Bolt device for axial force increasing or precision controller

Abstract

The present invention relates to a multiple-thread screw assembly constructed with different pitches, the assembly comprising; a reference screw (11) which consists of female threads pre-machined into a part of a product or is provided as a female screw; a multiple screw (21) including male threads having the same pitch as that of the female threads so as to be tightened to the female screw, and female threads having a pitch different from that of the male threads at the center of the male screw; and a counter screw (31) having male threads having the same pitch as that of female threads so as to be simultaneously tightened into the female threads formed at the center of the multiple screw (21) when the multiple screw (21) is tightened into the reference screw (11).

Description

Bolt device for increasing axial force or precision controller

[0001] The present invention relates to a multi-joint screw, and more particularly, to a bolt device including a nut in which, when a screw on one side is rotated and tightened due to the formation structure of bolts or nuts having different thread pitches, the screw on the other side having a different pitch from the one side is slowed down in forward and backward movement at a certain rate to increase axial force, or allows for fine forward or backward movement to enable precise control.

[0002] In general, bolts and nuts fastened to bolts are mechanical elements used to secure objects or adjust the distance between objects or the position of objects.

[0003] These bolts and nuts require significant force when tightened to securely fasten an object. They must be used within the specified maximum tightening force range. The force required for tightening can be expressed as tightening torque, which is proportional to the size and pitch of the bolt or nut. In other words, a shorter size and pitch results in a smaller tightening torque, while a longer size and pitch result in a larger tightening torque.

[0004] When rotating a bolt or nut to adjust the distance between objects or the position of the objects, the movement of the position according to the rotation depends on the pitch. If the pitch is shortened, fine adjustment is possible with a short position movement per rotation, but there is a problem in that the screw threads also become smaller and a large force cannot be applied.

[0005] The present invention is to provide a screw device that can obtain a large axial force with a small force by a method of combining a bolt with a different pitch and a nut fastened to the bolt in order to solve the above-mentioned problem, and can obtain a large axial force by having a long pitch and a large screw, while allowing for fine adjustment by moving the axial movement very short compared to the pitch per rotation.

[0006] In order to achieve the above-mentioned purposes, a bolt device for increasing axial force or precision controller according to one embodiment of the present invention is disclosed.

[0007] A female thread with a different pitch is machined inside a male thread formed with a fixed pitch, and a male thread with a matching pitch is fastened to the internal female thread. A multi-structure screw with a female thread formed inside that has a male thread with a different pitch is filled in a fixed structure where the female thread is formed or a nut is prepared. When the filled multi-structure bolt is tightened, the distance per revolution is obtained equal to the pitch difference between the male thread and the female thread inside the male thread.

[0008] According to the bolt device for increasing axial force or for precision control of the present invention, a large axial force can be obtained with a small tightening torque, and at the same time, the distance per rotation is minute, allowing for precise adjustment. Another benefit is the anti-loosening effect that prevents the screw from loosening in environments with high vibration.

[0009] Figure 1 shows a front view and a cross-sectional view of a bolt device for increasing axial force or precision controller to explain an embodiment of the present invention.

[0010] Figure 2 is an exploded perspective view illustrating an embodiment of the present invention.

[0011] Figure 3 is a drawing for explaining the operation according to the first embodiment of the present invention.

[0012] Figure 4 is a drawing for explaining the operation according to the second embodiment of the present invention.

[0013] Figure 5 is a drawing for explaining the operation according to the third embodiment of the present invention.

[0014] Figure 6 is a drawing for explaining the operation according to the fourth embodiment of the present invention.

[0015] 10: Assembly and disassembly lines 11,12,13,14: Standard screws

[0016] 21,22,23,24: Multi-thread 31,32,33,34: Counter-thread

[0017] 101,201,301,401: Narrow indicators

[0018] 102,202,302,402: Wide indicator

[0019] A1,B2,C3,D4,E5,F6,G7,H8,I9,J10: 1st operation position

[0020] a1,b2,c3,d4,e5,f6,g7,h8,i9,j10: 2-movement position

[0021] The best form of the present invention is illustrated in Fig. 1.

[0022] The present invention is susceptible to various modifications and takes various forms. Specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention. Furthermore, it should be noted that the shapes, sizes, and spacing between elements in the attached drawings may be reduced or exaggerated for clarity.

