Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Reexamination Certificate
2000-11-14
2002-09-03
Smith, James G. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
C081S490000, C081S177400
Reexamination Certificate
active
06443037
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an improved screwdriver grip structure, and more particularly to a screwdriver grip structure which is able to firmly connect with an elongated tool head and can be easily carried. Moreover, the screwdriver grip structure is able to bear greater axial application force.
FIGS. 7 and 8
show a conventional screwdriver having a grip
8
. The rear section of the grip
8
is formed with a differential hole
81
having a profile complementary to the profile of the ratchet seat
91
of the ratchet mechanism
9
. The ratchet seat
91
is restricted by the wall of the differential hole
81
from rotating. A cap
82
is screwed on the rear end of the grip
8
for fixing the ratchet mechanism
9
. A connecting rod
92
.of the ratchet mechanism
9
forward extends in the grip
8
for connecting with a cooperative elongated tool head
93
.
In use, an axial pushing force is exerted onto the tool head
93
for leaning the tool head against a work piece. The ratchet mechanism
9
is fixed in the differential hole
81
by the cap
82
screwed on the grip
8
so that the axial application force of the tool head
93
will be totally borne by the cap
82
. Accordingly, in the case of greater application force of the tool head
93
, the cap
82
may be pushed away by the ratchet mechanism
9
and the ratchet mechanism
9
may drop out of the grip
8
.
FIGS. 9 and 10
show another type of conventional screwdriver having a grip
7
. The grip
7
is formed with multiple elongated receiving cavities
71
extending from front end to rear end. Multiple elongated tool heads
72
are received in the receiving cavities
71
. A cap
73
is disposed at front end of the grip
7
for stopping the tool heads
72
from dropping out of the receiving cavities
71
. The cap
73
is formed with an opening
731
corresponding to the receiving cavities
71
, whereby the tool heads
72
can extend outward through the opening
731
. The cap
73
is formed with a central through hole
732
corresponding to a connecting socket
701
of the grip
7
. The opening
731
extends toward the center of the cap
73
and communicates with the central through hole
732
. After the tool head
72
extends out, an enlarged section (not shown) of rear end of the tool head
72
is engaged in the opening
731
to prevent the tool head
72
from dropping out from the cap
73
. Then the tool head
72
is transversely moved into the through hole
732
and inserted into the connecting socket
701
of the grip
7
. Accordingly, the tool head
72
is fixed in the grip
7
for use.
Such screwdriver is able to conveniently receive elongated tool heads
72
and can be easily carried. However, the cap
73
is disposed at front end of the grip
7
so that it is impossible to lay a ratchet mechanism in the front end of the grip
7
as the conventional ratchet screwdriver. This leads to inconvenience in use. Furthermore, the rear end of the tool head
72
is formed with an enlarged section for engaging in the opening
731
. This increases difficulty in manufacturing and cost therefor.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a screwdriver grip structure in which the connecting rod of the ratchet mechanism disposed in the rear section of the grip is connected with a sleeve fitted into the grip from front end thereof. The tool head is connected with the sleeve. The sleeve has a large diameter section and the central hole of the grip has an enlarged section for the large diameter section to engage therein. The large diameter section of the sleeve is leant against the enlarged section so as to bear greater axial application force in use of the screwdriver. Therefore, the screwdriver is more durable.
It is a further object of the present invention to provide the above screwdriver grip structure in which the grip is formed with multiple elongated receiving cavities extending from front end to a portion near rear end. Therefore, various kinds of tool heads can be placed in the receiving cavities of the grip so as to greatly reduce the volume of the tool kit for easy carriage.
REFERENCES:
patent: 3824881 (1974-07-01), Wright
patent: 4485699 (1984-12-01), Fuller
patent: 4976175 (1990-12-01), Hung
patent: 5174178 (1992-12-01), Disston
patent: 5228363 (1993-07-01), Corona et al.
patent: 5749271 (1998-05-01), Liu
patent: 5806381 (1998-09-01), Lin
patent: 6237451 (2001-05-01), Wei
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