JP2013127190A - Unfolded state fixing device of folding type door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an unfolded state fixing device of a folding type door which can reduce a burden on mounting work.SOLUTION: An unfolded state fixing device of a folding type door includes: a lock arm 11 which is mounted to a second door 2 side and can move between a lock position where a predetermined area projects form the second door 2 side to a first door 1 side to be located at the front side of the first door 1 and a lock release position where the predetermined area retreats to the second door 2 side; and an arm position control mechanism which is mounted to the second door 2 side, holds the lock arm 11 at the lock release position in a folded state of both doors 1, 2, and moves the lock arm 11 to the lock position when both doors 1, 2 become an unfolded state. Both doors 1, 2 are fixed in the unfolded state by the lock arm 11 located at the lock position and can be integrally opened and closed.

Description

  The present invention relates to a fixing device for enabling a folding door such as a double folding door to be integrally opened and closed in an unfolded state.

  For example, a double-fold door may be used as a fire door. This two-fold door is normally stored in the door pocket in a folded state. In the event of a fire, the first door on the proximal end side comes out in a folded state while rotating from the door pocket, and the second door on the distal end side is further away from the first door. Thus, the second door is also closed by rotating to the tip side. Thus, a passage is closed because both doors will be in an unfolded state.

  A fixing device is used to open and close the doors in an unfolded state. For example, the fixing device described in the following publication is proposed. That is, a link is attached to the proximal end of the second door, and a locking member for locking the link is attached to the distal end of the first door. Then, the link is automatically locked to the locking member, and both doors are held in the unfolded state.

  However, in the fixing device having this configuration, it is necessary to attach members to both doors at the time of construction, and it is necessary to consider the mutual relationship between the attachment positions.

Japanese Patent No. 3497204

  Therefore, the present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide an unfolded state fixing device for a folding door that can reduce the burden of attachment work.

  The present invention has been made to solve the above-described problems, and the folding door fixing state fixing device according to the present invention is folded so that the front surfaces of the proximal end door and the front end door face each other. From the folded state, the front door is attached to a foldable door that is turned to the closed side so that it is separated from the proximal door, and can be opened and closed by fixing both doors in the expanded state. A folding state fixing device for a foldable door to be attached to one door side of both doors, and a predetermined area projects from one door side to the other door side and the front of the other door A lock arm movable between a lock position located on the side and a lock release position where the predetermined area is retracted to one door side, and a lock arm attached to one door side in a folded state of both doors Is in the unlocked position and both doors are unfolded Comes to an arm position control mechanism for moving the locking arm in the locking position, both the door by the lock arm is located in the locking position, characterized in that it is configured to be secured in the deployed state. In the present invention, the front surface of the door means a facing surface in the folded state.

  The fixing device having such a configuration is used by being attached to one of the door on the proximal end side and the door on the distal end side. For example, when it is attached to the front door, the arm position control mechanism moves the lock arm so as to protrude toward the base door so that the lock arm is positioned at the lock position. A predetermined area on the base end side of the lock arm at the lock position is located on the front side of the door on the base end side, and both doors are fixed in an unfolded state by the lock arm, and both doors can be integrally opened and closed.

  In particular, the lock arm is configured to be slidable from one door side to the other door side, and the lock arm is slid so as to protrude from the one door side to the other door side to be in the locked position. preferable. Although the lock arm can be configured to rotate, the device can be made compact and simplified by adopting a configuration in which the lock arm is slid and its predetermined region is positioned on the front side of the first door.

  Further, the arm position control mechanism includes an urging means for urging the lock arm toward the lock position, an engagement means for engaging the lock arm at the unlock position against the urging force of the urging means, It is preferable to include a locking release mechanism that releases the locked state of the lock arm by the locking means. The lock arm can be easily held at the unlock position by the locking means, and can be easily moved to the lock position by the biasing means and the lock release mechanism.

  Furthermore, it is the structure attached to the door side of the front end side among both doors, The latch release mechanism is equipped with the release arm which can move independently of the lock arm, and it is in the state from the folded state to the unfolded state. It is preferable that the releasing arm is configured to release the locking state by the locking means when the release arm comes into contact with, presses, and moves with the rotation of the front door. In this configuration, the release arm is pressed against the door on the proximal end side from the folded state to the unfolded state, and the locking arm is released from the locking state by using the pressing force. To do. Accordingly, the locked state can be released in conjunction with the turning operation of the door on the front end side, and the lock can be released using the force for turning the door on the front end side.

