JP4956166B2 - Latch mechanism with face lock - Google Patents

Description

  The present invention relates to a latch mechanism for a surface-locking mechanism that restricts opening of a door by projecting a leading end of a latch that advances and retreats from a lock case fixed to a door surface from a door opening and closing end and locking the locked body. For example, it is suitable for use on a full glass door.

  In recent years, glass doors have been frequently used due to the improvement in strength of glass materials. When the full glass door is installed, for example, at the entrance of an office building or the entrance of a store, it is necessary to provide a locking device. Conventionally, when a locking device is provided on this type of full-surface glass door, it has been common to provide the locking device on a hanging metal fitting, an upper collar, a lower collar, or a metal frame attached to the center. However, if a metal frame portion is provided in order to provide a locking device, the design of the folded glass door may be lowered, and it is preferable that these metal frame portions are not provided. In order to solve such a problem, the door lock of Patent Document 1 in which only the locking device is attached to the entire glass door using an attachment hole directly drilled in the door glass material has been proposed. According to this door lock, it is possible to attach only the door lock to the open / close end of the full surface glass door without attaching a metal frame part for providing a locking device to the full surface glass door, without impairing the design of the full surface glass door, I was able to improve the appearance.

JP 2002-523660 Gazette

  Since the above-described conventional door lock can be attached using an attachment hole directly drilled in the door glass material, it is not necessary to deteriorate the design of the entire glass door as compared with the case of attaching a metal frame portion. However, since it is a full-surface glass, it is preferable that the exclusive area of the locking device is as small as possible when designability, designability, and the like are further added. Under such circumstances, there has been a demand for a more compact locking device for a full glass door. Further, in the case of a double-sided full-face glass door, a relatively large separation distance is secured because interference between the doors is avoided. For this reason, for example, the advancing / retreating distance of the latch that is advanced / retracted by the latch mechanism has to be increased, and the rotation operation angle of the lever handle that is the opening / closing operation member is increased, which may deteriorate the operability.

  The present invention has been made in view of the above situation, and provides a latch mechanism with a surface lock that can make the latch mechanism compact and can pull the latch into the lock case with a small rotational operation angle. The purpose is to improve operability.

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
The latch mechanism of the face-locking device according to claim 1 of the present invention is such that the tip 25a of the latch 25 that advances and retreats from the lock case 21 fixed to the door surface 37 protrudes from the door opening / closing end 33 and is engaged with the locked body 17. It is a latch mechanism of the surface lock 100 that restricts the opening of the door 11 by stopping,
An opening / closing operation member 23 that is rotatable by a shaft portion 35 passing through the door 11 and the lock case 21 in a direction perpendicular to the door surface 37;
A cam plate 41 fixed to the shaft portion 35 in the lock case 21;
An amplifying swing in which a proximal end is rotatably supported by a swing shaft 75 erected in the same direction as the shaft portion 35 in the lock case 21 and a distal end presses the latch 25 in a backward direction in the case 21. Moving arm 77,
A connecting arm 83 having a base end rotatably fixed to the cam plate 41 and a tip end rotatably fixed to the amplification swing arm 77;
With
The swing shaft 75 is disposed between the cam plate 41 and the door open end 33, and the center of rotation of the cam plate 41 and the swing shaft 75 are in the advancing / retreating direction of the latch 25. Arranged on a substantially horizontal line
The base end of the connecting arm 83 is rotatably fixed to the outer side of the rotational radius of the cam plate 41, and the distal end of the connecting arm 83 is substantially at the center of the rotational radius of the amplifying swing arm 77 and the swinging arm. It is rotatably fixed to the amplification swing arm 77 between the moving shaft 75 and
The fixed portion 93 of the cam plate 41 and the connecting arm 83 and the tip of the amplification swing arm 77 are disposed on a substantially horizontal axis that is the forward / backward direction of the latch 25,
The rotation distance of the fixing portion 93 between the cam plate 41 and the connecting arm 83 is smaller than the distance of the latch 25 in the backward direction of the case.

