Abstract
A control ring (4) provides discrete changes in rotational position to indicate control by a switch assembly (1a) with perceivable haptic response indicating effected changes, wherein a slider (5) is provided with ability to come to an equilibrium position along an axis of rotation (A), wherein the control ring (4) is provided with a number of substantially equiangularly disposed radial protrusions (42a, 42b), wherein the slider (5) is provided with a radial protrusion (52a, 52b) that extends in an area of a circumference defined by the ring's radial protrusions (42a, 42b), wherein the equilibrium position of the slider remains between two adjoining radial protrusions (42a, 42b) of the ring, wherein the radial protrusion (52a) of the slider (5) has a form of a cam (8) having two angularly external surfaces (81, 82) slanted at the same orientation (α.sub.1, α.sub.2) with respect to the plane containing said axis of rotation (A).
Claims
1.-11. (canceled)
12. A rotary switch assembly (1), in particular of a steering wheel column integrated module of an automotive vehicle, comprising a support member (2), a control ring (4) held rotationally by said support member (2), a slider (5) disposed slidably along an axis (A) of rotation of said control ring (4) and cooperating with an activating member (3) to generate electrical signals, wherein an angular displacement of said control ring (4) is converted into an axial displacement of said slider (5), wherein said slider (5) is provided with means (51, 25) for restoring a slider (5) equilibrium position along said axis of rotation (A), said control ring (4) is provided with a number of substantially equiangularly disposed radial protrusions (42a, 42b), said slider (5) is provided with a radial protrusion (52a, 52b) that: extends in an area of a circumference defined by said radial protrusions (42a, 42b) of said control ring (4), remains between two adjoining radial protrusions (42a, 42b) of said control ring (4) when said slider (5) is in the equilibrium position, and cooperates with said radial protrusions (42a, 42b) of said control ring (4), and wherein said radial protrusion (52a) of said slider (5) or said radial protrusions (42b) of said control ring (4) has/have a form of a cam (8) having two angularly external surfaces (81, 82) slanted at a same orientation (α.sub.1, α.sub.2) with respect to said axis of rotation (A) such that an angular displacement of said control ring (4) is converted into an axial displacement of said slider (5).
13. The switch assembly according to claim 12, wherein an angular width (w) of projection of said protrusion (52a, 52b) of said slider (5) on a plane perpendicular to said axis of rotation (A) is lower than an angular width (W) between the adjoining protrusions (42a, 42b) of said control ring (4).
14. The switch assembly according to claim 12, wherein the switch assembly comprises at least one spring plunger (21) disposed substantially in parallel to said axis of rotation (A) and cooperating with an annular haptic surface (41) of said control ring (4) that varies equiangularly along said axis of rotation (A).
15. The switch assembly according to claim 14, wherein said haptic surface (41) is provided with a number of axial projections (411) and recessions (412) in between said axial projections (411), wherein said axial projections (411) axially coincide with said radial protrusions (42a, 42b) of said control ring (4).
16. The switch assembly according to claim 15, wherein said haptic surface (41) varies substantially triangularly along said axis of rotation (A).
17. The switch assembly according to claim 12, wherein said external surfaces (81, 82) of said cam (8) are slanted at a same angle (a) of substantially 45°.
18. The switch assembly according to claim 12, wherein said means (51, 25) for restoring the slider (5) equilibrium position along said axis of rotation (A) comprise at least one spring plunger (51) disposed substantially perpendicularly to said axis of rotation (A) and cooperating with a surface (25) provided with an equilibrium recession (251) in which elastic energy of the plunger (51) is locally minimal.
19. The switch assembly according to claim 12, wherein said slider (5) is guided by said support member (2).
20. The switch assembly according to claim 12, wherein the switch assembly has a form of a column integrated module (1, 6, 7) of an automotive vehicle.
21. The switch assembly according to claim 12, wherein said control ring (4) is available for a user at an entire circumference thereof and has no reference direction.
