JPH09300309A - Tabletop circular sawing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to lock and unlock the main body of a circular sawing machine and a safety cover by positioning an operating member connected functionally to a locking means for the tilt operation of the main body of the circular sawing machine and the transfer operation of the safety cover near the grip part of a handle and enabling the release of a locked state. SOLUTION: If an operating lever 34 is transferred to the lateral face side of the grip part 14a of an operating handle 14 resisting a compression spring together with the holding of the grip part 14a, a rod 32 is rotated in the transfer direction of the operating lever 14. Consequently, a lock plate 33 itself is transferred in the direction in which it is separated from a safety cover 18, and a lock pin 35 is detached from lock holes in an activating link and a blade case 13. At the same time, part of a hook-like area on the end part of a locking piece 38 is detached from a lock hole 39 in the safety cover 18. Under this state, the main body of the circular sawing machine tilts downward and the safety cover 18 is rotated into the direction in which the circular saw blade 12 is exposed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a table-top circular saw machine, in particular, a circular saw machine main body, which is locked so as not to tilt at a top dead center position, and a safety cover at that position is locked so as not to rotate. A table-top circular saw equipped with a device.

[0002]

2. Description of the Related Art Generally, a table-top circular saw machine of this type is mainly composed of a base and a circular saw machine body which is vertically tiltable with respect to the base. A drive motor that rotationally drives the circular saw blade, a blade case that partially covers the circular saw blade, a cover position that covers the circular saw blade exposed from the blade case, and a safety cover that can be moved to an exposed position that exposes the circular saw blade. It is configured with. In such a tabletop circular saw, a safety cover is provided with an operating means for rotating the safety cover from the cover position to the exposed position with respect to the circular saw blade as the circular saw body lowers from the top dead center position. Has been proposed, and as its operating means, for example, one utilizing the gravity of the safety cover or utilizing various link mechanisms interlocking with the movement of the circular saw machine main body is known. Further, in these table-top circular saw machines, for example, as shown in Japanese Patent Laid-Open No. 5-104504, a lock device for holding the circular saw machine body at the top dead center position when the circular saw machine is not used, and It has been proposed that each is provided with a locking device that keeps the circular saw blade covered by the safety cover in position. This locking device is provided with a lever that interlocks with a rigger provided on a straight handle of the circular saw machine body, and a lock plate that interlocks with the lever on the handle side via a rod interlocks with the tilting of the circular saw machine body. And a safety cover is provided on the operation link side for rotating the circular saw blade from the cover position to the exposed position, and the lever is provided with a portion of the safety cover on the handle side of the circular saw blade (rotating direction for exposing the circular saw blade. The lock plate is provided with a stopper portion that engages and disengages with the operating link, and the operation of the operating link is restricted so that the position of the top dead center of the circular saw machine can be adjusted. The safety cover is held, and the rotation of the safety cover is locked (blocked) by contact between the stopper portion and the safety cover.

[0003]

In the above-mentioned structure, the lever provided with the stopper portion for locking (preventing) the rotation of the safety cover is provided on the handle side of the circular saw body of the safety cover. In the case of a straight handle of a type in which the length of the grip (handle) is relatively unconstrained, it is provided on the part (one end on the rotating direction side to expose the circular saw blade) and the lever. Considering the relative position of the lever, lengthen the lever along with the actual grip of the handle,
The lock operation, the rotation operation of the safety cover, and the gripping operation of the handle can be handled without any hindrance, but both ends are formed integrally with the gear housing of the circular saw machine body. In the case of a so-called D type handle,
Since the protruding length of the grip portion (handle) is restricted, it cannot be unnecessarily lengthened, and if the lever is shortened to accommodate the handle, the above-mentioned problem will occur due to the space and the like. This is also a factor that hinders the locking operation, the rotation operation of the safety cover, the gripping operation of the handle, and the like, so that it is difficult for the locking device having the above structure to deal with the problem. Therefore, in view of the above-mentioned conventional problems, the present invention locks the circular saw machine body at the top dead center position without considering the relative position to the handle of the circular saw machine body and the safety cover at the position. (EN) A table-top circular saw machine that can be operated to lock (rotate).

