JPH0972168A - Lock mechanism for window opening closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably keep a lock state by a method wherein a panel plate can be left released by engaging the pin of a holding part with the holding groove of a bracket and slip-out of the pin in the holding groove from the holding groove is prevented from occurring. SOLUTION: A louver plate 2 is closed and locked and a pin 9 of a support part 6 is engaged with a holding groove 17 of a bracket 11 rotatably mounted on a support shaft 10 and the bracket 11 is made non-rotatable. In this case, a guide groove 22 in a direction from that of the holding groove 17 formed in a cam plate 20 is engaged with the pin and reliably held in a lock state. Further, in the lock state, an engaging piece 24 protruding from the cam plate 20 is engaged with an engaging pin 28 of other louver plate 2 and the reliable closing state of the louver plate 2 is practicable. Further, through rotation of the cam plate 20, the engaging pin 28 is reliably captured so as to pull the engaging pin 28 this side and brought into an engaging state. The adhering state of the louver plate 2 to a window frame 3 is brought into a reliable state to improve airtight ability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock mechanism for a window opening / closing device such as a louver arranged in a window of a building such as a house.

[0002]

2. Description of the Related Art An opening / closing device such as a louver is installed in a window portion of a building such as a house. The louver is a horizontally long strip-shaped louver plate made of a plurality of glass plates.
It consists of a bracket that holds both left and right ends of these louver plates and is pivotally attached to the window frame, is arranged in a plurality of rows in the vertical direction, and interlocks and connects each louver plate to the connecting rod.
The operation handle for operating the connecting rod simultaneously opens and closes to ventilate and illuminate the building.

In order to obtain airtightness between the louver plates and the window frame when the louver as described above is closed,
A lock mechanism is provided to hold the closed state. Conventionally, this locking mechanism has been disclosed in Japanese Utility Model Publication 58-50049.
As disclosed in Japanese Unexamined Patent Application Publication No. 2004-242, the louver is formed by hooking a lock pin projecting on a side edge of each louver plate onto a lock plate that is rotated by being pushed by a guide pin projecting on the connecting rod. A mechanism for locking the plate to the window frame, and a lock pin projecting on the side edge of each louver plate as disclosed in Japanese Utility Model Laid-Open No. 2-56293 are projected on the interlocking rod, A mechanism has been devised for locking the louver plate by engaging a locking piece that slides with the interlocking rod.

[0004]

However, in the above-mentioned conventional locking mechanism for the louver, the former (J.
No. 50049), a play is provided between the two grooves formed in the lock plate and the lock pin and the guide pin that engage with each groove in order to ensure smooth operation, and therefore the lock is performed. In this state, the free edge of each louver plate may rattle, and thus there is a drawback that the airtightness is not sufficient, and the lock plate is mounted in a swingable pivotally mounted state and is activated by rotation by its own weight. Therefore, there is a drawback of lacking reliability.

Further, in the case of the latter lock mechanism (Japanese Utility Model Laid-Open No. 2-56293), the locking is performed by the movement of the interlocking rod, and the locking piece to be brought into the locked state is based on the linear movement. Therefore, the louver plate that swings and opens and closes, that is, the louver plate that moves in an arc is captured and locked by the locking piece that moves linearly.
There is a possibility that a reliable operation may not be performed, and the louver plate is caught and engaged by the locking piece, but it is not an operation to pull this louver plate, so it is not enough to make it adhere firmly to the window frame side. It has the drawback that

Therefore, in order to solve the above-mentioned problems, the present invention, in a window opening and closing device such as a louver, when a panel plate such as a louver plate is closed, the closed state is held and brought into a locked state. It is an object of the present invention to provide a lock mechanism for a window opening / closing device that enables smooth and accurate operation, and reliably holds a locked state.

[0007]

