Goods conveying trolley convenient to climb stairs

Abstract

A freight trolley convenient to climb stairs comprises a trolley frame, wheels installed below the rear side of the trolley frame and a supporting frame arranged on the rear side of the trolley frame in a protruding mode and located on the inner sides of the two wheels. The rear surface of the supporting frame is a supporting face used for assisting the wheels to climb stairs, the supporting face is arranged up and down, and the distance between the supporting face and the frame in the front-back direction is gradually increased or equal from top to bottom. The distance between the lower end of the supporting face and the frame in the front-back direction is smaller than the distance between the rear surface of the wheel and the frame in the front-back direction. In the process of not influencing normal rolling of the wheels, the outer edges of the wheels and the supporting faces are smoothly connected in the stair climbing process, the sliding process between the supporting faces and the intersecting lines is smoothly transited to the rolling process between the wheels and the intersecting lines, and the trolley is more labor-saving and convenient in the stair climbing process.

Description

Technical Field

[0001] The invention relates to the technical field of freight handling, and in particular to a freight trolley which is convenient for climbing stairs. Background Art

[0002] A trolley is a vehicle for transporting materials. It is widely used in short-distance transport of items due to its low cost, easy operation and light weight. It can transport items over short distances in places where motor vehicles cannot be used.

[0003] Existing trolleys generally include a frame, a handle disposed on the frame, and wheels disposed under the frame. When in use, the frame is in an inclined state, and the goods are placed on the frame. The weight of the goods is transferred to the wheels, and the handle is pulled forward to carry the goods to the destination. If the ground is flat during the transportation process, it is still very convenient and labor-saving. However, if the goods are to be carried upstairs, especially when the goods are heavy, the wheels will be stuck between the horizontal and vertical planes of the stairs during the process of going upstairs. It takes a lot of effort to pull the goods and the trolley from the lower stairs to the upper stairs. The higher the floor, the more stairs there are, and the greater the labor load during the transportation process.

[0004] Therefore, how to solve the above-mentioned deficiencies in the prior art has become a subject to be studied and solved by the present invention. Summary of the invention

[0005] The object of the present invention is to provide a cargo trolley which is convenient for climbing stairs.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a cargo trolley convenient for climbing stairs, comprising a frame, wheels installed at the lower rear side of the frame, and a support frame protruding from the rear side of the frame and located inside the two wheels; The rear surface of the support frame is a support surface for assisting the wheels in climbing stairs. The support surface is arranged up and down, and the distance between the support surface and the frame in the front-to-back direction gradually increases or is equal from top to bottom; the height of the lower end of the support surface from the ground is less than the height of the upper surface of the wheel from the ground, and the distance between the lower end of the support surface and the frame in the front-to-back direction is less than the distance between the rear surface of the wheel and the frame in the front-to-back direction.

[0007] In the above scheme, when pushing the cart up the stairs, the cart is pulled upward so that the support surface of the support frame abuts against and slides against the intersection line of the horizontal plane and the vertical plane of the steps, and the height of the lower end of the support surface from the ground is less than the height of the upper surface of the wheel from the ground, and the distance between the lower end of the support surface and the frame in the front-to-back direction is less than the distance between the rear surface of the wheel and the frame in the front-to-back direction. This is to ensure that the outer edge of the wheel and the support surface are smoothly connected in the process of going up the stairs without affecting the normal rolling of the wheel, and the sliding process between the support surface and the intersection line is smoothly transitioned to the rolling process between the wheel and the intersection line. Compared with the existing technology, it saves time and effort.

[0008] In the above scheme, the support surface can be an anti-collision surface made of nylon material. Because the cart is generally made of aluminum alloy and the stairs are generally made of cement, the sliding friction between the two not only has a high friction coefficient and is laborious, but also causes wear and damage to the support surface.

[0009] A further technical solution is that the support surface forms an angle β with the plane where the frame is located, 0°≤β≤45°. After multiple tests, it is found that it is more labor-saving to pull the cart upward within this angle range.

