JP2018141340A - Latch lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a latch lock capable of attenuating a sound when an inverted latch is returned and also of rapidly returning the inverted latch when a door is closed.SOLUTION: A latch lock comprises: a pressing member 8 for pressing a latch 6 out of a lock box 5 in a projection direction; a biased member 9 for biasing the pressing member 8 to the projection direction; and an invert-prevention member 65 for preventing the latch 6 from inverting by engaging the latch 6. The invert-prevention member 65 engages and detaches the latch 6 by moving in a longitudinal direction intersecting the projection direction of the latch 6, and has a drive mechanism actuated by operation of a push handle. The drive mechanism is configured to actuate the pressing member 8 and the invert-prevention member 65 so as to cooperatively move by directly or indirectly engaging the pressing member 8 and the invert-prevention member 65. A movement of the pressing member 8 in an exit-entering direction and a movement of detaching the invert-prevention member 65 from the latch 6 by the drive mechanism are cooperatively performed.SELECTED DRAWING: Figure 4

Description

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

When the door opens and closes, a clicking sound is generated due to retraction into the door (inside the lock box) and the return of the latch to its original position.
This sound is annoying in quiet environments such as hospitals and libraries, and improvement has been desired. Patent Documents 1 and 2 disclose a configuration for slowing the moving speed when the latch protrudes from the lock box and making it difficult to generate sound.

Japanese Patent No. 3710104 Japanese Patent No. 5659436

By the way, the conventional silencer like patent documents 1 and 2 makes the moving speed of the latch slow, and fine adjustment of the positional relationship between members for suppressing the moving speed of the latch and the moving speed of the latch Adjustment work is necessary to adjust the amount appropriately. Further, in the conventional silencer, the return to the original position of the latch needs to elapse in a preset time and cannot be quickly returned. Therefore, it takes time until the latch functions as a latch after the door is closed.
That is, in the configuration of the prior art, it is impossible to achieve both suppression of sound generated when the latch returns to the original position and prompt return of 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 described in claim 1 for solving the above problem is a latch lock combined with a push-pull handle, and has a reversible latch in the main body box, and by operating the push-pull handle, In the latch lock in which the inversion of the latch is allowed, the pressing member that presses the latch in the protruding direction from the main body box, the biasing member that biases the pressing member in the protruding direction, and the latch are engaged. A reversal preventing member that prevents reversal of the latch, and the reversal preventing member moves forward and backward in a direction crossing the protruding direction of the latch to engage and disengage the latch, and operates a push-pull handle; A drive mechanism that operates according to the above, and the drive mechanism engages the pressing member and the reverse blocking member directly or indirectly to connect the pressing member and the reverse blocking member. 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 releasing the engagement between the reverse blocking member and the latch are executed in conjunction with each other. is there.

In the first aspect of the invention, since the pressing member that presses the latch in the protruding direction from the main body box and the biasing member that presses the pressing member in the protruding direction, the latch is pressed in the protruding direction and protrudes from the door. Yes.
Further, since the reversal prevention member that engages with the latch and prevents the reversal of the latch is provided, the reversal of the latch when the door is closed is prevented.
Furthermore, since the reverse blocking member moves forward and backward in the direction intersecting the protruding direction of the latch and engages / disengages from the latch, the reverse blocking member is released from the latch to release the engagement with the latch, The latch can be made invertible.
At this time, since the reversal prevention member advances and retreats in a direction intersecting with the protruding direction of the latch, the latch does not follow the advance and retreat of the reversal prevention member. That is, the reversal prevention member has only a function of switching between a state where the latch can be reversed and a state where the latch cannot be reversed, and the posture and position of the latch are not changed carelessly.
Furthermore, it has a drive mechanism that operates by operating the push-pull handle, and the drive mechanism engages the pressing member and the reverse blocking member directly or indirectly to link the pressing member and the reverse blocking member. The operation of moving the pressing member in the retracting direction by the drive mechanism and the operation of releasing the engagement between the reverse blocking member and the latch are executed in cooperation.
Therefore, when the latch is in a reversible state, the latch is not pressed by the pressing member. When the door is rotated by the door opening operation, the latch can move in the retracting direction while being in contact with the door frame and being inverted. That is, at this time, the latch receives an external force only from the door frame side, and the attitude and position of the latch are changed, but the collision noise between the latch and the door frame hardly occurs.
Further, by operating the push-pull handle, the pressing member moves to the protruding side and approaches the latch, and the latch is pressed and moved to the protruding position. At the same time, the reversal prevention member approaches and engages the latch, and the latch becomes non-reversible. At this time, if the push-pull handle is operated slowly, it is difficult to produce a sound due to the return of the latch to the original protruding position.

  The invention according to claim 2 includes a link mechanism portion that engages with the pressing member to operate the pressing member, the link mechanism portion includes a link member, and the link member is fixed to the main body box. The reversing prevention member has a swinging main body part and a latch engaging part that engages with a latch, and is fixed to the main body box. The link member and the swinging main body are engaged via a connecting shaft, and the drive mechanism is a swinging main body of the reverse blocking member. The link member swings about the link member side fixed rotation axis in conjunction with the swinging main body unit swinging about the reverse rotation prevention member side fixed rotation axis. Or the link member swings around the link member side fixed rotation axis. In conjunction to a latch lock according to claim 1, the swing body unit is characterized in that swings about a reversal preventing member side fixed pivot shaft.

