Fixing method
The method addresses the alignment issue between holes in two members by using expandable pins to correct positional deviations, ensuring secure pinning without damaging the members.
Patent Information
- Application Number
- JP2023150198
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-09-15
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2043-09-15
AI Technical Summary
When fixing two members with pins, the holes in the first member often do not align with the holes in the second member, leading to potential damage during the pinning process.
A method involving a positioning step to align holes in both members, followed by the insertion of expandable expansion pins to correct positional deviations and maintain alignment, allowing for the secure insertion of fixing pins without damaging the members.
This method effectively prevents damage to the first and second members by ensuring precise alignment and secure pinning, reducing the need for forceful insertion and minimizing potential damage.
Smart Images
Figure 2025042966000001_ABST
Abstract
Description
[Technical field]
[0001] The present disclosure relates to a method of fastening a first member and a second member with a pin. [Background technology]
[0002] In some cases, a pin is inserted into a hole in the first member and a hole in the second member to fix the first member and the second member. For example, the temporary fixing mechanism of Patent Document 1 fixes the housing and the cam plate by inserting the tip of a pin inserted into a hole formed in the housing into a hole in the cam plate arranged at a predetermined rotational position. [Prior art documents] [Patent documents]
[0003] [Patent Document 1] Japanese Patent Application Publication No. 4-151011 Summary of the Invention [Problem to be solved by the invention]
[0004] The present applicant has found the following problem. Generally, when a first member and a second member are fixed with a pin, the hole of the first member is often positioned at a position misaligned with respect to the hole of the second member. In such a case, for example, a hammer or the like is used to forcibly insert the pin into the hole of the first member and the hole of the second member. Therefore, there is a risk that the first member and the second member may be damaged.
[0005] The present disclosure has been made in consideration of such problems, and provides a fixing method that can prevent damage to a first member and a second member when fixing the first member and the second member with a pin. [Means for solving the problem]
[0006] A fixing method according to one embodiment of the present disclosure is a method for fixing a first member and a second member using a pin, the method comprising the steps of: an alignment step of aligning a plurality of holes formed in the first member with a plurality of holes formed in the second member; a first insertion step of inserting an expandable expansion pin into each of a plurality of sets of holes formed of the aligned holes of the first member and the second member; a correction step of correcting a positional misalignment between the hole of the first member and the hole of the second member by expanding the expansion pin, thereby maintaining a positional relationship between the first member and the second member; Equipped with.
[0007] The above-mentioned fixing method preferably includes a fixing step in which, when the first member and the second member have three or more holes, the expansion pin is contracted and removed from the hole set, and a second insertion step in which a fixing pin is inserted into the hole set is repeated with the expansion pin or the fixing pin inserted into other hole sets.
[0008] In the above-mentioned fixing method, it is preferable that the correction process simultaneously expands the expansion pins inserted into each of the hole pairs, and stops the expansion of the expansion pins in order, starting with the expansion pin inserted into the hole pair in which the positional misalignment between the hole of the first member and the hole of the second member has been corrected.
[0009] In the above-mentioned fixing method, it is preferable that the expansion pin is expandable in diameter.
[0010] In the above-mentioned fixing method, an outer diameter of the largest diameter portion of the expansion pin in a contracted state is smaller than a diameter of the hole of the first member and a diameter of the hole of the second member, It is preferable that the outer diameter of the largest portion of the expansion pin in the expanded state is equal to or greater than the diameter of the hole in the first member and the diameter of the hole in the second member. Effect of the Invention
[0011] According to the present disclosure, a fixing method is realized that can prevent damage to a first member and a second member when fixing the first member and the second member with a pin. [Brief description of the drawings]
[0012] [Figure 1] 10 is a diagram showing a state in which a fixing pin is inserted into a hole in a first member and a hole in a second member in a fixing step of the fixing method of the embodiment. FIG. [Diagram 2] FIG. 4 is a flow chart showing the flow of a fixing method according to an embodiment. [Diagram 3] 10 is a diagram showing a state in which a first member and a second member are arranged in a positioning step of the fixing method according to the embodiment. FIG. [Figure 4] 13A to 13C are diagrams for explaining the state in which the expansion pin inserted into the hole in the first member and the hole in the second member is expanded in the correction process of the fixing method of the embodiment. [Diagram 5] 1A and 1B are diagrams showing an example of an expansion pin used in the fixing method of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0013] Hereinafter, specific embodiments to which the present disclosure is applied will be described in detail with reference to the drawings. However, the present disclosure is not limited to the following embodiments. In addition, in order to clarify the description, the following description and drawings are appropriately simplified. Here, in the following description, in order to clarify the description, a three-dimensional (XYZ) coordinate system is used.
