Patents by Inventor David S. Chapin

David S. Chapin 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: 4751452
    Abstract: A portable power tool for forming wire wrap type connections includes an electric motor, a torque transmitter and a casing for enclosing the electric motor and the torque transmitter. Removably mounted to the casing is a battery pack. The battery pack mounts both rechargeable and non-rechargeable batteries so that the battery charger may not be recharged in a physically compatible battery pack when non-rechargeable batteries are contained within the battery pack.
    Type: Grant
    Filed: May 7, 1987
    Date of Patent: June 14, 1988
    Assignee: Cooper Industries
    Inventors: Paul R. Kilmer, David S. Chapin
  • Patent number: 4635363
    Abstract: A hand operated cutting tool, having a pair of blades pivotally connected together at a pivot point and having a handle joined to each blade, is provided. A relatively short handle on one of the blades extends upwardly and rearwardly from a line defined by the blade points and the pivot point. A ring is attached to a short handle to receive the thumb of the user. A relatively long handle is on the other blade and it extends upwardly and rearwardly. The long handle receives the user's fingers in a line substantially parallel to the line defined by the blade points and the pivot point.
    Type: Grant
    Filed: June 29, 1984
    Date of Patent: January 13, 1987
    Assignee: Cooper Industries, Inc.
    Inventor: David S. Chapin
  • Patent number: 4597453
    Abstract: A drive unit for a power tool has a motor driven output gear rotatable about an output axis, a rotatable carrier plate, and a plurality of idler gears rotatably mounted on pins affixed to the carrier plate such that the gears engage the periphery of the output gear. The unit includes a drive shaft supported at one end by the carrier plate, and a non-rotatable ring gear floatingly mounted for engagement with the idler gears, whereby rotation of the output gear is coupled to the drive shaft, and hence to the tool bit, through the carrier plate and the carrier plate is urged toward rotational alignment with the axis of the output gear through the action of rotational forces.
    Type: Grant
    Filed: February 8, 1985
    Date of Patent: July 1, 1986
    Assignee: Cooper Industries, Inc.
    Inventors: Paul R. Kilmer, David S. Chapin