BREAK-AWAY MIRROR MECHANISM

Abstract: In this invention a motor vehicle rear vision mirror mounting bracket (11) has a hinge member (20) which stands out away from an outer face (19) of the bracket, and a rear vision mirror assembly (10) has lugs (21) with notches (22) which engage the hinge member (20) and allow the mirror assembly (10) to hinge without contact being made between the mirror case (15) of the assembly (10) and the mounting bracket (11), thereby avoiding scuffing of the mirror case (10).

Description: This invention relates to a rear vision mirror for a motor vehicle, of the type comprising a mounting bracket having an outer face with a front edge and a rear edge with respect to said vehicle, a pair of vertically spaced guide projections projecting from the outer face near said rear edge, a mirror assembly including a mirror case having a front wall and pivoting surfaces located so as to engage said guide projections upon rearward break-away of the mirror assembly from the mounting bracket, hinging means detachably coupling the mirror assembly to the mounting bracket and comprising a hinge member and a pair of vertically spaced notches which engage over the hinge member upon forward break-away to provide a hinging axis near said front edge and spaced outwardly away from the outer face, and a spring co-acting between the mounting bracket and the mirror case to allow the mirror assembly to break away from the mounting bracket upon impact, in a direction which is either forward or rearward with respect to the vehicle. A rear vision mirror of this type is described in DE-U-8 709 610. A number of difficulties are encountered in the design and construction of such mirrors. In order to satisfy styling requirements, the mirror cases are usually curved in both lateral and vertical planes, and hinging which takes place with most known mirrors tends to scuff the outer (polished) surface of the mirror case, particularly in a forward break-away movement. One object of this invention is to provide an improvement whereby a mirror case can move through a forward break-away hinging movement, and remain clear of the mounting bracket until the end of such movement, so that surface damage due to scuffing is unlikely to occur under most break-away conditions. Another problem which is encountered is that, in the past, there has been a requirement for close tolerances, which requirement therefore adds to production costs. This particularly applies when there are four contact points between the mirror case and the mounting bracket, so that two contact points exist during any breakaway movement. If the contacts between these elements should be four in number when the mirror housing is in its viewing position, but due to inaccuracy only three contact points are made, the mirror case can be "loose" and vibrate. According to the invention, in a rear vision, mirror for a motor vehicle, of the type described above, the spring causes the mirror case to bear against the mounting bracket (in its viewing position) at only three spaced contact points, two of said three contact points being surfaces of the vertically spaced projections and the third being a support projection on the front wall which abuts against a ramp surface on the mounting bracket adjacent the hinge member. The more widely spaced the support points are of course, the more is the stiffness achieved for retaining the mirror in its normal viewing position. An embodiment of the invention is described hereunder with reference to the accompanying sketches in which: Figure 1 is a plan view which illustrates the normal viewing position of a rear vision mirror, the rearward break-away position and the forward break-away position; Figure 2 is a front elevation of Figure 1; Figure 3 is a section taken on line 3 - 3 of Figure 2, showing the rearward break-away operation, Figure 3 being drawn to a larger scale than Figures 1 and 2; Figure 4 is a view which corresponds to Figure 3, but which shows the mechanism when the mirror is in the viewing position; Figure 5 shows the forward break-away movement; Figure 6 is drawn to a smaller scale than Figures 3, 4 and 5, and shows the forward break-away position in elevation; Figure 7 is a perspective view of a mounting bracket which has a moulded portion which performs the function of the pivot wire in the first embodiment; and Figure 8 is a fragmentary section of a mirror assembly on plane 8 - 8 - 8 of Figure 7. In the first embodiment of Figures 1 to 6, a rear vision mirror assembly 10 is carried on a mounting bracket 11 for mounting externally on a motor vehicle , the mounting bracket 11 being provided with a pair of projections 12 constituted by two vertically spaced lugs near the rear edge of its outer face 19, as seen in Figure 6. These projections in the normal viewing position of Figure 4 engage locating surfaces 16, and a pair of rear pivoting surfaces 14 of the mirror mounting case 15. The surfaces engaged have such a slope that they tolerate considerable displacement from normal position and yet reseat correctly. Upon rearward break-away (Figure 3), there is an initial guidance by webs 16 of the mirror mounting case 15 which engage curved surfaces of the projections 12 and may be seen in Figure 4. Further breakaway to the maximum position takes place by a hinging movement between edges of the pivoting surfaces 14 and the projections 12. Vertical stability is achieved by the stops 29 as best seen in Figure 6. The bracket 11 has an outer face 19, and in order to provide hinging means for forward break-away which will not in any way mar the outer surface of the case, the bracket 11 carries a hinge member, being a U-shaped hinge wire 20 which projects outwardly from face 19 near its front edge, and is engaged by recesses or notches 22 in a pair of hinging lugs 21 which constitute hinging means and project from the inner wall 13 of the mirror mounting case 15, and hinge about axis A which is spaced away from face 19, the surfaces of notches 22 engaging wire 20. Lugs 21 are so spaced from one another as to provide stability also in a vertical plane. The hinging axis A is further out from face 19 than from the inner edge of the front wall 23 of he case 15 so that as hinging takes place a clearance exists between the outer surface of the front wall 23 of the case 15 and the face 19 and it is this clearance which avoids possible scuffing. When however the mirror case 15 returns to its viewing position (Figure 4) a single projection 24 on the inner edge of the front wall 23 rides up the ramp surface 25 and engages in a small notch 26 (Figure 3) near the end of that surface. Spring 28 effects this return. Thus the mirror again becomes supported on three points only, and is gradually led,into the correct location. These two features eliminate the need for close tolerances which are presently used. The second embodiment of Figures 7 and 8 is generally similar to the first, the main exception being that the hinge member in the first embodiment is a hinge wire 20, but in the second comprises a hinge bracket moulding 30 having a pair of spaced co-axial moulded hinge pins 31 and 32 which are engaged by respective notches 22 in lugs 21. In other respects, similar elements bear similar designations.

