Plate for a rocker joint chain

A plate for a rocker joint chain, wherein the plate includes two longitudinal legs and two vertical legs that together surround a plate opening. The plate includes an indentation positioned on an outer edge of at least one of the longitudinal legs, and it includes at least one tab positioned on the outside contour of the plate. The plate configuration enables an easier determination to be made to ascertain a specified orientation of such plates within an assembled plate-link chain formed from a plurality of plates.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a plate for a rocker joint chain, wherein the plate includes two longitudinal legs and two vertical legs that together surround a plate opening. In addition, the invention also relates to a plate-link chain having such plates, as well as to a method for checking a prescribed orientation of a plate in a plate-link chain.

2. Description of the Related Art

Plates for rocker joint chains are often not constructed symmetrically, so that they have to be properly oriented during assembly of the chain. Furthermore, known plates usually have one or more tabs on one longitudinal leg, with which they are arranged and installed in a prescribed orientation in the plate-link chain during assembly. In accordance with more recent efforts, such tabs on the longitudinal legs should be dispensed with insofar as possible, since they can lead to additional wear, for example in the case of guide rails provided for chain strand vibration reduction.

An object of the present invention is to provide a plate for a plate-link chain in which tabs on the longitudinal legs of the plate are eliminated, but in which the plate has a geometric feature that permits a conclusion to be made concerning the orientation of the plate, for example after it has been installed in a plate-link chain.

SUMMARY OF THE INVENTION

Briefly stated, in accordance with one aspect of the present invention, in a plate for a rocker joint chain, wherein the plate includes two longitudinal legs and two vertical legs which together surround a plate opening, an indentation is provided on at least one of the longitudinal legs and at least one tab is provided on the outer contour of the plate.

The tab is preferably situated in the region of the transition from a longitudinal leg to a vertical leg, and in such a way that when the plate is in the installed position in an extended plate-link chain the tab does not project beyond the surfaces of the plate-link chain. The tab position is such that when the plate-link chain contacts a guide plate or the like, for example, the tab does not come into contact with that plate.

The tab is preferably visible in the top view of the plate. A tab that is visible in the top view of the plate can be visually checked after the plate has been installed in a plate-link chain. That is done by using a computerized camera system, for example, with which the combination of indentation and tab is checked, so that it is possible to determine if the plate is installed in the plate-link chain in the correct orientation.

The indentation and the tab are preferably visible from at least one visual direction in a plane parallel to the plane of the plate. The plane of the plate refers here to the plane that runs parallel to the flat surfaces of the plate, i.e., a plane that is perpendicular to the rocker joint axes. Preferably, there is provision for the plate to include a plurality of indentations.

Furthermore, there can be provision for the plate to include at least one additional tab. The additional tab is preferably located on the same vertical leg as the other tab, but, alternatively, it can also be located on the other vertical leg. The additional tab is a stop tab, for example.

The object identified at the beginning is also achieved by a plate-link chain composed of plates in accordance with the present invention. The object identified at the beginning is also achieved by a method for testing a prescribed orientation of a plate in a plate-link chain, wherein the plate includes at least one indentation and at least one tab, and wherein the prescribed orientation can be detected when the indentation and the tab are visible.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1shows a top view of a plate-link chain1having a two-plate connection. The basic construction of plate-link chains, and the terms used in the exemplary embodiments in accordance with the present invention, will be explained on the basis ofFIG. 1.

FIG. 1shows a plate-link chain1having two-plate connections, but plates in accordance with the invention are equally applicable to a plate-link chain having three-plate connections. Plate link chain1includes a plurality of plates2and opposed plates2′. Plates2and opposed plates2′ are arranged alternately and are connected with hinge pins3as a hinge joint. Consequently, both ends of a plate are connected by means of a hinge to one or two opposed plates, and correspondingly both ends of an opposed plate are connected to one or two plates with a hinge.

