JP2019183486A - Latch locking device and door device - Google Patents

Abstract

To provide a latch locking device capable of preventing the opening operation of a door body from being unable, and a door device provided with the latch locking device.SOLUTION: A latch locking device 10 includes a latch member 20, a cam member 22, and a locking mechanism 24. The cam member 22 has a cam body 40 which rotates in conjunction with a handle 14, and arms 42a, 42b abutting the latch member 20 and causing the latch member 20 to move in a direction in which a latch 28 is immersed in a lock case 18. The lock mechanism 24 has a lock member 48 for restricting the rotation of the cam body 40 by abutting against the cam body 40 in a state where the latch 28 is in a position protruding outside the lock case 18.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a latch lock device and a door device in which the latch lock device is assembled to a door.

  For example, a door device that partitions the interior and exterior of a building such as a house includes a latch that engages with a recess on the frame side by appearing and protruding from a prospective surface of the door body, and a latch lock device that locks and unlocks the door body May be provided. For example, in Patent Document 1, a latch member that protrudes and retracts from the outer surface of the lock case is provided on the tip side, and the latch member rotates in conjunction with the rotation operation of the handle so that the latch is inserted into the lock case. A latch locking device is disclosed that includes a cam member to be moved and a lock mechanism that restricts movement of the latch member.

Japanese Patent No. 3585865

  In the cam member of Patent Document 1, an arm for moving the latch member protrudes from the outer peripheral surface of the cam body with which the rotating shaft of the handle is fitted. The lock mechanism has a structure in which the lock member that moves in conjunction with the thumb turn engages the tip of the arm of the cam member, thereby restricting the movement of the latch member. For this reason, in a locked state in which the movement of the latch member is restricted by the lock member, for example, when the handle is impactively rotated in the opening direction, the arm is pressed against the lock member with a strong force. As a result, when the arm is broken, the locked state of the latch cannot be released by the handle operation, and the door may not be opened. If it does so, it will be in the situation where a user cannot open a door, if a door and a latch locking device are not destroyed. Particularly, in this configuration, since the lock member locks the protruding end of the arm, when the cam member is forcibly rotated by the handle, a considerable moment force is applied to the arm. The structure is more easily damaged.

  The present invention has been made in consideration of the above-described problems of the prior art, and an object of the present invention is to provide a latch lock device that can prevent the opening operation of the door from being disabled, and a door device including the latch lock device. And

  The latch lock device according to the present invention is provided so as to be able to advance and retreat inside the lock case, and the latch provided at the distal end side rotates in conjunction with the rotation operation of the handle and the latch member that can be projected and retracted from the outer surface of the lock case. And a locking mechanism that restricts movement of the latch member in a direction in which the latch is retracted into the lock case. A cam body that rotates in conjunction with the handle; and an arm that contacts the latch member and moves the latch member in a direction in which the latch is retracted into the lock case. And a lock member for restricting rotation of the cam body by contacting the cam body in a state where the latch is in a position protruding out of the lock case. .

  According to such a configuration, the lock member abuts against the cam body and restricts the rotation of the cam body, whereby the latch lock device is locked. For this reason, for example, in this locked state, even if the handle is forcibly rotated in the opening direction with a very large force, the lock member or a part of the cam body may be damaged. There is no damage. Accordingly, even when a part of the cam body is damaged by such forced rotation of the handle, for example, the latch member can be moved via the arm by the subsequent rotation operation of the handle in the opening direction. . As a result, since the latch can be inserted into the lock case, the opening operation of the door body is not disabled, and the user can easily open the door body by operating the handle.

  In the latch locking device according to the present invention, the cam body is provided with a recess or a protrusion, and the lock member rotates the cam body by contacting the recess or the protrusion of the cam body. It is good also as a structure to regulate. Then, the rotation of the cam body can be more reliably regulated by the lock member.