In this surface-locking latch mechanism, the rotation angle θ of the opening / closing operation member 23 for retracting the latch 25, that is, the rotation angle θ of the cam plate 41 is reduced, and the rotation exclusive space for operating the cam plate is suppressed to be small. Is done. In addition to this, the latch 25 can be retracted into the lock case 21 at a rotation operation angle θ with a small opening / closing operation member 23. Thereby, especially when the door 11 is a full-surface glass, the lock case 21 is formed small and becomes inconspicuous.
Further, in this latch mechanism with a face lock, the amplification swing arm 77 can be arranged in parallel with the accommodation space of the latch 25 that reciprocates between the cam plate 41 and the door opening / closing end 33. And a latch accommodating space between the door opening / closing end 33 is effectively used. That is, it is possible to arrange the constituent members in the lock case 21 at a higher density than when the amplification swing arm 77 is disposed on the opposite side across the cam plate 41.
Further, in this latch mechanism with a face lock, a large rotation input distance can be taken out from the rotation of the opening / closing operation member 23, and the rotation input distance is inputted to the swing shaft 75 side of the amplification swing arm 77, so that The input distance is amplified and converted into a latch reverse operation distance of the amplification swing arm 77.

  According to a second aspect of the present invention, the front end of the amplification oscillating arm 77 presses the rear end portion 81 of the latch 25 in the backward movement direction of the case.

  In this surface-locked latch mechanism, the amplification oscillating arm 77 can be disposed closer to the cam plate 41 than when the tip of the amplification oscillating arm 77 presses the central portion of the latch 25. As a result, the amplification swing arm 77 is arranged close to the cam plate 41 in the accommodation space in the lock case formed in parallel with the latch 25, and the constituent members can be accommodated at high density.

  According to a third aspect of the latch mechanism of the surface lock, the opening / closing operation member is a lever handle 23.

  In this latch mechanism with a surface lock, compared to the case where the opening / closing operation member is, for example, a ball grip handle, the distance from the center of rotation to the point of application of the operation force is ensured, and the rotation operation force is small. Input to the latch mechanism can be performed easily and reliably.

According to the latch mechanism for a face-locked structure according to the first aspect of the present invention, the shaft portion of the opening / closing operation member is rotatably supported through the lock case and the door, and the cam portion is camped on the shaft portion in the lock case. Amplifying oscillating arm that fixes the plate and pushes the latch backward in the case is rotatably supported by the oscillating shaft, and the cam plate and the amplifying oscillating arm are connected by a connecting arm, and the cam plate and the connecting arm are connected. Is set to be smaller than the distance in the retracting direction of the latch in the case, the rotation angle of the opening / closing operation member for retracting the latch, that is, the rotation angle of the cam plate can be reduced, The latch mechanism can be made compact by suppressing the rotation exclusive space for operating the cam plate to be small. In addition to this, the latch can also be pulled into the lock case at a rotation operation angle with a small number of opening / closing operation members. As a result, when the door is made entirely of glass, the lock case can be made small to enhance the design and the operability of rotation.
Further, according to the latch mechanism of the face-locking, since the swing shaft is disposed between the cam plate and the door open end, the latch receiving space that reciprocates between the cam plate and the door open / close end is provided. Amplification swing arm can be installed side by side, the latch receiving space between the cam plate and the door open / close end can be used effectively, and the amplification swing arm is placed on the opposite side across the cam plate Compared to, the lock case can be made compact.
Furthermore, according to the latch mechanism of the surface lock, the base end of the connecting arm is fixed to the outer side of the rotating radius of the cam plate, and the tip of the connecting arm swings with the substantially central part of the rotating radius of the amplification swinging arm. Since it is fixed to the amplification swing arm between the shaft, a large rotation input distance is extracted from the rotation of the opening / closing operation member, and this rotation input distance is input to the swing shaft side of the amplification swing arm. The distance can be amplified and converted to a latch retracting working distance of the amplification swing arm. As a result, the latch can be moved backward with a small rotation angle of the opening / closing member.

  According to the latch mechanism of the face-locking device according to claim 2, since the tip of the amplification swing arm presses the rear end portion of the latch in the backward direction in the case, the tip of the amplification swing arm presses the central portion of the latch. Compared to the case, the amplification oscillating arm can be arranged close to the cam plate, and the amplification oscillating arm can be arranged close to the cam plate in the accommodating space in the lock case formed in parallel with the latch. The latching mechanism can be made compact by increasing the housing density.

