Device for fixing a mirror holder to an adjustment mechanism

Abstract: A device for fixing a mirror cover (2) to a control mechanism (3) in a rear view mirror has at least three fixing parts disposed at an opening (6) of the mirror cover (2) . Each fixing part has a flange (40) which carries a cuneiform projection or wedge (41) which is arranged to be coupled to a groove (32) formed in a ring (30) at the base of the control mechanism (3) . A stop (44) is provided on the mirror cover (2) and the flange (40) and stop (44) each have gutters (42 , 45) , which together with a hole (43) in the mirror cover (2) , form a seat which receives a pin (46) under pressure and presses the cuneiform projection or wedge (41) against the groove (32) to promote fixing of the control mechanism (3) to the mirror cover (2) .

Description: The present invention relates to a rear view mirror of automotive vehicles and, in particular, to a fixing device for fixing a mirror cover to a control mechanism for adjusting the position of the mirror. US-A-4 981 279 describes a device for fixing a mirror cover to a control mechanism comprising several spaced apart fixing parts and a universal gasket, the universal gasket being carried on the base of the control mechanism and having a groove, each fixing part comprising a flange carried on the edge of an opening in the mirror cover for supporting the base of the control mechanism, the flange having a wedge-shaped projection being arranged so as to couple with the groove. External rear view mirrors of large size automotive vehicles, such as trucks, buses and the like, are already known, and essentially comprise a mirror plate set and a control mechanism for adjusting the position of the mirror, a mirror cover to which is fixed the mirror plate set and control mechanism, a housing which accommodates the control mechanism and mirror plate set together with other associated components and a support with its inside fixed to the body of the automotive vehicle so as to support the housing. The mirror cover comprises a plate with one of its sides fixed to the mirror plate set and has a wide central circular opening in which is disposed the control mechanism which allows the adjustment of the mirror position either by manual actuation or by using an electric motor device. The control mechanism includes a universal gasket which has one part in the form of a ring shaped base to which is fixed the mirror cover using a fixing device and another part which is fixed in the bottom of the housing. In the usual form of construction, the fixing device for fixing the control mechanism to the mirror cover is formed by at least three parts each in the form of a resilient hook and/or metallic spring which remain seated one to the other and are assembled in the control mechanism and mirror cover to one another. Such fixing device is a complex structure, inconvenient and undesirable. Another inconvenience of conventional fixing devices is that their assembly on the production line is difficult and undesirable. Another problem concerns vibration of the mirror when it is in use. Vibration leads to the fatigue of the material of the fixing device and jeopardizes the optimum functioning of the mirror. An object of the present invention is to provide a fixing device that alleviates the above problems. Another object is to provide a fixing device that does not require substantial modifications to the mirror so as not to complicate the production process. Yet another object is to provide a fixing device that can be obtained using simple resources and at low cost. The present invention consists of a device for fixing a mirror cover to a control mechanism comprising at least three spaced apart fixing parts and a universal gasket , the universal gasket being carried on the base of the control mechanism and having a ring and a groove formed in the periphery of the ring , each fixing part comprising a flange carried on the edge of an opening formed in the mirror cover for supporting the base of the control mechanism , a stop projecting from the mirror cover and radially aligned and spaced apart from the flange, a seat comprising gutters and formed in the opposing faces of the flange and the stop and a hole formed in a region of the mirror cover within the space between the flange and the stop, and a pin, the flange having a cuneiform projection or wedge being arranged so as to couple with the groove of the ring and the pin being received under pressure through the hole and between the gutters and so as to press the projection against the groove of the ring when the projection is coupled with the groove. An embodiment of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:- Fig. 1 shows an exploded view of a mirror in which an embodiment of the present invention is used; Fig. 2 shows a partial exploded view of the fixing device according to the embodiment of the present invention; and Fig. 3 shows a partial cross-sectional view of the fixing device of Fig 2. assembled together. Referring to the accompanying drawings, there is shown an embodiment of the present