Drivable step-on ladder truck

Abstract

The invention discloses a drivable stepping ladder truck which comprises a base, a driving system, a steering system, an oil pump system, a brake and other assemblies. Forward and backward rotation of the electric hand drill provides forward and backward power for the ladder truck, a handle of the electric hand drill is rotated, the walking direction of the driving wheel is changed, and the ladder truck can rotate in any direction. When the foot pedal of the oil pump system is treaded by feet in a reciprocating manner, the ladder truck ascends slowly. After the ladder truck reaches a working position, the brake assembly is pulled well, and the two brake pads clamp the two rear fixing wheels to prevent the ladder truck from moving. When an oil return valve of the oil pump system is unscrewed, the ladder truck can descend slowly until the ladder truck falls to the lowest position. When the clutch and the brake are released, the ladder truck can be easily pushed. The guardrail frame can be folded and placed on the operation platform, and the occupied space is small when the guardrail frame is lifted and vertically placed. The ladder truck can be turned, moved, ascended and descended on the operating platform by an operator, and does not need to climb up and down frequently. The ladder truck is convenient to fold, unfold and transport, small in occupied space and wide in application range.

Description

Technical Field

[0001] This invention relates to the field of aerial work platforms, and more specifically to a drivable foot-operated aerial work platform. Background Technology

[0002] Currently, aerial work platforms mainly use either electric motor-driven wire rope or electro-hydraulic driven systems. The electric motor rotates the wire rope, raising and lowering the platform. The disadvantage is that it requires a power supply connection on-site, limiting the work area, preventing self-movement, and making it inconvenient for personnel to push. Electro-hydraulic systems use hydraulic cylinders to drive the lifting scissor supports to open and retract, raising and lowering the platform. They can also move independently using a travel motor. The disadvantages are that the electro-hydraulic system is bulky, the overall vehicle is heavy, making it unsuitable for small-site work, and the daily operating costs are high.

[0003] Traditional scaffolding is also commonly used for high-altitude operations, which requires operators to frequently climb up and down to move their positions, increasing the workload and reducing work efficiency. Alternatively, an operator may be needed to move the scaffolding from below, increasing labor costs. Summary of the Invention

[0004] To enable continuous operation in small spaces with a working surface height of less than 2 meters, suitable for home renovation, indoor and outdoor repairs, and other similar applications, and to facilitate folding and transportation, thus reducing the need for operators to frequently climb up and down and lowering construction costs, this invention provides a drivable foot-operated elevated platform.

[0005] The objective of this invention can be achieved through the following technical solutions: A driveable foot-operated step ladder includes a base, a drive system, a steering system, an oil pump system, an operating platform, a guardrail frame, a braking system, and a foot pedal linkage assembly. The drive system and steering system are fixed to one corner of the base. The oil pump system is welded to the guardrail frame to form a whole and then connected to the operating platform and the base respectively. The upper part of the braking system is located inside one side of the guardrail frame, and the lower part of the braking system is located at the rear of the base. The foot pedal linkage assembly is connected to the operating platform.

[0006] Preferred configuration: The base has one universal wheel and two fixed wheels. One side of the universal wheel has a hydraulic cylinder support rod, and one side of the fixed wheels has a brake plate rod. The base has crossbars on both the left and right sides.

[0007] Preferably, the operating platform is equipped with a scissor bracket. The lower fixed end of the scissor bracket is connected to the rear end of the crossbar, and the lower movable end is connected to the U-shaped groove at the front end of the crossbar through a first bearing. The upper fixed end of the scissor bracket is connected to the rear end of the welded part of the crossbar of the operating platform, and the upper movable end is connected to the U-shaped groove at the front end of the welded part of the crossbar of the operating platform through a second bearing. An operating platform plate is laid on the welded part of the crossbar of the operating platform, and a perforated plate is provided at the front section of the welded part of the crossbar of the operating platform.

[0008] Preferably, the guardrail frame has a folding frame on one side of the front section, and two circular plates are provided at the front end of the folding frame. The rear end is connected to the guardrail frame by two first bolts and a first anti-loosening nut. The lower end of the guardrail frame has a fixing plate. The guardrail frame is connected to the hole plate at the front end of the crossbar welding part of the operating platform by two left and right pins.

