JP6895679B2 - Latch lock - Google Patents

Description

The present invention relates to a latch lock installed on a door.

When the door opens and closes, there is a clicking sound caused by moving in and out of the door (inside the lock box) and returning the latch to its original position.
This sound is jarring in a quiet environment such as a hospital or library, and improvement has been desired. Patent Documents 1 and 2 disclose a configuration for slowing down the moving speed when the latch protrudes from the lock box and making it difficult for sound to be generated.

Japanese Patent No. 3710104 Japanese Patent No. 5659436

By the way, conventional muffling devices such as Patent Documents 1 and 2 slow down the moving speed of the latch, finely adjust the positional relationship between the members to suppress the moving speed of the latch, and move the latch. Adjustment work is required to adjust the speed appropriately. Further, in the conventional muffling device, the return to the original position of the latch needs to elapse a preset time, and cannot be returned quickly. Therefore, it takes time for the latch to function as a latch after the door is closed.
That is, in the configuration of the prior art, it is not possible to suppress the sound generated when the latch returns to the original position and to quickly return the retracted latch to the original position.
Therefore, the present invention provides a latch lock that can mute the sound when the latch returns to the original position and can quickly return the latch to the original position when the door is closed. It is an object.

The invention according to claim 1 for solving the above-mentioned problems is a latch lock combined with a push-pull handle, which has a reversible latch in a main body box and operates the push-pull handle. In a latch lock that allows the latch to be reversed, the pressing member that presses the latch in the protruding direction from the main body box, the urging member that urges the pressing member in the protruding direction, and the latch are engaged with each other. The latch has an anti-reversal member that prevents the latch from reversing, the latch has an engaging recess extending along the direction in which the latch advances and retreats, and the anti-reversing member has a thin plate-shaped engaging portion. The engaging portion of the reverse rotation preventing member moves forward and backward in a direction intersecting the protruding direction of the latch to engage and disengage from the engaging recess of the latch, and operates by operating the push-pull handle. The drive mechanism directly or indirectly engages with the pressing member and the reversing preventing member to cause the pressing member and the reversing preventing member to cooperate with each other. The latch lock is characterized in that the operation of moving the pressing member in the retracting direction and the operation of disengaging the reversing preventing member and the latch are performed in conjunction with each other.
Further, a related invention is a latch lock combined with a push-pull handle, which has a reversible latch in the main body box, and a state in which reversing of the latch is allowed by operating the push-pull handle. In the latch lock, a pressing member that presses the latch in the projecting direction from the main body box, an urging member that urges the pressing member in the projecting direction, and a reversing prevention member that engages with the latch and prevents the latch from reversing. The reversing prevention member has a drive mechanism that moves forward and backward in a direction intersecting the protruding direction of the latch to engage with and disengage the latch, and operates by operating the push-pull handle. The drive mechanism directly or indirectly engages with the pressing member and the reversing preventing member to cause the pressing member and the reversing preventing member to cooperate with each other, and retracts the pressing member by the driving mechanism. The latch lock is characterized in that the operation of moving in the inward direction and the operation of disengaging the reversing prevention member and the latch are executed in combination.

The invention according to claim 1 has a pressing member that presses the latch in the projecting direction from the main body box and an urging member that presses the pressing member in the projecting direction. Therefore, the latch is pressed in the projecting direction and protrudes from the door. There is.
Further, since it has a reversing prevention member that engages with the latch and prevents the latch from reversing, the reversal of the latch when the door is closed is prevented.
Further, since the reversing prevention member moves forward and backward in a direction intersecting the protruding direction of the latch to engage with and disengage from the latch, the reversing prevention member is disengaged from the latch to disengage from the latch. The latch can be flipped.
At that time, since the reversing prevention member advances and retreats in the direction intersecting the protruding direction of the latch, the latch does not follow the advancing and retreating of the reversing preventing member. That is, the reversing prevention member has only a function of switching between a state in which the latch can be reversed and a state in which the latch cannot be reversed, and the posture and position of the latch are not inadvertently changed.
Further, it has a drive mechanism that operates by operating a push-pull handle, and the drive mechanism directly or indirectly engages with the pressing member and the reversing preventing member to link the pressing member and the reversing preventing member. The operation of moving the pressing member in the retracting direction by the drive mechanism and the operation of disengaging the reversing prevention member and the latch are executed in combination.
Therefore, when the latch is in a reversible state, the latch is not pressed by the pressing member. Then, when the door is rotated by the door opening operation, the latch can move in the retracting direction while contacting the door frame and reversing. That is, at this time, the latch receives an external force only from the door frame side, and the posture and position of the latch are changed, but the collision sound between the latch and the door frame is hardly generated.
Further, by operating the push-pull handle, the pressing member moves to the protruding side and approaches the latch, and presses the latch to move it to the protruding position. At the same time, the anti-reverse member approaches and engages with the latch, and the latch becomes irreversible. At that time, if the push-pull handle is operated slowly, the sound caused by the latch returning to the original protruding position is unlikely to be generated.

The invention according to claim 2 is a latch lock combined with a push-pull handle, which has a reversible latch in a main body box, and the reversal of the latch is allowed by operating the push-pull handle. In the latch lock to be in a state, a pressing member that presses the latch in the projecting direction from the main body box, an urging member that urges the pressing member in the projecting direction, and an inversion that engages with the latch to prevent the latch from reversing. It has a blocking member, and the reversing blocking member moves forward and backward in a direction intersecting the protruding direction of the latch to engage with and disengage the latch, and operates a drive mechanism by operating a push-pull handle. The drive mechanism directly or indirectly engages with the pressing member and the reversing preventing member to cause the pressing member and the reversing preventing member to cooperate with each other, and the pressing member is operated by the driving mechanism. The operation of moving the lock in the retracting direction and the operation of disengaging the reversing prevention member and the latch are executed in conjunction with each other, and have a link mechanism portion that engages with the pressing member to operate the pressing member. The link mechanism portion has a link member, the link member swings around a fixed rotation shaft on the link member side fixed to the main body box, and the reversal prevention member swings around the swing main body portion. And a latch engaging portion that engages with the latch, and swings around the reverse rotation prevention member side fixed rotation shaft fixed to the main body box, and the link member and the swing main body portion Is engaged via a connecting shaft, the drive mechanism engages with the swing main body portion or the link member of the reverse rotation prevention member, and the swing main body swings around the fixed rotation shaft on the reverse rotation prevention member side. The link member swings around the fixed rotation shaft on the link member side, or the link member swings around the fixed rotation shaft on the link member side. a feature and be Lula pitch tablets that dynamic main body swings around the inversion preventing member side fixed pivot shaft.

In the invention according to claim 2, the present invention has a link mechanism portion that engages with the pressing member to operate the pressing member, the link mechanism portion has a link member, and the link member is on the link member side fixed to the main body box. It swings around a fixed rotation shaft, and the reversing prevention member has a swing main body portion and a latch engaging portion that engages with a latch, and is fixed to the reversing prevention member side fixed to the main body box. It swings around a rotating shaft, and the link member and the swinging main body are engaged with each other via a connecting shaft.
That is, the link mechanism portion having the link member and the reversing prevention member having the swing main body portion are engaged with each other via the connecting shaft, and the link mechanism portion and the reversing prevention member operate in a linked manner.
Then, the drive mechanism engages with the swing main body or the link member of the reverse rotation prevention member, and the link member links in conjunction with the swing main body swinging around the fixed rotation shaft on the reverse rotation prevention member side. The swing main body swings around the fixed rotation shaft on the member side, or the swing main body swings around the fixed rotation shaft on the link member side. It swings around the axis.

