JP2010037745A - Sliding door self-closing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sliding door self-closing device which immediately and surely eliminates a sag in a cord-like wire rod on the occurrence of the sag, without restrictions on the type and structure of a sliding door for undergoing application. <P>SOLUTION: In this sliding door self-closing device A, a reel 30 for winding the cord-like wire rod 29, and a spiral spring 35 for rotatively urging the reel in the direction Z of winding the cord-like wire rod are assembled to a component mounting means 25, so as to form a spring unit P. In the state of pulling out the cord-like wire rod and locking a leading end to a jamb 10, the spring unit is slidably engaged with a guide rail 55 of a guide member G fixed to an upper end of the sliding door D. One end of a sag eliminating spring S having a spring urging force weaker than a rotational urging force for winding the cord-like wire rod, exerted by the spiral spring 35 is latched to the guide member, and the other end of the sag eliminating spring is latched to the spring unit, so as to constantly urge the spring unit in the direction of opening the sliding door. In the self-closing of the sliding door, when the sag occurs in the cord-like wire rod for being wound around the reel, the sag is eliminated by sliding the spring unit in the direction of opening the sliding door. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention pulls the sliding door by hand in the opening direction and slides it to the open position in the middle, and then pulls the sliding door with a string-like wire such as a wire and automatically slides in the closing direction when the hand is released from the sliding door. The present invention relates to a sliding door self-closing device.

  Conventionally, this kind of sliding door self-closing device is such that a wire reel in which a wire is wound around an outer pulley portion is rotatably supported by a pivot, and the wire reel has one end of a spiral spring (spring) incorporated in the pulley portion. Is applied to the pivot and the other end is locked to the pulley portion to constantly apply a biasing force that rotates in the winding direction of the wire, and the drive rotary gear is connected to one end of the pivot while the rotary drive is driven by the rotary damper. The device body is configured by meshing the rotation gear, and the device body is assembled to a support such as a door frame for hanging the sliding door, for example, while the wire is pulled out from the wire reel and the tip is hooked on the sliding door side. Yes.

  Therefore, in the conventional sliding door self-closing device, when the sliding door is pulled by hand in the opening direction, the wire is pulled out against the spiral spring, and the sliding door opens by sliding to the open position, while the hand is opened from the sliding door in the middle of opening. When released, the wire is wound by the rotational biasing force of the spiral spring, the sliding door is pulled by the winding force, and is slid in the closing direction to self-close. Also, when the rotation in the direction of winding the wire is transmitted to the rotor in the rotary damper through the meshing of the drive rotation gear and the driven rotation gear during self-closing, a braking torque is generated in the rotary damper and the wire reel is braked. The sliding door is designed to slowly close itself while decelerating (see Patent Document 1).

  However, in the conventional sliding door self-closing device, when the sliding door is forcibly pulled in the closing direction by a force strong enough to overcome the rotational biasing force of the spiral spring and the braking force of the rotary damper during the self-closing, The wire cannot be wound up following the movement, and as a result, slack may occur on the wire drawing side. Then, there was a problem that various inconvenient situations occurred due to the slack of the wire, such as mischief using the slack of the wire.

  Therefore, the applicant has newly proposed a sliding door self-closing device that removes the slack when a slack occurs in the wire during self-closing. This sliding door self-closing device includes a wire reel that winds a wire, a spiral spring that urges the wire reel to rotate in the winding direction of the wire, and a rotary that decelerates the rotation of the wire reel when self-closed and applies a braking force to the sliding door. A damper is attached to the mainspring case to assemble the weight unit, and a guide hole for inserting the weight unit is drilled downward from the upper end surface of the sliding door, while the wire is pulled out from the wire reel and the tip is hooked on the sliding door rail. Thus, the weight unit is suspended and housed in a guide hole so that it can be lifted and lowered (the weight unit sets the gravity acting thereon smaller than the rotational biasing force of the spiral spring).

