Climbing ladder with adjustable handrail and engineering vehicle

Abstract

The utility model discloses a kind of adjustable handrails of ladder and engineering vehicle, including ladder main body, handrail fixed seat and adjustable handrail;Ladder main body is fixed on chassis, used as the walking passage between ground and machine shed;Handrail fixed seat is installed on the ladder main body, at least one upper fixed point is equipped on the handrail fixed seat;The ladder main body is installed with a lower fixed point at the just below of handrail fixed seat;Adjustable handrail is installed on the handrail fixed seat, and adjustable handrail can be moved up and down on handrail fixed seat;The bottom of adjustable handrail moves to lower fixed point, now adjustable handrail is in low position, the movement range of swing arm and slewing platform can be avoided;The bottom of adjustable handrail moves to upper fixed point, now adjustable handrail is in high position, can satisfy the grip demand when user climbs ladder main body.

Description

Technical Field

[0001] This utility model relates to a ladder with adjustable handrails, belonging to the field of engineering vehicle technology. Background Technology

[0002] Large wheeled excavators and wheeled material handlers typically have ladders at the front and rear of their chassis, allowing users to access the machine shed from the ground. However, as customer demands for excavator functionality diversify and the required digging range expands, the excavator's boom frequently moves to a lower position during digging, increasing the risk of interference with the front and rear ladders.

[0003] To avoid interference, the existing solution is to lower the height of the ladder's handrails to avoid the working range of the boom and slewing platform. However, ladders with lowered handrail heights lack suitable handholds when climbing near the top, requiring the climber to bend over and squat to achieve three-point support, resulting in low comfort and safety hazards. Summary of the Invention

[0004] To address the issue of insufficient height of the front and rear ladder handrails on the chassis of wheeled excavators and wheeled material handlers, this utility model provides a ladder with adjustable handrails. When the excavator is working, the adjustable handrails are placed in a low position to avoid the movement range of the boom and slewing platform; when the user needs to climb, the adjustable handles are placed in a high position and locked to meet the user's gripping needs.

[0005] This utility model is achieved according to the following technical solution: In a first aspect, this utility model provides a ladder with adjustable handrails, comprising: The main body of the ladder is fixed to the chassis and serves as a walking passage between the ground and the machine shed; A handrail fixing seat is installed on the ladder body, and the handrail fixing seat is provided with at least one upper fixing point; the ladder body is installed with a lower fixing point located directly below the handrail fixing seat; An adjustable handrail is installed on the handrail mounting base and can move up and down on the handrail mounting base; when the bottom of the adjustable handrail moves to the lower fixed point, the adjustable handrail is in a low position and can avoid the movement range of the boom and the slewing platform; when the bottom of the adjustable handrail moves to the upper fixed point, the adjustable handrail is in a high position and can meet the user's gripping needs when climbing the main body of the ladder.

[0006] In some embodiments, the bottom of the armrest fixing seat is provided with a downward-facing sliding groove that serves as the upper fixing point, and the bottom rod-shaped component of the adjustable armrest is inserted into the sliding groove to fix the adjustable armrest and the armrest fixing seat together.

[0007] In some embodiments, the grooving structure of the slide is as follows: after opening at the bottom edge of the handrail fixing seat, it extends vertically upward for a predetermined length to form groove I, then extends horizontally for a predetermined length to form groove II, and finally extends vertically downward for a predetermined length to form groove III; the bottom rod-shaped component of the adjustable handrail passes through groove I and groove II and is then engaged in groove III.

[0008] In some embodiments, a locking device is installed on the handrail mounting base near the slide groove for locking the bottom rod-shaped component of the adjustable handrail in the groove III.

[0009] In some embodiments, the locking device includes a baffle and a fastening member, the top of the baffle being mounted on a handrail mounting base directly above the junction of slots II and III by the fastening member, the bottom of the baffle extending to slot III, and the bottom rod-shaped member of the adjustable handrail being defined in slot III below the baffle.