The latch lock of the present invention can reduce the noise generated when the latch retracted into the door protrudes and returns to the original position. Further, when the door is closed, the latch can be quickly returned to the original position by operating the push-pull handle.
That is, the latch lock of the present invention can both suppress the sound generated when the latch returns to the original position and quickly return the latch to the original position.

It is a front view of the latch lock which concerns on embodiment of this invention, and shows the state which the latch is engaged with the receiving part on the door frame side. It is a front view which shows the internal structure of the latch lock of FIG. 1 in a locked state. It is a front view which shows the internal structure of the latch lock of FIG. 1 in the unlocked state. FIG. 3 is a front view showing an internal structure of a latch lock in which a push-pull handle is operated. FIG. 3 is a front view of the internal structure of the latch lock in the unlocked state shown in FIG. 3, excluding the locking mechanism. It is a front view of the internal structure of the latch lock shown in FIG. 4 excluding the locking mechanism. (A) is a perspective view showing a state in which the reversal of the latch is prevented, which is the main part of the latch lock, and (b) is a front view of (a). (A) is a perspective view showing a state in which the latch is reversible, which is the main part of the latch lock, and (b) is a front view of (a). It is a front view of the main part of the latch lock which made it possible to reverse the latch by the operation different from FIG. 8 (b). It is an exploded perspective view of the main part of a latch lock. FIG. 10 is a cross-sectional perspective view of the pressing member and the compression spring of FIG. It is a perspective view of the lock box of the latch lock of FIG. (A) is a perspective view seen from above the retracting side of the latch case, (b) is an exploded perspective view of (a), and (c) is a perspective view seen from below the protruding side of the latch case. .. (A) is a perspective view seen from above the retracting side of the latch, and (b) is a perspective view seen from below the protruding side of the latch. It is a perspective view which shows the state in which the latch case in which the latch is housed is attached to the partition part, and the latch protrudes from the latch case. The state in which the latch is engaged with the receiving portion of the door frame is shown, (a) is a front view showing the locked state, and (b) is the unlocked and the engaging portion of the swing member. It is a front view which shows the state which retracted and disengaged from the engaging recess of a latch, and FIG. It is the bottom view of the latch lock which shows the posture of the latch when the door is opened. (A) is a front view showing a state in which the latch is pressed by the pressing member and protrudes from the state shown in FIG. 17, and further becomes irreversible, and (b) is a bottom view of (a). ) Is a bottom view showing a state in which the door is being closed in the state of (b). FIG. 18B is a bottom view showing a latch lock in a state where the push-pull handle is operated and the pressing member is retracted from the state shown in FIG. 18B, and FIG. 18A shows a state in which the protruding latch is in contact with the door frame. (B) shows a state in which the latch retracts into the latch case and the door is completely closed, and (c) shows a push-pull handle returned from the state of (b). , The pressing member presses the latch, and the engaging portion of the swinging member is engaged with the engaging recess of the latch.

Hereinafter, the outline of the latch lock 3 will be described with reference to the drawings, and subsequently, the detailed structure of the latch lock 3 will be described.
As shown in FIG. 1, the door 1 is provided with the latch lock 3 according to the embodiment of the present invention. The latch lock 3 is attached to the door 1 in the same manner as the conventional latch lock. FIG. 1 shows a state in which the door 1 is closed, and the latch 6 of the latch lock 3 protrudes from the door 1 and engages with the receiving portion 2a which is a recess on the door frame 2 side. When the door 1 opens, the latch 6 retracts into the door 1 and the latch 6 and the receiving portion 2a are disengaged.

As shown in FIG. 2, the latch lock 3 includes a lock box 5 (main body box), a latch unit 4 arranged in the lock box 5, a pressing member 8, a compression spring 9 (a urging member), and a swing member 65 (a swing member 65). It has a reversing prevention member), pressing pieces 71 and 72 (driving mechanism), a link mechanism portion 76, and a locking mechanism 19, and the lock box 5 is closed by the lid member 5a (FIG. 12) and the door 1 (FIG. 12). It is attached to 1).

As shown in FIGS. 2 and 12, the lock box 5 is provided with a partition portion 5b. The partition portion 5b is a member having a substantially U-shaped thin plate-like rigidity. The U-shaped open side of the partition portion 5b faces the protruding side, and a hole 50a (FIG. 12) through which the pressing member 8 described later is penetrated is provided in a portion extending in the vertical direction on the retracting side of the partition portion 5b. ing. Further, a long hole 50b (FIG. 12) through which the engaging portion 25 of the swing member 65, which will be described later, is inserted is provided in a portion extending in the horizontal direction on the lower surface side of the partition portion 5b. Further, a long hole 50c (FIG. 12) through which the engaging portion 21a of the lock member 21, which will be described later, is inserted is provided in a portion extending in the horizontal direction on the upper surface side of the partition portion 5b.

The partition portion 5b is a member that forms a region having a predetermined size for accommodating the latch unit 4 in the lock box 5. That is, the lock box 5, the lid member 5a, and the partition portion 5b block the latch unit 4 except for the protruding side portion. The protruding side of the latch unit 4 is open, but a retaining feature (not shown) is provided.

As shown in FIG. 15, the latch unit 4 has a latch 6 and a latch case 7 for accommodating the latch 6. That is, the latch case 7 containing the latch 6 is housed in the lock box 5 and fixed to the partition portion 5b. In addition, in FIGS. 2 to 6, for convenience, only a part of the latch case 7 is depicted.

As shown in FIG. 1, the latch 6 protrudes from the lock box 5 and fits into the receiving portion 2a (recess) of the door frame 2 when the door 1 is closed. When opening and closing the door 1, the latch 6 is operated by an operation handle (for example, a push-pull handle) of the door 1 (for example, a push-pull handle), which comes into contact with the door frame 2 and temporarily moves into and out of the lock box 5.

As shown in FIGS. 14A and 14B, the latch 6 has a structure in which a main body portion 6a made of resin and a rigid portion 6b made of a metal plate are integrated. That is, a part of the surface of the main body portion 6a that occupies most of the portion of the latch 6 is covered with the rigid portion 6b formed by press-molding a metal plate.

The latch 6 is an inverting latch, but the structure required for inverting is the same as that of the conventional one. On the front side (protruding side) of the latch 6, there is an opening contact portion 31a that contacts the door frame 2 when the door 1 is opened, and a closing contact portion 31b that contacts the door frame 2 when the door 1 is closed. Is provided. Both the open contact portion 31a and the closed contact portion 31b form a vertical plane, and both form an acute angle when viewed in a plan view.

As shown in FIG. 14A, a pressed portion 14 is provided on the back surface side (entry side) of the latch 6. The pressed portion 14 is a portion having a side surface portion 15, an upper surface portion 16, and a lower surface portion 17 and having a substantially U-shaped cross section, and is formed on the main body portion 6a. The side surface portion 15 constitutes a vertical wall (vertical wall), and the upper surface portion 16 and the lower surface portion 17 constitute a top surface wall and a bottom surface wall facing each other, respectively, and the top surface portion 16 and the bottom surface portion 17 form a ceiling. The surface and bottom surface are horizontal.

Further, an inclined surface portion 35a is formed on the upper surface portion 16, and an inclined surface portion 35b is formed on the lower surface portion 17. The inclined surface portions 35a and 35b are in the same plane, and when the latch 6 is viewed in a plan view, the inclined surface portions 35a and 35b overlap each other.

