Aerial ladder and vehicle equipped with the same

Abstract

The present application is a ladder truck (3) having a ladder body (31) of multiple sections and being telescopic on a vehicle, the upper main frame (311) and the lower main frame (312) of the main frame of the ladder body (31) are all the same in cross-sectional shape, and the cross-sectional size of the upper main frame (311) or the lower main frame (312) in at least one section is the same as that of the upper main frame (311) or the lower main frame (312) in other sections. Thus, a ladder truck for a vehicle which is lighter and lower in cost than before, and a vehicle provided with the ladder truck can be provided.

Description

Technical Field

[0001] The present invention relates to a ladder with multiple sections that can be extended and retracted on vehicles such as fire trucks, and a vehicle equipped with the ladder. Background Technology

[0002] It is known that aerial ladders used on fire trucks, aerial work platforms, and other similar vehicles are capable of extension, raising, lowering, or rotating.

[0003] For example, Patent Document 1 discloses a fire ladder, which is constructed as follows: a multi-section ladder assembly is formed by the ladder sections being extended and retracted in sequence. The ladder has an upper main frame, a lower main frame, a diagonal frame connecting the two, a crossbeam connecting the lower main frames to each other, and a diagonal frame connecting the crossbeams to each other. The components are connected by welding. The lower main frame has a square tube and a bent plate sandwiched between them. The height of the bent plate is higher than the height of the square tube and protrudes upward toward the square tube. The bent plate is configured not to protrude downward toward the square tube.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2006-118246

[0005] Patent document 1 provides a low-cost, lightweight, and high-strength, reliable fire ladder, but requires further lightweighting and cost reduction of the ladder mounted on fire ladder trucks, aerial work platforms, etc. Summary of the Invention

[0006] Therefore, the object of the present invention is to provide a lightweight and low-cost ladder, and a vehicle equipped with the ladder.

[0007] The ladder of the present invention described in technical solution 1 is a ladder 3 having multiple sections 31 and extending and retracting on a vehicle. Its characteristic is that the upper main frame 311 and the lower main frame 312 of the ladder 31 have the same cross-sectional shape, and the cross-sectional dimensions of the upper main frame 311 or the lower main frame 312 in at least one section are the same as the cross-sectional dimensions of the upper main frame 311 or the lower main frame 312 in other sections.

[0008] The invention described in technical solution 2 is configured as follows: based on the ladder described in technical solution 1, the lower main frame 312 in the upper section of the lowest section is larger than the outer diameter of the telescopic cylinder 33 used for the extension and retraction of the ladder 3. The lower main frame 312 and the telescopic cylinder 33 are coaxially arranged, and the telescopic cylinder 33 is housed when the ladder 3 is reduced.

[0009] The invention described in technical solution 3 is configured as follows: based on the ladder described in technical solution 2, the lower main frame 312 for housing the telescopic cylinder 33 is composed of a single tube, and a connector connecting the upper main frame 311 and the lower main frame 312 is installed on the single tube.

[0010] The present invention described in technical solution 4 is configured as follows: based on the ladder described in technical solution 3, the connecting member is an inclined frame 314 that is inclined relative to the main frame, with one end connected to the upper main frame 311 via an inclined frame box 313 and the other end connected to the lower main frame 312 via an inclined frame box 313. The width W of the inclined frame 314 is the same in each section.

[0011] The present invention described in technical solution 5 is configured as follows: based on the ladder described in any one of technical solutions 2 to 4, the ladder body 31 has 5 sections, the cross-sectional dimensions of the upper main frame 311 and lower main frame 312 in the first section and the upper main frame 311 in the second section are the smallest in the main frame, the cross-sectional dimensions of the lower main frame 312 in the second section and the upper main frame 311 and lower main frame 312 in the third section are the second smallest in the main frame, the cross-sectional dimensions of the upper main frame 311 in the fourth section and the upper main frame 311 in the fifth section are the third smallest in the main frame, the cross-sectional dimension of the lower main frame 312 in the fifth section is the fourth smallest in the main frame, and the cross-sectional dimension of the lower main frame 312 in the fourth section is the largest in the main frame.

[0012] The present invention described in technical solution 6 is configured as follows: based on the ladder described in technical solution 5, the characteristic feature is that the thickness of the lower main frame 312 in the fourth section is less than the thickness of the lower main frame 312 in the fifth section.

[0013] The present invention described in technical solution 7 is configured as follows: based on the ladder described in any one of technical solutions 1 to 6, the upper main frame 311 and the lower main frame 312 have square cross-sectional shapes.

[0014] The invention described in technical solution 8 is configured as follows: based on the ladder described in any one of technical solutions 2 to 7, the telescopic cylinder 33 has a tube body 332 that contacts the inner surface of the lower main frame 312 when it is housed in the lower main frame 312. The tube body liner 334 is composed of a liner 334a whose length is smaller than the inner diameter of the lower main frame 312 housing the tube body 332, and another liner 334b ​​whose length is equal to the inner diameter of the lower main frame 312 housing the tube body 332. The liner 334a and the other liner 334b ​​are configured to sandwich the tube body 332, and the piping or wiring passes through the gap between the liner 334a and the lower main frame 312.

[0015] The present invention described in technical solution 9 is configured as follows: based on the ladder described in any one of technical solutions 1 to 8, it is characterized by having a lower surface roller 50 that rotates by contact with the lower surface of the lower main frame 312 when the ladder 3 is extended or retracted. The lower surface roller 50 is formed by a first part 51 and a second part 52 having a pair of rotating bodies 501 and 502 respectively adjacent to each other. A first bracket 511 on one end of the pair of rotating bodies 501 supporting the first part 51 is separated from the first bracket 512 on the other end of the pair of rotating bodies 501 supporting the first part 51. A second bracket 521 on one end of the pair of rotating bodies 502 supporting the second part 52 is separated from the second bracket 522 on the other end of the pair of rotating bodies 502 supporting the second part 52.

