JPH07217309A - Opening-closing operating device for window - Google Patents

Abstract

PURPOSE:To hold a window at a desired position of opening by properly combining a clutch mechanism connecting a shaft and a gear with a stopping mechanism to reverse rotation. CONSTITUTION:A link mechanism 23 connected to an arm 11 is bent and engagement with a ratchet teeth 16 of a pawl link 18 is released when a ball chain 96 is pulled and a shaft 3 is turned, and a body of revolution 15 is also rotated and engagement with the ratchet teeth 16 of a pawl member 57 is released when the arm 11 is revolved. A ratchet 17 and a gear 4 can be tuned freely, a rope is delivered, and the wind-up drum 6 can be rotated freely, thus delivering the wire rope while opening a window. When the ball chain 96 is drawn and the arm 11 is revolved in the direction B during the delivery of the wire rope, the link mechanism 23 is elongated, and transmitted over the body of revolution 15. A gear 42 is rotated by revolution in the direction B of the body of revolution 15 and the pawl member 57 is engaged with the ratchet teeth 16, thus resulting in the impossibility of the free revolution of the ratchet 17, then stopping the opening of the window during the opening.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for opening and closing windows such as ventilation windows and smoke exhaust windows.

[0002]

2. Description of the Related Art An opening / closing device of this type is provided with an operating handle and a release button as disclosed in, for example, Japanese Patent Publication No. 3-39146, and when the window is closed, the rotating drum is operated by the operating handle. The wire is rotated to wind the wire, and when the window is opened, the release button is pressed to freely rotate the rotary drum so as to pay out the wire.

[0003]

In the opening / closing operation device as described above, the opening / closing of the window is performed by different operation mechanisms of the operation handle and the release button, so that the opening / closing operation device is mounted at a high place, for example. In such a case, it is necessary to hang two operating members of two systems, that is, an operating member replacing the operating handle for rotating the rotary drum and an operating member for operating the release button, for example, two ball chains to the lower side that can be manually operated. . Further, in the opening of the window by the release button of the opening / closing operation device, once the release button is pressed, the window is fully opened, and it is not possible to stop the opening halfway.
Therefore, for example, the above-mentioned opening / closing device is not suitable for a window such as a ventilation window in which air volume control is required, and it is difficult to avoid the danger of opening the window.

The present invention has been made in view of the above points, and an object thereof is to enable opening and closing of a window with a single-system operation member, and additionally to stop the opening of the window on the way. An object of the present invention is to provide a window opening / closing device that can be operated.

[0005]

According to the present invention, the above-mentioned object is to provide a shaft, a gear rotatably mounted on the shaft, a rope feeding / rewinding drum meshingly connected to the gear, and a shaft. In the rotation in one direction from the rotation stopped state, the connection between the shaft and the gear is released to allow the gear to freely rotate in the one direction, and in the rotation in the other direction from the rotation stopped state, the shaft is rotated. The clutch mechanism that connects the shaft and the gear so as to transmit the rotation in the other direction to the gear, and the rotation in the opposite direction from the rotation in the one direction of the shaft prevents the rotation of the gear in the one direction. And a blocking mechanism for opening and closing the window.

In one preferable example of the clutch mechanism, an arm fixed to a shaft and the arm are contained, and two protrusions spaced from each other on which the arm abuts when the arm rotates are provided on the inner peripheral surface. The rotary body rotatably mounted on the shaft, the ratchet wheel that has ratchet teeth on the outer periphery and is integrally mounted on the gear, and the ratchet wheel ratchet when the shaft rotates in one direction from the stopped state. The engagement with the teeth is released,
When the shaft rotates in the other direction from the stopped state, it has a pawl link that meshes with the ratchet teeth of the ratchet wheel, and one end is rotatably connected to the rotating body and the other end is connected to the arm. The blocking mechanism includes a gear integrally formed on the outer circumference of the rotating body, a cam disk meshingly connected to the gear, and having a cam groove on the side surface, and one end The arm, which is rotatably provided by engaging with the cam groove of the cam disk, is rotatably connected to this arm. When the shaft is stopped in one direction, the arm moves into the cam groove. When guided and rotated in one direction, the ratchet teeth of the ratchet wheel are disengaged, and the arm is guided in the cam groove by the rotation in the opposite direction from the rotation in one direction of the shaft. When it is rotated in one direction, the ratchet wheel is locked so as to prevent rotation in one direction of the ratchet wheel. It may be configured by further comprising a claw member that meshes with a tooth, and instead of this, the rotation position of the arm is frictionally held by the rotation from the rotation in one direction of the shaft to the reverse rotation thereto, and the claw member is retained. A friction holding member provided on the rotating body so as to maintain the engagement of the ratchet wheel of the link with the ratchet tooth, a ratchet tooth integrally formed on the outer periphery of the rotating body, and a claw member that meshes with the ratchet tooth. And may be configured.

