Fitting for a vehicle seat and vehicle seat

Patent metadata

Field	Value
Publication number	US-9481270-B2
Application number	US-201314417940-A
Country	US
Kind code	B2
Filing date	Sep 27, 2013
Priority date	Oct 4, 2012
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

A vehicle seat fitting has a fitting parts ( 11, 12 ) have a sprocket ( 17 ) and guide segments ( 14 ), a bar ( 16 ) guided by the guide segments between a locked and unlocked state that interact with the sprocket. The bar has bar cams ( 16 a, 16 b ). An eccentric ( 27 ) is rotatably mounted around a rotation axis (A) and in a transition from unlocked to the locked, engages the bar with a force for clamping the bar against the sprocket. The eccentric has eccentric cams ( 28, 128 ) interacting with the bar cams. The first eccentric cam has a cam section ( 28.2 ) which runs in the peripheral direction concentrically around the axis. The cam section is arranged upstream in the closing direction of a further cam section ( 28.4 ) that has a cam contour running radially outwards downstream in the closing direction relative to the concentrically peripheral contour for clamping the bar against the sprocket.

First claim

The invention claimed is:

1. A fitting for a vehicle seat, the fitting comprising:
a first fitting part;
a second fitting part to be rotated relative to the first fitting part about an axis;
a toothed ring formed on the first fitting part;
guide segments formed on the second fitting part;
a locking bar radially displaceably guided by said guide segments between a locked state and an unlocked state, wherein the locked state cooperates with the toothed ring to lock the fitting and the locking bar has a first locking cam and a second locking cam;
a rotatably mounted eccentric, wherein:
during a transition from the unlocked state into the locked state, the eccentric is rotated in a closing direction and subjects the locking bar to a force for clamping the locking bar against the toothed ring;
for acting on the locking bar the eccentric comprises a first eccentric cam cooperating with the first locking cam and a second eccentric cam cooperating with the second locking cam;
the first eccentric cam has a cam portion which extends in a peripheral direction concentrically about the axis;
the cam portion is arranged counter to the closing direction in front of a further cam portion of the first eccentric cam; and
the further cam portion, counter to the closing direction, has a cam contour which extends radially outwardly relative to a concentric peripheral contour, for clamping the locking bar against the toothed ring.

2. The fitting as claimed in claim 1 , wherein the first eccentric cam has another cam portion as a first cam portion which defines a control contour by means of a rounded portion of a first flank of the eccentric cam extending substantially in the radial direction, with a contour of the eccentric cam extending substantially in the peripheral direction, and during the locking of the fitting the control contour controls the introduction of the locking bar into the toothed ring.

3. The fitting as claimed in claim 2 , wherein the cam portion, which extends in a peripheral direction concentrically about the axis, is a second cam portion counter to the closing direction that is adjacent to the first cam portion.

4. The fitting as claimed in claim 3 , wherein:
a fourth cam portion, counter to the closing direction, is arranged behind the second cam portion; and
the fourth cam portion, counter to the closing direction, has a cam contour extending radially outwardly relative to a concentric peripheral contour, for clamping the locking bar in the toothed ring.

5. The fitting as claimed in claim 3 , wherein:
a fourth cam portion, counter to the closing direction, is arranged behind the second cam portion;
a third cam portion is provided between the second cam portion and the fourth cam portion;
the third cam portion connects together continuously the second cam portion and the fourth cam portion.

6. The fitting as claimed in claim 2 , wherein:
the first eccentric cam has an additional cam portion counter to the closing direction and adjacent to the first cam portion; and
the additional cam portion, in the closing direction, has a cam contour extending radially outwardly relative to a concentric peripheral contour.

7. The fitting as claimed in claim 6 , wherein the cam portion which extends in a peripheral direction concentrically about the axis is a second cam portion and is adjacent to the additional cam portion.

8. The fitting as claimed in claim 1 , wherein:
in the locked unloaded state of the fitting, the first eccentric cam, in a first contact point, is in contact with the first locking cam and a gap exists between the second eccentric cam and the second locking cam; and
in the locked loaded state of the fitting, the locking bar is tilted between the guide segments and, as a result, the first eccentric cam is in contact with the first locking cam in the first contact point and the second eccentric cam is in contact with the second locking cam in a second contact point.

9. The fitting as claimed in claim 8 , wherein the gap between the second eccentric cam and the second locking cam is 0.05 mm to 0.5 mm.

10. The fitting as claimed in claim 8 , further comprising three additional locking bars such that four locking bars are provided, each of the locking bars in a normal case tilting in a direction opposing a respectively adjacent locking bars when the fitting is locked.

11. The fitting as claimed in claim 1 , wherein the cam contour extending radially outwardly has a wedge angle of 4° to 6°.

12. The fitting as claimed in claim 1 , further comprising an additional locking bar such that at least two locking bars are provided for only one said eccentric comprising the first eccentric cam and the second eccentric cam.

13. The fitting as claimed in claim 12 , wherein only the first eccentric has a cam portion extending concentrically about the axis.

14. A motor vehicle seat comprising a least one fitting, the fitting comprising:
a first fitting part;
a second fitting part to be rotated relative to the first fitting part about an axis;
a toothed ring formed on the first fitting part;
guide segments formed on the second fitting part;
a locking bar radially displaceably guided by said guide segments between a locked state and an unlocked state, wherein the locked state cooperates with the toothed ring to lock the fitting and the locking bar has a first locking cam and a second locking cam;
a rotatably mounted eccentric, wherein:
during a transition from the unlocked state into the locked state, the eccentric is rotated in a closing direction and subjects the locking bar to a force for clamping the locking bar against the toothed ring;
for acting on the locking bar the eccentric comprises a first eccentric cam cooperating with the first locking cam and a second eccentric cam cooperating with the second locking cam;
the first eccentric cam has a cam portion which extends in a peripheral direction concentrically about the axis;
the cam portion is arranged counter to the closing direction in front of a further cam portion of the first eccentric cam; and
the further cam portion, counter to the closing direction, has a cam contour which extends radially outwardly relative to a concentric peripheral contour, for clamping the locking bar against the toothed ring.

15. The vehicle seat as claimed in claim 14 , further comprising:
a seat part connected to one of the two fitting parts; and
a backrest connected to the other of the two fitting parts.

Assignees

• Johnson Controls Components Gmbh & Co Kg

Inventors

• Peters Christoph
• Lehmann Ulrich

Classifications

• B60N2/2356 Primary

  with internal pawls · CPC title

• B60N2/4435

  Operations & Transport · mapped topic

• B60N2/235 Primary

  by gear-pawl type mechanisms · CPC title

• B60N2/20

  the back-rest being tiltable, e.g. to permit easy access (B60N2/04, B60N2/22 {, B60N2/3002} take precedence) · CPC title

• B60N2/236 Primary

  linearly movable · CPC title