JP2017057962A5 - - Google Patents

Description

Combination with screw and driver bit and header punch for screw production

  The present invention relates to a screw provided with a bit fitting groove made of a cross groove on the top surface of a screw head, and in particular, in a bit fitting groove portion provided on a screw head, using a screwdriver bit adapted to this A screw configured to effectively and reliably prevent dangerous burr-like deformed protrusions that often occur due to stress concentration in the bit fitting groove portion when performing a screw tightening operation, and to this screw The present invention relates to a suitable driver bit and a header punch for manufacturing a screw.

  Conventionally, when using a screw S (see FIG. 6 (a)) in which a bit fitting groove G made of a cross groove is provided on the top surface of the screw head, when screwing with a screwdriver bit, the bit of the screw S is used. It has often been confirmed that burr-like deformed protrusions B (see FIG. 6B) are generated at the intersecting edge of the bit fitting groove G due to stress concentration in the fitting groove G.

  However, as described above, when a burr-shaped deformation projection B is generated at the edge of the bit fitting groove, in various household or business products or public facilities to which such a screw is attached, For example, there is a risk of causing scratches on the hands, fingers, etc. due to the burr-shaped deformation projections during handling. Furthermore, when it comes into contact with clothes or the like, a part of the contact is entangled with the burr-shaped deformation projections, which may cause not only damage to clothes but also various harms or dangers to the body.

  The inventor previously formed a vertical end wall portion and a side wall portion each having a predetermined depth in the end edge portion of the bit fitting groove formed of a cross groove formed on the top surface of the screw head. The bottom of the groove extends horizontally and at an angle so as to conform to the shape of the tip of the conventional Phillips screwdriver bit from the lower edge of these vertical end walls toward the center of the screw neck. In addition, a screw that can tightly connect the tip edge of the driver bit to the bit fitting groove of the screw has been successfully developed.

Further, as a driver bit suitable for the use of the screw, a vertical end wall portion of the bit fitting groove of the screw, a right-angled edge portion and a side wall portion that respectively engage with a horizontally extending groove bottom portion and a side wall portion thereof. And a protrusion extending so as to conform to the inner shape of the groove bottom portion and the conical bottom surface extending at an inclination in the bit fitting groove of the screw at the center of the tip end portion of each wing portion. We succeeded in developing a driver bit with a vertically extending wing. Then, to obtain a patent for the combination of a driver bit made of the configuration and screw made of the configuration (see Patent Document 1).

Therefore, in the combination of the screw and the driver bit described in Patent Document 1, a vertical end wall portion having a predetermined depth formed at the end edge portion of the bit fitting groove formed by a cross groove provided on the screw head of the screw; A right-angled edge provided on the driver bit and its side wall with respect to a groove bottom extending horizontally and inclined from the lower edge of the side wall and the vertical end wall toward the center of the screw neck. Formed so as to project and extend at the center of the tip portion of the wing portion so as to conform to the shapes of the groove bottom portion and the conical bottom surface that extend at an angle in the bit fitting groove of the screw. The vertical extension wings are matingly abutted to reduce the taper contact area to the bit mating groove as with a conventional screw and driver bit combination, rather, at the intersection of adjacent bit mating grooves. Do It can tip of Iba bit to enlarge the area of the side wall portions abutting, thereby is capable of preventing the occurrence of come-out phenomenon of the driver bit.

  However, in the combination of the screw and the driver bit described in Patent Document 1, it may not be sufficient to avoid the risk of the burr-shaped deformation protrusions occurring at the crossing edge of the bit fitting groove described above. confirmed.

Japanese Patent No. 3863924

  As described above, in the combination of the screw and the driver bit described in Patent Document 1, the taper contact area with respect to the bit fitting groove as in the conventional combination of the screw and the driver bit is reduced, and the adjacent bit fitting groove is provided. It is possible to enlarge the area of the side wall portion where the tip of the driver bit abuts at the boundary where the driver bit intersects, that is, to enlarge the driving surface of the driver bit, thereby preventing the driver bit from coming out. However, it has been confirmed that the burr-like deformed protrusions B that often occur at the intersecting edges of the bit fitting grooves cannot be reliably eliminated. Therefore, as a result of intensive studies to solve the above-mentioned problem effectively and reliably, the present inventor has developed a screw having the following configuration and a driver bit that can be suitably adapted to the screw and a combination thereof. Successfully developed.

