Floor squeegee

Abstract

The present invention provides a floor squeegee that can maintain a negative pressure within the squeegee in a state suitable for suction, regardless of the speed of movement. [Solution] The device includes an upper end portion 3 that is longer horizontally than vertically and has a suction port 4 that communicates with a suction hose, a first shielding portion 11 that hangs down from the front edge of the upper end portion, and a second shielding portion 12 that hangs down from the rear edge of the upper end portion. The first and second shielding portions are provided with a plurality of blade portions 1 and opening / closing portions 2 alternately in the widening direction, and are formed such that when moved forward or backward along the floor surface, the opening / closing portions deform more than the blade portions, and the amount of deformation increases in proportion to the speed of movement.

Description

[Technical Field]

[0001] The present invention relates to a floor squeegee that is attached to the end of a suction hose of a suction device used to suck up water accumulated on a floor surface. [Background technology]

[0002] At building construction sites, flooding of the floor due to inflowing rainwater can hinder work. Therefore, multiple workers are mobilized to periodically change the water. In such cases, a hand-operated floor work machine, such as the one disclosed in Patent Document 1, may be used.

[0003] The squeegee (suction head) of such floor-level suction devices is designed to be operated by a person, like a hand-pushed machine, and has a small slit structure to provide high suction performance at relatively low movement speeds.

[0004] For example, Patent Document 2 discloses a squeegee for a floor cleaning machine that has two flexible, plate-shaped blades attached that can adhere closely to the uneven surface of the floor. The tips of the blades of this squeegee are provided with notches or slits to adjust the negative pressure inside the space between the two blades, i.e., the amount of water suctioned. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2010-29600 [Patent Document 2] Japanese Patent Publication No. 2009-261490 [Overview of the project] [Problems that the invention aims to solve]

[0006] However, when such a squeegee is attached to a suction device mounted on a mobile robot that moves at a relatively high speed, water accumulates in front of the blade, making it difficult to suction efficiently.

[0007] To solve this problem, for example, if the slit is made larger, when the travel speed is reduced, too much air will flow in through the gap, making it impossible to maintain the negative pressure inside the squeegee, and thus reducing the suction efficiency.

[0008] Therefore, the present invention aims to provide a floor squeegee that can maintain a negative pressure inside the squeegee in a state suitable for suction, regardless of the speed of movement. [Means for solving the problem]

[0009] To achieve the above objective, the floor squeegee of the present invention is a floor squeegee attached to the tip of a suction hose of a suction device for sucking up water accumulated on a floor surface, and comprises an upper end provided with a suction port communicating with the suction hose and formed such that the width in the widening direction is longer than the length in the front-rear direction, a first shielding portion hanging down from the front edge of the upper end, and a second shielding portion hanging down from the rear edge of the upper end, wherein the first shielding portion and the second shielding portion are alternately provided with a plurality of blade portions and opening / closing portions in the widening direction, and is characterized in that when moved forward or backward along the floor surface, the opening / closing portions deform more than the blade portions, and the amount of deformation increases in proportion to the speed of movement.

[0010] Here, the opening and closing section can be configured to have less bending rigidity than the blade section. For example, the opening and closing section can be configured such that there is a point in the height direction where the cross-sectional width in the front-to-back direction of the opening and closing section is smaller than the cross-sectional width of the blade section. Alternatively, the material of the opening and closing section can be configured to have less hardness than the material of the blade section.

[0011] Another invention of a floor squeegee is a floor squeegee attached to the tip of a suction hose of a suction device that sucks water accumulated on a floor surface, wherein an upper end portion provided with a suction port communicating with the suction hose is formed such that a lateral width in a width-expanding direction is longer than a longitudinal width in the front-rear direction, a first shield portion suspended from a front edge of the upper end portion, and a second shield portion suspended from a rear edge of the upper end portion, wherein the first shield portion and the second shield portion are formed by a main body portion expanding in the width-expanding direction and an opening-closing mechanism portion provided at a lower portion of the main body portion, the opening-closing mechanism portion is formed such that side edges of adjacent flexible plates overlap when closed, and the flexible plate is formed such that a side edge of the flexible plate opposite to a side edge connected to the main body portion opens when the squeegee is moved forward along the floor surface. [Effects of the Invention]

[0012] In the floor squeegee of the present invention configured as described above, the first shield portion and the second shield portion suspended from front and rear edges of the upper end portion communicating with the suction hose have a configuration in which a plurality of blade portions and opening-closing portions are alternately provided.

