JP2012052385A - Latch lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems of the prior art and to easily incorporate a rotation control damper member in a latch lock.SOLUTION: For the latch lock, the rotation control damper member whose braking force is different depending on a rotating direction is disposed inside a lock box. The rotation control damper member includes: a case fixed inside the lock box; a pinion gear fixed to the projected distal end part of a torque shaft of a rotor equipped inside the case and engaged with a gear part provided on the concentric circle of a shaft hole of a retractor; a blade for rotation control provided on the rotor; and a highly viscous substance filled in the case. When an operation member is returned to an initial position, the viscous resistance of the highly viscous substance to the blade for rotation control becomes larger than that when the operation member is operated in the direction of pulling back a latch bolt.

Description

  The present invention relates to a latch lock provided with a rotation control damper member for reducing a collision sound such as a metal sound generated when a latch bolt is fully projected.

  First, Patent Document 1 states that “a pinion meshes with a rack gear train of a latch bolt of a latch lock, and a rotation control damper member containing a high-viscosity substance is arranged in a bearing case fixed to the lock box. And a latch bolt silencer that reduces the collision noise generated when the latch bolt protrudes using the viscous resistance of the high-viscosity substance.

  By the way, the latch bolt silencer in this latch lock includes, for example, a retractor (rotating body for pulling back the latch bolt) that rotates in a predetermined direction by the operating force of the lever handle and against the spring force of the return spring, and the rotation of the retractor. The latch bolt that moves backward against the spring force of the latch spring for latch return and the moment when the lever handle is released, the latch bolt protrudes completely from the lock box by the spring force of the latch spring for latch return. At the same time, in the latch lock in which the lever handle is automatically returned to the initial position by the spring force of the return spring, the noise reducing member for reducing the collision noise caused by the latch bolt when the latch bolt is moved (Rotation control damper member) is disposed in the lock box, and the sound deadening member moves forward and backward with respect to the door frame side receiving tool. A rack gear train formed or provided on the upper side of the latch bolt, a pinion gear that is always meshed with the rack gear train, and a pinion gear that is connected to the pinion gear via a torque shaft and rotates against the viscous resistance of a high-viscosity substance. It consists of a rotating body and the like.

  However, the silencing member of Patent Document 1 generates equal viscous resistance in any rotation direction when the viscous resistance of the highly viscous substance rotates in the clockwise direction and in the counterclockwise direction, respectively. It is unclear whether or not one rotation has higher viscous resistance than the other rotation.

  In addition, since the damper function is a rack and pinion gear, there is a problem that the rack needs to be processed precisely, the entire device becomes large and the limited space in the lock box cannot be used effectively. .

  Next, the rotation control damper member described in Patent Document 2 is provided at the bottom of the rotor 20 so as to be displaced depending on the rotor 20 integrally provided at the base end of the torque shaft 10 and the rotation direction of the rotor. It comprises a rotation shaft blade (oscillating blade) 23 for a torque shaft provided and a highly viscous material 50 filled in a case 40 that can be fixed to a stationary member. For example, when an opening / closing body of an electronic device opens and closes The rotation control blade (oscillating blade) 23 is displaced to reduce the viscous resistance of the highly viscous substance (first damping force), and the viscous resistance of the highly viscous substance is greater than the first damping force. It is described that there is a mode of increasing (second damping force) (the reference numeral is that of Patent Document 2).

  Although this Patent Document 2 has a description that it can be carried out when a “large damping force” is required only for rotation in one of the forward and reverse directions (paragraph 0030), the rotation control damper member is described as “ There is no description that it can be applied to “a silencer for a latch bolt in a latch lock”.

  Furthermore, the directional rotor damper described in Patent Document 3 is “an outer cylindrical casing portion 3 fixed to a fixed member, and an inner casing and a cylindrical casing portion that are externally displaceable. The disk-shaped drive shaft portion 1 and the inner cylindrical follower portion 2 having the rotation control blades 7 and a highly viscous material filled in the internal space of the housing portion 3, the drive shaft portion 1 being torque When rotating in one direction in cooperation with the shaft 5, the drive shaft portion 1 rotates the driven portion 2 against the viscous resistance of the high-viscosity substance via the rotation control blade 7 that expands and displaces. On the other hand, when the drive shaft portion 1 rotates in the opposite direction, the rotation control blade 7 is displaced inward to idle in the driven portion 2. The direction described in Patent Document 3 The rotary rotor damper provides rotational braking only in one direction.

