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EP3907010A1 - Drahtloser variabler druckzerstäuber und verfahren - Google Patents

Drahtloser variabler druckzerstäuber und verfahren Download PDF

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Publication number
EP3907010A1
EP3907010A1 EP21171956.2A EP21171956A EP3907010A1 EP 3907010 A1 EP3907010 A1 EP 3907010A1 EP 21171956 A EP21171956 A EP 21171956A EP 3907010 A1 EP3907010 A1 EP 3907010A1
Authority
EP
European Patent Office
Prior art keywords
pump
liquid
flow rate
spray gun
pressure
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.)
Withdrawn
Application number
EP21171956.2A
Other languages
English (en)
French (fr)
Inventor
Joseph J. Gustafson
Steven Norris
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.)
Wessol LLC
Original Assignee
Wessol LLC
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
Priority claimed from US17/245,571 external-priority patent/US20220134369A1/en
Application filed by Wessol LLC filed Critical Wessol LLC
Publication of EP3907010A1 publication Critical patent/EP3907010A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/085—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to flow or pressure of liquid or other fluent material to be discharged
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/06—Mobile combinations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • F04B23/025—Pumping installations or systems having reservoirs the pump being located directly adjacent the reservoir
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/002—Manually-actuated controlling means, e.g. push buttons, levers or triggers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0201—Current
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/05—Pressure after the pump outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/09—Flow through the pump

