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 retracts when the door is open and protrudes by magnetic force between it and a strike when the door is closed. More specifically, the present invention relates to a latch lock provided with a mechanism that prevents the latch bolt from protruding due to centrifugal force when the door moves.

Background Art

[0002] Latch locks having a latch bolt that retracts when the door is open and protrudes by magnetic force between it and a strike when the door is closed are widely known. In such a latch lock, a metal or a magnet is provided at the tip of the latch bolt. And a magnet or a metal is provided on the strike. In some cases, both the tip of the latch bolt and the strike are magnets.

[0003] When the magnetic force between the latch bolt and the strike does not act, that is, when the door is open, a biasing force that retracts the latch bolt acts on the latch bolt. Therefore, while the door is open, the latch bolt is configured not to protrude from the door. When the latch bolt approaches the strike, the latch bolt protrudes from the door due to the magnetic force generated between the tip of the latch bolt and the strike.

[0004] In such a latch lock, when the door is closed forcefully, if the centrifugal force generated when the door closes is greater than the biasing force that retracts the latch bolt, there is a problem that the latch bolt protrudes from the door. If the latch bolt protrudes from the door, problems such as the door not closing properly or damaging the door frame may occur.

[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 Document 1 and Patent Document 2, a pendulum member (17) (the reference numerals in parentheses are related to the patent documents. The same applies hereinafter) swings due to centrifugal force to restrict 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 restrict the protrusion of the lock rod (1).

[0008] In the latch lock described in Patent Document 4, a bolt-side groove portion (71) having a curved surface portion (73) is formed in the latch bolt, and a spherical regulating member (85) is placed in the bolt-side groove portion (71). When centrifugal force is generated, the spherical regulating member (85) enters a connecting groove (87) to restrict the protrusion of the lock bolt (11).

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0010] As described in Patent Documents 1 to 3, when using a pendulum to restrict the protrusion of the latch bolt, it is necessary to make the lower part of the pendulum heavy. In this case, the manufacturing cost of the pendulum increases.

[0011] In the case of the structure of Patent Document 4, it is necessary to form a groove having a curved surface in the latch bolt. In this case, the manufacturing of the latch bolt becomes complicated.

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

Means for Solving the Problems

[0013] In order to solve the above problems, the present invention has the following features. The present invention is a latch lock including a latch bolt that retracts when the door is open and protrudes by magnetic force between it and a strike when the door is closed, and a regulating member that regulates the protrusion of the latch bolt due to centrifugal force when the door moves. The regulating member includes a rotating member rotatably provided with respect to a case that houses the latch bolt, and a moving member that rolls and rotates the rotating member when centrifugal force occurs. The latch bolt includes a receiving portion that contacts a part of the rotating member when the rotating member rotates due to centrifugal force and prevents the latch bolt from protruding.

[0014] Preferably, the regulating member is disengaged from the contact position with the receiving portion in a situation where no centrifugal force is generated.

[0015] Preferably, the rotating member is disengaged from the contact position by its own weight in a situation where no centrifugal force is generated.

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

[0017] As an embodiment, the regulating member is provided below the latch bolt. In a situation where no centrifugal force is generated, the rotating member rotates downward by its own weight and is disengaged from the contact position. When centrifugal force occurs, the rotating member is pushed upward by the moving member and rotates to move to the contact position.

[0018] As another embodiment, the restricting member is provided above the latch bolt. In a situation where no centrifugal force is generated, the rotating member is pushed upward and rotated by the moving member moving to the lower side of the inclined portion, thereby disengaging from the contact position. When centrifugal force is generated, the rotating member moves to the upper side of the inclined portion and rotates downward by its own weight, thereby moving to the contact position.

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

[0020] Further, the present invention is a door including a latch lock. The latch lock includes a latch bolt that retracts when the door is open and protrudes by magnetic force with a strike when the door is closed, and 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 rotatably provided with respect to a case that houses the latch bolt, and a moving member that rolls and rotates the rotating member when centrifugal force is generated. The latch bolt includes a receiving portion that contacts a part of the rotating member when the rotating member rotates due to centrifugal force and prevents the latch bolt from protruding.