  Although the directional rotor damper described in Patent Document 3 can be implemented when a “large damping force” is required only for rotation in one of the forward and reverse directions, as in Patent Document 2, There is no description that the directional rotary damper can be applied to “a silencer for a latch bolt in a latch lock”.

JP-A-9-151653 JP 2001-254772 A JP-A-6-294430

  An intended object of the present invention is to provide a latch lock having a rotation control damper member that reduces a collision sound generated when the latch bolt is fully projected. For example, when the lever handle as an operation member is pushed down (the latch bolt is When the lever handle is retracted into the lock box), the lever control brake is not applied to the lever handle as much as possible, or is not applied at all. However, when the lever handle returns to the initial position, the brake control protrusion or rotation A large braking force (a large damping force) of the rotation control damper member having the control blade is applied to the lever handle, so that the collision noise can be reduced (silenced). The second purpose is the problem that the patent document 1 had, such as the need to precisely process the rack, the fact that the entire device becomes large and the limited space in the lock box cannot be used effectively. It is to eliminate the point. The third object is that the rotation control damper member can be easily incorporated into the lock box. Another object is that the rotor and the torque engaging body constituting the rotation control damper member operate smoothly and reliably.

  The latch lock of the present invention is a retractor that rotates in a predetermined direction by the operating force of the operating member and against the spring force of the return spring, and moves backward by the rotational force of the retractor and against the spring force of the latch spring for latch return. Latch bolt, and at the moment when the operation member is released, the latch bolt protrudes from the lock box by the spring force of the latch return latch spring, and at the same time, the operation member also returns to the initial position by the spring force of the return spring. In this case, a rotation control damper member having a different braking force depending on the rotation direction is disposed in the lock box, and the rotation control damper member includes a case fixed in the lock box and a torque of a rotor built in the case. A pinion gear fixed to the projecting tip of the shaft and meshing with a gear portion provided on a concentric circle of the shaft hole of the retractor, and provided on the rotor A rake control projection (for example, a control projection having a brake surface on one side) or a rotation control blade and a high-viscosity material filled in the case, the rotation control when the operating member returns to the initial position. The viscous resistance of the high-viscosity substance with respect to the blades is larger than when the operation member is operated in a direction in which the latch bolt is pulled back.

  The latch lock of the present invention is a retractor that rotates in a predetermined direction by the operating force of the operating member and against the spring force of the return spring, and by the rotational force of the retractor and against the spring force of the latch spring for latch return. At the moment when the latch bolt that moves backward and the operation member is released, the latch bolt protrudes from the lock box by the spring force of the latch spring for returning the latch, and at the same time, the operation member returns to the initial position by the spring force of the return spring. In the latch lock, a one-way rotation control damper member that generates a braking force depending on the rotation direction is disposed in the lock box. The one-way rotation control damper member includes a case fixed in the lock box, and a brake It is fixed to the projecting tip of the torque shaft of the rotor having a control projection or rotation control blade and meshes with a gear portion provided on a concentric circle of the shaft hole of the retractor And a high-viscosity material that fills the case and gives resistance to the brake control protrusions or rotation control blades of the rotor, and when the operating member returns to the initial position, When the torque engaging body incorporated in the recess of the rotor rotates in cooperation, a resistance of a highly viscous substance acts on the brake control protrusion or the rotation control blade, and the latch bolt When the operating member is operated in the retracting direction, the torque engaging body is idled with respect to the rotor.

