39results about How to "Good anti-theft performance" patented technology

The invention relates to a tower frame type combined driving oil extractor, which comprises a tower frame, a power system, a driving system, a control system, a balance weight box, a balance weight pulling rope, a driving rope, a polished rod eye and a guide wheel mechanism, wherein the driving system transmits power to a first transmission shaft after first reduction through a belt, a chain or combination of the belt and the chain, and drives a second transmission shaft after second reduction through a pair of gears, to drive the driving rope and the balance weight pulling rope which are rewound and fixed on a rope pulley, thereby a pumping rod and the balance weight box move up and down to complete operation of oil extraction. The driving system of the tower frame type combined driving oil extractor adopts the combined transmission form of gears and belts; the balance weight box adopts main and auxiliary multilevel adjustable balance weight; and the guide wheel is fixed on an operating platform through a rotating shaft, so that the tower frame type combined driving oil extractor has the advantages of simple structure, low cost, small number of fault points, convenient maintenance, suitability for various operating conditions of oil extraction, high transmission efficiency, low energy consumption and so on.

This invention discloses an anti-theft inspection well lid, comprising a well lid and a locking mechanism arranged at back of the well lid; the locking mechanism consists of a lock body and lock bars on two sides of the lock body; the lock body is set with a lock core which is in linkage connection with the lock bars via a connection device; the lock core is set with a lock hole of shaped structure; a key matched with the shaped structure of the lock hole is embedded into the lock hole, and is applied to opening/closing the locking mechanism. Accordingly, this invention is convenient for operation, which can only be opened using dedicated key, thereby achieving excellent anti-theft performance, reducing accidents due to missing of well lid, and avoiding unnecessary material damage.

The invention discloses an all-directional wedge-shaped pretension sound-proof well lid, comprising a round well base and a cover board. Three locations of the well base internal ring are uniformly set with bidirectional wedge-shaped convex plates convex towards the central direction of the well base. The back of the location of the cover board corresponding to the well base convex plates is set with bidirectional wedge-shaped projections. Each bidirectional wedge-shaped projection is connected with the cover board by an elastic member. The bidirectional wedge-shaped convex plates of the well base have smaller upper slope and larger lower slope. The bidirectional wedge-shaped projections of the cover board have smaller lower slope and larger upper slope. The upsides of the bidirectional wedge-shaped projections of the cover board are compatible with the lower sides of bidirectional wedge-shaped convex plates of the well base. And the cover board is fixed firmly on the well base by the pretension from circumferential and vertical directions. The invention can prevent the cover board from jumping and displacement when being rolled and impacted by automobile and avoid the impact noise of the cover board to the well base.

The invention provides a reversed-T-shaped anti-theft device and method of an all-in-one equipment cabinet. The reversed-T-shaped anti-theft device comprises a base, a latch, an upper spring bolt mechanism and a lower spring bolt mechanism, wherein the upper spring bolt mechanism and the lower spring bolt mechanism are arranged on the base. The upper spring bolt mechanism and the lower spring boltmechanism each at least comprise a telescopic spring bolt, a reset spring and a connection rod. The tail portion of each telescopic spring bolt is provided with the corresponding connection rod, andeach reset spring is connected to the corresponding connection rod in a sleeving manner. The free end of each reset spring is fixedly connected to the corresponding telescopic spring bolt, and the fixed end of each reset spring is fixed to the base so as to provide reset force when the corresponding telescopic spring bolt is stressed and shrinks. The base is provided with a gear. The gear is rotationally connected with the base through an anti-theft bolt. The telescopic spring bolts of the upper spring bolt mechanism and the lower spring bolt mechanism are both provided with teeth, the telescopic spring bolts are meshed with the two sides of the gear and are in linkage, and therefore when the gear rotates, the telescopic spring bolts extend out or retract relative to the base. The reversed-T-shaped anti-theft device is convenient to use and good in anti-theft performance.