[0023] The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprise" or "have" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0024] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0025] In the description of the present invention, a screw that is connected to a male screw should be understood as a female screw unless otherwise defined, even if it is not expressed as a female screw, and a screw that is connected to a female screw should be understood as a male screw unless otherwise defined, even if it is not expressed as a male screw.

[0026] In explaining the present invention, if it is judged that the detailed description of related known functions that are obvious to those skilled in the art and may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

[0027] For a clear explanation in the drawings attached to the present invention,

[0028] The spacing of the wide markers (102, 202, 302, 402) indicating the 1st action position (A1, B2, C3, D4, E5, F6, G7, H8, I9, J10) is shown to be 5 times that of the narrow markers (101, 201, 301, 401) indicating the 2nd action position (a1, b2, c3, d4, e5, f6, g7, h8, i9, j10).

[0029] FIG. 2 is an exploded perspective view of a bolt device for increasing axial force or precision controller for explaining a first embodiment of the present invention.

[0030] A multi-screw (21) having a female thread of a reference pitch formed inside the reference screw (11) and a male thread of a reference pitch formed outside the formed female thread so that it can be filled in the reference screw (11), and a female thread of a shorter pitch than the reference pitch formed in the inner center of the formed male thread is fastened along the assembly and disassembly line (10). A counter screw (31) that is capable of moving left and right but is prevented from rotating is fastened along the assembly and disassembly line (10) to the female thread formed inside the multi-screw (21). In the above description, the left and right in the movement left and right refers to movement along the assembly and disassembly line (10) of FIG. 2, and is the same as the left and right in the cross-sectional view illustrated in the present invention.

[0031] In order to observe the change in position of the multiple screw (21) and the counter screw (31) when fastened along the assembly and disassembly line (10), a narrow indicator (101) and a wide indicator (102) are shown. The narrow indicator (101) and the wide indicator (102) are shown only for explanation and are not included in the components of the product of the present invention.

[0032] An example of a fastened assembly along the assembly and disassembly line (10) of Fig. 2 is shown in Fig. 1.

[0033] In the embodiment illustrated in Fig. 1, the reference screw (11), the multiple screw (21), and the counter screw (31) are all connected and tightened to the end, and the cross-section AA extracted by line A is also illustrated on the right.

[0034] Referring to Fig. 1, when the reference screw (11), the multiple screw (21), and the counter screw (31) are all fastened, the end face of the multiple screw (21) matches the leftmost mountain among the three mountains of the wide indicator (102), and the end face of the counter screw (31) matches the leftmost mountain among the three mountains of the narrow indicator (101).

[0035] In order to explain in detail when all are tightened and when all are loosened in the above-described example, the operation according to the first embodiment is illustrated in detail in Fig. 3.

[0036] Referring to Figure 3, Figure (A) is a drawing showing when the screw is tightened to the end, and Figure (a) is a cross-sectional view extracted along the center of Figure (A).

[0037] Figure (B) of Figure 3 is a drawing showing an intermediate process of screw tightening, and Figure (b) is a cross-sectional view extracted along the center of Figure (B).

[0038] Figure (C) of Figure 3 is a drawing showing when the screw is completely loosened, and Figure (c) is a cross-sectional view extracted along the center of Figure (C).

[0039] In the first operation position (C3) of Fig. 3 (C), when the multi-screw (21) is completely loosened, the end face of the multi-screw (21) matches the rightmost mountain among the three mountains of the wide indicator (102), and at this time, the relative screw (31) that is allowed to move left and right but is prevented from rotating matches the rightmost mountain among the three mountains of the narrow indicator (101) like the second operation position (c3).

[0040] When the multi-screw (21) is tightened at the 1st operation position (C3) of (C) of Fig. 3, the intermediate process of Fig. (B) is passed, and when the screw is further tightened to the end, it proceeds to the 1st operation position (A1) of Fig. (A). When the multi-screw (21) is tightened at the 1st operation position (C3) of (C) of Fig. 3 and the 1st operation position (B2) of Fig. (B), which is an intermediate process, is reached, the counterpart screw (31) coincides with the 2nd operation position (b2). At this time, the distance moved from the 1st operation position (C3) to the 1st operation position (B2) is 5 times the distance moved from the 2nd operation position (c3) to the 2nd operation position (b2). The distance moved when the multi-screw (21) rotates once is 5 times the distance moved by the counterpart screw (31). The movement distance of the counter screw (31) is five times shorter than the movement distance of the multiple screw (21).

