Boom for aerial work equipment

Abstract

The present invention relates to a boom for aerial work equipment, in which a reinforcing material (e.g., carbon fiber) capable of significantly improving strength against a bending load and a lateral load as well as yield strength against a partial load, which locally occurs, and minimizing a weight of the equipment is installed to be inserted into the inside or outside of a sidewall.

Description

TECHNICAL FIELD

[0001] The present invention relates to a boom for aerial work equipment, in which a reinforcing material (e.g., carbon fiber) capable of significantly improving strength against a bending load and a lateral load as well as yield strength against a partial load, which locally occurs, and minimizing a weight of the equipment is installed to be inserted into the inside or outside of a sidewall.BACKGROUND ART

[0002] Aerial work equipment may include ladder trucks, cranes, etc., for towing, transporting, or firefighting, and may move objects or workers to work positions for aerial works such as high-rise buildings or utility poles by using multi-stage booms.

[0003] The multi-stage boom of the aerial work equipment is withdrawn sequentially like a telescope, or inserted and retracted in reverse order.

[0004] In order to improve the strength of the boom that is withdrawn in this manner, a boom utilizing a conventional composite structure is disclosed, for example, as known in the patent document (US7,781,039 B2).

[0005] Referring to FIG. 5 of the patent document, a boom 22 utilizing a conventional composite structure is configured by welding four steel plates 42A, 42B, 42C, and 42D together. Each of the four steel plates 42A to 42D has a hollow structure with a rectangular cross-section. The steel plates 42A to 42D have outer surfaces 44A, 44B, 44C, and 44D, respectively. Upper and lower reinforcing layers 34A and 34B are bonded to the outer surfaces 44A and 44C of the steel plates 42A and 42C. The reinforcing layers 34A and 34B are preferably bonded to the upper plate 42A and the lower plate 42C because the reinforcing layers 34A and 34B are plates that typically experience the greatest tensile and compressive force due to vertical loads.

[0006] Thus, the steel plates 42A and 42C may be reinforced and strengthened, and thus, stress applied to the steel plates may be reduced, and deflection resistance of the boom 22 may be improved.

[0007] The reinforcing layers 34A and 34B are made of a reinforcing composite including a matrix material and a high tensile modulus fiber.

[0008] Referring to FIG. 7 of the patent document, the upper and lower reinforcing layers 34A and 34B may be fixed to the upper and lower steel plates 42A and 42C by curing a resin.

[0009] Referring to FIG. 8 of the patent document, the upper and lower reinforcing layers 34A and 34B may be attached to the upper and lower steel plates 42A and 42C using an adhesive 54.

[0010] Referring to FIG. 9 of the patent document, the upper and lower reinforcing layers 34A and 34B may be coupled to the upper and lower steel plates 42A and 42C using a mechanical fastener 56.

[0011] Since the reinforcing layers 34A and 34B are fixed to the steel plates 42A and 42C through the resin, the adhesive 54, and the mechanical fastener 56, costs may increase due to the time-consuming and complex process, and since the reinforcing layers 34A and 34B are fixed and exposed to the outer surfaces of the steel plates, the reinforcing layers 34A and 34B may react more sensitively to external environments such as weather to weaken durability.[Prior Art Document][Patent Document]

[0012] (Patent Document 1) US Patent No. US7,781,039 B2DISCLOSURE OF THE INVENTION TECHNICAL PROBLEM

[0013] The present invention, through an embodiment, intends to provide a boom for aerial work equipment that is not only very easy to install a reinforcing material at an appropriate position, but also improves productivity and economy through lightweight and high rigidity of the equipment.TECHNICAL SOLUTION

[0014] To solve the above-described problem, the present invention may include sidewalls facing each other, a lower connection platform configured to connect the sidewalls to each other, and a reinforcing material installed on each of the sidewalls, wherein each of the sidewalls may include; a side plate; upper and lower plates extending inward from upper and lower sides of the side plate, respectively; and an insertion part disposed along a longitudinal direction inside or outside the upper plate and the side plate or the lower plate and the side plate, and inserted into the insertion part.ADVANTAGEOUS EFFECTS

[0015] As described above, the boom for aerial work equipment according to the embodiment of the present invention may have the following effects.

[0016] According to the embodiment of the present invention, the sidewall may be implemented as the profile extruded using aluminum to easily provide the suitable location at which the reinforcing material needs to be installed.

[0017] According to the embodiment of the present invention, when the reinforcing material is inserted simply along the longitudinal direction of the insertion part of the sidewall, the installation may be completed, and thus, it may be very easy for the installation.

[0018] According to the embodiment of the present invention, the insertion rail groove supporting the reinforcing material may be formed to be tapered at the acute angle, and thus, the original thickness of the sidewall may be maximally maintained to further increase in strength.

[0019] According to the embodiment of the present invention, the adhesive filling hole and the concave passage groove may be defined along the longitudinal direction of the sidewall to allow the filled adhesive to smoothly flow so that the reinforcing material is firmly attached to the sidewall, thereby preventing the reinforcing material from being separated in the longitudinal direction.

[0020] According to the embodiment of the present invention, the uplift part corresponding to the concave passage groove may be defined in the outer surface of the side plate, and thus, when slid with the adjacent boom, the uplift part may form the contact area close to the line contact as the contact surface having the band shape, thereby enabling the smooth deployment or accommodation.

[0021] According to the embodiment of the present invention, the reinforcing material may be riveted to the sidewall to mechanically couple the reinforcing material to the sidewall, thereby preventing the reinforcing material from being separated in the longitudinal direction of the reinforcing material.BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIGS. 1 and 2 are side views illustrating deployment and accommodation of a boom of an aluminum crane for an aerial work according to a preferred embodiment of the present invention. FIG. 3 is a front view illustrating the boom of FIG. 1. FIG. 4 is a perspective view illustrating a sidewall of FIG. 3 from the inside. FIG. 5 is a perspective view illustrating a state in which a reinforcing material is inserted into an insertion part of the sidewall of FIG. 3. FIG. 6 is a perspective view illustrating the sidewall, to which the reinforcing material is installed, from the outside. FIG. 7 is a front view of FIG. 6. FIG. 8 is a cross-sectional view taken along line 8-8 of FIG. 6. FIG. 8a is a cross-sectional view according to another embodiment of FIG. 8. FIG. 9 is a front view illustrating a state in which the reinforcing material is riveted to the sidewall. FIGS. 10 to 17 are front views according to another embodiment of FIG. 8. FIG. 17a is a front view illustrating a state in which an insertion part for an inner side and an insertion part for a hollow are mixed. FIGS. 18 and 19 are side views illustrating deployment and accommodation of a boom of a ladder truck for transporting loads. FIG. 20 is a front view illustrating the boom of FIG. 18. MODE FOR CARRYING OUT THE INVENTION

[0023] Hereinafter, descriptions of following embodiments are intended to be illustrative, and those with ordinary skill in the technical field of the present disclosure pertains will be understood that the present disclosure can be carried out in other specific forms without changing the technical idea or essential features. However, in describing the present disclosure, if it is determined that detailed descriptions of related known functions or components may unnecessarily obscure the gist of the present disclosure, the detailed descriptions and specific illustrations will be omitted. Additionally, in order to facilitate understanding of the invention, the attached drawings are not drawn to scale and the dimensions of some components may be exaggerated.

