Berger Industries, Inc.

United Utensils Company, Inc.

Sidney Berger

Salvatore Buda

Burton L Weintraub

John J Cubieta

A coupling sleeve for joining the ends of two conduits. One end is threaded, the other is unthreaded. The conduit has a female thread which engages the threaded end. The unthreaded end has a terminal portion of reduced external diameter running to an inwardly displaced groove in which a locking ring is disposed. The end of the coupling sleeve which engages the unthreaded conduit end has a recess in which the locking ring is axially slidable and a flange that engages a full diameter external section of the unthreaded end. The recess is long enough to permit the coupling sleeve to be fully received on the unthreaded conduit end when the female thread is disengaged from the threaded end of the conduit.

Joint for conduit with single threaded end

A technique for the rotational molding of hollow articles having separate but structurally integral compartments is described. A mold in which the article is to be formed is provided with a cover between the mold cavities in which the article compartments are to be rotationally molded. The cover is selectively spaced from the mold wall so that a thermoplastic resin used to form the article can pass through the space between the cover and the mold wall to form the article walls for the compartments. The cover spacing from the mold wall is so selected that the build-up of the article's wall eventually seals off this spacing and enables further rotational molding of an article wall over the cover to isolate the compartments. In the specific embodiment, a technique for the rotational molding of a tank with legs below a bottom wall and a continuous uninterrupted interior bottom surface is described.

Method for rotationally molding a hollow article and article made thereby

A lamp harp includes a stiff bracket and a resilient bail. The bracket has a base and diametrically opposed bracket arms extending upwardly from the base. Each arm has a hollow interior and includes a channel portion which is formed by a pair of opposed parallel side walls and a base wall. At the point of transition from the channel portion to a U-shaped portion which joins the channel to the base is retaining means in the form of tabs which may be integrally formed with the side walls of the U-shaped portions to enclose the hollow interiors of the arms. Lateral slots are provided in the side walls of the channels immediately above the tabs to form abutment surfaces. The bail includes two downwardly extending free end portions which terminate in end faces and which have spaced above the end faces flats having a substantially rectangular transverse cross-sectional configuration. Each flat forms a foot at the end of the free end portion and is defined by two pairs of shoulders which cooperate with the abutment surfaces and the channels to limit lateral and longitudinal movement of the bail in the bracket.

Lamp harp

A coupling sleeve for joining the ends of two conduits. One end is threaded, the other is unthreaded. The coupling sleeve has a female thread which engages the threaded end. The unthreaded end has a terminal portion of reduced external diameter running to an inwardly displaced groove in which a locking ring is disposed. The end of the coupling sleeve which engages the unthreaded conduit end has a recess in which the locking ring is axially slidable and a flange that engages a full diameter external section of the unthreaded end. The recess is long enough to permit the coupling sleeve to be fully received on the unthreaded conduit end when the female thread is disengaged from the threaded end of the conduit.

Coupling sleeve

Each section of a conduit with a constant diameter axial passageway has male pipe threads formed on its outer wall surface at one end. A coupling sleeve is retained captively on the other end of the conduit section by a resilient lock ring means positioned partially in an annular lock ring groove disposed on the outer surface of the conduit section axially inwardly of the end face of the conduit section, i.e. -- in a direction along the conduit section away from this end face, and partially in an annular lock ring groove disposed on the inner surface of the coupling sleeve. The lock ring means spans the two annular lock ring grooves to prevent the coupling sleeve from being pulled axially outwardly off the conduit section.

Joint for conduit

Each section of a conduit has a male pipe thread formed on its outer wall surface at one end. The other end of each conduit section has a short length of decreased outside diameter extending axially inwardly with a decreased axial passageway through the reduced diameter length. A sloping annulus is formed between the length of decreased outside diameter and the remainder at the conduit section. The other end is flared and has a flat end face substantially perpendicular to the longitudinal axis of the conduit section. A coupling sleeve has an annular flange at its axially inward end which defines a central opening such that the coupling sleeve may slide freely to a limited extent over the length of decreased diameter of the other end of the conduit section. The axially outward end of the coupling sleeve has female machine threads formed thereon. Intermediate the inner surface of the flange and the threaded portion is a sloped shoulder. The coupling sleeve is retained captively on this other end by the interaction of the flange with the sloped annulus and the sloped shoulder with the flared end of the conduit section. The axial extent of the short length of decreased outside diameter is such that when said flange abuts the sloped annulus the end face of the coupling sleeve does not project beyond, e.g., is at least flush with the associated end face of the conduit section.

Conduit joint

Each section of an intermediate metal conduit with a constant diameter axial passageway has male pipe threads formed on its outer wall surface at one end. The other end of each conduit section has a short length of decreased outside diameter extending axially inwardly from the flat end face of the section, to form an external annular stop shoulder. A coupling sleeve has a pair of annular flanges which define central openings in mutual axial alignment but of different diameters such that the coupling sleeve may slide freely to a limited extent over the full external diameter of said other end of the conduit section. The coupling sleeve is retained captively on this other end by a resilent constrictable lock ring positioned in an annular lock ring groove disposed axially inwardly of the stop shoulder. When the coupling ring is unstressed, it protrudes, in part, radially outwardly of the groove and is in the path of movement of one of the flanges. The coupling sleeve can be retracted, i.e., moved axially inwardly, until the other flange, this being female threaded, abuts the stop shoulder. The axial extent of the short length of decreased outside diameter is such that when said other flange abuts the stop shoulder the end face of the coupling ring does not project beyond, e.g., is flush with, the associated end face of the conduit section. Assembly of conduit sections can be achieved without having to rotate either section. The end face of the threaded end of a first conduit section is butted against the end face of a reduced outside diameter end of a second conduit section. The coupling sleeve is screwed on to the threaded end until the one flange presses against the lock ring, causing the flat end juxtaposed faces of the two conduit sections to be pressed together with considerable force thereby forming a tight joint. Additional sealing means may be provided to ensure that the joint will be leak-proof. To disassemble previously assembled sections, consecutive coupling sleeves are backed off the threaded ends of adjacent conduit sections so that the end faces of the coupling sleeves are flush with the end faces of the associated conduit sections, permitting a section to be moved transversely away from a run of conduit without relative longitudinal displacement of adjacent conduit sections.

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Great Neck, NY, United States of America

Sidney Berger