JP3863924B2 - Screw and driver bit combination - Google Patents

Description

[0001]
[Industrial application fields]
The present invention, the screw and is intended according to the driver bit apply thereto, in particular tight line the fitting of a cross groove formed on the head of the screw and driver bit to accommodate this Utotomoni, the driver bit Out The present invention relates to a combination of a screw and a driver bit that can effectively prevent occurrence of a phenomenon and can always quickly and reliably achieve screw installation and removal by proper torque transmission.
[0002]
[Prior art]
The combination of the conventional general screw and driver bit, there has been known which is constructed as shown in FIGS. 9 to 12. 9 and 10 show a conventional screw having a cross groove, FIG. 11 shows a driver bit for the cross groove screw, and FIG. 12 shows a fitting state of the screw and the driver bit. is there.
[0003]
However, the conventional screw 10 shown in FIG. 9 is provided with a cross groove 12 in the screw head 10a. Each of the cross grooves 12 extends from the end edge toward the center of the screw neck 10b, and a certain inclined groove 12a is formed to extend. At the bottom, a substantially conical bottom surface 14 having a gentle inclination is formed. Is formed. Reference numeral 13 denotes a tapered side wall formed between the adjacent cross grooves 12. That is, the tapered side wall portion 13 comes into contact with and engages with a wing portion of a driver bit which will be described later.
[0004]
On the other hand, the conventional driver bit 20 shown in FIG. 11 includes wings 22 that fit into the cross groove 12 of the screw 10 and is directed from the end edge of the cross groove 12 to the center of the screw neck 10b. Thus, extended wing portions 22a are formed so as to be adapted to the shape of the inclined groove portion 12a formed to extend. Reference numeral 23 denotes tapered side wall portions formed on both side surfaces of each wing portion 22 or extension wing portion 22a. That is, the tapered side wall portion 23 comes into contact with and engages with the tapered side wall portion 13 formed in the cross groove 12 of the screw 10 described above.
[0005]
According to the conventional combination of the screw and the driver bit configured as described above, as shown in FIG. 12, when the screw 10 and the driver bit 20 are fitted, as described above, each wing portion of the driver bit 20 is provided. 22 and the extended wings 22a are fitted into the inclined grooves 12a of the cross grooves 12, respectively, and the side walls 23 of the wings 22 and the extension wings 22a are in contact with the tapered side walls 13 of the cross grooves 12 of the screw 10. To do. Therefore , a predetermined torque can be transmitted to the screw 10 by rotating the driver bit 20. That is, it is possible to attach or remove a screw from a required object to be attached to the screw.
[0006]
[Problems to be solved by the invention]
However, according to the combination of the conventional screw 10 and the driver bit 20 having the above-described configuration, as shown in FIG. 12, the cross groove 12 of the screw head portion 10a has a central portion of the screw neck portion 10b from its end edge portion. On the other hand, the driver bit 20 corresponding thereto has a ridge line portion of the extended wing portion 22a adapted to the shape of the inclined groove portion 12a and fitted into the cross groove 12. The combined Ru. And the ridgeline part of this extension wing | blade part 22a is gradually formed widely toward the back from the front-end | tip. Further, since the tapered side wall portion 23 formed on each wing portion 22 of the driver bit 20 also abuts and engages with the tapered side wall portion 13 formed on the cross groove 12 of the screw 10, the driver bit 20 is moved in a predetermined direction. , The contact state between the driver bit 20 and the cross groove 12 can be said to be a taper contact over the entire surface. Therefore, the tip of the driver bit 20 is placed on the inclined surface of the inclined groove portion 12 a of the cross groove 12. A so-called come-out phenomenon occurs when trying to jump outward along the line (indicated by an arrow in FIG. 12).
