JP3718823B2 - Latch lock - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a latch lock capable of self-holding a latch bolt in a disengaged state at the time of unlocking, and capable of automatically engaging a latch bolt with a metal fitting when the door is once opened and closed.
[0002]
[Prior art]
For example, in a flat handle type latch lock, a latch mechanism that self-holds a latch bolt in a disengaged state at the time of unlocking is known in Japanese Utility Model Publication No. 1-92473. However, in this latch lock, the latch bolt is urged to the unlocking side by a spring. Japanese Utility Model Laid-Open No. 2-41255 discloses a locking device that can restrain the latch bolt to the unlocked position when the window is opened and switch the latch bolt to the engaged state with the handle only when the window is closed. It is. In a latch device that does not include an operation tool such as a handle or a lever for releasing the latch bolt, the latch body is held in the disengaged state by opening the door, and the door The latch body can be engaged with the support simply by closing the handle etc., but such a latch device is known, for example, in Japanese Patent Laid-Open No. 3-110278, and there are many other proposals.
[0003]
[Problems to be solved by the invention]
In the latch lock, the latch bolt is always moved and urged toward the engagement posture with a spring, and the unlocking operation is performed against the spring with an operation tool such as a handle only when unlocking. For example, this type of latch lock may be attached to a plurality of locations of the opening / closing lid to hold the lid closed. In such a case, the latch bolts must be unlocked by simultaneously operating a plurality of latch lock handles. When the latch locks are arranged close to each other, the unlocking operation can be performed without any problem. However, unlocking becomes difficult when the interval between the latch locks is increased. Furthermore, when the number of latch locks is three or more, it is difficult to open the lid by one operator.
[0004]
It is an object of the present invention to self-hold a latch bolt in a disengaged state by unlocking an operation tool such as a handle in a latch lock in which the latch bolt is biased to move toward an engagement posture by a spring. Accordingly, it is an object of the present invention to provide a latch lock that can be individually unlocked even when a plurality of latch locks are attached to the door or the lid.
Another object of the present invention is to reset the latch bolt to an engageable state simply by opening the door or lid from the opening frame after the latch bolt is disengaged with the operation tool. It is an object of the present invention to provide a latch lock that can open and close a door or a lid in the same manner as a conventional latch lock, and can automatically engage a latch bolt with a metal fitting in a closed state. Another object of the present invention is to easily distinguish between an unlocked lock and an unlocked lock by maintaining the switching state of the operating tool when the latch bolt is disengaged with the operating tool. It is to provide a latch lock that can be used.
Another object of the present invention is to provide a flat handle lock type latch that can satisfy the above-mentioned objects and is suitable for closing and fixing the opening / closing lid of the box and the panel fitted in the opening surface. There is.
[0005]
[Means for Solving the Problems]
The latch lock according to the present invention includes a latch bolt 5 that is slidably guided and supported by a case 4, a spring 6 that moves and urges the latch bolt 5 in a direction to engage with a metal fitting 2 provided on the opening frame 1, and a case. 4, an operation tool 7 for releasing the engagement of the latch bolt 5 against the biasing force of the spring 6, and the latch bolt 5 in a state in which the latch bolt 5 is released from the engagement with the operation tool 7. Is held in a disengaged state. The hold mechanism is disposed adjacent to the periphery of the latch bolt 5 and slidably guided and supported along the latch bolt 5, and the hold body 22 is moved in the same direction as the urging direction of the latch bolt 5. An energizing spring 23, a lock arm 24 that is supported by the latch bolt 5 so as to be able to move together, and swings between a standby posture and an engaging posture, and the latch bolt 5 operates to disengage the spring 6 against the spring 6. When this is done, a contact portion 25 that switches the lock arm 24 to the engaged posture, and a stopper piece 26 that is provided on the hold body 22 and receives and supports the lock arm 24 that has been switched to the engaged posture so that it cannot return and swing. And. In a state in which the latch bolt 5 is disengaged by the operation tool 7, the advancing end of the holding body 22 is received and supported by the peripheral wall of the bracket 2, and the latch bolt 5 is held via the lock arm 24 and the stopper piece 26. The body 22 is held so as not to advance.
