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A folding convertible top for a convertible vehicle includes a rotational angle detection device disposed in a rotary hinge (1) for detection of the rotational angle between linkage arms (2, 4) of a convertible top frame that are pivotably connected with each other by a bearing pin (10; 22). A rotat

A folding convertible top for a convertible vehicle includes a rotational angle detection device disposed in a rotary hinge (1) for detection of the rotational angle between linkage arms (2, 4) of a convertible top frame that are pivotably connected with each other by a bearing pin (10; 22). A rotational angle encoder (8; 18; 30) is connected with one linkage arm so as to rotate therewith and a sensor element (6; 20; 32) is connected with the other linkage arm so as to rotate therewith. The rotational angle encoder and/or the sensor element is/are disposed adjacent to the bearing pin on respective surfaces of the linkage arms facing towards each other or within housing parts (24, 26) connected to the respective linkage arms.

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The invention claimed is: 1. A foldable frame for supporting a convertible top, comprising: at least first and second linkage arms pivotably coupled at a rotary hinge defining a rotational axis of the first and second linkage arms, a rotational angle encoder fixedly coupled with the first linkage a

The invention claimed is: 1. A foldable frame for supporting a convertible top, comprising: at least first and second linkage arms pivotably coupled at a rotary hinge defining a rotational axis of the first and second linkage arms, a rotational angle encoder fixedly coupled with the first linkage arm adjacent to the rotational axis, the rotational angle encoder being disposed on an inner-facing surface of, or within, at least one of the rotary hinge and the first linkage arm and a sensor element fixedly coupled with the second linkage arm adjacent to the rotational axis, the sensor element being disposed on an inner-facing surface of, or within, at least one of the rotary hinge and the second linkage arm, wherein the rotational angle encoder and the sensor element are arranged and constructed to generate a signal representative of the angular position of the first linkage arm relative to the second linkage arm. 2. The foldable frame according to claim 1, wherein at least one of the rotational angle encoder and the sensor element is accommodated in a recess defined in at least one of the surfaces of the linkage arms and the rotary hinge that face towards each other. 3. The foldable frame according to claim 1, further comprising: a bearing bush extending through at least one of the first and second linkage arms and surrounding a bearing pin defining the rotational axis of the rotary hinge, the bearing pin having a shaft length corresponding at least to the thickness of at least one linkage arm that surrounds the bearing pin. 4. The foldable frame according to claim 1, wherein the linkage arms are pivotably connected to each other by one of a rivet, a screw and a bolt. 5. The foldable frame according to claim 1, wherein the rotational angle encoder contacts the sensor element. 6. The foldable frame according to claim 1, wherein the rotational angle encoder is arranged and constructed not to contact the sensor element during detection of the rotational angle. 7. The foldable frame according to claim 1, wherein the sensor element is accommodated within a housing part attached to an end portion of one of the first and second linkage arms, which housing part at least partially defines the rotary hinge. 8. The foldable frame according to claim 1, wherein the sensor element comprises a film potentiometer and the rotational angle encoder comprises a mounted pin in contact with the film potentiometer. 9. The foldable frame according to claim 1, wherein the rotational angle encoder comprises a magnet and the sensor element is an inductive sensor element. 10. The foldable frame according to claim 1, wherein the rotational angle encoder comprises a magnet and the sensor element is a Hall element. 11. The foldable frame according to claim 10, wherein the Hall element is accommodated within a housing part attached to an end portion of one of the first and second linkage arms, the housing part at least partially defining the rotary hinge. 12. The foldable frame according to claim 11, further comprising: a bearing bush extending through at least one of the first and second linkage arms and surrounding a bearing pin defining the rotational axis of the rotary hinge, the bearing pin having a shaft length corresponding at least to the thickness of at least one linkage arm that surrounds the bearing pin. 13. The foldable frame according to claim 3, further comprising a spacer washer disposed between the first and second linkage arms, the spacer washer having a thickness that is at least as thick as the height required by at least one of the rotational angle encoder and the sensor element disposed between the two facing surfaces of the linkage arms. 14. A convertible top for a convertible vehicle, comprising: the foldable frame according to claim 12, and a foldable top supported by the foldable frame. 15. A convertible top for a convertible vehicle, comprising: the foldable frame according to claim 1, and a foldable top supported by the foldable frame.