  As described above, in the unfolded state fixing device for a foldable door according to the present invention, it can be attached to one of the base end side door and the front end side door, so that the mounting work burden during construction is small. I'll do it.

It is a top view which shows the use condition of the expansion | deployment state fixing device of the folding door in one Embodiment of this invention, Comprising: The folding door is shown in the state fixed to the expansion | deployment state. The front view of the state of FIG. It is a top view which shows the use condition of the fixing device in the embodiment, Comprising: The folding door shows the state by which fixation of the expansion | deployment state was cancelled | released. The front view of the state of FIG. It is sectional drawing which shows the use condition of the fixing device in the embodiment, (a) shows the state by which the folding door was fixed to the expansion | deployment state, (b) has released the fixation of the folding door by the expansion | deployment state. Indicates the state. AA sectional drawing of FIG. It is a figure which shows the state by which the lock arm of the fixing device in the embodiment was latched by the lock release position, Comprising: (a) is sectional drawing seen from the plane, (b) is sectional drawing seen from the front. BB sectional drawing of FIG.7 (b). It is a figure which shows the state by which locking of the lock arm of the fixing device in the embodiment was cancelled | released, Comprising: (a) is sectional drawing seen from the plane, (b) is sectional drawing seen from the front. It is a top view for demonstrating operation | movement of the fixing device in the embodiment, Comprising: The state by which a foldable door is folded is shown. It is a top view for demonstrating operation | movement of the fixing device in the embodiment, Comprising: (a) shows the state in the middle of unfolding of a folding door, (b) is a folding door from the state of (a). Shows a state when the lock arm is further closed and the lock arm is released. It is a top view for demonstrating operation | movement of the fixing device in the embodiment, Comprising: (a) shows the state in the middle of the folding door being folded, (b) is a folding door from the state of (a). Shows the state when is further opened. It is a top view for demonstrating operation | movement of the folding door in which the fixing device in the embodiment is used, Comprising: (a) showed the accommodation state of the folding door, (b) closed the 1st door. A folded state is shown, (c) shows the unfolded state in which both doors are closed.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a folding door deployment state fixing device according to an embodiment of the present invention will be described with reference to the drawings. First, it is a fire door as an example of a folding door to which the fixing device is attached. An outline of the operation of the double-fold door will be described with reference to FIG. In the state where the door closes the passage, one surface facing in the opening direction of the door is referred to as a front surface, and the opposite surface is referred to as a back surface. Also, the front side is the front side, the back side is the rear side, and the left and right directions are based on the case when viewed from the front.

  As shown in FIG. 13, the double-folded door includes a first door 1 on the proximal end side and a second door 2 on the distal end side. The first door 1 is supported by the wall of the passage around the base end portion. The second door 2 is supported by the distal end portion of the first door 1 so as to rotate horizontally around the vertical axis about the base end portion.

  Specifically, the first door 1 is rotatably supported by a door frame 5 on the wall of the passage via an auto swing hinge 3 and is urged toward the closing side by the auto swing hinge 3. The second door 2 is rotatably supported on the tip of the first door 1 via an auto swing hinge 4 and is urged by the auto swing hinge 4 in the unfolding direction away from the first door 1. Has been.

  Both doors 1 and 2 are fire doors and are normally stored in a door pocket 6 provided on the wall of the passage in a folded state as shown in FIG. . When the release 7 receives a signal from the control panel or the like and releases the holding of the second door 2 in the event of a fire, the doors 1 and 2 are folded by the automatic swing hinge 3 as shown in FIG. It turns to the closing side. And when the 1st door 1 will be in a closed state, while the 1st door 1 will be hold | maintained at the door frame 5, holding | maintenance of the folding state of the 1st door 11 and the 2nd door 2 will be cancelled | released, As indicated by a two-dot chain line in 13 (c), the second door 2 is rotated toward the closing side by the automatic swing hinge 4. And when the front-end | tip part of the 2nd door 2 contact | abuts to the door frame 5 and it will be in a closed state as shown with a continuous line in FIG.13 (c), both the doors 1 and 2 will be in a linear expansion | deployment state, and will pass a passage. Close completely.

