BACKGROUND OF THE INVENTION
Field of the Invention
[0001] The present invention relates to a flip over saw including a main body having a saw
blade driven to rotate and a table at which the main body is held movable up and down,
and a base at which the table and the main body are held rotatable 180 degrees. The
flip over saw can be used as a miter saw when the main body is positioned over the
table, and can be used as a table saw when the main body is positioned under the table
protruding the saw blade over the table.
Description of the Related Art
[0002] A conventional flip over saw has a rectangular mounting base on which a table is
horizontally supported rotatable 180 degrees around a center portion of the table
and capable of being secured even if either one or the other surface of the table
faces upwardly. Moreover, on one side of the table a main body is pivotally mounted
movable up and down, and the main body has a saw blade which rotates driven by a motor.
With this configuration, the flip over saw can be used as a miter saw when the main
body is positioned over the table, in which the main body is lowered to cut a workpiece
disposed on the table. On the other hand, the flip over saw can be used as a table
saw when the main body is positioned under the table by rotating the table with a
condition that the saw blade is secured at a bottom dead center to penetrate the table
downwardly. In a table saw mode, a workpiece on the table can be slid with respect
to the saw blade and cutting is conducted. As this kind of flip over saw, the U. S.
Patent No. 5787779 discloses a well-known structure.
[0003] In such a flip over saw as described in the above patent, a heavyweight motor is
located at the rear side of the table when it is used as a miter saw, so that the
table is unbalanced and prone to rotate. With this configuration, malfunctional table
rotation might damage the table and the main body. In addition, the reverse operation
of the table becomes hard since the center of gravity of the table being far from
the center of rotation generates a large centrifugal force in reversing, thereby lowering
operability.
[0004] In order to solve this, an object of the present invention is to provide a flip over
saw which prevents the table's accidental rotation while excellent operability in
reversing the table is secured.
SUMMARY OF THE INVENTION
[0005] In order to achieve the above object, the first aspect of the present invention is
characterized in that the motor is located adjacent to the upper side of the center
of rotation of the table with the main body being at the top dead center when the
main body is positioned above the table.
[0006] The second aspect of the present invention is characterized in that, in addition
to the object of the first aspect, reversing of the table for conversion from a miter
saw mode to a table saw mode is conducted by flipping up the front part of the table.
With this configuration, the center of motor is located in front of the center of
rotation of the table with the main body being at the top dead center in a miter saw
mode in order to prevent the accidental rotation of the table more effectively.
[0007] The third aspect of the present invention is characterized in that, in addition to
the objects of the first and second aspects, the main body is pivotally mounted on
a support arm via a support shaft rotatably in the upper and lower direction. Then,
the distance between the center of rotation of the table and the center of motor is
shorter than that between the center of rotation of the table and the center of the
support shaft with the main body being at a bottom dead center in a miter saw mode
in order to obtain excellent operability in reversing the table from the miter saw
mode position to the table saw mode position.
[0008] It should be noted that in the present invention, the motor is located adjacent to
the upper side of the center of rotation of the table indicates not only locating
the center of motor right above the center of rotation, but locating it at the area
slightly moving back and forth therefrom.
[0009] According to the first aspect of the present invention, since the table is well-balanced
in the miter saw mode, the table is protected from being reversed even if locking
of the table is released by malfunction. As a result, damage to the table and the
main body caused by accidental reverse of the table can be prevented. In addition,
since the center of gravity is positioned near the center of rotation, the table's
reverse operation becomes easier, thereby improving operability.
[0010] According to the second aspect of the present invention, in addition to the effect
of the first aspect, reversing of the table for conversion to the table saw mode is
conducted by flipping up the front part of the table upwardly. By doing this, the
center of gravity is positioned to the front, thereby preventing the accidental reverse
of the table from the miter saw mode more effectively.
[0011] According to the third aspect of the present invention, in addition to the effect
of the first or second aspect, since the motor is closer to the center of rotation
of the table the moment of inertia in reversing becomes small, so that reversing can
be conducted easily with a light pressure. Therefore, an excellent operability can
be achieved in reversing the table upon conversion from the miter saw mode to the
table saw mode.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012]
Fig. 1 is an overall view of a flip over saw (in the miter saw mode).
Fig. 2 is a plain view of the flip over saw.
Fig. 3 is an explanation view showing a locking state at the bottom dead center.
Fig. 4 is an explanation view of a flip over saw (in the table saw mode).
Fig. 5 is an explanation view showing a positional relationship between a motor and
a rotating shaft.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0013] Hereinafter, embodiments of the present invention will be explained with reference
to the drawings.