  That is, a bit fitting groove made of a cross groove is formed on the top surface of the screw head, and a cross groove end wall surface that descends approximately vertically from each outer peripheral edge portion of the cross groove is formed. Forming a cross-groove gently-inclined stepped portion extending downwardly from the lower edge portion toward the center of the screw shaft, and intersecting from the lower edge of the cross-groove gently-inclined stepped portion Forming a cross groove bottom surface portion that inclines downward toward the bottom, forming a central portion where the cross groove bottom surface portion intersects in a conical recess, and further opening the entire cross groove on the top surface of the screw head A conventional driver bit as described above is used by forming an inclined opening groove that extends outward along the edge with a required width and is inclined slightly deeper toward the center of the screw shaft. Screw tightening The stress concentration to the bit fitting groove portion, a burr-like deformable projection occurs at the intersection edges of the bit fitting groove, I have found that it is possible to prevent effectively and reliably.

In addition, with respect to the driver bit that can be suitably applied to the screw having the above-described configuration, it engages with the cross groove end wall surface, the cross groove gently inclined step portion, and the side wall surfaces of the bit fitting groove of the screw, respectively. A cruciform groove having a vertical edge portion, a gently inclined edge portion and side wall portions thereof, and extending in a steeply inclined manner in the bit fitting groove of the screw at the center of the tip end portion of each wing portion By forming a driver bit having an extended wing portion that protrudes and extends so as to conform to the shape of the bottom surface portion and the conical concave portion, the screw configured as described above can be smoothly and quickly fitted into the bit fitting groove. The screw bit at the tip edge of the driver bit can be achieved by holding the driving surface against the screw bit fitting groove at the maximum and effectively during the screw tightening operation. While preventing the occurrence of a cam-out phenomenon from the joint groove, it is possible to effectively and reliably ensure that a burr-shaped deformed protrusion is formed at the intersecting edge portion of the bit fitting groove due to stress concentration on the bit fitting groove portion of the screw. I found out that it can be prevented.

Further, regarding the header punch for manufacturing the screw having the above-described configuration, the cross-groove end wall surface, the cross-groove gently sloping step portion in the bit fitting groove of the screw and the side wall surface thereof are provided with corresponding projecting pieces, Provided at the center of the tip of each protrusion piece is a tip protrusion that protrudes so as to conform to the shape of the cross groove bottom and conical recess extending in a steeply inclined manner in the bit fitting groove of the screw, Furthermore, a taper base portion that protrudes in a taper shape so as to correspond to the inclined opening groove portion formed along the entire opening edge portion of the cross groove on the top surface of the screw head is provided on the outer periphery of the base portion of each projection piece. It has been found that by forming the header punch, a screw having the above-described structure excellent in strength can be suitably manufactured.

  Furthermore, in the screw having the above-described configuration, as described above, when a screw tightening operation is performed using a required driver bit that can be adapted to the bit fitting groove of the screw, the screw bit fitting groove portion is entered. In order to effectively and reliably prevent the burr-shaped deformation projections from occurring at the crossing edge of the cross groove of the bit fitting groove due to the stress concentration of the bit fitting groove, the entire opening edge of the cross groove on the top surface of the screw head It is formed of various conventionally known cross grooves and cross holes to form an inclined opening groove that extends outward along the portion with a required width and is inclined slightly deeper toward the center of the screw shaft. It has been found that the present invention can be effectively applied to the screw and the screw to which a minus groove is added. Therefore, it is a matter of course that the driver bit and the header punch for manufacturing the screw applied in this case also have a shape configuration that fits into the bit fitting groove of the screw.

