Machine element or mechanism – Control lever and linkage systems – Elements
Reexamination Certificate
1999-04-21
2001-02-27
Herrmann, Allan D. (Department: 3682)
Machine element or mechanism
Control lever and linkage systems
Elements
C280S279000, C403S101000, C403S110000
Reexamination Certificate
active
06192773
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an improved stem, and more particularly, to an improved stem for a bicycle which provides easy and convenient angle adjustment of the stem and the handlebar at the same time.
BACKGROUND OF THE INVENTION
FIGS. 1 and 2
show a conventional stem for a bicycle which comprises a column member
1
inserted and fixed into the front fork (not shown) and a lateral member
2
pivotally connected to the top of the column member
1
in the manner that the teeth portion
3
at the top of the column
1
is engaged with the teeth portion
4
at the end portion
5
of the lateral member
2
and that a first bolt
6
passes through the hole
7
at the center of the teeth portion
4
of the lateral member
2
and is tightly screwed into the threaded bore
8
at the center of the teeth portion
3
of the column member
1
. The angle between the column member
1
and the lateral member
2
can be adjusted by loosening the first bolt
6
. However, once the angle is adjusted, the handlebar
9
should consequently be rotatably adjusted by loosening a second bolt
10
so that the gripping portion at free end of the handlebar
9
is comfortably held by a user at an optimal angle and so that the brake lever (not shown) is adjusted to the desired position. Thus, such angle adjustments which involve operating the first and second bolts
6
,
10
, respectively, are quite troublesome.
SUMMARY OF THE INVENTION
To overcome the drawback of the conventional stern, an object of the present invention is to provide an improved stem which provides easy and convenient angle adjustment of the stem and the handlebar of a bicycle.
To achieve the objects mentioned above, the present invention provides an improved stem for a bicycle, said stem being adapted for fixing a handlebar, comprises:
a pivot member having a lateral member and a locking member attached to the underside of the lateral member, wherein the pivot member has two free ends each having a pivot portion and the locking member has two free ends as well;
a column member having a first connecting mechanism at the top thereof for pivotally connecting to the pivot portion; and
a sleeve member securing the handlebar, and being provided with a second connecting mechanism at the free end thereof for pivotally connecting the other pivot portion of the pivot member, whereby the locking member can be operated to move so that each free end thereof is fixedly attached to or detached from the first connecting mechanism and the second connecting mechanism so as to achieve the adjustment of the angle between the column member and the pivot member, and the angle of the handlebar, at the same time.
REFERENCES:
patent: 657290 (1900-09-01), Landis
patent: 908177 (1908-12-01), Watters
patent: 921457 (1909-05-01), Purdum
patent: 3361445 (1968-01-01), Hussey et al.
patent: 3388612 (1968-06-01), Oakley et al.
patent: 4688817 (1987-08-01), Marier
patent: 5327798 (1994-07-01), Lerch, Jr.
patent: 5515744 (1996-05-01), Liao
patent: 253155 (1948-11-01), None
patent: 1108558 (1955-10-01), None
Andrus Sceales Starke & Sawall LLP
Herrmann Allan D.
Hsin Lung Accessories Co. Ltd.
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