The invention which relates to a car theftproof main brake control device comprises a slip-core check valve and a cam-type double stable state trigger which are connected together; a through hole of the cam-type double stable state trigger is provided with a triggering shaft; the middle part of the triggering shaft is provided with a circumferential groove; a control shaft which is controlled by an edge cam and can be inserted into the groove is arranged between the top side of the trigger body and the through hole; the edge cam is driven to rotate by a push-and-pull type electromagnet through a rack, a gear and a driving ratchet; a retaining ratchet is arranged between the edge cam and the trigger body; the cam-type double stable state trigger can be provided with a stable triggering state and a non-triggering state. A slide core type one way valve is provided with a matching valve base and a valve core, and a valve core spiral spring which is arranged between the valve core and a valve rod can be the one way valve when closed. The car theftproof main brake control device which combines with a remote control switch in the car can cause the main brake of the car to be in a brake state or discharge the brake state of the main brake of the car; when the car is started, under the condition that the main brake is operated, the car can hardly overcome the friction of the main brake to run and the car theftproof device is good in theftproof performance.

The invention discloses a double-verification fingerprint lock. The double-verification fingerprint lock comprises a lock body, a lock box and a fixing block, a rotating shaft is arranged in the middle of one side wall of the lock body, a rotating block is arranged at one end of the rotating shaft, a spring bolt is arranged in the middle of the other side wall of the lock body, a driving gear is arranged in the middle of the inner upper end of the lock body, and a rack is arranged at the position, close to the driving gear, of the upper end of the spring bolt. The double-verification fingerprint lock has the beneficial effects that the dual verification function can be realized by arranging a fingerprint identifier, password keys and a controller, the anti-theft performance is good, and the reliability of the fingerprint lock use can be ensured; a camera, an alarm and a loudspeaker are arranged so that the security and protection monitoring function can be realized, a monitoring devicedoes not need to be additionally arranged, then the cost of security and protection monitoring can be effectively saved, and the usability of the fingerprint lock is improved; and a photosensitive sensor is arrange so that automatic opening and closing of a bulb can be realized according to the intensity of light rays, and then the convenience of unlocking can be improved under poor lighting conditions.

The invention discloses a key cylinder. The key cylinder comprises a lock case, a cylinder core and a key. A keyhole is formed on the cylinder core, a front locking device is arranged on the top of the lock case and the cylinder core, and a side locking device is mounted on the side face of the lock case and the cylinder core; the side locking device comprises side ball pressure springs, side balls, pressure springs of a transverse sheet and the transverse sheet; key sliding grooves where a part of a key slides are formed on the side balls; transverse sheet sliding grooves where a part of the transverse sheet slides are formed under the side walls; a tooth pattern which is matched with the front locking device for unlocking is arranged on a surface of the key, a raised line which is matched with the key sliding grooves of all side balls and pushes to side balls to move left and right is arranged on the other surface of the key, and the raised line protrudes out of the surfaces of the side balls and is arranged in an extended manner along the length direction of the key. The key cylinder and the key disclosed by the invention have the advantages of simple structure and good stir-up and burglar resistance.

The invention relates to a safe lock device of a refrigeratory, which is mainly used for solving the problems that an existing openable door lock in the refrigeratory is complex in structure, is high in cost, and is poor in burglar prevention. The safe lock device is characterized in that a rotation shaft (5) is installed in a rotation shaft base (8) penetrating through a door body (7); one end of a buckling ring (6) is hinged with a buckle hand (4), and the other end of the buckling ring (6) sleeves a bending body (9) of the rotation shaft (5); after the rotation shaft (5) rotates for a certain angle, the buckling ring (6) can slide off from the bending body (9). For the safe lock device of the refrigeratory, the buckling ring can be separated away from the bending body on the rotation shaft after a handle is rotated by 180 degrees, and then a door of the refrigeratory is opened; the safe lock device has the characteristics of simple and exquisite structure, low cost, and good anti-theft performance.

