Rotating mechanism with locking function

Abstract

A rotating mechanism with a locking function that can position a rotating member without play is realized with a simple and easy-to-operate structure. 【Solution means】 In a rotating mechanism with a locking function including a fixed member 10, a rotating member 20, a support shaft 30, a regulating pin 40, and a biasing member 50, the support shaft 30 is fixed to one of the fixed member 10 and the rotating member 20, and the regulating pin 40 is fixed to the other member. A pair of left and right regulating pin passages β and regulating pin locking recesses γ are provided in the one member respectively, and a pair of left and right support shaft insertion holes α are provided in the other member in a long hole shape. Either the regulating pin locking recess γ or the support shaft insertion hole α is formed to be narrower in width toward the inner part, and the rotating member 20 is biased in the locking direction by the biasing member 50.

Description

Technical Field

[0001] The present invention relates to a rotating mechanism with a locking function that can lock a rotating member at a predetermined rotation position while rotating the rotating member with respect to a fixed member.

Background Art

[0002] As a rotating mechanism with a locking function, as shown in FIG. 3 of Patent Document 1, by locking the locking portion 31 to any one of the plurality of locking portions 31a, the rotating member 40 can be position-adjusted in multiple stages with respect to the fixed member 30 (a rotating mechanism with a latch-type locking function) is known. However, the rotating mechanism with a latch-type locking function has a problem that play is likely to occur in the positioned rotating member. In addition, there is also a problem that the number of parts is large, the structure becomes complicated, and the manufacturing cost becomes high.

[0003] Further, as a rotating mechanism with a locking function, as shown in FIG. 2 of Patent Document 2, by meshing the face gears 11 and 12, the head receiving side member 40 (rotating member) can be position-adjusted in multiple stages with respect to the stay side member 10 (fixed member) (a rotating mechanism with a face gear-type locking function) is also known. However, the rotating mechanism with a face gear-type locking function has a problem that the meshing between the face gears is shallow and the locking force for locking the rotating member at a predetermined position tends to be insufficient. In addition, since the face gear has a complicated shape, there is also a problem that the manufacturing cost becomes high.

[0004] Furthermore, as shown in FIG. 7 of Patent Document 3, a rotation mechanism with a locking function that includes a fixed bracket 4 (fixed member), a movable bracket 3 (rotating member), a locking shaft 12 (restricting pin), and a locking shaft support shaft 11 is also known. In this rotation mechanism with a locking function, when the movable bracket 3 is rotated to a predetermined rotation position, the side surface 21 of the long hole 13 formed in the movable bracket 3 and the side surface 22 of the fixed bracket 4 form a wedge groove (a groove that narrows toward the back), and the locking shaft 12 engages with the groove like a wedge. Therefore, the movable bracket 3 can be positioned with respect to the fixed bracket 4 without play.

[0005] However, in the rotation mechanism with a locking function of Patent Document 3, the movable bracket 3 can be positioned without play only at one rotation position (only the use position shown in FIG. 4 of the same document). Also, in the rotation mechanism with a locking function of the same document, in order to release the lock of the movable bracket 3 (remove the locking shaft 12 engaged in the wedge groove), it is necessary to operate a lock release lever 30 (FIG. 1 of the same document), which is troublesome. There is also a problem that the structure becomes complicated, such as the need to incorporate the lock release lever 30 and the like.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] The present invention is made to solve the above problems, and realizes a rotation mechanism with a locking function that can position a rotating member without play in a simple and easy-to-operate structure. Another object of the present invention is to provide a rotation mechanism with a locking function that can increase the locking force of the rotating member.

Means for Solving the Problems

[0008] The above problems are a fixed member, a rotating member, a support shaft for supporting the rotating member in a rotatable state with respect to the fixed member, a regulating pin for restricting the rotation of the rotating member, a biasing member and a rotation mechanism with a locking function provided with Among the fixed member and the rotating member, the support shaft is fixed to either one of the members, the regulating pin is fixed to the other member, In the one member, a regulating pin passage for moving the regulating pin when the rotating member rotates, regulating pin locking recesses formed inward or outward in the radial direction of rotation from both ends of the regulating pin passage are provided in a pair on the left and right respectively, In the other member, a pair of support shaft insertion holes for inserting the support shaft are provided in a long hole shape on the left and right, Either the regulating pin locking recess or the support shaft insertion hole is formed to be narrower toward the inner part, the rotating member is biased by the biasing member in the locking direction (the direction in which the regulating pin locks in the regulating pin locking recess in the radial direction of rotation, or the direction in which the support shaft locks in the support shaft insertion hole) A rotation mechanism with a locking function, characterized in that is solved by providing.

