Screwdriver head structure

Abstract

The utility model relates to a screwdriver bit structure. The screwdriver bit structure comprises a body, wherein the body is provided with a working end, a plurality of first working parts and a plurality of second working parts; the first working part is provided with a plurality of first grooves, two ends of the first working part are provided with a first end and a second end, and the peripheral surface of the first working part is provided with a virtual first edge surface; a central shaft is arranged at the center of the working end, a bottom surface is arranged at the bottommost part of the groove of the second working part, a second angle is formed between the bottom surface and the central shaft, and the second angle has a minimum angle; a fourth distance is arranged between the two side edges, close to the first end, of the first working part, and the fourth distance is the minimum distance.

Description

Technical Field

[0001] The present utility model relates to a screwdriver bit structure, especially a screwdriver bit structure in which a plurality of first grooves are provided with a first distance, a second distance and a third distance, a first width, a second width and a third width, and when a second angle and a fourth distance meet the minimum value, it can fit various different specifications of screw holes. Background Art

[0002] A common screwdriver bit structure, such as U.S. Patent No.: US7322265B2, Taiwan, China Patent Application No.: 094219199, Patent Name: Composite Screwdriver Bit Structure.

[0003] However, the disadvantage of this common patent structure is that: the main body 10 only has the first working part 21 and the second working part 23 in a second-order state, and can only rotate two specifications of screw fasteners without expandability. Please refer to the Figure 2 and Figure 3 shown in the Taiwan Gazette of China. There is an opening angle between the second abutting surface 231 and the joint surface 22, that is, a corner shape at the inner ring 222. When the plurality of second abutting surfaces 231 rotate the bolt 30, it is difficult for the plurality of inner rings 222 to disperse their stress, and stress concentration will occur at the inner ring 222, making the main body 20 prone to fracture at the inner ring 222 during the operation process. When the first working part 21 or the second working part 23 rotates the bolt 30, there is no anti-slip effect between the plurality of first abutting surfaces 211 and the bolt 30 and between the plurality of second abutting surfaces 231 and the bolt 30.

[0004] In view of the above disadvantages of the common structure, the inventor, by virtue of years of experience in manufacturing, production and design in the relevant industry, finally developed a product of a screwdriver bit structure that can solve the drawbacks of the common structure. Summary of the Invention

[0005] The purpose of the present utility model is to provide a screwdriver bit structure with the function of stress dispersion, which can avoid the fracture of the working end at the first groove during the operation process, has a better service life during the operation of the working end, and has a larger contact area. When the working end contacts the screw hole, the plurality of first concave surfaces have better rotational friction, and it also has the structural advantage of fitting various different specifications of screw fasteners, and can fit various different specifications of screw holes to rotate, increasing the expandability and practicability of the present utility model.

[0006] To achieve the above purpose, a screwdriver bit structure of the present utility model is characterized in that it includes:

[0007] A body, which is in the structure of a screwdriver bit. One end of the body is provided with a working end. The working end is provided with a plurality of first working parts and a plurality of second working parts. The first working parts and the second working parts are arranged in an alternating annular pattern around the axis of the working end. Each of the first working parts is disposed between two of the second working parts, and each of the second working parts is disposed between two of the first working parts. The first working parts are in the shape of convex blocks, and the second working parts are in the shape of grooves. The number of both the first working parts and the second working parts is four, so that the cross-section of the working end is in a cross shape;

[0008] Each of the first working parts is provided with a plurality of first grooves. The plurality of first grooves are arranged in a straight line with unequal intervals or in a straight line with equal intervals. Each of the first grooves is parallel to each other. The depth of each of the first grooves is the same or different. The number of the first grooves is at least three, or the number of the first grooves is four, five or six. One end and a second end are provided at both ends of the first working part. The outer diameter of the second end is greater than the outer diameter of the first end. A virtual first side surface is provided on the outer peripheral surface of the first working part. The first side surface extends from the second end to the first end. The first side surface is in an inclined shape and is in a straight line shape;

