JP3225488U - Screws and driver bits and header punches for screw production - Google Patents

Abstract

A screw can be smoothly and promptly fitted into a bit fitting groove, and at the time of screw tightening, stress is concentrated on the bit fitting groove of the screw, so that a crossing edge of the bit fitting groove is formed. Provided are a screw and a header punch for manufacturing the screw, which can effectively and reliably prevent a burr-like deformation projection from being generated in a portion. The screw head is provided with a bit fitting groove formed of a cruciform groove on the top surface of the screw head. An opening groove portion 20 having an L-shaped cross section of a required width and having a required depth is formed. The recesses 22 are formed so that the leading end surfaces 14a are directed to the bottom surfaces of the opening grooves. [Selection diagram] Fig. 1

Description

  The present invention relates to a screw provided with a bit fitting groove formed of a cruciform groove on the top surface of a screw head. A screw configured to effectively and reliably prevent dangerous burr-like deformation projections, which are often generated by stress concentration on the bit fitting groove portion when performing a screw tightening operation, and a screw used for the screw. And a header punch for screw production.

  Conventionally, when a screw S (see FIG. 12 (a)) having a bit fitting groove G formed of a cross groove on the top surface of a screw head is used, when a screw tightening operation is performed by a driver bit, the bit of the screw S It is often confirmed that a burr-like deformation projection B (see FIG. 12B) is generated at the intersection edge of the bit fitting groove G due to stress concentration on the fitting groove G portion.

  However, as described above, when a burr-shaped deformation projection B is generated at the edge of the bit fitting groove, in various home or business products or public facilities to which such screws are attached, For example, at the time of handling, there is a risk that the burr-shaped deformation projections may damage the hands, fingers, and the like. Furthermore, when it comes into contact with clothes or the like, a part thereof may be entangled with the burr-shaped deformation projections, causing not only damage to the clothes or the like but also various harms or dangers to the body.

  Note that the present inventor first formed a vertical end wall portion having a predetermined depth and a side wall portion thereof at a predetermined edge portion in a bit fitting groove formed of a cross groove formed on the top surface of the screw head. A groove bottom extending horizontally and inclined from the lower edge of these vertical end walls toward the center of the screw neck to conform to the shape of the tip of a conventional Phillips screwdriver bit. By forming a gently inclined conical bottom surface at the center bottom of the screw, a screw capable of tightly coupling the tip bit of the driver bit to the bit fitting groove of the screw was successfully developed.

  Further, as a driver bit suitable for use of the screw, a right-angled edge and a side wall thereof which respectively engage with a vertical end wall and a horizontally extending groove bottom and a side wall of the bit fitting groove of the screw. And a wing portion having a tip end of each of the wing portions, and protruding and extending at the center of the tip portion of each of the wing portions so as to conform to the internal shapes of the groove bottom portion and the conical bottom surface which respectively extend and extend in the bit fitting groove of the screw. We succeeded in developing a driver bit with a vertical extension wing. Then, a patent was obtained for a combination of the screw having the above configuration and the driver bit having the above 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 edge portion of the bit fitting groove formed of the cross groove provided in the screw head of the screw is provided. A right-angled edge provided on the driver bit with respect to a groove bottom extending horizontally and inclined from the lower end of the side wall and the lower end of the vertical end wall toward the center of the screw neck and the side wall thereof And formed at the center of the tip of the wing portion and the tip of the wing portion so as to protrude and extend so as to conform to the shapes of the groove bottom portion and the conical bottom surface which are inclined and extend in the bit fitting groove of the screw, respectively. Vertical extension wings fit each other to reduce the taper contact area with the bit fitting groove as in the case of the combination of the conventional screw and driver bit, but rather at the intersecting boundary of the adjacent bit fitting groove. Do 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-like deformation projection being formed at the intersection edge of the bit fitting groove. 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 the bit engagement groove as in the conventional combination of the screw and the driver bit is reduced, and the adjacent bit engagement groove is reduced. Can increase the area of the side wall portion where the tip of the driver bit abuts at the intersection where the driver bit crosses, that is, the driving surface of the driver bit can be enlarged, thereby preventing the occurrence of the cam out phenomenon of the driver bit. However, it has been confirmed that the burr-shaped deformation projection B often generated at the intersection edge of the bit fitting groove cannot be reliably eliminated. Therefore, the present inventors have conducted intensive studies to effectively and surely solve the above-mentioned problems, and as a result, together with the development of a screw having the following configuration, a screwdriver bit that can be suitably adapted to the screw and a combination of the screwdriver bit and the combination thereof have been developed. Successful development.

  That is, in a screw forming a bit fitting groove formed of a cruciform groove on the top surface of the screw head, along the opening edge of the cruciform groove on the top surface of the screw head, outwardly above and above a required width by a required width. An opening groove having an L-shaped cross section having an expanded and required depth is formed, and is directed to the center of the screw head at a boundary surface adjacent to the cross groove in the opening surface of the bit fitting groove in the circumferential direction. By forming an appropriate concave portion on the tip end surface so as to be directed toward the bottom surface of the opening groove portion, when a screw tightening operation is performed using a conventional driver bit, a bit fitting groove portion of the screw is formed. It has been found that it is possible to effectively and reliably prevent a burr-like deformation projection from being generated at the crossing edge of the bit fitting groove due to concentration of stress on the bit fitting groove.

  In addition, as a screw for forming a bit fitting groove formed of a cruciform groove on the top surface of the screw head, not only a screw having a bit fitting groove formed of a cruciform groove that has been conventionally generally marketed, The cross groove formed at the lower edge of the opening groove of the groove has a cross groove end wall surface which descends approximately perpendicularly from the outer peripheral edge of each of the cross grooves, and is formed at the center of the screw shaft from the lower edge of the cross groove end wall surface. A cross-shaped groove that forms a gradually inclined cross-shaped groove that extends downwardly at a gentle inclination, and a cross-shaped groove that is sharply inclined downward toward a central portion that intersects from the lower edge of the cross-shaped groove that is gradually inclined. It was confirmed that the present invention can be effectively applied to a screw in which a bottom portion is formed and a center portion where the cross groove bottom portion intersects is formed in a conical bottom surface, similarly to the spout.

