JP2006289869A - Electric tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric tool which can eliminate hindrance to its smooth sliding due to a slight protuberance of a material to be cut which catches the tool, makes the material hardly susceptible to scratching by another member and can inhibit the local wear of the other member, in the electric tool with a sliding member which slidably touches the material as the other member aside from a base in order to reduce cutting resistance. <P>SOLUTION: A plate 8 with a slidably touching surface less resistant to sliding than the base 5 is attached to this electric tool, and the forward end surface in a cutting direction of the plate 8 and its slidably touching surface are connected together by an inclined surface 8e or a curved surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric tool having a base that slides on a material to be cut.

  A conventional power tool will be described with reference to FIGS. 1 and 2 show this example of a portable circle of an electric tool, which is a saw blade 1, an electric motor 2 that rotationally drives the saw blade 1, a housing 3 that houses the electric motor 2, and a saw blade that can rotate. And a base 5 having an opening 5 a provided below the housing 3 and the soba 4 so that the saw blade 1 can protrude from the lower surface. The soba 4 is attached to the housing 3. The base 5 is connected to the housing 3 or the soba cover 4 or to the housing 3 and the soba cover 4. The power of the electric motor 2 is transmitted to the saw blade 1 through the gear 6 and the like, and the saw blade 1 is driven to rotate.

  The base 5 is generally made of aluminum die cast, magnesium die cast, hard plastic, iron plate, or the like, and the surface thereof is plated or remains as it is.

  When the operator uses a portable circular saw of this structure, as shown in FIG. 3, the portable circular saw is pushed forward in the cutting direction while pressing the base 5 on the material 7 to be cut, so that the bottom surface of the base 5 is covered. Cut while closely contacting and sliding on the cutting material 7.

  Further, as disclosed in Japanese Patent Application Laid-Open No. 2001-315075 shown in FIG. 4, the base and the material to be cut are improved to reduce the sliding resistance and to prevent damage to the material to be cut. In some cases, another member such as a sliding contact sheet 8 made of a synthetic resin having wear resistance and low friction properties is provided on the sliding contact surface 5b side of 5 of the material to be cut 7.

JP 2001-315075 A

  In the above-described conventional electric tool, when the sliding contact sheet 8 mounted on the base 5 is slid on the material 7 to be cut, as shown in FIGS. 8b and the rear corner 8c in the cutting direction of the opening 8a that coincides with the opening 5a of the base 5 provided on the sliding contact sheet 8 are easily caught by the material 7 to be cut, such as a slight protrusion on the material 7 It becomes impossible to be caught and slid.

  Further, when starting the cutting operation, the main body of the circular saw is inclined with respect to the upper surface of the material 7 to be cut, and the bottom surface near the front end in the cutting direction of the sliding sheet 8 is slid on the upper surface of the material 7 to be cut. The cutting operation is frequently performed while gradually making the sliding contact sheet 8 and the upper surface of the workpiece 7 parallel to each other, whereby the cutting target material is cut by the front corner portion 8b of the sliding contact sheet 8 in the cutting direction. 7 is scratched, or the front corner 8b in the cutting direction is locally worn.

  Further, when the circular saw body is pulled up from the upper surface of the material 7 to be cut at the end of cutting, the circular saw body is gradually inclined with respect to the upper surface of the material 7 to be cut, and in the vicinity of the rear end surface in the cutting direction of the sliding contact sheet 8. The work of pulling up the bottom surface while sliding it on the top surface of the material to be cut 7 is frequently performed, but this causes the material to be cut 7 to be damaged by the rear corner 8d in the cutting direction of the sliding contact sheet 8, or the cutting direction. The rear corner 8d is locally worn.

  Further, the sliding contact sheet 8 attached to the bottom surface of the base 5 by adhesion is easily peeled off partly or entirely due to repeated contact with the material to be cut, which may hinder the work. It was.

  An object of the present invention is to provide an electric tool that eliminates the above-mentioned conventional drawbacks and has good slidability and workability.

