JP2009028840A - Portable power tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve adhesion between protectors and a housing without increasing machining cost, metal mold cost and material cost. <P>SOLUTION: A locking portion 16 projecting in the wall thickness direction of the housing 6 is formed at each of the longitudinal ends 16 of the protectors 15a, 15b and 15c. By such a structure, the protectors 15a, 15b and 15c are jointed in a wedge driving manner to the housing 6 in a longitudinal end area. Therefore, even if a molding temperature is low, the adhesion between the protectors 15a, 15b and 16c and the housing 6 is improved, and the protectors 15a, 15b and 15c can be suppressed from being separated from the surface of the housing 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a portable electric tool such as an electric screwdriver.

  Conventional electric tools include various types of electric drivers such as a drill driver, an impact driver, an oil pulse driver, and the like according to the application, and include a battery-driven portable type. As a portable electric tool, a body part including a drive mechanism part including an electric motor and a switch part for controlling power supply to the electric motor are included, and a substantially right-angle direction from a longitudinal intermediate part or an end part of the body part And a grip portion that protrudes into an overall shape, and is configured to be generally T-shaped or substantially L-shaped, and is configured to grip and operate the grip portion. In this portable electric tool, a battery pack for driving the electric motor is detachably attached to the front end portion in the protruding direction of the grip portion.

The housing of this type of portable electric tool is generally formed as a cylinder having an elliptical or oval cross section by abutting the corresponding edges of two resin-made divided bodies having an arcuate cross section. The cylinder is equipped with a drive mechanism, switches, and the like. The housing surface including the boundary line between the two divided bodies prevents the tool from being damaged by dropping or colliding with the tool, and at the same time the tool itself from the impact at the time of dropping or colliding. In order to protect, the protector which consists of an elastic body is formed.
JP 2002-254340 A JP 2005-199406 A JP 2005-254377 A Japanese Patent No. 3716751

  According to the conventional portable power tool, since the housing and the protector are formed of the resin and the elastic body, respectively, the adhesion between the housing and the protector is poor, and when the tool is used, the protector is peeled off from the surface of the housing. As a result, the above-described functions may not be expressed. In order to solve such problems, a method of promoting the chemical adhesion between the housing and the protector by increasing the molding temperature can be considered, but when the molding temperature is increased, the product is cooled and removed from the mold. The time to take out becomes longer. Further, in a normal molding process, the gate position for allowing the elastic body to flow is set at the center of the covering region of the protector, and the end of the protector is the final point of the flow of the elastic body, so the molding temperature of the protector end is low. Therefore, it is necessary to increase the number of gates in order to increase the molding temperature of the protector end, resulting in increased processing costs, mold costs, and material costs.

  The present invention has been made to solve the above-mentioned problems, and its purpose is a portable electric tool capable of improving the adhesion between the protector and the housing without increasing the processing cost, mold cost, and material cost. Is to provide.

  A portable electric tool according to a first aspect of the present invention includes an electric motor as a drive source, a speed reduction mechanism portion that transmits the rotational power of the electric motor, a drive portion that transmits the rotational power of the speed reduction mechanism portion to the tip tool, and a drive A housing having a body outer shell including a bearing portion that rotatably holds the portion and a grip outer shell including a switch unit that controls power supply to the electric motor, the housing being a circumferential end of the two divided bodies In a portable electric tool that is formed in a substantially cylindrical shape with edges attached to each other and a battery pack mounting portion is formed at the longitudinal tip of the grip portion outer shell, the housing surface including the boundary line between the two divided bodies A protector made of an elastic body is provided, and a locking portion that protrudes in the thickness direction of the housing is formed at the longitudinal end of the protector.

  A portable electric tool according to a second aspect of the present invention is characterized in that, in the portable electric tool according to the first aspect, the distal end portion of the locking portion has a substantially trapezoidal shape in which the side surface portion in the longitudinal direction is inclined.

  A portable electric tool according to a third aspect of the present invention is the portable electric tool according to the second aspect, characterized in that the side surface in the longitudinal direction has a surface parallel to the thickness direction of the housing.

  A portable electric tool according to a fourth aspect of the present invention is the portable electric tool according to the first aspect, characterized in that the side surface in the longitudinal direction of the locking portion has a curved shape.

