A tool for assisting in the formation of a waist hole

Abstract

The utility model belongs to the technical field of hole making equipment, disclose a kind of auxiliary tool for making waist-shaped hole, for the hole of the foot pedal cover is processed into waist-shaped hole in auxiliary. The auxiliary tool for making waist-shaped hole includes template, positioning member and guide piece. Among them, positioning hole is opened in template, and the section of positioning hole is same with the waist-shaped hole to be processed. Positioning member includes first positioning part and second positioning part, first positioning part can be inserted in the hole, and second positioning part can be inserted in positioning hole, and first positioning part and second positioning part are used to make the normal line of positioning hole and the axis of hole collinear. Guide piece can be inserted in positioning hole, and recessed semicylindrical surface is provided on guide piece, recessed semicylindrical surface can form guide hole between any semicircular arc wall surface of positioning hole, and guide hole is used to guide drill. By using the above-mentioned auxiliary tool for making waist-shaped hole to assist drilling, the requirement to worker operation can be reduced, while ensuring the precision of manual drilling, improve drilling efficiency.

Description

Technical Field

[0001] This utility model relates to the field of hole-making equipment technology, and in particular to an auxiliary tool for making waist-shaped holes. Background Technology

[0002] An aircraft foot pedal cover is a protective device installed on the foot pedals in the aircraft cockpit. Its main function is to prevent dust, debris, small parts, etc., from entering the foot pedal mechanism, thus avoiding these foreign objects from causing the foot pedals to jam, wear, or affecting their normal transmission. To accommodate the swing space of the foot pedals, the mounting holes on the foot pedal cover are usually designed as oblong holes. By extending along the direction of foot pedal movement, the oblong holes provide sufficient space for the foot pedals to swing, avoiding interference between components and ensuring smooth operation.

[0003] In actual production, due to space constraints at the work site, it is impossible to use automatic drilling equipment to drill mounting holes in the foot pedal cover. In this case, it is necessary to drill the mounting holes manually. Manual drilling requires first drilling a pilot hole at the corresponding position on the foot pedal cover based on the existing hole position at the foot pedal. Then, the operator uses a pen-type milling cutter to extend a certain length on both sides of the pilot hole to create an oblong hole.

[0004] However, manual operation requires a high level of skill from the operator. When ordinary workers use pen-type milling cutters to expand the diameter of a round hole, they are prone to errors such as hole diameter deviation and enlargement, which can result in the hole not meeting the assembly requirements. The entire manual hole-making process is time-consuming and labor-intensive.

[0005] Therefore, there is an urgent need to design an auxiliary tool for making waist-shaped holes to solve the above problems. Utility Model Content

[0006] The purpose of this utility model is to provide an auxiliary tool for making waist-shaped holes, which can reduce the requirements for workers' operation, while ensuring the accuracy of manual drilling and improving drilling efficiency.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] An auxiliary tool for making waist-shaped holes, used to assist in processing the pilot holes on the pedal cover into waist-shaped holes, comprising:

[0009] A template, wherein a positioning hole is provided on the template, and the positioning hole has the same cross-section as the oblong hole to be processed;

[0010] The positioning component includes a first positioning part and a second positioning part. The first positioning part can be inserted into the lead hole, and the second positioning part can be inserted into the positioning hole. The first positioning part and the second positioning part are used to make the normal of the positioning hole collinear with the axis of the lead hole.

[0011] A guide member is provided, which can be inserted into the positioning hole. The guide member has a concave semi-cylindrical surface, which can form a guide hole with any half-circular arc wall of the positioning hole. The guide hole is used to guide the drill bit.

[0012] Optionally, the guide member is further provided with a support member, which can be supported on the template, and the support member is provided with a clearance structure for avoiding the guide hole.

[0013] Optionally, the projection of the support member onto the template can cover the positioning hole, and the avoidance structure is an avoidance hole.

[0014] Optionally, the clearance hole and the guide hole have the same cross-section, and part of the inner surface of the clearance hole can be connected vertically to the concave semi-cylindrical surface to form a continuous concave curved surface.

[0015] Optionally, the guide and the positioning hole are clearance fit.

[0016] Optionally, the end of the guide member inserted into the positioning hole is provided with a chamfered structure.