  In the latch locking device according to the present invention, the lock member is disposed at a position facing the base end surface of the latch member in a state of being in contact with the cam body, and the latch member is the lock member. It is good also as a structure which has a groove part which can insert. Then, even if the lock mechanism malfunctions in the locked state, and the lock member is locked when the position of the latch member is fixed within the forward / backward movement range, the latch member should move around the groove to avoid the lock member. Can do.

  In the latch lock device according to the present invention, the latch member connects the latch provided on a distal end side, a head provided on a proximal end side, and the latch and the head, and the head A shaft portion having a smaller diameter, the head portion is provided so as to swell from an outer peripheral surface of the shaft portion, a contact surface on which the arm contacts from the latch side, and a side opposite to the latch side And the groove portion has a slit shape cut in the axial direction of the latch member from the base end surface, and the lock member has a flat plate shape that can be inserted into the groove portion. It is good also as a structure to have. If it does so, a locking member can be inserted more reliably with respect to the groove part of a latch member. Further, for example, when the handle is forcibly rotated in the opening direction with a very large force, there is a possibility that the arm of the cam member falls over the contact surface of the head of the latch member. . However, even in this drop-off state, the latch member expands and contracts in the radial direction due to the elasticity of the slit-shaped groove, so it is easy to rotate the handle in the closing direction opposite to the opening direction. The contact state between the latch member and the arm can be restored.

  The door device according to the present invention includes the latch lock device having the above-described configuration and a door body to which the latch lock device is assembled. According to such a configuration, for example, even when the handle is forcibly rotated in the opening direction with an extremely large force, and the latch lock device has malfunctioned, the door is opened without destroying the door. It becomes possible.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the opening operation of a door becomes impossible.

It is a front view which shows the internal structure in the unlocking state of the latch lock apparatus which concerns on one Embodiment of this invention. It is a side view in the state where the latch locking device shown in Drawing 1 was attached to a door. It is a front view in the state where the handle of the latch lock device shown in Drawing 1 was rotated in the opening direction. It is a front view which shows the internal structure in the locking state of the latch locking device shown in FIG. FIG. 5A is a plan view of the latch member, and FIG. 5B is a front view of the latch member. It is a perspective view which shows the structure of a cam member. FIG. 7A is an enlarged plan view of a main part showing a state in which the latch member has dropped from the arm of the cam member, and FIG. 7B is a diagram in which the handle is rotated from the state shown in FIG. FIG. 7C is a main part enlarged plan view showing a state, and FIG. 7C is a main part showing a state where the engagement state between the latch member and the arm of the cam member is restored from the state shown in FIG. It is an enlarged plan view. FIG. 8A is an enlarged plan view of the main part showing the positional relationship among the latch member, the arm, and the lock member in the locked state, and FIG. 8B shows the handle from the state shown in FIG. FIG. 8C is a main part enlarged plan view showing a state in which the latch member is forcibly moved from the state shown in FIG. 8A. is there. FIG. 9A is an enlarged front view of a main part showing an internal structure in an unlocked state of a latch locking device provided with a cam body according to a modified example, and FIG. 9B is a plan view of FIG. It is a principal part enlarged front view which shows the internal structure in the locking state of the latch lock apparatus shown.

  Hereinafter, a latch lock device according to the present invention will be described in detail with reference to the accompanying drawings by exemplifying a preferred embodiment by exemplifying a door device including the device.

  FIG. 1 is a front view showing an internal structure of a latch lock device 10 according to an embodiment of the present invention in an unlocked state. FIG. 2 is a side view of the latch lock device 10 shown in FIG. FIG. 3 is a front view showing a state in which the handle 14 of the latch lock device 10 shown in FIG. 1 is rotated in the opening direction. FIG. 4 is a front view showing the internal structure of the latch lock device 10 shown in FIG. 1 in a locked state. The latch lock device 10 according to the present embodiment is assembled on the door end side of the door body 12 of the door device 16 that partitions the interior and exterior of a building such as a house, and holds the door body 12 in a closed position. Is a device for locking and unlocking.

