A single-piece threaded hole center distance and position size inspection jig

Abstract

The application discloses a single-part threaded hole center distance and position size inspection jig, and relates to the field of product inspection. The single-part threaded hole center distance and position size inspection jig comprises a base and a pedestal. The pedestal is provided with a positioning assembly for positioning the placement position of a single part. The pedestal is provided with an elastic clamping assembly used in cooperation with the positioning assembly to fix the single part. A rebound assembly is arranged between the base and the pedestal to realize rebound of the pedestal. An inspection needle is arranged between the base and the pedestal to inspect the threaded hole of the single part. Through the cooperation of various assemblies, the single-part threaded hole center distance and position size detection efficiency and accuracy are improved.

Description

Technical Field

[0001] This application relates to the field of product inspection, and in particular to a fixture for inspecting the center distance and positional dimensions of threaded holes on a single part. Background Technology

[0002] In the field of mechanical manufacturing, the accuracy of the center distance of threaded holes in individual parts is crucial. Precise center distance ensures accurate alignment of components during product assembly, improves stability and reliability, and reduces assembly difficulties and loosening.

[0003] Traditionally, the machining of threaded holes in single parts is first completed by CNC machining. To meet performance requirements, subsequent processes such as heat treatment and surface treatment are also necessary. When inspecting the center distance of threaded holes in single parts, a full inspection using measuring tools is often employed. For example, vernier calipers are easy to operate and provide direct readings, while micrometers offer higher measurement accuracy. Before shipment, the center distance of the holes in each manufactured single part must be measured using these measuring tools to ensure that it meets accuracy requirements.

[0004] However, traditional processing and inspection methods have significant drawbacks. Using calipers, micrometers, and other measuring tools for full inspection is inefficient and makes it difficult to guarantee the timeliness and accuracy of the inspection. Furthermore, manual measurement is susceptible to factors such as operating techniques and the measurement environment, which can easily lead to defective products entering subsequent assembly stages, affecting product quality and production efficiency. Utility Model Content

[0005] To address the problem of low efficiency and difficulty in ensuring timeliness and accuracy when manually inspecting the center distance of holes in a single part using measuring tools, this application provides a fixture for inspecting the center distance and positional dimensions of threaded holes in a single part.

[0006] The technical solution provided in this application for a single-part threaded hole center distance and position dimension inspection fixture adopts the following: A fixture for inspecting the center distance and position dimensions of threaded holes in a single part includes a base and a pedestal. The pedestal is provided with a positioning component for positioning the single part, and an elastic clamping component that works with the positioning component to fix the single part. A springback component is provided between the base and the pedestal to enable the pedestal to spring back, and an inspection pin for inspecting the threaded holes of the single part is provided between the base and the pedestal.

[0007] By adopting the above technical solution, the elastic clamping component and the positioning component work together to fix a single part; pressing down on the base allows the inspection pin to inspect the center distance and positional dimensions of the threaded holes of the single part fixed on the base; under the action of the spring-back component, the base can spring back after being pressed, facilitating the inspection of the next single part. This solution improves the problem of low efficiency and difficulty in ensuring timeliness and accuracy of inspection when manually using measuring tools to perform full inspection of the center distance of holes in a single part.

[0008] Optionally, one end of the test needle is fixed to the base with strong adhesive, and the other end of the test needle passes through the base and presses against the base, so that the test needle and the base form a sliding fit.

[0009] By adopting the above technical solution, one end of the inspection needle is fixed to the base with strong adhesive, which can ensure the stable installation of the inspection needle on the base; the other end of the inspection needle passes through the base and slides with the base, realizing the inspection of the threaded hole of a single part.

[0010] Optionally, the elastic clamping assembly includes a fixing block, a limiting post, a first spring, a lever block, and a first bolt. The fixing block is threadedly connected to the base by the first bolt. The limiting post passes through the fixing block, and the end of the limiting post is fixed to the lever block. The first spring is sleeved on the limiting post, and both ends of the first spring are respectively fixed to the fixing block and the limiting post.

