Patent Description:
Conventionally, a conveyance seat device including a saddle-type seat used for motorcycles, snow bikes, personal watercraft, or the like and a seat height adjustment unit capable of adjusting a height position of the seat is known and various techniques for compactly disposing the seat height adjustment unit and for efficiently operating the seat height adjustment unit have been proposed (for example, see Patent Citation <NUM>).

For example, in the conveyance seat device described in Patent Citation <NUM>, the seat height adjustment unit includes a seat support plate which supports the seat from below, rotation links which rotate together with the support plate when adjusting the position of the seat and in which one of the rotation links serves as a drive link, and a motor device which operates the drive link and the rotation links include a front link and a rear link which are provided at different positions in a front to back direction of the seat. Then, the front link and the rear link are attached to a portion located directly below buttocks of an occupant when the occupant sits on the seat in the seat support plate.

With the above-described configuration, a seat portion on which the buttocks of the occupant rest can be efficiently moved by the rotation operation of each rotation link when adjusting the height position of the seat. Further relevant prior art is described in <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT> and <CIT>. Document <CIT> discloses the preamble of claim <NUM>.

Incidentally, in the conveyance seat device of Patent Literature <NUM>, the seat height adjustment unit includes the motor device or the rotation link (drive link) for adjusting the height position of the seat. Therefore, in order to appropriately operate the rotation link or the motor device, it has been required to devise so that foreign matter such as dust and dirt does not enter from the outside as much as possible in the moving portion.

Particularly, in a saddle-type seat for motorcycles or the like which is a seat capable of adjusting a height position of the seat, since the seat is directly exposed to wind and rain, it has been required to further protect the seat from foreign matter.

The present invention has been made in view of the above-described problems and an object of the present invention is to provide a conveyance seat device capable of appropriately protecting components of a seat height adjustment unit capable of adjusting a height position of the seat from the outside.

According to a conveyance seat device of the present invention, the above-described problems are solved by a conveyance seat device including: a seat on which an occupant of a conveyance sits; and a seat height adjustment unit which is attached below the seat and is able to adjust a height position of the seat, wherein the seat height adjustment unit includes a rotation link which rotates together with the seat with respect to a main body of the conveyance to adjust the height position of the seat and a flexible cover member that covers the rotation link from the outside in a front to back direction of the seat and a width direction of the seat.

With the above-described configuration, it is possible to realize the conveyance seat device capable of appropriately protecting the component (rotation link) operated to adjust the height position of the seat from the outside.

Specifically, since the rotation link is covered by the flexible cover member, it is possible to change the shape of the cover member in accordance with the vertical movement of the seat even when the seat moves vertically in the height direction and hence to protect the rotation link from foreign matter such as dust and dirt at all times.

According to the invention, the seat is a saddle-type seat on which the occupant sits to straddle, the seat height adjustment unit includes a plate-shaped upper link support member that is provided between the seat and the rotation link and is used so that an upper end portion of the rotation link is attached thereto and a lower link support member that is provided between the rotation link and the main body of the conveyance and is used so that a lower end portion of the rotation link is attached thereto, and the rotation link is covered by the cover member, the upper link support member, and the lower link support member.

With the above-described configuration, it is possible to appropriately protect the rotation link from the outside in the saddle-type seat for motorcycles or the like directly exposed to wind and rain.

Further, since the rotation link is covered by the cover member, the upper link support member, and the lower link support member, it is possible to protect the rotation link not only from the outside in the front to back direction of the seat and the width direction of the seat, but also from the outside in the up to down direction of the seat.

At this time, the cover member may have a bag shape and may be configured to wrap the rotation link, the upper link support member, and the lower link support member.

With the above-described configuration, it is possible to protect the operation portion of the seat height adjustment unit (rotation link) and the peripheral portion from foreign matter such as dust, dirt, and water from entering as much as possible from the outside.

At this time, the cover member may be a polyhedron which is formed by joining terminals of a plurality of seat materials and a portion formed by joining the terminals may be located on a ridge of the cover member.

With the above-described configuration, it is possible to easily manufacture the cover member formed as a polyhedron.

According to the invention, the seat height adjustment unit is able to move the seat between a normal position and an upper position in which the seat is moved above the normal position, the cover member may change its shape in accordance with a movement operation of the seat and may be configured to be folded when the seat moves from the upper position to the normal position, and the cover member includes a cover overhanging portion which is provided so that a lateral portion corresponding to the rotation link in the cover member projects outward when the cover member is folded.

With the above-described configuration, it is possible to ensure a clearance between the rotation link and the lateral portion of the cover member when the rotation link moving together with the seat moves from the upper position to the normal position so that the cover member is folded. Therefore, it is possible to suppress the lateral portion of the cover member from being sandwiched between the rotation link and the link support member.

At this time, the cover overhanging portion may be formed by bending a part of the lateral portion of the cover member outward and may be disposed at a peripheral position of a corner portion located at a position closest to the rotation link among a plurality of corner portions in the lateral portion of the cover member.

Further, the cover overhanging portion may be formed by joining the bent portion and may be disposed between two ridges defining the corner portion in the lateral portion of the cover member.

With the above-described configuration, it is possible to further suppress the lateral portion of the cover member from being sandwiched between the rotation link and the link support member when the cover member is folded. As a result, it is possible to more smoothly operate the seat height adjustment unit.

At this time, the rotation link may include a front link and a rear link which are disposed at different positions in the front to back direction of the seat and the cover overhanging portion may be disposed at a lateral portion corresponding to a link serving as a drive link in the front link and the rear link and extend along a center line between two ridges defining the corner portion while starting from the corner portion located at a position closest to the drive link in the lateral portion of the cover member.

With the above-described configuration, since it is possible to appropriately protect the link which is particularly the drive link in the front and rear rotation links from the outside, it is possible to more smoothly operate the seat height adjustment unit.

At this time, each of an upper surface and a bottom surface of the cover member may be provided with an opening hole taking in or taking out components of the seat height adjustment unit, the upper opening hole formed in the upper surface of the cover member may be disposed at a position corresponding to an upper surface of the upper link support member, and the lower opening hole formed in the bottom surface of the cover member may be disposed at a position corresponding to a bottom surface of the lower link support member.

With the above-described configuration, the rotation link, the upper link support member, and the lower link support member which are the components of the seat height adjustment unit can be easily taken in the cover member or taken out of the cover member.

Further, since the cover member covers these components from the outside substantially as a whole, the protection function by the cover member is improved.

