JP2009221840A - Lockout preventing device for thumb-turn lock of interior door - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent lockout when closing a door, to enable easy locking, to facilitate assembling by effectively utilizing a space in a lock box. <P>SOLUTION: An operating rod 15A of a latch 11 is horizontally disposed in the central part of an internal space of a lock box 5. A latch cam 70A whose tip is engaged with the operating rod is rotatably installed at either the upper side or the lower side of the internal space on the basis of the operating rod. At the opposite side of the latch cam, a release component 31A for a thumb-turn top joint 50A and a lock piece 60A for the latch cam are installed from the front 7 side toward the back wall 8a side of the lock box. When an interior door is closed, the latch touches the edge of a door frame and moves backward to cooperatively rotate the release component according to the backward movement of the operating rod, thereby displacing the rotational position of a driving arm of the thumb-turn top joint, and rotating the lock piece for the latch cam to release one engaging part 65A of the lock piece from the engaged part 73A at the tip of the latch cam. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a device for preventing a thumb turn lock of an indoor door from being locked out. Here, “thumbturn lock” is used in the meaning of a locking device for a handle lock inside a house.

  Regardless of whether the door is inside or outside of the building, when the doors at the entrances and exits of a building, such as a toilet or bedroom, are locked when the door is open, and then the door is closed carelessly There is a case where a lock-out situation occurs. Therefore, for example, Japanese Patent Laid-Open No. 2001-146865 exists as a conventional example for the purpose of eliminating the lock-out situation. However, the embodiment described in this publication is suitable mainly for the door lock of the outer door provided at the entrance of the building. This is because the door lock is provided with a sickle lock in addition to the latch lock, and a vertically long slider plate intersecting with the latch shaft is provided in the lock box, and a thumb turn dharma and a sickle piece are provided on the upper and lower portions of the slider plate. This is because the engaging portions that are locked in the locked state are formed.

  Therefore, the door lock having the above-described structure requires a two-stage lock in order to prevent a lock-out situation. That is, first, either the inner or outer lever handle is turned upward from the latch protruding state to perform the first locking, and then the second locking is performed using the thumb turn or the key.

  Although the structure of the above embodiment is complicated, the main point is to prevent inadvertent locking of each locking piece preliminarily by performing a two-stage locking operation at the time of locking. It is to prevent the occurrence of as much as possible.

  However, if the locking mechanism of the door lock is complicated, it is a problem because the manufacturing cost is first increased. Next, in terms of the purpose of preventing the inner lock, the novelty can be found for the purpose, but since a plurality of locking pieces are provided, a key is necessary when unlocking.

  That is, in the case of the inner lock, it is troublesome because it has to be unlocked by operating keys, pins and the like.

  Therefore, the appearance of door locks that do not cause a lock-out situation (inner lock), especially in indoor doors provided at the entrances and exits of rooms such as toilets and bedrooms, in particular, the lock-out prevention device for thumb-turn locks on indoor doors. Has been requested.

Japanese Utility Model Publication No. 6-71811

  A first object of the present invention is to prevent a lock-out situation when an indoor door is closed. As a specific subordinate concept, the present invention automatically locks the thumb-turn lock when the latch is retracted when the indoor door is closed in a state where it is out of the bedroom, toilet, etc. due to carelessness or playing with a child. Is intended to be unlocked. The second object is that when the user enters the bedroom, toilet, etc. while achieving the first object, the thumb turn lock can be easily locked from the room. The third object is to rationally dispose the release components with respect to the operating rod and thumb turn dharma, and to effectively utilize the space in the lock box. The fourth object is to reduce the number of parts as much as possible and facilitate assembly. Thereby, it can also be manufactured at low cost.