[0011] By adopting the above technical solution, when using the elastic clamping assembly, the limiting post is first pulled by the lever, which stretches the first spring. At this time, a single part can be placed in a suitable position. Then, the lever is released, and the first spring rebounds, causing the limiting post to return to its original position. This, in conjunction with the positioning assembly, fixes the single part on the base. Since the fixing block is threadedly connected to the base by the first bolt, it is convenient to install and disassemble the elastic clamping assembly.

[0012] Optionally, the rebound assembly includes a limiting screw and a second spring. A limiting groove is formed on the base, and a first mounting cavity is formed on the base. One end of the limiting screw is threaded into the first mounting cavity, and the other end of the limiting screw is set on the limiting groove. The second spring is coaxially sleeved on the limiting screw, and both ends of the second spring are respectively fixed to the base and the inner wall of the limiting groove.

[0013] By adopting the above technical solution, the rebound assembly composed of the limiting screw and the second spring can realize the rebound of the base. The limiting screw limits the movement of the base to prevent it from deviating, and the second spring provides elastic force so that the base can automatically rebound and reset after being subjected to force, which facilitates continuous inspection of single parts and improves inspection efficiency.

[0014] Optionally, the limiting groove includes a first groove and a second groove, the first groove and the second groove are coaxially arranged and connected, the end of the limiting screw is disposed in the first groove, and one end of the second spring is fixed on the inner wall of the second groove.

[0015] By adopting the above technical solution, the limiting groove includes a first groove and a second groove, which are coaxially connected. The end of the limiting screw is set in the first groove, and one end of the second spring is fixed on the inner wall of the second groove. This provides a stable installation and movement space for the rebound assembly, enabling the rebound assembly to achieve base rebound more stably.

[0016] Optionally, the positioning component includes a first limiting block and a second limiting block. Both the first limiting block and the second limiting block are fixed to the base with strong adhesive. The first limiting block and the second limiting block are used to position the end and sidewall of the single part, respectively. The first limiting block is used in conjunction with the elastic clamping component to fix both ends of the single part to the base.

[0017] By adopting the above technical solution, the first limiting block and the second limiting block accurately restrict the placement position of the single part, thereby improving the accuracy of the single part placement; the first limiting block, in conjunction with the elastic clamping assembly, fixes both ends of the single part to the base, which can stably fix the single part and prevent it from shifting during the inspection process.

[0018] Optionally, the base is further provided with a second mounting cavity, in which a positioning post is threadedly connected. The base is provided with a guide groove, and the end of the positioning post is disposed in the guide groove. When the base is pressed, the guide groove and the positioning post form a sliding fit.

[0019] By adopting the above technical solution, the positioning post can limit and guide the downward movement of the base, constrain the movement trajectory of the base, and prevent the base from shifting during pressing, thus affecting the inspection results of the threaded hole of the single part.

[0020] Optionally, the end of the test needle is integrally formed with a connecting block, the connecting block has a snap-fit ​​groove, and the base is provided with a mounting mechanism that cooperates with the snap-fit ​​groove to install the connecting block on the base.

[0021] By adopting the above technical solution, an integrally formed connecting block is set at the end of the test needle, a snap-fit ​​groove is opened in the connecting block, and an installation mechanism that cooperates with the snap-fit ​​groove is set on the base, which can realize the installation of the test needle on the base, facilitate the installation and disassembly of the test needle, and facilitate the replacement or maintenance of the test needle.

[0022] Optionally, the mounting mechanism includes a cavity, a push plate, a snap-fit ​​block, a third spring, a cover plate, and a second bolt. The cavity is formed on the base, the push plate slides inside the cavity, the snap-fit ​​block is integrally formed on the push plate, the snap-fit ​​block cooperates with the snap-fit ​​groove, the two ends of the spring are respectively fixed to the inner wall of the cavity and the push plate, the cover plate is rotatably connected to the inner wall of the cavity, and the cover plate and the push plate are fixedly connected by the second bolt.

