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US 7,125,228 B2Granted
Pressure washer having oilless high pressure pump
AssigneeBlack & Decker Inc.
InventorsShane Dexter, Mark W. Wood, Allen Palmer, William B. Daniel
Life of this patent
Estimating the term…
Abstract
An oilless high pressure pump suitable for use in devices such as pressure washers and the like is described. The pump includes an eccentric assembly suitable for converting rotary motion of a rotating shaft to rectilinear motion. One or more straps couple the eccentric assembly to a piston assembly. The straps communicate the rectilinear motion of the eccentric assembly to the piston assembly, reciprocating the piston assembly to pump the liquid.
Claims25
A pressure washer, comprising:
- a frame;
- an engine mounted to said frame;
- and a pump coupled to said engine, said pump further comprising:
- a piston assembly including a piston;
- an eccentric assembly suitable for converting rotary motion of a rotating shaft to rectilinear motion;
- and
- a strap for coupling said eccentric assembly and said piston assembly;
- and
- a pulse hose for absorbing pressure pulsation in the liquid induced by pumping, wherein said strap is suitable for communicating the rectilinear motion of said eccentric assembly to said piston assembly for reciprocating said piston in said cylinder to pump said liquid.
6 more elements
A pressure washer, comprising:
- a frame assembly;
- an engine mounted to said frame assembly;
- and
- a pump mounted to said frame assembly and coupled to said engine, said pump further comprising:
- a pump assembly having at least one piston assembly, said piston assembly driven by said engine for pumping the liquid from a first pressure to a second pressure;
- a head assembly coupled to said pump assembly, said head assembly including an inlet portion suitable for receiving the liquid at the first pressure and an outlet portion suitable for outputting the liquid at the second pressure;
- and
- a valve assembly disposed in said head assembly, said valve being suitable for opening to circulate the liquid within said head assembly from said inlet portion to said outlet portion as said pump is started and closing to circulate the liquid through said piston assembly once a predetermined rate of flow of the liquid through the pump is achieved.
5 more elements
A pump for pumping a liquid, comprising
- a pump housing;
- a head assembly coupled to the pump housing,
- a cylinder being formed in the pump housing and head assembly;
- a piston assembly disposed in the cylinder, the piston assembly including a piston capable
- of reciprocating within the cylinder;
- a pressure unloader valve;
- an eccentric assembly suitable for converting rotary motion of a rotating shaft to rectilinear motion;
- and
- a strap for coupling the eccentric assembly and the piston assembly;
- wherein the strap is suitable for communicating the rectilinear motion of the eccentric assembly to the piston assembly for reciprocating the piston in the cylinder to pump the liquid.
7 more elements
Dependencies are inferred from the claim text.