JP5307762B2 - Pivot hinge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pivot hinge which prevents a door from being detached from a door frame by maintaining a pivoting shaft of a door in a protruding state with a lock mechanism regulating rotation of an operating shaft and thereby improving safety. <P>SOLUTION: The pivot hinge comprises: a housing; a door pivoting shaft made movable in a vertical direction in the housing; an operating shaft which operates a movement of the door pivoting shaft between a protruding state where the door pivoting shaft is protruded from an upper end of the housing and a housing state where the door pivoting shaft is housed in the housing; a link mechanism to move the door pivoting shaft by the rotation of the operation shaft; and a lock mechanism to regulate the rotation of the operating shaft when the door pivoting shaft is in the protruding state. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a pivot hinge for attaching a door to a door frame so as to be openable and closable, and more particularly to a pivot hinge having a lock mechanism for restricting rotation of an operation shaft.

  Conventionally, as a pivot hinge that pivotably connects the upper end of the door and the upper edge of the door frame, it is confirmed whether or not the door pivot shaft to be fitted to the bearing of the door frame has completely protruded. A pivot hinge that can be used is known (for example, see Patent Document 1).

Japanese Patent No. 4278694

  The pivot hinge can grasp the movement state of the door pivot shaft by visually confirming the movement state of the connecting pin with respect to the groove portion formed in the housing, and can reliably perform the door hanging work. It can be done.

  In this structure, the door pivot shaft is moved by using two springs. Even when one of the springs is broken, the other acts as an auxiliary to prevent the door pivot shaft from lowering. However, when both springs are damaged, there is a risk that the door will fall off due to the weight of the door pivot shaft.

  Therefore, the present invention solves such problems, and maintains the protruding state of the door pivot shaft by a lock mechanism that restricts the rotation of the operation shaft, so that the door can be removed from the door frame. An object is to provide a pivot hinge that prevents and secures safety.

In order to solve the above problems, a pivot hinge according to a first aspect of the present invention includes a housing, a door pivot shaft installed in the housing so as to be vertically movable, and the door pivot. An operation shaft for operating the movable shaft between a protruding state in which the shaft is protruded from the upper end of the housing and a storage state in which the door pivot shaft is housed in the housing; and the rotation of the operation shaft. A link mechanism for moving the door pivot shaft; and a lock mechanism for restricting the rotation of the operation shaft in a protruding state of the door pivot shaft, the lock mechanism being attached toward the operation shaft. A movable part is provided, and the rotation of the operation shaft is restricted by the engagement of the movable part and the operation shaft.

The pivot hinge according to claim 2 of the present invention is the pivot hinge according to claim 1 , wherein the groove portion formed in the operating shaft and the locking portion formed in the movable portion are engaged. To do.

Further, the pivot hinge according to claim 3 of the present invention is the pivot hinge according to claim 2 , wherein the groove portion of the operation shaft is arranged in the vertical direction in the projecting state of the door pivot shaft, and is movable. The part is movable in the vertical direction by an urging force.

Also, the pivot hinge of the invention according to claim 4 of the present invention is the pivot hinge according to any one of claims 1 to 3, the elastic member that urges the movable part in the operation shaft Is fixed to the housing, and in the housed state of the door pivot shaft, the elastic member comes into contact with the link mechanism, and the urging force toward the operation shaft is restricted.

According to a fifth aspect of the present invention, there is provided a pivot hinge according to any one of the second to fourth aspects, wherein the pivot hinge is exposed at the end of the operating shaft exposed from the side surface of the housing. A groove portion is formed, and the movable portion is accommodated in a cutout of a housing formed around the end portion.

