Electric locking mechanism

The present invention discloses a motored locking mechanism, comprising a motor, two groups of transmission mechanisms that are arranged mirror symmetrically and two output components that are arranged mirror symmetrically, wherein the transmission mechanisms transfer power of the motor to the output components, wherein the motor is provided at an output end with a driving gear, wherein the driving gear is attached to an output shaft of the motor. The transmission mechanisms on two mirror sides are controlled by a common motor so the volume is smaller with a simpler structure. Regarding both sides of the lock, the transmission mechanism of one side is driven wherein the other side not. Thus, two unrelated systems are driven by a single motor.

TECHNICAL FIELD

The present invention relates to the field of locks, particularly, motored locking mechanisms.

BACKGROUND ART

Existing motored locking mechanisms involve the following shortcomings:

1. The existing electrical locks have a large volume. Normally, multiple motors are required to cooperate to complete the working process of electric locks.

2. The motor is rotated positively and negatively to achieve control of existing electrical locks. The control accuracy is low and lock reliability is inadequate.

3. The motor has a single output on one plane and the output on the plane is synchronized in real time, that is to say, output on two planes interfere with each other.

4. When the motor has output on a mechanism, the motor can be rotated under counter-reaction of the mechanism. The existing electrical locks are easy to be interfered by the external factors which is disadvantageous to the control stability of the lock.

The applicant has performed a new design of the existing locks and the present invention provides a new construction of the motored locking mechanism of the locks to meet new design requirements.

DISCLOSURE OF INVENTION

The object of the invention is to provide a motored locking mechanism, which has a small volume. Output from one motor to two transmission mechanisms is achieved and both transmission mechanisms do not interfere with each other. Therefore one side of the two sides of a mirror surface is driven while the other side is not.

The object is achieved by the following subject matter of the present invention:

A motored locking mechanism, comprising a motor, two groups of transmission mechanisms that are arranged mirror symmetrically and two output components that are arranged mirror symmetrically, wherein a driving gear is provided at an output end of the motor, wherein the driving gear is attached to an output shaft of the motor, wherein the two groups of transmission mechanisms further comprise each an input gear, wherein both input gears are designed as contrate gears, and wherein rotational shafts of both input gears are parallel to each other, wherein one driving gear is engaged with both input gears, wherein the two input gears are spaced 180 degrees from each other on the circumference of the driving gear.

Therefore, transmission mechanisms on two mirror sides are controlled by a common motor which takes up less space with a simpler structure.

Furthermore, the transmission mechanisms further comprise a middle gear and an output gear, wherein the input gear drives the middle gear to rotate and the middle gear is engaged with the output gear.

Therefore, the power transmitting process is more reliable with smaller error.

Furthermore, the middle gear comprises a first middle gear, a second middle gear and a third middle gear, wherein the input gear and the first middle gear are fixed coaxially, and wherein the first middle gear, the second middle gear, the third middle gear and the output gears engage with each other in sequence.

Change of speed can be achieved by setting the gear transmitting ratio.

Furthermore, a rotatable shaft is fixedly mounted on the first middle gear, wherein an overrunning clutch is fixedly attached to the rotatable shaft, wherein the first middle gear is attached to the overrunning clutch.

Therefore, a single-way output of the motor is achieved and the reverse movement of the output component will not be reversely transmitted to the motor. A free rotating of the electrical locking system due to vibrations by opening or closing the door is prevented. It is assumed that the normal rotating direction of the gear is front, external force forwards must be greater than the friction force to drive the motor and any other gears multiplied by the magnified sum of all gear ratios, while external force backwards must be greater than the maximum bearing force of the single-way gear to push the system.

Furthermore, the output component is designed as a motored jamming hook, wherein one end of the motored jamming hook is designed as a hook end and the other end is a pin shaft connecting end, wherein the motored jamming hook is provided with an oval through hole, wherein the motored jamming hook swings around the pin shaft connecting end, wherein the front end of the output gear is provided with an eccentric pillar, which passes through the oval through holes, wherein the eccentric pillar circulates around a central shaft of the output gear when the output gear rotates, wherein the eccentric pillar drives the motored jamming hook to swing.

