JP2002331473A - Electric tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of uncomfortable feeling due to blowing of cooling air. SOLUTION: Bosses 8 and 8 forming screw holes 7 and 7 are projectingly provided in the vicinities of discharge ports 6, 6, etc., on both side surfaces of a housing 2. A grip 9 is screwed and mounted by holding a windbreak plate 12 in either one of the bosses 8 and 8. The windbreak plate 12 is a plate body constituted of a cover part 13 capable of covering the discharge ports 6, 6, etc., of the housing 2 over the entire surface and a mounting part 14 which is continuously provided at an end part of the cover part 13 and is provided with a through-hole 15. By passing a screw part 10 of the grip 9 through the through-hole 15 and screwing the screw part 10 into a screw hole 7, the mounting part 14 is held and fixed between the bosses 8 and the grip part 11 and the cover part 13 is stood with a clearance to the fronts of blowing directions of the discharge ports 6, 6, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power tool such as a polisher or a sander having a motor cooling air outlet formed on a side surface of a housing housing a motor.

[0002]

2. Description of the Related Art In a power tool such as a polisher or a sander, a cooling fan is fixed to an output shaft of a motor housed in a housing, and the rotation of the cooling fan accompanying the drive of the motor causes the cooling fan to rotate from an intake port provided in the housing. The motor is cooled by taking in cooling air, passing it through the housing, and exhausting it through an exhaust port also provided on the side surface of the housing. On the other hand, some of the power tools have a grip attached to a side of a housing for operating the tool. Therefore, if the mounting position of the grip is near the exhaust port, the cooling air whose temperature has increased due to the cooling of the motor hits the hand holding the grip, causing discomfort. In order to prevent the cooling air from touching the hand, a part of the exhaust port is closed with a closing member (for example, Japanese Utility Model Laid-Open No. 52-125784 and Utility Model Registration No. 251).
No. 6194), a guide member for changing the direction of exhaust is provided in the housing by using a screw or a locking structure, or simply by using elasticity (for example, Japanese Utility Model Laid-Open No. 52-125786 and Japanese Utility Model Laid-Open No. 55-55379). And the like.

[0003]

In the former structure in which the exhaust port is closed, the generation of discomfort due to the cooling air is prevented, but the cooling area of the exhaust port is reduced, so that the cooling effect of the motor is reduced. Would. In addition, the latter type, in which a guide member is provided, requires a separate structure for mounting to the housing, which leads to an increase in cost. In the case where the housing is elastically externally mounted, there is a risk of misalignment or disengagement, resulting in lack of reliability. .

[0004] Therefore, an object of the present invention is to provide an electric tool that can reliably prevent the occurrence of discomfort due to blowing of cooling air with a simple structure without affecting the cooling action. It is intended.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, the housing is gripped between the housing and the grip by screwing the grip between the housing and the grip. A windproof plate is provided in the holding and fixed state, which is located forward of the direction in which the cooling air is blown out from the exhaust port and which can prevent the blowing of the cooling air to the grip side. According to the second aspect of the present invention, in addition to the object of the first aspect, in a configuration in which a plurality of screw holes for mounting the grip are formed on the side surface of the housing and the mounting position of the grip can be selected, the configuration is rationalized. In order to achieve this, the windbreak plate can be held and fixed in such a position as to prevent the blowing of cooling air to the grip side at any mounting position of the grip.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a polisher. A polisher 1 projects a spindle that is rotated by driving a motor below a cylindrical housing 2 that houses a motor (not shown).
Wear it. A handle 4 is provided on one side surface of the housing 2 to extend orthogonally. Further, the housing 2
2 are formed on the end face opposite to the pad 3 in FIG. 2, while the left and right sides of the housing 2 near the pad 3 with the handle 4 therebetween are shown in FIG. As shown in FIG.
Are formed symmetrically. This exhaust port 6,6 ...
Is located at the outer peripheral position of the cooling fan fixed to the output shaft of the motor, and when the cooling fan rotates with the driving of the motor, the cooling air sucked from the intake ports 5, 5,. It is an outlet after passing through the inside and cooling the motor.

[0007] Bosses 8, 8 having screw holes 7, 7 are protruded between the exhaust ports 6, 6, ... and the pad 3 on both side surfaces of the housing 2, and the bosses 8, 8 are formed on the bosses 8, 8, respectively. The grip 9 can be mounted. The grip 9 has a screw portion 10 that can be screwed into the screw hole 7 and a grip portion 11 that is coaxial with the screw portion 10. By screwing the screw portion 10 into one of the screw holes 7, 7. The grip portion 11 is mounted orthogonally to the handle 4 from the side surface of the housing 2.
The reason why one of the bosses 8, 8 is selected and the grip 9 can be attached to one of the bosses 8 or 8 is in consideration of usability such as the dominant hand of the operator and the use situation.

In this case, however, a windbreak plate 12 is interposed between the boss 8 of the housing 2 and the grip portion 11. The windproof plate 12 is provided with the exhaust ports 6, 6,.
And a mounting portion 1 provided with a through-hole 15 and connected to an end of the cover portion 13 so as to cover the entire surface.
4 in an L-shaped flat plate body, with the cover part 13 positioned forward in the blowing direction of the exhaust ports 6, 6,.
By screwing the screw portion 10 of the grip 9 through the through hole 15 and screwing it into the screw hole 7, the mounting portion 14 is held and fixed between the boss 8 and the grip portion 11 as shown in FIGS. In this state, the cover portion 13 stands upright at right angles to the grip 9 with a gap forward in the blowing direction of the exhaust ports 6, 6,. Further, the mounting portion 14 is provided with arc-shaped ribs 16, 16 concentric with the through hole 15 and erected substantially symmetrically on both left and right surfaces.

