TWI878972B - Manufacturing and construction method of eccentric anti-loosening screw having reverse thrust - Google Patents

Abstract

A manufacturing and construction method of eccentric anti-loosening screws having reverse thrust comprises steps of drilling a hole in a polygonal cylinder; cutting from the center location along the direction of the left-handed screw to form an upper locking piece and a lower locking piece; turning the upper locking piece and the lower locking piece slightly apart to create a larger gap in order to perform spot welding for temporarily securing positions of the locking pieces; tapping the circular hole of the polygonal cylinder, wherein the present invention is applied to a screw during the tapping process until reaching the locking pieces and breaking the welding points in order to forcibly keep the upper locking piece and the lower locking piece clamped together. The eccentric surface in the direction of the left-handed screw causes the upper locking piece and the lower locking piece to generate inessential eccentric force that makes the locking pieces hard to become loose. Furthermore, when the anti-loosening element is tightened, the gap gradually becomes smaller, resulting in the lead angle (α) to be larger than the helix angle (β) between the anti-loosening element and the screw. Therefore, the anti-loosening element can generate reverse thrust to prevent the screw from becoming loose.

Description

Manufacturing and construction method of eccentric anti-loosening screw with thrust resistance

The present invention relates to the field of anti-loosening screw technology, and in particular to a manufacturing and construction method of an eccentric anti-loosening screw with thrust resistance, and the screw is used to prevent loosening and has an impedance force to prevent the screw from loosening, so that the fixing mechanism is more stable.

It is found that screws and nuts will not loosen if they are used on static objects. However, if they are used in equipment that runs for a long time and vibrates, the vibration generated by the equipment during operation will be transmitted to the screws or nuts, which can easily cause the aforementioned parts to loosen.

Therefore, the applicant of this case recently filed a patent application No. 110101012 in the Republic of China for an eccentric anti-loosening screw with a pull-out surface and its construction method. The second embodiment of the previous case is paragraphs [0010-0013], Figure 1, and Figure 12, which disclose an eccentric anti-loosening screw with a pull-out surface, which includes a screw and an anti-loosening component, wherein the screw is provided with an anti-loosening component, and the locking component is provided with a screw hole that penetrates the screw and can be screwed with a screw rod, as well as an eccentric surface and a pull-out surface, and the eccentric surface is located on one of the sides provided with the screw hole. The withdrawal surface extends outward from one end of the eccentric surface in a spiral manner to the top of the other end of the eccentric surface, and the axis of the spiral around the withdrawal surface coincides with the axis of the screw hole, and the thread in the screw hole also extends outward to the side of the withdrawal surface. In addition, when the withdrawal surfaces of the two locking pieces are attached to each other and form an anti-loosening assembly, a gap larger than the first state is reserved between the two locking pieces.

As shown in FIG. 3 and FIG. 4 of the previous case, the eccentric surface of the locking piece is locked in the right-hand direction. When the locking piece is tightened, it will cause an eccentric effect in which the axial force is small on one side and large on the other side. When the locking piece is tightened, a larger locking eccentric force will be formed. However, the locking piece lacks the resistance to reverse loosening, resulting in the loosening of the perfect anti-loosening assembly.

In view of this, the applicant of this case, based on his many years of experience in research and development in related fields, conducted in-depth research on the aforementioned deficiencies and actively sought solutions based on the aforementioned needs. After a long period of hard research and multiple tests, he finally completed the present invention.

The main purpose of the present invention is to provide a manufacturing and construction method of an eccentric anti-loosening screw with thrust resistance, which has an eccentric force anti-loosening function, and the anti-loosening assembly has a resistance force for screw reverse rotation after being combined, thereby achieving multiple anti-loosening effects.

To achieve the above-mentioned purpose, the specific implementation method of the present invention includes:

A forming step: drilling a hole at the center of a polygonal column so that the center of the polygonal column has a circular hole, and the diameter of the circular hole is suitable for the size corresponding to the pitch diameter of the screw rod of a screw;

A cutting step: firstly, a short distance vertical section is cut from the center of the aforementioned polygonal column along the axial direction, and then, one end of the vertical section is cut along the left spiral direction and connected to the other side of the vertical section, so as to form an upper locking member and a lower locking member having an eccentric surface by cutting;

An opening step: the upper locking member and the lower locking member are unscrewed along the cut eccentric surface, and the vertical section above enables the upper locking member and the lower locking member to separate to form a gap with a gradually expanding distance;