  As shown in FIGS. 1 and 2, the latch lock device 10 includes a lock case 18, a latch member 20, a cam member 22, and a lock mechanism 24.

  The lock case 18 is a case made of metal or resin. The lock case 18 includes a housing portion 18 a that houses the latch member 20, the cam member 22, and the lock mechanism 24 therein, and a mounting plate 18 b that is attached to the prospective surface 12 a of the door 12 substantially flush. The housing portion 18a forms a storage space for the latch member 20 and the like by bonding a pair of cover members 18c and 18c in the prospective direction. In FIG. 1 etc., the state which removed one cover material 18c from the other cover material 18c is shown. The mounting plate 18 b is fastened to the prospective surface 12 a of the door 12 using a pair of upper and lower screws 26, 26 (see FIG. 2), whereby the latch lock device 10 is fixed to the door 12.

  In the present application, the prospective direction refers to the indoor / outdoor direction of the door device 16, that is, the direction from the indoor side to the outdoor side or the opposite direction (the direction indicated by the arrow Y in the figure), and the prospective surface is the prospective direction. The surface that extends along the line. Of the directions orthogonal to the prospective direction, the vertical direction corresponding to the height direction of the door device 16 is indicated by an arrow Z in the drawing, and the left-right direction corresponding to the width direction of the door device 16 is indicated by an arrow X in the drawing. Accordingly, with respect to the latch lock device 10 as well, with reference to the state of attachment to the door 12 shown in FIGS. 1 and 2, the arrows X, Y, and Z are shown in the drawings to indicate the arrangement and operation direction of each member. explain.

  FIG. 5A is a plan view of the latch member 20, and FIG. 5B is a front view of the latch member 20. As shown in FIGS. 1 and 5, the latch member 20 is provided in the housing portion 18 a of the lock case 18 so as to advance and retreat along the width direction (X direction) of the door 12. The latch member 20 is a so-called latch bolt including a latch 28, a head portion 30, and a shaft portion 32. The latch member 20 is provided substantially in the center in the vertical direction in the lock case 18.

  The shaft portion 32 is a round bar portion made of metal or resin. A large-diameter flange portion 32a is provided substantially in the center in the axial direction of the shaft portion 32. The housing portion 18a is formed with a cylinder portion 18d through which the shaft portion 32 is inserted so as to be able to advance and retract. The flange portion 32 a is accommodated in the cylinder portion 18 d, thereby restricting the advance / retreat range of the latch member 20, and serves as a seating plate for the coil spring 34 that is extrapolated to the shaft portion 32. The coil spring 34 always urges the flange portion 32a (latch member 20) in the direction in which the latch 28 protrudes out of the lock case 18 (left side in FIG. 1). Hereinafter, for the latch member 20, the direction in which the latch 28 protrudes out of the lock case 18 is referred to as a latch protruding direction, and the direction opposite to the latch protruding direction (right side in FIG. 1) is sometimes referred to as a latch retracting direction.

  The latch 28 is a triangular prism shaped part formed of metal or resin, and is provided at the tip of the shaft portion 32. The latch 28 can be projected and retracted from the outer surface (mounting plate 18b) of the lock case 18 through an opening 18e formed in the mounting plate 18b. The latch 28 protrudes out of the lock case 18 due to the urging force of the coil spring 34 when no external force is received.

  The door 12 is supported so as to be openable and closable inside a frame 36 installed in a housing opening of the building. A latch recess 36 a is formed on the prospective surface of the frame 36. The latch 28 can enter the latch recess 36 a when the door 12 is closed with respect to the frame 36. The latch 28 has a sliding surface 28a facing the closing direction of the door 12 with respect to the frame 36 and a locking surface 28b facing the opening direction of the door 12 from the frame 36 (FIG. 5A). reference). When closing the door body 12, the latch 28 slides into the lock case 18 against the urging force of the coil spring 34 by the sliding surface 28 a sliding on the frame body 36. When the door 28 is closed, the latch 28 enters the latch recess 36a, whereby the locking surface 28b is locked by the inner surface of the latch recess 36a, and as a result, the door 12 is held in the closed position.

