JP3553267B2 - Tabletop circular saw machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tabletop circular saw, and more particularly to a tabletop circular saw equipped with a device for locking a circular sawing machine body at a top dead center position so as not to tilt and locking a safety cover at the position so as not to rotate. About the board.
[0002]
[Prior art]
Generally, this type of tabletop circular saw machine mainly includes a base and a circular saw body mounted to be vertically tiltable with respect to the base, and the circular saw blade is rotated on the circular saw body. A drive motor to be driven, a blade case partially covering the circular saw blade, a cover position for covering the circular saw blade exposed from the blade case, and a safety cover movable to an exposed position for exposing the circular saw blade. ing. Such a tabletop circular sawing machine is provided with operating means for rotating the safety cover from the cover position to the circular sawing blade to the exposed position as the circular sawing machine body descends from its top dead center position. As an operation means, for example, those using the gravity of a safety cover or using various link mechanisms linked to the movement of a circular saw main body are known.
Further, in these tabletop circular sawing machines, for example, as disclosed in Japanese Patent Laid-Open No. 5-104504, a lock device for holding the circular sawing machine body at the top dead center position when the circular sawing machine is not used, and It has been proposed to provide a lock device for maintaining the cover state of the circular saw blade with the safety cover at the position. This lock device is provided with a lever interlocked with a trigger provided on a straight handle of the circular saw machine body, and a lock plate interlocked with the lever on the handle side via a rod is interlocked with the tilt of the circular saw machine body. The safety cover is provided on the operating link side for rotating the circular saw blade from the cover position to the exposed position, and the lever is provided on the safety cover on the handle side of the circular saw machine body (rotation direction for exposing the circular saw blade). The lock plate is provided with a lock pin which is engaged with and disengaged from the operation link, and the operation of the operation link is restrained so that the top dead center position of the circular saw body can be set. The safety cover is held, and the rotation of the safety cover is locked (blocked) by the contact between the stopper portion and the safety cover.
[0003]
[Problems to be solved by the invention]
In the above configuration, the lever provided with the stopper portion for locking (preventing) the rotation of the safety cover is provided at a portion of the safety cover on the handle side of the circular sawing machine body (a rotation for exposing the circular saw blade). (The one end on the moving direction side), and in the case of a straight handle of a type in which the length of the grip portion (handle) is not relatively restricted, the relative position with respect to the lever is taken into consideration. By extending the lever together with the actual gripping portion, the locking operation, the turning operation of the safety cover, and the gripping operation of the handle can be performed without any trouble. In the case of a so-called D-shaped handle integrally formed in a gear housing or the like of the panel body, the protruding length of the grip portion (pattern) is restricted, so that it cannot be unnecessarily lengthened. Compatible with the handle If the lever is shortened as much as possible, the locking operation, the turning operation of the safety cover, and the gripping operation of the handle, etc., are hindered due to the space and other problems. However, it is difficult to cope with the lock device.
In view of the above-mentioned conventional problems, the present invention locks the circular saw machine body at the top dead center position and secures the safety cover at that position without considering the relative position of the circular saw machine body to the handle. An object of the present invention is to provide a tabletop circular saw capable of performing a lock operation (rotation prevention).
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problems of the prior art, the invention of claim 1 comprises a base on which a workpiece is placed, and a circular saw main body mounted so as to be vertically tiltable with respect to the base. ,
The circular saw machine body includes a handle provided on the tip end side of the circular saw machine body, a drive motor that rotates the circular saw blade, a blade case that partially covers the circular saw blade, and a blade case that is exposed from the blade case. A safety cover movable to a cover position for covering the circular saw blade to be exposed and an exposure position for exposing the circular saw blade, and a tiltably mounted with respect to the base so as to be downward from a top dead center position of the circular saw body. An operating link for moving the safety cover from the cover position to the exposed position with respect to the circular saw blade with tilting to the table circular saw machine,
The circular saw machine body is disposed near a grip portion of the handle, and a lock device that locks a tilting operation at a top dead center position of the circular saw machine body and locks a movement operation of the safety cover at the position. An operating lever for unlocking the lock device.
