JPS634576Y2 - - Google Patents

Description

[Detailed description of the invention] "Purpose of the invention" (Field of industrial application) The present invention is a die that is used when simultaneously installing concentric male and female screws at the end of an open pipe of a faucet fitting. and a tap holder.

(Prior Art) FIG. 1 is a side sectional view showing a conventional holder (hereinafter referred to as a conventional holder) that can hold both a die 3 and a tap 2. In this conventional holder, a die 3 is fitted into the distal end surface 1a of the holder main body 1, and the die 3 is secured to the circumferential wall of the distal end thereof by bolts 6, 6, . . .
It was becoming more and more crowded. Further, the inside of the holder main body 1 is hollow, and the tap 2 is fixed to the hollow portion via a tapered sleeve 5. Therefore, when carving a male screw and a female screw on the open pipe end 4a of a faucet fitting such as the discharge pipe 4, rotate the holder main body 1 at a low speed, and press the die 3 (or the tap 2). )but,
It was pressed so that the open pipe end 4a of the discharge pipe 4 coincided with the open pipe end 4a.

(Problem to be solved by the invention) In the conventional holder, the die 3 was fixed using a plurality of bolts 6, 6,... There were cases where the machine became eccentric from the axis of rotation. Therefore, faucet fittings processed using conventional holders have had the disadvantage that the wall thickness at the end of the open pipe becomes unbalanced.

The present invention has been developed in view of the above circumstances, and is designed to prevent the fixed state of the die (and tap) from being eccentric from the rotational axis of the holder body, and The purpose of the present invention is to provide a holder for dies and taps (hereinafter referred to as the "proposed holder") that prevents uneven thickness from occurring at the end of an open pipe when simultaneously carving a male screw and a female screw on a pipe, etc. do.

"Structure of the invention" (Means for solving the problem) The gist of the proposed holder is to use a die and The tap holder consists of a holder body with a shank protruding from the base, and an annular nut that is screwed onto the peripheral wall near the tip of the holder body, and a die backing stepped portion is provided on the tip of the holder body. A die fitting opening and a cavity portion into which a tapered sleeve for holding a tap is fitted are formed at the back of the die fitting opening, centered on the axis of rotation of the shank, and a peripheral wall near the tip end of the holder body is A plurality of diameter-reducing slits having a length approximately corresponding to the outer diameter of the die are drilled through the die insertion opening and the cavity so as to be equally spaced on the distal end surface of the holder body, and the base end of the diameter-reducing slit is A stress dispersion hole with a diameter larger than the width of the slit is bored, and a male screw for the annular nut is carved on the outer circumferential surface of the holder body closer to the tip end surface than the corresponding part of the die insertion opening. The inner circumferential surface of the annular nut has a circumferential diameter-reduced surface that presses the circumferential wall of the distal end surface of the holder body on the distal end side of the female screw corresponding to the male screw of the holder body.

(Function) In the holder body, both the die fitting opening for fixing the die and the hollow portion for holding the tap (taper sleeve) are formed so as to be centered on the axis of rotation of the shank in the holder body. .

The die holding structure is such that the die fitting opening of the holder body is reduced in diameter, and the inner circumferential surface of the die fitting opening is pressed into contact with the outer circumferential surface of the die. The diameter-reducing structure of the die insertion opening is such that a plurality of diameter-reducing slits are bored in the circumferential wall near the tip of the holder body so that the tip surface, that is, the die insertion opening, is evenly distributed. The peripheral wall near the surface is divided into equal widths. These divided peripheral walls of equal width are pressed by the peripheral wall diameter reducing surface of the annular nut, and are narrowed to the center thereof. Therefore, the die fitted into the die fitting hole of the holder main body is pressed evenly with almost the entire outer circumferential surface toward the center, so that the original center of the die fitting hole is There is no risk of it shifting after fixing.

By the way, in the proposed die, when the diameter of the die fitting opening of the holder main body is reduced, a large contact area between the inner circumferential surface of the die fitting opening and the outer circumferential surface of the die can be secured. The length of the diameter-reducing slit was set to approximately correspond to the outer diameter of the die. Therefore, each divided peripheral wall of the holder main body can withstand a large diameter reduction even when inclined at a gentle angle, the contact area is secured, and a strong fixed state can be obtained. Incidentally, a stress dispersion hole is required at the base end of the diameter-reducing slit to prevent damage to the holder body. Furthermore, a circumferential wall diameter reducing surface is formed on the distal end side of the annular nut so that each divided circumferential wall in the holder main body can be uniformly reduced in diameter over the entire circumference of the distal end surface of the holder main body. That is, on the circumferential wall of the holder main body near the distal end surface, the position where the annular nut is screwed is set to the outer circumferential surface closer to the shank than the corresponding part of the die fitting opening, avoiding the corresponding part of the die fitting opening.

