JP3787136B2 - Braking device for sliding door - Google Patents

Description

  The present invention relates to a sliding door braking device.

  In general, sliding doors consisting of doors and frames have rails at the upper and lower positions of the frame, and a door is provided at the lower part of the door, and rails and doors are placed only at the upper part of the frame. There is a type that hangs from the frame, and in either case, the door body is moved in the left-right direction with respect to the sliding door surface to open and close. Compared to a door that is opened and closed by a rotation operation while holding the door with a hinge or the like, the sliding door is less likely to interfere with the position of the person who operates the door, and the dead space is like a door. This is also expected to be excellent in wheelchair traffic, and is expected to increase in terms of barrier-free.

  However, the sliding door is an operation that moves the door in the left-right direction, and it cannot be pushed and pulled with its own weight like the door, but it must be opened and closed only with the force of the arm. It is the most important point that it can be operated with. Therefore, nowadays, improvements are made on a daily basis so that the running performance of the door cart is improved and it can be operated smoothly even with a small force. However, the lighter the opening / closing operation, the more the speed is applied when the door is closed vigorously, and the door tip surface and the inner surface of the frame collide strongly, generating a large impact sound and causing the door to rebound. Occur. Then it is necessary to close the door again, which is very inconvenient when you are in a hurry, etc., and it is troublesome to close it again, so even if it bounces a little, it tends to be left as it is. There is also a risk of impairing light shielding properties. In addition, there is a risk that once the door is closed strongly, only the door will run ahead and the child will stuff his fingers when passing.

  Moreover, it is conceivable that the door bottom side collides with the frame when it is opened very strongly not only when the door is closed but also when the door is opened. This operation also generates a loud collision sound and impact, and this time the door body will bounce back in the closing direction, so the door tip may hit the person who is passing, so recently it can be braked in the opening direction as well. It has been desired to do so.

  Assuming an ideal sliding door opening / closing operation, the closing operation is always decelerated to a very slow speed one step before the complete closing regardless of the closing speed of the door body, and then it closes slowly and completely. Is ideal. If this operation can be realized, no impact or collision sound due to the collision with the frame body will be generated, and naturally rebounding can be prevented. It is also important that when opening, no load is applied for deceleration, and that it can be opened with a light force. Furthermore, even if the door stops at a position that is not completely closed due to the deceleration operation at the time of closing, the load for deceleration by the braking device is released at this stage, and a light operation is performed when only the remaining open part is closed again It is desirable that it can be implemented in

  As means for solving the above problems, JP 07-139241 A, JP 09-072154 A, JP 09-317318 A, JP 11-148269 A, JP 2001-012139 A, JP 2001-182426 A, and the like. In the gazette, etc., by applying a load by friction or a pressing force by a spring immediately before the door is closed, or by applying a load by using a simple damper using highly viscous oil, the door closing speed is reduced. A configuration that prevents collision noise and bounce is reported.

  Here, in each of the above-mentioned publications, most of them adopt a method of applying a load to the running of the door body by a frictional force or a pressing force by a spring from a predetermined position at the time of closing, that is, a configuration that decelerates by a certain amount at the time of closing. It has become. Some have a mechanism to adjust the overall deceleration amount, but no means is provided to change the deceleration amount depending on the closing speed, so the set deceleration amount If the speed is higher, the motor will bounce off without being able to decelerate, and if the speed is lower than the set deceleration amount, it will stop in the middle of deceleration and will not close completely.

  In addition, if the deceleration amount is too large than the door speed and it stops in the middle, it is naturally necessary to close the remaining open part again, but in this stopped state, the load for deceleration is reduced. There are many things that remain in the applied state, and therefore, the operation when closing the remaining open part again becomes very heavy.

  In the opening operation, a mechanism in which friction is generated only in the closing direction as in JP-A-09-317318, and no load is applied in the reverse direction, which is the opening direction, and the mechanism is free. It has been reported that combines. However, in other configurations, a part of the load required during deceleration remains in the operation in the opening direction, and most of the opening operation becomes slightly heavy.

  In addition to these, there is a hydraulic rotary damper used in self-closing sliding door closers such as entrance sliding doors, and the mechanism brakes only in the closing direction in conjunction with the rotation of the gear and is free in the opening direction. It has the structure which becomes. The braking means of the rotary damper is configured such that oil moves through two separated chambers through an orifice, and can cope with the strength of the closing speed. In addition, it is equipped with a mechanism that restricts the rotation direction to only one side so that only the gears idle in the opening direction. Therefore, it is considered that the above requirements are almost satisfied. However, this type of braking device has a problem that the mechanism is inevitably complicated as described above, and the size is large and very expensive.

  Therefore, the present inventor disclosed in Japanese Patent Application Laid-Open No. 2003-307073 by using a plurality of pendulum-shaped rotating members and using the weight balance on both sides of the rotating member with the rotating shaft as a boundary, so that the speed is not reduced at an extremely low speed. When the speed is higher than that, a deceleration amount approximately proportional to the speed of the door body is obtained, and it is set so as not to stop as much as possible during closing, and a configuration in which the operation does not become heavy even when opened is presented.

  However, Japanese Patent Application Laid-Open No. 2003-307073 uses a plurality of rotating members utilizing weight balance, and a load is generated when the plurality of rotating members are sequentially engaged with the speed reducing member, thereby decelerating the door body. That is, the entire deceleration amount can be made substantially proportional to the speed of the door body by changing the number of rotating members engaged with the speed reduction member according to the speed of the door body. As a result, the overall deceleration amount inevitably becomes stepwise, and if an attempt is made to change the overall deceleration amount with a finer setting, a very large number of rotating members are required. Therefore, there is a concern that as the number of rotating members increases, the cost of the rotating device itself increases and the assembling becomes complicated, and further, the overall size increases, and the overall cost becomes high.

  In addition, the amount of deceleration by one rotating member and the conditions for engagement between the rotating member and the speed reducer are appropriately set so that the door is completely closed without stopping during deceleration as much as possible. Stops in the middle of deceleration due to variations in the conditions of the door and rail due to differences in the weight of various doors and external factors such as temperature, humidity, and dust. It is thought that it must be assumed. Then, in this case, the load is stopped with the load applied, and the problem that the operation when closing the remaining opening again becomes heavy cannot be solved.

