Latch lock

Abstract

To provide a latch lock capable of preventing a latch bolt from protruding due to centrifugal force with a simple structure.SOLUTION: A latch lock 1 includes a latch bolt 5 that is retracted when a door is open and protrudes due to a magnetic force between the latch bolt and a striker when the door is closed, and restricting members 2 and 3 that restrict the latch bolt 5 from protruding due to centrifugal force when the door moves. The restricting members 2 and 3 include a rotating member 2 that is rotatably provided with respect to a case 8 that houses the latch bolt 5, and a moving member 3 that rolls to rotate the rotating member 2 when centrifugal force is generated. The latch bolt 5 includes a receiving portion 5a that comes into contact with a part of the rotating member 2 when the rotating member 2 rotates due to centrifugal force, preventing the latch bolt 5 from protruding.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a latch lock having a latch bolt that is retracted when the door is open and protrudes when the door is closed due to the magnetic force between it and a strike, and more particularly to a latch lock equipped with a mechanism that prevents the latch bolt from protruding due to centrifugal force when the door moves. [Background technology]

[0002] A latch lock having a latch bolt that is retracted when the door is open and that protrudes when the door is closed due to magnetic force between the latch bolt and a strike is widely known. In such latch locks, the tip of the latch bolt is provided with a metal or magnet, and the strike is provided with a magnet or metal, or both the tip of the latch bolt and the strike may be magnetic.

[0003] When there is no magnetic force between the strike and the latch bolt, that is, when the door is open, a biasing force acts on the latch bolt to retract it, so that the latch bolt does not protrude from the door while it is open. When the latch bolt approaches the strike, the magnetic force generated between the tip of the latch bolt and the strike causes the latch bolt to protrude from the door.

[0004] With this type of latch lock, if the door is slammed shut and the centrifugal force generated when the door is closed exceeds the force that retracts the latch bolt, the latch bolt can protrude from the door, causing problems such as the door not closing properly or damaging the door frame.

[0005] In order to solve the problem of the latch bolt protruding due to centrifugal force, the inventions described in Patent Documents 1 to 4 have been proposed.

[0006] In the latch locks described in Patent Documents 1 and 2, centrifugal force causes a pendulum member (17) (the symbols in parentheses refer to patent documents; the same applies below) to swing, limiting the protrusion of the latch bolt (13).

[0007] In the latch lock described in Patent Document 3, a pendulum (6) swings due to centrifugal force to limit the protrusion of a lock rod (1).

[0008] In the latch lock described in Patent Document 4, a bolt groove portion (71) having a curved surface portion (73) is formed on the latch bolt, and a spherical regulating member (85) is inserted into the bolt groove portion (71).When centrifugal force is generated, the spherical regulating member (85) enters the connecting groove (87), thereby restricting the protrusion of the lock bolt (11). [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 10-110566 [Patent Document 2] Japanese Patent Application Publication No. 11-93486 [Patent Document 3] Japanese Patent Application Laid-Open No. 2001-12125 [Patent Document 4] Japanese Patent Application Publication No. 2023-78821 Summary of the Invention [Problem to be solved by the invention]

[0010] When a pendulum is used to limit the protrusion of the latch bolt as described in Patent Documents 1 to 3, the lower part of the pendulum needs to be made heavier, which increases the manufacturing cost of the pendulum.

[0011] In the structure of Patent Document 4, a groove with a curved surface needs to be formed in the latch bolt, which makes manufacturing the latch bolt complicated.

[0012] Therefore, an object of the present invention is to provide a latch lock that has a simple structure and can prevent the latch bolt from protruding due to centrifugal force. [Means for solving the problem]

[0013] In order to solve the above problems, the present invention has the following features. The present invention provides a latch bolt that is retracted when the door is open and protrudes when the door is closed by the magnetic force between the latch bolt and the strike; Located on the outside of the latch bolt, This latch lock is equipped with a restricting member that restricts the latch bolt from protruding due to centrifugal force when the door moves. The restricting member includes a rotating member that is rotatably provided with respect to a case that houses the latch bolt, and a moving member that rolls to rotate the rotating member when centrifugal force is generated. The latch bolt includes a receiving portion that comes into contact with a part of the rotating member when the rotating member rotates due to centrifugal force, thereby preventing the latch bolt from protruding.