(Example) The present invention will be described below based on drawings showing examples thereof.

FIG. 2 is an exploded side sectional view of the first embodiment of the holder of the present invention. The proposed holder consists of a holder body 7 and an annular nut 8.

The holder main body 7 includes a shank 10 protruding from a base 9c of a cylindrical body 9. The shank 10 is shaped like a round bar and is used for attachment to a rotary head of a drilling machine (see FIG. 4), a milling machine, a lathe (all not shown), and the like. Therefore, the shank 10 serves as a reference for the axis of rotation of the holder. A die fitting opening 11 corresponding to the outer shape of the die 3 is bored in the distal end surface 9b of the body portion 9. The die fitting opening 11 is approximately 1/10 mm larger than the outer diameter of the die 3.
The die 3 is formed to have a relatively large diameter, so that the die 3 can be attached and detached extremely easily (generally,
It is well known that if there is a gap of 1/10 mm between the male and female parts that fit together, the male and female parts will become loose.) In the holder main body 7, the back of the die fitting opening 11 is formed into a cavity with a backing stepped portion 11a for the die 3 interposed therebetween. The cavity is for accommodating a taper sleeve 5 that holds the tap 2, and a taper hole 13 corresponding to the taper sleeve 5 is formed. The die fitting opening 11 and the tapered hole 13 of the cavity are both connected to the holder main body 7 (shank 1).
It is formed around the rotation axis of 0). Note that the backing stepped portion 11a provided in the die insertion opening 11 comes into contact with the die back surface 3a when the die 3 is loaded, and prevents the die 3 from penetrating into the cavity. This is for guiding the die 3 so that it is held perpendicularly to the axis of rotation of the holder body 7 to some extent. The tapered hole 13 provided in the cavity of the holder body 7 is penetrated to the outside through the shank hole 10, and when replacing the tap 2, etc., a rod-shaped tool (not shown) is inserted from the proximal end of the shank 10. The tapered sleeve 5 can be inserted and removed.

A diameter-reducing slit 12 is formed in the peripheral wall of the holder body 7 near the distal end surface 9b along the axis of rotation of the holder body 7. The diameter-reducing slit 12 has a length approximately corresponding to the outer diameter of the die 3, and extends to both the die insertion opening 11 of the holder body 7 and the cavity.
A stress dispersion hole 12a having a diameter larger than the width of the slit is bored at the base end of the diameter-reducing slit 12. As shown in the front view in FIG. 3, a plurality of diameter-reducing slits 12 (eight in this embodiment) are provided so as to be equally distributed on the tip end surface 9b of the holder body 7. Therefore, in the distal end of the holder main body 7, the divided peripheral wall formed between the diameter-reducing slits 12 exhibits a certain degree of elasticity, making it easy to bend. Moreover, since the stress due to this bending is dispersed by the stress dispersion hole 12a, the holder body 7
will not be damaged.

The annular nut 8 is adapted to be screwed into the peripheral wall of the holder main body 7 near the distal end surface 9b. The annular nut 8 has a tapered end and a cylindrical base end. Then, a circumferential wall diameter reducing surface 8b is formed on the inner circumferential surface of the tapered portion.
is formed, and a female screw 8a is carved on the inner peripheral surface of the cylindrical portion. On the other hand, the holder main body 7 has a peripheral wall closer to its tip end surface 9b formed into a tapered surface 9d, and a male screw 9a is carved on the outer peripheral surface closer to the shank 10 than the tapered surface 9d. ing. In this embodiment, when the annular nut 8 is screwed into the holder body 7, the peripheral wall diameter reduction surface 8b of the annular nut 8 easily presses the tapered surface 9d of the holder body 7 in the diameter reduction direction. The taper angle on both sides was set to approximately 15° so that

Explain how the main holder is used. With the tap 2 held in the taper sleeve 5 in advance, the taper sleeve 5 is loaded into the cavity of the holder body 7. Naturally, the center of the tap 2 is aligned with the rotational axis of the holder body 7 (shank 10). Next, the die 3 is fitted into the die fitting opening 11 of the holder main body 7, and the annular nut 8 is further tightened. When the annular nut 8 is further tightened, the peripheral wall reduced diameter surface 8b formed on the inner circumferential surface on the distal end side presses against the tapered surface 9d of the holder body 7.
Therefore, the peripheral wall of the holder main body 7 near the distal end surface 9b is connected to the distal end groove portion 12 of each diameter-reducing slit 12.
The width of the groove b becomes narrower, resulting in a reduced diameter state as a whole. Therefore, the die 3 in the die fitting opening 11 is fixed so that substantially the entire outer circumferential surface thereof is evenly pressed. In this way, the diameter of the die fitting port 11 is narrowed down evenly from the entire circumference, so the center of the die 3 after fixing is the same as the diameter of the die fitting port 11 before fixing. The center remains aligned with the axis of rotation of the shank 10 in the holder body 7. The merit holder set in this way is the fourth
As shown in the figure, it is attached to a drilling machine 14 or the like.
In addition, the reference numeral 15 in the figure is a vice for holding the discharge pipe 4.

