Flat suction head, flat suction piece having the same, and vacuum cleaner having the flat suction piece

Abstract

This invention provides a flat suction head, comprising a bottom portion close to the ground during cleaning and a front portion with a main suction port. The bottom portion includes a support portion and an auxiliary cleaning portion, the auxiliary cleaning portion having an auxiliary suction port communicating with the main suction port, and the support portion protruding outward relative to the auxiliary cleaning portion. This invention also provides a flat suction component with a flat suction head, comprising a flat suction tube and the aforementioned flat suction head disposed at one end of the flat suction tube. This invention further provides a vacuum cleaner with the above-mentioned flat suction component. By optimizing the suction port setting, an auxiliary suction port is added at the bottom to prevent dust not sucked in by the main suction port from accumulating and remaining uncleaned. The auxiliary suction port added at the bottom, due to the function of the bottom support portion, provides space during operation, effectively sucking in dust from corners, edges, and other corners.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum cleaners, and in particular to a flat suction head of a vacuum cleaner, a flat suction piece having the same, and a vacuum cleaner having the flat suction piece. Background Art

[0002] A vacuum cleaner is a cleaning appliance used to remove dust from floors, carpets, walls, furniture, clothing and various gaps. When performing vacuuming, first turn on the power and rotate the suction motor and fan inside the vacuum cleaner to suck the gas containing dust and other foreign matter into the dust box inside the vacuum cleaner through the suction nozzle, rigid suction tube and suction hose. The gas filtered by the dust bag and other filtering devices is then discharged through the exhaust port to achieve the purpose of cleaning the environment.

[0003] According to the appearance of vacuum cleaners, they can be divided into upright vacuum cleaners, horizontal vacuum cleaners and portable vacuum cleaners, etc. The general structure of a vacuum cleaner includes a vacuum cleaner motor that generates suction from the imported power supply, a suction nozzle, a hose, a filter that forms an air duct system, and a dust collecting part that collects the suctioned objects.

[0004] The vacuum hose is one of the important spare parts of vacuum cleaner products and has become a standardized product. The vacuum hose is usually a straight tube. The tube body can be held by the user. The front end is connected to the nozzle socket of the suction nozzle, and the rear end is connected to the vacuum hose and the vacuum cleaner body through the hose connection port. According to the needs of the vacuuming operation, the vacuum hose can be the same tubes plugged into each other, or the vacuum hose can be made into a telescopic vacuum hose with adjustable length. No matter which vacuum cleaner is used, in order to adapt to different cleaning surfaces or corners, such as tables, chairs, sofas, under the bed, and high places that are not easy to clean, you need to choose nozzles of different shapes and structures, such as conical tip nozzles, square brush head nozzles, flat nozzles, etc.

[0005] The common flat suction nozzle includes a flat suction body; the flat suction body is a hollow structure; one end of the flat suction body is the suction port end, and the other end is a joint; the cross section of the suction port end is a flat square. When designing a long flat suction port for cleaning under furniture (beds, sofas, etc.), since the flat suction needs to be swung left and right with a large amplitude when in use, a lot of garbage will be pushed away by the side of the flat suction and cannot be sucked in by the suction port. Summary of the invention

[0006] The object of the present invention is to provide a flat suction nozzle which is easy to clean and has high cleaning efficiency.

[0007] Another object of the present invention is to provide a flat adsorption member which has high cleaning efficiency and is easy to operate so as to achieve cleaning in various ways.

[0008] Another object of the present invention is to provide a vacuum cleaner that can achieve cleaning in multiple ways.

[0009] In order to achieve the above-mentioned purpose of the invention, the present invention provides a flat suction head, including a bottom close to the ground during cleaning and a front part with a main suction port, the bottom includes a supporting part and an auxiliary cleaning part, the auxiliary cleaning part is provided with an auxiliary suction port connected to the main suction port, and the supporting part protrudes outward relative to the auxiliary cleaning part.

[0010] As a further improvement of an embodiment of the present invention, the flat suction head has a suction direction parallel to the bottom and a lateral direction parallel to the bottom and perpendicular to the suction direction, the supporting part and the auxiliary cleaning part are arranged along the lateral direction of the flat suction head, the supporting part is located in the middle, and the auxiliary cleaning part is arranged on both sides of the supporting part.