  The unfolded state fixing device for the folding door according to the present embodiment includes an auto swing hinge 3 that is the center of rotation of the first door 1 with both doors 1 and 2 remaining unfolded as shown in FIG. Both doors 1 and 2 are fixed so that they can be integrally opened and closed as a fulcrum. The fixing device is used by being attached to the second door 2, and is supported by the base 10 attached to the front surface 2 a of the second door 2 and slidable in the horizontal direction on the base 10. A lock arm 11 and an arm position control mechanism for controlling the position of the lock arm 11 are provided. The lock arm 11 has a predetermined area protruding from the second door 2 side to the first door 1 side and positioned on the front 1a side of the first door 1, and the predetermined area is the second door 2. The arm position control mechanism holds the lock arm 11 in the unlocked position when the doors 1 and 2 are folded, and the doors 1 and 2 are slidable. When is in the deployed state, the lock arm 11 is moved to the lock position. The arm position control mechanism includes: an urging unit that urges the lock arm 11 toward the lock position; and an engagement unit that engages the lock arm 11 at the unlocking position against the urging force of the urging unit. A locking release mechanism for releasing the locking state of the lock arm 11 by the locking means. 1 and 2, when the lock arm 11 slides from the second door 2 toward the first door 1 and the predetermined area is located on the front side of the first door 1, both doors 1, 2 is in a state of being able to rotate integrally through the lock arm 11. Details will be described below.

  The base 10 is formed from a sheet metal, for example, in a substantially U shape in cross section as shown in FIG. 6, and includes an upper surface wall portion 20, a side wall portion 21, and a lower surface wall portion 22 so that the opening faces the front side. The second door 2 is attached. That is, the base 10 is attached to the second door 2 with the screw 23 from the front side in the side wall portion 21. The base 10 has a shape that is long in the lateral direction, and is attached to the base end portion of the second door 2 so that the longitudinal direction thereof is the horizontal direction. The base 10 is provided with a guide roller 24 for guiding the slide movement of the lock arm 11. The guide roller 24 is configured to rotate about the vertical direction as an axis. Specifically, the guide roller 24 is centered on a support shaft 24a fixed so as to bridge the upper surface wall portion 20 and the lower surface wall portion 22 of the base 10 up and down. It is rotatable and is arranged so as to form a space in which the guide roller 24 can travel between the side wall portion 21 and the side wall portion 21. A pair of guide rollers 24 are arranged at intervals in the left-right direction. Both guide rollers 24 and the side wall portion 21 guide the lock arm 11 from the front and rear, and the upper surface wall portion 20 and the lower surface wall portion 22 support the lock arm 11. Guide from the top and bottom. Further, a part of the side wall portion 21 of the base 10 is bent toward the front side to form a spring pressing portion 25. The spring holding portion 25 is in contact with the right end portion of the coil spring 26. The right end or one end of the coil spring 26 is the end far from the first door 1, and the left end or other end of the coil spring 26 is the end closer to the first door 1. It is. The coil spring 26 constitutes an urging means for urging the lock arm 11 toward the first door 1 in the horizontal direction. A spring guide 27 having a circular cross section is screwed to the spring pressing portion 25, and the right end of the coil spring 26 is engaged with the spring guide 27 so that the spring guide 27 is positioned inside the coil spring 26. A cushioning material 28 for absorbing and mitigating vibration when the end portion 11a of the lock arm 11 collides is attached to the surface opposite to the surface in contact with the coil spring 26 of both surfaces of the spring pressing portion 25. ing.

  The lock arm 11 is supported by the base 10 so as to be slidable in the horizontal direction, and as shown in FIGS. As shown in FIGS. 3, 4, and 5 (b), the doors 1 and 2 are slid between a lock release position that is a position for releasing the fixation. The lock arm 11 protrudes from the second door 2 to the first door 1 side so that the predetermined region on the left side is located on the front side of the first door 1 in the locked position, and the doors 1 and 2 are horizontally moved. It takes a posture to bridge, and in the unlocked position, it is retracted to the base 10 and the predetermined area on the left side does not protrude to the first door 1 side, but the whole is located on the front side of the second door 2. Take a posture to do.

