Midwest Plastic Fabricators

Other

Indian Head Inc.

Thomas F Moran, Jr

Andrew L Cross

Ivan L Volgyesy

A method and an apparatus are presented for forming couplings from blanks made from lengths of extruded plastic pipe, to join pipe together. The blank is cut from the length of extruded pipe and heated to the thermoplastic point. The heated blank is mounted between two mandrels which have a slight taper toward the ends, which are beveled. The ends of the mandrels are brought together inside the blank at a uniform rate and force. The pressure between the ends of the mandrels causes a bulge in the blank. A split die clamps around the blank at about the bulge, causing the bulge to collapse and forming a ridge in the inside surface of the blank. Coolant circulates in the mandrels and cools the inside surface of the blank. The mandrels are then withdrawn, leaving the formed blank in the split die.

Apparatus for forming plastic pipe couplings

A method is presented for forming couplings from blanks made from lengths of extruded plastic pipe, to join pipe together. The blank is cut from the length of extruded pipe and heated to the thermoplastic point. The heated blank is mounted between two mandrels which have a slight taper toward the ends, which are beveled. The ends of the mandrels are brought together inside the blank at a uniform rate and force. The pressure between the ends of the mandrels causes a bulge in the blank. A split die clamps around the blank at about the bulge, causing the bulge to collapse and forming a ridge in the inside surface of the blank. Coolant circulates in the mandrels and cools the inside surface of the blank. The mandrels are then withdrawn, leaving the formed blank in the split die.

Process for forming plastic pipe couplings

Barricade

A method of packaging tubular elbows is disclosed in which the elbows are stacked on a bottom frame in a parallel relationship, with each elbow facing the same direction. A top frame is placed on top of the elbows and the top and bottom frames are secured together by straps or other means to form a secure package. Preferably, the elbows are initially secured together into small bundles of about five elbows each before they are stacked in place to facilitate stacking and to provide a smaller quantity of bundles for subsequent distribution. The elbows may be packaged on a fixture having a pair of parallel posts between which the elbows may be stacked. The package produced by the method is also disclosed. The resulting package utilizes the inherent strength of the elbows to form a secure package, and the elbows are stacked in a nesting relationship to minimum the amount of space occupied by the elbows.

Method of packaging elbow-shaped members and package made thereby

A duct system is disclosed for telephone cables and other cables and conductors. The duct system includes a conduit having multiple bores each adapted to contain a cable, and a hollow, tubular duct branching from the conduit and adapted to contain a single cable or group of cables. The duct system also includes a connection adapted at one end to be attached to the conduit and to communicate with one of the bores of the conduit and adapted at the other end to be attached to the end of the tubular duct. The connection provides an easily and economically installed means for connecting single bore tubular ducts to multiple bore conduits which maintains the integrity of the duct system, may be formed of a long-life plastic material, and which provides a smooth interior surface for the pulling of cables therethrough.

Connector and adapter for duct systems for telephone cables and the like

The method and apparatus disclosed herein provide a stratified heat bath for use in the heating stage of thermoplastic deformation. It allows for heating of central sections of the thermoplastic lengths in order to render said lengths susceptible to deformation without heating the end sections or tangents of said lengths, permitting the ends to retain their original shape. In the case of tubular lengths, such as lengths of PVC pipe, the invention provides for more rapid heating than in the prior art.

Method and apparatus for heating lengths of thermoplastic material

An electrical switch or receptacle box for mounting in a wall, ceiling or the like, including a pair of opposite side walls having retaining studs of triangular or wedge-shaped configuration molded integrally therewith, and terminating rearwardly from the open forward side of the box. The box further includes a pair of integrally molded cover plate flanges which flank the opening at the forward side of the box. Each of the flanges carries a metal insert-receiving lug on the rear side thereof, and each of these lugs is slotted to engage an apertured metal insert which is positioned to receive through an aperture therein, a mounting screw extended through the respective flange and used to mount a cover plate carrying a switch or electrical receptacle on the box.

Growing community of inventors

Aurora, OH, United States of America

Thomas F Moran, Jr