Advantages of the Invention

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

[0022] The restricting member is constituted only by the rotating member and the moving member, and it is only necessary to provide a receiving portion on the latch bolt, so that the latch protruding prevention mechanism has a simple structure. Therefore, complicated manufacturing and cost increase of members can be suppressed.

[0023] When no centrifugal force is generated, by preventing the restricting member from contacting the receiving portion, it can function as a normal latch lock.

[0024] When no centrifugal force is generated, a simple structure can be realized by adopting a structure in which the regulating member separates from the contact position under its own weight.

[0025] By providing the inclined portion, when the centrifugal force stops acting, the moving member can be naturally made to standby at the standby position.

[0026] By adopting a structure in which the regulating member is provided on the lower side, it is possible to prevent the latch bolt from protruding due to the centrifugal force.

[0027] By adopting a structure in which the regulating member is provided on the upper side, it is also possible to prevent the latch bolt from protruding due to the centrifugal force.

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

Brief Description of the Drawings

[0029]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

MODE FOR CARRYING OUT THE INVENTION

[0030] (Basic Structure) First, with reference to FIGS. 1 to 5, the basic structure of the latch lock 1 will be described. The latch lock 1 includes a regulating member (sometimes referred to as regulating members 2 and 3) composed of a rotating member 2 and a moving member 3, a hub member 4, a latch bolt 5, a latch retracting 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 lid member 12.

[0031] As shown in FIGS. 2 and 3, the internal structure of the latch lock 1 is housed inside the case 8, and the lid member 12 serves as the lid of the case 8. The latch lock 1 in the state of 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 is provided with a receiving portion 5a that protrudes downward. A latch base end portion 5d is provided on the base end side of the latch body 5b. The latch base end portion 5d has a protruding portion that fits into the slide groove 8a provided in the case 8 and the lid member 12 so as to slide along the slide groove 8a. An L-shaped portion 5c is provided between the latch base end portion 5d and the latch body 5b. The L-shaped portion 5c has a function of enabling locking by the locking member 7 only when the latch bolt 5 is protruding.

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

[0034] The hub member 4 is rotatably attached around holes provided in the case 8 and the lid member 12. A biasing force from the hub biasing member 9 is applied to the hub member 4. The biasing force always acts on the hub biasing member 9 by a biasing member 9a provided between the hub biasing member 9 and a biasing base 8e provided in the case 8. Therefore, the hub biasing member 9 maintains the postures shown in FIGS. 1 and 4. A handle (not shown) is attached to the handle attachment hole 4a of the hub member 4.

[0035] The fulcrum 4b at the upper end of the hub member 4 engages with a groove 8b provided in the case 8 and the case 12. Inside the upper part of the hub member 4, a latch retracting member 6 is rotatably (oscillatably) attached around the fulcrum 4b. The fulcrum 6a at the upper end of the latch retracting member 6 engages with a groove 8c provided in the case 8 (the lid member 12 also has a similar groove).

[0036] When the handle (not shown) is pushed downward, as shown in Fig. 5, the hub member 4 rotates, and linked thereto, the latch retraction member 6 moves. Then, the latch retraction member 6 pushes the latch base end portion 5b toward the hinge side of the door, causing the latch bolt 5 to retract against the magnetic force. While pushing the handle, if the door is opened and the magnetic force no longer acts between the latch bolt 5 and the strike, the latch bolt 5 can hold the retracted state by the biasing force of the biasing member 5e. If the hand is released from the handle, the hub member 4 returns to its original position by the biasing force of the biasing member 9a, and the state as shown in Fig. 4 is obtained.

[0037] The locking member 7 is rotatably attached to holes provided in the case 8 and the lid member 12. The locking member 7 can be locked by restricting the rotation of the hub member 4 by rotating it 90 degrees in the clockwise direction in Fig. 1. One end of a torsion spring (not shown) is attached to the attachment portion 8f provided in the case 8. By attaching the other end of the torsion spring to the locking member 7, the posture of the locking member 7 is maintained.

