JP2008291961A - Hinge mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hinge mechanism capable of fixing mutually connecting members at a plurality of rotating positions. <P>SOLUTION: This hinge mechanism A1 is provided with a fixed member 10, a support shaft 13 arranged at the fixing member 10, a rotating member 20 capable of rotating using the shaft 13 as a fulcrum point and interlocking with the shaft 13 in a manner relatively movable for a predetermined length in a radial direction of the shaft 13 and an elastic member 30 for always applying a tensile force between the shaft 13 and the rotating member 20. The rotating member 20 is provided with a projection part 22a projecting out in a direction to which the tensile force by the elastic member 30 works and the fixing member 10 is provided with a plurality of recessed parts 14a, 14b, 14c into which the projection part 22a can fit. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a hinge mechanism, and more particularly, to a chair or the like that is used when a leg portion or a backrest can be folded with respect to a seat portion.

  An example of this type of conventional hinge mechanism is disclosed in Patent Document 1, and this conventional hinge mechanism is shown in FIGS. 23 to 25 of the present application. The hinge mechanism X includes a bracket 915 that protrudes downward from the seat surface member 940 of the chair Y, and a leg member 960 that is rotatably connected to the bracket 915 via a support shaft 913. The bracket 915 has a U-shaped cross section having a pair of opposing side walls 915a and a back wall 915b that connects one side edges of the side walls 915a. A support shaft 913 is stretched between the pair of side walls 915a. On the other hand, the leg member 960 is rotatably supported with respect to the support shaft 913 so that the support shaft 913 is passed through a support hole 923 provided at the upper end portion thereof. The support hole 923 has a long hole shape extending in the longitudinal direction of the leg member 960. Thus, the leg member 960 is always elastically pulled toward the proximal end of the bracket 915 by a tension coil spring 930 provided between the leg member 960 and the bracket 915. The thickness dimension between the inner wall of the support hole 923 and the side wall of the leg member 960 in the leg member 960 substantially corresponds to the distance dimension between the support shaft 913 and the back wall 915b. The base end portion has a substantially arc-shaped outer shape centering on the upper end portion of the support hole 923.

  In the standing state of the leg member 960 shown in FIG. 23 and FIG. 24, the leg member 960 has taken the up position of the movable distance within the allowable range of the elongated hole-shaped support hole 923. As shown in FIG. 24, the support shaft 913 is located at the lower end of the support hole 923. At this time, since the portion of the side surface of the leg member 960 above the support shaft 913 is in contact with the back wall 915b, the leg member 960 is held in an upright state and cannot be folded and rotated. On the other hand, as shown by a solid line in FIG. 25, when the leg member 960 is pulled downward against the elasticity of the tension coil spring 930, the support shaft 913 is positioned at the upper end portion of the support hole 923. In this state, the side surface above the support shaft 913 of the leg member 960 does not contact the back wall 915b. Further, since the base end portion of the leg member 960 has a substantially arc shape centering on the upper end portion of the support hole 923, the leg member 960 is rotated in the folding direction as indicated by a virtual line in FIG. To be able to move.

  However, such a hinge mechanism X has a problem that the leg member 960 cannot be stably fixed in the folded state. Therefore, if the chair Y is to be carried while the leg member 960 is folded, there is a risk that the leg member 960 will inadvertently get up and come into contact with the person carrying it or those around it, or may be caught by surrounding objects. is there.

JP-A-1-141602

  The present invention has been conceived under the circumstances described above, and it is possible to fix members that are rotatably connected to each other at a plurality of rotational angle positions. It is an object of the present invention to provide a hinge mechanism that can easily perform an operation of rotating the.

  The hinge mechanism provided by the first aspect of the present invention includes a fixing member, a support shaft provided on the fixing member, and the support shaft that is rotatable with respect to the support shaft. A rotating member that is linked so as to be relatively movable in the radial direction of the supporting shaft, and an elastic member that constantly applies a tensile force between the supporting shaft and the rotating member. The moving member includes a convex portion projecting in a direction in which a tensile force by the elastic member acts, and the fixing member includes a plurality of concave portions into which the convex portion can be fitted.

