Floor cleaning device and liquid delivery fitting for floor cleaning device

Abstract

A floor cleaning device is disclosed. The device has a cleaning head portion for engaging a floor surface during cleaning, an upright portion for manipulating movement of the cleaning head portion, a liquid delivery fitting, a handle portion extending from the upright portion, and a sealed liquid storage container. The fitting includes a single needle tube defining a first passage for allowing cleaning detergent to travel therethrough from the sealed storage container to the cleaning head portion and a second passage for allowing gas or air to travel from the surroundings to the sealed storage container for pressure equalization, and wherein the needle tube has a non-cylindrical configuration and a flat configuration.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. patent application serial number 18 / 452546 filed on August 20, 2023 and U.S. patent application serial number 18 / 333464 filed on June 12, 2023, which is a partial continuation application of U.S. patent application serial number 117 / 347,478 filed on June 14, 2021, which application serial number 117 / 347,478 claims priority to previously filed UK patent application number 2012186.9 filed on August 5, 2020, and the contents of all previously filed applications are incorporated herein in their entirety. Technical Field

[0003] The present invention relates to a floor cleaning device and a liquid delivery accessory suitable for, but not limited to, use in a floor cleaning device. The present invention also relates to different applications of the liquid delivery accessory. Background Art

[0004] There are a variety of conventional floor cleaning devices. In older generations of such devices, the device will typically provide a cleaning head having a handle connected to the cleaning head. The cleaning head is configured to be mounted with a disposable piece of cleaning fabric for engaging the floor surface during cleaning. If the user wants to use a liquid cleaning detergent to assist in cleaning, he / she will need to use a separate cleaning detergent bottle and spray the liquid cleaning detergent on the floor surface before cleaning the floor with the device. This can be cumbersome.

[0005] Later floor cleaning devices were developed to provide a cleaning fluid container as a part of the device. This type of device is for example provided with a switch or actuator on a handle so that when the switch or actuator is pressed, the cleaning fluid from the container can be mobilized and sprayed on the floor surface in front of the device. Utilize this device, no independent detergent bottle is needed. Although it is desirable to provide a built-in fluid detergent supply unit, the problem of detergent leakage often occurs simultaneously. Other problems include unreliable flow of liquid detergents when desired, complexity of construction and / or volume large, high manufacturing cost, etc.

[0006] The present invention seeks to address these problems, and / or at least provide the public with a useful alternative.The present invention also provides a fluid transfer accessory generally suitable for use in a variety of applications. Summary of the invention

[0007] According to a first aspect of the present invention, there is provided a floor cleaning apparatus comprising: a cleaning head portion for engaging a floor surface during cleaning, an upright portion for manipulating movement of the cleaning head portion, a liquid delivery accessory, a handle portion extending from the upright portion, and a sealed liquid storage container, wherein the cleaning head portion includes at least a first nozzle for discharging a cleaning detergent therefrom, wherein:

[0008] - the liquid delivery fitting defines at least a first channel,

[0009] the liquid delivery fitting comprises a first chamber, the first passage allowing fluid communication between the sealed liquid storage container and the first chamber,

[0010] - a second chamber located adjacent to the first chamber,

[0011] the liquid delivery fitting comprises a first conduit allowing liquid to leave from the second chamber to a first nozzle for discharge, and

[0012] - At least the second chamber comprises a damper for storing pressure when liquid is pumped from the second chamber to the first nozzle and for releasing pressure when liquid is not pumped from the second chamber to the first nozzle.

[0013] Preferably, the damper may be in the form of an elongated tube that expands when absorbing a certain amount of fluid when under elevated internal pressure, for example when liquid is pumped from the second chamber to the first nozzle, and defaults to releasing the amount of liquid when the elongated tube returns to a default configuration when not under elevated internal pressure, i.e. when liquid is not pumped from the second chamber to the first nozzle. The damper may define a closed end and an open end, and be in fluid communication with the second chamber, and may be suspended from or otherwise extend from the second chamber.

[0014] Suitably, the damper may be made of a soft elastic plastic selected from silicone rubber, ethylene propylene diene monomer (EPDM) or thermoplastic polyurethane (TPU).

[0015] Preferably, the floor cleaning device further comprises:

[0016] - a second nozzle, also for discharging the cleaning detergent from the sealed liquid storage container,

[0017] - a single needle cannula defining said first channel and a second channel separate from said first channel,

[0018] - a third chamber located adjacent to the first chamber, the second passage allowing gas communication between the third chamber and the sealed liquid storage container,

[0019] - an inlet that allows ambient air or gas to enter the third chamber and then into the liquid storage container,

[0020] - a fourth chamber located adjacent to the first chamber, and

[0021] - a second duct allowing liquid to leave from the fourth chamber towards the second nozzle for discharge.

[0022] In one embodiment, the first chamber may be provided with a first orifice for fluid communication with the second chamber, and the first orifice may be reciprocally closed by a first one-way valve. The first chamber may be provided with a second orifice for fluid communication with the fourth chamber, and the second orifice may be reciprocally closed by a second one-way valve; the second chamber and the fourth chamber may be provided with a first spring-loaded valve and a second spring-loaded valve, respectively, for minimizing liquid leakage from the first conduit and the second conduit, respectively; and the second chamber and the fourth chamber may be provided with a first plunger and a second plunger, respectively, the first plunger and the second plunger may be operated by a motor, for pumping fluid from the sealed liquid container to the first and second nozzles, respectively, for discharge.

[0023] In one embodiment, the chamber can be provided with a third plunger, which can be operated by the one motor to pump ambient air or gas to the third chamber via the inlet and then to the sealed liquid storage container via the second channel to balance the pressure in the sealed liquid storage container; the inlet can act as a third one-way valve to control the entry of ambient air or gas into the third chamber; and the third chamber can be provided with a fourth one-way valve to control the passage of air or gas from the third chamber to the sealed liquid storage container to balance the pressure in the sealed liquid storage container.

[0024] In a specific embodiment, the liquid delivery accessory may include a fifth chamber, which accommodates the first, second and third pistons and the one motor, and the fifth chamber may include a pivotable plate, which can be moved by the one motor and is used to alternately actuate the first, second and third pistons to produce a pumping action; and the cleaning head portion may not have any check valve for controlling leakage of liquid from the first nozzle and / or the second nozzle when the floor cleaning device is not in use.

[0025] According to a second aspect of the present invention, there is provided a liquid delivery fitting for controlling the flow of liquid from a sealed liquid storage container to at least a first nozzle, wherein:

[0026] – The liquid delivery fitting provides a first channel,

[0027] - the liquid delivery fitting provides a first chamber, the first passage permitting fluid communication between the sealed liquid storage container and the first chamber,

[0028] - a second chamber located adjacent to the first chamber,

[0029] - a first conduit allowing liquid to leave from the second chamber to the first nozzle for discharge, and

[0030] - At least the second chamber comprises a damper for storing pressure when liquid is pumped from the second chamber to the first nozzle and for releasing pressure when liquid is not pumped from the second chamber to the first nozzle.

[0031] Preferably, the liquid delivery accessory may include a single needle tube, which defines a first channel and a second channel separated from the first channel; a third chamber located adjacent to the first chamber, the second channel allowing gas communication between the third chamber and the sealed liquid storage container; and an inlet allowing ambient air or gas to enter the chamber and then enter the liquid storage container.