[0009] In the rotation mechanism with a locking function of the present invention, as the rotating member is rotated and the regulating pin that moves in the regulating pin passage overlaps with the regulating pin locking recess, the rotating member moves in the radial direction of the rotation radius by the biasing force of the biasing member, and the regulating pin is locked in the narrow portion of the width of the regulating pin locking recess, or the support shaft is locked in the narrow portion of the width of the support shaft insertion hole. Thereby, the rotating member can be locked at its rotation position. The force for locking the rotating member can be increased by increasing the distance from the support shaft to the regulating pin, increasing the biasing force of the biasing member, or the like. Since this narrow portion is formed narrower toward the inner part, the regulating pin is in a state of being wedged into the regulating pin locking recess, or the support shaft is in a state of being wedged into the support shaft insertion hole. Therefore, the rotating member can be positioned (locked) without play at its rotation position.

[0010] The locking of the rotating member can be released by moving the rotating member and the members attached thereto (the headrest's head support portion, the table top, the ottoman's footrest portion) in the unlocking direction (the direction in which the regulating pin disengages from the regulating pin locking recess). Therefore, the locking of the rotating member can be released without operating the unlocking operation means such as a lever. Further, since there is no need to provide the unlocking operation means, the structure of the rotation mechanism with a locking function can be simplified.

[0011] In addition, in the rotation mechanism with a locking function of the present invention, since each of the support shaft insertion hole, the regulation pin passage, and the regulation pin locking recess is provided in a pair on two surfaces (planar portions spaced apart in the left-right direction), the rotating member can be supported well in balance at two or more positions with respect to the fixed member. For this reason, it is possible to make it difficult to twist the rotating member and the fixed member. Further, the load applied to the rotating member can be dispersed. At this time, if two or more regulation pins are provided on the other member (the member to which the regulation pin is fixed), and the regulation pin passage and the regulation pin locking recess are provided in two or more stages on the regulation pin locking member, the rotating member can be locked to the fixed member at four or more positions in total. Thereby, the load applied to the rotating member can be further dispersed. For this reason, it is also possible to make the material (such as a steel plate) forming the rotating member and the fixed member thinner. Therefore, it is possible to reduce the weight of the rotation mechanism with a locking function.

[0012] In the rotation mechanism with a locking function of the present invention, it is also preferable that one of the inner wall surfaces of the pair of inner wall surfaces in the regulation pin locking recess is inclined at an angle (for example, 20 to 40°) that slips at a set load. Thereby, when a load equal to or greater than a predetermined value is applied to the rotating member, the regulation pin can be disengaged from the regulation pin locking recess, so that the rotating member can be slipped with respect to the fixed member. This configuration can be suitably adopted when the rotation mechanism with a locking function of the present invention is incorporated into a headrest, an ottoman, or the like.

[0013] The rotation mechanism with a locking function of the present invention can be incorporated into various products that need to be able to lock the rotating member at a predetermined rotation position while rotating the rotating member with respect to the fixed member. For example, by incorporating the rotation mechanism with a locking function of the present invention into a headrest, the front-rear position of the headrest portion in the headrest can be locked at the set position. Further, by incorporating the rotation mechanism with a locking function of the present invention into a table, the tabletop of the table can be locked at the storage position or the use position (set position). Furthermore, by incorporating the rotation mechanism with a locking function of the present invention into an ottoman, the up-down position of the footrest portion in the ottoman can be locked at the set position. These headrests, tables, ottomans, etc. are suitable for being provided on the seats of moving bodies such as vehicles and airplanes.

Effects of the Invention

[0014] As described above, according to the present invention, it becomes possible to realize a rotation mechanism with a locking function that can position the rotating member without rattling with a simple and easy-to-operate structure. In addition, it also becomes possible to provide a rotation mechanism with a locking function that can increase the locking force of the rotating member.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0016] Embodiments of the rotating mechanism with a locking function of the present invention will be described with reference to the drawings. Hereinafter, seven embodiments from the first embodiment to the seventh embodiment will be taken as examples to describe the rotating mechanism with a locking function of the present invention. However, they are merely preferred embodiments, and the technical scope of the rotating mechanism with a locking function of the present invention is not limited to those embodiments. Appropriate modifications can be made to the rotating mechanism with a locking function of the present invention within a range that does not impair the gist of the invention.

