Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
CA 02488074 2004-11-19
TITLE: ANGLE ADJUSTABLE SAWING TABLE
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention is related to an angle adjustable sawing table, and more
particularly, to one that allows direct measurement of geometric angles of
wood
materials for cutting.
(b) Description of the Prior Art:
A sawing table on site is perhaps the most important tool in any decoration
job
1 o for a carpenter. Usually the table has a foundation comprised of four
pieces of boards
including two girders and two stretchers with a table inserted on the top and
a circular
saw below the table.
In the prior art, the board is placed on the table and measured by manual for
the
geometric angle and the finished size to be cut; then marked when the angle is
solved
i 5 for the circular saw to cut the board into the size and angle desired.
However, in the
absence of any measurement tools designed to the sawing table, all the
measurement
and geometric angle must be done manually resulting in wasting of time, and
poor
accuracy and efficiency.
2 o SUMMARY OF THE INVENTION
The primary purpose of the present invention is to provide a sawing table that
saves the efforts of manual measurement. To achieve the purpose, the present
invention is adapted with control and measurement units and allowing
adjustment of
angle. The control unit facilitates the installation of a circular saw
depending on the
25 size of the circular saw, the thickness and the width of the board. A
turning arm of
the measurement unit is turned to the location preset for the cutting angle,
and the
board is placed on the table and flushed against the turning arm, the circular
saw
traveling on the rectangular rail isled to cut.
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BRIEF DESCRIPTION OF THE DRAWIrIGS
Fig. 1A is a perspective view showing an assembly of a saw table of the
present
invention.
Fig. 1 B is an exploded view of the present invention.
Fig. 1 C is a schematic view showing the bottom of a top of the saw table of
the
present invention.
Fig. 2A is a perspective view showing the appearance of a connection block of
a
control unit of the present invention.
Fig. 2B is a section view of the connection block of the control unit of the
1 o present invention.
Fig. 3A is a schematic view showing the guide rail facing up of the control
unit.
Fig. 3B is a schematic view showing the guide rail facing down of the control
unit.
Figs. 4A, 4B, 4C, 4D, 4E, and 4F are side sectional views showing the
adjustment of thickness and width of the control unit of the present
invention.
Figs. 4G, 4H, and 4I are front sectional views showing the adjustment of
thickness and width of the control unit of the present invention.
Figs. 5A and SB are schematic views showing the layout of the control unit
before the measurement of the angle by a square.
2 o Fig. 6A is a schematic view showing the angle measurement by the square.
Figs. 6B and 6C are schematic views showing the adjustment of the hxrning arm
to cut on the saw table after the measurement of the angle by the square.
Fig. 7A is a schematic view showing the measurement of another angle by the
square.
2 5 Fig. 7B is a schematic view showing the adjustment of the tuning arm to
cut on
the saw table after the measurement of the angle by the square.
Fig. 8 is a schematic view showing that a circular saw is cutting a board.
Fig. 9 is a schematic view showing another gear set is adapted to where
beneath
the saw table of the present invention.
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to Figs. 1A, 1B, 1C, 2A, 2B, 3A and 3B, the present invention is
essentially comprised of a table 1, a top 11, a control unit 2 and a
measurement unit 3.
The table 11 is provided on one side a longitudinally recessed guide trough 12
to
be inserted with a plank 1 A in the same size of the guide trough 12, and the
plank 1 A
is secured to the table 11 with multiple screws 1B penetrating from beneath
the top 11.
As a circular saw 4 is processing on a board 4A, it cuts farthest into the
plank 1A
without damaging the top 11. Besides, the plank 1 A is a consumption item and
replaced at any time when worn and out to a certain extent. Each side of both
shorter
1 o sides of the guide trough 12 is provided with a positioning hole 13 and a
guide rail slot
14 for the assembly and positioning of two pairs of connection blocks 2B from
the
control unit 2. An axial hole 15 penetrating through the table 11 on one side
of the
guide trough 12 where the guide rail slot 14 is provided.
