Patent ID: 8528767

Claim:
A hydraulic reservoir comprising: a reservoir tank having an interior cavity for retaining a fluid and an aperture fluidly connecting the interior cavity to an exterior region of the reservoir and a flange formed on the reservoir tank around the aperture; a cover selectively engagable with the reservoir tank, the cover movable between an open position, wherein the fluid path through the aperture in the reservoir tank is at least partially open, and a closed position, wherein the fluid path through the aperture is substantially closed; a seal disposed between the cover and the flange; a pressure relief mechanism including at least one pressure responsive fastener releasably connecting the cover to the reservoir tank, the at least one pressure responsive fastener including a fastener fixed for concurrent movement with one of the cover and the reservoir tank, and a biasing member operably connecting the fastener to whichever of the cover and reservoir tank is not fixed for concurrent movement with the fastener, wherein the pressure responsive fastener operates between the cover and the flange so as to apply a clamping force on the seal until an internal pressure in the reservoir tank exceeds a specified level; and a retaining cup fixedly attached to the reservoir tank, the biasing member disposed within the retaining cup; and a fastening element associated with the retaining cup, the retaining cup configured to prevent movement of the fastening element when the fastener and the fastening element engage.