Patent Application
20110049926
This application is related to patent application No. 09011252.5-1268 filed Sep. 2, 2009 with the European Patent Office, the disclosure of which is incorporated herein by reference and to which priority is claimed.
The present invention relates to a roller carriage for a sliding bow roof for a truck or truck trailer, which roof encompasses guidance and runner rails, extending on the cargo surface of the truck along the longitudinal sides of the cargo surface, in which the roller carriages, which comprise rollers and on which retaining bows, embodied in gantry fashion and having a roof tarpaulin mounted thereon, are displaceably guided, at least one roller carriage being equipped with a securing device for preventing inadvertent shifting of the roller carriage along the guidance and runner rails.
Roller carriages of this kind, in which the securing device is embodied as a blocking element clampable against the guidance and runner rail, are known from practical use. This blocking element can be embodied as a screw that can either be pressed, by rotation, against the guidance and runner rail, or can be at a distance from it. A disadvantage in this context is that extended retention of the open roof is necessary until sufficiently clamping has been produced. In addition, accessibility is often limited and, with insufficient actuation and thus insufficient clamping, displacements can result in scraping on the guidance and runner rail and thus in damage to the guidance and runner rail.
These problems can also occur with blocking elements that, by way of a pivoting lever or push bar, press a rubber element onto the guidance and runner rail. Such blocking elements are furthermore subject to a bending load when used as intended, and functional impairments can occur as a result of wear on the rubber element.
Also known are blocking elements that are slid into a corresponding recess or bore of the guidance and runner rail and thus achieve positively engaged securing of the roller carriage. A disadvantage in this context is that another bore is required for each position, thereby weakening the guidance and runner rail. In addition, damage to the rollers can be caused by the bores because of sharp edges, and roller running can be interfered with.
It is an object of the invention to eliminate the aforesaid disadvantages and to describe a roller carriage with which, in simple fashion, inadvertent shifting of the roller carriage along the guidance and runner rails can be prevented.
This object is achieved in that the securing device encompasses a wedge element associated with a roller, which element is shiftable between a release position and a secured position, and in its release position has no contact with the roller, whereas in its secured position a portion of the wedge element is arranged between the roller and the corresponding guidance and runner rail. This on the one hand enables the roller carriage to be secured in any desired position. In addition, no weakening of the guidance and runner rail occurs, since bores are not required nor can scraping take place if blocking element is incompletely blocked. The self-locking property is utilized because of the wedge-shaped configuration of the wedge element, so that upon shifting in the one direction the wedge element exerts a braking action, and upon shifting in the other direction it automatically releases.
The wedge element can preferably be connected to a lever pivotably about a rotation axis, or mounted on said lever, the lever being arranged pivotably about a pivot bearing arranged at a distance from the rotation axis. The result is that shifting of the wedge element between its release position and its secured position is easily possible, and actuation by means of a lever means that only a small force is necessary for that purpose.
According to the present invention at least one guidance element, which ensures alignment of the wedge element and at least substantially prevents any pivoting of the wedge element other than that predetermined by the rotation axis, can be provided, so that in its release position the wedge element also has no contact with the guidance and runner rail.
The guidance element can be embodied as a projection that is arranged on the roller carriage and in particular is manifested in rod-shaped fashion, and an oblique surface coacting with the projection can be provided on the wedge element, so that upon pivoting of the lever a corresponding “steering” influence on the wedge element is produced.
In a preferred exemplifying embodiment of the invention, a locking element can be provided for securing the wedge element in its release position, so that inadvertent shifting into the secured position is not possible.
The locking element can be constituted by the guidance element, and can be embodied to coact with a corresponding recess in the wedge element, so that automatic locking upon shifting into the release position occurs.
The locking element can also encompass a spring element that prevents inadvertent shifting into the secured position.
