JP2008044024A - Portable power tools - Google Patents

Abstract

To provide a portable electric tool having good operability and high designability.
A motor is provided inside a body portion of a housing having a substantially cylindrical body portion and a handle portion connected to form a substantially T shape in a side view. A switch for controlling the supply of electric power inside the handle portion 2B, accommodating a transmission mechanism portion for transmitting the driving force of the motor and an anvil (tip tool holding portion) 16 for transmitting the driving force of the motor from the transmission mechanism portion. The anvil 16 is partially protruded forward from the front end of the body portion 2A of the housing 2, and the body portion 2A is formed in a tapered shape whose outer diameter decreases toward the front end portion from which the anvil 16 protrudes. In the impact driver (portable tool) 1 as described above, an ellipse having a convex portion 22 on the side surface of the front surface of the body portion 2A and having a vertical length of at least 13 mm at the central portion of the convex portion 22. Forming a recess 22a.
[Selection] Figure 1

Description

  The present invention relates to a portable power tool having a so-called T-shaped handle.

  An impact driver as an example of a conventional portable electric tool will be described with reference to FIGS. 9 is a side view of a conventional impact driver, and FIG. 10 is a side sectional view showing an internal structure of the impact driver.

  The impact driver 1 ′ shown in FIGS. 9 and 10 includes a housing 2 that is an outer frame that forms an outer shape and a hammer case 3 that is a cover member. The housing 2 has a substantially cylindrical body that extends in the front-rear direction. A portion 2A and a handle portion 2B connected to the body portion 2A so as to form a substantially T shape in a side view. In the body 2A of the housing 2, a motor 4 as a driving source, a planetary gear mechanism 5 for decelerating the rotation of the motor 4, and the rotation of the motor 4 decelerated by the planetary gear mechanism 5 are rotated. A rotary impact mechanism that converts the impact force into a bit 6 that is a tip tool is incorporated. A plurality of wind windows 7 are formed behind the body portion 2A of the housing 2 (left side in FIG. 10).

  Further, as shown in FIG. 10, a switch 9 having a trigger 8 at the upper portion and a battery receiving portion 10 at the lower portion are accommodated inside the handle portion 2B of the housing 2, and the lower end of the handle portion 2A is charged. A battery 11 as a possible power source is detachably mounted.

  Thus, in such an impact driver 1 ′, when the operator activates the trigger 8 to start the motor 4, the rotation of the output shaft (motor shaft) 4 a of the motor 4 is decelerated by the planetary gear mechanism 5. Is transmitted to the spindle 12, and the spindle 12 is rotationally driven at a predetermined speed. Here, the spindle 12 and the hammer 13 are connected by a cam mechanism. The cam mechanism is formed on the V-shaped spindle cam groove 12 a formed on the outer peripheral surface of the spindle 12 and the inner peripheral surface of the hammer 13. It comprises a V-shaped hammer cam groove 13a and balls 14 that engage with these cam grooves 12a, 13a.

  The hammer 13 is always urged by the spring 15 in the tip direction (to the right in FIG. 10). When the hammer 13 is stationary, the ball 14 and the cam grooves 12a and 13a are engaged to separate the end face of the anvil 16 from the gap. In the position. And the convex part is each symmetrically formed in two places on the rotation plane which the hammer 13 and the anvil 16 oppose. The anvil 16 is detachably mounted with the bit 6 as a tip tool.

  By the way, when the spindle 12 is rotationally driven at a predetermined speed as described above, the rotation of the spindle 12 is transmitted to the hammer 13 through the cam mechanism, and the hammer 13 is not rotated halfway before the hammer 13 is rotated halfway. The protrusion 13 is engaged with the protrusion of the anvil 16 and the anvil 16 is rotated. When the relative reaction force is generated between the hammer 13 and the spring 15 by the engagement reaction force at that time, the hammer 13 Then, the spring 15 is compressed along the spindle cam groove 12a of the cam mechanism and starts to move backward toward the motor 4 side.

  When the protrusion of the hammer 13 moves over the protrusion of the anvil 16 due to the backward movement of the hammer 13 and the engagement between the two is released, the hammer 13 accumulates in the spring 15 in addition to the rotational force of the spindle 12. While being accelerated rapidly in the rotational direction and forward by the action of the elastic energy and the cam mechanism, it is moved forward by the urging force of the spring 15, and its convex part is re-engaged with the convex part of the anvil 16 to be integrated. Begin to rotate. At this time, since a strong rotational impact force is applied to the anvil 16, the rotational impact force is transmitted to a screw (not shown) via the bit 6 attached to the anvil 16.