Therefore, in this conventional sliding door self-closing device, when the sliding door is forcibly pulled in the closing direction with a strong force against the rotational biasing force of the spiral spring or the braking force of the rotary damper during the self-closing, The wire cannot be taken up following the movement, and the wire pulls out, but the weight unit descends in the depth direction of the guide hole by the length of the wire slack that has just occurred. Then, the slack is removed by immediately returning the wire to the original tension state.
JP 2000-130004 A

  However, in the conventional slack eliminating type sliding door self-closing device, when the wire slacks, the weight unit descends to take loose by gravity, but considering the appearance around the sliding door, the weight unit is drilled in the sliding door It is built in a suspended state that can be raised and lowered in the guide hole. Therefore, the conventional slack eliminating type sliding door self-closing device cannot be applied to a thin sliding door, a sliding door made of glass or metal, a sliding door with a window, or the like, in which the guide hole as described above cannot be drilled. There was a problem that there were restrictions on the types and structures of sliding doors.

  The object of the present invention is to provide a sliding door self-closing device that removes the slack immediately and reliably when slack is generated in a string-like wire material such as a wire without being restricted by the kind and structure of the sliding door to be applied as described above. It is to provide.

  Therefore, in order to achieve the above-described object of the present invention, the invention according to claim 1 is slid to the open position in the middle by pulling the sliding door D by hand in the opening direction X as shown in the embodiment shown below. After moving the sliding door D, when the hand is released from the sliding door D, the sliding door D is pulled by the string-like wire 29 and slid in the closing direction Y so as to self-close. A mainspring unit P is formed by assembling the reel 30 that is mounted and pivotally supported, and a spiral spring 35 that rotationally biases the reel 30 in the winding direction Z of the string-like wire 29 to the component mounting means 25. The mainspring unit P is engaged with the upper end of the sliding door D in a state where the string-like wire 29 is pulled out from the reel 30 and the front end is locked to the supporting body of the sliding door D such as the vertical frame 10 on the door tip side. The sliding door D is slidably guided in the opening and closing directions X and Y. The guide member G is fixed, one end of the slack eliminating spring S having a spring urging force weaker than the urging force for winding the cord-like wire rod 29 of the spiral spring 35 is fixed to the guide member G, and the other end is fixed to the spring. When the mainspring unit is always biased in the opening direction X of the sliding door D by being hooked on the unit P, and the string-like wire rod 29 wound around the reel 30 is loosened when the sliding door is self-closed, The unit P is slid in the opening direction X of the sliding door D to remove slack.

  The invention according to claim 2 is the sliding door self-closing device A according to claim 1, for example, as shown in the embodiment shown below, the mainspring unit P is placed on the guide member G in the opening / closing direction of the sliding door D. While the guide rail 55 for guiding to X and Y is provided, the component mounting means 25 is provided with a mounting case 27 for housing the reel and the spiral spring 35, and the mounting case 27 engages with the guide rail 55. A groove 34 is provided.

  According to the first aspect of the present invention, when the sliding door is once opened and then forcibly pulled in the closing direction by a strong force against the rotational biasing force of the spiral spring, it follows the sudden movement of the sliding door. The string-like wire cannot be wound around the reel, and the string-like wire is loosened momentarily, but since the string-like wire is in a slack state at that moment, the spring biasing force of the spiral spring does not work, Although the spring urging force is weaker than the spiral spring, the spring urging force of the slack eliminating spring works and slides the mainspring unit in the opening direction with the guide member guide, and immediately returns the string-like wire to its original tension state to loosen it. It can be removed reliably.

  In addition, the invention according to claim 1 does not lower the weight unit and remove the slack by gravity when the slack is generated in the string-like wire, but the spring unit is connected to the spring unit by the spring biasing force of the slack-removing spring. Since the sliding door is made to slide in the opening direction and the slack is removed, the sliding door to be applied is made of wooden material that can drill a guide hole that covers the weight unit considering the appearance around the sliding door as in the past. It is not necessary to be meat, it can be a thin sliding door, a sliding door made of glass or metal, or a structure with a special window, etc. Can be applied.

