JP6755583B2 - Pivot hinge - Google Patents

Description

The present invention relates to a pivot hinge in which the door is supported by an upper pivot hinge and a lower pivot hinge and the door is hung openably and closably with respect to the frame, and in particular, the door can be easily hung from the frame. It is related to the pivot hinge.

The pivot hinge inserts the tip of the pivot shaft provided at the upper or lower part of the door or frame on the hanging side into the bearing portion provided on the frame or door, and supports the door so as to be openable and closable around the pivot shaft. There are various known pivot hinges having a structure in which a door can be attached and detached (see, for example, Patent Document 1). The pivot hinge described in Patent Document 1 is provided with a pivot pin at the lower part of the frame body, the upper end of the pin is engaged with a bearing hole provided at the lower part of the door, and the shaft pin is moved up and down at the upper part of the door. It is provided as possible and urged upward by a spring, and the tip of the shaft pin is engaged with the shaft hole provided in the upper part of the frame. The shaft pin is inserted through the holder, and a connecting hole extending in the vertical direction is provided on the side surface of the holder to connect the upper locking hole and the lower locking hole extending in the horizontal direction with the upper and lower locking holes. An operating member is projected on the side surface of the shaft pin so as to selectively engage the upper locking hole and the lower locking hole via the connecting hole. Then, in a state where the operating member is engaged with the lower engaging hole and the tip of the shaft pin is pulled down, the tip of the lower pivot pin is engaged with the bearing hole of the door, and then the door is raised to erect the shaft. The pin is moved to a position facing the shaft hole provided in the frame body. Then, when the tip of the shaft pin faces the shaft hole, the operation member is operated to move the operation member from the lower locking hole to the communication hole, and the shaft pin moves upward by the urging spring. The tip of the shaft pin engages with the shaft hole provided in the frame. Further, the operating member is operated to rotate the shaft pin, the operating member is engaged with the upper locking hole and the locking recess provided on the inner wall thereof, the shaft pin is locked, and the door can be rotated. Suspended in. When removing the door from the frame body, the operating member is escaped from the upper engaging hole and moved to the lower locking hole through the communication hole to lower the shaft pin and pull out the tip portion from the upper shaft hole. The door is removed from the frame by pulling out the upper end of the lower pivot pin from the shaft hole of the frame while tilting the door.

When suspending the door as described above, the operating member is engaged with the lower locking hole to retract the shaft pin. If the shaft pin remains protruding from the door due to the action of the spring, the shaft pin will be framed. This is because there is a risk of collision with the body and deformation or scratches. Further, since the shaft pin and the like are provided above the hanging side of the door, in order to operate the operating member provided on the shaft pin, the fingertip must be moved to the upper part of the door hanging side while holding the door. Must be. In order to support the load of the door, the door is usually lifted by hand, so in order to move the shaft pin by the above manual operation, the tip of the shaft pin faces the shaft hole of the frame. , You need to take your hand off the door and reach for the shaft pin. If the door is light and small, you may be able to do it by yourself, but if the door is large and heavy, you have to take your hand off the door while keeping the door upright, so you have to work alone. Difficult and not easy to do.

Japanese Unexamined Patent Publication No. 2000-291316 (Claims, drawings)

As described above, the present invention is a pivot hinge in which a pivot shaft is inserted into a shaft hole to open and close the door, and a pivot hinge that allows even one person to easily work when suspending the door from the frame. Is to provide.

According to the present invention, the tip of the pivot shaft is inserted into the bearing portion, the door is rotatably supported by the upper pivot hinge and the lower pivot hinge on the frame body, and the tip of the pivot shaft of at least one hinge is projected from the case. In the pivot hinge provided as possible, the pivot shaft is urged by a spring in the direction in which the tip protrudes from the case and in the direction in which the tip rotates, and the pivot shaft is attached to the tip of the pivot shaft from the side of the bearing portion. An inclined surface is provided so that the tip of the pivot shaft abuts on the bearing portion and retracts the pivot shaft when it is close to the bearing portion, and in the case of holding the pivot shaft, it is projected on the side surface of the pivot shaft. A cam groove is formed so as to project the operating rod to the outside of the case, and the cam groove has a vertical groove extending along the longitudinal direction of the pivot shaft and openings at both ends of the vertical groove to rotate the pivot shaft. The pivot shaft is projected at a position where the inclined surface at the tip of the pivot shaft is adjacent to the bearing portion by opening in the immersive side lateral groove and the protruding side lateral groove extending in the direction of the immersive side and the vertical groove between the immersive side lateral groove and the protruding side lateral groove. A pivot hinge characterized in that a locking portion is provided to temporarily hold the operating rod so as to limit it and to release the operating rod when the pivot shaft retracts from the temporary holding position. Is provided and the above problem is solved.

