Abstract: A portable shelter having a pair of spaced apart runners supporting a frame carrying a suitable covering. A hinged plate extends between the runners and is shiftable between a lower position extendintg to the bottom of the runners for blocking the flow of air between the runners under the covering and a raised position to allow non-interfering movement of the shelter across the ground or ice.

Abstract: A low profile ceiling duct assembly to be used with rooftop air conditioners. The unit combines an octagonal sheet metal ceiling plate which provides the upper portion of a plenum chamber; this extending into the roof space above a ceiling opening. The lower plenum portion is provided by the molded plastic octagonal air distributor box, mounted against the edges of the plate and extending into the room space sufficiently to afford air flow sidewardly outward from the plenum. The air distributor box has outlet grilles at alternate sides of the octagon. They discharge air in four directions along the ceiling line while return air is drawn centrally upward.

Abstract: A heater and limit switch assembly, particularly useful for installation in the conditioned air duct of a rooftop air conditioner. The loop of a rigid-loop heater, mounted on a vertical plate by two parallel legs, is modified to provide an inward offset portion leading to the second leg. Radiation, from the offset portion and its bend into the second leg, is received at close range by a simple disk-type limit switch, positioned on the plate outward of the second leg and facing the offset, inducing prompt response to any increase over design temperature.

Abstract: A three-member molded plastic housing for rooftop air conditioners, including base and intermediate members having molded portions which together provide component lower and upper compartment walls and blower scrolls. The third member, an outer shroud, abuts sealedly along a roof ridge of the intermediate member to prevent recirculation within the shroud of condenser blower outlet air. The base member has downwardly molded projections for facilitating positioning the unit over a roof opening and resisting sideward forces.

Abstract: A two-piece plastic duct utilizing snap-together latch tongue and complementary engaging provisions together with overlapping sealing flanges to make adequately airtight duct assemblies. The duct walls consist of narrow trimming flats with measurement indicia; these flats are divided by narrower molded separators, which make it easy to trim the unassembled duct to desired length.

Abstract: A heater rack assembly, of the type which supports an electric heating coil in a pattern of parallel rows in a plane, utilizes double-ended stand-off insulators which are formed wafer-like in the plane. The insulators have, at each end, pairs of hook portions facing each other to provide a throat, which opens into a wire-accommodating slot behind the hook tips, the slot converging toward the center at an angle of 150.degree. or less. Adjacent turns of the coil are to be accommodated within the slot. Its convergence retains within the slot adjacent coil turns which might otherwise escape, requiring for such escape what is in effect a reverse in-plane twisting displacement.

Abstract: A method of and apparatus for automatically impinging or impressing bits or pieces of edible material such as bits or pieces of chocolate, chopped nuts or bits and pieces of other particulate edible material onto the periphery of a body or column of soft freezable confection such as a body of soft ice cream, ice milk or the like. The bits or pieces of edible material are agitated or vibrated as the edible material is fed to the periphery of a body or column of soft confection. The body or column of soft confection and the bits or pieces of particulate edible material on the periphery of the body or column of soft confection are moved through a restriction to impress or embed the bits or pieces of particulate edible material in the periphery of the soft column of freezable confection.

Abstract: A blending system for dispersing continuously in a fixed proportion of a dispersed first solids flow into a second bulk solids flow thereby forming a homogeneous solids flow. The system includes an upright vessel having an outlet for the homogeneous solids at its lower extremity. One or more blending stages are disposed within the vessel above the outlet. The blending stage has an inverted Vee element with inclined side surfaces mounted centrally within the vessel and with its apex pointed upwardly. A first inlet for the first solids resides vertically above the apex of the element. A second inlet for the second solids has a discharge opening about the first inlet and displaced laterally from the apex of the element. The dispersed first solids are supplied at a certain flow rate through the first inlet to flow about the apex of the element and downwardly along its side surfaces.