A spot welding step: spot welding the opened polygonal column on the outside to form a plurality of welding spots, so that the upper locking piece and the lower locking piece are temporarily fixed;

A tapping step: placing the aforementioned spot-welded polygonal column on a fixing tool, and tapping the circular hole in the middle of the polygonal column with a tapping tool, so that the upper locking piece and the lower locking piece have a continuous internal threaded portion, thereby completing an anti-loosening assembly;

A construction step: a screw assembly is set in a hole of an object to be fixed, and an anti-loosening assembly is screwed into the screw rod of the aforementioned screw, and the top of the upper locking fixture of the anti-loosening assembly is made to fit with the bottom surface of the object; a locking tool is used to rotate the upper locking fixture in a clockwise direction to break the welding point that fixes the upper locking fixture and the lower locking fixture, and a preload is continuously applied after the breakage; at the same time, the upper locking fixture and the lower locking fixture are fixed. The pores formed by the locking pieces gradually shrink, and the upper locking piece and the lower locking piece generate asymmetric eccentric forces by utilizing the eccentric surfaces in the left-hand spiral direction formed during cutting, and change the lead angle (α) between the screw rod portion of the screw and the anti-loosening component to be greater than the helix angle (β), thereby making the anti-loosening component have a resistance force to prevent the screw from reversing and an anti-loosening effect.

Please refer to FIG. 1 , the manufacturing and construction method of the eccentric anti-loosening screw with thrust resistance of the present invention has an anti-loosening function of eccentric force, and the anti-loosening assembly has a resistance to screw climbing after being combined, and the manufacturing method steps include: forming step A, cutting step B, opening step C, spot welding step D, tapping step E and construction step F.

As shown in FIG. 1 and FIG. 2, forming step A: drilling a hole at the center of a polygonal column 10 so that the polygonal column 10 has a circular hole 11 at the center. The diameter of the circular hole 11 is a size corresponding to the pitch diameter of a screw rod portion (not shown in FIG. 1 and FIG. 2). In the main embodiment of the present invention, the polygonal column 10 is a hexagonal column. In some embodiments, the polygonal column 10 with the circular hole 11 can be manufactured by using an extrusion mold, which may also be used in the present invention.

As shown in FIG. 1 , FIG. 3 , and FIG. 4 , the cutting step B is as follows: a short distance vertical segment B1 is first cut from the center of the aforementioned polygonal column 10 along the axial direction, see FIG. 3 , and a left spiral direction is cut from the upper end of the vertical segment B1 and connected to the lower side of the vertical segment B1 (i.e., the direction indicated by the dotted line in FIG. 3 ), and an upper locking member 21 and a lower locking member 22 having an eccentric surface are formed by cutting. The structural features of the upper locking member 21 and the lower locking member 22 will be described in detail later.

As shown in FIG. 1 , FIG. 5 , and FIG. 6 , the opening step C is to unscrew the upper locking piece 21 and the lower locking piece 22 along the eccentric surface of the cut. In this state, the upper locking piece 21 and the lower locking piece 22 will be separated (in this state, the height of the polygonal column 10 will increase). The vertical section B1 mentioned above enables the upper locking piece 21 and the lower locking piece 22 to be separated, and a gap H1 with a gradually expanding distance will be formed.

As shown in FIG. 1 and FIG. 7 , the spot welding step D is to spot weld the polygonal column 10 in the opened state on the outer side to form a plurality of welding points D1 so that the upper locking member 21 and the lower locking member 22 are temporarily fixed.

As shown in FIGS. 1 , 8 , 13 and 14 , in the tapping step E, the aforementioned spot-welded polygonal column 10 is placed on a fixing tool E1, and the circular hole 11 in the middle of the polygonal column 10 is tapped by a tapping tool E2, so that the upper locking member 21 and the lower locking member 22 have continuous internal threaded portions 211 and 221, thereby completing an anti-loosening assembly 20.

As shown in FIG. 1 and FIG. 9 , construction step F: a screw 30 is set in a hole 41 of an object 40 to be fixed, and the anti-loosening assembly 20 is screwed into the screw rod portion 31 of the aforementioned screw 30 , and the top of the upper locking piece 21 of the anti-loosening assembly 20 is made to fit with the bottom surface of the object 40 .

