JP2019132367A - Latch mechanism, latch pin mechanism, and hinge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hinge capable of realizing compactness and weight reduction and maintaining a deployed state of a deployed structure with sufficient rigidity, a latch mechanism thereof, and a latch pin mechanism. SOLUTION: A hinge shaft support portion (101) provided with a latch pin receiving portion (102), a hinge shaft (201) formed with a latch pin accommodating portion (202), and a latch pin accommodating portion slide only in the hinge axis direction. With a possible latch pin (301), the latch pin has a body portion (303), a shaft portion (304) and a protrusion (305), and the protrusion of the latch pin is a contact portion (103) of the hinge shaft support portion. ) To the opening (104), a part of the main body (303) slides from the latch pin accommodating portion (202) to the latch pin receiving portion (102) to latch the hinge. [Selection diagram] Fig. 1

Description

  The present invention relates to a hinge used in a deployment structure such as a solar cell paddle or a large flat antenna, and more particularly to a latch mechanism that maintains a predetermined deployment state.

  In recent years, solar cell paddles for artificial satellites require a large number of panels due to the demand for high power. A large number of such panels are folded and stored at the time of launch, and developed into a predetermined planar shape on the track. A hinge mechanism used for such a deployment panel is provided with a latch mechanism for maintaining the deployed state, and various hinges having such a latch mechanism have been proposed so far.

  For example, Patent Document 1 discloses a hinge that locks a movable shaft at a predetermined angle using a cam structure in which a convex portion is fitted to a concave portion. Patent Document 2 discloses a device that locks a hinge by providing a member having a toothed surface and a member having a groove on the hinge shaft portion so as to be able to contact each other and engaging them.

Japanese Patent Laid-Open No. 3-125773 US Patent Application Publication No. 2014/0259532

  However, all of the hinge mechanisms disclosed in the above-mentioned patent documents are latch structures whose main purpose is to open and close a small torque, and are not suitable for structures that require high rigidity in a deployed state, such as solar cell paddles. .

  Further, when a latch mechanism having high rigidity is provided separately from the hinge, an increase in the number of mounted parts and an increase in mass are caused, making it difficult to reduce the size and weight. In particular, when mounted on an artificial satellite, an increase in the number of mounted components and an increase in mass should be avoided.

  Accordingly, an object of the present invention is to provide a hinge, a latch mechanism thereof, and a latch pin mechanism that can realize a reduction in size and weight and can maintain a deployed state of a deployed structure with sufficient rigidity.