  According to the invention of claim 2, when the mainspring unit is slid, the mainspring unit is guided in the opening / closing direction of the sliding door by the guide rail of the guide member engaged with the guide groove, and smoothly without rattling. Can be slid.

  Hereinafter, the best mode of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view showing a sliding door structure provided with a sliding door self-closing device according to an example of the present invention in an opened state, FIG. 2 is an exploded perspective view of a main part of the sliding door structure, and FIG. 3 is an upper part of the sliding door structure. It is a longitudinal cross-sectional view of the side.

  The sliding door structure in the illustrated example is installed, for example, at the entrance of a hospital room, and includes a door frame F, a door pocket wall W, a sliding door D, and a slide rail L that slides the sliding door D in the opening / closing directions X and Y. The door frame F is a magnetic metal rectangular frame, and includes vertical frames 10 and 11 erected on the left and right of the sliding door D in the opening and closing direction, and an upper frame 12 on the ceiling side. The door pocket wall W stands upright with an opening C between it and the door-end side vertical frame 10, and a guide roller 13 that prevents the sliding door D from sideways swinging at the time of opening and closing is pivoted on the lower wall surface on the front side in FIG. It is supported and protrudes upward.

  The illustrated sliding door D is made of a relatively heavy glass and has a horizontally long rectangular plate shape, and a pair of U-shaped rail mounting bodies 15 and 16 are fixed on the upper end surface 14 near the door tip and the door bottom with bolts. Set up. On the other hand, a guide groove 17 that engages with the guide roller 13 for preventing side shake on the door pocket wall W side when being suspended is provided in the lower end surface in the length direction. The sliding door D is provided with a bar handle 18 in the vertical direction on the door end side. The sliding door D to which the present invention is applied is of a special structure such as a door, such as a wooden plate, a resin, a metal, etc. May be.

  The slide rail L is made of metal and includes an outer rail 19, an inner rail 20, and a ball retainer 21, as shown in FIG. The outer rail 19 is formed by bending both side edges of a flat mounting plate portion 19a inward facing each other to form a ball guide portion 19b. The inner rail 20 is a length size obtained by subtracting a predetermined opening / closing stroke distance from the length of the outer rail 19, and both side edges of the mounting portion 20a bent in a substantially U-shaped cross section at the center are curved outwardly away from each other. The ball guide portion 20b is formed. The retainer 21 has a large number of support piece portions 21b bent in a U-shape on a parallel retainer main body portion 21a, and a holding hole is formed in each of the support piece portions 21b, and each of the holding holes has a small metal diameter. The ball 22 is fitted and held so as to roll freely.

  The slide rail L fits the retainer 21 to the outer rail 19 by engaging the retained ball 22 with the left and right ball guide portions 19b, and then inserts the inner rail 20 into the left and right ball guide portions 20b into the ball 22. And is inserted into the retainer 21, and is slidably fitted to the outer rail 19 via the retainer 21 for assembly. When the inner rail 20 is slid, the balls 22 roll between the rails 19 and 20 and are pushed by the balls 22 so that the retainer 21 is approximately half the predetermined stroke with respect to the outer rail 19. Simultaneously with the movement, the inner rail 20 is set to move relative to the outer rail 19 by a predetermined stroke.

  Therefore, in the sliding door structure, the slide rail L is laid sideways, and the catch plate portion 20a of the inner rail 20 is attached to the upper flange portions 15a and 16a of the rail mounting bodies 15 and 16 on the sliding door D with bolts 23. On the other hand, the mounting plate 19a of the outer rail 19 is fixed to the upper frame 12 with screws 24, and the sliding door D is suspended from the upper frame 12 through the slide rail L so as to be slidable in the opening / closing directions X and Y. (See FIG. 7). 3 and 7, reference numeral 36 denotes a decorative curtain that covers the space between the suspended door D and the upper frame 12.

