Screwdriver with teethed head
First Claim
Patent Images
1. A screwdriver with a teethed head portion comprising:
- a cruciform head including four sheets which are arranged as a cruciform shape;
two sides of each sheet having respective wavelike teeth portions for increasing a contact area between the screwdriver and a screwed object;
each tooth in the teeth portion being arranged approximately along an axial direction of the head for driving a screw means.
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Abstract
A screwdriver with teethed head portion comprises a cruciform head including four sheets which are arranged as a cruciform shape. Two sides of each sheet have respective wavelike teeth portions for increasing a contact area between the screwdriver and a screwed object. Each tooth in the teeth portion is arranged approximately along an axial direction of the head for driving a screw means. The screwdriver head has a great contact area with a screwing means so that they are engaged tightly. As a result the screwing means will not worn and the work can be performed efficiently.
7 Citations
2 Claims
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1. A screwdriver with a teethed head portion comprising:
a cruciform head including four sheets which are arranged as a cruciform shape;
two sides of each sheet having respective wavelike teeth portions for increasing a contact area between the screwdriver and a screwed object;
each tooth in the teeth portion being arranged approximately along an axial direction of the head for driving a screw means.
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2. A screwdriver with a teethed head portion comprising:
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a held portion at one end of the screw driver;
a rod body inserted into a front end of the held portion;
a front end of the rod body being formed with a cruciform head;
the head including four sheets which are arranged as a cruciform shape;
two sides of each sheet having respective wavelike teeth portions for increasing a contact area between the screw driver and a screwed object;
each tooth in the teeth portion being arranged approximately along an axial direction of the head for driving a screw means.
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Specification
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Current AssigneeChang-Ying Chen
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Original AssigneeChang-Ying Chen
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InventorsChen, Chang-Ying
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Application NumberUS10/999,062Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current81/460CPC Class CodesB25B 15/005 with cross- or star-shaped ...
