JP2008275096A - Male thread part, driver and method for removing male thread part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the manufacturing cost of a male thread part and the driver provided with a first driving hole and a second driving hole, and to facilitate working such as pulling out the male thread part which is stripped. <P>SOLUTION: The first driving hole 6 of the male thread part 1 has a cylindrical inner peripheral surface 6a. The radius of the inner peripheral surface 6a is greater than the distance from the center of the second driving hole 7 to the outermost portion. When removing the male thread part 1, the driver 15 is provided with a retaining member 21 and retaining member expanding and contracting means 17, 18, 19 for expanding and contracting the outside diameter of the retainer 21. After the tip of the retaining member 21 is inserted into the first driving hole 6, the circumference of the tip of the retaining member 21 is expanded to press against the inner peripheral surface of the first driving hole 6. The male thread part 1 is pulled out of a member to be fastened by operating the driver 15 so that the retaining member 21 is moved axially rearward while rotating. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to male screw parts such as tapping screws, wood screws, machine screws, and bolts, and more particularly to a male screw part having a drive hole (recess), a driver for driving and rotating such a male screw part, and a method for removing the male screw part.

  The present applicant previously described the first and second drive holes in a male screw component of the type having a drive hole (recess) such as a cross hole, a hexalobular hole, a hexagonal hole, or a square hole in the head in Patent Document 1 previously. Even if either the first or second drive hole is damaged, the other drive hole will not be damaged at the same time, and the fastening or loosening operation can be completed with the undamaged drive hole. We proposed a male threaded part. This male screw component can also be applied to a sinking type (a type in which the head sinks into the fastened material after tightening).

  On the other hand, in the past, when a so-called screw fool state (a state in which the screw slips with respect to the material to be fastened) has been reached, it has been very difficult to pull out the screw. In addition, when the screw part is fastened at a place where it is difficult to access, such as a high place or a narrow place, it is difficult to carry the screw part to the fastening position and perform tightening.

  Therefore, the present applicant has previously proposed a screw component and a driver that can easily perform the above-described operation in Patent Document 2.

Furthermore, the present applicant has previously proposed a driver in Patent Document 3 in which the driver disclosed in Patent Document 2 is improved.
JP 2003-301825 A JP 2004-84916 A JP 2005-177968 A

  In the embodiment of the male screw component disclosed in Patent Document 1 by the present applicant, the first and second drive holes are non-circular. The angle (direction) around the driver's axis must be matched, and the male screw parts cannot be securely held and fixed by the driver, so the fastening location is in an inaccessible place such as a high place or narrow place However, there is a problem that tightening and loosening operations are difficult.

  Further, when a polygonal drive hole is employed as the first drive hole (larger drive hole) as described in the example of Patent Document 1, the direction to the second drive hole (smaller drive hole) Considering the relationship, it is necessary to manufacture a mold that processes the drive hole, which increases the manufacturing cost of the mold and causes unevenness in the part corresponding to the first drive hole in the mold during screw processing. There is a problem that the service life of the mold is shortened because a large force acts (this will be described in more detail later).

  In Patent Document 2, a groove or a recess is provided on the inner wall of a drive hole of a screw component or on the outer wall of a drive shaft such as a hexagon, a square, or a hexalobular (the drive shaft is tightened with a screw component). , Which is a shaft part for loosening, and is generally called the head when it protrudes in the radial direction from the screw part to be driven), and the driver's tip is divided into a plurality of parts, It has a spring-like tip in the direction in close contact with the drive shaft portion, and has a convex portion that fits into the groove portion or concave portion of the screw component and serves as a clue for securing the screw component.

  However, there is a problem that the manufacturing cost of the screw component is increased by providing the groove or the recess. Moreover, since the driver held the screw exclusively by its own springiness, the holding force was limited. That is, if the spring retention of the screw holding part is strengthened in order to obtain a large screw holding force, a large force is required to screw it into the screw hole, and sometimes the screw and the material to be fastened are accidentally damaged. There is a limit to the holding force because there is no large springiness. Therefore, there is a problem that the force for holding and pulling out the screw is limited. In addition, when a screwdriver is screwed into a drive hole manually, there is a limit to the range of expansion and contraction of the spring, so that there is a problem that the size of a screw that can be handled by a single screwdriver is limited.

  Further, the driver of Patent Document 3 has been proposed in order to solve the problems of the driver of Patent Document 2, but has the following problems. A normal driver is designed to rotate by gripping the end side of the handle. However, in the driver of Patent Document 3, the portion corresponding to the handle portion of an ordinary driver is divided into two portions, a “driver grip portion” on the front end side and a “nut with knob” on the rear end side. It is structured like this, after holding the screw at the tip of the driver, the driver as a whole was grasping the `` driver grip '' in the middle and pulling out the screw while rotating in reverse, so use If the user does not use the driver after fully understanding how to use the driver in accordance with the instruction manual or the like, there is a problem that the use is confused and the force is difficult to enter because the part to be operated is intermediate.

  The present invention has been made in view of such conventional circumstances, and one of the objects of the present invention is to provide a first drive in a male screw component having a first drive hole and a second drive hole. It is an object of the present invention to provide a male screw part that can reduce the manufacturing cost of a mold without the need to manufacture a mold for machining the drive hole in consideration of the directional relationship between the hole and the second drive hole.

  Another object of the present invention is to provide a male screw part having a first drive hole and a second drive hole, and when processing the male screw part, the portion corresponding to the first drive hole in the mold is not uniform. It is an object of the present invention to provide a male screw component that can extend the life of a mold without applying a strong force.

