CN108240143B

CN108240143B - Lockset and shielding door

Info

Publication number: CN108240143B
Application number: CN201611208952.8A
Authority: CN
Inventors: 刘修武; 李跃; 宋会志
Original assignee: Panasonic Manufacturing Beijing Co Ltd
Current assignee: Panasonic Manufacturing Beijing Co Ltd
Priority date: 2016-12-23
Filing date: 2016-12-23
Publication date: 2023-06-20
Anticipated expiration: 2036-12-23
Also published as: CA3032700A1; WO2018113465A1; CN108240143A; CA3032700C

Abstract

The invention relates to a lockset and a shielding door. The lockset comprises: a cam rotatable at least between a first position and a second position, the cam having an engagement portion for engagement with a locked member; a locking assembly capable of locking the cam such that the cam cannot rotate; and a trigger assembly. The trigger assembly is triggered to lock the locking assembly when the cam rotates to the second position, and stops being triggered to unlock the locking assembly when the cam rotates to a position other than the second position. The locked member is capable of disengaging from and engaging with the engagement portion when the cam is in the first position, and is incapable of disengaging from the engagement portion when the locked member engages with the engagement portion and the cam is rotated to the second position. The invention also provides a shielding door adopting the lockset. Therefore, the lock disclosed by the invention is simple in structure and low in possibility of faults and misoperation, so that the shielding door can run more smoothly.

Description

Lockset and shielding door

Technical Field

The invention relates to a lock and a shielding door adopting the lock.

Background

The existing shielding doors in subway stations generally use electromagnetic locks that lock and unlock the door body by inserting and extracting locking pins. Although such an electromagnetic lock can hold the shielding door in the closed position when needed, the electromagnetic lock of the related art has the following drawbacks:

1. the electromagnetic lock in the prior art has a complex structure and an asymmetric structure, so that the difficulties of processing, assembling and construction are high, and the replacement and maintenance are difficult;

2. the working accuracy of the electromagnetic lock in the prior art is low, and misoperation is easy to cause; and

3. the electromagnetic lock in the prior art can generate more metal scraps which are difficult to clear in the working process, and the electromagnetic lock is easy to break down.

Disclosure of Invention

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a lock and a shielding door using the lock, which can at least alleviate one of the above-mentioned technical problems.

In order to achieve the above object, the present invention adopts the following technical scheme.

The invention provides a lock, comprising: a cam rotatable at least between a first position and a second position, the cam having an engagement portion for engagement with a locked member; a locking assembly capable of locking the cam such that the cam cannot rotate; and a trigger assembly that is triggered to cause the locking assembly to perform the locking when the cam is rotated to the second position, and stops being triggered to cause the locking assembly to release the locking when the cam is rotated to a position other than the second position, wherein the locked member is able to be disengaged from and engaged with the engagement portion when the cam is in the first position, and is unable to be disengaged from the engagement portion when the locked member is engaged with the engagement portion and the cam is rotated to the second position.

Preferably, the engagement portion is a click portion including a notch provided at a peripheral edge of the cam and a recess recessed radially inward of the cam with respect to the notch and toward an upstream side in a direction in which the cam rotates from the first position to the second position.

Preferably, the trigger assembly includes a mechanical switch, and a trigger portion is formed at an outer periphery of the cam, and presses the mechanical switch to trigger the trigger assembly when the cam rotates to the second position.

More preferably, the mechanical switch is a micro switch.

More preferably, the trigger portion includes a small diameter portion, a large diameter portion, and a connection portion connecting the small diameter portion and the large diameter portion, a maximum distance from an outer peripheral surface of the small diameter portion to a rotation center of the cam is smaller than a minimum distance from the outer peripheral surface of the mechanical switch to the rotation center of the cam, and a maximum distance from the outer peripheral surface of the large diameter portion to the rotation center of the cam is larger than a minimum distance from the outer peripheral surface of the mechanical switch to the rotation center of the cam.