22. The switch assembly according to claim 12, wherein said radial protrusions (42a, 42b) of said control ring (4) are disposed radially inwardly and said radial protrusion (52a, 52b) of said slider (5) is disposed radially outwardly.
Description
BRIEF DESCRIPTION OF DRAWINGS
[0028] The invention shall be described and explained below in connection with the attached drawings in which:
[0029] FIG. 1 is a schematic perspective, exploded view of an embodiment of a rotary switch assembly according to the present invention in a steering wheel column integrated module;
[0030] FIG. 2 is a schematic perspective, exploded view of an embodiment of a rotary switch assembly;
[0031] FIG. 3 illustrates an embodiment of an electrical connection of the rotary switch assembly;
[0032] FIG. 4 is a schematic perspective, exploded view of the assembled rotary switch shown in FIG. 2;
[0033] FIG. 4a is an enlarged fragment of FIG. 4 showing the cam in relation to the annular haptic surface;
[0034] FIG. 4b is a cross-sectional view of the cam in relation to the cylindrical radial protrusions;
[0035] FIG. 5 is a schematic cross-sectional of another embodiment of the rotary switch assembly according to the present invention;
[0036] FIG. 5a is an enlarged fragment of FIG. 5 showing adjoining actuators with a rhomboidal cross-section in detail, one on either side of a cylindrical rail protrusion;
[0037] FIGS. 6a, 6b, 6c, and 6d are schematic cross-sectional views illustrating functionality of the rotary switch assembly according to the present invention during right-hand rotation; and
[0038] FIGS. 7a, 7b, 7c, and 7d are schematic cross-sectional views illustrating functionality of the rotary switch assembly according to the present invention during left-hand rotation.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
[0039] As shown in FIG. 1, the embodiment of a rotary switch assembly 1a comprises a support member 2, an activating member 3, a control ring 4 and a slider 5. In this embodiment the control ring 4 is disposed rotationally within the support member 2, the activating member 3 has a form of a printed circuit board and is disposed within the support member 2, the slider 5 is disposed slidably, along the axis of rotation of the control ring 4, within the support member 2 and cooperates with the control ring 4 and the activating member 3, as shall be described below, to generate electrical signals. The whole switch assembly 1a is snap-locked to a lever 6 and at the end snap-locked with a cap 7, by means of snap-locking latches 26 and 71, forming a compact, preassembled steering wheel column integrated module of an automotive vehicle (not shown) that may be at the vehicle assembly line mechanically fixed to the steering wheel column and electrically connected to the vehicle wiring not shown in the drawing in a manner well known to those skilled in the art. Turning the control ring 4 may be employed for controlling various components and subsystems of the vehicle such as windscreen wipers frequency, cruise control speed, audio system etc. On the other hand the inclinations of the lever 6 may be employed for turning the wipers or cruise control on and off, etc.
[0040] As shown in FIG. 2 and FIGS. 4, 4a & 4b, the control ring 4 is available to be turned by a user at the entire circumference thereof and may freely rotate over the support member 2 with no particular reference direction or resting position. The control ring 4 has an annular haptic surface 41 that varies triangularly along the axial direction with twelve axial projections 411 and twelve recessions 412 in between them. Haptic surface 41 cooperates with two spring plungers 21 disposed coplanarly with the axis A of rotation of the control ring 4 in two sockets 22 of the support member 2. Each spring plunger 21 comprises an engaging cap 211 encompassing a spring 212 with a spherical tip pressing against the haptic surface 41. Such a construction provides a perceivable haptic response to a user rotating the control ring 4 which will tend to maintain its angular positions in which the engaging caps 211 of the spring plungers 21 remain in the recessions 412, ensuring locally minimum elastic energy of the springs 212. Therefore for N projections 411, user must rotate the control ring 4 against the forces of the springs 212 slightly more than by 7t/N in order to move the engaging caps 211 over the projections 411 and make them contribute to further rotation of the control ring 4 unless the engaging caps 211 settle in the adjoining recessions 412. In the presented embodiment of twelve projections 411, rotation of more than 15° is required and the corresponding angular step of the control ring 4 amounts 30°. Obviously in other embodiments of the haptic surface 41 the number of projections 411 and recessions 412 could be different and the shape of the haptic surface 41 could be obviously sinusoidal, oval or even asymmetrical w/r/t direction of rotation of the ring, providing that the pattern of the haptic surface 41 is substantially equiangular over the perimeter of the control ring 4. Also in other embodiments of the invention a different number of plungers 21 might be employed to improve the haptic response and said control ring 4 might be activated by an additional gearing wheel accessible to the user.
