Fiber reinforced resin screw
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsAkira Ikada, Naohiro Horie
Life of this patent
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Abstract
The present invention is relates to a fiber reinforced resin screw 10, 20 shaped using a resin composition containing reinforcing fiber in a resin. A pitch of threads has a length of 1.5 to 2 times of a standard pitch corresponding to an outer diameter of the threads prescribed in standards of a metric coarse screw, a unified coarse screw and a unified fine screw. An average fiber length of the reinforcing fiber is 1 to 1/3 times of the pitch of the threads in the fiber reinforced resin screw. A content rate of the reinforcing fiber is in a range of 20 to 80%. In this way, the fiber reinforced resin screw to have improved is provided in the strength of the thread.
Claims5
A fiber reinforced resin screw formed from a resin composition containing reinforcing fibers in a resin,
- wherein a pitch of a thread of the fiber reinforced resin screw has a length of 1/4.3 to 1/2.2 times of an outer diameter of the thread,
- wherein an average fiber length of the reinforcing fibers is 1 to 1/3 times of the pitch,
- wherein a content rate of the reinforcing fibers is in a range of 20 to 80%,
- wherein the reinforcing fibers contained in the resin composition are orientated along a top surface of the thread or side surfaces of the thread, and
- wherein a ratio of the average fiber length of the reinforcing fibers to the outer diameter of the thread ranges from 1/12.9 to 1/2.2.
Dependencies are inferred from the claim text.