According to a sixth aspect of the present invention, there is provided a pivot hinge according to the present invention, comprising a housing, a door pivot shaft installed in the housing so as to be vertically movable, and the door pivot shaft. A spring urging in a direction protruding in the vertical direction from the upper end of the body, an operating shaft installed in the horizontal direction of the housing, and a first link pivoted to the operating shaft and rotated by the operating shaft And a second link that pivotally connects an end of the first link and a lower end of the door pivot shaft, and a lock provided with a movable portion that is installed in the housing and biases toward the operation shaft. A door pivot shaft, the distance between the pivot portion of the door pivot shaft and the second link and the operation shaft in a state where the door pivot shaft protrudes from the upper end of the housing. And the distance between the pivot part of the second link and the pivot part of the second link and the first link, and the second link and the first link. The door pivot shaft is housed in the housing via the first link and the second link by the operation of the operation shaft. Configured so that the pivoting portion of the first link and the second link at the time of protrusion and storage of the door pivot shaft stops at a position beyond the vertical axis of the door pivot shaft, In the state where the door pivot shaft protrudes, the movable portion and the operation shaft are engaged to restrict the rotation of the operation shaft.

  Since the pivot hinge of the present invention includes a lock mechanism that restricts the rotation of the operation shaft, it is possible to prevent inadvertent rotation of the operation shaft. Thereby, since the protruding state of the door pivot shaft is maintained, the door can be prevented from being detached from the door frame, and safety can be ensured.

  Since the movable portion has an urging force toward the operation shaft, the movable portion and the operation shaft can be engaged only by rotating the operation shaft and projecting the door pivot shaft. Thereby, rotation control of the operation shaft can be automatically performed.

  In the state where the door pivot shaft is housed, the elastic member abuts on the link mechanism and the urging force to the operation shaft is restricted, so that the movable portion and the operation shaft are not engaged. Thereby, since the protruding state or the storage state of the door pivot shaft can be clearly distinguished, a mistake in hanging the door can be eliminated, and safety is improved.

  Since the groove is formed at the end of the operation shaft exposed from the side surface of the housing, the operation shaft can be easily operated together with the unlocking operation. Thereby, the complicated operation | work which performs operation of unlocking operation and operation of the axis | shaft for operation by another axis part becomes unnecessary.

  Since the movable portion is housed in the cutout of the housing, the locked state of the groove portion and the locking portion can be visually recognized from the outside of the housing. Thereby, the work mistake in an operator can be eliminated.

It is a front view in the state where the shaft for door pivot support of the pivot hinge in Example 1 of the present invention protrudes. It is a partial cross section left view of the state in which the axis | shaft for door pivot support of the pivot hinge in Example 1 of this invention protruded. It is PP sectional drawing of the pivot hinge of FIG. 2 in Example 1 of this invention. It is a partially omitted enlarged left side view of a state in which the door pivot support shaft of the pivot hinge in Embodiment 1 of the present invention protrudes. It is a partial omission left side sectional view of the lock release state in the middle of storing the axis for pivoting the door of the pivot hinge in Example 1 of the present invention. It is a partially omitted enlarged left side sectional view showing a state in which the door pivot shaft of the pivot hinge in Embodiment 1 of the present invention is housed. It is front sectional drawing of the state which accommodated the axis | shaft for door pivots of the pivot hinge in Example 1 of this invention. It is a front view of the state which accommodated the axis | shaft for door pivot support of the pivot hinge in Example 1 of this invention. (A) The partially expanded explanatory view showing the locked state of the door pivot shaft of the pivot hinge in Example 2 of this invention, (b) The partially expanded explanatory view showing the intermediate state of unlocking. It is the partially expanded explanatory view showing the (a) locked state of the door pivot shaft of the pivot hinge in Example 3 of this invention, (b) The partially expanded explanatory view showing the middle state of unlocking. (A) Partial expansion explanatory drawing showing the locked state of the door pivot shaft of the pivot hinge in Example 4 of this invention, (b) Partial expansion explanatory drawing showing the middle state of unlocking. (A) Partial expansion explanatory drawing showing the locked state of the door pivot shaft of the pivot hinge in Example 5 of this invention, (b) It is the QQ expanded sectional view. (A) The partially expanded explanatory view showing the middle state of unlocking of the door pivot shaft of the pivot hinge in Example 5 of this invention, (b) The partially expanded explanatory view showing the middle state of unlocking. (A) Partial expansion explanatory drawing showing the locked state of the door pivot shaft of the pivot hinge in Example 6 of this invention, (b) It is the RR expanded sectional view. (A) Partial expansion explanatory drawing showing the middle state of unlocking of the door pivot shaft of the pivot hinge in Example 6 of this invention, (b) It is the SS expanded sectional view. (A) Partial expansion explanatory drawing showing the locked state of the door pivot support shaft of the pivot hinge in Example 7 of this invention, (b) Partial expansion explanatory drawing showing the intermediate state of lock release.