Therefore, transmission errors are effectively reduced, the rotation is transferred to a periodical swing and a more precise and easy control is enabled. The two positions of the of the swing refers to two status as open and close. When the motor rotates positively, one of the transmission mechanisms is driven to have output on the motored jamming hook to swing and switch between open and close status, and the other transmission mechanism of the other mirror side does not have any output on the motored jamming hook. When the motor rotates negatively, the working status of the transmission mechanisms on the two mirror sides are exchanged. Thus, controlling of the open and close status on one mirror side through positive rotating of the motor is achieved, while negative rotating of the motor controls open and close status on the other mirror side.

The present invention has the following effects:

1. One motor, two ways to output.

2. One motor can rotate both positively and negatively and drive open and close status on two mirror sides separately. Open and close on the two mirror sides do not correlate with each other.

3. Only small volume is required. The adopted gear transmission mechanism is more reliable and stable.

4. A unidirectional rotation is transferred to a periodical swing. Errors are effectively reduced and accuracy of control is ensured.

5. Only unidirectional transmission is used. Counter-directional influences of the output end due to external factors are avoided, reliability of the motor output end is ensured and control is more reliable.

BEST MODE FOR CARRYING OUT THE INVENTION

In order that those skilled in the art can better understand the present invention, the subject matter of the present invention is further illustrated in conjunction with figures and embodiments.

First Embodiment

FIG. 1shows a motored locking mechanism, comprising a motor29, two groups of transmission mechanisms that are arranged mirror symmetrically and two output components that are arranged mirror symmetrically, wherein the two groups of transmission mechanisms are driven by a common motor29and the transmission mechanisms transfer the power of the motor29to the output components, wherein the motor29is provided at an output end with a driving gear28, wherein the driving gear28is attached to an output shaft of the motor29, wherein the two groups of transmission mechanisms further comprise each an input gear26, wherein both input gears26are designed as contrate gears, and wherein rotational shafts of both input gears26are parallel to each other, wherein one driving gear28is engaged with both input gears26, wherein the two input gears26are spaced 180 degrees from each other on the circumference of the driving gear28.

FIGS. 2 to 13show a lock that does not distinguish between public and private spaces, comprising two sub locking systems having the same structure, which are arranged mirror symmetrically, wherein each of the two sub locking systems comprises a cylinder mechanism B, a mechanical locking mechanism D and a motored locking system C, wherein two cylinder mechanisms drive together a same latchbolt mechanism E to move.

As shown inFIGS. 2 to 7, the cylinder mechanism B comprises a latchbolt control ring1, mechanical locking rings4,10, electrical locking rings2,9, control pillars8,11, an electrical unlocking cam6and an extension spring3. The latchbolt control ring1controls and matches the latchbolt mechanism E. The extension spring3and the control pillars8,11form a rotating torque and the extension spring strains the electrical locking rings2,9in a direction opposite to unlocking. Two cylinder mechanisms B share one latchbolt control ring1and the control pillars8,11are positioned on one same axis and are coaxially rotatable, as shown inFIG. 5.

As shown inFIG. 5, the two control pillars8,11have rectangular cross sections, and among the two control pillars8,11, one of the control pillars8is provided at its front surface with a rotatable rod81and the other control pillar11is provided at its front surface with a counterbore, wherein the rotatable rod81can rotate in the counterbore after the rotatable rod81is inserted into the counterbore. The rotatable rod81passes through the latchbolt control ring1movably, wherein the latchbolt control ring1can rotate around the rotatable rod81. As shown inFIG. 9, N1is a movement trajectory of an automatic unlocking ring21and N2is a movement trajectory of an automatic unlocking ring24. Z1represents an unlocking state, Z2represents a standby state and Z3represents a state of locking the latchbolt manually. InFIG. 9, the lever rotates clockwise to change the state from Z2to Z1, and then the lever rotates anticlockwise to change the state to Z3.

As shown inFIGS. 5, 10, 11, 12 and 13, each of the control pillars8,11is attached to control sleeves7. The control pillars8,11matches the control sleeves7through a spline, wherein each of the two control sleeves7is provided with a first control pin71and a second control pin72circulates around the rotatable rod81and the direction of the first control pin71that controls the latchbolt control ring1to unlock corresponding to the direction, in which the second control pin controls the latchbolt control ring to unlock.

As shown inFIGS. 5, 10, 11, 12 and 13, the control sleeves7pass in sequence through the electrical unlocking cam6and the mechanical locking ring4, wherein the control sleeves7each matches the electrical unlocking cam6and the mechanical locking ring4through the spline. The first control pin71passes in sequence through the electrical unlocking cam6, the mechanical locking ring4, the electrical locking ring2, the latchbolt control ring1and the electrical locking ring9, wherein the electrical locking ring2remains unrotated while the first control pin71rotates with the lever. The second control pin71passes in sequence through the electrical unlocking cam6, the mechanical locking ring10, the electrical locking ring9, the latchbolt control ring1and the electrical locking ring2, wherein the electrical locking ring9remains unrotated while the second control pin72rotates with the lever and when the latchbolt control ring1rotates, the electrical locking ring2rotates.

