JP4472089B2 - Seat recliner structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a seat recliner structure.
[0002]
[Prior art]
Conventionally, a seat recliner structure interposed between a seat bottom and a seat back is known. The recliner structure includes a first bracket fixed to one of a seat bottom and a seat back attached to the seat bottom so as to be tiltable, and fixed to the other, and relative to the first bracket around a rotation center. It is interposed between the second brackets connected so as to be rotatable.
[0003]
The recliner structure is provided with a cam that is interposed between the first bracket and the second bracket, and is fixed so as to be able to rotate about a support shaft concentric with the rotation center. In this cam, a locking plate having a locking tooth on the tip surface is moved forward and backward in the radial direction between the first and second brackets by forward and reverse rotation of the support shaft. The first bracket is provided with a radially extending guide groove formed between opposed walls parallel to each other. The lock plate moves forward and backward in the guide groove as the cam rotates. Stopper teeth come and go from the guide groove.
[0004]
On the other hand, the second bracket has internal teeth formed along a circular locus concentric with the rotation center. As a result, the lock plate protrudes outward from the guide groove by the rotation of the cam, and the engaging teeth mesh with the inner teeth, thereby restricting the relative rotation between the first bracket and the second bracket, and the cam. The first bracket and the second bracket can be rotated relative to each other by releasing the engagement of the locking teeth with the inner teeth by the reverse rotation of the first bracket.
[0005]
Therefore, by attaching an operating rod to the support shaft and rotating the support shaft forward and backward by operating this operating rod, the locking teeth can be engaged with the inner teeth and the tilt position of the seat back can be locked. It is possible to change the tilt position by releasing the meshing.
[0006]
[Problems to be solved by the invention]
By the way, in the conventional recliner structure as described above, the internal teeth formed on the second bracket are partially provided between these positions corresponding to the upright position and the backward position of the seat back. Since the seat back tilt position can only be set at an arbitrary angle between the upright position and the rearward position, the seat with such a recliner structure is the front seat of the vehicle. When the passenger in the rear seat gets on and off, if the seat back is tilted to the foremost bent position and then returned to the original position, the tilted position is temporarily locked at the first lock position (first-stage lock position). Therefore, the seated occupant in the front seat must release the lock and readjust the seat back to a desired tilted posture, which is very troublesome.
[0007]
In addition, even if you try to change the range of tiltable position where the seat back can be locked, the conventional recliner structure cannot change the internal tooth formation range, so lock the seat back at a position beyond this range. In other words, the seat back position setting range is narrow.
[0008]
The present invention has been made to solve the above-described conventional problems, and an object thereof is to provide a seat recliner structure in which a lock range of a tilt position of a seat back can be arbitrarily set. It is said.
[0009]
[Means for Solving the Problems]
According to the first aspect of the present invention, a first bracket fixed to one of the seat bottom and the seat back, and a second bracket fixed to the other and connected to the first bracket so as to be relatively rotatable about a rotation center. A bracket, a cam that is interposed between the first and second brackets and rotates around the rotation center by the operation of the operating rod, and between the first and second brackets linked to the forward and reverse rotation of the cam. And a lock plate that protrudes and protrudes in the radial direction, and the first bracket is fitted with the lock plate, and the circumferential surface has a circular protrusion along the circular locus around the rotation center, and the circular protrusion is recessed. A guide groove for guiding the lock plate to protrude and project, and the second bracket has a circular recess into which the circular protrusion is fitted in a sliding contact state, and a lock plate tip protruding from the guide groove. With locking teeth Seats provided with inner teeth formed on the inner peripheral surface of the circular recess to be joined, and provided with biasing means for biasing the cam around the support shaft so that the lock plate protrudes from the guide groove In this recliner structure, a memory plate is provided between the first and second brackets to mask the inner teeth and prevent the lock plate from engaging with the inner teeth. The memory plate is an annular plate body. And a pair of mask pieces extending from the opposing peripheral surface of the plate main body and interposed between the inner teeth of the circular recess and the circular protrusion to mask the inner teeth within a predetermined range And an operation lever for projecting the plate body outwardly from the plate body.
[0010]
According to the present invention, by rotating the memory plate, the mask position of the internal teeth by the mask piece provided on the plate body is changed. Then, by changing the mask position of the internal teeth by the mask piece, the meshing position of the lock plate with the internal teeth is changed, thereby changing the lockable position of the tilted posture of the seat back. That is, the memory plate stores a so-called lock-free position of the seat back.