[0017] 1. Rotating Mechanism with Locking Function of the First Embodiment First, the rotating mechanism with a locking function of the first embodiment will be described. FIGS. 1 and 2 show the rotating mechanism with a locking function 1 of the first embodiment. FIG. 1(a) shows the rotating mechanism with a locking function 1 as viewed from the front, and FIG. 1(b) shows the rotating mechanism with a locking function 1 as viewed from the side. Further, FIG. 2 shows the relationship between the support shaft 30 and the support shaft insertion hole α, and the regulating pin 40 and the regulating pin passage β in the rotating mechanism with a locking function 1.

[0018] As shown in Fig. 1, the rotation mechanism 1 with a locking function according to the first embodiment includes a fixed member 10, a rotating member 20, a support shaft 30, a regulating pin 40, and a biasing member 50. The fixed member 10 is fixed in a non-movable state to an object, and the rotating member 20 is pivotally supported by the support shaft 30 in a rotatable state with respect to the fixed member 10. An object to be rotatably attached to the object (such as the top plate of a table, the footrest of an ottoman, or the headrest of a headrest) is fixed to the rotating member 20. The regulating pin 40 is for regulating (locking) the rotation of the rotating member 20. The biasing member 50 biases the rotating member 20 in the locking direction. In the rotation mechanism 1 with a locking function according to the first embodiment, the biasing member 50 is a coil spring (tension spring) extended from its natural length, with one end attached to the support shaft 30 and the other end attached to the regulating pin 40.

[0019] In the rotation mechanism 1 with a locking function according to the first embodiment, the fixed member 10 fixes the regulating pin 40 and is provided with a pair of left and right support shaft insertion holes α. This support shaft insertion hole α is a portion for inserting the support shaft 30 and is formed in an elongated hole shape. On the other hand, the rotating member 20 fixes the support shaft 30 and is provided with a pair of left and right regulating pin passages β and regulating pin locking recesses γ, respectively. This regulating pin passage β is a portion for moving the regulating pin 40 when the rotating member 20 rotates. In the rotation mechanism 1 with a locking function according to the first embodiment, the regulating pin passage β is provided in an arc shape centered on the support shaft 30. The regulating pin locking recess γ is a portion for locking the regulating pin 40 when the rotating member 20 reaches a predetermined rotation position and locking the rotating member 20 at that rotation position. The regulating pin locking recess γ is formed to be narrower towards the inner part thereof.

[0020] The regulation pin locking recess γ may be provided at at least one location in the regulation pin passage β. However, in the rotation mechanism 1 with a locking function according to the first embodiment, as shown in FIG. 2, the regulation pin locking recess γ is provided at three locations (both ends and the middle of the regulation pin passage β) in each of the pair of left and right regulation pin passages β. Thereby, the rotation of the rotating member 20 can be locked at three locations. For example, when the regulation pin 40 is locked in the regulation pin locking recess γ at the position P A in FIG. 2, the rotating member 20 is in the undeployed position (storage position), and when the regulation pin 40 is locked in the regulation pin locking recess γ at the position P B in FIG. 2, the rotating member 20 is in the mid-deployment position, and when the regulation pin 40 is locked in the regulation pin locking recess γ at the position P C in FIG. 2, the rotating member 20 can be made to be in the final deployed position (use position).

[0021] The direction in which the regulation pin locking recess γ is provided from the regulation pin passage β (either inward or outward in the radial direction of the rotation of the rotating member 20) is determined by the biasing direction of the biasing member 50. As already described, in the rotation mechanism 1 with a locking function according to the first embodiment, a tension spring is adopted as the biasing member 50, and the regulation pin locking recess γ is provided inward (toward the support shaft 30 side) in the radial direction of the rotation of the rotating member 20.

[0022] When the rotating member 20 is rotated and the regulating pin 40 overlaps with any one of the regulating pin locking recesses γ, the rotating member 20 moves inward in the radial direction of the rotation radius by the biasing force of the biasing member 50 (tension spring) (the movement of the rotating member 20 in the radial direction of the rotation radius is allowed by the length of the support shaft insertion hole α being elongated). The regulating pin 40 is locked in the regulating pin locking recess γ. As already described, since the regulating pin locking recess γ is formed to be narrower toward the inner part, the regulating pin 40 at that time is in a state of biting into the regulating pin locking recess γ like a wedge. Therefore, the rotating member 20 can be firmly locked at its rotating position without rattling. The force (locking force) for locking the rotating member 20 can be increased by increasing the distance L (Fig. 2) from the support shaft 30 to the regulating pin 40 or increasing the biasing force of the biasing member 50, etc.

