This clamping device includes a clamping collar intended to surround an element to be clamped and open so as to have two ends able to come closer to one another in order to grip the element to be clamped. This device also includes a lever, mounted tilting on the ends of the collar around a tilting axis perpendicular to a central axis of the collar, and connected to the collar by a cam system able to be actuated by tilting the lever. The cam system includes at least one pair associating a cam surface and a counter-cam surface, which are each globally helical and which are respectively connected in rotation to the collar and the lever. The cam surface of each pair includes a first surface portion, against which the counter-cam surface is pressed when the lever is in an open position and is tilted from the open position to a closed position, and a second surface portion, which is connected to the first portion and against which the counter-cam surface is pressed when the lever is in the closed position and tilted from the closed position toward the open position. The counter-cam surface includes a main part, which is helical, while being centered on the tilting axis and having a constant pitch, and which is pressed along the tilting axis against the second surface portion of the associated cam surface when the lever is in the closed position. Furthermore, the cam surface defines a bearing helix at which the bearing stresses are applied between the cam and counter-cam surfaces, this bearing helix winding around the tilting axis and extending at least partially over the first and second portions. In order to improve this clamping device, in particular for its use on rental cycles, the bearing helix of the cam surface has a helix angle that is larger on the first portion than on the second portion of the cam surface, while this second portion of the cam surface has a pitch that is substantially equal to the constant pitch of the main part of the associated counter-cam surface.
DISPOSITIF DE SERRAGE, NOTAMMENT DE SERRAGE D'UNE SELLE POUR UN CYCLE
A CLAMPING DEVICE, IN PARTICULAR FOR CLAMPING A SADDLE FOR A CYCLE
SPANNVORRICHTUNG, INSBESONDERE ZUM FESTZIEHEN EINES SATTELS AUF EINEM FAHRRAD
2020-07-08
Patent
Elektronische Ressource
Französisch
IPC: | B60B VEHICLE WHEELS , Räder für Fahrzeuge / B62K Fahrräder , CYCLES / F16B DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES , Vorrichtungen zum Befestigen oder Sichern von Konstruktionselementen oder Maschinenteilen, z.B. Nägel, Bolzen, Schrauben, Sprengringe, Klemmen, Klammern oder Keile |
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