[0010] In a further technical solution, the support frame is in an inverted U shape that is recessed backwards, and includes an upper connecting rod, a supporting rod, and a lower connecting rod that are integrally formed, wherein the upper end of the upper connecting rod is connected to the frame, the lower end of the upper connecting rod is connected to the upper end of the supporting rod, the lower end of the supporting rod is connected to the upper end of the lower connecting rod, and the lower end of the lower connecting rod is connected to the frame; wherein the rear surface of the supporting rod is the supporting surface. The design of the support frame structure not only saves the amount of profiles and reduces the cost of the cart, but also makes the cart lighter.

[0011] According to a further technical solution, a pair of support frames are provided, and the two support frames are respectively located on the left and right columns of the frame, so that the support surface and the intersection line are subjected to more uniform and stable force during the sliding process, and will not shake left and right, thereby increasing the stability of the cart when going up stairs.

[0012] According to a further technical solution, the cart further comprises two reinforcing rods for fixing the fixed axles of the two wheels, the front ends of the two reinforcing rods are respectively fixedly connected to the frame, and the rear ends are respectively fixedly connected to the left and right support frames, and the fixed axles penetrate the two reinforcing rods from the left and right directions. During the use of the cart, the total weight of the cart and the goods will eventually be transferred to the two wheels, and the fixed axles of the wheels are arranged on the reinforcing rods fixedly connected to the support frames, which increases the load-bearing capacity and stability of the fixed axles and increases the overall structural strength of the cart.

[0013] A further technical solution is that the length of the frame column is adjustable, so that the length of the column can be adjusted during the process of climbing stairs to achieve the requirements of labor saving and convenience. In addition, the user can also adjust the column to a suitable length according to height, operating habits and the length of the cargo.

[0014] A further technical solution is that the vehicle column includes a hollow lower vehicle column, an upper vehicle column inserted into the lower vehicle column, and an elastic locking piece that locks the upper vehicle column to the lower vehicle column; a positioning hole is provided on the lower vehicle column; a plurality of locking holes arranged along the length direction of the vehicle column are provided on the upper vehicle column; the elastic locking piece is connected to the lower vehicle column, and in a locked state, the elastic locking piece extends into any locking hole on the upper vehicle column through the positioning hole on the lower vehicle column.

[0015] A further technical solution is that the elastic locking piece includes a locking pin and a spring sleeved on the locking pin, one end of the spring is positioned against the locking pin, and the other end is positioned against a positioning seat, which is fixed relative to the lower column; the front end of the locking pin is a locking head, which is arranged corresponding to the positioning hole and the locking hole; a traction handle is provided in the middle of the locking pin, which drives the locking pin to retract outward to unlock the locking hole.

[0016] A further technical solution is that a plastic part is fixed at the lower end of the upper column, and the outer diameter of the plastic part is slightly smaller than the inner diameter of the lower column; the column also includes a sleeve arranged on the outer periphery of the upper column and clamped in the lower column, the inner diameter of the sleeve is smaller than the outer diameter of the plastic part, and the inner diameter of the sleeve is larger than the outer diameter of the upper column. During installation, because the handlebar and the upper column are connected by screws, the sleeve is first sleeved on the upper column and then the handlebar is installed, then the upper column is inserted downward into the lower column, and then the sleeve is clamped downward into the lower column, so that during the upper column moving up and down in the lower column, only the outer edge of the plastic part has a sliding friction with the inner wall of the lower column, avoiding a large area of ​​sliding friction between the outer wall of the upper column and the inner wall of the lower column, making the upper column more time-saving and labor-saving during the up and down displacement process. The setting of the plastic part reduces the gap between the outer wall of the upper column and the inner wall of the lower column, avoiding the situation where the gap between the two is too large, causing the column to shake, and increasing the overall stability of the cart.

[0017] According to a further technical solution, a foldable support plate is provided below the cart, which is flipped downward to be perpendicular to the frame when in the open state, and flipped upward to fit the frame when in the folded state, thereby reducing the storage space occupied in the storage state and facilitating storage.

[0018] In a further technical solution, the frame is further provided with a plurality of horizontal bars recessed backwards, each of which is fixed between the left and right vehicle pillars of the frame. The horizontal bars recessed backwards increase the convenience of loading goods on the frame on the one hand, and increase the accommodating space of the frame on the other hand.