[0023] The locking can be released by moving the rotating member 20 and the members attached thereto (such as the headrest's head receiving part, the table top, the ottoman's footrest part, etc.) in the unlocking direction (the direction in which the regulating pin disengages from the regulating pin locking recess) against the biasing force of the biasing member 50. Therefore, the locking of the rotating member 20 can be released without operating an unlocking operation means such as a lever. Also, since there is no need to provide an unlocking operation means, the structure of the rotating mechanism 1 with a locking function can be simplified.

[0024] Incidentally, in the rotation mechanism 1 with a locking function according to the first embodiment, as shown in FIG. 1(a), the rotating member 20 is formed in a cross-sectional groove shape having a pair of left and right side wall portions 21, and the fixing member 10 is also formed in a cross-sectional groove shape having a pair of left and right side wall portions 11. The rotating member 20 is disposed inside (within the groove) of the fixing member 10. The above-mentioned regulation pin passage β and the regulation pin locking recess γ are provided symmetrically with respect to each of the pair of left and right side wall portions 21 of the rotating member 20. Further, the support shaft insertion hole α is provided symmetrically with respect to each of the pair of left and right side wall portions 11 of the fixing member 10. Thereby, the rotating member 20 can be supported well-balanced at two locations on the left and right with respect to the fixing member 10, and the rotating member and the fixing member can be made difficult to twist. In addition, the load applied to the rotating member 20 can be dispersed to the left and right, and the material (such as a steel plate) forming the rotating member and the fixing member can be thinned. Therefore, it becomes possible to reduce the weight of the rotation mechanism 1 with a locking function.

[0025] Also, in the rotation mechanism 1 with a locking function according to the first embodiment, when the regulation pin 40 is locked in the regulation pin locking recess γ at the final deployment position P C (FIG. 2), when a load equal to or greater than a specified value (set load) is applied to the rotating member 20, the regulation pin 40 is disengaged from the regulation pin locking recess γ and slips. Specifically, one of the pair of inner wall surfaces of the regulation pin locking recess γ is inclined at an angle θ. Thereby, it becomes possible to improve the performance of a device (such as a headrest or an ottoman) using the rotation mechanism 1 with a locking function. The specific value of the angle θ is not particularly limited, but is usually in the range of 20 to 40°.

[0026] 2. Rotation mechanism with locking function according to the second embodiment Subsequently, the rotation mechanism with a locking function according to the second embodiment will be described. Regarding the rotation mechanism with a locking function according to the second embodiment, mainly, the description will be focused on the configuration different from that of the rotation mechanism 1 with a locking function according to the first embodiment (FIGS. 1 and 2). For the configuration not particularly mentioned in the rotation mechanism with a locking function according to the second embodiment, the same configuration as that described in the rotation mechanism 1 with a locking function according to the first embodiment can be adopted.

[0027] Figure 3 is a side view of the rotating member 20 in the rotating mechanism 1 with a locking function according to the second embodiment in a locked state at each position. Fig. 3(a) shows the state where the rotating member 20 is in the undeployed position (storage position), Fig. 3(b) shows the state where the rotating member 20 is in the intermediate deployment position, and Fig. 3(c) shows the state where the rotating member 20 is in the final deployment position.

[0028] As already described, in the rotating mechanism 1 with a locking function according to the first embodiment (Figs. 1 and 2), the restricting pin 40 is fixed to the fixed member 10 and the support shaft insertion hole α is provided, and the support shaft 30 is fixed to the rotating member 20 and the restricting pin passage β and the restricting pin locking recess γ are provided. On the other hand, in the rotating mechanism with a locking function according to the second embodiment, as shown in Fig. 3, the support shaft 30 is fixed to the fixed member 10 and the restricting pin passage β and the restricting pin locking recess γ are provided, and the restricting pin 40 is fixed to the rotating member 20 and the support shaft insertion hole α is provided.

