Power floor method and assembly

• US 7,928,602 B2
• Filed: 03/30/2007
• Issued: 04/19/2011
• Est. Priority Date: 03/30/2007
• Status: Active Grant

• Current Assignee: Steelcase Development Corporation (Steelcase Incorporated)
• Original Assignee: Steelcase Development Corporation (Steelcase Incorporated)
• Inventors: Heidmann, Kurt
• Primary Examiner(s): PALADINI, ALBERT WILLIAM
• Application Number:
  US11/731,477
• Publication Number:
  US 20080238216A1
• Time in Patent Office: 1,481 Days
• Field of Search: 307/42, 713/320, 522/201, 522/208
• US Class Current: 307/42
• CPC Class Codes: E04F 15/02 Flooring or floor layers composed of a number of similar elements of webs E04F15/16
• CPC Class Codes: H02J 1/00 Circuit arrangements for dc mains or dc distribution networks

Abstract

A power floor tile assembly and method for providing power to furniture components via a floor structure, the tile assembly including a plurality of floor tiles, each tile including a substantially rigid supporting substrate member that includes top and bottom surfaces and an edge, at least a first conductive tile contact supported by the substrate member and extending to an exposed end and a covering layer having top and bottom surfaces and a thickness dimension between the top and bottom surfaces, the covering layer forming a separate opening for each of the tile contacts, the openings aligned with the tile contacts so that each tile contact extends through a separate one of the openings, the covering layer having a thickness dimension between the top and bottom surfaces such that the exposed end of each tile contact protrudes past the top surface of the covering layer, wherein each supporting substrate and associated covering layer are shaped such that the tile can be arranged with other tiles in side by side fashion to provide a substantially contiguous floor structure.

Claims

1. A floor tile assembly comprising:

a plurality of floor tiles, each tile including;

a substantially rigid supporting substrate member that includes top and bottom surfaces and an edge;

at least a first conductive tile contact supported by the substrate member and extending to an exposed end; and

a covering layer having top and bottom surfaces and a thickness dimension between the top and bottom surfaces, the covering layer forming a separate opening for each of the tile contacts, the openings aligned with the tile contacts so that each tile contact extends through a separate one of the openings, the covering layer having a thickness dimension between the top and bottom surfaces such that the exposed end of each tile contact protrudes past the top surface of the covering layer;

wherein each supporting substrate and associated covering layer are shaped such that the tile can be arranged with other tiles in side by side fashion to provide a substantially contiguous floor structure.

2. The assembly of claim 1 including a plurality of conductive tile contacts.

3. The assembly of claim 1 further including electrically conductive members that extend from the edge of the substrate to each of the tile contacts.

4. The assembly of claim 1 further including a separate switching device linked to each of at least a subset of the tile contacts, each switching device for selectively linking and de-linking an associated contact to a power supply.

5. The assembly of claim 1 wherein each of the supporting substrate members and associated covering layers is substantially rectilinear.

6. The assembly of claim 1 wherein at least one of the top and bottom surfaces of the supporting substrate member forms channels from the edge of the substrate to locations adjacent the openings formed by the covering layer and wherein conductive members are received within the channels and extend from the edge of the substrate to the locations adjacent each of the openings.

7. The assembly of claim 6 wherein each conductive member is substantially flat and ribbon shaped and wherein, when a conductive member is received in one of the channels, an outward facing surface of the conductive member is substantially coplanar with the top surface of the supporting substrate member.

8. The assembly of claim 3 further including switching devices, a power supply and a ground linkage, the switching devices positioned between the power supply and a first subset of the conductive members for selectively linking separate ones of the conductive members in the first subset to the power supply, the ground linkage linking a second subset of the conductive members to ground.

9. The assembly of claim 8 wherein the tile contacts that are mounted to the conductive members in the first subset of conductive members include a first subset of tile contacts, the assembly further including a controller linked to the first subset of tile contacts, the assembly for use with an object to be powered that includes at least first and second electrical moveable contacts for contacting and receiving power from a pair of the tile contacts that protrude from the covering layer, the controller sensing when one of the first and second moveable contacts contacts one of the tile contacts in the first set and controlling at least one of the switching devices to provide power to the contacted moveable contact.

