JP4085921B2 - Garage door - Google Patents

Description

  The present invention relates to a garage door that opens a doorway of a garage by driving a door body upward.

  Conventionally, in a garage door that opens the garage doorway by moving the door body above the garage doorway, for example, a column with a drive motor built up beside the garage doorway, A pivot shaft is connected to the base end of the arm to which the door body is attached. The pivot shaft is pivotally supported by a pivot hole provided in the column, and the arm is pivotally supported on the column so that it can be pivoted up and down. A garage door of a flip-up type in which the arm is rotated by driving and the door is closed with a substantially vertical door body, and the door body is positioned substantially horizontally above the doorway to open the doorway. Is known (see, for example, Patent Document 1).

By the way, such an opening / closing operation of the garage door is preferably performed by detecting, for example, an overload applied to the drive motor, upper / lower limit positions of the door body, and the like, and performing control according to this detection information. For accurate control, it is basically necessary to accurately grasp the current position of the door. Thus, in the course of reaching the present invention, the present inventor attaches detection means for detecting the rotation angle of the arm to the support column so that the current position of the door body can be grasped from the rotation angle of the arm detected by the detection means. Led to the development of a garage door. The detection means in this developed product, in detail, employs a structure that measures the rotation angle of the rotating body integrally attached to the pivot shaft that rotates together with the arm with a sensor attached to the support column. .
JP-A-6-93784

  However, since the arm of the garage door is pivoted with a relatively heavy door attached to the tip, there is a case where the pivoting shaft is heavily loaded and the pivoting shaft rattles against the column. However, since the rotating body as well as the pivot shaft swings against the support, the relative distance between the sensor attached to the support and the rotating body changes, and the rotation angle of the rotating body detected by the sensor and the actual arm rotation As a result, there arises a problem that effective control relating to the opening / closing operation of the garage door cannot be performed.

  The present invention has been invented in view of the above-described conventional problems, and even when the arm rattles against the support, the rotation angle of the arm can be accurately detected to effectively control the opening / closing operation of the garage door. It is an object of the present invention to provide a garage door.

  In order to solve the above problems, a garage door according to the present invention is pivotally supported at the base end of an arm 2 in which a support column 3 with a drive motor 4 is installed on the side of a garage doorway and a door body 1 is attached to the tip. The shaft 5 is connected, the pivot shaft 5 is pivotally supported in the pivot hole 25 provided in the column 3, and the arm 2 is pivotally supported on the column 3 so as to be pivotable up and down, and the arm 2 is driven by the drive motor 4. The door 1 is moved up and down to open and close the doorway, and in the garage door in which the detection means 13 for detecting the rotation angle of the arm 2 is installed in the support column 3, the detection means 13 becomes an outer shell. The case 14 includes a case 15, a rotating body 15 pivotally supported on the case 14, and a sensor 16 that is fixed to the case 14 and detects a rotation angle of the rotating body 15. 5 are connected via a fitting structure, and the case 1 is connected via an elastic support 22. The is characterized in that mounted on the column 3.

  According to this, the pivot shaft 5 integrally connected to the base end of the arm 2 is integrally connected to the rotation center of the rotating body 15 through the fitting structure, and the rotating body 15 is pivotally supported by the case 14 so as to be rotatable. The case 14 is attached to the support column 3 via a support 22 having elasticity, and the sensor 16 for detecting the rotation angle of the rotating body 15 is fixed to the case 14, so that the arm 2, the case 14, The rotating body 15 and the sensor 16 are integrated with each other and can vibrate with respect to the column 3. That is, even if the arm 2 rattles against the column 3, the sensor 16 and the rotating body 15 that vibrate integrally. Therefore, even when the arm 2 rattles against the support column 3, the rotation angle of the arm 2 can be accurately detected by the sensor 16, and the garage door can be opened and closed. Effective for operation Is of the control can be secured.

  The large-diameter gear 19 and the small-diameter gear 20 that mesh with each other constitute a rotating body 15, the pivot shaft 5 is connected to the rotation center of the large-diameter gear 19, and the rotation angle of the small-diameter gear 20 is detected by the sensor 16. It is also preferable to do so. According to this, since the rotation angle of the small-diameter gear 20 obtained by amplifying the rotation angle of the large-diameter gear 19 is detected by the sensor 16, the rotation angle of the arm 2 can be accurately detected and the current position of the door body 1 can be accurately determined. It can grasp and can contribute to the improvement of the control concerning the opening and closing operation of the garage door.