According to the present invention, the locking portion has a locking edge that protrudes at a sharp angle with respect to the protruding direction of the pivot shaft, and is separated from the vertical groove in the protruding direction of the pivot shaft and approaches the vertical groove in the immersion direction. Provided is the pivot hinge, which is an inclined groove, the spring being a pre-wound torsion coil spring having one end fixed to the wall of the case and the other end fixed to the middle of the pivot shaft. To.

Further, according to the present invention, the locking portion is provided with the pivot hinge provided with a plurality of locking step portions having different depths for temporarily holding the operating rod.

The present invention is configured as described above, and when the door is suspended, the pivot shaft is pushed in the immersion direction when the inclined surface at the tip of the pivot shaft comes into contact with the side portion of the bearing portion at the stage of raising the door. Since the door is retracted, the door can be moved further, and there is no risk of damaging the pivot shaft or the like. Further, since the pivot shaft is urged by a spring in the direction in which the tip protrudes from the case and in the direction in which the tip rotates, the operating rod projecting from the side surface of the pivot shaft is provided on the case with an immersion side lateral groove and a protrusion side. When it corresponds to the lateral groove, it can be automatically rotated in the direction of entering the lateral groove and held at that position. On the other hand, when the operating rod is moved in the direction of engaging with the locking portion to lock against the spring, the protrusion and rotation of the pivot shaft are restricted, and the pivot shaft is temporarily held in that state. Can be done.

According to the above configuration, when the door is suspended from the frame, if the operating rod is moved to the deepest part of the locking portion, the rotation of the pivot shaft is prevented and the inclined surface at the tip protrudes slightly. The pivot shaft can be temporarily held in this state. When the door is erected in this state, as described above, the inclined surface hits the side surface of the bearing portion, the pivot shaft is gradually immersed, and the operating rod starts to move in the direction of disengaging from the locking portion. Then, when the pivot shaft retracts to a position where the tip slides on the same plane as the peripheral edge of the opening of the shaft hole, the operating rod is disengaged from the locking portion. Since the pivot shaft is urged in the protruding direction, the pivot shaft further protrudes at the moment when the tip faces the shaft hole, and the tip rushes into the shaft hole. At this time, since the pivot shaft is urged in the rotation direction and the protruding side lateral groove is opened at the end of the vertical groove, the operating rod automatically enters the protruding side lateral groove and protrudes from the pivot shaft. It can be locked in position and the door can be hung. In the above-mentioned hanging work, the operator only needs to first lock the operation rod to the locking portion, and then can work without taking his / her hand off the door. Therefore, the operator can open the door by himself / herself. It can be easily hung. If a plurality of locking steps having different depths (lengths in the direction in which the pivot shaft protrudes) are provided in the locking portions, if the gap (dust) between the frame and the door is large, For example, when there is a large amount of dust between the upper frame of the frame and the upper frame of the door, if the operating rod is temporarily held by the locking step with a large depth, the pivot shaft will protrude greatly from the upper frame of the door. It can be brought into contact with the part without any trouble. When the dust is normal, it may be temporarily held in the locking step portion having a shallow depth, and the protrusion amount of the pivot shaft can be accurately adjusted so that the dust can be reliably brought into contact with the bearing portion.