  The lock arm 11 is also made of, for example, a sheet metal, and is formed in a substantially U shape in a sectional view as shown in FIG. 6 from the upper surface wall portion 30, the side wall portion 31, and the lower surface wall portion 32. Is inserted between the side wall 21 of the base 10 and the guide roller 24. The lock arm 11 is also longer in the lateral direction and longer than the base 10. The side wall surface portion 31 at the right end portion 11a of the lock arm 11 is bent toward the rear side, and a knob 33 is screwed to the end portion 11a. The right end portion 11a of the lock arm 11 is located on the right side of the spring pressing portion 25 of the base 10, and the lock arm 11 protrudes toward the first door 1 as shown in FIG. In the position, the right end portion 11a of the lock arm 11 abuts against the cushioning material 28 attached to the spring pressing portion 25, thereby preventing further movement of the lock arm 11 toward the first door 1 side. It is like that. A roller 34 that rotates about the vertical direction as an axis is provided at the left end of the lock arm 11. That is, a support shaft 34a is attached to the left end portion of the lock arm 11 so as to bridge the upper surface wall portion 30 and the lower surface wall portion 32, and the roller 34 rotates around the support shaft 34a. The roller 34 is disposed on the rear side of the side wall portion 31 of the lock arm 11 at a position where it can contact the front surface 1a of the first door 1 and the front surface 2a of the second door 2. 11 is rotated while being in contact with the front surface 1a of the first door 1 and the front surface 2a of the second door 2 as the slide movement of the first door 1 is performed. A spring pressing portion 35 is formed on the right side of the roller 34 by bending a part of the side wall portion 31 toward the back side. The spring pressing portion 35 of the lock arm 11 contacts the left end of the coil spring 26. That is, the coil spring 26 is disposed in a compressed state between the spring pressing portion 35 of the lock arm 11 and the spring pressing portion 25 of the base 10, and the lock arm 11 is attached to the left side by the elastic restoring force of the coil spring 26. It is fast. A spring holder 36 is screwed to the rear side of the side wall portion 31 of the lock arm 11, and the left end of the coil spring 26 is inserted through the spring holder 36 in the horizontal direction so that the left side of the coil spring 26 is inserted. The vicinity of the end is supported.

  As described above, the lock arm 11 slides between the lock position and the lock release position, but the fixing device engages the lock arm 11 at the lock release position against the biasing force of the coil spring 26. Stopping means and a locking release mechanism that automatically releases the locking state of the lock arm 11 as the second door 2 unfolds from the folded state.

  An engaging recess 37 for locking that opens upward is formed on the upper wall 30 (upper surface) of the lock arm 11. The engaging recess 37 for locking is circular in a plan view as shown in FIG. 1 and has a conical shape (conical shape) spreading upward in a sectional view as shown in FIGS. In the locking position of the lock arm 11 as shown in FIG. The engagement ball 12 is, for example, a steel ball, and the upper portion thereof is engaged with an engagement hole 29 formed in the upper surface wall portion 20 of the base 10 and penetrating vertically. The engagement hole 29 is in the shape of a long hole extending in the left-right direction, and the dimension in the front-rear direction, which is the short direction, is substantially equal to the diameter of the engagement ball 12 as shown in FIG.