[0016] The present invention described in technical solution 10 is based on the ladder described in any one of technical solutions 1 to 9, characterized in that a swing suppressor 36 is provided at the rear end of the lower main frame 312 to suppress the swinging of the ladder 3 during extension and retraction. The swing suppressor 36 has: a first main body 361, which is disposed in the same section of the ladder body 31 between the guide rail 315 that guides the sliding of the ladder body 31 and the lower main frame 312; and a first secondary body 362, which is disposed in the gap between the guide rail 315 and the first main body 361 and the gap between the lower main frame 312 and the first main body 361.

[0017] The present invention described in technical solution 11 is configured as follows: based on the ladder described in technical solution 10, the swing suppression body 36 has a second main body in the same section of the ladder body 31, one end of which is connected to the guide rail 315 and the other end of which is connected to the lower main frame 312, and a second auxiliary body disposed in the gap between the guide rail 315 and the second main body in the next section of the ladder body 31.

[0018] The present invention described in technical solution 12 is configured as follows: based on the ladder described in any one of technical solutions 1 to 11, the ladder body 31 has a bending segment 37 at the front end that can be bent downwards, the bending center 37A of the bending segment 37 is located inside the ladder body 31 in the retracted state where the ladder 3 is shrunk, and the bending of the bending segment 37 is prevented by the bending center 37A abutting against the ladder body 31.

[0019] The present invention described in technical solution 13 is configured as follows: based on the ladder described in technical solution 12, the bending section 37 has a protrusion 38 at a position behind the bending center 37A, and the ladder body 31 has a supporting part 39 corresponding to the protrusion 38. When the ladder 3 is in the storage state, the protrusion 38 and the supporting part 39 are close to or in contact.

[0020] The present invention described in technical solution 14 is configured as follows: based on the ladder described in any one of technical solutions 1 to 13, characterized in that it has a ladder frame 32 supporting the rear of the ladder 3, the ladder frame 32 being divided into a lifting and lowering center body 321 located at the rear end of the ladder 3 and having a center point when the ladder 3 is lifted and lowered, and a cylinder front end connecting body 322 located in front of the lifting and lowering center body 321 and connected to the front end of the lifting and lowering cylinder 34 that lifts and lowers the ladder 3.

[0021] The vehicle of the present invention described in technical solution 15 is characterized in that it is equipped with a ladder 3 as described in any one of technical solutions 1 to 14.

[0022] According to the present invention, the weight and cost of the ladder mounted on the vehicle can be reduced. Attached Figure Description

[0023] Figure 1 This is a left-side view of a vehicle equipped with the ladder according to an embodiment of the present invention.

[0024] Figure 2 This is a cross-sectional view of the ladder.

[0025] Figure 3 This is a side view showing the ladder being scaled down and the telescopic cylinder housed within the lower main frame.

[0026] Figure 4 This is a diagram showing the telescopic cylinder unit in its retracted state.

[0027] Figure 5 This is a schematic cross-sectional view showing the telescopic cylinder housed in the lower main frame.

[0028] Figure 6 This is a diagram showing the lower surface roller.

[0029] Figure 7 This is a diagram representing the oscillation suppressor.

[0030] Figure 8 This is a diagram representing the oscillation suppressor.

[0031] Figure 9 This is a side view showing the bend in the ladder up to the second section.

[0032] Figure 10 This is a detailed diagram related to the storage of this bend section.

[0033] Figure 11 This is a side view showing the rear of the ladder. Detailed Implementation

[0034] The ladder according to the first embodiment of the present invention is a ladder with multiple sections that can extend and retract on a vehicle. The upper and lower main frames of the ladder have the same cross-sectional shape, and the cross-sectional dimensions of the upper or lower main frames in at least one section are the same as the cross-sectional dimensions of the upper or lower main frames in other sections.

[0035] According to this embodiment, by unifying the cross-sectional shape and size of the main frame as much as possible, steel used as the constituent material of the main frame can be used in common, thereby reducing the types of steel and reducing management effort and cost.

[0036] The second embodiment of the present invention is configured such that, based on the ladder involved in the first embodiment, the inner diameter of the lower main frame in the section above the lowest section is larger than the outer diameter of the telescopic cylinder used for the extension and retraction of the ladder. The lower main frame is coaxially arranged with the telescopic cylinder and the telescopic cylinder is housed when the ladder is reduced in size.

[0037] According to this embodiment, the lower main frame for storing the destination can play a role in preventing the telescopic cylinder from bending, etc. Therefore, compared with the case where the telescopic cylinder is placed outside the lower main frame, the number of parts can be reduced and the ladder can be formed into a narrow shape, thereby reducing costs and weight.

[0038] The third embodiment of the present invention is configured such that, based on the ladder involved in the second embodiment, the lower main frame for housing the telescopic cylinder is composed of a single pipe, and a connector connecting the upper main frame and the lower main frame is installed on the single pipe.

[0039] According to this embodiment, compared to the case where the lower main frame accommodating the telescopic cylinder is internally separated by two steel pieces to form a tube for accommodating the telescopic cylinder and a tube for mounting the connector, the number of parts is reduced and the processing time is reduced, thus reducing cost and weight.

