Pole for a lateral stabilization aerial ladder

Abstract

The present invention relates to a boom for a lateral reinforcement type aerial ladder truck, which comprises a main boom (11) rotatably provided on a vehicle (10) and multi-stage telescopically extended, and auxiliary booms (13) each multi-stage telescopically coupled to lateral sides of the main boom (11), whereby the main boom can be reinforced from both sides by the auxiliary booms to further improve the overall bending stiffness and lateral load bearing strength of the boom. Further, it comprises an extension ladder movably fitted to the lower end of the main boom and extended to the ground when the aerial ladder truck is operated to lower the truck bed to the ground, whereby the extension ladder is movably fitted to the upper side of the lower end of the main boom having the auxiliary booms coupled to the lateral sides thereof and extended to the ground, so that the truck bed moved with the boom by the extension ladder is lowered to the ground to easily load and unload the truck bed.

Description

Technical Field

[0001] This invention relates to a boom for a laterally reinforced aerial ladder truck, and more specifically, to a boom for a laterally reinforced aerial ladder truck characterized by having an auxiliary boom mounted on the side of the main boom, thereby significantly improving the bending load-bearing strength, the yield strength of local load-bearing due to local load trolley, and the lateral load-bearing strength due to lateral compression. Background Technology

[0002] Typically, aerial ladder trucks have multi-position telescopic booms to facilitate the transport of trolleys and other equipment from the ground to higher ground. The boom determines the transport height, and its performance depends on the strength of the boom.

[0003] One example of the boom used for the aerial ladder truck is... Figure 1 The boom of the aerial ladder truck is shown (Korean Patent Registration No. 10-1763649). As shown, the boom 110 is rotatably mounted on the vehicle 101, and the lifting angle is determined by an angle adjustment cylinder 104. Thus, when the boom 110 extends upward, the trolley 120 is moved to the target position for a given purpose.

[0004] However, due to the structural limitations caused by the need for extension and retraction, the conventional boom 110 has folds between the booms. In particular, each boom has an upward-opening structure on its cross-section to facilitate the movement of the trolley 120 while folding. Therefore, its disadvantage is that the bending stiffness becomes weak.

[0005] Furthermore, the outer boom does not fold on the outside. Although this is sufficient to strengthen the outside, the other booms cannot have any external reinforcement to maintain the fold. In particular, not only can they not be reinforced, but the load-bearing pressure on the bottom boom, that is, the second boom located below the outer boom, will increase. Therefore, its disadvantage is that it becomes the weakest in terms of strength.

[0006] Furthermore, although the strength of the boom itself can be increased, the increased weight amplifies the aforementioned vulnerabilities. When extended to a height, it is subjected to lateral loads due to impacts from external forces, such as side winds or swaying. Therefore, its drawback is that it cannot prevent bending or turning to the side or being twisted.

[0007] Furthermore, although the aforementioned traditional boom 110 can improve the strength of the boom itself, the increased weight amplifies the aforementioned vulnerabilities. When extended to a height, it is subjected to lateral load due to impacts from external forces, such as side winds or swaying. Therefore, its drawback is that it cannot prevent bending or turning to the side or being twisted.

[0008] In addition, the boom of the aerial ladder truck needs to be equipped with an extension ladder to facilitate lowering the trolley to near the ground; one example is... Figure 1 The Korean Utility Model Publication No. 20-1994-0022909, "Connecting Device for an Extension Ladder," shows that a connecting member 204 is provided at the rear end of the ladder section 203, and the connecting member 204 is connected to the extension ladder 202 to facilitate connection with the ladder section 203, thereby allowing the trolley 205 to move from the ladder section 203 to the extension ladder 202 and descend to a position close to the ground.

[0009] However, when the aforementioned conventional extension ladder 202 is applied to a ladder truck, it connects directly to the end of the ladder section 203, remaining constantly exposed. Even when not using the ladder truck, it protrudes from the rear of the ladder section 203, occupying a considerable amount of space behind the ladder truck. Therefore, its drawback is that when the ladder truck is running or stopped without folding the ladder section, there is not enough time to recognize the space occupied by the extension ladder, leading to accidents.

