Patent ID: 6595322
Filing Date: 2003-07-22
Classification: B66F

Abstract:
A working platform assembly, comprising:a platform; and a scissor-type mechanism for extending and retracting the platform, said scissor-type mechanism having a plurality of superimposed pairs of arm members, thereby defining a lower first pair of arm members and at least one second pair of arm members being positioned thereabove, wherein the arm members of the first and second pairs of arm members have a cross section which decreases in upward direction, wherein the second pair of arm members has an upper end and includes an inner side formed with an outwardly directed slope which is realized by positioning the upper end of the arm members at a slanted angle, wherein the scissor-type mechanism has more than one said second air of arm members, wherein each of the second pairs of arm members has an overall length, and the slope at the upper end of each of the second airs of arm members has a length with respect to the overall length thereof, wherein the length of the slope at the upper end of the second pairs of arm members increases successively, wherein the second pair of arm members having a smallest length of the slope at the upper end with respect to the overall length thereof being lowermost, with the remaining second pairs of arm members being positioned there above in the order of increasing length of the slope at the upper end with respect to the overall length thereof.