Further, an orthogonal surface portion 44a is formed on the upper surface portion 16. When the upper surface portion 16 is viewed in a plan view, the orthogonal surface portion 44a and the inclined surface portion 35a form an acute angle. Similarly, an orthogonal surface portion 44b is formed on the lower surface portion 17, and the orthogonal surface portion 44b and the inclined surface portion 35b form an acute angle. The orthogonal plane portions 44a and 44b are in the same plane.

As shown in FIG. 14A, the open contact portion 31a is a part of the main body portion 6a and is a portion slightly protruding from the rigid portion 6b. The open contact portion 31a has a vertical surface and intersects the inclined surface portions 35a and 35b which are the vertical surfaces on the exit side.

As shown in FIG. 14B, the closed contact portion 31b is also a part of the main body portion 6a that is not covered with the rigid portion 6b. The closed contact portion 31b intersects and is continuous with the orthogonal surface portions 44a and 44b. That is, when the latch 6 is viewed in a plan view or a bottom view, the open contact portion 31a, the closed contact portion 31b, the inclined surface portion 35a (35b), and the orthogonal surface portion 44a (44b) are located at the positions of the four sides of the rhombus.
The pressed portion 14 is a portion where the pressing member 8 described later is arranged.

Protruding portions 30 and 33 are provided on the upper portion of the latch 6. The protruding portions 30 and 33 are portions protruding in the height direction of the latch 6, and an engaging recess 34 is formed between the protruding portions 30 and 33. The engaging recess 34 is a recess extending along the advancing / retreating direction of the latch 6. Standing portions 32a and 32b are formed on the side of the protruding portions 30 and 33 on which the latch 6 projects. The upright portions 32a and 32b are wall surfaces formed in the same plane orthogonal to the projecting direction of the latch 6. A rigid portion 6b is engaged with the engaging recess 34, and the bottom surface of the engaging recess 34 is covered with the rigid portion 6b.

As shown in FIG. 14B, protrusions 36 and 37 forming an engaging recess 38 similar to the engaging recess 34 are also provided below the latch 6. The engaging recess 38 is also a recess extending in the direction in which the latch 6 advances and retreats, similar to the engaging recess 34. In addition, upright portions 40a and 40b are formed on the side where the latch 6 of the protruding portions 36 and 37 protrudes, and the bottom surface (top surface) of the engaging recess 38 is covered with the rigid portion 6b. The upright portions 40a and 40b of the protrusions 36 and 37 are in the same vertical plane as the upright portions 32a and 32b of the protrusions 30 and 33.

The opening contact portion 31a, the closing contact portion 31b, the inclined surface portions 35a, 35b, the orthogonal surface portions 44a, 44b, and the standing portions 32a, 32b, 40a, 40b of the latch 6 are provided on the resin main body portion 6a. There is. These are the parts that come into contact with the latch case 7 and the door frame 2.
By using the latch 6 upside down, it is possible to cope with the left-right difference of the door 1 and the specification change of the inward opening and the outward opening.

As shown in FIG. 13B, the latch case 7 has a main body portion 10 and a support portion 11.
The main body portion 10 is a hollow member having a rectangular parallelepiped shape having a substantially rectangular parallelepiped outer shape, and as shown in FIGS. 13 (b) and 13 (c), the side wall portions 26a and 26b constituting the side surfaces, It has a top wall portion 27 that constitutes an upper surface and a bottom wall portion 28 that constitutes a lower surface, and these have a continuous structure in the shape of a rectangular parallelepiped.
The main body 10 has a protruding side opening 7a (FIG. 13 (c)) and a retracting side opening 7b (FIG. 13 (b)). The protruding side opening 7a is provided with edges 39a and 39b. The edge 39a is a portion protruding toward the lower surface side of the top wall portion 27, and the edge 39b is a portion projecting toward the upper surface side of the bottom surface wall portion 28. Due to the edges 39a and 39b, the opening area of the protruding side opening 7a is slightly smaller than the cross-sectional area of the internal space of the main body 10.

As shown in FIG. 13B, a protruding engaging portion 12a is provided at the exit side end portion of the side wall portion 26a. The protruding engaging portion 12a is a portion where the central portion of the side wall portion 26a in the height direction of the retracting side end portion protrudes toward the retracting side. The protruding engaging portion 12a is provided with an engaging hole 13a.
The side wall portion 26b is also provided with a protruding engaging portion 12b having an engaging hole 13b similar to that of the side wall portion 26a. The protruding engaging portions 12a and 12b face each other, and the engaging holes 13a and 13b also face each other.
The top wall portion 27 is provided with an elongated hole 27a extending from the protruding side to the retracting side.
The bottom wall portion 28 is provided with an elongated hole 28a extending from the protruding side to the retracting side.

The support portion 11 is an annular member having a quadrangular outer shape, and is provided with an opening 11a inside. Insertion portions 24a and 24b are provided on both side portions of the support portion 11, respectively. Raised portions 25a and 25b are provided on the retreating side of the insertion portions 24a and 24b. The support portion 11 is arranged in the entrance side opening 7b of the main body portion 10, the insertion portion 24a is inserted into the engagement hole 13a, and the insertion portion 24b is inserted into the engagement hole 13b. The raised portions 25a and 25b are engaged with the engaging holes 13a and 13b, and function as a stopper for the insertion portions 24a and 24b.

A support portion 11 is attached to the main body portion 10 to form a latch case 7. The protruding side of the latch case 7 has a protruding side opening 7a, and the retracting side has an opening 11a of the support portion 11. The protruding side opening 7a and the opening 11a face each other.

As shown in FIG. 15, the latch 6 is arranged in the latch case 7. When the latch 6 is in the protruding posture, the upright portions 32a, 32b, 40a, 40b of the latch 6 shown in FIGS. 14 (a) and 14 (b) come into contact with the edges 39a, 39b of the latch case 7. As a result, the engaging recess 38 of the latch 6 becomes parallel to the elongated hole 28a of the latch case 7 and the elongated hole 50b of the partition portion 5b, and communicates with each other. At this time, the orthogonal surface portions 44a and 44b are in contact with the inner surface of the side wall portion 26b of the latch case 7.

When the latch 6 is inverted and the posture is changed, the upright portions 32a, 32b, 40a, 40b of the latch 6 are separated from the edges 39a, 39b of the latch case 7, and the inclined surface portions 35a, 35b are the side wall portions 26a of the latch case 7. Contact the inner surface of. When the latch 6 is inverted, the engaging recess 38 of the latch 6 is no longer parallel to the elongated hole 28a of the latch case 7 and the elongated hole 50b of the partition portion 5b.

Next, the locking mechanism 19 will be described.
The locking mechanism 19 has a structure similar to that of a conventional latch locking locking mechanism.
As shown in FIG. 2, the locking mechanism 19 includes a rotating member 20, a locking member 21, a spring 22, and the like.

The rotating member 20 is a member that rotates by being operated by an operating member (thumb turn or key) (not shown), and one end of a spring 22 that is a torsion spring is attached to a portion away from the center of rotation. The other end of the spring 22 is fixed to the lock box 5. The rotating member 20 is urged in one direction by the spring 22. The rotating member 20 is provided with pressing portions 20a and 20b extending in the radial direction. The pressing portions 20a and 20b form a predetermined angle (for example, 90 degrees).

