JP2658774B2 - Turning type seat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bench-type directional changeable seat suitable for use as a vehicle seat for a train, for example, and more particularly to a seatback swinging on a seat cushion to change an upright position. The present invention relates to a direction-changing seat capable of freely changing a seating direction of the seat to a desired state.

[0002]

2. Description of the Related Art A bench seat used as a vehicle seat for a train or the like may be capable of arbitrarily selecting a seating direction for a seat according to a traveling direction of a train or according to a seater's preference or request. A turning structure is adopted. Examples of this type of direction-changing sheet include, for example,
Various structures have been proposed in the prior art, such as Japanese Patent Publication No. -24631 and Japanese Utility Model Application Laid-Open No. 2-8635.

Conventionally, as this type of direction-changing seat, generally, a pair of swing arms that support the seat back in an upright state is supported on a supporting pedestal provided on an installation floor below the seat cushion. By swinging the seat back through these swing arms and positioning the seat back on the front and rear ends of the seat on the seat cushion, the seating direction of the seat can be changed arbitrarily. ing.

[0004] For example, the former conventional example discloses a structure in which a pair of swing arms for supporting a seat back is caused to swing using a fluid pressure reciprocating mechanism. still,
In this conventional example, the seat cushion is also swung along with the movement of the swing arm, and consideration is given to obtain an appropriate seating state when the seating direction in the seat is changed.

In the latter conventional example, a seat back is swingably supported by a pair of swing arms on a supporting pedestal provided on an installation floor, and is interlocked with the pair of swing arms. There is disclosed a seat structure in which a link arm swinging is provided and a seat cushion is configured to be swingable on a support base.

By the way, in the direction-changing type seat as described above, the entire seat is stably supported at the lower center portion of the seat cushion at the lower portion of the seat, and the seat back is supported so as to be swingable in the front-rear direction of the seat. A supporting pedestal for providing a moving arm was provided. In such a conventional direction-changing type seat, the seat back is swung through a swing arm to change the standing position on the seat cushion, and to change the seating direction in the front-back direction of the seat. The above-described swinging operation can be stably obtained.

[0007]

However, in the above-described conventional turning type seat, the length of the pair of swing arms for swingably supporting the seat back, the support pedestal at the lower end and the upper end of the seat, and the seat. The pivotal support position on the back side is fixedly determined, so that the inclination angle of the seat back cannot be adjusted.

In particular, in a vehicle seat or the like, a reclining device capable of changing a swing angle of a seat back erected on a seat cushion is provided, and an inclination angle of the seat back is adjusted with respect to a seat cushion by a seated person. 2. Description of the Related Art Conventionally, a configuration that can be freely adjusted according to a physique or a preference is generally performed. Even in the above-mentioned direction-changing type seat, it is desired that the inclination angle and the like of the seat back can be adjusted. It is necessary to take.

Further, in the above-mentioned direction-changing type seat, it is necessary to provide a large supporting pedestal between the lower portion of the seat cushion as a seating portion and the vehicle floor as the seat installation floor. there were. Therefore, in such a seat, it is difficult to secure a luggage storage space below the seat cushion.

That is, in the above-mentioned conventional seat structure, it is difficult to obtain a luggage storage space for the occupant to place luggage, legs, etc. under the seat cushion due to the presence of the support pedestal. there were.

Further, in such a seat, there is a problem that the presence of the above-mentioned supporting pedestal becomes a hindrance when cleaning the inside of a vehicle such as a train. It is also desirable to take measures to enable effective utilization.

In this type of direction-changing seat, it is desired that the direction-changing structure by swinging the seat back and its operation be made as simple as possible. The structure is complicated and the operability is also a problem, and it cannot be said that anyone can change direction very easily with a light force, and it is necessary to consider such points.

Further, what is required in configuring this kind of direction-changing type seat is that the seating direction can be freely and reliably controlled by a simple operation by the swinging operation of the seat back as described above. In conjunction with this, the seat cushion may also be swung to make it easy to sit at an inclined angle, and a configuration that can achieve such a direction-changing type seat with a structure as simple as possible is adopted. Is also needed.

The present invention has been made in view of such circumstances, and a very simple structure allows a seat back or a seat cushion to be turned in a desired state and by a simple operation. Adjustment of tilt angle etc. can be freely performed by simple operation,
It is still another object of the present invention to provide a direction-changing sheet capable of securing a necessary and sufficient space between an installation surface and a lower portion of the sheet.