[0011]
Accordingly, the seat back lock-free position can be arbitrarily changed by rotating the plate body (that is, the seat back lockable position can be arbitrarily set). The selection range of the tilt position is expanded, and this makes it possible to immediately reproduce the tilt position of the seat back that is more suitable for the situation.
[0012]
In addition, since the position of the first stage of the seat back lock generally differs depending on the vehicle type, in the conventional recliner structure, it is necessary to make a plurality of types of second brackets with different internal tooth formation positions depending on the vehicle type. However, in the present invention, by forming internal teeth on the entire inner peripheral surface of the second bracket, it is possible to cope with various types of vehicles only by shifting the position of the mask piece of the memory plate. Sharing is realized.
[0013]
The invention according to claim 2 is characterized in that, in the invention according to claim 1, the plate body is provided with an operation lever for rotating the plate body projecting outward. To do.
[0014]
According to this invention, it is possible to rotate the plate body by operating the operation lever protruding outward, and the mask piece position setting operation is facilitated.
[0015]
According to a third aspect of the present invention, in the first or second aspect of the present invention, the mask piece has a positioning projection that is detachably engaged with the internal teeth by elastic deformation. is there.
[0016]
According to the present invention, when the memory plate is rotated by the operation of the operation lever, the positioning protrusions are engaged with and disengaged from the internal teeth of the second bracket. You can feel the amount of rotation.
[0017]
In addition, since the rotation position of the memory plate once set is maintained at a position where the positioning protrusion meshes with the inner teeth, the second bracket is provided by tilting the seat back unless a force is applied to the operation lever. Thus, the inconvenience of changing the setting position of the memory plate by the rotation is avoided, and the lock-free range once set is securely held.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an explanatory view in a side view showing an embodiment of a reclining seat to which the recliner structure of the present invention is applied. As shown in this figure, a vehicle seat S includes a seat bottom S1 and a seat back S2, and the seat bottom S1 and the seat back S2 are connected to each other by a pair of recliners 1 so as to tilt forward and backward.
[0019]
FIG. 2 is an exploded perspective view, partly cut away, showing an embodiment of the recliner 1, and FIG. 3 is an assembled perspective view thereof. As shown in these drawings, the recliner 1 includes a first bracket 2 fixed to the seat bottom S1 (FIG. 1), and a second bracket 3 fixed to the seat back S2 so as to face the first bracket 2. A pair of lock plates 4 interposed between the brackets 2 and 3; a cam 5 that rotates in the forward and reverse directions around the cam shaft 6 and moves the pair of lock plates 4 in the direction of separating and contacting; and the cam shaft 6 is interposed between the first bracket 2 and the second bracket 3, an operating rod 7 that rotates forward / reversely about the axis 6, a holding plate 8 that holds the operating rod 7 while preventing it from coming off. The basic configuration includes a memory plate 9.
[0020]
The first bracket 2 is formed with a semicircular upper part and a lower lower part, and an insertion hole 21 through which the cam shaft 6 is inserted in a semicircular center of curvature. A pair of front and rear guide members 22 are bulged and raised on the surface inward in the width direction (left side in FIG. 2). Each guide member 22 is formed in an arc shape with the insertion hole 21 as the center, and the shape is set symmetrically with respect to the insertion hole 21. A circular convex portion according to the present invention is formed by the pair of guide members 22.
[0021]
4 is a perspective view of the X-ray view and the Y-ray view of FIG. 2, and the guide recesses 23 extending in the vertical direction are respectively provided on the opposing surfaces of the guide members 22. By forming the recesses 23, guide protrusions 22a are formed on the upper and lower portions of the respective guide members 22 so as to protrude in opposite directions.
[0022]
An accommodation space 24 for accommodating the lock plate 4 and the cam 5 is formed between the opposing guide recesses 23, and a part of each lock plate 4 (a locking tooth described later) is provided between the opposing surfaces of the guide protrusion 22a. A pair of upper and lower guide grooves 25 are formed for fitting the plate 41) in a sliding contact state.
[0023]
In addition, arc-shaped guide ridges 22 b concentric with the outer peripheral surface of the guide member 22 are provided on the surface of each guide member 22, and these guide ridges 22 b slide into the circular guide grooves 31 a of the second bracket 3. It is inserted in the contact state.
