An auxiliary installation tool for accessing a door bolt

Abstract

The application relates to the technical field of auxiliary tools, and discloses an auxiliary installation tool for approaching door bolts, which comprises a support and a push rod, the support comprises a first supporting arm and a second supporting arm, and the first supporting arm and the second supporting arm are provided with an accommodating space for accommodating the door in the thickness direction; a threaded hole extending towards the first supporting arm is arranged on the second supporting arm, the push rod is screw-fitted in the threaded hole, one end of the push rod towards the first supporting arm is a pushing end for pushing a locking washer, the pushing end is provided with a through hole, the push rod is provided with an avoiding space for avoiding the bolt on the side of the through hole close to the second supporting arm, and the through hole is provided with a hole direction which is circumferentially closed to crimp the locking washer. When the bolt is replaced, the avoiding space can avoid interference with the bolt during the movement of the push rod, meanwhile, the hole direction crimps the locking washer in the whole circumferential direction, the locking washer is uniformly pressed in the whole circumferential direction, secondary damage and pressure marks and folds are not caused, and the reliability and service life of the installation of the locking washer are improved.

Description

Technical Field

[0001] This invention relates to the field of auxiliary tool technology, and in particular to an auxiliary installation fixture for accessing door bolts. Background Technology

[0002] The approach door is a device installed on the lower air intake chamber of the APU (Auxiliary Power Unit) on the Boeing 737 131-9B aircraft. Line maintenance personnel open the approach door to conduct detailed inspections of the APU air intake.

[0003] Existing proximity gate structures such as Figure 1 and Figure 2 As shown, an installation groove 101 is provided on the access door 100. A bolt 200 and a washer are installed in the installation groove 101. The bolt 200 has a lockable structure that is thicker at the top and thinner at the bottom. The diameter of the thick end 202 of the bolt 200 is larger than the diameter of the thin end 201. The locking washer 300 can pass through the thick end 202 of the bolt 200 and enter the thin end 201 when it is not compressed. At this time, the locking washer 300 has a trumpet-shaped structure. After being compressed, the locking washer 300 is turned up and changes from a trumpet shape to a smooth shape. The locking washer 300 is radially compressed between the installation groove 101 and the thin end 201 of the bolt 200, which can lock the thin end 201 of the bolt 200, thereby achieving the purpose of locking the bolt 200.

[0004] Due to frequent inspections, the locking washers on the eight bolts installed near the door often loosen and fall off, causing the bolts to fall off as well. If a fallen bolt or washer is accidentally sucked into the APU as a foreign object, it can cause significant economic losses. The manufacturer's maintenance manual only mentions replacing the bolt "with appropriate tools," stating that the bolt should no longer loosen or fall off after replacement. Therefore, there is no standardized method for bolt replacement; existing methods include directly hammering the locking washer with a flathead screwdriver or hammering the locking washer with a socket wrench.

[0005] When replacing bolts using the above methods, improper installation techniques can easily damage tools and maintenance materials, and may also cause secondary damage to the locking washers, leading to further breakage and failure to tighten the bolts. Uneven force on the locking washers and incomplete flanging can prevent them from reaching their optimal state, making them prone to secondary detachment after use. Summary of the Invention

[0006] The purpose of this invention is to provide an auxiliary installation fixture for access door bolts, so as to solve the problem that the locking washer and aviation materials are easily damaged when replacing bolts on access doors in the prior art, and the locking washer is easy to fall off again.

[0007] To achieve the above objectives, the present invention provides an auxiliary installation fixture for a door bolt, comprising a bracket and a push rod, wherein the bracket includes a first arm and a second arm, and there is a receiving space between the first arm and the second arm for accommodating the door bolt along the thickness direction.

[0008] The second arm has a threaded hole extending toward the first arm. The push rod is threaded into the threaded hole. One end of the push rod facing the first arm is a push end for pushing the locking washer. The push end has a through hole for the bolt to pass through axially. The push rod has a clearance space for the bolt on the side of the through hole near the second arm. The through hole has a circumferentially closed edge to press the locking washer.

[0009] Preferably, the push rod includes a threaded rod and a clamping block. The threaded rod is threaded into the threaded hole, and the clamping block is detachably assembled with the threaded rod. The threaded rod has a first half-groove, and the clamping block has a second half-groove. The ends of the first half-groove and the second half-groove away from the second support arm each have a half-hole. When the clamping block is assembled with the threaded rod, the first half-groove and the second half-groove close to form the clearance space, and when the clamping block is assembled with the threaded rod, the half-hole closes to form the through hole.