According to the first aspect of the present invention, the unfolding latch mechanism of the hinge having the first arm and the second arm is fixed to the first arm, and the latch pin receiving portion having the first cross-sectional shape is provided. A hinge shaft support portion and a latch pin housing portion having the first cross-sectional shape are provided so as to correspond to the latch pin receiving portion, the hinge shaft fixed to the second arm, and the latch pin housing portion of the hinge shaft A latch pin that is slidable only in the axial direction of the hinge shaft between the latch pin receiving portion and the latch pin housing portion and is urged outward from the end portion of the hinge shaft. The latch pin includes a main body portion having the first cross-sectional shape, a shaft portion extending outward from the main body portion, and a part of the shaft portion extending further outward. And a protrusion having a second cross-sectional shape smaller than the first cross-sectional shape, wherein the hinge shaft support portion is in contact with the abutment portion where the tip of the protrusion is in contact with the latch pin receiving portion. An opening into which the protrusion fits at a predetermined position of the contact portion, and the protrusion of the latch pin slides and fits into the opening from the contact portion of the hinge shaft support portion. A part of the main body portion of the latch pin slides from the latch pin housing portion of the hinge shaft to the latch pin receiving portion of the hinge shaft support portion, and latches the hinge.
According to a second aspect of the present invention, in the latch pin mechanism of the hinge having the first arm and the second arm, the hinge is a hinge shaft support portion fixed to the first arm, and the hinge shaft The hinge shaft support portion, wherein the support portion includes a latch pin receiving portion having a first cross-sectional shape, and the latch pin receiving portion is provided with a contact portion and an opening formed at a predetermined position of the contact portion; A hinge shaft fixed to the second arm, having a latch pin accommodating portion having the first cross-sectional shape at least at an end, and the latch pin accommodating portion corresponding to the latch pin receiving portion; The latch pin mechanism is inserted into the latch pin accommodating portion of the hinge shaft, and the hinge shaft is interposed between the latch pin receiving portion and the latch pin accommodating portion. A latch pin that is slidable only in the axial direction of the hinge shaft, and a biasing means that biases the latch pin outward from the end of the hinge shaft, the latch pin having the first cross-sectional shape. A main body portion, a shaft portion extending outward from the main body portion, a protruding portion having a second cross-sectional shape smaller than the first cross-sectional shape with a part of the shaft portion extending further outward, And when the projecting portion of the latch pin moves from the contact portion of the hinge shaft support portion to the opening and is fitted, a part of the main body portion of the latch pin is the latch pin of the hinge shaft. The hinge slides from the receiving portion to the latch pin receiving portion of the hinge shaft support portion to latch the hinge.
According to a third aspect of the present invention, a hinge having a first arm and a second arm has the latch mechanism, and the hinge shaft support is provided at each of the two arm ends of the first arm. The latch pin receiving portion is provided at each arm end, and the latch pin accommodating portion is disposed at both ends of the hinge shaft corresponding to each of the latch pin receiving portions, and the latch pin is disposed at each of the latch pin accommodating portions at both ends. The latch pins are accommodated and biased toward the outside of the hinge shaft.

  According to the present invention, a reduction in size and weight can be realized, and the deployed state of the deployed structure can be maintained with sufficient rigidity.

FIG. 1 is an exploded perspective view showing a schematic structure of a hinge according to an embodiment of the present invention. 2A is a schematic front sectional view showing an example of the configuration of the shaft portion of the hinge according to the present embodiment, FIG. 2B is a sectional view taken along the line II of the hinge shaft in FIG. FIG. 3C is a side view of the hinge shaft support portion in FIG. 3A is a schematic perspective view of the latch pin according to the present embodiment, FIG. 3B is a front view of the latch pin of FIG. 3A, and FIG. 3C is II− of the latch pin in FIG. It is II sectional view. FIG. 4A is a front sectional view showing a latched state of the hinge according to the present embodiment, and FIG. 4B is a side view of the same. FIG. 5A is a front sectional view showing a closed state of the hinge according to the present embodiment, and FIG. 5B is a side view of the same. FIG. 6A is a front sectional view showing a state in which the hinge according to the present embodiment is developed by 90 °, and FIG. 6B is a side view of the same. FIG. 7A is a front sectional view showing a state in which the hinge according to the present embodiment is expanded and latched by 180 °, and FIG. 7B is a side view of the same. FIG. 8A is a side view showing a state in which the panel using the hinge according to the present embodiment is folded, and FIG. 8B is a side view showing the same state in which the panel is unfolded and latched.

<Outline of Embodiment>
According to the embodiment of the present invention, a part of the latch pin built in the shaft of the hinge slides from the inside of the shaft to the outside shaft support portion at a predetermined deployment angle, and the shaft and the shaft support portion are fixed with respect to the rotation direction. This realizes a strong latch of the hinge.

  The latch pin has a shape including a main body portion, a shaft portion, and a protruding portion. The main body portion can move only in the axial direction between the shaft of the hinge and the shaft support portion, the shaft portion extends from the main body portion toward the outside of the shaft, and a part of the shaft portion extends further outward. Stretched. The hinge is rotatable in a state where the tip of the protruding portion of the latch pin is in contact with the shaft support portion. When the protruding portion rotates and fits into the opening of the shaft support portion, a part of the latch pin body portion slides from the shaft to the shaft support portion to latch further development of the hinge. Since the main body portion of the latch pin fixes the shaft and the shaft support portion, high rigidity can be obtained, and further, a reduction in size and weight can be achieved by providing a latch mechanism in the shaft.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. 1 to 7 are illustrated for explaining the configuration and operation of the hinge according to one embodiment of the present invention, and do not show the actual shape and size of each component and the actual ratio of the dimensions. Absent. A pair of members are distinguished by adding subscripts A and B to a common reference number, but the shape and function of these members are the same. Therefore, when a common shape and function are described, a pair of members is indicated only by reference numerals without subscripts A and B.