[0024]
As shown in FIGS. 2 and 4, the second bracket 3 is formed in a circular shape in the lower part and in a substantially rectangular shape in the upper part. On the left side surface of the second bracket 3, a circular bulging portion 31 is bulged by pushing up from the back side (right surface) with the center of curvature of the circular portion as the center. A through hole 32 facing the insertion hole 21 of the first bracket 2 is formed in the center portion.
[0025]
Further, a mounting recess (circular recess) 33 is provided on the right side of the circular bulging portion 31 in FIG. The inner diameter of the mounting recess 33 is set to be slightly larger than the radius of curvature of the pair of guide members 22, and the arc bracket outer peripheral surface of each guide member 22 is obtained by combining the first bracket 2 and the second bracket 3. The brackets 2 and 3 are connected so as to be rotatable about the cam shaft 6 (FIG. 2) in a state where a slight gap is formed between the mounting recess 33 and the inner peripheral surface of the mounting recess 33.
[0026]
Further, a circular guide groove 31a concentric with the through-hole 32 corresponding to the guide protrusion 22b is formed in the right side surface of the mounting recess 33, and the guide protrusion 22b is fitted into the circular guide groove 31a. The relative rotation between the first bracket 2 and the second bracket 3 is performed more stably. On the inner peripheral surface of the mounting recess 33, internal teeth 34 formed by cutting in the radial direction are provided over the entire circumference.
[0027]
The upper edge of the second bracket 3 is provided with attachment holes at the front and rear end portions, and the second bracket 3 is fixed to the seat back S2 by being bolted through the attachment holes. It has become. In addition, the second bracket 3 has a positioning projection that protrudes in the direction of the first bracket 2 between the front and rear mounting holes. These positioning protrusions are for positioning the mounting position of the presser plate 35 (FIG. 2) that holds the first bracket 2 so as not to be detached from the second bracket 3.
[0028]
Then, by fixing the presser plate 35 to the second bracket 3 in a state where the first bracket 2 is stacked on the second bracket 3, the presser plate 35 presses the upper portion while allowing the first bracket 2 to rotate. Thus, the upper portion of the first bracket 2 is prevented from being separated from the second bracket 3.
[0029]
Further, mounting holes are formed in the lower edge portion of the first bracket 2 at the front and rear ends, respectively, and the first bracket 2 is fixed to the seat bottom S1 by bolting through these mounting holes. It is like that.
[0030]
FIG. 5 is a front view showing an embodiment of the lock plate 4. FIG. 5A shows a state in which the locking teeth 41a of the lock plate 4 protrude outside from the guide groove 25, and FIG. The state immersed in the guide groove 25 is shown, respectively. As shown in FIG. 5, the lock plate 4 is integrally connected to the locking tooth plate 41 that is fitted in the guide groove 25 of the first bracket 2 so as to be movable up and down, and to the base end side of the locking tooth plate 41. And a bowl-shaped plate 42.
[0031]
The locking tooth plate 41 has locking teeth 41 a that mesh with the internal teeth 34 (FIGS. 2 and 4) of the second bracket 3 formed at the leading edge, and the guide member 22 is in the mounting recess 33. When the engaging teeth 41a mesh with the inner teeth 34 in the fitted state, the relative rotation between the first bracket 2 and the second bracket 3 is restricted.
[0032]
The saddle plate 42 is shaped so that the outer side edge is in sliding contact with the inner edge of the guide recess 23 and the inner edge is in sliding contact with the outer peripheral surface of the cam 5. And a longitudinal plate 44 extending in the opposite direction to the locking tooth plate 41 from a clockwise end portion of the lateral plate 43. The length dimension of the vertical plate 44 is set shorter than the vertical dimension of the guide recess 23 by a distance d so that the vertical plate 44 can move up and down within the guide recess 23 by a distance d.
[0033]
The distance d is set to be slightly larger than the tooth height dimension of the locking teeth 41a, and the locking tooth plate 41 is moved when the bowl-shaped plate 42 moves radially outward from the insertion hole 21 (FIG. 2). The engaging teeth 41a mesh with the inner teeth 34 (FIGS. 2 and 4), while the hook-shaped plate 42 moves toward the insertion hole 21, thereby engaging the engaging teeth 41a with the inner teeth 34. It is to be released.
