JP5798325B2 - Raising / lowering shoji screen with finger-fighting prevention function and balancer device used therefor - Google Patents

Description

  The present invention relates to a raising / lowering shoji having a finger filling prevention function that prevents a finger or the like from being sandwiched between the shoji and a window frame when the shoji is lowered, and a balancer device used therefor.

  The raising / lowering shoji always acts as a downward force during the fully open, closed and open / close operations, so if the shoji falls suddenly, your hand or fingers will be pinched between the window frame and the shoji. There is a fear. For this reason, a finger padding prevention tool for raising and lowering windows that prevents a finger or the like from being pinched has been proposed (see, for example, Patent Document 1). However, since the apparatus shown in Patent Document 1 is configured to install a finger padding prevention tool on the lower frame of the window frame, it is not preferable because it interferes with the periphery of the window frame. Moreover, although the apparatus which prevented the fall of a shoji was also proposed (for example, refer patent document 2), it is related with the fall prevention when a wire cuts, and is not prevention of a finger pad at the time of raising and lowering a shoji. Therefore, if a finger padding prevention device at the time of raising and lowering the shoji is added, the structure of the balancer device and the window frame must be changed, so the configuration is complicated and cannot be obtained economically.

  Since the weight of the shoji acts as a downward load on the raising / lowering shoji, if the force equivalent to the weight of the shoji always acts upward during opening and closing, the shoji of the shoji will slide The shoji should be able to be raised and lowered only with the operating force that overcomes the sliding resistance generated between the window frames, and even if the shoji is stopped at any opening position, the shoji is stopped at that position by the above sliding resistance. Should be able to maintain. Based on this idea, a balancer device for balancing with the load of the shoji has been proposed. Yes. However, in recent years, the weight of the raising and lowering shoji has increased significantly due to the increase in the size of the double-layer glass, while the performance of the raising and lowering shovel has greatly reduced the sliding resistance when raising and lowering the shoji, and the performance of the balancer device With the improvement, the operating force of the raising and lowering shoji has become even lighter. For this reason, the lighter operating force increases the risk of injuries by accidentally closing the shoji and pinching your arms, hands, fingers, etc. Yes.

  As described above, the apparatus described in Patent Literature 1 can be used with any balancer device, but an obstacle device must be provided in the lower frame portion of the window frame, and the device described in Patent Literature 2 is used. However, there is no need to install a special device on the lower frame of the window frame, but when the wire of the spiral balancer device is cut, fingers are not caught between the window frame and the lower arm of the shoji. It is not designed to prevent finger jamming during normal closure. Moreover, a device as shown in Patent Document 2 cannot be applied to the spiral rod type balancer device.

JP 2008-303638 A (Claim 1, FIG. 6) JP 2002-242527 A (Claim 1, FIG. 5)

  The problem to be solved by the present invention is that it is not necessary to install a special device such as a finger padding prevention device on the window frame in the raising and lowering shodder as described above, and the operation force is as light as the raising and lowering shoddle having a normal balancer device. It is an object to provide a raising / lowering shoji equipped with a finger padding prevention function and a balancer device used therefor that can prevent finger padding even when the shoji door can be closed carelessly.

  According to the present invention, the shoji of the shoji is slidably fitted into the shovel of the window frame, and one end is connected to the window frame between the window frame and the shoji and the other end is connected to the shoji and is raised and lowered. A raising / lowering shoji that is provided with a balancer device that generates an upward force to balance the downward load of the shoji. The balancer device is provided on a cylindrical case and rotatably on the tip side of the case. A cylindrical rotation guide having a slit-like threaded portion, a spiral rod having a spiral portion that is threadedly engaged with the threaded portion of the rotation guide and provided so as to be able to be pulled out from the case; and A torsion coil spring having one end fixed to the base end of the case and the other end connected to the rotating guide; and the spiral rod lead of the spiral rod is in a fully open state of the shoji The lead of the spiral part at the position where the shoji descends to the finger-filling prevention position where the finger-filling prevention gap exists between the lower arm of the shoji and the lower frame of the window frame is gradually increased toward the closed state. Form the lead with the same or fewer leads as the spiral part in front of the position corresponding to the padding prevention position, and increase the upward force by the balancer device at the finger padding prevention position to brake the lowering of the shoji. A raising / lowering shoji having a finger tightness prevention function characterized by the above is provided, and the above problem is solved.

