JP4970609B2 - Portable cutting machine - Google Patents

Description

  The present invention relates to a battery-powered portable cutting machine.

  This type of portable cutting machine such as an electric saw mainly uses a household power supply, but there is a problem that it cannot be used when the power cable is not close enough because the power cable is attached. It was. Therefore, what is equipped with the battery pack which can be attached or detached as a power supply is provided in the market recently (refer patent documents 1, 2, and 3).

  Such a portable cutting machine has an operating handle at the upper part of a cutting machine body in which a saw blade on a surface plate, a saw cover that covers the saw blade, and an electric motor that drives the saw blade are arranged side by side. Are arranged in the front-rear direction, and a battery pack is detachably provided at the rear lower part of the handle. However, the battery pack, like the electric motor, the saw blade and the saw cover, is a heavy component among the components of the portable cutting machine, so it is provided at a position away from the handle operating portion (trigger lever). Is not preferable in terms of weight balance. The handle operating part is provided at the front part of the grip part of the handle so that it can be operated with the index finger. Even with the same weight, the battery, the electric motor and the saw blade (including the saw cover) can be connected to the handle operating part. The one provided at a position far from the front is longer than the one provided at a position close to the three parts, and is held in the hand when cutting the parts near the right, left, and the like. It is hard to swing around lightly. Thus, it is preferable that the saw blades of the battery and the electric motor are concentrated in a position close to the operation portion of the handle.

  In this regard, at present, the battery shown in Patent Document 1 is closest to the handle operating portion, so that it can be said that this concentrated structure is most advanced.

JP 2008-18498 A JP 2001-293672 A JP 2002-316302 A

  However, even the cutting machine of Patent Document 1 is not always sufficient in terms of good handling. This is because the cutting depth adjusting mechanism of the cutting machine cannot bring the battery pack closer to the electric motor side. That is, a cutting depth adjusting mechanism is provided at the rear part of the cutting machine main body. This adjustment mechanism adjusts the inclination of the surface plate that is rotatably arranged at the bottom of the cutting machine body to adjust the amount of saw blade that is exposed from the lower surface of the surface plate. On the side of the saw blade, an adjustment lever for adjusting the protruding amount of the saw blade is disposed on the side of the electric motor opposite to the saw blade, and the mechanism body and the adjustment lever are connected by a shaft. In the above structure, since the shaft must be provided between the battery pack and the electric motor, the structure shown in Patent Document 1 is the limit, and the battery pack cannot be brought closer to the electric motor any more. The battery pack can be brought closer to the electric motor side (front side) by shortening the shaft and placing the adjustment lever close to the saw blade side, but in that case, there is no space for mounting the adjustment lever. Therefore, the current situation is that the arrangement shown in Patent Document 1 cannot be modified.

  It is an object of the present invention to solve the above-mentioned problems and to provide a portable cutting machine that is small in size, has a good weight balance, and is easy to handle.

In order to solve the above-mentioned problem, the invention according to claim 1 is arranged such that an operation handle is arranged in the front-rear direction on an upper part of a cutting machine body in which a saw cover and a saw cover that covers the saw blade and an electric motor for driving the saw blade are arranged side by side. A battery pack for driving the electric motor is detachably provided at the rear lower part of the handle, and a platen placed on the material to be cut and a saw from the lower surface of the platen are provided at the lower part of the cutting machine body. In a portable cutting machine provided with a cutting depth adjusting mechanism for adjusting the amount of protrusion of the blade, the battery pack is positioned close to the electric motor and offset from the center of the handle to the opposite side of the saw blade. The cutting depth adjusting mechanism includes a rotation shaft that rotatably supports the surface plate on a front portion of the cutting machine body, an arc-shaped link provided on a rear portion of the surface plate, and the cutting Provided on the machine body A clamping body slidable along the link and an adjustment lever for loosening or tightening the clamping body, and the adjustment lever is attached to a shaft parallel to the rotating shaft and The surface plate rotates in a direction rotating with respect to the rotation shaft, and is disposed on a side portion of the battery pack on the saw cover side, and provided at a position where the battery pack is offset. A grip portion of the handle, which is disposed in a space between the battery pack and the saw cover formed in the above-described manner so as to be pivotable downward and upward about the shaft disposed near the front end of the battery pack. the lower, than the saw cover in a side view is formed a space upward, to the saw cover side portion of the battery pack space to the rear than the saw cover formed The adjustment lever extends to the rear side of the saw cover on the side of the battery pack on the side of the saw cover, and the portion of the adjustment lever that extends rearward of the saw cover is the battery pack. In the space on the pack side and the rear side of the saw cover, it is formed to be wide toward the saw cover side .

