JP2012196733A - Power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance operability of a trimmer by further enhancing a slip stopping function of a base attachment seat part and body supporting part to a tip of a finger or the like though movement operation of the trimmer used for trimming working of a workpiece is performed upon working by pushing the base attachment seat part by one hand and holding the body supporting part by the other hand.SOLUTION: An elastomer coated part 30 is provided on the nearly entire surface of the body supporting part 20 held by one hand of a user and slip stopping parts 40 and 41 to the tip of the finger are right and left symmetrically provided on the elastomer coated part 30. Protrusions 40a and 41a are formed in a vertically striped pattern in the slip stopping parts 40 and 41.

Description

  The present invention relates to a rotary tool called a trimmer, for example, and relates to an electric tool mainly used for trimming or grooving of a workpiece such as wood.

The trimmer includes a base assembly having a flat plate-shaped base to be brought into contact with the upper surface of the workpiece and a cylindrical main body support portion, and a columnar tool main body that is detachably held by the main body support portion of the base assembly. Yes.
The base assembly has a configuration in which a cylindrical body support portion is integrally provided in an upright state on an upper surface of a base mounting seat portion to which the base is attached. The tool body is also referred to as a motor unit, and includes an electric motor as a drive source, and a spindle that is rotated by the electric motor is provided in a state of protruding from the lower surface. A blade is attached to this spindle.
The main body support portion of the base assembly is provided with a clamp device for fixing the tool main body to the main body support portion. When this clamping device is unclamped, the tool body can be moved up and down to switch between a state in which the cutting tool protrudes toward the lower surface of the base and a state in which the cutting tool is retracted upward from the lower surface. It can be removed from the top and removed.
Further, in many cases, the main body support portion is provided with an adjustment mechanism for adjusting the vertical position of the tool main body. By operating this adjustment mechanism in a state where the clamp device is unclamped, the vertical position of the cutting tool relative to the workpiece can be adjusted by adjusting the vertical position of the tool body.
When using this trimmer for actual machining operations, the user holds the base assembly support portion of the base assembly with one hand and presses the base mounting seat against the workpiece side with the other hand to hold the trimmer. And move along the upper surface of the workpiece. For this reason, various devices have been conventionally used for convenience when the user holds each part of the trimmer, or for improving operability and workability when holding the trimmer. For example, a technique is known in which an elastomer layer is coated on the surface of a resin base assembly formed using a synthetic resin as a raw material to enhance its grip feeling and anti-slip function. Patent Document 1 below discloses a configuration in which an uneven portion for preventing slippage is provided on the upper surface of the base mounting seat portion of the base assembly and the surface of the main body support portion.
As described above, with respect to the hand-held work tool that the user holds in his / her hand, the operability and work of the work tool can be improved by improving the gripping property of the part (handle portion) mainly gripped by the user as described above. The device which raises the nature is made.

US Patent Publication No. 7552749

However, the power tools such as the trimmer described above need to further improve the gripping ability and the anti-slip function.
An object of the present invention is to further improve the gripping ability and the anti-slip function in a power tool such as a trimmer.

