Abstract: An improved method of blow molding bottles of thermoplastic material wherein intermittent extrusion apparatus is employed to produce bottles with finished necks free of external blemishes, the method including the steps of intermittently extruding tubular parisons from an annular orifice, enclosing the first tubular parison in a mold that has an interior cavity that defines the bottle and also defines a dome radiating outward from the upper end of the bottle neck, immediately blowing the parison essentially to the shape of the cavity, but as an incident to the blowing of the parison and to the interruption of the extrusion, causing the thermoplastic material to be severed at the extrusion orifice, and immediately shifting the mold enclosed article to a shaping station while the article is still at a temperature sufficient for subsequent shaping operations, and at the shaping station finish blowing the article while trimming and at least partially compression-molding the neck.

Abstract: A chair control comprising a frame structure adapted to be supported on a conventional chair base, a chair seat support pivotally mounted on the frame structure for fore and aft tilting movement relative to the frame structure, a biasing structure such as a torsion bar biasing the seat support to a position corresponding to a normal seating position of a chair seat, and rotatable blocking members mounted on the seat support for movement, in a tilted position of the seat support, to a position engaged with the frame structure so as to block return movement of the seat support to the normal position. The blocking members are operable by an actuating knob conveniently located close to the seat for operation by the seat occupant and are moveable to a plurality of positions corresponding to various tilted positions of the chair.

Abstract: Swivel apparatus for a chair or the like comprising nonmetallic bearing members rotatably supporting a swivel plate. The bearing members are mounted in fixed positions on a support and each has a laterally disposed arcuate groove located in interfitting engagement with a circular projecting extension on the chair mounted swivel plate so as to rotatably support the swivel plate.

Abstract: A swivel chair having a non-keywayed main screw rotatably connecting the chair seat and a supporting base to enable rotational movement of the seat with respect to the base. The top portion of the main screw is secured to the bottom of the seat, and the bottom portion is contained in the base for rotation therein. A ring shaped member, formed of a high coefficient of friction material such as rubber, is mounted on the screw at a position above the base. A nut is mounted on the screw and has a threaded portion the bottom of which comes in contact with the ring shaped member which is in turn rotatably mounted on the base by a washer formed of Teflon or similar low friction material. During normal rotation of the seat and thus the screw, the ring shaped member serves to grip the nut and rotate it with the screw, thereby keeping the seat at a constant vertical position.

Abstract: A seat back structure is provided that includes a frame and spring assembly having formed wire spring members supported on the frame, and a resilient pad is mounted over the formed wire spring members and has recesses in its inner surfaces which constrain movements of the wire spring members longitudinally and transversely relative to one another.

Abstract: A box spring assembly consisting of a horizontally disposed rectangular frame and a plurality of main wire springs and intermediate wire springs connected to each other and mounted on the top side of the frame. Each of the springs has a generally straight wire body portion and depending end portions, each of which is of serpentine shape and has a pair of angularly related sections. The end portions are secured to the frame so that they are compressible in a vertical direction when subjected to downwardly directed load.

Abstract: A weight distribution trailer hitch which has a pair of spring rods pivotally connected at their forward ends on vertical-axis pivot means adjacent the hitch ball and at their forward ends in a tensioned relation to the trailer tongue. The pivotal mounting for the forward ends of the spring rods is such that the spring rods are the same and are interchangeable and easily replaceable.

Abstract: A container consisting of a rigid outer tank having a collapsible bag liner for retaining viscous substances such as grease. A vane shape spacer assembly is disposed inside the bar and secured to the open upper end of the bag to provide a skeletal structure about which the bag can collapse as the grease is being removed to thereby insure more complete evacuation of a filled tank than has heretofore been possible.

Abstract: A bin for storing and transporting bulk material having a discharge opening located in one side wall and a door hingedly mounted on the side wall for movement to a closed position overlying the opening. A hinge is provided having horizontally disposed end pins on which the door is hung for up and down pivotal movement toward and away from the discharge opening. The construction of the hinge prevents the accumulation of contaminants and foreign matter around the door and enables the easy removal of the door from the bin.

Abstract: A bin for storing and transporting bulk material having a pair of sloped internal walls which direct contents of the bin toward a discharge opening in the bottom wall. A feed opening is provided in one of the internal walls in substantial vertical alignment with the discharge opening and a door is pivotally mounted on the underside of the wall so that it can be moved to a latched position closing the feed opening. A gasket retained in a channel on the door cooperates with flanges that are formed on the internal walls at positions surrounding the feed opening to provide a dust tight seal between the door and the internal walls of the bin.

Abstract: A one-piece bed pillow consisting of a pillow shaped molded body of open cell urethane foam material having its outer surface formed with a regular pattern of interconnected grooves. The pillow is formed in a mold which is placed in an upright position during foaming of the pillow body so that in use the pillow has a plurality of internal cells which are generally perpendicular to the direction in which load is applied to the pillow to thereby impart desirable load-deflection characteristics to the pillow so that it has low resistance to initial load and has increased resistance to higher loads. The user of the pillow thus finds that it has a desirable initial softness with a subsequent firmness that gives the user confidence in the ability of the pillow to hold the user's head.

