RU2149786C1 - Folding hand trolley - Google Patents

Abstract

FIELD: transport engineering; trolleys for hand carriage of loads. SUBSTANCE: folding hand trolley has carrying frame 4 with bracket 7 hinged forward, U-shaped bracket 1 with folding handle 6, lower runners 2 and front support hinge-connected with wheel axle, all these members forming non-rigid three-dimensional body, being coupled by horizontal hinge joints. Lower runners are directed down-wards from wheel axle and along rising line to front support. U- shaped bracket rigidly coupled in bottom with wheels is directed tangentially to wheel rim and is provided with stops and locks in top and bottom of carrying frame for putting horizontal hinge joints out of operation and providing rigidity of body and with oval bodies with detachable closed crawler-type belts made two-layer, outer layer being made of flexible material, for instance, rubber and inner layer, from cross rounded-off hard pins made, for instance, of metal and secured to layer at a distance from each other. Locks for stops are made in form of freely fitted oval rings. Carrying frame has cover installed in the rear on horizontal hinge joints. EFFECT: provision of smooth travel when negotiating stairways and obstacles. 4 cl, 9 dwg

Description

 The invention relates to trackless vehicles for the manual transportation of household goods.

 Hand carts manufactured by industry, as well as those for which patents have been granted, but they have not yet been implemented, significantly facilitate the life of a person in everyday life. However, they are still far from perfect. Every day we see how difficult it is for a person with a hand truck to transport goods along the stairs, when crossing the street and entering the city transport. The cart jumps on the steps of the stairs, causing an additional load on the person’s hands, and sometimes you just need to drag it along with the load like a suitcase or backpack, which older people can’t do. Inconvenient in the operation of handcarts is the fact that when fully loaded, even on a level road, there is a lot of pressure on its hand on the hands of a person. Equally important are the minimum dimensions of a folded hand truck, especially when stored in cramped household conditions and transported, for example, in a car, compartment of a train car, etc. etc.

 The following are some analogues of handcarts registered in the world. So in Russia, a patent was issued for a hand-held folding trolley for N 2076820 C 1 dated 04/10/97, consisting of a frame with running wheels, having a cargo support platform with stops, support legs and couplings on them. To fold the handcart, it is necessary to perform a number of preliminary manipulations, including removing the support legs from the couplings and installing them between the bench seat and the handle-bracket.

 Such a technical solution to reduce the dimensions of a hand truck when folding is cumbersome, requires complete disconnection of parts and their installation in a new position, which will require a relatively long time.

 The authors of the patent did not solve questions of facilitating the transportation of goods along the stairs.

 According to US patent 5064720 from 11/15/96, a portable folding trolley is proposed. The handle bracket and the loading platform, installed between the wheels with the help of a connecting hinge in the form of an axis, are folded together without leaving the dimensions of the wheels.

 Its disadvantages are the impossibility of placing goods on the platform that are larger than the width of the trolley, and the inconvenience of transporting goods along flights of stairs due to the collision of wheels with steps. In addition, when the trolley is fully loaded, the pressure of the handle bracket on the hands of a person will be quite large.

 In France, according to patent N 2582606 dated 12/05/86 a hand truck with smooth movement along the stairs is proposed.

 This is achieved by installing rail guides on the handle of the trolley at the level of the wheel rim.

 The disadvantages of this device are the lack of the same guides in the front of the hand truck, the difficulty of solving the effect of sliding along the steps at the back due to the presence of a handle and rail for this purpose. In addition, the specified hand truck cannot be folded during storage and allows increased wear of the steps due to the friction of the steel handle on concrete, wood and other materials of which the stairs are made.

 The closest analogue is the "Folding Trolley", known from the application N 94024247/28, class. 62 V 1/18, published July 10, 1996, which contains a carrier frame, wheels, lower runners and a U-shaped bracket with a folding handle. The supporting frame is pivotally connected to a U-shaped bracket, to which lower runners are pivotally connected, which are not directly connected to the axle of the wheels. When using the well-known trolley, a person spends less physical effort and travel time, since it allows you to slide like a sled when passing stairs, for example, underground passages.

 A disadvantage of the known trolley is that the runners provide a slight reduction in impact when the trolley moves and in only one direction, and in addition, the runners are not directly connected to the axis of the wheels, the hand truck on single steps, for example long transitions, will jump, which reduces the smooth effect movement.

 When friction of metal parts on the corners of the stairs can be observed increased wear of the latter and an unpleasant knock from a collision.

The basis of the invention is the task of ensuring the possibility of smooth movement in two directions, namely both during the descent and during the lifting of the trolley, which makes it easy to overcome almost all obstacles along the way, namely:
- steps on the stairs of transitions, including single,
- any ditches on footpaths,
- level differences between the platform and the floor of the passenger car,
- when boarding a city transport.