[0015]

In order to meet such a demand, a directional turning seat according to the present invention comprises a pair of left and right sides which are provided on both sides of a seat cushion and support the seat back in a swingable state. A seat support member to be formed, and a pair of swing arms each having a lower end pivotally supported by each of the seat support members and an upper end pivotally supported by a pivot provided at the lower end of the seat back. A pivot support interval adjusting mechanism for adjusting the interval between the pivot supports at one of the upper and lower ends of each of the swing arms is provided.

The direction-changing sheet according to the present invention includes a cantilever support rod extending in the sheet width direction while being supported in a cantilever manner by a leg standing on an installation surface. A pair of left and right seat support members provided along the front and rear direction of the seat at both ends of the support rod to support a seat cushion and a seat back; A pair of swing arms, each of which has an upper end pivotally supported by a pivot provided at a lower end of the back and swings the seat back in the front-rear direction of the seat, and a seat cushion which is arranged to be stretched between the seat support members and A swing link that supports the frame body to be able to swing on a seat support member, and a link that operates in conjunction with the swing link and a swing arm on the seatback side, On the swing arm, it is provided with a shaft support interval adjusting mechanism for adjusting the distance between the shaft support in either one of the lower end.

Further, the turning type sheet according to the present invention is
The pivot support interval adjusting mechanism is arranged such that one end of each of the pair of pivot arms is pivotally supported and the pivot arm ends are connected to and separated from the pivot support of the mating member to which the pivot arm ends are connected. A pair of pivot pin members provided, and a manual adjustment knob at an outer end rotatably supported by a pivot hole formed in the pivot portion between the pivot pin members; A screw shaft, a nut member screwed into a part of the screw shaft in the axial direction thereof, and a pair of joint links bridged between the nut member and each of the shaft support pin members. It is composed.

[0018]

According to the present invention, in a pair of swing arms having upper and lower ends pivotally supported by a seat back and a seat support member, the distance between any one of the pivotal supports can be adjusted. The tilt angle of the seat back can be adjusted arbitrarily by the provided shaft support interval adjustment mechanism, and by swinging the seat back by the swing arm in the front-back direction of the seat, the seating direction to the seat can be changed. It can be turned in a desired direction.

Further, according to the present invention, a predetermined inclination angle is provided via a swing arm on a seat support member provided at both ends of a support rod which is cantilevered via a leg on an installation surface. The seat back, which is set and adjusted, is supported by each of the seat cushions via a swing link that is linked to the swing arm via a link so that the seat back can be swung in the front-rear direction of the seat. The direction can be changed so as to obtain the required seating direction and seating posture, including the seat cushion.

Furthermore, according to the present invention, the nut member is moved on the screw shaft by rotating the screw knob for manual adjustment by rotating the screw shaft, and accordingly, the nut member is connected via the joint link. The pivot pin members at the ends of each swing arm are moved so as to approach or separate from each other on the pivot portion of the mating member, and thereby the interval between the pivot portions at the end of the swing arm is required. It is possible to adjust the seat back to an arbitrary inclination angle as a result.

[0021]

1 to 13 show one embodiment of a turning type seat according to the present invention. In these figures, first, a vehicle such as a train generally indicated by reference numeral 1 using FIGS. 6 and 7 will be described. The basic configuration of a bench seat type reversing type seat used as a seat for a passenger will be briefly described. That is, as is apparent from FIG. 7, the direction-changing type seat 1 includes a seat cushion 2 and a seat back 3 erected on the front or rear end side thereof, and is placed on a seat installation floor 4 of a train or the like. It is mounted and provided. In FIG. 7, reference numeral 5 denotes a cabin wall of a train or the like, reference numerals 6 and 6 denote headrest portions at the upper end of the seat back 3, and reference numerals 7 and 7 denote armrests on both sides of the seat cushion 2.
The direction-changing type seat 1 has a well-known structure as a bench seat, but a detailed description thereof will be omitted.