Preferably, the locking assembly comprises an armature and a solenoid, the armature is capable of telescoping under the action of the solenoid, the solenoid is powered off when the trigger assembly is triggered and is powered on when the trigger assembly stops being triggered and when the lock is to be unlocked, the armature falls down and locks the cam when the solenoid is powered off, and the armature is attracted and unlocks the cam when the solenoid is powered on.

More preferably, the cam further includes a first stepped portion formed by forming a stepped structure at a peripheral edge of the cam, and when the electromagnetic coil is de-energized, the armature falls down and abuts the first stepped portion to lock the cam.

More preferably, the first step portion includes a first face parallel to a central axis of the armature when the cam is in the second position, and a second face perpendicular to the first face and parallel to an end face of the armature, and the armature falls to a position abutting the first face and the second face when the electromagnetic coil is deenergized.

More preferably, the cam further includes a second stepped portion formed by forming a stepped structure on a peripheral edge of the cam, the second stepped portion being formed on an upstream side of the first stepped portion in a direction in which the cam rotates from the second position to the first position, the second stepped portion abutting the armature when the cam rotates to the first position.

Preferably, the cam comprises a first cam and a second cam, and the trigger assembly comprises a first trigger assembly arranged for the first cam and a second trigger assembly arranged for the second cam.

More preferably, the first and second cams are structured to be line-symmetrical with respect to a central axis of the armature, and when the electromagnetic coil is de-energized, the armature falls down to a space formed by the first and second faces of the first cam and the first and second faces of the second cam to lock the first and second cams at the same time.

The invention also provides a shielding door comprising the lock according to any one of the above claims and a door body slidable between an open position and a closed position, the locked member being fixed to the door body, the cam being in the first position when the door body is in the open position, the cam being in the second position when the door body is in the closed position, the locked member first engaging the engagement portion of the cam during sliding of the door body from the open position to the closed position, then the locked member causing the cam to rotate from the first position to the second position, and the locking assembly first unlocking the cam during sliding of the door body from the closed position to the open position, then the locked member causing the cam to rotate from the second position to the first position and thereafter disengaging the cam.

Instead of a lock pin, the lock of the present invention includes a cam, a trigger assembly and a locking assembly, is simpler in construction, and has a reduced likelihood of malfunction and malfunction.

Drawings

FIG. 1a is a schematic perspective view showing the structure of a lock according to an embodiment of the present invention; FIG. 1b is a schematic plan view showing the structure of the lock of FIG. 1 a; fig. 1c is another schematic plan view showing the structure of the lock of fig. 1 a.

Fig. 2 is an enlarged schematic view showing the left cam of the lock of fig. 1 b.

Fig. 3a and 3b are schematic explanatory views for explaining an operating state of the lock in fig. 1a, in which a part of the structure of the lock is omitted.

Detailed Description

The following description of the embodiments of the present invention refers to the accompanying drawings. The reference "L" in the figure indicates the longitudinal direction of the door body; the "H" symbol indicates the height direction of the door body. In the following description, the present invention will be described with reference to the application of the lock of the present invention to a side-by-side door.

In the present invention, the "open position" and the "closed position" of a pair of door bodies of a side-by-side door refer to a position when the pair of door bodies are in a state of being farthest from each other and a position when the pair of door bodies are in a state of being in contact with each other, respectively; when a pair of door bodies slides between an "open position" and a "closed position," the pair of door bodies may be referred to as being in an "intermediate position.

In the present invention, the "unlock position" and "lock position" of the cam refer to the position where the cam is located when the whole lock is locked to the door body (i.e., the lock is in the locked state) and the position where the cam is located when the whole lock is unlocked from the door body (i.e., the lock is in the unlocked state), respectively.

In the present invention, with respect to the left cam, "clockwise" means a direction in which the left cam rotates from the locked position to the unlocked position in fig. 1b, 1c, 3a and 3 b; the "counterclockwise direction" is the direction opposite to the "clockwise direction".