[0011] As a further improvement of an embodiment of the present invention, the cross-section of the flat suction head is V-shaped or arc-shaped.

[0012] As a further improvement of an embodiment of the present invention, the auxiliary suction port includes two narrow and long openings arranged along the suction direction, and the two narrow and long openings are respectively arranged in the auxiliary cleaning part on both sides of the support part.

[0013] As a further improvement of an embodiment of the present invention, wool strips are respectively arranged on the outer sides of the two narrow and long openings.

[0014] As a further improvement of an embodiment of the present invention, the support portion is provided with a groove recessed toward the inside of the flat suction head, and a wool strip is arranged in the groove.

[0015] As a further improvement of an embodiment of the present invention, a wool strip is arranged around the main suction port.

[0016] As a further improvement of an embodiment of the present invention, a wool strip is arranged around the edge of the end portion of the flat suction head where the main suction port is arranged.

[0017] As a further improvement of an embodiment of the present invention, the end of the flat suction head where the main suction port is arranged is constructed as a surface with a high middle and low ends, and the main suction port is arranged in the middle of the end of the flat suction head.

[0018] The present invention further relates to a flat suction piece, comprising a flat suction straw, wherein the flat suction piece further comprises a flat suction head as described in any of the above embodiments and arranged at one end of the flat suction straw.

[0019] As a further improvement of an embodiment of the present invention, the flat adsorption member also includes a rotating mechanism connected to the other end of the flat suction tube, the rotating mechanism includes a rotating tube connected to the flat suction tube, the flat suction tube is pivotally connected to the rotating tube and the pivot axis therebetween is at an angle to the central axis of the two.

[0020] As a further improvement of an embodiment of the present invention, the rotating mechanism further includes a rotating locking mechanism sleeved on the rotating tube, and the rotating locking mechanism can be operated to limit or allow the flat straw to rotate relative to the rotating tube.

[0021] As a further improvement of an embodiment of the present invention, the rotation locking mechanism includes an operating sleeve sleeved on the rotating tube and an elastic element arranged between the rotating tube and the operating sleeve, wherein the operating sleeve cooperates with the flat straw under the action of the elastic element to limit the rotation of the flat straw relative to the rotating tube, and the operating sleeve can overcome the action of the elastic element and disengage from the flat straw to allow the flat straw to rotate relative to the rotating tube.

[0022] As a further improvement of an embodiment of the present invention, the flat straw comprises an inner tube and an outer tube which are sleeved together, and the inner tube can be extended from the outer tube or retracted into the outer tube.

[0023] The present invention also relates to a vacuum cleaner, comprising a body, a dust collecting component connected to the body, and a fan accommodated in the body, wherein the body has an air inlet connected to the outside, and the fan is used to introduce external fluid into the dust collecting component from the air inlet and discharge it after filtering, and the air inlet is detachably installed with a flat adsorption piece as described in any of the previous embodiments.

[0024] The beneficial effects of the present invention are as follows: From the above technical solutions, it can be seen that the present invention has many outstanding substantive technical features. After the implementation of the technical solution of the present invention, its significant technical progress is mainly reflected in: by optimizing the suction port setting, an auxiliary suction port is added at the bottom to prevent the dust not sucked in by the main suction port from being accumulated and not being cleaned. The auxiliary suction port added at the bottom has space left during operation due to the function of the bottom support part, which can effectively suck in dust at the edges such as corners and corners. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a three-dimensional schematic diagram of a flat adsorption member in a preferred embodiment of the present invention;

[0026] Figure 2 yes Figure 1 A schematic diagram of the flat adsorption part rotating to another state;

[0027] Figure 3 yes Figure 1 A top view of the flat adsorption member in FIG.

[0028] Figure 4 yes Figure 1 A bottom view of the flat adsorption member in FIG.

