JP2020016071A - Folding door bearing - Google Patents

Abstract

To provide a folding door bearing capable of minimizing a dead space formed at an entrance of a storage chamber when a folding door is fully opened.SOLUTION: A folding door bearing mounted inside a guide rail of a folding door frame is configured to include a suspension part 3 for guiding a pivot shaft on a folding door suspension side urged by a spring, a shaft hole 7 for supporting the pivot shaft, a bolt hole 8 for passing a fastening bolt 4, and a nut 5 supported by the guide rail for screwing the fastening bolt 4. The shaft hole 7 and the bolt hole 8 are formed in a main body 2, the main body 2 is fixed to the guide rail by fastening bolt 4 and nut 5, the hanging part 3 is constituted as a member independent from the main body 2, the main body 2 is mounted inside a folding door suspension original side of the guide rail, and the hanging part 3 is detachably connected to the main body 2.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a bearing for a folding door opening / closing device installed in an opening of a closet, a bathroom, or the like, and more specifically, a pivot shaft which is attached to an end of a guide rail of a folding door frame and is capable of sliding in the axial direction on the hanging side of the folding door. The present invention relates to a supporting folding door bearing.

  At least one of the pivot shafts provided at the upper part and the lower part on the hanging side of the folding door is slidably incorporated in the case buried in the door plate in the axial direction (direction perpendicular to the longitudinal direction of the guide rail), and is urged by a spring from the case. It is held at a position projecting a predetermined amount.

  By compressing the spring, the pivot shaft urged by the spring can be immersed in a hole in which the shaft is built (in the present invention, this is called a built-in hole).

  An axially slidable pivot shaft biased by the spring is guided by a suspension portion (also referred to as a pivot guide portion) having a sloped guide surface and inserted into a shaft hole of the bearing.

  When being guided by the guide groove of the suspension portion, the pivot shaft passes through the guide groove while compressing the spring and immersing in the mounting hole. When it reaches the inlet of the shaft hole, it is pushed out of the mounting hole by the force of the spring and fitted into the shaft hole.

  For example, as shown in Patent Literatures 1 to 3 below, the hanging portions are all integrally formed with the main body of the bearing having the shaft hole in conventional folding door bearings.

Japanese Utility Model Publication No. 06-56430 JP-A-09-256717 JP-A-2004-225245

  A conventional folding door bearing in which a hanging portion for guiding an axially slidable pivot shaft urged by a spring into a shaft hole of the bearing is formed integrally with the main body of the bearing is a door that is guided by a guide rail. The movement of the guide runner on the leading side to the hanging side is regulated by the hanging portion.

  As the guide runner 26 (see FIGS. 12 and 15) on the door end side, a shaft having a flange and not protruding and retracting is used. For this reason, as shown in FIG. 16, when the folding door 23 is opened and the guide runner 26 moves to the installation point of the hanging section 3, the hanging section 3 becomes an obstacle, and the guide runner 26 is further suspended. Movement to the side is blocked.

  In this state, the door-side door plate 23b is not properly folded over the hanging-side door plate 23a of the folding door 23. For this reason, the ratio of the dead space ds occupying the entrance of the storage room becomes large, and especially in the case of the folding door opening / closing device installed in the storage room having a small entrance size, the folding door 23 is in the way, so that articles can be taken in and out of the storage room. There is concern that it will be difficult.

  Therefore, an object of the present invention is to provide a folding door bearing in which a dead space at the entrance of the storage room when the folding door is fully opened is reduced to a minimum.

In order to solve the above problems, in the present invention, a folding door bearing mounted inside a guide rail of a folding door frame is configured as follows.
That is, a hanging portion that guides the pivot shaft on the side of the hanging door that can be slid in the axial direction urged by the spring while being immersed in the installation hole, and a shaft hole that fits and supports the guided pivot shaft. A bolt hole for passing a fastening bolt, and a nut supported by the guide rail and screwed into the fastening bolt.

