Land vehicles – Wheeled – Running gear
Patent
1990-02-06
1991-02-12
Rice, Kenneth R.
Land vehicles
Wheeled
Running gear
74492, B62D 118
Patent
active
049918710
ABSTRACT:
A collapsible steering column apparatus comprises a steering shaft in which a steering wheel is fixed to one end and a whole length in the axial direction can be contracted and a steering column in which a whole length in the axial direction can be contracted by inserting the edge portion of an inner column to the inside of the edge portion of an outer column. A first engaging portion is formed near the edge portion of the outer column. The first engaging portion comprises a pair of first arc portions which face each other and are respectively come into contact with the outer peripheral surface of the edge portion of the inner column and a pair of second arc portions which are arranged between the pair of first arc portions and are away from the outer peripheral surface of the edge portion of the inner column by having a radius of curvature which is smaller than a radius of curvature of the outer peripheral surface of the edge portion of the inner column. A second engaging portion is formed in the portion which is slightly near the center of the outer column than the first engaging portion. The second engaging portion comprises a pair of third arc portions which face each other and are respectively come into contact with the outer peripheral surface of the edge portion of the inner column and a pair of fourth arc portions which are arranged between the pair of third arc portions and are away from the outer peripheral surface of the edge portion of the inner column by having a radius of curvature which is smaller than the radius of curvature of the outer peripheral surface of the edge portion of the inner column. A length of the pair of third arc portions is set to be longer than a length of the pair of first arc portions.
REFERENCES:
patent: 3392599 (1968-07-01), White
patent: 3470761 (1969-10-01), Okamoto et al.
patent: 4445708 (1984-05-01), Oakes et al.
patent: 4674354 (1987-06-01), Brand
Nippon Seiko Kabushiki Kaisha
Rice Kenneth R.
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