  Therefore, in the sliding door structure, when the bar handle 18 shown in FIG. 1 is held by hand, the sliding door D is pulled in the opening direction X and slid to the open position, and then released in the middle of opening, the sliding door of the present invention. The self-closing device A is activated, and the sliding door D is automatically slid in the closing direction Y by the slide rail L from the halfway open position to close the opening C.

  As shown in FIG. 4, the sliding door self-closing device A includes a mainspring unit P, a guide member G, a slack eliminating spring S for the string-like wire 29, and an air brake B. In the illustrated example, a resin wire is used as the string-like wire 29, but the string-like wire in the present invention is a string that can be wound around the reel 30 and can be used as a pulling material for the sliding door D. For example, it may be a metal wire, and is not limited to wires, but includes various strings, ropes, cables, cords, and the like.

  As shown in FIG. 5, the mainspring unit P includes a component mounting means 25, a reel 30 that winds the wire rod 29, a spiral spring 35 that urges the reel 30 to rotate, and a rotary damper that decelerates the rotation of the reel 30. 40.

  The component attachment means 25 includes an attachment frame 26 and an attachment case 27. The mounting frame 26 is composed of a rectangular window plate portion 26a having a circular window 28 and a long arm portion 26c having a spring flange portion 26b on the upper edge side in FIG. 5, and a stud at the tip of the arm portion 26c. 37 is inserted and protruded sideways. On the other hand, as shown in FIG. 6, the attachment case 27 includes a case main body 31 and a rectangular plate-like lid plate 32. The case main body 31 has a slightly flat and substantially rectangular storage box portion 31a and a damper mounting plate portion 31b extending in a plate shape from the storage box portion 31a, and covers the storage box portion 31a with a cover plate 32 to form a box shape. assemble. In the storage box portion 31a, a through hole 33 for the string-like wire 29 is provided in the front plate portion 31c opposite to the damper mounting plate portion 31b, and a thin guide groove 34 is provided in the side plate portion 31d facing each other along the length direction. It becomes.

  The reel 30 has a ring-shaped pulley part 30a and a drive gear part 30b on the same axis, and a string-like wire 29 is wound around the outer periphery of the pulley part 30a, while a spiral spring 35 is housed inside the pulley part 30a. The rotation is pivotally supported by an adjustment shaft 39 at the center of rotation, and is housed in the storage box portion 31a. And the front end side is drawn out from the pulley part 30a around which the string-like wire 29 is wound, and pulled out from the through hole 33 to the outside.

  One end of the spiral spring 35 is hooked on an adjustment shaft 39 that adjusts the spring force, the other end is hooked on the reel 30, and the urging force for rotating the reel 30 in the direction Z in which the string-like wire 29 is wound is always applied. Has been granted. As shown in FIG. 5, the drive gear portion 30b is pivoted by the adjusting shaft 39 coaxially with the reel 30 with the outer peripheral teeth facing the outside from the opening 38 opened on the opposite side to the front plate portion 31c. Support.

  As shown in FIG. 6, the rotary damper 40 includes a cylinder 43 having a pair of mounting protrusions 43 a on the outer peripheral surface, and a rotor (not shown) housed in the cylinder 43 so as to be rotatable about the rotor shaft 44. The gap between the outer periphery of the rotor and the inner periphery of the barrel 43 is filled with viscous oil and sealed in the barrel 43, and when the rotor rotates, a braking torque is generated by the viscous resistance of the oil. Yes. Further, the rotary damper 40 connects the driven rotation gear 45 to the tip shaft portion 44 a of the rotor shaft 44 so as to be integrally rotatable with the rotor via the one-way clutch 46, and the driven rotation gear 45 winds the string-like wire 29. It is structured to generate braking torque when it rotates in one direction.