[0007]
In particular, as shown in FIG. 10, the shape of the cross groove of the conventional screw facilitates the fitting of the tip of the driver bit 20, so that the width of the cross groove 12 is the width of the extension wing 22a of the driver bit 20, respectively. It is relatively larger than the width of the ridge portion, whereas the area of the tapered sidewall portions 13 formed in the boundary portion between the adjacent cross groove 12, 12 is relatively small rather formed. For this reason, when the driver bit 20 is rotated, a great stress is applied to the tapered side wall portion 13 and when the screw tightening resistance is large, the tapered side wall portion as shown by the shaded portion 15 in FIG. The part 13 is gradually damaged. Therefore, when the damaged portion (shaded portion 15) is enlarged, the cam bit phenomenon of the driver bit 20 frequently occurs, and finally the screw tightening operation becomes impossible.
[0008]
From this point of view, in order to prevent the driver bit 20 from coming out, it is necessary to apply a thrust force that strongly presses the driver bit 20 against the inclined groove portion 12a of the screw. However, there is no problem when the object to which the screw is attached is a rigid body such as a metal, but there is a drawback that these objects are damaged or broken in the case of wood or synthetic resin.
[0009]
Further, in order to prevent the occurrence of the aforementioned cam-out phenomenon , by applying a thrust to the driver bit 20, wear of the bit tip portion, that is, the wing portion 22 and the extension wing portion 22a becomes remarkable. Not only does this promote the come-out phenomenon, but also the thread breakage increases.
[0010]
Furthermore, it is possible to prevent the occurrence of the cam-out phenomenon by applying an excessive thrust to the driver bit 20, but on the other hand, an accurate torque cannot be transmitted to the screw. In particular, when an electric screwdriver is used, the magnitude of the thrust applied to the driver bit 20 differs depending on the operator, and as a result, there is a difficulty in causing variation in the screw tightening torque.
[0011]
Furthermore, in the case of a tapping screw, when tightening a screw against an object such as a synthetic resin, friction due to thrust is added to the rotational friction of the screw, and high heat is generated in the object. There are drawbacks such as lowering the hardness of the screw mounting portion of the object and generating looseness of the screw or damaging the object.
[0012]
On the other hand, when manually tightening the screw, the operation of rotating the driver bit 20 while pressing the screwdriver bit 20 sufficiently against the screw has a difficulty in giving a great deal of labor and fatigue to the operator.
[0013]
Further, according to the combination of a conventional screw 10 and driver bit 20 as described above, If you want some hand tools that use the electric power tool performs a mounting screws, upon fitting of the bit tip relative to the screw groove, the screw shaft It is difficult to rotate the screw while maintaining a state where the screw bit shaft and the driver bit shaft are fitted coaxially. Therefore, when the screw shaft and the driver bit shaft are inclined, the cam-out phenomenon may occur. Not only does it occur frequently , breakage of the thread groove also occurs frequently.
[0014]
Furthermore, when removing the screw, the same cam-out phenomenon and damage to the screw groove are likely to occur. However, in this case, it is impossible to remove the screw, and a part of the screw installation target must be destroyed. There will be a situation where the In particular, when dust clogging or the like occurs in the thread groove, there is a disadvantage that the occurrence of the above situation becomes significant.
[0015]
Therefore, the object of the present invention is to effectively prevent the occurrence of a driver bit cam-out phenomenon by improving the configuration of the groove portion in the cross groove of the screw in the combination of the screw and the driver bit, and breakage of the screw as in the conventional case To provide a combination of a screw and a driver bit that can always achieve proper and quick screw tightening work and significantly improve work efficiency even if the cross groove portion of the screw is damaged. is there.
[0016]
[Means for Solving the Problems]
To achieve the above object, the combination of the screw and driver bit according to the present invention, the slope of a certain directed to distal ends of the blade portion at the center thereof provided with a blade portion which fits into the cross groove of the screw, respectively Vertical end wall portions with a predetermined depth on the edge of the bit fitting groove consisting of a cross groove on the screw head so as to be compatible with a conventional driver bit formed as an extended wing portion extending at And the side wall portion thereof, and are oriented horizontally and inclined so as to be adapted to the shape of the tip portion of the conventional driver bit from the lower edge portion of these vertical end wall portions toward the center portion of the screw neck portion. And a screw that forms a groove bottom that extends and a conical bottom surface that is gently inclined at the center bottom;
A wing having a vertical edge wall portion of the bit fitting groove of the screw and a horizontally extending groove bottom portion and a side wall portion thereof and a right-angled edge portion and a side wall portion thereof; A driver bit provided with a vertically extending wing portion projecting and extending so as to conform to the inner shape of the bottom surface of the cone and the bottom surface of the conical bottom, in the center of the tip portion of the screw. It is characterized by comprising.