[0024] The first and second terms used in this application may be used to describe various components, but the components should not be limited by the terms. Terms are only used to distinguish one component from other components.

[0025] In addition, in the following description, the technical terms are used only for explaining a specific exemplary embodiment while not limiting the present disclosure. The terms of a singular form may include plural forms unless referred to the contrary. In this application, terms such as "include," "constituted by," or "consist of" are intended to designate the presence of features, numbers, steps, operations, components, parts, or a combination thereof described in the specification, but it should be understood that this does not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0026] FIGS. 1 and 2 are side views illustrating deployment and accommodation of a boom of an aluminum crane for an aerial work according to a preferred embodiment of the present invention, and FIG. 3 is a front view illustrating the boom of FIG. 1.

[0027] Referring to FIGS. 1 and 2, a boom 1 of an aluminum crane for an aerial work may be a multi-stage boom that is capable of being deployed (see FIG. 1) or accommodated (see FIG. 2) like a telescope.

[0028] Referring to FIG. 3, the boom 1 according to the present embodiment may include a boom platform 10 and a reinforcing material 30 installed to be inserted into the boom platform 10. The reinforcing material 30 may be installed at the inside or outside, or both the inside and outside of the boom platform 10. The reinforcing material 30 may include, for example, a carbon fiber. The carbon fiber has advantages of high strength (2 to 5 times rigidity of aluminum and steel compared to its weight) high lightness (about 60% of that of aluminum), high corrosion resistance (resistance to corrosion is excellent to expand lifespan and improve durability), high heat resistance, impact resistance, and wear resistance, and excellent earthquake resistance due to combination of physical properties of carbon materials and morphological characteristics of fibers, and design flexibility (may be manufactured in various shapes).

[0029] The boom platform 10 of FIG. 3 may have a box shape and may include sidewalls 100 facing each other, and lower and upper connection platforms 140 and 150, which connect lower and upper portions of the sidewalls 100, respectively.

[0030] Each of the sidewalls 100 may be provided as an aluminum profile that is extruded in the longitudinal direction (the direction in which it is deployed and accommodated) in a -shape.

[0031] Each of the lower connection platform 140 and the upper connection platform 150 may include a transverse bar or a transverse plate installed at regular intervals along the longitudinal direction of the sidewall 100.

[0032] FIG. 4 is a perspective view illustrating a sidewall of FIG. 3 from the inside, FIG. 5 is a perspective view illustrating a state in which a reinforcing material is inserted into an insertion part of the sidewall of FIG. 3, FIG. 6 is a perspective view illustrating the sidewall, to which the reinforcing material is installed, from the outside, FIG. 7 is a front view of FIG. 6, and FIG. 8 is a cross-sectional view taken along line 8-8 of FIG. 6.

[0033] Referring to FIGS. 4 to 7, the sidewall 100 may include a side plate 110. The side plate 110 may be a vertical plate.

[0034] The sidewall 100 may include upper and lower plates 120 and 130. The upper and lower plates 120 and 130 may be horizontal plates extending inward from upper and lower sides of the side plates 110.

[0035] The sidewall 100 may include an insertion part 170. The reinforcing member 30 may be installed to be inserted into the insertion part 170 as illustrated in FIG. 5.

[0036] Referring to FIGS. 4 and 7, the insertion part 170 may include an insertion groove 171 for an inner edge. The insertion groove 171 for the inner edge may be defined along a longitudinal direction on the inner edges of the top plate 120 and the side plate 110. The inner edge may include an inner side of the top plate 120 and an upper inner side of the side plate 110.

[0037] Referring to FIGS. 4 and 7, the insertion part 170 may include an insertion rail groove 173 for the inner edge. The insertion rail groove 173 for the inner edge may be defined in both ends of the insertion groove 171 for the inner edge. The insertion rail groove 173 for the inner edge may be a -shaped groove. The insertion rail groove 173 for the inner edge may support each of both ends of the reinforcing material 30 to prevent the reinforcing material 30 from being separated inward.

[0038] Referring to FIGS. 5 and 7, the reinforcing material 30 may include a reinforcing material 31 for the inner edge. The reinforcing material 31 for the inner edge may have a shape and may be inserted and accommodated into the insertion groove 171 for the inner edge and the insertion rail groove 173 for the inner edge.

[0039] As described above, the reinforcing material 31 for the inner edge may be inserted into the insertion groove 171 for the inner edge and the insertion rail groove 173 for the inner edge to most efficiently reinforce the most vulnerable portion of the boom platform 10. Thus, while maintaining the lightness of the boom platform 10, it is possible to prevent the boom platform 10 from being sagged, twisted, or broken during the work due to external force or wind.

[0040] Furthermore, referring to FIGS. 4 to 7, the insertion part 170 may further include an insertion groove 175 for the inner side of the side plate. The insertion groove 175 for the inner side of the side plate may be a vertical groove. The insertion groove 175 for the inner side of the side plate may be defined along the longitudinal direction at an inner side near a center of the side plate 110.

[0041] In addition, the insertion part 170 may include an insertion rail groove 177 for the inner side of the side plate in a -shape. The insertion rail groove 177 for the inner side of the side plate may be defined in each of both ends of the insertion groove 175 for the inner side of the side plate.

[0042] The reinforcing material 30 may include a reinforcing material 33 for the inner side of a linear side plate. The reinforcing material 33 for the inner side of the side plate may be inserted and accommodated into the insertion groove 175 for the inner side of the side plate and the insertion rail groove 177 for the inner side of the side plate.

[0043] Referring to FIG. 6 and FIG. 8, the sidewall 100 may include an adhesive filling hole 180. The adhesive filling hole 180 may be defined in the sidewall 100 at a portion into which the reinforcing material 30 is inserted. For example, the adhesive filling hole 180 may be defined to pass through the side plate 110 and the top plate 120. The adhesive filling hole 180 may allow the inserted reinforcing material 30 to be in more close contact with the sidewall 100, thereby preventing the reinforcing material 30 from being separated in the longitudinal direction.

[0044] In addition, the sidewall 100 may include a concave passage groove 190. The concave passage groove 190 may be defined along the longitudinal direction inside the insertion part 170 so as to communicate with the adhesive filling hole 180. The concave passage groove 190 may act as a flow passage through which an adhesive filled in the adhesive filling hole 180 flows along the longitudinal direction to allow the adhesive to be quickly permeated into the reinforcing material 30.

