JP2008155300A - Portable power tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable power tool having a handle portion adopting a gel state material, which handle portion can fully show the characteristic of the gel state material, and can easily fit to a palm, and is excellent in a feeling of soft touch, and can show the sufficient vibration isolating property and the effect as a shock absorbing material. <P>SOLUTION: In the portable power tool comprising a tool body portion having a driving source for generating rotary power and an output shaft at the tip end thereof so as to be driven by receiving the power from the driving source, and the handle portion extending from the tool body portion, the gel member made of the gel state material enclosed by a resinoid film has been attached at least to the handle portion via a mounting member and has been exposed from the mounting member. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention particularly relates to a portable power tool having an improved handle portion.

The handle part of a conventional portable power tool has a soft touch feeling of the hand holding the handle part, prevents vibrations from a drive source transmitted to the holding hand, and has an impact absorbing effect when it hits another object. Therefore, an elastomer or rubber made of a flexible resin material is integrally molded or attached by adhesion.
However, elastomers and rubbers are still insufficient in hardness.

  Therefore, further improvements have been implemented, and in Patent Document 1, a handle made of a soft material such as polypropylene resin surrounds a sealed vacant space with a mandrel, and a gel substance is placed in the sealed vacant chamber. A filled anti-vibration handle is disclosed.

Further, in Patent Document 2, a cushioning sheet in which a silicone-based gel cushioning material is sealed in a resin film is bonded to the front and back surfaces of the handle portion, and further gripped by a flexible vinyl chloride resin grip cover. A technique for covering the surface is disclosed.
JP-A-61-103786 JP-A-7-205055

  However, even in the above technique, the gel substance (silicone gel buffer material) is covered with a soft material such as polypropylene resin, or is covered with a flexible vinyl chloride resin grip cover. Therefore, the low stress, anti-vibration, and shock-absorbing properties that are the characteristics of gel-like substances cannot be fully demonstrated, and they are still not well-familiar with the palm and inferior to the soft touch feeling, and as a sufficient anti-vibration material and cushioning material The effect could not be demonstrated.

  Therefore, the present invention can sufficiently exhibit the characteristics of the gel-like substance in the handle portion adopting the gel-like substance, is easily adapted to the palm and has a soft touch feeling, and is also used as a sufficient anti-vibration material and cushioning material. The purpose is to be able to demonstrate the effect.

  The present invention will be described below. In addition, in order to make an understanding of this invention easy, the reference number of an accompanying drawing is attached in parenthesis, However, This invention is not limited to the form of illustration.

  A portable power tool according to claim 1 of the present invention includes a drive source (7) that generates rotational power, and an output shaft (3) that is driven by receiving power from the drive source (7). In a portable power tool (1) having a tool body (2) and a handle (4) extending from the tool body (2), a gel-like substance (12) sealed with a resin film (11) The gel member (8) made of is attached to at least the handle portion (4) via the attachment member (9) and exposed to the attachment member (9).

  In the portable power tool according to claim 2 of the present invention, the gel member (8) made of the gel material (12) sealed with the resin film (11) is raised from the surface of the mounting member (9). It is characterized by that.

  The portable power tool according to claim 3 of the present invention is characterized in that the gel member (8) is formed by being divided into a plurality of cells (8a, 8b, 8c, 8d, 8e).

The portable power tool according to claim 4 of the present invention is characterized in that the attachment member (9) is removable from the handle portion (4).

  In the portable power tool according to claim 5 of the present invention, the mounting member (9) includes an upper frame (9b) and a lower frame (9a), and the upper frame (9b) and the lower frame (9a) The gel member (8) is integrated with the outer peripheral edge (8f) interposed therebetween.

  In the portable power tool according to claim 6 of the present invention, a rear cover (9c) that covers the rear portion of the tool body (2) is integrally formed on the attachment member (9), and at least the rear cover (9c) The carbon brush holder (20) of the drive source (7) is covered.

