Load compensator for height adjustable table

• US 9,826,825 B1
• Filed: 07/23/2015
• Issued: 11/28/2017
• Est. Priority Date: 12/17/2004
• Status: Active Grant

• Current Assignee: Steelcase Incorporated
• Original Assignee: Steelcase Incorporated
• Inventors: Jones, David K., Heidmann, Kurt, Andres, Todd
• Primary Examiner(s): WUJCIAK, ALFRED J
• Application Number:
  US14/807,316
• Time in Patent Office: 859 Days
• Field of Search: 248616, 248589, 248584, 2481252, 2481258, 24829511, 248157, 248161, 248404, 2484061, 248408, 4031091-1098, 10814719, 108147, 1081441, 108146, 108150
• CPC Class Codes: A47B 13/023 with a central column
• CPC Class Codes: A47B 2013/024 being assembled to a base
• CPC Class Codes: A47B 2200/0051 Telescopic
• CPC Class Codes: A47B 2200/0052 with two telescopic parts
• CPC Class Codes: A47B 9/00 Tables with tops of variable height lecterns with variable height A47B19/06; school forms or desks with variable height A47B39/02, A47B41/02; seats with variable height A47C3/20
• CPC Class Codes: A47B 9/02 with balancing device, e.g. by springs, by weight
• CPC Class Codes: A47B 9/12 with flexible height-adjusting means, e.g. rope, chain
• CPC Class Codes: A47B 9/20 Telescopic guides

Abstract

A table assembly comprising at least one leg assembly including a first elongated member having a length dimension parallel to a substantially vertical extension axis and at least one second elongated member supported by the first member for sliding motion along the extension axis between extended and retracted positions, a load compensator including a spring having first and second ends supported by the second elongated member and operatively coupled to the first elongated member, respectively, a table top supported by the second member and a locking assembly including a lock housing supported by the leg assembly and forming a lock housing passageway that passes there through, a first coupler supported by the leg assembly and including at least an elongated central portion that extends through the lock housing passageway and a locking member moveable between a locked position wherein the locking member is operably linked to the first coupler to restrict movement and an unlocked position wherein the locking member is de-linked from the first coupler.

Claims

1. A table assembly comprising:

at least one leg assembly including;

(i) at least one base;

(ii) at least one first elongated member having a length dimension parallel to a substantially vertical extension axis, the first elongated member being supported by the base; and

(iii) at least one second elongated member supported by a respective one of the first elongated members for sliding motion along the extension axis between at least an extended position and a retracted position;

a load compensator supported by the leg assembly, the load compensator including a spring that generates a variable spring force that depends at least in part on a degree of a spring loading, the spring having first and second ends at opposite ends of a length dimension of the spring, the first end of the spring operatively coupled to the second elongated member;

a table top supported by the at least one second member such that the table top can be supported at varying elevations above the at least one base; and

a locking assembly including;

(i) a lock housing supported by the leg assembly substantially stationary with respect to the table top member so that the lock housing moves with the table top as the second elongated member moves between the extended and retracted positions, the lock housing forming a lock housing passageway that passes through the lock housing;

(ii) a first coupler supported by the leg assembly and including at least an elongated central portion that extends through the lock housing passageway; and

(iii) a locking member mounted within the lock housing proximate the lock housing passageway and moveable between a locked position wherein the locking member is operably linked to the first coupler to restrict movement of the first coupler relative to the lock housing and an unlocked position wherein the locking member is de-linked from the first coupler to allow movement of the first coupler relative to the lock housing and through the lock housing passageway, wherein the load compensator includes at least one strand having first and second strand ends, the first end of the strand linked to the second end of the spring and the second end of the strand operably linked to the first elongated member.

2. The table assembly of claim 1 wherein the housing passageway is substantially parallel to the length dimension of the spring.

3. The table assembly of claim 1 wherein the elongated central portion of the first coupler is substantially parallel to the length dimension of the spring.

