JP2012101296A - Tool for tongueless coil thread - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool for a tongueless coil thread which tool is simplified in structure to have less number of components, thereby achieving cost reduction.SOLUTION: The tool 1 for the tongueless coil thread is used to fit or remove a tongueless coil thread insert having a cutout formed on an inner screw on a coil end, to or from a fitting hole. The tool 1 includes a columnar mandrel 2 having an external thread portion 5 formed on its side periphery for holding the tongueless coil thread insert and a groove 6 opening toward the side periphery and formed along the axial direction of the mandrel 2; and a pawl 3 having a hook 8 on its front end, the pawl 3 being inserted in the groove 6 of the mandrel 2. The pawl 3 is formed integrally with a spring 7 that energizes the hook 8 to project from an opening 6a of the groove 6 at the front end of the mandrel 2.

Description

  The present invention relates to a tool for tongueless coil threads for attaching or removing a tongueless coil thread insert to or from a tap hole of another member.

A tongueless coil thread insert made of a conventional wire (a wire / coil-like screw insert) is a coil in which an outer screw and an inner screw are formed on an outer peripheral surface and an inner peripheral surface, respectively. A notch for attachment or detachment is formed at both ends.
The tool for tongueless coil thread is for attaching / detaching the insert to / from the tapped hole (mounting hole) of another member by applying a driving force (rotational force) to the notch of the tongueless coil thread insert. It is. A tongueless coil thread insert that is attached to the mounting hole by such a tool for a tongueless coil thread is widely used when forming a female screw on a member having insufficient hardness, and is later folded for hooking at the time of insertion. It is characterized by the fact that there is no necessary tongue from the beginning.

  As a tool for tongueless coil threads, a mandrel is inserted and arranged in a tubular body so that the tip of the tubular body projects from the tubular body and the projecting dimension can be adjusted. A groove having an opening on the side surface of the mandrel is formed along the axis, and a long pawl having a hook portion at the tip is inserted and disposed in the groove, and the pawl has an intermediate portion via a pin. The hook portion is attached to the mandle so that the hook portion can be protruded and retracted from the opening of the groove at the tip of the mandle when the mandrel is rotated, and the hook portion is normally in the groove. A biasing member that biases the groove so as to protrude from the opening of the groove, and the groove extends straight along the axis of the mandle from at least the portion where the pin is located to the tip. What is opening including the opening and out of the hook portion is provided to be continuous (e.g., see Patent Document 1).

  According to this tongueless coil thread tool, the opening of the groove in which the pawl is mounted includes the opening from which the hook portion of the pawl protrudes, so that when the groove is machined, there is a step inside. It does not occur and the pawl is prevented from causing a rotation failure. In addition, the grinding process for removing the step of the groove processing part, which has been conventionally required, is not required, and the number of processing steps is reduced, so that the cost can be reduced and the cost can be reduced. Further, since the number of openings is smaller than that in the prior art, the strength of the mandle can be increased.

Japanese Patent Application Laid-Open No. 11-333751

By the way, although the above-mentioned tool for tongueless coil threads is very excellent in terms of function as described above, there is a problem that the mechanism becomes complicated and the cost is high due to the large number of parts constituting the part.
Further, in the tongueless coil threading tool described above, if the hole from the pin (pawl rotation shaft) formed in the mandole to the opening position of the mandrel groove is not precisely machined, the pawl is displaced. End up. Then, since it is difficult to correct the misalignment, it cannot be used and may be disposed of. Therefore, since the yield rate is not increased, it is difficult to reduce the manufacturing cost.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a tool for a tongueless coil thread in which the configuration is simplified and the number of parts is reduced, thereby reducing the cost. It is in.

The tool for tongueless coil thread of the present invention is a tool for tongueless coil thread for attaching or removing the tongueless coil thread insertion body in which the notch is formed in the inner thread of the coil end to or from the mounting hole,
A cylindrical mandle in which a male screw part for holding the tongueless coil thread insertion body is formed on the side peripheral part, and a groove that opens to the side peripheral part side is formed along the axial direction thereof,
A pawl having a hook portion at the tip, which is inserted and disposed in the groove of the mandle,
The pawl is integrally formed with a spring portion that urges the hook portion to protrude from the opening of the groove at the tip of the mandrel.

  According to the tongueless coil thread tool, the spring portion for biasing the hook portion of the pawl so as to protrude from the opening portion of the groove is formed integrally with the pawl. Therefore, the configuration is simplified and the number of parts is reduced. Further, since the spring portion is formed integrally with the pawl, the conventional pin (the pawl rotating shaft) is not required, and the processing is facilitated.

