Apparatus for production of cast concrete members

Apparatus for the production of cast concrete structural members comprising a stress frame, a mold form open from the top to receive a fluid concrete mix and carried by said frame, said mold form including at least one pair of substantially vertically disposed spaced side members closed off at opposite end and a horizontally disposed pallet closing off the lower end of the mold form, a side member springing mechanism for flexing said side members laterally away from each other at the lower ends after the concrete mix has been set in said form, said springing mechanism including a first yoke pivotally connected to the lower end of one of said side members of a pair, a second yoke pivotally connected to the lower end of the other of said side members of said pair, a first and a second connecting rod each affixed at one end to said first and said second yokes, respectively, a third yoke connected to the other end of said first connecting rod, a fourth yoke connected to the other end of said second connecting rod, a drive bar, means pivotally connecting said third and said fourth yokes to said drive bar, means connected to said drive bar for actuation thereof from a first to a second position to affect flexing of said side members, a swing arm assembly for supporting said pallet, said swing arm assembly adapted to be activated to elevate the pallet and the cast member after the concrete mix has been set in said form and the side members flexed to enable the cast member to be removed from the form, said swing arm assembly including a longitudinally extending support plate depending from said pallet, a plurality of spaced frist yokes disposed beneath said support plate and being pivotally connected to said support plate, a plurality of spaced second yokes pivotally connected to said stress frame and a plurality of connecting rods each connected at opposite ends to one of said plurality of first yokes and one of said plurality of second yokes, hydraulic actuating means connected to said support plate for displacing said support plate lengthwise of the form and thereby activating said swing arm assembly to elevate said pallet and the cast member set in the form.