Device for lifting sliding molds along steel bars for the construction of concrete buildings and the like

Apparatus for successively lifting sliding molds during constructuion of the wall of a concrete building or the like wherein said wall may be straight or curved and may have a variable cross-section, said apparatus comprising:

• (a) a plurality of hoist means;
• (b) a plurality of yoke structures, each of said yoke structures comprising a lower, substantially horizontal traverse secured to one of said hoist means, an upper substantially horizontal traverse along said hoist means, spaced substantially parallel inner and outer yoke posts extending between said lower and upper traverses whereby said lower and upper traverses and inner and outer yoke posts together form a parallelogram configuration, said yoke posts extending below said lower traverse, means pivotally connecting said inner and outer yoke posts to said lower and upper traverses at the corners of said parallelogram, and means adjustable in length and pivotally connected at one end to one of said inner and outer yoke posts and at the opposite end to one of said lower and upper traverses at points on said one yoke post and one traverse spaced from the pivot means connecting said one yoke post to said one traverse for changing the angular relationship of said yoke posts and traverses forming said parallelogram configuration;
• (c) a plurality of star beams arranged in a radial configuration above said plurality of yoke structures;
• (d) means displaceably securing each of said yoke structures to one of said star beams and adjustment means to move each of said yoke structures radially along the respective star beam;
• (e) an inner sliding mold of annular configuration connected to and supported by the plurality of said inner yoke posts;
• and
• (f) an outer sliding mold of annular configuration spaced from and surrounding said inner annular sliding mold and connected to and supported by the plurality of said outer yoke posts;
• (g) whereby the inclination of said inner and outer yoke posts and said inner and outer sliding molds may be adjusted by adjustment of the length of said braces, said yoke structures and inner and outer sliding molds may be moved upwardly by said hoists, and said yoke structures and inner and outer sliding molds may be moved radially by said moving means.