  In the indoor door thumb-turn lockout preventing device according to the present invention, the operating rod 15A of the latch 11 is disposed horizontally at the center of the internal space of the lock box 5, and the upper side of the internal space with respect to the operating rod. A latch cam 70A whose tip is engaged with the operating rod is rotatably provided on one of the lower sides, and in contrast to the internal space (the other of the internal spaces) on the opposite side where the latch cam 70A exists. , A release member 31A for thumb turn dharma 50A connected to a shaft of a thumb turn (operation member) from the front 7 side to the rear wall 8a side of the lock box and a lock piece 60A for the latch cam 70A are disposed respectively. The release component for the thumb turn dharma is disposed between the first operating gear 32A having a function of engaging / disengaging the operating rod, and the first operating gear 32A and the thumb turn dharma. And the second operating gear 40A having an intermediary transmission function. When the indoor door is closed, when the latch is retracted against the edge of the door frame, the release component is moved based on the backward movement of the operating rod. By rotating together, the rotational position of the driving arm of the thumb turn dharma is displaced and the latch cam lock piece 60A is rotated. One of the engaging portions 65A is an engaged portion at the tip of the latch cam 70A. It is separated from 73A (it will be in a disengagement state), It is characterized by the above-mentioned. Here, the “operation member” naturally includes not only the lever handle but also the knob.

(1) An indoor door provided at a doorway in a room such as a bedroom may be locked when the door is open, and then the door is inadvertently closed. Such a shut-out situation when the indoor door is closed can be prevented.
(2) If the latch is retracted when the indoor door is closed while leaving the bedroom, toilet, etc., for example due to carelessness or playing with a child, the thumb turn lock will automatically be unlocked. There is no need to unlock the thumb turn with pins, coins, etc.
(3) While achieving the main object of the invention, when entering a bedroom, toilet or the like, the thumb turn lock can be easily locked from the room.
(4) Since the release components are disposed rationally (one direction) in the internal space of the lock box with respect to the operating rod and thumb turn dharma, the space in the lock box can be effectively utilized.
(5) The number of parts can be reduced as much as possible, and assembly can be facilitated. Therefore, it can be manufactured at low cost.

1 to 14 are explanatory views showing a first embodiment of the present invention. 13 and 14 are schematic explanatory views for explaining the operation of the present invention. 15 to 19 are explanatory views showing a second embodiment of the present invention.
Explanatory drawing of the unlocked state seen from the front at the time of an indoor door closing. Here, the state where the case lid is opened is the front. Explanatory drawing from the plane of a latch. Explanatory drawing from the perspective of an operating rod. Explanatory drawing from the front of an operating rod. Explanatory drawing from the plane of an operating rod. Explanatory drawing from the front of a lever. Explanatory drawing from the right side of a lever. Explanatory drawing from the front of the slider. Explanatory drawing from the plane of a slider. Explanatory drawing from the right side of Samturn Dharma. Explanatory drawing from the front of a lock piece. Explanatory drawing from the right side surface of a lock piece. The schematic explanatory drawing at the time of locking of a thumb turn lock. Schematic explanatory drawing at the time of unlocking the thumb turn lock. Explanatory drawing of the unlocked state seen from the front at the time of the indoor door closing of 2nd Example. The perspective view which shows the 1st operating gear of an operating rod and a release structural member. Explanatory drawing which shows an example of a lock piece. The schematic explanatory drawing at the time of locking of a thumb turn lock. Schematic explanatory drawing at the time of unlocking the thumb turn lock.

  1 to 14 are explanatory views showing a first embodiment of the present invention. First, the environmental member will be briefly described. 1 is a door frame of an entrance / exit of a bedroom, toilet, etc., 2 is a bracket having a strike, 3 is an edge of the door frame (directly includes a strike), 4 is attached to the door frame via a hinge and is horizontal An indoor door 5 that pivots in the direction to open and close the doorway 5 is a lock box provided at the door end of the indoor door and provided with a thumb-turn lockout prevention device X.

  Next, the lock box 5 will be briefly described. The lock box 5 is generally composed of a case body 5a and a case lid 5b that closes one side opening of the case body 5a, but detailed illustration is omitted here.

  The case body 5a in which each component is incorporated is provided with a plurality of shaft holes, shaft cylinders, horizontal guide portions (for example, horizontal guide grooves), etc., but matters that are not directly related to specific matters of the invention. I will omit the explanation. Thus, the main components of the lock box 5 will be described. Reference numeral 6 denotes a front, 7 denotes a long plate-like mounting plate, and 8 denotes a case portion of a case body 5a formed integrally with the mounting plate.