  According to the present invention, the lead Ln of the spiral portion of the spiral rod has a tolerance d from the fully open lead L1 to the lead Lx-1 before the finger padding prevention position from the fully open state to the closed state of the shoji. The lead Lx of the spiral portion at the finger padding prevention position X following the lead Lx-1 is preferably greater than the lead Lx-1 of the spiral portion before the finger padding prevention position. There is provided a raising / lowering shoji having the above-mentioned finger padding prevention function which is a lead of Lx = Lx-1 × (0.6 to 1.0).

  The present invention is constructed as described above, and a shoji screen is slidably fitted into the frame frame of the window frame, and one end is connected to the window frame and the other end is connected to the screen frame between the window frame and the shoji and is raised and lowered. A lifting / lowering shoji provided with a balancer device that generates an upward force against the shoji so as to balance the downward load by the shoji. The balancer device has a cylindrical case and a tip side of the case. A cylindrical rotation guide that is rotatably provided and has a slit-like screw portion; a spiral rod that has a spiral portion that is threadedly engaged with the screw portion of the rotation guide and that can be pulled out from the case; A torsion coil spring fitted to the outer periphery of the spiral rod and having one end fixed to the base end of the case and the other end connected to the rotation guide; and the lead of the spiral portion of the spiral rod is The lead of the spiral part at the position where the shoji descends to the finger padding prevention position where there is a finger padding prevention gap between the lower arm of the shoji and the lower frame of the window frame, gradually increasing from the fully open state to the closed state of the child Is formed in a lead that is the same as or less than the lead of the spiral portion in front of the position corresponding to the finger padding prevention position, and the upward force by the balancer device is made larger than before in the finger padding prevention position to lower the shoji. When the shoji descends to the finger padding prevention position, the upward force by the balancer that had been balanced with the shoji load suddenly increased suddenly, and the shoji descending temporarily stopped until it stopped once. Brake is applied, and a finger padding prevention gap is formed between the lower frame of the window frame and the lower arm of the shoji to prevent finger padding.

  Further, the lead of the spiral portion of the spiral rod is increased in an arithmetic progression from the fully open state of the shoji to the closed state with a tolerance d from the fully open lead L1 to Lx−1, and the lead Lx−1. The lead Lx of the spiral portion at the finger filling prevention position subsequent to the lead Lx-1 of the spiral portion before the finger filling prevention position is preferably Lx = Lx-1 × (0.6 to 1.0). If it is formed on the lead, the braking force for preventing finger jamming will be too small and the shoji will be closed without feeling braking during the operation to lower the shoji, or the braking force will be too great to prevent finger jamming. The shoji that temporarily stopped descending for confirmation jumps up, or the operation force to completely close the shoji from the finger padding prevention position becomes extremely heavy, making it difficult to operate There is no fear, can this be operated comfortably.

The front view of the state which opened the shoji fully. The front view of the state which lowered the shoji to the finger padding prevention position. The partial omission sectional view of a balancer. Explanatory drawing of a spiral rod.

  FIG. 1 shows an embodiment of the raising and lowering shoji of the present invention, the shoji 1 is fitted in the window frame 2, and the eaves 3 slide up and down using the eaves frame 4 of the window frame 2 as a guide, The closed position is a state in which the lower frame 6 of the shoji 1 is in contact with the lower frame 5 of the window frame 2 from the fully opened state shown in FIG. A balancer device 7 is provided between the window frame and the shoji so as to give an upward force to the shoji being raised and lowered.

