STEPLADDER Russian patent published in 1996 - IPC

FIELD: service equipment. SUBSTANCE: stepladder comprises working platform with axes 2 and 3 rigidly attached to it. On one side axes are hinged with ladder stands 4, while on the other side, with supporting stands 7. Grooves with pins of supporting stands 7 are made in ladder stands above working platform. Surfaces of mutual joining of pins and grooves are made inclined. Working platform with ladder link and supporting stands forms locked triangular profile with joint pin-groove working for compression, not open under load and ensuring reliability and simplification of the device. EFFECT: enhanced reliability, simpler design. 1 cl, 8 dwg