JP2549686Y2 - Flaring tools - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flaring tool for processing a flared portion of a flared joint used for air conditioning piping or the like.

[0002]

2. Description of the Related Art Conventionally, the flaring tool shown in FIGS. 3 to 6 is known.

[0003] To explain this, reference numeral 1 denotes a body, and a lower portion of the body 1 is fixed to a gauge bar 2 having a processing hole 2a with a tightening screw 3. Reference numeral 4 denotes a fastening handle, and reference numeral 5 denotes a tube material to be processed such as a copper tube to be flared.

A female screw body 6 is fixed to the upper part of the body 1, and a cylindrical male screw body 7 having a head 7a is screwed into the female screw body 6 from above.

The male screw body 7 has a shaft 8 at the center.
Is inserted. Tip (lower end) of this shaft 8
Is provided with a cone mounting portion 8a having a larger diameter than the other. A cone 9 as a flare processing portion is rotatably mounted on the cone mounting portion 8a in a state of being eccentric with respect to the shaft axis and slightly inclined. Have been.

[0006] A coil spring 10 is provided between the cone mounting portion 8 a of the shaft 8 and the male screw body 7 to transmit the thrust of the male screw body 7 to the shaft 8. Numeral 11 denotes a thrust washer interposed between the coil spring 10 and the cone mounting portion 8a, 12 denotes a ball bearing, 1
Reference numeral 3 denotes a needle bearing that rotatably supports the shaft 8 in the body 1.

On the other hand, the shaft 8
A handle 14 for rotating is fixed by a pin (spring pin) 15.

A plunger 16 is attached to the handle 14 at a position off center by a spring 17.
The handle 14 and the male screw body 7 are connected in a state where the plunger 16 is fitted into a plunger fitting hole 18 provided in the male screw body head 7a. .

In this state, the rotational force of the handle 14 is transmitted to the male screw 7 together with the shaft 8, and the male screw 7 moves forward and backward with respect to the female screw 6.

The outer peripheral surface of the plunger 16 is provided with a concave groove 16.
a is provided, and the tip of the pin 19 attached to the upper end of the shaft 8 is fitted into the concave groove 16a, so that the plunger 16 is prevented from falling out in a state where it can move in the axial direction with a constant stroke. .

As shown in FIGS. 5 and 6, the lower end surface 16b of the plunger 16 is formed as an inclined surface which inclines upward in the handle rotation direction in which the male screw body 7 is tightened.

In this configuration, when the handle 14 is operated in the tightening direction (the direction of the solid line arrow in FIG. 3), the shaft 8 and the male screw body 7 rotate integrally therewith, and the male screw body 7 is rotated.
Is transmitted to the shaft 8 via the spring 10.

As a result, the shaft 8 moves forward (down) while rotating, and flaring by the cone 9 is performed.

FIG. 3 shows a state in which the flare processing is completed. When the handle 14 is further tightened from this state, the male screw 7 is further screwed to the shaft 8 which cannot be further lowered. The shaft 8 continues to rotate in place while the spring 10 is compressed.

When the spring 10 is contracted by a predetermined amount,
As shown in FIG. 6, when the male screw body head 7a separates from the handle 14, only the lower end of the plunger 16 is slightly fitted into the plunger fitting hole 18. Therefore, when the handle 14 is further tightened from this state, the plunger 16 is moved to the lower end inclined surface 16b.
Of the plunger fitting hole 18.

Thereafter, the handle 14 idles while the plunger 16 moves in and out of the plunger fitting hole 18 for each rotation. By this clutch action, the flared portion is prevented from being damaged by an unnecessary load.

Next, when the handle 14 is tightened back in the direction of the dashed arrow in FIG. 3, the turning force of the handle is transmitted to the male screw 7 from the state of FIG. 6 in which the plunger 16 has entered the plunger fitting hole 18. The male screw body 7 retreats, the compressed spring 10 is loosened, and the male screw body head 7a comes into close contact with the lower surface of the handle 14 as shown in FIG.

For this reason, the handle 1 is formed by the male screw body 7.
4 is pushed up, and the shaft 8 moves backward (up) while rotating.

When the cone 9 reaches the tightening end position sufficiently separated from the gauge bar 2, the upper surface of the cone mounting portion 8a of the shaft 8 comes into contact with the lower end surface of the female screw body 6 as shown in FIG. Stops rising.

[0020]

In this case, according to the conventional flaring tool, when the shaft 8 reaches the maximum retracted position (hereinafter referred to as a return end) as shown in FIG. Is in a state of being screwed into the female screw body 6 at the screw tip (tip) portion.

As shown in the figure, the flare tool for manual operation, in which the handle 14 is always manually turned, does not cause any problem because the operation is actually stopped when the handle operation becomes heavy.

However, recently, in order to improve work efficiency and reduce labor, a tool insertion hole is provided in the upper surface of the central portion of the handle 14 so that the handle 14 can be rotated by an electric rotary tool.・ Electric and electric flaring tools are emerging.

In such a dual-purpose or electric-only tool, since the return end in FIG. 4 cannot be grasped, a trouble such as the handle fixing pin 15 or the like being broken due to excessive return has occurred.

The threaded portion 7b of the male screw body 7 is shortened,
If the screw portion 7b is detached from the female screw body 6 when the shaft 8 reaches the return end, the above trouble does not occur.