[0045] Since the concave passage groove 190 is a groove that is recessed from the inside to the outside of the sidewall 100, a uplift part 181 may be provided and reinforced at a portion in which the adhesive filling hole 180 is defined, to reinforce the recessed groove. The uplift part 181 may be uplifted by a degree of the recess of the concave passage groove 190 to not only offset a reduction in thickness of the sidewall 100, but also define a band-shaped contact surface when slid with an adjacent boom so that the deployment and the accommodation are smooth.

[0046] Unlike the insertion part of FIG. 8, an insertion part of FIG. 8a may have an L shape and include an insertion groove 175' for the inner side of the side plate and an insertion groove 176' for the inner side of the lower plate.

[0047] In addition, the insertion part of FIG. 8a may include an insertion rail groove 177' for each of the inner sides of the side plate / lower plate at an end of the insertion groove 175' for the inner side of the side plate and at an end of the insertion groove 176' for the inner side of the lower plate.

[0048] A reinforcing material 33' of FIG. 8a may have an L shape and may be installed to be inserted into the insertion groove 175' for the inner side of the side plate, the insertion groove 176' for the inner side of the lower plate, and the insertion rail groove 177' for each of the inner sides of the side plate / lower plate.

[0049] FIG. 9 is a front view illustrating a state in which the reinforcing material 30 is riveted to the sidewall 100.

[0050] Referring to FIG. 9, the reinforcing material 30 may be mechanically coupled to the sidewall 100 by being riveted using a rivet R. The rivet R may be a blind rivet. When a rivet shaft is inserted into a rivet hole RH and then pulled with a gun, a rivet head may be generated at an opposite side to compete the riveting.

[0051] FIGS. 10 to 17 are front views according to another embodiment of FIG. 8.

[0052] FIG. 10 is similar in structure and function to FIGS. 8 and 9, but there is a difference in that an insertion part 170a and a reinforcing material 30a are integrated with each other, and others are the same, and thus, the same reference numerals are given, and detailed descriptions will be omitted.

[0053] That is, referring to FIG. 10, the insertion part 170a may include a -shaped insertion groove 171a for an inner side. The insertion groove 171a for the inner side may be integrated along a longitudinal direction at an inner side of a side plate 110 and an inner side of an upper plate 120.

[0054] The insertion part 170a may include a -shaped insertion rail groove 173a for the inner side. The insertion rail groove 173a for the inner side may be defined in each of both ends of the insertion groove 171a for the inner side.

[0055] The reinforcing material 30a may include a reinforcing material 30a for the inner side, which is integrally inserted into the insertion groove 171a for the inner side and the insertion rail groove 173a for the inner side.

[0056] Referring to FIG. 11, the insertion part 170b may include a -shaped insertion groove 170b for a hollow. The insertion groove 170b for the hollow may be integrated along a longitudinal direction inside a sidewall 100. That is, the insertion groove for the hollow 170b may include an insertion groove 171b for the hollow of the side plate 110, an insertion groove 172b for the hollow of an upper plate 120, and an insertion groove 173b for the hollow of the lower plate 130.

[0057] The reinforcing material 30b may include a -shaped reinforcing material 30b for the hollow, which is inserted into the insertion groove 170b for the hollow. That is, the reinforcing material 30b for the hollow may include a reinforcing material 31b for the hollow of the side plate 110, a reinforcing material 32b for the hollow of the upper plate 120, and a reinforcing material 33b for the hollow of the lower plate 130.

[0058] As described above, the reinforcing material 30b may be installed to be inserted into the insertion groove for the hollow 170b, which is defined inside the sidewall 100, not only the insertion may be more easy, but also strength may also be greatly improved as it is integrally surrounded.

[0059] Referring to FIG. 12, the insertion part 170c may be divided into an upper insertion groove 171c for the hollow and a lower insertion groove 173c for the hollow. That is, the upper insertion groove 171c for the hollow may be defined in a -shape inside an upper edge, and the lower insertion groove 173c for the hollow may be defined in a -shape inside a lower edge.

[0060] The reinforcing material 30c may include an upper reinforcing material 31c for the hollow, which is inserted into the upper insertion groove 171c for the hollow, and a lower reinforcing material 33c for the hollow, which is inserted into the lower insertion groove 173c for the hollow.

[0061] Referring to FIGS. 13 to 15, a sidewall 100' may include a side plate 110' and upper and lower plates 120' and 130'.

[0062] The sidewall 100' may include an insertion part 170'. A reinforcing material 30' may be installed to be inserted into the insertion part 170'.

[0063] The insertion part 170' may include an insertion groove 171' for an inner edge, an insertion rail groove 173' for the inner edge, and insertion grooves 175' and 177' for an inner side of the side plate.

[0064] In particular, each of the insertion rail groove 173' for the inner edge and the insertion rail groove 177' for the inner side of the side plate may be defined as a groove tapered at an acute angle.

[0065] Unlike the -shaped insertion rail grooves 173' and 177' , the acutely tapered insertion rail grooves 173' and 177' may further improve rigidity by maintaining a thickness T1 of the sidewall 100', which is thicker than a thickness T1 of the sidewall 100.

[0066] Likewise, the reinforcing material 30' may include a reinforcing material 31' for the inner edge and a reinforcing material 33' for the inner side of the side plate. Both ends of the reinforcing material 31' for the inner side and the reinforcing material 33' for the inner side of the side plate may also be provided as grooves tapered at an acute angle. Thus, the thickness T2 of the acutely tapered reinforcing material 30' may be maintained to be thicker than a thickness t2 of the reinforcing material 30 to further improve the rigidity.

[0067] An insertion part 170a' and a reinforcing material 30a', which are described with reference to FIG. 16, are similar in structure and function to the insertion part 170' and the reinforcing material 30' of FIG. 15, but there is a difference in that the insertion part 170a' and a reinforcing material 30a' are integrated with each other.

[0068] That is, referring to FIG. 16, the insertion part 170a' may include an insertion groove 171a' for an inner side and an insertion rail groove 173a' for the inner side.

[0069] The insertion groove 171a' for the inner side may be integrally provided along a longitudinal direction inside the side plate 110' and the upper plate 120'.

[0070] The insertion rail groove 173a' for the inner side may be defined as a groove tapered at an acute angle at each of both ends of the insertion groove 171a' for the inner side.

[0071] The reinforcing material 30a' may also include a reinforcing material 30a' for the inner side, which is inserted into the insertion groove 171a' for the inner side and the insertion rail groove 173a' for the inner side.

[0072] Both ends of the reinforcing material 30a' for the inner side may also be tapered at an acute angle.

[0073] FIG. 17 is a front view of a boom in which the reinforcing material is installed inside and outside the sidewall.

[0074] Referring to FIG. 17, a sidewall 100" may include a side plate 110'' and upper and lower plates 120" and 130''.

[0075] Like FIG. 15, an inner insertion part 170'' and an inner reinforcing material 30" may be provided inside the side plate 110''.