[0034]
Further, the horizontal plate 43 and the vertical plate 44 are coupled at a substantially right angle, and a curved recess 45 for accommodating the cam 5 is formed in each inner portion of the horizontal plate 43 and the vertical plate 44. Further, at both end portions of the lateral plate 43, contact protrusions 43a that contact the guide protrusions 22a of the guide member 22 are provided, and the contact protrusions 43a contact the guide protrusions 22a, thereby the locking tooth plate. Inclination toward the direction of receiving the load 41 is prevented, so that the locking teeth 41a are always reliably engaged with the internal teeth 34.
[0035]
Further, an engaging projection 44a projecting toward the cam 5 is provided at a substantially central position of the vertical plate 44, and the engaging tooth plate 41 is caused to interfere with the rotating cam 5 by this engaging projection 44a. The guide groove 25 is immersed.
[0036]
In addition, the pair of lock plates 4 are mounted at point-symmetrical positions in the accommodation space 24 around the hole center of the insertion hole 21, and the leading end of one vertical plate 44 is connected to the other horizontal plate 43. The shape is set so as to be in contact with the side end face, and thereby the mounting state of each lock plate 4 in the accommodation space 24 is stabilized.
[0037]
The cam 5 includes a cam body 51 having a substantially elliptical shape, and a pair of pressing protrusions 52 projecting outward from the edge of the point symmetry position of the cam body 51. A hexagonal hole 53 through which the cam shaft 6 is inserted is formed in the central portion of the cam body 51. On the other hand, the camshaft 6 is bridged between the left and right recliners 1 (only one recliner 1 is shown in FIG. 3) across the seat bottom S1, as shown in FIG. Extends to both recliners 1. Specifically, the cam shaft 6 is dimensioned so as to be slidably fitted into the hexagonal hole 53, and the cam 5 of one recliner 1 is rotated by the operation of the operating rod 7. 5 is transmitted to the cam 5 of the other recliner 1 via the cam shaft 6 so that the other cam 5 rotates synchronously with the one cam 5 around its axis.
[0038]
As shown in FIG. 5, the pair of pressing protrusions 52 are provided corresponding to the engaging protrusions 44 a respectively protruding from the vertical plate 44 of each lock plate 4, and are in the state shown in FIG. As the cam 5 rotates clockwise around the cam shaft 6, the pressing projection 52 presses the engaging projection 44 a, whereby the lock plate 4 is engaged with the locking teeth 41 a as shown in FIG. Is located at the unlocking position immersed in the guide groove 25.
[0039]
As shown in FIG. 2, the operation rod 7 includes an L-shaped plate 71 having an L-shape and a handle 72 attached to the tip of the L-shaped plate 71. An insertion hole 73 for inserting the camshaft 6 is formed in the upper end portion of the L-shaped plate 71, and a pair of cut and raised pieces 74 are inserted through the first bracket 2 across the insertion hole 73. While protruding from the hole 21, the cam 5 is provided with a locking hole 54 into which the cut piece 74 is inserted. With the first bracket 2 sandwiched between the cam 5 and the L-shaped plate 71, the operating rod 7 is camshafted by operating the handle 72 by cutting and raising into the locking hole 54 and fitting and locking the piece 74. The cam 5 rotates around the cam shaft 6 by rotating around the 6 axis.
[0040]
The operating rod 7 is configured such that the holding plate 8 is attached to the first bracket 2 with the rivets 76 (in the state where the cut and raised piece 74 is inserted into the insertion hole 21 of the first bracket 2 and inserted into the locking hole 54 of the cam 5. 3), it is prevented from coming off by being caulked, thereby stabilizing the mounting state of the operating rod 7 on the first bracket 2.
[0041]
As shown in FIG. 2, the holding plate 8 includes a plate main body 81 that holds the L-shaped plate 71 of the operating rod 7, and an arc plate 82 that protrudes outward from the upper edge of the plate main body 81. It is made up of. On the rear end of the lower edge of the plate body 81, a spring hooking protrusion 83 is provided so as to protrude from the L-shaped plate 71 of the operation rod 7. , 83, the operating spring 7 is urged counterclockwise around the cam shaft 6 by tensioning the coil spring 84.
[0042]
When the operating rod 7 is biased counterclockwise around the cam shaft 6, the cam 5 also moves counterclockwise around the cam shaft 6 via the cut and raised piece 74 of the operating rod 7. Therefore, the cam 5 is in a state of pressing the lock plate 4 outward in the radial direction from the guide groove 25 of the locking tooth 41a to the outside. Thus, the locking teeth 41a mesh with the inner teeth 34 of the second bracket 3, and the rotation of the second bracket 3 around the cam shaft 6 is normally restricted.