[0014] 1 is a diagram showing a state in which fixing pins are inserted into holes in a first member and holes in a second member in a fixing step of the fixing method of the present embodiment. The fixing method of the present embodiment is suitable, for example, when fixing a first member 1 and a second member 2 by inserting fixing pins 3 into three or more holes 1a formed in a first member 1 and three or more holes 2a formed in a second member 2 as shown in FIG.
[0015] The first member 1 is, for example, a flexible member such as a long member or a large member, and four brackets are arranged on the first member 1 at intervals in the Y-axis direction and at intervals in the X-axis direction, and each bracket has a substantially circular hole 1a formed therein so as to penetrate the bracket in the Y-axis direction.
[0016] The second member 2 is, for example, a flexible member such as a long member or a large member, and brackets are arranged at four locations on the second member 2 at intervals in the Y-axis direction and at intervals in the X-axis direction, and each bracket has a substantially circular hole 2a formed therein so as to penetrate the bracket in the Y-axis direction.
[0017] The hole 1a of the first member 1 and the hole 2a of the second member 2 each form a hole pair 4 as shown in Fig. 1, and can be arranged so that the central axes of the holes of the members overlap with each other. For example, the diameter of the hole 1a of the first member 1 and the diameter of the hole 2a of the second member 2 are approximately equal.
[0018] Fig. 2 is a flow chart showing the flow of the fixing method of the present embodiment. Fig. 3 is a diagram showing a state in which a first member and a second member are arranged in an alignment step of the fixing method of the present embodiment. Fig. 4 is a diagram for explaining a state in which an expansion pin inserted into a hole in the first member and a hole in the second member is expanded in a correction step of the fixing method of the present embodiment.
[0019] 3, the first member 1 and the second member 2 are arranged, and the hole 1a of the first member 1 and the hole 2a of the second member 2 that constitute the hole set 4 are aligned (S1). At this time, for example, if the first member 1 and the second member 2 are flexible members, misalignment between the hole 1a of the first member 1 and the hole 2a of the second member 2 is likely to occur.
[0020] Next, as shown in Fig. 4, an expansion pin 5 is inserted into each of the hole sets 4 (S2). Here, Fig. 5 is a diagram showing an example of an expansion pin used in the fixing method of the present embodiment. The expansion pin 5 may be, for example, a general expansion pin.
[0021] For example, as shown in FIG. 5, the expansion pin 5 is configured such that the cylindrical portion 5b, in which the slit 5a is formed, is passed through the shank of a bolt 5c, and the cylindrical portion 5b is positioned between the bolt head 5d of the bolt 5c and a cap nut 5e screwed onto the tip of the shank of the bolt 5c.
[0022] The expansion pin 5 is configured such that, when the bolt 5c is rotated, the inclined surface formed on the inner surface of the cylindrical portion 5b comes into contact with the inclined surface formed on the circumferential surface of the shaft portion of the bolt 5c, causing the cylindrical portion 5b to expand in diameter.
[0023] At this time, the outer diameter of the cylindrical portion 5b of the expansion pin 5 when it is in its most contracted state (i.e., when not expanded) is smaller than the diameter of the hole 1a of the first member 1 and the diameter of the hole 2a of the second member 2.
