JP7006325B2 - Latch mechanism, latch pin mechanism and hinge - Google Patents

Description

The present invention relates to a hinge used in a deployable structure such as a solar cell paddle or a large flat plate antenna, and particularly relates to a latch mechanism for maintaining a predetermined deployed state.

In recent years, artificial satellite solar array paddles require a large number of panels due to the demand for high power consumption. A large number of such panels are folded and stored at the time of launch, and are deployed in a predetermined planar shape on the orbit. The hinge used for such a deploying panel is provided with a latch mechanism for maintaining the deployed state, and various hinges provided with 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 by utilizing a cam structure in which a convex portion fits with a concave portion. Further, Patent Document 2 discloses a device in which a member having a tooth-like surface and a member having a groove are provided in contact with each other on a hinge shaft portion, and the hinge is locked by engaging them.

Japanese Unexamined Patent Publication No. 3-125773 U.S. Patent Application Publication No. 2014/0259532

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

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

Therefore, an object of the present invention is to provide a hinge, a latch mechanism thereof, and a latch pin mechanism, which can be reduced in size and weight and can maintain the deployed state of the deployed structure with sufficient rigidity.

According to the first aspect of the present invention, the hinge mechanism of the hinge having the first arm and the second arm is fixed to the first arm, and the hinge provided with the latch pin receiving portion having the first cross-sectional shape. A hinge including a shaft support portion and a latch pin inserted into the latch pin accommodating portion having the first cross-sectional shape, the latch pin accommodating portion is provided so as to correspond to the latch pin receiving portion, and is fixed to the second arm. It is composed of a shaft, and the latch pin can be slid only in the axial direction of the hinge shaft between the latch pin receiving portion and the latch pin accommodating portion, and is urged outward from both ends of the hinge shaft. 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 extending outward from the first cross-sectional shape. The hinge shaft support portion is composed of a protrusion having a small second cross-sectional shape, the contact portion where the tip of the protrusion abuts on the latch pin receiving portion, and the protrusion at a predetermined position of the contact portion. In a state where the protrusion of the latch pin is in contact with the contact portion of the corresponding hinge shaft support portion, all of the main body portions of the latch pin have the hinge shaft. The first and second arms are relatively rotatable about the shaft portion of the latch pin, and the protruding portion of the latch pin is the protrusion of the hinge shaft support portion. When the abutting portion slides into the opening and is fitted, a part of the main body portion of the latch pin slides from the latch pin accommodating portion of the hinge shaft to the latch pin receiving portion of the hinge shaft support portion. Latch the hinge.
According to the second aspect of the present invention, the hinge pin mechanism of the hinge having the first arm and the second arm has the hinge.
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 has a contact portion and a contact portion. The hinge shaft support portion provided with an opening formed at a predetermined position and the hinge shaft accommodating portion fixed to the second arm and having the first cross-sectional shape are at least at the end. The hinge pin accommodating portion has the hinge shaft corresponding to the latch pin receiving portion, and the latch pin mechanism is inserted into the latch pin accommodating portion of the hinge shaft, and the latch pin receiving portion and the latch pin accommodating portion are provided. The latch pin has a latch pin that can slide only in the axial direction of the hinge shaft, and an urging means that urges the latch pin outward from the end portion of the hinge shaft. A main body portion having a first cross-sectional shape, a shaft portion extended outward from the main body portion, and a second cross-sectional shape smaller than the first cross-sectional shape with a part of the shaft portion further extended outward. In a state where the protrusion of the latch pin is in contact with the abutting portion of the corresponding hinge shaft support, all of the main body of the latch pin is the hinge shaft. The first and second arms are relatively rotatable about the shaft portion of the latch pin, and the protrusion of the latch pin is the contact of the hinge shaft support portion. When the hinge pin is moved from the portion to the opening and fitted, a part of the main body portion of the latch pin slides from the latch pin accommodating portion of the hinge shaft to the latch pin receiving portion of the hinge shaft support portion, and the hinge is latched. do.
According to the third aspect of the present invention, the hinge having the first arm and the second arm has the latch mechanism, and the hinge shaft support portion is provided at each of the two arm ends of the first arm. , The latch pin receiving portion is provided at each arm end, the latch pin accommodating portion is arranged at both ends of the hinge shaft corresponding to each of the latch pin receiving portions, and the latch pin is attached to each of the latch pin accommodating portions at both ends. It is housed and each latch pin is urged toward the outside of the hinge shaft.