A perspective view of the case with the pivot shaft incorporated. An exploded perspective view. The relationship between the cam groove and the operating rod is shown. FIG. 3A shows a state in which the operating rod has entered the immersion side lateral groove, FIG. 3B shows a state in which the operating rod is located in the vertical groove, and FIG. 3C shows the operating rod engaged in the locking portion. Each description of the fitted state, FIG. 3D shows the operating rod escaped from the locking portion, FIG. 3E shows the operating rod moved to the end of the vertical groove, and FIG. 3F shows the operating rod entering the protruding side lateral groove. Figure. The perspective view which shows the Example which made the side surface of the case an arc surface. The process of suspending the door is shown. FIG. 5A shows a state in which the operation rod is inserted into the immersion side lateral groove, FIG. 5B shows a state in which the operation rod is temporarily held in the locking portion, and FIG. 5C shows a state in which the door is tilted to incorporate the lower pivot hinge. In this state, FIG. 5D shows the tip of the pivot shaft in contact with the side of the bearing, FIG. 5E shows the pivot shaft slightly immersed and the operating rod escapes from the locking portion, and FIG. 5F shows the tip of the pivot shaft. Each explanatory view of a state in which the operating rod is engaged with the shaft hole and the operating rod has entered the lateral groove on the protruding side. The relationship between the bearing portion and the pivot shaft is shown. FIG. 6A shows a state in which the operating rod is temporarily held by the locking portion and the tip of the pivot shaft approaches the bearing portion, and FIG. 6B shows the inclined surface of the tip of the pivot shaft of the bearing portion. In FIG. 6C, the tip of the pivot shaft is close to the peripheral edge of the opening of the shaft hole, and in FIG. 6D, the tip of the pivot shaft enters the shaft hole and the operation rod reaches the end of the vertical groove. Each explanatory view of the state which entered into the protrusion side lateral groove after moving. Explanatory drawing which shows another Example. Explanatory drawing which shows the other embodiment of the locking part. Explanatory drawing which shows still more embodiment of the locking part. Other examples of the bearing portion are shown, (A) is a cross-sectional view, and (B) and (C) are bottom views, respectively. Still another embodiment of the bearing portion is shown, (A) is a cross-sectional view, and (B) and (C) are bottom views, respectively. The relationship between the bearing portion and the other embodiment of the pivot shaft is shown. FIG. 12A shows a state in which the operating rod is temporarily held by the locking portion and the tip of the pivot shaft approaches the guide groove of the bearing portion, and FIG. 12B shows the pivot shaft. FIG. 12C shows a state in which the inclined surface of the tip begins to abut on the guide groove opening on the side of the bearing portion, FIG. 12C shows a state in which the tip of the pivot shaft is guided by the guide groove and approaches the peripheral edge of the opening of the shaft hole, FIG. 12D. Is an explanatory view of a state in which the tip of the pivot shaft enters the shaft hole, the operation rod moves to the end of the vertical groove, and then enters the lateral groove on the protruding side.

The pivot hinge is composed of an upper pivot hinge provided at the upper part on the hanging side of the door and a lower pivot hinge provided at the lower part, as described in FIG. 5 and Patent Document 1 for explaining the hanging process of the door. Has been done. In the embodiment shown in FIG. 5, the lower pivot hinge 5 is formed by fixing the pivot shaft 2 to the lower part of the frame 1 and rotatably engaging the tip end with the bearing portion 4 provided at the lower part of the door 3. A pivot shaft 6 is provided on the upper part of the door 3 so as to be able to appear and disappear, and the upper pivot hinge 8 is configured so that the pivot shaft 6 is rotatably engaged with a bearing portion 7 provided on the frame body 1. Instead of the above configuration, the pivot shaft of the lower pivot hinge is provided so as to be retractable from the door so as to engage with the bearing portion provided on the frame body side, or the pivot shaft of the upper pivot hinge is provided on the frame body side to the door side. A bearing portion may be provided or may be appropriately configured.

