Hydraulic actuating device for brakes and gearshifts of bicycles or the like
AssigneeFichtel & Sachs AG
InventorsJoachim Gajek, Hannsjorg Stumpf
Life of this patent
Estimating the term…
Abstract
A hydraulic actuating device for brakes and gearshifts on bicycles or the like comprises an actuating lever (1b), a transmitting cylinder (1a), a flexible pressure line (9) and a receiving cylinder (1). The receiving cylinder (1) is connected with a first component (A) of a device to be actuated, and the piston (20) in the receiving cylinder (1) is mechanically connected with a second component (B) of the device by a traction cable (25).
Claims21
A hydraulic actuating device for brakes and gearshifts on bicycles, comprising an actuating lever, a transmitting cylinder coupled to the actuating lever, a receiving cylinder for converting the displacement of the transmitting cylinder by the actuation of the actuating lever into displacement of the receiving cylinder in accordance with the ratio of the areas of the transmitting cylinder and the receiving cylinder, and a flexible pressure line communicating the transmitting cylinder and the receiving cylinder, wherein the receiving cylinder includes a cylinder housing part and a piston;
- the cylinder housing part being directly connected with a first fastening section of a first component of a device to be actuated by a connecting extension and being stationary with respect to the first component upon actuation of the actuating lever, and the piston being mechanically connected by a traction element with a second fastening section of a second component of the device which is movable in relation to the first component for generating a pulling force between the first and second fastening portions in order to reduce the distance between the first and second portions upon actuation of the actuating lever.
A piston-cylinder unit for a pressure fluid actuating device of two-wheeled vehicles for delivering a fluid under pressure by means of a relative movement between two manually operated components, or for receiving a fluid and the mechanical operation of two components which are to be moved relative to one another, comprising a cylinder housing part with a cylinder chamber having an axis, the cylinder chamber being closed on one of its axial ends by a cylinder bottom, a piston axially displaceable in the cylinder chamber, a pressure chamber formed between a front face of the piston facing the cylinder bottom and the cylinder bottom, and a hydraulic pressure line communicating with the pressure chamber for the supply of working fluid into the pressure chamber and for the removal of the working fluid from the pressure chamber, wherein the cylinder housing part is connected with a first one of the two components and the piston is connected with a second one of the two components, wherein the piston has an interior recess parallel to the cylinder axis and open toward the cylinder bottom which is closed by a piston bottom of the piston at an end of the interior recess facing away from the cylinder bottom, a guide element which is parallel to the cylinder axis and has a guide section projecting beyond the cylinder bottom and extending into the interior recess and disposed on the cylinder bottom, the dimension of the guide section parallel to the cylinder axis being greater than a maximum stroke of the piston in the cylinder chamber, a guide element hole extending through the guide element and a cylinder bottom hole extending through the cylinder bottom, the guide element hole and cylinder bottom hole being in alignment with one another and receiving a traction element that is connected between the piston and the second component.
Dependencies are inferred from the claim text.