell and cooperating with the sensing steel ball. The first return spring is always in a compressed state so that its upper and lower ends are respectively pressed against the sensing steel ball and the corresponding contacts on the top of the control circuit board, so that the sensing steel ball rolls and is pressed against the inner circumference of the cylindrical shell and is electrically connected to the control circuit board through the first return spring.

[0021] Preferably, a seat block located behind the linkage block is formed inside the rear end of the cylindrical core body, a mounting groove is opened on the top of the seat block, the limiting column is laterally and rotatably connected to the bottom of the mounting groove, a detachable reference block is also fixed inside the opening of the mounting groove, and the locking column is movably inserted in the arc-shaped cover plate and the reference block to have the function of vertical movement up and down and always maintain an upward elastic reset tendency.

[0022] Preferably, a second countersunk hole is provided at the top of the reference block, and the lower end of the locking column is movably arranged in the second countersunk hole. A guide through hole is provided between the center of the bottom surface of the second countersunk hole and the bottom outer wall of the reference block. Correspondingly, a concentrically arranged guide column is formed downward at the lower end of the locking column, and the guide column is movably inserted in the guide through hole, and a telescopic column is formed downward at the end of the guide column which is concentrically arranged and cooperates with the concave cavity; a third return spring is also sleeved on the outside of the guide column, and the third return spring is always in a compressed state so that its upper and lower ends are respectively pressed against the lower end of the locking column and the bottom surface of the second countersunk hole.

[0023] Preferably, two receiving columns are laterally arranged and symmetrically distributed on the left and right sides of the linkage block toward the direction of the seat block. Correspondingly, two third countersunk holes are symmetrically arranged on the left and right sides of the seat block and respectively cooperate with the two receiving columns. The two receiving columns are movably inserted into the two third countersunk holes respectively; a laterally distributed fourth return spring is also sleeved on the outside of the two receiving columns, and each of the fourth return springs is always in a compressed state so that its front and rear ends are respectively pressed against the rear outer wall of the linkage block and the bottom surface of the third countersunk hole; an extension plate is laterally arranged on the front side of the linkage block toward the direction of the locking strip and cooperates with the rear end of the locking strip.

[0024] Compared with the prior art, the advantages of the present invention are: the present invention applies NFC technology to the cam lock to realize the intelligent transformation of the cam lock, so that the cam lock has automatic unlocking and locking functions to eliminate the use of mechanical keys, thereby simplifying the operation to facilitate use, and avoiding the phenomenon of easy forgetting, loss, duplication and mutual opening caused by the use of mechanical keys, thereby effectively improving safety; at the same time, it has an advanced degree of intelligence to adapt to the diverse usage needs of users; and the present invention also has an automatic and accurate reset function with the help of a knob, which is simple and easy to operate, thereby reducing the difficulty of use and further facilitating use; in addition, the present invention has a compact structure to better balance the size, and thus has a large scope of application to be better applied to electrical cabinets, cash registers, safes, filing cabinets, display cabinets and other equipment, so it has broad market prospects and is suitable for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an exploded structural diagram of the right front side of the lock body of the present invention;

[0026] Figure 2 It is a bottom-up structural diagram of the right rear side of the limiting column of the present invention;

[0027] Figure 3 It is a bottom-up structural diagram of the right rear side of the cylindrical shell of the present invention;

[0028] Figure 4 It is a bottom-up structural diagram of the traction column of the present invention from the right rear side;

[0029] Figure 5 It is a top view of the right front side structure of the linkage block of the present invention;

[0030] Figure 6 It is a top view of the right front side of the cylindrical shell of the present invention;

[0031] Figure 7 It is a right front exploded structural diagram of the knob of the present invention;

[0032] Figure 8 It is a bottom-up structural diagram of the retainer of the present invention from the right rear side;

[0033] Fig. 9 It is a top view of the right front side of the cylindrical core of the present invention;

[0034] Fig.10 It is a top view of the left rear side of the positioning ring of the present invention;

[0035] Fig.11 It is a top view of the right front side of the reference block of the present invention. DETAILED DESCRIPTION

[0036] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] In order to keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of well-known functions and well-known components are omitted.

