Abstract: Pipe ends are connected by a pipe joint comprising radially extending flanges, a sealing ring and clamping means connected to one of the flanges by holding means extending substantially radially inwardly toward the axes of the pipe joint. This is a continuation of application Ser. No. 587,617, filed June 17, 1975 and now abandoned.

Abstract: A tool head mounting arrangment in a turning machine of the type having a carrier and tool head clamped against seating surfaces therein. The tool head is adjustable in position relative to the workpiece. The carrier contains an opening for receiving the tool head. The opening includes an upper seating surface and a lower seating surface against which the tool head rests.

Abstract: An improved toolholder for clamping an apertured cutting insert into an insert-receiving site in a forepart of a holder shank. A pin, received in the aperture of the insert, is fitted into a bore provided in the toolholder. A clamping plate and co-operating actuating means urge the insert against the pin. The clamp plate has a V-shaped pocket complementary to two converging edge surfaces of the insert, and on its lower surface is provided with serrations adapted to engage cooperating serrations on a fore portion of the holder shank.

Abstract: The invention relates to a drill bit for use in percussion drilling. The drill bit has a solid bit body, has cutting members on its face and a centrally disposed rod-receiving hole in its rear portion. The hole has, in part, a conical internal surface and a cylindrical internal surface in front of said conical internal surface. Said cylindrical internal surface is provided with an internal thread at a distance remote from the bottom of the hole. A cooperating drill rod has a forwardly tapering portion with a conical exterior face complementary to the conical interior surface in the hole of the drill bit and an external thread on its forepart.

Abstract: In the saddle structure of the improved drill bit cutter assembly of the invention both spaced-apart legs are provided with bores each extending through the leg to receive a clamping bolt. These bores extend in directions including between them an angle of up to 90.degree.. The shaft-receiving recess, between the legs, has a polygonal shape complementing that of the end portion of the shaft.

Abstract: The knife assembly consists essentially of a relatively light two-edged cutting insert and a heavier holder. The insert is symmetrical about its longitudinal axis. In cross-section the two cutting edges of the insert represent the acute corners of a parallelogram, the obtuse corners of which are occupied by two longitudinal grooves that are hook-shaped in cross section. The holder includes a base plate having a projection complementary to either of said grooves. A clamping plate secures the insert on the base plate and binds said projection and said hook-like groove together. In the assembled knife the cutting edge of the insert is bounded by two plane surfaces one of which is flush with a plane surface on the holder and the other of which is flush with a plane surface on the clamping plate.

Abstract: The invention concerns a cutting insert adapted for a cutting tool having mechanical insert-replacing mechanism. The insert has angularly interrelated side surfaces,- for resting in a corresponding V-shaped pocket in the cutting tool, said side surfaces extending parallel to the main cutting edge of the insert.

Abstract: A drilling machine may include extension equipment comprising (a) drill rods -- connected end-to-end -- for transmission of impact force and (b) a system of tubular members -- likewise connected end-to-end -- surrounding said rods, for transmission of rotary force. Such extension equipment may be coupled to the machine per se by means of a tubular adapter threadably connected, at one of its ends, to the tubular members system and at its opposite end connected to the machine through polygonal coupling means.

Abstract: The wear resistance and toughness of a cutting insert comprising a ceramic oxide is improved by applying to it a thin surface layer of ceramic oxide, deposited from a gaseous phase, in which surface layer the grains have a size smaller than 1 micron and preferably smaller than 0.5 micron.In effecting the deposition, at least one of the components of the gaseous phase is present therein in the highest concentration possible without formation of powder.

Abstract: The cutting insert of the present invention has such shape that use of the same in a machining operation creates a greater than conventional surface pressure on the contact surface of the insert, such pressure causing an extremely thin, localized, area of the contact surface to attain an elevated temperature creating a flow layer therein. Such area reduction is effected by the formation on the contact surfaces of the notches inside of the cutting edge of the insert.

Abstract: For producing a welding electrode for hard-facing, a carbide or sigma-phase pre-alloy is very finely subdivided, mixed with carbon and/or cobalt, compressed to a coherent mass, heat-treated out of access to air and extruded to wire or strip.

Abstract: Drill rod for percussion drilling comprising a central rod member and a sleeve member disposed therearound for a major portion of its length. An annular space is provided between said rod and sleeve members, said space being partially filled with one or several elements of noise-suppressing material, said elements when in plural being spaced from each other.

Abstract: A tool holder for clamping an apertured cutting insert in an insert-receiving site in a holder body a provision of a clamping pin rotatably and pivotally received in a bore in the holder while extending into the aperture of the insert. The pin is axially disposed in the holder and provided with a threaded portion engageable in a locking plate fixed in an enlarged portion of the bore. When the pin is screwed into the locking plate it pivots into a position wherein the plate abuts against a shoulder abutment in the bore while a portion of the pin projecting into the insert urges the latter against lateral abutment in the site.

Abstract: A sintered hard metal body is provided with a thin wear-resistant surface coating consisting of an outer layer of ceramic oxide and an intermediate layer of carbide or/and nitride.

Abstract: A system is disclosed for controlling the discharge of articles from a steel belt conveyor. When articles are placed on the belt at the loading station, the belt is magnetized at a high intensity in a very small area which has a predetermined relationship, longitudinally of the belt, to the position of the article on the belt. The magnetized spot is also positioned transversely of the belt in accordance with the station where the article is to be discharged. At each discharge station there is an arrangement in the form of a plow and means to move the plow to and from the path of articles carried on the belt so as to deflect the articles from the belt. The plow operating mechanism has an electronic control which includes a Hall-effect transducer positioned adjacent the bottom surface of the belt and relatively positioned transversely of the belt along the path of the magnetized spots for that station.

Abstract: A sintered hard metal body (e.g., a cutting insert) is provided as to wear resistance by depositing thereon an intermediate thin coating of a metallic carbide or metallic nitride free from binder metal and applying over this intermediate coating a thin ceramic coating free from binder metal.