Definitions

  • variable pressure and/or flow rate sprayer that uses a signal from a spray gun to vary the pressure and/or flow rate with which a liquid is dispensed from the sprayer.
  • a variable pressure and/or flow rate sprayer is hereinafter also referred to as variable pressure sprayer.
  • two-speed is considered to be comprised in the term variable speed.
  • Prior art sprayers work on the principle that when the user opens a sprayer nozzle through a trigger mechanism, the pressure in the system drops and a pressure switch built into a pump senses the pressure drop and closes a switch turning a pump motor on and thus the sprayer to start spraying. When the user closes the spray nozzle by releasing the trigger mechanism the pressure switch senses the pressure increase and opens a set of contacts causing the pump motor to turn off.
  • an electrical switch mounted in the spray gun may be used to control the operation of the motor operated liquid pump. Wires are then necessary to control the operation of the sprayer and may be damaged during normal use, rendering the sprayer inoperable.
  • One such example is U.S. Patent Publication No. 2019/0263363 .
  • the switch When the user opens the gun valve the switch also actuates a microswitch turning on the pump. The pump runs continuously until the user closes the valve, causing the microswitch to open and shut off the pump.
  • This design requires control wires to be run from the sprayer unit to the gun via the system's hose. The control wires then must be protected from the environment by re-wrapping the hose with a protective coating. The control wires are still susceptible to damage from field conditions that can nick or cut the wires.
  • the pump in the sprayer is controlled wirelessly, for example by putting a module in the spray gun that sends a wireless signal to a receiver in the spray gun directing the pump to start.
  • This wireless signal can then be used not only to turn the unit on and off, but may also be used to let the user control the speed of the pump, thus controlling the output pressure and/or flow rate.
  • the signal can also be used for feedback such that the user can "set" the desired pressure and/or flow rate and let the pump speed change according to flow such that the desired pressure and/or flow rate is constant.
  • a wireless power sprayer is provided that is capable of dispensing a liquid from the supply tank at varying pressures and/or flow rates.
  • a wireless power sprayer is provided that is controlled wirelessly by providing a transmitter in a spray gun that sends a wireless signal to a receiver activating a pump that delivers liquid from a storage tank to the spray gun.
  • a wireless power sprayer uses a speed control to vary the pressure and/or flow with which a liquid is dispensed from the pump.
  • a wireless power sprayer is provided with a trigger on the spray gun of the applicator wand that is actuated with an electrical switch, or other electrical circuit capable of sensing trigger actuation and a module that sends the wireless signal to the receiver for activating the pump.
  • a method of operating a wireless variable pressure sprayer uses a speed controller to vary the pressure and/or flow rate with which a liquid is dispensed from the sprayer.
  • the current invention aims to provide a variable pressure and/or flow rate sprayer that takes away, or at least alleviates the above-identified shortcomings of prior art sprayers. According to the invention this is accomplished by providing a wireless variable pressure sprayer that includes a housing in which is mounted a battery, a battery-operated motor, a motor-operated liquid pump, and a speed controller module capable of receiving a wireless signal. A tank is provided and communicates with the pump for holding a supply of liquid. A user operable spray gun is connected for liquid flow communication from the tank.
  • a wireless transmitter is positioned in the spray gun and adapted to transmit a wireless signal to a receiver/controller positioned proximate to the battery and motor-operated liquid pump, adapted for supplying current from the battery to the motor sufficient to cause the motor operated liquid pump to deliver liquid through the spray gun and into an applicator wand.
  • a liquid outlet from the pump includes a connector adapted to receive a hose that may be comprised in the variable pressure s prayer.
  • an applicator wand is provided and is adapted for connection to the spray gun and hose for directing fluid under pressure to a desired target.
  • the spray gun including a trigger, is positioned on the applicator wand and adapted to wirelessly transmit a signal indicating the pressure and/or flow rate of the liquid to be delivered from the pump to the spray gun.
  • a variable pressure and/or flow rate controller is positioned on the housing and connected to the motor for varying an output pressure and/or flow percentage of the pump.
  • the battery supplies a suitable voltage, for example, 18 V direct current, to the motor that powers the pump, the pump is adapted to draw liquid from the tank through a pump input conduit, the pump pressurizes the liquid, and discharges the liquid into an output conduit that is connected through a sidewall of the housing to the hose.
  • a suitable voltage for example, 18 V direct current
  • the wireless variable pressure sprayer is adapted to supply liquid at a manually selectable high or low pressure.
  • the wireless variable pressure sprayer is adapted to supply liquid at a manually selectable high or low flow rate.
  • the pump is controlled wirelessly via a signal transmitted from the spray gun to a signal receiver operatively associated with the motor indicative of an instruction to the pump to turn on.
  • the spray gun is adapted for manual operation by a user wirelessly controlling the output pressure and/or flow rate of the liquid by operation of the spray gun.