Further, the shaft hole and the bolt hole are formed in a main body of the bearing, and the main body is formed on a surface on an opening side of the rail groove of a ridge provided opposite to both side surfaces of a rail groove of the guide rail. The main body is fixed to the guide rail by the fastening bolt and the nut in a state where the nut is supported on the surface on the groove bottom side,
Furthermore, the hanging portion is configured as a member independent of the main body, the main body is mounted inside the folding door hanging side of the guide rail, and the hanging portion is detachably connected to the main body. I made it.

This folding door bearing preferably uses a combination of the following configurations 1) and 2).
1) an upright portion having a width smaller than that of the flat plate portion, wherein the main body is connected to the flat plate portion which fits into the rail groove by being bent at 90 ° to a widthwise center portion of the flat plate portion on the door side; Wherein the shaft hole is formed near an end of the flat plate portion on the door end side, and the bolt hole is formed near an end of the flat plate portion on the hanging side.

2) The hanging portion is positioned at a position where the hanging portion abuts against the end face of the upright portion of the main body, and the hanging portion is locked to the main body or the guide rail and at a position where the positioning portion abuts against the end surface of the upright portion. A guide groove having a slope guide surface from a groove bottom of the rail groove to a surface of the flat plate portion of the main body where the shaft hole is opened, and a state in which the guide groove is inserted into the rail groove. And a knob protruding to the outside of the guide rail.

  It is preferable that two sets of the knobs are provided on the left and right of the portion where the guide groove is installed.

  The folding door bearing according to the present invention includes an L-shaped stopper having a flat plate portion to be attached to the flat plate portion of the main body, and a locking portion for locking to an end of the guide rail on the hanging side. The fastening tool may be provided with an elongated hole extending in the longitudinal direction of the guide rail so that the fastening bolt is loosely fitted in the elongated hole.

  In the folding door bearing according to this aspect, it is preferable that the retaining member is attached to a surface of the flat plate portion of the main body facing the groove bottom of the rail groove so that the main body and the nut are not pinched.

  The hanging portion detachable from the main body is connected to the main body in advance when the main body is mounted on the guide rail, so that the pivot shaft can be hung. After the main body is mounted on the guide rail, the pivot shaft can be suspended by connecting the main body to the main body.

  Further, when the suspension of the pivot shaft is completed, it is preferable to remove the suspended portion from the main body. If there is no particular problem with the hanging portion, the hanging portion can be left without being removed.

  ADVANTAGE OF THE INVENTION The folding door bearing of this invention makes it possible to remove the hanging part which guides the pivot shaft biased by the spring into the shaft hole of the main body from the main body.

  By removing the hanging portion, the dead space at the entrance of the storage room when the folding door is fully opened can be reduced by eliminating the restriction on the movement of the door-side guide runner by the hanging portion. Therefore, the folding door is not in the way, and it is easy to put articles in and out of the storage room.

  Further, the main body includes the flat plate portion and the upright portion, and the suspension portion includes the positioning portion, the coupling tool, the guide groove, and the knob portion. Easy to do.

  When the knobs are provided on the left and right sides of the guide groove, the hanging portion is easily pinched, and the work of connecting the hanging portion to the main body and the work of disconnecting the hanging portion from the main body are easy.

  In addition, the following effects can be obtained by using the retaining tool. Although the fastener is not an essential element, in a bearing without a fastener, the position of the main body shifts to the door end side when the tightening by the fastening bolt is loosened, whereby the folding door tilts, and the pivot on the hanging side side It is conceivable that the shaft comes off from the shaft hole of the main body and the folding door falls down.

  On the other hand, when the main body is provided with the retaining member, the main body is retained by the retaining member stopped by the guide rail when the main body is displaced toward the door end due to loosening of the fastening bolt.

  As a result, the amount of movement of the main body is limited to the range of accommodation in the longitudinal direction of the guide rail generated between the elongated hole provided in the fastener and the fastening bolt passed through the elongated hole, and the folding door can be securely tilted. Is prevented.

