JP3190584U - Handheld belt sander - Google Patents

Abstract

Provided is a hand-held belt sander that can effectively prevent the movement of a bearing of a driven pulley and a support mechanism of the driven pulley from being deteriorated.
A gripper body housing, an electric motor accommodated therein, a drive pulley driven to rotate by the electric motor, a driven pulley 16 having a rotation center axis parallel to the driven pulley, and between the drive pulley and the driven pulley 16 A processing portion 10 having a sander belt suspended on the arm, the processing portion 10 being an arm portion fixed to the main body housing, a holder 15 slidable with respect to the arm portion, and a spring for urging this in the protruding direction The driven pulley 16 is attached to the holder 15 via bearings 41 and 42, and a sealing material 45 for preventing abrasive powder intrusion is disposed on the outer end surfaces of the bearings 41 and 42.
[Selection] Figure 2

Description

  The present invention relates to a hand-held belt sander used for processing and finishing woodwork products and metal products.

   In general, a hand-held belt sander used for finishing a woodworking product or a metal product has a driving pulley that is driven by a driving force from the output shaft of the motor at the front of a grippable body housing with a built-in electric motor. And a driven pulley disposed further forward of the drive pulley, and an endless sander belt suspended on the drive pulley and the driven pulley (see, for example, Patent Document 1 below).

 In the hand-held belt sander, the driving force from the output shaft of the motor is transmitted to the driving pulley via a bevel gear that meshes with a pinion gear provided at the front end portion of the output shaft. The shaft of the bevel gear is disposed in a direction perpendicular to the axial direction of the output shaft of the motor and along the width direction of the main body housing, and the drive pulley is attached to the tip of the shaft. Then, the worker grips the main body housing with a built-in motor, and processes the workpiece so that the sander belt is applied to the workpiece.

Japanese Utility Model Publication No. 58-51953

  By the way, in the driven pulley close to the workpiece, the polishing powder penetrates into the bearing of the driven pulley and the support mechanism of the driven pulley when the workpiece is polished and ground by the sander belt, and the bearing and the driven pulley are supported. There was a problem that the movement of the mechanism worsened

  In view of the above, the present invention is intended to provide a hand-held belt sander that can effectively prevent the movement of the bearing of the driven pulley and the support mechanism of the driven pulley.

The first aspect of the present invention is a handheld belt sander. The hand-held belt sander includes a grippable main body housing, an electric motor housed in the main body housing, a drive pulley that is driven to rotate by the electric motor, a driven pulley whose rotation axis is parallel to the drive pulley, and the A machining section having an endless sander belt suspended between a drive pulley and a driven pulley;
The working portion includes an arm portion fixed to the main body housing, a holder having a shaft portion slidably fitted into a bottomed insertion hole provided in the arm portion, and biases the shaft portion in a protruding direction. The driven pulley is attached to the holder via a bearing, and a sealing material for preventing invasion of abrasive powder is disposed on the outer end surface of the bearing.

  In the first aspect, an O-ring arrangement groove is formed around a portion of the shaft portion that is always fitted in the bottomed insertion hole, and an O-ring is provided in the O-ring arrangement groove. It is good to have.

  In the first aspect, an opening window communicating with the outside may be provided near the bottom of the bottomed insertion hole.

  In the first aspect, the holder has a U-shaped bracket portion, a support shaft is provided on the U-shaped bracket portion, and the bearing is provided on an outer periphery of the support shaft. The sealing material is good to be the structure arrange | positioned inside a U-shaped bracket part.

The second aspect of the present invention is also a handheld belt sander. The hand-held belt sander includes a grippable main body housing, an electric motor housed in the main body housing, a drive pulley that is driven to rotate by the electric motor, a driven pulley whose rotation axis is parallel to the drive pulley, and the A machining section having an endless sander belt suspended between a drive pulley and a driven pulley;
The working portion includes an arm portion fixed to the main body housing, a holder having a shaft portion slidably fitted into a bottomed insertion hole provided in the arm portion, and biases the shaft portion in a protruding direction. The driven pulley is rotatably attached to the holder, and an O-ring arrangement groove is formed so as to go around a portion of the shaft portion that is always fitted in the bottomed insertion hole. The O-ring disposition groove is provided with an O-ring.

The third aspect of the present invention is also a handheld belt sander. The hand-held belt sander includes a grippable main body housing, an electric motor housed in the main body housing, a drive pulley that is driven to rotate by the electric motor, a driven pulley whose rotation axis is parallel to the drive pulley, and the A machining section having an endless sander belt suspended between a drive pulley and a driven pulley;
The working portion includes an arm portion fixed to the main body housing, a holder having a shaft portion slidably fitted into a bottomed insertion hole provided in the arm portion, and biases the shaft portion in a protruding direction. The driven pulley is rotatably attached to the holder, and an opening window communicating with the outside is provided at a position near the bottom of the bottomed insertion hole.

  Any combination of the above components is also effective as an aspect of the present invention.