[0041] As shown in FIG. 2 and FIGS. 4, 4a & 4b, the activating member 3 is axially inserted and stabilized in slots 23 of the support member 2. Slider 5 is provided with two guiding rails 55 disposed slidably in slots 24 of the support member 2 located above the slots 23 of the activating member 3. The support member 2 is further provided with two axial self-returning surfaces 25, each having a triangular cross-section in a plane of the slots 24 with an equilibrium recession 251. Each surface 25 cooperates with a spring plunger 51 disposed coplanarly with the slots 24 in a socket 53 of the slider 5, substantially perpendicularly to the axis A. Each spring plunger 51 comprises an engaging cap 511 encompassing a spring 512 (cf. FIG. 1) with a spherical tip pressing against the self-returning surface 25, in order to maintain the equilibrium position of the slider 5 w/r/t the activating member 3. With such a shaping of the surfaces 25, the slider 5 will tend to maintain its equilibrium position in which the engaging caps 511 of the spring plungers 51 remain in the equilibrium recessions 251, ensuring locally minimum elastic energy of the springs 512.
[0042] As shown in FIG. 2 and FIGS. 4, 4a & 4b, the control ring 4 is provided at its internal surface with twelve radial protrusions 42a axially coinciding with projections 411 of the haptic surface 41. The protrusions have substantially cylindrical cross-sections and are provided with circumferential rails 421 at their ends. The slider 5 in turn is provided with a radial protrusion 52a that extends between the two adjoining radial protrusions 42a of the control ring 4 in an area of a circumference defined by the radial protrusions 42a. In this embodiment the radial protrusion 52a of the slider 5 has a form of a cam 8 and the radial protrusions 42a of the control ring 4 have a form of actuators. The cam 8 has a substantially rhomboidal cross-section, in a plane which is parallel to the axis A and tangent to a circumference defined by the radial protrusions 42a (i.e. the plane of cross-sections shown in FIGS. 4b-7d), with rounded edges and two external surfaces 81, 82 at the angular direction slanted with respect to the axial direction respectively and at angles α.sub.1 and α.sub.2 having the same orientation. In this embodiment, angles α.sub.1 and α.sub.2 are substantially the same and amount about 45°. In other embodiments the cam 8 could have an obtuse trapezoid shape with surfaces 81 and 82 slanted at different angles α.sub.1 and α.sub.2 or even curved w/r/t the axial direction.
[0043] The angular width w of projection of the cam 8 on the plane perpendicular to the axis of rotation of the control ring 4 is slightly lower than the angular width W between the adjoining actuators.