  According to the first aspect of the present invention, the gel member made of the gel material sealed with the resin film is attached to at least the handle portion through the attachment member and exposed to the attachment member. Touching the palm, the low stress, anti-vibration and shock absorption characteristics of the gel-like substance can be fully exerted, it becomes easy to become familiar with the palm, and the soft touch feeling is improved. In addition, it can be used as a sufficient anti-vibration material and shock-absorbing material to reduce operator fatigue and protect the portable power tool from impacts when it collides with other objects due to dropping of the portable power tool. There is an advantage that can be achieved.

  According to the invention described in claim 2, since the gel member is raised from the surface of the mounting member, the palm directly hits the gel member without hitting the mounting member, so that it becomes easy to become familiar with the palm and the soft touch feeling is improved. There is an advantage of doing.

  According to the invention described in claim 3, since the gel member is formed by dividing it into a plurality of cells, there is an advantage that the gel member can be prevented from being deformed abnormally by the gripping force of the hand.

  According to the invention described in claim 4, since the attachment member can be removed from the handle portion, there is an advantage that maintenance of the gel member is easily performed.

  According to the fifth aspect of the present invention, the mounting member is composed of the upper frame and the lower frame, and the upper frame and the lower frame are integrated with the outer peripheral edge of the gel member interposed therebetween. On the other hand, there is an advantage that the mounting member and the gel member can be easily integrated while being greatly exposed.

  According to the sixth aspect of the present invention, the rear cover that covers the rear portion of the tool main body is integrally formed on the mounting member, and at least the carbon brush holder of the driving source is covered with the rear cover, so the rear cover is a cap of the carbon brush holder. As a result, the carbon brush can be easily replaced, and the number of parts and assembly man-hours can be reduced.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a front view of a portable power tool according to the present invention, FIG. 2 is a right side view of the power tool, FIG. 3 is a cross-sectional view taken along the line AA of the power tool, and FIG. FIG. 5 is a cross-sectional view taken along the line BB in FIG. 2.

  The portable power tool 1 shown in FIG. 1 to FIG. 3 is an impact driver having a motor 7 as a driving source, and houses the motor 7 as a driving source, and the rotational power from the motor 7 is not shown. A tool body 2 made of resin, aluminum alloy or the like having an output shaft 3 transmitted through a mechanism and an impact mechanism at the tip, a handle 4 extending downward from the tool body 2, and the handle 4 The battery pack 5 detachably mounted on the end opposite to the tool body 2 and the end of the handle portion 4 on the side connected to the tool body 2 and on the output shaft 3 side (front side) And a trigger switch 6 for turning on / off driving of the motor 7 provided.

  As shown in FIGS. 1 to 5, at the portion where the handle portion 4 and the tool main body portion 2 are connected to each other, the rear side of the tool main body portion 2 is on the opposite side (rear side) of the trigger switch 6 side. A mounting member 9 made of a thermoplastic resin material such as ABS resin that covers substantially half or more of the rear portion of the handle portion 4 is attached. A portion of the mounting member 9 formed in a substantially square shape is formed in a shape that matches a palm to be gripped and a curve between the thumb and the index finger. The material of the attachment member 9 may be a soft thermoplastic elastomer instead of a thermoplastic resin material such as ABS resin. If a soft thermoplastic elastomer is used, the attachment member 9 also has an effect as a vibration isolator and a buffer material.

In the attachment member 9, a substantially square-shaped portion formed in accordance with a curve between a palm to be gripped and a thumb and an index finger from a part of the rear portion of the tool body portion 2 to a rear portion of the handle portion 4. 5, the gel member 8 formed of the gel-like substance 12 sealed with the resin film 11 adheres the outer peripheral edge 8a formed by bonding the outer periphery of the upper and lower resin films 11 together. It is attached integrally.
In sealing the gel substance 12, only the side on which the palm to be gripped is covered is covered with the resin film 11, and the tool body 2 side may be a thermoplastic resin material such as ABS resin or a soft thermoplastic elastomer. .