  According to the handheld belt sander according to the present invention, it is possible to effectively prevent the movement of the bearing of the driven pulley and the support mechanism of the driven pulley.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a processing unit having an endless sander belt suspended between a driving pulley driven by an electric motor and a driven pulley, according to a first embodiment of a hand-held belt sander according to the present invention. Sectional drawing of the principal part structure containing the driven pulley of 1st Embodiment. The disassembled perspective view of the principal part structure containing a driven pulley in 1st Embodiment. The longitudinal cross-sectional view which shows the holder part (support mechanism of a driven pulley) which a sliding shaft part fits slidably in the arm part and this bottomed insertion hole in 1st Embodiment. The longitudinal cross-sectional view which shows the holder (supporting mechanism of a driven pulley) which has a sliding shaft part slidably inserted in this bottomed insertion hole and the arm part in 2nd Embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. Further, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  A first embodiment of the present invention will be described with reference to FIGS. In these drawings, a hand-held belt sander 1 includes a main body housing 2 that can be gripped by an operator, an electric motor 3 housed in the main body housing 2, and a processing unit 10 that is driven by this to run the endless sander belt 11. With.

  The processing portion 10 includes a connecting portion 12 that is connected and fixed to the front end portion of the main body housing 2, a drive pulley 13 that is rotatably supported by the connecting portion 12, an arm portion 14 that is integral with the connecting portion 12, and an arm portion. 14 includes a holder 15 slidably supported at 14, a driven pulley 16 attached to the holder 15, and an endless sander belt 11 suspended between the driving pulley 13 and the driven pulley 16. The rotation center axes of the driving pulley 13 and the driven pulley 16 are parallel to each other. A cover 17 that partially surrounds the drive pulley 13 is fixed on the connecting portion 12.

  A bevel gear 21 is fixed to the output shaft 3 a of the electric motor 3, and a bevel gear 22 meshing with the bevel gear 21 is fixed to a drive shaft 23 that is pivotally supported by the connecting portion 12 so as to be orthogonal to the output shaft 3 a. The drive pulley 13 is fixed to the front. Accordingly, the rotational force of the electric motor 3 is transmitted to the drive pulley 13 via the bevel gears 21 and 22 in the connecting portion 12.

  FIG. 4 shows a support mechanism for the driven pulley 16. As shown in FIG. 4, the arm portion 14 is provided with a bottomed insertion hole 14 a so that the sliding shaft portion 15 a of the holder 15 is slidably fitted. Yes. A spring 25 that urges the shaft portion 15a in the protruding direction (and hence the driven pulley 16 in the forward direction) is disposed in the bottomed insertion hole 14a. As a result, the endless sander belt 11 is suspended between the driving pulley 13 and the driven pulley 16 so as not to loosen. The periphery of the bottomed insertion hole 14a of the arm portion 14 is a receiving member 14b having good slidability, and always faces the receiving member 14b (in other words, is always fitted in the bottomed insertion hole 14a). An O-ring arrangement groove 15b is formed so as to go around the portion 15a, and an O-ring 30 for preventing abrasive powder intrusion is provided in the O-ring arrangement groove 15b. In order to maintain the rotation center axes of the driving pulley 13 and the driven pulley 16 in parallel with each other, the shaft portion 15a slides with respect to the arm portion 14 but does not rotate.

  As shown in FIGS. 2 and 3, the driven pulley 16 has a pair of bearings such as ball bearings 41 and 42 around a fixed shaft body 32 fixed to the U-shaped bracket portion 15 c of the holder 15 with a screw 31. It is attached. That is, the inner rings 41a and 42a of the pair of bearings 41 and 42 are fitted around the fixed shaft body 32, and the washer 43 fitted around the fixed shaft body 32 is interposed between the inner rings 41a and 42a. The driven pulley 16 is fitted to the outside of the rings 41b and 42b, and a circular sheet-like sealing material 45 for preventing invasion of abrasive powder is disposed on the outer end surfaces of the pair of bearings 41 and 42. The pair of bearings 41, 42 and the sealing material 45 located on the outer end face are disposed inside the U-shaped bracket portion 15c. The material of the sealing material 45 is, for example, an abrasion resistant resin.

  In the above configuration, when the electric motor 3 is rotationally driven, the rotational force is transmitted to the driving pulley 13 via the bevel gears 21 and 22 and is suspended between the driving pulley 13 and the driven pulley 16 by the driving force of the driving pulley 13. The endless sander belt 11 rotates, and the processed part is processed by applying the sander belt 11 to the processed part.

  By the way, the abrasive powder is scattered from the sander belt 11 and the processed part during processing, but when this enters the bearings 41 and 42 that rotatably support the driven pulley 16, the movement of the bearings 41 and 42 becomes worse. 41 and 42 need to be replaced.

  In the present embodiment, such a disadvantage can be avoided by disposing the circular sheet-shaped sealing material 45 for preventing polishing powder intrusion on the outer end surfaces of the pair of bearings 41 and 42.