[0014] Preferably, the restricting member is out of contact with the receiving portion when no centrifugal force is applied.

[0015] Preferably, the rotating member is moved away from the contact position by its own weight when no centrifugal force is applied.

[0016] Preferably, the case has an inclined portion for placing the moving member thereon. The inclined portion is inclined so that the protruding side of the latch bolt is higher than the base end side of the latch bolt.

[0017] In one embodiment, the restricting member is provided below the latch bolt. When centrifugal force is not generated, the pivoting member pivots downward under its own weight, moving out of the contact position. When centrifugal force is generated, the pivoting member is pushed upward by the moving member, pivoting and moving to the contact position.

[0018] In another embodiment, the restricting member is provided above the latch bolt. When centrifugal force is not generated, the moving member moves to the lower side of the inclined portion, pushing the rotating member upward and rotating, thereby moving out of the contact position. When centrifugal force is generated, the rotating member moves to the upper side of the inclined portion, rotating downward under its own weight, and moving to the contact position.

[0019] As an example, the moving member is cylindrical or spherical.

[0020] The present invention also provides a door having a latch lock. The latch lock consists of a latch bolt that retracts when the door is open and protrudes when the door is closed due to the magnetic force between the latch bolt and the strike. Located on the outside of the latch bolt, The door is provided with a restricting member that restricts the latch bolt from protruding due to centrifugal force when the door moves. The restricting member includes a rotating member that is rotatably provided with respect to a case that houses the latch bolt, and a moving member that rolls to rotate the rotating member when centrifugal force is generated. The latch bolt includes a receiving portion that comes into contact with a part of the rotating member when the rotating member rotates due to centrifugal force, thereby preventing the latch bolt from protruding. [Effects of the Invention]

[0021] According to the present invention, a latch lock is provided that has a simple structure and can prevent the latch bolt from protruding due to centrifugal force.

[0022] The latch bolt is simply provided with a receiving portion, and the latch protrusion prevention mechanism has a simple structure, which reduces the cost of complex manufacturing and components.

[0023] When no centrifugal force is being generated, the restricting member is kept out of contact with the receiving portion, allowing the latch lock to function as normal.

[0024] A simple structure can be realized by using a structure in which the regulating member moves away from the contact position due to its own weight when no centrifugal force is being generated.

[0025] By providing the inclined portion, the moving member can be naturally placed on standby at the standby position when centrifugal force ceases to act.

[0026] The structure in which the restricting member is provided on the lower side makes it possible to prevent the latch bolt from protruding due to centrifugal force.

[0027] The structure in which the restricting member is provided on the upper side also makes it possible to prevent the latch bolt from protruding due to centrifugal force.

[0028] These and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. [Brief explanation of the drawings]

[0029] [Figure 1] Fig. 1 is a front view showing the internal structure of a latch lock 1 according to one embodiment of the present invention. Fig. 1 shows a case in which the latch bolt 5 is protruding due to the magnetic force generated between it and a strike (not shown). [Figure 2] Fig. 2 is a perspective view showing the internal structure of the latch lock 1. Fig. 1 shows a case where the latch bolt 5 is protruding due to the magnetic force generated between it and a strike (not shown). [Figure 3] Fig. 3 is a perspective view showing the latch lock 1 when closed by the cover member 12. Fig. 3 shows the case where the latch bolt 5 is protruding due to the magnetic force generated between it and a strike (not shown). [Figure 4] Fig. 4 is a front view showing the internal structure of the latch lock 1. Fig. 4 shows the state in which the latch bolt 5 is retracted by the biasing force of the biasing member 5e. [Figure 5] Fig. 5 is a front view showing the internal structure of the latch lock 1. Fig. 5 shows the state in which the hub member 4 is rotated by a handle (not shown) and the latch bolt 5 is retracted into the case 8. [Figure 6]Fig. 6 is a front view showing the internal structure of the latch lock 1. Fig. 6 shows a case where a door (not shown) is slammed shut and centrifugal force is generated. [Figure 7] 7A and 7B are diagrams showing the structure of the regulating members 2 and 3. Fig. 7A is a front view of the regulating members 2 and 3. Fig. 7B is a perspective view of the regulating members 2 and 3. [Figure 8] FIG. 8 is a front view showing a modified example of the latch bolt 5. As shown in FIG. [Figure 9] 9A and 9B are diagrams showing modified examples of the restricting members 21 and 31. Fig. 9A shows a case where no centrifugal force is generated, and Fig. 9B shows a case where centrifugal force is generated. [Figure 10] FIG. 10 is a diagram showing a case where the restricting members are provided above and below. DETAILED DESCRIPTION OF THE INVENTION