The above problems are solved by the following invention.
According to a first aspect of the present invention, there is provided a tool main body having a spindle that is rotated by an electric motor, a main body supporting portion that supports the tool main body, and a base that is attached to a base mounting seat portion of the main body supporting portion and contacts a workpiece. A power tool that includes a base assembly and that projects a workpiece by projecting a cutting tool attached to a spindle downward from the lower surface of the base, and the main body support has a function as a gripping part that a user grips. The power tool is provided with a plurality of ridges extending in the vertical direction on the surface of the main body support portion to serve as a non-slip portion with respect to the fingertip.
According to the first invention, when using a power tool such as a trimmer, the user grips the main body support with one hand and presses the base mounting seat against the workpiece with the other hand, Hold the position and move in the processing direction. In this case, since the user grips the main body support part from the side (lateral direction) with one hand, the direction in which the vertical (longitudinal) ridges intersect the moving direction (sliding direction) of the fingertip. Thus, the anti-slip function of the anti-slip portion with respect to each fingertip can be further enhanced, and as a result, the gripping ability of the electric power tool can be improved.
The second invention is the electric tool according to the first invention, wherein the cross-sectional shape of each protrusion of the anti-slip portion is formed in a mountain shape with a tight angle on the side where the finger is removed. According to the second aspect of the invention, the anti-slip function of the anti-slip part can be further enhanced, and a good grip feeling can be further enhanced when the user feels this high anti-slip function on the fingertip.
According to a third invention, in the first or second invention, the anti-slip portion is a power tool provided symmetrically over a reverse L-shaped region in a range where the fingertip of the gripped hand is in contact. According to the third invention, when the left and right sides of the main body support portion are provided with anti-slip portions symmetrically in the inverted L-shaped region, and when the main body support portion is gripped with the right hand or when the left hand holds It is provided corresponding to both.
For example, when the main body support part is gripped from the back side with the right hand, the thumb is brought into contact with the anti-slip part on the right side when viewed from the front side, and the other fingertips are brought into contact with the anti-slip part on the left side when viewed from the front side. . The thumb is in contact with a region extending in the circumferential direction (lateral direction) of the main body support portion, which is an inverted L-shaped upper portion. The other fingertip of the right hand is in contact with a region that extends in the axial direction (vertical direction) of the main body support portion, which is an anti-slip portion on the opposite side. In this way, the anti-slip portion having an inverted L shape is provided symmetrically on the surface of the main body support portion where the fingertip of the gripped hand hits, so that the main body support portion is gripped with the right hand and the left hand. In both cases, a high anti-slip function can be exhibited, and as a result, the anti-slip function of the hand against the main body support portion can be enhanced.
Further, since the left and right side portions of the main body support portion are provided with inverted L-shaped anti-slip portions, and both anti-slip portions are provided with vertically striped protrusions extending vertically, the main body support portion and thus the appearance of the power tool Can improve the appearance (good appearance).

A fourth invention is the electric tool according to any one of the first to third inventions, wherein each protrusion is provided along a direction inclined with respect to the axis of the tool body. According to the fourth invention, it is possible to further enhance the anti-slip function of the anti-slip part when considering that the direction in which one hand holding the main body support part is obliquely upward or obliquely downward is often considered. it can.
A fifth invention is an electric tool according to any one of the first to fourth inventions, wherein an elastomer is coated on a main body support portion, and an anti-slip portion is provided on the elastomer coating portion. According to the fifth aspect, since the elastomer is coated in a range where the hand holding the main body support portion comes into contact, the slip of the main body support portion is prevented by the anti-slip function of the anti-slip portion and the anti-slip function of the elastomer itself. The stopping function can be further enhanced. In addition, since the hand holding the main body support portion is brought into contact with the elastomer covering portion, it is possible to improve the fit (gripability) to the hand.
According to a sixth aspect of the present invention, there is provided a tool body having a spindle that is rotated by an electric motor, a body support portion that supports the tool body, and a base that is attached to a base mounting seat portion of the body support portion and abuts against a workpiece. A power tool equipped with a base assembly that projects the workpiece by projecting the cutting tool attached to the spindle downward from the bottom surface of the base, and the base mounting seat and body support are made of aluminum as a single piece It is a power tool whose surface is coated with an elastomer.
According to the sixth invention, in the power tool such as a trimmer having a unique configuration for supporting the tool main body on the main body support portion of the base assembly, the base mounting seat portion and the main body support portion are made of aluminum because the base mounting seat portion and the main body support portion are made of aluminum. Compared to the above, it is possible to achieve higher rigidity and higher accuracy, and to cover the surface of the base mounting seat portion or the main body support portion with an elastomer, thereby improving its gripping ability and anti-slip function.

It is the whole electric tool front view of this embodiment. It is a perspective view of the base assembly of the state which removed the tool main body. FIG. 3 is a rear perspective view of the base assembly as viewed from the direction of arrow (III) in FIG. 2. It is an expanded view of a base assembly. FIG. 5 is a cross-sectional view taken along line (V)-(V) in FIG.