The control unit 2 comprised of a pair of guide rails 2A and two pairs of the
connection blocks 2B is provided on the top 11 at the same side where the
guide
trough 12 is located. One pair of the connection blocks 2B is raised and
locked to the
positioning holes 13 disposed at both ends on one side of the table 11 using
two screws
1B and two winged nuts 1C. Similarly, another pair of the connection blocks 2B
is
raised and locked to the guide rail slot 14 on the inner side of the table 11
with two
2 o screws 1 B and two winged nuts 1 C. The pair of the connection blocks 2B
on the
guide rail slot 14 is readily free to reciprocally travel thereon by loosening
the
winged-nuts 1C. The pair of guide rail 2A is provided striding over the plank
1A by
means of those two pairs of the connection blocks 2B erected on the top 11. A
chamber 2A1 defined in each end of the pair of the guide rails 2A merely
2 5 accommodates its respective connection block 2B. A screw hole 2A2 is each
provided on both sides of the chamber 2A1, and a mufti-sectional adjustment
channel
2B 1 hollowed in "E" shape is each provided on both sides of the connection
block 2B
for the screw 1 B and the winged-nut 1 C to lock each connection block to the
guide rail
2A. Accordingly, the pair of the guide rails 2A is integrated with both pairs
of the
3 o connection blocks 2B.
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The measurement unit 3 is comprised of a turning arm 3A and a gear set. A
shaft 3A1 extends from the bottom of the fixed end of the turning arm 3A and
passes
downward through an axial hole 15 on the top 11 to be pivoted to the gear set
disposed
beneath the top 11. A square hole 3A3 and a magnifier 3C are provided on the
s surface 3A2 at where closer to the free end of the turning arm 3A. The
square hole
3A3 is disposed at where in relation to an arc hole 16 penetrating through the
top 11,
and a handle 3D is inserted through the square hole 3A3 and the arc hole 16 to
lock the
turning arm 3A to the top 11 to control turning and positioning of the turning
arm 3A
for facilitating the adjustment of the cutting angle. A miter age 17 of the
same curve
1 o as that of the arc hole 16 is provided on the top 11 over the arc hole 16
for the angle
adjustment by the turning arm 3A, and for turning the magnifier 3C provided on
the
surface 3A2 of the turning arm 3A to magaify the scales of the miter gage 17
to
facilitate observation and measurement. The gear set is comprised of a large
gear 3E,
a medium gear 3F, and a small gear 3G in a specific gear ratio of 1:2.
Wherein, the
15 large gear 3E is provided at where the axial hole 15 is located below the
top 11, and an
axial hole 3E1 at the center of the large gear 3E and the shaft 3A1 of the
turning arm
3A is inserted into the axial hole 3E1. A screw 3H adapted with a washer
penetrates
through the turning arm 3A, the axial hole 15 and the large .gear 3E. The
medium
gear 3F and the small gear 3G are in sequence secured to where beneath the top
11
2o with a screw 1B with the small gear 3G located between the large gear 3E
and the
medium gear 3F to engage to one another to become a synchronous link
subsystem.
The medium gear 3F indicates a semi-circular shape and is connected on its
side not
provided with teeth to a rule 3F1 for a square 5 comprised of two rules at
right angle to
each other to flush against to directly calibrate the swinging angle of the
turning arm
2s 3A.
The circular saw 4 provided striding between the pair of guide rail 2A of the
control unit 2 to reciprocally travel on the pair of guide rail 2A in smooth
and reliable
fashion to help upgrade sawing quality of the finished product of the board
4A.
Furthermore, installation site on the table 1 for the circular saw 4 depending
on its size
3 o can be adjusted in conjunction with the pair of guide rail 2A and two
pairs of the
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connection blocks 2B to process the board 4A in different width and thickness.
Now referring to Figs. 4A, 4B, 4C, 4D, 4E, 4F, 4G, 4H, and 4I, wherein, both
ends of each rail rise to be tightly caught in their respective chambers 2A1
upon
adjusting the pair of guide rail 2A. Multiple screws 1 B and winged nuts 1 C
secure
each connection block 2B into each chamber 2AI through the screw hole 2A2 and
the
multx-sectional adjustment channel 2B1. Accordingly, both guide rails 2A
stride over
and are locked to those two pairs of the connection blocks 2B. Whereas the
guide rail
slot 14 on the top 11 permits the pair of the connection blocks 2B to
reciprocally travel
in the guide rail slot 14 by fast loosening and retightening their respective
screws 1B
1 o and winged nuts 1 C, both guide rails 2A move synchronously to have the
width
between both guide rails 2A adjusted for compromising the specification of the
circular saw 4 to be installed on the table 1 depending on the width and
thickness of
the board 4A placid on the top 11 for cutting.
