초록 ▼

An improved coupling (10) to be embedded in concrete (101) is described. The coupling includes multiple concentric rings (11c) on an outside wall (11a) of a tube (11) which aid in preventing leakage along the outside wall and which help in providing fire retardancy. The coupling includes a step form

An improved coupling (10) to be embedded in concrete (101) is described. The coupling includes multiple concentric rings (11c) on an outside wall (11a) of a tube (11) which aid in preventing leakage along the outside wall and which help in providing fire retardancy. The coupling includes a step form (14) having a regular diameter which aids in positioning the coupling using a template (105).

대표청구항 ▼

A plastic coupling having spaced apart parallel cylindrical inside and outside walls which coupling is adapted to be embedded in a concrete floor and to be bonded to plastic pipe and to be at least temporarily supported by a form for pouring the concrete floor which comprises: (a) a tube having an i

A plastic coupling having spaced apart parallel cylindrical inside and outside walls which coupling is adapted to be embedded in a concrete floor and to be bonded to plastic pipe and to be at least temporarily supported by a form for pouring the concrete floor which comprises: (a) a tube having an inside cylindrical wall adapted to be bonded to the plastic pipe defining a cylindrical longitudinal axis, a cylindrical outside wall and opposing ends between the walls; (b) attachment means at one end of the tube for securing the coupling to the form using connection means; (c) a series of equally spaced apart concentric rings on the outside wall of the tube each with two spaced parallel sides perpendicular to the axis and an annular side parallel to the axis, wherein the series of rings are located between the ends of the tube, wherein the rings are at predetermined heights relative to the attachment means so that the coupling can be severed at any predetermined height adjacent one ring and then the tube fitted with a cap which fits on an opposing end of the tube when severed at the predetermined height for pouring the concrete floor to the height of the cap; and (d) a step on the outside wall of the tube adjacent to the attachment means which can be used with a positioning template to be layed on the form prior to pouring the concrete for positioning the coupling.