Box lubrication pump

Patent metadata

Field	Value
Publication number	US-9803631-B2
Application number	US-201214343954-A
Country	US
Kind code	B2
Filing date	Nov 21, 2012
Priority date	Nov 22, 2011
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

A box lubricator that includes a pump with a piston housing and piston. The piston housing extends from a first end to a second end, and includes a bore extending through the piston housing from the first end of the piston housing to the second end of the piston housing. The piston housing also includes a recess disposed at the second end of the piston housing, the recess being concentric with the bore and comprising a diameter larger than a diameter of the bore. The piston is disposed inside the bore of the piston housing. At least one elastomeric seal is disposed inside the recess of the piston housing and around the piston. In some embodiments, a ball and socket joint connects the piston to the rocker arm assembly. In some embodiments, a fluid passage and a check valve are disposed inside the piston.

First claim

The invention claimed is:

1. A pump comprising:
a support post comprising a post first end opposite a post second end;
a piston housing extending from a housing first end to a housing second end, the piston housing including a bore extending through the piston housing from the housing first end to the housing second end;
a piston disposed inside the bore of the piston housing and comprising a piston first end opposite a piston second end, wherein the piston second end comprises a rounded surface;
a main body joining the support post and the piston housing; and
a rocker arm assembly extending from the post second end to the piston second end, wherein the rocker arm assembly is pivotally connected to the post second end and connected to the piston second end by a ball and socket joint, wherein the rocker arm assembly comprises:
an arm with an arm first end extending away from the post second end and toward the piston second end;
a seat connected to the arm first end and comprising a top plate and a dimple formed in the top plate, wherein the dimple mates with the rounded surface of the piston second end, and wherein a cross-section of the seat is U-shape;
a coupler connected to the piston second end and connected to the seat, thereby joining the rounded surface of the piston second end and the dimple of the seat to form the ball and socket joint between the piston second end and the rocker arm assembly arm, wherein the coupler comprises:
a platform positioned between the housing second end and the top plate of the seat, wherein the platform is connected to the piston between the piston first end and the piston second end;
a first side and a second side both extending from the platform toward the arm first end and past the top plate of the seat;
a first prong connected to the first side and extending between the arm first end and the top plate of the seat; and
a second prong connected to the second side and extending between the arm first end and the top plate of the seat; and

a spring is disposed around the piston housing between the main body and the coupler of the rocker arm assembly, wherein the spring is seated on the platform of the coupler.

2. The pump of claim 1 , wherein the rocker arm assembly further comprises;
a roller;
and
a roller joint connecting the roller and the seat to the arm first end.

3. The pump of claim 1 , further comprising;
a piston housing inlet intersecting the bore between the housing first end and the housing second end;
a fluid pathway fluidly connecting the piston housing inlet with the post first end;
a pump inlet passage formed inside the support post and extending through the support post;
a drip tube connected to the post first end and to the pump inlet passage; and
wherein the drip tube fluidly connects the pump inlet passage to the fluid pathway in the main body.

4. A pump comprising:
a support post comprising a post first end opposite a post second end;
a piston housing extending from a housing first end to a housing second end, the piston housing including a bore extending through the piston housing from the housing first end to the housing second end;
a piston disposed inside the bore of the piston housing and comprising a piston first end opposite a piston second end, wherein the piston second end comprises a rounded surface;
a main body joining the support post and the piston housing; and
a rocker arm assembly extending from the post second end to the piston second end, wherein the rocker arm assembly is pivotally connected to the post second end and connected to the piston second end by a ball and socket joint, wherein the rocker arm assembly comprises:
an arm with an arm first end extending away from the post second end and toward the piston second end;
a seat connected to the arm first end and comprising a top plate and a dimple formed in the top plate, wherein the dimple mates with the rounded surface of the piston second end;
a coupler connected to the piston second end and connected to the seat, thereby joining the rounded surface of the piston second end and the dimple of the seat to form the ball and socket joint between the piston second end and the rocker arm assembly arm, wherein the coupler comprises:
a platform positioned between the housing second end and the top plate of the seat, wherein the platform is connected to the piston between the piston first end and the piston second end;
a first side and a second side both extending from the platform toward the arm first end and past the top plate of the seat;
a first prong connected to the first side and extending between the arm first end and the top plate of the seat;
a second prong connected to the second side and extending between the arm first end and the top plate of the seat; and
a plurality of spring guards extending from the platform toward the piston housing; and

a spring is disposed around the piston housing between the main body and the coupler of the rocker arm assembly, wherein the spring is seated on the platform of the coupler.

Assignees

• Graco Minnesota Inc
• Graco Minnesota Inc

Inventors

• Shakal Anthony J

Classifications

• F04B53/02

  Packing the free space between cylinders and pistons · CPC title

• F04B1/0448

  Sealing means, e.g. for shafts or housings (for pistons F04B1/0408 {; Stoffing boxes F04B53/164}) · CPC title

• F16N13/14 Primary

  with cam or wobble-plate on shaft parallel to the pump cylinder or cylinders · CPC title

• F04B1/0443

  Draining of the housing; Arrangements for handling leaked fluids · CPC title

• F04B53/18

  Lubricating · CPC title