Bicycle frame construction

Details Bicycle frame construction Bicycle frame construction

1988-03-17

1989-03-21

Bertsch, Richard A.

Land vehicles

Wheeled

Occupant propelled type

2802883, B60J 2500

Patent

active

048136964

ABSTRACT:
A frame for a bicycle has a head tube for housing a steering column, a seat tube surmounted by a saddle and having at its lower end a housing for a pedal crank axle, and two beams extending between the head tube and the seat tube, said beams intersecting one another so that the two beams have X-configuration when viewed in side elevation. Each beam is made from small diameter round rod element, bent to form a `U` shaped hairpin, four of these hairpins being arranged to embrace the outsides of the head tube and the seat tube, two on each, the rod bends being rigidly attached to the tubes they embrace. These hairpins constitute the peripheral tubes of the beams of the `X`-frame as defined at the outset, there being shear webs, in the form comprising zig-zag trusses, attached between the limbs of the hairpins; while at the nodal strong point of the cruciform X-frame, the ends of the `U`-bent rod elements forming each haripin, register and are fixed in holes in a transverse tube constituting a nodal kingpin. Finally, a tie rod extends, beneath the intersecting beams, between lower regions of the head and seat tubes.

REFERENCES:
patent: 4479662 (1984-10-01), Defour et al.
patent: 4540190 (1985-09-01), Moulton
patent: 4541648 (1985-09-01), Tayamiya et al.
patent: 4565383 (1986-01-01), Isaac
patent: 4621827 (1986-11-01), Klein
patent: 4666175 (1987-05-01), Mueller
patent: 4728113 (1988-03-01), Thun, Jr.

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