Brakes – Wheel – Transversely movable
Reexamination Certificate
2000-03-29
2001-07-03
Schwartz, Christopher P. (Department: 3613)
Brakes
Wheel
Transversely movable
C188S074000, C188S10600P
Reexamination Certificate
active
06253884
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a rear brake unit for a beach buggy, particularly to one having a brake disc of high strength and with no fear of disfiguring, having comparatively better effect for braking.
Common conventional beach buggies have a rear wheel brake unit for controlling to reduce speed and stop the buggy. Its operating method includes a brake wire pulling brakes members of the rear wheel axle to expand to friction with an inner surface of a brake drum rotating with the axle of the rear wheels, achieving speed reduction and stop of the buggy.
A known conventional rear brake unit of a beach buggy has a structure shown in
FIGS. 1 and 2
, including a axle sleeve
10
fitted around a rear wheel axle
50
, a brake disc
20
welded with an outer end of the sleeve
10
by means of CO
2
, a position rod
201
fixed on the brake disc
20
and an activating rod
202
connected to and pulled by a brake wire
2031
(not shown in Figures), two semicircular brake members
203
located beside the brake disc
2
fixed between and pulling to expand or loosening the brake members
23
. The two semicircular brake members
23
have one end clamping the position rod
201
of the brake disc
20
, not separating from the brake disc
20
, and the other end clamping a flat activating block
2021
of the activating rod
202
, as shown in FIG.
2
. Further a brake drum
30
surrounds the two semicircular brake members
203
engaging and rotating with the rear axle
50
, which has its end engages with the brake drum
30
. Further, a dirt cover
40
is fixed to hide the brake drum
30
, preventing dirt from entering the brake drum
30
to avoid undesirable wear and tear to affect braking effect.
The conventional brake disc
20
and the brake drum
30
are generally made of iron, and the brake disc
20
and the shaft sleeve
10
are welded together with CO
2
, but the brake disc
20
may often disfigure in welding process. Once the brake disc
20
disfigures, an angle inclination may be formed to the shaft sleeve
10
, not vertical, causing the position rod
201
of the brake disc
20
and the activating rod
202
also incline, not parallel to the axle
50
worsening contact of the brake members
203
with the brake drum
30
and lessening the dimensions of mutual friction and braking effect. In addition, the brake members
203
may bias to easily produce friction against the iron brake drum
30
and thus heighten temperature to make noise. In addition, when the brake wire pulls the activating rod
202
to activate the brake members
203
, the brake members
203
can only partly touch and friction with the brake drum
30
owing to the inclined activating rod
202
, causing the brake disc
20
seriously disfigure under unbalanced friction. Furthermore, the brake drum
30
is hidden in the brake cover
40
, forming a double-layer design, the brake drum
30
and the brake members
203
have to be reduced in their size, as the brake unit cannot be enlarged in order not to affect the other structures. Subsequently, the brake drum
30
is made to have a smaller inner diameter and thus also a smaller dimensions in the inner space, lessening accordingly the friction dimensions between the brake members
203
and the b rake drum
30
to lower braking effect. This structural problem of the conventional rear brake device has to be solved.
SUMMARY OF THE INVENTION
The objective of the invention is offer a rear brake device for a beach buggy, which has a brake disc of high strength, with no fear of disfiguration, increasing friction dimensions to enhance braking stability and simplifying assembling.
The feature of the invention involves an axle sleeve for a rear wheel axle to extend in, a brake disc with two semicircular brake members and a brake drum having a center serrated tube for the axle to engage and rotate together. The two semicircular brake members are pulled by two coil springs to pull them back after they are expanded to stop the rotation of the brake drum after pulling a brake wire to move an activating rod in expanding the brake drum. The characteristics of the device is that one end of the axle sleeve facing the brake disc is fixed firmly on the brake disc, to prevent the brake disc from disfiguring, and that the brake drum directly covers the outside of the brake disc, and a cylindrical fix member fitting around the axle forces the brake drum touch the brake disc and seals the serrated connect tube with a dirt rubber ring fitting around the joint locations of the brake drum and the brake disc. Then the contact dimensions of the brake members with the brake drum is increased to enhance braking effect to stop a beach buggy more quickly than the conventional one.
REFERENCES:
patent: 4646865 (1987-03-01), Imaizumi et al.
patent: 4719984 (1988-01-01), Watanabe
patent: 6073731 (2000-06-01), Ieda
patent: 6182800 (2001-02-01), Mochizuki et al.
Aeon Motor Co., Ltd.
Pro-Techtor Inter-national Services
Schwartz Christopher P.
Sy Mariano
LandOfFree
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