  Therefore, as shown in FIG. 5, the mainspring unit P secures the mounting protrusion 43a to the damper mounting plate portion 31b with the driven rotation gear 45 of the rotary damper 40 engaged with the drive gear portion 30b of the reel 30. After the rotary damper 40 is assembled to the mounting case 27, the case body 31 is covered with the cover plate 32 and screwed, and the reel 30, the spiral spring 35, and the rotary damper 40 are incorporated into the mounting case 27 and integrated. To do. Further, the window plate portion 26a is overlapped on the plate surface of the case main body 31 on the damper mounting plate portion 31b side, the mounting frame 26 is screwed to the mounting case 27, and as shown in FIG. It is assembled as a single mainspring unit P with 39a facing the outside from the circular window 28. In the mounting case 27, a plate-shaped buffer mat 48 is attached to the front plate portion 31c in which the through-hole 33 of the string-like wire 29 is opened.

  The guide member G includes a support plate 49 and a guide case 50. The support plate 49 is a horizontally long and long metal plate in FIG. 4, and the lower edge side of the intermediate long plate portion 49a is partially bent forward to form a spring flange portion 49b. The length of the intermediate plate portion 49a is On one side in the vertical direction (left side in FIG. 4), a fixed arm portion 49c is formed by bending slightly toward the front in the drawing in accordance with the rail mounting body 15 on the sliding door D, while the other side (right side in FIG. 4). On the contrary, the support plate portion 49d is formed by bending inward in FIG. Further, an L plate piece-like stopper 51 is screwed near the support plate portion 49d of the intermediate plate portion 49a, and a stud 52 is fitted on the lower side of the stopper 51 to project laterally.

  The guide case 50 is formed by bending a metal plate into a channel shape having a U-shaped cross section, and the opposing bent plate portions 50a and 50a are respectively formed in a rib shape elongated in the length direction so as to correspond to the guide groove 34 of the mainspring unit P. The guide block 55 is provided, and an end block 57 having a urethane cushion mat 56 fixed to one end portion of the main body plate portion 50b is screwed inwardly on the buffer mat 56 side. Therefore, the guide member G is assembled by fixing the guide case 50 to the support plate portion 49d of the support plate 49 with screws.

  The slack eliminating spring S is a tension coil spring in the illustrated example, and is configured to set the tension spring biasing force smaller than the biasing force for winding the string-like wire 29 of the spiral spring 35.

  The air brake B is an air brake that applies a braking force by the compressed air generated at the time when a piston arranged so as to be capable of linear reciprocation is pushed into the cylinder 58. The air brake B is a piston rod 59 that protrudes from the cylinder 58. The abutting board 60 is fixed to the tip, and a magnet 60 a is attached to the front surface of the abutting board 60.

  Therefore, the sliding door self-closing device A assembles the air brake B, the mainspring unit P, and the slack eliminating spring S to the guide member G. The mainspring unit P is engaged with the guide groove 55 in the guide groove 34 and attached to the guide case 50 so as to be slidable linearly, and the hook 61 provided at one end of the slack eliminating spring S is hooked on the stud 37 of the mounting frame 26. . As shown in FIG. 7, the slack eliminating spring S is in a biased state in which the hook 62 provided at the other end is hooked on the stud 52 protruding from the guide member G and the mainspring unit P is pulled toward the end block 57. P is connected to the guide member G. As shown in FIG. 4, the air brake B is screwed through a holder 63 along the longitudinal direction of the intermediate plate portion 49a and the fixed arm portion 49c with the abutting disc 60 facing the opposite side of the mainspring unit P. As shown in FIG. 2, the sliding door self-closing device A is assembled.