  On the other hand, an arm holder 14 that slidably supports the release arm 13 is attached to the upper surface wall portion 20 of the base 10. The arm holder 14 is made of, for example, a sheet metal, and is formed in a substantially U shape in a sectional view that opens downward. The arm holder 14 is attached to the upper surface wall portion 20 of the base 10 by screws 15 from above with a flange portion 14a. . The release arm 13, most of which is stored in the arm holder 14, can slide in the arm holder 14 along the horizontal direction and is biased to the left by a coil spring 40. That is, the release arm 13 is configured to slide in the horizontal direction like the lock arm 11, and both are parallel to each other, but are configured to be slidable independently. The release arm 13 is also configured in the same direction as the lock arm 11. It is energized. The release arm 13 is housed in the arm holder 14 and is biased from one end side to the other end side by a coil spring 40, and an operating body 42 provided at the other end of the arm body 41. Consists of The arm main body 41 is formed in a substantially U shape in sectional view that opens to the rear side, and is made of, for example, a sheet metal, and a release engagement recess 43 that opens downward is formed on the lower surface thereof. The engagement recess 43 for release is circular when viewed from the bottom, but has a conical shape in which the vertical direction is opposite to the engagement recess 37 for locking formed on the upper surface of the lock arm 11 and spreads downward. Is formed. As shown in FIG. 7, the release arm 13 is normally pushed by the coil spring 40 and moved to the left side. At this time, the coil spring 40 is contracted to some extent. In this state, the engagement recess 43 for release is located on the left side of the engagement hole 29 of the base 10, and the engagement ball 12 is not engaged with the engagement recess 43 for release. Then, when the release arm 13 moves to the right against the urging force of the coil spring 40 as shown in FIG. 9, the release engagement recess 43 reaches the upper side of the engagement hole 29, and the upper part of the engagement ball 12 is Engage with the engaging recess 43 for release. Since the engaging recess 37 for locking the lock arm 11 has a tapered wall surface, an upward component force acts on the engagement ball 12 by the force with which the lock arm 11 is pressed by the coil spring 26. The engagement ball 12 is shifted upward by the component force, and the upper portion thereof engages with the engagement recess 43 for release.

  The operating body 42 is attached to the left end of the arm body 41 via a support shaft 44. One end portion of the operating body 42 is located inside the arm holder 14, and one corner 42 a is chamfered so that the operating body 42 is horizontally oriented with the support shaft 44 as a fulcrum. It can be rotated or swung slightly. The operating body 42 is urged clockwise by a torsion spring 45 provided on the support shaft 44 in plan view. The other end of the operating body 42 protrudes to the left from the arm body 41 and also protrudes from the arm holder 14. Then, as described later, when the second door 2 is deployed, the other end of the operating body 42 abuts on the first door 1 and is pushed toward the right side, so that the operating body 42 and the arm body 41 are integrated. Then, it moves toward the right side, that is, toward the inside of the arm holder 14, and the upper portion of the engagement ball 12 engages with the engagement recess 43 for release to release the locked state of the lock arm 11. Even after the locking state of the lock arm 11 is released as shown in FIG. 9, since the engagement hole 29 is a long hole, the operating body 42 and the arm main body 41 can move further to the right by the stroke. it can. Further, the step 42b is formed in the operating body 42. If the operating body 42 is pushed to the right side beyond the normal use range for some reason, the step 42b is formed on the end surface of the arm holder 14. It contacts and functions as a stopper, thereby preventing damage to the member that would be caused by being pushed in excessively. In addition, in order to reduce the collision sound with the 1st door 1 and to prevent the damage | injury of the 1st door 1, the action body 42 is preferably formed from a synthetic resin. As described above, in the present embodiment, the arm holder 14, the release arm 13, and the coil spring 40 constitute an unlocking mechanism.

  Next, the operation of the fixing device configured as described above will be described. FIGS. 10 to 12 show schematic views of the operation, and reference numeral C in the drawings is a rotation fulcrum of the second door 2. First, in a state where both doors 1 and 2 are folded, the lock arm 11 is located at the unlock position. FIG. 10 shows a state corresponding to FIG. 13B, in which the first door 1 is in the closed state and the second door 2 is in the folded state. In this state, the lock arm 11 is in the unlocked position. Yes, the operating body 42 protrudes laterally from the base end of the second door 2.