At this time, a center hole portion provided at a center portion of each of the upper surface and the bottom surface of the cover member and a plurality of slit hole portions radially extending from the center hole portion and having a slit shape may be formed as the opening hole formed in each of the upper surface and the bottom surface of the cover member, the upper surface and the bottom surface of the cover member may be respectively provided with an upper cover attachment portion and a lower cover attachment portion used to be attached to the upper link support member and the lower link support member, and each of the upper cover attachment portion and the lower cover attachment portion may be disposed between the slit hole portions formed to be adjacent to each other in the surface of the cover member.

With the above-described configuration, the opening hole and the cover attachment portion can be arranged in each of the upper surface and the bottom surface of the cover member without interference. Therefore, the components of the seat height adjustment unit can be easily taken in and out of the cover member. Further, it is also possible to increase the attachment rigidity between the cover member and the upper and lower link support members.

At this time, the conveyance seat device may further include vibration suppressing members that are attached between the seat height adjustment unit and the main body of the conveyance in an up to down direction and suppresses vibration transmitted from the main body of the conveyance to the seat height adjustment unit and the vibration suppressing members may be arranged at predetermined intervals in the front to back direction of the seat and the width direction of the seat.

With the above-described configuration, it is possible to efficiently suppress the vibration transmitted from the main body of the conveyance to the seat height adjustment unit and to protect the components of the seat height adjustment unit.

At this time, the seat height adjustment unit may include a chassis attachment plate which is attached onto the main body of the conveyance, a chassis assembly portion for vertically assembling to an assembled portion provided in the main body of the conveyance may be formed in the chassis attachment plate, and the vibration suppressing member may be attached to the chassis assembly portion or the assembled portion.

With the above-described configuration, it is possible to efficiently attach the seat height adjustment unit and the vibration suppressing member onto the main body of the conveyance.

At this time, the chassis attachment plate may be attached onto the main body of the conveyance by assembling an assembly bolt while a chassis assembly hole serving as the chassis assembly portion and an assembly hole serving as the assembled portion communicate with each other, the vibration suppressing member may be fitted and attached to the chassis assembly hole, and the vibration suppressing member may include a through hole through which the assembly bolt penetrates.

With the above-described configuration, the vibration suppressing member is easily attached and the vibration suppressing member is hard to come off after the vibration suppressing member is attached.

At this time, the seat height adjustment unit may include a lower link support member that is provided between the rotation link and the chassis attachment plate and is used so that a lower end portion of the rotation link is attached thereto, the chassis attachment plate may be provided with an attachment portion for vertically attaching to an attached portion provided in the lower link support member, the vibration suppressing member may include a first vibration suppressing member that is attached to the chassis assembly portion or the assembled portion and a second vibration suppressing member that is attached to the attachment portion or the attached portion, and a plurality of the first vibration suppressing members may be arranged to sandwich the second vibration suppressing member in the front to back direction of the seat and the width direction of the seat.

As described above, since the arrangement pattern of the first vibration suppressing member and the second vibration suppressing member is devised, it is possible to further efficiently suppress the vibration transmitted from the main body of the conveyance to the seat height adjustment unit.

According to the present invention, it is possible to realize the conveyance seat device capable of appropriately protecting the component (rotation link) operated to adjust the height position of the seat from the outside.

Further, according to the present invention, it is possible to appropriately protect the rotation link from the outside in the saddle-type seat of motorcycles or the like directly exposed to wind and rain. Further, it is possible to protect the rotation link not only from the outside in the front to back direction of the seat and the width direction of the seat, but also from the outside in the up to down direction of the seat.

Further, according to the present invention, it is possible to protect the operation portion of the seat height adjustment unit (rotation link) from foreign matter such as dust, dirt, and water from entering as much as possible from the outside.

Further, according to the present invention, it is possible to easily manufacture the cover member formed as a polyhedron.

Further, according to the present invention, it is possible to suppress the lateral portion of the cover member from being sandwiched between the rotation link and the link support member.

Further, according to the present invention, it is possible to more smoothly operate the seat height adjustment unit.

Further, according to the present invention, the rotation link, the upper link support member, and the lower link support member which are the components of the seat height adjustment unit can be taken in the cover member or out of the cover member. Further, the protection function by the cover member is improved.

Further, according to the present invention, the components of the seat height adjustment unit can be easily taken in and out of the cover member. Further, it is also possible to increase the attachment rigidity between the cover member and the upper and lower link support members.

Further, according to the present invention, it is possible to efficiently suppress the vibration transmitted from the main body of the conveyance to the seat height adjustment unit and to protect the components of the seat height adjustment unit.

Further, according to the present invention, it is possible to efficiently attach the seat height adjustment unit and the vibration suppressing member onto the main body of the conveyance.

Further, according to the present invention, the vibration suppressing member can be easily attached and the vibration suppressing member is hard to come off after the vibration suppressing member is attached.

Further, according to the present invention, it is possible to further efficiently suppress the vibration transmitted from the main body of the conveyance to the seat height adjustment unit.

Hereinafter, a conveyance seat device according to an embodiment of the present invention will be described with reference to <FIG>.

This embodiment relates to the present invention of a conveyance seat device including: a saddle-type seat on which an occupant sits to straddle; and a seat height adjustment unit which is attached below the seat and is able to adjust a height position of the seat, wherein the seat height adjustment unit includes a rotation link which rotates together with the seat with respect to a main body of the conveyance to adjust the height position of the seat, an upper link support member that is provided between the seat and the rotation link and is used so that an upper end portion of the rotation link is attached thereto, a lower link support member that is provided between the rotation link and the main body of the conveyance and is used so that a lower end portion of the rotation link is attached thereto, and a flexible cover member that covers the rotation link from the outside in a front to back direction of the seat and a width direction of the seat.

As shown in <FIG> and <FIG>, a seat device S of this embodiment is a conveyance seat device including a seat <NUM> on which an occupant of a motorcycle sits and a seat height adjustment unit <NUM> which is attached below the seat <NUM> and is able to adjust a height position of the seat <NUM> and is set and attached onto a chassis B. At this time, the seat height adjustment unit <NUM> is attached into the chassis B and is disposed between the seat <NUM> and the chassis B in the up to down direction.

As shown in <FIG> and <FIG>, the seat <NUM> is a member that constitutes a seating portion of a motorcycle and mainly includes a bottom plate 1a which is a base board, a cushion material 1b which is placed on the bottom plate 1a, and a skin material 1c which covers the bottom plate 1a and the cushion material 1b.