The present invention has been made to solve the above-mentioned problems, and is based on the premise that it can be configured in a relatively simple mechanism and compactly. When closed, it is a stepless deceleration amount proportional to the speed of the door. The object is to obtain a light opening operation without applying any load by the braking device at the time of opening. In the operation at the time of closing, the amount of deceleration changes corresponding to the magnitude of the speed, and the speed is always decelerated once to a predetermined low speed, and the operation is to be completely closed without stopping as it is. However, even if it stops in the middle of deceleration, the load for deceleration is already released when closing the remaining open parts after that, and it is possible to close again with a light operation. . Furthermore, the next object is to add a configuration that can prevent the sound and bounce due to the collision between the door bottom side and the frame when the door is strongly opened.
JP 07-139241 A JP 09-072154 JP 09-317318 A JP 11-148269 A JP 2001-012139 A JP 2001-182426 A JP 2003-307073 A

  In the present invention, the following technical means are provided to solve the above problems. First, a box-shaped main body case, a speed reduction member configured with a gear and a constant load when the gear rotates, and a swinging member with a protruding part are provided, and the swinging member can be rotated within the main body case In this way, the main unit is constructed by assembling with the rotating shaft. At this time, a speed reduction member having a gear is disposed on one side of the rotating shaft of the swinging member, and a protruding portion is disposed on the other side.

  Any mechanism may be used for generating the load by rotating the gear of the speed reduction member, but a plurality of disc spring washers are sandwiched by a washer-like member made of material having excellent wear resistance. In a structure such as a torque hinge that applies a load during rotation using the force and frictional force of the spring, which is assembled to rotate in conjunction with the gear member, and highly viscous silicone oil and blades in the housing A structure such as a rotary damper that applies a load by rotating the blade-like member while pushing away oil when the gear rotates is suitable. When this rotary damper is used, it may be the simplest and cheapest that applies the same load regardless of which direction it is rotated.

  Next, a receiving device having a long receiving shape having a contact member at the end and a continuous rack disposed therein is provided. Then, the main body device and the receiving device are divided into the door body and the frame body, and are mounted so that both face each other at a stage just before the door body is completely closed. The place where the main unit and the receiving device are attached can be built-in type or external type, and the vertical position is not particularly limited, but the main unit and the receiving device are distributed and installed on the upper door side and the upper frame door side. The arrangement | positioning to perform is the most excellent, and a mutual mutual operation | movement by opening and closing of the door body in this arrangement | positioning is demonstrated below.

  First, when the door body is closed from the largely opened state, the contact member of the receiving device comes into contact with the protruding portion of the swinging member and rotates the swinging member at the initial stage where the main body device and the receiving device face each other. The gear engages with the rack by the rotation of the swing member, and a load is applied by the reduction member to reduce the speed of the door. Here, if the door is further moved and the protruding part is detached from the contact part and the door is decelerated to a predetermined speed, a release means for releasing the gear and the rack is provided. The door can be completely closed depending on the speed. Further, even if the vehicle stops in the middle of deceleration, the gear and the rack are separated at that stage, so that when the remaining open portion is closed again, the braking device is not loaded and a light closing operation is possible.

  There are many configurations of the main unit and the receiving device for obtaining the above basic operation and release means. Next, the main four configurations will be described. The first point is that the swinging member is mounted on the main body case so that the rotation direction is parallel to the door body surface, the side surface of the gear is parallel to the door body surface, the rack is continuously arranged upward, and the rotation axis is set. The weight balance between the projecting portion side as a boundary and the gear side including the speed reduction member is set so that the projecting portion side becomes heavier. When the door is moving at a low speed, the abutting member lifts the protruding portion slightly and the gear does not engage the rack, so it does not decelerate, and at a high speed, the abutting member moves to the protruding portion. It is set so that the gear is engaged with the rack and decelerated by instantaneously rotating the swinging member greatly upon collision. Further, the door is stopped or decelerated to a predetermined speed, and the gear is detached from the rack when the force to rotate the swinging member in the direction of returning the weight balance by the friction force generated in the gear and the rack wins. It is configured as follows.

  The second point is that the swinging member is attached to the main body case so that the rotation direction is parallel to the door body surface, the side of the gear is parallel to the door body surface, the rack is continuously placed upward, and the rotation axis is the boundary. The weight balance between the protruding portion side and the gear side including the speed reduction member is distributed so that the protruding portion side is much heavier. Regardless of the speed of the door body, the swinging member is rotated to a certain angle by the contact of the contact member and the protruding part, the gear and the rack are set so that they are always engaged, and the door body moves. When the protruding part comes off the contact part and the door stops or decelerates to a predetermined speed, the force that the swinging member tries to return in a weight balance wins from the frictional force generated in the gear and the rack. The gear is configured to be detached from the rack.

  The third point is that the swinging member is mounted on the main body case so that the rotation direction is parallel to the door body surface, the side surface of the gear is parallel to the door body surface, and the rack is continuously arranged in either the top or bottom direction, The member is mounted on the swinging member so as to urge the member in the direction in which the gear is detached from the rack. Regardless of the speed of the door body, the swinging member is rotated to a certain angle by the contact of the contact member and the protruding part, the gear and the rack are set so that they are always engaged, and the door body moves. Then, the projecting part is disengaged from the abutting part, and the door is stopped or decelerated to a predetermined speed, and the gear disengages from the rack when the biasing force of the spring member wins over the friction force generated in the gear and the rack. It is configured as follows.

  The fourth point is that the swinging member is mounted on the main body case so that the rotation direction is on the horizontal plane, the side of the gear is up and down, the rack is continuously placed sideways, and the spring member is detached from the rack. It is attached to the swinging member so as to be urged in the direction to be moved. In addition, the swinging member is rotated to a certain angle by the abutment of the abutting member and the protruding part regardless of the speed of the door, and the gear and the rack are set so that they are always engaged, and the door is moved further. The protruding part comes off from the contact part, and the door stops or is decelerated to a predetermined speed so that the gear is detached from the rack when the biasing force of the spring member is greater than the friction force generated in the gear and the rack. Configure it to

  In each of the above-described configurations, the basic deceleration operation and the release means have almost the same role. In other words, when the door is wide open, the protruding portion is in a protruding state, and the contact member protrudes at the earliest stage when the main body device and the receiving device face each other when the door is moved in the closing direction. The swinging member is rotated in contact with the gear, and the gear and the rack are engaged with each other so that a load is applied by the speed reducing member, and the speed of the door body is reduced. Further, when the door moves further in the closing direction only by a small distance while decelerating, the protruding portion is detached from the abutting member, and thereafter the gear is subjected to a force to be detached from the rack by each releasing means. However, in this engaged state, a frictional force for deceleration acts on the gear and the rack, and this frictional force increases as the speed of the door increases, and decreases as the speed decreases. Therefore, when the speed of the door is still high, the gear is not detached from the rack due to the frictional force of the gear and the rack, and the speed of the door is decreased and the frictional force between the gear and the rack becomes smaller than the force by the releasing means. The gear and the rack are detached and the deceleration operation is finished.

