TWI591267B - Screw head and tool for use therewith - Google Patents

Description

Screw head and the tools used

The present invention relates to a system for driving a screw and for maintaining it first with a screw and a tool, and then driving the screw into the backing.

The invention is applicable to any screw having a screw head with a straight side shaft sidewall recess and a screw having a near straight axial sidewall recess. More specifically, but not limited to, the present invention relates to a screw head having a hexalobular groove on the upper surface of the screw head, and a tool for the screw head. The tool, together with the screw head, contains a system for fixing the screws.

For the improvement of the straight groove of the conventional screw head, the Torx(TM) groove was developed. This has the general shape of a star and extends down to the screw head, providing a better fit than a straight slot. Other screws have shaped grooves on the screw head and have straight or nearly straight side walls. Examples are Phillips, Hex or Spline head screws. A complementary shaped tool (screwdriver) is used to drive the screw to the backing material, whether appropriate or not. If the forming groove extends too far down to the screw head, the lowest portion of the end of the groove can approach the bottom surface of the screw head. For example, the forming groove can access the outer tapered bottom surface of the cone screw and weaken the screw head. Several systems have been developed to overcome this and other shortcomings.

An example of two such systems is illustrated in two earlier patents associated with the Applicant. These are US 6,951,158 and US 7,730,812. US 6,951,158 gives a detailed review of prior art that will not be repeated.

In the specification of US 7,730,812 there is a screw head having a hexagonal flower-shaped groove on the upper surface. The curved wall of the groove is substantially parallel to the axis of the screw throughout its length and may be generally downwardly inwardly tapered at an angle of 1.5 deg. The base of the hexagonal flower shaped groove has a downwardly inwardly tapered transition surface resulting in a smaller central diameter of the additional central recess. This smaller additional recess has a tapered wall. While practical experience has led to the use of a wider range of tapered walls, the tapered wall can be tapered downward between 6 deg and 12 deg, for example, for a screw axis of 10.8333 deg, typically at 6.5 deg and 7.5 deg. Between 5% and preferably 7.5 deg.

The purpose of the additional recess is to cause the appropriately shaped tool (screwdriver) to be accurately inserted into the hexagonal flower-shaped groove of the screw head. The center end of the tapered section of the tool tip and the additional groove allow the screw to remain on the tool while the craftsman manipulates the screw to the position.

It is particularly useful for one-handed power tools and machine tools by pressure tightness to retain screws on the tool.

Other screws and tool systems are known for production and sale. Examples are the "anti cam out" ACR (TM) system and the Ribbed Phillips (TM) "anti-bumping" rib system. These systems have a drive system that utilizes ribs, but in these examples the ribs extend down to the screw head with an uninterrupted length and do not have a transitional tilt within the recess of the screw head.

The present invention is intended to significantly improve the system disclosed in US 7,730,812.

The present invention provides a screw, wherein the screw head has a groove on the upper surface of the screw head. The upper surface of the standard planar shape extends downward from the outer edge of the groove into the screw head, and the upper peripheral wall is substantially aligned with the axis of the screw to form a recess. The inclined transition surface extends downwardly inwardly with respect to the lower edge of the upper peripheral wall, and the additional recess extends downward from the lower edge of the inclined transition surface, wherein the size of the screw head is when the tool is dense by the upper and lower close portions When the screw head is combined, and wherein the upper abutting portion extends downward with respect to the axial direction of the screw to which the tool is fitted, the lower abutting portion further extends downward, and the inner wall of the additional concave portion has at least one protrusion (for example, a rib) Or a flat element) such that it has a twist due to the friction between the protrusion on the inner wall of the additional recess and the adhesive portion under the tool. Between the tool and the screw, the protrusion on the inner wall of the additional recess will cause significant friction between the tool and the screw, so that the screw does not fall off the tool.

In one form, the protrusions are helical and are disposed on the inner wall of the additional recess.

In another form, the projections are straight and are disposed on the inner wall of the additional recess and are aligned with the axis of the screw.

In this other form, preferably three projections are arranged with a radial spacing of 120 deg between the three projections.