The invention according to claim 2 is characterized in that, in claim 1 , the shaft is provided in a range from the link to the front of the battery pack.

  According to the present invention, since the battery pack is provided at a position that is offset from the center of the handle to the opposite side of the saw blade near the electric motor, a space can be formed between the saw cover and the battery pack. This can be used as a space for providing an adjustment lever. If the adjustment lever is placed closer to the blade than the battery pack, there will be no obstacle to placing the battery pack close to the rear of the electric motor, so the battery pack directly contacts the electric motor housing. It can arrange | position in the proximity position as much as possible. And since the battery pack, the electric motor and the saw blade (including the saw cover) are intensively arranged in the vicinity of the operation part provided at the front part of the handle, further downsizing can be promoted. it can.

  In addition, the battery pack and the electric motor saw blade are not only concentrated in one place, but the battery pack is located in the vicinity of the electric motor and offset from the center of the handle to the opposite side of the saw blade. Therefore, the right and left weight balance when holding a portable cutting machine is good, and it is stable without tilting to the left or right. Therefore, it is possible to obtain a portable cutting machine that has a good weight balance and is much easier to handle.

  Further, since the adjustment lever of the cutting depth adjustment mechanism is arranged between the battery pack and the saw cover, the adjustment lever can be arranged at the rear position of the cutting machine main body, just like the conventional one. The operator is not confused and the operability is not impaired. In addition, since an accident of hitting another member during the cutting operation is less likely to occur, the malfunction of the cutting depth adjusting mechanism is almost eliminated, and the safety of the work is improved. Furthermore, if the adjustment lever is extended to the rear of the saw cover, the operability is improved.

Plan view of a portable cutting machine according to the present invention Plan view of the portable cutting machine Sectional drawing on the aa line of FIG. Sectional drawing on the bb line of FIG. Sectional drawing on the cc line of FIG. Sectional drawing on the dd line of FIG. Explanatory drawing which shows the action | operation aspect of a cutting depth adjustment mechanism in the cross section on the dd line of FIG.

  In FIG. 1 to FIG. 3, the symbol A indicates a portable cutting machine. In this cutting machine, an operation handle 4 is cut at the upper part of a cutting machine body 3 in which a saw blade (circular saw) 1 and an electric motor 2 for driving the saw blade 1 are arranged side by side. The battery pack 5 for driving the electric motor 2 is detachably provided at the lower part of the rear end 4a of the handle 4 and parallel to the direction, that is, in the front-rear direction. A surface plate 6 to be placed is provided. A cutting depth adjusting mechanism (described later) for adjusting the protruding amount of the saw blade 1 exposed from the lower surface of the surface plate 6 is provided on the cutting machine body 3 and the surface plate 6. Is provided.

  A first reduction gear 10 fixed to one end of the intermediate shaft 8 meshes with the output shaft 7 of the electric motor 2, and a second reduction gear 11 fixed to the other end of the intermediate shaft 8 is fixed to the final shaft 9. 3 is engaged with the reduction gear 12 and the saw blade 1 is fixed to the final shaft 9. Thereby, when the electric motor 2 rotates, the rotational force is transmitted to the final shaft 9 via the first, second, and third reduction gears 10, 11, and 12, and the saw blade 1 rotates.

  The electric motor 2 is housed in a motor housing 13, and a substantially semi-circular portion above the surface plate 6 of the saw blade 1 is covered with a saw cover 14 for ensuring safety. An electric motor cooling fan 15 is also attached to the output shaft 7 of the electric motor 2.

  The surface plate 6 is a metal plate-like member provided in the lower part of the cutting machine body 3, and an opening 16 is formed through a part of the platen 6. The part is exposed and covered with an arc-shaped lower guard 17. The lower guard 17 is mounted so as to be rotatable about a rotation axis (final axis) 9 of the saw blade 1.