  Now, the sliding door self-closing device A assembled in this way overlaps the fixed arm portion 49c of the guide member G with the rail attachment body 15 on the door end side, and then, as shown in FIG. Is fixed to the rail attachment body 15 and mounted on the upper end surface 14 of the sliding door D. At that time, the sliding door D is pulled in the closing direction on the door-end side, and as shown in FIG. While attracted to the side vertical frame 10 and held in a fully closed state, as shown in FIG. 9, the string-like wire 29 is pulled out from the reel 30 against the rotational biasing force of the spiral spring 35, and the hook 29a at the tip is pulled out. As shown in FIG. 8, it is hooked on a locking tool 65 attached to the door-end side vertical frame 10. Then, the rotational urging force in the winding direction Z by the spiral spring 35 acts, and the sliding door D is pulled in the closing direction Y and is suspended in the door frame F in the fully closed state. At this time, the sliding door self-closing device A causes the spring unit P to be drawn in the closing direction Y as shown in FIGS. 8 and 9 by the rotational biasing force in the winding direction Z by the spiral spring 35 via the buffer mat 48. The guide member G is stopped against the stopper 51, held in the guide case 50, positioned and held, and the string-like wire 29 is held in a stretched state.

  Therefore, when the sliding door self-closing device A slides the sliding door D, which is now fully closed, holding the bar handle 18 in the opening direction X and sliding it, as shown in FIG. When the piston rod 59 of B is pulled out from the cylinder 58 and the piston 66 hits the outlet step 58a of the cylinder 58 and the piston rod 59 is in the longest protruding state, the sliding door D is further pulled in the opening direction X, as shown in FIG. As described above, the abutting disc 60 of the piston rod 59 is peeled off from the door end side vertical frame 10, and the string-like wire 29 is fed out from the reel 30 against the rotational biasing force of the spiral spring 35, and the sliding door D is opened. Slide in direction X to open opening C.

  On the other hand, if the hand is released from the bar handle 18 in the middle of opening, the rotational urging force in the winding direction Z by the spiral spring 35 acts, and with this rotational urging force, the string-like wire 29 is wound around the reel 30 and this winding force Then, the sliding door D is pulled and slid in the closing direction Y from the halfway open position, and the opening C is self-closed. At the time of this self-closing, in the sliding door self-closing device A, the rotation in the direction Z in which the string-like wire 29 is wound is transmitted to the rotor in the rotary damper 40 through the meshing of the drive gear portion 30b of the reel 30 and the driven rotation gear 45. As a result, a braking torque is generated in the rotary damper 40, and the reel 30 rotates in a loaded state with a brake applied. Accordingly, the sliding door D slowly closes in the closing direction Y while decreasing the sliding speed.

  Thereafter, in the sliding door self-closing device A, when the sliding door D slides while reducing the self-closing speed and approaches the fully closed position, as shown in FIG. 10, the abutting disc of the piston rod 59 in the longest protruding state is obtained. When 60 hits the door-end side vertical frame 10, the abutment board 60 is pushed by the door-end side vertical frame 10, and the piston 66 is gradually pushed deeply into the cylinder 58. The braking force is applied by the air compressed at that time. As a result, immediately before the door is fully closed, the sliding door D slides more slowly while the braking force of the air brake B acts in addition to the rotary damper 40 and decelerates under a load with a strong brake. However, it is fully closed as shown in FIG. Therefore, it is possible to reliably prevent the sliding door D from being suddenly closed and injured by putting a finger or a hand between the sliding door D and the vertical frame 10.

  By the way, in the sliding door self-closing device A, after the sliding door D is once opened, the sliding door D is closed with a strong force against the rotational biasing force of the spiral spring 35 and the braking force of the rotary damper 40 as shown in FIG. When pulled forcibly in the direction Y, the string-like wire 29 cannot be wound around the reel 30 following the sudden movement of the sliding door D, and as shown in FIG. A slack is generated on the 29 drawer side. However, in the sliding door self-closing device A, since the string-like wire 29 is in a slack state at that moment, the spring biasing force of the spiral spring 35 does not work, but it is weaker than the spiral spring 35, but is shown in FIG. Thus, the spring urging force of the slack eliminating spring S works to pull the mainspring unit P, and slides in the opening direction X with the guide of the guide case 50 by the length of the slack of the string-like wire 19 that has just occurred. As shown, the string-like wire 29 is immediately returned to the original tension state to remove the slack. Therefore, the sliding door self-closing device A, when the string-like wire 29 is not loosened, the rotational urging force of the spiral spring 35 acts again, winds the string-like wire 29 around the reel 30 and pulls the sliding door D in the closing direction Y. While slowly sliding to the fully closed position, it closes normally.