[0010] Preferably, the semi-hole has an inwardly extending boss, the radius of which is greater than the radius of the thin end of the bolt and less than the radius of the thick end of the bolt.

[0011] Preferably, the threaded rod is provided with a locking block, the locking block having a slot facing the second support arm, and the clamping block is provided with a fixing lug for being inserted into the slot along the axial direction of the threaded rod.

[0012] Preferably, there are two of each of the locking blocks and the fixing ears. The two locking blocks are arranged symmetrically on both sides of the first half-groove with the center line of the threaded rod as the axis, and the two fixing ears are arranged symmetrically on both sides of the second half-groove with the center line of the clamping block as the axis.

[0013] Preferably, the push rod further includes a rotating handle, which is fixedly assembled with the threaded rod and extends radially along the threaded rod.

[0014] Preferably, the first support arm is further provided with an arc-shaped groove, which is arranged coaxially with the threaded hole, and the arc-shaped groove is used to adapt to the head surface of the bolt.

[0015] Preferably, the bracket further includes a connecting arm, which is vertically connected between the first support arm and the second support arm, and the space enclosed by the connecting arm, the first support arm and the second support arm forms the receiving space.

[0016] Compared with the prior art, the auxiliary installation fixture for access door bolts in this embodiment of the invention has the following advantages: A receiving space is formed between the first and second arms of the bracket, and the push rod is threaded into the threaded hole of the second arm. When replacing the bolt, the first and second arms of the bracket can be placed on both sides of the access door, with the access door located within the receiving space. The bolt is passed through the hole, and after the operator rotates the push rod, the push rod moves axially from the second arm to the first arm. During the movement of the push rod, the clearance space avoids interference with the bolt. Simultaneously, a locking washer is pressed against the hole along the entire circumference. The locking washer is folded and pressed between the mounting groove of the access door and the thin end of the bolt. The locking washer is evenly pressed along the entire circumference, preventing secondary damage and indentations, thus improving the reliability and service life of the locking washer installation. By controlling the tightening torque of the push rod to a specified value, the bolt can achieve the optimal locking state, making it less prone to secondary detachment. This forms a standardized bolt installation method, improving the reliability of bolt installation and maintenance quality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an existing access door structure;

[0018] Figure 2 yes Figure 1 A schematic diagram of the explosion near the door;

[0019] Figure 3 This is a schematic diagram of the auxiliary installation fixture for approaching door bolts according to the present invention;

[0020] Figure 4 yes Figure 3 A schematic diagram of the push rod used for the auxiliary installation tooling to approach the door bolt;

[0021] Figure 5 yes Figure 3 Exploded view of an auxiliary installation fixture for accessing door bolts;

[0022] Figure 6 yes Figure 4 A schematic diagram of the explosion of the push rod;

[0023] Figure 7 This is a schematic diagram of the auxiliary installation fixture for the door bolt and the assembly structure of the door.

[0024] In the diagram, 1. Bracket, 11. First arm, 12. Second arm, 13. Connecting arm, 14. Threaded hole, 15. Arc groove, 2. Push rod, 21. Through hole, 22. Nut, 3. Threaded rod, 31. First half groove, 4. Clamping block, 41. Second half groove, 5. Half hole, 6. Boss, 7. Locking block, 71. Bay opening, 8. Fixing ear, 9. Rotating handle, 100. Approach door, 101. Mounting groove, 200. Bolt, 201. Fine end, 202. Coarse end, 300. Locking washer. Detailed Implementation

[0025] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0026] A preferred embodiment of the present invention is an auxiliary mounting fixture for approaching door bolts, such as... Figures 3 to 7 As shown, the auxiliary installation fixture for accessing the door bolt includes a bracket 1 and a push rod 2. The bracket 1 is the supporting base of the auxiliary installation fixture, and the push rod 2 is assembled on the bracket 1. The push rod 2 is used to press the locking washer 300.

[0027] The bracket 1 includes a first arm 11 and a second arm 12. There is a receiving space between the first arm 11 and the second arm 12 for accommodating the access door 100 along the thickness direction, wherein the thickness direction is the depth direction of the mounting groove 101 on the access door 100. When the bolt 200 is installed, the access door 100 is located in the receiving space between the first arm 11 and the second arm 12, that is, the first arm 11 and the second arm 12 are located on both sides of the access door 100.

[0028] The second arm 12 is provided with a threaded hole 14, which penetrates the second arm 12 and extends toward the first arm 11. In this embodiment, the first arm 11 and the second arm 12 are arranged parallel to each other and spaced apart. The axis of the threaded hole 14 is perpendicular to the first arm 11 and the second arm 12. The location on the second arm 12 where the threaded hole 14 is provided is a thickened part, which can increase the structural strength at this location and ensure the depth of the threaded hole 14.

