Latch lock

Abstract

To prevent a collision sound from being recognized as an unpleasant noise due to the fact that the collision sound is generated between a reversing latch and an inner surface of a latch case when the reversing latch is projected by the force of a spring from a state where the reversing latch is retreated in a latch body.SOLUTION: A latch lock includes: a reversing latch 7 that can advance and retreat from an opening 4 provided in a front end wall 3 of a lock case 2; a spring receiver 9 that is in contact with a rear end of the reversing latch 7; a latch spring 10 connected to the spring receiver 9 and biasing the reversing latch 7 forward; a damper 11 provided with a moving body that exerts a resistance force against the biasing force of the latch spring 10; and a slider 16 that can be detachably connected to the moving body and is connected to the spring receiver 9, wherein the slider 16 is detached from the damper 11 when the spring receiver 9 retracts, and the resistance force is transmitted to the spring receiver 9 by being connected to the damper 11 when the latch spring 10 advances the spring receiver 9.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a latch lock with a reverse latch. [Background technology]

[0002] A latch lock equipped with a reverse latch is a door lock in which the locked and unlocked states of the reverse latch can be switched by operating a push-pull handle, etc. When attempting to open or close a door, the reverse latch is pressed against the door frame and retreats into the latch lock body, allowing the door to be opened and closed, and in the locked state, the retreat mechanism of the reverse latch is locked, allowing the door to be closed to prevent it from opening unexpectedly. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-123488 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when a reversible latch is pressed against a door frame or the like and retracted into the latch body, and the pressing force is released, the latch protrudes forward due to the force of the spring, which has a biasing force, and collides strongly with the inner surface of the latch case, emitting a collision noise that can be perceived as an unpleasant noise.

[0005] In order to reduce such collision noise, it has been proposed, for example in Patent Document 1, to provide a mechanism to reduce the speed at which the reverse latch advances. However, this has the problem of generating greater resistance than conventional mechanisms to the reverse action, which is a characteristic function of the reverse latch. [Means for solving the problem]

[0006] Therefore, as a means for solving the above problem, the latch lock of the present invention comprises a reverse latch that can be advanced and retreated through an opening provided in the front end wall of the lock case, a spring retainer that abuts the rear end of the reverse latch, a latch spring connected to the spring retainer and urging the reverse latch forward, a damper having a moving body that exerts resistance against the urging force of the latch spring, and a slider that can be freely connected to and detached from the moving body and is connected to the spring retainer, wherein the slider detaches from the damper when the spring retainer retreats, and connects to the damper when the latch spring advances the spring retainer, thereby transmitting the resistance force to the spring retainer.

[0007] Here, when the spring receiver moves rearward together with the reversing latch, the connection between the slider and the damper is severed and they are separated from each other, and the force equivalent to the resistance force of the damper has no particular effect on the rearward movement of the reversing latch.

[0008] The spring receiver is pushed backward by the rotation of the reverse latch and moves backward. latch In this case, it is preferable that the spring is compressed by the rear end surface of the reversing latch, the surface of which that faces diagonally forward is reversed between the front end surface and the side surface by rotation.

[0009] Here, when the reversing latch rotates to move the spring receiver rearward, the connection between the slider and the damper is cut off and they are separated from each other, and the force equivalent to the resistance force of the damper has no particular effect on the rearward movement of the spring receiver.

[0010] Here, the positional relationship between the damper and the slider is not particularly limited. For example, the damper may be provided so as to protrude rearward from the rear surface of the latch case, and the moving body may be arranged in a direction in which it is pulled rearward from the damper body. In this case, it is preferable that the slider embraces the rear end of the moving body of the damper from the front and pushes the moving body from rear to front into the damper body, and that the slider is separated from the moving body when the slider moves rearward. Note that, as long as the slider can push the rear end of the moving body forward, the damper body may be arranged forward of the rear end of the latch case.

[0011] As another example of the positional relationship between the damper and the slider, the damper may be disposed at the rear of the latch case, and the movable body may be disposed in a direction in which it is pulled forward from the damper body. In this case, the movable body may be latched from the rear and pulled forward together with the slider when the slider moves forward, and may be released from the latching relationship when the slider moves backward.

[0012] Furthermore, it is preferable that the inner peripheral surface of the opening is made of resin. The inner peripheral surface of the opening can prevent the reverse latch from protruding excessively by engaging the engaging portion of the reverse latch that is about to protrude forward from the opening. In this case, if the inner peripheral surface of the opening is made of resin, the impact sound generated when the reverse latch is engaged can be reduced more than if the inner peripheral surface of the opening is made of metal.

