Height-adjustable vehicle seat having a crash locking unit

• US 20050231012A1
• Filed: 06/16/2005
• Published: 10/20/2005
• Est. Priority Date: 02/19/2003
• Status: Active Grant

• Current Assignee: Keiper Seating Mechanisms Company Limited
• Original Assignee: Keiper GmbH & Company KG (Johnson Controls International plc)
• Inventors: Teufel, Ingo, Schumann, Kai, Hammann, Heinrich, Braun, Dieter
• Granted Patent: US 7,044,543 B2
• Time in Patent Office: Days
• US Class Current: 297/216.150
• CPC Class Codes: B60N 2/1615 Parallelogram-like structure
• CPC Class Codes: B60N 2/1685 characterised by a lock
• CPC Class Codes: B60N 2/4214 longitudinal
• CPC Class Codes: B60N 2/42736 of the whole seat
• CPC Class Codes: B60N 2/43 Safety locks for back-rests B60N2/433

Abstract

In the case of a vehicle seat (1), in particular a motor vehicle seat, having a multi-bar linkage (4) which is defined by four link mechanisms and is intended for setting the seat height, and a crash locking unit (21) which, in the event of a crash, locks a frame (5) fixed on the vehicle structure and a rocker (8) to each other as two of the link mechanisms (5, 6, 7, 8, 9), a further link mechanism (7) being provided between the frame (5) and the rocker (8).

Claims

1. A vehicle seat for being mounted to a vehicle structure, and for operating advantageously in the event of a crash of predetermined magnitude, the vehicle seat comprising:

at least one multi-bar linkage, wherein the multi-bar linkage includes at least four link mechanisms, wherein prior to the crash of predetermined magnitude the multi-bar linkage is effective as a four-bar linkage for setting the seat'"'"'s height, and wherein the at least four link mechanisms includes at least

(a) a frame that is at least for being fixed with respect to the vehicle structure,

(b) a rocker, and

(c) a link mechanism positioned between the frame and the rocker; and

a crash locking unit for locking at least the frame and the rocker to one another in the event of the crash of predetermined magnitude.

2. The vehicle seat as claimed in claim 1, wherein:

the multi-bar linkage is operative for at least temporarily becoming effective as a five-bar linkage in response to the crash of predetermined magnitude, and

the crash locking unit is operative so that the locking, which is provided by the crash locking unit in response to the crash of predetermined magnitude, causes the multi-bar linkage to become effective as a rigid three-bar linkage, whereby the multi-bar linkage becomes effective as the rigid three-bar linkage in response to the crash of predetermined magnitude.

3. The vehicle seat as claimed in claim 1, wherein the crash locking unit is operative so that the locking, which is provided by the crash locking unit in response to the crash of predetermined magnitude, occurs in a positively controlled manner at least partially in response to a change in geometry of the multi-bar linkage.

4. The vehicle seat as claimed in claim 3, wherein the change in geometry of the multi-bar linkage takes place reversibly.

5. The vehicle seat as claimed in claim 1, wherein:

the crash locking unit includes a latch and a mating element,

the crash locking unit is operative so that the locking, which is provided by the crash locking unit in response to the crash of predetermined magnitude, includes the latch and the mating element being engaged to one another,

the latch is effective in two directions,

the latch is pivotably mounted on one of the frame and the rocker, and

mating element is fixedly attached to the other of the frame and the rocker.

6. The vehicle seat as claimed in claim 5, wherein the latch is coupled to the link mechanism positioned between the frame and the rocker.

7. The vehicle seat as claimed in claim 5, wherein the latch is coupled, by way of a slot and a pin, to the link mechanism positioned between the frame and the rocker.

8. The vehicle seat as claimed in claim 1, further comprising a second locking unit, wherein for two adjacent link mechanisms of the at least four link mechanisms, the second locking unit rigidly connects the two adjacent link mechanisms together prior to the crash of predetermined magnitude.

9. The vehicle seat as claimed in claim 8, wherein:

the second locking unit provides a frictional interaction by way of which the second locking unit rigidly connects the two adjacent link mechanisms together prior to the crash of predetermined magnitude, and

the second locking unit is operative for opening after a limit force is exceeded in response to the crash of predetermined magnitude, so that relative movement can occur between the two adjacent link mechanisms.

10. The vehicle seat as claimed in claim 9, wherein the second locking unit includes:

a locking bar pivotably mounted on a first of the two adjacent link mechanisms,

a counterpart on a second of the two adjacent link mechanisms, and

a spring between the locking bar and the first of the two adjacent link mechanisms.