[0030] (basic structure) First, the basic structure of the latch lock 1 will be described with reference to FIGS. The latch lock 1 comprises a regulating member (sometimes referred to as regulating members 2, 3) consisting of a rotating member 2 and a moving member 3, a hub member 4, a latch bolt 5, a latch retraction member 6, a locking member 7, a case 8, a hub biasing member 9, a plate member 10, a decorative plate member 11, and a cover member 12.

[0031] 2 and 3, the internal structure of the latch lock 1 is housed inside a case 8, and a lid member 12 serves as a lid for the case 8. The latch lock 1 in the state shown in FIG. 3 is attached to a door (not shown).

[0032] The latch bolt 5 has a structure in which its tip protrudes from holes provided in the plate member 10 and the decorative plate member 11. The latch body 5b has a receiving portion 5a that protrudes downward. A latch base end 5d is provided on the base end side of the latch body 5b. The latch base end 5d has a protrusion that fits into the slide groove 8a provided in the case 8 and the cover member 12 so that it can slide along the slide groove 8a. An L-shaped portion 5c is provided between the latch base end 5d and the latch body 5b. The L-shaped portion 5c has the function of allowing locking by the locking member 7 only when the latch bolt 5 protrudes.

[0033] The latch body 5b has a hollowed-out shape. A biasing member 5e is provided in the hollowed-out portion. One end of the biasing member 5e contacts a biasing base 8d provided on the case 8. The other end of the biasing member 5e contacts the hollowed-out portion of the latch body 5b. As a result, a biasing force toward the inside of the door is constantly acting on the latch bolt 5.

[0034] The hub member 4 is attached so as to be rotatable around holes provided in the case 8 and the cover member 12. A biasing force is applied to the hub member 4 from the hub biasing member 9. A biasing force is constantly applied to the hub biasing member 9 by a biasing member 9a provided between the hub biasing member 9 and a biasing base 8e provided on the case 8. Therefore, the hub biasing member 9 maintains the position shown in Figures 1 and 4. A handle (not shown) is attached to the handle attachment hole 4a of the hub member 4.

[0035] Fulcrum 4b at the upper end of hub member 4 engages with grooves 8b provided in case 8 and case 12. Latch retraction member 6 is attached to the inside of the upper part of hub member 4 so that it can rotate (swing) around fulcrum 4b. Fulcrum 6a at the upper end of latch retraction member 6 engages with groove 8c provided in case 8 (there is a similar groove in cover member 12).

[0036] When the handle (not shown) is pushed downward, the hub member 4 rotates as shown in FIG. 5, and the latch retracting member 6 moves in conjunction with this. The latch retracting member 6 then pushes the latch base end 5b toward the door hinge, causing the latch bolt 5 to retract against the magnetic force. When the door is opened while pushing the handle and the magnetic force between the latch bolt 5 and the strike is no longer applied, the latch bolt 5 can be maintained in its retracted state by the biasing force of the biasing member 5e. When the handle is released, the biasing force of the biasing member 9a returns the hub member 4 to its original position, as shown in FIG. 4.

[0037] The locking member 7 is rotatably attached to holes provided in the case 8 and the cover member 12. The locking member 7 can be locked by rotating it 90 degrees clockwise in FIG. 1 to restrict the rotation of the hub member 4. One end of a torsion spring (not shown) is attached to an attachment portion 8f provided on the case 8. The other end of the torsion spring is attached to the locking member 7, so that the position of the locking member 7 is maintained.

