Abstract:
Thermoformage d'une pièce de matière plastique notamment en plaque. Selon l'invention, l'unité de thermoformage comprend au moins deux moules (2, 3) dont les formes respectives permettent de faire évoluer progressivement la forme de la matière (1) mise en oeuvre, jusqu'au moule final donnant la forme voulue. Dans le procédé correspondant, on fabrique une pièce mince en matière plastique par les étapes suivantes : On réalise au moins une étape intermédiaire de thermoformage, en utilisant au cours de celle(s)-ci au moins un moule intermédiaire, la ou les forme(s) du ou des moule(s) intermédiaire(s) permettant de faire évoluer progressivement la forme de la matière mise en oeuvre, On réalise une étape finale de thermoformage au cours de laquelle un moule final permet l'obtention de la forme voulue.
Abstract:
The invention concerns a rear connection device for a screened cable connector, said device comprising a sheath having an external diameter (D1), one or a plurality of screening braids with a diameter (D2) and a plurality of electrical leads. The device further comprises: a part (54) for continuing the screening, with a sleeve (70) having an external diameter substantially equal to D2 for securing the braiding, a first support section (76) and an axial bore (78) through which the electrical leads can be passed; a securing part (52) defining a cavity which is open at a first end (60) for securing to the connector and closed by a wall (58) defining a second bearing section (64) inside the cavity and having an axial aperture (62) whose diameter is at least equal to D1, the screening continuation part being able to penetrate the cavity freely; and a nut (56) for rendering the continuation part and securing part integral with each other.
Abstract:
A device for electrically testing an electrical connection harness (10), including an electrical signal generator (24) and a measuring apparatus (22) connected via two switches (26, 28) to the branch lines (16) of the harness through 'consumer' cards (30) simulating the conditions of components that may be mounted on the branch lines. A control assembly (32, 38) enables the switches (26, 28) and 'consumer' cards (30) to be controlled to simulate various component configurations (transmitter, receiver, standard load, short-circuit, open line).
Abstract:
L'invention concerne un câble plat comprenant, au moins un conducteur longitudinal (C, C) intercalé entre, au moins deux couches d'un matériau isolant et éventuellement d'un matériau de blindage, caractérisé en ce que lesdites couches sont constituées par des plis (R 0 , R 1 , ...) longitudinaux, autour du conducteur (C, C'), en une ou plusieurs épaisseurs d' au moins un ruban (1) de garnissage réalisé, au moins partiellement, avec une matière thermostable et enduit, sur au moins sa face interne, avec un adhésif thermofusible.
Abstract:
A device for electrically testing an electrical connection harness (10), including an electrical signal generator (24) and a measuring apparatus (22) connected via two switches (26, 28) to the branch lines (16) of the harness through "consumer" cards (30) simulating the conditions of components that may be mounted on the branch lines. A control assembly (32, 38) enables the switches (26, 28) and "consumer" cards (30) to be controlled to simulate various component configurations (transmitter, receiver, standard load, short-circuit, open line).
Abstract:
A method for producing a polytetrafluoroethylene (PTFE) tape with a density no greater than 0.3 g/cm3, wherein a first stretching step is carried out on a raw PTFE tape (A, B) to reduce its density to 0,7-0,3 g/cm3, whereafter a step of the kind comprising a stabilization phase is performed on the tape without altering the state of the PTFE, by passing said tape through an oven (F2) at a temperature and for a time which are dependent on the mass to be stabilized, the tape being held taut to prevent any increase in density. The tape is then hot-stretched to reduce the density to a value of 0.2-0.12 g/cm3. Said porous PTFE tape is useful particularly as an insulating covering for a coaxial cable.
Abstract:
The invention relates to a device for connecting at least one braid of electric cables to a connector. The device is comprised on the one hand of a yoke (30) provided with a slot and, on the other hand, of a metal strip (24) of constant thickness and width. The extremity (28) of the strip (24) is backfolded to one edge (34) of the yoke (30) whereas the other extremity (26) of the strip (24) passes twice into the slot in order to form two turns (42, 44) around the braid (38). The extremity (26) is then backfolded to the flange (36) of the yoke (30) and severed.
Abstract:
The coating is comprised, according to an embodiment, of a first inner layer (2) of glass fibres including mica particles surrounding the lead, the pipe or the conduit (1) of a second layer (3) of the same nature as the preceeding layer but crossed therewith, of a third layer (4) consisting of a polymer charged with inorganic compounds of the refractory type, of a fourth layer (5) consisting of a braid of glass fibres coated with resin, and a fifth layer (6) of thermostable polymer charged with refractory inorganic material. When the coating is subjected to a temperature higher than 950oC, the organic parts are decomposed and the inorganic parts are melted to give a foam which vitrifies and enables to maintain the sealing and the electric insulation.
Abstract:
L'invention concerne un câble coaxial destiné à la transmission de signaux de très hautes fréquences. Ce câble coaxial comporte une couche de matière isolante diélectrique constituée de polytétrafluorométhylène ou d'une composition comportant au moins 80% de ce produit nommé ci-après COMPOUND. La couche de matière isolante est obtenue directement par extrusion à froid d'une poudre de COMPOUND, du mélange intime d'un agent porogène et d'un agent d'expansion et d'une essence de lubrification. Le mélange de la poudre de COMPOUND, de l'agent porogène et de l'agent expanseur s'effectue à sec ou en dispersion aqueuse. Principale application: Domaines d'utilisation des hyperfréquences tels que radar et transmissions.