[0009] Each of the first grooves is provided with a first concave surface. The first concave surface includes a first single arc, a first line and a second line. The first line is disposed on one side of the first single arc, and the second line is disposed on the other side of the first single arc. The first single arc is disposed between the first line and the second line. The first line and the second line are tangent to the first single arc. Viewed in a two-dimensional manner, the first line is in a horizontal shape. The first line is wound around the axis of the working end in a circular shape. The first concave surface is formed by a partial arc of the first single arc. After the centers of the plurality of first single arcs are connected, a connection line is formed. The connection line coincides with or is parallel to the first side surface;

[0010] The vertical distance between the center of the first single arc closest to the first end and the first end has a first distance. The vertical distance between the center of the second single arc and the first end has a second distance. The vertical distance between the center of the third single arc and the first end has a third distance;

[0011] The minimum outer diameter of the first concave surface closest to the first end is a first width. The minimum outer diameter of the first concave surface located in the middle position is a second width. The minimum outer diameter of the first concave surface closest to the second end is a third width;

[0012] The second working part includes two second side surfaces and a first arc. The two second side surfaces are arranged on two sides of the first arc. The two second side surfaces are symmetrical with respect to the first arc. The two second side surfaces are both tangent to the first arc. There is a first angle between the two second side surfaces. The first angle is between 88 degrees and 92 degrees, or the first angle is 90 degrees, or the first angle is 92 degrees;

[0013] A central axis is provided at the center of the working end. The bottommost part of the groove of the second working part has a bottom surface. There is a second angle between the bottom surface and the central axis. The second angle has a minimum angle;

[0014] There is a fourth distance between two sides of the first working part close to the first end. The fourth distance has a minimum distance;

[0015] An end part is provided at the working end. A first surface is provided on the end part. The first surface coincides with the first end. The first surface is flat. The first surface is a circular surface with a single diameter, or the first surface is a conical surface with a convex arc surface;

[0016] The first arc is closest to the first surface, so that the first surface forms a smaller area.

[0017] The effective gain of the present utility model lies in:

[0018] The multiple first grooves respectively have the first distance, the second distance and the third distance. The multiple first grooves respectively have the first width, the second width and the third width. Thus, the working end has the structural advantage of fitting various specifications of the screw fitting. The working end has the second angle and the fourth distance. The second angle meets the minimum angle. The fourth distance meets the minimum distance. When each specification has different minimum values, the second angle and the fourth distance meet the minimum values, and the working end can fit all the screw holes. Description of the Drawings

[0019] Figure 1 It is a three-dimensional view of the screwdriver bit structure of the present utility model.

[0020] Figure 2 It is a first cross-sectional schematic view of the screwdriver bit structure of the present utility model.

[0021] Figure 3 It is a second cross-sectional schematic view of the screwdriver bit structure of the present utility model.

[0022] Figure 4 It is a front view schematic view of the screwdriver bit structure of the present utility model.

[0023] Figure 5 It is a front view of the screwdriver bit structure of the present utility model.

[0024] Figure 6 is the structure of the screwdriver bit of the present utility model Figure 5 The sectional view at A - A

[0025] Figure 7 is the side view of the present utility model when fitting the first - specification screw - fitting

[0026] Figure 8 is the structure of the screwdriver bit of the present utility model Figure 7 The sectional view at B - B

[0027] Figure 9 is the side view of the present utility model when fitting the second - specification screw - fitting

[0028] Figure 10 is the structure of the screwdriver bit of the present utility model Figure 9 The sectional view at C - C

[0029] Figure 11 is the side view of the present utility model when fitting the third - specification screw - fitting

[0030] Figure 12 is the structure of the screwdriver bit of the present utility model Figure 11 The sectional view at D - D

[0031] Figure 13 is the sectional view of the second embodiment of the screwdriver - bit structure of the present utility model

[0032] Figure 14 is the three - dimensional view of the third embodiment of the screwdriver - bit structure of the present utility model Specific embodiments