[0013] Furthermore, it is also preferable that the outer edge of the latch receiver into which the reverse latch is inserted is made of resin. If the outer edge of the receiver of the door frame is made of resin, the impact sound generated when the tip surface of the reverse latch abuts against the outer edge when the door is closed can be reduced more than if the outer edge was made of metal. Effect of the Invention

[0014] According to the present invention, it is possible to reduce noise caused by the collision of the reverse latch when protruding from the opening of the lock case.

[0015] Furthermore, according to the present invention, the reversal latch can be rotated without receiving resistance from the damper, thereby allowing the door to be opened and closed without being subjected to load from the damper.

[0016] Furthermore, according to the present invention, when the reverse latch is retracted from the opening, it can be retracted without receiving resistance from the damper, thereby allowing the door to be opened and closed without being subjected to load from the damper. [Brief description of the drawings]

[0017] [Figure 1] 1A and 1B are schematic diagrams showing the entire state in which the locking piece 26 of the latch lock 1 is closed, where (a) is a vertical cross-sectional view and (b) is a horizontal cross-sectional view viewed from the plan direction. [Diagram 2] 1A and 1B are schematic diagrams showing the entire state in which the locking piece 26 of the latch lock 1 is open, where (a) shows a vertical cross-sectional view and (b) shows a horizontal cross-sectional view viewed from the plan direction. [Diagram 3] 2A is a rear view of a spring support 9, FIG. 2B is a plan view, and FIG. [Figure 4] 13 is a perspective view seen from behind, showing the spring receiver 9 combined with the rear end surface 8a of the reverse latch 7, and the state in which the locking piece 26 is closed relative to the reverse latch 7. FIG. [Diagram 5] 1A is a front view, FIG. 1B is a plan view, and FIG. 1C is a side view of the slider 16 combined with the spring receiver 9. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In this specification and the drawings, components having substantially the same functional configurations are denoted by the same reference numerals, and duplicated explanations will be omitted.

[0019] The latch lock 1 of the present invention has a reversible latch 7 that is movable back and forth along a latch case 6 that extends from the inner surface of an opening 4 provided in a front end wall 3 of the lock case 2 toward the inside of the lock case 2.

[0020] As shown in Fig. 4, a spring receiver 9 is disposed at the rear end of the reverse latch 7 in contact with the rear end surface 8a, and the reverse latch 7 is biased forward by a latch spring 10 provided between a spring insertion portion 9a opening at the rear of the spring receiver 9 and the inner surface of the rear end of the latch case 6. In addition, when the reverse latch 7 protrudes from the opening 4, the rear end surface 8a of the reverse latch 7 is formed so as to be perpendicular to the front-rear direction. Note that, at this time, the front end surface of the spring receiver 9 also abuts against the rear end surface 8a of the reverse latch 7, which is preferable because the biasing force of the latch spring 10 can be uniformly transmitted to the reverse latch 7 via the spring receiver 9.

[0021] As shown in Figures 1(a) and 1(b), a damper 11 is installed on the outer surface of the rear end of the lock case 2. The damper 11 comprises a cylinder 12, which is the damper body, and a rod 13, which is a movable body protruding from the rear end of the cylinder 12. The rod 13 is a rod-shaped movable body that moves in and out of the cylinder 12 in the front-rear direction. A resistance force is generated against the movement of the rod 13 by oil or the like filled inside the cylinder 12. In this embodiment, the rear end of the rod 13 is formed into an abutment plate 13a that is expanded radially outward of the rod 13, and is configured so that the pressing force from the pressing wall 17 of the slider 16 can be received by the entire surfaces that abut against each other.

[0022] In this embodiment, the damper 11 is protected by covering the periphery of the cylinder 12 with resin 14, and the resin 14 is fixed from the inside of the lock case 2 with screws 15, thereby fixing the cylinder 12 to the outer surface of the rear end of the lock case 2.