[0029] Figure 5 yes Figure 1 A front view of the flat adsorption part;

[0030] Figure 6 yes Figure 1 A cross-sectional schematic diagram of the rotating mechanism of the flat adsorption member in the embodiment of the present invention is in a state of restricted rotation;

[0031] Figure 7 yes Figure 1 A cross-sectional schematic diagram of the rotating mechanism of the flat adsorption member in the embodiment of the present invention is in a state where rotation is allowed;

[0032] Figure 8 yes Figure 1 A three-dimensional schematic diagram of the flat suction head portion of the medium flat suction piece;

[0033] Fig. 9 yes Figure 8 Schematic diagram of the decomposition of the flat suction tip;

[0034] Fig.10 yes Figure 8 A front view of the flat suction tip;

[0035] Fig.11 It is a schematic diagram of another structural form of a flat suction head in a preferred embodiment of the present invention;

[0036] Fig.12 It is a schematic diagram of another structural form of the flat suction head in a preferred embodiment of the present invention;

[0037] Fig.13 It is a schematic diagram of another structural form of the flat suction head in the preferred embodiment of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be described in detail below in conjunction with the embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural or functional changes made by a person skilled in the art based on these embodiments are all within the protection scope of the present invention.

[0039] Please refer to Figures 1 to 5As shown, in a preferred embodiment of the present invention, the flat suction piece includes a flat suction tube 20 and a flat suction head 30 disposed at one end of the flat suction tube 20. The flat suction tube 20 is a hollow structure. The end of the flat suction head 30 is provided with a main suction port 31 connected to the hollow structure. When vacuum cleaning is performed, dust can enter the flat suction tube 20 through the main suction port 31 and then enter the vacuum cleaner body. In this preferred embodiment, the flat suction tube 20 includes a sleeved inner tube 21 and an outer tube 22. The inner tube 21 can extend from the outer tube 22 or retract into the outer tube 22 to achieve the extension and contraction of the flat suction tube 20. A locking mechanism can also be provided between the inner tube 21 and the outer tube 22 to lock the position of the inner tube 21 relative to the outer tube 22. The flat suction head 30 is disposed at one end of the inner tube 21, and the other end of the inner tube 21 is connected to the outer tube 22. The flat suction head 30 and the inner tube 21 can be constructed in one piece, or can be constructed separately and then assembled together, that is, the flat suction head can be formed in one piece with the flat straw, or can be detachably connected to the flat straw.

[0040] Furthermore, in this embodiment, the flat suction piece further includes a rotating mechanism 50 connected to the flat suction tube 20. Specifically, the rotating mechanism 50 is connected to one end of the outer tube 22, and the other end of the outer tube 22 is connected to the inner tube 21. Figure 6 and Figure 7 As shown, the rotating mechanism 50 includes a rotating tube 51 and a rotating locking mechanism. A rotating connecting tube 23 is fixedly provided inside the outer tube 22 connected to one end of the rotating mechanism 50. The outer tube is pivotally connected to the rotating tube 21 through the rotating connecting tube 23, that is, the flat straw 20 is pivotally connected to the rotating tube. As shown in the figure, the rotating tube 51 has a central axis P, which can also be considered as the central axis P of the rotating tube 51. The outer tube 22 is concentrically arranged with the inner tube 21 and has a center line L. The rotating tube 51 and the flat straw 20 can rotate relative to each other. Figure 1 The central axis P is at a preset angle to the center line L, or can be rotated to Figure 2 The position where the central axis P coincides with the center line L. That is, the pivot axis between the flat straw 20 and the rotating tube 51 is at an angle to the center axes of the two. A rotating surface MM is provided between the rotating tube 51 and the outer tube 22 of the flat straw 20, and the pivot axis between the flat straw 20 and the rotating tube 51 is perpendicular to the rotating surface MM. The rotating tube or the flat straw 20 can rotate along the rotating surface MM, and the central axis P of the rotating tube 51 and the center line L of the flat straw 20 are at an angle to the rotating surface MM.

