JP4396447B2 - Electric tool - Google Patents

Description

  The present invention relates to a power tool provided with a cover that covers an outer frame, and more particularly to a structure for fixing the cover to the outer frame.

  The power tool is provided with a cover that covers the outer frame in order to prevent the outer frame from being damaged or to prevent the heat of the outer frame from being directly transmitted to the hand when the outer frame is touched by hand. Since the cover is not necessarily a component required when using the electric tool, it is generally provided so as to be detachable from the tool body. Also, the cover is often sold as an optional part to the tool body, not as an accessory part. Under such circumstances, a structure in which the cover can be easily attached to and detached from the tool body is desirable. As a structure for fixing the cover to the outer frame, there is a structure described in Patent Document 1, for example.

  Patent Document 1 generally describes the following. That is, after inserting a cover so that the outer periphery of the hammer case which is an outer frame may be covered, the stopper which is a fixing means is attached to a hammer case. The stopper has elasticity, and by engaging the fitting recess provided in the stopper with the fitting protrusion provided in the hammer case, the stopper and the stopper can be reliably positioned so as not to be detached.

Japanese Laid-Open Patent Publication No. 2003-245865

  In the structure described in Patent Document 1, a stopper, which is a separate part, is required to fix the cover, so that the number of parts increases and the cost increases. Moreover, although it is necessary to provide a fitting convex part in an outer frame in order to engage a stopper with an outer frame, since this fitting convex part is exposed when a cover is removed, design property is impaired.

  An object of the present invention is to provide a cover that does not require a separate part for fixing and does not require any special structure in the tool body for fixing, and an electric tool having this cover.

  An electric motor comprising: a motor; a housing that houses the motor and has a vent; a transmission mechanism that transmits the driving force of the motor; a gear case that houses the transmission mechanism; and a cover that covers the gear case In the tool, the cover is configured to have a convex portion that engages with the vent. If it does in this way, a cover can be detachably attached to a gear case by latching a convex part to a vent hole.

  According to the structure of Claim 1, a cover can be attached to a gear case so that attachment or detachment is possible by latching a convex part to a vent hole. Therefore, it is possible to provide a cover that does not require a separate part for fixing and does not require a special structure in the tool body for fixing, and a power tool having the cover.

<First Embodiment>
A power tool according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4.

  As shown in FIG. 1, an electric screwdriver 1 that is an example of an electric tool includes a resin housing 2 that is an outer frame, and an aluminum alloy gear case 4 that is another outer frame attached to one end of the housing 2. And a cover 3 made of rubber or synthetic resin for covering the gear case 4. In the vicinity of the gear case 4 of the housing 2, a vent 2 a is formed so as to penetrate from the inside of the housing 2 to the outside.

  A plurality of extending portions 3a extending to the vent hole 2a are formed at one end of the cover 3 on the housing 2 side. As shown in FIGS. 3 and 4, the projecting portion 3 b that can be engaged with the vent 2 a is formed so as to protrude inward from the tip of each extending portion 3 a.

  FIG. 3 shows an example in which an allowance is provided between the convex portion 3b and the vent 2a so that the convex portion 3b does not easily come out of the vent 2a due to a frictional force therebetween. . In order to attach the cover 3, the cover 3 is put on the gear case 4 from the front of the electric driver 1 (left side in FIG. 1), and the convex portion 3b is press-fitted into the vent hole 2a. Thereby, the extension part 3a is fixed to the housing 2, and the cover 103 does not fall off unless the convex part 3b is removed from the vent hole 2a.

  Also, FIG. 4 shows that the claw portion 3c is formed at the tip of the convex portion 3b, and when the convex portion 3b tries to come out, the claw portion 3c is caught by the vent 2a, so that the convex portion 3b is easily dropped from the vent 2a An example configured so as not to be performed is shown. In order to attach the cover 3, the cover 3 is put on the gear case 4 from the front of the electric driver 1 (left side in FIG. 1), and the projection 3b is inserted into the vent 2a while the claw 3c is deformed. Pass to the inside of the vent 2a. Thereby, the extension part 3a is fixed to the housing 2, and the cover 103 does not fall off unless the convex part 3b is removed from the vent hole 2a.

  3 and 4, the cover 3 is attached to the gear case 4 without any other parts, and a special structure for fixing the cover 3 to the housing 2 and the gear case 4. There is no need to provide. This method is also effective in the case where it is desired to attach the cover 3 later in a tool that was originally designed without taking the cover 3 into consideration. In addition, the gear case 4 is heated to a high temperature by being transmitted from an internal mechanism, and in the worst case, the cover 3 is thermally deformed. The part 3b is cooled by the cooling air. For this reason, the convex part 3b and the extension part 3a are hard to deform | transform, and can prevent it stably.

  In addition, you may comprise so that the convex part 3b of the cover 3 may be latched in the other hole and groove | channel formed in the housing 2 not only in the vent hole 2a.

  The cover 3 is formed of a transparent or translucent synthetic resin. By doing so, the surface of the gear case 4 made of aluminum alloy can be seen from the outside, so that a robust image is received.

<Second Embodiment>
The power tool according to the second embodiment will be described with reference to FIGS.

  In this embodiment, in order to more securely fix the cover 103 to the gear case 104, a screw 106 is used as a separate part from the cover 103. The cover 103 is provided with an extending portion 103a extending toward the housing 102 and a through hole 103d formed in the extending portion 103a. The housing 102 is provided with a screw hole 102b screwed with a screw 106 at a position corresponding to the through hole 103d.

  To attach the cover 103, the cover 103 is put on the gear case 104 from the front of the electric driver 101 (left side in FIG. 5), and the screw 106 is inserted through the through hole 103d and screwed into the screw hole 102b. As a result, the extension 103a is securely fixed to the housing 102, and the cover 103 does not fall off unless the screw 106 is loosened and removed.

  In this embodiment, it is necessary to provide the screw hole 102b on the tool body side, but the screw hole 102b is formed by drilling a pilot hole in the housing 102 after molding and screwing with a tap. . It is not necessary to provide a special structure for fixing the cover 103 to the mold of the housing 102. This method is effective in the case where it is desired to attach the cover 103 later in a tool that was originally designed without taking the cover 103 into consideration.

The front view of the electric driver which concerns on the 1st Embodiment of this invention. FIG. 2 is a partial cross-sectional view taken along line AA in FIG. 1. The figure which shows the example which press-fit the convex part in the vent hole in the B section enlarged view of FIG. The figure which shows the example which latched the nail | claw part to the vent hole in the B section enlarged view of FIG. The front view of the electric driver which concerns on the 2nd Embodiment of this invention. FIG. 6 is a partial cross-sectional view taken along line CC in FIG. 5. The D section enlarged view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,101 Electric driver 2,102 Housing 2a Vent 102b Screw hole 3,103 Cover 3a, 103a Extension part 3b Convex part 3c Claw part 103d Through hole 4,104 Gear case 106 Screw

Claims (1)

A motor,
A housing that houses the motor and has a vent;
A transmission mechanism for transmitting the driving force of the motor;
A gear case that houses the transmission mechanism;
A cover covering the gear case;
In the electric tool with
The power tool, wherein the cover has a convex portion that engages with the vent.

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