JP4479274B2 - Garage door - Google Patents

Description

  The present invention relates to a garage door, and more particularly to a flip-up gate door technology.

  Conventionally, as shown in FIG. 12, the garage door 70 has a gate pole 75 rotatably mounted on a gate pillar 71, and the left and right gate pillars 71 are composed of a fixed pillar 72 and a movable pillar 73 that can be raised and lowered. The movable column 73 and the gate 75 are connected by an arm 74, and a configuration in which the gate 75 is flipped upward by rotating the arm 74 is disclosed in Patent Document 1.

  However, when the gate 75 is lowered, the gate 75 jumps out to the road side M by the length of the arm 74, so the gate column 71 is moved to the site side N so that the gate 75 does not jump out to the road side M. Needed to be installed. For this reason, there has been a problem that the effective site area is reduced by the amount of the gate pole 71 brought to the site side N. In addition, there is a problem that the passage is blocked by the arm.

  For this reason, if the arm 74 is shortened so as not to reduce the site area as much as possible, the space height from the ground to the gate door 75 is lowered with the gate 75 raised, and it becomes impossible to store a vehicle with a high vehicle height. was there.

Therefore, as shown in FIG. 13, in order to prevent the gate 78 from jumping out to the road side M, the gate 78 can be moved up and down by a drive motor 79 inside the portal frame composed of the left and right support columns 76 and the cross beam 77. The structure which arrange | positions and rotates the gate door 78 toward the site side N in a raise position is disclosed by patent document 2. FIG.
Japanese Utility Model Publication No. 3-57300 JP-A-7-62962

  However, in the garage door disclosed in Patent Document 2, the gate frame support column 76 and the horizontal girder 77 are large and the gate opening / closing space is not compact, and the mechanism for moving the gate column up and down is minute deformation due to column dimensional accuracy and temperature changes. There was a problem that the column could not be raised and lowered smoothly.

  SUMMARY OF THE INVENTION Accordingly, the present invention has an object to eliminate a gate from jumping out to the road side at the time of opening and closing, to obstruct passage by an arm, to eliminate a cross beam, and to be compact.

  An object is to provide a garage door that is easy to construct and low in cost.

  Furthermore, it aims at providing the garage door which can respond to the dimensional accuracy of a pillar, the micro deformation | transformation by a temperature change, etc., and can raise / lower smoothly.

  It aims at providing the garage door which can be rotated stably at the time of gate rotation.

    According to the first aspect of the present invention, a pair of gate columns each including a fixed column and a movable column surrounding the fixed column are formed, a driving means for driving the movable column upward and downward along the fixed column, and a pair of movable columns. A garage door with a flip-up type gate that moves up and down in conjunction with gate door rotating means for rotating the entire gate to the site side at a predetermined ascending position of the movable column and slidingly supporting the movable column A first roller portion and a second roller portion are arranged around the fixed column, and the first roller portion and the second roller portion have a prospective direction perpendicular to the surface of the gate and the gate door. Means for providing at least one set of rollers on each of the four surfaces in the direction of finding that is horizontal along the surface, and imparting elasticity to the rollers on the surface that does not receive a load from the gate when the gate is raised or lowered It is characterized by providing.

  For this reason, the gate does not jump out to the road side when opening and closing. Elasticity is applied to the roller on the surface that does not receive an external load, so that the movable column can cope with dimensional accuracy, minute deformation due to temperature change, and the like.

  Invention of Claim 2 is the garage door of Claim 1, Comprising: A 1st roller part is attached to the upper end part of the said fixed pillar, and a 2nd roller part is carried out below predetermined length from the upper end part of the said fixed pillar. It is characterized by providing.

  For this reason, the movable column is stabilized by the two roller portions.

Invention of Claim 3 is the garage door of Claim 1, Comprising: The 1st roller part was provided in the upper end part of the said fixed pillar , and the 2nd roller part was provided in the lower end part of the said fixed pillar , It is characterized by the above-mentioned. It is said.

  For this reason, the attachment distance of two roller parts can be lengthened.

  According to the first aspect of the present invention, a gate rotating means for rotating the entire gate to the site side at a predetermined rising position of the movable column is provided, and the first roller portion and the second roller for slidingly supporting the movable column are provided. A roller portion is disposed around the fixed column, and the first roller portion and the second roller portion have a prospective direction that is perpendicular to the surface of the gate and a direction that is horizontal along the surface of the gate. Each of the four surfaces is provided with at least one set of rollers on each surface, and means for imparting elasticity to the rollers on the surface that does not receive a load from the gate when the gate is moved up and down.