[0013] When the floor squeegee is moved forward or backward along the floor surface, the opening-closing portion is formed to have a larger deformation amount than the blade portion. The difference in deformation amount between the blade portion and the opening-closing portion increases correspondingly as the moving speed increases.

[0014] In short, the size of the gap between the opening-closing portion and the blade portion changes depending on the moving speed. Deformation of the opening-closing portion and the blade portion is caused by frictional force with the floor surface during movement and viscous resistance of water, so it can be said that the slit size of the squeegee is automatically adjusted, and the negative pressure inside the squeegee can be maintained in a state suitable for suction regardless of the moving speed. [Brief Description of the Drawings]

[0015] [Figure 1] It is an explanatory diagram showing the configuration of the floor squeegee according to the present embodiment. [Figure 2A]It is a perspective view illustrating the overall configuration of a suction device to which a floor squeegee is attached. [Figure 2B] It is a perspective view illustrating another configuration of a suction device to which a floor squeegee is attached. [Figure 3] It is a side view illustrating details of the floor squeegee according to the present embodiment. [Figure 4] It is an explanatory diagram illustrating combinations of various applicable cross-sectional shapes of an opening / closing part and a blade part. [Figure 5] It is an explanatory diagram showing the movement of the opening / closing part of the floor squeegee according to the present embodiment. [Figure 6] It is an explanatory diagram showing a calculation example of the deformation amounts of the blade part and the opening / closing part that change depending on the moving speed. [Figure 7] It is a diagram illustrating the configuration of the floor squeegee of Example 1, where (a) is a front view and (b) is a cross-sectional view taken along the line A-A in (a). Mode for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figure 1 is an explanatory diagram showing the configuration of the floor squeegee 10 according to the present embodiment. Figures 2A and 2B are perspective views illustrating the overall configuration of a suction device M to which the floor squeegee 10 is attached.

[0017] The floor squeegee 10 of the present embodiment is a suction head attached to the tip of a suction hose of a suction device that sucks water accumulated on a floor surface. The suction device is used for water replacement work and the like to remove water accumulated on a floor at construction sites of buildings and the like.

[0018] The suction device to which the floor squeegee 10 of the present embodiment is attached may be a suction device manually pushed by an operator, or may be a suction device that travels automatically. The automatically traveling suction device may be the suction device M mounted on a carriage T1 towed by an automatic traveling vehicle T as shown in Figure 2A, or may be the suction device M mounted on a mobile robot R as shown in Figure 2B.

[0019] The suction devices M illustrated in Figures 2A and 2B are suction devices M mounted on a trolley T1 or a mobile robot R. The trolley T1 is equipped with wheels for being towed by an autonomous vehicle T, which is a robot that moves automatically. On the other hand, the mobile robot R is a self-propelled device equipped with means of propulsion such as crawler tracks, wheels, and drive motors.

[0020] The suction device M mounted on the trolley T1 or mobile robot R mainly consists of a vacuum M1 and a tank M2 for collecting the water sucked up by the vacuum M1. The operation of the vacuum M1 is controlled by a control unit M3.

[0021] The attachments of the suction device M, including the vacuum M1, and the control unit M3 are powered by electricity stored in a battery (not shown) located inside the enclosure in which the control unit M3 is housed.

[0022] The vacuum M1 has a connection port M11 that serves as a suction port. As shown in Figures 2A and 2B, one end of the suction hose M12 is connected to the connection port M11 of the vacuum M1, and the other end is connected to the suction port 4 of the floor squeegee 10.

[0023] The floor squeegee 10 of this embodiment is positioned to protrude from the front wheels of the trolley T1 or the mobile robot R. As shown in Figure 1, the floor squeegee 10 includes an upper end portion 3 provided with a suction port 4 that communicates with the suction hose M12, a first shielding portion 11 hanging down from the front edge of the upper end portion 3, and a second shielding portion 12 hanging down from the rear edge of the upper end portion 3.

[0024] The upper end portion 3 is formed, for example, in a plate shape, such that its width in the widening direction B2 is longer than its vertical width in the front-to-back direction B1. For example, the upper end portion 3 can be manufactured from a rectangular plate or a strip-shaped plate in plan view.