[0017] Optionally, an alignment line is provided on the end face of the second positioning part away from the first positioning part, and a reference line left when the pilot hole is opened is provided on the foot pedal cover, and the alignment line can be aligned with the reference line.

[0018] Optionally, the dimension of the first positioning part along the direction of insertion into the pilot hole is greater than the depth of the pilot hole, and / or, the dimension of the second positioning part along the direction of insertion into the positioning hole is less than the depth of the positioning hole.

[0019] Optionally, the first positioning part and the lead hole are in clearance fit, and the second positioning part and the positioning hole are in clearance fit.

[0020] Optionally, the end of the first positioning part inserted into the lead hole is provided with a chamfered structure, and / or the end of the second positioning part inserted into the positioning hole is provided with a chamfered structure.

[0021] The beneficial effects of this utility model are:

[0022] The auxiliary tool for making waist-shaped holes provided by this utility model uses a positioning component to position the template and a guide hole to be formed by the cooperation between the guide component and the positioning hole. This transforms the existing operation of using a pen-shaped milling cutter to extend the length of the pilot hole on both sides into a two-end drilling operation, which not only reduces the requirements for workers' operation, but also ensures the accuracy of manual drilling and improves drilling efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the auxiliary tool for making waist-shaped holes provided in this embodiment of the utility model;

[0024] Figure 2 This is a structural schematic diagram of the guide and support components provided in this embodiment of the utility model;

[0025] Figure 3 This is a schematic diagram of the guide component provided in this embodiment of the utility model being assembled on a template;

[0026] Figure 4 This is a schematic diagram of the support member provided in this embodiment of the utility model being supported on a template.

[0027] Figure 5 This is a schematic diagram of the foot pedal cover surface to be processed according to an embodiment of the present utility model;

[0028] Figure 6 This is a schematic diagram of the positioning component provided in this embodiment of the utility model being assembled on the foot pedal cover;

[0029] Figure 7 This is a schematic diagram from another perspective of the positioning component provided in this embodiment of the present invention being assembled on the pedal cover;

[0030] Figure 8 This is an assembly diagram of the positioning component, foot pedal cover, and template provided in this embodiment of the utility model;

[0031] Figure 9 This is an assembly diagram of the template, foot pedal cover, and fastener provided in this embodiment of the utility model;

[0032] Figure 10 This is an assembly diagram of the template, foot pedal cover, and fastener provided in this embodiment of the utility model from another perspective;

[0033] Figure 11 This is a schematic diagram of the guide component provided in this embodiment of the utility model installed on a template;

[0034] Figure 12 This is a schematic diagram of the guide component provided in this embodiment of the present invention installed on the template after reversal;

[0035] Figure 13 This is a schematic diagram of the waist-shaped hole after drilling is completed, provided in an embodiment of this utility model.

[0036] Figure 14 yes Figure 13 A magnified view of a portion of point A in the middle.

[0037] In the picture:

[0038] 1. Template; 11. Positioning holes;

[0039] 2. Positioning component; 21. First positioning part; 22. Second positioning part; 221. Alignment line;

[0040] 3. Guide component; 31. Concave semi-cylindrical surface;

[0041] 4. Support component; 41. Clearance hole;

[0042] 5. Guide hole;

[0043] 6. Foot pedal cover; 61. Pilot hole; 62. Baseline; 63. Waist-shaped hole;

[0044] 7. Fasteners. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0046] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0049] like Figures 1 to 14 As shown, this embodiment provides an auxiliary tool for making waist-shaped holes, used to assist in processing the pilot hole 61 on the foot pedal cover 6 into a waist-shaped hole 63. The auxiliary tool includes a template 1, a positioning component 2, and a guide component 3. The template 1 has a positioning hole 11, the cross-section of which is the same as the cross-section of the waist-shaped hole 63 to be processed. The positioning component 2 includes a first positioning part 21 and a second positioning part 22. The first positioning part 21 can be inserted into the pilot hole 61, and the second positioning part 22 can be inserted into the positioning hole 11. The first positioning part 21 and the second positioning part 22 are used to ensure that the normal of the positioning hole 11 is collinear with the axis of the pilot hole 61. The guide component 3 can be inserted into the positioning hole 11. The guide component 3 has a concave semi-cylindrical surface 31, which forms a guide hole 5 between itself and any half-circular arc wall of the positioning hole 11. The guide hole 5 is used to guide the drill bit.