  In a state in which the convex portion of the rotating member is fitted in one of the plurality of concave portions provided in the fixing member, the force that presses the convex portion and the concave portion against each other is given by the elastic member. Therefore, the mutual fitting state between the convex portion and the concave portion is not easily released. Accordingly, the rotating member is stably held at the predetermined rotating position with respect to the fixed member, and the rotating member does not rotate carelessly. On the other hand, by pulling the rotating member against the pulling force of the elastic member, the convex portion can be detached from the concave portion that has been fitted so far. It becomes possible to rotate around the center. In a state where the rotating member is rotated by a predetermined angle and the convex portion is fitted to another concave portion, the rotating member is stably held at the predetermined rotating position as described above.

  In a preferred embodiment, the fixing member includes a base portion and a pair of upstanding walls standing at a predetermined distance from the base portion, and the support shaft is suspended between the pair of upstanding walls. On the other hand, the rotating member connects a pair of plate-like portions positioned outside the upright walls and one end portions of the pair of plate-like portions so as to sandwich the pair of upright walls. A connecting portion and an elongated hole formed in each of the pair of plate-like portions, the elongated hole being rotatable with respect to both ends of the support shaft and sliding in the longitudinal direction of the elongated hole. The elastic member is movably engaged, and is constituted by a tension coil spring disposed between the connecting portion of the rotating member and the support shaft and extending in the long axis direction of the elongated hole. The convex portion is formed on the inner surface of the connecting portion of the rotating member. And, the plurality of recesses are formed respectively on the peripheral surface of the pair of upright walls of the fixing member.

  In a preferred embodiment, the portion connecting the plurality of recesses on the peripheral surfaces of the pair of upstanding walls has an arc shape with a constant radius centered on the support shaft.

  According to such a configuration, a range in which the rotating member can be relatively moved with respect to the support shaft against the elasticity of the elastic member can be regulated by the elongated hole. Is not pulled too much against the elasticity of the elastic member. Further, when the convex member is detached from the concave portion that has been fitted so far, and the rotary member is rotated so as to be fitted into another concave portion, the convex portion is made to be a pair of standing walls of the fixing member. Therefore, the rotation operation of the rotation member can be easily performed.

  In a preferred embodiment, an additional convex portion is formed on the other end of the pair of plate-like portions of the rotating member, while the additional portion is formed on the base portion of the fixing member. An additional recess is formed in which the protrusion can be fitted. According to such a configuration, at a predetermined rotation position, at least two protrusions provided on the rotation member are respectively fitted into recesses provided on the fixing member. The predetermined rotation position is more firmly maintained.

  Further, in a preferred embodiment, the plurality of recesses are formed at three positions at an angle of 90 ° about the support shaft. According to such a configuration, the use range of the hinge mechanism is widened such that two folding positions in opposite directions can be set with respect to the standing position of the rotating member with respect to the fixed member.

  Of the three concave portions, the second concave portion is preferably formed on a straight line that passes through the support shaft with respect to the base portion and is orthogonal to the bottom surface of the base portion. Furthermore, it is preferable that the additional convex portion and the additional concave portion are formed so as to be fitted to each other when the convex portion is fitted to the second concave portion. According to such a configuration, when the convex portion is fitted in the second concave portion and the rotating member takes an upright state, the fixing force of the rotating member in the upright state is further increased. Can do.

  The bench provided by the 2nd side of the present invention is a bench provided with a seat surface member and a leg member, and the fixed member in the hinge mechanism concerning the 1st side of the present invention is the above-mentioned seat surface member. It is connected to the back surface, The said rotation member is connected to the base end part of the said leg member, It is characterized by the above-mentioned.

  In such a bench, the leg member that can rotate with respect to the seat member can be easily rotated to select the standing state and the folded state, and the leg member is in the standing state and the folded state. And are stably maintained.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  1 to 9 show a first embodiment of a hinge mechanism according to the present invention. As shown in FIGS. 1 and 2, the hinge mechanism A <b> 1 includes a fixing member 10 and a rotating member 20 that can rotate with respect to a support shaft 13 provided on the fixing member 10.

  The fixing member 10 includes a base portion 11 and a pair of upstanding walls 12 that stand up from the base portion 11 at a predetermined interval. Between the pair of upright walls 12, a support shaft 13 extending in the lateral direction is provided in a spanning manner so that both end portions protrude from the outer surfaces of the upright walls 12 by a predetermined length. As shown in FIGS. 3 and 4, the outer peripheral surfaces of both standing walls 12 have an arc shape centered on the support shaft 13. On this arc-shaped outer surface, three concave portions 14a, 14b, and 14c are formed every 90 degrees with the support shaft 13 as the center. Among these, the second concave portion 14 b is formed on a straight line that passes through the support shaft 13 and is orthogonal to the bottom surface of the base portion 11. The fixing member 10 having such a configuration can be obtained by resin molding, for example.