4. The table assembly of claim 1 further including a snail cam pulley supported by the leg assembly for movement with the second elongated member as the second elongated member moves between the extended and retracted positions, the strand linked to the snail cam pulley and the snail cam pulley operably linked to the second elongated member.

5. The table assembly of claim 4 wherein an intermediate portion of the strand is wrapped about the snail cam pulley and the second end of the strand is linked to the first elongated member.

6. The table assembly of claim 1 wherein the load compensator includes at least one strand having first and second strand ends, the first end of the strand operably linked to the second end of the spring and the second end of the strand linked to the first elongated member.

7. The table assembly of claim 6 further including a snail cam pulley supported by the leg assembly for movement with the second elongated member as the second elongated member moves between the extended and retracted positions, the strand linked to the snail cam pulley.

8. The table assembly of claim 7 wherein an intermediate portion of the strand is wrapped about the snail cam pulley and the first end of the strand is linked to the second end of the spring.

9. The table assembly of claim 1 wherein one of the first and second elongated members forms a first internal passageway and wherein the other of the first and second elongated members is received at least in part in the first internal passageway when the second elongated member is in each of the extended and retracted positions.

10. The table assembly of claim 9 wherein the first elongated member forms the first internal passageway.

11. The table assembly of claim 9 wherein the other of the first and second elongated members forms a second internal passageway, the assembly further including at least one strand operably linked to the second end of the spring and linked to the first elongated member, at least a portion of the strand extending into the second internal passageway.

12. The assembly of claim 11 further including a pulley mounted to the second elongated member and located in the second internal passageway, the strand wrapping around the pulley within the second internal passageway.

13. The assembly of claim 12 wherein the second elongated member forms the second internal passageway and wherein the pulley includes a snail cam pulley, the spring located at least in part in the second internal passageway.

14. The assembly of claim 1 further including a preloader supported by the first elongated member and operably linked to the spring, the preloader applying a preload force to the spring when the second elongated member is in the extended position, the assembly further including an adjuster for adjusting the preload force applied by the preloader.

15. The table assembly of claim 1 wherein the locking member is biased toward the locked position.

16. The table assembly of claim 15 wherein the locking member is a lever, the assembly further including a lock spring that biases the lever into the locked position.

17. The table assembly of claim 1 wherein the first elongated member forms an internal passageway and wherein the second elongated member is received at least in part in the first internal passageway, a top end of the second elongated member extending out the top of the first internal passageway.

18. The table assembly of claim 1 wherein the first coupler includes a threaded shaft member.

19. A table assembly comprising:

at least one leg assembly including;

(i) at least one base;

(ii) at least one first elongated member having a length dimension parallel to a substantially vertical extension axis, the first elongated member being supported by the base; and

(iii) at least one second elongated member supported by a respective one of the first elongated members for sliding motion along the extension axis between at least an extended position and a retracted position;

a load compensator supported by the leg assembly, the load compensator including a spring that generates a variable spring force that depends at least in part on a degree of a spring loading, the spring having first and second ends at opposite ends of a length dimension of the spring, the first end of the spring operatively coupled to the second elongated member;

a table top supported by the at least one second member such that the table top can be supported at varying elevations above the at least one base; and

a locking assembly including;

(i) a lock housing supported by the leg assembly substantially stationary with respect to the table top member so that the lock housing moves with the table top as the second elongated member moves between the extended and retracted positions, the lock housing forming a lock housing passageway that passes through the lock housing;

(ii) a first coupler supported by the leg assembly and including at least an elongated central portion that extends through the lock housing passageway; and

(iii) a locking member mounted within the lock housing proximate the lock housing passageway and moveable between a locked position wherein the locking member is operably linked to the first coupler to restrict movement of the first coupler relative to the lock housing and an unlocked position wherein the locking member is de-linked from the first coupler to allow movement of the first coupler relative to the lock housing and through the lock housing passageway, wherein the load compensator includes at least one strand having first and second strand ends, the first end of the strand operably linked to the second end of the spring and the second end of the strand linked to the first elongated member.

