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Chair with electrically adjustable components

DC
  • US 8,201,877 B2
  • Filed: 02/14/2010
  • Issued: 06/19/2012
  • Est. Priority Date: 02/14/2010
  • Status: Expired due to Fees
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Associated Case
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Associated Defendant
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Product Citations
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Petitions
9
Forward Citations
5
Assignments
First Claim
Patent Images

1. A chair comprising:

  • a seat (14);

    two arms (12);

    a back (13);

    a foot rest (11);

    a seat and backrest frame (37) fixedly mounted to the seat (14) and the back (13);

    a control unit (2) mounted on either arm (12) and comprising an extending operation button (22), a retracting operation button (23), an indicator (25), an on/off switch (24), and a printed circuit board (PCB) (28) electrically connected to a direct current (DC) power source (A), the on/off switch (24), the indicator (25), the extending operation button (22), and the retracting operation buttons (23);

    a reciprocating unit (3) mounted under the seat (14) and comprising a base (30), a DC motor (31) mounted on the base (30) and electrically connected to the DC power source (A), a lead screw (32) having one end rotatably attached to the DC motor (31), a limit member (34) mounted on the base (3) and aligned with the DC motor (31), a screw-type slide (33) threadedly put on the lead screw (32) and adapted to move between the limit member (34) at one end of the lead screw (32) and the DC motor (31) at the other end of the lead screw (32), two parallel first link members (35) each having one end attached to one side of the screw-type slide (33), a transverse rod (T) pivotably passing the other ends of the first link members (35), and two second link members (36) each having one end pivotably connected to either end of the transverse rod (T); and

    two foot, seat, and back adjustment units (4) disposed in the arms (12) respectively, each of the foot, seat, and back adjustment units (4) comprising a bent first link (41) having one end pivotably connected to the other end of the second link member (36), a second link (42) pivotably connected to the other end of the first link (41), a third link (44) pivotably connected to one end of the second link (42) and the other end connected to the seat and backrest frame (37), a bent fourth link (43) having a substantial portion parallel to the second link (42) and having one end pivotably connected to one end of the third link (44), a fifth link (45) pivotably connected to the bent portion of the fourth link (43) and having one end pivotably connected to the other end of the second link (42), a sixth link (46) parallel to the fifth link (45) and having one end pivotably connected to the other end of the fourth link (43), and a seventh link (47) pivotably connected to the other end of the sixth link (46) and having one end pivotably connected to the other end of the fifth link (45), either end of the foot rest (11) being mounted on the seventh link (47),whereby pressing the on/off switch (24) and pressing the extending operation button (22) will clockwise turn the DC motor (31), move the screw-type slide (33) toward the DC motor (31) along the lead screw (32), extend the components (41, 42, 43, 44, 45, 46, 47) of the foot, seat, and back adjustment units (4) via the pivotal connections of the first link members (35), the transverse rod (T), and the second link members (36), tilt the seat and backrest frame (37) from its predetermined position, and extend the foot rest (11); and

    whereby pressing the retracting operation button (23) will counterclockwise turn the DC motor (31), move the screw-type slide (33) toward the limit member (34) along the lead screw (32), retract the components (41, 42, 43, 44, 45, 46, 47) of the foot, seat, and back adjustment units (4) via the pivotal connections of the first link members (35), the transverse rod (T), and the second link members (36), retract the foot rest (11), and cause the seat and backrest frame (37) to return to its predetermined position.

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