Brakes – Wheel – Transversely movable
Reexamination Certificate
2000-12-04
2001-12-04
Schwartz, Chris (Department: 3613)
Brakes
Wheel
Transversely movable
C188S10600P, C188S10600P
Reexamination Certificate
active
06325183
ABSTRACT:
BACKGROUND OF INVENTION
1. Field of the Invention
This invention relates to a brake cable mounting structure suitable for a drum brake structure for a rear wheel. More specifically, this invention relates to a brake cable mounting structure which has a crank mechanism spreading a pair of brake shoes apart and is capable of operating the crank mechanism remotely.
2. Description of Related Art
For example, the brake cable mounting structure for the drum brake is disclosed in the Japanese Patent Application Unexamined Publication Number 6-337027 filed by this applicant.
FIGS. 7-10
explain a drum brake device employing this brake cable mounting structure. A pair of brake shoes
110
,
120
are moveably mounted on a back plate
100
by shoe hold mechanisms
111
,
121
. In
FIG. 7
, lower adjacent ends of the brake shoes
110
,
120
are supported by a supporting portion
201
of an almost L-shaped anchor
200
while upper adjacent ends of the brake shoes
110
,
120
are connected via an adjuster
130
. An upper shoe return spring
160
is extended between the upper adjacent ends of the brake shoes
110
,
120
and a lower shoe return spring
160
is extended between the lower adjacent ends of the brake shoes
110
,
120
, maintaining the abutment of the two brake shoes
110
,
120
against the adjuster
130
and the anchor
200
.
A crank mechanism
300
comprises a brake lever
320
, a strut
330
and a lever pin
310
. The crank mechanism
300
is positioned adjacent to the supporting portion
201
of the anchor
200
between the two brake shoes
110
,
120
. The brake lever
320
comprises two facing long plates. A notched groove
321
formed at the superimposing portion on the right side of the plates in
FIG. 8
is functionally engaged with the right brake shoe
110
. Referring to
FIG. 8
, an arc-shaped groove
322
formed on the forked legs on the left side of the two plates receives a cable end nipple
420
of the brake cable
400
. A strut
330
, integrally formed from a deformed piece of plate, comprises two facing plate portions connected on their upper edges by a bridge
332
and positioned between the two brake shoes
110
,
120
. A notched groove
331
formed at the superimposing portion on the left side of the strut
330
in the
FIG. 8
is functionally engaged with the left brake shoe
120
.
The brake lever
320
is inserted from the opposite side of the bridge
332
into a space formed between the two facing plate portions of the strut
330
, and upper right ends of the brake lever
320
is pivotally supported relative to the strut
330
through the lever pin
310
acting as the fulcrum as depicted in FIG.
8
.
As is evident from
FIG. 8
, clockwise rotation of the brake lever
320
with the lever pin
310
is restricted by abutting against the bridge
332
of the strut
330
. A guide pipe
500
and the brake cable
400
, which act as a remote force transmitting member, pass through the back plate
100
for the purpose of engaging and acting upon the arc-shaped groove
322
as an input force portion of the brake lever
320
. The guide pipe
500
is depicted in
FIGS. 8-10
. The guide pipe
500
is so designed that the overhanging portion
501
, integrally formed on the intermediate portion of the guide pipe
500
, contacts a back of an anchor seat
202
of the anchor
200
. An upper portion of the guide pipe
500
penetrates through a hole on the anchor seat
202
and is projected outwardly from the surface of the anchor seat
202
. The projected outwardly end portion is widened in opposite directions as shown in
FIG. 8
; therefore, the guide pipe
500
is integrated with the anchor
200
. The widened end
502
of the guide pipe
500
is designed to be partially widened toward both sides of the brake shoes
110
,
120
. However, the shape of the projected outwardly end portion is not limited to the partially widened shape depicted in FIG.
8
and may be a widened shape in the direction as long as it can secure a thickness of the supporting portion
201
of the anchor
200
without becoming an obstacle to components of the drum brake device.
The brake cable
400
is comprised of an outer casing
430
, an inner cable
410
and so on. A large diameter portion of a casing cap
431
, fixed with an end of the outer casing
430
, abuts against an outer opening end of the guide pipe
500
. A small diameter portion of the casing cap
431
fits into a hole of the guide pipe
500
. Then, the brake cable
400
is retained on the guide pipe
500
by a wire spring clip
440
. A means to retain the casing cap
431
on the guide pipe
500
may be utilized so long as the casing cap
431
is retained on the guide pipe
500
until the operational end (not shown) of the brake cable
400
is attached on a corresponding member. As an alternative, the casing cap
431
may be press fit into the hole of the guide pipe
500
instead of using the clip
440
.
The inner cable
410
is slidably inserted into the outer casing
430
, and the top side of the inner cable
410
projected out from the casing cap
431
as shown in FIG.
8
. The inner cable
410
is passed through the guide pipe
500
, where a pin portion
421
of the cable end nipple
420
is secured on the top end of the inner cable
410
, which is connected on the arc-shaped groove
322
of the brake lever
320
. A dust boot
411
with bellows is positioned and connected between the casing cap
431
and the cable end nipple
420
, performing a water proof function into the outer casing
430
. For the purpose of maintaining the lower weight of the drum brake, a relatively lighter plate material is used to form the back plate
100
. Then, in order to maintain certain high strength requirements for this particular portion: the central portion of the back plate
100
, the portion adjacent to the anchor
200
and the connecting portion thereof, a back plate stiffener
101
is provided at the portion on the back plate
100
and is substantially integrated with the back plate
100
such as by welding.
The back plate
100
and the stiffener
101
are fixed on the brake mounting member
150
(e.g., an axle as a member of stationary part of the vehicle) having almost the same outline of the mounting surface as the stiffner
101
by four instalation bolts
140
,
140
,
141
,
141
and corresponding nuts (not shown in the figure). Each of the two bolts
140
,
140
at the anchor
200
side has a serration
142
on its intermediate portion. The serrations
142
,
142
are pre-press-forced into installation holes
601
,
601
formed on a later-described spacer
600
after passing through the anchor seat
202
of the anchor
200
, the back plate
100
and the back plate stiffener
101
; therefore the anchor seat
202
is temporary fixed on the back plate
100
. The right side of the brake lever
320
and the left side of the strut
330
in
FIG. 8
are slidably supported by the bolt heads
143
,
143
of the bolts
140
,
140
. Finally, the anchor
200
will be firmly fixed to the brake mounting member
150
when the nuts (not shown in the figure) are tightly screwed with the bolts
140
,
140
.
Central portions of the back plate
100
and the stiffener
101
are fixed to the brake mounting member
150
via a bearing hub seat (not shown in the figure). Since the bearing hub seat is not extended to the anchor
200
for the purpose of maintaining the lower weight, the spacer
600
with about the same thickness as the bearing hub seat is placed between the stiffener
101
and the brake mounting member
150
. This embodiment illustrates the spacer
600
where the serrations
142
,
142
formed on the two bolts
140
,
140
are press-forced into the installation holes
601
,
601
of the spacer
600
and are pre-integrated in the drum brake.
Brake operation of the above-explained structure is explained below. If the operation side of the inner cable
410
(not shown in the figure) is pulled, the intermediate portion of the curved outer casing
430
tends to be deformed back to a straight. The casing cap
431
is supported by the guide pipe
500
Liniak Berenato Longacre & White
Nisshinbo Industries Inc.
Schwartz Chris
LandOfFree
Brake cable mounting structure for a drum brake does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Brake cable mounting structure for a drum brake, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Brake cable mounting structure for a drum brake will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2596472