  In the above configuration, the rotor is a driven rotor, and a recess is formed on one side surface of the rotor, and ratchet teeth are formed along the circumferential direction on the bottom surface of the inner wall of the recess. Torque engaging bodies each having an elastic arcuate wedge part that can be expanded and displaced so as to be in pressure contact with an inner peripheral wall orthogonal to the bottom surface of the inner wall and an engaging claw that engages and disengages the ratchet teeth at the tip of the arcuate wedge part Is incorporated in the recess. In addition, a positioning fitting hole is formed in the wide side wall of the lock box, and the case of the one-way rotation control damper member is provided in a state in which one end portion of the case is fitted into the fitting hole. It is fixed to the said wide side wall through the flange part which was made.

(A) For example, when the lever handle as the operation member is pushed down (when the latch bolt is retracted into the lock box), the rotation control damper member is not applied to the lever handle as much as possible, or is not applied at all. When the handle returns to the initial position, a large braking force (a large damping force) of the rotation control damper member is applied to the lever handle, so that the collision noise can be reduced (silenced).
(B) The problems of Patent Document 1 can be solved.
(C) In the invention according to claim 2, since the case of the rotation control damper member is fixed to the inner wall surface of the case body, the pinion gear of the rotation control damper member can be easily used as the gear portion of the retractor (rotator for pulling back the latch bolt). Can be engaged.
(D) The invention according to claim 3 can obtain the same effect as that of the invention according to claim 1.
(E) In the invention according to claim 4, when the torque engaging body incorporated in the recess of the driven rotor rotates smoothly in one direction and rotates in the other direction, Since the engaging claw is securely locked to the ratchet teeth of the recess and an outward expansion action occurs on the entire arcuate wedge portion (circumferential contact portion), a force is concentrated on the engaging claw. The arcuate wedge portion is pressed against the inner peripheral wall of the driven rotor so that the arc does not act. Therefore, the driven rotor that rotates in cooperation with the torque engaging member rotates while receiving the viscous resistance of a highly viscous substance such as grease or silicone oil.

1 to 10 are explanatory views showing a first embodiment of the present invention. 11 to 13 are explanatory views showing a second embodiment of the present invention.
Schematic explanatory drawing which shows the environment of 1st Embodiment. FIG. 2 is a schematic cross-sectional explanatory diagram taken along line 2-2 in FIG. 1. 3-3 schematic cross-sectional explanatory drawing of FIG. Explanatory drawing of the principal part (a retractor and a return spring). Schematic explanatory drawing seen from the rear side of a lock box. Schematic explanatory drawing (initial state) of the principal part in FIG. 1. Schematic explanatory drawing of the main part in FIG. 1 (state where a latch bolt and an operation member return). Schematic cross-sectional explanatory drawing of a rotation control damper member. Explanatory drawing of a rotor. Explanatory drawing of the principal part of a rotation control damper member. Schematic explanatory drawing which shows the environment of 2nd Embodiment. Explanatory drawing which shows the internal structure of a rotation control damper member. Schematic cross-sectional explanatory drawing of a rotation control damper member.

(1) Environmental Member / Prerequisites of the Present Invention FIG. 1 is a schematic explanatory view showing an environmental member of the present invention. In this figure, 1 is a door frame, 2 is a receiver fixed to the door frame, and the receiver 2 has a trojoke and a strike plate as is well known.
On the other hand, X is a latch lock provided at the free end of the door 3, and the lock box 4 constituting the latch lock X is fixed to the door 3 with screws or the like. The lock box 4 includes a case body 4 a having a front 5 and a case lid 4 b fixed to the case body, and is incorporated in, for example, the mouth of the door 3. Reference numeral 6 denotes a dead bolt provided in the lock box 4 so as to freely move in and out. Reference numeral 7 denotes a dharma (rotary driving body) having a driving arm that selectively engages with an inclined engaging portion at a rear end portion of the dead bolt. In addition, a click means (not shown) is disposed in the lock box 4, and a click spring constituting the click means selectively biases the dead bolt in a protruding direction and a retracting direction (well-known matter). .

  The main part constituting the latch lock X of the present invention is disposed between the dead bolt 6 and the bottom wall of the lock box 4. First, reference numeral 11 denotes a retractor that is rotatably provided in the vicinity of the lower right corner of the lock box 4. The retractor 11 is operated by an operating force of an operating member 12 (a lever handle in this embodiment) such as a lever handle or a knob. And it rotates in a predetermined direction against the spring force of the return spring 13. A specific structure of the retractor 11 will be described later.

