Abstract: In an apparatus for the production of tubular bodies such as tubes from a foil strip including a weldable plastic material, the longitudinal edges of which are welded together between two endless belts under the effect of heat and pressure with subsequent cooling, part of a belt runs against a mandrel in which individual portions thereof can be set to different temperatures to provide for selective control of the belt in order to increase the rate of production.

Abstract: The air supply system for feeding air to a firebox within a building comprises a fresh air intake box (3) in the outside building wall (19) and, in the immediate vicinity of the firebox, a distributor box (7), connected with several pipes (5a, 5b, 5c, 5d). The fresh air intake box (3) has an extensible tube (25) for adaptation to varying wall thicknesses of the outside building wall (19). The prefabricated parts can be readily installed on the building site. By the use of several pipes (5a, 5b, 5c, 5d), the individual pipe cross section can be kept at a small value so that no static impairment of the building ceiling (11), wherein the pipes (5a, 5b, 5c, 5d) are extended, occurs. Advantageously, a fan can be installed in the extensible and readily removable tube (25) in order to increase the flow velocity of the fresh air; servicing of the fan is possible without any problems.

Abstract: A shaped element consists of a soft and preferably elastic foamed material, comprising cellular webs which have been deformed remanently at least over areas. The shaped element is formed from a foamed material granulate, a soft foamed material having a grain size of 2 to 20 mms and filler material, for example cork granulate, rubber granulate, chalk, calcium carbonate, hard polyurethane scraps or thermoplastic plastics material scraps, with a grain size of 2 to 20 mms, which are distributed in the soft foamed material by the foaming action. The cellular webs or walls between the individual floccules of the foamed material granulate and/or of the filler material are remanently deformed over the areas concerned.

Abstract: A crank device for soil compacting apparatus having a crank shaft and a connecting rod coupled to each other by two eccentric elements rotatable about parallel shafts in which the first eccentric element is provided with a plurality of recesses and the second element is provided with a locking bolt with the elements being rotatable to relative positions at which recesses respectively are generally aligned with said bolt, with the bolt being mounted for movement between a first position at which it can enter a first recess generally aligned therewith and cannot enter a second recess generally aligned therewith and a second position at which it cannot enter the first recess aligned therewith and can enter the second recess aligned therewith.

Abstract: The floor of the furnace space [fire chamber] of the heating fireplace is constituted by a horizontal, flat part (7) and the rear wall of the furnace space is constituted in part by a vertical, flat part (8) of a heat exchanger serving for heating water for a hot water heater. Heat is transferred to the water on the sides (38, 39) of the heat exchanger (7, 8) facing the furnace space, and to two fresh air currents on the sides (9, 41) of the heat exchanger (7, 8) facing away from the furnace space. One of these air currents (42) extends under the horizontal heat exchanger part (7) and is fed through an opening (15) therein to the fire as combustion air; the other air current extends in a downdraft duct (22) along the rear wall (8) of the furnace space and further through an updraft duct (25) exposed to the heat of the fire and is fed to the room to be heated as heated, fresh air.

Abstract: A connector housing for a pair of fiber optic cables each terminated by a sleeve. The housing is provided with integral resilient latching fingers adjacent to its opposite ends which engage behind shoulders on the sleeves to releasably retain the sleeves in the housing.

Abstract: A device for feeding fish, especially pet fish, according to which a floating body for floating on the water in an aquarium carries tubular means which are inclined or arranged vertically upwardly from the floating body and are adapted to slideably receive and guide fish food bodies arranged one on top of the other. The lower end of the tubular means is partially open to permit fish access to the respective lowermost body of fish food in the tubular means while preventing a dropping-out of the fish food bodies from the tubular means. The invention also concerns a fish food body which may be ballshaped, may have a spherical head and flat bottom or a conical head and flat bottom or any other shape so as to assure when the fish food bodies are arranged one on top of the other, substantial contact point only of the lower fish food body with the next higher fish food body.