  According to the latch mechanism of the surface-coated lock according to claim 3, since the opening / closing operation member is a lever handle, it is possible to easily and surely input a small rotational operation force to the latch mechanism as compared with a ball-shaped handle, etc. Can be improved.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a latch mechanism for a face-locking device according to the invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of a surface-mounted lock provided with a latch mechanism according to the present invention as viewed from the indoor side, and FIG. 2 is a front view of the entire glass door to which the surface-mounted lock shown in FIG. FIG. 3 is a perspective view of the surface-coated lock shown in FIG. 1 viewed from the outdoor side.
The latch mechanism of the surface lock according to the present embodiment can be suitably used for an open / close body such as a double-sided full-face glass door. In addition, the latch mechanism is also suitable for use in a single-open full-surface glass door, a double-open / single-open steel door, and the like. In the present embodiment, an example will be described in which the surface lock 100 shown in FIG.

  As shown in FIG. 2, glass panels 13 and 13 are provided on the left and right sides of the building opening, and the glass panels 13 and 13 are attached and fixed to an opening sash or the like. The pair of full-face glass doors 11 and 11 are supported by hinges 15 and 15 so that they can be opened and closed through the sashes of the entrance / exit opening sandwiched between the glass panels 13 and 13. In this embodiment, it can be double-opened indoors). Further, the full glass doors 11 and 11 are normally used in such a manner that one full glass door 11a is restricted from opening and closing and only the other full glass door 11b can be opened and closed. One full glass door 11a can be opened / closed by, for example, an opening / closing regulating means provided on the hinge 15.

  A locked body 17 is attached to one of the entire glass doors 11a, and the locked body 17 can lock a leading end of a later-described latch that protrudes from the surface lock 100. That is, in the state in which one full-face glass door 11a is fixed, the other full-face glass door 11b is locked to the locked body 17 so that the latch is engaged with the indoor body side (the back surface side in FIG. 2). Opening is regulated.

  The surface lock 100 is provided with a lock case 21, lever handles 23 and 23 as opening / closing operation members, a latch 25, a thumb turn 27, a cylinder lock 29, and a trigger 31. Note that the thumb turn 27 and the trigger 31 may not be particularly included as constituent members of the present embodiment. The lock case 21 includes an outdoor case 21a and an indoor case 21b. The outdoor side case 21a and the indoor side case 21b are attached with the door opening / closing end 33 of the entire glass door 11b sandwiched therebetween. From each of the outdoor case 21a and the indoor case 21b, a shaft portion 35 having a handle portion 34 formed at the tip protrudes in a direction perpendicular to the door surface 37.

  The lock with face 100 is made to protrude from the door opening / closing end 33 with the front end of the latch 25 advancing and retreating from the lock case 21 fixed to the entire glass door 11b, and is locked to the locked body 17, thereby fixing the entire glass door 11b. Locked (open door restricted state). The lever handles 23 and 23 are rotatable in a direction perpendicular to the door surface 37 with the shaft portion 35 penetrating the entire glass door 11 b and the lock case 21. The surface lock 100 uses the lever handle 23 as an opening / closing operation member, so that an operation force is applied from the center of rotation (center of the shaft portion 35) as compared with a case where the opening / closing operation member is a ball grip handle or the like. A large distance to the acting point is ensured, and a small rotational operation force can be easily and reliably input to the latch mechanism.

4 is a front view showing the internal configuration of the lock with a face shown in FIG. 1, and FIG. 5 is an exploded perspective view of FIG.
A shaft portion 35 is inserted into the indoor case 21 b through the opening 53, and a cam boss 55 is externally inserted into the inserted shaft portion 35. The cam boss 55 includes an inner cylinder 57 that restricts relative rotation with the shaft portion 35 and an outer cylinder 59 that is fixed to the outer periphery of the inner cylinder 57 and restricts relative rotation with the cam plate 41. A through hole 61 of the inner cylinder 57 is extrapolated to the outer periphery of the shaft portion 35, and a through hole 43 of the cam plate 41 is extrapolated to the outer periphery of the outer cylinder 59. The cam plate 41 is formed by bending a pair of plate members made of sheet metal in parallel. The cam plate 41 is provided with a torsion spring (not shown), and the torsion spring urges the cam plate 41 clockwise in FIG. A rotation restricting protrusion 45 and a stopper 47 are formed on the outer periphery of the cam plate 41 with a recess therebetween, and the rotation restricting protrusion 45 and the stopper 47 rotate the cam plate 41 forward and backward so that the inner wall of the indoor side case 21b. Each of the upright pins 51 provided at 49 is in contact with the upright pins 51 to prevent the cam plate 41 from rotating outside a predetermined rotation angle range. Further, a muffler collar 63 shown in FIG. 4 is extrapolated to the upright pin 51, and the muffler collar 63 can reduce the contact sound with the cam plate 41.

