Cutting – Tool or tool with support – Joint or connection
Reexamination Certificate
2002-06-20
2003-09-16
Shoap, Allan N. (Department: 3724)
Cutting
Tool or tool with support
Joint or connection
C083S698710, C083S699210, C083S699510, C083S581100, C083S783000, C030S329000, C030S507000, C030S513000, C403S321000
Reexamination Certificate
active
06619174
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority of Taiwanese application no. 091206676, filed on May 10, 2002.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a saw blade chuck, more particularly to a quick release saw blade chuck which can retain releasably one end portion of a saw blade to a driving arm of a scroll saw.
2. Description of the Related Art
Referring to
FIGS. 1 and 2
, a conventional scroll saw is shown to include a pair of upper and lower driving arms
12
,
13
that hold a saw blade
11
therebetween, a lower blade holder
14
, an upper blade holder
15
, a blade tension adjusting device
16
and a compression spring
17
. The saw blade
11
has a headed upper end portion
111
and a headed lower end portion
112
opposite to the upper end portion
111
. The lower blade holder
14
has a mounting end
141
mounted fixedly on the lower driving arm
13
, and a blade holder portion
143
that is formed with a notch
142
for engaging the lower end portion
112
of the saw blade
11
. The upper blade holder
15
has a mounting portion
151
mounted pivotally to the upper driving arm
12
, and a blade holder portion
153
that is formed with a notch
152
for engaging the upper end portion
111
of the saw blade
11
. The blade tension adjusting device
16
includes a threaded shank
161
that extends threadedly through the upper driving arm
12
and that is connected to the upper blade holder
15
at one end, and a rotary knob
162
mounted on the other end of the shank
161
. The compression spring
17
is sleeved on the shank
161
, and has one end abutting against the upper driving arm
12
and an opposite end abutting against the mounting portion
151
of the upper blade holder
15
.
In use, with the end portions
111
,
112
of the saw blade
11
engaging the upper and lower blade holders
14
,
14
, rotation of the rotary knob
162
in a first direction causes the shank
161
to move upwardly relative to the upper driving arm
12
, thereby causing the upper blade holder
15
to pivot in a first direction for increasing tension of the saw blade
11
and preventing removal of the saw blade
11
from the upper and lower blade holders
15
,
14
, as shown in FIG.
1
. On the other hand, rotation of the rotary knob
162
in a second direction opposite to the first direction causes the shank
161
to move downwardly relative to the upper driving arm
12
, thereby causing the upper blade holder
15
to pivot in a second direction opposite to the first direction for permitting removal of the saw blade
11
from the upper and lower blade holders
15
,
14
for replacement purposes, as shown in FIG.
2
.
The following are some of the drawbacks of the conventional scroll saw:
1. Quick attachment or removal of the saw blade
11
is not possible because of the need to rotate the rotary knob
162
before the upper blade holder portion
153
can be moved to engage or disengage from the upper end portion
111
of the saw blade
11
.
2. Proper adjustment of the saw blade tension cannot be conveniently conducted due to the threaded engagement between the shank
161
and the upper driving arm
12
. When the tension of the saw blade
11
is too high, the saw blade
11
tends to break easily. On the other hand, when the tension of the saw blade
11
is too low, the saw blade
11
tends to wobble during a cutting operation.
SUMMARY OF THE INVENTION
Therefore, the main object of the present invention is to provide a quick release saw blade chuck that can overcome the aforesaid drawbacks associated with the prior art.
Accordingly, a saw blade chuck of this invention is used to retain releasably one end portion of a saw blade to a driving arm of a scroll saw, and comprises:
a blade retaining unit having a mounting portion adapted to be mounted pivotally on the driving arm, and a blade holder portion that extends from the mounting portion, the blade retaining unit being pivotable relative to the driving arm to pivot from a first position, where the blade holder portion is adapted to engage the end portion of the saw blade, to a second position, where the blade holder portion is adapted to disengage from the end portion of the saw blade;
a biasing unit for biasing the blade retaining unit to pivot to the first position; and
a pushing unit operable so as to provide a pushing force for pushing the blade retaining unit in a linear direction to cause the blade retaining unit to pivot to the second position against biasing action of the biasing unit.
REFERENCES:
patent: 4949616 (1990-08-01), Chang
patent: 5016512 (1991-05-01), Huang
patent: 5105704 (1992-04-01), Chang
patent: 5327807 (1994-07-01), Chang
patent: 5363733 (1994-11-01), Baird et al.
patent: 5896799 (1999-04-01), Chen
patent: 5941153 (1999-08-01), Chang
patent: 6463840 (2002-10-01), Chang
Akin Gump Strauss Hauer & Feld L.L.P.
Nguyen Phong
Shoap Allan N.
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