  In addition, a confirmation window 29 in which a meshing portion between the large-diameter gear 19 and the small-diameter gear 20 can be seen is formed in the case 14, and a mark 28 indicating a reference meshing position is provided on each of the large-diameter gear 19 and the small-diameter gear 20. preferable. According to this, the large diameter gear 19 and the small diameter gear 20 can be easily and accurately engaged with each other based on the mark 28, and the mark 28 can be viewed from the confirmation window 29 after the detection means 13 is assembled. Thus, the degree of meshing between the large diameter gear 19 and the small diameter gear 20 can be easily confirmed.

  Further, the case 14 of the detecting means 13 is constituted by a set of rotating body mounting plates 17 having the same shape, and the pair of rotating body mounting plates 17 are arranged opposite to each other with a spacer 18 therebetween, and a pair of facing each other. A large-diameter gear bearing portion 24a and a small-diameter gear bearing portion 24b are provided at positions opposed to the rotating body mounting plate 17, and the large-diameter gear 19 is pivotally supported between a pair of opposed large-diameter gear bearing portions 24a having the same shape. In addition, it is also preferable that the small-diameter gear 20 is pivotally supported between a pair of opposing small-diameter gear bearings 24b having the same shape. According to this, the left-handed and right-handed detection means 13a, 13b can be easily formed with the same parts by assembling the rotating body 15 with the front and back reversed between the pair of rotating body mounting plates 17. . That is, the detection means 13 can be composed of the same parts regardless of the left-handed or right-handed, so that the increase in the number of parts can be suppressed and the manufacturing cost can be greatly reduced. It should be noted that a pair of support columns 3 are erected on both sides of the doorway of the garage, both width ends of the door body 1 are supported by a pair of arms 2, and each arm 2 is pivotally supported by each support column 3. The garage door that rotates each arm 2 with a drive motor 4 built in each column 3 has a symmetrical structure with the center in the width direction of the door body 1 as a boundary. The left-handed and right-handed detecting means 13a and 13b are required for the interior, but the detecting means 13 that can easily form the left-right hand is particularly effective when mounting to such a garage door. It is.

  In the present invention, as described above, the detection means includes a case serving as an outer shell, a rotating body that is rotatably supported by the case, and a sensor that is fixed to the case and detects the rotation angle of the rotating body. Since the pivot shaft is connected to the rotation center of the rotating body via a fitting structure, and the case is attached to the support via the elastic support body, the arm, the case, the rotating body and the sensor are integrated. It is possible to vibrate with respect to the column, that is, even if the arm rattles against the column, the relative distance between the sensor that vibrates together and the rotating body does not change. Even when connected, the rotation angle of the arm can be accurately detected by the sensor, and effective control for the opening / closing operation of the garage door can be secured.

  The garage door of the example of embodiment of this invention is shown in FIGS. In this garage door, the door 1 is closed by the door body 1 in a substantially vertical state as shown in FIG. 2A, and the door body 1 is positioned substantially horizontally above the door as shown in FIG. 2B. And is a flip-up type in which the doorway is opened, the pivot shaft 5 is connected to the proximal end of the arm 2 with the door body 1 attached to the distal end, and pivotally supported in the pivot hole 25 provided in the column 3. The shaft 5 is pivotally supported and the arm 2 is pivotally supported on the column 3 so as to be pivotable up and down, and the arm 2 is rotationally driven via the pivot shaft 5 by the drive motor 4 built in the column 3, thereby the door body 1. The structure of the detection means 13 is the same as that of the general garage door in which the detection means 13 for detecting the rotation angle of the arm 2 is installed in the support column 3. The detection unit 13 has a feature in the mounting structure to the column 3. Details will be described below.

  The support columns 3 shown in FIG. 3 are erected substantially vertically on both sides of the doorway of the garage. The door body 1 is plate-shaped, and the front ends of the arms 2 are rotatably connected to both width end portions thereof. The pair of arms 2 has a horizontal pivot shaft 5 integrally connected to the base end thereof, and the pivot shaft 5 corresponding to a pivot hole 25 (FIG. 4) drilled horizontally in the upper part of each column 3. As a result, the arms 2 are pivotally supported by the columns 3 so as to be pivotable up and down. Note that the arm 2 in this example firmly supports the door body 1 that changes its posture while rotating up and down, so that the main arm 2a connected to the upper end of the door body 1 and the upper and lower sides of the door body 1 It is comprised with the subarm 2b connected in the middle. The pivot shaft 5 is connected to the drive motor 4 via a transmission mechanism, and each arm 2 is rotationally driven up and down by the drive motor 4 built in each column 3 so that the door body 1 opens and closes the doorway. ing.