[0041] In addition, the rotation locking mechanism can limit or allow the relative rotation of the rotating mechanism 50 and the flat straw 20. The rotation locking mechanism includes an operating sleeve 52 sleeved on the rotating tube 51 and an elastic element 53 pressing the operating sleeve 52. The elastic element 53 is arranged between the rotating tube 51 and the operating sleeve 52. The operating sleeve 52 can be changed between two states relative to the rotating tube 51, namely, a rotation-restricting state and a rotation-allowing state. An inner convex first rib 521 is arranged inside the operating sleeve 52, and an outer convex second rib 511 is arranged outside the rotating tube 51. The elastic element 53 is located between the first rib 521 and the second rib 511, that is, the elastic element 53 acts on the rotating tube 51 and the operating sleeve 52 through the first rib 521 and the second rib 511. A convex contact 523 is arranged outside the operating sleeve 52, and a corresponding clamping groove 223 is arranged outside the outer tube 22. When the convex contact 523 of the operating sleeve 51 is clamped in the clamping groove 223 of the outer tube 22, the rotating tube 51 and the flat straw 20 are restricted from relative rotation. In this embodiment, the elastic element 53 is preferably a coil spring. Of course, in other feasible solutions, the elastic element 53 may also be configured as a torsion spring.

[0042] like Figure 6 As shown, in the limited rotation state, the elastic element 53 moves the first convex rib 521 and the second convex rib 511 away from each other, and the operation sleeve 52 keeps the convex contact 523 engaged with the slot 223 of the outer tube 22 under the action of the elastic element 53, so that the outer tube 22 and the rotating tube 51 cannot rotate relative to each other. Figure 7 As shown, in the rotation-allowed state, the operating sleeve 52 is pulled away from the outer tube 22 to overcome the action of the elastic element 53, so that the convex contact 523 of the operating sleeve 52 is released from the clamping groove 223 of the outer tube 22. At this time, the rotating tube 51 rotates relative to the outer tube 22 by 180 degrees, so that the rotating tube 51 has at least two positions relative to the outer tube 22: the central axis P of the rotating tube 51 coincides with the central line L of the outer tube 22 and the central axis P of the rotating tube 51 forms a certain angle with the central line L of the outer tube 22. Therefore, when the user uses it, the flat straw 20 can be attached to the cleaning surface or at a certain angle to the cleaning surface, or swing between the two directions.

[0043] There are many furniture whose bottoms are very close to the cleaning surface, and whose diameters are deep and large. The flat suction head 30 of the flat suction pipe 20 can clean the sides of the furniture and the wall. In order to realize that the dust projected by the furniture on the cleaning surface area can be cleaned, in this embodiment, an auxiliary suction port 36 is preferably provided at the bottom of the flat suction head 30 of the flat suction pipe 20 for cleaning. Specifically, the flat suction head 30 has five solid surfaces, an upper surface 32, a bottom surface, a front surface, and left and right surfaces 33. The bottom surface is functionally divided into a support portion 34 and an auxiliary cleaning portion 35 along a lateral direction parallel to the bottom and perpendicular to the suction direction, wherein the auxiliary suction port 36 is provided on the auxiliary cleaning portion 35, and the support portion 34 protrudes outward relative to the auxiliary cleaning portion 35. Among them, the auxiliary suction port 36 is constructed as a long and narrow opening provided along the direction of suction to increase the dust suction area. When cleaning, dust and garbage on the sides of furniture such as the bed and the wall are first sucked into the main suction port 31 in the front, but more dust attached to the cleaning surface is not sucked into the main suction port 31, so the auxiliary suction port 36 at the bottom of the flat suction head 30 can also assist in dust collection. Because the support portion 34 protrudes from the auxiliary cleaning portion 35, the auxiliary suction port 36 leaves an air intake area and space between the cleaning surface. When cleaning, it does not fit the cleaning surface, leaving space for dust collection, and dust is more easily sucked in.

[0044] Preferably, in order to further improve the dust collection efficiency of the auxiliary suction port 36, in this embodiment, preferably, the support portion 34 is arranged in the middle of the left and right sides of the bottom of the flat suction head, and the auxiliary cleaning portion 35 is respectively arranged on both sides of the support portion 34, that is, the bottom is high in the middle and low on both sides, that is, the bottom surface is divided into three parts, the left half of the bottom surface, the middle part of the bottom surface and the right half of the bottom surface, the middle part of the bottom surface constitutes the support portion 34, and the left half of the bottom surface and the right half of the bottom surface constitute the auxiliary cleaning portion 35. The inner tube 21 of the flat suction tube 20 is flat, and the middle part of the bottom surface of the flat suction head 30 should protrude from the outer surface of the inner tube 21. The auxiliary suction port 36 is respectively arranged on the auxiliary cleaning portion 35 on both sides, that is, the auxiliary suction port 36 includes the left half suction port and the right half suction port of the bottom. When the flat suction head 30 is swung left and right, the dust on both sides of the support portion 34 can be sucked in from the auxiliary suction ports 36 on both sides, so that the dust at the bottom of the furniture can be cleaned more cleanly.

