JP3863038B2 - Flare forming tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flare forming tool for forming a flare at an end of a metal pipe in piping work for an air conditioner or the like.
[0002]
[Prior art]
As this type of conventional flare forming tool, there is known a type in which a spreading handle is pressed against an end of a pipe by rotating a rotary handle.
[0003]
However, in such a conventional flare forming tool, it is necessary to keep turning the handle in one direction when forming the flare. Therefore, in the flare forming process, the handle must be changed many times, and the inside of the air conditioner There was a problem that it was difficult to work in a narrow work space.
[0004]
An example of a flare forming tool that can solve this problem is disclosed in Japanese Utility Model Publication No. 7-53787. As shown in FIG. 8, the flare forming tool (1) has a ratchet between a rotating portion (3) rotated by a handle (2) and a core rod (4) to which a spreading roller is attached. A rotational force transmission part (5) having a mechanism is provided, and a switching knob (6) for switching the transmission direction of the rotational force is provided on the head of the handle (2).
[0005]
According to this prior art, it is not necessary to change the handle (2) in the flare forming process, and therefore work in a narrow work space is facilitated. However, since the switching knob (6) was provided on the head of the handle (2), the palm of the hand holding the handle (2) hits the switching knob (6), and the handle (2) was being rotated. There was a risk that the switching knob (6) would switch accidentally.
[0006]
[Problems to be solved by the invention]
Therefore, an object of the present invention is to provide a flare molding tool that can easily perform a flare molding operation even in a narrow work space and can prevent erroneous operation of the switching knob due to hand movement.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, “a cylindrical core rod (16) having an expansion roller (26) attached to one end portion and a core rod (16) mounted on the other end portion of the core rod (16)” is provided. (16) is provided with a handle (20) for transmitting rotational force, and the rotation roller (26) is pressed against the metal pipe (12) by the rotation of the handle (20), and the flare is applied to the end of the metal pipe (12). In the flare forming tool (10) for forming (14), the other end portion of the core rod (16) is larger than the outer diameter of the small-diameter portion (30a) through the cylindrical thin-diameter portion (30a). cylindrical large-diameter operation portion having an outer diameter (30) is formed, the handle (20), it said and accommodating portion for accommodating the large diameter working part (30) (62) is formed, accommodated First and second one-way clutches (72) and (74) that operate in opposite directions are attached to the inner surface of the part (62) and gripped only on the outer peripheral surface of the large- diameter operating part (30). The core rod (16) is arranged on the side surface of the other end so that it can protrude and immerse. Has a set has been locking pin (32), the handle (20), first and second circumferential grooves formed at intervals in the axial direction on the inner surface of the housing portion (62) (68) ( has 70), the first one-way clutch (72) is operable when the locking pin (32) is fitted in the first circumferential groove (68), the locking pin (32) is first The flare forming tool (10) ", when the second one-way clutch (74) is operable when fitted in the two circumferential grooves (70) .
[0008]
In the present invention, when the position of the first one-way clutch (72) is adjusted to the position of the large-diameter operating part (30), the first one-way clutch (72) can grip the large-diameter operating part (30). Become. In this state, when the handle (20) is rotated forward and backward alternately in one direction (for example, clockwise) and in the opposite direction (counterclockwise), the core rod (16) is moved in one direction ( For example, it is rotated clockwise, and in the opposite direction (counterclockwise), it rotates idly and the core rod (16) is intermittently screwed toward the metal tube (12). As a result, the expansion roller (26) is pressed against the end of the metal tube (12) and is rotated so as to expand the end, thereby forming the flare (14).
[0009]
After the formation of the flare (14) is completed, the handle (20) is slid in the axial direction with respect to the core rod (16), and the position of the second one-way clutch (74) is moved to the large diameter operating portion (30). The second one-way clutch (74) can grip the large-diameter operating portion (30). In this state, when the handle (20) is rotated forward and backward alternately in one direction (for example, clockwise) and in the opposite direction (counterclockwise), it rotates idly when it is clockwise. (16) is rotated in a direction opposite to the one direction (for example, counterclockwise), and the spreading roller (26) is separated from the end of the metal tube (12).
