EP1829622B1 - Couvercle de protection de moteur - Google Patents

Couvercle de protection de moteur Download PDF

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Publication number
EP1829622B1
EP1829622B1 EP07250884A EP07250884A EP1829622B1 EP 1829622 B1 EP1829622 B1 EP 1829622B1 EP 07250884 A EP07250884 A EP 07250884A EP 07250884 A EP07250884 A EP 07250884A EP 1829622 B1 EP1829622 B1 EP 1829622B1
Authority
EP
European Patent Office
Prior art keywords
shroud
engine
pressure washer
frame
pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP07250884A
Other languages
German (de)
English (en)
Other versions
EP1829622A3 (fr
EP1829622A2 (fr
Inventor
Klaus Karl Hahn
Clinton Charles Thackery
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Techtronic Industries Co Ltd
Original Assignee
Techtronic Industries Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
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Application filed by Techtronic Industries Co Ltd filed Critical Techtronic Industries Co Ltd
Publication of EP1829622A2 publication Critical patent/EP1829622A2/fr
Publication of EP1829622A3 publication Critical patent/EP1829622A3/fr
Application granted granted Critical
Publication of EP1829622B1 publication Critical patent/EP1829622B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B08B3/026—Cleaning by making use of hand-held spray guns; Fluid preparations therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B2203/00—Details of cleaning machines or methods involving the use or presence of liquid or steam
    • B08B2203/02—Details of machines or methods for cleaning by the force of jets or sprays
    • B08B2203/0211—Case coverings

