JP6978535B2 - Impact mitigation device attached to the overhead door and the overhead door equipped with it - Google Patents

Description

The present invention relates to an impact mitigation device for alleviating an impact when the door panel collides with a floor surface and preventing the hanging wire from coming off when the door panel of the overhead door is lowered and closed.

Overhead doors (also called "overdoors") are known that are rolled up at the time of opening or bent to fit parallel to the ceiling in order to open and close the opening of a building such as a garage. In a typical overhead door 60, as shown in FIG. 4, the door panel 1 is raised along a guide rail 2 extending in an inverted L shape from the floor, and is moved while being bent from the vertical direction to the horizontal direction. The opening 32 can be opened with. The end of the wire 3 is fastened to the lower end of the door panel 1, and the wire 3 is wound around a wire drum 5 attached to the rotating shaft 12. A torsion spring 13 is attached to the rotary shaft 12, and the torsion spring 13 generates an urging force in a direction of raising the door panel 1 via the wire 3. Therefore, when the operator raises the door panel 1, it is pulled up with a relatively light force. In Patent Document 1, in consideration of the mechanical life of the torsion spring, the applicant applies an upward force to the door panel by the weight of the counterweight and the weight chain hanging below the counterweight instead of the torsion spring 13. Disclosure of overhead doors.

When closing the overhead door 60, the door panel 1 is lowered downward against the urging force of the torsion spring and the weight of the weight while utilizing the weight of the door panel 1. At this time, if the operator pulls down the door panel 1 vigorously, the door panel 1 may violently hit the floor surface and damage the door panel. In addition, the impact sound may reverberate inside or outside the garage. Further, the tension for pulling down the wire 3 disappears at the moment when the lower end of the door panel 1 collides with the floor surface, but the heavy wire drum 5 and the rotating shaft 12 tend to continue to rotate due to the inertial force. As a result, the wire 3 wound around the drum 3 may sag and come off from the drum 3. In particular, in the overhead door 60 as shown in FIG. 4, since the weight that moves from the horizontal direction to the vertical direction also increases when the door panel 1 is lowered, the door panel is accelerated, and the collision energy and the rotating shaft at the time of landing on the door panel are increased. The inertial force of 12 becomes large.

According to Patent Document 2, when the rope wound around the winding drum becomes slack, the winding drum is rotated in the winding direction by the action of the spring housed in the winding drum to wind the rope. It discloses a mechanism that keeps the rope in a tense state at all times and prevents the rope from coming off the take-up drum. When lowering the suspension body, the take-up drum rotates with the locking piece attached to the take-up drum locked to the arm of the collar attached to the rotating shaft. If there is an obstacle during descent, the rope suspended by the weight of the suspension body will slacken in combination with the rotation of the rotating shaft, but this slack will overcome the spring and lock it to the arm. The locking piece that had been locked comes off the arm and the drum is rotated by the spring force, which winds the slack part of the rope around the drum.

Japanese Patent No. 6531199 Utility model publication 1975-73161 Gazette

In the mechanism disclosed in Patent Document 2, when the suspension body is pulled down, the winding drum rotates while the locking piece attached to the winding drum is locked to the arm of the collar. When the operator pulls down a hanging body such as a door panel vigorously, damage and impact noise due to the collision of the door panel with the floor surface cannot be avoided. In addition, when the suspension body reaches the floor surface, inertial force remains applied to the take-up drum, and it is inevitable that the rope will temporarily sag, and the rope will move outward in the axial direction of the drum. If you sag to pop out, you may not be able to wind the rope back onto the drum.

An object of the present invention is to suppress damage and impact noise due to impact on the floor surface of the door panel when the door panel is pulled down in order to solve the above-mentioned problems of the prior art, and to prevent the wire from sagging due to the inertial force of the drum or shaft. The purpose is to provide a new impact mitigation mechanism for overhead doors that can be prevented. A further object of the present invention is to provide an impact mitigation mechanism that can be easily retrofitted to various existing overhead doors.