  The object includes a blade, a motor that drives the blade, a housing that houses the motor, and a base having an opening and a bottom surface, and the blade is located below the bottom surface of the base via the opening. In an electric tool that protrudes and can be cut while sliding the base bottom surface on the upper surface of the mating member, the base bottom surface has an opening that communicates with the opening and has a sliding resistance smaller than that of the base. This is achieved by attaching a plate having a contact surface and connecting the front end surface in the cutting direction of the plate and the sliding contact surface with an inclined surface or a curved surface.

  Further, the blade, a motor that drives the blade, a housing that houses the motor, and a base having an opening and a bottom surface, the blade projects downward from the bottom surface of the base through the opening, In the electric tool capable of cutting work while sliding the base bottom surface on the upper surface of the counterpart material, at least the cutting direction front end surface of the base and the bottom surface are connected with an inclined surface or a curved surface, and the base bottom surface, This is achieved by bonding a sheet having an opening communicating with the opening and having a sliding contact surface having a sliding resistance smaller than that of the base.

  Further, the blade, a motor that drives the blade, a housing that houses the motor, and a base having an opening and a bottom surface, the blade projects downward from the bottom surface of the base through the opening, In the electric tool capable of cutting while sliding the base bottom surface on the upper surface of the mating member, the base bottom surface has an opening communicating with the opening and a central portion is curved toward the base bottom surface. However, this is achieved by adopting a configuration in which a plate having a sliding contact surface having a sliding resistance smaller than that of the base is attached by a fixing means.

  The power tool of the present invention can improve the workability by improving the sliding between the base and the material to be cut, reducing the cutting resistance, and preventing the cut material from being scratched, and suppressing the early life due to wear. It becomes possible to provide an electric tool that can achieve the above.

  One embodiment of the power tool of the present invention will be described with reference to FIGS. In addition, description is abbreviate | omitted about the structure similar to the conventional electric tool.

  As shown in FIGS. 7 to 9, the bottom surface of the base 5 has an opening 8 a that communicates with the opening 5 a of the base 5, and is a bottom surface that is a sliding surface with a sliding resistance smaller than the sliding resistance of the base 5. A synthetic resin plate 8 having the above is adhered. A resin containing fluorine (hereinafter referred to as a fluororesin) is attached to at least the sliding surface of the plate 8.

  The end surface of the plate 8 is formed by an inclined surface 8e continuous with the end surface of the base 5 as shown in FIGS. In particular, as shown in FIG. 7, the front end surface in the cutting direction (right direction in FIG. 7) and the rear end surface in the cutting direction have an inclined shape.

  Further, as shown in FIG. 9, an inclined surface 8 e is also provided in the rear inner peripheral portion (left side in the center of the drawing) of the opening portion 5 a of the base 5.

  As described above, since the front end surface in the cutting direction of the base 5 and the bottom surface which is the sliding contact surface of the plate 8 are connected by the inclined surface, the material to be cut is damaged by the front end surface in the cutting direction of the plate 8. It is possible to prevent the plate 8 from being peeled off from the base 5 by repeated cutting operations, and to prevent the wear of the front end surface of the plate 8 in the cutting direction.

  Further, the shape in which the rear end surface in the cutting direction of the base 5 is connected to the bottom surface which is the sliding contact surface of the plate 8 by the inclined surface, and the shape in which the inclined surface 8e is provided also in the inner peripheral portion in the cutting direction rearward of the opening 5a of the base 5. As a result, it is possible to suppress the covering material from being damaged and to suppress the wear of the plate 8.

  In addition, when the plate 8 is worn out and the sliding resistance becomes large due to wear, the plate 8 is removed and a new plate 8 is attached, so that the sliding resistance can be easily lowered and slid easily. A good condition can be obtained.