The direction-changing sheet 1 as described above is provided upright on the installation floor 4 at a portion near one side in the width direction of the sheet 1, as is apparent from FIGS. A cantilever support rod 12 extending in the width direction of the seat 1 in a state of being cantilevered by the legs 11, and provided at both ends of the support rod 12 along the front-back direction of the seat 1. A pair of seat support members 13 for supporting the seat cushion 2 and the seat back 3, and a lower end portion for each of the seat support members 13, 13 and a shaft support portion 40 provided at the lower end of the seat back 3. (See FIGS. 2 and 6 and the like.) A pair of swing arms 14 and 15 that are pivotally supported at the upper ends thereof to swing the seat back 3 in the front-rear direction of the seat 1, and the two seat support members 13 and It is placed between 13 Frame 16, which constitutes the seat cushion 2, swing links 17, 17 for supporting the frame 16 so as to swing on the seat support members 13, 13, and the swing links 17, 17, and the seat It is configured to include connecting links 18, 18 that operate in conjunction with the swing arms 14, 15 on the back 3 side.

According to such a configuration, the swing arm is provided on the seat support members 13 provided at both ends of the support rod 12 which is cantilevered via the legs 11 on the installation floor 4. 1
The seat back 3 (the seat back frame 19 constituting the seat back) is connected to the swing arms 14 and 15 via the swing links 17 and 17 via the swing links 17 and 17 via the swing links 17 and 17, respectively. Each of the seat cushions 2 (the frame 16 constituting the seat cushions) is supported, and the seat back 3 is simply swung in the front-rear direction of the seat 1. As is apparent, the direction is changed so as to obtain the required seating direction and seating posture, and the seating direction with respect to the seat 1 can be changed to an arbitrary direction.

Further, according to the above-described direction-turning type seat 1, the seat 1 is supported by the cantilever support rod 12 which is cantilevered with respect to the legs 11 standing on the installation floor surface 4.
The structure which supports the whole is adopted. Therefore, in such a direction-changing type seat 1, despite the extremely simple structure, a sufficient space can be secured between the lower part of the seat cushion 2 and the installation floor 4, and the occupant can place the luggage. It is possible to obtain a luggage storage space where the user can put his / her feet, etc., and to effectively utilize the space under the seat. In particular, by locating the leg 11 that cantileverly supports the support rod 12 that supports the entire seat 1 on the side of the cabin wall 5 of a train or the like, it is possible to eliminate the presence of an obstructive member on the passage side. Thus, the workability at the time of cleaning can be greatly improved.

Here, as is apparent from FIGS. 13 (a), 13 (b) and 13 (c), the leg portion 11 is formed of an aluminum alloy or a steel material having a substantially U-shaped cross section. It is bolted to the floor 4 at a plurality of locations, and also bolted to the support rod 12 at a plurality of locations. Further, in this leg portion 11, a locking portion 11a provided on a lower end portion opposite to the extending direction of the support rod 12 is connected to the installation floor surface 4 side as shown in FIGS. The support rod 1 is locked by a locking member 20 integrally or integrally provided on the support rod 1.
The entire sheet 1 including the sheet 2 is cantilevered with sufficient strength.

The support rod 12 is also shown in FIGS.
As is clear from the above description, similarly to the above-mentioned leg portion 11, it is formed of an aluminum alloy frame or a steel material frame having a predetermined strength and a substantially rectangular cross section, and has seat support members 13 on both left and right ends thereof. , 13 are provided.

Here, the seat support member 13 is shown in FIGS.
As shown in FIG. 12 to FIG. 12, the sheet has a shape extended in the front-rear direction of the seat by an aluminum alloy frame or a steel frame or the like, and the front end portion and the rear end portion have inclined portions inclined upward. Is formed. In FIGS. 11A, 11B, and 11C, reference numeral 21 denotes the support rod 12.
Is a clamp member that cooperates with a seat support member 13 provided to be fitted into the end portion thereof to fix and hold the bolt.
Has been fixed by. Thereby, the seat support member 1
The support members 13 and 13 are detachably fixed to both ends of the support rod 12 to simplify the support structure including the leg 11 and the support rod 12 and to improve workability and assemblability. It is.

As is apparent from FIGS. 6 and 8 to 10, the front and rear inclined portions of the front and rear inclined portions of the seat support member 13 are provided on both sides of the frame 16 constituting the seat cushion 2. The arc-shaped receiving portions 26, 26 which support the substantially triangular support pieces 25, 25 provided at the rear portion in a slidable state when the frame body frame 16 swings.
Are formed.