The lock device includes a lock plate disposed on the tilting base end side of the circular sawing machine main body, the lock plate engages with the operation link to restrict the movement thereof, and a tilting base of the safety cover. A lock piece that is engaged with the end side and regulates the movement thereof, wherein the movement of the lock plate is remotely controlled by the operation lever to perform the tilting operation of the circular sawing machine body and the unlocking of the safety cover. And the lock plate is urged toward the safety cover by elasticity applying means to always maintain the engagement state between the operation link and the lock pin and the engagement state between the safety cover and the lock piece. It is a feature.
[0005]
According to the present invention, the locking of the tilting operation and the locking of the movement of the safety cover at the top dead center position of the circular sawing machine body are performed by the locking device provided at a position close to the base side in a concentrated manner. In addition, the lock release operation can be performed by an operation lever extending near the grip of the handle.
[0006]
According to a second aspect of the present invention, in the tabletop circular saw machine according to the first aspect, the lock device is disposed on a side surface of a handle of the blade case, and the operation lever is disposed between the blade case and the handle. The lever is characterized in that one end is connected to the locking device and the other end is positioned to extend along the side surface of the handle of the handle .
[0007]
According to the present invention, the lock of the tilting operation and the lock of the movement of the safety cover at the top dead center position of the circular sawing machine body, and the unlocking operation thereof are performed by the operation lever extended along the side surface of the grip portion of the handle. It can be carried out.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings. A tabletop circular saw 1 entirely shown in front and rear views in FIGS. 1 and 2 includes a base 2 on which a work (not shown) is placed, A turn base 3 mounted on the base 2 so as to be horizontally rotatable; a substantially hook-shaped mounting arm 4 mounted on the base 2 so as to be tiltable in the left-right direction with reference to a vertical position with respect to the turn base 3; The arm 4 includes a circular saw body 5 provided at an upper end portion of the arm 4 so as to be tiltable in a vertical direction facing the base. Thereby, the circular sawing machine main body 5 can be tilted in the left-right direction with respect to the turn base 3 via the mounting arm 4 with reference to the vertical position.
[0009]
As shown in FIG. 3, the circular saw body 5 has a motor housing 7 containing a motor 6, a gear housing 10 containing a reduction gear 9 meshing with a motor shaft 8 of the motor 6, and an output shaft 11 of the reduction gear 9. A blade case 13 for accommodating the circular saw blade 12 which is exchangeably mounted, and a connecting portion 13a (see FIGS. 1 and 2) for connecting the mounting arm 4 provided on the blade case 13 are provided. Incidentally, the motor 6 is arranged in an upwardly inclined state of 45 ° with respect to the circular saw blade 12.
[0010]
On a part of the outer periphery of the motor housing 7, an operation handle 14 for tilting the circular saw machine body 5 in the vertical and horizontal directions is located. Are formed substantially in a D-shape in a direction perpendicular to the axis of the motor housing 7 and both ends thereof are integrally formed with the motor housing 7. A trigger 15 for operating a switch (not shown) for starting and stopping the motor 6 is provided inside the grip portion 14a of the operating handle 14, and the trigger 15 is provided on the outside (upper surface). A push button 16 is provided for blocking and canceling the retraction operation.
The connecting portion 13a on the blade case 13 side is rotatably connected to the mounting arm 4 via a support shaft 17, and the operation of the operating handle 14 causes the circular saw body 5 to rotate around the support shaft 17. It can be tilted up and down. Further, a spring (not shown) for constantly urging the circular saw machine body 5 upward is interposed between the mounting arm 4 and the connecting portion 13a.
[0011]
As shown in FIG. 3, an opening 13b is formed in a portion of the blade case 13 facing the center of the circular saw blade 12, and a mounting plate 19 for mounting a safety cover 18 is mounted on the opening 13b. One end of the mounting plate 19 is tiltably supported by the support screw 20 with respect to the blade case 13, and the other end is removably fastened to the blade case 13 by a fixing bolt 21.