[0033] First, please refer to Figures 1 to 6 as shown Figure 1 is the three - dimensional view of the screwdriver - bit structure of the present utility model Figure 2 is the first sectional - view schematic diagram of the screwdriver - bit structure of the present utility model Figure 3 is the second sectional - view schematic diagram of the screwdriver - bit structure of the present utility model Figure 4 is the front - view schematic diagram of the screwdriver - bit structure of the present utility model Figure 5 is the front view of the present utility model Figure 6 is Figure 5 The sectional view at A - A. The present utility model relates to a screwdriver - bit structure, which includes:

[0034] A body 10, the body 10 is in the structure of a screwdriver bit. One end of the body 10 is provided with a working end 11, and a workpiece is sleeved on the working end 11 to rotate it. The working end 11 is provided with a plurality of first working parts 12 and a plurality of second working parts 13. The first working parts 12 and the second working parts 13 are arranged in an alternating annular pattern around the axis of the working end 11. Each of the first working parts 12 is disposed between two of the second working parts 13, and each of the second working parts 13 is disposed between two of the first working parts 12. The first working parts 12 are in the shape of convex blocks, and the second working parts 13 are in the shape of grooves. The number of both the first working parts 12 and the second working parts 13 is four, making the cross-section of the working end 11 slightly in the shape of a cross;

[0035] The first working part 12 is provided with a plurality of first grooves 121. The plurality of first grooves 121 are arranged in a straight line with unequal intervals or in a straight line with equal intervals. Each of the first grooves 121 is parallel to each other. The depth of each of the first grooves 121 is the same or different. The number of the first grooves 121 is at least three, or the number of the first grooves 121 is four, five or six. The two ends of the first working part 12 are provided with a first end 122 and a second end 123. The outer diameter of the second end 123 is greater than the outer diameter of the first end 122. The outer peripheral surface of the first working part 12 is provided with a virtual first side surface 124. The first side surface 124 extends from the second end 123 to the first end 122. The first side surface 124 is in the shape of an inclined surface and is in a straight line;

[0036] To reduce the lines of the working end 11 in the present utility model Figure 2 and Figure 3 in the present utility model, Figure 2 and Figure 3 first omit the plurality of second working parts 13. Each of the first grooves 121 is provided with a first concave surface 125. The first concave surface 125 includes a first single arc 126, a first line 1261 and a second line 1262. The first line 1261 is disposed on one side of the first single arc 126, and the second line 1262 is disposed on the other side of the first single arc 126. The first single arc 126 is disposed between the first line 1261 and the second line 1262. The first line 1261 and the second line 1262 are tangent to the first single arc 126. Viewed in two dimensions, the first line 1261 is horizontal, and the first line 1261 is wound around the axis of the working end 11 in a circular shape. The first concave surface 125 is formed by a partial arc of the first single arc 126. After the centers of the plurality of first single arcs 126 are connected, they have a connection line 127. The connection line 127 coincides with, is parallel to, or slightly coincides with the first side surface 124;

[0037] Viewed in two dimensions, the vertical distance between the center of the first such first single arc 126 and the first end 122 has a first distance 128, the vertical distance between the center of the second such first single arc 126 and the first end 122 has a second distance 1281, and the vertical distance between the center of the third such first single arc 126 and the first end 122 has a third distance 1282;

[0038] The first distance 128 is between 0.90 MM and 1.20 MM, or the first distance 128 is between 1.0 MM and 1.05 MM, the second distance 1281 is between 1.75 MM and 1.88 MM, or the second distance 1281 is between 1.78 MM and 1.86 MM, the third distance 1282 is between 2.50 MM and 2.70 MM, or the third distance 1282 is between 2.55 M and 2.65 MM;

[0039] Viewed in two dimensions, the minimum outer diameter of the first concave surface 125 closest to the first end 122 is a first width 129, the minimum outer diameter of the first concave surface 125 in the middle position is a second width 1291, and the minimum outer diameter of the first concave surface 12 closest to the second end 123 is a third width 1292;