Here, of the above-mentioned support pieces 25, 25, the front one has an inclined surface inclined obliquely rearward, and the rear one has an inclined surface inclined obliquely forward. It is formed in a shape having a surface. Each of these inclined surfaces slides on the arc-shaped receiving portions 26, 26, so that the seat cushion 2 by the frame body frame 16 is moved.
However, as is clear from FIG. 8 to FIG. 10, it is formed as an arcuate surface shape that swings in the seat front-back direction. The shape of the inclined arc surface between the support piece 25 and the arc-shaped receiving portion 26 may be arbitrarily selected depending on the swing motion of the seat cushion 2 and the sitting posture at the time of sitting.

According to such a configuration, the seat back 3
However, the swinging arms 14 and 15 allow the seat support members 13 and
13, and the movement is performed via connecting links 18, 18 interlocking with the swing arms 14, 15.
The support pieces 25, 25 of the frame 16 constituting the seat cushion 2 are transmitted to the swinging links 17, 17 on the side of the seat cushion 2, and thereby the seat support members 13, 1
When the seat cushion 2 slides along the sliding surfaces on the arc-shaped receiving portions 26, 26 formed at the upper end edge of the seat cushion 3, the front end or the rear end of the seat cushion 2 jumps upward. Thus, the seat 1 is swung in the front-back direction.

Accordingly, the seat cushion 2 swings in accordance with the swinging operation of the seat back 3 so as to obtain a predetermined sitting posture, and the support pieces 25, 25 of the frame 16 are seat support members. Since it is always slidably supported on the arc-shaped receiving portions 26 on the 13th and 13th sides, the occupant can be seated in a required posture and with required strength. In addition, there is no fear that a rattling problem occurs during the operation of the seat cushion 2, and this is effective in obtaining stability during operation.

In the present embodiment, the support pieces 2 on the frame body 16 side at the upper end edges of the seat support members 13, 13 described above.
The swing arms 14, 15 for swingably supporting the seat back 3 on the seat support members 13, 13 are engaged at the swing end positions at side positions close to the arc-shaped receiving portions 26, 26 supporting the seats 5, 25. Stoppers 27, 27 for stopping are formed.

In this manner, the seat back 3 is provided with the swinging arms 14, 15 for swinging the seat back 3, the stoppers 27, 2 provided on the upper edge of the seat support members 13, 13.
By being locked at 7, the rocking end position is locked and held at a required inclination angle, so that the load caused by the leaning of the occupant can be supported. Further, in this embodiment,
The stopper 27 is provided adjacent to the outer side of the arc-shaped receiving portion 26, and has a function of preventing the support piece 25 of the frame body frame 16 from being displaced by a step due to the stopper 27. This can be effective in obtaining a stable support state.

Further, according to the above-described direction-changing type seat 1, the connecting links 18, 18, which are linked to the swing arms 14, 15, which swingably support the seat back 3 on the seat support members 13, 13, are provided. Before and after supporting the support rod 12 between the seat support members 13 and 13 and avoiding the support rod 12, it is connected to the ends of the rear interlocking shafts 30 and 31, and these interlocking shafts 3
The swing links 17, 17 for swinging the frame body 16 on the seat cushion 2 side on the seat support members 13, 13 are connected to a part of 0, 31.

That is, both ends of the interlocking shafts 30, 31 are pivotally supported by the left and right seat support members 13, 13, and the first arm portions 32, 32 fixed to the ends thereof, are connected to the coupling arms 30, 32. Linked with the links 18, 18 and the interlocking shafts 30, 3
Second arm portions 33, 33 provided at the center in the axial direction of the first arm.
Are connected to the swing links 17. The other ends of the oscillating links 17 and 17 are connected to the frame body 16.
In consideration of the positional relationship between the frame body 16 and the interlocking shafts 30, 31 which are connected to the connecting arm portions 34, 34 provided on the side and are arranged so as to avoid the support rod 12 as described above, a substantially crescent moon is provided. It is formed so as to exhibit a shape.

According to such a configuration, the seat back 3
Is swingably supported on the seat support members 13, 13, so that the connecting link 1 interlocked with the swing arms 14, 15.
The interlocking shaft 3 is supported by supporting the movement of the support members 8 and 18 between the seat support members 13 and 13 at a position avoiding the cantilever support rod 12.
The frame frame 16 on the side of the seat cushion 2 is transmitted to the swinging links 17, 17 for swinging on the seat support members 13, 13 via the 0, 31 to bring the seat back 3 and the seat cushion 2 into a required state. It can be operated in conjunction with.