  Thereafter, the same operation is repeated, and the rotational striking force is intermittently and repeatedly transmitted from the bit 6 to the screw, and the screw is screwed into a material to be fastened such as wood.

  By the way, in such a hand-held impact driver 1 ′, the operability and workability can be improved by improving the anti-slip or grip feeling of the operator's fingers grasping the body 2A and the handle 2B of the housing 2. For the purpose of improvement, as shown in FIG. 9, a soft layer (shaded portion) 18 made of an elastomer that is softer than the hard layer 17 is formed on the housing 2 as a whole. Further, a protector 19 made of a soft elastomer or the like is attached to the front side of the body portion 2A of the housing 2 by a stopper 21, and this protector 2A prevents damage to a material to be fastened such as a building material and makes the impact driver 1 'an inclined surface. It is designed to function as a slipper when placed.

  Patent Document 1 proposes a configuration in which a convex portion is formed on a side surface within 7 cm rearward from the tip of the tip tool holding portion of the housing of the impact driver. When the bit attached to the pin is pinched and applied to the material to be fastened, the hand is caught and it becomes difficult to slide, and the operability is improved.

In Patent Document 1, a soft layer provided so as to protrude from the housing is connected so that the rear and lower sides of the handle portion, the lower portion of the handle portion and the front of the trunk portion, and the front and rear of the trunk portion are connected to each other. Proposals have been made to provide a single housing integrally. According to this, only one gate is required for the molding die of the housing, and therefore, resin is not left in many gates and is not wasted.
JP 2005-199406 A

  By the way, when using a portable tool having a striking mechanism such as the impact driver 1 ′ shown in FIGS. 9 and 10, as shown in FIG. 11, the side projection 20 on the body portion 2A of the impact driver 1 ′ is used. The impact driver 1 'is held with a finger. Specifically, in order to stabilize the bit 6 that is the tip tool, there are cases where the second finger of the operator's hand is attached to the side surface of the body portion 2A and the trigger 8 is pulled with the third finger. At this time, a plurality of corrugated convex portions 20 are provided on the surface of the protector 19 to which the second finger is attached. These convex portions 20 are provided on the side surfaces of the protector 19 in the left-right direction in order to enhance the anti-slip effect. Surface), the height is set to about 0.5 mm to 1 mm.

  However, there is a problem that the height of the convex portion 20 is insufficient and the finger is not easily hooked because the interval is narrow, and it is easy to slip.

  Moreover, in order to form the convex part 20 on the surface of the protector 19, there is a problem that the die of the die must be divided and the die cost becomes high.

  Further, when the soft layers 18 provided so as to protrude from the housing 2 are integrally provided in one housing 2 so as to be connected to each other, compared with the case where the soft layers 18 are divided and provided, the appearance is light. There was also a problem that the designability was low.

  The present invention has been made in view of the above problems, and the object of the present invention is that the portable electric motor is easy to operate and has a high design when it is difficult to slip when a finger is attached to the front side of the body portion of the housing. To provide a tool.

  In order to achieve the above-mentioned object, the invention according to claim 1 is a housing having a substantially cylindrical body portion extending in the front-rear direction and a handle portion connected to the body portion so as to form a substantially T shape in a side view. The body portion accommodates a motor as a driving source, a transmission mechanism portion for transmitting the driving force of the motor, and a tip tool holding portion for transmitting the driving force of the motor from the transmission mechanism portion, and the handle. A switch for controlling the supply of electric power is accommodated inside the part, and the tip tool holding part projects partially forward from the tip of the body part of the housing, and the tip tool holding part projects from the body part. In the portable tool formed in a tapered shape whose outer diameter decreases toward the leading end portion, a convex portion is provided on a side surface of the surface over the leading end portion of the body portion, and a vertical portion is provided at the central portion of the convex portion. At least 13mm in length And characterized by forming a recess of a oval.

  According to a second aspect of the present invention, in the first aspect of the present invention, a soft layer is provided on the convex portion.

