Cover for Portable Machining Device and Portable Machining Device

This application claims the benefit of Chinese Patent Application Number 202410692073.5 filed on May 30, 2024, the entirety of which is incorporated by reference.

The disclosure relates to a cover for a portable machining device, such as a wheel sander, and a portable machining device.

As illustrated inof EP 2548697 A, there has been known a wheel sander including a cover.

The coverin EP 2548697 A is provided around a wheel-shaped tool. The coverintegrally includes an exhaust unitand a brush.

In the wheel sander, when a cover without the exhaust unitis to be used, the whole cover needs to be replaced.

The description discloses a cover for a portable machining device. The cover may include a main cover that covers a part or whole of an upper side of a tip tool of the portable machining device. The cover may include an auxiliary cover that is separable from the main cover and covers a part or whole of a rear side of the tip tool. The auxiliary cover may be removably attachable.

According to the portable machining device and the cover of the disclosure, the cover facilitated in handling and the portable machining device including the cover are provided.

In one embodiment of the disclosure, the auxiliary cover may be removably attachable to the main cover. In the case, a cover from which only the auxiliary cover is removable is simply configured by providing an attachment portion of the auxiliary cover to the main cover.

In one embodiment of the disclosure, the auxiliary cover may hold the main cover. Alternatively, the main cover may hold the auxiliary cover. In the case, the auxiliary cover can be toollessly attached.

In one embodiment of the disclosure, the cover may include a brush separable from the main cover and the auxiliary cover. The brush may be removably attachable. In the case, the user can select whether to provide the brush.

In one embodiment of the disclosure, the auxiliary cover may hold the brush. Alternatively, the brush may hold the auxiliary cover. In the case, the brush can be toollessly attached.

In one embodiment of the disclosure, the main cover may be removably attached to a handle portion of the portable machining device. In the case, the mounting portion of the main cover is more simply configured.

In one embodiment of the disclosure, the auxiliary cover may be provided with a dust discharge port. In the case, the dust is more easily discharged. The auxiliary cover can be connected to a dust collector or a dust bag.

In one embodiment of the disclosure, the cover may include a lid removably attachable to the dust discharge port. In the case, when it is not necessary to discharge the dust, passing through of the dust from the dust discharge port is suppressed.

In one embodiment of the disclosure, an attachment angle of the auxiliary cover to the main cover may be adjustable. In the case, the attachment angle of the cover can be adjusted corresponding to the dust scattering direction. Accordingly, scattering of the dust is more suppressed.

In one embodiment of the disclosure, the tip tool may be removably attachable. At least one of the auxiliary cover and the main cover does not need to cover a portion through which the tip tool passes at attachment and detachment. In the case, the tip tool is more easily removed.

The description discloses a portable machining device. The machining device may include the above-described cover for a portable machining device.

Embodiments of the disclosure are described below with reference to the drawings as necessary. The description includes modifications of the embodiments. The disclosure is not limited to the embodiments and the modifications.

Directions of front, rear, up, down, left, and right in the embodiments and the modifications are defined for convenience of explanation, and may be changed due to, for example, at least any of a state of work and a move of a member.

A first embodiment is described.

is a left side view of a wheel sanderas an example of a machining device and a portable machining device according to the first embodiment of the disclosure.is a perspective view of a front portion of the wheel sanderwhen viewed from a rear side.is a perspective view when a sanding wheeland a coverare removed from.is an exploded perspective view of the coverwhen viewed from the rear side.

The wheel sanderaccording to the first embodiment includes a main body portion, a handle portion, and the cover. The covermay be a component of the main body portion, or may be a component of the handle portion.

In, the left side is the front side of the wheel sander. In, the upper side is the upper side of the wheel sander.

The main body portionhas a columnar shape with a center axis in a front-rear direction.

The main body portionincludes a housing, a motor, a fan, a battery mounting portion, a battery, a controller, a connector, a speed adjustment dial, a main switch, a power transmission unit, a shaft lock unit (not illustrated), a spindle() as an output shaft, a tip tool attachment portion, and the sanding wheelas a tip tool.

