JP4607672B2 - Joint fittings and seat chairs - Google Patents

Description

  The present invention relates to a joint bracket and a seat chair provided at, for example, a connection portion between a seat frame and a back frame of a seat chair.

  In conventional seat chairs, joint brackets such as ratchet brackets are interposed at the connection points between the seat body and the backrest, and the tilt angle of the backrest relative to the seat body can be adjusted step by step with the joint brackets. It is well known.

As such a joint fitting for a seat chair, there is one disclosed in Patent Document 1. This joint metal fitting includes a fixing metal fitting attached to a fixing member such as a seat body and a rotation metal fitting attached to a rotation member such as a backrest, and the ratchet of the rotation metal fitting is pivotally attached to the housing of the fixing metal fitting. Be supported. Further, the fixing metal housing is provided with a claw member made of sintered metal in a block shape corresponding to the ratchet tooth of the rotating metal fitting, and the claw member is engaged with the ratchet tooth by a biasing means such as a spring. It is energized in the direction to do. Then, the claw member is forwardly fed to the ratchet teeth, so that the forward rotation of the rotating bracket with respect to the fixed bracket is allowed, and the claw member is engaged with any one of the ratchet teeth, so that the reverse rotation is performed. It is trying to be regulated.
Shoko 7-113 (Figure 1-5)

  However, in the above-described conventional joint fitting, when the claw member is displaced with respect to the ratchet teeth, the claw member cannot be engaged with the ratchet teeth in a good state, resulting in rattling and malfunction. For example, it is difficult to obtain a stable operation.

  An object of the present invention is to solve the above-described problems of the prior art, to provide a joint bracket and a seat chair that can prevent the claw member from being displaced with respect to the ratchet teeth and can reliably obtain a stable operation. And

  In order to achieve the above object, the present invention is summarized as follows.

[1] A pair of ratchets of the rotating metal fitting is pivotally supported in the housing of the fixing metal fitting, and a claw member is provided in the housing so as to be detachable in correspondence with a plurality of ratchet teeth of the ratchet. The claw member is urged in a direction to engage with the ratchet teeth, and the claw member is forward-fed to the plurality of ratchet teeth, thereby allowing a positive rotation of the rotating bracket with respect to the fixed bracket, and A cam provided between the pair of ratchets when the claw member engages with any one of the ratchet teeth to restrict reverse rotation while the rotating bracket exceeds a predetermined rotation range. The claw member is pressed to release the engagement with the ratchet teeth.
The claw member has a pair of claw plates spaced apart from each other in correspondence with the pair of ratchets, and an engagement claw that engages with the ratchet teeth is provided on the tip side of the pair of claw plates,
A cam driven piece corresponding to the cam is provided on the front end side between the pair of claw plates, and a guide protrusion is provided on the cam driven piece so as to protrude from the front end of the claw member.
The joint fitting, wherein the guide protrusion is disposed between the pair of ratchets, and the pair of ratchets are guided by the guide protrusions.

  [2] The joint bracket according to item 1, wherein the cam follower of the claw member is provided with a cam abutting portion with which the cam abuts, and the cam abutting portion is configured as the guide protrusion.

[3] The pitch of the ratchet teeth is set so that the claw member is engaged with the ratchet teeth at a rotational position of seven or more steps within a rotation range of 90 ° with respect to the fixed bracket. ,
3. The joint bracket according to item 1 or 2, wherein three or more engagement claws of the pair of claw plates are provided, and the plurality of engagement claws are configured to be simultaneously engaged with a plurality of corresponding ratchet teeth.

  [4] The joint bracket according to any one of items 1 to 3, wherein the claw member is formed of a laminate of plate-like pieces.

  [5] The joint bracket according to any one of items 1 to 3, wherein the claw member is formed by bending the plate-like member by press working.

[6] A seat frame is fixed to the fixed bracket side in the joint bracket according to any one of the preceding items 1 to 5, and a backrest frame is fixed to the rotating bracket side.
A seat chair, wherein the back frame is configured to be able to be tilted up and down with respect to the seat frame via the joint fitting.

  In the present invention, the following configurations can also be employed.

[11] A pair of ratchets of the rotating metal fitting is pivotally supported in the housing of the fixing metal fitting, and a claw member is provided in the housing so as to be detachable corresponding to the plurality of ratchet teeth of the ratchet. The claw member is urged by the urging means in the direction in which the claw member is engaged with the ratchet teeth, and the claw member is forwardly fed to the plurality of ratchet teeth. And the claw member is engaged with any one of the ratchet teeth, thereby preventing the reverse rotation,
The claw member has a pair of claw plates spaced apart from each other, corresponding to the pair of ratchets,
An engagement claw that engages with the ratchet teeth is provided on the tip side of the pair of claw plates,
The joint bracket, wherein the urging means is provided between the pair of claw plates.