  In the above embodiment, the end surface of the base 5 and the sliding contact surface of the plate 8 are connected by an inclined surface. However, the end surface of the plate 8 may be formed by a curved surface instead of the inclined surface. It is good also as a shape which the end surface and the sliding contact surface connected with the inclined surface or the curved surface.

  When the plate 8 is attached to the bottom surface of the base 5, the projection amount of the saw blade 1 is reduced by the thickness of the plate 8 and the cutting ability is lowered. Therefore, the thickness of the plate 8 is reduced. 7 to 9, it is desirable that the sliding contact surface of the plate 8 and the end surface of the base 5 be continuous.

  Next, another embodiment of the power tool of the power tool of the present invention will be described with reference to FIGS. In addition, description is abbreviate | omitted about the structure similar to the conventional electric tool.

  In the embodiment shown in FIGS. 7 to 9, the plate 8 is attached to the bottom surface of the base 5 by adhesion. However, in the present embodiment, the synthetic resin plate 8 is fixed to the base 5 with a plurality of fixing screws 10. It is configured to do.

  As shown in the drawing, the plate 8 is shaped so that the center portion is curved toward the bottom surface of the base 5 before being attached to the base 5, and the plate 8 is fixed to the four corners of the base 5 by four fixing screws 10. The plate 8 is configured to be fixed in the vicinity, and has a shape in which the front end surface in the cutting direction (right direction in FIG. 10), the rear end surface, and the bottom surface of the plate 8 are connected by the inclined surface 8e.

  With such a configuration, there is no fear that the adhesive surface will be peeled off when fixing by adhesion, and the adhesion between the plate 8 and the bottom surface of the base 5 can be improved and the adhesion state can be improved. Can last. In addition, since the inclined surface 8e is provided in the vicinity of the end surface of the plate 8, the occurrence of local wear at the end portion can be suppressed.

  Moreover, since it was set as the structure which can attach or detach the plate 8 with the fixing screw 10, the exchange operation | work of the plate 8 can be performed easily and workability | operativity can be improved more.

  Note that when the plate 8 is attached to the base 5, the fixing screw 10 does not protrude from the bottom surface of the plate 8, and the slidable contact is greater than the thickness of the fluororesin attached to the slidable contact surface of the plate 8. It is desirable to have a configuration located at a position away from the surface.

  The plate 8 itself may be configured to contain a fluororesin.

  Further, when the plate 8 is configured to be attached to the base 5 by the fixing screw 10 and adhesion, the contact state between the bottom surface of the base 5 and the plate 8 can be further maintained.

  Further, although not shown in the drawings, the plate 8 is configured to cover a part of the end portion of the base 5, and in particular, configured to cover a part of the front end portion in the cutting direction of the base 5. It can be difficult to leave.

  Furthermore, another embodiment of the power tool will be described with reference to FIGS. 12 and 13 by taking this portable round as an example. In addition, description is abbreviate | omitted about the structure similar to the conventional electric tool.

  In the above-described embodiment, the synthetic resin plate 8 is attached to the bottom surface of the base 5 by bonding or fixing. However, in the present embodiment, the sheet 11 containing a fluororesin is bonded to the base 5. ing.

  As shown in the figure, the bottom surface of the base 5, the front end surface in the cutting direction (right direction in FIG. 12), and the rear end surface are connected by an inclined surface 5c, and the sheet 11 is bonded to the bottom surface of the base 5. ing.

  By adopting such a configuration, it is possible to suppress the end portion of the sheet 11 from coming into contact with the upper surface of the material to be cut, and to prevent peeling from the bottom surface of the base 5 and occurrence of wear.

  Moreover, as shown in the drawing, the sheet 11 has a shape that covers at least a part of the end surface of the base 5, so that the end portion does not come into contact with the upper surface of the material to be cut and can be configured to be more difficult to peel off.

  Similarly to the above-described embodiment, when the sheet reaches the end of its life, the sheet can be easily replaced at low cost, and workability can be improved.

  Although not shown, the sheet 11 shown in FIGS. 12 and 13 communicates with the opening 5a provided in the base 5 and has a shape provided with an opening having substantially the same shape.