  Next, the thumb-turn lockout prevention device X will be described. Reference numeral 11 denotes a latch that appears and disappears with respect to the front 6. As shown in FIG. 2 (plan view), the latch 11 includes an engagement head 12 and a latch shaft 13 provided integrally with the engagement head 12. An inclined sliding contact surface 12a that hits the edge 3 of the door frame 1 and an engagement surface (shock surface) that intersects the inclined sliding contact surface 12a and is locked to the strike of the receiving metal fitting 2 when the door is closed. 12b and a rear wall surface 12c orthogonal to the engagement surface 12b.

  The latch shaft 13 has a hook-like fitting portion 13a provided in a rear end portion of the latch shaft 13 so as to be connected to the annular groove. As long as the latch 11 has a function of retreating against the edge 3 of the door frame 1 when the door is closed, its form and function are not particularly limited. Therefore, an inversion latch that rotates while moving backward may be used. The latch 11 is provided in an opening window formed in the front 6 and the mounting plate 7 or in a latch frame portion 14 formed in an opposing wall shape on the mounting plate 7 and the case portion 8.

  Reference numeral 15 denotes a horizontal rod-like actuating rod disposed horizontally behind the latch. As shown in FIG. 3, the overall shape of the operating rod 15 is a short rectangular shape with a rectangular end face. In this embodiment, the latch frame 14 is assembled in a state of being urged by a latch spring 17 in an operating rod frame portion 16 provided in a horizontal direction with a required space.

  3 is an explanatory view from the perspective of the operating rod, FIG. 4 is an explanatory view from the front thereof, and FIG. 5 is an explanatory view from the plane. In the stepped fitting groove for the latch shaft 13 formed at the front end portion, the hook-like fitting portion 13a having the above-described annular groove of the latch shaft 13 is fitted into the fitting groove 21.

  On the other hand, 22 is a spring end storage recess (spring end support portion) for the latch spring formed on the wall surface of the rear end portion of the operating rod 15, and this spring end storage recess 22 and the rear wall of the operating rod frame portion 16 A latch spring 17 for indirectly urging the latch 11 is incorporated in the lateral state.

  Further, as a related component relating to the main part of the present invention, 23 is formed along the lateral direction at a part near the rear end of the bottom of the operating rod 15, and is vertically or inclinedly covered on the front side in the notch. This is a lever relief notch having an engagement surface 24.

  Furthermore, although it is not a specific matter of the present invention, 25 is formed in a part of the side wall (front wall as viewed from FIG. 3) near the front end part, extending from the edge of the upper end part to the vicinity of the bottom part. In the engagement groove, the wide engagement groove 25 engages with a free end portion of a latch lever arranged to hang down on the upper side of the case portion 8.

  Reference numeral 31 denotes a release component disposed below the lock box 5 or the case portion 8 with respect to the operating rod. The release component 31 includes a plate-shaped or arm-shaped lever 32 that is pivotally supported by a fixed shaft 34 so that the engaging claw portion at the tip end is engaged with the engaged surface 24 of the operating rod 15. A plate-like slider 40 is provided so that the tip end side engages with the lower end of the lever 32 and slides in the horizontal direction.

  FIG. 6 (front view) and FIG. 7 (right side view) show an example of the lever 32. Referring to each of these figures, 35 is a shaft hole formed at the upper end, 36 is an engaging claw projecting radially in part of the upper end, and 37 is a small projecting projecting at the lower end. A projecting shaft 38 is a sliding contact portion projecting on the opposite side to the small projecting shaft. The engaging claw portion 36 faces the engaged surface 24 of the operating rod 15 when the thumb turn is locked. In this embodiment, since the engaged surface 24 of the operating rod 15 constitutes a part of the lever relief notch 23, the operating rod 15 retracts against the spring force of the latch spring 17 by the backward movement of the latch 11. When this is done, the fixed shaft 34 rotates around the fulcrum while being pushed by the engaged surface 24 of the operating rod 15.