[0010] Therefore, a structure is needed to accommodate the extension ladder when it is not in use. The extension ladder must be connected to the outer hanger to facilitate connection with the outermost outer hanger of the main hanger. Furthermore, as mentioned above, in structures that reinforce the main hanger with reinforcing hangers, especially in structures that provide reinforcing hangers on the side of the main hanger to maximize load distribution, the disadvantage is that since the auxiliary hanger is located on the side of the main hanger, it is difficult to position the connection point for accommodating the extension ladder on the side of the outer hanger. Summary of the Invention

[0011] Technical issues

[0012] To address the shortcomings of traditional ladder truck booms, the present invention aims to enhance the bending load-bearing capacity of the boom by reinforcing the sides of the main boom with auxiliary booms. In particular, it increases the load-bearing capacity at the front end in the extended state and the overall bending load-bearing capacity due to its own weight, while simultaneously multiplying the rigidity of the boom and reducing its own weight.

[0013] Furthermore, another objective of the present invention is to improve the strength of the suspension rod relative to lateral load-bearing.

[0014] Furthermore, another objective of the present invention is to distribute the local load applied to the main boom by the trolley to the auxiliary boom, thereby increasing the local yield strength of the main boom.

[0015] Furthermore, in order to overcome the drawbacks of the ladder truck booms with conventional extension ladders, another objective of the present invention is to provide a ladder truck boom with an extension ladder, which has a main boom with a side-strengthening auxiliary boom, and can also be used with an extension ladder movable relative to the main boom.

[0016] Furthermore, another objective of the present invention is to provide a boom for a ladder truck equipped with an extension ladder, which, when the trolley is moved using the extension ladder, does not detach to the side while the trolley is resting on the extension ladder.

[0017] Furthermore, another objective of the present invention is to provide a boom for a ladder truck equipped with an extension ladder, which can be securely connected to the main boom when the auxiliary boom is located on the side of the main boom.

[0018] Technical solution

[0019] To achieve the above objectives, the present invention provides a boom for a laterally reinforced aerial ladder truck, comprising: a main boom rotatably mounted on the vehicle and capable of multi-stage telescopic extension; and auxiliary booms, which are telescopically attached to the two lateral sides of the main boom in multiple stages.

[0020] Furthermore, preferably, the auxiliary suspension rod includes: a plurality of auxiliary suspension rods folded together with decreasing cross-sectional areas; and a plurality of brackets that protrude laterally and are attached to the side of the front end of each of the main suspension rods to support the front end portion of the corresponding auxiliary suspension rod.

[0021] Furthermore, preferably, in the main boom, the auxiliary outer boom corresponding to the outer boom connected to the vehicle is attached to both sides of the outer boom.

[0022] Furthermore, preferably, the plurality of auxiliary rods each have a circular or elliptical cross-section.

[0023] Furthermore, preferably, each of the plurality of auxiliary rods has a polygonal cross-section.

[0024] Furthermore, preferably, it includes: an extension ladder, which is mounted on the lower end of the main boom and moves relative to it, extending to the ground when the ladder truck is started, thereby lowering the trolley of the ladder truck to the ground.

[0025] Furthermore, preferably, the extension ladder is guided by a fastening strap to facilitate movement with the main suspension rod and is supported above the outermost outer suspension rod located among the suspension rods, the fastening strap being attached to the outermost auxiliary suspension rod located among the plurality of auxiliary suspension rods.

[0026] Furthermore, preferably, the fastening strap has a roller portion to facilitate guiding the extension ladder during sliding. When the extension ladder is retracted along the upper direction of the main boom, the roller of the roller portion engages with the groove formed in the extension ladder to secure it.

[0027] Furthermore, preferably, the fastening band has a fastening portion that applies pressure to the roller portion along the direction of the groove portion when the extension ladder is retracted along the upper direction of the main lifting rod, so as to fix the roller in the groove portion.

[0028] Furthermore, preferably, the extension ladder includes: a pair of rolling plates extending along the length direction to support the wheels of the trolley; and an anti-detachment protrusion protruding upward along the outer edge of the rolling plates to prevent the wheels rolling on the rolling plates from detaching from the outer side of the rolling plates.

[0029] Furthermore, preferably, the extension ladder includes a guide boss integrally formed on the outer side of the anti-detachment boss to facilitate insertion into a guide groove to guide movement with the main suspension rod. The guide groove is formed between the upper portion of the outer side wall of the outer suspension rod, which forms a step difference based on the height difference between the outermost outer suspension rod and the auxiliary suspension rod, and the lower portion of the inner side wall of the fastening band.