The lock member 21 includes an engaging portion 21a that engages with the engaging recess 34 of the latch 6 and a pressed portion 21b. The lock member 21 is inserted through a rotating shaft portion 66a fixed to the lock box 5 shown in FIG. 12, and is rotatable about the rotating shaft portion 66a. The rotating shaft portion 66a is cantileveredly fixed to the lock box 5, and the free end side is screwed with a screw 66b penetrating the lid member 5a. That is, the lock member 21 is rotatably supported by the rotating shaft portion 66a whose both ends are supported by the lock box 5 and the lid member 5a. The pressed portion 21b is arranged between the pressing portions 20a and 20b of the rotating member 20.

When the rotating member 20 rotates, the lock member 21 rotates in conjunction with it. That is, when the locking mechanism 19 changes from the locked state shown in FIG. 2 to the unlocked state shown in FIG. 3, the rotating member 20 rotates counterclockwise, and the pressing portion 20a of the rotating member 20 is pressed. 21b is pressed to rotate (swing) the lock member 21. When the locking mechanism 19 changes from the unlocked state to the locked state, the rotating member 20 rotates clockwise, and the pressing portion 20b of the rotating member 20 presses the pressed portion 21b of the lock member 21 to lock. The member 21 is rotated (swinged).

The rotating member 20 rotates against the urging force of the spring 22, and the urging force of the spring 22 does not act at the two specific rotation positions and is stable. That is, the spring 22 has a function of giving moderation to the rotation of the rotating member 20, and is stable at two specific rotation positions. The two specific rotation positions are the rotation position (FIG. 2) when the engaging portion 21a of the lock member 21 comes to the locking position to engage with the latch 6, and the engagement recess 34 of the latch 6. It is a rotation position (FIG. 3) when it comes to the unlocking position.

The engaging portion 21a of the lock member 21 of the locking mechanism 19 penetrates the elongated hole 50c (FIG. 12) of the partition portion 5b and the elongated hole 27a (FIG. 13 (a)) of the latch case 7, and the engaging recess of the latch 6 When engaged with 34, the latch 6 can be locked by making it irreversible.
Further, when the rotating member 20 is rotated, the engaging portion 21a of the lock member 21 can be disengaged from the engaging recess 34 of the latch 6 so that the latch 6 can be inverted (unlocked state).

Next, the pressing member 8 will be described.
As shown in FIGS. 10 and 11, the pressing member 8 is a member having a rod-shaped elongated outer shape. One end of the pressing member 8 constitutes a tip portion 8a, the other end is provided with a rear end flange portion 56, and the rear end surface is provided with a bottomed rear end hole 8b. As shown in FIG. 11, the rear end hole 8b extends in the longitudinal direction of the pressing member 8 and becomes narrower (smaller diameter) as it approaches the bottom.

The tip end side of the compression spring 9 (urging member) is inserted into the rear end hole 8b of the pressing member 8. The compression spring 9 is a coil spring whose diameter is reduced toward the tip side. The rear end of the compression spring 9 is engaged with a protrusion 53 (FIG. 12) provided on the lock box 5. That is, the tip end side of the compression spring 9 is inserted into the rear end hole 8b of the pressing member 8, and the rear end side is engaged with the protrusion 53 of the lock box 5.

Further, guide engaging portions 57a and 57b are provided on the rear end flange 56 portion. The guide engaging portions 57a and 57b are provided at the upper end of the rear end flange portion 56.
Further, an intermediate flange portion 54 is provided at a portion in the middle of the pressing member 8. The intermediate flange portion 54 is provided with guide engaging portions 55a and 55b. The guide engaging portions 55a and 55b are provided below the intermediate flange portion 54.
That is, the guide engaging portions 57a and 57b of the rear end flange portion 56 are provided at positions higher than the guide engaging portions 55a and 55b of the intermediate flange portion 54.

The guide engaging portion 55a of the intermediate flange portion 54 is engaged with the guide groove 61a of the lid member 5a, and the guide engaging portion 55b is engaged with the guide groove 61b of the lock box 5. The guide grooves 61a and 61b face each other and extend in the direction in which the latch 6 advances and retreats.
The guide engaging portion 57a of the rear end flange portion 56 is engaged with the guide groove 62a of the lid member 5a, and the guide engaging portion 57b is engaged with the guide groove 62b of the lock box 5. The guide grooves 62a and 62b face each other and extend in the direction in which the latch 6 advances and retreats.
That is, in the pressing member 8, the intermediate flange portion 54 and the rear end flange portion 56 are supported by the lock box 5 and the lid member 5a. Further, the pressing member 8 can reciprocate in the direction in which the latch 6 moves back and forth.
As shown in FIG. 12, the guide grooves 62a and 62b are provided at positions higher than the guide grooves 61a and 61b.

Next, the swing member 65 (reversal prevention member) will be described.
As shown in FIGS. 7B and 10, the swinging member 65 has a swinging main body portion 75 having a substantially rectangular parallelepiped outer shape and a thin plate-shaped engaging portion 25 (latch engaging portion). .. The engaging portion 25 is mounted on the upper portion of the swing main body portion 75 on one end side (left end side when viewed in FIG. 7B). Further, a mounting portion 69 is provided at the lower portion on one end side, and the upper portion of the spiral coil-shaped spring 70 (FIG. 2) is attached to the mounting portion 69. The lower part of the spring 70 is in contact with the bottom surface of the lock box 5.

Further, as shown in FIG. 10, the swing body portion 75 is provided with a rotation shaft insertion hole 65a and a connecting member insertion hole 65b. A rotation shaft portion 41a (fixed rotation shaft on the reversing prevention member side) is inserted into the rotation shaft insertion hole 65a. The rotating shaft portion 41a is fixed to the lock box 5 as shown in FIG. The rotating shaft portion 41a has a screw hole for screwing with the screw 41b. The screw 41 penetrates the lid member 5a and is screwed into the screw hole of the rotating shaft portion 41a. That is, the swing body portion 75 of the swing member 65 is rotatably supported with respect to the lock box 5 via the rotation shaft portion 41a.

The connecting member insertion hole 65b is located at a position separated from the rotation shaft insertion hole 65a, and the connecting member 47 shown in FIG. 10 is inserted into the connecting member insertion hole 65b.
That is, the connecting member 47 inserted through the connecting member insertion hole 65b is located at a position separated from the axis of the rotating shaft portion 41a inserted through the rotating shaft insertion hole 65a. Therefore, the connecting member 47 can swing around the rotation shaft portion 41a.

The pressing pieces 71 and 72 (driving mechanism) shown in FIGS. 2 and 7B are elongated plate-shaped members that operate by operating a push-pull handle (not shown). That is, for example, the pressing piece 71 is connected to the push-side handle so as to be able to transmit power, and the pressing piece 72 is connected to the pull-side handle so as to be able to transmit power.

In FIG. 7B, the pressing pieces 71 and 72 are arranged so as to overlap in a direction orthogonal to the paper surface, and the pressing pieces 72 overlap with the pressing piece 71 and cannot be seen. That is, the pressing pieces 71 and 72 face each other with their tips facing each other. In FIG. 8B, since the pressing piece 71 has moved to the left, a part of the pressing piece 72 is visible.
The pressing piece 71 is inserted through a hole 52 provided in the lid member 5a, and the pressing piece 72 is inserted through a hole 51 provided in the lock box 5.

The pressing pieces 71 and 72 are arranged between the facing portion 67 of the swing main body portion 75 of the swing member 65, which will be described later, and the facing portion 68 of the link member 23. When the push-side handle is operated, the pressing piece 71 moves to the facing portion 67 side to press the facing portion 67, and the swing member 65 and the link member 23 can be rotated. Further, when the pull side handle is operated, the pressing piece 72 moves to the facing portion 68 side to press the facing portion 68, and the link member 23 and the swing main body portion 75 can be rotated.