  FIG. 8 (front view) and FIG. 9 (plan view) show an example of a pistol-shaped slider 40 in appearance. In the present embodiment, the horizontally long slider 40 is interposed between the lever 32 disposed below the lock box 5 and the thumb turn dharma 50, and interlocks with the lever 32 when the indoor door 4 is closed. It plays the role which pulls the drive arm 51 away from the lock piece 60 (refer FIG. 1, FIG. 14). Therefore, the slider 40 is provided with a plurality of engaging portions or engaged portions (engaging grooves, engaging holes, engaging protrusions, etc.) related to both the members 32 and 50.

  That is, 41 is a first vertical guide slot formed in the lower portion of the wide tip, and the small projection shaft 37 of the lever 32 engages with the first vertical guide slot 41. Reference numeral 42 denotes a second vertical guide slot formed in the rear end, and a projection shaft 52 projecting from the drive arm 51 of the thumb turn dharma 50 is engaged with the second vertical guide slot 42. Reference numeral 43 denotes a slider guide shaft that protrudes from appropriate portions before and after the slider 33 and engages with a plurality of horizontal guide grooves formed on the inner wall surface of the case portion 8.

  As shown in FIG. 10, the thumb turn dharma 50 includes a pair of left and right cylindrical fitting portions 53 and 53 that fit into fitting holes (not shown) formed in the lower portion of the lock box 5, and these cylindrical fittings. A large-diameter cylindrical portion 54 positioned between the portions, the above-described drive arm 51 extending in a radial direction from a part of the outer peripheral wall of the large-diameter cylindrical portion 54, and a projecting portion at the tip of the drive arm 51 The projecting shaft 52 includes a projecting shaft 52 and a mountain-shaped spring receiving portion 55 which is opposite to the position where the projecting shaft 52 is formed and which is continuously formed on one side wall of the large-diameter cylindrical portion or driving arm 51.

  Reference numeral 56 denotes a thumb turn dharma spring which presses the thumb turn dharma 50 in a predetermined position. The thumb turn dharma spring 56 has a central portion wound around the fixed shaft 34 as shown in FIG. The lower end of the portion 16 is pressed against the lower wall, while the other end of the longer portion is on the spring receiving portion 55. The thumb turn darma spring 56 has a click function.

  A latch cam lock piece 60 is pivotally supported by a support shaft 61 provided between the rear wall 8a of the case portion 8 and the rear wall 16a of the operating rod frame portion 16. In this embodiment, the lock piece 60 is connected to the latch cam 70 provided at the top of the lock box 5, and the lower end of the lock piece 60 is engaged with the drive arm 51 of the thumb turn dharma 50. It is arranged at the center on the rear wall 8a side.

  FIG. 11 (front view) and FIG. 12 (right side view) show an example of a latch piece for a latch cam. The lock piece 60 bends a metal plate of an arbitrary shape in an opposing state, and forms a spring accommodating space 63 in which a return spring 62 is housed. Reference numeral 64 denotes a shaft hole for the support shaft 61 that is horizontally mounted on the lock box 5, 65 denotes an upper first engaging portion with respect to the shaft hole 64, and 66 denotes a lower portion with respect to the shaft hole 64. It is the 2nd engaging part.

  Thus, the first engaging portion 65 is engaged with and disengaged from the first engaged portion 73 projecting radially from a part of the outer peripheral wall of the cylindrical fitting portion 72 having the angular shaft hole 71 of the latch cam 70. To do. In the present embodiment, the engaged portion 73 of the latch cam 70 is formed in the shape of a fish tail, and the finger-like first engaging portion 65 of the lock piece 60 is engaged with the recessed portion in the center portion when the thumb turn is locked.

  On the other hand, the second engaging portion 66 is formed by extending a part of the lower end portion of one side wall of the lock piece 60 like a finger, and is pressed against the distal end portion of the driving arm 51 of the thumb turn dharma 50 when the thumb turn is locked. . Reference numeral 67 denotes a contact portion of a lock piece having a required notch space 68 and facing the second engagement portion 66. The contact portion 67 hits the rear wall 16a of the operating rod frame portion 16 when the thumb turn is unlocked. (Stopper function).