In the tongueless coil thread tool, the pawl is preferably configured to be detachable in the groove.
If it does in this way, it will become possible to respond | correspond easily to both attachment and removal of a tongueless coil thread insertion body by providing for the attachment and removal for the said tongueless coil thread insertion body as a pawl, for example.

Further, the tongueless coil thread tool has a tubular housing provided with a throttle nut for narrowing the tongueless coil thread insertion body at a tip portion, and the tip portion of the mandrel is located with respect to the housing. It is preferable that the housing is inserted into the housing so as to be able to project and retract.
In this way, by attaching the tongueless coil thread insert to the mounting hole via the throttle nut, the tongueless coil thread insert that has been narrowed down by the nut can be attached to the state of the inlet of the mounting hole, the shape of the inlet, etc. It can be easily inserted into the mounting hole without being affected by the material of the member.

  According to the present invention, since the configuration is simplified and the number of parts is reduced, the cost can be reduced. In addition, since the conventional pin (pawl rotation shaft) is not required and the processing is facilitated, the cost can also be reduced.

It is a figure which shows one Embodiment of the tool for tongueless coil threads of this invention, (a) is a top view, (b) is a sectional side view, (c) is a front view. It is a figure which shows schematic structure of a pawl, (a), (c) is a side view, (b), (d) is a front view. (A)-(d) is a figure which shows the modification of a manddle, Comprising: (a) is a sectional side view, (b) is a front view, (c) is a top view, (d) is a front view. It is a side view of a guide plate. It is a figure for demonstrating rotation of the tongueless coil thread insertion body by a hook part. It is a figure which shows other embodiment of the tool for tongueless coil threads of this invention, (a) is a sectional side view, (b) is a top view, (c) is a rear view, (d) is a front view. .

The present invention will be described in detail below.
1A to 1C are views showing an embodiment of a tongueless coil thread tool according to the present invention. FIG. 1A is a plan view of the tongueless coil thread tool, and FIG. The figure (c) is also a front view. In these drawings, reference numeral 1 denotes a tongueless coil thread tool, and this tongueless coil thread tool (hereinafter referred to as a tool) 1 attaches or removes a tongueless coil thread insert, which will be described later, to a mounting hole. Is for.

That is, the tool 1 includes a cylindrical mandle 2, a pawl 3 provided in the mandle 2 as shown in FIG. 1B, and a handle 4 provided at the rear end of the mandle 2. It is configured.
The mandle 2 is formed with a male screw portion 5 for holding a tongueless coil thread insertion body, which will be described later, on the side peripheral portion on the tip side, and further with a groove 6 formed on the inside of the tip side. The groove 6 is formed along the axial direction of the manddle 2, and in this embodiment, as shown in FIGS. 1A to 1C, an opening 6 a is formed in the side peripheral part of the mandrel 2, An opening 6b is formed on the surface.

  As shown in FIGS. 2A and 2C, the pawl 3 is integrally formed with a spring portion 7 formed by bending a metal elongated plate material into a U shape and an end portion on one side of the spring portion 7. 1 and is inserted into the groove 6 of the mandrel 2 as shown in FIG. 1 (b). That is, the pawl 3 has its hook portion 8 and the other end portion of the spring portion 7 positioned on the distal end side of the manddle 2, and the hook portion 8 is located in or near the opening 6 a of the groove 6. It is located and arranged.

The spring portion 7 has a curved portion mainly exhibiting a spring property. Accordingly, as shown in FIG. 1B, the other end side of the spring portion 7 abuts against the bottom surface of the groove 6, so that the hook portion 8 on one end side protrudes from the opening 6 a of the groove 6. It is energized to do.
2 (a) and 2 (b) show a mounting pawl for attaching the tongueless coil thread insert to the mounting hole, and FIGS. 2 (c) and 2 (d) attach the tongueless coil thread insert. The removal pawl for removing from a hole is shown.

  The difference between these two types of pawls 3 is the configuration of the hook portion 8. Here, as shown in FIGS. 2B and 2D, the hook portion 8 is formed by a hook body 8a formed sharply toward one side of the spring portion 7, and a curved inner surface thereof. The hook body 8a is engaged with the notch of the tongueless coil thread insertion body and the notch is pressed by the engaging portion 8b, as will be described later. The coil thread insert is rotated and attached to the attachment hole, or removed from the attachment hole.

  2 (a) and 2 (b) and the detachable pawl 3 shown in FIGS. 2 (c) and 2 (d), the front ends of the hook bodies 8a are mutually connected to the spring portion 7. It is different in that it faces different side faces. As a result, the attaching pawl 3 and the removing pawl 3 are rotated in different directions with respect to the tongueless coil thread insert so that the hook body 8a is engaged with the notch of the insert. It has become.