[0032] Suitably, the first chamber may be provided with a first orifice allowing fluid communication with the second chamber, and the first orifice may be reciprocally closed by a first one-way valve; the second chamber may be provided with a second orifice, the second orifice may be reciprocally closed by a second one-way valve for controlling the flow of fluid to the first nozzle; the second chamber may be provided with a first plunger, the first plunger may be operated by a motor for pumping fluid from the sealed liquid storage container to the first chamber via the first channel, then to the second chamber via the first orifice, and then to the second chamber via the second one-way valve. The invention relates to a sealed liquid storage container having two orifices; the third chamber may be provided with a second plunger, which can be operated by a motor to pump ambient air or gas into the third chamber through the inlet and then pumped into the sealed liquid storage container through the second channel; the second chamber may be provided with a first sub-chamber extending therefrom; the third chamber may be provided with a third one-way valve for controlling the entry of ambient air or gas into the third chamber, and a fourth one-way valve for controlling the passage of air or gas from the third chamber to the sealed liquid storage container, so as to balance the pressure in the liquid storage container.

[0033] Advantageously, the accessory may include a fourth chamber located adjacent the first chamber and a second conduit allowing liquid to leave the fourth chamber for use in the second nozzle, wherein the first chamber may be provided with a third orifice allowing fluid communication with the fourth chamber, and the fourth orifice may be reciprocally closed by a fifth one-way valve; the fourth chamber may be provided with a fourth orifice, which may be reciprocally closed by a sixth one-way valve for controlling the flow of fluid to the second nozzle; and the fourth chamber may be provided with a third plunger, which may be operated by a motor for pumping fluid from the liquid storage container to the first chamber via the first conduit for use in the second nozzle.

[0034] In one embodiment, the accessory may include a fifth chamber that houses the first, second and third plungers and a motor, the fifth chamber may include a pivotable plate that can be driven by the motor and used to alternately actuate on the first, second and third plungers for producing a pumping action. The first and fifth one-way valves may be configured to allow one-way fluid flow from the first chamber to the second chamber and from the first chamber to the fourth chamber, respectively.

[0035] According to a third aspect of the present invention, there is provided a floor cleaning device comprising a cleaning head portion for engaging a floor surface during cleaning, an upright portion for manipulating the movement of the cleaning head portion, a liquid delivery accessory as described above, a handle portion extending from the upright portion, and a sealed liquid container, wherein the cleaning head portion comprises a first nozzle and a second nozzle arranged at laterally opposite ends for discharging liquid forwardly therefrom.

[0036] Preferably, in sequence, the sealed liquid storage container, the first channel of the needle tube, the first chamber, the second chamber, the first conduit and the first nozzle can together define a liquid flow path; in sequence, the sealed liquid storage container, the first channel of the needle tube, the first chamber, the fourth chamber, the second conduit and the second nozzle can together define a liquid flow path; in sequence, the surrounding air or gas, the inlet, the third chamber, the second channel of the needle tube and the sealed liquid storage container can together define a gas flow path.

[0037] According to a fourth aspect of the present invention, there is provided a floor cleaning apparatus comprising a cleaning head portion for engaging a floor surface during cleaning, an upright portion for manipulating movement of the cleaning head portion, a liquid delivery accessory, a handle portion extending from the upright portion, and a sealed liquid storage container, wherein the cleaning head portion comprises a first nozzle and a second nozzle for discharging a cleaning detergent therefrom, wherein the liquid delivery accessory comprises:

[0038] - a needle tube defining a first channel and a second channel separate from the first channel,

[0039] - a first chamber, the first passage allowing fluid communication between the sealed liquid storage container and the first chamber,

[0040] - a second chamber located adjacent to the first chamber,

[0041] - a first duct allowing liquid to leave from the second chamber towards the first nozzle for discharge,

[0042] - a third chamber located adjacent to the first chamber, the second passage allowing gas communication between the third chamber and the sealed liquid storage container,

[0043] - an inlet that allows ambient air or gas to enter the third chamber and then into the liquid storage container,

[0044] - a fourth chamber located adjacent to the first chamber, and

[0045] - a second duct allowing liquid to leave from the fourth chamber towards the second nozzle for discharge.

[0046] Preferably, the first chamber may be provided with a first orifice for fluid communication with the second chamber, and the first orifice may be reciprocatingly closed by a first one-way valve, the first chamber may be provided with a second orifice for fluid communication with the fourth chamber, and the second orifice may be reciprocatingly closed by a second one-way valve, the second chamber and the fourth chamber may be provided with a first spring-loaded valve and a second spring-loaded valve, respectively, for minimizing liquid leakage from the first conduit and the second conduit, respectively, and the second chamber and the fourth chamber may be provided with a first plunger and a second plunger, respectively, the first plunger and the second plunger may be operated by a motor, for pumping fluid from the sealed liquid container to the first and second nozzles for discharge, respectively.

[0047] Suitably, the third chamber may be provided with a third plunger which may be operated by a motor for pumping ambient air or gas into the third chamber via the inlet and then into the sealed liquid storage container via the second channel for balancing the pressure in the sealed liquid container; the inlet may act as a third one-way valve for controlling the entry of ambient air or gas into the third chamber; and the third chamber may be provided with a fourth one-way valve for controlling the passage of air or gas from the third chamber to the sealed liquid storage container for balancing the pressure in the liquid storage container.

[0048] Advantageously, the liquid delivery accessory may include a fifth chamber which accommodates the first, second and third plungers and a motor, and wherein the fifth chamber may include a pivotable plate which is movable by a motor and is used to alternately actuate on the first, second and third plungers to produce a pumping action.

[0049] In an embodiment, the cleaning head portion may be free of any check valve for controlling leakage of liquid from the first nozzle and / or the second nozzle when the floor cleaning apparatus is not in use.

[0050] In one embodiment, at least one of the second chamber and the fourth chamber may include a damper for storing pressure when liquid is pumped from the second chamber to the first nozzle and / or from the fourth chamber to the second nozzle for discharge.

[0051] According to a fifth aspect of the present invention, there is provided a liquid delivery accessory for controlling the flow of liquid from a sealed liquid storage container to a first nozzle, comprising:

[0052] - a needle tube defining a first channel and a second channel separate from the first channel,

[0053] - a first chamber, the first passage allowing fluid communication between the sealed liquid storage container and the first chamber,

[0054] - a second chamber located adjacent to the first chamber,

[0055] - a first duct allowing liquid to leave from the second chamber towards the first nozzle for discharge,

[0056] - a third chamber located adjacent to the first chamber, the second passage allowing gas communication between the third chamber and the sealed liquid storage container, and

[0057] - an inlet allowing ambient air or gas to enter the third chamber and then into the liquid storage container.

[0058] Preferably, the first chamber may be provided with a first orifice allowing fluid communication with the second chamber, and the first orifice may be reciprocally closed by a first one-way valve. The second chamber may be provided with a second orifice, the second orifice may be reciprocally closed by a second one-way valve for controlling the flow of fluid to the first nozzle; the second chamber may be provided with a first plunger, the first plunger may be operated by a motor for pumping fluid from the sealed liquid storage container to the first chamber via the first passage, then to the second chamber via the first orifice, and then to the second chamber via the second orifice; the third chamber may be provided with a second plunger, the second plunger may be operated by the one motor for pumping ambient air or gas to the third chamber via the inlet, then to the sealed liquid storage container via the second passage; and the second chamber may be provided with a first sub-chamber extending therefrom.

[0059] Suitably, the third chamber may be provided with a third one-way valve for controlling the entry of ambient air or gas into the third chamber, and a fourth one-way valve for controlling the passage of air or gas from the third chamber to the sealed liquid storage container, so as to balance the pressure in the liquid storage container.

[0060] Advantageously, the accessory may include a fourth chamber located adjacent to the first chamber, and a second conduit allowing liquid to leave the fourth chamber for use in a second nozzle, wherein the first chamber may be provided with a third orifice allowing fluid communication with the fourth chamber, and the fourth orifice may be reciprocally closed by a fifth one-way valve; the fourth chamber may be provided with a fourth orifice, which may be reciprocally closed by a sixth one-way valve for controlling the flow of fluid to the second nozzle; and the fourth chamber may be provided with a third plunger, which may be operated by the one motor for pumping fluid from the liquid storage container to the first chamber via the first conduit for use in the second nozzle.