It is the perspective view seen from the hanging origin side of the folding door which shows an example of the folding door bearing of this invention in the state attached to the guide rail. It is the perspective view which looked at the mounting state of FIG. 1 from the door front side of a folding door. It is a perspective view which shows the bearing for folding doors of FIG. 1 in the state removed from the guide rail. FIG. 2 is an exploded perspective view showing a main body, a hanging portion, a fastening tool, a fastening bolt, and a nut of the folding door bearing of FIG. 1. It is sectional drawing which shows the state which mounted the bearing for folding doors of FIG. 1 on the guide rail. FIG. 6 is a sectional view taken along line XX of FIG. 5. It is a bottom view which shows the state which mounted the bearing for folding doors of FIG. 1 on the guide rail. FIG. 8 is an enlarged view of a region surrounded by a chain line frame in FIG. 7. It is sectional drawing which shows the other example of the connection structure of the hanging part with respect to a main body. It is sectional drawing which shows another example of the connection structure of the hanging part with respect to the main body. It is an image figure of a folding door opening and closing device. It is a front view which shows the component of a folding door opening / closing apparatus. It is a perspective view which shows the state which removed the hanging part of the pivot shaft of the upper side of the hanging origin side, and the bearing for folding doors which supports the pivot shaft. FIG. 5 is a perspective view of a lower pivot shaft on a hanging side and a bearing that supports the pivot shaft. It is a perspective view of the door-side guide runner of a folding door. It is explanatory drawing of the dead space of the storage room entrance when the movement of the door tip side guide runner to the hanging side is regulated by the hanging part. It is explanatory drawing of the dead space of the storage room entrance when the movement of the door tip side guide runner to the hanging side is not regulated by the hanging part.

  An embodiment of a folding door bearing according to the present invention will be described with reference to FIGS.

  11 to 15 show the outline of the folding door opening and closing device. As shown in detail in FIG. 12, the illustrated folding door opening and closing device 20 includes a folding door frame 21, a folding door 23, pivot shafts 24 and 25, a guide runner 26, a bearing 1, and a bearing 27.

  The folding door frame 21 has a pair of opposed guide rails 22 on the upper side and the lower side. In addition, the folding door 23 has a hinge 23c for connecting the hanging side door plate 23a, the door end side door plate 23b, and both door plates.

  Each guide rail 22 has rail grooves 22a opened in opposite directions. The rail groove 22a of the upper guide rail 22 has a downward opening as shown in FIGS. 1 to 3 and FIGS.

  On both side surfaces of the rail groove 22a, ridges 22b (see FIGS. 2, 3, and 6) extending in the rail longitudinal direction are provided to face each other.

  As shown in FIG. 12, the pivot shaft 24 is attached to the upper part of the hanging side door plate 23a, and the pivot shaft 25 is attached to the lower part of the hanging side door plate 23a.

  The guide runners 26 are attached to upper and lower portions of the door-side door plate 23b, respectively. The bearing 1 supports the upper pivot shaft 24, and the bearing 27 supports the lower pivot shaft 25.

  The pivot shaft 24 is incorporated in a cylindrical case 28 (see FIGS. 12 and 13) embedded in the hanging side door plate 23a. A spring (not shown) is housed in the cylindrical case 28.

  The pivot shaft 24 is urged by the spring in a direction protruding from the cylindrical case 28. Further, the pivot shaft 24 is restricted by the cylindrical case 28 so as to be protruded, and is held within the protruded range.

  In the folding door opening / closing device 20 shown in FIG. 12, the pivot shaft 24 is a movable shaft biased by a spring. The bearing 1 that supports the pivot shaft 24 (in FIGS. 12 and 13, the hanging portion 3 described below is removed) is the folding door bearing of the present invention.

  As shown in detail in FIGS. 3 and 4, the illustrated folding door bearing 1 is composed of a main body 2, a hanging portion 3 processed separately from the main body, a fastening bolt 4, a nut 5, and a fastener 6. ing.