[0004]

In order to solve the above-mentioned problems of the prior art, the invention of claim 1 provides a base on which a workpiece is placed, and a tiltable device in the up-down direction with respect to the base. The main body of the circular saw machine is a handle for tilting the circular saw machine body in the vertical direction, a drive motor for rotating the circular saw blade, and the circular saw blade partially. A blade case, a safety cover that is movable to a cover position that covers the circular saw blade exposed from the blade case, and an exposed position that exposes the circular saw blade, and a tiltable installation with respect to the base. A tabletop circular saw machine comprising: an operating link that moves the safety cover from a cover position to an exposed position with respect to a circular saw blade with tilting downward from a top dead center position of the circular saw machine body. The tilting motion at the top dead center of the circular saw body is And a locking means for locking the movement of the safety cover at that position are installed at a position close to the base side, and an operating member linked to the locking means is provided near the grip of the handle. It is characterized in that it is arranged in the extended position so that the unlocking operation of the locking means is possible.

According to the present invention, the locking means installed near the base side can lock the tilting motion and the moving motion of the safety cover at the top dead center position of the circular saw body. Further, the unlocking operation can be performed by the operation member extending near the grip portion of the handle.

According to a second aspect of the present invention, in the tabletop circular saw machine according to the first aspect, the locking means is disposed on a side surface of the handle of the blade case, and the operating member is disposed between the blade case and the handle. The operating member is characterized in that one end thereof is connected to the locking means, and the other end thereof is located along the side surface opposite to the blade case across the grip portion of the handle. It is a thing.

According to the present invention, the tilting operation is locked at the top dead center position of the circular saw machine body by the operation member, which extends over the grip portion of the handle and extends along the side surface opposite to the blade case. The movement of the safety cover can be locked and unlocked.

According to a third aspect of the present invention, in the tabletop circular saw machine according to the first or second aspect, the lock means is close to the base with respect to the lock member that engages and disengages with the operation link and the safety cover. And a lock member that engages and disengages at a fixed position, so that the tilting operation lock and the safety cover movement operation at the top dead center position of the circular saw body and the locking operation thereof are performed at the same time. It is what

According to the present invention, both the lock means on the main body side of the circular saw machine and the lock means on the safety cover side can be compactly constructed.

According to a fourth aspect of the present invention, in the tabletop circular saw machine according to the first, second or third aspect, the locking means is always biased in the locking operation direction by the elastic force applying means and at least with respect to the safety cover. It is characterized in that the locking member to be engaged and disengaged is configured to be press-engaged with the safety cover.

According to the present invention, the safety cover can be locked without causing rattling.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will now be described with reference to the drawings. A table-top circular saw machine 1 shown in front and rear views in FIGS. A base 2 to be placed, a turn base 3 rotatably mounted on the base 2, and a substantially hook-shaped member mounted so as to be tiltable in the left-right direction with respect to a vertical position with respect to the turn base 3. It is composed of a mounting arm 4 and a circular saw body 5 mounted on the mounting arm 4 at an upper end portion thereof so as to be tiltable in the vertical direction facing the base. As a result, the circular saw body 5 can be tilted in the left-right direction with respect to the turn base 3 via the mounting arm 4 with respect to the vertical position.

As shown in FIG. 3, the circular saw body 5 includes a motor housing 7 containing a motor 6 and a gear housing 1 containing a reduction gear 9 meshing with a motor shaft 8 of the motor 6.
0, a blade case 13 for accommodating a circular saw blade 12 that is replaceably attached to the output shaft 11 of the reduction gear 9, and a connecting portion 13a with a mounting arm 4 provided in the blade case 13 (see FIGS. 1 and 2). 2)). The motor 6 is arranged in a state of being inclined upward at 45 ° with respect to the circular saw blade 12.

On a part of the outer periphery of the motor housing 7, an operating handle 14 for tilting the circular saw body 5 in the up-down direction and the left-right direction is located. Both ends of the motor 6 in a direction orthogonal to the axial center of the motor 6 are formed in a motor housing 7 in a substantially D-shape. 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 handle 14 for operation, and the trigger 15 is provided on the outside (upper surface). A push button 16 is provided for blocking and retracting the retracting 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 circular saw body 5 is rotated around the support shaft 17 by operating the operating handle 14. It is possible to tilt vertically. Further, a spring (not shown) that constantly urges the circular saw body 5 upward is interposed between the mounting arm 4 and the connecting portion 13a.

