JP2021041655A - Pencil sharpener - Google Patents

Abstract

To provide a pencil sharpener provided further rationally and finely with a structure for preventing a pencil being sharpened from corotating together with the pencil due to a torque of a rotary blade built in the pencil sharpener when sharpening the pencil.SOLUTION: The pencil sharpener includes a turning operation body 6 rotatably mounted to an outside of a casing 1 and constituted so as to include three or more introduction openings 6h for a pencil P adjacent to each other at intervals between the introduction openings 6h for the pencil P around a center xb of rotation. The respective introduction openings 6h of the turning operation body 6 are different in a hole shape profile from the other introduction openings 6h, and one end part of the pencil P is acceptable through the introduction opening 6h and an insertion hole 3 in a rotational position of the turning operation body 6 in which any one of the introduction opening 6h is communicated with the insertion hole 3.SELECTED DRAWING: Figure 2

Description

The present invention relates to an improvement in a pencil sharpener.

It is provided with a circular hole for inserting a pencil and a guide body that can be moved, and the two arm pieces of the guide body close the opposite positions of the circular hole at the advanced position of the guide body, so that the cross section becomes hexagonal. There is an electric pencil sharpener shown in Patent Document 1 in which two sides of the pencil facing each other are sandwiched between the arm pieces.
According to the pencil sharpener of Patent Document 1, when sharpening a pencil having a hexagonal cross section, the pencil inserted in the circular hole is prevented from rotating due to the torque of the rotary blade driven by the motor built in the pencil sharpener. This makes it easier to manually hold the portion of the pencil protruding from the circular hole while sharpening the pencil.

Jikkai Sho 55-130894

The main problem to be solved by the present invention is, firstly, in the pencil sharpener, when the pencil is sharpened, the pencil sharpened by the torque of the rotary blade built in the pencil sharpener does not rotate. Is more rational and has a better appearance, and is prepared for pencil sharpeners.
The main problem to be solved by the present invention is that, secondly, the pencil sharpener is provided with a configuration that prevents three or more types of pencils having different cross sections from being rotated by the torque. is there.

In order to achieve the above object, in the present invention, an electric pencil sharpener is provided with a casing provided with a pencil insertion hole.
It is configured to be rotatably attached to the outside of the casing and to be provided with three or more pencil introduction openings at intervals from adjacent pencil introduction openings in a direction orbiting the center of rotation. With the rotating operating body
A base that is rotatably supported in the casing and receives one end of the pencil that is inserted through the insertion hole, and a base that is rotatably supported by the base and rotates. It is provided with a cutting means provided with a rotary blade that rotates with it and cuts one end of the pencil received by the base.
Each of the introduction openings of the rotation operation body has a hole contour shape different from that of the other introduction openings, and any one of the introduction openings is communicated with the insertion hole. It is assumed that one end of the pencil can be received by the base through the introduction opening and the insertion hole at the rotation position of the body.

According to this configuration, for a pencil having a polygonal cross section, the rotation operating body is rotated to a position where an introduction opening having a hole contour shape following the polygonal shape communicates with the insertion hole, so that the introduction opening rotates the pencil. The torque of the blade can prevent the pencil from rotating. In addition, since three or more introduction openings have different hole contour shapes, multiple types of pencils having a polygonal cross section are placed at positions where the introduction openings having hole contour shapes that imitate them communicate with the insertion holes. By rotating the rotary operating body, the introduction opening prevents the pencil from rotating due to the torque of the rotary blade.

One of the introduction openings of the rotary operating body has a hole contour shape that follows the cross-sectional shape of a pencil having a circular cross-sectional shape.
The other one of the introduction openings of the rotary operating body has a hole contour shape that follows the cross-sectional shape of a pencil having a triangular cross section.
It is one of the aspects of the present invention that the other one of the introduction openings of the rotary operating body has a hole contour shape that follows the cross-sectional shape of a pencil having a hexagonal cross section.

Further, it is one of the aspects of the present invention that a non-slip protrusion is formed between the adjacent introduction openings in the rotary operating body.