By fast loosening and retightening those screws I B and winged nuts 1 C- that
~ 5 lock up the pair of guide rail 2A to their respective connection blocks
2B, both pairs of
the connection blocks 2B are adjusted to permit longitudinal movement of both
ends
of the pair of guide rails 2A for ascending or descending the circular saw 4
disposed
between both guide rails 2A according to the specification of the circular saw
4 until it
could handle the thickness of the board 4A. Accordingly, those screws 1 B and
2 o winged nuts 1 C are retightened to hold the circular saw 4 at a proper
working height
depending on the thickness of the board 4A to be placed on the top 11 for the
circular
saw 4 to cut.
The cutting angle of the board 4A is directly adjusted by the measurement unit
3
on the top 11 for the circular saw 4 to cut the board 4A into the preset
angle. Manual
25 measurement and solving the angle to mark the angle'on the board 4A for the
circular
saw 4 to cut by following the mark as required in the prior art are no longer
necessary.
To make the measurement of the angle as illustrated in Figs. 5A, SB, 6A, 6B,
6C,
7A, and 7B, one rule of the square 5 is placed on the table l, and the medium
gear 3F
is turned until its rule 3F1 is flushed against the other rule of the square
5. Whereas
3o both of the small gear 3G and the large gear 3E are synchronously linked to
the
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medium gear 3F, the turning arm 3A integrated with the large gear 3E with the
screw
3H adapted with a washer is also turned to reach the preset angle. The turning
arm
3A is secured in position at the preset angle by loosening and retightening
the handle
3D pivoted through the square hole 3A3 on the turning arm 3A and the arc hole
16 on
s the top 11. The board 4A is placed on the top 11 to firmly flush against the
tuning
arm 3A held in position at the preset angle. The circular saw 4 installed on
the pair of
the guide rails 2A then cuts the board 4A following the preset angle.
Alternatively, the magnifier 3C provided on the surface 3A2 of the turning arm
3A on the top 11 magnifies the miter gage 17 is used to observe the
mea,SUrement.
1 o Once the tuning arm 3A is turned to the location pinpointed by the miter
gage 17, the
handle 3D is loosened and retightened again to hold the turning arm 3A at the
location
of the miter gage 17 as observed, and the board 4A is placed on the top 11
until it is
firmly flushed against the tuning arm 3A for the circular saw 4 installed on
the pair of
the guide rails 2A to cut the board 4A at the preset angle.
1 s Accordingly, the table 1 of the present invention cuts the board 4A
without
having to do the manual calculation of the geometric angle for the board 4A
and
avoids the possible inaccuracy in solving the preset angle simply by measuring
the
geometric angle with the square 5 and directly placing one rule of the square
S on the
table 1 and the other rule flushed against the rule 3F1 of the medium gear 3F
to adjust
2 o the tuning arm 3A to reach at the present angle for the circular saw 4
installed on the
pair of the guide rails 2A to cut the board 4A at the preset angle.
As illustrated in Fig. 9, the gear set of the present invention can be
comprised of
the large gear 3E, the medium gear 3F and a drive belt 3J at the gear ratio of
1:2.
Wherein, the large gear 3E is placed at where the axial hole 15 is located
beneath the
25 top 11, and the axial hole 3E1 at the center of the large gear E is
inserted by the shaft
3A1 of the turning arm 3A. The screw 3H adapted with a washer connects the
turning arm 3A, the axial hole 15 and the large gear 3E into a one piece. The
medium gear 3F is fixed to where beneath the top 11 with the screw 1B, and the
drive
belt 3J is inserted at where between the large gear 3E and the medium gear 3F
to link
so both gears 3E, 3F for synchronous movement to have the turning arm 3A
integrated
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with the large gear 3E by means of the screw 3H adapted with a washer to
arrive at the
preset angle. One upholding rod 3I is each provided on both sides of the drive
belt 3J
disposed between the large and the medium gears 3E, 3F. A head 3I1 of the
upholding rod 3I merely contacts the outer edge of the driver belt 3J to
prevent the
drive belt 3J from falling off its place during the transmission of both the
large and the
m~lium gears 3E, 3F as driven by the drive belt 3J.
Furthermore, as illustrated in Fig. 8, the board 4A is placed at a right angle
on
the top 11 of the table l, and the space on the top 11 is not sufficient for
the placement
of the board 4A due to the presence of the tuning arm 3A of the measurement
unit 3
io on the top 11. The turning arm 3A of the measurement unit 3 on the top 11
is
removed before placing the board 4A on the top 11 at a right angle.
It is to be noted that the preferred embodiments disclosed in the present
invention are not used to limit the scope of the present invention, and that
any
equivalent change and d~oration to the form, construction, characteristics and
~ 5 teaching described in the Claims of the present invention shall be deemed
as falling
within the scope of those Claims.
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