JP5247362B2 - Overhead door - Google Patents

Description

  The present invention relates to an overhead door that raises and lowers a shutter curtain via a cable member such as a wire to open and close an opening.

  In an opening / closing device, for example, an overhead door, a shutter curtain is configured by flexibly connecting a required number of panels, and a flexible cable member, such as a wire, is attached to the shutter curtain, and the wire is wound or wound. By extending the shutter curtain, the shutter curtain is raised and lowered to open and close the opening.

  First, an outline of the overhead door will be described with reference to FIG.

  The overhead door includes a shutter curtain in which a plurality of panels are connected so as to be bendable, and the shutter curtain is configured to move up and down along the guide rail.

  A vertical guide rail 3 is provided along both side pillars 2 of the opening 1 such as a building, a horizontal guide rail 4 is provided along the ceiling, and the vertical guide rail 3 and the horizontal guide rail 4 are curved rails 5. Are connected by An opening / closing device 7 having a horizontal take-up shaft 6 is provided above the vertical guide rail 3.

  A shutter curtain 8 is slidable along the vertical guide rail 3, the curved rail 5, and the horizontal guide rail 4, and the shutter curtain 8 is configured by a required number of panels 9 being flexibly connected. Yes.

  The take-up shaft 6 is rotatably provided on the side column 2 or the building frame via a bracket 14 and is rotated by a driving device such as an opening / closing motor (not shown). Drums 11 are provided at both ends of the winding shaft 6, and wires 12 wound around the drum 11 are respectively engaged with both width end portions of the lower end portion of the shutter curtain 8. The take-up shaft 6 is provided with a balance spring 13, and the balance spring 13 urges the shutter curtain 8 in the upward direction via the wire 12.

  When the opening 1 is opened, the winding shaft 6 is rotated by an opening / closing motor (not shown), and the drum 11 is further rotated through the winding shaft 6 so that the wire 12 is wound. A shutter curtain 8 is pulled up along the vertical guide rail 3 and further stored in the horizontal guide rail 4.

  When the opening 1 is closed, the drum 11 is rotated in the reverse direction via the winding shaft 6 by an unillustrated opening / closing motor, the wire 12 is fed out, and the shutter curtain 8 is lowered, The opening 1 is closed.

  A torsion coil spring is used as the balance spring 13, and one end of the balance spring 13 is fixed to the bracket 14 side while the balance spring 13 is rotated by a predetermined amount and an initial torque is applied. It is fixed to the take shaft 6 side. Accordingly, the winding shaft 6 is biased with a rotational force in the direction of winding the wire 12. Ascending force is urged to the shutter curtain 8 via the wire 12, and the power when opening and closing the shutter curtain 8 is reduced.

  In the above overhead door, when the wire 12 is cut, or when the tension applied to the wire 12 is reduced due to fatigue of the balance spring 13, the shutter curtain 8 may fall due to its own weight. .

  Therefore, a shutter curtain fall prevention device is conventionally provided as a safety device for preventing the shutter curtain 8 from falling freely.

  As an overhead door provided with a fall prevention device, there is one disclosed in Patent Document 1.

  This will be briefly described with reference to FIGS. 7 (A) and 7 (B). 7A and 7B are views of the fall prevention device 16 as viewed from the side surface direction of the shutter curtain 8. In the figure, reference numeral 3 denotes a vertical guide rail.

  A bracket 17 is attached to the lowermost panel 9 (not shown), and a braking tooth holding body 19 is rotatably attached to the bracket 17 via a horizontal rotation support shaft 18. The braking tooth holding body 19 is supported by a spring (not shown). It is urged so as to rotate counterclockwise in the figure (direction approaching the vertical guide rail 3).

  A braking tooth 21 is fixed to the braking tooth holding body 19 and a wire fixing arm 22 protruding downward is fixed. A wire guide member 23 is swingable through a pin 24 adjacent to the wire fixing arm 22. Is provided.

  The wire guide member 23 is constituted by a pair of plates facing each other with a required gap, and a plurality of wire guide pins 25 are arranged between the plates so as to form a required curved surface at a predetermined pitch. Further, a detachment prevention pin 26 is provided opposite to the wire guide pin 25.