  • a pressure transducer or flow meter is placed at the output of the motor operated liquid pump, the signal is adapted for being fed back to the electronic control module whereby the user can manually set a desired pressure and/or flow rate and the pump speed changes according to pressure and/or flow rate as determined by the pressure transducer or flow meter such that the desired pressure and/or flow rate is constant.
  • the trigger is provided with two positions correlated to the desired pressure, and a demand for high or low pressure causes a wireless signal to be transmitted from the electronic control module to a receiver/controller on the motor to transmit current from the battery to the motor sufficient to cause the pump to deliver the desired pressure and/or flow of liquid through the hose, the spray gun and into the applicator wand.
  • the trigger includes a switch that when switched on, causes the transmitter in the spray gun to transmit a signal correlated to a specific desired pressure within a predetermined range of pressures and/or flow rate.
  • a method of providing a liquid at a variable pressure to an applicator wand includes the steps of providing a housing on which is mounted a battery, a battery-operated motor, and a motor-operated liquid pump, a tank communicating with the pump for holding a supply of liquid and a spray gun connected for liquid flow communication from the tank.
  • a wireless transmitter may be positioned in the spray gun and adapted to transmit a wireless signal to a receiver/controller, signaling the battery to transmit current from the battery to the motor operated pump sufficient to cause the pump to deliver liquid through the spray gun and into the applicator wand to wirelessly control the output pressure of the liquid by operation of the spray gun.
  • the method includes the step of supplying liquid at a manually selectable high or low pressure.
  • the method includes the step of supplying liquid at a manually selectable high or low flow rate.
  • the method includes the step of feeding back a pressure and/or flow rate signal to the electronic control module whereby the user can manually set a desired pressure and/or flow rate and the pump speed changes such that the desired pressure and/or flow rate is constant.
  • the method includes the step of transmitting a wireless signal correlated to a specific desired pressure and/or flow within a predetermined range of pressures and/or flows to the pump, determined by a position of the trigger that is correlated to predetermined range of pressures.
  • a wireless transmitter is positioned in the spray gun and adapted to transmit a wireless signal to a receiver/controller, signaling the battery to transmit current from the battery to the motor sufficient to operate the motor operated pump to cause the pump to deliver liquid through the spray gun and into a manually-directed applicator wand at a manually selectable high or low pressure.
  • the wireless signal may be fed back to an electronic control module whereby the user can manually set a desired pressure that changes according to flow such that the desired pressure is constant.
  • the wireless signal may be correlated to a specific desired pressure and/or flow rate within a predetermined range of pressures and/or flow rates to the pump.
  • wireless variable pressure sprayer 10 includes a housing 12 that encloses the operating elements of the sprayer 10.
  • the sprayer 10 may be carried on the back of the user by a shoulder strap assembly, not shown, that is mounted to the back of the housing 12.
  • the sprayer 10 may also be mounted on wheels so that it can be rolled instead of carried.
  • the housing 12 encloses a tank 16 which will typically hold 10-20, preferably 12-18, or 15 liters of liquid.
  • the tank 16 is accessed through a threaded cap 18.
  • a battery 30, such as a lithium ion battery, is mounted on the housing 12. Liquid under pressure is dispensed from the sprayer 10 through a hose 40 that connects to an applicator wand 44.
  • the applicator wand 44 includes a spray gun 46 with a trigger 48 that is manually grasped by the user, and which operates a valve, not shown, in the spray gun 46 that permits the pressure of the liquid to be controlled.
  • a variable pressure controller 50 is mounted externally to the side of the housing 12 and communicates with a controller housing 52 in the lower part of the housing 12.
  • the battery 30 supplies nominal 18 V current to a motor 54 that drives a pump 56.
  • the pump 56 draws liquid from the tank 16 through a pump input conduit that pressurizes the liquid and discharges it into an output conduit 60 that is connected through the sidewall of the housing 12 to the discharge hose 40.
  • the sprayer is manually set to ether a high or low pressure and/or flow rate.
  • the pump 56 in the sprayer 10 is controlled wirelessly by a module in the spray gun 46 that sends a wireless signal to a receiver in the spray gun 46 signaling it to turn on. This eliminates the need for a pressure switch on the pump 56, and control wires wrapped on the hose 40. This wireless signal can then be used not only to turn the unit on and off, but also to let the user control the speed of the pump, thus controlling the output pressure and/or flow rate.
  • Demand Signal this may be depressing the trigger 48.
  • a demand for high pressure or flow rate causes a wireless signal to be transmitted from a transmitter to a receiver/controller, signaling the motor 54 to operate at a set high speed determined by the current and voltage supplied by the controller.
  • the high motor speed causes the pump 56 to deliver liquid at a high pressure and/or flow rate of liquid through the hose 40, through the spray gun 46 and into the wand 44.
  • a demand for low pressure or flow rate causes a wireless signal to be transmitted from a transmitter to a receiver/controller, signaling the motor 54 to operate at a set low speed determined by the current and voltage supplied by the controller.