  For this reason, the gate does not pop out to the road side at the time of opening and closing, it is possible to eliminate the traffic obstruction by the arm, and it can be made compact, so that a garage door that is easy to construct and low in cost can be obtained. Since the roller on the surface that does not receive an external load is provided with means for urging elasticity, the movable column can cope with dimensional accuracy, minute deformation due to a temperature change, and the like, and can move up and down smoothly. The movable column can be moved up and down stably and smoothly by the two roller parts. The movable column can be moved up and down stably and smoothly even when the gate is rotated by the two roller parts.

  According to the second aspect of the present invention, the first roller portion is provided at the upper end portion of the fixed column, and the second roller portion is provided at a predetermined length below the upper end portion of the fixed column.

  For this reason, the movable column can be moved up and down stably and smoothly by the two roller portions. The movable column can be moved up and down stably and smoothly even when the gate is rotated by the two roller parts.

According to the third aspect of the present invention, the first roller portion is provided at the upper end portion of the fixed column , and the second roller portion is provided at the lower end portion of the fixed column .

  For this reason, since the attachment distance of the two roller parts becomes long, the movable column can be moved up and down more stably and smoothly. The movable column can be moved up and down stably and smoothly even when the gate is rotated by the two roller parts.

<First embodiment>
<Composition of the garage door>
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1A, 1 </ b> B, and 1 </ b> C, the garage door 1 according to the present embodiment includes a pair of gate columns 4 including a fixed column 2 and a movable column 3 surrounding the fixed column 2. A garage door 1 having a driving means 5 for driving the movable column 3 upward and downward along the fixed column 2 and a flip-up type gate 6 that moves up and down in conjunction with the pair of movable columns 3, A link mechanism 8 is provided as a gate rotating means for rotating the entire gate 6 to the site side N at a predetermined ascending position of the movable column 3, and a first roller unit 10 and a second roller unit that slide-support the movable column 3. A roller portion 11 is disposed around the fixed column 2, and a prospective direction S perpendicular to the surface 7 of the gate 6 of the first roller portion 10 and the second roller portion 11 and the surface 7 of the gate 6. If at least one set of rollers 12 is provided on each of the four surfaces in the direction of finding T that is horizontal along Moni, provided with means (biasing means 50 with elasticity) to impart elasticity to the roller 12 of the receiving no surface load from the gates 6 during vertical movement of the gates 6.

  The link mechanism 8 as a gate rotating means is constituted by an arm 15 and a sub arm 16 and rotates and flips up the gate 6.

The fixed column 2 is formed in a square cylinder shape in plan view, and is stored inside the movable column 3 that is slightly larger than the fixed column 2. Furthermore, since the decorative column 13 covers the movable column 3 (the decorative column 13 covers the movable column 3 at the lower limit position, and the decorative column 13 is fixed to the lower portion of the fixed column 2), the movable column 3 rises. Even when the gate 6 jumps up and is in the state shown in FIG. 1B, the situation of the link mechanism 8 and the like around the fixed column 2 cannot be seen from the outside, and externally, the state when the gate 6 is fully closed (The state of FIG. 1A ).

As shown in FIGS. 2A and 2B, the link mechanism 8 includes an arm 15 and a sub arm 16. (In the figure, the fixed column 2 and the decorative column 13 are omitted.)
The shape of the arm 15 is an elongated rectangular plate, and one end portion 15a is rotatably connected and supported by a fixed pin 15c fixed to the upper end portion 3a of the movable column 3.

  The sub arm 16 is a long and narrow rectangular plate provided on the side surface of the gate door 6, and a long hole 16a is provided in the longitudinal direction in a region of about 1/3 of the central portion. A movable pin 15d that is slidably fitted in the vertical direction is inserted into the long hole 16a, and the other end portion 15b of the arm 15 is connected to the movable pin 15d. As described above, the entire gate 6 is configured to be suspended from the movable column 3 via the sub arm 16, the movable pin 15d, the arm 15, and the fixed pin 15c.