[0040] The fourth embodiment of the present invention is configured such that, based on the ladder involved in the third embodiment, the connecting member is an inclined frame that is connected to the upper main frame at one end via an inclined frame box and to the lower main frame at the other end via an inclined frame box, and is inclined relative to the main frame, with the width of the inclined frame being the same in each section.

[0041] According to this embodiment, the dimensions of multiple inclined frame boxes within each section can be standardized to reduce costs. Furthermore, by standardizing the width of the inclined frames within each section, the variety of inclined frames can be reduced, thus decreasing confirmation processes and improving manufacturing efficiency compared to the past.

[0042] The fifth embodiment of the present invention is configured as follows: based on the ladder involved in any of the second to fourth embodiments, the ladder body has 5 sections. The cross-sectional dimensions of the upper and lower main frames in the first section and the upper main frame in the second section are the smallest in the main frame. The cross-sectional dimensions of the lower main frame in the second section and the upper and lower main frames in the third section are the second smallest in the main frame. The cross-sectional dimensions of the upper main frame in the fourth section and the upper main frame in the fifth section are the third smallest in the main frame. The cross-sectional dimension of the lower main frame in the fifth section is the fourth smallest in the main frame. The cross-sectional dimension of the lower main frame in the fourth section is the largest in the main frame.

[0043] According to this embodiment, a total of 10 main frames can be formed from 5 types of steel with different cross-sectional dimensions, thus effectively reducing costs.

[0044] The sixth embodiment of the present invention is configured such that, based on the ladder involved in the fifth embodiment, the thickness of the lower main frame in the fourth section is less than the thickness of the lower main frame in the fifth section.

[0045] According to this embodiment, by reducing the thickness of the lower main frame with the largest cross-sectional dimension, the required strength as the main frame can be met while reducing the weight.

[0046] The seventh embodiment of the present invention is configured such that, based on the ladder involved in any one of the first to sixth embodiments, the cross-sectional shape of the upper main frame and the lower main frame is square.

[0047] According to this embodiment, the total height of the vehicle, including the ladder, can be reduced when the ladder is in a retracted state, such as when the vehicle is in motion, and the weight can be reduced by making the lateral width of the ladder body smaller.

[0048] The eighth embodiment of the present invention is configured such that, based on the ladder involved in any one of the second to seventh embodiments, the tube body of the telescopic cylinder has a tube body gasket that contacts the inner surface of the lower main frame when it is housed in the lower main frame. The tube body gasket consists of a gasket whose length is smaller than the inner diameter of the lower main frame housing the tube body, and another gasket whose length is equal to the inner diameter of the lower main frame housing the tube body. The one gasket and the other gasket are arranged to sandwich the tube body, and the piping or wiring passes through the gap between the gasket and the lower main frame.

[0049] According to this embodiment, by effectively utilizing the limited space inside the lower main frame that houses the telescopic cylinder to configure piping and the like, the lateral width of the ladder can be minimized to achieve lightweight design.

[0050] The ninth embodiment of the present invention is configured such that, based on the ladder according to any one of the first to eighth embodiments, a lower surface roller is provided that rotates by contact with the lower surface of the lower main frame when the ladder is extended or retracted. The lower surface roller is formed by a first part and a second part having a pair of rotating bodies respectively adjacent to each other. A first bracket on one end of the pair of rotating bodies supporting the first part is separated from the first bracket on the other end of the pair of rotating bodies supporting the first part. A second bracket on one end of the pair of rotating bodies supporting the second part is separated from the second bracket on the other end of the pair of rotating bodies supporting the second part.

[0051] According to this embodiment, compared with the case where the bracket supporting one end of the rotating body and the bracket supporting the other end are directly connected by connecting structural members, fewer connecting components are used, thus reducing material costs, processing costs, and other costs, and improving work efficiency.

[0052] The tenth embodiment of the present invention is configured such that, based on the ladder according to any one of the first to ninth embodiments, a swing suppressor is provided at the rear end of the lower main frame to suppress the swinging of the ladder during extension and retraction. The swing suppressor has: a first main body disposed in the same section of the ladder body between a guide rail that guides the sliding of the ladder body and the lower main frame; and a first secondary body disposed in the gap between the guide rail and the first main body and the gap between the lower main frame and the first main body.

[0053] According to this embodiment, by inserting the first auxiliary body into the gap between the first main body and other components to fill the gap, the swaying of the ladder during extension and retraction can be effectively suppressed. Furthermore, since the first auxiliary body can be formed according to this gap, manufacturing efficiency can be improved.

[0054] The eleventh embodiment of the present invention is configured such that, based on the ladder according to the tenth embodiment, the sway suppression body has a second main body in the same section of the ladder body, one end of which is connected to the guide rail and the other end of which is connected to the lower main frame, and a second auxiliary body disposed in the gap between the guide rail and the second main body in the next section of the ladder body.

[0055] According to this embodiment, by inserting the second auxiliary body into the gap between the second main body and other components to fill the gap, the swaying of the ladder during extension and retraction can be effectively suppressed. Furthermore, since the second auxiliary body can be formed according to this gap, manufacturing efficiency can be improved.

[0056] The twelfth embodiment of the present invention is configured such that, based on the ladder involved in any one of the first to eleventh embodiments, a bending segment capable of bending downward is provided at the front end of the ladder body, and the bending center of the bending segment is located inside the ladder body in the retracted state where the ladder is shrunk, and the bending of the bending segment is prevented by the bending center abutting against the ladder body.

[0057] According to this embodiment, the total length of the ladder in its stowed state can be reduced. Furthermore, since no additional mechanism to prevent bending is required, costs and weight can be reduced.