Here, the above-mentioned interlocking shafts 30, 31 and swing links 17, 17, interlocking links 18, 18, frame body frame 16 of swing arms 14, 15 and seat support members 13, 1
For example, the swinging arms 14 and 15 are
The supporting shafts 13, 31 having the second arm portions 33, 33 are pivotally supported by the seat support members 13, 13, and the first arm portions 32, 32 are pivotally supported by the seat supporting members 13, 13.
By attaching the connecting links 18 and 18 and connecting the swinging links 17 and 17 to the connecting arms 34 on the frame body 16 side, this can be easily performed.

As shown in FIGS. 1, 6, 8 to 10, etc., the swing arms 14 and 15 have support rods 12 at the center of the seat support members 13 and 13, respectively.
The other end is supported at the front and rear ends of the support arms 37, 37 of the support 40 provided at the lower end of the seat back 3. . Here, the length of the pair of swing arms 14 and 15 is set to a predetermined length such that the standing posture of the seat back 3 with respect to the seat cushion 2 is set to an angle at which a seated person can easily sit. Set to the ratio.

Further, the turning type sheet 1 as described above
8 to 10, the seat back 3 can be moved forward or backward of the seat 1 so that the seat cushion 2 can swing in conjunction with the movement. . In particular, in the above-described configuration, since the entire seat 1 is supported in a well-balanced manner with respect to the seat support members 13 provided at both ends of the support rod 12, the above-described direction change can be performed by holding the seat back 3 with one hand. By simply moving, it can be performed in a well-balanced, easy and appropriate manner, and is excellent in operability.

According to the present invention, in the direction-changing seat having the above-described structure, as is apparent from FIGS. 1 to 5, the seat back 3 provided on both sides of the seat cushion 2 swings. Lower ends of the pair of left and right seat support members 13 and 13 supported in a possible state are pivotally supported, and upper ends of pivots 40 (piston arms 37, 37) provided at the lower end of the seat back 3. And a pair of swing arms 14 and 15 each of which is pivotally supported, and one of the upper and lower ends of each of the swing arms 13 (in this embodiment, the shaft at the lower end of the seat back 3). It is characterized in that a shaft support interval adjusting mechanism 50 for adjusting the space between the shaft supports in the support 40) is provided.

According to such a configuration, in the pair of swing arms 14, 15, the upper and lower ends of which are pivotally supported by the seat back 3 and the seat support member 13, respectively.
The tilt angle of the seat back 3 is arbitrarily adjusted as shown by 3, 3A, and 3B in FIG. 1 by a shaft support space adjusting mechanism 50 provided so that the space at any one of the support portions 40 can be adjusted. Further, the seat back 3 can be swung in the front-rear direction of the seat 1 by the swing arms 14 and 15 to change the seating direction of the seat 1 to a desired direction.

In FIG. 1, the shaft support interval adjusting mechanism 5 is used.
0, the pivotal support positions P,
The case where the seat back 3 is displaced to both sides by changing the inclination angle from the center position S by the angle α by changing the interval distance 1 between P ′. For example, when the distance 1 is increased, the seat back 3 is displaced to the position 3B, and conversely, when the distance l is decreased, the seat back 3 is displaced to the position 3A.

Here, the above-described shaft support interval adjusting mechanism 50 is used.
This adjustment mechanism 50 will be briefly described with reference to FIGS. 2 to 5. The adjusting mechanism 50 is a swing arm which is pivotally supported by the pivoting arms 37 of the pivoting portion 40 provided at the lower end side of the seat back 3. 14, 15 are provided, and these support pins 51, 52 are provided in the elongated holes 41, 4 provided in the support portion 40.
2 makes it possible to approach and separate.

In the figure, reference numeral 43 denotes a shaft hole formed in the center of the shaft support portion 40. A screw shaft 53 is rotatably supported in the shaft hole 43, and a manual adjustment screw is provided at the outer end thereof. A knob 60 is provided. The screw shaft 53 is configured to connect the screw shafts 53 on both the left and right sides of the seat to each other by a connecting tube 54 connected by a locking pin 54a, and these are operated in conjunction with each other.