[0040] The first width 129 is between 2.30 MM and 2.50 MM, or the first width 129 is between 2.35 MM and 2.45 MM, the second width 1291 is between 3.45 MM and 3.60 MM, or the second width 1291 is between 3.48 MM and 3.55 MM, the third width 1291 is between 4.50 MM and 4.70 MM, or the third width 1291 is between 4.55 MM and 4.65 MM;

[0041] The second working part 13 includes two second side surfaces 131 and a first arc 132. The two second side surfaces 131 are arranged on two sides of the first arc 132. The two second side surfaces 131 are symmetric with respect to the first arc 132. The two second side surfaces 131 are both tangent to the first arc 132. Viewed in two dimensions, there is a first angle 133 between the two second side surfaces 131. The first angle 133 is between 88 degrees and 92 degrees, or the first angle 133 is 90 degrees, or the first angle 133 is 92 degrees;

[0042] A central axis 134 is provided at the center of the working end 11. The bottommost part of the groove of the second working part 13 has a bottom surface 135. There is a second angle 136 between the bottom surface 135 and the central axis 134. The second angle 136 has a minimum angle. The definition of the so-called minimum angle is that if there are five specifications in the German standard specification, i.e., the DIN specification, each specification has a maximum angle and a minimum angle. The second angle 136 is the minimum angle among all specifications, and the second angle 136 is 5 degrees 15 minutes.

[0043] There is a fourth distance 137 between the two side edges of the first working part 12 close to the first end 122. The fourth distance 137 has a minimum distance. The definition of the so-called minimum distance is that if there are five specifications in the German standard specification, i.e., the DIN specification, each specification has a maximum distance and a minimum distance. The fourth distance 137 is the minimum distance among all specifications, and the minimum distance 137 is 0.29 MM.

[0044] The working end 11 is provided with an end part 14. The end part 14 is provided with a first surface 141. The first surface 141 coincides with the first end 122. The first surface 141 is flat. The first surface 141 is a circular surface with a single diameter, or the first surface 141 is a conical surface with a slightly convex arc surface.

[0045] The first arc 132 can be closest to the first surface 141, so that the first surface 141 forms a smaller area.

[0046] During manufacturing, the plurality of first concave surfaces 125 are first processed with the first concave surface 125 closest to the second end 123. Then, for each of the first concave surfaces 125 from the second end 123 to the first end 122, the first surface 141 is processed, and finally the plurality of second working parts 13 are processed to complete the entire working end 11.

[0047] Please continue to refer to Figure 7 and Figure 8 as shown in Figure 7 is a side view of the screwdriver bit structure of the present utility model when it is engaged with a first specification of the screw member 20. Figure 8 is a cross-sectional view of the present utility model Figure 7 at B - B. As can be clearly shown in the figure, there is a screw member 20. When the working end 11 is inserted into the screw member 20 of the first specification, the screw member 20 is provided with a recessed screw hole 21. The first surface 141 is in contact with the bottommost part of the screw hole 21. Because the first working part 12 has the third distance 1282 and the third width 1292, all three of the first grooves 121 are recessed and sleeved in the screw hole 21 of the first specification, and the third first groove 121 protrudes slightly outside the screw hole 21. The contact area and frictional force between the first working part 12 and the screw member 20 have a better rotation effect, so that when the working end 11 rotates the screw member 20, the frictional force is increased.