According to the present invention, the size and weight can be reduced, 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. 2 (A) is a schematic front sectional view showing an example of the configuration of the hinge shaft portion according to the present embodiment, FIG. 2 (B) is a sectional view taken along line I-I of the hinge shaft in FIG. 2 (A), and FIG. (C) is a side view of the hinge shaft support portion in FIG. 2 (A). 3 (A) is a schematic perspective view of the latch pin according to the present embodiment, FIG. 3 (B) is a front view of the latch pin of FIG. 3 (A), and FIG. 3 (C) is the latch pin II-in FIG. 3 (B). It is a cross-sectional view of line II. FIG. 4A is a front sectional view showing a latch state of the hinge according to the present embodiment, and FIG. 4B is a side view as well. 5 (A) is a front sectional view showing a closed state of the hinge according to the present embodiment, and FIG. 5 (B) is also a side view. FIG. 6A is a front sectional view showing a state in which the hinge is expanded by 90 ° according to the present embodiment, and FIG. 6B is also a side view. FIG. 7A is a front sectional view showing a state in which the hinge is expanded by 180 ° and latched according to the present embodiment, and FIG. 7B is also a side view. FIG. 8A is a side view showing a state in which a panel using a hinge according to the present embodiment is folded, and FIG. 8B is a side view showing a state in which the panel is also expanded 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 fixes the shaft and the shaft support portion in 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 can move only in the axial direction between the inside of the hinge shaft and the inside of the shaft support, the shaft portion extends from the main body portion toward the outside of the shaft, and the protruding portion is a part of the shaft portion further outward. It is a stretched one. The hinge is rotatable when the tip of the protrusion of the latch pin is in contact with the shaft support. When the protrusion rotates and fits into the opening of the shaft support, a portion of the latch pin body slides from the shaft to the shaft support to latch the further deployment of the hinge. Since the main body of the latch pin fixes the shaft and the shaft support, high rigidity can be obtained, and further, by providing a latch mechanism in the shaft, compactness and weight reduction can be achieved.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. It should be noted that FIGS. 1 to 7 are illustrative to explain the configuration and operation of the hinge according to the embodiment of the present invention, and do not show the actual shape and dimensions of each component and the actual ratio of the dimensions. do not have. Further, the pair of members are distinguished by adding subscripts A and B to a common reference number, but the shapes and functions of these members are the same. Therefore, when explaining a common shape and function, a pair of members shall be indicated only by a reference number without the subscripts A and B.

1. 1. Deployment Hinge Mechanism The hinge 100 exemplified in FIG. 1 includes a first arm 10, a second arm 20, and a latch pin mechanism 30. The hinge 100 may also be provided with deploying urging means for urging the first arm 10 and the second arm 20 in the opening direction. Here, as an example, a deployment spring 40 is provided as a deployment urging means.

The first arm 10 is composed of 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 shaft AH. The hinge shaft support portion 101A is internally formed with a latch pin receiving portion 102A having a predetermined cross-sectional shape, and similarly, the hinge shaft support portion 101B is internally formed with a latch pin receiving portion 102B having a predetermined cross-sectional shape. .. 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 a mounting portion 105 for fixing the deployed structure.

The second arm 20 is composed of a U-shaped arm, and one hinge shaft 201 is fixed to both ends of the arm along the hinge shaft AH. Latch pin accommodating portions 202A and 202B having a predetermined cross-sectional shape are formed inside both ends of the hinge shaft 201, respectively. In the present embodiment, the hinge shaft 201 is a cylindrical member having a hollow portion having a predetermined cross-sectional shape formed inside. The second arm 20 is provided with a mounting portion 203 for fixing the deployed 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 portion 303A having a predetermined cross-sectional shape, a shaft portion 304A having a circular cross section extending outward from the main body portion 303A, and a protruding portion 305A in which a part of the shaft portion 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 having a part of the shaft portion 304B further extended. .. 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 a size and a shape that can be fitted to 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 around the hinge axis AH. Further, it is desirable that the cross-sectional shape has a shape that can obtain the required strength and can be as light as possible (that is, thin). A desirable example of a shape satisfying such a condition is a regular polygon centered on the hinge axis AH. In the following description, a regular hexagonal cross-sectional shape will be illustrated as a typical example.