  The latch 25, which is long in the lateral direction, is accommodated in the upper part of the indoor case 21b so as to be able to reciprocate in the longitudinal direction. That is, the latch 25 moves forward from the indoor case 21b and protrudes from the door opening / closing end 33, and moves backward to retract into the indoor case 21b. The latch 25 is locked to a locking portion (for example, strike) 65 of the locked body 17 in a state of protruding from the door opening / closing end 33. Thereby, the opening of the entire glass door 11b is restricted. The latch 25 is provided with a compression spring (not shown), and the compression spring urges the latch 25 in the protruding direction.

  A protrusion restricting pin 67 is erected on the inner wall 49 of the indoor side case 21b, and the protrusion restricting pin 67 restricts the forward movement of the latch 25 by a predetermined amount or more. A silencing collar 69 is extrapolated to the protrusion restricting pin 67, and the silencing collar 69 can reduce the contact sound between the latch 25 and the protrusion restricting pin 67. An opening hole 73 through which the thumb turn shaft 71 passes is formed in the inner wall 49 of the indoor case 21b.

  A swing shaft 75 is erected on the inner wall 49 of the indoor case 21 b, and a support hole 79 of the amplification swing arm 77 is externally inserted into the swing shaft 75. The base end of the amplification swing arm 77 is rotatably supported by the swing shaft 75, and the distal end 77a presses the latch 25 in the backward direction in the case.

  In the surface lock 100, the tip 77a of the amplification swing arm 77 presses the rear end portion 81 of the latch 25 in the backward direction in the case. The rear end portion 81 is formed by bending a rear end developing wall portion of the latch 25 formed of a sheet metal material and engaging the projection 81a with a hole portion of the side plate. Thus, in the surface-coated lock 100, the tip 77a of the amplification swing arm 77 presses the rear end portion 81, so that the amplification swing arm 77 is a cam compared to the case where the tip 77a presses the central portion of the latch 25. It becomes possible to dispose the board 41 close to it. As a result, the amplification swing arm 77 is arranged close to the cam plate in the accommodating space in the indoor case 21b formed in parallel with the latch 25, and the constituent members can be accommodated at a high density. Realization of compact design.

  Further, in the surface-coated lock 100, the swing shaft 75 is disposed between the cam plate 41 and the door opening / closing end 33. As a result, the amplification swing arm 77 can be disposed in parallel with the accommodation space of the latch 25 that reciprocates between the cam plate 41 and the door opening / closing end 33, and the cam plate 41 and the door opening / closing end 33 can be disposed. The latch housing space is effectively used. That is, as compared with the case where the amplification swing arm 77 is disposed on the opposite side across the cam plate 41, it is possible to arrange the constituent members in the indoor case 21b at a high density. As a result, the lock case 21 can be made more compact than the arrangement in which the amplification swing arm 77 is provided on the opposite side with the cam plate 41 interposed therebetween.

  The base end of the connecting arm 83 is pivotally fixed to the cam plate 41, and the distal end of the connecting arm 83 is pivotally fixed to the amplification swing arm 77. A connection hole 85 is formed at the base end of the connection arm 83, and a connection hole 87 is formed at the distal end of the connection arm 83. On the other hand, a connection hole 89 is formed in the vicinity of the outer periphery of the cam plate 41, and a connection hole 91 is formed in the amplification swing arm 77. The base end of the connecting arm 83 and the cam plate 41 are connected by a connecting pin 93 fitted into the connecting hole 85 and the connecting hole 89. The distal end of the connection arm 83 and the amplification swing arm 77 are connected by a connection pin 87 fitted into the connection hole 87 and the connection hole 91.

  In the surface-coated lock 100, the rotational force from the cam plate 41 is transmitted to the latch 25 via the connection arm 83 and the amplification swing arm 77, thereby fixing the fixed portion (that is, the cam plate 41 and the connection arm 83). The rotation distance of the connecting pin 93) is configured to be smaller than the distance of the latch 25 in the backward direction in the case. That is, a quick return mechanism for the latch 25 is configured.