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 formed in the opening 13b. The mounting plate 19 is supported at one end side so as to be tiltable with respect to the blade case 13 by a support screw 20, and at the other end side so as to be detachably fastened to the blade case 13 with a fixing bolt 21. There is.

Opening 1 provided in the central portion of the mounting plate 19
A cap 22 is rotatably fitted to 9a, and a substantially fan-shaped safety cover 18 for covering the portion of the circular saw blade 12 exposed from the blade case 13 from the outside of the blade case 13 is screwed into the cap 22. It is fixed by 23. The safety cover 18 is urged in the clockwise direction (return rotation direction) in FIG. 2 by a spiral spring (not shown) fixed at one end to the mounting plate 19 and at the other end to the safety cover 18, and the blade case 13 Circular saw blade 12 exposed from
The part that is usually covered.

On the back surface of the cap 22, the cap 22
A control contact plate 25 is provided so as to abut one end of the operating link 24 for controlling the rotation of the operating link 24.
Alternatively, as shown in FIG. 2, the other end is tiltably connected to an upper end of a bracket 26 provided below the mounting arm 4 via a support pin 27. An arcuate control elongated hole 28 is formed in the central portion 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 elongated hole 28. are doing. The radius of curvature of the arcuate portion on one side of the control elongated hole 28 is set smaller than that of the arcuate portion on the other side. Then, the operation link 24 is tilted by the control of the roller pin 29 fitted in the control elongated hole 28 as the circular saw body 5 is tilted downward, and is brought into contact with the control contact plate 25 of the cap 22. With one end, the safety cover 18 together with the cap 22 is rotated counterclockwise in FIG. 2 against the biasing force of the spring to expose the circular saw blade 12.

On the back side of the circular saw machine body 5, the circular saw machine body 5 is located at the top dead center position shown in FIGS. 1, 2 and 4, that is, the roller pin 29 of the operating link 24 as shown in FIG. A lock device 30 is provided to keep the control slot 28 fitted to the upper end thereof.

As shown in FIGS. 2 and 4 and FIGS. 5 and 6, this locking device 30 is bulged from the blade case 13 in the vertical direction diagonally to the side of the housing 10 on the back surface of the blade case 13. A rod 32 rotatably supported by the receiving portions 31, 31, a lock plate 33 extending along the lower portion of the blade case 13 at the lower end portion of the rod 32, and an upper end portion of the rod 32 at the upper end portion The operating lever 34 extends from above the gear housing 10 to the operating handle 14.

The lock plate 33 is the blade case 1
3 is formed in a flat plate shape along the lower side surface, one end of which is fastened and fixed to the lower end of the rod 32 by a screw 32a, and the other end faces the side surface of the actuation link 24 on the side of the mounting arm 4. A daruma-shaped hole portion 33a is formed so as to be positioned, and a lock pin 35 is projectingly provided in an orthogonal state toward the operation link 24 at a small diameter portion of the daruma-shaped hole portion 33a. The lock pin 35 is disengageably opposed to the lock holes 36, 37, 41 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, the lock pin 35 is attached to the two lock holes 37, 41 at both ends of the blade case 13.
By inserting the lock pin 35 in the lock state, the lock pin 35 is prevented from being bent when the handle 14 is inadvertently exerted (acted) on the handle 14.

In addition, the base 2 of the safety cover 18 is provided in the vicinity of the inner side of the sloppy hole 33a of the lock plate 33.
A lock piece 38 that is opposed to an end portion on the side (one end on the rotation direction side that covers the circular saw blade) is integrally projecting in an orthogonal state. The lock piece 38 has a hook-like end portion, and at the top dead center position of the circular saw machine body 5, the end portion of the safety cover 18 on the base 2 side (rotating direction for covering the circular saw blade). The lock hole 39 is formed on one side) so as to be engageable with and disengageable from the lock hole 39. In addition, a part of the hook-shaped portion at the end of the lock piece 38 opposes the side surface of the safety cover 18 so as to be able to contact.

