摘要:
Power tools with conductive couplings used with active injury mitigation technology are disclosed. Conductive couplings are particularly relevant to table saws, hand-held circular saws, track saws, miter saws, and band saws with active injury mitigation technology. Conductive couplings provide a mechanism through which an electrical signal can be coupled or imparted to a blade, and then monitored for changes indicative of human contact with the blade. An exemplary conductive coupling includes a brush that establishes an electrical connection with a moving part of a power tool, and the brush maintains contact with the moving part of the power tool during at least 40 hours of cumulative time when the motor is spinning the arbor and blade without an interruption in the electrical connection sufficient to trigger the reaction system. A conductive coupling may be two-sided compliant. A conductive coupling may connect to a motor shaft to minimize electrical noise.
摘要:
A method of making contact wires (200, 201, 202, 300, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 440) for sliprings (160) comprising the steps of:
coating and/or plating a wire with a first metal of the group of nickel, chrome or a combination thereof;
coating and/or plating the wire with a second metal of the group of gold, silver, or a combination thereof;
delivering laser radiation (611, 612) and generating an interference pattern of the laser radiation to the surface of the wire;
heating the surface selectively as defined by the interference pattern, modifying of the crystal structure and/or providing protrusions and/or recesses d ue to melting and/or evaporation of the surface material.
摘要:
L'invention concerne un balai (1) pour machine électrique tournante, comprenant une face de contact (10) apte à venir en contact frottant avec une lame (21) de collecteur cylindrique (2) monté mobile en rotation autour d'un axe (R) fixe, ladite face de contact (10) présentant un contour fermé comprenant : - une première portion frontale (11) amorçant le contact entre ladite lame (21) et ledit balai (1) ; - une deuxième portion dorsale (12) terminant le contact entre ladite lame (21) et ledit balai (1) ; ledit balai (1) présentant une largeur maximale (L) sur ladite face de contact (10), mesurée parallèlement audit axe de rotation (R) dudit collecteur. Ladite portion dorsale (12) présente une dimension (D1) supérieure à ladite largeur maximale (L) du balai et ladite deuxième zone est fabriquée en un matériau de résistivité plus grande que le matériau de la dite première zone.
摘要:
The invention relates to a spring contact for a sliding contact having a terminal region (24) and at least one contact region comprising an elongated spring element and a precious metal, wherein the spring contact comprises a conductive spring support (1, 11, 21, 31) and at least one contact piece (2, 12, 22, 32), wherein the spring support has a substantially symmetrical rigidity in some regions in a plane perpendicular to the elongated extent of the spring support and is made from a conductive material, substantially free of precious metal and wherein the at least one contact piece is conductively connected to the spring support, and comprises at least one surface to form the sliding contact and the material of the surface of the contact piece comprises a precious metal or a precious metal alloy. The invention also relates to a slip ring transmitter comprising such a spring contact, wherein the surface of the contact piece(s) is/are conductively connected to the slip rings, and also relates to a motor and a dynamo having such a slip ring transmitter.
摘要:
The invention relates to a fuel pump which comprises an electric motor. Said electric motor is provided with carbon brushes (11) that cover a plurality of lamellae (17) of a collector (9). Grooves (7) in an armature (6) include sections of a plurality of coils (8), thereby particularly reducing erosion of the carbon brushes (11).
摘要:
A first carbon brush which comprises a graphite powder as a filler having a particle diameter distribution curve as determined by the laser diffraction method wherein an integrated value for the number of graphite particles having a particle diameter of 5 mum or less accounts for 10 % or less of the total particles, preferably 5 % or less; a second carbon brush which is the first carbon brush further wherein an integrated value for the number of graphite particles having a particle diameter of 100 mum or more accounts for 10 % or less; a third carbon brush which is the second carbon brush further wherein an integrated value for the number of graphite particles having a particle diameter of 10 to 40 mum accounts for 60 % or more; a forth carbon brush which is the third carbon brush further wherein an integrated value for the number of graphite particles having a particle diameter of 12 to 20 mum accounts for 40 % or more.