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US 4,071,119 AGranted
Dashpot assembly
AssigneeSchmelzer Corporation
InventorBenjamin C. Benjamin
Life of this patent
Estimating the term…
Abstract
A dashpot assembly having a single annular diaphragm the inner periphery of which forms a valve movable relative to a metering passage between chambers formed at opposite sides of a plunger assembly in the dashpot. Upon movement in one direction the valve element requires air to pass through the metering passage and upon movement in the opposite direction the valve moves out of engagement to permit free flow between opposite sides of the plunger. The dashpot incorporates a ring element which serves to maintain the metering passage free of obstructions and dirt and which extends the effective area of the diaphragm.
Claims10
A dashpot comprising;
- a housing, a plunger assembly movable axially in said housing and being formed with an annular cavity open radially outwardly, an annular diaphragm having its outer periphery connected to said housing in fluid tight relationship, said plunger having an annular wall in said cavity, an annular valve formed at the inner periphery of said diaphragm and being disposed in said cavity for engagement with said annular wall to form first and second fluid chambers on opposite sides of said diaphragm, a metering notch formed in said annular wall of said plunger assembly and extending radially between said valve and wall to permit continuous restricted fluid communication between said first and second chambers, a ring positioned for limited movement relative to said plunger assembly between said diaphragm and said annular wall at the outer periphery of said plunger assembly to maintain said annular valve in said cavity, said plunger assembly being movable in one direction with said valve in engagement with said wall of said plunger assembly to resist fluid flow from said first to second chamber through said metering notch to restrict movement of said plunger assembly, said plunger assembly being movable in the opposite direction to flex said annular valve out of engagement with said wall of said plunger assembly to permit relatively free fluid movement from said second chamber to said first chamber for rapid return movement of said plunger assembly.
A dashpot comprising;
- a housing, a plunger assembly movable axially in said housing and having a pair of axially spaced annular walls forming an annular cavity open radially outwardly, an annular diaphragm having its outer periphery connected to said housing in fluid tight relationship, an annular valve formed at the inner periphery of said diaphragm and being disposed in said cavity for engagement with one of said walls to form first and second fluid chambers in said housing on opposite sides of said diaphragm, a metering notch formed in said one wall of said plunger assembly and extending radially of said annular valve element to permit continuous restricted fluid communication between said first and second chambers when said valve element is in engagement with said one annular wall, a ring positioned in said cavity and extending beyond the outer periphery of said walls and said metering notch for limited axial movement relative to said plunger assembly between said diaphragm and said one wall and maintaining said annular valve in said cavity, said plunger assembly being movable in one direction to move said diaphragm into engagement with said ring to urge the latter and said valve into engagement with said one wall to resist fluid flow from said first to said second chamber through said metering notch and between said one wall at one side and side valve and ring at the other side to retard movement of said plunger assembly in one direction, said plunger assembly being movable in the opposite direction to flex said diaphragm into engagement with the other wall and flex the annular valve out of engagement with said one wall to permit axial movement of said ring and relatively free fluid flow from said second chamber to said first chamber for rapid return movement of said plunger assembly.
Dependencies are inferred from the claim text.