In the polisher 1 configured as described above, when performing a polishing operation, the polisher 1 is operated while holding the handle 4 and the grip 9. Here, even when the cooling air is blown out from the exhaust ports 6, 6,... As described above with the driving of the motor, as shown by the dotted arrows in FIG. Or, since it is divided into any one of the left and right directions and the blowing to the grip 9 side is prevented, the cooling air does not hit the operator's hand,
No discomfort occurs. Then, the grip 9 is attached to the housing 2
In the case where the windshield 12 is screwed into the boss 8 on the opposite side, as shown in FIG. Therefore, the cooling air blown out from the exhaust ports 6, 6,... On the relevant side is blocked by the cover portion 13, and does not hit the operator's hand.

When the grip portion 11 is loosened due to the replacement of the grip 9 or the like, the windbreak plate 12 held between the housing 2 and the housing 2 is rotated to the side by the weight of the cover portion 13. 3 abuts against the bulging side surface of the housing 2 to restrict the rotation of the windbreak plate 12 at the position indicated by the two-dot chain line in FIG. 3. There is no fear.

As described above, according to the polisher 1 of the above-described embodiment, the gripper 9 is fixedly held between the housing 2 and the grip 9 by screwing the grip 9 between the housing 2 and the exhaust port. By providing the windbreak plate 12 positioned in front of the direction of the blowing of the cooling air from 6, 6,..., The generation of discomfort due to the blowing of the cooling air can be reliably prevented. In addition, utilizing the mounting structure of the grip 9, the windproof plate 1 is simultaneously mounted with the screw 9.
Since the housing 2 and the grip 9 have a reasonable structure, the housing 2 and the grip 9 do not undergo any shape change, and the cost can be reduced. Of course, since the openings of the exhaust ports 6, 6,... Are maintained as they are, the cooling operation of the motor is not affected. In this embodiment, screw holes 7, 7 are formed on the left and right side surfaces of the housing 2 so that the mounting position of the grip 9 can be selected. Because it is possible to hold and fix it in a position that prevents blowing of cooling air to the side,
Regardless of the mounting position of the grip 9, the configuration can be rationalized by using the same windproof plate 12.

The shape of the windbreak plate is not limited to the above-described embodiment.
The design can be changed as appropriate, such as a fan shape or disk shape, according to the arrangement of the exhaust port and the opening area, and furthermore, without completely separate from the grip,
It may be mounted on the screw part of the grip in a rotatable state. Further, in the above embodiment, the screw portion of the grip is loosely inserted into the through hole provided in the windproof plate. However, a notch may be used instead of the through hole, so that it can be held and fixed between the housing and the grip. For example, the design of the portion to be held on the windbreak plate side can be changed. However, it is preferable to use the through-holes as in the above embodiment, since the positioning of the windproof plate is easy and there is no risk of falling off during attachment and detachment. The present invention is not limited to a polisher or a sander, but can be applied to other electric tools such as an electric hammer and a hammer drill as long as a grip is mounted near an exhaust port provided on a side surface of a housing. is there.

[0013]

According to the first aspect of the present invention, the windbreak plate fixedly held between the housing and the grip provides:
Generation of discomfort due to blowing of the cooling air can be reliably prevented. Also, using the mounting structure of the grip originally,
Since it has a rational structure in which the windbreak plate is clamped and fixed at the same time as the screw-in mounting of the grip, there is no change in the shape of the housing or the grip, and the cost can be reduced. Of course, since the opening of the exhaust port is maintained as it is, it does not affect the cooling function of the motor. According to the second aspect of the present invention, in addition to the effect of the first aspect, a plurality of screw holes for mounting the grip are formed on the side surface of the housing so that the mounting position of the grip can be selected. Windproof board,
The same windbreak plate can be used regardless of the mounting position of the grip, so that the configuration can be streamlined by allowing the gripping position to prevent cooling air from blowing to the grip side at any mounting position. Can be.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a polisher.

FIG. 2 is an explanatory front view of a polisher equipped with a grip.

FIG. 3 is an explanatory side view of a polisher equipped with a grip.

FIG. 4 is an explanatory front view of a polisher with a grip mounted on the opposite side.

[Explanation of symbols]

1. Polisher, 2. Housing, 5. Inlet,
6 ... Exhaust port, 7 ... Screw hole, 9 ... Grip, 10 ...
・ Screw, 11 ・ Grip, 12 ・ Windboard, 13
..The cover part, the mounting part, the through hole.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Fumiyo Numata 3-11-8 Sumiyoshicho, Anjo-shi, Aichi F-term in Makita Co., Ltd. (reference) 3C058 AA04 AA06 AC01

Claims (2)

[Claims] 1. A side face of a housing containing a motor,
An electric tool having an outlet for cooling air for the motor formed therein, and an operating grip screwed in and mounted near the outlet, wherein the grip is screwed between the housing and the grip. The cooling air is held and fixed between the housing and the grip, and in the holding and fixed state, the cooling air can be prevented from being blown toward the grip by being positioned forward in the blowing direction of the cooling air from the exhaust port. An electric tool characterized by providing a simple windbreak plate. 2. In a device in which a plurality of screw holes for grip mounting are formed on a side surface of a housing so that a mounting position of the grip can be selected, a windproof plate is provided on the grip side at any mounting position of the grip. The power tool according to claim 1, wherein the power tool can be held and fixed in a posture in which blowing of cooling air to the air is prevented.