20. The table assembly of claim 19 wherein the housing passageway is substantially parallel to the length dimension of the spring.

21. The table assembly of claim 19 wherein the elongated central portion of the first coupler is substantially parallel to the length dimension of the spring.

22. The table assembly of claim 19 further including a snail cam pulley supported by the leg assembly for movement with the second elongated member as the second elongated member moves between the extended and retracted positions, the strand linked to the snail cam pulley.

23. The table assembly of claim 22 wherein an intermediate portion of the strand is wrapped about the snail cam pulley and the first end of the strand is linked to the second end of the spring.

24. The table assembly of claim 19 wherein one of the first and second elongated members forms a first internal passageway and wherein the other of the first and second elongated members is received at least in part in the first internal passageway when the second elongated member is in each of the extended and retracted positions.

25. The table assembly of claim 24 wherein the first elongated member forms the first internal passageway.

26. The table assembly of claim 24 wherein the other of the first and second elongated members forms a second internal passageway, the assembly further including at least one strand operably linked to the second end of the spring and linked to the first elongated member, at least a portion of the strand extending into the second internal passageway.

27. The assembly of claim 26 further including a pulley mounted to the second elongated member and located in the second internal passageway, the strand wrapping around the pulley within the second internal passageway.

28. The assembly of claim 27 wherein the second elongated member forms the second internal passageway and wherein the pulley includes a snail cam pulley, the spring located at least in part in the second internal passageway.

29. The assembly of claim 19 further including a preloader supported by the first elongated member and operably linked to the spring, the preloader applying a preload force to the spring when the second elongated member is in the extended position, the assembly further including an adjuster for adjusting the preload force applied by the preloader.

30. The table assembly of claim 19 wherein the locking member is biased toward the locked position.

31. The table assembly of claim 30 wherein the locking member is a lever, the assembly further including a lock spring that biases the lever into the locked position.

32. The table assembly of claim 19 wherein the first elongated member forms an internal passageway and wherein the second elongated member is received at least in part in the first internal passageway, a top end of the second elongated member extending out the top of the first internal passageway.

33. The table assembly of claim 19 wherein the first coupler includes a threaded shaft member.

34. A table assembly comprising:

at least one leg assembly including;

(i) at least one base;

(ii) at least one first elongated member having a length dimension parallel to a substantially vertical extension axis, the first elongated member being supported by the base; and

(iii) at least one second elongated member supported by a respective one of the first elongated members for sliding motion along the extension axis between at least an extended position and a retracted position;

a load compensator supported by the leg assembly, the load compensator including a spring that generates a variable spring force that depends at least in part on a degree of a spring loading, the spring having first and second ends at opposite ends of a length dimension of the spring, the first end of the spring operatively coupled to the second elongated member;

a table top supported by the at least one second member such that the table top can be supported at varying elevations above the at least one base; and

a locking assembly including;

(i) a lock housing supported by the leg assembly substantially stationary with respect to the table top member so that the lock housing moves with the table top as the second elongated member moves between the extended and retracted positions, the lock housing forming a lock housing passageway that passes through the lock housing;

(ii) a first coupler supported by the leg assembly and including at least an elongated central portion that extends through the lock housing passageway; and

(iii) a locking member mounted within the lock housing proximate the lock housing passageway and moveable between a locked position wherein the locking member is operably linked to the first coupler to restrict movement of the first coupler relative to the lock housing and an unlocked position wherein the locking member is de-linked from the first coupler to allow movement of the first coupler relative to the lock housing and through the lock housing passageway, wherein one of the first and second elongated members forms a first internal passageway and wherein the other of the first and second elongated members is received at least in part in the first internal passageway when the second elongated member is in each of the extended and retracted positions and wherein the other of the first and second elongated members forms a second internal passageway, the assembly further including at least one strand operably linked to the second end of the spring and linked to the first elongated member, at least a portion of the strand extending into the second internal passageway.

35. The table assembly of claim 34 wherein the housing passageway is substantially parallel to the length dimension of the spring.

