JPH0240134B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention is applicable to link chains which are provided with any combination and number of chain link plates per chain link, as used mainly in forklifts as load chains, in particular any Regarding types of flyer chains.

[Background of the invention]

The handling fork of the forklift is adjusted by means of a hydraulic cylinder which reversibly drives a drive chain which is designed as a flyer chain. In this case there are usually two drives, one chain on each side of the cylinder, and this has a detrimental effect on the driver's vision. In order to further prevent this and improve the driver's visibility, only one flyer chain can be placed centrally in the range of the hydraulic cylinders or laterally by the lifting cylinders and/or by the forklift mast. This is well known. However, this has the disadvantage that the tensioned chain vibrates back and forth when a load is lifted or when the forklift is running, and the hardened link plates can damage the cylinder and piston. Even with the use of plastic clips attached to the link plates, these damages cannot be avoided since the clips are merely clamping and are therefore easily disintegrated.

[Purpose of the invention]

The invention therefore does not have the above-mentioned disadvantages and ensures sufficient protection of the hydraulic cylinder piston rod, independent of the configuration and number of lifting chains, with the running characteristics and engagement/turning points of the chains being The problem is to provide a flyer chain that does not adversely affect the positive coupling with the associated toothed or non-toothed wheel in the machine.

[Summary of the invention]

According to the invention, this problem is solved by providing a protective link plate with a free surface projecting on at least one side of the chain link, which is rigidly mounted between the link plates of the chain link. . The surface of the protective link plate, which projects on the side of the chain opposite to the side of engagement between the chain and the chain wheel, comes into contact with the piston rod of the hydraulic cylinder during vibrations of the chain and acts as a deflection. Additionally, it serves as a guide, limiting vibrations of the chain and supporting the chain's progression within a defined path of motion.

〔Effect of the invention〕

A centrally provided protective link plate is surrounded by intermediate link plates and outer link plates so that the width of the chain can be varied by the number of intermediate link plates.

It is a trapezoidal protective link plate, the base of the protruding surface is straight, and the upper corner is rounded into an arc shape, and the long side of the protective link plate is contracted to the center point of the radius of the roundness. Those with through-holes maintain good running behavior of the chain without limitation. In the engagement region of the chain, i.e. in the upper part of the protective link plate, this results in a shape of the protective link plate adapted to the bell-shaped contour of the link plates of the individual chain links;
The kinematic properties of the chain are not adversely affected.

In the case of plastic protective link plates, impact-resistant materials such as polyacetal or low-pressure polyethylene should be used.

The protective effect can be optimized by using protective link plates, for example L-shaped in cross section, with flat edges on their protruding surfaces. The protective link plates, with their flat edges facing towards the piston rod, can already be used with their flat edges against the piston rod during chain oscillations (the chain then performs a circumferential movement about its long axis depending on the stroke). This prevents large swings of the chain in a timely manner, which supports linear progression of the chain in a predetermined path of motion. The protruding surfaces/legs of the protective link plate can also be used for guiding the chain on the deflection rollers of the forklift. The link plate can thus engage in a recess in the deflection roller. Guidance of the chain by the protective link plate can also be achieved in that the link plate is received on one side at the end by a chain roller and on the opposite side by a contact ledge.
In both cases, edge plates can be omitted due to the lateral guidance of the deflection rollers.

In the case of protective link plates with free surfaces projecting on both long sides of the chain links, vibrations and also the inclination of the chain in two directions about the long axis are directly offset. The protective link plate can, for example, have a C-shaped cross section with flat edges on both projecting surfaces.

Vibrations that have an adverse effect on the running properties of the chain can preferably be counteracted by means of protective link plates which project laterally to the outside at least on one side of the chain and are attached to the chain bolts. The protective link plate mounted on the side of the chain adjacent to the piston rod may contact the piston rod undesirably after a short vibration or, in the case of a possible tilting of the chain, after a slight deviation of the angle about the long axis of the chain. Chain states are now affected and modified as quickly as possible.

A fixing element which abuts the protective link plate on the outside and can be attached by means of a rivet or press fit in the projecting region of the chain bolt can ensure the retention of the assembled chain link and link plate. The fastening element can consist, for example, of a disc, a link plate or a metal plate.

Protective link plates can also be mounted as mirror images on both sides of the chain. In this case, the service life of the protective link plate can be extended by reversing the chain. Especially the C provided on one side.
The shaped protective link plates also already make it possible to reverse the chain in the machine or forklift, thus bringing the previously less loaded side into the loading direction.

[Embodiments of the invention]

The invention will now be explained in detail with reference to some embodiments shown in the drawings.

In all embodiments, the flyer chain 1 consists of chain links consisting of an outer link plate 2 and an intermediate link plate 3, which are interconnected in an articulated manner by means of bolts 4, in particular rivets. The link plates 2, 3 surround in the center a plastic protective link plate 5 which is integrated into the flyer chain 1.