As shown inFIGS. 5, 10, 11, 12 and 13, the first control pin71and the second control pin71both have fan-shaped cross sections, and the arc size of the fan shape is in. The electrical locking ring2is provided with two arc-shaped through holes, the arc size of one arc-shaped through hole is 2 in and the arc size of the other arc-shaped through hole is 3 in, wherein the electrical locking ring9and the electrical locking ring2are mirror symmetrical. In case that the first control pin71matches the arc-shaped through hole of the electrical locking ring2that has an arc size of 3 in, the first control pin71may rotate at the same angle clockwise and anti-clockwise within the arc-shaped through hole of the electrical locking ring2. When the first control pin71in located in the middle of the arc-shaped through hole of the electrical locking ring2that has a3in arc size, the electrical locking ring2is in the standby state. In case that the first control pin71matches the arc-shaped through hole of the latchbolt control ring2that has an arc size of 2 in, when the first control ring71rotates in a direction of unlatching, the latchbolt control ring1rotates therewith and when the first control ring rotates with an arc size of in in an opposite direction of unlatching, the latchbolt control ring1does not rotate. In the case that the first control pin71matches the arc-shaped through hole of the electrical locking ring9that has an arc size of 2 in, when the electrical locking ring9is locked, the first control pin cannot rotate in a direction of unlatching, but rotates with an arc size of in in an opposite direction of unlatching. Since the second control pin72has a similar structure as the first control71, a repetition is waived here.

As shown inFIGS. 5, 10, 11, 12 and 13, a working process is described: when the electrical locking ring2is locked, the control pillar11cannot perform movements in the direction of unlatching and when the electrical locking ring9is locked, the control pillar8cannot perform movements in the direction of unlatching. The control pillars8,11control the latchbolt control ring1separately and do not interfere with each other. The mechanical locking ring4and the control pillar8rotate synchronously and the mechanical locking ring10and the control pillar11rotate synchronously.

As shown inFIGS. 14 and 15, the latchbolt mechanism E comprises a rotatable latchbolt16and a torsion spring17. The rotatable latchbolt16is provided with a rotatable pin rod, wherein the rotatable latchbolt16rotates around the rotatable pin rod. The torsion spring17controls the rotatable latchbolt16to stay in an extended state. The rotatable latchbolt16matches the latchbolt control ring1. The rotatable latchbolt16is a plate-shaped structure and has a semicircular form. The rotatable latchbolt16has a guiding groove161and the latchbolt control ring1is provided with a hook1a, which reaches inside the guiding groove161. Inside the guiding groove161, a jamming protuberance1611is provided, with which the hook1aengages, and during the rotation of the rotatable latchbolt16, while the hook1aand the jamming protuberance1611rotate relatively, they also slide relatively.

The non-joint surface of a jamming block162and the rotatable latchbolt16is an inclined plane or a curved surface and the joint surface is the front end.

In the case that the non joint plane of the jamming block162and the rotatable latchbolt16is an inclined plane, there are at least three of the inclined planes and two of them are mirror symmetrically formed, and the other inclined plane connects the two mirrored symmetrically formed inclined planes.

FIGS. 14 and 15show show a latchbolt receiving mechanism that matches the latchbolt mechanism E, comprising a receiving chamber b1and a cover plate b2, wherein the chamber opening of the receiving chamber b1is covered by the cover plate b2. The cover plate b2is provided with a first through hole b21and a second through hole b22. The jamming block162is rotatably inserted into the first through hole b21and the rotatable latchbolt is inserted rotatably into the second through hole b22. The first through hole b21has a rectangular opening and the second through hole b22has a rectangular opening, wherein the first through hole b21and the second through hole b22form an inverse convex shape.

Working process is described as follows: In a locked state, the jamming block162lies inside the receiving chamber b1. The torsion spring17exerts pressure on the rotatable latchbolt16in such a way that the rotatable latchbolt16tends to rotate clockwise. The end of the hook1areaches into the guiding groove161. When the hook1ainteracts with the jamming block162and rotates clockwise, the rotatable latchbolt16rotates anticlockwise. The jamming block162rotates out of the through hole b21and into the door panel and thus pushes the door panel to achieve the door-opening movement. The above working process described above also applies to a required door-closing movement.

