Abstract: A drill bit for a hammer drill for drilling in stone, concrete and the like includes a drill bit head formed as a hard material body with radial legs and having at least three radially extending cutting bits formed on the radial legs, and a centering tip in a center of the hard material body and projecting beyond one of the cutting bits, with the centering tip having concave limiting surfaces stretching between the linearly extending auxiliary cutting edges.

Abstract: A process for separating hydrogen from a gas flow having an oxygen constituent and including predominantly hydrogen, nitrogen, oxygen, carbon dioxide, carbon monoxide, methane and/or other hydrocarbons, as well as a device for conducting the process, is disclosed. The gas flow undergoes a process to thermally convert oxygen prior to the pressure swing adsorption process.

Abstract: The invention relates to a material for the formation of connections between two objects, for example between a roofing tile and a ridge tile. This material is a deformable filter foam, which is impregnated with a substance which is cured when exposed to air. Before the connection is formed, the filter foam with the substance impregnating it, is sealed airtight. When the connection is to be formed, the airtight seal is removed and the substance introduced between the objects to be connected. Due to the exposure to air, which is now possible, the substance becomes cured. This lends the previously soft filter foam a solid structure.

Abstract: A solid hard material head for a percussion drilling tool rotatable about a rotational axis (A) in a rotational direction (?), includes at least one main bit and at least one auxiliary bit (5), circumferentially offset relative to the at least one main bit (3) and having an auxiliary cutting edge (6) formed, at least piecewise, as a circular arc section (7) spaced from the rotational axis (A) radially inwardly and inclined in a radial direction, and a straight outer section (8) extending radially outwardly with respect to the circular arc section (7) and inclined in the radial direction.

Abstract: There is now provided a building having a pitched, sculptured tile roof with a ridge extending atop the pitched, sculptured tile roof, with a pitched tile roof venting arrangement disposed at the ridge. The building has walls to support a roof having a ridge beam, roof rafters, and battens that support roofing tiles. The roof also has a row of ridge tiles disposed on said ridge beam. A venting arrangement is disposed atop the ridge beam, between the ridge tiles and the roofing tiles. The venting arrangement has a center strip that is placed onto the ridge beam, and two side strips that cover a portion of adjacent uppermost roofing tiles. The side strips have air venting openings for the passage of air from beneath the roof to the outside of the roof. The air venting openings are covered by cover bands which cover bands permit passage of air to flow therethrough and prevent rain or drift snow to readily penetrate through the air venting openings.

Abstract: A drill, which is used in a hammer drill for drilling holes in stone, concrete and the like, includes a drilling head (10, 20, 30) formed of a hard material and provided, at its first end (5) with at least one main bit (3) having a tip (4), and at a second end (6) located opposite the first end (5), with a bottom surface (7) for the mounting the drilling head (10; 20; 30) on the drill stem (8), and having a plurality of axially extending through-grooves (11; 21; 31) for removing drillings produced during a drilling process and having a cross-section which increases, at least regionwise, in a direction toward the bottom surface (7) of the drilling head (10; 20; 30).

Abstract: A drill in particular for a hammer drill for drilling in stone, concrete and the like includes a drilling head (2) formed as a hard material body with radial legs (18,19) and having at least three radially extending cutting bits (5) formed on the radial legs (18,19), and a centering tip (11;21) provided in a center of the hard material body and projecting beyond one of the cutting bits (16,17), with the centering tip (11;21) having concave limiting surfaces (12;22) stretching between the linearly extending auxiliary cutting edges (13;24,24).

Abstract: The invention relates to a material for the formation of connections between two objects, for example between a roofing tile and a ridge tile. This material is a deformable filter foam, which is impregnated with a substance which is cured when exposed to air. Before the connection is formed, the filter foam with the substance impregnating it, is sealed airtight. When the connection is to be formed, the airtight seal is removed and the substance introduced between the objects to be connected. Due to the exposure to air, which is now possible, the substance becomes cured. This lends the previously soft filter foam a solid structure.

Abstract: A dust-proof element for reducing creeping dispersion of dust along a free surface formed as one of locally limited dust trap element (5) and dust barrier (7) having a surface with an artificial pimpled microcrystalline structure with bumps and indentations having a size in a range from 5 to 100 &mgr;m and spaced from each other by a distance from 5 to 200 &mgr;m, and a method of protecting hand-held tools and working tools with the dust-proof element.

Abstract: There is now provided a building having a pitched, sculptured tile roof with a ridge extending atop the pitched, sculptured tile roof, with a pitched tile roof venting arrangement disposed at the ridge. The building has walls to support a roof having a ridge beam, roof rafters, and battens that support roofing tiles. The roof also has a row of ridge tiles disposed on said ridge beam. A venting arrangement is disposed atop the ridge beam, between the ridge tiles and the roofing tiles. The venting arrangement has a center strip that is placed onto the ridge beam, and two side strips that cover a portion of adjacent uppermost roofing tiles. The side strips have air venting openings for the passage of air from beneath the roof to the outside of the roof. The air venting openings are covered by cover bands which cover bands permit passage of air to flow therethrough and prevent rain or drift snow to readily penetrate through the air venting openings.