  Therefore, the object of the present invention is to achieve smooth and quick fitting of the screw to the bit fitting groove, and to keep the driving surface of the screw to the bit fitting groove at the maximum and effective during the screw tightening operation. In addition to preventing the occurrence of a cam-out phenomenon from the screw bit fitting groove at the tip edge portion of the driver bit, a burr-like shape is formed at the crossing edge portion of the bit fitting groove due to stress concentration on the bit fitting groove portion of the screw It is an object of the present invention to provide a screw capable of effectively and reliably preventing the occurrence of the deformed protrusion, a driver bit adapted to the screw, and a header punch for screw production.

In order to achieve the above object, a screw according to claim 1 of the present invention is formed with a bit fitting groove comprising a cross groove on the top surface of the screw head, and a cross groove on the top surface of the screw head. A slanted opening groove that extends outward with a required width and is inclined slightly deeper toward the center of the screw shaft is formed .

  The screw according to claim 2 of the present invention forms a cross groove end wall surface that descends approximately perpendicularly from each outer peripheral edge portion of the cross groove, and a central portion of the screw shaft from the lower edge of the cross groove end wall surface The cross is formed with a gently sloping stepped portion that extends downward with a gentle inclination, and is sharply inclined downward toward the center of the crossing from the lower edge of the crosswise sloping step portion. A groove bottom surface portion is formed, and a central portion where the cross groove bottom surface portion intersects is formed in a conical recess.

The screwdriver bit according to claim 3 of the present invention is provided with wing portions that respectively engage with the cross grooves in the bit fitting groove of the screw according to claim 1, and at the center of the tip portion of each wing portion, It is characterized by comprising an extended wing portion that extends so as to conform to the shape of the cross-shaped groove bottom surface portion and the conical recess portion that respectively extend in the bit fitting groove of the screw.

According to a fourth aspect of the present invention, there is provided a screwdriver bit according to a second aspect of the present invention, wherein the screw bit fitting groove according to the second aspect engages with the cross groove end wall surface, the cross groove gently sloping stepped portion and the side wall surfaces thereof. And a cruciform groove bottom surface extending at a sharp inclination in the bit fitting groove of the screw at the center of the tip of each wing. And an extended wing that projects and extends so as to conform to the shape of the conical recess.

The header punch for manufacturing a screw according to claim 5 of the present invention is provided with projection pieces respectively corresponding to the cross grooves in the bit fitting groove of the screw according to claim 1 and at the center of the tip of each projection piece. , A cross-bottom groove bottom portion extending in the bit fitting groove of the screw and a tip protruding portion extending so as to conform to the shape of the conical concave portion are provided, and the screw is further provided on the outer periphery of the base of each protruding piece. A taper base portion protruding in a taper shape is provided so as to correspond to the inclined opening groove portion formed along the entire opening edge portion of the cross groove on the top surface of the head portion.

The header punch for manufacturing a screw according to claim 6 of the present invention corresponds to the cross groove end wall surface, the cross groove gently inclined step portion, and the side wall surfaces thereof in the bit fitting groove of the screw according to claim 2. Protruding pieces are provided at the centers of the tip portions of the protruding pieces so as to fit the shapes of the bottom surface of the cross groove and the conical recess extending in a steeply inclined manner in the bit fitting groove of the screw. Provided with a tip protrusion that exists, and further tapered on the outer periphery of the base of each projection piece so as to correspond to the inclined opening groove formed along the entire opening edge of the cross groove on the top surface of the screw head A protruding taper base is provided.

  According to the screw according to the first and second aspects of the present invention, it extends outward along the entire opening edge of the cross groove on the top surface of the screw head with a required width and points toward the center of the screw shaft. Thus, by forming the inclined opening groove that is inclined slightly deeper, it is possible to smoothly and quickly achieve the fitting of the screw into the bit fitting groove, and at the time of screw tightening operation, the bit fitting groove portion of the screw It is possible to effectively and reliably prevent the burr-shaped deformation projections from being generated at the intersecting edge portion of the bit fitting groove due to the stress concentration on.

