Vehicle-mounted seat device

Patent metadata

Field	Value
Publication number	US-11904744-B2
Application number	US-202017029421-A
Country	US
Kind code	B2
Filing date	Sep 23, 2020
Priority date	Sep 25, 2019
Publication date	Feb 20, 2024
Grant date	Feb 20, 2024

Abstract

A vehicle-mounted seat device includes an SB main frame, a back rest which the back of a seated person leans on, a relay disc fixed to the back rest, a first engagement member fixed with respect to the SB main frame at a position higher than the relay disc, an upper wire for suspending and holding the back rest from the first engagement member so as to be able to swing with respect to the SB main frame with the relay disc being the center, and a height adjustment mechanism constructed to be capable of pulling in part of the upper wire, so that an amount by which the upper wire is pulled in is changed to cause a change in disposed height of the back rest with respect to the SB main frame.

First claim

The invention claimed is:

1. A vehicle-mounted seat device, comprising:
a seat back main frame standing in a vehicle cabin;
a back rest which is configured to support the back of a seated person;
a relay disc fixed at a center of the back rest in a width direction;
a first engagement member fixed with respect to the seat back main frame at a position higher than the relay disc;
an upper wire provided between the relay disc and the first engagement member for suspending and holding the back rest so as to be able to swing with respect to the seat back main frame with the relay disc being the center; and
a height adjustment mechanism constructed to be capable of pulling in part of the upper wire for changing a disposed height of the back rest with respect to the seat back main frame by changing an amount by which the upper wire is pulled in, the height adjustment mechanism comprises a fixed pin and a movable pin movable with respect to the fixed pin, the upper wire hooked to the fixed pin and the movable pin, wherein when the movable pin moves away from the fixed pin, the upper wire is pulled in by an increased amount to elevate the relay disc.

2. The vehicle-mounted seat device according to claim 1 , wherein
the first engagement member and the relay disc are each provided with a pulley for hooking the upper wire, and
the upper wire is provided in a form of a closed loop routed through the first engagement member and the relay disc.

3. The vehicle-mounted seat device according to claim 1 , further comprising
a seat back sub frame mounted to the back rest and capable of swinging together with the back rest with respect to the seat back main frame, and
a seat back middle frame fixed to the seat back main frame, wherein
the back rest is suspended and held by the upper wire from the seat back middle frame so as to be able to swing with respect to the seat back middle frame, and
the back rest and the seat back sub frame are mounted to the seat back main frame through the seat back middle frame.

4. The vehicle-mounted seat device according to claim 3 , further comprising
a rear restraint bracket fixed to the seat back sub frame,
a front restraint bracket disposed in front of, and opposite to, the rear restraint bracket, and
a restraint component placed between the rear restraint bracket and the front restraint bracket, and provided as a linear member for defining a position of the seat back sub frame in a front-back direction with respect to the seat back middle frame, wherein
the front restraint bracket is mounted to the seat back middle frame so as to be elevated or lowered together with the seat back sub frame.

5. The vehicle-mounted seat device according to claim 4 , further comprising
a guide slit formed in a seat back middle frame and elongated in an up-down direction,
a connection bush fixed to the front restraint bracket and having a penetration hole formed at a center thereof, and
a connection pin inserted through the penetration hole of the connection bush and the guide slit, and having an end connected to the seat back sub frame, wherein
the connection pin is elevated or lowered together with the seat back sub frame to cause the front restraint bracket to be elevated or lowered.

6. The vehicle-mounted seat device according to claim 3 , further comprising
a pair of right and left second engagement members provided in a right-left direction of the relay disc, and fixed with respect to the seat back main frame,
a pair of right and left third engagement members provided in the right-left direction of the relay disc, and fixed with respect to the seat back sub frame,
a pair of right and left wires provided in a closed loop and routed through at least the second engagement member, the relay disc, and the third engagement member, wherein
when the amount by which the upper wire is pulled in is changed, the relay disc moves in a front-back direction, as well as an up-down direction, so as to balance tensions of the upper wire and the pair of right and left wires.

7. The vehicle-mounted seat device according to claim 6 , wherein
a second pulley for hooking a corresponding one of the pair of right and left wires is provided on either side of a central line of the relay disc in the right-left direction.

8. A vehicle-mounted seat device, comprising:
a seat back main frame standing in a vehicle cabin;
a back rest which is configured to support the back of a seated person;
a seat back sub frame mounted to the back rest and capable of swinging together with the back rest with respect to the seat back main frame;
a seat back middle frame fixed to the seat back main frame, a guide slit formed in a seat back middle frame and elongated in an up-down direction, wherein the back rest is suspended and held by the upper wire from the seat back middle frame so as to be able to swing with respect to the seat back middle frame, and wherein the back rest and the seat back sub frame are mounted to the seat back main frame through the seat back middle frame;
a rear restraint bracket fixed to the seat back sub frame;
a front restraint bracket disposed in front of, and opposite to, the rear restraint bracket;
a connection bush fixed to the front restraint bracket and having a penetration hole formed at a center thereof, a connection pin inserted through the penetration hole of the connection bush and the guide slit, and having an end connected to the seat back sub frame, wherein the connection pin is elevated or lowered together with the seat back sub frame to cause the front restraint bracket to be elevated or lowered;
a restraint component placed between the rear restraint bracket and the front restraint bracket, and provided as a linear member for defining a position of the seat back sub frame in a front-back direction with respect to the seat back middle frame, wherein the front restraint bracket is mounted to the seat back middle frame so as to be elevated or lowered together with the seat back sub frame;
a relay disc fixed at a center of the back rest in a width direction;
a first engagement member fixed with respect to the seat back main frame at a position higher than the relay disc;
an upper wire provided between the relay disc and the first engagement member for suspending and holding the back rest so as to be able to swing with respect to the seat back main frame with the relay disc being the center; and
a height adjustment mechanism constructed to be capable of pulling in part of the upper wire for changing a disposed height of the back rest with respect to the seat back main frame by changing an amount by which the upper wire is pulled in.

9. The vehicle-mounted seat device according to claim 8 , wherein
the first engagement member and the relay disc are each provided with a pulley for hooking the upper wire, and
the upper wire is provided in a form of a closed loop routed through the first engagement member and the relay disc.

10. The vehicle-mounted seat device according to claim 8 , further comprising
a pair of right and left second engagement members provided in a right-left direction of the relay disc, and fixed with respect to the seat back main frame,
a pair of right and left third engagement members provided in the right-left direction of the relay disc, and fixed with respect to the seat back sub frame,
a pair of right and left wires provided in a closed loop and routed through at least the second engagement member, the relay disc, and the third engagement member, wherein
when the amount by which the upper wire is pulled in is changed, the relay disc moves in a front-back direction, as well as an up-down direction, so as to balance tensions of the upper wire and the

Assignees

• Toyota Motor Co Ltd

Inventors

• Nagai Tetsuya
• Katoh Kohshi
• Sugimoto Takashi
• Oda Osamu
• Hada Masatoshi

Classifications

• B60N2/503 Primary

  attached to the backrest (B60N2/504 takes precedence) · CPC title

• B60N2/68 Primary

  Seat frames · CPC title

• B60N2/682

  Joining means · CPC title

• B60N2/505

  Adjustable suspension including height adjustment · CPC title

• B60N2002/2204

  Adjustable back-rest height or length · CPC title