BREAKAWAY MIRROR RETENTION MEANS

Abstract: Retention means for retaining the pivoted portion (20) of a "break-away" rear vision mirror to the mounting base portion (11). A control lever (12) is ball mounted for universal pivoted movement in the mounting base portion, and has a lever arm (33) which extends into the pivoted portion, the lever arm terminating in a 'T' head (32) which is freely movable in a channel (29) on the mirror back, but retained in the channel by the channel walls (31), some of which have retaining nibs (30) at one end. A spring (17) draws the two portions back together after "break-away", and the channel is guided in this movement, partly by the lever arm 'T' head, to assist in correct repositioning of the pivoted portion.

Description: This invention relates to retention means for retaining and repositioning the portions of a rear vision mirror assembly of the so-called "break-away" type, wherein a mounting base portion is secured to an outer panel of a vehicle and a pivoted portion of a rear vision mirror assembly extends outwardly therefrom, the pivoted portion however being deflectable so as to reduce danger of personal harm in the event of accident. BACKGROUND OF THE INVENTION One of the problems which has been encountered heretofore is that although retention means have interconnected the pivoted portion to the mounting base portion, the repositioning of the pivoted portion with respect to the mounting base portion has been difficult to achieve and in some instances drivers have assumed the mirror has been destroyed, and have continued to drive vehicles without proper rear vision facilities. The main object of this invention is to provide improved retention means which will both retain and automatically reposition the pivoted portion of a rear vision mirror after it has been deflected away from its mounting base portion. BRIEF SUMMARY OF THE INVENTION In the invention, there is provided retention means for retaining the pivoted portion of a "break-away" rear vision mirror to the mounting base portion. A control lever is ball mounted for universal pivoted movement in the mounting base portion, and has a lever arm which extends into the pivoted portion, the lever arm terminating in a 'T' head which is freely movable in a channel on the mirror back, but retained in the channel by the channel walls, some of which have retaining nibs at one end. A spring draws the two portions back together after "break-away", and the channel is guided in this movement, partly by the lever arm 'T' head, to assist in correct repositioning of the pivoted portion. More specifically, the invention consists of retention means between a mounting base portion and a pivoted portion of a rear vision mirror assembly of the "break-away" type, wherein pivot means between the portions comprise projecting lugs on one portion which releasably engage socket portions of the other portion, the pivoted portion comprising a cover, a mirror backing plate, universal pivot means between the cover and backing plate, a mirror on the backing plate, a narrow mouth channel defined by channel walls on the backing plate which extend towards the base portion, some of said walls having inturned retaining portions adjacent their ends, the base portion comprising a socket wall, a control lever having a lever arm extending through the socket wall and carrying a ball intermediate its ends which bears against said socket wall, a 'T'-head on an end of said lever arm freely movable in said narrow mouth channel but retained therein by said channel walls and retaining portions, and a spring extending between said portions urging said projecting lugs into engagement with said socket portions. Even with this arrangement, there is sometimes a possibility of dislodgement and in an embodiment of the invention, a support plate has the spring extending around it, the spring ends being coupled to a saddle carried by the control lever, the spring being guided for its movement such that the spring tends to urge the mirror assembly into the correct position. BRIEF DESCRIPTION OF THE DRAWINGS An embodiment of the invention is described hereunder in detail with reference to and is illustrated in the accompanying drawings in which: Fig. 1 is a diagrammatic elevation showing portion of a "break-away" rear vision mirror assembly (the mirror and its backing plate being absent); Fig. 2 is a section taken on line 2-2 of Fig. l; Fig. 3 is a fragmentary view similar to Fig. l, showing the pivoted portion deflected upwardly; Fig. 4 is a fragmentary view similar to Fig. 2 but showing the pivoted portion deflected rearwardly; and Fig. 5 is a section taken on line 5-5 of Fig. 4 but drawn to a larger scale. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT In this embodiment a "break-away" rear vision mirror assembly comprises a mounting base portion 11 which is arranged to be secured to an external panel of a vehicle, and has projecting inwardly therefrom a control lever 12, the control lever 12 having a ball 13 which is urged into engagement with a wall of a socket 14 by means of a saddle 15 which has two hook ends 16 coupled to respective ends of a U-shaped spring 17 which is carried and guided by arcuate spring track walls in a spring plate 18 secured to a cover 19 of a pivoted portion 20 of mirror assembly 10. The spring track walls guide the spring for only its curved portion, as shown in Fig. l, so that, on "break-away", the ends of the spring can change position. The pivoted portion 20 comprises a support plate 24 also secured to the cover 19 and having a universal mounting ball 25 on which is mounted a mirror backing plate 26 for universal pivotal movement, the backing plate 26 supporting a mirror 27. The mirror backing plate 26 however is monolithic with a guide for the control lever, which comprises channel walls 29 (not shown in Fig. 1) which terminate at their mounting base ends in inturned nibs 30. The walls 29 have flanges 31 extending along their outer edges, so that the channel is narrow-mouthed, and the flanges 31 and inturned nibs 30 prevent withdrawal of a 'T'-head 32 on inner end of arm 33 of the control lever 12. (The ball 13 is an arm 33.) This will positively retain the pivoted portion 20 of the mirror assembly to the control lever 12 under all conditions of deflection other than severe impact or disintegration of the assembly. The mounting base portion 11 is provided with four outwardly projecting V-shaped locating lugs 36 (not shown in Fig. 2) and these enter corresponding sockets 37 at the mounting end of the pivoted portion 20, the sockets 37 being in the cover walls. The pivoted portion 20 is retained in its normal position by means of the 'U'-shaped spring 17 which extends through the adjacent walls of the mounting base 11 and cover 19, and engage the saddle 15, which can (in some instances) be a length of thick wire. However, in this embodiment, as more particularly shown in Fig. l, the saddle 15 has legs 39 which extend through large apertures in the mounting base portion 11 so that they can tilt, and because the spring 17 is tensioned upon deflection, the mirror assembly is guided back to its correct position so that the locating lugs 36 re-enter the sockets 37. The spring 17, the 'T'-head 32 and channel walls 29, and the legs 39, all perform part of the guide function. Although the invention will be seen to be very simple it nevertheless results in an effective repositioning of the mirror assembly under a much wider range of conditions than exists with prior art mirror assemblies.