[0050] This auxiliary tool for making waist-shaped holes ensures that the finished hole matches the waist-shaped hole 63 by creating a positioning hole 11 on the template 1 with the same cross-section as the hole 63 to be processed. The positioning element 2 defines the relative positional relationship between the pilot hole 61 and the positioning hole 11, ensuring that the normal of the positioning hole 11 is collinear with the axis of the pilot hole 61, thus enabling accurate machining of the structures at both ends of the waist-shaped hole 63. A guide hole 5 is formed between the guide element 3 and any half-circle end of the positioning hole 11, ensuring the accuracy of the drilling position when drilling the two ends of the waist-shaped hole 63, and enhancing the stability of the drill bit within the guide hole 5, reducing vibration. By using this auxiliary tool, the existing operation of extending the pilot hole 61 to both sides with a pen-type milling cutter is transformed into a two-end drilling operation, avoiding errors such as hole diameter deviation and enlargement. This not only reduces the demands on the operator but also ensures the accuracy of manual drilling and improves drilling efficiency.

[0051] It should be noted that the normal to the oblong hole refers to the line that passes through the center of the oblong hole's cross-section and is perpendicular to that cross-section.

[0052] Optionally, such as Figure 1 As shown, in this embodiment, template 1 is a square plate, and positioning hole 11 is opened in the middle of the square plate. The square plate has a simple structure and is easy to manufacture.

[0053] It is understood that in some other embodiments, the template 1 may also be a plate of other shapes, such as an elliptical plate, a rhomboid plate, etc., which is not limited here.

[0054] Optionally, such as Figure 1 As shown, in this embodiment, the positioning component 2 is roughly nail-shaped. The first positioning part 21 is cylindrical, and the second positioning part 22 is an oblong column. The cross-section of the oblong column is the same as the cross-section of the positioning hole 11, which facilitates the positioning of the template 1. The circular end face of the first positioning part 21 is connected to the oblong end face of the second positioning part 22, and the axis of the first positioning part 21 is collinear with the axis of the second positioning part 22, thereby ensuring that the normal of the positioning hole 11 is collinear with the axis of the pilot hole 61. The positioning component 2 has a simple structure and is easy to manufacture.

[0055] It is understood that in some other embodiments, the first positioning part 21 and the second positioning part 22 may also be structures of other shapes, such as both being cuboid structures, or one being a cylindrical structure and the other a cuboid structure, as long as the relative positional relationship between the lead hole 61 and the positioning hole 11 can be defined, and the normal of the positioning hole 11 is collinear with the axis of the lead hole 61, which is not limited here.

[0056] Alternatively, an alignment line 221 is provided on the end face of the second positioning part 22 away from the first positioning part 21, and a reference line 62 left when the guide hole 61 is opened is provided on the foot pedal cover 6, so that the alignment line 221 can be aligned with the reference line 62. By providing the alignment line 221, it is easier for the operator to position the positioning part 2, thereby improving work efficiency.

[0057] It is understood that in some other embodiments, the operator may also use other reference objects to position the positioning member 2, such as by observing whether the side of the second positioning part 22 is parallel to the side of the foot pedal cover 6, which is not limited here.

[0058] Further optional, such as Figure 7 As shown, in this embodiment, the dimension of the first positioning part 21 along the direction of insertion into the lead hole 61 is greater than the depth of the lead hole 61, and the dimension of the second positioning part 22 along the direction of insertion into the positioning hole 11 is greater than the depth of the positioning hole 11. This arrangement ensures that one end of the first positioning part 21 inserted into the lead hole 61 protrudes outside the lead hole 61, and one end of the second positioning part 22 inserted into the positioning hole 11 protrudes outside the positioning hole 11. This facilitates the operator in removing the positioning part 2 from the template 1 after positioning, thereby improving work efficiency.

[0059] It is understood that in some other embodiments, the size of the first positioning part 21 along the direction of the insertion hole 61 may be greater than the depth of the hole 61, or the size of the second positioning part 22 along the direction of the insertion positioning hole 11 may be greater than the depth of the positioning hole 11, and no limitation is made here.