[0048] Please continue to refer to Figure 9 and Figure 10 as shown Figure 9 is a side view of the screwdriver bit structure of the present utility model when it is sleeved with the screw fitting 20 of the second specification Figure 10 is of the present utility model Figure 9 A cross-sectional view taken along line C-C. When the working end 11 is inserted into the screw fitting 20 of the second specification, the first surface 141 is in contact with the bottommost part of the screw hole 21. Since the first working part 12 has the second distance 1281 and the second width 1291, the two first grooves 121 can be concealed and sleeved in the screw hole 21 of the second specification, and the working end 11 drives the screw fitting 20

[0049] Please continue to refer to Figure 11 and Figure 12 as shown Figure 11 is a side view of the screwdriver bit structure of the present utility model when it is sleeved with the screw fitting 20 of the third specification Figure 12 is of the present utility model Figure 11 A cross-sectional view taken along line D-D. When the working end 11 is inserted into the screw fitting 20 of the third specification, the first surface 141 is in contact with the bottommost part of the screw hole 21. Since the first working part 12 has the first distance 128 and the first width 129, the first groove 121 closest to the end 14 can be concealed and sleeved in the screw hole 21 of the third specification to rotate the screw fitting 20

[0050] When the plurality of first grooves 121 protrude from the screw hole 21, the protruding part accounts for less than 30% of the first groove 121, that is, 70% of the first groove 121 is hidden in the screw hole 21

[0051] There is a screw fitting 20 of the fourth specification. The screw fitting 20 of the fourth specification is larger than the screw fitting 20 of the first specification, that is, larger than Figure 7 the screw fitting 20 shown. When the screw fitting 20 of the fourth specification is sleeved with the working end 11, the three first grooves 121 are also hidden in the screw hole 21 of the fourth specification. The screwdriver bit structure has the structural advantage of being able to sleeve at least four different specifications of the screw fitting 20. Basically, it is not necessary to set the plurality of first grooves 121 to four. When the working end 11 is sleeved with the screw fitting 20 of the fourth specification, having three first grooves 121 rubbing against the screw hole 21 and having four first grooves 121 engaging and rubbing against the screw hole 21, there should basically be not much difference in friction

[0052] There is a screw fitting 20 of the fifth specification. The screw fitting 20 of the fifth specification is smaller than the screw fitting 20 of the third specification, that is Figure 11For the screw member 20 shown, when the screw member 20 of the fifth specification is sleeved with the working end 11, all the first grooves 121 protrude outside the screw hole 21. Although there is no frictional force between the first groove 121 and the screw hole 21, the working end 11 has the minimum second angle 136 and the fourth distance 137. Therefore, the working end 11 can also rotate the screw member of the fifth specification.

[0053] Please continue to refer to Figure 13 as shown Figure 13 which is a cross-sectional view of the second embodiment of the present invention. In this embodiment, the first concave surface 125 is formed by a partial arc of the first single arc 126. The center of the first single arc 126 is not within the range of the working end 11. The first single arc 126 is not provided with the first line 1261 and the second line 1262. After the centers of the plurality of first single arcs 126 are connected, there is a connecting line 127. The connecting line 127 is parallel to the first side surface 124.

[0054] Please refer to Figure 14 as shown Figure 14 which is a perspective view of the third embodiment of the present invention. The working end 11 is not provided with the second working portion 13. The number of the first working portions 12 is two. The two first working portions 12 are symmetric with respect to the working end 11. The body 10 is a structure of a flat head screwdriver.

[0055] The advantages of the screwdriver head structure of the present invention are as follows:

[0056] 1. The first concave surface 125 has at least the first single arc 126. When the working end 11 rotates the screw member 20, the plurality of first single arcs 126 have the effect of dispersing stress, avoiding the working end 11 from breaking at the first groove 121 during operation, and the working end 11 has a better service life during operation.

[0057] 2. The plurality of first concave surfaces 125 enable the working end 11 to have a larger contact area. When the working end 11 contacts the screw hole 21, the plurality of first concave surfaces 125 have better rotational frictional force.

[0058] 3. The plurality of first grooves 121 respectively have the first distance 128, the second distance 1281 and the third distance 1282. The plurality of first grooves 121 respectively have the first width 129, the second width 1291 and the third width 1292. Thus, the working end 11 has the structural advantage of sleeving screw members 20 of various different specifications. Please supplement with Figure 5 and Figure 7As shown, the working end 11 has the second angle 136 and the fourth distance 137. The second angle 136 meets the minimum angle, and the fourth distance 137 meets the minimum distance. When each specification has a different minimum value, the second angle 136 and the fourth distance 137 meet the minimum value, and the working end 11 can then fit all the screw holes 21 of the German standard specification.