In the main body portion, the battery, the battery mounting portion, the controller, the connector, the motor, the fan, the power transmission unit, and the spindleare arranged in this order from the rear side.

At least one of the batteryand the sanding wheelmay be a component independent of the main body portionor the wheel sanderinstead of being a component of the main body portionor the wheel sander. In addition, the spindlemay be a component of the power transmission unit, and the tip tool attachment portionmay be used as the output shaft. Further, the spindleand the tip tool attachment portionmay be configured as the output unit together.

The housingconstitutes an outer wall of the main body portion.

The housingholds various members directly or indirectly.

The housingincludes a motor housing, a fan case, a gear housing, and a bearing box.

The motor housingis made of plastic. The motor housingis halved and includes a left motor housing and a right motor housing. The left motor housing and the right motor housing are joined by screws (not illustrated) in the right-left direction.

The motor housinghas a tubular shape. The motor housinghas a front end portion that forms a front opening portion opening forward. The motor housinghas a rear end portion that forms a rear opening portion opening rearward.

The motor housinghas a center portion in the front-rear direction that forms a grip portion G that a user can grip.

The fan caseis made of aluminum die cast alloy. The fan casehas a ring shape. The fan caseopens to the front and rear.

The gear housingis made of aluminum die cast alloy. The gear housingis a bell-shaped member having a front portion reduced in diameter with respect to a rear portion. The gear housinghas a rear end portion opening rearward. The gear housinghas a left front portion opening leftward.

The gear housingis fixed to the motor housingvia the fan case. The rear opening portion of the fan caseis joined to the front opening portion of the motor housing. The rear opening portion of the gear housingis joined to the front opening portion of the fan case. The gear housingis fixed to the fan casewith a plurality of (four) screwsthat extend forward and rearward. The screwsare arranged at the upper right, lower right, upper left, and lower left at the fan caseand the rear portion of the gear housing. Each of the screwsis inserted rearward from the front side.

The bearing box() is made of aluminum die cast alloy. The bearing boxhas a cylindrical shape with a flange portion. The bearing boxhas a center axis direction extending rightward and leftward.

The bearing boxis integrally fixed to the gear housingby a plurality of (four) screws() in the right-left direction. The screwsare arranged at upper front, lower front, upper rear, and lower rear positions of the flange portion of the bearing box.

The bearing boxhas a right opening portion connected to the left front opening portion of the gear housing.

The housingis variously changeable. For example, in the motor housing, a front portion and a rear portion may be separate bodies that can be combined with one another. In the halved motor housing, at least one of the size and the shape may significantly differ between the left motor housing and the right motor housing.

Furthermore, the left motor housing and the right motor housing may be combined by means other than screwsusing, for example, a locking portion, such as a pawl, and a locked portion, such as a pawl hole. The gear housingmay be halved. The fan casemay be omitted by being integrated with the motor housingor the gear housing. Materials of various parts in the housingmay be changed. At least one of the number and the arrangement of exhaust portsmay be changed as necessary.

The motoris an electric motor, which is a brushless motor and a DC motor.

The motorincludes a motor shaft.

The motor shaftrotates around its own center axis. The motor shaftextends forward and rearward.

At a front end portion of the motor shaft, a pinion portionis formed.

The fanis fixed integrally with the motor shaft.

The fanis a centrifugal fan. Alternatively, another fan, such as an axial fan, may be used as the fan.

At an outside of the fanin a radial direction, the exhaust portsof the fan caseare provided.

The battery mounting portionis arranged at the rear end portion of the main body portion. The battery mounting portionexpands upward, downward, leftward, and rightward with respect to a part at the front side.

The batteryis mounted to the battery mounting portion. The battery mounting portionincludes a main body portion side terminal that is connected to a terminal of the battery. The main body portion side terminal is arranged in a rear opening portion of the main body portion.