JP6540970B2 - Vehicle seat - Google Patents

Description

  According to the present invention, a vehicle seat, in particular a seat cushion, has a cushion body and a movable side portion provided on the side of the seat surface of the cushion body, and the movable side portion stands on the cushion body. The present invention relates to a vehicle seat supported so as to be movable between the upright position and the inclined position which is inclined from the upright position.

  As the vehicle seat, for example, a standup holding lock that can be switched between a lock operation state in which the movable side portion is locked in the upright position and the tilt position respectively between the cushion body and the movable side portion and a lock release state in which the lock is released. There is known a car seat provided with a mechanism and a locking mechanism for tilting and holding (see Patent Document 1 below).

  In this conventional automobile seat, the movable side portion of the seat cushion is normally locked in the upright position so that the holdability of the occupant can be favorably maintained, while the occupant is on the seat cushion on the entrance side. When moving away from the vehicle by laterally moving, the lock mechanism for standing up holding is unlocked, and the movable side unit in the standing state is manually tilted to prevent the movable side unit from getting in the way of getting off.

Japanese Patent Application Laid-Open No. 10-86706

  In the above-described seat for an automobile, when the occupant tries to get off with the movable side portion locked in the upright position, an operation for unlocking the upright holding lock mechanism, and manually tilting the movable side portion in the upright state Since it is necessary to sequentially perform the operations to be performed individually, it takes time and effort as a whole, and there is a problem such as causing trouble for the passenger to get off quickly.

  The present invention has been proposed in view of the above, and it is an object of the present invention to provide a vehicle seat capable of solving the conventional problems with a simple structure.

In order to achieve the above object, according to the present invention, the seat cushion has a cushion body and a movable side portion provided on the side of the seat surface of the cushion body, and the movable side portion is the cushion body In the vehicle seat supported so as to be able to move between the upright position standing up against and the inclined position tilted from the upright position, the operation input portion capable of arbitrary operation input , the cushion main body and the movable side portion And a lock mechanism capable of switching the movable side portion to a lock operating state capable of locking the movable side portion to the upright position and an unlockable unlocked state, and biasing the movable side portion to the upright position side. Biasing means, a holding member for holding the lock mechanism in the lock operating state, and an operating state interlockingly with the operation input unit being operated and input A lock release holding mechanism that allows the lock mechanism to automatically return to the lock operation state when the lock mechanism is in the lock release state during operation, and the lock release hold mechanism is in the operation state and a return mechanism switches the lock release retaining mechanism inoperative in response to the tilting of the movable side part when in said movable side part, in a state where the movable side part is held in the standing position After the operation input unit is operated and input , the movable side portion is tilted from the standing position in response to a predetermined downward load acting on the movable side portion, and the lock release holding mechanism is pivotally supported by the movable side portion. And is connected to the lock mechanism to allow the lock mechanism to automatically return to the lock operation state. And the return mechanism is responsive to the movable side portion being tilted when the lock release retaining member is in the actuated position. Te and that you have a returning member forces rotate to the unlocking holding member and the inoperative position of the lock release retaining member abuts the first feature.

Further, according to the present invention, the seat cushion has a cushion main body and a movable side portion provided on the side of the seat surface of the cushion main body, and the movable side portion in the cushion main body stands up with respect to the cushion main body A vehicle seat supported so as to be movable between an upright position and an inclined position inclined from the upright position, provided between an operation input portion capable of arbitrary operation input and the cushion main body and the movable side portion; A lock mechanism capable of switching between a lock operating state capable of locking the side portion to the upright position and an unlocked state not lockable, biasing means for biasing the movable side portion toward the upright position, and the lock mechanism A holding member for holding the lock in the lock operation state, and the operation input unit is operated in conjunction with the operation input being operated, and at the time of operation And a lock release holding mechanism for allowing the lock mechanism to automatically return to the lock operation state when the lock mechanism is not operated, and the movable side portion includes the movable side portion After the operation input unit is operated and input while held in the upright position, the movable side portion tilts from the upright position in response to a predetermined downward load acting on the movable side portion, and the lock mechanism A latch provided with a locking groove provided on either one of the main body and the movable side portion, and a lock member provided on either one of the other and capable of engaging and disengaging with the locking groove, the lock member being engaged When locked in the locking groove, the lock is activated, and when the lock of the lock member is released in response to the operation input to the operation input unit, the lock is released, and the lock is released. The lock release holding mechanism includes a lock release holding member that is activated in response to an operation input to the operation input unit in a state where the movable side unit is locked in the upright position by the lock mechanism. unlocking the holding member, the entry into the locking groove of the locking member, and a Rukoto to adjust the engagement lock member to prevent the locking second feature is in this operating state.

Or the present invention, in addition to the first feature, the lock release retaining mechanism is in the first operating position when said locking mechanism is consolidated in the locking mechanism is in the locked operating state and the unlocked position And the lock release holding member is configured to engage the engaged portion of the link mechanism when in the first operation position. A third feature is to have an engaging portion and a second engaging portion for engaging the engaged portion of the link mechanism when in the second operating position.

Further, according to the present invention, in addition to the third feature, a guide portion for guiding the engaged portion to move from one of the first and second engaging portions to the other on the lock release holding member. The fourth feature is the provision of

Further, according to the present invention, in addition to the fourth feature, the lock release holding member can hold an engagement state of the first and second engagement portions with the engaged portion. And a holding spring for biasing the lock release holding member is connected, and the guide portion guides the guide portion while the engaged portion moves from one of the first and second engagement portions to the other. In the second embodiment, the biasing state of the holding spring is engaged with one of the first and second engaging portions and the other is engaged with the other of the first and second engaging portions. A fifth feature is to have a switching top for switching to a mode of engaging and holding the part.

In the present invention, in addition to the fifth feature, a holding spring is disposed on one side of a vertical plane passing through a pivot axis with respect to the movable side portion of the lock release holding member, and the fourth on the other side. According to a sixth aspect of the present invention, the first engaging portion and the guide portion are disposed.

Further, in addition to the second feature, the present invention is a return mechanism that switches the lock release holding mechanism to a non-operation state according to the tilting of the movable side portion when the lock release holding mechanism is in an operation state. A seventh feature is the provision.

The present invention, in addition to the second or seventh aspect, the unlocking holding member and eighth feature of that is disposed adjacent to the latch.

Further, according to the present invention, in addition to any one of the second, seventh, and eighth features, the lock release holding member is configured to prevent the lock member from entering and locking in the locking groove. It is movable between an operating position capable of engaging with a lock member and an inoperative position permitting entry and locking, and when the movable side portion returns to the upright position after the tilting, A ninth feature is that the lock release holding member is moved from the operating position to the inoperative position in conjunction with the lock member.

Further, in the present invention, in addition to the ninth feature, a return spring capable of resiliently holding the lock release holding member in the operation position is connected to the lock release holding member, and the lock member is connected to the locking groove. In the locked state, the lock release holding member is engaged with the lock release holding member so as to hold the lock release holding member in the inoperative position against the elastic force of the return spring, and in the engagement state, the operation input unit In conjunction with the operation input, the lock member unlocks the lock groove and releases the lock release holding member, and the lock release holding member is moved from the inoperative position to the operating position It is permitted to move by the elastic force of the return spring, and the lock release holding member is resistant to the elastic force of the return spring in the process that the movable side portion tilts from the upright position and returns to the upright position again. From the working position Serial so as to force moved to the inoperative position, the interlocking mechanism to coordinate the unlock holding member so as to be relatively slidable in the locking member to the tenth aspect in that provided between the locking member and the unlocking holding member.

Further, according to the present invention, in addition to any one of the first to tenth features, after the movable side portion is tilted from the standing position, the downward load acting on the movable side portion is reduced to a predetermined value or less. An eleventh feature of the present invention is to automatically return to the upright position and to be in a locked state in accordance with the above.

Further, in the present invention, in addition to any of the first to eleventh features, a twelfth feature is that the movable side portion is inclined further downward than the horizontal position when in the inclined position. .

Furthermore, in addition to the first or second feature, the present invention couples a side frame, which is a component separate from the cushion frame, to a cushion frame serving as a framework of the cushion main body, and The movable side portion is rotatably supported between the erected position and the inclining position, and a lock mechanism capable of locking the movable side portion in the erected position is provided between the side frame and the movable side portion. 13 features.

In the present invention, in addition to the thirteenth feature, at least a part of the cushion frame is constituted by a wire-like frame, and the side frame is a portion of the wire-like frame exposed from the cushion body outer surface. A fourteenth feature is to be fastened.

Further, according to the present invention, in addition to the thirteenth or fourteenth feature, a support wall portion for supporting a pivot support portion of the movable side portion to the side frame is integrally erected on the side frame, and the cushion A fifteenth feature is that the support wall portion is fastened to a portion of the frame exposed from the cushion body outer surface.

In addition to the fifteenth feature, the present invention has a sixteenth feature in which at least a part of the support wall functions as a pad position restricting portion that abuts on a pad portion of the cushion main body.

Further, in the present invention, in addition to the fifteenth or sixteenth feature, the cushion frame is offset from the bottom plate frame of the movable side portion to the vehicle front side or the rear side with respect to the mounting wall portion connected to the support wall portion. A seventeenth feature is to be fastened at a fixed position.

Further, according to the present invention, in addition to any one of the fifteenth to seventeenth features, the movable side portion and the movable side portion are attached to the support wall portion and pivoted together with the movable side portion. An eighteenth feature is that a relief is formed to avoid interference with the member.

Further, according to the present invention, in addition to any of the fifteenth to eighteenth features, the support wall portion has at least an enclosure wall portion surrounding a pivot support portion of the movable side portion to the side frame. As the nineteenth feature.

The present invention, in addition to the features of the nineteenth, wherein the enclosing wall portion of the support wall portion, and first 20, characterized in that it is housed in a recess formed on the outer portion of the pad portion of the cushion body .

Further, according to the present invention, in addition to any one of the first, third to sixth features, a cushion frame serving as a framework of the cushion main body is coupled to a side frame which is a separate part from the cushion frame. A lock mechanism which supports the movable side portion on the side frame so as to be pivotable between an upright position and an inclined position, and can lock the movable side portion in the upright position between the side frame and the movable side portion. A twenty-first feature of the present invention is that the return member projects from the side frame.

Further, in addition to the thirteenth feature, the present invention is characterized in that at least a part of the cushion frame is constituted by a wire-like frame, and the wire-like frame has a plate-like side at a portion exposed from the cushion body outer surface. A twenty-second feature is that a frame attachment member is coupled, and the side frame is attached to the wire-like frame via the side frame attachment member.

The present invention, in addition to the features of the first 22, wherein the lower portion of the side frame mounting member, that the side frame support member capable of supporting a portion of the load from the side frame is arranged in the first 23 It features.

The present invention, in addition to the features of claim 23, wherein the side frame mounting member and the second 24, characterized in that it is sandwiched between the side frame support member and the side frame.

According to the first and second features of the present invention, after the operation input unit is operated and input while the movable side portion is held in the upright position, a predetermined downward load acts on the movable side portion. Since the mobile side tilts from the upright position according to the operation, after the operation input unit is operated and input, the movable side portion is held in the upright position in a state where it can be tilted at any time even if the hand is released from the operation input unit Since the movable side portion does not need to be specially tilted to tilt the movable side portion from that state, operability as a whole is excellent. That is, when the occupant sitting on the cushion body tries to get off, the movable side portion can be automatically tilted by the weight of the occupant simply by performing the operation input on the operation input unit, so that the operability can be improved. Accordingly, it is possible to avoid that the movable side portion becomes an obstacle to the getting-off operation of the occupant, so that the occupant can be dismounted quickly and easily without being disturbed by the movable side portion.