[12] The pitch of the ratchet teeth is set such that the claw member is engaged with the ratchet teeth at a rotational position of seven or more steps within a rotation range of 90 ° with respect to the fixed bracket. ,
12. The joint bracket according to 11 above, wherein three or more engagement claws of the pair of claw plates are provided, and the plurality of engagement claws are configured to be simultaneously engaged with a plurality of corresponding ratchet teeth.

[13] Corresponding to the cam provided between the pair of ratchets, a cam driven piece is provided on the tip side between the pair of claw plates, and the cam driven piece is pushed by the cam, whereby the claw While the member is configured to retract relative to the ratchet,
The cam follower is provided with a guide projection disposed so as to protrude from the tip of the claw member, the guide projection is disposed between the pair of ratchets, and the pair of ratchets are guided by the guide projections. 13. The joint bracket according to item 11 or 12 configured as described above.

  [14] The joint bracket according to item 13, wherein the claw member is formed by stacking and fixing the pair of claw plates and the cam follower.

  [15] The joint bracket according to any one of items 11 to 13, wherein the claw member is formed by bending the plate-like member by press working.

[16] A seat frame is fixed to the fixing bracket side in the joint bracket according to any one of the above items 11 to 15, and a backrest frame is fixed to the rotating bracket side.
A seat chair, wherein the back frame is configured to be able to be tilted up and down with respect to the seat frame via the joint fitting.

  According to the joint bracket of the invention of the above [1], the cam follower plate is provided between the pair of claw plates in the claw member, and the guide protrusion provided at the tip of the cam follower plate is arranged between the pair of ratchets. Since the pair of ratchets are guided by the guide protrusions, the claw member can be positioned in the left-right direction (width direction) with respect to the ratchet. For this reason, the position shift of the engaging claw with respect to the ratchet teeth in the claw member can be prevented, the engaging claw engaging / disengaging operation can be performed more reliably, and a stable operation can be obtained reliably.

  According to the joint bracket of the above invention [2], the cam contact portion is also used as a guide projection for guiding the rotation operation of the ratchet. Can be simplified, productivity can be improved, and cost can be reduced.

  According to the joint bracket of the invention of the above [3], since the pivot bracket can be fixed at many rotational positions, operability and function close to stepless angle adjustment can be obtained, which is satisfactory for the user. Products can be provided.

  According to the joint bracket of the invention of the above [4], the claw member can be formed by laminating press-molded thin plates. Therefore, the claw member can be manufactured while maintaining a high dimensional accuracy, and thus the joint bracket Manufacture can be performed efficiently and easily.

  According to the joint metal fitting of the above-mentioned [5], the claw member can be manufactured only by a series of press molding without performing lamination molding or the like, and the claw member can be manufactured more efficiently.

  According to the above invention [6], a seat chair having the same effects as described above can be provided.

<First Embodiment>
FIGS. 1-5 is a figure which shows the joint metal fitting (P1) which is 1st Embodiment of this invention. As shown in these drawings, the joint bracket (P1) is for a seat chair employed in a connecting portion between a seat frame and a back frame in a seat chair, and includes a fixing bracket (10). And a rotating metal fitting (20), a claw member (30), a cam (40), and a winding spring (50) as urging means are provided as basic components.

  As shown in FIGS. 6 and 7, the fixing bracket (10) includes a cylindrical fixing member attachment piece (11) attached to a fixing member such as a seat frame in a seat and a housing (12 ). The housing (12) includes a pair of substantially circular side walls (12a) (12a) facing each other, and a bottom wall (12b) connecting both side walls (12a) (12a).

  As shown in FIGS. 8 and 9, the rotating metal fitting (20) is provided at the end of the cylindrical rotating member mounting piece (21) attached to the rotating member such as a backrest frame, and is spaced apart. And a pair of opposing ratchets (22) and (22).

  Further, the end of the ratchet (22) in the rotating member mounting piece (21) of the rotating metal fitting (20) abuts on first and second contact pieces (45) and (46) of the cam (40) described later. Possible first and second contact portions (25), (26) are provided.