[0014] Fig. 1 is an overall view showing an example of a flip over saw and Fig. 2 is a plain
view thereof. A flip over saw 1 has a base 2 which is a mounting in rectangular shape
in a plain view and a table 3 placed on the base 2, and a saw blade unit 4 mounted
on the table 3. The table 3 is held rotatable 180 degrees around the rotating shafts
5, 5 extending in the lateral direction (in Figs. 1 and 2, the right is forward).
Moreover, the table 3 can be secured in a horizontal state by a stopper mechanism
6 even if either one or the other surface of table 3 faces upwardly. The table 3 also
has a circular turntable 7 which is horizontally turnable, and a guide fence 8 parallel
to the rotating shaft 5 so as to transverse on the turntable 7.
[0015] The saw blade unit 4 has a support arm 9 standing at the rear part of the turntable
7 and a main body 11 held to be movable up and down by a support shaft 10 at the upper
end of the support arm 9. At the left side of a blade cover 12 which is a housing
of the main body 11, a motor 13 and a handle 14 are provided. In the blade cover 12,
a circular saw blade 15 driven to rotate by the motor 13 is provided. The main body
11 is urged toward the top dead center as shown in Fig. 1 by a torsion spring (not
shown) provided on the support shaft 10. As shown in Fig. 3, the main body 11 is lowered
to the bottom dead center where it penetrates a slit (not shown) provided at the center
of the turntable 7 when a handle 14 is held down. Then a workpiece on the turntable
7 can be cut by the rotating saw blade 15. In this way, the flip over saw can be used
as a miter saw. The reference number 16 denotes a safety cover which is at the position
of covering the saw blade 15 when the main body 11 is at the top dead center and rotated
to expose the saw blade 15 in accordance with lowering of the main body 11.
[0016] The support arm 9 can be tilted with the main body 11 in the right direction (the
lower direction of Fig. 2) on the turntable 7. Fixing the tilted support arm 9 and
the main body 11 by a lever 17 at an arbitrary tilting position provides the saw blade
15 with an angle in the perpendicular direction. With the tilt of the main body 11,
bevel cutting can be conducted with respect to the workpiece on the turntable 7. Moreover,
the turntable 7 can turn in a horizontal direction with the main body 11 when a handle
14 is held down. In accordance with the selected angle of the horizontal turn of the
turntable 7, orthogonal cutting and miter cutting can be conducted. In the orthogonal
cutting, the saw blade 15 is perpendicular to the guide fence 8. On the other hand,
in the miter cutting the saw blade 15 is horizontally slanted from the perpendicular
position.
[0017] The main body 11 can be secured at the bottom dead center as shown in Fig. 3 by means
of a locking mechanism 18 provided between the support arm 9 and the main body 11.
As shown in Fig. 4, by reversing the table 3 with this secured condition of the main
body 11, a table saw mode can be obtained wherein only the saw blade 15 protrudes
above the table 3 on which a workpiece is slid for cutting. In this table saw mode,
the rotating shaft 5 corresponds to the center of rotation of the table 3. Here, L1
is defined as the distance between the center of axle O of the rotating shaft 5 and
the center O1 of the motor 13, and L2 is defined as the distance between the center
of axle O of the rotating shaft 5 and the center 02 of the support shaft 10. Then,
L1 is set to be shorter than L2.
[0018] In the miter saw mode, the rotating shafts 5, 5 of the table 3 are positioned on
the table 3, so that there is a difference in height of the table 3 between at the
first rotating position as shown in Figs. 1-3 (the miter saw mode) and at the second
rotating position as shown in Fig. 4 (the table saw mode). (The table 3 in the table
saw mode is higher.)
[0019] Moreover, in order to allow the table 3 to rotate, an opening 19 is provided at the
center of the base 2 in the longitudinal direction. In the inner lateral edges of
this opening 19, a pair of first stopper rubbers 20, 20 which support the lower surface
of the table 3 at the first rotating position are provided on the front side of the
opening 19. On the other hand, a pair of second stopper rubbers 21, 21 are provided
on the rear side of the opening 19. The second stopper rubbers 21, 21 are positioned
on the table 3 at the first rotating position, and support the lower surface of the
table 3 at the second rotating position.