[0041] The relationship between the distance moved by the multiple screw (21) when the multiple screw (21) rotates once and the distance moved by the counter screw (31) is determined by the following equation. If the screw pitch of the reference screw (11) is X, the screw pitch of the counter screw (31) is Y, and the distance moved by the counter screw (31) when the multiple screw (21) connected to the reference screw (11) rotates once is Q, then the equation is X - Y = Q, and if the ratio of the distance moved by the counter screw (31) and the distance moved by the multiple screw (21) is a reduction ratio, then the reduction ratio is X : Q.

[0042] In Fig. 3, if the screw pitch X of the reference screw (11) is 5 mm and the screw pitch Y of the counterpart screw (31) is 4 mm, the distance moved Q is 1 mm by the formula X - Y = Q, and at this time, the reduction ratio is 5:1. In the formula X - Y = Q, if X is greater than Y and Q is positive, the moving direction of the multi-screw (21) and the moving direction of the counterpart screw (31) are the same, and if X is smaller than Y and Q is negative, the moving direction of the multi-screw (21) and the moving direction of the counterpart screw (31) are opposite.

[0043] As another example of a reduction ratio in Fig. 3, if the screw pitch X of the reference screw (11) is 5 mm and the screw pitch Y of the counterpart screw (31) is 4.5 mm, the distance moved Q is 0.5 mm according to the formula X - Y = Q, and the reduction ratio at this time is 10:1.

[0044] An example in which the movement direction of the multi-screw (21) in Fig. 3 and the movement direction of the counter screw (31) are opposite to each other is illustrated in detail as a second embodiment in Fig. 4.

[0045] Figure (D) of Figure 4 is a drawing showing when the screw is tightened to the end, and Figure (d) is a cross-sectional view extracted along the center of Figure (D).

[0046] In the first operation position (D4) of Fig. 4, when the multi-screw (24) is tightened to the end, the end face of the multi-screw (24) matches the leftmost mountain among the three mountains of the wide indicator (402), and at this time, the relative screw (34) that is allowed to move left and right but is prevented from rotating matches the rightmost mountain among the three mountains of the narrow indicator (401) as in the second operation position (d4).

[0047] When the multi-screw (24) is loosened at the first operation position (D4) of Fig. 4 (D), it passes through the middle process of Fig. (E) to the right and when the screw is loosened further, it proceeds to the first operation position (F6) of Fig. (F). When the counter screw (34) is loosened at the second operation position (d4) of Fig. (d), it passes through the middle process of Fig. (e) to the left and when the screw is loosened further, it proceeds to the second operation position (f6) of Fig. (f).

[0048] In Fig. 4, when the multi-screw (24) is loosened, the multi-screw (24) moves to the right, and the counter screw (34), which is capable of moving left and right but is prevented from rotating, moves to the left.

[0049] In Fig. 4, if the screw pitch X of the reference screw (14) is 5 mm and the screw pitch Y of the counterpart screw (34) is 6 mm, the distance moved Q is -1 mm according to the equation X - Y = Q, and at this time, the reduction ratio is 5:1. In the equation X - Y = Q, since X is smaller than Y, Q is a negative number, so the movement direction of the multiple screw (24) and the movement direction of the counterpart screw (34) are opposite.

[0050] In the first embodiment of Fig. 3, the same effect can be obtained by converting the counter screw (31) filled inside the multi-screw (21) into a nut and filling it outside the multi-screw (21).

[0051] In the first embodiment of Fig. 3, the conversion of the multi-screw (21) is illustrated in Fig. 5.

[0052] Referring to FIG. 5, the operation according to the third embodiment will be described in detail. A reference screw (12) has a female thread of a reference pitch formed inside, and a multi-screw (22) having a male thread of a reference pitch formed on one side of the outside so that it can be filled in the reference screw (12) is fastened inside the reference screw (12), and a male thread of a different pitch from the reference pitch is formed on the other side facing the part where the male thread of the reference pitch is formed, and a counter screw (32) that allows movement left and right but prevents rotation is fastened.