In addition, normally, by holding the movable side portion in the upright position by the lock mechanism, the holdability of the occupant can be kept good, and from this state, the lock release holding mechanism is operated based on the operation input to the operation input portion. It can be operated to switch and hold the lock mechanism in the unlocked state. Even in this unlocking holding state, the movable side portion can be temporarily held in the upright position by the biasing means, but when the occupant on the cushion main body tries to move laterally from this state, the movable side portion is the weight of the occupant. It can be made to tilt without force against the biasing means.

Moreover, according to the first feature of the present invention, the return mechanism switches the lock release holding mechanism to the inoperative state according to the tilting of the movable side portion, so that the occupant weight is released after the end of the lateral movement of the occupant. The movable side portion is automatically elevated by the biasing means, and the lock mechanism is in the lock operation state when the movable side portion reaches the upright position, so that the movable side portion can be automatically returned to the upright position and held. , The operability is good as a whole. Further, since the tilt holding lock mechanism for locking the movable side portion in the tilt position can be omitted, the structure can be simplified accordingly. Also, when tilting the movable side portion from the upright position according to the lateral movement of the occupant, only by mechanically engaging the unlocking holding member of the unlocking holding mechanism in the operating state and the return member of the returning mechanism. Since the lock release holding mechanism can be mechanically interlocked with the tilting operation of the movable side portion and switched to the non-operation state, the switching structure is simple.

Further, according to the second feature of the present invention, the lock release holding member engages with the lock member so as to block the lock member from entering into the locking groove and locking in the operating state thereof. The lock release holding member can be directly linked to each other, the structure of the lock release holding member can be simplified and miniaturized, and an increase in the size of the lock release holding mechanism can be effectively suppressed.

According to a third aspect of the or invention, the lock release retaining mechanism, the engaged portion of the interlocking linked linkage to the lock mechanism, the first unlocking the holding members of the same mechanism, the second engagement The lock release holding mechanism can be properly held in the operating state and the non-operating state, respectively, by a simple configuration in which the parts are selectively engaged.

According to a fourth feature of the present invention, the lock release holding member includes a guide portion for guiding the engaged portion of the link mechanism to move from one of the first and second engaging portions to the other. Since it is provided, the lock release holding mechanism can be switched smoothly and smoothly between the operating state and the non-operating state.

Further, according to the fifth feature of the present invention, it is possible to hold the engagement state of the first and second engaging portions with the engaged portions of the first and second engaging portions respectively with a single holding spring, and therefore, with a simple structure. The lock release holding mechanism can be properly held in the actuated state and the non-actuated state, respectively.

According to a sixth aspect of the present invention, the holding spring is disposed on one side of a vertical plane passing through the pivot axis with respect to the movable side portion of the lock release holding member, and the first and second springs on the other side. Since the engaging portion and the guide portion are respectively disposed, the lock release holding mechanism can be made compact while avoiding mutual interference between the holding spring and the link mechanism without difficulty.

Further, according to the seventh aspect of the present invention, the return mechanism switches the lock release holding mechanism to the inoperative state according to the tilting of the movable side portion, so that the occupant weight is released after the end of the lateral movement. The movable side portion is automatically elevated by the biasing means, and the lock mechanism is in the lock operation state when the movable side portion reaches the upright position, so that the movable side portion can be automatically returned to the upright position and held. , The operability is good as a whole. Further, since the tilt holding lock mechanism for locking the movable side portion in the tilt position can be omitted, the structure can be simplified accordingly.

According to the eighth feature of the present invention, by arranging the lock release holding member adjacent to the latch of the lock mechanism, the holding force of the lock release holding member can be efficiently transmitted to the lock member, and The structure can be simplified and miniaturized.

Further, according to a ninth aspect of the present invention, the lock release holding member is capable of engaging with the lock member so as to block the lock member from entering into the locking groove, and the entry, engagement. The lock release member is interlocked with the lock member and movable from the operating position to the inoperative position when the movable side portion is movable between the inoperative position and the movable side portion is returned to the upright position after the tilting. The lock release holding member can be automatically returned to the inoperative position by a simple interlocking structure using the lock member when the inclined movable side portion returns to the upright position.

According to a tenth aspect of the present invention, the lock member holds the lock release holding member in the inoperative position against the elastic force of the return spring when the lock member is locked in the lock groove of the latch. Since the lock is engaged with the lock release holding member, the movable side portion can be normally locked in the upright position without being disturbed by the lock release holding member. Further, interlocking with the operation input unit being operated and input in the locked state, the lock member releases the lock on the locking groove and releases the lock release holding member, whereby the lock release holding member Since it moves from the inoperative position to the operative position by the elastic force of the return spring, the unlocked state can be easily obtained according to the operation input to the operation input unit. Further, in the process in which the movable side portion tilts from the upright position and returns to the upright position again, the interlocking mechanism linking the lock release holding member to the lock member so as to be relatively slidable causes the lock release holding member to be the resilient force of the return spring. It can be forcedly moved from the operative position to the inoperative position. As a result, even if the lock release holding member has a simple arrangement structure independent from the transmission path between the operation input portion and the lock mechanism, the lock release holding member is linked to the lock member and thus the operating position is not Since the switching operation between the operating positions can be properly performed, further simplification and downsizing of the lock release holding mechanism can be achieved.

Further, according to an eleventh feature of the present invention, after the movable side portion is tilted from the standing position, the movable side portion automatically returns to the standing position according to the downward load acting on the movable side portion being reduced to a predetermined value or less. Since the locked state is obtained, the movable side portion can be automatically returned to the upright position according to the separation of the occupant from the above after the tilting of the movable side portion, and the operability is further improved.

Further, according to a thirteenth feature of the present invention, the movable side portion can be assembled together with the lock mechanism etc. on a side frame which is a separate part from the cushion frame which is a skeleton of the cushion main body. It can be handled as a subassembly, ie, a subassembly. As a result, not only the cushion frame on the cushion body side can be miniaturized, but the movable side portion can be easily and quickly made to the cushion body simply by simply connecting the side frame of the above-described small assembly assembled in advance to the cushion frame. It can be assembled and can greatly contribute to the improvement of productivity. In addition, even when changing the shape, size, etc. of the movable side part by model change etc., it is only necessary to change the side frame which is a small part, and it is unnecessary or slight to change the cushion main body (cushion frame) which is a large part. It is possible to suppress such changes, and the response is easy.

Further, according to a fourteenth feature of the present invention, at least a part of the cushion frame is constituted by a wire-like frame, and the side frame is fastened to a portion of the wire-like frame exposed from the cushion body outer surface. By the wire-like frame having excellent formability, the side frame fastening portion in the cushion frame can be easily formed, and also the selection freedom of the forming position can be enhanced.

Further, according to a fifteenth feature of the present invention, the support wall portion for supporting the pivotally supporting portion of the movable side portion to the side frame is integrally erected on the side frame and exposed from the cushion body outer surface of the cushion frame. Since the support wall portion is fastened to the portion, the support wall portion for supporting the pivotal support portion of the movable side portion also serves as a fastening portion on the side of the side frame with respect to the cushion frame, thereby simplifying the structure.

Further, according to a sixteenth feature of the present invention, at least a portion of the support wall functions as a pad position restricting portion that abuts on the pad portion of the cushion main body, so the support wall supporting the pivot portion of the movable side portion The part also serves as the pad regulation means, and the structure can be simplified accordingly.

Further, according to a seventeenth feature of the present invention, the cushion frame is fastened to the mounting wall portion continuously provided to the support wall portion at a position offset to the vehicle front side or rear side with respect to the bottom plate frame of the movable side portion. In performing the work of fastening the side frame to the cushion frame at the fastening portion, the movable side portion can be effectively prevented from becoming an obstacle, and the workability can be enhanced.

Further, according to an eighteenth feature of the present invention, the support wall portion has a movable side portion and a relief portion attached to the movable side portion to avoid interference with a member rotating together with the movable side portion. Since it is formed, when moving the movable side portion, interference with the support wall portion can be suppressed.

Further, according to a nineteenth feature of the present invention, since the support wall portion has an enclosure wall portion surrounding the shaft support portion to the side frame of the movable side portion, the shaft support portion is effectively reinforced by the enclosure wall portion And can be protected.

Further, according to a twentieth feature of the present invention, since the surrounding wall portion of the support wall portion is accommodated in the recess formed in the outer side portion of the pad portion of the cushion main body, the support wall portion is the outer side of the cushion main body. This can contribute to the compactness of the sheet by avoiding the large overhang.

Further, according to the twenty-first feature of the present invention, since the return member is protruded on the side frame, the mechanism for automatically switching the lock release holding mechanism to the non-operating state can be simplified, and the cost can be reduced. It can contribute to saving.

Further, according to a twenty-second feature of the present invention, a plate-like side frame attachment member is coupled to a portion of the wire-like frame forming a part of the cushion frame exposed from the outer surface of the cushion main body. Since the side frame is attached to the wire-like frame, the side frame is easier to attach than when it is directly attached to the narrow and meandered wire-like frame, and the design freedom of the side frame and the wire-like frame is also Get higher.

Further, according to the twenty- third feature of the present invention, the side frame supporting member capable of supporting a part of the load from the side frame is disposed below the side frame mounting member, so that the side frame can be enlarged. The support strength of the side frame can be increased while suppressing.

Further, according to the twenty-fourth feature of the present invention, since the side frame attachment member is held between the side frame and the side frame support member, the support strength of the side frame can be increased while simplifying the support structure for the side frame. It can be enhanced.

FIG. 1 is a perspective view of an essential part of an automobile seat to which the present invention is applied, wherein (A) shows the movable side in the upright position and (B) separates the movable side from the cushion main body. It is a figure which shows the state which fractured a part of cushion main part, respectively. First Embodiment FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. First Embodiment FIG. 3 is a partially broken side view seen from the arrow 3 in FIG. First Embodiment FIG. 4 is a bottom view as viewed from the arrow 4 in FIG. First Embodiment FIG. 5 is a longitudinal sectional view (cross section along line 5-5 of FIG. 4) of the lock mechanism with the movable side portion in the upright position, wherein (A) shows a locked state and (B) shows a lock It is a figure which shows a cancellation | release state, respectively. First Embodiment FIG. 6 is an exploded perspective view of the main part of the lock mechanism as viewed obliquely from above. First Embodiment FIG. 7 is an explanatory view of the operation of the lock release holding mechanism, in which (A) shows the non-operation state of the lock release holding mechanism, and (B) shows the switch from the non-operation state to the operation state of the lock release holding mechanism. A state is shown and (C) is a figure which shows the action | operation state of a lock release holding mechanism. First Embodiment FIG. 8 is an operation explanatory view corresponding to FIG. 2 showing the relationship between the operation of the movable side portion and the lock mechanism and the lock release holding mechanism, wherein (A) shows the lock operating state of the lock mechanism (lock release holding mechanism (B) operates the lock release holding mechanism while the movable side part is in the upright position to unlock the lock mechanism, and (C) slightly tilts the movable side part from the upright position. It is a figure which each shows a slightly inverted state (lock release holding | maintenance mechanism remains in operation state). First Embodiment FIG. 9 is an operation explanatory view corresponding to FIG. 2 showing the relationship between the operation of the movable side portion and the lock mechanism and the lock release holding mechanism, wherein (D) further tilts the movable side portion from the slightly inverted position (E) shows that the movable side part is further tilted while the unlocking holding mechanism is in the inoperative state, and (F) shows the state from the weight of the occupant. It is a figure which each shows the state (unlocking holding | maintenance mechanism remained in the non-operating state) which the movable side part open | released returned automatically to the standing-up position. First Embodiment FIG. 10 is a perspective view (corresponding to FIG. 1) of an essential part of a car seat to which the present invention is applied, wherein (A) shows the movable side in the upright position, and (B) shows the movable side. It is a figure which shows the state which fractured a part of cushion body while separating from a cushion body, respectively. Second Embodiment FIG. 11 is an exploded perspective view of the movable side portion of the automobile seat. Second Embodiment 12 is an enlarged sectional view taken along line 12-12 of FIG. 10 (A) corresponding to FIG. Second Embodiment FIG. 13 is a partially cutaway side view corresponding to FIG. 3 as viewed from the arrow 13 in FIG. Second Embodiment 14 is an enlarged sectional view taken along line 14-14 of FIG. 13 corresponding to FIG. 4 and showing a state in which the operation lever is in the non-operation position and the lock mechanism is in the lock operation state. Second Embodiment 15 is an enlarged cross-sectional view taken along line 14-14 of FIG. 13 corresponding to FIG. 4 and showing a state in which the operating lever is in the operating position and the lock mechanism is in the unlocking holding state. Second Embodiment 16 is an enlarged cross-sectional view taken along line 16-16 of FIG. Second Embodiment FIG. 17 is an enlarged cross-sectional view taken along line 17-17 of FIG. Second Embodiment FIG. 18 is an exploded perspective view of main parts of the lock mechanism and the lock release holding mechanism as viewed obliquely from below. Second Embodiment FIG. 19 is a cross-sectional view corresponding to FIG. 17. (A) shows a state immediately after the operation input of the operation lever is started in the lock operation state of the lock mechanism (state of FIG. 17); It is a figure which shows the state in which the lock release holding | maintenance mechanism was in the operation state according to operation input. Second Embodiment FIG. 20 is a cross-sectional view corresponding to FIG. 17, and (C) shows a state where the movable side portion is slightly inclined from the state of FIG. 19 (B) and the lock release holding mechanism is inactivated; ) Is a view showing a state in which the movable side portion is further tilted to reach the tilted position. Second Embodiment FIG. 21 is a cross-sectional view corresponding to FIG. 17, in which (E) shows a state in which the unlocking holding member is slightly lifted by the upper surface of the lock member and pivoted upward by the pivoting of the movable side portion after tilting; (F) is a figure which shows the state which the locking member of the locking mechanism began to lock to a locking groove by a movable side part standing up and rotating from the state of (E). Second Embodiment FIG. 22 is a partial correspondence view of FIG. 13 showing a modification of the return spring with respect to the operation lever. Second Embodiment