[0038] like Figures 1 to 11 As shown, an NFC self-resetting cam lock comprises a lock body 1 and a knob 2 that cooperate with each other;

[0039] The lock body 1 includes a cylindrical housing 11 and a lock core rotatably disposed inside the cylindrical housing 11. The lock core includes a cylindrical core 12 and a control circuit board 13, a battery 112 and a clutch assembly disposed inside the cylindrical core 12. The battery 112 is electrically connected to the control circuit board 13.

[0040] The clutch assembly includes a micro motor 14 fixed inside the cylindrical core 12 and electrically connected to the control circuit board 13, a limit post 15 rotatably connected to the inside of the cylindrical core 12 and concentrically fixed on the rotating shaft of the micro motor 14, and a locking post 17 vertically located above the limit post 15 and movably connected to the inside of the cylindrical core 12 to have the function of vertical movement up and down and always maintain an upward elastic reset tendency;

[0041] A concave cavity 151 is provided on the outer circumferential surface of the limiting column 15 and cooperates with the lower end of the locking column 17; a first limiting notch 1101 is provided on the upper inner wall of the rear end opening of the cylindrical shell 11, and the upper end of the locking column 17 movably extends to the outside of the cylindrical core 12 and cooperates with the first limiting notch 1101;

[0042] The clutch assembly also includes a traction column 19 disposed between the rotating shaft of the micro motor 14 and the limiting column 15, a linkage block 113 movably connected to the inside of the cylindrical core 12 so as to have a forward and backward translation function and always maintain a forward elastic reset tendency and located below the traction column 19, a locking strip 114 transversely disposed in front of the linkage block 113 and movably connected to the inside of the cylindrical core 12 so as to have a forward and backward translation function and always maintain a backward elastic reset tendency, and a positioning steel ball 115 movably embedded in the lower side of the cylindrical core 12 and located below the locking strip 114, and the linkage block 113 has a forward movement reset tendency greater than the locking strip 114 has a backward movement reset tendency;

[0043] A concentrically arranged protrusion 192 is formed at the rear end of the traction column 19 toward the direction of the limiting column 15. Correspondingly, two clamping plates 152 are formed at the front end of the limiting column 15 toward the direction of the traction column 19. The clamping plates 152 are arranged diagonally on both sides of the central axis of the limiting column 15 and cooperate with the protrusion 192. The protrusion 192 is inserted between the two clamping plates 152.

[0044] An arc-shaped rotating groove 1131 is formed on the top of the linkage block 113, a stopper 1132 is formed upward on the inner wall of the arc-shaped rotating groove 1131, and an arc-shaped guide surface 1133 is formed on the front side of the stopper 1132. A guide block 191 is formed outward on the outer peripheral surface of the traction column 19, and the end of the guide block 191 cooperates with the inner wall of the arc-shaped rotating groove 1131, and the rear outer wall of the guide block 191 cooperates with the arc-shaped guide surface 1133.

[0045] The bottom of the locking strip 114 is provided with a positioning groove 1141 which cooperates with the positioning steel ball 115, and the lower inner wall of the front end opening of the cylindrical shell 11 is provided with a second limiting notch 1102 which cooperates with the positioning steel ball 115;

[0046] The knob 2 is connected to the front end of the cylindrical core 12 and cooperates with the front end of the locking strip 114 .

[0047] The knob 2 includes a positioning ring 21 concentrically sleeved on the outside of the front end of the cylindrical shell 11, a transparent cover 22 fixed at the rear end opening of the positioning ring 21 and sleeved and fixed on the outside of the front end of the cylindrical shell 11, a knob cover 25 concentrically sleeved on the outside of the front end of the positioning ring 21 and rotatable and repositionable and movable back and forth along the central axis of the positioning ring 21, and a retaining frame 23 movably arranged inside the positioning ring 21 to have the function of translation along the central axis of the positioning ring 21 and always maintain a forward elastic reset trend, the front side of the retaining frame 23 is fixed on the front inner wall of the knob cover 25, and the rear side of the retaining frame 23 is slidably fitted on the front outer wall of the transparent cover 22.

[0048] An eccentrically arranged snap-in block 234 is formed on the rear side of the retaining frame 23 toward the cylindrical core body 12. Correspondingly, a circular cavity 121 is formed at the front end of the cylindrical core body 12. A snap-in groove 1202 cooperating with the snap-in block 234 is formed on the lower inner wall of the circular cavity 121. The snap-in block 234 is slidably inserted in the snap-in groove 1202.