[0012]
A cap 22 is rotatably fitted into an opening 19 a provided at the center of the mounting plate 19, and the cap 22 is provided with a portion of the circular saw blade 12 exposed from the blade case 13. A substantially fan-shaped safety cover 18 is secured by screws 23 to cover from outside. The safety cover 18 is urged in a clockwise direction (return direction) in FIG. 1 by a spiral spring (not shown) having one end fixed to the mounting plate 19 and the other end fixed to the safety cover 18. Usually, the portion of the circular saw blade 12 exposed from the cover is covered.
[0013]
A control contact plate 25 is provided on the rear surface of the cap 22 with which one end of an operation link 24 for controlling the rotation of the cap 22 abuts. The operation link 24 is, as shown in FIG. 1 or FIG. The end is tiltably connected via a support pin 27 to the upper end of a bracket 26 attached to the lower part of the mounting arm 4. An arc-shaped control slot 28 is formed at the center of the operation link 24 in the longitudinal direction of the operation link 24, and a roller pin 29 attached to the blade case 13 is fitted into the control slot 28. are doing. The radius of curvature of the circular arc portion on one side of the control elongated hole 28 is set smaller than that of the circular arc portion on the other side. The operating link 24 is tilted by the control of the roller pin 29 fitted in the control slot 28 with the downward tilting of the circular saw body 5, and is brought into contact with the control plate 25 of the cap 22. One end rotates the safety cover 18 together with the cap 22 counterclockwise in FIG. 1 against the urging force of the spring to expose the circular saw blade 12.
[0014]
On the back side of the circular sawing machine body 5, the circular sawing machine body 5 is placed at the top dead center position shown in FIGS. 1, 2 and 4, that is, as shown in FIG. A lock device 30 is provided for keeping the lock device 30 at a position fitted to the upper end of the lock device 28.
[0015]
As shown in FIGS. 2, 4, 5, and 6, the lock device 30 has a receiving portion swelled from the blade case 13 on the back surface of the blade case 13 to the side of the gear housing 10 in an oblique vertical direction. A rod 32 rotatably supported by the first and third rods 31, a lock plate 33 extending along the lower portion of the blade case 13 at the lower end of the rod 32, and the gear housing 10 at the upper end of the rod 32; And an operation lever 34 extending to the operation handle 14 from above.
[0016]
The lock plate 33 is formed in a flat plate shape along the lower side surface of the blade case 13, one end of which is fixedly fastened to the lower end of the rod 32 by a screw 32 a, and the other end of which is attached to the operation link 24. A ball-shaped hole 33a is formed opposite to the side surface on the side of the arm 4, and a lock pin 35 projects perpendicularly to the operation link 24 at the small diameter portion of the ball-shaped hole 33a. I have. The lock pin 35 is detachably opposed to lock holes 36 and 37 opened in the operation link 24 and a part of the blade case 13 at the top dead center position of the circular saw body 5. Further, by inserting the lock pin 35 into the two lock holes 37 and 41 at both ends of the blade case 13, when the handle is inadvertently applied (operated) to the handle 14 in the locked state, 35 prevents bending beforehand.
[0017]
In the vicinity of the inside of the ball-shaped hole 33a of the lock plate 33, a lock piece 38 facing the end of the safety cover 18 on the base 2 side (one end in the rotating direction that covers the circular saw blade) is provided. They are integrally protruded in an orthogonal state. The lock piece 38 has an end formed in a hook shape, and an end on the base 2 side of the safety cover 18 at the top dead center position of the circular saw body 5 (a rotating direction for covering the circular saw blade). (At one end on the side). Note that a part of the hook-like portion at the end of the lock piece 38 is opposed to the side surface of the safety cover 18 so as to be able to abut.
[0018]
An end portion of the lock plate 33, that is, an end portion fastened and fixed to the rod 32 is formed with a cut-and-raised portion 33b toward the blade case 13, and the lock plate 33 and the blade at the cut-and-raised portion 33b are formed. A compression spring 40 is elastically mounted between the case 13 and the lock plate 33. The lock pin 35 always engages with the operation link 24 and the lock holes 36 and 37 of the blade case 13 to lock the lock plate 33. The piece 38 is urged in a direction to engage with the lock hole 39 of the safety cover 18. A part of the hook-like portion at the end of the lock piece 38 is always pressed against the side surface of the safety cover 18 by the urging force of the compression spring 40.