The invention provides a mobile toolbox, and belongs to the technical field of transportation. The mobile toolbox solves the problems that a current toolbox is easy to damage, and the anti-theft performance is poor. The mobile toolbox comprises a box body which is in the shape of a square thin-walled container, a box cover which is hinged to the box body and locked by the box body and a locking device. One end of the locking device is provided with a handle. The handle is arranged on the box cover and protrudes out of the box cover. The other end of the locking device is hinged to the box body. The handle rotates and can drive the box cover to move, so that locking on the box body and the box cover is disengaged, and the box cover can be opened. The mobile toolbox has the advantages of being good in anti-theft performance, and convenient to use.

The invention discloses a remote control mechanical lock cylinder. The lock cylinder comprises a remote control key device and a mechanical lock cylinder device. The lock cylinder comprises a lock cylinder body, a lock liner, hollow beads, a clamping piece bead, a clamping pin strip, blades, springs, an outer bottom bead, a shifting strip, a key and a magnetic attraction column. The remote control mechanical lock cylinder is reasonable in structure, convenient to use, practical, good in anti-theft performance, durable, safe, reliable, easy to mount, low in cost and wide in application range. A plurality of closed parts are additionally arranged in the lock cylinder, the difficult of opening the lock cylinder is increased, and the property is protected against loss more effectively; and the lock cylinder is suitable for building residences and villa residences.

The invention provides a gate lock regulated and controlled by a mobile phone. A single chip microcomputer is arranged in the gate lock. One end of the single chip microcomputer is connected with a gate lock demodulation circuit and a mobile phone signal circuit, and the other end of the single chip microcomputer is connected with a power amplification circuit and a mechanical execution component. The end tip of the single chip microcomputer is connected with a secret key preset and reset circuit. The single chip microcomputer is further connected with a warning circuit. When the gate lock regulated and controlled by the mobile phone is used after being installed, the mobile phone can be used to be aimed at a gate lock signal reception circuit to issue a password command, so that the gate lock can be unlocked. Due to adoption of scientific combination of the gate lock and the general mobile phone, usage of the gate lock is very convenient. Due to the fact that the mobile phone can be encrypted as needed, the antitheft effect is good.

The invention relates to the technical field of hardware, in particular to an anti-knocking intelligent lock clutch structure. The clutch structure comprises a clutch clamping cover, a clutch part isarranged on the top of the clutch clamping cover, a motor fixed shell is arranged on the top of the clutch part, a motor is arranged in the motor fixed shell, the clutch part comprises a clutch pin base, a positioning ring is tightly welded to the top of the clutch pin base, a cross rail is arranged in the clutch pin base, the outer end of the cross rail penetrates through the outer wall of the clutch pin base, a clutch pin is in sliding connection into the cross rail, the top of one end of the clutch pin is tightly welded with a convex block, and a connecting base is arranged in the positioning ring. According to the design, through the rotatably-designed clutch part, the risk of clutch pin falling during knocking of a lawbreaker can be avoided, safety is improved, the anti-theft propertyis good, all parts are easy to mount, replacing time during damage of an inner structure of a door lock can be saved, during knocking, inner parts are compact in connection and cannot deviate, and the service life of the clutch structure is prolonged.

The invention relates to a bolt part of a fastener, namely a flatheaded anti-theft breaking bolt composed of inner bolt and outer nut, characterized in that: it is set with a fastening inner bolt, namely in shape, a flatheaded conical cap bolt composed of two sections of screw bolts concentric but different in diameter, the cap of the inner bolt is inserted in the conical groove of the outer nut, the thread of the upper thicker section is a fine-pitch levogyrate light thread matching with the outer nut, and the outer nut is a short-lived nut only playing a role of driving the inner bolt to fasten and is of a shape of hex nut, and the middle hole thread of the outer nut is a fine-pitch levogyrate female thread which matches with the upper section of the inner bolt and whose locking intensity is lower than that of the inner bolt and the supporting locked net. In use, firstly placing the inner bolt in the outer nut and screwing closely into a set of combined bolt which is placed in the locked net and then screwed by wrench, and when reaching the rated torque, the thread of the short-lived nut breaks the sliding filament to make it slide only in the periphery of the inner bolt so as to be unable to demount the inner fastening bolt by routine means and tool any more.