[0029] Thus, in the rotating mechanism 1 with a locking function according to the second embodiment, compared with the rotating mechanism 1 with a locking function according to the first embodiment, the member (support shaft fixing member) for fixing the support shaft 30 and the member (support shaft insertion member) for providing the support shaft insertion hole α are reversed, and the member (restricting pin fixing member) for fixing the restricting pin 40 and the member (restricting pin locking member) for providing the restricting pin locking recess γ are also reversed. However, even if these are reversed, the same operation as that of the rotating mechanism 1 with a locking function according to the first embodiment can be realized. However, in the rotating mechanism 1 with a locking function according to the second embodiment, the restricting pin locking recess γ is provided only at both ends of the restricting pin passage β, and the restricting pin locking recess γ is not provided in the middle of the restricting pin passage β. For this reason, in the rotating mechanism 1 with a locking function according to the second embodiment, the rotating member 20 can be locked only at two positions, namely, the undeployed position (storage position) and the final deployment position.

[0030] 3. Rotating mechanism with locking function according to the third embodiment Next, the rotation mechanism with a lock function according to the third embodiment will be described. Regarding the rotation mechanism with a lock function according to the third embodiment as well, the description will mainly focus on the configuration that is different from the rotation mechanism 1 with a lock function according to the first embodiment (Figs. 1 and 2). For the configuration not particularly mentioned in the rotation mechanism with a lock function according to the third embodiment, the same configuration as that described in the rotation mechanism 1 with a lock function according to the first embodiment or the second embodiment can be adopted.

[0031] Fig. 4 is a diagram showing the rotation mechanism 1 with a lock function according to the third embodiment. Fig. 4(a) shows the state of the rotation mechanism 1 with a lock function viewed from the front, and Fig. 4(b) shows the state of the rotation mechanism 1 with a lock function viewed from the side.

[0032] In the rotation mechanism 1 with a lock function according to the third embodiment shown in Fig. 4, although the correspondence relationships among the support shaft fixing member, the support shaft insertion member, the restriction pin fixing member, the restriction pin locking member, the fixing member 10, and the rotating member 20 are the same as those in the rotation mechanism 1 with a lock function according to the first embodiment (Figs. 1 and 2), the inside and outside of the fixing member 10 and the rotating member 20 are opposite to those in the rotation mechanism 1 with a lock function according to the first embodiment.

[0033] That is, in the rotation mechanism 1 with a lock function according to the first embodiment, as shown in Fig. 1(a), the lateral width (left - right width) of the fixing member 10 is wider than the lateral width (left - right width) of the rotating member 20, and the rotating member 20 is arranged inside the fixing member 10 (inside the groove). In contrast, in the rotation mechanism 1 with a lock function according to the third embodiment, as shown in Fig. 4(a), the lateral width (left - right width) of the fixing member 10 is narrower than the lateral width (left - right width) of the rotating member 20, and the fixing member 10 is arranged inside the rotating member 20 (inside the groove).

[0034] Accordingly, the biasing members 50 are provided in pairs on the left and right sides of the fixing member 10. Each biasing member 50 is a tension spring, one end (lower end) of which is connected to the support shaft 30, and the other end (upper end) of which is connected to the flange portion at the upper part of the fixing member 10. For this reason, the biasing direction of the rotating member 20 by the biasing member 50 is opposite to that of the rotating mechanism 1 with a locking function in the first embodiment. Therefore, in the rotating mechanism 1 with a locking function in the first embodiment, the restriction pin locking recess γ provided inward in the radial direction of the rotation radius is provided outward in the radial direction of the rotation radius in the rotating mechanism 1 with a locking function in the third embodiment, as shown in FIG. 4(b).

[0035] Also, in the rotating mechanism 1 with a locking function in the first embodiment, as shown in FIG. 1(b), the restriction pin passage β was provided in an arc shape and a groove shape (slit shape), whereas in the rotating mechanism 1 with a locking function in the third embodiment, as shown in FIG. 4(b), the restriction pin passage β is provided over a wide range. Even so, a desired operation can be performed on the rotating member 20. This is because the support shaft 30 is restricted by the support shaft insertion hole α and cannot move upward any further. The restriction pin passage β does not need to be formed in a groove shape (slit shape) capable of guiding the restriction pin 40.

[0036] Furthermore, in the rotating mechanism 1 with a locking function in the first embodiment, as shown in FIG. 2, the restriction pin 40 was engaged with the restriction pin locking recess γ itself like a wedge. On the other hand, in the rotating mechanism 1 with a locking function in the third embodiment, as shown in FIG. 4(b), although the restriction pin locking recess γ at the storage position is formed in a wedge shape (narrower in width toward the inner part), each restriction pin locking recess γ has a dimension with a margin with respect to the restriction pin 40. However, when the stopper 22 provided on the rotating member 20 abuts against the stopper receiving portion 12 of the fixing member 10, the rotating member 20 is sandwiched between the stopper receiving portion 12 and the restriction pin 40, and the entire rotating member 20 is in a state of being engaged like a wedge.

