WO2016021273A1 - Vehicle seat - Google Patents

Abstract

Provided is a vehicle seat in which a seat cushion has a cushion body and a movable side section, the movable side section being supported by the cushion body so as to be movable between an upright position and a tilted-down position. A seat (A) is provided with an operation input section (34) into which an operation input can be arbitrarily applied. After an operation input is applied to the operation input section (34) while the movable side section (Ss) of the seat (A) is held in an upright position (U), the movable side section (Ss) tilts down from the upright position (U) in response to a predetermined downward load being applied to the movable side section (Ss). That is, after an operation input is applied to the operation input section while the movable side section is held in the upright position, even if a hand is released from the operation input section, the movable side section can be held in the upright position in such a manner that the movable section can tilt down as needed, and consequently, operability is increased.

Description

Vehicle seat

The present invention provides a vehicle seat, particularly a seat cushion, having a cushion body and a movable side portion provided on the side of the seating surface of the cushion body, and the movable side portion of the cushion body stands up against the cushion body. The present invention relates to a vehicle seat that is supported so as to be movable between a standing position and a tilted position tilted from the standing position.

As the vehicle seat, for example, between the cushion main body and the movable side portion, a standing holding lock that can be switched between a lock operating state in which the movable side portion is locked in the standing position and the tilted position and a lock releasing state in which the lock is released. A vehicle seat provided with a mechanism and a tilt holding lock mechanism is known (see Patent Document 1 below).

In this conventional automobile seat, the movable side portion of the seat cushion is normally locked and held in the standing position so that the occupant's holdability can be kept good, while the occupant is on the seat cushion on the entrance / exit side. When the vehicle is moved laterally and gets off, the lock mechanism for standing and holding is unlocked, and the movable side portion in the standing state is manually tilted so that the movable side portion does not interfere with getting off.

Japanese Unexamined Patent Publication No. 10-86706

In the above-mentioned automobile seat, when the occupant tries to get off while the movable side portion is locked in the standing position, the operation of unlocking the standing holding lock mechanism and the tilting movable side portion are manually tilted. Therefore, there is a problem that the operation is troublesome for the passengers to get off the vehicle quickly.

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

In order to achieve the above object, the present invention provides a seat cushion having a cushion main body and a movable side portion provided on a side of a seating surface of the cushion main body, and the movable side portion on the cushion main body includes the cushion main body. A vehicle seat supported so as to be able to move between a standing position standing up against the tilted position and a tilting position tilted from the standing position. After the operation input unit is operated with the movable side portion held in the standing position, the movable side portion tilts from the standing position in response to a predetermined downward load acting on the movable side portion. Is the first feature.

According to the present invention, in addition to the first feature, after the movable side portion is tilted from the standing position, the downward load acting on the movable side portion is reduced according to a decrease in a predetermined value or less. A second feature is that the device automatically returns to the position and becomes locked.

Further, in addition to the first or second feature, the present invention is provided between the cushion body and the movable side portion, and is provided with a lock operation state in which the movable side portion can be locked in an upright position and unlocking that cannot be locked. A lock mechanism that can be switched to a state, an urging means that urges the movable side portion toward the upright position, a holding member that holds the lock mechanism in a lock operation state, and locks the lock mechanism during operation. And a lock release holding mechanism that allows the lock mechanism to switch back to the release state and allow the lock mechanism to automatically return to the lock operation state when it is not in operation. The third feature is that the operating state is linked to the above.

According to the present invention, in addition to the third feature, a return mechanism that switches the unlocking holding mechanism to a non-operating state in response to the tilt of the movable side portion when the unlocking holding mechanism is in an operating state. The fourth feature is that it is provided.

According to the present invention, in addition to the fourth feature, the unlocking holding mechanism is pivotally supported by the movable side portion and interlocked with the locking mechanism, so that the locking mechanism is switched and held in the unlocked state. And an unlocking holding member that can rotate between an operating position that allows the locking mechanism to automatically return to the locked operating state, and the return mechanism includes the unlocking holding member. A return member that abuts against the unlocking holding member and forcibly rotates the unlocking holding member to the inoperative position as the movable side portion tilts when the member is in the operating position; This is a fifth feature.

According to the present invention, in addition to the fifth feature, the lock release holding mechanism is linked to the lock mechanism and is in the first operation position when the lock mechanism is in the lock operation state, and in the lock release position. In some cases, the lock mechanism further includes a link mechanism positioned at the second operation position, and the lock release holding member engages the engaged portion of the link mechanism at the first operation position. According to a sixth aspect of the present invention, there is provided a coupling portion and a second engagement portion that engages the engaged portion of the link mechanism when in the second operating position.

Further, according to the present invention, in addition to the sixth feature, the unlocking holding member guides the movement of the engaged portion from one of the first and second engaging portions to the other. The seventh feature is that the above is provided.

Further, according to the present invention, in addition to the seventh feature, the unlocking holding member can hold the engaged state of the first and second engaging portions with the engaged portion. A holding spring that biases the unlocking holding member is connected to the guide portion, and the engaged portion is moved from one of the first and second engaging portions to the other by the guide of the guide portion. The biasing mode of the holding spring is changed from the mode in which the engaged portion is engaged and held to one of the first and second engaging portions to the other of the first and second engaging portions. An eighth feature is to have a switching top portion for switching to a mode in which the portion is engaged and held.

According to the present invention, in addition to the eighth feature, a holding spring is provided on one side of the vertical plane passing through the rotation axis of the unlocking holding member with respect to the movable side portion, and the first side is provided on the other side. A ninth feature is that the first and second engaging portions and the guide portion are respectively disposed.

Further, according to the present invention, in addition to the third or fourth feature, the lock mechanism includes a latch with a locking groove provided in one of the cushion main body and the movable side portion, and one of the latches. And a locking member that can be engaged with and disengaged from the locking groove. When the locking member is locked to the locking groove, the locking operation state is established, and an operation input to the operation input unit is performed. When the locking member is released, the unlocking state is established, and the unlocking holding mechanism is moved to the operation input portion in a state where the movable side portion is locked in the standing position by the locking mechanism. An unlocking holding member that is activated in response to an operation input is provided so that the unlocking holding member prevents entry and locking of the locking member into the locking groove in this operating state. Tsu and tenth aspect that engages the click member.

In addition to the tenth feature of the present invention, the eleventh feature is that the unlocking holding member is disposed adjacent to the latch.

According to the present invention, in addition to the tenth or eleventh feature, the lock release holding member engages with the lock member so as to prevent the lock member from entering and locking into the lock groove. Is movable between an operating position to be obtained and a non-operating position permitting entry and locking, and is interlocked with the lock member when the movable side portion returns to the standing position after the tilting. The twelfth feature is that the unlocking holding member moves from the operating position to the inoperative position.

According to the present invention, in addition to the twelfth feature, the lock release holding member is connected to a return spring capable of elastically holding it in the operating position, 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 resilient force of the return spring. In conjunction with the operation input, the locking member is unlocked from the locking groove and releases the unlocking holding member, and the unlocking holding member is moved from the inoperative position to the operating position. The movable side portion tilts from the standing position and returns to the standing position again, and the lock release holding member is resisted against the resilient force of the return spring. The operating position A thirteenth feature is that an interlocking mechanism is provided between the lock member and the unlocking holding member so that the unlocking holding member is linked to the locking member so as to be capable of relative sliding so that the locking member can be forcibly moved to the inoperative position. .

According to the present invention, in addition to the first feature, a side frame which is a separate part from the cushion frame is coupled to a cushion frame which is a skeleton of the cushion body, and the movable side portion is mounted on the side frame. A fourteenth feature is provided with a lock mechanism that can pivot between the standing position and the tilting position and can lock the movable side portion to the standing position between the side frame and the movable side portion. And

According to the present invention, in addition to the fourteenth feature, at least a part of the cushion frame is configured by a wire frame, and the side frame is exposed to a portion of the wire frame exposed from the outer surface of the cushion body. It is the 15th characteristic to be fastened.

According to the present invention, in addition to the fourteenth or fifteenth feature, a support wall portion that supports a shaft support portion of the movable side portion to the side frame is integrally provided on the side frame, and the cushion A sixteenth feature is that the support wall portion is fastened to a portion of the frame exposed from the outer surface of the cushion body.

Further, in addition to the sixteenth feature, the present invention has a seventeenth feature in which at least a part of the support wall portion functions as a pad position restricting portion that contacts the pad portion of the cushion body.

According to the present invention, in addition to the sixteenth or seventeenth feature, the cushion frame is offset to the vehicle front side or the rear side from the bottom plate frame of the movable side portion on the mounting wall portion connected to the support wall portion. The eighteenth feature is that it is fastened at the above position.

According to the present invention, in addition to any one of the sixteenth to eighteenth features, the support wall portion is attached to the movable side portion and the movable side portion and rotates together with the movable side portion. A nineteenth feature is that an escape portion is formed to avoid interference with a member.

According to the present invention, in addition to any one of the sixteenth to nineteenth features, the support wall portion has at least a surrounding wall portion surrounding a shaft support portion of the movable side portion to the side frame. Is a twentieth feature.

In addition to the twentieth feature, the present invention has the twenty-first feature that the enclosure wall portion of the support wall portion is accommodated in a recess formed in an outer portion of the pad portion of the cushion body. .

In addition to any one of the fifth to ninth features, the present invention is such that a side frame that is a separate component from the cushion frame is coupled to a cushion frame that is a skeleton of the cushion body, and the side frame A pivot mechanism is provided on the movable side portion so that the movable side portion can be rotated between the standing position and the tilting position, and between the side frame and the movable side portion, the movable side portion can be locked in the standing position, The twenty-second feature is that the return member protrudes from the side frame.

According to the present invention, in addition to the fourteenth feature, at least a part of the cushion frame is formed of a wire-like frame, and a plate-like side is formed on a portion of the wire-like frame exposed from the outer surface of the cushion body. According to a twenty-third feature, a frame attachment member is coupled, and the side frame is attached to the wire frame via the side frame attachment member.

According to the twenty-fourth aspect of the invention, in addition to the twenty-third feature, a side frame support member capable of supporting a part of the load from the side frame is disposed below the side frame attachment member. Features.

In addition to the twenty-fourth feature, the present invention has a twenty-fifth feature in which the side frame attachment member is sandwiched between the side frame and the side frame support member.