[0061] In one embodiment, the accessory may include a fifth chamber that accommodates the first, second and third plungers and the one motor, and the fifth chamber may include a pivotable plate that can be driven by a motor and used to alternately actuate on the first, second and third plungers to produce a pumping action.

[0062] In one embodiment, the first one-way valve and the fifth one-way valve may be configured to allow one-way fluid flow from the first chamber to the second chamber and from the first chamber to the fourth chamber, respectively.

[0063] In another embodiment, the second chamber may include a dampener for storing pressure when liquid is pumped from the second chamber to the first nozzle for discharge.

[0064] In another embodiment, a floor cleaning device is provided, comprising: a cleaning head portion for engaging a floor surface during cleaning; an upright portion for manipulating movement of the cleaning head portion; a liquid delivery accessory as described above; a handle portion extending from the upright portion; and a sealed liquid container, wherein the cleaning head portion may include a first nozzle and a second nozzle arranged at laterally opposite ends for discharging liquid forwardly therefrom.

[0065] In such an embodiment, in sequence, the sealed liquid storage container, the first channel of the needle tube, the first chamber, the second chamber, the first conduit and the first nozzle can together define a liquid flow path. In addition, in sequence, the sealed liquid storage container, the first channel of the needle tube, the first chamber, the fourth chamber, the second conduit and the second nozzle can together define a liquid flow path. Further, in sequence, the surrounding air or gas, the inlet, the third chamber, the second channel of the needle tube and the sealed liquid storage container can together define a gas flow path.

[0066] The cleaning head portion may be free of any non-return valve for controlling leakage of liquid from the first nozzle when the floor cleaning device is not in use.

[0067] According to a third aspect of the present invention, a floor cleaning device is provided, comprising: a cleaning head portion for engaging a floor surface during cleaning; an upright portion for manipulating the movement of the cleaning head portion; a liquid delivery accessory; a handle portion extending from the upright portion; and a sealed liquid storage container, wherein the liquid delivery accessory comprises a single needle tube defining a first channel and a second channel, the first channel being used to allow cleaning detergent to pass from the sealed storage container through it to the cleaning head portion, the second channel being used to allow gaseous air to pass from the surrounding environment to the sealed storage container for pressure balance, and wherein the needle tube has a non-cylindrical configuration and a flat configuration.

[0068] Preferably, the needle tube may have a length of 20-22 mm; the needle tube may have a width of 6-7.5 mm at the base and gradually taper toward its tip; the needle tube may be provided with a wall separating the first channel and the second channel, and the thickness of the wall in the needle tube is 1.5-2 mm; the first channel and the second channel both have a cylindrical profile, and the diameter of the first channel and the second channel is 1.8-2.5 mm; and the needle tube may be made of polyoxymethylene (POM) or nylon or a non-metallic material.

[0069] According to a fourth aspect of the present invention, there is provided a liquid delivery fitting for controlling the flow of liquid from a sealed liquid storage container for discharge, the liquid delivery fitting comprising a damping device for temporarily storing pressure, thereby increasing the flow rate of the discharged liquid.

[0070] According to a fifth aspect of the present invention, there is provided a liquid handling accessory for controlling the flow of a first liquid from a first liquid storage container and controlling the flow of a second liquid from a second liquid storage container for discharge, and for mixing the first fluid and the second fluid for producing a formulation therefrom during discharge, comprising:

[0071] - a first chamber,

[0072] - a first line allowing fluid communication between a first liquid storage container and the first chamber,

[0073] - a second chamber located adjacent to said first chamber,

[0074] - a second line, said first conduit allowing fluid communication between the second liquid storage container and the second chamber,

[0075] - a first outlet from said first chamber and a second outlet from said second chamber, and

[0076] - a combiner for mixing the first fluid and the second fluid exiting from the first outlet and the second outlet, respectively,

[0077] in:

[0078] a. the first chamber is provided with a first plunger, the first plunger being operable by a motor for pumping fluid from a first liquid storage container to the first chamber via the first pipeline, and

[0079] b. The second chamber is provided with a second plunger operable by the one motor for pumping fluid from a second liquid storage container to the second chamber via the second pipeline.

[0080] Preferably, the first and second liquid storage containers may be sealed containers. The liquid handling accessory may be provided with a third chamber, the third chamber allowing gaseous or air communication between the third chamber and the first and second sealed liquid containers. In this configuration, two pipelines branching from the third chamber to the first and second sealed liquid containers will be required. Alternatively, the liquid handling accessory may be provided with a third chamber and a third pipeline and a fourth chamber and a fourth pipeline, respectively, the third chamber and the third pipeline allowing gaseous or air communication between the third chamber and the first sealed liquid storage container for balancing the pressure in the first sealed liquid container, and the fourth chamber and the fourth pipeline allowing gaseous or air communication between the fourth chamber and the second sealed liquid storage container for balancing the pressure in the second sealed liquid container. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] Some embodiments of the present invention will now be explained with reference to the accompanying drawings, in which:

[0082] FIG1 is a perspective view of a conventional floor cleaning device;

[0083] FIG2 is a schematic diagram illustrating a liquid delivery accessory included in the device of FIG1 ;

[0084] Figure 3 is a perspective view of an embodiment of a floor cleaning device according to one aspect of the present invention;

[0085] Figure 4 is an example of another aspect of the present invention and includes Figure 3 A schematic diagram of an embodiment of a liquid delivery accessory in a device;

[0086] Figure 5A yes Figure 4 3D view of liquid delivery accessories;

[0087] Figure 5B yes Figure 5A Exploded view of the liquid delivery accessories;

[0088] Figure 6 yes Figure 5A A perspective view of a liquid delivery fitting with a top cover and a middle cover removed;

[0089] Fig. 7A yes Figure 5A An exploded view of the liquid transfer fitting with the top cover removed;

[0090] Figure 7B yes Fig. 7A A schematic diagram of a liquid delivery accessory;

[0091] Fig. 8A This is an example showing Figure 5A A schematic diagram of different chambers (or compartments) defined in a liquid delivery accessory;

[0092] Figure 8B and Figure 8C yes Figure 5A A schematic diagram of a liquid delivery fitting of the embodiment of the present invention, but with its lower portion removed;

[0093] Fig. 9A This is an example showing Figure 5A A schematic diagram of different chambers (or compartments) defined in a liquid delivery accessory;

[0094] Fig. 9B and Fig. 9C yes Figure 5A Schematic diagram of the liquid delivery fitting, with the lower part also removed;

[0095] Fig. 10AThis is an example showing Figure 5A A schematic diagram of different chambers (or compartments) defined in a liquid delivery accessory;

[0096] Fig. 10B yes Figure 5A Schematic diagram of the liquid delivery fitting, with the lower part also removed;

[0097] Fig.11 This is an example of how the Figure 5A A schematic diagram of a liquid flow path of a liquid delivery accessory;

[0098] Fig.12 This is an example of how the Figure 5A A schematic diagram of the air or gas flow path of the liquid delivery accessory;

[0099] Fig.13A and Fig. 13B It shows Figure 5A Schematic diagram of two different states of the liquid delivery accessory;

[0100] Fig.14A , Fig. 14B and Fig. 14C It shows Figure 5A Schematic diagram of three different states of the liquid delivery accessories;

[0101] Fig.15A and Fig. 15B They are side-by-side schematic diagrams of the conventional liquid delivery accessory and the novel liquid delivery accessory of FIG. 2 ;

[0102] Fig.16A is shown with Figure 5A Embodiments of liquid delivery accessories Schematic diagrams of three-dimensional views of different embodiments of liquid delivery accessories;

[0103] Fig. 16B yes Fig.16A Exploded view of the liquid delivery accessories;