The invention provides an anti-filching tablet personal computer. The anti-filching tablet personal computer comprises a body and further comprises a fingerprint module, a control module, a single-chip microcomputer, a mode switching module and a buzzer. The fingerprint module comprises a fingerprint sensor, a fingerprint storage unit, a fingerprint comparison unit, a fingerprint collection unit and a fingerprint collection button, wherein the fingerprint comparison unit and the fingerprint collection unit are electrically connected with the fingerprint storage unit, and the fingerprint collection button is embedded in the side wall of the body. The control module comprises a timing unit and a pressure sensor. The mode switching module comprises a mode switching button, a timing unit and a time input unit. The fingerprint sensor and the pressure sensor are adjacently arranged on a frame of the body. A power supply unit supplies power to the fingerprint module, the control module, the single-chip microcomputer, the mode switching module and the buzzer. Startup, shutdown and unlocking are conducted through fingerprint verification, the anti-theft performance is good, the power supply management is conducted on different modules, the electrical energy saving is achieved, and functions are diverse.

The invention discloses a comprehensive monitoring device of an overhead line. The comprehensive monitoring device of the overhead line takes electricity through the high voltage and integrates the functions of circuit live display, short-circuit fault indication, load current detection, and ultrasonic bird repelling. The comprehensive monitoring device of the overhead line comprises a micro controller unit which is connected with a B-phase power line, a load current sensor, a short-circuit current sensor I and a short-circuit current sensor II, wherein electro-magnetic induction exists between the load current sensor and the B-phase power line, electro-magnetic induction exists between an A-phase power line and the short-circuit current sensor I, electro-magnetic induction exists between a C-phase power line and the short-circuit current sensor II, the load current sensor is electrically connected with the MCU, the short-circuit current sensor I is electrically connected with an LED light source I, the short-circuit current sensor II is electrically connected with an LED light source II, and the LED light source I and the LED light source II are in optical coupling with the MCU. The comprehensive monitoring device of the overhead line further comprises a high-voltage capacitor I which is electrically connected with the A-phase power line, a high-voltage capacitor II which is electrically connected with the C-phase power line, and a direct-current power supply circuit which is electrically connected with the high-voltage capacitor I and the high-voltage capacitor II, wherein the direct-current power supply circuit is electrically connected with the MCU.

The invention discloses a method for connection locking of a building component. The method includes five steps, and the connection locking is performed on the building component by utilizing lockingconnecting pieces. The invention also discloses a structure of the method of the connection locking of the building component. The structure includes the building component and the locking connectingpieces; the building component includes a window frame, and at least four limit holes are symmetrically disposed on the side wall of the window frame; and each set of the locking connecting pieces comprises bolts, a mounting plate, a cylinder body, a limit rod, a guiding block and a spring, and a cylindrical plug. The method and the structure are simple in step, are convenient to construct, are low in construction requirements for construction personnel, are beneficial to smooth development of a construction project, are good in anti-theft performance, and are convenient to install, a preparedprotective layer can effectively increase anti-corrosion, anti-adhesion and anti-aging performance of the window frame, it is especially important that the amount of dust falling on the surface of the window frame during a usage process is reduced, thereby reducing the cleaning frequency of the window frame, and the work intensity for cleaning workers is reduced.

The invention discloses an anti-theft bolt set for wind power. The anti-theft bolt set comprises a bolt head, a screw rod, a nut, an anti-theft sleeve, a first locking part and a second locking part;the screw rod is fixed at the bottom of the bolt head, the nut is screwed on the screw rod, the nut is in a regular polygon shape, the anti-theft sleeve is a sleeve-shaped body with an opening at theupper end, the anti-theft sleeve is arranged on the nut in a sleeved mode, a central groove is formed in the anti-theft sleeve, the central groove is matched with the nut, the first locking part is fixed in the central groove, the second locking part matched with the first locking part is fixed at the tail end of the screw rod, and the anti-theft sleeve is fixed with the screw rod through the first locking part and the second locking part. According to anti-theft bolt set for the wind power, the anti-theft sleeve is matched with the nut, so that the bolt set has good anti-theft performance andis not easy to be stole.