Abstract: A collapsible container for storing and transporting bulk material, particularly baled rubber, and the like, comprising independent floor and wall members which can readily be moved between container forming and knockdown positions. In the container-forming positions of the wall members, a container of substantial capacity is formed and in the knock-down position of the walls, the container can be stocked so that several containers can be transported in a minimum transportation space. The floor is provided, adjacent its periphery, with an arcuate groove and the walls are provided at their bottom ends with complimentary shaped projections which pivotally interfit within the floor groove to facilitate quick and easy movement of the walls between upright container forming positions and horizontal knock-down positions. Releasable latches are provided at the upper corners of the container to connect adjacent walls together.

Abstract: An improved method of blow molding thermoplastic articles of superior physical properties by orienting the material during the formation of the articles. A two-stage blowing operation is provided wherein a tubular parison is extruded at a preblowing station spaced from a separate final blowing station and simultaneously a previously blown preform is supported on a blow pin at the final blowing station. A preform blow mold is closed on the tubular parison while a final blow mold is closed on the previously blown preform and the enclosed tubular parison and preform are blown to the shapes of the enclosing molds. The blow pin is then retracted from the final blow mold, and the molds are shifted so that the preform blow mold is at the final blowing station, and the final blow mold is at a discharge station. The blow pin is then inserted into the mold at the final blowing station so that the preform in the mold will be supported on the blow pin.

Abstract: A pillow block for mounting a bearing having an outer spherical surface, the pillow block including a molded one-piece rigid foam body member with a bearing seat in which the spherical surface of the bearing can be supported. Mold apparatus is disclosed for molding the pillow block in modified forms in each of which the bearing seat has a construction preventing axial displacement of the bearing when mounted in the pillow block.

Abstract: A spring assembly for use with a generally rectangular frame comprising a plurality of individual wire spring members interconnected to form a horizontal yieldable support deck, each spring member having a plurality of substantially square side-by-side U-shaped sections comprising a base portion and generally parallel leg portions which terminate in transversely extending leg extensions, one leg extension being integrally connected to a leg extension of the adjacent U-shaped section on one side thereof, and the other leg extension being connected to a leg extension of the adjacent U-shaped section on the other side thereof. The spring members are interconnected so that the junctures of the base portion and the leg portions of each U-shaped section of one spring member interconnects with an aligned U-shaped section of an adjacent spring member at the junctures of the leg portions and leg extensions thereof to thereby provide for pivotal movement of each spring member relative to the adjacent spring member.

Abstract: A chair control for an office-type chair having a seat supporting frame upon which a bucket-type seat is supported. A seat back supporting structure is pivotally supported at its lower end on the frame and is provided at its upper end with a conventional back member. Intermediate its ends, the seat back supporting structure is adjustably connected to a torsion bar so that the torsion bar will yieldably resist backward tilting movement of the seat back member. The torsion bar is mounted on the seat frame and extends front to rear of the seat. This enables a low profile assembly of the chair control and location of the chair control within the outer shell which forms a part of the bucket seat.

Abstract: A box spring assembly having a generally rectangular frame consisting of side and end rails and a plurality of spaced cross rails extending between the side rails, a border wire conforming generally to the shape and boundaries defined by the side and end rails, a plurality of longitudinal and transverse main springs parallel to the side and end rails and perpendicular to each other, and a plurality of internal support springs extending diagonally between pairs of main springs, all of the springs being of the formed wire type. Each main spring is attached to the border wire by a clip, and either the border wire or the spring or both are coated with a plastic material to preclude slippage of the clip. Furthermore, each internal support spring is attached to a pair of main springs by a clip, and either the support spring or the main spring or both are coated with plastic. All the wires may be coated with a different color plastic to facilitate assembly of the product.

Abstract: An insulated container for maintaining the initial temperature of its contents for prolonged periods of time. Insulation, comprised of a polyethelene outer skin lamination, an intermediate expanded foam lamination, and a fluid tight polyethelene outer skin lamination, is attached to the inner surface of a rectangular tank having an inlet opening in the top wall. A gasket simultaneously provides a seal between the tank and a cover, a fluid tight covering over the juncture between the insulation and the tank at the inlet opening, and a fluid tight covering over the open edge of the insulation at the inlet opening.

Abstract: A seat spring for a seating structure having front and rear frame rails wherein the spring is constructed from a one piece wire body shaped to form a front end fishmouth portion mounted on the front rail, a yieldable rear end portion mounted on the rear frame rail and a variable length main portion extending between the front and rear portions. The fishmouth portion and the front end of the main portion are configured so that when the spring is deflected in response to a downwardly directed seating load, the spring will bottom out on the front frame rail without any wire-to-wire engagement of portions of the spring during deflection. The result is a limited deflection spring which, under shock load, will deflect without any noise.

Abstract: A generally rectangular frame for supporting the springs in a box spring assembly consisting of horizontal side and end rails, a plurality of transversely spaced cross rails supported on and extending between the side rails, and a center rail supported on and extending between the end rails and interlocked with the mid portions of the cross rails so as to support the cross rails intermediate their ends. The cross rails and the center rail are longitudinally arched to provide a mattress foundation which is convexly arched in two directions when viewed from above. Telescoping bracket supports are provided for mounting the ends of the center rail on the wood end rails so as to eliminate the necessity for slotting the end rails and uniquely shaped tabs are struck out of the cross rails to enable easy interlocking of the center rail with the cross rails during assembly of the frame.