  In a screw provided with a bit fitting groove formed of a cruciform groove on the top surface of the screw head, at one end of the straight groove, one of a pair of linear grooves crossing in a cross shape at the center of the screw head. It has been confirmed that the present invention can be effectively applied to a Plumai screw having an extended groove portion extending outward in the radial direction so that the tip blade portion of the flathead screwdriver bit is fitted and fitted, similarly to the above-described spouting.

  Further, the present invention is not limited to a screw forming a bit fitting groove formed of a cruciform groove on the top surface of the screw head described above.For example, a bit fitting groove formed of an equilateral three-way groove may be formed on the top surface of the screw head. Also for the screw to be provided, while forming the opening groove portion having the L-shaped cross section, the front surface facing the center of the screw head at the boundary surface portion adjacent in the circumferential direction of the equilateral three-way groove, It was confirmed that the same operation and effect as described above can be obtained by forming an appropriate concave portion so as to be directed to the bottom surface of the opening groove.

  Further, in the screw forming a bit fitting groove formed of a cross groove on the top surface of the screw head, in particular, each of the cross grooves formed on the lower edge of the opening groove of the cross groove is perpendicular to the outer peripheral edge of each of the cross grooves. Forming a cross-groove end wall surface that descends in a manner similar to the above, and forming a cross-groove gentle slope step portion that extends from the lower edge of the cross groove end wall surface toward the center of the screw shaft at a gentle inclination, respectively, A cross-groove bottom portion that is steeply inclined downward toward the center portion that intersects from the lower edge portion of the gentle cross-slope step is formed, and the crossing center portion of the cross-groove bottom portion is formed as a conical bottom surface. In this case, a vertical edge, a gentle inclined edge, and a side wall thereof are respectively engaged with a cross groove end wall surface of the bit fitting groove of the screw and a cross groove gentle inclined step and their side wall surfaces. Having a blade portion having At the center of the end, a driver bit is formed having a protruding blade that protrudes so as to conform to the shape of the cross-groove bottom portion and the conical concave portion that extend at a steep slope in the bit fitting groove of the screw. Thereby, the screw having the above configuration can be smoothly and quickly fitted into the bit fitting groove, and at the time of screw tightening work, the driving surface of the screw with respect to the bit fitting groove is maximally and effectively held, and In addition to preventing the occurrence of the cam-out phenomenon of the screw from the bit fitting groove at the tip end of the bit, the stress concentration on the bit fitting groove of the screw causes a burr-like deformation at the intersection edge of the bit fitting groove. It has been found that the occurrence of projections can be effectively and reliably prevented.

  Further, when manufacturing a screw provided with a bit fitting groove formed of a cruciform groove on the top surface of the screw head having the above configuration, a screw provided with a bit fitting groove formed of a cruciform groove on the top surface of the screw head may be used. Preferably, a projection is provided corresponding to the shape of the cross groove in the bit fitting groove, and a cross groove bottom surface and a conical shape extending in the bit fitting groove of the screw are provided at the center of the tip of each projection. A tip projecting portion is provided to extend so as to conform to the internal shape of the bottom surface, and a convex portion corresponding to the concave portion of the screw is provided at a boundary adjacent to the cross-shaped projecting piece in the circumferential direction. A header punch is used in which a projection base having a cross-sectional shape corresponding to an opening groove formed along the opening edge of the cross groove on the top surface of the screw head is provided on the outer periphery of the base of each projection piece. thing More, I have found that it is possible to manufacture a screw consisting of strength superior the configuration simply and properly.

  Similarly, when manufacturing a screw in which a bit fitting groove formed of an equilateral three-way groove is provided on the top surface of the screw head having the above configuration, the screw fitting corresponds to the three-way groove end wall surface in the bit fitting groove and the side wall surfaces thereof. And a tip protruding portion extending so as to form a conical bottom surface with the front end face of each of the protruding pieces directed toward the center thereof. Protrusions respectively corresponding to the recesses of the screw are provided at boundary portions adjacent to each other in the circumferential direction, and further, on the outer periphery of the base of each projection piece, along the opening edge of the three-way groove on the top surface of the screw head. It has been ascertained that the use of a header punch provided with a projecting base having a cross-sectional shape corresponding to the opening groove to be formed makes it possible to easily and appropriately manufacture a screw having the above-described structure with excellent strength.

  Therefore, an object of the present invention is to achieve a smooth and quick fitting of a screw into a bit fitting groove, and to maximally and effectively hold a driving surface of the screw with respect to the bit fitting groove during a screw tightening operation. In addition to preventing the occurrence of a cam-out phenomenon from the screw bit fitting groove at the tip blade portion of the driver bit, the concentration of stress on the bit fitting groove portion of the screw causes a burr-like shape at the intersection edge of the bit fitting groove. It is an object of the present invention to provide a screw, a driver bit, and a header punch for manufacturing a screw, which can effectively and reliably prevent the occurrence of the deformation projection.

To achieve the above object, a screw according to claim 1 of the present invention consists of a screw provided with a bit fitting groove made of Cross grooves on the top surface of the screw head,
Along the opening edge of the cross groove on the top surface of the screw head, an opening groove extending in a required width outward and having a required L-shaped cross section with a required depth is formed above the cross groove,
A concave portion is formed so that a tip end surface facing the center of the screw head at a boundary surface portion adjacent to the cross groove in the circumferential direction of the opening surface of the bit fitting groove is directed to the bottom surface of the opening groove portion. It is characterized by becoming.