[0006]
Specifically, the hold body 22 is arranged in parallel to the engagement surface side of the latch bolt 5. An arm chamber 13 for accommodating the lock arm 24 and the stopper piece 26 is provided in the latch bolt 5. The lock arm 24 is formed in a bell crank shape by a first arm 29 received and supported by the stopper piece 26 and a second arm 30 operated by a contact portion 25 provided on the case 4.
An indented handle case 8 is fixed to the outer surface of the case 4, and a planar handle-like operation tool 7 for disengaging the latch bolt 5 is disposed in the handle case 8. The operating tool 7 is oscillated and biased by a spring 20 in a direction protruding from the handle case 8.
[0007]
The latch bolt 5 and the hold body 22 are slidably guided and supported by the main case 4a and the guide frame 4b fixed to the inner surface of the main case 4a. Operation pins 17 fixed to the latch bolt 5 project from both sides of the guide frame 4b. An arm 7 b for disengaging the latch bolt 5 via the operation pin 17 is provided on the operation tool 7.
The latch bolt 5 is received by the main case 4 a or the guide frame 4 b to define the advance limit of the latch bolt 5, and the stopper piece 26 is received at one end of the arm chamber 13 to define the advance limit of the hold body 22.
The operation tool 7 is composed of a slide lever supported by the case 4 so as to be linearly slidable.
The operation tool 7 is composed of a lever supported by the case 4 so as to be rotatable around a single axis 35, and the rotation operation of the operation tool 7 is converted into a linear motion between the operation tool 7 and the latch rod 5. Provide a mechanism.
[0008]
[Action]
In the closed state where the latch bolt 5 is engaged with the bracket 2, the hold body 22 is received by the peripheral wall of the bracket 2. The lock arm 24 is in a standby state. In this state, when the latch bolt 5 is disengaged against the spring 6 by the operation tool 7, the lock arm 24 moves along with the latch bolt 5 and is operated by the contact portion 25 until the movement is completed. It switches to the engagement posture and faces the stopper piece 26 provided on the holding body 22 with a slight gap. Thereafter, when the operating force of the operating tool 7 is released, the latch bolt 5 attempts to move forward with the spring 6. However, if the latch bolt 5 moves even a little, the lock arm 24 that accompanies the latch bolt 5 is received and supported by the stopper piece 26 in the engaged posture, so that the latch bolt 5 cannot move further. That is, the latch bolt 5 is held in the disengaged state.
[0009]
When the lid 3 is opened from the above state, the hold body 22 moves outward from the opening frame 1 and loses the receiving force by the peripheral wall of the bracket 2, so that the hold body 22 is moved to the advance limit position by the spring 23. Extruded. Along with this, the lock arm 24 and the latch bolt 5 are also moved to the advance limit position by the biasing force of the spring 6. During this time, the lock arm 24 is returned to the standby position by the contact portion 25. That is, the latch bolt 5 and the lock arm 24 are each reset to a standby state. After that, when the lid 3 is closed, the latch bolt 5 is brought into contact with the peripheral wall of the opening frame 1 or the receiving bracket 2 and is retracted while resisting the spring 6, so as to get over the opening edge of the receiving bracket 2. Engage. At this time, the holding body 22 accompanies the latch bolt 5 and retreats inward of the case, and comes into contact with the peripheral wall of the bracket 2 when the latch bolt 5 is engaged with the bracket 3.
[0010]
The holding body 22 is arranged on the side of the engagement surface of the latch bolt 5, and the lock arm 24 and the stopper piece 26 provided on the holding body 22 are accommodated in the arm chamber 13 of the latch bolt 5. This is because the mechanical parts for holding are collectively arranged to reduce the thickness dimension of the latch lock. According to the latch lock in which the operation tool 7 is formed in the shape of a flat handle, the operation tool 7 projects out of the handle case 8 in a state where the latch bolt 5 is held and fixed by the hold mechanism. Easy to distinguish.