According to the first feature of the present invention, the movable side portion is operated in response to a predetermined downward load acting on the movable side portion after the operation input portion is operated and input while the movable side portion is held in the standing position. Therefore, after the operation input part is operated, the movable side part can be held in the standing position in a state where it can be tilted at any time even if the hand is released from the operation input part. Since the movable side portion does not need to be specifically tilted to tilt the movable side portion from that state, the operability as a whole is excellent. That is, when an occupant sitting on the cushion body is about to get off, the movable side part can be automatically tilted by the occupant's weight by simply inputting the operation input part, so that the operability is improved. As a result, it is possible to prevent the movable side portion from obstructing the occupant's dismounting operation, so that the occupant can get off quickly and easily without being obstructed by the movable side portion.

According to the second feature of the present invention, after the movable side portion tilts from the standing position, the movable side portion automatically returns to the standing position in response to the downward load acting on the movable side portion being reduced to a predetermined value or less. Since the locked state is established, the movable side portion can be automatically returned to the standing position as the occupant leaves after the tilting of the movable side portion, and the operability is further improved.

Further, according to the third feature of the present invention, normally, the movable side portion is locked and held in the upright position by a lock mechanism, so that the occupant's holdability can be kept good, and from this state to the operation input portion. Based on the operation input, the lock release holding mechanism can be operated to switch and hold the lock mechanism in the unlocked state. Even in this unlocked holding state, the movable side portion can be temporarily held in the standing position by the biasing means, but when the occupant on the cushion body tries to move laterally from this state, the movable side portion is kept at the weight of the occupant. It can be tilted without difficulty against the biasing means.

Further, according to the fourth feature of the present invention, the return mechanism switches the lock release holding mechanism to the non-actuated state in accordance with the tilting of the movable side portion. The movable side part is automatically raised by the urging means, and when it reaches the standing position, the lock mechanism is in the lock operation state, so that the movable side part can be automatically returned to and held in the standing position. As a whole, the operability is excellent. Furthermore, since the tilt holding lock mechanism for locking the movable side portion at the tilt position can be omitted, the structure can be simplified accordingly.

According to the fifth aspect of the present invention, when the movable side portion is tilted from the standing position according to the lateral movement of the occupant, the unlocking holding member of the unlocking holding mechanism in the operating state and the return mechanism return Only by mechanically engaging the member, the unlocking holding mechanism can be mechanically interlocked with the tilting operation of the movable side portion and switched to the non-operating state, so that the switching structure is simple.

According to a sixth aspect of the present invention, the engaged portion of the link release mechanism interlocked with the lock mechanism is connected to the first and second engagement portions of the lock release holding member of the mechanism. The lock release holding mechanism can be accurately held in the operating state and the non-operating state with a simple configuration that is selectively engaged with each other.

According to a seventh aspect of the present invention, the unlocking holding member is provided with a guide portion that guides the movement of the engaged portion of the link mechanism from one of the first and second engaging portions to the other. Since it is provided, the unlocking holding mechanism can be smoothly switched between the operating state and the non-operating state without difficulty.

According to the eighth aspect of the present invention, the engagement state of the first and second engaging portions with the engaged portion can be held by a single holding spring, and thus the structure is simple. The unlocking holding mechanism can be accurately held in the operating state and the non-operating state.

According to the ninth aspect of the present invention, the holding spring is provided on one side of the vertical plane passing through the rotation axis with respect to the movable side portion of the unlocking holding member, and the first and second sides are provided on the other side. Since the engaging portion and the guide portion are respectively arranged, the lock release holding mechanism can be configured compactly while avoiding the mutual interference between the holding spring and the link mechanism without difficulty.

According to the tenth feature of the present invention, the lock release holding member is engaged with the lock member so as to prevent the lock member from entering and locking into the locking groove in the activated state. The lock release holding member can be directly linked to the lock release holding member, the structure of the lock release holding member can be simplified and reduced in size, and the increase in size of the lock release holding mechanism can be effectively suppressed.

According to the eleventh feature of the present invention, since the unlocking holding member is disposed adjacent to the latch of the locking mechanism, the holding force of the unlocking holding member can be efficiently transmitted to the locking member. The structure can be simplified and reduced in size.

According to a twelfth feature of the present invention, the unlocking holding member is provided with an operating position where the lock member can be engaged with the lock member so as to prevent the lock member from entering and engaging, and the entry and engagement. When the movable side portion returns to the standing position after tilting, the unlocking holding member is interlocked with the locking member from the operating position to the inoperative position. Therefore, when the tilted movable side part returns to the standing position, the unlocking holding member can be automatically returned to the inoperative position with a simple interlocking structure using the locking member.

According to the thirteenth feature 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 locking groove of the latch. Therefore, the movable side portion can be normally locked in the standing position without being disturbed by the unlocking holding member. Further, in conjunction with the operation input of the operation input unit in the locked state, the lock member is released from the engagement with the engagement groove and releases the lock release holding member. Since the elastic force of the return spring moves from the inoperative position to the activated position, the unlocked holding state can be easily obtained according to the operation input to the operation input unit. Further, in the process in which the movable side part tilts from the standing position and returns to the standing position again, an interlocking mechanism that links the unlocking holding member to the locking member so as to be able to slide relative to each other is used to make the unlocking holding member the elastic force of the return spring It can be forced to move from the operating position to the non-operating position. As a result, even if the unlocking holding member has a simple arrangement structure that is separated and independent from the transmission path between the operation input unit and the locking mechanism, the unlocking holding member is linked to the locking member to prevent the unlocking holding member from being moved. Since the switching operation between the operating positions can be accurately performed, the structure and the size of the lock release holding mechanism can be further simplified.

According to the fourteenth feature of the present invention, the movable side part can be assembled together with the lock mechanism or the like on the side frame which is a separate part from the cushion frame which is the skeleton of the cushion body, It can be handled as a small assembly, that is, a sub-assembly. As a result, the cushion frame on the cushion body side can be reduced in size, and the movable side portion can be easily and quickly and accurately attached to the cushion body simply by coupling the side frame of the small assembly previously assembled to the cushion frame. Assembling becomes possible and it can greatly contribute to productivity improvement. In addition, even when changing the shape and size of the movable side part by changing the model, etc., it is only necessary to change the side frame, which is a small part, and there is no need to change the cushion body (cushion frame), which is a large part. It is possible to suppress changes to simple changes and it is easy to deal with them.

According to the fifteenth feature of the present invention, at least a part of the cushion frame is formed of a wire frame, and the side frame is fastened to a portion of the wire frame exposed from the outer surface of the cushion body. The wire-shaped frame having excellent moldability can easily form the side frame fastening portion in the cushion frame, and can also increase the degree of freedom in selecting the formation position.

According to the sixteenth feature of the present invention, the support wall portion that supports the shaft support portion of the movable side portion to the side frame is integrally provided on the side frame, and is exposed from the outer surface of the cushion body of the cushion frame. Since the support wall portion is fastened to the portion, the support wall portion that supports the shaft support portion of the movable side portion also serves as a fastened portion on the side frame side with respect to the cushion frame, and the structure can be simplified accordingly.

According to the seventeenth feature of the present invention, at least a part of the support wall portion functions as a pad position restricting portion that comes into contact with the pad portion of the cushion body, so that the support wall that supports the shaft support portion of the movable side portion. The part also serves as a pad regulating means, and the structure can be simplified accordingly.

According to the eighteenth feature of the present invention, the cushion frame is fastened to the mounting wall portion provided continuously with the support wall portion at a position offset from the bottom plate frame of the movable side portion toward the vehicle front side or the rear side. In performing the operation of fastening the side frame to the cushion frame at the fastening portion, it is possible to effectively avoid the obstruction of the movable side portion, thereby improving workability.

According to a nineteenth feature of the present invention, the support wall portion includes a movable side portion and a relief portion attached to the movable side portion to avoid interference with a member that rotates together with the movable side portion. Since it is formed, interference with the support wall portion can be suppressed when the movable side portion is moved.

According to the twentieth feature of the present invention, the support wall portion has a surrounding wall portion surrounding the shaft supporting portion to the side frame of the movable side portion, so that the shaft supporting portion is effectively reinforced by the surrounding wall portion. And can be protected.

According to the twenty-first feature of the present invention, since the surrounding wall portion of the support wall portion is accommodated in a recess formed in the outer portion of the pad portion of the cushion body, the support wall portion is located outside the cushion body. Can be avoided, and contribute to downsizing of the seat.

According to the twenty-second feature of the present invention, since the return member protrudes from the side frame, the mechanism for automatically switching the unlocking holding mechanism to the non-operating state can be simplified, and the cost can be reduced. It can contribute to saving.

According to the twenty-third feature of the present invention, a plate-shaped side frame mounting member is coupled to a portion of the wire-shaped frame that constitutes a part of the cushion frame that is exposed from the outer surface of the cushion body. Since the side frame is attached to the wire-like frame, the side frame is easier to install than the case where the side frame is directly attached to the thin and winding wire-like frame, and the design freedom of the side frame and the wire-like frame is also increased. Get higher.

According to the twenty-fourth feature of the present invention, a 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 supporting strength of the side frame can be increased while suppressing.

According to the twenty-fifth feature of the present invention, since the side frame mounting member is sandwiched 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. Can be increased.