  The portable electric tool according to claim 5 of the present invention is characterized in that, in the portable electric tool according to claim 1, a rectangular-shaped convex portion is provided on the side surface in the longitudinal direction of the locking portion.

  A portable electric tool according to a sixth aspect of the present invention is the portable electric tool according to any one of the first to fifth aspects, wherein the protector protrudes from the housing surface, and the longitudinal direction of the protector. The end portion is formed with an inclined portion so that the surface height of the protector is substantially the same as the surface height of the housing.

  A portable electric tool according to a seventh aspect of the present invention is the portable electric tool according to any one of the first to fifth aspects, wherein the height of the surface of the housing at the end portion in the longitudinal direction of the protector is the protector. It is characterized by being higher than the surface height.

  A portable electric tool according to an eighth aspect of the present invention is the portable electric tool according to any one of the first to seventh aspects, wherein the protector includes a boundary line between two divided bodies. It is formed on the surface, and the longitudinal end portion of the protector is formed in a region other than the region in the vicinity of the minimum diameter portion of the grip portion outline.

  According to the portable power tool of the first aspect of the present invention, the protector is joined so as to wedge the housing surface in the end region in the longitudinal direction, thereby increasing the processing cost, the die cost, and the material cost. It is possible to improve the adhesion between the protector and the housing without causing them to occur.

  According to the portable electric tool according to claim 2 of the present invention, even if stress is applied to the protector in the direction of peeling from the housing surface, the protector is prevented by the resistance of the tip of the locking portion. It becomes difficult to peel off from the housing surface.

  According to the portable electric tool according to the third aspect of the present invention, the front end portion of the locking portion becomes closer to the wedge shape, so that the adhesion between the protector and the housing can be further improved. Further, since the thickness of the housing to be pressed when the end of the protector on the housing side is deburred is increased, the deburring operation is facilitated.

  According to the portable electric tool according to the fourth aspect of the present invention, the stress generated by the impact at the time of dropping or collision can be relieved in the locking portion.

  According to the portable electric tool according to claim 5 of the present invention, even when stress is applied to the protector in the direction in which the protector is peeled from the housing surface, the protector is prevented by the resistance of the distal end portion of the locking portion. It becomes difficult to peel off from the housing surface. Further, since the thickness of the housing to be pressed when the end portion of the protector on the housing side is deburred is increased, the deburring operation is facilitated.

  According to the portable electric tool according to the sixth aspect of the present invention, when stress is generated in the creeping direction of the housing surface by a fingernail or other object, the stress is not easily applied in the direction of peeling the protector from the housing surface. Therefore, it becomes difficult for a protector to peel from the housing surface.

  According to the portable electric tool according to claim 7 of the present invention, when stress is generated in the creeping direction of the housing surface by a fingernail or other object, the stress is not easily applied in the direction of peeling the protector from the housing surface. Therefore, it becomes difficult for a protector to peel from the housing surface.

  According to the portable electric tool according to the eighth aspect of the present invention, it is possible to minimize the influence of the stress generated by the impact at the time of dropping or the collision, and to improve the reliability.

  Hereinafter, a configuration of a portable drill driver according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, a portable drill driver 1 according to an embodiment of the present invention includes an elongated body portion 4 including a drive mechanism portion 3 including an electric motor 2 and an intermediate body portion 4. The grip portion 5 is projected from the portion at a substantially right angle, and the operator grips the grip portion 5 and operates the drill driver 1. The housing 6 of the drill driver 1 is roughly defined by an outer shell 4G (hereinafter abbreviated as a body shell outer shell 4G) including the drive mechanism portion 3 and an outer shell 5G (hereinafter abbreviated as a grip portion outer shell 5G) of the grip portion 5. It is formed so as to form a T shape.

  The trunk part outline 4G is formed in a substantially cylindrical shape. The drive mechanism unit 3 included in the body shell outline 4G includes an electric motor 2 that is a drive source, a speed reduction mechanism unit 7 that decelerates the rotation of the electric motor 2, and a rotational driving force of the speed reduction mechanism unit 7 that uses the chuck 8 at the tip. And a bearing unit 10 that rotatably holds the drive unit 9. The grip portion outer shell 5G is also formed in a substantially cylindrical shape. A switch part 11 for controlling the power supply to the electric motor 2 is attached inside the grip part outline 5G, and the switch part 11 is actuated by a trigger 12 attached to the base side of the grip part 5 so as to be freely pushed. It has become.