  Next, reference numeral 15 denotes a latch bolt that moves backward by the rotational force of the retractor 11 and against the spring force of the latch spring 16 for returning the latch. The latch bolt 15 is provided on the front side and the rear side provided in the lock box. It is guided in the horizontal direction via the guide members 17a and 17b. The latch bolt 15 has, for example, a block-shaped latch engaging portion 15b that engages with and disengages from the receiving member 2 of the door frame 1 at the tip of the rod-shaped rod 15a, and a flange-shaped receiving portion at the rear end of the rod-shaped rod 15a. 15c, a spring end support portion 15d, and a stopper portion 15e that can come into contact with the guide member 17b located rearward.

  In the above-described configuration, the fingertip-like protruding engaging portion 11a of the retractor 11 is always engaged with the receiving portion 15c of the latch bolt 15, so that the handle portion of the lever handle 12 for opening and closing the door 3 is pushed down. Then, the retractor 11 rotates by a predetermined amount in the clockwise direction against the spring force of the return spring 13 through the angular shaft 18 connected to the shaft portion of the lever handle 12. Then, the latch bolt 15 moves backward into the lock box 4.

  On the other hand, when the lever handle 12 is released, at the moment, the latch bolt 15 protrudes from the lock box 4 by the spring force of the latch return latch spring 16 and at the same time the lever handle 12 spring force of the return spring 13. To return to the initial position. At this time, since the spring force of the return spring 13 of the lever handle 12 is generally “strongly set”, the retractor 11 also rotates vigorously counterclockwise.

  Thus, when the latch bolt 15 and the lever handle 12 are automatically returned to the initial positions, the contact surfaces of the respective members (for example, the collision surface between the guide member 17b and the stopper portion 15e, the fingertip shape of the guide member 17b and the retractor 11). A collision sound made of metal caused by the protrusion of the latch bolt 15 is generated from the collision surface with the protrusion engaging portion 11a. Therefore, in this embodiment, a rotation control damper member 21 that reduces a collision sound generated due to the latch bolt 15 when the latch bolt 15 is fully projected is provided in the lock box 4.

(2) Main part First, the specific structure of the retractor 11 is demonstrated. The retractor 11 is rotatably provided in the lower right space defined by the bottom wall and the rear wall of the lock box 4 as described above, and has a rectangular shaft hole 19 as shown in FIG. No. latch hub, a plurality of engaging protrusions 11a, 11b, 11c extending radially outward from the latch hub, and a gear portion (spur gear portion) provided on a concentric circle of the shaft hole 19 for the square shaft ) 20.

  Thus, the first engaging protruding piece portion 11a is always engaged with the receiving portion 15c of the latch bolt 15, and depending on the embodiment, in the opposite direction to the first engaging protruding piece portion 11a. The protruding second engaging protruding piece portion 11b can be brought into contact with a stopper 8 which is also used as a spring end column fixedly provided near the bottom wall of the lock box 4, and further, the first engaging protruding piece portion 11a. On the other hand, the third engaging protruding piece portion 11 c that protrudes slightly wider downward holds the one end portion 13 a of the return spring 13.

  The gear portion (spur gear portion) 20 meshes directly or indirectly with the pinion gear 27 of the rotation control damper member 21 as shown in FIG. The other end 13b of the return spring 13 is locked to the stopper 8 described above. In this embodiment, the stopper 8 is fitted with a short cylindrical synthetic resin sound reducing cylinder 9.

  Next, the rotation control damper member 21 is disposed in the space on the front 5 side of the lock box 4 with respect to the retractor 11 and below the bar-shaped rod 15a with respect to the retractor 11. Therefore, the rotation control damper member 21 includes, for example, a plurality of fixing tools 22 and 22 and an unnumbered protruding piece-like mounting portion on the inner wall of the case lid 4b of the lock box 4 as shown in FIGS. A cylindrical case 23 with a bottom having one end opening fixed through a fitting hole of the case lid 4b, and a protruding tip portion of a torque shaft 25 of a rotor 24 rotatably mounted in the cylindrical case 23 are fixed. And the pinion gear 27 meshed with or without the gear portion (spur gear portion) 20 of the retractor 11 and the intermediate gear 26, and the rotor 24 so as to be displaced inward and outward depending on the rotational direction of the rotor 24. A space portion between a rotation control blade 28 provided in a notch-like recess 32 formed in a bottom portion of the rotor through a flexible connection portion 28a, and an inner wall bottom surface of the cylindrical case 23 and a bottom surface of the rotor 24 Filled with high Consisting of sexual material 29..