The protrusions may extend to add the full depth of the recess.

The protrusion may extend in a direction parallel to the axial direction of the screw or may extend in a direction parallel to the circumferential direction of the screw.

Preferably, the wall of the additional recess is tapered downwardly inward to the bottom of the additional recess. More preferably, it is a cone between 2.5 deg and 12.0 deg (eg 10.8333 deg), typically between 6.5 deg and 7.5 deg, and preferably 7.5 deg+-tolerance.

Preferably, the upper peripheral wall extends conically downwardly inwardly to the upper edge of the inclined transition surface. More preferably, the taper is between 0.5 deg and 3 deg, typically between 1 deg and 2 deg, and advantageously 1.5 deg.

In a preferred form, the grooves in the upper surface of the screw are hexagonal.

In yet another form, the projections surround the interior of the screw at right angles to the axis of the screw in the plane.

The present invention also provides a tool tip for maintaining and driving a screw as described above, wherein at least one protrusion (such as a rib or a flat member) is provided on the outer surface of the close portion of the tool to closely fit the additional recess without A protrusion on the corresponding part of the screw head is then required. Preferably, the tool has three equally spaced protrusions (or ribs). The above discussion regarding the shape and extension of the protrusions also applies here. Thus, the protrusion can extend helically around the tool in the axial or circumferential direction of the tool.

The present invention also provides a system comprising the above-described screw combination of the above tools.

The present invention also provides a perforating needle for forming a protrusion on the wall of the screw as described above.

1‧‧‧screw head

2‧‧‧ slots

3‧‧‧ recess

6‧‧‧ Tools

9‧‧‧ peripheral wall

11‧‧‧Additional recess

12‧‧‧ inner wall

13‧‧‧ bottom

14‧‧‧ upper

15‧‧‧Sloping transition surface

16‧‧‧ Closed Department

17‧‧‧ center point

18‧‧‧Sloping transition surface

19‧‧‧ Space

21a‧‧‧ Protrusion

21b‧‧‧ Protrusion

22a‧‧‧punching needle

22b‧‧‧punching needle

23a‧‧‧Protruding hole

23b‧‧‧protruding holes

101‧‧‧ screw head

102‧‧‧ slots

103‧‧‧ recess

106‧‧‧ Tools

111‧‧‧Additional recess

112‧‧‧ inner wall

113‧‧‧ bottom

115‧‧‧Sloping transition surface

116‧‧‧ Closed Department

117‧‧‧ center point

121‧‧‧Protrusion

Illustrative examples of the invention and a particular embodiment will now be described by way of example with reference to the accompanying drawings in which: FIG. 1 is a schematic diagram showing a tool tip having a protrusion and a screw head recess; Is a part of Fig. 1; Fig. 2a is a first embodiment according to the protrusion in Fig. 1 A cross section of the line A1-A1; Fig. 2b is a cross section of the line A2-A2 in Fig. 1 according to the second embodiment of the protrusion; Fig. 3a illustrates a punching needle for forming a protrusion according to the first embodiment 3b is a schematic view showing a perforating needle for forming a protrusion according to the second embodiment; FIG. 4a is a cross section of the B1-B1 line in FIG. 3a; and FIG. 4b is a drawing in FIG. 3b. A cross-section of the B2-B2 line; Figure 5 illustrates a detailed side view of a particular embodiment of the tip of the close-fitting screw head; Figure 6 is a cross-section of the CC line in Figure 5; Figure 7 is a perforation A side view of the needle; and Fig. 8 is a cross section of the DD line in Fig. 7.

As schematically illustrated in Fig. 1, the screw head 1 has a groove 2 in the upper surface of the screw head 1. (The arrangement of the grooves is better illustrated in Fig. 5.) The groove 2 forms a straight-sided recess 3 having a cross section parallel to the plane of the upper surface of the screw head 1. The recess has a convex point and is on the different side of the point from the contact surface (not shown). These points are intended to be adhered by the tool 6 of the corresponding shape of the straight-sided recess 3.