  A plurality of ratchet teeth (23) are formed at a predetermined fine pitch on the outer peripheral edge of the ratchet (22), and details thereof will be described later. The ratchet teeth (23) are formed at a very small pitch so that the rotating metal fitting (20) can be fixed to the fixing metal fitting (10) in a range of 90 ° in 18 steps, that is, 18 rotation positions. Has been. In the present invention, the number of stages is not particularly limited. However, if the number of stages is large, the rotational position can be finely adjusted. For example, it should be set to at least 5 stages, preferably 7 stages or more, more preferably 10 stages or more, even more preferably 12 stages or more, and even more preferably 15 stages or more. In particular, when it is set to 10 steps or more, operability and functions close to stepless angle adjustment can be obtained, and a product satisfactory for the user can be provided.

  A pair of ratchets (22) of the rotating metal fitting (20) is accommodated in the housing (12) of the fixing metal fitting (10), and is provided at substantially the center of both side walls (12a) (12a) of the housing (12). The shaft (1) is rotatably supported.

  Further, a cam (40) is disposed between the pair of ratchets (22), and the cam (40) rotates on the shaft (1) supporting the ratchet (22) in the same manner as the ratchet (22). It is supported freely.

  As shown in FIG. 10, the cam (40) has a claw provided on the outer peripheral edge between the first and second contact pieces (45) (46) and the first and second contact pieces (45) (46). A peripheral pushing portion (42) for pushing the member, a peripheral concave portion (41) for releasing the claw member push, and a guide portion (43) provided in an inclined manner from the peripheral concave portion (41) to the peripheral pushing portion (42) have.

As shown in FIGS. 1 to 5, the first and second contact pieces (45) and (46) of the cam (40) are arranged so as to protrude outward (outer peripheral side) along the radial direction from the ratchet (22). Then, as will be described later, the cam (40) is configured to rotate by abutting against the first and second contact portions (25) and (26) of the rotating metal fitting (20). The peripheral pushing part (42) of the cam (40) is arranged on the inner side (inner peripheral side) along the radial direction than the teeth (23) of the ratchet (22), and the peripheral concave part (41) and the guide part (43). Needless to say, it is arranged closer to the inner periphery than the ratchet teeth (23).

  In this embodiment (including the second embodiment described later), the “radial direction” means a direction extending in the radial direction with respect to the circumferential direction when the rotation direction of the ratchet (22) is the circumferential direction. is there. Further, the “left-right direction (width direction)” to be described later refers to the interval direction between the pair of ratchets (22) and (22), that is, the direction along the rotation axis of the rotating metal fitting (20) and the claw member (30). It is.

  As shown in FIGS. 11 and 12, the claw member (30) disposed in the housing (12) of the fixing bracket (10) includes a pair of claw plates (32) and (32) disposed on both sides, and both claw plates. (32) Two cam follower plates (31) (31) arranged between (32) are provided, and these plate members are laminated and fixed by rivets (35).

  In the claw member (30) constituted by the laminated body, the cam follower plates (31) (31) arranged in the middle also have a function as a spacer, and a pair of claw plates (32) ( 32) are arranged at intervals via the cam follower plates (31) and (31), and are arranged corresponding to the pair of ratchets (22) and (22) of the rotating metal fitting (20). Yes. The pair of nail plates (32), (32) has a plurality of engaging claws (33) that can be engaged with the teeth (23) of the ratchet (22) on the distal end side, and on the proximal end side, Shaft support holes (34) and (34) are respectively formed.

  In this embodiment, each claw plate (32) is formed with six engaging claws (33), and these engaging claws (33) correspond to a plurality of (six) ratchet teeth (23). ).

  In the present invention, it is preferable to form a large number of claws on the nail plate (32). That is, when a large number of claws are formed, a large engagement area between the claw member (30) and the ratchet (22) can be secured even if the engagement claws (33) and the ratchet teeth (23) are formed small. It is possible to avoid local concentration of the load when the member (30) is engaged with the ratchet (22). That is, the load at the time of engagement can be dispersed and received over a wide area, the breakage of the engagement claws (33) and the ratchet teeth (23) can be effectively prevented, and the load resistance and strength can be improved. .

  Here, when the pitch of the ratchet teeth (22) is set finely so that the rotating metal fitting (20) can be fixed at the rotational position of 10 steps or more as in this embodiment, it is formed on each nail plate (32). The number of engaging claws may be three or more, preferably four or more, more preferably five or more.

On the distal end side of the claw member (30), the cam follower plate (31) is provided with a cam contact portion (31a) as a guide projection so as to protrude further toward the distal end side than the claw tip of the engaging claw (33). It has been. Further, the cam follower plates (31) (31) are arranged in the half of the distal end side between the pair of claw plates (32) (32), and the proximal end side between the pair of claw plates (32) (32). Is formed with a winding spring installation space (36).

Note in have you to this embodiment, the cam follower piece is constituted by a cam follower plate (31).