1. Deployment Hinge Mechanism A hinge 100 illustrated in FIG. 1 includes a first arm 10, a second arm 20, and a latch pin mechanism 30. In addition, the hinge 100 can also be provided with a deployment urging means that urges the first arm 10 and the second arm 20 in the opening direction. Here, as an example, the deployment spring 40 is provided as a deployment urging means.

  The first arm 10 is a U-shaped arm, and a pair of hinge shaft support portions 101A and 101B are provided at both ends of the arm along the hinge axis AH. The hinge shaft support portion 101A has a latch pin receiving portion 102A having a predetermined cross-sectional shape formed therein. Similarly, the hinge shaft support portion 101B has a latch pin receiving portion 102B having a predetermined cross-sectional shape formed therein. . Further, a contact portion 103A and an opening 104A are formed in the back of the latch pin receiving portion 102A, and similarly, a contact portion 103B and an opening 104B (not shown in FIG. 1) are formed in the back of the latch pin receiving portion 102B. .) And are formed. The first arm 10 is provided with an attachment portion 105 for fixing the development structure.

  The second arm 20 is a U-shaped arm, and one hinge shaft 201 is fixed to both ends of the arm along the hinge axis AH. At both ends of the hinge shaft 201, latch pin accommodating portions 202A and 202B having a predetermined cross-sectional shape are respectively formed. In the present embodiment, the hinge shaft 201 is a cylindrical member in which a hollow portion having a predetermined cross-sectional shape is formed. The second arm 20 is provided with a mounting portion 203 for fixing the unfolded structure.

  The latch pin mechanism 30 includes a pair of latch pins 301A and 301B and a latch spring 302. The latch pin 301A includes a main body part 303A having a predetermined cross-sectional shape, a shaft part 304A having a circular cross section extending outward from the main body part 303A, and a protruding part 305A in which a part of the shaft part 304A further extends. The cross-sectional shape of the main body portion 303A has the same shape as the latch pin receiving portion 102A of the hinge shaft support portion 101A and the latch pin accommodating portion 202A of the hinge shaft 201. Similarly, the latch pin 301B includes a main body portion 303B having a predetermined cross-sectional shape, a shaft portion 304B having a circular cross section extending outward from the main body portion 303B, and a protruding portion 305B in which a part of the shaft portion 304B further extends. . The cross-sectional shape of the main body portion 303B has the same shape as the latch pin receiving portion 102B of the hinge shaft support portion 101B and the latch pin accommodating portion 202B of the hinge shaft 201. The protrusions 305A and 305B have sizes and shapes that can be fitted into the openings 104A and 104B of the first arm 10 described above, respectively.

  The cross-sectional shape of the latch pin receiving portion 102, the latch pin accommodating portion 202, and the main body portion 303 of the latch pin 301 may be any shape that prevents the latch pin 301 from rotating about the hinge axis AH. Furthermore, it is desirable that the cross-sectional shape has a required strength and can be reduced in weight as much as possible (that is, thin). A desirable example of a shape satisfying such conditions is a regular polygon centered on the hinge axis AH. In the following description, a regular hexagonal cross-sectional shape is illustrated as a typical example.