  Another object of the present invention is to pull out a male screw part when it is in a screw-up state, or to fasten the male screw part when the fastening place is difficult to access such as a high place or a narrow place. It is an object of the present invention to provide a male screw part and a screwdriver that can be easily moved to a position, tightened or loosened, and can be manufactured at a low cost.

  Another object of the present invention is to provide a driver capable of holding and pulling a male screw part with a large force.

  Another object of the present invention is to provide a driver that can handle a wide range of male screw parts with a single screwdriver.

  Another object of the present invention is to provide a driver that can be operated by gripping the terminal end side of the grip portion in the same manner as a normal driver.

  Another object of the present invention is to provide a method for removing a male screw component that can easily remove a male screw component in a state such as a screw fool.

  Still other objects of the present invention will become apparent from the following description.

  The male screw component according to the present invention includes a first drive hole having a cylindrical inner peripheral surface, and a second drive hole concentric with the first drive hole. The radius of the inner peripheral surface is larger than the distance from the center to the outermost portion in the second drive hole.

  The “distance from the center of the second drive hole to the outermost part” corresponds to half the diagonal distance e of the drive hole specified in JIS in the case of a square hole or a hexagon hole, for example. In the case of a cross hole, it corresponds to half the blade length m defined in JIS.

  In the male screw component of the present invention, when the male screw component is rotated using the first drive hole, the holding member capable of expanding / contracting the outer diameter of the tip portion and the holding member for expanding / reducing the outer diameter of the tip portion of the holding member A driver having member expansion / contraction means is prepared, and after inserting the distal end portion of the holding member into the first drive hole, the outer periphery of the distal end portion of the holding member is enlarged to the inner peripheral surface of the first drive hole. The holding member may be rotated after pressing and fixing the male screw component. In addition, the first drive hole is not only used for driving for tightening and loosening, but is also used in a method for removing a male screw part described later, so that the male screw part in a screw-up state or the like is covered. It can be used very effectively when it is removed from the fastening material.

  Here, the drive hole having a cylindrical inner peripheral surface such as the first drive hole of the present invention fundamentally covers the common sense in the conventional screw technology. That is, all of the conventional drive holes are non-round holes, and a screw of a screwdriver having a corresponding non-circular cross-sectional shape is simply fitted into the drive hole to drive and rotate the screw. Since a screw cannot be driven and rotated even if a bit having a circular cross section corresponding to a round hole-shaped drive hole is simply fitted, in the conventional screw technology, a cylinder like the first drive hole of the present invention is used. A round hole-shaped drive hole having a shape inner peripheral surface was impossible. However, as a result of diligent research, the inventor has provided the driver with a holding member capable of expanding and contracting the outer diameter of the tip as described above, and using the action of a screw pair or the like, It has been found that by enlarging the outer periphery and pressing strongly against the inner peripheral surface of the first drive hole, a sufficient torque can be applied even with a drive hole having a cylindrical inner peripheral surface. It came to an eggplant.

  On the other hand, if the second drive hole is a non-round hole as in the prior art, the male screw component can be driven and rotated by a conventional ordinary screwdriver using the second drive hole. However, in some cases, the second drive hole may be a drive hole having a cylindrical inner peripheral surface in the same manner as the first drive hole (in this case, the second drive hole is also defined as the first drive hole). Similarly, it may be driven and rotated using a screwdriver having a holding member that can expand and contract the outer diameter of the tip portion).

  In this male screw part, when tightening with the second drive hole, the second drive hole is damaged due to an operation mistake such as rotating the driver bit before it is fully fitted in the second drive hole. Even so, the radius of the inner peripheral surface of the first drive hole is larger than the distance from the center to the outermost part of the second drive hole, so the first drive hole is damaged. There is no end. Therefore, even if the second drive hole is damaged, the fastening or loosening operation can be performed with the first drive hole. (If the second drive hole is also round, the second drive hole There is almost no risk of damage due to the tightening operation using the drive hole).

  On the other hand, when tightening with the first drive hole, the first drive hole is round, so there is almost no possibility that the first drive hole will be damaged due to the tightening operation using the drive hole. Even if the first drive hole is damaged due to some other cause, the tightening or loosening operation can be performed on the second drive hole.

  In addition, since the first drive hole has a round shape, there is no need to manufacture a mold for machining the drive hole in consideration of the directional relationship between the first drive hole and the second drive hole. It is possible to reduce the manufacturing cost of the mold, and hence the manufacturing cost of the male screw part. Furthermore, when machining external thread parts, non-uniform force does not act on the part of the mold corresponding to the first drive hole, thus extending the life of the mold and thus reducing the manufacturing cost of external thread parts. Can do.

  In addition, even when the fastening location of male screw parts is difficult to access such as high places or narrow places, the screw parts are fixed and held by the driver in advance using the first drive hole, and then the driver is operated. The fastening operation can be easily performed by carrying the male screw part to the fastening position while being fixedly held at the tip of the driver and performing the fastening operation (if the second drive hole is also round, The second drive hole may be used similarly).

  In addition, when the first drive hole has a non-circular shape such as a hexagonal shape, the outer peripheral shape of the driver holding member must also be a corresponding non-circular shape. It is difficult to obtain the pipe material of the product. For this reason, it is necessary to make a long through hole in a hexagonal bar of the required size, etc., leading to an increase in processing costs and ultimately the price of the driver becomes very expensive. .