[0049] A limiting groove 235 is formed on the upper outer wall of the clamping block 234 . Correspondingly, a convex sleeve 1203 is formed forward on the bottom surface of the circular cavity 121 . A convex strip 1204 is formed downward on the lower side of the outer peripheral surface of the convex sleeve 1203 . The convex strip 1204 is slidably embedded in the limiting groove 235 .

[0050] An annular notch groove 211 is provided on the inner circumferential surface of the rear end opening of the positioning ring 21, and a plurality of lug seats 213 uniformly arranged at equal angles in the circumferential direction are formed between the inner circumferential surface of the annular notch groove 211 and the inner circumferential surface of the positioning ring 21. Correspondingly, the outer edge of the retaining frame 23 is formed with the same number of support blocks 231 uniformly arranged at equal angles in the circumferential direction toward the transparent cover 22. The plurality of support blocks 231 and the plurality of lug seats 213 are spaced apart and cooperate with each other. The transparent cover 22 is embedded in the opening of the annular notch groove 211 and fixed on the plurality of lug seats 213. The front outer wall of the transparent cover 22 is spaced a certain distance from the bottom surface of the annular notch groove 211.

[0051] A lap block 232 is formed outwardly at the outer edge of the end of each support block 231. Correspondingly, a stop groove 212 that cooperates with the lap block 232 is provided between the outer wall on the same side of each lug seat 213 and the bottom surface of the annular notch groove 211.

[0052] The knob 2 further includes an NFC sensor 24 which is fixed inside the knob cover 25 and located in front of the holder 23 and is connected to the control circuit board 13 by wireless signals.

[0053] A mounting notch 1206 is provided on the upper side of the outer peripheral surface of the rear end of the cylindrical core body 12, and a removable arc-shaped cover plate 18 is fixed in the mounting notch 1206. A guide hole 181 is provided in the arc-shaped cover plate 18. The upper end of the locking column 17 moves through the guide hole 181 and extends above the arc-shaped cover plate 18. A guide spherical surface 173 is formed on the upper end of the locking column 17.

[0054] A position sensing unit is also provided in the arc-shaped cover plate 18, and the position sensing unit includes an insulating seat sleeve 117 embedded in the arc-shaped cover plate 18, a first return spring 118 arranged inside the insulating seat sleeve 117, a sensing steel ball 119 movably arranged inside the upper opening of the insulating seat sleeve 117, and an arc-shaped sensing piece 1110 fixed to the upper side of the inner circumference of the cylindrical shell 11 and cooperating with the sensing steel ball 119. The first return spring 118 is always in a compressed state so that its upper and lower ends are respectively pressed against the sensing steel ball 119 and the corresponding contacts on the top of the control circuit board 13, so that the sensing steel ball 119 is rolled and pressed against the inner circumference of the cylindrical shell 11 and is electrically connected to the control circuit board 13 through the first return spring 118.

[0055] A seat block 1207 is formed inside the rear end of the cylindrical core body 12 and is located behind the linkage block 113. A mounting groove 1208 is provided on the top of the seat block 1207. The limiting column 15 is horizontally and rotatably connected to the bottom of the mounting groove 1207. A detachable reference block 16 is also fixed inside the opening of the mounting groove 1208. The locking column 17 is movably interspersed in the arc-shaped cover plate 18 and the reference block 16 to have the function of vertical movement up and down and always maintain an upward elastic reset tendency.

[0056] A first countersunk hole 233 is formed at the end of each support block 231, a second return spring 26 is formed at the bottom of each first countersunk hole 233, and a guide steel ball 27 is formed at the opening of each first countersunk hole 233. The second return spring 26 is always in a compressed state so that the guide steel ball 27 always rolls and presses against the front outer wall of the transparent cover 22.

[0057] A second countersunk hole 161 is provided at the top of the reference block 16, and the lower end of the locking column 17 is movably disposed in the second countersunk hole 161. A guide through hole 162 is provided between the center of the bottom surface of the second countersunk hole 161 and the bottom outer wall of the reference block 16. Correspondingly, a concentrically arranged guide column 171 is formed downward at the lower end of the locking column 17, and the guide column 171 is movably inserted in the guide through hole 162. A telescopic column 172 is concentrically arranged downward and cooperates with the concave cavity 151.

