JPH0347785Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a chamfering tool used for cleaning work after drilling in machining. In a workpiece that is U-shaped and has a gap closed on one side, a hole that opens vertically into the gap is formed in the upper and lower bent parts, and then the opening end of the hole into the gap is machined. It relates to a tool for chamfering.

[Conventional technology]

A conventional example of this type of chamfering work will be explained below based on FIGS. 4 to 6.

FIG. 4 is a perspective view of a workpiece A to be chamfered after drilling. The side surface shape seen from the direction of arrow A is U-shaped, one side (the left side in FIG. 4) is closed, and the space between the upper and lower bent portions C and D is narrow. In this workpiece A, after machining the vertical holes E in the upper and lower bent parts C and D, the removal (chamfering) of the burr part F around the opening end to the inside (gap part) is performed in the fifth step.
This is done as shown in FIG.

That is, in FIG. 5, a special tool 50 such as an ear pick is inserted into the hole E of the workpiece A, and the blade part 51 on the inside of the tip is applied to the burr part F and rotated as shown by the arrow B to remove the burr part. F is removed and chamfered.

In addition, in Fig. 6, a tool 60 called a sasaba is inserted between the bent parts C and D, and the blade part 61 on one side of its tip is applied to the burred part F, and the work is performed by rotating it as shown by the arrow C. It's summery.

[Problem that the invention attempts to solve]

However, when using the conventional tools 50, 60, there are the following problems.

First, although the tool 50 shown in FIG. 5 can remove the burr F over the entire circumference of the hole E,
As shown in Figures a, b, and c, the blade part 51
Due to the difference in the contact angle of
There will be variations in the chamfer width and angle.

Further, according to the tool 60 in FIG. 6, since the workpiece A is closed on one side, the tool 60 as shown in FIG.
0 cannot be rotated around the entire circumference, and the portions that cannot be chamfered are somehow processed using a file or the like, but in this case as well, there are variations in the finished product of the processed portion G. Furthermore, according to the tool 60 in FIG. 6, the opening position of the hole E, the dimension of the gap between the upper and lower bent parts C and
Depending on the dimensions of the tool 60, the blade portion 61 may not reach the hole E, or when inserting the tool 60, the blade portion 61 may accidentally hit the inner surfaces of the bent portions C and D, causing damage.

[Means for solving problems]

Therefore, the present invention allows the tool to be rotated at a maximum angle of approximately 180 degrees, allowing anyone to chamfer the entire circumference of a hole at that operating angle, making it easy for anyone to finish the chamfer with the same width and angle. The problem was solved by a first body in the shape of an elongated plate or a rod, and a second body in the shape of a long and thin plate.
A gripping part is formed at the rear end of each of the main bodies, a connecting part is provided protruding inside the middle part of each of these main bodies, and these connecting parts are connected via a connecting pin in a direction substantially perpendicular to the longitudinal direction of the main body. The two main bodies are rotatably connected, and the front end inner surfaces of the two main bodies can be brought into contact with and separated from each other, and a return spring that biases the front end inner surfaces of the two main bodies in a direction that brings them into contact is interposed between the two main bodies. An adjustable positioning stopper is provided between the two bodies to set a dimension between the front ends when the grip portion is held against the grip and the front ends of the two bodies are separated, and a catch is provided on the outside of the front end of the first body. a groove portion that is rotatably provided and that opens to the outside of the front end portion of the second main body;
A support pin is provided in this groove in a direction substantially parallel to the connecting pin, and the base of a chamfer cutter, which has a pyramidal or conical shape and has a plurality of blades extending from the bottom to the apex at approximately equal intervals on its outer surface, is supported in the groove. It is attached to a pin.

[Effect]

According to the above technical means, in a normal state, the rear end (grip part) of the main body is separated by the biasing force of the return spring, and the inner surface of the front end of the main body is in contact with each other. A chamfered cutter can be inserted between the upper and lower bent portions C and D (gap portion) of the workpiece A.

