Abstract: An article for forming a tubular protective cover around telephone and electrical cables comprising a generally flat band of material having opposite upper and lower surfaces and end edges, one of the surfaces being planar, the other surface being provided with a plurality of spaced grooves therein. Each groove is of V-shape and has inclined sides which intersect to form an apex proximate the planar surface to form a hinge where the band can be folded to enable the band to surround a cable. The other surface of the band is relatively flat between the grooves to define a continuous planar surface. At the grooves, the band is formed with elevations projecting beyond the plane of the surface in continuation of the sides of the grooves such that with the band folded at the hinges, the elevations at the sides of the grooves approach one another to provide a stiffening effect for the folded band around the cable.

Abstract: A preform of thermoplastic material composed of a number of separate part-preforms fitted into one another in readiness for blow moulding to form a finished container. At least one of the part-preforms is stretched in the axial direction to provide crystallinity by monoaxial orientation. The part-preforms are singly or jointly provided with barrier layers. Different plastic materials can be used for the part-preforms as well as reprocessed plastic for one of the part-preforms. Through suitable selection of the material of the part-preforms as well as of the material of the barrier layers, it is possible to mould containers suitable for a great variety of different fields of application.

Abstract: A method of manufacturing a compound plate by explosion-welding, the compound plate being intended for package-rolling. The plating material is smaller in area than the base material so that an edge is formed around the periphery of the base material, this free edge surface being protected by the attachment of metal strips, after which an explosive charge, the area of which is at least as great as that of the base material, is placed on top of the plating material and detonated.

Abstract: Arrangement in data transmission between a transmitting computer, sending signal words containing start-stop information, message words and address-control signal information, and a receiving computer, for providing separate supervision of faults on the transmission lines and of such errors which are caused by faults in the signal equipment pertaining to the computer of the transmitter side, intermediate stations or the computer on the receiver side. The arrangement includes means for generating and checking two check sums which are mutually supplementary, an inner check sum (S) for monitoring the hardware incorporated in computers and intermediate stations on a transmission path, and an outer check sum (YS) for monitoring the transmission lines. The inner check sum is formed by adding all the message words in a complete signal word; and the outer check sum is formed by adding the address-control signal information, message words and the inner check sum.

Abstract: A form-retaining container made of synthetic plastic material and apparatus for its manufacture in which a plastic material is fed in liquid state onto a male member to provide a layer on the male member constituting a blank for the container. The layer is cooled to prevent crystallization of the material. The thus cooled blank is placed into a mold cavity having an interior configuration corresponding to the desired outer shape of the container to be produced. The layer is inflated into conformity with the mold cavity. The configuration of the mold cavity is such that the blank undergoes biaxial stretching in a middle region of the container by at least 1.5 times while the mouth and part of the bottom of the container will be formed by biaxially stretching the blank less than 1.5 times. The inflated blank is then heated until curing is completed and then the blank is removed from the mold.

Abstract: A clock generator for establishing working clock pulses occurring for constant increments in a scan path of a laser scanner which cyclically sweeps over a record medium at a non-constant velocity includes: a generator of a fiducial pulse at least once per cycle of sweep; a frequency synthesizer responsive to the fiducial pulses for generating radio-frequency clock pulses having a frequency greater than the fiducial pulses, and in synchronization therewith; a storage for storing a plurality of count values, each of the count values being associated with a given increment along the scan path; a working clock pulse generator, including a counter which counts the radio-frequency clock pulses, for emitting a working clock pulse each time the counter counts a count value received by the working clock pulse generator. For each working clock pulse a new count value stored in the storage is transmitted to the working clock pulse generator.

Abstract: An MTI-filter included in the receiver part of a tracking radar for suppressing clutter when receiving echo pulses from a certain target. The transmitting pulses of the tracking radar are transmitted in series where the carrier frequency is varied from pulse to pulse and is repeated from series to series. The MTI-filter (F) contains a number of delay links (DL1-DLN), for example digital shift registers which are stepped forward timely with the radar PRF. The input of the filter and the output of the shift register M.ltoreq.N are connected to a differentiator (SK) where M=the number of carrier frequencies in a pulse series.

Abstract: A hypodermic syringe comprising a housing having a needle chamber and a sealed receiving chamber containing an injection liquid. A hollow needle is mounted for slidable displacement in the needle chamber in a retracted position. A first piston acts on the hollow needle for displacing it to an extended position in which the needle projects from the housing for piercing the skin. A second piston in the receiving chamber acts on the injection liquid to pressurize the same. An apparatus holds the first and second pistons in respective retracted position with a passage connecting the first and second chambers and also being provided with a closure normally closing the passage.