A: Seat D: Tilting position L: Lock mechanism LL, LL ′: Unlock release holding mechanism S: Seat cushion Sm: Cushion body Ss: ... Movable side part R ... ... return mechanism R '... ... interlocking mechanism (return mechanism)
U ..... standing position W ----- support wall 1 ..... cushion body for cushion pad (pad section)
1a · · · · recess 5 ----- wire-like frame 5a, 5b, 5c · · wire-shaped frame exposed portion 6f · · · · front wall (a part of the support wall portion, enclosing wall portion)
6 m ・ ・ ・ ・ Intermediate wall (part of support wall, enclosure wall)
6r · · · · · · Back wall (part of support wall, enclosure wall)
6 rw ····· Mounting wall 6 fk, 6 rk · · · Relief portion 7 r '· · · Rear latch (latch)
8 ・ ・ ・ Pivot (axis support)
10 ・ ・ ・ Return spring (biasing means)
13 · · · Locking member 14 · · · Locking groove 15 · · · Locking spring (holding member)
31, 31 '· · · Lock release holding member 33 · · · Link mechanism 34 · · · Operation lever (operation input portion)
35 · · · Holding spring 36a · · · First engaging portion 36b · · · Second engaging portion 36g · · · Guide portion 36 gt · · · Switching top portion 39 · · · · Switching holding pin (engaged portion)
50 · · · · Return member 8 · · · pivot (axial support)
50: Return member 70: Side frame attachment member 71: Side frame support member 96: Return spring

  Next, embodiments of the present invention will be described based on the embodiments shown in the attached drawings. In the present specification, front, rear, left, and right refer to a four-wheeled vehicle as a vehicle to which the present invention is applied.

First embodiment

  First, in FIG. 1, a seat A according to the first embodiment is a rear seat for three occupants installed on a floor of a four-wheeled vehicle, and includes a seat cushion S for seating the buttocks of the occupant and the seat cushion It comprises: a seat back SB which stands upward from the rear end of the seat S and supports the back of the occupant.

With reference to FIGS. 2 to 5 together, the seat cushion S is disposed on the cushion body Sm whose upper surface is a seat surface, and on the side of the seat surface of the cushion body Sm (in the illustrated example, on the left and right landing side) The movable side portion Ss is divided into a pair of left and right movable side portions Ss, and each movable side portion Ss is inclined from the standing position U where the movable side portion Ss stands up from the cushion main body Sm and the standing position U It is mounted so as to be movable relative to the tilting position D, respectively. In the illustrated example, the movable side portion Ss is inclined further downward than the horizontal position when in the inclined position D. Further, between the cushion main body Sm and the movable side portion Ss, there is provided a lock mechanism L which can be switched between a lock operating state capable of locking the movable side portion Ss to the erected position U and an unlocked state not lockable.

  In the illustrated example, the movable side portion Ss is illustrated as being raised upward with respect to the cushion main body Sm when the movable side portion Ss is at the standing position U, but in the present invention, the movable side portion Ss is the standing position. When it is in U, it does not necessarily have to be protruded upward from the cushion main body Sm, and may be, for example, substantially the same height as the cushion main body Sm.

  The cushion body Sm is composed of a cushion frame Fm which is a skeleton of the cushion body, and a cushion body cushion pad 1 as a pad portion supported by the cushion frame Fm, and the surface of the cushion pad 1 is leather or synthetic It is covered with a leather skin 2. Further, side frames Fs, which are parts separate from the cushion frame Fm, are coupled to the left and right end portions of the cushion frame Fm, and movable side portions Ss located above the side frame Fs are rotated Mounted as movable.

The cushion frame Fm includes a plate-like frame (not shown) and a wire-like frame 5 coupled to the plate-like frame. The wire-like frame 5 is a rigid frame formed by bending a bar-like metal frame over a substantially entire area of the cushion main body Sm into a predetermined shape corresponding to the contour form. Be buried. Further, a part of the wire-like frame 5 is exposed from the left and right side surfaces of the cushion main body Sm, and the side frame Fs is detachably fastened to the exposed portions 5a and 5b. As described above, by forming at least a part of the cushion frame Fm with the wire-like frame 5 and fastening the side frame Fs to the portions 5a and 5b of the wire-like frame 5 exposed from the outer surface of the cushion body, The wire-shaped frame 5 has an advantage that the side frame fastening portion in the cushion frame Fm can be easily formed, and the selection freedom of the formation position can also be enhanced.

  Further, the movable side portion Ss is provided with a bottom plate frame B constituting a bottom wall of the movable side portion Ss and a cushion pad 3 for movable side portion fixedly supported on the bottom plate frame B. A reinforcing frame (not shown) which is a framework of the movable side portion Ss in cooperation with the bottom plate frame B is embedded. The surface of the cushion pad 3 is covered with a skin 4 made of leather or synthetic leather.

  The bottom plate frame B includes a bottom plate frame main body Bm consisting of a substantially triangular single plate corresponding to the bottom shape of the movable side portion Ss, and a substantially rectangular lock mechanism supported by welding onto the lower surface of the bottom plate frame main body Bm. It comprises a frame Bl. The lock mechanism support frame B1 has a two-piece structure including an upper frame plate 20 in which a downward flange portion 20f is integrally connected to the outer periphery and a lower frame plate 21 which is welded onto the lower surface of the upper frame plate 20. Configured

  In the side frame Fs, a bottom plate frame B of the movable side portion Ss is pivotally supported via a pivot 8 so that the movable side portion Ss can pivot between the standing position U and the tilting position D. The structure of the shaft support will now be described.

  That is, on the upper surface of the side frame Fs, a substantially U-shaped support wall portion W is integrally erected in a plan view including the front and rear walls 6f and 6r and the intermediate wall 6m connecting the two integrally. The front and rear hinge walls 7f and 7r parallel to each other are integrally protruded from the middle wall 6m. The pivot shaft 8 is fixedly installed between the front and rear hinge walls 7f and 7r, and the pivot shaft 8 is the bottom plate frame B (in particular, upper and lower frame plates 20 and 21 constituting the lock mechanism support frame Bl). The bearing collar 22 is rotatably fitted and coupled to the extension plates 20a and 21a extending integrally from the side edge of the cushion body Sm. In the upper and lower frame plates 20 and 21, shallow ridges 23 for reinforcement are formed, which extend across the area of the extension plates 20a and 21a and the other area.

  Thus, the support wall portion W has an enclosure wall portion including the front and rear walls 6f, 6r and the intermediate wall 6m, which surrounds the side frame Fs pivoting portion of the movable side portion Ss. The bearing portion can be effectively reinforced and protected by the surrounding wall portions 6f, 6m and 6r. Moreover, the enclosure walls 6f, 6m, 6r are accommodated in the recess 1a of the lower surface opening formed on the outer surface of the cushion pad 1 of the cushion body Sm in the illustrated example, whereby the support wall W is the cushion body. The sheet S can be made compact by avoiding a large overhang of Sm on the outer side. In this case, at least a part of the surrounding wall portions 6f, 6m, 6r of the support wall portion W functions as a pad position regulating portion that abuts on the cushion pad 1 of the cushion main body Sm. The support wall portion W supporting the support portion also serves as the pad control means, and the structure can be simplified accordingly.

Furthermore, on a part of the support wall W (for example, the front and rear walls 6f and 6r of the enclosure wall), the movable side portion Ss
In addition, notched relief portions 6fk and 6rk are formed to avoid interference with components (components of the unlocking holding mechanism LL described later) which are attached to the movable side portion Ss and rotate together with the movable side portion Ss. Ru. As a result, there is no concern that the support wall W will be an obstacle when rotating the movable side portion Ss, and the workability can be enhanced.

  Further, a part (the front wall 6 f in the illustrated example) of the support wall W is adjacent to one of the exposed portions 5 a of the wire-like frame 5 and fastened with a bolt b and a nut n. As described above, the support wall W supporting the side frame pivotally supporting portion of the movable side portion Ss is also used as the to-be-fastened portion to which the side frame Fs is to be fastened to the cushion frame Fm. It is possible.

  Further, a mounting wall 6rw extending backward is fixed to the rear wall 6r of the support wall W, and a second portion of the cushioning frame Sm exposed from the tip of the cushion frame Fm and the tip of the mounting wall 6rw. The bolt 5b is fastened by a bolt b and a nut n at a position offset from the bottom plate frame B of the movable side portion Ss to one side in the vehicle longitudinal direction (rear side in the illustrated example). By the offset effect of the fastening portion, when performing the work of fastening the side frame Fs to the cushion frame Fm, it is possible to effectively avoid the obstacle of the movable side portion Ss, and the workability is enhanced.

  Further, between the side frame Fs and the bottom plate frame B, a return spring 10 as biasing means for biasing the movable side portion Ss toward the standing position U is interposed. In the illustrated example, the return spring 10 is formed of a torsion coil spring that surrounds a spring support shaft 9 installed between the front and rear hinge walls 7f and 7r on the side of the pivot shaft 8. One end of the spring 10 is a bottom plate The extension plate portion 21a of the frame B is engaged, and the other end is engaged with one of the front and rear hinge walls 7f and 7r. Thus, the movable side portion Ss is resiliently held at the standing position U by the resilient force of the return spring 10 in its free state. As means for assisting the biasing force of the return spring 10, for example, at least one auxiliary spring (not shown) can be used as necessary, in which case each auxiliary spring comprises the side frame Fs and the bottom plate frame B. And the return spring 10 is interposed in parallel.

  By the way, between the side frame Fs and the bottom plate frame B, a lock mechanism L capable of locking the movable side portion Ss (bottom plate frame B) to the upright position U is interposed. Next, the configuration of the lock mechanism L will be described with reference to FIG. 6 and FIG. 7 together.