Definitions

  • the present invention relates to portable machines with fuel powered engines, and specifically to portable pressure washers with fuel powered engines.
  • One side effect of using a fuel powered engine to operate a pressure washer is that the engine generates a significant amount of heat during operation due to the combustion process. This generated heat causes the engine's exterior surfaces to become extremely hot during operation such that a user could easily become burned if directly contacting an exposed engine surface.
  • Prior art pressure washers have used various covers or shrouds to enclose the engine to prevent users from contacting the engine. Because the covers are generally attached directly to the surface of the engine, the cover must be manufactured from a material with specific properties that allow the cover to accept the significant amount of heat transferred to it from the engine, or in the alternative, the dimensions of the cover (i.e. the thickness of the cover) must be such that the cover can accept the amount of heat generated and transferred to the cover.
  • covers for pressure washers must be robust enough to accept a significant amount of heat from an engine, it is often a design challenge to provide structures or components to store external tools that may be used with the pressure washer.
  • Many current pressure washers have been designed to include a plurality of clips, rings, or other structures to retain external tools for use with the pressure washer, such as lances, spray guns, cords, nozzles, etc.
  • the structures provided to store these tools is often attached to the handle, the cart, or other working parts of the pressure washer. Storing external components on these portions of the pressure washer makes the pressure washer bulkier and less maneuverable with the external tools installed than many users would prefer.
  • shrouds that are directly mounted to an engine receive a portion or percentage of any vibrations created by the engine or pump during operation.
  • Any external tools that are attached to the shroud receive any vibrations within the shroud and may become at least partially unstable with respect to the shroud during pressure washer operation. This unstable connection could lead to failure or breakage of the structures used to removeably accept the external tools, which reduces the operability and convenience of operating the pressure washer.
  • the relative movement between the vibrating shroud and the external tools during operation (because the external tools do not vibrate with the same harmonic frequency as the shroud because of their inertia) may create additional unpleasant noise, which often serves as a distraction and an annoyance to the user.
  • Document DE 19623880 discloses a pressure washer whereby the cover is mounted to the frame using bolts independtly from motor and pump.
  • a pressure washer includes an engine that is operatively connected to a pump.
  • Each of the engine and the pump are supported on a frame.
  • a shroud is mounted to the frame independently of the engine and the pump wherein the shroud at least partially surrounds and encloses a portion of the engine.
  • the invention provides a pressure washer comprising (a) an engine that is operatively connected to a pump, (b) a frame that supports each of the engine and the pump; and (c) a shroud mounted to the frame independently of the engine and the pump, wherein the shroud at least partially encloses the engine, and is mounted to the frame with at least one dampener to limit vibrations generated by the pump and the engine.
  • the shroud may further comprise a plurality of vents to define an air flow passage to and from the engine.
  • the shroud may be of plastic, and the dampeners of rubber, with the shroud mounted to the frame at discrete locations.
  • the engine and pump may also be mounted to the frame with at least one dampener to limit vibrations transferred to the frame.
  • the shroud may comprise at least one retainer to receive and support tools for use with the pressure washer, which may be integrally formed with the shroud, or separately formed.
  • the shroud substantially encloses the engine and pump. Moreover, the shroud may be arranged to not contact the engine or the pump when attached to the frame.
  • FIG. 1 is a perspective view of a pressure washer of the present invention.
  • FIG. 2 is the perspective view of FIG. 1 showing the pressure washer without the external tools attached to the shroud.
  • FIG. 3 is a perspective exploded view of the shroud and external tools.
  • FIG. 4 is a right side view of the pressure washer of FIG. 1 .
  • FIG. 5 is a front side view of the pressure washer of FIG. 1 .
  • FIG. 6 is a top view of the pressure washer of FIG. 1 .
  • FIG. 7 is a back view of the pressure washer of FIG. 1 .
  • FIG. 8 is a perspective view of a second embodiment of the pressure washer of the present invention.
  • FIG. 9 is an exploded view of the pressure washer of FIG. 8 .
  • a shroud for a machine is provided.
  • the shroud described below can be implemented with a multitude of different types of machines that include engines to operate a working member to perform a specific task. Additionally, the shroud described below may be implemented on various machines that include fuel powered engines, such as pressure washers, generators, or air compressors. Although the invention may be implemented with a variety of different types of machines, the design is fully described with specific references to use in a pressure washer. For the sake of brevity we do not fully describe the use of this concept with other types of machines although one of skill in the art, after fully reviewing the specification and drawings herein, will comprehend that this disclosure may successfully be implemented with other types of machines.
  • a pressure washer 10 is provided.
  • the pressure washer 10 is used to receive liquid at a relatively low pressure and raise the pressure using a pump 46, or similar device, until the liquid pressure is such that the liquid may be projected from a spray gun 92, or similar device, at a high rate of speed and pressure.
