Tool cart with bottom support mechanism

Abstract

The utility model provides a tool car with bottom support mechanism, including the car chassis, the car chassis below four corners are fixedly installed with universal wheel, and are provided with bottom support mechanism and two opposite side ears of installation setting below, and the pin shaft passes bottom support mechanism and two side ears in proper order; The support plate fixedly installed on the four corners of the car chassis top is fixedly installed with the placing tray, and one side fixedly installed with the push -and -pull rod on two support plate tops, the utility model discloses with'pedal + pin shaft'realizes drive locking, and the bending of the waist is exempted from and has no operation obstacle, and the shaft sleeve spare angle saves the labor with the principle of lever, and reduces the operation threshold, and the middle fulcrum supports and prevents the side from turning over, and the supporting wheel adapts the ground, and the reset spring can automatically rebound, forms the complete operation closed loop, and effectively promotes the operation efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of tool cart technology, and in particular relates to a tool cart with a bottom support mechanism. Background Technology

[0002] Tool carts are commonly used transfer and storage devices in industrial production, equipment maintenance, and construction. Their core function is to facilitate the convenient movement and stable parking of tools, parts, and small equipment. As work scenarios increasingly demand higher load-bearing capacity, operational efficiency, and safety from tool carts, the bottom support mechanism, as a key component ensuring the stability of the tool cart, directly impacts its practical value through its design.

[0003] Currently, the main technical pain points of the bottom support solutions for mainstream utility vehicles on the market are as follows: Traditional tool carts mostly use four-corner manually folding outriggers or spiral lifting outriggers. The operator has to bend over and manually turn the screws to unfold and lock them. Especially when holding tools, wearing gloves, or working in a narrow space, the operation process is cumbersome, time-consuming and labor-intensive, making it difficult to meet the high-frequency switching needs of "quick parking and quick movement". Although some solutions using hydraulic or electric support can simplify the operation, the structure is complex and the manufacturing cost is high. In addition, problems such as hydraulic leakage and motor failure can easily lead to increased maintenance costs, making them unsuitable for the widespread use of small and medium-sized tool carts.

[0004] Existing support mechanisms mostly use the four corners of the tool cart as support points, which can only handle scenarios with uniform loads. When heavy items (such as large repair tools or motor components) are placed in the middle area of ​​the tool cart, the center of gravity is easily unbalanced due to the "center sinking and the four corners tilting up," resulting in insufficient contact between the support points and the ground and increasing the risk of tipping over. In addition, most support structures are designed with a fixed angle, which cannot adapt to slightly uneven ground (such as grooves in the workshop floor or gravel areas on construction sites), further reducing the reliability of the support.

[0005] Therefore, it is essential to invent a tool cart with a bottom support mechanism. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a tool cart with a bottom support mechanism, including a chassis, a bottom support mechanism, a pin, side lugs, a fixing plate, a placement tray, a push-pull rod, and casters. The casters are fixedly installed at the four corners of the chassis, and the bottom support mechanism and two oppositely arranged side lugs are installed below it. The pin passes through the bottom support mechanism and the two side lugs in sequence. The placement tray is fixedly installed on the fixing plates fixedly installed at the four corners of the chassis, and the push-pull rod is fixedly installed on one side above the two fixing plates.

[0007] Preferably, the bottom support mechanism includes a pivot shaft, a shaft assembly, a support plate, a pedal, a return spring, and support wheels. The pivot shaft is rotatably mounted at the lower center of the vehicle chassis. The shaft assembly, which is fixedly mounted on the pivot shaft, is connected to the support plate and the pedal respectively. The pedal is elastically connected to the vehicle chassis through the return spring. The support wheels are rotatably mounted at both ends of the axle fixedly mounted at the lower end of the support plate.

[0008] Preferably, one end of the pedal extends outward, and the outwardly extending end of the pedal is the pedal part, wherein the end has a through hole that allows the pin to pass through, and the side ears are located on both sides of the outwardly extending end of the pedal, and also have through holes that allow the pin to pass through.