(Study of Alternative Embodiments) FIG. 5 is a side sectional view showing a second embodiment of the holder of the present invention. The second embodiment is most different from the first embodiment in the contact structure of the annular nut 8 with the peripheral wall 9e of the distal end surface of the holder main body 7. In the second embodiment, a protrusion 17 having a semicircular cross section is formed in an annular shape on the peripheral wall 9e of the distal end surface of the holder main body 7. On the other hand, on the distal end side 8c of the annular nut 8, a protrusion 16 having a semicircular cross section is formed in an annular shape on its inner peripheral surface. Therefore, when the annular nut 8 is retightened to the holder body 7, the protrusion 16 of the annular nut 8 tightens against the holder body 7.
The peripheral surface comes into contact with the protrusion 17 of. Therefore, the peripheral wall 9e of the distal end surface of the holder main body 7 is reduced in diameter, and the peripheral surface of the protrusion 16 of the annular nut 8 at this time acts as a peripheral wall diameter reducing surface. In the second embodiment, the backing step portion 11a for the die 3 provided in the die fitting opening 11 of the holder main body 7 is formed into a short protrusion shape, and the backing step portion 11a is formed in a short protrusion shape.
a are positioned at equal intervals within the die fitting opening 11. In this way, the configuration and shape of the holder of the present invention can be changed as appropriate depending on the embodiment.

"Effects of the Invention" As is clear from the above explanation, according to the die and tap holder according to the present invention, the center of the die (and tap) remains away from the axis of rotation of the shank in the holder body even after it is fixed. There is no eccentricity, and concentric male and female screws can now be carved into the open pipe ends of faucet fittings. Therefore, there is no risk of uneven thickness at the open pipe end of the faucet fitting. Further, in the fixed state of the die, substantially the entire outer circumferential surface of the die is pressed toward the center (in the radial direction of the die). This pressing force has a line of action that is different from the male screw engraving stress (acting in the circumferential direction of the die) due to the die, and maintains an extremely strong fixed state. Moreover, since the directions of action of the pressing force and the male screw cutting stress are different, there is no problem such as the die being loosened or tightened to the point that it cannot be released during the male screw cutting process. Does not occur. Furthermore, the die insertion opening of the holder body fixes the die by reducing its diameter, and if the annular nut is not tightened,
Since the storage space is 0.10 mm larger than the outside diameter of the die, it has many excellent advantages, such as the ability to insert and remove the die from the die insertion opening extremely smoothly. have.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing the conventional holder, Fig. 2 is an exploded side sectional view showing the first embodiment of the proposed holder, Fig. 3 is a front view of the first embodiment, and Fig. 4 is the first embodiment. FIG. 5 is a perspective view showing how the embodiment is used, and FIG. 5 is a side sectional view showing the second embodiment of the holder according to the present invention. 2...Tap, 3...Dice, 4...Discharge pipe (faucet fitting), 4a...Open pipe end, 5...Taper sleeve, 7...Holder body, 10...Shank, 9a...... Male screw, 9b...tip surface, 9c...
... Base, 11 ... Die fitting opening, 11a ... Backing step, 12 ... Slit, 12a ... Stress dispersion hole, 8 ... Annular nut, 8a ... Female screw, 8b ...
...Peripheral wall diameter reduction surface.

Claims (1)

[Scope of utility model registration request] A die and tap holder for simultaneously installing a concentric male screw and a female screw on the open pipe end of a faucet fitting, the holder body has a shank protruding from the base, and the holder body has a shank protruding from its base, an annular nut screwed into the peripheral wall; a die fitting opening provided with a die backing step on the distal end surface of the holder body; and a cavity in the back of the die fitting opening into which a tap holding taper sleeve is fitted. A diameter-reducing slit with a length approximately corresponding to the outer diameter of the die is formed in the circumferential wall of the holder body near the tip end through the die insertion opening and the cavity. A plurality of stress dispersion holes are bored in the distal end of the holder body so as to be equally distributed, and a stress dispersion hole with a diameter larger than the width of the slit is bored at the base end of the diameter reducing slit, and a stress dispersion hole with a diameter larger than the width of the slit is bored in the peripheral wall near the distal end of the holder body. A male screw for the annular nut is carved on the outer peripheral surface closer to the shank than the corresponding part of the die insertion opening, and a female screw for the annular nut is carved on the inner peripheral surface of the annular nut, which corresponds to the male screw of the holder body. A holder for dies and taps, characterized in that a diameter-reducing peripheral wall surface is formed on the leading end side of the holder body to press against the peripheral wall of the leading end face of the holder body.