  • the liquid projected from the pressure washer 10 may be used for various operations.
  • pressure washers are located on a wheeled cart or other movable apparatus to allow the pressure washer to be transported to remote locations for use.
  • the pump 46 on a pressure washer is often operated by a fuel powered engine 40 that includes a rotating drive shaft that is coupled with the pump 46 to rotate a pump impeller (not shown).
  • the fuel powered engine 40 may be an internal combustion engine.
  • a fuel powered engine generates a large amount of heat during operation due to fuel combustion.
  • engines are provided with mechanisms for cooling, such as fins 42 and air flow (whether forced or natural circulation) past the external surfaces of the engine, these cooling mechanisms are not normally efficient enough to prevent the exterior surfaces of the engine 40 from dramatically increasing in temperature during engine operation. Accordingly, because the engine 40 is at an increased temperature during operation, the excess heat present on the exterior surfaces of the engine is transferred to neighboring components due to radiation and convection heat transfer, and transferred to components that are in contact with the engine surface due to conduction heat transfer. Therefore, components of the pressure washer that are in contact with or simply in close proximity to the engine 40 experience a significant amount of heat from the engine 40 during operation and accordingly reach higher temperatures during engine operation.
  • the engine 40 and associated components such as the fuel tank 14 and the pump 46 are normally rigidly mounted on the frame 60.
  • the frame 40 additionally serves as the mounting point for a pair of wheels 12, a plurality of stops 13, a handle 14, and a shroud or cover 50.
  • the wheels 12 may be mounted independently of each other to the frame, or in other embodiments, the wheels may rotate together on an axle (not shown) that is rotatably mounted to the frame 60.
  • the handle 14 serves as the structure to manipulate when moving the pressure washer 10.
  • the frame 60 may be formed from metal and may preferably be formed with hollow metal tubing for high suitable strength but limited weight and material requirements. As shown in the figures, the frame 60 includes a vertical rear section 62, a bottom section 63, and a top section 64.
  • the rear section 62 includes two vertical posts 62a and a horizontal cross-member 62b ( FIG. 7 ).
  • the wheels 12 rotate about axles that are rotatably mounted to each of the vertical posts 62a.
  • the rear section 62 additionally includes a handle 14 that is collapsible into the vertical posts 62a and can be locked in the extended position shown in the figures with a knob 14b on each vertical post 62a.
  • the bottom section 63 includes two arms 63a, each extending from a respective one of the vertical posts 62a.
  • the bottom section 63 additionally includes a front cross-member 63b that connects the two arms 63a and is at substantially the same height as the cross-member 62b of the rear section 62.
  • the top section 64 includes two arms 64a that extend from one of the two vertical posts 62a of the rear section 62.
  • the arms 64a extend substantially perpendicularly from the vertical posts 62a and curve slightly downward as they project toward the front end of the machine.
  • the two arms 64a are connected at the front end with a cross-member 64b.
  • a mounting plate 65 may be attached to the cross-member 62b of the rear section and the cross-member 63b of the bottom section 63.
  • the mounting plate 65 accepts and stabilizes the engine 40 above the mounting plate (and below the top section 64 of the frame 60) and includes an aperture (not shown) to operatively connect the pump 46 with the engine 40.
  • the pump 46 extends from the engine 40 below the mounting plate 65a.
  • the mounting plate 65 is mounted to the frame 60 with a plurality of fasteners 66. Additionally, the forward and rear ends 65a, 65b ( FIG. 7 ) of the mounting plate 65 are curved to match the curvature of the frame 60 for a stable connection.
  • dampening material such as rubber, may be positioned between the mounting plate 65 and the frame 60 to attenuate any vibrations present in the mounting plate 65 from the engine 40 or pump 46 to reduce their transfer to the frame. Additionally, the dampening material may have a relatively high thermal conductivity to substantially prevent heat in the mounting plate 65 from transferring to the frame 60 through conduction.
  • the shroud 50 is mounted to the frame 60 independently of the engine 40 and the pump 46.
  • the shroud 50 is provided on the pressure washer 10 to at least partially enclose the engine 40 to provide a protective barrier against accidental contact with the engine 40 during operation that could lead to burns or other injuries.
  • the shroud 50 is located above the engine 40 and is mounted to the frame 60.
  • the shroud 50 is mounted directly to the frame 60 and does not contact the engine 40 or any associated components. As can be understood by those of ordinary skill in the art, because there is no direct connection contact between the engine 40 and the shroud 50, there is no direct path for conduction heat transfer between the two components. This significantly reduces the amount of heat that can be transferred to the shroud 50, and accordingly reduces the maximum temperature of the shroud during pressure washer 10 operations.
  • the shroud 50 may be mounted to the frame 60 at multiple locations to increase the stability of the shroud 60. As best shown in FIG. 2 , the shroud 50 has a plurality of extending flanges 58 that provide the connection with the frame 60. As shown, the flanges 58 may have a curved bottom surface or profile to closely contact the curved frame 60. Each flange 58 has an aperture 58a ( FIG. 3 ) to accept a fastener for insertion into a corresponding hole in the frame 60.