[0053] As shown in drawing (G) of FIG. 5, a narrow indicator (201) and a wide indicator (202) are shown to observe the change in the position of the multiple screw (22) and the relative screw (32) when the reference screw (12), the multiple screw (22), and the relative screw (32) are connected to each other. The narrow indicator (201) and the wide indicator (202) are shown only for explanation and are not included as components of the product of the present invention.

[0054] Referring to Figure 5, Figure (G) is a drawing showing when the screw is tightened to the end, and Figure (g) is a cross-sectional view extracted along the center of Figure (G).

[0055] Figure 5 (H) is a drawing showing when the screw is completely loosened, and Figure (h) is a cross-sectional view extracted along the center of Figure (H).

[0056] In the first operation position (H8) of the drawing (H) of FIG. 5, when the multi-screw (22) is completely loosened, the end face of the multi-screw (22) matches the rightmost mountain among the two mountains of the wide indicator (202), and at this time, the relative screw (32) that is allowed to move left and right but is prevented from rotating matches the rightmost mountain among the two mountains of the narrow indicator (201) as in the second operation position (h8).

[0057] When the multi-screw (22) is tightened at the 1st operation position (H8) of FIG. 5 (H), it progresses to the 1st operation position (G7) of FIG. 5. When the multi-screw (22) is tightened at the 1st operation position (H8) of FIG. 5 (H) and the 1st operation position (G7) of FIG. 5 is reached, the relative screw (32), which is allowed to move left and right but is prevented from rotating, coincides with the 2nd operation position (g7). At this time, the distance moved from the 1st operation position (H8) to the 1st operation position (G7) is five times the distance moved from the 2nd operation position (h8) to the 2nd operation position (g7). The distance moved when the multi-screw (22) rotates once is five times the distance moved by the relative screw (32). The movement distance of the counter screw (32) is five times shorter than the movement distance of the multiple screw (22).

[0058] The relationship between the distance moved by the multi-screw (22) and the distance moved by the counterpart screw (32) when the multi-screw (22) rotates once is the same as the first embodiment of Fig. 3 described above.

[0059] In Fig. 5, if the screw pitch X of the reference screw (12) is 5 mm and the screw pitch Y of the counterpart screw (32) is 4 mm, the distance moved Q is 1 mm by the formula X - Y = Q, and at this time, the reduction ratio is 5:1, and since Q is positive, the moving direction of the multiple screw (22) and the moving direction of the counterpart screw (32) are the same. In the case where Q is negative, since it is the same or similar to the contents of the second embodiment described with reference to Fig. 4, overlapping descriptions are omitted.

[0060] In the third embodiment of Fig. 5, the configuration of the reference screw (12) and the counter screw (32) fastened to the outside of the multi-screw (22) can obtain the same effect when switching between bolts and nuts.

[0061] Referring to FIGS. 5 and 6, if the multi-screw (22) is converted into a multi-screw (23), the reference screw (12) is converted into a reference screw (13), and the relative screw (32) is converted into a relative screw (33), the third embodiment of FIG. 5 can be illustrated as in FIG. 6.

[0062] Referring to FIG. 6, the operation according to the fourth embodiment is explained. A male screw of a reference pitch is formed on a reference screw (13), and a female screw of a reference pitch is formed and fastened to the right side of a multi-screw (23), and a counter screw (33) formed with a different pitch than the thread of the reference pitch of the reference screw (13) and capable of moving left and right but preventing rotation is fastened to the left side of a multi-screw (23) formed with a female screw of the same pitch as the counter screw (33).

[0063] As shown in drawing (I) of FIG. 6, a narrow indicator (301) and a wide indicator (302) are shown to observe the change in position of the multiple screw (23) and the relative screw (33) when the reference screw (13), the multiple screw (23), and the relative screw (33) are fastened. The narrow indicator (301) and the wide indicator (302) are shown only for explanation and are not included as components of the product of the present invention.

[0064] Referring to Fig. 6, Fig. (I) is a drawing showing a state in which the screw is fully loosened, Fig. (i) is a cross-sectional view taken along the center of Fig. (I), and Fig. (j) of Fig. 6 is a cross-sectional view showing a state in which the screw is fully tightened in Fig. (i).

