Tools – Wrench – screwdriver – or driver therefor – Having work engaging and force exerting portion inserted...
Reexamination Certificate
2002-08-02
2004-06-08
Wilson, Lee D. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Having work engaging and force exerting portion inserted...
C081S177850
Reexamination Certificate
active
06745652
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a tool combining rod, particularly to one able to fix the engaging head member of quickly and firmly, with the engaging head member possible to be lengthened and applicable to an automatic, screwdriver.
Conventional tool combining rods are almost the same in structure. One conventional tool combining rod shown in
FIGS. 1
,
2
and
3
includes a rod member
1
and an engaging head member
2
. The rod member
1
is bored at the front end with a combining hollow
10
have the same shape as that of the rod portion
20
of the engaging head member
2
so as to let them combined together closely. The combining hollow
10
is bored with one or two bead holes
12
in its wall
11
for receiving a bead
13
, which is pressed by a sleeve
14
, as shown in
FIGS. 1 and 2
. Or the combining hollow
10
may have its wall
11
bored with a C-shaped groove
12
A for a C-shaped clasp
13
A to be fitted therein, as shown in FIG.
3
. Further, between the engage hole
12
and the engage bead
13
or between the C-shaped groove
12
A and the C-shaped clasp
13
A there must be a space and a little elasticity for the engage bead
13
and the C-shaped clasp
13
A to move around in order to permit the engaging head member
2
to be pulled out for replacing and inserted in place with easiness.
A fourth conventional tool combining rod, as shown in FIG.
4
, includes a rod member
1
provided with a combining hollow
10
having a hole
15
in the rear side, and a C-shaped groove
12
A in its wall for receiving a C-shaped clasp
16
. Thus, in case the engaging head member
2
has to be pulled out or replaced, an auxiliary tool
3
has to be inserted in the hole
15
and pushed the bottom of the engaging head member
2
outward so as to take out or replace the engaging head member
2
.
However, each of the four conventional tool combining rods described above needs to be provided with a bead hole
13
or an annular groove
21
in the rod portion
20
of the engaging head member
2
not only to let the engaging head member
2
fixed in position by the bead(s)
13
or the C-shaped clasps
13
A,
16
, but also enable the bead(s)
13
or the C-shaped clasp
13
A,
16
to move respectively in the bead hole
12
or in the C-shaped groove
12
A, thus letting the engaging head member
2
and the combining hollow
10
combined together or disengaged from each other smoothly and easily.
In view of the above-mentioned condition, the thickness L of the hollow wall
11
has to be set within a proper range. The conventional tool combining rods shown in
FIGS. 1
,
2
and
3
all have too large an outer diameter (over 7 mm) so they are not applicable to an automatic screwdriver
4
fitted with a screw band, but only available for a common tool having a comparatively short combining rod. The fourth conventional tool combining rod shown in
FIG. 4
has the outer diameter of its rod member
1
diminished to conform to the foresaid automatic screwdriver. Under this condition, after the engaging head member
2
is combined with the combining hollow
10
of the rod member
1
, the engaging head member
2
is closely stuck by the C-shaped clasp
16
in such a condition that it can hardly be pulled out by hand, and so the rod member
1
has to be bored with the side hole
15
for an auxiliary tool
3
to insert therein and prop out the engaging head member
2
by means of an auxiliary tool. However, the side hole
15
bored in the wall of the rod member
1
will reduce the strength of the rod member
1
, possible to render the tool combining rod
1
twisted, deformed and broken off at the location of the side hole
15
in the event of the twisting force of combination being too large.
Still the fifth conventional tool combining rod shown in
FIG. 5
, includes a rod portion
1
having a combining hollow
10
in the front end. The combining hollow
10
has its annular wall
11
bored with a bead hole
12
for receiving a bead
13
. A contractible spring
14
is provided on the outer side of the hollow wall
11
of the combining hollow
10
, having one end pushing against the annular surface
111
of the hollow wall
11
and the other end pushing against the inner annular surface
140
of a slide sleeve
14
A, and positioned between the slide sleeve
14
A and the hollow wall
11
of the combining hollow
10
. Besides, the combining hollow
10
has its wall provided annularly with a C-shaped clasp
112
to prevent the slide sleeve
14
A from slipping off. The slide sleeve
14
A has its front end formed with an inner sloping annular edge
141
so as to let the combination of the bead(s)
13
with the engaging head member
2
able to be loosened for facilitating removing or replacing the engaging head member
2
.
As described above, the fifth conventional tool combining rod shown in
FIG. 5
has a slide sleeve
14
A provided on the rod member
1
for replacing the engaging head member
2
easily, but the outer diameter d
1
of the slide sleeve
14
A is much larger than the outer diameter d
2
of the rod member
1
. As a result, such a tool combining rod provided with two combining components is not applicable to an automatic screwdriver
4
. In operating, the automatic screwdriver
4
used at the present usually has a screw screwed out and then screwed into an objective, and the automatic screwdriver unit
42
may recover its original position by the recovering resilience of the contractible spring
14
. At this time, the outer annular wall of the tool combining rod is positioned in a screw bend hole
401
and wrapped by the annular wall of a screw hole
402
. If the tool combining rod is too large, it is hard for the automatic screwdriver tool unit
42
to recover its original position, failing to operate smoothly.
Therefore, the tool combining rod employed today has a small outer diameter and is made integral as one
1
C, as shown in
FIGS. 6
,
7
and
8
, but this integrally made tool combining rod
1
C may become unusable and has to be replaced or cast away in case the engage portion
22
of its engaging head member
2
is worn off, increasing cost in using.
SUMMARY OF THE INVENTION
This invention is devised to offer a tool combining rod having a small outer diameter (less than 7 mm) and applicable to an automatic screwdriver, able to be operated smoothly and lower cost in manufacturing.
The present invention has the following features.
1. The tool combining rod consists of a rod member having one end formed with a non-round and equiangular portion to be combined with a drive tool for transmitting power, and the other end provided with a combining hollow and having an outer diameter smaller than or equal to the largest outer diameter of foresaid non-round surface, with the combining hollow provided with an inner annular surface for facilitating receiving an engage member.
2. The engage member is bored with a central hole for receiving the rod portion of the engaging head member, and provided with an elastic annular surface for combining with the inner annular surface of the combining hollow of the rod member and firmly holding the engaging head member to prevent it from slipping off.
3. The tool combining rod is composed of a rod member, an engaging head member and an engage member, therefore in case the engaging head member is worn off due to driving screws, it needs only to replace the engaging head member, reducing expenditure of a user.
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patent: 4581962 (1986-04-01), Marbourg
patent: 4651596 (1987-03-01), Rachanski
patent: 4960015 (1990-10-01), Mathews
patent: 5469679 (1995-11-01), Burkard et al.
patent: 5867912 (1999-02-01), Hickok et al.
patent: 5938212 (1999-08-01), Wadsworth
patent: 6112623 (2000-09-01), Bigand et al.
patent: 6138530 (2000-10-01), McClure
patent: 6282999 (2001-09-01), Hite et al.
patent: 6401573 (2002-06-01), McClure
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