JP7743390B2 - Locks and safes - Google Patents

Description

The present invention relates to a locking device for locking a door and a safe.

A safe for storing currency has a housing that stores currency and has an opening for removing the stored currency, and a door that can be opened and closed to cover the opening. The door is equipped with a latch. The latch is movable between an open position, where the door can be opened, and a closed position, where it prevents the door from opening. In the closed position, the latch engages with a part of the housing, for example, to prevent the door from opening.

The safe is equipped with a locking device. The locking device includes a locking hardware that abuts against the latch in the closed position, restricting the latch from moving to the open position, thereby locking the door so that it cannot be opened. When the locking hardware moves to a position where it no longer abuts the latch, the safe enters an unlocked state in which the door can be opened.

Some safe doors have locking hardware that is electromagnetically controlled. When an unlocking operation is received, a solenoid, for example, is energized and the locking hardware is moved to the unlocked position. This allows the latch to be moved to the open position, opening the door. Then, when it is detected that the latch has moved to the closed position, the solenoid is de-energized and the locking hardware is moved to the locked position, locking the door.

For example, the position of the latch is detected by a switch with a contact (see, for example, Patent Document 1). The switch has a movable part, and the contact is switched on and off in conjunction with the movement of the movable part. For example, when the switch contact is on, it detects that the latch is in the open position, i.e., the door is open, and when the switch contact is off, it detects that the latch is in the closed position, i.e., the door is closed.

For example, the latch has a contact portion that contacts and pushes in against the movable portion of the switch when it is in the open position, turning the contacts on. As the latch moves toward the closed position, the contact portion also moves, releasing the movable portion and turning the contacts off.

Japanese Patent Application Publication No. 8-144591

In the prior art described above, due to manufacturing errors in the latch and misalignment of the movable part that turns the switch on and off, there is a risk that the switch will turn off before the latch reaches the closed position, i.e., before the door is closed, resulting in the door being erroneously detected as closed. In this case, because the latch has not reached the closed position, for example, part of the latch may remain in the path of the locking fitting, preventing the locking fitting from reaching the locked position.

In this state, if the solenoid is demagnetized and the locking hardware is moved to the locked position, the locking hardware cannot reach the locked position, and so the latch can be moved to the open position even though the locked state is detected. This creates a problem in that if the latch is moved to the open position, an alarm will be sounded, indicating that the door has been forced open while locked.

The disclosed technology has been developed in light of the above, and aims to provide a locking device that can prevent a door from being erroneously detected as being in a closed state before the latch that switches the door between an open and closed state reaches the closed position.

One aspect of the locking device disclosed in the present application is a locking device for locking a door that blocks an opening, comprising: a latch that is movable between an open position where the door can be opened and a closed position where the door is restricted from being opened; a locking unit that is movable between a locked position where the latch is restricted from moving from the closed position to the open position and an unlocked position where the latch is permitted to move from the closed position to the open position; an interlocking unit that moves from a first position to a second position as the latch moves from the closed position to the open position; and a locking unit that determines whether the door is closed or not based on the position of the interlocking unit. and a switch that detects whether the latch is open. The first range of movement of the latch from the closed position to the open position is divided into a first range of movement from the closed position to the open position and a second range of movement that is closer to the open position than the first range of movement. The latch is provided with a first abutment that does not abut the interlocking part when moving through the second range of movement as the latch moves from the open position to the closed position, but abuts the interlocking part when moving through the first range of movement, moving the interlocking part from the second position to the first position.

One aspect of the locking device disclosed in this application can prevent the door from being erroneously detected as being in a closed state before the latch that switches the door between an open and closed state reaches the closed position.

FIG. 1 is a perspective view of a safe according to an embodiment, showing a state in which the door is closed. FIG. 2 is a perspective view of the safe according to the embodiment, showing a state in which the door is open. FIG. 3 is a view of the door in the embodiment as seen from the rear side. FIG. 4 is a diagram schematically illustrating the relationship between the latch and the recess when the latch is in the closed position in the embodiment. FIG. 5 is a diagram schematically illustrating the relationship between the latch and the recess when the latch is in the release position in the embodiment. FIG. 6 is an enlarged view of part A shown in FIG. 3, showing the locked state. FIG. 7 is an enlarged view of part A shown in FIG. 3, showing the unlocked state. FIG. 8 is an enlarged view of part A shown in FIG. 3, showing the state in which the latch is in the open position and the interlocking portion is in the first position. FIG. 9 is an enlarged view of part A shown in FIG. 3, showing the state in which the latch is in the open position and the interlocking portion is in the second position. FIG. 10 is an enlarged view of part A shown in FIG. 3, showing the state in which the latch is positioned at the boundary between the first and second movement ranges in the process of moving from the open position to the closed position. FIG. 11 is a front view of the holding portion in the embodiment. FIG. 12 is a side view of the holding portion in the embodiment. FIG. 13 is a diagram showing a modification of the locking device in the embodiment.

