JP6530632B2 - Cross-hole for screw - Google Patents

Description

  The present invention relates to a screw cross-hole that can be used with driver bits with different counts.

  2. Description of the Related Art A screw cross hole (Non-Patent Document 1) defined in Japanese Industrial Standard JIS B1012 is known as a drive hole that is often used for screw parts. And, as a driver bit used for this screw cross hole, a cross screw driver (non-patent document 2) defined in Japanese Industrial Standard JIS B4633 is known.

Japan Industrial Standard JISB1012 Cross Hole for Screws

Japan Industrial Standard JISB4633 cross screwdriver

  The screw cross holes are divided into five sizes according to the nominal diameter of the screw, and are numbered 0 to 4. On the other hand, the cruciform screw driver is divided into five sizes so as to correspond to the counters of the cross holes for screws, and is similarly assigned a counter of 0 to 4. The operator selects the first cross screwdriver for the screw cross hole and tightens the screw.

  Since the screw cross hole and the driver bit correspond to the same number one by one, the operator must prepare driver bits for all the numbers corresponding to the screw cross hole. In addition, in the case of an automatic screw tightening machine or an electric driver, it is necessary to change the driver bit according to the size of the cross hole for screw, and it takes time and cost for setup. As another problem, since the cross holes for screws for each number are similar in shape, screwing is performed using a driver bit of a different number according to a mistake and reamed out (phenomenon that the cross holes for screws are crushed) There was a problem of causing

  The present invention is created in view of the above-mentioned subject, and an object of the present invention is to provide a cross hole for screws which can be shared between driver bits having different counts.

  It consists of a central recess provided in the head of the screw part, four fitting grooves extending radially from the central recess, and a corner formed at the intersection of each fitting groove, and the corner is stepped The screw is characterized by the cross hole for screw. Preferably, the corner portions are configured such that driver bits of different sizes engage with each other in the upper and lower portions.

  Between the opposing corners, it comprises a central recess provided in the head of the screw part, four fitting grooves extending radially from the central recess, and a corner formed at the intersection of each fitting groove In a screw cross hole defined by a plurality of countes having different dimensions, the corner portion overlaps the slope of the bottom surface of the fitting groove with respect to the different cross holes and the inside of the large cross hole and the small cross According to a screw cross hole characterized in that a portion overlapping with a corner of the hole is cut away.

  According to the cross hole for screws of the present invention, since the corner portion has a stepped shape, driver bits different from each other are engaged with the corner portion of each step when the driver bit is inserted, so that the driver bit can be shared. Become.

  In addition, since the corner portion has a shape in which the bottom of the fitting groove is overlapped for cross holes different in count, and a portion where the inside of the large cross hole in the count and the corner of the small cross hole in the count overlap is cut off Even though the cross bit enables sharing of the driver bit, when the driver bit is rotated, a strength that does not crush the cross can be secured.

The figure which shows the whole structure of the cross hole for screws which concerns on this invention. FIG. 2 is a plan view of a screw cross hole according to the present invention. AA sectional view taken on the line of FIG. 2. BB sectional drawing of FIG. The top view of the 2nd cross hole. AA sectional view taken on the line of FIG. BB sectional drawing of FIG. The top view of the 3rd cross hole. FIG. 9 is a cross-sectional view taken along the line AA of FIG. The BB sectional drawing of FIG. The figure which accumulated FIG. 6 and FIG. The figure which accumulated FIG. 7 and FIG. The figure which accumulated FIG. 5 and FIG. The figure which shows the state which inserted the 2nd driver bit into the cross hole for screws based on this invention. The figure which shows the state which inserted the No. 3 driver bit in the cross hole for screws based on this invention. Front view of the driver bit. Bottom view of the driver bit. The AA sectional view taken on the line of FIG.

  Hereinafter, as an example of the screw cross hole according to the present invention, an embodiment of the screw cross hole 1 capable of sharing the second and third driver bits will be described based on the drawings. As shown in FIGS. 1 to 4, the screw cruciform hole 1 is formed in a head 2 connected to a screw (not shown).