  Hereinafter, a pivot hinge according to an embodiment of the present invention will be described with reference to the drawings. The pivot hinge 1 is installed at the upper end of the door D, and connects the door D and the door frame D1 via a door pivot shaft 4 protruding upward from the door D. The door pivot shaft 4 is inserted through an insertion hole D3 of a bearing D2 provided in the door frame D1.

  In the present embodiment, as shown in FIG. 1, a case where the pivot hinge 1 is installed at the right end portion of the door D and is hung on the door frame D1 will be described. Moreover, let the side surface of the door D which can visually recognize the groove part 12a of the shaft 12 for operation in FIG. 1 be the front side, and let the other be the back side. When the groove 12a of the operation shaft 12 is located on the back side, the rotation direction of the operation shaft 12 described later is the reverse direction.

  As shown in FIGS. 1 to 8, the pivot hinge 1 according to the present invention includes a housing 2, a door pivot shaft 4, a first link 11, a second link 9, an operation shaft 12, and a lock mechanism. ing.

  The housing 2 has a cylindrical shape that forms the outside of the pivot hinge 1. As shown in FIGS. 2, 3, and 7, a connecting portion 2 a having a through hole through which the door pivot shaft 4 is inserted is integrally fixed to the upper end portion of the housing 2 by welding or the like. A cutout is appropriately provided on the side surface of the housing 2 so that a first link 11 and a second link 9 described later do not contact the inner wall. A horizontal plate 3 is connected to the upper end of the connecting portion 2a. The plate 3 is fixed to the upper end surface of the door D with a screw 3a or the like.

  The door pivot shaft 4 is provided inside the housing 2 in the vertical direction, and connects the door D and the door frame D1 in a state of protruding from the plate 3. A step portion 4a is formed on the peripheral surface of the door pivot shaft 4 located in the housing 2, and a spring receiving portion 5 is fixed to the step portion 4a. The spring receiving portion 5 supports the upper end portion of the spring 7 housed in the housing 2. The lower end portion of the spring 7 is supported by the spring receiving portion 6. The spring 7 is housed between the spring receiving upper part 5 and the spring receiving lower part 6 so as to have an urging force vertically upward. The spring receiving portion 6 is supported by the upper end portion of the inner housing 13 that is inserted inside the lower end portion of the housing 2 and fixed integrally therewith. Since the door pivot shaft 4 is maintained in a protruding state by a lock mechanism described later, the spring 7 does not necessarily have to be installed.

  The second link 9 is a member that connects the door pivot shaft 4 and the first link 11. The lower end portion of the door pivot shaft 4 is attached to the upper end portion of the second link 9 via a pin 8 that is pivotally supported in the horizontal direction. The second link 9 is inserted through a through hole 6 a formed in the vertical direction of the spring receiving portion 6, and attached so that the lower end portion of the second link 9 is positioned below the spring receiving portion 6.

  The first link 11 is a member that is connected to the operation shaft 12 and transmits the rotation of the operation shaft 12 to the second link 9. The first link 11 is located below the spring receiving portion 6 and is attached to the inner side of the internal housing 13. One end of the first link 11 is rotatably attached by an operation shaft 12 that pivotally supports the housing 2 in the horizontal direction. The other end of the first link 11 is rotatably attached to the lower end of the second link 9 via the pin 10.