  However, in the present invention, the first drive hole is formed into a round hole shape, and the outer peripheral shape of the holding member of the driver that drives the male screw component using the first drive hole can also be formed into a corresponding circular shape. Therefore, since a commercially available round pipe material that is inexpensive and easily available can be used as a material for the holding member of the driver, the driver can be manufactured at a low cost.

  Conventionally, some male screw parts have a circular shallow recess formed around a drive hole such as a square hole or a hexagonal hole. However, it should be noted that such a circular recess is completely different from the first drive hole in the present invention.

  The conventional circular recess is merely an indentation that is incidentally formed when the drive hole is processed by the header in the process of processing the external thread component. To explain this in more detail, the header punch for machining the drive hole is provided with a very low circular base around the convex part (called an arrow) corresponding to the drive hole. When the arrow is pushed into the screw material and the drive hole is machined, the circular base portion strongly presses the peripheral portion of the drive hole of the screw part material, and the material around the drive hole By preventing the flesh from escaping outward, the drive hole is finished accurately. The circular shallow concave portion formed in the male screw part which is a product is merely an indentation by the circular base portion of the header punch, and is very shallow, and the edge portion thereof is not sharp. Therefore, it cannot fulfill the function of the first drive hole in the present invention.

A screwdriver according to the present invention is provided on a handle, a screw shaft that is fixed to the handle, protrudes from the handle, a male screw provided on the screw shaft, and a tip of the screw shaft. A radially enlarged portion, a female screw member screwed into the male screw portion, and a screw shaft inserted through the screw shaft so as to be movable in the axial direction relative to the screw shaft on the tip side of the female screw member. A cylindrical holding member, and a tip crack provided on the leading end side of the holding member,
A tapered portion is provided on the outer periphery of the radially expanded portion or / and the inner periphery of the tip crack portion, and when the handle portion and thus the screw shaft is rotated relative to the female screw member, The screw shaft moves in the axial direction relative to the female screw member to change the distance between the female screw member and the radially enlarged portion, and further, the screw shaft moves relative to the holding member. It moves in the axial direction, whereby the outer diameter of the front end portion of the pre-cracked portion of the holding member is expanded and contracted by changing the contact position between the outer periphery of the radially expanded portion and the inner periphery of the pre-cracked portion. It is what.

  In the driver according to the present invention, the handle portion is held in the predetermined direction with the other hand from the state where the rear end of the holding member and the female screw member are separated from each other so that the female screw member is not rotated by holding it with one hand. (Or, conversely, when the female thread member is rotated in a predetermined direction with the other hand while the handle is gripped with one hand so that it does not rotate), it is relative to the female thread member. Since the handle portion and the screw shaft are moved rearwardly, the tapered portion of the radially expanded portion of the screw shaft first presses the tapered portion of the holding member, and the holding member is relatively female with the screw shaft. It moves to the member side, and the rear end of the holding member comes into contact with the female screw member. Then, since the holding member can no longer move with respect to the female screw member, the radially enlarged portion penetrates deeper into the holding member, and the action of the tapered portion causes the outside of the front end portion of the tip crack portion of the holding member. The diameter goes up.

  Conversely, when the handle portion (or female screw member) is rotated in the reverse direction from the state in which the outer diameter of the tip portion of the front crack portion of the holding member is enlarged as described above, the radially enlarged portion of the screw shaft becomes the female screw member. Therefore, the outer diameter of the tip end portion of the tip crack portion of the holding member is reduced by the action of the tapered portion and the elasticity of the holding member.

  Therefore, after inserting the tip of the tip crack portion into the first drive hole of the male screw part with the outer diameter appropriately reduced, the tip end of the tip crack portion is enlarged by expanding the outer diameter of the tip portion of the tip crack portion. The outer periphery of the part can be strongly pressed against the inner peripheral surface of the first drive hole so that the male screw component is held and fixed to the driver. And since the force which presses the outer periphery of the front-end | tip part of a front crack part to the internal peripheral surface of a 1st drive hole is based on the effect | action of the screw pair with a screw shaft and a female screw member, it should be made into very big force. Therefore, the male screw part can be held and fixed very firmly to the driver.

  For this reason, the male screw component can be driven and rotated in the tightening direction and the loosening direction by rotating the handle and the holding member in a state where the male screw component is held and fixed to the holding member in this way. When the second drive hole is round, the male screw component can be driven and rotated through the second drive hole in the same manner.

  Since the driver of the present invention can be operated by grasping the terminal end side of the handle as in the case of a normal driver, the user can intuitively grasp the usage without giving the user a sense of incongruity. At the same time, it is easy to apply great force.

  Moreover, since the outer diameter of the front-end | tip part of the front crack part of a holding member can be expanded / contracted, a driver can respond to the external thread component of a wide range size with one driver.

In the method for removing a male screw component according to the present invention, the male screw component removing method for removing the male screw component from the fastened material,
A first drive hole having a cylindrical inner peripheral surface and a second drive hole concentric with the first drive hole are provided in the male screw component in advance before fastening, and the first drive hole is provided. A radius of the inner peripheral surface of the second drive hole is larger than the distance from the center to the outermost portion in the second drive hole,
Providing a driver having a holding member capable of expanding and contracting the outer diameter of the distal end portion, and holding member expanding and contracting means for expanding and contracting the outer diameter of the distal end portion of the holding member;
Inserting the tip of the holding member into the first drive hole;
Expanding the outer periphery of the tip of the holding member via the holding member expansion / contraction means of the holding member and pressing the inner periphery of the first drive hole; and
The male screw is operated by operating the driver so that the holding member moves rearward in the axial direction while rotating while the outer periphery of the front end portion of the holding member is pressed against the inner peripheral surface of the first drive hole. And pulling out the part from the material to be fastened.