[0025] Protective rollers 5 are attached to both ends of the upper end portion 3 in the widening direction B2. The protective rollers 5 are attached so that a portion of them protrudes from the upper end portion 3, preventing the upper end portion 3 from coming into direct contact with walls or obstacles and being damaged.

[0026] Since an opening connected to the suction port 4 is provided on the lower side of the upper end portion 3, a near-vacuum can be created by enclosing the lower part of the upper end portion 3 and using the suction of the vacuum M1. However, in order to draw up water with the vacuum M1, it is necessary to take in a certain amount of air and mix it with the water. For this reason, an air hole is provided in the upper end portion 3, or the sides of the upper end portion 3 are left open.

[0027] In the floor squeegee 10 described in this embodiment, as shown in Figures 1 and 3, the space between the edges of the first shielding portion 11 and the second shielding portion 12, which are arranged parallel to each other with a gap in the front-to-back direction B1 (below the short side of the upper end portion 3) is open. Air can be drawn into the squeegee, which is the space below the upper end portion 3, through this open portion.

[0028] On the other hand, a first shielding section 11 and a second shielding section 12 are provided below the long side of the upper end 3. The lower edges of the first shielding section 11 and the second shielding section 12 are in contact with the floor surface FL when in use. Since the configuration of the first shielding section 11 and the second shielding section 12 is the same, the detailed configuration will be explained below using the first shielding section 11 as an example.

[0029] The first shielding section 11 is provided with multiple blade sections 1 and opening / closing sections 2 alternately in the widening direction B2. That is, an opening / closing section 2 is provided between each blade section 1, 1. Here, since the lower edges of both the blade section 1 and the opening / closing section 2 are in contact with the floor surface FL, when the floor squeegee 10 is moved forward or backward, both will bend and deform due to the frictional resistance generated between them and the floor surface FL.

[0030] The direction in which the blade section 1 and the opening / closing section 2 flex changes depending on the direction of movement of the floor squeegee 10, and the amount of deformation changes with the speed of movement. Regardless of the speed of movement, the amount of deformation of the opening / closing section 2 is greater than the amount of deformation of the blade section 1.

[0031] In other words, since the opening / closing section 2 deforms more than the blade section 1, even if the blade section 1 and the opening / closing section 2 are in close contact with no gap when stopped, an increase in the moving speed will create a gap between the adjacent opening / closing section 2 and the blade section 1. In this embodiment, the presence or absence of such a gap is referred to as opening and closing.

[0032] As shown in Figure 3, in the first shielding section 11, which is forward in the direction of movement, the opening / closing section 2 bends more than the blade section 1, creating a gap between the adjacent blade section 1 and the opening / closing section 2.

[0033] On the other hand, on the side of the second shielding section 12 adjacent to the trolley T1 and the front wheels of the mobile robot R, the amount of deformation of the opening / closing section 2 between the blade sections 1,1 is smaller than that of the opening / closing section 2 of the first shielding section 11. The details of the floor squeegee 10 of this embodiment, including the reasons for these movements, will be explained below.

[0034] As described above, the blade section 1 and the opening / closing section 2 are made of a flexible material and can be easily deformed. For example, natural rubber, synthetic rubber, chloroprene rubber, polypropylene rubber, silicone rubber, etc., can be used as materials.

[0035] Furthermore, the opening / closing section 2 has lower bending stiffness (EI) compared to the blade section 1. Here, E represents Young's modulus and I represents the second moment of area. In other words, to reduce the bending stiffness of the opening / closing section 2, one must either use a material with a smaller Young's modulus E than the blade section 1, reduce the cross-section (second moment of area I), or adjust it by both.

[0036] Figure 4 is an explanatory diagram illustrating various applicable cross-sectional shape combinations for the opening / closing section 2 and the blade section 1. In this figure, the length from the upper end 3 downwards is defined as position x, which represents the height. The cross-sectional width (thickness in the front-to-back direction B1) at position x of the blade section 1 and the opening / closing section 2 is defined as cross-sectional width h1(x)[m] for the blade section 1 and cross-sectional width h2(x)[m] for the opening / closing section 2.

