JP2877394B2 - Tablets - Google Patents

Description

Description: BACKGROUND OF THE INVENTION (Industrial application field) The present invention relates to a lock, and more particularly, to a lock having a two-stage protruding type, exhibiting a dead locking function by closing a door, and having a separate dead bolt. However, the present invention relates to a device in which the dead bolt is automatically protruded by a door closing operation and a dead locking function is exhibited.

(Prior Art) In the case of a lock, for example, a hotel lock used for a hotel door, etc., after entering the designated room after opening the door, the door is closed.
The door-side latch is configured to protrude into a recess formed in the strike of the vertical frame to be in a locked state, so that the door can be automatically locked.

(Problems to be Solved by the Invention) However, according to the above-described conventional configuration, the latching amount of the latch with respect to the strike is small, so that it cannot be said that the locked state is ensured. So, in order to secure the lock, apart from the automatic lock of the latch obtained by the door closing operation, manually rotate the thumb turn from the indoor side,
There has been proposed a so-called double lock in which a deadbolt other than the latch projects into another recess formed in the strike. However, the rotation operation of the thumb turn by the hotel user after entering the room is complicated, and if the rotation operation of the thumb turn is neglected, a sufficient security function cannot be exhibited.

Thus, as disclosed in Japanese Utility Model Application Laid-Open No. 58-62749, it has been considered that the latch is formed as a two-stage projecting type and the projecting amount in the case of dead locking is increased. However, it cannot be said that the lock state is still reliable, and improvement is required.

The present invention has been made based on such a point, and the object thereof is to provide a latch having a two-stage projecting type and having a function as a deadbolt, separately providing a deadbolt, and An object of the present invention is to provide a lock in which a dead bolt is automatically protruded and locked by a door closing operation.

(Means for Solving the Problems) In order to achieve the above object, a lock according to the present invention is housed in a housing incorporated in a door so as to be able to protrude and retract in a vertical frame direction, and is retracted into the housing when the door is opened. A dead bolt that is protruded by elastic force at the time of closing the door and engages with the vertical frame to apply dead locking; and a dead bolt position holding means provided in the housing and holding the dead bolt at a retracted position at the time of opening the door. Inside the housing, it is housed so as to be able to protrude and retract in the vertical frame direction, protrudes by A from the housing when the door is opened, is pushed back into the housing by a strike provided on the vertical frame side when the door is closed, and along the strike recess. A latch that protrudes by B larger than A to apply dead locking; and a latch that is provided in the housing and that is positioned at the amount of protrusion A when the door is opened. A latch position holding means for placing and holding, a trigger which is housed inside the housing so as to be able to protrude and retract in a vertical frame direction, protrudes from the housing when the door is opened, and is pushed back by a strike at the time of closing the door, and provided in the housing. When the door is closed, the latch and the trigger are pushed back by the strike and only the latch protrudes along the strike recess, and the latch position is held by the latch position holding means using the change in the positional relationship between the latch and the trigger. Release means to allow the latch to protrude up to the protrusion amount B and release the dead bolt position holding means by the dead bolt position holding means to allow the dead bolt to protrude. And a means for holding a dead-locking position of the latch that holds the latch at the position of the amount B. It is intended to.

(Operation) First, when the door is opened, the deadbolt is retracted into the housing, and is held at the retracted position by deadbolt position holding means. The latch is located at a position protruding from the housing by the protrusion amount A in the vertical frame direction, and the position is held by the latch position holding means. The trigger is in a state of protruding from the housing in the vertical frame direction. When the door is closed in this open state, that is, when the door is closed, the above members operate as follows.

First, the latch and the trigger are pushed back in the housing direction by strikes provided on the vertical frame side. At that time, the strike corresponding to the position of the latch is formed with a concave portion, so that the latch once pushed back starts to protrude in the vertical frame direction along the concave portion, but the strike corresponding to the position of the trigger does not. Since the concave portion is not formed, a positional shift occurs between the latch and the trigger, and the operating means functions due to the positional shift. That is, the holding of the latch position by the latch position holding means is released by the action means. Therefore, the latch is protruded in the vertical frame direction at the same time as the latching, and at the same time, the dead locking is applied by the dead locking position holding means, and the dead locking position of the latch is reliably held.

The action means simultaneously releases the dead bolt position holding by the dead bolt position holding means. Thus, the dead bolt projects in the vertical frame direction and engages with the vertical frame.
As a result, dead rocking by the dead bolt is applied.