According to the present invention, it is an impact mitigation device attached to an overhead door installed in an opening of a building.
The overhead door includes a bendable door panel, a guide rail that movably supports the door panel from both sides, a wire attached to the door panel for pulling up the door panel, and a wire drum for winding the wire. Equipped with a rotating shaft to which a wire drum is attached,
The impact mitigation device
A disc damper that has a rotation axis and attenuates the rotational force in one direction applied to the rotation axis,
A transmission mechanism for transmitting the rotational force of the rotary shaft to the rotary shaft of the disc damper is provided.
The disc damper provides an impact mitigation device that attenuates the rotational force of the rotating shaft in the direction in which the door panel descends.

In the impact mitigation device, the transmission mechanism is attached to a base plate to which the disc damper is attached and fixed to the inner wall of the building, a damper gear attached to the rotating shaft of the disc damper, and the rotating shaft. The damper gear may be provided with a shaft gear that transmits the rotational force of the rotating shaft.

In the impact mitigation device, the base plate may have an alignment mechanism for attaching the damper gear to the shaft gear so as to be alignable. Further, the gear ratio between the damper gear and the shaft gear may be selectable according to the overhead door.

In the impact mitigation device, the transmission mechanism may be a coupling that coaxially connects the rotating shaft and the rotating shaft of the disc damper.

In the impact mitigation device, the disc damper is free to rotate the housing in which the rotation shaft is rotatably attached, the viscous fluid filled in the housing, and the rotation in the direction opposite to one direction of the rotation shaft. It may have a clutch.

In the impact mitigation device, a torsion spring that exerts an urging force in the ascending direction of the door panel may be mounted on the central portion on the axis of the rotating shaft.

According to the present invention, an overhead door provided with the impact mitigation device is provided. The impact mitigation device of the present invention can be retrofitted to an existing overhead door, but the overhead door (system) may be provided with the impact mitigation device from the beginning.

The impact mitigation device of the present invention can be easily attached to an existing overhead door to suppress the impact noise of the door panel of the overhead door, and prevent deterioration and damage due to the impact. Further, it is possible to effectively prevent the wire from coming off the wire drum when the lower end of the door panel lands on the floor.

It is a conceptual diagram which shows the structure of the overhead door 10 attached to the inner wall of a garage. It is an enlarged view which shows 1st Embodiment of the impact mitigation device attached to the overhead door of FIG. It is an enlarged view which shows the 2nd Embodiment of the shock mitigation apparatus. It is a conceptual diagram which shows the structure of the conventional overhead door.

<First Embodiment>
As shown in FIG. 1, the overhead door 10 is provided on the inner wall 11 of the warehouse so as to cover the opening 32 of the garage. The overhead door 10 includes a door panel 1 in which a plurality of panel bodies 1A are flexibly connected by a hinge 7, a guide rail 2 extending in an inverted L shape from the floor, and a plurality of bearings mounted above the opening 32. It mainly includes a rotating shaft 12 pivotally supported by 15. The guide rail 2 has a vertical portion 2V extending in the vertical direction and a horizontal portion 2H bent in the depth direction of the garage from the vicinity of the upper end of the vertical portion 2V and extending in the horizontal direction. The vertical portion 2V and the bearing 15 are attached to the inner wall 11 of the garage, respectively. A plurality of rotatable rollers (not shown) are attached to both sides of the door panel 1 at predetermined intervals, and the rollers slide on the guide rail 2 to move the door panel 1 along the guide rail 2. can do. A handle portion (not shown) is provided on the outer surface of the door panel 1 for the operator to hold and lift the door panel 1.

A pair of wire drums 5 are coaxially attached to the rotating shaft 12. The ends of the wires 3 wound around the pair of wire drums 5 are fixed to both ends of the bottom panel body 1A, respectively. A torsion spring 13 is mounted coaxially with the rotary shaft 12 in the central portion of the rotary shaft 12. The torsion spring 13 is urged in a rotational direction (hereinafter, appropriately referred to as "positive direction") in which the rotary shaft 12 pulls up the door panel 1 via the wire 3.