[0037] In all six combinations of blade section 1 and opening / closing section 2 shown in Figure 4, there exists a position x that satisfies h1(x)≧h2(x) and h1(x)>h2(x). That is, when comparing the second moment of area I1 of blade section 1 and the second moment of area I2 of opening / closing section 2, I1>I2.

[0038] Figure 4(a) shows the most standard combination, where the cross-sectional widths of the blade section 1 and the opening / closing section 2 are constant regardless of the height (position x), and the cross-sectional width h2(x) of the opening / closing section 2 is smaller. Figure 4(b) shows an example where only the lower half of the opening / closing section 2 has a reduced cross-sectional width h2(x).

[0039] In contrast, Figure 4(c) shows an example where the cross-sectional width h2(x) of the upper half of the opening / closing section 2 is reduced, while the lower part has the same width as the blade section 1. On the other hand, Figure 4(d) shows an example where the cross-sectional width h2(x) of the center of the opening / closing section 2 is reduced.

[0040] Figure 4(e) shows an example of asymmetry, where the center of one side of the opening / closing section 2 is formed as a recessed curved surface. Figure 4(f) shows that the cross-sectional width h2(x) of the opening / closing section 2 tapers continuously downwards.

[0041] As shown in FIG. 4, if there exists a position x satisfying h1(x)>h2(x) in the relationship between the blade portion 1 and the opening / closing portion 2, the materials of the blade portion 1 and the opening / closing portion 2 may be the same. On the other hand, when the second moment of area I2 of the opening / closing portion 2 is set to be equal to or less than the second moment of area I1 of the blade portion 1, it is necessary to select a material in which the Young's modulus E2 of the opening / closing portion 2 is smaller than the Young's modulus E1 of the blade portion 1. For example, for the opening / closing portion 2, a material having a lower hardness (for example, according to JIS K6253) than that of the blade portion 1 is selected.

[0042] FIG. 5 is an explanatory diagram showing the movement of the opening / closing portion 2 of the floor squeegee 10 according to the present embodiment. When the floor squeegee 10 moves at a movement speed V [m / s] in the movement direction indicated by the arrow along with the travel of the trolley T1 or the mobile robot R, water accumulated forward acts as resistance, and a rearward-directed force F1 [N] acts on the opening / closing portion 2 of the first shielding portion 11.

[0043] where ρ is the density of water w [kg / m 3 , t [m] is the height at which the first shielding portion 11 contacts water (that is, the forward water level), and C is the shape factor D , F1 [N] is given by the following formula. F1(V)=1 / 2·ρ w ·V 2 ·t·C D

[0044] Here, the shape factor C D is a coefficient determined by the shape of an object. A rectangular parallelepiped tends to have a larger value than a cylinder, and the shape factor C of the opening / closing portion 2 and the blade portion 1, which are shaped as a rectangular parallelepiped or a shape similar thereto, D is a relatively large value.

[0045] Further, during movement, the blade portion 1 and the opening / closing portion 2 are acted on by a frictional force F2 [N] with the floor surface FL and a force F3 [N] generated by suction in a clockwise direction when viewed in FIG. 5. At this time, for example, in the combination of cross-sectional shapes shown in FIG. 4(a), the deformation amount δ at the tip (x=l) of the blade portion 1 (i=1) and the opening / closing portion 2 (i=2) i(i=1,2)[m] is given by the following equation.

[0046]

number

[0047] Here, since the opening / closing section 2 has less bending rigidity than the blade section 1, the following state is obtained from the above equation. δ1 < δ2 In this way, a difference in deformation (δ2-δ1) occurs between the blade section 1 and the opening / closing section 2, allowing water to flow into the squeegee through the gap.

number

[0048] From the calculation formula for F1(V) described above and the equation above, it can be seen that the difference in deformation (δ2-δ1) is proportional to the square of the movement speed V of the floor squeegee 10. In other words, the larger the movement speed V of the floor squeegee 10, the larger the difference in deformation (δ2-δ1), and therefore the greater the amount of water that can flow in.

[0049] Conversely, when the movement speed V of the floor squeegee 10 is small, the difference in deformation (δ2-δ1) becomes small, which prevents the inflow of excess air and maintains a constant negative pressure inside the squeegee, thus preventing a decrease in suction efficiency.