That is, only by the simple closing operation of closing the door, not only the deadlock by the latch but also the deadlock by the separately provided deadbolt can be applied.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS.

First, the configuration and operation when the door is closed from the open state will be described.

FIG. 1 is a plan view showing an open state of the hotel lock 1 according to the present embodiment, and FIG. 2 is a front view. This hotel lock 1
Is installed near the vertical frame 5 of the door 3 as shown in FIG.

The structure of the hotel lock will be described below. First, as shown in FIG. 1, a housing 7 is provided, and a deadbolt 9 is arranged on the upper side of the housing 7 and on the side of the vertical frame 5. ing. The dead bolt 9 has locking projections 9a and 9b at its lower part, and has locking projections 9c at its upper part. Then, at a position flush with the front 11, the position of the locking projection 9b is held by engaging with a hook (dead bolt position holding means) 13. The hook 13 is attached so as to be rotatable about a shaft 15.

A lever 17 is rotatably attached to the housing 7 via a bearing 21. One end 17a of the lever 17 is in contact with the rear end of the dead bolt 9, and a spring guide 23 is connected to the other end 17b. Spring guide above
A compression coil spring 25 is mounted on 23. The lever 17 is moved by the compression coil spring 25
The circumference of the bearing 21 is always urged to rotate counterclockwise in FIG. 1, whereby the dead bolt 9 is always urged leftward in the figure.

At the center of the housing 7 and on the side of the vertical frame 5, a latch 27 is disposed so as to be slidable in the left-right direction in the figure. The above latch
27 is fixed to the tip of the latch bolt 109. or,
The latch 27 is always elastically urged leftward in the figure by a compression coil spring 29 stretched between a latch holder 31 fixed to the latch bolt 109 and a support member 32 fixed to the housing 7. ing. The latch holder 31 is
It is connected to hook 35 via 33. The latch holder 31 has a foot 31a.

The hook 35 is engaged with a lock 37 fixed to the housing 7, and the hook 35 and the lock 37
It constitutes a latch position holding means. The latch 27 is held at a position 8 mm from the end face of the front 11 (first-stage protruding position, protruding amount A) via the latch holder 31 by the latch position holding means. That is, the latch 27
Is biased to the left by the compression coil spring 29, the latch holder 31 integral with the latch 27 is also biased to the left, and the hook 35 connected to the latch holder 31 is also biased to the left. Move the hook 35 to the left
Therefore, the latch 27 is held at the first-stage position described above.

A torsion coil spring 38 is mounted on the shaft 33, and the hook 35 is constantly urged to rotate clockwise in FIG. 1 by the torsion coil spring 38.

At a position below the latch 27, a trigger 39 is disposed so as to be slidable in the left-right direction in the figure. Trigger 39 above
Is fixed to the tip of the trigger bolt 40. A stopper 42 is fixed to the trigger bolt 40, and a compression coil spring 41 is stretched between the stopper 42 and the support member 44 fixed to the housing 7. A support member 44 is fixed to the housing 7 to support the trigger bolt 40 and to form a spring seat for the compression coil spring 41.

The trigger 39 is constantly urged to the left in the figure by the compression coil spring 41, and the amount of protrusion is regulated to a certain amount by the front end surface of the stopper 42 abutting on the front 11. . Also, trigger 39
At the rear end, a trigger tail 43 is provided.

The hook 13 has a slot 13a formed therein, and a pin 45 extending from the rotating bracket 47 is inserted into the slot 13a, whereby the hook 13 is connected to the rotating bracket 47 via the pin 45. The rotating bracket 47 is mounted so as to be rotatable about the shaft 15 already described. The rotating bracket 47 is connected to a dead bolt trigger 51 via an arm 49 and a shaft 50. The dead bolt trigger 51 is in a state of being connected to the above-described latch holder 31 via the shaft 33. The deadbolt trigger 51 is provided so as to be rotatable around the axis 33. The rotating bracket 47, the arm 49, the deadbolt trigger 51 and the like constitute an operation means. The arm 49 is always urged downward by the torsion coil spring 53 in FIG. The deadbolt trigger 51 is in contact with the trigger tail 43, thereby restricting the movement of the arm 49 in the downward direction in the drawing.

A latch stopper 55 is mounted above the latch 27 so as to be rotatable about a shaft 57, and is constantly urged by a torsion coil spring 59 in a counterclockwise direction in the figure.