The screw according to claim 2 of the present invention is a screw provided with a bit fitting groove formed of an equilateral three-way groove on the top surface of the screw head,
Along the opening edge of the equilateral three-way groove on the top surface of the screw head, an opening groove having a cross section of an L-shape is formed outwardly, expanding at a required width and having a required depth,
Forming a concave portion that is directed toward the center of the screw head at the boundary surface portion that is circumferentially adjacent to the equilateral three-way groove in the opening surface of the bit fitting groove, and is directed toward the bottom surface of the opening groove portion. It is characterized by becoming.

  According to a third aspect of the present invention, there is provided a screw provided with a bit fitting groove formed of a cross-shaped groove or an equilateral three-way groove on a top surface of a screw head. The opening groove formed along the opening edge of the three-way groove is formed along the opening edge corresponding to the driving surface of the cross groove or the equilateral three-way groove.

  The screw according to claim 4 of the present invention is characterized in that the front end surface facing the center of the screw head at the boundary surface portion adjacent to the cross groove or the equilateral three-way groove in the opening of the bit fitting groove is formed in the opening. A recess is formed on the bottom surface of the groove so as to incline downward.

  The screw according to claim 5 of the present invention forms a cross groove end wall surface which descends approximately perpendicularly from an outer peripheral edge of each of the cross grooves formed at a lower edge portion of the opening groove portion, and the cross groove end wall surface. Forming a gently inclined cross-groove step extending downward at a gentle inclination from the lower edge toward the center of the screw shaft, and a central portion intersecting from the lower edge of the gently cross-shaped groove. A cross-shaped groove bottom portion which is steeply inclined downwardly in a downward direction, and a center portion where the cross-shaped groove bottom portion intersects is formed in a conical bottom surface.

  The screw according to claim 6 of the present invention forms a three-way groove end wall surface that descends approximately perpendicularly from an outer peripheral edge of each of the conformal three-way grooves formed at a lower edge of the open groove portion, The groove bottom is formed in a conical bottom directed toward the center thereof.

  According to a seventh aspect of the present invention, there is provided a screw having a bit fitting groove formed of a cruciform groove on a top surface of the screw head. On the other hand, the present invention is characterized in that extension grooves extending radially outward are formed at both ends of the straight groove so that the tip blades of the flathead screwdriver bits are fitted and fitted.

  The driver bit according to claim 8 of the present invention has a cross groove end wall surface and a cross groove gently inclined stepped portion in the bit fitting groove for a screw having a cross fitting groove formed on the top surface of the screw head. And a blade portion having a vertical edge, a gentle slope edge, and their side walls respectively engaging with the side wall surfaces thereof, and a bit fitting of the screw is carried out at the center of the tip of the blade portion. Each of the grooves is provided with a protruding blade portion that protrudes so as to conform to the shape of the cross groove bottom surface and the conical bottom surface that extend steeply.

  In the header punch for screw manufacturing according to the ninth aspect of the present invention, a protrusion corresponding to the cross-shaped groove in the bit-fitting groove is provided for a screw having a bit-fitting groove formed of a cross-shaped groove on the top surface of the screw head. A tip is provided at the center of the tip of each of the projecting pieces, and a tip projecting part is provided at the center of the tip fitting part of the screw so as to protrude and extend so as to conform to the shape of the cross groove bottom surface and the conical bottom surface extending respectively in the bit fitting groove of the screw. A protrusion corresponding to the recess of the screw is provided at a boundary portion adjacent to the protrusion in the circumferential direction of the protrusion protruding in a cross shape, and a top surface of the screw head is provided on an outer periphery of a base of each protrusion. And a projecting base having a cross-sectional shape corresponding to the opening groove formed along the opening edge of the cross groove in (1).

  According to a tenth aspect of the present invention, there is provided a header punch for manufacturing a screw according to the present invention, wherein a cross-shaped groove end wall surface and a cross-shaped groove in the bit fitting groove are loosened. Protrusions corresponding to the inclined steps and their side walls are respectively provided, and at the center of the tip end of each of the protrusions, a cross groove bottom and a conical shape which extend at a steep inclination in the bit fitting groove of the screw, respectively. A tip projecting portion is provided to extend so as to conform to the shape of the bottom surface, and a projection corresponding to the recess of the screw is provided at a boundary adjacent to the cross-shaped projecting piece in the circumferential direction. Further, a protrusion base having a cross-sectional shape corresponding to an opening groove formed along the opening edge of the cross groove on the top surface of the screw head is provided on the outer periphery of the base of each of the projection pieces.

  The header punch for screw manufacturing according to claim 11 of the present invention is the header punch for screw manufacture according to claim 9, wherein the cross groove end wall surface and the cross groove gentle slope step portion in the bit fitting groove and their side wall surfaces are provided. An extension projection that forms an extension groove for fitting the tip blade of the flathead screwdriver bit is provided for one of a pair of projection pieces provided so as to intersect with each other. I do.

  The header punch for screw manufacturing according to claim 12 of the present invention has a three-dimensional groove end wall surface in the bit fitting groove for a screw provided with a bit fitting groove formed of an equilateral three-way groove on the top surface of the screw head. A corresponding projection is provided on the side wall surface of each of the projections, and a tip projection is provided which extends so as to form a conical bottom surface by directing the tip surface of each projection piece to the center thereof, Protrusions corresponding to the recesses of the screw are respectively provided at the boundary portions circumferentially adjacent to the projecting pieces protruding into, and further, on the outer periphery of the base of each of the projecting pieces, the three-way groove on the top surface of the screw head is formed. A protruding base having a cross-sectional shape corresponding to the opening groove formed along the opening edge is provided.

  According to the screw according to the first and second aspects of the present invention, the screw extends along the opening edge of the cross groove or the equilateral three-way groove on the top surface of the screw head and outwardly above the screw with a required width, and An opening groove portion having an L-shaped cross section of a required depth is formed, and a tip surface directed to a center portion of the screw head at a boundary surface portion circumferentially adjacent to the cross groove in the opening surface of the bit fitting groove. By forming the required recesses so as to be directed to the bottom surfaces of the opening grooves, respectively, the fitting of the screw into the bit fitting groove can be achieved smoothly and quickly, and the bit of the screw is It is possible to effectively and reliably prevent a burr-like deformation projection from being generated at the crossing edge of the bit fitting groove due to stress concentration on the fitting groove portion.

