DE202005007882U1 - Locking castor wheel for trolley has the hub mounting attached to the cover cowl via flexible struts - Google Patents

Abstract

A simplified design for a locking castor wheel, e.g. for a trolley, has the wheel mounting (22) attached to the covering cowl (20) by flexible struts. The inner moulding includes a support ring (25) for the steering brake. The castor brake comprises a pedal (100) mounted in a slot (24) in the cowl and operating on a brake band (30) under which is secured a brake lining (33) for the main wheel (60) and a brake profile (13, 32) to lock into a gear wheel (12) at the bottom of the steering shaft.

Description

[Technical area]

The The invention relates to a roller fitting, comprising a rotatable in the body mounted vertical pivot axis, which at its lower end a gear has, a protective hood of a front and a rear hood part with a breakthrough, an underlying Radachselagerung, at least one rotatably held impeller, one in the breakthrough pivotally mounted brake pedal, which has a pedal surface and a puncture for one Pedal shaft, a punched out of a sheet brake plate, at its front end a locking tongue and at its lower end Side has a brake pad, the brake pedal and thus the Brake plate in the body about a pedal shaft or a bearing axis between a braking position, in which the rotational movement of the impeller through the brake pad and the Rotational movement of the pivot axis by the positive connection of his Gear is locked to the brake plate, and a release position, in which the impeller and the pivot axis around its own axis unhindered are rotatable, are pivotally mounted, according to the preamble of Claim 1.

[State of the art]

At the Pushing a relatively light load, conveyors with roller fittings, e.g. a handcart, a tea cart or even a stroller, often used. To turn at a turn or change direction to compensate for the resistances resulting from the ackermann effect, is the roller fitting on a vertical pivot axis about this rotatably mounted (so-called "swivel"). Because the fulcrum the roller / impeller of the roller fitting is not in the extension line is the vertical pivot axis, the impeller is in the direction change after pulled behind and self-acting on the changed Direction aligned. To avoid that equipped with roller fittings funding in its rest position already with a small impact in motion brought (for example the wheels turn around their own wheel axles, or the roller fitting turns around the vertical pivot axis.), becomes the pivotal movement the impeller and the vertical pivot axis of each roller fitting by a positive or non-positive Anti-rotation lock locked. As an anti-rotation device is an anchoring brake, which is actuated by a two-arm lever brake pedal.

To belong to this genus e.g. U.S. Patent 4,941,552 and the Taiwanese Utility Model Publication 578 703.

Out the USPS 49 41 552 a roller fitting is known, which has a body with a protective hood, a vertically held, on its own axis rotatably mounted pivot axis, at least one rotatably mounted therein Impeller, and one in a breakthrough of the guard pivot mounted brake pedal having a brake plate, which is a Pedal shaft between a braking position, in which both the rotational movement the impeller and the rotational movement of the pivot axis locked is, and a release position in which the impeller and the pivot axis are freely rotatable about its own axis, is pivotally mounted. The braking of the pivot axis and the laurad takes place simultaneously a pedaling of the brake pedal. In other words, the impeller and the pivot axis locked in its rotational movement when the brake pedal is brought into its braking position. The positive lock is provided by a provided at the lower end of the pivot axis circumferential toothing and an internally incorporated on the hub of the impeller Gearing, wherein the Bremsbelch in its braking position with his front end in a tooth gap the teeth of the pivot axis and with its rear end in a tooth gap the toothing of the hub engages, whereby the roller fitting against an undesirable Secured rotary and swivel movement. Will the brake pedal in his Release position brought, so are the impeller and the pivot axis released, taking a power-saving pushing with always on automatically the varying direction of travel aligned wheels is possible. The brake pedal is in its two positions (brake or Release position) stabilized by its own self-locking.

adversely is in the known role fitting that he constructively complicated is and must be produced with considerable effort. Another Disadvantage is that for Inserting the brake plate in the body a complex adaptation to the other removable components is required. As a result, one is easier and faster Assembly of the roller fitting impossible.