Next, the link mechanism portion 76, which is a characteristic configuration of the present invention, will be described.
As shown in FIGS. 5 to 10, the link mechanism portion 76 has a link member 23 and a traction member 29. In FIGS. 5 and 6, the description of the locking mechanism 19 in the lock box 5 is omitted.

The link member 23 is a member having a substantially rectangular parallelepiped shape having a vertically long outer shape. As shown in FIG. 10, the link member 23 is provided with a rotating shaft insertion hole 23a and a connecting member insertion hole 23b.

Further, the link member 23 has a pair of arm portions 43a and 43b. Both arm portions 43a and 43b extend in parallel in a cantilever shape at predetermined intervals. A pressing member insertion region 46, which is a space through which the pressing member 8 described later can be inserted, is formed between the arm portions 43a and 43b. Support holes 45a and 45b are provided near the tips of the arm portions 43a and 43b, respectively.

Further, pressing member engaging portions 49a and 49b are formed on the retracting side of the latch 6 of the arm portions 43a and 43b. The pressing member engaging portions 49a and 49b are formed in the same surface, and are engaging surfaces on which the rear end flange portion 56 of the pressing member 8 abuts and engages.

A rotation shaft portion 42a (fixed rotation shaft on the link member side) is inserted into the rotation shaft insertion hole 23a. The rotating shaft portion 42a is fixed to the lock box 5 as shown in FIG. The rotating shaft portion 42a has a screw hole for screwing with the screw 42b. The screw 42 penetrates the lid member 5a and is screwed into the screw hole of the rotating shaft portion 42a. That is, the link member 23 is rotatably supported with respect to the lock box 5 via the rotation shaft portion 42a.

A connecting member 47 (connecting shaft) is inserted through the connecting member insertion hole 23b. That is, the connecting member 47 simultaneously inserts the connecting member insertion hole 65b of the swinging main body portion 75 of the swinging member 65 and the connecting member insertion hole 23b of the link member 23. In other words, the swing member 65 and the link member 23 are connected to each other via the connecting member 47 so as to be relatively rotatable.
The connecting member 47 inserted through the connecting member insertion hole 23b is located at a position separated from the axis of the rotating shaft portion 42a inserted through the rotating shaft insertion hole 23a. Therefore, the connecting member 47 can swing around the rotation shaft portion 42a.

Next, the traction member 29 will be described.
The traction member 29 has a substantially vertically long outer shape, and a pair of parallel arm portions 59a and 59b are provided on the lower side, and a shaft insertion portion 63 is provided on the upper side.
Pressing portions 60a and 60b are formed at the exit-side ends of the arm portions 59a and 59b. The pressing portions 60a and 60b are formed in the same plane.
The shaft insertion portion 63 forms an elongated hole 63a through which a shaft member 64 (FIG. 12) fixed to the lock box 5 is inserted.
Further, in the central portion of the traction member 29, engaging protrusions 58a and 58b (58b is not shown) that engage with the support holes 45a and 45b of the link member 23 are provided. That is, the engaging protrusions 58a and 58b are located between the lower arm portions 59a and 59b and the upper shaft insertion portion 63.

Further, the traction member 29 is supported by the lock box 5 via the shaft member 64. The elongated hole 63a of the towing member 29 is inclined so that the upper side is the protruding side of the latch 6 and the lower side is the retracting side of the latch 6.

Next, the relationship between the members will be described.
In the pressing member 8, the guide engaging portions 55a and 55b of the intermediate flange portion 54 are engaged with the guide grooves 61a and 61b on the lock box 5 side shown in FIG. 12, and the guide engaging portion 57a of the rear end flange portion 56. , 57b are engaged with the guide grooves 62a, 62b on the lock box 5 side shown in FIG. As a result, both the left and right sides of the pressing member 8 are supported by the lock box 5. Further, since the height positions of the guide engaging portions 55a and 55b and the guide engaging portions 57a and 57b are different, the support of the pressing member 8 to the lock box 5 side is extremely stable. That is, the pressing member 8 is stable in the horizontal posture, and the sliding movement of the latch 6 to the protruding side (protruding direction) and the retracting side (retracting direction) is also performed in the stable horizontal posture.

A part of the tip end side of the compression spring 9 is inserted into the rear end hole 8b of the pressing member 8, and the rear end side of the compression spring 9 is engaged with the protrusion 53 of the lock box 5. Therefore, when the pressing member 8 moves to the rear end side (the retracting side of the latch 6), the compression spring 9 is compressed and an urging force is generated. That is, the pressing member 8 is urged toward the protruding side (protruding direction) of the latch 6.

As shown in FIG. 2, the tip portion 8a of the pressing member 8 abuts on the side surface portion 15 of the pressed portion 14 of the latch 6 in the latch case 7 mounted on the partition portion 5b, and presses the latch 6 in the projecting direction. To do. That is, when the urging force of the compression spring 9 acts on the latch 6, the latch 6 protrudes from the lock box 5.

The swing member 65 is rotatably mounted on the rotation shaft portion 41a, and the lower end portion of the spring 70 (FIG. 2) attached to the mounting portion 69 is in contact with the bottom surface of the lock box 5. The spring 70 supports the swing member 65 by urging the swing member 65 (swing body portion 75) so as to raise the engaging portion 25. The spring 70 may be omitted.

The link member 23 is rotatably attached to the rotating shaft portion 42a. Further, a common connecting member 47 is inserted through the connecting member insertion hole 65b of the swing member 65 and the connecting member insertion hole 23b of the link member 23. That is, the swing member 65 and the link member 23 are connected to each other by a connecting member 47 so as to be relatively rotatable. Further, as shown in FIG. 2 and the like, the connecting member 47 is arranged between the rotating shaft portion 41a of the swing main body portion 75 of the swing member 65 and the rotating shaft portion 42a of the link member 23. FIG. 12 shows a state in which the connecting member 47 is arranged between the rotating shaft portions 41a and 42a fixed to the lock box 5. The connecting member 47 is not fixed to the lock box 5 and moves up and down.

As shown in FIG. 7B, the swing main body portion 75 and the link member 23 of the swing member 65 have facing portions 67 and 68, respectively, and the facing portions 67 and 68 face each other at intervals. doing. Between the facing portions 67 and 68, pressing pieces 71 and 72 interlocking with a push-pull handle (not shown) provided on the outward opening door 1 (FIG. 1) are arranged. The pressing piece 71 is a member that operates in conjunction with an operating member (push side handle) on the indoor side of the door 1, and the pressing piece 72 is interlocking with an operating member (pull side handle) on the outdoor side of the door 1. It is a working member.

In FIG. 7B, the pressing pieces 71 and 72 are arranged so as to overlap in the direction orthogonal to the paper surface, the pressing piece 71 is on the front side, and the pressing piece 72 overlaps with the pressing piece 71 and cannot be seen. .. Further, in FIG. 8B, since the pressing piece 71 has moved to the left, a part of the tip portion of the pressing piece 72 can be seen.

Since the pressing pieces 71 and 72 are arranged in this way, the distance from the pressing piece 71 to the rotating shaft portion 41a and the distance from the pressing piece 72 to the rotating shaft portion 42a are the same. Therefore, the moment around the rotating shaft portion 41a and the moment around the rotating shaft portion 42a are the same, and the magnitude of the force required to operate the push-pull handle from the indoor side and the outdoor side of the door 1 is the same. Become. That is, the magnitude of the force required to operate the pull-side handle and the push-side handle is the same.