As shown in FIG. 1, the latch pin mechanism 30 is housed in the hollow portion of the hinge shaft 201. Further, a deployment spring 40 is arranged around the hinge shaft 201. The latch pin accommodating portions 202A and 202B of the hinge shaft 201 are arranged so as to be aligned with the positions of the hinge shaft support portions 101A and 101B, respectively. The latch pins 301A and 301B are always urged by the latch spring 302 in a direction away from each other. Therefore, the latch pins 301A and 301B are urged into the latch pin receiving portions 102A and 102B, respectively, whereby the protrusions 305A and 305B abut on the contact portions 103A and 103B and are fitted into the openings 104A and 104B, respectively. It will be possible. The latch pin 301 having a regular hexagonal cross section can move only in the hinge axis AH direction in the latch pin accommodating portion 202 and the latch pin receiving portion 102. Further, the deploying spring 40 is assumed to urge the first arm 10 and the second arm 20 in the deploying direction by hooking both ends thereof on the first arm 10 and the second arm 20, respectively.

2. 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 303 of the latch pin 301 having a regular hexagonal cross section can move from the latch pin accommodating portion 202 to the latch pin accommodating portion 102 side when the phases of the cross-sectional shapes of the latch pin receiving portion 102 and the latch pin accommodating portion 202 match. ..

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 the regular hexagon divided into equal parts. As described above, the opening 104 may be fitted with the protrusion 305 of the latch pin. Therefore, considering that the protrusion 305 needs to abut on the contact portion 103 and slide, the shape of the opening 104 can be determined from the viewpoint of the required mechanical strength and ease of manufacture. .. For example, it may be a shape in which two-thirds of a regular hexagon around the rotation axis, for example, two adjacent regular triangles among the six regular triangles constituting the regular hexagon are cut out.

3. 3. Latch pin 3.1) Structure As illustrated in FIG. 3, the latch pin 301 includes a main body 303 having a regular hexagonal cross section, a shaft portion 304 having a circular cross section extending outward from the main body 303 in the hinge axial direction, and a shaft. A part of the portion 304 is composed of a protruding portion 305 that is further extended. The regular hexagonal cross section of the main body 303 has a size that fits into the latch pin receiving portion 102 and the latch pin accommodating portion 202 and can move only in the hinge axial direction. The length of the shaft portion 304 in the hinge shaft AH direction is set so as to sufficiently function as a hinge shaft as described later. Further, the length of the protrusion 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 accommodating portion 202 to the latch pin receiving portion 102 to obtain a strong latch. Is set to.

As typically shown in FIG. 3B, the cross-sectional shape of the shaft portion 304 is a circle slightly smaller than the circle inscribed in the regular hexagon of the main body portion 303. Therefore, when the entire 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 in the hinge shaft support portion 101. To.

In the present embodiment, the cross section of the protruding portion 305 has a shape obtained by extending the semicircular portion of the cylindrical shaft portion 304. The reason why the cross section of the protruding portion 305 is a semicircle is to correspond to the shape of the opening 104 of the latch receiving portion 102 illustrated in FIG. 2 (C). It is not necessary to match the cross section of the protrusion 305 with the shape of the opening 104, but as described above, the protrusion 305 needs to fall into the opening 104 at a desired hinge angle. 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, it is desirable that the cross-sectional shape of the protruding portion 305 of the latch pin 301 is semicircular as shown in FIG. .. As described above, since the semicircle of the protrusion 305 is slightly smaller than the circle inscribed in the regular hexagon of the main body 303, it fits smoothly into the opening 104. As another example, if the opening 104 has a partial shape of 2/3 of the rotation axis of the cross-sectional shape (regular hexagon) of the latch pin receiving portion 102, the cross-sectional shape of the protruding portion 305 of the latch pin 301 may be semi-circular. , It may be a fan shape with a central angle of 240 ° according to the opening 104.