10. The assembly of claim 9 wherein each switching device includes a resistor in parallel with a normally open switch where the power supply is normally linked to each of the tile contacts through the resistor and wherein, when one of the moveable contacts contacts one of the tile contacts in the first subset of tile contacts, the controller closes the normally open switch to bypass the resistor and link the power source to the contacted tile contact.

11. The assembly of claim 1 wherein each exposed contact end has a surface area of less than one square inch.

12. The assembly of claim 11 wherein each exposed contact end is at least one inch away from the closest adjacent exposed contact end.

13. The assembly of claim 1 wherein each exposed contact end has a surface area of less than one quarter of an inch.

14. The assembly of claim 1 wherein the covering layer includes at least one of carpet, wood and tile.

15. The assembly of claim 1 wherein each of the exposed ends of the tile contacts forms a curved surface.

16. The assembly of claim 1 wherein each of the tile contacts is one of a nodule where the exposed surface is semi-spherical and an elongated member wherein each of the exposed surfaces is substantially longer than it is wide.

17. The assembly of claim 1 wherein the openings formed by the covering layer are substantially equi-spaced along the top surface of the covering layer.

18. The assembly of claim 1 including between four and sixteen tile contacts that protrude past the covering layer.

19. The assembly of claim 1 including at least nine tile contacts.

20. The assembly of claim 1 wherein the exposed end protrudes past the top surface of the cover layer by more than 1/32^nd of a inch.

21. The assembly of claim 9 wherein the object to be powered includes a furniture component.

22. The assembly of claim 21 wherein the furniture component includes one of a desk, a table, a chair, a lap, a shelving unit, a partition system, a privacy panel, a cart, and an easel.

23. The assembly of claim 1 for use with an object to be powered where the object to be powered includes at least a pair of moveable contacts for linkage to at least a pair of the tile contacts, the assembly further including a controller for sensing when at least one of the moveable contacts contacts one of the tile contacts and for linking the contacting moveable contact through the at least one contacted tile contact to the power source to provide power to the moveable contact.

24. The assembly of claim 23 wherein the pair of moveable contacts includes a positive moveable contact and a negative moveable contact, the controller further sensing when the positive and negative moveable contacts contact two of the tile contacts, determining the polarities of the moveable contacts and linking the positive and negative moveable contacts to the power source and ground, respectively.

25. The assembly of claim 23 wherein at least a subset of the tile contacts that protrude from the covering layer are grounded and wherein the grounded tile contacts and ungrounded tile contacts are arranged such that whenever the object to be powered is supported by the floor assembly, at least first and second moveable contacts contact grounded and ungrounded tile contacts, respectively.

26. The assembly of claim 25 wherein the power source is linked to each of the ungrounded tile contacts to provide a low sensing current and wherein, when a moveable contact contacts one of the ungrounded tile contacts, the power source provides high power current to the contacting moveable contact.

27. The assembly of claim 23 wherein the tile contacts are arranged and dimensioned such that, when the object to be powered is supported by the floor assembly, at least a pair of the moveable contacts on the object to be powered contact at least a pair of the tile contacts irrespective of the location of the object to be powered on the floor assembly.

28. The assembly of claim 23 wherein multiple objects to be powered may be supported by the floor assembly simultaneously and wherein the controller links at least one moveable contact of each of the supported objects to be powered to the power supply simultaneously.

29. The assembly of claim 1 wherein at least a subset of the tiles are arranged so that edges of the supporting substrates form an aligned edge line, the assembly further including an elongated conductive power bus bar that extends along the aligned edge line of the supporting substrates to provide power to the tile contacts.

30. The assembly of claim 29 wherein each of the tiles further includes a separate conductive member for each of the tile contacts and wherein each of the conductive members is supported by the supporting substrate and extends from the edge of the substrate adjacent the power bus bar to an associated tile contact.

31. The assembly of claim 30 further including a separate switching device for each of at least a subset of the conductive members for selectively linking the associated conductive member to a power supply.