  8 to 10, reference numeral 30 denotes a lid that closes one end opening of the cylindrical case 23, and the torque shaft 25 of the rotor 24 described above passes through the shaft hole at the center of the lid 30. . Reference numeral 31 denotes a bottom-up center protrusion provided at the center of the bottom of the rotor 24, and the center protrusion 31 is in sliding contact with the center of the bottom surface of the inner wall of the cylindrical case 23. Further, reference numeral 32 denotes one or a plurality of notch-like recesses formed at appropriate locations on the peripheral end portion of the bottom of the rotor 24. One end portion of the rotation control blade 28 is provided at an appropriate location on the inner wall surface of the notch-shaped recess 32. Is integrally provided on the rotor 24 via the flexible connection portion 28a, and the inclined brake surface 28b is provided at the free end of the rotation control blade 28 corresponding to the opposite side of the flexible connection portion 28a. Is formed. The rotation control blade 28 may be a control projection having a brake surface 28b on one side. The number and shape of the control protrusions and rotation control blades 28, and whether the rotor 24 is fixed or movable with respect to the outer surface of the bottom or the peripheral wall are design changes.

  The rotation control damper member 21 configured as described above, for example, frees the rotation control blade 28 when the operation member 12 is rotated in the direction in which the latch bolt 15 is inserted into the lock box 4 against the spring force of the return spring 13. Since the end portion is displaced to the bottom surface side of the inner wall surface of the notch-shaped recess 32, a small torque (first damping force) is generated by the viscous resistance of the high-viscosity substance 29 built in the cylindrical case 23. On the other hand, when the hand is released from the operation member 12 and the latch bolt 15 automatically protrudes completely from the lock box 4 by the spring force of the latch spring 16, the free end of the rotation control blade 28 is in the notch-shaped recess 32. Since it is away from the bottom surface side of the wall surface, a torque (second damping force) larger than the first damping force is generated by the viscous resistance of the highly viscous material 29.

  Therefore, when the operation member 12 returns to the initial position (for example, when the operation member 12 changes from the inclined state to the horizontal state as shown in FIG. 7), the “large braking (damping force)” is applied, so And move forward.

  In this section, the latch lock X1 of the second embodiment of the present invention will be described. Similarly to the first embodiment, the rotation control damper member 21A of the latch lock X1 is located in the space on the front 5 side of the lock box 4 with respect to the retractor 11 and below the rod-shaped rod 15a. It is arranged.

  However, the main difference between the latch lock X1 and the latch lock X of the first embodiment is that (a) the pinion gear 27 of the rotation control damper member 21A directly meshes with the gear portion 20 of the retractor 11, (b ) Specific configuration of the rotation control damper member 21A, (c) and the operation of the rotation control damper member 21A.

  FIG. 11 shows that the one-way rotation control damper member 21 </ b> A is directly meshed with the pinion gear 27 of the retractor 11. 12 and 13 show the specific configuration and operation of the one-way rotation control damper member 21A. In these drawings, the same (similar) configurations as those in the first embodiment are denoted by the same or similar reference numerals, and redundant description is omitted.

  First, 23A is a cylindrical case with a bottom, 24A is a driven rotor rotatably mounted in the cylindrical case, and 25A is a recess formed on one side surface of the driven rotor 24A depending on the rotation direction. A torque engaging body 25 that is independently rotatable, 25 is a torque shaft that is provided at the center of the torque engaging body 25 </ b> A and penetrates the lid body 30, and 27 is fixed to the projecting tip of the torque shaft 25 and the retractor 11. A pinion gear 27 that directly meshes with the gear portion (spur gear portion) 20.

