Patents Assigned to The Jacobs Manufacturing Co., Ltd.
  • Keys for drill chucks
    Patent number: 4186933
    Abstract: A key for a drill chuck, the key including a geared head part connected to a separately formed handle part of machined, forged, cast or moulded form.
    Type: Grant
    Filed: July 12, 1978
    Date of Patent: February 5, 1980
    Assignee: The Jacobs Manufacturing Co., Ltd.
    Inventor: George C. Derbyshire
  • Hand tools
    Patent number: 3935889
    Abstract: A hand tool including a blade or tool part with a connected tang and a handle part with an aperture extending axially from one end for receiving the tang, a locking pin extending diametrically across the handle part and the tang being provided with a slot for the passage of said locking pin to a cross bore in the tang, the locking pin being rotatable or axially moveable to engage it with said cross bore.
    Type: Grant
    Filed: November 21, 1974
    Date of Patent: February 3, 1976
    Assignee: The Jacobs Manufacturing Co., Ltd.
    Inventor: George Cecil Derbyshire
  • Drill chuck and method of assembly
    Patent number: 3934891
    Abstract: A drill chuck having a rotatable nut member for advancing and retracting converging jaws, and provided with passages for feeding lubricant to the groove in which the nut is rotatable. And a method of assembling the components of the chuck in dry condition and subsequently feeding lubricant through the passages to the groove in which the nut is rotatably mounted.
    Type: Grant
    Filed: April 9, 1974
    Date of Patent: January 27, 1976
    Assignee: The Jacobs Manufacturing Co., Ltd.
    Inventor: George C. Derbyshire
  • Drill chuck
    Patent number: D259855
    Type: Grant
    Filed: August 17, 1978
    Date of Patent: July 14, 1981
    Assignee: The Jacobs Manufacturing Co., Ltd.
    Inventor: George C. Derbyshire