Scroll saw with a saw blade that is easy to replace

Details Scroll saw with a saw blade that is easy to replace Scroll saw with a saw blade that is easy to replace

2003-03-27

2004-04-27

Shoap, Allan N. (Department: 3724)

Cutting

By tool reciprocable along elongated edge

With means to support tool at opposite ends

C083S581100, C083S698710, C083S699210

Reexamination Certificate

active

06725757

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority of Taiwanese application no. 092202516, filed on Feb. 18, 2003.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a scroll saw, more particularly to a scroll saw with a saw blade that is easy to replace.
2. Description of the Related Art
Referring to
FIG. 1
, a conventional scroll saw
1
is shown to include a pair of upper and lower driving arms
11
,
12
, a shank
13
, a rotary knob
14
, a biasing member
15
, an upper blade holder
16
, a lower blade holder
17
, and a saw blade
18
. The shank
13
is formed with a threaded section
131
that extends through a distal end
111
of the upper driving arm
11
so as to engage the rotary knob
14
, and a coupling section
132
opposite to the threaded section
131
and coupled to the upper blade holder
16
. The biasing member
15
is sleeved on the coupling section
132
and has one end abutting against the upper driving arm
11
and an opposite end abutting against the upper blade holder
16
. The lower blade holder
17
is mounted fixedly on the lower driving arm
12
. The saw blade
18
has an upper end portion
181
that engages removably the upper blade holder
16
, and an opposite lower end portion
182
that engages removably the lower blade holder
17
.
In use, when the rotary knob
14
is rotated to move the shank
13
upwardly, the upper blade holder
16
will move accordingly for increasing the tension of the saw blade
18
and for preventing removal of the saw blade
18
from the upper and lower blade holders
16
,
17
. On the other hand, when the rotary knob
14
is rotated to move the shank
13
downwardly, the saw blade
18
can be removed from the upper and lower blade holders
16
,
17
for replacement purposes.
The following are some of the drawbacks of the aforesaid conventional scroll saw
1
:
1. Quick attachment or removal of the saw blade
18
is not possible because of the need to rotate the rotary knob
14
before the upper blade holder
16
can be moved to engage or disengage from the upper end portion
181
of the saw blade
18
.
2. Proper adjustment of the blade tension cannot be conveniently conducted due to the threaded engagement between the shank
13
and the rotary knob
14
. When the tension of the saw blade
18
is too high, the saw blade
18
tends to break easily. On the other hand, when the tension of the saw blade
18
is too low, the saw blade
18
tends to wobble during a cutting operation.
SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to provide a scroll saw that can overcome the aforesaid drawbacks associated with the prior art.
Accordingly, a scroll saw of this invention comprises:
upper and lower driving arms, each of which has a distal end;
a saw blade having upper and lower blade ends;
a blade retaining unit including a lower blade holder mounted on the distal end of the lower driving arm to hold removably the lower blade end, a pivot seat mounted pivotally on the distal end of the upper driving arm, and an upper blade holder mounted on the pivot seat, the pivot seat being pivotable relative to the upper driving arm from a first position, where the upper blade holder engages the upper blade end, to a second position, where the upper blade holder disengages from the upper blade end;
a push rod having a connecting end coupled to the pivot seat, and a pressing end opposite to the connecting end;
a biasing unit for providing a biasing force that enables the pivot seat to pivot to the first position; and
an actuating unit operable so as to provide a pressing force on the pressing end of the push rod for enabling the push rod to push the pivot seat to pivot to the second position against biasing action of the biasing unit so as to permit release of the saw blade from the upper and lower blade holders.


REFERENCES:
patent: 4603614 (1986-08-01), Charonnat
patent: 4681006 (1987-07-01), Miller
patent: 4825741 (1989-05-01), Wellington et al.
patent: 5088369 (1992-02-01), Rice et al.
patent: 5327807 (1994-07-01), Chang
patent: 5662017 (1997-09-01), Mellon
patent: 5992283 (1999-11-01), Chen
patent: H1867 (2000-10-01), Quiram
patent: D446228 (2001-08-01), Hsu
patent: 6463840 (2002-10-01), Chang
patent: 6474211 (2002-11-01), Lin
patent: 6619174 (2003-09-01), Chiang

Affiliated with

Also associated with

Rating

Scroll saw with a saw blade that is easy to replace does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Scroll saw with a saw blade that is easy to replace, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scroll saw with a saw blade that is easy to replace will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3230917