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US 8,261,639 B2Granted
Screwdriver
AssigneeCrossman Corporartion
InventorJung-Chen Liao
Life of this patent
Estimating the term…
Abstract
A screwdriver comprises a shaft, and a handle core, a handle body and an outer layer formed on the shaft by injection molding. The multilayer structure of the screwdriver prevents the impact force from being transmitted to the user's hand and causing discomfort, and can relieve the discomfort caused by the impact force applied to the screwdriver while reducing the impact force loss during impact operation.
Claims9
A screwdriver comprising:
- a shaft with a driving head and an engaging portion at opposing ends thereof, and the engaging portion including a first section and a second section;
- a handle core including a fixing portion fixed at the first section of the shaft, an impact portion and a plurality of protrusions annularly located on an outer surface of the handle core, each two neighboring protrusions defining a recess therebetween;
- a handle body covering the second section of the shaft and the handle core and including an open end for exposing the impact portion of the handle core, a groove defined in an outer surface of the handle body, and a plurality of engaging recesses and engaging protrusions formed in an inner surface of the handle body for engaging with the protrusions and recesses of the handle core;
- and
- an outer layer disposed in the groove of the handle body.
2 more elements
Dependencies are inferred from the claim text.