MOVABLE COVER DEVICE FOR AN AUTOMOBILE LOCK

Abstract: A movable cover device (12) for an automobile lock, comprising a plate (11) supporting the lock operating actuator and fixed to a wall of an automobile compartment, and a cover (12) pivoted on the plate, the device having in the cover an area substantially equal to that of the plate and is provided with a pivot (13) substantially orthogonal to its wall and rotatably supported by a bush (15) which is rigid with the plate and is also orthogonal to its wall, so that the walls of the plate (11) and of the cover (12) are in contact, at least when they are completely superposed.

Description: This invention relates to a movable cover device for an automobile lock, and particularly for the actuator for the lock of a compartment lid, such as the luggage compartment or boot lid. In automobiles, the actuator for opening and closing a lock, such as the boot lock, can be operated either directly by means of a key, or from the interior of the passenger compartment by means of remote controls consisting of electrical pushbuttons or levers, and suitable transmissions. Operating the lock by means of a key is more immediate and therefore more comfortable for the user. Remote control systems offer greater security against tampering, and are more effective from an aesthetic viewpoint because they have no visible parts. Devices have been developed for masking the lock actuator opening when not in use, and these comprise a cover which is pivotable away from a lock-masking position into a position permitting access to the lock when required. A device of this type and having the features of the preamble of claim 1 is disclosed in US-A-3930391. In this device the elastic means take the form of a torsion spring arranged around the pin of the cover and secured at one end to the cover pin and at the other end to the plate. When the cover has been manually rotated into the open position, a spring detent projects into a cover-retaining position, so holding the cover in open position and allowing operation of the lock. The rotation of the key in the lock then depresses the spring detent, permitting the disengagement of the cover and its return to the masking position once the lock has been operated and the key withdrawn. This however causes the cover to strike on the key during rotation and withdrawal of the latter, deteriorating both the key and the cover over a period of time and hindering withdrawal of the key. Furthermore, in order to ensure the correct cover return movement under the action of the torsion spring, a certain play must exist between the cover and the plate, and this does not allow to achieve a reliable covering action capable of preventing dust, water etc. from penetrating between the cover and the plate. The purpose of the present invention is that of providing a movable cover device which, while effectively masking the lock actuator in the closed position, does not have the above drawbacks of the known device. This purpose is achieved by a device having the features claimed in claim 1. Characteristics and advantages of the invention are illustrated hereinafter with reference to the accompanying Figures 1 to 4, which show a preferred embodiment of the invention by way of non-limiting example. Figure 1 is an exploded perspective view of a cover device according to the invention; Figure 2 is a front view of said device; Figure 3 is a section on the line III-III of Figure 2 with the device in its closed position; and Figure 4 is a section through a detail on the line IV-IV of Figure 2. In Figure 1 the cover device, indicated overall by 10, is shown partly dismantled and consists of a disc-shaped plate 11 and a disc-shaped cover 12, these therefore being of substantially equal shape and area. An excentrical pivot pin 13 and a peg 14 are rigid with the cover 12, and both project orthogonal to its major wall. In the plate 11 there is formed a bush portion 15 in which the pivot pin 13 is rotatably supported. As shown in Figure 3, between the pivot pin 13 and bush portion 15 there are interposed an O-ring 16, which rests against a shoulder 17 of said pivot pin, and a spring 18 which rests on a stop shoulder 36 of the bush portion 15 and is retained axially by a washer 19 secured by a snap ring 20 to the free end of the pivot pin 13. A recessed compartment or seat 21 is provided in the plate 11 to house a load-reversing wire spring indicated by 22. One end 23 of the spring 22 is pivotally constrained to the plate 11 at a hole 24 thereof, and the other end 25 of said spring 22 is pivotally constrained to the cover 12 at a hole 26 thereof, which is shown by dashed and dotted lines in Figures 1 and 2. During operation with the device assembled, the end 25 of the spring 22 is inserted in the hole 26, but for ease of representation it is shown in Figure 1 extracted from the hole 26 and resting against the wall of the compartment 21. In the plate 11 there is also provided an arcuate guide track indicated by 27, which is concentric with the bush portion 15 and acts, during the relative rotation between the cover 12 and plate 11, as a guide and limit stop for the peg 14 which is slidingly inserted in it. A shown in Figure 4, the track 27 has a profiled bottom formed ― in the direction of opening of the cover 12 ― from a depressed portion 37 situated at a depth equal to the length of the peg 14, a raising ramp portion 38, and a raised portion 39 situated at a depth less than the length of said peg 14. With this arrangement and thanks to the axially acting spring 18, the plate 11 and cover 12 are in contact when they are completely superposed, so efficaciously masking the lock actuator opening, whereas they remain slightly separated from each other during relative rotation, and therefore do not slide against each other. Finally, said plate 11 also comprises an opening 28 in which is mounted the actuator, not shown, for operating the lock of a compartement lid (partly shown by wall 29). The actuator is preferably operated by a key, also not shown. Using ring nuts 31 and 32, the plate 11 is fixed, after interposing a rubber gasket 30 visible in Figure 3, to the sheet metal of the lid wall 29, for example of the luggage compartment or boot, in a portion 40 thereof which is slightly depressed and recessed, but which nevertheless allows the cover 12 to be easily and completely opened. The ring nuts 31 and 32 comprise radial recesses, not shown, which enable them to be mounted on the bush 15 and on a bush 33 provided at the seat 28, by passing over corresponding radial projections provided on the outside of said bushes, such as that indicated by 34 and visible in Figure 3. After rotation, the ring nuts 31 and 32 remain held between the sheet metal wall 29 and said projections on the bushes 15 and 33. In this particular case, the cover 12 incorporates the trademark emblem, indicated by 35, but it could obviously be painted the same colour as the sheet metal body. In either case, when the cover 12 is in its closing position covering the plate 11, it hides the lock actuator so providing considerable camouflage which is also aesthetically valid. The spring 22 exerts an action on the cover 12, which keeps it either in its closed position or in its open position as a function of the angular position of the cover 12 relative to the plate 11. To operate the lock, the cover 12 is raised by rotating it anticlockwise through a path corresponding to an angle of about 90°, so as to completely uncover the opening 28 for the actuator of the lock for the lid, as shown in Figure 2. In rotating the cover 12, during the first part of its path the return action of the spring 22 has to be overcome, whereas after passing beyond the load reversing position or dead point, in which the ends 23 and 25 of the spring 22 are coplanar with the axis of the pivot 13, said spring exerts on the cover 12 an action in the opening direction, which keeps it raised and stably positioned in its end-of-travel position shown in Figure 2, independently of any detent and without interfering with the key.