In the present invention, since the locking pin (32) is fitted into the first circumferential groove (68) or the second circumferential groove (70) , when the handle (20) is rotated , the locking pin (32) is locked. The pin (32) moves while being guided by these grooves (68) (70) .
[0010]
According to the second aspect of the present invention, “a cylindrical core rod (80) having an expansion roller (26) attached to one end portion thereof and a core rod (80) attached to the other end portion of the core rod (80)” (80) is provided with a handle (82) for transmitting a rotational force, and the expansion roller (26) is pressed against the metal pipe (12) by the rotation of the handle (82), and the flare is applied to the end of the metal pipe (12). In the flare forming tool (88) for forming (14), first and second one-way clutches (76, 78) operating in opposite directions are provided at the other end of the core rod (80). The handle (82) is mounted in two stages side by side in the axial direction, and the handle (82) accommodates the first and second one-way clutches (76, 78) and is slidable in the axial direction. A housing portion (84) in which an inner collar portion (86) for gripping only one of the first and second one-way clutches (76), (78) is formed on the inner peripheral surface , Shin杆 (80), the protruding-death to the other end side Has a freely disposed a locking pin (32), the handle (20), first and second circumferential grooves formed at intervals in the axial direction on the inner surface of the housing portion (62) ( 68) (70) , and when the locking pin (32) is fitted in the first circumferential groove (68) , the first one-way clutch (72) becomes operable, and the locking pin (32 ) Is a flare forming tool (88) "that allows the second one-way clutch (74) to be actuated when fitted in the second circumferential groove (70) .
[0011]
In the present invention, when the position of the inner collar portion (86) is adjusted to the position of the first one-way clutch (76), the inner collar portion (86) can grip the first one-way clutch (76). In this state, when the handle (82) is rotated forward and backward alternately in one direction (for example, clockwise) and in the opposite direction (counterclockwise), the core rod (80) is moved in one direction ( For example, it is rotated clockwise, and in the opposite direction (counterclockwise), it rotates idle and the core rod (80) is intermittently screwed toward the metal tube (12). As a result, the expansion roller (26) is pressed against the end of the metal tube (12) and is rotated so as to expand the end, thereby forming the flare (14).
[0012]
After the formation of the flare (14) is completed, the handle (82) is slid in the axial direction with respect to the core rod (80), and the position of the inner collar portion (86) is moved to that of the second one-way clutch (78). When aligned, the inner collar portion (86) can grip the second one-way clutch (78). In this state, when the handle (82) is rotated forward and backward alternately in one direction (for example, clockwise) and in the opposite direction (counterclockwise), it rotates idly in the clockwise direction. (80) is rotated in a direction opposite to the one direction (for example, counterclockwise), and the spreading roller (26) is separated from the end of the metal tube (12).
In the present invention, since the locking pin (32) is fitted into the first circumferential groove (68) or the second circumferential groove (70) , when the handle (20) is rotated , the locking pin (32) is locked. The pin (32) moves while being guided by these grooves (68) (70) .
[0015]
【The invention's effect】
According to the invention described in claim 1 or claim 2, by rotating the handle alternately forward and backward in one direction (for example, clockwise) and in the direction opposite to the one direction (counterclockwise), The core rod can be intermittently screwed with respect to the metal tube, and can be intermittently screwed by the same operation. In addition, the transmission direction of the rotational force can be switched only by sliding the handle in the axial direction with respect to the core rod. Therefore, it is not necessary to change the handle in the flare forming process, and the work in a narrow work space such as in the air conditioner is facilitated.
[0016]
And since the mechanism which switches the transmission direction of a rotational force exists inside an accommodating part, the problem of erroneous operation like the past does not arise.