[0044] As shown in FIG. 3 in this embodiment the slider has a connecting blade 54 that remains electrically connected with a main conductive path 31 of the activating member 3 regardless of the position of the slider 5. Left turn conductive path 32, neutral conductive path 33, and right turn conductive path 34 adjoin the main conductive path 31 along the direction of the slide of the slider 5, so that in the equilibrium position of the slider 5 the main conductive path 31 and the neutral conductive path 33 remain electrically connected by the connecting blade 54. While the slider 5 deviates from its equilibrium position in either direction, first the connection between paths 31 and 33 breaks and subsequently, after a certain displacement threshold, determined mainly by the shape of the blade 54 and separation between the neutral conductive path 33 and the left turn 32 or right turn 34 conductive path, a new connection between one of these paths 32 or 34 and the main conductive path 31 is established by the connecting blade 54 of the slider 5. In other embodiments of the invention the electrical contact provided by the connecting blade 54 could obviously be replaced by light gate, magnet and hall sensor, etc. In any case rotation of the control element 4 in a particular direction, even if incomplete (cf. FIG. 6b, FIG. 7b), may be used to encode a predefined input transmitted to a given vehicle component controlled by the switch 1.
[0045] The functionality of the switch 1a is illustrated in FIGS. 6 and 7. As shown in FIG. 6a the protrusion 52a (the cam 8) of the slider 5 rests in an equilibrium position between the protrusion 42a.sup.(1) and the protrusion 42a.sup.(2) of the control ring 4. As shown in FIG. 6b, the protrusion 42a.sup.(2) (lower w/r/t the plane of the drawing) of the control ring 4 rotated by a user right (upward) acts on the right turn surface 81 of the cam 8 of the slider 5 forcing the slider to move right. This intermediate position may be detected e.g. by a broken connection between the main conductive path 31 and the neutral conductive path 33 (cf. FIG. 3). Yet in this position the control ring 4, if released, will return to its equilibrium position shown in FIG. 6a. Only after crossing a threshold angular position shown in FIG. 6c will it assume a subsequent equilibrium position between the protrusions 42a.sup.(2) and 42a.sup.(3) shown in FIG. 6d. Achieving this threshold position may obviously be detected e.g. by establishing connection between the main conductive path 31 and the right turn conductive path 34. Left-hand rotation of the switch assembly 1a shown in FIG. 7 is analogous.
[0046] FIG. 5 and FIG. 5b illustrate another embodiment of the rotary switch assembly 1b in which radial protrusions 42b of the control ring 4 have forms of cams 8, while the radial protrusion 52b of the slider 5 is substantially cylindrical. As in the previous embodiment, angles α.sub.1 and α.sub.2 define the ratio between displacement of the radial protrusions 42b of the control ring 4 and displacement of the radial protrusion 52b of the slider 5 that a given radial protrusions 42b acts upon with its right or left turn angularly external surface 81 or 82. In other embodiments both radial protrusions 42 of the control ring 4 and radial protrusion 52 of the slider 5 could have a form of cams.
[0047] The above embodiments of the present invention are therefore merely exemplary. The figures are not necessarily to scale and some features may be exaggerated or minimized. These and other factors however should not be considered as limiting the spirit of the invention, the intended scope of protection of which is indicated in appended claims.
LIST OF REFERENCE NUMERALS
[0048] 1. rotary switch assembly (1a, 1b) [0049] 2. support member [0050] 21. spring plunger [0051] 211. engaging cap [0052] 212. spring [0053] 22. socket [0054] 23. slot (of the activating member) [0055] 24. slot (of the slider) [0056] 25. self-returning surface [0057] 251. equilibrium recession [0058] 26. snap-locking latch [0059] 3. activating member [0060] 31. main conductive path [0061] 32. left turn conductive path [0062] 33. neutral conductive path [0063] 34. right turn conductive path [0064] 4. control ring [0065] 41. annular haptic surface [0066] 411. axial projection [0067] 412. axial recession [0068] 42. radial protrusion (42a, 42b) [0069] 421. circumferential rail [0070] 5. slider [0071] 51. spring plunger [0072] 511. engaging cap [0073] 512. spring [0074] 52. radial protrusion (52a, 52b) [0075] 53. socket [0076] 54. connecting blade [0077] 55. guiding rail [0078] 6. lever [0079] 7. cap [0080] 71. snap-locking latch [0081] 8 cam [0082] 81. right turn angularly external surface [0083] 82. left turn angularly external surface