[0019] The advantages of the present invention compared with the prior art are as follows: In this case, through the setting of the supporting surface, in the process of pushing the cart up the stairs, the supporting surface and the intersection line of the horizontal plane and the vertical plane of the steps are against and in sliding contact, and the height of the lower end of the supporting surface from the ground is less than the height of the upper surface of the wheel from the ground, and the distance between the lower end of the supporting surface and the frame in the front-to-back direction is less than the distance between the rear surface of the wheel and the frame in the front-to-back direction. Without affecting the normal rolling of the wheel, the outer edge of the wheel and the supporting surface are smoothly connected in the process of going up the stairs, and the sliding process between the supporting surface and the intersection line is smoothly transitioned to the rolling process between the wheel and the intersection line. Compared with the existing technology, the cart in this case is more labor-saving and convenient in the process of going up the stairs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attached Figure 1 An exploded view of a cart according to an embodiment of the present invention; Attached Figure 2 For attachment Figure 1 A magnified image of point A; Attached Figure 3 For attachment Figure 1 The enlarged view of point B; Attached Figure 4 This is a schematic diagram of a state where a cart goes up stairs from a side view according to an embodiment of the present invention; Attached Figure 5 This is a schematic diagram of the structure of the cart from a rear side perspective according to an embodiment of the present invention; Attached Figure 6 It is a schematic structural diagram of an elastic locking member according to an embodiment of the present invention.

[0021] In the above drawings: 1. wheel; 2. support frame; 2a. upper connecting rod; 2b. support rod; 2c. lower connecting rod; 3. supporting surface; 4. vehicle column; 4a. upper vehicle column; 4b. lower vehicle column; 5. reinforcing rod; 6. fixed shaft; 7. positioning hole; 8. locking hole; 9. locking pin; 10. spring; 11. positioning seat; 12. traction handle; 13. plastic part; 14. sleeve; 15. support plate; 16. crossbar. Implementation

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Embodiment: The present invention will be clearly described below with diagrams and detailed descriptions. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the techniques taught by the present invention without departing from the spirit and scope of the present invention.

[0023] The terms used herein are only for describing specific embodiments and are not intended to be limiting of the present invention. Singular forms such as "a", "this", "here", "this" and "the" as used herein also include plural forms.

[0024] As used herein, “connected” or “positioned” may refer to two or more components or devices being in direct physical contact with each other, or being in indirect physical contact with each other, or may refer to two or more components or devices operating or moving with each other.

[0025] The terms “including”, “having”, etc. used in this document are open-ended terms, meaning including but not limited to.

[0026] The terms used in this document generally have the ordinary meaning of each term used in this field, in the context of the case and in the specific context, unless otherwise noted. Certain terms used to describe the present invention will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present invention.

[0027] The terms "front", "back", "up", "down", "left", "right", etc. used in this article are all directional terms. In this case, they are only used to illustrate the positional relationship between the various structures, and are not used to limit the protection plan of this case and the specific direction during actual implementation.

[0028] See attached Figure 1-6 As shown, a cargo trolley convenient for climbing stairs comprises a frame, wheels 1 installed at the lower rear side of the frame, and a support frame 2 protruding from the rear side of the frame and located at the inner sides of the two wheels 1.

[0029] The rear surface of the support frame 2 is a support surface 3 for assisting the wheel 1 in climbing stairs. The support surface 3 is arranged up and down, and the distance between the support surface 3 and the frame in the front-to-back direction gradually increases or is equal from top to bottom; wherein, the support surface 3 forms an angle β with the plane where the frame is located, 0°≤β≤45°. The height of the lower end of the support surface 3 from the ground is less than the height of the upper surface of the wheel 1 from the ground, and the distance between the lower end of the support surface 3 and the frame in the front-to-back direction is less than the distance between the rear surface of the wheel 1 and the frame in the front-to-back direction.

[0030] The support frame 2 is in an inverted U-shape that is concave backwards, and includes an upper connecting rod 2a, a supporting rod 2b, and a lower connecting rod 2c that are integrally formed. The upper end of the upper connecting rod 2a is connected to the frame, the lower end of the upper connecting rod 2a is connected to the upper end of the supporting rod 2b, the lower end of the supporting rod 2b is connected to the upper end of the lower connecting rod 2c, and the lower end of the lower connecting rod 2c is connected to the frame; wherein the rear surface of the supporting rod 2b is the supporting surface 3. In order to increase the stability of the cart and avoid unstable operation during the process of climbing stairs, the support frame 2 is provided with a pair of support frames 2, and the two support frames 2 are respectively located on the left and right vehicle columns 4 of the frame.