The invention according to claim 2 includes a link mechanism portion that engages with the pressing member to operate the pressing member, the link mechanism portion includes the link member, and the link member is fixed to the main body box. The reversal prevention member has a swinging main body part and a latch engagement part that engages with the latch, and is fixed to the reversal prevention member side fixed to the main body box. The link member and the swinging main body are engaged via a connecting shaft.
That is, the link mechanism portion having the link member and the reverse blocking member having the swinging main body portion are engaged via the connecting shaft, and the link mechanism portion and the reverse blocking member operate in a linked manner.
The link mechanism is linked to the link mechanism in conjunction with the drive mechanism engaging with the swinging main body portion or the link member of the reverse blocking member and swinging about the reverse rotation preventing member side fixed rotation shaft. Swing around the member-side fixed rotation axis, or in conjunction with the link member swinging around the link-member-side fixed rotation axis, the rocking body part is fixed and rotated on the reverse-inhibiting member side. It swings around the axis.

The latch lock of the present invention can reduce the sound 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 achieve both suppression of sound generated when the latch returns to the original position and prompt return of the latch to the original position.

It is a front view of the latch lock concerning the embodiment of the present invention, and shows the state where 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 of a locked state. It is a front view which shows the internal structure of the latch lock of FIG. 1 of an unlocked state. It is a front view which shows the internal structure of the latch lock in which the push pull handle was operated in FIG. FIG. 4 is a front view of the internal structure of the unlocked latch shown in FIG. 3 excluding the locking mechanism. FIG. 5 is a front view of the internal structure of the latch lock shown in FIG. 4 excluding the locking mechanism. (A) is a principal part of a latch lock, Comprising: It is a perspective view which shows the state in which the inversion of a latch is prevented, (b) is a front view of (a). (A) is a principal part of a latch lock, Comprising: It is a perspective view which shows the state which can invert a latch, (b) is a front view of (a). FIG. 9 is a front view of the main part of the latch lock in which the latch can be reversed by an operation different from that of FIG. It is a disassembled perspective view of the principal part of a latch lock. It is a cross-sectional perspective view of the pressing member and compression spring of FIG. It is a perspective view of the lock box of the latch lock of FIG. (A) is the perspective view seen from the retreat side upper side of a latch case, (b) is the exploded perspective view of (a), (c) is the perspective view seen from the protrusion side lower side of the latch case. . (A) is the perspective view seen from the retracting side upper part of a latch, (b) is the perspective view seen from the protrusion side of the latch. It is a perspective view which shows the state which the latch case in which the latch was accommodated is mounted | worn with the partition part, and the latch protruded from the latch case. The latch is engaged with the receiving part of the door frame, (a) is a front view showing the locked state, (b) is the unlocked and the engaging part of the swing member It is a front view which shows the state which retracted and removed from the engagement recessed part of the latch, (c) is a bottom view of (b). It is a bottom view of the latch lock | rock which shows the attitude | position of a latch when a door opens. (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 cannot be reversed, and (b) is a bottom view of (a). ) Is a bottom view showing a state in the middle of closing the door in the state of (b). FIG. 19 is a bottom view showing the latch lock in a state in which the push-pull handle is operated and the pressing member is retracted from the state shown in FIG. 18B, and FIG. 19A shows a state in which the protruding latch is in contact with the door frame. (B) shows a state in which the latch is retracted into the latch case and the door is completely closed, and (c) shows that the push-pull handle is 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 then the detailed structure of the latch lock 3 will be described.
As shown in FIG. 1, the door 1 is provided with a latch 3 according to an embodiment of the present invention. The latch lock 3 is attached to the door 1 like a 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 a receiving portion 2a that 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 disposed in the lock box 5, a pressing member 8, a compression spring 9 (biasing member), and a swinging member 65 ( Reversal prevention member), pressing pieces 71 and 72 (drive mechanism), link mechanism portion 76, and locking mechanism 19, and the lock box 5 is closed by the lid member 5a (FIG. 12) and the door 1 (FIG. 1) is installed.

  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 shape. An opening 50a (FIG. 12) through which a later-described pressing member 8 passes is provided in a portion extending in the vertical direction on the retracting side of the partition portion 5b, with the U-shaped open side of the partition portion 5b facing the protruding side. ing. Further, a long hole 50b (FIG. 12) through which an engaging portion 25 of a swinging member 65 described later is inserted is provided in a portion extending in the horizontal direction on the lower surface side of the partition portion 5b. Furthermore, an elongated hole 50c (FIG. 12) through which an engaging portion 21a of a lock member 21 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 5 b is a member that forms a region of a predetermined size that accommodates the latch unit 4 in the lock box 5. That is, the lock unit 5, the lid member 5 a, and the partition portion 5 b close the other side than the protruding side of the latch unit 4. The side of the protruding side of the latch unit 4 is open, but is provided with a stopper (not shown).