  The head portion 30 is a truncated cone-shaped portion that is integrally formed with the base end of the shaft portion 32 and has a larger diameter than the shaft portion 32. The head 30 has a contact surface 30a, a base end surface 30b, and a tapered surface 30c. The contact surface 30a is a ring-shaped prospective surface that is provided so as to swell from the shaft portion 32 in the outer diameter direction and faces the latch 28 side. The base end surface 30b is a circular prospective surface located at the base end of the latch member 20 and facing the side opposite to the latch 28 side. The tapered surface 30c is a tapered ring-shaped inclined surface whose outer diameter gradually decreases from the contact surface 30a toward the base end surface 30b.

  Such a latch member 20 is provided with a groove 38 that divides the head 30 side into a bifurcated shape in the vertical direction (see FIG. 5A). The groove portion 38 has a slit shape that is cut from the head 30 toward the latch 28 in the axial direction of the latch member 20, and extends from the base end surface 30 b to the shaft portion 32. Since the latch member 20 includes the groove portion 38, the latch member 20 has elasticity capable of expanding and contracting the head portion 30 and its peripheral portion in the radial direction.

  FIG. 6 is a perspective view showing the configuration of the cam member 22. As shown in FIGS. 1 and 6, the cam member 22 is a part formed of metal or resin, and includes a cam body 40, a pair of arms 42 a and 42 b, and a receiving piece 44. The cam member 22 is disposed below the head 30 of the latch member 20 in the lock case 18.

  The cam body 40 is a substantially cylindrical block body. The cam body 40 is provided with a spline hole 40a, a recess 40b, and a guide portion 40c. The spline hole 40a engages with a spline formed on the rotation shaft of the handle 14 so as not to rotate. The handle 14 is a lever handle that can be rotated manually, for example, and is provided on the interior and exterior surfaces of the door 12 (see FIG. 2). That is, the splines of the indoor and outdoor handles 14 are fitted into the spline holes 40a from the openings on both sides in the prospective direction. As a result, the cam body 40 rotates integrally with the handle 14 in the clockwise direction in the lock case 18 when the handle 14 is rotated clockwise in FIG. 1 from the initial position shown in FIG. . The recess 40b is formed at a position on the upper surface side of the outer peripheral surface 40d of the cam body 40, and opens toward the lock mechanism 24. The guide portions 40c are curved elliptical convex portions, and are provided on both end faces in the prospective direction of the cam body 40, respectively. Each guide portion 40c is slidably engaged with a curved elliptical guide hole 18f formed on the inner surface of each housing portion 18a (see FIG. 1), and guides the rotation of the cam member 22.

  The arms 42 a and 42 b are prismatic members protruding upward from a position on the upper surface side of the outer peripheral surface 40 d of the cam body 40. The arms 42a and 42b are arranged in a prospective direction with a predetermined interval. The shaft portion 32 of the latch member 20 is inserted between the arms 42a and 42b. The arms 42a and 42b are disposed at positions between the outer surface of the cylinder portion 18d and the contact surface 30a of the head portion 30 (see FIG. 1). When the handle 14 is rotated and the cam body 40 rotates about the axis of the spline hole 40a, the arms 42a and 42b rotate around the axis of the spline hole 40a.

  The receiving piece 44 is a plate-like member that protrudes downward from a position on the lower surface side of the outer peripheral surface 40 d of the cam body 40. The receiving member 44 is in contact with a return member 45 on one surface facing the latch 28 side. The return member 45 is always urged in a direction (right side in FIG. 1) in contact with the receiving piece 44 by the coil spring 45a. When the cam body 40 rotates in the opening direction via the handle 14, the return member 45 is pressed by the receiving piece 44 that pivots around the axis of the spline hole 40a. As a result, the return member 45 retreats to the left in FIG. 1 against the biasing force of the coil spring 45a (see FIG. 3). When the operating force of the handle 14 is released from the state shown in FIG. 3, the return member 45 moves to the right in FIG. 1 by the urging force of the coil spring 45 a and presses the receiving piece 44 this time. As a result, the cam body 40 rotates counterclockwise (closed direction) in FIG. 3, and the cam member 22 and the handle 14 return to the initial positions shown in FIG.