The impact mitigation device 50 of this embodiment is mounted near the end of one of the rotating shafts 12 (left side of FIG. 1). As shown in FIG. 2, the impact mitigation device 50 includes a first sprocket 21 (shaft gear) mounted coaxially with the rotary shaft 12 at the end of the rotary shaft 12, a base plate 30 fixed to the inner wall 11 of the garage, and the base plate 30. The disc damper 40 attached to the base plate 30, the second sprocket 22 (damper gear) coaxially fixed to the rotation axis of the disc damper 40, and the roller chain 36 hung on the first sprocket 21 and the second sprocket 22. Mainly has. The first sprocket 21 is detachably attached to a position outside the wire drum 5 and the bearing 15 of the rotating shaft 12. The first sprocket 21, the base plate 30, the second sprocket 22, and the roller chain 36 function as a transmission mechanism for connecting the rotary shaft 12 and the disc damper 40 and transmitting the rotational force of the rotary shaft 12 to the disc damper 40.

The disc damper 40 has a one-way clutch built in, in which a viscous fluid such as silicone oil is filled inside the housing 40b on which the rotation shaft is pivotally supported. Due to the action of the clutch, resistance (or torque) due to the viscous fluid is applied to only one rotation direction of the rotation shaft, so that the rotational force of the rotation shaft in that rotation direction is attenuated. On the other hand, the rotational force of the rotation axis in the opposite rotation direction (free direction) is not attenuated. This type of disc damper is sometimes called a one-way rotary damper. Since the viscous resistance of the fluid of the disc damper 40 is proportional to the fluid speed or the rotation speed of the rotating shaft, the faster the rotation of the rotating shaft, the more the rotation is braked. As described above, the second sprocket 22 is coaxially fixed to the rotating shaft of the disc damper 40, and they rotate together in order to interlock with the rotating shaft via the roller chain 36 and the first sprocket 21. do. Therefore, the more rapidly the operator lowers the door panel, the more the momentum is relaxed through the disc damper 40.

The base plate 30 has an L-shape, and has a base portion 30a attached to the garage inner wall 11, an overhanging portion 30b that bends from the base portion and extends toward the inside of the garage, and a bracket 38 attached to the overhanging portion 30b. Is attached. The bracket 38 is a U-shaped bracket having a long plate portion 38a extending in parallel with each other, a short plate portion 38b, and a connecting portion 38c connecting them. By providing the elongated hole 30c through which the bolt penetrates in the elongated plate portion 38a or the overhanging portion 30b, the bracket 38 can be mounted so as to be aligned with the base plate 30. The housing 40b of the disc damper 40 is fixed to the short plate portion 38b, and the second sprocket 22 is coaxially attached to the rotating shaft of the disc damper 40. When the second sprocket 22 rotates, the rotation axis of the disc damper 40 also rotates. The overhanging portion 30b and the bracket 38 of the base plate 30 function as an alignment mechanism for aligning the first sprocket 21 with the second sprocket 22, facilitating the work of attaching the impact mitigation device 50 to the overhead door 10. ..

Next, the operation of the overhead door 10 provided with the impact mitigation device 50 will be described. In order to open the opening 32 of the building from the closed state by the overhead door 10 shown in FIG. 1, the operator manually lifts the handle portion of the door panel 1. At this time, since the torsion spring 13 is urged in the positive direction to pull up the door panel 1 through the wire 3, the operator can lift the door panel 1 with a relatively small force. Since the rotating shaft 12 also rotates in the same positive direction (clockwise when viewed from the left side in FIG. 1) due to the urging force of the torsion spring 13, the wire 3 is wound around the wire drum 5. At the same time as the rotation of the rotating shaft 12, the rotation axes of the first sprocket 21, the second sprocket 22 linked thereto, and the disc damper 40 also rotate in the positive direction (clockwise when viewed from the left side of FIG. 1). Since this rotation direction of the disc damper rotation axis is a free direction, damping force does not work. When the door panel 1 is further lifted, the door panel 1 gradually moves from the vertical portion 2V to the horizontal portion 2H, and the weight of the portion of the door panel 1 along the vertical portion 2V gradually decreases, so that the force required to lift the door panel 1 is also obtained. It gradually decreases. When the door panel 1 is completely housed in the horizontal portion 2H, the garage opening 32 is opened.