  As shown in FIG. 15, the latch unit 4 includes a latch 6 and a latch case 7 that accommodates the latch 6. That is, the latch case 7 that houses the latch 6 is housed in the lock box 5 and fixed to the partition portion 5b. 2 to 6, only a part of the latch case 7 is depicted for convenience.

  As shown in FIG. 1, the latch 6 protrudes from the lock box 5 and fits into the receiving portion 2 a (concave portion) of the door frame 2 when the door 1 is closed. When the door 1 is opened and closed, an operation handle (for example, a push-pull handle) (not shown) of the door 1 is operated, and the latch 6 comes into contact with the door frame 2 and temporarily retracts into the lock box 5.

  As shown in FIGS. 14 (a) and 14 (b), 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 occupying most of the portion of the latch 6 is covered with a rigid portion 6b configured by press-molding a metal plate.

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

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

  In addition, an inclined surface portion 35 a is formed on the upper surface portion 16, and an inclined surface portion 35 b 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 plan, the inclined surface portions 35a and 35b overlap.

  Further, an orthogonal surface portion 44 a is formed on the upper surface portion 16. When the upper surface portion 16 is viewed in plan, 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 surface portions 44a and 44b are in the same plane.

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

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

  Protrusions 30 and 33 are provided on the upper portion of the latch 6. The projecting portions 30 and 33 are portions projecting in the height direction of the latch 6, and an engaging recess 34 is formed between the projecting portions 30 and 33. The engagement recess 34 is a recess extending along the direction in which the latch 6 advances and retreats. Standing portions 32 a and 32 b are formed on the protruding portions 30 and 33 on the side where the latch 6 protrudes. The standing portions 32 a and 32 b are wall surfaces formed in the same plane orthogonal to the protruding direction of the latch 6. The engaging recess 34 is engaged with the rigid portion 6b, 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 that constitute an engaging recess 38 similar to the engaging recess 34 are also provided at the lower portion of the latch 6. Similar to the engagement recess 34, the engagement recess 38 is a recess extending along the direction in which the latch 6 advances and retreats. Further, standing portions 40a and 40b are formed on the side of the protruding portions 36 and 37 from which the latch 6 protrudes, and the bottom surface (top surface) of the engaging recess 38 is covered with the rigid portion 6b. The standing portions 40 a and 40 b of the projecting portions 36 and 37 are in the same vertical plane as the standing portions 32 a and 32 b of the projecting portions 30 and 33.

The opening contact portion 31a, the closing contact portion 31b, the inclined surface portions 35a and 35b, the orthogonal surface portions 44a and 44b, and the standing portions 32a, 32b, 40a, and 40b of the latch 6 are provided on the resin main body portion 6a. Yes. These are 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 a difference in right and left of the door 1 and changes in specifications of the inner opening and the outer 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 tube shape whose outer shape is substantially a rectangular parallelepiped shape, and as shown in FIGS. 13B and 13C, side wall portions 26a and 26b constituting side surfaces, It has a top wall portion 27 that constitutes the upper surface and a bottom wall portion 28 that constitutes the lower surface, and these have a continuous structure in the form of a square cylinder.
The main body 10 has a protruding side opening 7a (FIG. 13C) and a retracting side opening 7b (FIG. 13B). Edges 39a and 39b are provided in the protruding side opening 7a. The edge 39 a is a part protruding to the lower surface side of the top wall part 27, and the edge 39 b is a part protruding to the upper surface side of the bottom wall part 28. Due to the edges 39 a and 39 b, the opening area of the projecting side opening 7 a is slightly smaller than the transverse area of the internal space of the main body 10.

As shown in FIG. 13B, a projecting engagement portion 12a is provided at the retreat side end of the side wall portion 26a. The projecting engagement portion 12a is a portion where the central portion in the height direction of the retreat side end of the side wall portion 26a projects to the retreat side. An engagement hole 13a is provided in the protruding engagement portion 12a.
The side wall portion 26b is also provided with a protruding engagement portion 12b having an engagement hole 13b similar to the side wall portion 26a. The projecting engagement portions 12a and 12b are opposed to each other, and the engagement holes 13a and 13b are also opposed to each other.
The top wall 27 is provided with a long hole 27a extending from the protruding side to the retracting side.
The bottom wall 28 is provided with a long hole 28a extending from the protruding side to the retracting side.

  The support part 11 is an annular member having a rectangular outer shape, and an opening 11a is provided inside. Insert portions 24a and 24b are provided on both side portions of the support portion 11, respectively. Raised portions 25a and 25b are provided at the retreat side portions of the insertion portions 24a and 24b. The support portion 11 is disposed in the retraction 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 engagement holes 13a and 13b, and function as retaining portions for the insertion portions 24a and 24b.

  A support case 11 is mounted on the main body 10 to constitute a latch case 7. The latch case 7 has a projecting side opening 7a on the projecting side, and an opening 11a of the support portion 11 on the retracting side. The protrusion side opening 7a and the opening 11a face each other.

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

  When the latch 6 is reversed to change the posture, the rising 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. Abuts against the inner surface. When the latch 6 is inverted, the engagement recess 38 of the latch 6 is not parallel to the long hole 28a of the latch case 7 and the long hole 50b of the partition part 5b.