Below, examples of the currency handling device disclosed in this application are described in detail with reference to the drawings. Note that the currency handling device disclosed in this application is not limited to the following examples.

(safe)
Fig. 1 is a perspective view of a safe according to an embodiment, showing a state in which the door is closed. Fig. 2 is a perspective view of a safe according to an embodiment, showing a state in which the door is open. Note that the safe includes containers and devices in general that store currency inside a housing. For example, a deposit machine that stores sales proceeds, an automated teller machine, and other currency handling devices are also included in the safe.

In Figure 1, the width direction of the safe is the X-axis direction, the front-to-back direction is the Y-axis direction, and the height direction is the Z-axis direction. In Figures 1 and subsequent figures, the X-axis, Y-axis, and Z-axis directions are shown as in Figure 1. Furthermore, when viewing the safe from the front, the left is the positive direction along the X-axis, and the right is the negative direction along the X-axis.

Safe 1 comprises a housing 2 with an opening 2b formed in part of the front surface 2a, and a door 3 that can be opened and closed to cover opening 2b. Safe 1 is a container that stores and keeps coins inside housing 2. Door 3 can be locked by a locking device, which will be described later. In this description of the present embodiment, "door 3 is closed" simply means that door 3 is blocking opening 2b, and the position of the latch, which will be described later, is not limited. In this description of the present embodiment, "door 3 is open" simply means that door 3 is not blocking opening 2b, and the position of the latch, which will be described later, is not limited.

An operation unit 4 that can be operated by the user of the safe 1 is provided on the top surface 2c of the housing 2. For example, the operation unit 4 is a touch panel. The operation unit 4 is operated, for example, when unlocking the door 3. When an unlocking operation is performed using the operation unit 4, an unlock signal is sent to the locking device, which will be described later.

A banknote deposit slot 5 and a coin deposit slot 6 are provided on the front surface 2a of the housing 2. In the safe 1, banknotes inserted into the banknote deposit slot 5 are stored inside the housing 2 through the banknote deposit slot 5. In the safe 1, coins inserted into the coin deposit slot 6 are stored inside the housing 2 through the coin deposit slot 6. Of the sides surrounding the opening 2b of the housing 2, one side on the negative side along the X axis has multiple recesses 2d formed in it.

The door 3 is rotatably attached to the side of the housing 2 that surrounds the opening 2b and is opposite the side on which the recess 2d is formed. The end of the door 3's outer edge that is attached to one side of the opening 2b is the fixed end, and the side opposite the fixed end is the free end. Furthermore, the surface that faces forward when the door 3 is closed is the front surface 3c, and the back side is the back surface 3d.

Figure 3 is a view of the door in this embodiment from the back side. A locking device 7 is provided on the back side 3d of the door 3. The locking device 7 includes a latch 8, a locking unit 9, a solenoid 10, a link mechanism 11, a switch 12, an interlocking unit 13, a retaining unit 14, and a biasing unit 15. Note that in the view of the door 3 from the back side 3d as in Figure 3, the X-axis, Y-axis, and Z-axis are shown when the door 3 is closed, and this also applies to subsequent figures.

The latch 8 is provided on the back surface 3d of the door 3. The latch 8 is provided so that it can slide in the direction along the X-axis. The latch 8 can be moved by operating a lever 16 provided on the front surface 3c of the door. When the latch 8 is moved in the positive direction along the X-axis, it is in a closed position, which prevents the door 3 from opening. When the latch 8 is moved in the negative direction along the X-axis, it is in an open position, which allows the door 3 to open. The latch 8 has multiple protrusions 8a formed on the end facing the positive direction along the X-axis.

Figure 4 is a diagram showing the relationship between the latch and the recess when the latch is in the closed position in this embodiment. Figure 5 is a diagram showing the relationship between the latch and the recess when the latch is in the released position in this embodiment. Figures 4 and 5 show the latch 8 and the housing 2 as viewed along the Z axis.

As shown in Figure 4, when the latch 8 is in the closed position, the protrusion 8a formed on the latch 8 is inserted into the recess 2d formed on the edge of the opening 2b of the housing 2. In this state, even if an attempt is made to open the door 3 by pulling the free end of the door 3 in the negative direction along the Y axis, the protrusion 8a gets caught inside the recess 2d, preventing the door 3 from opening. In other words, when the latch 8 is in the closed position, the protrusion 8a is inserted into the recess 2d, restricting the door 3 from opening and keeping it closed.

As shown in Figure 5, when the latch 8 moves from the closed position to the released position, the protrusion 8a that was inserted into the recess 2d moves out of the recess 2d. In this state, if the free end of the door 3 is pulled in the negative direction along the Y axis, the protrusion 8a will no longer be caught inside the recess 2d, allowing the door 3 to open. In other words, when the latch 8 is in the released position, the protrusion 8a moves out of the recess 2d, putting the door 3 in an open state where it can be opened.

Figure 6 is an enlarged view of part A shown in Figure 3, showing the locked state. Figure 7 is an enlarged view of part A shown in Figure 3, showing the unlocked state.

A bar recess 8b is formed on the upper edge 8f of the bar 8, recessed from top to bottom. The inner surface of the bar recess 8b facing the positive direction along the X axis serves as a restricting surface 8c that abuts against the locking unit 9, described below. In this embodiment, the bar recess 8b is formed by providing a step on the end of the upper edge 8f of the bar 8 facing the positive direction along the X axis.

The latch 8 is formed with a first contact portion 8d that contacts the interlocking portion 13 and moves the interlocking portion 13 in conjunction with the movement of the latch 8. Details of the movement of the interlocking portion 13 in conjunction with the movement of the latch 8 will be explained later.

The latch 8 is formed with a second abutment portion 8e that abuts against the retaining portion 14 and moves the retaining portion 14 as the latch 8 moves. Details of the movement of the retaining portion 14 as the latch 8 moves will be explained later.

As mentioned above, the movement range of the latch 8 is between the closed position and the open position. The movement range of the latch 8 is divided into a first movement range R1, which is a fixed range from the closed position toward the open position, and a second movement range R2, which is closer to the open position than the first movement range R1. In the drawings, the first movement range R1 and the second movement range R2 are indicated by the movement range of the first abutment portion 8d.

The locking unit 9 is a member that prevents the latch 8 from moving from the locked position to the unlocked position, thereby creating a locked state in which the door 3 cannot be opened even if an attempt is made to operate the lever 16. The locking unit 9 is held in place by a guide member 17 so that it can move up and down.

When the locking unit 9 is moved downward, it is in the locked position. As shown in Figure 6, when the locking unit 9 is in the locked position, it is inserted into the latch recess 8b of the latch 8, which is in the closed position. In this state, even if an attempt is made to move the latch 8 to the unlocked position, the restricting surface 8c abuts against the locking unit 9, preventing the latch 8 from being moved to the unlocked position. In other words, when the locking unit 9 is in the locked position, the door 3 cannot be opened even by operating the lever 16, resulting in a locked state.

When the locking unit 9 is moved upward, it is in the unlocked position. As shown in Figure 7, the locking unit 9 in the unlocked position is out of the latch recess 8b of the latch 8, which is in the closed position. In this state, when an attempt is made to move the latch 8 to the open position, the restricting surface 8c does not come into contact with the locking unit 9, allowing the latch 8 to be moved to the open position. In other words, when the locking unit 9 is in the unlocked position, the latch 8 is allowed to move to the open position, and the door 3 can be opened by operating the lever 16, resulting in an unlocked state.

The solenoid 10 is connected to the locking unit 9 via the link mechanism 11. The solenoid 10 is energized based on the unlock signal described above. When energized, the solenoid 10 moves the locking unit 9 to the unlocked position via the link mechanism 11. The solenoid 10 is deenergized based on the locking signal described below. When deenergized based on the locking signal, the solenoid 10 moves the locking unit 9 to the locked position via the link mechanism 11.

The switch 12 detects whether the latch 8 is in the open or closed state based on the position of the interlocking part 13, which will be described later. The switch 12 comprises a main body 12a and a movable part 12b. A contact (not shown) is provided inside the main body 12a. The movable part 12b is movable relative to the main body 12a. The contact of the switch 12 is turned on when the movable part 12b is pushed towards the main body 12a. The contact of the switch 12 is turned off when the movable part 12b protrudes from the main body. The safe 1 detects that the door 3 is in the closed state when the switch 12 is on, and detects that the door 3 is in the open state when the switch 12 is off.

In the switch 12, the amount D1 by which the movable part 12b protrudes from the main body 12a when the switch is switched from on to off is generally different from the amount D2 by which the movable part 12b protrudes from the main body 12a when the switch is switched from off to on. For example, as shown in Figure 6, D2 > D1.

The interlocking part 13 is a plate-shaped member attached to the door 3 so as to be rotatable around the rotation axis 18. Figure 8 is an enlarged view of part A shown in Figure 3, showing the state in which the latch is in the open position and the interlocking part is in the first position. Figure 9 is an enlarged view of part A shown in Figure 3, showing the state in which the latch is in the open position and the interlocking part is in the second position. Figure 10 is an enlarged view of part A shown in Figure 3, showing the state in which the latch is located at the boundary between the first and second movement ranges as it moves from the open position to the closed position.

As shown in Figures 8 to 10, the interlocking part 13 rotates around the rotation axis 18, allowing it to move between a position where it presses the movable part 12b of the switch 12 and a position where it does not press the movable part 12b. As shown in Figure 8, the position where the interlocking part 13 presses the movable part 12b of the switch 12 is the first position.

The interlocking part 13 has a long hole 13c that extends in an arc around the rotation axis 18. In other words, the long hole 13c is formed to extend along the movement direction of the interlocking part 13. A through hole 3e that protrudes from the back surface 3d of the door 3 passes through the long hole 13c. The movement range of the interlocking part 13 is limited by the through hole 3e abutting against the inner surface of the long hole 13c.

The interlocking portion 13 is provided with a first abutted portion 13a that abuts against the first abutment portion 8d of the bar 8, thereby moving the interlocking portion 13 in conjunction with the movement of the bar 8. Specifically, as shown in FIG. 10 , when the bar 8 reaches the boundary between the first movement range R1 and the second movement range R2 as it moves from the open position to the closed position, the first abutment portion 8d abuts against the first abutted portion 13a, and the through portion 3e abuts against the inside of the elongated hole 13c. Therefore, the interlocking portion 13 cannot rotate further downward from the state shown in FIG. 10 . In other words, the elongated hole 13c formed in the interlocking portion 13 and the through portion 3e form a stopping mechanism that stops the movement of the interlocking portion 13.

The position of the interlocking part 13 where rotational movement is restricted is the position where the interlocking part 13 does not press the movable part 12b of the switch 12, which is the second position. Thereafter, while the latch 8 moves through the second movement range R2, the first contact part 8d of the latch 8 moves away from the first contacted part 13a of the interlocking part 13, and the interlocking part 13 remains stationary and does not move.

Furthermore, while the latch 8 is moving through the second range of movement R2 from the open position to the closed position, the first abutment portion 8d of the latch 8 is separated from the first abutted portion 13a of the interlocking portion 13, so the interlocking portion 13 remains stationary and does not move. While the latch 8 is moving through the first range of movement R1, the first abutment portion 8d of the latch 8 abuts the first abutted portion 13a of the interlocking portion 13, causing the interlocking portion 13 to rotate upward and push in the movable portion 12b of the switch 12.

The interlocking portion 13 is provided with a second contacted portion 13b that restricts movement of the interlocking portion 13 by contacting a second holding protrusion 14d formed on the holding portion 14, which will be described later. As shown in Figures 6 and 7, the second contacted portion 13b is formed by forming a recess that recesses in the negative direction along the X axis at the end on the positive side along the X axis when the interlocking portion 13 is in the first position where it presses the movable portion 12b of the switch 12. In this embodiment, the second contacted portion 13b is formed by cutting out a corner of the interlocking portion 13, which is a plate-shaped member.

Figure 11 is a front view of the holding portion in this embodiment. Figure 12 is a side view of the holding portion in this embodiment. The holding portion 14 is a plate-shaped member attached to the door 3 so that it can move in the direction along the X-axis. The holding portion 14 has an elongated hole 14a that extends in the direction along the X-axis. A through-hole 3f that protrudes from the back surface 3d of the door 3 passes through the elongated hole 14a. The through-hole 3f passes through the elongated hole 14a, allowing the holding portion 14 to move in the direction along the X-axis. In the following description, the position where the holding portion 14 is moved in the negative direction along the X-axis is referred to as the restricted position, and the position where the holding portion 14 is moved in the positive direction along the X-axis is referred to as the non-restricted position.

The holding portion 14 is formed with a first holding protrusion 14c that protrudes forward. As shown in FIG. 7, when the holding portion 14 is in the restricted position, the first holding protrusion 14c abuts against the second abutment portion 13b of the interlocking portion 13, restricting movement of the interlocking portion 13. Also, as shown in FIG. 8, when the holding portion 14 is in the non-restricted position, the first holding protrusion 14c does not abut against the second abutment portion 8e of the interlocking portion 13, allowing movement of the interlocking portion 13.

The biasing portion 15 biases the holding portion 14 in the negative direction along the X-axis. For example, the biasing portion 15 is a tension spring.

The retaining portion 14 is formed with a second retaining protrusion 14d that protrudes rearward. The second retaining protrusion 14d is arranged to enter the movement path of the second abutment portion 8e of the latch 8. The second retaining protrusion 14d is located on the positive side of the X-axis relative to the second abutment portion 8e. When the latch 8 is in the closed position, the second abutment portion 8e and the second retaining protrusion 14d are separated.

As shown in Figures 7 to 9, when the latch 8 moves a certain distance from the closed position toward the open position and the second abutment portion 8e abuts the second retaining protrusion 14d, the retaining portion 14 also moves from the restricting position to the non-restricting position as the latch 8 moves. When the retaining portion 14 moves to the non-restricting position, the first retaining protrusion 14c also moves to a position where it does not abut the second abutted portion 13b. This allows the interlocking portion 13 to move.

(Door operation)
Next, we will explain the operation from unlocking the safe 1 to opening the door 3. First, the unlocking operation is performed using the operation unit 4, and when an unlock signal is sent, the solenoid 10 is excited. When the solenoid 10 is excited, the locking unit 9 is pulled up and moved to the unlocked position. This allows the latch 8 to move to the open position.

Next, the lever 16 is operated to move the latch 8 toward the open position. As shown in Figure 8, as the latch 8 moves toward the open position, the second abutment portion 8e of the latch 8 abuts the second retaining protrusion 14d of the retaining portion 14. As the latch 8 moves further, the retaining portion 14 also moves, and the first retaining protrusion 14c of the retaining portion 14 moves to a position where it does not abut the second abutted portion 13b. This allows the interlocking portion 13 to move.

When the latch 8 moves to the open position, the first abutment 8d also moves, causing the interlocking part 13 to rotate and move downward. When the interlocking part 13 rotates and moves downward, the movable part of the switch 12 protrudes, and when the protrusion amount reaches D1, the contact of the switch 12 turns off. When the contact of the switch 12 turns off, the door 3 is detected as being open. When the door 3 is detected as being open, the solenoid 10 is not demagnetized, and the locking part 9 does not move downward.

When the latch 8 moves to the open position, the protrusion 8a of the latch 8 moves outward from the recess 2d of the housing 2, allowing the free end of the door 3 to move and open.

Next, we will explain the operation from when the door 3 is closed until the safe 1 is locked. First, with the door 3 closed, the lever 16 is operated to move the latch 8 toward the closed position. The latch 8 first moves through the second movement range R2.

While the bar 8 is moving through the second range of movement R2, the first contact portion 8d of the bar 8 does not contact the first contacted portion 13a of the interlocking portion 13. Therefore, while the bar 8 is moving through the second range of movement R2, the interlocking portion 13 does not move.

When the latch 8 moves beyond the second range of movement R2 and into the first range of movement R1, the first contact portion 8d comes into contact with the first contacted portion 13a, causing the interlocking portion 13 to rotate and move upward. As the interlocking portion 13 rotates and moves upward, the interlocking portion 13 pushes in the movable portion 12b of the switch 12. When the movable portion 12b is pushed in until it protrudes to the amount D2, the contact is turned on.

When the contacts of the switch 12 are turned on, it is detected that the latch 8 is in the closed state. When the closed state is detected and the locking operation is performed using the operating unit 4, the solenoid 10 is demagnetized and the locking unit 9 is moved to the locked position. This results in a locked state in which the latch 8 cannot be moved to the open position even if the lever 16 is operated.

(effect)
As described above, the movable part 12b of the switch 12 has a protrusion amount D1 of the movable part 12b from the main body 12a when the switch is switched from on to off, and a protrusion amount D2 of the movable part 12b from the main body 12a when the switch is switched from off to on, D2 > D1. Therefore, the position of the interlocking part 13 when the open state is detected as the bar 8 moves from the closed position to the open position differs from the position of the interlocking part 13 when the closed state is detected as the bar 8 moves from the open position to the closed position. Specifically, the closed state is detected when the interlocking part 13 is closer to the second position. Therefore, if the interlocking part 13 starts moving and pushes in the movable part 12b immediately after the bar 8 starts moving from the closed position to the open position, the bar 8 may be erroneously detected as being in the closed state before it reaches a position where the locking part 9 can move to the locked position.

When the locking operation is performed using the operating unit 4 after the closed state has been erroneously detected, the solenoid 10 is demagnetized and the locking unit 9 moves toward the locked position. However, when the closed state has been erroneously detected, there is a possibility that a portion of the upper edge 8f of the latch 8 where the latch recess 8b is not formed remains along the path of the locking unit 9 moving toward the locked position. If a portion of the upper edge 8f where the latch recess 8b is not formed remains along the path of the locking unit 9 moving toward the locked position, the locking unit 9 will not be able to reach the locked position. Specifically, the locking unit 9 will be in contact with the upper edge 8f of the latch 8. In the following explanation, the state in which the locking unit 9 is in contact with the upper edge 8f of the latch 8 and has not yet reached the locked position will be referred to as an incompletely locked state.

If the lever 16 is operated when the safe is in an incompletely locked state, the latch 8 can be moved to the open position, but because the safe 1 is detected as being locked, it is detected that an unauthorized attempt to open the door 3 has been made, i.e., that the door has been forced open, and an alarm is sounded.

In contrast, in this embodiment, while the latch 8 is moving from the open position to the closed position within the second movement range R2, the first contact portion 8d does not contact the interlocking portion 13 until the latch 8 has moved a certain distance toward the closed position.

As a result, the latch 8 can be moved close enough to allow the locking unit 9 to move to the locked position, and then the interlocking unit 13 can be moved to push in the movable unit 12b of the switch 12. This prevents the latch 8 from being mistakenly detected as closed even when it is not in the closed position, resulting in an incompletely locked state, as was the case in the past. Furthermore, by preventing an incompletely locked state, it is possible to prevent an alarm from being issued when a forced opening is detected.

Furthermore, while the latch 8 is moving from the open position to the closed position within the first movement range R1, the first abutment portion 8d abuts against the interlocking portion 13, causing the interlocking portion 13 to move. The movement of the interlocking portion 13 presses the movable portion 12b of the switch 12, so it is possible to reliably detect that the latch 8 is in the closed position, i.e., that the door 3 is in the closed state.

Furthermore, when the latch 8 moves from the closed position to the open position and reaches the boundary between the second range of movement R2 and the first range of movement R1, the movement of the interlocking part 13 is stopped by the contact between the inside of the elongated hole 13c and the through-hole 3e. In this way, the range of movement of the interlocking part 13 can be set to an appropriate range by the elongated hole 13c and the through-hole 3e.

In addition, in this embodiment, the latch 8 does not directly push the movable portion 12b of the switch 12, but rather the interlocking portion 13 pushes the movable portion 12b. Furthermore, in the closed state, the first retaining protrusion 14c of the retaining portion 14, which is in the restricted position, abuts against the second abutted portion 13b of the interlocking portion 13, which is in a position where the movable portion 12b of the switch 12 is pushed in. This restricts the interlocking portion 13 from moving in a direction that does not push the movable portion 12b.

In the locked state, a gap may exist between the locking portion 9 and the restricting surface 8c of the latch 8. Therefore, the latch 8 may be able to move slightly toward the open position. In other words, the latch 8 has a play that allows it to move by the gap. In this embodiment, even if the latch 8 moves toward the open position due to the play, the amount of protrusion of the movable portion 12b of the switch 12 does not change unless the interlocking portion 13 moves. The movement of the interlocking portion 13 is restricted by the retaining portion 14. Therefore, even if the latch 8 moves toward the open position due to the play, the amount of protrusion of the movable portion 12b of the switch 12 does not change. If the amount of protrusion of the movable portion 12b of the switch 12 changes, there is a possibility that the open state will be falsely detected. However, in this embodiment, even if the latch 8 moves toward the open position due to the play, the movable portion 12b of the switch 12 does not move, so the open state will not be falsely detected due to the play of the latch 8.

In addition, because the retaining portion 14 is biased by the biasing portion 15 in the direction toward the restricted position, the retaining portion 14 is less likely to deviate from the restricted position. This ensures that the retaining portion 14 is stably positioned in the interlocking portion 13. This ensures that the first retaining protrusion 14c remains in contact with the second abutment portion 13b of the interlocking portion 13. This more reliably prevents the open state from being detected erroneously.

Figure 13 shows a modified version of the locking device in the embodiment. As shown in Figure 13, the interlocking portion 13 is configured to move parallel to the X-axis. The switch 12 is installed so that the pushing direction of the movable portion 12b is parallel to the X-axis. The retaining portion 14 is configured to move up and down by abutting against the second abutment portion 8e of the latch 8. Specifically, the second retaining protrusion 14d is shaped so that the upper end of the YZ plane is tilted toward the positive side of the X-axis. The retaining portion 14 is in the restricting position when positioned downward and in the non-restricting position when positioned upward. Note that in this modified version, the retaining portion 14 cannot move under its own weight, so a biasing portion 19 is also provided to bias it in the positive direction along the X-axis. However, because the retaining portion 14 can move under its own weight, the biasing portion 15 can be omitted in this modified version.

This configuration also prevents the incomplete locking state described above, and prevents the interlocking part 13 from moving when the latch 8 rattles, causing the door to be detected as open.

REFERENCE SIGNS LIST 1 Safe 2 Housing 2a Front surface 2b Opening 3 Door 3c Surface 3d Back surface 3e, 3f Penetration portion 7 Locking device 8 Bar 8a Convex portion 8b Bar concave portion 8c Restriction surface 8d First abutment portion 8e Second abutment portion 8f Upper edge 9 Locking portion 10 Solenoid 11 Link mechanism 12 Switch 12a Main body 12b Movable portion 13 Interlocking portion 13a First abutted portion 13b Second abutted portion 13c Elongated hole 14 Retaining portion 14a Elongated hole 14c First retaining convex portion 14d Second retaining convex portion R1 First moving range R2 Second moving range

Claims (6)

A locking device for locking a door that closes an opening,
a latch that is movable between an open position where the door can be opened and a closed position where the door is restricted from being opened;
a locking unit that is movable between a locked position that restricts the movement of the latch from the closed position to the open position and an unlocked position that allows the movement of the latch from the closed position to the open position;
an interlocking portion that moves from a first position to a second position in accordance with movement of the latch from the closed position to the open position;
a switch that detects whether the door is closed or open based on the position of the interlocking part,
The movement range of the latch is divided into a first movement range from the closed position toward the open position and a second movement range that is closer to the open position than the first movement range,
a locking device characterized in that the latch is provided with a first abutment portion that does not abut the interlocking portion when the latch is moving through the second range of movement, and that abuts the interlocking portion when the latch is moving through the first range of movement, thereby moving the interlocking portion from the second position to the first position. a stop mechanism that stops the movement of the interlocking part from the first position toward the second position when the latch reaches a boundary between the first movement range and the second movement range,
2. The locking device according to claim 1, wherein the position at which the interlocking portion is stopped by the stopping mechanism is the second position. the stop mechanism has an elongated hole formed in the interlocking portion so as to extend along the movement direction of the interlocking portion, and a through-portion that passes through the elongated hole,
The locking device according to claim 2, wherein the movement of the interlocking part is stopped by the through part coming into contact with the inside of the elongated hole. a holding portion that is movable between a restricting position where the holding portion abuts against the interlocking portion at the first position to restrict movement of the interlocking portion, and a non-restricting position where the holding portion separates from the interlocking portion at the first position to allow movement of the interlocking portion;
2. The locking device according to claim 1, wherein the retaining portion in the restricting position moves to the non-restricting position after the latch has moved a certain distance from the closed position toward the open position. a biasing portion that biases the holding portion in a direction from the non-restricted position toward the restricted position,
5. The locking device according to claim 4, wherein the latch is provided with a second abutment portion that abuts against the retaining portion to move the latch to the non-restricted position after the latch has moved a certain distance from the closed position toward the open position. A box body having an opening on one side;
a door that closes the opening;
A safe comprising: a locking device according to any one of claims 1 to 5, which is provided on the door.