  According to a third aspect of the present invention, in the second aspect of the present invention, the housing is configured by joining and integrating a housing divided into left and right parts, and continuous from the convex part to the upper part of the body part. The soft layer is provided so as to come into contact with the mating surfaces of the left and right housings.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, a soft layer is provided on the convex portion so as to be continuous with a soft layer provided on another portion of the housing. To do.

  According to a fifth aspect of the present invention, in the invention according to any one of the second to fourth aspects, a cylindrical cover member is attached to the outside of the distal end portion of the body portion of the housing, and the convex portion is formed by at least a part of the cover member. A portion for connecting the soft layer provided in the portion and the soft layer provided in the other portion of the housing is covered.

  According to the first aspect of the present invention, a convex portion is provided on the side surface of the front surface of the body portion, and an elliptical recess having a vertical length of at least 13 mm is formed in the central portion of the convex portion. When the operator pulls the trigger with the third finger, the second finger can be easily attached to the dent of the convex portion and it is difficult to slip, the tip tool can be stabilized, and the operability is improved.

  According to the second aspect of the present invention, since the soft layer is provided on the convex portion, the effect of the slip prevention by the convex portion is enhanced, and even when the portable tool is placed sideways, the trunk portion is It is possible to prevent scratches caused by direct contact with the ground or the like.

  According to the third aspect of the present invention, the housing is configured by joining and integrating the housing divided into the left and right parts, and the soft layer continuously provided from the convex part to the upper part of the body part is provided on the left and right housings. Since it provided so that it might contact in a mating surface, while protecting the trunk | drum and a building material, the design property is improved because it looks like one part including the convex part on either side covered the trunk | drum.

  According to the fourth aspect of the present invention, since the soft layer connected to the soft layer provided in the other part of the housing is provided on the convex portion, the gate of the mold is compared with the case where the soft layer is provided independently. The number can be reduced, and the mold cost can be reduced to reduce the production cost.

  According to the fifth aspect of the present invention, the soft layer provided on the convex portion and the soft layer provided on the other portion of the housing are connected to at least a part of the cover member attached to the outside of the front end portion of the body portion of the housing. Since the portion to be covered is covered, the soft layer provided on the convex portion appears to be separated from the soft layer provided on the other portion of the housing, and the appearance is light and the design is enhanced.

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

  FIG. 1 is a side view of an impact driver as an embodiment of a portable electric tool according to the present invention, FIG. 2 is a front view of the impact driver, FIG. 3 is a side sectional view showing an internal structure of the impact driver, and FIG. FIG. 5 is a cross-sectional view taken along line AA in FIG. 4 and FIG. 6 is a tightening material for the tip tool of the impact driver. FIG. 7 is an exploded side view showing a state in which a stopper and a protector are removed from the housing of the impact driver.

  As shown in FIG. 3, the impact driver 1 according to the present embodiment includes an anvil 16 that is a tip tool holding portion inside a housing 2 that is an outer frame that forms an outer shape and a hammer case 3 that is a cover member. A motor 4 that is a drive source disposed coaxially with the anvil 16; a planetary gear mechanism 5 that is a transmission mechanism that decelerates and transmits the rotation of the output shaft (motor shaft) 4a of the motor 4; The impact mechanism portion composed of the spindle 12 and the hammer 13 that rotate by receiving the rotational force from the gear mechanism 5 is accommodated, and the hammer 13 rotates and strikes the anvil 16 and the bit 6 that is a tip tool attached thereto. Is. The other configurations and operations of the impact driver 1 according to the present invention excluding the housing 2 are the same as those of the conventional impact driver 1 ′ shown in FIGS. The same elements are denoted by the same reference numerals, and repetitive description thereof will be omitted below.

  The characteristic configuration of the present invention will be described below.

  As shown in FIG. 1, the housing 2 has a substantially cylindrical body portion 2A extending in the front-rear direction, and a handle portion 2B connected to the body portion 2A so as to form a substantially T shape in a side view. Yes. As shown in FIG. 2, the housing 2 is divided into a left housing 2a and a housing 2b. The housings 2a and 2b are joined and integrated by screws (not shown). As shown in FIG. 1, the housing 2 is formed with a body portion 2A and a handle portion 2B depending on the body portion 2A. The housing 2A is rearward of the body portion 2A (right side in FIG. 1, left side in FIG. 3). 3), a plurality of wind windows 7 are formed. Inside the handle portion 2B, as shown in FIG. 3, a switch 9 having a trigger 8 at the upper portion and a battery receiving portion 10 at the lower portion are accommodated. A battery 11 that is a rechargeable power source is detachably attached to the lower end of the portion 2B.