[0031] The cart also includes two reinforcing rods 5 for fixing the fixed axles 6 of the two wheels 1. The front ends of the two reinforcing rods 5 are fixedly connected to the frame, and the rear ends are fixedly connected to the left and right support frames 2. The fixed axle 6 passes through the two reinforcing rods 5 from the left and right directions, which can enhance the bearing capacity of the fixed axle 6 and increase the overall structural strength of the cart.

[0032] The length of the frame column 4 is adjustable. Specifically, the column 4 includes a hollow lower column 4b, an upper column 4a inserted into the lower column 4b, and an elastic locking member that locks the upper column 4a to the lower column 4b; the lower column 4b is provided with a positioning hole 7; the upper column 4a is provided with a plurality of locking holes 8 arranged along the length direction of the column 4; the elastic locking member is connected to the lower column 4b, and in the locked state, the elastic locking member extends into any locking hole 8 on the upper column 4a through the positioning hole 7 on the lower column 4b. In order to make the process of adjusting the length of the upper and lower columns smoother, a plastic part 13 is fixed at the lower end of the upper column 4a, and the outer diameter of the plastic part 13 is slightly smaller than the inner diameter of the lower column 4b; the column 4 also includes a sleeve 14 arranged on the outer periphery of the upper column 4a and clamped in the lower column 4b, and the inner diameter of the sleeve 14 is smaller than the outer diameter of the plastic part 13, and the inner diameter of the sleeve 14 is larger than the outer diameter of the upper column 4a. In this way, when the upper column 4a moves up and down in the lower column 4b, only the outer edge dot-shaped protrusions of the plastic part 13 slide and rub against the inner wall of the lower column 4b, avoiding large-area sliding friction between the outer wall of the upper column 4a and the inner wall of the lower column 4b, making the upper column 4a more time-saving and labor-saving in the process of moving up and down.

[0033] A pair of elastic locking members are provided, which are respectively arranged corresponding to the left and right vehicle columns 4. The elastic locking member comprises a locking pin 9 and a spring 10 sleeved on the locking pin 9, one end of the spring 10 abuts against the locking pin 9 and the other end abuts against a positioning seat 11, and the positioning seat 11 is fixed relative to the lower vehicle column 4b; the front end of the locking pin 9 is a locking head, which is arranged corresponding to the positioning hole 7 and the locking hole 8; a traction handle 12 is provided in the middle of the locking pin 9, and the traction handle 12 drives the locking pin 9 to retract outwards to achieve the unlocking of the locking pin 9 from the locking hole 8. After unlocking, the upper vehicle column 4b can be pulled upward or downward to adjust it to the required height, and then the corresponding locking hole 8 on the upper vehicle column 4b is aligned with the positioning hole 7 of the lower vehicle column 4b, and the traction handle 12 is released to allow the locking head of the locking pin 9 to be inserted into the positioning hole 7 and the locking hole 8 at the same time, so as to achieve the locking of the upper and lower vehicle columns.

[0034] A foldable support plate 15 is also provided below the pushcart. When the support plate 15 is in an open state, it is flipped downward to be perpendicular to the frame; when it is folded, it is flipped upward and fits against the frame.

[0035] The left and right vehicle columns 4 of the vehicle frame are also provided with a plurality of threading holes (not shown in the figure), and the threading holes are arranged along the length direction of the vehicle columns 4 .

[0036] The frame is further provided with a plurality of rearwardly recessed crosspieces 17 , each of which is fixedly disposed between the left and right vehicle pillars 4 of the frame.

[0037] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A cargo trolley that is convenient for climbing stairs, characterized in that: It comprises a frame, a wheel (1) mounted on the lower rear side of the frame, and a support frame (2) protruding from the rear side of the frame and located inside the two wheels (1); The rear surface of the support frame (2) is a support surface (3) for assisting the wheel (1) in climbing stairs; the support surface (3) is arranged up and down, and the distance between the support surface (3) and the frame in the front-to-back direction gradually increases or becomes equal from top to bottom; the height of the lower end of the support surface (3) from the ground is less than the height of the upper surface of the wheel (1) from the ground, and the distance between the lower end of the support surface (3) and the frame in the front-to-back direction is less than the distance between the rear surface of the wheel (1) and the frame in the front-to-back direction.