  Further, by configuring the screw as described in claims 3 and 4 of the present invention, when the screw is used as a small screw or a precision screw used in an automated screw tightening mechanism, the screwdriver bit can be quickly connected. In addition, there is obtained an advantage that the above-mentioned operation and effect can be effectively exhibited. Further, in the screw tightening work of the screw having the above-described configuration, since a smooth fitting with the driver bit can be performed, the problem that damage or peeling of the plating process on the screw head surface occurs, easily and reliably. Can be prevented.

  Further, according to the screw according to claims 1 to 4 of the present invention, together with the effect of the above-described invention, the area of the screw with respect to the drive surface with respect to the bit fitting groove at the time of screw tightening work is larger than that of the conventional bit fitting groove. Since the opening groove having an L-shaped cross section is formed above the screwdriver, a sufficient driving area can be secured between the opening groove and the corresponding tip blade of the driver bit. This has the advantage of reliably preventing the occurrence of a come-out phenomenon.

  According to the screw according to claims 5 to 7 of the present invention, the screw having the above configuration can be smoothly and promptly fitted with the bit fitting groove provided on the top surface of the screw head, Thereby, at the time of screw tightening work, stress concentration on the bit fitting groove portion of the screw can effectively contribute to preventing generation of burr-like deformation projections at the intersection edge of the bit fitting groove.

  According to the driver bit according to claim 8 of the present invention, when the screw according to claim 5 or 7 is used, fitting with the bit fitting groove provided on the top surface of the screw head is performed. This function can be achieved smoothly and quickly, and at the time of screw tightening work, a function of preventing the occurrence of burr-like deformation projections at the crossing edges of the bit fitting grooves due to stress concentration on the bit fitting grooves of the screws. Can be effectively exerted.

  According to the header punch for manufacturing a screw according to claims 9 to 11 of the present invention, it is necessary to extend outward along the opening edge of the cross groove on the top surface of the screw head of the screw having the above configuration. It is possible to easily and appropriately form an opening groove having an L-shaped cross section with a required width and a desired depth, and at the same time, adjacent to a cross groove in an opening surface of the bit fitting groove in a circumferential direction. The required recess can be simply and appropriately formed so that the front end surface of the boundary portion that faces the center of the screw head faces the bottom surface of the opening groove. Moreover, according to the header punch having such a configuration, it is possible to effectively contribute to the easy and proper manufacture of the screw formed as described above and its mass production from the high strength and the sufficient service life.

  According to the header punch for manufacturing a screw according to the twelfth aspect of the present invention, the screw having the above configuration is required to extend outward along the opening edge of the triangular groove on the top surface of the screw head. It is possible to easily and appropriately form an opening groove having an L-shaped cross section with a required width and a desired depth, and at the same time, adjacent to a cross groove in an opening surface of the bit fitting groove in a circumferential direction. The required recess can be simply and appropriately formed so that the front end surface of the boundary portion that faces the center of the screw head faces the bottom surface of the opening groove. And, similarly to the above, it is possible to effectively contribute to the easy and proper manufacture of the screw composed of the above components and its mass production.

1 is a side sectional view of a main part of a screw head showing a first embodiment of a screw according to the present invention. It is a schematic plan view of the screw head of the screw shown in FIG. FIG. 3 is a sectional view of a main part of the screw head of the screw shown in FIG. 2 taken along the line III-III. It is a schematic plan view which shows the modification of the screw head of the screw shown in FIG. It is a principal part side sectional view of the screw head which shows the 2nd embodiment of the screw concerning this invention. It is a schematic plan view of the screw head of the screw shown in FIG. FIG. 6 is a schematic plan view of a screw head showing a third embodiment of the screw according to the present invention. FIG. 8 is a sectional view of a main part of the screw head of the screw shown in FIG. 7 taken along line VIII-VIII. FIG. 7 is a schematic plan view of a screw head showing a fourth embodiment of the screw according to the present invention. FIG. 10 is a cross-sectional view of the main part of the screw head of the screw shown in FIG. 9 along the line XX. It is a principal part side view which shows one Example of the front-end | tip blade part of the driver bit which can be used suitably for the screw which concerns on 2nd and 3rd embodiment concerning this invention. (A) is a schematic perspective view of a screw head of a conventional cross-recessed screw, and (b) is a screw showing a conventional cross-recessed screw in which a burr-like deformation projection is formed at an edge of a bit fitting groove. It is a schematic explanatory drawing of a head.

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

[ Structural example 1 of screw according to the present invention ]
1 and 2 show a first embodiment of the screw according to the present invention. FIG. 1 is a schematic side sectional view of the screw head, FIG. 2 is a schematic plan view of the screw head, FIG. FIG. 3 is a sectional view taken along line III-III of the screw shown in FIG. 2.

  In FIGS. 1 and 2, reference numeral 10A indicates a screw provided with a bit fitting groove 12 formed of a cross groove on the top surface of a screw head 11a. Therefore, the screw 10A according to the present embodiment extends outwardly along the opening edge of the cross groove on the top surface of the screw head 11a and above the cross groove with a required width w, and has a required depth h. It has a configuration in which an L-shaped opening groove 20 is formed.

  Further, in the opening surface of the bit fitting groove 12 of the screw 10A, the tip surface 14a that is directed to the center of the screw head 11a of the boundary surface portion 14 adjacent in the circumferential direction of the cross-shaped groove is connected to the opening groove portion 20 respectively. The recess 22 is formed so as to be directed to the bottom surface (see FIG. 3). In this case, as shown in FIGS. 1 and 3, the recess 22 can be configured to be inclined downward toward the bottom surface of the opening groove 20. Further, the concave portion 22 may be configured to be cut substantially vertically downward.