Further, a dead bolt stopper 61 is mounted so as to be rotatable about the shaft 15 and is in contact with the latch stopper 55. By the counterclockwise rotation of the latch stopper 55 by the torsion coil spring 59, the deadbolt stopper 61 is urged clockwise in the drawing when the latch 27 described later projects.

Note that a solenoidal mechanism 63 is housed and arranged at a lower portion of the housing 7. The solenoid mechanism 63 functions when the door is opened from the outdoor side.

An operation when the door is closed from the open state based on the above mechanism will be described.

First, when the door is opened, it is in a state as shown in FIG.
Latch 27 and trigger 39 are both 8mm from front 11
It is in a protruding state only.

From this state, the door 3 is gradually closed. This closing causes the latch 27 and the trigger 39 to move as shown in FIG.
Is gradually pushed back by the strike 62 on the vertical frame 5 side.

At this time, a recess having a predetermined depth is formed at the position of the strike latch 27. Therefore, when the latch 27 approaches the recess position, the latch 27 once pushed back is returned.
Is pushed out by the elastic force of the coil spring 29.

On the other hand, such a recess is not formed at the position of the trigger 39 of the strike 62, so that the trigger
39 remains pushed back by strike 62, leaving latch 27 pushed 2 mm beyond trigger 39.

In this state, since the dead bolt trigger 51 is in contact with the trigger tail 43, the dead bolt trigger
The rotation of the shaft 51 around the axis 33 is prevented, but as shown in FIG.
It becomes possible to rotate further around the shaft 33 clockwise in the figure.

The rotation of the dead bolt trigger 51 causes the arm 49 to rotate.
Moves downward in the drawing, and the arm 49 moves through the shaft 50.
Is rotated clockwise about the shaft 15. Thereby, the rotating bracket via the pin 45
The hook 13 connected to 47 also rotates around the shaft 15 in the clockwise direction in the figure.

By the rotation of the hook 13, as shown in FIG.
The engagement between the hook 13 and the locking projection 9b of the dead bolt 9 is released. Therefore, as shown in FIG. 5, the dead bolt 9 is pushed out to the left in the drawing by the urging force of the compression coil spring 25 via the lever 17 to be in a dead rocking state.

On the other hand, regarding the latch 27, as shown in FIG. 4, the locking portion 35a of the hook 35 is moved upward in the drawing against the elasticity of the torsion coil spring 38 by the inclined portion 43a of the trigger tail 43. Pushed up. Therefore, the latch 27 reaches the recess of the strike 62 of the vertical frame 5 and the compression coil spring 29
When the latch 27 is pushed into the recess by the biasing force of
Even if it is pushed out to the position of 8 mm in the figure (first-stage projection shown in FIG. 1), the hook 35 does not engage with the locking metal fitting 37, and further projection is not hindered.

Accordingly, the latch 27 is further pushed to the left in the drawing by the resilience of the compression coil spring 25, and the foot 31a of the latch holder 31 is moved to the front 11 as shown in FIG.
Move to the position where it touches. In this state, the latch 27 is located at a position protruding from the front 11 by 15 mm. (latch
27 second-stage protrusion, protrusion amount B). At the same time that the latch 27 projects to the second stage, the latch stopper 55 engages with and holds the latch 27 in the leftward projecting position in the drawing, thereby providing a dead locking state of the latch 27. . The position where the dead bolt 9 protrudes leftward in the figure is held by the engagement of the dead bolt stopper 61 and the locking projection 9a as shown in FIG. That is, FIG.
In the state shown in the figure, the latch stopper 55 is in sliding contact with the upper surface of the latch 27. However, when the latch 27 is in the second stage of protruding state as shown in FIG. Is finished and the latch stopper 55 is coil spring 59
As a result, the latch 27 rotates counterclockwise, and is located at a position facing the rear end surface of the latch 27. Therefore, the latch stopper 55 constitutes a latch deadlock position holding means for holding the second protruding position of the latch 27. Due to the counterclockwise rotation of the latch stopper 55, the dead bolt stopper 61 rotates clockwise, and engages with the rear end face of the locking projection 9a of the dead bolt 9. Therefore, the dead bolt is also held at the projecting position.

As described above, by the door closing operation, the latch 27 is protruded to the second stage to perform the dead locking, and the separately provided dead bolt 9 is automatically protruded to perform the dead locking.

