Patents Assigned to Marshal Industrial Corporation
  • Patent number: 6638187
    Abstract: An improved racket frame without the need of drilling holes comprises two compound material pipe bodies. A plurality of U-shaped embedded tubes are uniformly clamped between the two pipe bodies with two openings of each of the U-shaped embedded tubes facing the same direction. A compound material layer sheathes the two pipe bodies and the U-shaped embedded tubes with only the two openings of each of the U-shaped embedded tubes being exposed. The compound material layer is then placed into a mold and blown and heated to form an integral racket frame structure having th rough holes. Meshes conventionally exposed out of the racket frame are hidden in the racket frame, hence reducing abrasion of the meshes, lengthening the lifetime of use of the meshes, and enhancing the delicacy. Because there is no need of drilling holes twice, the structure of the racket frame will not be damaged.
    Type: Grant
    Filed: December 9, 2002
    Date of Patent: October 28, 2003
    Assignee: Marshal Industrial Corporation
    Inventor: Ming Jen Tsai
  • Patent number: 6589125
    Abstract: The present invention provides a compound material frame body without the need of drilling holes. A plurality of symmetric embedded tubes are clamped between two compound material pipe bodies. An outmost compound material layer sheathes the compound material pipe bodies and the embedded tubes with two openings of each of the embedded tubes being exposed. An integrally formed compound material frame body having through holes can immediately be obtained by blowing and heating in a mold. Because there is no need of drilling holes, the structure of the frame body will not be damaged. Moreover, the present invention can achieve the effects of simple manufacturing process, short manufacturing time, and reduced cost.
    Type: Grant
    Filed: July 10, 2002
    Date of Patent: July 8, 2003
    Assignee: Marshal Industrial Corporation
    Inventor: Ming-Jen Tsai