[0076] The inner insertion part 170'' may include an insertion groove 171'' for an inner edge, which is defined in each of inner edges of the side plate 110'' and the upper plate 120'', and an insertion rail groove 173'' for the inner side, which is defined in each of both ends of the insertion groove 171" for the inner edge and is tapered at an acute angle.

[0077] The reinforcing material 30" may include a reinforcing material 31'' for the inner edge, which is inserted into the insertion groove 171'' for the inner edge. Each of both ends of the reinforcing material 31'' for the inner edge may be tapered at an acute angle so as to be inserted into the insertion rail groove 173'' for the inner edge.

[0078] The inner insertion part 170'' may include an insertion groove 175'' for the inner side, which is defined inside a center of the side plate 110'' and an insertion rail groove 177'' for the inner side, which is defined in each of both ends of the insertion groove 175'' for the inner side and is tapered an acute angle.

[0079] The reinforcing material 30" may include a reinforcing material 33" for the inner side, which is inserted into the insertion groove 175" for the inner side. Each of both ends of the reinforcing material 31'' for the inner side may be tapered at an acute angle so as to be inserted into the insertion rail groove 177" for the inner side.

[0080] Referring to FIG. 17, an outer insertion part 170a" and an outer reinforcing material 30a" may be provided outside the side plate 110".

[0081] The outer insertion part 170a" may include an upper insertion groove 171a" for an outer side, which is defined outside an upper portion of the side plate 110'', and an upper insertion rail groove 173a" for the outer side, which is tapered at an acute angle at each of both ends thereof.

[0082] The corresponding outer reinforcing material 30a'' may include an upper outer reinforcing material 31a", which is inserted into the upper insertion groove 171a" for the outer side and the upper insertion rail groove 173a" for the outer side. Each of both ends of the upper outer reinforcing material 31a" may also be tapered at an acute angle.

[0083] In addition, the outer insertion part 170a'' may include a lower insertion groove 175a'' for an outer side, which is defined outside a lower portion of the side plate 110", and a lower insertion rail groove 177a'' for the outer side, which is tapered at an acute angle at each of both ends thereof.

[0084] The corresponding outer reinforcing material 30a'' may include a lower outer reinforcing material 33a", which is inserted into a lower insertion groove 175a'' for the outer side and a lower insertion rail groove 177a" for the outer side. Each of both ends of the lower outer reinforcing material 33a'' may also be tapered at an acute angle.

[0085] FIG. 17a is a front view illustrating a state in which the insertion part for the inner side and the insertion part for the hollow are mixed.

[0086] The insertion part for the inner side of FIG. 17a may include an insertion groove 171d for the inner side, which is defined downward from a center at the inside of the upper plate 120 and an upper end of the side plate 110 and an insertion rail groove 173d for the inner side, which is defined in each of both ends of the insertion groove 171d for the inner side.

[0087] The reinforcing material 30d for the inner side of FIG. 17a may include a reinforcing material 31d for the inner side, which is installed to be inserted into the insertion groove 171d for the inner side and the insertion rail groove 173d for the inner side.

[0088] In addition, the insertion part for the inner side of FIG. 17a may include an insertion groove for a hollow 175d, which is defined at a lower side of the side plate 110 and at the inside of the lower plate 130.

[0089] The reinforcing material 30d for the inner side of FIG. 17a may include a reinforcing material 33d for the hollow, which is installed to be inserted into the insertion groove 175d for the hollow.

[0090] FIGS. 18 and 19 are side views illustrating deployment and accommodation of a boom of a ladder truck for transporting loads.

[0091] A boom 1' of a ladder truck is similar in structure and function to the boom 1 of the crane, but there is a difference in that there is no upper connection platform connecting an upper portion of a boom platform 10', as illustrated in FIG. 20.

[0092] That is, the boom platform 10' of the ladder truck may include a sidewall 10a' and a lower connection platform 14' connecting a lower portion of the sidewall 10a'.

[0093] The sidewall 10a' may include a side plate 11' and upper and lower plates 12' and 13' extending inward from an upper side of the side plate 11'. A profile of the sidewall 10' may be extruded to fit the ladder truck, but the insertion part and the reinforcing material of the sidewall for the crane may also be applied as they are.

[0094] That is, the insertion part as illustrated in FIGS. 1 to 17 may be defined in the side plate 11' of the boom platform 10' of the ladder truck, and the reinforcing material may be installed to be inserted into the insertion part.

[0095] While the embodiments of the inventive concept have been described with reference to the specific embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.

[0096] [Description of the Symbols]1,1' :Boom10,10':Boom platform30:Reinforcing material (carbon fiber)100:Sidewall110:Side plate120,130:Upper and lower plates170:Insertion part171:Insertion part for inner edge173:Insertion rail groove for inner edge175:Insertion part for inner side177:Insertion rail groove for inner side180:Adhesive filling hole190:Concave passage groove

Examples

Embodiment Construction

[0023]Hereinafter, descriptions of following embodiments are intended to be illustrative, and those with ordinary skill in the technical field of the present disclosure pertains will be understood that the present disclosure can be carried out in other specific forms without changing the technical idea or essential features. However, in describing the present disclosure, if it is determined that detailed descriptions of related known functions or components may unnecessarily obscure the gist of the present disclosure, the detailed descriptions and specific illustrations will be omitted. Additionally, in order to facilitate understanding of the invention, the attached drawings are not drawn to scale and the dimensions of some components may be exaggerated.

[0024]The first and second terms used in this application may be used to describe various components, but the components should not be limited by the terms. Terms are only used to distinguish one component from other components.

[002...

TECHNICAL FIELD

[0001] The present invention relates to a boom for aerial work equipment, in which a reinforcing material (e.g., carbon fiber) capable of significantly improving strength against a bending load and a lateral load as well as yield strength against a partial load, which locally occurs, and minimizing a weight of the equipment is installed to be inserted into the inside or outside of a sidewall.BACKGROUND ART

[0002] Aerial work equipment may include ladder trucks, cranes, etc., for towing, transporting, or firefighting, and may move objects or workers to work positions for aerial works such as high-rise buildings or utility poles by using multi-stage booms.

[0003] The multi-stage boom of the aerial work equipment is withdrawn sequentially like a telescope, or inserted and retracted in reverse order.

[0004] In order to improve the strength of the boom that is withdrawn in this manner, a boom utilizing a conventional composite structure is disclosed, for example, as known in the patent document (US7,781,039 B2).

[0005] Referring to FIG. 5 of the patent document, a boom 22 utilizing a conventional composite structure is configured by welding four steel plates 42A, 42B, 42C, and 42D together. Each of the four steel plates 42A to 42D has a hollow structure with a rectangular cross-section. The steel plates 42A to 42D have outer surfaces 44A, 44B, 44C, and 44D, respectively. Upper and lower reinforcing layers 34A and 34B are bonded to the outer surfaces 44A and 44C of the steel plates 42A and 42C. The reinforcing layers 34A and 34B are preferably bonded to the upper plate 42A and the lower plate 42C because the reinforcing layers 34A and 34B are plates that typically experience the greatest tensile and compressive force due to vertical loads.