  Further, the operation handle 4 is disposed at the upper part of the cutting machine body 3, the front part thereof is integrally provided on the motor housing 13 side of the front part of the cutting machine body 3, the rear part is bent, and the bent end is bent. The portion is integrally provided on the rear surface of the cutting machine body 3. A switch button 18 of the electric motor 2 is arranged as an operation part inside the front part of the grip part of the handle 4. A mounting portion for the battery pack 5 having a known attachment / detachment mechanism is formed between the lower portion of the rear end 4a of the handle 4 and the surface plate 6, and the battery pack 5 can be removed from the rear of the mounting portion by a known means. It can be plugged in and locked, and after unlocking it, it can be pulled out and removed.

  Incidentally, as shown in FIG. 2, the battery pack 5 is disposed in the vicinity of the electric motor 2 and offset from the center of the handle 4 toward the electric motor 2. Accordingly, a space S is formed between the battery pack 5 and the saw cover 14 on the saw blade 1 side.

  Next, the portable cutting machine is provided with a cutting depth adjusting mechanism for adjusting the cutting depth of the material to be cut by variably adjusting the protruding amount of the saw blade 1 from the lower surface of the surface plate 6. Yes. This cutting depth adjusting mechanism includes the space S and is disposed closer to the saw blade 1 than the battery pack 5.

  That is, as shown in FIG. 4, the cutting depth adjusting mechanism rotatably supports the front end portion of the surface plate 6 by the rotation shaft 20 provided at the front portion of the cutting machine body 3, and the surface plate. 6, an arc-shaped link 21 is provided from the rear, and the link 21 is sandwiched between a pair of sandwiching bodies 22 and 23 provided in the cutting machine body 3 as shown in FIG. As shown in FIGS. 6 and 7, the surface plate 6 is rotated and fixed to a desired position around the rotation shaft 20 by loosening or tightening, and the saw blade 1 protrudes from the lower surface of the surface plate 6. The depth of cut of the material to be cut is adjusted by adjusting the amount.

  As shown in FIGS. 4 and 5, a long hole 24 is formed in an arc shape along the longitudinal direction in the center of the link 21, and a shaft 25 provided on the cutting machine main body 3 side is formed in the long hole 24. It penetrates. The shaft 25 further penetrates the inner side wall 14 a of the saw cover 14. The shaft 25 is provided with sandwiching bodies 22 and 23 for sandwiching the link 21 from both the inside and outside. The outer clamping body 22 is slidably provided along a groove 26 formed in the longitudinal direction of the link 21 and is screwed to the shaft 25. The inner clamping body 23 is formed integrally with the shaft 25 and formed integrally with the base portion 27 a of the adjustment lever 27. As a result, as shown in FIGS. 6 and 7, the adjustment lever 27 is rotated downward and upward to bring the outer holding body 22 closer to and away from the inner holding body 23, respectively. It is possible to adjust the protruding amount of the saw blade 1 by rotating the surface plate 6 around the rotation shaft 20 by tightening or loosening the link 21 together with the side wall 14a. .

  According to the above mechanism, the rear part of the surface plate 6 becomes free by rotating the adjustment lever 27 upward as shown in FIG. It can be rotated around the rotation shaft 20, and the amount of protrusion of the saw blade 1 protruding from the lower surface of the surface plate 6 is changed by the rotation. Since the amount of protrusion is the depth of cut, the depth of cut can be adjusted according to the material to be cut. After the adjustment, the surface plate 6 and the cutting machine main body 3 can be fixed at an adjusted angle by rotating the adjustment lever 27 in the reverse direction to operate the clamping bodies 22 and 23 in the tightening direction.

  The shaft 25 extends to the front of the battery pack 5, and the end of the shaft 25 ends in a space S between the battery pack 5 and the saw cover 14. The adjustment lever 27 is disposed in the space S and is operably provided in a shape that wraps around the rear of the saw cover 14.

