Patents by Inventor Donald T. Chadwick

Donald T. Chadwick has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8480171
    Abstract: A chair having a seat rotatably attached to a tilt spring portion of a tilt mechanism such that the tilt spring is activated by movement of the seat. A backrest and/or the seat can be rotatably connected to the tilt mechanism by parallel arm arrangements which permit the seat and backrest to tilt relative to each other. A tilt limiter can have a magnetic member which facilitates full movement of the tilt limiter between free and locked positions, and which creates an audible indication of full movement of the tilt limiter. The seat/backrest can be made from a flexible mesh material secured to a rigid overmolding which surrounds and is attached to an inner frame of the seat/backrest wherein an outer surface of the overmolding forms an outer surface of the seat/backrest frame and attachment of the overmolding causes the inner frame to stretch the mesh to a final condition.
    Type: Grant
    Filed: July 8, 2005
    Date of Patent: July 9, 2013
    Assignee: Knoll, Inc.
    Inventors: Donald T. Chadwick, Arkady Golynsky, Robert A. Melhuish, Hendrik R. van Hekken, Ron K. Watson
  • Patent number: 7887131
    Abstract: A chair having a seat rotatably attached to a tilt spring portion of a tilt mechanism such that the tilt spring is activated by movement of the seat. A backrest and/or the seat can be rotatably connected to the tilt mechanism by parallel arm arrangements which permit the seat and backrest to tilt relative to each other. A tilt limiter can have a magnetic member which facilitates full movement of the tilt limiter between free and locked positions, and which creates an audible indication of full movement of the tilt limiter. The seat/backrest can be made from a flexible mesh material secured to a rigid overmolding which surrounds and is attached to an inner frame of the seat/backrest wherein an outer surface of the overmolding forms an outer surface of the seat/backrest frame and attachment of the overmolding causes the inner frame to stretch the mesh to a final condition.
    Type: Grant
    Filed: February 12, 2010
    Date of Patent: February 15, 2011
    Assignee: Knoll, Inc.
    Inventors: Donald T. Chadwick, Arkady Golynsky, Robert A. Melhuish, Hendrik R. van Hekken, Ron K. Watson
  • Publication number: 20100141000
    Abstract: A chair having a seat rotatably attached to a tilt spring portion of a tilt mechanism such that the tilt spring is activated by movement of the seat. A backrest and/or the seat can be rotatably connected to the tilt mechanism by parallel arm arrangements which permit the seat and backrest to tilt relative to each other. A tilt limiter can have a magnetic member which facilitates full movement of the tilt limiter between free and locked positions, and which creates an audible indication of full movement of the tilt limiter. The seat/backrest can be made from a flexible mesh material secured to a rigid overmolding which surrounds and is attached to an inner frame of the seat/backrest wherein an outer surface of the overmolding forms an outer surface of the seat/backrest frame and attachment of the overmolding causes the inner frame to stretch the mesh to a final condition.
    Type: Application
    Filed: February 12, 2010
    Publication date: June 10, 2010
    Applicant: Knoll, Inc.
    Inventors: Donald T. Chadwick, Arkady Golynsky, Robert A. Melhuish, Hendrik R. van Hekken, Ron K. Watson
  • Patent number: 6019338
    Abstract: The angle of a desktop terminal such as a telephone can be easily adjusted with the combination of a stand and a tilt unit control device integrated within a lower surface of the terminal. The terminal is pivotally connected to the stand. The terminal is held at a particular angle by engagement of a tooth on the tilt unit control device, with a serration on a rear surface of the tilt unit of the stand. To change the angle of the terminal, the user depresses a handle of the tilt unit control device which pivots the tooth of the device away from the tilt unit thereby disengaging the tooth from the serration on the tilt unit. The user then pivots the terminal to the preferred angle and depresses the handle, thereby engaging the tooth with a different serration on the tilt unit.
    Type: Grant
    Filed: February 23, 1998
    Date of Patent: February 1, 2000
    Assignee: Nortel Networks Corporation
    Inventors: Michael Brown, Ernest R. Dynie, John I. Johnson, Donald T. Chadwick
  • Patent number: 4889385
    Abstract: A chair comprises an elongated one-piece seat-and-back support bent so as to form a lower substantially U-shaped seat support and an upper substantially upright back support. The seat support includes lower and upper leg portions and a bight portion intermediate the same. The bight portion is resilient thereby enabling the upper leg portion to deflect downwardly relative to the lower leg portion, and the back support to move downwardly and rearwardly, in response to a downward force exerted on the upper leg portion. In addition, the chair comprises a stabilizer mounted between the upper and lower leg portions of the seat support and for providing stability to the same during downward relative deflection of the upper leg portion. The chair further comprises resilient stiffening member and a tension control mechanism. The stiffening member is mounted to and between the seat support upper and lower leg portions and functions to increase resistance to relative deflection of the upper leg portion.