[0006] Thus, the steel plates 42A and 42C may be reinforced and strengthened, and thus, stress applied to the steel plates may be reduced, and deflection resistance of the boom 22 may be improved.

[0007] The reinforcing layers 34A and 34B are made of a reinforcing composite including a matrix material and a high tensile modulus fiber.

[0008] Referring to FIG. 7 of the patent document, the upper and lower reinforcing layers 34A and 34B may be fixed to the upper and lower steel plates 42A and 42C by curing a resin.

[0009] Referring to FIG. 8 of the patent document, the upper and lower reinforcing layers 34A and 34B may be attached to the upper and lower steel plates 42A and 42C using an adhesive 54.

[0010] Referring to FIG. 9 of the patent document, the upper and lower reinforcing layers 34A and 34B may be coupled to the upper and lower steel plates 42A and 42C using a mechanical fastener 56.

[0011] Since the reinforcing layers 34A and 34B are fixed to the steel plates 42A and 42C through the resin, the adhesive 54, and the mechanical fastener 56, costs may increase due to the time-consuming and complex process, and since the reinforcing layers 34A and 34B are fixed and exposed to the outer surfaces of the steel plates, the reinforcing layers 34A and 34B may react more sensitively to external environments such as weather to weaken durability.[Prior Art Document][Patent Document]

[0012] (Patent Document 1) US Patent No. US7,781,039 B2DISCLOSURE OF THE INVENTION TECHNICAL PROBLEM

[0013] The present invention, through an embodiment, intends to provide a boom for aerial work equipment that is not only very easy to install a reinforcing material at an appropriate position, but also improves productivity and economy through lightweight and high rigidity of the equipment.TECHNICAL SOLUTION

[0014] To solve the above-described problem, the present invention may include sidewalls facing each other, a lower connection platform configured to connect the sidewalls to each other, and a reinforcing material installed on each of the sidewalls, wherein each of the sidewalls may include; a side plate; upper and lower plates extending inward from upper and lower sides of the side plate, respectively; and an insertion part disposed along a longitudinal direction inside or outside the upper plate and the side plate or the lower plate and the side plate, and inserted into the insertion part.ADVANTAGEOUS EFFECTS

[0015] As described above, the boom for aerial work equipment according to the embodiment of the present invention may have the following effects.

[0016] According to the embodiment of the present invention, the sidewall may be implemented as the profile extruded using aluminum to easily provide the suitable location at which the reinforcing material needs to be installed.

[0017] According to the embodiment of the present invention, when the reinforcing material is inserted simply along the longitudinal direction of the insertion part of the sidewall, the installation may be completed, and thus, it may be very easy for the installation.

[0018] According to the embodiment of the present invention, the insertion rail groove supporting the reinforcing material may be formed to be tapered at the acute angle, and thus, the original thickness of the sidewall may be maximally maintained to further increase in strength.

[0019] According to the embodiment of the present invention, the adhesive filling hole and the concave passage groove may be defined along the longitudinal direction of the sidewall to allow the filled adhesive to smoothly flow so that the reinforcing material is firmly attached to the sidewall, thereby preventing the reinforcing material from being separated in the longitudinal direction.

[0020] According to the embodiment of the present invention, the uplift part corresponding to the concave passage groove may be defined in the outer surface of the side plate, and thus, when slid with the adjacent boom, the uplift part may form the contact area close to the line contact as the contact surface having the band shape, thereby enabling the smooth deployment or accommodation.

[0021] According to the embodiment of the present invention, the reinforcing material may be riveted to the sidewall to mechanically couple the reinforcing material to the sidewall, thereby preventing the reinforcing material from being separated in the longitudinal direction of the reinforcing material.BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIGS. 1 and 2 are side views illustrating deployment and accommodation of a boom of an aluminum crane for an aerial work according to a preferred embodiment of the present invention. FIG. 3 is a front view illustrating the boom of FIG. 1. FIG. 4 is a perspective view illustrating a sidewall of FIG. 3 from the inside. FIG. 5 is a perspective view illustrating a state in which a reinforcing material is inserted into an insertion part of the sidewall of FIG. 3. FIG. 6 is a perspective view illustrating the sidewall, to which the reinforcing material is installed, from the outside. FIG. 7 is a front view of FIG. 6. FIG. 8 is a cross-sectional view taken along line 8-8 of FIG. 6. FIG. 8a is a cross-sectional view according to another embodiment of FIG. 8. FIG. 9 is a front view illustrating a state in which the reinforcing material is riveted to the sidewall. FIGS. 10 to 17 are front views according to another embodiment of FIG. 8. FIG. 17a is a front view illustrating a state in which an insertion part for an inner side and an insertion part for a hollow are mixed. FIGS. 18 and 19 are side views illustrating deployment and accommodation of a boom of a ladder truck for transporting loads. FIG. 20 is a front view illustrating the boom of FIG. 18. MODE FOR CARRYING OUT THE INVENTION

[0023] Hereinafter, descriptions of following embodiments are intended to be illustrative, and those with ordinary skill in the technical field of the present disclosure pertains will be understood that the present disclosure can be carried out in other specific forms without changing the technical idea or essential features. However, in describing the present disclosure, if it is determined that detailed descriptions of related known functions or components may unnecessarily obscure the gist of the present disclosure, the detailed descriptions and specific illustrations will be omitted. Additionally, in order to facilitate understanding of the invention, the attached drawings are not drawn to scale and the dimensions of some components may be exaggerated.

[0024] The first and second terms used in this application may be used to describe various components, but the components should not be limited by the terms. Terms are only used to distinguish one component from other components.

[0025] In addition, in the following description, the technical terms are used only for explaining a specific exemplary embodiment while not limiting the present disclosure. The terms of a singular form may include plural forms unless referred to the contrary. In this application, terms such as "include," "constituted by," or "consist of" are intended to designate the presence of features, numbers, steps, operations, components, parts, or a combination thereof described in the specification, but it should be understood that this does not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0026] FIGS. 1 and 2 are side views illustrating deployment and accommodation of a boom of an aluminum crane for an aerial work according to a preferred embodiment of the present invention, and FIG. 3 is a front view illustrating the boom of FIG. 1.

[0027] Referring to FIGS. 1 and 2, a boom 1 of an aluminum crane for an aerial work may be a multi-stage boom that is capable of being deployed (see FIG. 1) or accommodated (see FIG. 2) like a telescope.