According to the present invention, in a pencil sharpener, a structure that prevents the pencil being sharpened by the torque of the rotary blade built in the pencil sharpener from rotating when sharpening the pencil is rational and has good appearance. Can be prepared for sharpeners. Further, it is possible to prepare for a pencil sharpener so that three or more types of pencils having different cross sections are not rotated by the torque.

FIG. 1 is a perspective view of an electric pencil sharpener according to an embodiment of the present invention. FIG. 2 is a perspective view of the electric pencil sharpener, showing a cutting state of a pencil having a circular cross section. FIG. 3 is a perspective view of a rotary operating body constituting the electric pencil sharpener. FIG. 4 is a perspective view of a rotary operating body constituting the electric pencil sharpener. FIG. 5 is a perspective view showing a state in which the rotary operating body is removed from the casing side of the electric pencil sharpener. FIG. 6 is a cross-sectional view taken along the line AA in FIG. FIG. 7 is a side view of the main part of the electric pencil sharpener in the state of FIG. FIG. 8 is a broken side view of a main part of the electric pencil sharpener, showing a cutting state of a pencil having a circular cross section. FIG. 9 is a side view showing the electric pencil sharpener as viewed from the side opposite to that of FIG. 7.

Hereinafter, a typical embodiment of the present invention will be described with reference to FIGS. 1 to 9.

The pencil sharpener according to this embodiment has a built-in rotary blade 2a, and one end of a pencil P inserted through the introduction opening 6h and the insertion hole 3 described later is cut by the rotary blade 2a. is there.

In the illustrated example, the rotary blade 2a forms a part of the cutting means 2 described later, and revolves around one end portion of the pencil P inserted with the rotation of the base 2b described later, and the one end thereof. It is designed to cut the part.

In the illustrated example, the rotary blade 2a is driven by the built-in motor 12. That is, in the illustrated example, the pencil sharpener is electric. Although not shown, the rotary blade 2a revolves around one end of the pencil P as described above by manually turning the handle provided for the pencil sharpener to cut the one end. There may be. That is, the pencil sharpener in the present invention includes both electric and manual sharpeners.

When the pencil sharpener is electric, power may be supplied to the built-in motor 12 by a commercial power source through a power cord, or by a dry battery or a storage battery built in the casing 1 described later. Further, as shown in FIG. 9, power may be supplied to the built-in motor 12 through a female connector 13 such as a USB connector provided in the casing 1.

Reference numeral 1 in FIG. 1 is a casing constituting the outer shell of a pencil sharpener. The casing 1 has a substantially hexahedral shape.

In the illustrated example, the pencil sharpener has a structure in which the pencil P is inserted from above. That is, in the illustrated example, the insertion hole 3 for the pencil P is formed on the upper surface 1a side of the casing 1. In FIG. 1, reference numeral 1b indicates the bottom surface of the casing 1, and reference numerals 1c and 1d indicate the side surface of the casing 1. The upper surface 1a of the casing 1 has a rectangular shape that is long in the left-right direction in FIG. The insertion hole 3 of the pencil P is provided at a position in the middle of the casing 1 on the upper surface 1a side in the length direction. In the figure, reference numeral 4 indicates a main portion of the casing 1, reference numeral 5 indicates a shavings storage portion, and shavings generated by cutting the pencil P by the cutting means 2 described later are guided and stored in the storage portion 5. The cover 5a forming the upper surface 1a of the casing 1 constituting the storage portion 5 is removed and discarded.

A rotation operating body 6 is attached to the outside of the casing 1 so that it can be rotated. In the illustrated example, the rotation operating body 6 is provided on the upper surface 1a of the casing 1.

In the illustrated example, the rotary operating body 6 includes a disc portion 6a having an outer diameter that fits within the width dimension of the upper surface 1a of the casing 1, and an outer diameter substantially equal to the outer diameter of the disc portion 6a. It is provided with a ring portion 6b having a short cylindrical shape. The ring portion 6b and the disk portion 6a are integrated so as to close the cylinder end 6c of the ring portion 6b. An outer collar 6e is formed on the other end 6d of the cylinder of the ring portion 6b.

