Patent ID: 6668605
Filing Date: 2003-12-30
Classification: B62H,Y10T

Abstract:
An anti-theft device for bicycles comprising one or more frame tubes (1) and a pedal crankshaft guide (2) attached thereto, whereby a right-hand and a left-hand bearing receptacle (3) with antifriction bearings (4) are arranged in the pedal crankshaft guide (2) on each of the two sides, in which a pedal crankshaft (5) is supported in a rotating manner; whereby a chain sprocket wheel (6) with a pedal crank (7) is arranged on the one end of the pedal crankshaft (5), and a pedal crank (7) is arranged on the other end of the pedal crankshaft (5), said pedal cranks each being screwed to the pedal crankshaft (5) on both sides by means of a fixing screw (8), characterized in that central through-extending bores (9) are arranged both axially in the pedal crankshaft (5) and axially also in the fixing screws (8), and the pedal crankshaft (5), the latter being dimensioned with a greater diameter in the mid-region (10) and provided in said region with a radial recess (11), in which both a lock housing (12) with a cylinder lock (13) and also a slider (17) are arranged; whereby a key (14) of the cylinder lock (13) axially penetrates the fixing screw (8) located closest to the cylinder lock, and an eccentric pin (16) is arranged on the opposite face side of the cylinder lock (13), said eccentric pin being actively connected via a eccentric pin guide (18) in a face side with the slider (17) displaceably arranged in the recess (11); and whereby a locking groove (19) provided with a central bore (21) is arranged in the face side disposed opposite the eccentric pin guide (18), with a locking head (23) of a lock pin (22) of a locking system projecting into said groove, said lock pin being insertable through the through-extending bore (9) of the opposite, second fixing screw (8), and the recess (11) in the pedal shaft (5).