  When the second door 2 is rotated from the folded state toward the closing side, the other end of the operating body 42 eventually comes into contact with the tip of the first door 1 as shown in FIG. Touch. Thereafter, when the operating body 42 receives a pressing force from the first door 1, the release arm 13 moves in the retracting direction into the arm holder 14. When the release arm 13 reaches a predetermined position, the engagement ball 12 is engaged with the engagement recess 43 for release, and the locking state of the lock arm 11 is released. The lock arm 11 is first driven by the biasing force of the coil spring 26. The roller 34 of the lock arm 11 comes into contact with the first door 1 as shown in FIG. When the second door 2 is further rotated from the state of FIG. 11B, the operating body 42 is further pushed by the first door 1, but since the engagement hole 29 is a long hole, the release arm 13 can be moved and retracted by a predetermined amount in the storing direction even after the locked state of the lock arm 11 is released. When the second door 2 is fully closed, the lock arm 11 moves to the lock position while the roller 34 is in contact with the front surface 1a of the first door 1, and the state shown in FIGS. In this state, since the predetermined area of the lock arm 11 is located on the front side of the first door 1 and the doors 1 and 2 are bridged in the horizontal direction, the doors 1 and 2 can be opened integrally.

  When the doors 1 and 2 are folded and stored in the door pocket 6, the knob 33 is gripped as shown in FIGS. 3 and 4 and the lock arm 11 is manually moved to the unlocked position. When the lock arm 11 is moved to the unlocking position, the engagement recess 43 having a tapered wall surface is urged by the coil spring 40, so that the engagement ball 12 is pushed downward by the engagement recess 43 and dropped. The lock arm 11 is latched and held at the unlocked position. Then, when the second door 2 is gradually rotated in the opening direction, the side surface of the operating body 42 abuts against the front surface 1a of the first door 1 as shown in FIG. It rotates counterclockwise in plan view. The point at which the operating body 42 abuts against the front surface 1a of the first door 1 gradually moves to the tip side of the first door 1 as the second door 2 rotates, and eventually FIG. 12 (b). When the actuating body 42 moves away from the front surface 1a of the first door 1 as described above, the actuating body 42 returns to the original basic posture by the urging force of the torsion spring 45 at the same time. The operating body 42 is aligned with the arm body 41 along the sliding direction in the basic posture. Then, the 2nd door 2 will rotate to the front side of the 1st door 1, and will be in the folding state shown in FIG.

  As described above, the fixing device according to the present embodiment can be used by being attached to the second door 2 that is the door on the front end side. Work burden is reduced. Further, since the lock spring 11 is urged toward the lock position by the coil spring 26 and the engagement ball 12 locks the lock arm 11 at the unlock position, the lock arm 11 can be moved with a simple structure. It can be locked together with easy maintenance.

  Further, the spherical engaging ball 12 is used as the locking means, and the wall surface of the locking engagement concave portion 37 is tapered, so that the engagement is performed by the biasing force of the coil spring 26 for biasing the lock arm 11. The ball 12 can be urged toward the unlocking side, that is, the upper side. Since the engagement ball 12 is urged toward the unlocking side at the unlocked position, the locked state is immediately released when the operating body 42 is pushed during the deployment, and at the same time the unlocked state is reached, the lock arm 11 is locked. Can be located. Further, since the biasing force of the coil spring 26 is used to bias the engagement ball 12 toward the unlocking side, a separate member for biasing the engagement ball 12 toward the unlocking side is unnecessary. It is. On the other hand, when the lock arm 11 is manually moved to the unlocking position, the engaging ball 12 moves to the locking side by using the biasing force of the coil spring 40, so that the engaging ball 12 is biased to the locking side. The separate member is also unnecessary.

  Further, when the release arm 13 slidably supported by the arm holder 14 attached to the base 10 moves in contact with the first door 1 during the deployment, the lock arm 11 is locked by the engagement ball 12. Since it is released, the locked state of the lock arm 11 can be automatically released in conjunction with the unfolding operation. Moreover, since the release arm 13 is provided with a separate actuating body 42 and the actuating body 42 can be rotated in the horizontal direction, the actuating body 42 is moved to the first door during the transition from the unfolded state to the folded state. Even if it abuts on the first door 1, it can be pivoted away from the first door 1. Therefore, it is possible to easily return to the folded state without separately adjusting the release arm 13. Further, when returning to the folded state, the actuating body 42 automatically returns to the original basic posture by the torsion spring 45, so that even if the operating body 42 is again in the unfolded state, the release arm 13 can move in the retracted direction. When returning to the tatami state, it is not necessary to readjust the operating body 42 and the like.