[0029] The push rod 2 is threaded into the threaded hole 14. The end of the push rod 2 facing the first support arm 11 serves as a push end for pushing the locking washer 300. When the push rod 2 rotates within the threaded hole 14, the threaded structure drives the push end to move axially, pressing against the locking washer 300 and causing it to deform. In this embodiment, a nut 22 is fixedly installed at the end of the push rod 2 furthest from the first support arm 11. The nut 22 is M22. When rotating the push rod 2, the operator can rotate the push rod 2 by turning the nut 22 with a wrench, which is convenient and effortless. In this embodiment, the diameter Ф of the threaded hole 14 on the second support arm 12 of the bracket 1 is 14mm, and the diameter of the push rod 2 is the same as the diameter of the threaded hole 14.

[0030] The push end of the push rod 2 is provided with a through hole 21, through hole 21 for the bolt 200 to pass through axially. The push rod 2 also has a clearance space for avoiding the bolt 200. The clearance space is located on the side of the through hole 21 near the second support arm 12. After the bolt 200 passes through the through hole 21, it enters the clearance space. When the push rod 2 moves axially, the clearance space can prevent the push rod 2 from interfering with the thick end 202 of the bolt 200, ensuring that the push end of the push rod 2 can press the locking washer 300.

[0031] The edge of the through hole 21 is a circumferentially closed structure, and the edge of the hole is used to press the locking washer 300. After the bolt 200 passes through the through hole 21, the edge of the through hole 21 is located outside the thin end 201 of the bolt 200, and the thick end 202 of the bolt 200 is completely inserted into the clearance space. When the push rod 2 rotates and moves axially in the hole of the bolt 200, the edge of the through hole 21 presses the locking washer 300. The locking washer 300 is deformed by folding in the mounting groove 101 near the door 100, thereby locking the bolt 200.

[0032] The auxiliary installation fixture for the access door bolt forms a receiving space between the first arm 11 and the second arm 12 of the bracket 1. The push rod 2 is threaded into the threaded hole 14 of the second arm 12. When replacing the bolt 200, the first arm 11 and the second arm 12 of the bracket 1 can be placed on both sides of the access door 100, with the access door 100 located within the receiving space. The bolt 200 is passed through the through hole 21, and after the operator rotates the push rod 2, the push rod 2 moves axially from the second arm 12 towards the first arm 11. The clearance space during the movement of the push rod 2 can avoid interference with the bolt 200. Simultaneously, the locking washer 300 is pressed against the hole along the entire circumference. The locking washer 300 is folded and pressed between the mounting groove 101 near the door 100 and the thin end 201 of the bolt 200. The locking washer 300 is evenly pressed along the entire circumference, preventing secondary damage and indentations, thus improving the reliability and service life of the locking washer 300 installation. By controlling the tightening torque of the push rod 2 to the specified value, the bolt 200 can achieve the optimal locking state, making it less likely to fall off secondary. This forms a standardized bolt 200 installation method, improving the reliability of bolt 200 installation and maintenance quality.

[0033] Preferably, the push rod 2 includes a threaded rod 3 and a clamping block 4. The threaded rod 3 is threaded into the threaded hole 14. The clamping block 4 is detachably assembled with the threaded rod 3. The threaded rod 3 has a first half-groove 31, and the clamping block 4 has a second half-groove 41. The ends of the first half-groove 31 and the second half-groove 41 that are away from the second support arm 12 each have a half-hole 5. When the clamping block 4 is assembled with the threaded rod 3, the first half-groove 31 and the second half-groove 41 close to form a clearance space. When the clamping block 4 is assembled with the threaded rod 3, the half-hole 5 closes to form a through hole 21.

[0034] The threaded rod 3 and clamping block 4 of push rod 2 are detachable and can be assembled and disassembled. The clearance space is formed by the closure of the first half groove 31 and the second half groove 41, and the through hole 21 is formed by the closure of the two half holes 5. When replacing bolt 200, clamping block 4 can be removed from threaded rod 3, and bolt 200 can be directly inserted radially between the first half groove 31, the second half groove 41 and the two half holes 5. After clamping block 4 is assembled, it can be closed to form clearance space and through hole 21, which simplifies the assembly process of bolt 200 and push rod 2.

[0035] In other embodiments, the pushing end of the push rod 2 may also be formed by a plurality of circumferentially spaced connecting rods, the ends of which are connected to each other to form a through hole 21, and the space between the connecting rods forms a clearance space.