  The rotating member 20 includes a pair of plate-like portions 21 positioned along the outer surfaces of the pair of standing walls 12 of the fixing member 10 and one end portion of these pair of plate-like portions 21 (upper side in FIGS. 1 and 2). And a connecting portion 22 for connecting the end portions). As shown in FIGS. 1 and 2, both plate-like portions 21 have long holes 23 whose minor diameter corresponds to the outer diameter of the support shaft 13 and whose major diameter is larger than the outer diameter of the support shaft 13. The both ends of the support shaft 13 are slidably engaged with the elongated hole 23. The major axis direction of the long hole 23 is set to a direction extending from one end portion of each plate-like portion 21 toward the other end portion. A through hole 24 is formed in the connecting portion 22 of the rotating member 20. Using the through hole 24, a pin 31 that spans the outlet portion 24 a of the through hole 24, the support shaft 13, A tension coil spring 30 having both ends connected to each other is disposed. The direction in which the tension force is applied by the tension coil spring 30 is matched with the major axis direction of the long hole 23. A portion of the inner surface of the connecting portion 22 facing the outer peripheral surface of the pair of standing walls 12 of the fixing member 10 can be fitted into a plurality of recesses 14a, 14b, 14c provided on the outer peripheral surface of the rising wall 12. A convex portion 22a is formed. In the embodiment shown in the figure, the convex portion 22a has a substantially trapezoidal shape, and the plurality of concave portions 14a, 14b, and 14c are also shaped so as to be able to fit snugly with the trapezoidal convex portion 22a. .

  An additional convex portion 22b is formed on the other end portion 21a (the lower end portion in FIGS. 1 and 2) of the pair of plate-like portions 21 of the rotating member 20. Further, in the base portion 11 of the fixing member 10, an additional concave portion 11 a into which the above-described additional convex portion 22 b can be fitted is formed at a portion located outside the pair of standing walls 12. In this embodiment, the additional convex portion 22b has a trapezoidal shape similar to the convex portion 22a, and the additional concave portion 11a is also configured so that the additional convex portion 22b fits snugly. The rotating member 20 can also be obtained by resin molding, for example.

  Next, the operation of the hinge mechanism A1 configured as described above will be described.

  1 to 4 show a state in which the convex portion 22a of the rotating member 20 is fitted in the second concave portion 14b among the three concave portions 14a, 14b, 14c provided on the fixing member 10. FIG. Yes. In this state, the rotating member 20 is positioned at one end of a relatively movable stroke permitted by the elongated hole 23 by the pulling force of the pulling coil spring 30, and the protruding portion 22 a is opposed to the pulling coil spring 30. It is closely fitted while receiving elasticity. At the same time, the additional convex portion 22 b is also closely fitted to the additional concave portion 11 a provided in the fixing member 10. Therefore, even if the rotational force acts on the rotating member 20 due to the external force centered on the support shaft 13, the protrusions 22a and the recesses 14b, and the additional protrusions 22b and the additional recesses 11a can be easily fitted to each other. Will not be released. In this way, the rotation member 20 is stably held at a predetermined rotation position.

  Next, when the rotating member 20 is pulled up within the allowable range of the elongated hole 13 against the pulling force of the pulling coil spring 30, as shown in FIGS. 5 and 6, the concave portion 14b with respect to the convex portion 22a, and the additional portion The fitting state of the additional concave portion 11 a with respect to the convex portion 22 b is released, and the rotating member 20 becomes rotatable about the support shaft 13. As shown in FIG. 7, in a state where the convex portion 22 a is in contact with the arcuate outer peripheral surface of the standing wall 12 of the fixing member 10, the convex portion 22 a is circular even if the lifting force on the rotating member 20 is released. By sliding the arcuate outer surface, the rotating member 20 can be continuously rotated. Then, when the rotating member 20 further rotates and the convex portion 22a corresponds to the other concave portion 14a as shown in FIGS. 8 and 9, the convex portion 22a is automatically moved by the tensile force of the tension coil spring 30. Thus, it is fitted into the other recess 14a. In this state, the position after the rotation of the rotation member 20 is stably held as described above.