  The wire 12 passes through the inside of the wire guide member 23 and passes between the wire guide pin 25 and the locking pin 26 and is engaged with the wire fixing arm 22.

  When the tension T acts on the wire 12, for example, when the tension T acts in the vertical direction as shown in the figure, the wire 12 passes through the wire guide member 23, so that the moment radius R with respect to the rotation support shaft 18 is achieved. And a clockwise rotational force of M = TR acts on the brake tooth holding body 19. By making the rotational force M larger than the rotational force of the spring, the braking teeth 21 are held away from the vertical guide rail 3.

  When the lowermost panel 9 passes through the curved rail 5, the direction of the tension of the wire 12 changes, but the wire guide member 23 tilts following the direction of the wire 12, and the wire 12 acts to apply a stable tension to the brake tooth holding body 19.

  Next, when the wire 12 is broken, when the tension to the braking tooth holding body 19 is lost, the braking tooth holding body 19 is rotated counterclockwise by the biasing force of the spring, and the braking tooth 21 is moved to the vertical guide. It abuts on the rail 3 and further bites in to prevent the shutter curtain 8 from falling.

  In the conventional fall prevention device 16, the wire guide member 23 is provided for guiding the wire 12, and the tension of the wire 12 always acts on the wire guide member 23, and the shutter curtain 8. It swings every time it opens and closes. Therefore, the wire guide member 23 is required to have durability.

  FIG. 8 shows a fall prevention device disclosed in Patent Document 2. The fall prevention device is rotatable on the braking tooth holding body 19 via a shaft 27 at a position different from the rotation center of the braking tooth holding body 19. A movable plate 28 is provided, the wire 12 is engaged with the movable plate 28, and a tension acts on the wire 12, so that the brake tooth holding body 19 is separated from the brake plate 19 via the movable plate 28. Further, even when the direction of the tension changes, the movable plate 28 rotates to change the point of action of the wire 12 with respect to the braking tooth holding body 19, and the braking tooth holding body 19. The direction of the rotational force M to be applied is not changed.

  Even in the fall prevention device disclosed in Patent Document 2, since the wire 12 is connected to the fall prevention device via the movable plate 28, the opening / closing force of the shutter curtain 8 is shuttered via the movable plate 28. Further, the movable plate 28 is transmitted to the curtain 8 and is frequently rotated as the shutter curtain 8 is opened and closed. Therefore, the movable plate 28 must be manufactured in consideration of durability.

  Therefore, even in the fall prevention device of Patent Document 2, the number of parts is increased, the structure is complicated, and there are manufacturing restrictions such as considering durability.

JP 2007-211411 A

JP 2006-152689 A

  In view of such circumstances, the present invention provides an overhead door in which the wire guide member is omitted, the number of components is reduced, and durability can be further improved.

  The present invention relates to a shutter curtain that can be moved up and down along a guide rail, a cable member engaged with a lower end portion of the shutter curtain, an opening / closing device for moving the shutter curtain up and down via the cable member, and the shutter curtain A fall prevention device provided at a lower end of the shutter curtain, to which the cord material is engaged, and the fall prevention device includes a braking tooth holding body rotatably provided at a lower end portion of the shutter curtain, and the braking tooth holding device. A brake tooth provided on the body, a spring provided to rotate the brake tooth holding body in the direction of the guide rail, and a rope guide member provided at a lower end portion of the shutter curtain, An overhead is constructed in such a way that a material is hooked on the cable guide member and engaged with the brake tooth holder, and the brake tooth holder is separated from the guide rail by applying tension to the rope. Relates to Dodoa, also the rope material guide member has a substantially half-moon shape lower side has an arc shape, the arc of circumference which relates to overhead doors the rope material fits groove is formed.