[0017]
Further, since the so fitting the engagement pin to the first or second circumferential groove, can accurately position the first or second one-way clutch with respect to the large-diameter operation portion or the inner brim portion In addition, the turning operation of the handle can be stabilized by the locking pin that moves along the first or second circumferential groove.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2, a flare forming tool (10) according to an embodiment of the present invention forms an inverted conical flare (14) at the end of a metal tube (12). (16), a holding part (18), a handle (20) and the like.
[0019]
The core rod (16) has a cylindrical main body (24), and one end (lower end in FIG. 2) of the main body (24) has an inverted conical shape pressed against the end of the metal tube (12). The expansion roller (26) is mounted eccentrically with respect to the central axis of the main body (24) so as to be freely rotatable. A male screw portion (28) is formed at the center of the main body (24), and the other end (see FIG. 2 (upper end portion 2), a mounting portion (24a) to which the handle (20) is mounted, a large-diameter operating portion (30) to which a rotational force is applied from the handle (20), and a mounting portion (24a) A small-diameter portion (30a) that connects the diameter actuating portion (30) is formed.
[0020]
The mounting portion (24a), the large-diameter operating portion (30), and the small-diameter portion (30a) are formed in a cylindrical shape with a smooth outer surface, and the outer diameter of the large-diameter operating portion (30) is the small-diameter portion (30a) Is set to be larger than the outer diameter. A locking pin (32) having a spherical tip is disposed on the side surface of the attachment portion (24a) so as to protrude and immerse from the radial side surface. That is, as shown in FIG. 3, a hole (34) is formed on the side surface of the mounting portion (24a), and a coil spring (36) is mounted on the bottom of the hole (34) to compress the coil spring (36). Thus, the locking pin (32) is inserted into the hole (34).
[0021]
The holding portion (18) holds the metal pipe (12) through the pipe holder (38), and as shown in FIG. 2, a downwardly opening groove (40) is formed at the lower end portion of the holding portion. A recessed groove is provided on the inner surface of the groove (40) facing the fitting groove (44) into which the pipe holder (38) is fitted, and a side wall portion constituting the fitting groove (40). A screw hole (46) is formed on one side of (40a), and a tightening screw (48) is screwed into the screw hole (46). A through hole (50) having one end opened at the bottom surface of the groove (40) is formed in the central portion of the holding portion (18), and an inner surface of the core hole (16) is formed on the inner surface of the through hole (50). A female screw part (52) to which the male screw part ( 28 ) is screwed is formed.
[0022]
The pipe holder (38) selectively holds a plurality of metal tubes (12) of different sizes, and is composed of two holding portions (54) of a rod shape or a long plate shape as shown in FIG. One end is pivotally attached to the shaft (54b) so as to be opened and closed. A plurality of clamping holes (56) of different sizes are formed at predetermined intervals in the longitudinal direction on the clamping surface (54a) of each clamping part (54), and the clamping surface (54a) of one clamping part (54) is formed. A plurality of positioning holes (58) corresponding to the respective clamping holes (56) are formed on the side surface opposite to ().
[0023]
Then, as shown in FIG. 2, the pipe holder (38) holding the metal pipe (12) is fitted into the groove (44) of the holding portion (18), and the holding portion (18) is tightened by the tightening screw (48). ). At this time, the tip of the clamping screw (48) is pressed against the positioning hole (58), so that the metal tube (12) and the core rod (16) sandwiched between the pipe holders (38) become coaxial and expand. The opening roller (26) is positioned so as to be able to press the inner side of the end of the metal tube (12).
[0024]
As shown in FIG. 3, the handle (20) has a cylindrical accommodation portion (62) that rotatably accommodates the end portion of the core rod (16). The accommodating portion (62) includes a cylindrical first accommodating portion (64) that accommodates the attachment portion (24a), and a cylindrical second accommodating portion (66) that accommodates the large-diameter operating portion (30). The first circumferential groove (68) and the second circumferential groove (70) are formed in two stages in the axial direction on the inner surface of the first housing part (64), and the second housing part (66) A first one-way clutch (72) and a second one-way clutch (74) are firmly attached to the inner surface in two stages in the axial direction. And the knob (22) is provided in the outer surface of the 2nd accommodating part (66). In this embodiment, the first housing portion (64) and the second housing portion (66) are joined by the screw (75), but they may be configured as an integral object.