In the present invention, unless otherwise specified, "left", "right", "upper" and "lower" indicating orientations refer to the left side, right side, upper side and lower side in fig. 1b, 1c, 3a and 3 b.

(Structure of lockset)

As shown in fig. 1a to 1c, the lock according to an embodiment of the present invention includes a lock bracket 1, left and

right cams

21 and 22, a trigger assembly (left and right micro switches 31 and 32), a locking assembly (armature 41 and solenoid 42), a manual unlocking lever 5, and a limit buffer 6. In the present embodiment, the lock bracket 1 is used to support other parts of the lock and may be fixed to the door frame by screwing or the like. In the side-by-side door, the door frame is used to mount and house a pair of door bodies (not shown) of the side-by-side door, which are capable of sliding freely between an open position and a closed position. The shape, material, manner of fixing to the door frame, and the like of the lock bracket 1 are not limited in the present invention.

In the present embodiment, the left cam 21 and the right cam 22 are rotatably provided to the lock bracket 1 by bolts. Gaskets are provided between the heads of the bolts and the left and

right cams

21 and 22. The bolts are only examples, and the present invention is not limited to the manner in which the left cam 21 and the right cam 22 are provided to the lock bracket 1. The left cam 21 and the right cam 22 are located at the center position in the longitudinal direction L of the entire side-by-side door and are provided above the pair of door bodies of the side-by-side door in the height direction H.

The left cam 21 and the right cam 22 are symmetrical with respect to a center line of the side-by-side door in the longitudinal direction L, and are disposed apart from each other in the longitudinal direction L. The left cam 21 is engaged with and disengaged from a left door hook 71 of a left door body of a pair of door bodies fixed to the side by side door, and the right cam 22 is engaged with and disengaged from a right door hook 72 of a right door body of a pair of door bodies fixed to the side by side door. When engaged with the corresponding door hook, the left and

right cams

21 and 22 are each rotatable as the pair of door bodies slide between the open and closed positions, and the left and

right cams

21 and 22 are rotated in opposite directions during rotation as the left and right door bodies slide, respectively. The left and

right door hooks

71 and 72 have the same structure, and as shown in fig. 1a, the left and

right door hooks

71 and 72 have an L shape, a longer arm of which is fixed to the door body, and a shorter arm of which is engaged with the cam. As an example, a hole is formed at an end of the longer arm, and a bolt is inserted into the hole to construct the shorter arm. However, the present invention is not limited to the door hook, and the door hook may take any suitable shape, structure, or the like.

The left and

right cams

21, 22 have a generally circular basic shape, and the left and

right cams

21, 22 also have structures for cooperating with the trigger assembly, the locking assembly and the door hook.

As shown in fig. 2, the left cam 21 is provided with an engagement portion 211 for engaging with the left door hook 71. The engagement portion 211 includes a notch provided at the peripheral edge of the left cam 21, and a recess communicating with the notch, the recess being recessed from the notch toward the radial inner side of the left cam 21 and toward the upstream side in the counterclockwise direction.

When the left cam 21 is in the unlocking position (first position, see fig. 3 b), the notch of the catch 211 faces the left door hook 71 and is flush with the left door hook 71 in the height direction H. When the left door body slides from the open position to the closed position to drive the left door hook 71 to move to a predetermined intermediate position, the left door hook 71 enters the notch of the engaging portion 211. With further sliding of the left door body, the left door hook 71 abuts against the left cam 21, pushing the left cam 21 to rotate counterclockwise, and then the left door hook 71 enters the recess of the engagement portion 211, so that the left cam 21 is in the lock position (second position, see fig. 3 a). In contrast, when the left door body slides from the closed position to the open position, the left door hook 71 drives the left cam 21 to rotate clockwise, and is disengaged from the engagement portion 211 when the left cam 21 rotates to the prescribed position.