[0010] In some embodiments, the baffle is hinged to the armrest mounting base by a fastening component. The bottom of the baffle has a "┐" shaped notch. By rotating the baffle with external force to fully expose the slide groove, the restriction on the bottom rod-shaped component of the adjustable armrest is released. After the external force is removed, the baffle rotates in the opposite direction under the action of gravity to return to the initial restricted position.

[0011] In some embodiments, the lower fixing point is an armrest base, and the armrest base includes: Support base, installed on the main body of the ladder; The horizontal portion of the L-shaped plate is fixed to the support base, and the bottom rod-shaped component of the adjustable handrail falls between the vertical portion of the L-shaped plate and the ladder body to restrict the rotation of the adjustable handrail in the handrail fixing base.

[0012] In some embodiments, the support base includes: The base plate is fixed to the main body of the ladder; The convex support plate has a set of bolt and nut assemblies on each of the two recessed areas on its top surface to fix it to the top surface of the base plate. The convex support plate has a groove in the middle of the top surface of the convex support plate for engaging the bottom of the adjustable handrail. The L-shaped plate is fixed to the convex support plate in the same way as one of the bolt and nut assemblies.

[0013] In some embodiments, the cross-section of the armrest fixing seat is a "U" shaped structure, and the adjustable armrest includes an armrest body and a handle. The armrest body is formed by bending a vertical circular tube several times at its upper part. The lower middle part of the circular tube is inserted into the square frame of the armrest fixing seat, and the two are fitted with a gap. The handle is installed at the bottom of the armrest body.

[0014] In some embodiments, at least one guide member is provided between the circular tube and the square frame to prevent the circular tube from swaying within the square frame, the guide member comprising: Two opposing clamps, when joined together, form a cuboid structure with a central circular hole, through which the circular tube passes. Multiple limiting blocks are fixed to the inner walls of the handrail fixing seats on the top and bottom edges of the clamp plate to fix the clamp plate.

[0015] Secondly, this utility model provides an engineering vehicle, including the aforementioned ladder with adjustable handrails.

[0016] The beneficial effects of this utility model are: This utility model provides a ladder with adjustable handrails, which makes the height of the handrails of the excavator ladder adjustable and has a locking device, while taking into account both ease of operation and safety of use.

[0017] Users can get on and off the excavator using the ladder, which provides ample support. When the ladder is not in use, the handrail can be lowered so as not to affect the excavation work. Attached Figure Description

[0018] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0019] In the attached diagram: Figure 1 This is a schematic diagram of the structure of a ladder with adjustable handrails according to the present invention; Figure 2 This is a schematic diagram of the adjustable handrail of this utility model; Figure 3 These are perspective views and front views of the handrail fixing base of this utility model (a is a perspective view, b is a front view); Figure 4 This is a cross-sectional view of the handrail fixing base of this utility model; Figure 5 This is a partial structural diagram of the handrail fixing base of this utility model; Figure 6 This is a schematic diagram of the locking device of this utility model; Figure 7 This is a schematic diagram of the structure of the armrest base of this utility model; Figure 8This is a schematic diagram of the adjustable handrail of this utility model when it is in a low position; Figure 9 This is a schematic diagram of the adjustable handrail of this utility model when it is in the high position.

[0020] Attached diagram labels: 1-Climbing ladder body, 2-Handrail fixing seat, 3-Adjustable handrail, 4-Base, 5-Guide component, 1-4-Handrail base, 2-1-Slide groove, 2-2-Locking device, 2-2-1-Baffle, 3-1-Handrail body, 3-2-Handle, 1-4-1-Base plate, 1-4-2-Convex support plate, 1-4-3-L-shaped plate, 5-1-Clamping plate, 5-2-Limiting block.