[0045] Further, see Figures 8 to 10As shown, the end of the flat suction head 30 where the main suction port 31 is provided is constructed as a surface with a high middle and low ends, and the main suction port 31 is provided in the middle of the end of the flat suction head 30. There is an inwardly concave groove 341 on the middle part of the bottom surface, i.e., the support part 34. The left half of the bottom surface on both sides of the middle part of the bottom surface and the right half of the bottom surface, i.e., the auxiliary cleaning parts 35 on both sides of the support part 34, are inclined surfaces with the same inclination, so that two side surfaces are added to the bottom. The cross-sectional shape of the bottom is similar to an arc or a V-shape, i.e., the bottom is high in the middle and low on both sides, so that an air intake area and space are left between the left and right suction ports and the ground, which can avoid that when vacuuming, the dust is pushed away by the side of the flat suction head when the flat suction head is swung left and right because the ground suction port is close to the ground and cannot be sucked in. A wool strip 342 is placed in the groove 341 in the middle part of the bottom surface. When cleaning, the flat suction head 30 is swung left and right, and the wool strip 342 in the middle part of the bottom pushes the unsucked dust, and the dust is sucked in from the auxiliary suction ports 36 in the left and right halves of the bottom, thereby increasing the cleaning effect.

[0046] like Fig.11 As shown, in another structural form of the flat suction head 30a, a wool strip 352 is placed on the left half of the bottom surface and the right half of the bottom surface, i.e., the auxiliary cleaning portion 35. Preferably, the wool strip 352 is arranged on the outside of the auxiliary suction port 36, where the side facing the support portion 34 is the inner side of the auxiliary suction port 36, and the opposite side is the outer side, so that the dust that is not sucked in can also be cleaned by the wool strip 352.

[0047] like Fig.12 As shown, in another structural form of the flat suction head 30b, a circle of wool strips 311 can be added around the main suction port 31 on the front surface, that is, the wool strips 311 are arranged around the main suction port 31. Adding wool strips around the suction port 31 can suck in the dust that has not been cleaned again.

[0048] like Fig.13 As shown, in another structural form of the flat suction head 30c, a wool strip 312 is added to the front end surface of the flat suction head 30c, that is, the wool strip 312 is arranged around the peripheral edge of the end of the main suction port 31, which can also suck in the dust that has not been cleaned again.

[0049] In the above embodiment, by optimizing the suction port setting, an auxiliary suction port is added at the bottom to prevent the dust not sucked in by the main suction port from being accumulated and not being cleaned. The auxiliary suction port added at the bottom has space left during operation due to the function of the bottom support part, and can effectively suck in dust at edges such as corners and corners.

[0050] The present invention also relates to a vacuum cleaner having the above-mentioned flat adsorbent, which includes a body, a dust collecting assembly connected to the body, and a fan contained in the body. The body has an air inlet connected to the outside, and the fan is used to introduce external fluid into the dust collecting assembly from the air inlet and then discharge it after filtering. The vacuum cleaner can be of various types, such as vertical, horizontal, and portable, etc. The flat adsorbent can also be detachably connected to the air inlet through a hose, and the detachable connection method can be threaded tightening, snap connection, plug-in, etc. The fan of the vacuum cleaner can be powered by a battery pack or an AC power supply.