  As shown in FIG. 1, the latch pin mechanism 30 is accommodated in the hollow portion of the hinge shaft 201. Further, a deployment spring 40 is disposed around the hinge shaft 201. The latch pin accommodating portions 202A and 202B of the hinge shaft 201 are arranged in accordance with the positions of the hinge shaft support portions 101A and 101B, respectively. The latch pins 301A and 301B are always urged away from each other by the latch spring 302. Accordingly, the latch pins 301A and 301B are urged toward the latch pin receiving portions 102A and 102B, respectively, whereby the projecting portions 305A and 305B abut against the abutting portions 103A and 103B and are fitted into the openings 104A and 104B, respectively. It becomes possible. The latch pin 301 having a regular hexagonal cross section is movable only in the direction of the hinge axis AH in the latch pin accommodating portion 202 and the latch pin receiving portion 102. Moreover, the expansion | deployment spring 40 shall urge the 1st arm 10 and the 2nd arm 20 to an expansion | deployment direction by hooking the both ends to the 1st arm 10 and the 2nd arm 20, respectively.

2. Shaft portion As illustrated in FIG. 2, the latch pin receiving portion 102 of the hinge shaft support portion 101 and the latch pin accommodating portion 202 of the hinge shaft 201 have the same regular hexagonal cross-sectional shape. Similarly, the main body portion 303 of the latch pin 301 having a regular hexagonal cross section can be moved from the latch pin receiving portion 202 to the latch pin receiving portion 102 when the phases of the cross-sectional shapes of the latch pin receiving portion 102 and the latch pin receiving portion 202 coincide. .

  The latch pin receiving portion 102 has a contact portion 103 and an opening portion 104 on the outer surface. As an example, the opening 104 in the present embodiment has a shape obtained by dividing the cross-sectional shape (regular hexagon) of the latch pin receiving portion 102 into two. However, the shape of the opening 104 is not limited to a regular hexagonal shape. As described above, the opening 104 only needs to be able to fit the protrusion 305 of the latch pin. Therefore, the shape of the opening 104 can be determined from the viewpoint of the required mechanical strength and ease of manufacture, considering that the protrusion 305 needs to slide against the contact portion 103. . For example, a shape obtained by cutting out two adjacent regular triangles out of two regular triangles around the rotation axis of the regular hexagon, for example, six regular triangles constituting the regular hexagon may be used.

3. 3. Latch Pin 3.1) Structure As illustrated in FIG. 3, the latch pin 301 includes a main body portion 303 having a regular hexagonal cross section, a shaft portion 304 having a circular cross section extending outward from the main body portion 303 in the hinge axis direction, and a shaft. A part of the part 304 includes a protruding part 305 further extending. The regular hexagonal cross section of the main body portion 303 has a size that fits into the latch pin receiving portion 102 and the latch pin accommodating portion 202 and is movable only in the hinge axis direction. The length of the shaft portion 304 in the hinge axis AH direction is set so as to sufficiently function as a hinge shaft as will be described later. Further, the length of the projection 305 in the hinge axis AH direction is such that the main body 303 having a regular hexagonal cross section slides a sufficient distance from the latch pin receiving portion 202 to the latch pin receiving portion 102, as will be described later, so that a strong latch is obtained. Set to

  As typically shown in FIG. 3B, the cross-sectional shape of the shaft portion 304 is a circle slightly smaller than a circle inscribed in the regular hexagon of the main body portion 303. Therefore, when all of the main body portion 303 is located in the latch pin accommodating portion 202, the hinge shaft support portion 101 and the hinge shaft 201 are rotatably supported by the shaft portion 304 of the latch pin 301 located on the hinge shaft support portion 101. The