[0021] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0023] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] A ladder with adjustable handrails includes a ladder body 1, a handrail mounting base 2, and an adjustable handrail 3. The ladder body 1 is fixed to a chassis 4 and serves as a passageway between the ground and the machine shed. The handrail mounting base 2 is installed on the ladder body 1 and has at least one upper fixing point. The ladder body 1 has a lower fixing point located directly below the handrail mounting base 2. The adjustable handrail 3 is installed on the handrail mounting base 2 and can move up and down on the handrail mounting base 2. When the bottom of the adjustable handrail 3 moves to the lower fixing point, the adjustable handrail 3 is in a low position, which can avoid the movement range of the boom and the slewing platform. When the bottom of the adjustable handrail 3 moves to the upper fixing point, the adjustable handrail 3 is in a high position, which can meet the gripping needs of users when climbing the ladder body 1.

[0026] It should be noted that a set of handrail fixing seats 2 and adjustable handrails 3 are installed on each of the two sides of the ladder body 1.

[0027] The following provides a further explanation of the specific structure of the aforementioned upper fixed point.

[0028] The bottom of the armrest fixing seat 2 is provided with a downward-facing groove 2-1 that serves as an upper fixing point. The bottom rod-shaped component (i.e., handle 3-2) of the adjustable armrest 3 is inserted into the groove 2-1, fixing the adjustable armrest 3 and the armrest fixing seat 2 together.

[0029] A further embodiment is that the groove structure of the slide 2-1 is as follows: after opening at the bottom edge of the handrail fixing seat 2, it extends vertically upward for a predetermined length to form groove I, then extends horizontally for a predetermined length to form groove II, and finally extends vertically downward for a predetermined length to form groove III; the bottom rod-shaped component of the adjustable handrail 3 (i.e., handle 3-2) passes through groove I and groove II and then engages in groove III.

[0030] It should be noted that the above embodiments are only preferred embodiments of the groove structure. In actual design, the structure is not limited to the above.

[0031] In a further embodiment, a locking device 2-2 is installed on the handrail fixing seat 2 near the slide 2-1 to lock the bottom rod-shaped part (i.e., handle 3-2) of the adjustable handrail 3 into the groove Ⅲ.

[0032] The following provides a further explanation of the specific structure of the locking device described above.

[0033] The locking device 2-2 includes a baffle 2-2-1 and a fastening component. The top of the baffle 2-2-1 is mounted on the handrail fixing seat 2 located directly above the connection between slots II and III by the fastening component. The bottom of the baffle 2-2-1 extends to slot III. The bottom rod-shaped component of the adjustable handrail 3 is confined in slot III located below the baffle 2-2-1.

[0034] According to a further solution, the baffle 2-2-1 is hinged to the armrest fixing base 2 via a fastening component, and a ┐-shaped notch is provided at the bottom of the baffle 2-2-1. The baffle 2-2-1 is rotated by an external force to completely expose the chute, so as to release the limitation on the rod-shaped component at the bottom of the adjustable armrest 3 (i.e., the handle 3-2). After the external force is removed, the baffle 2-2-1 rotates reversely under the action of gravity and returns to the initial limiting position.

[0035] It should be noted that the above embodiment is only a preferred embodiment of the locking device, and is not limited to the above structure in actual design.

[0036] The specific structure of the above lower fixing point will be further described below.

[0037] The lower fixing point is an armrest base 1-4, and the armrest base 1-4 comprises a support base and an L-shaped plate 1-4-3; the support base is installed on the ladder main body 1; the horizontal part of the L-shaped plate 1-4-3 is fixed on the support base, and the rod-shaped component at the bottom of the adjustable armrest 3 (i.e., the handle 3-2) falls between the vertical part of the L-shaped plate 1-4-3 and the ladder main body 1, so as to limit the rotation of the adjustable armrest 3 in the armrest fixing base 2.

[0038] According to a further solution, the support base comprises a bottom plate 1-4-1 and a convex support plate 1-4-2; the bottom plate 1-4-1 is fixed on the ladder main body 1; the recessed areas on both sides of the top surface of the convex support plate 1-4-2 are each fixed on the top surface of the bottom plate 1-4-1 through a set of bolt and nut assemblies, and a groove is provided in the middle protruding area of the top surface of the convex support plate 1-4-2 for clamping the bottom of the adjustable armrest 3; the L-shaped plate 1-4-3 is fixed on the convex support plate together with one of the bolt and nut assemblies.