[0060] Furthermore, the first positioning part 21 and the lead hole 61 are in clearance fit, and the second positioning part 22 and the positioning hole 11 are in clearance fit. This arrangement not only facilitates the insertion of the first positioning part 21 into the lead hole 61 and the second positioning part 22 into the positioning hole 11, but also makes it easier for the operator to remove the positioning part 2 from the template 1, thereby improving work efficiency.

[0061] It should be noted that the clearance fit mentioned in this embodiment refers to a clearance fit between two components where there is no relative movement.

[0062] Optionally, in this embodiment, one end of the first positioning part 21 that inserts into the lead hole 61 is provided with a chamfered structure, and one end of the second positioning part 22 that inserts into the positioning hole 11 is provided with a chamfered structure. With this configuration, when the first positioning part 21 is inserted into the lead hole 61 and the second positioning part 22 is inserted into the positioning hole 11, the chamfered structure can act as a guide, automatically correcting the positions of the first positioning part 21 and the second positioning part 22 through inclined sliding, ensuring that the insertion ends of the first positioning part 21 and the second positioning part 22 can be smoothly inserted into the hole, reducing alignment difficulties during assembly and further improving work efficiency.

[0063] It is understood that in some other embodiments, a chamfered structure may be provided only at the end of the first positioning part 21 into the lead hole 61, or only at the end of the second positioning part 22 into the positioning hole 11, and no limitation is made here.

[0064] Optionally, such as Figure 1 , Figure 2 and Figure 3As shown, in this embodiment, the guide member 3 is a columnar structure. The cross-sectional shape of the guide member 3 is a closed figure composed of two concentric semicircular arcs with different radii of curvature and two parallel straight line segments. The two semicircular arcs have the same radius as the semicircular arcs at the ends of the positioning hole 11, and the surface formed by the inwardly concave semicircular arcs is the concave semi-cylindrical surface 31. The lengths of the two parallel straight line segments are the same as the length of the straight line segment in the middle of the positioning hole 11. The guide member 3 is then inserted into the positioning hole 11. The convex semicircular arc side of the guide member 3 can fit against the semicircular arc wall at one end of the positioning hole 11, while the concave semi-cylindrical surface 31 and the semicircular arc wall at the other end of the positioning hole 11 form a guide hole 5. It can be understood that when drilling the two ends of the waist-shaped hole 63, only the direction of the guide member 3 within the positioning hole 11 needs to be adjusted, and the concave semi-cylindrical surface 31 can form guide holes 5 between the semicircular arc walls at both ends of the positioning hole 11. By forming a guide hole 5 between the concave semi-cylindrical surface 31 and the end of any semi-circular part of the positioning hole 11, the drilling accuracy can be improved when drilling both ends of the waist-shaped hole 63.

[0065] It is understood that in some other embodiments, the outwardly protruding semi-circular arc portion on the guide member 3 can also be configured with other shapes, as long as the guide member 3 can be positioned in the positioning hole 11, and the guide hole 5 is formed between the concave semi-cylindrical surface 31 and the semi-circular arc wall at the end of the positioning hole 11. No restrictions are imposed here.

[0066] Optionally, such as Figure 1 , Figure 2 and Figure 4 As shown, the guide member 3 is also provided with a support member 4, which can be supported on the template 1. The support member 4 is provided with a clearance structure to avoid the guide hole 5. By providing the support member 4, when the guide member 3 is inserted into the positioning hole 11, the support member 4 can be supported on the template 1, which not only improves the stability of the guide member 3, but also makes it easier for the operator to remove the guide member 3 from the template 1 after processing, thereby improving work efficiency. At the same time, the clearance structure on the support member 4 to avoid the guide hole 5 will not affect the drill bit's drilling through the guide hole 5.

[0067] It is understood that in some other embodiments, the guide 3 and the support 4 may also be integrally formed structures, and this is not a limitation.

[0068] Further optional, such as Figure 4As shown, the projection of the support member 4 onto the template 1 covers the positioning hole 11, and the avoidance structure is an avoidance hole 41. Specifically, in this embodiment, the support member 4 is a square plate structure, and the projection of the square plate onto the template 1 covers the positioning hole 11. To avoid the guide hole 5, an avoidance hole 41 is also provided on the square plate. By setting the projection of the support member 4 onto the template 1 to cover the positioning hole 11, the support member 4 is more stably supported on the template 1, thereby further improving the stability of the guide member 3 and ensuring drilling accuracy.