[Means for Solving the Problems] Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments. The lock mechanism 5 of the window opening / closing device 1 of the present invention
Is a window opening / closing device in which the connecting rod 4 is slid along the window frame 3 by the operation handle, and the panel plate 2 pivotally mounted on the connecting rod 4 can be freely opened and closed. A long slot 8 is formed in the same direction as the sliding direction of the connecting rod 4, and a support 6 having a pin 9 projecting in the vicinity of the long slot 8 and a long slot of the support 6 are provided. And a support shaft 10 which is pivotally attached to the slide shaft 8 and is slidable along the elongated hole 8.
And a holding groove 17 which is rotatably supported by the support shaft 10 and is formed along the plate surface of the panel plate 2 to have a length equal to that of the elongated hole 8 and engages with the pin 9. , A guide arc portion 1 formed of an arc concentric with the shaft support portion (10)
6 is continuously formed in the holding groove 17, and the panel plate 2
A bracket 11 fixed to an end edge of the bracket 11 and a bracket 11 overlapping the bracket 11 and rotatably supported by the support shaft 10.
A cam plate 20 having a bent guide groove 22 for guiding the movement of the pin 9 with respect to the support shaft 10, the cam plate 20 being constantly engaged with the pin 9;
When the panel plate 2 is slid to open the panel plate 2, the supporting portion 6 moves together with the connecting rod 4 to move the supporting shaft 10
Moves along the long hole 8 and the pin 9 of the supporting portion 6 slips out of the holding groove 17 of the bracket 11,
Moreover, the cam plate 20 is rotated by the movement of the pin 9,
Further, the guide arc portion 16 of the bracket 11 moves along the pin 9 as the sliding connecting rod 4 moves.
When the connecting rod 4 slides in the opposite direction to close the panel plate 2, the guide arc portion 1 of the bracket 11 is closed.
6 moves along the pin 9, engages the pin 9 in the holding groove 17, and the pin 9 moving in the holding groove 17 moves in the guide groove 22 to move the cam. The plate 20 is rotated, and at the same time, the support shaft 10 is moved along the elongated hole 8.

In this closed state, the holding groove 17 and the guide groove 22 are substantially orthogonal to each other, so that the engaged state with the pin 9 is surely maintained and the locked state is established.

An engaging piece 24 is provided on the cam plate 20 so as to project, and the cam plate 20 is rocked on another panel plate 2 which is disposed adjacent to the panel plate 2 and is close to the pivot center of the panel plate 2. It is also possible to engage with the engagement pin 28 that is provided so as to project from the moving edge.

In this case, when the panel plate 2 is closed, the cam plate 20 captures the swinging edge of another adjacent panel plate 2 and pulls the swinging edge of this panel plate 2 toward the window frame 3 side. Becomes

[0011]

1 is a side sectional view showing an embodiment of a lock mechanism of a window opening / closing device according to the present invention, FIG. 2 is a front sectional view of the same, and FIG. 3 is an exploded side view thereof.

First, the window opening / closing device 1 is a louver disposed in a window portion of a building such as a house, as described in the prior art, and has a horizontally long strip shape made of a glass plate as a panel plate. The louver plates 2 are arranged in a plurality of rows vertically, and the louver plates 2 are connected to the connecting rods 4 that slide along the window frame 3 at both left and right ends. By sliding the connecting rods 4, each louver plate 2 is connected. Are opened and closed at the same time to perform ventilation and lighting. Although not shown,
The mechanism for sliding the connecting frame 4 along the window frame 3 is composed of a slider crank mechanism, and the connecting rod is slid through the link bar by rotating the operation handle.

The lock mechanism 5 of this embodiment provided on the louver 1 includes a support portion 6 and a support shaft 10.
And a bracket and a cam plate.

First, as shown in FIG. 2, the support portion 6 is a plate member having a pair of leg portions 7 each having a substantially L-shaped cross section, and is vertically moved vertically along the left and right window frames 3. It is provided on the connecting rod 4 which is slidably provided.

As shown in FIGS. 1 and 3, the supporting portion 6 has a long hole 8 formed substantially in the center of the plate surface in the sliding direction of the connecting rod 4, that is, in the vertical direction. In addition, in this support portion 6, a pin 9 is provided with respect to the plate surface in the vicinity of the elongated hole 8 and at a position obliquely below the elongated hole 8 on the opening side of the louver plate 2 described later in the present embodiment. It is projected. In addition,
A plurality of the supporting portions 6 are arranged on the connecting rod 4 for each louver plate 2.

Next, the support shaft 10 is, as shown in FIG.
A shaft body having a large diameter portion 10a, a small diameter portion 10c, and an intermediate portion 10b having a plurality of outer diameters, and a head portion 10d at the end portion on the large diameter portion 10a side. Further, it is slidably and pivotally mounted along the longitudinal direction of the elongated hole 8. The large diameter portion 10a of the support shaft 10 is pivotally attached to the elongated hole 8, the head portion 10d contacts the back surface of the support portion 6, and the tip of the shaft protrudes horizontally with respect to the connecting rod 4. It is installed so that Also, this support shaft 10
After the bracket and the cam plate, which will be described later, are attached, the shaft tip 10e is fixed by caulking or the like to prevent them from coming off.