  In particular, when the screw according to the present invention is applied as a small screw or a precision screw used in an automated screw tightening mechanism, the screwdriver bit can be quickly and surely connected, and the above-described operations and effects can be achieved. Advantages that can be exhibited effectively are obtained. Furthermore, since the smooth fitting with the driver bit as described above can be performed, it is possible to easily and surely prevent problems that cause damage or peeling to the plating process on the screw head surface.

  According to the screw according to claim 2 of the present invention, in addition to the effects of the above-described invention, the driving surface with respect to the bit fitting groove of the screw is held at the maximum and effectively during the screw tightening operation, and the tip of the driver bit The advantage that the occurrence of the cam-out phenomenon from the bit fitting groove of the screw in the blade portion can be prevented is obtained.

  According to the combination of the driver bit and the screw according to claims 3 and 4 of the present invention, the fitting with the bit fitting groove provided on the top surface of the screw head of the screw having the above-described configuration can be smoothly and quickly performed. This makes it possible to effectively contribute to the prevention of the occurrence of burr-shaped deformed protrusions on the intersecting edge of the bit fitting groove due to the stress concentration on the bit fitting groove portion of the screw during the screw tightening operation. can do.

  According to the header punch for manufacturing a screw according to the fifth and sixth aspects of the present invention, the outer side of the screw head having the above-described configuration has a required width outward along the entire opening edge of the cross groove on the top surface of the screw head. It is possible to easily and appropriately form the inclined opening groove that extends and is inclined slightly deeper toward the center of the screw shaft. In particular, according to the header punch having such a configuration, the taper base portion protruding in a taper shape for forming the inclined opening groove portion increases the strength of the header punch and significantly increases the service life as the header punch. Benefits that can be obtained.

It is principal part side sectional drawing of the screw head which shows one typical Example of the screw which concerns on this invention. It is a schematic plan view of the screw head of the screw shown in FIG. It is a principal part side view of the front-end | tip blade part which shows one typical Example of the driver bit which can be used suitably for the screw which concerns on this invention. FIG. 4 is a cross-sectional side view of an essential part showing a coupling state between the screw shown in FIG. 1 and the driver bit shown in FIG. 3. It is a principal part cross-sectional side view which shows the coupling | bonding state of the screw shown in FIG. 1, and the conventional plus type | mold liver bit. (A) is a schematic perspective view of a screw head of a conventional cross-hole screw, and (b) is a screw showing a state in which a burr-shaped deformation protrusion is generated at the edge of a bit fitting groove in the conventional cross-hole screw. It is a schematic explanatory drawing of a head.

  Next, embodiments of a screw according to the present invention, a driver bit adapted to the screw, and a header punch for manufacturing a screw will be described in detail with reference to the accompanying drawings.

[ Example of screw configuration ]
1 and 2 show a typical embodiment of a screw according to the present invention. FIG. 1 is a schematic side sectional view of a screw head, and FIG. 2 is a schematic plan view of the screw head.

In FIG. 1, reference numeral 10 denotes a screw having a bit fitting groove portion 12 formed of a cross groove on the top surface portion of the screw head portion 11a . The bit fitting groove 12 forms a cross groove end wall surface 13 in which the end edge of the cross groove that opens at the top surface portion of the screw head portion 11 a extends substantially vertically to a required depth. A cross groove gently sloping step portion 14 is formed extending from the edge portion 13a toward the center of the screw shaft 11b downward with a gentle slope, and further from the lower edge portion 14a of the cross groove gently sloping step portion 14 respectively. The cross groove bottom surface portion 15 is formed so as to incline downward toward the intersecting center portion, and the intersecting center portion of the cross groove bottom surface portion 15 is formed in a conical recess 16.

  Note that the side wall surface 17 of the cruciform gently inclined step portion 14 adjacent to the rotation of the screw head portion 11a of the bit fitting groove 12 is fitted to each blade portion of the tip blade portion of the driver bit, which will be described later. In order to perform smoothly, it is set as the structure which has an appropriate draft taper.