[0051] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0052] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A flat suction head (30), comprising a bottom portion close to the ground during cleaning and a front portion provided with a main suction port (31), characterized in that: The surface of the bottom portion comprises a left half, a middle portion and a right half, the middle portion constituting a support portion (34), the left half and the right half constituting an auxiliary cleaning portion (35), the auxiliary cleaning portion (35) being provided with an auxiliary suction port (36) communicating with the main suction port (31), the support portion (34) protruding outwardly relative to the auxiliary cleaning portion (35), so that dust on both sides of the support portion (34) can be sucked in through the auxiliary suction ports (36) on both sides; The cross-section of the bottom is V-shaped. When cleaning, the flat suction head (30) is swung left and right, and the wool strip (342) in the middle part of the bottom pushes the dust that has not been sucked in, and the dust is sucked in from the auxiliary suction ports (36) in the left and right parts of the bottom.

2. The flat suction head (30) according to claim 1, characterized in that: The flat suction head (30) has an air suction direction parallel to the bottom and a lateral direction parallel to the bottom and perpendicular to the air suction direction; the support portion (34) and the auxiliary cleaning portion (35) are arranged along the lateral direction of the flat suction head (30); the support portion (34) is located in the middle, and the auxiliary cleaning portion (35) is arranged on both sides of the support portion (34).

3. The flat suction head (30) according to claim 2, characterized in that: The auxiliary suction port (36) comprises two long and narrow openings arranged along the air suction direction, and the two long and narrow openings are respectively arranged on the auxiliary cleaning part (35) on both sides of the support part (34).

4. The flat suction head (30) according to claim 3, characterized in that: Wool strips (352) are respectively arranged on the outer sides of the two narrow and long openings.

5. The flat suction head (30) according to claim 2, characterized in that: The support portion (34) is provided with a groove (341) recessed toward the inside of the flat suction head (30), and a wool strip (342) is arranged in the groove (341).

6. The flat suction head (30) according to claim 1, characterized in that: A wool strip (311) is arranged around the main suction port (31).

7. The flat suction head (30) according to claim 1, characterized in that: A wool strip (313) is arranged at the edge around the end of the flat suction head (30) where the main suction port (31) is arranged.

8. The flat suction head (30) according to claim 1, characterized in that: The end of the flat suction head (30) where the main suction port (31) is arranged is structured as a surface that is high in the middle and low at both ends, and the main suction port (31) is arranged in the middle of the end of the suction head (30).

9. A flat suction piece, comprising a flat suction tube (20), characterized in that: The flat suction piece further comprises a flat suction head (30) as claimed in any one of claims 1 to 8, which is arranged at one end of the flat suction tube.

10. The flat adsorption member according to claim 9, characterized in that: The flat suction piece further comprises a rotating mechanism (50) connected to the other end of the flat suction tube, the rotating mechanism (50) comprising a rotating tube (51) connected to the flat suction tube, the flat suction tube and the rotating tube (51) being pivotally connected, and a pivot axis between the two forms an angle with the central axis of the two.

11. The flat adsorption member according to claim 10, characterized in that: The rotating mechanism (50) further comprises a rotating locking mechanism sleeved on the rotating tube (51), wherein the rotating locking mechanism can be operated to restrict or allow the flat straw (20) to rotate relative to the rotating tube (51).

12. The flat adsorption member according to claim 11, characterized in that: The rotation locking mechanism comprises an operating sleeve (52) sleeved on the rotating tube (51) and an elastic element (53) arranged between the rotating tube (51) and the operating sleeve (52); the operating sleeve (52) cooperates with the flat straw (20) under the action of the elastic element (53) to limit the rotation of the flat straw (20) relative to the rotating tube (51); and the operating sleeve (52) can overcome the action of the elastic element (53) to disengage from the flat straw (20) to allow the flat straw (20) to rotate relative to the rotating tube (51).

13. The flat adsorption member according to claim 9, characterized in that: The flat straw (20) comprises an inner tube (21) and an outer tube (22) which are sleeved together, and the inner tube (21) can be extended from the outer tube (22) or retracted into the outer tube (22).

14. A vacuum cleaner, comprising a body, a dust collecting assembly connected to the body, and a fan contained in the body, wherein the body has an air inlet connected to the outside, and the fan is used to introduce external fluid into the dust collecting assembly through the air inlet and then discharge it after filtering, characterized in that: The air inlet is detachably mounted with a flat adsorption piece as claimed in any one of claims 9 to 13 .

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