1A and 1B are perspective views of a main part of an automobile seat to which the present invention is applied, in which FIG. 1A shows a state in which a movable side portion is in an upright position, and FIG. 1B shows that the movable side portion is separated from a cushion body. It is a figure which shows the state which fractured | ruptured a part of cushion main body, 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 as seen from the direction of arrow 3 in FIG. (First embodiment) 4 is a bottom view as seen from the direction of arrow 4 in FIG. (First embodiment) 5A and 5B are longitudinal sectional views (sectional view taken along line 5-5 in FIG. 4) of the lock mechanism in a state where the movable side portion is in the standing position, in which FIG. 5A shows a locked state and FIG. 5B shows a locked state. It is a figure which shows each cancellation | release state. (First embodiment) FIG. 6 is an exploded perspective view of the main part of the lock mechanism as viewed obliquely from above. (First embodiment) 7A and 7B are explanatory views of the operation of the unlocking holding mechanism. FIG. 7A shows the non-operating state of the unlocking holding mechanism, and FIG. 7B shows how the unlocking holding mechanism is switching from the non-operating state to the operating state. The state is shown, (C) is a diagram showing the operating state of the lock release holding mechanism. (First embodiment) FIG. 8 is an operation explanatory view corresponding to FIG. 2 showing the interrelationship between the operation of the movable side portion and the lock mechanism and the unlock release holding mechanism. FIG. 8A shows the lock operation state of the lock mechanism (the lock release hold mechanism). (B) is a state in which the lock release mechanism is unlocked by operating the unlocking holding mechanism while the movable side portion is in the standing position, and (C) is a state in which the movable side portion is slightly tilted from the standing position. FIG. 6 is a diagram showing a slightly inverted state (the lock release holding mechanism remains in an activated state). (First embodiment) FIG. 9 is an operation explanatory view corresponding to FIG. 2 showing the interrelationship between the operation of the movable side portion and the lock mechanism and the unlock release holding mechanism, and (D) further tilts the movable side portion from the slightly inverted position. The state immediately after the unlocking holding mechanism is switched to the non-operating state, (E) is the state in which the movable side portion is further tilted while the unlocking holding mechanism is in the non-operating state, and (F) is the occupant weight. It is a figure which shows the state (The lock release holding | maintenance mechanism is still a non-operation state) in which the released movable side part was automatically returned to the standing position, respectively. (First embodiment) 10A and 10B are perspective views (corresponding to FIG. 1) of an automobile seat to which the present invention is applied, in which FIG. 10A shows a state in which the movable side portion is in a standing position, and FIG. It is a figure which each shows the state which isolate | separated from the cushion main body and fractured | ruptured a part of cushion main body. (Second Embodiment) FIG. 11 is an exploded perspective view of the movable side portion of the automobile seat. (Second Embodiment) 12 is an enlarged cross-sectional view taken along line 12-12 of FIG. 10A, corresponding to FIG. (Second Embodiment) FIG. 13 is a partially broken side view corresponding to FIG. 3 as seen from the direction of arrow 13 in FIG. (Second Embodiment) 14 is an enlarged cross-sectional view taken along line 14-14 of FIG. 13 corresponding to FIG. 4, and shows 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) FIG. 15 is an enlarged cross-sectional view taken along line 14-14 of FIG. 13 corresponding to FIG. 4, and shows a state where the operating lever is in the operating position and the lock mechanism is in the unlocked holding state. (Second Embodiment) FIG. 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 in FIG. (Second Embodiment) FIG. 18 is an exploded perspective view of the main parts of the lock mechanism and the lock release holding mechanism as viewed obliquely from below. (Second Embodiment) FIG. 19 is a corresponding cross-sectional view of FIG. 17, in which (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), and (B) is the operation lever. It is a figure which shows the state which the lock release holding | maintenance mechanism was in the operation state according to the operation input. (Second Embodiment) FIG. 20 is a cross-sectional view corresponding to FIG. 17, and FIG. 20 (C) shows a state in which the movable side portion is slightly tilted from the state of FIG. ) Is a diagram showing a state in which the movable side portion has further tilted to reach the tilted position. (Second Embodiment) FIG. 21 is a corresponding cross-sectional view of FIG. 17, and (E) shows a state in which the unlocking holding member is slightly lifted by the upper surface of the locking member and is rotated upward by the upright rotation after the movable side portion is tilted, (F) is a figure which shows the state which the locking member of the locking mechanism began to latch into a latching groove | channel by further raising a movable side part from the state of (E). (Second Embodiment) FIG. 22 is a partial correspondence diagram of FIG. 13 showing a modification of the return spring with respect to the operation lever. (Second Embodiment)

A ... Seat D ... Tilt position L ... Lock mechanism LL, LL '... Unlocking holding mechanism S ... Seat cushion Sm ... Cushion body Ss ... Moving side part R ... Return mechanism R '... Interlock mechanism (return mechanism)
U ... Standing position W ... Support wall 1 ... Cushion pad (pad part) for cushion body
1a... Recess 5... Wire- like frame 5a, 5b, 5c .. Exposed portion 6f of wire-like frame...
6m ・ ・ ・ ・ Intermediate wall (part of support wall, enclosure wall)
6r ··· rear wall (part of support wall, enclosure wall)
6rw: mounting wall 6fk, 6rk, .. relief 7r '... rear latch (latch)
8 ... Axis (axial support)
10 ... Return spring (biasing means)
13 ··· Lock member 14 ··· Locking groove 15 ··· Lock spring (holding member)
31, 31 '... Unlocking holding member 33 ... Link mechanism 34 ... Operation lever (operation input unit)
35... Holding spring 36 a... First engaging portion 36 b... Second engaging portion 36 g... Guide portion 36 gt.
50 ··· Return member 8 ··· pivot (axial support)
50 ··· return member 70 ··· side frame mounting member 71 ··· side frame support member 96 ··· return spring

Next, an embodiment of the present invention will be described based on the embodiment shown in the accompanying drawings. In the present specification, front and rear, and right and left 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 passengers installed on the floor of a four-wheeled vehicle, and a seat cushion S for seating the butt of the passenger, and the seat cushion. The seat back SB stands upward from the rear end portion of the S and supports the back of the occupant.

Referring to FIGS. 2 to 5 together, the seat cushion S is disposed on the cushion body Sm whose upper surface is the seat surface, and on the side of the seat surface of the cushion body Sm (the left and right entrances in the illustrated example). The movable body Sm is divided into a pair of left and right movable side portions Ss, and each movable side portion Ss of the cushion body Sm is tilted from the standing position U and the standing position U with respect to the cushion body Sm. It is attached so that it can move between each of the tilt positions D. Further, between the cushion body Sm and the movable side portion Ss, a lock mechanism L is provided that can be switched between a lock operation state in which the movable side portion Ss can be locked in the standing position U and an unlock state in which the movable side portion Ss cannot be locked.

In the illustrated example, the movable side portion Ss is raised upward with respect to the cushion body Sm when the movable side portion Ss is in the upright position U. However, in the present invention, the movable side portion Ss is in the upright position. When it is in U, it does not necessarily have to protrude upward from the cushion body Sm. For example, it may be substantially the same height as the cushion body Sm.

The cushion body Sm includes a cushion frame Fm serving as a skeleton of the cushion body Sm, and a cushion pad 1 for a cushion body as a pad portion supported by the cushion frame Fm. The surface of the cushion pad 1 is leather or synthetic. It is covered with a skin 2 made of leather. Further, a side frame Fs, which is a separate component from the cushion frame Fm, is coupled to both left and right ends of the cushion frame Fm, and a movable side portion Ss positioned above the side frame Fs is 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-shaped frame 5 is a rigid frame formed by bending a rod-shaped metal frame over a substantially entire area of the cushion main body Sm into a predetermined shape corresponding to the contour shape, and most of the wire-shaped frame 5 is formed in the cushion pad 1. Buried. A part of the wire-like frame 5 is exposed from the left and right side surfaces of the cushion body Sm, and the side frame Fs is detachably fastened to the exposed portions 5a and 5b. In addition, if at least a part of the cushion frame Fm is constituted by the wire-like frame 5 and the side frames Fs are fastened to the portions 5a and 5b of the wire-like frame 5 exposed from the outer surface of the cushion body, the moldability is improved. The excellent wire-like frame 5 has an advantage that the side frame fastening portion in the cushion frame Fm can be easily formed, and the degree of freedom in selecting the formation position is increased.

The movable side portion Ss includes a bottom plate frame B constituting the bottom wall thereof, and a movable side portion cushion pad 3 fixedly supported on the bottom plate frame B. In the cushion pad 3, In cooperation with the bottom plate frame B, a reinforcing frame (not shown) serving as a skeleton of the movable side portion Ss 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 made of a substantially triangular plate corresponding to the shape of the bottom of the movable side portion Ss, and a substantially rectangular lock mechanism support that is superposed on the lower surface of the bottom plate frame main body Bm. Frame B1. The lock mechanism support frame Bl has a two-layered structure including an upper frame plate 20 integrally provided with a downward flange portion 20f on the outer periphery, and a lower frame plate 21 superposed on the lower surface of the upper frame plate 20. Composed.

On 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 rotate between the standing position U and the tilted position D. Next, the structure of the shaft support will be described.

That is, on the upper surface of the side frame Fs, a substantially U-shaped support wall portion W is erected integrally with the front and rear walls 6f and 6r and an intermediate wall 6m integrally connecting them. The intermediate wall 6m is integrally provided with front and rear hinge walls 7f and 7r that are parallel to each other. Before and after that, a pivot 8 is installed and fixed between the rear hinge walls 7f and 7r. The pivot 8 is connected to the bottom plate frame B (particularly, the lower frame plates 20 and 21 constituting the lock mechanism support frame Bl). The extension collars 20a and 21a extending integrally from the side edge on the cushion body Sm side are fitted and connected to a bearing collar 22 sandwiched between the extension collars 20a and 21a. The upper and lower frame plates 20 and 21 are respectively formed with shallow raised portions 23 for reinforcement that extend over the regions of the extension plate portions 20a and 21a and the other regions.

Thus, the support wall portion W has the surrounding wall portion including the front, rear walls 6f and 6r and the intermediate wall 6m so as to surround the side frame Fs shaft support portion of the movable side portion Ss. The shaft support portion can be effectively reinforced and protected by the surrounding wall portions 6f, 6m, and 6r. In addition, the surrounding wall portions 6f, 6m, and 6r are accommodated in a recess 1a that is open on the lower surface formed on the outer surface of the cushion pad 1 of the cushion main body Sm in the illustrated example. The sheet S can be made compact by avoiding overhanging to the outside of Sm. In this case, since at least a part of the surrounding wall portions 6f, 6m, and 6r of the support wall portion W functions as a pad position restricting portion that comes into contact with the cushion pad 1 of the cushion body Sm, the shaft of the movable side portion Ss. The support wall portion W that supports the support portion also serves as the pad regulating means, and the structure can be simplified accordingly.

Furthermore, a part of the support wall portion W (for example, the front and rear walls 6f and 6r of the enclosure wall portion) is attached to the movable side portion Ss and the movable side portion Ss and rotates together with the movable side portion Ss (described later). Notched relief portions 6fk and 6rk are formed to avoid interference with the lock release holding mechanism LL. Thereby, when rotating the movable side part Ss, there is no fear that the support wall part W becomes an obstacle, and workability | operativity is improved.

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

Further, a mounting wall portion 6rw extending rearward is fixed to the rear wall 6r of the support wall portion W, and the front portion of the mounting wall portion 6rw and the second portion exposed from the outer surface of the cushion body Sm of the cushion frame Fm. 5b is fastened by bolts b and nuts n at positions offset from the bottom plate frame B of the movable side portion Ss to one side in the vehicle front-rear direction (rear side in the illustrated example). Due to the offset effect of the fastening portion, it is possible to effectively prevent the movable side portion Ss from interfering when performing the work of fastening the side frame Fs to the cushion frame Fm, thereby improving workability.

Further, between the side frame Fs and the bottom plate frame B, a return spring 10 as an urging means for urging and energizing the movable side portion Ss toward the standing position U is interposed. In the illustrated example, the return spring 10 is constituted by a torsion coil spring that surrounds a spring support shaft 9 provided 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 other end of the frame B is engaged with one of the front and rear hinge walls 7f and 7r. Accordingly, the movable side portion Ss is elastically held at the standing position U by the elastic force of the return spring 10 in the free state. As a means for assisting the urging force by the return spring 10, for example, at least one auxiliary spring (not shown) can be used as necessary. In this case, each auxiliary spring includes the side frame Fs and the bottom plate frame B. In between, the return spring 10 is interposed in parallel.