[0019]
The operation lever 34 is formed in a flat plate shape having a substantially U-shape in front, and the other end is fixedly fastened to the upper end of the rod 32 by a screw 32a. It faces toward the operation handle 14 and straddles the inside of the space for the grip portion 14 a of the operation handle 14, faces the opposite side to the blade case 13, and bends the end along the side surface of the grip portion 14 a. The portion 34a is formed so as to extend and face the side surface of the grip portion 14a. Thus, the bent portion 34a of the operation lever 34 is always urged by the urging force of the compression spring 40 via the rod 32 in a direction away from the side surface of the grip portion 14a.
[0020]
Next, the operation of the tabletop circular sawing machine 1 configured as described above will be described. First, in a state where the circular sawing machine main body 5 is located at the top dead center position shown in FIGS. 1 and 2, as shown in FIG. The lock pin 35 of the lock plate 33 is engaged (engaged) with the operation link 24 and the lock holes 36, 37, 41 of the blade case 13 by the urging force of the compression spring 40, thereby tilting the operation link 24. Is restricted, and the so-called tilting downward from the top dead center position of the circular saw machine body 5 in which the circular saw machine body 5 is held at the top dead center position is locked.
[0021]
A part of the hook-shaped portion of the lock plate 33 at the end of the lock piece 38 in the lock plate 33 is engaged with the lock hole 39 of the safety cover 18 to expose the circular saw blade 12 of the safety cover 18. The rotation in the direction in which it is performed is prevented (locked state). In this state, due to the urging force of the compression spring 40, a part of the hook-like portion at the end of the lock piece 38 is always in contact with the side surface of the safety cover 18 in a pressed state. "Tapping" is prevented.
[0022]
Next, as shown by the phantom line in FIG. 5, the operation lever 34 is moved toward the side surface of the grip portion 14 a against the compression spring 40 (the rod 32) as the operation handle 14 is gripped by the grip portion 14 a. , The rod 32 is rotated in the moving direction, whereby the lock plate 33 itself moves away from the side surface of the safety cover 18 as shown in FIG. The lock pin 35 is disengaged (unlocked) from the operating link 24 and the lock holes 36 and 37 of the blade case 13, and at the same time, a part of the hook-like portion at the end of the lock piece 38 is removed. It is detached (unlocked) from the lock hole 39 of the safety cover 18. In this state, the circular sawing machine body 5 is tilted downward by gripping the operating handle 14, and the safety cover 18 is rotated in the direction in which the circular saw blade 12 is exposed (see arrow A in FIG. 2). (Rotation in the opposite direction) is possible. In this case, a finger holding the grip portion 14a of the operating handle 14 prevents the pull-in operation of the trigger 15 provided on the operating handle 14 and can operate the push button 16 for releasing the inhibition as it is. is there.
[0023]
In this state, when the circular saw machine main body 5 is tilted downward by grasping the operation handle 14, the operation link 24 is moved by the movement of the engagement position of the roller pin 29 to the control slot 28 with the tilting. By tilting, the safety cover 18 rotates in the direction of arrow A in FIG. 2 via the control abutment plate 25 to expose the circular saw blade 12.
When the trigger 15 is pressed, the motor 6 is started, and the work of cutting the work can be performed by the circular saw blade 12.
[0024]
Next, when the downward movement with respect to the circular saw machine main body 5 is stopped with the end of the work of cutting the work, the circular saw machine main body 5 returns to the top dead center position by a spring (not shown). When the finger (hand) is released from the operation lever 34 in the state of reaching the top dead center position, the operation lever 34 is returned to the original state by the urging force of the compression spring 40, and the operation of the compression spring 40 is stopped. The urging force causes the lock pin 35 of the lock plate 33 to be re-engaged (engaged) with the operation link 24 and the lock holes 36, 37, 41 of the blade case 13, whereby the tilting of the operation link 24 is restricted. The circular saw machine body 5 is held at the top dead center position, that is, the so-called tilting of the circular saw machine body 5 downward from the top dead center position is locked. At the same time, a part of the hook-shaped portion of the lock plate 33 at the end of the lock piece 38 is re-engaged with the lock hole 39 of the safety cover 18 so that the circular saw blade 12 of the safety cover 18 is exposed. The rotation is blocked (locked) as described above.