  The lock mechanism L is supported on the lock mechanism support frame Bl at a predetermined stroke, that is, a lock bar 12 slidably supported back and forth between a predetermined lock position (solid line in FIG. 4) and an unlocking position (dotted line in FIG. 4). And a pair of lock members 13 having a first engagement portion 13a engaged with the pair of fork-like lock portions 12a of the lock bar 12 and interlocked with the lock bar 12, and a second of the lock members 13 A pair of locking grooves 14 formed on the outer peripheral portion of the front and rear hinge walls 7f and 7r and the lock bar 12 are resiliently held on the lock position side (left side in FIG. 4) so as to be engageable with and disengageable from the engagement portion 13b , And a lock spring 15 as a holding member. The lock spring 15 is interposed between the spring receiving portion 12 d protruding from the lock bar 12 and the bottom plate frame B in a tension state. The front and rear hinge walls 7f and 7r with the locking groove 14 function as a latch that allows the locking member 13 to be disengaged.

  In the lower frame plate 21 of the bottom plate frame B, a guide wall for slidingly guiding the lock bar 12 is provided by cutting and raising a part of the lower frame plate 21 or the like. The locking groove 14 is formed of a wide first shallow groove 14a in the circumferential direction and a deep second groove 14b recessed in the bottom of one end of the first groove 14a.

The lock member 13 is rotatably connected to and supported by the lock mechanism support frame B1 via the pivot shaft 16, and the lock operating position where the second engagement portion 13b is inserted into and engaged with the second groove portion 14b (solid line in FIG. 4) 5 (A) and a lock inoperative position (see FIG. 4 chain line, FIG. 5 (B)) which can not be locked in the second groove 14 b and stays in the first groove 14 a. It can turn around 16 times. Then, the resilient force of the lock spring 15 always biases the lock member 13 to the lock operation position side (counterclockwise in FIG. 4) via the lock bar 12.

  Thus, the second engagement portion 13b of the lock member 13 is engaged with one end and the other end of the first groove portion 14a in the circumferential direction, whereby the rotation range of the lock member 13 is limited within a predetermined range. The rotation range of the movable side portion Ss is limited. Further, the lock member 13 is arranged to face the second groove portion 14b only when the movable side portion Ss is at the upright position U, and the lock member 13 can be pivoted to the lock operation position side. Become. When the lock member 13 is in the lock operation position and the second engagement portion 13b is engaged with the second groove portion 14b, the movable side portion Ss is at the upright position U by the rotation restriction of the lock member 13. It is locked.

  In the bottom plate frame B of the movable side portion Ss, the lock mechanism L is switched and held in the unlocked state against the lock spring 15 of the lock mechanism L when actuated, and when the lock mechanism L is not actuated, the lock mechanism L is resilient. An unlocking holding mechanism LL is provided that allows the force to automatically return to the locked state. Next, the configuration of the lock release holding mechanism LL will be described.

  The lock release holding mechanism LL is operatively connected to the lock mechanism L to switch and hold the lock mechanism L in the lock release state (that is, the state in which the second engagement portion 13b of the lock member 13 is separated from the second groove portion 14b). Position (FIG. 7 (C)), and inoperability that allows the lock mechanism L to automatically return to the lock operating state (that is, the state in which the second engagement portion 13b of the lock member 13 is locked to the second groove 14b). When the lock release mechanism 31 is interlocked with the lock mechanism L and the lock mechanism L is in the lock operation state, the lock release holding member 31 which can rotate between the position (FIG. 7A) and the lock release mechanism 31 (see FIG. ), And the link mechanism 33 located in the second operation position (FIG. 7C) when in the unlocked position, and an operation connected to the link mechanism 33 for arbitrarily operating the unlocking holding mechanism LL. With the input unit And an operation lever 34 of Te. The lock release holding member 31 is pivotally supported by the U-shaped first bracket 30 fixed to the bottom plate frame B of the movable side portion Ss, and the link mechanism 33 includes the first bracket 30 and the lock bar 12. And is pivotally connected to a second bracket 32 which is fixed to the housing.

  That is, the lock release holding member 31 is pivotally supported by one side wall extension of the first bracket 30 via a pivot shaft 29 about a horizontal axis, and a vertical through the rotation axis A connecting portion with the holding spring 35 is disposed in the first half 31A on one side of the front and rear sides across the face, and a second half 31B on the other side of the front and rear sides is engaged with a first and a second engagement described later. Joints 36a and 36b are provided. The spring fixing end of the holding spring 35 is connected to the side wall extension of the first bracket 30, and resiliently biases the unlocking holding member 31 in a predetermined direction (clockwise in FIG. 7).

  The link mechanism 33 has first and second brackets 30 and 32 whose base ends are pivotally supported by the first and second brackets 30 and 32 so as to be rotatable about horizontal axes via pivots 27 and 28, respectively. Two links 37 and 38 are provided. The distal ends of the links 37 and 38 are pivotably connected to each other about a horizontal axis via a pivot 26. At the axial end of the pivot 26, the first and second engagements of the unlocking holding member 31 are performed. The switching holding pin 39 as an engaged portion which can be engaged with the joint portions 36a and 36b is integrally provided.

The switching holding pin 39 engages with the first engaging portion 36a of the unlocking holding member 31 when the link mechanism 33 is in the first operating position (FIG. 7A), thereby releasing the unlocking holding mechanism. LL is held in the inoperative state, and is engaged with the second engagement portion 36b of the lock release holding member 31 when the link mechanism 33 is in the second operation position (FIG. 7C) to hold the lock release. Hold the mechanism LL in the operating state. Further, the engagement state of the switching holding pin 39 with respect to the first and second engaging portions 36 a and 36 b can be held by the elastic force of the holding spring 35.

  The first link 37 can be pivoted back and forth around the axis of the pivot 27 by pivotably connecting and supporting the pivot 27 integrally coupled with the base end of the first link 37 to the first bracket 30. The base of the operation lever 34 is coupled to the pivot shaft 27 so as to be integrally pivotable. When the lock mechanism L is in the lock operation state shown by the solid line in FIG. 4 and in FIG. 5A and FIG. The link mechanism 33 is moved from the first operating position (FIG. 7A) to an intermediate position against the resilient force of the holding spring 35 and the lock spring 15 by operating upward to the operation position shown by the same broken line. It can be manually operated to the second operating position (FIG. 7C) through (FIG. 7B). In addition, the recessed part which receives the operation part of the control lever 34 is formed in the outer surface of movable side part Ss.

  Furthermore, in the second half 31B of the lock release holding member 31, the switch holding pin 39 slides from one side to the other at an intermediate position between the first and second engaging portions 36a and 36b. A side view chevron-shaped guide portion 36g for guiding is formed. The guide portion 36g has a switch top 36gt in which the top is rounded and raised in the middle of the guide 36g, and the switch support pin 39 passes over the switch top 36gt. While moving from any one of the first and second engaging portions 36a and 36b to the other, the biasing state of the holding spring 35 is engaged, and the switching holding pin 39 is engaged with one of the first and second engaging portions 36a and 36b. It is possible to switch to a mode in which the switching holding pin 39 is engaged with and held by the other of the first and second engaging portions 36a and 36b from the joint holding mode.

  Furthermore, between the side frame Fs and the lock release holding mechanism LL, when the lock release holding mechanism LL is in the operating state, the lock release holding mechanism LL is not operated according to the downward rotation, ie, tilting of the movable side portion Ss. A return mechanism R is provided to switch to the state.

  The return mechanism R includes a return member 50 protruding upward from the side frame Fs and an engagement arm connected to the lower end of the second half 31B of the lock release holding member 31 corresponding to the return member 50. It consists of 31Ba. The return member 50 is rotated downward by a predetermined amount while the movable side portion Ss is rotated downward with the lock release holding member 31 in the operating position (FIG. 7C). When it reaches, it abuts on the engaging arm 31 Ba of the lock release holding member 31 to forcibly rotate the lock release holding member 31 to the inoperative position (FIG. 7A). Further, the return member 50 is formed with a smoothly curved escape portion 50a to avoid interference with the lock release holding member 31. By specially providing the escape portion 50a, the engagement arm 31Ba of the lock release holding member 31 is formed. In the process in which the movable side portion Ss is further rotated downward after engagement with the return member 50, mutual interference between the lock release holding member 31 and the return member 50 can be avoided without difficulty.

  Although the return member 50 of the return mechanism R is shown provided on the side frame Fs in the illustrated example, the return member may be provided on a fixing member other than the side frame Fs, for example, a vehicle body frame.

Also, the right and left end portions of the cushion body Sm may always cover the lock mechanism L, the lock release holding mechanism LL, the side frame Fs, etc. right below the movable side portion Ss with good appearance both when standing up and tilting the movable side portion Ss. The flexible cover 60 (see FIG. 1A) is stretched. Note that, instead of such a flexible cover 60, the lock mechanism L, the lock release holding mechanism LL, and the like can be provided by other suitable covering means, for example, a cover body erected on a floor frame (for example, side sill) of a vehicle body.
, And the side frame Fs may be covered. Furthermore, instead of the flexible cover 60, the skin 4 covering the surface of the cushion pad 3 of the movable side portion Ss is extended downward to fix the floor frame (for example, side sill) of the vehicle body or a fixed installation thereon It may be fixed by bonding or other suitable fixing means, in which case the lower extension of the skin 4 functions as a flexible cover.

  Next, the operation of the first embodiment will be described. In the normal use state of the seat A, as shown in FIG. 1A, FIG. 8A, etc., the movable side portion Ss of the seat cushion S is at the standing position U slightly raised from the upper surface of the cushion main body Sm The upright posture of the movable side portion Ss is reliably held by the lock mechanism L in the lock operation state. Therefore, the movable side portion Ss in the upright state enhances the holdability of the occupant sitting on the seat cushion S. In the lock operation state, as shown by the solid line in FIG. 4, the lock bar 12 resiliently urged to the lock position by the lock spring 15 holds the lock member 13 in the locking position with the second groove 14b. Thus, the movable side portion Ss (bottom plate frame B) is held by being rotationally restricted. Further, in the locked state, the lock release holding mechanism LL is in the non-operated state, that is, the position shown in FIG. 7A, and the switch holding pin 39 of the link mechanism 33 is the first engagement of the lock release holding member 31. The engagement portion 36a is engaged and held.

  From such a state, when the occupant sitting on the seat cushion S is going to get off, first, the control lever 34 and thus the link member 37 are manually turned by a predetermined angle. From this, the link mechanism 33 of the lock release holding mechanism LL is displaced to the state of (C) through FIG. 7B, and at this time, the switching holding pin 39 resists the elastic force of the holding spring 35 and the first From the engaging portion 36a through the guide portion 36g, it slides to the second engaging portion 36b, and at that time, the lock release holding member 31 pivots clockwise in FIG. At the same time, the lock bar 12 is pulled to the unlocking position against the elastic force of the lock spring 15, and the locking member 13 interlocked with the pulling is pivoted to the unlocking position (dotted line in FIG. 4). As shown in (B), it is separated from the second groove 14 b of the locking groove 14. Thus, even if the movable side portion Ss is held at the rising position U by the resilient force of the return spring 10, the lock mechanism L is in the unlocked state, and this unlocked state is held by the unlocking holding mechanism LL. This state is shown in FIG. 8 (B).

  Next, from this state, when the occupant dismounts, the weight acts on the movable side portion Ss as a downward load, whereby the movable side portion Ss is gradually resisted against the elastic force of the return spring 10. When it pivots and is slightly tilted as shown in FIG. 8 (C) to FIG. 9 (D), the lock release holding mechanism LL switches from the operating state to the non-operating state. That is, when the movable side portion Ss is pivoted downward by a predetermined angle (that is, to a predetermined pivoting position before the tilting position D), the engaging arm 31Ba of the unlocking holding member 31 engages with the return member 50 of the return mechanism R. Do. In conjunction with the engagement, the unlocking holding member 31 is turned counterclockwise in FIG. 7 against the elastic force of the holding spring 35, and the switching holding pin 39 is engaged in the second engagement reversely to the previous step. It slides to the first engagement portion 36a from the portion 36b through the guide portion 36g, and returns to the position of FIG. 7 (A). In this state, the lock release from the lock release holding mechanism LL to the lock bar 12 is released, so the lock bar 12 tries to automatically return to the lock position side by the elastic force of the lock spring 15, and the lock member interlocks with this. 13 also attempts to automatically return to the lock position side (i.e., the position locked to the second groove 14b). However, at this time, since the second engaging portion 13b of the lock member 13 is in sliding contact with the first groove 14a but is not located opposite to the second groove 14b, it can not be locked in the second groove 14b.