[0011]
【The invention's effect】
According to the latch lock of the present invention, since the latch bolt 5 can be held and fixed in the disengaged state by the hold mechanism when the operation tool 7 is unlocked, a plurality of latch locks are provided on the lid 3 or the door. Even when the latch locks are arranged or when the interval between the latch locks is large, the lid 3 and the like can be easily opened by unlocking each latch lock one by one. After unlocking all the latch locks, if the lid 3 is opened, the holding state of the latch bolt 5 by the hold mechanism is released and the latch bolt 5 and the lock arm 24 can be reset. There is no need to provide an operating tool, and the structure of the latch lock can be simplified accordingly. Since the labor for resetting can be saved, the closing operation of the lid 3 and the like can be easily performed especially when a large number of latch locks are attached to the lid 3 and the door.
[0012]
According to the latch lock in which the operation tool 7 is constituted by a swinging displacement handle or a slide displacement lever, the operation tool 7 can be held in the switching state in a state in which the latch bolt 5 is held and fixed by the hold mechanism. The latched lock and the unlocked latched lock can be identified at a glance, and even when the unlocking operation is interrupted, the subsequent unlocking can be performed quickly and without confusion.
[0013]
【Example】
1 to 8 show an embodiment in which the present invention is applied to a flat handle lock type latch lock. In FIG. 2, reference numeral 1 denotes an opening frame of the box body, 2 denotes a receiving bracket embedded and fixed on the inner peripheral surface of the opening frame 1, and 3 denotes a lid body that opens and closes the opening frame 1. One side of the lid 3 is swingably supported by a hinge (not shown), and a latch lock is disposed near the tip of the swing.
[0014]
The latch lock resists the latch bolt 5 that is slidably guided and supported by the case 4, a compression coil-shaped spring 6 that moves and urges the latch bolt 5 in a direction to engage the bracket 2, and the spring 6. The operation tool 7 for releasing the engagement of the latch bolt 5 adopts the same basic structure as the conventional latch lock. In addition, a hold mechanism is added so that the latch bolt 5 can be held at the disengagement position in a state where the latch bolt 5 is disengaged by the operation tool 7.
[0015]
3 and 8, the case 4 is constituted by a rectangular box-shaped main case 4a whose upper surface is open, and a guide frame 4b having a convex cross section welded to the inner surface of the main case 4a. An indented handle case 8 is arranged on the upper surface of the guide frame 4b, and this is welded and fixed to the case 4 to form an outer body of a latch lock. Reference numeral 9 denotes an attachment frame for attaching the latch lock to the lid 3. The case 4, the handle case 8, and the mounting frame 9 are each formed by press-molding a stainless steel plate material.
[0016]
The latch bolt 5 is composed of a bolt main body 5a made of a plastic molded product, and a cover 5b made of a stainless steel plate fitted and fixed from the upper surface side of the bolt main body 5a. At one end of the bolt main body 5a having a quadrangular cross section, an engagement guide surface 11 that is inclined upward toward the upper surface side is provided, and a shaft portion 12 on which the spring 6 is fitted is provided at the other end side. Furthermore, an arm chamber 13 that opens on the upper surface and lower surface side is formed in the middle of the bolt main body 5a, and a lock arm 24 and a stopper piece 26 described later are accommodated therein.
[0017]
As shown in FIG. 8, the latch bolt 5 is vertically sandwiched between the main case 4a and the wide frame portion below the guide frame 4b, and further supports the shaft portion 12 with a spring support 14 fixed to the main case 4a. The whole is guided and supported only slidably along the bottom wall of the main case 4a. In the opened state, the latch bolt 5 is advanced by the spring 6, and the engagement guide surface 11 protrudes from the convex latch hole 15 opened in the main case 4a. At this time, in order to define the advance limit, the slide groove 16 is provided in the opposing wall of the guide frame 4b, and the operation pin 17 penetrating the latch bolt 5 is received by the groove end of the slide groove 16 (see FIG. 4). .