[0024] Therefore, when the positional misalignment between the hole 1a of the first member 1 and the hole 2a of the second member 2 is within a specified range, the expansion pin 5 can be easily inserted into the hole 1a of the first member 1 and the hole 2a of the second member 2, as shown in Figure 4.
[0025] On the other hand, the outer diameter of the cylindrical portion 5b of the expansion pin 5 in its most expanded state is equal to or larger than the diameter of the hole 1a of the first member 1 and the diameter of the hole 2a of the second member 2. Therefore, when the cylindrical portion 5b of the expansion pin 5 is in its expanded state, the outer circumferential surface of the cylindrical portion 5b can come into contact with substantially the entire peripheral surface of the hole 1a of the first member 1 and the peripheral surface of the hole 2a of the second member 2.
[0026] 4, the cylindrical portion 5b of the expansion pin 5 is expanded to correct the misalignment between the hole 1a of the first member 1 and the hole 2a of the second member 2 (S3). In other words, by expanding the cylindrical portion 5b of the expansion pin 5, a reaction force is applied to one member while the other member is moved, correcting the misalignment between the hole 1a of the first member 1 and the hole 2a of the second member 2, and for example, arranging the hole 1a of the first member 1 and the hole 2a of the second member 2 so that the central axes of the holes of the members are approximately aligned.
[0027] By expanding the diameter of the cylindrical portion 5b of the expansion pin 5 in this manner, it is possible to correct the misalignment between the hole 1a of the first member 1 and the hole 2a of the second member 2, thereby suppressing damage to the first member 1 and the second member 2. Furthermore, because the expansion pin 5 is configured to be expandable in diameter, it is possible to more uniformly distribute the load on the expansion pin 5, the first member 1, and the second member 2, compared to a configuration in which it is partially expanded.
[0028] At this time, the amount of misalignment between the hole 1a of the first member 1 and the hole 2a of the second member 2 differs for each hole set 4. Therefore, it is advisable to expand the cylindrical portions 5b of the expansion pins 5 inserted into each hole set 4 at approximately the same time, and stop expanding the cylindrical portions 5b in order starting from the expansion pins 5 inserted into the hole set 4 for which the misalignment between the hole 1a of the first member 1 and the hole 2a of the second member 2 has been corrected.
[0029] This makes it possible to reduce the load on the expansion pin 5, the first member 1 and the second member 2, and also to suppress bias in the positional misalignment between the hole 1a of the first member 1 and the hole 2a of the second member 2, compared to, for example, correcting the positional misalignment between the hole 1a of the first member 1 and the hole 2a of the second member 2 individually.
[0030] Next, for example, with the expanded expansion pins 5 or the fixing pins 3 inserted into three sets of holes 4, the cylindrical portion 5b of the expansion pin 5 inserted into another set of holes 4 is reduced in diameter to remove the expansion pin 5 from that set of holes 4 (S4). Then, as shown in Fig. 1, the fixing pin 3 is inserted into the set of holes 4 from which the expansion pin 5 was removed (S5).
[0031] At this time, in the three hole sets 4, the positional relationship between the first member 1 and the second member 2 is maintained in which the positional deviation between the hole 1a of the first member 1 and the hole 2a of the second member 2 has been corrected by the expanded expansion pin 5 or the fixing pin 3. Therefore, even in the hole set 4 from which the expansion pin 5 has been removed, the state in which the positional deviation between the hole 1a of the first member 1 and the hole 2a of the second member 2 has been corrected is maintained.
[0032] This allows the fixing pin 3 to be satisfactorily inserted into the hole 1a of the first member 1 and the hole 2a of the second member 2. Therefore, unlike the general practice of inserting a pin into a hole in a first member and a hole in a second member, it is not necessary to forcibly insert the fixing pin 3 using a hammer or the like, and damage to the first member 1 and the second member 2 can be suppressed.