  According to the present invention, a shutter curtain that can be moved up and down along the guide rail, a cable member engaged with a lower end portion of the shutter curtain, an opening / closing device for moving the shutter curtain up and down through the cable member, A fall prevention device is provided at a lower end of the shutter curtain and to which the cord material is attached. The fall prevention device includes a braking tooth holding body rotatably provided at a lower end portion of the shutter curtain, and the braking device. A braking tooth provided on the tooth holding body, a spring provided to rotate the braking tooth holding body in the direction of the guide rail, and a rope guide member provided on a lower end portion of the shutter curtain, The cord material is hung on the cord material guide member and engaged with the braking tooth holding body, and the braking tooth holding body is separated from the guide rail by applying tension to the cord material. In the fall prevention device, the wire guide member for guiding the wire is fixed, the wire guide portion has no rotating portion, and the wire and the wire guide member are not worn. Can prevent falling and prolong the service life.

  According to the present invention, the rope guide member has a substantially half-moon shape having an arc shape on the lower side, and a groove into which the rope material is fitted is formed on the circumferential surface of the arc. There is no moving part and there is no friction with the wire.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  1 to 5, an overhead door equipped with a fall prevention device according to the present invention will be described. In the figure, the same components as those shown in FIGS. 6 and 7 are denoted by the same reference numerals.

  The fall prevention device 31 is provided on the left and right of the lowermost panel 9.

  The wire 12 fed out from the drum 11 is engaged with the fall prevention device 31, and a force in the upward direction is applied to the shutter curtain 8 through the wire 12.

  A guide roller 36 is rotatably provided on each panel 9 of the shutter curtain 8, and the guide roller 36 is rotatably fitted to the vertical guide rail 3, the curved rail 5, and the horizontal guide rail 4. The shutter curtain 8 moves up and down along the vertical guide rail 3, the curved rail 5, and the horizontal guide rail 4. In the figure, reference numeral 35 denotes a sealing member for sealing between the lower end of the shutter curtain 8 and the floor surface.

  The fall prevention device 31 will be further described.

  A bracket 17 is provided on the lowermost panel 9, and a brake tooth holding body 19 is rotatably provided on the bracket 17 via a rotation support shaft 18. A torsion coil spring (not shown) is mounted on the rotation support shaft 18, and a counterclockwise rotation force (direction approaching the vertical guide rail 3) is applied to the braking tooth holder 19. Yes.

  A braking tooth 21 is fixed to the braking tooth holding body 19 so as to face the vertical guide rail 3, and the braking tooth 21 contacts the vertical guide rail 3 by the counterclockwise rotation of the braking tooth holding body 19. It is possible to contact. Further, a wire engaging portion 32 is formed on the brake tooth holding body 19 so as to protrude downward.

  A wire guide member 33 is provided at the lower end and the side surface of the lowermost panel 9, and the wire guide member 33 has a half moon shape or a substantially half moon shape in which the lower side is an arc or a substantially arc shape. A guide groove 34 is engraved on the peripheral surface. The radius of curvature of the arc of the wire guide member 33 is a value that does not generate excessive stress when the wire 12 is bent along the guide groove 34, and preferably even when repeatedly bent. The radius does not cause fatigue.

  Further, the radius of curvature of the wire guide member 33 and the mounting position of the wire guide member 33 are such that the wire 12 is connected to the wire guide member 33 even when the lowermost panel 9 is in a horizontal state (see FIG. 1). The value and the position are such that they are separated from the guide groove 34.

  The bracket 17, the rotation support shaft 18, the braking tooth holding body 19, and the wire engaging portion 32 are positioned above the wire guide member 33, but the braking tooth holding body 19 is attached to and supported by the panel 9. Both the bracket 17 and the wire guide member 33 are provided on the same panel 9 (lowermost panel 9).

  The wire 12 suspended from the drum 11 (see FIG. 6) is hooked on the wire guide member 33 and is engaged with the wire engaging portion 32.

  When a tension T acts on the wire 12, a moment radius R is formed between the wire engaging portion 32 and the wire 12 a between the wire guide member 33 and the rotation support shaft 18. Accordingly, a clockwise rotational force of M = TR acts on the braking tooth holder 19.

  Further, in the process where the panel 9 passes through the curved rail 5 and reaches the horizontal guide rail 4, the posture of the panel 9 changes 90 ° from vertical to horizontal. In addition, the pulling direction of the wire 12 also changes from a substantially vertical direction to a substantially horizontal direction, and the direction of action of the tension T on the fall prevention device 31 of the wire 12 greatly changes by approximately 180 °.