[0018]
The operation tool 7 is formed of a press-formed product of a stainless steel plate material in which a pair of arms 7b are bent downward on both sides of one end of a flat handle portion 7a. The operating tool 7 is assembled to the handle case 8 by a pin 19 so as to be swingable up and down, and a torsion coil spring 20 fitted on the pin 19 swings and urges the handle portion 7 a to protrude from the handle case 8. In this assembled state, the pair of arms 7 b protrudes into the case 4 through a groove provided in the handle case 8 and circumscribes the operation pin 17. Therefore, when the handle portion 7a is lifted outward from the case, the latch bolt 5 moves back into the case 4 against the spring 6. In the non-use state, the handle portion 7a is flush with the opening surface of the handle case 8, and this state is maintained when the side edge of the arm 7b contacts the operation pin 17.
[0019]
The hold mechanism includes a hold body 22 disposed adjacent to the engagement surface 21 side of the latch bolt 5, a compression coil spring 23 that moves and urges the hold body 22, a lock arm 24 touched earlier, and a lock arm. 24 is constituted by a contact portion 25 or the like for switching operation.
[0020]
The holding body 22 is made of a square bar-shaped plastic molded product, and an inverted trapezoidal stopper piece 26 is projected in the middle of the lower surface, and a spring support shaft 27 is projected on the rod end. The holding body 22 is slidably guided and supported by the latch bolt 5 and the narrow frame portion on the upper side of the guide frame 4b, and is a spring 23 interposed between the end portion on the shaft 27 side and the guide frame 4b. 5 is advanced and biased in the same direction as 5, and the protruding end protrudes from the latch hole 15. In this assembled state, the stopper piece 26 enters the arm chamber 13 through a groove provided in the cover 5b. The holding body 22 can move relative to the latch bolt 5, and its advance limit is defined by receiving the stopper piece 26 on the inner end wall of the arm chamber 13. At the advancing limit, the projecting end surfaces of the holding body 22 and the latch bolt 5 are flush.
[0021]
The lock arm 24 is formed by punching a stainless steel plate into a bell crank shape, and includes a first arm 29 and a second arm 30 protruding substantially orthogonally. The lock arm 24 is housed in the arm chamber 13 and is pivotally supported around the pin 31 by pivotally supporting the latch bolt 5 with a pin 31 penetrating the transverse lock. In the assembled state, the first arm 29 is positioned below the stopper piece 26, and the second arm 30 protrudes downward from the groove provided in the bottom wall of the main case 4a. This groove is the contact portion 25 described above, and the lock arm 24 is switched between the engagement posture and the standby posture at the groove end by utilizing the operation of the lock arm 24 moving together with the latch bolt 5.
[0022]
As shown in FIG. 4, the latch lock configured as described above is inserted into the mounting hole 33 of the lid 3 from the outer surface side, the opening peripheral edge of the handle case 8 is brought into contact with the peripheral wall of the mounting hole 33, and then the inner surface side. Then, the mounting frame 9 is put on, and the screw 34 inserted through the mounting frame 9 is screwed into the main case 4a to be fixed to the lid 3. The lid 3 is provided with an opening that allows the latch bolt 5 and the hold body 22 to protrude.
[0023]
Next, the operation of the hold mechanism when the latch lock is locked and unlocked will be described. As shown in FIG. 4, the latch bolt 5 and the hold body 22 protrude from the case 4 in a state where the lid 3 is opened. The lock arm 24 protrudes in a state where the second arm 30 is orthogonal to the bottom wall of the main case 4a. When the lid 3 is closed from this state, the engagement guide surface 11 of the latch bolt 5 comes into contact with the peripheral wall of the opening frame 1 or the receiving bracket 2 and retracts inward of the case 4 against the spring 6. Is entered. At this time, the holding body 22 also moves in and out. At the same time that the latch bolt 5 gets over the peripheral wall, the latch bolt 5 is advanced by the spring 6 and engaged with the receiving metal fitting 2 to keep the lid 3 closed as shown in FIG. The holding body 22 is in a state in which its protruding end surface is received by the peripheral wall of the metal fitting 2 and cannot be advanced any further.