[0058] The thirteenth embodiment of the present invention is configured such that, based on the ladder according to the twelfth embodiment, the bent section has a protrusion at a position behind the bending center, and the ladder body has a support portion corresponding to the protrusion. When the ladder is in the retracted state, the protrusion approaches or contacts the support portion.

[0059] According to this embodiment, bending of the bent section in the stowed state can be prevented more reliably.

[0060] The fourteenth embodiment of the present invention is configured such that, based on the ladder involved in any one of the first to thirteenth embodiments, a ladder frame supporting the rear part of the ladder is provided. The ladder frame is divided into a lifting and lowering center body located at the rear end of the ladder and having a center point when the ladder is lifted and lowered, and a cylinder front end connecting body located in front of the lifting and lowering center body and connected to the front end of the lifting and lowering cylinder that lifts and lowers the ladder.

[0061] According to this embodiment, compared with the conventional ladder frame that is integrally connected from the rear end of the ladder to the front end of the lifting cylinder, the amount of steel used can be reduced, and the weight and cost can be reduced.

[0062] The vehicle according to the fifteenth embodiment of the present invention is equipped with a ladder as described in any one of the first to fourteenth embodiments.

[0063] According to this embodiment, it is possible to achieve vehicle lightweighting and cost reduction.

[0064] Example

[0065] The following describes a ladder and a vehicle equipped with the ladder according to an embodiment of the present invention.

[0066] Figure 1 This is a left-side view of a vehicle equipped with the ladder involved in this embodiment.

[0067] The vehicle (firefighting ladder truck) includes: a driver's cab 1, located at the front of the vehicle and equipped with a driver's seat; a vehicle body 2, located behind the driver's cab 1; a ladder 3, which is stored in a prone position above the driver's cab 1 and the vehicle body 2; a gyro turntable 4, located at the rear of the vehicle body 2; a support frame 5, located on the gyro turntable 4 and supporting the rear end of the ladder 3; a load-bearing device 6, which supports the ladder 3 from below near the rear surface of the driver's cab 1; a basket 7, installed at the front end of the ladder 3; and hydraulic outriggers 8.

[0068] The ladder 3 has multiple ladder sections 31, which are connected to the vehicle body 2 via a ladder frame 32, a support frame 5, and a gyro turntable 4. In addition, the ladder 3 is equipped with a telescopic cylinder 33 for telescopic extension and retraction, a lifting cylinder 34 for lifting and lowering the ladder 3, and a bending cylinder 35 for adjusting the bending angle of the bending section 37.

[0069] Figure 2 This is a cross-sectional view of the trapezoid. Furthermore, since the trapezoid is symmetrical from left to right, therefore... Figure 2 Only one side is shown. Additionally, Figure 3 This is a side view showing the state where the ladder is reduced in size and the telescopic cylinder is housed within the lower main frame.

[0070] The ladder 3 involved in this embodiment has a five-section structure with a first to a fifth section, and is extended and retracted by sliding the ladder 31 using a telescopic cylinder 33. The first section is the uppermost section among the five sections when retracted, and the fifth section is the lowermost section among the five sections when retracted.

[0071] Each section of the ladder 31 includes: an upper main frame 311, which is the main frame located at the top; a lower main frame 312, which is the main frame located at the bottom; a diagonal frame 314, which connects the upper main frame 311 and the lower main frame 312 via a diagonal frame box 313; and a guide rail 315, which is positioned above the lower main frame 312 and guides the sliding of the ladder 31.

[0072] The upper main frame 311 and lower main frame 312 are formed of steel such as metal tubes, and their cross-sectional shapes are identical regardless of whether they are the same section or different sections. Furthermore, the cross-sectional dimensions of the upper main frame 311 or lower main frame 312 in at least one section are identical to those in other sections. Since the required strength and other requirements of the multi-section ladder 3 vary from section to section, conventionally, the cross-sectional shape and dimensions of the steel varied depending on which section it was used in, or whether it was used in the upper main frame 311 or the lower main frame 312. However, by satisfying the necessary strength and, as in this embodiment, unifying the cross-sectional shape and dimensions of the main frames as much as possible, the steel used as the main frame material can be shared, reducing the types of steel and thus lowering management effort and costs. For example, by pre-storing various types of steel with the same shape but different cross-sectional dimensions, when manufacturing the ladder 3, for those main frames with the same cross-sectional dimensions even if the sections are different, only one type of steel from the storage needs to be cut to a specified length for use.

[0073] Furthermore, even among vehicles with different sizes and number of sections of the ladder 3, if the cross-sectional shape of the main frame is the same, steel can be shared among many vehicles regardless of the vehicle model. In this case, for example, steel with the cross-sectional dimensions of the upper main frame 311 facing one vehicle as the third section can be used as the lower main frame 312 facing other vehicles as the second section, thus expanding the scope of shared use and further reducing costs.

[0074] In addition, the same cross-sectional dimensions of the main frame mean that the outer diameter and inner diameter are the same. When the cross-sectional shape is elliptical or rectangular, the major axis and minor axis are the same.

[0075] In Section 4, the inner diameter of the lower main frame 312 is larger than the outer diameter of the telescopic cylinder 33, and the interior is hollow with an opening on the lower surface.

[0076] The lower main frame 312 of the fourth section is configured approximately coaxially with the telescopic cylinder 33, such as... Figure 3 As shown, when the ladder 3 is reduced in size, the telescopic cylinder 33 is housed inside the lower main frame 312 of the fourth section. Thus, the lower main frame 312 of the fourth section, which houses the ladder, can partially prevent the telescopic cylinder 33 from bending. Therefore, compared to placing the telescopic cylinder 33 outside the lower main frame 312, it is possible to reduce the number of parts, form the ladder 3 with a narrower profile, and reduce costs and weight.