[0017]
[Action]
According to the combination of the screw and the driver bit according to the present invention, the vertical end wall portion having a predetermined depth formed at the end edge portion of the bit fitting groove including the cross groove at the screw head of the screw, the side wall portion thereof, and the vertical portion A wing portion having a right-angled edge portion of a driver bit and a side wall portion thereof with respect to a groove bottom portion extending horizontally and inclined from the lower edge portion of the end wall portion toward the center portion of the screw neck portion, and the wing portion Vertically extending wings formed so as to project and extend so as to conform to the inner shape of the groove bottom and conical bottom of the screw bit fitting groove at the center of the tip of the screw In contact, it reduces the taper contact area to the bit fitting groove as in the conventional screw and driver bit combination, rather, the area of the side wall part where the tip of the driver bit abuts at the boundary where the adjacent bit fitting grooves intersect You can enlarge, thereby the occurrence of the come-out phenomenon of the driver bit can be prevented reliably.
[0018]
That is, according to the combination of the screw and the driver bit of the present invention, the wing part having the right-angled edge part and the side wall part of the driver bit, and one of the vertically extending wing parts protruding and extending in the center of the tip part of the wing part. part is directed to horizontally and inclined in the center of the screw neck from the lower edge portion of the bit fitting vertical end wall portion formed on the edge of the groove and its side wall and vertical end wall portions of the screw Engage with each of the extending groove bottoms, and the tip of the vertical extension wing provided at the center of the tip of each wing is adapted to the bottom of the conical slope formed at the center bottom of the screw. Thus, the screw is most suitable for the screw, and the occurrence of the driver bit cam-out phenomenon can be effectively prevented.
[0019]
Further, in the combination of the screw and the driver bit according to the present invention, the vertical end wall portion having a predetermined depth formed at the end edge portion of the bit fitting groove including the cross groove in the screw head of the screw, the side wall portion thereof, and the vertical portion. The groove bottom that extends horizontally and inclined from the lower edge of the end wall to the center of the screw neck and the gently inclined conical bottom formed at the center bottom of the groove bottom are each a conventional driver bit. It is also possible to use a conventional driver bit because it is configured to fit, and even in this case, the effect of preventing the occurrence of the cam-out phenomenon is exhibited and an appropriate screw tightening operation is achieved. It also has the advantage of being able to .
[0020]
【Example】
Next, an embodiment relating to a combination of a screw and a driver bit according to the present invention will be described in detail with reference to the accompanying drawings.
[0021]
1 and 2 show an embodiment of a screw in the combination of a screw and a driver bit according to the present invention. That is, in FIGS. 1 and 2, reference numeral 30 indicates a screw of this embodiment , and a bit fitting groove 32 is provided in a head portion 30 a of the screw 30. The bit fitting groove 32 forms a vertical end wall portion 32a having a predetermined depth at an end edge portion thereof, and a horizontal step portion 32b is provided via a slight taper portion from a lower edge of the end wall portion 32a. Next, an inclined groove portion 32c is formed from the horizontal step portion 32b toward the center of the screw neck portion 30b, and a substantially conical bottom surface 34 having a gentle inclination is formed at the bottom thereof. Reference numeral 33 denotes a substantially vertical side wall having an appropriate draft taper to be formed between the bit fitting groove 32 adjacent respectively. Therefore, these side wall portions 33 come into contact with and engage with side wall portions of the wing portion of a driver bit, which will be described later.
[0022]
As described above, the screw 30 according to the present embodiment is provided with the horizontal step portions 32b at the edge portions of the bit fitting grooves 32 of the screw head portion 30a, and is directed from the horizontal step portions 32b to the central portion of the screw neck portion 30b. and by extending an inclined groove portion 32c, respectively, the tapered contact area partially and to and less configuration for overall bit fitting groove 32, moreover boundary between the grooves adjacent bit fitting groove 32 The area of the side wall portion 33 with which the tip of the driver bit abuts can be enlarged. Further, the bit width of the bit fitting groove 32 is configured to match the thickness of the blade portion of the driver bit, which will be described later. Is preferred.