The protective link plate 5 is trapezoidal and has a straight base 6 and an arcuate rounding 7 in the upper corner area. Starting from the base 6, which represents the short side of the trapezoid, the side edges of the protective link plate 5 first proceed outwards at an angle of 30° and then transition to the rounding 7, where they extend over an arc of approximately 90°. . The radius 8 of the rounding approximately corresponds to the radius of the link plates 2 and 3 which are rounded at the end face of the chain 1. Protective link plate 5
At the center point 9 of the rounding 8 there is a through hole 10 for the bolt 4 passing therethrough for fixing the link.

The protective link plate 5 (see FIGS. 1 and 4), which is integrated into the chain, has a free surface 11 protruding from one side compared to the chain link, while the remaining part of the link plate forms the chain link. It closely matches the shape of the plates 2,3.

In the embodiments of FIGS. 4 and 9, the chain bolt 4 projects on one side of the chain, and in the one in FIG. 9 a C-shaped protective link plate 14 with outwardly extending flat edges 15 above and below the projecting free surface 11;
supporting the From the outside, a fastening element 16 made as an outer link plate rests on the projecting chain bolt 4 and connects the protective link plate 12,1.
4 to ensure their condition as well as the maintenance of the assembled chain links.

The L-shaped protective link plate 12 in FIGS. 7 and 8 also has a trapezoidal contour with a straight base 6 and arc-shaped roundings 7 in the upper corner areas. The protective link plate 12 is attached to the flyer chain 1 in such a way that on one side thereof, the flat edge 13 provided on the free surface 11, which projects compared to the chain link, is directed outwards, ie in the direction in which impact contact is expected. It is incorporated into

The outer contour of the H-shaped protective link plate 14 shown in FIGS. 12 and 13 can be compared to a hexagon with a lower straight base 6 and an upper straight base 17, with its central plane In a certain corner range, the end faces of the flyer chain 1 are rounded to a radius of 8, which approximately corresponds to the radius of the rounded link plates 2, 3, 16. At the center point 9 of the rounding radius 8 there is a through hole 10 for the bolt 4 passing through there for fixing the link. The protective link plates 14 (see FIG. 9) have free surfaces 11 to 18 projecting on both sides of the chain in the assembled state, so that the flat edges 15 of the protective link plates 14 are directed outwards, i.e., against anticipated impact contact. extending in the direction.

[Brief explanation of drawings]

1 is a front view of a link chain with a protective link plate according to the invention, FIG. 2 is a top view of the link chain of FIG. 1, FIG. 3 is a trapezoidal protective link plate, and FIG. 4 is an L-shaped protective link plate. 5 is a top view of the link chain of FIG. 4; FIG. 6 is a top view of the link chain of FIG.
A cross-sectional view along the line of the link chain in the figure,
Figure 7 is a front view of the L-shaped protective link plate.
Figure 8 is a side view of the link plate in Figure 7;
The figure is a front view of a link chain with a C-shaped protective link plate, Figure 10 is a top view of the link chain of Figure 9, and Figure 11 is a cross section of the link chain of Figure 9 along line XI-XI. 12 shows a front view of a C-shaped protective link plate, and FIG. 13 shows a side view of the link plate of FIG. 12. 1: flyer chain, 2: outer link plate, 3: intermediate link plate, 4: bolt,
5, 12, 14: Protective link plate, 6, 1
7: Base, 7: Rounding, 8: Rounding radius, 9: Center of rounding radius, 10: Through hole, 11, 18: Free surface, 13, 15: Flat edge, 16: Fixed element.

Claims (1)

Claims: 1. In a flyer chain consisting of chain elements in the form of link plates that are connected to each other using chain bolts, at least on one side to the chain elements and to the longitudinal axis of the chain bolt 4. free surface 11 protruding laterally
and a non-metallic protective link plate 5 integrated between the link plates 2 of the chain element.
A link chain characterized in that it has as a separate component. 2. The chain according to claim 1, characterized in that at least one row of protective link plates 5 is arranged in the center of the chain. 3. The chain according to claim 1, characterized in that at least one row of protective link plates 5 is arranged at a position offset from the center of the chain. 4 Projecting surface 11 of protective link plate 5
The base side 6 of the plate 5 is made into a straight line, the longer side of the plate 5 is made into an arc shape, the upper corner is rounded, and a through hole 10 is provided at the center 9 of the circle at the corner to form a trapezoidal guide link plate. 5. The chain according to any one of claims 1 to 3, characterized in that: 5. Chain according to any one of claims 1 to 4, characterized by a protective link plate made of plastic. 6 Protective link plate 12 has protruding surface 1
6. Chain according to any one of claims 1 to 5, characterized in that 1 has a flat edge 13. 7 Protective link plate 1 with L-shaped cross section
2. The chain according to any one of claims 1 to 6, characterized in that: 8. Any one of claims 1 to 7, characterized in that the protective link plate 14 has free projecting surfaces 11, 18 with flat edges 15 on both long sides of the chain link. or the chain described in one of the above. 9 Protective link plate 1 with a C-shaped cross section
9. The chain according to claim 8, characterized in that: 10. According to any one of claims 1 to 9, the protective link plates 12, 14 are attached to the chain bolt 4 projecting laterally on one side of the outside of the chain 1. Chain as described. 11. The chain according to claim 10, characterized in that a fixing member 16 is provided in contact with the outside of the protective link plates 12, 14.