  • a dampener 62 such as a layer of rubber or other similar material, may be provided between the frame 60 and the shroud 50 at each mounting location. This dampener 62 attenuates or substantially prevents the transfer of heat from the frame 60 to the shroud 50 (and vice versa), and also substantially prevents the transfer of any vibrations that may be present in the frame 60 from transferring to the shroud 50 (and vice versa).
  • the shroud 50 can be designed and manufactured with a broader range of shapes, sizes, and materials than would be possible if the shroud 50 reached higher temperatures during pressure washer 10 operation or if the shroud 50 was subject to vibrations of a larger magnitude.
  • the shroud 50 may include a plurality of receptacles 56 to accept and retain tools for use with the pressure washer 10.
  • the shroud 50 may include a hole 55a for receiving a spray gun 92, a receptacle 56a for a lance 94, and a plurality of receptacles 56c to receive spray nozzles 96.
  • the spray gun 92 may include a projection 92a that may be inserted into the hole 55a in the shroud to connect the spray gun 92 to the shroud 50.
  • a receptacle 56a may be provided that includes a plurality of fingers 56b to retain the lance 94.
  • the spray gun 92 can be retained by the shroud 50 using a similar receptacle 56a as shown in FIG. 3 .
  • the receptacle 56a may be threaded or otherwise inserted into a second hole 55a in the shroud, or in other embodiments the fingers 56b of the receptacle may be monolithically formed with the shroud 50.
  • a plate 54 may be provided to hold a plurality of nozzles 96.
  • the plate 54 includes a plurality of holes 54a that receive the male ends of the nozzles 96 and a plurality of retaining apertures 54b that are engageable with fingers 53 on the shroud 50 to retain the plate 54 on the shroud 50.
  • the plate 54 is easily and quickly removable from the shroud 50 for convenient use at the worksite.
  • the plate 54 may be monolithically formed with the shroud 50.
  • the shroud 50 may include additional or alternate receptacles 56 for other tools or components for use with the pressure washer 10, or another type of machine that uses a similar shroud 50.
  • the receptacles 56 may be integrally formed with the shroud 50, or may be attached to the shroud 50 after the shroud 50 is formed.
  • the shroud 50 may be formed from various materials.
  • the shroud 50 may be formed from plastic and integrally mounted in a single piece.
  • the shrouds 50 that are manufactured from plastic may be conveniently and inexpensively molded as a single component in the desired shape.
  • plastic has a relatively low thermal conductivity.
  • plastic can be molded to be relatively elastic, which is useful for receptacles 56 that receive some of the pressure washer tools.
  • the receptacles 56a for receiving the lance 94 may be formed from opposing arms 56b that partially surround the outer volume of a portion of the tool when positioned within the arms 56b.
  • the arms 56b of the receptacles 56a must be sufficiently flexible because they are biased away from each other to insert the tool into the receptacle 56a and return to their normal orientation when the tool is fully inserted within the receptacle 56a.
  • the shroud 50 may be formed from metal or other acceptable materials.
  • the shroud may include a plurality of vents 70 to allow air flow through the shroud 50 to interact with the engine 40.
  • the vents 70 formed on the shroud 50 may be positioned to allow inlet and exhaust air to flow to and from the engine in conjunction with the combustion process. Additionally, vents 70 may be used to allow air flow past the engine 40 during operation (either by natural or forced air circulation) to remove heat by convection.
  • the vents 70 can be integrally formed in the shroud 50 when formed as a molded plastic piece. Alternatively, the vents 70 can be formed in the shroud 50 after the initial formation of the shroud 50 in an independent step for shrouds 50 that are formed from metal or another similar material.
  • FIGs. 8 and 9 A second representative embodiment of the machine is shown in FIGs. 8 and 9 . Specifically, these figures show a second pressure washer 100.
  • the pressure washer 100 includes all of the components discussed with respect to the first embodiment above, but substantially encloses the motor 140 ( FIG. 9 ) and the pump (not shown) with a shroud or cover 150.
  • the shroud 150 is formed from multiple pieces, a front member 151, right and left sides 152, 153, a top member 154, and a rear member 155. As shown in the exploded view of FIG. 9 , the left and right sides 152, 153 are attached to the frame 160 with fasteners 180 that are inserted through holes in the shroud members and into holes 161 in the frame. The top and rear members 154, 155 are mounted to the left and right sides 152, 153 after they are mounted to the frame 160. The front member 151 is mounted to a front cross-member 164 of the frame 160 and is kept rigidly mounted to the pressure washer with the left and right sides 152, 153.
  • the shroud is mounted to the frame 160 and does not contact the engine 140 or the pump. Therefore, the pressure washer of this embodiment includes the advantages of the previous embodiment. Specifically, there is no path for direct conduction heat transfer between the engine 140 and the shroud 150. Additionally, because the shroud 150 is not directly attached to the engine 140, vibrations are not directly transferred to the shroud, which allows for quieter and more stable operation of the pressure washer. As with the embodiment above, in this embodiment, a dampening material may be positioned between the frame and the sides of the shroud 150 to attenuate the transfer from any vibrations in the frame to the shroud 150.
  • the shroud 150 may include a plurality of structures 156 for receiving tools for use with the pressure washer 100. Specifically, the shroud may receive a spray gun 92 and a lance 94 as well as a plurality of nozzles 96. Additionally, the shroud 150 includes a plurality of vents 170 along the sides and top of the shroud 150 to allow air flow past the engine 140 (that is substantially enclosed within the shroud 150) for cooling as well as air flow for use with the combustion process.

