Control mechanism for seating unit

• US 7,165,811 B2
• Filed: 06/05/2003
• Issued: 01/23/2007
• Est. Priority Date: 09/12/2002
• Status: Active Grant

• Current Assignee: Steelcase Incorporated
• Original Assignee: Steelcase Development Corporation (Steelcase Incorporated)
• Inventors: Heidmann, Kurt R., Bodnar, David A., Bedford, Adam C., Karsten, Gary L.
• Primary Examiner(s): Cranmer; Laurie K.
• Application Number:
  US10/455,503
• Publication Number:
  US 20040051358A1
• Time in Patent Office: 1,328 Days
• Field of Search: 297/300.2, 297/300.1, 297/325, 297/302.1, 297/300.4
• US Class Current: 297/300.2
• CPC Class Codes: A47C 1/023 the parts being horizontally-adjustable seats ; Expandable seats or the like, e.g. seats with horizontally adjustable parts
• CPC Class Codes: A47C 1/03238 by means of peg-and-notch or pawl-and-ratchet mechanism
• CPC Class Codes: A47C 1/03255 with a central column, e.g. rocking office chairs
• CPC Class Codes: A47C 1/03261 characterised by elastic means
• CPC Class Codes: A47C 1/03274 of torsion type
• CPC Class Codes: A47C 1/03294 slidingly movable in the base frame, e.g. by rollers
• CPC Class Codes: A47C 31/04 Clamps for attaching flat elastic strips or flat meandering springs to frames
• CPC Class Codes: A47C 7/14 of adjustable shape; elastically mounted ; adaptable to a user contour or ergonomic seating positions movably-coupled seat and backrests with elastic adjustment means A47C1/03261; elastically-mounted back-rests or backrest-seat units in the base frame A47C7/44
• CPC Class Codes: A47C 7/28 with tensioned springs, e.g. of flat type
• CPC Class Codes: A47C 7/38 for the head adjustable coupled to reclining or easy chairs A47C1/036
• CPC Class Codes: A47C 7/46 with special, e.g. adjustable , lumbar region support profile; "Ackerblom" profile chairs

Abstract

A seating unit includes a base, a reclineable back, a seat, and a control operably supporting the back and the seat on the base for movement between upright and recline positions. The control includes a pair of flexible support members and a link that combine to operably support the seat and back for synchronous movement on the base upon recline. The flexible support member is stiff in a vertical direction for carrying a combined weight of the one component and of the seated user, but flexible in a horizontal direction to permit a swinging movement of its ends upon recline. The link is rigid and pivoted to the base for movement about a horizontal axis and also pivoted to the one component. By this arrangement, the flexible member and the link move the one component along a defined path during recline of the back.

Claims

1. A seating unit comprising:

a base, a reclineable back component, a seat component, and a control operably supporting the back component and the seat component on the base for synchronous movement between upright and reclined positions;

the control including at least one flexible support member supported on the base and also a link pivoted to the base for movement about a generally horizontal axis at a location spaced from the flexible support member;

the flexible support member having arms with end sections operably attached to at least one of the seat and back components and being stiff in a generally vertical direction for carrying a combined weight of the one component and of the seated user, but being flexible in a generally horizontal direction to permit synchronous movement upon recline;

the link being rigid and pivoted to the base and also pivotally coupled to the one component;

whereby the flexible member and the link move the one component along a defined path during recline of the back component.

2. The seating unit defined in claim 1, wherein the one component is the seat component.

3. The seating unit defined in claim 1, wherein the one component is the back component.

4. The seating unit defined in claim 1, wherein the at least one flexible support member includes first and second support members that engage the back component and the seat component, respectively.

5. The seating unit defined in claim 1, wherein the flexible member comprises a leaf-spring-like compliant member.

6. The seating unit defined in claim 1, wherein the link is pivoted to a rear portion of the seat component and causes an arcuate movement of the rear portion, and the flexible member is attached to a front portion of the seat component and causes a generally linear movement of the front portion.

7. The seating unit defined in claim 1, wherein the ends of the arms are movable along an upward angle upon recline so that the seat component and any seated user on the seat are lifted upon recline, whereby energy is absorbed during recline, to automatically provide a heavier person with added counterbalancing force during recline and also automatically provide a supplemental lifting force to the heavier person during movement from the recline position back toward the upright position.

8. The seating unit defined in claim 1, including a booster mechanism operably attached to the link, the booster mechanism having a torsion spring selectively engageable to boost and increase a support force provided during recline.

9. A seating unit comprising:

a base;

a seat component and a reclineable back component;

an underseat control for operably supporting the seat component and the back component for coordinated synchronous movement upon recline of the back component, the control including arms that are moveable in a generally horizontal direction for supporting at least one of the seat component and the back component;

the one component including a comfort surface structure, the comfort surface structure including horizontally-extending support wires adapted to individually flex in response to contours of a seated user.

10. The seating unit defined in claim 9, wherein the arms lift the seat component during recline to provide an automatic weight-activated increased back support force upon recline.