  Thus, the arm 15 can freely rotate about the axis of the fixed pin 15c, and the sub arm 16 can freely rotate about the axis of the movable pin 15d and can move in the vertical direction with respect to the movable pin 15d.

Next, the drive system 18 that slides and raises the gate 6 includes two wires 18a and 18b. For example, a belt-shaped steel wire or the like is used. One wire 18a is fixed at one end to a fixing portion 19 provided at the upper portion of the fixed column 2 shown in FIG. 1, and from the fixed portion 19 to a lower arm of the gate 6 via a pulley 20 provided at the upper portion of the movable column 3. 16 is fixed to a connecting pin 16b provided on a lower end member 41 (see FIG. 5 and FIG. 6) fixed to 16. One end of the other wire 18 b is fixed to the fixing portion 19 and is fixed to the connecting pin 16 b via a pulley 21 provided at the lower portion of the movable column 3. As a result, the gate 6 is suspended and supported by the fixing portion 19 of the fixed column 2 shown in FIG. 1 through the drive system 18 that is fixed to the connecting pin 16b.

  As shown in FIG. 2 (c), when the movable column 3 is in the lower limit position, the connecting pin 16 b at the lower end of the gate 6 (sub arm 16) is positioned in the vicinity of the pulley 21 below the movable column 3.

As shown in FIG. 2D, when the movable column 3 starts to rise in the direction of the arrow by the driving means 5 shown in FIG. 4, the ends of the wires 18a and 18b are fixed by the fixing portion 19, so that the wire The connecting pin 16b is pulled up by 18a and 18b, and the gate 6 is raised following the movable column 3.

  At this time, the gate 6 also rises in conjunction with the rise of the movable column 3, but the raising speed of the gate 6 is faster than that of the movable column 3. That is, when the movable column 3 rises by V, the pulley 21 also rises by V. At this time, since the wires 18a and 18b are closed loops with one ends fixed to the fixed portion 19, the pulley 21 serves as a moving pulley. Therefore, the length U of the wire 18b necessary for the pulley (moving pulley) 21 to rise V is U (≈2 × V). Thus, since the wire moves in the upward direction by the length U, the connecting pin 16b also rises by the length U.

  As the connecting pin 16b is raised, the gate 6 integrated with the connecting pin 16b is also raised by the length U, so that the gate 6 can be raised with a movement stroke approximately twice that of the movable column 3.

  Operation | movement at the time of opening the gate 6 is demonstrated using Fig.3 (a)-(f). 3 (a) and 3 (b) are the same as those described in FIG. Further, the reference numerals are attached to FIGS. 3C and 3E, but the same applies to other drawings.

As shown in FIGS. 3C and 3D, when the movable column 3 is driven upward by driving the drive motor 30 shown in FIG. 4 from the fully closed state of FIG. The movable pin 15d of the link mechanism 8 is relatively lowered along the elongated hole 16a provided in the sub arm 16 until the gate 6 reaches the predetermined ascending position. Go up.

  The lower end of the gate 6 is connected to the wire 18b in a suspended support state via the connection pin 16b, but the gate 6 is in a state of being rotatable around the connection pin 16b at the lower end. From the lower limit position to the predetermined ascending position, it is necessary to hold the gate 6 so that it does not rotate during ascent. Therefore, while the link mechanism 8 is sliding, the gate 6 is guided by a gate guide (not shown) attached to the movable column 3 so as not to rotate, and the gate 6 can be raised on the vertical line.

  In addition, a trigger (not shown) for tilting the gate 6 in the rotation direction when the gate 6 starts to rotate after being lifted is provided at a position below the center in the vertical direction of the gate 6, and the movable pin 15 d of the link mechanism 8 is provided. Immediately before reaching the lower end of the long hole 16a, a roller (not shown) arranged inside the movable column 3 comes into contact with a trigger (not shown) so that the gate 6 starts to rotate.

  Thereby, following the ascent of the movable column 3, the gate 6 continues to rise and tilt toward the site N by the link mechanism 8.

  As shown in FIGS. 3 (e) and 3 (f), the gate 6 is further raised after the movable pin 15d of the link mechanism 8 reaches the lower end of the long hole 16a. Rotating toward N, the gate 6 is finally fully lifted up to the site side N above the movable column 3. At this time, the load of the gate 6 is supported in a well-balanced manner using the link mechanism 8, so that the gate 6 is stopped and held in a fully opened state. The gate can be closed by the reverse operation (FIG. 3 (f) → (a)).