[0024]
As shown in FIG. 6, when the handle 7a of the operating tool 7 is pulled to the outer surface side of the handle case 8 and unlocked, the latch bolt 5 is moved inwardly through the operation pin 17 by the arm 7b. Is done. The first arm 29 of the lock arm 24 passes through the lower side of the stopper piece 26 while the latch bolt 5 is pulled out of the receiving bracket 2. Then, when the hold body 22 starts moving together with the latch bolt 5, the second arm 30 comes into contact with the groove end of the contact portion 25. Therefore, the lock arm 24 gradually swings upward about the pin 31, and the protruding end of the first arm 29 is opposed to the stopper piece 26 when the latch bolt 5 has been retracted and moved as shown in FIG. Switch to the engaged posture.
[0025]
When the operating force of the operating tool 7 is released in this state, the hold body 22 is pushed out by the spring 23, and the tip thereof contacts the peripheral wall of the metal fitting 2. At the same time, the latch bolt 5 moves forward under the urging force of the spring 6. However, immediately after the first arm 29 of the lock arm 24 comes into contact with the stopper piece 26, the latch bolt 5 cannot move any further and is held and fixed in that position. That is, the latch bolt 5 is held and fixed in the disengaged state as shown in FIG. At this time, the handle portion 7 a protrudes outward from the handle case 8. Therefore, it can be known at a glance whether or not the latch lock is unlocked.
[0026]
When all the latch locks attached to the lid 3 are unlocked and then the lid 3 is opened, the hold body 22 that has been received by the peripheral wall of the bracket 2 so as not to advance is lost and no longer supports. 4 protrudes. Along with this, the latch bolt 5 is advanced by the spring 6 to be reset to the initial state shown in FIG. 4, and the handle portion 7 a is returned into the handle case 8. During this time, the second arm 30 of the lock arm 24 comes into contact with the groove end of the contact portion 25 and is swung downward to forcibly reset to the standby posture. That is, the latch bolt 5 and the lock arm 24 can be automatically reset to the initial state simply by opening the lid 3 from the opening frame 1.
[0027]
FIG. 9 shows a modification of the operation tool 7. In this case, the operation tool 7 is constituted by a slide lever arranged on the outer surface of the case 4, and the latch bolt 5 can be disengaged via the operation pin 27 by a pair of arms 7 b protruding from the inner surface of the lever. In this case, a tension coil type or compression coil type spring 20 can be used as the return spring.
[0028]
FIG. 10 shows another embodiment of the operation tool 7. In this case, the operation tool 7 is formed of a lever that can swing around the shaft 35, and an operation conversion mechanism is provided between the lever and the operation pin so that the latch bolt 5 can be disengaged. Specifically, the pinion 36 is fixed to the shaft 35, the rotation operation of the pinion 36 is converted into a linear operation by the rack 37, and the operation is transmitted to the operation pin 17 by the fork-shaped operation piece 38.
[0029]
Thus, the operation tool 7 can employ various structures as necessary. The planar handle-like operating tool 7 in the previous embodiment can be a mechanism for releasing the latch bolt 5 by pushing it into the handle case 8. Further, when the arm 7b is formed in a fork shape similar to the operation piece 38 and the groove portion is engaged with the operation pin 17, the handle portion 7a is swung by the spring 20 so as to be accommodated in the handle case 8. Can be energized.
[0030]
In addition to the above, the holding body 22 can be disposed adjacent to the side surface of the latch bolt 5. Similarly to the cover 5 b of the latch bolt 5, the hold body 22 can be formed in a frame shape with a U-shaped cross section, and can be arranged in a state of being externally fitted to the latch bolt 5. The latch bolt 5 can be formed only from a plastic molded product. The lock arm 24 can be disposed on the outer surface of the latch bolt 5. The contact portion 25 for switching the lock arm 24 does not need to be a groove, and can be formed by a pair of protrusions provided on the inner surface of the case 4, for example. The lock arm 24 can be formed by a switching piece provided with a V-shaped groove on each of the opposing short sides of a rectangular plate.
[Brief description of the drawings]
FIG. 1 is a vertical side view of a latch lock in a state where a latch bolt is held and fixed.