[0009] Preferably, the angle between the axis of the support plate fixedly installed on the shaft assembly and the axis of the pedal is less than 90 degrees, and the axis of the pedal can be parallel to the ground.

[0010] Preferably, the axis of the support plate is perpendicular to the ground, an axle is fixedly installed at the lower end of the support plate, and a support wheel is rotatably installed at the end of the axle, the support wheel being able to roll in contact with the ground.

[0011] Compared with the prior art, the present invention has the following beneficial effects: This utility model uses a "pedal + pin locking" drive and locking method, which eliminates the need for the operator to bend over continuously. The operator only needs to pull out the pin and step down on the extended end of the pedal with one foot. The lever transmission between the fulcrum shaft and the shaft assembly will drive the support wheel at the lower end of the support plate to quickly touch the ground. After the support is in place, the pin is inserted, and a reliable lock can be achieved by cooperating with the through hole of the side ear and the pedal. This effectively avoids operational obstacles when holding tools or wearing gloves.

[0012] The angle between the support plate and the axis of the foot pedal of this utility model shaft kit is less than 90 degrees. According to the lever principle, the force of stepping can be amplified by 30%-50%. Even women or operators with less strength can easily trigger the support, greatly reducing the operating threshold and meeting the ergonomic and labor-saving requirements.

[0013] This utility model's bottom support mechanism uses the pivot shaft at the center of the vehicle chassis as its core. When supporting, the support plate can rotate to a state perpendicular to the ground. The support wheels directly support the load in the middle area of ​​the vehicle, effectively solving the risk of tipping over caused by the "center of gravity imbalance" of traditional four-corner supports. At the same time, the support wheels adopt a rolling contact design, which can adapt to slightly uneven ground, ensuring that the support point is always in full contact with the ground, thus improving the support reliability in complex ground environments.

[0014] This utility model uses a return spring to elastically connect the pedal to the chassis. When the support is released, simply pull out the pin, and the return spring will automatically rebound, causing the pedal, axle assembly, and support plate to return to their original positions simultaneously. The support wheel will then lift off the ground without the need for manual lifting, perfectly solving the problem of "difficulty in resetting" in traditional supports. This forms a complete closed-loop operation of "pulling out the pin - stepping on the support - inserting and locking - pulling out to reset," further improving work efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the bottom structure of this utility model.

[0017] Figure 3 This is a utility model Figure 2 A magnified schematic diagram of the structure at point A.

[0018] Figure 4 This is a schematic diagram of the bottom support mechanism of this utility model.

[0019] In the picture: 1. Chassis; 2. Bottom support mechanism; 21. Pivot shaft; 22. Shaft assembly; 23. Support plate; 24. Foot pedal; 25. Return spring; 26. Support wheel; 3. Pin shaft; 4. Side lug; 5. Fixing plate; 6. Placement tray; 7. Push-pull rod; 8. Caster wheel. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0021] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for 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 the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0022] As attached Figure 1 To be continued Figure 4 As shown: This utility model provides a tool cart with a bottom support mechanism, including a chassis 1, a bottom support mechanism 2, a pin 3, side lugs 4, a fixing plate 5, a placement tray 6, a push-pull rod 7, and casters 8. The casters 8 are fixedly installed at the four corners of the chassis 1, and the bottom support mechanism 2 and two oppositely arranged side lugs 4 are installed below it. The pin 3 passes through the bottom support mechanism 2 and the two side lugs 4 in sequence. The placement tray 6 is fixedly installed on the fixing plate 5 fixedly installed at the four corners of the chassis 1, and the push-pull rod 7 is fixedly installed on one side above the two fixing plates 5.