In order to enable the left door hook 71 to easily pass through the notch, the width of the notch in the height direction H is larger than the width of the shorter arm of the left door hook 71 in the height direction H. In order to reliably hold the left door hook 71 in the recess of the engagement portion 211, the depth D of the side surface of the recess on the downstream side in the clockwise direction with respect to the notch is larger than the radius of the shorter arm of the left door hook 71. Preferably, a side surface of the notch on the downstream side in the clockwise direction is provided as a flat surface that is parallel to a plane on which the movement locus of the left door hook 71 is located when the left cam 21 is in the unlock position and that contacts the left door hook 71 at an early stage when the left door hook 71 enters the engagement portion 211, so that the movement of the left door hook 71 can be guided. Further, the size of the engagement portion 211 should not be excessively large, otherwise the overall rigidity of the left cam 21 is affected. However, the present invention is not limited to the shape of the engaging portion 211, and the engagement between the cam and the door hook is not limited to the engagement, as long as the engagement between the engaging portion 211 and the left door hook 71 can be ensured.

As shown in fig. 2, the left cam 21 is further provided with a first step 212, and the first step 212 is formed by forming a step structure on the peripheral edge of the left cam 21. When the left cam 21 is rotated to the locking position shown in fig. 3a, the first face 2121 of the first step 212 is parallel to the central axis of the armature 41 of the locking assembly, and the second face 2122 of the first step 212 is perpendicular to the first face 2121 and parallel to the lower end face of the armature 41. Similarly, the right cam 22 has a first step 222. The distance in the longitudinal direction L between the first surface 2121 of the first stepped portion 212 of the left cam 21 and the first surface 2221 of the first stepped portion 222 of the right cam 22 is substantially equal to the width of the armature 41 in the longitudinal direction L, and the distance in the longitudinal direction L between the right end portion of the second surface 2122 of the first stepped portion 212 and the left end portion of the second surface 2222 of the first stepped portion 222 is smaller than the width of the armature 41 in the longitudinal direction L. As shown in fig. 3a, when the latch is required to be locked, the armature 41 of the locking assembly descends and closely abuts the first and second faces of the first and second stepped

portions

212 and 222, thereby locking the cam against rotation and effecting the function of holding the pair of door bodies in the closed position, i.e., locking the door bodies.

The shape of the

first step portions

212, 222 is not limited in the present invention, as long as they cooperate with the armature 41 to lock the cam against rotation.

Further, as shown in fig. 2, the left cam 21 is also provided with a trigger portion 213. The trigger portion 213 includes a small diameter portion 2131, a large diameter portion 2132, and a smooth inclined surface 2133 connecting the small diameter portion 2131 and the large diameter portion 2132. Wherein the maximum distance from the outer peripheral surface of the small diameter portion 2131 to the rotation center of the left cam 21 is smaller than the minimum distance from the outer peripheral surface of the left microswitch 31 to the rotation center of the left cam 21. That is, the small diameter portion 2131 does not come into contact with the left micro switch 31 during rotation of the cam. The maximum distance from the outer peripheral surface of the large diameter portion 2132 to the rotation center of the left cam 21 is larger than the minimum distance from the outer peripheral surface of the left microswitch 31 to the rotation center of the left cam 21. That is, when the left micro switch 31 and the large diameter portion 2132 face each other in the radial direction of the left cam 21, the large diameter portion 2132 biases the left micro switch 31 to turn on the movable contact and the fixed contact of the left micro switch 31, thereby bringing the left micro switch into a closed state. In order not to interfere with the rotation of the cam, the inclined surface 2133 is preferably formed at an angle smaller than 45 degrees with respect to the tangential direction at the connection point of the inclined surface 2133 and the small diameter portion 2131. On the other hand, in view of the size of the cam and shortening the operation time for closing the left micro switch, the angle of the inclined surface 2133 with respect to the tangential direction of the small diameter portion 2131 should not be too small.

In the present embodiment, when the left cam 21 rotates to the lock position with the sliding of the left door body, the large diameter portion 2132 contacts the left micro switch 31 to close the left micro switch 31, and when the left cam 21 moves away from the lock position with the sliding of the left door body, the large diameter portion 2132 rotates away from the left micro switch 31, and the left micro switch 31 is switched from the closed state to the open state.

