Patent GB-1427477-A (GB)
Title: Folding bicycle
IPC: B62M9/02
Filed: 1974-06-03
Abstract: 1427477 Folding bicycles A LASSIERE Ltd 3 June 1974 24472/74 Heading B7E A folding bicycle comprises a main frame formed of hingedly connected front and rear parts 1, 2 so as to be foldable into a folded position, Fig. 3, in which the parts 1, 2 lie sideby-side, a front fork and steering assembly which is rotatable about its longitudinal axis for steering purposes and is hingedly connected to the front frame part 1 so as to be pivotable as a single unit into a folded position in which it lies above the frame part 1, a saddle supporting assembly hingedly connected to the rear frame part 2 so as to be pivotable into a folded position in which it lies above the frame part 2, and locking means operatively associated with each of the hinged connections for maintaining the bicycle in the in use condition of Fig. 1. In the illustrated embodiment the main frame is of box-section, being formed from sheet metal or reinforced plastics, and the parts 1, 2 are connected by a vertical hinge pin 3. The part 1 is provided with lugs 4, 5 receivable in recesses in the part 2 whereby a locking pin 35 can pass through apertures in the part 2 and the lugs to secure the main frame in its in use condition. The saddle supporting assembly comprises a base bracket 32 hinged to brackets 33, 34 on the part 2 such that the assembly can be pivoted down on to the part 2 in the folded condition, a pair of seat tubes 30, 31 extending from the bracket 32, and a pair of tubes 40, 41 attached to a saddle 42 and received in the tubes 30, 31 via locking collars 36, 37 which enable the saddle height to be adjusted. The locking pin 35 can also pass through the bracket 32 to thereby maintain the saddle in the in use condition. A foldable rear stay is hingedly connected at one end to the tubes 30, 31 and at its other end to a bifurcated portion of the rear frame part 2 which mounts the rear wheel 57. The rear stay comprises a pair of rods 43, 44 hinged to a further pair of rods 46, 47, the latter carrying spring loaded sleeves 52, 53 which engage collars 55, 56 on the rods 43, 44 to maintain the stay in its unfolded condition. A housing 9 mounting the front fork and steering assembly is fixed to a bracket 11 which in turn is hinged to a bracket 12 on the front frame part 1 such that the front fork and steering assembly can be pivoted down on to the part 1 in the folded condition. A spring loaded pin (65) (Fig. 4, not shown) in the part 1 engages a recess in the housing 9 to maintain the front fork and steering assembly in the in use condition, the pin being releasable by means of a knob 13. The front fork and steering assembly comprises a front fork 7, mounting the front wheel 8, a tube 6 connected to the fork 7, and handlebars with a stem 14 adjustably received in the tube 6. Gripping parts 21, 22 of the handlebars are pivotally connected to a fixed part 16 to enable the handlebars to be folded as shown in Fig. 3. Spring loaded plungers (71) (Fig. 6, not shown) in the part 16 engage recesses in the ends of the parts 21, 22 to maintain the handlebars in the in use condition, the plungers being releasable by knobs 17, 18. A foldable front stay 25-26 of similar construction to the rear stay is hingedly connected at one end to the tube 6 and at its other end to the frame part 1. The bicycle is driven by pedal cranks each having a lever 59 with a collar 62 on its free end mounting a pedal 63, the collars 62 being rotatable so that the pedal cranks can be folded as shown in Fig. 3. The levers 59 carry spring loaded sleeves 60 with pins which engage in apertures in the collars 62 to maintain the pedal cranks in the folded or unfolded condition. Drive is transmitted from the pedal cranks to the rear wheel by a sprocket 76 and chain 75 drive which incorporates a step-up gear train 78, Fig. 7. The latter comprises a spur gear 79 fixed to a shaft 80 driven by the pedal cranks, a spur gear 87 driven by the gear 79 and mounted on a roller bearing 85 on a fixed shaft 84, and a further spur gear 86 mounted on the bearing 85 to drive a spur gear 82 on a roller bearing 81 on the shaft 80, which bearing 81 also carries the front sprocket 76. The bicycle may alternatively be driven by an engine mounted inside the rear frame part 2 and supplied by a fuel tank housed in the front frame part. A three-speed hub 58 may be provided on the rear wheel.