The joint links 56 and 57 are bridged between the support pins 51 and 52 and the nut member 55 which is screwed to a part of the screw shaft 53 in the axial direction. Each is rotatably supported by the support pins 51a, 52a; 55a.

In such a configuration, when the screw shaft 53 is rotated by the knob 60, the screwing position of the nut member 55 is changed in the axial direction by the rotation of the screw shaft 53, and accordingly, the links 56, 57 are connected. It can be easily understood that the pivot pins 51 and 52 connected by the above are approached and separated from each other by the elongated holes 41 and 42, thereby adjusting the interval.

In such a configuration, the seat back 3 supported on the seat support members 13, 13 via the swing arms 14, 15 is connected to the screw shaft 53 and the nut member 5.
It can be adjusted steplessly by the screwing adjustment position with 5,
By adjusting the interval, the inclination angle of the seat back 3 can be adjusted to an arbitrary state.

It should be noted that the present invention is not limited to the structure of the embodiment described above, and the shape, structure, etc. of each part of the direction-changing sheet 1 can be freely modified and changed as necessary, and Various modifications may be considered depending on the situation. For example, in the above-described embodiment, the case has been described in which the pivot support interval adjusting mechanism 50 is applied to the pivot support portions of the swing arms 14 and 15 at the lower end of the seat back 3.
It goes without saying that the seat support member 13 of FIG.

Further, the present invention provides a screw shaft 5 as described above.
The adjusting mechanism 50 is not limited to the combination of the nut 3, the nut member 55, and the joint links 56, 57, and any appropriate adjusting mechanism can be used as long as the distance between the shaft supports can be adjusted.

[0050]

As described above, according to the turning type seat according to the present invention, a pair of left and right seat support members disposed on both sides of the seat cushion to support the seat back in a swingable state. And a pair of swing arms each having a lower end pivotally supported by each of the seat support members and an upper end pivotally supported by a pivot provided at the lower end of the seat back. A pair of swing arms is provided despite the simple structure because a shaft support interval adjusting mechanism for adjusting the interval between the shaft supports at one of the upper and lower ends of the swing arm is provided. The tilting angle of the seat back can be arbitrarily adjusted by a very simple operation by the shaft supporting interval adjusting mechanism capable of adjusting the spacing of one of the supporting portions. By by swinging operation in the sheet longitudinal direction, it exhibits various excellent effect that the seating direction of the seat capable of turning in the desired direction.

Further, according to the direction-changing sheet according to the present invention, the cantilever support rod extending in the sheet width direction while being cantilevered by the legs erected on the installation surface. When,
A pair of left and right seat support members are provided along the front and rear direction of the seat at both ends of the support rod to support the seat cushion and the seat back, and the lower ends of the pair of seat support members are pivotally supported, respectively. A pair of swing arms, each of which has an upper end pivotally supported by a pivot portion provided at the lower end of the seat back and swings the seat back in the front-rear direction of the seat; A swing link that supports the frame frame to be swingable on the seat support member, and a connecting link that operates in conjunction with the swing link and the swing arm on the seatback side. Since the shaft support interval adjusting mechanism for adjusting the space between the shaft supports of one of the upper and lower ends is provided, in addition to the above-described effects, the structure is simple. Since the entire seat is cantilevered, the space between the seat and the installation surface at the bottom of the seat is necessary and sufficient, and the direction of the seat back and the seat cushion can be changed in the required state. It has advantages such as easy operation.

In particular, according to the above-described configuration, the seat back is provided via the swing arm on the seat support members provided at both ends of the support rod which is cantilevered on the installation surface via the legs. Since the seat cushion is supported via the swing link that is linked to the swing arm via a link, the seat back can be swung in the front-back direction of the seat, and the seat cushion can be In addition, it is possible to change the direction to obtain the required seating direction and seating posture.

Further, according to the direction-changing type seat according to the present invention, the pivot support interval adjusting mechanism is constructed such that one end of each of the pair of pivot arms is pivotally supported and the pivot arm ends are connected. A pair of pivot pin members provided so as to be able to approach and separate from each other with respect to the pivot portion of the mating member,
A screw shaft rotatably supported by a shaft hole formed in the shaft support portion between these shaft support pin members and having a manual adjustment knob at an outer end; Since it is configured by a nut member screwed to the part and a pair of joint links bridged between the nut member and each of the pivot pin members, despite the simple structure, By a very simple operation of rotating the knob for manual adjustment, the pivot pin members at the ends of each swing arm connected by a joint link are moved closer or farther apart with the nut member moving by the rotation of the screw shaft. In addition, the distance between the pivotal arm ends can be adjusted to a required state, and as a result, the seat back can be continuously changed to an arbitrary inclination angle.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of a direction-changing type sheet according to the present invention, which is a main part of a pivot support interval adjusting mechanism.