invention for use in an external rear-view mirror assembly of an automotive vehicle, such as a truck, bus or the like. The rear-view mirror assembly includes a mirror plate set 1, a mirror cover 2 in which is fixed the mirror plate set 1, a control mechanism 3 for adjusting the positioning of the mirror plate set 1, a fixing device 4 for fixing the mirror cover 2 to the control mechanism 3, a housing 5 in which is fixed the control mechanism 3 and which accommodates associated components and a support (not illustrated) for fixing to the automotive vehicle to which is fixed the housing 5. The mirror cover 2 comprises a plate with one of its sides fixed to the mirror plate set 1 and which has a wide circular opening 6 in which part of the control mechanism 3 is disposed. The control mechanism 3 includes a universal gasket at its base in the form of a ring 30 which is fixed to the mirror cover 2 using the fixing device 4 and has another part 31 which contains a device for adjusting the position of the mirror plate manually or electrically and which is fixed in the bottom of the housing 5. The fixing device 4 is formed by at least three fixing parts, which are regularly distributed around the opening. In the illustrated embodiment four fixing parts are provided. In the present invention, each fixing part comprises; a flange 40 of "L" shaped cross section disposed on the edge of the opening 6 of the mirror cover 2 and is formed by an axial section which projects perpendicularly to the geometric axis of the opening 6 from the side of the mirror cover 2 which opposes the side receiving the mirror plate set 1. The flange 40 is arranged so that it is disposed adjacent to the ring 30 of the control mechanism 3 and has a radial section which radially projects inward into the opening 6 so as to support the ring 30. The side of the axial section of the flange 40 which is directed to the ring 30 has a cuneiform projection or wedge 41 which is coupled to a corresponding groove 32 formed in the ring 30 and the opposite side of the axial section has a gutter 42 extending in a direction which is parallel with the geometric axis of the opening 6. The fixing part also comprises a crossing hole 43 made in the mirror cover 2 and adjacent to the gutter 42 and a stop 44 which projects from the side of the mirror cover 2 which is opposite the side which receives the mirror plate set 1 and which is radially aligned to and spaced from the flange 40 in correspondence with the hole 43 of the mirror cover 2. A complementary gutter 45 in parallel with the gutter 42 is disposed on the side of the stop 42 which faces the flange 40. A pin 46 is received under pressure in the hole 43 of the mirror cover 2 and in the seat defined by the gutters 42 and 45 of the flange 40 and the stop 44 and compresses the cuneiform projection or wedge 41 of the axial section of the flange 40 against the peripheral groove 32 of the ring 30 of the control mechanism 3, thus securing the control mechanism 3 to the mirror. The cuneiform projection or wedge 41 has a surface 47 at its side which is directed to the side from which the control mechanism is introduced and which is inclined and descends in the direction of the center of the opening 6. The mirror cover 2, fixing device 4, gasket 30-31 of the control mechanism 3, housing 5 and other associated components are obtained from the usual plastic material used in the manufacture of rear-view mirrors. In order to fix the cover mirror 2 to the control mechanism 3, the ring 30 of the control mechanism 3 is introduced within the flange 40 of each of the fixing parts and passes over the inclined sides 47 of the cuneiform projections or wedges 41 of the flanges 40 so as to force the cuneiform projections or wedges 41 to flex sufficiently to allow the groove of the ring to be disposed next to the cuneiform projections or wedges 41 so that the cuneiform projections or wedges 41 couple with the groove. The pins 46 are then introduced under pressure through the holes 43 and into the seats defined by the gutters 42, 45 radially forcing against the flanges 40 and the corresponding stops 44 so as to make them slightly bend and consequently force the cuneiform projections or wedges 41 towards the ring 30 so to provide a more intimate coupling with the groove 32 of ring 30 of the control mechanism 3, and thereby complete the connection between the control mechanism 3 and the mirror cover 2. The fixing device of the present invention solves the problems of a conventional fixing device because its construction and assembling is simpler than for the conventional fixing device. An advantage of the present invention is that the fixing device is not affected by vibration during the course of the useful life of the mirror. The fixing device of the present invention has components which are made from a suitable material and has an adequate structure in order to avoid the fatigue and loosening of the connection formed by the fixing device. Another advantage of the present invention is that the manufacturing process of the mirror is not significantly complicated.