[0038] (Protrusion prevention structure due to centrifugal force) Next, a structure for preventing the latch bolt 5 from protruding due to centrifugal force will be described with reference to FIGS. The restricting member prevents the latch bolt 5 from protruding when centrifugal force is generated. The restricting members 2, 3 are made up of a rotating member 2 and a moving member 3. 7, the rotating member 2 is hook-shaped (L-shaped), and the moving member 3 is a cylindrical member.

[0039] The rotating member 2 is attached to the case 8 and the cover member 12 so as to be able to rotate (swing) relative to the case 8 and the cover member 12 at a fulcrum 2a. The moving member 3 is placed on an inclined portion 8g provided on the case 8. Normally, the moving member 3 waits on the lower side of the slope of the inclined portion 8g due to its own weight (see FIG. 4).

[0040] As shown in Fig. 6, when centrifugal force is generated, the moving member 3 rolls to the upper side of the inclined surface of the inclined portion 8g. When the moving member 3 rolls to the upper side of the inclined surface, the rotating member 2 is pushed upward by the moving member 3 and rotates around the fulcrum 2a. Note that a protrusion is provided on the lower part of the rotating member 2 to restrict the moving member 3 from moving further upward, but this protrusion is not essential.

[0041] When the centrifugal force (the force acting on the left side in FIG. 1) becomes greater than the biasing force of the biasing member 5e (the force acting on the right side in FIG. 1), the latch bolt 5 tries to protrude due to the centrifugal force. At this time, as shown in FIG. 6, the receiving portion 5a of the latch bolt 5 comes into contact with the hook-shaped tip of the rotating member 2. The location where the receiving portion 5a and the hook-shaped tip of the rotating member 2 come into contact is referred to as the contact position. This contact prevents the latch bolt 5 from protruding due to the centrifugal force.

[0042] When the centrifugal force becomes smaller than the biasing force, the latch bolt 5 moves to the right in Figure 1 due to the biasing force of the biasing member 5e. This causes the contact at the contact position to be released. The rotating member 2 moves below the inclined portion 8g, and the moving member 3 moves away from the contact position due to its own weight, returning to the state shown in Figure 4.

[0043] This mechanism prevents the latch bolt 5 from protruding when centrifugal force is generated. There is no need to form a complex curved groove in the latch bolt 5; it is sufficient to provide only the receiving portion 5a. The rotating member 2 is not a complex structure that requires weight adjustment, such as a pendulum. Therefore, the restricting members 2 and 3 can be realized with a simple structure.

[0044] (Variation) In the above embodiment, the shape of the rotating member 2 is L-shaped, but the shape of the rotating member 2 is not limited to that shown in the drawing as long as it has a shape that can contact the latch bolt 5 and restrict movement.

[0045] In the above embodiment, the moving member 3 is cylindrical, but it may be spherical, or may be any other member that rolls or slides with low friction, and is not limited to the above.

[0046] Although the movable member 3 is returned to its original position by the inclined surface 8 when centrifugal force is not applied, it may be configured to return to its original position by the force of a spring or the like. In that case, the force should be such that the movable member 3 can move to a position that rotates the rotating member 2 when centrifugal force is applied.

[0047] In the above embodiment, the receiving portion 5a has a shape that protrudes from the latch main body 5b, but as shown in Fig. 8, a receiving portion that comes into contact with the rotating member 2 may be constructed as a recess 5f provided in the latch main body 5b. The shape of the receiving portion does not limit the present invention, and any shape may be used as long as it has a structure that has a contact position with the rotating member 2.

[0048] In the above embodiment, the restricting member is provided below the latch bolt, but it may be provided above the latch bolt. For example, restricting members 21 and 31 can be constructed above the latch bolt 5, as shown in FIG.

[0049] As shown in Fig. 9(a), the moving member 31 is placed on the inclined portion 81g provided on the case 8. The moving member 21 is attached to the case 8 so as to be rotatable around the fulcrum 21. In this state, the presence of the moving member 31 prevents the rotating member 21 from coming into contact with the receiving portion 5a.

[0050] 9(b), when the moving member 31 moves upward on the slope, it comes out from under the rotating member 21, causing the rotating member 21 to move downward under its own weight. This causes the rotating member 21 to come into contact with the receiving portion 5a, preventing the latch bolt 5 from protruding.