  The operation shaft 12 is a member that operates the protruding state and the storage state of the door pivot shaft 4. The operation shaft 12 is rotatably supported by the housing 2 and the internal housing 13. Both end portions of the operation shaft 12 are flush with the side surface of the housing 2. At the end of the operation shaft 12, a groove 12 a that can be engaged with the tip of the driver is formed over the circumferential surface of the operation shaft 12. For example, the groove 12 is formed in a straight line from the circumferential surface in the radial direction.

  As shown in FIG. 7, an arc portion is provided at the lower end of the second link 9 so as to come into contact with the peripheral surface of the operation shaft 12 when the second link 9 is moved by the downward rotation of the first link 11. 9a is provided.

  On the side surface of the housing 2 where the groove 12a of the operation shaft 12 is exposed, as shown in FIGS. 1 and 8, the housing 2 is formed so that the substantially U-shaped cutout portion 2b surrounds the operation shaft 12. It is provided until it extends over the lower end part of. A lock mechanism is provided inside the notch 2b.

  The lock mechanism restricts the operation shaft 12 from rotating in a state where the door pivot shaft 4 protrudes, preferably in a state where the door pivot shaft 4 protrudes to the maximum. The lock mechanism includes an elastic member 16 and a movable portion 18.

  The movable portion 18 is a member that engages with the operation shaft 12 in a state in which the door pivot shaft 4 projects, preferably in a state in which the door pivot shaft 4 projects to the maximum. The movable portion 18 has substantially the same width as the cutout portion 2b and is slidably provided in the cutout portion 2b. The movable portion 18 includes a convex locking portion 18a at one end, and is arranged so that the locking portion 18a is positioned vertically upward. That is, the locking portion 18 a is arranged toward the operation shaft 12.

  The elastic member 16 is a member that always urges the movable portion 18 vertically upward. The other end portion of the movable portion 18 that does not have the locking portion 18 a is attached to one end portion of the elastic member 16 via the pin 17. The other end portion of the elastic member 16 is attached to the internal housing 13 on the side surface facing the notch portion 2 b via the pin 15. The elastic member 16 is made of, for example, a leaf spring, but can be made of synthetic rubber or synthetic resin having elasticity. The elastic member 16 and the movable part 18 may be integrally formed.

  When the movable portion 18 is biased vertically upward, the locking portion 18 a engages with the groove portion 12 a of the operation shaft 12. Specifically, as shown in FIG. 1, in the state where the door pivot shaft 4 protrudes, the linear groove portion 12a of the operation shaft 12 is arranged in the vertical direction. The movable part 18 is movable in the vertical direction along the notch 2b by the urging force of the elastic member 16. Thereby, the latching | locking part 18a engages with the groove part 12a, and it will be in a locked state.

  The movable portion 18 is provided with a long hole 18b along the longitudinal direction, and the movable portion 18 is slidably attached to the internal housing 13 by a pin 14 inserted through the long hole 18b. The movable portion 18 is easily slid along the notch 2b by the pin 14 and the long hole 18b.

  As shown in FIGS. 3 and 7, in the state where the door pivot shaft 4 protrudes or is housed, the pin 10 which is the pivotal portion of the first link 11 and the second link 9 is used for the door pivot. Located over the vertical axis of the shaft 4. Thereby, the door pivot shaft 4 does not move carelessly.

  In a state where the door pivot shaft 4 protrudes or is housed, the pin 10 which is the pivot portion of the first link 11 and the second link 9 is positioned beyond the vertical axis of the door pivot shaft 4. In order to achieve this, the distance between the pin 8 and the operation shaft 12 which is a joint between the door pivot shaft 4 and the second link 9 when the door pivot shaft 4 protrudes from the plate 3 to the maximum. The distance between the pin 8 at the pivotal portion of the door pivot shaft 4 and the second link 9 and the pin 10 as the pivotal portion of the first link 11 and the second link 9, and the first link 11 What is necessary is just to set smaller than the sum of the distance of the pin 10 of the pivot part with the 2nd link 9, and the shaft 12 for operation.