  In the pawl 3 having such a structure, the hook portion 8 protrudes from the opening 6a of the groove 6 by the action of the spring portion 7 as described above. ), The front end side of the hook main body 8a protrudes into the male screw portion 5 of the mandrel 2.

  In the present embodiment, the pawl 3 is fixed in the groove 6 by a guide plate 9 and a lid plate 10 as shown in FIG. The guide plate 9 has a substantially L-shaped plate shape, and includes a base portion 9a that contacts the outer surface of the curved portion of the spring portion 7 of the pawl 3 and a restriction portion that covers the outer surface side of the spring portion 7 on the hook portion 8 side. 9b. The base portion 9a is to contact the outer surface of the curved portion of the spring portion 7 to position the portion. The restricting portion 9b prevents the pawl 3 from dropping out of the opening 6a by covering the outer surface of the hook portion 8 side.

  The guide plate 9 is fixed in the groove 6 of the mandrel 2 by inserting a spring pin 11 into the base portion 9a. That is, insertion holes (not shown) are formed in the male screw portion 5 and the base portion 9a of the mandrel 2, and the spring pin 11 is detachably inserted into these insertion holes, whereby the guide plate 9 Is fixedly arranged at a predetermined position in the groove 6.

  Further, as shown in FIGS. 1B and 1C, a substantially rectangular fixing opening 12 is formed on the front end surface of the mandrel 2 so as to communicate with the opening 6b of the groove 6. The fixing opening 12 is formed at a position corresponding to the other end of the spring portion 7 of the pawl 3 (the end opposite to the hook portion 8). Therefore, when the lid 10 is detachably fitted into the fixing opening 12 or is fixed by force fitting, the pawl 3 is regulated by the lid 10 at the other end of the spring portion 7. Is prevented from falling off the opening 6b.

  Under such a configuration, the pawl 3 is detachable in the groove 6. That is, by removing the spring pin 11, the pawl 3 can be easily taken out from the opening 6a by taking out the guide plate 9 from the opening 6a. In addition, when the lid 10 is made detachable, the pawl 3 can be easily taken out from the opening 6b by removing it from the fixing opening 12.

Therefore, by performing such an operation of taking out the pawl 3 and an operation of attaching the pawl 3 opposite to this operation, the above-described replacement of the pawl 3 for attachment to the pawl 3 for removal or vice versa. It can be easily exchanged.
The handle 4 is a rod-like member provided through the rear end of the manddle 2 and is used for rotating the mandrel 2 by rotating the handle 4.

  In manufacturing the tool 1 having such a configuration, in order to process the groove 6 in particular, the conventional mandle is usually only a single groove processing by a horizontal milling cutter. It is also possible to adopt bag-like hole processing by mim processing (metal injection), header processing, or end mill cutting.

  FIGS. 3A to 3D are views showing a modification of the mandrel shown in FIG. 1, and particularly showing the shape of the mandre when bag-like hole machining by end mill cutting is employed. . The mandrel 13 shown in these drawings has a bag-like groove 14 as shown in FIG. 3A, and the pawl 3 shown in FIGS. 2A to 2D is inserted and disposed in the groove 14. It has become so. That is, the pawl 3 is inserted into the groove 14 and is fixed by the guide plate 9 and the cover plate 10. Further, the mandrel 13 is not provided with the rear end handle 4 as shown in FIG. 3C, and is instead formed in a hexagonal column bolt shape.

  In addition, in the tool 1 shown in FIG. 1, the position of the hook portion 8 of the pawl 3 may be closer to the front end side than the predetermined position at the front end portion of the manddle 2 or may be closer to the rear end side during manufacture. In this case, it can be easily corrected as shown in FIG. That is, when the hook portion 8 of the pawl 3 is closer to the tip side than the predetermined position, the inner side of the base portion 9a of the guide plate 9 (the side abutting against the pawl 3) as shown by a two-dot chain line in FIG. ), The hook portion 8 can be easily adjusted to a predetermined position. Further, when the hook portion 8 of the pawl 3 is closer to the rear end side than the predetermined position, the spacer 15 is arranged inside the base portion 9a and is interposed between the base portion 9a and the pawl 3, thereby The part 8 can be easily adjusted so as to be in a predetermined position.

