Note: Descriptions are shown in the official language in which they were submitted.
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SAW BLADE ADJUSTING MECHANISM
BACKGROUND OF THE INVBNTION
The present invention relates to a saw blade, and
more particularly to a saw blade adjusting mechanism.
05 Typical saws comprise a saw blade solidly secured
to a handle for conducting sawing operation. The saw
blade may not be adjusted to different angles. US
Patent No. 5,271,158 to Chen discloses a saw blade
adjusting device for adjusting the saw blade to
different angles. However, only one end of the saw
blade may be retained in place. In addition, the saw
blade may be pulled to be broken by the screw.
The present invention has arisen to mitigate
and/or obviate the afore-described disadvantages of the
conventional saws.
SUMMARY OF THE INVENTION
The primary ohjective of the present invention is
to provide a saw blade that may be adjusted to
different angles and may be solidly retained in place.
ZO In accordance with one aspect of the invention,
there is provided a saw comprising a handle including
an upper portion and a bottom portion, a channel formed
in the upper portion of the handle, a beam including a
first end slidably engaged in the channel of the handle
and including a second end, a first rotary member
pivotally secured to the bottom portion of the handle,
an arm secured to the second end of the beam, the arm
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including a bottom portion, a second rotary member
pivotally secured to the bottom portion of the armt a
saw blade secured to the first rotary member and the
second rotary member and rotated in concert with the
05 first and the second rotary members, means for securing
the first rotary member to the handle, means for
positioning the second rotary member to the arm, and
means for moving the beam and the arm away from the
handle for separating the second rotary member from the
first rotary member and for retaining the saw blade in
place.
The first and the second rotary members each
includes at least one projection for engaging with and
for attaching the saw blade to the handle and the arm.
The first rotary member includes a plurality of
cavities, the handle includes a hole formed in the
bottom portion of the handle, the securing means
includes a knob slidably engaged in the hole of the
handle and having a key for engaging with the cavities,
and means for biasing the key to engage with the
cavities and to secure the first rotary member to the
handle.
The second rotary member includes a plurality of
notches, the positioning means includes a stop secured
in the bottom portion of the arm for engaging with the
notches of the rotary member and for positioning the
second rotary member to the arm.
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A spring means may bias the second rotary member
away from the stop when the arm and the beam are
located close to the handle.
The moving means includes an inclined bolt
05 extended upward from the upper portion of the handle, a
slide slidably engaged on the inclined bolt and having
a protrusion engaged with the first end of the beam,
and means for moving the slide along the inclined bolt
for moving the beam and the arm away from the handle.
Further objectives and advantages of the present
invention will become apparent from a careful reading
of a detailed description provided hereinbelow, with
appropriate reference to accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a saw in
accordance with the present invention;
FIG. 2 is an exploded view of the saw; and
FIGS. 3 and 4 are partial cross sectional views
illustrating the operation of the saw.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the drawings, and initially to FIGS.
1 to 3, a saw in accordance with the present invention
comprises a handle 10 includin~ a channel 11 formed in
top for engaging with one end 31 of a beam 30 which
includes the other end 33 secured to an upper end of an
arm 34. The arm 34 and the beam 30 may be solidly
secured together as a one piece member. The beam 30
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includes an indicating line 32 for engaging with the
handle 10 and for indicating the relative position
between the handle 10 and the beam 30. An inclined bolt
12 is extended upward from the upper portion of the
05 handle 10 for engaging with a nut 17. A slide 14 is
slidably engaged on the bolt 12 and includes a
protrusion 15 for engaging with the end 31 of the beam
30. The beam 30 and the slide 14 may both be moved
slightly forward (FIG. 4) when the slide 14 is moved
downward and forward by the nut 17.
A rotary member 20 is pivotally secured to the
bottom portion of the handle 10 by a pivot pin or screw
21 and includes one or two projections 22, 23 for
engaging with the end portion of the saw blade 50. The
rotary member 20 includes a number of cavities 24 and
includes a graduation 25 for indicating the rotational
angle of the rotary member 20. The handle 10 includes a
hole 18 for receiving a spring 28 and a knob 26. The
knob 26 includes a key 27 biased to engage with either
of the cavities 24 of the rotary member 20 by the
spring 28 such that the rotary member 20 may be secured
to the handle 10 at a selected angular position.
The arm 34 includes a space 35 formed in the
bottom for rotatably receiving another rotary member 36
at a pivot pin 37. The rotary member 36 also includes
two projections 38, 39 for engaging with the other end
of the saw blade 50. The rotary member 36 includes a
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number of notches 40 for engaging with a stop 41 which
is secured to the arm 34. A spring 42 is engaged on the
pin 37 and engaged with the rotary member 36 for
disengaging the rotary member 36 from the stop 41.
05 In operation, as shown in FIG. 3, the arm 34 is
located closer to the handle 10 and the indicating line
32 is located close to the handle 10 when the slide 14
has not be moved downward and forward along the bolt 12
by the nut 17. The rotary member 36 is disengaged from
the stop 41 by the spring 42 such that the rotary
member 36 may be rotated freely about the pin 37. When
the knob 26 is depressed against the spring 28 for
disengaging the key 27 from the rotary member 20, the
rotary member 20 may also be rotated to adjusting the
saw blade 50 to suitable angular position. The rotary
member 20 may be secured in place when the knob 26 is
released and when the key 27 is engaged with either of
the cavities 24 of the rotary member 20 again ~FIG. 4).
In addition, when slide 14 is moved downward and
forward along the bolt 12 by the nut 17, the beam 30
and the arm 34 may be moved forward such that the
rotary member 36 may be pulled rearward against the
spring 42 and such that the stop 41 may en~a~e with
either of the notches 40 of the rotary member 36 so as
to secure the rotary member 36 to the arm 34. The
indicating line 32 will move forward relative to the
handle 10 for indicating the relative position between
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the handle 10 and the beam 30.
It is to be noted that the beam 30 may be moved
forward for only a short distance, preferably about 2
mm, which is determined by the inclined angle of the
05 bolt 12, such that the saw blade 50 will not be over-
stretched.
Accordingly, the saw in accordance with the
present invention includes a saw blade that may be
adjusted to different angles and may be solidly
retained in place.
Although this invention has been described with a
certain degree of particularity~ it is to be understood
that the present disclosure has been made by way of
example only and that numerous changes in the detailed
construction and the combination and arrangement of
parts may be resorted to without departing from the
spirit and scope of the invention as hereinafter
claimed.