The groove 2 has an additional central recess 11 at the bottom of the straight six-point recess 3 . The additional recess 11 is aligned with the axis of the screw and has a center therein. This additional recess 11 has a circular cross section and a smaller diameter than the recess 3. The wall 12 of the additional recess 11 is slightly inclined so that the bottom portion 13 of the additional recess 11 has a diameter slightly smaller than the upper portion 14 of the additional recess 11. The inclined transition surface 15 is formed in chase Between the upper portion 14 of the recess 11 and the lower portion of the wall 9 of the six-point recess 3.

It should be understood that when a particular embodiment is directed to a screw head having a six point recess 3, a screw having a plurality of other standard shaped recesses can incorporate the protrusions in accordance with the present invention.

The tool 6 has a contact portion 16 which is designed to fit the recess 3. The shape of the close portion 16 in the plan view corresponds to the shape of the recess 3. The diameter of the contact portion may be uniform or, as shown in Fig. 1, may be slightly tapered downward toward the inner side of the close portion. The taper can be from 1.25 deg to 1.75 deg (typically 1.5 deg). The size of the diameter of the contact portion 16 allows the adhesion portion 16 to be inserted into the recess 3 without difficulty.

The tool 6 also has a center point 17 of a circular cross section extending downwardly from the abutment portion 16. The diameter of the center point 17 of the tool 6 is slightly smaller than the diameter of the additional recess 11 of the screw head 1. The inclined transition surface 18 of the tool 6 extends outwardly from the center point 17 to the abutment portion 16. The angle of inclination of the transition surface 18 is less than the angle of inclination of the transition surface 15. Therefore, when the tool is inserted into the groove 2, a space 19 is formed between the surface 15 and the surface 18. The depth of the space 19 diverges towards the center point 17. When the tool enters the slot 2, the portion 16 of the tool 6 can be brought into close contact with the outer periphery of the upper portion of the wall 9 of the recess 3. The center point (or guiding point) 17 can generally have a length that is shorter than the height of the recess 3 so that the abutment 16 of the tool 6 enters the recess 3.

In the case of a screw having a surface coating for preservation purposes, the diverging space 19 allows any excess paint to be collected in the space 19 without hindering the adhesion between the tool 6 and the groove 2. If no space is provided, the excess paint residue may deposit on the surface 15 and the bottom 13 of the recess 11, thereby preventing sufficient adhesion between the tool 6 and the groove 2.

By pressing the adhesion portion 16 of the tool 6 and the center point 17 supported by the outer periphery of the upper portion of the wall 9 and the additional concave portion 11 to ensure that the screw can remain on the tool without falling off due to friction (ie, friction) . This mode of engagement is particularly effective in reducing the angular movement between the tool 6 and the screw head 1.

As shown in Figures 2a and 2b, the present invention differs from the prior art in that the screw head 1 has three inward projections on the wall 12 of the additional recess 11 of the screw head 1, the protrusion being as shown in Figure 2a. The rib 21a protrudes inwardly with respect to the wall 12, and the flat member 21b as shown in Fig. 2b. There may be more than three inward protrusions, but it is advantageous to use three protrusions to position the screw head 1 on the tool 6.

Each flat element 21b comprises a chamfered flat surface, wherein in Fig. 2b the circular cross section of the recess 11 is seen to form a straight line of chords connecting the ends of the arc. The flat surface of the flat member 21b includes the contact area between the independent projections and the tool 6. The flat surface of the flat member 21b is larger than the contact area between the independent rib 21a of Fig. 2a and the tool 6.

Within the scope of the invention, but not shown in the form of a particular embodiment, there may be only one protrusion, such as a rib or flat element. This can form a straight line on the wall of the additional recess in the screw, and the length is aligned with the axis of the screw or can be formed as a standard helix on the wall of the additional recess in the screw.