[0043]
By operating the operating rod 7 upward in this state, the cam 5 rotates clockwise around the cam shaft 6, and the locking teeth 41 a are pressed by the pressing of the engaging protrusions 44 a by the pressing protrusions 52 of the cam 5. The engagement with the inner teeth 34 of the locking teeth 41a is released by immersing in the guide groove 25 of the first bracket 2, whereby the tilting posture of the seat back S2 can be arbitrarily set.
[0044]
Further, the holding plate 35 is also provided with a spring hooking protrusion 35a protruding rightward in FIG. 2, and between the spring hooking protrusion 35a and the front edge of the arc plate 82 of the holding plate 8. The spiral spring 10 is mounted on the The spiral spring 10 causes the second bracket 3 to receive a biasing force counterclockwise around the cam shaft 6 via the presser plate 35, so that the seat back S2 is always in a forward-facing posture via the second bracket 3. It is so energized.
[0045]
Hereinafter, the memory plate 9 will be described with reference to FIG. 6 and other drawings as required. FIG. 6 is a perspective view showing an embodiment of the memory plate. The memory plate 9 is interposed between the first bracket 2 and the second bracket 3 (FIG. 2) to form an unlocking region R (FIG. 7) of the lock plate 4.
[0046]
The memory plate 9 is formed by pressing a thin spring material, the inner diameter of the second bracket 3 is set to be approximately the same as the inner diameter of the mounting recess 33 of the second bracket 3, and An annular plate body 91 that is slightly larger than the diameter of the circular convex portion of the first bracket 2 formed by the pair of guide members 22 and the inner surface of the second bracket 3 from the opposing peripheral surface of the inner peripheral edge of the plate body 91. A pair of mask pieces 92 extending so as to cover and mask the teeth 34 (FIG. 2) within a predetermined range, and an operation lever for projecting the plate main body outwardly from the plate main body 93.
[0047]
The mask piece 92 protrudes inward from the inner peripheral surface of the plate body 91 and is connected to the connecting piece 94 bent toward the mounting recess 33 (to the left of the paper surface of FIG. 6). Via the plate body 91. The mask pieces 92 are formed so as to project in opposite directions from both ends in the circumferential direction of the connection piece 94 so as to follow a circular locus centering on the axis of the cam shaft 6. The mask piece 92 forms an unlocking area R that prevents the locking teeth 41 a of the lock plate 4 from engaging the inner teeth 34.
[0048]
In addition, positioning protrusions 92a are formed at both ends of each mask piece 92 so as to protrude outwardly in the radial direction. These positioning protrusions 92a are all provided at positions where they mesh with the inner teeth 34, whereby the positioning protrusions 92a are usually fitted into the inner teeth 34 so that the circumferential setting position of the memory plate 9 is stabilized. When the plate main body 91 is rotated by operating the operation lever 93, the mask piece 92 is elastically deformed toward the inner side in the radial direction of the plate main body 91 when the positioning projection 92a gets over the crest of the inner tooth 34. The force is transmitted to the operation lever 93, and thereby a sense of moderation can be obtained.
[0049]
The positioning protrusion 92a is not limited to a spot-like protrusion as shown in FIG. 6, but is a protrusion extending in the width direction bulging outward in the radial direction over the entire width of the mask piece 92. There may be.
[0050]
The operation of the present invention will be described below with reference to FIGS. FIG. 7 is an explanatory diagram showing a case where the memory plate 9 is positioned so as to obtain a standard first stage position (position where the seat back S2 is locked at the foremost position in the lockable range) T1 of the seat back S2. Yes, (A) shows a state in which the seat back S2 is tilt-locked at the first position, and (B) shows a state in which the seat back S2 is brought down to the foremost position T3. FIG. 8 is an explanatory diagram showing a case where the memory plate 9 is positioned at the adjusted first-stage position T2 so that the first-stage position of the seat back S2 is backward from the standard position. The state in which the seat back S2 is tilted and locked at the first position, and (B) shows the state in which the seat back S2 is tilted to the foremost position T3.