  FIG. 4 shows the transmission mechanism. A prism-shaped lifting body 6 is disposed inside the column 3 so as to be movable up and down. Chain-like racks 7a and 7b extending vertically are provided on two adjacent side surfaces of the lift 6. An arm-side sprocket 8 is attached to a pivot shaft 5 connected to the arm 2 and pivotally supported by the support column 3, and the arm-side sprocket 8 meshes with one rack 7a. A motor-side sprocket 9 is attached to the rotating shaft of the drive motor 4 built in the support column 3, and the motor-side sprocket 9 is engaged with the other rack 7b. When the drive motor 4 is driven to rotate in the forward direction, as shown in FIG. 2 (b), the elevating body 6 slides upward in the column 3, and the pivot shaft 5 and the arm 2 are rotationally driven upward, and the doorway The door body 1 is raised so as to open. On the other hand, when the drive motor 4 is driven in the reverse direction, as shown in FIG. 2 (a), the elevating body 6 slides downward in the column 3, the pivot shaft 5 and the arm 2 are rotationally driven downward, and the doorway is closed. Thus, the door body 1 is lowered. As shown in FIG. 2, an urging mechanism that pushes the lifting body 6 upward is built in the column 3 to assist the lifting of the arm 2 by the drive motor 4 or to the ground at the doorway of the door body 1. Collision avoidance is planned. Generally, a gas spring 10 or a coil spring is used for this urging mechanism. In FIG. 2, reference numeral 12 denotes a rigid reinforcing cross member for preventing the door body 1 from being twisted.

  In the garage door of this example, a remote control device is employed as the operation switch. That is, the antenna 11 (FIG. 3) provided on the support column 3 is connected to a control unit that controls the opening / closing operation of the garage door, and the user operates the operation key of a separate transmission unit so that the user can Remote operation of the garage door from a remote place (for example, in a car) is enabled. Here, as described in the section of the background art, in order to control the opening / closing operation of the garage door performed by the control unit, it is basically necessary to accurately grasp the current position of the door body 1. Therefore, in the garage door of this example, a detection means 13 for detecting the rotation angle of the arm 2 is provided in the support column 3 so as to grasp the current position of the door body 1.

  As shown in FIG. 5, the detection means 13 includes a case 14 as an outer shell, a rotating body 15 pivotally supported on the case 14, and a sensor that is fixed to the case 14 and detects the rotation angle of the rotating body 15. 16. And the mounting structure of this detection means 13 to the support | pillar 3 connects the pivot shaft 5 to the rotation center of the rotary body 15 through a fitting structure, and makes the rotary body 15 integrally rotatable with the pivot shaft 5. A structure in which the case 14 is attached to the support column 3 via an elastic support 22 is employed. By the way, as described in the section of the background art, the pivot shaft 5 is subjected to a rotational moment by the door body 1 attached to the tip of the arm 2, and the arm 2 rattles against the support column 3. However, in this example, the structure of the detecting means 13 and the structure of attaching the detecting means 13 to the column 3 are employed. As a result, the above problems have been solved.

  That is, in this example, the pivot shaft 5 integrally connected to the base end of the arm 2 is integrally connected to the center of rotation of the rotating body 15 via the fitting structure, and the rotating body 15 is rotatable to the case 14. The case 14 is pivotally supported, and the case 14 is attached to the support column 3 via an elastic support body 22, and the sensor 16 for detecting the rotation angle of the rotating body 15 is fixed to the case 14. 14, the rotating body 15 and the sensor 16 are integrated with each other and can vibrate with respect to the support column 3. That is, even if the arm 2 rattles with respect to the support column 3, it rotates with the sensor 16 that vibrates integrally. Since the relative distance to the body 15 does not change, it is possible to accurately detect the rotation angle of the arm 2 with the sensor 16 even when the arm 2 rattles against the support column 3. For opening and closing garage doors Cal effective control is what is ensured.