  As shown in FIG. 3, the balancer device 7 has a cylindrical case 8 attached at one end with a pin 9 or the like, and has a slit-like screw portion 10 on the tip side in the case 8. A rotation guide 11 formed in a cylindrical shape is rotatably provided. A spiral rod 13 having a spiral portion 12 that is threadedly engaged with the screw portion 10 of the rotation guide is provided inside the rotation guide. The spiral rod 13 is provided so as to be able to be pulled out from the case 8. A retaining pin 14 is provided at the inner end, and a mounting pin 16 is provided at the tip, and a spiral portion is usually formed by twisting a flat plate made of a metal material. In addition, a torsion coil spring 15 having one end fixed to the base end portion (case fixing side) of the case 8 and the other end connected to the rotation guide 11 is fitted on the outer periphery of the spiral rod 13. Yes.

  In FIG. 1, the balancer device 7 fixes the base end of the case 8 above the window frame 2 and connects the tip of the spiral rod 13 to the lower heel 6 side of the shoji 1 via a mounting pin or an appropriate bracket. However, the base end of the case 8 may be connected to the shoji 1 side and the tip of the spiral rod 13 may be connected to the window frame 2 side. When the shoji 1 is raised and lowered by this configuration, the spiral rod 13 is pulled out from the case 8 or pushed back into the case, and accordingly the torsion coil spring 15 is wound or unwound via the rotation guide 11. Therefore, an upward force corresponding to the rotation angle of the rotation guide, that is, the amount of winding of the torsion coil spring 15 acts on the shoji 1 via the rotation guide 11. The rotation angle of the rotation guide when the spiral rod moves in the axial direction of the rod changes depending on the lead length of the spiral portion even if the spiral rod moves in the same axial direction. The upward force by the balancer device is small because the rotation angle is small when the lead of the spiral portion is large, and the rotation angle is large and the upward force is large when the lead is small.

  The spiral portion of the spiral rod is basically formed as follows so that the lead gradually increases from the fully open state of the shoji to the closed state. First, when the shoji is in the fully open position, the spiral rod has not yet been pulled out, but in this position, an upward force is required to balance the weight of the shoji so that the shoji does not fall under its own weight. Is set in a pre-wound state to give a predetermined torque. Therefore, the lead L1 when the shoji is in the fully open state is formed on the lead L1 for rotating the rotation guide to such an extent that a necessary upward force can be applied in cooperation with the torsion coil spring that is wound in advance. . In addition, because the frictional action between the shoji 3 and the window frame 4 has a frictional force that acts as a sliding resistance when the hoist is raised and lowered, this force also holds the shoji in the stop position. It is considered as a maintenance force.

  Next, when the shoji is started to be lowered (closed) from the fully open state, the spiral rod is pulled out through the threaded portion of the rotating guide, and the rotating guide rotates according to the pulling length of the spiral portion. The torsion coil spring is added. At this time, if the lead of this portion is the same as the first lead L1, inconvenience occurs. That is, if the lead of the spiral part is the same, the weight of the shoji and the upward force by the balancer device are balanced in the fully open state of the shoji, so when the spiral rod is further pulled and the rotation guide rotates, the torsion coil spring is further wound Therefore, the upward force due to the balancer device is larger than the downward force due to the weight of the shoji, and the shoji jumps upward. To keep the upward force from the balancer device almost equal to the downward force of the shoji at the position where the shoji has moved so as not to cause such jumping, gradually adjust the lead of the spiral part so that the upward force by the balancer device gradually decreases. The upward force generated by the balancer device may be made substantially equal to the downward force generated by the weight of the shoji.

In order to gradually increase the lead as described above, it is possible to increase the lead at an appropriate ratio. However, in the embodiment, the lead of the spiral portion is changed so as to gradually increase in an arithmetic progression with tolerance d. is there. Specifically, the lead Ln of the nth spiral portion is L1 <L2 <L3 <.
Ln = L1 + (n−1) × d (1) The lead value obtained by the equation (1) is used. At this time, the first lead L1 and tolerance d vary depending on the size, weight, structure, place of use, torsion coil spring of the balancer device, spiral rod, case, and other conditions. For example, L1 = about 30 to 115 mm. D = about 3 to 20 in many cases. In this way, by enlarging the leads in an arithmetic progression, the spiral rod is pulled out, and the torsion coil spring is added by the angle that the rotation guide is rotated by the lead of the spiral part, but the lead of the spiral part gradually increases. Thus, the shoji does not jump up, and the downward force due to the weight of the shoji and the upward force due to the balancer device are substantially the same, and can be raised and lowered (opened and closed) with a light operating force.