Next, an embodiment of the present invention will be described with reference to FIGS. In each embodiment described below, a trimmer for edging (trimming) mainly the edge portion of the workpiece W as the power tool 1 is illustrated. As shown in FIG. 1, the electric tool 1 includes a tool main body 10 in which an electric motor is housed, and a base assembly 20 for holding the tool main body 10 against a workpiece W.
The tool body 10 has a substantially cylindrical shape, and is provided in a state in which the spindle 11 protrudes from the lower surface thereof. A blade 12 is mounted on the spindle 11.
As shown in FIGS. 2 and 3, the base assembly 20 includes a base 23 to be brought into contact with the upper surface of the workpiece W and a cylindrical main body support portion 22. An annular base mounting seat 21 projecting in the circumferential direction is integrally provided at a lower portion of the main body support 22. Similarly, a base 23 having an annular shape is attached to the lower surface of the base attachment seat 21 in an attached state.
The tool body 20 is inserted and held on the inner peripheral side of the body support portion 22. The cutting tool 12 is protruded downward from the lower surface of the base 23 and pressed mainly against the edge of the workpiece W, and the electric power tool 1 is moved along the edge of the workpiece W in this pressed state. Border processing can be performed.
When the user operates the electric tool 1 to move, the user holds the head (upper part) of the tool body 10 or the body support portion 22 of the base assembly 20 with one hand, and the base mounting seat with the other hand. 21 is pressed and the position of the electric power tool 1 with respect to the workpiece W is controlled. For this reason, the base assembly 20 has a function as a holding part which a user holds in addition to the function of holding the tool body 10.
The inner peripheral side of the base mounting seat portion 21 functions as an escape hole 21c for allowing the cutting tool B of the tool body 10 to pass to the lower surface side. A main body support portion 22 is provided on the upper surface of the base mounting seat portion 21 so as to stand upward. In the case of the present embodiment, the base mounting seat portion 21 and the main body support portion 22 are integrally formed of a casting made of aluminum.

The main body support portion 22 includes an upper slit portion 22a and a lower window portion 22b on the front side. For this reason, the main body support portion 22 has a C-shaped cross section precisely, and has appropriate elasticity in the diameter expansion direction. A clamp device 25 is provided in the slit portion 22a. The clamp device 25 includes a lever 25b provided so as to be tiltable in the left-right direction via a support shaft 25a. In FIG. 2, when the lever 25b is tilted to the unclamping position (right side) on the near side, the action of the cam portion (not shown) provided on the clamp rod 25c is released, and the main body support portion 22 is elastically moved. The tool body 10 can be displaced up and down with respect to the main body support portion 22 and can be taken out and taken out upwardly in the diameter-expanding direction (direction in which the slit portion 22a becomes wider). When the lever 25b is tilted to the left clamp position, the main body support portion 22 is contracted in the direction of diameter reduction (direction in which the slit portion 22a becomes narrower) against the elasticity by the action of the cam portion of the clamp rod 25c. Thus, the tool body 10 is firmly clamped to the body support 22.
The clamp device 25 is provided with an adjustment mechanism 26. An adjustment dial 26a is attached to the end of the clamp rod 25c. Further, as shown in FIG. 3, an adjustment gear 26b is attached to the clamp rod 25c in the slit portion 22a. When the adjustment dial 26a is rotated, the adjustment gear 26b rotates integrally with the clamp rod 25c. As shown in FIG. 1, the adjustment gear 26 b is meshed with a rack portion 13 provided on a side portion of the tool body 10. The rack portion 13 is provided on the side portion of the tool body 10 along the top and bottom. On both sides of the rack portion 13, scales 13 a and 13 b for displaying the projecting dimensions of the cutting tool 12, which are positions where the tool body 10 is attached to the base assembly 20, are displayed. When the adjustment dial 26a is rotated while the clamp device 25 is unclamped, the tool body 10 can be displaced up and down through the engagement of the adjustment gear 26b with the rack portion 13. After adjusting the vertical position of the tool main body 10 with respect to the main body support portion 22, when the lever 25b is tilted to the clamp position, the tool main body 10 is clamped at the adjusted vertical position.
The front-side window portion 22b is a window portion for allowing the user to look through the processed portion of the blade 12 with respect to the workpiece W through the hole 21c, and is provided with a larger opening width on the left and right than the slit 22a.