  In the present embodiment, the cross section of the protruding portion 305 has a shape obtained by extending a semicircular portion of the cylindrical shaft portion 304. The reason why the cross section of the projecting portion 305 is a semicircle is to correspond to the shape of the opening 104 of the latch receiving portion 102 illustrated in FIG. Although it is not necessary to make the cross section of the protrusion 305 and the shape of the opening 104 coincide, the protrusion 305 needs to fall into the opening 104 at a desired hinge angle as described above. Therefore, if the opening 104 has a shape obtained by dividing the cross-sectional shape (regular hexagon) of the latch pin receiving portion 102 into two, the cross-sectional shape of the protruding portion 305 of the latch pin 301 is preferably semicircular as shown in FIG. . As described above, the semicircle of the projecting portion 305 is slightly smaller than the circle inscribed in the regular hexagon of the main body portion 303, and therefore fits smoothly into the opening 104. As another example, if the opening 104 is a 2/3 partial shape around the rotation axis of the cross-sectional shape (regular hexagon) of the latch pin receiving portion 102, the cross-sectional shape of the protrusion 305 of the latch pin 301 may be semicircular. A sector shape with a central angle of 240 ° may be used in accordance with the opening 104.

  As illustrated in FIG. 3C, a slight tapered portion 303 a is formed between the regular hexagonal portion of the main body portion 303 and the shaft portion 304. The taper portion 303a facilitates the movement of the latch pin 301 from the latch pin accommodating portion 202 to the latch pin receiving portion 102, thereby smoothly and reliably performing the latch operation due to the movement of the main body portion 303.

3.2) Latch State As illustrated in FIG. 4, when the protruding portion 305 of the latch pin 301 falls into the opening 104 of the hinge shaft support portion 101, the main body portion 303 of the latch pin 301 becomes the latch pin accommodation portion 202 of the hinge shaft 201. Slide toward the latch pin receiving portion 102, and the tip end portion of the shaft portion 304 of the latch pin 301 comes into contact with the contact portion 103 and stops. In this state, the main body portion 303 is fitted into both the latch pin accommodating portion 202 of the hinge shaft 201 and the latch pin receiving portion 102 of the hinge shaft support portion 101. Therefore, the main body portion 303 of the latch pin 301 fixes the hinge shaft 201 and the hinge shaft support portion 101 that are biased in the deployment direction by the deployment spring 40 with respect to the hinge rotation direction. Further, since the latch pin 301 is pressed against the contact portion 103 by the latch spring 302, it is fixed in the hinge axis direction. In this manner, the hinge can be firmly latched by sliding the latch pin 301 in the hinge axis direction. Hereinafter, the latch operation of the hinge 100 according to the present embodiment will be described with reference to FIGS.

4). Latching operation The hinge 100 illustrated in FIG. 5 is in a state in which the first arm 10 and the second arm 20 are closed, and is rotated in the opening direction by a mechanism (not shown), for example, a deployment spring 40. When the hinge is closed, as shown in FIG. 5B, the angle or phase of the latch pin 301 is set so that the entire front end of the protrusion 305 of the latch pin 301 contacts the contact portion 103. To do.

  Further, in the closed state, the touch spring 302 urges the latch pin 301 in the outward direction indicated by the arrow in the drawing, and the protruding portion 305 of the latch pin 301 contacts and is pressed against the contact portion 103. In this state, the regular hexagonal main body portion 303 of the latch pin 301 is entirely fitted and accommodated in the latch pin accommodating portion 202, and the shaft portion 304 having a circular cross section and the projecting portion 305 having a semicircular cross section. Is located in the latch pin receiving portion 102 of the hinge shaft support portion 101. Therefore, the hinge can be rotated about the shaft portion 304 of the latch pin 301 as the central axis.

  The hinge 100 illustrated in FIG. 6 is in a state where the first arm 10 and the second arm 20 are opened 90 degrees. In this half-open state, as shown in FIG. 6B, half of the tip of the protrusion 305 of the latch pin 301 (corresponding to a 90 ° fan shape) abuts against the abutting portion 103, and as shown in FIG. In addition, the regular hexagonal main body 303 of the latch pin 301 is maintained in a state where all of the main hexagonal body 303 is fitted and accommodated in the latch pin accommodating portion 202. Accordingly, the shaft portion 304 having a circular cross section and the projecting portion 305 having a semicircular cross section of the latch pin 301 are located in the latch pin receiving portion 102 of the hinge shaft support portion 101, and the hinge can be rotated about the shaft portion 304 of the latch pin 301 as a central axis. It is.