  The operation of the door pivot shaft 4 in the pivot hinge 1 constructed as described above will be described with reference to FIGS.

  In order to make the door pivot shaft 4 retracted, it is necessary to release the locked state of the operation shaft 12 and the movable portion 18 shown in FIGS. As shown in FIG. 5, the lock mechanism is released by moving the movable portion 18 vertically downward against the urging force of the elastic member 16 and releasing the engagement between the groove portion 12a and the locking portion 18a. Is called. This operation is efficiently performed by utilizing the tip of a driver inserted into the groove 12a.

  In the pivot hinge 1 in the present embodiment, the door pivot shaft 4 is accommodated in the housing 2 by rotating the operation shaft 12 counterclockwise from the front side of the door D. Specifically, the first link 11 rotates in conjunction with the operation shaft 12 being rotated. Thereby, the 2nd link 9 connected with the 1st link 11 moves below, rotating. As a result, the door pivot shaft 4 connected to the second link 9 moves downward against the biasing force of the spring 7.

  In a state where the pin 10 which is the pivotal portion of the first link 11 and the second link 9 is positioned beyond the vertical axis of the door pivot shaft 4, the door pivot shaft 4 is also moved by the urging force of the spring 7. The door pivot shaft 4 is housed without moving vertically upward.

  As shown in FIGS. 6 and 8, in a state where the door pivot shaft 4 is housed, the urging force of the elastic member 16 is restricted and the unlocked state of the movable portion 18 is maintained. More specifically, the first link 11 and the second link 9 are rotated by the operation of the operation shaft 12 to come into contact with the elastic member 16. As a result, the elastic member 16 is pressed vertically downward against the urging force. As a result, the biasing force is restricted, and the elastic member 16 cannot move the movable portion 18 vertically upward.

  The shape of the elastic member 16 is such that in the state in which the door pivot shaft 4 is accommodated, the urging force in the vertically upward direction is regulated by contacting the rotating first link 11 or the second link 9. The shape may be any shape, and in the state where the door pivot shaft 4 protrudes, the shape may be any shape as long as the movable portion 18 is always urged vertically upward.

  In order to make the door pivot shaft 4 project, the operation shaft 12 may be rotated clockwise from the front side of the door D in the pivot hinge 1 of this embodiment. In this state, since the first link 11 and the second link 9 operate in the reverse manner as described above, the elastic member 16 is released from contact with the first link 11 or the second link 9.

  Thereby, since the urging | biasing force is not controlled by the elastic member 16, the movable part 18 can be moved vertically upwards. In the state where the door pivot shaft 4 protrudes, the groove portion 12a is arranged in the vertical direction, so that the locking portion 18a can be engaged. As a result, the operation shaft 12 is locked from rotating.

  When the door pivot shaft 4 is projected, the operation pivot shaft 12 can be immediately rotated to release the door pivot shaft 4 without releasing the locked state. As a result, work efficiency can be improved.

  As described above, according to the pivot hinge 1 according to the present invention described above, in the state where the door pivot shaft 4 protrudes or is housed, the pin 10 which is the pivot portion of the first link 11 and the second link 9 is provided. Since the door pivot shaft 4 is positioned beyond the vertical axis of the door pivot shaft 4, the door pivot shaft 4 does not move carelessly.

  Furthermore, since the lock mechanism for restricting the rotation of the operation shaft 12 is provided, it is possible to prevent the operation shaft 12 from being unintentionally rotated. Thereby, since the protruding state of the door pivot shaft 4 is maintained, the door D can be prevented from being detached from the door frame D1, and safety can be ensured.

  Further, since the engagement between the groove portion 12a and the locking portion 18a can be efficiently released by utilizing the tip of a screwdriver inserted into the groove portion 12a of the operation shaft 12, the operation is performed together with the unlocking operation. The shaft can be easily operated. Thereby, the complicated operation | work which performs operation of unlocking operation and operation of the axis | shaft for operation by another axis part becomes unnecessary.