[0009] Preferably, the upper part of the steering system is provided with an outer sleeve and an inner sleeve. The inner sleeve has a waist-shaped hole, and the lower part of the outer sleeve is provided with a locking screw. The locking screw is screwed into the waist-shaped hole of the inner sleeve. The outer sleeve and the inner sleeve pass through the annular plate. The top of the outer sleeve is provided with a hand drill bracket. The lower part of the steering system is provided with a steering sleeve, which is fixed by an internal hexagonal screw and a transmission cover.

[0010] Preferably, the drive system has a hand drill at the top, which locks the upper end of a hexagonal bar with a chuck, and inserts the lower end into an outer hexagonal profile. The outer hexagonal profile and the hexagonal bar are inserted into the inner sleeve. The drive system has a small bevel gear shaft at the bottom that meshes with a large bevel gear shaft fixed in the transmission cover. The other end of the large bevel gear shaft has a small sprocket. The large sprocket is fixed to the bushing with a set screw. The bushing has a third bearing inside. The small sprocket and the large sprocket are connected by a chain. The spline of the clutch shaft meshes with the spline groove of the bushing. The keyway of the clutch shaft is connected to the drive wheel by a flat key.

[0011] Preferably, the oil pump system has a piston rod at the bottom, the end of which is connected to the end of the foot pedal. The oil pump system has an oil tank on the side and a return valve and oil pipe at the top. The oil pipe is connected to the oil inlet of the oil cylinder by threads. The top of the oil cylinder is fixed to the guardrail frame by fasteners. The bottom of the oil cylinder is fixed to the oil cylinder support rod by a second bolt and a second anti-loosening nut.

[0012] Preferably, the upper part of the braking system has a fixed plate welded to the guardrail frame, the swing arm is connected to the fixed plate through the fourth anti-loosening nut, the front side of the braking system has a swing arm limiting plate welded on, the upper hole of the connecting plate is connected to the swing arm through the fifth anti-loosening nut, the lower hole of the connecting plate is connected to the upper end of the brake line, the lower end of the brake line is connected to the brake plate welded to the brake plate rod, the steel wire extending from the brake line is connected to one end hole of the two brake plates, and the other end of the two brake plates is connected to the brake plate rod through the third bolt and the third anti-loosening nut respectively.

[0013] Preferably, the foot pedal linkage assembly has two ends that pass through the front end holes of the crossbar welding part of the operating platform, and baffles are fitted on the outside of the foot pedal linkage and fixed by cotter pins. The two sides of the foot pedal linkage are connected to the lower edge hole of the U-shaped groove at the front end of the crossbar welding part of the operating platform by tension springs.

[0014] The beneficial effects of this invention are: The aerial work platform has a simple structure, allowing a single operator to steer, move, and raise / lower the platform. It can be used in situations requiring continuous movement of the work platform with a lifting height of less than 2 meters. It boasts low construction costs, improved work efficiency, and low maintenance costs. The folded guardrail frame allows for vertical placement, minimizing space requirements. Releasing the clutch and brake allows for easy steering and movement from the ground. The platform's convenient folding and unfolding facilitates transportation and has a wide range of applications. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of the aerial work platform at a lower position. Figure 2 This is an axle-side view of the aerial work platform at a high position. Figure 3 This is a schematic diagram of the aerial work platform from the rear axle at a high position. Figure 4 This is an axle-side view of the aerial work platform in its folded state. Figure 5 This is a frontal axonometric view of the drive system. Figure 6 This is a schematic diagram of the axle side of the drive system. Figure 7 A cross-sectional view of the drive wheel engaging the clutch; Figure 8 A cross-sectional view showing the drive wheels with the clutch disengaged.

