JPH0911187A - Ring cutting-off tool - Google Patents

Abstract

PURPOSE: To provide a ring cutting-off tool which can accurately form a ring of narrow width from a sheet made of rubber. CONSTITUTION: This is a ring cutting-off tool cutting out a sheet into a ring shape, an axial leg 2 and a rotational leg 3 are connected together capably of being opened/closed at an optional angle, the rotational leg 3 is bendable at a middle point, and a detachable attachment 14 is mounted on a lower part of the leg 3. This ring cutting-off tool is constituted of an inserting part 12 in which anattachment 4 is inserted into a fitting hole 11 provided on the lower part of the rotational leg 3, and a cutting-off part 13 in which a pair of cutting blades 15, 15 are oppositely hung in the parallel condition spacedly by a fixed distance 17 on the lower part of the inserting part 12. The each cutting blade 15 is formed into nearly a V-shape of acute angle at the tip part, and both sides of the V-shaped part are formed into cutting edges 18, 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mainly made of rubber and has a thin and flexible sheet (hereinafter, abbreviated as "sheet").
The present invention relates to a ring cutting tool for forming a narrow ring.

[0002]

2. Description of the Related Art When forming a ring from a sheet,
It is common to punch a sheet with a punch, but if you work in the same way when forming a ring with a narrow width, the sheet will be crushed by the pressing force of the punch. It was sometimes punched by the shape.
Therefore, conventionally, only the inner diameter of the ring was punched out,
After that, the outer diameter of the ring was cut out with scissors to form the ring.

[0003]

However, since the outer diameter of the ring is cut out with scissors, the cut surface is distorted, and it was not possible to form a highly accurate ring.

Therefore, the present invention provides a ring cutting tool capable of forming a narrow ring from a sheet in a highly accurate state, and solves the above-mentioned inconvenience.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a shaft leg and a rotary leg are connected so as to be openable and closable at a free angle, the rotary leg is capable of being bent in the middle, and an attachment which is attachable / detachable is attached to a lower portion thereof. The insertion part, whose attachment is to be inserted into the fitting hole provided in the lower part of the rotary leg, and a pair of cutting blades in the lower part of the insertion part, with the opposing surfaces parallel to each other with a predetermined gap, facing downward. Each of the cutting blades is characterized in that the tip of the facing surface has a substantially V-shape with an acute angle, and both sides of the V-shape are blades. is there.

[0006]

[Function] When cutting out a sheet, both legs are opened at a predetermined angle, and the rotatable leg that can be folded inside is bent at an appropriate angle, and the parallel facing surfaces of both cutting blades are cut perpendicularly to the sheet surface. In this state, move the rotary leg in a circle around the shaft leg in this state. Then, the width of the ring to be cut out corresponds to the distance between the facing surfaces, and the width becomes constant from the upper surface to the lower surface.

Further, since the tip of the facing surface of the cutting blade is V-shaped and both sides of the V-shape are blades, the rotary leg is rotated clockwise or counterclockwise around the shaft leg. The sheet can be cut into a ring shape by moving it around either side.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a ring cutting tool 1 of the present invention comprises two legs 2 and 3 (one is called a shaft leg and the other is called a rotary leg for convenience) which can be opened and closed at any angle. In order to attach an attachable / detachable attachment 4 to the rotary leg 3, hold the upper parts of both legs 2 and 3 with fingers and move the rotary leg 3 around the shaft leg 2 in a circle. The attachment 4 cuts the sheet into a ring shape. The sheet to be cut at this time is made of a flexible rubber having a thickness of about 10 mm or less, and the ring formed from this sheet is used as packing for preventing oil leaks from automobile engines and water leaks from water pipes, for example. To do.

The tip portion 5 of the shaft leg 2 is sharpened to pierce the seat, while the rotary leg 3 has a mounting portion 6 for mounting the attachment 4 in the middle portion, which is bent inward through a pin 7. The attachment 4 can be cut perpendicularly to the seat surface by adjusting the bending angle. The upper portions of the legs 2 and 3 are openably and closably coupled by a shaft 8, and the upper portions of the intermediate portions of the legs 2 and 3 are connected by a screw 10 with a disc-shaped knob 9 so that the legs can move. , Adjust the open / close angle of both legs 2 and 3 by turning knob 9,
Set the diameter of the ring to be cut out.