  As described above, in the hinge mechanism A1 according to this embodiment, the rotating member 20 is rotated in a predetermined direction while being pulled up against the elasticity of the tension coil spring 30, thereby rotating the rotating member 20. A predetermined rotation angle 20 can be selected with respect to the fixing member 10, and the state after the rotation can be stably held. Further, in this embodiment, when the convex portion 22a is fitted to the second concave portion 14b among the three concave portions 14a, 14b, and 14c, the additional convex portion 22b is also fitted to the additional concave portion 11a at the same time. Thus, the rotation preventing action for the rotation member 20 can be made at two positions sandwiching the support shaft 13. When this hinge mechanism A1 is used for supporting the leg member 60 so as to be rotatable with respect to the seat surface member 40 of the bench B, for example, as will be described later, the standing state of the leg member 60 becomes stronger. This is convenient because it is held.

  10 to 13 show a second embodiment of the hinge mechanism according to the present invention. Similarly to the hinge mechanism A1 according to the first embodiment described above, the hinge mechanism A2 also includes a fixing member 10 and a rotating member 20 that can rotate around a support shaft 13 attached to the fixing member 10. I have. A tension coil spring 30 is interposed between the rotating member 20 and the support shaft 13. In these drawings, the same members or portions as those of the first embodiment shown in FIGS. 1 to 9 are denoted by the same reference numerals, and detailed description thereof is omitted, and the difference from the first embodiment. Will be described below.

  The fixing member 10 is provided with a pair of upright walls 12 rising from the base portion 11, and the support shaft 13 is provided so as to span the pair of upright walls 12. In this embodiment, however, two concave portions 14a and 14b are formed on the arcuate outer peripheral surfaces of the pair of upright walls 12, and the convex portion of the rotating member 20 is formed in one concave portion 14b. A stopper wall 15 that abuts against the side surface of the rotating member 20 when the portion 22a is fitted is formed. As shown well in FIG. 12 and FIG. 13, the one concave portion 14 b is formed at a position that is orthogonal to the bottom surface of the base portion 11 of the fixing member 10 and is shifted to one side from a straight line passing through the support shaft 13. ing. The other concave portion 14 a is formed in a linear direction that passes through the support shaft 13 and is parallel to the bottom surface of the base portion 11. On the other hand, the rotating member 20 has the same configuration as that used in the first embodiment, and the long holes 23 provided in the pair of plate-like portions 21 are formed at both ends of the support shaft 13. While being slidably engaged, a tension coil spring 30 is disposed between the support shaft 13 and the pin 31 installed on the upper surface of the rotating member 20. The rotating member 20 is formed with an additional convex portion 22b, and the base 11 of the fixing member 10 is formed with an additional concave portion 11a that fits into the additional convex portion 22b. The additional recess 11a is perpendicular to the bottom surface of the base portion 11 passing through the support shaft 13 so that the additional protrusion 22b is simultaneously fitted when the projection 22a is fitted to the one recess 14b. On the other hand, it is formed at a position shifted to the opposite side to the one concave portion 14b.

  Next, the operation of the hinge mechanism A2 according to the second embodiment will be described.

  As shown in FIGS. 12 and 13, in a state where the convex portion 22a of the rotating member 20 is fitted in one concave portion 14b of the fixing member 10, the additional convex portion 22b is also formed into the additional concave portion 11a at the same time. It is mated. Then, since the fitting state of these convex portions 22a and the concave portions 14b and the additional convex portions 22b and the additional concave portions 11a is maintained by the action of the tension coil spring 30, the convex portions 22a and the concave portions 14b, And the fitting state of the additional convex part 22b and the additional recessed part 11a is cancelled | released easily, and the rotation member 20 does not rotate carelessly. In addition, in the state shown in FIGS. 12 and 13, since the side wall of the rotating member 20 is in contact with the stopper wall 15, the rotating member 20 is rotated counterclockwise in FIGS. 12 and 13. Powerfully stopped. In order to rotate the rotating member 20, the rotating member 20 is pulled up against the elasticity of the pulling coil spring 30, the fitting of the convex portion 22 a with the concave portion 14 b is released, and the convex portion 22 a is raised to the standing wall 12. The arcuate outer peripheral surface of the is slid. When the rotating member 20 is further rotated and the convex portion 22a corresponds to the other concave portion 14a, the convex coil 22a is automatically fitted into the other concave portion 14a by the action of the tension coil spring 30, and thereafter The rotation member 20 is prevented from rotating.