  In the method for removing a male screw part according to the present invention, the male screw part in a state such as a screw fool can be easily removed.

The male thread component according to the present invention is:
(A) In a male screw part equipped with a first drive hole and a second drive hole, a mold for machining the drive hole in consideration of the directional relationship between the first drive hole and the second drive hole is manufactured. Can reduce the manufacturing cost of the mold,
(B) In a male screw part having a first drive hole and a second drive hole, when the male screw part is processed, a non-uniform force acts on a portion corresponding to the first drive hole in the mold. Without extending the life of the mold,
(C) Pull out the male screw part when the screw is stupid, or if the fastening place is difficult to access such as high place or narrow place, carry the male screw part to the fastening position and tighten it Or you can easily do the work of loosening,
An excellent effect such as can be obtained.

The driver according to the present invention
(B) When pulling out a male screw part when it is in a screw fool state or when the fastening location is difficult to access, such as a high place or narrow place, carry the male screw part to the fastening position and tighten it. Or you can easily do the work of loosening,
(B) A single screwdriver can handle a wide range of male screw parts. (C) It can be operated by gripping the end of the grip, just like a normal driver.
An excellent effect such as can be obtained.

Furthermore, the method for removing the male screw component according to the present invention includes:
(A) The male threaded parts that are in a state such as a screw stupid can be easily removed.
An excellent effect such as can be obtained.

  Hereinafter, the present invention will be described based on embodiments shown in the drawings.

  1 to 5 show a male screw part 1 according to a first embodiment of the present invention. This embodiment fastens an ALC (lightweight cellular concrete) plate of a building member and a metal member such as wood or steel. Self-drilling screw (with a cutting edge on the seating surface of the head, and when tightening, a screw head receiving hole in which the head sinks into the material to be fastened by the cutting edge is drilled by itself This is an example applied to the screw. The male screw part 1 can also be called a wood screw when fastening the ALC plate and wood, and a tapping screw when fastening the ALC plate and a metal member such as steel.

  The male screw component 1 has a shaft portion 2 and a head portion 3, and a male screw portion 4 is provided on the outer periphery on the front end side of the shaft portion 2, while a male screw is provided on the outer periphery on the rear end side of the shaft portion 2. The part 4 is not provided. The head portion 3 is provided at the rear end portion of the shaft portion 2 and protrudes in the radial direction from the shaft portion 2.

  The head 3 has a substantially hexagonal frustum shape in a direction that tapers toward the shaft portion 2, and the top surface 3 a of the head 3 has a regular hexagonal shape and constitutes a seating surface 3 b of the head 3. A ridge line 5 connected to each hexagonal apex of the top surface 3 a is formed on the side of the head 3, and the ridge line 5 is a cutting edge 5. The shaft part 2 side end of the head part 3 has a shape close to a circle having the same diameter as the part of the shaft part 2 where the male screw part 4 is not provided.

  The head 3 has a first drive hole 6 having a cylindrical inner peripheral surface 6a, and a square-drive second drive provided so as to be further depressed from the bottom of the first drive hole 6. A hole 7 is provided. The first drive hole 6, the second drive hole 7 and the shaft portion 2 are concentric with each other. The radius of the inner peripheral surface 6a of the first drive hole 6 is the distance from the center to the outermost part of the second drive hole 7 (in the case of a square hole as in this embodiment, it is defined in JIS. (Corresponding to half the diagonal distance e of the drive hole). In other words, the radius of the inner peripheral surface 6 a of the first drive hole 6 is made larger than the radius of the circle circumscribing the inner peripheral surface 6 a of the second drive hole 7. Between the inner peripheral surface 6a of the first drive hole 6 and the second drive hole 7, an inclined surface portion 8 that falls from the first drive hole 6 side to the second drive hole 7 side (see FIG. 4). Is provided.

  FIG. 6 shows a normal use state of the male screw part 1. The male screw part 1 is screwed into the ALC plate 9 and the member 10 such as wood or steel which are stacked on each other, and the ALC plate 9 and the wood or member 10 are Conclude. When the male screw component 1 is screwed in, the cutting blade 5 provided on the head 3 cuts the ALC plate 9, whereby a screw head accommodation hole 11 is formed in the ALC plate 9, and after tightening When the head 3 is housed in the screw head housing hole 11 formed by itself, the head 3 is submerged in the ALC plate 9 (fastened material).

  When the male screw part 1 is tightened or loosened, the male screw part 1 is usually driven by the second drive hole 7 using a normal screwdriver (not shown) having a bit part having a square cross section. Rotate. This is because it is usually easier to drive and rotate the male screw part 1 through the second drive hole 7 with a normal driver.

  On the other hand, when the male screw component 1 is driven and rotated using the first drive hole 6, the outer diameter of the front end portion of the holding member, which is not a normal driver, and the outer diameter of the front end portion of the holding member is increased. A driver having a holding member expansion / contraction means for expanding and contracting (for example, a driver of this embodiment described later) is prepared, and after the distal end portion of the holding member is inserted into the first drive hole 6, the distal end portion of the holding member is The outer periphery is enlarged and pressed against the inner peripheral surface of the first drive hole so that the male screw part 1 is held and fixed, and then the holding member is driven to rotate. Thus, it is convenient to drive and rotate the male screw part 1 using the first drive hole 6 when the fastening position of the male screw part 1 is a difficult place such as a high place or a narrow place, or the male screw part 1 This is the case when it is driven into a wrong place and is in a screw-up state and needs to be removed, or when the second drive hole 7 is damaged. These will be described in detail later.