  As described above, since the battery pack 5 is provided in the vicinity of the electric motor 2 and offset from the center of the handle 4 toward the electric motor 2, a space S is formed between the saw cover 14 and the battery pack 5. Can be used as a space for providing a cutting depth adjusting mechanism. Thus, the shaft 25 constituting the cutting depth adjusting mechanism is not a structure that penetrates the cutting machine body 3 from side to side, but its shaft end is a structure provided on the saw blade 1 side of the battery pack 5; There is nothing that hinders the battery pack 5 from being placed close to the rear of the electric motor 2. For this reason, the battery pack 5 can be disposed at a proximity position where it can directly contact the motor housing 13. Therefore, since the battery pack 5 and the saw blade 1 of the electric motor 2 are arranged in a concentrated manner, the size can be further reduced as compared with the conventional case.

  Further, the battery pack 5 and the saw blade 1 of the electric motor 2 are not only concentratedly arranged near the switch button 18 of the handle 4 but also the battery pack 5 is located near the electric motor 2 from the center of the operation handle 4. Since it is provided at a position offset to the electric motor 2 side, the right and left weight balance when holding the portable cutting machine is good, and it is stable without tilting to the left or right. It is hard to get tired even if you use it. Therefore, it is possible to obtain a portable cutting machine that has a good weight balance and is much easier to handle.

  Furthermore, since the adjustment lever 27 is provided between the battery pack 5 and the saw blade 1 so as to wrap around the back of the saw cover 14, the operability of the adjustment lever 27 can be improved, and other members can be used during the cutting operation. Since the accident of hitting is less likely to occur, there is almost no malfunction of the cutting depth adjusting mechanism, and the safety of the work is improved.

  The cut depth adjusting mechanism may be any mechanism that can tighten and loosen the link 21 and is not limited to the above-described form. For example, instead of providing the adjustment lever 27 integrally with the sandwiching bodies 22 and 23, a structure in which the adjustment lever 27 is provided integrally with the shaft and the shaft is rotated by the adjustment lever 27 may be employed.

  Further, when the adjustment lever 27 is provided not at the position between the battery pack 5 and the saw blade 1 but at the rear portion of the saw cover 14, the battery pack 5 and the handle 4 are moved toward the saw blade 1 by the space of the adjustment lever 27. Can be arranged.

DESCRIPTION OF SYMBOLS 1 Saw blade 2 Electric motor 3 Cutting machine main body 4 Operation handle 5 Battery pack 6 Surface plate 14 Saw cover 27 Adjustment lever

Claims (2)

An operation handle is arranged in the front-rear direction on the upper part of the main body of the cutting machine with a saw cover and a saw cover covering the saw blade and an electric motor for driving the saw blade, and a battery pack for driving the electric motor is attached to the rear lower part of the handle At the bottom of the main body of the cutting machine, a surface plate placed on the material to be cut and a cutting depth adjusting mechanism for adjusting the protruding amount of the saw blade from the lower surface of the surface plate are provided. Portable cutting machine
Providing the battery pack close to the electric motor and offset from the center of the handle to the opposite side of the saw blade;
The cutting depth adjusting mechanism includes a rotating shaft that rotatably supports the surface plate on a front portion of the cutting machine body, an arc-shaped link provided at a rear portion of the surface plate, and the cutting machine body. A holding body that is slidable along the link, and an adjustment lever for loosening or tightening the clamping body,
The adjusting lever is attached to a shaft parallel to the rotating shaft, and rotates in a direction in which the surface plate rotates with respect to the rotating shaft, and the adjustment side of the battery pack is on the side of the saw cover. And the center of the shaft disposed near the front end of the battery pack in the space between the battery pack and the saw cover formed by providing the battery pack at an offset position. It is arranged so that it can rotate in the direction and upward direction,
Below the grip part of the handle, a space is formed above the saw cover in a side view ,
A space is formed behind the saw cover on the side of the battery pack on the side of the saw cover, and the adjustment lever extends rearward of the saw cover on the side of the battery pack on the side of the saw cover. Let
A portion of the adjustment lever that extends rearward from the saw cover is formed to be wide and biased toward the saw cover in a space on the side of the battery pack and rearward of the saw cover . Cutting machine. The portable cutting machine according to claim 1 , wherein the shaft is provided in a range from the link to the front of the battery pack.

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