[0023] In this embodiment, when the rod 13 of the damper 11 is not subjected to a pressing force toward the front, it is stationary and protrudes far backward from the cylinder 12. A specific example of this state is the rod 13 in the position indicated by the two-dot chain line in Figs. 2(a) and (b), which may be referred to as a standby state hereinafter. When the rod 13 is subjected to a pressing force from the rear toward the front, it moves toward the inside of the cylinder 12 while exerting a resistance force against the pressing force. In this embodiment, the resistance force exerted by the rod 13 is smaller than the biasing force of the latch spring 10, and when the biasing force of the latch spring 10 is applied, the reverse latch 7 can move forward and protrude from the opening 4 while receiving the resistance force of the damper 11.

[0024] As shown in Fig. 1(a), slider 16 has an arm 18 that extends forward from a pressing wall 17 disposed at the rear of rod 13 and is connected to spring bearing 9. As shown in Fig. 5, arm 18 is connected to spring bearing 9 by inserting a claw 19 provided at the front end of arm 18 into a locking groove 20 (see Figs. 3 and 4) formed on the side of spring bearing 9.

[0025] In this embodiment, when the slider 16 advances together with the spring bearing 9 due to the biasing force of the latch spring 10, the inner surface of the pressing wall 17 comes into contact with the rear end of the rod 13, connecting the slider 16 and the damper 11, and as shown by the rod 13 moving from the two-dot chain line to the solid line along the arrow in Figure 1, the pressing wall 17 can press the rod 13 into the inside of the cylinder 12. At this time, the slider 16 transmits the resistance force of the damper 11 to the spring bearing 9.

[0026] The spring receiver 9, which receives the resistance force of the damper 11 from the slider 16, moves forward due to the biasing force of the latch spring 10, but pushes the reverse latch 7 forward at a speed slower than the speed at which it moves forward due to the biasing force alone.As a result, the sound generated when the locking claw 21 of the reverse latch 7 hits the inner surface 5 of the opening 4 and the forward movement of the reverse latch 7 stops can be reduced more than in the past.

[0027] On the other hand, when the slider 16 retreats, as shown by the positional relationship between the rod 13 and the pressing wall 17 in solid lines in Figs. 2(a) and (b), the pressing wall 17 separates from the rod 13, and the slider 16 retreats in a disconnected state with the damper 11. After that, the rod 13 slowly protrudes backwards, following the pressing wall 17 while receiving the resistance force generated inside the cylinder 12, as shown by the arrows in Figs. 2(a) and (b). This allows the door to be opened and closed without receiving the load from the damper 11. The rod 13 stops when it abuts against the pressing wall 17 at a certain position. Also, when the slider 16 retreats sufficiently, the rod 13 stops by entering a standby state. In the standby state, the rod 13 and the slider 16 may be in abutment with each other, or there may be a gap between the rod 13 and the pressing wall 17.

[0028] In this embodiment, when the reverse latch 7 rotates, the rear end surface 8a of the reverse latch 7 also rotates in a direction inclined obliquely backward with respect to the front-rear axis direction, as shown in Fig. 2(b), thereby pushing the spring receiver 9 backward. At this time, when the slider 16 moves backward, the slider 16 disengages from the damper 11, so that the reverse latch 7 can be rotated without receiving resistance from the damper 11. As a result, even when the door 24 is opened by rotating the reverse latch 7 while pressing the side surface 8c of the reverse latch 7 against the frame edge portion 44 of the latch receiver 43, the door can be opened without receiving load from the damper 11.

[0029] 1(a) and (b), in this embodiment, a lock cover 22 is provided which covers the lock case 2, damper 11, and slider 16. The lock cover 22 protects the operating mechanism of the slider 16 from being hindered by external impacts, etc. In addition, the upper and lower extensions of the front end wall 3 of the lock case 2 can be fixed to a door 24 to attach the latch lock 1.

[0030] As shown in FIG. 4, the locking claws 21 protruding from the top and bottom of the reversing latch 7 are provided with a lock groove 25 which is a groove formed along the front-rear direction.

[0031] 1(a), an upper piece 27 and a lower piece 28 constituting the locking piece 26 are formed from the rear side of the latch case 6 as a pair of curved upper and lower plate-like bodies, respectively, and extend to the upper and lower surfaces of the latch case 6. The tips of the upper piece 27 and the lower piece 28 are formed into plate-like engaging pieces 29, 29 that can engage with the locking groove 25, respectively.

[0032] The upper piece 27 is supported by a support shaft 30 at the upper rear position of the latch case 6 so as to be rotatable relative to the lock case 2. The lower piece 28 is supported by a support shaft 31 at the lower rear position of the latch case 6 so as to be rotatable relative to the lock case 2.