A cut-and-raised portion 33b is formed toward the blade case 13 at one end of the lock plate 33, that is, an end portion which is fastened and fixed to the rod 32, and the lock plate at the cut-and-raised portion 33b is formed. A compression spring 40 is mounted between the blade 33 and the blade case 13, and the lock plate 33 is always attached to the lock pin 3
5 is engaged in the lock holes 36, 37 of the actuation link 24 and the blade case 13, and the lock piece 38 is urged in a direction of being engaged in the lock hole 39 of the safety cover 18.
Due to the urging force of the compression spring 40, a part of the hook-shaped portion at the end of the lock piece 38 is always the safety cover 1.
It is abutted on the side surface of 8 in a pressed state.

The operating lever 34 is formed in a substantially flat plate shape in a front shape, and its other end is fastened and fixed to the upper end of the rod 32 by a screw 32a, and one end of the operating lever 34 is closed. From above to the operation handle 14 and the grip portion 14 of the operation handle 14
It faces the side opposite to the blade case 13 across the inside of the space for a, and the end portion is bent along the side surface of the grip portion 14a so that the portion 34a extends toward the side surface of the grip portion 14a. It is located here. Then, the operation lever 34
The portion 34a formed by bending through the rod 32 by the urging force of the compression spring 40 is always the grip portion 14a.
Is urged away from the side of the.

Next, the operation of the tabletop circular saw machine 1 configured as described above will be described. First, when the circular saw machine body 5 is located at the top dead center position shown in FIGS. As shown, the urging force of the compression spring 40 causes the lock pin 35 of the lock plate 33 to be engaged (engaged) with the operation link 24 and the lock holes 36, 37, 41 of the blade case 13, and thereby the operation link. The tilting of 24 is restricted, and the circular saw body 5 is held at the top dead center position, that is, the tilting downward from the so-called top dead center position of the circular saw machine body 5 is locked.

Further, in the safety cover 18, a part of the hook-shaped portion at the end of the lock piece 38 of the lock plate 33 is engaged with the lock hole 39 of the safety cover 18, and the circular saw blade of the safety cover 18 is provided. Rotation in the direction of exposing 12 is blocked (locked state). In this state, due to the urging force of the compression spring 40, a part of the hook-shaped portion at the end of the lock piece 38 is always abutted against the side surface of the safety cover 18 in a pressed state, and "Tatsuki" is prevented.

Next, the grip portion 14a of the handle 14 for operation
As shown by the phantom line in FIG. 5, the operating lever 34 is resisted against the compression spring 40 and the grip 1
When the rod 32 is moved toward the side surface of 4a (rotation about the rod 32 as a fulcrum), the rod 32 is rotated in the movement direction, which causes the lock plate 33 itself to move toward the safety cover 18 as shown in FIG. The lock pin 35 is moved (rotated about the rod 32 as a fulcrum) in the direction away from the side surface, and the lock pin 35 of the lock pin 3 is locked in the lock hole 3 of the operation link 24 and the blade case 13.
6, 37, 41 are released (unlocked), and at the same time, a part of the hook-shaped portion at the end of the lock piece 38 is removed from the safety cover 18.
The lock hole 39 is released (unlocked). In this state, the handle 14 for operation is gripped and the circular saw body 5 is tilted downward, and the safety cover 18 is accordingly rotated in the exposing direction of the circular saw blade 12 (see arrow A in FIG. 2). Rotation in the opposite direction) is possible. In this case, the operating handle 1
It is possible to operate the push button 16 for preventing and retracting the pulling-in operation of the trigger 15 provided on the operating handle 14 with a finger holding the grip portion 14a of No. 4 as it is.

When the handle 14 for operation is gripped and the main body 5 of the circular saw machine is tilted downward from this state, the roller pin 29 is actuated by the movement of the engaging position of the actuating link 24 of the actuating link 24 with respect to the control elongated hole 28. The link 24 is tilted and the safety cover 18 is rotated in the direction of arrow A in FIG. 2 via the control contact plate 25 to expose the circular saw blade 12. And trigger 1
By pushing in 5, the motor 6 is started and the work of cutting the work can be performed by the circular saw blade 12.