At least one pivot shaft of the pivot hinge is held in the case 9 so that it can appear and disappear. In the embodiment shown in the figure, a case 9 constituting the upper pivot hinge 8 is provided on the hanging side of the door, and a bearing portion 7 for rotatably holding the tip of the pivot shaft 6 on the upper frame of the frame body. Is provided. The case 9 has an upper piece 10, a side piece 11, and a bottom piece 12 formed in a series in a substantially U-shape by bending a substrate, and the side piece 11 is provided with a side plate 13 extending between the upper piece 10 and the bottom piece 12. Has been done. In FIG. 1, the side plate 13 is formed in a flat plate shape, but as shown in FIG. 4, it can be curved in an arc shape so as to surround the pivot shaft 6 at substantially regular intervals. The upper piece 10 and the side piece 11 are formed with mounting holes 14 for fixing the case 9 to the door 3, and the pivot shaft 6 is inserted into the upper piece 10 and the bottom piece 12 so as to be able to move forward and backward in the longitudinal direction. A through hole 15 is provided so as to do so. A recess 16 is formed around the upper through hole 15, and as shown in FIG. 7, an appropriate flange 17 is formed on the hole edge of the through hole 15 to guide the movement of the pivot shaft 6. It can also be configured to do so.

In the embodiment shown in FIG. 2, the pivot shaft 6 is formed so that the upper portion is formed in the large diameter portion 18 and the lower portion is formed in the smaller diameter portion 20 via the intermediate step portion 19. Although the inner diameter of the through hole 15 is also changed up and down, the outer diameter of the pivot shaft 6 and the inner diameter of the through hole 15 can be formed to be the same diameter on the upper and lower sides. An inclined surface 21 is formed at the tip of the pivot shaft 6 so that the pivot shaft 6 is pressed in the axial direction when a force is applied to the tip from the lateral direction, and a horizontal plane adjacent to the inclined surface is formed at the tip. 21a is formed. In the embodiment shown in FIG. 2, the surface forming the inclined surface 21 is formed on a flat surface, but it can also be formed on a spherical surface or an arc surface as shown in FIG. 7. In FIG. 1 of the pivot shaft 6, a stop ring 22 is fitted to the lower end to prevent it from coming off, and an operation rod 24 is provided on the side surface so as to project outward from the cam groove 23 formed in the side plate 13. The screw portion 25 provided at the base of the shaft is screwed into the screw hole 26 provided at the pivot shaft 6 to project the operating rod 24. Since the movement of the pivot shaft 6 is regulated by the operating rod 24, the stop wheel 22 can be omitted.

The pivot shaft 6 is urged by a spring 27 in a direction in which the tip protrudes and a direction in which the pivot shaft 6 rotates about the axis. In the embodiment shown in FIG. 1, a torsion coil spring is inserted into the lower part of the pivot shaft 6 using the small diameter portion 20 as a guide, and one end 28 thereof is inserted into a mounting hole 29 provided in the bottom piece 12 and prewound. In this state, the other end 30 is fixed to the mounting portion 31 provided in the intermediate portion of the pivot shaft 6.

A tension coil spring can also be used instead of the above-mentioned torsion coil spring. In this case, for example, if one end of the tension coil spring is fixed to the base of the operating rod and the other end is rotated around the pivot shaft and fixed to the upper piece of the case, the pivot shaft can be rotated in the protruding direction. It can be urged in the direction of movement (not shown).

The cam groove 23 is formed to have a width that allows the operation rod 24 to be moved, and has a vertical groove 32 extending along the longitudinal direction of the pivot shaft 6, and an immersion side horizontal groove 33 and an upper end that open at the lower end of the vertical groove. Each of the projecting side lateral grooves 34 is provided, and the directions in which these lateral grooves 33 and 34 extend are the directions in which the pivot shaft 6 is rotated by the urging spring 27.