  As shown in FIG. 1, the lock mechanism 24 includes a thumb turn shaft 46, a lock member 48, and a link member 50. The lock mechanism 24 is disposed above the cam member 22 and the latch member 20 in the lock case 18.

  The thumb turn shaft 46 is formed of a metal or resin, is a boss-like protrusion protruding from one surface of the link member 50, and has an elongated hole 46a formed at the center. For example, a flat plate provided on a rotation shaft of a thumb turn knob 52 (see FIG. 2) attached to the indoor side surface of the door 12 is fitted into the long hole 46a. Thereby, the thumb turn shaft 46 rotates in conjunction with the rotation operation of the thumb turn knob 52.

  The lock member 48 is a flat plate member made of metal or resin and extending substantially in the vertical direction. The lock member 48 has a thickness that can be inserted into the groove 38 of the latch member 20. The lock member 48 has a rotating shaft 48a protruding in the plate thickness direction (expected direction) at the upper end portion, and a guide shaft 48b protruding in the plate thickness direction at the lower end portion. The rotating shaft 48a is rotatably connected to the link member 50. The guide shaft 48b is slidably engaged with a guide hole 18g extending in the vertical direction on the inner surface of the housing portion 18a. A stopper piece 48c protruding downward is provided on the lower end surface of the lock member 48.

  The link member 50 is a plate-like member made of metal or resin. The link member 50 rotates integrally with the thumb turn shaft 46. When the link member 50 rotates, the rotating shaft 48a pivots around the axis of the thumb turn shaft 46. A first pin 50a protrudes from one surface of the link member 50, and one end of a torsion coil spring 54 is wound around the first pin 50a. The torsion coil spring 54 is supported by extrapolation on a support column 56 protruding from the inner surface of the housing portion 18a, and the other end is wound around a second pin 58 protruding from the inner surface of the housing portion 18a. Thereby, the torsion coil spring 54 always urges the link member 50 (the thumb turn shaft 46) in a direction in which the link member 50 (the thumb turn shaft 46) is rotated counterclockwise (unlocking direction) in FIG. That is, the lock member 48 is always urged upward by the torsion coil spring 54 to retreat from the cam member 22.

  Next, operation | movement of the latch lock apparatus 10 which concerns on this embodiment is demonstrated. First, as shown in FIG. 1, when the door 12 is closed with respect to the frame 36 and the latch 28 is engaged with the latch recess 36a, the lock member 48 is retracted from the cam member 22 (locking position). The latch locking device 10 is unlocked.

  When opening the door 12 from this state, the handle 14 at the initial position shown in FIG. 1 is rotated in the opening direction (clockwise in FIG. 1). Then, the cam body 40 rotates integrally with the handle 14, and the arms 42a and 42b also rotate clockwise in FIG. For this reason, as shown in FIG. 3, the arms 42a and 42b press the contact surface 30a of the head 30 to the right in FIG. 1, and the latch member 20 is moved in the latch insertion direction against the urging force of the coil spring 34. Move. As a result, the latch 28 is immersed in the lock case 18 and the engaged state with the latch recess 36 a is released, so that the user can open the door 12 from the frame 36.