  The hinge 100 illustrated in FIG. 7 is in a state where the first arm 10 and the second arm 20 are opened 180 degrees. In this fully opened state, the protrusion 30 of the latch pin 301 overlaps the opening 104 as shown in FIG. Since the latch pin 301 is urged in the outward direction indicated by the arrow by the latch spring 302, the protrusion 350 is engaged with the opening 104, and the latch pin 301 slides outward by the length of the protrusion 305. As a result, the main body 303 is fitted into both the latch pin housing portion 202 of the hinge shaft 201 and the latch pin receiving portion 102 of the hinge shaft support portion 101. Therefore, the main body portion 303 of the latch pin 301 can firmly fix the first arm 10 and the large arm 20 in the hinge rotation direction. Thus, the hinge can be firmly latched by sliding the latch pin 301 in the hinge axial direction.

5). Application Example As described above, the hinge 100 according to the present embodiment can realize a small, lightweight and strong latch by incorporating a latch mechanism in the hinge shaft. Such a hinge 100 can be applied, for example, to a deployment hinge of a deployment structure such as a solar cell paddle of a satellite or a large flat antenna.

  As illustrated in FIG. 8A, a deployment structure including a plurality of panels P <b> 1 to P <b> 3 is connected by a hinge 100 so as to be deployable. Since the hinge 100 according to the present embodiment is firmly latched when deployed to a predetermined deployment angle, the state where the panels P1 to P3 are deployed in a single plane as shown in FIG. 8B is maintained with high rigidity. It becomes possible.

  Further, since a strong latch state can be realized simply by sliding the latch pin 301 in the axial direction, the latch mechanism can be provided in the hinge shaft, and the total mass of the solar cell paddle is reduced to, for example, 1/5 or less of the conventional one. can do. Furthermore, the material of the hinge 100 is changed from an aluminum alloy to a titanium alloy, and the shape that ensures rigidity can be optimized to further reduce the size and weight.

5). Advantageous Effects As described above, according to an embodiment of the present invention, the main body portion of the latch pin 301 built in the hinge shaft portion has a cross-sectional shape that prevents rotation, and a part of the main body portion 303 has a predetermined development. Slide from the inside of the hinge shaft 201 to the outside hinge shaft support 101 at an angle. By the sliding of the latch pin 301, the hinge shaft 201 and the hinge shaft support portion 101 are firmly fixed in the rotational direction.

  Furthermore, the number of parts can be reduced by providing a latch mechanism in the hinge shaft portion. Further, by mounting a torsion coil spring (deployment spring 40) that generates a deployment force on the shaft, it is possible to realize space saving and reduction in size and weight of the hinge mechanism.

  INDUSTRIAL APPLICABILITY The present invention can be used as a deployment mechanism for solar cell paddles for artificial satellites that are lightweight and require high strength or rigidity.

DESCRIPTION OF SYMBOLS 10 1st arm 20 2nd arm 30 Latch pin mechanism 40 Unfolding spring 100 Hinge 101 Hinge shaft support part 102 Latch pin receiving part 103 Contact part 104 Opening part 105 Attachment part 201 Hinge shaft 202 Latch pin accommodating part 203 Attachment part 301 Latch pin 302 Latch spring 303 Body 303a Taper 304 Shaft 305 Projection

Claims (10)