  By arbitrarily setting the conditions for separating the gear and the rack, it is possible to obtain an operation in which the door is once decelerated to a relatively slow predetermined speed and then gently closed as it is. In other words, when the door speed is very fast, the distance between the gear and the rack becomes longer, and the overall deceleration amount increases accordingly. Conversely, when the door speed is slow, the distance between the gear and the rack meshes. This is because the overall deceleration amount is reduced. Therefore, a decelerating amount corresponding to the speed can be obtained under any closing condition, and a very excellent door closing operation can be realized.

  However, in order to prevent even a slight collision noise when the door is closed and even a rebound of a very small distance, the condition when the gear and the rack are separated is changed to a state where the speed of the door after the separation is extremely slow. Need to set. Here, the friction condition between the gear and the rack may vary depending on the climate, the room temperature, and the surrounding environment. Therefore, if the setting is made as described above, it is assumed that the door may stop during deceleration. However, the important point here is that even if the door stops in the middle of deceleration, the friction force surely disappears at that stage, that is, the gear is detached from the rack at the moment of stopping, When the remaining open part is closed again, it can be carried out with a light operation.

  Further, in the opening operation from the state in which the door is completely closed, the gear and the rack are surely detached, and therefore the opening operation can be performed with a light operation. Here, when the contact member is slightly opened, the contact member contacts the projecting portion and the swinging member rotates, and the gear tries to engage with the rack. This is the position of the end of the door butt after passing through, and since the subsequent moving direction is the direction away from the rack, the deceleration operation is not performed. When the door is further opened, the gear returns to the release position again and is held as it is.

  In order to stop in the fully closed state without stopping during the closing movement after decelerating or after the deceleration operation is released, the predetermined speed at which the rack and gears are separated is set relatively high. In addition, a means for holding the door in a completely closed state may be added to prevent rebound. This closed state holding means is sufficient to barely prevent the door body from bouncing off due to the relatively slow speed remaining after being decelerated to a predetermined speed, and a structure in which the holding roller is fitted to a leaf spring of extremely weak force, or a magnet The configuration for sorting and mounting the catch and steel plate is inexpensive and simple. When this closed state holding means is used in combination, it is possible to prevent malfunctions such as the door opening without permission from the closed state due to the inclination or vibration of the rail. Moreover, the structure which provided the sickle lock etc. which are locked simultaneously with closure of a door body may be sufficient.

  Furthermore, if a closing device that always pulls in the closing direction from the opened state of the door is also provided, it can be developed as a braking device with an automatic closing mechanism. That is, the door operation is the same in both the closed state by the human hand and the closed state by the closing device, and the same braking operation as described above can be obtained. Therefore, the closing device may be a device that simply pulls the door, a configuration in which a weight that has been used in the past is suspended and closed by the weight of the weight, a configuration in which the mainspring is closed with a wire wire, a cup The structure which closes using a ring spring, the structure which inclines the rail itself and closes with the dead weight of a door body, etc. are simple.

  When the above closure device is used in combination, the door will naturally close when the hand is released after release, and the subsequent deceleration operation and the release operation in which the gear and the rack are released after being decelerated to a predetermined speed It will be the same. However, since the door is pulled by the closing device even at the stage of release, the door can be closed as it is without stopping at the middle position. Therefore, the setting of the predetermined speed at which the deceleration operation is released may be a setting to decelerate until it becomes extremely slow, and the gear and the rack are detached in a state of almost stopping, and then the configuration is gradually closed only with the force of the closing device. Is excellent. Further, when the closing device is used in combination, the holding means in the closed state is not necessary.

  In addition, with respect to the collision and rebounding with the frame on the door butt side at the time of opening, in addition to the above configuration, the other receiving device or main body device is symmetric with respect to the upper frame or door body. It is preferable that the contact member and the protruding portion are in contact with each other at a position slightly above the fully opened position so that the swinging member rotates and the gear and the rack engage with each other. Of course, the same result can be obtained even if the above-mentioned main body device and the receiving device are arranged on the other side of the door, but in this configuration, only one of the main body device or the receiving device is added, The other can be combined.

  Since the door is decelerated by applying a load by engaging the gear and the rack interlocked with the speed reducing member, and the gear member and the rack are released at the stage of decelerating to a predetermined speed, the speed of the door is added. A stepless amount of deceleration proportional to the magnitude of the angle is obtained, and once the speed is reduced to an extremely low speed, the operation can be slowly and completely closed. As a result, the door can be opened and closed without a strong collision or rebound with the frame body under closed conditions at any speed.

  Even if the door stops while it is decelerating or closing at a low speed after the deceleration operation is completed, the gear and the rack must be detached at that stage to release the load for deceleration. When the remaining open part is closed again, it can be carried out with a light operation. Further, when the door is completely closed, the gear and the rack are surely detached, and therefore the opening operation can always be performed with a light operation.

  In order to ensure that the door body travels to the closed position after deceleration, the predetermined speed at which the gears and the rack are separated from each other is set relatively fast, and the holding roller is attached to the leaf spring with extremely weak force in the fully closed state. By adding holding means such as a fitting configuration, it is possible to prevent the door body from bouncing off due to the remaining slow speed after being decelerated to a predetermined speed, and to stop more reliably in a completely closed state. Become. By using this closed state holding means in combination, it is possible to simultaneously prevent malfunctions such as the door opening from the closed state without permission due to the inclination or vibration of the rail.

  Further, if a closing device that always draws the door in the closing direction from the opened state is also provided, it can be developed as a braking device with an automatic closing mechanism. The closing device may be a simple device that simply pulls the door body, such as a structure using a mainspring spring and a wire wire, etc., and when the hand is released after releasing the door body, it automatically closes. The gears and the rack are separated when the speed is reduced to a slow predetermined speed. Even at this stage, the door is still drawn by the closing device, so it does not stop at the middle position, and it closes slowly and securely until the end. Is obtained.

  In addition, by attaching another receiving device or main body device to the upper frame or the upper suspension side of the door body in a symmetrical direction, even when the door body is fully opened, it is closed one step before it is fully opened The same deceleration operation can be obtained, and collision and rebounding at the door bottom side can also be prevented.

  The main unit is composed of only the gear including the main body case, the swinging member, and the speed reducer, and the receiving device is composed of only the receiving case and the abutting member integrally molded with the rack, both of which are configured with a very small number of parts. Therefore, it can be made into an inexpensive and compact form, and since the operation is simple, there is little fear of malfunction.