[0104] Fig.17 yes Fig.16A A perspective view of a liquid delivery fitting with a top cover and a middle cover removed;

[0105] Fig.18A yes Fig.16A An exploded view of a liquid transfer fitting with the top cover removed;

[0106] Fig.18B yes Fig.18A A schematic diagram of the liquid delivery accessories, and Figure 18B1 yes Fig.18B A partial enlarged view of

[0107] Fig.19A This is an example Fig.16A A schematic diagram of different chambers (or compartments) defined in a liquid delivery accessory;

[0108] Fig.19B yes Fig.16A Schematic diagram of a liquid delivery fitting with its lower portion removed, and Figure 19B1 yes Fig.19B an enlarged view of a portion of;

[0109] Fig.19C yes Fig.16A Schematic diagram of a liquid delivery fitting, but illustrating the flow of fluid in a different way,

[0110] Fig. 20A This is an example showing Fig.16A A schematic diagram of different chambers (or compartments) defined in a liquid delivery accessory;

[0111] Fig. 20B yes Fig.16A Schematic diagram of the liquid delivery fitting, with the lower part also removed;

[0112] Fig. 20C yes Fig. 20B Another schematic diagram of Fig.20C1 yes Fig. 20C A partial enlargement of

[0113] Fig.21A yes Fig.16A Schematic diagram of the liquid delivery fitting, with the lower part also removed, and Fig.21A1 It shows Fig.21A an enlarged view of a portion of;

[0114] Fig.22A This is an example of how the Fig.16A A schematic diagram of the liquid flow path of the liquid delivery fitting, and Fig.22A1 It shows Fig.22A A magnified view of a portion of

[0115] Fig.23A This is an example of how the Fig.16A A schematic diagram of the air or gas flow path of the liquid delivery fitting, and Fig.23A1 is an enlarged view showing a portion of FIG. 23;

[0116] Fig.24A and Fig. 24B It shows Fig.16A Schematic diagrams of two different states of a liquid delivery accessory; and

[0117] Fig.25A and Fig.25BIt shows Figure 5A Schematic diagram of two different states of a liquid delivery accessory. DETAILED DESCRIPTION

[0118] FIG. 1 shows a perspective view of a conventional floor cleaning device 2. The device comprises a cleaning head portion 4, an upright portion 10 and a handle portion 12, the cleaning head portion 4 being provided with two nozzles 6, 8 arranged at opposite sides thereof to discharge liquid detergent forward. The upright portion 10 is equipped with a container 14 in the form of a liquid detergent reservoir and a component or accessory 16 (shown in FIG. 2 ) for controlling the delivery of liquid detergent from the reservoir to the nozzles 6, 8 to discharge forward. The delivery component 16 comprises a plurality of cylinders or separate devices provided in a separate position in the device 2, but otherwise connected together by parts such as conduits, pipes, pipelines, etc.

[0119] Fig. 2 is a schematic diagram of the operation of the delivery component 16 of the device 2 of general description Fig. 1. Delivery component 16 comprises a container A (14) for storing liquid detergent, a pump B, a diverter C for bifurcating or directing the liquid detergent passed through to the conduit D, E of the corresponding nozzle D1, E1 for discharging, and a valve component F for allowing air to enter the container A for pressure balance. Pump B is located at the upright part 10 of the device 2. Diverter C is located in the cleaning head part 4 of the device 2 and is provided with a one-way valve therein, for minimizing the leakage of liquid detergent from pump B to nozzle D1, E1 when the device 2 is not used and / or when the cleaning head part is in an inclined direction. Although both pump B and valve component F can be located in the upright part 10, it should be noted that pump B and diverter C are located in different parts in the device 2 and are connected by conduits D, E and conduit G. For example, when the user is in use, pump B is operated, and when the pressure in container A drops, the valve component is operated individually and passively. There are many problems that tend to occur with the device 2 or the delivery component 16. Firstly, the construction and assembly of the delivery component 16 and the device 2 are technically complex in terms of the manufacture of the device 2, with the pump B, the diverter C and the valve component F positioned and / or operated separately. Secondly, since the valve component F operates passively and is connected to the container 14 filled with a liquid detergent that is usually viscous, the air inlet or the non-return valve of the valve component F leading to the container 14 tends to experience the problem of "sticking", which means that the air inlet or the non-return valve tends to get blocked or malfunction over time when the liquid detergent there dries up. Thirdly, the delivery of liquid detergent to the two nozzles 6, 8 is not independent, which also reduces reliability. These are just some of the problems.

[0120] Figure 3A perspective view of an embodiment of a floor cleaning device 102 according to one aspect of the present invention is shown. The device 102 includes a cleaning head portion 104 having two nozzles 106, 108 arranged at opposite sides thereof to discharge liquid detergent forward, an upright portion 110, and a handle portion 112. According to another aspect of the present invention, the upright portion 110 is equipped with a container 114 in the form of a sealed reservoir for liquid detergent storage and a first embodiment of a liquid delivery accessory 116. The accessory 116 is used to control the delivery of liquid detergent from the reservoir to the nozzles 106, 108 for forward discharge.

[0121] Figure 4 1 is a schematic diagram illustrating an accessory 116 according to another aspect of the present invention. The accessory 116 includes a container A' (or a sealed liquid container 146) for liquid detergent, a pump unit B', conduits D', E' for corresponding nozzles D1' (106), E1' (108), a component for branching the flow of fluid to the conduits D', E' and a valve component F' for allowing air to enter the container A' (146) for equalizing pressure. Further details of the device 102 and the accessory 116 are explained below.

[0122] Figure 5A 1 is a schematic diagram illustrating the construction of a liquid delivery fitting 116 or at least a portion of the construction of the fitting 116. The fitting 116 is in the form of an integral operating system having: a first pipeline 118 allowing fluid from a container 114 to be connected to the fitting 116, a second pipeline 120 allowing ambient air or gas to be connected to the container 114 via the fitting 116 to balance the pressure in the container 114, fluid outlets 122, 124, a battery (not shown) and a motor 126 powered by the battery for operating the fluid flow and air or gas flow in the fitting 116. In this embodiment, the sealed liquid container A' (146) has a cover made of a self-sealable silicone film material. The first pipeline and the second pipeline are both in the form of a rigid metal tube (e.g., a steel tube) with a sharp end. With this configuration, the pipelines 118, 120 can be inserted into the container A' (140) via the cover, and then a liquid-tight seal is automatically formed around the pipelines 118, 120.

[0123] Figure 5B yes Figure 5A1. An exploded view of an accessory of FIG. 116. As shown, the accessory 116 includes a housing 128 for accommodating a motor 126 and a three-cylinder arrangement. The three cylinders in the arrangement are respectively operable by three plungers 130, 132, 134. The plungers 130, 132, 134 are similar to three pumps that can be driven by the motor 126. The housing 128 is provided with a circumferential flange 129. The accessory 116 is provided with a lower cover 137, in which the plungers 130, 132, 134 are arranged, and the housing 128 is engaged with the lower cover.

[0124] Figure 6 yes Figure 5A 116, but with the housing 128 removed. In this figure, the three plungers 130, 132, 134 are more clearly shown. A wall 136 is provided defining a lower surface to which the tops of the three plungers 130, 132, 134 engage and are connected. The plungers 130, 132, 134 are operable by a swingable plate 146 that is movable by the shaft of the motor 126.

[0125] Fig. 7A yes Figure 6 138, but with a middle cover 138. A bottom view of the middle cover 138 is shown. Figure 7B roughly corresponds to Fig. 7A , but a top view of the middle cover 138 is also shown. (Note that in this specification, references to "top", "bottom", etc. refer to their relative positions and are not intended to be limited in absolute orientation.) The bottom surface of the middle cover 138 is provided with three recesses 130a, 132a, 134a, respectively. It can therefore be understood that a cavity is provided or defined at the recesses 130a, 132a, 134a between the middle cover 138 and the wall 136. In this embodiment, three chambers are generally defined between the middle cover 138 and the three plungers 130, 132, 134. The three cylinders mentioned above correspond to these three regions. The three cylinders include two cylinders for fluid transmission and one cylinder for air or gas transmission. The three regions are region 140, region 142, and region 144.