[0050] Furthermore, in the rear second shielding section 12, as shown in Figure 5, the frictional force F2 with the floor surface FL acts in a clockwise direction, while the force F3 generated by suction acts in a counterclockwise direction. As a result, deformation of the blade section 1 and the opening / closing section 2 is less likely to occur, and the difference in the amount of deformation (δ2-δ1) is also reduced.

[0051] By reducing the gap in the second shielding section 12 in this way, water that flows in through the gap in the first shielding section 11 can remain inside the squeegee and be prevented from leaking out to the rear. In other words, water taken into the squeegee from the floor surface FL can be sucked up without leaving any behind the floor squeegee 10.

[0052] Thus, the operation of the opening / closing section 2 does not require an actuator or the like, and the amount of opening and closing of the gap is passively adjusted by the forces (F1, F2, F3) acting on the first shielding section 11 and the second shielding section 12. Furthermore, in the floor squeegee 10 of this embodiment, the first shielding section 11 and the second shielding section 12 have the same configuration, so even if the direction of movement is reversed and the second shielding section 12 is facing forward, the amount of opening and closing of the gap is adjusted in the same way.

[0053] Next, a specific example of the floor squeegee 10 of this embodiment will be described. In a specific example, we will explain the case where the material of the blade section 1 and the opening / closing section 2 are the same (E1=E2), but the cross-sectional shapes are different (I1>I2).

[0054] The blade section 1 and the opening / closing section 2 shall be made of natural rubber (hardness: 45, Young's modulus: 0.001 GPa, tensile strength: 16.1 MPa). The suction device M to be used shall be SGV-110A-PC (manufactured by Suiden Co., Ltd., airflow: Q=2.6 / 60m³). 3 (Vacuum pressure: 30kPa)

[0055] Furthermore, the gravitational acceleration g used in the calculations described later is 9.81 m / s². 2 ρ, the density of water w is 997 kg / m 3 , air density ρ a is 1.293 kg / m 3 On the other hand, the length w of the widening direction B2 of the first shielding section 11 and the second shielding section 12 is 1.0 m, and the height l of the blade section 1 and the opening / closing section 2 is 0.03 m.

[0056] Furthermore, the cross-sectional width h1 of the blade section 1 is 0.008 m, and the cross-sectional width h2 of the opening / closing section 2 is 0.005 m. Then, the shape coefficient C of the blade section 1 and the opening / closing section 2 is... DLet's assume it's 2.0. Regarding the frictional force between the blade 1 and the concrete floor surface FL, since the coefficient of friction μ between a tire and concrete is generally considered to be 0.4 to 0.8, and the floor surface FL is wet during water change work, we will assume the coefficient of friction μ is 0.5 here.

[0057] Assuming the total weight W of the floor squeegee 10 is 0.5 kg, the frictional force F2 generated between it and the floor surface FL shown in Figure 5 can be calculated using the following formula. F2 = μWg = 2.45

[0058] The vacuum pressure generated during suction by the suction device M creates a mixed flow of water and air in the suction hose M12. In an experiment conducted for reference, the amount of water suctioned was approximately 500 ml / s. Compared to the airflow Q of the suction device M, the water-to-air ratio is estimated to be about 1%.

[0059] The dynamic pressure p [N / m2] generated in the opening / closing section 2 at this time can be calculated using the following formula. p=(0.01ρ w +0.99ρ a )u w 2 / 2 Here, u w [m / s] represents the gap (area S) between the blade section 1 and the opening / closing section 2. w [m 2 Q = u w ·S w They are in a relationship.

[0060] Therefore, the suction force F3 shown in Figure 5 can be calculated using the following formula.

number

[0061] The water level t[m] accumulating in front of the first shielding section 11 increases as the movement speed V increases. From the experiment, when the water level accumulated on the floor surface FL is 0.01m, the water level t[m] is given by the following formula. t = 0.02V + 0.01

[0062] On the other hand, when the area ratio of the blade portion 1 and the opening / closing portion 2 of the first shielding portion 11 is 1:1, that is, when the area of ​​the opening / closing portion 2 is 50%, the area S of the gap is w is 0.015[m 2 Assuming this is the case, the deformation amounts (δ1, δ2) of the blade section 1 and the opening / closing section 2 due to the moving speed V were calculated and the results are shown in the table in Figure 6.