The invention belongs to the technical field of locks, and particularly relates to an angle spring lock. The angle spring lock comprises a lock shell, a lock cylinder and a key. The lock cylinder is provided with a key hole. The upper side of the key hole is provided with an angle lower spring. Both the height level difference and the angle level difference are set for the angle lower spring. The lower side of the key hole is further provided with a snake slot spring. According to technical opening, the height position of the angle lower spring needs to be positioned, and meanwhile the angle position of the angle lower spring also needs to be positioned. Only when the two positions are well positioned at the same time, can the angle lower spring be in an opened state. Meanwhile, the snake slot spring also needs to be shifted to the accurate position, and then the lock can be opened. Due to the fact that different moving directions and different angle rotating directions are needed for opening, the technical opening difficulty is quite high, accordingly, the anti-theft performance is better, and safety is higher.

The invention discloses a passive-type low-energy-consumption steel composite fireproof door. The door comprises a door frame (1) and a door leaf (2), a fireproof door lock (3) is arranged on the doorleaf (2), and the door leaf (2) is connected with the door frame (1) through a hinge (4); the door is characterized in that a bridge cutoff structure is arranged on the step-shaped matching face of the door frame (1) and the door leaf (2), a blocking seal strip (5) is arranged on the step-shaped matching face of the door leaf (2), the door leaf (2) is composed of a fireproof heat preservation plate and a wrapping steel plate, the door frame (1) is composed of a base material (6), a high-temperature-resistant layer (7) and a wrapping steel plate, and the high-temperature-resistant layer (7) covers the indoor surface of the base material (6) and the contact surface of the base material (6) and a building. The passive-type low-energy-consumption steel composite fireproof door has comprehensive overall performance of excellent heat preservation performance, safety anti-theft performance and high-temperature-resistant waterproof performance.

The invention provides a tablet computer with a fingerprint unlocking function. The tablet computer comprises a body and an unlocking mechanism. A power switch is arranged on a frame of the body and is connected with a power module in the body by a circuit, electric modules in the body can be powered by the power module, and the unlocking mechanism comprises a fingerprint module, an operation locking module, a timing module, a buzzer and a single chip microcomputer; the fingerprint module, the operation locking module, the timing module, the buzzer and the power module are respectively connected with the single chip microcomputer by circuits; the fingerprint module comprises a fingerprint sensor, a fingerprint storage unit, a fingerprint comparison unit, a fingerprint recording and acquiring unit and a fingerprint recording and acquiring button, the fingerprint comparison unit and the fingerprint recording and acquiring unit are respectively electrically connected with the fingerprint storage unit, the fingerprint recording and acquiring button is embedded on a side wall of the body, and the fingerprint sensor is embedded in the frame of the body; the unlocking mechanism further can be powered by the power module. The tablet computer has the advantages that fingerprints can be verified, so that an operating system in the body can be unlocked, and the tablet computer is good in stealing preventive performance.

The invention relates to an anti-pulling and anti-theft lock head which comprises a lock body and a lock core arranged on the lock body, and is characterized in that an outer convex ring is arranged at the back part of the lock core, a through hole matched with the lock core is arranged on the lock body, the lock core is arranged in the through hole, and a stop block is arranged on the lock body at the end which corresponds to the outer convex ring of the lock core. Compared with the prior art, the anti-pulling and anti-theft lock head has the advantages of preventing a thief from pulling out the lock core from a lock core hole of the lock body through a key port by using a special tool (such as a tool with a barb) and having good anti-theft performance.