FIG. 2 is a perspective view showing an example of use of a latch lock.
FIG. 3 is a cross-sectional view of a state in which components of the latch lock are disassembled.
FIG. 4 is a longitudinal side view of the latch lock in an opened state.
FIG. 5 is a vertical side view of the latch lock in a closed state.
FIG. 6 is a vertical side view of the latch lock in the middle of unlocking.
FIG. 7 is a vertical side view of the latch lock in a state immediately before the end of unlocking.
8 is a cross-sectional view taken along line AA in FIG.
FIG. 9 is a perspective view showing a modified embodiment of the operation tool.
FIG. 10 is a perspective view showing a modified embodiment of the operation tool.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Opening frame 2 Receiving metal fitting 3 Cover body 4 Case 5 Latch bolt 6 Spring 7 Operation tool 22 Hold body 23 Spring 24 Lock arm 25 Contact part

Claims (7)

A latch bolt 5 that is slidably guided and supported by the case 4, a spring 6 that moves and urges the latch bolt 5 in a direction to engage with the receiving bracket 2 provided on the opening frame 1, and an outer surface of the case 4. When the latch bolt 5 is disengaged against the urging force of the spring 6 and the latch bolt 5 is disengaged by the operation tool 7, the latch bolt 5 remains in the disengaged state. A latch lock having a hold mechanism for holding the position,
The hold mechanism is disposed adjacent to the periphery of the latch bolt 5 and slidably guided and supported along the latch bolt 5.
A spring 23 for moving and biasing the holding body 22 in the same direction as the biasing direction of the latch bolt 5;
A lock arm 24 supported by the latch bolt 5 so as to be able to move together and swinging between a standby posture and an engaging posture;
A contact portion 25 that switches the lock arm 24 to an engagement posture when the latch bolt 5 is operated to release the engagement against the spring 6;
A stopper piece 26 that is provided on the holding body 22 and receives and supports the rook arm 24 switched to the engagement posture so as not to be able to return and swing;
In a state in which the latch bolt 5 is disengaged by the operating tool 7, the advancing end of the holding body 22 is received and supported by the peripheral wall of the bracket 2, and the latch bolt 5 is held via the lock arm 24 and the stopper piece 26. A latch lock that is held in the body 22 so as not to advance. The holding body 22 is arranged in parallel to the engagement surface side of the latch bolt 5, and the latch bolt 5 is provided with an arm chamber 13 for accommodating the lock arm 24 and the stopper piece 26,
The lock arm (24) is formed in a bell crank shape with a first arm (29) received and supported by a stopper piece (26) and a second arm (30) operated by a contact portion (25) provided on the case (4). Latch lock. An indented handle case 8 is fixed to the outer surface of the case 4, a planar handle-like operating tool 7 for disengaging the latch bolt 5 is disposed in the handle case 8, and the operating tool 7 is a handle case by a spring 20. The latch lock according to claim 1, wherein the latch lock is urged to swing in a direction projecting from 8. The latch bolt 5 and the hold body 22 are slidably guided and supported by a main case 4a and a guide frame 4b fixed to the inner surface of the main case 4a, and an operation pin 17 fixed to the latch bolt 5 is provided on the guide frame 4b. The latch lock according to claim 1, 2, or 3, wherein an arm 7 b that protrudes from both sides and that disengages the latch bolt 5 via the operation pin 17 is provided on the operation tool 7. The latch bolt 5 is received by the main case 4a or the guide frame 4b, the advance limit of the latch bolt 5 is defined, the stopper piece 26 is received at one end of the arm chamber 13, and the advance limit of the hold body 22 is defined. The latch lock according to claim 2, 3 or 4. The latch lock according to claim 1, 2, 4, or 5, wherein the operation tool 7 includes a slide lever supported by the case 4 so as to be linearly slidable. The operation tool 7 is composed of a lever supported by the case 4 so as to be rotatable around a single axis 35, and the operation tool 7 is turned between the operation tool 7 and the latch rod 5 in a linear motion. 6. A latch lock according to claim 1, wherein a mechanism for conversion is provided.

Images