When the above-mentioned shoji 1 descends and comes to the finger padding prevention position X before the closing where the finger padding prevention gap S exists between the lower arm 6 of the shoji 1 and the lower frame 5 of the window frame 2, the spiral portion corresponding to this part The lead Lx is not a lead that has been changed so as to gradually reduce the upward force as determined by the above formula (1). In this portion of the lead Lx, the upward force by the balancer device 7 is the same as or larger than the upward force before that so that the braking force to the extent that the movement of the shoji 1 is temporarily stopped at the finger-filling prevention position X acts on the shoji. It is supposed to be. That is, the lead Lx at the finger filling prevention position is the same as the lead Lx-1 before the position corresponding to the finger filling prevention position or less than the lead Lx-1 before the position corresponding to the finger filling prevention position. Is formed. In other words, the lead Lx-1 in the foreground is a lead having a length that gradually increases due to the tolerance d obtained by the above formula (1). The lead Lx in this portion following the lead Lx-1 is The tolerance (term difference) dx of the finger pad prevention position is 0 <dx ≦ d with respect to the lead tolerance d of the previous spiral portion.
The lead Lx is determined so that

Further, preferably, the lead Lx at the finger pad prevention position is
Lx≈Lx-1 × (0.6 to 1.0)
It is good to set so that it becomes. If it is less than 0.6, the upward force by the balancer device 7 will be larger than the downward force due to the weight of the shoji, and the shoji that has been temporarily stopped to prevent fingering will jump up, and then the shoji will be closed. Operating force when closing is increased. On the other hand, if it is larger than 1.0, the braking force for preventing finger jamming is reduced, and the operating force to lower the shoji does not act at the position where the braking should be applied, and the shoji descends to the closed position. The goal cannot be achieved. The finger padding prevention position X can be appropriately determined depending on the place of use and purpose of use, but may be set, for example, at a position about 50 mm above the lower frame 5 of the window frame 2.

The spiral lead Lz from the finger padding prevention position to the fully closed position needs to be able to close the shoji, which has been braked as described above, with a light operating force before the shoji is closed. Therefore, the downward force due to the weight of the shoji and the upward force due to the balancer device are made larger than the lead Lx-1 before the finger padding prevention position so that the upward force is almost equal. This is because if the lead Lz is not made larger than the lead Lx-1, the downward force due to the shoji and the upward force due to the balancer device will not be substantially equal. The lead Lz at this time may be the lead obtained by the above formula (1), but preferably Lz≈Lx-1 × (1.2 or more)
It is good to do.
If it is 1.2 or less, the upward force by the balancer device will be larger than the downward force due to the weight of the shoji, the shoji will jump up, and the shoji will stop when the shoji is stopped between the finger padding prevention position and the closed position. It is because it will not be able to be maintained and will jump up.

  With the above configuration, when the shoji is moved from the fully open state toward the closed position, the downward force due to the weight of the shoji and the upward force by the balancer device are almost equal to the finger padding prevention position X. It becomes lighter and the shoji can be stopped and held at an arbitrary stop position. When the finger-filling prevention position X is lowered, the upward force by the balancer device becomes larger than the downward force due to the weight of the shoji, so that the movement of the shoji can be temporarily stopped, and the finger-tightening gap is placed below the window frame. S is formed so that hands, fingers and the like are not caught. Furthermore, when lowering from this stop position, the reed is enlarged and the upward force due to the balancer device and the downward force due to the weight of the shoji are almost equal, so the shoji can be raised and lowered with a light operating force.

  When opening the shoji, since the upward force by the balancer device and the weight of the shoji are almost equal from the closed position to the finger padding prevention position X, the shoji can be raised with a light operating force. When reaching the finger padding prevention position X, the upward force by the balancer device becomes larger than the weight of the shoji, so the shoji can be raised with an extremely light force. Further, when the finger filling prevention position X is passed, the upward force by the balancer device and the weight of the shoji are almost equal, so that the shoji can be raised with a light operating force as usual.