As shown in FIG. 1 , FIG. 10 , FIG. 11 , and FIG. 12 , the upper locking member 21 is rotated counterclockwise by the locking tool F1 to break the welding point D1 fixing the upper locking member 21 and the lower locking member 22 , and the preload is continuously applied after the breakage. In addition, the locking tool F1 drawn in this case is only for illustration. When actually used, it is a tool that can synchronously lock the anti-loosening assembly 20 , and the locking tool F1 is not the focus of this case, so it will not be described in detail; at the same time The gap H2 formed by the upper locking piece 21 and the lower locking piece 22 gradually decreases. In addition, the upper locking piece 21 and the lower locking piece 22 generate an asymmetric eccentric force by utilizing the eccentric surface in the left spiral direction formed during cutting, and change the lead angle (α) between the screw rod portion 31 of the screw 30 and the anti-loosening component 20 to be greater than the helix angle (β), thereby making the anti-loosening component 20 have a resistance force to prevent the screw from climbing and an anti-loosening effect.

As shown in FIGS. 1, 10, 11 and 12, the working principle of the aforementioned anti-loosening assembly 20 is that since the upper locking piece 21 and the lower locking piece 22 are temporarily connected together by spot welding, when the locking tool F1 rotates the anti-loosening assembly 20, the connected welding point D1 will be broken, and the lower locking piece 22 at the lower end will naturally generate a pressing force on the upper locking piece 21 at the upper end due to the rotation, thereby achieving an anti-loosening and anti-reversal impedance force.

As shown in FIG. 13 , the specific structure of the upper locking member 21 is as follows: an internal threaded portion 211 is provided which penetrates through and can be screwed with the screw portion 31, and an upper eccentric surface 212 and an upper withdrawal surface 213 are formed at the bottom of the upper locking member 21 by cutting step B. The upper withdrawal surface 213 extends from the bottom end of the upper eccentric surface 212 to the top end of the upper eccentric surface 212 in a left-hand spiral manner, and is formed through the upright section B1 of the cutting step B to form an upper stop wall 214.

As shown in FIG. 14 , the specific structure of the lower locking member 22 is as follows: the lower locking member 22 is disposed at the lower end of the upper locking member 21, and is provided with an internal threaded portion 221 that penetrates and can be threadedly engaged with the screw portion 31, and a left-handed lower eccentric surface 222 and a lower withdrawal surface 223 are formed at the top of the lower locking member 22 through a cutting step B, and the lower withdrawal surface 223 extends from the top end of the lower eccentric surface 222 to the bottom end of the lower eccentric surface 222 in a left-handed spiral state, and is formed into a lower stop wall 224 through a vertical section B1 of the cutting step B.

As shown in FIG. 10 and FIG. 11, when the upper locking member 21 is tightened, the solder joint D1 is broken, and the lower locking member 22 is driven by the locking tool F1 to rise along the upper eccentric surface 212 and the lower eccentric surface 222 and gradually press against the upper locking member 21. The upper eccentric surface 212 and the upper withdrawal surface 213 of the upper locking member 21, and the lower eccentric surface 222 and the lower withdrawal surface 222 of the lower locking member 22 are formed. When the surface 223 is tightened, an asymmetric eccentric force is generated, so that the upper locking piece 21 and the lower locking piece 22 are tightly engaged, thereby achieving the effect of eccentric anti-loosening. As shown in Figures 9 and 10, the hole H2 of the anti-loosening component 20 gradually shrinks, so that the lead angle (α) between the anti-loosening component 20 and the screw 30 is greater than the helix angle (β), so that the anti-loosening component 20 has a resistance force to prevent the screw from reversing.

In summary, the structure of this invention has never been seen in any books or periodicals or used publicly, and it truly meets the requirements for invention patent application. We sincerely request the Bureau to examine it and approve the patent as soon as possible. We would be very grateful.

It should be noted that the above is the technical principle used in the specific embodiments of the present invention. If the changes made according to the concept of the present invention still do not exceed the spirit covered by the description and drawings, they should be stated within the scope of the present invention.

A: forming step B: cutting step B1: upright section C: opening step D: spot welding step D1: welding point E: tapping step E1: fixing tool E2: tapping tool F: construction step H1, H2: aperture 10: polygonal cylinder 11: round hole 20: anti-loosening assembly 21: upper locking fixture 211: internal threaded part 212: upper eccentric surface 213: upper withdrawal surface 214: upper stop wall 22: lower locking fixture 221: internal threaded part 222: lower eccentric surface 223: lower withdrawal surface 224: lower stop wall 30: screw 31: screw part 40: Object 41: Hole

Figure 1: is a flowchart of the manufacturing and construction of the present invention. Figure 2: is a schematic diagram of the forming step. Figure 3: is a schematic diagram of the cutting step. Figure 4: is a perspective schematic diagram of the cutting step structure. Figure 5: is a schematic diagram of the opening step. Figure 6: is a perspective schematic diagram of the opening step structure. Figure 7: is a schematic diagram of the spot welding step. Figure 8: is a schematic diagram of the tapping step. Figure 9: is a schematic diagram of the construction. Figure 10: is a schematic diagram of the pore reduction during the construction of the anti-loosening component. Figure 11: is a perspective diagram of the structure of Figure 10. Figure 12: is a schematic diagram of the actual construction state. Figure 13: is a structural diagram of the upper locking fixture. Figure 14: is a structural diagram of the lower locking fixture.