[0036] Preferably, the half-hole 5 has an inwardly extending boss 6, the radius of which is greater than the radius of the thin end 201 of the bolt 200 and less than the radius of the thick end 202 of the bolt 200.

[0037] A boss 6 is provided on the half hole 5. The radius of the boss 6 is located between the radii of the thin end 201 and the thick end 202 of the bolt 200. This allows the edge of the half hole 5 to fit as close as possible to the thin end 201 of the bolt 200, increasing the pressing area between it and the locking washer 300. This ensures that the locking washer 300 is evenly stressed on the entire surface, preventing secondary damage to the locking washer 300 and avoiding indentations or creases.

[0038] In this embodiment, the inner diameter of the boss 6 is slightly larger than the inner diameter of the thin end 201 of the bolt 200, the inner diameter of the first half groove 31 and the second half groove 41 is slightly larger than the outer diameter of the thick end 202, and the outer diameter of the threaded rod 3 and the clamping block 4 after closing is slightly smaller than the inner diameter of the mounting groove 101 near the door 100, so as to ensure the pressing and locking of the gasket 300.

[0039] Preferably, the threaded rod 3 is provided with a locking block 7, the locking block 7 having a locking slot 71 facing the second support arm 12, and the clamping block 4 is provided with a fixing ear 8, which is used to be inserted into the locking slot 71 along the axial direction of the threaded rod 3.

[0040] When the clamping block 4 is assembled with the threaded rod 3, the clamping block 4 moves axially and the fixing ear 8 is embedded in the slot 71 of the clamping block 7. The clamping block 7 can limit the clamping block 4 axially and prevent rotation in the circumferential direction through the fixing ear 8. When the threaded rod 3 rotates, the clamping block 4 is pushed to rotate synchronously and move axially by the clamping block 7 to ensure that the hole edge of the through hole 21 is pressed and locked with the locking washer 300.

[0041] Preferably, there are two locking blocks 7 and two fixing ears 8. The two locking blocks 7 are arranged symmetrically on both sides of the first half-groove 31 with the center line of the threaded rod 3 as the axis, and the two fixing ears 8 are arranged symmetrically on both sides of the second half-groove 41 with the center line of the clamping block 4 as the axis.

[0042] There are two locking blocks 7 and two fixing ears 8. The two locking blocks 7 and the two fixing ears 8 correspond one-to-one and are symmetrically distributed, which can ensure that the threaded rod 3 and the clamping block 4 are subjected to uniform force and move smoothly.

[0043] Preferably, the push rod 2 further includes a rotating handle 9, which is fixedly assembled with the threaded rod 3 and extends radially along the threaded rod 3.

[0044] The rotating handle 9 makes it easier for operators to rotate the push rod 2, and the replacement of the bolt 200 is also easier. In this embodiment, the length of the rotating rod is 80mm and the outer diameter Ф is 6mm. A radial hole with a diameter Ф of 6mm is opened on the push rod 2 to assemble the rotating handle 9.

[0045] Preferably, the first arm 11 is also provided with an arc-shaped groove 15, which is coaxially arranged with the threaded hole 14. The arc-shaped groove 15 is used to adapt to the curved surface of the head of the bolt 200.

[0046] The head of the bolt 200 has a curved surface structure, and an arc-shaped groove 15 coaxial with the threaded hole 14 is provided on the first support arm 11. The curved surface of the bolt 200 head fits into the arc-shaped groove 15 on the first support arm 11, and the bolt 200 and the first support arm 11 are in surface contact, ensuring the stability of the bolt 200 during the replacement process.

[0047] Preferably, the bracket 1 further includes a connecting arm 13, which is vertically connected between the first arm 11 and the second arm 12, and the space enclosed by the connecting arm 13, the first arm 11 and the second arm 12 forms an accommodating space.

[0048] The connecting arm 13, the first arm 11, and the second arm 12 of the support 1 form a U-shape, which simplifies the specific structure of the support 1 and makes it easier for operators to carry and work with it.

[0049] The working process of this invention is as follows: The operator sets the bolt 200 and locking washer 300 on the access door 100, and the bracket 1 of the auxiliary installation fixture is set on the access door 100. The first arm 11 and the second arm 12 are located on both sides of the access door 100. The bolt 200 is embedded in the first half groove 31 of the threaded rod 3. Then, the clamping block 4 is moved axially and assembled with the threaded rod 3. The fixing ear 8 of the clamping block 4 is embedded in the locking block 7 of the threaded rod 3, completing the installation and cooperation between the fixture and the access door 100. Then, the push rod 2 is rotated, and the threaded rod 3 and the clamping block 4 move synchronously. The locking washer 300 is pressed against the hole of the through hole 21 and gradually flattened. By adjusting the tightening torque of the push rod 2 to the specified value, the locking washer 300 firmly locks the bolt 200. The operator then rotates the push rod 2 in the opposite direction and removes the clamping block 4, and then the entire auxiliary installation fixture can be removed from the access door 100 to complete the replacement of the bolt 200.