[0023] By adopting the above technical solution, the snap-fit ​​block integrally formed on the push plate can snap into the snap-fit ​​groove on the connecting block, thereby achieving the initial connection between the connecting block and the base; then, the cover plate and the push plate are fixedly connected by the second bolt, completing the installation of the test needle and the base. For disassembly, simply loosen the bolt and reverse the operation. This installation mechanism makes the installation and disassembly of the test needle more convenient and improves the efficiency of test needle replacement.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. The positioning component is used to locate the placement position of a single part, and then the elastic clamping component is used in conjunction with the positioning component to fix the single part, which simplifies the clamping process of the single part. 2. Press down on the base so that the inspection pin fixed on the base can inspect the threaded hole of a single part fixed on the base. Compared with the traditional full inspection of measuring tools, it can improve the inspection efficiency. 3. After the test is completed, the springback assembly can make the base spring back, which facilitates the reuse of the inspection fixture and further improves the testing efficiency. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is an overall schematic diagram of the inspection fixture provided in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of the springback assembly provided in the embodiments of this application; Figure 3 This is a schematic diagram of the structure of the elastic clamping component provided in the embodiments of this application; Figure 4 This is a cross-sectional view of the base and pedestal provided in the embodiments of this application; Figure 5 This is a schematic diagram showing the location of the installation mechanism provided in the embodiments of this application; Figure 6 This is an exploded view of the installation mechanism provided in the embodiments of this application; Figure 7 This is another cross-sectional view of the base provided in the embodiment of this application, used to show the cavity.

[0027] Reference numerals: 1. Base; 2. Base plate; 3. Positioning assembly; 31. First limiting block; 32. Second limiting block; 4. Elastic clamping assembly; 41. Fixing block; 42. Limiting post; 43. First spring; 44. Pulling block; 45. First bolt; 5. Rebound assembly; 51. Limiting screw; 52. Second spring; 6. Inspection needle; 7. Limiting groove; 71. First groove; 72. Second groove; 8. First mounting cavity; 9. Second mounting cavity; 10. Positioning post; 11. Guide groove; 12. Connecting block; 13. Snap-fit ​​groove; 14. Mounting mechanism; 1401. Cavity; 1402. Push plate; 1403. Snap-fit ​​block; 1404. Third spring; 1405. Cover plate; 1406. Second bolt; 15. Single part; 16. Limiting rod. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0029] This application discloses a fixture for inspecting the center distance and position dimensions of threaded holes on a single part.

[0030] Reference Figure 1 A fixture for inspecting the center distance and position of threaded holes in a single part includes a base 1 and a base 2, with the base 2 located directly above the base 1. A positioning component 3 is provided on the top of the base 2 to restrict the placement position of the single part 15. An elastic clamping component 4 is provided on the side wall of the base 2, and the single part 15 to be inspected is fixed on the base 2 in cooperation with the positioning component 3.

[0031] Reference Figure 1 and Figure 2 An inspection pin 6 is provided on the base 1, and the other end of the inspection pin 6 passes through the base 2 and forms a sliding fit with the base 2. In this embodiment, the inspection pin 6 is fixed to the base 1 with strong adhesive. The number and position of the inspection pins 6 are determined according to the number and position of the threaded holes of the single part 15, and the size of the inspection pin 6 is also determined according to the size of the threaded holes of the single part 15. In this embodiment, there are three threaded holes on the single part 15, so three inspection pins 6 are also provided accordingly.

[0032] Reference Figure 1 and Figure 2After the single part 15 to be inspected is fixed on the base 2 by the elastic clamping assembly 4 and the positioning assembly 3, the base 2 is pressed down. If the inspection needle 6 can pass smoothly through the threaded hole on the single part 15, it means that the center distance and position of the threaded hole of the single part 15 meet the design requirements and is a qualified product; if the inspection needle 6 cannot pass smoothly through the threaded hole on the single part 15, or if there is jamming or offset, it means that the center distance and position of the threaded hole of the single part 15 have deviations and is a defective product.