A: Forming step B: Cutting step C: Opening step D: Spot welding step E: Tapping step F: Construction step

Claims (3)

A manufacturing and construction method of an eccentric anti-loosening screw with thrust resistance, comprising: A forming step: drilling a hole at the center of a polygonal column so that the center of the polygonal column has a circular hole, and the diameter of the circular hole is suitable for the size corresponding to the pitch diameter of the screw rod of a screw; A cutting step: cutting a short-distance vertical section from the center of the polygonal column along the axial direction, and then cutting from one end of the vertical section along the left spiral direction and connecting to the other side of the vertical section, and forming an upper locking piece and a lower locking piece with an eccentric surface by cutting; An opening step: unscrew the upper locking fixture and the lower locking fixture along the cut eccentric surface, and the aforementioned upright section allows the upper locking fixture and the lower locking fixture to be separated, forming a gap with a gradually expanding distance; A spot welding step: spot weld the aforementioned opened polygonal column on the outside to form multiple welding points, so that the upper locking fixture and the lower locking fixture are temporarily fixed; A tapping step: place the aforementioned spot-welded polygonal column on a fixing tool, and tap the circular hole in the middle of the polygonal column through a tapping tool, so that the upper locking fixture and the lower locking fixture have a continuous internal threaded portion, thereby completing an anti-loosening assembly; A construction step: a screw assembly is set in a hole of an object to be fixed, and an anti-loosening assembly is screwed into the screw rod of the aforementioned screw, and the top of the upper locking piece of the anti-loosening assembly is made to fit with the bottom surface of the object; the upper locking piece is rotated clockwise by a locking tool to break the welding point that fixes the aforementioned upper locking piece and the lower locking piece; at the same time, the aforementioned upper locking piece and the lower locking piece are formed The formed pores are gradually reduced by rotation. In addition, the upper locking piece and the lower locking piece generate asymmetric eccentric force by using the eccentric surface in the left spiral direction formed during cutting, and change the lead angle (α) between the screw rod of the screw and the anti-loosening component to be greater than the helix angle (β), thereby making the anti-loosening component have a resistance force to prevent the screw from reversing and an anti-loosening effect. The manufacturing and construction method of the eccentric anti-loosening screw with thrust resistance as described in claim 1, wherein the upper locking piece is provided with an internal threaded portion that penetrates and can be threaded with the screw rod portion, and an upper eccentric surface and an upper withdrawal surface are formed at the bottom of the upper locking piece by a cutting step, and the upper withdrawal surface extends from the bottom end of the upper eccentric surface to the top end of the upper eccentric surface in a left-hand spiral state, and is formed by a vertical section of the cutting step. The lower locking piece is arranged at the lower end of the upper locking piece, and the lower locking piece is provided with an internal threaded portion which penetrates and can be screwed with the screw rod portion, and a left-handed lower eccentric surface and a lower withdrawal surface are formed at the top of the lower locking piece through a cutting step, and the lower withdrawal surface extends from the top end of the lower eccentric surface to the bottom end of the lower eccentric surface in a left-handed spiral state, and forms a lower stop wall through a vertical section of the cutting step. A manufacturing and construction method for an eccentric anti-loosening screw with thrust resistance as described in claim 2, wherein when the upper locking piece is tightened, the lower locking piece will rise along the upper eccentric surface and the lower eccentric surface and gradually tighten with the upper locking piece, and the upper eccentric surface and the upper withdrawal surface provided on the upper locking piece, and the lower eccentric surface and the lower withdrawal surface of the lower locking piece will generate an asymmetric eccentric force when tightened, so that the upper locking piece and the lower locking piece are tightly engaged to achieve the effect of eccentric anti-loosening, and the lead angle (α) between the anti-loosening component and the screw is changed to be greater than the helix angle (β), so that the anti-loosening component has a resistance force to prevent the screw from reversing.