The base mounting seat portion 21 and the main body support portion 22 are devised to enhance the grip feeling when the user grips and to have a high anti-slip function. Anti-slip portions 21a and 21a are provided at two positions on the peripheral side of the base mounting seat portion 21 on the front side. In the present embodiment, a plurality of concavo-convex portions are formed on the peripheral portion to form the anti-slip portions 21a and 21a. When the user presses the base mounting seat 21 against the workpiece with the fingertip, a high antislip function can be exhibited by bringing the fingertip into contact with the antislip portions 21a and 21a. In the present embodiment, anti-slip is provided at the two left and right positions near the front of the base mounting seat 21 corresponding to both the case where the base mounting seat 21 is pressed with the right hand and the case where the base mounting seat 21 is pressed with the left hand. Portions 21a and 21a are provided.
Further, corresponding to the left and right anti-slip portions 21a and 21a, finger-holding wall portions 21b and 21b are respectively provided behind them. The two finger retaining walls 21 b and 21 b are provided on the upper surface of the base mounting seat 21 along the upper surface of the base mounting seat 21 from the left and right lower ends of the window 22 b of the main body support 22. The two finger retaining walls 21b and 21b prevent the fingertip pressing the base mounting seat portion 21 from sliding toward the inner peripheral side relief hole 21c.
The periphery of the main body support portion 22 is covered with an elastomer (a polymer having a rubber-like elasticity (polymer)). In the present embodiment, the elastomer covering portion 30 is provided over a range of a substantially half circumference on the back side of the main body support portion 22 and a range protruding from the left and right above the window portion 22b on the front side. In the almost half-circumference range on the back side of the elastomer covering portion 30, the palm of the hand held by the user is mainly brought into contact. The fingertip mainly comes into contact with the left and right side portions of the elastomer covering portion 30 and the range extending from the upper portion thereof to the upper portion of the window portion 22b. In particular, a thumb is brought into contact with one of the ranges protruding from the left and right above the window portion 22b, and an index finger is brought into contact with the other. FIG. 4 shows the elastomer covering portion 30 in an unfolded state. In FIG. 4, the illustration of the clamp device 25 is omitted.

Hereinafter, a range where the palm on the back side of the elastomer covering portion 30 is in contact is referred to as a back contact region 31. The ranges of the left and right side portions of the elastomer covering portion 30 are referred to as a left side contact region 32 and a right side contact region 33, respectively. The left side of the range of the left and right side abutting portions 32, 33 projecting from the upper part of the window 22b is referred to as the left front abutting region 34, and the right side is referred to as the right front abutting region 35.
For example, as shown in FIG. 4, when the user holds the main body support portion 22 from the back side with the right hand, the palm of the hand comes into contact with the back contact area 31 and the fingertip of the thumb comes into contact with the right front contact area 35. The fingertip of the index finger is brought into contact with the left front contact area 34, and the other fingertips are brought into contact with the left side contact area 32. Conversely, when the main body support 22 is gripped with the left hand, the palm is similarly brought into contact with the back contact area 31, the fingertip of the thumb is in contact with the left front contact area 34, and the index finger is in the right front contact area 35. The other fingertips are in contact with the right side contact area 33. Thus, in this embodiment, the elastomer coating | coated part 30 is provided ranging over the left-right symmetrical inverted L-shaped area | region corresponding to the case where it hold | grips with the right hand, and the case where it holds with the left hand.
Further, anti-slip portions 40 and 41 are provided on the left and right side portions of the elastomer covering portion 30. The left anti-slip portion 40 is provided in an inverted L-shaped range straddling the left side contact region 32 and the left front contact region 34. The right non-slip portion 41 is provided in an inverted L-shaped range straddling the right side contact region 33 and the right front contact region 35. The left and right anti-slip portions 40 and 41 are provided with protrusions 40a to 40a and 41a to 41a extending vertically. As shown in the drawing, each of the protrusions 40a and 41a is inclined at a slight angle in the direction of displacement toward the back side toward the lower side. Moreover, as shown in FIG. 5, each protrusion 40a, 41a is formed in the cross-sectional mountain shape of the angle | corner tight in the direction in which the fingertip shown by the white arrow in the figure slides. On the contrary, each protrusion 40a, 41a is formed in a mountain-shaped cross section with a gentle angle in the direction in which the fingertip enters when gripping (the direction opposite to the white arrow in FIG. 5). As described above, the cross-sectional chevron shape of each protrusion 40a, 41a is inclined at a tighter angle with respect to the sliding direction of the fingertip, so that the hand holding the main body support portion 22 is reliably prevented from slipping and gripping. In some cases, the resistance to the fingertip is reduced to obtain a better grip feeling.
In addition, since the protrusions 40a and 41a of the anti-slip portions 40 and 41 are inclined at a slight angle in a direction in which the protrusions 40a and 41a are displaced toward the back side, the approach direction of the fingertip of the hand holding the main body support portion 22 is inclined. In many cases, the slip-preventing function of the anti-slip portions 40 and 41 can be further enhanced in consideration of the fact that the (sending direction) and the opposite slip direction are often obliquely upward.
A ruler fixing portion 24 is provided at the lower back of the main body support portion 22. When a parallel ruler (not shown) is set on the ruler fixing portion 24 and the ruler fixing screw 24 a is tightened, the parallel ruler can be attached to the back side of the main body support portion 22. For example, by moving the electric tool 1 in a state where the attached parallel ruler is in contact with the edge of the workpiece W, the cutting depth of the cutting tool 12 with respect to the edge of the workpiece W is kept constant and the electric tool 1 is moved. By moving the tool 1 in parallel, highly accurate edge processing can be performed quickly.