  The latch cam 70 can be rotated by operating an internal / external handle (not shown), and is rotated when the internal / external operation handle is operated when unlocking the thumb turn. In the present embodiment, a second engaged portion 74 similar to the engaged portion 73 is provided in the radial direction on the opposite side of the latch cam 70 from the first engaged portion 73. The latch cam operating arm 76 is engaged with the second engaged portion 74 so as to be horizontally movable.

  Further, in this embodiment, when the latch cam operating arm 76 moves in the horizontal direction, the above-described latch lever 81 is disposed so as to swing around the upper fixed shaft 82 as a fulcrum. Note that the latch cam operating arm 76 and the latch lever 81 are not specific requirements of the present invention, and thus detailed description thereof is omitted.

  Next, the operation will be described with reference to FIGS. First, FIG. 1 shows a state of a door lock (particularly a thumb turn lock) when the indoor door 4 such as a toilet is closed. In FIG. 1, the drive arm 51 of the thumb turn dharma 50 is located on the left side away from the second engaging portion 66 below the lock piece 60 (unlocked state).

  Therefore, when a resident who has entered the toilet wants to lock the thumb turn, when the thumb turn (not shown) is turned in the locking direction, the thumb turn dharma 50 is turned clockwise as indicated by the arrow in FIG. Then, the distal end portion of the drive arm 51 presses the second engagement portion 66 of the lock piece 60. As a result, the lock piece 60 rotates counterclockwise against the spring force of the return spring 62.

  As a result, the index finger first engaging portion 65 of the lock piece 60 is engaged with the fish tail-shaped first engaged portion 73 of the latch cam 70. At this time, even if someone tries to turn the outer operation lever from outside the room, the indoor door 4 cannot be opened because the latch cam 70 is stopped by the lock piece 60 or the like. At this time, since the release component 31 is interlocked with the movement of the drive arm 51, the engaging claw portion 36 of the lever 32 rotated counterclockwise as the slider 40 moves to the right side (locking piece side). It faces the engaged surface 24 of the operating rod 15.

  By the way, in general, when a resident is in a toilet or the like, there is no problem in locking the lock piece 60 to the latch cam 70 by turning the thumb turn (thum turn dharma) in the locking direction (clockwise) in this way. This is because the indoor door 4 cannot be opened unless the thumb turn dumal 50 is always returned to the unlocking direction and the lock piece 60 is unlocked when leaving the toilet.

  However, as a rule of thumb in everyday life, for example, when a child is outside the room and opens the indoor door 4, there is a case where the indoor door 4 is closed by playing or carelessly turning the thumb turn in the locking direction. In addition, even an adult may inadvertently turn the thumb turn in the locking direction when the indoor door 4 is opened. When the indoor door is closed from the outside in this way, a so-called “tightening situation” occurs, and the thumb turn lock can be easily unlocked unless an unillustrated pin, coin, key or the like is operated from the outer wall surface side of the indoor door 4. Will not be able to.

  Therefore, in the embodiment of the present invention, as shown in FIG. 14, when the indoor door 4 is closed, when the latch 11 comes back against the edge 3 of the door frame 1, the release component 31 is In cooperation with the backward movement, the drive arm 51 of the thumb turn dharma 50 is pulled away from the second engagement portion 66 of the lock piece 60.

  That is, when the operating rod 15 is pushed by the latch 11 and retreats against the spring force of the latch spring 17, the lever 32 is pushed by the engaged surface 24 of the operating rod 15. Rotate clockwise with the fixed shaft 34 as a fulcrum. When the lever 32 rotates clockwise, the slider 40 slides toward the front 6 side as indicated by an arrow. At this time, the slider 40 pulls the drive arm 51 of the thumb turn dharma 50, so that the drive arm 51 moves away from the second engagement portion 66 of the lock piece 60. When the drive arm 51 is separated from the second engagement portion 66, the lock piece 60 becomes free and automatically rotates in the direction of disengagement by the spring force of the return spring 62. Therefore, when the indoor door 4 is closed, the so-called inner lock is always canceled (the state is always in the state shown in FIG. 1) because the latch 11 moves backward.