Characteristics of the latchbolt mechanism E are: 1. Movements of opening and closing are realized by rotating and thus an unintentional incorrect operation in an unnatural circumstance is avoided. 2. Due to the arrangement of the jamming block, the rotatable latchbolt is jammed after it rotatably enters into the receiving chamber. An opening movement can only be performed by rotating in an opposite direction, so that a more reliable locking state is realized. 3. A rotatable latchbolt with a plate structure has a wide width, which means that more shear force can be absorbed in the event of a forced breakthrough. 4. It applies for sliding doors, folding doors and so on. It is realized that setting of the latchbolt direction is avoided when switching the opening direction of a door, in other words, the operation to switch the opening direction of a door is equal in each of the two directions.

FIGS. 2 to 9show a mechanical locking system D and an electrical locking system C. The mechanical locking system D matches the mechanical locking rings4,10, wherein the electrical locking system C matches the electrical locking rings2,9.

As shown inFIGS. 1 to 8, a mechanical locking position sensor A1is further included, which locates position of the mechanical locking system D. The mechanical locking rings4,10are provided with a detective striped plate5, which is provided with a striped hole51, through which a pin shaft passes and the detective striped plate5can rotate around the pin shaft. The mechanical locking sensor A1adopts a mechanically triggered sensor, which is triggered at different position during movements, so that positioning is realized.

As shown inFIGS. 2 to 9, an electrical locking position sensor A2is further included, which locates the state position of the electrical locking system C. The electrical locking position sensor A2may adopt a mechanically triggered sensor. The electrical locking position sensor A2locates the position of a motored jamming hook19.

The mechanical locking position sensor A1and the electrical locking position sensor A2form together a sensor system A.

As shown inFIGS. 2 to 9, 11, 12 and 13, the mechanical locking system D comprises mechanical locking cams12,13, a compressed spring15, a connecting sheet14and a mechanical locking housing30. The connecting sheet14is provided with a notch, in which the compressed spring15lies.

The compressed spring15lies inside the mechanical locking housing30and the connecting sheet14reaches partially movable into the mechanical locking housing30. One end of the connecting sheet contacts with the compressed spring15, and the other end connects with the mechanical locking cams12,13through the pin shaft. The mechanical locking cams12,13match the mechanical locking rings4,10and are provided with jamming protuberances121,131. The mechanical locking rings4,10are provided with hooks, which match the jamming protuberances121,131. The mechanical locking housing30is provided with two first jamming holes30aand the two connecting sheets14are provided correspondingly with second jamming holes14a.

A working progress is described as follows: when the mechanical locking ring4rotates with an arc size of in in an opposite direction of unlatching, the mechanical locking ring4presses against the mechanical locking cam12, which compresses the compressed spring15and the end of the mechanical cam12rotates to the rotating track of the rotatable latchbolt16, such that the rotatable latchbolt16is unable to unlatch through rotation. The mechanical locking ring10, the mechanical locking cam13, the compressed spring15and the rotatable latchbolt16are matched in a similar manner and thus a repetition is waived here.

The engagement between the jamming protuberances121,131and the hooks on the mechanical locking rings4,10has the following function: when the mechanical locking rings4,10rotate in the direction of opening, the hooks hook the jamming protuberances121,131, and thus the mechanical locking cams12,13are rotated to block the rotation track of the rotatable latchbolt16to avoid that the mechanical locking cams12,13may block the rotatable latchbolt16and affect the unlatching movement.

During mounting, when an inserting pin is inserted into the first jamming hole30aand the second jamming hole14a, one of the connecting sheets14is fixed, the connecting sheet14moves neither inwards nor outwards inside the mechanical locking housing30. Thus, one side of the locked connecting sheet cannot lock the latchbolt by rotating the lever in the opposite direction of unlatching. In an unmounted state, neither of the two connecting sheets is locked. In a specific mounting, depending on the logic of how the room door is planned, people can choose to lock one connecting sheet14, or to lock neither of the two connecting sheets or both two connecting sheets. A selection among a variety of logic combinations is thus achieved.

As shown inFIGS. 2 to 9, the motored locking system C comprises two sets of mirror symmetric transmitting mechanisms and two motored jamming hooks19that are mirror symmetrical, wherein both sets of the transmitting mechanisms are driven through a motor29.