However, in this case, the male screw 7 and the shaft 8 are tilted in a state where the screw is disengaged, so that there is a problem that the male screw 7 is not properly screwed into the female screw 6 at the next tightening.

Accordingly, the present invention provides a flaring tool that can reliably prevent the occurrence of trouble due to excessive return while maintaining the engaged state of the external thread and the internal thread at the return end of the shaft.

[0027]

According to the present invention, a male screw body is screwed to a female screw body fixed to a body, and a shaft having a flared portion at the tip is connected to the male screw body. In a flaring tool, which is configured to be able to rotate while moving forward and backward in the axial direction together with the forward and backward movement, and provided with a stopper mechanism that regulates the maximum backward position of the shaft, the thread portion of the external thread body is formed as described above. When the shaft reaches the maximum retracted position, the threaded end is formed to have a size deviating from the end of the female threaded body, and a non-threaded portion is provided at the tip of the male threaded body.

[0028]

According to the above construction, the maximum retreat position of the shaft,
In other words, since the screw portion of the male screw body is disengaged from the female screw body at the return end, there is no possibility that trouble such as breakage of the handle fixing pin due to excessive return will occur in the case of the electric type.

Moreover, at this time, since the non-threaded portion of the male screw body is fitted to the female screw body, these meshing states are maintained, and they are completely disengaged and it takes time to re-thread the male screw body. No adverse effects are caused.

[0030]

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

In this embodiment, the same parts as those of the conventional flaring tool shown in FIGS. 3 to 6 are denoted by the same reference numerals, and the description thereof will not be repeated.

In this flaring tool, the head 2
A threaded portion 21b screwed to the female threaded body 6 is provided on the outer periphery of the shaft portion of the male threaded body 21 having the threaded portion 1a from the head 21a side to the vicinity of the tip.
A non-screw portion 21c is provided in a portion on the distal end side from b.

Here, as shown in FIG. 1, the threaded portion 21b is formed to have a dimension L1 that will come off the female screw body 6 when the shaft 8 reaches the return end. 21c is fitted to the upper end of the female screw body 6, and the meshing state between the male screw body 21 and the female screw body 6 is maintained.

The dimension L2 of the non-threaded portion 21c is
The size is set such that a sufficient margin for fitting can be obtained so that the male screw body 21 is held upright in the state of FIG. 1 (for example, when the total length of the shaft portion is 25.5 mm, it may be about 5.0 mm). Have been.

A tool hole 14a into which a power tool is inserted is provided on the upper surface of the central portion of the handle 14.

With this configuration, the handle 14
When the shaft 8 reaches the return end at the time of the tightening operation, the male screw body 21 is in a state in which the non-threaded portion 21c simply rotates within the female screw body 6 even if the screwing operation is further performed. , The shaft 8 and the externally threaded body 21 idle on the spot.

Therefore, when the handle is operated by the electric tool, there is no possibility of occurrence of troubles such as breakage of the handle fixing pin 15 due to excessive return.

Further, since the male screw body 21 is kept engaged with the female screw body 6 by the non-threaded part 21c, when the handle 14 is tightened next, the screw part 21b is immediately screwed into the female screw body 6. Immediately, the tightening operation is started.

In the above-described embodiment, the stopper mechanism for stopping the shaft 8 at the return end is constituted by the cone mounting portion 8a of the shaft 8 and the female screw body 6. However, this stopper mechanism is provided by another member. May be configured.

In the above embodiment, the flaring tool provided with a clutch mechanism for preventing the shaft 8 from being excessively tightened is taken as an example. However, the present invention does not have such a clutch mechanism, and The present invention can also be applied to a structure in which the male screw body 21 is directly connected with a pin or the like.

[0041]

As described above, according to the present invention, the threaded portion of the male screw is disengaged from the female screw at the return end of the shaft, and the non-threaded portion is engaged with the female screw. In the case of the electric type, occurrence of troubles such as breakage of the handle fixing pin due to excessive return can be reliably prevented.

Further, in this state, the meshing state between the male screw body and the female screw body can be maintained by the non-threaded portion, so that they can be immediately screwed again at the next tightening operation. That is, at the return end of the shaft, there is no adverse effect such that the male screw body is completely removed from the female screw body and it takes time to re-screw them.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a flaring tool according to an embodiment of the present invention.

FIG. 2 is a perspective view of a male screw body of the tool.

FIG. 3 is an overall sectional view of a conventional flaring tool.

FIG. 4 is a partial cross-sectional view showing a tightened state of the tool.

FIG. 5 is a sectional view taken along line VV of FIG. 3;

FIG. 6 is a cross-sectional view of a state where the operation from the state of FIG. 5 to the tightening end is performed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Body 6 Female threaded body which also serves as a part of stopper mechanism 21 Male threaded body 21b Threaded part of male threaded body 21c Non-threaded part of male threaded body 8 Shaft 8a Cone attachment part of shaft which also serves as part of stopper mechanism 9 Flare processing part Cone 14 handle

Claims (1)

(57) [Scope of request for utility model registration] A male screw body is screwed to a female screw body fixed to a body, and a shaft having a flared portion at its tip is connected to the male screw body. In a flaring tool that is configured to be able to rotate while rotating, and provided with a stopper mechanism that regulates the maximum retreat position of the shaft,
The threaded portion of the male screw body is formed to have a size such that the screw tip is disengaged from the end of the female screw body when the shaft reaches the maximum retracted position, and a non-threaded portion is provided at the tip of the male screw body. A flaring tool characterized by the following.