A SWITCH STALK FOR A STEERING COLUMN

Abstract: A switch stalk comprises a stalk body (1) in the form of a hollow tube having a free end section (3) of enlarged diameter housing a connector spigot (12) of a knob (10) a main body portion (11) of which is rotatable about an axis extending longitudinally of the end section (3). The connector spigot (12) has a socket (23) receiving a connector pin (22) at one end of a flexible sheathed cable (20) the other end of which has a similar pin (25) housed in a socket (26) of a switch-actuating pin (27). The inclined end section (3) of the switch stalk allows the knob (10) to be operated easily by the driver's fingers without removing his hand from the steering wheel.

Description: "A switch stalk for a steering column" The present invention relates to a switch stalk which can be fitted to the steering column of a motor vehicle closely adjacent the steering wheel. At present most motor vehicles are provided with electrical switches for controlling important vehicle functions such as headlights, windscreen wipers, direction indicators etcetera close to the steering wheel on switch stalks or levers which extend radially from the steering column close to the steering wheel. One such known switch stalk has an actuating knob which is rotatable for the different actions about an axis substantially coincident with the axis of the stalk. This known switch stalk, however, extends merely in a straight line from the steering column, and, in some cases, difficulties are encountered in seeking to operate the switch in that the control knob is not always in the most suitable position for easy actuation. Although ideally the driver should not have to take his hands off the steering wheel whilst driving it is a disadvantage of the known structure that in fact, in many cases, the user has to remove his hand from the steering wheel for a short time in order to operate the switch, and this can be inconvenient if the actuating knob is not directly and easily accessible to the driver's fingers. The object of the present invention is that of providing a switch lever structure which can be fitted close to the steering wheel of a motor vehicle, which has an ergonomic shape which is particularly advantageous, and which allows the actuating knob to be disposed at a point which is immediately accessible to the driver's fingers. According to the present invention there is provided a switch stalk structure adapted to be fitted to a steering column adjacent the steering wheel of a motor vehicle, characterised in that it comprises a stalk body which when fitted to a steering column extends substantially radially of the steering wheel, the stalk body having a free end section inclined towards the steering wheel and carrying an actuating knob rotatably thereon, the said knob being operatively connected to a flexible cable extending axially within the said stalk body and connected at its other end to a switchactuating pin rotatably mounted on the said steering column. A particular advantage of the invention is that it provides a switch stalk structure in which it is possible for the actuating knob to be disposed with an axis of rotation which greatly facilitates its utilisation; in fact the knob itself can be positioned with an inclination which can be reached instinctively by the hand of the driver. Another avantage of the present invention is that it provides a switch lever structure which can be fitted to the steering column of a motor vehicle and which, because of its structural characteristics, is able to offer the widest guarantees of reliability and safety in use. One embodiment of the present invention will now be more particularly described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a longitudinal section through a switch stalk structure according to the invention; Figure 2 is a cross section taken on the line II-II of Figure 1; Figure 3 is a cross section taken on the line Ill-Ill of Figure 1; and Figure 4 is a cross section taken on the line IV-IV of Figure 1. Referring now to the drawings, a switch stalk for a motor vehicle comprises a stalk body 1 formed by a tubular section of plastics material which can be fitted at one end to the steering colum casing, generally indicated with the reference numeral 2, of a motor vehicle. At its free end the stalk body 1 has a free end section 3 which is inclined towards the steering wheel of the motor vehicle. The free end section 3 has a substantialy cylindrical cup-shape conformation and is provided, over a part of its side surface, with a viewing window indicated 4. An actuating knob 10 is rotatably connected to the free end section 3. The actuating knob 10 has a knob body 11, lying outside the stalk body 1 in continuation of the free end section 3 thereof, and an inner spigot 12 which is rotatably housed within the free section 3 and which is provided, on its surface with appropriate ideograms or other graphic indications, which can be viewed through the viewing window 4 to indicate the switching function corresponding to the selected position of the knob 10. The inner spigot 12, as is illustrated in Figure 4, has stop tongues 13 for defining the end positions to which the knob 10 can be moved by rotation about an axis parallel to that of the adjacent part of the stalk body 1. A flexible Bowden cable 20 is connected to the said actuating knob 20, which cable extends within the stalk body 1 and is housed in a sheath or spiral containment tube 21. At its free end the flexible cable 20 has a first shaped pin 22 which engages in a first socket 23, moulded within the actuating knob spigot 12, whilst at the other end it has a second shaped pin 25. This latter engages in a socket 26 which is connected to a pin 27 which is rotatably fitted to the steering column of the steering wheel. The flexible Bowden cable 20 therefore allows the rotation applied to the actuating knob 10 to be transmitted in a simple way even though the knob 10 itself is disposed at an angle to the length of the main part of the body of the stalk, because the flexible cable gives the possibility of transmitting the rotation along the axis of the lever even though this latter has a terminal inclined section. The presence of a connection between the pin and the actuating knob formed by means of the flexible Bowden cable allows obstruction of the mechanism due to twisting or the like to be eliminated.

Claims: Claims: 1. A switch stalk structure adapted to be fitted to a steering column adjacent the steering wheel of a motor vehicle, characterised in that it comprises a stalk body (1) which when fitted to a steering column (2) extends substantially radially of the steering wheel, the stalk body (1) having a free end section (3) inclined towards the steering wheel and carrying an actuating knob (10) rotatably thereon, the said knob (10) being operatively connected to a flexible cable (20) extending axially within the said stalk body (1) and connected at its other end to a switch-actuating pin (27) rotatably mounted on the said steering column (2). .2. A switch stalk structure according to Claim 1, characterised in that the said free end section (3) of the stalk body (1) has a substantially cylindrical cup-shape conformation with a viewing window (4) in its side wall, the said actuating knob (10) having an inner spigot portion (12) extending within the said free end section (3) of the stalk body (1) and having on its surface ideograms or the like which can be viewed through the said window (4) to indicate the functional position of the said knob (10). 3. A switch stalk structure according to Claim 1 or Claim 2 characterised in that the said flexible cable (2) extending through the stalk body (1) is housed within a tubular sheath (21). 4. A switch stalk structure according to any preceding Claim, characterised in that the said inner spigot portion (12) of the said actuating knob (10) is provided with stop tongues (13) for defining different operating positions of the actuating knob (10) with respect to the stalk body (1). 5. A switch stalk structure according to any preceding claim, characterised in that the said flexible cable (20) has at one end a first shaped pin (22) engageable in a socket (23) moulded in the inner spigot (12) of the knob (10) and, at the other end a second shaped pin (25) engageable in a socket (26) rigidly connected to a switch-actuating pin (27) mounted on the steering columb (2).

Inventors: CODRINO, GIUSEPPE
Applicants: CAVIS CAVETTI ISOLATI S.P.A.
Application year: 1987
Main classification: B60Q1
IPC codes: B60Q1