[0063] From the table shown in Figure 6, it can be confirmed that the opening / closing section 2 always undergoes significant deformation relative to the blade section 1. For example, when the travel speed V is 0.3 m / s, the difference in deformation between the blade section 1 and the opening / closing section 2 (δ2-δ1) is 2.3 mm.

[0064] Furthermore, when the travel speed V is 1.0 m / s, the difference in deformation between the blade section 1 and the opening / closing section 2 (δ2-δ1) is 9.1 mm. In other words, as the travel speed V increases, the difference in deformation between the blade section 1 and the opening / closing section 2 (δ2-δ1) increases, making it possible to take in more water.

[0065] Conversely, as the movement speed V decreases, the difference in deformation between the blade section 1 and the opening / closing section 2 (δ2-δ1) decreases, preventing the intake of excess air and allowing high suction efficiency to be maintained.

[0066] Next, the operation of the floor squeegee 10 of this embodiment will be described. In this configuration, the floor squeegee 10 has a first shielding section 11 and a second shielding section 12 that hang down from the front and rear edges of the upper end 3 which communicates with the suction hose M12, and each section is provided with multiple blade sections 1 and opening / closing sections 2 alternately.

[0067] Furthermore, when the floor squeegee 10 is moved forward or backward along the floor surface FL, the opening / closing section 2 is formed to deform more than the blade section 1. This difference in deformation between the blade section 1 and the opening / closing section 2 (δ2-δ1) increases as the moving speed V increases.

[0068] In short, the size of the gap between the opening / closing section 2 and the blade section 1 changes depending on the movement speed V. Since the deformation of the opening / closing section 2 and the blade section 1 is caused by the frictional force with the floor surface FL during movement and the viscous resistance of the water, it can be said that the slit size of the squeegee is automatically adjusted.

[0069] For example, if a trolley T1 towed by an autonomous vehicle T or a mobile robot R is equipped with a suction device M, the autonomous vehicle T or mobile robot R can move at high speed in wide areas where suction work is not hindered, but will move at low speed in narrow areas or near obstacles, resulting in a wide range of movement speed V depending on the situation. In addition, the amount of water accumulated on the floor surface FL also varies depending on the site conditions.

[0070] In these situations, if the negative pressure inside the squeegee can be maintained in a state suitable for suction, regardless of the movement speed V or water level, water changes and other tasks can be performed efficiently.

[0071] Furthermore, since the first shielding section 11 and the second shielding section 12 have the same structure, the same effect can be obtained even when the direction of movement is such that the second shielding section 12 is in front. Therefore, there are no restrictions on the direction of movement of the autonomous vehicle T or mobile robot R during work, and they can be driven efficiently. [Examples]

[0072] In this embodiment 1, a floor squeegee 60 of a different embodiment from the floor squeegee 10 described in the above embodiment will be described with reference to Figure 7. Note that parts that are the same as or equivalent to those described in the above embodiment will be described using the same terms or reference numerals.

[0073] The floor squeegee 60 of this embodiment 1 includes an upper end portion 3 provided with a suction port 4 that communicates with a suction hose M12, a first shielding portion 61 hanging down from the front edge of the upper end portion 3, and a second shielding portion (not shown) hanging down from the rear edge of the upper end portion 3.

[0074] Here, the upper end portion 3 is the same as in the previous embodiment, so its explanation will be omitted. Also, since the configuration of the first shielding portion 61 and the second shielding portion are the same, the detailed configuration will be explained below using the first shielding portion 61 as an example.

[0075] As shown in Figure 7(a), the first shielding portion 61 is formed by a main body portion 611 that expands in the widening direction B2 and an opening / closing mechanism portion 612 provided at the lower part of the main body portion 611. The materials of the main body portion 611 and the opening / closing mechanism portion 612 are natural rubber, synthetic rubber, chloroprene rubber, polypropylene rubber, silicone rubber, etc.

[0076] The opening and closing mechanism 612 is formed so that the side edges of the multiple flexible plates 7 overlap when closed. Figure 7(b) is a cross-sectional view showing the state of the flexible plates 7 when opening and closing, which will be described later. One side edge 71 of the flexible plate 7 is fixed to the main body 611 at its upper end, while the other side edge 72 of the flexible plate 7 is detached from the main body 611 and can move freely.

[0077] Furthermore, the other side edge 72 is formed to overlap with the side edge 71 of the adjacent flexible plate 7 located on the right side in Figure 7(b) when closed. In other words, the side edges 71 and 72 of the adjacent flexible plates 7, 7 overlap, thereby closing the opening and closing mechanism 612.