  The main body 2 shown in FIGS. 1 to 7 is formed of metal. The main body 2 has a flat plate portion 2a attached to the surface of the ridge 22b on the rail groove opening side, and an upright portion 2b (see FIGS. 4 and 5). The flat plate portion 2a has a width W shown in FIG. 6 slightly smaller than the width of the rail groove 22a of the guide rail 22, and fits into the rail groove 22a.

  The upright portion 2b is bent at 90 ° to the widthwise central portion of the door end side end of the flat plate portion 2a so as to be continuous. The upright portion 2b has notches on both sides and is narrower than the flat plate portion 2a.

  A shaft hole 7 is formed near the end of the flat plate portion 2a on the door tip side, and a bolt hole 8 (see FIGS. 4 to 6) is formed near the end of the flat plate portion 2a on the hanging side. ing.

  The suspension section 3 is formed of a hard resin. The hanging portion 3 has a positioning portion 3a, a connecting tool 3b, a guide groove 3c, and a knob 3d shown in FIGS. The positioning part 3a is abutted on the end face of the upright part 2b of the main body 2.

  The illustrated connector 3b is a pair of left and right holding pieces extending toward both sides of the main body 2 from both sides of the positioning portion 3a. Protrusions 9 (see FIGS. 4 and 8) are provided facing the inner surfaces (opposing surfaces) of the pair of holding pieces.

  As shown in FIGS. 7 and 8, the connecting tool 3 b (left and right holding pieces) is elastically hugged by the upright portion 2 b of the main body 2.

  A plurality of hemispherical ones may be interspersed with the convex part 9, but a semi-cylindrical one as shown in the figure is preferable. The semi-cylindrical convex portion 9 extends in the up-down direction, and this convex portion 9 is along the edge of the upright portion 2b and is engaged with a surface facing the hanging side of the upright portion 2b.

  Due to the locking, the connection of the hanging portion 3 to the main body 2 is stabilized. When the convex portion 9 has a semi-cylindrical shape as shown in the drawing, a wide engagement region with the upright portion 2b is ensured, and the holding stability of the hanging portion 3 is enhanced.

  The guide groove 3c has a sloped guide surface gf extending from the groove bottom of the rail groove 22a of the upper guide rail 22 to the lower surface of the main body 2 (the shaft hole 7 is opened on this lower surface). As can be seen from FIG. 5, the guide surface gf is located at a position where the start end is connected to the groove bottom of the rail groove 22 a of the upper guide rail 22 and the end is connected to the lower surface of the main body 2.

  Even though the number of the knobs 3d is one, the purpose of installation is achieved. However, in the illustrated folding door bearing 1, a preferable configuration is such that the two knobs 3d form a pair on the left and right sides of the guide groove 3c. It is provided in.

  The left and right knobs 3 d protrude below (outside) the upper guide rail 22 in a state in which the suspension 3 is connected to the main body 2. For this reason, the hanging portion 3 is coupled to the main body 2 and the coupling is released (detached) by pinching it with a finger or pressing the lower surface of the knob portion 3d with a fingertip to apply a sliding force in the longitudinal direction of the guide rail. be able to.

  The hanging part 3 configured as described above is connected to the main body 2 by pushing the connecting tool 3b toward the main body 2 until the positioning part 3a hits the standing part 2b of the main body 2 with the standing part 2b interposed therebetween. You.

  On the other hand, the connection with the main body 2 is released by pulling in the direction away from the main body 2, and the connection to the main body 2 and the release of the connection are simple.

  The connection of the hanging portion 3 to the main body 2 may be performed at any time before or after the main body 2 is mounted on the upper guide rail 22.

  The connection of the hanging part 3 to the main body 2 may be performed by providing the hanging part 3 with the connecting tool 3b shown in FIG. 9 instead of the connecting tool 3b described above.

  9 is constituted by a single connecting piece having a convex portion 10. The connector 3b shown in FIG. 9 extending from the upper end of the positioning portion 3a toward the hanging side is inserted between the protruding end of the upright portion 2b of the main body 2 and the groove bottom of the rail groove 22a of the upper guide rail 22. Then, at the insertion end point, the convex portion 9b is engaged with the edge of the protruding end of the upright portion 2b on the hanging side, so that the connected state of the hanging portion 3 to the main body 2 is maintained.