  As shown in FIGS. 1 to 5, the shaft support hole (34) on the proximal end side of the claw member (30) in a state where the claw member (30) is disposed in the housing (12) of the fixing bracket (10). ) (34), and is pivotally supported by the fixing bracket (10) via the shaft (2) inserted therethrough. Thereby, the engaging claws (33) (33) of the pair of claw plates (32), (32) in the claw member (30) are respectively applied to the ratchet teeth (23), (23) of the pair of ratchets (22), (22). The cam contact portion (31a) of the cam follower plate (31) in the claw member (30) is disposed between the pair of ratchets (22) and (22) while corresponding to the cam (40). Be placed.

  When the claw member (30) swings counterclockwise (engagement direction) toward the paper surface of FIG. 1 with the shaft (2) as a fulcrum, a pair of claw plates (30) 32) The engaging claws (33) of (32) (33) engage with one of the ratchet teeth (23) (23) of the pair of ratchets (22) (22), and clockwise (withdrawal direction). The engaging claws (33) (33) of the claw member (30) are configured to be disengaged from the ratchet teeth (23) (23). In this engagement / disengagement operation, the cam contact portion (31a) of the cam follower plate (31) in the claw member (30) is disposed between the pair of ratchets (22) (22), and the ratchet (22) Interference with (22) is avoided. Further, the outer side surfaces of the cam contact portion (31a) of the cam follower plate (31) are guided by the inner surfaces of the pair of ratchets (22) and (22), so that the claw member (30) is left and right with respect to the ratchet (22). The positioning of the direction is achieved, and the engagement / disengagement operation of the pawl member (30) with respect to the ratchet (22) is performed smoothly.

  As shown in FIG. 5, the winding spring installation space (36) on the proximal end side between the pair of claw plates (32) (32) of the claw member (30) is provided in a wound state on the shaft (2). A winding spring (50) is arranged. One end of the winding spring (50) is engaged with the proximal end portion of the cam follower plate (31) in the claw member (30) in a press-contact state, and the other end is a fixing member mounting piece ( 11) is engaged in a pressure contact state. The claw member (30) is urged to rotate in a direction for engaging the engaging claw (33) with the ratchet teeth (23) by the urging force of the winding spring (50).

In this configuration, as shown in FIGS. 1 and 2, in a state where the engaging claw (33) of the claw member (30) is engaged with the ratchet teeth (23), the ratchet (22) is rotated in the clockwise direction (reverse rotation direction). The rotation is restricted. Further, in this engaged state, when the ratchet (22) tries to rotate counterclockwise (forward rotation direction), the engagement claw (33) is pushed in the disengagement direction by the ratchet teeth (23) and is engaged. When is released , the ratchet teeth (23) are moved forward in a state where the engaging claws (33) are in contact with the ratchet teeth (23) .

  In the joint bracket (P1) having this configuration, as shown in FIG. 1, the claw member (20) in the state where the pivot bracket (20) is open with respect to the fixed bracket (10) (the backrest is laid backward). 30), the cam contact portion (31a) of the cam follower plate (31) is disposed in the peripheral recess (41) of the cam (40), whereby the claw member (30) is attached to the winding spring (50). The engagement claws (33) and (33) are engaged with the initial engagement positions of the ratchet teeth (23) and (23) by being biased in the engagement direction by the force.

  In this initial engagement position (first-stage engagement position), as described above, even when a load is applied in the direction of opening the rotating metal fitting (20), that is, in the clockwise direction, the engagement claw of the claw member (30) (33) When the (33) is engaged with the ratchet teeth (23) (23), the rotation in the opening direction (reverse direction) is restricted.

  Further, from the initial state of FIG. 1, when the rotating metal fitting (20) is closed with respect to the fixing metal fitting (10), that is, when it is rotated counterclockwise, the engaging claw is engaged by the ratchet teeth (23) (23). (33) After the (33) is pushed in the disengagement direction and each engaging claw (33) (33) gets over the adjacent ratchet teeth (23) (23), the urging force of the winding spring (50) The engaging claws (33) (33) engage with the ratchet teeth (23) (23) at the next stage, respectively. In this way, the rotating metal fitting (20) is rotated counterclockwise with respect to the fixed metal fitting (10) while the respective engaging claws (33) (33) sequentially ride over the ratchet teeth (23) (23). Further, when the rotating metal fitting (20) is stopped at an arbitrary rotational position during this rotation operation, each engaging claw (33) (33) has a corresponding ratchet tooth (23) as in the initial state. ) By engaging with (23), the rotating metal fitting (20) is restricted from rotating in the reverse direction (clockwise) and is maintained at its rotational position.