In a preferred example of the link mechanism according to the present invention, one end of the link mechanism is rotatably connected to the rotating body, and the other end of the link mechanism is rotatably connected to the arm. It consists of links that are movably connected.

A chain wheel may be attached to the shaft, an output shaft of the motor may be connected, or an operation handle may be attached, or a combination of these may be connected and attached. .

The present invention may further comprise a braking device for imparting rotational braking to the rope payout / winding drum, in which case it is attached to a rotary shaft having a gear meshed with the gear. The braking device may be formed by including a brake shoe and a brake drum attached to the rope feeding / winding drum so that the outer peripheral surface of the brake shoe makes frictional contact.

[0010]

In the window opening / closing operation device of the present invention, for example, when the shaft is rotated in the one direction from the rotation stop state, the connection between the shaft and the gear is released, and the gear is allowed to freely rotate in the one direction. As a result, the rope feeding / winding drum connected to this gear is also allowed to freely rotate, and as a result, the rope wound on the rope feeding / winding drum is fed by the urging force acting on the window to When the shaft is rotated in the other direction from the rotation stopped state, the clutch mechanism connects the shaft and the gear so that the clutch mechanism transmits the rotation in the other direction to the gear. Then, as a result of the rope pay-out / take-up drum connected to this gear being rotated in the other direction, the rope is taken up by the rope pay-out / take-up drum to close the window, When rotating from one direction to the opposite, Blocking mechanism to prevent rotation of the one direction of the gear, Thus to rope feeding-coupled to the gear
The rotation of the take-up drum is likewise blocked, the feeding of the rope is stopped and the window is held in its open position.

The present invention will now be described in more detail based on the preferred embodiments shown in the drawings. The present invention is not limited to these specific examples.

[0012]

SPECIFIC EXAMPLE Referring to FIGS. 1 to 5, a window opening / closing device 1 according to the present embodiment includes a shaft 3 rotatably supported by a housing 2.
A gear 4 rotatably mounted on the shaft 3, a rope payout / winding drum 6 connected to the gear 4 via a gear mechanism 5, and rotation of the shaft 3 in one direction from a stopped state, that is, In the rotation in the A direction, the connection between the shaft 3 and the gear 4 is released to allow the gear 4 to freely rotate in the A direction. When the rotation of the shaft 3 is stopped in another direction, that is, in the B direction. , A clutch mechanism 7 that connects the shaft 3 and the gear 4 so as to transmit the rotation of the shaft 3 in the B direction to the gear 4, and the A of the shaft 3.
From the rotation in the direction to the opposite rotation, that is, in the rotation in the B direction, a blocking mechanism 8 for blocking the rotation of the gear 4 in the A direction is provided.

The clutch mechanism 7 of the present embodiment includes an arm 11 fixed to the shaft 3 and the arm 11 inside.
In one rotation, the rotating body 15 has two protrusions 12 and 13 separated from each other, which are brought into contact with the tip of the arm 11 on the inner peripheral surface 14, and is rotatably provided on the shaft 3, and a ratchet tooth 16 on the outer periphery. In the rotation in the direction A from the rotation stop state of the shaft 3 and the ratchet wheel 17 that is integrally provided with the gear 4,
When the ratchet wheel 16 is disengaged from the ratchet wheel 17 and the shaft 3 is rotated in the B direction from the rotation stopped state, the ratchet wheel 16 has a ratchet link 18 that meshes with the ratchet tooth 16 at one end 1
9 to the rotating body 15 via the pin 20, and the other end 21 to the pin 2
The link mechanism 23 is rotatably connected to the arm 11 via the link mechanism 23. Link mechanism 2 of this example
3, the one end 19 has the claw link 18 rotatably connected to the rotating body 15, and the claw link 18 has one end 31 having a pin 32.
The other end 21 includes a link 34 that is rotatably connected to the arm 11 and is rotatably connected to the arm 11.