Claims: 1. Retention means between a mounting base portion and a pivoted portion of a rear vision mirror assembly of the "break-away" type, wherein pivot means between the portions comprise projecting lugs on one portion which releasably engage socket portions of the other portion, the pivoted portion comprising a cover, a mirror backing plate, universal pivot means between the cover and backing plate, a mirror on the backing plate, a control lever guide on the backing plate which extends towards the base portion, said guide having retaining portions adjacent its end, the base portion comprising a socket wall, a control lever having a lever arm extending through the socket wall and carrying a ball intermediate its ends which bears against said socket wall, a head on an end of said lever arm freely movable in said guide but retained therein by walls thereof and said retaining portions, and a spring extending between said portions urging said projecting lugs into engagement with said socket portions. 2. Retention means according to claim 1 wherein said control lever guide comprises a plurality of channel walls which define a narrow mouth channel, and said retaining portions comprise inturned nibs on respective ends of some of said walls. 3. Retention means according to claim 2 wherein said head is a 'T'-head freely movable within said channel. 4. Retention means according to claim 3 wherein said lever arm ball carries a transversely extending saddle, and said spring is a 'U'-shaped spring, a spring engaging surface on said pivoted portion engaging and guiding an intermediate part of said spring, and ends of said spring being coupled to ends of said saddle. 5. Retention means according to claim 4 wherein said saddle is 'U'-shaped, having legs guided for movement in said mounting base portion, said spring being coupled to the ends of said legs. 6. Retention means according to claim 5 wherein guidance of the pivoted portion after breakaway is effected partly by each of said T-head, said channel walls, said spring and said saddle walls.

Inventors: FIMERI GARRY GORDON LESLIE
Applicants: BRITAX RAINSFORDS PTY. LTD.
Application year: 1988
Main classification: B60R1
IPC codes: B60R1