  To attach the tongueless coil thread insert to the attachment hole (tap hole) of another member, for example, a member having low strength made of aluminum or resin, with the tool 1 having such a configuration, first, FIG. The mounting pawl 3 shown in FIG. 3 is inserted and disposed in the groove 6, and in this state, the tongueless coil thread insertion body is attached (screwed) to the male screw portion 5 of the mandrel 2. That is, the mandrel 2 is moved forward (rotated) with respect to the tongueless coil thread insertion body, and the male screw portion 5 on the tip side is inserted into the tongueless coil thread insertion body and screwed together.

At that time, as shown in FIG. 5, the hook body 8a of the hook portion 8 of the pawl 3 is engaged with the notch 51 of the tongueless coil thread insertion body 50, and the handle 4 of the mandle 2 is rotated in this state to By rotating, the tongueless coil thread insertion body 50 can be pressed by the engaging portion 8b of the hook portion 8 and can be rotated.
Then, the rotation of the mandrel 2 is continued, and the tongueless coil thread insert 50 is advanced while rotating, thereby inserting the tongueless coil thread insert 50 into the mounting hole.

If the insertion is continued in this manner, the tongueless coil thread insert 50 reaches the bottom of the mounting hole and cannot proceed any further. Therefore, the operator stops the insertion of the tongueless coil thread insertion body 50 into the mounting hole, and removes the mandle 2 from the tongueless coil thread insertion body 50 by rotating the handle 4 in the reverse direction.
Here, a plurality of tongueless coil thread inserts 50 having different sizes are prepared, and are appropriately selected and used depending on the size of the mounting hole. On the other hand, as for the tongueless coil thread tool 1, a plurality of types having different mandrel diameters are prepared corresponding to the size of the tongueless coil thread insertion body 50.

  In the case where the tongueless coil thread insert 50 is formed with notches 51 at both ends thereof, the notch 51 on the front end side is used to insert into the mounting hole as described above. By using the notch 51, the tongueless coil thread insertion body 50 can be removed from the mounting hole. When the tongueless coil thread insertion body 50 is removed, the pawl 3 is replaced with the one for removal as described above, and the mandle 2 is inserted into the attachment hole in this state and rotated in the direction opposite to that at the time of attachment. . Then, the hook portion 8 of the removing pawl 3 is engaged with the notch 51 on the rear end side of the tongueless coil thread insertion body 50. Therefore, the tongueless coil thread insertion body 50 can be removed from the mounting hole by continuing the rotation after the engagement.

  In the tool 1 having such a configuration, the spring portion 7 that urges the hook portion 8 of the pawl 3 to protrude from the opening portion 6a of the groove 6 is formed integrally with the pawl 3. There is no need to provide a separate urging member as in the prior art, and thus the configuration is simplified. Therefore, the cost can be reduced by reducing the number of parts. Further, since the spring portion 7 is formed integrally with the pawl 3, the conventional pin (pawl pivot shaft) becomes unnecessary, and the processing becomes easy. This also reduces the cost. it can.

  Further, since the pawl 3 is configured to be detachable in the groove 6, the pawl 3 is provided with an attachment and detachment for the tongueless coil thread insertion body 50, so that the tongueless coil thread insertion body 50 can be attached. Both removals can be easily handled. In the case where both the attachment and removal of the tongueless coil thread insertion body 50 are performed as described above, conventionally, it has been necessary to replace the entire mandle for attachment to removal or vice versa. Then, as described above, it is only necessary to replace the pawl 3, so that it is easy to use and advantageous in terms of cost.

Furthermore, when the pawl 3 is worn and cannot be used, it is necessary to remove the pin of the fulcrum and replace it with a new pawl 3, and it is difficult to align at that time. In contrast, the tool 1 of the present embodiment can be easily replaced with a new pawl 3 by removing, for example, the guide plate 9 as described above.
Even if the pawl 3 is displaced during the manufacturing process, the displacement can be easily corrected by scraping the base portion 9a of the guide plate 9 or using the spacer 15. Therefore, it is possible to improve the yield rate of products, thereby reducing the manufacturing cost.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.
For example, in the above-described embodiment, the present invention is applied to the simple type tool 1 mainly composed of the manddle 2, but it can also be applied to, for example, a prewinder type tongueless coil thread tool.

  FIGS. 6A to 6C are views showing another embodiment of the tongueless coil thread tool of the present invention, in which FIG. 6A is a side sectional view of the tongueless coil thread tool, and FIG. Similarly, a plan view, (c) is a rear view, and (d) is a front view. In these drawings, reference numeral 20 denotes a tongueless coil thread tool, and this tongueless coil thread tool (hereinafter referred to as a tool) 20 is of a prewinder type.