The screw 10 according to the present embodiment having the bit fitting groove 12 as described above is expanded to the outside with a required width d along the entire opening edge of the cross groove on the top surface portion of the screw head portion 11a. An inclined opening groove 18 that is inclined slightly deeper toward the center of the shaft 11b (in a range of 45 ° ± 5 ° to 10 ° with respect to a horizontal plane orthogonal to the screw shaft) is formed.

As described above, the screw 10 according to the present embodiment configured as described above has an inclined opening that extends outward with a required width d along the entire opening edge of the cross groove on the top surface of the screw head 11a. When the screw portion is provided by using the driver bit configured to fit the bit fitting groove 12 of the screw 10 or a commercially available plus driver bit by providing the groove portion 18, The operation of fitting the tip blade portion into the bit fitting groove 12 of the screw 10 can be easily and reliably performed.

  However, in this case, in the screw 10 of this embodiment, the inclined opening groove 18 is provided along the entire opening edge of the cross groove, so that the tip edge of the driver bit is inserted into the bit fitting groove 12. And the engagement of the cross groove in the bit fitting groove 12 of the screw 10 and the tip blade portion of the driver bit is positioned below the inclined opening groove portion 18 during the screw tightening operation. For this reason, even if stress concentration occurs in the bit fitting groove portion, it is possible to reliably prevent the generation of burr-shaped deformation protrusions on the top surface portion of the screw head portion 11a.

Therefore, in the present invention, as described above, by providing the inclined opening groove portion 18 that extends outward with the required width d, respectively, along the entire opening edge portion of the cross groove in the top surface portion of the screw head portion 11a , Since it is possible to reliably prevent the occurrence of burr-shaped deformation projections on the top surface portion of the screw head 11a, for example, various known cruciform grooves and screws made of cruciform holes that have been implemented or proposed in the past, and The present invention can also be effectively applied to the screw or the like to which a minus groove is added.

[ Configuration example of driver bit ]
FIG. 3 shows an exemplary embodiment of a driver bit according to the present invention. That is, the driver bit 20 of this embodiment is fitted into the bit fitting groove 12 of the screw 10 and the cross groove end wall surface 13 formed on the end edge of the cross groove of the bit fitting groove 12 and the gentle cross groove inclination. A wing portion 25 having a vertical edge portion 23 and a gently inclined edge portion 24 respectively engaged with the step portion 14 is provided, and at the center of the tip portion of each wing portion 25, the bit fitting groove 12 of the screw 10 is respectively provided. The extended wing portion 26 is formed so as to extend so as to conform to the shapes of the cross groove bottom surface portion 15 and the conical recess portion 16 that extend steeply.

In addition, the side wall part which consists of the both sides | surfaces of each wing | blade part 25 thru | or the extension wing | blade part 26 of the said driver bit 20 is comprised so that the side wall surface 17 formed in the bit fitting groove | channel 12 of the said screw 10 may contact | abut appropriately. Is done. Therefore, the driver bit 20 of the present embodiment configured as described above can be smoothly and properly fitted to the bit fitting groove 12 of the screw 10 of the above-described embodiment.

[ Usage example of screw according to the present invention (1) ]
FIG. 4 shows a use state of the screw 10 by a combination of the screw 10 shown in FIG. 1 and the driver bit 20 shown in FIG. 3 as an example of use of the screw according to the present invention. That is, in FIG. 4, the tip blade portion 22 of the driver bit 20 is smoothly guided by the inclined opening groove portion 18 formed in the bit fitting groove 12 of the screw 10 in each wing portion 25, so that the bit fitting groove can be quickly formed. The wing portion 26 at the tip of the bit has the bottom surface portion 15 of the cruciform groove and the conical recess portion 16 together with the fitting into the cruciform groove end wall surface 13 and the cruciform groove slanting step portion 14 formed at the edge of the cruciform groove 12 It is possible to obtain a proper fitting state.