Figs. 3a and 4a show the piercing needle 22a for forming the inner surface of the additional recess 11 in the screw head 1 in order to manufacture a projection such as the rib 21a. Figs. 3b and 4b illustrate that the piercing needle 22b forms the inner surface of the additional recess 11 in the screw head 1 to form a projection such as the flat member 21b. The process of establishing the protrusion holes 23a, 23b on the punching needle starts by removing the material from the punching needle Oversized "near net" guide shape. The raised holes can be extruded, machined or otherwise created on the "near net" guiding shape. The material can be removed from the "near net" guiding shape to create the final guiding shape. Therefore, the punching needle includes at least one protruding hole 23a, 23b to form at least one protrusion 21a, 21b on the inner wall 12 of the additional recess 11. Therefore, during the screw manufacturing process, the punching needle will form a projection in the additional recess 11 in the screw head 1 of the screw.

More detailed drawings of actual embodiments of the present invention are now illustrated in Figures 5 through 8. Like element symbols are used for components similar to those illustrated in Figures 1 and 2.

The screw head 101 has a hexagonal flower-shaped groove 102 on the upper surface, and a straight-sided six-point recess 103 is formed to extend axially downward to the screw head. The hexagonal flower shape of the groove 102 has a protruding point and is on the different side of the point from the sealing surface. The additional recess 111 of the smaller cross section is located at the center of the axis of the screw and deeper into the screw head than the recess 103. The wall 112 of the additional recess 111 is slightly inclined, so that the additional recess 111 is slightly conically downwardly inward to the bottom 113 of the recess. The inclined transition surface 115 connects the base of the recess 103 and the top of the additional recess 111 of the screw head 101.

The hexagonal flower slot is an internal drive technology feature as described in ISO 10664.

The tool 106 has a snug surface 116 that is designed to fit the hexagonal flower shaped recess 103. The shape of the contact surface 116 in plan view corresponds to the shape of the recess 103. The abutment surface 116 may be slightly tapered toward the lower end of the abutment surface 116.

At the same time, the conical surface may have a taper in the range of 0.5 deg to 3.5 deg, the taper is usually between 1.25 deg and 1.75 deg, and 1.5 deg is advantageous.

The center point 117 of the tool 106 is slightly tapered to be in close contact with the additional recess 111 of the screw head 101. In the additional central recess 111, the downward inward taper is slightly lower than 11 deg. (10.833). However, finite element analysis studies can show that a taper of 7.5 deg or steeper gives a better flaw between the screw head and the tool.

According to the invention, the additional recess 111 on the screw head 101 has three inwardly facing projections, here shown as ribs 121 on the inner surface. The protrusions can of course also be formed as flat elements as shown in Fig. 2b. These projections, as shown by ribs 121, are parallel to the axis of the screw and are in close contact with the outwardly facing wall of the center point 117 of the tool 106, and the friction between the projections and the tool is established so that the screw can be retained. The tool does not fall off. This can best be seen in the cross section of Figure 6. The protrusions (ribs or flat elements) provide a better fit of the drive tool 106 to the screw head 101. It is also possible to have only one protrusion, which is not illustrated in the embodiment of the invention. In addition to being aligned with the shaft of the screw, the projection can spirally run on the inner surface of the additional recess 111.

The height of the protrusions may be from 5% to 25% of the diameter of the additional recess 111. The protrusions may occupy between 1% and 10% of the circumference, but may also be smaller or larger.

The particular embodiment of the invention described above shows that the invention can be applied to a particular (hexagonal) form of the screw head. However, many other screw heads having protrusions can be provided with reference to the particular embodiment described, and in fact the protrusions can be formed with tools (screwdrivers) for use with those other screw heads. on.

For example, in the case of a hexagonal or Spline drive screw or the like.

While the preferred embodiment of the invention has been shown and described, it is understood that

It can be noted that the abutment 16 of the tool 6 that is in close contact with the six-point recess 3 will transmit torque from the tool to the screw. The additional recess 11 is preferably provided with a substantially circular cross section (when the protrusion 21 is not considered).

Advantages of the invention

Due to the significant increase in contact pressure, the protrusions on the inner surface of the recess guiding holes are expected to improve the press-fit attachment with tip guidance, thereby increasing the confidence that the craftsman's screws will stick to the tool.

A slight deformation of the protrusion will extend to a certain extent to assist adhesion with a similar effect.

In addition, the protrusions will allow excess fastening material to be displaced to adjacent areas after the tip is inserted, thereby reducing the negative impact of the coating on the attachment.

