JP2009172719A - Electric appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the shrinkage of a soft part at an attaching surface of each divided part of a box body, and to reduce a gap generated at the attaching surfaces of the box body, in an electric appliance having the box body formed into a two-layer structure of the soft part and a hard part to have at least two divided parts. <P>SOLUTION: In this electric appliance, the soft part 32 having a soft resin material is arranged on a front surface side and the hard part 33 having a harder resin material than that of the soft part 32 is arranged inside the soft part. The box body 17 is divided into at least two with prescribed attaching surfaces 31 and 41 as boundaries. The box body has running-around parts 34 and 35 which are formed at a side end of the attaching surface of the hard part 33 and in the vicinity of a boundary with the soft part and recessed more than the attaching surface so that the soft resin material may be run around when forming the soft part 32. The box body has a projecting part 36 projecting from a boundary surface of the hard part and the soft part 32 to the soft part 33 side and/or the attaching surface side so that a resin thickness of the soft resin material in the running-around parts may be thin. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electric device such as a power tool in which a housing is divided into at least two with a specific surface as a boundary.

  In power tools, etc., a soft part made of a soft resin material is placed on the surface side to prevent slipping, improve grip comfort, and absorb shock when dropped. A two-layered housing in which hard portions made of a material are arranged is used (see Patent Document 1).

  On the other hand, in the case of electric tools, etc., the housing is divided into two with the plane including the motor output shaft and the center line of the grip portion as the boundary from the viewpoint of ease of molding and assembly of the housing. It is configured to be able to. FIG. 4 shows a configuration of a pasting surface of a conventional two-layer housing. As shown in FIG. 4, the casing 100 is divided into two parts, that is, a first casing 110 and a second casing 120, and the first and second casings 111 and 121 are in contact with each other by screws or the like. The first casing 110 and the second casing 120 are coupled. Hereinafter, only the first housing 110 will be described, but the same applies to the second housing.

  In the first housing 110, in order to improve the adhesion between the soft part 112 located on the outside and the hard part 113 located on the inside, the soft part is located at the end of the hard part 113 on the side of the attachment surface 111 and on the outside. A stepped portion 114 that is recessed from the bonding surface 111 and a wraparound portion that is recessed from the stepped portion 114 are formed so that the soft resin wraps around when forming 112 (so-called anchor effect).

When the first housing 110 and the second housing 120 configured as described above are integrally formed by insert molding, the attachment surface of the soft portion 112, that is, the portion indicated by reference numeral 116 in FIG. Shrinkage occurs due to the contraction, and the attachment surface of the soft portion 112 falls in the direction indicated by the arrow A. The same applies to the second housing 120. Therefore, when the first housing 110 and the second housing 120 are coupled with the attachment surfaces 111 and 121 in contact with each other, there is a gap between the attachment surfaces 111 and 121 of the first housing 110 and the second housing 120. There is a possibility that water droplets or dust may enter the inside of the housing 100 from the gap. Further, since a gap is generated in the outer appearance portion of the housing 100, the appearance quality of the electric device is deteriorated.
JP 2002-254340 A

  The present invention has been made in order to solve the above-described problems of the conventional example, and in an electrical device having a housing formed of a two-layer structure of a soft part and a hard part and divided into at least two parts. An object of the present invention is to reduce the sink of the soft part on the bonding surface of each of the divided parts and to reduce the gap generated on the bonding surface of the housing.

In order to achieve the above object, according to the first aspect of the present invention, a soft portion formed of a soft resin material is disposed on the surface side, and a hard portion formed of a harder resin material is disposed on the inside thereof. In an electric device comprising a two-layered housing, the housing being divided into at least two with a predetermined bonding surface as a boundary,
Formed near the attachment surface side end portion of the hard portion and in the vicinity of the boundary portion with the soft portion, so that a soft resin material wraps around the soft portion when forming the soft portion. And a protruding portion protruding from the boundary surface between the hard portion and the soft portion toward the soft portion side and / or the attachment surface side so as to reduce the resin thickness of the soft resin material in the wraparound portion. It is provided with.

  According to a second aspect of the present invention, in the electric device according to the first aspect, the wraparound portion includes a stepped portion that is recessed from the bonding surface and a groove portion that is further recessed from the stepped portion. .

  According to a third aspect of the present invention, in the electric device according to the first or second aspect, the attachment surface is provided so as to include a portion of the housing that is gripped by a user's hand. .

  According to the present invention, when the soft part is molded from the soft resin material, the soft part in the vicinity of the attachment surface also recedes from the attachment surface due to the shrinkage of the resin even in the wraparound part, and sinking tends to occur. However, since there is a protruding portion formed of a hard resin material in the direction in which the soft portion moves backward, the resin thickness of the soft portion near the protruding portion is reduced, compared to the configuration of the conventional example without the protruding portion. , The occurrence of sink marks is reduced. As a result, the amount of collapse of the attachment surface of the soft portion is reduced, and the gap generated on the attachment surface is reduced when a plurality of divided parts are combined to form a housing. In addition, the possibility that water droplets, dust, and the like enter the inside of the housing from the gap is reduced, and the appearance quality of the electric device can be improved.

  An electrical apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an overall configuration of, for example, an electric driver as an embodiment of an electric tool according to the present invention.