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

  The rotation member 20 is a member that is rotated by an operation member (a thumb turn or a key) (not shown), and one end of a spring 22 that is a torsion spring is attached to a portion away from the rotation center. The other end of the spring 22 is fixed to the lock box 5. The rotating member 20 is biased in one direction by a 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 engagement portion 21 a that engages with the engagement recess 34 of the latch 6 and a pressed portion 21 b. The lock member 21 is inserted into a rotation shaft portion 66a fixed to the lock box 5 shown in FIG. 12, and is rotatable about the rotation shaft portion 66a. The rotating shaft portion 66a is fixed to the lock box 5 in a cantilevered manner, 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 rotation shaft portion 66a whose both ends are supported by the lock box 5 and the lid member 5a. The pressed portion 21 b is disposed between the pressing portions 20 a and 20 b 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 and the lock member 21 is rotated (swinged). 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 locking member 21 to lock it. 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 two specific rotating positions and is stable. In other words, the spring 22 has a function of giving moderation to the rotation of the rotation member 20 and is stable at two specific rotation positions. The two specific rotation positions are a rotation position when the engaging portion 21a of the lock member 21 comes to a locking position for engaging the latch 6 (FIG. 2), and a distance from the engaging recess 34 of the latch 6. It is a rotation position (FIG. 3) when it comes to the unlocking position to perform.

The engaging part 21a of the locking member 21 of the locking mechanism 19 passes through the long hole 50c (FIG. 12) of the partition part 5b and the long hole 27a (FIG. 13 (a)) of the latch case 7 to engage with the engaging recess of the latch 6. When engaged with the lever 34, the latch 6 can be made non-invertable and locked.
Further, when the rotating member 20 is rotated, the engaging portion 21a of the lock member 21 can be detached from the engaging recess 34 of the latch 6, and the latch 6 can be brought into a reversible state (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-like elongated outer shape. One end of the pressing member 8 constitutes a front end portion 8a, a rear end flange portion 56 is provided at the other end, and a bottomed rear end hole 8b is provided at the rear end surface. 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 distal end side of the compression spring 9 (biasing 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 distal end side. The end of the compression spring 9 on the rear end side is engaged with a protrusion 53 (FIG. 12) provided on the lock box 5. That is, the front end side of the compression spring 9 is inserted into the rear end hole 8 b of the pressing member 8, and the rear end side is engaged with the protruding portion 53 of the lock box 5.

Further, guide engaging portions 57a and 57b are provided at the rear end flange 56 portion. The guide engaging portions 57 a and 57 b are provided at the upper end of the rear end flange portion 56.
Further, an intermediate flange portion 54 is provided in the middle of the pressing member 8. The intermediate flange portion 54 is provided with guide engagement 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 57 a and 57 b of the rear end flange portion 56 are provided at positions higher than the guide engaging portions 55 a and 55 b 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 57 a of the rear end flange portion 56 is engaged with the guide groove 62 a of the lid member 5 a, and the guide engaging portion 57 b is engaged with the guide groove 62 b 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. The pressing member 8 can reciprocate in the direction in which the latch 6 advances and retreats.
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 (inversion prevention member) will be described.
As shown in FIGS. 7B and 10, the swing member 65 includes a swing main body 75 having a substantially rectangular parallelepiped outer shape and a thin plate-like engagement portion 25 (latch engagement portion). . The engaging part 25 is attached to the upper part of one end side of the swinging body part 75 (left end side as viewed in FIG. 7B). Further, an attachment portion 69 is provided at the lower portion on one end side, and an upper portion of a spiral coil spring 70 (FIG. 2) is attached to the attachment 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 swinging main body 75 is provided with a rotation shaft insertion hole 65a and a connecting member insertion hole 65b. A rotation shaft portion 41a (inversion blocking member side fixed rotation shaft) is inserted through the rotation shaft insertion hole 65a. The rotating shaft portion 41a is fixed to the lock box 5 as shown in FIG. The rotation shaft portion 41a has a screw hole that is screwed with the screw 41b. The screw 41 passes through the lid member 5a and is screwed into the screw hole of the rotation shaft portion 41a. That is, the swinging main body 75 of the swinging member 65 is supported so as to be rotatable with respect to the lock box 5 via the rotating shaft 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 away from the axis of the rotation shaft portion 41a inserted through the rotation shaft insertion hole 65a. Therefore, the connecting member 47 can swing around the rotation shaft portion 41a.

  The pressing pieces 71 and 72 (drive mechanism) shown in FIG. 2 and FIG. 7B are elongated plate-like 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.

The pressing pieces 71 and 72 are arranged so as to overlap in the direction orthogonal to the paper surface in FIG. 7B, and the pressing pieces 72 overlap the pressing pieces 71 and cannot be seen. That is, the pressing pieces 71 and 72 are opposed to each other in a state where the tips are in contact with 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 5 a, and the pressing piece 72 is inserted through a hole 51 provided in the lock box 5.

  The pressing pieces 71 and 72 are disposed between a facing portion 67 of a swinging main body 75 of the swinging member 65 described later and a 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, presses 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, presses the facing portion 68, and the link member 23 and the swinging main body portion 75 can be rotated.