Claims: 1. A movable cover device (10) for an automobile lock, comprising a plate (11) fixable to a wall (29) of an automobile compartment and having an opening (28) for receiving a lock operating actuator, and a cover (12) having a substantially equal shape and area as the plate (11) and being excentrically pivoted to the plate (11) by a pivot pin (13) projecting substantially orthogonally from the cover (12) and being rotatably supported in a bush portion (15) of the plate (11) extending substantially orthogonally to the plate (11), whereby the cover (12) is pivotable between a closing position in which it is juxtaposed to the plate (11) and conceals said opening (28) and an open position in which it uncovers said opening (28), and elastic means (18, 22) arranged for normally holding the cover (12) in said closing position, characterized in that an arcuate guide track (27) is provided in the plate (11) concentrically with said bush portion (15) and is slidingly engaged by a peg (14) rigidly projecting from the cover (12), said guide track (27) having a profiled bottom which in the direction of opening of said cover (12) has a depressed portion (37) lying at a depth corresponding to the length of said peg (14), a raising ramp portion (38), and a raised portion (39) lying at a depth less than the length of the peg (14), and in that said elastic means comprise a first spring (18) urging said pivot pin (13) axially inside said bush portion (15) in a direction causing said peg (14) to engage said profiled bottom, and a load-reversing wire spring (22) housed in a seat (21) of the plate (11) and having ends (23, 25) respectively constrained to the plate (11) and the cover (12) at positions such that the cover (12) is urged in said closing or said open position as a function of the angular position thereof relative to the plate (11). 2. A movable cover device as claimed in claim 1, characterized in that said first spring (18) is arranged between a stop shoulder (36) of said bush portion (15) and a washer (19) secured by a snap ring (20) to the free end of said pivot pin (13). 3. A movable cover device as claimed in claim 1, characterized in that said plate (11) and said cover (12) are disc-shaped.

Inventors: BIAZZI, GIUSEPPE, VILLA, EZIO
Applicants: ALFA LANCIA S.P.A.
Application year: 1988
Main classification: E05B17
IPC codes: E05B17