Patents Assigned to Addway Engineering Limited
  • Electric toothbrush
    Patent number: 6453498
    Abstract: An electric toothbrush has a housing incorporating a motor with a drive shaft rotatable about a longitudinal axis A. A shank extends beyond the housing and is integrally formed with a brush head at its remote end. The shank is pivotably supported intermediate its length in an end wall of the housing. An eccentric cam mounted to the shaft cooperates with a cup on a near end of the shank to form a mechanical coupling. When the shaft rotates both the near end and the brush head moves through a circular path.
    Type: Grant
    Filed: July 26, 2000
    Date of Patent: September 24, 2002
    Assignee: Addway Engineering Limited
    Inventor: Ka Shing Wu
  • Toothbrush with water jet
    Patent number: 6047429
    Abstract: An electric toothbrush includes a drive shaft that is reciprocated by a motor in a brush handle (not shown). The reciprocating movement is directly transferred to a piston that serves to pump water from a reservoir via a water passage to a water jet nozzle in the midst of brushes.
    Type: Grant
    Filed: October 9, 1998
    Date of Patent: April 11, 2000
    Assignee: Addway Engineering Limited
    Inventor: Ka Shing Wu
  • Dental flosser
    Patent number: 5931170
    Abstract: A dental flosser has a bushing with a lateral pin that engages in a spiral groove in a sleeve that surrounds the bushing. The bushing is driven backwards and forwards by a shaft and this causes a flosser element base anchor to be rotated clockwise and counterclockwise, and moved backwards and forwards at the same time during use.
    Type: Grant
    Filed: October 8, 1998
    Date of Patent: August 3, 1999
    Assignee: Addway Engineering Limited
    Inventor: Ka Shing Wu
  • Electric toothbrushes
    Patent number: 5784743
    Abstract: An electric toothbrush has a drive shaft with an off-set finger. A pivotably supported wobble plate has a fork at one end and an arcuate drive gear at another end. The drive gear meshes with a gear rotatably fixed to a brush holder so that in use the brush holder is caused to oscillate. The arrangement provides more flexibility in design and in particular enables the maximum arc of oscillation to be significantly increased over similar prior art toothbrushes.
    Type: Grant
    Filed: December 30, 1996
    Date of Patent: July 28, 1998
    Assignee: Addway Engineering Limited
    Inventor: Kwok Nam Shek
  • Mechanically driven toothbrush
    Patent number: 5778474
    Abstract: A toothbrush has a thin, metal cam shaft rotatably driven about a central longitudinal axis. Tuft blocks are mounted in a head member and constrained to pivot about an axis of a support shaft. Upper sides of the tuft blocks each have a slot which fits somewhat loosely over the cam shaft. During use, the cam shaft causes upstanding ends of bristles to move from side to side.
    Type: Grant
    Filed: November 14, 1996
    Date of Patent: July 14, 1998
    Assignee: Addway Engineering Limited
    Inventor: Kwok-Nam Shek
  • Electric toothbrushes
    Patent number: 5732432
    Abstract: An electric toothbrush has an elongate shank and a drive shaft formed in two sections. The sections are drivingly coupled together by a coil spring. The shank is formed in two sections joined together by a flexible ribbed seal. The shank is able to flex while the drive shaft continues to run normally without adding strain to the electric motor which would increase electric power required. Rigid bars restrict the flexibility of the shank parts into a single plane.
    Type: Grant
    Filed: November 20, 1996
    Date of Patent: March 31, 1998
    Assignee: Addway Engineering Limited
    Inventor: Fung Kut Hui