[0038] (Structure for preventing protrusion by centrifugal force) Next, with reference to Figs. 4, 6, and 7, the structure for preventing the protrusion of the latch bolt 5 by centrifugal force will be described. The regulating member prevents the latch bolt 5 from protruding when centrifugal force is generated. The regulating members 2, 3 are composed of a rotating member 2 and a moving member 3. As shown in Fig. 7, the rotating member 2 has a hook shape (L shape). The moving member 3 is a cylindrical member.

[0039] The rotating member 2 is attached to the case 8 and the lid member 12 so as to be rotatable (oscillatable) with respect to the case 8 and the lid member 12 at the fulcrum 2a. The moving member 3 is placed on the inclined portion 8g provided in the case 8. Normally, the moving member 3 waits below the slope of the inclined portion 8g by its own weight (see Fig. 4).

[0040] As shown in FIG. 6, when centrifugal force is generated, the moving member 3 rolls onto the upper side of the inclined surface of the inclined portion 8g. When the moving member 3 rolls onto the upper side of the inclined surface, the rotating member 2 is pushed upward by the moving member 3 and rotates about the fulcrum 2a. Although a protrusion for restricting the further upward movement of the moving member 3 is provided at the lower portion of the rotating member 2, the protrusion is not essential.

[0041] When the centrifugal force (the force generated on the left side in FIG. 1) is greater than the biasing force of the biasing member 5e (the force generated on the right side in FIG. 1) of the latch bolt 5, the latch bolt 5 tends 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 portion of the rotating member 2. The place where the receiving portion 5a and the tip portion on the hook 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 side in FIG. 1 by the biasing force of the biasing member 5e. As a result, the contact at the contact position is released. The rotating member 2 moves to the lower side of the inclined portion 8g, and the moving member 3 moves away from the contact position by its own weight and returns to the state of FIG. 4.

[0043] With such a mechanism, when centrifugal force is generated, the latch bolt 5 is prevented from protruding. It is not necessary to form a complicated groove that curves in the latch bolt 5, and it is only necessary to provide the receiving portion 5a. The rotating member 2 is not a complicated one that requires adjustment of the weight like a pendulum. Therefore, the regulating members 2 and 3 are realized with a simple structure.

[0044] (Modification example) 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 the illustrated one as long as it can come into contact with the latch bolt 5 and restrict its movement.

[0045] In the above embodiment, the moving member 3 is cylindrical, but it may be spherical, and other members that roll or slide with low friction are not limited to those described above.

[0046] The moving member 3 is configured to return to its original position by the slope 8 when centrifugal force does not act, but it may also have a structure that returns to its original position by a force such as a spring. In that case, the force may be such that when centrifugal force is generated, the moving member 3 can move to a position where it rotates the rotating member 2.

[0047] In the above embodiment, the receiving portion 5a has a shape that protrudes from the latch body 5b. However, as shown in FIG. 8, a receiving portion that contacts the rotating member 2 may be constructed in a recess 5f provided in the latch body 5b. In addition, the shape of the receiving portion does not limit the present invention, and any shape may be used as long as it 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. For example, as shown in FIG. 9, restricting members 21 and 31 can be constructed above the latch bolt 5.

[0049] As shown in FIG. 9(a), the moving member 31 is placed on the inclined portion 81g provided in the case 8. The moving member 21 is attached to be rotatable about the fulcrum 21 with respect to the case 8. In this state, due to the presence of the moving member 31, the rotating member 21 and the receiving portion 5a do not come into contact.

[0050] When centrifugal force acts, as shown in FIG. 9(b), when the moving member 31 moves upward on the slope, the moving member 31 comes off from below the rotating member 21, so the rotating member 21 moves downward by its own weight. As a result, the rotating member 21 comes into contact with the receiving portion 5a, preventing the protrusion of the latch bolt 5.