[0033] Reference Figure 1 The positioning component 3 includes a first limiting block 31 and a second limiting block 32. Both the first limiting block 31 and the second limiting block 32 are fixed to the base 2 with strong adhesive. The first limiting block 31 is used to position one end of the single part 15 along its length, and the second limiting block 32 is used to position the sidewall of the single part 15. The shape of the second limiting block 32 can be designed according to the shape of the sidewall of the single part 15. In this embodiment, multiple second limiting blocks 32 are provided to position different positions of the sidewall of the single part 15.

[0034] Reference Figure 1 and Figure 3 The elastic clamping assembly 4 includes a fixed block 41, a limiting post 42, a first spring 43, and a lever 44. The fixed block 41 is threadedly connected to the base 2 by a first bolt 45, which facilitates disassembly and installation. The limiting post 42 passes through the fixed block 41 and has a smooth surface to ensure flexible sliding within the fixed block 41. The first spring 43 is sleeved on the limiting post 42, and both ends of the first spring 43 are fixed to the fixed block 41 and the limiting post 42, respectively. When the limiting post 42 moves, the first spring 43 undergoes elastic deformation, thereby generating elastic force. The end of the limiting post 42 is fixed to the lever 44, and anti-slip textures are provided on the surface of the lever 44 for easy operation by the operator.

[0035] Reference Figure 1 and Figure 3 When fixing the single part 15 to be inspected, first pull the lever 44 outward to move the limiting post 42 on the fixing block 41 and compress the first spring 43. At this time, the single part 15 can be placed in a suitable position. Then release the lever 44, and the first spring 43 rebounds, causing the limiting post 42 to return to its original position. This cooperates with the positioning component 3 to fix the single part 15 on the base 2, achieving stable clamping of the single part 15, which facilitates subsequent inspection of the center distance and positional dimensions of the threaded holes of the single part 15. When the positioning component 3 is used in conjunction with the elastic clamping component 4, the single part 15 is firmly fixed on the base 2.

[0036] Reference Figure 2 and Figure 4A spring-loaded component 5 is provided between the base 2 and the base 1. After the test is completed, the spring-loaded component 5 drives the base 2 to automatically spring back to the initial position, facilitating the next test operation. When the base 2 is pressed down for testing, the spring-loaded component 5 is compressed; after the test is completed, the spring-loaded component 5 releases its elastic potential energy, pushing the base 2 upward to return to its state before the test, thereby improving the efficiency and convenience of the test.

[0037] Reference Figure 4 A limiting groove 7 is formed on the base 2, and a first mounting cavity 8 is formed on the base 1. The limiting groove 7 includes a first groove 71 and a second groove 72, which are coaxially formed on the base 2 and connected to each other. The spring-loaded assembly 5 includes a limiting screw 51 and a second spring 52, wherein the end of the limiting screw 51 is threaded into the first mounting cavity 8, thereby fixing the limiting screw 51 to the base 1. In addition, the size of the first groove 71 is adapted to the end size of the limiting screw 51, and the end of the limiting screw 51 is disposed in the first groove 71. The second groove 72 is located directly below the first groove 71, and the two ends of the second spring 52 are respectively fixed to the inner walls of the base 1 and the second groove 72.

[0038] Reference Figure 1 and Figure 4 A second mounting cavity 9 is provided on the base 1, and a guide groove 11 is provided on the base 2. A positioning pin 10 is threadedly connected to the second mounting cavity 9, with the other end of the positioning pin 10 located within the guide groove 11. When the base 2 is pressed down, the inspection pin 6 inspects the center distance and positional dimensions of the threaded holes of the single part 15. At the same time, the guide groove 11 also forms a sliding fit with the positioning pin 10. This allows the positioning pin 10 to limit and guide the downward movement of the base 2, constraining the movement trajectory of the base 2 and thus preventing the base 2 from shifting during pressing, which would affect the inspection results of the threaded holes of the single part 15.