The left cam 21 further includes a second step portion 214, and the second step portion 214 is also formed by forming a step structure on the peripheral edge of the left cam 21. The second step 214 is formed on the upstream side of the first step 212 in the clockwise direction. Similarly, the right cam 22 has a second step 224. When the left cam 21 is in the unlock position, a part of the armature 41 in the lifted state is located between the second stepped portion 214 of the left cam 21 and the second stepped portion 224 of the right cam 22, and a part of the second stepped portion 214 of the left cam 21 and a part of the second stepped portion 224 of the right cam 22 abut against the armature 41, thereby preventing the left cam 21 and the right cam 22 from continuing to rotate.

The left cam 21 also includes a stop 215. The stopper 215 is formed on the upstream side of the trigger 213 in the clockwise direction. Similar to the trigger portion 213, the stopper portion 215 includes a small diameter portion 2151, a large diameter portion 2152, and an inclined surface 2153 connecting the small diameter portion 2151 and the large diameter portion 2152. The distance of the outer peripheral surfaces of the small diameter portion 2151 and the large diameter portion 2152 with respect to the rotation center of the left cam 21 is set similarly to the small diameter portion 2131 and the large diameter portion 2132. Further, the inclined surface 2153 makes an angle of more than 45 degrees with respect to the tangential direction at the connection point of the inclined surface 2153 and the small diameter portion 2151. When the left cam 21 is in the unlock position, the inclined surface 2153 abuts the left microswitch 31, thereby preventing the left cam 21 from continuing to rotate in the clockwise direction.

Further, although not shown, the left cam 21 further includes a force application member to which a force to rotate it in the clockwise direction is applied. The urging member is, for example, a spring provided on the rotation shaft of the left cam 21. By cooperation of the biasing member, the second step 214, the stopper 215 and the armature 41, the left cam is positioned at the unlock position of fig. 3b, and no further rotation is performed.

The right cam 22 has a structure that is line-symmetrical to the center line of the left cam 21 in the longitudinal direction L with respect to the armature 41, and therefore the structure of the right cam 22 is not described in detail in the above description.

In the present embodiment, the trigger assembly includes a left micro switch 31 and a right micro switch 32, the left micro switch 31 corresponds to the left cam 21, and the right micro switch 32 corresponds to the right cam 22. As shown in fig. 1b and 1c, the movable contact of the left microswitch 31 is located at the upper left of the left cam 21, and the movable contact of the right microswitch 32 is located at the upper right of the right cam 22. In this way, the triggering portions of the left cam 21 and the right cam 22 respectively press the movable contacts of the left micro switch 31 and the right micro switch 32 to trigger the two micro switches when the pair of door bodies slide from the open position to the closed position, thereby controlling the locking assembly to lock the left cam 21 and the right cam 22.

It should be noted that the above-mentioned micro switch is only a preferred embodiment, and the trigger assembly is not limited to the micro switch, as long as the cam can be detected to rotate to the locking position and the locking assembly can be locked. For example, the trigger assembly may employ other mechanical switches, and may also be a light emitting portion and a light receiving portion, wherein the cam blocks light emitted from the light emitting portion when the cam is in the locked position, and does not block light emitted from the light emitting portion when the cam is in a position other than the locked position. Therefore, whether the cam is in the lock position can be determined based on whether the light receiving portion can receive the light emitted from the light emitting portion.

In this embodiment, the locking assembly includes an armature 41 and a solenoid coil 42. The armature 41 has an elongated rod-like structure. An end portion (upper end portion in fig. 1b and 1 c) of the armature 41 protrudes into the electromagnetic coil 42 so that the armature 41 can be expanded and contracted by the electromagnetic action of the electromagnetic coil 42 and the gravity of the armature 42 itself. The other end portion (lower end portion in fig. 1b and 1 c) of the armature 41 is disposed so as to be able to extend between the left cam 21 and the right cam 22.