  The screw cruciform hole 1 conforms to the H-shaped screw cruciform hole shown in Japanese Industrial Standard (JIS) B1012, and the second driver bit 200 and the third driver bit shown in FIGS. 14 and 15 to 17. It comprises a central recess 5 to which 300 can be fitted, and four fitting grooves 6 radially extending from the central recess 5. The fitting groove 6 has a bottom surface 6a, a clamping side surface 6b for transmitting a rotational force in the clamping direction by the driver bit, and a loosening side surface 6c for transmitting a rotational force in the loosening direction by the driver bit. Further, at the intersection of the fitting grooves 6, there is formed a corner 7 connecting the tightening side 6b and the loosening side 6c. The corners 7 are arranged to be point-symmetrical with respect to the center of the central recess 5 and the dimension between the corners is defined as the b dimension.

Here, Japanese Industrial Standard (JIS) B1012 defines a No. 0 to No. 4 screw cross hole, and as an example, an H-shaped No. 2 cross hole 20 is shown in FIGS. FIG. 10 shows an H-shaped third cross hole 30. The inclination angle θ of the bottom surfaces 26a, 36a of the fitting grooves 26, 36 is set to 26 ° 30 'in all the count values. On the other hand, the b dimension is different for all the count numbers, and is set to 0.605 mm, 0.965 mm, 1.47 mm, 2.41 mm, 3.48 mm in order of the 0th to 4th. In addition, the dimensions of each part of each count are as shown in Table 1.

  Further, Japanese Industrial Standard (JIS) B4633 defines driver bits corresponding to the respective counts of the H-shaped cross hole. The No. 2 driver bit 200 is formed on the shaft portion 201 and the tip of the shaft portion 202, as shown in FIGS. 16 to 18, and has four blades fitted in the fitting grooves 26 of the second cross hole 20. It consists of the part 202 and the valley part 203 formed in the part which each blade part 202 connects. The diameter b and the inclination angle α of the valley portion 203 coincide with the b dimension of the second cross hole 20 and the inclination angle α of the corner 27. For this reason, when the second driver bit 200 is inserted into the second cross hole 20, the valley portion 203 engages with the corner 27 of the second cross hole and bites. The third driver bit 300 has the same configuration except that the dimensions of the second driver bit and each part are different.

  The explanation will be returned to the screw cross hole 1 of the present invention, and the corner 7 has the side surfaces 7a and 7c connected to the tightening side surface 6b and the side surfaces 7b and 7d connected to the tightening side surface 6c. It is formed to be stepped with respect to the longitudinal direction, and has a step 8. The design concept of the step 8 will be described below. In FIG. 11 and FIG. 12, the cruciform holes indicated by solid lines are the second cruciform holes 20. The cruciform hole indicated by a two-dot chain line is the third cruciform hole 30. 11 overlaps the bottom surface 26a of the fitting groove 26 of the second cross hole 20 shown in FIG. 6 and the bottom surface 36a of the fitting groove 36 of the third cross hole 30 shown in FIG. Show the condition. When overlapping in this manner, as shown by a solid color of black and white in FIGS. 12 and 13, there is a region where the inside of the third cross hole 30 and the corner 27 of the 2 cross hole 20 overlap. By cutting out this area from the corner 27 of the two-cross hole 20, the step 8 is formed. Specifically, the regions to be cut out are the side surfaces 27c and 27d of the corner 27 of the second cross hole 20, the side surfaces 26b and 26c of the fitting groove 26 of the second cross hole 20, and the corner 37 of the third cross hole. It is a portion surrounded by the side surfaces 37 a and 37 b and the central recess 35 of the third cross hole 30.