  As described above, the screw 10 </ b> A in the present embodiment configured as described above expands outward along the opening edge of the cross groove on the top surface of the screw head 11 a, and expands outward with the required width w, respectively. In addition, by providing the opening groove 20 having the required depth h and having an L-shaped cross section, a driver bit configured to fit the bit fitting groove 12 of the screw 10A, that is, a commercially available Phillips screwdriver bit can be used. When performing the screw tightening operation, the fitting operation of the tip blade portion of the driver bit into the bit fitting groove 12 of the screw 10A can be performed easily and reliably.

  In addition, the recess 22 is formed so that the tip end surface 14a, which becomes the boundary surface portion 14 of the cross groove, is directed to the bottom surface of the opening groove 20 in the opening surface of the bit fitting groove 12 of the screw 10A. In the case of performing the fastening operation, the fitting operation of the tip blade portion of the driver bit into the bit fitting groove 12 of the screw 10A can be performed quickly and easily.

  In the screw 10A of the above-described embodiment, the opening groove 20 is provided along the opening edge of the cross groove, and the recess 22 is formed in the tip end surface 14a of the boundary surface 14 of the cross groove. The tip bit of the driver bit can be easily and quickly fitted into the bit fitting groove 12, and at the time of the screw tightening operation, the cross groove in the bit fitting groove 12 of the screw 10A and the tip bit of the driver bit are Is located below the opening groove portion 20, even if stress concentration occurs in the bit fitting groove portion, the generation of burr-like deformation projections on the top surface of the screw head 11a is ensured. Can be prevented.

  In the screw 10A of the present embodiment having the above configuration, the opening groove 20 provided along the opening edge of the cross groove on the top surface of the screw head 11a is, as shown in FIG. Although it can be provided along the edge, as shown in FIG. 4, it is effective to provide the opening groove portion 20 at least corresponding to a portion to be a driving surface when coupling with a driver bit. Therefore, in each of the embodiments described below, as in the configuration shown in FIG. 4, it goes without saying that the opening grooves 20 can be provided at least corresponding to the portions to be the driving surfaces.

[ Structural example 2 of screw according to the present invention ]
5 and 6 show a second embodiment of the screw according to the present invention. FIG. 5 is a schematic side sectional view of the screw head, and FIG. 6 is a schematic plan view of the screw head.

  FIGS. 5 and 6 show a screw 10B provided with a bit fitting groove 12 made of an improved cross groove on the top surface of the screw head 11a. That is, in the screw 10B of the present embodiment, the edge of the cross groove that opens at the top surface of the screw head 11a forms a cross groove end wall surface 15 that extends substantially vertically to a required depth. The lower edge portion 15a of the cross groove gently inclined step portion 16 is formed so as to extend downward at a gentle inclination from the lower edge portion 15a toward the center of the screw shaft 11b. The cross-groove bottom portion 17 is formed so as to be directed downward toward the intersecting central portion and to be steeply inclined downward, and the intersecting central portion of the cross-groove bottom portion 17 is formed in a conical bottom surface 17a.

  In the bit fitting groove 12 of the screw 10B, the side wall surface 18 of the cross groove gently inclined step portion 16 which is adjacent to the screw head 11a in the rotation direction is formed by the blade piece of the tip blade portion of the driver bit to be described later. In order to smoothly perform the fitting operation with the part, a configuration is adopted in which an appropriate taper is provided.

  In this manner, the screw 10B of the present embodiment having the bit fitting groove 12 is formed along the opening edge of the cross groove on the top surface of the screw head 11a in the same manner as the screw 10A of the above-described embodiment. In the upper part, an opening groove portion 20 having an L-shaped cross section with a required width w and a required depth h is formed outwardly, and in the opening surface of the bit fitting groove 12, the circumferential direction of the cross groove is formed. The recesses 22 are formed so that the tip surfaces 14a of the boundary surface portions 14 that are adjacent to the screw head 11a and that are directed to the center of the screw head 11a are directed to the bottom surface of the opening groove 20.

  Therefore, in the screw 10B of this embodiment configured as described above, as described above, the opening groove 20 is provided along the opening edge of the cross groove, and the distal end surface 14a of the boundary surface portion 14 of the cross groove is provided. By forming the concave portion 22, the tip blade portion of the driver bit can be easily and quickly fitted into the bit fitting groove 12, and at the time of the screw tightening operation, the cross in the bit fitting groove 12 of the screw 10B is formed. Since the engagement between the groove and the tip blade of the driver bit is located below the opening groove 20, even if stress concentration occurs in the bit fitting groove, a burr on the top surface of the screw head 11a is formed. It is possible to reliably prevent the generation of the deformed protrusions.

  For the screw 10B of this embodiment, a screwdriver bit that is compatible with the screw 10A of the above-described embodiment, that is, a commercially available Phillips screwdriver bit can be used. When the screw tightening operation is performed, the fitting operation of the tip blade portion of the driver bit into the bit fitting groove 12 of the screw 10B can be performed easily and reliably.

[ Structural example 3 of screw according to the present invention ]
7 and 8 show a third embodiment of the screw according to the present invention. FIG. 7 is a schematic plan view of the screw head, and FIG. 8 is a schematic cross section of the screw shown in FIG. 7 along the line VIII-VIII. FIG.

  FIGS. 7 and 8 show a screw 10C provided with a bit fitting groove 12 composed of a cross groove that allows the use of a plus screwdriver and a minus screwdriver on the top surface of the screw head 11a. That is, the screw 10C of the present embodiment is different from the screws 10A and 10B of the first and second embodiments described above in that one of a pair of linear grooves that cross in a cross shape at the center of the screw head 11a is Extension grooves 19 extending radially outward are formed at both ends of the straight groove so that the tip blades of the flathead screwdriver bits are fitted and fitted. In FIG. 8, the screw 10B of the second embodiment is shown, and the other configuration is the same as that of the screw 10B of the second embodiment described above. The same reference numerals are given and the description is omitted.