When the solenoid 42 is energized, the armature 41 is attracted to the height shown in fig. 3 b. When the electromagnetic coil 42 is deenergized, the armature 41 falls. The energization and de-energization of the electromagnetic coil 42 is controlled by a control device not shown. The control device is connected with the trigger component. When the trigger assembly detects that the cam is in the locked position (i.e., when the

micro-switches

31, 32 are in the closed state), a notification is sent to the control device to cause the control device to de-energize the solenoid 42. When the trigger assembly detects that the cam is in a position other than the locked position (i.e., when the

micro-switches

31, 32 are in the off state), a notification is sent to the control device to cause the control device to energize the solenoid 42. Further, the control device energizes the electromagnetic coil 42 when receiving an instruction to unlock the lock from the outside even when the trigger assembly detects that the cam is in the locked position.

In this way, when the

cams

21 and 22 are rotated to the locking positions, the solenoid 42 is de-energized, and the armature 41 falls down to the space formed by the first stepped portions of the left and

right cams

21 and 22 by the own weight, thereby simultaneously locking the left and

right cams

21 and 22. When the lock is unlocked, the electromagnetic coil 42 is energized, the armature 41 is attracted by the electromagnetic action of the electromagnetic coil 42, the other end portion of the armature 41 is separated from the space formed by the first stepped portion to thereby realize unlocking, and then the armature 41 abuts against the second stepped portions of the left cam 21 and the right cam 22 to thereby realize stopping of the left cam 21 and the right cam 22.

It should be noted that the locking assembly of the present invention is not limited to the armature and the solenoid, and any locking structure known in the art may be used as long as the function of locking the cam when the cam is rotated to the locking position and unlocking when the cam is to be unlocked can be achieved. For example, one locking assembly may be provided for each of the left and right cams. In addition, holes may be provided in the left and right cams, respectively, and the locking assembly includes a locking lever and an actuating mechanism that urges the locking lever into the hole in the cam to lock when the cam is rotated to the locked position, and withdraws the locking lever from the hole to unlock the lock.

In the present embodiment, the manual unlocking lever 5 is rotatably provided to the lock bracket 1. In the case where a pair of door bodies of a side-by-side door (shield door) is in the closed position, the manual unlocking lever 5 may be manually operated to rotate to a predetermined position, if necessary, so that the armature 41 of the locking assembly is disengaged from the stepped portions 212 of the left and

right cams

21 and 22 to manually unlock the left and

right cams

21 and 22 and open the pair of door bodies of the side-by-side door.

In the present embodiment, the limit buffer 6 is fixed to the lock bracket 1 and is located at a position intermediate the left cam 21 and the right cam 22. The limit buffer portion 6 includes limit buffer structures which respectively correspond to the left door body and the right door body and are formed into a whole, so that the left door body and the right door body play a role in buffering and limiting the left door body and the right door body when sliding to the closed position. In the present embodiment, the stopper buffer portion 6 acts on the tip end portions in the longitudinal direction L of the door hooks (the left door hook 71 and the right door hook 72) attached to the left door body and the right door body to achieve the above-described effect, and a cushion pad made of an elastic material such as rubber is provided at a portion where the stopper buffer portion 6 contacts the door hooks.

The specific structure of the lock is described above, and the working state and working process of the lock will be described below in conjunction with the specific structure of the lock.

(lockset) operating state and the working process

As shown in fig. 3a, the lock is in a locked state in which the lock holds a pair of door bodies of the side-by-side combination door in a closed position. In this locked state, the engaging portions of the left cam 21 and the right cam 22 are engaged with the door hooks fixed to the left door body and the right door body, respectively, and the other end portion of the armature 41 of the locking assembly extends between the left cam 21 and the right cam 22 and is engaged with the first stepped portions of the left cam 21 and the right cam 22. Meanwhile, the triggering portions of the left cam 21 and the right cam 22 respectively press the left micro switch 31 and the right micro switch 32, thereby maintaining the solenoid 42 in the power-off state. In this way, the left and

right cams

21 and 22 cannot rotate due to the locking of the locking assembly, thereby reliably positioning the left and right door bodies in the closed position.