  The connection of the hanging portion 3 to the main body 2 may be performed by providing a connecting tool 3b as shown in FIG. The connecting tool 3b of FIG. 10 is configured by providing a convex portion 11 on the outer surface of the side wall of the portion of the hanging portion 3 having the guide groove 3c.

  The protruding portion 11 (connector 3b) is engaged with the edge of the protruding end of the protruding ridge 22b on the bottom side of the rail groove, and the inserted state of the hanging portion 3 with respect to the rail groove 22a is maintained. Are indirectly connected via the guide rails 22.

  The fastening bolt 4 is passed through a bolt hole 8 provided in the main body 2 and screwed into a nut 5 supported by an upper guide rail 22.

  The nut 5 (the plate nut in the figure) is inserted into the inside (rail groove) of the upper guide rail 22, and by tightening the fastening bolt 4, the nut 5 is placed on the upper surface of the ridge 22 b and the main body 2. Are pressed against the lower surfaces of the ridges 22b, respectively, so that the main body 2 and the nut 5 are fixed to the upper guide rail 22.

  The retaining tool 6 is an L-shaped metal plate as shown in FIG. 4, and has a flat plate portion 6a and an upright engaging portion 6b. The flat plate portion 6a is attached to the upper surface of the flat plate portion 2a of the main body 2. The locking portion 6b is bent at 90 ° and connected to the end of the flat plate portion 6a on the hanging side.

  As can be seen from FIG. 6, the width of the flat plate portion 6a of the fastener 6 is smaller than the dimension between the left and right ridges 22b inside the upper guide rail 22. Further, the thickness of the flat plate portion 6a is smaller than the thickness of the ridge 22b.

  The flat plate portion 6a is inserted between the protrusions 22b on the inner surface of the side wall of the upper guide rail 22. As a result, the flat plate portion 6a is concealed by the main body 2, and the bearing has a clear appearance.

  The flat plate portion 6a is provided with an elongated hole 12 (see FIGS. 4, 5, and 7) extending in the longitudinal direction of the guide rail. The elongated hole 12 is passed through the bolt hole 8 of the main body 2. The fastening bolt 4 is loosely fitted.

  As described above, since the thickness of the flat plate portion 6a is smaller than the thickness of the ridge 22b, interference with the tightening of the fastening bolt 4 (interference of the tightening due to the flat plate portion 6a being sandwiched between the main body 2 and the nut 5). ) Does not occur.

  Therefore, when the fastening bolt 4 is tightened, the main body 2 and the nut 5 are directly pressed against the ridge 22b of the upper guide rail 22 without being hindered by the fastener 6, and the surface pressure of the pressed portion is increased to fix the bearing. Becomes stable.

  As shown in FIGS. 3 and 4, the left and right edges of the retaining portion 6 b of the retaining member 6 project laterally, so that the left and right edges of the retaining portion 6 b are shown in FIGS. 1 and 7. As shown, the upper guide rail 22 can be brought into contact with the end on the hanging side. By this contact, the locking portion 6b is locked to the end surface of the upper guide rail 22 on the hanging side, and is prevented from moving to the door end side.

  The main body 2 and the retaining tool 6 are connected to the elongated holes 12 formed in the flat plate portion 6a when the retaining tool 6 is located at a position where the retaining portion 6b is retained on the end surface of the upper guide rail 22 on the hanging side. In order to allow the body 2 to move moderately toward the door-end side, there is provided a clearance between the bolt and the fastening bolt 4 loosely fitted in the elongated hole 12 (see FIG. 7).

  As a result, even if the main body 2 is displaced toward the door tip side due to loosening of the fastening by the fastening bolts 4, the main body 2 is retained by the retainer 6 at the position where the flexibility has been absorbed. Therefore, no further displacement of the main body occurs, and the folding door is securely prevented from falling due to the displacement of the bearing.