  In detail, in the detection means 13 of this example, the case 14 is composed of a set of rotating body mounting plates 17 of the same shape facing each other with the rotating body 15 interposed therebetween. That is, the pair of rotating body mounting plates 17 is provided with the spacers 18 at the four corners thereof, and is arranged opposite to each other with a predetermined interval to form the case 14. For convenience, the opposing surfaces of the pair of rotating body mounting plates 17 are referred to as inner surfaces, and the non-opposing surfaces are referred to as outer surfaces. The rotating body 15 is composed of a pair of meshing gears. One gear is integrally connected to the pivot shaft 5 so as to rotate integrally with the pivot shaft 5, and the rotation angle of the other gear is detected by a sensor 16. In this example, a large-diameter gear 19 is used as a gear integrally connected to the pivot shaft 5, and a small-diameter gear 20 is used as a gear whose rotation angle is detected by the sensor 16. The large-diameter gear 19 and the small-diameter gear 20 are disk-like gears having different diameters, and the small-diameter gear 20 rotates more with respect to the large-diameter gear 19 according to the gear ratio. The sensor 16 is configured by arranging a sensor element 16b on a printed circuit board 16a, and is fixed so as to serve as a spacer so as to cover a shaft portion of the small-diameter gear 20 facing outward from a small-diameter gear bearing portion 24b described later. It is fixed to the outer surface of the rotating body mounting plate 17 via the tool 21.

  Further, the detection means 13 is stably attached to an L-shaped receiving frame 23 fixed to the support column 3 via a support 22 having elasticity at a plurality of locations on the outer edge portion. The support 22 is a columnar body formed of elastically deformable rubber or the like, and is formed by connecting protrusions 22b in the length direction of the hexagonal cylindrical column main body 22a. The detecting means 13 is fixed to the receiving frame 23 by fitting the protrusion 22 b into the through hole of the rotating body mounting plate 17. That is, the column main body 22a serves as a spacer, and the detection means 13 is fixed in parallel to the receiving frame 23 at a predetermined interval. The support 22 is fixed to the receiving frame 23 by, for example, fixing the end face in the length direction of the column main body 22a to the receiving frame 23 with an adhesive, or the through hole of the receiving frame 23 in the cylinder interior 22c of the column main body 22a. It is carried out by using an appropriate means such as screwing a screw passed through. Here, a pivotal support hole 25 is drilled in the receiving frame 23, and the pivotal support shaft 5 is inserted toward the detection means 13 attached to the receiving frame 23 (FIG. 7).

  Here, the large-diameter gear 19 (small-diameter gear 20) is rotatably disposed between the pair of rotating body mounting plates 17, and this is located at the rotational center portion of the large-diameter gear 19 (small-diameter gear 20). A shaft portion 19a (shaft portion 20a) projects from the disk surface in both front and back directions, and a large-diameter gear bearing portion 24a (small-diameter gear bearing portion 24b) is provided at a position opposite to the pair of rotating body mounting plates 17. The shaft portion 19a of the large diameter gear 19 is pivotally supported on the large diameter gear bearing portion 24a, and the shaft portion 20a of the small diameter gear 20 is pivotally supported on the small diameter gear bearing portion 24b. When the detecting means 13 is attached to the receiving frame 23, the large-diameter gear bearing 24a is disposed coaxially with the pivot hole 25, and is larger than the pivot shaft 5 pivotally supported by the pivot hole 25. The shaft portion 19a of the large-diameter gear 19 pivotally supported by the diameter gear bearing portion 24a is connected. The large-diameter gear 19 and the pivot shaft 5 are connected to each other by a non-circular fitting hole 26 (in this example, having a D-shaped cross-section) drilled in the axial direction on the shaft end surface of the shaft portion 19a of the large-diameter gear 19. The fitting shaft portion 27 (in this example, a shaft having a D-shaped cross section (see FIG. 7) in this example) that is projected in the axial direction on the shaft end surface of the pivot shaft 5 is fitted into the hole). Has been done.