[0039] When downward pressure is applied to the base 2, the base 2 will overcome the elastic force of the second spring 52 and move downward, at which point the second spring 52 is in a compressed state. Simultaneously, the base 2 moves the limiting groove 7 downward, causing the limiting groove 7 to slide downward along the guide of the limiting screw 51. The single part 15 fixed on the base 2 will also move downward with the base 2, and the inspection pin 6 is used to inspect the center distance and position of the threaded holes on the single part 15. When the downward pressure is removed, the second spring 52 rebounds under the action of the restoring force, thereby causing the base 2 to rebound upward and reset, thus realizing the rebound function of the base 2 and facilitating the next inspection operation of the single part 15.

[0040] The implementation principle of the single-part threaded hole center distance and position dimension inspection fixture according to this application embodiment is as follows: The single part 15 is fixed on the base 2 by the positioning component 3 and the elastic clamping component 4 to ensure that the part will not be displaced during the inspection process. The springback component 5 allows the base 2 to spring back after being subjected to force, facilitating multiple inspection operations. The inspection needle 6 passes through the threaded hole of the single part 15 to inspect the center distance and position dimension of the threaded hole. Compared with the traditional method of manual full inspection using measuring tools, this inspection fixture greatly improves the inspection efficiency and reduces the error of manual operation.

[0041] Example 2: The difference between Example 2 and Example 1 is that: (Refer to...) Figure 5 and Figure 6 A connecting block 12 is integrally formed at the end of the test needle 6. A snap-fit ​​groove 13 is provided on the connecting block 12. A mounting mechanism 14 is provided on the base 1 to cooperate with the snap-fit ​​groove 13 to install the connecting block 12 on the base 1.

[0042] Reference Figure 6 The mounting mechanism 14 includes a cavity 1401, a push plate 1402, a snap-fit ​​block 1403, a third spring 1404, a cover plate 1405, and a second bolt 1406. The cavity 1401 is formed on the base 1, and its width is the same as the width of the snap-fit ​​block 1403. The length of the cavity 1401 is greater than the length of the connecting block 12. The push plate 1402 can slide within the cavity 1401, and its bottom is smoothed to reduce friction with the wall of the cavity 1401. The snap-fit ​​block 1403 is integrally formed on the push plate 1402 and matches the snap-fit ​​groove 13.

[0043] Reference Figure 6 and Figure 7 The two ends of the third spring 1404 are fixed to the inner wall of the cavity 1401 and the push plate 1402, respectively. The cover plate 1405 is rotatably connected to the inner wall of the cavity 1401. A round hole is provided on the cover plate 1405, and threads are tapped on the push plate 1402. The second bolt 1406 is passed through the cover plate 1405, and then the second bolt 1406 is tightened, so that the second bolt 1406 fixes the cover plate 1405 and the push plate 1402 together. A limit rod 16 is also fixed inside the cavity 1401. The limit rod 16 is coaxially arranged with the third spring 1404, and the third spring 1404 is located on the outer wall of the limit rod 16.

[0044] Reference Figures 5 to 7When installing the test needle 6, first loosen the second bolt 1406, then rotate the cover plate 1405 to open the cavity 1401, push the push plate 1402 to compress the third spring 1404, and the locking block 1403 moves accordingly, placing the end connecting block 12 of the test needle 6 into the cavity 1401. Then release the push plate 1402, and the third spring 1404 rebounds, causing the locking block 1403 to engage with the locking groove 13. Then rotate the cover plate 1405 and fix the cover plate 1405 and the push plate 1402 together with the second bolt 1406, completing the installation of the test needle 6 and the base 1. When disassembling, loosen the second bolt 1406, rotate the cover plate 1405 to open the cavity 1401, push the push plate 1402 to disengage the locking block 1403 from the locking groove 13, and then remove the test needle 6, facilitating the installation and disassembly of the test needle 6.

[0045] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fixture for inspecting the center distance and position dimensions of threaded holes on a single part, characterized in that: The device includes a base (1) and a base (2). The base (2) is provided with a positioning component (3) for positioning the placement position of a single part (15). The base (2) is provided with an elastic clamping component (4) that works with the positioning component (3) to fix the single part (15). A spring-back component (5) is provided between the base (1) and the base (2) to enable the base (2) to spring back. An inspection pin (6) is provided between the base (1) and the base (2) for inspecting the threaded hole of the single part (15).