[0078] In contrast, when the floor squeegee 60 is moved forward along the floor surface FL, the side edge 72, which is the free edge of the flexible plate 7 of the first shielding section 61, moves backward due to the frictional force with the floor surface FL and the viscous resistance of water. That is, the flexible plate 7 deforms in the yaw direction around the side edge 71, which is the fixed edge, and a gap opens between the flexible plates 7, 7.

[0079] On the other hand, in the rear second shielding section, even if the side edge 72 of the flexible plate 7 tries to move outward (rearward) of the squeegee due to frictional force with the floor surface FL, it is restricted by the side edge 71 of the adjacent flexible plate 7, so the gap closes and the flexible plates 7, 7 are in close contact with each other. As a result, water that flows in through the gap in the first shielding section 61 remains inside the squeegee and is prevented from leaking out to the rear.

[0080] Similar to the principle described in the above embodiment, the size of the gap between the flexible plates 7, 7 of the first shielding portion 61 when it is on the forward side in the direction of movement increases in proportion to the increase in the movement speed V.

[0081] In other words, regardless of the movement speed V of the floor squeegee 60, the negative pressure inside the squeegee can be maintained in a state suitable for suction. The same effect of the floor squeegee 60 of this embodiment 1 can be obtained even when the second shielding part is in front of the direction of movement.

[0082] Furthermore, the other configurations and effects are substantially the same as those of the above-described embodiment, so their explanation will be omitted.

[0083] While embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments and examples, and any design modifications that do not depart from the spirit of the present invention are included in the present invention.

[0084] For example, in the above embodiment and example 1, the upper end portion 3 was described as a rectangle in plan view with the vertical width being the shorter side and the horizontal width being the longer side, but it is not limited to this, and the upper end portion may have a shape such as a V-shape (boomerang shape) or a curved shape in plan view. [Explanation of symbols]

[0085] 10: Floor squeegee 11: 1st shielding part 12:Second shielding part 1: Blade section 2: Opening / closing part 3: Upper end 4: Suction port 60: Floor squeegee 61: 1st shielding part 611: Main body 612: Opening / closing mechanism 7:Flexible plate 71 :Side edge 72 :Side edge B1:Anteroposterior direction B2: Widening direction FL: Floor surface M: Suction device M12: Suction hose

Claims

1. A floor squeegee that is attached to the end of the suction hose of a suction device that sucks up water accumulated on the floor surface, An upper end is provided with a suction port that communicates with the suction hose, and is formed such that the width in the widening direction is longer than the length in the front-to-back direction, A first shielding portion hangs down from the front edge of the upper end, It comprises a second shielding portion that hangs down from the rear edge of the upper end, The first shielding portion and the second shielding portion are provided with a plurality of blade portions and opening / closing portions alternately in the widening direction, A floor squeegee characterized in that when moved forward or backward along the floor surface, the opening and closing portion deforms more than the blade portion, and the amount of deformation increases in proportion to the speed of movement.

2. The floor squeegee according to claim 1, characterized in that the opening and closing portion is formed to have less bending rigidity than the blade portion.

3. The floor squeegee according to claim 2, characterized in that there exists a location in the height direction at which the cross-sectional width of the opening and closing portion in the front-to-back direction is smaller than the cross-sectional width of the blade portion.

4. The floor squeegee according to claim 2 or 3, characterized in that the material of the opening and closing part has a lower hardness than the material of the blade part.

5. A floor squeegee that is attached to the end of the suction hose of a suction device that sucks up water accumulated on the floor surface, An upper end is provided with a suction port that communicates with the suction hose, and is formed such that the width in the widening direction is longer than the length in the front-to-back direction, A first shielding portion hangs down from the front edge of the upper end, It comprises a second shielding portion that hangs down from the rear edge of the upper end, The first shielding portion and the second shielding portion are formed by a main body portion that expands in the widening direction and an opening / closing mechanism portion provided at the lower part of the main body portion, The opening and closing mechanism is formed such that the side edges of adjacent flexible plates overlap when closed, and when moved forward along the floor surface, the flexible plate is formed so that the side edge opposite to the side edge connected to the main body opens, characterized in that of a floor squeegee.

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