  Such a non-operating state of the lock release holding mechanism LL continues until the occupant passes the movable side portion Ss and the weight does not act on the movable side portion Ss, and the downward rotation of the movable side portion Ss is performed until then. Is acceptable (FIG. 9 (E)).

Next, when the occupant passes the movable side portion Ss and the weight does not act on the movable side portion Ss, the movable side portion Ss is automatically operated by the resilient force of the return spring 10 as shown in FIG. The lock mechanism L is in the lock operation state, that is, the second engagement portion 13b of the lock member 13 is locked in the second groove 14b at the same time as it reaches the upright position U. Automatically return to

Second embodiment

  Next, a second embodiment of the present invention will be described with reference to FIGS. Also in the second embodiment, the movable side portion Ss is operated and input from the non-operation position indicated by the solid line in FIG. 13 to the upper operation position indicated by the dashed line in the state where the movable side portion Ss is held at the upright position U. After that, the movable side portion Ss is tilted from the standing position U according to the weight of the occupant (that is, a predetermined downward load) acting on the movable side portion Ss, and after the tilting, the downward load acting on the movable side portion Ss is a predetermined value It is configured to be automatically returned to the standing position U and to be in the locked state according to the decrease as described below, and such a basic operation is the same as that of the first embodiment.

  However, in the second embodiment, the structure of the side frame Fs 'and the mounting structure thereof to the cushion main body Sm, the lock release holding mechanism LL', the interlocking connection structure between the lock mechanism L and the operation lever 34, etc. It is different from the one embodiment. Next, the differences will be mainly described. The components of the second embodiment having the same structure and function as the components of the first embodiment are indicated by the same reference numerals as the first embodiment, and the specific structures and functions will be described. Is omitted.

That is, also in the second embodiment, as in the first embodiment, the seat cushion S is divided into the cushion main body Sm and the pair of left and right movable side parts Ss, and in the cushion main body Sm, each movable side part Ss is attached so as to be pivotable between an upright position U (solid line in FIG. 12) and a tilted position D (same dotted line), and the movable side portion Ss is further downward than the horizontal position when in the tilted position D I am inclined to Further, between the cushion main body Sm and the movable side portion Ss, there is provided a lock mechanism L which can be switched between a lock operating state capable of locking the movable side portion Ss to the erected position U and an unlocked state not lockable.

  Side frames Fs ', which are separate components, are coupled to the left and right end portions of the cushion frame Fm, which is a framework of the cushion main body Sm, and the movable side portions Ss are rotatably attached to the side frames Fs'. . The side frame Fs' has a U-shape in a plan view from an intermediate pipe portion 80m extending in the front-rear direction and front and rear pipe portions 80f and 80r integrally connected to the front and rear end portions of the intermediate pipe portion 80m via downward curved portions. The frame main body 80 configured as the main part is the main part, and the front and rear end portions of the bending plate-like mounting plate 81 are integrated with the front and rear pipe portions 80f and 80r of the frame main body 80 by coupling means such as welding. Combined. The mounting plate 81 is provided with a plurality of weld nuts 82 and bolt insertion holes 81 h corresponding thereto.

  The intermediate pipe portion 80m serves the same function as the pivot 8 of the side frame Fs of the first embodiment, and between the upper and lower frames 20 and 21 of the bottom plate frame B in the movable side portion Ss (specifically And the extension plate portions 20a and 21a) integrally extending from the side edge on the cushion main body Sm side. As described above, the bottom plate frame B of the movable side portion Ss is pivotally supported by the side frame Fs' via the intermediate pipe portion 80m as a pivot, and the movable side portion Ss stands around the pivoting portion U It is rotatable between and.

Moreover, the intermediate pipe portion 80m integrally couples the front and rear latches 7f 'and 7r' corresponding to the front and rear hinge walls 7f and 7r of the side frame Fs of the first embodiment, respectively, by a coupling means such as welding, The front and rear latches 7f 'and 7r' are provided with a locking groove 14 similar to the locking groove 14 of the first embodiment. The front and rear latches 7f 'and 7r' and the mounting plate 81 constitute a side frame Fs' together with the frame main body 80.

  In the first embodiment, the bottom plate frame B of the movable side portion Ss is a bottom plate frame main body Bm consisting of a substantially triangular single plate corresponding to the bottom portion shape of the movable side portion Ss, and the bottom plate frame main body Bm is superposed on the lower surface thereof. The lock mechanism support frame Bl is composed of a welded substantially rectangular lock mechanism support frame Bl, and the lock mechanism support frame Bl is formed into a double sheet structure by the upper frame plate 20 and the lower frame plate 21 which is polymerization welded to the lower surface thereof. However, in the second embodiment, the bottom plate frame main body Bm of the first embodiment is omitted by enlarging the upper frame plate 20 as a substantially triangular shape corresponding to the bottom shape of the movable side portion Ss, and the large size thereof. Between the upper frame plate 20 and the lower frame plate 21 of the second embodiment, a bottom plate frame B of a two-sheet laminated structure is obtained by caulking 85 at a plurality of locations. . In place of the crimped connection 85, welding means may be used as in the first embodiment. Further, similarly to the first embodiment, a return spring 10 as biasing means for biasing the movable side portion Ss toward the standing position U is interposed between the side frame Fs' and the bottom plate frame B. However, the attachment structure of the return spring 10 is also the same as that of the first embodiment.

  As apparent from FIG. 11, a part of the wire-like frame 5 'constituting a part of the cushion frame Fm is exposed from the left and right sides of the cushion main body Sm, and the exposed part 5c is flat It is formed in a U-shape visually. The three sides of a side frame attachment member 70 formed in a bent plate shape so as to be superposed on the lower surface of the mounting plate 81 of the side frame Fs' are integrally coupled to the exposed portion 5c with a coupling means such as welding. Be done. Then, the side frame Fs 'is detachably mounted to the exposed portion 5c of the wire-like frame 5' through the side frame mounting member 70.

  Referring also to FIGS. 12 and 13, a side frame support member 71 capable of supporting a part of the load from the side frame Fs' is disposed on the lower surface of the side frame attachment member 70. The side frame support member 71 is manufactured by integral molding of a synthetic resin, is formed in a shape generally corresponding to the movable side portion Ss in a plan view, and functions as a cover covering the lower surface of the movable side portion Ss. . At least a part of the bottom wall 71a of the side frame support member 71 has a lower surface shape that can be surface-contacted with the upper surface (in the illustrated example, the inclined upper surface 100a) of the floor frame 100 of the vehicle body.

  Thus, although the downward load from the movable side portion Ss is basically supported by the cushion frame Fm via the side frame attachment member 70, a part of the load corresponds to the side frame attachment member 70 and the side frame support The floor frame 100 can also be dispersedly supported via the member 71. On the upper surface of the bottom wall 71a of the side frame support member 71, a plurality of reinforcing ribs 71r are integrally erected in the vertical and horizontal directions, and the rib intersection and the bottom wall 71a are formed in the longitudinal and lateral rib intersections. The mounting boss portion 71 b straddling the two is integrally formed.

  A side frame mounting member 70 is vertically held between the side frame support member 71 and the mounting plate 81 of the side frame Fs', and the three members 71, 81, 70 are detachably attachable by a plurality of bolts 73. It is tightened together. The bolt 73 is inserted into the mounting boss 70b of the side frame support member 71 from the lower side, and the bolt insertion holes 70h and 81h of the side frame mounting member 70 and the mounting plate 81 are further inserted. It penetrates and is screwed and tightened to the weld nut 82 on the to-be-attached board 81.

Further, referring also to FIGS. 14 to 18, the lock mechanism L capable of locking the movable side portion Ss to the erected position U is similar to the lock mechanism L of the first embodiment in the front and rear direction in the bottom plate frame B. A lock bar 12 slidably supported, and a pair of lock members 13 interlocked with the lock bar 12 having a first engaging portion 13a which can be engaged with the lock bar 12 so as to be able to rotate relative to the lock bar 12; Each lock member 13 is locked at the lock position (i.e., the second engagement) via the front and rear latches 7f 'and 7r' with the locking groove 14 which can be engaged with and disengaged from the second engaging portion 13b of the locking member 13 A lock spring 15 as a holding member is resiliently held on the side where the joint portion 13b is engaged with the second groove portion 14b of the engagement groove 14). The configuration and function of the lock bar 12, the lock member 13, the locking groove 14 and the lock spring 15 are the same as those of the first embodiment.

  Also in the second embodiment, the lock mechanism L is in the unlocked state (that is, the second engagement portion 13b is disengaged from the second groove portion 14b of the locking groove 14) against the lock spring 15 of the lock mechanism L at the time of operation. State, and in the non-operation state, the lock mechanism L automatically returns to the lock operation state (that is, the state in which the second engagement portion 13b is locked to the second groove portion 14b) by the elastic force of the lock spring 15. Although the lock release holding mechanism LL 'which permits is provided, especially in the second embodiment, the lock release holding member 31' is a transmission path between the operation lever 34 and the lock mechanism L (i.e., a link mechanism 33 'described later) This embodiment differs from the first embodiment in that it is not directly linked, but is attached to the side frame Fs' independently from its transmission path and directly linked to the locking member 13. Next, the configuration of the lock release holding mechanism LL 'will be described.

  The unlocking holding mechanism LL 'is rotatably supported on the bottom plate frame B about the horizontal axis Ph and rotates between the non-operating position (solid line in FIG. 13) and the upper operating position (dotted line in FIG. 13). The operation lever 34 in a state in which the movable side portion Ss is locked at the upright position U by the lock mechanism L and the link mechanism 33 'that interlocks between the operation lever 34 and the lock mechanism L And an unlocking holding member 31 'which is activated in response to an operation input to the operation position side of the camera. When the lock release holding member 31 'is in its operating state, the lock member 13 enters the locking groove 14 and locks (specifically, the second engaging portion 13b enters the second groove 14b and locks) Can be engaged with the locking member 13 so as to prevent

  Similar to the link mechanism 33 of the first embodiment, the link mechanism 33 'converts the rotation operation of the operation lever 34 into the linear motion of the lock bar 12 to input the operation input of the operation lever 34 (that is, to the operation position side). In the second embodiment, the bottom plate frame B is pivotally supported about the horizontal axis Ph in the second embodiment. A second link 91 which rotates integrally with the operation lever 34, and a bell crank which has an intermediate portion pivotally supported by the bottom plate frame B about the vertical axis Pv and one end 92a interlocks with the first link 91; The link 92 and the link 92 are divided. The other end 92b of the second link 92 and the lock bar 12 are either long holes 92h provided in one of them (the other end 92b in the illustrated example) or the other (in the illustrated example, the lock bar 12 side) They are interlocked with each other via an interlocking connection mechanism consisting of a pin 12p provided on the protruding link receiving portion 12c).

  In addition, between the bottom plate frame B and the control lever 34 or the first link 91, as shown in FIGS. 12 to 14, the control lever 34 is resilient toward the non-operating position (ie, clockwise in FIG. 13). A return spring 90 which can be held and held is interposed. The return spring 90 is constituted by a torsion coil spring surrounding the horizontal axis Ph, and one end thereof is locked to the bottom plate frame B and the other end is locked to the control lever 34 or the first link 91, respectively. Then, the bottom plate frame B is provided with stopper means 93 which can be engaged with the operation lever 34 or the first link 91 so as to hold the operation lever 34 in the non-operation position against the return spring 90.