The invention further relates to a sliding bow roof for a truck or truck trailer, which roof encompasses guidance and runner rails, extending on the cargo surface of the truck along the longitudinal sides of the cargo surface, in which roller carriages, comprising rollers and having retaining bows respectively embodied in gantry fashion and having a roof tarpaulin mounted on the retaining bows, are displaceably guided, at least one roller carriage being equipped with a securing device for preventing inadvertent shifting of the roller carriage along the guidance and roller rails.
In order to eliminate the disadvantages recited above, and in order to achieve the object of the present invention, the roller carriage is intended to be embodied in accordance with the present invention.
Exemplifying embodiments of the invention, depicted in the drawings, are explained below.
Matching reference characters are used in all the Figures for identical or similar components.
Encompassed for this purpose on the cargo surface of the truck are guidance and runner rails 2, extending along the longitudinal sides of the cargo surface, in which rails the rollers 3 of roller carriage 1 are displaceably guided. Roller carriage 1 that is depicted is equipped with a securing device 4 for preventing inadvertent shifting of roller carriage 1 along guidance and runner rails 2.
Securing device 4 encompasses a wedge element 5 that has a roller 3 associated with it and that is shiftable between a release position and a secured position. In the secured position depicted in the drawings, a correspondingly wedge-shaped portion 6 of wedge element 4 is arranged between roller 3 and the corresponding guidance and runner rail 2, so that securing of roller carriage 1 is accomplished because of the self-locking property, and shifting in the direction of the wedge element is not possible, or possible only to a very small extent.
Wedge element 4 is connected, pivotably about a rotation axis 7, to a lever 8, lever 8 being arranged pivotably about a pivot bearing 9 arranged at a distance from rotation axis 7. In the exemplifying embodiment depicted, pivot bearing 9 is constituted by a stud, mounted on roller carriage 1, on which lever 8 is journaled by means of an elongated hole.
A shifting of wedge element 5 between its release position and its secured position is thus possible in simple fashion, and thanks to actuation by means of a lever 8, only a small force is necessary in order to shift wedge element 5.
Also provided is a guidance element 10 that ensures alignment of wedge element 5 and at least substantially prevents any pivoting of wedge element 5 other than that predetermined by rotation axis 7, so that in its release position, wedge element 5 also has no contact with guidance and runner rail 2.
In the exemplifying embodiment depicted, guidance element 10 is embodied as a projection that is arranged on roller carriage 1 and is manifested in rod-shaped fashion.
Provided on wedge element 5 is an oblique surface 11 coacting with guidance element 10, so that upon pivoting of lever 8 a corresponding “steering” influence on wedge element 5 is produced. Also provided is a locking element 12 for retaining wedge element 5 in its release position, so that inadvertent shifting into the secured position is not possible.
Locking element 12 can be constituted by guidance element 10, and can be embodied to coact with a corresponding recess 13 or the like in wedge element 5, so that automatic locking upon shifting of wedge element 5 into the release position occurs.
The drawing depicts the secured position, in which the correspondingly wedge-shaped portion 6 of wedge element 4 is arranged between roller 3 and the corresponding guidance and runner rail 2, so that securing of roller carriage 1 is accomplished because of the self-locking property, and shifting in the direction of the wedge element is not possible, or possible only to a very small extent.
Wedge element 4 is connected, pivotably about a rotation axis 7, to a lever 8; rotation axis 7 of the wedge element coincides with the rotation axis of roller 3, since the wedge element is journaled on the roller by means of a correspondingly configured inner contour.
In order to reduce the risk of inadvertent securing, shifting of wedge element 4 is possible only against the return force of a retention element that is embodied, in the exemplifying embodiment depicted, as a helical tension spring 14. Other variants, for example using a friction element or the like, are of course also possible, and other types of spring, for example leaf springs, compression springs, etc. can also be utilized.
A shifting of wedge element 5 between its release position and its secured position is thus possible in simple fashion, and thanks to actuation by means of a lever 8, only a small force is necessary in order to shift wedge element 5.
| Number | Date | Country | Kind |
|---|---|---|---|
| 09011252.5-1268 | Sep 2009 | EP | regional |