[0037] Note that, as shown in FIG. 9, the regulation pin locking recess γ may be formed straight (with a constant width), and the support shaft insertion hole α may be formed with a narrower width toward the inner part. Thereby, the support shaft 30 can be engaged with the support shaft insertion hole α like a wedge. However, in this case, no matter at which position the rotating member 20 is locked, since the support shaft 30 engages with the same location of the support shaft insertion hole α, there is a problem that wear is likely to occur around the support shaft insertion hole α and on the support shaft 30.

[0038] 4. Rotating mechanism with locking function of the fourth embodiment Subsequently, the rotating mechanism with locking function of the fourth embodiment will be described. For the configurations not particularly mentioned in the rotating mechanism with locking function of the fourth embodiment, the same configurations as those described in the rotating mechanism with locking function 1 of the first embodiment, the second embodiment, or the third embodiment can be adopted.

[0039] FIG. 5 is a view showing the rotating mechanism with locking function 1 of the fourth embodiment. FIG. 5(a) shows the state of the rotating mechanism with locking function 1 viewed from the front, and FIG. 5(b) shows the state of the rotating mechanism with locking function 1 viewed from the side.

[0040] In the rotation mechanism 1 with a locking function according to the fourth embodiment shown in FIG. 5, the correspondence relationships between the support shaft fixing member, the support shaft insertion member, the restriction pin fixing member, the restriction pin locking member, the fixing member 10, and the rotating member 20 are the same as those in the rotation mechanism 1 with a locking function according to the first embodiment (FIGS. 1 and 2) and the rotation mechanism 1 with a locking function according to the third embodiment (FIG. 4). However, in the rotation mechanism 1 with a locking function according to the first embodiment, as shown in FIG. 1(a), the lateral width (left - right width) of the fixing member 10 is wider than the lateral width (left - right width) of the rotating member 20, and the rotating member 20 is arranged inside the fixing member 10 (inside the groove). On the contrary, in the rotation mechanism with a locking function according to the fourth embodiment, as shown in FIG. 5(a), at the upper part of the rotation mechanism 1 with a locking function, the lateral width (left - right width) of the fixing member 10 is wider than the lateral width (left - right width) of the rotating member 20, and the rotating member 20 is arranged inside the fixing member 10 (inside the groove). However, at the lower part of the rotation mechanism 1 with a locking function, the lateral width (left - right width) of the fixing member 10 is narrower than the lateral width (left - right width) of the rotating member 20, and the fixing member 10 is arranged inside the rotating member 20 (inside the groove). Thus, even if the inside and outside of the fixing member 10 and the rotating member 20 are switched depending on the location, the same operation can be realized.

[0041] Also, in the rotation mechanism 1 with a locking function according to the first embodiment, as shown in FIG. 1, only one restriction pin 40 was provided, while in the rotation mechanism 1 with a locking function according to the fourth embodiment, as shown in FIG. 5, two restriction pins 40 are provided. The respective restriction pins 40 are integrally connected. Accordingly, the restriction pin passages β, etc. are provided in two stages. That is, in addition to the restriction pin passage β formed by an arc - shaped slit, the lower edge of the rotating member 20 also functions as the restriction pin passage β. Of the two restriction pins 40, one (upper) restriction pin 40 moves in one (upper) restriction pin passage β, and the other (lower) restriction pin 40 moves in the other (lower) restriction pin passage β. Thereby, it becomes possible to lock (fasten) the rotating member 20 to the fixing member 10 at a total of four locations, namely, a pair on the left and right and in two stages up and down.

[0042] 5. Rotating Mechanism with Locking Function of the Fifth Embodiment Subsequently, the rotating mechanism with a locking function of the fifth embodiment will be described. For components not specifically mentioned in the rotating mechanism with a locking function of the fifth embodiment, the same configurations as those described in the rotating mechanism with a locking function 1 of other embodiments can be adopted.

