JP2638704B2 - Cutting pen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting pen in which a blade is rotatably supported at the lower end of a handle, and to a structure for supporting the rotation of the blade.

[0002]

2. Description of the Related Art As a conventional cutting pen, for example, there is one shown in FIG. First, the cutting pen will be outlined.

[0003] A holder 3 is screwed to the grip 2 at the lower end side of the handle 1, and a stopper 1 is attached to the grip 2 in the holder 3.
8 are integrally protruded. In this stopper 18, four elastic locking arms 20 extend along the center C of the holder 3, and locking holes 22 are formed between the locking arms 20. The locking recesses 25 are formed in the locking arms 20 by the locking holes 22.
Are formed. A holder 3 is provided on the outer periphery of each locking arm 20.
A space 21 is formed between the two and allows the locking arms 20 to expand against each other against their elasticity. The blade 24 is inserted into the locking hole 22 between the locking arms 20 from the lower end of the holder 3, and the upper end of the blade 24 is rotatably supported by the bearing 2 a at the lower end of the grip 2. A locking projection 23 is formed on the outer periphery of the blade 24 in the locking hole 22, and the locking projection 23 is
The blade 24 is prevented from falling out of the holder 3 by being engaged with the locking recess 25 of the "0".

[0004]

However, with such a support structure, the stopper 18 does not rotate with respect to the grip 2 and the holder 3, so that the blade 24 and the locking arms 20 of the stopper 18 which rotate with respect to them. And frictional resistance is generated between them, and the rotation of the blade 24 may not be performed smoothly. In particular, their locking uneven portions 25, 23
In this case, it is considered that the frictional resistance is increased, and the disadvantage is remarkable.

Since the blade 24 is only supported at its upper end by the bearing 2a of the grip 2, when a force is applied to the blade 24 in a direction perpendicular to the rotation center C of the blade 24, the holder 3 In the vicinity of the lower end, each locking arm 20 oscillates in the range of the space 21, and the blade 24 may be in an unstable state, which may hinder the cutting operation.

Further, a locking projection 2 is provided on the outer periphery of the blade 24.
When the blade 24 is attached to and detached from the holder 3, when the blade 24 is attached to and detached from the holder 3, the engaging protrusion 23 hinders the direct insertion and removal of the blade 24 into the engaging hole 22 between the engaging arms 20. However, the holder 3 had to be removed from the grip 2 and the blade 24 had to be inserted into and removed from the locking hole 22, which was very troublesome.

An object of the present invention is to improve the above-mentioned stopper so that the blade can be rotated more smoothly. A second object of the present invention is to improve the unevenness between the locking arm and the blade so that the blade can be easily attached to and detached from the handle.

A third object of the present invention is to improve the stability of the blade by improving the structure for rotatably supporting the blade.

[0009]

As shown in the drawings of the embodiments described later, the cutting pen according to the present invention has the following configuration.

A stopper 18 is rotatably supported inside the lower end of the handle 1, and a locking hole 22 is provided in the stopper 18. A blade 24 is inserted into support holes 9 and 17 provided inside the lower end of the handle 1, and the blade 24 is rotatably supported by the handle 1 and the stopper 18 around the rotation center C of the stopper 18. . The blade 24 is engaged with the locking hole 22 of the stopper 18, and the locking uneven portion 2 provided on the blade 24 and the stopper 18.
The blades 24 can be disengaged from the stopper 18 at 5, 23.

The stopper 18 has, for example, the following configuration. The stopper 18 has a plurality of elastic locking arms 20.
And the locking hole 22 is formed between them. Each of the locking arms 20 can be expanded with respect to each other against the elasticity. A locking projection 23 is provided on each locking arm 20 with the locking hole 22. On the other hand, a locking concave portion 25 is provided on the outer periphery of the blade 24, and the locking convex portion 2 of each of the locking arms 20 is provided.
3 can be disengaged from the locking recess 25.

The structure for supporting the rotation of the blade 24 is constituted, for example, as follows. The blade 24 is engaged with the locking hole 22 of the stopper 18 at the upper end, and the blade 24 is rotatably supported by the pair of bearings 13 and 15 between the cutting edge 26 at the lower end of the blade 24 and the stopper 18. ing.

[0013]

In the cutting operation, the cutting edge 2 of the blade 24 is used.
6 is applied to the object to be cut, and the handle 1 is moved in a desired cutting direction while pressing the handle 1 against the object to be cut. At this time, the blade 24 rotates around the bearings 13 and 15. The upper end of the blade 24 also rotates with respect to the stopper 18,
Due to the frictional resistance between them, the stopper 18
May rotate with 4.