  In this quick return mechanism, the base end of the connecting arm 83 is fixed to the outside of the rotation radius of the cam plate 41, and the tip of the connecting arm 83 is fixed to the turning radius of the amplification swing arm 77 (that is, the length of the amplification swing arm 77 itself). (B) is fixed to the amplification swing arm 77 between the substantially central portion and the swing shaft 75. That is, the relationship between these members is preferably (the distance between the swing shaft 75 which is the length of the amplification swing arm 77 and the tip 77a in contact with the latch 25)> (the connection pin 93 from the center of the shaft portion 35 of the cam plate 41). Center distance >> (distance of the center of the connecting pin 95 from the center of the swinging shaft 75 of the amplification swinging arm 77 to the tip of the connecting arm 83), or (the swinging shaft 75 which is the length of the amplification swinging arm 77) Distance of the tip 77a in contact with the latch 25 >> (Distance from the shaft 35 center of the cam plate 41 to the center of the connection pin 93) ≧ (Connection pin 95 from the center of the swing shaft 75 of the amplification swing arm 77 to the tip of the connection arm 83) The length of each of the ends 77a of the amplifying oscillating arm 77 is larger than the oscillating length due to the rotation of the cam plate 41, thereby increasing the latch 25. After Distance of direction increases.

  In this quick return mechanism, the base end of the connecting arm 83 is fixed outside the rotation radius of the cam plate 41, so that a large rotation input distance can be taken out from the rotation of the lever handle 23, and this rotation input distance is amplified and oscillated. By inputting to the swing shaft 75 side of the arm 77, the rotation input distance is amplified and converted into the latch backward operation distance of the amplification swing arm 77. As a result, the latch 25 can be moved backward with a small rotation angle of the lever handle 23. While the normal lever handle 23 requires an opening / closing operation angle of about 45 °, in the configuration according to the present embodiment, the latch 25 can be retracted by inputting the opening / closing operation angle θ of about 23 °.

Next, the operation of the above latch mechanism will be described.
FIG. 6 is an operation explanatory view when the lever handle rotates in the closed state, and FIG. 7 is an operation explanatory view in the opened state.
In the closed lock 100 shown in FIG. 4, the surface lock 100 protrudes from the door opening / closing end 33 so that the latch 25 protrudes from the door opening / closing end 33 and is locked to the locking portion 65 of the locked body 17. Is in a door opening restricted state. The trigger 31 is in a state of being retracted into the indoor case 21b.

  When the lever handle 23 is rotated counterclockwise in FIG. 6 for the opening operation of the entire glass door 11b, the cam plate 41 is rotated in the same direction and is connected to the cam plate 41 via the connecting arm 83. The amplification swing arm 77 is also rotated in the same direction. When the amplification swing arm 77 is rotated counterclockwise, the tip 77a of the amplification swing arm 77 presses the rear end 81 of the latch 25 to the left in FIG. 6, and the latch 25 is inside the indoor case 21b. Will be drawn into.

  Thereby, the front-end | tip 25a of the latch 25 remove | deviates from the latching | locking part 65, and the door opening restriction state of the whole surface glass door 11b is cancelled | released. When the entire glass door 11b is opened and the opening operation force to the lever handle 23 disappears, the cam plate 41 is rotated clockwise by the torsion spring in FIG. Stops rotating. Further, the latch 25 is also moved to the right in FIG. 7 by the compression coil spring and comes into contact with the protrusion restricting pin 67 to restrict the protrusion more than a predetermined amount. In this state, the trigger 31 is also protruded.

  As described above, in the surface-coated lock 100, the rotation angle θ of the lever handle 23 for retracting the latch 25, that is, the rotation angle θ of the cam plate 41 is reduced, and the rotation exclusive space for operating the cam plate is suppressed to be small. Has been. In addition, the latch 25 can be retracted into the indoor case 21b with a small rotational operation angle of the lever handle 23. Thereby, especially when the full surface glass door 11b is a full surface glass, the lock case 21 is formed small and becomes inconspicuous.

  Therefore, according to the latch mechanism of the surface lock 100 according to the present embodiment, the shaft case 35 of the lever handle 23 is rotatably supported through the lock case 21 and the entire glass door 11b, and the indoor case 21b. The cam plate 41 is fixed to the inner shaft portion 35, and an amplification swing arm 77 that presses the latch 25 in the backward direction in the case is rotatably supported by the swing shaft 75. The cam plate 41 and the amplification swing arm 77 are supported. Are connected by the connecting arm 83, and the rotation distance at the fixed portion between the cam plate 41 and the connecting arm 83 is set to be smaller than the distance of the latch 25 in the retracting direction in the case. Therefore, the lever handle 23 for retracting the latch 25 is used. The rotation angle θ of the cam plate 41, that is, the rotation angle θ of the cam plate 41 can be reduced, and the rotation exclusive space for the operation of the cam plate 41 is suppressed to be small, and the latch mechanism is made compact. can do.