The above embodiment is a case where the weight of the shoji is normal, but if the weight of the shoji is relatively light, there is a possibility that the shoji 1 jumps up when braking suddenly at the finger padding prevention position X. Therefore, from the position before the finger padding prevention position X, specifically, the position of the finger padding prevention gap S + several tens of millimeters, the downward force due to the weight of the shoji screen is made larger than the upward force by the balancer device, so that the shoji paper jumps up. It should be possible to prevent this. That is, the lead Lx-1 at the finger padding prevention position + several tens of millimeters is made larger than the tolerance d of the front lead Lx-2 obtained by the above formula (1) as the tolerance d.
Lx-1 ≒ = Lx-2x (1.2 or more)
It is preferable to determine so that.
If it is 1.2 or less, the upward force by the balancer device will be larger than the downward force due to the weight of the shoji, the shoji will jump up and the shoji will remain in the stop position when the shoji is stopped in front of the finger padding prevention position. It is because it jumps up without being able to do it.

Further, in the case of a relatively lightweight shoji as described above, the lead Lx for braking the shoji by increasing the upward force by the balancer device 7 at the finger padding prevention position X is smaller than the lead Lx-2. And preferably Lx≈Lx−2 × (0.6 to 1.0)
You can do it. Due to such changes in the lead, the upward force by the balancer device becomes larger than the downward force due to the weight of the shoji, and when closing the shoji, a large braking force is applied at the finger padding prevention position X, and the state is close to stopping. Thus, it is possible to exert a finger filling prevention function.

And in the case of such a relatively lightweight shoji, the lead Lz from the finger padding prevention position X to the closed position is confirmed to be safe at the finger padding prevention position for the shoji, so the downward force and the balancer device The upward force should be made almost equal so that the shoji raising / lowering operation force becomes light. Therefore, unless the lead Lz of this part is larger than the lead Lx-2, the downward force due to the shoji and the upward force due to the balancer device are not substantially equal. That is, the lead Lz may be the lead obtained by the above formula (1), but preferably Lz≈Lx−2 × (1.2 or more)
It is good to do. If it is 1.2 or less, the upward force by the balancer device will be larger than the downward force due to the weight of the shoji, the shoji will jump up, and the shoji will stop when the shoji is stopped between the finger padding prevention position and the closed position. It is because it cannot be maintained and it jumps up.

  With the above configuration, in the case of a relatively lightweight shoji, when the shoji is moved from the fully open state toward the closed position, the downward force due to the weight of the shoji and the balancer device are reduced to the position of the finger padding prevention position X + several tens of mm. The upward force due to is almost the same, and the operating force is reduced, and the shoji can be stopped and held at an arbitrary stop position. When the finger-filling prevention position X is lowered to the position of several tens of millimeters, the downward force due to the weight of the shoji becomes larger than the upward force due to the balancer device, so that the shoji is momentarily lowered (drooping), but immediately. When the finger padding prevention position X is reached, the upward force by the balancer device becomes larger than the downward force due to the weight of the shoji, and the movement of the shoji can be temporarily stopped. Therefore, even if the movement of the shoji is suddenly stopped at the temporary stop position, the shoji does not jump up and can be stopped in a stable state. In this way, the finger filling prevention gap S is formed below the window frame, so that hands, fingers and the like can be prevented from being caught. Furthermore, when lowering from this stop position, the lead Lz is larger than the lead Lx-2, and the upward force due to the balancer device and the downward force due to the weight of the shoji are almost equal, so the shoji can be operated with a light operating force. it can.

  When opening the shoji, the upward force by the balancer device and the downward force due to the weight of the shoji are almost equal up to the finger padding prevention position X. Therefore, the shoji can be raised with a light operating force. When reaching the finger-filling prevention position X, the shoji behaves as if the shoji is raised without an operation force that is raised momentarily, but immediately reaches the finger-filling prevention position X + several tens of millimeters, and the shoji stops. That is, during this time, the downward force due to the weight of the shoji is made larger than the upward force due to the balancer device, so that the operation force for raising the shoji for a moment is increased. After this position, the upward force by the balancer device and the weight of the shoji are almost equal, so the shoji can be raised with a light operating force.