Incidentally, between the side frame Fs and the bottom plate frame B, a lock mechanism L that can lock the movable side portion Ss (bottom plate frame B) in the standing position U is interposed. Next, the configuration of the locking mechanism L will be described with reference to FIGS.

The lock mechanism L is supported by the lock mechanism support frame Bl so as to be slidable back and forth between a predetermined stroke, that is, between a predetermined lock position (solid line in FIG. 4) and an unlock position (chain line in FIG. 4). A pair of locking members 13 having first engaging portions 13a that respectively engage with the pair of fork-like engaging portions 12a of the lock bar 12 and interlocking with the lock bar 12, and a second of the lock member 13 The front and rear hinge walls 7f and 7r can be engaged with and disengaged from the engaging portion 13b. The pair of locking grooves 14 and the lock bar 12 are elastically held on the lock position side (left side in FIG. 4). 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 tensile state. Thus, the front and rear hinge walls 7f and 7r with the locking groove 14 function as a latch to which the lock member 13 can be engaged and disengaged.

The lower frame plate 21 of the bottom plate frame B is provided with a guide wall portion that slides and guides the lock bar 12 by cutting up a part of the lower frame plate 21. The locking groove 14 includes a first groove portion 14a that is wide and shallow in the circumferential direction, and a deep second groove portion 14b that is recessed in the bottom surface of one end of the first groove portion 14a.

The lock member 13 is rotatably connected to and supported by the lock mechanism support frame B1 via the pivot shaft 16, and a lock operation position where the second engagement portion 13b enters and locks into the second groove portion 14b (the solid line in FIG. 4). 5A) and the lock inoperative position where the second groove 14b cannot be locked and remains in the first groove 14a (see the chain line in FIG. 4 and FIG. 5B). It can be turned around 16. The elastic force of the lock spring 15 constantly urges 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, so that the rotation range of the lock member 13 is limited to a predetermined range. The rotation range of the movable side portion Ss is limited. Further, the lock member 13 is arranged so as to face the second groove portion 14b only when the movable side portion Ss is in the standing position U, and the lock member 13 can be turned 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 brought into the standing position U by the rotation restriction of the lock member 13. Locked.

In addition, the bottom plate frame B of the movable side portion Ss switches and holds the lock mechanism L in the unlocked state against the lock spring 15 of the lock mechanism L during operation, and the lock mechanism L repels the lock spring when not in operation. An unlocking holding mechanism LL that allows automatic return to the lock operating state by force is provided. Next, the configuration of the lock release holding mechanism LL will be described.

The lock release holding mechanism LL is linked to the lock mechanism L to switch and hold the lock mechanism L in the unlocked state (that is, the state where the second engagement portion 13b of the lock member 13 is disengaged from the second groove portion 14b). Non-operation that allows the position (FIG. 7C) and the lock mechanism L to automatically return to the lock operation state (that is, the state where the second engagement portion 13b of the lock member 13 is engaged with the second groove portion 14b). The lock release holding member 31 that can rotate between the positions (FIG. 7A), and the first operating position (FIG. )), And when in the unlocked position, the link mechanism 33 located in the second operating position (FIG. 7C) and the operation linked to the link mechanism 33 to arbitrarily operate the unlocking holding mechanism LL. Input section And an operation lever 34 in. The unlocking holding member 31 is pivotally supported by a 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. The second bracket 32 is fixedly connected to the second bracket 32.

In other words, the unlocking holding member 31 is pivotally supported by one side wall extension of the first bracket 30 via the pivot 29 so as to be rotatable around a horizontal axis, and passes vertically through the rotation axis. A connecting portion with the holding spring 35 is disposed on the first half 31A on one side of the front and rear sides across the surface, and first and second engagements described later are provided on the second half 31B on the other side of the front and rear. Joint portions 36a and 36b are disposed. The holding spring 35 has a spring fixing end connected to the side wall extension of the first bracket 30 and elastically urges the unlocking holding member 31 in a predetermined direction (clockwise in FIG. 7).

The link mechanism 33 has first and second bases pivotally supported by the first and second brackets 30 and 32 spaced apart in the front and rear directions so that the base ends can rotate about the horizontal axis via the pivots 27 and 28, respectively. Two links 37 and 38 are provided. The ends of the links 37 and 38 are connected to each other so as to be rotatable about a horizontal axis via a pivot 26, and the first and second engagements of the unlocking holding member 31 are connected to the shaft end of the pivot 26. A switching holding pin 39 as an engaged portion that can be engaged with the joint portions 36a and 36b is integrally connected.

The switching holding pin 39 is engaged 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), and the unlocking holding mechanism. LL is held in a non-operating state, and when the link mechanism 33 is in the second operating position (FIG. 7C), it engages with the second engaging portion 36b of the unlocking holding member 31 to hold the unlocking. The mechanism LL is held in an operating state. 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 about the axis of the pivot 27 by pivotally connecting and supporting the pivot 27 integrally connected to the base end of the first link 37 to the first bracket 30. The base 27 of the operation lever 34 is coupled to the pivot 27 so that it can rotate integrally. When the lock mechanism L is in the lock operation state shown in the solid line in FIG. 4 and FIGS. 5A and 7A, the operation lever 34 is in the non-operation position shown in the solid line in FIG. The link mechanism 33 is moved from the first operating position (FIG. 7A) to the intermediate position against the resilient force of the holding spring 35 and the lock spring 15 by operating upward from the operating position indicated by the same chain line. It can be manually operated to the second operating position (FIG. 7C) via (FIG. 7B). A recess for receiving the operation portion of the operation lever 34 is formed on the outer surface of the movable side portion Ss.

Further, the second half 31B of the unlocking holding member 31 is located at an intermediate position between the first and second engaging portions 36a and 36b, and the switching holding pin 39 slides from one to the other. A guide part 36g having a mountain shape in side view to be guided is formed. The guide portion 36g has a switching top portion 36gt whose top surface is rounded and rises in the middle of the guide portion 36g. When the switching holding pin 39 gets over the switching top portion 36gt, the switching holding pin 39 is During the movement from one of the first and second engaging portions 36a and 36b to the other, the biasing mode 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. The mode of holding together can be switched to a mode of engaging and holding the switching holding pin 39 on the other of the first and second engaging portions 36a and 36b.

Further, between the side frame Fs and the unlock release holding mechanism LL, when the unlock release holding mechanism LL is in an operating state, the unlock release holding mechanism LL is inactivated according to the downward rotation of the movable side portion Ss, that is, the tilt. A return mechanism R for switching to the state is provided.

The return mechanism R includes a return member 50 that protrudes upward from the side frame Fs, and an engagement arm that is connected to the lower end of the second half 31B of the unlocking holding member 31 corresponding to the return member 50. 31Ba. The return member 50 has a downward rotation amount of a predetermined amount in a process in which the movable side portion Ss is rotated downward in a state where the unlocking holding member 31 is in the operating position (FIG. 7C). When it reaches, it comes into contact with the engagement arm 31Ba of the unlocking holding member 31 and forcibly rotates the unlocking holding member 31 to the inoperative position (FIG. 7A). Further, the return member 50 is formed with a smoothly curved relief portion 50a so as to avoid interference with the unlocking holding member 31, and the engagement arm 31Ba of the unlocking holding member 31 is specially provided by the relief portion 50a. In the process in which the movable side portion Ss further pivots downward after engaging the return member 50, mutual interference between the lock release holding member 31 and the return member 50 can be avoided without difficulty.

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

In addition, the left and right ends of the cushion body Sm can always cover the lock mechanism L, the unlock release holding mechanism LL, the side frame Fs, etc. immediately below the movable side portion Ss, both in the form of standing and tilting. A flexible cover 60 (see FIG. 1A) is stretched. In place of such a flexible cover 60, other appropriate covering means, for example, a cover body standing on a floor frame (for example, a side sill) of a vehicle body, a lock mechanism L, an unlocking holding mechanism LL, a side The frame Fs or the like may be covered. In addition, 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 be a floor frame (for example, a side sill) of the vehicle body or a fixed installation object thereon. You may make it fix with adhesion | attachment or other suitable fixing means, and in this case, the downward extension part of the outer 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, the movable side portion Ss of the seat cushion S is in a standing position U slightly raised from the upper surface of the cushion body Sm as shown in FIG. 1 (A), FIG. 8 (A), etc. The standing posture of the movable side portion Ss is reliably held by the lock mechanism L in the lock operation state. Therefore, the holdability of the occupant sitting on the seat cushion S is enhanced by the movable side portion Ss in the standing state. As shown in the solid line in FIG. 4, the lock operation state is such that the lock bar 12 elastically urged toward the lock position by the lock spring 15 holds the lock member 13 in the engagement position with the second groove 14b. The movable side portion Ss (bottom plate frame B) is held by restricting the rotation. Further, in this lock operation state, the lock release holding mechanism LL is in an inactive state, that is, in the position shown in FIG. It is engaged and held by the joint portion 36a.

From this state, when an occupant sitting on the seat cushion S is going to get off, first, the operation lever 34, and thus the link member 37, is manually rotated by a predetermined angle. As a result, the link mechanism 33 of the lock release holding mechanism LL is displaced to the state shown in FIG. 7C through FIG. 7B, and at this time, the switching holding pin 39 resists the elastic force of the holding spring 35. The slide part moves from the engaging part 36a to the second engaging part 36b through the guide part 36g, and at that time, the unlocking holding member 31 rotates clockwise in FIG. At the same time, the lock bar 12 is pulled to the unlocked position against the elastic force of the lock spring 15, and the lock member 13 interlocked with the towing is rotated to the unlocked position (chain line in FIG. 4). As shown in FIG. 5B, the locking groove 14 is detached from the second groove 14b. Thus, even when the movable side portion Ss is held at the standing 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.