  As shown in FIG. 2, by rotating the rotating metal fitting (20), the rotating metal fitting (20) is rotated along the positive rotation direction to the final engagement position, and each engagement claw (33) (33 ) Engages with the ratchet teeth (23) and (23) at the final engagement position, respectively, the rotating metal fitting (20) is fixed at a position of approximately 90 ° with respect to the fixing metal fitting (10).

  When the rotating metal fitting (20) is further rotated in the normal rotation direction with respect to the fixed metal fitting (10) from this final engagement position as shown in FIG. 3, the second contact portion (26 of the rotating metal fitting (20) is obtained. ) Abuts against the second contact piece (46) of the cam (40), and the cam (40) rotates a little in the counterclockwise direction (forward rotation direction). Thereby, the cam contact part (31a) of the cam follower plate (31) in the claw member (30) resists the urging force of the winding spring (50) along the guide part (43) of the cam (40). The claw member (30) moves backward with respect to the ratchet (22) (22) by being pushed in and riding on the peripheral pushing portion (42) of the cam (40). Thus, the engaging claws (33) and (33) of the claw member (30) are released from the ratchet teeth (23) and (23), the engagement is released, and the released state is maintained.

  Therefore, in this state, the rotating metal fitting (20) can be rotated in the reverse rotation direction.

  Further, from this state (the state at the end position in the forward rotation direction), when the rotating metal fitting (20) is rotated in the opening direction (the reverse rotation direction) and returned to the state immediately before the initial position, As shown in FIG. 4, the first contact portion (25) of the rotating metal fitting (20) abuts the first contact piece (45) of the cam (40). Accordingly, when the rotating metal fitting (20) is further rotated in the reverse rotation direction from this state, the cam (40) is rotated by a small amount in the clockwise direction (reverse rotation direction), and the cam follower plate (31) in the claw member (30). ) Is disposed at the position of the peripheral recess (41) from the peripheral pushing part (42) of the cam (40) through the guide part (43). Thereby, the claw member (30) advances with respect to the ratchet (22) (22) by the urging force of the winding spring (50), and the cam contact portion (31a) of the claw member (30) moves to the cam (40). At the same time, the engaging claws (33) and (33) of the claw member (30) are respectively engaged with the corresponding ratchet teeth (23) and (23). Thus, the initial engagement state (see FIG. 1) is restored.

  As described above, in the joint bracket (P1) of the present embodiment, the claw member (30) is constituted by the pair of claw plates (32) and (32) arranged on both sides, and the pair of claw plates ( 32) Since the winding spring (50) for urging the claw member (30) in the engaging direction is arranged between the (32), the winding spring (50) is in the left-right direction of the claw member (30). It is arranged at an intermediate position along the center position in the (width direction), that is, along the axial direction of the claw member (30). For this reason, the engaging claws (33) (33) provided on both the nail plates (32) (32) are equal to the left and right ratchet teeth (23), (23) of the pair of ratchets (22), (22). Can be engaged in a well-balanced manner with a small pressing force. Accordingly, a good and well-balanced engagement state can be obtained in the entire width direction, for example, the claw member (30) can be smoothly fed forward during forward rotation, and the occurrence of rattling or malfunction can be prevented. Thus, stable operation can be reliably obtained, and a high-quality joint metal fitting product can be provided.

  Furthermore, in this embodiment, the cam contact portion (31a) is formed so as to protrude from the tip of the cam follower plate (31) provided between the pair of claw plates (32) and (32). Since (31a) is disposed between the pair of ratchets (22) and (22) as guide protrusions, the outer surfaces on both sides of the cam contact portion (31a) are the inner surfaces (opposing surfaces) of the pair of ratchets (22) and (22). ), The claw member (30) can be positioned in the left-right direction (width direction) with respect to the ratchet (22) (22). For this reason, it is possible to prevent displacement of the engaging claws (33) and (33) with respect to the ratchet teeth (23) and (23) in the claw member (30), and the engagement claws (33) and (33) are more reliably engaged. And the operational reliability can be further improved. Further, the outer surfaces on both sides of the cam contact portion (31a) are guided by the inner surfaces of the pair of ratchets (22) and (22), so that the cam follower plate (31) in the claw member (30) is left and right relative to the cam (40). Positioning in the direction (width direction) can also be achieved. For this reason, the cam (40) can be surely contacted with the cam follower plate (31) without difficulty, the follower operation of the claw member (30) can be performed more smoothly, and the operation reliability can be further improved. Can do.

  Further, in the present embodiment, the cam contact portion (31a) is also used as a guide projection for guiding the rotation operation of the ratchet (22). Can be simplified, productivity can be improved, and cost can be reduced.