  On the other hand, since the wire 12 is wound around the drum 11 via the wire guide member 33 and the wire guide member 33 is fixedly provided, the tension T of the wire 12 with respect to the wire guide member 33 is increased. Even when the direction changes, the physical positional relationship between the wire guide member 33 and the wire engaging portion 32 does not change (see FIGS. 1 and 2). Therefore, there is no change in the direction of the tension T of the wire 12a with respect to the braking tooth holder 19, and the moment radius R is constant.

  Accordingly, assuming that the tension T is constant, the rotational force M acting on the braking tooth holding body 19 is constant regardless of the posture of the panel 9, and the braking force when the shutter curtain 8 is opened and closed. The holding of the tooth holder 19 is extremely stable.

  Further, since the length of the wire 12a is constant, there is no slip of the wire 12 with respect to the wire guide member 33, there is no wear of the wire 12 due to opening and closing of the shutter curtain 8, and the wire guide member 33 is Since it is fixed, the wire guide member 33 and the wire 12 are very little deteriorated with time and are excellent in durability.

  Next, when the wire 12 is cut for some reason, the rotational force due to the tension of the wire 12 disappears. Therefore, the brake tooth holding body 19 is counterclockwise by a spring (not shown), that is, the brake tooth 21 is vertical. It rotates in a direction approaching the guide rail 3. When the tip of the braking tooth 21 comes into contact with the vertical guide rail 3, the weight of the shutter curtain 8 is added, the tip of the braking tooth 21 bites into the vertical guide rail 3, and the shutter curtain 8 moves downward. Is stopped.

  In order to release the braking teeth 21 from the vertical guide rail 3, the shutter curtain 8 may be raised. As the shutter curtain 8 moves up, a force acts on the braking teeth 21 in the direction of escaping from the vertical guide rails 3 so that the engagement between the braking teeth 21 and the vertical guide rails 3 is easily released. Is done.

  The wire 12 may be any one that can be bent, and may be, for example, a belt.

It is explanatory drawing which shows the principal part of embodiment of this invention. It is a side view which shows the fall prevention apparatus used for the overhead door which concerns on this invention. It is the perspective view which looked at this fall prevention device from the lower part. It is the perspective view which looked at this fall prevention device from the upper part. It is the perspective view which looked at this fall prevention device and a vertical guide rail from the upper part. It is a perspective view of an overhead door. (A) (B) is explanatory drawing of the conventional fall prevention apparatus. It is explanatory drawing of another conventional fall prevention apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Vertical guide rail 8 Shutter curtain 9 Panel 12 Wire 17 Bracket 19 Braking tooth holding body 21 Braking tooth 31 Fall prevention device 33 Wire guide member 34 Guide groove

Claims (2)

A shutter curtain that is configured by a plurality of panels connected to bendable and that can be moved up and down along the guide rail, and a fall prevention device provided at the lower end of the shutter curtain ;
Comprising a rope member engaged with the fall prevention device, and an opening and closing device for raising and lowering the shutter curtain via the rope member,
The fall prevention device is
A cable guide member provided at the lower end of the shutter curtain ;
A brake tooth holding body positioned above the rope guide member and rotatably provided on the shutter curtain ;
Braking teeth provided on the braking tooth holder;
A spring provided to rotate the brake tooth holding body in the direction of the guide rail ,
The rope guide member has a substantially half-moon shape with an arc shape on the lower side, and a circumferential surface of the arc is opened toward the outer periphery, and a groove is formed in which the rope is fitted from the outside.
The cable is hooked on the cable guide member so as to fit in the groove, and is engaged with the brake tooth holding body. By applying tension to the cable material, the brake tooth holding body is separated from the guide rail. And is held in a predetermined position with respect to the rope guide member,
The rope guide member is configured to change its position with respect to the opening / closing device as the shutter curtain moves up and down, the rope does not slip with respect to the rope guide member, and the winding angle with respect to the rope guide member changes. An overhead door characterized by that. Mounting position of the cord material guide member, the bottom of the panel is in a horizontal position, even if the wrap angle is minimized, according to claim wherein the cord member is made Sama構made without departing from the cord material guide member 1 Overhead door.

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