[0126] The middle cover 138 at the area 140 is provided with a one-way valve 140a for allowing one-way fluid to flow from top to bottom through the middle cover 138 via the opening 140b. The middle cover 138 at the area 140 is also provided with a one-way valve 140c for allowing one-way fluid to flow from bottom to top through the middle cover 138 via the opening 140d. Figure 7BThe operation of the plunger 130 is illustrated. Please see the dashed plunger 130. The arrows illustrate that when the plunger 126 is operated by the motor 126 via the swingable plate 146, the fluid is caused to pass through the middle cover 138 from top to bottom via the opening 140b, and then from bottom to top via the opening 140d.

[0127] The area 142 of the middle cover 138 is similar to the area 140, in that the area 142 is also provided with a one-way valve 142a for allowing a one-way fluid to pass through the middle cover 138 from above to below via the opening 142b. The middle cover 128 at the area 142 is provided with a one-way valve 142c for allowing a one-way fluid to pass through the middle cover 138 from below to above via the opening 142d. The flow of fluid in the area 142 is caused by the plunger 132 operated by the same motor 126.

[0128] The region 144 of the middle cover 138 is different from the regions 140, 142 to some extent. Structurally, a one-way valve 144c is provided (see Figure 7B ). Functionally, the one-way valve 144c is configured to allow one-way gas or air to pass through the middle cover 138 from bottom to top via the opening 144d. Fig. 7A and Figure 7B Not shown, the region 144 is provided with an air inlet 164 at the wall 136 for allowing air or gas to enter the chamber defined between or by the middle cover 138 and the plunger 134 .

[0129] It can therefore be understood that the fitting 116 defines two fluid flow paths due to the presence of two chambers corresponding to regions 140, 142. It can also be understood that the fitting 116 defines one air or gas flow path due to the presence of one chamber corresponding to region 144. The two fluid chambers and one air / gas chamber and the corresponding plungers 130, 132, 134 can therefore be understood as a three-cylinder arrangement.

[0130] Fig. 8A Two schematic diagrams, namely a left schematic diagram and a right schematic diagram, illustrate when the accessory 116 is in operation. Fig. 7A The two states of the region 140 of the middle cover 138 are shown in FIG. Specifically, Fig. 8A (right) shows a top view of the middle cover 138 in operation, and Fig. 8A (Left) shows a bottom view of the middle cover 138 in operation.

[0131] Figure 8B and Figure 8C is with Fig. 8A (Right) Two corresponding schematic diagrams. It should be noted that Figure 8B and Figure 8CNot only does it show Fig. 7A and Figure 7B The accessory 116 is also shown with a top cover 148. Thus, Figure 8B and Figure 8C Further illustrated is a chamber defined between the top cover 148 and the middle cover 138, and fluid communication from the container 114 via the first pipeline 118 and then to the subsequent chamber. Figure 8B It will be appreciated that the middle cover 138 and the top cover 148 together define a chamber 150 therebetween. When fluid is drawn from the container 114 to the fitting 116 via the first line 118, the fluid first reaches the chamber 150. Fig. 8A The gray area in (right) illustrates the upper surface of the middle cover 138 and the interval between the top cover 148 and the middle cover 138 when the chamber 150 is filled with fluid. The fitting 116 is also provided with a chamber 152 and a chamber 154 between the middle cover 138 and the wall 136. The chambers 152, 154 are the intervals between the middle cover 138 and the wall 136. The fitting 116 is configured so that the fluid in the chamber 150 can then be transferred and branched through the openings 140b and 142b and reach the chamber 152 and the chamber 154, respectively. Figure 8B and Figure 8C The arrows in exemplify the fluid flow pattern when the fitting 116 is in operation. Fig. 8A The grey areas in (left) illustrate chambers 152 , 154 filled with fluid transferred from chamber 150 .

[0132] Fig. 9A Two schematic diagrams, namely a left schematic diagram and a right schematic diagram, illustrate when the accessory 116 is in operation. Fig. 7A The two states of the middle cover 138 are shown in FIG.

[0133] Fig. 9B and Fig. 9C is with Fig. 9A (Left) Two corresponding schematic diagrams respectively illustrate the fluid communication from chambers 152, 154 to nozzles 122, 124. Figure 8A-8C In the embodiment of the present invention, after the fluid has reached the chambers 152, 154, the continued operation of the plungers 130, 132 will drive the fluid out of the chambers 152, 154 through the openings 140d, 142d and then through the valves 140c, 142c, respectively. The fluid will then exit the nozzles 122, 124, respectively. The nozzles 122, 124 are arranged on opposite sides of the top cover 148 or extend from opposite sides of the top cover 148. Fig. 9C The arrows in exemplify subsequent fluid flow patterns when the accessory 116 is in use.

[0134] Fig. 10A It is an example Fig. 7ASchematic diagram of the state of the middle cover 138 shown in FIG. Fig. 10B is with Fig. 10A The corresponding schematic diagram illustrates an air or gas communication path from the surrounding to the second pipeline 120. The chamber 160 is provided at the area 144 between the top cover 148 and the middle cover 138, as shown by Fig. 10A The gray area in the figure is shown. Fig. 10B An air inlet 164 is shown at the wall 136 for allowing ambient gas or air to enter, a one-way valve 144c for controlling the state of the orifice 144d at the middle cover 138 to control the entry of ambient gas into the chamber 160, and a one-way valve 162 for controlling the transmission of air or gas from the chamber 160 to the container 114 via the pipeline 120. Fig. 10B The arrows in exemplify the air flow path.

[0135] Respectively Fig. 9C and Fig. 10B Corresponding Fig.11 and Fig.12 is a schematic diagram illustrating simultaneous fluid flow and gas / air flow when the fitting 116 is in operation.

[0136] To further explain the structure and working of accessory 116, Figure 13A-13B and Figure 14A-14B The structure of the accessory is shown in the figure. For ease of understanding, it should be at least Fig. 7A Let’s review together Figure 13A-13B and Figure 14A-14B .

[0137] generally, Figure 13A-13B Two configurations of the fluid transfer mechanism in the fitting 16 are illustrated as fluid transfer in the fitting occurs.

[0138] Fig.13A Illustrated is a fitting 116 including a chamber 150 and a line 118 for supplying fluid to chamber 150 and then splitting into chambers 152 and 154. Chamber 150 is provided with a single valve 140a for controlling the state of orifice 140b and a single valve 142a for controlling the state of orifice 142b.

[0139] The chamber 152 is provided with a sub-chamber 152a extending therefrom and a single valve 140c for controlling the state of the orifice 140d. The sub-chamber 152a is also provided with a spring loaded valve 156 for controlling the orifice 156a before the fluid exits the nozzle 122.

[0140] Similar to chamber 152, chamber 154 also has a sub-chamber 154a extending therefrom and a single valve 142c for controlling the state of orifice 142d. Sub-chamber 154a is also provided with a spring loaded valve 158 for controlling orifice 158a before fluid exits nozzle 124.

[0141] Fig.13A The fitting 116 is shown in a first configuration. In this configuration, when the plunger 130 for the chamber 152 is in a low position caused by the first end of the swingable plate 146, a suction effect (i.e., a pressure drop) is created, causing the check valve 140b to open to allow fluid to pass from the chamber 150 to the chamber 152 via the orifice 140b. At the same time, the suction closes the check valve 140c.