[0059] 4. There are provided the first distance 128, the second distance 1281, and the third distance 1282, and there are provided the first width 129, the second width 1291, and the third width 1292. When the working end 11 rotates screw holes 21 of several specifications, there is at least one of the first grooves 121 between the working end 11 and the screw hole 21 having a clamping friction force. The first groove 121 will make the working end 11 and the screw hole 21 have a larger contact area. And when the second angle 136 and the fourth distance 137 meet the minimum value, the second angle 136 and the fourth distance 137 that meet the minimum value can meet the requirements of the maximum value, and the working end 11 can then fit screw holes 21 of various different specifications for rotation. This is the design principle of the working end 11.

[0060] 5. Please supplement with Figure 7 、 Figure 9 and Figure 11 As shown, there are three of the first grooves 121. Therefore, when the working end 11 is fitted with the screw hole 21, each of the first grooves 121 can be aligned with the screw hole 21 of each specification, and the positions of the first grooves 121 also have the function of identifying the screw holes 21 of each specification.

[0061] 6. The number of the first grooves 121 is at least three, that is, the working end 11 has the function of rotating screw members 20 of at least three different size specifications, thus increasing the expandability and practicality of the present utility model.

[0062] 7. The screw holes 21 have two relatively common shapes, namely cross-shaped and star-shaped. Please supplement with Figure 4 As shown, there are provided two second side surfaces 131 and one first arc 132. The two second side surfaces 131 can fit the cross-shaped screw hole 21 of the standard shape, and the first arc 132 can be closest to the first surface 141, making the first surface 141 form a smaller area. The first arc 132 and the first surface 141 can cooperate with the star-shaped screw hole 21, and the working end 11 can then rotate screw holes 21 of at least four specifications of cross-shaped and star-shaped.

[0063] 8. The first surface 141 can be received at the bottom of the threaded hole 21, so that there can be a larger mating area between the end portion 14 and the first working portion 12 and the threaded member 20, increasing the contact area between the working end 11 and the threaded hole 21, and preventing damage caused by relative friction when the working end 11 rotates the threaded member 20.

[0064] Therefore, the screwdriver bit structure of the present utility model has industrial applicability, novelty and progressiveness, and can truly meet the application requirements of a new patent, and an application is filed in accordance with the law.

