Machine element or mechanism – Control lever and linkage systems – Elements
Reexamination Certificate
2001-02-01
2002-06-25
Luong, Vinh T. (Department: 3682)
Machine element or mechanism
Control lever and linkage systems
Elements
C074S502400, C074S502600, C074S500500, C074S502200, C188S024110, C188S024220, C280S279000
Reexamination Certificate
active
06408714
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a rotary device on the head tube for stunt bicycles and the device employs principle of lever to have better force transferring efficiency.
BACKGROUND OF THE INVENTION
A conventional rotary device
80
for stunt bicycles is shown in FIG.
6
and generally, one of the two brake cables has to be separated into two breads
82
by using a separation device
81
as shown. The two breads
82
of the brake cable are respectively connected to two connection ports
83
on two far ends of a top plate. A lower plate has two connection ports
84
on two far ends thereof and two breads
820
extend from the two connection ports
84
and are connected to a rear brake mechanism. The top plate and the lower plate is connected with each other so that when the breads
82
are pulled, the breads
820
are activated to stop the rear wheel. The other brake cable
820
extends into the steerer tube and the head tube and is connected to a front brake mechanism. The conventional rotary device
80
involves complicated structure and the two breads
82
have to be pulled in balance to properly operate activate the brake system or jam problems could happen. The separation device
81
is an extra part that makes the assembly processes to be complicated.
The present invention intends to provide a rotary device that has simple structure and has a precise force transferring ability which makes the brake actions sharp and precise.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a rotary device for stunt bicycles. The rotary device comprises a bearing set movably mounted to a steerer tube and has two upright lugs and two downward lugs. A first collar is mounted to the steerer tube and has a first connection portion and a second connection portion respectively radially extending outward therefrom. The two upright lugs are pivotally connected to said first collar. A first lever member has a ring portion is mounted to the steerer tube and has a first connection port and a second connection port respectively radially extending outward therefrom. A first brake cable extends through the first connection port and is connected to the first connection portion of said first collar. The second connection port is pivotally connected to said second connection portion of said first collar. A second collar is mounted to the head tube and has a third connection portion and a fourth connection portion respectively radially extending outward from said second collar. The two downward lugs are pivotally connected to said second collar. A second lever member has a ring portion mounted to the head tube and a third connection port and a fourth connection port respectively radially extend outward from said second lever member. A second brake cable passes through the third connection port and is connected to said third connection portion of said second collar. The fourth connection port is pivotally connected to said fourth connection portion of said second collar.
The primary object of the present invention is to provide a rotary device for stunt bicycles wherein the bearing set is movably mounted to the steerer tube and pivotally connected to the two collars which are respectively connected to two brake cables so that the bearing set play a mediate role to allow the two collars to be pivoted to activate the brake system precisely.
These and further objects, features and advantages of the present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, several embodiments in accordance with the present invention.
REFERENCES:
patent: 4616523 (1986-10-01), Jones
patent: 4653768 (1987-03-01), Keys
patent: 4753448 (1988-06-01), Nagashima
patent: 4770435 (1988-09-01), Cristie
patent: 5605076 (1997-02-01), Wu
patent: 5690192 (1997-11-01), Kuo
patent: 5732601 (1998-03-01), Wu
patent: 5775709 (1998-07-01), Chen
patent: 6220398 (2001-04-01), Wu
Luong Vinh T.
Rosenberg , Klein & Lee
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