    Type: Grant
    Filed: March 9, 1988
    Date of Patent: December 26, 1989
    Assignee: American Seating Company
    Inventors: Donald T. Chadwick, Peter R. Glass
  • Patent number: 4718716
    Abstract: A reclining chair (10) having a seat (12), backrest (14), side supports (16) and a reclining mechanism which includes a backrest bracket (34) rigidly affixed to the backrest (14) and pivotably mounted to a side support bracket (18), the side support bracket (18) being rigidly affixed to a side support (16). A seat support bracket (30) is rigidly affixed to the seat (12) and pivotably mounted to a side support bracket (18). A coupler link (40) has one end pivotably connected to the backrest bracket (34) and a second end pivotably connected to the seat support bracket (30). The axis of rotation of the backrest (14) is located so as to pass approximately through the hips of a chair occupant. Further, the linkages are so selected and arranged that the reclining motion and return motion take place by a horizontal translation of the center of gravity of the occupant to minimize the effort required to operate the reclining mechanism through its range of movement.
    Type: Grant
    Filed: December 3, 1986
    Date of Patent: January 12, 1988
    Assignee: Herman Miller, Inc.
    Inventors: William E. Stumpf, Donald T. Chadwick, Bruce R. Gezon
  • Patent number: 4533791
    Abstract: In a mounting arrangement of lamellar, input/output devices for a computer or telecommunications terminal, one of the devices is movable relative to another of the devices between a limited operational position in which a first input/output device is operably exposed but masks a second device, and a fully operational position in which both the first and second devices are operably exposed. One embodiment has one input/output device sliding relative to a vertically adjacent input/output device. In another embodiment, input/output devices are hinged relative to each other and to a common cabinet base. The mounting arrangements offer the advantages of spatial economy, input/output device protection, and the capacity for an aesthetically attractive cabinet.
    Type: Grant
    Filed: February 5, 1982
    Date of Patent: August 6, 1985
    Assignee: Northern Telecom Limited
    Inventors: Clifford D. Read, William D. Sawyer, Donald T. Chadwick
  • Patent number: 4529247
    Abstract: A one-piece shell chair (10) includes an unitary integrally formed shell body (12) having a flexurally supported seat pan (14) and a flexurally supported backrest (16) defined in part by an H-shaped opening (20) in the shell body. The backrest (16) and the seat pan (14) resiliently flex as independent units in response to an occupant's body shape, size, posture and positioning. Integral, flexible straps join the backrest (16) to the seat pan (14) to permit resilient flexing of the backrest (16) with respect to the seat pan (14) about an axis through the occupant's hip joint to minimize shear between the backrest and the occupant's back during flexing movement of the backrest 16 with respect to the seat pan 14. The seat (12) is mounted to a tilt mechanism (28) which pivots the seat (12) about an axis forward and below the front edge (14a) of the seat pan (14) enabling the user's feet to remain stationary on the floor.
    Type: Grant
    Filed: April 15, 1982
    Date of Patent: July 16, 1985
    Assignee: Herman Miller, Inc.
    Inventors: William E. Stumpf, Donald T. Chadwick
  • Patent number: D471024
    Type: Grant
    Filed: April 17, 2002
    Date of Patent: March 4, 2003
    Assignee: Knoll, Inc.
    Inventors: Donald T. Chadwick, Francisco Romero
  • Patent number: D475544
    Type: Grant
    Filed: March 19, 2002
    Date of Patent: June 10, 2003
    Assignee: Knoll, Inc.
    Inventors: Donald T. Chadwick, Francisco Romero
  • Patent number: D289120
    Type: Grant
    Filed: February 17, 1984
    Date of Patent: April 7, 1987
    Assignee: Herman Miller, Inc.
    Inventors: Donald T. Chadwick, William E. Stumpf
  • Patent number: D295347
    Type: Grant
    Filed: December 31, 1986
    Date of Patent: April 26, 1988
    Assignee: Herman Miller, Inc.
    Inventors: Donald T. Chadwick, William E. Stumpf
  • Patent number: D296394
    Type: Grant
    Filed: December 31, 1986
    Date of Patent: June 28, 1988
    Assignee: Herman Miller, Inc.
    Inventors: Donald T. Chadwick, William E. Stumpf
  • Patent number: D296623
    Type: Grant
    Filed: December 31, 1986
    Date of Patent: July 12, 1988
    Assignee: Herman Miller, Inc.
    Inventors: Donald T. Chadwick, William E. Stumpf
  • Patent number: D299192
    Type: Grant
    Filed: December 31, 1986
    Date of Patent: January 3, 1989
    Assignee: Herman Miller, Inc.
    Inventors: Donald T. Chadwick, William E. Stumpf
  • Patent number: D318577
    Type: Grant
    Filed: March 11, 1988
    Date of Patent: July 30, 1991
    Assignee: American Seating Company
    Inventors: Donald T. Chadwick, Peter R. Glass
  • Patent number: D606771
    Type: Grant
    Filed: May 6, 2009
    Date of Patent: December 29, 2009
    Assignee: Knoll, Inc.
    Inventor: Donald T. Chadwick
  • Patent number: D607661
    Type: Grant
    Filed: May 6, 2009
    Date of Patent: January 12, 2010
    Assignee: Knoll, Inc.
    Inventor: Donald T. Chadwick
  • Patent number: D344649
    Type: Grant
    Filed: March 17, 1992
    Date of Patent: March 1, 1994
    Assignee: American Seating Company
    Inventors: Jeffrey S. Wilcox, Keith A. McDowell, Donald T. Chadwick, Peter F. Bemis
  • Patent number: D346282
    Type: Grant
    Filed: March 17, 1992
    Date of Patent: April 26, 1994
    Assignee: American Seating Company
    Inventors: Jeffrey S. Wilcox, Keith A. McDowell, Donald T. Chadwick, Peter F. Bemis