  As shown in FIG. 6A, the tool 20 has the mandrel 2 provided with the pawl 3, and the manddle 2 is inserted into a cylindrical housing 21. The housing 21 has a throttle nut 22 held and fixed at the front end, and a cylindrical slide guide 23 held and fixed at the rear end, and the mandole 2 is held in the inner hole so as to be rotatable and movable back and forth. It is. Further, the housing 21 has an opening 21 a formed on a side peripheral surface thereof, and a tongueless coil thread insert is inserted into the housing 21 from the opening 21 a or a tongueless coil thread insert is inserted into the housing 21. It can be taken out.

In addition, a cylindrical positioning stopper 24 is externally inserted into the mandrel 2 at the rear end side of the housing 21, thereby positioning the mandrel 2 and the housing 21 in the axial direction.
The throttle nut 22 has a female screw formed on the inner peripheral surface thereof, and the outer side of the insert is regulated by passing the tongueless coil thread inserted member advanced by the mandrel 2 through the female screw. This is to narrow down this.

The slide guide 23 is held on the rear end side in the housing 21, and holds the mandrel 2 in its inner hole so as to be rotatable and advanceable / retractable.
The handle 4 provided on the rear end side of the mandrel 2 is bent at one end side in this embodiment as shown in FIG. 6B, and a handle knob 25 is provided at the bent portion 4a. Yes.

  In order to attach the tongueless coil thread insert 50 to the attachment hole (tap hole) of the other member with the tool 1 having such a configuration, first, the attachment pawl 3 is placed in the groove 6 in the same manner as in the previous embodiment. Insert and arrange. Then, the mandrel 2 is positioned such that the tip thereof is behind the opening 21a of the housing 21, and in this state, the tongueless coil thread insert 50 is inserted from the opening 21a. Subsequently, the mandrel 2 is rotated while being advanced, and the male screw portion 5 on the distal end side is inserted into the tongueless coil thread insertion body 50 and screwed together.

Further, by continuing the rotation / advance of the mandrel 2 as described above, the tongueless coil thread insert 50 is advanced while being rotated, whereby the tongueless coil thread insert 50 is passed through the throttle nut 22, and the outer peripheral side thereof is passed. Narrow down.
Thereafter, the tip end side of the tongueless coil thread insert 50 that has passed through the throttle nut 22 is inserted into the mounting hole, and the insertion is continued in that state.

Thereafter, the mandrel 2 is removed from the tongueless coil thread insert 50 in the same manner as in the previous embodiment.
Further, when the tongueless coil thread insert 50 is formed with notches 51 at both ends thereof, the tongueless coil thread insert 50 may be removed from the mounting hole in the same manner as in the previous embodiment. it can.

Even in the tool 20 having such a configuration, since the spring portion 7 is formed integrally with the pawl 3, the configuration is simplified, and the cost can be reduced by reducing the number of parts. . In addition, since the conventional pin (pawl pivot shaft) is not required and the processing becomes easy, the cost can also be reduced.
Further, by attaching the tongueless coil thread insert 50 to the mounting hole via the throttle nut 22, the tongueless coil thread insert 50 that has been narrowed down by the nut 22 can be attached to the state of the inlet of the mounting hole, the shape of the inlet, etc. It can be easily inserted into the mounting hole without being affected by the material of the member.

  DESCRIPTION OF SYMBOLS 1 ... Tool for tongueless coil threads, 2 ... Mandle, 3 ... Paul, 5 ... Male screw part, 6 ... Groove, 6a, 6b ... Opening part, 7 ... Spring part, 8 ... Hook part, 9 ... Guide plate, 13 ... Mandle, 14 ... Groove, 15 ... Spacer, 20 ... Tungless coil thread tool, 22 ... Throttle nut, 50 ... Tungless coil thread insert, 51 ... Notch

Claims (3)

A tool for tongueless coil threads for attaching or removing a tongueless coil thread insert in which a notch is formed in an inner thread of a coil end to or from a mounting hole,
A cylindrical mandle in which a male screw part for holding the tongueless coil thread insertion body is formed on the side peripheral part, and a groove that opens to the side peripheral part side is formed along the axial direction thereof,
A pawl having a hook portion at the tip, which is inserted and disposed in the groove of the mandle,
A tool for tongueless coil thread, wherein the pawl is integrally formed with a spring portion that urges the hook portion to protrude from the opening of the groove at the tip of the mandrel. .   2. The tongueless coil thread tool according to claim 1, wherein the pawl is configured to be detachable from the groove.   It has a tubular housing provided with a throttle nut for narrowing the tongueless coil thread insert at the tip, and the mandle can be advanced and retracted into the housing so that the tip can protrude from the housing. The tool for tongueless coil threads according to claim 1 or 2, wherein the tool is inserted and arranged.

Images