Illumination – With implement or hand held holder therefor – Hand tool
Reexamination Certificate
2001-04-04
2002-11-12
Tso, Laura K. (Department: 2875)
Illumination
With implement or hand held holder therefor
Hand tool
C362S206000
Reexamination Certificate
active
06478442
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a screwdriver having a light emitting device and, more particularly, to a screwdriver capable of guiding light emitted by a light emitting device therein to the front end thereof, so that light can be focused in front of the tip of the screwdriver to clearly illuminate the screw to be turned.
BACKGROUND OF THE INVENTION
A screwdriver is a kind of tool for turning screws. As shown in
FIG. 1
, a conventional screwdriver comprises a handle
10
a
and a shank
11
a.
One end of the shank
11
a
is fixedly connected with the handle
10
a,
and the other end thereof forms a cabinet tip or a Philips head tip
12
a.
One can grip the handle
10
a
with hands to let the tip
12
a
at one end of the shank
11
a
match the slotted head or the Philips head of a screw so that he can use the handle
10
a
to turn the shank
11
a
and the tip
12
a
for screwing or unscrewing the screw.
However, when the conventional screwdriver is used to turn a screw situated at a dim site, it is difficult to quickly match the tip
12
a
with the slotted head or the Philips head of the screw. One must try many times before he can match the tip
12
a
with the slotted head or the Philips head of the screw, resulting in much inconvenience.
Therefore, many kinds of screwdrivers having light emitting effect have been proposed. For screwdrivers having light emitting effect in the prior art, the light emitting devices (light bulbs) are generally disposed in the handles thereof. When light emitted by the light emitting device shines the vicinity of the tip at the front end of the shank, light will become rather weak because of factors such as scattering. Therefore, the screw to be turned cannot be clearly illuminated. The present invention aims to resolve the above problems in the prior art.
SUMMARY OF THE INVENTION
The primary object of the present invention is to provide a screwdriver having a light emitting device, whereby when a light source of the light emitting device is turned on, light emitted by the light source can pass through the front end of a handle and be guided by a light guiding sleeve to the front end to be projected out so that light can be focused in front of a tip of the screwdriver to clearly illuminate the screw to be turned. Thereby, when the screwdriver is used to turn a screw at a dim site, one can quickly and exactly match the tip of the screwdriver with the slotted head or the Philips head of the screw.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing, in which:
REFERENCES:
patent: 2336136 (1943-12-01), Thomson et al.
patent: 4733337 (1988-03-01), Bieberstein
patent: 5628556 (1997-05-01), Hrabar et al.
patent: 5826969 (1998-10-01), Nevin
patent: 5980077 (1999-11-01), Shiao
patent: 6030092 (2000-02-01), McCalla et al.
patent: 6135608 (2000-10-01), Lin
patent: 6145995 (2000-11-01), Hung
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