  In the present invention, the guide protrusion may be formed separately from the cam contact portion (31a). Further, when the guide protrusion is separately formed, the peripheral pushing portion (42) of the cam (40) is not necessarily arranged between the ratchets (22), and is more radial than the teeth (23) of the ratchet (22). You may make it arrange | position outside.

  In the present embodiment, since the claw members (30) are formed by laminating and integrating the claw plates (32) (32) on both sides and the cam driven plates (31) (31) on the inside, for example, Compared to the case where the claw member is formed of an integrally molded product such as a sintered block, the engagement claw (33) may be processed on the individual claw plate (32) in a thin plate state. The claw (33) can be easily processed, and the claw member (30) can be easily manufactured and the joint metal fitting itself can be easily manufactured while maintaining high dimensional accuracy. In particular, as in the present embodiment, when a multi-stage joint bracket (P1) is manufactured, that is, the engaging claws (33) of the claw member (30) are aligned with the ratchet teeth (23), and a plurality of pitches are provided at a small pitch. In such a case, by adopting a laminated body as the claw member (30), the engagement claw (33) can be easily formed with high accuracy, and the multistage articulated metal fitting close to the stepless adjustment type. (P1) can be provided reliably.

  And since the nail | claw member (30) is manufactured with a laminated body, cost can be reduced compared with the case where it manufactures with an expensive sintered block.

  Further, in this embodiment, the ratchet teeth (23) are fixed so that the rotating metal fitting (20) can be fixed in 18 steps, that is, at 18 rotation positions within a range of 90 ° with respect to the fixing metal fitting (10). Are formed at a small pitch. For this reason, the rotating metal fitting (20) can be fixed at multi-stage rotational positions, and operability and functions close to stepless angle adjustment can be obtained, and a product that is satisfactory for the user can be provided.

  In the above embodiment, the case where two cam followers (31) stacked on the middle (inner side) of the claw member (30) are used as an example. However, in the present invention, the middle of the claw member (30) is described. The number of cam follower pieces such as cam follower plates arranged on the head is not limited, and may be one (one) or three (three) or more.

<Second Embodiment>
13-17 is side surface sectional drawing which shows the joint metal fitting (P2) which is 2nd Embodiment of this invention. As shown in the figure, the joint bracket (P2) of the second embodiment is different from the joint bracket (P1) of the first embodiment in that the joint bracket (P1) of the first embodiment is used. The claw member (30) is constituted by a laminated body, whereas the claw member (130) used in the joint fitting (P2) of the second embodiment is formed by a bent product of a plate-like member. It is that.

  That is, as shown in FIGS. 18 and 19, the claw member (130) in the joint bracket (P2) of the present embodiment has a pair of claw plates (132) and (132) formed by bending a punched blank product into an inverted U shape. The cam follower piece (131) integrally formed so as to protrude forward from the upper connecting piece connecting the pair of nail plates (132) (132) is bent downward in a stepped manner. The tip of the cam follower (131) is disposed between the pair of claw plates (132) (132).

  Further, a plurality of engaging claws (133) (133) are formed at the upper ends of the distal ends of the pair of nail plates (132) (132), respectively, and shaft support holes (134) (134) are formed at the proximal end side. Is formed.

  In this claw member (130), the tip side protruding portion of the cam driven piece (131) is configured as a cam contact portion (131a) that also serves as a guide projection, and a pair of claw plates (132) (132). A proximal end side in between is configured as a winding spring installation space (136).

  This claw member (130) is incorporated into the joint fitting (P2) as in the first embodiment.

  That is, as shown in FIGS. 13 to 17, in the state where the claw member (130) is disposed in the housing (12) of the fixing bracket (10), the shaft support hole (134) ( 134) is rotatably supported by the fixing bracket (10) through the shaft (2) inserted through the shaft (2). Thereby, the engaging claws (133) (133) of the pair of nail plates (132), (132) in the nail member (130) are respectively applied to the ratchet teeth (23), (23) of the pair of ratchets (22), (22). The cam contact portion (131a) of the cam follower (131) in the claw member (130) is disposed between the pair of ratchets (22) and (22) while corresponding to the cam (40). Be placed.

  Further, similarly to the first embodiment, the winding spring installation space (136) on the proximal end side between the pair of claw plates (132) (132) of the claw member (130) is wound around the shaft (2). The winding spring (50) provided in the is arranged. One end of the coil spring (50) is engaged with the proximal end portion of the cam follower (131) in the claw member (130) in a press-contact state, and the other end is a fixing member mounting piece ( 11) is engaged in a pressure contact state.