[0030] Beneficial effects

[0031] The boom of the horizontally reinforced aerial ladder truck described in this invention can strengthen both sides of the upwardly open main boom by using an auxiliary boom with a closed cross-section. Therefore, the overall bending stiffness of the boom can be further improved. In particular, the load-bearing capacity of the front end in the extended state and the overall bending load-bearing strength due to its own weight can be further improved.

[0032] Furthermore, the overall strength of the boom can be improved, and even if the thickness of the main boom is reduced, the increase in weight can be avoided by the boom itself or by reinforcing structures. Therefore, the decrease in strength due to the increase in weight can be avoided.

[0033] Furthermore, by continuously arranging auxiliary rods on the side of the main rod and extending the rods to a higher position, even if subjected to lateral pressure due to wind, the main rods and auxiliary rods can still resist bending along the lateral direction of the load-bearing work. Therefore, compared to placing the auxiliary rods below the main rods, the strength relative to the lateral load-bearing capacity can be significantly improved.

[0034] Furthermore, even if the trolley causes localized load on the main boom, the load can be shared between the main boom and the auxiliary boom, thus significantly improving the local yield strength of the main boom.

[0035] Furthermore, an extension ladder is attached to the lower end of the main lifting rod, which is reinforced with auxiliary lifting rods on both sides. This allows the trolley, which moves with the main lifting rod via the extension ladder, to descend to near the ground, making it easy to load and unload goods from the trolley.

[0036] Furthermore, an anti-detachment protrusion is formed by protruding upwards along the outer edge of the extension ladder, which prevents the wheels of the trolley from falling off to the side from the extension ladder. Therefore, the trolley can be used safely even if it is located on the extension ladder.

[0037] Furthermore, a fastening band that can be relatively movable and clamped into the extension ladder is attached to the upper part of the auxiliary hanger. The height difference between the fastening band and the main hanger forms a guide groove. The guide boss formed on the outer side of the extension ladder is inserted into the guide groove for guidance, so that the extension ladder is firmly attached to the fastening band and the guide groove. Thus, through the combination structure of the main hanger and the auxiliary hanger and the fastening band, a solid connection structure of the extension ladder that can be relatively movable is formed on the main hanger.

[0038] Furthermore, rollers are formed on the fastening band that guides the extension ladder to move, allowing the extension ladder to slide through the rollers. At the same time, when the extension ladder is stored, pressure is applied to the rollers through the fastening part, causing them to engage with the groove of the extension ladder to achieve fixation. Therefore, the extension ladder can be guided and fixed through the roller structure, achieving relative movement and fixation of the extension ladder in a simple configuration. Attached Figure Description

[0039] Figure 1 The boom used in conventional technology for aerial ladder trucks is shown;

[0040] Figure 2 It is a perspective view of the suspension rods of a traditional extension ladder;

[0041] Figure 3 This is a perspective view of applying a boom for a laterally reinforced aerial ladder truck to a vehicle according to an embodiment of the present invention;

[0042] Figure 4 yes Figure 3 A perspective view of the extended state of the boom shown;

[0043] Figure 5 yes Figure 3 Perspective view of the boom shown;

[0044] Figure 6 yes Figure 5 Enlarged view of section A;

[0045] Figure 7 yes Figure 5 An exploded perspective view of any of the main suspension rods and its corresponding auxiliary suspension rods and brackets;

[0046] Figure 8 yes Figure 5 Cross-sectional perspective view of section B;

[0047] Figure 9 yes Figure 3 The bottom view of the boom shown;

[0048] Figure 10 This is a perspective view of a ladder truck boom with an extension ladder according to an embodiment of the present invention;

[0049] Figure 11 yes Figure 10 Perspective view of the central suspension rod and extension ladder in the extended position;

[0050] Figure 12 This is a perspective view of the main suspension rod, auxiliary suspension rod, and extension ladder of a ladder truck with an extension ladder according to an embodiment of the present invention.

[0051] Figure 13 This is an enlarged perspective view of the combined structure of the main suspension rod and the auxiliary suspension rod in a ladder truck with an extension ladder, according to an embodiment of the present invention.

[0052] Figure 14 yes Figure 12 Perspective view of the extended staircase in its extended state;

[0053] Figure 15 This is a front view along the length of the main suspension rod, auxiliary suspension rod, and extension ladder of a ladder truck with an extension ladder, as viewed from the length direction according to an embodiment of the present invention.