[0077] In addition, when the ladder 3 has 4 or fewer sections or more than 6 sections, the telescopic cylinder 33 is also housed in the lower main frame 312 above the lowest section.

[0078] like Figure 2 As shown, in this embodiment, the cross-sectional dimensions of the upper main frame 311 and lower main frame 312 in the first section and the upper main frame 311 in the second section are the same, and the cross-sectional dimension is the smallest among the main frames.

[0079] In addition, the cross-sectional dimensions of the lower main frame 312 in the second section and the upper main frame 311 and lower main frame 312 in the third section are made the same, and the cross-sectional dimension is the second smallest among the main frames.

[0080] In addition, the cross-sectional dimensions of the upper main frame 311 in the fourth section and the upper main frame 311 in the fifth section are made the same, and the cross-sectional dimension is the third smallest in the main frame.

[0081] In addition, the cross-sectional dimensions of the lower main frame 312 in the fifth section are the fourth smallest among the main frames.

[0082] In addition, the cross-sectional dimension of the lower main frame 312 in the fourth section of the housing telescopic cylinder 33 is the largest among the main frames.

[0083] Therefore, a total of 10 main frames can be formed from 5 types of steel with different cross-sectional dimensions, thus effectively reducing costs.

[0084] The upper main frame 311 and the lower main frame 312 have square cross-sectional shapes. Therefore, compared to the case where the cross-sectional shapes of the upper main frame 311 and the lower main frame 312 are rectangles that are longer in the vertical direction, even if the distance from the upper surface of the upper main frame 311 to the lower surface of the lower main frame 312 is the same, the distance between the lower surface of the upper main frame 311 and the upper surface of the lower main frame 312 can be increased. This makes it easier to ensure sufficient space for piping, wires, etc., installed between the upper main frame 311 and the lower main frame 312. Therefore, the distance from the upper surface of the upper main frame 311 to the lower surface of the lower main frame 312 can be smaller than in the case where the cross-section is a rectangle that is longer in the vertical direction. This reduces the total height of the vehicle, including the ladder 3, when the ladder 3 is in a retracted state, such as when the vehicle is in motion.

[0085] Furthermore, by making the cross-sectional shape of the upper main frame 311 and the lower main frame 312 square, compared with making the cross-sectional shape a rectangle that is longer in the left and right direction, the sections of the ladder 31 can be brought closer to each other, so the lateral width of the ladder 31 can be made smaller to reduce the weight.

[0086] The thickness of the lower main frame 312 in the fourth section is smaller than that in the fifth section. By making the thickness of the lower main frame 312 in the fourth section, which has the largest cross-sectional dimension, smaller than that in the fifth section, the required strength as a main frame can be met while reducing weight.

[0087] Furthermore, the main skeletons in the first to third sections have the same thickness, which is less than the thickness of the lower main skeleton 312 in the fourth section. Additionally, the upper main skeleton 311 in the fourth section has the same thickness as the upper main skeleton 311 in the fifth section, and this thickness is the same as the thickness of the lower main skeleton 312 in the fourth section.

[0088] like Figure 3 As shown, the inclined frame 314, serving as one of the connectors linking the upper main frame 311 and the lower main frame 312, is inclined relative to the main frame. One end is connected to the upper main frame 311 via an inclined frame box 313 located on the upper side of the lower surface of the upper main frame 311, and the other end is connected to the lower main frame 312 via an inclined frame box 313 located on the lower side of the lower main frame 312. Multiple inclined frames 314 are provided, passing through the space between the upper main frame 311 and the lower main frame 312, but the width W of the inclined frame 314 (refer to...) Figure 2 (The same applies to each section.)

[0089] In this way, by standardizing the width W of the inclined frame 314 for each section, the dimensions of the multiple inclined frame boxes 313 used for connecting the inclined frame 314 can be standardized for each section, thus reducing costs. Furthermore, even for the same section, the dimensions of the inclined frame 314 vary depending on the installation location, requiring on-site verification of dimensions to avoid errors. However, in this embodiment, by standardizing the width W of the inclined frame 314 within each section, the variety of inclined frame 314 dimensions can be reduced. Therefore, compared to the past, the time spent on dimension verification is reduced, and manufacturing efficiency is improved.

[0090] In addition, including the lower main frame 312 of the fourth section that houses the telescopic cylinder 33, each main frame is composed of a single tube, and a slanted frame 314 is installed on this single tube.

[0091] By also designing the lower main frame 312 of the fourth section that houses the telescopic cylinder 33 as a single tube, compared to, for example, the case where the lower main frame 312 that houses the telescopic cylinder 33 is internally separated by two steel members to form a tube for housing the telescopic cylinder 33 and a tube for mounting the inclined frame 314, the number of parts is reduced, and the processing time is also reduced, thus reducing costs and weight.

[0092] Figure 4 This is a diagram showing a telescopic cylinder unit in its retracted state.

[0093] As described above, for the telescopic cylinder 33, when the vehicle is in motion and the ladder 3 is retracted, its entirety is housed in the lower main frame 312 of the fourth section.

[0094] If the rod 331 of the telescopic cylinder 33 is extended from this state, causing the ladder 3 to begin to extend, the ladder body 31 will gradually slide towards the front end, and the tube 332 of the telescopic cylinder 33, which is housed in the lower main frame 312 of the fourth section, will be exposed externally. Furthermore, the rod 331 remains housed within the lower main frame 312 of the fourth section.