  In the second embodiment, other configurations are substantially the same as those in the first embodiment, and therefore, the same or corresponding parts are denoted by the same or corresponding reference numerals, and redundant description is omitted.

  In the joint fitting (P2) of the second embodiment, the same operation as described above is performed. That is, when the rotating metal fitting (20) is rotated counterclockwise (forward rotation direction) with respect to the fixed metal fitting (10) from the initial state of FIG. 13, there are many engaging claws (133) and (133). The ratchet teeth (23) and (23) are sequentially fed so as to be sequentially engaged.

  Then, as shown in FIG. 14, the rotating metal fitting (20) is rotated along the forward rotation direction to the final engagement position, and each engagement claw (133) (133) is moved to each ratchet tooth ( 23) When engaged with (23), the rotating metal fitting (20) is fixed at a position of approximately 90 ° with respect to the fixing metal fitting (10).

  Further, from this final engagement position, as shown in FIG. 15, when the rotating metal fitting (20) is rotated in the normal rotation direction with respect to the fixing metal fitting (10), the cam (40) is rotated a little counterclockwise. When the cam (40) is pushed, the engaging claws (133) and (133) of the claw member (130) are released from the ratchet teeth (23) and (23), and the engagement is released.

  From this state, when the rotating metal fitting (20) is rotated clockwise and returned to the state immediately before the initial position, the cam (40) rotates clockwise by a small amount as shown in FIG. Then, as shown in FIG. 13, the cam contact portion (131a) of the claw member (130) is inserted into the peripheral recess (41) of the cam (40), and at the same time, each engagement of the claw member (130). The nail | claw (133) (133) engages with a corresponding ratchet tooth (23) (23), respectively.

  Thus, also in the joint metal fitting (P2) of this 2nd Embodiment, the operation | movement similar to the joint metal fitting (P2) of the said 1st Embodiment is performed.

  Moreover, in the joint metal fitting (P2) of this 2nd Embodiment, the same effect can be acquired similarly to the said 1st Embodiment. Furthermore, in the joint bracket (P2) of the second embodiment, the claw member (130) is constituted by a bending molded product by press working, so from the punching of the original plate to the final finishing molding. Can be performed only by press molding. Compared to the case where the lamination integration step is sandwiched in the middle as in the first embodiment, the manufacture of the claw member (130), and thus the joint fitting (P2) Can be manufactured more efficiently, and the cost can be further reduced.

<Modification>
In each of the above-described embodiments, the case where the joint bracket of the present invention is applied to a seat chair has been described. However, the present invention is not limited thereto, and for example, the pivoting support of the swing type heel applied to the eaves of a store, etc. It can also be used for mechanisms, and it can also be used for rotating support mechanisms for swinging footrests that are applied to airplane first class seats, swinging armrest support mechanisms for luxury chairs, etc. Furthermore, it can also be employed in a support mechanism for a rotary drawer type movable storage shelf applied to a kitchen or a study.

  Moreover, in the said embodiment, although the rotation metal fitting (20) is applied to the joint metal fitting of the type engaged in a forward feed from the state opened with respect to the fixed metal fitting (10), this invention is not restricted only to it. The ratchet teeth can be reversed, mounted with the pivoting bracket inverted, or the ratchet teeth reversed, and the pivoting bracket mounted inverted. The forward feed direction and forward feed range of the moving bracket can be freely changed and set.

  Further, in the above-described embodiment, the joint bracket in which the rotating bracket is operated within the range of 90 degrees with respect to the fixed bracket has been described. However, the present invention is not limited to this, and the rotating bracket has an angle of 90 ° with respect to the fixed bracket. The present invention can also be applied to a joint fitting that operates in a range exceeding the above range.

  In the present invention, the rotating metal fitting may be configured to rotate relative to the fixed metal fitting. For example, a structure in which both the fixing metal fitting and the rotating metal fitting rotate may be employed. .

  The joint bracket of the present invention can be applied to, for example, a bracket for a rotation connecting portion between a seat frame and a back frame of a seat chair.