[0054] Figure 16 It is magnification Figure 15 A magnified view of part A in the middle;

[0055] Figure 17 This is an exploded view of the fastening strap of the boom of a ladder truck equipped with an extension ladder, according to an embodiment of the present invention. Detailed Implementation

[0056] Hereinafter, with reference to the accompanying drawings, a boom for a laterally reinforced aerial ladder truck according to an embodiment of the present invention will be described in detail.

[0057] like Figure 3 and Figure 4 As indicated by symbol 1, the boom of this invention is part of a vehicle, i.e., a ladder truck, and is retractably extended and mounted on vehicle 10, as shown in Figure 1. Figure 3 As shown, it is folded during transport and extended upwards during use, allowing the trolley 3 to rise and fall from the lower end to the upper end connected to the vehicle 10.

[0058] Therefore, such as Figures 3 to 9 As shown, the boom 1 of the present invention includes a main boom 11 and an auxiliary boom 13.

[0059] Among them, such as Figure 3 and Figure 4As shown, the main suspension rod 11 serves as the body of the suspension rod 1. Its lower end is rotatably provided on the vehicle 10 and is composed of a plurality of suspension rods (21, 22, 23, 24, 25, 26) so as to extend in multiple gears telescopically.

[0060] At this time, as Figure 8 and Figure 9 shown, each suspension rod (21, 22, 23, 24, 25, 26) is composed of left and right frame bodies of a rectangular frame body that is opened up and down through an opening part 31, that is, a rectangular frame body with a 'C'-shaped cross-section. In order to reduce the weight, a plurality of cross bars 12 are attached to the lower opening part 31 to strengthen the strength.

[0061] The auxiliary suspension rod 13 is a means for laterally strengthening the main suspension rod 11 at both side ends of the main suspension rod 11. As Figures 5 to 9 shown, it can be telescopically extended in multiple gears and is combined in pairs on the left and right sides of the main suspension rod 11 transversely, and each has an independent folding structure.

[0062] For this reason, as Figures 5 to 9 shown, the auxiliary suspension rod 13 includes a plurality of auxiliary suspension rods (41, 42, 43, 44, 45) and a plurality of brackets (51, 52, 53, 54, 55). As Figure 6 and Figure 8 shown, each of the auxiliary suspension rods (41, 42, 43, 44, 45) is a cylinder with a cross-section of a polygon such as a quadrilateral, or a circle, an ellipse, or a racetrack shape. A plurality of them are telescopically overlapped along the length direction and have a folding structure that is convenient for folding with the cross-sectional area gradually decreasing from bottom to top. However, Figure 5 , Figure 8 and Figure 9 in, the structure of wrapping the outer suspension rod 21 and the auxiliary suspension rod 41 shown by the symbol 15 is an extension ladder, which extends from the in-use suspension rod 1 towards the ground direction, lowers the trolley to the ground, and makes it easier to load and unload goods.

[0063] In particular, on the cross-section of each auxiliary suspension rod (41, 42, 43, 44, 45), instead of forming an open part, the above-mentioned various cross-sectional shapes are formed. As Figure 8 shown, when considering the second moment of the cross-section with respect to the cross-sectional area, preferably, it has a rectangular tube-shaped cross-section with a long longitudinal direction and a short transverse direction.

[0064] The brackets (51, 52, 53, 54, 55) are means for supporting the front end, that is, the upper end of the corresponding auxiliary suspension rods (41, 42, 43, 44, 45). As Figure 6As shown, the brackets protrude laterally and are attached to the front sides of the corresponding hangers (21, 22, 23, 24, 25, 26), respectively, in the following ways: the first bracket 51 is attached to the side of the lower end of the outer hanger 21 connected to the vehicle 10 in the hanger 1, and the fifth bracket 55 is attached to the fifth hanger 25. Thus, each bracket (51, 52, 53, 54, 55) supports the front ends of the corresponding auxiliary hangers (41, 42, 43, 44, 45) by the first bracket 51 supporting the auxiliary outer hanger 41 and the fifth bracket 55 supporting the fifth auxiliary hanger 45. Therefore, as... Figure 6 and Figure 7 As shown, each bracket (51, 52, 53, 54, 55) forms a through hole 57 at the top, into which the front ends of the auxiliary hangers (41, 42, 43, 44, 45) are inserted and supported. Specifically, the auxiliary outer hangers 41 corresponding to the outer hanger 21 are all fitted against both sides of the outer hanger 21, thereby increasing the support strength of the auxiliary hanger 13. At this time, each bracket (51, 52, 53, 54, 55) is a hollow thick plate, but, as... Figure 7 As shown, a through groove 59 is cut in the middle part of the side corner so that when the lateral adjusting bolt 61 used to adjust the lateral displacement of each rod (21, 22, 23, 24, 25, 26) is rotated through the adjusting hole 58, the nut 62 can be fixed from the outside.