For example, when removing the burr F around the inner opening of the hole E formed in the upper bent part C, the first
When the catch provided on the outside of the front end of the main body is brought into contact with the inner surface of the lower bent part D and the grip part is squeezed, the main body swings around the connecting pin, the grip parts approach each other, and the front ends open. The tip of the chamfer cutter attached to the outside of the second body comes into contact with the hole E, and at this time the chamfer cutter swings around the support pin parallel to the connecting pin, so the chamfer cutter fits in the center of the hole E. The axis of the chamfered cutter can be maintained approximately at right angles to the opening surface of the hole E. Therefore, when the main body is rotated in this set state, the chamfer angle will always be constant. This angle is determined by the angle of the blade with respect to the axis of the chamfer cutter.

In addition, since the chamfering cutter has multiple blades arranged at approximately equal intervals, the rotation angle of the main body during the chamfering work described above only needs to be approximately 180 degrees at most.
Even if the workpiece A is closed on one side, the entire circumference of the hole E can be chamfered easily.

Furthermore, the dimension between the front ends of the main body can be adjusted using a positioning stopper, and once it is set in consideration of each dimension of the workpiece A, any workpiece A with the same dimensions and shape can have the same chamfer width. It can be done.

In addition, since the receiving seat on the outside of the front end of the first main body is rotatable, the contact surface thereof will not be damaged when the main body is rotated.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In FIG. 1 showing the overall side surface, 1 and 2 are elongated plate-shaped first and second bodies, each having a grip portion 11, 21 at its rear end (the right end in FIG. 1), and Connecting parts 12, 2 inside each midway part
2 is installed protrudingly.

These connecting parts 12 and 22 are rotatably connected by a connecting pin 30, and the connecting pin 30 is attached in the longitudinal direction of the main bodies 1 and 2 (left-right direction in Fig. 1).
(the width direction of the main bodies 1 and 2). Due to this pin connection, the main bodies 1 and 2 can swing freely, and their front ends (the left end in FIG. 1) can freely come into contact with each other and separate from each other.

A return spring 31 is interposed behind the position of the connecting pin 30 of the main bodies 1 and 2, and its biasing direction is a direction in which the inner surfaces of the front end portions of the main bodies 1 and 2 are brought into contact.

A positioning stopper 32 is provided protruding inside the first main body 1 on the rear side of the position of the return spring 31, and this stopper 32 is located at its tip position 32a.
is adjustable, and depending on the adjustment, the main body 1, 2
When the front end of the front end is opened, its dimensions can be set.

A catch seat 19 is rotatably provided on the outside of the front end of the first body 1.

In addition, as shown in the enlarged perspective view in FIG.
A groove 25 opening outward is formed in the front end of the main body 2, and a support pin 26 is fixed in the left-right direction of the groove 25, that is, in a direction parallel to the connecting pin 30, and the base of the chamfer cutter 27 is fixed to the support pin 26. 27a
is rotatably attached to the shaft, and the chamfer cutter 27 is swingable around the support pin 26. This chamfering cutter 27 has a hexagonal pyramid shape, and six blades 27b are arranged at approximately equal intervals from the bottom to the apex. Note that the opening end of the groove portion 25 is finished with a curved surface.

FIG. 1 shows a normal state, in which the gripping portions 11 and 21 at the rear end are separated by the urging force of the return spring 31, and the inner surfaces of the front end are in contact with each other.

In this normal state, as shown in FIG.
Insert between D (gap area). Furthermore, this figure 3a
In this case, the hole E of the upper bent portion C is chamfered.

Bring the catch 19 into contact with the inner surface of the lower bent portion D,
When the grips 11 and 21 are grasped, the bodies 1 and 2 swing around the connecting pin 30, opening the front ends, and the chamfered cutter 27 comes into contact with the hole E, as shown in FIG. 3b.

When the grips 11 and 21 are further squeezed a little, the chamfered cutter 27 swings about the support pin 26, and the axis of the cutter 27 coincides with the center of the hole E, as shown in FIG. 3c.

In this set state, as shown in Fig. 3d, the main body 1,
2 is rotated approximately 60 degrees, the burr F around the opening of the hole E is removed, and chamfering of the entire circumference of the inner opening of the hole E is completed.