[0058] The third return spring 110 is sleeved outside the guide column 171 . The third return spring 110 is always in a compressed state so that its upper and lower ends are respectively pressed against the lower end of the locking column 17 and the bottom surface of the second countersunk hole 161 .

[0059] Two receiving columns 1135 are formed on the rear outer wall of the linkage block 113 toward the seat block 1207 and are arranged laterally and symmetrically distributed. Correspondingly, two third countersunk holes 1209 are formed on the front outer wall of the seat block 1207 and are symmetrically arranged and respectively cooperate with the two receiving columns 1135. The two receiving columns 1135 are respectively movably inserted into the two third countersunk holes 1209.

[0060] The two receiving columns 1135 are each sleeved with a transversely distributed fourth return spring 111, and each fourth return spring 111 is always in a compressed state so that its front and rear ends are respectively pressed against the rear outer wall of the linkage block 113 and the bottom surface of the third countersunk hole 1209.

[0061] An extension plate 1134 is formed on the front side of the linkage block 113 toward the locking strip 114 and is arranged transversely and cooperates with the rear end of the locking strip 114 .

[0062] A third limiting notch 1103 cooperating with the positioning steel ball 115 is further formed on the left inner wall of the front end opening of the cylindrical shell 11 .

[0063] A detachable tongue seat 116 is also fixed to the rear end of the cylindrical core body 12, and an orientation groove 1161 is provided on the front side of the tongue seat 116. Correspondingly, an orientation block 1205 that cooperates with the orientation groove 1161 is formed at the rear end of the cylindrical core body 12 toward the direction of the tongue seat 116, and the orientation block 1205 is embedded in the orientation groove 1161.

[0064] An arc-shaped notch cavity 1104 is also formed at the edge of the rear end opening of the cylindrical shell 11. Correspondingly, a limit block 1162 is formed forward on the front edge of the rotating tongue seat 116 and cooperates with the arc-shaped notch cavity 1104. The limit block 1162 is movably arranged in the arc-shaped notch cavity 1104 to play a rotation limiting role.

[0065] Working principle:

[0066] The lock body 1 is embedded and installed in the door body with the knob 2 located on one side of the door body. When installing the lock body 1, the lock body 1 must be rotated counterclockwise by a certain angle until the opening of the third limiting notch 1103 is vertically downward; then the end of the tongue seat 116 is connected to the lock tongue that is matched and installed in the door body.

[0067] In the locked state, the opening of the concave cavity 151 on the limiting column 15 is opposite to the lower end of the locking column 17, the end of the telescopic column 172 slides and fits on the outer circumference of the limiting column 15, and the upper end of the locking column 17 is embedded in the first limiting notch 1101; at the same time, the guide block 191 on the traction column 19 is located at the front end of the arc-shaped guide surface 1133 to force the linkage block 113 to be located at the rearmost position and compress the two fourth return springs 111; the positioning groove 1141 on the locking strip 114 is located behind the positioning steel ball 115, so that the positioning steel ball 115 is pushed to the outermost position by the bottom outer wall of the locking strip 114, so that the outer side of the positioning steel ball 115 is embedded in In the second limiting notch 1102; at this time, the cylindrical core 12 cannot rotate in the cylindrical shell 11; and the sensing steel ball 119 is pressed upward on the arc-shaped sensing plate 1110 under the rebound force of the first reset spring 118; each overlap block 232 is embedded in a corresponding anti-rotation groove 212 under the action of the self-reset function of the retaining frame 23, and each overlap block 232 is movably arranged between the front outer wall of the transparent cover 22 and the bottom surface of the annular notch groove 211 on the sensing steel ball 119 and the corresponding contact on the top of the control circuit board 13, so that it rolls and is pressed on the inner circumference of the cylindrical shell 11 and is electrically connected to the control circuit board 13 through the first reset spring 118.

