PL239429B1 - Truck axle mechanism - Google Patents

Description

The subject of the invention is a wheel axle mechanism of a pram, which can be used in various types of prams, e.g. wheelchairs, warehouses, shops, and especially prams.

Currently, there are various solutions that allow easy assembly and disassembly of the wheels of the trolley with or without their axles. For example, a solution is known which enables complete wheels to be detached from the chassis of a trolley. However, in this solution, reducing the width of the trolley chassis, from which the wheels have already been removed, still requires the removal of the axle. The currently known and described solution does not make it possible to bring both peripheral elements of the axis closer to each other. Meanwhile, the axle elements, after removing the wheels of the trolley during transport of the folded trolley, easily fall out and get lost.

The object of the invention is to develop such a structure that will enable the width of the bogie's chassis to be reduced in a safe manner and preventing the loss of the detached parts.

The mechanism of the wheel axle of a trolley with a handle mounted on the trolley structure in the lower part of a given leg of the trolley frame, the element of which is an axle intended for mounting a trolley wheel directly on it, which is inserted into a handle hole adapted to its shape, which axle has a circumferential recess and circumferential necking. On the other hand, the handle has an automatic axle lock equipped with a wedge which meets the circumferential narrowing of the inserted axle and which corresponds to the shape of the circumferential restriction. The essence of the developed mechanism of the bogie wheel axle is that the axle has an additional restrictor blocked after its deep insertion by an automatic axle lock equipped with a wedge, which is faced by a deeper inserted axle, which is protected against too deep insertion by a socket or a cage inside the wheel axle housing of the bogie preferably with a spring disposed therein.

Preferably, the developed wheel axle mechanism of the trolley has - apart from the circumferential constriction and the orifice - at least one additional orifice.

Usually, the circumferential constriction, circumferential depression, and the constriction are analogically contoured and shaped.

The spring - if used - is sometimes based on the rivet and it is most compressed when the axle is hidden in the structure housing.

Preferably, the developed bogie wheel axle mechanism of the bogie has a slider pushing the axle.

The advantage of the invention is the possibility of hiding the axis of the wheel inside their holders after disassembling the wheels and easy reduction of the dimensions of the trolley. This is especially important for a pram, which can now be easily transported in the folded position, e.g. with other vehicles. The described structure reduces to a minimum the dimensions of the disassembled wheels, which are devoid of protruding elements. The developed solution also prevents the loss of the trolley wheel axle elements, which until now were very likely to be disassembled when dismantled and stored separately. The introduced springing elements of the chassis also facilitate the efficient performance of all assembly activities, especially disassembly of the trolley.

The subject of the invention is shown in more detail in the embodiment in the drawings, in which Fig. 1 - shows an axonometric view of a bogie wheel axle mechanism, while Fig. 2 - shows an axonometric view of a bogie wheel axle mechanism with the housing partially removed.

As shown in the drawings, the essential element of the wheel axle mechanism of the trolley is the axle 1, or more precisely, the axles 1, which are used to fix the wheels of the trolley. They are placed on both sides of the trolley in the holders 2. Each handle 2 has a hole for inserting the axle 1 inside it. The handle 2 is also equipped with an automatic lock 3 of the axle 1, keeping the axle 1 in a fixed position.

Each of the axles 1 of the trolley wheel has circumferential constrictions 4 and has both its ends specially shaped, which are tapered in a manner. Thanks to this, it is possible to easily and quickly insert the axle 1 into the holder 2. This shape allows, on the one hand, to mount the wheel of the trolley on the axle, and on the other hand - to lock it in the selected position in the holder 2. take place before mounting the shaft 1 in the holder 2.

Each of the two automatic locking mechanisms 3 located at the ends of the wheel axle of the trolley is provided with a wedge which locks or releases the inserted axle 1, locking or releasing the mechanism. The locking wedge usually fits tightly into the circumferential constrictions 4 of the axle 1, ensuring its effective locking. If, for example, the end part of the wedge has the shape of a prism - then its dimensions also correspond to the cross-section of the circumferential narrowing 4.

PL 239 429 B1

The inner end of the shaft 1 is first inserted into the holder 2. When it is inserted and hits the wedge, it pushes the wedge off itself. Its conical shape makes it possible. Thus, to be able to enter into the housing of the axle 1, it is not necessary to press the release button 5. When the movement continues - the lifted wedge slides off the round, full walls of the cylindrical axle 1 until it hits the first, innermost, circumferential constriction 4. The automatic locking mechanism 3 then locks.