Next, when the occupant gets out of this state, the weight acts on the movable side portion Ss as a downward load, so that the movable side portion Ss gradually moves downward against the elastic force of the return spring 10. As shown in FIGS. 8 (C) to 9 (D), the lock release holding mechanism LL is switched from the operating state to the non-operating state when it is slightly tilted. That is, when the movable side portion Ss is rotated downward by a predetermined angle (that is, to a predetermined rotation position before the tilt position D), the engagement arm 31Ba of the lock release holding member 31 is engaged with the return member 50 of the return mechanism R. To do. In conjunction with the engagement, the unlocking holding member 31 rotates counterclockwise in FIG. 7 against the elastic force of the holding spring 35, and the switching holding pin 39 is in the second engagement, contrary to the previous time. The slide part moves from the part 36b to the first engaging part 36a through the guide part 36g and returns to the position shown in FIG. In this state, the lock bar 12 is released from the lock release holding mechanism LL, so that the lock bar 12 attempts to automatically return to the lock position side by the elastic force of the lock spring 15 and interlocks with this, the lock member 12 13 also attempts to automatically return to the lock position side (that is, the position where it is locked in the second groove 14b). However, at this time, the second engaging portion 13b of the lock member 13 is in sliding contact with the first groove 14a, but is not in a position facing the second groove 14b, and therefore cannot be locked to the second groove 14b.

Such an inoperative state of the unlocking holding mechanism LL continues until the occupant passes through the movable side portion Ss and the weight does not act on the movable side portion Ss. Until then, the movable side portion Ss rotates downward. Is allowed (FIG. 9E).

Next, when the occupant passes through the movable side portion Ss and the weight does not act on the movable side portion Ss, the movable side portion Ss is automatically activated by the elastic force of the return spring 10 as shown in FIG. The lock mechanism L is locked at the same time as it reaches the standing position U, that is, the second engaging portion 13b of the locking member 13 is locked in the second groove 14b. 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 shown by the solid line in FIG. 13 to the upper operation position shown by the chain line while the movable side portion Ss is held at the standing position U. After that, the occupant's weight (that is, a predetermined downward load) is applied to the movable side portion Ss in accordance with the tilt from the standing position U. After the inclination, the downward load applied to the movable side portion Ss is a predetermined value. It is configured to automatically return to the standing position U in accordance with the decrease in the following and enter a locked state, and such a basic operation is the same as that of the first embodiment.

However, in the second embodiment, in the structure of the side frame Fs ′, the mounting structure thereof to the cushion body Sm, the lock release holding mechanism LL ′, the interlocking connection structure between the lock mechanism L and the operation lever 34, etc. This is different from the first embodiment. Next, the differences will be described mainly. Note that the components of the second embodiment that have the same structure and function as the components of the first embodiment are given the same reference numerals as those of the first embodiment, and the specific structure and function are described. Is omitted.

That is, in the second embodiment, as in the first embodiment, the seat cushion S is divided into a cushion body Sm and a pair of left and right movable side portions Ss, and each cushion side Sm includes each movable side portion. Ss is attached so as to be able to rotate between the standing position U (solid line in FIG. 12) and the tilting position D (same chain line), and between the cushion main body Sm and the movable side part Ss, the movable side part Ss. Is provided with a lock mechanism L that can be switched between a lock operation state that can be locked to the standing position U and a lock release state that cannot be locked.

A side frame Fs ′, which is a separate component, is coupled to the left and right ends of the cushion frame Fm, which is the skeleton of the cushion body Sm, and the movable side portion Ss is rotatably attached to the side frame Fs ′. . The side frame Fs ′ is U-shaped 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 both front and rear end portions of the intermediate pipe portion 80m via downward bent portions. The frame main body 80 constructed as described above has a main portion, and the front and rear pipe portions 80f and 80r of the frame main body 80 are integrally joined to the front and rear end portions of the bent plate-like mounting plate 81 by a connecting means such as welding. Combined. The mounted plate 81 is provided with a plurality of weld nuts 82 and corresponding bolt insertion holes 81h.

The intermediate pipe portion 80m performs the same function as the pivot 8 of the side frame Fs of the first embodiment, and is located between the upper and lower frames 20, 21 of the bottom plate frame B in the movable side portion Ss (specifically Are fitted and connected so as to be rotatable between the extension plate portions 20a and 21a) integrally extending from the side edge on the cushion body Sm side. As described above, the bottom frame B of the movable side portion Ss is pivotally supported on the side frame Fs ′ via the intermediate pipe portion 80m serving as a pivot, and the movable side portion Ss is placed in the upright position U and the tilted position D around the pivotal support portion. And can be rotated between.

In addition, the intermediate pipe portion 80m is integrally connected to the front and rear latch walls 7f 'and 7r' in front of the side frame Fs and the rear hinge walls 7f and 7r of the first embodiment by connecting means such as welding. The front and rear latches 7f 'and 7r' have a locking groove 14 similar to the locking groove 14 of the first embodiment. Thus, the front and rear latches 7 f ′ and 7 r ′ and the mounted 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 overlapped with the bottom plate frame main body Bm made of a substantially triangular single plate corresponding to the bottom shape of the movable side portion Ss and the bottom surface of the bottom plate frame main body Bm. The lock mechanism support frame Bl is composed of a welded generally rectangular lock mechanism, and the lock mechanism support frame Bl has a two-layer structure including an upper frame plate 20 and a lower frame plate 21 superposed on its lower surface. However, in the second embodiment, the upper frame plate 20 is enlarged in a generally triangular shape corresponding to the shape of the bottom of the movable side portion Ss, so that the bottom plate frame main body Bm of the first embodiment is omitted, and the large size thereof. A bottom plate frame B having a two-layer structure is obtained by caulking and bonding 85 between the upper frame plate 20 and the lower frame plate 21 at a plurality of locations. That. Instead of the caulking connection 85, a welding means may be used as in the first embodiment. Also, between the side frame Fs ′ and the bottom plate frame B, a return spring 10 as an urging means for elastically urging the movable side portion Ss toward the standing position U is interposed as in the first embodiment. However, the mounting structure of the return spring 10 is the same as that of the first embodiment.

As is clear 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 side surfaces of the cushion body Sm, and the exposed part 5c is a flat surface. It is formed in a U-shape when viewed. The exposed portion 5c is integrally coupled with three sides of a side frame mounting member 70 formed in a bent plate shape so as to overlap with the lower surface of the mounting plate 81 of the side frame Fs' by a connecting means such as welding. Is done. The side frame Fs 'is detachably attached to the exposed portion 5c of the wire-like frame 5' via the side frame attachment 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 mounting member 70. The side frame support member 71 is manufactured by integral molding of synthetic resin, is formed in a shape substantially corresponding to the movable side portion Ss in plan view, and functions as a cover that covers the lower surface of the movable side portion Ss. . At least a part of the bottom wall portion 71a of the side frame support member 71 has a lower surface shape that can come into surface contact with the upper surface of the floor frame 100 of the vehicle body (the inclined upper surface 100a in the illustrated example).

Thus, the downward load from the movable side portion Ss is basically supported by the cushion frame Fm via the side frame mounting member 70, but part of the load is supported by the side frame mounting member 70 and the side frame. The floor frame 100 can also be distributed and supported via the member 71. A plurality of reinforcing ribs 71r are erected vertically and horizontally on the upper surface of the bottom wall portion 71a of the side frame support member 71, and the rib intersection portion and the bottom wall portion 71a are provided at the vertical and horizontal rib intersection portions. A mounting boss portion 71b is integrally formed.

A side frame mounting member 70 is vertically sandwiched between the side frame supporting member 71 and the mounted plate 81 of the side frame Fs ′, and the three members 71, 81, 70 can be attached and detached with a plurality of bolts 73. It is tightened together. For the joint fastening, the bolt 73 is inserted into the mounting boss portion 70b of the side frame support member 71 from below, and the bolt insertion holes 70h, 81h of the side frame mounting member 70 and the mounted plate 81 are further inserted. It penetrates and is screwed and tightened to a weld nut 82 on the mounted plate 81.

In addition, referring also to FIGS. 14 to 18, the lock mechanism L that can lock the movable side portion Ss to the standing position U is provided in the bottom plate frame B in the front-rear direction, similarly to the lock mechanism L of the first embodiment. A pair of lock members 13 that are slidably supported, a pair of lock members 13 that have a first engagement portion 13a that can be engaged with the lock bar 12 so as to be capable of relative rotation, The front and rear latches 7 f ′ and 7 r ′ with the engaging groove 14 that can be engaged and disengaged with the second engagement portion 13 b of the lock member 13, and the lock members 13 through the lock bar 12 are locked (that is, the second engagement portion). A lock spring 15 serving as a holding member is provided that elastically holds the joint portion 13b on the side of the engaging groove 14 where the engaging groove 14 is engaged with the second groove portion 14b. The configurations and functions of the lock bar 12, the lock member 13, the locking groove 14, and the lock spring 15 are the same as those in the first embodiment.

Also in the second embodiment, the lock mechanism L is unlocked against the lock spring 15 of the lock mechanism L during operation (that is, the second engagement portion 13b is detached from the second groove portion 14b of the locking groove 14). In a non-operating state, and the lock mechanism L automatically returns to the lock operating state (that is, the state in which the second engaging portion 13b is engaged with the second groove portion 14b) by the elastic force of the lock spring 15. An allowable lock release holding mechanism LL ′ is provided. In particular, in the second embodiment, the lock release holding member 31 ′ is a transmission path between the operation lever 34 and the lock mechanism L (that is, a link mechanism 33 ′ described later). It is different from the first embodiment in that it is not directly linked, but is attached to the side frame Fs ′ independently from the transmission path and directly linked to the lock member 13. Next, the configuration of the lock release holding mechanism LL ′ will be described.

The unlocking holding mechanism LL ′ is pivotally supported on the bottom plate frame B so as to be rotatable about the horizontal axis Ph, and rotates between a non-operation position (solid line in FIG. 13) and an operation position above it (same chain line). An operation lever 34 that can be moved and operated, a link mechanism 33 ′ that interlocks and connects the operation lever 34 and the lock mechanism L, and the operation lever 34 in a state in which the movable side portion Ss is locked to the standing position U by the lock mechanism L. And an unlocking holding member 31 'that is activated in response to an operation input to the operation position side. In this operating state, the unlocking holding member 31 'enters and locks the locking member 13 into the locking groove 14 (specifically, the second engaging portion 13b enters and locks into the second groove 14b). ) Can be engaged with the lock 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 a linear motion of the lock bar 12, so that the operation input of the operation lever 34 (that is, toward the operation position side). The lock bar 12 can be slid in the unlocking direction against the lock spring 15 in conjunction with the movement of the bottom plate frame B around the horizontal axis Ph. The second link is a first link 91 that rotates integrally with the operation lever 34, and a second crank crank shaft whose intermediate portion is pivotally supported on the bottom plate frame B about the vertical axis Pv and whose one end 92 a is interlocked with the first link 91. The link 92 is divided. The other end 92b of the second link 92 and the lock bar 12 are either a long hole 92h provided in one of them (the other end 92b in the illustrated example) or the other (in the illustrated example, on the side of the lock bar 12). They are interlocked and connected to each other via an interlocking connecting mechanism comprising pins 12p provided on the projecting link receiving portion 12c).