Next, when the downward movement of the circular saw machine body 5 is stopped with the completion of the work of cutting the workpiece, the circular saw machine 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 compression spring 40 Due to the urging force, the lock pin 35 of the lock plate 33 is again engaged (engaged) with the operation link 24 and the lock holes 36, 37, 41 of the blade case 13, whereby the operation link 2
The tilting of No. 4 is restricted and the circular saw body 5 is held at the top dead center position, that is, the tilting downward from the so-called top dead center position of the circular saw machine body 5 is locked. At the same time, a part of the hook-shaped portion of the end of the lock piece 38 of the lock plate 33 is re-engaged in the lock hole 39 of the safety cover 18 to expose the circular saw blade 12 of the safety cover 18. The rotation is blocked (locked) as described above.

When the finger (hand) is released from the operating lever 34 during the work of cutting the work, that is, during the downward movement with respect to the circular saw body 5, the operating lever 34 is returned to its original position by the urging force of the compression spring 40. While returning to the state,
The lock plate 3 is urged by the urging force of the compression spring 40.
The lock pin 35 of No. 3 is always in contact with the side surface of the operating link 24, and as the circular saw body 5 is returned to the top dead center position, the lock pin 35 is locked in the operating link 24 and the blade case 13. It is possible to automatically restore the state of being re-engaged (engaged) with 36, 37, 41. In this case, tilting of the operating link 24 is not hindered.

[0030]

In the tabletop circular saw machine of the present invention, regardless of the relative position between the operating member and the grip portion of the handle, the upper circular saw machine body is provided with the lock means provided at a position close to the base side. It is possible to lock the tilting motion and the moving motion of the safety cover at the dead center position, and also to perform the unlocking motion.

Further, the operation member is arranged to extend along the side surface opposite to the blade case while straddling the grip portion of the handle, and the operation member locks the tilting motion at the top dead center position of the circular saw machine and moves the safety cover. The operation can be locked and unlocked, and, for example, a push button that prevents and retracts the pull-in operation of the trigger provided on the operating handle by the finger holding the grip portion of the operating handle. It is possible to perform operations such as the above as they are.

Further, both the lock means on the side of the circular saw machine and the lock means on the side of the safety cover can be compactly integrated on the mounting arm side.

In addition, the safety cover can be locked without causing rattling.

[Brief description of 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;

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 seen from the bottom surface.

[Explanation of symbols]

 1 Tabletop circular saw machine 2 Base 3 Turn base 5 Circular saw machine body 6 Motor 12 Circular saw blade 13 Blade case 14 Handle for operation 18 Safety cover 24 Actuation link 30 Lock 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 (4)

[Claims] 1. A base on which a material to be processed is placed, and a circular saw machine body mounted so as to be vertically tiltable with respect to the base. The circular saw machine body is mounted on the circular saw machine body. A handle for performing a tilting motion in the up-and-down direction, a drive motor that rotationally drives the circular saw blade, and a blade case that partially covers the circular saw blade,
A safety cover that is movable to a cover position that covers the circular saw blade exposed from the blade case and an exposed position that exposes the circular saw blade, and is mounted tiltably with respect to the base and is provided on the circular saw machine body. A table-top circular saw machine equipped with an operating link for moving the safety cover from a cover position to an exposed position with respect to a circular saw blade when tilted downward from a dead center position, wherein the circular saw machine body has the circular saw machine. Locking means for locking the tilting motion of the main body at the top dead center position and locking the moving motion of the safety cover at the position are installed at a position close to the base side, and the operating member is connected to the locking means. A table-top circular saw machine, characterized in that it is configured to extend in the vicinity of the grip portion of the handle to enable the unlocking operation of the locking means. 2. The locking means is disposed on the side of the handle of the blade case, and the operating member is disposed between the blade case and the handle, and one end of the operating member is connected to the locking means and the other. 2. The table-top circular saw machine according to claim 1, wherein the end portion is located so as to extend across the grip portion of the handle and along the side surface opposite to the blade case. 3. The circular saw body of the circular saw machine body, wherein the locking means includes a locking member that engages and disengages with the operation link and a locking member that engages and disengages with the safety cover at a position close to the base. The tabletop circular saw machine according to claim 1 or 2, wherein the tilting motion lock at the top dead center position, the safety cover movement motion lock and the lock release motion are simultaneously performed. 4. The lock means is always urged in the lock operation direction by the elastic force applying means, and at least a lock member that engages with and disengages from the safety cover is press-engaged with the safety cover. The tabletop circular saw machine according to claim 1, 2 or 3, characterized in that.