A shaft member 64 fixed to the lock box 5 is inserted into the elongated hole 63a of the shaft insertion portion 63 of the towing member 29. Further, the traction member 29 is arranged between the arm portions 43a and 43b of the link member 23 (the pressing member insertion region 46 shown in FIG. 10), and the engaging protrusions 58a and 58b of the traction member 29 are the arm portions 43a. , 43b are fitted in the support holes 45a and 45b. That is, the traction member 29 and the link member 23 can rotate relative to each other around the engaging protrusions 58a and 58b.

Although the towing member 29 and the link member 23 can rotate relative to each other, the arm portions 59a and 59b of the towing member 29 are pressed at the rotation positions shown in FIGS. 5, 7 (a) and 7 (b). The portions 60a and 60b (FIG. 10) and the pressing member engaging portions 49a and 49b of the arm portions 43a and 43b of the link member 23 are arranged in the same plane.

Further, at the different rotation positions shown in FIGS. 6, 8 (a) and 8 (b), the pressing portions 60a and 60b (FIG. 10) of the arm portions 59a and 59b of the towing member 29 are the link member 23. The arm portions 43a and 43b of the above move to the retreat side (retreat direction) from the pressing member engaging portions 49a and 49b.

The pressing member 8 is between the arm portions 43a and 43b of the link member 23 (the pressing member insertion region 46 shown in FIG. 10), and is inserted between the arm portions 59a and 59b of the towing member 29.
Further, as shown in FIG. 7A, the rear end flange portion 56 of the pressing member 8 has the pressing member engaging portions 49a and 49b of the arm portions 43a and 43b and the pressing portions 60a and 60b of the arm portions 59a and 59b. It faces and is in contact with FIG. 10).

As shown in FIG. 5, the pressing member 8 is urged to the protruding side by a compression spring 9 (urging member), the tip portion 8a presses the side surface portion 15 of the latch 6, and the latch 6 presses the latch case 7. It is in contact with the edge 39 (FIG. 13 (c)) of the above.
Further, the engaging portion 25 of the swing member 65 penetrates the elongated hole 50b of the partition portion 5b shown in FIG. 15 and the elongated hole 28a of the latch case 7 and engages with the engaging recess 38 of the latch 6. ..
That is, the engaging portion 25 is raised by the urging force of the compression spring 9 and is engaged with the engaging recess 38 of the latch 6, and the spring 70 auxiliary urges the swing member 65 to assist the engaging portion 25. Is rising. The spring 70 also functions as a support member for supporting the swing member 65. The spring 70 may be omitted.

Next, the operation of the latch lock 3 will be described.
When the door 1 (FIG. 1) is closed, the latch 6 is fitted in the receiving portion 2a of the door frame 2 as shown in FIG. 16A. That is, the tip portion 8a of the pressing member 8 urged by the compression spring 9 presses the side surface portion 15 of the latch 6, the latch 6 protrudes from the latch case 7 (lock box 5, door 1), and receives the door frame 2. It invades and engages with the portion 2a.

When opening the outward opening door 1, the locking mechanism 19 (FIG. 2) is first unlocked.
When the door 1 is opened from the indoor side, a thumb turn (not shown) is operated to drive the locking mechanism 19, and as shown in FIG. 16B, the engaging portion 21a of the locking mechanism 19 is engaged with the latch 6 in the engaging recess. It is retracted from 34 and removed to unlock the latch 6.

When a person tries to go out of the room from the room, the link mechanism portion 76 is moved from the state shown in FIG. 7 (b) by operating the push side handle (not shown) on the indoor side of the door 1 that opens outward. The state changes to the state shown in FIG. 8 (b). That is, when a push-side handle (not shown) is operated, the pressing piece 71 (drive mechanism) interlocked with the push-side handle moves to the left and presses the facing portion 67 of the swing member 65, and the spring 70 (FIG. 2) and The swing member 65 rotates (swings) counterclockwise (arrow A) around the rotation shaft portion 41a against the urging force of the compression spring 9, and the engaging portion 25 is the engaging recess of the latch 6. It deviates from 38 and becomes the state shown in FIGS. 8 (b) and 16 (b). That is, the engaging portion 25 of the swing member 65 (reversing prevention member) moves in the direction indicated by the arrow A that intersects the protruding direction of the latch 6 (the direction from the retracting side to the protruding side), and the latch 6 is engaged. It comes off from the joint recess 38.

Further, when the swing member 65 rotates counterclockwise, as shown in FIG. 8B, the connecting member 47 moves upward as shown by an arrow C, and the link member 23 connected to the connecting member 47. Rotates clockwise around the rotation shaft portion 42a as shown by an arrow B. As a result, the support holes 45a and 45b of the link member 23 move to the retreat side (retreat direction) as shown by the arrow D, and the traction member engaged with the support holes 45a and 45b at the engaging protrusions 58a and 58b. 29 moves to the exit side. A shaft member 64 fixed to the lock box 5 is inserted into the elongated hole 63a of the shaft insertion portion 63 of the traction member 29, and the traction member 29 moves the elongated hole 63a along the shaft member 64 to the retracting side. Moving. At that time, the traction member 29 receives resistance from the shaft member 64, and the posture of the traction member 29 changes.

That is, while the towing member 29 moves to the retracting side, the posture of the towing member 29 changes from the state shown in FIG. 7 (b) to the state shown in FIG. 8 (b). Specifically, the traction member 29 rotates counterclockwise around the engaging protrusions 58a and 58b, and the arm portions 59a and 59b of the traction member 29 move to the retracting side. Therefore, the pressing portions 60a and 60b (FIG. 10) of the arm portions 59a and 59b press the rear end flange portion 56 of the pressing member 8 toward the retracting side, and retreat the pressing member 8 against the urging force of the compression spring 9. Tow to the entrance side. As a result, as shown in FIGS. 16B and 16C, the pressing member 8 moves to the retracting side, and the tip portion 8a of the pressing member 8 separates from the side surface portion 15 of the latch 6.
At this time, the latch 6 is not pressed to the protruding side and can be easily moved to the retracting side. Further, the latch 6 is in a state where it can be inverted.

When the door 1 is opened in this state, the opening contact portion 31a of the latch 6 comes into contact with the door frame 2, and as shown in FIG. 17, the latch 6 is easily inverted while the latch case 7 (lock box 5, door). 1) Get inside. That is, the latch 6 does not act as a resistance to the opening operation of the door 1, and moves into and out of the latch case 7 while changing its posture in contact with the door frame 2.

Here, the connecting member 47 is inserted into both the connecting member insertion hole 65b of the swinging member 65 and the connecting member insertion hole 23b of the link member 23 shown in FIG. 10, and the swinging member 65 is the rotating shaft portion 41a. The link member 23 rotates about the rotation shaft portion 42a. However, there is some clearance between the connecting member 47 and the connecting member insertion hole 65b, and between the connecting member 47 and the connecting member insertion hole 23b, and the swing member 65 and the link member 23 rotate within this clearance range. The connecting member 47 can move up and down.

The opening contact portion 31a is a portion formed on the resin main body portion 6a, and the impact when the latch 6 collides with the door frame 2 is alleviated, and collision noise is unlikely to occur. Further, when the latch 6 is inverted, the inclined surface portions 35a and 35b may collide with the inner surface of the side wall portion 26a of the latch case 7, but since the inclined surface portions 35a and 35b are also formed on the resin main body portion 6a. The impact of the collision is mitigated and the collision noise is less likely to occur.