The blocking mechanism 8 includes a gear 41 integrally formed on the outer periphery of the rotating body 15 and a gear 42 meshing with the gear 41.
A shaft 45 to which the gear 42 is fixedly rotatably supported by the housing 2, a cam disk 46 having a cam groove 44 on the side surface 43 and fixed to the shaft 45, and integrally provided at one end 51. The protruding portion 52 engages with the cam groove 44 of the cam disk 46 and is rotatably connected to the arm 55 via the shaft 54 and the arm 55 rotatably provided on the housing 2 via the pin 56. When the arm 55 is guided by the cam groove 44 and rotated in one direction, that is, the C direction by the rotation of the shaft 3 in the A direction from the rotation stopped state of the shaft 3, the ratchet teeth 16 of the ratchet wheel 17 are moved to the ratchet teeth 16. When the engagement is released and the rotation of the shaft 3 in the A direction to the B direction causes the arm 55 to be guided by the cam groove 44 and be rotated in the other direction, that is, in the D direction, the ratchet wheel 17 moves. The ratchet teeth 16 of the ratchet wheel 17 are engaged to prevent rotation in the A direction. Cormorants are and a claw member 57. The cam groove 44 is an annular groove 4 communicating with the spiral groove 44a.
4b and.

The gear mechanism 5 includes a shaft 61 rotatably mounted on the housing 2, a gear 62 meshed with the gear 4 and fixed to the shaft 61, and a gear 63 fixed to the shaft 61.
It is equipped with a gear 66 that meshes with the gear 63 and is fixed to the flange portion 64 of the rope pay-out / take-up drum 6 via a screw 65, and transmits the rotation of the gear 4 to the rope pay-out / take-up drum 6. .

The rope paying-out / winding drum 6 is rotatably supported by the housing 2 via a shaft 71 on the one hand and a flange holding member 72 on the other hand, and the flange holding member 72 has a screw 73. The outer peripheral surface of the flange portion 64 is rotatably held so as to be wrapped from the outside.

The opening / closing operation device 1 of this embodiment is provided with a rope feeding /
A braking device 81 that applies rotational braking to the winding drum 6 is further provided, and the braking device 81 includes the gear 62 of the gear mechanism 5.
And a gear 84 rotatably supported by a shaft 82 attached to the housing 2 and a gear 84 that meshes with the gear 83.
A rotating shaft 85 rotatably supported by the winding drum 6;
The pin 86a fixed to the rotating shaft 85 and the pin 8 attached to the rotating shaft 85 by the centrifugal force generated by the rotation of the rotating shaft 85.
A pair of brake shoes 86, which are guided radially by 6a and are movable outward in the radial direction, and a brake drum 89 attached to the rope feeding / rewinding drum 6 so that the outer peripheral surface 87 of the brake shoes 86 makes frictional contact. It has and. A friction plate or a brake lining is attached to the inner surface of the brake drum 89.

In this example, a ball chain wheel 95 is attached to the shaft 3, and a ball chain 96 is hung on the ball chain wheel 95.

The pin 1 attached to the rotating body 15
A spring 101 is wound around and attached to 00, and one end 102 of the spring 101 has a rotating body 15
The other end 104 of the spring 101 is engaged with the arm 11 respectively by the protrusion 103 of the spring 101, and the spring 101 urges the arm 11 to rotate in the A direction, and after the arm 11 rotates in the A direction, the spring 101 is moved by its own weight or the like. The arm 11 is prevented from being unnecessarily rotated in the B direction. Further, an annular spring 111 whose one end 110 is attached to the rotating body 15 and whose other end is a free end is arranged so as to come into contact with the annular protrusion 112 of the housing 2 so as to make almost one turn. When the arm 11 rotates in the B direction, frictional contact with the annular protrusion 112 overcomes the force that prevents the pawl link 18 and the ratchet wheel 17 from engaging with each other via the arm 11 of the spring 101, so that the pawl link 18 is securely held. Claw wheel 17
To mesh with. That is, the annular spring 111
Serves to prevent the pawl link 18 from idling without engaging with the pawl shaft 17 during rotation in the B direction. Further, a spring 121 is wound around and attached to the pin 56, and one end 122 of the spring 121 is attached to the claw member 5.
7, the other end 124 of the spring 121 is engaged with the arm 55, and the spring 121 urges the pawl member 57 to rotate and secures the engagement of the ratchet wheel 16 of the ratchet wheel 17.

