WO2019035733A1

WO2019035733A1 - Collapsible cart

Info

Publication number: WO2019035733A1
Application number: PCT/RU2017/000967
Authority: WO
Inventors: Дмитрий Алексеевич КУЗНЕЦОВ
Original assignee: Дмитрий Алексеевич КУЗНЕЦОВ
Priority date: 2017-08-14
Filing date: 2017-12-25
Publication date: 2019-02-21

Abstract

The invention relates to the field of hand-operated transport means and can be used for transporting goods. A collapsible cart comprises a container having a handle, said container being mounted on a chassis. The container is pivotally connected to the chassis such that the chassis can be rotated about a shaft that runs along the edge of the bottom of the container, and the container has support lugs extending downward from the front end of the container, at the opposite end from the pivotal connection between the container and the chassis. The chassis includes an upper U-shaped frame and a lower U-shaped frame, two pairs of struts that are pivotally connected to the frames and that connect the frames on both sides of the container, each pair of struts forming a parallel linkage on each side, and an H-shaped brace consisting of a U-shaped part and two parts that are pivotally connected by one of their ends to the U-shaped part from both sides of a crossbar. The brace is pivotally connected by its upper ends to the back wall of the container and by its lower ends to the lower frame; closer to the front edge of the frame, the container is connected by a spring to one of the struts of the chassis. The result achieved by the invention is a decrease in the vertical dimensions of the cart when folded as a result of the chassis being collapsible.

Description

FOLDING CART

Technical field

The invention relates to manual means for transportation and can be used to transport goods (purchases) from their location, offers for sale (store shelves) to the vehicle of the buyer, for example, a car, then in the folded state, along with its contents in the vehicle the buyer, for example, in the trunk or body, and transportation from the vehicle to the place of discharge of the contents of the truck.

The level of technology

Known trolley embedded in the trunk of a car (patent for invention RU 2372236 dated 04.18.2008), which is designed for collecting and transporting piece packages, mainly when purchasing goods in the supermarket, containing a cargo basket with legs, with piano wheels. Two shafts are attached to the carrying body of the trolley in the sliding supports, on the protruding ends of which the right and left control handles and short levers are rigidly fixed, connected to the spring shock absorber, respectively, right and left. The diagonal legs are rigidly fixed on the respective shafts, and the other diagonally located pair of legs sits on the shafts hinged on the sliding bushes. Each pair of legs on one side of the supporting body is connected by means of rods that pivotally connect the legs and a short lever on one side. The legs are folded into the baskets of the cargo basket by means of the body, and the trolley is rigidly attached to the carrying body. baskets additional rollers for inserting baskets into the trunk of a car.

The disadvantage of the trolley is a complex mechanism for folding the legs, including levers, shafts, sliding bushings and traction. In addition, the body of the cargo basket has niches designed for foldable legs. These niches are made by reducing the internal volume (capacity) of the cargo basket. A cargo basket with protruding inside surfaces is less convenient for storing in it any objects, including goods in the store. Additional rollers for inserting the basket into the trunk of the car are rigidly attached to the carrying body of the basket. This design requires a ramp for racking the cart into the trunk of the car, which complicates the design.

Known folding trolley containing capacity (basket), cantilever mounted on the chassis, including two horizontal beams with wheels and pivotally connected with them and with the rear of the tank vertical stands, as well as an electric drive that folds the chassis (US 2014369801 A1, 12/18/2014) .

The cart has the following disadvantages. The cantilever arrangement of the tank relative to the support (chassis) significantly increases the requirements for the support structure strength, which leads to its complication and weighting. In this case, the design has low stability and rigidity in the longitudinal plane. Left and right supports are not constructively interconnected. This leads to a decrease in the overall rigidity of the structure and stability in the transverse plane. Multistep trolley folding procedure involves several steps with unlocking and lifting each support separately. This reduces the ease of use of the cart. The complexity and variety of various necessary components of the structure, such as racks, rollers, shock absorbers, springs, clamps, worm gear motor, power supply system, etc. greatly complicates the design, increases its cost, and also reduces the reliability and maintainability of the trolley.