The transmission mechanisms transmit the power of the motor29to the motored jamming hooks19. Between the two sets of transmission mechanisms, a plate18is provided in that the two sets of transmission mechanisms are mirror symmetric regarding the plate18.

The electrical locking cams2,9are provided with hook parts, which match the motored jamming hooks19. When the motored jamming hooks19hook the hook parts of the electrical locking cams2,9, the electrical locking cams2,9are locked.

The transmission mechanisms are gear-driven, wherein two sets of the transmission mechanisms are provided mirrored and symmetrical on both sides of plate18.

A transmission mechanism comprises an input gear26, a first middle gear27, a second middle gear25, a third middle gear23and an output gear20. The input gear26and the first middle gear27are arranged coaxially, and the first middle gear27, the second middle gear25, the third middle gear23and the output gear20are engaged in sequence.

The input gear26is a contrate gear and the first middle gear27and the third middle gear are unidirectional gears.

A unidirectional rotation of the first middle gear27is realized by fixing a rotatable shaft on the first middle gear27. An overrunning clutch22is fixedly mounted on the rotatable shaft, wherein the first middle gear27is attached to the overrunning clutch22. The function of the overrunning clutch22lies in that the transmission mechanism on one mirrorside outputs when the motor rotates positively, and the transmission mechanism on the other mirrorside outputs when the motor rotates reversely, that is to say, on both mirrorsides, the first middle gear27on one mirrorside is driven by rotating the motor positively, while the overrunning clutch22that is attached to the first middle gear27on the other mirrorside idles. Similarly, when the motor rotates reversely, only one transmission mechanism is driven to output by rotating the motor in one direction.

A unidirectional rotation of the third middle gear23is realized by providing a rotatable shaft on the locking housing. An overrunning clutch22is attached to the rotatable shaft, wherein the third middle gear23is attached to the overrunning clutch22. The middle gear23engages then with the output gear20. The transmitting process is that the third middle gear23rotates and drives the output gear20, the output gear20, however, cannot drive the third middle gear23backwards, which successfully prevents the gears of the electrical locking system from rotating freely, which may be caused by swings of opening or closing the door.

An overrunning clutch is a basic part which appears along with the development of the mechatronic integrated products. It is an important part for transmitting and separating function between a prime mover and a working machine or between a driving shaft and a driven shaft inside a machine. It is a device having the self-clutch function by making use of velocity change of the driving part and the driven part as well as the switch of the rotation direction. An overrunning clutch may be a wedge-typed overrunning clutch, a roller-typed overrunning clutch or a ratchet-typed overrunning clutch. The overrunning clutch belongs to prior art and thus a repetition is waived here.

At last, the output gear20drives the motored jamming hook19to swing periodically.

As shown inFIG. 5, two transmission mechanisms share a common motor29, which is provided at its output end with a driving gear28, which is attached to an output shaft of the motor29. The driving gear28engages with both input gears26. The working state on both sides of two motored jamming hooks19is described as follows: the motored jamming hook19on one of the mirrorsides works, while the motored jamming hook19on the other mirrorside does not work. When the motor rotates positively and reversely, the motored jamming hooks19on both mirrorsides repeat controlling the state of the switch on the corresponding side alternatively.

As shown inFIG. 5, one end of the motored jamming hook19is an end of the hook part and the other end of the motored jamming hook19is a connecting end of the pin shaft. The motored jamming hook19is provided with oval through holes, which are located between the end of the hook part and the connecting end of the pin shaft. The motored jamming hook19swings around the pin shaft.

The front end of the output gear20is provided with an eccentric pillar201, which passes through the oval through holes. When the output gear20rotates, the eccentric pillar201rotates around the fixed shaft of the output gear20and the eccentric pillar201drives the motored jamming hook19to swing.

The connecting end of the pin shaft of the motored jamming hook19triggers the motored locking position sensors A2at different positions, so that a positioning is realized.

As shown inFIGS. 4, 5 and 7, the cylinder mechanism B is provided with an electrical unlocking cam6, which rotates synchronously with the control pillars10,11. The motored locking system C further comprises automatic unlocking rings21,24. The output gear20and the output gear20rotate coaxially and synchronously. Two electrical unlocking cams6match the automatic unlocking rings21,24.

The eccentric pillar201is fixed on the front end of the automatic unlocking rings21,24and passes through the output gear20.