  The suspension of the upper pivot shaft 24 is performed by guiding the pivot shaft 24 by the suspension unit 3.

  The lower pivot shaft 25 of the folding door is inserted into the shaft hole of the bearing 27 fixed inside the hanging side of the lower guide rail 22, and in this state, the folding door 23 is inclined to pivot the pivot shaft 24 and the upper guide runner. 26 is inserted into the rail groove 22a of the upper guide rail 22. Then, the tilted folding door 23 is raised with the pivot shaft 25 as a fulcrum.

  As a result, the pivot shaft 24 rides on the guide surface gf of the guide groove 3c of the hanging portion 3, and is guided by the guide groove 3c to move to the hanging side.

  At this time, the pivot shaft 24 compresses the spring in the cylindrical case 28, passes through the guide groove 3c while immersing in the built-in hole, moves on to the main body 2 and reaches the inlet of the shaft hole 7, and moves inside the cylindrical case 28. And is inserted into the shaft hole 7 by the force of the spring.

  At that point, the hanging is completed, and the attachment of the folding door to the folding door frame is completed. When the work is completed, the hanging unit 3 is removed from the main body 2.

  When the hanging portion 3 is left at the connection position with the main body 2, as shown in FIG. 16, the hanging portion 3 becomes an obstacle, and the movement of the guide runner on the door side to the hanging source side is restricted. As a result, the dead space ds at the entrance of the storage room increases.

  On the other hand, when the hanging portion 3 is detached from the main body 2, the guide runner 26 on the door end side can move to the hanging side until it hits the upright portion 2 b of the main body 2 as shown in FIG. 17. Thus, the dead space ds at the entrance of the storage room is smaller than that in the case where the hanging portion 3 is left, so that articles can be easily taken in and out of the storage room.

  Data comparing the difference in the size of the dead space ds is shown below. The comparison of the size of the dead space was carried out using a folding door having a door width of 300 mm and 400 mm and a door thickness of 25 mm and 30 mm as an example.

  A guide rail having a length of about 30 mm in the longitudinal direction is used as the suspension portion 3, and a dead space is compared between the case where the suspension portion remains without being removed from the bearing and the case where the suspension portion is removed. did. The results are summarized in Table 1.

  In the folding door bearing of the present invention, by removing the hanging portion 3, the hanging portion 3 has no influence on the dead space.

  For this reason, the length of the suspension portion 3 in the longitudinal direction of the guide rail can be made sufficiently long so that the inclination angle of the guide surface gf of the guide groove 3c can be reduced, and the suspension of the pivot shaft biased by the spring can be performed by the main body. This is simpler than a conventional folding door bearing in which the hanging portion is integrally formed.

  Although the above description has been made with reference to an example in which the pivot shaft biased by the spring is provided at the upper part of the folding door, the present invention provides that the pivot shaft at the lower part of the folding door is biased by the spring. However, the present invention is also effective when applied to a bearing that supports a pivot shaft below the folding door.

DESCRIPTION OF SYMBOLS 1 Folding door bearing 2 Main body 2a Flat plate part 2b Standing part 3 Hanging part 3a Positioning part 3b Connector 3c Guide groove gf Guide surface 3d Knob part 4 Fastening bolt 5 Nut 6 Fastening tool 6a Flat plate part 6b Lock part 7 Shaft hole 8 Bolt holes 9, 10, 11 Convex portion 12 Long hole 20 Folding door opening / closing device 21 Folding door frame 22 Guide rail 22a Rail groove 22b Ridge 23 Folding door 23a Hanging source side door plate 23b Door end side door plate 23c Hinge 24 Upper pivot shaft 25 Lower side Pivot shaft 26 Guide runner 27 Lower bearing 28 Cylindrical case W Width ds of the main part of the folding door bearing Dead space

Claims (7)