  Embodiments of a sliding door braking device according to the present invention will be described below with reference to the drawings. 1-8 has shown 1st embodiment of this invention, FIG. 1 mounts the main body apparatus a in the door-end side of the upper frame 18, and the receiving apparatus b in the door-end side upper part of the door body 17, It is the perspective view which showed the state just before both face each other when the door 17 is closed. 2 is a perspective view of the main body device a, FIG. 3 is a perspective view showing an example of attaching the speed reduction member 5 having the gear 4 to the swing member 2, and FIG. 4 is a front view of the main body device a.

  As shown in FIG. 2, the main body device a includes a box-shaped main body case 1 and a swing provided with a speed reduction member 5 and a protruding portion 6 which are provided with a gear 4 so that a constant load is applied when the gear 4 rotates. The swinging member 2 is assembled with the rotating shaft 3 so as to be rotatable only by a certain angle in parallel to the surface of the door body 17 in the main body case 1. At this time, the side surface of the gear 4 is arranged so as to be parallel to the surface of the door body 17, the speed reduction member 5 having the gear 4 is provided on one side of the rotating shaft 3 of the swing member 2, and the protruding portion 6 is provided on the other side. deep. Further, a weight member 10 is attached to the protruding portion 6 side with the rotary shaft 3 as a boundary. The weight member 10 is for increasing the protruding portion 6 side of the swinging member 2 with the rotary shaft 3 as a boundary. In a natural state, the gear 4 is positioned above the rotary shaft 3 as shown in FIG. In the raised state, the protruding portion 6 is set so as to be located further below the lowermost portion of the gear 4.

  FIG. 3 is a perspective view of a state in which the speed reduction member 5 having the gear 4 and the weight member 10 are attached to the swing member 2. The speed reduction member 5 and the gear 4 are already assembled and used as they are. It is easy to install so as to fit into the swing member 2. Any mechanism may be used for generating a load by rotating the gear 4 of the speed reduction member 5, but a plurality of disc spring washers are formed by a washer-like member made of a material having excellent wear resistance. A mechanism such as a torque hinge that applies a load at the time of rotation using the force and friction force of the spring, which is configured to be sandwiched and rotated in conjunction with the gear 4, or a highly viscous silicone oil and blade shape in the housing A rotary damper or the like that applies a load by rotating the blade-like member while pushing away oil when the gear 4 rotates is suitable. These oil-type rotary dampers include a high-grade type in which oil flows through an orifice and a type in which a load is applied only to one direction of rotation. It may be the simplest and cheapest that only requires a load.

  FIG. 5 is a perspective view of the receiving device b, and FIG. 6 is a front view. As shown in FIG. 5, the receiving device b has an elongated shape and includes a receiving case 7 provided with a contact member 9 at one end and a continuous rack 8 disposed therein. At this time, the rack 8 faces upward. Keep it open. The contact member 9 at the end of the receiving case 7 may be made of a soft material such as rubber or elastomer. The position where the main body device a and the receiving device b are mounted is not particularly limited, but as shown in FIG. 1, the main body device a and the receiving device b are distributed and mounted on the door 17 upper door side and the upper frame 18 door side. The arrangement is excellent, the main body device a is always above the receiving device b, and the vertical position is set so that the abutting member 9 contacts the protruding portion 6 when they face each other.

  Next, the deceleration operation by closing the door 17 will be described with reference to FIG. FIG. 7 is a trajectory diagram showing in sequence from the stage in which the door body 17 moves in the closing direction until the main body device a and the receiving device b face each other until they are completely closed. First, when the state of FIG. 7A is set to the release position of the swinging member 2 and the door body 17 is closed from a state of being largely opened, at an initial stage where the main body device a and the receiving device b face each other, FIG. As shown in FIG. 7, the contact member 9 of the receiving device b comes into contact with the protruding portion 6 of the swing member 2, and the swing member 2 is further rotated as shown in FIG. 7B.

  Here, when the closing speed of the door body 17 is high, the contact member 9 strongly collides with the protruding portion 6, so that the gear 4 is moved downward by instantaneously rotating the swinging member 2 as shown in FIG. The gear 4 engages with the rack 8. At this time, the swing member 2 is preferably restricted so that it can only rotate to the position shown in FIG. Further, since the door body 17 continues to move even at the moment of engagement, the gear 4 rotates and the deceleration operation is started, and a frictional force is generated at the contact point between the gear 4 and the rack 8. At this time, if the contact point position where the gear 4 and the rack 8 are engaged is set below the rotary shaft 3, this frictional force is applied in a direction to further rotate the gear 4 position of the swing member 2 downward. . Therefore, while this frictional force is greater than the force with which the swing member 2 attempts to return to the release position due to the weight balance, the deceleration operation is continued while the rack 8 and the gear 4 are engaged as shown in FIG. In addition, the speed of the door body 17 is further reduced. This frictional force increases as the speed of the door body 17 increases, and decreases as the speed decreases. Therefore, even if the vehicle is decelerated to some extent, when the speed of the door body 17 is still high, the gear 4 is not detached from the rack 8 due to the frictional force between the gear 4 and the rack 8. Further, the state shown in FIG. 7D is defined as the engaging position of the swing member 2.

  Next, the door body 17 is decelerated to a considerably slow predetermined speed, and when the force to rotate the swinging member 2 in the direction of returning in a weight balance wins from the frictional force generated in the gear 4 and the rack 8. As shown in FIG. 7E, the gear 4 is detached from the rack 8 and naturally returns to the release position, and the deceleration operation is completed. Therefore, if it is set so that the door body 17 is still closed at a low speed at this stage, the door body 17 can be continuously closed. Here, the running condition of the door 17, the friction condition of the gear 4 and the rack 8, and the weight balance of the swinging member 2 are set as appropriate, and the gear 4 and the rack 8 are detached when the speed is reduced to the most suitable speed. If it is set to do so, the door body 17 is once decelerated to a relatively slow predetermined speed, and then the operation of gradual closing as it is is obtained. Further, as shown in FIG. 7 (f), it is possible to stop without bouncing in a completely closed state.