[0051] When the centrifugal force disappears, the moving member 31 moves under its own weight below the inclined portion 81g, returning to the state shown in FIG. 9(a), and the contact between the rotating member 21 and the receiving portion 5a disappears.

[0052] In this way, the restricting member can be positioned above the latch bolt 5 in addition to being positioned below it. The shapes of the moving member 31 and the rotating member 21 when the restricting member is positioned above the latch bolt 5 are the same as when it is positioned below, and the illustrated shapes are merely examples.

[0053] As shown in FIG. 10, restricting members may be provided above and below the latch bolt 5.

[0054] Although the present invention has been described in detail above, the above description is merely illustrative of the present invention in all respects and is not intended to limit its scope. It goes without saying that various improvements and modifications can be made without departing from the scope of the present invention. Each of the constituent elements of the invention disclosed in this specification is considered to be an independent, stand-alone invention. Inventions that combine the constituent elements in any manner are also included in the present invention. The specific expressions in this specification are merely examples, and the present invention also includes those that conceptualize these exemplary expressions. [Industrial Applicability]

[0055] The present invention is a latch lock and is industrially applicable. [Explanation of symbols]

[0056] 1 latch lock 2 Rotating member 2a fulcrum 3 Moving parts 2,3 Regulating member 4 Hub parts 4a Handle mounting hole 4b Fulcrum 5 Latch bolt 5a Receiving part 5b Latch body 5d Latch base end 5e biasing member 5f recess 6 Latch retraction member 6a Fulcrum 7 Locking member 8 cases 8a Slide groove 8b groove 8c groove 8d biasing stand 8e Power Stand 8f Mounting part 8g inclined part 9 Hub biasing member 9a biasing member 10 Plate members 11 Decorative panel materials 12 Lid member 21,31 Regulatory member 21 Rotating member 31 Moving parts 81g slope part

Claims

1. A latch lock comprising: a latch bolt that is retracted when the door is open and that protrudes when the door is closed due to the magnetic force between it and a strike; and a restricting member that is provided on the outside of the latch bolt and restricts the latch bolt from protruding due to centrifugal force when the door moves. The regulating member is a rotating member rotatably provided with respect to a case that accommodates the latch bolt; a moving member that rolls to rotate the rotating member when the centrifugal force is generated, A latch lock characterized in that the latch bolt includes a receiving portion that comes into contact with a part of the rotating member when the rotating member rotates due to the centrifugal force, thereby preventing the latch bolt from protruding.

2. The latch lock according to claim 1, wherein the restricting member is out of contact with the receiving portion when the centrifugal force is not being applied.

3. 3. The latch lock according to claim 2, wherein the rotating member is displaced from the contact position by its own weight when the centrifugal force is not being applied.

4. the case has an inclined portion on which the moving member is placed, The latch lock according to claim 2, wherein the inclined portion is inclined so that the protruding side of the latch bolt is higher than the base end side of the latch bolt.

5. The restricting member is provided below the latch bolt, The rotating member is When the centrifugal force is not generated, the contact point is displaced by the weight of the contact point.

5. The latch lock according to claim 4, wherein when the centrifugal force is generated, the latch lock is pushed upward by the moving member and rotates to move to the contact position.

6. The restricting member is provided above the latch bolt, The rotating member is When the centrifugal force is not generated, the moving member moves to the lower side of the inclined portion, and is pushed upward and rotated, thereby moving away from the contact position, The latch lock according to claim 4, characterized in that when the centrifugal force is generated, the rotating member moves to the upper side of the inclined portion, and then rotates downward under its own weight, thereby moving to the contact position.

7. The latch lock according to claim 1, wherein the moving member is cylindrical or spherical.

8. A door equipped with a latch lock, The latch lock is a latch bolt that is retracted when the door is open and that protrudes when the door is closed by a magnetic force between the latch bolt and a strike; a restricting member provided on the outside of the latch bolt to restrict the latch bolt from protruding due to centrifugal force when the door moves; The regulating member is a rotating member rotatably provided with respect to a case that accommodates the latch bolt; a moving member that rolls to rotate the rotating member when the centrifugal force is generated, The door, wherein the latch bolt includes a receiving portion that comes into contact with a part of the rotating member when the rotating member rotates due to the centrifugal force, thereby preventing the latch bolt from protruding.

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