JP2009184039A - Sander - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sander capable of grinding a narrow space and a corner and having inexpensive abrasive paper by eliminating waste in cutting out the abrasive paper. <P>SOLUTION: In the sander comprising a motor, a housing for accommodating the motor, and a base to which the power of the motor is transmitted, a shape of the base and the abrasive paper 7 detachable to the base is pentagonal having a combination of a rectangle and an isosceles triangle. In the abrasive paper with a shape of rectangular, three perforated lines 7a, 7b and 7c are provided to allow a rectangle, an isosceles triangle and a right-angled triangle to be separated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sander such as an orbital sander that polishes the surface of a material to be polished by polishing paper attached to a bottom surface of the base by connecting the base in a straight line through a rotating mechanism of a motor built in the main body via an eccentric mechanism. It is about.

  In the conventional sander, the shape of the base and the polishing paper is often a triangle or a shape similar to a pentagon so that a narrow space or corner can be polished.

  However, as shown in FIGS. 4 and 5, in the conventional abrasive paper, the corners are R-shaped, and the lines connecting the vertices are large R-shaped.

  In addition to the shape of the above-mentioned abrasive paper, there are also rectangular shapes, but depending on the depth of the corner, the polishing operation is difficult and is generally not used for polishing work in narrow spaces and corners. .

JP-A-7-136919

  As shown in FIGS. 4 and 5, the polishing paper 7 used for the work using the conventional sander has an R shape at the corners or a large R shape at the line connecting the vertices. Since the yield at the time of picking up the material of the paper 7 is poor and the discarding part 7d of the abrasive paper 7 comes out, it is wasted. The price of the polishing paper 7 is expensive because it includes the discarding section 7d.

  In addition, when the shape of the abrasive paper 7 is rectangular, the polishing operation is difficult depending on the depth of the corner, and generally cannot be used for polishing work in a narrow space or corner.

  The object of the present invention is to solve the above-mentioned problems of the prior art, perform a polishing operation in a narrow space and corners, and eliminate the waste when taking the material of the abrasive paper 7, thereby reducing the sander having the inexpensive abrasive paper 7. Is to provide.

  In order to solve the above problems, the present invention provides a sander having a motor, a housing for housing the motor, and a base to which the power of the motor is transmitted. It is characterized by a pentagon combining isosceles triangles.

  Further, the shape of the abrasive paper is rectangular, and three perforations are provided so that the rectangle can be separated from the isosceles triangle and the right triangle.

  According to the first aspect of the present invention, since the base and the abrasive paper are pentagons that are a combination of a rectangle and an isosceles triangle, a narrow space and corners can be polished, and the yield when the abrasive paper is taken is increased. The abrasive paper waste section can be minimized, and by minimizing the waste section, the price of the abrasive paper can be reduced.

  According to the second aspect of the present invention, the replacement work of the abrasive paper can be easily performed, and the work efficiency can be improved.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of a main part of a sander showing an embodiment of the present invention, and FIG. 2 is a plan view of a polishing paper showing an embodiment of the present invention.

  In FIG. 1, a motor 2 is built in a housing 1, and a balance fan 3 is fixed to a motor shaft 2 a of the motor 2. A ball bearing 4 is pivotally supported on the balance fan 3 at a position eccentric from the motor shaft 2 a, and a base 5 is pivotally supported on the outer periphery of the ball bearing 4. In addition, a plurality of legs 8 are fixed vertically to the upper end of the base 5, and the base 5 is supported below the housing 1 by fixing the upper ends of the legs 8 to the housing 1.

  A pad 6 having the same shape as the base 5 is affixed to the bottom surface of the base 5, and a polishing paper 7 is affixed to the bottom surface of the pad 6. The polishing paper 7 is detachable from the base.

  Due to the rotation of the motor shaft 2a, the balance fan 3 rotates, the ball bearing 4 at the eccentric position rotates eccentrically, the base 5 moves in a circular orbit (orbital movement), and the polishing paper 7 provided on the bottom surface of the base 5 The material to be polished is polished.

  Next, details of the present invention will be described with reference to FIG. Since the shapes of the polishing paper 7 and the base 5 are basically the same, the description of the shape of the base 5 is omitted, and only the shape of the polishing paper 7 will be described.

  The shape of the abrasive paper 7 is rectangular, and perforations 7a and 7b are provided so that L1 and L2 have the same length.

  Normally, when performing the polishing operation, the polishing paper 7 is cut along the perforations 7a and 7b to form a five-stroke shape that is a combination of a rectangle and an isosceles triangle.

  Usually, when a narrow space or a corner is polished, the triangular tip of the polishing paper 7 tends to be worn first. For this reason, it is usually necessary to replace the isosceles triangular portion of the abrasive paper 7. The rectangular portion is less likely to be worn than the isosceles triangular portion, and therefore the frequency of replacement is low.

  Furthermore, in the present invention, a perforation 7c is provided at a place where the rectangle and the isosceles triangle of the polishing paper 7 are combined, the triangular portion is peeled off, and a portion cut by the perforations 7a and 7b of the polishing paper 7 is pasted. No more abrasive paper 7 is left.

  Further, by making the polishing paper 7 rectangular, the polishing paper 7 can be removed from the raw material of the large polishing paper 7 without waste, the yield is good, and the price can be reduced.

  Further, by providing the perforations 7a, 7b, 7c, the replacement work of the abrasive paper can be easily performed, and the working efficiency can be improved.

  Even if the shape of the material of the polishing paper 7 is a five-stroke shape that is a combination of a rectangle and an isosceles triangle from the beginning, it is obvious that the portion to be discarded decreases.

It is principal part sectional drawing of the sander which shows embodiment of this invention. 1 is a view in the direction of arrow A in FIG. 1 showing an embodiment of the present invention. The top view of the abrasive paper which shows embodiment of this invention. The top view of the abrasive paper which shows conventional embodiment. The top view of the abrasive paper which shows conventional embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Housing, 2 ... Motor, 2a ... Motor shaft, 3 ... Balance fan, 4 ... Ball bearing, 5 ... Base, 6 ... Pad, 7 ... Polishing paper, 7a, 7b, 7c ... Perforation, 7d ... Discarding part, 8 ... Leg

Claims (2)

A motor,
A housing for housing the motor;
A base to which the power of the motor is transmitted;
In sanda with
A sander characterized in that the shape of the base and the abrasive paper detachably attached to the base is a pentagon that combines a rectangle and an isosceles triangle.   2. The sander according to claim 1, wherein the shape of the abrasive paper is a rectangle, and three perforations are provided so that the rectangle can be separated from an isosceles triangle and a right triangle.

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