Next, as shown in FIGS. 1 and 3, the bracket 11 includes a disc-shaped shaft support portion 12 and a rectangular plate-shaped mounting portion 13 extending from a part of the shaft support portion 12. The plate member is formed in a substantially P shape.

The shaft support 12 has a support hole 14 formed therethrough at substantially the center thereof. The support shaft 10 is inserted into the support hole 14 and is rotatably attached to the support shaft 10. The support holes 14 are
A washer 15 is pivotally attached to the intermediate portion 10b of the support shaft 10 and is provided between the surface of the support portion 6 and the washer 15 for reducing rotational friction.

Further, the mounting portion 13 at the peripheral edge of the shaft support portion 12
A guide arc portion 16 formed of an arc concentric with the support hole 14 is formed in a portion close to the support hole 14 as a center. The length of the arc of the guide arc portion 16 is set in correspondence with the rotation angle (opening / closing angle) of the louver plate 2,
A holding groove 17 is continuously formed at one end of this arc, and a stopper piece 18 is formed so as to project at the other end.

As shown in FIG. 3, the holding groove 17 is formed in a portion where the shaft support portion 12 and the mounting portion 13 are connected to each other, and is different from the radial direction with the support hole 14 as the center.
It is formed in a straight line that is parallel to the extending direction of the attachment portion 13 that extends with respect to the shaft support portion 12.

The groove length of the holding groove 17 is substantially the same as the length of the long hole 8 of the supporting portion 6, that is, the moving distance of the pin 9 of the supporting portion 6 moving in the holding groove 17. And the sliding distance of the support shaft 10 sliding in the support portion elongated hole 8 are set to be substantially equal to each other, and the center of the opening side of the holding groove 17 and the center of the supporting hole 14 are connected. The distance Lc and the distance Ld connecting the center of the innermost side of the holding groove 17 and the center of the support hole 14 respectively connect the center of one end (upper end) of the elongated hole 8 and the center of the pin 9 in the support portion 6. La and slot 8
The distance Lb connecting the center of the other end (lower end) and the center of the pin 9 is set to substantially match.

As described above, the bracket 11 is attached to the support shaft 10 and the support portion 6
The pin 9 projecting from the supporting portion 6 is located in the holding groove 17 or at the peripheral edge of the guide arc portion 16.

The mounting portion 13 is, as shown in FIG.
The middle is bent in a substantially Z shape, and the upper edge 2a side of the edge of the louver plate 2 is fixed to the plate surface on the tip side, that is, the support hole 14 of the bracket 11 is the swing center of the louver plate 2. Becomes In this fixed state, the longitudinal direction of the holding groove 17 described above is along the plate surface of the louver plate 2.

Next, as shown in FIGS. 1 and 3, the cam plate 20 is a plate member formed with a pivotal hole 21 and formed in a substantially fan shape, and has an arc shape with the pivotal hole 21 as the center. The radius of the outer peripheral edge is larger than the radius of the guide arc portion 16 of the bracket 11, and in the present embodiment, the pin 9 of the support portion 6 is used.
Is formed to be long by about the diameter.

Further, the cam plate 20 is formed with a guide groove 22 which is bent in the middle. The length of the guide groove 22 is, as shown in FIG.
And a distance Le connecting the center of the opening side of the guide groove 22 and the center of the pivot hole 21 and the innermost side of the guide groove 22. The distance Lf connecting the center of the long hole 8 and the center of the pivot hole 21 is respectively the distance La connecting the center of one end of the long hole 8 and the center of the pin 9 in the support portion 6, the center of the other end of the long hole 8, and the pin 9. The distances Lb connecting the centers of are substantially set. In addition, the bending portion 23, which is the bending position of the guide groove 22, extends from the center of the pivot hole 21 to the bracket 1
The length is set to be equal to the radius of the first guide arc portion 16.

An engaging piece 24 is provided on one side of the cam plate 20 so as to project therefrom. As shown in FIG. 2, the engagement piece 24 is formed by bending the middle part so as to project with respect to the plate surface of the cam plate 20, and has a wedge-shaped tip.

As shown in FIG. 4, the cam plate 20 has a collar member 25 attached to the pivot hole 21 and is attached to the small diameter portion 10c of the support shaft 10 so as to overlap with the bracket 11. It is rotatably pivotally attached and attached to the support portion 6, and the guide groove 22 is attached so as to be constantly engaged with the pin 9.