  The electric power tool 1 includes a main body 10 and a battery pack 20 including a secondary battery that can be attached to and detached from the main body 10. The main body 10 includes, for example, a substantially cylindrical drive unit 12 provided with a drive mechanism that converts a motor and a driving force of the motor into a predetermined output (for example, decelerates) and transmits the output to the output shaft 11, and the central axis is a drive unit 12 with respect to the grip part 14 formed with a predetermined angle (for example, about 70 degrees) and provided with a control unit (not shown) for controlling the motor and the trigger switch 13. The battery pack mounting portion 15 is provided on the opposite side of the drive portion 12. The battery pack mounting portion 15 is further provided with an operation mode changeover switch 16 and the like. A battery pack 20 is coupled to the bottom portion (battery pack mounting portion) 15 of the housing 17.

  The entire main body 10, more specifically, a housing 17 that houses a motor, a drive mechanism, a control unit, and the like is formed of, for example, a resin molded product, and the center line L of the output shaft 11 of the drive mechanism and the grip portion It is configured to be divided into two parts, that is, a first housing 30 and a second housing 40 mainly on the left and right in a surface including 14 center lines M (attachment surface). In the following description, the first housing 30 will be mainly described, but the same applies to the second housing 40.

  The first housing 30 (and the second housing 40) each have a soft portion 32 formed of a soft resin material on the surface side, and a hard portion formed of a harder resin material on the inside thereof. It has a two-layer structure in which 33 is arranged. The soft portion 32 is a specific portion of the first housing 30 (and the second housing 40), specifically, the grip portion 14 held by the user and its vicinity, and the electric tool 1 is placed on the floor surface. It is provided on the part that touches the floor when placed. As a manufacturing method of the first housing 30 (and the second housing 40), the hard portion 33 is first formed using a hard resin material, and then the hard portion 33 is inserted into a mold. Thus, it is conceivable to form the soft portion 32 using a soft resin material.

  The configuration of the AA cross section in FIG. 2 is shown in FIG. In the first housing 30 (and the second housing 40), in order to improve the adhesion between the soft portion 32 located on the outside and the hard portion 33 located on the inside, the attachment surface 31 (41) side of the hard portion 33 At the end and outside, a stepped portion 34 that is recessed from the bonding surface 31 and a groove portion 35 that is further recessed from the stepped portion 34 so that the soft resin wraps around when forming the flexible portion 32 (so-called anchor effect). The wraparound part is formed. Further, a protruding portion 36 is formed that protrudes from the boundary surface 37 between the hard portion 33 and the soft portion 32 to the soft portion 32 side and from the stepped portion 34 to the bonding surface 31 side.

  According to such a configuration, when the soft portion 32 is molded with a soft resin material, the soft portion 32 in the vicinity of the abutting surface 31 is retracted from the abutting surface 31 due to contraction of the resin material, and sink marks are likely to occur. However, since there is a protruding portion 36 formed of a hard resin material in the direction in which the soft portion 32 moves backward, the resin thickness of the soft portion 32 in the vicinity of the protruding portion 36 is reduced, and the conventional example does not have the protruding portion. The occurrence of sink marks is reduced as compared with the above configuration. As a result, the amount of collapse of the attachment surface (indicated by reference numeral 38 in the figure) of the soft portion 32 is reduced.

  When the first housing 30 and the second housing 40 configured as described above are combined to form the housing 17, the gap generated between the attachment surfaces 31 and 41 is very small, and water drops, dust, and the like are generated from the gap. The possibility of entering the inside of the housing is reduced, and the appearance quality of the electric power tool (electric device) 1 can be improved. Further, even if the attachment surfaces 31 and 41 are provided in a portion of the housing 17 that is gripped by the user's hand, the gap between the attachment surfaces 31 and 41 is very small, There is no risk that nails or the like are caught in the gap, and a safe electric tool can be provided. The presence of the soft part 32 made of a soft resin material improves the operability by improving the anti-slip and grip comfort, and absorbs vibrations from the shock absorbing outdoor part when dropped. Protection can be achieved.

  The present invention is not limited to the above-described electric power tool, and has a double structure including a soft portion formed of a soft resin material at least in a part of the housing and a hard portion formed of a harder resin material. The present invention can be applied to all electrical devices having a housing divided into at least two parts, such as shavers and hair dryers.

The perspective view which shows the external appearance structure of an electric tool as a specific example of the electric equipment which concerns on one Embodiment of this invention. The top view which shows the structure of the 1st housing | casing divided | segmented into two among the housing | casing which has the two-layer structure of the electric tool in the said embodiment. The AA sectional view of the 1st case in Drawing 2 showing the composition near the attachment side of the case which has the two-layer structure in the above-mentioned embodiment. Sectional drawing which shows the structure of the bonding surface vicinity of the housing | casing which has the two-layer structure in the conventional electric equipment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric tool 17 Housing | casing 30 1st housing | casing 31 Abutting surface 32 Soft part 33 Hard part 34 Step part 35 Groove part 36 Projection part 37 Boundary surface of a soft part and a hard part 40 2nd housing | casing 42 Butting surface

Claims (3)

A soft layer formed of a soft resin material is disposed on the front surface side, and a two-layered housing having a hard part formed of a harder resin material disposed on the inner side is provided. In electrical equipment that is divided into at least two with the bonding surface of
Formed near the attachment surface side end portion of the hard portion and in the vicinity of the boundary portion with the soft portion, so that a soft resin material wraps around the soft portion when forming the soft portion. And a protruding portion protruding from the boundary surface between the hard portion and the soft portion toward the soft portion side and / or the attachment surface side so as to reduce the resin thickness of the soft resin material in the wraparound portion. Electrical equipment characterized by comprising   The electric device according to claim 1, wherein the wraparound portion includes a step portion that is recessed from the attachment surface and a groove portion that is further recessed from the step portion.   The electrical apparatus according to claim 1, wherein the attachment surface is provided so as to include a portion of the housing that is gripped by a user's hand.

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