The opening / closing operation device 1 formed as described above
For example, as shown in FIG. 6, it is attached to a vertical window frame 132 of a ventilation window or smoke exhaust window 131 arranged at a high place, and the ball chain 96 hangs down to a position where it can be manually operated. Here, one end of the wire rope 141 hung around the pulley 136 attached to the upper frame 134 and the frame of the shoji 135 is connected to the rope feeding / winding drum 6, and the other end is connected to the vertical window frame 137. Cage, shoji 1
35 is urged in the opening direction by the opening mechanism 138,
It is rotatably attached to the lower frame 139 via a hinge mechanism.

The opening / closing device 1 described above operates as follows. When the wire rope 141 is wound around the rope payout / winding drum 6 and the window 131 is in the closed state, the arms 11 and 55 are in the states of FIGS. 2 and 4.
In this state, the ball chain 96 is pulled to run, and the shaft 3 is rotated via the ball chain wheel 95 to rotate the arm 11 in the A direction, and the link mechanism 23 connected to the arm 11 is moved as shown in FIG. Was bent into
When the engagement of the pawl link 18 with the ratchet teeth 16 is released and the arm 11 is further rotated in the A direction, the arm 1
1 contacts the projection 13 and the rotation of the arm 11 causes the rotation body 1 to rotate.
5, the rotary body 15 is also rotated in the A direction. When the rotating body 15 rotates in the A direction, the gear 42 that meshes with the gear 41 integrally formed on the outer periphery of the rotating body 15 rotates. As a result, the cam disk 46 also rotates, and the rotation of the cam disk 46 causes the cam to rotate. The arm 55 is rotated in the C direction by the guide movement of the protrusion 52 by the spiral groove 44a of the groove 44, and thus, FIG.
As shown in FIG. 5, the engagement of the pawl member 57 with the ratchet teeth 16 is released, and the pawl wheel 17 can freely rotate. Claw wheel 17
When the gear becomes free to rotate, the gear 4 formed integrally therewith
Also becomes freely rotatable, and as a result, the rope paying-out / winding drum 6 can freely rotate. As a result, the wire rope 141 wound around the rope paying-out / winding drum 6 is urged by the opening mechanism 138 to pay out the rope. The window 131 is unwound from the winding drum 6, and the window 131 is opened when the wire rope 141 is unwound. Here, the rotation of the rope unwinding / winding drum 6 during the unwinding of the wire rope 141 is transmitted to the brake shoe 86 through the gear mechanism 5 in the reverse rotation, and as a result, a centrifugal force acts on the brake shoe 86, and the brake shoe 86 moves. It moves in the radial direction and comes into frictional contact with the brake drum 89. The brake shoe 86, which comes into frictional contact with the brake drum 89, imparts appropriate braking to the rotation of the rope payout / winding drum 6 and prevents the window 131 from being suddenly opened.

While the wire rope 141 is being paid out, the ball chain 96 is pulled to run, and the shaft 3 is rotated via the ball chain wheel 95 to move the arm 11 to the B position.
2 is rotated, the link mechanism 23 connected to the arm 11 is extended as shown in FIG. 2, the pawl link 18 is engaged with the ratchet teeth 16, and the arm 11 is further rotated in the B direction. Comes into contact with the protrusion 12, the rotation of the arm 11 is transmitted to the rotating body 15, and the rotating body 15 is also rotated in the B direction. When the rotating body 15 rotates in the B direction, the gear 42 meshing with the gear 41 integrally formed on the outer periphery of the rotating body 15 rotates, and as a result, the cam disk 46 also rotates.
By the rotation of the cam disk 46, the protrusion 5 caused by the cam groove 44 is formed.
The arm 55 is rotated in the D direction by the guide movement of 2, and the pawl member 57 is meshed with the ratchet teeth 16 as shown in FIG. 4, so that the pawl wheel 17 cannot rotate freely, and is integrally formed with this. The rotated gear 4 also becomes unable to freely rotate, whereby the rotation of the rope payout / winding drum 6 is stopped, and the wire rope 141 from the rope payout / winding drum 6 is stopped. Opening is stopped. In this way, the claw member 57 is the ratchet tooth 1
By pulling the ball chain 96 to the extent that it is meshed with the gear 6, the window 131 can be half-opened to a desired opening. The pawl link 18 meshes with the ratchet teeth 16 to prevent the ratchet wheel 17 from freely rotating. However, by further meshing the pawl member 57 with the ratchet teeth 16, stable free rotation of the ratchet wheel 17 is prevented. Can be made. If the ball chain 96 is pulled so as to rotate the arm 11 in the direction B in the half-opened state of the window 131, as will be described below, the window 1 is also opened from this state.
31 can be closed.