[0142] When the plunger 130 for chamber 152 is in a low position caused by one end of the swingable plate 146, the plunger 132 for chamber 154 is in a high position caused by the second end of the swingable plate 146. As a result, a blow-off effect (i.e., pressure increase) is produced, causing the check valve 142a to close, and the check valve 142c and the spring-loaded valve 158 to open, so that fluid is allowed to pass from the chamber 154 to the sub-chamber 154a via the orifice 142c and then via the orifice 158a, and then to the nozzle 122.

[0143] Fig. 13B The fitting 116 is shown in a second configuration. In this configuration, when the plunger 130 is now in a high position by the third end of the swingable plate 146, a blow effect is produced, causing the one-way valve 140a to close and the one-way valve 140c and the spring-loaded valve 156 to open, so as to allow fluid to pass from the chamber 152 to the sub-chamber 152a via the orifice 140d and the orifice 156a, and then to the nozzle 122. It can be envisioned that the swingable plate 146 has a three-pronged profile, wherein the three prongs engage with the plungers 130, 132, 134 respectively.

[0144] When the plunger 130 is caused to be in the high position by the first end of the swingable plate 146, the plunger 132 is now caused to be in the low position by the second end of the swingable plate. As a result, suction is generated, causing the one-way valve 142d to open so as to allow fluid to pass from the chamber 155 to the sub-chamber 154 via the orifice 142b. At the same time, the suction closes the one-way valve 142c.

[0145] When the swingable plate 146 connected to the plungers 130, 132 is pushed and pulled reciprocatingly, the plungers 130, 132 are in alternating positions, thereby pumping the fluid through the pipeline 118 to the chamber 150, then branching to the chambers 152, 154, and then reaching the sub-chambers 142a and 154a, and finally reaching the nozzles 122, 124 respectively.

[0146] FIG. 14A to FIG. 14C Three configurations of the air or gas delivery mechanism in the fitting 116 are shown for equalizing the pressure in the container 114 when the fitting 116 is in operation. Specifically, FIG. 14A to FIG. 14C It is shown that the accessory 116 includes a chamber 160 defined between the top cover 148 and the middle cover 138, a plunger 134 for operating the chamber 160, an inlet 164 leading to the chamber 160, a one-way valve 144c for controlling the entry of ambient air or gas into the chamber 160, and a one-way valve 162 for controlling the transmission of air from the chamber 160 to the container 114 via the pipeline 120.

[0147] Fig.14A A first configuration of the pressure balancing mechanism is illustrated in which the plunger 134 is in its low position. This low or initial position of the plunger 134 creates suction and causes both one-way valves 144c, 162 to close while the inlet 164 is open.

[0148] Fig. 14B As illustrated, when the plunger 134 moves upwardly through the first end (or prong) of the swingable plate 146, an initial pumping effect is created and, as a result, the inlet 164 is closed while both check valves 144c, 162 are opened.

[0149] Fig. 14C As shown, once both one-way valves 144c, 162 are open, the lower pressure or negative pressure in chamber 160 causes inlet 164 to also open, thereby allowing air to be transferred from the surrounding environment into container 114, so that the pressure loss in the sealed liquid container is replenished. When plunger 134 is reciprocated by swingable plate 146, the pressure in container 114 is continuously replenished and maintained. It should be understood that the displacement of the cylinder formed by chamber 160 does not need to match the displacement of the cylinder formed by chambers 150, 152, 154, because due to the negative pressure, a corresponding amount of air will be automatically sucked into the sealed liquid detergent container 114 until the pressure is balanced.

[0150] It should be noted that all three plungers 130, 132, 134 are alternately operated by these distal ends (or prongs) of the swingable plate 146. Therefore, when the fitting 116 discharges liquid from the sealing liquid container 116 via the conduits 122, 124, the pressure drop in the sealing liquid is replenished and the flow of fluid from the container 114 to the chamber 150 will not be hindered.

[0151] Fig.15A and Fig. 15B Corresponding to Figure 2 and Figure 4 , but are shown side by side for ease of comparison. Fig.15Adenoted a liquid delivery part 16. In this part 16, three separate units are provided, namely, a pump B, a diverter C, and a valve part F. With this configuration, when the pump B is actively operated, the diverter C and the valve part F are passively operated.

[0152] Fig. 15B Represents a liquid delivery fitting 116. In this fitting 116, pump B', components for bifurcating fluid to conduits D', E', and valve components F' are integrally formed. In other words, they are part of a discrete unit. For example, fitting 116 provides a plurality of cylinders and chambers separated by partitions, and the operation of the cylinder and the fluid flow and air flow in the integral fitting 116 are completed by a motor. In addition, the floor cleaning portion 104 does not have any bifurcators for guiding fluid to the two nozzles 106, 108. The bifurcating function has been provided by the integral fitting 116 installed in the upright portion 110 of the device 102. Although there is no need to pass an additional check valve in the floor cleaning portion 104, leakage of the fluid is prevented by the independent valves 140d, 156, 142c, 158 in the fitting 116 in the upright portion 110. Through this construction, the fitting 116 can therefore be made more compact, and from the perspective of industrial engineering, it is more technically effective to install the fitting 116 to the rest of the device 102.

[0153] In the above embodiments, the accessory 116 generally adopts a three-cylinder arrangement with chambers (e.g., chambers 150, 152, 154, 160, etc.) and partitions (e.g., top cover 148, middle cover 138, etc.) arranged adjacent to each other. The three-cylinder arrangement is formed into a larger cylindrical structure. However, the present invention includes alternative embodiments. For example, the three chambers 152, 154, 160 can be arranged in a radial configuration. As another example, the three chambers 152, 154, 160 can be arranged linearly or in a V-shaped manner. In addition, other alternative embodiments are possible when only two hydraulic cylinders (operable by one motor) are required, when only one hydraulic cylinder and one air / gas cylinder (operable by one motor) are required, and / or when three hydraulic cylinders are required.

[0154] In the above described embodiment, the swingable plate 146 is used as a pivotally movable actuator on the plungers 130, 132, 134. In alternative embodiments, other forms of actuators for providing reciprocating or oscillatory motion to the plungers 130, 132 driven by the motor 126 will also work.

[0155] In the above embodiments, plungers 130, 132, 134 are used as diaphragm pumps to achieve fluid and air / gas flow. It is contemplated that other types of diaphragm pumps or pumps may also function.

[0156] FIG. 13A to FIG. 13B Chamber 150 is shown as being located above chambers 152, 154. However, in other embodiments, chamber 150 may be located on adjacent sides of chambers 152, 154, for example.

[0157] Although one embodiment of a floor cleaning device including the first embodiment of the liquid delivery accessory 116 has been illustrated above, FIG. 16A to FIG. 25B A second embodiment of a liquid delivery fitting 316 according to the present invention is illustrated. The following attempts to describe the construction of this alternative fitting 316. For the sake of brevity and ease of understanding, the following focuses on comparing the fitting 316 to the first embodiment 116 and comparing the differences thereby. As such, the construction of the fitting 316 should be understood in light of the construction of the fitting 116.

[0158] Fig.16A The overall structure of the second embodiment of the liquid delivery accessory 316 is shown. Fig. 16B is an exploded view of fitting 316. One major difference is that, unlike fitting 116 which has two separate lines (i.e., line 118 and line 120 defining two respective channels), fitting 316 has only a single needle tube 319 having an elongated body having or defining two channels, namely, channel 318 and channel 320 adjacent to but separate from channel 318. However, channel 318 is similar to line 118 of fitting 116 in that channel 318 also serves as a route for delivering liquid from a liquid container through fitting 316, and channel 320 serves as another route for delivering gas or ambient air through fitting 316. It is noted that while channels 318 and 320 share the same body of needle tube 319, they are separated by wall 319a, and they similarly lead to different chambers of fitting 316, as in fitting 116.