[0065] The following describes the function of the boom 1 used in the laterally reinforced aerial ladder truck in a preferred embodiment of the present invention.

[0066] like Figure 3 and Figure 5 As shown, the lifting rod 1 of the present invention can be folded and stored when not in use, but when in use, as... Figure 4 As shown, it can be extended so that the wheel 17 at the front end of the boom 1 reaches the target position.

[0067] When extended in this way, the main hanger 11 resists bending stress, and the auxiliary hanger 13 also resists bending stress, which can significantly improve the bending stiffness. Therefore, it is not necessary to strengthen the main hanger 11, the setting of reinforcing structures can be omitted, and the weight of the load-bearing work can also be reduced. In particular, the auxiliary hanger 13, due to its small cross-sectional area and rectangular cross-section that does not form an open part, can significantly increase the second moment of the section relative to the cross-sectional area, thus significantly improving the bending stiffness.

[0068] Furthermore, the auxiliary boom 13 is arranged side by side with the main boom 11 along the transverse direction, which can share the local load generated when the trolley 3 passes by, thus reducing the load pressure on the main boom 11. Therefore, the reinforcing structure for the main boom 11 can be further removed, which facilitates the reduction of the thickness and weight of the main boom 11 itself.

[0069] Meanwhile, for the load-bearing work done laterally on the main hanger 11, the auxiliary hanger 13 is arranged in the same row as the main hanger 11 along the direction of the load-bearing work. Therefore, compared with arranging the auxiliary hanger 13 below the main hanger 11, the strength of the lateral load-bearing caused by wind or external force can be greatly improved.

[0070] In addition, another embodiment of the present invention is described in detail below, which includes a boom for a laterally reinforced aerial ladder truck with an extension ladder.

[0071] like Figure 10 As indicated by symbol 1, the boom described in this invention is a retractable extension mounted on vehicle 10, which is part of the vehicle, i.e., the ladder truck. Figure 10 As shown, it is folded during transport and extended upwards during use, allowing the trolley 3 to rise and fall from the lower end to the upper end connected to the vehicle 10.

[0072] Therefore, such as Figures 10 to 14 As shown, the suspension rod 1 of the present invention includes a main suspension rod 11, an auxiliary suspension rod 13, and an extension ladder 15.

[0073] like Figure 10 and Figure 11 As shown, the main boom 11 serves as the body of the boom 1, with its lower end rotatably mounted on the vehicle 10. It is composed of multiple booms (21, 22, 23, 24, 25, 26) to allow for multi-level telescopic extension.

[0074] At this time, as Figure 13 As shown, each of the lifting rods (21, 22, 23, 24, 25, 26) is composed of a rectangular frame and is located on both sides of the lifting rod 1. In order to reduce weight, multiple crossbars are attached between the lifting rods (21, 22, 23, 24, 25, 26) on both sides to enhance strength.

[0075] Auxiliary rods 13 are located at both ends of the main rod 11, serving as a means of lateral reinforcement for the main rod 11, such as... Figure 13 As shown, the main booms 11 are connected in pairs on the left and right sides of the main boom 11, and each has an independent folding structure.

[0076] Therefore, such as Figure 13 As shown, the auxiliary hanger 13 includes multiple auxiliary hangers (41, 42, 43, 44, 45) and multiple brackets (51, 52, 53, 54, 55). Figure 13 and Figure 15As shown, each auxiliary suspension rod (41, 42, 43, 44, 45) is a cylinder with a cross-section of a polygon such as a quadrilateral, or a circle, an ellipse, or a racetrack shape. A plurality of them are telescopically overlapped along the length direction and have a folding structure that facilitates folding with a gradually decreasing cross-sectional area from bottom to top.

[0077] In particular, on the cross-section of each auxiliary suspension rod (41, 42, 43, 44, 45), instead of forming an open part, the above-mentioned various cross-sectional shapes are formed. As Figure 15 shown, when considering the second moment of area with respect to the cross-sectional area, preferably, it has a longitudinally long and transversely short rectangular tubular cross-section.