36. The table assembly of claim 34 wherein the elongated central portion of the first coupler is substantially parallel to the length dimension of the spring.

37. The assembly of claim 34 further including a pulley mounted to the second elongated member and located in the second internal passageway, the strand wrapping around the pulley within the second internal passageway.

38. The assembly of claim 37 wherein the second elongated member forms the second internal passageway and wherein the pulley includes a snail cam pulley, the spring located at least in part in the second internal passageway.

39. The table assembly of claim 37 wherein the first elongated member forms the first internal passageway.

40. The assembly of claim 34 further including a preloader supported by the first elongated member and operably linked to the spring, the preloader applying a preload force to the spring when the second elongated member is in the extended position, the assembly further including an adjuster for adjusting the preload force applied by the preloader.

41. The table assembly of claim 34 wherein the locking member is biased toward the locked position.

42. The table assembly of claim 41 wherein the locking member is a lever, the assembly further including a lock spring that biases the lever into the locked position.

43. The table assembly of claim 34 wherein the first elongated member forms an internal passageway and wherein the second elongated member is received at least in part in the first internal passageway, a top end of the second elongated member extending out the top of the first internal passageway.

44. The table assembly of claim 34 wherein the first coupler includes a threaded shaft member.

45. A table assembly comprising:

at least one leg assembly including;

(i) at least one base;

(ii) at least one first elongated member having a length dimension parallel to a substantially vertical extension axis, the first elongated member being supported by the base; and

(iii) at least one second elongated member supported by a respective one of the first elongated members for sliding motion along the extension axis between at least an extended position and a retracted position;

a load compensator supported by the leg assembly, the load compensator including a spring that generates a variable spring force that depends at least in part on a degree of a spring loading, the spring having first and second ends at opposite ends of a length dimension of the spring, the first end of the spring operatively coupled to the second elongated member;

a table top supported by the at least one second member such that the table top can be supported at varying elevations above the at least one base; and

a locking assembly including;

(i) a lock housing supported by the leg assembly substantially stationary with respect to the table top member so that the lock housing moves with the table top as the second elongated member moves between the extended and retracted positions, the lock housing forming a lock housing passageway that passes through the lock housing;

(ii) a first coupler supported by the leg assembly and including at least an elongated central portion that extends through the lock housing passageway; and

(iii) a locking member mounted within the lock housing proximate the lock housing passageway and moveable between a locked position wherein the locking member is operably linked to the first coupler to restrict movement of the first coupler relative to the lock housing and an unlocked position wherein the locking member is de-linked from the first coupler to allow movement of the first coupler relative to the lock housing and through the lock housing passageway, further including a preloader supported by the first elongated member and operably linked to the spring, the preloader applying a preload force to the spring when the second elongated member is in the extended position, the assembly further including an adjuster for adjusting the preload force applied by the preloader.

46. The table assembly of claim 45 wherein the housing passageway is substantially parallel to the length dimension of the spring.

47. The table assembly of claim 45 wherein the elongated central portion of the first coupler is substantially parallel to the length dimension of the spring.

48. The table assembly of claim 45 wherein one of the first and second elongated members forms a first internal passageway and wherein the other of the first and second elongated members is received at least in part in the first internal passageway when the second elongated member is in each of the extended and retracted positions.

49. The table assembly of claim 48 wherein the first elongated member forms the first internal passageway.

50. The table assembly of claim 45 wherein the locking member is biased toward the locked position.

51. The table assembly of claim 50 wherein the locking member is a lever, the assembly further including a lock spring that biases the lever into the locked position.

52. The table assembly of claim 45 wherein the first elongated member forms an internal passageway and wherein the second elongated member is received at least in part in the first internal passageway, a top end of the second elongated member extending out the top of the first internal passageway.