Further, between the bottom plate frame B and the operation lever 34 or the first link 91, the operation lever 34 is moved in the non-operation position side (that is, clockwise in FIG. 13) as clearly shown in FIGS. A return spring 90 capable of starting and holding is interposed. The return spring 90 is formed of a torsion coil spring that surrounds the horizontal axis Ph. One end of the return spring 90 is locked to the bottom plate frame B, and the other end is locked to the operation lever 34 or the first link 91. The bottom plate frame B is provided with stopper means 93 that 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.

Note that the return spring of the operation lever 34 is interposed between the bottom plate frame B and the first link 91, for example, as shown in FIG. A mounted tension spring 90 'may be used.

The distal end portion 91a of the first link 91 is bent convexly toward the second link 92, and is relatively slidable against one end portion 92a of the second link 92 bent convexly toward the first link 91. 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. Accordingly, in response to the operation lever 34 being rotated from the non-operation position to the operation position, the first link 91 moves the lock bar 12 against the lock spring 15 via the second link 92 in the unlocking direction ( A sliding operation can be performed in the right direction in FIGS. Since the link mechanism 33 'has such a link configuration and the lock release holding member 31' is separated and independent from the link mechanism 33 'as will be described later, it is possible to avoid the link mechanism 33' from being bulky in the vertical direction as much as possible. This is advantageous in reducing the size of the movable side portion Ss in the vertical direction.

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

Further, between the unlocking holding member 31 ′ and the rear latch 7 r ′, a torsion coil spring surrounding the pivot 95 is provided to elastically bias the unlocking holding member 31 ′ toward the operating position. A return spring 96 is provided. A stopper 98 that can hold the unlocking holding member 31 ′ in the operating position against the elastic force of the return spring 96 is integrally projected on the side surface of the rear latch 7 r ′. The stopper 98 engages with the intermediate protrusion 31C ′ of the unlocking holding member 31 ′ when the unlocking holding member 31 ′ is in the operating position, and exceeds the operating position with respect to the unlocking holding member 31 ′. Rotation is restricted so that there is no rotation.

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

Further, when the operation lever 34 is operated and input to the operation position side in the engaged state, the lock bar 12 interlocked with the operation lever 34 via the link mechanism 33 ′ slides in the unlocking direction, and the lock bar 12 is moved to the lock bar 12. The interlocking lock member 13 releases the locking with respect to the locking groove 14 (that is, the second engagement portion 13b is disengaged from the second groove portion 14b), so that the lock mechanism L enters the unlocked state and the inoperative position. The unlocking holding member 31 ′ is released. With the release, the unlocking holding member 31 ′ is rotated by the elastic force of the return spring 96 from the previous inoperative position to the operating position, whereby the unlocking holding member 31 ′ is moved to the position shown in FIGS. As shown in B), the lock mechanism L is held in the unlocked state.

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

Further, between the lock member 13 and the unlocking holding member 31 ′, the unlocking holding member 31 ′ is used as the elastic force of the return spring 96 in the process in which the movable side portion Ss tilts from the standing position U and returns to the standing position U again. An interlocking mechanism R ′ that links the lock release holding member 31 ′ to the lock member 13 so as to be capable of relative sliding is provided so that the lock member 13 can be forcibly moved from the operation position to the non-operation position. In the illustrated example, the interlocking mechanism R ′ includes a guide surface 99c having an arcuate cross section that smoothly connects the lower surface of the distal end portion 31B ′ of the unlocking holding member 31 ′ and the stopper surface 94, and the guide surface 99c. It is comprised by the end surface 13bs and the upper surface 13bt of the 2nd engaging part 13b of the lock member 13 which can be slidably contacted. Thus, the interlocking mechanism R ′ is a return mechanism of the present invention that switches the unlocking holding mechanism LL ′ to the non-operating state according to the tilt of the movable side portion Ss when the unlocking holding mechanism LL ′ is in the operating state. Configure.

In addition, the left and right ends of the cushion body Sm are flexible enough to cover the lock mechanism L, the lock release holding mechanism LL, the side frame Fs, and the like immediately below the movable side portion Ss, both when the movable side portion Ss stands and when it tilts. Sex cover is stretched. As the flexible cover, in this embodiment, a lower extension 4a of the skin 4 of the cushion pad 3 of the movable side portion Ss is used, and the lower extension 4a is a floor frame 100 of the vehicle body or a fixed installation object thereon. Alternatively, it is fixed to the outer surface of the side frame support member 71 by appropriate fixing means.

For example, in the present embodiment, a plurality of hook-shaped elastic clips 87 are sewn or bonded to the free end portion of the lower extension 4a of the skin 4 at intervals. Then, the clip 87 is detachably locked to the inner edge of the bottom wall portion 71a of the side frame support member 71 in a state where the lower extension portion 4a wraps around the lower surface of the side frame support member 71 as shown in FIG. Let As the fixing means, instead of the clip 87, a rubber string or the like that is sewn to the free end of the lower extension 4a and presses the free end against the outer surface of the side frame support member 71. It may be used. In addition, as a flexible cover, you may use a special cover, without utilizing the downward extension part 4a of the outer skin 4. FIG.

Next, the operation of the second embodiment will be described. In the normal use state of the seat A, as shown in FIGS. 12, 16, and 17, the movable side portion Ss of the seat cushion S is in the standing position U, and the standing posture of the movable side portion Ss is in the lock operation state. Locked by the locking mechanism L. As in the first embodiment, the lock operating state is such that the lock bar 12 that is elastically biased toward the lock position by the lock spring 15 holds the lock member 13 in the engagement position with the second groove 14b and is movable. It is held by restricting the rotation of the side portion Ss. In this locked state, the lock member 13 is engaged with the unlocking holding member 31 ′ so as to hold the unlocking holding member 31 ′ in the inoperative position against the elastic force of the return spring 96. (See FIG. 17) This places the unlocking holding mechanism LL in a non-actuated state.

From this state, when the passenger sitting on the seat cushion S is about to get off, first, the operator 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 elastic force of the lock spring 15 via the link mechanism 33 'of the unlocking holding mechanism LL. As shown in FIGS. 15 and 19A, the lock member 13 releases the lock with respect to the lock groove 14 (that is, the second engagement portion 13b is separated and retracted from the second groove portion 14b), and the lock mechanism L is released. Is unlocked. At the same time, the lock member 13 releases the lock release holding member 31 ′ in the inoperative position, so that the lock release holding member is released along with the release and retraction of the second engagement portion 13 b from the second groove portion 14 b. 31 'is rotated downward by the elastic force of the return spring 96 from the previous non-operating position to the operating position (FIG. 17 → FIG. 19 (A) → (B)). The lock release holding member 31 ′ can switch and hold the lock mechanism L to the lock release state when LL is in the activated state.

In this unlocked holding state, the unlocking holding member 31 ′ has the second engagement when the stopper surface 94 of the tip end portion 31 B ′ abuts the end surface 13 bs of the second engaging portion 13 b of the lock member 13. The part 13b is prevented from entering and locking into the second groove part 14b. Therefore, even if the operator releases the hand from the operation lever 34 in this state and the lever 34 automatically returns to the non-operation position by the elastic force of the return springs 90 and 90 ', FIG. 15 and FIG. The lock release holding state of the lock mechanism L shown in FIG. Even when the lock mechanism L is in the unlocked holding state as described above, the movable side portion Ss is temporarily held at the standing position U by the elastic force of the return spring 10.

Next, from this state, when the occupant actually gets out of the vehicle, the movable side portion Ss resists the return spring 10 in response to the weight acting on the movable side portion Ss as a predetermined downward load. As shown in FIG. 20 (C), the lock release holding mechanism LL ′ is switched from the operating state to the non-operating state when it is slightly tilted. That is, when the movable side portion Ss is rotated downward by a predetermined angle, the end surface 13bs of the second engagement portion 13b of the lock member 13 that follows and descends downward is below the stopper surface 94 of the lock release holding member 31 ′. It slides around the lower portion of the guide surface 99c (that is, it does not face the stopper surface 94). As a result, the lock release holding member 31 ′ cannot enter or lock the second engagement portion 13 b into the second groove portion 14 b even when it is in the operating position, that is, the lock release holding mechanism. LL 'is deactivated. However, even when the lock release holding mechanism LL ′ is in an inoperative state, the second engagement portion 13b of the lock member 13 is in contact with the shallow first groove portion 14a of the engagement groove 14, and the engagement groove 14, the second engagement portion 13 b does not enter and lock into the second groove portion 14 b (that is, the lock mechanism L is locked). In addition, the lock release holding member 31 'does not return to the inoperative position.

When the movable side portion Ss further pivots downward from this state, the lock member 13 moves down leaving the lock release holding member 31 ′. When the second engagement portion 13b of the lock member 13 is engaged with the lower end of the first groove portion 14a as shown in FIG. 20D, the lowering of the movable side portion Ss is inclined to the tilt position D (that is, the lowering). Limited).

Next, when the occupant passes through the movable side portion Ss and its 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. And At this time, as shown in FIG. 21E, the lock member 13 that rises following the movable side portion Ss engages and slides the upper surface 13bt of the second engagement portion 13b with the guide surface 99c of the lock release holding member 31 ′. When it comes into contact, it tries to lift the unlocking holding member 31 'from below. Then, when the second engaging portion 13b rises to a position facing the second groove portion 14b of the locking groove 14, the second engaging portion 13b is locked while sliding the upper surface 13bt on the guide surface 99c of the unlocking holding member 31 '. The elastic force of the spring 15 causes the second groove portion 14b 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 operation state and mechanically interlocks with the lock member 13 of the lock mechanism L. Thus, the unlocking holding member 31 'automatically returns from the operating position to the non-operating position. Accordingly, the lock release holding mechanism LL ′ activated by the operation input of the operation lever 34 is automatically deactivated mechanically in conjunction with the movement of the movable side portion Ss (particularly the lock member 13) in the above process. Therefore, it is not necessary to perform a special operation for returning the lock release holding mechanism LL ′ to the non-operating state.

In the first and second embodiments described above, the lock mechanism L is switched and held in the unlocked state during operation, and the lock release holding mechanism that allows the lock mechanism L to automatically return to the lock operating state during non-operation. LL and LL ′ are provided, and the lock release holding mechanisms LL and LL ′ can be switched from the non-operating state to the operating state in conjunction with an operation input to the operation lever 34.