[0068] When a mobile phone or other portable mobile device with a matching APP is placed close to the NFC sensor 24 located inside the knob cover 25, the NFC sensor 24 will receive the sensing signal from the mobile phone or other portable mobile device and automatically match. If the match is successful, the NFC sensor 24 will send an unlock signal to the control circuit board 13. When the control circuit board 13 receives the unlock signal, it will automatically generate an unlock command and send a power-on command to the battery 112. After receiving the power-on command, the battery 112 will connect the power of the micro motor 14 to rotate its rotating shaft. The above structure and principle are all prior art.

[0069] When the rotating shaft of the micro motor 14 rotates, it will drive the traction column 19 and the limiting column 15 in the clutch assembly to rotate synchronously counterclockwise; during the rotation of the limiting column 15, the cavity 151 gradually approaches the locking column 17 until the opening of the cavity 151 faces the telescopic column 172; at the same time, during the rotation of the traction column 19, the guide block 191 slides to its rear end along the arc-shaped guide surface 1133, and then the linkage block 113 gradually translates forward under the rebound force of the two fourth reset springs 111. Since the tendency of the linkage block 113 to move forward and reset is greater than the tendency of the locking strip 114 to move backward and reset, the locking strip 114 is pushed forward with the help of the extension plate 1134 until the opening of the positioning groove 1141 faces the positioning steel ball 115, thereby completing the automatic unlocking.

[0070] Next, hold the knob cover 25 by hand and press the knob cover 25 backward to drive the retaining frame 23 to move backward, so that each overlap block 232 comes out of a corresponding anti-rotation groove 212, until the end of each support block 231 is against the front outer wall of the transparent cover 22, and each overlap block 232 is now located between the bottom surface of the annular notch groove 211 and the front outer wall of the transparent cover 22; then, while maintaining the above-mentioned pressing state, turn the knob cover 25 clockwise by hand until each support block 231 is blocked by a corresponding lug seat 213, thereby effectively preventing over-tightening; during the rotation process, the retaining frame 23 will drive the cylindrical core 12 to rotate in the cylindrical shell 11 with the help of the mutual cooperation between the snap block 234 and the snap groove 1202 and the mutual cooperation between the convex strip 1204 and the limit groove 235.

[0071] When the cylindrical core 12 is subjected to a torsional moment from the retaining frame 23, the upper end of the locking column 17 and the outer side of the positioning steel ball 115 will be squeezed by the inner walls of the first limiting notch 1101 and the second limiting notch 1102 respectively. Since the opening of the concave cavity 151 is directly opposite to the locking column 17, a space is provided for the end of the telescopic column 172 to extend into, so that the locking column 17 can move toward the direction of the concave cavity 151 after being squeezed to make the upper end of the locking column 17 disengage from the first limiting notch 1101; at the same time, since the opening of the positioning groove 1141 is directly opposite to the positioning steel ball 115, a space is provided for the positioning steel ball 115 to retreat, so that the positioning steel ball 115 can move toward the positioning groove 1141 after being squeezed. The inner side of the positioning steel ball 115 is embedded in the second limiting notch 1102. At this point, the cylindrical core 12 can rotate in the cylindrical shell 11. The rotation of the cylindrical core 12 will drive the tongue seat 116 to rotate, and finally drive the lock tongue to rotate clockwise to unlock. The position sensing unit will rotate synchronously with the cylindrical shell 11, so that the sensing steel ball 119 in the position sensing unit will turn away from the arc-shaped sensing piece 1110. After the corresponding contact at the top of the control circuit board 13 cannot sense the arc-shaped sensing piece 1110 with the help of the first reset spring 118 and the sensing steel ball 119, an unlocking instruction will be sent to the indicator light or buzzer or other sound and light equipment installed inside the lock body 1 to prompt the user.

[0072] When each support block 231 is blocked by one of the adjacent lug seats 213, the cylindrical core 12 can no longer rotate. At this time, the positioning steel ball 115 is located above the opening of the third limiting notch 1103, and the positioning steel ball 115 will immediately fall by its own gravity so that its outer side automatically sinks into the third limiting notch 1103. At this time, you can release the knob cover 25, and the knob cover 25 will use its own rotation reset and forward translation reset functions and drive the cylindrical core 12 to rotate counterclockwise with the help of the retaining frame 23. The ball 115 automatically sinks into the third limiting notch 1103. Since the rotational reset force received by the cylindrical core 12 is smaller than the binding force between the positioning steel ball 115 and the third limiting notch 1103, the cylindrical core 12 is blocked from resetting and rotating. Since each overlap block 232 is located between the bottom surface of the annular notch groove 211 and the front outer wall of the transparent cover 22 at this time, the retaining frame 23 cannot move forward either, and therefore the knob cover 25 cannot translate forward and reset either. Finally, the knob cover 25 remains stationary after the hand is released, thereby automatically maintaining the unlocked state.