When the force applied to the gripping parts 11, 21 is released, the main bodies 1, 2 return to the state shown in FIG.

Note that the embodiments of the above embodiments may be modified as follows.

-Main bodies 1 and 2 are rod-shaped instead of plate-shaped.

- Reverse the mounting position of the return spring 31 and the positioning stopper 32.

- The mounting position of the return spring 31 is set to the front side of the connecting pin 30 (on the left side in FIG. 1), and the return spring 31 is set as a tension spring.

- Attach the positioning stopper 32 to the second main body 2 side.

- Attach the positioning stopper 32 to both main bodies 1 and 2.

- Attach rubber, etc. to the contact surface (outer surface) of catch seat 19.

- The support pin 26 is rotatably provided in the groove 25,
The base 2 of the chamfer cutter 27 is attached to this support pin 26.
Fix 7a.

- The attachment of the support pin 26 to the groove portion 25 and the attachment of the chamfer cutter 27 to the support pin 26 are both rotatable.

- The shape of the chamfered cutter 27 is a conical shape.

- The number of blades 27b of the chamfer cutter 27 is not 6 but 2 to 5 or 7 or more.

〔effect〕

As shown in the above embodiments, according to the chamfering tool of the present invention, the chamfering cutter 27 is attached to the groove 25 via the support pin 26 parallel to the connecting pin 30, so that the main body 1, 2 to bring the chamfering cutter 27 into contact with the hole E, the chamfering cutter 27 swings around the support pin 26 and its axis can be aligned with the center of the hole E, so that no one can do the work. However, the chamfer angle can always be kept constant and can be easily made. In addition, positioning stopper 3
2 and once the opening dimensions of the front ends of the main bodies 1 and 2 are set, the chamfer width can always be kept constant and easily, regardless of who is working on it. Furthermore, since the blades of the chamfer cutter 27 are arranged at approximately equal intervals, the rotation angle of the main bodies 1 and 2 is approximately 180 at maximum.
This makes it possible to easily chamfer the entire circumference of the opening of the hole E even in a narrow space where one side is closed.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic side view of an embodiment of the present invention;
Fig. 2 is a partially enlarged exploded perspective view of the same embodiment, Figs. 3 a to d are explanatory diagrams of the use state of the same embodiment, Fig. 4 is a perspective view of the workpiece A to be chamfered, Figs. FIG. 6 is an explanatory diagram of different conventional examples, and FIGS. 7 a to 7 c and FIG. 8 are explanatory diagrams of problems in the same conventional examples. 1...First main body, 2...Second main body, 11, 21
...Gripping part, 12, 22...Connection part, 19...Socket, 25...Groove part, 26...Support pin, 27...
Chamfer cutter, 30...Connection pin, 31...Return spring, 32...Positioning stopper.

Claims (1)

[Scope of utility model registration request] A first body in the shape of an elongated plate or a rod, and a second body in the shape of a long and thin plate.
A gripping part is formed at the rear end of each of the main bodies, a connecting part is provided protruding inside the middle part of each of these main bodies, and these connecting parts are connected via a connecting pin in a direction substantially perpendicular to the longitudinal direction of the main body. The two main bodies are rotatably connected, and the front end inner surfaces of the two main bodies can be brought into contact with and separated from each other, and a return spring that biases the front end inner surfaces of the two main bodies in a direction that brings them into contact is interposed between the two main bodies. An adjustable positioning stopper is provided between the two bodies to set a dimension between the front ends when the grip portion is held against the grip and the front ends of the two bodies are separated, and a catch is provided on the outside of the front end of the first body. a groove portion that is rotatably provided and that opens to the outside of the front end portion of the second main body;
A support pin is provided in this groove in a direction substantially parallel to the connecting pin, and the base of a chamfer cutter, which has a pyramidal or conical shape and has a plurality of blades extending from the bottom to the apex at approximately equal intervals on its outer surface, is supported in the groove. A chamfering tool characterized by being attached to a pin.