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

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 accommodating portion 202 of the hinge shaft 201. Slides toward the latch pin receiving portion 102, and the tip portion of the shaft portion 304 of the latch pin 301 abuts on the abutting portion 103 and stops. In this state, the main body portion 303 is fitted to 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 303 of the latch pin 301 fixes the hinge shaft 201 urged in the deployment direction by the deployment spring 40 and the hinge shaft support portion 101 in 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. By sliding the latch pin 301 in the direction of the hinge axis in this way, the hinge can be firmly latched. Hereinafter, the latch operation of the hinge 100 according to the present embodiment will be described with reference to FIGS. 5 to 7.

4. Latch operation In the hinge 100 illustrated in FIG. 5, the first arm 10 and the second arm 20 are in a closed state, and the hinge 100 is rotated in an opening direction by a mechanism (not shown), for example, a deploying 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 tip of the protruding portion 305 of the latch pin 301 abuts on the contact portion 103. 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 abuts on the contact portion 103 and is pressed. In this state, all of the regular hexagonal main body 303 of the latch pin 301 is fitted and accommodated in the latch pin accommodating portion 202, and the shaft portion 304 of the circular cross section of the latch pin 301 and the protruding portion 305 of the 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 around the shaft portion 304 of the latch pin 301 as the central axis.

In the hinge 100 illustrated in FIG. 6, the first arm 10 and the second arm 20 are in a state of being opened by 90 °. In this half-opened state, as shown in FIG. 6 (B), half of the tip of the protruding portion 305 of the latch pin 301 (corresponding to a 90 ° fan shape) abuts on the contact portion 103, and thus as shown in FIG. 6 (A). In addition, the regular hexagonal main body portion 303 of the latch pin 301 is maintained in a state in which all of the regular hexagonal main body portion 303 is fitted and accommodated in the latch pin accommodating portion 202. Therefore, 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 around the shaft portion 304 of the latch pin 301 as a central axis. Is.

In the hinge 100 illustrated in FIG. 7, the first arm 10 and the second arm 20 are in a state of being opened by 180 °. In this fully open state, as shown in FIG. 7B, the protruding portion 30 of the latch pin 301 overlaps with the opening 104. Since the latch pin 301 is urged outward by the latch spring 302, the protrusion 350 fits with the opening 104, and the latch pin 301 slides outward by the length of the protrusion 305. As a result, the main body portion 303 is in a state of being fitted to 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 303 of the latch pin 301 can firmly fix the first arm 10 and the large arm 20 in the hinge rotation direction. By sliding the latch pin 301 in the direction of the hinge axis in this way, the hinge can be firmly latched.

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

As illustrated in FIG. 8A, a deployable structure composed of a plurality of panels P1 to P3 is deployably connected by a hinge 100. Since the hinge 100 according to the present embodiment becomes a strong latch state when deployed to a predetermined deployment angle, the state in which the panels P1 to P3 are deployed in a plane is maintained with high rigidity as shown in FIG. 8 (B). It becomes possible.

Further, since a strong latch state can be realized simply by sliding the latch pin 301 in the axial direction, a latch mechanism can be provided in the hinge shaft, and the total mass of the solar cell paddle can be reduced to, for example, 1/5 or less of the conventional one. can do. Further, by changing the material of the hinge 100 from an aluminum alloy to a titanium alloy and optimizing the shape for ensuring rigidity, further miniaturization and weight reduction become possible.

5. Effect As described above, according to one 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 expansion. It slides from the inside of the hinge shaft 201 to the outside hinge shaft support 101 at an angle. The slide of the latch pin 301 firmly fixes the hinge shaft 201 and the hinge shaft support portion 101 in the direction of rotation.

Further, the number of parts can be reduced by providing the latch mechanism on 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 save space and reduce the size and weight of the hinge mechanism.