A latch mechanism of a hinge having a first arm and a second arm,
A hinge shaft support portion fixed to the first arm and provided with a latch pin receiving portion having a first cross-sectional shape;
A latch pin housing portion having the first cross-sectional shape is provided so as to correspond to the latch pin receiving portion, and a hinge shaft fixed to the second arm;
The hinge shaft is inserted into the latch pin accommodating portion, and is slidable only in the axial direction of the hinge shaft between the latch pin receiving portion and the latch pin accommodating portion, and is attached outward from the end portion of the hinge shaft. A biased latch pin,
Have
The latch pin has a main body portion having the first cross-sectional shape, a shaft portion extending outward from the main body portion, and a part of the shaft portion further extends outward to be smaller than the first cross-sectional shape. A protrusion having a second cross-sectional shape,
The hinge shaft support portion has a contact portion with which the tip of the protruding portion comes into contact with the latch pin receiving portion, and an opening portion into which the protruding portion fits at a predetermined position of the contact portion,
When the protruding portion of the latch pin slides and fits into the opening from the contact portion of the hinge shaft support portion, a part of the main body portion of the latch pin extends from the latch pin housing portion of the hinge shaft. A latch mechanism that slides to the latch pin receiving portion of the hinge shaft support portion and latches the hinge.   In a state where the protruding portion of the latch pin is in contact with the contact portion of the corresponding hinge shaft support portion, all of the main body portion of the latch pin is accommodated in the latch pin accommodating portion of the hinge shaft, The latch mechanism according to claim 1, wherein the first and second arms are relatively rotatable about the shaft portion.   The latch mechanism according to claim 1 or 2, wherein the first cross-sectional shape is a polygon inscribed in a circle smaller than the diameter of the hinge shaft.   The shaft portion of the latch pin has a circular cross-sectional shape smaller than the first cross-sectional shape, and the protrusion has a fan-shaped cross-sectional shape that is a part of the circular shape. Latch mechanism as described.   5. The latch mechanism according to claim 1, wherein the opening of the corresponding hinge shaft support portion is in a predetermined angle range centering on an axis of the hinge in the first cross-sectional shape. A latch pin mechanism of a hinge having a first arm and a second arm,
The hinge is
A hinge shaft support portion fixed to the first arm, wherein the hinge shaft support portion has a latch pin receiving portion having a first cross-sectional shape, and the latch pin receiving portion includes a contact portion and a contact portion of the contact portion. The hinge shaft support provided with an opening formed at a predetermined position;
A hinge shaft fixed to the second arm, having at least an end portion of a latch pin housing portion having the first cross-sectional shape, wherein the latch pin housing portion corresponds to the latch pin receiving portion;
Have
The latch pin mechanism is
A latch pin that is inserted into the latch pin housing portion of the hinge shaft and is slidable only in the axial direction of the hinge shaft between the latch pin receiving portion and the latch pin housing portion;
A biasing means for biasing the latch pin outward from the end of the hinge shaft;
And the latch pin is
A main body having the first cross-sectional shape;
A shaft portion extending outward from the main body portion;
A projecting portion in which a part of the shaft portion extends further outward and has a second cross-sectional shape smaller than the first cross-sectional shape;
And when the projecting portion of the latch pin moves from the contact portion of the hinge shaft support portion to the opening and is fitted, a part of the main body portion of the latch pin is the latch pin of the hinge shaft. A latch pin mechanism that slides from the housing portion to the latch pin receiving portion of the hinge shaft support portion to latch the hinge.   In a state where the protruding portion of the latch pin is in contact with the contact portion of the corresponding hinge shaft support portion, all of the main body portion of the latch pin is accommodated in the latch pin accommodating portion of the hinge shaft, The latch pin mechanism according to claim 6, wherein the first and second arms are relatively rotatable around the shaft portion.   The latch pin mechanism according to claim 6 or 7, wherein the first cross-sectional shape is a polygon inscribed in a circle smaller than the diameter of the hinge shaft.   The shaft portion of the latch pin has a circular cross-sectional shape smaller than the first cross-sectional shape, and the protrusion has a partial circular cross-sectional shape of the circular cross-sectional shape. The latch pin mechanism described in 1. A hinge having the latch mechanism according to claim 1,
The hinge shaft support portion is provided at each of the two arm ends of the first arm, and the latch pin receiving portion is provided at each arm end,
Corresponding to each of the latch pin receiving portions, the latch pin accommodating portions are disposed at both ends of the hinge shaft,
A hinge in which the latch pin is housed in each of the latch pin housing portions at both ends, and each latch pin is urged toward the outside in the axial direction of the hinge shaft.

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