Next, the link mechanism part 76 which is a characteristic configuration of the present invention will be described.
The link mechanism section 76 includes a link member 23 and a pulling member 29 as shown in FIGS. 5 and 6, the depiction of the locking mechanism 19 in the lock box 5 is omitted.

  The link member 23 is a member having an approximately rectangular parallelepiped shape whose outer shape is vertically long. 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.

  Moreover, the link member 23 has a pair of arm parts 43a and 43b. Both arm portions 43a and 43b extend in a cantilevered manner at a predetermined interval. Between both arm parts 43a and 43b, the press member insertion area | region 46 which is the space which can insert the below-mentioned press member 8 is formed. Support holes 45a and 45b are provided near the ends of the arm portions 43a and 43b, respectively.

  Also, 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 on the same plane, and are engaging surfaces with which the rear end flange portion 56 of the pressing member 8 comes into contact and engages.

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

A connection member 47 (connection shaft) is inserted through the connection member insertion hole 23b. That is, the connecting member 47 is inserted through the connecting member insertion hole 65b of the swinging main body 75 of the swinging member 65 and the connecting member insertion hole 23b of the link member 23 simultaneously. 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 at a position away 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 pulling member 29 will be described.
The pulling member 29 has a substantially vertically long outer shape, a pair of parallel extending arm portions 59a and 59b is 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 retracting end portions of the arm portions 59a and 59b. The pressing parts 60a and 60b are formed in the same plane.
The shaft insertion part 63 forms a long hole 63 a through which the shaft member 64 (FIG. 12) fixed to the lock box 5 is inserted.
Furthermore, engaging projections 58a and 58b (58b not shown) that engage with the support holes 45a and 45b of the link member 23 are provided at the central portion of the pulling member 29. 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.

  The pulling member 29 is supported by the lock box 5 via the shaft member 64. The elongated hole 63 a of the pulling 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 55 a and 55 b of the intermediate flange portion 54 are engaged with the guide grooves 61 a and 61 b on the lock box 5 side shown in FIG. 12, and the guide engaging portion 57 a of the rear end flange portion 56. 57b are engaged with guide grooves 62a and 62b on the lock box 5 side shown in FIG. Thereby, 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 on the lock box 5 side is extremely stable. That is, the pressing member 8 is stable in a horizontal posture, and sliding movement of the latch 6 to the protruding side (projecting direction) and the retracting side (retracting direction) is also performed in a stable horizontal posture.

  A part of the front end side of the compression spring 9 is inserted into the rear end hole 8 b 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 (retraction side of the latch 6), the compression spring 9 is compressed to generate a biasing force. That is, the pressing member 8 is urged toward the protruding side (the protruding direction) of the latch 6.

  As shown in FIG. 2, the front end 8a of the pressing member 8 abuts against the side surface 15 of the pressed portion 14 of the latch 6 in the latch case 7 attached to the partition portion 5b, and presses the latch 6 in the protruding direction. To do. That is, when the biasing 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 41 a, and the lower end portion of the spring 70 (FIG. 2) attached to the attachment 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 (the swing main body 75) so as to raise the engaging portion 25. The spring 70 can be omitted.

  The link member 23 is rotatably mounted on the rotation shaft portion 42a. A common connecting member 47 is inserted through the connecting member insertion hole 65 b of the swing member 65 and the connecting member insertion hole 23 b of the link member 23. That is, the swing member 65 and the link member 23 are connected to each other by the connecting member 47 so as to be relatively rotatable. Further, as shown in FIG. 2 and the like, the connecting member 47 is disposed between the rotation shaft portion 41a of the swing body portion 75 of the swing member 65 and the rotation shaft portion 42a of the link member 23. FIG. 12 shows a state in which the connecting member 47 is disposed between the rotating shaft portions 41 a and 42 a 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 swinging main body 75 and the link member 23 of the swinging member 65 have facing portions 67 and 68, respectively, and the facing portions 67 and 68 are opposed to each other with a space therebetween. doing. Between the opposing parts 67 and 68, the press pieces 71 and 72 which interlock | cooperate with the push pull handle (not shown) provided in the door 1 (FIG. 1) of the outward opening are arrange | positioned. The pressing piece 71 is a member that operates in conjunction with an operation member (push-side handle) on the indoor side of the door 1, and the pressing piece 72 is interlocked with an operation member (pull-side handle) on the outdoor side of the door 1. An operating member.

  The pressing pieces 71 and 72 are arranged so as to overlap in the direction orthogonal to the paper surface in FIG. 7B, the pressing piece 71 is on the near side, and the pressing piece 72 overlaps the pressing piece 71 and cannot be seen. . Moreover, in FIG.8 (b), since the press piece 71 moved to the left, a part of front-end | tip part of the press 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 rotation shaft portion 41a and the moment around the rotation 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 for operating the pull side handle and the push side handle is the same.

  A shaft member 64 fixed to the lock box 5 is inserted through the long hole 63 a of the shaft insertion portion 63 of the pulling member 29. The pulling member 29 is disposed 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 pulling member 29 are the arm portions 43a. , 43b are fitted into the support holes 45a, 45b. That is, the pulling member 29 and the link member 23 can be rotated relative to each other around the engaging protrusions 58a and 58b.