When the operating member (push side handle) on the indoor side is released with the door 1 shown in FIG. 17 open, the state shown in FIGS. 6 and 8 (b) is changed to the state shown in FIGS. 5 and 7 (b). The pressing piece 71 returns to the original position and does not press the opposing portion 67 of the swing member 65, and the swing member 65 rotates clockwise due to the urging force of the compression spring 9 and the spring 70 shown in FIG. Return to the original posture.

That is, since the swing member 65 rotates clockwise, the connecting member 47 moves downward, the link member 23 rotates counterclockwise, and the traction member 29 moves to the protruding side. That is, the posture of the traction member 29 returns to its original position, and the arm portion 59a of the traction member 29 moves to the protruding side. As a result, the traction member 29 does not pull the rear end flange portion 56 of the pressing member 8 toward the retracting side (retracting direction), the pressing member 8 moves to the protruding side by the urging force of the compression spring 9, and the tip portion 8a Presses the side surface portion 15 of the latch 6. Therefore, the latch 6 protrudes from the latch case 7, the standing portions 32a, 32b, 40a, and 40b come into contact with the edges 39a, 39b of the latch case 7, and the latch 6 returns to its original posture. Since the standing portions 32a, 32b, 40a, and 40b are portions formed on the resin main body portion 6a, the collision sound at this time is alleviated.

Further, as shown in FIGS. 18A and 18B, the engaging portion 25 of the swinging member 65 is engaged with the engaging recess 38 of the latch 6 which has returned to the original posture, and the latch lock 3 The latch 6 becomes irreversible.
That is, the engaging portion 25 approaches and engages with the engaging recess 38 from the direction intersecting the protruding direction of the latch 6, and the latch 6 becomes irreversible.

When the door 1 is closed in the state shown in FIGS. 18A and 18B, the closed contact portion 31b of the latch 6 in the non-reversible state collides with the door frame 2. As shown in FIG. 18B, the closed contact portion 31b of the latch 6 which is not inverted is inclined with respect to the door frame 2. Therefore, when the door 1 is closed, as shown in FIG. 18C, the latch 6 slides the closing contact portion 31b with respect to the door frame 2 while sliding the door 1 (latch case 7, lock box). 5) Retreat within. Then, when the door 1 is closed and the latch 6 faces the receiving portion 2a of the door frame 2, the latch 6 is pressed by the pressing member 8 by the urging force of the compression spring 9 and protrudes as shown in FIG. 19C. It moves to the side and invades and engages with the receiving portion 2a.

When the latch 6 is moved to the retracting side and the protruding side, the engaging portion 25 is engaged with the engaging recess 38, but this engagement does not hinder the sliding movement of the latch 6. .. That is, the engagement between the engaging portion 25 and the engaging recess 38 prevents the latch 6 from reversing, and does not prevent the latch 6 from sliding to the retracting side or the protruding side.

In the closing operation of the door 1 at this time, as shown in FIG. 18C, the latch 6 temporarily retracts into the latch case 7, and further protrudes when the latch 6 faces the receiving portion 2a. The upright portions 32a, 32b, 40a, 40b of the latch 6 come into contact with the edges 39a, 39b of the latch case 7. Therefore, even if the standing portions 32a, 32b, 40a, and 40b are made of a resin material, a collision sound is generated. That is, even if the push-pull handle of the door 1 in the open state is released, the door 1 can be closed, but a collision noise is generated.

Therefore, the person who closes the door 1 operates a push-pull handle (not shown) to separate the pressing member 8 from the latch 6 as shown in FIG. 19 (a). When the door 1 is closed in this state, the latch 6 easily retracts into the latch case 7 and is in the state shown in FIG. 19B. Then, when the door 1 is closed and the latch 6 faces the receiving portion 2a of the door frame 2, the person who closes the door 1 operates the push-pull handle so that the latch 6 does not suddenly collide with the latch case 7. When the door 1 is operated in this way, the sound caused by the latch 6 is not generated.

The pressing member 8 moves to the protruding side (protruding direction) or the retracting side (retracting direction) of the latch 6 to press or release the latch 6. Further, the engaging portion 25 of the swing member 65 (reversing prevention member) advances and retreats in a direction intersecting the protruding direction of the latch 6 to engage with or disengage from the engaging recess 38 of the latch 6. That is, the advancing / retreating direction of the pressing member 8 and the advancing / retreating direction of the engaging portion 25 are different and intersect with each other. As a result, the engaging portion 25 engaged with the engaging recess 38 of the latch 6 can be disengaged regardless of the movement of the pressing member 8.

Since the engaging portion 25 of the swinging member 65 advances and retreats in the direction intersecting the protruding direction of the latch 6, the latch 6 does not move following the advancing and retreating of the engaging portion 25. That is, the swing member 65 has only a function of switching between a state in which the latch 6 can be reversed and a state in which the latch 6 cannot be reversed, and the posture of the latch 6 and the protruding direction (direction toward the protruding side or the retracting side). The position will not be changed carelessly.

In other words, the advancing / retreating operation of the pressing member 8 and the advancing / retreating operation of the engaging portion 25 are linked, but the advancing / retreating operation of the pressing member 8 does not hinder the advancing / retreating operation of the engaging portion 25. Further, the advancing / retreating operation of the engaging portion 25 does not hinder the advancing / retreating operation of the pressing member 8.

Specifically, the pressing member 8 and the engaging portion 25 both approach and press or engage with the latch 6. Further, both of them are separated from the latch 6. Here, when the pressing member 8 is disengaged from the latch 6, the disengagement of the engaging portion 25 and the latch 6 is not hindered, and conversely, when the engaging portion 25 is disengaged from the latch 6, the pressing member and the pressing member 6 are disengaged. The release of the latch is not prevented.

Therefore, it is possible to surely prevent the urging force of the compression spring 9 (the urging member) from acting on the latch 6 or the urging force of the compression spring 9 from acting on the latch 6 by the advancing / retreating operation of the pressing member 8. .. Further, by moving the engaging portion 25 forward and backward, the engaging portion 25 can be reliably engaged with the engaging recess 38 of the latch 6 and the engaging portion 25 can be reliably disengaged from the engaging recess 38 of the latch 6.

Therefore, the situation in which the latch 6 becomes irreversible and does not sufficiently move into the latch case 7 does not occur. That is, there is a situation in which a part of the latch 6 is fixed so as not to be inverted while protruding from the latch case 7, the latch 6 does not come out from the receiving portion 2a of the door frame 2, and the door 1 is locked with respect to the door frame 2. The door 1 can be opened and closed reliably without occurring.

If the method of operating the push-pull handle of the door 1 is devised, the latch 6 can be quickly moved to the protruding position and engaged with the receiving portion 2a without causing a collision sound between the latch 6 and the latch case 7. it can. That is, the push-pull handle is swiftly operated until just before the latch 6 (standing portions 32a, 32b, 40a, 40b) comes into contact with the latch case 7 (edges 39a, 39b), and the push-pull handle is operated immediately before they come into contact with each other. Operate slowly. By operating the push-pull handle in this way, it is possible to prevent the generation of collision noise and to promptly allow the latch 6 to enter the receiving portion 2a of the door frame 2 so that it cannot be reversed.

It is possible to prevent the latch 6 from colliding with the latch case 7 by adjusting the push-pull handle, and the latch 6 is slowly brought into contact with the latch case 7 to suppress the generation of collision noise. The engaging portion 25 of the swing member 65 can be quickly engaged with the engaging recess 38 of the latch 6 to make the latch 6 non-reversible.