[0033] Furthermore, the upper piece 27 and the lower piece 28 overlap each other at the rear side of the latch case 6, and a connecting hole 32 is formed at the overlapping position. A connecting pin 33 is inserted into the connecting hole 32, and the upper piece 27 and the lower piece 28 are pivotally connected to each other so that they can rotate. The connecting pin 33 can move back and forth, and by moving the connecting pin 33, the upper piece 27 and the lower piece 28 are simultaneously rotated, so that the open / closed state of the locking piece 26 can be switched as shown in FIG. 2.

[0034] As shown in FIG. 1(a), a release plate 34 formed long in the vertical direction is disposed behind the locking piece 26. The release plate 34 is pivotally supported at its lower end by a support shaft 35 relative to the lock case 2. The lower piece 28 constituting the locking piece 26 is formed with a long hole 23 formed in a connecting plate portion extending rearward from the support shaft 31. The connecting plate portion is disposed so that the long hole 23 overlaps with the release plate 34, and the lower piece 28 and the release plate 34 are connected between the support shaft 31 and the support shaft 35 by a connecting pin 36 inserted through the long hole 23 so that their lower halves are pivotally connected to each other. The front end of a holding arm portion 37 extending upward from the support shaft 35 in the release plate 34 is formed into a handle lever abutment portion 38 bent forward. A spring 39 is provided which is wound around the support shaft 35 and biases the space between the inner surface of the rear end of the lock case 2 and the handle lever abutment portion 38 in a direction to widen the gap, so that the release plate 34 is subjected to a force moving forward by the spring 39. When the release plate 34 moves forward by the spring 39, the connecting pin 36 moves downward, causing the lower piece 28 to rotate clockwise and moving the connecting pin 33 rearward. When the connecting pin 33 moves rearward, the locking piece 26 opens. Note that the connecting pin 36 moves up and down due to the action of the release plate 34 and also moves slightly forward and backward, but the movement of the connecting pin 36 is permitted because the connecting pin 36 is inserted into the long hole 23.

[0035] In this embodiment, the rear end of the upper piece 27 constituting the locking piece 26 is provided with a handle lever abutment portion 40 that is bent forward. A spring 41 is provided that is wound around the support shaft 30 and biases the locking piece 26 in a direction that widens the gap between the inner surface of the upper end of the lock case 2 and the handle lever abutment portion 40, so that the locking piece 26 receives a force from the spring 41 that moves the connecting pin 33 rearward. When the connecting pin 33 moves rearward, the locking piece 26 opens, as shown in FIG. 2(a), and the reverse latch 7 becomes rotatable within the latch case 6.

[0036] When the door 24 is closed, as shown in Figures 2(a) and (b), the reverse latch 7 is inserted into the latch receiver 43 provided on the door frame 42. When the door 24 is opened, as shown in Figure 2(a), by operating the push-pull handle H, the handle lever 45a or the handle lever 45b inserted from the push-pull handle H toward the inside of the lock case 2 moves the handle lever abutment portion 38 or 40 to make the reverse latch 7 rotatable and starts the door-opening operation of the door 24.

[0037] When the door 24 starts to open, as shown in FIG. 2(b), the side surface 8c of the reverse latch 7 abuts against the frame edge 44 of the latch receiver 43 and reverses so that the side surface 8c faces diagonally forward. Meanwhile, the rear end surface 8a of the reverse latch 7 faces diagonally backward and slightly pushes the spring receiver 9 backward. The spring receiver 9 pushed backward compresses the latch spring 10. Furthermore, when the door 24 opens, the reverse latch 7 is pushed into the latch case 6 by the frame edge 44. At this time, the slider 16 leaves the damper 11 and moves backward, allowing the reverse latch 7 to rotate and move into the latch case 6 without receiving resistance from the damper 11.

[0038] When the reversing latch 7 passes over the latch receiver 43 and the door 24 is opened, the spring receiver 9, which receives the urging force from the compressed latch spring 10 in the forward direction, presses the rear end surface 8a of the reversing latch 7 facing diagonally backward in the forward direction, thereby rotating the reversing latch 7 in the reverse direction, returning it to the normal state shown by the solid line in Fig. 4 from the reversed state shown by the two-dot chain line in Fig. 4. At this time, the slider 16 connected to the spring receiver 9 also moves forward due to the reverse rotation of the reversing latch 7. The pressing wall 17 of the slider 16, which tries to move forward, tries to move while abutting against the rod 13, as shown in Figs. 1(a) and (b), and receives a resistance force from the damper 11.

