Note: Descriptions are shown in the official language in which they were submitted.
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SUM~RY
The invention relates to an improvement in what
; is commonly known in the trade as a caliper brake.
Known caliper brakes includes linkages of one sort or
another which have disadvantages of construction
effectiveness and maintenance.
It is an object of the invention to provide a
caliper brake having a single pole on which a pair of
brake arms are pivotally mounted. On one end of each
lo arm is pivotally mounted a brake shoe in opposed
relation and between the other ends of the arms is
mounted an air bladder which when expanded moves the
i shoes together for braking a disc associated with a .
machine for braking, the disc interposed between the
shoes. The air bladder being of resilient material
has intrisic return properties which returns the brake
shoes to a separated condition.
It is a further object of the invention to provide
a caliper brake which has a mini~um of parts and which
has a deep throat construction that allows the brake
~, shoes to be placed e.g. inwardly of a row of teeth of
a circle saw or sprocket. The construction alloWs
easy replacement and interchange of brake shoes.
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It is a further object of the invention to provide
a caliper brake in which the pivoted brake arms are
identical which reduces the cost of manufacture and
inventor classification. It is also an object of the
invention to provide a caliper brake having a pin on
each arm for simply and effectively orienting the brake
shoes relative to the disc member to be braked.
It is a still further object of the invention
to provide brake shoes each having arcuate inner
and outer edges with -the ends thereof on a radius
which gives even pressure over the entire area of the
shoe and allowing a greater area of brake surface
for a caliper brake which gives lower shoe temperature
and wear. The arc length of the shoe with each end
formed on a radius provides additional shoe area radially
outwardly which keeps up ~ith the greater speed of travel
at greater diameters of a disc to be braked.
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The invention will appear more clearly fxom the
following detailed description when taken in connection
with the accompanying drawings, showing by way of
example a preferred embodiment of the inventive idea
; wherein like numerals refer to like parts throughout.
In the drawings forming part of this application:
Figure 1 is a perspective view of a caliper brake
embodying the invention with a disc to be braked
shown in phantom-outline.
Figure 2 is a perspective view of the arms of
the brake shown as removed therefrom.
; Figure 3 is a sectional view on the line 3-3
of Figure 1.
Figure 4 is a sectional view on the line 4-4
of Figure 1.
Figure 5 is a sectional view on the line 5-5
of Figure 3. ~ ,
Figure 6 is a view on the line 6-6 of Figuro 3.
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Referring to the drawings in detail, the caliper
brake A includes the base 10 having a boss 11 which has
the hole 12 formed therein and in which the lower
portion of the single pole 14 is press fit into the
~- hole 12. Further provided is a first pivoting brake
arm 16 which includes the flat portion 18 Oll the inner
end of which is formed the end boss 20 having the
hole 22 formed therethrough. The fla~ portion 18
has a side boss 24 formed thereon and through which
lo is formed the hole 26 the axis of which is parallel
to the axis of the hole 22. The outer end of the
arm 18 is formed with the holes 25 and 27.
The numeral 28 designates a second pivoting
brake arm that is identical to the first arm identical
.~ parts of which bear identical reference numerals ac-
companied by a lower-case let~er a. The first arm 16
is pivotally mounted on -the pole 14 with the pole
extended through the friction bearing 29 mounted in
the hole 26 and the arm bottoming out on the lower
spacer-ring 30 positioned on top of the base boss il.
Mounted on the pole 14 on top of the boss 24 is the
upper spacer ring 32, and rnoun-t~d upon the pole 14
and upon the ring 32 is the boss 24a of the second
pivoting arm 28. With the arms pivotally mounted in
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such a juxtaposed positions the same may be pivoted ;,
to and from the other as will be further described
hereinafter.
The numeral 34 designates a first brake shoe
including the plate portion 36 from which extends
a pair of spaced flanges 38 and 40 each having a
hole 41 formed therethrough which receive the pin
42. Secured to the plate portion 36 is the friction
facing 44. The flange 38 is strengthened by the
spaced webs 46 and 48 formed integral with the flange
38 and plate portion 36. The flange 40 is strength-
ened by a pair of spaced flanges 50. The shoe 34 is
pivotally ~ounted on the boss 20 of the arm 16 by
positioning the pin 42 through the holes 41 of flanges ~ ~ :
38 and 40 and through the bearings 54 and 56 in the
hole 22 of the boss 20.
Further pro~ided is a second brake shoe 58 which
is identical to shoe 34 but mounted as a left with
respect to shoe 34 as a right, the identical portions
bearing identical reference numerals but accompanied
by a lower case letter a. Each of the pins 42 and 42a
has a ring 59 con.nected to the top end thereof for
easy insertion and removal of the pin for maintenance
of the brake shoes. The arm 28 is pivotally secured
upon the arm 16 by means of the lock ring 60.
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Each of the shoe plate portions 36 and 36a, is
arcuately formed to a radius on both inner and outer
edges 62 and 64, respectively, wi-th the ends 61 and
63 on a radius. It has been found that with the
increase of arc length and area of a shoe travel
there is an increase of wear due to the greater velocity
at the outer extremity and that with the increase
of arc in the friction linings, which coincide with
the shoes, the wear throughout the lining faces is
lo substantially even with the instant invention.
The numeral 66 designates a conventional air
bladder mounted between the ends of the arms 16 and
28 on each side by means o~ a pair of bolts 68 and
70. The bladder is conn~cted to an air supviy line
72 which is used to expand the bladder which brings
the shoes closer together while the intrinsic resi-
lience of the bladder returns the arms together and
the shoes apart.
Further provided is the central stop pin 74
anchored in and extending upwardly from the base 10
and centrally between the arms 16 and 28 and against
which the guide pins 76 and 78 are adjustably positioned.
The pin 76 is threadedly mounted in the arm 16 with
the lock nut 80 whereby the pin 76 may be caused to
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extend more or less inwardly of the arm 16. The
pin 78 is similarly and threadedly mounted in the arm : -'
28 with the lock nut 82 whereby the pin 78 may be
caused to extend more or less inwardly of the arm
28. With the pins 76 and 78 used in conjunction
:~ with the stop pin 74 the shoes may be oriented easily ~ ~
and precisely for equal braking with regard to a ~ - :
disc to braked such as D.
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