Next, in order to close the door panel 1, the operator first pulls a string (not shown) attached to the lower end or the lower end of the door panel 1 to move the lower end of the door panel 1 to the vertical portion 2V of the guide rail 2. Next, the lower end of the door panel 1 and the handle are touched to lower the door panel 1. At this time, since the wire 3 is fastened to the lower end of the door panel 1, the wire 3 is pulled out from the wire drum 5, and the rotating shaft 12 resists the urging force of the torsion spring 13 in the direction opposite to the forward direction. Reverse rotation. Due to the reverse rotation of the rotating shaft 12, the first sprocket 21 also rotates in the reverse direction, and the rotation shafts of the second sprocket 22 and the disc damper 40 also try to rotate in the reverse direction via the roller chain 36.

As described above, in the overhead door as shown in FIG. 1, the weight that moves from the horizontal direction to the vertical direction when the door panel 1 is lowered also increases, so that the door panel is accelerated and the collision energy and rotation at the time of landing on the door panel are increased. The shaft 12 has a large inertial force. However, the disc damper 40 attenuates the rotational force of the rotary shaft 12 because it generates resistance in the reverse rotational direction. Therefore, even if the operator tries to lower the door panel 1 vigorously, the kinetic energy of the door panel 1 moving downward is also attenuated, and the speed is reduced so that the brake is gradually applied. Therefore, it is prevented that the lower end of the door panel 1 vigorously collides with the floor surface, and damage to the door panel 1 and impact noise due to the collision are less likely to occur. Further, since the rotation speed of the rotary shaft 12 is reduced, the inertial force of the wire drum 5 generated when the lower end of the door panel 1 comes into contact with the floor surface is suppressed, and the wire 3 is prevented from coming off from the wire drum 5.

The overhead door of the present embodiment has the following technical effects.
(1) Since the disc damper that generates resistance force only in one rotation direction is connected to the rotation shaft through the first and second sprockets, the appropriate brake works even if the operator lowers the door panel vigorously. It prevents the door panel from colliding suddenly with the floor. As a result, damage to the door panel and impact noise due to a collision are less likely to occur. On the other hand, when the door panel is raised, it does not affect the operation of the operator.
(2) Since the disc damper that attenuates the rotational force only in one direction of rotation is connected to the rotary shaft via the first and second sprocket, the rotary shaft 12 can be vigorously lowered even if the operator lowers the door panel vigorously. The rotation speed is reduced to prevent the rotating shaft and wire drum from rotating (idle) due to inertial force when the door panel reaches the floor. This prevents the wire from coming off the wire drum.
(3) Since the impact mitigation device is composed of parts that can be retrofitted to the rotating shaft, it can be attached to the existing overhead door by simple construction.
(4) Since the impact mitigation device is equipped with an alignment mechanism so that the disc damper can be installed while aligning with the rotating shaft, it can be easily impacted according to various types of overhead doors and installation locations. The mitigation device can be retrofitted to existing overhead doors.
(5) The torque applied to the disc damper can be adjusted by appropriately changing the gear ratio between the first sprocket and the second sprocket. Therefore, the braking force related to the door panel can be adjusted by selecting an appropriate first sprocket and second sprocket according to the weight, dimensions, opening / closing resistance, etc. of the existing overhead door.

<Second Embodiment>
In the first embodiment, the disc damper 40 is provided outside the axis of the rotating shaft 12, but the disc damper 40 may be provided coaxially with the rotating shaft 12. A specific example is shown in FIG. In the impact mitigation device 50'shown in FIG. 3, the rotating shaft 40a of the disc damper 40 is coaxially connected to the rotating shaft 12 via a coupling 45. That is, the coupling 45 functions as a transmission mechanism for transmitting the rotation of the rotary shaft 12 to the disc damper 40. Therefore, in this embodiment, power transmission members such as the first and second sprockets and the roller chain can be omitted. The coupling 45 also has a function of preventing the rotation shaft 40a of the disc damper 40 and the rotation shaft 12 from being misaligned. The housing 40b of the disc damper 40 is fixed to the short plate portion 38b of the bracket 38 in the same manner as in the first embodiment, and the rotation shaft 40a of the disc damper 40 is the long plate portion 38a of the bracket 38 and the overhanging portion 30b of the base plate 30. It penetrates the through hole 38d and is connected to the coupling 45. The description of the same part as that of the first embodiment will be omitted.

The impact mitigation device 50'of the second embodiment is used in the same manner as the impact mitigation device 50 of the first embodiment except that the damping force (torque) generated from the disc damper 40 described in the first embodiment is adjusted. It is a method, and its action is the same. Therefore, the effects described in (1) to (4) of the first embodiment can be obtained.

