# US 9,751,429 B2 · Device for adjusting the seat length for a motor vehicle seat and seat comprising such a device

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- Number: US 9,751,429 B2
- Document ID: US9751429B2
- Status: Granted
- Kind: B2
- Application number: 13/984,261
- Filed: 2012-02-06
- Published: 2014-10-02
- Granted: 2017-09-05
- Earliest claimed: 2011-02-08
- Assignees: FAURECIA Sièges d'Automobile
- Applicants: Jerome Planson; Bernard Pradier; Charles-Louis Ducrohet; Laurent Chabert; Nicolas Navatte
- Inventors: Jerome Planson; Bernard Pradier; Charles-Louis Ducrohet; Laurent Chabert; Nicolas Navatte
- Web page: https://patentgrep.com/patent/US9751429B2

## CPC

- B60N 2/02246: {Electric motors therefor}
- B60N 2/0284: {Adjustable seat-cushion length (B60N2/0224 takes precedence)}
- B60N 2/02253: {characterised by the transmission between the electric motor and the seat or seat parts}
- B60N 2/02258: {characterised by the mounting of the electric motor for adjusting the seat}
- B60N: SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR

## Abstract

The invention relates to a device for adjusting seat length, comprising a seat front plate (12) that is movable relative to a seat frame (11), the plate (12) being mounted on a carriage that is slidably guided on a stationary mounting attached above said frame, the carriage and the mounting being situated between the frame and the seat front plate. The device comprises motor-driven control means for controlling the sliding of the carriage relative to the stationary mounting, the motor-driven control means (4) including a motor (43) arranged near the front of the seat, in front of the frame (1) and beneath the path of the seat front plate (12).

## Claims

### Claim 1

A device for adjusting the seating length of a motor vehicle seat, the device comprising:
a seating frame having a front crosspiece defining a front edge;
a seat nose plate for supporting a padding, the seat nose plate being mobile with respect to the seating frame;
a carriage slidably driven on a fixed support fixed to the seating frame, the seat nose plate being assembled on the carriage, the carriage and the fixed support located above the seating frame and under the seat nose plate; and
a motor-driven control means for controlling the sliding of the carriage with respect to the fixed support, the motor-driven control means comprising a motor located in front of the front edge of the seating frame and under a trajectory of the seat nose plate, and a screw-nut system arranged in a central space between the fixed support and the carriage.

### Claim 2 (depends on 1)

The device of claim 1, wherein the motor is fixed with respect to the seating frame.

### Claim 3 (depends on 2)

The device of claim 2, wherein the motor is fixed to the fixed support.

### Claim 4 (depends on 1)

The device of claim 1, wherein the driving of the carriage is performed by the screw-nut system which comprises a screw and a nut, the screw arranged longitudinally along a carriage sliding direction.

### Claim 5 (depends on 4)

The device of claim 4, wherein the screw of the screw-nut system is rotated by the motor, and the nut is fastened to the carriage.

### Claim 6 (depends on 1)

The device of claim 1, wherein the motor-driven control means further comprises a worm reducer.

### Claim 7

A motor vehicle seat comprising:
a seat bottom piece of adjustable length, the seat bottom piece comprising:
a seating frame having a front crosspiece defining a front edge; and
a seat nose plate for supporting a padding, the seat nose plate being mobile with respect to the seating frame; and
a device for adjusting the seating length, the device comprising:
a carriage slidably driven on a fixed support fixed to the seating frame, the seat nose plate being assembled on the carriage, the carriage and the fixed support located above the seating frame and under the seat nose plate; and
a motor-driven control means for controlling the sliding of the carriage with respect to the fixed support, the motor-driven control means comprising a motor located in front of the front edge of the seating frame and under a trajectory of the seat nose plate, and a screw-nut system arranged in a central space between the fixed support and the carriage, the motor hidden by the padding of the seat nose plate.

### Claim 8 (depends on 7)

The motor vehicle seat of claim 7, wherein the motor is fixed with respect to the seating frame.

### Claim 9 (depends on 8)

The motor vehicle seat of claim 8, wherein the motor is fixed to the fixed support.

### Claim 10 (depends on 7)

The motor vehicle seat of claim 7, wherein the driving of the carriage is performed by the screw-nut system which comprises a screw and a nut, the screw arranged longitudinally along the carriage sliding direction.

### Claim 11 (depends on 10)

The motor vehicle seat of claim 10, wherein the screw of the screw-nut system is rotated by the motor, and the nut is fastened to the carriage.

### Claim 12 (depends on 7)

The motor vehicle seat of claim 7, wherein the motor-driven control means further comprises a worm reducer.

### Claim 13

A device for adjusting the seating length of a motor vehicle seat, the device comprising:
a seating frame having a front edge;
a seat nose plate for supporting a padding, the seat nose plate being mobile with respect to the seating frame;
a carriage slidably driven on a fixed support fixed to the seating frame, the seat nose plate being assembled on the carriage, the carriage and the fixed support located above the seating frame and under the seat nose plate; and
a motor-driven control means for controlling the sliding of the carriage with respect to the fixed support, the motor-driven control means comprising a motor located in front of the front edge of the seating frame and under a trajectory of the seat nose plate, and a screw-nut system arranged in a central space between the fixed support and the carriage.