[0039] It should be noted that the above embodiment is only a preferred embodiment of the armrest base, and is not limited to the above structure in actual design.

[0040] The specific structure of the above armrest fixing base will be further described below.

[0041] The cross section of the armrest fixing base 2 is an Ω-shaped structure, the adjustable armrest 3 comprises an armrest main body 3-1 and a handle 3-2, the armrest main body 3-1 is formed by a vertical round pipe with a plurality of bending processes on the upper part thereof, the middle and lower part of the round pipe is inserted into the square frame of the armrest fixing base 2, and clearance fit is formed between the round pipe and the armrest fixing base; the handle 3-2 is installed at the bottom of the armrest main body 3-1.

[0042] In a further embodiment, at least one guide component 5 is provided between the round tube and the square frame to prevent the round tube from swaying within the square frame. The guide component 5 includes two opposing clamping plates 5-1 and multiple limiting blocks 5-2. After the two clamping plates 5-1 are joined together, they form a cuboid structure with a central circular hole, through which the round tube passes. The multiple limiting blocks 5-2 are respectively fixed to the inner walls of the handrail fixing seats 2 on the top and bottom edges of the clamping plates 5-1 to fix the clamping plates 5-1.

[0043] It should be noted that the above embodiment is only a preferred embodiment of the armrest fixing seat. In actual design, it is not limited to the structure described above.

[0044] The following describes the usage process of the ladder with adjustable handrails.

[0045] 1. Initial state The adjustable handrail 3 is placed inside the handrail fixing base 2, with its lower end resting on the handrail base 1-4. The adjustable handrail 3 is at its lowest point at this time.

[0046] 2. Extended state The user holds the handle 3-2 and lifts the adjustable armrest 3 upwards. The armrest body 3-1 slides upwards inside the armrest fixing seat 2 until the handle 3-2 moves to the starting position of the slide groove 2-1. The user continues to hold the handle 3-2 and slides it along the slide groove 2-1. When the handle 3-2 touches the baffle 2-2-1, it will push it away. Finally, the handle 3-2 falls into the end position of the slide groove 2-1. The baffle 2-2-1 returns to its initial position under the action of gravity, preventing the handle 3-2 from leaving the end position of the slide groove 2-1, thus achieving a locking effect.

[0047] 3. Reset The user pushes the baffle 2-2-1 to the side while holding the handle 3-2 and pushing it towards the starting point of the slide 2-1. After the handle 3-2 leaves the slide 2-1, it is placed on the armrest base 1-4 to complete the reset.

[0048] In summary, this utility model provides a ladder with adjustable handrails, which are mounted at the front and rear of the chassis. When the excavator is working, the adjustable handrails are placed in a low position to avoid the movement range of the boom and slewing platform; when the user needs to climb, the adjustable handles are placed in a high position and locked to meet the user's gripping needs.

[0049] The engineering vehicle provided by this utility model is described below. The engineering vehicle described below can be referred to in correspondence with the ladder with adjustable handrail described above.

[0050] The present invention provides an engineering vehicle that may include a ladder with adjustable handrails as described in any of the above embodiments.

[0051] The beneficial effects achieved by the engineering vehicle provided by this utility model are consistent with the beneficial effects achieved by the ladder with adjustable handrails provided by this utility model, so they will not be repeated here.

[0052] It should be noted that the aforementioned engineering vehicles can be large wheeled excavators and large wheeled material handlers.

[0053] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0054] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0055] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A ladder with adjustable handrails, characterized in that, include: The main body of the ladder is fixed to the chassis and serves as a walking passage between the ground and the machine shed; A handrail fixing seat is installed on the ladder body, and the handrail fixing seat is provided with at least one upper fixing point; the ladder body is installed with a lower fixing point located directly below the handrail fixing seat; An adjustable handrail is installed on the handrail mounting base and can move up and down on the handrail mounting base; when the bottom of the adjustable handrail moves to the lower fixed point, the adjustable handrail is in a low position and can avoid the movement range of the boom and the slewing platform; when the bottom of the adjustable handrail moves to the upper fixed point, the adjustable handrail is in a high position and can meet the user's gripping needs when climbing the main body of the ladder.

