Tools – Wrench – screwdriver – or driver therefor – Having work engaging and force exerting portion inserted...
Reexamination Certificate
2003-01-27
2003-12-23
Hail, III, Joseph J. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Having work engaging and force exerting portion inserted...
C081S451000, C279S155000, C279S904000
Reexamination Certificate
active
06666114
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a new and improved magnetic connecting tube for a screwdriver head, and more particularly, to an apparatus in which the repulsive force between two permanent magnets is utilized to drive out the screwdriver head. Meanwhile, the permanent magnet adjacent to the screwdriver head has the magnetic force to attract the screwdriver head such that the hexagonal head can be firmly attached and can't fall out of an engaging hole.
2. Description of the Prior Art
The screwing tools have been used for a long history. Their versions and structures are different according to the manufacturing factories and use surroundings. A conventional magnetic connecting tube, as illustrated in
FIG. 6
, for receiving hexagonal screwdriver head includes a main body
10
, a push element
11
, a spring element
12
, a fastening ring
13
and two engaging pearls
14
. The main body
10
has an engaging hole
15
at one end thereof for receiving a screwdriver head
16
and a compression spring
17
at the other end thereof. When the screwdriver head
16
is inserted into the engaging hole
15
, it presses against the compression spring
17
in compressed state. When the push element
11
is used to push the engaging balls
14
inwardly, the screwdriver head
16
will be driven out of the engaging hole
15
by means of the restoring force of the compression spring
17
.
Though the above-mentioned conventional structure can reach the expected effect of driving out the screwdriver head
16
, it also has the following application drawbacks:
1. The restoring force of the compression spring
17
has to meet certain requirements in order to smoothly drive out the screwdriver head
16
. Therefore, the screwdriver head
16
easily springs out of the engaging hole
15
. The user has to catch it with care. Otherwise, it is difficult for him to find the screwdriver head
16
again when he works in a disorderly small room or for highrise outdoor operation. Accordingly, the work must be seriously influenced.
2. The screwdriver head
16
has its own weight and structural strength. When it springs out or falls down to the ground and unfortunately hits persons around there, the consequence will be too terrible to imagine.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to eliminate the above-mentioned drawbacks and to provide a connecting tube for a screwdriver head in which the repulsive force between two permanent magnets is utilized to drive out the screwdriver head. Meanwhile, the permanent magnet adjacent to the screwdriver head has the magnetic force to attract the screwdriver head such that the hexagonal head can be firmly attached and can't fall out of an engaging hole. Therefore, the safety of persons around the operation site can be ensured. Moreover, a longer service life of the present invention can be maintained for thoroughly fulfilling the requirements of industries.
REFERENCES:
patent: 5996452 (1999-12-01), Chiang
patent: RE36797 (2000-08-01), Eggert et al.
patent: 6199872 (2001-03-01), Hasan
patent: 6325393 (2001-12-01), Chen et al.
patent: 6530299 (2003-03-01), Liu
Chiu Kuo-Hsiung
Hail III Joseph J.
Shakeri Hadi
Troxell Law Office PLLC.
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