The vertical groove 32 between the immersion side horizontal groove 33 and the protruding side horizontal groove 34 has a wall surface facing the wall surface of the vertical groove on the side where the horizontal groove is provided, that is, a wall surface opposite to the rotation direction due to the bias of the pivot shaft. A locking portion 35 is provided which opens in the air and holds the operating rod 24 so as to be detachable. As shown in FIGS. 1 to 3, in the embodiment, the locking portion 35 has a locking edge 36 that intersects the protruding direction of the pivot shaft 6 at an acute angle, and the vertical length in the protruding direction of the pivot shaft 6. It is formed in a groove shape that is separated from the groove 32 and is inclined in the direction of approaching the vertical groove in the immersion direction, but it can also be formed in an appropriate notch. The position of the locking portion 35 is such that the inclined surface 21 at the tip of the pivot shaft 6 projects from the upper part of the door 3 and can come into contact with the side surface of the bearing portion 7, and the pivot shaft 6 is allowed to retract but protrudes. Temporarily holds the operating rod 24 so as to limit it so that when the pivot shaft 6 retracts from that position and sinks to a predetermined position, the operating rod 24 can be separated from the locking portion 35 to release the movement of the pivot shaft 6. It is installed in a suitable position.

The bearing portion 7 that can be installed in the upper frame of the frame body 1 is a plate-shaped body having a shaft hole 37 that rotatably holds the pivot shaft 6, and the peripheral edge of the opening of the shaft hole 37 is the pivot. The horizontal plane 21a at the tip of the shaft 6 is formed on the flat surface 38 so as to be in sliding contact with each other. In FIG. 6, a single plate-like body is shown for convenience of explanation, but a smooth plate may be provided on the lower surface side of the frame body (not shown). When the door 3 is suspended from the outer edge of the bearing portion 7, particularly to the frame body 1, a guide surface such as an arc surface or an inclined surface is preferably formed at a corner portion on the side where the pivot shaft 6 approaches. The inclined surface 21 at the tip of the shaft 6 is guided.

When the door 3 is suspended, if the pivot shaft 6 projects upward before the tip of the pivot shaft 6 slides into the flat surface 38 where the opening of the shaft hole 37 exists, the pivot shaft is projected onto the side surface of the bearing portion 7. 6 will hit and cause inconvenience. Therefore, the length of the locking portion 35 is such that the tip of the pivot shaft 6 shifts to the flat surface 38 where the opening of the shaft hole 37 exists after the inclined surface 21 at the tip of the pivot shaft 6 hits the side surface of the bearing portion 7. Up to this point, the operating rod 24 is formed to have a length so as not to be disengaged from the locking portion 35 even if the pivot shaft 6 is retracted.

The process of suspending the door 3 from the frame 1 will be described with reference to FIGS. 3, 5, and 6. In the state where the door 3 is removed from the frame body 1, the operating rod 24 is engaged with the immersion side lateral groove 33 as shown in FIG. 3A, and the pivot shaft 6 has a tip end as shown in FIG. 5A. It does not protrude from the upper end of the door 3. Then, as shown in FIGS. 3B and 3C, the operating rod 24 is moved from the immersion side horizontal groove 33 to the locking portion 35 via the vertical groove 32 against the urging action of the spring 27 in the rotation direction. As shown in FIG. 5B, the inclined surface 21 at the tip of the pivot shaft 6 slightly protrudes from the upper part of the door 3. In this state, when the door 3 is tilted, the lower part of the door 3 is engaged with the lower pivot hinge 5 and then the door is erected as shown in FIG. 5C, the inclined surface 21 at the tip becomes a bearing portion. At the side surface of No. 7 (FIG. 5D), the pivot shaft 6 is gradually pushed down so that the horizontal plane 21a adjacent to the upper end of the inclined surface 21 is in sliding contact with the plane 38 forming the opening of the shaft hole 37. At this time, as shown in FIGS. 3D and 5E, when the operating rod 24 is disengaged from the locking portion 35 and the tip corresponds to the shaft hole 37, the operating rod 24 is the upper portion of the vertical groove 32 as shown in FIG. 3E. The tip of the pivot shaft 6 is inserted into the shaft hole 37 of the bearing portion 7. Then, the pivot shaft 6 rotates by the action of the spring 27, the operating rod 24 enters the protruding side lateral groove 34, and the pivot shaft 6 is locked (FIGS. 5F and 6D).

When removing the door from the frame body, if the operation rod 24 is moved from the projecting side lateral groove 34 to the immersion side lateral groove 33 via the vertical groove 32, the pivot shaft 6 can be lowered and escaped from the bearing portion 7. After that, the door can be removed from the lower pivot hinge in the reverse order of the above.