Thus, after the movable lever Ss is locked and held at the upright position U and the operation lever 34 is operated to the operation position, the lock mechanism L is switched and held in the unlocked state. Thus, the movable side portion Ss automatically tilts from the standing position U according to the occupant's weight (predetermined downward load) acting thereon. Therefore, after the operation lever 34 is operated to the operation position side, the movable side portion Ss can be held at the standing position U in a state where it can be tilted at any time even when the operation lever 34 is released. Therefore, in order to tilt the movable side portion Ss from that state, it is not necessary to perform a special tilting operation on the movable side portion Ss, and the operability is improved. That is, when the occupant on the cushion body Sm is about to get off, the operation lever 34 is simply operated and input to the operation position side, and the movable side portion Ss cannot be pushed by the occupant's weight without performing a special tilting operation thereafter. Since the movable side portion Ss can be prevented from obstructing the occupant's dismounting operation while improving the operability, the occupant is not obstructed by the movable side portion Ss. It is possible to get off quickly and easily.

In addition, 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 accordance with the downward rotation of the movable side portion Ss. After the side portion Ss is tilted from the standing position U, the movable side portion Ss is moved to the standing position U by the elastic force of the return spring 10 as the downward load acting on the movable side portion Ss decreases below a predetermined value. Automatically return to. Accordingly, since the lock mechanism L returns to the lock operation state, the movable side portion Ss that has returned to the standing position U can be automatically locked, and the operability is further improved because there is no need to perform a special lock operation. In addition, the occupant's holdability is ensured by the movable side portion Ss locked to the standing position U during traveling. In addition, since the tilt holding lock mechanism for locking the movable side portion Ss at the tilt position D can be omitted, the seat structure can be simplified accordingly.

Further, in the first and second embodiments, the movable side portion Ss is placed on the side frames Fs and Fs ′ which are separate parts from the cushion frame Fm which is the skeleton of the cushion main body Sm, and the lock mechanism L and the lock release holding mechanisms LL and LL ′. Etc., so that they can be handled as a single subassembly, that is, a sub-assembly. Accordingly, not only can the cushion frame Fm on the cushion body Sm side be reduced in size, but also the movable side portion can be obtained by simply coupling the side frames Fs and Fs ′ of the small assembly assembled in advance to the cushion frame Fm in a separate line. Since Ss can be easily and quickly assembled to the cushion body Sm with high accuracy, productivity can be improved and cost can be reduced. Further, even when the shape or size of the movable side portion Ss is changed by changing the model, etc., it is only necessary to change the side frames Fs and Fs ′ which are small parts, and the cushion body including the cushion frame Fm which is a large part. It is possible to suppress the change of Sm to an unnecessary or minor change, and it is possible to easily cope with the change and to reduce the cost.

Temporarily, the cushion frame Fm is extended outward from the cushion body Sm, 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. Etc., not only the cushion frame Fm, which is the skeleton of the cushion body Sm, is enlarged, but also the movable side portion Ss needs to be directly assembled to the cushion body Sm (cushion frame Fm), which is a large component. If the shape and size of the movable side portion Ss is changed by changing the model or the like, it is a large part corresponding to complicating the assembly process and making it difficult to ensure the assembly accuracy. There is a problem that the cushion body Sm (cushion frame Fm) itself needs to be changed and is not easily changed. However, if the side frames Fs and Fs ′, which are separate parts from the cushion frame Fm, are employed as in the present embodiment and the movable side portion Ss is assembled thereto, these problems can be solved all at once.

In particular, in the first embodiment, when the movable side portion Ss is rotated downward from the standing position U when getting off, the unlocking holding member 31 of the unlocking holding mechanism LL in the activated state, and the return member 50 of the return mechanism R Since the lock release holding member 31 can be turned from the operating position to the non-operating position and the lock release holding mechanism LL can be switched to the non-operating state by simply engaging the switch, the switching structure is simple. In addition, the switching operation is reliably performed. In addition, in the first embodiment, the switch holding pin 39 that is the engaged portion of the link mechanism 33 that is interlocked and connected to the lock mechanism L of the lock release holding mechanism LL is connected to the first and second engagements of the lock release holding member 31. The lock release holding mechanism LL can be accurately held in the operating state and the non-operating state with a simple configuration that is selectively engaged with the portions 36a and 36b. In addition, the unlocking holding member 31 is provided with a guide portion 36g for guiding the engaged portion of the link mechanism from one to the other of the first and second engaging portions 36a and 36b. The unlocking holding mechanism can be smoothly and smoothly switched between the operating state and the non-operating state.

Furthermore, the lock release holding member 31 of the first embodiment is provided with the lock release holding member 31 so that the engagement state of the first and second engaging portions 36a and 36b with the switching holding pin 39 can be held. The holding spring 35 to be urged 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, 36b to the other by the guide thereof. From a mode in which the switching holding pin 39 is engaged and held in one of the first and second engaging portions 36a and 36b, the switching holding pin 39 is engaged in the other of the first and second engaging portions 36a and 36b. Since the switching top portion 36gt for switching to the holding mode is provided, the engagement state of the first and second engaging portions 36a, 36b with the switching holding pin 39 can be held by the single holding spring 35, and therefore, simple The lock release holding mechanism 31 is structured. The respective accurately be held in a dynamic state and a non-operating state. Furthermore, a holding spring 35 is arranged on one side of the vertical plane passing through the pivot 29 of the unlocking holding member 31, and first and second engaging portions 36a, 36b and a guide portion 36g are arranged on the other side. Therefore, the lock release holding mechanism LL can be configured in a compact manner while avoiding the mutual interference between the holding spring 35 and the link mechanism 33 without difficulty.

Further, in particular, the lock release holding member 31 ′ of the second embodiment is engaged with the lock member 13 so as to prevent the lock member 13 from entering and locking into the locking groove 14 (second groove portion 14 b) in its operating position. The arrangement configuration can be matched. For this reason, since the lock release holding member 31 'can be directly linked to the lock member 13, not only can the structure of the lock release holding member 31' be simplified and reduced in size, but also the structure of the link mechanism 33 'can be simplified and simplified. It is possible to reduce the size, and it is possible to effectively prevent the lock release holding mechanism LL ′ from increasing in size as a whole. Moreover, since the unlocking holding member 31 ′ is disposed adjacent to the latch 7 r ′ of the locking mechanism L, the holding force of the unlocking holding member 31 ′ can be transmitted directly and efficiently to the locking member 13, and the unlocking holding member 31. The structure of ′ can be simplified and reduced in size.

Further, the lock release holding member 31 ′ of the second embodiment has an operation position where the lock member 13 can be engaged with the lock member 13 so as to prevent the lock member 13 from entering and locking the locking groove 14 (second groove portion 14 b). When the movable side portion Ss returns to the standing position U after the tilting, it is interlocked with the lock member 13 that rises following the movable side portion Ss. Then, the unlocking holding member 31 'moves from the operating position to the non-operating position. Therefore, when the tilted movable side portion Ss returns to the standing position U by the resilient force of the return spring 10, the lock release holding member 31 'is automatically returned to the inoperative position with a simple interlocking structure using the lock member 13. Can be made.

In the second embodiment, the lock member 13 does not operate against the return spring 96 against the unlocking holding member 31 ′ when the lock member 13 is locked in the locking groove 14 (second groove portion 14 b) of the latch 7 r ′. Since the lock release holding member 31 ′ is engaged so as to be held in the position, the movable side portion Ss can normally be reliably locked at the standing position U without being disturbed by the lock release holding member 31 ′. Further, in conjunction with the operation input of the operation lever 34 to the operation position side in the locked state, the lock member 13 is released from the engagement with the engagement groove 14 and releases the lock release holding member 31 ′. As a result, the unlocking holding member 31 ′ is rotated downward from the inoperative position to the operating position by the elastic force of the return spring 96, so that the unlocked holding state can be easily obtained according to the operation input to the operation lever 34. It is done. 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 ′ that links the lock release holding member 31 ′ to the lock member 13 so as to be relatively slidable is provided with the lock release holding member. 31 'can be forcibly moved from the operating position to the non-operating position against the return spring 96. As a result, the lock release holding member 31 'has a simple arrangement configuration in which the lock release holding member 31' is separated and independent from the transmission path (that is, the link mechanism 33 ') between the operation lever 34 and the lock mechanism L. 'Can be linked directly to the lock member 13 so that the switching operation between the operating position and the non-operating position of the unlocking holding member 31' can be performed accurately, so that the structure of the unlocking holding mechanism LL 'can be further simplified. Downsizing and downsizing.

Furthermore, in the second embodiment, a plate-like side frame attachment member 70 is coupled to a portion 5c exposed from the outer surface of the cushion body Sm of the wire-like frame 5 constituting a part of the cushion frame Fm, and the side frame attachment Since the side frame Fs' is attached to the wire-like frame 5 via the member 70, the side frame Fs' can be easily attached as compared with the case where the side frame Fs' is directly attached to the thin and winding wire-like frame 5. The degree of freedom in designing Fs ′ and the wire-like frame 5 is also increased. Further, a side frame support member 71 capable of supporting a part of the load from the side frame Fs ′ is disposed below the side frame mounting member 70, so that the side frame Fs ′ is prevented from being enlarged while the side frame Fs ′ is not enlarged. It is possible to increase the support strength of Fs ′, and the side frame support member 71 also serves as a cover member that covers the lower side of the movable side portion Ss. Therefore, the structure can be simplified and the cost can be reduced. Moreover, since the side frame mounting member 70 is sandwiched and fixed between the side frame Fs ′ and the side frame support member 71, the support strength of the side frame Fs ′ can be increased while simplifying the support structure for the side frame Fs ′. Can be increased.

As mentioned above, although embodiment of this invention was described, this invention is not limited to that embodiment, A various embodiment is possible within the scope of the present invention.

For example, in the above-described embodiment, the vehicle seat of the present invention is applied to the rear seats of a four-wheel vehicle in two rows in the front and rear. However, in the present invention, each of the front seat and the three rows in the front and rear of a minivan type vehicle is shown. You may apply to a sheet. In addition to the four-wheeled vehicle, the vehicle on which the seat is mounted may be a three-wheeled vehicle, a bus, a truck, a railway vehicle, an aircraft, or the like.

In the above embodiment, the left and right sides of the cushion body Sm of the rear seat A (the entrance / exit side) are each provided with a pair of left and right movable side portions Ss adjacent to each other. However, in the present invention, the rear seat A The movable side portion Ss may be disposed on the inner side in the vehicle width direction of the left and right center sides of the cushion main body Sm, that is, in the vehicle width direction. In this case, by tilting the movable side portion Ss, There is an advantage that the lateral movement of the occupant between the right and left seat surfaces can be smoothly performed without being obstructed by the movable side portion Ss. Further, when the present invention is applied to a single seat, the movable side portion Ss is provided on at least one of the left and right sides (the entrance / exit side) and the other side (the vehicle width direction inner side) of the seat surface of the cushion body Sm. Is provided.