  • the low motor speed causes the pump 56 to deliver liquid at a low pressure and/or flow rate through the hose 40, through the spray gun 46 and into the wand 44.
  • a further demand signal from the transmitter either signals the receiver/controller to continue pumping at either high or low pressure or flow rate, or to turn off power to the pump 56.
  • the sprayer 10 has a master ON/OFF switch.
  • the trigger 48 of the spray gun 46 when depressed, causes the transmitter in spray gun 46 to transmit a signal correlated to a specific pressure and/or flow rate within the permitted range of pressures.
  • a wireless signal is to be transmitted from the transmitter to a receiver/controller, signaling the motor 54 to operate the pump 56 sufficient to cause the pump 56 to deliver liquid at the specified pressure and/or flow rate liquid through the hose 40, through the spray gun 46 and into the wand 44.
  • variable speed controller such as a rotatable dial or user operable display, may be positioned on the spray gun 46 to allow the user to change the signal the transmitter emits and thus changing the pressure and/or flow rate of the liquid to be delivered to the wand 44.
  • the user may increment or decrement the pump speed. With a demand signal from the user a signal is sent to check system pressure and/or flow. With no demand signal from the user, the power to the pump 56 is turned off.
  • circuit diagrams are provided for two iterations of a wireless sprayer, one having two-speed operation and one with variable speed operation.
  • the spray gun 46 includes a circuit 70 with a two-speed on/off function.
  • the circuit 70 operates in a standby mode until a permanent magnet operated by the trigger 48 is moved by the trigger 48 into proximity of a Hall effect sensor.
  • a microcontroller unit (“MCU") detects the Hall effect sensor signal and transmits via an antenna a wireless signal to command the motor 54 to operate the pump 56 to deliver liquid from the tank 16.
  • the liquid pressure and/or flow rate is user selectable with pump speed switches SW1 and SWII.
  • the circuit 70 is powered by a coin battery, for example, a CR2032 battery. If the battery power falls below a threshold value the MCU triggers the LED flash display to indicate that the battery requires replacement.
  • Tank operation is shown in Figure 6 .
  • Delivery of liquid from the tank 16 is initiated by a wireless signal from the spray gun 46 containing trigger state and selected pressure and/or flow rate.
  • a wireless receiver decodes the signal and sends a data protocol to the MCU to initiate operation of the tank 16.
  • the lithium battery 30 delivers direct current to the DC motor 54 and provides MCU stable power via a linear regulator.
  • the MCU delivers a pulse wave modulated ("PWM") signal to drive a MOSFET according to the selected pressure and/or flow rate determined by the wireless command signal.
  • PWM pulse wave modulated
  • the current sensing resistor monitors the status of the motor 54 to protect against an unwanted stall event.
  • the MCU continually detects the voltage of the battery 30 and automatically shuts down the machine when the voltage drops below a threshold value.
  • a circuit 90 with an ON/OFF function with variable speed control is shown and explained.
  • the circuit operates in a standby mode until a permanent magnet operated by the trigger 48 is moved by the trigger 48 into proximity of a Hall effect sensor.
  • the MCU in the spray gun detects the Hall effect sensor signal and sends a wireless signal via the antenna.
  • the signal contains trigger state and desired pressure and/or flow rate.
  • the signal is received by another MCU located on the housing that produces a signal to command the motor 54 to operate the pump 56 to deliver liquid from the tank 16.
  • the user controls the spray gun 46 by operation of an UP/DOWN switch that changes the wireless command signal-to increase or decrease power delivered to the motor 54 as needed to control output of the pump 56 as desired.
  • the circuit 90 is powered by a coin battery, for example, a CR2032 battery. If the battery power falls below a threshold value the MCU, which includes a built-in LCD driver, triggers the LCD display to indicate that the battery requires replacement.
  • a coin battery for example, a CR2032 battery.
  • a circuit 100 operates the delivery of the liquid from the tank 16. Delivery of liquid from the tank 16 is initiated by a wireless signal from the spray gun 46 which activates operation of the motor 54.
  • a wireless receiver decodes the wireless signal and sends a data protocol to the MCU to execute operation of the pump.
  • the lithium battery 30 delivers direct current to the motor 54 and provides MCU stable power via a linear regulator.
  • the MCU delivers a PWM signal to drive a MOSFET according to the wireless command signal.
  • a pressure and/or flow rate sensor is connected to the pump output and there is a feedback loop within the MCU that automatically adjusts the PWM duty cycle in the motor circuit to achieve the selected pressure and/or flow rate communicated through the wireless command signal from the spray gun.
  • the current sensing resistor monitors the status of the motor 54 to protect against an unwanted stall event.
  • the MCU continually detects the voltage of the battery 30 and automatically shuts down the machine when the voltage drops below a threshold value. In order to save battery power, the pressure sensor and/or flow rate sensor turns on via an MCU command only if the motor 54 is running.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Nozzles (AREA)
EP21171956.2A 2020-05-04 2021-05-04 Drahtloser variabler druckzerstäuber und verfahren Withdrawn EP3907010A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202063019608P 2020-05-04 2020-05-04
US17/245,571 US20220134369A1 (en) 2020-11-04 2021-04-30 Wireless variable pressure sprayer and method