Additionally, the seat <NUM> is subjected to a skin terminal treatment in which a skin terminal portion serving as a terminal of the skin material 1c is attached to a back surface of the bottom plate 1a by using an attachment member such as a tacker needle.

The bottom plate 1a is made of a plate-shaped synthetic resin molded product made of polypropylene, polyethylene, or the like, and the cushion material 1b is made of an elastic member using urethane foam or the like.

The skin material 1c is made of a covering material using polyvinyl chloride leather or the like, and is suitable as a skin material for motorcycles that are directly exposed to wind and rain.

As shown in <FIG>, the seat <NUM> is supported from below by the chassis B and a seat support plate <NUM> and is detachably attached onto the seat support plate <NUM>.

Further, the seat <NUM> can move in the up to down direction with respect to the chassis B by operating the seat height adjustment unit <NUM> through the operation of the operation button by the occupant.

Therefore, it is possible to adjust the seat height in accordance with the physique of the occupant and the preference of the occupant or to adjust the seat height in accordance with the traveling speed of the motorcycle.

As shown in <FIG>, the seat height adjustment unit <NUM> is a unit capable of moving the seat <NUM> between the normal position and the upper position in which the seat is moved above the normal position and mainly includes the seat support plate <NUM> which supports the seat <NUM> from below, a chassis attachment plate <NUM> which is attached onto the chassis B, an upper link support member <NUM> that is attached to the seat support plate <NUM> between the seat support plate <NUM> and the chassis attachment plate <NUM> in the up to down direction, a lower link support member <NUM> that is attached to the chassis attachment plate <NUM>, a rotation link <NUM> which connects the upper link support member <NUM> and the lower link support member <NUM>, a motor device <NUM> which rotates the rotation link <NUM>, and an ECU <NUM> which controls the motor device <NUM>.

Further, as shown in <FIG>, the seat height adjustment unit <NUM> further includes a flexible cover member <NUM> that covers the upper link support member <NUM>, the lower link support member <NUM>, the rotation link <NUM>, and the motor device <NUM> from the outside.

The seat support plate <NUM> is a metal plate-shaped plate made of a substantially T-shaped body and mainly includes a front plate portion 20a and a rear plate portion 20b which are integrally attached to the bottom surface of the seat <NUM> (the bottom plate 1a) and a center plate portion 20c which is disposed between the front plate portion 20a and the rear plate portion 20b and is integrally attached onto the upper link support member <NUM>.

The center plate portion 20c is a portion located directly below the buttocks of the occupant when the occupant sits on the seat <NUM> and corresponds to a portion that receives a sitting load from the occupant.

The upper surface of the center plate portion 20c is provided with a plurality of attachment holes <NUM> which are used to attach the upper link support member <NUM> and a relief protrusion <NUM> which is provided at a position different from the attachment hole <NUM> to project upward and suppress the interference with a clip member <NUM> to be described later.

The attachment hole <NUM> is a substantially circular through hole and is formed at two positions with a gap therebetween in the width direction of the seat at the front portion and the rear portion of the center plate portion 20c so that the attachment holes are formed at four positions in total.

The relief protrusion <NUM> is a substantially circular projection and is formed at each position adjacent to the attachment hole <NUM> so that the relief protrusions are formed at six positions in total to surround the attachment hole <NUM>.

Additionally, a reinforced bead <NUM> which extends in the front to back direction of the seat is formed at the center portion of the center plate portion 20c in the front to back direction of the seat at two positions with a gap therebetween in the width direction of the seat.

As shown in <FIG> and <FIG>, the chassis attachment plate <NUM> is a member obtained by processing a metal plate-shaped plate into a substantially box shape and has a function for attaching the seat height adjustment unit <NUM> onto the chassis B and a function of holding the component of the seat height adjustment unit <NUM> so as to sandwich the component between the chassis attachment plate and the seat support plate <NUM>.

A plurality of attachment holes <NUM> for attaching the lower link support member <NUM> are formed at a position corresponding to the attachment position of the rotation link <NUM> or the motor device <NUM> at the center portion in the width direction of the seat in the chassis attachment plate <NUM>. Further, a harness passage hole <NUM> through which a harness <NUM> shown in <FIG> is inserted is formed at a position different from the attachment hole <NUM>.

The attachment hole <NUM> is a substantially circular through hole and is formed at four positions in total at intervals in the front to back direction of the seat and the width direction of the seat.

Additionally, a plurality of relief protrusions (not shown) for suppressing the interference with a clip member (not shown) are formed at positions adjacent to the attachment hole <NUM> in the chassis attachment plate <NUM> to project downward.

As shown in <FIG> and <FIG>, the upper link support member <NUM> is a metal plate-shaped member having a substantially inverted U-shape in a vertical cross-section and is disposed to cover the rotation link <NUM> and the motor device <NUM> from above and side.

The upper link support member <NUM> mainly includes an upper wall portion 40a which extends in the front to back direction of the seat, right and left side wall portions 40b which respectively continuously extend from both end portions of the upper wall portion 40a in the width direction of the seat, and a rear wall portion 40c which continuously extends downward from the rear end portion of the upper wall portion 40a and is connected to the right and left side wall portions 40b.

An attachment hole <NUM> is formed at a position corresponding to each attachment hole <NUM> in the upper wall portion 40a to be attached to the seat support plate <NUM>.

Further, as shown in <FIG>, a plurality of cover attachment holes <NUM> for attaching the cover member <NUM> are formed at positions different from the attachment hole <NUM> in the upper wall portion 40a.

The cover attachment hole <NUM> is a substantially circular through hole, is formed at each position adjacent to the attachment hole <NUM>, and is formed at six positions in total to surround each attachment hole <NUM>.

An upper end portion of a front link <NUM> is attached to the front portion of the side wall portion 40b to be rotatable through the upper link rotation shaft <NUM>.

Further, an upper end portion of a rear link <NUM> is attached to the rear portion of the side wall portion 40b to be rotatable through the upper link rotation shaft <NUM>.

In the above-described configuration, as shown in <FIG> and <FIG>, each cover attachment hole <NUM> is disposed at a position facing each relief protrusion <NUM> of the seat support plate <NUM> in the up to down direction.

Therefore, as shown in <FIG>, when the clip member <NUM> is attached to the cover attachment hole <NUM>, the head portion of the clip member <NUM> does not interfere with the seat support plate <NUM> and each component can be compactly disposed.

