Bicycle head set positioning device

Details Bicycle head set positioning device Bicycle head set positioning device

2001-08-17

2003-02-25

Morris, Lesley D. (Department: 3611)

Land vehicles

Wheeled

Occupant propelled type

C280S280000

Reexamination Certificate

active

06523847

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a head set positioning device for firmly engaging the handlebar stem, the upper head set, the head tube and the lower head set.
BACKGROUND OF THE INVENTION
A conventional bicycle head set is shown in FIG.
6
and generally includes front fork stem
10
extending through the head tube
30
of a bicycle and an upper head set
400
is mounted to a top end of the head tube
30
. A handlebar stem
13
is mounted on the front fork stem
13
and a lower end of the handlebar stem
13
presses on an pressing ring
78
which positions the upper head set
400
in position by a downward force. A disk
75
is located in the handlebar stem
13
and a bolt
74
extends through the disk
75
and a first pushing member
77
threadedly mounted to the bolt
74
. A spring member
70
is mounted to the bolt
74
and supported on cone-shaped surface of the first pushing member
77
. Two spring washers
73
are mounted on the spring member
70
and a second cone-shaped pushing member
710
is mounted on the bolt
74
and engaged with a recessed portion
71
of the spring member
70
. A spring
76
is biased between the disk
75
and the second pushing member
710
. When rotating the bolt
74
, the first pushing member
77
is moved upward to expand the spring member
70
and the handlebar stem
13
is moved downward to push the pressing ring
78
to position the upper head set
400
. However, the conventional way to position the head set
400
requires too many parts and it takes a lot of time to assemble them.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a head set positioning device which comprises a positioning tube movably extending through a crown portion of a front fork and having a rack portion defined in an outer periphery of the positioning tube. A lower head set is fixedly mounted to the positioning tube and a lower end of a head tube is fixedly connected to the lower head set. An upper head set is fixedly connected to an upper end of the head tube and the positioning tube extends through the upper head set. A handlebar stem is mounted to the positioning tube and an extension tube extends from the handlebar stem. A through hole is defined through the handlebar stem. A carry tube is received in the extension tube and located transverse to a longitudinal axis of the extension tube. An aperture is defined through the carry tube and communicates with the through hole. A gear member is rotatably received in the carry tube and engaged with the rack portion in the positioning tube via the aperture and the through hole. A holding member is engaged with the gear member.
The primary object of the present invention is to provide a head set positioning device that employs rack portion and gear member to pull the handlebar stem downward to position the upper head set and the lower head set.


REFERENCES:
patent: 5687616 (1997-11-01), Marui
patent: 5826898 (1998-10-01), Fortier et al.
patent: 5927740 (1999-07-01), Hopey
patent: 6224079 (2001-05-01), Goring

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