[0078] The brackets (51, 52, 53, 54, 55) are means for supporting the front end, that is, the upper end of the corresponding auxiliary suspension rods (41, 42, 43, 44, 45). As Figure 13 shown, they protrude laterally and are joined to the front side surfaces of the corresponding suspension rods (21, 22, 23, 24, 25, 26). They are joined respectively in the following ways: The first bracket 51 is fitted on the outer suspension rod 21 at the lower end connected to the vehicle 10 in the suspension rod 1, and the fifth bracket 55 is fitted on the fifth suspension rod 25. Thus, each bracket (51, 52, 53, 54, 55) supports the front end portions of the corresponding auxiliary suspension rods (41, 42, 43, 44, 45) in such a way that the first bracket 51 supports the auxiliary suspension rod 41 and the fifth bracket 55 supports the fifth auxiliary suspension rod 45. For this purpose, as Figure 12 and Figure 13 shown, each bracket (51, 52, 53, 54, 55) forms a through-hole 57 at the upper part, and the front end portion of the auxiliary suspension rod (41, 42, 43, 44, 45) is snapped into the through-hole 57 and supported. In particular, all of the auxiliary suspension rods 41 corresponding to the outer suspension rod 21 are fitted on both side surfaces of the outer suspension rod 21, thereby improving the support strength of the auxiliary suspension rod 13.

[0079] Thus, the suspension rod 1 combines the auxiliary suspension rod 13 on the main suspension rod 11 and withstands the load applied to the main suspension rod 11 together with the auxiliary suspension rod 13. Therefore, the main suspension rod 11 can be strengthened by the auxiliary suspension rod 13, and the bending stiffness of the entire suspension rod can be significantly improved.

[0080] The extension ladder 15 can lower the carriage of the aerial ladder truck 10 to the ground. As Figure 10 and Figure 11 shown, it is assembled at the lower end of the main suspension rod 11. As Figures 13 to 16 shown, it is fixed on the upper surface of the outermost auxiliary suspension rod 41 among the plurality of auxiliary suspension rods (41, 42, 43, 44, 45), and is clamped with a fastening band 71 fitted in a 'C'-shape. As Figure 13 and Figure 14As shown, the movement of the main boom 11 is guided and supported above the outermost outer boom 21 located among the booms (21, 22, 23, 24, 25, 26), as... Figure 15 and Figure 16 As shown, it includes a rolling plate 81 and an anti-detachment boss 82.

[0081] The rolling plate 81 is the plate that supports the 3 wheels 77 of the trolley, such as... Figure 15 As shown, it is arranged laterally to support the wheels 77 of the trolley 3. The wheels 77 of the trolley 3 are located in pairs on both sides. Therefore, the rolling plates 81 can extend along the length direction and be located at the upper ends of the main lifting rods 11 on both sides, supporting the wheels 77 of the trolley 3 in pairs. Furthermore, they are arranged parallel to the upper ends of the main lifting rods 11, so the wheels 77 of the trolley 3 can easily move on the upper ends of the main lifting rods 11 and the upper part of the rolling plates 81.

[0082] The anti-detachment boss 82 is a component that prevents the wheels 77 of the trolley 3 from falling off the outside of the rolling plate 81, such as... Figure 15 and Figure 16 As shown, it protrudes upward along the outer edge of the rolling plate 81 and protrudes according to the height of the fastening band 71 so that the upper end can be precisely engaged with the upper part of the fastening band 71.

[0083] Therefore, the anti-detachment protrusion 82 prevents the wheels 77 of the trolley 3 from falling to the side from the extension ladder 15. Thus, the trolley 3 can be moved safely when it is located on the extension ladder 15.

[0084] Additionally, when the extension ladder 15 is clamped into the fastening strap 71, a guide boss 83 may be included to achieve a secure connection, so as to allow movement relative to the main hanger 11 while engaging the main hanger 11 and the auxiliary hanger 13.

[0085] like Figure 15 and Figure 16 As shown, the guide boss 83 and the anti-slip boss 82 face each other, with the guide boss 83 integrally protruding on the outer side of the anti-slip boss 82 and inserted into the guide groove (G) formed between the fastening band 71 and the outer hanger 21. Figure 16 As shown, the guide groove (G) is formed between the upper part of the outer side wall 21a of the outer hanger 21, which forms a step difference based on the height difference (t) between the outer hanger 21 and the auxiliary hanger, and the lower part of the inner side wall 71a of the fastening band 71, so as to insert the guide boss 83. Therefore, the extension ladder 15 can be guided to the guide groove (G) and moved relative to the main hanger 11.