  Although the pulling member 29 and the link member 23 can be rotated relative to each other, the arms 59a and 59b of the pulling member 29 are pressed at a certain rotating position shown in FIGS. 5, 7A, and 7B. The parts 60a and 60b (FIG. 10) and the pressing member engaging parts 49a and 49b of the arm parts 43a and 43b of the link member 23 are arranged in the same plane.

  6, 8 </ b> A, and 8 </ b> B, the pressing portions 60 a and 60 b (FIG. 10) of the arm portions 59 a and 59 b of the traction member 29 are connected to the link member 23. It moves to the retreat side (retreat direction) rather than the pressing member engaging portions 49a, 49b of the arm portions 43a, 43b.

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

As shown in FIG. 5, the pressing member 8 is biased to the protruding side by a compression spring 9 (biasing member), the tip end portion 8 a presses the side surface portion 15 of the latch 6, and the latch 6 is the latch case 7. Is in contact with the edge 39 (FIG. 13C).
Further, the engaging portion 25 of the swing member 65 passes through the long hole 50 b of the partition portion 5 b and the long hole 28 a of the latch case 7 shown in FIG. 15 and engages with the engaging recess 38 of the latch 6. .
That is, the engaging portion 25 is lifted by the biasing force of the compression spring 9 and is engaged with the engaging recess 38 of the latch 6, and the spring 70 biases the swinging member 65 in an auxiliary manner. Is raised. The spring 70 also functions as a support member that supports the swing member 65. The spring 70 can 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. That is, the front end portion 8a of the pressing member 8 biased by the compression spring 9 presses the side surface portion 15 of the latch 6, and the latch 6 protrudes from the latch case 7 (the lock box 5, the door 1) and receives the door frame 2. It invades and engages the portion 2a.

When opening the door 1 that opens outward, the locking mechanism 19 (FIG. 2) is first unlocked.
When the door 1 is opened from the room side, the locking mechanism 19 is driven by operating a thumb turn (not shown), and the engaging portion 21a of the locking mechanism 19 is engaged with the engaging recess of the latch 6 as shown in FIG. The latch 6 is removed from the position 34 and the latch 6 is unlocked.

  When a person tries to go out of the room from the room, the link mechanism 76 is moved from the state shown in FIG. 7B by operating a push-side handle (not shown) on the room side of the door 1 that is open. The state changes to the state shown in FIG. 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 to press the opposing portion 67 of the swing member 65, and the spring 70 (FIG. 2) and The swing member 65 rotates (swings) counterclockwise (arrow A) about the rotation shaft portion 41 a against the biasing force of the compression spring 9, and the engagement portion 25 engages with the engagement recess of the latch 6. 38, and the state shown in FIGS. 8B and 16B is obtained. That is, the engaging portion 25 of the swing member 65 (inversion prevention member) moves in the direction indicated by the arrow A intersecting the protruding direction of the latch 6 (the direction from the retracted side to the protruding side), and the latch 6 is engaged. It comes off from the concavity 38.

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

That is, while the pulling member 29 moves to the retracting side, the posture of the pulling member 29 changes from the state shown in FIG. 7B to the state shown in FIG. 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 retracted 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 retracted side, and the pressing member 8 is retracted against the urging force of the compression spring 9. Tow to the entry side. As a result, as shown in FIGS. 16 (b) and 16 (c), the pressing member 8 moves to the retreating side, and the distal end portion 8 a of the pressing member 8 is separated 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. The latch 6 is in an invertible state.

  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 reversed while the latch case 7 (lock box 5, door 1) Get inside. That is, the latch 6 does not serve as a resistance for the opening operation of the door 1 but retreats into the latch case 7 while changing the posture by contacting 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 connected to the rotating shaft portion 41a. The link member 23 rotates about the rotation shaft portion 42a. However, there is a slight 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 swinging 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 in the resin main body portion 6a, and the impact when the latch 6 collides with the door frame 2 is alleviated, and the collision sound is hardly generated. 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 the inclined surface portions 35a and 35b are also formed on the resin main body portion 6a. The impact of the impact is alleviated and the impact sound is less likely to occur.

  When the door 1 shown in FIG. 17 is opened and the hand is released from the indoor operation member (push-side handle), the state shown in FIGS. 5 and 7B is changed from the state shown in FIGS. Then, the pressing piece 71 returns to the original position and does not press the opposing portion 67 of the swinging member 65, and the swinging member 65 rotates clockwise by the biasing force of the compression spring 9 and the spring 70 shown in FIG. To return to the original posture.

  That is, since the swinging member 65 rotates clockwise, the connecting member 47 moves downward, the link member 23 rotates counterclockwise, and the pulling member 29 moves to the protruding side. That is, the posture of the pulling member 29 returns to the original position, and the arm portion 59a of the pulling member 29 moves to the protruding side. As a result, the pulling member 29 does not pull the rear end flange portion 56 of the pressing member 8 to the retracting side (retracting direction), and the pressing member 8 moves to the protruding side by the biasing force of the compression spring 9, and the leading end 8a. Presses the side surface 15 of the latch 6. Therefore, the latch 6 protrudes from the latch case 7, the upright portions 32a, 32b, 40a, 40b abut against the edges 39a, 39b of the latch case 7, and the latch 6 returns to the original posture. Since the upright portions 32a, 32b, 40a, and 40b are portions formed in 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 swing 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 Causes the latch 6 to be non-invertible.
That is, the engaging part 25 approaches and engages with the engaging recess 38 from the direction intersecting the protruding direction of the latch 6 so that the latch 6 cannot be reversed.