When the window 131 is fully opened, that is, with the arms 11 and 55 shown in FIGS. 3 and 5, the ball chain 96 is pulled to run, and the shaft 3 is rotated through the ball chain wheel 95 to move the arm 11. When rotated in the B direction, the link mechanism 2 connected to the arm 11
3 is extended as shown in FIG. 2, the pawl link 18 is engaged with the ratchet teeth 16, and when the arm 11 is further rotated in the B direction, the pawl members 57 are moved to the ratchet teeth 1 as described above.
Ratchet teeth 1 of the pawl link 18 while being meshed with 6
6, the rotation of the arm 11 in the B direction is transmitted to the ratchet wheel 17, and the rotation of the ratchet wheel 17 in the B direction also rotates the gear 4 in the same direction. As a result, via the gear mechanism 5. The rope feeding / winding drum 6 is rotated in the opposite direction to the above, and the wire rope 141 is wound around the rope feeding / winding drum 6, whereby the window 131 is rotated in the closing direction and finally closed completely. It Even if the traveling of the ball chain 96 is stopped after the window 131 is completely closed, the rope feeding / winding drum 6 can be freely rotated in the feeding direction because the pawl member 57 is meshed with the ratchet teeth 16. Absent. After the pawl member 57 is meshed with the ratchet teeth 16, the projection 52 does not fall into the spiral groove 44a of the cam groove 44, but communicates with the spiral groove 44a to form an endless annular groove 44b formed outside. Therefore, the rotation of the rotating body 15 and the engagement of the claw member 57 with the ratchet teeth 16 are guided by the window 131.
It will be ensured to be completely closed.

The blocking mechanism of the present invention may be constructed as shown in FIGS. 7 and 8. That is, in FIG. 7 and FIG. 8, the blocking mechanism 151 of the present example frictionally holds the rotational position of the arm 11 by the reverse rotation of the shaft 3, that is, the rotation in the B direction, and the ratchet of the ratchet wheel 17 of the ratchet link 18. A friction holding member 152 provided on the rotating body 15 so as to keep meshing with the tooth 16, a ratchet tooth 153 integrally formed on the outer periphery of the rotating body 15, and a ratchet tooth 153.
And a claw member 154 that meshes with. The friction holding member 152 is a spring plate in this example, and this spring plate is a screw 1
Both ends are screwed to the rotating body 15 via 61, and the arm 11 is elastically pressed toward the rotating body 15 at the central portion. The claw member 154 includes a bracket 162 and a shaft 163.
Is rotatably supported by the housing 2 via a shaft 163. One end of the spring 164 wound around the shaft 163 engages with the bracket 162, and the other end engages with the claw member 154.
The claw member 154 is always elastically biased so as to mesh with the ratchet teeth 153.

In the opening / closing device 201 having the blocking mechanism 151 shown in FIGS. 7 and 8, when the arm 11 is rotated in the direction A and brought into contact with the projection 13 by the operation of the ball chain 96, the claw link 18 is formed. Is disengaged from the ratchet teeth 16 to allow the gear 4 to freely rotate, the wire rope 141 is unwound from the rope unwinding / winding drum 6, and the wire 13 is unwound and the window 13
1 will be released. The position of the arm 11 in contact with the protrusion 13 is held by the friction holding member 152. Therefore, when the wire rope 141 is unwound by the operation of the ball chain 96, the arm 11 is once rotated in the A direction and is brought into contact with the protrusion 13. Secured by On the other hand, when the arm 11 is rotated in the B direction and brought into contact with the protrusion 12 by the operation of the ball chain 96, the claw link 18
Meshes with the ratchet tooth 16 and free rotation of the ratchet wheel 17 and the gear 4 is prohibited by the meshing of the ratchet tooth 153 and the claw member 154, and thus the wire rope 141
Feeding is stopped. The position of the arm 11 contacting the protrusion 12 is held by the friction holding member 152, and the half-opened state of the window 131 is maintained. When the ball chain 96 is pulled from the position where it abuts the projection 12 so as to further rotate the arm 11 in the B direction, the ratchet wheel 17 and the gear 4 rotate in the B direction due to the engagement between the pawl link 18 and the ratchet teeth 16. Then, the wire rope 141 is wound around the rope feeding / winding drum 6 and the window 131 is closed.

As described above, the opening / closing operation device 1 of the above specific example
In 201 and 201, the window can be opened and closed by operating the ball chain 96, which is an operating member of one system, and the window 131 can be set to a half-opened state, which can be effectively applied to a ventilation window. In the opening / closing device 201, the spring 101 is omitted.