  Since the movable portion 18 is housed in the notch 2b of the housing 2, the locked state of the groove portion 12a and the locking portion 18a can be visually recognized from the outside of the housing 2. Thereby, the work mistake in an operator can be eliminated.

  In the above-described embodiment, the elastic member 16 does not necessarily need to contact the first link 11 or the second link 9 that rotates in a state where the door pivot shaft 4 is housed. At this time, as in Examples 2 to 7 below, by changing the shape of the groove 12a and the like in the operating shaft 12, it is possible to avoid the engagement of the locking portion 18a with the groove 12a. Can do.

  In the second embodiment, as shown in FIG. 9A, a narrow portion 12b that is narrower than the locking portion 18a is provided so as to be connected to the groove portion 12a of the operation shaft 12. As shown in FIG. 9B, the locking portion 18a is not engaged with the groove portion 12a in the middle of unlocking the operation shaft 12. On the other hand, the locking portion 18a engages with the groove portion 12a only when the groove portion 12a is positioned vertically downward, that is, only when the door pivot shaft 4 protrudes.

  In the third embodiment, as shown in FIG. 10A, an operation hole 12 c for rotating the operation shaft 12 is provided on the end surface of the operation shaft 12 separately from the groove portion 12 a. The operation hole 12c is formed in a cross shape, for example.

  As shown in FIG. 10B, the locking portion 18 a is not engaged with the groove portion 12 a in the middle of unlocking the operation shaft 12. On the other hand, the locking portion 18a engages with the groove portion 12a only when the groove portion 12a is positioned vertically downward, that is, when the door pivot shaft 4 protrudes.

  In the fourth embodiment, as shown in FIG. 11A, the groove portion 12 a in the third embodiment is provided on the peripheral surface of the operation shaft 12. The said groove part 12a is the meaning containing the hollow etc. except a through-hole. In this case, the locked state cannot be visually recognized from the outside of the housing 2. However, it is possible to confirm whether or not the operation shaft 12 is locked by slightly rotating the operation shaft 12.

  As shown in FIG. 11 (b), the locking portion 18a is not engaged with the groove portion 12a in the middle of unlocking the operation shaft 12. On the other hand, the locking portion 18a engages with the groove portion 12a only when the groove portion 12a is positioned vertically downward, that is, when the door pivot shaft 4 protrudes.

  In the fifth embodiment, as shown in FIGS. 12A and 12B, a protruding convex portion 12d is provided at one end of the operation shaft 12, and a flat portion 12e is provided at the other end via a step. The convex portion 12d is formed in a substantially elliptical shape, for example. The groove portion 12a is formed from the side wall of the convex portion 12d toward the flat portion 12e. The groove part 12a does not need to be provided until it extends over the side wall on the flat part 12e side.

  As shown in FIG. 13 (a), the locking portion 18a is movable along the side wall of the convex portion 12d when the operation shaft 12 is being unlocked. In the intermediate state of unlocking shown in FIG. 13B, the movable portion 18 is restricted from moving by the elongated hole 18b and cannot move vertically upward, and the locking portion 18a does not engage with the groove portion 12a. On the other hand, the locking portion 18a engages with the groove portion 12a only when the convex portion 12d is positioned vertically downward, that is, only when the door pivot shaft 4 protrudes.

  In Example 6, as shown in FIGS. 14A and 14B, the bottom surface in the depth direction of the groove 12a of the operation shaft 12 is inclined so that one is deepened and the other is shallowed. . As shown in FIGS. 15A and 15B, the locking portion 18 a does not engage with the groove portion 12 a in the middle of unlocking the operation shaft 12. On the other hand, the locking portion 18a engages with the groove 12a only when the deep groove 12a in the depth direction is positioned vertically downward, that is, when the door pivot shaft 4 protrudes.