Although the present invention has been specifically described with reference to embodiments, the present invention is not limited thereto, and it goes without saying that modifications and improvements easily conceived by those skilled in the art from the present application are also included in the scope of the present invention. For example, the guide rail 2 of the overhead door may have any shape, and in the above embodiment, it has a vertical portion 2V, a horizontal portion 2H, and a bent portion between them, but the vertical portion 2V is not necessarily perpendicular to the floor surface. It is not necessary, or the horizontal portions 2H do not necessarily have to be parallel or horizontal to the floor surface, and they may be inclined at an inclination angle of, for example, several degrees to a dozen degrees.

Although the disc damper 40 is used in the above embodiment, if it is a damper that generates a resistance force only in one direction of rotation, a damper using an arbitrary elastic body or the like other than the one using a viscous fluid is used. Can be used. A bracket 38 is provided as an alignment mechanism for aligning the disc damper 40 or the first sprocket 21 with the rotating shaft 12 or the second sprocket 22, but the second sprocket 22 and the disc damper 40 are attached to the base plate 30. , The base plate 30 may be aligned with respect to the building inner wall 11.

Further, in the first embodiment, the roller chain 36 is used as a member for transmitting power from the first sprocket 21 to the second sprocket 22, but an endless belt, a wire, or a gear may be used instead. Alternatively, the first sprocket 21 and the second sprocket 22 may be directly meshed with each other without using a power transmission member such as a chain 36. Further, in the above embodiment, a torsion spring is used to reduce the force for raising the door panel, but a weight drum disclosed in Patent Document 1 can be used instead.

The impact mitigation device for an overhead door of the present invention can effectively prevent damage to the door panel and generation of impact noise due to the sudden collision of the door panel with the floor, thus improving the durability of the overhead door. Further, since the wire can be effectively prevented from coming off from the wire drum when the lower end of the door panel lands on the floor, the failure and the repair for it are reduced. Furthermore, since it can be retrofitted to an existing overhead door, the operation of the existing overhead door can be quieted and the product life can be extended.

1 Door panel, 1A Door panel body 2 Guide rail, 2V vertical part, 2H horizontal part 3 Wire 5 Wire drum 11 Garage inner wall 12 Rotating shaft 13 Torsion spring 50 Impact mitigation device 50
21 1st sprocket 22 2nd sprocket 30 Base plate, 30a Base, 30b Overhang 30c Long hole 32 Warehouse opening 36 Roller chain 38 Bracket, 38a Long plate, 38b Short plate, 38c Connecting part 38d Through hole
40 Disc Damper 10,60 Overhead Door

Claims (4)

A shock absorber attached to an overhead door installed in a building opening.
The overhead door includes a bendable door panel, a guide rail that movably supports the door panel from both sides, a wire attached to the door panel for pulling up the door panel, and a wire drum for winding the wire. Equipped with a rotating shaft to which a wire drum is attached,
The impact mitigation device
A disc damper that has a rotation axis and attenuates the rotational force in one direction applied to the rotation axis,
A transmission mechanism for transmitting the rotational force of the rotary shaft to the rotary shaft of the disc damper is provided.
The transmission mechanism includes a base plate to which the disc damper is attached and fixed to the inner wall of the building, a damper gear attached to the rotation shaft of the disc damper, and the rotation of the damper gear attached to the rotation shaft. Equipped with a shaft gear that transmits the rotational force of the shaft,
The base plate has an alignment mechanism that attaches the damper gear to the shaft gear so that it can be aligned.
The gear ratio between the damper gear and the shaft gear can be selected according to the overhead door.
The disc damper is an impact mitigation device that attenuates the rotational force of the rotating shaft in the direction in which the door panel descends. The disk damper includes a housing in which the rotary shaft is rotatably mounted, according to claim 1 having a viscous fluid filled inside the housing, the clutch and free rotation in one direction opposite to the direction of said rotary shaft shock absorbing device according to. The impact mitigation device according to claim 1 or 2 , wherein a torsion spring that exerts an urging force in an ascending direction of the door panel is mounted on a central portion on the axis of the rotating shaft. An overhead door provided with the impact mitigation device according to any one of claims 1 to 3.

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