[0027]

As described above, according to the present invention, the window can be opened and closed by the operating member of one system, and in addition, the opening of the window can be stopped halfway.

[Brief description of drawings]

FIG. 1 is a side sectional view of a preferred embodiment according to the present invention.

FIG. 2 is a partial front cross-sectional view of the specific example shown in FIG.

FIG. 3 is a partially detailed cross-sectional view explaining the rotation of the arm in the specific example shown in FIG.

4 is a partial front sectional view of a portion different from FIG. 2 in the specific example shown in FIG.

5 is a partial detailed cross-sectional view explaining the rotation of the cam disk in the specific example shown in FIG.

FIG. 6 is an explanatory diagram in which the specific example shown in FIG. 1 is applied to a smoke exhaust window.

FIG. 7 is a partial side sectional view of another preferred embodiment according to the present invention.

8 is a partial front sectional view of the specific example shown in FIG. 7. FIG.

[Explanation of symbols]

 1 Window open / close operation device 3 Shaft 4 Gear 5 Gear mechanism 6 Rope feeding / winding drum 7 Clutch mechanism 8 Blocking mechanism

Claims (10)

[Claims] 1. A shaft, a gear rotatably mounted on the shaft, a rope payout / winding drum meshed with the gear, and a shaft for rotation in one direction from a stopped state of the shaft. When the rotation of the shaft is stopped in the other direction, the rotation of the shaft in the other direction is transmitted to the gear by releasing the connection with the gear to allow the gear to freely rotate in the one direction. A window opening / closing device including a clutch mechanism for connecting the shaft and the gear as described above, and a blocking mechanism for blocking the rotation in the one direction of the gear from the rotation in the one direction of the shaft to the opposite rotation. 2. The clutch mechanism includes an arm fixed to a shaft and the arm. The clutch mechanism has two protrusions on the inner peripheral surface, which are spaced from each other and abut against the arm when the arm rotates. A rotatably mounted rotor, a ratchet wheel that has ratchet teeth on the outer periphery and is integrally provided on the gear, and when the shaft rotates in one direction from the stopped state, the ratchet teeth of the ratchet wheel When the shaft is stopped rotating and the shaft rotates in the other direction, it has a pawl link that meshes with the ratchet teeth of the ratchet wheel, and one end is rotated by the rotary body and the other end is rotated by the arm. The opening / closing device for opening and closing a window according to claim 1, further comprising a link mechanism that is movably connected. 3. The blocking mechanism includes a gear integrally formed on the outer periphery of the rotating body, a cam disk meshingly connected to the gear, and having a cam groove on its side surface, and one end of the cam groove formed in the cam groove. The arm is rotatably provided in engagement with the arm, and is rotatably connected to the arm. When the shaft rotates in one direction, the arm is guided in the cam groove to move in one direction. When the ratchet teeth of the ratchet wheel are disengaged, the rotation of the shaft in one direction reverses to the opposite direction,
And a pawl member that meshes with ratchet teeth of the ratchet wheel so as to prevent the ratchet wheel from rotating in one direction when the arm is guided by the cam groove and rotated in the other direction. Item 3. The window opening / closing operation device according to Item 2. 4. The blocking mechanism is adapted to frictionally hold the rotational position of the arm by rotation from one direction of rotation of the shaft to the opposite rotation, and to maintain the engagement of the pawl link with the ratchet teeth of the ratchet wheel. The opening / closing of a window according to claim 2, further comprising: a friction holding member provided on the rotating body, ratchet teeth integrally formed on an outer periphery of the rotating body, and a claw member meshing with the ratchet tooth. Operating device. 5. A link mechanism is such that one end thereof is rotatably connected to a rotating body, one end is rotatably connected to the claw link, and the other end is rotatably connected to an arm. 5. The window opening / closing operation device according to claim 1, further comprising a link. 6. The window opening / closing operation device according to claim 1, wherein a chain wheel is attached to the shaft. 7. The window opening / closing operation device according to claim 1, wherein an output shaft of a motor is connected to the shaft. 8. The window opening / closing operation device according to claim 1, wherein an operation handle is attached to the shaft. 9. The window opening / closing operation device according to claim 1, further comprising a braking device that applies rotational braking to the rope paying-out / winding drum. 10. The braking device includes a brake shoe attached to a rotating shaft having a gear that is meshed with the gear,
The opening / closing operation device for a window according to claim 9, further comprising: a brake drum attached to the rope feeding / winding drum so that an outer peripheral surface of the brake shoe makes frictional contact.