  As described above, in the detection means 13 of this example, the rotating body 15 is constituted by the large diameter gear 19 and the small diameter gear 20 that mesh with each other, the pivot shaft 5 is connected to the rotation center of the large diameter gear 19, and the sensor 16. Since the rotation angle of the small diameter gear 20 is detected by the sensor 16, the rotation angle of the small diameter gear 20 obtained by amplifying the rotation angle of the large diameter gear 19 can be detected by the sensor 16, that is, the arm 2 The rotation angle can be accurately detected, and the current position of the door body 1 can be grasped more accurately. Therefore, the accuracy of control related to the opening / closing operation of the garage door is improved. As described above, the rotation angle of the arm 2 is amplified using the large-diameter gear 19 and the small-diameter gear 20 and the amplified rotation angle is detected by the sensor 16 from the opening / closing angle of the door. However, when the detectable angle of the sensor 16 is large, it is advantageous because the detectable angle of the sensor 16 can be utilized as much as possible and the detection accuracy of the sensor 16 can be increased. For example, when the opening / closing angle of the door is about 90 ° and the detectable angle of the sensor 16 is about 300 °, the large-diameter gear 19 and the small-diameter gear 20 having a gear ratio set to 3: 1 are used. The detection angle can be amplified three times (about 90 × 3≈270), the detectable angle of the sensor 16 that is about 300 ° can be utilized as much as possible, and the detection accuracy can be improved three times. .

  Needless to say, a meshing failure between the large-diameter gear 19 and the small-diameter gear 20 causes a detection failure and is not allowed. Therefore, the detection means 13 of this example is devised so as not to cause a meshing failure between the large diameter gear 19 and the small diameter gear 20. In other words, the large diameter gear 19 and the small diameter gear 20 are provided with marks 28 indicating the reference mesh position. In this example, the mark 28 is composed of a linear protrusion extending radially outward from the rotation center of each gear, and when the large diameter gear 19 and the small diameter gear 20 are engaged at a normal position as shown in FIG. The linear protrusions of each gear form a single line connecting the rotation centers of the respective gears. In this manner, the large diameter gear 19 and the small diameter gear 20 can be easily and accurately engaged with each other by using the mark 28. Further, a confirmation window 29 is formed in the case 14 so that the meshing portion between the large diameter gear 19 and the small diameter gear 20 can be seen. Thereby, even after the detection means 13 is assembled, the meshing state of the large diameter gear 19 and the small diameter gear 20 can be easily confirmed by looking at the mark 28 from the confirmation window 29.

  By the way, like the garage door of this example, a pair of support pillars 3 are erected on both sides of the entrance of the garage, both width ends of the door body 1 are supported by the pair of arms 2, and each arm 3 is attached to each arm 3. In a garage door of the type in which each arm 2 is rotationally driven by a drive motor 4 built in each column 3 and pivotally supported by 2 respectively, the door body 1 has a symmetrical structure with the center in the width direction as a boundary. The left-handed detecting means 13a (FIGS. 1, 5 to 8) and the right-handed detecting means 13b (FIGS. 9 and 10) are required to install the detecting means 13 in each column 3. Such left-handed and right-handed members are basically formed by using parts that are reversed in the left-right direction, but are formed by using parts that are reversed in the left-right direction as described above. As a result, the number of parts increases, and a mold for molding each part is required, resulting in an increase in manufacturing cost. Therefore, in order to suppress the increase in the number of parts and the increase in manufacturing cost, the detection means 13 of this example is devised in the structure so that the left-handed and right-handed detection means 13a, 13b can be formed with the same parts. Has been. Details will be described below.

  First, a pair of rotating body mounting plates 17 having the same shape are arranged to face each other with a spacer 18 therebetween, so that the case 14 is formed, and the rotating body 15 is sandwiched between the pair of rotating body mounting plates 17. The detection means 13 employs a basic structure such as disposing the above. The rotating body 15 is composed of a large-diameter gear 19 and a small-diameter gear 20, but a pair of shaft portions 19a (20a) projecting from the disk surface of the large-diameter gear 19 (small-diameter gear 20) in the front and back directions are the same. The shape of the large-diameter gear bearing portion 24a (small-diameter gear bearing portion 24b) of the pair of rotating body mounting plates 17 facing each other is also given the same shape. Thus, in order to assemble the detection means 13 with different right and left hand using the components of the detection means 13 (a set of rotating body mounting plates 17, a large diameter gear 19, a small diameter gear 20, and a sensor 16), Regardless of whether the body mounting plate 17 is left or right, a pair of rotating body mounting plates is provided by opposingly arranging the body 18 with a predetermined interval through a spacer 18 and reversing the front and back of the large-diameter gear 19 and the small-diameter gear 20 according to the left and right sides. The sensor 16 can be mounted on one rotating body mounting plate 17 selected according to the left and right sides. In other words, the difference between the left-handed detection means 13a and the right-handed detection means 13b is that the large-diameter gear 19 and the small-diameter gear 20 that are the rotating bodies 15 are reversed in the front and back directions, and a set of rotating bodies. Among the mounting plates 17, the rotating body mounting plate 17 to which the sensor 16 is mounted is different. As described above, the pair of shaft portions 19 a (20 a) projecting from the front and back of the large-diameter gear 19 (small-diameter gear 20). Are the same shape, and the pair of large-diameter gear bearing portions 24a (small-diameter gear bearing portion 24b) that pivotally supports the pair of shaft portions 19a (20a) have the same shape. The gear 19 and the small-diameter gear 20 can be disposed at predetermined positions between the pair of rotating body mounting plates 17 with the shaft portions 19a and 20a being pivotally supported by the bearing portions 24a and 24b. Since the rotating body mounting plate 17 has the same shape, Sensor 16 to the rotating body mounting plate 17 is attachable, Thus, left hand was used parts is the right-hand sensing means 13a, 13b is adapted to be formed. In this way, the detection means 13 of this example can easily form the left-handed and right-handed detection means 13a, 13b with the same parts, thereby suppressing an increase in the number of parts and greatly reducing the manufacturing cost. It is possible. In this example, a screw 18a or the like is used for the spacer 18 for integrating the set of rotating body mounting plates 17 so that the set of rotating body mounting plates 17 is detachable (can be disassembled). As a result, even after the right-handed detection means 13b is assembled, the detection means 13b can be disassembled and reassembled as the left-handed detection means 13a. Improvements are being made.

