FR2613173A1 - DEVICE FOR MOUNTING PLATES WITH PRINTED CIRCUITS - Google Patents

Abstract

THIS DEVICE FORM AT THE SAME TIME A HEAT DISSIPATOR AND A MEANS OF ASSEMBLY AND SUPPORT OF A CERTAIN NUMBER OF PLATES OR BOARDS WITH PRINTED CIRCUITS. IT IS MADE FROM A BLOCK OF FACTORY METAL TO FORM PARALLEL RIBS 2 CONSTITUTING PINCH SURFACES 3 FOR THE EDGES OF THE PRINTED CARDS. EACH OF THE CARDS IS LOCKED AGAINST A PINCH SURFACE 3 BY A SET 5 OF CORNERS WHICH PRESS AGAINST LOWER FACE 4 OF THE NEXT RIB 2. EACH SET 5 INCLUDES A TERMINAL CORNER 9 WHICH IS MOVABLE BY THE ROTATION OF A SCREW 11 TO PRESS TWO OTHER CORNERS 6, 7 AGAINST THE PRINTED CARD AND LOCK IT THUS BY ITS EDGE AGAINST PINCHING FACE 3 OF NEIGHBOR RIB 2.

Description

This invention relates to improvements in devices.

  positive for mounting plates or printed circuit boards.

  British patent application no. 8525721 of the application

  deresse, published under the number 2166004A, describes and represents a mounting device for a plate or a printed circuit board, which comprises a base with a fixed part having inclined opposite surfaces, which is traversed by a hole for receiving a screw, as well as two movable parts forming corners and comprising threaded parts with a right and a left pitch, the arrangement being such that the rotation of the screw causes the corners to rise or fall on the surfaces bevel of the fixed part. The hole allows the screw and the fixed part to move transversely to the axial direction of the screw. The rotation of the screw thus causes the relative displacement of the movable corners and of the fixed part, transverse to the axial direction of the screw, with the result that the printed circuit board is pressed against a nipping surface by

  the fixed part to which the plate is attached.

  Such a device is provided for an edge of a single

  plate or card; if it is a question of mounting a group of printed cards

  Even if they are to be placed in parallel, there will be as many pairs of these devices as there are cards, to hold two opposite edges of

each card.

  As an opening or a drawer of printed cards gives off heat during operation, the invention aims to provide a device making it possible to mount several printed cards of

  way to help dissipate heat.

  According to the invention, a device for mounting several plates or printed circuit boards is characterized in that it comprises a plate, bars or pinching ribs, extending parallel at a distance from each other and projecting from the plate , with which they are in one piece, each rib forming a nip face on one side and a

  support side on the other side, as well as a set of operating corners

  between each support face and a printed circuit board, placed against the gripping face of the neighboring rib, to

  block the printed card against this nip face.

  Other characteristics and advantages of the invention

  will emerge more clearly from the following description of a

  currently preferred but in no way limitative embodiment, as well as of the appended drawing, in which: - Figure 1 is a side elevation view with cutaway and parts shown in section, of a device

  according to the invention for mounting a stack of mutual printed cards-

  spaced apart by their neighboring edges; and

  - Figure 2 is an end view of this device.

  The device shown comprises a metal plate 1 which can be fixed against the internal face of the wall of a rack or a box for example for printed circuit boards, or itself constitute such a wall. The plate 1 carries parallel pinch bars or ribs 2 which protrude from the plate and are integral with it. The plate and the ribs are preferably machined from a block of solid metal, for example of aluminum alloy. One face 3 of each rib 2 forms a nip face, while the other face 4 of each rib is hollowed out to receive a set 5 of corners. This face 4

  constitutes a bearing face on which the set 5 of corners bears.

  In the embodiment shown, each set 5 has an end corner 9 and three other corners 6, 7, 8. The end corner 9 is axially displaceable along a screw 11 which is only screwed into this end corner and is mounted to can

  freely rotate by its two ends in the clamp rib

  concerned. The end face 10 of the hollow, formed in each rib, is an oblique surface or bevel which is symmetrical to the bevel directed towards it from the end corner 9. The bevel 10 extends in

  direction of the gripping face 3 of the adjacent rib 2.