  Further, when the abrasive powder scattered from the sander belt 11 or the processed portion enters the fitting portion of the shaft portion 15a of the holder 15, the sliding operation of the shaft portion 15a may be hindered.

  In the present embodiment, the O-ring disposition groove 15b circulates around the portion of the shaft portion 15a that always faces the receiving member 14b of the arm portion 14 (in other words, is always fitted in the bottomed insertion hole 14a). And an O-ring 30 for preventing polishing powder intrusion is provided in the O-ring arrangement groove 15b to prevent the polishing powder from entering and accumulating inside the arm portion 14 and sliding the shaft portion 15a. Smooth movement can be achieved.

  FIG. 5 shows a holder 15 (supporting mechanism for a driven pulley) having an arm portion 14 and a sliding shaft portion 15a slidably fitted into the bottomed insertion hole 14a in the second embodiment of the present invention. In this case, there is no O-ring arrangement groove and O-ring in the shaft portion 15a, and an opening window 14c communicating with the outside is provided at a position near the bottom of the bottomed insertion hole 14a. Other configurations are the same as those in the first embodiment.

  According to the second embodiment, when the abrasive powder attached to the arm portion 14 and the holder 15 is removed by blowing compressed air, the abrasive powder is placed in the gap between the bottomed insertion hole 14a and the shaft portion 15a. Even if it invades, by blowing compressed air toward the gap between the bottomed insertion hole 14a and the shaft portion 15a, the air passing through the gap between the bottomed insertion hole 14a and the shaft portion 15a It is possible to enter the back and exit from the opening window 14c, and it is possible to effectively remove the polishing powder. Moreover, it is possible to prevent polishing powder from accumulating at the bottom of the bottomed insertion hole 14a.

  The present invention has been described above by taking the embodiment as an example. However, it will be understood by those skilled in the art that each component of the embodiment can be variously modified within the scope of the claims.

DESCRIPTION OF SYMBOLS 1 Belt sander 2 Main body housing 3 Electric motor 10 Processing part 11 Endless sander belt 12 Connection part 13 Drive pulley 14 Arm part 14a Bottomed insertion hole 14b Receiving member 14c Opening window 15 Holder 15a Sliding shaft part 15b O-ring arrangement groove 15c U-shaped bracket 16 Driven pulley 25 Spring 30 O-ring 41, 42 Bearing 45 Sealing material

Claims (6)

A gripper body housing;
An electric motor housed in the body housing;
A drive pulley that is rotationally driven by the electric motor, a driven pulley whose rotation center axis is parallel to the drive pulley, and a processing unit having an endless sander belt suspended between the drive pulley and the driven pulley,
The working portion includes an arm portion fixed to the main body housing, a holder having a shaft portion slidably fitted into a bottomed insertion hole provided in the arm portion, and biases the shaft portion in a protruding direction. A spring,
The follower pulley is attached to the holder via a bearing, and a sealing material for preventing polishing powder intrusion is disposed on the outer end surface of the bearing.   An O-ring arrangement groove is formed so as to go around a portion of the shaft portion that is always fitted in the bottomed insertion hole, and the O-ring arrangement groove is provided with an O-ring. The hand-held belt sander according to claim 1.   The hand-held belt sander according to claim 1, wherein an opening window communicating with the outside is provided near the bottom of the bottomed insertion hole.   The holder has a U-shaped bracket portion, a support shaft is provided on the U-shaped bracket portion, the bearing is provided on an outer periphery of the support shaft, and the bearing and the sealing material are U-shaped brackets. The hand-held belt sander according to any one of claims 1 to 3, wherein the hand-held belt sander is disposed inside the portion. A gripper body housing;
An electric motor housed in the body housing;
A drive pulley that is rotationally driven by the electric motor, a driven pulley whose rotation center axis is parallel to the drive pulley, and a processing unit having an endless sander belt suspended between the drive pulley and the driven pulley,
The working portion includes an arm portion fixed to the main body housing, a holder having a shaft portion slidably fitted into a bottomed insertion hole provided in the arm portion, and biases the shaft portion in a protruding direction. A spring,
The driven pulley is rotatably attached to the holder,
An O-ring arrangement groove is formed so as to go around a portion of the shaft portion that is always fitted in the bottomed insertion hole, and the O-ring arrangement groove is provided with an O-ring. Hand-held belt sander. A gripper body housing;
An electric motor housed in the body housing;
A drive pulley that is rotationally driven by the electric motor, a driven pulley whose rotation center axis is parallel to the drive pulley, and a processing unit having an endless sander belt suspended between the drive pulley and the driven pulley,
The working portion includes an arm portion fixed to the main body housing, a holder having a shaft portion slidably fitted into a bottomed insertion hole provided in the arm portion, and biases the shaft portion in a protruding direction. A spring,
The driven pulley is rotatably attached to the holder,
An opening window communicating with the outside is provided at a position near the bottom of the bottomed insertion hole.

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