US7125228B2 — Pressure washer having oilless high pressure pump

Claim 1

Independent Claim 99 words

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.

Claim 2

Dependent Claim 99 words

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.

Claim 3

Dependent Claim 60 words

The pressure washer as claimed in claim 1 , wherein said eccentric assembly comprises: a shaft suitable for being coupled to a drive shaft of an engine; at least one bearing assembly for supporting said shaft in said pump housing so that said shaft may rotate; and an eccentric for converting the rotary motion of said shaft to rectilinear motion.

Claim 4

Dependent Claim 29 words

The pressure washer as claimed in claim 2 , wherein said eccentric assembly further comprises a counterweight assembly coupled to said shaft for counterbalancing movement of said piston assembly.

Claim 5

Dependent Claim 14 words

The pressure washer as claimed in claim 1 , wherein said strap is flexible.

Claim 6

Dependent Claim 30 words

The pressure washer as claimed in claim 1 , wherein each piston assembly further comprises a strap coupling member and clamping block for coupling said piston assembly to said strap.

Claim 7

Dependent Claim 21 words

The pressure washer as claimed in claim 1 , wherein said piston is formed of one of ceramic and nitrated steel.

Claim 8

Dependent Claim 21 words

The pressure washer as claimed in claim 1 , further comprising a head assembly for porting said liquid through said pump.

Claim 9

Dependent Claim 20 words

The pressure washer as claimed in claim 1 , further comprising a pulse hose retainer for retaining said pulse hose.

Claim 10

Dependent Claim 50 words

The pressure washer as claimed in claim 8 , wherein the pulse hose retainer comprises a body having a first aperture and a second aperture, the first aperture being suitable for receiving said pulse hose, and the second aperture being suitable for securing said pulse hose retainer to said frame.

Claim 11

Dependent Claim 156 words

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.

Claim 12

Dependent Claim 156 words

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.

Claim 13

Dependent Claim 29 words

The pressure washer as claimed in claim 10 , wherein said head assembly includes a formed valve body having a pen from said inlet portion to said outlet portion.

Claim 14

Dependent Claim 87 words

The pressure washer as claimed in claim 11 , wherein said valve assembly includes a ball, a ball seat, and a spring, wherein said ball is held away from said ball seat by said spring as said pump is started opening said port and allowing circulation of the liquid between said inlet pardon and said outlet portion, and wherein the liquid forces said ball against said ball seat overcoming said spring to at least partially block said port once the predetermined flow of the liquid is achieved.

Claim 15

Dependent Claim 18 words

The pressure washer as claimed in claim 12 , further comprising a plug for closing said valve body.

Claim 16

Dependent Claim 68 words

The pressure washer as claimed in claim 10 , further comprising: an eccentric assembly suitable for converting rotary motion of a rotating shaft of the engine to rectilinear motion; and a flexible strap for coupling said eccentric assembly and said piston assembly; wherein said strap is suitable for communicating the rectilinear motion of said eccentric assembly to said piston assembly for reciprocating said piston to pump said liquid.

Claim 17

Dependent Claim 60 words

The pressure washer as claimed in claim 14 , wherein said eccentric assembly comprises: a shaft suitable for being coupled to the drive shaft of an engine; at least one bearing assembly for supporting said shaft in said pump assembly so that said shaft may rotate; and an eccentric for converting the rotary motion of said shaft to rectilinear motion.

Claim 18

Dependent Claim 20 words

The pressure washer as claimed in claim 15 , wherein said at least one bearing assembly comprises a sealed bearing.

Claim 19

Dependent Claim 27 words

The pressure washer as claimed in claim 15 , wherein said eccentric assembly further comprises a counterweight assembly coupled to said shaft for counterbalancing said piston assembly.

Claim 20

Dependent Claim 27 words

The pressure washer as claimed in claim 14 , wherein the strap is shaped so that loads within the strap are distributed substantially uniformly throughout the strap.

Claim 21

Dependent Claim 108 words

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.

Claim 22

Dependent Claim 108 words

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.

Claim 23

Dependent Claim 59 words

The pump as claimed in claim 19 , wherein the eccentric assembly comprises: a shaft suitable for being coupled to a drive shaft of an engine; at least one bearing assembly for supporting the shaft in the pump housing so that the shaft may rotate; and an eccentric for converting the rotary motion of the shaft to rectilinear motion.

Claim 24

Dependent Claim 26 words

The pump as claimed in claim 20 , wherein the eccentric assembly further comprises a counterweight assembly coupled to the shaft for counterbalancing the piston assembly.

Claim 25

Dependent Claim 25 words

The pump as claimed in claim 19 , wherein the piston assembly further comprises a strap coupling assembly for coupling the piston to the strap.

Claim 26

Dependent Claim 19 words

The pump as claimed in claim 19 , wherein the head assembly includes a port for porting the liquid.

Claim 27

Dependent Claim 93 words

The pump as claimed in claim 19 , wherein the pressure unloader valve comprises: a valve body having a high pressure port and a low pressure part; a ball valve assembly received in the valve body, the ball valve assembly including a ball, a ball seat disposed against the high pressure port, a spring suitable for biasing the ball against the ball seat; and a plug received in the valve body, wherein the plug is threaded into the valve body for controlling the amount of bias placed on the ball by the spring.

Claim 28

Dependent Claim 32 words

The pump as claimed in claim 24 , wherein the ball seat includes a restriction portion in which the ball floats for at to at least partially reduce surging of the pump.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2009-10-23	2010-04-24	2010-10-24	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2013-10-23	2014-04-24	2014-10-24	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2017-10-23	2018-04-24	2018-10-24	$7700.00	Window Closed / Lapsed

Pressure washer having oilless high pressure pump

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