[0050] In summary, this invention provides an auxiliary installation fixture for access door bolts. A receiving space is formed between the first and second arms of the bracket, and a push rod is threaded into the threaded hole of the second arm. When replacing bolts, the first and second arms of the bracket can be placed on either side of the access door, with the access door located within the receiving space. The bolt is passed through the hole, and the operator rotates the push rod, causing it to move axially from the second arm towards the first arm. The clearance space during the push rod's movement prevents interference with the bolt. Simultaneously, a locking washer is pressed against the hole along the entire circumference. The locking washer is flanged and pressed between the mounting groove of the access door and the thin end of the bolt. The locking washer is evenly compressed along the entire circumference, preventing secondary damage and indentations, thus improving the reliability and service life of the locking washer installation. By controlling the tightening torque of the push rod to a specified value, the bolt can achieve an optimal locking state, reducing the likelihood of secondary detachment. This forms a standardized bolt installation method, improving the reliability of bolt installation and maintenance quality.

[0051] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. An auxiliary mounting fixture for accessing door bolts, characterized in that, Includes a bracket (1) and a push rod (2), the bracket (1) including a first arm (11) and a second arm (12), and there is a receiving space between the first arm (11) and the second arm (12) for receiving an approach door (100) in the thickness direction; The second support arm (12) is provided with a threaded hole (14) extending toward the first support arm (11), and the push rod (2) is threadedly fitted into the threaded hole (14). One end of the push rod (2) facing the first support arm (11) is a push end for pushing the locking washer (300). The push end is provided with a through hole (21) for the bolt (200) to pass through axially. The push rod (2) has a clearance space for the bolt (200) on the side of the through hole (21) near the second support arm (12). The through hole (21) has a circumferentially closed edge to press the locking washer (300). The push rod (2) includes a threaded rod (3) and a clamping block (4). The threaded rod (3) is threaded into the threaded hole (14). The clamping block (4) is detachably assembled with the threaded rod (3). The threaded rod (3) has a first half-groove (31), and the clamping block (4) has a second half-groove (41). The ends of the first half-groove (31) and the second half-groove (41) away from the second support arm (12) each have a half-hole (5). When the clamping block (4) is assembled with the threaded rod (3), the first half-groove (31) and the second half-groove (41) close to form the clearance space. When the clamping block (4) is assembled with the threaded rod (3), the half-hole (5) closes to form the through hole (21). The half-hole (5) has an inwardly extending boss (6) with a radius greater than that of the thin end (201) of the bolt (200) and less than that of the thick end (202) of the bolt (200).

2. The auxiliary mounting fixture for approaching door bolts according to claim 1, characterized in that, The threaded rod (3) is provided with a locking block (7), the locking block (7) has a slot (71) facing the second arm (12), and the clamping block (4) is provided with a fixing ear (8), the fixing ear (8) is used to be inserted into the slot (71) along the axial direction of the threaded rod (3).

3. The auxiliary mounting fixture for approaching door bolts according to claim 2, characterized in that, Both the locking block (7) and the fixing ear (8) are two in number. The two locking blocks (7) are arranged symmetrically on both sides of the first half-groove (31) with the center line of the threaded rod (3) as the axis, and the two fixing ears (8) are arranged symmetrically on both sides of the second half-groove (41) with the center line of the clamping block (4) as the axis.

4. The auxiliary mounting fixture for approaching door bolts according to claim 1, characterized in that, The push rod (2) also includes a rotating handle (9), which is fixedly assembled with the threaded rod (3) and extends radially along the threaded rod (3).

5. The auxiliary mounting fixture for accessing door bolts according to any one of claims 1-4, characterized in that, The first arm (11) is also provided with an arc-shaped groove (15), which is coaxially arranged with the threaded hole (14) and is used to adapt to the head surface of the bolt (200).

6. The auxiliary mounting fixture for accessing door bolts according to any one of claims 1-4, characterized in that, The bracket (1) also includes a connecting arm (13), which is vertically connected between the first support arm (11) and the second support arm (12). The space enclosed by the connecting arm (13), the first support arm (11) and the second support arm (12) forms the accommodating space.

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