[0025]
In the first circumferential groove (68) and the second circumferential groove (70), the locking pin (32) of the core rod (16) is detachably fitted. And formed continuously over the entire circumference of the inner surface of the first housing part (64). The cross-sectional shape of the first circumferential groove (68) and the second circumferential groove (70) is set to a shape that becomes shallower toward the groove edge, such as a semicircle or a triangle. That is, the locking pin (32) is set to a shape that can be easily transferred between the first circumferential groove (68) and the second circumferential groove (70).
[0026]
As shown in FIG. 4, the first one-way clutch (72) has a ring-shaped clutch body (72a) having an inner diameter slightly larger than the outer diameter of the large-diameter operating portion (30). A plurality (seven in this embodiment) of grooves (72b) extending in the axial direction are formed on the inner surface of 72a). Each groove (72b) has a bottom surface (72b3) that becomes wider in the first direction in FIG. 4, and a cylindrical roller (72c) is accommodated in each groove (72b). Yes. Further, a leaf spring (72d) for pressing the roller (72c) to the narrow side is attached to the wide end of each groove (72b).
[0027]
When the first one-way clutch (72) is positioned outside the large-diameter operating part (30), the roller (72c) elastically contacts the outer peripheral surface of the large-diameter operating part (30), and the large-diameter operating part (30) Hold the outer surface. In this state (the state shown in FIG. 4), when the accommodating portion (62) is rotated in the first direction (clockwise), the roller (72c) elastically contacts and rolls on the outer surface of the large-diameter operating portion (30). It moves, moves relative to the narrow side (72b1) in the groove (72b), and is pressed toward the inner surface of the large-diameter actuating part (30). As a result, the first one-way clutch (72) and the large-diameter operating portion (30) are firmly locked. On the other hand, when the accommodating portion (62) is rotated in the second direction (counterclockwise) opposite to the first direction, the roller (72c) elastically contacts and rolls on the outer surface of the large-diameter operating portion (30). Then, it moves in the groove (72b) to the wide side (72b2), the pressure applied to the inner surface of the large-diameter actuating part (30) is released, and it slides as a bearing, so that the lock is released. Accordingly, the large-diameter operating part (30) is rotated when the accommodating part (62) is rotated in the first direction (clockwise), and the large-diameter operating part (when rotating in the second direction (counterclockwise)) 30) idles and the core rod (16) is intermittently screwed toward the end of the metal tube (12).
[0028]
As shown in FIG. 5, the second one-way clutch (74) has a ring-shaped clutch body (74a) having an inner diameter slightly larger than the outer diameter of the large-diameter operating portion (30). ) Are formed with a plurality of (seven in this embodiment) grooves 74b extending in the axial direction. Each groove (74b) has a bottom surface that widens in the second direction (counterclockwise), and a cylindrical roller (74c) is accommodated in each groove (74b). Further, a leaf spring (74d) for pressing the roller (74c) to the narrow side is attached to the wide end of each groove (74b).
[0029]
When the second one-way clutch (74) is positioned outside the large-diameter operating part (30), the roller (74c) elastically contacts the outer peripheral surface of the large-diameter operating part (30) and the large-diameter operating part (30) Grip the outer periphery. In this state (the state shown in FIG. 6), when the accommodating portion (62) is rotated in the second direction (counterclockwise), the roller (74c) is pushed by the outer surface of the large-diameter actuating portion (30). The inside of (74b) is moved to the narrow side and pressed toward the inner surface of the large-diameter actuating part (30). As a result, the second one-way clutch (74) and the large-diameter operating portion (30) are firmly locked. On the other hand, when the accommodating part (62) is rotated in the first direction (clockwise), the roller (74c) is pushed by the outer surface of the large-diameter operating part (30) and moves in the groove (72b) to the wide side. Then, the pressure applied to the inner surface of the large-diameter actuating part (30) is released and slides as a bearing, so that the lock is released. Accordingly, the large-diameter operating part (30) is rotated only when the accommodating part (62) is rotated in the second direction (counterclockwise), and the large-diameter operating part is rotated when the accommodating part (62) is rotated in the first direction (clockwise). (30) idles and the core rod (16) is intermittently screwed off from the end of the metal tube (12).