Claims

1. A screwdriver bit structure, characterized in that: It includes: A body, which is in the structure of a screwdriver bit. One end of the body is provided with a working end. The working end is provided with a plurality of first working parts and a plurality of second working parts. The first working parts and the second working parts are arranged in an alternating circular pattern around the axis of the working end. Each first working part is disposed between two second working parts, and each second working part is disposed between two first working parts. The first working parts are in the shape of convex blocks, and the second working parts are in the shape of grooves. The number of both the first working parts and the second working parts is four, so that the cross-section of the working end is in a cross shape. The first working parts are provided with a plurality of first grooves. The plurality of first grooves are arranged in a straight line with unequal intervals or in a straight line with equal intervals. Each of the first grooves is parallel to each other. The plurality of first grooves expose screw holes. The depth of each first groove is the same or different. The number of the first grooves is at least three, or the number of the first grooves is four, five or six. The two ends of the first working part are provided with a first end and a second end. The outer diameter of the second end is greater than that of the first end. The outer peripheral surface of the first working part is provided with a virtual first side surface. The first side surface extends from the second end to the first end. The first side surface is in an inclined plane shape and is in a straight line shape. Each first groove is provided with a first concave surface. The first concave surface includes a first single arc, a first line and a second line. The first line is disposed on one side of the first single arc, and the second line is disposed on the other side of the first single arc. The first single arc is disposed between the first line and the second line. The first line and the second line are tangent to the first single arc. Viewed in a two-dimensional manner, the first line is in a horizontal shape. The first line is wound around the axis of the working end in a circular shape. The first concave surface is formed by a partial arc of the first single arc. After the centers of the plurality of first single arcs are connected, there is a connecting line. The connecting line coincides with or is parallel to the first side surface. The vertical distance between the center of the first single arc and the first end has a first distance. The vertical distance between the center of the second single arc and the first end has a second distance. The vertical distance between the center of the third single arc and the first end has a third distance. The minimum outer diameter of the first concave surface closest to the first end is a first width. The minimum outer diameter of the first concave surface at the middle position is a second width. The minimum outer diameter of the first concave surface closest to the second end is a third width. The second working part includes two second side surfaces and a first arc. The two second side surfaces are disposed on two sides of the first arc. The two second side surfaces are symmetrical with respect to the first arc. The two second side surfaces are both tangent to the first arc. There is a first angle between the two second side surfaces. The first angle is between 88 degrees and 92 degrees, or the first angle is 90 degrees, or the first angle is 92 degrees. A central axis is provided at the center of the working end. The bottommost part of the groove of the second working part has a bottom surface, and there is a second angle between the bottom surface and the central axis. The second angle has a minimum angle. There is a fourth distance between two side edges of the first working part close to the first end. The fourth distance has a minimum distance. The working end is provided with an end part, and the end part is provided with a first surface. The first surface coincides with the first end. The first surface is planar, the first surface is a circular surface with a single diameter, or the first surface is a conical surface with a convex arc surface. The first arc is closest to the first surface, making the first surface form a smaller area.

2. The screwdriver bit structure according to claim 1, wherein: Among them, The first distance is between 0.90 MM and 1.20 MM, or the first distance is between 1.0 MM and 1.05 MM. The second distance is between 1.75 MM and 1.88 MM, or the second distance is between 1.78 MM and 1.86 MM. The third distance is between 2.50 MM and 2.70 MM, or the third distance is between 2.55 M and 2.65 MM.

3. The screwdriver bit structure according to claim 1, wherein: Among them, The first width is between 2.30 MM and 2.50 MM, or the first width is between 2.35 MM and 2.45 MM. The second width is between 3.45 MM and 3.60 MM, or the second width is between 3.48 MM and 3.55 MM. The third width is between 4.50 MM and 4.70 MM, or the third width is between 4.55 MM and 4.65 MM.

4. The screwdriver bit structure according to claim 1, wherein: Among them, The definition of the so-called minimum angle is that if there are five specifications in the German standard specification, i.e., the DIN specification, each specification has a maximum angle and a minimum angle. The second angle is the minimum angle among all specifications, and the second angle is 5 degrees and 15 minutes.

5. The screwdriver bit structure according to claim 1, characterized in that: Among them, The definition of the so-called minimum distance is that if there are five specifications in the German standard specification, i.e., the DIN specification, each specification has a maximum distance and a minimum distance. The fourth distance is the minimum distance among all specifications, and the minimum distance is 0.29 mm.

6. The screwdriver bit structure according to claim 1, wherein: Among them, The plurality of first concave surfaces are first processed to be the first concave surface closest to the second end, and then in sequence for each first concave surface from the second end to the first end, then the first surface is processed, and finally the plurality of second working parts are processed to complete the entire working end.

7. The screwdriver bit structure according to claim 1, wherein: Among them, When the plurality of first grooves protrude from the screw hole, the protruding part accounts for less than 30% of the first groove, that is, 70% of the first groove is hidden in the screw hole.

8. The screwdriver bit structure according to claim 1, wherein: Among them, The first concave surface is composed of a partial arc of the first single arc, and the center of the first single arc is not within the range of the working end.

9. The screwdriver bit structure according to claim 1, characterized in that: Among them, The working end is not provided with the second working part. The number of the first working parts is two, and the two first working parts are symmetric with respect to the working end. The body is a structure of a flat head screwdriver.

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