[0020] With this configuration, the table 3 can be reversed only in the direction where
the front part of the table is flipped up (the direction of an arrow in Fig. 3) in
converting from the miter saw mode to the table saw mode. On the other hand, the table
3 can be reversed only in the direction in which the rear part of the table is flipped
up (the direction of an arrow of Fig. 4) in converting from the table saw mode to
the miter saw mode. It should be noted that the rotating shafts 5, 5 are not positioned
at the center of the table 3 in the longitudinal direction, but instead at a slightly
rearward position in the first rotating position, so that the table 3 does not interfere
with the first stopper rubbers 20, 20 upon conversion from the miter saw mode to the
table saw mode.
[0021] As shown in Fig. 5, in this flip over saw 1, a motor 13 is located adjacent to the
upper side of the rotating shafts 5, 5 of the table 3 with the main body being at
the top dead center in a miter saw mode where the main body 11 is positioned above
the table. In this embodiment, the motor's location adjacent to the upper side of
the rotating shafts 5, 5 is achieved as follows. When the main body is at the top
dead center, the center O1 of the motor 13 is located at the area slightly forward
from the vertical surface S penetrating the center of axle O of the rotating shafts
5, 5 of the table 3. Then, the horizontal distance H between the center O1 and the
vertical surface S is set to be smaller.
[0022] In the flip over saw configured as described above, in the miter saw mode the table
3 is secured by means of a stopper mechanism 6 with the saw blade unit 4 raised as
shown in Figs. 1-3. Then the handle 14 is held to lower the main body 11 in which
the blade saw 15 is rotating, so that a workpiece disposed on the turntable 7 can
be cut, specifically, the bevel cutting by tilting the main body 11 and the miter
cutting by horizontally turning the turntable 7 are achieved.
[0023] Here, because of the location of the motor 13, the center of gravity of the main
body 11 is substantially positioned at the center of the table 3 in the longitudinal
direction (that is, adjacent to the rotating shaft 5). Therefore, the accidental reverse
of the table 3 can be prevented even if the stopper mechanism 6 is released by malfunction
and so on.
[0024] On the other hand, conversion into the table saw mode is conducted as follows. First,
the main body 11 is lowered to the bottom dead center to be secured by the locking
mechanism 18. Then the stopper mechanism 6 is released and the table 3 is turned 180
degrees in the direction where the front part of the table is flipped up until the
table 3 is stopped at the reverse position abutting the second stopper rubbers 21,
21. Likewise, upon conversion into the miter saw mode, the table 3 is turned 180 degrees
in the direction where the rear part of the table is flipped up until the table 3
is stopped at the reverse position abutting the first stopper rubbers 20, 20. In these
reverse operations, the motor 13 of the main body 11 locked at the bottom dead center
is further closer to the rotating shaft 5 in addition to above-described location.
Consequently, the moment of inertia upon reversing becomes smaller, so that the reverse
can be conducted easily with a light pressure.
[0025] As described above, in a flip over saw 1 in the above embodiment, the motor 13 is
located adjacent to the upper side of the center of rotation of the table 3 with the
main body 11 being at the top dead center and positioned above the table. Consequently,
since the table 3 is well-balanced even in the miter saw mode, the table 3 is protected
from reversing even if the stopper mechanism 6 is released by malfunction. As a result,
damage to the table 3 and the main body 11 caused by accidental reverse can be prevented.
In addition, since the center of gravity is closer to the center of rotation, reverse
operation of the table 3 becomes easier, thereby improving operability.
[0026] Moreover, when the main body 11 is at the top dead center in the miter saw mode,
the center of gravity is positioned forward since the motor 13's center O1 is positioned
in front of the table 3's center of rotation O. As a result, the accidental reverse
of the table 3 from the miter saw mode can be prevented more effectively.
[0027] On the other hand, when the main body 11 is at the bottom dead center in the miter
saw mode, the distance between the table 3's rotating center O and the motor 13's
center O1 is shorter than that between the rotating center O and the support shaft
10's center 02. Consequently, the moment of inertia becomes small in reversing the
table 3, so that reverse can be conducted easily with a light pressure. Therefore,
an excellent operability can be achieved upon reverse of the table 3 to convert from
the miter saw mode to the table saw mode.
[0028] It should be noted that the position of the motor may be moved backward from the
rotating shaft, unlike the above-described embodiment wherein the motor is located
in front of the same. Moreover, it is acceptable that the motor's center is positioned
right above the rotating shaft. In addition, arrangement of the motor is not limited
to the lateral sides of the main body, since a flip over saw which is well-balanced
and has an excellent operability upon reversing can be obtained by locating the motor
adjacent to the upper side of the center of rotation even if the motor is provided
in the vertical or longitudinal direction.
[0029] Further, the structure of the flip over saw is not limited to the above embodiments.