  14 to 17 show a third embodiment of the hinge mechanism according to the present invention. Similarly to the hinge mechanism A1 according to the first embodiment, the hinge mechanism A3 also includes a fixing member 10 and a rotating member 20 that can rotate around a support shaft 13 attached to the fixing member 10. I have. A tension coil spring 30 is interposed between the rotating member 20 and the support shaft 13. In these drawings, the same members or portions as those of the first embodiment shown in FIGS. 1 to 9 are denoted by the same reference numerals, and detailed description thereof is omitted, and the differences from the first embodiment are different. The following will be described as the center.

  In this embodiment, as shown in FIG. 14, the additional recessed part 11a and the additional convex part 22b are formed in the front view rectangular shape. Furthermore, as shown in FIG. 15, an intermediate portion 25 is formed so as to block between the pair of upright walls 12. As shown in the cross section of FIG. 16, the intermediate portion 25 has a substantially U-shaped cross section and is formed so as to be integrated with the connecting portion 22. The U-shaped inner side is hollow, and this hollow portion corresponds to the through hole 24 in the hinge mechanism A1. Further, an additional convex portion 25 a is formed at the lower end portion of the intermediate portion 25. In the hinge mechanism A3, an additional concave portion 11b corresponding to the additional convex portion 25a is also formed. The cross section of the additional convex portion 25a and the additional concave portion 11b is formed in a trapezoidal shape similarly to the convex portion 22a and the concave portions 14a, 14b, and 14c in the hinge mechanism A1.

  Next, the operation of the hinge mechanism A3 according to the third embodiment of the present invention will be described.

  Also in the hinge mechanism A3, as in the hinge mechanism A1, in order to rotate the rotating member 20, the rotating member 20 is pulled up against the elastic force of the tension coil spring 30, and the convex portion 22a is fitted to the concave portion 14b. The joint 22 is released, and the convex portion 22a is slid on the arcuate outer peripheral surface of the upright wall 12. When the rotating member 20 is further rotated and the convex portion 22a corresponds to the other concave portions 14a and 14c, the convex coil 22a is automatically fitted into the other concave portions 14a and 14c by the action of the tension coil spring 30. Then, the subsequent rotation of the rotation member 20 is prevented. In the hinge mechanism A3, since the space between the pair of upright walls 12 is closed by the intermediate portion 25, there is no fear of clogging fingers between the pair of upright walls 12, and the hinge mechanism A3 can be used safely. Furthermore, since the additional concave portion 11a and the additional convex portion 22b are formed in a rectangular shape in plan view, once they are fitted, they are less likely to come off than in the case of the hinge mechanism A1. In addition, as shown in FIG. 17, in a state where the convex portion 22a of the rotating member 20 is fitted in one concave portion 14b of the fixing member 10, the additional convex portion 25a is also converted into the additional concave portion 11b at the same time. It is mated. Therefore, the hinge mechanism A3 can more firmly fix the fixing member 10 and the rotating member 20 when the convex portion 22a and the concave portion 14b are fitted.

  A combination of the hinge mechanism A2 and the hinge mechanism A3 is also possible. In this case, the additional recess 11c is formed to be inclined.

  18 to 22 show a bench B according to the second aspect of the present invention. As shown in FIG. 18, the bench B has a seat surface member 40 and the seat surface member 40. And a pair of leg members 60 connected to the lower surface of the seat member 40 so as to be foldable and rotatable. A stay 41 extending rearward is extended from the rear edge of the seat member 40, and a backrest 50 is connected to the stay 41 via the hinge mechanism A2 according to the second embodiment. . More specifically, as shown in FIG. 20, the base portion 11 of the fixing member 10 of the hinge mechanism A2 is fixed to the upper surface of the stay 41 by using a screw 71, while the base member 11 of the hinge mechanism A2 is fixed to the rotating member 20 of the hinge mechanism A2. The bracket piece 51 extended from the lower edge part of the backrest 50 is connected using the screw 72 so as to be along the outer surface of the pair of plate-like parts 21. Accordingly, as shown in FIGS. 18 and 20, the backrest 50 is in an upright state inclined slightly rearward from the vertical direction with respect to the seat surface member 40, and with respect to the seat surface member 40 as shown in FIG. Can be selected. In the tilted upright state shown in FIGS. 18 and 20, as described above with reference to A2 of the hinge mechanism according to the second embodiment, the convex portion 22a and the additional convex portion 22b are respectively provided with one concave portion 14b and the additional concave portion. In addition to tightly fitting to 11a, the side wall of the rotating member 20 is in contact with the stopper wall 15 provided on the fixing member 10, so that the backrest 50 is strongly prevented from rotating backward. . Therefore, even if a person sitting on the seat is strongly leaned against the backrest 50, the backrest 50 is prevented from inadvertently rotating backward, and safety is improved.