A bold anti-theft lock-core is belong to a new variety, which includes locking guts block (1), inter locking guts (3), spring pellets (4), on pellets (6), under the pellets (7) and wheel (9), its features is the core also include locking of outside (2),even bead (5) and the reduction of spring (8), Foreign lock guts (2) casing shape, it is installed in lock guts Block (1) and interlocking guts (3) between even bead (5) oblate shape, , below the spherical, even bead(5) in the installation of bullet - (6) with bullet-spring (4) between interlocking guts (3) tail attacks, jackets with reduction spring (8), reduction spring (8) - lock outside pressure (2) flange (21), the CORE locking in the state, WHEEL (9) allocated plate (91) at Bolt allocated groove, it has been locked with CORE compared its features : CORE is in the locked state, within and outside lock bile can be locked together rotation, the thief used a key or non - bundled tools could not be opened, with an electric drill can not be undermined, anti-theft good performance.

The invention discloses a buckle type anti-counterfeiting seal which comprises an electricity meter upper cover, a seal base and a seal cover which are provided with anti-counterfeiting chips, wherein the electricity meter upper cover, the seal base and the seal cover are arranged from top to bottom, a fixing mechanism for fixing the seal base is arranged on the corner of the electricity meter upper cover, a plurality of first buckle holes are arranged in the fixing mechanism, a cavity is arranged on the middle of the seal base, second buckle holes are arranged in the cavity and correspond to the first buckle holes, a spring sleeve is embedded in the cavity, a plurality of inclined inverted buckles are arranged on the spring sleeve and penetrate through the first buckle holes and the second buckle holes in corresponding positions to ensure that the seal base and the electricity meter upper cover cannot be separated so that sealing is completed. The buckle type anti-counterfeiting seal has the advantages of simple and rapid process steps, capability of realizing automatic production, good anti-theft performance, low cost, no need of using a lead seal, no influence to the health of workers, and good application prospect.

The invention discloses a four-rail blade lock, and mainly relates to the field of safety lock technical equipment. The four-rail blade lock comprises a lock cylinder and a key, the lock cylinder comprises a lock body, a lock liner is arranged in the lock body, multiple blade holes are formed in the lock liner, four blades are arranged in each blade hole, springs are arranged under the blades, disturbance side column containing grooves are formed below the blade holes, disturbance side columns are arranged in the disturbance side column containing grooves, a locking side column containing groove is formed in the tops of the blade holes, and a locking side column is arranged in the locking side column containing groove; three groups of front face teeth are arranged on the front face of the key, and a group of back face teeth are arranged on the back face of the key. The four-rail blade lock has the advantages that four blades are installed in each blade hole, it can be avoided that the blades are poked into the unlocking position through an unlocking technology, and safety coefficient can be increased; the teeth on the key can be combined in many modes, the lock is prevented from being unlocked by a similar key, and the anti-theft performance is good.

The invention provides a fingerprint anti-theft tablet personal computer. The fingerprint anti-theft tablet personal computer comprises a main body, and further comprises an unlocking mechanism, wherein a power switch is arranged on the frame of the main body; the power switch is in circuit connection with a power module in the main body and supplies power to an electric module in the main body; the unlocking mechanism comprises a fingerprint module, an operation locking module, a timing module, a remote alarm module and a single chip; the fingerprint module, the operation locking module, the timing module, the remote alarm module and the power module are in circuit connection with the single chip respectively; the fingerprint module comprises a fingerprint sensor, a fingerprint storage unit, a fingerprint comparison unit, a fingerprint recording unit and a fingerprint recording button; the fingerprint comparison unit and the fingerprint recording unit are electrically connected with the fingerprint storage unit respectively; the fingerprint recording button is embedded in the side wall of the main body; the fingerprint sensor is embedded in the frame of the main body; the power module also supplies power to the unlocking mechanism. According to the fingerprint anti-theft tablet personal computer, an operation system in the main body is unlocked through fingerprint verification, so that the anti-theft property is good.

