PNEUMATIC CONSTRICTING DRUM BRAKE ASSEMBLY
First Claim
Patent Images
1. A pneumatic constricting drum brake comprising:
- (a) a housing with an annular array of brake elements operably disposed therein for radial movement;
(b) a brake drum disposed for rotary movement with respect to the housing, the drum having an annular hub and an annular braking surface disposed radially outwardly of the hub about the outer periphery;
(c) an inflatable disposed between the housing and brake elements and operable upon inflation to move the brake elements into contact with the braking surface; and
,(d) an annular seal disposed on each of opposite axial ends of the hub for rotation therewith, wherein the housing includes a plurality of spaced sealing surfaces each contacting one of said annular seals for sealing the interior of the hub.
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Accused Products
Abstract
A pneumatic constricting drum brake with seals attached to axially opposite sides of the hub of the rotating drum with wiper portions of the seals rotatably contacting correspondingly located stationary sealing surfaces on the housing for sealing the hub. At least one of the housing sealing surfaces includes a bearing mount.
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Citations
14 Claims
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1. A pneumatic constricting drum brake comprising:
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(a) a housing with an annular array of brake elements operably disposed therein for radial movement; (b) a brake drum disposed for rotary movement with respect to the housing, the drum having an annular hub and an annular braking surface disposed radially outwardly of the hub about the outer periphery; (c) an inflatable disposed between the housing and brake elements and operable upon inflation to move the brake elements into contact with the braking surface; and
,(d) an annular seal disposed on each of opposite axial ends of the hub for rotation therewith, wherein the housing includes a plurality of spaced sealing surfaces each contacting one of said annular seals for sealing the interior of the hub. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of making a drum brake comprising:
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(a) providing a housing; (b) disposing a brake drum with a hub and a radially outer circumferential braking surface for rotation on the housing; (c) disposing an annular array of brake elements about the outer circumference of the drum for radial movement with respect thereto; (d) disposing an inflatable between the housing and the brake elements and upon inflation, moving the elements into contact with the outer circumference of the drum; (e) disposing annular seals on axially opposite sides of the hub; (f) providing sealing surfaces on the housing on axially opposite sides of the hub; and
,(g) contacting the housing sealing surfaces with the annular seals and effecting rotary sealing about the hub. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification