Patent Description:
PTL <NUM> discloses a handle attached to a door of a refrigeration device including a storage compartment. When operated in the state where the door is closed, the handle restricts and allows an operation of changing the door from the closed state to the open state. The handle is provided with a manual locking device that restricts (i.e., locks) and allows (i.e., unlocks) the operations of the handle.

Document <CIT> discloses a locking device comprising a pressure member and a sliding lever member between a restricting position and a position allowing operation of the handle.

Incidentally, the handle may include both the manual locking device and the electronic locking device. In the case where both the manual locking device and the electronic locking device are provided, the user may not know which locking device, manual or electronic, restricts the operation of the handle. This can make it time-consuming for the user to operate the handle.

For solving such conventional problems, an object of the present invention is to provide a locking device that can easily lock and unlock in the manual and electric manner. Solution to Problem.

To achieve the above-mentioned object, a locking device of the present invention includes a lever member configured to sway around a first rotation axis and including a restriction part configured to restrict an operation of a handle, a hole, and an attaching portion where a moving member configured to move in accordance with an operation of an electromagnetic actuator is attached; and a pressure member disposed in the hole and configured to make a first back-and-forth movement in the hole in accordance with an unlocking operation of a key. The pressure member moves the restriction part from a position for restricting the operation of the handle to a position for allowing the operation of the handle by swaying the lever member around the first rotation axis by pressing a first portion in a forward movement of the first back-and-forth movement, and moves away from the first portion without swaying the lever member in a backward movement of the first back-and-forth movement, the first portion being a portion of an inner peripheral surface of the hole.

In addition, to achieve the above-mentioned object, a refrigeration device of the present invention includes the locking device of the present invention.

With the locking device and the refrigeration device according to the present invention, it is possible to easily lock and unlock in the manual and electric manner.

A locking device and a refrigeration device of an embodiment of the present invention are described below with reference to the drawings. Note that for convenience of the description below, the upper side and lower side in <FIG> are the upper side and lower side of refrigeration device <NUM> respectively; the upper left side and lower right side are rear side and front side of refrigeration device <NUM>, respectively; and the left side and right side are the left side of and right side of refrigeration device <NUM>, respectively.

Locking device <NUM> is attached to refrigeration device <NUM> such as an ultra-low-temperature freezer in which the temperature inside a storage compartment (not illustrated in the drawing) is -<NUM> or below, for example.

As illustrated in <FIG>, refrigeration device <NUM> includes box <NUM> including inside a storage compartment (not illustrated in the drawing) that opens to the front side, door <NUM> that opens and closes the opening of the storage compartment, and handle <NUM> attached to door <NUM>. In addition, box <NUM> includes a refrigeration circuit (not illustrated in the drawing) that cools the inside of the storage compartment.

Door <NUM> is connected to box <NUM> through a hinge (not illustrated in the drawing) disposed on the right side. Door <NUM> is a right-opening door. In addition, door <NUM> is provided with operation panel 3a for the user to operate refrigeration device <NUM>.

As illustrated in <FIG> and <FIG>, handle <NUM> is attached to the left surface of door <NUM>. Handle <NUM> is a member for easily opening and closing door <NUM>, and is operated by the user when opening or closing door <NUM>. When operated in the state where door <NUM> is in a closed state, handle <NUM> restricts and allows the operation of changing the state of door <NUM> from the closed state to the open state. As illustrated in <FIG>, handle <NUM> includes box base <NUM>, door base <NUM>, casing <NUM>, and holding part <NUM>. Box base <NUM>, door base <NUM> and casing <NUM> are provided separately from each other.

Box base <NUM> is fixed to a position near door <NUM> in the left surface of box <NUM>. As illustrated in <FIG> and <FIG>, box base <NUM> includes box fixing part <NUM>, engage pin <NUM>, and protrusion <NUM>. Note that protrusion <NUM> illustrated in <FIG> is illustrated with a broken line.

Box fixing part <NUM> is formed in a plate shape, and fixed to box <NUM>. Engage pin <NUM> is formed in a columnar shape extending leftward along the left-right direction from the left plate surface of box fixing part <NUM>. Engage pin <NUM> engages with casing <NUM> (details are described later) when door <NUM> is in a closed state. Protrusion <NUM> protrudes frontward from the front surface of box fixing part <NUM>. Protrusion <NUM> presses restriction plate <NUM> described later when door <NUM> is in a closed state (details are described later).

Door base <NUM> is formed in a plate shape, and fixed to the left surface of door <NUM>. Door base <NUM> is attached to door <NUM> so as to be aligned with box base <NUM> in the front-rear direction when door <NUM> is in a closed state. Stopper <NUM> protruding leftward from the left plate surface is formed in door base <NUM> (<FIG> and <FIG>). Details of stopper <NUM> are described later.

In door base <NUM>, casing <NUM> is attached so as to be rotatable clockwise and counterclockwise in <FIG>. In addition, restriction plate <NUM> is disposed in door base <NUM> (<FIG> and <FIG>). Details of restriction plate <NUM> are described later.

Casing <NUM> is formed in a hollow columnar shape that is open on the right side. As illustrated in <FIG> and <FIG>, base shaft member <NUM> is attached to casing <NUM>, and base shaft member <NUM> is extended through the left side wall of casing <NUM> and attached to door base <NUM>. Casing <NUM> rotates around second rotation axis 31a with respect to door base <NUM>. Second rotation axis 31a is the central axis of base shaft member <NUM>.

Casing <NUM> and holding part <NUM> are formed integrally with each other. Holding part <NUM> is formed in a rod shape extending from the outer peripheral surface of casing <NUM>. Holding part <NUM> is grabbed when the user operates handle <NUM>. Casing <NUM> is attached to door <NUM> such that holding part <NUM> is located at close position Ph1 along the up-down direction when door <NUM> is in a closed state (<FIG>). In addition, engaged portion <NUM> and protrusion <NUM> are formed in casing <NUM>.

Engaged portion <NUM> is formed in a groove shape with the first end opening to the outer peripheral surface of casing <NUM> at the inner surface of the left side wall of casing <NUM>. Engaged portion <NUM> is formed to extend approximately along the up-down direction when holding part <NUM> is located at close position Ph1 (<FIG>). In addition, when door <NUM> is in a closed state and holding part <NUM> is located at close position Ph1, engage pin <NUM> engages with the second end portion of engaged portion <NUM> (<FIG>). In this manner, when the user tries to open door <NUM> with holding part <NUM> still located at close position Ph1, door <NUM> is restricted from opening by engage pin <NUM> in contact with the side surface of engaged portion <NUM>.

When opening door <NUM>, the user grabs holding part <NUM> to operate holding part <NUM> (i.e., pull it to the near side) such that casing <NUM> rotates clockwise in <FIG> (counterclockwise in <FIG>). In this manner, holding part <NUM> moves from close position Ph1 (<FIG>) to open position Ph2 (<FIG>). When casing <NUM> rotates, engaged portion <NUM> rotates and as a result the side surface of engaged portion <NUM> presses engage pin <NUM>.

When holding part <NUM> is located at open position Ph2, pressed engage pin <NUM> relatively moves to the vicinity of the opening of engaged portion <NUM> with respect to casing <NUM>, and the first end of engaged portion <NUM> opens to the rear side (<FIG>). In this manner, when the user opens door <NUM>, engage pin <NUM> is not brought into contact with the side surface of engaged portion <NUM>, and thus door <NUM> is allowed to open. Note that when holding part <NUM> is located at open position Ph2, door <NUM> opens by the distance of the movement of engage pin <NUM> in the front-rear direction.

Protrusion <NUM> is formed to protrude rightward from the inner surface of the left side wall of casing <NUM> along the left-right direction. Details of protrusion <NUM> are described later.

In addition, locking device <NUM> is housed in casing <NUM>. Locking device <NUM> restricts and allows the operation of handle <NUM>. The operation of handle <NUM> restricted and allowed by locking device <NUM> is the operation in which the user moves holding part <NUM> from close position Ph1 to open position Ph2.

When locking device <NUM> is locked, the operation of handle <NUM> is restricted. That is, when locking device <NUM> is locked, the user cannot move holding part <NUM> from close position Ph1 to open position Ph2. On the other hand, when locking device <NUM> is unlocked, the operation of handle <NUM> is allowed. That is, when locking device <NUM> is unlocked, the user can move holding part <NUM> from close position Ph1 to open position Ph2.

Locking device <NUM> includes electromagnetic actuator <NUM>, control part <NUM> (<FIG>), manual rotation member <NUM>, lever member <NUM>, coupling member <NUM> (<FIG>), and holding member <NUM>. In addition, the above-described stopper <NUM> and protrusion <NUM> also make up locking device <NUM>. Coupling member <NUM> is an example of "moving member".

Electromagnetic actuator <NUM> is composed of a self-retaining solenoid. As illustrated in <FIG>, electromagnetic actuator <NUM> is disposed in recess <NUM> formed in the inner surface of the left side wall of casing <NUM>. Electromagnetic actuator <NUM> includes frame 51a, movable iron core 51b, first spring 51c, permanent magnet 51d, and magnetic coil 51e.

Frame 51a is formed in a cuboid shape, and houses permanent magnet 51d and magnetic coil 51e. Movable iron core 51b is formed in a columnar shape, and held so as to be movable back and forth along the axial direction with respect to frame 51a. The first end portion (in <FIG>, the upper end portion) of movable iron core 51b is housed in frame 51a. The second end portion (in <FIG>, the lower end portion) of movable iron core 51b is exposed to the outside. Movable iron core 51b moves back and forth along the axial direction (in <FIG>, the approximately up-down direction).

First spring 51c is a coil spring. First spring 51c biases movable iron core 51b in the advancing direction from frame 51a (in <FIG>, the downward direction). Permanent magnet 51d holds movable iron core 51b with a magnetic force.

Magnetic coil 51e is a coil that generates a magnetic flux when energized. Magnetic coil 51e is composed of a conductive wire wound around the first end portion of movable iron core 51b in frame 51a. The both end portions of the conductive wire making up magnetic coil 51e is connected to electric wire C through terminal T. Magnetic coil 51e receives power from terminal T through electric wire C. Terminal T is an example of "power receiving part".

As illustrated in <FIG> and <FIG>, terminal T is disposed at a center portion in the front surface of magnetic coil 51e. In addition, terminal T is disposed near the second rotation axis 31a than the second end portion of movable iron core 51b (<FIG>). Attaching portion 54b of lever member <NUM> described later is attached to the second end portion of movable iron core 51b through coupling member <NUM>. Specifically, magnetic coil 51e is disposed near second rotation axis 31a than attaching portion 54b. More specifically, magnetic coil 51e is disposed near second rotation axis 31a.

Now, an operation of electromagnetic actuator <NUM> is described. In electromagnetic actuator <NUM> illustrated in <FIG>, magnetic coil 51e is not energized, movable iron core 51b is located at advanced position Pp1 advanced from frame 51a, and the position of movable iron core 51b is kept at advanced position Pp1 with the magnetic force of permanent magnet 51d.

In electromagnetic actuator <NUM> illustrated in <FIG>, when magnetic coil 51e is energized in the predetermined direction, magnetic coil 51e is excited and as a result the attraction force for attracting movable iron core 51b is generated. In this manner, movable iron core 51b with the attraction force retracts against the magnetic force of permanent magnet 51d and the biasing force of first spring 51c, and is set at retraction position Pp2 illustrated in <FIG>. When the energization of magnetic coil 51e is stopped, movable iron core 51b is held at retraction position Pp2 with the magnetic force of permanent magnet 51d.

On the other hand, in electromagnetic actuator <NUM> illustrated in <FIG>, when magnetic coil 51e is energized in a direction opposite to a predetermined direction, a magnetic flux in the direction opposite to the direction in which magnetic coil 51e is energized in the predetermined direction is generated. In this manner, the magnetic force of permanent magnet 51d is canceled, and as a result movable iron core 51b advances against the magnetic force of permanent magnet 51d with the biasing force of first spring 51c so as to be located at advanced position Pp1 illustrated in <FIG>. When the energization of magnetic coil 51e is stopped, movable iron core 51b is held at advanced position Pp1 by the magnetic force of permanent magnet 51d. In the following description, regarding the energization of magnetic coil 51e, the predetermined direction is referred to as advancing direction and the direction opposite to the predetermined direction as retraction direction.

Control part <NUM> is housed in door <NUM> (<FIG>). Control part <NUM> is electrically connected to magnetic coil 51e of electromagnetic actuator <NUM> through electric wire C (<FIG>) so as to control electromagnetic actuator <NUM>. When receiving a locking signal for restricting the operation of handle <NUM>, control part <NUM> energizes magnetic coil 51e in the advancing direction. When receiving an unlocking signal for allowing the operation of handle <NUM>, control part <NUM> energizes magnetic coil 51e in the retraction direction. The signal received by control part <NUM> is output from a control device (not illustrated in the drawing) that centrally controls refrigeration device <NUM>.

The control device outputs the locking signal to control part <NUM> when a lock switch (not illustrated in the drawing) displayed on operation panel 3a that restricts the operation of handle <NUM> is pressed by the user. On the other hand, when an unlocking switch (not illustrated in the drawing) that allows the operation of handle <NUM> disposed in operation panel 3a is pressed by the user, the control device outputs the unlocking signal to control part <NUM>. Note that control part <NUM> may be configured integrally with, or separately from, the control device.

As illustrated in <FIG>, manual rotation member <NUM> is formed in a columnar shape extending along the left-right direction. Manual rotation member <NUM> is disposed in casing <NUM> such that key K can be inserted to key hole H (<FIG>) provided in the left surface from the outside of handle <NUM>. When key K is inserted to key hole H and key K is manually turned, manual rotation member <NUM> rotates around the central axis of manual rotation member <NUM>. In addition, manual rotation member <NUM> is provided with pressure member 53a.

Pressure member 53a is provided in a columnar shape extending rightward along the left-right direction from the right surface of manual rotation member <NUM>. Pressure member 53a rotates integrally with manual rotation member <NUM>. Pressure member 53a is located at reference position Po1 illustrated in <FIG> and <FIG> in the state where key K is not inserted in key hole H. Manual rotation member <NUM> is configured such that key K can be inserted to or removed from key hole H when pressure member 53a is located at reference position Po1.

When pressure member 53a is located at reference position Po1 and key K is inserted to key hole H and rotated clockwise in <FIG>, pressure member 53a is rotated clockwise around the central axis of manual rotation member <NUM> and set at drawing position Po2 (<FIG>). The operation of key K in which pressure member 53a moves from reference position Po1 to drawing position Po2 is referred to as unlocking operation.

Further, when key K is rotated counterclockwise in <FIG>, pressure member 53a rotates clockwise from drawing position Po2 around the central axis of manual rotation member <NUM> and returns to reference position Po1. In this manner, pressure member 53a makes a first back-and-forth movement of moving from reference position Po1 to drawing position Po2 and returning from drawing position Po2 to reference position Po1 in accordance with the unlocking operation of key K.

In addition, when key K is inserted to key hole H and rotated counterclockwise in <FIG> in the state where pressure member 53a is located at reference position Po1, pressure member 53a is rotated counterclockwise around the central axis of manual rotation member <NUM> and set at push position Po3 (<FIG>). The operation of key K in which pressure member 53a moves from reference position Po1 to push position Po3 is referred to as locking operation.

Further, when key K is rotated clockwise in <FIG>, pressure member 53a rotates clockwise from push position Po3 around the central axis of manual rotation member <NUM> and returns to reference position Po1. In this manner, pressure member 53a makes a second back-and-forth movement of moving from reference position Po1 to push position Po3 and returning from push position Po3 to reference position Po1 in accordance with the locking operation of key K.

Holding member <NUM> rotatably holds lever member <NUM>. As illustrated in <FIG>, holding member <NUM> includes holding plate 56a and holding shaft member 56b, and holding plate 56a is formed in a plate shape and fixed to casing <NUM>. Holding shaft member 56b is formed in a columnar shape, and disposed to extend leftward along the left-right direction from the left plate surface of holding plate 56a.

Lever member <NUM> is formed in an L-shape in side view, and is disposed between the left side wall of casing <NUM> and holding plate 56a (<FIG>). In addition, lever member <NUM> is fit with holding shaft member 56b so as to be rotatable (swayable) with respect to holding shaft member 56b. First rotation axis 54a serving as the rotational center of lever member <NUM> is coaxial with the central axis of holding shaft member 56b.

In addition, as illustrated in <FIG>, lever member <NUM> and electromagnetic actuator <NUM> are disposed along plane F orthogonal to second rotation axis 31a (see <FIG>) with plane F orthogonal to second rotation axis 31a sandwiched therebetween. That is, assuming that a plurality of virtual layers stacked in the direction along second rotation axis 31a is used, lever member <NUM> and electromagnetic actuator <NUM> are disposed in layers different from each other. Thus, the arrangement of lever member <NUM>, electromagnetic actuator <NUM> and other members in casing <NUM> can be optimized and casing <NUM> can be downsized. Note that more specifically, lever member <NUM> is disposed on the right side than electromagnetic actuator <NUM> (<FIG> and <FIG>).

As illustrated in <FIG>, lever member <NUM> includes attaching portion 54b, hole 54c, and restriction part 54d.

Attaching portion 54b is formed in a rod shape at an end portion on the rear side than first rotation axis 54a in lever member <NUM>. The second end portion of movable iron core 51b that moves in accordance with the operation of electromagnetic actuator <NUM> is attached to attaching portion 54b. More specifically, attaching portion 54b is attached to movable iron core 51b through coupling member <NUM> (<FIG>). In accordance with the back-and-forth movement of movable iron core 51b, attaching portion 54b and in turn lever member <NUM> rotate around first rotation axis 54a (details are described later).

Restriction part 54d is provided in lever member <NUM> to protrude upward at an end portion on the front side than first rotation axis 54a. That is, restriction part 54d and attaching portion 54b are disposed on the opposite sides with first rotation axis 54a therebetween. In this manner, by adjusting the distance between first rotation axis 54a and attaching portion 54b and the distance between first rotation axis 54a and restriction part 54d, the movement amount of movable iron core 51b and in turn the movement amount of restriction part 54d in accordance with the movement amount of attaching portion 54b can be appropriately set.

When lever member <NUM> rotates around first rotation axis 54a, restriction part 54d moves between lock position Pk1 and unlock position Pk2.

As illustrated in <FIG>, lock position Pk1 is a position where restriction part 54d is fit to region (hereinafter referred to as restriction region) R formed between protrusion <NUM> and stopper <NUM> in the rotational direction around second rotation axis 31a when holding part <NUM> is located at close position Ph1. Restriction region R is the region indicated with the broken line in <FIG>.

Stopper <NUM> is located on the lower side of base shaft member <NUM>, and is formed integrally with door base <NUM> fixed to door <NUM> as described above. Thus, stopper <NUM> does not move from the position illustrated in <FIG> even when holding part <NUM> is operated and casing <NUM> is rotated.

On the other hand, protrusion <NUM> is located on the front side of base shaft member <NUM> and formed integrally with casing <NUM> as described above. Thus, protrusion <NUM> rotates integrally with casing <NUM> when holding part <NUM> is operated. When holding part <NUM> is located at close position Ph1 illustrated in <FIG>, protrusion <NUM> is located at a position separated from stopper <NUM> in the rotational direction around second rotation axis 31a with restriction region R therebetween. When holding part <NUM> is rotated from close position Ph1 and set at open position Ph2, protrusion <NUM> is rotated clockwise around second rotation axis 31a of <FIG> and set at a position where it makes contact with stopper <NUM> and no restriction region R is formed (<FIG>).

When restriction part 54d is located at lock position Pk1 where it is fit to restriction region R (<FIG>), restriction part 54d is sandwiched between protrusion <NUM> and stopper <NUM> in the rotational direction around second rotation axis 31a and brought into contact with both protrusion <NUM> and stopper <NUM>. In this manner, the rotation of protrusion <NUM> around second rotation axis 31a and in turn the rotation of holding part <NUM> from close position Ph1 to open position Ph2 are restricted. That is, when restriction part 54d is located at lock position Pk1, locking device <NUM> is in a locked state.

As illustrated in <FIG>, unlock position Pk2 is a position where restriction part 54d is out of restriction region R that is formed when handle <NUM> is located at close position Ph1. When restriction part 54d is located at unlock position Pk2, restriction part 54d does not inhibit the rotation of protrusion <NUM> around second rotation axis 31a. In this manner, the rotation of protrusion <NUM> around second rotation axis 31a and in turn the rotation of holding part <NUM> from close position Ph1 to open position Ph2 are allowed. That is, when restriction part 54d is located at unlock position Pk2, locking device <NUM> is in an unlocked state.

Hole 54c is formed in an approximately rectangular shape. Hole 54c is a hole extending through in the left-right direction on the front side than first rotation axis 54a in lever member <NUM>. That is, hole 54c and attaching portion 54b are disposed on the opposite sides with first rotation axis 54a therebetween. In this manner, by adjusting the distance between first rotation axis 54a and attaching portion 54b and the distance between first rotation axis 54a and hole 54c, it is possible to appropriately set the movement amount of hole 54c in accordance with the movement amount of movable iron core 51b and in turn the movement amount of attaching portion 54b.

Pressure member 53a is disposed in hole 54c. Pressure member 53a makes the first back-and-forth movement and the second back-and-forth movement in hole 54c as described above.

As illustrated in <FIG>, when restriction part 54d is located at lock position Pk1, pressure member 53a presses first portion S1, which is a part of the inner peripheral surface of hole 54c, through the movement of pressure member 53a from reference position Po1 (<FIG>) to drawing position Po2 (<FIG>) (i.e., the forward movement of the first back-and-forth movement). First portion S1 is a lower portion in the inner peripheral surface of hole 54c.

On the other hand, as illustrated in <FIG>, when restriction part 54d is located at unlock position Pk2, pressure member 53a presses second portion S2, which is a part of the inner peripheral surface of hole 54c, through the movement of pressure member 53a from reference position Po1 (<FIG>) to push position Po3 (<FIG>) (i.e., the forward movement of the second back-and-forth movement). Second portion S2 is an upper portion in the inner peripheral surface of hole 54c.

In addition, hole 54c is formed such that the distance between first portion S1 and second portion S2 is greater than the outer diameter of pressure member 53a. More specifically, as illustrated in <FIG>, hole 54c is formed such that pressure member 53a does not press first portion S1 and second portion S2 even when pressure member 53a makes the second back-and-forth movement between reference position Po1 and push position Po3 in the case where restriction part 54d is located at lock position Pk1.

Further, as illustrated in <FIG>, hole 54c is formed such that pressure member 53a does not press first portion S1 and second portion S2 even when pressure member 53a makes the first back-and-forth movement between reference position Po1 and drawing position Po2 in the case where restriction part 54d is located at unlock position Pk2.

In addition, hole 54c is formed such that pressure member 53a does not press first portion S1 and second portion S2 even when lever member <NUM> is rotated through the operation of electromagnetic actuator <NUM> as described later in the case where pressure member 53a is located at reference position Po1 (<FIG> and <FIG>).

Coupling member <NUM> is a member provided separately from electromagnetic actuator <NUM>. Coupling member <NUM> couples attaching portion 54b and movable iron core 51b. As illustrated in <FIG>, coupling member <NUM> is formed in a plate shape extending along the approximately left-right direction. Coupling member <NUM> is rotatably fit to coupling shaft member <NUM> disposed at casing <NUM> so as to extend along the approximately front-rear direction at one end side (left end side). Groove part 55a and long hole 55b are formed in coupling member <NUM>.

Groove part 55a is formed in a center portion of coupling member <NUM>. Movement shaft member <NUM> extending through the second end portion of movable iron core 51b along approximately front-rear direction is engaged with groove part 55a. Movement shaft member <NUM> moves back and forth along the axial direction of movable iron core 51b in accordance with the back-and-forth movement of movable iron core 51b. Groove part 55a that engages with movable iron core 51b and in turn coupling member <NUM> rotate around coupling shaft member <NUM> in accordance with the movement of movement shaft member <NUM>.

Long hole 55b is formed on the other end side (right end side) of coupling member <NUM>. Attaching portion 54b of lever member <NUM> is engaged with long hole 55b. When coupling member <NUM> rotates around coupling shaft member <NUM> in accordance with the back-and-forth movement of movable iron core 51b as described above, long hole 55b rotates around coupling shaft member <NUM>. In this manner, when attaching portion 54b engaged with long hole 55b moves, lever member <NUM> rotates around first rotation axis 54a.

With the above-described configuration of coupling member <NUM>, coupling member <NUM> has a fulcrum on one end side where coupling shaft member <NUM> makes contact, and an operation point on the other end side where attaching portion 54b makes contact. In addition, coupling member <NUM> includes a force point where the force of electromagnetic actuator <NUM> is applied through movement shaft member <NUM> between the fulcrum and the operation point where attaching portion 54b makes contact.

Since coupling member <NUM> is engaged with movement shaft member <NUM> between coupling shaft member <NUM> and long hole 55b where attaching portion 54b is attached, the movement amount of long hole 55b is greater than the movement amount of movable iron core 51b. Thus, it is possible to make the movement amount of attaching portion 54b greater than the movement amount of movable iron core 51b. Thus, the movement amount of movable iron core 51b can be suppressed and electromagnetic actuator <NUM> can be downsized.

In addition, as illustrated in <FIG>, locking device <NUM> further includes third spring <NUM>. Third spring <NUM> is a torsion spring. Third spring <NUM> is attached by using lever hole 54e and plate hole 56a1 between lever member <NUM> and holding plate 56a. Third spring <NUM> is an example of "elastic member".

As illustrated in <FIG> and <FIG>, first end portion 59a of third spring <NUM> is attached to plate hole 56a1 formed in holding plate 56a. Holding plate 56a is fixed to casing <NUM>, and therefore the position of plate hole 56a1 and in turn the position of first end portion 59a of third spring <NUM> are fixed with respect to casing <NUM>.

On the other hand, second end portion 59b of third spring <NUM> is attached to lever hole 54e of lever member <NUM>. Lever member <NUM> rotates around first rotation axis 54a with respect to casing <NUM>, and therefore lever hole 54e and in turn second end portion 59b of third spring <NUM> rotate around first rotation axis 54a with respect to casing <NUM>. Thus, third spring <NUM> is displaced in accordance with rotation of second end portion 59b. In addition, third spring <NUM> elastically deforms in accordance with the rotation of second end portion 59b.

Lever hole 54e is formed in lever member <NUM> so as to pass between first rotation axis 54a and plate hole 56a1 of holding plate 56a when lever member <NUM> rotates around first rotation axis 54a. More specifically, lever hole 54e moves around first rotation axis 54a so as to be located at lock position Pa1, unlock position Pa2, and intermediate position Pa3 along trajectory L of the central axis of lever hole 54e indicated with the broken line.

Lock position Pa1 of lever hole 54e is the position of lever hole 54e when restriction part 54d is located at lock position Pk1. Unlock position Pa2 of lever hole 54e is the position of lever hole 54e when restriction part 54d is located at unlock position Pk2.

Intermediate position Pa3 of lever hole 54e is the position of lever hole 54e between lock position Pa1 and unlock position Pa2. When lever hole 54e is located at intermediate position Pa3, the central axis of lever hole 54e is located at the center of trajectory L. In addition, lever hole 54e and plate hole 56a1 are disposed such that lever hole 54e is closest to plate hole 56a1 when lever hole 54e is located at intermediate position Pa3.

Here, as illustrated in <FIG>, the distance of lever hole 54e to plate hole 56a1 is smaller when it is located at intermediate position Pa3 than at lock position Pa1. In addition, the deformation amount of third spring <NUM> is set such that it is larger when lever hole 54e is located at intermediate position Pa3 than at lock position Pa1.

Further, lever member <NUM> rotates around first rotation axis 54a clockwise in <FIG> when lever hole 54e is located at located at lock position Pa1 than at intermediate position Pa3. Thus, when lever hole 54e is located at lock position Pa1, third spring <NUM> generates the elastic force in the direction in which plate hole 56a1 and lever hole 54e move away, and thus biases lever member <NUM> around first rotation axis 54a clockwise in <FIG>.

Thus, when restriction part 54d is located at lock position Pk1, third spring <NUM> biases lever member <NUM> such that restriction part 54d continues to be located at lock position Pk1. In this manner, removal of restriction part 54d from lock position Pk1 can be suppressed.

In addition, as illustrated in <FIG>, the distance of lever hole 54e to plate hole 56a1 is smaller when it is located at intermediate position Pa3 than at unlock position Pa2. In addition, the deformation amount of third spring <NUM> is set such that it is larger when lever hole 54e is located at intermediate position Pa3 than at unlock position Pa2.

Further, lever member <NUM> rotates around first rotation axis 54a counterclockwise in <FIG> when lever hole 54e is located at unlock position Pa2 than at intermediate position Pa3. Therefore, when lever hole 54e is located at unlock position Pa2, third spring <NUM> generates an elastic force in the direction in which plate hole 56a1 and lever hole 54e move away, and thus biases lever member <NUM> around first rotation axis 54a counterclockwise in <FIG>.

Thus, when restriction part 54d is located at unlock position Pk2, third spring <NUM> biases lever member <NUM> such that restriction part 54d continues to be located at unlock position Pk2. In this manner, removal of restriction part 54d from unlock position Pk2 can be suppressed.

As illustrated in <FIG> and <FIG>, restriction plate <NUM> is formed in a triangular plate shape in side view. In addition, restriction plate <NUM> is formed to protrude at the lower front end portion and the lower rear end portion. Restriction plate <NUM> is attached to door base <NUM> so as to be located on the upper side of base shaft member <NUM> in casing <NUM>. Restriction plate <NUM> is attached to door base <NUM> through restriction shaft member <NUM>.

Restriction shaft member <NUM> is formed in a columnar shape, and is disposed to extend leftward along the left-right direction from the left plate surface of door base <NUM>. Restriction plate <NUM> is fit to restriction shaft member <NUM> at the upper end portion so as to be rotatable around restriction shaft member <NUM>. In addition, second spring <NUM> is disposed at restriction shaft member <NUM>. Second spring <NUM> is a torsion spring. Second spring <NUM> biases and rotates restriction plate <NUM> counterclockwise in <FIG> around restriction shaft member <NUM>.

As illustrated in <FIG>, regarding restriction plate <NUM>, when door <NUM> is in a closed state and holding part <NUM> is located at close position Ph1, protrusion <NUM> makes contact with the rear surface and the rotation of second spring <NUM> is restricted.

As described above, when holding part <NUM> is rotated from close position Ph1 and set at open position Ph2, engage pin <NUM> and in turn protrusion <NUM> move to the opening of engaged portion <NUM> as illustrated in <FIG>. In this manner, protrusion <NUM> moves rearward relative to restriction plate <NUM>, and thus restriction plate <NUM> rotates around restriction shaft member <NUM> counterclockwise in <FIG> with the biasing force of second spring <NUM>.

As illustrated in <FIG>, the rotated restriction plate <NUM> is located at restriction position Ps where the lower front end portion makes contact with contacted surface 33a of protrusion <NUM>. In the rotational direction around second rotation axis 31a, contacted surface 33a of protrusion <NUM> is the surface formed on the side opposite to the surface at which protrusion <NUM> makes contact with stopper <NUM> when holding part <NUM> is located at open position Ph2. When the lower front end portion of restriction plate <NUM> and contacted surface 33a of protrusion <NUM> are in contact with each other, the rotation of protrusion <NUM> and in turn casing <NUM> around second rotation axis 31a is restricted.

In addition, as illustrated in <FIG>, <FIG> and <FIG>, locking device <NUM> further includes fourth spring <NUM>. Fourth spring biases and rotates casing <NUM> clockwise in <FIG> and <FIG>. More specifically, fourth spring <NUM> is a tensile coil spring. Fourth spring <NUM> is disposed between holding plate 56a and door base <NUM>.

First end portion <NUM> of fourth spring <NUM> is attached to hook part 20a of door base <NUM>. Since door base <NUM> is fixed to door <NUM>, first end portion <NUM> of fourth spring <NUM> does not move with respect to door base <NUM> even when casing <NUM> rotates (<FIG> and <FIG>).

Second end portion <NUM> of fourth spring <NUM> is attached to hook part 56a2 of holding plate 56a. Since holding plate 56a is attached to casing <NUM>, second end portion <NUM> of fourth spring <NUM> moves with respect to door base <NUM> along with the rotation of casing <NUM> and in turn holding plate 56a when casing <NUM> rotates (<FIG> and <FIG>).

Fourth spring <NUM> functions to bring hook part 56a2 of holding plate 56a where second end portion <NUM> is attached closer to hook part 20a of door base <NUM> where first end portion <NUM> is attached within the rotational range of casing <NUM>. That is, fourth spring <NUM> functions to rotate casing <NUM> counterclockwise in <FIG> and <FIG>. In this manner, when the user sets door <NUM> from the open state to the closed state and sets holding part <NUM> from open position Ph2 to close position Ph1, fourth spring <NUM> rotates casing <NUM> so as to set holding part <NUM> from open position Ph2 to close position Ph1. Thus, holding part <NUM> can reliably be set at close position Ph1.

Next, an operation of handle <NUM> in which locking device <NUM> is unlocked by an operation of electromagnetic actuator <NUM> and door <NUM> is set from the closed state to the open state is described from a state where locking device <NUM> is locked.

<FIG> illustrates a state where door <NUM> is in a closed state, holding part <NUM> is located at close position Ph1, and locking device <NUM> is locked. As described above, when holding part <NUM> is located at close position Ph1, restriction region R is formed between protrusion <NUM> and stopper <NUM> (<FIG>). In addition, when locking device <NUM> is locked, movable iron core 51b of electromagnetic actuator <NUM> is located at advanced position Pp1.

When movable iron core 51b is located at advanced position Pp1, restriction part 54d of lever member <NUM> attached to movable iron core 51b through coupling member <NUM> is located at lock position Pk1 where it is fit to restriction region R. Note that in the state where key K is not inserted, pressure member 53a is located at reference position Po1. When restriction part 54d is located at lock position Pk1, pressure member 53a is in contact with first portion S1 in hole 54c of lever member <NUM>.

When restriction part 54d is located at lock position Pk1, the rotation of protrusion <NUM> around second rotation axis 31a and in turn the rotation of holding part <NUM> from close position Ph1 to open position Ph2 are restricted as described above. That is, the operation of handle <NUM> is restricted. Further, when holding part <NUM> is located at close position Ph1 in the state where door <NUM> is in a closed state, engaged portion <NUM> of casing <NUM> and engage pin <NUM> are engaged with each other as described above, and thus door <NUM> is restricted from being set from the closed state to the open state.

When the user presses an unlocking switch (not illustrated in the drawing) disposed in operation panel 3a to unlock locking device <NUM>, an unlocking signal for allowing the operation of handle <NUM> is output from the control device. In response to reception of the unlocking signal, control part <NUM> energizes magnetic coil 51e in the retraction direction. In this manner, movable iron core 51b retracts from advanced position Pp1 toward retraction position Pp2 as described above.

When coupling member <NUM> rotates clockwise in <FIG> around coupling shaft member <NUM> in accordance with the retraction of movable iron core 51b, attaching portion 54b of lever member <NUM> moves upward. Lever member <NUM> rotates counterclockwise in <FIG> around first rotation axis 54a in accordance with the upward movement of attaching portion 54b, and restriction part 54d is set from lock position Pk1 to unlock position Pk2 outside restriction region R as illustrated in <FIG>.

Note that pressure member 53a is kept at reference position Po1 because the operation with key K is not performed. When lever member <NUM> rotates such that restriction part 54d moves from lock position Pk1 to unlock position Pk2, hole 54c rotates counterclockwise in <FIG> around first rotation axis 54a while pressure member 53a does not press the inner peripheral surface of hole 54c as described above. Thus, pressure member 53a does not inhibit the rotation of lever member <NUM>. As illustrated in <FIG>, when restriction part 54d is located at unlock position Pk2, pressure member 53a located at reference position Po1 is in contact with second portion S2 in hole 54c of lever member <NUM>.

When restriction part 54d is located at unlock position Pk2, the rotation of protrusion <NUM> around second rotation axis 31a and in turn the rotation of holding part <NUM> from close position Ph1 to open position Ph2 are allowed as described above. That is, the operation of handle <NUM> is allowed.

When holding part <NUM> is rotated from close position Ph1 toward open position Ph2 by the user, casing <NUM> and in turn protrusion <NUM> rotate counterclockwise in <FIG> around second rotation axis 31a.

Since terminal T to which electric wire C is connected is disposed near second rotation axis 31a in electromagnetic actuator <NUM> as described above, the movement amount of terminal T and in turn the displacement amount of electric wire C connected to terminal T due to displacement are suppressed. Thus, the stress applied to electric wire C can be suppressed. Further, since the displacement amount of electric wire C is reduced, the length of electric wire C can be reduced. Thus, no obstruction is caused by electric wire C in casing <NUM>.

Further, as described above, terminal T is disposed near second rotation axis 31a than the second end portion of movable iron core 51b. Attaching portion 54b is attached to the second end portion of movable iron core 51b through coupling member <NUM>. That is, attaching portion 54b is disposed away from second rotation axis 31a and in turn base shaft member <NUM>, than terminal T. Thus, the movement of attaching portion 54b and in turn the rotation amount of lever member <NUM> can be appropriately set without being limited by base shaft member <NUM>.

Casing <NUM> and in turn protrusion <NUM> rotate and protrusion <NUM> makes contact with stopper <NUM>, and thus, the rotation of protrusion <NUM> and in turn the rotation of holding part <NUM> are restricted, setting holding part <NUM> at open position Ph2 as illustrated in <FIG>.

In addition, when holding part <NUM> is located at open position Ph2, engage pin <NUM> moves to the opening of engaged portion <NUM>. In this manner, door <NUM> is allowed to be set from the closed state to the open state as described above.

When holding part <NUM> is located at open position Ph2, restriction plate <NUM> is located at restriction position Ps where the lower front end portion makes contact with contacted surface 33a of protrusion <NUM> as described above. In this manner, the rotation of protrusion <NUM> and in turn casing <NUM> around second rotation axis 31a, and in turn the formation of restriction region R between protrusion <NUM> and stopper <NUM> are restricted. Thus, restriction part 54d cannot move from unlock position Pk2 to lock position Pk1. That is, locking of locking device <NUM> is restricted when holding part <NUM> is located at open position Ph2 and door <NUM> is in the open state.

Next, an operation of handle <NUM> in which door <NUM> is set from the open state to the closed state, and locking device <NUM> is locked by an operation of electromagnetic actuator <NUM> is described from the open state of door <NUM> illustrated in <FIG>.

As described above, when door <NUM> is in the open state, locking device <NUM> is unlocked, holding part <NUM> is located at open position Ph2, and restriction plate <NUM> is located at restriction position Ps. In the case where restriction plate <NUM> is located at restriction position Ps, when door <NUM> is closed and engage pin <NUM> moves toward the second end portion side (depth side) of engaged portion <NUM>, protrusion <NUM> presses the rear surface of restriction plate <NUM> and thus restriction plate <NUM> rotates clockwise in <FIG> around restriction shaft member <NUM>. With the rotation of restriction plate <NUM>, restriction plate <NUM> moves away from restriction position Ps, and thus protrusion <NUM> and in turn casing <NUM> are allowed to rotate around second rotation axis 31a.

When door <NUM> is closed by the user and holding part <NUM> is rotated from open position Ph2 toward close position Ph1, casing <NUM> and in turn protrusion <NUM> rotate clockwise in <FIG> around second rotation axis 31a, and engage pin <NUM> is further advanced to the depth side (i.e., second end portion side) of engaged portion <NUM>. When engage pin <NUM> is located at the second end portion of engaged portion <NUM>, the rotation of casing <NUM> and in turn the rotation of holding part <NUM> are restricted, and thus holding part <NUM> is located at close position Ph1 as illustrated in <FIG>.

When engage pin <NUM> is located at the second end portion of engaged portion <NUM>, door <NUM> is restricted from being set from the closed state to the open state as described above. When holding part <NUM> is located at close position Ph1, restriction region R is formed between protrusion <NUM> and stopper <NUM>.

When the user presses the lock switch (not illustrated in the drawing) disposed in operation panel 3a to lock locking device <NUM>, the locking signal for restricting the operation of handle <NUM> is output from the control device. In response to reception of the locking signal, control part <NUM> energizes magnetic coil 51e in the advancing direction. In this manner, movable iron core 51b is advanced from retraction position Pp2 toward advanced position Pp1 as described above.

When coupling member <NUM> rotates counterclockwise in <FIG> around coupling shaft member <NUM> in accordance with the advance of movable iron core 51b, attaching portion 54b of lever member <NUM> move downward. Lever member <NUM> rotates clockwise in <FIG> around first rotation axis 54a in accordance with the downward movement of attaching portion 54b, and restriction part 54d is set from unlock position Pk2 to lock position Pk1 where it is fit to restriction region R as illustrated in <FIG>.

Note that pressure member 53a is kept at reference position Po1 because the operation with key K is not performed. When lever member <NUM> rotates such that restriction part 54d moves from unlock position Pk2 to lock position Pk1, hole 54c rotates clockwise in <FIG> around first rotation axis 54a while pressure member 53a does not press the inner peripheral surface of hole 54c as described above. Thus, pressure member 53a does not inhibit the rotation of lever member <NUM>.

As described above, with the operation of electromagnetic actuator <NUM>, restriction part 54d moves between unlock position Pk2 and lock position Pk1. That is, locking device <NUM> is unlocked and locked through the operation of electromagnetic actuator <NUM>.

Next, an operation of handle <NUM> in which locking device <NUM> is unlocked by an unlocking operation of key K when holding part <NUM> is located at close position Ph1 is described from a state where locking device <NUM> is locked and key K is not inserted as illustrated in <FIG>.

In the state where key K is not inserted, pressure member 53a is located at reference position Po1 as described above. When restriction part 54d is located at lock position Pk1 because locking device <NUM> is locked, pressure member 53a is in contact with first portion S <NUM> in hole 54c of lever member <NUM>.

When the unlocking operation is performed by the user by inserting key K to key hole H, pressure member 53a rotates clockwise in <FIG> around the central axis of manual rotation member <NUM> as described above and moves toward drawing position Po2 (<FIG>).

When moving toward drawing position Po2, pressure member 53a presses first portion S1. In response to the press of first portion S1, lever member <NUM> rotates counterclockwise in <FIG> around first rotation axis 54a, restriction part 54d moves from lock position Pk1 toward unlock position Pk2, and attaching portion 54b moves upward. Further, in accordance with the upward movement of attaching portion 54b, movable iron core 51b coupled with attaching portion 54b through coupling member <NUM> moves from advanced position Pp1 toward retraction position Pp2 against the magnetic force of permanent magnet 51d.

As illustrated in <FIG>, when pressure member 53a is located at drawing position Po2, pressure member 53a is in contact with first portion S1, restriction part 54d is located at unlock position Pk2, and movable iron core 51b is located at retraction position Pp2.

Further, when key K is rotated counterclockwise in <FIG> around the central axis of manual rotation member <NUM> by the operator to pull out key K, pressure member 53a moves from drawing position Po2 toward reference position Po1. In other words, pressure member 53a moves from first portion S1 toward second portion S2 in hole 54c. When pressure member 53a moves from drawing position Po2 toward reference position Po1, pressure member 53a moves in hole 54c without pressing the inner peripheral surface of hole 54c. That is, when pressure member 53a moves from drawing position Po2 toward reference position Po1, it moves away from first portion S1 without swaying lever member <NUM>.

As illustrated in <FIG>, when pressure member 53a returns to reference position Po1 in the state where restriction part 54d is located at unlock position Pk2, pressure member 53a makes contact with second portion S2 of hole 54c as described above. As described above, locking device <NUM> is unlocked through the unlocking operation of key K.

As described above, when pressure member 53a makes the first back-and-forth movement between reference position Po1 and drawing position Po2 in the state where restriction part 54d is located at lock position Pk1 (<FIG>), pressure member 53a presses first portion S1 to rotate lever member <NUM> and set restriction part 54d at unlock position Pk2 in the forward movement of the first back-and-forth movement (<FIG>). Further, pressure member 53a moves away from first portion S1 without rotating lever member <NUM> and moves toward second portion S2 in hole 54c in the backward movement of the first back-and-forth movement (<FIG>).

Note that as illustrated in <FIG>, when pressure member 53a makes the first back-and-forth movement between reference position Po1 and drawing position Po2 in the state where restriction part 54d is located at unlock position Pk2, pressure member 53a moves in hole 54c without pressing the inner peripheral surface. Thus, lever member <NUM> is located at unlock position Pk2 without being rotated.

In addition, in accordance with the unlocking operation of key K, movable iron core 51b of electromagnetic actuator <NUM> moves from advanced position Pp1 to retraction position Pp2 as described above. That is, electromagnetic actuator <NUM> performs the same operation as the operation of electromagnetic actuator <NUM> unlocking locking device <NUM> in accordance with the unlocking operation of key K without being energized. Thus, the state of locking device <NUM> where locking device <NUM> is unlocked by the unlocking operation of key K, and the state of locking device <NUM> where locking device <NUM> is unlocked by the above-described electromagnetic actuator <NUM> become the same (<FIG>).

Next, an operation of handle <NUM> when locking device <NUM> is locked through a locking operation of key K in the state where holding part <NUM> is located at close position Ph1 is described from a state where locking device <NUM> is unlocked and key K is not inserted as illustrated in <FIG>.

In the state where key K is not inserted, pressure member 53a is located at reference position Po1 as described above. When restriction part 54d is located at unlock position Pk2 because locking device <NUM> is unlocked, pressure member 53a is in contact with second portion S2 in hole 54c of lever member <NUM>.

When the locking operation is performed by inserting key K to key hole H by the user, pressure member 53a rotates counterclockwise in <FIG> around the central axis of manual rotation member <NUM> and moves toward push position Po3 as described above (<FIG>).

When moving toward push position Po3, pressure member 53a presses second portion S2. When lever member <NUM> rotates clockwise in <FIG> around first rotation axis 54a in response to the press of second portion S2, restriction part 54d moves from unlock position Pk2 toward lock position Pk1, and attaching portion 54b moves downward. Further, in accordance with the downward movement of attaching portion 54b, movable iron core 51b coupled with attaching portion 54b through coupling member <NUM> moves from retraction position Pp2 toward advanced position Pp1 against the magnetic force of permanent magnet 51d.

At this time, long hole 55b in contact with attaching portion 54b is the force point, and groove part 55a in contact with movement shaft member <NUM> is the operation point. The distance to the fitted part of coupling shaft member <NUM> as the fulcrum is shorter from groove part 55a than from long hole 55b. Thus, manual rotation member <NUM> can be rotated with key K against the magnetic force of permanent magnet <NUM>1d of electromagnetic actuator <NUM> and the biasing force of first spring 51c with a smaller force than in the case where locking device <NUM> does not include coupling member <NUM> and movable iron core 51b is directly attached to attaching portion 54b.

As illustrated in <FIG>, when pressure member 53a is located at push position Po3, restriction part 54d is located at lock position Pk1 and movable iron core 51b is located at advanced position Pp1.

Further, when key K is rotated clockwise in <FIG> around the central axis of manual rotation member <NUM> by the operator to pull out key K, pressure member 53a moves from push position Po3 toward reference position Po1. In other words, pressure member 53a moves from second portion S2 toward first portion S1 in hole 54c. When pressure member 53a moves from push position Po3 toward reference position Po1, pressure member 53a moves in hole 54c without pressing the inner peripheral surface of hole 54c. That is, when pressure member 53a moves from push position Po3 toward reference position Po1, it moves away from second portion S2 without swaying lever member <NUM>.

As illustrated in <FIG>, when restriction part 54d is located at lock position Pk1 and pressure member 53a returns to reference position Po1, pressure member 53a makes contact with first portion S1 of hole 54c as described above. As described above, locking device <NUM> is locked through the locking operation of key K.

As described above, when pressure member 53a makes the second back-and-forth movement between reference position Po1 and push position Po3 in the state where restriction part 54d is located at unlock position Pk2 (<FIG>), pressure member 53a presses second portion S2 to rotate lever member <NUM> and set restriction part 54d to lock position Pk1 in the forward movement of the second back-and-forth movement (<FIG>). Further, pressure member 53a moves away from second portion S2 without rotating lever member <NUM>, and moves toward first portion S1 in hole 54c in the backward movement of the second back-and-forth movement (<FIG>).

Note that as illustrated in <FIG>, when pressure member 53a makes the second back-and-forth movement between reference position Po1 and push position Po3 in the state where restriction part 54d is located at lock position Pk1, pressure member 53a moves in hole 54c without pressing the inner peripheral surface. Thus, lever member <NUM> is set at lock position Pk1 without being rotated.

In addition, movable iron core 51b of electromagnetic actuator <NUM> moves from retraction position Pp2 to advanced position Pp1 in accordance with the locking operation of key K as described above. That is, electromagnetic actuator <NUM> makes the same operation as the operation of electromagnetic actuator <NUM> locking locking device <NUM> in accordance with the locking operation of key K with being energized. Thus, the state of locking device <NUM> where locking device <NUM> is locked through the locking operation of key K, and the state of locking device <NUM> where locking device <NUM> is locked by the above-described electromagnetic actuator <NUM> become the same (<FIG>).

In addition, as described above, the state of locking device <NUM> where locking device <NUM> is unlocked through the unlocking operation of key K, and the state of locking device <NUM> where locking device <NUM> is unlocked by the above-described electromagnetic actuator <NUM> become the same (<FIG>). Thus, even after locking device <NUM> is unlocked by either the unlocking operation of key K or the operation of electromagnetic actuator <NUM>, locking device <NUM> can be locked by either the locking operation of key K or the operation of electromagnetic actuator <NUM>. In addition, even after locking device <NUM> is locked by either the locking operation of key K or the operation of electromagnetic actuator <NUM>, locking device <NUM> can be unlocked by either the unlocking operation of key K or the operation of electromagnetic actuator <NUM>. That is, regardless of whether it has been locked by manual way or electrical way, the user can easily lock and unlock the door without the hassle of operating the handle. Even if the electronic lock cannot be used, for example, during a power failure, the key K can be used to reliably unlock the lock.

In addition, when the user sets door <NUM> from the open state to the closed state and moves holding part <NUM> from open position Ph2 to close position Ph1, the movement amount of protrusion <NUM> becomes insufficient if the rotation amount of casing <NUM> is insufficient. Consequently, the movement amount of restriction part 54d may become insufficient due to restriction part 54d interfering with protrusion <NUM>, and restriction part 54d may not be set at restriction region R (<FIG>), failing to lock with locking device <NUM>.

In particular, in the case of the locking with electromagnetic actuator <NUM>, the user cannot know the rotation amount of key K, i.e., the movement amount of restriction part 54d unlike the locking with key K. Consequently, at the time of locking with electromagnetic actuator <NUM>, the user may not recognize the fact that the locking has not been made due to the insufficient movement amount of restriction part 54d.

However, when the user sets holding part <NUM> from open position Ph2 to close position Ph1, fourth spring <NUM> rotates casing <NUM> as described above. Thus, the rotation amount of casing <NUM> and in turn the movement amount of protrusion <NUM> do not become insufficient, and holding part <NUM> is reliably set to close position Ph1. Thus, restriction part 54d is located at restriction region R without interfering with protrusion <NUM>, and the locking with locking device <NUM> can be reliably made. In addition, in the state where unlocking has been made with locking device <NUM>, movement of holding part <NUM> from close position Ph1 to open position Ph2 against the user's will can be prevented.

The present invention is not limited to the forms described so far. As long as the main purpose of this invention is not departed from, various modifications to this embodiment and embodiments constructed by combining components in different embodiments are also included within the scope of this invention, being defined by the appended claims.

For example, attaching portion 54b of lever member <NUM> may be provided between first rotation axis 54a and hole 54c. In addition, hole 54c of lever member <NUM> may be provided between first rotation axis 54a and attaching portion 54b.

In addition, coupling member <NUM> may be engaged with movable iron core 51b on one end side, engaged with attaching portion 54b on the other end side, and fitted with coupling shaft member <NUM> between the one end side and the other end side.

In addition, electromagnetic actuator <NUM> may be disposed at casing <NUM> such that magnetic coil 51e is apart from second rotation axis 31a of base shaft member <NUM> than attaching portion 54b.

In addition, electromagnetic actuator <NUM> may be disposed in the direction orthogonal to lever member <NUM> and second rotation axis 31a.

In addition, locking device <NUM> may not include coupling member <NUM>. In this case, the second end portion of movable iron core 51b is directly attached to attaching portion 54b. In this case, movable iron core 51b is an example of "moving member".

In addition, locking device <NUM> may not include third spring <NUM>.

In addition, while locking device <NUM> is unlocked by electromagnetic actuator <NUM> in response to an operation of the unlocking switch in the above-described example, locking device <NUM> may be unlocked by electromagnetic actuator <NUM> in response to authentication of the user and an operation of the unlocking switch. Authentication of the user is performed using, for example, an ID card that stores identification information identifying the user and facial recognition.

In addition, electromagnetic actuator <NUM> may be configured with a push or pull solenoid.

In addition, locking device <NUM> may not include electromagnetic actuator <NUM>. When electromagnetic actuator <NUM> is not provided, locking device <NUM> does not include coupling member <NUM>. In this case, locking device <NUM> is locked and unlocked only by key K. In this case, the number of components can be reduced and locking device <NUM> can be configured in a cost-effective manner. In addition, since lever member <NUM> includes attaching portion 54b, electromagnetic actuator <NUM> can be retrofitted as needed, and the function of locking device <NUM> can be readily increased.

In addition, locking device <NUM> is applicable not only to refrigeration device <NUM>, but also to devices including a box with a door, and the like.

Claim 1:
A locking device (<NUM>) comprising:
a lever member (<NUM>) configured to sway around a first rotation axis (54a) and including a restriction part (54d) configured to restrict an operation of a handle (<NUM>), a hole (54c), and an attaching portion (54b) where a moving member (<NUM>) configured to move in accordance with an operation of an electromagnetic actuator (<NUM>) is attached; and
a pressure member (53a) disposed in the hole (54c) and configured to make a first back-and-forth movement in the hole (54c) in accordance with an unlocking operation of a key (K), wherein
the pressure member (53a) moves the restriction part (54d) from a position for restricting the operation of the handle (<NUM>) to a position for allowing the operation of the handle (<NUM>) by swaying the lever member (<NUM>) around the first rotation axis (54a) by pressing a first portion (S1) in a forward movement of the first back-and-forth movement, and moves away from the first portion (S1) without swaying the lever member (<NUM>) in a backward movement of the first back-and-forth movement, the first portion (<NUM>) being a portion of an inner peripheral surface of the hole (54c).