[0030]
Referring to FIG. 3, the distance from the first one-way clutch (72) to the first circumferential groove (68) and the second one-way clutch (74) to the second circumferential groove (70). Is set to be the same as the distance from the large-diameter operating portion (30) to the locking pin (32). Therefore, when the locking pin (32) is fitted in the first circumferential groove (68), the first one-way clutch (72) is positioned with respect to the large-diameter operating portion (30), and the locking pin When (32) is fitted in the second circumferential groove (70), as shown in FIG. 6, the second one-way clutch (74) is positioned with respect to the large-diameter operating portion (30).
[0031]
When forming the flare (14) at the end of the metal tube (12) using the flare forming tool (10), first, as shown in FIG. 1, a pipe holder (38) holding the metal tube (12) is used. ) Is attached to the fitting groove (44) of the holding part (18). Subsequently, the handle (20) is held and the transmission direction of the rotational force is set so that the core rod (16) moves forward. That is, as shown in FIG. 3, the locking pin (32) is fitted into the first circumferential groove (68), and the first one-way clutch (72) is moved relative to the large-diameter operating portion (30). Position.
[0032]
Then, the knob (22) is operated to rotate the handle (20) alternately forward and backward in the first direction (clockwise) and the second direction (counterclockwise). Then, the large-diameter actuating part (30) is rotated in the first direction (clockwise), the core rod (16) is intermittently screwed and rotated eccentrically with respect to the central axis (24) of the core rod (16). The expansion roller (26) attached freely is pressed against the inner surface of the end of the metal tube (12) while rotating in a circumferential direction. As a result, the flare (14) is formed at the end of the metal tube (12).
[0033]
When the flare molding is finished, the handle (20) is pulled in the direction opposite to the advancing direction of the core rod (16), and the locking pin (32) is shifted to the second circumferential groove (68). That is, as shown in FIG. 6, the second one-way clutch (74) is positioned with respect to the large-diameter operating portion (30). Since the locking pin (32) can be displaced to the back of the hole (34), the shifting operation of the locking pin (32) is easy.
[0034]
Then, the knob (22) is operated to rotate the handle (20) alternately forward and backward in the first direction (clockwise) and the second direction (counterclockwise). Then, the large diameter working part (30) is rotated in the second direction (counterclockwise), the core rod (16) is intermittently screwed, and the expansion roller (26) is moved from the end of the metal tube (12). Torn apart.
[0035]
When the expansion roller (26) is completely pulled away from the end of the metal pipe (12), the pipe holder (38) is removed from the holding part (18), and the metal pipe (12) is removed from the pipe holder (38). .
[0036]
According to this embodiment, since it is not necessary to change the handle (20) in the flare (14) forming process, it is easy to work in a narrow work space such as in an air conditioner. In addition, since the mechanism for switching the transmission direction of the rotational force is provided inside the accommodating portion (62), an erroneous operation of the switching operation can be prevented.
[0037]
Further, since the locking pin (32) is fitted in the first circumferential groove (68) or the second circumferential groove (70), the first one-way clutch (72) or the second one-way The clutch (74) can be accurately positioned with respect to the large-diameter operating portion (30), and the turning operation can be stabilized.
[0038]
In the above-described embodiment, the holding portion (18) holds the metal tube (12) via the pipe holder (38), but the holding portion that holds the metal tube (12) is held. The metal tube (12) may be directly held by the holding portion (18) by forming the portion (18).
[0039]
In addition, a clutch mechanism that idles when a predetermined torque is applied may be incorporated in the core rod (16) so that the fact that the formation of the flare (14) has been completed can be known by idling of the clutch mechanism.
