GB2054072A

GB2054072A - Caliper brake

Info

Publication number: GB2054072A
Application number: GB8010764A
Authority: GB
Original assignee: Horton Manufacturing Co Inc
Current assignee: Horton Manufacturing Co Inc
Priority date: 1979-06-29
Filing date: 1980-03-31
Publication date: 1981-02-11
Also published as: CH642309A5; DE3011006C2; FR2460421A1; AU5714180A; DE3011006A1; AU520322B2; JPS566932A; CA1135202A; FR2460421B1; GB2054072B

Abstract

A caliper disc brake (A) includes a base (10) having a single pole (14) extending therefrom with a pair of identically formed opposed arms (16, 28) pivotally mounted on the pole. On one end of each of the arms is pivotally mounted a brake shoe (34, 58), and the other ends of the arms have an air bladder (66) interposed therebetween for moving the brake shoes together. Each of the arms (16, 28) carries an adjustable pin (76, 78) engageable with a stop pin (74) mounted on the base (10) and extending centrally between the arms for orienting the arms relative to disc (D). The air bladder (66) is mounted between the other ends of the arms for pivoting the arms and moving the brake shoes together, the bladder having an intrinsic spring return properties which separate the brake shoes when the air bladder is deactivated. <IMAGE>

Description

SPECIFICATION Caliper brake The invention relates to an improvement in what is commonly known in the trade as a caliper brake. Known caliper brakes include linkages of one sort or another which have disadvantages of construction effectiveness and maintenance.

According to the present invention there is provided a caliper brake comprising a base, first and second brake arms, means pivotally mounting said brake arms on a single pole in juxtaposition on said base, a first brake shoe having a friction facing thereon, means pivotally mounting said first brake shoe on one end of said first brake arm, a second brake shoe having a friction facing thereon, means pivotally mounting said second brake shoe on one end of said second brake arm, means interposed between the other ends of said brake arms for pivoting said arms and the friction facings thereof the arm towards the other to grip a disc positioned between said shoes and away from each other for release of the disc, and means for aligning said brake arms relative to an axis of said base.

By way of example, one embodiment of a caliper brake according to the invention will now be described with reference to the accompanying drawings in which: 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 Figure 3.

Referring to the drawings in detail, the caliper brake A includes the base 10 having a boss 11 which has the hole 1 2 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 1 6 which includes the flat portion 1 8 on the inner end of which is formed the end boss 20 having the hole 22 formed therethrough. The flat portion 1 8 has a side boss 24 formed thereon and through which is formed the hole 26 the axis of which is parallel to the axis of the hole 22. The outer end of the arm 1 8 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 accompanied by a lower-case letter a. The first arm 1 6 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 11. Mounted on the pole 14 on top of the boss 24 is the upper spacer ring 32, and mounted 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 such a juxtaposed position 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 receives 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 strengthened by a pair of spaced flanges 50. The shoe 34 is pivotally mounted on the boss 20 of the arm 1 6 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 provided 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 ietter a. Each of the pins 42 and 42a has a ring 59 connected 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.

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, with 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 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 of a pair of bolts 68 and 70. The bladder is connected to an air supply line 72 which is used to expand the bladder which brings the shoes closer together while the intrinsic resilience 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 1 6 and 28 and against which the guide pins 76 and 78 are adjustably positioned. The pin 76 is threadedly mounted in the arm 1 6 with the lock nut 80 whereby the pin 76 may be caused to extend more or less inwardly of the arm 1 6. 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 be braked such as D.

An advantage of this embodiment of the invention is that a caliper brake is provided which has a minimum 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 circular saw or sprocket. The construction allows easy replacement and interchange of brake shoes.

Furthermore, the pivoted brake arms are identical which reduces the cost of manufacture and inventor classification. The caliper brake has a pin on each arm for simply and effectively orienting the brake shoes relative to the disc member to be braked.

The brake shoes each have arcuate inner and outer edges with the ends thereof on a radius which gives even pressure over the entire area of the shoe and allows a greater area 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 with the greater speed of travel at greater diameters of a disc to be braked.

Claims

1. A caliper brake comprising a base, first and second brake arms, means pivotally mounting said brake arms on a single pole in juxtaposition on said base, a first brake shoe having a friction facing thereon, means pivotally mounting said first brake shoe on one end of said first brake arm, a second brake shoe having a friction facing thereon, means pivotally mounting said second brake shoe on one end of said second brake arm, means interposed between the other ends of said brake arms for pivoting said arms and the friction facings thereof the arm towards the other to grip a disc positioned between said shoes and away from each other for release of the disc, and means for aligning said brake arms relative to an axis of said base.

2. A caliper brake as claimed in Claim 1 in which said means pivotally mounting said brake arms on a single pole includes said first arm having a hole therethrough and said second arm having a hole therethrough with said pole positioned through the holes of said arms.

3. A caliper brake as claimed in Claim 1 or Claim 2 in which said means pivotally mounting said first brake shoe on one end of said first brake arm includes said first brake arm having a hole formed therethrough, said first brake shoe having a pair of spaced flanges each having a hole formed therethrough with said holes of said flanges positioned in alignment with said hole of said first brake arm, and a pin positioned in the holes of said flanges and said hole of said first brake arm, said second brake arm having a hole formed therethrough, said second brake arm having a hole formed therethrough, said second brake shoe having a pair of spaced flanges each having a hole formed therethrough with said holes of said flanges positioned in alignment with said hole of said second brake arm, and a pin positioned in the holes of said flanges of said second brake shoe and said hole of said second brake arm.

4. A caliper brake as claimed in Claim 1, Claim 2 or Claim 3 in which each of said brake shoes and friction facing thereon has opposed edges that are arcuate and parallel.

5. A caliper brake as claimed in any preceding claims in which said means interposed between the other ends of said brake arms is an air bladder.

6. A caliper brake substantially as hereinbefore described with reference to and as shown in the accompanying drawings.