  Moreover, in Example 7, as shown to Fig.16 (a) and (b), the convex part 12f equivalent to the latching | locking part 18a is provided in the operating shaft 12, and the movable part 18 is equivalent to the groove part 12a. A recess 18c is provided. As shown in FIG. 16B, the convex portion 12 f is not engaged with the concave portion 18 c in the middle of unlocking the operation shaft 12. On the other hand, the convex portion 12f engages with the concave portion 18c only when the convex portion 12f is positioned vertically downward, that is, only when the door pivot shaft 4 protrudes.

  The shape of the groove 12a or the recess 18c of the operation shaft 12 in the first to seventh embodiments is such that the door pivot shaft 4 protrudes, preferably only the door pivot shaft 4 protrudes to the maximum. Any shape that can engage the locking portion 18a or the convex portion 12f is used.

DESCRIPTION OF SYMBOLS 1 Pivot hinge 2 Case 2a Connection part 2b Notch 3 Plate 3a Screw 4 Door pivot shaft 4a Step part 5 Spring receiving part 6 Spring receiving part 6a Through-hole 7 Spring 8, 10, 14, 15, 17 Pin 9 2nd Link 9a Arc part 11 First link 12 Operation shaft 12a Groove part 12b Narrow part 12c Operation hole 12d Convex part 12e Flat part 12f Convex part 13 Internal housing 16 Elastic member 18 Movable part 18a Locking part 18b Long hole 18c Groove D Door D1 Door frame D2 Bearing D3 Insertion hole

Claims (6)

A housing, a door pivot shaft installed in the housing so as to be movable up and down, a protruding state in which the door pivot shaft projects from the upper end of the housing, and the door pivot shaft inside the housing An operation shaft for operating movement between the storage state housed in the storage state, a link mechanism for moving the door pivot shaft by rotation of the operation shaft, and the protruding state of the door pivot shaft. In a pivot hinge comprising a lock mechanism for restricting the rotation of the operation shaft,
The lock mechanism includes a movable portion that urges toward the operation shaft,
A pivot hinge characterized in that the rotation of the operating shaft is restricted by the engagement of the movable portion and the operating shaft . A groove formed in the operating shaft;
The pivot hinge according to claim 1 , wherein a locking portion formed on the movable portion is engaged. In the protruding state of the door pivot shaft,
The groove portion of the operation shaft is arranged in the vertical direction,
The pivot hinge according to claim 2 , wherein the movable portion is movable in the vertical direction by an urging force. An elastic member that urges the movable part toward the operating shaft is fixed to the housing.
In the retracted state of the door pivot journaling shaft, the elastic member is in contact with the link mechanism skilled pivot hinge according to any one of claims 1 to 3 biasing force toward the operating shaft is restricted. A groove is formed at the end of the operating shaft exposed from the side of the housing,
The pivot hinge according to any one of claims 2 to 4 , wherein the movable portion is housed in a cutout of a housing formed around the end portion. A housing,
A door pivot shaft installed in the housing so as to be movable up and down;
A spring for biasing the door pivot shaft in a direction protruding in a vertical direction from the upper end of the housing;
An operating shaft installed in a horizontal direction of the housing;
A first link pivotally connected to the operating shaft and rotated by the operating shaft;
A second link that pivotally connects an end of the first link and a lower end of the door pivot shaft;
A locking mechanism provided with a movable part installed in the housing and biased toward the operation shaft;
The distance between the pivoting portion of the door pivoting shaft and the second link and the operation shaft in a state where the door pivoting shaft protrudes from the upper end of the housing,
The distance between the pivoting portion of the door pivot shaft and the second link and the pivoting portion of the second link and the first link;
And smaller than the sum of the distances between the pivoting portion of the second link and the first link and the operation shaft,
The door pivot shaft is configured to be housed in the housing through the first link and the second link by the operation of the operation shaft.
The pivoting portion of the first link and the second link at the time of protrusion and storage of the door pivot shaft stops at a position beyond the vertical axis of the door pivot shaft;
In the state where the door pivot shaft protrudes,
A pivot hinge that restricts rotation of the operation shaft by engaging the movable portion and the operation shaft.

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