  When tightening or loosening with the second drive hole 7, the second drive hole is caused by an operation error such as rotating the driver bit (not shown) before the second drive hole 7 is sufficiently fitted. Even if 7 is damaged, the radius of the inner peripheral surface 6a of the first drive hole 6 is larger than the distance e / 2 from the center to the outermost part of the second drive hole 7, The one drive hole 6 is not damaged. Therefore, even if the second drive hole 7 is damaged, the fastening or loosening operation can be performed on the first drive hole 6.

  On the other hand, when the first driving hole 6 is tightened or loosened, the first driving hole 6 has a round shape, so that the first driving hole 6 is caused by the tightening or loosening operation using the driving hole. There is little risk of damage. Even if the first drive hole 6 is damaged due to some other reason, the second drive hole 7 can be tightened or loosened. The tightening or loosening by the first drive hole 6 is performed through contact between the first drive hole 6 and the outer periphery of the tip of the holding member of the driver. At this time, the second drive hole 7 is more damaged. There is no fear of doing so. In particular, in the present embodiment, the second drive hole 7 is provided so as to be further depressed from the bottom portion 5a of the first drive hole 6. Therefore, even from this point, the second drive hole 7 is provided. However, there is no risk of damage due to the tightening operation using the first drive hole 6.

  In addition, since the first drive hole 6 has a round shape, a mold for machining the drive holes 6 and 7 in consideration of the directional relationship between the first drive hole 6 and the second drive hole 7 ( It is not necessary to manufacture a mold (not shown), and the manufacturing cost of the mold and consequently the manufacturing cost of the male screw part 1 can be reduced. Furthermore, when the male screw part 1 is processed, a non-uniform force does not act on the portion corresponding to the first drive hole 6 in the mold, so that the life of the mold is extended, and consequently the manufacturing cost of the male screw part 1 is reduced. Can be reduced.

  This will be explained in more detail. Usually, metal screws are manufactured by plastic working, and the drive hole portion has a convex portion called an “arrow” corresponding to the shape of the drive hole on the base portion. It is processed using the punch formed. FIG. 15 shows an example of a punch 12 for manufacturing the male screw part 1, and an arrow 14 is integrally formed on the base portion 13 of the punch 12. The arrow 14 includes a first portion 14 a and a second portion 14 b, and the first portion 14 a closer to the base portion 13 has a circular cross section corresponding to the first drive hole 6. On the other hand, the second portion 14 b far from the base portion 13 has a quadrangular cross section corresponding to the shape of the second drive hole 7.

  Since the first portion 14a has a circular cross-sectional shape corresponding to the first drive hole 6, the first portion 14a does not take into account the directional relationship with the second portion 14b corresponding to the second drive hole 7. 14a can be machined, the production cost of the punch 12 (die) is reduced, and the force applied to the first part 14a of the punch 12 (the machining part of the first drive hole 6) during screw production. Is equalized, so that the life of the punch 12 is extended.

  Further, even when the fastening location of the male screw part 1 is a place where it is difficult to access such as a high place or a narrow place, the outer diameter of the front end portion of the holding member is used as described in detail later using the first drive hole 6. After the male screw part 1 is fixed and held by a screwdriver capable of expanding and contracting, the driver is operated to carry the male screw part 1 to the fastening position with the screw fixed and held at the tip of the driver, and tightening work can be performed. It can be done easily.

  7 to 11 show the driver 15 in this embodiment. A rear end portion of the linear screw shaft 17 is embedded in the handle portion 16 of the driver 15, and a main portion of the screw shaft 17 protrudes from the handle portion 16. The screw shaft 17 is fixed concentrically with respect to the handle portion 16, and cannot be rotated with respect to the handle portion 16 or moved in the axial direction (length direction). A male screw portion 18 is provided on the outer periphery of a portion of the screw shaft 17 excluding the tip portion. At the tip of the screw shaft 17, there is provided a radially enlarged portion 19 that protrudes in the radial direction from the outer diameter of the male threaded portion 18. This radially enlarged portion 19 is well illustrated in FIG. In addition, a tapered portion 19a having a diameter that decreases from the front end side to the rear end side (that is, closer to the handle portion 16) of the radial expansion portion 19 is provided.

  A female screw member 20 having a short cylindrical shape or disk shape is screwed into the male screw portion 18. A cylindrical holding member 21 made of a metal such as steel is fitted to the screw shaft 17 so as to be inserted through the screw shaft 17. The holding member 21 is movable in the axial direction relative to the screw shaft 17 on the distal end side of the female screw member 20. In the vicinity of the tip of the holding member 21, four slits 22 are provided in the length direction from the tip of the holding member 21 to the rear at intervals of 90 degrees (see FIG. 12). In the vicinity of the tip portion of 21, a cracked portion 23 is formed. Note that the number of cuts 22 is not limited to four, and may be an appropriate number. On the outer periphery of the tip end portion of the tip crack portion 23 (the outer periphery of the tip end portion of the holding member 21), a convex portion 24 protruding in the radial direction and extending in the circumferential direction and a groove portion 25 recessed in the radial direction and extending in the circumferential direction are adjacent to each other. Is provided. A tapered portion 23 a is provided on the inner periphery of the tip portion of the tip crack portion 23.