Abstract: A process for the manufacture of articles from a thermoplastic of polyester or polyamide type, preferably of polyethylene terephthalate, the element consisting of an edge part which surrounds a body in an arrangement in which the latter is sunk relative to the edge part. The element is formed from a blank of mainly amorphous material or from a material having a crystallinity of less than 10%. The blank consists, for example, of a flat plate, a blank shell or the like. The body or parts thereof are shaped by stretching the blank until that material flows which is located within the material sections of the blank, which form the edge part in the element, the material stretched up to flowing in the body assuming a crystallinity of between 10% and 25%, while the crystallinity in the material in the edge part and in the unstretched parts retains its original value of less than 10%. At least the body of the element is expanded against warm mould walls until the final shape of the particular article is obtained.

Abstract: A method for providing a container with one or more layers of barrier material during the production of the container from a thermoplastic. A preform (10) is stretched in its axial direction, generally an amount corresponding to the total axial stretching required for conversion of the preform to a container, after which the stretched preform (11, 13) is provided with one or more barrier layers (12, 14), and the preform is then heated and converted to a container. In one embodiment, the axially stretched preform (15) is produced by assembling axially stretched part-preforms (13a,b) covered with one or more barrier layers. The combined preform is then converted to a container.

Abstract: The invention relates to a tubular pre-moulding of a thermoplastic, suitable for subsequent blow-moulding shaping to give containers, and to a process and equipment for producing such pre-moulding. In a tube, future mouth portions and portions of adjacent neck sections are moulded to pre-mouldings, preferably from two mutually joined blank parts, by an axial stretch process and a blow-moulding process, the parts in the transition between the mouth portions being severed in order to form two separate blank parts. A tubular pre-moulding is produced after closing one end of the particular blank part and, if necessary, reworking in order to obtain the requisite closing face at the other end.

Abstract: The invention relates to a method for regulating the phase position of a controlled signal in relation to the phase position of a reference signal in a telecommunication system, and an arrangement for carrying out the method. A reference signal (C2) is delayed in a delay circuit (DL1) and the delayed reference signal (C2) is delayed in a delay circuit (DL1) and the delayed reference signal (D1) is compared with a controlled signal (C1) in a first comparison circuit (FF1) which produces a first comparison signal (Q1) at a high or a low level in dependence on the phase difference between the delayed reference signal (D1) and the controlled signal (C1). The controlled signal (C1) is delayed in a delay circuit (DL2) and the delayed controlled signal (D2) is compared in a second comparison circuit (FF2) with the reference signal (C2).

Abstract: An anti-clamping device for a vehicle door driven in opening and closing movements by a turnable shaft in turn driven by a transmission rod. The anti-clamping device comprises a telescopic element interposed in the transmission rod and including first and second telescopically engaged parts having retracted and extended positions. A control member is mounted on one of the parts and can be in the form of a projecting pin while spaced switches are mounted on the other of the parts. The pin projects between the switches to operate a selected one thereof depending on whether the parts are telescopically retracted or extended to reverse the direction of door movement. Thereby when an obstacle is present in the path of travel of the door, stress in the transmission rod will be accompanied by telescopic retraction or extension of the parts depending upon whether the door is in its opening or closing movement which produces closure of one of the switches to reverse the direction of door movement.

Abstract: Apparatus and method for indicating stress in an object comprising viewing the temperature variation of part of the surface of the object as it is stressed. An infra-red detector detects small changes of temperature and the stress may be applied by natural loading or by cyclic stressing imposed by a vibrator.

Abstract: A membrane switch assembly in which portions of a membrane 14 mounted on a base member 11 are belled-outwardly to provide cavities 15, which are positioned so as to overly the location at which conductors 21, 22 are to be connected. The formation of each belled out portion is such that each portion carries electrical contactor means 16, 20 and such that the portion has a circumscribing region 18 which on compression of the portion to cause switch operation allows the membrane 14 to collapse at this region before the membrane is fully compressed.

Abstract: Ironing, drawing and/or other non chip-producing process is used to form a metal workpiece into an article which is then coated with a protective layer. The lubricating agents used in the non-chip-producing process are removed from the surfaces of the formed article in conjunction with the coating of the article with the protective layer. This is done by dissolving the lubricating agents in the liquid which is used in the application of the protective layer and which contains one or more bonding agents which form the protective layer after the treatment is complete. In one preferred embodiment, at least that protective layer which is closest to the material of the container is applied by electrolytic deposition.