A receiving portion 7 of the rotation operating body 6 is formed on the upper surface 1a of the casing 1. In the illustrated example, the receiving portion 7 has an outer diameter substantially equal to the inner diameter of the ring portion 6b in a circular recess 7a having an inner diameter substantially equal to the outer diameter of the disk portion 6a of the rotary operating body 6. It is in the form of forming a circular raised portion 7c provided with the above. A circumferential groove 7e having a groove width for accommodating the ring portion 6b is formed between the concave side peripheral wall 7b forming the circular recess 7a and the raised portion side peripheral wall 7d forming the raised portion 7c. ing.

On the concave side peripheral wall 7b, a plurality of engaging pieces 7g are formed at intervals from the adjacent engaging pieces 7g in the direction around the center xa (see FIG. 5) of the raised portion 7c. In the illustrated example, 7 g of engaging pieces are provided at three locations. The engaging piece 7g is the recess divided by a pair of split grooves 7i that vertically cut out the recessed peripheral wall 7b and a communication groove 7j (see FIG. 6) extending between the lower ends of the pair of split grooves 7i. It is composed of a part of the side peripheral wall 7b. At the lower end of the engaging piece 7g, a claw portion 7h protruding toward the ridge side peripheral wall 7d is formed.

In the illustrated example, when the rotation operating body 6 is inserted into the circumferential groove 7e of the receiving portion 7 with the other end 6d of the cylinder of the ring portion 6b first, the other end of the cylinder 6d of the ring portion 6b is inserted. The outer collar 6e formed in the above hits the claw portion 7h of the engaging piece 7g, and the engaging piece 7g is elastically deformed until the other end 6d of the cylinder of the ring portion 6b abuts on the bottom 7f of the circumferential groove 7e. The ring portion 6b can be inserted into the circumferential groove 7e of the receiving portion 7. When the ring portion 6b is inserted into the circumferential groove 7e of the receiving portion 7 to the position where the other end 6d of the cylinder of the ring portion 6b abuts on the bottom 7f of the circumferential groove 7e, the engaging piece 7g elastically returns to the outer collar 6e. The claw portion 7h is caught. As a result, the rotation operating body 6 is rotatably attached to the casing 1 so that the center xa of the raised portion 7c of the receiving portion 7 is the center xb of rotation (see FIG. 1).

Further, in the illustrated example, the ring portion 6b of the rotation operating body 6 is provided with a plurality of elastic pieces 6f at intervals from the elastic pieces 6f adjacent to each other in the direction around the center xb of the rotation. .. Each elastic piece 6f is composed of a part of the ring portion 6b separated by a pair of split grooves 6g extending upward from the other end 6d of the cylinder of the ring portion 6b. In the illustrated example, the outer collar 6e of the elastic piece 6f is elastically pressed against the recessed peripheral wall 7b in a state where the casing 1 is rotatably combined with the rotary operating body 6, and the rotating operating body 6 is formed. It is designed so that it can be rotated without shaking or rattling.

The insertion hole 3 of the casing 1 is opened at the raised portion 7c of the receiving portion 7 to communicate the inside and the outside of the casing 1. In the illustrated example, the insertion hole 3 of the casing 1 is formed at a position eccentric with respect to the center xa of the raised portion 7c. More specifically, in the illustrated example, the insertion hole 3 of the casing 1 is a straight line along the length direction of the casing 1 and divides the upper surface 1a of the casing 1 into two through the center xa of the raised portion 7c. The center of the insertion hole 3 is positioned on the straight line y (see FIG. 5), and the insertion hole 3 is provided on the storage portion 5 side of the center xa of the raised portion 7c. The insertion hole 3 of the casing 1 has a circular hole contour shape.

On the other hand, the rotation operating body 6 is provided with three or more pencil P introduction openings 6h at intervals from adjacent pencil P introduction openings 6h in a direction around the center xb of rotation. Further, each of the introduction openings 6h of the rotation operating body 6 has a hole contour shape different from that of the other introduction openings 6h, and any one of the introduction openings 6h is inserted into the insertion hole 3. At the rotation position of the rotation operating body 6 communicated with the above, one end of the pencil P can be received by the base 2b through the introduction opening 6h and the insertion hole 3 (see FIGS. 1, 2, and 8). ..