  Assuming that the closing speed is extremely high, the swinging member 2 is very strongly lifted up at the stage of FIG. 7B, and the gear 4 instantly engages with the engagement shown in FIG. 7C. The position will be reached. At this time, it is sufficient that the gear 4 and the rack 8 are engaged with each other in a timely manner. However, if the rotation of the swinging member 2 is too fast, the swinging member 2 rotates again in the reverse direction and rebounds before being engaged. There is a concern that Therefore, it is preferable to provide means for holding the engagement position without rebounding when the swinging member 2 rotates. The engagement position holding means may be of any method, but as shown in FIG. 5, a magnet 11 is arranged at the end of the continuous rack 8 of the receiving device b on the abutting member 9 side, as shown in FIG. The configuration in which the suction member 12 such as a steel plate is provided at the end of the swing member 2 of the main body device a on the gear 4 side is simple.

  Further, the length of the continuous rack 8 is not particularly limited, but it is necessary to set the length so that it cannot be decelerated even when an adult applies force and closes the door 17. . The maximum amount of deceleration is set by the distance between the load of the speed reduction member 5 and the rack 8. The rack 8 needs to be shortened when the load of the speed reduction member 5 is strong, and the rack 8 needs to be lengthened when the load is weak. Further, if the load on the speed reduction member 5 is strong, a large amount of deceleration can be obtained at a short distance. However, if the load is too strong, the operation stops suddenly and the speed reduction operation is not so good. It is considered that the load is small and it is better to set the rack 8 longer.

  Further, when the speed of the door body 17 that is slowly closed while holding the pulling hand is considerably low, the force with which the contact member 9 collides with the protruding portion 6 is small. As shown in FIG. 7 (b), the gear 4 is not engaged with the rack 8 by only a slight rotation, and therefore the speed reduction operation is not performed. When the door body 17 is further closed, the swinging member 2 returns to the release position by its own weight, and remains in a completely closed state as shown in FIG. Since the speed of the door 17 at this time is slow, no rebound or impact occurs. The rotation condition of the rocking member 2 with respect to the collision force can be arbitrarily set by the distance from the rotating shaft 3 to the protruding portion 6, the angle of the inclined surface of the protruding portion 6, and the weight and position of the weight member 10. If the closing speed is further increased, the door body 17 will rebound, and it is preferable to set the rack 8 and the gear 4 to be barely engaged when the boundary speed is exceeded.

  However, since the recent sliding doors have very good running performance, the condition when the gear 4 and the rack 8 are separated from each other is to prevent a slight noise or a slight rebound when the door 17 is closed. Needs to be set to a state in which the speed of the door 17 after leaving is extremely slow. In addition, the friction condition between the gear 4 and the rack 8 varies depending on the climate, room temperature, and surrounding environment, and the traveling condition of the door body 17 may change due to dust, a deviation after installation, and the like. It is assumed that the door body 17 may stop during the closing movement after completion of the deceleration operation. When the rack 8 is relatively long, the rack 8 and the gear 4 are engaged with each other at a very low speed for a short distance and immediately return to the release position. When the door 17 is returned to the release position after being engaged until the door 17 is released at the same speed, the remaining distance until the door 17 is completely closed changes. It may be difficult to stop the door body 17 in a completely closed state.

  Therefore, the important point is that even if the door 17 stops in the middle of deceleration or stops in the middle of the closing movement after the gear 4 and the rack 8 are detached, the gear 4 and the rack 8 This means that the frictional force of the gear 4 has already disappeared, that is, the gear 4 member is surely detached from the rack 8 when it is stopped. Therefore, when the remaining open portion is closed again, the braking device is not loaded and can always be performed with a light operation.

  FIG. 8 is a trajectory diagram sequentially illustrating the operation when the door 17 is opened from the closed state. As shown in FIG. 8A, the swing member 2 is in the release position when the door 17 is completely closed. Since the gear 4 and the rack 8 are surely detached, the door 17 can be always opened by a light operation. Further, when the door body 17 is vigorously opened, the abutting member 9 collides with the protruding portion 6 at the position shown in FIG. 8B in the middle of opening, the swinging member 2 rotates, and the gear 4 engages with the rack 8. However, as shown in FIG. 8 (c), this engaging operation is at the door-side end position after almost passing through the continuous rack 8, and the subsequent moving direction is away from the rack 8. Therefore, it will not decelerate. When the door 17 is further opened, the swing member 2 returns to the release position and is held as it is.

  Next, 2nd embodiment of the braking device for sliding doors of this invention is described in FIGS. FIG. 9 is a perspective view in which the main body device a and the receiving device b in the second embodiment are distributed and mounted on the door body 17 and the frame, FIG. 10 is a perspective view of the main body device a, and FIG. 11 is a perspective view of the receiving device b. FIG. In the second embodiment, the configuration of the main body device a in which the swing member 2 incorporating the speed reduction member 5 having the gear 4 in the main body case 1 is rotatably mounted is the same as that of the first embodiment. 2 is provided with a weight member 10 and a projecting portion 6, and the weight balance between the projecting portion 6 side and the gear 4 side including the speed reduction member 5 with the rotary shaft 3 as a boundary is distributed so that the projecting portion 6 side is much heavier. . The configuration of the receiving device b including the receiving case 7, the rack 8, and the contact member 9 is the same as that of the first embodiment. Here, in the second embodiment, compared with the first embodiment, the contact member 9 pushes the protruding portion 6 to rotate the swinging member 2, and further sets the angle of the contact member 9 to the door body. It is set widely in the movement direction of 17.

  FIG. 12 is a trajectory diagram sequentially illustrating a deceleration operation by closing the door body 17 in the second embodiment. FIG. 12A shows a state immediately before the abutting member 9 of the receiving device b abuts against the protruding portion 6 of the oscillating member 2. At this time, the oscillating member 2 is in the release position. FIG. 12 (b) shows a stage where the swinging member 2 is slightly rotated by contact, and when the door body 17 further moves, the swinging member 2 is pushed up to the maximum shown in FIG. The tip is on the upper surface of the contact member 9. This state is a position where the swinging member 2 is rotated to the maximum, and the gear 4 is set so as to be lowered to a position where it engages with the rack 8 at this time.

  That is, in the second embodiment, regardless of the closing speed of the door body 17, the rocking member 2 is always rotated to the state shown in FIG. 12C, and the gear 4 and the rack 8 are once forcedly engaged. Is the biggest feature. Further, from the state of FIG. 12C, the door body 17 is further moved by a minute distance so that the gear 4 is already engaged with the rack 8 at the final stage when the protruding portion 6 is on the upper surface of the contact member 9. Set it. At this stage, friction between the gear 4 and the rack 8 is generated, and the gear 4 and the rack 8 are decelerated while engaging with each other as shown in FIG. Therefore, a holding means such as a configuration using the magnet 11 and the attracting member 12 that holds the engagement position when the contact member 9 collides with the protruding portion 6 and the swinging member 2 rotates as in the first embodiment. Is not necessary. The release operation after deceleration is the same as in the first embodiment, and when the frictional force between the rack 8 and the gear 4 becomes smaller than the force to return due to the weight balance of the swing member 2, the release operation is performed as shown in FIG. To finish the deceleration operation.