[0023]
FIG. 3 shows an embodiment of a driver bit 40 adapted to the screw 30 according to the embodiment. That is, the driver bit 40 of the present embodiment is fitted into the bit fitting groove 32 of the screw 30, and the vertical end wall portion 32 a and the horizontal step portion 32 b formed at the end edge portion of the bit fitting groove 32. Each of the wings 42 has an edge 42a extending at a substantially right angle to engage with each other, and extends from the horizontal step 32b of the bit fitting groove 32 toward the center of the screw neck 30b. The extended wings 42b are formed so as to be adapted to the shape of the inclined grooves 32c. Reference numeral 43 indicates a substantially vertical side wall portion which can allow a slight taper formed on both side surfaces of each of the wing portions 42 or the extended wing portions 42b . Accordingly, the side wall portion 43 comes into contact with and engages with the side wall portion 33 formed in the bit fitting groove 32 of the screw 30 in the above-described embodiment. Thus, in this embodiment , it is possible to effectively prevent the cam-out phenomenon that occurs in the conventional combination of screw and driver bit.
[0024]
FIG. 4 shows a modified example of the driver bit 40 shown in FIG. 3, in which the edge portion 42a extending at a right angle of the blade portion 42 in the driver bit 40 of the above embodiment is formed slightly longer and the extended blade portion. Is configured as a vertically extending wing portion 42c extending vertically downward. That is, in the driver bit 40 of the present embodiment, by forming the vertical extension wing portion 42c, this portion does not taper contact with the inclined groove portion 32c of the bit fitting groove 32 of the screw 30 in the above-described embodiment. It is comprised as follows. By thus configuring the driver bit 40, in which can be made more reliable prevention of come-out phenomenon.
[0025]
FIG. 5 shows a fitting operation between the screw 30 (see FIG. 1) and the driver bit 40 (see FIG. 3) according to the embodiment. That is, according to this embodiment, right-angled edges 42 formed in the wings 42 of the driver bit 40 and the extension blade portion 42b are respectively a horizontal step portion 32b of the bit fitting groove 32 of the screw 30 and the inclined groove portion 32c with fitted into the side wall portion 43 of each wing 42 and the extension blade portion 42b comes into contact with the side wall portion 33 of the bit fitting groove 32 of the screw 30. Therefore, a predetermined torque can be transmitted to the screw 30 by rotating the driver bit 40 in such a state .
[0026]
In particular, according to the present embodiment, the horizontal step portion 32 b is formed in the bit fitting groove 32 of the screw 30, so that the side wall 43 of the wing portion 42 of the driver bit 40 is abutted with the driver bit 40. It is possible to increase the contact area of the side wall 33 of the bit fitting groove 32 of the screw 30 in contact. In addition, since the tapered contact area where the inclined groove portion 32c of the bit fitting groove 32 of the screw 30 and the extended wing portion 42b of the driver bit 40 abut is partial and small, the cam-out generated in the conventional combination of the screw and the driver bit. The phenomenon can be surely prevented.
[0027]
FIG. 6 shows a modification of the fitting operation between the screw 30 and the driver bit 40 shown in FIG. That is, in this embodiment, the tip wing portion 42 of the driver bit 40 (bit shaft L1) is fitted to the bit fitting groove 32 of the screw head 30a with the required inclination angle θ on the screw shaft L0. Is. According to the present embodiment , even in the fitting operation between the screw 30 and the driver bit 40, a predetermined torque is applied to the screw 30 by rotating the driver bit 40 in the same manner as in the above embodiment. Can communicate. In this case, the allowable angle θ between the screw shaft L0 and the bit shaft L1 is preferably within about 15 °.