The attachment 4 is composed of an insertion portion 12 which is inserted into a fitting hole 11 formed in the mounting portion 6 of the rotary leg 3 and a cutting portion 13 which cuts out a sheet into a ring shape, and the insertion portion 12 has a cylindrical shape. On the other hand, the cutting part 13 has an elliptical flange 14 continuous with the lower end of the insertion part 12, and a pair of sharp cutting blades 15 and 15 are provided on the lower side of the flange 14 and their facing surfaces 16 and 16 are constant. They are opposed to each other in a parallel state with a space of 17 between them.

The space 17 between the facing surfaces 16 and 16 corresponds to the width of the ring to be cut out, and is formed in advance to have one space width set within the range of about 5 mm to 10 mm. Therefore, when the present cutting tool is used, several types of attachments 4 having different intervals 17 are prepared, and the attachments 4 are reattached and used according to the width of the ring to be cut out to make rings with different widths. It is a thing.

As shown in FIG. 2, each of the cutting blades 15 has a substantially V-shape with the tip of the facing surface 16 having an acute angle, and the back side is shaved to be thin so that both sides of the V-shape are formed. Sharp blade 1
It is 8 and 18. Thereby, the sheet can be cut out even if the rotary leg 3 is moved clockwise or counterclockwise with respect to the axial leg 2.

The attachment 4 has an insertion portion 12 thereof.
Is inserted into the fitting hole 11 of the mounting portion 6 of the rotary leg 3 and screwed to fix the two cutting edges 15 and 15 of the cutting portion 13.
The ring is fixed so that it can be cut out. In the screwing structure, the rotary leg 3 is provided with a screw hole 19 communicating with the fitting hole 11 on the side surface of the lower portion thereof, while the insertion portion 12 of the attachment 4 has a circular portion at its intermediate portion. It has a recess 20 in the shape of a weight, and the fitting hole 1 of the mounting portion 6
While inserting the insertion part 12 of the attachment 4 into 1,
The screw hole 19 of the mounting portion 6 and the recess 20 of the insertion portion 12 are aligned with each other, the fixing bolt 21 is screwed into the screw hole 19, and the pointed tip of the fixing bolt 21 is pressed against the recess 20 of the insertion portion 12 to make it inseparable. To do.

In the present cutting tool with the attachment 4 thus mounted, the mounting portions 6 of the rotary leg 3 are bent at an appropriate angle, so that the facing surfaces 16, 16 of the two cutting blades 15, 15 are opposed to each other.
Is cut perpendicular to the seat surface, and the width of the ring to be cut out is a constant width from the upper surface to the lower surface of the ring.

[0015]

The ring cutting tool of the present invention cuts a sheet with a blade to form a ring, so that the cut surface is prepared, and when cutting the ring, the parallel facing surfaces of both cutting blades are cut. Since the sheet is vertically cut at a predetermined distance from the sheet surface, the sheet can be vividly cut with a constant width from the upper surface to the lower surface, and a highly accurate ring can be formed.

Further, each cutting blade has a V-shaped tip portion on the opposite surface, and both sides of the V-shaped blade are blades, so that the rotary leg is rotated clockwise or counterclockwise around the shaft leg. You can cut out the seat into a ring shape by moving it around, and you can change the opening angle of both legs to change the diameter of the ring you want to cut out. Is.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a ring cutting tool of the present invention.

FIG. 2 is a perspective view of a main part of FIG.

[Explanation of symbols]

 2 Shaft leg 3 Rotating leg 4 Attachment 11 Fitting hole 12 Insertion part 13 Cutting part 15 Cutting edge 16 Opposing surface 17 Predetermined interval (spacing) 18 blade

Claims (1)

[Claims] 1. A ring cutting tool for cutting a sheet into a ring shape, wherein a shaft leg (2) and a rotary leg (3) are openably and closably connected at an arbitrary angle, and the rotary leg (3) is capable of being center-folded. In addition, the attachment (4) is attached to the lower part of the attachment (4), and the attachment (4) is inserted into the fitting hole (11) provided in the lower part of the rotary leg (3). 12) and a pair of cutting blades (15, 15) in the lower part of the insertion part (12), the facing parts (16, 16) being opposed to each other in a parallel state with a predetermined distance (17) between them, and a cutting part. (13), each of the cutting blades (15) has a substantially V-shape in which the tip of the facing surface (16) has an acute angle, and both sides of the V-shape have blades (18, 1).
8) The ring cutting tool characterized in that