Next, the configuration for opening the door from the indoor side from the closed state
The operation will be described.

First, as shown in FIG. 3, on the indoor side and the outdoor side,
Lever handles 81 and 83 are attached. These lever handles 81 and 83 are returned to a non-operation position (horizontal position) by a spring (not shown).

As shown in FIG. 8, a square 85 is connected to the lever handle 81 on the indoor side. When the lever handle 81 is rotated, the square 85 is rotated.

A rotating bracket 87 is connected to the square core 85, and the rotating bracket 87 is connected to a lever 89 (a seventh
(Shown in the figure) are connected. Therefore, by rotating the lever handle 81 on the indoor side, the lever 89
Rotates around the bearing 21.

FIG. 6 is a view showing a closed state, and FIG. 7 is a view showing a state in which parts such as a hook 13, a rotary fitting 47, and a part of a lever 17 have been removed from FIG. In these figures,
A pin 91 is fixed to the end of the lever 89.
Is provided so that the tail part 61a of the deadbolt stopper 61 can abut. By the way, the lever 89 has the lever 93
It is fixed by a book screw 95, so that the lever 93 is provided so as to be integrally rotatable by the rotation of the lever 89.
Further, a pin 97 is integrally provided from the lever 89, and the pin 97 also rotates. The pin 97 is engaged with an arc-shaped slot 98 formed in the lever 17, and is configured such that the pin 97 comes into contact with the end of the slot 98 of the lever 17 when rotated clockwise by 5 °. Have been. Therefore, lever 89 is 5 °
By rotating as described above, the rotation is transmitted to the lever 17.

The shaft 101 provided at the tip of the lever 17 has a lever 9
9 are provided. That is, one end of the lever 99 is connected to the lever 17 via the shaft 101, and the other end of the lever 99 is connected to the pin 10
It is connected to the edge projection 9e of the dead bolt 9 through the pin 4. (The tip 17a of the lever 17 is located in a recess defined between the rear end face 9d of the dead bolt 9 and the edge projection 9e.
As described above, the dead bolt 9 is urged leftward by the compression coil spring 25. ) And lever 99
The torsion coil spring 103 is always biased to rotate counterclockwise in the figure.

A pin 105 protrudes from the lever 89, and the pin 105 is disposed in contact with a metal fitting 107 connected to the latch 27 via a latch bolt 109. The hook 13 is provided with the torsion coil spring 111 so that the hook 13 is urged counterclockwise.

An L-shaped bracket 113 is provided above the above-described housing 7 and is configured to be able to abut on the above-described dead bolt 9.

In the above configuration, when the indoor lever handle 81 is rotated from the closed state shown in FIGS. 6 and 7, the lever 89 rotates clockwise about the bearing 21 in FIG. By the rotation of the lever 89, the tail of the dead bolt stopper 61 is moved by the pin 91 fixed to the lever 89.
61a is pushed upward in the drawing, whereby the dead bolt stopper 61 rotates counterclockwise in FIG. 7 against the biasing force of the torsion coil spring 59 via the latch stopper 55.

The counterclockwise rotation of the dead bolt stopper 61 causes the latch stopper 55 to rotate clockwise against the urging force of the torsion coil spring 59 in FIG. By the rotation of the dead bolt stopper 61 and the latch stopper 55, the stopper function for the dead bolt 9 and the latch 27 is released, and the returning operation of the dead bolt 9 and the latch 27 is allowed. This state is shown in FIG.

When the lever 89 is turned by 5 ° from the closed state, the lever 89 is turned in FIG. 9, and the lever 93 is turned, and the pin 97 integrally fixed (FIG. 7)
Also rotates. The pin 97 is engaged with a slot 98 formed in the lever 17. When the pin 97 rotates by 5 ° as described above, the pin 97 comes into contact with the end of the slot 98 of the lever 17. Therefore, when the lever 89 rotates by 5 ° or more, the rotation is transmitted to the lever 17.

When the lever 89 further rotates, as shown in FIG. 10, the lever 17 rotates clockwise in FIG.
With the rotation of the 17, the dead bolt 9 is
Begins to be drawn in.

When the lever 89 further rotates, as shown in FIG.
The pin 105 fixed to the lever 89 comes into contact with the metal fitting 107 (FIG. 7), and starts to be pulled in. Since the metal fitting 107 is connected to the latch 27 via the latch bolt 109, the latch 27 is retracted against the elastic force of the compression coil spring 29.