[0028]
FIG. 7 shows another embodiment of the screw in the combination of the screw and the driver bit according to the present invention. For convenience of explanation, the same reference numerals are assigned to the same components as those of the screw of the embodiment shown in FIG. 1, and the detailed description thereof is omitted. That is, in this embodiment, the screw of Figure 1, in place of the screw screw head 30a was dish, for the screw head 30a Ganabe shaped screw, applying the configuration of the present invention described above It is a thing. In the present embodiment, however, the curved groove portions 32d are formed from the vertical end wall portions 32a formed at the end edges of the bit fitting grooves 32 toward the center portion of the screw neck portion 30b, and the bottom portions thereof are formed. In FIG. 1, a substantially conical bottom surface 34 having a gentle slope is formed. Other configurations are basically the same as those of the embodiment screw shown in FIG.
[0029]
Even by using the screw 30 of this embodiment configured as described above, an appropriate screw tightening operation can be performed without causing a cam-out phenomenon in combination with the driver bit 40 of the above embodiment. In addition, the shape of the groove 32d of the bit fitting groove 32 formed on the screw head 30a of the screw 30 of the above embodiment can be tapered.
[0030]
For the screw of this embodiment, for example, in the driver bit 40 shown in FIG. 3, instead of the shapes of the right-angled edge portion 42a and the extended wing portion 42b of each wing portion 42, the bit fitting groove of the screw 30 is used. It may be in the shape of the groove of the curved groove 32d or taper formed on 32 and configuration of the wings 42, matched shape.
[0031]
FIG. 8 shows an embodiment of a header punch 50 for manufacturing the screw 30 in the embodiment shown in FIG. That is, the header punch 50 of the present embodiment is formed by punching the bit fitting groove 32 in the screw head 30a of the screw 30 shown in FIG. The header punch 50 of the present embodiment is a protruding piece having a right edge 52a for forming a vertical end wall 32a and a horizontal step 32b at the edge of the bit fitting groove 32 of the screw head 30a. 52, each of which has an inclined protrusion 52b for forming an inclined groove portion 32c extending from the protruding piece 52 toward the central portion of the screw neck portion 30b.
[0032]
In addition, as the header punch 50 for manufacturing the screw 30 of the embodiment shown in FIG. 7, in the header punch 50 of the embodiment shown in FIG. 8, the protruding piece 52 is a predetermined edge portion of the bit fitting groove 32. It is preferable that the vertical end wall portion 32a having a depth and a curved groove portion 32d extending from the end wall portion 32a be formed into a shape that can be formed.
[0033]
The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the spirit of the present invention.
[0034]
【The invention's effect】
As is clear from the above-described embodiment, according to the combination of the screw and the driver bit according to the present invention, a vertical of a predetermined depth formed at the edge of the bit fitting groove formed by the cross groove in the screw head of the screw. Right-angled edge of the driver bit and its side wall with respect to the groove bottom extending horizontally and inclined from the lower end of the end wall and its side wall and the lower edge of the vertical end wall toward the center of the screw neck And a vertical fitting wing formed so as to project and extend in the center of the tip of the wing, and a bit fitting like a combination of a conventional screw and a driver bit. It reduces the tapered contact area with the groove, but rather it is the tip of the driver bit in the intersecting boundary between the adjacent bit fitting groove is enlarged the area of the side wall portions abutting, thereby the driver bit Ca It is possible to reliably prevent the occurrence of out phenomenon.
[0035]
In the present invention, a vertical end wall portion and a side wall portion thereof having a predetermined depth are formed at the end edge portion of the bit fitting groove formed of the cross groove at the screw head, and the screw neck is formed from these end wall portions. By using a header punch with a protruding piece or a ridge , each of which forms a groove bottom portion extending horizontally or inclined toward the center portion of the portion and forming a substantially conical bottom surface at the center bottom portion, The screw according to the present invention can be easily manufactured.
[0036]
Incidentally, screws Oite used in the present invention, upon fitting of the driver bit, tapered contact area to the whole basic bit fitting groove, which has a partial and and small construction and with the driver bit By expanding the area of the side wall portion of the bit fitting groove with which the side wall portion of the tip abuts, the driver bit cam-out phenomenon is almost eliminated. Moreover, such an advantage can be obtained that this effect can be effectively exhibited even when a conventional driver bit is used .