  As shown in FIG. 1, the housings 2a and 2b divided into right and left are formed on a hard layer 17 formed by injection molding nylon resin or the like, and a soft layer 18 made of elastomer or the like that is softer than the hard layer 17. Is formed by injection molding and heat welding.

  The area of the soft layer 18 occupies about 60% or more of the entire housing 2 when viewed from the direction of FIG. 1, and the soft layer 18 is formed on the housing 2 from the entire handle portion 2B to the lower portion of the body portion 2A. The lower part of the body part 2A is connected to the rear part of the body part 2A and the front side surface of the body part 2A, and the front side surface of the body part 2A is connected to the upper part of the body part 2A. Similarly, the other housing 2b is provided with the soft layer 18 so as to be almost symmetrical with the housing 2a.

  As described above, since the soft layer 18 is partially formed on the surfaces of the housings 2a and 2b, even if the housing 2 comes into contact with the surrounding building material W (see FIG. 6) or the like, the soft layer 18 is not formed. By interposing them in between, they do not hurt each other or break. In addition, since the soft layers 18 are connected and integrated, the number of gates that are passages for feeding the material in the mold of the soft layer 18 into the mold can be reduced, and the number of the molds can be reduced, for example. It can be reduced to one.

  Next, a configuration in front of the body portion 2A of the housing 2 will be described.

  An aluminum alloy hammer case 3 (see FIGS. 3 and 7), which is a part of the body portion 2A and is a cylindrical cover member provided in front of the housing 2, has an outer surface made of a soft material such as an elastomer. It is covered with a protector 19 that is a frame. This protector 19 is fixed to the hammer case 3 by a stopper 21 which is a fixing means having elasticity, and a fitting recess (not shown) provided inside the stopper 21 is fitted to a hammer case 3 (not shown). It is securely fixed by engaging the mating convex portion. The protector 19 has a function of preventing the hammer case 3 and the building material W from being damaged and a function of preventing slipping and heat of the hammer case 3.

  The hammer case 3 and the protector 19 are formed in a tapered shape in which the outer diameter gradually decreases from the rear toward the front, and an anvil 16 that is a tip tool holding portion protrudes from the tip of the hammer case 3. A bit 6 as a tip tool is detachably attached. Here, the reason why the hammer case 3 and the protector 19 are tapered is that they do not get in the way in narrow work and that the tip of the bit 6 is easy to see when viewed from behind.

  Thus, the present invention is characterized in that a pair of left and right substantially elliptical convex portions 22 are provided on the side surface of the body portion 2A of the housing 2, and each convex portion 22 has a height of 0.5 mm to 0.7 mm. A recess 22 a is formed at the center of each protrusion 22.

  Then, as shown in FIG. 5, if the vertical length L of the recess 22a at the center of each convex portion 22 is at least 13 mm, the operator triggers with the third finger of the right hand as shown in FIG. When the second finger is attached to the side surface of the body portion 2A when pulling 8, the finger is difficult to slip because the finger is caught in the central recess 22 a of the convex portion 22, and the impact driver 1 is difficult to swing laterally. Become.

  Further, as shown in FIG. 5, the soft layer 18 is formed on the body portion 2A where the building material W is easy to contact so as to continue from the convex portion 22 of one housing 2a to the convex portion 22 of the other housing 2b. As a result, it is possible to prevent the building material W from being damaged due to the surface of the hard layer 17 coming into contact with the building material W during work, and to absorb the impact when the impact driver 1 is dropped on the ground, thereby absorbing the impact driver. 1 damage can be prevented. As shown in FIG. 5, the soft layer 18 is connected to the upper part of the body part 2A from the convex part 22 provided on each side part of the divided left and right housings 2a and 2b. Are provided so as to contact each other at the mating surfaces of the housings 2a and 2b.

  Then, by providing the soft layer 18 as described above, it looks as if one part including the left and right convex portions 22 is covered on the body portion 2A, so that the design of the impact driver 1 is enhanced.