[0017] The diagram shows: 1. Base, 1.1 Casters, 1.2 Fixed wheels, 1.3 Hydraulic cylinder support rod, 1.4 Brake lever, 1.5 Crossbar; 2. Drive system, 2.1 Electric drill, 2.2 Hexagonal bar, 2.3 Outer and inner hexagonal profile, 2.4 Small bevel gear shaft, 2.5 Large bevel gear shaft, 2.6 Small sprocket, 2.7 Chain, 2.8 Large sprocket, 2.9 Set screw, 2.10 Bushing, 2.11 Third bearing, 2.12 Drive wheel, 2.13 Flat key, 2.14 Clutch shaft; 3. Steering system, 3.1 Electric drill bracket, 3.2 Outer sleeve, 3.3 Inner sleeve, 3.4 Locking screw, 3.5 Steering sleeve, 3.6 Hexagonal socket head cap screw, 3.7 Transmission cover. 4. Oil pump system; 4.1 Piston rod; 4.2 Foot pedal; 4.3 Oil cylinder; 4.4 Oil pipe; 4.5 Return valve; 4.6 Fasteners; 4.7 Oil tank; 4.8 Second bolt; 4.9 Second anti-loosening nut; 5. Operating platform; 5.1 First bearing; 5.2 Scissor bracket; 5.3 Operating platform plate; 5.4 Operating platform crossbar welded parts; 5.5 Second bearing; 5.6 Hole plate; 6. Guardrail frame; 6.1 Pin; 6.2 Circular ring plate; 6.3 Folding... Frame, 6.4 First Bolt, 6.5 First Locking Nut, 6.6 Fixing Plate, 7 Braking System, 7.1 Swing Arm, 7.2 Swing Arm Limiting Plate, 7.3 Fifth Locking Nut, 7.4 Fourth Locking Nut, 7.5 Connecting Plate, 7.6 Fixing Plate, 7.7 Brake Cable, 7.8 Brake Plate, 7.9 Third Bolt, 7.10 Third Locking Nut, 7.11 Brake Plate, 8 Foot Pedal Link Assembly, 8.1 Foot Pedal Link, 8.2 Cotter Pin, 8.3 Baffle, 8.4 Tension Spring. Detailed Implementation

[0018] like Figure 1 and 2 As shown, the operator stands on the operating platform (5.3), facing the guardrail frame (6), tightens the return valve (4.5), and repeatedly presses the foot pedal (4.2). Hydraulic oil flows from the oil tank (4.7) through the oil pipe (4.4) into the oil cylinder (4.3). The oil cylinder (4.3) lifts the guardrail frame (6), which in turn drives the operating platform crossbar welded component (5.4) to rise through the pin (6.1) and the perforated plate (5.6). A scissor bracket (5.2), a first bearing (5.1), and a second bearing (5.5) are located below the platform crossbar welded component (5.4), allowing the operating platform (5.3) to be raised smoothly along with the operator and tools. If the operator stops pressing the pedal midway, the oil pump system (4) will prevent the hydraulic oil from flowing back, achieving a locked position. When descent is required, the operator loosens the return valve (4.5), and hydraulic oil flows back from the cylinder (4.3) through the oil pipe (4.4) into the oil tank (4.7). The operating platform plate (5.3) will descend slowly or quickly depending on the degree of opening of the return valve (4.5) until it reaches the lowest position. To stop descent midway, simply tighten the return valve (4.5) again to achieve the locked position.

[0019] like Figure 5 , 6 As shown in Figures 7 and 8, the electric drill (2.1) is set to low speed and the torque is adjusted to the maximum. The electric drill (2.1) rotates forward and backward to provide power for the aerial work platform. The torque of the electric drill (2.1) is transmitted to the upper part of the drive system (2) through the hexagonal bar (2.2) and the outer circle inner hexagonal profile (2.3). The lower part of the drive system (2) is mainly composed of the small bevel gear shaft (2.4), the large bevel gear shaft (2.5), the small sprocket (2.6), the large sprocket (2.8), the bushing (2.10), the clutch shaft (2.14), and the drive wheel (2.12). The operator inserts the splined side of the clutch shaft (2.14) into the spline groove of the bushing (2.10). The torque of the electric drill (2.1) is transmitted to the clutch shaft (2.14) through the bushing (2.10), and the clutch shaft (2.14) transmits the torque to the drive wheel (2.12) through the flat key (2.13), thus rotating the drive wheel. The operator removes the splined side of the clutch shaft (2.14) from the spline groove of the bushing (2.10) to disconnect the power to the drive wheel (2.12), allowing the operator to push the machine without power to the drive wheel (2.12).

[0020] like Figure 1 , 2 As shown in Figures 1 and 6, the operator swings along the chuck axis of the electric drill (2.1). The battery casing of the electric drill (2.1) drives the electric drill bracket (3.1) and the outer sleeve (3.2) to rotate. The locking screw (3.4) at the lower end of the outer sleeve (3.2) transmits the torque to the inner sleeve (3.3). The protrusion at the lower end of the inner sleeve (3.3) and the groove at the top of the steering sleeve (3.5) fit together to achieve the function of transmitting torque. The steering sleeve (3.5) and the transmission cover (3.7) are fixed by four hexagonal screws (3.6). The torque of the operator swinging the electric drill (2.1) is finally transmitted to the transmission cover (3.7). Since the drive wheel (2.12) is fixed on the transmission cover (3.7), the drive wheel (2.12) is turned. The drive wheel (2.12) and the caster wheel (1.1) are on the same side of the aerial work platform. The drive wheel (2.12) turns and rotates, which drives the caster wheel (1.1) to turn and move, thereby realizing the turning and movement of the aerial work platform.