  As a return spring of the operation lever 34, in place of the above-mentioned return spring 90 consisting of a torsion coil spring, for example, as shown in FIG. 22, it is interposed between the bottom plate frame B and the first link 91. A mounted tension spring 90 'may be used.

The tip end portion 91a of the first link 91 is bent in a convex shape toward the second link 92, and the second link 92 contacts an end portion 92a of the second link 92 bent in a convex shape so as to be relatively slidable. The operating force of the operating lever 34 can be transmitted from the first link 91 to the second link 92 through the contact portion. Therefore, in response to the control lever 34 being turned from the non-operation position to the operation position, the first link 91 opposes the lock spring 12 via the second link 92 against the lock spring 15 and the unlocking direction ( The slide operation can be performed in the right direction in FIGS. By making the link mechanism 33 'such a link configuration and making the lock release holding member 31' separate and independent from the link mechanism 33 'as described later, it is possible to avoid that the link mechanism 33' is bulky in the vertical direction as much as possible. This is advantageous in miniaturizing the movable side portion Ss in the vertical direction.

  Further, the lock release holding member 31 'is disposed adjacent to at least one of the front and rear latches (the rear latch 7r' in the illustrated example) and extends from the substantially L-shaped rigid plate extending along the plate surface of the latch 7r '. The base end portion 31A 'is rotatably supported by the rear latch 7r' via a pivot 95. The lock release holding member 31 ′ is locked so as to prevent the lock member 13 (second engaging portion 13 b) from entering the locking groove 14 (second groove portion 14 b) and locking the lock release holding member 31 ′. It is movable between an operating position (shown by a solid line in FIG. 17) which can be engaged with the reference numeral 13 and an inoperative position (indicated by a dotted line) which permits the entry and the locking.

  Furthermore, between the unlocking holding member 31 'and the rear latch 7r', a torsion coil spring surrounding the pivot 95 is constituted to elastically bias the unlocking holding member 31 'to the actuating position side. A return spring 96 is interposed. Then, a stopper 98 capable of holding the lock release holding member 31 'in the actuating position against the elastic force of the return spring 96 is integrally protruded on the side surface of the rear latch 7r'. The stopper 98 engages with the middle projecting portion 31C 'of the unlocking holding member 31' when the unlocking holding member 31 'is in the actuated position, and exceeds the operated position with respect to the unlocking holding member 31'. Regulate rotation so as not to occur.

  Thus, the lock member 13 is in the lock operation state of the lock mechanism L as shown in FIGS. 14, 16 and 17 (that is, the second engagement portion 13 b of the lock member 13 is engaged with the second groove 14 b of the locking groove 14). In the stopped state, the lock release holding member 31 'is engaged with the lower surface of the tip portion 31B' of the lock release holding member 31 'so as to be held in the inoperative position against the return spring 96.

  In addition, when the operation lever 34 is operated to the operation position side in the engaged state, the lock bar 12 interlocked with this via the link mechanism 33 'slides in the unlocking direction, The interlocking lock member 13 releases the lock to the locking groove 14 (that is, the second engagement portion 13b is separated from the second groove portion 14b), and the lock mechanism L is unlocked, and the inoperative position The lock release holding member 31 'is released. With the release, the unlocking holding member 31 'is pivoted from the previous inoperative position to the actuating position by the resilient force of the return spring 96, whereby the unlocking holding member 31' is mounted as shown in FIGS. As shown in B), the lock mechanism L is held in the unlocked state.

  In the lock release holding state, the lock release holding member 31 ′ is locked by the flat stopper surface 94 formed at the tip end portion 31 B ′ of the lock release holding member 31 ′ abutting on the end surface 13 bs of the second engagement portion 13 b of the lock member 13. The member 13 (second engaging portion 13b) is prevented from entering into the locking groove 14 (second groove 14b) and locking. Therefore, even if the operating lever 34 is automatically returned to the non-operating position by the resilient force of the return springs 90 and 90 'when the operator releases the operating lever 34, the unlocking holding state of the lock mechanism L is maintained. Ru.

Further, between the lock member 13 and the lock release holding member 31 ′, the lock release holding member 31 ′ is used as a resilient force of the return spring 96 in the process of the movable side portion Ss tilting from the standing position U and returning to the standing position U again. An interlocking mechanism R 'is provided that allows the lock release member 31' to be relatively slidably linked to the lock member 13 so that the lock member 13 can be forcibly moved from the operating position to the inoperative position. The interlocking mechanism R 'has a guide surface 99c having an arc-like cross section which smoothly connects between the lower surface of the tip 31B' of the lock release holding member 31 'and the stopper surface 94 in the illustrated example, and the guide surface 99c. The second engaging portion 13b of the locking member 13 that can be in sliding contact with the end surface 13bs and the upper surface 13bt. Thus, the interlock mechanism R 'of the present invention switches the lock release holding mechanism LL' to the non-operation state according to the tilting of the movable side portion Ss when the lock release holding mechanism LL 'is in the operation state. Configure

  In addition, the right and left end portions of the cushion body Sm are flexible immediately below the movable side portion Ss so that the lock mechanism L, the lock release holding mechanism LL, the side frame Fs, etc. are neatly covered when the movable side portion Ss stands up and leans. Sex cover is stretched. In this embodiment, the lower extension 4a of the skin 4 of the cushion pad 3 of the movable side Ss is used as the flexible cover, and the lower extension 4a is a floor frame 100 of the vehicle body or a fixed installation on the floor frame 100. Or fixed to the outer surface of the side frame support member 71 by an appropriate fixing means.

  For example, in the present embodiment, a plurality of hook-like elastic clips 87 are sewn or adhered to the free end of the lower extension 4a of the skin 4 at a distance from each other. Then, the clip 87 is engaged with the inner edge of the bottom wall portion 71a of the side frame support member 71 so as to be able to be engaged and disengaged in a state where the lower extension 4a is wound around the lower surface of the side frame support member 71 as shown in FIG. Let As the fixing means, in place of such a clip 87, a rubber string or the like which is sewn on the free end of the lower extension 4a and has the free end crimped to the outer surface of the side frame support member 71 is used. You may use. Furthermore, as the flexible cover, a dedicated cover may be used without using the lower extension 4 a of the skin 4.

  Next, the operation of the second embodiment will be described. In the normal use state of the seat A, the movable side portion Ss of the seat cushion S is at the standing position U as shown in FIGS. 12, 16 and 17, and the standing posture of the movable side portion Ss is in the locked state. It is locked by the lock mechanism L. In the locked state, as in the first embodiment, the lock bar 12 resiliently urged to the lock position by the lock spring 15 holds the lock member 13 in the locking position with the second groove 14b and is movable It is hold | maintained by restricting rotation of side part Ss. Further, in this locked state, the lock member 13 is engaged with the lock release holding member 31 'so as to hold the lock release holding member 31' in the inoperative position against the elastic force of the return spring 96. (See FIG. 17), whereby the lock release holding mechanism LL is put in the inoperative state.

  From such a state, when the occupant sitting on the seat cushion S tries to get off, the operator first rotates the operation lever 34 upward from the non-operation position to the operation position. This operating force causes the lock bar 12 to slide in the unlocking direction (rightward in FIG. 15) against the resilient force of the lock spring 15 via the link mechanism 33 'of the unlocking holding mechanism LL, thereby The locking member 13 releases the locking with the locking groove 14 as shown in FIGS. 15 and 19A (that is, the second engaging portion 13b is separated and retracted from the second groove 14b), and the locking mechanism L is released. Is unlocked. At the same time, since the lock member 13 releases the lock release holding member 31 'in the inoperative position, the lock release holding member is released along with the release and the retraction of the second engagement portion 13b from the second groove portion 14b. 31 'is pivoted downward from the previous inoperative position to the operative position by the resilient force of the return spring 96 (Fig. 17 → Fig. 19 (A) → same (B)), whereby the unlocking holding mechanism With LL activated, the lock release holding member 31 'can switch and hold the lock mechanism L in the lock released state.

In the unlocking holding state, the lock release holding member 31 ′ has the second engagement by the stopper surface 94 of the tip portion 31 B ′ of the lock release holding member 31 ′ abutting on the end surface 13 bs of the second engagement portion 13 b of the lock member 13. It prevents the entry and locking of the portion 13b into the second groove portion 14b. Therefore, even if the operator releases the operating lever 34 in this state and the lever 34 is automatically returned to the non-operating position by the resilient force of the return springs 90 and 90 ', FIGS. 15 and 19B. The lock release holding state of the lock mechanism L shown in FIG. Even when the lock mechanism L is in the unlocking holding state as described above, the movable side portion Ss is held at the standing position U by the elastic force of the return spring 10.

  Next, in this state, when the occupant actually intends to dismount, movable side portion Ss resists return spring 10 in accordance with the weight acting on movable side portion Ss as a predetermined downward load. It is gradually rotated or tilted downward, and when it is slightly tilted as shown in FIG. 20C, the lock release holding mechanism LL 'is switched from the operating state to the non-operating state. That is, when the movable side portion Ss rotates downward by a predetermined angle, the end surface 13bs of the second engaging portion 13b of the lock member 13 which follows and descends downward with respect to the stopper surface 94 of the lock release holding member 31 '. It slides into the lower part of the guide surface 99c (ie, does not face the stopper surface 94). As a result, even if the lock release holding member 31 'is in the operating position, the lock release holding member 31' can not block the entry and locking of the second engaging portion 13b into the second groove portion 14b. LL 'is inactivated. However, even in such a non-operating state of the lock release holding mechanism LL ', the second engagement portion 13b of the lock member 13 is in contact with the shallow first groove portion 14a of the locking groove 14, and the locking groove The second engaging portion 13b enters into and is locked in the second groove portion 14b (i.e., the lock mechanism L is locked) because it is not in the opposite position to the second groove portion 14b existing at the upper end of the 14th position. Also, the lock release holding member 31 'does not return to the inoperative position.

  When the movable side portion Ss is further rotated downward from this state, the lock member 13 leaves the lock release holding member 31 'and descends. When the second engaging portion 13b of the lock member 13 engages with the lower end of the first groove portion 14a as shown in FIG. 20D along with the lowering, the lowering of the movable side portion Ss is at the tilting position D (i.e., the lowering). Limited).

  Next, when the occupant passes the movable side portion Ss and the weight does not act on the movable side portion Ss, the movable side portion Ss automatically rotates upward to the standing position U by the elastic force of the return spring 10. I assume. At this time, as shown in FIG. 21 (E), the lock member 13 that follows and ascends to the movable side portion Ss engages with the guide surface 99c of the lock release holding member 31 'and slides on the upper surface 13bt of the second engagement portion 13b. When it contacts, it will try to lift lock release holding member 31 'from the bottom. When the second engaging portion 13b ascends to a position where it opposes the second groove portion 14b of the locking groove 14, the second engaging portion 13b is locked while sliding the upper surface 13bt to the guide surface 99c of the unlocking holding member 31 '. The resilient force of the spring 15 causes the second groove portion 14 b to enter and lock at once.

  Thus, in the process in which the movable side portion Ss tilts from the standing position U and returns to the standing position U again, the lock mechanism L automatically returns to the lock operating state and mechanically interlocks with the lock member 13 of the lock mechanism L. As a result, the lock release holding member 31 'is automatically returned to the inoperative position from the operative position. Therefore, the lock release holding mechanism LL 'which has been activated by the operation input of the operation lever 34 is automatically inactivated mechanically interlockingly with the movement of the movable side portion Ss (in particular, the lock member 13) in the above process. Since the state is switched, it is not necessary to perform a special operation for returning the lock release holding mechanism LL 'to the inoperative state.

  In the first and second embodiments described above, the lock release mechanism is configured to switch and hold the lock mechanism L in the lock release state during operation and allow the lock mechanism L to automatically return to the lock operation state when not operating. The lock release holding mechanisms LL and LL 'can be switched from the non-operation state to the operation state in conjunction with the operation input to the operation lever 34.