 Thus, the proposed invention makes it possible to transport a hand truck loaded at home into a train or subway car without removing the load and raising or lowering the truck.

 In addition, the objective of the proposed invention is to ensure the stability of the trolley and the increase in the volume of transported cargo, which is ensured by the location of the cargo on the platform of the hand truck between the wheels.

 A folding hand truck is proposed, which comprises a supporting non-rigid body supporting frame with a front hinged bracket, a U-shaped bracket with a folding handle pivotally connected to the front axle of the wheels and lower runners directed from the wheels downward and in an ascending line to the front support connected by horizontal hinges in the lower part with lower runners, and in the upper part with the supporting frame, which is connected by horizontal hinges with the top of the U-shaped bracket vertically directed tangentially to the wheel rim, rigidly connected at the bottom with wheels and having stops at the top and bottom with clamps on the supporting frame to turn off horizontal joints from work and ensure body rigidity, moreover, oval bodies with removable closed tracks of caterpillar type are installed on the U-shaped bracket.

 Caterpillar tracks can be made of two layers, the outer layer of which is made of a flexible material, such as rubber, and the inner layer of transverse rounded hard fingers attached to it at a distance from each other, for example, of metal.

 At the same time, the clamps for the stops are made in the form of freely installed oval rings.

 In addition, the supporting frame has a lid mounted on the top at the rear on horizontal hinges.

 An option has been developed to reduce the adverse effects of friction of the U-shaped bracket against the corners of the steps of the stairs in the direction of reducing their wear, the noise produced during this and, as a result of these circumstances, the physical efforts of the handcart.

 In FIG. 1 shows a folding hand truck with an elastic bag inside the body.

 In FIG. 2 shows a folding hand truck without an elastic bag (rear view).

 In FIG. 3 shows a folding hand truck (top view).

 In FIG. 4 shows a folding hand truck (side view) before folding.

 In FIG. 5 shows a folding hand truck (side view) after folding.

 In FIG. 6 shows a folding hand truck (side view) with a hinged forward bracket and a load on it.

In FIG. 7 shows the passage of a folding hand truck along the stairs from top to bottom:
a) the leading folding hand truck is located behind it;
b) the lead folding hand truck is in front of it.

 In FIG. 8 shows a side view of the installation of a caterpillar mover on the U-shaped bracket).

 In FIG. Figure 9 shows the installation of a caterpillar mover on the U-shaped bracket (rear view).

 The technical solution of the proposed folding hand trolley is compared to similar existing samples of medium complexity. The components that make it up are mastered by industry; moreover, the developed layout of a folding hand truck for 70% consists of parts in production. The technology is extremely simple. For enterprises that produce handcarts with a loading capacity of 10 - 50 kg, this type of product can be mastered especially quickly.

 Folding hand truck (Fig. 1 - 9) consists of a three-dimensional body formed by the rear slide rails 1, the lower slide rails 2, the front support 3 and the supporting frame 4, wheels 5, folding handle 6, bracket 7. The volume cross-section body is 4-sided. The top left and right (in the direction of the trolley) the faces are represented by the supporting frame 4, and the bottom by the slide rails 2. The details of the surround body are connected by horizontal hinges both on the left and on the right: 8 (section along AB), 9 (section along the SD ), which is simultaneously the axle of the wheels 5, 10 (section along the MN) and 11 (section along the EI). A cover 12 is mounted on the supporting frame 4, which can be raised to a vertical position using horizontal hinges 13 (section along the ZhZ). In the middle (height) part of the rear runners 1, brackets 14 and 15 are fixed (sections along AB and ZhZ), in which horizontal hinges 8 of the supporting frame 4 and hinges 13 of the hinges 16 for the cover 12 are mounted. Inside the brackets 14 and 15 of both rear skids The stops 17 are rigidly mounted, and the stops 18 are mounted below on the horizontal part of the rear runners 18. Locking earrings 19 (cut along the LC), for which grooves are made on the cover 12, are mounted on the cover 12 and are mounted on the cover 12; bracket 7 (section along MN) opens forward on the horizontal hinge x 10 and is fixed on the supporting frame 4 by a latch, for example a rod bracket 21. When installing the bracket 7 inside the surround body, a support rod 22 is used, supported on the left and right brackets 14 and 15. An elastic bag 23 is placed inside the surround body. It is held in it from below horizontal transverse rods 24 mounted on the lower slide rails 2, on the front support 3 by the rod 25 and rods 26 fixed on the inside of the rear slide rails 1, as well as using latches, for example, in the form of belts 27 with rings 28, freely moving on the sides of the body of a hand truck (section along UX).