[0073] When re-locking, first turn the knob cover 25 counterclockwise by hand to apply a counterclockwise force to the cylindrical core 12 with the help of the retaining frame 23, so that the counterclockwise force on the cylindrical core 12 is greater than the binding force between the positioning steel ball 115 and the third limiting notch 1103, thereby forcing the positioning steel ball 115 to come out of the third limiting notch 1103, and then the knob cover 25 can be loosened. The knob cover 25 will drive the cylindrical core 12 to rotate counterclockwise with the help of its own rotation reset function with the help of the retaining frame 23 until each support block 231 is blocked by another adjacent lug seat 213, and the positioning steel ball 115 returns to the position opposite to the opening of the second limiting notch 1102, and the upper end of the locking column 17 rotates to the first limiting notch 1101 and extends into the first limiting notch with the help of the rebound force of the third reset spring 110. 1101, and each lap block 232 returns to the rear of the opening of a corresponding anti-rotation groove 212, after which the knob cover 25 drives the retaining frame 23 to move forward by virtue of its own forward translation and reset function, thereby causing each lap block 232 to be embedded in a corresponding anti-rotation groove 212; when the cylindrical core 12 rotates, it drives the lock tongue to reverse with the help of the tongue seat 116 to complete the locking; and the position sensing unit will rotate synchronously with the cylindrical shell 11, thereby causing the sensing steel ball 119 in the position sensing unit to roll and fit on the arc-shaped sensing sheet 1110 again, and the corresponding contact located at the top of the control circuit board 13 will sense the arc-shaped sensing sheet 1110 again with the help of the first reset spring 118 and the sensing steel ball 119, and will send a locked instruction to the indicator light or buzzer or other sound and light equipment installed inside the lock body 1 to prompt the user.

[0074] Finally, in the same way, a matching mobile phone or other portable mobile device is used to approach the NFC sensor 24 located inside the knob cover 25 to finally turn on the power of the micro motor 14 to reverse its rotation axis. When the rotation axis of the micro motor 14 reverses, it will drive the traction column 19 and the limit column 15 in the clutch assembly to rotate synchronously clockwise, so that the concave cavity 151 gradually moves away from the locking column 17 so that the end of the telescopic column 172 slides and fits on the outer peripheral surface of the limit column 15 again; at the same time, during the rotation of the traction column 19, the guide block 191 slides along the arc-shaped guide surface 1133 to its front end, thereby forcing the linkage block 113 to gradually translate backward, so that the extension plate 1134 leaves the rear end of the locking strip 114, and then the locking strip 114 moves backward with the help of its own backward movement and reset trend, so that the opening of the positioning groove 1141 moves to the rear of the positioning steel ball 115, and then the bottom outer wall of the locking strip 114 pushes the positioning steel ball 115 outward to make the outer side of the positioning steel ball 115 enter the second limiting notch 1102, thereby completing the automatic locking.