Closest to the proposed is a foldable carriage containing a container mounted on a base having legs with wheels, the container is connected to the base pivotally with the possibility of rotation of the base around an axis passing along the edge of the bottom of the container, so that in the folded state at least the base of the base is located on the outer side of each of the two opposite walls of the container, and the container has downwardly directed support lugs on the side opposite to the hinged connection with the base (RU 168969 U1, published Feb 28, 2017) In the trolley there are no accessories (ramp) for loading it into the trunk of a car due to the direct interaction of the support lugs with the trunk of the car. In addition, the cart has a simple design by reducing the number of elements of the folding mechanism, and also has a larger useful volume due to the fact that the folded legs are placed outside the container.

The disadvantage of the cart is that when folded, the height of the cart may be at least ^ι ∆ from the height of the cart in the unfolded state. This imposes significant restrictions either on the height of the load of the trolley or on the dimensions (height) of the luggage compartment of the vehicle into which the trolley is loaded. .

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Summary of Invention

The technical problem solved by the proposed trolley is that with an increased loading height of the trolley (the boot floor level of most crossovers and SUVs is 700 - 750 mm), make the dimensions of the trolley in the folded state be the same or even smaller, especially its height (up to 400 mm). This would make the cart suitable for the vast majority of cars - from SUVs and crossovers - to hatchbacks and sedans.

The technical problem is solved by a folding cart containing a container with a handle mounted on a chassis, with which the container is connected pivotally with the possibility of rotating the chassis around an axis extending along the edge of the bottom of the container, the capacity having downward supporting lugs from the front side opposite to the hinged connection with the chassis, at the same time, according to the utility model, the chassis includes an upper U-shaped frame pivotally connected to the tank, a lower U-shaped frame on which the wheels are mounted, two pairs of pillars pivotally connected to the frame connecting the frames on both sides of the tank with a pair of racks on each side with the formation of parallelogram mechanisms, and an H-shaped brace consisting of a U-shaped part, and two parts pivotally connected at their ends with a U-shaped part on both sides from the crossbar, while the strut is pivotally connected by its upper ends to the container from the rear wall, and its lower ends to the lower frame closer to the front edge of the lower frame than the junction of the racks to the lower frame, while the capacitance is connected by a spring (or two on both sides of the trolley) with one of the landing gear legs, which is stretched in the unfolded position of the trolley.

In addition, to reduce friction when the trolley is loaded into the vehicle and when it is unloaded, at least one bearing lug has a roller at the end.

The technical result achieved by the proposed technical solution is to reduce the size of the cart in the folded state in height due to the implementation of the folding chassis.

List of drawings

FIG. 1 shows the cart in the unfolded state, general view.

FIG. 2 - the same, side view.

FIG. 3 - the same, rear view.

FIG. 4 - trolley when loading in the trunk of the car, in the process of folding the chassis.

FIG. 5 - the same, in the process of turning the chassis.

FIG. 6 - the same, in the folded state.

An example embodiment of the invention

Foldable trolley contains container 1, for example, in the form of a basket, which can be made of metal, plastic, wood or other suitable material. The container 1 is pivotally connected to the chassis with the possibility of rotation of the chassis around the axis 2, passing along the edge of the bottom of the container 1. The chassis includes an upper U-frame 3, pivotally connected to capacity 1, and a lower U-frame 4 on which the wheels 5 are mounted. The crossbars of both frames 3 and 4 are located on the front side of the cart, and on the back side of the frame do not have a crossbar for the container 1 to freely move when the cart is folded. Frames 3 and 4 are connected to the sides racks, a pair of racks 6 and 7 on each side, with the formation of a parallelogram mechanism on each side of the cart. Racks 6 and 7 form with the sides of the lower frame 4 sharp corners with the tops facing the rear ends of the frame 4.

The cart also includes a folding H-shaped strut

8, consisting of a U-shaped part 9, pivotally connected at its ends with a tank 1 with its rear wall, and two lower parts 10, pivotally connected at its upper ends with a U-shaped part 8 on both sides of its crossbar, which serves as a handle 11 In another embodiment, the lower part of the strut 8 may be made U-shaped and pivotally connected to the two upper parts (not shown in the drawings). The strut 8 is provided with a lock (not shown in the drawings), keeping it from collapsing in the unfolded position of the carriage. With their lower ends, the lower parts 10 are connected to the lower frame 4 in places located closer to the front edge of the lower frame 4 than the junction of the posts 5, 6 with the lower frame. In this case, the lower parts 10 of the strut 8 form an acute angle with the lateral sides of the lower frame 4, the apex of which is directed toward the front edge of the frame 4. The container 1 is connected by a spring 12 to one of the landing gear 6. In the unfolded state of the cart, the spring 12 is stretched. There may be two springs 12 on both sides of the cart.