[0069] It is understood that in some other embodiments, the support member 4 can also be configured as a structure of other shapes, such as circular, elliptical, etc., and this is not limited here. It is also understood that in some other embodiments, the support member 4 can also be configured such that its projection on the template 1 does not cover the shape of the positioning hole 11, such as semi-circular, etc., and this is not limited here. It is also understood that when the support member 4 can be configured such that its projection on the template 1 does not cover the shape of the positioning hole 11, the avoidance structure can also be configured according to the actual avoidance requirements, and this is not limited here.

[0070] Further optional, such as Figure 2 and Figure 4 As shown, in this embodiment, the cross-section of the clearance hole 41 and the guide hole 5 are the same. Part of the inner surface of the clearance hole 41 can be vertically connected to the concave semi-cylindrical surface 31 to form a continuous concave curved surface. With this setting, when the guide member 3 is inserted into the positioning hole 11, the guide hole 5 can be coaxial with the clearance hole 41 and vertically connected to form a continuous cylindrical channel, which is equivalent to increasing the axial dimension of the guide hole 5, thereby further improving the stability of the drill bit in the guide hole 5 and ensuring drilling accuracy.

[0071] It is understood that in some other embodiments, when the avoidance requirement is met, the cross-section of the avoidance hole 41 and the guide hole 5 may be different. For example, the cross-section of the avoidance hole 41 may be larger than the cross-section of the guide hole 5, and the avoidance hole 41 may not be a circular hole. No restrictions are imposed here.

[0072] Furthermore, the guide 3 and the positioning hole 11 are clearance fit. This design not only facilitates the insertion of the guide 3 into the positioning hole 11, but also makes it easier for the operator to remove the guide 3 from the template 1, thereby improving work efficiency.

[0073] Alternatively, in this embodiment, one end of the guide member 3 inserted into the positioning hole 11 is provided with a chamfered structure. With this setting, when the guide member 3 is inserted into the positioning hole 11, the chamfered structure can play a guiding role, so that the insertion end of the guide member 3 can smoothly slide into the positioning hole 11, reducing the alignment difficulty during assembly and further improving work efficiency.

[0074] like Figures 5 to 14 As shown, the auxiliary tool for making waist-shaped holes provided in this embodiment is used as follows:

[0075] After drilling the pilot hole 61 on the pedal cover 6, the operator first inserts the first positioning part 21 of the positioning member 2 into the pilot hole 61 and rotates the positioning member 2 to align the alignment line 221 on the second positioning part 22 with the reference line 62 on the pedal cover 6. Then, the template 1 is pressed onto the pedal cover 6, and the second positioning part 22 is inserted into the positioning hole 11. The template 1 is then fixed onto the pedal cover 6 using the fixing member 7. After fixing, the operator removes the positioning member 2 from the template 1, inserts the guide member 3 into the positioning hole 11, and completes the drilling of one end of the waist-shaped hole 63. Then, the guide member 3 is inserted into the positioning hole 11 in the opposite direction, and the other end of the waist-shaped hole 63 is drilled. After drilling, the operator removes the positioning member 2 from the template 1 and uses a file to trim the straight hole wall of the waist-shaped hole 63 along the inner wall of the positioning hole 11, smoothing out any protrusions left after drilling. Finally, remove the fastener 7 and template 1 from the foot pedal cover 6.

[0076] Optionally, the fastener 7 used in this embodiment is a bolt cutter. Of course, it is understood that other fastening devices can also be used for the fastener 7 according to actual needs, and no restrictions are placed here.

[0077] It should be noted that pliers, files, and drilling tools are all existing technologies and will not be described in detail here.