According to the electric power tool 1 of the present embodiment configured as described above, the user holds the main body support portion 22 with one hand and presses the base mounting seat portion 21 with the other hand to hold the electric power tool 1. Hold the position and move in the processing direction. An elastomer covering portion 30 is provided on the surface of the main body support portion 22, and anti-slip portions 40 and 41 are provided on the elastomer covering portion 30 symmetrically. The elastomer covering portion 30 enhances the grip feeling of the main body support portion 22 (feels fit to the hand), and also obtains the anti-slip function of the anti-slip portions 40 and 41 in addition to the anti-slip function of the elastomer covering portion 30 itself. As a result, an extremely high anti-slip function of the main body support portion 22 can be obtained, and as a result, the operability and workability of the electric power tool 1 can be improved.
Moreover, the left and right anti-slip portions 40 and 41 have vertically striped protrusions 40a to 40a and 41a to 41a extending in the vertical direction. Therefore, when the user grips the main body support portion 22 from the back side (lateral direction) with one hand, the direction in which the protrusions 40a and 41a intersect with the moving direction (sliding direction and insertion direction) of the fingertip. Therefore, the anti-slip function of the anti-slip portions 40 and 41 with respect to each fingertip can be further enhanced, and as a result, the gripping property of the electric power tool 1 can be improved.
Further, the cross-sectional shape of each protrusion 40a, 41a of the left and right anti-slip parts 40, 41 is formed in a mountain shape with a tight angle on the side where the fingers are removed (sliding direction). , 41 can be further enhanced, and a good grip feeling can be further enhanced when the user feels this high anti-slip function on the fingertip.

Furthermore, since the anti-slip portions 40 and 41 are provided symmetrically on the left and right sides of the main body support portion 22, both the case where the main body support portion 22 is held with the right hand and the case where it is held with the left hand can be handled. It is possible to exhibit a high anti-slip function when the user's dominant arm is left or right.
Further, reverse L-shaped anti-slip portions 40 and 41 are provided on the left and right sides of the main body support portion 22, and both anti-slip portions 40 and 41 are provided with vertically striped protrusions 40 a to 40 a and 41 a to 41 a extending vertically. For this reason, it is possible to increase the body support portion 22 and, in turn, the rigorous appearance (good appearance) of the electric power tool 1.
Furthermore, in the present embodiment, the protrusions 40a and 41a of the anti-slip portions 40 and 41 are inclined at a slight angle in the direction of displacement toward the back side toward the lower side with respect to the axis (vertical direction) of the tool body 10. It is provided along the direction. For this reason, considering that the direction in which the hand holding the main body support 22 is extended is often obliquely upward, the ridges 40a and 41a are substantially orthogonal to the direction in which the hand is extended, The anti-slip function of the left and right anti-slip portions 40 and 41 can be further enhanced.
In addition, anti-slip portions 21 a and 21 a are also provided on the side portion of the base mounting seat portion 21 in a bilaterally symmetrical manner. For this reason, the anti-slip | skid function with respect to the said base attachment seat part 21 of the fingertip which presses down the base attachment seat part 21 can be improved. In addition, finger retaining wall portions 21b and 21b are provided at the left and right lower portions of the window portion 22b corresponding to the both slip preventing portions 21a and 21a. According to the finger retaining wall portions 21b and 21b, it is possible to prevent the fingertip pressing the base mounting seat portion 21 from slipping toward the escape hole 21. In this respect, the anti-slip function for the base mounting seat portion 21 is provided. It can be further enhanced. Since the anti-slip part 21a and the finger-holding wall part 21b are provided symmetrically to each other, both the case where the base mounting seat part 21 is pressed with the right hand and the case where it is pressed with the left hand can be handled. This makes it possible to always exhibit a high anti-slip function regardless of the user's dominant arm.
Furthermore, in the case of this embodiment, since the base mounting seat portion 21 and the main body support portion 22 are integrally formed of an aluminum casting, the rigidity is increased as compared with a configuration using resin as a raw material, and Processing accuracy can be increased.