As shown in fig. 3b, the lock is in an unlocked state. In this unlocked state, the engaging portions of the left cam 21 and the right cam 22 are disengaged from the door hooks fixed to the left door body and the right door body, respectively, and stopped at positions substantially flush with the door hooks in the height direction H. The trigger portions of the left cam 21 and the right cam 22 are separated from the left micro switch 31 and the right micro switch 32, and the left micro switch 31 and the right micro switch 32 are in an off state with respect to the small diameter portions of the stopper portions of the left cam 21 and the right cam 22, so that the control device energizes the electromagnetic coil 42 to suck the armature 41 so that the other end portions thereof are separated from the space between the first stepped portions of the left cam 21 and the right cam 22 and are brought into contact with the second stepped portions of the left cam 21 and the right cam 22.

When the state is changed from the locked state shown in fig. 3a to the unlocked state shown in fig. 3b, that is, when the pair of door bodies of the side-by-side doors slide from the closed position to the open position, first, a command to unlock the lock is issued to the control device, the control device energizes the electromagnetic coil 42, the armature 41 is attracted, and the locks of the left cam 21 and the right cam 22 are released. Subsequently, the control device controls the pair of door bodies to slide from the closed position to the open position, and the pair of door bodies starts to rotate by driving the left cam 21 and the right cam 22 via the door hooks. First, the large diameter portions of the trigger portions of the left and

right cams

21 and 22 are out of contact with the left and right

micro switches

31 and 32, and the left and right

micro switches

31 and 32 are switched from the closed state to the open state. Subsequently, the hooks of the pair of door bodies are out of contact with the left and

right cams

21 and 22, and the second stepped portions of the left and

right cams

21 and 22 come into abutment with the attracted armatures 41, and the left and

right cams

21 and 22 stop rotating.

When the door is shifted from the unlock state shown in fig. 3b to the lock state shown in fig. 3a, that is, when the pair of door bodies of the side-by-side door slide from the open position to the closed position, the control device first controls the pair of door bodies to slide to the closed position. Then, when the pair of door bodies is slid to a predetermined position close to the closed position, the door hooks fixed to the pair of door bodies are engaged with the engaging portions of the left cam 21 and the right cam 22, and drive the left cam 21 and the right cam 22 to start rotating. First, the second stepped portions of the left and

right cams

21 and 22 are out of contact with the armature 41, and during rotation of the left and

right cams

21 and 22, the armature 41 is in sliding contact with the outer peripheral surfaces of the left and

right cams

21 and 22 between the first and second stepped portions. When the left cam 21 and the right cam 22 are rotated to the positions where the large diameter of the triggering portion triggers the left micro switch 31 and the right micro switch 32, respectively, the left micro switch 31 and the right micro switch 32 are switched from the open state to the closed state, and a signal is transmitted to the control device to power off the electromagnetic coil 42, so that the armature 41 falls down to the space between the first stepped portions of the left cam 21 and the right cam 22 under the action of the own gravity to lock the left cam 21 and the right cam 22.

The present invention also provides a shield door, such as a subway shield door, including a latch having the above specific structure and operation, mounted to a door frame of the shield door and for holding a pair of shield door bodies of the shield door in a closed position.

By adopting the technical scheme, the invention provides the lock with relatively simple structure and low possibility of faults and misoperation and the shielding door adopting the lock.

In addition, it should be noted that the lock according to the present invention can be used not only for a shield door, but also for other doors having a sliding door body. Also, the application of the lock of the present invention to the side-by-side doors is described in the above embodiments, but the present invention is not limited thereto. The invention can also be applied to single door opening. In this case, only one of the left-side structure and the right-side structure, which are line-symmetrical with respect to the center in the length direction L, of the lock described in the above embodiment need be provided.