[0028] Referring to FIG. 3, the boom 1 according to the present embodiment may include a boom platform 10 and a reinforcing material 30 installed to be inserted into the boom platform 10. The reinforcing material 30 may be installed at the inside or outside, or both the inside and outside of the boom platform 10. The reinforcing material 30 may include, for example, a carbon fiber. The carbon fiber has advantages of high strength (2 to 5 times rigidity of aluminum and steel compared to its weight) high lightness (about 60% of that of aluminum), high corrosion resistance (resistance to corrosion is excellent to expand lifespan and improve durability), high heat resistance, impact resistance, and wear resistance, and excellent earthquake resistance due to combination of physical properties of carbon materials and morphological characteristics of fibers, and design flexibility (may be manufactured in various shapes).

[0029] The boom platform 10 of FIG. 3 may have a box shape and may include sidewalls 100 facing each other, and lower and upper connection platforms 140 and 150, which connect lower and upper portions of the sidewalls 100, respectively.

[0030] Each of the sidewalls 100 may be provided as an aluminum profile that is extruded in the longitudinal direction (the direction in which it is deployed and accommodated) in a -shape.

[0031] Each of the lower connection platform 140 and the upper connection platform 150 may include a transverse bar or a transverse plate installed at regular intervals along the longitudinal direction of the sidewall 100.

[0032] FIG. 4 is a perspective view illustrating a sidewall of FIG. 3 from the inside, FIG. 5 is a perspective view illustrating a state in which a reinforcing material is inserted into an insertion part of the sidewall of FIG. 3, FIG. 6 is a perspective view illustrating the sidewall, to which the reinforcing material is installed, from the outside, FIG. 7 is a front view of FIG. 6, and FIG. 8 is a cross-sectional view taken along line 8-8 of FIG. 6.

[0033] Referring to FIGS. 4 to 7, the sidewall 100 may include a side plate 110. The side plate 110 may be a vertical plate.

[0034] The sidewall 100 may include upper and lower plates 120 and 130. The upper and lower plates 120 and 130 may be horizontal plates extending inward from upper and lower sides of the side plates 110.

[0035] The sidewall 100 may include an insertion part 170. The reinforcing member 30 may be installed to be inserted into the insertion part 170 as illustrated in FIG. 5.

[0036] Referring to FIGS. 4 and 7, the insertion part 170 may include an insertion groove 171 for an inner edge. The insertion groove 171 for the inner edge may be defined along a longitudinal direction on the inner edges of the top plate 120 and the side plate 110. The inner edge may include an inner side of the top plate 120 and an upper inner side of the side plate 110.

[0037] Referring to FIGS. 4 and 7, the insertion part 170 may include an insertion rail groove 173 for the inner edge. The insertion rail groove 173 for the inner edge may be defined in both ends of the insertion groove 171 for the inner edge. The insertion rail groove 173 for the inner edge may be a -shaped groove. The insertion rail groove 173 for the inner edge may support each of both ends of the reinforcing material 30 to prevent the reinforcing material 30 from being separated inward.

[0038] Referring to FIGS. 5 and 7, the reinforcing material 30 may include a reinforcing material 31 for the inner edge. The reinforcing material 31 for the inner edge may have a shape and may be inserted and accommodated into the insertion groove 171 for the inner edge and the insertion rail groove 173 for the inner edge.

[0039] As described above, the reinforcing material 31 for the inner edge may be inserted into the insertion groove 171 for the inner edge and the insertion rail groove 173 for the inner edge to most efficiently reinforce the most vulnerable portion of the boom platform 10. Thus, while maintaining the lightness of the boom platform 10, it is possible to prevent the boom platform 10 from being sagged, twisted, or broken during the work due to external force or wind.

[0040] Furthermore, referring to FIGS. 4 to 7, the insertion part 170 may further include an insertion groove 175 for the inner side of the side plate. The insertion groove 175 for the inner side of the side plate may be a vertical groove. The insertion groove 175 for the inner side of the side plate may be defined along the longitudinal direction at an inner side near a center of the side plate 110.

[0041] In addition, the insertion part 170 may include an insertion rail groove 177 for the inner side of the side plate in a -shape. The insertion rail groove 177 for the inner side of the side plate may be defined in each of both ends of the insertion groove 175 for the inner side of the side plate.

[0042] The reinforcing material 30 may include a reinforcing material 33 for the inner side of a linear side plate. The reinforcing material 33 for the inner side of the side plate may be inserted and accommodated into the insertion groove 175 for the inner side of the side plate and the insertion rail groove 177 for the inner side of the side plate.

[0043] Referring to FIG. 6 and FIG. 8, the sidewall 100 may include an adhesive filling hole 180. The adhesive filling hole 180 may be defined in the sidewall 100 at a portion into which the reinforcing material 30 is inserted. For example, the adhesive filling hole 180 may be defined to pass through the side plate 110 and the top plate 120. The adhesive filling hole 180 may allow the inserted reinforcing material 30 to be in more close contact with the sidewall 100, thereby preventing the reinforcing material 30 from being separated in the longitudinal direction.

[0044] In addition, the sidewall 100 may include a concave passage groove 190. The concave passage groove 190 may be defined along the longitudinal direction inside the insertion part 170 so as to communicate with the adhesive filling hole 180. The concave passage groove 190 may act as a flow passage through which an adhesive filled in the adhesive filling hole 180 flows along the longitudinal direction to allow the adhesive to be quickly permeated into the reinforcing material 30.

[0045] Since the concave passage groove 190 is a groove that is recessed from the inside to the outside of the sidewall 100, a uplift part 181 may be provided and reinforced at a portion in which the adhesive filling hole 180 is defined, to reinforce the recessed groove. The uplift part 181 may be uplifted by a degree of the recess of the concave passage groove 190 to not only offset a reduction in thickness of the sidewall 100, but also define a band-shaped contact surface when slid with an adjacent boom so that the deployment and the accommodation are smooth.

[0046] Unlike the insertion part of FIG. 8, an insertion part of FIG. 8a may have an L shape and include an insertion groove 175' for the inner side of the side plate and an insertion groove 176' for the inner side of the lower plate.

[0047] In addition, the insertion part of FIG. 8a may include an insertion rail groove 177' for each of the inner sides of the side plate / lower plate at an end of the insertion groove 175' for the inner side of the side plate and at an end of the insertion groove 176' for the inner side of the lower plate.

[0048] A reinforcing material 33' of FIG. 8a may have an L shape and may be installed to be inserted into the insertion groove 175' for the inner side of the side plate, the insertion groove 176' for the inner side of the lower plate, and the insertion rail groove 177' for each of the inner sides of the side plate / lower plate.

[0049] FIG. 9 is a front view illustrating a state in which the reinforcing material 30 is riveted to the sidewall 100.

[0050] Referring to FIG. 9, the reinforcing material 30 may be mechanically coupled to the sidewall 100 by being riveted using a rivet R. The rivet R may be a blind rivet. When a rivet shaft is inserted into a rivet hole RH and then pulled with a gun, a rivet head may be generated at an opposite side to compete the riveting.