As shown in <FIG> and <FIG>, the lower link support member <NUM> is a member obtained by processing a metal plate-shaped plate into a substantially box shape and is accommodated and disposed to cover the rotation link <NUM> and the motor device <NUM> from below and side.

The lower link support member <NUM> mainly includes a bottom wall portion 50a which extends in the front to back direction of the seat, right and left side wall portions 50b which continuously extend upward from both end portions of the bottom wall portion 50a in the width direction of the seat, and a front wall portion 50c and a rear wall portion 50d which respectively continuously extend upward from both end portions of the bottom wall portion 50a in the front to back direction of the seat.

A plurality of attachment holes <NUM> for attachment to the chassis attachment plate <NUM> and a plurality of cover attachment holes <NUM> for attaching the cover member <NUM> at a position different from the attachment hole <NUM> are formed in the bottom wall portion 50a.

Further, a motor attachment bracket 70a for attaching the motor device <NUM> is attached to the upper surface of the bottom wall portion 50a and a harness passage hole <NUM> through which the harness <NUM> shown in <FIG> is further formed at a position different from the attachment portion of the motor device <NUM> in the bottom wall portion 50a.

The lower end portion of the front link <NUM> is attached to the front portion of the side wall portion 50b to be rotatable through the lower link rotation shaft <NUM>.

Further, the lower end portion of the rear link <NUM> is attached to the rear portion of the side wall portion 50b to be rotatable through the lower link rotation shaft <NUM>.

A confirmation hole <NUM> for confirming the assembly state of the rotation link <NUM> and the motor device <NUM> is formed at a portion between the lower link rotation shafts <NUM> and <NUM> in the side wall portion 50b.

As shown in <FIG> and <FIG>, the rotation link <NUM> is a member that rotates so that the upper link support member <NUM> located on the side of the seat <NUM> is moved in the up to down direction with respect to the lower link support member <NUM> located on the side of the chassis B in order to adjust the height position of the seat <NUM>.

The rotation link <NUM> includes the front link <NUM> and the rear link <NUM> which are arranged at different positions in the front to back direction of the seat and the rear link <NUM> is used as the drive link and is configured to rotate between the normal position shown in <FIG> and the upper position shown in <FIG>.

Specifically, a sector gear portion <NUM> which is a gear is formed in a part of the outer peripheral portion of the rear link <NUM> and meshes with a pinion gear <NUM> provided to protrude outward from the lateral portion of the motor device <NUM>.

When the motor device <NUM> is operated, the pinion gear <NUM> rotates in accordance with the rotation of the motor body <NUM> and the meshing position between the pinion gear <NUM> and the sector gear portion <NUM> changes. Then, the rear link <NUM> provided with the sector gear portion <NUM> rotates, so that the rear link <NUM> rotates and the front link <NUM> also rotates. As a result, the seat <NUM> moves up and down and the seat height is adjusted.

As shown in <FIG>, the front link <NUM> includes right and left link portions 61a which are arranged with a gap therebetween in the width direction of the seat and a link connection portion 61b which connects the upper end portions of the right and left link portions 61a.

The link portion 61a is made of a substantially elliptical plate member elongated in the front to back direction of the seat, the front end portion is rotatably attached to the upper link support member <NUM>, and the rear portion is attached to the lower link support member <NUM>.

The link connection portion 61b has a shape that is inclined upward from the front end portion to the rear end portion of the link portion 61a in order to avoid the interference with the motor device <NUM>.

The rear link <NUM> has a shape different from the front link <NUM> and includes right and left link portions 62a and a link connection portion 62b which connects the center portions of the right and left link portions 62a.

The link portion 62a is made of a plate member having a substantially V-shape (substantially boomerang shape) that is elongated in the front to back direction of the seat, the front end portion is rotatably attached to the upper link support member <NUM>, and the rear portion is attached to the lower link support member <NUM>.

The outer peripheral portions of the upper ends of the right and left link portions 62a are provided with a link curved portion <NUM> which is curved downward.

Further, the right and left link portions 62a have different shapes from each other and the sector gear portion <NUM> is formed in the outer peripheral portion of the front end of one link portion 62a in the right and left link portions 62a. The sector gear portion <NUM> meshes with the pinion gear <NUM>.

In the above-described configuration, the rotation link <NUM> rotates between the normal position shown in <FIG> and the upper position shown in <FIG>.

When the rotation link <NUM> is located at the normal position shown in <FIG>, a gap G is formed between the upper link support member and the lower link support member in the up to down direction when viewed from the seat side.

Therefore, foreign matter will not be pinched by the upper link support member <NUM> and the lower link support member <NUM> or the hands of the assembling worker will not be pinched by mistake.

Further, when the rotation link <NUM> is located at the normal position shown in <FIG>, the outer peripheral portion (the upper end portion) of the link curved portion <NUM> of the rear link <NUM> and the outer peripheral portion (the upper end portion) of the lower link support member <NUM> are arranged at the overlapping position when viewed from the seat side.

Therefore, foreign matter or the like is not pinched by the upper link support member <NUM> and the rotation link <NUM> (the rear link <NUM>).

Further, in the above-described configuration, as shown in <FIG>, a distance (linear distance) D1 between the upper link rotation shaft <NUM> and the lower link rotation shaft <NUM> in the front to back direction of the seat in the link portion 61a of the front link <NUM> is equal to a distance D3 between the upper link rotation shaft <NUM> and the lower link rotation shaft <NUM> in the front to back direction of the seat in the link portion 62a of the rear link <NUM>.

Further, a distance (the linear distance) D2 between the right and left link portions 61a of the front link <NUM> in the width direction of the seat is equal to a distance D4 between the right and left link portions 62a of the rear link <NUM> in the width direction of the seat.

Therefore, the rotation link <NUM> is smoothly operated.

Additionally, the distance D1 and the distance D2 may be different from each other and the distance D3 and the distance D4 may be different from each other.

As shown in <FIG>, the motor device <NUM> is a drive device for rotating the rotation link <NUM> and is attached to the lower link support member <NUM> through the motor attachment bracket 70a to be located at the horizontal position.

The motor device <NUM> mainly includes a motor body <NUM> which is elongated in the front to back direction of the seat, a transmission member <NUM> that is attached to the rear end portion of the motor body <NUM> and transmits the rotation energy of the motor body <NUM>, the pinion gear <NUM> which rotates in accordance with the rotation of the transmission member <NUM>, and a connecting rod <NUM> which connects the transmission member <NUM> and the motor attachment bracket 70a.