  The connection of the leg member 60 to the back surface of the seat member 40 is performed as follows. As shown in FIG. 19, the fixing member 10 of the hinge mechanism A <b> 1 according to the first embodiment is fixed by connecting the base portion 11 to the back surface of the seat member 40 with a screw 71. At this time, the support shaft 13 extends in the front-rear width direction of the seat member 40. On the other hand, a bracket piece 61 provided at the upper end of the leg member 60 so as to be along the outer surfaces of the pair of plate-like portions 21 of the rotating member 20 is fixed by using screws 72. As a result, the leg member 60 stands vertically with respect to the back surface of the seat member 40 as shown in FIGS. 18 and 19, and the back surface of the seat member 40 as shown in FIGS. And a state of being folded so as to overlap with each other.

  In this hinge mechanism A1, since the concave portions 14a, 14b, and 14c provided in the fixing member 10 so as to fit the convex portion 22a of the rotating member 20 are provided at three positions every 90 degrees, the leg member 60 is folded. In this case, as shown in FIG. 17, a state of folding the seating surface member 40 in the longitudinal direction inside and a state of folding the seating surface member 40 in the longitudinal direction outside as shown in FIG. 18 can be appropriately selected. In the standing state of the leg member 60 shown in FIG. 15, the convex portion 22a and the additional convex portion 22b of the rotating member 20 are fitted in the concave portion 14b and the additional concave portion 11a provided in the fixing member 10, respectively. And since this fitting state is stably maintained by the effect | action of the tension | pulling coil spring 30, it prevents the leg member 60 from folding and turning carelessly strongly. In order to fold the leg member 60, the leg member 60 is pulled in the direction away from the seat member 40 to resist the elasticity of the coil spring 30, as can be understood from the above-described hinge mechanism A 1 according to the first embodiment. It is only necessary to release the fitting relationship between the convex portion 22a, the concave portion 14b of the additional convex portion 22b, and the additional concave portion 11a, and rotate the leg member 60 in a desired direction. When the convex portion 22a slides on the arcuate outer peripheral surface of the upright wall 12 and corresponds to the other concave portions 14a and 14c, the convex portion 22a automatically fits into the other concave portions 14a and 14c and the leg member 60 is folded. The state is stably maintained.

  The scope of the present invention is not limited to the above-described embodiment, and all modifications within the scope of the matters described in the claims are included in the scope of the present invention. The specific configuration of each part of the hinge mechanism can be freely changed. For example, the number and position of the recesses provided in the fixing member 10 can be variously changed according to the application.

  In addition, the use example of the hinge mechanism according to the present invention is not limited to the case where the backrest or the leg member is rotatably connected to the seat surface member in the bench, but the leg portion for the seat surface of the small chair, the desk The present invention can be applied to any case where a member such as a leg portion with respect to the top plate can be rotated while stably holding another member for each desired rotation angle.