  As shown in FIG. 4, the driving means 5 for driving the movable column 3 upward includes a drive motor 30 built in the fixed column 2 and a chain sprocket type for transmitting the power of the drive motor 30 to the movable column 3. And a rack and pinion gear type drive transmission mechanism 31.

  The drive transmission mechanism 31 includes a sprocket 32 attached to a drive motor 30 built in the fixed column 2 and a chain 33 disposed inside the movable column 3 and mounted in the vertical direction of the movable column 3. When the sprocket 32 is rotated by the drive motor 30, the movable column 3 is driven in the vertical direction with respect to the fixed column 2 by the meshing of the sprocket 32 and the chain 33. Reference numeral 65 denotes an outer wall.

As shown in FIGS. 5 and 6, a driving motor 30 is attached to the upper part of the fixed column 2 and the gate 6 is moved in the vertical direction in conjunction with the movable column 3 shown in FIG. Can be driven.

  A first roller portion 10 and a second roller portion 11 are provided on the upper portion of the fixed column 2 so that the movable column 3 can be moved up and down smoothly with respect to the fixed column 2. The second roller portion 11 is provided with a total of eight rollers 12 that rotate about the horizontal axis on the four side surfaces over two layers.

In addition, in order to stabilize the raising and lowering of the movable column 3 shown in FIG. 1, a roller (not shown) is separately arranged on the center side in the vertical direction of the fixed column 2 and a guide groove (not shown) that guides the roller in the vertical direction is movable. It is preferable to provide on the inner surface of the column.

Lower member 41 disposed on a lower portion of the gates 6, is connected to the movable pole 3 shown wire 18a via a connecting pin 16b and the sliding roller unit 40 shown in FIG. 2, by 18b in FIG. 1 in a suspension support state Yes. The connecting pin 16b and the sliding roller portion 40 are inserted into the recesses provided in the movable column 3 shown in FIG. 1 and can slide up and down.

  As shown in FIG. 7, a first roller portion 10 and a second roller portion 11 that facilitate sliding of the movable column 3 are arranged on the upper end portion of the fixed column 2 vertically at predetermined intervals, respectively. In the first roller portion 10 and the second roller portion 11, elastic rollers 12a and (inelastic) rollers 12b are provided so as to face both side surfaces S1 in the prospective direction S and both side surfaces T1 in the finding direction T, respectively. Two sets are provided.

  The first roller portion 10 is composed of two layers of “A”-“A” cross section and “B”-“B” cross section, and the second roller portion 11 is formed of “C”-“C” cross section, “D”. It consists of two layers "-" D ".

  As shown in FIGS. 8 (a), (b), (c) and (d), the elastic rollers 12a and 12b are attached in opposite directions in FIGS. 8 (a) and 8 (c), respectively. 8B and 8D are also attached in the opposite directions. A spring 50 is attached to each elastic roller 12a.

  As shown in FIG. 9, the cylindrical roller 12 is mounted on the roller support 12 c, and a roller shaft 53 having a bearing fitted in the center of the roller 12 is inserted, and the roller holder 51 is cantilevered. . The roller holder 51 is formed by bending a rectangular plate into a substantially U shape, and a hole 53a for holding the roller shaft 53 is formed on one side wall. Further, a fixing for attaching a spring 50 as an elastic material is provided at the center of the bottom of the U shape. A hole 58 for screwing and fixing the pin 59 is formed toward the center of the roller shaft 53.

  On the other hand, the roller box 52 for attaching the fixing pin 59 of the spring 50 is formed by bending a substantially T-shaped plate 57 corresponding to the T-shaped horizontal line by 90 degrees on both wings, and slightly remaining the material end at the tip. The portion is further bent 90 degrees in the same direction to form a space 57a surrounded in three directions. A plate below the plate 57 at a portion corresponding to the T-shaped vertical line is bent 90 degrees in the same direction as above to form a plate 56, and a plate parallel to the plate 56 at an intermediate portion between the plate 56 and the plate 57. Cut out 3 sides and fold it 90 degrees to make 54. At this time, an opening 55 remains in the trace where the plate 54 has been removed.

  In this manner, the colo box 52 is formed in a substantially rectangular parallelepiped outer shell shape in which the space 57a, the plate 54, and the plate 56 are continuously connected.