Abstract: The present invention relates to a building having a roof with structured roof tiles and a structure projecting out from the roof surface, such as a chimney, a window, a wall, or ventilating pipe and to a method of constructing a roof of a building covered with structured roofing tiles and a structure projecting out from the roof surface, such as a chimney, a window, a wall, or ventilating pipe and also the gap between a ridge, an arris or hip covering.

Abstract: A drill including a body having mortises (7), and a solid hard metal head (4) having a plurality of bits (3) and secured to the drill body over the end surface (5) of the head (4) and additionally secured to the drill body over portions of side surfaces (6) of the bits, which are located in a radially outer region of the head (4), with the side surfaces (6) extending into mortises and including first surfaces, which are associated with at least some of the bits (3) and are subjected to pressure acting in a rotational direction of the drill during operation of the drill.

Abstract: The present invention relates to a building having a roof with structured roof tiles and a structure projecting out from the roof surface, such as a chimney, a window, a wall, or ventilating pipe and to a method of constructing a roof of a building covered with structured roofing tiles and a structure projecting out from the roof surface, such as a chimney, a window, a wall, or ventilating pipe and also the gap between a ridge, an arris or hip covering.

Abstract: A dust-proof element for reducing creeping dispersion of dust along a free surface formed as one of locally limited dust trap element (5) and dust barrier (7) having a surface with an artificial pimpled microcrystalline structure with bumps and indentations having a size in a range from 5 to 100 &mgr;m and spaced from each other by a distance from 5 to 200 &mgr;m, and a method of protecting hand-held tools and working tools with the dust-proof element.

Abstract: A drill including a body having mortises (7), and a solid hard metal head (4) having a plurality of bits (3) and secured to the drill body over the end surface (5) of the head (4) and additionally secured to the drill body over portions of side surfaces (6) located in a radially outer region of the head (4), extending substantially parallel to a rotational axis (A) of the drill and extending into mortise means (7), with the side surfaces (6) including first surfaces, which are associated with at least some of the bits (3) and are subjected to pressure acting in a rotational direction of the drill during operation of the drill.

Abstract: A covering material which can be plastically deformed by band and extended in at least one direction. The covering material has a substrate with openings, at least the top side of which substrate has a top coating which covers the openings. To create an economical covering material for covering the gap between a planar surface and a structured surface, in particular a highly structured roof surface, the covering material can be extended in at least one direction more than 30%, can be bent perpendicular to the direction of extension, and the entire surface of which covering material can be permanently and plastically deformed in three dimensions. The top coating is of a thin flat stock and that the coated substrate is, at least in the direction opposite the direction of extension, compressed, crepe-like, by at least 25% of its original length so that the surface of the covering material exhibits irregular little corrugations.

Abstract: Process and arrangement for producing tetrahydrofuran from a hydrous butane diol solution contaminated by light volatile, organic compounds, comprising the following process stages: a) Distillative removal (K1) of the light volatile, organic compounds contained in the hydrous butane diol solution 1. b) Dehydrating (R) of the thus prepurified hydrous butane diol solution 3 over an acidic aluminum oxide catalyst. c) One-step or multi-step distillation (K2) of the thus obtained high-tetrahydrofuran fraction 8 for obtaining a pure tetrahydrofuran. In addition, a separation of the water from the hydrous butane diol solution to water contents of from 2 to 70% by weight, particularly 2 to 10% by weight, can take place before the dehydrating of the butane diol.

Abstract: An unthreaded attachment of a joint eye to the piston rod of a vibration damper or spring strut, particularly by resistance welding. The piston rod and joint eye are held by one clamp electrode each, and the axial force created during welding is absorbed by a stop. A positive-locking connection is arranged between the piston rod and the clamp electrode to achieve axial fixing, so that joint eye can be attached in any installation state of the damper, even when the vibration damper is already installed.

Abstract: Process for the filling of a piston-cylinder unit, for example a shock absorber, with compressed gas and for closing the gas chamber of the piston-cylinder unit with a sealing element in the form of a base. The piston-cylinder unit is placed in an apparatus which apparatus can be connected to a compressed gas source from which the gas chamber is filled. The base is inserted by the apparatus into the open end of the piston-cylinder unit, after which the piston-cylinder unit, now under pressure and closed off by the base, is closed by, the process of welding.

Abstract: A roof tile construction includes a ventilation tile having pliable portions provided by a membrane of PVC (polyvinyl chloride) which is readily deformable to complement the shapes and configurations of adjacent roof tiles, whereby gaps between the headlap, side-lock and tail portions of tiles immediately adjacent the ventilation tile are substantially closed. The ventilation tile also includes a rigid body portion for supporting the membrane, the body portion being generally of planar configuration and being provided with adapter means for accommodating ventilation means such as a ventilation cap, or a soil pipe. The membrane is also of generally planar configuration and includes a headlap portion, oppositely disposed side-lock portions and a tail portion which extends beyond the rigid body portion.