When Rollenbgeschlag known from Taiwanese utility model publication 578 703, the rotational movements of the impeller and the pivot axis can be independent of each other. For this purpose, the roller fitting has two independent brakes, each for the impeller and for the pivot axis. The first brake for the impeller has a brake pedal and a brake plate, which rests in its braking position with its front end on the running surface of the tire of the impeller (non-positive locking). The second brake for the pivot axis comprises a brake plate having a lug at its front end, and two pedals (a brake and a release pedal). The pivot axis points its lower end a perforated disc with a circumferential row of perforations. In its braking position, the brake plate engages with its approach in one of the perforations.

With the two independent Although working from each other braking systems, if necessary, the handcart be driven with a fixed direction of travel by this pushed with braked pivot axis and released impeller becomes. However, such driving is more stable, detected Driving direction in practice is not of great importance. The advantage of independence the rotational movements of the pivot axis and the impeller from each other must be decisive with a complicated structure and an associated increased constructive Expense to be bought. Due to the Taiwanese utility model, the in the prior art according to the USPS 49 41 552 existing problems at all can not be resolved. Rather, this is due to the increased number Of individual components the construction is even more complicated and the mount the brake plate and the brake pedal even more difficult.

Here The invention aims to remedy this. The invention is the task to provide a roller fitting of this type, with the o.g. Disadvantages can be avoided.

The Invention is based on the idea that to facilitate the positionally accurate Insert the Brake plate the Radachselagerung not massively shaped in the body, but about a narrow curved one bridge connected to the protective hood. This will be in the protective hood a large created free space, whereby the positionally accurate insertion of the Brake plate is facilitated.

to further increase the connection strength between the Radachselagerung and the protective hood can between the front hood part and the Radachselagerung one front bridge and between the rear hood parts and the Radachselagerung a rear bridge intended.

The Invention will be described below with reference to a preferred embodiment explained in more detail. It demonstrate:

[Drawing]

1 an exploded perspective view of a roller fitting according to the invention,

2 a schematic sectional rear view of the roller fitting in 1 .

3 and 4 in each case a sectional side view of the roller fitting in its braked or released position.

[Explanation of the Preferred Embodiment]

1 illustrates a roller fitting according to the invention, in total with 100 referred to as the state of the art one in the body 20 rotatably mounted vertical pivot axis 10 , a protective cover 21 from a front hood part 211 and a rear hood part 212 with a breakthrough 24 , an underlying Radachselagerung 22 at least one impeller rotatably supported thereon 60 with an axle bore 61 , a breakthrough 24 pivotally mounted brake pedal 40 which is a footprint 41 and a puncture 42 for a pedal shaft 43 comprising a punched out of a sheet brake plate 30 , which at its front end a locking tongue 31 has, and a rotatably mounted at the lower end of the pivot shaft gear 11 (here a crown wheel 11 with axially downwardly directed teeth 12 ). Here, the braking of the impeller takes place 60 by a force or frictional engagement between the brake plate 30 and the tread of the tire of the wheel 60 , For this purpose, the brake plate 30 a wavy brake pad 33 on, the one with the braked wheel 60 through the brake pedal 40 and thus through the brake plate 30 against the tread of the wheel 60 is pressed. How out 3 it can be seen, the brake pedal 40 normally remains in its release position, in which neither the locking tongue 31 with the gear 11 engaged still the brake pad 33 with the running surface of the wheel 60 in contact. Will the brake pedal 40 in its braking position in 4 Deep stepped, so attacks the locking tongue 31 in a tooth gap of the crown wheel 11 one. At the same time touch the crests or vertices 331 the running surface of the wheel 60 , This will both the impeller 60 as well as the pivot axis 10 locked in his / her rotary motion around its own axis of rotation.

The essential feature of the invention is that the Radachselagerung 22 not massive or block-shaped in the body 20 molded in one piece, as is the case with the USPS 49 41 552, but over an integrally formed, curved, narrow bridge 23 with the protective hood 21 connected and held together. The bridge 23 consists of a straight top section 231 and an arcuate lower portion 232 , This design creates a large free space for the free adjustment / movement of the components. As a result, a fast, positionally accurate mounting of the brake plate 30 in its storage, without the need for a special tool.

The brake plate 32 is one in the body 20 shaped bearing axis 25 pivoted, wherein the bremblech 32 with its one downwardly concave curved pivot section 32 on the bearing axis 25 overlaps. With game complementary to the contour of the bearing axis 25 rejects the body 20 a downwardly concave recess 213 on. The swivel section 32 is in play between the recess 213 and the bearing axis 25 held pivotally.