Further, as shown in <FIG>, the motor device <NUM> further includes the harness <NUM> which connects the motor body <NUM> and the ECU <NUM>.

The upper end portion of the motor body <NUM> is provided with a harness connection portion 71a for connecting one end portion of the harness <NUM> and the harness <NUM> connected to the harness connection portion 71a passes through the harness passage hole formed in the lower link support member <NUM>, extends downward, and is connected to the ECU <NUM> and the battery (not shown) provided at a predetermined position of the chassis B.

Additionally, the battery is a power storage device for supplying electric power to the motor body <NUM>.

As shown in <FIG>, the ECU <NUM> is an electronic control unit which controls the motor device <NUM>, controls the motor device <NUM> in accordance with the operation of an operation button <NUM> by the occupant, and transmits a signal for driving the motor device <NUM> to the motor device <NUM> when a predetermined condition is satisfied.

In the above-described configuration, the ECU <NUM> controls the motor device <NUM> in accordance with the traveling speed of the motorcycle. Accordingly, the rotation direction and the rotation amount of the rotation link <NUM> are controlled and the height position of the seat <NUM> is adjusted to a position according to the traveling speed.

Specifically, the ECU <NUM> includes a sensor <NUM> for detecting the traveling speed of the motorcycle and monitors the traveling speed. That is, the sensor <NUM> is a sensor that outputs a signal according to the detection result when detecting the traveling speed and the ECU <NUM> specifies the traveling speed by receiving an output signal from the sensor <NUM>.

After the traveling speed is specified, the ECU <NUM> compares the specified traveling speed with a predetermined threshold value stored in advance and determines whether or not to adjust the height of the seat <NUM>.

There are two types of predetermined threshold values, one is a "traveling threshold value" for determining whether or not to move the seat <NUM> from the normal position to the upper position, and the other is a "decelerating threshold value" for determining whether or not to move the seat <NUM> from the upper position to the normal position.

For example, when the specified traveling speed becomes equal to or larger than the "traveling threshold value", the ECU <NUM> controls the motor device <NUM> so that the seat <NUM> moves upward. Then, when the specified traveling speed becomes equal to or smaller than the "decelerating threshold value", the ECU <NUM> controls the motor device <NUM> so that the seat <NUM> moves downward.

As shown in <FIG> and <FIG>, the cover member <NUM> is a flexible leather cover (synthetic leather cover) which has a bag shape and is configured to enclose the upper link support member <NUM>, the lower link support member <NUM>, the rotation link <NUM>, and the motor device <NUM>.

As the resin material of the cover member <NUM>, polyvinyl chloride leather (PVC leather) is particularly preferable.

The cover member <NUM> is formed as a substantially hexahedron formed by joining terminals of a plurality of seat materials and a portion formed by joining the terminals of the seat materials is located on the ridge of the cover member.

Additionally, as a joining method of joining the terminals of the seat materials, it is preferable to use a method of welding (welder welding) after overlapping the terminals of the seat materials with each other, but the general joining method such as sewing or adhesion may be used without particular limitation.

The cover member <NUM> is configured to be folded from <FIG> when the shape of the cover member changes in accordance with the movement operation of the seat <NUM> (the rotation link <NUM>) and the seat <NUM> (the rotation link <NUM>) moves from the upper position to the normal position.

The cover overhanging portion <NUM> is formed so that a lateral portion corresponding to the rotation link <NUM> (the rear link <NUM>) in the cover member <NUM> projects outward when the cover member <NUM> is folded.

As shown in <FIG> and <FIG>, the cover overhanging portion <NUM> is formed by bending a part of the lateral portion 90b of the cover member <NUM> outward and is disposed at a peripheral position of a corner portion 90ba located at a position closest to the rear link <NUM> in a plurality of corner portions of the lateral portion 90b of the cover member <NUM>.

Specifically, the cover overhanging portion <NUM> is formed by welding the bent portion and is disposed between two ridges 90bb and 90bc defining the corner portion 90ba in the lateral portion 90b of the cover member <NUM>.

More specifically, the cover overhanging portion <NUM> extends along the center line between two ridges 90bb and 90bc defining the corner portion 90ba while starting from the corner portion 90ba located at a position closest to the rear link <NUM> serving as the drive link in the lateral portion 90b of the cover member <NUM>.

As shown in <FIG>, the upper surface (the upper portion 90d) of the cover member <NUM> is provided with an upper opening hole <NUM> for taking in and out the component of the seat height adjustment unit <NUM> and an upper cover attachment portion <NUM> provided at a position different from the upper opening hole <NUM> and used for the attachment to the upper link support member <NUM>.

The upper opening hole <NUM> includes a center hole portion 92a which is provided at the center portion of the upper surface of the cover member <NUM> and is elongated in the front to back direction of the seat and a plurality of slit hole portions 92b which radially extend from both end portions of the center hole portion 92a in the longitudinal direction and have a slit shape.

The upper cover attachment portion <NUM> is a substantially circular through hole and is disposed between the slit hole portions 92b arranged adjacent to each other in the cover member <NUM>.

Further, the upper cover attachment portion <NUM> is disposed at a position facing the cover attachment hole <NUM> in the upper surface of the upper link support member <NUM> and is formed at six positions in total.

In the above-described configuration, the cover member <NUM> is attached to the upper link support member <NUM> by fastening the clip member <NUM> from above while the upper cover attachment portion <NUM> and the cover attachment hole <NUM> communicate with each other.

Additionally, since each clip member <NUM> is fastened to form a triangular shape in each of the front portion and the rear portion of the seat, the clip member can be fastened relatively firmly.

As shown in <FIG>, the bottom surface (the lower portion 90e) of the cover member <NUM> is provided with a lower opening hole <NUM> used for taking in and out the component of the seat height adjustment unit <NUM> and passing the harness <NUM> therethrough and a lower cover attachment portion <NUM> provided at a position different from the lower opening hole <NUM> and used for the attachment to the lower link support member <NUM>.

The lower opening hole <NUM> includes a substantially rectangular center hole portion 94a which is provided at the center portion of the bottom surface of the cover member <NUM> and a plurality of slit hole portions 94b which radially extend from both end portions of the center hole portion 94a in the front to back direction of the seat and has a slit shape.

The lower cover attachment portion <NUM> is a substantially circular through hole and is disposed between the slit hole portions 94b arranged adjacent to each other in the cover member <NUM>.