Publications (1)

Publication Number Publication Date
EP3907010A1 true EP3907010A1 (de) 2021-11-10

Family

ID=75801438

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21171956.2A Withdrawn EP3907010A1 (de) 2020-05-04 2021-05-04 Drahtloser variabler druckzerstäuber und verfahren

Country Status (3)

Country Link
EP (1) EP3907010A1 (de)
CA (1) CA3117155A1 (de)
MX (1) MX2021005201A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210107038A1 (en) * 2017-04-18 2021-04-15 Robert Bosch Gmbh Pressurized Cleaning Apparatus Comprising a Pressure Generation Unit

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5381962A (en) * 1992-12-10 1995-01-17 Hydro-Chem Systems, Inc. Remote controlled spraying device
US20080061166A1 (en) * 2002-10-15 2008-03-13 Innovative Cleaning Equipment, Inc. Portable powered foaming sprayer
US20150102121A1 (en) * 2013-10-10 2015-04-16 Briggs & Stratton Corporation Wirelessly controlled trigger start and chemical tank change-over for pressure washers
US20170122304A1 (en) * 2014-06-20 2017-05-04 Hitachi Koki Co., Ltd. Liquid discharge apparatus
US20180071792A1 (en) * 2015-05-21 2018-03-15 Alfred Kärcher Gmbh & Co. Kg High-pressure cleaning system and discharge unit for such a high-pressure cleaning system
WO2019148448A1 (en) * 2018-02-02 2019-08-08 Tti (Macao Commercial Offshore) Limited Electric power sprayer with multi-voltage battery system and method therefor
US20190263363A1 (en) 2018-02-28 2019-08-29 Milwaukee Electric Tool Corporation Inflator with dynamic pressure compensation

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5381962A (en) * 1992-12-10 1995-01-17 Hydro-Chem Systems, Inc. Remote controlled spraying device
US20080061166A1 (en) * 2002-10-15 2008-03-13 Innovative Cleaning Equipment, Inc. Portable powered foaming sprayer
US20150102121A1 (en) * 2013-10-10 2015-04-16 Briggs & Stratton Corporation Wirelessly controlled trigger start and chemical tank change-over for pressure washers
US20170122304A1 (en) * 2014-06-20 2017-05-04 Hitachi Koki Co., Ltd. Liquid discharge apparatus
US20180071792A1 (en) * 2015-05-21 2018-03-15 Alfred Kärcher Gmbh & Co. Kg High-pressure cleaning system and discharge unit for such a high-pressure cleaning system
WO2019148448A1 (en) * 2018-02-02 2019-08-08 Tti (Macao Commercial Offshore) Limited Electric power sprayer with multi-voltage battery system and method therefor
US20190263363A1 (en) 2018-02-28 2019-08-29 Milwaukee Electric Tool Corporation Inflator with dynamic pressure compensation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210107038A1 (en) * 2017-04-18 2021-04-15 Robert Bosch Gmbh Pressurized Cleaning Apparatus Comprising a Pressure Generation Unit
US11577282B2 (en) * 2017-04-18 2023-02-14 Robert Bosch Gmbh Pressurized cleaning apparatus comprising a pressure generation unit

Also Published As

Publication number Publication date
MX2021005201A (es) 2022-04-01
CA3117155A1 (en) 2021-11-04

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