2. The cargo trolley for easy stair climbing according to claim 1, characterized in that: The support surface (3) forms an angle β with the plane where the frame is located, 0°≤β≤45°.

3. The cargo trolley for easy stair climbing according to claim 1 or 2, characterized in that: The support frame (2) is in an inverted U-shape recessed backwards, and comprises an upper connecting rod (2a), a supporting rod (2b) and a lower connecting rod (2c) which are integrally formed; the upper end of the upper connecting rod (2a) is connected to the vehicle frame, the lower end of the upper connecting rod (2a) is connected to the upper end of the supporting rod (2b), the lower end of the supporting rod (2b) is connected to the upper end of the lower connecting rod (2c), and the lower end of the lower connecting rod (2c) is connected to the vehicle frame; wherein the rear surface of the supporting rod (2b) is the supporting surface (3).

4. The cargo trolley for easy stair climbing according to claim 3, characterized in that: The support frames (2) are provided in pair, and the two support frames (2) are respectively located on the left and right vehicle pillars (4) of the vehicle frame.

5. The cargo trolley for easy stair climbing according to claim 4, characterized in that: The cart further comprises two reinforcing rods (5) for fixing fixed shafts (6) of the two wheels (1); the front ends of the two reinforcing rods (5) are respectively fixedly connected to the vehicle frame, and the rear ends are respectively fixedly connected to the left and right support frames (2); the fixed shafts (6) penetrate the two reinforcing rods (5) from the left and right directions.

6. The cargo trolley for easy stair climbing according to claim 1, characterized in that: The length of the frame column (4) is adjustable.

7. The cargo trolley for easy stair climbing according to claim 6, characterized in that: The vehicle column (4) comprises a hollow lower vehicle column (4b), an upper vehicle column (4a) inserted into the lower vehicle column (4b), and an elastic locking member for locking the upper vehicle column (4a) onto the lower vehicle column (4b); The lower column (4b) is provided with a positioning hole (7); The upper column (4a) is provided with a plurality of locking holes (8) arranged along the length direction of the column (4); The elastic locking piece is connected to the lower column (4b), and in a locked state, the elastic locking piece extends into any locking hole (8) on the upper column (4a) via a positioning hole (7) on the lower column (4b).

8. The cargo trolley for easy stair climbing according to claim 7, characterized in that: The elastic locking member comprises a locking pin (9) and a spring (10) sleeved on the locking pin (9), one end of the spring (10) being positioned against the locking pin (9) and the other end being positioned against a positioning seat (11), the positioning seat (11) being fixed relative to the lower column (4b); The front end of the locking pin (9) is a locking head, which is arranged corresponding to the positioning hole (7) and the locking hole (8); a traction handle (12) is provided in the middle of the locking pin (9), and the traction handle (12) drives the locking pin (9) to retract outwards, so as to achieve unlocking of the locking pin (9) from the locking hole (8).

9. The cargo trolley for easy stair climbing according to claim 8, characterized in that: A plastic part (13) is fixedly provided at the lower end of the upper column (4a), and the outer diameter of the plastic part (13) is slightly smaller than the inner diameter of the lower column (4b); The vehicle column (4) further comprises a sleeve (14) arranged on the outer periphery of the upper vehicle column (4a) and clamped in the lower vehicle column (4b); the inner diameter of the sleeve (14) is smaller than the outer diameter of the plastic part (13), and the inner diameter of the sleeve (14) is larger than the outer diameter of the upper vehicle column (4a).

10. The cargo trolley for easy stair climbing according to claim 1, characterized in that: A foldable support plate (15) is also provided below the pushcart. When the support plate (15) is in an open state, it is flipped downward to be perpendicular to the vehicle frame; when it is folded, it is flipped upward to fit the vehicle frame.

11. The cargo trolley for easy stair climbing according to claim 1, characterized in that: The frame is also provided with a plurality of rearwardly recessed crosspieces (17), each of the crosspieces (17) being fixedly arranged between the left and right vehicle pillars (4) of the frame.

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