  Further, as shown in FIG. 2, the gel member 8 is divided into five cells (8a, 8b, 8c, 8d, 8e). When the gel member 8 is configured with a plurality of cells in this way, the gel-like substance 12 forming the gel member 8 can be prevented from being abnormally deformed by the gripping force of the hand as compared with a single cell. Durability is improved.

  As the resin film 11 for sealing the gel substance 12, a polyurethane resin film, a silicone resin film, a fluororesin film or the like having excellent durability and chemical resistance is suitable, and any thickness of 50 μm to 500 μm can be adopted. Moreover, it may be a single resin film or a laminate of a plurality of resin films. In this embodiment, 300 μm is adopted. The gel substance 12 can be a silicone gel, an acrylic gel, a urethane gel, or the like. In this embodiment, the silicone gel is used. The hardness can be adopted as long as the penetration (JIS K-2207) is 50 to 200, but in this embodiment, 100 ± 50 is adopted.

  Next, a structure in which the gel member 8 is attached to and integrated with the attachment member 9 will be described with reference to FIGS. First, the attachment member 9 is integrally formed with a cup-shaped rear cover portion 9c that covers the rear portion of the tool main body portion 2, and is similar to the outer peripheral shape of the gel member 8 and sandwiches the outer peripheral edge 8f of the gel member 8. A lower frame 9a formed larger by a predetermined amount and a shape similar to the outer peripheral shape of the gel member 8 and larger by a predetermined amount so as to sandwich the outer peripheral edge 8f of the gel member 8 are formed on the resin film 11 of the gel member 8. The upper frame 9b is formed with a hole 9d for exposing a portion where the gel substance 12 is sealed.

Only the portion where the gel-like substance 12 is sealed to the resin film 11 of the gel member 8 is exposed and attached to the hole 9d of the upper frame 9b, and the outer peripheral edge 8f of the gel member 8 is sandwiched between the lower frame 9a and the upper frame 9b. The attachment member 9 and the gel member 8 are fixed and integrated by an ultrasonic welder or heat welding. As described above, since the portion where the gel substance 12 is sealed to the resin film 11 of the gel member 8 is exposed from the hole 9d of the upper frame 9b, the palm for gripping the handle portion 4 is lowered only through the resin film 11. It is attached to the repellent (low stress) gel substance 12, and the gel member 8 becomes easy to adjust to the palm, and the soft touch feeling is improved. In addition, the effect as a sufficient anti-vibration material and shock-absorbing material can be exhibited, the operator's fatigue can be reduced, and the impact driver can be protected from an impact at the time of collision with other objects due to the impact driver falling or the like. Furthermore, the gel member 8 also has an effect of blocking heat generated from the motor 7 and the bearing portion.
An adhesive may be used for fixing the outer peripheral edge 8f of the gel member 8 and the attachment member 9 together.

  Further, as shown in FIG. 5, the gel member 8 exposed from the hole 9d of the upper frame 9b of the attachment member 9 is formed so as to rise from the surface of the upper frame 9b. Since the gel member 8 is raised from the surface of the attachment member 9 in this way, the gel does not directly hit the tool body 2, the handle portion 4 and the attachment member 9 made of a material harder than the gel substance 12. Since it directly hits the member 8, it becomes easier to become familiar with the palm and the soft touch feeling is improved.

  Next, as shown in FIGS. 2 to 4, the cup-shaped rear cover portion 9 c formed integrally with the lower frame 9 a of the mounting member 9 covers the rear portion of the tool main body portion 2 and functions as a protective cover for the rear portion. It is formed so as to cover the insertion hole of the carbon brush holder 20 into which the carbon brush 21 of the motor 7 as a driving source is inserted, and has a function of a cap of the carbon brush holder 20. Thus, since the rear cover part 9c which covers the rear part of the tool main body part 2 is integrally formed on the attachment member 9, the carbon brush can be easily replaced, and the number of parts and the number of assembly steps can be reduced.