  The corners 6, 7 and 8 each have a hole 13 through which the screw 11 of the set of corners concerned passes, with sufficient freedom, of the external corners 6 and 7 at least, so that the latter can be moved laterally relative to the '' axis

  the screw, in the direction of reentry and exit of the hollow concerned

  born from the pinch rib. A suitable spring, in this case a flat spring 14, spreads the corners of the screw 11 in the direction of

  their sinking into the hollow of the rib.

  To fix a stack of printed circuit boards, two plates 1 are installed on the inner side of opposite walls of a cabinet, a rack or the like, or the two plates 1 are arranged so that they themselves constitute the opposite walls of such a piece of furniture, with the pinching ribs directed towards each other and with the exposed ends of the screws - which may be hexagon socket heads or heads with a slot for a screwdriver for example - located on the same side of the cabinet. Turn the screws 11 to allow the springs 14 to penetrate the corners as far as possible into the recesses

  ribs, in order to space them from the pinch faces 3 corres-

  laying ribs 2 located in front of them, which creates slots S, then we slide each printed card into two opposite slots S. After that, the screws are turned to pull the end corner 9 towards the fixed bevel 10. The corners 6, 7 are therefore pushed out of the hollow, towards the opposite faces of the slots S, with pinching of the inserted edges of the cards in the slots. Each movable corner 8 moves along its screw, in accordance with the movements

  other corners threaded on the screw in question. The maximum width

  male of a slot S is indicated at 16, where the end corner 9 occupies its position furthest from the fixed bevel 10 and the spring 14 is relaxed. The minimum width of a slot is indicated in 17, where the end corner is approached to the maximum of the fixed bevel and the spring

is completely compressed.

  Each plate with its pinch ribs form a heat sink; the corner sets 5 are preferably in

  metal to produce even greater heat dissipation.

  In addition, the plates 1 can be provided with fins on their

  external surfaces, if the plates constitute external walls

  rieures, or the external faces of the plates can define, with the walls of a box, a bay or another piece of furniture, or in combination with external plates provided in addition, a path

  for circulation of a heat exchange fluid.

  The hollows which receive the sets of corners, as well as the latter, are each represented with sharp angles at the base of the inclined faces. These angles can be rounded for manufacturing.

Claims (7)

  1. Device for mounting several plates or printed circuit cards, characterized in that it comprises a plate (1),   pinch bars or ribs (2), extending parallel-   spaced apart from each other and protruding from the plate   (1), with which they are integral, each rib forming   mant a gripping face (3) on one side and a bearing face (4) on the other side, as well as a set (5) of maneuverable corners between each bearing face (4) and a card printed circuits, placed against the gripping face (3) of the neighboring rib (2), to   block the printed card against this nip face.   2. Device according to claim 1, in which each bearing face (4) comprises a bevel (10) extending in the direction of the gripping face (3) of the neighboring rib (2), and in which each set (5) of corners has a terminal corner (9) which can be slid along the bearing face (4) and which has an oblique surface forming a bevel symmetrical to the bevel (10) of the face of support, as well as at least one other corner (6, 7, 8), placed between these bevels and which is forced by them to move towards the printed card when the terminal corner (9) is approached from the bevel (10) of the bearing face.   3. Device according to claim 2, comprising three corners (6, 7, 8), placed between said bevels, whose central corner (8) is supported on the bearing face (4) and whose two outer corners (7 , 8) are forced to move towards the printed card when the terminal corner (9) is approached the bevel (10) of the bearing face. 4. Device according to claim 2 or 3, wherein the end corner (9) is connected to the pinch rib (2) corresponding by a screw (11) which can be rotated to move   the end corner (9) along the bearing face (4).   5. Device according to claim 4, wherein the screw (11) passes through the corner or each of the corners (6, 7, 8) disposed between   the end corner (9) and the bevel (10) of the bearing face (4).   6. Device according to any one of the claims   above, in which each bearing face (4) is formed by a   hollow machined in the corresponding pinch rib (2).   7. Device according to any one of the claims   previous, in which the plate (1) and the pinching ribs (2) are made of a single metal piece and each set (5) of corners consists of metal corners, so that the ribs and the corners (6 , 7, 8, 9) transmit heat from the plate or printed circuit board to the plate (1), acting as a heat sink.