[0075] The present invention applies NFC technology to the cam lock to realize the intelligent transformation of the cam lock, so that the cam lock has automatic unlocking and locking functions to eliminate the use of mechanical keys, thereby simplifying the operation to facilitate use, and avoiding the phenomenon of easy forgetting, loss, duplication and mutual opening caused by the use of mechanical keys, thereby effectively improving safety; at the same time, it has an advanced degree of intelligence to meet the diverse usage needs of users; and the present invention also has an automatic and accurate resetting function with the help of a knob, which is simple and easy to operate, thereby reducing the difficulty of use and further facilitating use; in addition, the present invention has a compact structure to better balance the size, and thus has a large scope of application to be better applied to equipment such as electrical cabinets, cash registers, safes, file cabinets and display cabinets, so it has broad market prospects and is suitable for large-scale promotion.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An NFC self-resetting cam lock, characterized in that: It includes a lock body and a knob that cooperate with each other; The lock body comprises a cylindrical shell and a lock core rotatably arranged inside the cylindrical shell, the lock core comprises a cylindrical core body and a control circuit board, a battery and a clutch assembly arranged inside the cylindrical core body, and the battery is electrically connected to the control circuit board; The clutch assembly includes a micro motor fixed inside the cylindrical core and electrically connected to the control circuit board, a limit post laterally and rotatably connected inside the cylindrical core and concentrically fixed on the rotating shaft of the micro motor, and a locking post vertically located above the limit post and movably connected inside the cylindrical core to have the function of vertical movement up and down and always maintain an upward elastic reset tendency; A concave cavity is provided on the outer circumferential surface of the limiting column, which cooperates with the lower end of the locking column; a first limiting notch is provided on the upper inner wall of the rear end opening of the cylindrical shell, and the upper end of the locking column movably extends to the outside of the cylindrical core and cooperates with the first limiting notch; The clutch assembly also includes a traction column arranged between the micro-motor rotating shaft and the limit column, a linkage block movably connected to the inside of the cylindrical core body so as to have a forward and backward translation function and always maintain a forward elastic reset tendency and located below the traction column, a locking strip transversely arranged in front of the linkage block and movably connected to the inside of the cylindrical core body so as to have a forward and backward translation function and always maintain a backward elastic reset tendency, and a positioning steel ball movably embedded in the lower side of the cylindrical core body and located below the locking strip, and the linkage block has a forward movement and reset tendency greater than the backward movement and reset tendency of the locking strip; The rear end of the traction column is formed with a concentrically arranged protrusion in the direction of the limiting column. Correspondingly, the front end of the limiting column is formed with two clamping plates diagonally arranged on both sides of the central axis of the limiting column in the direction of the traction column and both cooperate with the protrusion, and the protrusion is inserted between the two clamping plates; The top of the linkage block is provided with an arc-shaped rotating groove, the inner wall of the arc-shaped rotating groove is provided with a stopper upwardly formed, the front side of the stopper is provided with an arc-shaped guiding surface, the outer peripheral surface of the traction column is provided with a guide block outwardly formed, the end of the guide block cooperates with the inner wall of the arc-shaped rotating groove, and the rear outer wall of the guide block cooperates with the arc-shaped guiding surface; A positioning groove cooperating with the positioning steel ball is provided at the bottom of the locking strip, a second limiting notch cooperating with the positioning steel ball is provided on the lower inner wall at the front end opening of the cylindrical shell; a third limiting notch cooperating with the positioning steel ball is also provided on the left inner wall at the front end opening of the cylindrical shell; The knob is connected to the front end of the cylindrical core and cooperates with the front end of the locking strip.

2. The NFC self-resetting cam lock according to claim 1, characterized in that: The knob includes a positioning ring concentrically sleeved on the outside of the front end of the cylindrical shell, a transparent cover fixed at the rear end opening of the positioning ring and sleeved and fixed on the outside of the front end of the cylindrical shell, a knob cover concentrically sleeved on the outside of the front end of the positioning ring and rotatable and repositionable and movable back and forth along the central axis of the positioning ring, and a retaining frame movably arranged inside the positioning ring to have the function of translation along the central axis of the positioning ring and always maintain a forward elastic reset trend, the front side of the retaining frame is fixed on the front inner wall of the knob cover, and the rear side of the retaining frame is slidably fitted on the front outer wall of the transparent cover; the knob also includes an NFC sensor fixed inside the knob cover and located in front of the retaining frame and wirelessly connected to the control circuit board signal.

3. The NFC self-resetting cam lock according to claim 2, characterized in that: An eccentrically arranged clamping block is formed on the rear side of the retaining frame toward the direction of the cylindrical core body, and correspondingly, a circular concave cavity is formed at the front end of the cylindrical core body, and a clamping groove that cooperates with the clamping block is formed on the lower inner wall of the circular concave cavity, and the clamping block is slidably inserted in the clamping groove; a limiting groove is formed on the upper outer wall of the clamping block, and correspondingly, a convex sleeve is formed forward on the bottom surface of the circular concave cavity, and a convex strip is formed downward on the lower side of the outer peripheral surface of the convex sleeve, and the convex strip is slidably embedded in the limiting groove.