[0039] The spring receiver 9, which receives the resistance force of the damper 11 from the slider 16, pushes the reverse latch 7 forward at a slower speed than the speed at which it advances due to the biasing force of the latch spring 10 alone, thereby slowing down the speed at which the reverse latch 7 rotates in the reverse direction. This makes it possible to reduce the sound generated when the inner surface of the latch case 6 hits the side surface 8c of the reverse latch 7 when the reverse latch 7 returns to the normal state.

[0040] Furthermore, when the push-pull handle H of the open door 24 is released, the locking piece 26 closes and the engagement piece 29 enters the latch case 6 through the slits 6a, 6a formed through the upper and lower walls of the latch case 6. When the reversing latch 7 rotates in the opposite direction to return to the normal state, the engagement piece 29 fits into the lock groove 25, restricting the rotational movement of the reversing latch.

[0041] The reversing latch 7, which has rotated in the opposite direction and returned to its normal state, is pushed further forward together with the spring receiver 9 by the biasing force of the latch spring 10. At this time, the slider 16 connected to the spring receiver 9 also moves forward. As the slider 16 moves forward, the pressing wall 17 of the slider 16 receives a resistance force from the damper 11 as it moves while abutting against the rod 13, as shown in Figures 1(a) and (b).

[0042] The spring receiver 9, which receives the resistance force of the damper 11 from the slider 16, pushes the reverse latch 7 forward at a slower speed than the speed at which it advances due to the biasing force of the latch spring 10 alone, so that the noise generated when the locking claw 21 of the reverse latch 7 hits the inner surface 5 of the opening 4 and the forward movement of the reverse latch 7 stops can be reduced more than ever before. Also, by forming the inner surface 5 of the opening 4 from a resin material instead of metal, the collision noise between the locking claw 21 of the reverse latch 7 and the inner surface 5 of the opening 4 can be further reduced.

[0043] The opened door 24 then closes again toward the door frame 42, but at this time, the front end surface 8b of the reverse latch 7 protruding from the opening 4 facing diagonally forward is pressed against the outer edge 44a of the frame edge portion 44 of the latch receiver 43, so that the reverse latch 7 is pushed into the latch case 6 in the normal state. At this time, the locking piece 26 is closed, and the engagement piece 29 is fitted into the lock groove 25 of the locking claw 21, restricting the rotation of the reverse latch 7. On the other hand, since the lock groove 25 is released in the front-rear direction, the reverse latch 7 can move backward while aligning the engagement piece 29 with the lock groove 25 and retreat into the latch case 6.

[0044] At this time, since the outer edge 44a of the frame edge portion 44 is made of resin, it is possible to reduce the collision noise between the reverse latch 7 protruding from the opening 4 and the latch receiver 43 when the door is closed.

[0045] When the door 24 is closed, the reverse latch 7 is inserted into the latch receiver 43 by the biasing force of the latch spring 10. However, even at this time, the reverse latch 7 slowly protrudes from the opening 4 due to the resistance force of the damper 11 by the slider 16, thereby reducing the collision noise between the locking claw 21 and the inner surface 5 of the opening 4. [Explanation of symbols]

[0046] 1 Latch lock 2 Tablet Case 3 Front end wall 4 aperture 6 Latch Case 7 Inverting Latch 9 Spring support 10 Latch spring 11 Damper 16 Slider 24 Doors 26 Locking Piece 42 Door Frame 43 Latch receiver H Push-pull handle

Claims

1. a reversible latch that can be advanced or retreated through an opening provided in a front end wall of the lock case; a spring receiver abutting against a rear end of the reverse latch; a latch spring connected to the spring receiver and biasing the reverse latch forward; a damper having a movable body that exerts a resistance force against the biasing force of the latch spring; a slider that is detachably connectable to the moving body and is connected to the spring bearing; The slider is separated from the damper when the spring bearing retracts, and is connected to the damper when the latch spring advances the spring bearing, thereby transmitting the resistance force to the spring bearing. A latch lock characterized by:

2. The spring receiver is pushed backward by the rotational movement of the reverse latch and compresses the latch spring.

2. The latch lock according to claim 1.

3. The inner surface of the opening is made of resin.

2. The latch lock according to claim 1.

4. The outer edge of the latch receiver into which the reverse latch is inserted is made of resin. A latch lock according to any one of claims 1 to 3.

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