Further, the lower cover attachment portion <NUM> is disposed at a position facing the cover attachment hole <NUM> in the bottom surface of the lower link support member <NUM> and is formed at six positions in total.

In the above-described configuration, the cover member <NUM> is attached to the lower link support member <NUM> by fastening the clip member <NUM> from below while the lower cover attachment portion <NUM> and the cover attachment hole <NUM> communicate with each other.

Further, in the above-described configuration, the lower opening hole <NUM> and the harness passage hole <NUM> communicate with each other. Therefore, the other end portion of the harness of which one end portion is connected to the motor device <NUM> extends to be exposed from the cover member <NUM> and can be connected to the ECU <NUM> provided on the chassis B.

In the above-described configuration, as shown in <FIG>, a method of taking the component of the seat height adjustment unit <NUM> into the cover member <NUM> is as below.

First, the component obtained by integrating the upper link support member <NUM>, the lower link support member <NUM>, the rotation link <NUM>, and the motor device <NUM> is compactly disposed at the normal position and in this state, the component is inserted into the cover member <NUM>. Specifically, the component is inserted into the cover member <NUM> by using the upper opening hole <NUM> of the cover member <NUM>.

At this time, the harness <NUM> passes through the lower opening hole <NUM> of the cover member <NUM> from the component to be exposed to the outside.

Then, after the component inserted into the cover member <NUM> is once deployed from the normal position to the upper position, the upper cover attachment portion <NUM> located on the upper surface of the cover member <NUM> and the cover attachment hole <NUM> of the upper link support member <NUM> are vertically overlapped with each other and are fastened by the clip member <NUM>.

Similarly, the lower cover attachment portion <NUM> located on the bottom surface of the cover member <NUM> and the cover attachment hole <NUM> of the lower link support member <NUM> are vertically overlapped with each other and are fastened by the clip member <NUM>.

Then, the seat support plate <NUM> is further attached to the upper surface of the component attached with the cover member <NUM> and the chassis attachment plate <NUM> is attached to the bottom surface of the component.

According to the above-described attachment method, the seat height adjustment unit <NUM> attached with the cover member <NUM> is completed.

Further, in the above-described configuration, the cover member <NUM> is configured to be folded from <FIG> when the seat <NUM> moves downward from the upper position to the normal position.

When the cover member <NUM> is folded, the upper portion (the upper end portion) of the lateral portion 90b in the cover member <NUM> is provided with a lateral protrusion <NUM> which protrudes outward in the width direction of the seat.

The lateral protrusion <NUM> is a bulging portion formed toward the front side of the seat while starting from the cover overhanging portion <NUM>.

Further, when the cover member <NUM> is folded, a lateral concave portion <NUM> which is recessed inward in the width direction of the seat is formed at the center portion of the lateral portion 90b.

The lateral concave portion <NUM> is a recess portion which is located directly below the lateral protrusion <NUM> and is formed to extend in the front to back direction of the seat.

Since the lateral protrusion <NUM> and the lateral concave portion <NUM> are formed, it is possible to absorb stress applied to the folded cover member <NUM> in a well-balanced manner.

Further, in the above-described configuration, as shown in <FIG>, when the cover member <NUM> is folded, a rear concave portion <NUM> which is recessed inward in the front to back direction of the seat is formed at the upper portion (the upper end portion) of the rear portion 90c in the cover member <NUM>.

The rear concave portion <NUM> is a recess portion which is formed to extend in the width direction of the seat. Since the rear concave portion <NUM> is formed, it is possible to absorb stress applied to the folded cover member <NUM> in a well-balanced manner. Further, the corner portion 90ba of the cover member <NUM> can be compactly folded.

Additionally, the corner portion 90ba of the cover member <NUM> is preferably formed to have an acute angle (<NUM>° or less) when viewed from the seat side. Then, the corner portion 90ba of the cover member <NUM> can be further compactly folded.

Additionally, the corner portion 90ba is a corner portion which is located in a direction in which the folded cover member <NUM> is deployed (diagonally rearward on the seat) among a plurality of corner portions in the lateral portion 90b of the cover member <NUM>.

Further, in the above-described configuration, as shown in <FIG>, the uppermost surface (uppermost end) of the upper portion 90d in the cover member <NUM> is disposed at a position higher than the uppermost end (ridge) of the rear portion 90c when the cover member <NUM> is deployed.

Then, since it is possible to suppress the occurrence of wrinkles and slack in the peripheral portion of the connection portion of the upper portion 90d and the rear portion 90c in the cover member <NUM> and to suppress the interference between the cover member <NUM> and the rotation link <NUM> (the rear link <NUM>), it is possible to smoothly operate the rotation link <NUM>.

Further, in the above-described configuration, as shown in <FIG>, when the cover member <NUM> is folded, a front concave portion <NUM> which is recessed downward is formed at the connection portion of the front portion 90a and the upper portion 90d in the cover member <NUM>.

The front concave portion <NUM> is a recess portion which is formed at the center portion in the width direction of the seat. Since the front concave portion <NUM> is formed, it is possible to absorb stress applied to the folded cover member <NUM> in a well-balanced manner.

Next, a seat height adjustment unit <NUM> of a second embodiment will be described with reference to <FIG>. In the following description, the description of the contents overlapping with the seat height adjustment unit <NUM> will be omitted.

The seat height adjustment unit <NUM> is mainly different from the seat height adjustment unit <NUM> in that an auxiliary cover 140ca and a holding plate 140cb are attached to a lower end portion of a rear wall portion 140c of an upper link support member <NUM>.

The auxiliary cover 140ca is a flexible leather cover which extends to hang down from the lower end portion of the rear wall portion 140c and covers the rotation link <NUM> and the motor device <NUM> from the rear side.

Specifically, the auxiliary cover 140ca includes a first extension portion which extends downward along a wall surface of the rear wall portion 140c and a second extension portion which continuously extends downward along a wall surface of a rear wall portion 150d of a lower link support member <NUM> from the first extension portion.

The holding plate 140cb is a plate made of a resin material that is elongated in the width direction of the seat, is attached to the front surface of the first extension portion of the auxiliary cover 140ca, and has a function of maintaining the shape of the auxiliary cover 140ca.

Additionally, the holding plate 140cb is disposed at a position facing the rotation link <NUM> (the rear link <NUM>) when the seat <NUM> moves downward from the upper position to the normal position.

With the above-described configuration, the auxiliary cover 140ca serves as a wall so that the rear portion 90c of the cover member <NUM> is not folded inward when the cover member <NUM> is folded.