  When the closing speed is very slow, the frictional force at the time of engagement is so small that it slightly moves from the stage of FIG. 12 (c) and swings as soon as the protruding portion 6 passes the contact member 9. The member 2 will return to the release position. Also in the second embodiment, the operation of continuing the movement at a predetermined speed after the release is exactly the same as in the first embodiment, and it is also preferable to set it so that it is completely closed without stopping in the middle as much as possible. . Even if it stops during deceleration or stops during the closing movement after release, the swinging member 2 has returned to the release position at that stage, as in the first embodiment. When closing the opening, it can be performed with a light operation.

  FIG. 13 is a trajectory diagram sequentially showing the opening operation in the second embodiment. FIG. 13A shows a closed state. When the door body 17 is opened, the contact member 9 comes into contact with the protruding portion 6 and swings as shown in FIG. 13C after the state shown in FIG. 13B. The member 2 is rotated. Here, in the second embodiment, since the contact member 9 has a width in the moving direction, the rotation operation of the swing member 2 causes the gear 4 to descend from the upper side of the end portion of the rack 8. . This is a problem that cannot be avoided because it is necessary to engage the gear 4 and the rack 8 with the protruding portion 6 on the upper surface of the contact member 9 when closed. Therefore, it is preferable that the bottom surface of the end portion on the abutting member 9 side of the rack 8 is released so as to have elasticity, so that the gear 4 can be engaged with the rack 8 without being damaged even when it comes into contact with the rack 8. . The engagement of the rack 8 and the gear 4 at the time of opening is only at the above position, and thereafter, the rack 8 moves away as shown in FIG. The moving member 2 naturally returns to the release position.

  Next, a third embodiment of the present invention will be described with reference to FIGS. The third embodiment is almost the same as the second embodiment, except that the only means for releasing the swinging member 2 is not the weight balance by the weight member 10 but is forcibly released using a spring member. Is different. FIG. 14 is a perspective view of the main body device a in a state where the pressing spring 13 is used as the spring member, and FIG. 15 is a front view of the main body device a in a state where the kick spring 14 is used as the spring member. FIG. 16 is a trajectory diagram that sequentially shows the deceleration operation in the configuration in which the spring member 13 is used as the spring member. In the third embodiment, the braking operation is the second operation as shown in FIGS. 16 (a) to (e). The form is exactly the same. Here, the force for returning the swinging member 2 during the releasing operation is limited in the weight member 10, whereas the spring member can be released with a much larger force, and the material of the rack 8 and the gear 4 is very frictional. A feature is that even a combination that easily generates force can be handled.

  Here, when the second embodiment using the weight balance of the swing member 2 as the releasing means after deceleration is compared with the third embodiment using the spring member, the swing member 2 described above is the surface of the door body 17. There is little difference in the configuration in which the main body device a and the receiving device b are arranged up and down while rotating in parallel. However, in the second embodiment, since the releasing means of the swing member 2 requires gravity, Whereas the arrangement of the upper and lower of the receiving device b cannot be changed, in the configuration of the third embodiment, since the release means can be forcibly implemented by the force of the spring member, the reverse of the arrangement shown in FIG. This is also possible in an upside down arrangement in which the receiving device b is mounted on the upper frame 18 and the main body device a is mounted on the door 17. Further, by using a spring member, a configuration in which the rotation direction of the swinging member 2 is set on a horizontal plane is possible, and this point is further important. This configuration will be described below as a fourth embodiment.

  Next, 4th embodiment of the braking device for sliding doors of this invention is described in FIGS. FIG. 17 is a perspective view showing a state in which the main body device a and the receiving device b of the fourth embodiment are distributed and attached to the door-side upper part of the door body 17 and the door-side upper part of the frame body. 18 is a top view of the main body device a, and FIG. 19 is a top view of the receiving device b. As shown in FIG. 18, a swing member 2 having a gear 4, a speed reduction member 5, and a protruding portion 6 is provided, and the side surface of the gear 4 is directed vertically and the swing member 2 rotates on a horizontal plane. Mounted on the case 1 with the rotation shaft 3. As shown in FIG. 19, the rack 8 is continuously arranged on one side of the receiving case 7 in the horizontal direction, and the contact member 9 is arranged on the end of the receiving case 7 so as to protrude in the horizontal direction. Then, the pressing spring 13 is attached to the swing member 2 so that the gear 4 is urged in the direction in which the gear 4 is detached from the rack 8. In FIG. 17, the main body device “a” is mounted on the upper side of the door 17 and the receiving device “b” is arranged on the door side of the upper frame 18.

  FIG. 20 is a top surface locus diagram illustrating the deceleration operation in the fourth embodiment in order, and FIG. 21 is a longitudinal section locus diagram illustrating the same state. FIG. 20A shows a state immediately before the main body device a and the receiving device b face each other, and the swing member 2 is held at the release position. At this time, the oscillating member 2 can rotate only in the horizontal direction around the rotating shaft 3, and the gear 4 is biased by the push spring 13 toward the release position in which the gear 4 is housed in the main body case 1. In the fourth embodiment, when the door body 17 is closed, the gear 4 passes through the inside of the receiving device b. At the stage of FIG. The protruding portion 6 contacts, and the swing member 2 rotates against the push spring 13. The deceleration operation is the same as in the second embodiment and the third embodiment, and the gear 4 and the rack 8 are temporarily moved in the state where the swinging member 2 shown in FIG. As shown in FIG. 20 (d), the vehicle must be engaged, and a deceleration operation can be obtained by further movement of the door body 17. The release operation is the same, and the door body 17 moves, the protruding portion 6 moves away from the contact portion, decelerates to a predetermined speed, and the push spring 13 is released by the frictional force generated in the rack 8 and the gear 4. When the force is won, the swinging member 2 rotates in the returning direction, and the gear 4 and the rack 8 are detached as shown in FIG.