Claims: A device for fixing a mirror cover (2) to a control mechanism (3), comprising at least three spaced apart fixing parts and a universal gasket , the universal gasket being carried on the base of the control mechanism (3) and having a ring (30) and a groove (32) formed in the periphery of the ring (30), each fixing part comprising a flange (40) carried on the edge of an opening (6) formed in the mirror cover (2) for supporting the base of the control mechanism (3), a stop (44) projecting from the mirror cover (2) and radially aligned and spaced apart from the flange (40), a seat (42, 43, 45) comprising gutters (42, 45) formed in the opposing faces of the flange (40) and the stop (44) and a hole (43) formed in a region of the mirror cover (2) within the space between the flange (40) and the stop (44), and a pin (46), the flange (40) having a cuneiform projection or wedge (41) being arranged so as to couple with the groove (32) of the ring (30) and the pin (46) being received under pressure through the hole (43) and between the gutters (42, 45) so as to press the projection against the groove (32) of the ring (30) when the projection is coupled with the groove (32). A fixing device as claimed in claim 1, wherein the flange (40) is substantially of "L" shaped cross section and has an axial section which projects substantially perpendicular from the side of the mirror cover (2) which is opposite to the side which receives a mirror plate set (1) and a radial branch which radially projects inside the opening (6) so as to support the perimeter of the base of the control mechanism (3). A fixing device as claimed in claim 2, wherein the cuneiform projection or wedge (41) is formed on the face of the axial section and directed to the base of the control mechanism (3). A fixing device as claimed in claim 2 or 3, wherein the gutter (42) is formed on the axial section of the flange and extends in a direction parallel to the geometric axis of the opening (6). A fixing device as claimed in claim 2, 3 or 4, wherein the pin (46) when received in the seat (42,43,45) compresses the cuneiform projection of wedge (41) of the axial section of the flange (40) against the peripheral groove (32) of the ring (30) promoting the fixing of the control mechanism (3) to the mirror cover (2) A fixing device as claimed in any preceding claim, wherein the hole (43) is intercalated and arranged so that the hole and the ends of the gutters (42, 45) are aligned. A fixing device as claimed in any preceding claim, wherein the stop (44) is projected from the side of the mirror cover (2) which is opposite to the side which receives the mirror plate set (1) and its face, which is directed to the flange (40), is provided with the gutter (45) in parallel with and complementary to the gutter (42). A fixing device as claimed in any preceding claim , wherein at least some of the surface of the cuneiform projection or wedge (41) which is directed to the side from which the control mechanism (3) is introduced is inclined and descending from the periphery to the centre of the opening (6). A mirror assembly comprising a mirror cover (2) , a mirror plate (1) fixed to one face of the mirror cover (2), the mirror cover (2) having a central circular opening (6) in which is disposed a control mechanism (3), the control mechanism (3) having one part in the form of a kind of universal gasket at the base of the control mechanism (3) which is in the form of a ring (30) and which is fixed to the mirror cover (2) using a fixing device (4) and another part (31) which contains the device for adjusting the position of the mirror plate (1) either manually or electrically and which is seated in the bottom of a housing (5) of the mirror, whereby the fixing device (4) is formed by at least three regularly spaced apart fixing parts, each fixing part comprising a flange (40) disposed on an edge of the opening (6) of the mirror cover (2) adjacent and supporting the base of the control mechanism (3), the flange (40) having a cuneiform projection or wedge (41) which couples with a groove (32) of the ring (30), and in that a stop (44) projects from the mirror cover (2) and is radially aligned with and spaced apart from the flange (40) and in that the fixing device includes a seat (42, 43, 45) comprising gutters (42,45) formed in the opposing faces of the flange (40) and the stop (44) and a hole (43) formed in a region of the mirror cover (2) within the space between the flange (40) and the stop (44), and a pin (46), the flange (40) being arranged so as to couple with the groove (32) of the ring (30) and the pin (46) being received under pressure through the hole (43) and between the gutters (42, 45) so as to press the projection against the groove (32) of the ring (30) when the projection is coupled with the groove (32).

Inventors: MIYABUKURO PEDRO TAKASHI, MIYABUKURO, PEDRO TAKASHI, Miyabukuro, Pedro Takashi, Rua das Moncoes 61,
Applicants: METAGAL IND & COMERCIO, METAGAL INDUSTRIA E COMERCIO LTDA.
Application year: 2001
Main classification: B60R1
IPC codes: B60R1