[0021] like Figure 3As shown, the operator rotates the swing arm (7.1) from bottom to top, and the upper end of the connecting plate (7.5) and the brake cable (7.7) is fixed upward. When the axis of the hole on the connecting plate (7.5) exceeds the rotation center of the swing arm (7.1), one side of the swing arm (7.1) abuts against the swing arm limit plate (7.2) and is fixed. At this time, the lower end of the brake cable (7.7) is also pulled up, which drives the middle of the two brake plates (7.8) to be pulled up. Under the action of the third bolt (7.9) on the brake plate rod (1.4), the outer side of the brake plate (7.8) is pressed down, which respectively jams the two fixed wheels (1.2), thereby restricting the movement of the aerial work platform.

[0022] like Figure 4 As shown, the upper part of the drive system (2) is connected to the outer hexagonal profile (2.3) and the small bevel gear shaft (2.4), and the steering system (3) is connected to the inner sleeve (3.3) and the steering sleeve (3.5). The upper part is connected to the guardrail frame (6) by means of the folding frame (6.3) and the ring plate (6.2), with the first bolt (6.4) as the axis. When the operator steps on the foot pedal linkage (8.1), the baffle (8.3) will rotate downward along the axis of the foot pedal linkage (8.1). Since there is no limit on the left side of the fixed plate (6.6), the upper part of the guardrail frame (6) together with the drive system (2) and the steering system (3) can rotate to the right along the pin (6.1) until it is placed on the operating platform plate (5.3). When the aerial work platform needs to be deployed, the guardrail frame (6), drive system (2), and upper part of steering system (3) are lifted around the pin (6.1). The baffle (8.3) rotates automatically under the pressure of the fixed plate (6.6). After the fixed plate (6.6) touches the right limit, the baffle (8.3) and foot pedal linkage (8.1) automatically return to their original positions under the action of the tension spring (8.4). The operator unfolds the folding frame (6.3), drive system (2), and upper part of steering system (3), inserts the hexagonal profile (2.3) into the small bevel gear shaft (2.4), and inserts the inner sleeve (3.3) into the steering sleeve (3.5) to complete the connection between the upper and lower parts of drive system (2) and steering system (3).

Claims

1. A driveable foot-operated step ladder, comprising a base (1), a drive system (2), a steering system (3), an oil pump system (4), an operating platform (5), a guardrail frame (6), a braking system (7), and a foot pedal linkage assembly (8), characterized in that: The drive system (2) and steering system (3) are located at one corner of the base (1). The oil pump system (4) is welded to the guardrail frame (6) to form a whole and is connected to the operating platform (5) and the base (1) respectively. The upper part of the braking system (7) is located inside one side of the guardrail frame (6), and the lower part of the braking system (7) is located at the tail of the base (1). The foot pedal linkage assembly (8) is connected to the operating platform (5).

2. The drivable foot-operated step ladder as described in claim 1, characterized in that: The base (1) has a universal wheel (1.1) and two fixed wheels (1.2) on its underside. The universal wheel (1.1) has a hydraulic cylinder support rod (1.3) on one side, and the fixed wheels (1.2) have a brake rod (1.4) on one side. The base (1) has crossbars (1.5) on both the left and right sides.

3. The drivable foot-operated step ladder as described in claims 1 and 2, characterized in that: The operating platform (5) is provided with a scissor bracket (5.2). The lower fixed end of the scissor bracket (5.2) is connected to the rear end of the crossbar (1.5), and the lower movable end is connected to the U-shaped groove at the front end of the crossbar (1.5) through the first bearing (5.1). The upper fixed end of the scissor bracket (5.2) is connected to the rear end of the operating platform crossbar welded part (5.4), and the upper movable end is connected to the U-shaped groove at the front end of the operating platform crossbar welded part (5.4) through the second bearing (5.5). The operating platform plate (5.3) is laid on the operating platform crossbar welded part (5.4), and the front section of the operating platform crossbar welded part (5.4) is provided with a perforated plate (5.6).