  The protruding end (lower end portion in the figure) of the grip portion outer shell 5G is larger than the middle portion in the longitudinal direction (substantially vertical direction in FIG. 1) of the grip portion outer shell 5G, so that the battery pack 13 can be detachably mounted. The battery pack mounting portion 14 is formed. A housing 6 having a trunk outer shell 4G and a grip outer shell 5G has two divided bodies (half-split bodies) 6L and 6R divided into two at the center in the direction perpendicular to the paper surface in FIGS. The corresponding end faces 6a, 6b are formed in a hollow shape by abutting each other.

  Protectors 15a, 15b, and 15c made of an elastic body are formed on the surface of the housing 6 including the boundary line between the two divided bodies 6L and 6R. By forming the protectors 15a, 15b, and 15c on the surface of the housing 6, the drill driver 1 is prevented from being damaged by being dropped or collided, and at the same time, from the impact at the time of dropping or colliding. The drill driver 1 itself can be protected.

  As shown in FIG. 3, locking portions 16 that protrude in the thickness direction of the housing 6 are formed at the longitudinal end portions 16 of the protectors 15 a, 15 b, and 15 c. According to such a configuration, the protectors 15a, 15b, and 15c are joined so as to wedge the housing 6 in the longitudinal end region, so that the protectors 15a, 15b, and 15c are formed even when the molding temperature is low. As a result, it is possible to prevent the protectors 15a, 15b, and 15c from peeling from the surface of the housing 6.

  The locking portion 16 is formed in a region other than the region near the minimum diameter portion (arrow portion shown in FIG. 1) of the grip portion outer shell 5G. According to such a configuration, the influence of the stress generated in the housing 6 due to the impact at the time of dropping or collision can be minimized, and the reliability can be improved.

  The locking portion 16 may have a substantially trapezoidal shape in which the longitudinal side surface portion is inclined in the longitudinal direction as shown in FIG. According to such a configuration, even when stress is applied to the protectors 15a, 15b, and 15c in the direction of peeling from the surface of the housing 6, the distal end portion of the locking portion 16 becomes a resistance so that the surface of the housing 6 The protectors 15a, 15b, and 15c are difficult to peel off.

  In the shape of the locking portion 16 shown in FIG. 4, as shown in FIG. 5, the longitudinal side surface portion may have a surface 17 parallel to the thickness direction of the housing. According to such a structure, since the front-end | tip part of the latching | locking part 16 becomes a wedge shape, the adhesiveness of the protectors 15a, 15b, 15c and the housing 6 can be improved more. Further, since the thickness of the housing to be pressed when the end portions of the protectors 15a, 15b and 15c on the housing 6 side are deburred is increased, the deburring operation is facilitated.

  The longitudinal side surface portion of the locking portion 16 may have a curved surface shape as shown in FIG. According to such a configuration, it is possible to relieve stress generated by an impact at the time of dropping or collision.

  As shown in FIGS. 7 and 8, a rectangular convex portion 18 may be formed on the side surface in the longitudinal direction of the locking portion 16. According to such a configuration, even when stress is applied to the protectors 15a, 15b, and 15c in the direction in which the protector 15a, 15b, and 15c is peeled off, the front end portion of the locking portion 16 becomes a resistance, thereby causing the housing 6 surface. Therefore, the protectors 15a, 15b, and 15c are difficult to peel off. Further, since the thickness of the housing 6 to be pressed when the end portions of the protectors 15a, 15b and 15c on the housing 6 side are deburred is increased, the deburring operation is facilitated.

  As shown in FIG. 9, the protectors 15a, 15b, and 15c are formed so as to protrude from the surface of the housing 6, and the surface height of the protector 6 is substantially the same as the surface height of the housing at the longitudinal end portion of the protector 6. An inclined portion 19 may be formed. According to such a configuration, when stress is generated in the creeping direction of the surface of the housing 6 due to a fingernail or other object, it is difficult to apply stress in the direction in which the protectors 15a, 15b, and 15c are peeled off from the surface of the housing 6. The protectors 15a, 15b, and 15c are difficult to peel from the surface of the housing 6. In addition, there is no sense of incongruity when gripping the grip portion outline 5G.