  In this embodiment, the lock piece 60 is pivotally supported by the fixed pivot 61, but the fixed pivot 61 may be a movable pivot. In this case, for example, a guide long hole for the movable pivot is formed in the lock box 5. Thus, when the fixed pivot 61 is a movable shaft guided by the lock box 5, when the drive arm 51 of the thumb turn dharma 50 is separated from the second engagement portion 66 of the lock piece 60, the lock piece 60 is returned. The spring 62 moves in the direction of disengagement by the spring force.

  Further, the spring end housing recess 22 formed at the rear end of the operating rod 15 may be a small protrusion for supporting the spring end. In addition, the relationship between the engaging portion and the engaged portion of the main member is merely a change in design (equal items).

  Further, in this embodiment, the thumb turn dharma release component that engages with the operating rod is incorporated below the lock box 5, but the thumb turn dharma is disposed on the upper side while the latch cam is disposed on the lower side. In the case of the example, the release component is also provided above corresponding to the position of the thumb turn dharma.

  Accordingly, a second embodiment in which the release component is assembled upward will be described with reference to FIGS. In the second embodiment, the same parts as those in the first embodiment are denoted by the same or similar reference numerals, and redundant description is omitted.

  First, the differences between the first embodiment and the second embodiment are briefly listed as follows. The point that the form of the operating rod 15A is different, the arrangement position of the latch spring 17A is different, the release component 31A is incorporated in one (for example, the upper) space of the lock box 5 with respect to the operating rod 15A, The point that the release component 31A is replaced with a plurality of operating gears, the point that a thumb turn Talmah spring 56A is attached to the lock piece instead of the return spring (the point that the return spring for the lock piece is unnecessary, of course, the first The return spring for the lock piece may be provided as in the embodiment), the lock piece 60A is also incorporated in one space of the lock box 5, and the latch cam 70A is based on the operating rod 15A. It is the point incorporated in the other (for example, downward) space space. Other design changes are not an essential part of the present invention.

  Next, mainly different members will be described. FIG. 15 shows an unlocked state in which the thumb turn is not rotated in the locking direction when the door is closed. As is clear from comparison between FIG. 15 and FIG. 1, the operating rod 15A of the second embodiment is longer than that of the first embodiment and extends from the latch frame 14A to the case frame portion 8 beyond the operating rod frame portion 16A. It is in the shape of a long wall extending to the vicinity of the rear wall 8a.

  FIG. 16 shows one of the operating gear 15A and the operating gear 32A of the release component 31A. The operating rod 15A is the same as that of the first embodiment in that it is a horizontal rod-shaped operating rod disposed behind the latch 11 as described above. As shown in FIG. 15, the form is a long rectangular shape with a rectangular end face. In the second embodiment, the operating rod frame portion 16A is incorporated in a penetrating state while being urged by a latch spring 17A having a pushing spring function.

  If it demonstrates on the basis of FIG. 16, 23A is not a lever but the operating gear relief notch part which the protrusion engaging part 36A of the 1st operating gear 32A engages. This notch 23A is formed in the upper part on the near side of the central portion of the operating rod 15A. Therefore, 24A is an engaged surface of the cutout portion 23A with which the protruding engagement portion 36A of the first operating gear 32A is engaged.

  22A is a spring end support portion for a latch spring which is formed on the wall surface of the rear end portion of the operating rod 15A. The latch 11 is indirectly attached between the spring end support portion 22A and the rear wall 8a of the lock box 5. A latching spring 17A is incorporated in the lateral state.

  Reference numeral 25A denotes an engaged portion or an engaging portion (wide notch portion) formed on the side wall on the other side of the operating rod 15A. The wide notch portion 25A is incorporated in a space space below the lock box 5. The leading end portion of the latch cam 70A having the mountain-shaped engaging portion or the engaged portion 73A enters so as to penetrate. Reference numeral 26 denotes a stopper projecting from a lower portion near the rear end of the operating rod 15A. The stopper 26 can contact a vertical portion of the operating rod frame portion 16A.