Claims: A rear vision mirror for a motor vehicle, comprising a mounting bracket (11) having an outer face (19) with a front edge and a rear edge with respect to said vehicle, a pair of vertically spaced guide projections (12) projecting from the outer face (19) near said rear edge, a mirror assembly (10) including a mirror case (15) having a front wall (23) and pivoting surfaces (14, 16) located so as to engage said guide projections (12) upon rearward break-away of the mirror assembly (10) from the mounting bracket (11), hinging means detachably coupling the mirror assembly (10) to the mounting bracket (11) and comprising a hinge member (20, 30) and a pair of vertically spaced notches (22) which engage over the hinge member (20, 30) upon forward break-away to provide a hinging axis near said front edge and spaced outwardly away from the outer face (19), and a spring (28) co-acting between the mounting bracket (11) and the mirror case (15) to allow the mirror assembly to break away from the mounting bracket (11) upon impact, in a direction which is either forward or rearward with respect to the vehicle; characterised in that the spring (28) causes the mirror case (15) to bear against the mounting bracket (11) (in its viewing position) at only three spaced contact points, two of said three contact points being surfaces of the vertically spaced projections (12) and the third being a support projection (24) on the front wall (23) which abuts against a ramp surface (25) on the mounting bracket (11) adjacent the hinge member (20, 30). A mirror according to claim 1, wherein the ramp surface (25) terminates in a notch (26) near said front edge, and said support projection (24), upon return of the mirror assembly (10) from its forward break-away position to its viewing position, rides over the ramp surface (25) and engages the notch (26). A mirror according to claim 2 wherein said hinge member is a hinge wire (20), and said hinging lugs (21) are so spaced that they locate the mirror case (15) with respect to the bracket (19) in a vertical plane when the mirror is in a viewing position. A mirror according to claim 2 wherein said hinge member (20) is a hinge bracket moulding having at least one moulded hinge pin engaged by said hinging lugs (21).

Inventors: GILBERT, ROBERT
Applicants: BRITAX RAINSFORDS PTY. LTD.
Application year: 1989
Main classification: B60R1
IPC codes: B60R1