[0023] Furthermore, the bottom support mechanism 2 mainly consists of a fulcrum shaft 21, a shaft assembly 22, a support plate 23, a foot pedal 24, a return spring 25, and a support wheel 26. The fulcrum shaft 21 is rotatably mounted in the middle position below the chassis 1 via two symmetrically arranged deep groove ball bearings. The outer ring of the bearings is interference-fitted with the pre-set mounting holes on the chassis 1, while the inner ring is transition-fitted with the fulcrum shaft 21, ensuring that the fulcrum shaft 21 can rotate flexibly and that radial runout is controlled within 0.1mm. The shaft assembly 22 is a one-piece cast steel structure. Its central hole is connected to the fulcrum shaft 21 via a flat key and welded for synchronous rotation. The two sides of the shaft assembly 22 are rigidly connected to the upper end of the support plate 23 and the middle of the foot pedal 24 via bolts, respectively. The connecting surfaces are all textured with anti-slip material and coated with thread-locking adhesive to prevent loosening over long-term use. The pedal 24 is forged from 6061 aluminum alloy. Its end is connected to one end of the return spring 25 via a hook. The return spring 25 is a high-strength carbon steel tension spring. The other end is fixed to a pre-set lifting lug under the chassis 1 with bolts. In its natural state, the pedal 24 can be held in the initial position. The support plate 23 is formed by bending Q235 steel plate. A 40Cr axle is welded to the lower end. Support wheels 26 are rotatably mounted on both ends of the axle via tapered roller bearings. The outer ring of the support wheel 26 is made of wear-resistant rubber, and the inner ring is a cast iron hub, ensuring stable contact with the ground when supported and allowing for rolling adjustment with slight vehicle movement.

[0024] Furthermore, the end of the pedal 24 furthest from the shaft assembly 22 extends horizontally outward for a length of 150-200mm. This extended end serves as the pedal part, and its surface is roughened by sandblasting and covered with an anti-slip rubber sleeve to increase friction during pedaling. A through hole with a diameter 0.5mm larger than the pin 3 is provided at the center of the pedal part, using a clearance fit to ensure that the pin 3 can pass through smoothly. The side ears 4 are two symmetrically arranged Q235 steel plates, which are vertically fixed to the side of the chassis 1 by welding and located on both sides of the extended end of the pedal 24. The side ears 4 also have through holes coaxial with the through holes of the pedal 24, and the diameter of the holes is the same as the through holes on the pedal 24. When the pedal 24 is pressed down to a specific position, the three through holes can be completely aligned, facilitating the insertion of the pin 3 to achieve locking and fixation.

[0025] Furthermore, the support plate 23 and pedal 24, which are fixedly mounted on the axle assembly 22, form an angle of 60°-80° (less than 90 degrees) between their axes in the initial state. This angle design reduces the pedaling force through leverage, improving ease of operation. The connection points between the support plate 23 and the axle assembly 22, and between the pedal 24 and the axle assembly 22, are reinforced by welding with reinforcing ribs to ensure that they do not deform under stress. When the pedal 24 is not subjected to external force and the return spring 25 is in its natural state, the axis of the pedal 24 can remain parallel to the ground, and the support wheel 26 is suspended in the air, which does not affect the normal driving of the vehicle.

[0026] Furthermore, when the pedal 24 is pressed down, the axle assembly 22 drives the support plate 23 to rotate downward around the fulcrum shaft 21 until the axis of the support plate 23 can remain perpendicular to the ground. At this time, the support plate 23 is in its maximum support state. A 20mm diameter axle is fully welded to the lower end of the support plate 23. Both ends of the axle extend 50mm beyond the sides of the support plate 23. Support wheels 26 are installed at the ends through axle shoulders and retaining springs. The support wheels 26 use double-row angular contact ball bearings, which can withstand radial and axial loads. The contact width of its outer surface with the ground is not less than 30mm, ensuring that the support wheels 26 can make stable rolling contact with the ground when the vehicle is parked or under maintenance, distributing the weight of the vehicle and facilitating fine-tuning of the vehicle's position.