53. The table assembly of claim 45 wherein the first coupler includes a threaded shaft member.

54. A table assembly comprising:

at least one leg assembly including;

(i) at least one base;

(ii) at least one first elongated member having a length dimension parallel to a substantially vertical extension axis, the first elongated member being supported by the base; and

(iii) at least one second elongated member supported by a respective one of the first elongated members for sliding motion along the extension axis between at least an extended position and a retracted position;

a load compensator supported by the leg assembly, the load compensator including a spring that generates a variable spring force that depends at least in part on a degree of a spring loading, the spring having first and second ends at opposite ends of a length dimension of the spring, the first end of the spring operatively coupled to the second elongated member;

a table top supported by the at least one second member such that the table top can be supported at varying elevations above the at least one base; and

a locking assembly including;

(i) a lock housing supported by the leg assembly substantially stationary with respect to the table top member so that the lock housing moves with the table top as the second elongated member moves between the extended and retracted positions, the lock housing forming a lock housing passageway that passes through the lock housing;

(ii) a first coupler supported by the leg assembly and including at least an elongated central portion that extends through the lock housing passageway; and

(iii) a locking member mounted within the lock housing proximate the lock housing passageway and moveable between a locked position wherein the locking member is operably linked to the first coupler to restrict movement of the first coupler relative to the lock housing and an unlocked position wherein the locking member is de-linked from the first coupler to allow movement of the first coupler relative to the lock housing and through the lock housing passageway, wherein the first elongated member forms an internal passageway and wherein the second elongated member is received at least in part in the first internal passageway, a top end of the second elongated member extending out the top of the first internal passageway.

55. The table assembly of claim 54 wherein the housing passageway is substantially parallel to the length dimension of the spring.

56. The table assembly of claim 54 wherein the elongated central portion of the first coupler is substantially parallel to the length dimension of the spring.

57. The table assembly of claim 54 wherein the locking member is biased toward the locked position.

58. The table assembly of claim 57 wherein the locking member is a lever, the assembly further including a lock spring that biases the lever into the locked position.

59. The table assembly of claim 54 wherein the first coupler includes a threaded shaft member.

60. A table assembly comprising:

at least one leg assembly including;

(i) at least one base;

(ii) at least one first elongated member having a length dimension parallel to a substantially vertical extension axis, the first elongated member being supported by the base; and

(iii) at least one second elongated member supported by a respective one of the first elongated members for sliding motion along the extension axis between at least an extended position and a retracted position;

a load compensator supported by the leg assembly, the load compensator including a spring that generates a variable spring force that depends at least in part on a degree of a spring loading, the spring having first and second ends at opposite ends of a length dimension of the spring, the first end of the spring operatively coupled to the second elongated member;

a table top supported by the at least one second member such that the table top can be supported at varying elevations above the at least one base; and

a locking assembly including;

(i) a lock housing supported by the leg assembly substantially stationary with respect to the table top member so that the lock housing moves with the table top as the second elongated member moves between the extended and retracted positions, the lock housing forming a lock housing passageway that passes through the lock housing;

(ii) a first coupler supported by the leg assembly and including at least an elongated central portion that extends through the lock housing passageway; and

(iii) a locking member mounted within the lock housing proximate the lock housing passageway and moveable between a locked position wherein the locking member is operably linked to the first coupler to restrict movement of the first coupler relative to the lock housing and an unlocked position wherein the locking member is de-linked from the first coupler to allow movement of the first coupler relative to the lock housing and through the lock housing passageway, wherein the first elongated member forms a first internal passageway and wherein the second elongated member is received at least in part in the first internal passageway when the second elongated member is in each of the extended and retracted positions.

61. The table assembly of claim 60 wherein the housing passageway is substantially parallel to the length dimension of the spring.

62. The table assembly of claim 60 wherein the elongated central portion of the first coupler is substantially parallel to the length dimension of the spring.

63. The table assembly of claim 60 wherein the locking member is biased toward the locked position.

64. The table assembly of claim 63 wherein the locking member is a lever, the assembly further including a lock spring that biases the lever into the locked position.

65. The table assembly of claim 60 wherein the first coupler includes a threaded shaft member.