[0086] Therefore, its advantage is that the extension ladder 15 is firmly connected with the fastening strap 71 and the guide groove (G), and the extension ladder 15 is formed by the combination structure of the main hanger 11 and the auxiliary hanger 13 and the fastening strap 71, which allows the extension ladder 15 to move relative to the main hanger 11.

[0087] Furthermore, its advantage lies in the fact that when the extension ladder 15 is formed, the extension ladder 15 is attached to the lower end of the main hoist 11, which is reinforced by auxiliary hoisting rods 13 on both sides, and can be moved relative to each other and extended to the ground. This allows the trolley 3, which moves with the main hoist 11 using the extension ladder 15, to descend to near the ground, easily realizing the loading and unloading of goods on the trolley 3.

[0088] Additionally, the fastening band 71 can be simply formed into a shape that wraps around the extending ladder 15, but, as Figure 14 , Figure 16 and Figure 17 As shown, the roller section 73 is provided with rollers 73a, so the extension ladder 15 can be smoothly guided to the length direction to achieve sliding.

[0089] like Figure 16 and Figure 17 As shown, in the roller section 73, the roller bracket 73b is rotatably coupled to the roller 73a and is coupled to the side of the fastening belt 71. The roller 73a passes through the through groove 71b and contacts the side of the extension ladder 15. The through groove 71b is formed by perforation on the side of the fastening belt 71 to which the roller section 73 is coupled. The roller 73a remains in contact with the side of the extension ladder 15, thus the extension ladder 15 can be guided to slide in the length direction.

[0090] Furthermore, when the suspension rod 1 is not in use, the extension ladder 15 needs to be retracted to the upper part of the main suspension rod 11 and then secured so that it no longer extends. This securing operation can be accomplished using the roller 73a of the fastening strap 71. For this purpose, as follows... Figure 14 As shown, a groove (H) is formed in a portion of the extended ladder 15, and as... Figures 15 to 17 As shown, the fastening band 71 further includes a fastening portion 75, which applies pressure to the entire roller portion 73 in the direction of the groove (H).

[0091] like Figure 14 As shown, the groove (H) is formed in an aligned position so that when the extension ladder 15 is retracted to the upper part of the main rod 11, the groove (H) is moved to the position of the roller 73a and engaged with the roller 73a. Alternatively, it can be formed so that the roller 73a is engaged only when the extension ladder 15 is fully retracted. However, when multiple grooves (H) are formed at any position of the extension ladder 15, the length of the extension ladder 15 extending from the main rod 11 can be selectively set.

[0092] like Figure 17 As shown, the fastening part 75 is formed in a 'C' shape and is combined on the side of the fastening belt 71 so that the fixing bracket 75b can accommodate the roller part 73. Moreover, screw holes are formed by perforating on the surface parallel to the side of the fastening belt 71 to combine and fix the operating lever 75a.

[0093] Thus, as Figure 16 shown, the entire roller part 73 is inserted into the through groove 71b of the fastening belt 71 and moves along the vertical direction of the side of the extension ladder 15, so that the entire roller part 73 moves from the through groove 71b to the position where the roller 73a contacts the side of the extension ladder 15 and maintains the state, so as to guide the extension ladder 15 by contacting the side of the extension ladder 15 during the period when the roller 73a is pulled out or retracted into the extension ladder 15.

[0094] And, as Figure 16 shown, when the storage of the extension ladder 15 is completed, by the fixing lever 75a, pressure is applied to the entire roller part 73, that is, the roller bracket 73b, in the direction of the groove part (H), so that the roller 73a can be fixed in the state of being inserted into the groove part (H), and the roller 73a can be kept in the state of being snapped and fixed.

[0095] At this time, if slightly careless, the roller part 73 may break away from the through groove 71b. Therefore, as Figure 16 shown, preferably, the internal space of the fixing bracket 75b is formed to be smaller than the thickness in the moving direction of the roller bracket 73b in the through groove 71b, preventing the roller part 73 from completely breaking away from the through groove 71b.

[0096] Therefore, as described above, when the roller part 73 and the fastening part 75 are formed on the fastening belt 71 and the roller 73a for guiding the extension ladder 15 is used to fix the extension ladder 15, the extension ladder 15 can be guided and fixed through the roller structure. The advantage is that the relative movement and fixation of the extension ladder 15 can be simply realized by one structure.