[0033] Here, the fixing pin 3 may be, for example, a bolt having a shaft portion 3a of the fixing pin 3 with a diameter substantially equal to the diameter of the hole 1a of the first member 1 and the diameter of the hole 2a of the second member 2. However, the fixing pin 3 may have a configuration capable of fixing the first member 1 and the second member 2 together when inserted into the hole 1a of the first member 1 and the hole 2a of the second member 2.
[0034] Next, it is determined whether or not all of the expansion pins 5 have been replaced with fixed pins 3 (S6). If all of the expansion pins 5 have not been replaced with fixed pins 3 (NO in S6), the process returns to step S4. On the other hand, if all of the expansion pins 5 have been replaced with fixed pins 3 (YES in S6), the fixing of the first member 1 and the second member 2 is completed. At this time, for example, if the fixing pins 3 are constituted by bolts, the first member 1 and the second member 2 can be fixed by tightening a nut.
[0035] In this manner, the fixing method of the present embodiment can maintain the relative positions of the first member 1 and the second member 2 by correcting the positional misalignment between the hole 1a of the first member 1 and the hole 2a of the second member 2 using the expansion pin 5. In other words, since it is not necessary to use a hammer or the like to forcibly insert a pin into the hole 1a of the first member 1 and the hole 2a of the second member 2 to correct the positional misalignment between the holes of the members, damage to the first member 1 and the second member 2 can be suppressed.
[0036] In particular, even if the first member 1 and the second member 2 are flexible members and the amount of misalignment between the hole 1a of each first member 1 and the hole 2a of the second member 2 is different, the misalignment between the hole 1a of the first member 1 and the hole 2a of the second member 2 can be easily corrected.
[0037] Furthermore, in the fixing method of this embodiment, while the expanded expansion pins 5 or fixing pins 3 are inserted into the multiple hole sets 4, the expansion pins 5 inserted into the other hole sets 4 are replaced with the fixing pins 3. At this time, in the multiple hole sets 4, the positional relationship between the first member 1 and the second member 2 is maintained with the positional deviation between the hole 1a of the first member 1 and the hole 2a of the second member 2 corrected by the expanded expansion pins 5 or fixing pins 3.
[0038] Therefore, even in the hole set 4 from which the expansion pin 5 has been removed, the positional misalignment between the hole 1a of the first member 1 and the hole 2a of the second member 2 is maintained in a corrected state. This allows the fixing pin 3 to be satisfactorily inserted into the hole 1a of the first member 1 and the hole 2a of the second member 2. Therefore, it is not necessary to forcibly insert the fixing pin 3 into the hole 1a of the first member 1 and the hole 2a of the second member 2 using a hammer or the like, and damage to the first member 1 and the second member 2 can be suppressed.
[0039] Generally, a positioning pin provided on one member is inserted into a positioning hole formed in the other member to position the members relative to each other, and then a fixing pin is inserted into a fixing hole formed in one member and a fixing hole formed in the other member to fix the members relative to each other. In this case, it is cumbersome to insert each positioning pin into the positioning hole, and further, the positioning pin remains in the state where the members are fixed relative to each other, which increases the weight.
[0040] On the other hand, the fixing method of this embodiment allows the expansion pin 5 to be easily inserted into the hole 1a of the first member 1 and the hole 2a of the second member 2, making the work of fixing the members to each other simple, and since the expansion pin 5 and the fixing pin 3 are rearranged, no expansion pin 5 remains when the members are fixed to each other, thereby reducing weight.
[0041] In addition, when the cylindrical portions 5b of the expansion pins 5 inserted into each set of holes 4 are expanded substantially simultaneously and the expansion of the cylindrical portions 5b is stopped in order from the expansion pins 5 inserted into the set of holes 4 for which the positional misalignment between the holes 1a of the first member 1 and the holes 2a of the second member 2 has been corrected, the load on the expansion pins 5, the first member 1 and the second member 2 can be reduced and the bias in the positional misalignment between the holes 1a of the first member 1 and the holes 2a of the second member 2 can be suppressed compared to, for example, when the positional misalignment between each of the holes 1a of the first member 1 and the holes 2a of the second member 2 is corrected individually.