If the door 1 is closed in the state shown in FIGS. 18A and 18B, the latch 6 in the non-reversible state collides with the door frame 2. Therefore, a person who goes out of the room to close the door 1 slowly closes the door 1 while pulling the pull-side handle on the outside of the room. A door closer (automatic closing device) (not shown) is provided on the door 1, and the door 1 is closed while pulling the pull side handle so that the closing speed of the door 1 is slowed down.

Further, when the door 1 is operated and opened from the outdoor side, when the pull side handle on the outdoor side is pulled, the pressing piece 72 linked with the pull side handle pushes the facing portion 68 of the link member 23 as shown in FIG. When pressed, the swing member 65 connected to the link member 23 rotates counterclockwise as indicated by the arrow A, and the engaging portion 25 disengages from the engaging recess 38 of the latch 6. Then, the pressing member 8 moves to the retracting side, the tip portion 8a of the pressing member 8 is separated from the side surface portion 15 of the latch 6, and the latch lock 3 is in the state shown in FIG. 16 (c).

The latch 6 shown in FIG. 16C is not fixed and can be inverted. When the door 1 is opened and the latch 6 collides with the door frame 2, the latch 6 is easily inverted as shown in FIG. While entering the latch case 7.
Then, the person who operates the door 1 enters the room from the outside, releases the hand from the pull side handle on the outside, operates the push side handle on the indoor side before the door 1 is completely closed, and slowly moves the push side handle. When the door 8 is returned to the original position, the pressing member 8 slowly moves toward the protruding side, and the tip portion 8a presses the latch 6. As a result, the latch 6 slowly comes into contact with the latch case 7, and the engaging portion 25 of the swinging member 65 engages with the engaging recess 38 of the latch 6, resulting in the state shown in FIG. 19 (c). That is, the latch 6 engages with the receiving portion 2a of the door frame 2, and the latch 6 is in an irreversible state.

As described above, the latch lock 3 operates in the same manner regardless of whether the door 1 is opened from the indoor side or the outdoor side.
That is, the only difference is whether to operate the push side handle on the indoor side or the pull side handle on the outdoor side first, and the latch lock 3 can be operated from either the indoor side or the outdoor side of the door 1. It works in the same way.

Further, when the push side handle and the pull side handle are operated at the same time, the pressing piece 71 moves to the left to press the facing portion 67 of the swing member 65, and the pressing piece 72 moves to the right to move the link member 23. Press the opposing portion 68 of. Therefore, even if both handles are temporarily operated when going out from the room to the outside and when entering the room from the outside, and then the hand is released from one of the handles, the latch 6 continues to be in a reversible state. , As shown in FIGS. 18A and 18B, the state of being retracted into the latch case 7 shown in FIG. 17 can be maintained without protruding. Therefore, it is possible to satisfactorily suppress the generation of sound caused by the latch lock 3 when the door 1 is opened and closed.

In the above-described embodiment, the link member 23 and the traction member 29 are provided in the link mechanism portion 76, and the traction member 29 pulls the pressing member 8 in the retracting direction. However, the traction member 29 may be omitted. it can. That is, the towing member 29 can be omitted, and the rear end flange portion 56 of the pressing member 8 can be towed to the retracting side by the pair of arm portions 43a and 43b of the link member 23 shown in FIG. 7B. Specifically, the pair of arm portions 43a and 43b of the link member 23
The portion indicated by reference numeral 73 is used as a support portion. The distance between the pair of arm portions 43a and 43b is set so that the pressing member 8 can be just placed between the two arm portions 43a and 43b, and the rear end flange portion 56 abuts on the end surface of the support portion 73 on the retracting side. Let me. When a push-side handle or a pull-side handle (not shown) provided on the door 1 is operated and the pressing piece 71 or 72 presses the facing portion 67 of the swing member 65 or the facing portion 68 of the link member 23, the swing member 65 is pressed. The engaging portion 25 rotates counterclockwise around the rotating shaft portion 41a, the engaging portion 25 disengages from the engaging recess 38 of the latch 6, and the link member 23 rotates clockwise around the rotating shaft portion 42a. , The support portion 73 moves to the entry / exit side. Therefore, the pressing member 8 is pulled toward the retracting side, and the tip portion 8a of the pressing member 8 is separated from the side surface portion 15 of the latch 6.
That is, in this case, the link member 23 functions as a traction member.
The rotation angle of the link member 23 is secured so that the link member 23 can sufficiently pull the pressing member 8 toward the retracting side.

1 Door 3 Latch lock 5 Lock box (main body box)
6 Latch 8 Pressing member 9 Compression spring (urging member)
23 Link member 25 Engagement part (latch engagement part)
41a Rotating shaft of swinging member (fixed rotating shaft on the reversing prevention member side)
42a Link member rotation shaft (link member side fixed rotation shaft)
47 Connecting member (connecting shaft)
65 Swing member (reversal prevention member)
71, 72 Pressing piece (drive mechanism)
76 Link mechanism

Claims (2)

In a latch lock combined with a push-pull handle, which has a reversible latch in the main body box and is in a state where reversal of the latch is allowed by operating the push-pull handle.
A pressing member that presses the latch in the protruding direction from the main body box,
An urging member that urges the pressing member in the protruding direction,
It has a reversing prevention member that engages with the latch and prevents the latch from reversing.
The latch has an engaging recess extending along the direction of advancement and retreat of the latch.
The reversal prevention member has a thin plate-shaped engaging portion and has a thin plate-like engaging portion.
The engaging portion of the reverse rotation preventing member moves forward and backward in a direction intersecting the protruding direction of the latch to engage and disengage from the engaging recess of the latch.
It has a drive mechanism that operates by operating the push-pull handle,
The drive mechanism directly or indirectly engages with the pressing member and the reversing preventing member to cause the pressing member and the reversing preventing member to cooperate with each other.
A latch lock characterized in that an operation of moving the pressing member in the retracting direction by the drive mechanism and an operation of disengaging the reversing prevention member and the latch are executed in combination. In a latch lock combined with a push-pull handle, which has a reversible latch in the main body box and is in a state where reversal of the latch is allowed by operating the push-pull handle.
A pressing member that presses the latch in the protruding direction from the main body box,
An urging member that urges the pressing member in the protruding direction,
It has a reversing prevention member that engages with the latch and prevents the latch from reversing.
The reversing prevention member moves forward and backward in a direction intersecting the protruding direction of the latch to engage with and disengage from the latch.
It has a drive mechanism that operates by operating the push-pull handle,
The drive mechanism directly or indirectly engages with the pressing member and the reversing preventing member to cause the pressing member and the reversing preventing member to cooperate with each other.
The operation of moving the pressing member in the retracting direction by the drive mechanism and the operation of disengaging the reversing prevention member and the latch are executed in combination.
It has a link mechanism that engages with the pressing member to operate the pressing member.
The link mechanism portion has a link member, and the link member swings around a fixed rotation shaft on the link member side fixed to the main body box.
The reversing prevention member has a swing main body portion and a latch engaging portion that engages with a latch, and swings around a reversing prevention member side fixed rotation shaft fixed to the main body box. ,
The link member and the swing main body are engaged with each other via a connecting shaft.
The drive mechanism engages with the swing body or the link member of the reversal prevention member,
The link member swings around the link member side fixed rotation shaft in conjunction with the swing main body swinging around the reverse rotation prevention member side fixed rotation shaft, or
In conjunction with the link member swings around the link member side fixed pivot shaft, characterized in that the oscillating body part swings around the inversion preventing member side fixed pivot axis and to Lula pitch Lock.

Images