[0097] The above content has described the specific implementation manners of the present invention. However, they are only used to describe the present invention and are not used to limit the protection scope of the present invention. For those of ordinary skill in the technical field to which the present invention pertains, obviously, various substitutions, deformations and changes can be made without departing from the technical idea of the present invention.

[0098] Industrial Application

[0099] According to the present invention, the boom for a horizontally strengthened aerial ladder truck can strengthen the two sides of the main boom that is open upward through the auxiliary boom with a closed cross-section. Therefore, the overall bending stiffness of the boom can be further improved. In particular, the load-bearing capacity at the front end in the extended state and the overall strength of the bending load-bearing due to its own weight can be further improved.

Claims

1. A boom for a laterally reinforced aerial ladder truck, characterized in that, include: The main boom (11), which is rotatably mounted on the vehicle (10), can be extended in multiple positions; and Auxiliary rods (13) can be telescopically attached to the two lateral sides of the main rod (11) in multiple positions; The auxiliary lifting rod (13) includes: Multiple auxiliary suspension rods (41, 42, 43, 44, 45) are folded together with decreasing cross-sectional areas; and Multiple brackets (51, 52, 53, 54, 55) protrude laterally and attach to the side of the front end of the boom (21, 22, 23, 24, 25, 26) of each of the main booms (11) to support the front end portion of the corresponding auxiliary boom (41, 42, 43, 44, 45).

2. The boom for a laterally reinforced aerial ladder truck according to claim 1, characterized in that, Among the main boom (11) booms (21, 22, 23, 24, 25, 26), the auxiliary outer booms corresponding to the outer booms connected to the vehicle (10) are attached to the two sides of the outer booms.

3. The boom for a laterally reinforced aerial ladder truck according to claim 1 or 2, characterized in that, The multiple auxiliary rods (41, 42, 43, 44, 45) each have a circular or elliptical cross-section.

4. The boom for a laterally reinforced aerial ladder truck according to claim 1 or 2, characterized in that, The multiple auxiliary rods (41, 42, 43, 44, 45) each have a polygonal cross-section.

5. The boom for a laterally reinforced aerial ladder truck according to any one of claims 1 to 2, characterized in that, include: An extension ladder (15), which is mounted on the lower end of the main boom (11) relative to the main boom (11), extends to the ground when the ladder truck is started, thereby lowering the trolley (3) of the ladder truck to the ground.

6. The boom for a laterally reinforced aerial ladder truck according to claim 5, characterized in that, The extension ladder (15) is guided by a fastening strap (71) to move with the main suspension rod (11) and is supported above the outermost outer suspension rod among the suspension rods (21, 22, 23, 24, 25, 26), the fastening strap being attached to the outermost auxiliary suspension rod among the plurality of auxiliary suspension rods (41, 42, 43, 44, 45).

7. The boom for a laterally reinforced aerial ladder truck according to claim 6, characterized in that, The fastening band (71) has a roller portion (73) to guide the extension ladder (15) to slide. When the extension ladder (15) is retracted along the upper direction of the main hanger, the roller (73a) of the roller portion (73) engages with the groove (H) formed in the extension ladder (15) to fix the extension ladder (15).

8. The boom for a laterally reinforced aerial ladder truck according to claim 7, characterized in that, The fastening band (71) has a fastening part (75) that applies pressure to the roller part (73) along the direction of the groove (H) when the extension ladder (15) is retracted along the upper direction of the main hanger (11), so that the roller (73a) is fixed in the groove (H).

9. The boom for a laterally reinforced aerial ladder truck according to claim 6, characterized in that, The extension ladder (15) includes: A pair of rolling plates (81) extending along the length direction to support the wheels (77) of the trolley (3); and An anti-detachment protrusion (82) protrudes upward along the outer edge of the rolling plate (81) to prevent the wheel (77) rolling on the rolling plate (81) from falling off to the outside of the rolling plate (81).

10. The boom for a laterally reinforced aerial ladder truck according to claim 9, characterized in that, The extension ladder (15) includes a guide boss (83) integrally formed on the outer side of the anti-detachment boss (82) for insertion into a guide groove (G) to guide movement with the main suspension rod. The guide groove (G) is formed between the upper part of the outer side wall (21a) of the outer suspension rod, which forms a step difference based on the height difference (t) between the outermost outer suspension rod and the auxiliary suspension rod located in the suspension rods (21, 22, 23, 24, 25, 26), and the lower part of the inner side wall (71a) of the fastening band (71).

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