It is a front view of 1st Embodiment of the hinge mechanism which concerns on the 1st side surface of this invention. It is sectional drawing which follows the II-II line of FIG. It is sectional drawing which follows the III-III line of FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. 2. It is a front view for demonstrating an effect | action of the hinge mechanism shown in FIG. It is sectional drawing for demonstrating an effect | action of the hinge mechanism of FIG. 1, and is sectional drawing equivalent to a cross section in FIG. It is sectional drawing for demonstrating an effect | action of the hinge mechanism of FIG. 1, and is sectional drawing equivalent to FIG. It is a figure for demonstrating the effect | action of the hinge mechanism of FIG. It is a figure for demonstrating the effect | action of the hinge mechanism of FIG. 1, and is sectional drawing equivalent to FIG. It is a front view of 2nd Embodiment of the hinge mechanism which concerns on the 1st side surface of this invention. It is sectional drawing which follows the XI-XI line of FIG. It is sectional drawing which follows the XII-XII line | wire of FIG. It is sectional drawing which follows the XIII-XIII line | wire of FIG. It is a front view of 3rd Embodiment of the hinge mechanism concerning the 1st side surface of this invention. It is a side view of the hinge mechanism shown in FIG. It is sectional drawing which follows the XVI-XVI line of FIG. It is sectional drawing which follows the XVII-XVII line of FIG. It is a whole perspective view of an example of the bench concerning the 2nd side of the present invention. It is a principal part side view which shows the folding structure of the seat surface member and leg member in the bench of FIG. It is a principal part front view which shows the connection structure of the backrest with respect to the seat surface member in the bench of FIG. FIG. 19 is a perspective view showing the bench shown in FIG. 18 from the back surface side in a state where the backrest is folded with respect to the upper surface of the seat member and the leg member is folded with respect to the back surface of the seat member. It is a perspective view which shows the state by which the leg member was folded in the opposite direction to the state shown in FIG. It is a side view explaining a prior art example. It is sectional drawing for demonstrating the effect | action of a prior art example. It is sectional drawing for demonstrating the effect | action of a prior art example.

Explanation of symbols

A1, A2, A3 Hinge mechanism B Bench 10 Fixing member 11 Base part 11a, 11b Additional recessed part 12 Standing wall 13 Support shaft 14a, 14b, 14c Recessed part 15 Stopper wall 20 Rotating member 21 Plate-like part 21a End part 22 Connecting part 22a convex part 22b additional convex part 23 long hole 24 through hole 24a outlet part 25 intermediate part 25a additional convex part 30 tension coil spring (elastic member)
31 Pin 40 Seat member 41 Stay 50 Backrest 51, 61 Bracket piece 60 Leg member 71, 72 Screw

Claims (8)

The fixed member, the support shaft provided on the fixed member, and the support shaft can be rotated with respect to the support shaft as a fulcrum, and can be moved relative to each other in the radial direction of the support shaft. A rotating member, and an elastic member that constantly applies a tensile force between the support shaft and the rotating member,
While the rotating member includes a convex portion protruding in a direction in which a tensile force by the elastic member acts,
The hinge mechanism according to claim 1, wherein the fixing member includes a plurality of concave portions into which the convex portions can be fitted. The fixing member includes a base portion and a pair of upstanding walls that stand at a predetermined interval from the base portion.
The rotating member includes a pair of plate-like portions located outside the standing walls so as to sandwich the pair of standing walls, a connecting portion that connects one end portions of the pair of plate-like portions, and the pair of A long hole formed in each of the plate-like portions, and the long hole engages with both end portions of the support shaft so as to be rotatable and slidable in the long axis direction of the long hole. And
The elastic member is constituted by a tension coil spring disposed between the connecting portion of the rotating member and the support shaft and extending in the long axis direction of the elongated hole,
The convex portion is formed on the inner surface of the connecting portion of the rotating member,
2. The hinge mechanism according to claim 1, wherein the plurality of recesses are respectively formed on peripheral surfaces of the pair of standing walls of the fixing member.   3. The hinge mechanism according to claim 2, wherein a portion connecting the plurality of recesses on a peripheral surface of the pair of standing walls of the fixing member has an arc shape with a constant radius centered on the support shaft.   An additional convex portion is formed on the other end of the pair of plate-like portions of the rotating member, while the additional convex portion can be fitted to the base portion of the fixing member. The hinge mechanism according to claim 2, wherein a concave portion is formed.   The hinge mechanism according to any one of claims 2 to 4, wherein the plurality of recesses are formed at three positions every 90 degrees about the support shaft.   6. The hinge mechanism according to claim 5, wherein among the three concave portions, a second concave portion is formed on a straight line passing through the support shaft with respect to the base portion and orthogonal to the bottom surface of the base portion.   The hinge mechanism according to claim 6, wherein the additional convex portion and the additional concave portion are formed so as to be fitted to each other when the convex portion is fitted to the second concave portion.   A bench including a seat member and a leg member, wherein the fixing member in the hinge mechanism according to any one of claims 1 to 7 is connected to a back surface of the seat member, and the rotating member is the leg. A bench characterized by being connected to a base end of a member.

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