The chassis is designed so that the distance between the side parts of the frames 3, 4 and racks 5, 6, located on opposite sides of the tank 1, is greater than the width of the tank 1, so that when the chassis rotates around the axis 2, they are located outside the tank 1. The possibility of rotational movement the base 3 and the possibility of rotational movement of the tank 1 are mutually limited to the structures of the base 3 and tank 1. To ensure the possibility of bringing the trolley into the unfolded state (“capacity on top of the chassis”) and enabling the trolley to be folded in, between the position for the trolley in the unfolded state (“capacity on top of the chassis”) and the position of the trolley in the folded state, the angle of rotation of the chassis relative to capacity 1 is about 180 degrees. The container 1 has a handle 13 designed to control the cart.

In order to ensure that the trolley is loaded on a surface higher than the surface on which the wheels 5 are located, for example, in the luggage compartment of a vehicle (for example, a car), the trolley is equipped with at least two corner support lugs 14. The projections 14 are directed downwards and preferably made on the lower part (bottom) of the container 1 in the place of its junction to the side walls and the front wall of the container 1 opposite to the rear wall of the container 1, on the side of which there are 2 swivel points of the container 1 s erhney 3 frame chassis. To reduce friction when used as a support, at least one of the projections 14 is provided with a roller 15.

The cart is used as follows.

In the unfolded state of the cart capacity 1 (basket) rests on the axis 2, the upper frame 3 of the chassis and the strut 8, which is fixed in the unfolded state.

When loading a trolley on a surface that is higher than the surface receiving the impact from the wheels 5, for example, in the luggage compartment of the vehicle, the cart is brought to the vehicle, press the handle 13 to raise the front part of the cart, bring the supporting lugs 14 to the loading surface. Holding the container 1 with one hand on the handle 13, The user simultaneously unscrews the strut 8 and pulls it by the handle 11 towards itself and upwards, turning it relative to the container 1. Due to the energy of the spring 12, the chassis rotates on axis 2 relative to the container 1 and at the same time folds with its parallelogram mechanisms.

When the chassis is rotated approximately 180 degrees, the cart becomes compact, its dimensions are comparable to the dimensions of tank 1, so that it can be loaded onto the surface of the vehicle further forward and / or turning it around a vertical axis passing through the right or left front support lugs 14.

When unloading the trolley, all actions are carried out in the reverse order: the folded cart is turned on one of the supporting lugs 14, the chassis is rotated 180 degrees by the handle 11 until it is unfolded and the container 1 is supported on the axle 2 and the upper frame 3, the cart is lowered to two backs the wheels 5, remove the support lugs 14 from the loading surface and lower the carriage to the support on all the wheels 5.

Thus, the overall dimensions of the trolley in the folded state are close to the useful volume of capacity 1, which allows efficient use of the space inside the vehicle or the storage location of the trolley.

In addition, the design of the cart allows you to load the cart with its contents from the unfolded position on the chassis to the folded position in the trunk of the vehicle with almost one movement, without taking your hands off the handle of the cart 13 and the handle 11 of the brace 8.

At the same time loading is fast and convenient, since significant weight carts with contents are immediately transferred to the loading surface, and the applied efforts are short-term.

Claims

Claim

1. A foldable trolley containing a container with a handle mounted on a chassis, with which the container is connected pivotally with the possibility of rotating the chassis around an axis extending along the edge of the bottom of the container, the container having downward protrusions from the front side opposite to the hinged connection with the chassis, which is different the fact that the chassis includes an upper U-shaped frame pivotally connected to the tank, a lower U-shaped frame on which wheels are mounted, two pairs of pillars pivotally connected to the frames and connecting the frames on either side of e bones on a pair of struts on each side with the formation of a parallelogram mechanism, and an H-shaped strut consisting of a U-shaped part, and two parts pivotally connected at their ends with a U-shaped part on both sides of the crossbar, while the strut is hingedly connected with their upper ends with a container on the rear wall side, and their lower ends with the lower frame closer to the front edge of the lower frame than the junction of the racks with the lower frame, while the capacitance is connected by a spring to one of the chassis struts.

2. A trolley according to claim 1, characterized in that at least one supporting protrusion has a roller at the end.