In the above embodiment, the locking portion 35 is a groove in which the locking edge 36 opening in the vertical groove 32 is formed at an acute angle, but this locking portion can be formed in various ways. For example, as shown in FIG. 8, as the locking portion 35, the back side (the side away from the rotation direction due to the bias of the pivot shaft) locking groove 39 extending along the protruding direction of the pivot shaft 6 and the back side engaging When a horizontal guide surface 40 is formed between the stop groove 39 and the locking edge 36 and the operating rod 24 is temporarily held in the back locking groove 39 when the door 3 is suspended, the tip of the pivot shaft 6 is moved. When sliding on the flat surface 38 of the bearing portion 7, the operating rod 24 escapes from the back locking groove 39 to reach the horizontal guide surface 40, and slides the horizontal guide surface 40 vertically due to the urging force in the rotational direction. It can enter the groove 32 and smoothly project the pivot shaft 6.

Further, the protrusion amount of the pivot shaft 6 can be adjustedly provided. For example, when the gap (dust) between the frame body 1 and the door 3 is large, in the embodiment, when the dust between the upper frame of the frame body 1 and the upper frame of the door 3 is large, the normal protrusion amount is sufficient. There is a possibility that the tip of the pivot shaft 6 cannot be reliably brought into contact with the side portion of the bearing portion 7. In this case, as shown in FIG. 9, the locking portion 35 may be composed of a plurality of locking step portions having different depths (lengths) in the protruding direction of the pivot shaft 6. In FIG. 9, two locking steps are provided, and the locking step 41 located on the back side (the side away from the rotation direction due to the bias of the pivot shaft) is formed deeply in the protruding direction of the pivot shaft 6. The depth of the locking step 42 near the vertical groove 32 side is formed to be shallower than that, and the length at which the tip of the pivot shaft 6 protrudes from the upper frame of the door 3 according to the place where the operating rod 24 is temporarily held. Is designed to change. In a normal case, if the operating rod 24 is temporarily held by the shallow locking step portion 42 on the vertical groove side, the tip of the pivot shaft 6 can be slightly projected as in the above embodiment. In the case of a door with a large amount of dust, if the operating rod 24 is temporarily held by the locking step 41 located on the back side, the amount of protrusion of the pivot shaft 6 becomes large, so that the bearing portion 7 is surely held. It can be brought into contact with the side surface.

In the above embodiment, the flat surface 38 of the bearing portion 7 is formed to be flat as a whole, but a guide groove may be provided at a portion where the tip of the pivot shaft 6 is in sliding contact to align the bearing portion 7. In the embodiment shown in FIG. 10, a guide groove 43 having a width substantially equal to the diameter of the shaft hole 37 is provided on the side of the shaft hole 37, and as shown in FIG. It is opened in the direction, or as shown in FIG. 10C, an inclined surface 44 is provided at the opening end to facilitate the alignment of the pivot shaft. At this time, as shown in FIG. 11, if both ends of the guide groove 43 are opened on both sides of the bearing portion 7, it is possible to deal with the doors that are different from each other.

Explaining the suspension process when the bearing portion 7 provided with the guide groove 43 is used, FIG. 12A shows that the operating rod 24 is temporarily held by the locking portion 35 and the pivot shaft 6 is slightly projected to erect the door. , The tip of the pivot shaft 6 is in close proximity to the bearing portion 7. When the door is further raised from this state, the tip of the pivot shaft 6 is guided by the guide groove 43 of the bearing portion 7 and begins to enter the groove. When the tip comes into contact with the base portion (plane surface) 45 of the guide groove 43, the pivot shaft 6 retracts, and the operating rod 24 escapes from the locking portion 35 due to the rotational urging force of the pivot shaft 6 (FIG. 12B). Even if the operating rod 24 reaches the vertical groove 32, the pivot shaft 6 does not protrude at the stage where the tip is in sliding contact with the base portion 45 of the guide groove 43 (FIG. 12C), but the tip faces the shaft hole 37. Then, the pivot shaft 6 protrudes by the spring 27, is inserted into the shaft hole 37, and the operating rod 24 enters the lateral groove 34 by the rotational urging force to be locked (FIG. 12D).