When the blade 24 is pulled out from the handle 1 for replacement, the blade 24 expands both the locking arms 20 of the stopper 18 against its elasticity, and the locking projections 23 of the both locking arms 20 are opened. The blade 24 is separated from the locking recess 25.
Therefore, the blade 24 can be separated from the handle 1. The blade 24 can be attached to the handle 1 again by performing an operation reverse to the procedure for removing the blade 24.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cutting pen according to an embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, a plastic handle 1
Is composed of a grip 2, a holder 3, a cap 4 and a ring 5. A male screw cylinder 6 is provided at the lower end side of the grip 2, and a support hole 7 is formed therein. As shown in FIG. 2, the holder 3 is screwed around the outer periphery of the male screw cylinder 6, and in this state, a support hole in the male screw cylinder 6 is provided in a conical portion 8 of the holder 3 protruding from the lower end of the male screw cylinder 6. A support hole 9 communicating with 7 is formed. A male screw cylinder 10 is provided on the upper end side of the grip 2, and as shown in FIG.
Are formed. The ring 5 is fitted around the outer circumference of the male screw cylinder 10, and in this state, the cap 4 is screwed onto the outer circumference of the male screw cylinder 10.

A shaft cylinder 12 is fitted into the support hole 7 of the lower male screw cylinder 6 so as to abut on the conical portion 8 of the holder 3 so as not to fall out of the male screw cylinder 6. A bearing 13 is fitted to the lower end of the shaft cylinder 12. A bearing hole 14 is formed on the upper end side of the barrel 12, and bearings 15 and 16 are fitted on the inner bottom side and the opening side, respectively. These bearings 13, 15, 1 are provided in the barrel 12.
The support hole 17 is formed so as to communicate with the bearing hole 14 on the center C connecting the 6. The support hole 17 also communicates with the support hole 9 in the conical portion 8 of the holder 3, and these support holes 17, 9 are located on the same center C.

A stopper 18 made of plastic is supported in the bearing hole 14 of the barrel 12. The stopper 18 includes a rotation support portion 19 and a pair of elastic locking arms 20 extending downward from the rotation support portion 19. The rotation support portion 19 is rotatably supported by a bearing 16 on the opening side of the bearing hole 14, and a bearing 15 on the inner bottom side of the bearing hole 14.
The lower ends of both locking arms 20 are in contact with the upper part. Bearing hole 1
A space 21 is formed in the outer periphery of both locking arms 20 in 4, and the two locking arms 20 can expand toward each other toward this space 21 against its elasticity. A locking hole 22 is formed between the locking arms 20 on the rotation center C of the stopper 18, and locking projections 23 are formed inside the locking arms 20 so as to face each other.

The blade 24 has an elongated cylindrical shape, and a locking recess 25 is formed on the entire outer periphery of the upper end. The blade 24 is inserted from the support hole 9 of the conical portion 8 of the holder 3 through the support hole 17 of the barrel 12, and
The upper end of the locking arm 20 is engaged with the locking hole 22 between the locking arms 20, and the locking projection 23 of the locking arms 20 is engaged with the locking recess 2 of the blade 24.
5, and the blade 24 is rotatably supported on the rotation center C of the stopper 18 by the bearings 13 and 15. The lower end of the blade 24 protrudes from the conical portion 8 of the holder 3, and a cutting edge 26 that is inclined with respect to the rotation center C is formed at the lower end of the blade 24. The point 26a of the cutting edge 26 is eccentric by a distance L with respect to the rotation center C.

At the time of the cutting operation, the handle 1 is gripped, the tip 26a of the cutting edge 26 of the blade 24 is applied to the workpiece, and the handle 1 is moved in a desired cutting direction while pressing the handle 1 against the workpiece. Let it. At this time, since a rotational force is applied to the blade 24 in accordance with the cutting direction, the blade 24 rotates around the bearings 13 and 15. The upper end of the blade 24 also rotates with respect to the stopper 18, but the stopper 18 may rotate with the blade 24 due to frictional resistance therebetween.

When the blade 24 is withdrawn from the handle 1 to be replaced, the upper ends of the blades 24 open the two locking arms 20 of the stopper 18 against its elasticity, and
The 0 locking projection 23 is separated from the locking recess 25 of the blade 24. Therefore, the blade 24 is connected to the support hole 17 of the barrel 12.
Pull out the support hole 9 of the conical part 8 of the holder 3 and the handle 1
Can be separated from When the blade 24 is pulled out of the handle 1 in this manner, the locking arms 20 of the stopper 18 return due to their elasticity and return to the original state.
The blade 24 can be attached to the handle 1 again by performing an operation reverse to the procedure for removing the blade 24.

Particularly, in the present embodiment, not only the blade 24 rotates with respect to the handle 1 and the stopper 18 but also the stopper 18 can rotate with respect to the handle 1 and the blade 24. different. That is, the stopper 18 is necessary to prevent the blade 24 from falling out of the handle 1 carelessly. However, when the blade 24 rotates, for example, the two locking projections 23 of the stopper 18 and the locking recess 25 of the blade 24 are formed. Frictional resistance occurs during
That point is the same as that of the prior art. However, the stopper 18 rotates together with the blade 24 to absorb the frictional resistance, and the blade 24 rotates smoothly. It differs in that respect.