[0051]
First, as shown in FIG. 7A, when the position of the mask piece 92 is set so that the initial position of the seat back S2 becomes the standard initial position T1, the vertical position of the seat back S2 is set. A tilt lock area R1 is set between the rearward position and the rearward position. Therefore, in a state where the locking teeth 41a of the lock plate 4 are located in the tilt lock region R1, the locking teeth are caused by the outward movement of each lock plate 4 in the radial direction by the urging force of the coil spring 84 (FIG. 2). Since 41a meshes with the internal teeth 34 to lock the tilt position of the seat back S2, it is tilted by selecting the tilt position of the seat back S2 while releasing the mesh by operating the operating rod 7, and canceling the operation. The seat back S2 can be locked at an arbitrary tilt position within the lock region R1.
[0052]
When the seat back S2 is moved forward by releasing the lock by operating the operating rod 7 to get on and off the passenger in the rear seat, the second bracket 3 is rotated clockwise around the cam shaft 6 to be locked. As shown in FIG. 7 (b), the teeth 41a come out of the tilt lock region R1 and enter the unlock region R facing the mask piece 92. Therefore, even if the operation of the operation rod 7 is stopped, the locking teeth 41a Is blocked by the mask piece 92 and cannot mesh with the inner teeth 34. Therefore, when the seat back S2 is urged forward by the urging means (not shown), the seat back S2 is in the most forward position. So that the passenger in the rear seat can get on and off.
[0053]
Next, when a force is applied to the seat back S <b> 2 without operating the operation rod 7 when the passenger in the rear seat finishes getting on and off, the locking teeth 41 a of the lock plate 4 are applied to the surface of the mask piece 92. As the seat back S2 rotates clockwise around the cam shaft 6 and the locking teeth 41a enter the tilt lock region R1, the locking teeth 41a are not masked here because the internal teeth 34 are not masked here. The urging force of the coil spring 84 moves in the radial direction and meshes with the inner teeth 34, whereby the seat back S2 is returned to the upright posture at the standard first stage position T1 of the tilt lock region R1 ((A) in FIG. 7).
[0054]
Next, as shown in FIG. 8A, when the plate main body 91 is rotated counterclockwise by a predetermined angle (operation angle) α by the operation of the operation lever 93, the unlock region R and the tilt lock are thereby caused. Both of the areas R1 move around the cam shaft 6 by the operation angle α, and the adjusted first stage position T2 tilted backward is formed. Therefore, after that, the tilt range of the seat back S2 moves backward by the operation angle α. However, the lock and unlock operations of the seat back S2 at the set position and the shift operation to the unlock region R are described. This is the same as described above based on FIG.
[0055]
Then, when the unlocking region R and the tilting locking region R1 are shifted from the steady position shown in FIG. 7A by a predetermined angle α as shown in FIG. For this reason, when the lock plate 4 is returned from the unlocked region R to the tilted locked region R1 after the seat back S2 is tilted to the most forward position (FIG. 8B), The position of meshing with the teeth 34 is changed to an adjusted first stage position T2 ((A) in FIG. 8) that is moved backward by the operation angle α of the operation lever 93 from the normal first stage position S1 shown in FIG. Therefore, the seat back S2 is set at a tilt position corresponding to the adjusted first stage position T2.
[0056]
Therefore, if the first stage position is set in advance according to the seated person's preference by operating the memory plate 9, the seat back S2 is lowered to the foremost position for the passengers in the rear seat to get on and off. By simply returning the seat to the original position, the seated person is locked to the first stage position set according to his / her preference. It is not necessary for the user to perform a troublesome operation for setting the position to the preferred tilt position, and the operability of the recliner 1 is improved accordingly.
[0057]
【The invention's effect】
According to the first aspect of the present invention, the memory plate is provided between the first and second brackets to mask the internal teeth and prevent the lock plate from engaging with the internal teeth, and the memory plate is connected to the annular plate body. A pair of mask pieces extending so as to mask the internal teeth of the circular recess from the opposing peripheral surface of the plate body within a predetermined range, and a rotation of the plate body projecting outward from the plate body. Since it is composed of an operation lever for dynamic operation, the mask position of the internal teeth by the mask piece provided on the plate body can be changed by rotating the memory plate by rotating the operation lever around the rotation center. Can do.
[0058]
Then, by changing the mask position of the internal teeth by the mask piece, the meshing position of the lock plate with respect to the internal teeth is changed, and thereby the lockable position of the tilted posture of the seat back can be changed. That is, a so-called lock-free position of the seat back can be stored in the memory plate.