  In the above embodiment, the base 5 is provided with the inclined surface 5c or the plate 8 with the inclined surface 8e. However, the base 5 may be formed by a curved surface instead of the inclined surface.

The perspective view which shows an example of an electric tool. Sectional drawing which shows an example of an electric tool. The perspective view which shows one working state of an electric tool. The perspective expansion view which shows an example of the conventional electric tool. The principal part expanded partial sectional view of the electric tool shown in FIG. The principal part enlarged view of FIG. The front view which shows one Embodiment of the base which comprises this invention electric tool. The right view of FIG. The principal part expanded sectional view of FIG. The expanded view which shows other embodiment of the base which comprises this invention electric tool. The right view of FIG. The front view which shows other embodiment of the base which comprises this invention electric tool. The right view of FIG.

Explanation of symbols

1 is a saw blade, 2 is an electric motor, 3 is a housing, 4 is a saw cover, 5 is a base, 5a is an opening of the base, 5b is a sliding surface of the base, 6 is a gear, 7 is a material to be cut, and 8 is a sliding contact The sheet, 8a is an opening portion of the sliding contact sheet, 8b is a front end portion in the cutting direction, 8c is a rear corner portion in the cutting direction of the opening portion, 8d is a rear end portion in the cutting direction, and 8e is an inclined surface.

Claims (10)

A blade, a motor for driving the blade, a housing for housing the motor, and a base having an opening and a bottom surface, the blade projecting downward from the bottom surface of the base through the opening, In the electric tool capable of cutting while sliding the base bottom surface on the upper surface,
A plate having an opening communicating with the opening and having a sliding contact surface having a sliding resistance smaller than that of the base is attached to the bottom surface of the base, and the front end surface of the plate in the cutting direction and the sliding contact surface are inclined surfaces. Or the electric tool characterized by making it the shape connected with the curved surface. The power tool according to claim 1, wherein the inner peripheral portion in the cutting direction of the opening of the plate and the sliding contact surface are connected by an inclined surface or a curved surface. The power tool according to claim 1 or 2, wherein the rear end surface of the plate in the cutting direction and the sliding contact surface are connected by an inclined surface or a curved surface. The center part of the said plate is formed in the shape curved toward the said base bottom face, The said plate was fixed to the said base with the fixing means, The Claim 1 characterized by the above-mentioned. Electric tool. The power tool according to any one of claims 1 to 4, wherein the plate has a shape covering at least a part of a front end surface in a cutting direction of the base. A blade, a motor for driving the blade, a housing for housing the motor, and a base having an opening and a bottom surface, the blade projecting downward from the bottom surface of the base through the opening, In the electric tool capable of cutting while sliding the base bottom surface on the upper surface,
At least the front end surface of the base in the cutting direction and the bottom surface are connected by an inclined surface or a curved surface, and the base bottom surface has an opening communicating with the opening, and has a sliding resistance smaller than that of the base. An electric tool characterized by adhering a sheet having a sliding contact surface. The power tool according to claim 6, wherein the inner peripheral portion and the bottom surface in the cutting direction of the opening are connected by an inclined surface or a curved surface. The power tool according to claim 6 or 7, wherein a rear end surface and a bottom surface of the base in a cutting direction are connected by an inclined surface or a curved surface. The power tool according to any one of claims 6 to 8, wherein the sheet has a shape covering at least a part of a front end surface in a cutting direction of the base. A blade, a motor for driving the blade, a housing for housing the motor, and a base having an opening and a bottom surface, the blade projecting downward from the bottom surface of the base through the opening, In the electric tool capable of cutting while sliding the base bottom surface on the upper surface,
A plate having an opening communicating with the opening on the bottom surface of the base and having a central portion curved toward the bottom surface of the base and having a sliding contact surface having a sliding resistance smaller than that of the base is fixed by a fixing means. An electric tool characterized by being attached.

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