To ensure that the brake plate 30 after the brake pedal has returned 40 can also return to its release position in its release position, without remaining in its braking position, is a return spring 50 provided in the form of a compression spring. To the return spring 50 to keep stable in their holder, has the brake plate 30 a punched out, down-directed tab 34 on while the lower section 232 the bridge 23 a vertical approach 26 with an upstanding tab 261 has. As a result, the return spring 50 at each of its two ends through the tab 34 respectively, 261 held securely.

The gear 11 may be formed other than crown wheel. For example, it may be formed as the prior art according to USPS 49 41 552 as a spur gear with radially outwardly projecting teeth.

The impeller 60 has on its inside a circumferential groove 62 on, whereby a "brake drum" is made, the area of action through the inner side wall 621 the groove 62 is formed, against which the brake plate 30 in its braking position with its brake pad 33 is pressed.

The brake pad 33 may alternatively consist of a material or a coating with a high coefficient of friction or from a roughened surface.

To further stiffen the connection between the Radachselagerung 22 and the protective hood 21 can the Radachselagerung 22 additionally on its front over an annular front bridge 27 with the front hood part 211 and at the rear over a rear bridge 28 with the rear hood part 212 the protective cover 21 be connected, taking all three bridges 23 . 27 and 28 in one piece and uniform in substance with the protective cover 21 can be molded in an injection molding process.

The stabilization of the brake pedal 40 takes place as in the prior art by its own self-locking. Because the spring force of the return spring 50 compared to the self-locking force is very low, the brake pedal 40 be held in its braking position despite the strained return spring by its self-locking in stable.

The roller fitting may have two wheels, each on the two sides of the Radachselagerung 22 are stored. Accordingly, the brake plate 30 in this case, two brake pads 33 on.

Claims (8)

A roller fitting comprising one in his body 20 rotatably mounted vertical pivot axis 10 , which at its lower end a gear 11 has a protective hood 21 from a front hood part 211 and a rear hood part 212 with a breakthrough 24 , an underlying Radachselagerung 22 , an impeller rotatably supported thereon 60 , a breakthrough 24 pivotally mounted brake pedal 40 which is a footprint 41 and a puncture 42 for a pedal shaft 43 comprising a punched out of a sheet brake plate 30 , which at its front end a locking tongue 31 and on its lower side a brake pad 33 owns, with the brake pedal 40 and thus the brake plate 33 around a pedal shaft 43 or a bearing axis 25 between a braking position, in which the rotational movement of the impeller 60 through the brake pad 33 and the rotational movement of the pivot axis 10 by its positive connection with the brake plate 33 is locked, and a release position in which the impeller 60 and the pivot axis 10 are freely rotatable about its own axis, are pivotally mounted, characterized in that the Radachselagerung 22 over a bridge 23 from a straight upper section 231 and an arcuate lower portion 232 with the protective hood 21 is integrally and uniformly connected material. Roller fitting according to claim 1, characterized in that the gear 11 a crown wheel 11 with downwardly directed teeth 12 is. Roller fitting according to claim 1, characterized in that the Radachselagerung 22 additionally on its front over an annular front bridge 27 with the front hood part 211 and at the rear over a rear bridge 28 with the rear hood part 212 the protective cover 21 connected is. Roller fitting according to claim 1, characterized in that the rear hood part 212 on its lower side with play complementary to the bearing axis 25 a recess 213 for one on this comprehensive bearing section 32 of the brake plate 33 having. Roller fitting according to claim 1, characterized in that the brake pad 33 wavy is trained. Roller fitting according to claim 1, characterized in that the impeller 60 on its inside a circumferential groove 62 has, whereby a brake drum is made, the effective area through the inner side wall 621 the groove 62 is formed, against which the brake plate 30 in its braking position with its brake pad 33 is pressed. Roller fitting according to claim 1, characterized in that it comprises two wheels 60 having, respectively, on the two sides of the Radachselagerung 22 are stored, and the brake plate 30 accordingly has two brake pads. Roller fitting according to claim 1, characterized in that the protective hood 21 a breakthrough 24 for receiving the brake pedal pivotally mounted therein 40 having.