Therefore, the rotation link <NUM> can be smoothly operated without interfering with the cover member <NUM>.

Next, a seat height adjustment unit <NUM> of a third embodiment will be described with reference to <FIG>.

The seat height adjustment unit <NUM> is mainly different from the seat height adjustment unit <NUM> in that a rear end portion of an upper link support member <NUM> is provided with an extension wall portion 240ca by extending a side wall portion 240b and a rear wall portion 240c downward.

The extension wall portion 240ca is a wall portion which continuously extends downward from the lower end portions of the side wall portion 240b and the rear wall portion 240c and covers a part of the rotation link <NUM> and the motor device <NUM> from the rear side.

Even in the above-described configuration, the extension wall portion 240ca serves as a wall so that the rear portion 90c of the cover member <NUM> is not folded inward when the cover member <NUM> is folded.

Next, a seat device S4 and a seat height adjustment unit <NUM> of a fourth embodiment will be described with reference to <FIG>.

The seat device S4 realizes a conveyance seat device capable of efficiently suppressing the vibration from being transmitted from the chassis B4 to the seat height adjustment unit <NUM> and appropriately protecting the component of the seat height adjustment unit <NUM>.

The seat device S4 is mainly different from the seat device S in that a vibration suppressing unit <NUM> for suppressing the vibration transmitted to the seat height adjustment unit <NUM> is provided.

As shown in <FIG> and <FIG>, the seat device S4 is a conveyance seat device including a seat <NUM>, the seat height adjustment unit <NUM>, and the vibration suppressing unit <NUM> and is set and attached onto the chassis B4.

The vibration suppressing unit <NUM> is attached into the chassis B and is disposed between the seat height adjustment unit <NUM> and the chassis B4 in the up to down direction.

As shown in <FIG>, the seat height adjustment unit <NUM> mainly includes a seat support plate <NUM>, a chassis attachment plate <NUM>, an upper link support member <NUM>, a lower link support member <NUM>, a rotation link <NUM>, a motor device <NUM>, an ECU <NUM>, and a cover member (not shown).

The upper surface of the seat support plate <NUM> is provided with a plurality of attachment holes <NUM> for attaching the upper link support member <NUM> and a plurality of relief holes <NUM> for suppressing the interference with a vibration suppressing member <NUM> to be described later.

The relief holes <NUM> are substantially circular through holes and are arranged at predetermined intervals in the width direction of the seat.

The upper surface of the chassis attachment plate <NUM> is provided with a plurality of attachment holes <NUM> for attaching the lower link support member <NUM>, a plurality of chassis assembly holes <NUM> used for the attachment onto the chassis B4, and a plurality of second chassis assembly holes <NUM> used for the attachment onto the chassis auxiliary plate B4a provided in the chassis B4.

As shown in <FIG> and <FIG>, the attachment hole <NUM>, the chassis assembly hole <NUM>, and the second chassis assembly hole <NUM> are respectively attached to the vibration suppressing member <NUM>.

As shown in <FIG>, the vibration suppressing unit <NUM> is for suppressing the vibration transmitted from the chassis B4 to the seat height adjustment unit <NUM> (the motor device <NUM>) and mainly includes an elastic vibration suppressing member <NUM> and a spacer <NUM> for holding the vibration suppressing member <NUM>.

The vibration suppressing member <NUM> is a hollow elastic member and is fitted and attached to each of the attachment hole <NUM>, the chassis assembly hole <NUM>, and the second chassis assembly hole <NUM>.

The vibration suppressing member <NUM> mainly includes a ring-shaped main body portion 391a and an upper flange portion 391b and a lower flange portion 391c which are respectively provided in the upper surface and the bottom surface of the main body portion 391a and are formed in a ring shape to have a width larger than that of the main body portion 391a.

The center portion of the vibration suppressing member <NUM> is provided with a through hole 391d which extends in the up to down direction and through which the spacer <NUM> penetrates.

Further, the upper surface of the upper flange portion 391b and the bottom surface of the lower flange portion 391c are respectively provided with a plurality of grooves 391e and 391f which radially extend from the through hole 391d in the radial direction. Therefore, the flexibility of the vibration suppressing member <NUM> is improved.

The spacer <NUM> is a cylindrical resin member, is used to position the vibration suppressing member <NUM> and maintains the shape of the vibration suppressing member <NUM>, and is fitted to the vibration suppressing member <NUM> from above.

Specifically, the spacer <NUM> mainly includes a cylindrical spacer body 392a which is fitted to the through hole 391d of the vibration suppressing member <NUM> and a ring-shaped flange portion 392b which is provided on the upper surface of the spacer body 392a, is formed to have a width larger than that of the spacer body 392a, and comes into contact with the upper surface or the bottom surface of the vibration suppressing member <NUM>.

The center portion of the spacer <NUM> is provided with a through hole 392c which extends in the up to down direction and through which an assembly bolt <NUM> penetrates.

In the above-described configuration, as shown in <FIG> and <FIG>, the upper flange portion 391b and the lower flange portion 391c are arranged to sandwich the chassis attachment plate <NUM> in the up to down direction when the vibration suppressing member <NUM> is fitted to the chassis assembly hole <NUM>.

Additionally, the vibration suppressing member <NUM> has the same configuration even when the vibration suppressing member is fitted to the attachment hole <NUM> and the second chassis assembly hole <NUM>.

Therefore, it is possible to easily position the vibration suppressing member <NUM>.

Further, in the above-described configuration, as shown in <FIG>, the chassis attachment plate <NUM> is attached onto the chassis B4 by assembling the assembly bolt <NUM> while the chassis assembly hole <NUM> and the assembly hole B4b communicate with each other.

Specifically, the assembly bolt <NUM> is attached to penetrate the spacer <NUM>, the vibration suppressing member <NUM>, the chassis assembly hole <NUM>, and the assembly hole B4b of the chassis B4 from above.

Therefore, it is possible to efficiently attach the chassis attachment plate <NUM> and the vibration suppressing unit <NUM> to the chassis B4.

Further, in the above-described configuration, as shown in <FIG> and <FIG>, the vibration suppressing member <NUM> includes a first vibration suppressing member 391A that is attached to the chassis assembly hole <NUM> (the second chassis assembly hole <NUM>) and a second vibration suppressing member 391B that is attached to the attachment hole <NUM>.

The first vibration suppressing member 391A is disposed to surround the motor device <NUM> and the second vibration suppressing member 391B.