  Therefore, in the screw 10 </ b> C according to the present embodiment configured as described above, as described above, the opening groove 20 is provided along the opening edge of the cross groove, and the tip surface 14 a of the boundary surface portion 14 of the cross groove is formed. By forming the concave portion 22, the tip blade portion of the driver bit can be easily and quickly inserted into the bit fitting groove 12, and at the time of the screw tightening operation, the cross in the bit fitting groove 12 of the screw 10C is formed. Since the engagement between the groove and the tip blade of the driver bit is located below the opening groove 20, even if stress concentration occurs in the bit fitting groove, a burr on the top surface of the screw head 11a is formed. It is possible to reliably prevent the generation of the deformed protrusions.

  Further, for the screw 10C of this embodiment shown in FIG. 8, a screwdriver bit that is compatible with the screw 10A of the above-described embodiment, that is, a commercially available Phillips screwdriver bit can be used, and a screwdriver bit having a configuration described later is used. By using this, when performing the screw tightening operation, the fitting operation of the tip blade of the driver bit into the bit fitting groove 12 of the screw 10C can be performed easily and reliably.

[ Structural example 4 of screw according to the present invention ]
9 and 10 show a fourth embodiment of the screw according to the present invention. FIG. 9 is a schematic plan view of the screw head, and FIG. 10 is a schematic cross-sectional view of the screw shown in FIG. FIG.

  FIGS. 9 and 10 show a screw 10D in which a bit fitting groove 12 'formed of an equilateral three-way groove is provided on the top surface of the screw head 11a. That is, similarly to the screw 10A of the above-described embodiment, the screw 10D of the present embodiment is provided along the opening edge of the three-way groove on the top surface of the screw head 11a, and above and outside thereof. An opening groove 20 having an L-shaped cross section having a required width w and a required depth h is formed, and a boundary surface portion 14 adjacent to the three-way groove in the circumferential direction of the opening surface of the bit fitting groove 12 ′. The recesses 22 are formed such that the tip surfaces 14a facing the center of the screw heads 11a face the bottom surfaces of the opening grooves 20, respectively.

  In the screw 10D of the present embodiment shown in FIG. 10, the three-way groove end wall surface 15 'descending approximately perpendicularly from the outer peripheral edge of each of the conformal three-way grooves formed at the lower edge of the opening groove 20. And the bottom face 17 'of the three-way groove is formed in a conical bottom face directed toward the center thereof.

  In the screw 10D of the present embodiment shown in FIGS. 9 and 10, the recess 22 formed in the distal end surface 14a of the boundary surface 14 which is circumferentially adjacent to the three-way groove and which faces the center of the screw head 11a. Has a configuration in which the bottom surface of the opening groove portion 20 is cut vertically and substantially stepwise. In this case, in the screw 10D of the present embodiment, the recess 22 may be formed so as to be inclined downward toward the bottom surface of the opening groove 20, as shown by a dotted line in FIGS. it can.

  In the screw 10D of this embodiment configured as described above, similarly to the screws 10A, 10B, and 10C of the above-described embodiment, the opening groove 20 is provided along the opening edge of the three-way groove, and the three-way groove is formed. By forming the concave portion 22 in the distal end surface 14a of the boundary surface portion 14, the tip blade portion of the corresponding driver bit can be easily and quickly inserted into the bit fitting groove 12 ', and the screw tightening operation can be performed. Since the engagement between the three-way groove in the bit fitting groove 12 'of the screw 10D and the corresponding cutting edge of the driver bit is located below the opening groove 20, stress concentration on the bit fitting groove is performed. , The occurrence of burr-like deformation projections on the top surface of the screw head 11a can be reliably prevented.

[ Example of the configuration of the driver bit suitable for the screw according to the present invention ]
FIG. 11 shows an embodiment of a screwdriver bit suitable for a screw according to the present invention. That is, the driver bit 30 of this embodiment is adapted to the bit fitting grooves 12 of the screws 10B and 10C of the second and third embodiments, respectively.

  Therefore, the driver bit 30 according to the present embodiment includes a cross groove end wall surface 13 formed at the edge of the cross groove of the bit fitting groove 12 and a cross groove so as to fit into the bit fitting groove 12 of the screws 10B and 10C. A blade portion 35 having a vertical edge portion 33 and a gentle edge portion 34 respectively engaging with the gently inclined step portion 14 is provided, and a bit fitting of the screws 10B and 10C is centered on the tip end of the lenticular portion 35. The protruding blade portion 36 is formed so as to conform to the shape of the cross-groove bottom portion 17 and the conical bottom surface 17a that extend steeply in the mating groove 12, respectively.

  The side wall portion 38 formed by both side surfaces of the blade piece portion 35 or the protruding blade portion 36 of the driver bit 30 appropriately contacts the side wall surface 18 formed in the bit fitting groove 12 of the screws 10B and 10C. It is composed of Therefore, the driver bit 30 of the present embodiment configured as described above can be smoothly and properly fitted to the bit fitting grooves 12 of the screws 10B and 10C of the above-described embodiment.

[ Configuration example 1 of header punch for manufacturing screw according to the present invention ]
From the configuration of the embodiment of the screw 10A according to the present invention described above (see FIGS. 1 to 4), a header punch for manufacturing the screw 10A according to the present invention can be obtained. That is, the header punch for manufacturing the screw 10A is provided with projections (not shown) corresponding to the cross-shaped grooves in the bit fitting groove 12 formed of a cross-shaped groove on the top surface of the screw head 11a. At the center of the tip of the projecting piece, a tip protruding portion (shown in the drawing) that protrudes and extends so as to conform to the shape of the cross groove bottom surface and the conical bottom surface extending in the bit fitting groove 12 of the screw 10A, respectively (see FIG. 1). Are omitted), and a protrusion (not shown) corresponding to the concave portion 22 (see FIG. 1) of the screw 10A is provided at a boundary portion adjacent to the cross-shaped projecting piece in the circumferential direction. Further, on the outer periphery of the base of each of the projecting pieces, a projecting base (see FIG. 1) having a cross-sectional shape corresponding to an opening groove 20 (see FIG. 1) formed along the opening edge of the cross groove on the top surface of the screw head 11a. Omitted It may be configured to provided.

