Reciprocating piston pump serviceable without tools
AssigneeGraco Minnesota Inc.
InventorsBenjamin J. Hitter, David J. Thompson, Dennis R. Peterson, William M. Blenkush
Life of this patent
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Abstract
The “no tools” pump removal system comprises a bearing housing attached to the drive housing. The bearing housing has a hinged door that when opened allows removal of the pump pin and then the pump. The bearing housing is provided with a latch assembly and a handle. A safety latch retains the handle in place during operation and until it is desired to remove the pump.
Claims19
A reciprocating piston pump for attachment to a reciprocating drive and having a reciprocating rod, a cylinder and a bearing housing, the improvement comprising a door attached to said bearing housing so as to releasably sandwich said cylinder between said bearing housing and said door and a latch mechanism configured to secure said door to said bearing housing, said cylinder comprising a cylindrical shoulder configured to mate with said bearing housing and said shoulder comprising upper and lower ends and said bearing housing comprises a shoulder that bears against said cylinder upper shoulder end, said door comprising an annular groove configured to mate with and retain said cylinder upper and lower shoulder ends.
A reciprocating piston pump assembly comprising:
- a pump including:
- a pump cylinder having a collar extending radially outward, wherein the collar includes a collar top and a collar bottom positioned opposite the collar top;
- and
- a reciprocating rod extending at least partially into the pump cylinder;
- a bearing housing defining a cavity with a bearing housing shoulder extending into the cavity, wherein the pump cylinder is positioned at least partially in the bearing housing cavity with the collar top positioned adjacent a bottom of the bearing housing shoulder, and wherein the bearing housing cavity is substantially open below the bearing housing shoulder so as to allow the pump cylinder to drop away from the bearing housing shoulder in a direction that is initially entirely axial when being released from the bearing housing;
- and
- a bearing housing door attached to the bearing housing and having a groove configured to receive the collar and support the collar at the collar top and at the collar bottom.
A reciprocating piston pump assembly comprising:
- a pump including:
- a pump cylinder having a collar extending radially outward, wherein the collar includes a collar top and a collar bottom positioned opposite the collar top;
- and
- a reciprocating rod extending at least partially into the pump cylinder;
- a bearing housing defining a cavity with a bearing housing shoulder extending into the cavity, wherein the pump cylinder is positioned at least partially in the bearing housing cavity with the collar top positioned adjacent a bottom of the bearing housing shoulder, and wherein the bearing housing cavity is substantially open below the bearing housing shoulder so as to allow the pump cylinder to drop away from the bearing housing shoulder when being released from the bearing housing;
- a bearing housing door attached to the bearing housing and having a groove configured to receive the collar and support the collar at the collar top and at the collar bottom;
- and
- a latch assembly comprising:
- a handle pivotably connected to the bearing housing;
- a latch connected to the handle and extending toward the bearing housing door and configured to attach to a protrusion hook of the bearing housing door when the bearing housing door is closed adjacent the bearing housing, wherein the latch comprises a u-bolt latch.
Dependencies are inferred from the claim text.