Thus, after the operation lever 34 is operated to the operation position side while the movable side portion Ss is locked and held at the upright position U, the lock mechanism L is switched and held in the unlocked state, and this state The movable side portion Ss is automatically tilted from the standing position U in response to the occupant weight (predetermined downward load) acting thereon. Therefore, after the operation lever 34 is operated and input to the operation position side, the movable side portion Ss can be held at the upright position U in a state where it can be tilted at any time even if the operation lever 34 is released. Therefore, there is no need to specially tilt the movable side portion Ss in order to tilt the movable side portion Ss from that state, and the operability is excellent. That is, when the occupant on the cushion body Sm tries to dismount, the movable side portion Ss can not be pushed by the weight of the occupant without performing any special tilting operation only by operating the operation lever 34 to the operation position side. The movable side portion Ss can be prevented from becoming an obstacle to the passenger's drop-off operation while the operability can be improved, whereby the passenger is not disturbed by the movable side portion Ss. It can be dismounted quickly and easily.

  Moreover, in the first and second embodiments, the return mechanisms R and R 'switch the lock release holding mechanisms LL and LL' from the operating state to the non-operating state in response to the downward rotation of the movable side portion Ss. In the side portion Ss, after tilting from the standing position U, the movable side portion Ss receives the resilient force of the return spring 10 in response to the downward load acting on the movable side portion Ss decreasing to a predetermined value or less. Automatically return to Since the lock mechanism L returns to the lock operation state along with it, the movable side portion Ss returned to the upright position U can be automatically locked, and there is no need to perform a lock operation specially, so the operability is further improved. In addition, the movable side portion Ss locked at the standing position U during traveling ensures the holding property of the occupant. Moreover, since the tilt holding lock mechanism for locking the movable side portion Ss to the tilt position D can be omitted, the seat structure can be simplified accordingly.

  Furthermore, in the first and second embodiments, the movable side portion Ss is locked on the side frame Fs, Fs 'which is a separate component from the cushion frame Fm which is the framework of the cushion main body Sm, and the unlocking holding mechanism LL, LL'. Because they can be assembled together as a single unit, they can be handled as a single subassembly or subassembly. Therefore, not only can the cushion frame Fm on the cushion main body Sm side be miniaturized, but the movable side portion can be obtained simply by connecting the side frame Fs, Fs' of the above-mentioned subassembly assembled in another line beforehand to the cushion frame Fm. Since Ss can be easily and quickly and accurately assembled to the cushion body Sm, productivity improvement and cost reduction can be achieved. Further, even when changing the shape, size, etc. of the movable side portion Ss due to model change etc., it is only necessary to change the side frames Fs, Fs' which are small parts, and a cushion body including the cushion frame Fm which is a large part. It is possible to suppress the change of Sm to unnecessary or slight change, and it becomes easy to cope with it and save cost.

  Incidentally, temporarily, the cushion frame Fm extends outward beyond the cushion main body Sm, and the movable side portion Ss is pivotally supported by the frame extension portion, and the lock mechanism L is interposed between the frame extension portion and the movable side portion Ss. In the case where a shock absorber or the like is interposed, not only the cushion frame Fm serving as the framework of the cushion main body Sm is upsized, but the movable side portion Ss needs to be directly assembled to the cushion main body Sm (cushion frame Fm) which is a large part In addition, the assembly process becomes complicated and securing of assembly accuracy is not easy, and when the shape, size, etc. of the movable side portion Ss are changed due to model change, etc., it is a large part corresponding to this. There is a problem that the cushion main body Sm (cushion frame Fm) itself also needs to be changed and the change is not easy. However, if the side frames Fs and Fs' which are parts different from the cushion frame Fm are adopted as in the present embodiment and the movable side portion Ss is assembled to this, these problems can be solved at once.

Particularly, in the first embodiment, when the movable side portion Ss is pivoted downward from the standing position U when getting off, the lock release holding member 31 of the lock release holding mechanism LL in the operating state and the return member 50 of the return mechanism R. The lock release holding member 31 can be turned from the operating position to the inoperative position and the lock release holding mechanism LL can be switched to the inoperative state only by mechanically engaging the At the same time, the switching operation is performed reliably. Moreover, in the first embodiment, the switching holding pin 39, which is the engaged portion of the link mechanism 33 interlocked with the lock mechanism L of the lock release holding mechanism LL, is engaged with the first and second engagements of the lock release holding member 31. The lock release holding mechanism LL can be properly held in the operating state and the non-operating state respectively by the simple configuration in which the portions 36a and 36b are selectively engaged. Moreover, since the lock release holding member 31 is provided with a guide portion 36g for guiding the engagement portion of the link mechanism to move from one of the first and second engagement portions 36a and 36b to the other, The lock release holding mechanism can be switched smoothly and smoothly between the operating state and the non-operating state.

  Furthermore, in the lock release holding member 31 of the first embodiment, the lock release holding member 31 can be held so as to be able to hold the engagement state of the first and second engaging portions 36a, 36b thereof with the switch holding pins 39 respectively. The holding spring 35 to be biased is connected, and the guide portion 36g is attached to the holding spring 35 while the switching holding pin 39 is moved from one of the first and second engaging portions 36a and 36b to the other by the guide thereof. The switching holding pin 39 is engaged with the other of the first and second engaging parts 36a and 36b from the aspect of engaging the switching holding pin 39 with one of the first and second engaging parts 36a and 36b. Since the switching top portion 36 gt is switched to the holding mode, the single holding spring 35 can hold the engagement state of the first and second engaging portions 36 a and 36 b with the switching holding pin 39 respectively, and hence simple Create an unlocking holding mechanism 31 with the structure The respective appropriately be held in the state and the inoperative state. Furthermore, the holding spring 35 is disposed on one side of a vertical plane passing through the pivot shaft 29 of the lock release holding member 31, and the first and second engagement portions 36a and 36b and the guide portion 36g are disposed on the other side. Therefore, the lock release holding mechanism LL can be configured compactly while avoiding mutual interference between the holding spring 35 and the link mechanism 33 without difficulty.

  In particular, the lock release holding member 31 'of the second embodiment is engaged with the lock member 13 so as to block the lock member 13 from entering into the locking groove 14 (second groove portion 14b) and locking in the operating position thereof. It is an arrangement configuration that can be matched. Therefore, since the lock release holding member 31 'can be directly linked to the lock member 13, not only the structure of the lock release holding member 31' can be simplified and miniaturized, but also the structure of the link mechanism 33 ' It is possible to miniaturize, and it is possible to effectively suppress the overall enlargement of the lock release holding mechanism LL ′. Moreover, since the lock release holding member 31 'is disposed adjacent to the latch 7r' of the lock mechanism L, the holding force of the lock release holding member 31 'can be efficiently transmitted directly to the lock member 13, and thus the lock release holding member 31. The 'structure can be made simpler and smaller.

  Further, the lock release holding member 31 'of the second embodiment has an operation position where it can be engaged with the lock member 13 so as to prevent the lock member 13 from entering the locking groove 14 (second groove portion 14b) and locking. The movable side portion Ss interlocks with the lock member 13 which follows and rises when the movable side portion Ss returns to the standing position U after the tilting. Then, the lock release holding member 31 'is moved from the operative position to the inoperative position. Accordingly, in a state where the inclined movable side portion Ss returns to the upright position U by the elastic force of the return spring 10, the lock release holding member 31 'is automatically returned to the inoperative position by a simple interlocking structure using the lock member 13. It can be done.

In the second embodiment, the locking member 13 is inoperable against the return spring 96 with the locking release holding member 31 'in a state in which the locking member 13 is locked in the locking groove 14 (second groove 14b) of the latch 7r'. By engaging with the lock release holding member 31 'so as to be held in the position, the movable side portion Ss can be reliably locked at the upright position U normally without being disturbed by the lock release holding member 31'. Further, in conjunction with the operation lever 34 being operated to the operation position side in the locked state, the lock member 13 is released from the locking with respect to the locking groove 14 and the lock release holding member 3
1 'is released, whereby the lock release holding member 31' is pivoted downward from the inoperative position to the operative position by the resilient force of the return spring 96, so that the lock is released in response to the operation input to the operation lever 34 The holding state is easily obtained. Further, in the process in which the movable side portion Ss tilts from the standing position U and returns to the standing position U again, the interlocking mechanism R 'linking the lock release holding member 31' to the lock member 13 so as to be relatively slidable 31 'can be forced to move from the actuated position to the inactive position against the return spring 96. As a result, the lock release holding member 31 'has a simple arrangement configuration independent and independent from the transmission path (i.e., the link mechanism 33') between the operation lever 34 and the lock mechanism L. Since 'can be linked directly to the lock member 13, the switching operation between the operating position and the non-operating position of the lock release holding member 31' can be properly performed, so that the structure of the lock release holding mechanism LL 'can be further simplified. And miniaturization can be achieved.

  Furthermore, in the second embodiment, the plate-like side frame attachment member 70 is coupled to the portion 5c of the wire-like frame 5 that constitutes a part of the cushion frame Fm, which is exposed from the outer surface of the cushion body Sm. Since the side frame Fs 'is attached to the wire-like frame 5 through the member 70, the side frame Fs' is easier to attach than when it is directly attached to the narrow and meandered wire-like frame 5, and the side frame The design freedom of Fs' and the wire-like frame 5 also increases. Further, since the side frame support member 71 capable of supporting a part of the load from the side frame Fs' is disposed below the side frame attachment member 70, the side frame Fs' is suppressed while the enlargement of the side frame Fs' is suppressed. It is possible to increase the supporting strength of Fs', and further, since the side frame supporting member 71 also serves as a cover member covering the lower side of the movable side portion Ss, the structure can be simplified and the cost can be saved accordingly. Moreover, since the side frame attachment member 70 is held and fixed between the side frame Fs' and the side frame support member 71, the support strength of the side frame Fs' is achieved while simplifying the support structure for the side frame Fs'. It can be enhanced.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments, and various embodiments are possible within the scope of the present invention.

  For example, while the vehicle seat of the present invention is applied to the rear seats of four front and rear rows of four-wheeled vehicles in the above embodiment, the front seat and three front and rear rows of minivan type automobiles are shown in the present invention. It may be applied to the sheet. The vehicle on which the seat is mounted may be a four-wheeled vehicle, a three-wheeled vehicle, a bus, a truck, a railway vehicle, an aircraft, etc., as well as a four-wheeled vehicle.

  In the above embodiment, a pair of rotatable left and right movable side portions Ss are disposed adjacently to the left and right sides (alighting end side) of the cushion main body Sm of the rear seat A. The movable side portion Ss may be disposed inward in the vehicle width direction on the left and right center sides of the cushion main body Sm, that is, on the left and right seat surfaces. In this case, the movable side portion Ss is inclined by There is an advantage that the lateral movement of the occupant between the left and right seat surfaces can be smoothly performed without being disturbed by the movable side portion Ss. In addition, when the present invention is applied to a front seat for one person, at least one of the left and right sides (ingress and exit sides) and the other (inward direction in the vehicle width direction) of the seat surface of the cushion main body Sm is movable side portion Ss. Is provided.

  In the embodiment described above, the operation release unit for operating the lock release holding mechanism LL arbitrarily uses the operation lever 34 for direct manual operation input by manual (manual) operation. The operation input unit may be configured by switch means capable of generating power with an actuator such as an electric motor and outputting an operation command signal to the actuator.

In the above embodiment, the return mechanisms R and R 'for switching the lock release holding mechanisms LL and LL' in the operating state to the non-operating state are mechanically interlocked with the downward rotation, that is, tilting of the movable side portion Ss. Although the release holding mechanisms LL and LL 'have been switched to the non-operating state, in the present invention, the actuators such as the electric motor capable of forcibly switching the lock release holding mechanisms LL and LL' to the non-operating state are shown. Or using a detection means such as a sensor for detecting the upward rotation immediately after the downward rotation or downward rotation of the movable side portion Ss, and the electricity for the upward rotation immediately after the downward rotation or downward rotation of the movable side portion Ss The lock release holding mechanism LL may be switched to the inoperative state in an interlocked manner.