The scope of the present invention is not limited to the specific examples in the above-described specific embodiments, but falls within the scope of the present invention as long as the combination of technical features of the claims of the present invention is satisfied.

Claims

1. A lock, the lock comprising:

a cam rotatable at least between a first position and a second position, the cam having an engagement portion for engagement with a locked member;

a locking assembly capable of locking the cam such that the cam cannot rotate; and

a trigger assembly which is triggered to cause the locking assembly to perform the locking when the cam is rotated to the second position, and stops being triggered to cause the locking assembly to release the locking when the cam is rotated to a position other than the second position, the trigger assembly including a mechanical switch, an outer periphery of the cam being formed with a trigger portion which presses the mechanical switch to trigger the trigger assembly when the cam is rotated to the second position,

wherein the locked member is disengageable from and engageable with the engagement portion when the cam is in the first position, and is disengageable from the engagement portion when the locked member is engaged with the engagement portion and the cam is rotated to the second position.

2. The lock according to claim 1, wherein the engagement portion is a click portion including a notch provided at a peripheral edge of the cam and a recess recessed from the notch toward a radially inner side of the cam and toward an upstream side in a direction in which the cam rotates from the first position to the second position.

3. The lock according to claim 1 or 2, wherein the mechanical switch is a micro switch.

4. The lock according to claim 3, wherein the trigger portion includes a small diameter portion, a large diameter portion, and a connecting portion connecting the small diameter portion and the large diameter portion,

the maximum distance from the outer peripheral surface of the small diameter portion to the rotation center of the cam is smaller than the minimum distance from the outer peripheral surface of the mechanical switch to the rotation center of the cam, and

the maximum distance from the outer peripheral surface of the large diameter portion to the rotation center of the cam is greater than the minimum distance from the outer peripheral surface of the mechanical switch to the rotation center of the cam.

5. The lock according to claim 1 or 2, wherein the locking assembly comprises an armature and a solenoid, the armature being retractable under the influence of the solenoid,

the solenoid is de-energized when the trigger assembly is triggered and energized when the trigger assembly ceases to be triggered and when the lock is to be unlocked,

when the electromagnetic coil is de-energized, the armature falls and locks the cam,

when the solenoid is energized, the armature is attracted and unlocks the cam.

6. The lock according to claim 5, wherein the cam further comprises a first step formed by forming a step structure on a periphery of the cam,

when the electromagnetic coil is deenergized, the armature falls down and abuts against the first step portion to lock the cam.

7. The lock according to claim 6, wherein the first step includes a first face parallel to a central axis of the armature when the cam is in the second position and a second face perpendicular to the first face and parallel to an end face of the armature,

when the electromagnetic coil is de-energized, the armature falls to a position in abutment with the first face and the second face.

8. The lock according to claim 6, wherein the cam further includes a second step portion formed by forming a step structure on a peripheral edge of the cam, the second step portion being formed on an upstream side of the first step portion in a direction in which the cam rotates from the second position to the first position,

when the cam rotates to the first position, the second step portion abuts against the armature.

9. The lock of claim 7, wherein the cam comprises a first cam and a second cam, the trigger assembly comprising a first trigger assembly disposed for the first cam and a second trigger assembly disposed for the second cam.

10. The lock according to claim 9, wherein the first and second cams are configured to be line symmetric with respect to a central axis of the armature,

when the electromagnetic coil is de-energized, the armature falls to a space formed by the first and second faces of the first cam and the first and second faces of the second cam to lock the first and second cams simultaneously.

11. A shielding door comprising a lock according to any one of claims 1 to 10 and a door body slidable between an open position and a closed position, the locked member being secured to the door body,

when the door body is in the open position, the cam is in the first position,

when the door body is in the closed position, the cam is in the second position,

during sliding of the door body from the open position to the closed position, first the locked member engages the engagement portion of the cam, then the locked member rotates the cam from the first position to the second position, and

during the sliding of the door body from the closed position to the open position, the locking assembly is unlocked first, and then the locked member drives the cam to rotate from the second position to the first position and then is separated from the cam.