[0078] The auxiliary tool for making waist-shaped holes provided in this embodiment ensures that the finished hole is consistent with the waist-shaped hole 63 by opening a positioning hole 11 on the template 1 with the same cross-section as the waist-shaped hole 63 to be processed. The positioning member 2 defines the relative positional relationship between the pilot hole 61 and the positioning hole 11, ensuring that the normal of the positioning hole 11 is collinear with the axis of the pilot hole 61, thereby accurately machining the structure at both ends of the waist-shaped hole 63. The guide member 3 forms a guide hole 5 between the semicircular end of the positioning hole 11, thereby ensuring the accuracy of the drilling position when drilling the two ends of the waist-shaped hole 63, and enhancing the stability of the drill bit and reducing vibration within the guide hole 5. By using the above-mentioned auxiliary tool for making waist-shaped holes, the existing operation of using a pen-type milling cutter to extend the pilot hole 61 to both sides is transformed into a two-end drilling operation, thereby avoiding operational errors such as hole diameter deviation and enlargement. This not only reduces the requirements for worker operation, but also ensures the accuracy of manual drilling and improves drilling efficiency.

[0079] Meanwhile, all components of the aforementioned waist-shaped hole-making auxiliary tool can be manufactured using 3D printing. When it is necessary to prepare waist-shaped holes 63 of different sizes, it is only necessary to modify the component parameters and reprint a set of waist-shaped hole-making auxiliary tools. The manufacturing process is convenient and the cost is low.

[0080] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An auxiliary tool for making a waist-shaped hole, used to assist in processing the guide hole (61) on the foot pedal cover (6) into a waist-shaped hole (63), characterized in that, include: Template (1), wherein a positioning hole (11) is provided on the template (1), and the positioning hole (11) has the same cross-section as the waist-shaped hole (63) to be processed; Positioning component (2), the positioning component (2) includes a first positioning part (21) and a second positioning part (22), the first positioning part (21) can be inserted into the lead hole (61), and the second positioning part (22) can be inserted into the positioning hole (11). The first positioning part (21) and the second positioning part (22) are used to make the normal of the positioning hole (11) collinear with the axis of the lead hole (61); The guide (3) can be inserted into the positioning hole (11). The guide (3) is provided with a concave semi-cylindrical surface (31). The concave semi-cylindrical surface (31) can form a guide hole (5) between itself and any half-circular arc wall of the positioning hole (11). The guide hole (5) is used to guide the drill bit.

2. The auxiliary tool for making waist-shaped holes according to claim 1, characterized in that, The guide member (3) is also provided with a support member (4), which can be supported on the template (1). The support member (4) is provided with a clearance structure, which is used to avoid the guide hole (5).

3. The auxiliary tool for making waist-shaped holes according to claim 2, characterized in that, The projection of the support member (4) on the template (1) can cover the positioning hole (11), and the avoidance structure is the avoidance hole (41).

4. The auxiliary tool for making waist-shaped holes according to claim 3, characterized in that, The clearance hole (41) has the same cross-section as the guide hole (5). Part of the inner surface of the clearance hole (41) can be connected vertically with the concave semi-cylindrical surface (31) to form a continuous concave curved surface.

5. The auxiliary tool for making waist-shaped holes according to claim 2, characterized in that, The guide (3) and the positioning hole (11) are in clearance fit.

6. The auxiliary tool for making waist-shaped holes according to claim 2, characterized in that, The guide member (3) has a chamfered structure at one end that is inserted into the positioning hole (11).

7. The auxiliary tool for making waist-shaped holes according to claim 1, characterized in that, The second positioning part (22) has an alignment line (221) on the end face away from the first positioning part (21), and the foot pedal cover (6) has a reference line (62) left when the lead hole (61) is opened. The alignment line (221) can be aligned with the reference line (62).

8. The auxiliary tool for making waist-shaped holes according to claim 1, characterized in that, The first positioning part (21) has a dimension greater than the depth of the lead hole (61) in the direction of insertion into the lead hole (61), and / or the second positioning part (22) has a dimension greater than the depth of the positioning hole (11) in the direction of insertion into the positioning hole (11).

9. The auxiliary tool for making waist-shaped holes according to claim 1, characterized in that, The first positioning part (21) and the lead hole (61) are in clearance fit, and the second positioning part (22) and the positioning hole (11) are in clearance fit.

10. The auxiliary tool for making waist-shaped holes according to claim 1, characterized in that, The first positioning part (21) has a chamfered structure at one end inserted into the lead hole (61), and / or the second positioning part (22) has a chamfered structure at one end inserted into the positioning hole (11).

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