  FIG. 21 is a longitudinal cross-sectional trajectory diagram during the deceleration operation. Since the rotational operation of the swing member 2 having the gear 4 is in the horizontal direction, the engagement and disengagement states are difficult to understand, but the important point here is the door body. The fourth embodiment is relatively easy to cope with the change in the vertical position of the upper frame 18 and the upper frame 18. Many of the recent sliding doors can adjust the vertical position of the door body 17 with a door wheel or the like for adjustment of installation. In the first embodiment, the second embodiment, and the third embodiment described above, the door body 17 and the upper frame can be adjusted. If the position of 18 shifts in the vertical direction, the engagement condition between the gear 4 and the rack 8 changes, and the optimum function cannot be maintained. Therefore, either the main body device a or the receiving device b is held in a free state where it is lifted by a spring or the like, and both are guided and moved in the vertical direction when facing each other, forcibly at a predetermined vertical position. It is considered that a configuration that engages is required separately.

  In that respect, in the fourth embodiment, as can be seen in FIG. 21, the length of the horizontal rack 8 in the vertical direction is set to be relatively long, and the height of the gear 4 position of the main body device a is raised. It will be. That is, if the gear 4 is set to engage with the vicinity of the center in the vertical direction of the rack 8 in the reference state, the gear 4 does not move even if the door body 17 moves up and down within the vertical range of the rack 8. It does not come off the rack 8 and does not affect the deceleration operation. Therefore, the fourth embodiment is considered to have a further excellent configuration.

  In addition, as described above, in terms of certainty, after decelerating to a predetermined speed, the decelerating operation is terminated by the release means, and the closing operation is continued without stopping as it is. Expected to be very difficult. Therefore, it is preferable to add a means for setting the predetermined speed when the gear 4 and the rack 8 are separated relatively fast, and holding the door body 17 with a weak force in a state where the door end is in close contact with the frame body and is completely closed. The holding means can be any mechanism that can barely prevent the door body 17 from being rebounded by the remaining slow speed after being decelerated to a predetermined speed, and can be held at that position. The configuration in which the holding roller is fitted to the magnet, the configuration in which the magnet catch and the steel plate are distributed and mounted, etc. are inexpensive and simple.

  FIG. 22 shows the simplest configuration in which the above-mentioned closed state holding means is incorporated in the main body case 1 and the receiving case 7, and in each drawing in the first embodiment, the second embodiment, and the third embodiment described above. Also displays the same. First, a leaf spring 15 bent in a dogleg shape is attached to the door end side end of the main body case 1, and at this time, the bottom end of the dogleg shape of the leaf spring 15 is arranged below the upper surface of the contact member 9. Keep it. FIG. 22 (a) shows a state immediately before complete closing, and in the final stage of closing, as shown in FIG. 22 (b), the contact member 9 gets over the leaf spring 15, and FIG. The door body 17 can be held in the closed state. When such a closed state holding means is used in combination, it is possible to simultaneously prevent a malfunction in which the door body 17 is arbitrarily opened from the closed state due to the inclination or vibration of the rail.

  Further, if a closing device 16 that always draws the door 17 in the closing direction from the opened state is also provided, it can be developed as a braking device with an automatic closing mechanism. That is, when the door 17 is strongly closed by a human hand or when the door 17 is closed by the closing device 16, the operation of the door 17 is the same, and the same braking operation is obtained. Therefore, the mechanism of the closing device 16 may be merely a mechanism for pulling the door body 17, and a structure in which a weight that has been conventionally used is suspended and closed by the weight of the weight, or is closed by a mainspring spring and a wire wire. A configuration, a configuration in which the rail is closed using a coupling spring, a configuration in which the rail itself is inclined and closed by the dead weight of the door body 17 are simple. FIG. 23 is a perspective view of the appearance of the closing device 16 having the structure using the mainspring spring and the wire, and the pulling force can be adjusted. FIG. 24 is a perspective view of the closing device 16 according to the second embodiment. It is a front view which shows the state integrated in.

  In the case where the closing device 16 is mounted together as shown in FIG. 24, the door 17 is released after the door 17 is released, and the door is naturally closed, and the deceleration operation starts from the stage where the main body device a and the receiving device b face each other. Is obtained, and the gear 4 and the rack 8 are detached at a stage where the speed is reduced to a predetermined speed. However, since the door body 17 is continuously drawn by the closing device 16 even when it is detached, the door body 17 is not stopped at a midway position, and an operation of closing the door body 17 as it is can be obtained. Therefore, the setting of the predetermined speed to be released after deceleration may be an extremely slow speed, and it is preferable to release it in a state where it is almost stopped and then slowly close it completely with the force of only the closing device 16. Further, when the closing device 16 is used in combination, the above-mentioned closed state holding means is not necessary.

  In the above description, the braking operation when closing the door body 17 has been described. However, since the recent sliding door has become very light in opening and closing operation, if the door is opened strongly at the time of opening, the door butt side is left with a momentum. And rebounds like when closed, and at the same time, the problem of collision noise and impact occurs. Therefore, a mechanism for braking the door 17 even when it is opened has been required. Regarding this problem, the combination of the main body device a and the receiving device b may be arranged on the other side of the door. However, this is doubled in terms of cost and is considered to be a heavy burden. Therefore, as shown in FIG. 25, means for sharing either the main body device a or the receiving device b is effective.

  FIG. 25 is a front view when the configuration for preventing the rebound at the time of opening described above is applied to the third embodiment, and is similarly possible in other embodiments. In this configuration, as shown in FIG. 25, the receiving device b having the shape having the contact members 9 is provided at both the left and right ends of the receiving case 7, and is attached to the upper part of the door 17 on the door tip side. Then, as described above, the main body device a is mounted on the door end side of the upper frame 18, and another main body device a is added so that the upper frame 18 faces the receiving device b when the door body 17 is opened. It is good to install with the main body apparatus a on the door end side in a symmetrical arrangement. Then, the abutting member 9 and the protruding portion 6 of the added main body device a abut at a position slightly before the door 17 is completely opened, and the swinging member 2 rotates to engage the gear 4 and the rack 8. Thus, a deceleration operation can be obtained, and it is possible to prevent a rebound and an impact sound during the opening operation.

  Further, when the brake device is also braked in the opening direction as shown in FIG. 25 and the closing device 16 as shown in FIG. If the holding force of the holding means such as the leaf spring 15 of the door-side main unit a added here is set larger than the pulling force by the closing device 16, it can also be used as a stopper at the time of opening. Is also possible. Thus, by combining various closed state holding means and the closing device 16 based on the braking device of the present invention, it can be developed as a sliding door opening / closing braking device having a wide range of configurations.