In the above-described embodiment, the operation input unit for arbitrarily operating the lock release holding mechanism LL is shown using the operation lever 34 that is directly operated and input manually (manually). The operation input unit may be configured by switch means that can generate power with an actuator such as an electric motor and output an operation command signal for the actuator.

In the above embodiment, the return mechanisms R and R ′ for switching the unlocked holding mechanisms LL and LL ′ in the activated state to the non-actuated state are mechanically interlocked with the downward rotation of the movable side portion Ss, that is, tilting. Although the release holding mechanisms LL and LL ′ are shown to be switched to the non-operating state, in the present invention, an actuator such as an electric motor that can forcibly switch the lock releasing and holding mechanisms LL and LL ′ to the non-operating state. In addition, detection means such as a sensor that detects the downward rotation of the movable side portion Ss or the upward rotation immediately after the downward rotation is used, and the upward rotation immediately after the downward rotation or the downward rotation of the movable side portion Ss is electrically used. The lock release holding mechanism LL may be switched to an inoperative state in conjunction with each other.

Claims (25)

1. The seat cushion (S) has a cushion main body (Sm) and a movable side portion (Ss) provided on the side of the seating surface of the cushion main body (Sm), and the cushion main body (Sm) has a movable side portion (Ss). In a vehicle seat supported so as to be able to move between a standing position (U) standing up with respect to the cushion body (Sm) and a tilting position (D) tilted from the standing position (U).
   It is equipped with an operation input unit (34) that allows arbitrary operation input,
   The movable side portion (Ss) is moved to the movable side portion (Ss) after the operation input portion (34) is operated with the movable side portion (Ss) held in the standing position (U). The vehicle seat is tilted from the standing position (U) in response to a predetermined downward load acting on the vehicle seat.
2. After the movable side portion (Ss) is tilted from the standing position (U), 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 claim 1, wherein the vehicle seat is automatically returned to a locked state.
3. It is provided between the cushion body (Sm) and the movable side part (Ss) and can be switched between a lock operation state in which the movable side part (Ss) can be locked in the standing position (U) and a lock release state in which the lock cannot be locked. A locking mechanism (L), a biasing means (10) for biasing the movable side portion (Ss) toward the standing position (U), and a mechanism for holding the locking mechanism (L) in a locked state. A holding member (15) and an unlocking holding mechanism that switches and holds the lock mechanism (L) in an unlocked state when operating, and allows the lock mechanism (L) to automatically return to the locked operating state when not operating. (LL, LL '), and the unlocking holding mechanism (LL, LL') is in an operating state in conjunction with the operation input of the operation input unit (34). Claim 1 or 2 For the mounting of the vehicle seat.
4. A return mechanism that switches the unlock release holding mechanism (LL, LL ') to an inactive state in response to the tilt of the movable side portion (Ss) when the unlock release holding mechanism (LL, LL') is in an activated state. The vehicle seat according to claim 3, further comprising (R, R ′).
   
5. The unlocking and holding mechanism (LL) is pivotally supported by the movable side portion (Ss) and connected to the locking mechanism (L) to switch and hold the locking mechanism (L) in the unlocked state. And an unlocking holding member (31) that can rotate between a non-operation position that allows the lock mechanism (L) to automatically return to the lock operation state, and the return mechanism (R) Is in contact with the unlocking holding member (31) as the movable side portion (Ss) is tilted when the unlocking holding member (31) is in the operating position. The vehicle seat according to claim 4, further comprising a return member (50) for forcibly rotating 31) to the inoperative position.
6. The unlocking holding mechanism (LL) is connected to the locking mechanism (L) and is in a first operating position when the locking mechanism (L) is in a locked operating state, and in a second operating position when in the unlocking position. And the unlocking holding member (31) includes an engaged portion (39) of the link mechanism (33) when in the first operating position. A first engaging portion (36a) to be engaged, and a second engaging portion (36b) for engaging the engaged portion (39) of the link mechanism (33) when in the second operating position. The vehicle seat according to claim 5, wherein the vehicle seat is provided.
7. The unlocking holding member (31) has a guide portion (36g) for guiding the engaged portion (39) from one of the first and second engaging portions (36a, 36b) to the other. The vehicle seat according to claim 6, wherein the vehicle seat is provided.
8. The lock release holding member (31) is locked so that the engagement state of the first and second engagement portions (36a, 36b) with the engaged portion (39) can be held respectively. A holding spring (35) for urging the release holding member (31) is connected, and the engaged portion (39) is guided by the guide portion (36g) so that the engaged portion (39) is the first and first. During the movement from one of the two engaging portions (36a, 36b) to the other, the biasing mode of the holding spring (35) is changed to one of the first and second engaging portions (36a, 36b). Switching top portion (36gt) for switching from the mode of engaging and holding the joint portion (39) to the mode of engaging and holding the engaged portion (39) to the other of the first and second engaging portions (36a, 36b) The vehicle seat according to claim 7, comprising:
9. A holding spring (35) is provided on one side of the vertical surface passing through the rotation axis of the unlocking holding member (31) with respect to the movable side portion (Ss), and the first and second engagements are provided on the other side. 9. The vehicle seat according to claim 8, wherein the joint portions (36a, 36b) and the guide portions (36g) are respectively arranged.
10. The locking mechanism (L) includes a latch (7r ′) with a locking groove (14) provided in one of the cushion body (Sm) and the movable side portion (Ss), and is provided in either one of them. And a locking member (13) that can be engaged with and disengaged from the locking groove (14), and when the locking member (13) is locked to the locking groove (14), the lock is activated. When the lock member (13) is released in response to an operation input to the operation input unit (34), the lock is released, and the lock release holding mechanism (LL ′) An unlocking holding member (31 ′) that is activated in response to an operation input to the operation input portion (34) in a state where the movable side portion (Ss) is locked at the standing position (U) by the mechanism (L). ) And its lock The removal holding member (31 ′) engages with the lock member (13) so as to prevent the lock member (13) from entering and engaging with the lock groove (14) in this operating state. The vehicle seat according to claim 3 or 4, characterized by the above.
11. The vehicle seat according to claim 10, wherein the unlocking holding member (31 ') is arranged adjacent to the latch (7r').
12. The unlocking holding member (31 ′) has an operating position capable of engaging with the locking member (13) so as to prevent the locking member (13) from entering and engaging with the locking groove (14). The locking member is movable when the movable side portion (Ss) returns to the standing position (U) after the tilting. The vehicle seat according to claim 10 or 11, wherein the unlocking holding member (31 ') is moved from the operating position to the inoperative position in conjunction with 13).
13. The unlocking holding member (31 ′) is connected to a return spring (96) capable of elastically holding it in the operating position, and the locking 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). When the operation input section (34) is operated and input in the engaged state, the lock member (13) is released from the engagement with the engagement groove (14) and the lock release holding member. (31 ′) is released, and the unlocking holding member (31 ′) is allowed to move from the inoperative position to the activated position by the elastic force of the return spring (96), and the movable side portion (Ss) tilts from the standing position (U) and again In the process of returning to the standing position (U), the unlocking holding member (31 ′) can be forcibly moved from the operating position to the non-operating position against the elastic force of the return spring (96). An interlocking mechanism (R ′) that links the unlocking holding member (31 ′) to the locking 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 12.
14. 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 skeleton of the cushion body (Sm), and the side frame (Fs, Fs ′) is joined. ) The movable side portion (Ss) is pivotally supported (8) so as to be rotatable between the standing position (U) and the tilting position (D), and the side frames (Fs, Fs ′) and the movable side are supported. The vehicle seat according to claim 1, wherein a locking mechanism (L) capable of locking the movable side portion (Ss) in the standing position is provided between the portions (Ss).
15. 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) ( 15. The vehicle seat according to claim 14, wherein the side frames (Fs, Fs') are fastened to 5a, 5b, 5c).
16. A support wall portion (W) for supporting a shaft support portion of the movable side portion (Ss) to the side frame (Fs, Fs ′) is integrally provided on the side frame (Fs), and the cushion frame ( 16. The vehicle according to claim 14, wherein the support wall portion (W) is fastened to a portion (5a, 5b, 5c) of the cushion body (Sm) exposed from the outer surface of the cushion body (Sm). Sheet.
17. The at least one part (6f, 6m, 6r) of the said support wall part (W) functions as a pad position control part contact | abutted to the pad part (1) of the said cushion main body (Sm), It is characterized by the above-mentioned. 16. The vehicle seat according to 16.
18. The position where the cushion frame (Fm) is offset to the vehicle front side or the rear side from the bottom plate frame (B) of the movable side part (Ss) on the mounting wall part (6rw) provided continuously to the support wall part (W). The vehicle seat according to claim 16 or 17, characterized in that the vehicle seat is fastened.
19. The support wall (W) is provided with the movable side portion (Ss) and the escape portion attached to the movable side portion (Ss) to avoid interference with a member that rotates together with the movable side portion (Ss). The vehicle seat according to any one of claims 16 to 18, wherein (6fk, 6rk) is formed.
20. The support wall portion (W) has at least an enclosing wall portion (6f, 6m, 6r) surrounding a shaft support portion of the movable side portion (Ss) to the side frame (Fs). The vehicle seat according to any one of claims 16 to 19.
21. The enclosure wall portion (6f, 6m, 6r) of the support wall portion (W) is accommodated in a recess (1a) formed in an outer portion of the pad portion (1) of the cushion body (Sm). The vehicle seat according to claim 20.
22. 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 skeleton of the cushion body (Sm), and the side frame (Fs, Fs ′) is joined. ) The movable side portion (Ss) is pivotally supported (8) so as to be rotatable between the standing position (U) and the tilting position (D), and the side frames (Fs, Fs ′) and the movable side are supported. A locking mechanism (L) capable of locking the movable side portion (Ss) in the upright position is provided between the portions (Ss), and the return member (50) projects from the side frame (Fs). The vehicle seat according to any one of claims 5 to 9.
23. At least a part of the cushion frame (Fm) is composed of a wire-like frame (5 '), and a plate (5c) of the wire-like frame (5') is exposed from the outer surface of the cushion body (Sm). A frame-shaped side frame mounting member (70) is coupled, and the side frame (Fs ') is mounted to the wire-shaped frame (5') via the side frame mounting member (70). Item 15. The vehicle seat according to Item 14.
24. 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). Vehicle seat described in 1.
25. The vehicle seat according to claim 24, wherein the side frame attaching member (70) is sandwiched between the side frame (Fs') and the side frame supporting member (71).

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