In other words, the first vibration suppressing member 391A is disposed to sandwich the motor device <NUM> and the second vibration suppressing member 391B in the front to back direction of the seat and the width direction of the seat.

Further, the first vibration suppressing member 391A comes into contact with the upper surface of the chassis B4 (the chassis auxiliary plate B4a) while being fitted to the chassis assembly hole <NUM> (the second chassis assembly hole <NUM>).

Therefore, as shown in <FIG> and <FIG>, the seat height adjustment unit <NUM> is indirectly attached onto the chassis B4 through the vibration suppressing unit <NUM>. As a result, it is possible to efficiently suppress the vibration transmitted from the chassis B4 to the seat height adjustment unit <NUM>.

Further, in the above-described configuration, as shown in <FIG>, the second vibration suppressing member 391B is disposed at intervals in the front to back direction of the seat and the width direction of the seat and comes into contact with the bottom surface of the lower link support member <NUM> while being fitted to the attachment hole <NUM>.

Therefore, the seat height adjustment unit <NUM> (the motor device <NUM>) is indirectly attached onto the chassis attachment plate <NUM> through the vibration suppressing unit <NUM>.

As a result, it is possible to further efficiently suppress the vibration transmitted from the chassis B4 to the seat height adjustment unit <NUM>.

In the above-described embodiment, the cover member <NUM> is formed as a flexible cover and is preferably formed as a flexible and stretchable cover member.

In the above-described embodiment, as shown in <FIG> and <FIG>, the cover member <NUM> is formed in a bag shape and is configured to enclose the upper link support member <NUM>, the lower link support member <NUM>, the rotation link <NUM>, and the motor device <NUM>. However, the cover member can be modified without particular limitation.

For example, the cover member <NUM> may be a flexible cover member that covers at least the rotation link <NUM> from the outside in the front to back direction of the seat and the width direction of the seat.

Also in the configuration of the above-described cover member, it is possible to protect the operation portion from foreign matter such as dust and dirt from entering from the outside in order to smoothly operate the rotation link <NUM>.

Further, for example, the cover member <NUM> may be a flexible cover member that covers the rotation link <NUM> only from the outside in the width direction of the seat. Also in the configuration, it is possible to ensure the operation of the rotation link <NUM> compared to the related art.

In the above-described embodiment, as shown in <FIG> and <FIG>, the cover member <NUM> is configured to cover and enclose the front link <NUM> and the rear link <NUM>, but can be modified without particular limitation.

For example, the cover member <NUM> may be configured to cover only the drive link (in this embodiment, the rear link <NUM>) in the front link <NUM> and the rear link <NUM>.

Further, for example, the cover member <NUM> may be configured to cover only one link portion 62a provided with the sector gear portion <NUM> in the rear link <NUM> which is the drive link.

In the above-described embodiment, as shown in <FIG>, the cover overhanging portion <NUM> is formed by bending a part of the lateral portion of the cover member <NUM> outward and joining the bent portion, but is not particularly limited.

According to the invention, as shown in <FIG>, a lateral portion corresponding to the rotation link <NUM> (the rear link <NUM>) in the cover member <NUM> projects outward when the rotation link <NUM> moves from the upper position to the normal position so that the cover member <NUM> is folded.

That is, the cover overhanging portion <NUM> may be simply formed by making a crease on a part of the lateral portion of the cover member <NUM> to the outside.

In the above-described embodiment, as shown in <FIG> and <FIG>, a pair of the cover overhanging portions <NUM> is disposed at the lateral portion corresponding to the right and left link portions 62a in the rear link <NUM> which is the drive link, but is not particularly limited.

For example, the cover overhanging portion <NUM> may be disposed at each of the lateral portions corresponding to the front link <NUM> and the rear link <NUM>.

Further, for example, the cover overhanging portion <NUM> may be disposed only at the lateral portion corresponding to one link portion 62a provided with the sector gear portion <NUM> in the right and left link portions 62a of the rear link <NUM>.

In the above-described embodiment, as shown in <FIG> and <FIG>, the vibration suppressing member <NUM> is formed as an elastic member (elastic rubber member) having elasticity, but can be modified without particular limitation.

For example, the vibration suppressing member <NUM> may be an elastic spring member having elasticity or an elastic member having elasticity. Other known vibration suppressing members may be used.

In the above-described embodiment, as shown in <FIG>, the vibration suppressing member <NUM> is attached to the chassis attachment plate (the chassis assembly hole <NUM>, the attachment hole <NUM>), but may be attached to the chassis B4 (the assembly hole B4b) or the lower link support member <NUM> (the attachment hole <NUM>) without particular limitation.

In this embodiment, the conveyance seat device according to the present invention has been mainly described.

Claim 1:
A conveyance seat device (S), comprising:
a seat (<NUM>) being a saddle-type seat on which an occupant of a conveyance sits to straddle; and
a seat height adjustment unit (<NUM>) which is attached below the seat (<NUM>) and is able to adjust a height position of the seat,
wherein the seat height adjustment unit (<NUM>) includes a rotation link (<NUM>) which is configured to rotate together with the seat (<NUM>) with respect to a main body (B) of the conveyance to adjust the height position of the seat (<NUM>) and a flexible cover member (<NUM>) that covers the rotation link (<NUM>) from the outside in a front to back direction of the seat and a width direction of the seat,
wherein the seat height adjustment unit (<NUM>) includes a plate-shaped upper link support member (<NUM>) that is provided between the seat (<NUM>) and the rotation link (<NUM>) and is used so that an upper end portion of the rotation link (<NUM>) is attached thereto and a lower link support member (<NUM>) that is configured to be provided between the rotation link (<NUM>) and the main body (B) of the conveyance and is used so that a lower end portion of the rotation link (<NUM>) is attached thereto,
wherein the rotation link (<NUM>) is covered by the cover member (<NUM>), the upper link support member (<NUM>), and the lower link support member (<NUM>),
wherein the seat height adjustment unit (<NUM>) is able to move the seat (<NUM>) between a normal position and an upper position in which the seat (<NUM>) is moved above the normal position,
wherein the cover member (<NUM>) changes its shape in accordance with a movement operation of the seat (<NUM>) and is configured to be folded when the seat (<NUM>) moves from the upper position to the normal position,
characterized in that
the cover member (<NUM>) includes a cover overhanging portion (<NUM>) which is provided so that a lateral portion (90b) corresponding to the rotation link (<NUM>) in the cover member (<NUM>) projects outward when the cover member (<NUM>) is folded.