Information
-
Patent Grant
-
6530299
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Patent Number
6,530,299
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Date Filed
Tuesday, November 20, 200122 years ago
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Date Issued
Tuesday, March 11, 200321 years ago
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Inventors
-
-
Examiners
Agents
- Troxell Law Office PLLC
- Chiu; Kuo-Hsiung
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CPC
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US Classifications
Field of Search
US
- 081 451
- 081 900
- 081 125
- 081 429
- 081 438
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International Classifications
-
Abstract
The present invention relates to a joint adapter for a power drill screw driver having a driving shaft, a slide socket, a compression spring, a packing ring and a screw driver bit. The driving shaft is provided with an insertion groove and an insertion piece. A neck is located in the middle of the driving shaft. A strong magnet is fixed at the front end of the axial insertion hole. A clamping ring is arranged at a proper place of the axial insertion hole. The compression spring is inserted around the neck of the driving shaft and rests on the clamping ring of the slide socket. The packing ring closely sits at the end of the neck of the driving shaft in a tight state while the compression spring presses against the packing ring so that the compression spring and the slide socket are located in place. A plurality of screw driver bits in a plurality of shapes and sizes each being selectively inserted into the insertion groove of the driving shaft for tightening the screws.
Description
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.
BRIEF DESCRIPTION OF THE DRAWINGS
The accomplishment of this and other objects of the invention will become apparent from the following description and its accompanying drawings of which:
FIG. 1
is a perspective exploded view of a preferred embodiment of the present invention;
FIG. 2
is a longitudinally sectional view of
FIG. 1
after assembly;
FIG. 3
is a schematic drawing of the operation of
FIG. 1
after assembly;
FIG. 4
is another schematic drawing of the operation of
FIG. 1
after assembly;
FIG. 5
is a perspective exploded view of a conventional joint adapter for a power drill screw driver;
FIG. 6
is a side view of
FIG. 5
after assembly; and
FIG. 7
is a schematic drawing of the operation of
FIG. 5
after assembly.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
First of all, referring to
FIGS. 1 and 2
, the joint adapter
80
for a power drill screw driver in accordance with the present invention includes a driving shaft
30
, a slide socket
40
, a compression spring
50
, a packing ring
60
and a screw driver bit
70
. The driving shaft
30
is provided with an insertion groove
31
and an insertion piece
32
at each end, respectively. A neck
33
is located in the middle of the driving shaft
30
. The slide socket
40
with an axial insertion hole
41
surrounds the driving shaft
30
. A strong magnet
42
is fixed at the front end of the axial insertion hole
41
. A clamping ring
43
is arranged at a proper place of the axial insertion hole
41
. The compression spring
50
is inserted around the neck
33
of the driving shaft
30
and rests on the clamping ring
43
of the slide socket
40
. The packing ring
60
sits closely at the end of the neck
33
of the driving shaft
30
in a tight state while the compression spring
50
and the slide socket
40
are located in place. The screw driver bit
70
in a plurality of shapes and sizes is inserted into the insertion groove
31
of the driving shaft
30
for tightening the screws
72
.
Based on the assembly of the above-mentioned components, a contact tip
71
of the screw driver bit
70
is inserted in the head of the screw
72
so that the slide socket
40
pops forward to be attached with the screw
72
because of the attraction power of the strong magnet
42
. Accordingly, a high-speed rotation of the power drill screwdriver can be performed without expected detachment.
In exchanging the screw driver bit
70
, as shown in
FIG. 4
, it's only required to move the slide socket
40
in the direction of the insertion piece
32
of the driving shaft
30
to the bottom end. Therefore, the screwdriver bit
70
projects from the opening of the slide socket
40
in order for the user to hold it for rapid exchange.
Many changes and modifications in the above-described embodiments of the invention can, of course, be carried out without departing from the scope thereof. Accordingly, to promote the progress in science and the useful arts, the invention is disclosed and is intended to be limited only by the scope of the appended claim.
Claims
- 1. A joint adapter for a power drill screw driver comprising:a) a driving shaft having an insertion groove at a first end, an insertion piece at a second end, and a neck located in a middle of said driving shaft, wherein the first end is larger in cross-section than the neck and second end; b) a screw driver bit removably plugged into said insertion groove of said driving shaft, the screw driver bit having a contact tip; c) a slide socket movably mounted on said driving shaft so as to surround the enlarged first end of the driving shaft, the slide socket having an axial insertion hole, a magnet fixed at a front end of said axial insertion hole and an inwardly extending clamping ring located so as to contact the larger cross-section first end thereby limiting movement of the slide socket relative to the driving shaft such that the contact tip always extends outwardly of the slide socket through the axial insertion hole; d) a packing ring mounted on the neck of said driving shaft; and, e) a compression spring located around said neck of said driving shaft between the packing ring and the clamping ring of said slide socket.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3392767 |
Stillwagon, Jr. |
Jul 1968 |
A |
5996452 |
Chiang |
Dec 1999 |
A |