  In addition, the roller 34 which is the end of the lock arm 11 in the folded state at all times is in contact with the front surface 2a of the second door 2, but is pressed toward the second door 2 with a large force. Therefore, the roller 34 is less likely to be deteriorated with the passage of time and the durability of the lock arm 11 is higher than when the roller 34 is pressed against the second door 2 or the first door 1 in the same state for a long time. Thus, even in the event of a fire, the rollers 34 can smoothly come into contact with the front surface 1a of the first door 1 and rotate.

  In this embodiment, the release arm 13 includes the operating body 42 that is separate from the arm main body 41, but may be an integrated configuration that does not include the separate operating body 42.

  Further, the locking release mechanism is not limited to the configuration using the release arm 13 and may be released by a rotating member or the like. Similarly, various configurations can be adopted for the biasing means and the locking means.

  Furthermore, various configurations can be adopted for the lock arm 11, and for example, a configuration may be adopted in which a vertical plane parallel to the front surface 2a of the second door 2 rotates or swings around a horizontal axis. Even in the case of sliding movement, it may move in an oblique direction instead of a horizontal direction, and it is preferable to move in parallel with the front surface 2a of the second door 2.

  Moreover, although the structure attached to the 2nd door 2 was demonstrated in the said embodiment, it is good also as a structure attached to the 1st door 1 conversely. Furthermore, although the case of the double fold door which consists of the 1st door 1 and the 2nd door 2 was demonstrated as a foldable door, it is applicable also to the trifold door which consists of a 1st thru | or 3rd door, In that case The first door and the second door may be fixed, the second door and the third door may be fixed, and can be used between two adjacent doors. It can also be applied to folding doors with four or more folds.

DESCRIPTION OF SYMBOLS 1 1st door 1a Front 2 2nd door 2a Front 3 Auto swing hinge 4 Auto swing hinge 5 Door frame 6 Door bag 7 Release 10 Base 11 Lock arm 11a End part 12 Engagement ball (locking means)
13 Release arm 14 Arm holder 14a Flange portion 15 Screw 20 Upper surface wall portion 21 Side wall portion 22 Lower surface wall portion 23 Screw 24 Guide roller 24a Support shaft 25 Spring pressing portion 26 Coil spring (biasing means)
27 Spring guide 28 Buffer material 29 Engagement hole 30 Upper surface wall portion 31 Side wall portion 32 Lower surface wall portion 33 Knob piece 34 Roller 34a Support shaft 35 Spring pressing portion 36 Spring holder 37 Engaging recess 40 for locking Coil spring 41 Arm body 42 Actuating body 42a Corner portion 42b Stepped portion 43 Engaging recess 44 for release 44 Support shaft 45 Torsion spring C Rotating fulcrum of second door

Claims (4)

Folded from the folded state so that the front side door and the front side of the front door face each other are turned to the closed side so that the front side door is separated from the proximal side door. A folding door deployment state fixing device that is attached to the door and is capable of opening and closing the doors in an unfolded state.
The door is attached to one of the doors, and a predetermined area projects from one door side to the other door side and is located on the front side of the other door, and the predetermined area is on one door side. A lock arm that is movable between the unlocking position to be retracted,
An arm position control mechanism that is attached to one door side, holds the lock arm in the unlocked position in the folded state of both doors, and moves the lock arm to the locked position when both doors are in the deployed state;
A folding state fixing device for a foldable door, characterized in that both doors are fixed in a deployed state by a lock arm located at a locked position.   The lock arm is configured to be slidable from one door side to the other door side, and the lock arm is slid so as to protrude from the one door side to the other door side to be in the locked position. Foldable door deployment state fixing device.   The arm position control mechanism includes a biasing unit that biases the lock arm toward the lock position, a latching unit that latches the lock arm in the unlocked position against the biasing force of the biasing unit, and the latch The folding state fixing device for a foldable door according to claim 2, further comprising a locking release mechanism that releases the locking state of the lock arm by the means.   The lock release mechanism has a release arm that can be moved independently of the lock arm, and can be attached to the front end side during the period from the folded state to the unfolded state. The foldable door according to claim 3, wherein the release arm is configured to release the locked state by the locking means when the release arm abuts against the door on the proximal end side and is moved by being pressed in accordance with the rotation of the door. Expanded state fixing device.

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