  Next, when the latch locking device 10 is to be locked from the state shown in FIG. 1, the thumb turn knob 52 is rotated in the locking direction. Then, the thumb turn shaft 46 rotates clockwise in FIG. 1, and the link member 50 rotates integrally with the thumb turn shaft 46 against the biasing force of the torsion coil spring 54. As a result, the lock member 48 moves downward (locking direction), and the stopper piece 48c comes into contact with the recess 40b of the cam body 40 (see FIGS. 4 and 6). As a result, the rotation of the cam member 22 in the opening direction is restricted, and the latch locking device 10 enters the locked state shown in FIG. In this state, the rotation of the handle 14 in the opening direction is also restricted by the contact between the recess 40b and the stopper piece 48c. Therefore, the handle 14 is rotated to move the latch member 20 in the latch retracting direction. Retraction of the 28 from the latch recess 36a is restricted.

  As described above, in the latch lock device 10, the stopper piece 48 c of the lock member 48 abuts not the arms 42 a and 42 b of the cam member 22 but the recess 40 b provided in the cam body 40, and the cam body 40 rotates. And is locked. Therefore, for example, in the locked state shown in FIG. 4, even if the handle 14 is forcibly rotated in the opening direction with a very large force, the stopper piece 48c or the recess 40b may be damaged. The arms 42a and 42b are not damaged. Therefore, even when the concave portion 40b is damaged due to the forced rotation of the handle 14, the latch member 20 is moved in the latch insertion direction via the arms 42a and 42b by the subsequent rotation of the handle 14 in the opening direction. Can be moved. As a result, since the latch 28 can be retracted from the latch recess 36a, the opening operation of the door 12 is not disabled, and the user can open the door 12.

  Incidentally, when the handle 14 is forcibly rotated in the opening direction with a very large force, for example, the cam member 22 further rotates from the position shown in FIG. 4, and the arm 42a, as shown in FIG. There is also a possibility that 42b has fallen over the contact surface 30a of the head 30 of the latch member 20 (see FIG. 7A). In this drop-off state, the contact state between the cam member 22 and the latch member 20 is released. However, the latch lock device 10 includes a groove portion 38 on the proximal end side of the latch member 20, and has elasticity that allows the latch member 20 to expand and contract in the radial direction. Therefore, when the drop state of FIG. 7A is reached, the handle 14 is rotated in the closing direction opposite to the opening direction. Then, as shown in FIG. 7 (B), the arms 42a and 42b smoothly slide on the outer peripheral surface of the head 30 (see FIG. 7 (B)) and return to the normal position shown in FIG. 7 (C) again. At the same time, the proximal end side of the latch member 20 is also elastically restored and returns to the original outer diameter. In addition, since the latch member 20 has the tapered surface 30c on the head 30, even if the head 30 completely gets over the arms 42a and 42b, it can be easily returned to the original state.

  On the other hand, in the locked state shown in FIG. 4, if the lock mechanism 24 malfunctions and the position of the lock member 48 is fixed, the contact state between the stopper piece 48 c and the recess 40 b cannot be released. As a result, the user may not be able to open the door 12. Therefore, in order to cancel the locked state, the latch lock device 10 can open the door 12 by, for example, the following two emergency unlocking methods.

  In the first emergency unlocking method, the handle 14 fixed at the initial position shown in FIG. 4 is forcibly rotated in the opening direction with a very large force, and the stopper piece 48c or the recessed portion 40b is broken to change its contact state. It is a method to cancel. That is, in the latch lock device 10, even if the concave portion 40b of the cam member 22 is damaged by this operation, the arms 42a and 42b are not damaged. For this reason, even if the recess 40b is damaged, the cam body 40 can be rotated together with the handle 14 and the arms 42a and 42b can be rotated by rotating the handle 14 in the opening direction as usual. . As a result, since the latch member 20 can be moved in the latch retracting direction and the latch 28 can be retracted from the latch recess 36a, the user can open the door 12.

  In this case, a lock member 48 is arranged in the moving direction of the latch member 20 (see FIG. 8A). However, since the latch lock device 10 is provided with the groove portion 38 on the proximal end side of the latch member 20, the lock member 48 enters the groove portion 38 (see FIG. 8B), and the latch member 20 is locked. It can be moved without interfering with the member 48.