[0042] In this embodiment, the number of holes 1a in the first member 1 and the number of holes 2a in the second member 2 are four, but any number may be used. In addition, the first member 1 and the second member 2 do not need to be flexible, and there are no limitations on the shapes, hole positions, etc.
[0043] In this embodiment, the hole 1a of the first member 1 and the hole 2a of the second member 2 are arranged so that the central axes of the holes of the members are substantially overlapped, but for example, the hole 1a of the first member 1 and the hole 2a of the second member 2 may be arranged tilted with respect to the Y axis. In this embodiment, the diameter of the hole 1a of the first member 1 and the diameter of the hole 2a of the second member 2 are substantially equal, but the diameters of the holes of the members may be different, and they do not have to be circular.
[0044] In addition, in this embodiment, an expansion pin 5 configured to be expandable in diameter is used, but an expansion pin 5 configured to be partially expandable may also be used. Furthermore, the means by which the expansion pin 5 expands is not limited to the above-mentioned configuration, and may be configured to expand by, for example, an elastic body such as a spring, or air or hydraulic pressure. The expansion pin 5 can be changed as appropriate depending on the shapes of the hole 1a of the first member 1 and the hole 2a of the second member 2, etc.
[0045] In short, as long as the misalignment of the holes between the members can be corrected so that the fixing pin 3 can be inserted into the hole 1a of the first member 1 and the hole 2a of the second member 2, the shapes of the hole 1a of the first member 1 and the hole 2a of the second member 2 and the configuration of the expansion pin 5 are not limited.
[0046] In addition, in this embodiment, the expansion pin 5 and the fixing pin 3 are replaced with each other, but the first member 1 and the second member 2 may be fixed by the expansion pin 5 without replacing the expansion pin 5 with the fixing pin 3.
[0047] The present disclosure is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit and scope of the present disclosure. [Explanation of symbols]
[0048] 1 first member, 1a hole 2 second member, 2a hole 3 Fixing pin, 3a shaft 4-hole set 5 expansion pin, 5a slit, 5b cylindrical portion, 5c bolt, 5d bolt head, 5e cap nut
Claims
1. A method for fixing a first member and a second member using a pin, comprising the steps of: an alignment step of aligning a plurality of holes formed in the first member with a plurality of holes formed in the second member; a first insertion step of inserting an expandable expansion pin into each of a plurality of sets of holes formed of the aligned holes of the first member and the second member; a correction step of correcting a positional misalignment between the hole of the first member and the hole of the second member by expanding the expansion pin, thereby maintaining a positional relationship between the first member and the second member; The fixing method comprises:
2. 2. The fixing method according to claim 1, further comprising a fixing step in which, when the first member and the second member have three or more holes, the expansion pin is contracted and removed from the hole set, and a second insertion step in which a fixing pin is inserted into the hole set, the second insertion step being repeated with the expansion pin or the fixing pin inserted into other hole sets.
3. The fixing method according to claim 1 or 2, wherein the correction process simultaneously expands the expansion pins inserted into each of the hole pairs, and stops the expansion of the expansion pins in order, starting with the expansion pin inserted into the hole pair in which the positional misalignment between the hole of the first member and the hole of the second member has been corrected.
4. The fixation method according to claim 1 or 2, wherein the expansion pin is expandable.
5. an outer diameter of the largest diameter portion of the expansion pin in a contracted state is smaller than a diameter of the hole of the first member and a diameter of the hole of the second member; The fixing method according to claim 1 or 2, wherein an outer diameter of the largest diameter part of the expansion pin in the expanded state is equal to or larger than a diameter of the hole of the first member and a diameter of the hole of the second member.
Citation Information
Patent Citations
Temporary fitting mechanism
JP1992151011A
Concentric positioning temporary fixing tool
JP2019124309A
Device for aligning holes
JP2024014761A