Therefore, when the screw tightening operation is performed in this state, the engagement between the cross groove in the bit fitting groove 12 of the screw 10 and the tip blade portion 22 of the driver bit 20 is positioned below the inclined opening groove portion 18. For this reason, even if stress concentration occurs in the bit fitting groove portion, it is possible to reliably prevent the generation of burr-shaped deformation protrusions on the top surface portion of the screw head portion 11a. According to the combination of the screw 10 and the driver bit 20 of the present embodiment, as shown in the drawing, the contact area, that is, the driving area between the side wall surface 17 and the side wall portion of the driver bit in the cross groove of the screw 10 is conventionally set. As compared with the case of the above, it can be sufficiently enlarged, and thereby, the cam-out phenomenon of the driver bit at the time of screw tightening can be easily and reliably eliminated.

[ Usage example of screw according to the present invention (2) ]
FIG. 5 shows a use state of the screw 10 by a combination of the screw 10 shown in FIG. 1 and a conventional driver bit 20 ′ as an example of use of the screw according to the present invention. That is, in FIG. 5, the tip blade portion 22 ′ of the driver bit 20 ′ is quickly guided by the inclined opening groove portion 18 formed in the bit fitting groove 12 of the screw 10 in each wing portion 25 ′. A required fitting state can be easily obtained by fitting into the cross groove bottom wall 15 and the conical recess 16 from the cross groove end wall surface 13 formed at the edge of the cross groove of the fitting groove 12.

  Therefore, when the screw tightening operation is performed in this state, the engagement between the cross groove in the bit fitting groove 12 of the screw 10 and the tip blade portion 22 ′ of the driver bit 20 ′ is below the inclined opening groove portion 18. Therefore, even if stress concentration occurs in the bit fitting groove portion, it is possible to reliably prevent the generation of burr-shaped deformation protrusions on the top surface portion of the screw head portion 11a. In this use example as well, the engagement between the cross groove in the bit fitting groove 12 of the screw 10 and the tip blade portion 22 ′ of the driver bit 20 ′ is located below the inclined opening groove portion 18. It was confirmed that the driver bit cam-out phenomenon during the tightening operation can be easily and reliably eliminated.

  As is apparent from the examples of use of the screw according to the present invention described above, for various known cross grooves, screws made of cross holes, screws having a minus groove, etc. that have been implemented or proposed in the past, etc. A screwdriver bit having a tip blade portion suitable for each of the screws provided with inclined opening groove portions 18 extending outwardly with a required width d along the entire opening edge of the cross groove on the top surface portion of the screw head is used. Even in this case, the same excellent effects and effects as described above can be obtained.

[ Configuration example of header punch for screw production ]
From the embodiment described above, a header punch for manufacturing the screw 10 of this embodiment can be obtained. That is, the header punch as the present embodiment corresponds to the cross groove end wall surface 13, the cross groove gently sloping stepped portion 14 and the side wall surface 17 of the bit fitting groove 12 of the screw 10 (see FIG. 1). , Provided with projecting pieces (not shown), and at the center of the tip of each projecting piece, a cross groove bottom surface portion 15 and a conical concave portion extending in a steeply inclined manner in the bit fitting groove 12 of the screw 10. 16 (see FIG. 1) so as to conform to the shape of the protrusion 16 (see FIG. 1), a protruding tip (not shown) is provided, and a cross groove on the top surface of the screw head 11a is formed on the outer periphery of the base of each protrusion. A tapered base portion (not shown) protruding in a tapered shape can be provided so as to correspond to the inclined opening groove portion 18 formed along the entire opening edge portion (see FIG. 1). Therefore, the screw 10 of the present embodiment can be easily manufactured using the header punch configured as described above. According to the header punch having the above-described configuration, the taper base portion that protrudes in a tapered shape for forming the inclined opening groove portion increases the strength of the header punch and can significantly increase the service life as the header punch.