It is the accommodation perspective view of 1st embodiment of this invention. It is a perspective view of a main part device of a first embodiment of the present invention. FIG. 3 is a perspective view of a speed reduction member including a gear and a swing member according to the first embodiment of the present invention. It is a front view of a main part device of a first embodiment of the present invention. It is a perspective view of a receiving device of a first embodiment of the present invention. It is a front view of a receiving device of a first embodiment of the present invention. It is a front locus figure showing braking operation at the time of closure of a first embodiment of the present invention. It is a front locus figure showing operation at the time of opening of a first embodiment of the present invention. It is the accommodation perspective view of 2nd embodiment of this invention. It is a perspective view of a main unit of a second embodiment of the present invention. It is a perspective view of the receiving apparatus of 2nd embodiment of this invention. It is a front locus figure showing braking operation at the time of closure of a second embodiment of the present invention. It is a front locus figure showing operation at the time of opening of a second embodiment of the present invention. It is a perspective view of the main body apparatus of the 3rd embodiment of this invention of the structure which used the press spring for the cancellation | release means. It is a front view of the main body apparatus of the structure which used the kick spring for the cancellation | release means of 3rd embodiment of this invention. It is a front locus figure showing braking operation at the time of closure of a third embodiment of the present invention. It is the accommodation perspective view of 4th embodiment of this invention. It is a top view of the main body apparatus of 4th embodiment of this invention. It is a top view of the receiving apparatus of 4th embodiment of this invention. It is a top surface locus diagram which shows braking operation at the time of closure of a 4th embodiment of the present invention. It is a front locus figure showing braking operation at the time of closure of a 4th embodiment of the present invention. It is a front view which shows an example of the closed state holding | maintenance means used together with the braking device of this invention. It is a perspective view showing an example of a closure device used in conjunction with the braking device of the present invention. It is a front view which shows the structure which incorporated the closure apparatus in the main body apparatus of the braking device of this invention. It is a front view of the composition which enabled braking also at the time of opening of the braking device of the present invention.

Explanation of symbols

a body device b receiving device 1 body case 2 oscillating member 3 rotating shaft 4 gear 5 deceleration member 6 protruding portion 7 receiving case 8 rack 9 abutting member 10 weight member 11 magnet 12 adsorbing member 13 push spring 14 kick spring 15 leaf spring 16 Closing device 17 Door 18 Upper frame

Claims (9)

A device that brakes the speed at the time of opening and closing of a sliding door composed of a door and a frame, and is composed of a main body device and a receiving device. A speed reducing member having such a configuration, the swinging member is rotatably connected to the main body case by a rotating shaft, and the speed reducing member having a gear is arranged on one side of the rotating shaft of the swinging member, and protrudes to the other The receiving device has a long shape, and has a receiving case provided with an abutting member at the end and a continuous rack disposed therein, and the main body device and the receiving device are connected to a door and a frame. The sliding door brake device is mounted so as to face each other. In the initial stage where the main body device and the receiving device face each other due to the movement of the door, the contact member of the receiving device contacts the protruding portion of the swinging member to rotate the swinging member. The gear engages with the rack, and the door is decelerated due to the load of the speed reduction member accompanying the rotation of the gear, and the gear is detached from the rack when the door stops or decelerates to a predetermined slow speed. 2. The sliding door braking device according to claim 1, further comprising a release means. The gear is disposed so that a side surface thereof is parallel to the door body surface, a swing member is attached to the main body case so as to rotate in parallel with the door body surface, a rack of the receiving device is continuously provided upward, and the release means The weight balance between the projecting part side and the gear side with the rotation axis as the boundary is set so that the projecting part side becomes heavy, and when the door body is at low speed, the projecting part of the swinging member is slightly The gear and the rack do not engage with each other simply because they are lifted, and when the door is at a high speed, the abutting member collides with the protruding portion and rotates the swinging member so that the gear and the rack are engaged. When the gear stops when the door stops or decelerates to a predetermined speed and the force that the swinging member tries to return in a weight balance wins over the frictional force generated in the gear and the rack, A contract characterized by being detached from the rack Sliding door braking device according to claim 1 or 2. The gear is disposed so that a side surface thereof is parallel to the door body surface, a swing member is attached to the main body case so as to rotate in parallel with the door body surface, a rack of the receiving device is continuously provided upward, and the release means The weight balance between the protruding part and the gear side with the rotation axis as the boundary is set so that the protruding part side becomes heavy, and the swinging member regardless of the door speed by the contact member and the protruding part abutting Is rotated to a certain angle, and once the gear is forcibly engaged with the rack to obtain a deceleration operation, the door moves and the protruding part comes off the contact part, and the door stops or reaches a predetermined speed. 3. The sliding door according to claim 1, wherein the gear is detached from the rack at a stage where the force that the swinging member tries to return in a weight balance wins from the friction force generated in the gear and the rack. Braking device. The gear is arranged so that the side surface is parallel to the door body surface, and a swing member is mounted on the main body case so as to rotate in parallel with the door body surface, and the rack of the receiving device is continuously provided in either the top or bottom direction, As the release means, a spring member is mounted on the swinging member so as to urge the gear in a direction to disengage from the rack, and the swinging member is brought into contact with the projecting portion regardless of the speed of the door body. Is rotated to a certain angle, and once the gear is forcibly engaged with the rack to obtain a deceleration operation, the door moves and the protruding part comes off the contact part, and the door stops or reaches a predetermined speed. The sliding door braking device according to claim 1, wherein the gear is detached from the rack when the biasing force of the spring member is greater than the friction force generated in the gear and the rack. The gear is arranged so that the side faces are up and down, a swinging member is mounted on the main body case so that the rotation direction is on a horizontal plane, the rack of the receiving device is continuously provided in the horizontal direction, and a spring as the release means The member is mounted on the swinging member so that the gear is urged away from the rack, and the swinging member is brought to a certain angle regardless of the speed of the door body by the contact member and the projecting portion contacting each other. Rotate and forcefully engage the gear with the rack once to obtain a deceleration operation, and the door body moves and the protruding part comes off the contact part, the door body stops or decelerates to a predetermined speed, The sliding door braking device according to claim 1 or 2, wherein the gear is detached from the rack when the biasing force of the spring member is greater than the friction force generated in the gear and the rack. A holding means for stopping the door in a completely closed position is also provided, and the holding force of the holding means can be barely prevented from rebounding by the slow speed remaining after being decelerated to a predetermined speed. The sliding door braking device according to any one of claims 1 to 6, wherein the braking device is set to a degree. The braking device for sliding doors according to any one of claims 1 to 6, further comprising a closing device that always draws the door in the closing direction from the opened state. Add another one of the main unit or receiving device and attach it to the upper frame or the top of the door in a symmetrical position, braking the speed when the door is strongly opened. The braking device for sliding doors according to any one of claims 1 to 8, wherein

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