[0025]
When the finger (hand) is released from the operation lever 34 during the work of cutting the work, that is, during the downward movement with respect to the circular saw body 5, the operation lever 34 returns to the original state by the urging force of the compression spring 40. At the same time, the urging force of the compression spring 40 causes the lock pin 35 of the lock plate 33 to be always in contact with the side surface of the operation link 24, and is returned to the top dead center position of the circular saw machine body 5. It is possible to automatically return the lock pin 35 to a state in which the lock pin 35 is re-engaged (engaged) with the lock holes 36, 37, and 41 of the blade case 13. In this case, the tilting of the operation link 24 is not hindered.
[0026]
【The invention's effect】
In the tabletop circular sawing machine of the present invention, regardless of the relative position between the operating lever and the grip portion of the handle, the circular sawing machine body is tilted at the top dead center position by the locking device installed near the base side. The locking of the operation and the locking of the moving operation of the safety cover can be performed by being concentrated on one member, and the unlocking operation can be performed.
[0027]
In addition, the operation lever extended along the side surface of the blade case is moved to the side surface of the grip portion of the handle to lock the tilting operation at the top dead center position of the circular saw machine body and lock the movement operation of the safety cover. The lock release operation can be performed. For example, the operation of a push button or the like for preventing the pull-in operation of the trigger provided on the operation handle by a finger gripping the grip portion of the operation handle and releasing the inhibition can be performed. It can be made possible as it is.
[Brief description of the drawings]
FIG. 1 is a front view of a tabletop circular saw machine according to an embodiment of the present invention.
FIG. 2 is a rear view of FIG.
FIG. 3 is a sectional view taken along line AA of FIG. 1;
FIG. 4 is an enlarged view of a main part of FIG. 2;
FIG. 5 is an enlarged view of the operation lever shown in FIG.
FIG. 6 is an enlarged view of the lock plate shown in FIG. 2 as viewed from the bottom.
[Explanation of symbols]
Reference Signs List 1 desktop circular saw machine 2 base 3 turn base 5 circular saw machine body 6 motor 12 circular saw blade 13 blade case 14 operating handle 18 safety cover 24 operating link 30 locking device 32 rod 33 lock plate 34 operating lever 35 lock pin 36 Lock hole 37 Lock hole 38 Lock piece 39 Lock hole 40 Compression spring 41 Lock hole

Claims (2)

It comprises a base on which the workpiece is placed, and a circular saw body mounted to be tiltable in the vertical direction with respect to the base,
The circular saw machine body includes a handle provided on the tip end side of the circular saw machine body, a drive motor that rotates the circular saw blade, a blade case that partially covers the circular saw blade, and a blade case that is exposed from the blade case. A safety cover movable to a cover position for covering the circular saw blade to be exposed and an exposure position for exposing the circular saw blade, and a tiltably mounted with respect to the base so as to be downward from a top dead center position of the circular saw body. An operating link for moving the safety cover from the cover position to the exposed position with respect to the circular saw blade with tilting to the table circular saw machine,
The circular saw machine body is disposed near a grip portion of the handle, and a lock device that locks a tilting operation at a top dead center position of the circular saw machine body and locks a movement operation of the safety cover at the position. An operating lever for unlocking the lock device.
The lock device includes a lock plate disposed on the tilting base end side of the circular sawing machine main body, the lock plate engages with the operation link to restrict the movement thereof, and a tilting base of the safety cover. A lock piece that is engaged with the end side and regulates the movement thereof, wherein the movement of the lock plate is remotely controlled by the operation lever to perform the tilting operation of the circular sawing machine body and the unlocking of the safety cover. And the lock plate is urged toward the safety cover by elasticity applying means to always maintain the engagement state between the operation link and the lock pin and the engagement state between the safety cover and the lock piece. The tabletop circular saw machine that is the feature. The tabletop circular saw machine according to claim 1, wherein the locking device is disposed on a side surface of a handle of a blade case, and the operation lever is disposed between the blade case and the handle. A tabletop circular saw machine, which is connected to the lock device and has the other end extending along the side surface of the grip portion of the handle .

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