32. The assembly of claim 31 wherein the switching devices are supported by the power bus bar.

33. The assembly of claim 31 wherein each switching device is supported by the tile that supports an associated conductive member.

34. The assembly of claim 29 further including an elongated conductive ground bar that extends along the supporting substrates to provide a ground connection to at least a subset of the tile contacts.

35. The assembly of claim 1 wherein the substrate includes oppositely facing first and second edges and forms channels that extend from the first edge to the second edge for receiving at least one power bus bar and at least one ground bus bar.

36. The assembly of claim 1 wherein each of the tile contacts is resiliently biased into the position where the exposed end protrudes past the top surface of the covering member and wherein, when downward force is applied to the exposed surface, the contact at least partially moves into an associated covering layer opening.

37. The assembly of claim 1 further including a separate first coupler for each of the tile contacts that is mounted to the supporting substrate and wherein each of the tile contacts includes a second coupler for coupling with one of the first couplers such that each tile contact is releasably couplable to the substrate.

38. A furniture power delivery system comprising:

a floor subassembly including;

a covering layer forming a top surface for supporting furniture components;

a plurality of electrically conductive floor contacts that extend through the covering layer and that include exposed ends that protrude past the top surface of the covering layer, the floor contacts arranged so that at least one of the floor contacts is adjacent and make contact with one of the moveable contacts irrespective of the location of the furniture component on the floor subassembly;

a power supply;

a plurality of switching devices normally linking the power supply to an associated floor contact to provide a low signaling current to the associated floor contact; and

a controller for controlling the switching devices; and

a furniture component to be powered including more than one electrically conductive downwardly facing moveable contact;

wherein the floor contacts are dimensioned and arranged and the moveable contacts are dimensioned and arranged such that at least two of the moveable contacts contact at least two of the floor contacts when the furniture component is supported by the floor subassembly irrespective of the location of the furniture component on the floor subassembly.

39. The system of claim 38 wherein the furniture component further includes a signal circuit and wherein, when one of the moveable contacts of the furniture component contacts one of the floor contacts, the signal circuit draws the low signal current in a manner that is recognizable as an indication that a moveable contact of a furniture component is contacting the floor contact, the controller sensing the current drawn by the signal circuit, recognizing the power drawn as indicating a furniture component and increasing the current to the contacting floor contact and contacting moveable contact.

40. The system of claim 39 wherein the low signal current is less than 10 milliamps and where the current level is increased to more than 3 amps.

41. The system of claim 39 wherein the low signal current is less than 4 milliamps and where the current level is increased to more than 5 amps.

42. The system of claim 39 further including a plurality of ground contacts that extend through the covering layer and that include exposed ends that protrude past the top surface of the covering layer, the ground contacts arranged so that at least one of the floor contacts is adjacent and makes contact with one of the ground contacts irrespective of the location of the furniture component on the floor subassembly.

43. The system of claim 42 wherein each floor contact is separated from an adjacent floor contact by a ground contact.

44. A method for providing power to an object to be powered, the method comprising the steps of:

providing a first electrical moveable contact and a signal circuit on the object to be powered;

providing a floor assembly that includes a plurality of electrical floor contacts and a power source;

when the first electrical moveable contact contacts a first of the floor contacts in the first subset, providing a low signal current through the first contact and the first electrical moveable contact to the signal circuit where the signal current is sufficient to drive the signal circuit;

upon receiving the signal current, the signal circuit drawing the low signal current according to a pattern;

sensing the current draw pattern at the floor contact through which the current is drawn;

recognizing the current draw pattern as indicative of an object to be powered; and

increasing the current provided to the first of the floor contacts to a powering level sufficient to power the object.

45. The method of claim 44 wherein the step of providing a floor assembly includes providing a ground linkage that links a second subset of the floor contacts to ground.

46. The method of claim 45 wherein the step of providing a floor assembly further includes providing an assembly where the floor contacts are substantially equi-spaced along a top surface of the floor assembly and wherein distal ends of the floor contacts are exposed and protrude above the top surface of the floor assembly.

47. The method of claim 44 wherein the low signal current is less than 10 milliamps.

48. The method of claim 44 wherein the low signal current is substantially 3 milliamps.