  Therefore, the screw 10A can be easily manufactured by using the header punch configured as described above. Further, according to the header punch having the above-described configuration, the projecting base projecting in an L-shaped cross section for forming the opening groove portion 20 increases the strength of the header punch and significantly increases the service life of the header punch. it can.

[ Configuration example 2 of header punch for manufacturing screw according to the present invention ]
From the configuration of the embodiment of the screw 10B according to the present invention described above (see FIGS. 5 and 6), a header punch for manufacturing the screw 10B according to the present invention can be obtained. That is, the header punch for manufacturing the screw 10B includes a cross groove end wall surface 15 and a cross groove mildly inclined step portion 16 in the bit fitting groove 12 formed of a cross groove on the top surface of the screw head 11a, and their side wall surfaces ( 5 (see FIG. 5), and a cross-groove bottom surface that is steeply extended in the bit fitting groove 12 of the screw 10B at the center of the distal end of each of the protruding pieces. A tip projecting portion (not shown) is provided so as to protrude and extend so as to conform to the shape of the portion 17 and the conical bottom surface 17a (see FIG. 5), and is adjacent to the cross-shaped projecting piece in the circumferential direction. A convex portion (not shown) corresponding to the concave portion 22 (see FIG. 5) of the screw 10B is provided at the boundary, and a cross groove on the top surface of the screw head 11a is provided on the outer periphery of the base of each of the projecting pieces. Open (The not shown) protruding base of the corresponding cross-sectional shape to the opening groove 20 (see FIG. 5) formed along the edges may be configured to provided.

  Therefore, the screw 10B can be easily manufactured using the header punch configured as described above. Further, according to the header punch having the above-described configuration, the projecting base projecting in an L-shaped cross section for forming the opening groove portion 20 increases the strength of the header punch and significantly increases the service life of the header punch. it can.

[ Configuration example 3 of header punch for manufacturing screw according to the present invention ]
Based on the configuration of the embodiment of the screw 10C according to the present invention described above (see FIGS. 7 and 8), a header punch for manufacturing the screw 10C according to the present invention can be obtained. That is, the header punch for manufacturing the screw 10C is the same as the header punch for manufacturing the screw 10B according to the present invention, except that the cross groove end wall surface 13 in the bit fitting groove 12 and the cross groove gently inclined step. The tip blade of the flathead screwdriver bit fits into one of a pair of protrusions (not shown) provided so as to intersect with each other in correspondence with the portions 16 and their side walls (see FIG. 8). An extension protrusion (not shown) for forming an extension groove 19 (see FIG. 8) for performing the operation can be provided.

  Therefore, the screw 10C can be easily manufactured by using the header punch configured as described above. Further, according to the header punch having the above-described configuration, the projecting base projecting in an L-shaped cross section for forming the opening groove portion 20 increases the strength of the header punch and significantly increases the service life of the header punch. it can.

[ Configuration example 4 of header punch for manufacturing screw according to the present invention ]
From the configuration of the embodiment of the screw 10D according to the present invention described above (see FIGS. 9 and 10), a header punch for manufacturing the screw 10D according to the present invention can be obtained. That is, the header punch for manufacturing the screw 10D is provided on the three-sided groove end wall surface 15 'of the bit fitting groove 12' formed of an equilateral three-sided groove on the top surface of the screw head and the side wall surface thereof (see FIG. 10). Corresponding protrusions (not shown) are provided, and the protrusions extend so as to form a conical bottom surface 15a '(see FIG. 10) with the front end surface of each protrusion being directed toward the center thereof. (Not shown), and a protrusion (not shown) corresponding to the recess 22 (see FIG. 22) of the screw is provided at a boundary portion adjacent to the projection piece projecting in the three conformal directions in the circumferential direction. Projection bases each having a cross-sectional shape corresponding to an opening groove 20 (see FIG. 10) formed along the opening edge of the three-way groove on the top surface of the screw head 11a on the outer periphery of the base of each projection piece. (Not shown) And it can be configured.

  Therefore, the screw 10D can be easily manufactured using the header punch configured as described above. Further, according to the header punch having the above-described configuration, the projecting base projecting in an L-shaped cross section for forming the opening groove portion 20 increases the strength of the header punch and significantly increases the service life of the header punch. it can.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and is a conventional cross groove, a pan screw having a cross hole, and a countersunk screw which are generally used. , And various screws such as a conformal three-way groove or a conformal multidirectional groove can be applied over a wide range, and an opening provided on the top surface of the screw head. The size and shape of the groove and the size and shape of the recess provided at the tip of the boundary between the bit fitting grooves can be variously selected or modified, and other ranges that do not deviate from the spirit of the present invention are provided. Many design changes can be made within.

10A, 10B, 10C, 10D Screw 11a Screw head 11b Screw shaft 12 Bit fitting groove 12 'Bit fitting groove 14 Boundary surface 14a Tip surface 15 Cross groove end wall surface 15a Lower edge 15' Three-way groove end wall surface 16 Cross groove gentle inclination Step 16 a Lower edge 17 Cross groove bottom 17 a Conical bottom 17 ′ Three-way groove bottom 18 Side wall 19 Extension groove 20 Open groove 22 Recess 30 Driver bit 32 Tip blade 33 Vertical edge 34 Slowly inclined edge 35 Blade piece portion 36 Protruding blade portion 38 Side wall portion S Screw G having bit fitting groove formed of conventional cross-shaped groove Bit fitting groove B Burr-shaped deformation projection generated in bit fitting groove portion

Claims (12)