When the cam plate 20 is attached to the support portion 6, the bending direction of the guide groove 22 is set so as to face the elongated hole 8 from the opening portion toward the back, and at this bending position. When the support shaft 10 is located at the upper end 8a of the elongated hole 8, the bending angle of the guide groove 22 is perpendicular to the bent portion 23, and the support shaft 10 has the lower end 8 of the elongated hole 8.
When positioned at b, the angle is such that the inner side of the guide groove 22 with respect to the bent portion 23 becomes horizontal.

Further, one end of a support link 27 is rotatably connected to the edge of each louver plate 2 in the vicinity of the mounting portion 13 of the bracket 11, and is connected to the window frame 3, and this edge swings. An engagement pin 28 is provided so as to project on the lower edge 2b side, which is the moving end side.

Next, the operation of the lock mechanism 5 having the above structure will be described. First, the louver board 2 is closed,
The operation of opening the louver plate 2 from the locked state (see FIG. 1) in the closed state will be described.

When the operation handle is rotated from the closed lock state in which the louver plate 2 is vertically closed along the window frame 3 and the connecting rod 4 is raised, the connecting rod 4 is moved by the link mechanism. The slide movement starts downward, that is, the support portion 6 descends.

As shown in FIG. 5, when the supporting portion 6 descends, the supporting shaft 10 pivotally attached to the elongated hole 8 of the supporting portion 6.
Is from the lower end 8b to the upper end 8a of the elongated hole 8.

At the same time, the pin 9 of the support portion 6 is moved to the opening side from the inner side of the holding groove 17 of the bracket 11, and the pin 9 is moved to the guide groove 22 of the cam plate 20.
The cam plate 20 is rotated by moving inside. The position of the pin 9 in the guide groove 22 of the cam plate 20 is on the groove opening side.

When the cam plate 20 is rotated, the cam plate 20 is engaged with the engagement pin 28 of another louver plate 2 that is captured by the engagement piece 24 and is in an engaged state and is adjacent to the upper louver plate 2. Solve the condition.

In this state, the louver plate 2 remains closed and the closed lock is released (see FIG. 5).

Further, when the operation handle is rotated, the connecting rod 4 slides further downward, and with this movement, the louver plate 2 is supported by the support shaft 1 via the support link 27 and the like.
Swing around 0 to open.

At this time, the support shaft 10 is pushed downward at the position of the upper end 8a of the long hole 8 of the support part 6 because the support part 6 continues to move downward together with the connecting rod 4. As a result, the guide arc portion 16 of the bracket 11, which is a pivotal portion of the louver plate 2 with the connecting rod 4, becomes the pivot (swing) center at this position. It comes into sliding contact and moves along this pin 9.

Then, the stopper piece 18 of the bracket 11
At the position where the pin 9 abuts on the louver plate 2, the louver plate 2 is fully opened (see FIG. 6).

Next, the operation of closing the louver plate 2 in the open state will be described. In the open state of the louver plate 2, the connecting rod 4 is located below as shown in FIG.

When the operating handle is rotated in the direction opposite to the above-described rotating direction, the linking mechanism causes the connecting rod 4 to start sliding upward, that is, the supporting portion 6 starts to move vertically.

When the support portion 6 rises, the pin 9 of the support portion 6 pushes up the guide arc portion 16 of the bracket 11, and the guide arc portion 16 starts moving along the pin 9.
At this time, the elongated hole 8 of the support portion 6 also rises, and the distance between the peripheral edge of the guide arc portion 16 and the center of the support shaft 10 does not change, so that the support shaft 1 is attached to the upper end 8a of the elongated hole 8.
0 remains in place.

When the guide arc portion 16 of the bracket 11 moves along the pin 9 as the connecting rod 4, that is, the support portion 6 moves upward, the louver plate 2 moves upward to move the support shaft 10.
Swing in the closing direction around.

As shown in FIG. 5, the position of the pin 9 of the supporting portion 6 is changed from the guide arc portion 16 of the bracket 11 to the holding groove 17 thereof.
On the opening side of the louver plate 2, the louver plate 2 is in a closed state perpendicular to the window frame 3.

Furthermore, while the louver plate 2 remains closed,
When the operating handle is rotated and the connecting rod 4 is raised, the pin 9 of the supporting portion 6 moves upward in the holding groove 17 of the bracket 11 which is vertical.