  Thus, the one-way rotation control damper member 21A forms a recess 41 on one side surface (upper surface in FIG. 13) of the driven rotor 24A, and a ratchet along the circumferential direction on the inner wall bottom surface of the recess 41. An elastic arcuate wedge portion a that forms teeth 42 and can be expanded and displaced so as to be in pressure contact with an inner peripheral wall 43 perpendicular to the bottom surface of the inner wall of the recess 41, and the ratchet at the tip of the arcuate wedge portion a A torque engagement body 25A having engagement claws b that engage with and disengage from the teeth 42 is incorporated.

  In the above configuration, when the operating member 12, for example, the handle portion of the lever handle is pushed down and the latch bolt 15 is operated in the direction of pulling back, the torque engaging body 25A integral with the torque shaft 25 (cooperating with the torque shaft 25) Since the engaging claw b passes over each tooth of the ratchet teeth 42 while sliding, the torque engaging body 25A is in an idle state (idle) with respect to the driven rotor 24A. Therefore, the braking (load) of the rotation control damper member 21A is not applied to the operation of the operation member 12.

  On the other hand, when the operating member 12 is released and the operating member 12 returns to the initial position, the two engaging claws b of the torque engaging body 25A are locked to the ratchet teeth 42. An outwardly expanding displacement action is generated on the entire wedge part a, the arcuate wedge part a is pressed against the inner peripheral wall 43 of the driven rotor 24A, and a frictional resistance is generated therebetween.

  As a result, the torque engagement body 25A and the driven rotor 24A rotate together in cooperation. At that time, the viscous resistance of the high-viscosity material 29 with respect to the driven rotor 24A is caused by one or a plurality of brake control protrusions 28A (or rotation control blades as in the first embodiment) formed on the bottom of the driven rotor 24A. It is generated as a “relatively large damping force” so as to reduce the impact sound.

  As described above, according to the present invention, when the operation member 12 returns to the initial position, the rotation control blade 28 of the rotor 24 or the brake control projection 28A of the driven rotor 24A has the viscous resistance of the high-viscosity material 29 described above. Positioning the operating member 12 in the rotational direction of the torque shaft 25 so that the position of the operating member 12 is displaced in the required direction (projecting direction) so that it becomes larger than when the latch bolt 15 is operated in the direction of pulling back or a relatively large damping force is generated Due to the displacement, the intended purpose of the invention can be achieved.

  In the second embodiment, the recess (torque engagement body) of the driven rotor faces the bottom surface of the inner wall of the cylindrical case even when the torque engagement body is in an idle state with respect to the rotor. In the case where the driven rotor, the torque engaging body, and the like are combined with the cylindrical case in the opposite manner, the resistance of the high-viscosity material 29 is somewhat affected even when the lever handle 12 is operated in the downward direction. Of course, combinations of these members are possible without departing from the object of the invention. In addition, when the rotation control blade 28 as in the first embodiment is provided in the driven rotor 24A instead of the single or plural brake control projections 28A, the connection portion of the rotation control blade 28 is a flexible connection portion. Instead of 28a, for example, it is possible to connect with a configuration of a shaft and a shaft hole. Therefore, the configuration of the connection portion of the rotation control blade 28 is not an essential matter of the invention.

  Further, both the rotation control damper member 21 of the first embodiment and the one-way rotation control damper member 21A of the second embodiment are formed with a positioning fitting hole 10 on the wide side wall of the lock box 4, and the one-way rotation control damper. The case 23 of the member is in a state where one end portion of the case is fitted in the fitting hole 10 and has flange portions 23 a and 23 a having an unnumbered attachment hole projecting from the case, and a plurality of fixing tools 22. And fixed to the wide side wall (characteristic).

  The present invention is used in the fields of locks and joinery.