4. The NFC self-resetting cam lock according to claim 3, characterized in that: An annular notch groove is provided on the inner circumferential surface of the rear end opening of the positioning ring, and a plurality of lug seats uniformly arranged at equal angles in the circumferential direction are formed between the inner circumferential surface of the annular notch groove and the inner circumferential surface of the positioning ring. Correspondingly, the outer edge of the retaining frame is formed with the same number of support blocks uniformly arranged at equal angles in the circumferential direction toward the direction of the transparent cover, and the plurality of support blocks and the plurality of lug seats are spaced apart and cooperate with each other, the transparent cover is embedded in the opening of the annular notch groove and fixed on the plurality of lug seats, and the front outer wall of the transparent cover is spaced a certain distance from the bottom surface of the annular notch groove.

5. The NFC self-resetting cam lock according to claim 4, characterized in that: A lap block is formed outwardly on the outer edge of the end of each support block, and correspondingly, a rotation-stopping groove that cooperates with the lap block is opened between the outer wall on the same side of each lug seat and the bottom surface of the annular notch groove.

6. The NFC self-resetting cam lock according to claim 1, characterized in that: A mounting notch is provided on the upper side of the outer peripheral surface of the rear end of the cylindrical core body, and a detachable arc-shaped cover plate is fixed in the mounting notch. A guide hole is provided in the arc-shaped cover plate, and the upper end of the locking column moves through the guide hole and extends above the arc-shaped cover plate, and a guide spherical surface is formed on the upper end of the locking column.

7. The NFC self-resetting cam lock according to claim 6, characterized in that: A position sensing unit is also provided in the arc-shaped cover plate, and the position sensing unit includes an insulating seat sleeve embedded in the arc-shaped cover plate, a first return spring arranged inside the insulating seat sleeve, a sensing steel ball movably arranged inside the opening of the upper end of the insulating seat sleeve, and an arc-shaped sensing sheet fixed on the upper side of the inner circumference of the cylindrical shell and cooperating with the sensing steel ball. The first return spring is always in a compressed state so that its upper and lower ends are respectively pressed against the sensing steel ball and the corresponding contacts on the top of the control circuit board, thereby causing the sensing steel ball to roll and press against the inner circumference of the cylindrical shell and be electrically connected to the control circuit board through the first return spring.

8. The NFC self-resetting cam lock according to claim 6, characterized in that: A seat block located behind the linkage block is formed inside the rear end of the cylindrical core body, a mounting groove is opened on the top of the seat block, the limit column is horizontally and rotatably connected to the bottom of the mounting groove, a detachable reference block is also fixed inside the opening of the mounting groove, and the locking column is movably inserted in the arc-shaped cover plate and the reference block to have the function of vertical movement up and down and always maintain an upward elastic reset tendency.

9. The NFC self-resetting cam lock according to claim 8, characterized in that: A second countersunk hole is provided on the top of the reference block, and the lower end of the locking column is movably arranged in the second countersunk hole. A guide through hole is provided between the center of the bottom surface of the second countersunk hole and the bottom outer wall of the reference block. Correspondingly, a concentrically arranged guide column is formed downward at the lower end of the locking column, and the guide column is movably inserted in the guide through hole, and a telescopic column is concentrically arranged downward at the end of the guide column and cooperates with the concave cavity; a third return spring is also sleeved on the outside of the guide column, and the third return spring is always in a compressed state so that its upper and lower ends are respectively pressed against the lower end of the locking column and the bottom surface of the second countersunk hole.

10. The NFC self-resetting cam lock according to claim 8, characterized in that: Two receiving columns are laterally arranged and symmetrically distributed on the left and right sides of the linkage block, and are formed on the rear outer wall of the linkage block toward the direction of the seat block. Correspondingly, two third countersunk holes are symmetrically arranged on the left and right sides and respectively cooperate with the two receiving columns, and the two receiving columns are movably inserted into the two third countersunk holes respectively; a laterally distributed fourth return spring is also sleeved on the outside of the two receiving columns, and each of the fourth return springs is always in a compressed state so that its front and rear ends are respectively pressed against the rear outer wall of the linkage block and the bottom surface of the third countersunk hole; an extension plate is laterally arranged on the front side of the linkage block toward the direction of the locking strip and cooperates with the rear end of the locking strip.

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