4. The drivable foot-operated step ladder as described in claims 1 and 3, characterized in that: The guardrail frame (6) has a folding frame (6.3) on one side of the front section. The front end of the folding frame (6.3) has two circular plates (6.2) at the top and bottom. The rear end is connected to the guardrail frame (6) by two first bolts (6.4) and a first anti-loosening nut (6.5). The lower end of the guardrail frame (6) has a fixing plate (6.6). The guardrail frame (6) is connected to the hole plate (5.6) at the front end of the crossbar welding part (5.4) of the operating platform by two left and right pins (6.1).

5. The drivable foot-operated step ladder as described in claims 1 and 4, characterized in that: The steering system (3) is provided with an outer sleeve (3.2) and an inner sleeve (3.3) at the top. The inner sleeve (3.3) is provided with a waist-shaped hole. The lower part of the outer sleeve (3.2) is provided with a locking screw (3.4). The locking screw (3.4) is screwed into the waist-shaped hole of the inner sleeve (3.3). The outer sleeve (3.2) and the inner sleeve (3.3) pass through the ring plate (6.2). The top of the outer sleeve (3.2) is provided with a hand drill bracket (3.1). The lower part of the steering system (3) is provided with a steering sleeve (3.5). The steering sleeve (3.5) is fixed by an internal hexagon screw (3.6) and a transmission cover (3.7).

6. The drivable foot-operated step ladder as described in claims 1 and 5, characterized in that: The drive system (2) is equipped with a hand drill (2.1) at the top, which locks the upper end of the hexagonal bar (2.2) with a chuck, and inserts the lower end into the outer hexagonal profile (2.3). The outer hexagonal profile (2.3) and the hexagonal bar (2.2) are inserted into the inner sleeve (3.3). The drive system (2) is equipped with a small bevel gear shaft (2.4) at the bottom and a large bevel gear shaft (2.5) fixed in the transmission cover (3.7) for meshing. The other end of the large bevel gear shaft (2.5) is equipped with a small bevel gear shaft. The sprocket (2.6) and the large sprocket (2.8) are fixed on the bushing (2.10) by the set screw (2.9). The bushing (2.10) has a third bearing (2.11) inside. The small sprocket (2.6) and the large sprocket (2.8) are connected by the chain (2.7). The spline of the clutch shaft (2.14) meshes with the spline groove of the bushing (2.10). The keyway of the clutch shaft (2.14) is connected to the drive wheel (2.12) by the flat key (2.13).

7. The drivable foot-operated step ladder as described in claims 1, 2, and 4, characterized in that: The oil pump system (4) has a piston rod (4.1) at the bottom, and the end of the piston rod (4.1) is connected to the end of the foot pedal (4.2). The oil pump system (4) has an oil tank (4.7) on the side, and a return valve (4.5) and an oil pipe (4.4) at the top. The oil pipe (4.4) is connected to the oil inlet of the oil cylinder (4.3) by threads. The top of the oil cylinder (4.3) is fixed to the guardrail frame (6) by fasteners (4.6). The bottom of the oil cylinder (4.3) is fixed to the oil cylinder support rod (1.3) by a second bolt (4.8) and a second anti-loosening nut (4.9).

8. The drivable foot-operated step ladder according to claims 1, 2 and 4, characterized in that: The upper part of the braking system (7) has a fixed plate (7.6) welded to the guardrail frame (6). The swing arm (7.1) is connected to the fixed plate (7.6) through the fourth anti-loosening nut (7.4). The front side of the braking system (7) has a swing arm limiting plate (7.2) welded on it. The upper hole of the connecting plate (7.5) is connected to the swing arm (7.1) through the fifth anti-loosening nut (7.3). The lower hole of the connecting plate (7.5) is connected to the upper end of the brake line (7.7). The lower end of the brake line (7.7) is connected to the brake plate (7.11) welded to the brake plate rod (1.4). The steel wire extending from the brake line (7.7) is connected to one end hole of the two brake plates (7.8). The other end of the two brake plates (7.8) is connected to the brake plate rod (1.4) through the third bolt (7.9) and the third anti-loosening nut (7.10).

9. The drivable foot-operated step ladder as described in claims 1 and 3, characterized in that: The foot pedal linkage assembly (8) has two ends of the foot pedal linkage (8.1) that are inserted into the front end holes of the crossbar welding part (5.4) of the operating platform. The foot pedal linkage (8.1) is fitted with baffles (8.3) on the outside and fixed by cotter pins (8.2). The two sides of the foot pedal linkage (8.1) are connected to the lower hole of the U-shaped groove at the front end of the crossbar welding part (5.4) of the operating platform by tension springs (8.4).

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