Patent EA-001151-B1 (EA)
Title: Contact device
Inventor: ERIKSSON BJORM
IPC: H01H1/38
Filed: 1997-05-14
Abstract: 1. A contact device for electrical connection between two sections (1, 2) of a current path which are displaceable in relation to each other, said device comprising a first and a second contact member (3, 4) each fixed to one of the sections (1,2) of the current path, and an elongated push-on contact device (7) supported by the first contact member (7), said push-on device together with the first contact member (3) being displaceable in its longitudinal direction between an open position, in which the two contact members (3, 4) are electrically separated from each other, and a closed position, in which the push-on contact device (7) connects the two contact members (3, 4) wherein the contact members (3, 4) exhibit partially ball-shaped end portions (5, 6) with convex contact surfaces, and the push-on contact device (7) comprises at least three contact fingers (8), fixed relative to each other in a preferably rotationally symmetrical configuration by a waist (9) attachment arranged at the mid-portion of the contact fingers, said waist attachment being articulately attached to said first contact member (3), the contact fingers (8) being adapted to make contact, in the closed position under contact pressure, with the convex contact surfaces of the contact members (3, 4). 2. A contact device according to claim 1, characterized in that the contact fingers (8) are made of a low-resistant material with good resilient and corrosion properties, for example chromium zirconium copper and beryllium copper. 3. A contact device according to claim 1 or 2, wherein the partially ball-shaped end portion (5) of said first contact member (3) has a centrally disposed cavity, in which said waist (9) attachment is articulately journalled by a ball-type bolt (14) extending in the longitudinal axis of the push-on contact device (7). 4. A contact device according to claim 1, 2 or 3, wherein the waist attachment (9) comprises a preferably circular disc (10) which along its periphery is provided with through-holes (12) for fixing the contact fingers (8), the holes (12) being obliquely directed towards the plane of the disc (10) so that the contact fingers (8) in the open position are inclined slightly inwardly towards the insertion direction. 5. A contact device according to claim 1, 2 or 3, wherein the waist attachment (9) comprises three parallel and preferably circular discs (19, 20, 21), which through a central body (18) are fixed relative to each other at an axial distance so that a center plate (21) is placed between two end plates (19, 20), the two end plates (19, 20) along their periphery being provided with through-holes (23) and/or members for fixing the contact fingers (8), whereas the diameter of the center plate (21) is adapted so that, when clamping the contact fingers (8) to the waist attachment (7), the two ends of the fingers (8) are bent inwardly towards the center line of the push-on contact device (7). 6. A contact device according to any preceding claim, wherein the push-on contact device (7) has a funnel-shaped end portion (24) for guiding towards said second contact member (4). 7. A contact device according to any preceding claims, wherein said second contact member (4) is provided with a guiding cone (25) of electrically insulating material.