Packing nut and rod guide for piston paint pumps
AssigneeWagner Spray Tech Corporation
InventorsThomas H. Flaig, Norman A. Cyphers
Life of this patent
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Abstract
A combined packing nut and rod guide for piston paint pumps has a body with a central bore therethrough and at least one relief extending axially along the bore providing a lubricating passageway and paint leakage path. An annular reservoir is formed at an interior end of the nut body for lubricating fluid. The nut body has axial and radial surfaces to axially and radially position the combined packing nut and rod guide in the pump housing to locate and maintain the position of the piston rod with respect to the housing.
Claims15
A combined packing nut and rod guide for reciprocating paint pumps of the type having a piston rod end extending axially exteriorly of and sealed to a pump housing, the combined packing nut and guide comprising a nut body removably secured to the pump housing and having:
- a. a first end extending exteriorly of the pump housing;
- b. a second end extending into the pump housing and axially loading a rod packing set;
- c. a central bore extending axially through the nut body and sized to closely interfit with the piston rod for guiding the rod in the housing;
- and
- d. at least one relief extending completely axially through the nut body adjacent the bore for providing a lubricating passageway along the piston rod.
An assembly for increasing the side load capability while sealing reciprocating piston paint pumps against leakage, the assembly comprising:
- a. a pump housing;
- b. a piston rod located in the pump housing for reciprocating pumping motion with respect thereto;
- c. a rod packing set located between the piston rod and the pump housing for sealing the rod to the pump housing while permitting the reciprocating motion of the rod;
- and
- d. a nut body removably secured to the pump housing and having:
- i. a first end extending exteriorly of the pump housing,
- ii. a second end extending into the pump housing and axially loading the rod packing set,
- iii. a central bore extending axially through the nut body and sized to closely interfit with the piston rod for guiding the rod in the housing, and
- iv. at least one relief extending completely axially through the nut body adjacent the bore for providing a lubricating passageway for the piston rod such that the piston rod is reinforced against side loads by the packing nut and the relief provides a path for paint leakage at such time as the rod packing set fails to seal.
Dependencies are inferred from the claim text.