[0043] FIG. 6 is a diagram showing the rotating mechanism 1 with a locking function of the fifth embodiment. As shown in FIG. 6, the rotating mechanism 1 with a locking function of the fifth embodiment is incorporated in a headrest installed on a seat of a vehicle. In the rotating mechanism 1 with a locking function, the fixed member 10 is fixed in a non-movable state with respect to the headrest stay, and the rotating member 20 is fixed in a non-movable state with respect to the headrest portion 103. The headrest stay is attached to the seat backrest in a state where it can be raised and lowered (height adjustable). Thereby, it becomes possible to lock the front-rear position of the headrest portion 103 at a set position. Specifically, from the state shown in FIG. 6(a), when the headrest portion 103 is grasped and operated in the unlocking direction (the direction in which the regulating pin 40 comes out of the regulating pin locking recess γ), and the headrest portion 103 is rotated forward, as shown in FIG. 6(b), the headrest portion 103 moves forward. From the state shown in FIG. 6(b), when the headrest portion 103 is rotated backward, the headrest portion 103 moves backward. Thereby, it becomes possible to lock the headrest portion 103 at an appropriate set position according to the physique of the user, the reclining angle of the backrest, etc., and use the headrest.

[0044] Incidentally, in the rotation mechanism 1 with a locking function according to the fifth embodiment, two regulation pin locking recesses γ are provided. Each regulation pin locking recess γ is arranged on the opposite side when viewed from the support shaft 30 (one on the upper side of the support shaft 30 and the other on the lower side of the support shaft 30). Accordingly, the regulation pins 40 are also provided at two locations. Thereby, even if the fixing member 10 and the rotating member 20 are thinned in the front-rear direction, a wide rotation range of the rotating member 20 can be ensured. In the example shown in FIG. 6, the lower regulation pin 40 is fixed to the fixing member 10, and the lower regulation pin locking recess γ is provided in the rotating member 20. This point is the same as that of the rotation mechanism 1 with a locking function according to the first embodiment. However, the upper regulation pin 40 is fixed to the same rotating member 20 as the support shaft 30, and the upper regulation pin locking recess γ is arranged in the same fixing member 10 as the support shaft insertion hole α. Although examples are also given in "8. Others" described later, even if the support shaft 30 and the regulation pin 40 are fixed to the same member, and the support shaft insertion hole α, the regulation pin passage β, and the regulation pin locking recess γ are arranged in the other same member, the desired operation can be realized.

[0045] 6. Rotation mechanism with locking function according to the sixth embodiment Next, the rotation mechanism 1 with a locking function according to the sixth embodiment will be described. For the configuration not particularly mentioned in the rotation mechanism 1 with a locking function according to the sixth embodiment, the same configuration as that described in the rotation mechanism 1 with a locking function according to other embodiments can be adopted.

[0046] FIG. 7 is a view showing the rotation mechanism 1 with a locking function according to the sixth embodiment. As shown in FIG. 7, the rotation mechanism 1 with a locking function according to the sixth embodiment is incorporated in a table installed on a seat of a vehicle. The fixing member 10 is fixed in a non-movable state with respect to the seat frame of the backrest, and the fixing member 20 is fixed in a non-movable state with respect to the top plate 101 of the table. Thereby, it becomes possible to lock the position of the top plate 101 at the storage position (the position indicated by the virtual line) or the use position (the position indicated by the solid line). Therefore, when the table is in use, the top plate 101 can be firmly supported, and when the table is not in use, the generation of abnormal noise due to rattling during traveling can be suppressed.

[0047] 7. Rotating Mechanism with Locking Function of the Seventh Embodiment Subsequently, the rotating mechanism with a locking function of the seventh embodiment will be described. For configurations not particularly mentioned in the rotating mechanism with a locking function of the seventh embodiment, the same configurations as those described in the rotating mechanism with a locking function 1 of other embodiments can be adopted.

[0048] FIG. 8 is a diagram showing the rotating mechanism 1 with a locking function of the seventh embodiment. As shown in FIG. 8, the rotating mechanism 1 with a locking function of the seventh embodiment is incorporated in an ottoman installed on a vehicle seat. The fixed member 10 is fixed in a non-movable state with respect to the seat frame of the seat surface, and the rotating member 20 is fixed in a non-movable state with respect to the footrest portion 102. Thereby, it becomes possible to lock the position of the footrest portion 102 at the storage position (the position indicated by the virtual line) or the use position (the position indicated by the solid line). Therefore, when using the ottoman, the feet can be firmly supported by the footrest portion 102, and when the ottoman is not in use, the generation of abnormal noise due to rattling during driving can be suppressed.