[0095] Furthermore, if the telescopic cylinder 33's rod 331 is retracted from the extended state of the ladder 3, causing the ladder 3 to begin to shrink, the ladder body 31 will gradually slide towards the rear end, and the tube 332 of the telescopic cylinder 33 will be covered by the lower main frame 312 of the fourth section.

[0096] Multiple rod pads 333 are installed at intervals along the length of the rod 331 of the telescopic cylinder 33. The rod pads 333 are approximately tetrahedral, and the rod 331 passes through a hole set in the center of the rod pads 333.

[0097] The rod pad 333 serves to prevent the rod 331 from bending under pressure. In addition, the rod pad 333 is sized to contact the inner surface of the lower main frame 312, which serves as the receiving destination of the rod 331, and also serves to guide the rod 331 in a manner that prevents it from contacting the lower main frame 312.

[0098] Multiple tube gaskets 334 are installed at intervals along the length of the tube body 332 of the telescopic cylinder 33. The tube gaskets 334 serve to prevent the tube body 332 from bending. In addition, the tube gaskets 334 are configured to protrude from the outer surface of the tube body 332, and when the tube body 332 is housed in the lower main frame 312 of the fourth section, it contacts the inner surface of the lower main frame 312, and also serves to guide the tube body 332 without contacting the lower main frame 312.

[0099] Figure 5 This is a schematic cross-sectional view showing the telescopic cylinder housed in the lower main frame.

[0100] Near the pipe body 332, two hydraulic pipes 40 are arranged along the pipe body 332 to supply oil flow for the operation of the telescopic cylinder 33. The hydraulic pipes 40 are fixed to the pipe body 332 by fasteners at intervals in the longitudinal direction, and are housed together with the telescopic cylinder 33 in the lower main frame 312 when the ladder body 31 is retracted.

[0101] The pipe body gasket 334 consists of a gasket 334a disposed on the upper surface of the pipe body 332 and another gasket 334b ​​disposed on the lower surface of the pipe body 332. The gasket 334a and the other gasket 334b ​​are disposed between the pipe body 332 and the positions of the two are approximately 180 degrees apart.

[0102] A gasket 334a is provided so that its lateral length is less than the inner diameter of the lower main frame 312 of the fourth section and the outer diameter of the pipe body 332, allowing the hydraulic piping 40, which is arranged parallel to the telescopic cylinder 33, to pass through the gap between the gasket 334a and the lower main frame 312. This effectively utilizes the limited internal space of the lower main frame 312 of the fourth section for piping, thereby minimizing the lateral width of the ladder 3 and achieving a lighter design. Furthermore, it can also be used, either together with or replacing the hydraulic piping 40, to allow other piping and wiring to pass through the gap between the gasket 334a and the lower main frame 312.

[0103] Furthermore, the height of one gasket 334a is such that its upper surface contacts the upper inner surface of the lower main frame 312 when the tube body 332 is housed within the lower main frame 312 of the fourth section. The lateral length of the other gasket 334b ​​is approximately equal to the inner diameter of the lower main frame 312 of the fourth section housing the tube body 332, and its height is such that its lower surface contacts the lower inner surface of the lower main frame 312 when the tube body 332 is housed within the lower main frame 312 of the fourth section. Thus, when the tube body 332 is housed within the lower main frame 312 of the fourth section, both gaskets 334a and 334b ​​contact the inner surface of the lower main frame 312 of the fourth section, thereby reliably preventing contact between the tube body 332 and the lower main frame 312.

[0104] Figure 6 This is a diagram showing the lower surface roller. Figure 6 (a) is a side view. Figure 6 (b) is a cross-sectional view in the direction of extension in a section.

[0105] Each of the second to fifth ladder sections 31 is equipped with a lower surface roller 50, which rotates by contacting the lower surface of the lower main frame 312 when the ladder 3 is extended or retracted. The lower surface roller 50 is formed by a first portion 51 having a pair of rotating bodies 501 and a second portion 52 having a pair of rotating bodies 502 adjacent to each other. The rotation axis of the rotating bodies 501 and 502 is oriented in the width direction of the lower main frame 312.

[0106] One end of the pair of rotating bodies 501 in the first part 51 is supported by a first bracket 511 on one end of a balance-shaped (generally inverted triangular) structure, and the other end of the pair of rotating bodies 501 in the first part 51 is supported by a first bracket 512 on the other end of a balance-shaped (generally inverted triangular) structure. Similarly, one end of the pair of rotating bodies 502 in the second part 52 is supported by a second bracket 521 on one end of a balance-shaped (generally inverted triangular) structure, and the other end of the pair of rotating bodies 502 in the second part 52 is supported by a second bracket 522 on the other end of a balance-shaped (generally inverted triangular) structure.

[0107] In this way, by separating the first bracket 511 on one end and the first bracket 512 on the other end without direct connection, and by separating the second bracket 521 on one end and the second bracket 522 on the other end without direct connection, compared with the case where the bracket supporting one end of the rotating body 501 or the rotating body 502 is directly connected to the bracket supporting the other end using connecting structural members, fewer connecting components are used. Therefore, material costs, processing costs and other costs can be reduced, and work efficiency can be improved.

[0108] A first bracket 511 on one end, a first bracket 512 on the other end, a second bracket 521 on one end, and a second bracket 522 on the other end are mounted on a roller frame. The roller frame includes: a central suspension portion 531, which is suspended in the width direction between the first portion 51 and the second portion 52; a first suspension portion 532, which is suspended in the width direction between a pair of rotating bodies 501 of the first portion 51; a second suspension portion 533, which is suspended in the width direction between a pair of rotating bodies 502 of the second portion 52; a support portion 534 on one end, which supports one end of the central suspension portion 531, the first suspension portion 532, and the second suspension portion 533; and a support portion 535 on the other end, which supports the other end of the central suspension portion 531, the first suspension portion 532, and the second suspension portion 533. One end of the first bracket 511 engages with one end of the first suspension part 532, and the other end of the first bracket 512 engages with the other end of the first suspension part 532. One end of the second bracket 521 engages with one end of the second suspension part 533, and the other end of the second bracket 522 engages with the other end of the second suspension part 533.