11. The seating unit defined in claim 9, wherein the wires include parallel linear sections that extend across the one component.

12. The seating unit defined in claim 9, wherein the one component is the seat component.

13. The seating unit defined in claim 9, wherein the one component is the back component.

14. The seating unit defined in claim 9, wherein the one component moves primarily in a horizontal direction but also with a vertical component of direction.

15. The seating unit defined in claim 9, including a link pivoted to a rear portion of the seat component and causes generally arcuate movement of the rear portion, and the flexible member is attached to a front portion of the seat component and causes a generally linear movement of the front portion.

16. The seating unit defined in claim 9, wherein the control includes at least one flexible member attached to the base and operably supporting one of the back and seat components.

17. The seating unit defined in claim 16, wherein the control includes a link pivoted to the seat and the base, the link being spaced from the flexible member.

18. A seating unit comprising:

a base;

a back component;

a seat component; and

an underseat control operably coupled to and supporting the back component and the seat component on the base for synchronous movement between upright and reclined positions;

the control including compliant arms that are moveable in a generally horizontal direction for supporting at least one of the seat component and the back component, and also including a link pivoted to the base and pivoted to the seat component for movement about a generally horizontal axis on the base at a location spaced from the arms.

19. The seating unit defined in claim 18, wherein the compliant arms are resilient and flexible in a first direction, but stiff and structural for carrying a load in a second direction perpendicular to the first direction.

20. The seating unit defined in claim 18, wherein the compliant arms include at least one first arm supporting the back component and at least one second arm supporting the seat component.

21. A seating unit comprising:

a base;

a back component;

a seat component; and

an underseat control operably coupled to and supporting the back component and the seat component on the base for synchronous movement between upright and reclined positions;

the control including compliant arms that are moveable in a generally horizontal direction for supporting at least one of the seat component and the back component, and also including a booster mechanism selectively engageable to bias the one component toward the upright position.

22. The seating unit defined in claim 21, including an on/off actuator for switching the booster mechanism between on and off positions.

23. A seating unit comprising:

a base;

a back component;

a seat component; and

an underseat control operably coupled to and supporting the back component and the seat component on the base for synchronous movement between upright and reclined positions;

the control including compliant arms that are moveable in a generally horizontal direction for supporting at least one of the seat component and the back component, and also including a back stop mechanism selectively engageable to limit movement of the one component toward the reclined position.

24. The seating unit defined in claim 23, wherein the compliant arms are resilient and flexible in a first direction, but stiff and structural for carrying a load in a second direction perpendicular to the first direction.

25. The seating unit defined in claim 24, wherein the compliant arms include at least one first arm supporting the back component and at least one second arm supporting the seat component.

26. The seating unit defined in claim 23, wherein at least one of the seat component and the back component include a frame defining a center opening and a plurality of independently-flexible wires extending across the opening for supporting a seated user;

and

a sheet covering the wires.

27. The seating unit defined in claim 26, wherein the wires are located on both the seat and back components.

28. The seating unit defined in claim 26, including a cushion under the sheet.

29. A seating unit comprising:

a seat;

a control mechanism having a plurality of compliant support arms, said support arms being relatively stiff in a generally vertical direction for supporting weight and relatively flexible in a generally horizontal direction for allowing movement of the weight; and

a back operably supported by at least one of said plurality of compliant support arms such that said back is allowed to move as said compliant support arms flex, thus providing a compliant back support system for said seating unit, wherein the compliant support arms include first and second support arms that engage the back and the seat, respectively.

30. The seating unit defined in claim 29, wherein the compliant support arms include leaf-spring-simulating compliant members.

32. The seating unit defined in claim 29, including a base supporting the support arms, and wherein the control mechanism includes a link pivoted to the base and also pivoted to one of the seat and back.

31. A seating unit comprising:

A seat;

a control mechanism having a plurality of compliant support arms, said support arms being relatively stiff in a generally vertical direction for supporting weight and relatively flexible in a generally horizontal direction for allowing movement of the weight; and

a back operably supported by at least one of said plurality of compliant support arms such that said back is allowed to move as said compliant support arms flex, thus providing a compliant back support system for said seating unit; and

including a base operably supporting the seat for forward movement upon recline of the back.

33. A seating unit, comprising:

a seat;

a control mechanism having at least one compliant support arm, a movable link and a stop device for selectively preventing said link from moving; and

a back attached to said at least one compliant support arm and said movable link, said at least one compliant support arm allowing said back to move as said at least one compliant support arm flexes to provide a compliant back support system for said seating unit even when said link is prevented from moving.

34. The seating unit defined in claim 33, wherein the at least one compliant support arm includes first and second support arms that engage the back and the seat, respectively.

35. The seating unit defined in claim 33, wherein the at least one compliant support arm includes a leaf-spring-like compliant member.

36. The seating unit defined in claim 33, including a base operably supporting the seat for forward movement upon recline of the back.