At the same time, the pin 9 moves from the position of the opening of the guide groove 22 of the cam plate 20 in the depth direction of the guide groove 22, and along with this movement, the pin 9 supports the cam plate 20.
Also, the support shaft 10 descends along the elongated hole 8 of the support portion 6 toward the lower end 8b.

Then, the pin 9 of the supporting portion 6 becomes the innermost position of the holding groove 17 and the innermost position of the guide groove 22, and the ascending of the connecting rod 4 is stopped. In this state, the holding groove 1
As shown in FIG. 1, the guide groove 7 and the guide groove 22 are orthogonal to each other, and the pin 9 of the supporting portion 6 is in an engaged state so that the pin 9 cannot be pulled out. The louver plate 2 is in a locked state that holds the closed state.

The rotation of the cam plate 20 causes the engagement piece 24 to move the other louver plate 2 above the louver plate 2.
The engagement pin 28 is engaged with the louver plate 2 so that the louver plate 2 is locked at the swing end side.

Therefore, the window opening / closing device 1 configured as described above
In the lock mechanism 5 of FIG. 2, when the louver plate 2 is closed and locked, the pin 9 of the support portion 6 is engaged with the holding groove 17 of the bracket 11 pivotally mounted to the support shaft 10 in a rotatable manner. , The bracket 11 cannot be rotated about the support shaft 10, that is, the louver plate 2 cannot be opened, and the pin 9 in the holding groove 17 is fixed to the holding groove 17.
Since the guide groove 22 formed in the cam plate 20 in a direction different from that of the holding groove 17 is engaged with the pin 9 so as not to slip out of the cam plate 20, the locked state can be reliably maintained.

In this locked state, the engagement piece 24 projecting from the cam plate 20 is engaged with the engagement pin 28 of the other louver plate 2 so that the louver plate 2 is closed. This cam plate 20 is made more reliable.
Since it rotates, the engaging pin 28 is surely captured so as to be pulled and brought into the engaged state, so that the louver plate 2 is firmly attached to the window frame 3, and the airtightness is improved.

When the locked state is released, the bracket 11 and the cam plate 20 in which the holding groove 17 and the guide groove 22 are formed serve as the same pivotally attached portion, that is, the support shaft 10, and The support shaft 10 is the support portion 6
Since the axial center position is changed by sliding along the long hole 8 of the pin 9, the pin 9 engaged with the holding groove 17 and the guide groove 22 at the time of locking moves as the supporting shaft 10 slides, and The louver plate 2 is released from the grooves 17 and 22 and the bracket 11 is rotatable with respect to the pin 9, that is, the louver plate 2 is swingable, and the pin 9 extends along the pin 9 that has come out of the holding groove 17. The bracket 11 is rotated by being guided by the guide arc portion 16 centered on the support shaft 10, so that the opening operation of the louver plate 2 is stably performed.

Further, the operation of closing the operating handle, which is a continuous operation of the sliding movement of the connecting rod 4 in the closing direction, causes the above-mentioned pin 9 to engage with the holding groove 17, and at the same time, the cam plate 20 is rotated. Since the pin 9 is engaged in the guide groove 22, the louver plate 2 can be locked by only closing the louver plate 2.

Since the guide groove 22 of the cam plate 20 is always engaged with the pin 9 when the louver plate 2 is opened and closed and when the louver plate 2 is closed and locked, the cam plate 20 is supported by the support shaft 10 and the pin 9. The louver plate 2 is supported at all times and operates stably without wobbling, whereby the louver plate 2 can be stably opened and closed, and the louver plate 2 can be reliably locked and closed.

Further, the lock mechanism 5 has a structure for performing both operations of guiding the opening and closing of the louver plate 2 and locking the louver plate 2 when the louver plate 2 is closed.
A support portion 6 provided on a connecting rod 4 that connects each louver plate 2 and a bracket 11 that is a pivotally attached portion of each louver plate 2.
Since the cam plate 20 and the cam plate 20 are each plate-shaped and have a simple structure, space saving can be realized and the cam plate 20 can be formed in the window frame 3.

In the above embodiment, the window opening / closing device 1 has been described with respect to the louvers having the louver plate 2 as a panel plate which is long in the left and right directions and which is provided in a plurality of rows in the vertical direction. Alternatively, a plurality of vertically long panel plates 2 may be arranged in parallel in the left-right direction so as to stand upright and interlock with each other to open and close, and the same effect as described above can be obtained.