  2, the lower frame 9a of the attachment member 9 integrated with the gel member 8 is formed with screw holes 9e at three locations, and the handle portion 4 and the tool body 2 are formed by the attachment screws 10. It is attached to and removable. Further, as shown in FIGS. 3 and 5, the portions of the tool body 2 and the handle portion 4 to which the attachment members 9 are attached are formed in the recesses 2a and 4a, and the surface of the upper frame 9b of the attachment member 9 is the tool body. It does not protrude from the surface of the part 2 and the handle part 4. Thus, since the gel member 8 integrated with the attachment member 9 can be attached and detached, maintenance of the gel member 8 is facilitated. In addition, it may replace with the attachment screw 10, and may be a push nut integrally formed in the lower frame 9a of the attachment member 9, and may be fixed through a hook-and-loop fastener.

  As another embodiment of the attachment member 9, as shown in FIG. 6, the attachment member 9 is a single frame, and the portion of the gel member 8 where the gel-like substance 12 is sealed is exposed. It is formed by providing a hole 9d. An outer peripheral edge 8f formed on the outer periphery of the gel member 8 is fixed to the mounting member 9 by an ultrasonic welder, heat welding, or an adhesive and integrated. And the thing which this gel member 8 and the attachment member 9 integrated is attached to the handle | steering-wheel part 4 and the tool main-body part 2 with the attachment screw 10 so that attachment or detachment is possible.

 Further, the gel member 8 integrated with the attachment member 9 is attached from the rear part of the handle part 4 to a part of the rear part of the tool body part 2, but may be attached to the front part, the side part or the entire circumference of the handle part 4. Good.

The gel member 8 uses a colored resin film 11 and makes the gel substance 12 transparent. For this reason, the gel member 8 of various colors can be formed only by changing the color of the resin film 11, and the external appearance design of the impact driver can be improved. Conversely, the resin film 11 may be transparent, and the gel material 12 may be colored in various colors.
Further, the gel-like substance 12 can be further improved in appearance design by using a light emitting gel or a gel whose color changes by heat.

  In the above embodiment, the present invention is applied to the impact driver. However, the present invention can be applied not only to the impact driver but also to all power tools having a drive source in the tool body, such as a drill, a circular saw, and a chain saw, particularly the handle portion. .

It is a front view of the portable power tool which concerns on this invention. It is a right view of the portable power tool which concerns on this invention. It is an AA cross section arrow view of the portable power tool concerning the present invention. The front view which shows the state which integrated the gel member with the attachment member. It is a BB cross-sectional arrow view of FIG. It is a BB cross-sectional arrow view in other examples.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Portable power tool 2 Tool main-body part 4 Handle part 7 Motor 8 Gel member 9 Mounting member 9a Lower frame 9b Upper frame 9d Hole 11 Resin film 12 Gel-like substance

Claims (6)

  In a portable power tool that includes a drive body that includes a drive source that generates rotational power, an output shaft that is driven by receiving power from the drive source, and a handle that extends from the tool body. A portable power tool characterized in that a gel member made of a gel-like substance sealed with a resin film is attached to at least the handle portion via an attachment member and exposed to the attachment member.   The portable power tool according to claim 1, wherein a gel member made of a gel-like substance sealed with the resin film is raised from the surface of the mounting member.   The portable power tool according to claim 1 or 2, wherein the gel member is divided into a plurality of cells.   The portable power tool according to claim 1, wherein the attachment member is removable from the handle portion.   The mobile phone according to any one of claims 1 to 4, wherein the mounting member includes an upper frame and a lower frame, and the upper frame and the lower frame are integrated with an outer peripheral edge of the gel member interposed therebetween. Power tools.   6. The portable device according to claim 1, wherein a rear cover that covers a rear portion of the tool main body is formed integrally with the attachment member, and at least the carbon brush holder of the driving source is covered with the rear cover. Power tools.

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