[0051] FIGS. 10 to 17 are front views according to another embodiment of FIG. 8.

[0052] FIG. 10 is similar in structure and function to FIGS. 8 and 9, but there is a difference in that an insertion part 170a and a reinforcing material 30a are integrated with each other, and others are the same, and thus, the same reference numerals are given, and detailed descriptions will be omitted.

[0053] That is, referring to FIG. 10, the insertion part 170a may include a -shaped insertion groove 171a for an inner side. The insertion groove 171a for the inner side may be integrated along a longitudinal direction at an inner side of a side plate 110 and an inner side of an upper plate 120.

[0054] The insertion part 170a may include a -shaped insertion rail groove 173a for the inner side. The insertion rail groove 173a for the inner side may be defined in each of both ends of the insertion groove 171a for the inner side.

[0055] The reinforcing material 30a may include a reinforcing material 30a for the inner side, which is integrally inserted into the insertion groove 171a for the inner side and the insertion rail groove 173a for the inner side.

[0056] Referring to FIG. 11, the insertion part 170b may include a -shaped insertion groove 170b for a hollow. The insertion groove 170b for the hollow may be integrated along a longitudinal direction inside a sidewall 100. That is, the insertion groove for the hollow 170b may include an insertion groove 171b for the hollow of the side plate 110, an insertion groove 172b for the hollow of an upper plate 120, and an insertion groove 173b for the hollow of the lower plate 130.

[0057] The reinforcing material 30b may include a -shaped reinforcing material 30b for the hollow, which is inserted into the insertion groove 170b for the hollow. That is, the reinforcing material 30b for the hollow may include a reinforcing material 31b for the hollow of the side plate 110, a reinforcing material 32b for the hollow of the upper plate 120, and a reinforcing material 33b for the hollow of the lower plate 130.

[0058] As described above, the reinforcing material 30b may be installed to be inserted into the insertion groove for the hollow 170b, which is defined inside the sidewall 100, not only the insertion may be more easy, but also strength may also be greatly improved as it is integrally surrounded.

[0059] Referring to FIG. 12, the insertion part 170c may be divided into an upper insertion groove 171c for the hollow and a lower insertion groove 173c for the hollow. That is, the upper insertion groove 171c for the hollow may be defined in a -shape inside an upper edge, and the lower insertion groove 173c for the hollow may be defined in a -shape inside a lower edge.

[0060] The reinforcing material 30c may include an upper reinforcing material 31c for the hollow, which is inserted into the upper insertion groove 171c for the hollow, and a lower reinforcing material 33c for the hollow, which is inserted into the lower insertion groove 173c for the hollow.

[0061] Referring to FIGS. 13 to 15, a sidewall 100' may include a side plate 110' and upper and lower plates 120' and 130'.

[0062] The sidewall 100' may include an insertion part 170'. A reinforcing material 30' may be installed to be inserted into the insertion part 170'.

[0063] The insertion part 170' may include an insertion groove 171' for an inner edge, an insertion rail groove 173' for the inner edge, and insertion grooves 175' and 177' for an inner side of the side plate.

[0064] In particular, each of the insertion rail groove 173' for the inner edge and the insertion rail groove 177' for the inner side of the side plate may be defined as a groove tapered at an acute angle.

[0065] Unlike the -shaped insertion rail grooves 173' and 177' , the acutely tapered insertion rail grooves 173' and 177' may further improve rigidity by maintaining a thickness T1 of the sidewall 100', which is thicker than a thickness T1 of the sidewall 100.

[0066] Likewise, the reinforcing material 30' may include a reinforcing material 31' for the inner edge and a reinforcing material 33' for the inner side of the side plate. Both ends of the reinforcing material 31' for the inner side and the reinforcing material 33' for the inner side of the side plate may also be provided as grooves tapered at an acute angle. Thus, the thickness T2 of the acutely tapered reinforcing material 30' may be maintained to be thicker than a thickness t2 of the reinforcing material 30 to further improve the rigidity.

[0067] An insertion part 170a' and a reinforcing material 30a', which are described with reference to FIG. 16, are similar in structure and function to the insertion part 170' and the reinforcing material 30' of FIG. 15, but there is a difference in that the insertion part 170a' and a reinforcing material 30a' are integrated with each other.

[0068] That is, referring to FIG. 16, the insertion part 170a' may include an insertion groove 171a' for an inner side and an insertion rail groove 173a' for the inner side.

[0069] The insertion groove 171a' for the inner side may be integrally provided along a longitudinal direction inside the side plate 110' and the upper plate 120'.

[0070] The insertion rail groove 173a' for the inner side may be defined as a groove tapered at an acute angle at each of both ends of the insertion groove 171a' for the inner side.

[0071] The reinforcing material 30a' may also include a reinforcing material 30a' for the inner side, which is inserted into the insertion groove 171a' for the inner side and the insertion rail groove 173a' for the inner side.

[0072] Both ends of the reinforcing material 30a' for the inner side may also be tapered at an acute angle.

[0073] FIG. 17 is a front view of a boom in which the reinforcing material is installed inside and outside the sidewall.

[0074] Referring to FIG. 17, a sidewall 100" may include a side plate 110'' and upper and lower plates 120" and 130''.

[0075] Like FIG. 15, an inner insertion part 170'' and an inner reinforcing material 30" may be provided inside the side plate 110''.

[0076] The inner insertion part 170'' may include an insertion groove 171'' for an inner edge, which is defined in each of inner edges of the side plate 110'' and the upper plate 120'', and an insertion rail groove 173'' for the inner side, which is defined in each of both ends of the insertion groove 171" for the inner edge and is tapered at an acute angle.

[0077] The reinforcing material 30" may include a reinforcing material 31'' for the inner edge, which is inserted into the insertion groove 171'' for the inner edge. Each of both ends of the reinforcing material 31'' for the inner edge may be tapered at an acute angle so as to be inserted into the insertion rail groove 173'' for the inner edge.

[0078] The inner insertion part 170'' may include an insertion groove 175'' for the inner side, which is defined inside a center of the side plate 110'' and an insertion rail groove 177'' for the inner side, which is defined in each of both ends of the insertion groove 175'' for the inner side and is tapered an acute angle.

[0079] The reinforcing material 30" may include a reinforcing material 33" for the inner side, which is inserted into the insertion groove 175" for the inner side. Each of both ends of the reinforcing material 31'' for the inner side may be tapered at an acute angle so as to be inserted into the insertion rail groove 177" for the inner side.

[0080] Referring to FIG. 17, an outer insertion part 170a" and an outer reinforcing material 30a" may be provided outside the side plate 110".

[0081] The outer insertion part 170a" may include an upper insertion groove 171a" for an outer side, which is defined outside an upper portion of the side plate 110'', and an upper insertion rail groove 173a" for the outer side, which is tapered at an acute angle at each of both ends thereof.