It consists of a screw that provides a bit fitting groove consisting of a cross groove on the top surface of the screw head,
Along the opening edge of the cross groove on the top surface of the screw head, an opening groove extending in a required width outward and having a required L-shaped cross section with a required depth is formed above the cross groove,
A concave portion is formed so that a tip end surface facing the center of the screw head at a boundary surface portion adjacent to the cross groove in the circumferential direction of the opening surface of the bit fitting groove is directed to the bottom surface of the opening groove portion. A screw characterized by becoming. It consists of a screw that provides a bit fitting groove consisting of an equilateral three-way groove on the top surface of the screw head,
Along the opening edge of the equilateral three-way groove on the top surface of the screw head, an opening groove having a cross section of an L-shape is formed outwardly, expanding at a required width and having a required depth,
Forming a concave portion that is directed toward the center of the screw head at the boundary surface portion that is circumferentially adjacent to the equilateral three-way groove in the opening surface of the bit fitting groove, and is directed toward the bottom surface of the opening groove portion. A screw characterized by becoming.   In a screw provided with a bit fitting groove formed of a cross groove or a triangular triangular groove on the top surface of the screw head, an opening formed along the opening edge of the cross groove or the triangular triangular groove on the top surface of the screw head. 3. The screw according to claim 1, wherein the groove is formed along an opening edge corresponding to a driving surface of the cross-shaped groove or the three-way groove.   A concave portion that is inclined downward toward the center of the screw head at the boundary surface portion adjacent to the cross groove or the equilateral three-way groove in the opening of the bit fitting groove is directed downward toward the bottom surface of the opening groove. The screw according to any one of claims 1 to 3, wherein the screw is formed.   The cross groove formed at the lower edge of the opening groove has a cross groove end wall surface which descends approximately perpendicularly from the outer peripheral edge of each cross groove, and is directed toward the center of the screw shaft from the lower edge of the cross groove end wall surface. And a cross-groove bottom surface which forms a gentle cross-slope step extending downwardly at a gentle slope, and which steeply inclines downward toward a central portion which intersects from a lower edge of the cross-slot gentle slope step portion. The screw according to any one of claims 1, 3, and 4, wherein a portion is formed, and a central portion where the cross groove bottom portion intersects is formed in a conical bottom surface.   A three-sided groove end wall surface which descends approximately perpendicularly from the outer peripheral edge of each of the equilateral three-sided grooves formed at the lower edge of the opening groove is formed in a conical shape whose bottom is directed toward the center thereof. The screw according to any one of claims 2, 3, and 4, wherein the screw is formed on a bottom surface.   In a screw provided with a bit fitting groove formed of a cross groove on the top surface of a screw head, a flathead screwdriver is provided at both ends of the linear groove with respect to one of a pair of linear grooves intersecting in a cross shape at the center of the screw head. The plastic screw according to any one of claims 1, 3, 4, and 5, wherein an extension groove portion extending radially outward is formed so that a tip blade portion of the bit fits and fits.   For a screw provided with a bit fitting groove consisting of a cross groove on the top surface of the screw head, vertical edges engaging with the cross groove end wall surface, the cross groove gentle slope step and the side wall surface of the bit fitting groove, respectively. And a blade portion having a gently inclined edge portion and a side wall portion thereof, and a cross groove bottom surface extending at a sharp inclination in a bit fitting groove of the screw at the center of the tip of the blade portion. The screwdriver bit according to claim 5 or 7, further comprising a protruding blade portion protruding so as to conform to the shape of the conical bottom surface.   For a screw in which a bit fitting groove made of a cross groove is provided on the top surface of the screw head, a projection piece corresponding to the cross groove in the bit fitting groove is provided, and the screw is provided at the center of the tip of each projection piece. And a tip protruding portion that protrudes and extends so as to conform to the shape of the cross groove bottom surface and the conical bottom surface that respectively extend in the bit fitting groove, and is adjacent in the circumferential direction to the cross-shaped protruding piece. A convex portion corresponding to the concave portion of the screw is provided at the boundary portion, and further, on an outer peripheral portion of a base of each of the projecting pieces, an opening groove portion formed along an opening edge portion of a cross groove on a top surface of the screw head. 5. A header punch for producing a screw according to claim 1, further comprising a projecting base having a corresponding cross-sectional shape.   For a screw in which a bit fitting groove formed of a cross groove is provided on the top surface of the screw head, projecting pieces respectively corresponding to the cross groove end wall surface and the cross groove mildly inclined stepped portion and the side wall surface of the bit fitting groove are formed. At the center of the tip of each of the projecting pieces, there is provided a tip projecting portion projecting and extending in the bit fitting groove of the screw so as to conform to the shape of the cross groove bottom surface and the conical bottom surface extending steeply. At the same time, a protrusion corresponding to the concave portion of the screw is provided at a boundary portion adjacent in the circumferential direction of the projecting piece projecting in a cross shape, and further, a base portion of each of the projecting pieces has The header punch according to claim 5, wherein a projecting base having a cross-sectional shape corresponding to the opening groove formed along the opening edge of the cross groove on the top surface is provided.   11. The header punch according to claim 10, wherein a pair of cross-shaped end surfaces of the bit fitting groove, the cross-shaped groove gently inclined steps, and the side wall surfaces thereof are provided so as to intersect with each other. The screw production for manufacturing a plastic screw according to claim 7, wherein an extension projection is formed on one of the projection pieces to form an extension groove for fitting the tip blade of the flathead screwdriver bit. Header punch.   For a screw provided with a bit fitting groove formed of an equilateral three-way groove on the top surface of the screw head, a projection piece corresponding to the three-way groove end wall surface and the side wall face of the bit fitting groove is provided. A tip projecting portion is provided so as to project so as to form a conical bottom surface with the tip end surface directed toward the center thereof, and the projection piece projecting in the isometric three directions is provided at a boundary adjacent to the circumferential direction of the projecting piece. A convex portion corresponding to the concave portion of the screw is provided, and further, a cross-sectional shape corresponding to an opening groove portion formed along the opening edge of the three-way groove on the top surface of the screw head on the outer periphery of the base of each projection piece. 7. A header punch for producing a screw according to claim 2, wherein a projecting base is provided.

Images