When the lever 89 is further rotated, the dead bolt 9 and the latch 27 are gradually retracted, and as shown in FIG. 11, the end of the latch 27 reaches a position protruding 6 mm from the front 11. In this state, as shown in the figure, the dead bolt 9 is in a completely retracted state. or,
Since the hook 13 is urged in the counterclockwise direction in the figure by the torsion coil spring 111, the hook 13 engages with the locking projection 9b of the dead bolt 9, and holds the dead bolt 9 in the retracted position.

Here, the reason why the dead bolt 9 is completely retracted at the position where the end of the latch 27 projects by 6 mm from the front 11 will be described.

In the case of this embodiment, the gap between the door 3 and the vertical frame 5 (FIG. 3) (usually referred to as vertical dust) is 6 mm.
Assuming that the dead bolt 9 and the latch 27 are pulled into the housing 7 at the same timing, if they are pulled in a state of 6 mm or less (for example, 5 mm), the door can be opened. When the door can be normally opened, the door 3 is pushed and the door is opened.

However, when the door is opened in this state and the lever handle 81 is opened, the lever handle 81 automatically returns to the original horizontal position by the elastic force of a spring (not shown). At this time, if the dead bolt 9 is not completely retracted and is not held in position by the hook 13, the dead bolt 9
Will protrude again by the compression coil spring 25.

Therefore, immediately before the door can be opened, the dead bolt 9 is completely retracted before the latch 27 is completely retracted, thereby preventing the above-described inconvenience.

When the lever 89 is further rotated, the latch 27 is completely retracted via the pin 105 and the metal fitting 107 as shown in FIG. In addition, since the upper locking projection 9c of the dead bolt 9 abuts on the L-shaped bracket 113 attached to the housing 7, the further retraction is restricted. In this state, the door 3 can be rotated from the indoor side.

When the door is opened, as shown in FIG.
It is pushed out by the compression coil spring 41. or,
When the lever handle 81 on the indoor side returns to the original position, the lever 89 is moved by the coil spring 103 (FIGS. 6 and 10).
Returns to the position shown in FIG. Further, the latch 27 is pushed out by the coil spring 29. At this time, since the hook 35 engages with the locking fitting 37, the latch 27 stops at a position protruding 8 mm from the front 11. The above is the door opening operation by the operation from the indoor side.

Next, a case where the door is opened from the outdoor side will be described. In addition to the mechanical components described above, when the door is opened from the outdoor, a switch spring 119, a clutch fitting 121, a rotating fitting 117 having a locking portion 127, and a pin 131 function.

First, as shown in FIG. 8, an outdoor lever handle
The rotating bracket 117 is connected to the 83 via a square core 115. As shown in FIGS. 13 and 14, a switch spring 119 is attached to the solenoid 63, and the clutch fitting 121 is attached between the lever 89 and the lever 93 so as to be vertically movable. , A locking portion 129 is formed. Further, the rotating bracket 117 is connected to the lever handle 83 and is rotatably mounted by rotating the lever handle 83. An engaging portion 127 is formed on the rotating metal 117, and is configured to be engageable with the engaging portion 129 of the clutch metal 121. The lever 93 has a pin 131 projecting therefrom, and the pin 131 is configured to be able to engage with the switch spring 119.

In the above-described configuration, simply rotating the outdoor-side lever handle 83 in the door-closed state requires the rotation bracket.
117 only spins, never opens. To open the door, first, a card representing a key unique to the own room is inserted into a card reader (not shown).
When the state becomes “OK” after inserting the card, the solenoid unit 63 is energized. The energization of the solenoid 63 changes the state shown in FIG. 13 to the state shown in FIG. That is, the switch spring 119 is moved by the excitation of the solenoid 63 and pushes up the clutch fitting 121 upward.

When the lever handle 83 on the outdoor side is rotated in this state, the locking portion 127 of the rotating metal member 117 comes into contact with the locking portion 129 of the clutch metal member 121, and pushes the clutch metal member 121 leftward in the drawing. The movement of the clutch fitting 121 causes the lever 8 to move.
9 and 93 are rotated, whereby the unlocking is performed by the same operation as the unlocking operation from the indoor side.

As shown in FIG. 14, the rotation of the lever 93 causes the pin 131 to push down the switch spring 119, whereby the solenoid 63 returns to the state shown in FIG.