  In the second emergency unlocking method, a thin plate such as a ruler is inserted into the gap between the prospective surface 12a of the door 12 and the prospective surface of the frame 36, and the sliding surface 28a of the latch 28 is pressed. This is a method of forcibly immersing the latch 28 into the lock case 18. Also at this time, as shown in FIG. 8C, since the lock member 48 enters the groove portion 38 of the latch member 20, the latch member 20 can be moved without interfering with the lock member 48. The user can open the door 12. However, this second emergency unlocking method requires that the user can prepare a ruler or the like that presses the latch 28 in a state where the door 12 is closed. In this respect, since the latch locking device 10 can execute not only the second emergency unlocking method but also the first emergency unlocking method described above, the state in which the door 12 cannot be opened more reliably is eliminated. can do.

  It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that the present invention can be freely changed without departing from the gist of the present invention.

  In the above-described embodiment, the stopper piece 48c of the lock member 48 is illustrated as contacting the concave portion 40b of the cam body 40. However, the lock member 48 is provided with a concave portion, and the cam main body 40 is provided with a convex portion that contacts the concave portion 40b. It is good also as a structure. Further, as shown in FIGS. 9A and 9B, the cam main body 40 is not provided with the concave portion 40b or the convex portion, and, for example, a notch that allows the stopper piece 48c of the lock member 48 to contact the outer peripheral surface 40d. It is good also as a structure which provided the shape-shaped contact surface 40e. That is, as long as the lock member 48 can restrict the rotation of the cam body 40, the contact structure (locking structure) may be any of the structures using the recess 40b, the protrusion, and the contact surface 40e. Other configurations may be used.

  10 Latch Lock Device, 12 Door, 14 Handle, 16 Door Device, 18 Lock Case, 20 Latch Member, 22 Cam Member, 24 Lock Mechanism, 28 Latch, 30 Head, 30a Abutting Surface, 30b Base End Surface, 30c Taper Surface, 32 shaft portion, 38 groove portion, 40 cam body, 40b recess, 40d outer peripheral surface, 40e contact surface, 42a, 42b arm, 48 lock member, 48c stopper piece

Claims (5)

A latch member provided so as to be capable of advancing and retreating inside the lock case, and a latch provided on the front end side of the lock case capable of protruding and retracting from the outer surface of the lock case;
A cam member that rotates in conjunction with a rotation operation of the handle and advances and retracts the latch member;
A lock mechanism for restricting movement of the latch member in a direction in which the latch is immersed in the lock case;
A latch locking device comprising:
The cam member has a cam body that rotates in conjunction with the handle, and an arm that contacts the latch member and moves the latch member in a direction in which the latch is immersed in the lock case,
The lock mechanism includes a lock member that restricts rotation of the cam body by contacting the cam body in a state where the latch is in a position protruding out of the lock case. apparatus. The latch locking device according to claim 1,
The cam body is provided with a concave portion or a convex portion,
The latch lock device according to claim 1, wherein the lock member regulates rotation of the cam main body by contacting the concave portion or the convex portion of the cam main body. In the latch locking device according to claim 1 or 2,
The lock member is disposed at a position facing the base end surface of the latch member in a state of being in contact with the cam body
The latch locking device, wherein the latch member has a groove part into which the lock member can be inserted. The latch locking device according to claim 3,
The latch member includes the latch provided on a distal end side, a head provided on a proximal end side, and a shaft having a smaller diameter than the head, connecting the latch and the head. Have
The head is provided so as to swell from the outer peripheral surface of the shaft portion, and has a contact surface on which the arm contacts from the latch side, and a base end surface facing the side opposite to the latch side,
The groove has a slit shape cut from the base end surface in the axial direction of the latch member,
The latch locking device, wherein the lock member has a flat plate shape that can be inserted into the groove.   A door device comprising: the latch lock device according to any one of claims 1 to 4; and a door body to which the latch lock device is assembled.

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