In addition, the shoji closed as described above may be difficult to lift when the shoji is opened by contacting the lower frame of the window frame and adhering to the packing for heat insulation and watertightness in the closed position. In order to prevent such a fear, the upward force by the balancer device is made larger than the downward force due to the weight of the shoji at the closed position so that the shoji can be lifted lightly when pulling up. Therefore, in such a case, the lead z when stopped at the closed position is approximately the same as the lead Lx at the finger padding prevention position, preferably Lz≈Lx−1 × (1.0 to 1.5) (normal In case of shoji) or Lz ≒ Lx-2 x (1.0-1.5) (in case of relatively light shoji)
And it is sufficient.
When the value is 1.0 or less, the upward force by the balancer device is significantly higher than the downward force by the weight of the shoji, so the assist effect is great, but even if the shoji is closed, it will jump up or operate to close the shoji Will become bigger. On the other hand, if the ratio is larger than 1.5, the upward force due to the balancer device does not become larger than the downward force due to the weight of the shoji and the assist effect is lost.

  As described above, since the lead of the spiral portion of the spiral rod of the balancer device is made smaller than the lead in front of the finger padding prevention position X, when the shoji is lowered, it is temporarily stopped at the finger padding prevention position X. A certain amount of braking force can be applied to the shoji, and the finger padding prevention position X can be confirmed, which is safe.

DESCRIPTION OF SYMBOLS 1 Shoji 2 Window frame 7 Balancer device 8 Case 11 Rotation guide 12 Spiral part 13 Spiral rod 15 Torsion coil spring S Finger filling prevention gap X Finger filling prevention position

Claims (4)

