JPH0533921U - Flaring tools - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent troubles caused by excessive return while maintaining the meshed state of the external thread and the internal thread at the return end of the shaft. A flare that flares by rotating a shaft 8 while advancing and retracting the shaft 8 by moving a male screw body 21 connected to a shaft 8 forward and backward with respect to a female screw body 6 fixed to a body 1. In the ring tool, when the shaft 8 reaches the return end, the female screw body 6
So that the male screw body 21 idles with respect to the male screw body 21.
The non-screw portion 21c is provided at the tip of the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flaring tool for processing a flare portion of a flare joint used for air conditioning piping and the like.

[0002]

[Prior Art]

 Conventionally, as this flaring tool, those shown in FIGS. 3 to 6 have been known.

To explain this, 1 is a body, and the lower part of this body 1 is fixed to a gauge bar 2 having a processing hole 2a with a tightening screw 3. Reference numeral 4 is a tightening handle, and 5 is a pipe material such as a copper pipe 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 portion 7 a is screwed onto the female screw body 6 from the upper side.

A shaft 8 is inserted through the center of the male screw body 7. The tip (lower end) of the shaft 8 is provided with a cone mounting portion 8a having a larger diameter than the others, and the cone mounting portion 8a is provided with a cone 9 as a flare processing portion that is offset from the shaft axis. It is rotatably attached with care and slightly tilted.

A coil spring 10 that transmits the thrust force of the male screw body 7 to the shaft 8 is provided between the cone mounting portion 8 a of the shaft 8 and the male screw body 7. Reference numeral 11 is a thrust washer interposed between the coil spring 10 and the cone mounting portion 8a, 12 is the same ball bearing, and 13 is a needle bearing for rotatably supporting the shaft 8 in the body 1.

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

Further, the handle 14 is provided with a plunger 16 at a position deviated from the center in a state of being pressed by the spring 17 toward the head portion 7a of the male screw body 7, and the plunger 16 is provided with the male screw body. The handle 14 and the male screw body 7 are connected to each other in a state in which the handle 14 is fitted in the plunger fitting hole 18 provided in the head portion 7a.

In this state, the rotating force of the handle 14 is transmitted to the male screw body 7 together with the shaft 8, and the male screw body 7 is screwed back and forth with respect to the female screw body 6.

A concave groove 16a is provided on the outer peripheral surface of the plunger 16, 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 has a uniform shape. It is locked so that it can move in the axial direction with a stroke.

As shown in FIGS. 5 and 6, the lower end surface 16b of the plunger 16 is formed as an inclined surface which is inclined forward with respect to 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 with the handle 14 and the screwing force of the male screw body 7 is increased. It is transmitted to the shaft 8 via the spring 10.

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

FIG. 3 shows a state in which this flare processing is completed, and when the handle 14 is further tightened from this state, the male screw body 7 is further screw-moved with respect to the shaft 8 which cannot be further lowered. While the spring 10 is being compressed, the shaft 8 continues to rotate on the spot.

When the spring 10 is contracted by a predetermined amount in this way, the male screw head 7a is separated from the handle 14 as shown in FIG. 6, so that the plunger 16 slightly fits into the plunger fitting hole 18 only at the lower end. It becomes a state. Therefore, when the handle 14 is further tightened from this state, the plunger 16 is disengaged from the plunger fitting hole 18 by the action of the lower end inclined surface 16b.

Therefore, thereafter, the handle 14 idles while the plunger 16 moves in and out of the plunger fitting hole 18 every one rotation. This clutch action prevents the flared portion from being damaged due to an excessive load.

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

Therefore, the handle 14 is pushed up by the male screw body 7, and the shaft 8 moves backward (ascends) 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 8 a of the shaft 8 contacts the lower end surface of the female screw body 6 as shown in FIG. Stops rising.

[0020]

[Problems to be solved by the device]

 In this case, according to the conventional flaring tool, with the shaft 8 reaching the maximum retracted position (hereinafter referred to as the return end) as shown in FIG. ) Portion is screwed into the female screw body 6.

Here, as shown in the figure, the manual flaring tool in which the handle 14 is always manually operated does not cause a 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 on the upper surface of the central portion of the handle 14 so that the handle 14 can be rotated by an electric rotary tool. Both manual and electric flaring tools have appeared.

In such a dual-purpose or electric-only tool, since the return end in FIG. 4 cannot be grasped, there is a problem that the handle fixing pin 15 or the like is broken due to excessive return.

If the screw portion 7b of the male screw body 7 is shortened and 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 body 7 and the shaft 8 are tilted in the unscrewed state, which causes a problem that the male screw body 7 is not screwed well with the female screw body 6 at the next tightening.

Therefore, the present invention provides a flaring tool capable of reliably preventing troubles due to excessive return while maintaining the meshing state of the male screw body and the female screw body at the return end of the shaft.