2. The fixture for inspecting the center distance and position dimensions of threaded holes in a single part according to claim 1, characterized in that: One end of the test needle (6) is fixed to the base (1) with strong adhesive, and the other end of the test needle (6) passes through the base (2) and presses the base (2), so that the test needle (6) and the base (2) form a sliding fit.

3. The fixture for inspecting the center distance and position dimensions of threaded holes in a single part according to claim 1, characterized in that: The elastic clamping assembly (4) includes a fixing block (41), a limiting post (42), a first spring (43), a lever (44), and a first bolt (45). The fixing block (41) is threadedly connected to the base (2) by the first bolt (45). The limiting post (42) passes through the fixing block (41), and the end of the limiting post (42) is fixed to the lever (44). The first spring (43) is sleeved on the limiting post (42), and the two ends of the first spring (43) are respectively fixed to the fixing block (41) and the limiting post (42).

4. The fixture for inspecting the center distance and position dimensions of threaded holes on a single part according to claim 1, characterized in that: The rebound assembly (5) includes a limiting screw (51) and a second spring (52). A limiting groove (7) is provided on the base (2), and a first mounting cavity (8) is provided on the base (1). One end of the limiting screw (51) is threaded into the first mounting cavity (8), and the other end of the limiting screw (51) is set on the limiting groove (7). The second spring (52) is coaxially sleeved on the limiting screw (51), and both ends of the second spring (52) are respectively fixed on the inner walls of the base (1) and the limiting groove (7). When the base (2) is pressed, the limiting screw (51) and the limiting groove (7) form a sliding fit.

5. A fixture for inspecting the center distance and position dimensions of threaded holes in a single part according to claim 4, characterized in that: The limiting groove (7) includes a first groove (71) and a second groove (72). The first groove (71) and the second groove (72) are coaxially arranged and connected. The end of the limiting screw (51) is disposed in the first groove (71), and one end of the second spring (52) is fixed on the inner wall of the second groove (72).

6. A fixture for inspecting the center distance and position dimensions of threaded holes in a single part according to claim 1, characterized in that: The positioning component (3) includes a first limiting block (31) and a second limiting block (32). The first limiting block (31) and the second limiting block (32) are both fixed to the base (2) with strong adhesive. The first limiting block (31) and the second limiting block (32) are used to position the end and side wall of the single part (15) respectively. The first limiting block (31) is used in conjunction with the elastic clamping component (4) to fix both ends of the single part (15) to the base (2).

7. A fixture for inspecting the center distance and position dimensions of threaded holes in a single part according to claim 1, characterized in that: The base (1) is also provided with a second mounting cavity (9), and a positioning post (10) is threadedly connected in the second mounting cavity (9). The base (2) is provided with a guide groove (11), and the end of the positioning post (10) is set in the guide groove (11). When the base (2) is pressed, the guide groove (11) and the positioning post (10) form a sliding fit.

8. A fixture for inspecting the center distance and position dimensions of threaded holes in a single part according to claim 1, characterized in that: The end of the test needle (6) is integrally formed with a connecting block (12), and the connecting block (12) is provided with a snap-fit ​​groove (13). The base (1) is provided with a mounting mechanism (14) that works with the snap-fit ​​groove (13) to install the connecting block (12) on the base (1).

9. A fixture for inspecting the center distance and position dimensions of threaded holes in a single part according to claim 8, characterized in that: The mounting mechanism (14) includes a cavity (1401), a push plate (1402), a snap-fit ​​block (1403), a third spring (1404), a cover plate (1405), and a second bolt (1406). The cavity (1401) is opened on the base (1). The push plate (1402) slides in the cavity (1401). The snap-fit ​​block (1403) is integrally formed on the push plate (1402). The snap-fit ​​block (1403) cooperates with the snap-fit ​​groove (13). The two ends of the third spring (1404) are respectively fixed on the inner wall of the cavity (1401) and the push plate (1402). The cover plate (1405) is rotatably connected to the inner wall of the cavity (1401). The cover plate (1405) and the push plate (1402) are fixedly connected by the second bolt (1406).

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