Abstract: The invention provides a dynamic system for heat-sealing an all-plastic material in a continuous process at high speed. The invention includes an all-plastic heat-sealable container material comprising a multiple-layer composite, in sheet form, including a core layer and at least one outer layer on one side thereof. The layers preferably comprise thermoplastic material, the core layer material having a higher softening point than the outer layer material. The composite sheet is conveyed through a converting, side-seaming or other apparatus at high speed, the system being tuned to dynamically heat the outer layers to a molten state for heat sealing, while the core does not soften but remains undistorted. The core is thus thermally insensitive to heat at speeds used in side-seaming the composite, and as such it supports and maintains the structure of the sealing outer layers on its exterior while they are in a molten condition.

Abstract: The invention provides a dynamic system for heat-sealing an all-plastic material in a continuous process at high speed. The invention includes an all-plastic heat-sealable container material comprising a multiple-layer composite, in sheet form, including a core layer and at least one outer layer on one side thereof. The layers preferably comprise thermoplastic material, the core layer material having a higher softening point than the outer layer material. The composite sheet is conveyed through a converting, side-seaming or other apparatus at high speed, the system being tuned to dynamically heat the outer layers to a molten state for heat sealing, while the core does not soften but remains undistorted. The core is thus thermally insensitive to heat at speeds used in side-seaming the composite, and as such it supports and maintains the structure of the sealing outer layers on its exterior while they are in a molten condition.

Abstract: The invention relates to an anti-jackknife apparatus for a tractor-trailer having a fifth wheel on the tractor unit to which the trailer is coupled. The fifth wheel is adapted to permit the trailer to be coupled thereto so that the trailer can turn with respect to the tractor unit when the tractor-trailer is in normal use. Braking means are provided in association with the fifth wheel and are adapted, when operated, to restrict turning of the trailer with respect to the tractor unit in use. Control means for the braking means are provided and are adapted to be operated from the driving cab of the tractor unit whereby, in use, the braking means can be used to arrest or prevent uncontrolled swinging of the trailer with respect to the tractor unit.

Abstract: A sputtering apparatus of the bell-jar type includes a high-vacuum pump disposed centrally of, and directly within a vacuum chamber of the apparatus. A separate enclosing member is disposed within the chamber and allows selective exposure of the pump to the chamber. An annular workholder is mounted in concentric surrounding relation with the pump, and an apertured, annular shutter is mounted in concentric surrounding relation with the workholder. Targets of materials to be sputter deposited on the workpieces are mounted on the inside wall of the main enclosure of the apparatus. The shutter and the workholder are moved in synchronism at the beginning and at the end of the deposition cycle to provide a uniform exposure of all the workpieces to the targets.

Abstract: A sputtering apparatus of the bell-jar type includes a high-vacuum pump disposed centrally of, and directly within a vacuum chamber of the apparatus. A separate enclosing member is disposed within the chamber and allows selective exposure of the pump to the chamber. An annular workholder is mounted in concentric surrounding relation with the pump, and an apertured, annular shutter is mounted in concentric surrounding relation with the workholder. Targets of materials to be sputter deposited on the workpieces are mounted on the inside wall of the main enclosure of the apparatus. The shutter and the workholder are moved in synchronism at the beginning and at the end of the deposition cycle to provide a uniform exposure of all the workpieces to the targets.

Abstract: Instead of constructing an air furnace cabinet as a separate unit and then installing the furnace components such as electrical heating elements, controls and a blower, in the present invention a blower scroll assembly and a heating element assembly are first constructed using flanged sheet metal panels as wide as the interior of the cabinet. The cabinet is then assembled about and integrally reinforced by these assemblies. Lines of securement of the flanges of these assemblies divide the exterior cabinet walls into smaller parts and afford to the cabinet strength and structural rigidity.

Abstract: A sputtering apparatus of the bell-jar type includes a high-vacuum pump disposed centrally of, and directly within a vacuum chamber of the apparatus. A separate enclosing member is disposed within the chamber and allows selective exposure of the pump to the chamber. An annular workholder is mounted in concentric surrounding relation with the pump, and an apertured, annular shutter is mounted in concentric surrounding relation with the workholder. Targets of materials to be sputter deposited on the workpieces are mounted on the inside wall of the main enclosure of the apparatus. The shutter and the workholder are moved in synchronism at the beginning and at the end of the deposition cycle to provide a uniform exposure of all the workpieces to the targets.