Landscapes

  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Body Structure For Vehicles (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Claims (11)

  1. Laveuse à pression (10), comprenant :
    (a) un moteur (40) connecté en opération à une pompe (46) ;
    (b) un cadre (60) supportant aussi bien le moteur que la pompe ; et
    (c) un cache (50) monté sur le cadre indépendamment du moteur et de la pompe, le cache renfermant au moins partiellement le moteur, caractérisée en ce qu'elle est montée sur le cadre avec au moins un amortisseur (62) pour limiter les vibrations générées par la pompe et par le moteur.
  2. Laveuse à pression selon la revendication 1, dans laquelle le cache renferme substantiellement le moteur et la pompe.
  3. Laveuse à pression selon la revendication 1 ou 2, dans laquelle le cache comprend en outre une pluralité d'évents définissant un passage d'écoulement d'air vers et à partir du moteur.
  4. Laveuse à pression selon l'une quelconque des revendications précédentes, dans laquelle les amortisseurs sont du caoutchouc.
  5. Laveuse à pression selon l'une quelconque des revendications précédentes, dans laquelle le cache est du plastique.
  6. Laveuse à pression selon l'une quelconque des revendications précédentes, dans laquelle le cache est monté sur le cadre au niveau d'une pluralité de positions distinctes.
  7. Laveuse à pression selon l'une quelconque des revendications précédentes, dans laquelle le moteur et la pompe sont chacun montés sur le cadre avec au moins un amortisseur pour limiter les vibrations transmises au cadre.
  8. Laveuse à pression selon l'une quelconque des revendications précédentes, dans laquelle le cache comprend en outre au moins un dispositif de retenue (56) pour recevoir et supporter des outils pour une utilisation conjointe avec la laveuse à pression.
  9. Laveuse à pression selon la revendication 8, dans laquelle le au moins un dispositif de retenue est formé intégralement avec le cache.
  10. laveuse à pression selon la revendication 8, dans laquelle le au moins un dispositif de retenue est formé séparément du cache et relié au cache.
  11. laveuse à pression selon l'une quelconque des revendications précédentes, dans laquelle le cache n'est pas en contact avec le moteur ou la pompe lorsque ce premier est attaché au cadre.
EP07250884A 2006-03-03 2007-03-02 Couvercle de protection de moteur Not-in-force EP1829622B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/367,117 US20070207042A1 (en) 2006-03-03 2006-03-03 Engine shroud

Publications (3)

Publication Number Publication Date
EP1829622A2 EP1829622A2 (fr) 2007-09-05
EP1829622A3 EP1829622A3 (fr) 2007-09-12
EP1829622B1 true EP1829622B1 (fr) 2011-11-30

Family

ID=38226507

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07250884A Not-in-force EP1829622B1 (fr) 2006-03-03 2007-03-02 Couvercle de protection de moteur

Country Status (5)

Country Link
US (1) US20070207042A1 (fr)
EP (1) EP1829622B1 (fr)
CN (1) CN101028623A (fr)
AT (1) ATE535318T1 (fr)
AU (1) AU2007200614A1 (fr)

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US6581579B1 (en) * 2002-06-19 2003-06-24 Walbro Engine Management, L.L.C. Vapor separator for a fuel pump assembly
US6892957B2 (en) * 2002-08-29 2005-05-17 Black & Decker Inc. Pressure washer with improved mobility
USD490948S1 (en) * 2002-11-11 2004-06-01 Interpump Cleaning S.P.A. Divisione Faip Washing high pressure equipment
US20040226584A1 (en) * 2003-05-14 2004-11-18 Michael Guest Multifunctional surface cleaning machine and method of using the same
USD499848S1 (en) * 2003-12-23 2004-12-14 Devilbiss Air Power Company Pressure washer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023156094A1 (fr) * 2022-02-15 2023-08-24 Alfred Kärcher SE & Co. KG Dispositif de nettoyage haute pression

Also Published As

Publication number Publication date
CN101028623A (zh) 2007-09-05
EP1829622A3 (fr) 2007-09-12
EP1829622A2 (fr) 2007-09-05
AU2007200614A1 (en) 2007-09-20
US20070207042A1 (en) 2007-09-06
ATE535318T1 (de) 2011-12-15

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