It is a disassembled perspective view explaining attachment to the support | pillar of the left-handed detection means in the garage door of the example of embodiment of this invention. (A) and (b) are the schematic perspective views which notched some explaining the opening-and-closing state of a garage door. It is a perspective view of a support | pillar. (A) is the perspective view seen from the front side of the transmission mechanism, (b) is the perspective view seen from the back side of the transmission mechanism. It is the perspective view which saw through a part of left-handed detection means. It is a perspective view which shows the state which attached the left-handed detection means to the support | pillar. It is a perspective view which shows the state before attaching a left-handed detection means to a support | pillar. It is the front view which saw through the case of the left-handed detection means. It is a disassembled perspective view explaining the attachment to the support | pillar of the detection means of a right hand. It is a perspective view which shows the state which attached the right-handed detection means to the support | pillar.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Door body 2 Arm 3 Support | pillar 4 Drive motor 5 Pivot shaft 13 Detection means 13a Left-hand detection means 13b Right-hand detection means 14 Case 15 Rotating body 16 Sensor 17 Rotating body mounting plate 18 Spacer 19 Large diameter gear 20 Small diameter gear 22 Support 24a Large-diameter gear bearing 24b Small-diameter gear bearing 25 Pivoting hole 28 Mark 29 Confirmation window

Claims (4)

  A support column with a drive motor is installed beside the doorway of the garage, a pivot shaft is connected to the base end of the arm with a door attached to the tip, and the pivot shaft is pivotally supported in a pivot hole provided in the column. The arm is pivotally supported up and down on the support column, and the arm is rotated by the drive motor to move the door body up and down to open and close the doorway and detect the rotation angle of the arm In the garage door with the means mounted on the column, the detection means comprises a case serving as an outer shell, a rotating body pivotally supported by the case, and a sensor that is fixed to the case and detects the rotation angle of the rotating body. A garage door characterized in that a pivot shaft is connected to the center of rotation of the rotating body via a fitting structure, and the case is attached to the support via an elastic support.   A rotating body is constituted by a meshing large-diameter gear and a small-diameter gear, a pivot shaft is connected to the rotation center of the large-diameter gear, and a rotation angle of the small-diameter gear is detected by a sensor. Item 1. Garage door.   3. A garage according to claim 2, wherein a confirmation window through which a meshing portion between the large-diameter gear and the small-diameter gear can be seen is formed in the case, and a mark indicating a reference meshing position is provided on each of the large-diameter gear and the small-diameter gear. door.   The case of the detecting means is composed of a set of rotating body mounting plates of the same shape, and this set of rotating body mounting plates is arranged opposite to each other with a spacer in between, and the opposing set of rotating body mounting plates is opposed to each other. A large-diameter gear bearing portion and a small-diameter gear bearing portion are provided at a position, and the large-diameter gear is pivotally supported between a pair of opposed large-diameter gear bearing portions, and a pair of opposed small-diameter gears having the same shape. The garage door according to claim 2, wherein a small-diameter gear is pivotally supported between the bearing portions for use.

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