11. The vehicle seat as claimed in claim 10, wherein at least one of the locking bar and the counterpart has two different functional surfaces which define different parameters for two opposite directions in which the crash of predetermined magnitude can occur.

12. The vehicle seat as claimed in claim 2, wherein the crash locking unit is operative so that the locking, which is provided by the crash locking unit in response to the crash of predetermined magnitude, occurs in a positively controlled manner at least partially in response to a change in geometry of the multi-bar linkage from the four-bar linkage to the five-bar linkage.

13. The vehicle seat as claimed in claim 2, wherein:

the crash locking unit includes a latch and a mating element,

the crash locking unit is operative so that the locking, which is provided by the crash locking unit in response to the crash of predetermined magnitude, includes the latch and the mating element being engaged to one another,

the latch is effective in two directions,

the latch is pivotably mounted on one of the frame and the rocker, and

mating element is fixedly attached to the other of the frame and the rocker.

14. The vehicle seat as claimed in claim 2, further comprising a second locking unit, wherein for two adjacent link mechanisms of the at least four link mechanisms, the second locking unit rigidly connects the two adjacent link mechanisms together prior to the crash of predetermined magnitude.

15. The vehicle seat as claimed in claim 1, further comprising a second locking unit, wherein:

for two adjacent link mechanisms of the at least four link mechanisms, the second locking unit rigidly connects the two adjacent link mechanisms together prior to the crash of predetermined magnitude, whereby the multi-bar linkage is effective as the four-bar linkage prior to the crash of predetermined magnitude;

the second locking unit is operative, in response to the crash of predetermined magnitude, for allowing relative movement between the two adjacent link mechanisms, whereby the multi-bar linkage is at least temporarily effective as a five-bar linkage in response to the crash of predetermined magnitude; and

the crash locking unit is operative so that the locking, which is provided by the crash locking unit in response to the crash of predetermined magnitude, is provided at least partially as a result of the multi-bar linkage becoming effective as the five-bar linkage in response to the crash of predetermined magnitude.

16. The vehicle seat as claimed in claim 15, wherein:

the second locking unit provides a frictional interaction by way of which the second locking unit rigidly connects the two adjacent link mechanisms together prior to the crash of predetermined magnitude, and

in response to the crash of predetermined magnitude, the second locking unit opens so that the relative movement can occur between the two adjacent link mechanisms.

17. The vehicle seat as claimed in claim 15, wherein:

the crash locking unit includes a latch and a mating element,

the crash locking unit is operative so that the locking, which is provided by the crash locking unit in response to the crash of predetermined magnitude, includes the latch and the mating element being engaged to one another,

the latch is effective in two directions,

the latch is pivotably mounted on one of the frame and the rocker,

the mating element is fixedly attached to the other of the frame and the rocker, and

the latch is coupled to the link mechanism positioned between the frame and the rocker.

18. The vehicle seat as claimed in claim 1, further comprising a second locking unit, wherein:

prior to the crash of predetermined magnitude, the second locking unit rigidly connects together the rocker and the link mechanism positioned between the frame and the rocker, whereby the multi-bar linkage is effective as the four-bar linkage prior to the crash of predetermined magnitude;

the second locking unit is operative, in response to the crash of predetermined magnitude, for allowing relative pivoting between the rocker and the link mechanism positioned between the frame and the rocker, whereby the multi-bar linkage is at least temporarily effective as a five-bar linkage in response to the crash of predetermined magnitude; and

the crash locking unit is operative so that the locking, which is provided by the crash locking unit in response to the crash of predetermined magnitude, is provided at least partially as a result of the multi-bar linkage becoming effective as the five-bar linkage in response to the crash of predetermined magnitude.

19. The vehicle seat as claimed in claim 18, wherein:

the crash locking unit includes a latch and a mating element,

the crash locking unit is operative so that the locking, which is provided by the crash locking unit in response to the crash of predetermined magnitude, includes the latch and the mating element being engaged to one another,

the latch is effective in two directions,

the latch is pivotably mounted on one of the frame and the rocker,

the mating element is fixedly attached to the other of the frame and the rocker,

the latch is coupled to the link mechanism positioned between the frame and the rocker,

prior to the crash of predetermined magnitude, the second locking unit provides a frictional interaction by way of which the second locking unit rigidly connects the rocker and the link mechanism positioned between the frame and the rocker, and

in response to the crash of predetermined magnitude, the second locking unit opens so that relative pivoting can occur between the rocker and the link mechanism positioned between the frame and the rocker.

20. The vehicle seat as claimed in claim 1, further comprising a lower seat rail, wherein the frame is an upper seat rail that is cooperative with the lower seat rail to provide a longitudinal adjuster for the vehicle seat.