[0037]
Thus, screws Oite used in the present invention, even using conventional driver bit (see FIG. 11), it is possible to achieve a proper screwing operation. However, in this case, due to the cam-out phenomenon , a part of the bit fitting groove is easily damaged (reference numeral 15) as shown in FIG. 10, for example. With conventional driver bits, it is no longer easy to tighten or remove the screws.
[0038]
However, screws Oite used in the present invention, in some of the bit fitting groove of the screw head, in the case where the fracture as described above also, by using the driver bit according to the present invention, Appropriate screw tightening operation and screw removal operation can be achieved without causing a cam-out phenomenon.
[0039]
In addition, according to the combination of the screw and the driver bit according to the present invention, the cam-out phenomenon occurs even when dust is clogged in the bit fitting groove of the screw or even if the screw shaft and the bit shaft are not on the same axis. The rotation of the driver bit 40 can be smoothly transmitted to the screw 30 without causing damage to the screw or the like, and a screw tightening operation with an appropriate torque can always be achieved quickly.
[0040]
That is, according to the combination of the screw and the driver bit according to the present invention, not only can the screw tightening operation always be performed with an appropriate torque on the object to be screwed made of various materials such as hard and soft materials. Therefore, the breakage of the screw can be greatly reduced, and the safety of the screw tightening operation and the improvement of the work efficiency can be achieved easily and economically.
[Brief description of the drawings]
FIG. 1 is a cross-sectional side view of an essential part of a screw in an embodiment of a combination of a screw and a driver bit according to the present invention.
FIG. 2 is a plan view of a screw head of the screw shown in FIG.
FIG. 3 is a side view of a main part of a driver bit in an embodiment of a combination of a screw and a driver bit according to the present invention.
4 is a side view of an essential part showing a modified example of the driver bit shown in FIG. 3. FIG .
5 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;
6 is a cross-sectional side view of an essential part showing a modified example of the coupling state of the screw shown in FIG. 1 and the driver bit shown in FIG. 3;
7 is a cross-sectional side view of an essential part showing another embodiment of the screw shown in FIG. 1. FIG.
8 is a side view of the main part of a header punch for manufacturing a screw forming the head of the screw shown in FIG. 1. FIG.
FIG. 9 is a cross-sectional side view of an essential part of a conventional cross groove screw.
10 is a plan view of the screw head of the cross groove screw shown in FIG. 9. FIG.
FIG. 11 is a side view of a main part of a conventional cross groove screw driver bit.
12 is a cross-sectional side view of an essential part showing a coupling state between the screw shown in FIG. 9 and the driver bit shown in FIG. 11;
[Explanation of symbols]
30 Screw 32 Bit fitting groove 32a Vertical end wall portion 32b Horizontal step portion 32c Inclined groove portion 32d Curved groove portion 33 Side wall portion 34 Conical bottom surface 40 Driver bit 42 Wing portion 42a Right angle edge portion 42b Extension wing portion 42c Vertical extending wing portion 43 Side wall Part

Claims (1)

It is equipped with wings that fit into the cross groove of the screw, respectively, and also fits the conventional driver bit formed as an extended wing that extends at a constant inclination with the tip of these wings oriented toward the center. A vertical end wall portion and a side wall portion of a predetermined depth are formed at the end edge portion of the bit fitting groove formed by the cross groove in the screw head of the screw, respectively, and from the lower edge portion of these vertical end wall portions A groove bottom portion extending horizontally and inclined so as to conform to the shape of the tip portion of the conventional driver bit toward the center portion of the screw neck portion is formed, and a conical bottom surface that is gently inclined at the center bottom portion A screw formed of,
A wing having a vertical edge wall portion of the bit fitting groove of the screw and a horizontally extending groove bottom portion and a side wall portion thereof and a right-angled edge portion and a side wall portion thereof; A driver bit provided with a vertically extending wing portion projecting and extending so as to conform to the inner shape of the bottom surface of the cone and the bottom surface of the conical bottom, in the center of the tip portion of the screw. A combination of a screw and a driver bit, characterized in that it is constructed.

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