  Here, the first operating gear 32A of the release component 31A will be described with reference to FIG. The first operating gear 32A is rotatably provided via the fixed support shaft 34A so that the protruding engaging portion 36A engages with the engaged surface 24A of the operating rod 15A. About half of the gear portion 33 of the first operating gear 32A is formed in the circumferential direction. Therefore, when the gear portion 33 and the projecting engagement portion 36A are combined, the first operating gear 32A has a half strong projection portion in the circumferential direction. Since the projecting engagement portion 36A enters the cutout portion 23A of the operating rod 15A with a margin, the gear portion 33 is not formed in the other half of the circumferential direction.

  Referring to FIG. 15, reference numeral 50 </ b> A denotes a thumb turn dharma having a gear portion disposed in an inner space near the rear wall of the lock box 5. Between the thumb turn dharma 50A and the first operating gear 32A, a second operating gear 40A constituting a release component 31A is rotatably provided. The thumb turn dharma 50A is connected to a thumb turn shaft (not shown).

  Therefore, the release component 31A of the second embodiment is disposed between the first operating gear 32A having an engagement / disengagement function with respect to the operating rod 15A, and between the first operating gear 32A and the thumb turn dharma 50A, The second operating gear 40A has a mediation transmission function. Therefore, these operating gears 32A and 40A replace the armband-shaped lever 32 and the plate-shaped slider 40 of the first embodiment with a gear mechanism.

  The angle-shaped lock piece 60A will be described with reference to FIGS. 60 A of lock pieces are arrange | positioned in the internal space of the one side (for example, upper part) of the lock box 5 similarly to the release structural member 31A and the thumb turn dharma 50A. That is, the lock piece 60A is rotatably provided (swinged) via the support shaft 61A in the internal space between the latch spring 17A located behind the operating rod 15A and the thumb turn dharma 50A. As shown in FIG. 17, the lock piece 60A has a U-shaped end face, and a first engagement portion 65A that engages with or disengages from the engagement portion of the latch cam 70A or the engaged portion 73A. It has a pair of finger-like second engaging portions 66A that are connected to the one engaging portion 65A in the crossing direction and engage with the drive arm 51A of the thumb turn dharma 50A. A thumb turn talm spring 56A having a click function is attached to the lock piece 60A via a support shaft 61A.

  In the second embodiment, the release component 31A is incorporated in the internal space above the lock box with reference to the operating rod 15A, together with the thumb turn dharma 50A and the lock piece 60A that engages and disengages with the latch cam. Of course, when the latch cam 70A is disposed on the upper side, it may be incorporated in the lower (one side) internal space.

  In the above configuration, FIG. 18 corresponds to FIG. 13 (locked state) of the first embodiment. That is, FIG. 18 shows a case where the inner lock is inadvertently entered. FIG. 19 shows the moment when the indoor door 4 is closed in the above case. In this case, as in the first embodiment, when the operating rod 15A is pushed by the latch 11 and retreats against the spring force of the latch spring 17A, the projecting engagement 36A of the first operating gear 32A has the operating rod 15A. Therefore, it is rotated counterclockwise about the fixed shaft 34A. When the first operating gear 32A rotates counterclockwise, the second operating gear 40A rotates clockwise as indicated by an arrow.

  Therefore, the driving arm 51A of the thumb turn dharma 50A moves away from one engaging portion 65A of the lock piece 60A and moves to the other engaging portion 66A. When the drive arm 51A changes the position of the drive arm 51A due to the rotation of the thumb turn dharma 50A in this way, the lock piece 60A also rotates somewhat in the direction of disengagement, so the latch cam 70A becomes free and the operating rod 15A Retracts against the spring force of the latch spring 17A. Therefore, when the indoor door 4 is closed, the so-called inner lock is always canceled (the state is always in the state shown in FIG. 15) by the backward movement of the latch 11.