2. The ladder with adjustable handrail according to claim 1, characterized in that: The bottom of the handrail fixing seat is provided with a downward-facing sliding groove that serves as the upper fixing point. The bottom rod-shaped component of the adjustable handrail is inserted into the sliding groove to fix the adjustable handrail and the handrail fixing seat together.

3. A ladder with adjustable handrails according to claim 2, characterized in that: The groove structure is as follows: after opening from the bottom edge of the handrail fixing seat, it extends vertically upward for a predetermined length to form groove I, then extends horizontally for a predetermined length to form groove II, and finally extends vertically downward for a predetermined length to form groove III. The bottom rod-shaped component of the adjustable handrail first passes through groove I and groove II and then snaps into groove III.

4. A ladder with adjustable handrails according to claim 3, characterized in that: A locking device is installed on the handrail fixing seat near the slide groove to lock the bottom rod-shaped component of the adjustable handrail in the groove III.

5. A ladder with adjustable handrails according to claim 4, characterized in that: The locking device includes a baffle and a fastening component. The top of the baffle is mounted on a handrail fixing seat located directly above the connection between slots II and III via the fastening component. The bottom of the baffle extends to slot III, and the bottom rod-shaped component of the adjustable handrail is confined in slot III located below the baffle.

6. A ladder with adjustable handrails according to claim 5, characterized in that: The baffle is hinged to the handrail mounting base by a fastening component. The bottom of the baffle has a "┐" shaped notch. By rotating the baffle with external force to fully expose the slide groove, the restriction on the bottom rod-shaped component of the adjustable handrail is released. After the external force is removed, the baffle rotates in the opposite direction under the action of gravity to return to the initial restricted position.

7. A ladder with adjustable handrails according to claim 1, characterized in that, The lower fixing point is the armrest base, and the armrest base includes: Support base, installed on the main body of the ladder; The horizontal portion of the L-shaped plate is fixed to the support base, and the bottom rod-shaped component of the adjustable handrail falls between the vertical portion of the L-shaped plate and the ladder body to restrict the rotation of the adjustable handrail in the handrail fixing base.

8. A ladder with adjustable handrails according to claim 7, characterized in that, The support base includes: The base plate is fixed to the main body of the ladder; A convex support plate, wherein recessed regions on both sides of the top surface of the convex support plate are each fixed to the top surface of the bottom plate by a set of bolt and nut assemblies, a protruding region in the middle of the top surface of the convex support plate is provided with a groove for clamping the bottom of the adjustable handrail; the L-shaped plate is fixed on the convex support plate in a manner shared with one set of the bolt and nut assemblies.

9. A ladder with an adjustable handrail according to claim 1, characterized in that: The cross section of the handrail fixing seat is of a reversed Ω-shaped structure, the adjustable handrail comprises a handrail main body and a handle, the handrail main body is formed by a vertical round tube which is bent for a plurality of times at the upper part thereof, the middle and lower part of the round tube is inserted into a square frame of the handrail fixing seat, and the round tube and the square frame are in clearance fit; the handle is installed at the bottom of the handrail main body.

10. A ladder with an adjustable handrail according to claim 9, characterized in that: At least one guiding member for preventing the round tube from shaking in the square frame is provided between the round tube and the square frame, the guiding member comprises: two oppositely arranged clamping plates, which are butted together to form a square structure with a round hole in the center, and the round tube passes through the round hole; a plurality of limiting blocks, which are respectively fixed on the inner wall of the handrail fixing seat at the top edge and the bottom edge of the clamping plates, for fixing the clamping plates.

11. An engineering vehicle, characterized in that: comprising the ladder with an adjustable handrail according to any one of claims 1 to 10.

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