[0049] 8. Others FIG. 10 is a diagram for explaining variations in the arrangement of each part. FIG. 10(a) shows a case where both the support shaft 30 and the regulating pin 40 are fixed to the fixed-side member 10, and the support shaft insertion hole α, the regulating pin passage β, and the regulating pin locking recess γ are provided in the rotating member 20. FIG. 10(b) shows a case where both the support shaft 30 and the regulating pin 40 are fixed to the rotating member 20, and the support shaft insertion hole α, the regulating pin passage β, and the regulating pin locking recess γ are provided in the fixed member 10. Thus, even if the support shaft 30 and the regulating pin 40 are provided on the same member, and the support shaft insertion hole α, the regulating pin passage β, and the regulating pin locking recess γ are provided on the same member, a desired operation can be realized. The configuration of FIG. 10(a) can be adopted when the adjustment angle range of the rotating member 20 is 40° or less. Even when the adjustment angle range of the rotating member 20 is wide (for example, when it is 120° or more), if the support shaft insertion hole α is not in a simple long-hole shape (a straight long-hole shape) but in a deformed long-hole shape (a bent long-hole shape) as shown in FIG. 10(b), even if the support shaft 30 and the regulating pin 40 are provided on the same member, and the support shaft insertion hole α, the regulating pin passage β, and the regulating pin locking recess γ are provided on the same member, a desired operation can be realized.

Explanation of Reference Numerals

[0050] 1 Rotating mechanism with locking function 10 Fixed member 11 Side wall portion 12 Stopper receiving portion 20 Rotating member 21 Side wall portion 22 Stopper 30 Support shaft 40 Regulating pin 50 Biasing member 101 Top plate 102 Head receiving portion 103 Footrest portion α Support shaft insertion hole β Regulating pin passage γ Regulating pin locking recess

Claims

1. A fixed member, a rotating member, a support shaft for supporting the rotating member in a rotatable state with respect to the fixed member, a regulating pin for regulating the rotation of the rotating member, a biasing member A rotating mechanism with a locking function, comprising: Among the fixed member and the rotating member, The support shaft is fixed to one of the members, The regulating pin is fixed to the other member, In the said one member, A regulating pin passage for moving the regulating pin when the rotating member rotates, Regulating pin locking recesses formed inwardly or outwardly in the radial direction of rotation from both ends of the regulating pin passage Are provided in a pair on the left and right, respectively, In the said other member, a pair of support shaft insertion holes for inserting the support shaft are provided in a long hole shape, Either the regulating pin locking recess or the support shaft insertion hole is formed to be narrower toward the inner part, The rotating member is biased by the biasing member in the direction in which the regulating pin is locked in the regulating pin locking recess or the support shaft is locked in the support shaft insertion hole in the radial direction of rotation, and One of the inner wall surfaces of the pair of inner wall surfaces in the regulating pin locking recess is inclined at an angle at which it slips with a set load A rotating mechanism with a locking function, characterized in that.

2. A fixed member, a rotating member, a support shaft for supporting the rotating member in a rotatable state with respect to the fixed member, a regulating pin for regulating the rotation of the rotating member, a biasing member A rotating mechanism with a locking function, comprising: Among the fixed member and the rotating member, The support shaft is fixed to one of the members, The regulating pin is fixed to the other member, In the said one member, A regulating pin passage for moving the regulating pin when the rotating member rotates, Regulating pin locking recesses formed inwardly or outwardly in the radial direction of rotation from both ends of the regulating pin passage Are provided in a pair on the left and right, respectively, In the said other member, a pair of support shaft insertion holes for inserting the support shaft are provided in a long hole shape, Either the regulating pin locking recess or the support shaft insertion hole is formed to be narrower toward the inner part, The rotating member is biased by the biasing member in the direction in which the regulating pin is locked in the regulating pin locking recess or the support shaft is locked in the support shaft insertion hole in the radial direction of rotation, and Two or more regulating pins are provided on the regulating pin fixing member, On the regulating pin locking member, the regulating pin passage and the regulating pin locking recess are provided in two or more stages, The rotating member is locked to the fixed member at four or more locations in total A rotating mechanism with a locking function, characterized in that.

3. A headrest in which the front-rear position of the headrest portion can be adjusted by using the rotating mechanism with a locking function according to claim 1 or 2.

4. A table in which the vertical position of the tabletop can be adjusted by using the rotating mechanism with a locking function according to claim 1 or 2.

5. An ottoman in which the vertical position of the footrest portion can be adjusted by using the rotating mechanism with a locking function according to claim 1 or 2.

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