[0082] The corresponding outer reinforcing material 30a'' may include an upper outer reinforcing material 31a", which is inserted into the upper insertion groove 171a" for the outer side and the upper insertion rail groove 173a" for the outer side. Each of both ends of the upper outer reinforcing material 31a" may also be tapered at an acute angle.

[0083] In addition, the outer insertion part 170a'' may include a lower insertion groove 175a'' for an outer side, which is defined outside a lower portion of the side plate 110", and a lower insertion rail groove 177a'' for the outer side, which is tapered at an acute angle at each of both ends thereof.

[0084] The corresponding outer reinforcing material 30a'' may include a lower outer reinforcing material 33a", which is inserted into a lower insertion groove 175a'' for the outer side and a lower insertion rail groove 177a" for the outer side. Each of both ends of the lower outer reinforcing material 33a'' may also be tapered at an acute angle.

[0085] FIG. 17a is a front view illustrating a state in which the insertion part for the inner side and the insertion part for the hollow are mixed.

[0086] The insertion part for the inner side of FIG. 17a may include an insertion groove 171d for the inner side, which is defined downward from a center at the inside of the upper plate 120 and an upper end of the side plate 110 and an insertion rail groove 173d for the inner side, which is defined in each of both ends of the insertion groove 171d for the inner side.

[0087] The reinforcing material 30d for the inner side of FIG. 17a may include a reinforcing material 31d for the inner side, which is installed to be inserted into the insertion groove 171d for the inner side and the insertion rail groove 173d for the inner side.

[0088] In addition, the insertion part for the inner side of FIG. 17a may include an insertion groove for a hollow 175d, which is defined at a lower side of the side plate 110 and at the inside of the lower plate 130.

[0089] The reinforcing material 30d for the inner side of FIG. 17a may include a reinforcing material 33d for the hollow, which is installed to be inserted into the insertion groove 175d for the hollow.

[0090] FIGS. 18 and 19 are side views illustrating deployment and accommodation of a boom of a ladder truck for transporting loads.

[0091] A boom 1' of a ladder truck is similar in structure and function to the boom 1 of the crane, but there is a difference in that there is no upper connection platform connecting an upper portion of a boom platform 10', as illustrated in FIG. 20.

[0092] That is, the boom platform 10' of the ladder truck may include a sidewall 10a' and a lower connection platform 14' connecting a lower portion of the sidewall 10a'.

[0093] The sidewall 10a' may include a side plate 11' and upper and lower plates 12' and 13' extending inward from an upper side of the side plate 11'. A profile of the sidewall 10' may be extruded to fit the ladder truck, but the insertion part and the reinforcing material of the sidewall for the crane may also be applied as they are.

[0094] That is, the insertion part as illustrated in FIGS. 1 to 17 may be defined in the side plate 11' of the boom platform 10' of the ladder truck, and the reinforcing material may be installed to be inserted into the insertion part.

[0095] While the embodiments of the inventive concept have been described with reference to the specific embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.

[0096] [Description of the Symbols]1,1' :Boom10,10':Boom platform30:Reinforcing material (carbon fiber)100:Sidewall110:Side plate120,130:Upper and lower plates170:Insertion part171:Insertion part for inner edge173:Insertion rail groove for inner edge175:Insertion part for inner side177:Insertion rail groove for inner side180:Adhesive filling hole190:Concave passage groove

Examples

Embodiment Construction

[0023]Hereinafter, descriptions of following embodiments are intended to be illustrative, and those with ordinary skill in the technical field of the present disclosure pertains will be understood that the present disclosure can be carried out in other specific forms without changing the technical idea or essential features. However, in describing the present disclosure, if it is determined that detailed descriptions of related known functions or components may unnecessarily obscure the gist of the present disclosure, the detailed descriptions and specific illustrations will be omitted. Additionally, in order to facilitate understanding of the invention, the attached drawings are not drawn to scale and the dimensions of some components may be exaggerated.

[0024]The first and second terms used in this application may be used to describe various components, but the components should not be limited by the terms. Terms are only used to distinguish one component from other components.

[002...

Claims

1. A boom for aerial work equipment, comprising: sidewalls facing each other; a lower connection platform configured to connect the sidewalls to each other; and a reinforcing material installed on each of the sidewalls, wherein each of the sidewalls comprises: a side plate; upper and lower plates extending inward from upper and lower sides of the side plate, respectively; and an insertion part disposed along a longitudinal direction inside or outside the upper plate and the side plate or the lower plate and the side plate, and inserted into the insertion part.

2. The boom of claim 1, wherein the insertion part comprises: an insertion groove for an inner edge, which is defined along the longitudinal direction in each of inner edges of the upper plate and the side plate; and an insertion rail groove for the inner edge, which is defined in each of both ends of the insertion groove for the inner edge, wherein the reinforcing material comprises a reinforcing material for the inner edge, which is inserted into the insertion groove for the inner edge and the insertion rail groove for the inner edge.

3. The boom of claim 1, wherein the insertion part comprises: an insertion groove for the inner side of the side plate, which is defined along the longitudinal direction inside the side plate; and an insertion rail groove for the inner side of the side plate, which is defined in each of both ends of the insertion groove for the inner side of the side plate, wherein the reinforcing material comprises a reinforcing material for the inner side of the side plate, which is inserted into the insertion groove for the inner side of the side plate and the insertion rail groove for the inner side of the side plate.

4. The boom of claim 1, wherein the insertion part comprises: an insertion groove for the inner side, which is defined along the longitudinal direction inside the upper plate and the side plate; and an insertion rail groove for the inner side, which is defined in each of both ends of the insertion groove for the inner side, wherein the reinforcing material is inserted into the insertion groove for the inner side and the insertion rail groove for the inner side.

5. The boom of claim 1, wherein the insertion part comprises an insertion groove for a hollow, which is defined along the longitudinal direction inside the upper and lower plates and the side plate, wherein the reinforcing material is inserted into the insertion groove for the hollow.

6. The boom of claim 5, wherein the insertion groove for the hollow is divided into an upper insertion groove for the hollow and a lower insertion groove for the hollow, wherein the reinforcing material comprises an upper reinforcing material and a lower reinforcing material, which are inserted into the upper insertion groove for the hollow and the lower insertion groove for the hollow, respectively.

7. The boom of any one of claims 2 to 6, wherein each of both ends of the insertion rail groove comprises an insertion rail groove that is tapered at an acute angle, and each of both ends of the reinforcing material is tapered at an acute angle and is inserted into the insertion rail groove that is tapered at the acute angle.

8. The boom of any one of claims 2 to 6, wherein an adhesive filling hole that communicates with the insertion groove is defined in the sidewall.

9. The boom of claim 8, wherein a concave passage groove that communicates with the adhesive filling hole is defined inside the insertion groove.

10. The boom of any one of claims 2 to 6, wherein the reinforcing material is riveted to the sidewall.

Images