When the control pillars8,11rotate in the opposite direction of unlatching, the mechanical locking rings4,10moves the ends of the mechanical locking cams12,14to rotate redirected to the unlatching rotation track of the rotatable latchbolt16, so that locking of the rotatable latchbolt16is realized. When the motor29drives the motored jamming hook19to rotate, the automatic unlocking rings21,24rotate synchronously. Two electrical unlocking cams6are moved separately to rotate when the automatic unlocking rings21,24rotate. Two electrical unlocking cams6move the control pillars8,11with them to turn back to the standby state, that is to say, the lever is turned back to the standby state. After the motor29rotates in one period, the eccentric pillar201moves from one end of the short shaft of the oval through holes to the other end and an one-way swing is accomplished. When the motor29and the automatic unlocking rings21,24rotate, the electrical unlocking cams6are necessarily moved back to the original position, and thus an unlocking of the rotatable latchbolts21,24by the mechanical locking cams12,13are achieved.

As shown inFIG. 3, the lock according to the present invention is further provided with a jamming protrusion. A jamming protrusion is provided at the rotatable latchbolt16to avoid an excessive rotation angle of the latchbolt during unlatching, while a jamming protrusion is provided in the opposite direction of unlatching rotating direction at the latchbolt control ring1, a jamming protrusion is provided at the motored locking rings2,9. The rotating distance of a jamming hooked structure of the latchbolt control ring1is jammed under tension of the extension spring3, however, the rotating distance in the unlatching direction is not limited by the protrusion.

Second Embodiment

In a further embodiment on the basis of the aforementioned embodiment, a first latchbolt synchronizer163and a second latchbolt synchronizer164are provided on one side of the latchbolt16and are coaxial with a latchbolt rotating shaft to prevent the electrical locking system from being bypassed by an object such as a plastic card and to prevent the door from being forcibly opened, as shown inFIGS. 16 to 25. The second latchbolt synchronizer164is provided between the latchbolt16and the first latchbolt synchronizer163. When the latchbolt16rotates along Z3to lock the door, the second latchbolt synchronizer164synchronizes with the latchbolt16, however extends outwards with a linear movement. In the present embodiment, the jamming protuberance1611on the latchbolt16may be concave shaped compared to that in the first embodiment and has the same function as in the first embodiment. Thus, a repetition is waived here. By adding the first latchbolt synchronizer163and the second latchbolt synchronizer, a telescopic member31, a double-ended tension spring32and a jamming hook33. The jamming hook33contacts the latchbolt16when the latchbolt is in an unlatched state, as shown inFIG. 16. The double-ended tension spring32is provided inside the jamming hook33with one end pressing against the jamming hook33and the other hand contacting the mechanical locking housing30, such that the jamming hook33can move when latchbolt16rotates. When the jamming protuberance1611of the latchbolt16is passed, the jamming hook33jams the latchbolt16such that the latchbolt16cannot rotate outwards. The telescopic member31can bear force and move inwards to inside the lock when closing the door. Further, the jamming hook33is rotated clockwise such that the jamming hook33leaves the area that jams the jamming protuberance to release latchbolt16. As shown inFIGS. 15 and 16. Meanwhile, it is worth to mention that the side of the telescopic member31, which is away from the inside of the lock, is arc-shaped, which applies for all kinds of doors. Through the arrangement of the telescopic member31, the double-ended tension spring32and the jamming hook33, the latchbolt cannot rotate outwards when the door leaves the door frame, which thus enhances the overall harmonious impression. A latchbolt is provided to avoid jamming of rope-shape objects such as strings, belts and others due to unnecessary extending out. Meanwhile, since it is not required to resist the spring force of the latchbolt when closing the door, the door closing movement is smoother. In further technical effects, such design prevents the user from accidentally locking the latchbolt when the door is opened. If the latchbolt keeps extending out when the door is opened, certain noises appear when closing a sliding door and in case a bump into the door frame is unavoidable, which itself is a damage on the door frame. This design can partially avoid the bump from the latchbolt to the door frame. Meanwhile, the bump is concentrated on telescopic member31. The telescopic member31ejects automatically after bumping into a latchbolt16, which will not affect the resilience function of the sliding door.

A lock that does not distinguish between public and private spaces according to the present invention is explained in detail above. The description of specific embodiments is only intended to help in understanding the method and core idea of the present invention. It should be noted that the skilled person in the art can make improvements and modifications without departing from the technical principles of the present invention. These improvements and modifications should also be considered as the scope of protection of the present invention.