1‧‧‧screw head

2‧‧‧ slots

3‧‧‧ recess

6‧‧‧ Tools

9‧‧‧ peripheral wall

11‧‧‧Additional recess

12‧‧‧ inner wall

13‧‧‧ bottom

14‧‧‧ upper

15‧‧‧Sloping transition surface

16‧‧‧ Closed Department

17‧‧‧ center point

18‧‧‧Sloping transition surface

19‧‧‧ Space

Claims (21)

A screw having a shaft and including a screw head (1) having a groove (2) on an upper surface of the screw head, wherein: an upper peripheral wall (9), the upper peripheral wall ( 9) extending downwardly from the outer edge of one of the slots into the screw head, the upper peripheral wall (9) being substantially parallel and aligned with the axis of the screw to form a recess (3); a sloped transition surface (15) The inclined transition surface (15) extends downwardly and inwardly with respect to the lower edge of the upper peripheral wall (9); and an additional recess (11) from which the additional recess (11) transitions ( 15) The lower edge extends downwardly, the additional recess (11) includes an inner wall (12), wherein the screw head is adapted to be in close contact with a tool (6) having the upper peripheral wall (9) one of the upper contact portions (16) and one of the lower contact portions (17) in close contact with the additional concave portion (11), and wherein the inner wall (12) of the additional concave portion (11) is attached Providing at least one protrusion (21a, 21b) such that when the screw head (1) is in close contact with the tool (6), the at least one protrusion on the inner wall (12) of the additional recess (11) Friction between (21a, 21b) and the lower adhesion portion (17) of the tool (6) And have a combination. A screw according to claim 1, wherein the protrusion is spiral and disposed on the inner wall (12) of the additional recess (11). The screw of claim 1, wherein the protrusion is straight and disposed on the inner wall (12) of the additional recess (11) and aligned with the shaft of the screw. The screw of claim 3, wherein the three protrusions are arranged with a radial spacing of 120 deg between the three protrusions. A screw according to any one of claims 1 to 4, wherein the protrusions extend toward the full depth of the additional recess (11). The screw of claim 1, wherein the at least one protrusion is a rib. The screw of claim 1, wherein the at least one protrusion is a flat element. The screw of claim 1, wherein the wall of the additional recess (11) is tapered downwardly inward to the bottom portion (13) of the additional recess (11). The screw of claim 8, wherein the taper is between 2.5 deg and 12.0 deg. The screw of claim 9, wherein the taper is between 6.5 deg and 7.5 deg, and preferably 7.5 deg. A screw according to claim 1, wherein the upper peripheral wall (9) tapers downwardly inwardly to the upper edge (14) of the inclined transition surface (15). The screw of claim 11, wherein the taper is between 1 deg and 3 deg. The screw of claim 11, wherein the taper is 1.5 deg. The screw of claim 1, wherein the at least one protrusion surrounds the inside of the screw at a right angle to the axis of the screw in a plane. The screw of claim 1, wherein the groove in the upper surface of the screw is hexalobular. A tool (6) for maintaining and driving a screw as claimed in any one of claims 1 to 15, the tool (6) comprising one of the upper peripheral wall (9) of the screw (2) An upper sealing portion (16) and a lower sealing portion (17) in close contact with the additional concave portion (11) of the screw (2), wherein an outer surface of one of the upper sealing portions (16) of the tool There is at least one protrusion thereon so that the protrusion (21) on the corresponding portion of the screw head is no longer needed. The tool of claim 16 having three equally spaced protrusions. The tool of claim 16 or 17, wherein the at least one protrusion is a rib. The tool of claim 16 or 17, wherein the at least one protrusion is A flat component. A system comprising the screw of any one of claims 1 to 15 in combination with the tool of any of claims 16 to 19. A perforating needle (22a, 22b) is formed in the additional recess (11) in the screw head (1) of the screw according to any one of claims 1 to 15, the perforating needle (22a, 22b) ) comprising at least one protrusion hole (23a, 23b) for forming the at least one protrusion on the inner wall (12) of the additional recess (11).