[0159] At least Figure 16A-16B and Fig.19C As illustrated in FIG. 1 , in this embodiment, the needle tube 319 has a certain configuration. First, the needle tube 319 is not a conventional needle tube having a cylindrical body. Instead, it has a flat configuration in which the width is wider than the thickness. The flat configuration is more obvious when the cross section of the needle tube 319 is envisioned. This configuration is understandable because the substantially cylindrical channels 318 and 320 are arranged side by side in parallel. Second, as shown in FIG. Fig.16A and Fig.19CAs more clearly shown in FIG. 3 , the needle tube 319 extends from the top end of the remainder of the fitting 316 and has a wider base. The needle tube 319 tapers toward its upper end. Towards the upper end of the needle tube 319, the channels 318, 320 terminate at two openings 318a, 320a, respectively. The needle tube 319 is also provided with a cutout area at the two openings 318a, 320a, thereby defining a sharp tip. The following table summarizes some physical parameters of the needle tube 316 of this embodiment.

[0160] Table 1: Physical parameters of the needle tube 319 of the accessory

[0161]

[0162]

[0163] It should be noted that while both channels 318, 320 reside in needle tube 319 and in use openings 318a, 320a are in fluid communication with a liquid storage container, the other ends of channels 318, 320 extend and lead to separate liquid and gas / air chambers, respectively.

[0164] Similar to Figure 6 , Fig.17 yes Fig.16A 316, but with its housing removed. In this figure, the three plungers 330, 332, 334 are more clearly shown. A wall 336 is provided defining a lower surface to which the tops of the three plungers 330, 332, 334 engage and are connected. The plungers 330, 332, 334 are operable by a swingable plate 346 that is movable by the shaft of the motor 326. In this embodiment, the motor 326 has a power output of 1.5-4W.

[0165] Accessories 316 Fig.18A , Fig.18B & Figure 18B1 , Fig.19A & Fig. 20A , Fig.19B & Figure 19B1 , Fig.19C , Fig. 20B , Fig. 20C & Fig.20C1 , Fig.21A & Fig.21A1 , Fig.22A & Fig.22A1 , Fig.23A & Fig.23A1 , Fig.24A , Fig. 24B , Fig.25A and Fig.25B Usually correspond to and should be based on the accessories 116 Fig. 7A , Figure 7B, Fig. 8A & Fig. 9A & Fig. 10A , Figure 8B , Figure 8C , Fig. 9B , Fig. 9C , Fig. 10B , Fig.11 , Fig.12 , Fig.13A , Fig. 13B , Fig.14A and Fig.25B Come to understand.

[0166] Fig.18B and Fig.18B One path for liquid flow within fitting 316 and particularly at plunger 330 is illustrated. Fig.19B , Figure 19B1 and Fig.19C The two routes of fluid flow within fitting 316 are illustrated in greater detail. Fig. 20C and Fig.20C1 The two routes of fluid flow within fitting 316 are illustrated in greater detail. Fig. 20C and Fig.20C1 as well as Fig.22A and Fig.22A1 The two routes of liquid flow within fitting 316 are illustrated in even greater detail.

[0167] Fig.19A and Fig. 20A is a cross-sectional view illustrating the filling of liquid into the cavity of the fitting 316 during operation.

[0168] Fig. 20B is a cross-sectional view taken along the plate of the intermediate cover 338. See Fig.19B .

[0169] Fig.21A and Fig.21A1 The path of air flow from the ambient environment through the fitting 316 to the liquid container to achieve pressure equalization is illustrated.

[0170] Fig.23A and Fig.23A1 The flow path of gas or ambient air within the fitting 316 and particularly at the plunger 334 is illustrated.

[0171] Another difference between fitting 316 and fitting 116 is that each of chambers 352 and 354 of fitting 316 is additionally provided with a damping device (or damper) (402 / 404). Figure 16A-16B , Figure 18A-18B , Figure 19B-Figure 19C , Fig. 20C , Fig.21A , Fig.22Aand Fig.23A . The damping device (402 / 404) is in the form of an elongated tube having an expandable wall with a closed end and an open end, and is fluidly connected to and suspended from the chamber (352 / 354). In this embodiment, the damping device is made of (multiple) soft elastic plastics, and suitable candidate materials include silicone rubber, ethylene propylene diene monomer rubber (EPDM) or thermoplastic polyurethane (TPU). With this construction, the volume (and its capacity) of the damping device (402 / 404) increases slightly when subjected to increased internal liquid pressure. In a specific embodiment, the inner diameter, outer diameter and length of the elongated tube are 3.6-4.4mm, 5.4-6.6mm and 27.45-33.55mm, respectively. In a more specific embodiment, the inner diameter, outer diameter and length of the elongated tube are 4mm, 6mm and 30.5mm, respectively. However, as long as the damper can expand slightly when subjected to increased internal fluid pressure and return to an unexpanded configuration after the increased pressure, such a damper is suitable. When the increased internal liquid pressure decreases between pumping cycles, the damping device (402 / 404) will return to its default or non-expanded state and extend the time for the fluid to be pumped to the nozzle. In other words, the damping device (402 / 404) acts as a pressure capacitor and enhances pumping efficiency and effectiveness. It is understandable that on conventional systems, when liquid is pumped for discharge during continuous pumping cycles, the discharged liquid often exhibits a continuous squeaking pattern. This is undesirable because the discharged liquid is not in the form of a continuous stream. On the contrary, the provision of the damper (402 / 404) extends the liquid discharge from each pumping motion, thereby effectively connecting the continuous discharge of the liquid to form a continuous liquid stream.

[0172] Accessories 316 Fig.24A and Fig. 24B Corresponding to accessory 116 Fig.13A and Fig. 13B Although fitting 316 similarly provides one-way valves 340a, 342a for controlling orifices 340b and 342b, these one-way valves 340a and 342a are rollover valves rather than disc valves. In addition, fitting 316 is provided with spring-loaded valves 356 and 358 for controlling discharge of liquid to the first and second nozzles, respectively, rather than providing both disc valves and spring-loaded valves as in fitting 116. In addition, as illustrated above, chambers 352 and 354 are provided with damping devices.

[0173] Accessories 316 Fig.25A and Fig.25B Corresponding to accessory 116 Fig.14A and 14BWhile fitting 316 similarly provides a mechanism for controlling the one-way flow of gas or ambient air into a liquid container, the mechanism includes an inlet 364 and a disc valve 362 rather than an inlet, an inlet disc valve, and a nozzle valve.

[0174] Although the alternative embodiment of the fitting 316 is functionally equivalent to the fitting 116 in many respects, it has its own structural and functional characteristics. First, by using a single needle 319 instead of two separate lines, the fitting 316 only requires a single needle 319 to pierce at one location when engaging the liquid container, rather than piercing at two locations. This can reduce the risk and / or extent of leakage from or around the puncture area. From a manufacturing perspective, using a single needle can increase the robustness of a needle and / or reduce production costs.

[0175] In addition, as discussed above, the damping device (402 / 404) can store energy or pressure when fluid is pumped from the chamber (352 / 354). Then, even when pumping of fluid stops between fluid pumping cycles, the device (402 / 404) can release pressure by extending the pumping of the remaining fluid. This can increase and / or extend the flow rate discharged at the nozzle. Experiments leading to the present invention have demonstrated that the flow rate of liquid discharged from the fitting 316 can be as high as 550 ml (per minute) or at least a feasible range of 350-550 ml / minute.

[0176] It should be understood that some features of the present invention described in the content of separate embodiments for the sake of clarity can be provided in combination in a single embodiment. On the contrary, various features of the present invention described in the content of a single embodiment for the sake of brevity can be provided separately or in any suitable sub-combination. It should be noted that some features of the embodiment are illustrated by way of non-limiting examples. For example, the first embodiment of the liquid delivery accessory 116 of the floor cleaning device can be replaced by the second embodiment of the liquid delivery accessory. In addition, an arrangement having two sealed liquid containers and two fluid cylinders (which can both be operated by a motor) can be provided so that two different fluid streams can be delivered, which are then combined to form a preparation for discharge.