[0055]

As described above, in the lock mechanism of the window opening / closing device according to the present invention, when the panel plate is closed and locked, the holding portion is provided in the holding groove of the bracket pivotally attached to the support shaft. By engaging the pins of, the bracket cannot be rotated about the support shaft, that is, the panel plate cannot be opened, and the pin in the holding groove is
Since a guide groove formed in the cam plate in a direction different from that of the holding groove is engaged with the pin so as not to slip out of the holding groove, there is an effect that the locked state can be reliably maintained.

Further, in this locked state, the engagement piece projecting from the cam plate engages with the engagement pin of the other panel plate, so that the closed state of the panel plate is made more reliable. At the same time, since the cam plate rotates, the engagement pin is surely caught so as to be pulled and brought into the engaged state, so that the panel plate is firmly attached to the window frame and the airtightness is excellent. The effect of becoming is obtained.

Further, the locking operation is an operation that is continuous with the sliding movement of the connecting rod in the closing direction, which is the closing operation of the operation handle. By this operation, the pin engages in the holding groove and at the same time the cam plate rotates. Since the pin is engaged with the guide groove by moving, the panel plate can be locked by only the closing operation of the panel plate.

Further, when the panel plate is opened after the pin is pulled out from the holding groove after the locked state is released, the pin is attached to the guide arc portion centered on the support shaft which is the pivot portion. Is guided and the bracket is rotated, so that there is an effect that the panel plate can perform the opening operation stably around the support shaft.

Also, since the guide groove of the cam plate is always in engagement with the pin regardless of the opening / closing operation of the panel plate and the closing lock, the cam plate is always supported by the support shaft and the pin. It is possible to obtain the effect that the operation of the cam plate is performed stably without wobbling, and the positional relationship of the support shaft with respect to the pin is maintained, whereby the opening and closing stability of the panel plate can be obtained.
Further, since the cam plate surely and smoothly interlocks with the operation, there is an effect that the closing lock of the panel plate is surely performed.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of a lock mechanism of a window opening / closing device according to the present invention.

FIG. 2 is a front sectional view of the same.

[Figure 3] The same exploded side view

FIG. 4 is an enlarged front sectional view of the same portion.

FIG. 5 is a side sectional view showing the operation of the lock mechanism.

FIG. 6 is a side sectional view showing the operation of the lock mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Window opening / closing device (louver) 2 ... Panel plate (louver plate) 3 ... Window frame 4 ... Connection rod 5 ... Lock mechanism 6 ... Supporting part 8 ... Long hole 9 ... Pin 10 ... Support shaft 11 ... Bracket 16 ... Guide arc Part 17 ... Retaining groove 20 ... Cam plate 22 ... Guide groove 24 ... Engaging piece 28 ... Engaging pin

Claims (2)

[Claims] 1. A window opening / closing device in which a connecting rod is slid along an window frame by an operating handle, and a panel plate pivotally attached to the connecting rod can be freely opened and closed by swinging the connecting rod. A long hole is bored in the same direction as the sliding direction of the rod, and a support portion having a pin projecting in the vicinity of the long hole is pivotally attached to the long hole of the support portion. A support shaft that is slidable along the long hole, and is rotatably supported by the support shaft. The support shaft is formed to have the same length as the long hole along the plate surface of the panel plate and engages with the pin. A bracket having a holding groove and a guide arc portion formed of an arc concentric with the shaft support portion is continuously formed in the holding groove, and is fixed to an edge of the panel plate, and is overlapped with the bracket. It is rotatably supported by the support shaft and is always engaged with the pin. And a cam plate having a guide groove for guiding the movement of the pin with respect to the support shaft. When the connecting rod is slid to open the panel plate, the supporting portion moves together with the connecting rod. And the support shaft moves along the long hole, the pin of the support part comes out of the holding groove of the bracket, and the cam plate is rotated by the movement of the pin, and the sliding connecting rod moves. With this, the guide arc portion of the bracket moves along the pin, and when the connecting rod slides in the opposite direction to close the panel plate, the guide arc portion of the bracket moves along the pin. , The pin is engaged in the holding groove, and the pin moving in the holding groove moves in the guide groove to rotate the cam plate, and at the same time, the support shaft is moved along the elongated hole. Let Locking mechanism of the window opening and closing device for causing moved. 2. An engaging piece is projectingly provided on the cam plate, and the engaging piece is projected on a swinging edge of another panel plate which is arranged adjacent to the panel plate and is close to the swing center of the panel plate. The lock mechanism for a window opening / closing device according to claim 1, wherein the lock mechanism is engaged with an engagement pin provided.