Standard_Parts_Catalogue

Page 1370 | 3.3 Hinging, Latching, Locking of Doors and Covers Multiple-Joint Hinges Technical Instructions Load capacity The maximum load capacity of the multiple-joint hinges depends on the hinge cross-section, the materials of the in- dividual parts and plain bearing bush as well as the installation situation (flap, hatch or door). For example, the larger cross-section of aluminum multiple-joint hinges makes them better suited for installation in doors than the stainless steel versions, which offer advantages in other areas. Distribution of the load also plays an important role. In the optimal case, the load should be evenly distributed among all hinges. The load capacity values given for the multiple-joint hinges are based on the following sources of information: • Values from the simulation software • Calculation based on material data • Tensile and compression tests • Endurance tests and empirical values The endurance testing of the hinges in door installations was carried out under the following conditions: • Hinge arrangement as a pair • Adherence to the mounting information • Warp-resistant test set-up • Standard door (flap or hatch) with overall dimensions 1200 x 600 mm • Even distribution of the load F A over the entire area (center of gravity) • At least 15,000 test cycles (Opening and closing once = one cycle) • Staged increasing of the load The wear, the movement characteristics and the elastic deformation were evaluated after every phase of the endurance test. If more than two hinges are installed, the permissible loads are correspondingly higher. The load capacity increases linearly as long as the load is evenly distributed between the hinges. If this is not the case, a corresponding safety factor must be taken into account. Alternatively, it is recommended that the function be tested in a test setup. Deformation If the maximum load is applied to the hinges, slight elastic deformation will occur, but this will have no effect on the func- tioning. In the least favorable load scenario (door installation) a deformation or lowering of ≈ 1-1.5 mm is permissible. The hinges can be adjusted, if necessary, using the available adjustment options. Lubrication and maintenance The joints of the multiple-joint hinges have high-quality plain bearing bushes with lifetime lubrication. Under normal con- ditions, no further lubrication of the bearings is required. Operational temperatures Depending on the hinge type (stainless steel or aluminum), various plain bearing materials are installed, which determine the maximum temperature range. The following ranges are permissible: • Stainless steel multiple-joint hinges: Bronze bushings, temperature range -200 °C to 280 °C • Aluminum multiple-joint hinges: Plastic bushings, temperature range -40 °C to 90 °C (briefly to 150 °C)