Various modifications can be made to the embodiment described above. For example, the structure in which the elastomer covering portion 30 is provided on the surface of the main body support portion 22 and the left and right anti-slip portions 40 and 41 are provided on the elastomer covering portion 30 is illustrated. It is good also as a structure which provides a slip prevention part directly on the surface of the part 22. FIG.
Moreover, although the structure which shape | molds the base assembly 20 from aluminum is illustrated, you may shape | mold resin from a raw material. In this case, the same effect can be obtained by providing an elastomer covering portion on the surface of the resin main body supporting portion and providing the anti-slip portion symmetrically on the elastomer covering portion.

W ... Work material 1 ... Power tool (trimmer)
DESCRIPTION OF SYMBOLS 10 ... Tool main body 11 ... Spindle 12 ... Cutting tool 13 ... Rack part, 13a, 13b ... Scale 20 ... Base assembly 21 ... Base attachment seat part 21a ... Anti-slip part, 21b ... Finger stop wall part, 21c ... Escape hole 22 ... Main body Support portion 22a ... slit, 22b ... window portion 23 ... base 24 ... ruler fixing portion, 24a ... ruler fixing screw 25 ... clamp device 25a ... spindle, 25b ... lever, 25c ... clamp rod 26 ... adjustment mechanism 26a ... adjustment dial, 26b ... Adjustment gear 30 ... Elastomer covering part 31 ... Back contact area 32 ... Left side contact area 33 ... Right side contact area 34 ... Left front contact area 35 ... Right front contact area

Claims (6)

A tool body having a spindle that is rotated by an electric motor, a body support that supports the tool body, and a base assembly that is attached to a base mounting seat of the body support and comes into contact with a workpiece. A power tool for processing the workpiece by projecting a cutting tool attached to the spindle downward from the lower surface of the base,
The main body support part has a function as a grip part to be gripped by a user, and is provided with a plurality of protrusions extending in the vertical direction on the surface of the main body support part to form a non-slip part with respect to a fingertip. The electric tool according to claim 1, wherein a cross-sectional shape of each protrusion of the anti-slip portion is formed in a mountain shape with a tight angle on a side where a finger grip is removed. 3. The electric tool according to claim 1, wherein the anti-slip portion is provided in a symmetrical manner over an inverted L-shaped region in a range where a fingertip of a gripped hand is in contact. The electric tool according to any one of claims 1 to 3, wherein each protrusion is provided along a direction inclined with respect to an axis of the tool body. The electric tool according to any one of claims 1 to 4, wherein the main body support portion is covered with an elastomer and the elastomer covering portion is provided with the anti-slip portion. A tool body having a spindle that is rotated by an electric motor, a body support that supports the tool body, and a base assembly that is attached to a base mounting seat of the body support and comes into contact with a workpiece. A power tool for processing the workpiece by projecting a cutting tool attached to the spindle downward from the lower surface of the base,
The base mounting seat and the main body support are integrally formed of aluminum as a raw material, and an electric tool whose surface is covered with an elastomer.

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