  Since the driver 15 is configured as described above, the female screw member 20 is rotated by grasping the female screw member 20 with one hand from the state where the rear end of the holding member 21 and the female screw member 20 are separated as shown in FIGS. When the handle portion 16 is rotated in a predetermined direction with the other hand in a state where it has been prevented (or, conversely, the handle portion 16 is gripped with one hand and prevented from rotating, the female screw is held with the other hand. When the member 20 is rotated in a predetermined direction), the handle portion 16 and the screw shaft 17 move rearward (rightward in the figure) relative to the female screw member 20 as shown in FIG. The tapered portion 19a of the radially enlarged portion 19 of the shaft 17 comes to press the tapered portion 23a of the tip-broken portion 23 of the holding member 21, and the holding member 21 is relatively moved toward the female screw member 20 together with the screw shaft 17. Move and eventually hold member 2 Rear end abuts against the female screw member 20. Then, since the holding member 21 cannot move further with respect to the female screw member 20, the radially enlarged portion 19 penetrates deeper into the holding member 21, and the holding member 21 is caused by the interaction of the tapered portions 19a and 23a. The outer diameter of the tip part of the front crack part 23 is enlarged.

  Conversely, when the handle portion 16 (or the female screw member 20) is rotated in the reverse direction from the state in which the outer diameter of the tip portion of the tip crack portion 23 of the holding member 21 is enlarged as described above, the radial direction of the screw shaft 17 Since the enlarged portion 19 relatively moves in the direction away from the female screw member 20, the outer diameter of the tip portion of the tip crack portion 23 of the holding member 21 is increased by the interaction of the tapered portions 19 a and 23 a and the elasticity of the holding member 21. Go down.

  Therefore, after inserting the tip end portion of the front crack portion 23 into the first drive hole 6 of the male screw part 1 with the outer diameter appropriately reduced, as shown in FIG. The outer diameter is enlarged, and the outer periphery of the front end portion of the front crack portion 23 is strongly pressed against the inner peripheral surface 6a of the first drive hole 6 so that the male screw component 1 is held and fixed to the holding member 21. it can. And the force which the radial direction expansion part 19 presses the outer periphery of the front-end | tip part of the front crack part 23 to the internal peripheral surface 6a of the 1st drive hole 6 is based on the effect | action of the screw pair of the screw shaft 17 and the internal thread member 20. Therefore, since a very large force can be applied, the male screw component 1 can be held and fixed to the driver 15 extremely firmly.

  Therefore, the male screw component 1 can be driven and rotated in the tightening direction and the loosening direction by rotating the handle 16 and then the holding member 21 in a state where the male screw component 1 is held and fixed to the holding member 21 in this way. If the second drive hole 7 is also round, the second drive hole 7 can be driven and rotated by the driver 15 in the same manner.

  Next, a method for removing the male screw part 1 in this embodiment will be described.

  For example, when performing the operation of fastening the ALC plate 9 and the wood 10 with the male screw part 1, as shown in FIG. 13, the screw 10 is often misplaced without finding the wood 10 behind the ALC plate 9. You may end up in a place. In this case, the male screw part 4 of the male screw part 1 floats in the air and enters a so-called screw idiot state. Even if the male screw part 1 is rotated in the reverse direction, the male screw part 1 cannot be removed. The work required a lot of labor.

  However, according to the present embodiment, the male screw part 1 can be removed very easily as follows.

  First, as shown in FIG. 14, the tip portion of the front crack portion 23 is inserted into the first drive hole 6 of the male screw part 1, and then the handle portion 16 (or the female screw member 20) is rotated in a predetermined direction. The outer diameter of the front end portion of the front crack portion 23 is enlarged, and the outer periphery of the front end portion of the front crack portion 23 is strongly pressed against the inner peripheral surface 6a of the first drive hole 6 so that the male screw component 1 is applied to the driver 15. It should be firmly held and fixed.

  Next, by grasping the terminal end side of the handle 16 and moving the handle 16 backward while rotating in the loosening direction, the male screw part 1 can be easily pulled out from the ALC plate 9 and the wood 10 with a large force. (At this time, the screw shaft 17, the holding member 21, and the male screw component 1 rotate and move integrally with the handle portion 16). Therefore, the male screw part 1 that is in the screw foolish state can be removed very easily.

  Next, the effects of the male screw part 1 and the driver 15 which have not been described so far will be further described.

  In order to perform the pulling operation of the male screw part 1 as described above, it is desirable to obtain a large pulling force and a reverse (return) torque. For this purpose, the first drive hole 6 has a diameter and It is desirable to increase the depth so that the contact area with the driver 15 increases. However, in the screw in which the seat surface 3b of the head 3 is inclined so that the head 3 is tapered toward the shaft portion 2 side, like the male screw part 1 or the countersunk screw of the present embodiment, If one drive hole 6 is made large and deep, the distance between the bottom of the first drive hole 6 and the inclined portion of the outer periphery of the head 3 is reduced (the thickness of the portion becomes thinner), and the strength of the head 3 is increased. Will be reduced. Furthermore, the distance between the punch 12 side and the die side is also narrowed, so that the screw material cannot be a cushion, the force applied to each during processing is increased, and the damage to the die is accelerated.

  In order to prevent such an inconvenience, it is preferable that the diameter and depth of the inner peripheral surface 6a of the first drive hole 6 are not excessive. And the inclination which falls in the 2nd drive hole 7 side from the 1st drive hole 6 side between the internal peripheral surface 6a of the 1st drive hole 6 and the 2nd drive hole 7 like a present Example. If the surface portion 8 is provided, the flow of the material can be improved when the male screw part 1 is processed, the processing can be performed satisfactorily, and the life of the punch can be extended.