  As shown in FIG. 12, when the sliding door self-closing device A generates slack in the string-like wire 29, the spring unit P is pulled by the slack-removing spring S in the opening direction X according to the length of the slack of the string-like wire 29. When sliding, the mainspring unit P is guided in the opening / closing directions X and Y by the guide member G by the guide rail 55 on the guide member G side engaged with the guide groove 34 on the mainspring unit P side, and smooth without rattling. Can be slid.

  In the illustrated embodiment described above, an example is shown in which the present invention is applied to a slide rail type sliding door D that is slidably suspended on a door frame F using a slide rail L. However, the present invention is similarly applied to a door cart. Of course, the present invention can also be applied to a door sliding door that is slidably slidable in the opening and closing direction.

  In the above-described embodiment, when the string-like wire 29 is loosened when the sliding door D is closed, the cord-like wire 29 is loosened by pulling the spring unit P with the slack-removing spring S and sliding it in the opening direction X. However, the present invention can also be configured to remove the slack of the string-like wire by pressing the mainspring unit with the slack eliminating spring and sliding it in the opening direction.

It is a front view which shows the sliding door structure which attached the sliding door self-closing apparatus of this invention in the open state of a sliding door. It is a disassembled perspective view of the principal part of a sliding door structure. It is a longitudinal cross-sectional view in the air brake position of a sliding door structure. It is a disassembled perspective view of a sliding door self-closing apparatus. It is an assembly perspective view of a mainspring unit. It is a disassembled perspective view of the principal part of a mainspring unit. It is a longitudinal cross-sectional view in the mainspring unit position of a sliding door structure. It is a front view which shows a sliding door structure in the fully-closed state of a sliding door. It is an assembly perspective view of the principal part of a sliding door self-closing device. It is a front view which shows a sliding door structure in the state in which the sliding door is in the middle of opening and closing. It is a front view which shows a sliding door structure in the slack state of a string-like wire. It is a perspective view which shows a sliding door self-closing apparatus in (A) slack state of a string-like wire, and (B) slack cancellation state. It is a front view which shows a sliding door structure in a slack removal state.

Explanation of symbols

A Sliding door self-closing device D Sliding door G Guide member L Slide rail P Spring unit S Slack-removing spring X Opening direction Y Closing direction 10/11 Vertical frame 25 Component mounting means 26 Mounting frame 27 Mounting case 29 String wire 30 Reel 35 Spiral spring 34 Guide groove 55 Guide rail

Claims (2)

Pulling the sliding door by hand in the opening direction and sliding it to the open position in the middle, then releasing the hand from the sliding door, pulling the sliding door with a string-like wire, sliding in the closing direction and self-closing In the apparatus, a spiral spring is formed by assembling a reel that is wound around the wire rod and rotatably supported, and a spiral spring that urges the reel to rotate in the winding direction of the wire. And
With the upper end of the sliding door, the cord-like wire rod is pulled out from the reel in the closing direction of the sliding door and the front end is locked to the support of the sliding door, and the mainspring unit is engaged in the opening / closing direction of the sliding door. The guide member that guides slidably is fixed,
One end of a slack eliminating spring having a spring urging force weaker than the urging force for winding the string-like wire rod of the spiral spring is hooked on the guide member, and the other end is hooked on the mainspring unit, and the mainspring unit is attached to the sliding door. When slack is generated in the string-like wire wound around the reel when the sliding door is self-closed, the spring unit is slid in the opening direction of the sliding door to remove the slack. A sliding door self-closing device.   The guide member is provided with a guide rail for guiding the mainspring unit in the opening / closing direction of the sliding door, and the component mounting means is provided with a mounting case for housing the reel and the spiral spring, and the guide rail includes the guide rail. The sliding door self-closing device according to claim 1, further comprising a guide groove that engages with the sliding door.

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