[0051] If the centrifugal force disappears, the moving member 31 moves downward under its own weight along 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] Thus, the regulating member can be configured to be located above the latch bolt 5 in addition to being located below it. The shapes of the moving member 31 and the rotating member 21 when the regulating member is located above the latch bolt 5 are merely examples, similar to the case when it is located below.

[0053] And, as shown in Fig. 10, regulating members may be provided above and below the latch bolt 5.

[0054] Although the present invention has been described in detail above, the foregoing description is merely illustrative of the present invention in every respect and is not intended to limit its scope. Needless to say, various improvements and modifications can be made without departing from the scope of the present invention. Each constituent element disclosed in this specification is assumed to be independently a separate invention. Inventions obtained by combining each constituent element in any combination method are also included in the present invention. Regarding the specific expressions in this specification, they are merely illustrative, and the present invention includes those obtained by conceptualizing the illustrative expressions.

Industrial Applicability

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

Explanation of Reference Numerals

[0056] 1 Latch lock 2 Rotating member 2a Fulcrum 3 Moving member 2, 3 Regulating member 4 Hub member 4a Hole for attaching handle 4b Fulcrum 5 Latch bolt 5a Receiving portion 5b Latch body 5d Latch base end 5e Biasing member 5f Recess 6 Latch retraction member 6a Fulcrum 7 Locking member 8 Case 8a Slide groove 8b Groove 8c Groove 8d Biasing platform 8e Biasing platform 8f Mounting portion 8g Inclined portion 9 Hub biasing member 9a Biasing member 10 Plate member 11 Decorative panel member 12 Cover member 21, 31 Restricting member 21 Rotating member 31 Moving member 81g Inclined portion

Claims

1. When the door is open, it is retracted, and when the door is closed, it includes a latch bolt that protrudes due to the magnetic force between it and the strike, and a regulating member that restricts the protrusion of the latch bolt due to the centrifugal force when the door moves. The latch lock is characterized in that The regulating member A rotating member rotatably provided with respect to a case that houses the latch bolt, and When the centrifugal force occurs, it includes a moving member that rolls and rotates the rotating member, and The latch bolt includes a receiving portion that prevents the latch bolt from protruding by contacting a part of the rotating member when the rotating member rotates due to the centrifugal force. The latch lock is characterized by this.

2. The regulating member is out of contact with the receiving portion in a situation where no centrifugal force is generated. The latch lock according to claim 1 is characterized by this.

3. The rotating member is out of contact with the contact position due to its own weight in a situation where no centrifugal force is generated. The latch lock according to claim 2 is characterized by this.

4. The case has an inclined portion for placing the moving member, and The inclined portion is inclined such that the protruding side is higher than the base end side of the latch bolt. The latch lock according to claim 2 is characterized by this.

5. The regulating member is provided below the latch bolt, and The rotating member In a situation where no centrifugal force is generated, by rotating downward due to its own weight, it gets out of contact with the contact position, and When the centrifugal force occurs, it is pushed upward by the moving member and rotates to move to the contact position. The latch lock according to claim 4 is characterized by this.

6. The regulating member is provided above the latch bolt, and The rotating member is, In a situation where no centrifugal force is generated, the moving member moves to the lower side of the inclined portion, is pushed upward and rotated, and thus deviates from the contact position. When the centrifugal force is generated, the rotating member moves to the upper side of the inclined portion, rotates downward by its own weight, and moves to the contact position. The latch lock according to claim 4 is characterized in that.

7. The moving member is cylindrical or spherical. The latch lock according to claim 1 is characterized in that.

8. A door provided with a latch lock, The latch lock is, When the door is open, it retracts, and a latch bolt that protrudes by the magnetic force between it and a strike when the door is closed, A regulating member that regulates the protrusion of the latch bolt by the centrifugal force when the door moves is provided. The regulating member is, A rotating member rotatably provided with respect to a case that houses the latch bolt, And a moving member that rolls when the centrifugal force is generated and rotates the rotating member. The latch bolt includes a receiving portion that contacts a part of the rotating member when the rotating member rotates due to the centrifugal force and prevents the latch bolt from protruding. The door is characterized in that.

Images