  Further, if the first drive hole 6 has a non-circular shape such as a hexagonal shape, the outer peripheral shape of the holding member 21 of the driver 15 must also be a corresponding non-circular shape. It is difficult to obtain the ready-made pipe material. For this reason, it is necessary to make a long through hole in a hexagonal bar having a size as required, resulting in an increase in processing costs and eventually the price of the driver 15 becomes very expensive. End up.

  However, in the driver 15, the first drive hole 6 has a round hole shape, and the outer peripheral shape of the holding member 21 of the driver 15 can also be a corresponding circular shape. Since a commercially available round pipe material that is inexpensive and easily available can be used, the driver 15 can be manufactured at low cost. Since the outer periphery of the tip end portion of the cracked portion 23 is pressed against the inner peripheral surface 6a of the first drive hole 6 by the action of the screw pair of the screw shaft 17 of the driver 15 and the female screw member 20, the first drive Even if the hole 6 is round, a sufficient return torque can be applied.

  Further, since the driver 15 can operate by grasping the terminal end side of the handle portion 16 in the same manner as the normal driver 15, the user does not feel uncomfortable, and the user can intuitively understand how to use the driver. It can be grasped and it is easy to apply great force.

  Further, since the driver 15 can expand and contract the outer diameter of the front end portion of the front crack portion 23 of the holding member 21, the single screwdriver 15 can cope with a wide range of male screw parts 1.

  FIG. 16 shows a second embodiment of the male screw part 1 according to the present invention. In the present embodiment, a convex portion 26 is provided at the outer end of the inner peripheral surface 6 a of the first drive hole 6. Other configurations are the same as those of the first embodiment.

  In this embodiment, when the male screw part 1 is pulled out, the male screw part 1 is hooked with the convex part 24 provided on the holding member 21 of the driver 15 on the convex part 26 of the male screw part 1 as shown in FIG. 1, a larger pulling force can be applied.

  However, in the present invention, a sufficiently large pulling force can be generally applied without providing the convex portion 24 on the inner peripheral surface 6a of the male screw part 1 as in the present embodiment.

And in order to provide the convex part 24 used as a clue for securing the external thread part 1 in the 1st drive hole 6 like a present Example, when plastically processing the external thread part 1 with a punch, what is called "rearward" By “extrusion”, it is necessary to push back the material that plastically flows outside the punch, but this push-back work significantly consumes the punch (die). However, if the convex portion 24 is not provided as in the first embodiment, it is not necessary to push back again at the time of rearward extrusion, so that it is possible to reduce the mold allowance and hence the manufacturing cost of the male screw part 1.

In each of the above embodiments, the male screw part 1 is a tapping screw or a wood screw, but the present invention can also be applied to other types of male screw parts such as bolts and machine screws.

  In the present invention, the fastening target is not limited to the combination of the ALC plate and the wood or metal member as shown in the embodiment.

  The shape of the second drive hole in the present invention is not limited to the shape in each of the above embodiments, and a cross hole, a hexalobular hole, a hexagonal hole, a round hole, and other suitable shapes can be selected.

  In each of the above embodiments, the male screw part 1 is a self-drilling screw. However, in the present invention, the male screw part may not be a self-drilling screw or a sinking type.

  Further, in each of the above embodiments, the male screw component 1 has the head portion 3 that protrudes in the radial direction with respect to the shaft portion 2, and the first and second drive holes 6, 7 are provided in the head portion 3. However, the present invention can also be applied to a male screw part having no head (also in this case, the first and second drive holes may be provided at the rear end of the shaft). .

  In Example 1, tapered portions 19a and 23a are provided on both the outer periphery of the radially enlarged portion 19 of the screw shaft 17 of the driver 15 and the inner periphery of the front crack portion 23 of the holding member 21. You may provide a taper-shaped part only in any one of a radial direction expansion part or a front crack part.

  As described above, the male screw component, the screwdriver and the male screw component removing method according to the present invention are useful as a male screw component having a drive hole (recess), a driver for driving and rotating such a male screw component, and a male screw component removing method. .

It is a front view which shows the external thread component in Example 1 of this invention. It is a top view which shows the said external thread component. It is a side view which shows only the head vicinity of the said external thread component. It is sectional drawing in the IV-IV line of FIG. It is sectional drawing in the VV line of FIG. It is sectional drawing which shows the normal use condition of the said external thread component. It is a front view which shows the driver in a present Example. It is sectional drawing which shows the principal part of the said driver. It is sectional drawing which shows the front-end | tip part vicinity of the said driver. It is sectional drawing which shows the state which expanded the outer diameter of the front-end | tip part of the front crack part of the holding member of the said driver. It is sectional drawing which shows the state which fixedly hold | maintained the said external thread component with the said driver. It is a side view which shows the holding member of the said driver alone. It is sectional drawing which shows the example of the state which driven the male screw component in the wrong place. It is sectional drawing which shows the removal method of the external thread component in a present Example. It is sectional drawing which shows the example of the punch which processes the head of the said external thread component. It is sectional drawing which shows the external thread component in Example 2 of this invention with the holding | maintenance part of a driver.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Male thread part 2 Shaft part 3 Head 3b Head seat surface 4 Male thread part of external thread part 5 Cutting edge (ridgeline)
6 1st drive hole 6a Inner peripheral surface of 1st drive hole 7 2nd drive hole 8 Inclined surface part 9 ALC board (fastened material)
10 Wood or steel materials (fastened materials)
DESCRIPTION OF SYMBOLS 11 Screw head accommodation hole 15 Driver 16 Handle part 17 Screw shaft 18 Male screw part of screw shaft 19 Radial direction enlarged part 19a Tapered part of radial direction enlarged part 20 Female screw member 21 Holding member 22 Cutting 23 Pre-crack part 23a Pre-crack part Tapered part of

