Spring brake actuator with dust guard
First Claim
1. A brake actuating mechanism comprising:
- a housing having first and second end walls with an opening centrally disposed in the first end wall;
an elastomeric diaphragm suspended within the housing and dividing the interior thereof into a first chamber and a second chamber, said diaphragm having a centrally disposed opening;
a hollow brake actuating rod disposed substantially in the first chamber for reciprocating movement between a retracted position and an extended position and having an interior space, a first end, and a second end, the actuating rod first end extending through the opening in the first end wall, and the actuating rod second end being open and extending into the second chamber through the diaphragm opening; and
a dust guard comprising a flexible tubular barrier disposed in a position to surround the actuating rod and having a first end and a second end, the tubular barrier second end in sealing engagement with the housing second end wall to seal the interior of the dust guard at the second end wall, and the tubular barrier first end projecting into the second chamber from the second end wall in sealing relationship with the actuating rod at least when the actuating rod is in the retracted position, whereby the interior space of the actuating rod will be effectively isolated from the remainder of the second chamber at least when the actuating rod is in the retracted position to prevent dirt buildup within the interior space of the actuating rod.
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Accused Products
Abstract
A dust guard is provided for a brake actuating mechanism comprising a housing having first and second end walls, an elastomeric diaphragm suspended within the housing, a brake actuating rod disposed within the housing for reciprocating movement relative to the housing and having a first end and a second end, the second end being directed towards the second end wall of the housing, and a spring disposed within the second chamber between the second end wall and the diaphragm. The dust guard comprises a resilient tubular barrier, attached at one to the second end wall, and extending inwardly axially to engage the actuating rod, or structure connected to the actuating rod, to isolate the second end of the actuating rod from the interior of the housing.
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Citations
18 Claims
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1. A brake actuating mechanism comprising:
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a housing having first and second end walls with an opening centrally disposed in the first end wall; an elastomeric diaphragm suspended within the housing and dividing the interior thereof into a first chamber and a second chamber, said diaphragm having a centrally disposed opening; a hollow brake actuating rod disposed substantially in the first chamber for reciprocating movement between a retracted position and an extended position and having an interior space, a first end, and a second end, the actuating rod first end extending through the opening in the first end wall, and the actuating rod second end being open and extending into the second chamber through the diaphragm opening; and a dust guard comprising a flexible tubular barrier disposed in a position to surround the actuating rod and having a first end and a second end, the tubular barrier second end in sealing engagement with the housing second end wall to seal the interior of the dust guard at the second end wall, and the tubular barrier first end projecting into the second chamber from the second end wall in sealing relationship with the actuating rod at least when the actuating rod is in the retracted position, whereby the interior space of the actuating rod will be effectively isolated from the remainder of the second chamber at least when the actuating rod is in the retracted position to prevent dirt buildup within the interior space of the actuating rod. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. In a spring brake comprising a housing having first and second end walls, an elastomeric diaphragm suspended within the housing and dividing the interior thereof into a first chamber and a second chamber, a brake actuating rod disposed within the housing for reciprocating movement between an extended position and a retracted position and having a first end and a second end, the second end being disposed within the second chamber and directed towards the second end wall of the housing, and a spring disposed within the second chamber between the second end wall and the diaphragm, the improvement comprising;
a dust guard having a flexible tubular barrier disposed in a position to surround the brake actuating rod at least when the brake actuating rod is in the retracted position, said tubular barrier having a tubular wall, a first end and a second end, the tubular barrier second end in sealing engagement with the second end wall to seal the dust guard at the housing second end wall, and the tubular barrier first end projecting into the second chamber from the housing second end wall in a position to effectively isolate the actuating rod second end from the remainder of the second chamber at least when the actuating rod is in the retracted position. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
Specification