Claims (24)

The seat cushion (S) has a cushion body (Sm) and a movable side portion (Ss) provided on the side of the seat surface of the cushion body (Sm), and the cushion body (Sm) has a movable side portion (Ss) A vehicle seat supported so as to be movable between an upright position (U) standing up with respect to the cushion main body (Sm) and a tilted position (D) tilted from the upright position (U),
A lock which is provided between an operation input portion (34) capable of arbitrary operation input , the cushion main body (Sm) and the movable side portion (Ss), and which can lock the movable side portion (Ss) to the upright position (U) A lock mechanism (L) capable of switching between an operating state and an unlockable lock release state; biasing means (10) for biasing the movable side portion (Ss) toward the standing position (U); A holding member (15) for holding the lock mechanism (L) in the lock operation state, and the lock mechanism (L) is activated in conjunction with the operation input unit (34) being operated and A lock release holding mechanism (LL, LL ') for switching and holding L) in the unlocked state and allowing the lock mechanism (L) to automatically return to the locked state when not operated; (LL, LL ) Is provided with said unlocking holding mechanism in response to the tilting of the movable side part when in the operating state (Ss) (LL, 'the return mechanism switching the) deactivates (R, R' LL),
After the operation input unit (34) is operated and input while the movable side portion (Ss) is held at the standing position (U), the movable side portion (Ss) is movable side portion (Ss) From the upright position (U) in response to the application of a predetermined downward load on the
The lock release holding mechanism (LL) is pivotally supported by the movable side portion (Ss) and is connected to the lock mechanism (L) to switch and hold the lock mechanism (L) in the lock release state. And a lock release holding member (31) capable of pivoting between the lock mechanism (L) and an inoperative position which allows the lock mechanism (L) to automatically return to the lock operation state, the return mechanism (R) The lock release holding member (31) is brought into contact with the lock release holding member (31) in accordance with the tilting of the movable side portion (Ss) when the lock release holding member (31) is in the operation position. 31), characterized that you have have a member (50) back forcibly rotated in the inoperative position, the vehicle seat. The seat cushion (S) has a cushion body (Sm) and a movable side portion (Ss) provided on the side of the seat surface of the cushion body (Sm), and the cushion body (Sm) has a movable side portion (Ss) A vehicle seat supported so as to be movable between an upright position (U) standing up with respect to the cushion main body (Sm) and a tilted position (D) tilted from the upright position (U),
A lock which is provided between an operation input portion (34) capable of arbitrary operation input, the cushion main body (Sm) and the movable side portion (Ss), and which can lock the movable side portion (Ss) to the upright position (U) A lock mechanism (L) capable of switching between an operating state and an unlockable lock release state; biasing means (10) for biasing the movable side portion (Ss) toward the standing position (U); A holding member (15) for holding the lock mechanism (L) in the lock operation state, and the lock mechanism (L) is activated in conjunction with the operation input unit (34) being operated and L) is switched to the unlocked state and provided with an unlocking holding mechanism (LL ′) that allows the locking mechanism (L) to automatically return to the locked state when not operated;
After the operation input unit (34) is operated and input while the movable side portion (Ss) is held at the standing position (U), the movable side portion (Ss) is movable side portion (Ss) From the upright position (U) in response to the application of a predetermined downward load on the
The lock mechanism (L) is provided on a latch (7r ') with a locking groove (14) provided on either one of the cushion main body (Sm) and the movable side portion (Ss), and on the other of them. And a locking member (13) which can be disengaged from the locking groove (14), and when the locking member (13) is locked in the locking groove (14), the lock is activated and When the lock of the lock member (13) is released in response to an operation input to the operation input unit (34), the lock release state is established, and the lock release holding mechanism (LL ') A lock release holding member (31 ') which is activated according to an operation input to the operation input unit (34) in a state where the movable side portion (Ss) is locked at the standing position (U) by the mechanism (L). ) And its lock solution The holding member (31 ') is characterized by engaging with the locking member (13) so as to block the locking member (13) from entering into the locking groove (14) in the operating state of the holding member (31') It shall be the multiplication product sheet. The lock release holding mechanism (LL) is connected to the lock mechanism (L) and is in the first operation position when the lock mechanism (L) is in the lock operation state, and is in the second operation position when in the lock release position. The lock release holding member (31) further includes a link mechanism (33) located in each of the lock mechanisms (33) when the lock release holding member (31) is in the first operation position. A first engagement portion (36a) to be engaged and a second engagement portion (36b) to engage the engaged portion (39) of the link mechanism (33) in the second operation position; and having a vehicle seat according to claim 1. A guide portion (36g) for guiding the engaged portion (39) to move from one of the first and second engagement portions (36a, 36b) to the other on the lock release holding member (31). The vehicle seat according to claim 3 , wherein the vehicle seat is provided. The lock so as to be able to hold the lock release holding member (31) in an engaged state with the engaged portion (39) of the first and second engaging portions (36a, 36b) thereof. A holding spring (35) for biasing the release holding member (31) is connected, and the guide portion (36g) is guided by the guide portion (36g) and the engaged portion (39) is the first, the first and the second. In the middle of moving from one of the two engaging portions (36a, 36b) to the other, the biasing mode of the holding spring (35) is engaged with one of the first and second engaging portions (36a, 36b). Switching top portion (36 gt) for switching from a mode in which the engaging portion (39) is engaged and held to a mode in which the engaged portion (39) is engaged and held in the other of the first and second engaging portions (36a, 36b) A vehicle seat according to claim 4 , characterized in that A holding spring (35) is disposed on one side of a vertical plane passing through the pivot axis with respect to the movable side portion (Ss) of the lock release holding member (31), and the first and second engagements on the other side. 6. A vehicle seat according to claim 5 , characterized in that couplings (36a, 36b) and said guides (36g) are respectively arranged. A return mechanism (R ′) for switching the lock release holding mechanism (LL ′) to the non-operation state according to the tilting of the movable side portion (Ss) when the lock release holding mechanism (LL ′) is in the operation state The vehicle seat according to claim 2 , characterized in that it comprises: Vehicle seat according to claim 2 or 7 , characterized in that said unlocking member (31 ') is arranged adjacent to said latch (7r'). The lock release holding member (31 ') can be engaged with the lock member (13) so as to prevent the lock member (13) from entering the lock groove (14) and locking the lock member (13). The movable member (Ss) is movable between the approach and the inoperative position which permits the locking, and the movable member (Ss) returns to the standing position (U) after the tilting; A vehicle according to any one of claims 2, 7 and 8 , characterized in that said lock release holding member (31 ') moves from said operative position to said inoperative position interlockingly with 13). Sheet. A return spring (96) capable of resiliently holding the lock release holding member (31 ') in the operating position is connected to the lock release holding member (31'), and the lock member (13) is engaged with the locking groove (14). In the stopped state, the lock release holding member (31 ') is engaged with the lock release holding member (31') so as to hold the lock release holding member (31 ') in the inoperative position against the elastic force of the return spring (96). The lock member (13) is unlocked from the locking groove (14) in conjunction with the operation input of the operation input portion (34) in the engaged state, and the lock release holding member (31 ') is released to allow the unlocking holding member (31') to move from the inoperative position to the operative position by the elastic force of the return spring (96), and the movable side portion (Ss) tilts from the standing position (U) and starts up again Locking so that the unlocking holding member (31 ') can be forcibly moved from the operating position to the inoperative position against the elastic force of the return spring (96) in the process of returning to the position (U) An interlock mechanism (R ') for linking the unlocking holding member (31') to the member (13) so as to be relatively slidable is provided between the locking member (13) and the unlocking holding member (31 ') The vehicle seat according to claim 9 . The movable side portion (Ss) is inclined from the standing position (U), and then the downward load acting on the movable side portion (Ss) is reduced to a predetermined value or less to the standing position (U). The vehicle seat according to any one of claims 1 to 10, characterized in that it automatically returns to a locked state. The vehicle seat according to any one of claims 1 to 11, wherein the movable side portion (Ss) is inclined further downward than the horizontal position when in the inclined position (D). . A side frame (Fs, Fs ') which is a separate part from the cushion frame (Fm) is joined to a cushion frame (Fm) which is a framework of the cushion main body (Sm), and the side frame (Fs, Fs') ) (8) so that the movable side portion (Ss) can be pivoted between the upright position (U) and the inclined position (D), the side frames (Fs, Fs') and the movable side The vehicle seat according to claim 1 or 2 , wherein a lock mechanism (L) capable of locking the movable side portion (Ss) in the upright position is provided between the portions (Ss). At least a part of the cushion frame (Fm) is composed of a wire-like frame (5, 5 '), and a portion of the wire-like frame (5, 5') exposed from the outer surface of the cushion body (Sm) Vehicle seat according to claim 13 , characterized in that the side frames (Fs, Fs') are fastened to 5a, 5b, 5c). A support wall (W) for supporting a support for the movable side (Ss) to the side frame (Fs, Fs') is integrally erected on the side frame (Fs), and the cushion frame ( The vehicle according to claim 13 or 14 , wherein the support wall (W) is fastened to a portion (5a, 5b, 5c) of the Fm) exposed from the outer surface of the cushion body (Sm). Sheet. The at least one portion (6f, 6m, 6r) of the support wall (W) functions as a pad position restricting portion that abuts on the pad portion (1) of the cushion main body (Sm). The vehicle seat according to 15 . A position where the cushion frame (Fm) is offset from the bottom plate frame (B) of the movable side portion (Ss) to the front side or the rear side of the movable side portion (Ss) on the mounting wall (6rw) connected to the support wall (W) 17. A vehicle seat according to claim 15 or 16 , characterized in that it is fastened at. In the support wall (W), the movable side portion (Ss) and a relief portion attached to the movable side portion (Ss) to avoid interference with a member rotating together with the movable side portion (Ss) Vehicle seat according to any of the claims 15 to 17 , characterized in that (6fk, 6rk) are formed. The support wall portion (W) has at least an enclosure wall portion (6f, 6m, 6r) surrounding a pivot support portion of the movable side portion (Ss) to the side frame (Fs). The vehicle seat according to any one of claims 15 to 18 . The surrounding wall portion (6f, 6m, 6r) of the supporting wall portion (W) is accommodated in a recess (1a) formed in the outer side portion of the pad portion (1) of the cushion main body (Sm) A vehicle seat according to claim 19 , which is assumed to be. A side frame (Fs, Fs ') which is a separate part from the cushion frame (Fm) is joined to a cushion frame (Fm) which is a framework of the cushion main body (Sm), and the side frame (Fs, Fs') ) (8) so that the movable side portion (Ss) can be pivoted between the upright position (U) and the inclined position (D), the side frames (Fs, Fs') and the movable side Between the parts (Ss), a lock mechanism (L) capable of locking the movable side part (Ss) in the upright position is provided, and the return member (50) is provided so as to protrude on the side frame (Fs) to, vehicle seat according to any one of claims 1 and 3-6. At least a part of the cushion frame (Fm) is composed of a wire-like frame (5 '), and the wire-like frame (5') is a plate at a portion (5c) exposed from the cushion body (Sm) outer surface -Shaped side frame mounting members (70) are coupled, characterized in that the side frames (Fs ') are mounted to the wire-like frame (5') via the side frame mounting members (70) Item 13. A vehicle seat according to item 13 . Wherein the lower side of the side frame mounting member (70), characterized in that the side frame support member capable of supporting a portion of the load from the side frame (Fs') (71) is arranged, according to claim 22 Vehicle seat as described in. The vehicle seat according to claim 23 , characterized in that the side frame attachment member (70) is sandwiched between the side frame (Fs') and the side frame support member (71).

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