FIG. 2 is a schematic perspective view showing one embodiment of a shaft support interval adjusting mechanism in the direction-changing type seat according to the present invention.

FIG. 3 is a schematic cross-sectional view for explaining the operation of the shaft support interval adjusting mechanism shown in FIG. 2;

FIG. 4 is a schematic longitudinal sectional view for explaining the operation of the shaft support interval adjusting mechanism shown in FIG. 2;

FIG. 5 shows components (a), (b),
The schematic diagram shown individually in (c), (d), and (e).

FIG. 6 is a schematic perspective view for explaining a main part structure showing one embodiment of a suitable turning type sheet to which the present invention is applied.

FIG. 7 is a schematic front view showing an embodiment of a direction-changing sheet suitable for applying the present invention.

FIG. 8 is a schematic explanatory view for explaining a main structure of the direction-changing sheet of FIG. 6;

FIG. 9 is a schematic diagram illustrating a seat back operation from FIG. 8;

FIG. 10 is a schematic diagram illustrating a seat back state operated through FIGS. 8 and 9;

11 (a), (b), and (c) are main part plan views showing the relationship between a seat support member and a cantilever support rod which characterize the present invention, and are sectional views taken along lines BB and CC. FIG.

12 (a), (b), and (b) show the relationship between the cantilever support rod and the seat support member in the direction-changing seat according to the present invention.
The schematic explanatory drawing shown by (c).

FIG. 13 shows the legs supporting the cantilever support rod,
The schematic diagram shown by (b) and (c).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Direction change type seat 2 Seat cushion 3 Seat back 4 Installation floor surface 11 Leg part 12 Cantilever support rod 13 Seat support member 14 Swing arm 15 Swing arm 16 Frame body 17 Swing link 18 Connection link 19 Seat back frame Reference Signs List 20 Leg locking member 25 Support piece 26 Arc-shaped receiving part 27 Stopper 30 Front interlocking shaft 31 Rear interlocking shaft 40 Shaft support 50 Shaft support interval adjustment mechanism 51 Shaft pin 52 Shaft pin 60 Manual adjustment knob

Claims (3)

(57) [Claims] 1. A pair of left and right seat support members arranged on both sides of a seat cushion to support a seat back in a swingable manner, and a lower end portion of each of the seat support members is pivotally supported. A pair of swinging arms each having an upper end pivotally supported by a pivoting portion provided at the lower end of the seat back; and a pivoting support at one of the upper and lower ends of each of the pivoting arms. A direction changing type seat provided with a shaft support interval adjusting mechanism for adjusting an interval between the seats. 2. A cantilever support rod extending in the sheet width direction while being cantilevered by a leg erected on an installation surface, and both ends of the support rod extend in the seat front-rear direction. A pair of left and right seat support members provided along the seat cushion and the seat back, the lower ends of the respective seat support members being pivotally supported, and an upper end being defined by a pivot portion provided at the lower end of the seat back. A pair of swing arms, each of which is pivotally supported to swing the seat back in the front-rear direction of the seat, and a frame frame which is arranged and bridged between the two seat support members and serves as a seat cushion. A swing link that supports a swing operation on a member; and a link that operates in conjunction with the swing link and the swing arm on the seatback side. Diverting type sheet, characterized in that a shaft support interval adjusting mechanism for adjusting the spacing between the shaft supporting at either of the parts. 3. The direction changing type seat according to claim 1, wherein the shaft support interval adjusting mechanism is configured such that one end of each of a pair of swing arms is respectively supported and the end of the swing arm. And a pair of pivot pin members provided so as to be able to approach and separate from each other with respect to the pivot portion of the mating member to be connected, and a shaft drilled in the pivot portion between these pivot pin members. A screw shaft rotatably supported by the hole and having a manual adjustment knob at an outer end; a nut member provided by being partially screwed in the axial direction of the screw shaft; A direction changing type seat comprising a pair of joint links bridged between each of the pivot pin members.