[0027] The working principle is as follows: First, when the tool cart is driving normally, the bottom support mechanism 2 is in the initial state: the return spring 25 pulls the pedal 24, making the axis of the pedal 24 parallel to the ground. At this time, the support plate 23 is lifted under the drive of the axle assembly 22, and the support wheel 26 is suspended. The tool cart can move by the universal wheels 8 under the chassis 1. The operator can push the tool cart by the push-pull rod 7. The placement tray 6 is used to carry the tools, and the fixing plate 5 supports the placement tray 6.

[0028] Secondly, when the tool cart needs to be supported, the operator steps down on the extended end of the pedal 24. The pedal 24 rotates around the fulcrum shaft 21 and stretches the return spring 25. At the same time, the shaft assembly 22 rotates synchronously with the fulcrum shaft 21, causing the support plate 23 to flip downward until the axis of the support plate 23 is perpendicular to the ground. The support wheel 26 contacts the ground and bears part of the weight. At this time, the through hole on the pedal 24 is aligned with the through holes on the side ears 4 on both sides.

[0029] Then, the pin 3 is passed through the through holes of the side ear 4 and the pedal 24 in sequence to lock the pedal 24 and keep the bottom support mechanism 2 in a supported state.

[0030] Finally, when the support needs to be released, pull out the pin 3, the return spring 25 retracts and resets, pull the pedal 24 to rotate in the opposite direction, and drive the support plate 23 to flip upward through the shaft assembly 22 and the fulcrum shaft 21, so that the support wheel 26 is suspended again, the tool cart returns to a movable state, and can move flexibly again through the universal wheels 8.

[0031] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A tool cart with a bottom support mechanism, characterized in that, The chassis includes a chassis (1), a bottom support mechanism (2), a pin (3), side lugs (4), a fixing plate (5), a placement tray (6), a push-pull rod (7), and casters (8). The casters (8) are fixedly installed at the four corners of the chassis (1), and the bottom support mechanism (2) and two oppositely arranged side lugs (4) are installed below it. The pin (3) passes through the bottom support mechanism (2) and the two side lugs (4) in sequence. The placement tray (6) is fixedly installed on the fixing plate (5) fixedly installed at the four corners of the chassis (1), and the push-pull rod (7) is fixedly installed on one side above the two fixing plates (5).

2. A tool cart with a bottom support mechanism as described in claim 1, characterized in that: The bottom support mechanism (2) includes a pivot shaft (21), a shaft assembly (22), a support plate (23), a pedal (24), a return spring (25), and a support wheel (26). The pivot shaft (21) is rotatably mounted at the lower center of the chassis (1). The shaft assembly (22) fixedly mounted on the pivot shaft (21) is connected to the support plate (23) and the pedal (24) respectively. The pedal (24) is elastically connected to the chassis (1) through the return spring (25). The support wheel (26) is rotatably mounted on both ends of the axle fixedly mounted at the lower end of the support plate (23).

3. A tool cart with a bottom support mechanism as described in claim 2, characterized in that: One end of the pedal (24) extends outward, and the end of the pedal (24) extending outward is the stepping part, wherein the end is provided with a through hole that allows the pin (3) to pass through. The side ears (4) are located on both sides of the pedal (24) extending outward, and are also provided with through holes that allow the pin (3) to pass through.

4. A tool cart with a bottom support mechanism as described in claim 3, characterized in that: The included angle between the axis of the support plate (23) and the pedal (24) fixedly installed on the shaft assembly (22) is less than 90 degrees, and the axis of the pedal (24) can be parallel to the ground.

5. A tool cart with a bottom support mechanism as described in claim 4, characterized in that: The axis of the support plate (23) is perpendicular to the ground. An axle is fixedly installed at the lower end of the support plate (23), and a support wheel (26) is rotatably installed at the end of the axle. The support wheel (26) can roll in contact with the ground.

Images