Claims

1. A floor cleaning device comprising a cleaning head portion for engaging a floor surface during cleaning, an upright portion for manipulating movement of the cleaning head portion, a liquid delivery accessory, a handle portion extending from the upright portion, and a sealed liquid storage container, wherein the cleaning head portion includes at least a first nozzle for discharging a cleaning detergent therefrom, wherein: - the liquid delivery fitting defines at least a first channel, - the liquid delivery fitting comprises a first chamber, the first channel allowing fluid communication between the sealed liquid storage container and the first chamber, - a second chamber located adjacent to said first chamber, - the liquid delivery fitting comprises a first conduit allowing liquid to leave from the second chamber to the first nozzle for discharge, and - At least the second chamber comprises a damper for storing pressure when liquid is pumped from the second chamber to the first nozzle and for releasing pressure when liquid is not pumped from the second chamber to the first nozzle.

2. The floor cleaning device of claim 1 , wherein the damper is in the form of an elongated tube, the elongated tube expanding upon receiving a certain amount of fluid when liquid is pumped from the second chamber to the first nozzle, and the elongated tube releasing the amount of fluid by default when liquid is not pumped from the second chamber to the first nozzle.

3. The floor cleaning device of claim 1, wherein the dampener defines a closed end and an open end and is in fluid communication with the second chamber and is suspended from the second chamber.

4. The floor cleaning device according to claim 1, wherein the damper is made of a soft elastic plastic selected from silicone rubber, ethylene propylene diene monomer (EPDM) and thermoplastic polyurethane (TPU).

5. The floor cleaning device according to claim 1, further comprising: - a second nozzle, also for discharging cleaning detergent from said sealed liquid storage container, - a single needle cannula defining the first channel and a second channel separate from the first channel, - a third chamber located adjacent to the first chamber, the second passage allowing gas communication between the third chamber and the sealed liquid storage container, - an inlet that allows ambient air or gas to enter the third chamber and then into the liquid storage container, - a fourth chamber located adjacent to said first chamber, and - a second duct allowing liquid to leave from said fourth chamber towards said second nozzle for discharge.

6. The device according to claim 5, wherein: - the first chamber is provided with a first orifice for fluid communication with the second chamber, and the first orifice is reciprocally closable by a first non-return valve, - the first chamber is provided with a second orifice for fluid communication with the fourth chamber, and the second orifice is reciprocally closable by a second non-return valve, - the second chamber and the fourth chamber are provided with a first spring-loaded valve and a second spring-loaded valve, respectively, for minimizing leakage of liquid from the first conduit and the second conduit, respectively, and The second chamber and the fourth chamber are provided with a first plunger and a second plunger, respectively, which are operable by a motor for pumping fluid from the sealed liquid container to the first and second nozzles, respectively, for discharge.

7. The floor cleaning device according to claim 6, wherein: - the third chamber is provided with a third plunger operable by the one motor for pumping ambient air or gas into the third chamber via the inlet and then into the sealed liquid storage container via the second channel for equalizing the pressure in the sealed liquid container, - the inlet acts as a third one-way valve for controlling the entry of ambient air or gas into the third chamber, and - The third chamber is provided with a fourth one-way valve to control the air or gas to pass from the third chamber to the sealed liquid storage container to balance the pressure in the sealed liquid storage container.

8. The floor cleaning device according to claim 7, wherein: - the liquid delivery accessory comprises a fifth chamber, which accommodates the first, second and third plungers and the one motor, and wherein the fifth chamber comprises a pivotable plate, which is movable by the one motor and is used to actuate alternately on the first, second and third plungers, thereby generating a pumping action; as well as - The cleaning head portion is devoid of any non-return valve for controlling leakage of liquid from the first nozzle and / or the second nozzle when the floor cleaning device is not in use.

9. A liquid delivery accessory for controlling the flow of liquid from a sealed liquid storage container to at least a first nozzle, wherein: - the liquid delivery accessory provides a first channel, - the liquid delivery fitting provides a first chamber, the first channel allowing fluid communication between the sealed liquid storage container and the first chamber, - a second chamber located adjacent to said first chamber, - a first duct allowing liquid to leave from the second chamber towards the first nozzle for discharge, - At least the second chamber comprises a damper for storing pressure when liquid is pumped from the second chamber to the first nozzle and for releasing pressure when liquid is not pumped from the second chamber to the first nozzle.

10. The liquid delivery accessory according to claim 9, comprising: - a single needle cannula defining the first channel and a second channel separate from the first channel, - a third chamber located adjacent to the first chamber, the second passage allowing gas communication between the third chamber and the sealed liquid storage container, and - an inlet allowing ambient air or gas to enter the third chamber and then into the liquid storage container.

11. The liquid delivery accessory according to claim 10, wherein: - the first chamber is provided with a first orifice allowing fluid communication with the second chamber, and the first orifice is reciprocally closable by a first non-return valve, - the second chamber is provided with a second orifice which is reciprocally closable by a second non-return valve for controlling the flow of fluid to the first nozzle, the second chamber is provided with a first plunger operable by a motor for pumping fluid from the sealed liquid storage container via the first channel to the first chamber, then via the first orifice to the second chamber, and then via the second orifice, - the third chamber is provided with a second plunger operable by the one motor for pumping ambient air or gas into the third chamber via the inlet and then into the sealed liquid storage container via the second channel, - the second chamber is provided with a first sub-chamber extending therefrom, and The third chamber is provided with a third one-way valve for controlling the ambient air or gas to enter the third chamber, and a fourth one-way valve for controlling the air or gas from the third chamber to the sealed liquid storage container, so as to balance the pressure in the liquid storage container.

12. The accessory according to claim 11, comprising: - a fourth chamber located adjacent to said first chamber, and - a second conduit allowing liquid to leave from said fourth chamber for a second nozzle, in: - the first chamber is provided with a third orifice allowing fluid communication with the fourth chamber, and the fourth orifice is reciprocally closable by a fifth non-return valve, - the fourth chamber is provided with a fourth orifice which is reciprocally closable by a sixth non-return valve for controlling the flow of fluid to the second nozzle, and - the fourth chamber is provided with a third plunger operable by the one motor for pumping fluid from the liquid storage container to the first chamber via the first conduit for use in the second nozzle.

13. An accessory according to claim 12, comprising a fifth chamber, which accommodates the first, second and third pistons and the one motor, and the fifth chamber includes a pivotable plate, which can be driven by the one motor and is used to actuate alternately on the first, second and third pistons to produce a pumping action.

14. The fitting of claim 13, wherein the first and fifth one-way valves are configured to allow one-way fluid flow from the first chamber to the second chamber and from the first chamber to the fourth chamber, respectively.

15. A floor cleaning device comprising a cleaning head portion for engaging a floor surface during cleaning, an upright portion for manipulating movement of the cleaning head portion, a liquid delivery accessory according to claim 12, a handle portion extending from the upright portion, and the sealed liquid container, wherein the cleaning head portion includes the first nozzle and the second nozzle arranged on laterally opposite ends for discharging liquid forwardly therefrom.

16. The floor cleaning device of claim 15, wherein, in sequence, the sealed liquid storage container, the first passage of the needle tube, the first chamber, the second chamber, the first conduit, and the first nozzle together define a liquid flow path.

17. The floor cleaning device according to claim 15, wherein, in sequence, the sealed liquid storage container, the first passage of the needle tube, the first chamber, the fourth chamber, the second conduit, and the second nozzle together define a liquid flow path.

18. The floor cleaning device of claim 15, wherein, in sequence, ambient air or gas, the inlet, the third chamber, the second passage of the needle tube, and the sealed liquid storage container together define a gas flow path.

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