  When the door 1 is closed in the state shown in FIGS. 18A and 18B, the closing contact portion 31 b of the latch 6 that cannot be reversed collides with the door frame 2. As shown in FIG. 18B, the closing contact portion 31 b of the latch 6 that is not inverted is inclined with respect to the door frame 2. For this reason, when the door 1 is closed, the latch 6 moves the door 1 (the latch case 7, the lock box while sliding the closing contact portion 31b with respect to the door frame 2 as shown in FIG. 18 (c). 5) Retreat inside. 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. Moves to the side, enters the receiving portion 2a and engages.

  When the latch 6 moves to the retracted side and to the projecting 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 engagement portion 25 and the engagement recess 38 prevents the latch 6 from being reversed, 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. 18 (c), the latch 6 temporarily retracts into the latch case 7, and further protrudes when the latch 6 faces the receiving portion 2a. The standing portions 32 a, 32 b, 40 a, 40 b of the latch 6 abut on the edges 39 a, 39 b of the latch case 7. Therefore, even if the upright portions 32a, 32b, 40a, and 40b are resin materials, a collision sound is generated. That is, even if the hand is released from the push-pull handle of the opened door 1, the door 1 can be closed, but a collision sound is generated.

  Therefore, the person who closes the door 1 operates a push-pull handle (not shown) to disengage the pressing member 8 from the latch 6 as shown in FIG. When the door 1 is closed in this state, the latch 6 easily retreats into the latch case 7, and the state shown in FIG. When the door 1 closes 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 collide with the latch case 7 suddenly. When the door 1 is operated in this manner, no sound is generated due to the latch 6.

  The pressing member 8 moves to the protruding side (projecting direction) or the retracting side (retracting direction) of the latch 6 to press the latch 6 or release the pressing. Further, the engaging portion 25 of the swinging member 65 (reverse blocking member) moves forward and backward 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 each other. Thereby, 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 swing member 65 advances and retreats in a direction intersecting with the protruding direction of the latch 6, the latch 6 does not move following the advance and retreat 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 projecting direction (direction toward the projecting side or the retracting side). The position will not be changed carelessly.

  In other words, the forward / backward movement of the pressing member 8 and the forward / backward movement of the engaging portion 25 are linked, but the forward / backward movement of the pressing member 8 does not hinder the forward / backward movement of the engaging portion 25. Further, the advance / retreat operation of the engagement portion 25 does not hinder the advance / retreat operation of the pressing member 8.

  Specifically, the pressing member 8 and the engaging portion 25 are both pressed against and engaged with the latch 6. Both of them are detached from the latch 6. Here, when the pressing member 8 is disengaged from the latch 6, the disengagement between the engaging portion 25 and the latch 6 is not hindered. Conversely, when the engaging portion 25 is disengaged from the latch 6, The latch release is not hindered.

  Therefore, it is possible to reliably implement the biasing force of the compression spring 9 (biasing member) to act on the latch 6 or prevent the biasing force of the compression spring 9 from acting on the latch 6 by the forward / backward movement of the pressing member 8. . Further, the engaging portion 25 can be engaged with the engaging recess 38 of the latch 6 and the engaging portion 25 can be removed from the engaging recess 38 of the latch 6 by the forward and backward movement of the engaging portion 25.

  For this reason, the situation in which the latch 6 cannot be reversed and does not sufficiently retract 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 reversed while protruding from the latch case 7, and the latch 6 does not come out of the receiving portion 2 a of the door frame 2 and the door 1 is locked to the door frame 2 It does not occur and the door 1 can be reliably opened and closed.

  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 quickly operated until immediately before the latch 6 (the standing portions 32a, 32b, 40a, 40b) contacts the latch case 7 (edges 39a, 39b), and the push-pull handle is operated immediately before both the contacts. Operate slowly. By operating the push-pull handle in this way, it is possible to prevent the occurrence of a collision sound and to quickly intrude the latch 6 into the receiving portion 2a of the door frame 2 so that it cannot be reversed.

  The latch 6 can be prevented from colliding with the latch case 7 by the operator's control of the push-pull handle, the latch 6 is brought into contact with the latch case 7 slowly, and the occurrence of collision noise is suppressed, and The latch 6 can be brought into a non-invertible state by promptly engaging the engagement portion 25 of the swing member 65 with the engagement recess 38 of the latch 6.

  If the door 1 is closed in the state shown in FIGS. 18A and 18B, the latch 6 that cannot be reversed collides with the door frame 2. Therefore, the person who goes out of the room that closes the door 1 slowly closes the door 1 while pulling the pull-side handle on the outdoor side. The door 1 is provided with a door closer (automatic closing device) (not shown), and the door 1 is closed while pulling the pull side handle so that the speed at which the door 1 is closed becomes slow.