[0109] Figure 7 and Figure 8 This is a diagram representing the oscillation suppressor. Figure 7 Figure (a) and Figure 8(a) are side views. Figure 7 (b) and Figure 8 (b) is a cross-sectional view.

[0110] At the rear end of the ladder body 31 from the first to the fourth section, there are sway suppressors 36 that suppress the swaying of the ladder 3 in the vertical direction during extension and retraction.

[0111] The oscillation suppressor 36 includes a KO-shaped component 361 as a first main body, an upper rear end pad 362 and a lower rear end pad 363 as a first sub-body, and a J-shaped component 364 as a second main body and a side rear end pad 365 as a second sub-body. The KO-shaped component 361 and the J-shaped component 364 are made of, for example, SUS, and the upper rear end pad 362, the lower rear end pad 363 and the side rear end pad 365 are made of, for example, nylon.

[0112] The U-shaped component 361 is positioned with a gap between the lower main frame 312 and the guide rail 315 and is fixed by bolts. The outer surface of the U-shaped component 361 contacts the outer surface of the upper section of the lower main frame 312. The upper rear end pad 362 is configured to fill the gap between the upper surface of the U-shaped component 361 and the lower surface of the guide rail 315. The lower rear end pad 363 is configured to fill the gap between the lower surface of the U-shaped component 361 and the upper surface of the lower main frame 312.

[0113] One end of the J-shaped component 364 is connected to the outer side of the guide rail 315, and the other end is connected to the upper surface of the lower main frame 312 and is fixed by bolts. The side rear end pad 365 is configured to fill the gap between the guide rail 315 and the J-shaped component of the next section.

[0114] By inserting the first auxiliary bodies 362, 363, and the second auxiliary body 365 into the gaps between the first main body 361, the second main body 364, and other components to fill the gaps, the swaying of the ladder 3 during extension and retraction can be effectively suppressed. Furthermore, since the first auxiliary body 362 or the second auxiliary body can be formed according to this gap, manufacturing efficiency can be improved.

[0115] Figure 9 This is a side view showing the bend in the ladder up to the second section. Figure 9 (a) is when it shrinks. Figure 9 (b) is when it is elongated.

[0116] A bending section 37 capable of bending downwards is provided at the front end of the ladder body 31. Furthermore, although in Figure 9 The details have been omitted, but a hanging basket 7 is connected to the front end of the bent section 37.

[0117] The bending center 37A, which is the center point when the bending segment 37 bends, is located inside the ladder body 31, which is further inside the front end 31A of the second section, in the retracted state of the ladder 3. By pulling the bending center 37A of the bending segment 37 into a position further inside the front end 31A of the second section of the ladder body 31, the total length of the ladder 3 in the retracted state can be shortened.

[0118] In addition, the bending of the bent section 37 in the folded state is prevented by abutting against the second section of the ladder body 31, so no additional mechanism for preventing bending is required, thereby reducing cost and weight.

[0119] Figure 10 These are detailed diagrams related to the storage of bent sections. Figure 10 (a) represents the convex part, Figure 10 (b) represents the load-bearing part. Figure 10 (c) indicates the engagement state between the protrusion and the supporting part when the ladder is in its retracted state. Furthermore, Figure 10 The lower image in (a) and (b) is an enlarged view of the part enclosed by 〇 in the upper image.

[0120] The configuration is as follows: In the bending section 37, a protruding part 38 is provided at a position rear of the bending center 37A; in the second section of the ladder body 31, a supporting part 39 corresponding to the protruding part 38 is provided at a position rear of the front end 31A. If the ladder 3 is shrunk to a retracted state, then as... Figure 10As shown in (c), the protrusion 38 is close to or in contact with the support portion 39. The length of the support portion 39 is greater than the length of the protrusion 38.

[0121] Therefore, by abutting the protrusion 38 against the bearing portion 39, the downward bending movement of the bent section 37 is prevented, thus more reliably preventing the bending of the bent section 37.

[0122] Figure 11 This is a side view showing the rear of the ladder.

[0123] The ladder frame 32 supporting the rear of the ladder 3 is divided into a lifting center body 321, which has a center point for the lifting and lowering of the ladder 3, and a cylinder front connector 322, which is connected to the front end of the lifting cylinder 34 that lifts and lowers the ladder 3. The lifting center body 321 is located at the rear end of the ladder 3, and the cylinder front connector 322 is located in front of the lifting center body 321, and both are bolted to the ladder body 31.

[0124] The frame connector 323, which is connected to the support frame 5, extends downward from the lifting center body 321 and protrudes downward. The rear end of the lifting cylinder 34 is mounted on the frame connector 323.

[0125] In this way, by dividing the part of the ladder frame 32 that contacts the ladder 31 into two parts, the lifting center body 321 and the cylinder front end connecting body 322, compared with the ladder frame that is integrally connected from the rear end of the ladder 31 to the part connected to the front end of the lifting cylinder 34 as in the past, the amount of steel used can be reduced, thereby reducing weight and cost.

[0126] Industrial applicability

[0127] By incorporating the ladder of this invention, fire-fighting ladder trucks, aerial work platforms, and the like can be made lighter and their costs reduced.