In the illustrated example, the rotation operating body 6 is formed with three introduction openings 6h at 90-degree intervals in a direction around the center xb of the rotation.

In this embodiment, one of the introduction openings 6h of the rotary operating body 6 has a hole contour shape that follows the cross-sectional shape of a pencil P having a circular cross-sectional shape.
The other one of the introduction openings 6h of the rotary operating body 6 has a hole contour shape that follows the cross-sectional shape of the pencil P having a triangular cross-sectional shape.
Yet another one of the introduction opening 6h of the rotation operating body 6 has a hole contour shape that follows the cross-sectional shape of a pencil P having a hexagonal cross section.

As a result, in this embodiment, for the pencil P having a polygonal cross section, the rotation operating body 6 is placed at a position where the introduction opening 6h having a hole contour shape following the polygonal cross section communicates with the insertion hole 3. By rotating the pencil P, the introduction opening 6h prevents the pencil P from rotating due to the torque of the rotary blade 2a. Further, since the three (or more) introduction openings 6h have different hole contour shapes, a plurality of types of pencils P having a polygonal cross section are inserted into the introduction openings 6h having hole contour shapes that imitate them. By rotating the rotation operating body 6 to a position communicating with the hole 3, the introduction opening 6h can prevent the pencil P from rotating due to the torque of the rotary blade 2a.

In this embodiment, for a pencil P having a triangular cross section (a pencil P having a triangular cross section in a direction orthogonal to the length direction of the pencil P), the pencil P follows the cross-sectional shape of the pencil P. By communicating the introduction opening 6ha having a triangular hole contour shape substantially equal to the thickness of the pencil P with the insertion hole 3, the rotation of the pencil P can be suppressed. Further, for a pencil P having a hexagonal cross section (a pencil P having a hexagonal cross section in a direction orthogonal to the length direction of the pencil P), the thickness and substance of the pencil P follow the cross-sectional shape of the pencil P. By communicating the introduction opening 6hb having a hexagonal hole contour shape of the same size with the insertion hole 3, the rotation of the pencil P can be suppressed. Further, for a pencil P having a circular cross section (a pencil P having a circular cross section in a direction orthogonal to the length direction of the pencil P), the thickness and substance of the pencil P are similar to the cross section shape of the pencil P. The pencil P can be sharpened by the rotary blade 2a by communicating the introduction opening 6hc having a circular hole contour shape of the same size with the insertion hole 3.

When the hole contour shape of the introduction opening 6h is circular, the diameter of the introduction opening 6h is equal to or slightly smaller than the diameter of the insertion hole 3. Further, when the hole contour shape of the introduction opening 6h is a polygon, the diameter of the virtual circle (not shown) inscribed by the polygon is equal to or slightly equal to the diameter of the insertion hole 3. Keep it small.

The rotary blade 2a is rotatably supported in the casing 1 and rotatably supported by a base 2b that receives one end of the pencil P inserted through the insertion hole 3. ing. At the same time, the rotary blade 2a rotates with the rotation of the base 2b and cuts one end of the pencil P received by the base 2b. The cutting means 2 is composed of the base 2b and the rotary blade 2a.

The base 2b is supported on the casing 1 side so that a virtual straight line z (see FIG. 7) along the vertical direction passing through the center of the insertion hole 3 is the center of rotation. An introduction port 2d into the receiving space 2c of the pencil P is formed at the upper end of the base 2b, and this introduction port 2d is located below the insertion hole 3. The inner inner part of the receiving space 2c is a conical space whose cross-sectional area decreases toward the bottom. A part of the peripheral surface of the rotary blade 2a faces the receiving space 2c. The rotary blade 2a is rotatably supported by the base 2b so that its rotation axis is substantially along the inclination of the inclined peripheral surface of the receiving space 2c. A gear portion 2e that meshes with the internal gear 8 formed on the casing 1 side is attached to the upper end portion of the rotary blade 2a, and when the base 2b rotates, the rotary blade 2a rotates and enters the receiving space 2c. It revolves around one end of the inserted pencil P so that one end of the inserted pencil P is cut in the receiving space 2c. A rib-shaped blade 2f is formed on the peripheral surface of the rotary blade 2a along a spiral around the rotation axis. In FIG. 7, reference numeral 9 is a drive side gear provided on the drive shaft of the built-in motor 12, and reference numeral 11 is a transmission of the driving force of the drive side gear 9 to the base side gear 10 provided on the upper end of the base 2b. It shows a part of the transmission gear.