INDUSTRIAL APPLICABILITY The present invention can be used as a deployment mechanism for a solar cell paddle or the like of an artificial satellite that is lightweight and requires high strength or rigidity.

10 1st arm 20 2nd arm 30 Latch pin mechanism 40 Deployment spring 100 Hinge 101 Hinge shaft support 102 Latch pin receiving part 103 Abutment part 104 Opening part 105 Mounting part 201 Hinge shaft 202 Latch pin accommodating part 203 Mounting part 301 Latch pin 302 Latch spring 303 Main body 303a Tapered 304 Shaft 305 Protruding part

Claims (7)

A hinge latch mechanism with 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 the first cross-sectional shape, and a hinge shaft support portion.
A hinge shaft including a latch pin inserted into the latch pin accommodating portion having the first cross-sectional shape, the latch pin accommodating portion being provided so as to correspond to the latch pin receiving portion, and fixed to the second arm.
Consists of
The latch pin 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 urged outward from both ends of the hinge shaft.
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 extending outward to be smaller than the first cross-sectional shape. Consists of a protrusion having a second cross-sectional shape,
The hinge shaft support portion has an abutting portion where the tip of the projecting portion abuts on the latch pin receiving portion, and an opening in which the projecting portion fits at a predetermined position of the abutting portion.
In a state where the protruding portion of the latch pin is in contact with the abutting portion of the corresponding hinge shaft support portion, all of the main body portion of the latch pin is housed in the latch pin accommodating portion of the hinge shaft, and the latch pin is accommodated. The first and second arms are relatively rotatable about the shaft portion, and the first and second arms are relatively rotatable.
When the protruding portion of the latch pin slides from the contact portion of the hinge shaft support portion to the opening portion and is fitted, a part of the main body portion of the latch pin is formed from the latch pin accommodating 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. The latch mechanism according to claim 1 , wherein the first cross-sectional shape is a regular polygon . The latch mechanism according to claim 1 or 2 , wherein the shaft portion of the latch pin has a circular cross-sectional shape smaller than the first cross-sectional shape, and the protruding portion has a fan-shaped cross-sectional shape which is a part of the circular shape. A hinge pin mechanism with a first arm and a second arm.
The hinge
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 has a contact portion and a contact portion. The hinge shaft support portion provided with an opening formed at a predetermined position, and the hinge shaft support portion.
A hinge shaft fixed to the second arm, the hinge shaft 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.
Have,
The latch pin mechanism
A latch pin that is inserted into the latch pin accommodating 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 accommodating portion.
An urging means for urging the latch pin outward from the end of the hinge shaft,
The latch pin has
The main body having the first cross-sectional shape and
A shaft portion extending outward from the main body portion and a shaft portion
A protrusion having a second cross-sectional shape smaller than the first cross-sectional shape, with a part of the shaft portion extending further outward.
Have,
In a state where the protruding portion of the latch pin is in contact with the abutting portion of the corresponding hinge shaft support portion, all of the main body portion of the latch pin is housed in the latch pin accommodating portion of the hinge shaft, and the latch pin is accommodated. The first and second arms are relatively rotatable about the shaft portion, and the first and second arms are relatively rotatable.
When the protruding portion of the latch pin moves from the contact portion of the hinge shaft support portion to the opening portion and is fitted, a part of the main body portion of the latch pin is said from the latch pin accommodating portion of the hinge shaft. A latch pin mechanism that slides to the latch pin receiving portion of the hinge shaft support portion and latches the hinge. The latch pin mechanism according to claim 4 , wherein the first cross-sectional shape is a regular polygon . The latch pin mechanism according to claim 4 or 5 , wherein the shaft portion of the latch pin has a circular cross-sectional shape smaller than the first cross-sectional shape, and the protruding portion has a partially circular cross-sectional shape of the circular cross-sectional shape. .. A hinge having the latch mechanism according to any one of claims 1 to 3 .
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.
The latch pin accommodating portions are arranged at both ends of the hinge shaft corresponding to each of the latch pin receiving portions.
A hinge in which the latch pin is housed in each of the latch pin accommodating portions at both ends, and each latch pin is urged outward in the axial direction of the hinge shaft.

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