Mold for producing concrete pipe

A two-piece mitred mold for producing a concrete pipe elbow, each piece comprising:

• an outer face normal to its longitudinal axis and an inner face inclined to its longitudinal axis;
• a two-member outer part and a four-member inner part, said outer part including a member defining the bottom of the outer part and a unitary upper member defining the sides and top of the outer part, said parts being rigidly secured one to the other;
• said inner part including a top member;
• a pair of L-shaped side members having vertical leg portions defining the sides of the inner part, and lower horizontal leg portions directed inwardly toward each other and spaced apart to partially define the bottom of the inner part;
• a bottom member adapted to be removably wedged between the inwardly directed horizontal legs of said L-shaped side members;
• the upper ends of said L-shaped members being flexibly secured to the opposite ends of said top member;
• quick release clamp means secured to the opposite ends of one of said parts for releasable attachment to the other of said parts;
• said clamp means being adapted to rigidly space said inner part from said outer part to define therebetween the configuration of the concrete pipe to be molded by said mold, and end plates to contain the concrete between said inner and outer parts while hardening, said inner faces of said pieces being adapted to interface to form said two-piece mitred mold;
• a base secured to the outer face of one of said pieces;
• a horizontal support pivotally secured to said base;
• means to pivot said base to an inclined position to vertically align the axis of said one of said pieces;
• and means to pivot said base to a horizontal position to vertically align the axis of the other of said pieces, whereby said concrete pipe is poured when said one of said pieces is in the inclined position and whereby said inner parts are thereafter removable from said outer parts by releasing said clamps, removing said bottom members from between said L-shaped side members and flexing said L-shaped members inwardly.