[0040]
Further, the positional relationship between the first one-way clutch (72) and the second one-way clutch (74), and the positions between the first circumferential groove (68) and the second circumferential groove (70). The relationship may be reversed from the above embodiment.
[0041]
In the above-described embodiment, an example in which two one-way clutches (72) and (74) that operate in opposite directions are installed on the handle (20) side, but the outer surface operates as shown in FIG. The first and second one-way clutches (76) and (78) are attached in two stages so as to operate in opposite directions to each other in the axial direction of the core rod (80) and the other end (80a). Accommodates the first and second one-way clutches (76), (78) and is slidable in the axial direction. Either of the first and second one-way clutches (76), (78) is provided on the inner peripheral surface thereof. The housing part (84) formed with the inner collar part (86) for gripping only one is used as a recessed flare molding tool (88), and the handle (82) is displaced in the axial direction of the core collar (80). Accordingly, the one-way clutches (76) and (78) held by the inner collar portion (86) may be switched.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a flare forming tool according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is an enlarged cross-sectional view showing a handle (during forward operation).
4 is a cross-sectional view taken along line IV-IV in FIG.
5 is a cross-sectional view taken along line VV in FIG.
FIG. 6 is an enlarged cross-sectional view showing a handle (during backward operation).
FIG. 7 is an enlarged sectional view showing another embodiment of the present invention.
FIG. 8 is a perspective view showing a conventional technique.
[Explanation of symbols]
(10)… Flare forming tool
(12)… Metal pipe
(14)… Flare
(16) ... Core
(18)… Holding part
(20)… Handle
(22) ... Knob
(30)… Large diameter working part
(30a) ... Narrow diameter part
(32) ... Locking pin
(68) ... First circumferential groove
(70) ... Second circumferential groove
(72) ... First one-way clutch
(74) ... Second one-way clutch
(76) ... (Externally operated type) First one-way clutch
(78) ... (Externally actuated) second one-way clutch
(80) ... Core
(82)… Handle
(84)… Container
(86)… Inner buttock

Claims (2)

A cylindrical core with a spreading roller attached to one end, and a handle that is attached to the other end of the core and transmits a rotational force to the core, and the rotation of the handle In a flare forming tool that presses a spreading roller against a metal tube and forms a flare at the end of the metal tube,
The other end of the core rod, via a cylindrical small-diameter portion, the large diameter working part cylindrical having a larger outer diameter than the outer diameter of the small-diameter portion is formed, before Symbol handle Is formed with an accommodating portion that accommodates the large-diameter operating portion, and the inner surface of the accommodating portion grips only the outer peripheral surface of the large- diameter operating portion, and operates in opposite directions to each other. One-way clutch is attached in two stages ,
The core rod has a locking pin that is protruded and retracted on the side surface of the other end portion, and the handle is formed on the inner surface of the housing portion with an interval in the axial direction. 2 circumferential grooves, and when the locking pin is fitted in the first circumferential groove, the first one-way clutch is operable, and the locking pin is in the second circumferential direction. A flare forming tool that allows the second one-way clutch to be actuated when fitted in a groove. A cylindrical core with a spreading roller attached to one end, and a handle that is attached to the other end of the core and transmits a rotational force to the core, and the rotation of the handle In a flare forming tool that presses a spreading roller against a metal tube and forms a flare at the end of the metal tube,
Wherein the other end of the core rod, the first and second one-way clutch to operate in opposite directions, the attached in two stages are arranged in the axial direction of the core rod, the prior SL handles the The first and second one-way clutches are accommodated and slidable in the axial direction, and an inner collar portion for gripping only one of the first and second one-way clutches is formed on the inner peripheral surface of the first and second one-way clutches. The receiving part is recessed ,
The core rod has a locking pin that is protruded and retracted on the side surface of the other end portion, and the handle is formed on the inner surface of the housing portion with an interval in the axial direction. 2 circumferential grooves, and when the locking pin is fitted in the first circumferential groove, the first one-way clutch is operable, and the locking pin is in the second circumferential direction. A flare forming tool that allows the second one-way clutch to be actuated when fitted in a groove.

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