[Effects of the Invention] According to the present embodiment, the following effects can be obtained.

First, the latch 27 is of a two-stage projecting type, and is projected to the two-stage projecting position when the door is closed. At the same time, the latch stopper 55 is engaged with and held by the latch 27 so that dead locking can be applied.

Further, the dead bolt 9 is provided separately from the latch 27, and the dead bolt 9 is automatically projected by the door closing operation, so that the dead bolt 9 can be locked simultaneously with the closing of the door.

As described above, the door can be locked by both the latch 27 and the dead bolt 9 by simply performing the door closing operation, and can be automatically locked by the door closing operation.
You will not forget to lock it, and it will be superior in crime prevention. Further, the protruding positions of the latch 27 and the dead bolt 9 are held by the dead lock position holding means (latch stopper 55) and the dead bolt stopper 61, respectively, so that the locked state is guaranteed.

When the door is opened from the indoor side, not only the latch but also the deadbolt 9 can be retracted simply by operating the lever handle 81 on the indoor side. Since the retraction timing of the latch 27 is shifted by a predetermined amount, it is possible to prevent the dead bolt 9 from inadvertently protruding after the door is opened.

In addition, when the door is opened from the outside of the room, a driving means such as a solenoid is operated by a combination of a card reader and a card, for example, and the same operation as the door opening operation from the inside of the room can be achieved.

As described in detail above, according to the lock according to the present invention, the latch is made to project two steps, and when the door is closed, it is made to project to the two-step projecting position to apply dead locking, and a separately provided dead bolt is automatically projected by the door closing operation. Let me
Dead rocking is also applied by this
Therefore, a double dead-locking state can be provided by an extremely simple operation of simply closing the door, and an excellent security function can be exhibited.

[Brief description of the drawings]

1 to 14 are views showing an embodiment of the present invention. FIG. 1 is a plan view of a hotel lock in an open state, FIG. 2 is a front view of the hotel lock in an open state, FIG. Is a top view of the hotel lock and its vicinity immediately before the door is closed, FIGS. 4 and 5 are plan views of the hotel lock sequentially showing the locking operation by the door closing operation, and FIG. 6 explains the unlocking operation from the indoor side. FIG. 7 is a plan view of the hotel lock with the door closed, FIG. 7 is a plan view of the hotel lock shown with a part removed from FIG. 6, FIG. 8 is a cross-sectional view showing the mounted state of the lever handle, FIG. FIG. 12 is a plan view of the hotel lock showing the unlocking operation when the door is opened from the indoor side, and FIGS. 13 and 14 are plan views of the hotel lock showing the unlocking operation when the door is opened from the outdoor side. is there. 1: Hotel lock, 3: Door, 5: Vertical frame, 7: Housing, 9: Dead bolt, 13: Hook, 27: Latch, 35: Hook, 37 ...
Locking bracket, 39… Trigger, 47… Rotating bracket, 49… Arm,
51 ... Deadbolt Trigger

Claims (1)

(57) [Claims] 1. A housing which is accommodated in a housing incorporated in a door so as to be able to protrude and retract in a vertical frame direction, retreats into the housing when the door is opened, and is protruded by an elastic force when the door is closed to engage with the vertical frame. A deadbolt for deadlocking, deadbolt position holding means provided in the housing and holding the deadbolt at a retracted position when the door is opened, and housed in the housing so as to be able to protrude and retract in the vertical frame direction. When the door is opened, it protrudes by A from the housing, and when the door is closed, it is pushed back into the housing by a strike provided on the vertical frame side, and along the recess of the strike, B larger than A above.
A latch that protrudes only to perform dead locking; a latch position holding means that is provided in the housing and holds the latch at the position of the protrusion amount A when the door is opened; A trigger that is housed and protrudes from the housing at the time of opening and is pushed back by a strike at the time of door closing operation, and a latch and a trigger provided within the housing and pushed back by the strike at the time of door closing operation, and only the latch is along the recess of the strike. Using the change in the positional relationship between the latch and the trigger caused by the protrusion, the position holding of the latch by the latch position holding means is released to allow the latch to protrude up to the protrusion amount B, and the dead bolt position holding means Action means for releasing the position of the dead bolt by allowing the dead bolt to protrude, A lock for holding the latch at the position of the amount of protrusion B when the door is closed.