Child seat anchor assembly and methods of use

• US 7,401,834 B2
• Filed: 07/13/2005
• Issued: 07/22/2008
• Est. Priority Date: 07/13/2005
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust)
• Inventors: Browne, Alan L., Namuduri, Chandra S.
• Primary Examiner(s): PAPE, JOSEPH
• Application Number:
  US11/180,801
• Publication Number:
  US 20070013215A1
• Time in Patent Office: 1,105 Days
• Field of Search: 296/68.1, 296/65.02, 296/65.03, 297/253, 297/254, 297/216.11, 297/216.1
• US Class Current: 296/68.1
• CPC Class Codes: B60N 2/2806 for securing the child seat to the vehicle
• CPC Class Codes: B60N 2/2887 Fixation to a transversal anchorage bar, e.g. isofix

Abstract

A child seat anchor assembly includes a fixed portion, wherein the fixed portion is secured to a motor vehicle structural member or a child seat structural member; a latchable portion for releasable engagement with a child seat or a motor vehicle; an energy absorbing mechanism disposed between and in operative communication with the fixed portion and the latchable portion, wherein the energy absorbing mechanism comprises an active material; and a controller in operative communication with the active material, wherein the controller is operable to selectively apply an activation signal to the active material and effect a change in an attribute of the active material, wherein the change in the attribute results in force and acceleration adjusting energy absorption.

Claims

1. A child seat anchor assembly comprising:

a fixed portion, wherein the fixed portion is secured to a motor vehicle structural member or a child seat structural member;

a latchable portion for releasable engagement with a child seat or a motor vehicle;

an energy absorbing mechanism disposed between and in operative communication with the fixed portion and the latchable portion, wherein the energy absorbing mechanism comprises an active material; and

a controller in operative communication with the active material, wherein the controller is operable to selectively apply an activation signal to the active material and effect a change in an attribute of the active material, wherein the change in the attribute results in force and acceleration adjusting energy absorption.

2. The child seat anchor assembly of claim 1, wherein the active material comprises a shape memory alloy, ferromagnetic shape memory alloy, magnetorheological fluid, magnetorheological elastomer, electrorheological fluid, electrorheological elastomer, electroactive polymer, a piezoelectric material, a composite comprising at least one of the foregoing active materials with a non-active material, or a combination comprising at least one of the foregoing.

3. The child seat anchor assembly of claim 1, further comprising a sensor in operative communication with the controller, wherein the sensor is configured to provide information to the controller for selectively applying the activation signal to the active material.

4. The child seat anchor assembly of claim 3, wherein the sensor comprises a weight sensor, impact sensor, pre-impact sensor, or a combination comprising at least one of the foregoing sensors.

5. The child seat anchor assembly of claim 1, wherein the activation signal comprises a thermal activation signal, a magnetic activation signal, an electrical activation signal, a mechanical activation signal, a pneumatic activation signal, or a combination comprising at least one of the foregoing activation signals.

6. The child seat anchor assembly of claim 1, wherein the energy absorbing mechanism is a damper, actuator, or a combination comprising at least one of the foregoing energy absorbing mechanisms.

7. A child seat anchor assembly comprising:

a fixed portion, wherein the fixed portion is secured to a motor vehicle structural member or a child seat structural member;

a latchable portion for releasable engagement with a child seat or a motor vehicle;

a damper disposed between and in operative communication with the fixed portion and the latchable portion, wherein the damper comprises a rheology changing fluid; and

a controller in operative communication with the rheology changing fluid, wherein the controller is operable to selectively apply an activation signal to the rheology changing fluid and effect a change in a shear force of the rheology changing fluid, wherein the change in the shear force results in force and acceleration adjusting energy absorption.

8. The child seat anchor assembly of claim 7, further comprising a sensor in operative communication with the controller, wherein the sensor is configured to provide information to the controller for selectively applying the activation signal to the rheology changing fluid.

9. The child seat anchor assembly of claim 7, further comprising a valve for controlling the flow of the rheology changing fluid.

10. The child seat anchor assembly of claim 7, wherein the damper is a linear or rotary damper.

11. The child seat anchor assembly of claim 10, wherein the linear damper comprises a control structure comprising a sleeve, a seal at each end of the sleeve, the rheology changing fluid disposed between the seals, and the controller in proximity to the rheology changing fluid;

and a movable surface fixedly attached to a support member, wherein the support member is in sliding engagement with the seal and the rheology changing fluid of the control structure.

12. The child seat anchor assembly of claim 11, wherein the linear damper further comprises a spring, disposed within an annular recess of the support member, having one end fixedly attached to a transverse member and an other end fixedly attached to the movable surface.

13. The child seat anchor assembly of claim 10, wherein the linear damper comprises a movable surface fixedly attached to a shaft, wherein the shaft is slidably engaged with a stationary framing member;

a plurality of plates disposed in the stationary framing member, wherein each plate is substantially parallel to an adjacent plate, and wherein the plurality of plates are alternatingly attached to the shaft and the stationary framing member to define a space between adjacent plates;

the rheology changing fluid disposed in the space; and

the controller in proximity to the rheology changing fluid.

14. The child seat anchor assembly of claim 10, wherein the rotary damper comprises a cylindrically shaped sleeve disposed about and spaced radially from a shaft and fixedly attached to the shaft by a rotating disc, wherein the shaft is in rotatable communication with a cylindrically shaped housing disposed about and spaced radially from the sleeve, wherein the housing is sealed at each end with end caps;

a first seal disposed between an open end of the sleeve and an end cap;

a second seal disposed between the rotating disc and an end cap;

the rheology changing fluid disposed in a chamber defined by the housing, the sleeve and the seals; and

a controller disposed in proximity to the rheology changing fluid.

15. The child seat anchor assembly of claim 14, wherein the rotary damper further comprises a torsional spring, disposed on the shaft and within an annular recess of the sleeve.

16. A method, comprising:

securing a child seat to a structural member, wherein the securing comprises engaging a restraint of the child seat with a latchable portion of a child seat anchor assembly having a fixed portion secured to the structural member;

producing an activation signal with a controller;

applying the activation signal to an active material of a force limiting energy absorbing mechanism disposed between and in operative communication with the fixed portion and the latchable portion of the child seat anchor assembly, wherein the applying effects a change in an attribute of the active material; and

adjusting a force and/or deceleration to which the child seat is subjected with the energy absorbing mechanism.

17. The method of claim 16, further comprising sensing a deceleration event.

18. The method of claim 16, further comprising sensing a weight and/or anthropometry of the child seat and/or a child seat occupant.

19. The method of claim 16, further comprising sensing the magnitude of deceleration.

20. The method of claim 16, wherein a magnitude of a force generated by the force limiting energy absorber is selectively controlled based on information provided by a sensor in operative communication with the controller.