Screwdriver with an impact device

Details Screwdriver with an impact device Screwdriver with an impact device

1999-12-29

2001-06-26

Eley, Timothy V. (Department: 3723)

Tools

Including tool driving by impact delivering component or...

C081S465000, C081S177400, C081S177600

Reexamination Certificate

active

06250187

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a screwdriver, and more particularly, to a screwdriver having an impact device which provides a sudden and large impact to an object so as to loosen or tighten the object.
BACKGROUND OF THE INVENTION
A conventional screwdriver generally includes a handle and a shank which has a functional end. The functional end is used to engage with an object such as a bolt or nut, so that when rotating the screwdriver, the object can be loosened or tightened. However, sometimes the object is rusted and is securely attached to the parts that are adjacent to the object. In other words, the bolt and the parts adjacent to the bolt are a one-piece member, the rust grasps the bolt securely and the screwdriver cannot provide a large enough force to the bolt to let the bolt separate from the parts. The operator generally hits the rust or the bolt to vibrate and separate the rust from the bolt so as to easily rotate the bolt. Accordingly, the operator needs a hammer to hit the handle of the screwdriver to let the rust be broken.
The present invention intends to provide a screwdriver that has an impact device comprising a spring and an impact rod so that the user pushes the shank against the object and compresses the spring so as to let the impact rod impact the bit of the screwdriver to shake the rust and/or the bolt. The screwdriver of the present invention is easily used and provides an effective shaking feature to loosen a bolt or a nut that is secured to rust.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a screwdriver comprising a handle having a chamber and a recess defined in two ends of the handle. An annular flange extends radially inward from an inside of the handle and is located between the recess and the chamber. A passage is defined through the annular flange and communicates with the recess and the chamber. A shank extends from an end of the handle. A block and a spring are respectively received in the chamber, and a cap seals the other end of the handle. An impact rod is movably received in the recess and a spring is mounted to the impact rod. A first end of the impact rod is sized to be inserted into the passage and a second end of the impact rod contacts the shank.
The object of the present invention is to provide a screwdriver that includes an impact device received therein so that the user may exert a sudden and large force to a rusted object to break the rust.
These and further objects, features and advantages of the present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, several embodiments in accordance with the present invention.


REFERENCES:
patent: 3435862 (1969-04-01), Rainey
patent: 4858504 (1989-08-01), Tsai
patent: 5012709 (1991-05-01), Su
patent: 5214987 (1993-06-01), Fenton, Sr.

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