Claims (8)

  A first drive hole having a cylindrical inner peripheral surface, and a second drive hole concentric with the first drive hole, the radius of the inner peripheral surface of the first drive hole is A male thread component that is larger than the distance from the center to the outermost portion of the second drive hole.   A shaft portion and a head portion provided at a rear end portion of the shaft portion and projecting in a radial direction from the shaft portion; and the first and second drive holes are provided in the head portion. The male screw component according to claim 1, wherein the head portion sinks into the material to be tightened after tightening.   The head is inclined so that the head is tapered toward the shaft side, and the second drive hole is further depressed from the bottom of the first drive hole. An inclined surface portion that falls from the first drive hole side to the second drive hole side is provided between the inner peripheral surface of the first drive hole and the second drive hole. The male screw part according to claim 2.   The head has a cutting edge provided on the seating surface, and when tightening, a screw head accommodation hole is drilled in the material to be fastened by the cutting blade by itself, and the head is the screw head The male screw part according to claim 2 or 3, wherein the male screw part sinks into the accommodation hole. A handle portion, a screw shaft that is fixed to the handle portion, protrudes from the handle portion, a male screw portion provided on the screw shaft, and a radially expanded portion provided on a tip portion of the screw shaft; A female screw member screwed into the male screw portion, and a cylindrical holding member inserted through the screw shaft so as to be movable in the axial direction relative to the screw shaft on the tip side of the female screw member It has a member and a tip crack portion provided on the tip side of the holding member,
A tapered portion is provided on the outer periphery of the radially expanded portion or / and the inner periphery of the tip crack portion, and when the handle portion and thus the screw shaft is rotated relative to the female screw member, The screw shaft moves in the axial direction relative to the female screw member to change the distance between the female screw member and the radially enlarged portion, and further, the screw shaft moves relative to the holding member. It moves in the axial direction, whereby the outer diameter of the front end portion of the pre-cracked portion of the holding member is expanded and contracted by changing the contact position between the outer periphery of the radially expanded portion and the inner periphery of the pre-cracked portion. Driver. In the removal method of the male screw part which removes the male screw part from the material to be fastened,
A first drive hole having a cylindrical inner peripheral surface and a second drive hole concentric with the first drive hole are provided in the male screw component in advance before fastening, and the first drive hole is provided. A radius of the inner peripheral surface of the second drive hole is larger than the distance from the center to the outermost portion in the second drive hole,
Providing a driver having a holding member capable of expanding and contracting the outer diameter of the distal end portion, and holding member expanding and contracting means for expanding and contracting the outer diameter of the distal end portion of the holding member;
Inserting the tip of the holding member into the first drive hole;
Expanding the outer periphery of the front end of the holding member via the holding member expansion / contraction means and pressing the inner periphery of the first drive hole; and
The male screw is operated by operating the driver so that the holding member moves rearward in the axial direction while rotating while the outer periphery of the front end portion of the holding member is pressed against the inner peripheral surface of the first drive hole. A method for removing a male screw part comprising the step of pulling out the part from the material to be fastened. The holding member of the driver has a cylindrical shape and is provided with a tip crack on the tip side,
The holding member expansion / contraction means includes a screw shaft that is inserted in the holding member so as to be relatively movable in the axial direction, a male screw portion provided on the screw shaft, and a radial enlargement portion provided on the screw shaft. A female screw member screwed into the male screw part,
A tapered portion is provided on the inner periphery of the radially enlarged portion and / or the tip crack portion, and when the screw shaft is rotated relative to the female screw member, the taper portion is relative to the holding member. When the screw shaft is moved in the axial direction and the contact position between the inner periphery of the tip cracked portion of the holding member and the outer periphery of the radially enlarged portion is changed, the outer diameter of the tip end portion of the tip cracked portion of the holding member is changed. 7. The method for removing a male screw part according to claim 6, wherein the male screw part is expanded and contracted. The holding member of the driver has a cylindrical shape and is provided with a tip crack on the tip side,
The holding member expansion / contraction means includes a handle portion, a screw shaft that is fixed to the handle portion, protrudes from the handle portion, and is inserted through the holding member so as to be relatively movable in the axial direction, and the screw shaft. A male screw portion provided on the distal end portion of the screw shaft, a radially enlarged portion provided on the tip of the screw shaft, and a female screw member screwed into the male screw portion.
The holding member is movable in the axial direction relative to the screw shaft on the tip side from the female screw member,
A taper-shaped portion is provided on the inner periphery of the radially expanded portion and / or the tip crack portion, and when the handle portion and thus the screw shaft is rotated relative to the female screw member, the female screw The screw shaft moves in the axial direction relative to the member to change the distance between the female screw member and the radially enlarged portion, and the screw shaft moves in the axial direction relative to the holding member. The contact position between the outer periphery of the radially expanded portion and the inner periphery of the tip crack portion changes accordingly, so that the outer diameter of the tip portion of the tip crack portion of the holding member is expanded and contracted. The removal method of the external thread component of Claim 6.

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