[0065] In the first operation position (I9) of Fig. 6, when the multi-screw (23) is completely loosened, the end face of the multi-screw (23) matches the rightmost mountain among the two mountains of the wide indicator (302), and at this time, the relative screw (33) that is allowed to move left and right but is prevented from rotating matches the rightmost mountain among the two mountains of the narrow indicator (301) like the second operation position (i9).

[0066] When the multi-screw (23) is tightened at the 1st operation position (I9) of (i) of FIG. 6, it progresses to the 1st operation position (J10) of FIG. 6. When the multi-screw (23) is tightened at the 1st operation position (I9) of FIG. 6 and the 1st operation position (J10) of FIG. 6 is reached, the relative screw (33), which is allowed to move left and right but is prevented from rotating, coincides with the 2nd operation position (j10). At this time, the distance moved from the 1st operation position (I9) to the 1st operation position (J10) is five times the distance moved from the 2nd operation position (i9) to the 2nd operation position (j10). The distance moved when the multi-screw (23) rotates once is five times the distance moved by the relative screw (33). The movement distance of the counter screw (33) is five times shorter than the movement distance of the multiple screw (23).

[0067] The relationship between the distance moved by the multi-screw (23) and the distance moved by the counterpart screw (33) when the multi-screw (23) rotates once is the same as in the third embodiment of Fig. 5 described above.

[0068] In the fourth embodiment of Fig. 6, if the screw pitch X of the reference screw (13) is 5 mm and the screw pitch Y of the counterpart screw (33) is 4 mm, the distance moved Q is 1 mm by the formula X - Y = Q, and at this time, the reduction ratio is 5:1, and since Q is positive, the moving direction of the multiple screw (23) and the moving direction of the counterpart screw (33) are the same. In the case where Q is negative, since it is the same or similar to the contents of the second embodiment described with reference to Fig. 4, overlapping descriptions are omitted.

[0069] The present invention has a loosening prevention effect when tightening a bolt, a fine tightening distance per tightening rotation, allowing for precise adjustment, and a strong tightening even with a small tightening torque, thereby significantly improving practicality.

Claims

1. A standard screw (11) formed by forming a female screw or a female screw processed in a part of a product; a multi-screw (21) including a female screw formed at the center of the male screw with a pitch different from the male screw and a male screw of the same pitch formed so as to be tightened to the female screw; A screw device characterized in that a counter screw (31) having a male screw of the same pitch is inserted so that when a multiple screw (21) is tightened on the above-mentioned standard screw (11), the female screw formed at the center of the multiple screw (21) can be tightened simultaneously.

2. A standard screw (12) formed by forming a female screw or a female screw processed in a part of the product; a multi-screw (22) including a male screw formed with the same pitch on one side so as to be tightened by the female screw and a male screw formed with a different pitch on the other side where the male screw is formed; A screw device characterized in that when a multi-screw (22) is tightened on the above-mentioned reference screw (12), a counter screw (32) having a female screw of the same pitch is inserted so that it can be tightened simultaneously with a male screw formed on the other side of the multi-screw (22).

3. A standard screw (13) formed by forming a male screw or a male screw processed in a part of the product; a multi-screw (23) including a female screw formed with the same pitch on one side so that it can be tightened onto the male screw and a female screw formed with a different pitch on the other side where the female screw is formed; A screw device characterized in that when a multi-screw (23) is tightened on the above-mentioned reference screw (13), a counter screw (33) having a male screw of the same pitch is inserted so that it can be tightened simultaneously on a female screw formed on the other side of the multi-screw (23).

4. A multi-screw (21) in which a male screw is formed on the outside of the first paragraph and a female screw with a pitch different from that of the male screw is formed at the center of the male screw; A multi-screw characterized in that the external male screw and the central female screw are tightened simultaneously by tightening the above multi-screw (21).

5. A multi-screw (22) in which a male screw is formed on one side of the second paragraph and a male screw with a pitch different from that of the male screw is formed on the other side of the formed male screw; A multi-screw characterized in that the male screw on one side and the male screw on the other side are tightened simultaneously by tightening the above multi-screw (22).

6. A multi-screw (23) in which a female screw is formed on one side of the third paragraph and a female screw with a pitch different from that of the female screw is formed on the other side of the formed female screw; A multi-screw characterized in that by tightening the above multi-screw (23), the female screw on one side and the female screw on the other side are tightened simultaneously.

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