The main body capable of tilting to both sides may be applicable to the present invention,
and on the contrary, the structure excluding bevel cutting or miter cutting may also
be applicable.
[0030] It is explicitly stated that all features disclosed in the description and/or the
claims are intended to be disclosed separately and independently from each other for
the purpose of original disclosure as well as for the purpose of restricting the claimed
invention independent of the composition of the features in the embodiments and/or
the claims. It is explicitly stated that all value ranges or indications of groups
of entities disclose every possible intermediate value or intermediate entity for
the purpose of original disclosure as well as for the purpose of restricting the claimed
invention, in particular as limits of value ranges.
1. A flip over saw comprising:
a base (2);
a horizontal table (3) supported on the base (2) rotatable 180 degrees;
a main body (11) supported by a support arm (9) provided on one side of the table
(3) and having a saw blade (4) driven to rotate by a motor (13), and
a locking mechanism (18) provided between the main body (11) and the support arm (9),
being able to lock the main body (11) at the bottom dead center in which the saw blade
(4) penetrates the table (3),
wherein the flip over saw can be used as a miter saw in which the saw blade (4) cuts
a workpiece on the table (3) by lowering the main body (11) when the table (3) is
at the first rotating position where the main body (11) is positioned above the table(3),
and wherein the flip over saw can be used as a table saw in which a workpiece is slid
with respect to the saw blade (4) protruding upwardly while penetrating the table
(3) when the table (3) is at the second rotating position where the main body (11)
locked at the bottom dead center by the locking mechanism (18) is positioned below
the table (3),
characterized in that the motor (13) is located right above the center of rotation (5) of the table (3)
or adjacent thereto with the main body (11) being at the top dead center when the
table (3) is positioned at the first rotating position.
2. A flip over saw according to Claim 1, characterized in that the table (3) is reversed in the direction in which the front part of the table (3)
is flipped up in reversing from the first rotating position to the second rotating
position.
3. A flip over saw according to Claim 1 or 2, characterized in that the center of the motor (13) is positioned in front of the center of rotation (5)
of the table (3) with the main body (11) being at the top dead center when the table
(3) is positioned at the first rotating position.
4. A flip over saw according to one of Claims 1 to 3, characterized in that the main body (11) is held movable up and down by a support shaft (10) provided with
a support arm (9) standing on the table (3).
5. A flip over saw according to Claim 4, characterized in that the distance between the center of rotation (5) of the table (3) and the center of
the motor (13) is shorter than that between the center of rotation (5) of the table
(3) and the center of the support shaft (10) with the main body (11) being at a bottom
dead center when the table (3) is positioned at the first rotating position.
6. A flip over saw according to one of Claims 1 to 5, characterized in that the motor (13) is located on one side of the saw blade (4) positioned on the upper
side of the main body (11).
7. A flip over saw according to one of Claims 1 to 6, characterized in that the center of rotation (5) of the table (3) is positioned rearward when the table
(3) is at the first rotating position, wherein at the first rotating position the
table (3) is supported by a first stopper (20) protruding into the lateral inner surfaces
at the front of an opening (19) of the base (2), and wherein at the second rotating
position the table (3) is supported by a second stopper (21) protruding into the lateral
inner surfaces at the rear of the opening (19) of the base (2).
8. A flip over saw according to Claim 7, characterized in that the center of rotation (5) of the table (3) is positioned on the table (3) at the
first rotating position, so that the table (3) at the second rotating position is
higher than that at the first rotating position.
9. A flip over saw according to one of Claims 1 to 8, characterized in that a biasing means which urges the main body (11) to the top dead center is provided.
10. A flip over saw according to one of Claims 1 to 9, characterized in that the table (3) has a turntable (7) which can turn horizontally and on which the main
body (11) is provided, whereby miter cutting is conducted in accordance with the selected
angle of the horizontal turn of the turntable (7) when the flip over saw is used as
a miter saw.
11. A flip over saw according to one of Claims 1 to 10, characterized in that the main body (11) can be tilted to right and left sides and fixed at an arbitrary
tilting position by a lever (17), whereby bevel cutting is conducted in accordance
with the selected angle perpendicular to the saw blade (4) when the flip over saw
is used as a miter saw.
12. A flip over saw according to Claim 10 or 11, characterized in that on the table (3) a guide fence (8) parallel to the rotating shaft (5) of the table
(3) is provided so as to transverse on the turntable (7).
13. A flip over saw according to one of Claims 1 to 12, characterized in that the main body (11) is provided with a handle (14) by which the main body (11) is
moved up and down on the side where the motor (13) is provided.