  In this way, the fixing pin 59 inserted into the hole 54 a provided at the center of the plate 54 of the roller box 52 is fixed to the hole 58 of the roller holder 51 after covering the fixing pin 59 with the spring 50. Accordingly, the roller support 12c is configured in which the roller holder 51 is slidably mounted in the space 57a.

  The roller support 12c can be fixed at a predetermined location using a hole 56a provided at the center of the plate 56. In addition, the roller support 12c not equipped with the spring 50 as an elastic material has the same structure except for the member related to the spring 50.

<Action of the garage door>
When the sprocket 32 is rotated by the drive motor 30, the movable column 3 rises with respect to the fixed column 2 due to the meshing of the sprocket 32 and the chain 33. When the movable column 3 rises, one end of the wires 18a and 18b is fixed to the fixing portion 19, so that the connecting pin 16b is pulled up by the wires 18a and 18b, and the gate 6 follows the movable column 3 and rises. Let The movable pin 15d of the link mechanism 8 is relatively lowered along the long hole 16a of the sub arm 16 until the movable column 3 reaches a predetermined ascending position from the lower limit position. It goes up (see FIGS. 3A to 3C). Then, immediately before the movable pin 15d reaches the lower end of the long hole 16a, the gate 6 is tilted and rotated toward the site side N, and finally the gate 6 is moved to the site side N at a position above the movable column 3. The fully opened state is flipped up (see FIGS. 3D to 3F). Therefore , the gate 6 can be opened and closed without jumping to the road side, and the opening and closing space of the gate 6 can be made compact.

  In addition, the gate 6 does not protrude to the site immediately after the start of ascent, and there is no need to provide a space for the gate 6 in the site.

  A conventional disturbing arm or cross beam is not required, and only a pair of left and right gate pillars 4 are required. As a result of making the garage door 1 compact, construction is facilitated and costs can be reduced.

As shown in FIG. 10, when a gate (not shown) starts to rotate, a moment M1 is applied to the movable column 3 to fall on the site side N. Therefore, the roller in the cross section L1 shown in FIGS. 8 (a) and 8 (c). 12 positions are respectively 61, 62, 63 and 64 from the site side N, and when the force P1 applied to one roller 12 is obtained, the rollers 12 are two on each side.
P1 = M1 / (L1 × 2).

  Here, the force P1 is handled at the position 62 and the position 63, but it is not applied to the position 61 and the position 64, and it can be seen that a gap is generated.

  For this reason, the roller of the part to which the force P1 is applied is the (non-elastic) roller 12b, but the opposite side of the movable column 3 corresponding to the roller is the gap between the movable column 3 and the fixed column 2 In order to compensate for the above, an elastic roller 12a is arranged.

  As a result, the movable column 3 does not rattle or vibrate due to the gap.

  The elastic roller 12a can cope with dimensional accuracy and minute deformation due to temperature change (variation in dimensions) even in a state where the rotational moment M1 of the gate is not applied, so that it is possible to provide a garage door that can move up and down smoothly. .

  8B and 8D are effective in the finding direction T, but are not affected by the rotational moment of the gate 6 and are not normally loaded as a load. Since it is possible to cope with the dimensional accuracy of the columns and minute deformation due to temperature changes, it is possible to provide a garage door that has the same effect as the S direction and can be moved up and down smoothly.

  Furthermore, even if there is a disturbance such as wind, the elastic roller 12a acts as a shock absorber, and there is an effect that a sudden rattling is reduced.

<Second Embodiment>
As shown in FIG. 11 , the first roller portion 10 that makes the movable column 3 easy to slide is attached to the upper end portion of the fixed column 2, and the second roller portion 11 is attached to the lower end portion of the fixed column 2 . The first roller portion 10 and the second roller portion 11 have rollers 12 (elastic rollers 12a on both side surfaces S1 in the prospective direction S and both side surfaces T1 in the finding direction T in the same manner as in the first embodiment. And rollers 12b) are respectively provided. That is, the attachment structure of the first roller portion 10 and the second roller portion 11 is the same as that of the first embodiment shown in FIG .

For this reason , since the backlash between the fixed column 2 and the movable column 3 can be absorbed from the time when the gate starts to rise, the movable column 3 can be moved up and down smoothly from the initial movement.