[0059]
As described above, since the lockable position of the seat back can be arbitrarily changed by rotating the plate body, the selection range of the tilt position of the seat back is expanded, and the seat back more suitable for the situation is used. Can be reproduced immediately.
[0060]
According to the second aspect of the present invention, since the plate body is provided with the operation lever for rotating the plate body projecting outward, the plate body is rotated by operating the operation lever. Therefore, the mask piece position setting operation can be easily performed.
[0061]
According to the third aspect of the present invention, the masking piece is provided with the positioning projection that is detachably engaged with the internal teeth by elastic deformation, so that the positioning projection is the second by rotating the memory plate by operating the operation lever. Since it is engaged with and disengaged from the internal teeth of the bracket, a feeling of moderation can be obtained by the response at this time, and the amount of rotation of the memory plate can be realized.
[0062]
In addition, since the rotation position of the memory plate once set is maintained by the positioning protrusion meshing with the inner teeth, the lock plate can be moved by tilting the seat back unless the operation lever is operated with force. The inconvenience that the memory plate rotates together with the rotation is avoided, and the lock-free range once set can be securely held.
[Brief description of the drawings]
FIG. 1 is a side view illustrating an embodiment of a reclining seat to which a recliner structure of the present invention is applied.
FIG. 2 is a partially cutaway exploded perspective view showing an embodiment of a recliner.
3 is an assembled perspective view of the recliner shown in FIG. 2. FIG.
4 is a perspective view of the X-ray view and the Y-ray view of FIG. 2;
FIGS. 5A and 5B are front views showing an embodiment of the lock plate, where FIG. 5A is a state in which the locking teeth of the lock plate protrude outward from the guide groove, and FIG. 5B is a state in which the locking teeth are immersed in the guide groove. Each state is shown.
FIG. 6 is a perspective view showing an embodiment of a memory plate.
FIG. 7 is an explanatory diagram for explaining the operation of the present invention, and shows a case where the memory plate is positioned so that a standard first-stage position of the seat back is obtained; The state in which the tilt is locked, (B) shows the state in which the seat back is brought down to the most forward position.
FIG. 8 is an explanatory diagram for explaining the operation of the present invention, and shows a case where the memory plate is positioned so that the initial position of the seat back is on the backward side from the standard one; The state where the seat back is tilted and locked at the first position, and (B) shows the state where the seat back is tilted to the most forward position.
[Explanation of symbols]
2 First bracket
3 Second bracket
25 Guide groove
4 Lock plate
41 Locking tooth plate
41a Locking teeth
42 vertical plate
44a Locking protrusion
45 Curved recess
5 cams
51b Second arc edge
6 Camshaft
7 Operation
8 Holding plate
9 Memory plate
91 Plate body
92 Mask pieces
92a Positioning protrusion

Claims (3)

A first bracket fixed to one of the seat bottom and the seat back; a second bracket fixed to the other and connected to the first bracket so as to be capable of relative rotation about a rotation center; and first and second A cam that is interposed between the brackets and rotates about the rotation center by the operation of the operation rod, and a lock plate that protrudes and projects in the radial direction between the first and second brackets in conjunction with the forward and reverse rotation of the cam. The first bracket is fitted with a lock plate, and the circumferential surface has a circular convex portion along a circular locus around the rotation center, and the lock plate is recessed and raised in the circular convex portion. While the guide groove for guiding is provided, the second bracket engages with the circular concave portion into which the circular convex portion is fitted in the sliding contact state and the locking tooth at the tip of the lock plate protruding from the guide groove. Recessed In the seat recliner structure, provided with internal teeth formed on a peripheral surface, and provided with biasing means for biasing the cam around a support shaft so that the lock plate protrudes from the guide groove, A memory plate is interposed between the first and second brackets to mask the inner teeth and prevent engagement of the lock plate with the inner teeth. The memory plate has an annular plate body and an opposing plate body. A pair of mask pieces extending from the peripheral surface and interposed between the inner teeth of the circular recesses and the circular protrusions so as to mask the inner teeth within a predetermined range. The characteristic seat recliner structure. 2. The seat recliner structure according to claim 1, wherein the plate body is provided with an operation lever for rotating the plate body projecting outward. 3. The sheet recliner structure according to claim 1, wherein the mask piece has a positioning protrusion that is detachably engaged with the internal teeth by elastic deformation.

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