The hinge pins3are in two parts, with a short rocker member5that is associated with each of the plates2and that rolls against a long rocker member5′ associated with one of the opposed plates2′. In addition, rocker members5,5′ each have a rolling profile, with which they can roll or slide on each other. The rolling profiles can be identical or different. The plates2and opposed plates2′ are stacked transversely to the chain running direction L, which is identified by a double arrow with the reference label L, so that an overlapping opposed plate is situated between two hinge pins3that are situated side-by-side perpendicular to the running direction L, and conversely, a plate is situated between and overlaps two opposed plates that are located side-by-side transversely relative to the running direction. The plate sets4of plates2formed in that way constitute a chain link by sets, and correspondingly, the opposed plate sets4′ of opposed plates2′ constitute a chain link by sets.

In the present exemplary embodiment the plates2and opposed plates2′ are identical parts; a differentiation between plates2and opposed plates2′ exists only in the arrangement. Therefore, only plates2will be referred to below, because they are identical to the opposed plates except for the arrangement in various plate sets (chain links). Both sides of the plate-link chain are provided with cover plates7. The cover plates are situated here only on the chain links4, so that only every second chain link has cover plates7. The cover plates7are firmly joined in each case to the rocker members5′. To that end, the rocker members are passed through receiving openings in the cover plates (not described here) and have a press fit; that is, they are pressed to the cover plates. While the plates2, which like the cover plates7belong to a chain link4, are joined with the rocker members5, or bear against them, the cover plates are firmly pressed with the rocker members5′ of the adjacent chain links4′. The rocker members5do not extend through the cover plates7.FIG. 1shows a set of one plate2as well as one cover plate7on each of the two outer sides, and a set of two opposed plates2′; however, sets with any other desired number of plates2and opposed plates2′ can also be provided.

FIGS. 2athrough2dshow exemplary embodiments of plates2in accordance with the present invention. The plates2are substantially flat plates in which a plate opening6is formed. The plate opening6includes three regions, namely a region6afor receiving a hinge pin and a region6cfor receiving another hinge pin. Situated between those regions is a region6b, which remains as free space when the plate-link chain is in its installed position. Region6aof plate opening6has a contact surface8a, and, correspondingly, region6cof plate opening6has a contact surface8c. Contact surfaces8a,8cserve to support or attach the rocker members5or5′.

The plates2include two vertical legs9and10and two longitudinal legs11and12. The vertical and longitudinal legs are not individual parts, but are each regions of the plate2that are given individual identities only for the purpose of identifying those regions. Indentations13and14are made in the two longitudinal legs11,12. The indentations13,14can have different depths y, different widths x, and different contours, but they can also have the same depths, widths, and contours. In the exemplary embodiments ofFIGS. 2athrough2dthe indentations13and14are all centered relative to a central axis15. However, a plurality of indentations13or14can also be made in the longitudinal legs11or12, or the indentations13or14are not centered relative to the central axis15but are offset relative to it.

The plates2each have a tab16, which is located in the region of the transition from the vertical leg10to the longitudinal leg11. Tab16is located there so that it does not extend beyond a straight line19(seeFIG. 2d), which is one of two parallel enveloping straight lines19and20that bound the respective outer surfaces of longitudinal legs11and12of plate2. Hence, the effect is that if plate2is laid with longitudinal leg11on a flat surface, tab16does not contact that surface. Additionally, tab16is positioned in such a way that it does not touch each adjacent plate2when plate-link chain1is bent about a transverse axis. In addition, tab16is positioned so that it is visible from the outside when plate-link chain1is installed. Those conditions are fulfilled when tab16is situated in the region of the transition from the vertical leg10to the longitudinal leg11. It is likewise possible to situate tab16in any other convenient transition from a vertical leg to a longitudinal leg. Tab16is visible in a top view of plate2; in particular, it is visible when plate2is installed in plate-link chain1. In addition, plate2can also include additional tabs17, as in the exemplary embodiments ofFIGS. 2band2d, and it can have a stop tab18, as in the exemplary embodiment ofFIG. 2d, which limits the bending angle of plate-link chain1.

Although particular embodiments of the present invention have been illustrated and described, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit of the present invention. It is therefore intended to encompass within the appended claims all such changes and modifications that fall within the scope of the present invention.