  As mentioned above, although embodiment of this invention was described based on drawing, all said Example showed an example of this invention, and it cannot be overemphasized that this invention should not be limited to these. Absent.

  For example, the moving stroke ratio between the gate 6 and the movable column 3 can be changed by adding a moving pulley in the middle of the wire.

  Instead of the belt-shaped steel wire, a normal round wire or fiber rope may be used. In that case, it is necessary to consider the strength, elongation or twist.

  The number and position of the rollers 12 are not limited. For example, one roller may be arranged on each of the four surfaces of each of the cross sections of the fixed column 2.

  Since the garage door 1 is symmetrical in the T direction and is symmetrical even when a load is applied in the T direction, the rollers in the cross section shown in FIGS. 8B and 8D are elastic rollers 12a and (non-elastic) rollers. The position of 12b may be switched.

BRIEF DESCRIPTION OF THE DRAWINGS (a) of the garage door in the 1st Embodiment of this invention is a perspective view which shows the fully closed state of a gate, (b) is a perspective view which shows the half open state of a gate, (c) shows the fully open state of a gate. It is a perspective view. The differential coupling mechanism of the garage door in the 1st Embodiment of this invention is shown, (a) is a side view in the fully closed state of a gate, (b) is a side view in the fully closed state of a gate, and slides a movable column. Explanatory drawing of the drive rope to raise, (c) is a side view in the fully closed state of a gate door, Explanatory drawing of a link mechanism and a drive rope, (d) is a side view in the half-open state of a gate door. (A)-(f) is explanatory drawing of a series of rotation states from the fully closed state of a gate to a fully open state. (A) of the drive means for movable pillars in the 1st Embodiment of this invention is a plane sectional view, (b) is a front sectional view. It is the see-through | perspective perspective view which looked at the fully closed state of the gate in the 1st Embodiment of this invention from the site side. It is the see-through | perspective perspective view which looked at the fully closed state of the gate in the 1st Embodiment of this invention from another angle on the site side. It is a perspective view of the upper part of a fixed pillar in the 1st Embodiment of the present invention. 7A is a cross-sectional view taken along line AA in FIG. 7, FIG. 7B is a cross-sectional view taken along line BB in FIG. 7, and FIG. 7C is a cross-sectional view taken along line CC in FIG. d) is a DD cross-sectional view of FIG. BRIEF DESCRIPTION OF THE DRAWINGS (a) of the roller support in the 1st Embodiment of this invention is an exploded perspective view, (b) is EE sectional drawing. It is a relation explanatory view of a rotation moment and a roller in the state where a gate rotates in a 1st embodiment of the present invention. It is explanatory drawing of the attachment position of a roller in the 2nd Embodiment of this invention. It is a perspective view of the 1st prior art example. (A) of a 2nd prior art example is a front view, (b) is a side view.

DESCRIPTION OF SYMBOLS 1 Garage door 2 Fixed pillar 3 Movable pillar 4 Gate pillar 5 Driving means 6 Gate door 7 Surface 8 Gate door rotation means 10 1st roller part 11 2nd roller part 12 Roller 12a Elastic roller 12b (inelastic) roller 60 With elasticity Force means S Expected direction S1 Both side surfaces T Finding direction T1 Both side surfaces

Claims (3)

A pair of gate columns consisting of a fixed column and a movable column surrounding the fixed column is formed, a driving means for driving the movable column upward and downward along the fixed column, and a flip-up that moves up and down in conjunction with the pair of movable columns A garage door with an expression gate,
A gate rotating means for rotating the entire gate to the site side at a predetermined rising position of the movable column is provided, and a first roller portion and a second roller portion for slidingly supporting the movable column are arranged around the fixed column. Established,
At least one set of rollers on each surface is formed on each of four surfaces including a prospective direction perpendicular to the surface of the gate of the first roller portion and the second roller portion and a finding direction that is horizontal along the surface of the gate door. A garage door provided with means for providing elasticity to the roller on a surface not receiving a load from the gate when the gate is moved up and down.   2. The garage door according to claim 1, wherein a first roller portion is provided at an upper end portion of the fixed column, and a second roller portion is provided at a predetermined length below the upper end portion of the fixed column. Garage door. 2. The garage door according to claim 1, wherein a first roller portion is provided at an upper end portion of the fixed column , and a second roller portion is provided at a lower end portion of the fixed column .