  The sliding frame is slidably fitted into the frame of the window frame, one end is connected to the window frame between the window frame and the sliding frame, and the other end is connected to the sliding frame to generate upward force. A lifting and lowering shoji provided with a balancer device to balance with the downward load by the shoji, the balancer device comprising a cylindrical case and a slit-like threaded portion rotatably provided on the tip side of the case A cylindrical rotation guide having a spiral portion that is threadably engaged with the screw portion of the rotation guide and is provided so as to be able to be pulled out from the case; and one end fitted into the outer periphery of the spiral rod Is fixed to the base end of the case and the other end is connected to the rotation guide, and the spiral lead of the spiral rod is directed from the fully open state of the shoji to the closed state. The lead of the spiral portion at the position where the shoji descends to the finger padding prevention position where the finger padding prevention gap exists between the lower arm of the shoji and the lower frame of the window frame is moved to the finger padding prevention position. Spiral of the spiral rod is formed on the lead that is the same or less than the lead of the spiral part in front of the corresponding position, and the upward force by the balancer device is increased more than before in the finger padding prevention position to brake the lowering of the shoji. From the fully open state of the shoji to the closed state, the lead of the part increases in an arithmetic sequence with tolerance d from the lead L1 to Lx-1 of the spiral part in the fully open state. The lead Lx of the spiral portion at the prevention position X is formed as a lead of Lx = Lx−1 × (0.6 to 1.0) with respect to the lead Lx−1 of the spiral portion before the finger filling prevention position. The lead Lz from the finger padding prevention position X until the shoji is closed is formed as a lead of Lz = Lx-1 × (1.0 to 1.5) so as to assist the upward force. Raising and lowering shoji with anti-fingering function. The sliding frame is slidably fitted into the frame of the window frame, one end is connected to the window frame between the window frame and the sliding frame, and the other end is connected to the sliding frame to generate upward force. A lifting and lowering shoji provided with a balancer device to balance with the downward load by the shoji, the balancer device comprising a cylindrical case and a slit-like threaded portion rotatably provided on the tip side of the case A cylindrical rotation guide having a spiral portion that is threadably engaged with the screw portion of the rotation guide and is provided so as to be able to be pulled out from the case; and one end fitted into the outer periphery of the spiral rod Is fixed to the base end of the case and the other end is connected to the rotation guide, and the spiral lead of the spiral rod is directed from the fully open state of the shoji to the closed state. Gradually increase the upward force by the balancer device at the position where the shoji descends to the finger padding prevention position where the finger padding prevention gap exists between the lower arm of the shoji and the lower frame of the window frame. The lead of the spiral part of the spiral rod is an equidistant sequence with a tolerance d from the lead L1 to Lx-2 of the spiral part in the fully open state from the fully open state to the closed state so as to brake the descent of the shoji. The lead Lx-1 of the spiral portion before the finger padding prevention position X following the lead Lx-2 is larger than the tolerance d of the Lx-2, and the lead Lx of the finger padding prevention position X is The lead Lz is formed as a lead of Lx = Lx-2 × (0.6 to 1.0) with respect to the lead Lx-2, and the lead Lz from the finger padding prevention position X until the shoji is closed assists the upward force. To do A raising / lowering shoji having a finger filling prevention function formed on a lead of Lz = Lx−2 × (1.0 to 1.5) .   A balancer device in which an upward force is applied to a shoji that can be raised and lowered with respect to a window frame so as to balance the downward weight of the shoji, the balancer device comprising a cylindrical case, A cylindrical rotation guide that is provided on the distal end side so as to be rotatable and has a slit-like screw portion, and a spiral portion that has a spiral portion that penetrates the screw portion of the rotation guide in a screwed state and that can be pulled out from the case. A rod and a torsion coil spring that is fitted on the outer periphery of the spiral rod and has one end fixed to the base end portion of the case and the other end connected to the rotation guide, and the lead of the spiral portion of the spiral rod is a shoji Gradually increased from the fully open state to the closed state, the shoji descended to the finger padding prevention position where the finger padding prevention gap exists between the lower arm of the shoji and the lower frame of the window frame. The lead of the spiral part at the position is formed to be the same or less than the lead of the spiral part in front of the position corresponding to the finger padding prevention position, and the upward force by the balancer device at the finger padding prevention position is higher than before The lead of the spiral portion of the spiral rod is increased from the fully open state to the closed state of the shoji so that the descent of the shoji is lowered, so that the tolerance d is the tolerance d from the lead L1 to Lx-1 of the fully open spiral portion. The lead Lx of the spiral portion at the finger padding prevention position X following the lead Lx-1 increases in a number sequence, and the lead Lx-1 of the spiral portion before the finger padding prevention position is Lx = Lx-1 × ( 0.6 to 1.0), and the lead Lz from the finger padding prevention position X until the shoji is closed is Lz = Lx−1 so as to assist the upward force. A balancer device for raising and lowering shoji, which is formed on a lead of x (1.0 to 1.5). A balancer device in which an upward force is applied to a shoji that can be raised and lowered with respect to a window frame so as to balance the downward weight of the shoji, the balancer device comprising a cylindrical case, A cylindrical rotation guide that is provided on the distal end side so as to be rotatable and has a slit-like screw portion, and a spiral portion that has a spiral portion that penetrates the screw portion of the rotation guide in a screwed state and that can be pulled out from the case A rod and a torsion coil spring that is fitted on the outer periphery of the spiral rod and has one end fixed to the base end portion of the case and the other end connected to the rotation guide, and the lead of the spiral portion of the spiral rod is a shoji Gradually increased from the fully open state to the closed state, the shoji descended to the finger padding prevention position where the finger padding prevention gap exists between the lower arm of the shoji and the lower frame of the window frame. The lead of the spiral part of the spiral rod to an upward force by the balancer apparatus location is made larger than before that to brake the descent of the sliding door towards the closed state from the fully opened state of the sliding door, the lead of the spiral portion of the fully opened state The lead Lx-1 of the spiral portion immediately before the finger padding prevention position X following the lead Lx-2 is increased in the form of an arithmetic progression having a tolerance d from L1 to Lx-2. The tolerance d of the Lx-2 The lead Lx at the finger filling prevention position X is formed as a lead of Lx = Lx−2 × (0.6 to 1.0) with respect to the lead Lx−2 , and the finger filling prevention position X is The lead Lz from the start to the closing of the shoji is a balancer device for raising and lowering shoji formed on the lead of Lz = Lx−2 × (1.0 to 1.5) so as to assist the upward force .

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