A folding door bearing mounted inside a guide rail (22) of a folding door frame (21),
A pivot that is guided by a guide groove (3c) having an inclined guide surface (gf) to guide a pivot shaft (24) on a folding door hanging side that can be slid in an axial direction urged by a spring and that is guided into a mounting hole. (3), a shaft hole (7) for fitting and supporting the guided pivot shaft (24), a fastening bolt (4), and a bolt hole (8) for passing the fastening bolt (4). A nut (5) supported by the guide rail (22) and screwed into the fastening bolt (4);
The shaft hole (7) and the bolt hole (8) are formed in the main body (2) of the bearing, and are provided to extend in the rail longitudinal direction so as to face both side surfaces of the rail groove (22a) of the guide rail (22). The main body (2) is supported on the surface of the projected ridge (22b) on the opening side of the rail groove (22a), and the nut (5) is supported on the surface on the groove bottom side. ) Is fixed to the guide rail (22) by the fastening bolt (4) and the nut (5),
Further, the hanging portion (3) is configured as a member independent of the main body (2), and the main body (2) is mounted inside the guide rail (22) on the folding door hanging side, and the hanging A folding door bearing in which a portion (3) is detachably connected to the main body (2). The main body (2) is bent at 90 ° to a flat plate portion (2a) that fits into the rail groove (22a) of the guide rail (22) and a widthwise center portion of the flat plate portion (2a) on the door end side. An upright portion (2b) narrower than the flat plate portion (2a), and the shaft hole (7) is provided near an end of the flat plate portion (2a) on the door tip side, The bolt holes (8) are respectively formed near the ends of the flat plate portions (2a) on the suspension base side,
The hanging portion (3) is engaged with a positioning portion (3a) that abuts against an end surface of the upright portion (2b) of the main body (2), and is engaged with the main body (2) or the guide rail (22). A connector (3b) for temporarily holding the positioning portion (3a) at a position where the positioning portion (3a) is abutted against the end face of the upright portion (2b), and a groove bottom of a rail groove (22a) of the guide rail (22). A guide groove (3c) having an inclined guide surface (gf) reaching a surface of the flat plate portion (2a) of the main body (2) where the shaft hole (7) is opened, and inserted into the rail groove (22a). 2. The folding door bearing according to claim 1, further comprising: a knob portion (3 d) that protrudes outside the guide rail (22) when the guide rail is in the set state. 3.   A pair of left and right holding pieces that extend from both sides of the positioning portion (3a) toward the main body (2) side and hug the upright portion (2b); The folding door bearing according to claim 2, comprising a vertically extending semi-cylindrical convex portion (9) which is engaged with a surface facing the hanging side.   A connecting piece inserted between a protruding end of the upright portion (2b) of the main body (2) and a groove bottom of the rail groove (22a); and a connecting piece provided on the connecting piece. The folding door bearing according to claim 2, comprising a projection (10) which is engaged with an edge of the protruding end of the upstanding portion (2b) on a hanging side at an end point of insertion of the connecting piece.   The connecting tool (3b) is provided on an outer surface of a side wall of a portion having the guide groove (3c) of the suspension part (3), and a rail groove at a protruding end of a ridge (22b) of the guide rail (22). 3. The folding door bearing according to claim 2, further comprising a projection (11) that is locked to a bottom edge and holds the hanging portion (3) in a state of being inserted into the rail groove (22 a). 4.   An L-shape including a flat plate portion (6a) to be attached to the flat plate portion (2a) of the main body (2) and a locking portion (6b) for locking to a hanging end of the guide rail (22). The fastener (6) has a long hole (12) extending in the longitudinal direction of the guide rail, and the fastening bolt (4) is inserted into the long hole (12). The folding door bearing according to any one of claims 2 to 5, wherein the bearing is configured to be loosely fitted. The flat plate portion (6a) of the retaining member (6) has a width smaller than the dimension between the ridges (22b, 22b) provided on both side surfaces of the rail groove (22a) of the guide rail (22). The folding door bearing according to claim 6, wherein the thickness is smaller than the thickness of the ridge (22b).

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