X, X1 ... Latch lock, 1 ... Door frame, 2 ... Receiver, 3 ... Door, 4 ... Lock box, 4b ... Case lid, 8 ... Stopper, 9 ... Sound reduction cylinder, 10 ... Fitting hole, 11 ... Retractor 11a, 11b, 11c ... engagement projecting piece portion, 12 ... operating member, 13 ... return spring, 15 ... latch bolt, 15a ... rod-shaped rod, 15b ... latch engaging portion, 15c ... receiving portion, 16 ... for latch return Latch spring, 17a, 17b ... guide member, 18 ... square shaft, 19 ... shaft hole, 20 ... gear part (spur gear part), 21, 21A ... rotation control damper member, 22 ... fixing tool, 23, 23A ... case, 23a ... Flange portion, 24 ... rotor, 24A ... follower rotor, 25 ... torque shaft, 25A ... torque engagement body, 27 ... pinion gear, 28 ... rotation control blade, 28a ... flexible connection, 28b ... projection end Brake surface, 28A ... Brake Control projection, 29 ... High viscosity material, 30 ... Lid, 31 ... Center projection, 32 ... Notch-shaped recess, 41 ... Recess, 42 ... Ratchet tooth, 43 ... Inner peripheral wall, a ... Arc wedge part, b ... Engagement The nail.

Claims (5)

A retractor that rotates in a predetermined direction by the operating force of the operating member and against the spring force of the return spring, a latch bolt that moves backward by the rotating force of the retractor and against the spring force of the latch spring for latch return, and the operating member At the moment when the hand is released, the latch bolt protrudes from the lock box by the spring force of the latch return latch spring, and at the same time the operating member is returned to the initial position by the spring force of the return spring. Rotation control damper members with different braking forces are arranged in the lock box, and the rotation control damper members are fixed to the case fixed in the lock box and the protruding tip of the torque shaft of the rotor housed in the case. And a pinion gear meshing with a gear portion provided on a concentric circle of the shaft hole of the retractor, a brake control projection provided on the rotor, Comprises a rotation control blade and a highly viscous material filled in the case. When the operation member returns to the initial position, the viscous resistance of the high viscosity material with respect to the rotation control blade is determined by the latch bolt. A latch lock characterized by being larger than when the operation member is operated in the pull-back direction. The latch lock according to claim 1, wherein the rotation control damper member is incorporated into the gear portion of the retractor in the lock box in a state of being fixed to the inner wall of the case lid. A retractor that rotates in a predetermined direction by the operating force of the operating member and against the spring force of the return spring, a latch bolt that moves backward by the rotating force of the retractor and against the spring force of the latch spring for latch return, and the operating member At the moment when the hand is released, the latch bolt protrudes from the lock box by the spring force of the latch return latch spring, and at the same time the operating member is returned to the initial position by the spring force of the return spring. A one-way rotation control damper member for generating a braking force is arranged in the lock box, and the one-way rotation control damper member has a case fixed in the lock box and a brake control protrusion or a rotation control blade. A pinion gear fixed to the projecting tip of the torque shaft of the rotor and meshing with a gear portion provided on a concentric circle of the shaft hole of the retractor; A high-viscosity material that fills the rotor and provides resistance to the brake control protrusions or rotation control blades of the rotor, and when the operating member returns to the initial position, the rotor and the rotor recesses When the torque engaging body incorporated in the place rotates together, a resistance of a high-viscosity substance acts on the brake control protrusion or the rotation control blade, and the latch bolt is retracted in the direction. A latch lock, wherein when the operation member is operated, the torque engaging body is in an idle state with respect to the rotor. 4. The rotor according to claim 3, wherein the rotor is a driven rotor, and a recess is formed on one surface of the rotor, and ratchet teeth are formed along the circumferential direction on the bottom surface of the inner wall of the recess. A torque engagement member having an elastic arcuate wedge portion that can be expanded and displaced so as to be in pressure contact with an inner peripheral wall perpendicular to the bottom surface of the inner wall, and an engaging claw that engages and disengages the ratchet teeth at the tip of the arcuate wedge portion A latch lock comprising a combination incorporated in the recess. In Claim 3, the positioning fitting hole is formed in the wide side wall of the lock box, and the case of the one-way rotation control damper member is in a state in which one end portion of the case is fitted in the fitting hole and A latch lock, which is fixed to the wide side wall through a flange portion protruding from the case.

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