In addition, as described above, the present invention is implemented in the prior art, in which the inclined opening groove portions 18 that extend outward with the required width d are provided along the entire opening edge portion of the cross groove on the top surface portion of the screw head, or In the production of various known cross grooves, screws with cross holes, and screws with a minus groove added, protrusions (not shown) are provided so as to correspond to the cross grooves in the bit fitting groove of the screw, respectively. Is provided at the center of the tip of each projection piece so as to conform to the shape of the bottom surface of the cross groove and the conical recess extending in the bit fitting groove of the screw (see FIG. 1). A projecting and extending tip projecting portion (not shown), and an inclined opening groove formed along the entire opening edge of the cross groove on the top surface of the screw head on the outer periphery of the base of each projection piece. To respond ( 1), and a taper base [not shown] protruding in a tapered shape can be provided.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and the conventional cross grooves, pan-head screws made of cross holes, flat screws, It can be applied over a wide range to various screws such as the above-mentioned screw with a minus groove added, and the inclination of the inclined opening groove may be a conventionally known plane inclination or curved inclination, etc. Many design changes can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 Screw 11a Screw head 11b Screw shaft 12 Bit fitting groove 13 Cross groove end wall surface 13a Lower edge part 14 Cross groove gentle inclination step part 14a Lower edge part 15 Cross groove bottom part 16 Conical recessed part 17 Side wall surface 18 Inclined opening groove part 20 Driver Bit 20 'Conventional Driver Bit 22 Tip Blade 22' Tip Blade 23 Vertical Edge 24 Slightly Inclined Edge 25 Wing 25 'Wing 26 Extension Wing S Screw G Bit fitting groove B Burr-shaped deformation protrusion generated in the bit fitting groove

Claims (6)

A bit fitting groove made of a cross groove is formed on the top surface of the screw head, and the screw shaft extends outwardly with a required width along the entire opening edge of the cross groove on the top surface of the screw head. screw, characterized in that by forming a sloped opening groove inclined downward to deepen somewhat directed in the center of. A cross groove end wall surface that descends approximately perpendicularly from the outer peripheral edge of each of the cross groove grooves is formed, and extends downward from the lower edge of the cross groove wall surface toward the center of the screw shaft with a gentle slope. Forming a cruciform groove gently sloping step portion, forming a cruciform groove bottom surface portion that inclines downward toward the center part intersecting from the lower edge portion of the cruciform groove gently sloping step portion, A screw having a conical recess formed at the center where the two intersect. A wing portion that engages with each of the cross grooves in the bit fitting groove of the screw according to claim 1, and a bottom surface of the cross groove that extends in the bit fitting groove of the screw at the center of the tip of each wing portion. A combination of a screwdriver bit and the screw, characterized in that it comprises an extended wing that protrudes and conforms to the shape of the conical recess. 3. A cross groove end wall surface, a cross groove gently inclined step portion and a side wall surface thereof in the bit fitting groove of the screw according to claim 2, respectively, have a vertical edge, a gently inclined edge portion and a side wall portion that engage with each other. In addition to providing wings, the wings protrude from the center of the tip of each wing so as to conform to the shape of the bottom surface of the cross groove and the conical recess extending in a steeply inclined manner in the bit fitting groove of the screw. A combination of a screwdriver bit and the screw, characterized by comprising an extending wing portion. A protrusion piece corresponding to each of the cross grooves in the bit fitting groove of the screw according to claim 1, and a cross groove bottom surface portion extending in the bit fitting groove of the screw at the center of the tip of each protrusion piece. And a tip protrusion that extends so as to conform to the shape of the conical recess, and further, on the outer periphery of the base of each projection piece, along the entire opening edge of the cross groove on the top surface of the screw head A header punch for manufacturing a screw, characterized by providing a taper base portion that projects in a tapered shape so as to correspond to the formed inclined opening groove portion. A protrusion piece corresponding to each of the cross groove end wall surface, the cross groove gently sloping step portion and the side wall surface thereof in the bit fitting groove of the screw according to claim 2, and at the center of the tip portion of each protrusion piece, In the bit fitting groove of the screw, there are provided a cross-groove bottom surface portion extending in a steeply inclined manner and a tip protrusion portion extending so as to match the shape of the conical recess, and further on the outer periphery of the base portion of each projection piece A header punch for manufacturing a screw, characterized in that a taper base portion protruding in a taper shape is provided so as to correspond to an inclined opening groove portion formed along the entire opening edge portion of the cross groove on the top surface of the screw head.