Tools – Wrench – screwdriver – or driver therefor – Having work engaging and force exerting portion inserted...
Reexamination Certificate
2001-11-20
2003-03-11
Meislin, D. S. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Having work engaging and force exerting portion inserted...
C081S125000
Reexamination Certificate
active
06530299
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a joint adapter for a power drill screwdriver, and more particularly, to a joint adapter which can be used more easily and conveniently for a rapid exchange of the screw driver bits.
2. Description of the Prior Art
The joint adapter
10
for a (either electric or pneumatic) conventional power drill screw driver, as shown in
FIG. 5
, includes a driving shaft
12
with an insertion groove
11
, a locating socket
14
with female thread
13
, a washer
15
and an adjustable shell
17
with axial threaded internal hole
16
. The driving shaft
12
is provided with male thread
18
within a certain range on which the locating socket
14
and the adjustable shell
17
are screwed one after the other. The washer
15
is interposed between the locating socket
14
and the adjustable shell
17
for strengthening the fixing effect and for avoidance of unexpected loosening.
In using, after the insertion piece
19
of the driving shaft
12
is inserted into a corresponding insertion groove of the power drill screw driver (not shown), the locating socket
14
and the adjustable shell
17
are screwed in the direction of the screw driver bit
20
for a certain distance. Meanwhile, a strong magnet
22
at the front end of the axial threaded internal hole
16
of the adjustable shell
17
approaches the screw driver bit
20
in order to attract the screw
24
in a stable state. Accordingly, the high speed screwing can be smoothly performed.
However, the above-mentioned joint adapter
10
has the following drawbacks:
1. The locating socket
14
and the adjustable shell
17
have to be respectively screwed to the expected positions due to the arrangement of the washer
15
. Thus, the operational efficiency is greatly diminished.
2. As shown in
FIG. 6
, when the locating socket
14
and the adjustable shell
17
are screwed to the operation position of the screw
24
, the screwing portion between the adjustable shell
17
and the driving shaft
12
is gradually reduced so that the adjustable shell
17
shakes or can become detached from the locating socket
14
and the driving shaft
12
. Thus, difficulties in positioning and operation are experienced.
3. As shown in
FIG. 7
, in order to exchange the (slotted, Phillips, hexagonal and differently sized) screw driver bits
20
, the locating socket
14
and the adjustable shell
17
have to be screwed to the bottom to let the screw drier bit
20
project more. Therefore, the operator can pull out the screw driver bit
20
more easily. After completing the exchange work, the operator has to screw the locating socket
14
and the adjustable shell
17
back to the operational position, thereby causing much inconvenience.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to remove the above-mentioned drawbacks and to provide a joint adapter for a power drill screw driver which makes use of a sliding element and a resilient element to easily and rapidly complete the screwing work (including attaching the screw and exchanging a plurality of screw driver bits in a plurality of types and sizes) in order to enhance the operational efficiency and to meet the convenient and practical requirements.
REFERENCES:
patent: 3392767 (1968-07-01), Stillwagon, Jr.
patent: 5996452 (1999-12-01), Chiang
Chiu Kuo-Hsiung
Meislin D. S.
Troxell Law Office PLLC
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