  By providing the step portion 8 at the corner portion 7 as described above, as shown in FIGS. 1 to 4, in the side surfaces 7 a and 7 b forming the corner portion 7 of the upper stage, the corner portion of the third cross hole The side surfaces 37a and 37b of 37 appear, and the side surfaces 27c and 27d of the corner portion 27 of the second cross hole appear on the side surfaces 7c and 7d forming the lower corner portion 7. Further, the central recess 35 of the third cross hole 30 appears in the step portion 8 of the corner 7, and the side surfaces 26b and 26c of the fitting groove 26 of the second cross hole are on the side surfaces 6b and 6c of the fitting groove 6. As for the inclination angle θ of the bottom surface 6 a of the fitting groove 6, the same inclination angle θ as that of the second cross hole 20 and the third cross hole 30 appears. Therefore, the b dimension of the corner 7 of the upper stage is the b dimension of the third cross hole 30, and the b dimension of the corner 7 of the lower stage is the b dimension of the second cross hole 20.

  FIG. 14 is a view showing a state in which the third driver bit 300 is inserted into the screw cross hole 1, and the upper portion of the corner 7 and the valley portion 303 of the third driver bit 300 are engaged. Then, when the No. 3 driver bit 300 is rotated in the direction in which the screw is tightened, the blade portion 302 presses the side surface 6 b and the rotational force is transmitted.

  FIG. 15 is a view showing a state in which the No. 2 driver bit 200 is inserted into the screw cross hole 1, and the lower part of the corner 7 and the valley part 203 of the No. 2 driver bit 200 engage. Then, when the No. 2 driver bit 200 is rotated in the direction in which the screw is tightened, the blade portion 202 presses the side surface 6 b and the rotational force is transmitted.

  With such a configuration, when the driver bit is inserted in the screw cross hole 1, the valleys 303 and 202 of the driver bits 300 and 200 having different counts engage with the upper and lower portions of the corner portion 7, respectively. And, when the driver bit is rotated in the loosening direction or the tightening direction, the clamping side 6b and the loosening side 6c are such that the blade portions 302, 202 of the driver bit 300, 200 can catch the outer edge side of the side 6b, 6c. The cross hole can not be crushed because the area of sufficient turning radius can be secured. Also, in the conventional common cross hole, there is one in which driver bits different in count can be shared by setting the depth of the cross hole deeper than the specified dimension, but such a common cross hole is a cross hole As a negative effect of setting the depth deeply, the thickness of the portion connecting the head and the shaft of the screw (generally referred to as the lower part of the neck) becomes thin, so there is a problem that the head of the screw breaks at the time of tightening. It was On the other hand, the basic structure of the screw cross hole 1 of the present invention is a small cross hole of a gear number and the shape of the large cross hole of the gear number is applied to the upper part of the corner 7. Since the depth is not set unnecessarily deep, the problem caused by the conventional screw cross hole described above does not occur.

  Also, as another embodiment, it is also possible to share the driver bits of three count numbers. For example, in the case of a screw cross hole in which the fourth driver bit can also be shared, the fourth driver bit can be engaged with the upper stage by providing another step in the corner based on the above-described design concept. The screw cross holes configured to be able to engage the third driver bit in the middle stage and to be able to engage the second driver bit in the lower stage can share the driver bits of multiple count It becomes.

  The embodiment of the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention, and the S-shape shown in Japanese Industrial Standard (JIS) B1012 It is also possible to apply according to the screw cross hole. Further, the numbers that can be shared are not limited to 2 and 3. For example, it is also possible to share 1 and 2 driver bits.

Reference Signs List 1 screw cruciform 2 head 5 central projection 6 fitting groove 6a tightening side 6b loosening side 7 corner 7a, 7b side 8 step 20 second cross hole 30 third cross hole 200 second driver bit 300 third Driver bit

Claims (1)

Between the opposing corners, it comprises a central recess provided in the head of the screw part, four fitting grooves extending radially from the central recess, and a corner formed at the intersection of each fitting groove In a screw cross hole defined by a plurality of countes having different dimensions, the corner portion overlaps the slope of the bottom surface of the fitting groove with respect to the different cross holes and the inside of the large cross hole and the small cross A cross-hole for screws characterized in that a portion overlapping with a corner of the hole is cut away .

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