  Further, when the door 1 is operated and opened from the outdoor side, when the pull-side handle on the outdoor side is pulled, as shown in FIG. 9, the pressing piece 72 interlocked with the pull-side handle causes the facing portion 68 of the link member 23 to move. The swing member 65 connected to the link member 23 is rotated counterclockwise as indicated by the arrow A, and the engaging portion 25 is disengaged from the engaging recess 38 of the latch 6. Then, the pressing member 8 moves to the retracting side, the tip end 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.

The latch 6 shown in FIG. 16 (c) is not fixed and can be reversed. When the door 1 is opened and the latch 6 collides with the door frame 2, the latch 6 is easily reversed as shown in FIG. However, it enters into the latch case 7.
Then, the person who operates the door 1 enters the room from the outside, releases his 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 pushes the push-side handle. Then, the pressing member 8 moves slowly to the protruding side, and the tip 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 swing member 65 engages with the engaging recess 38 of the latch 6, resulting in the state shown in FIG. That is, the latch 6 is engaged with the receiving portion 2a of the door frame 2, and the latch 6 is in a non-reversible state.

As described above, whether the door 1 is opened from the indoor side or the outdoor side, the latch lock 3 operates in the same manner.
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, and the latch lock 3 can be operated from either the indoor side or the outdoor side of the door 1. It operates in the same way.

  Further, when the push-side handle and the pull-side handle are operated simultaneously, the pressing piece 71 moves to the left and presses the opposing portion 67 of the swing member 65, and the pressing piece 72 moves to the right and links member 23. The opposing portion 68 is pressed. Therefore, even when both the handles are temporarily operated when going out of the room from the room 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 reversible. 18 (a) and FIG. 18 (b) do not protrude, and the state of retreating into the latch case 7 shown in FIG. 17 can be maintained. Therefore, it is possible to satisfactorily suppress the generation of sound due to the latch lock 3 when the door 1 is opened and closed.

In the above-described embodiment, the case where the link member 23 and the pulling member 29 are provided in the link mechanism unit 76 and the pressing member 8 is pulled in the retracting direction by the pulling member 29 has been described, but the pulling member 29 may be omitted. it can. That is, the pulling member 29 can be omitted, and the rear end flange portion 56 of the pressing member 8 can be pulled to the retracted side by the pair of arm portions 43a and 43b of the link member 23 shown in FIG. Specifically, a pair of arm portions 43a and 43b of the link member 23 are
A portion indicated by reference numeral 73 is a support portion. The distance between the pair of arm portions 43a and 43b is set to such an extent that the pressing member 8 can be disposed between both arm portions 43a and 43b, and the rear end flange portion 56 is brought into contact with the end surface on the retracting side of the support portion 73. Let 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 swinging member 65 or the facing portion 68 of the link member 23, the swinging member 65 is moved. It rotates counterclockwise around the rotation shaft portion 41a, the engagement portion 25 is disengaged from the engagement recess 38 of the latch 6, and the link member 23 rotates clockwise around the rotation shaft portion 42a. The support part 73 moves to the retreat side. Therefore, the pressing member 8 is pulled toward the retracting side, and the tip end portion 8 a 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 pulling member.
The rotation angle of the link member 23 is ensured so that the link member 23 can sufficiently pull the pressing member 8 toward the retracted side.

1 Door 3 Latch lock 5 Lock box (main box)
6 Latch 8 Pressing member 9 Compression spring (biasing member)
23 Link member 25 engaging portion (latch engaging portion)
41a Rotating shaft portion of oscillating member (inversion blocking member side fixed rotating shaft)
42a Rotating shaft portion of link member (link member side fixed rotating shaft)
47 Connection member (connection shaft)
65 Oscillating member (reverse blocking member)
71, 72 Pressing piece (drive mechanism)
76 Link mechanism

Claims (2)

In the latch lock combined with the push-pull handle, having a reversible latch in the main body box, and by operating the push-pull handle, the latch can be reversed.
A pressing member for pressing the latch in a protruding direction from the main body box;
A biasing member that biases the pressing member in the protruding direction;
An inversion prevention member that engages with the latch and prevents inversion of the latch;
The reversal prevention member moves forward and backward in a direction crossing the protruding direction of the latch, and engages and disengages from the latch.
Having a drive mechanism that operates by operating a push-pull handle;
The drive mechanism engages the pressing member and the reverse blocking member directly or indirectly to link the pressing member and the reverse blocking member.
An operation of moving the pressing member in the retracting direction by the driving mechanism and an operation of releasing the engagement between the reverse blocking member and the latch are executed in cooperation. A link mechanism that engages the pressing member and operates the pressing member;
The link mechanism portion has a link member, and the link member swings around a link member side fixed rotation shaft fixed to the main body box,
The reversal prevention member has a swinging main body part and a latch engaging part that engages with a latch, and swings around a reversal prevention member side fixed rotation shaft fixed to the main body box. ,
The link member and the swinging main body are engaged via a connecting shaft,
The drive mechanism engages with the swinging main body portion or the link member of the reverse blocking member,
The link member swings about the link member side fixed rotation axis in conjunction with the swing main body unit swinging about the reverse blocking member side fixed rotation axis, or
2. The swing main body swings about a reverse rotation prevention member side fixed rotation axis in conjunction with the link member swinging about a link member side fixed rotation axis. Latch lock as described.

Images