In order to be able to remove axle 1 (or axle 1 with a wheel already seated on it) - it is necessary to press the button 5, which retracts the wedge and releases the automatic lock 3.

On the other hand, pressing the button 5 and disarming the automatic lock 3 also makes it easier to continue inserting the axle 1 into the housing and hiding it to the selected depth, which is determined by the place of making the circumferential orifice 9, or the corresponding analogous circumferential orifice 9a, or other ones. Thus, depending on the arrangement and the number of circumferential constrictions 4 and reducers 9 (exemplary ones are shown in the drawing - Fig. 2), the axle 1 can be adequately deeply hidden inside the wheel axle housing of the trolley. Its appropriate positioning enables adjustment of the axle distance 1 placed in the cart and selection of the appropriate wheel track of the cart.

Due to the fact that pressing the button 5 and disarming the automatic lock 3 enables the continuation of insertion of the axle 1 - it is possible to completely hide it in the housing. Due to the fact that the shape of the wedge usually corresponds exactly to the shape of the narrowing 4 and reduction 9-axle 1 of the trolley, after it is locked, it is stable, and its accidental movement during the blocking of the mechanism - inside or outside the trolley structure - is impossible.

In the outer part of the axle 1, a circumferential recess 6 is made, which is used to seat the wheel of the trolley thereon.

The circumferential constriction 4 and the circumferential depression 6 can be shaped and shaped analogously.

The inner part of the shaft housing 1 introduced inside can rest against the housing that covers it, or the cage inside the wheel axle housing of the trolley or the spring 7 located there. The spring 7 can rest against any housing element shaped, for example, by casting. Such an element may also be a rivet 8, which, by blocking the spring 7 on itself, allows it to be compressed under the thrust of the axle 1. When the axle 1 is hidden in the casing of the structure - the spring 7 is the most compressed.

Unlocking the automatic locking mechanism 3 will automatically push out and extend the axle 1 by the expanding spring 7.

The mechanism for mounting the axle of the bogie wheel in the chassis can therefore be provided with elements that can automatically advance the axle 1, and at least assist in its extension.

It is also possible to use a simpler structure and block the axle 1 without the use of an additional throat 9. In this case, in order to keep the axle 1 in the retracted (retracted) position, an appropriate profiling is provided, preferably plastic locking protrusions, which are located in the center of the housing to which axle 1 is retracted.

If the spring 7 is not used in a particular embodiment of the invention - in this case, in order to reduce the width of the wheel axis of the trolley and dismantle it - it is necessary to shake the axle 1 from the inside of the housing. The axis 1 can be moved and extended by pulling it out of the wheel axle holder hole or pushing it with the built-in slider.

List of elements:

1st axle;

2. handle (axles);

3. automatic lock (axles);

4. constriction (circumferential);

5th button;

6. recess (circumferential);

7.spring;

8. rivet;

9. venturi.

Claims (5)

1. Mechanism of the wheel axle of a trolley with a handle mounted on the trolley structure in the lower part of a given leg of the trolley frame, the element of which is an axle intended for mounting a trolley wheel directly on it, which is inserted into the handle hole adapted to its shape, which axle has a circumferential recess and a circumferential restriction, and the handle has an automatic axle lock equipped with a wedge, which meets the circumferential restriction of the sliding axle and which corresponds to the shape of the circumferential restriction, characterized in that the axle (1) has a throat (9) blocked after its deep insertion by an automatic lock ( 3) axle (1) equipped with a wedge, which is met by a deeper inserted axle (1), which is protected against too deep insertion by a socket or a cage inside the wheel axle housing of the trolley, preferably with a spring (7) located here. 2. A bogie wheel axle mechanism of a trolley, according to claim 1, A device as claimed in claim 1, characterized in that it has - apart from the circumferential constriction (4) and the orifice (9) - at least one additional constriction (9a). 3. A bogie wheel axle mechanism of a trolley, according to claim 1, 3. A method as claimed in claim 1 or 2, characterized in that the circumferential constriction (4), the circumferential depression (6) and the orifice (9) are analogously contoured and shaped. A bogie wheel axle mechanism as claimed in claim 1. A method according to any of the preceding claims, characterized in that the spring (7) rests against the rivet (8) and is compressed most strongly when the axle (1) is retracted in the structure housing. A bogie wheel axle mechanism as claimed in claim 1. One to four, characterized in that it has a slider pushing the axle (1).