In each of the above embodiments, the pivot shaft 6 is engaged with the lateral grooves 33 and 34 at the immersed position and the protruding position to be locked, but in the case of a simple door, these lateral grooves are omitted. The vertical groove 32 and the locking portion 35 may control the operating rod 24.

1 Frame 3 Door 6 Pivot shaft 7 Bearing part 9 Case 15 Through hole 21 Inclined surface 23 Cam groove 24 Operating stick 27 Spring 32 Vertical groove 33 Immersion side lateral groove 34 Protruding side lateral groove 35 Locking part 37 Shaft hole 38 Plane

Claims (7)

A pivot hinge in which the tip of the pivot shaft is inserted into the bearing portion and the door is rotatably supported by the upper pivot hinge and the lower pivot hinge, and the tip of the pivot shaft of at least one hinge is provided so as to be retractable from the case. In the case where the pivot shaft is urged by a spring in the direction in which the tip protrudes from the case and in the direction in which the tip rotates, and the pivot shaft approaches the bearing portion from the side of the bearing portion at the tip of the pivot shaft. An inclined surface is provided so that the tip of the pivot shaft abuts on the bearing portion and the pivot shaft is retracted. In the case of holding the pivot shaft, an operating rod projecting from the side surface of the pivot shaft is used in the case. A cam groove is formed so as to project outward, and the cam groove is a vertical groove extending along the longitudinal direction of the pivot shaft and an immersion side that opens at both ends of the vertical groove and extends in the direction in which the pivot shaft rotates. The operating rod is opened in the lateral groove and the projecting side lateral groove and the vertical groove between the immersion side lateral groove and the projecting side lateral groove so that the inclined surface at the tip of the pivot shaft limits the protrusion of the pivot shaft at a position adjacent to the bearing portion. A pivot hinge characterized in that it has a locking portion that temporarily holds and holds the operating rod detachably so as to release the operating rod when the pivot shaft retracts from the temporary holding position. A pivot hinge in which the tip of the pivot shaft is inserted into the bearing portion and the door is rotatably supported by the upper pivot hinge and the lower pivot hinge, and the tip of the pivot shaft of at least one hinge is provided so as to be retractable from the case. In the case where the pivot shaft is urged by a spring in the direction in which the tip protrudes from the case and in the direction in which the tip rotates, and the pivot shaft approaches the bearing portion from the side of the bearing portion at the tip of the pivot shaft. An inclined surface is provided so that the tip of the pivot shaft abuts on the bearing portion and the pivot shaft is retracted. In the case of holding the pivot shaft, an operating rod projecting from the side surface of the pivot shaft is used in the case. A cam groove is formed so as to project outward, and the cam groove opens in a vertical groove extending along the longitudinal direction of the pivot shaft and a vertical groove on the side opposite to the rotation direction due to the bias of the pivot shaft. An operating rod that temporarily holds the operating rod so that the inclined surface at the tip of the pivot shaft limits the protrusion of the pivot shaft at a position adjacent to the bearing portion, and releases the operating rod when the pivot shaft retracts from the temporary holding position. A pivot hinge characterized by having a locking portion that removably holds the. The pivot hinge according to claim 1 or 2, wherein the tip of the pivot shaft has a horizontal plane adjacent to the inclined surface, and the bearing portion has a flat surface in which the horizontal plane is in sliding contact. The locking portion has a locking edge that protrudes at a sharp angle with respect to the protruding direction of the pivot shaft, and is a groove that is inclined away from the vertical groove in the protruding direction of the pivot shaft and closer to the vertical groove in the immersion direction. The pivot hinge according to claim 1 or 2. The pivot hinge according to claim 1 or 2, wherein the spring is a pre-wound torsion coil spring having one end fixed to a wall portion of a case and the other end fixed to an intermediate portion of a pivot shaft. The pivot hinge according to claim 1 or 2, wherein the locking portion has a plurality of locking step portions having different depths. The door provided with the pivot hinge according to any one of claims 1 to 6.

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