Further, since the blade 24 is supported by the bearings 13 and 15 between the cutting edge 26 and the stopper 18, lateral run-out in a direction orthogonal to the rotation center C is less likely to occur, and the blade 24 The stability can be improved and the cutting can be performed accurately.

Further, in the locking means between the stopper 18 and the upper end of the blade 24, a locking projection 23 is provided on both locking arms 20 of the stopper 18 and a locking recess 25 is formed on the upper end of the blade 24. Since the holder 3 is provided, the blade 24 alone can be directly attached to and detached from the handle 1 without removing the holder 3 from the male screw cylinder 6 on the lower side of the grip 2 and disassembling the shaft cylinder 12 in the male screw cylinder 6. Can be easily attached and detached.

[0025]

According to the cutting pen according to the present invention, since the blade 24 rotates and the stopper 18 also rotates, the resistance of the stopper 18 to the blade 24 is less likely to occur, and the rotation of the blade 24 is smooth. Done.

Further, a double bearing 1 for supporting the blade 24
By the action of 3, 15 the lateral deflection of the blade 24 is eliminated and the stability of the blade 24 is improved. In addition,
Locking concave and convex portions 25, 2 between the stopper 24 and the stopper 18
3, the locking recess 25 is provided on the blade 24 side. Therefore, when the blade 24 is attached to and detached from the handle 1, the locking recess 25 does not interfere with the blade 24, and the attachment and detachment can be easily performed. .

[Brief description of the drawings]

FIG. 1A is an exploded perspective view showing a cutting pen according to the present embodiment, and FIG. 1B is an exploded perspective view showing a state in which a handle of the cutting pen is assembled and only a blade is removed from the handle. .

FIG. 2 (a) is a partially enlarged sectional view showing a lower end side and a blade of the handle shown in FIG. 1 (b), and FIG. 2 (b) shows a blade attached to the lower end side of the handle shown in FIG. 1 (a). It is a partial expanded sectional view showing a state.

FIG. 3 is a partially enlarged sectional view showing only the upper end side of a handle 1 shown in FIG. 1 (b).

FIG. 4 is a partially enlarged sectional view showing a conventional cutting pen.

[Explanation of symbols]

1 handle, 2 grips, 3 holders, 6 male screw cylinders,
7 support holes, 9 support holes, 12 barrels, 13 bearings,
14 bearing holes, 15 bearings, 16 bearings, 17 support holes, 18 stoppers, 19 rotation support portions, 20 elastic locking arms, 21 spaces, 22 locking holes, 23 locking projections, 2
4 blades, 25 locking recesses, 26 cutting edges, 26a point, C center of rotation, L distance.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa Sho 62-130568 (JP, U) Japanese Utility Model Showa 56-159061 (JP, U) Japanese Utility Model Showa 56-62770 (JP, U) Japanese Utility Model Showa 55- 45954 (JP, U) Actually open 1979--23999 (JP, U) Actually open 50-87600 (JP, U) Actually open 1979-5199 (JP, U) Actually open 2-78171 (JP, U) Japanese Utility Model Showa 45-20399 (JP, Y1) Japanese Utility Model Showa 9-5412 (JP, Y1) Japanese Utility Model Showa 9-5413 (JP, Y1)

Claims (3)

(57) [Claims] A stopper (1) is provided inside the lower end of the handle (1).
8) is rotatably supported, and the stopper (1) is supported.
8) is provided with a locking hole (22), and a blade (24) is inserted into a supporting hole (9, 17) provided inside the lower end side of the handle (1), and the rotation center (C) of the stopper (18) is inserted. The blade (24) is rotatably supported around the handle (1) and the stopper (18). The blade (24) is engaged with the locking hole (22) of the stopper (18), and the blade (24) and the stopper (18) are engaged. The cutting pen is characterized in that the blade (24) can be disengaged from the stopper (18) by the locking concave and convex portions (25, 23) provided in (1) and (2). 2. A stopper (18) according to claim 1, wherein a plurality of elastic locking arms (20) are provided on the stopper (18) so as to be able to expand to each other against the elasticity thereof, and lock between said locking arms (20). Holes (2
2) The locking hole (22) is provided with a locking projection (23) on each locking arm (20), and a locking recess (25) is provided on the outer periphery of the blade (24). And a cutting pen. 3. The locking device according to claim 1, wherein the upper end of the blade is engaged with the locking hole of the stopper.
A cutting pen characterized in that a blade (24) is rotatably supported by a pair of bearings (13, 15) between a cutting edge (26) at a lower end of the blade (24) and the stopper (18).