It is a sectional side view which shows the joint metal fitting which is 1st Embodiment of this invention in an open state. It is side surface sectional drawing which shows the joint metal fitting of 1st Embodiment in a final engagement state. It is side surface sectional drawing which shows the joint metal fitting of 1st Embodiment in a normal rotation termination state. It is side surface sectional drawing which shows the joint metal fitting of 1st Embodiment in the state just before an initial position return. It is a top view which shows the joint metal fitting of 1st Embodiment. It is side surface sectional drawing which shows the fixing metal fitting in the joint metal fitting of 1st Embodiment. It is a top view which shows the fixing metal fitting of 1st Embodiment. It is side surface sectional drawing which shows the rotation metal fitting in the joint metal fitting of 1st Embodiment. It is side surface sectional drawing which shows the rotation metal fitting of 1st Embodiment. It is a side view which shows the cam in the joint metal fitting of 1st Embodiment. It is a perspective view which shows the nail | claw member applied to the joint metal fitting of 1st Embodiment. It is a figure which shows the nail | claw member of 1st Embodiment, Comprising: The figure (a) is a side view, The figure (b) is a front view, The figure (c) is a top view, The figure (d) is side sectional drawing. FIG. 4E is a horizontal sectional view. It is side surface sectional drawing which shows the joint metal fitting which is 2nd Embodiment of this invention in an open state. It is side surface sectional drawing which shows the joint metal fitting of 2nd Embodiment in a final engagement state. It is side surface sectional drawing which shows the joint metal fitting of 2nd Embodiment in a normal rotation termination state. It is side surface sectional drawing which shows the joint metal fitting of 2nd Embodiment in the state just before an initial position return. It is a top view which shows the joint metal fitting of 2nd Embodiment. It is a perspective view which shows the nail | claw member applied to the joint metal fitting of 2nd Embodiment. It is a figure which shows the nail | claw member of 2nd Embodiment, Comprising: The figure (a) is a side view, The figure (b) is a front view, The figure (c) is a top view, The figure (d) is side sectional drawing. It is.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Fixed metal fitting 12 ... Housing 20 ... Turning metal fitting 22 ... Ratchet 23 ... Ratchet tooth 30, 130, 230 ... Claw member 31, 131, 231 ... Cam driven piece 31a, 131a ... Cam contact part (guide protrusion)
32,132,232 ... nail plate 33,133,233 ... engaging claw 40 ... cam

Claims (6)

A pair of ratchets of the rotating metal fitting is pivotally supported in the housing of the fixing metal fitting, and a claw member is provided in the housing so as to be detachable in correspondence with a plurality of ratchet teeth of the ratchet, and an urging means The claw member is urged in a direction to engage with the ratchet teeth, and the claw member is forwardly fed in a state where the claw member is in contact with the plurality of ratchet teeth. Is allowed, and the claw member is engaged with one of the ratchet teeth to restrict reverse rotation, while the claw member is pushed by a cam provided between the pair of ratchets. An articulated metal fitting that is disengaged from the ratchet teeth,
The claw member has a pair of claw plates spaced apart from each other in correspondence with the pair of ratchets, and an engagement claw that engages with the ratchet teeth is provided on the tip side of the pair of claw plates,
A cam driven piece corresponding to the cam is provided on the front end side between the pair of claw plates , and the cam is used as a guide protrusion disposed on the cam driven piece so as to protrude from the front end of the claw member. A cam contact portion to contact ,
The cam contact portion is disposed between the pair of ratchets, and the pair of ratchets are configured to be guided by the cam contact portion ,
The outer peripheral edge of the cam is provided with a peripheral pressing part for pushing the claw member, a peripheral concave part for releasing the claw member, and a guide part formed in an inclined shape from the peripheral concave part to the peripheral pressing part. And
When the cam contact portion is disposed in the peripheral recess, the claw member is urged in a direction to engage the ratchet teeth by the urging force of the urging means, and the engagement claw is urged by the ratchet teeth. On the other hand, the cam contact portion is pushed along the guide portion against the urging force of the urging means by the forward rotation of the rotating metal fitting and rides on the peripheral pushing portion. The engagement between the engagement claw and the ratchet teeth is released and maintained in the released state.
All of the peripheral pushing part, the peripheral concave part, and the guide part of the cam are arranged on the inner side along the radial direction than the ratchet teeth . The joint bracket according to claim 1, wherein the biasing means is provided between the pair of claw plates. The pitch of the ratchet teeth is set such that the claw member is engaged with the ratchet teeth at a rotational position of seven or more stages within a rotation range of 90 ° with respect to the fixed bracket.
The joint bracket according to claim 1 or 2, wherein three or more engagement claws of the pair of claw plates are provided, and the plurality of engagement claws are configured to be simultaneously engaged with a plurality of corresponding ratchet teeth. .   The joint bracket according to any one of claims 1 to 3, wherein the claw member is constituted by a laminated body of plate-like pieces.   The joint bracket according to any one of claims 1 to 3, wherein the claw member is formed by bending a plate-like member by press working. A seat frame is fixed to the fixed bracket side in the joint bracket according to any one of claims 1 to 5, and a backrest frame is fixed to the rotating bracket side.
A seat chair, wherein the back frame is configured to be able to be tilted up and down with respect to the seat frame via the joint fitting .

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