  Therefore, the lock-out prevention device for the thumb turn lock of the indoor door according to the second embodiment has the operating rod 15A of the latch 11 placed horizontally in the center of the inner space of the lock box 5, and the operating rod is used as a reference. A latch cam 70A whose front end engages with the operating rod is rotatably provided at one of the upper side and the lower side of the internal space, whereas the internal space (internal side) on the opposite side where the latch cam 70A exists is provided. A release component 31A for thumb turn dharma 50A and a lock piece 60A for latch cam 70A, which are connected to a thumb turn shaft, from the front 7 side to the rear wall 8a side of the lock box, are arranged in the other space). The thumb turn dharma release component includes a first actuating gear 32A having an engaging / disengaging function with respect to the actuating rod, the first actuating gear 32A and the thumb turn dharma. And a second operating gear 40A having an intermediary transmission function. When the indoor door is closed, when the latch is retracted against the edge of the door frame, the release component is retracted of the operating rod. By the cooperative rotation based on the movement, the rotational position of the drive arm of the thumb turn dharma is displaced, the latch cam lock piece 60A is rotated, and one of the engaging portions 65A of the end portion of the latch cam 70A is rotated. It separates from the engaging part or the engaged part 73A (becomes disengaged). The lock piece 60A for the latch cam 70A is pivotally supported near the rear wall 8a of the lock box 5.

  The present invention is mainly used in the locksmith and joinery industries.

X ... Thumb turn-off prevention device, 1 ... Door frame, 2 ... Receiving bracket, 3 ... Edge, 4 ... Indoor door, 5 ... Lock box, 6 ... Front, 8 ... Case body case part, 8a ... Case part Rear wall, 11 ... latch, 12 ... engaging head, 13 ... latch shaft, 14, 14A ... latch frame, 15, 15A ... operating rod, 16, 16A ... operating rod frame, 16a ... operating rod frame Rear wall, 17, 17A ... Latch spring, 21 ... Fitted groove of operating rod, 23,23A ... Relief notch, 24,24A ... Engaged surface of notch, 25,25A ... engagement groove (or wide) (Notch part), 26 ... stopper, 31, 31A ... release component, 32, 32A ... lever (or first operating gear), 33 ... gear part, 34, 34A ... fixed shaft, 35, 64 ... shaft hole, 36 ... Engagement claw part, 37 ... small projection shaft, 38 ... sliding contact part, 40, 40A ... slider (first Actuating gear), 41 ... 1st vertical guide slot, 42 ... 2nd vertical guide slot, 43 ... Slider guide shaft, 50, 50A ... Thumb turn dharma, 51, 51A ... Drive arm, 52 ... Projection shaft, 53 ... cylindrical fitting part, 54 ... large-diameter cylindrical part, 55 ... spring receiving part, 56, 56A ... thumb turn dharma spring, 60, 60A ... lock piece, 61, 61A ... support shaft, 62 ... return spring, 63 ... Spring storage space, 65, 65A ... first engagement portion, 66, 66A ... second engagement portion, 67 ... contact portion, 68 ... notch space, 70, 70A ... latch cam, 73, 73A ... engaged portion (or Engaging portion), 76... Latch cam operating arm, 81.

Claims (2)

An operating rod 15A of the latch 11 is horizontally arranged at the center of the internal space of the lock box 5, and the tip of the operating rod is located on the upper or lower side of the internal space with respect to the operating rod. A latch cam 70A that engages with the lock cam is rotatably provided. In contrast, the latch cam 70A is provided on the opposite side of the internal space (the other of the internal space) from the front 7 side of the lock box to the rear wall 8a side. A release component 31A for the thumb turn dharma 50A and a lock piece 60A for the latch cam 70A are arranged respectively, and the release member for the thumb turn dharma has a function of engaging / disengaging the operating rod. And a second operating gear 40A disposed between the first operating gear 32A and the thumb turn dharma and having an intermediary transmission function. When the indoor door is closed, the latch is When retreating against the edge of the frame, the release component member rotates cooperatively based on the retreating movement of the operating rod, whereby the rotational position of the driving arm of the thumb turn dharma is displaced and the latch cam locking piece 60A. , And one of the engaging portions 65A is separated from the engaged portion 73A at the distal end portion of the latch cam 70A (becomes in a disengaged state). 2. The lock-out prevention device for a thumb turn lock of an indoor door according to claim 1, wherein the lock piece 60A for the latch cam 70A is pivotally supported in the vicinity of the rear wall 8a of the lock box 5.

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