[0027]

[Means for Solving the Problems]

 According to the present invention, a male screw body is screwed to a female screw body fixed to the body, and a shaft having a flared portion at the tip is connected to the male screw body to move forward and backward in the axial direction as the male screw body moves forward and backward. In a flaring tool that is configured to be rotated while being provided with a stopper mechanism that regulates the maximum retracted position of this shaft, the shaft reaches the maximum retracted position by the threaded portion of the male screw body. In this state, the screw tip is formed in such a size that it is disengaged from the end of the female screw body, and a non-threaded portion is provided at the tip of this male screw body.

[0028]

[Action]

 According to the above configuration, since the threaded portion of the male screw body is disengaged from the female screw body at the maximum retracted position of the shaft, that is, at the return end, there is no risk of trouble such as breakage of the handle fixing pin due to excessive return in the case of electric type ..

Moreover, at this time, since the non-threaded portion of the male screw body is fitted in the female screw body, these meshing states are maintained, and they are completely disengaged, which takes time to re-screw the male screw body, etc. The harmful effect of does not occur.

[0030]

【Example】

 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 designated by the same reference numerals, and their duplicate description will be omitted.

In this flaring tool, the screw portion 21b screwed into the female screw body 6 is provided on the outer circumference of the shaft portion of the male screw body 21 having the head portion 21a over a range from the head portion 21a side to the vicinity of the tip. In addition to being provided, a non-thread portion 21c is provided at a portion closer to the tip side than the screw portion 21b.

Here, as shown in FIG. 1, the threaded portion 21b is formed with a dimension L1 that allows the shaft 8 to be detached from the female screw body 6 when the shaft 8 reaches the return end, and in the state of FIG. 21c is fitted to the upper end portion of the female screw body 6, and the engaged state of the male screw body 21 and the female screw body 6 is maintained.

The dimension L2 of the non-threaded portion 21c is such that a sufficient fitting margin can be obtained so that the male screw body 21 is held in the upright state in the state of FIG. Is about 25.5 mm, it may be about 5.0 mm).

Further, a tool hole 14a into which an electric tool is inserted is provided on the upper surface of the central portion of the handle 14.

With such a configuration, even when the shaft 8 reaches the return end during the tightening operation of the handle 14 and the tightening operation is further performed, the non-threaded portion 21c of the male screw body 21 is the female screw body 6 of the male screw body 21. Since it is only rotated inside, the three members of the handle 14, the shaft 8 and the male screw body 21 will idle on the spot.

Therefore, at the time of operating the handle with the electric tool, there is no possibility of causing trouble such as the handle fixing pin 15 breaking due to excessive return.

Further, since the male screw body 21 is maintained in the meshed state with the female screw body 6 by the non-threaded portion 21c, when the handle 14 is next tightened, the screw portion 21b is immediately screwed into the female screw body 6. Then, the tightening operation is started immediately.

By the way, in the above 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, but this stopper mechanism is different from these. You may comprise by the member.

Further, in the above embodiment, the flaring tool provided with the clutch mechanism for preventing the excessive tightening of the shaft 8 is taken as an example, but the present invention does not have such a clutch mechanism, It can also be applied to a device in which 8 and the male screw body 21 are directly connected by a pin or the like.

[0041]

[Effect of the device]

 As described above, according to the present invention, since the threaded portion of the male screw body is disengaged from the female threaded body at the return end of the shaft, and the non-threaded portion is fitted to the female threaded body It is possible to reliably prevent trouble such as breakage of the handle fixing pin due to excessive return.

Moreover, in this state, the non-threaded portion can maintain the meshing state of the male screw body and the female screw body, so that they can be immediately screwed again at the time of the next tightening operation. In other words, at the returning end of the shaft, the male screw body is completely disengaged from the female screw body, and the re-screwing is not troublesome.

[Brief description of drawings]

FIG. 1 is a partial 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 in 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.

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

FIG. 6 is a cross-sectional view of a state in which 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 that also serves as a part of stopper mechanism 21 Male threaded body 21b Male threaded part 21c Non-threaded part of male threaded body 8 Shaft 8a Cone mounting part of shaft that also serves as a part of stopper mechanism 9 Flare processing part Cone 14 handle

Claims (1)

[Scope of utility model registration request] 1. 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 this male screw body, and the male screw body is axially moved forward and backward together with the screw forward and backward movement. In a flaring tool that is configured to rotate while being provided with a stopper mechanism that regulates the maximum retracted position of the shaft,
The threaded portion of the male screw body is formed to have a size such that the screw tip deviates from the end portion of the female screw body when the shaft reaches the maximum retracted position, and a non-threaded portion is provided at the tip end portion of the male screw body. A flaring tool characterized by