 As an option of the sliding mechanism along the steps of the stairs, removable tracks are installed on the rear slide rails 1 (Figs. 8, 9). The caterpillar tape consists of an external ribbed flexible with a high coefficient of friction, for example, rubber tape 29, fastened with polished metal fingers 30, allowing it to easily slide on the outer surface of the housing 31, which is oval from above and from below, mounted rigidly on the bracket 15. B if necessary, the track tape can be removed by disconnecting the cover 32 from the housing 31. In this case, sliding along the stairs will be carried out directly using the rear slide rails 1.

 The operation of a folding hand truck is as follows.

 Folding hand truck from the folded position (Fig. 5) should be brought into working condition (Fig. 1 - 9).

To do this, you must:
- pull the front support 3 by hand to the left and down until the bearing frame 4 is in contact with the stop 17, and the lower slide runners 2 with the stop 18;
- Locking earrings 19, freely moving along the edges of the support frame 4, put on the stops 17 and fix them in this position with the grooves 20 of the lowered cover 12 (section along the front side);
- if it is necessary to extend the support frame 4, the bracket 7 should be transferred from the internal cavity of the surround body on hinges 10 (section along the MN) to the left horizontal position and fix on the support frame 4 with a bar bracket 21;
- an elastic bag 23, which is located inside the assembled folding handle of the trolley when folded, automatically using belts 27 with rings 28 (section along the UX) will fill the entire internal cavity of the voluminous body and with the lid 12 lifted can be fully loaded. For operational convenience, the belts 27 are detachable, which allows the elastic bag 23, together with the load placed in it, to be removed from the voluminous body and used regardless of the folding hand truck;
- raise the folding handle 6 in a vertical position and secure it to the rear slide rails with a bar bracket 29 (Fig. 2).

(фиг. 6).On a folding hand truck, the cargo can be transported on a supporting frame 4 or only below it in a three-dimensional body or simultaneously in both of the above sheets. The bracket 7 folded forward allows you to place twice as much in volume of the cargo, and the luggage located in the elastic bag 23 promotes a more profitable use of the space between the wheels 5. The hinged bracket 7 helps to shift the center of gravity of the load when the folding hand truck is tilted towards the person leading it closer to the wheels, since the cargo can, for example, be placed on the platform with the long-sized side not vertically but horizontally, which significantly reduces the pressure of the folding handle 6 on the hands of a person, i.e. an effort

(Fig. 6).

 Placing the load in an elastic bag between the wheels increases the stability of the folding hand truck in motion. The rear 1 and lower 2 slide runners make the movement of the folding hand truck on the steps of the staircases more smooth and contributes to the expenditure of less physical energy.

 Transfer of a folding hand truck from a working position to a non-working position, i.e. in a condition convenient for transportation, is carried out in the reverse order.

 The folding hand truck moves along the stairs with the help of wheels and slide rails, presented in two versions.

The first - with the help of the rear slide runners 1,
the second - caterpillar device mounted on the sides of the rear slide rails 1 (Fig. 8, 9).

 The difference between the first and second types of sliding along the steps is that the caterpillar mover allows a person to spend less physical effort, since the sliding is carried out by friction of the metal parts 30 of the track on the metal casing 31, i.e. regardless of the material of the stairs, while when moving the rear skids on the stairs, they can most often slide, for example, on stone, concrete, wood, etc., which corresponds to a higher coefficient of friction than steel for steel carts, and, accordingly, a greater load on the hands of a person. In addition, sliding friction without a caterpillar can affect the more accelerated wear of the staircases, which may in some cases cause objections of the administration.

Claims (4)

 1. Foldable hand truck, comprising a supporting frame, a U-shaped bracket with a folding manual, lower runners and wheels, characterized in that it is provided with a front support pivotally connected to the axle of the wheels, forming a three-dimensional non-rigid body with a supporting frame having a hinged forward bracket, U-shaped bracket and lower runners directed from the axis of the wheels downward and in an ascending line to the front support, connected by horizontal hinges in the lower part to the lower runners, and in the upper part to the supporting frame, which is connected horizontally hinges with the top of a U-shaped bracket vertically directed tangentially to the rim of the wheels, rigidly connected at the bottom with the wheels and having stops at the top and bottom with locks on the supporting frame to turn off the horizontal hinges from work and ensure body rigidity, and mounted on the U-shaped bracket oval cases with removable closed tracks of caterpillar type.  2. The folding trolley according to claim 1, characterized in that the caterpillar tracks are made of two layers, the outer layer of which is made of flexible material, for example rubber, and the inner one of the transverse rounded solid fingers attached to it at a distance from each other, for example metal.  3. The folding trolley according to claim 1, characterized in that the stops for the stops are made in the form of freely installed oval rings.  4. The folding trolley according to claim 1, characterized in that the supporting frame has a lid mounted at the top on horizontal hinges at the top.

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