  In addition to this, the latch 25 can also be pulled into the indoor case 21b with a small rotational operation angle θ of the lever handle 23. As a result, when the door 11 is made entirely of glass, the lock case 21 can be formed small to enhance the design, and the rotational operability can also be improved.

  Further, since the opening / closing operation member is the lever handle 23, it is possible to easily and surely input a small rotational operation force to the latch mechanism and improve the operability as compared with the ball grip handle or the like.

  In the above-described embodiment, the case where the opening / closing operation member is the lever handle 23 has been described as an example. However, the latch mechanism of the surface lock according to the present invention has a ball-shaped grip handle, a so-called knob. Needless to say, it may be an irregularly shaped operation member, and any of them can be configured with a small rotation angle during operation, and the operation member can be installed in a narrow range. In addition, the operation range of the operator including the lever handle 23 described above can be reduced, and even a person who cannot take a large opening / closing operation can perform the opening / closing operation.

  Further, in the above embodiment, the case where the face-locking 100 is provided on the double-sided full-face glass door 11 has been described as an example. However, the face-locking is a single-opening full-face glass door, double-opening / single-opening steel. Of course, it may be used for doors or wooden doors, and since it has a small structure as a locking device, it can also be used for small doors and has a great influence on the design of the doors of various materials. Without giving, it is possible to configure a good locking device.

It is the perspective view seen from the room inner side of the lock with the latch mechanism according to the present invention. It is the front view which looked at the full surface glass door to which the lock with a surface shown in FIG. 1 was attached from the outdoor side. It is the perspective view which looked at the lock with face shown in FIG. 1 from the outdoor side. It is a front view showing the internal structure of the lock with a face shown in FIG. FIG. 5 is an exploded perspective view of FIG. 4. It is operation | movement explanatory drawing at the time of lever handle rotation in a closed state. It is operation | movement explanatory drawing of a door open state.

11 ... door (full glass door)
17 ... Locked object 21 ... Lock case 23 ... Opening / closing operation member (lever handle)
25 ... Latch 25a ... Front end 33 ... Door open / close end 35 ... Shaft portion 37 ... Door surface 41 ... Cam plate 75 ... Oscillating shaft 77 ... Amplification oscillating arm 77a ... Tip 81 ... Rear end portion in the rearward direction of the latch in the case 83 ... Connecting arm 100 ... Lock with surface

Claims (3)

A latch mechanism with a surface lock that restricts the door from opening by projecting the tip of the latch that advances and retreats from the lock case fixed to the door surface from the door opening and closing end and locking it to the locked body,
An opening / closing operation member that is pivotable with a shaft portion passing through the door and the lock case in a direction perpendicular to the door surface;
A cam plate fixed to the shaft portion in the lock case;
An amplifying oscillating arm whose base end is rotatably supported by an oscillating shaft erected in the same direction as the shaft portion in the lock case, and a distal end presses the latch in a backward direction in the case;
A connecting arm having a base end rotatably fixed to the cam plate and a tip end rotatably fixed to the amplification swing arm;
With
The swing shaft is disposed between the cam plate and the door open end, and the pivot center of the cam plate and the swing shaft are disposed on a substantially horizontal line that is the forward and backward direction of the latch. And
The base end of the connecting arm is fixed to the outer side of the rotating radius of the cam plate so as to be freely rotatable, and the distal end of the connecting arm is formed between a substantially central portion of the rotating radius of the amplifying swing arm and the swing shaft. It is pivotally fixed to the amplification swing arm between,
The fixed portion of the cam plate and the connecting arm, and the tip of the amplification swing arm are arranged on a substantially horizontal axis that is the forward and backward direction of the latch,
A latch mechanism for a surface-locking device, wherein a rotation distance of a fixing portion between the cam plate and the connecting arm is smaller than a distance in a backward direction of the latch in the case. 2. The latch mechanism for a face-locking device according to claim 1, wherein a tip end of the amplification swing arm presses a rear end portion of the latch in a backward direction in the case . 3. A latch mechanism for a face-locking device according to claim 1, wherein the opening / closing member is a lever handle .

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