Then, as shown in FIG. 6, when the operator holds the bit 6 attached to the impact driver 1 with his left hand and applies it to the screw 23, the projections 22 formed on the left and right sides of the body portion 2 </ b> A of the housing 2 are respectively fourth. Since the finger tip and the base part of the first finger are caught, the finger becomes difficult to slip, so that the operability is improved. In the present embodiment, as shown in FIG. 17, the soft layer 18 a can be connected to the soft layer 18 b formed in another region via the soft layer 18 c, so that the soft layer 18 a is connected to the surface of the soft layer 18 c. Compared to the case where the two are independent, the number of gates of the mold can be reduced, and the mold cost can be reduced to reduce the production cost. Further, since it seems that the convex portion 22 and the soft layer 18a continuously provided above the convex portion 22 are separated from the soft layer 18b formed in the other region of the housing 2, a light feeling is obtained. Designability is enhanced.

  Although the present invention has been described with respect to the embodiment in which the present invention is applied particularly to a cordless impact driver having a rechargeable battery, the present invention is similarly applied to a corded impact driver 1 '' shown in FIG. In addition, the present invention is not limited to application only to impact drivers, and is naturally applicable to a wide range of other portable tools such as circular saws and nailers.

It is a side view of the impact driver which concerns on this invention. It is a front view of an impact driver concerning the present invention. It is a sectional side view which shows the internal structure of the impact driver which concerns on this invention. It is a side view which shows the state hold | gripped and applied the finger | toe to the convex part of the trunk | drum side surface of the impact driver which concerns on this invention. It is the sectional view on the AA line of FIG. It is a perspective view which shows the state which applies the front-end tool of the impact driver which concerns on this invention to a to-be-clamped material. It is a disassembled side view which shows the state which removed the stopper and protector from the housing of the impact driver which concerns on this invention. It is a side view of the impact driver with a cord concerning the present invention. It is a side view of the conventional impact driver. It is a sectional side view which shows the internal structure of the conventional impact driver. It is a side view which shows the state hold | gripped and applied the finger | toe to the convex part of the trunk | drum side surface of the conventional impact driver.

Explanation of symbols

1,1 "impact driver (portable tool)
2 Housing 2A Housing Body 2B Housing Handle 2a, 2b Divided Housing 3 Hammer Case (Cover Member)
4 Motor (drive source)
4a Motor output shaft (motor shaft)
5 Planetary gear mechanism (transmission mechanism)
6 bits (tip tool)
7 Wind window 8 Trigger 9 Switch 10 Battery receiving part 11 Battery 12 Spindle 12a Spindle cam groove 13 Hammer 13a Hammer cam groove 14 Ball 15 Spring 16 Anvil (tip tool holding part)
17 Hard layer 18 Soft layer 19 Protector 20 Convex part 21 Stopper 22 Convex part 22a Concave 23 Screw W Building material

Claims (5)

A motor as a drive source in the body portion of the housing having a substantially cylindrical body portion extending in the front-rear direction and a handle portion connected to the body portion so as to form a substantially T shape in a side view, and the motor A transmission mechanism that transmits the driving force of the motor, a tip tool holding portion that transmits the driving force of the motor from the transmission mechanism, and a switch that controls the supply of power is accommodated inside the handle. The tip tool holding portion is partially protruded forward from the tip of the body portion of the housing, and the body portion is formed in a tapered shape whose outer diameter decreases toward the tip portion from which the tip tool holding portion protrudes. In the portable tool consisting of
A portable tool characterized in that a convex portion is provided on a side surface of the surface over the tip of the body portion, and an elliptical recess having a vertical length of at least 13 mm is formed in the central portion of the convex portion.   The portable tool according to claim 1, wherein a soft layer is provided on the convex portion.   The housing is configured by joining and integrating a housing divided into left and right parts, and the soft layer continuously extending from the convex part to the upper part of the body part is brought into contact with a mating surface of the left and right housings. The portable tool according to claim 2, wherein the portable tool is provided as described above.   The portable tool according to any one of claims 1 to 3, wherein a soft layer connected to a soft layer provided on another portion of the housing is provided on the convex portion.   A cylindrical cover member is attached to the outside of the front end of the body portion of the housing, and the soft layer provided on the convex portion and the soft layer provided on the other portion of the housing are connected to at least a part of the cover member. The portable tool according to claim 2, wherein a portion to be covered is covered.

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