Further, in this embodiment, a non-slip protrusion 6i is formed between the adjacent introduction openings 6h in the rotation operating body 6.

In the illustrated example, the non-slip protrusion 6i is formed at a rib formed along a virtual first line segment L1 passing through the rotation center xb of the rotation operation body 6 and at the rotation center xb of the rotation operation body 6. It is composed of ribs formed along the virtual second line segment L2 orthogonal to the virtual line segment L1. The disc portion 6a of the rotary operating body 6 is divided into four regions by these non-slip protrusions 6i, and one of the four regions does not have the introduction opening 6h, and the rest of the disc portion 6a is not provided. The introduction opening 6h is formed one by one in each of the three regions. If the rotation operating body 6 is positioned at a position where the region without the introduction opening 6h is located on the insertion hole 3 of the casing 1, the insertion hole 3 is closed and the pencil P cannot be inserted into the casing 1. Can be created.

In the illustrated example, the disk portion 6a of the rotation operating body 6 has a dome shape with the center xb of its rotation as the apex, and the apex is substantially flush with the upper surface 1a of the casing 1. The distance between the upper surface of the disc portion 6a and the upper surface 1a of the casing 1 gradually increases as the top portion approaches the outer edge of the disc portion 6a. Correspondingly, the raised portion 7c of the receiving portion 7 also has a dome shape (see FIG. 7). The non-slip protrusion 6i is formed so as to start from a position spaced apart from the center xb of rotation of the rotation operating body 6 and reach the outer edge of the disk portion 6a of the rotation operating body 6. Further, the protrusion dimension and the width dimension of the non-slip protrusion 6i from the upper surface 1a of the disk portion 6a are gradually increased as they approach the outer edge of the disk portion 6a.

The non-slip protrusion 6i of the rotation operating body makes it possible to easily perform the rotation operation by pressing a finger against the rotation operating body 6.

As a matter of course, the present invention is not limited to the embodiments described above, but includes all embodiments that can achieve the object of the present invention.

P Pencil xb Center of rotation 1 Casing 3 Insertion hole 6 Rotating manipulator 6h Introduction opening

Claims (3)

A casing with a pencil insertion hole and
It is configured to be rotatably attached to the outside of the casing and to be provided with three or more pencil introduction openings at intervals from adjacent pencil introduction openings in a direction orbiting the center of rotation. With the rotating operating body
A base that is rotatably supported in the casing and receives one end of the pencil that is inserted through the insertion hole, and a base that is rotatably supported by the base and rotates. It is provided with a cutting means provided with a rotary blade that rotates with it and cuts one end of the pencil received by the base.
Each of the introduction openings of the rotation operation body has a hole contour shape different from that of the other introduction openings, and one of the introduction openings is communicated with the insertion hole. A pencil sharpener that allows one end of the pencil to be received by the base through the introduction opening and the insertion hole at the rotational position of the body. One of the introduction openings of the rotary operating body has a hole contour shape that follows the cross-sectional shape of a pencil having a circular cross-sectional shape.
The other one of the introduction openings of the rotary operating body has a hole contour shape that follows the cross-sectional shape of a pencil having a triangular cross section.
The pencil sharpener according to claim 1, wherein the other one of the introduction openings of the rotary operating body has a hole contour shape that follows the cross-sectional shape of a pencil having a hexagonal cross section. The pencil sharpener according to claim 1 or 2, wherein a non-slip protrusion is formed between adjacent introduction openings in the rotary operating body.

Images