[0128] Explanation of reference numerals in the attached figures

[0129] 3...ladder; 31...ladder body; 37...bending section; 37A...bending center; 311...upper main frame; 312...lower main frame; 313...slanted frame box; 314...slanted frame; 315...guide rail; 32...ladder frame; 321...lifting and lowering center body; 322...front end connector; 33...telescopic cylinder; 332...pipe body; 334...pipe body gasket; 334a...one gasket; 334b...another gasket; 34...lifting and lowering cylinder; 3 6...Swing suppressor; 361...First main body (Ko-shaped component); 362, 363...First auxiliary body (upper rear end pad, lower rear end pad); 364...Second main body (J-shaped component); 365...Second auxiliary body (side rear end pad); 38...Protrusion; 39...Bearing part; 50...Lower surface roller; 51...First part; 52...Second part; 501, 502...Rotating body; 511...First bracket; 521...Second bracket; W...Width of the oblique frame.

Claims

1. A ladder, comprising multiple sections and extendable on a vehicle, characterized in that, The upper and lower main frames of the trapezoid have identical cross-sectional shapes. The cross-sectional dimensions of the upper main frame or the lower main frame in at least one section are the same as the cross-sectional dimensions of the upper main frame or the lower main frame in other sections. The inner diameter of the lower main frame described in the previous section is larger than the outer diameter of the telescopic cylinder used for extending and retracting the ladder. The lower main frame is coaxially configured with the telescopic cylinder and houses the telescopic cylinder when the ladder is retracted.

2. The ladder according to claim 1, characterized in that, The lower main frame housing the telescopic cylinder is composed of a single tube, and a connector connecting the upper main frame and the lower main frame is installed on the single tube.

3. The ladder according to claim 2, characterized in that, The connector is an inclined frame that is connected to the upper main frame at one end via an inclined frame box and to the lower main frame at the other end via the inclined frame box, and is inclined relative to the main frame. The width of the oblique skeleton is the same in each section.

4. The ladder according to any one of claims 1 to 3, characterized in that, The ladder has 5 sections. The cross-sectional dimensions of the upper main frame and the lower main frame described in Section 1, and the upper main frame described in Section 2, are the smallest among the main frames. The cross-sectional dimensions of the lower main frame described in Section 2 and the upper main frame and lower main frame described in Section 3 are the second smallest among the main frames. The cross-sectional dimensions of the upper main frame described in Section 4 and Section 5 are the third smallest among the main frames. The cross-sectional dimension of the lower main frame described in Section 5 is the fourth smallest among the main frames. The cross-sectional dimension of the lower main frame described in Section 4 is the largest among the main frames.

5. The ladder according to claim 4, characterized in that, The thickness of the lower main frame in the fourth section is less than the thickness of the lower main frame in the fifth section.

6. The ladder according to any one of claims 1 to 3, characterized in that, The cross-sectional shape of the upper main frame and the lower main frame is square.

7. The ladder according to any one of claims 1 to 3, characterized in that, The telescopic cylinder has a tube body that contacts the inner surface of the lower main frame when it is housed in the lower main frame. The tube body gasket consists of a gasket with a length smaller than the inner diameter of the lower main frame housing the tube body, and another gasket with a length equal to the inner diameter of the lower main frame housing the tube body, wherein the first gasket and the second gasket are configured to sandwich the tube body. Piping or wiring passes through the gap between the gasket and the lower main frame.

8. The ladder according to any one of claims 1 to 3, characterized in that, It has a lower surface roller that rotates by contacting the lower surface of the lower main frame when the ladder is extended or retracted. The lower surface roller is formed by the adjacent connection of a first portion and a second portion, each having a pair of rotating bodies. The first bracket on one end of the pair of rotating bodies supporting the first part is separately disposed from the first bracket on the other end of the pair of rotating bodies supporting the first part. The second bracket on one end of the pair of rotating bodies supporting the second part is separately disposed from the second bracket on the other end of the pair of rotating bodies supporting the second part.

9. The ladder according to any one of claims 1 to 3, characterized in that, The rear end of the lower main frame is equipped with a sway suppressor to suppress the swaying of the ladder during extension and retraction. The swing suppressor has: The first main body is disposed in the same section of the ladder body between the guide rail that guides the sliding of the ladder body and the lower main frame; and The first sub-body is disposed in the gap between the guide rail and the first main body, and in the gap between the lower main frame and the first main body.

10. The ladder according to claim 9, characterized in that, The swing suppressor has a second main body in the same section of the ladder body, one end of which is connected to the guide rail and the other end of which is connected to the lower main frame, and a second auxiliary body disposed in the gap between the guide rail and the second main body in the next section of the ladder body.

11. The ladder according to any one of claims 1 to 3, characterized in that, The front end of the ladder body has a bending section that can bend downwards. The bending center of the bending section is located within the ladder body when the ladder is folded down for storage. The bending of the bent section is prevented by the bending center abutting against the ladder body.

12. The ladder according to claim 11, characterized in that, The bent section has a protrusion located behind the center of the bend. The ladder body has a support portion corresponding to the protrusion. When the ladder is in the retracted state, the protrusion is close to or in contact with the supporting part.

13. The ladder according to any one of claims 1 to 3, characterized in that, It has a ladder frame that supports the rear of the ladder. The ladder frame is divided into a lifting and lowering center body located at the rear end of the ladder and having the center point when the ladder is lifted and lowered, and a cylinder front end connecting body located in front of the lifting and lowering center body and connected to the front end of the lifting and lowering cylinder that causes the ladder to lift and lower.

14. A vehicle, characterized in that, The ladder is installed according to any one of claims 1 to 13.

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