  As shown in FIG. 10, the surface height of the housing 6 at the longitudinal ends of the protectors 15a, 15b, 15c may be higher than the surface height of the protectors 15a, 15b, 15c. According to such a configuration, when stress is generated in the creeping direction of the housing surface by a fingernail or other object, it is difficult to apply stress in the direction of peeling the protector from the housing surface, so the protector is peeled off from the housing surface. It becomes difficult to do.

  As mentioned above, although the embodiment to which the invention made by the present inventors was applied has been described, the present invention is not limited by the description and the drawings that form part of the disclosure of the present invention according to this embodiment. That is, it should be added that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on the above embodiments are all included in the scope of the present invention.

It is a side view of the portable drill driver used as the embodiment of the present invention. It is the sectional side view of the drill driver which removed one housing of the drill driver shown in FIG. 1, and looked at the inside. It is a schematic diagram which shows the longitudinal direction edge part shape of the protector used as embodiment of this invention. It is a schematic diagram which shows the application example of the longitudinal direction edge part shape of the protector shown in FIG. It is a schematic diagram which shows the application example of the longitudinal direction edge part shape of the protector shown in FIG. It is a schematic diagram which shows the application example of the longitudinal direction edge part shape of the protector shown in FIG. It is a schematic diagram which shows the application example of the longitudinal direction edge part shape of the protector shown in FIG. It is a schematic diagram which shows the application example of the longitudinal direction edge part shape of the protector shown in FIG. It is a schematic diagram which shows the application example of the longitudinal direction edge part shape of the protector shown in FIG. It is a schematic diagram which shows the application example of the longitudinal direction edge part shape of the protector shown in FIG.

Explanation of symbols

1: Drill driver (portable power tool)
2: Electric motor 3: Drive mechanism 4G: Body shell 5G: Grip shell 6: Housing 6a, 6b: End face (edge)
13: Battery pack 14: Battery pack mounting portions 15a, 15b, 15c: Protector 16: Locking portion

Claims (8)

  An electric motor as a drive source, a speed reduction mechanism portion that transmits the rotational power of the electric motor, a drive portion that transmits the rotational power of the speed reduction mechanism portion to a tip tool, and a bearing portion that rotatably holds the drive portion are included. And a grip portion outer shell including a switch portion for controlling power supply to the electric motor, and the housing has a substantially cylindrical shape with the circumferential edges of the two divided bodies attached to each other. A portable power tool having a battery pack mounting portion formed at the front end in the longitudinal direction of the outer periphery of the grip portion, and a protector made of an elastic body covering the housing surface including the boundary line between the two divided bodies. The portable electric tool is characterized in that a locking portion protruding in the thickness direction of the housing is formed at the longitudinal end of the protector.   The portable electric tool according to claim 1, wherein a tip end portion of the locking portion has a substantially trapezoidal shape with a longitudinal side portion inclined.   The portable electric tool according to claim 2, wherein the side surface portion in the longitudinal direction has a surface parallel to the thickness direction of the housing.   The portable electric tool according to claim 1, wherein a longitudinal side surface portion of the locking portion has a curved shape.   The portable electric tool according to claim 1, further comprising a rectangular convex portion on a side surface in a longitudinal direction of the locking portion.   The portable power tool according to any one of claims 1 to 5, wherein the protector is formed so as to protrude from the surface of the housing, and a surface height of the protector is a housing at a longitudinal end portion of the protector. A portable electric tool characterized in that an inclined portion is formed so as to be substantially the same as the surface height of the.   The portable power tool according to any one of claims 1 to 5, wherein a surface height of the housing at a longitudinal end portion of the protector is higher than a surface height of the protector. Portable power tool.   The portable power tool according to any one of claims 1 to 7, wherein the protector is formed on an outer surface of the grip portion including a boundary line between two divided bodies, and a longitudinal end portion of the protector is formed on the outer surface of the grip portion. A portable electric tool characterized by being formed in a region other than a region in the vicinity of a minimum diameter portion of a grip portion outer shell.

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