Multidirectional clock spring with rotating arbor

Patent metadata

Field	Value
Publication number	US-10752133-B2
Application number	US-201815978602-A
Country	US
Kind code	B2
Filing date	May 14, 2018
Priority date	May 12, 2017
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

A multidirectional clock spring assembly with a rotating arbor is disclosed for an automotive seat of the type wherein a seat back thereof may be pivoted between a rearward reclined position and a forward fold flat position overlying a seat cushion thereof. The clock spring provides a biasing force to move the seat back from the reclined position towards an upright position, and further for biasing the clock spring to provide a biasing force to move the seat back from the fold flat position towards the upright position.

First claim

The invention claimed is:

1. A reclining device for an automotive seat, the reclining device having a multidirectional clock spring assembly with a rotating arbor and a clock spring; wherein:
when the reclining device is in a full upright position, the clock spring assembly is in a transition position with the clock spring having a first amount of tension;
when the reclining device is rotated in a first direction from the full upright position to a full recline position which repositions the clock spring assembly into the full recline position, the clock spring provides a second amount of tension to bias the reclining device towards the full upright position; and
when the reclining device is rotated in a second direction from the full upright position to a fold flat position which repositions the clock spring assembly into the fold flat position, the clock spring provides a third amount of tension to bias the reclining device towards the full upright position.

2. The reclining device of claim 1 , further comprising the multidirectional clock spring assembly with the rotating arbor operationally coupled between a seat back and a seat cushion.

3. The reclining device of claim 2 , wherein when the seat back is rotated to the fold flat position, the tension in the clock spring assists in rotating the seat back from the fold flat position to the transition position.

4. The reclining device of claim 2 , wherein rotating the seat back from the full upright position towards the full recline position increases the tension in the clock spring; and
rotating the seat back from the full upright position towards the fold flat position increases the tension in the clock spring.

5. The reclining device of claim 1 , further comprising the multidirectional clock spring assembly with rotating arbor operationally coupled to a front cushion leg of an automotive seat.

6. A multidirectional clock spring assembly for an automotive seat, the clock spring assembly comprising:
a pivot shaft having an axis of rotation with a forward direction and a reverse direction of rotation;
a travelling spring tab configured to rotate about the pivot shaft axis of rotation and positioned at a first radial distance from the pivot shaft axis of rotation and having a transition position, the travelling spring tab having a front leading edge and a rear leading edge;
a stationary spring tab positioned at a second radial distance from the pivot shaft axis of rotation, the stationary spring tab comprising a forward leading edge and a reverse leading edge, and the reverse leading edge generally aligned with the rear leading edge when the travelling spring tab is in the transition position;
an arbor plate configured to rotate about the pivot shaft axis of rotation, the arbor plate further comprising an arbor plate tab and a spring arbor, the arbor plate tab positioned at a third radial distance from the pivot shaft axis of rotation, and the spring arbor positioned at a fourth radial distance from the pivot shaft axis of rotation, the arbor plate tab configured to be releasably engagable with the travelling spring tab and with the stationary spring tab, wherein an arbor leading edge is releasably engaged with the forward leading edge of the stationary spring tab when the travelling spring tab is in the transition position; and
a clock spring positioned adjacent the arbor plate and aligned with the pivot shaft axis of rotation, the clock spring having an internal spring end operatively connected to the spring arbor and an external spring end configured to be releasably engagable with the travelling spring tab and with the stationary spring tab;
when the travelling spring tab is in the transition position the external spring end is releasably engaged with the reverse leading edge of the stationary spring tab and with the rear leading edge of the travelling spring tab, the arbor leading edge is releasably engaged with the forward leading edge of the stationary spring tab, and the clock spring has a first amount of tension;
when the travelling spring tab rotates in the reverse direction away from the transition position, the external spring end disengages from the stationary spring tab and the external spring end is operationally engaged with the travelling spring tab; and
when the travelling spring tab rotates in the forward direction away from the transition position, the external spring end disengages from the travelling spring tab and operationally engages with the stationary spring tab, the front leading edge of the travelling spring tab releasably engages with the arbor leading edge.

7. The multidirectional clock spring assembly of claim 6 , wherein an increase in tension in the clock spring is proportional to an amount of movement of the travelling spring tab away from the transition position.

8. The multidirectional clock spring assembly of claim 6 , further comprising the multidirectional clock spring assembly with rotating arbor operationally coupled to a front cushion leg of an automotive seat, wherein:
the travelling spring tab is rigidly coupled to a front cushion leg and rotates about the pivot shaft axis of rotation when the front cushion leg is rotated about the pivot shaft axis of rotation; and
the stationary spring tab is rigidly coupled to a lower mounting flange.

9. The multidirectional clock spring assembly of claim 6 , further comprising a seat back operationally coupled to the pivot shaft and rotationally movable about the pivot shaft axis of rotation in the forward direction to a fold flat position and in the reverse direction to a full recline position;
wherein the travelling spring tab is rigidly fastened to a portion of the seat back such that rotating the seat back about the axis of rotation moves the travelling spring tab about the axis of rotation; and
when the travelling spring tab is in the transition position the seat back is in a full upright position.

10. The multidirectional clock spring assembly of claim 9 , wherein the clock spring provides a forward biasing force when the seat back is rotated in the reverse direction to the full recline position.

11. The multidirectional clock spring assembly of claim 9 , wherein the clock spring provides a rearward biasing force when the seat back is rotated in the forward direction to the fold flat position.

12. The multidirectional clock spring assembly of claim 9 , when the seat back is rotated towards the fold flat position, the travelling spring tab rotates the arbor plate tab towards the fold flat position which rotates the spring arbor and repositions the internal spring end to increase the tension in the clock spring.

13. The multidirectional clock spring assembly of claim 9 , wherein the tension in the clock spring is biased towards the full upright position when the seat back is rotated from the full upright position towards the fold flat position and when the seat back is rotated from the full upright position towards the full recline position.

14. The multidirectional clock spring assembly of claim 9 , wherein the external spring end is operationally engaged with at least one of the stationary spring tab and the travelling spring tab while the travelling spring tab moves from the full recline position to the fold flat position.

15. The multidirectional clock spring assembly of claim 9 , wherein when the seat back is rotated from the fold flat position to the full upright position, the travelling spring tab disengages from the arbor plate tab when the arbor plate tab releasably engages with the stationary spring tab.

16. The multidirectional clock spring assemb

Assignees

• Magna Seating Inc

Inventors

• Nacy Michael D

Classifications

• F16F1/10 Primary

  Spiral springs with turns lying substantially in plane surfaces {(F16F1/326 takes precedence)} · 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

• B60N2/22 Primary

  the back-rest being adjustable {(B60N2/2878 takes precedence)} · CPC title

• B60N2/206

  to a position in which it can be used as a support for objects, e.g. as a tray · CPC title