The invention discloses an automobile anti-theft alarm system and method. The system comprises a data collection unit which is disposed on an automobile and is used for collecting anti-theft data, a data identification unit which is in signal connection with the data collection unit, a control unit which is in signal connection with the data identification unit, an alarm unit which is in signal connection with the control unit and used for receiving signals of the control unit and sending out alarm signals, and a power supply unit which is electrically connected with the data collection unit,the data identification unit, the control unit and the alarm unit and supplies power to the data collection unit, the data identification unit, the control unit and the alarm unit. The system is advantaged in that through a fingerprint and sound dual-unlocking system, anti-theft performance of an automobile is better, the safety level is higher, and property losses caused by password leakage can be effectively avoided.

The invention discloses an antitheft welding-free steel-tube fence comprising horizontal steel tubes and vertical steel tubes. The horizontal steel tubes and the vertical steel tubes are connected through elastic fasteners which are arranged in the vertical steel tubes respectively. Each elastic fastener comprises a fixing plate, a first protrusion block and a second protrusion block, wherein the first protrusion block and the second protrusion block are arranged at two ends of the front face of the fixing plate. The vertical steel tubes are provided with first open holes and second open holes corresponding to the first protrusion blocks and the second protrusion blocks. The first protrusion blocks and the second protrusion blocks cling to the inner walls of the horizontal steel tubes. Two elastic arc-shaped plates extending outwardly are arranged on the reverse side of each fixing plate symmetrically. The antitheft welding-free steel-tube fence has the advantages that the antitheft welding-free steel-tube fence is mounted rapidly and conveniently and has high durability; the antitheft welding-free steel-tube fence is locked automatically after being mounted, thereby being difficult to damage and high in safety protection and theft prevention performance; welding and bolt connection are not needed, and accordingly, material and labor costs are reduced.

The invention provides an anti-theft lock core. The anti-theft lock core comprises a lock body, a lock plunger, a spring, an upper latch, a lower latch and a rotary rod. A lock cylinder is arranged between the lock body and the lock bolt and the rotary rod is connected with the lock cylinder; a middle latch is arranged between the upper latch and the lower latch and the lock bolt is provided with a key groove; a plurality of spring latches are arranged in the lock bolt; and corresponding through holes are arranged among the lock body, the lock bolt and the lock cylinder and the latches and the spring can freely move in the through holes. The anti-theft lock core has the advantages that the anti-theft performance is good; and the lock cannot be opened under the condition of not inserting a key and the lock cannot be opened by using a special tool such as a 'universal key' and the like to tentatively twist a lock core shaft. In addition, two parts including the lock cylinder and the latch are additionally arranged on the basis of the traditional common lock core and no complicated mechanical structures are arranged, so that the anti-theft lock core is easy to implement and is suitable for various locks.

An antitheft lock head with stepped-shaped inner bolt holes comprises a lock core, a lock core sleeve and a bolt mechanism. The lock core is rotationally installed in a lock core hole of the lock core sleeve. The bolt mechanism comprises a left inner plug, a left inner spring, a left inner bolt, a right inner plug, a right inner spring, a right inner bolt, an inner locking bolt, outer locking bolts, an outer spring and an outer plug. The lock core is totally provided with N bolt holes, wherein X inner bolt holes are the stepped holes, Y inner bolt holes are straight holes, X plus Y is N, X is larger than or equal to 1, and N is larger than or equal to 3. The bilateral clearance between the large diameter section of each stepped hole and the corresponding outer locking bolt is A, the bilateral clearance between each straight hole and the corresponding outer locking bolt is B, and A is larger than B. The bilateral clearances of the inner bolt holes and the outer locking bolts are not consistent and different in size, during lock theft, the parts with smaller clearances need to be opened first, then the parts with larger clearances are opened, the lock theft difficulty is increased, and antitheft performance is promoted.

The present invention discloses one kind of electronic induction anti-theft device for electric bicycle. The electronic induction anti-theft device includes one host unit mounted in a plastic casing on the electric bicycle for the on-off of the main power source and one matched slave unit for carrying about. The host unit has signal emitting window, signal receiving window and host CPU chip with control end connected to the main power source controller, phonetic chip and sound alarm controller. The slave unit has signal emitting window, signal receiving window and slave CPU chip. The present invention has excellent anti-theft performance and other advantages.