A hook structure and a portable electric appliance

Abstract

This utility model discloses a hook structure and a portable electric appliance, including a first outer shell, comprising a first mounting surface and a hook, the hook having an opening perpendicular to the first mounting surface; and a second outer shell, including a second mounting surface for mating with the first mounting surface; wherein, after the first mounting surface and the second mounting surface are fitted together, the first outer shell and the second outer shell form an integrally symmetrical shell structure, and the hook is located near the plane of symmetry of the shell structure. The hook structure and portable electric appliance of this application facilitate injection molding of the shell, resulting in a smoother hook appearance.

Description

Technical Field

[0001] This utility model relates to the field of portable electric appliances, and more specifically, to a hook structure and a portable electric appliance. Background Technology

[0002] Hook structures, as key components of portable power tools (such as electric drills and angle grinders), are commonly used to suspend tools on workbenches or belts. Their structural strength and surface quality directly affect the user experience. Currently, the industry-standard split-type hook structure suffers from significant quality defects: I. Appearance defects caused by the assembled structure: Traditional designs typically use a symmetrical, split structure for the hook—each of the first and second outer shells has half a hook cavity, which are then assembled to form a complete hook. This structure has two inherent drawbacks: 1. Exposed parting line: The parting line is unavoidable in the center of the hook. This area is prone to flash and misalignment due to injection shrinkage or processing errors, resulting in visual defects and tactile bumps. 2. Cumulative Deformation Effect: The two halves of the hook are prone to asymmetrical shrinkage deformation during injection molding and cooling. After assembly, the deformation is superimposed, causing the hook contour to be distorted and the surface flatness to be difficult to guarantee.

[0003] II. Risk of scratching hands due to assembly errors: The assembly precision of modular hooks is highly dependent on the positioning structure of the outer shell. If there are tolerances in the positioning pins / holes, or if the outer shell is deformed under pressure, a stepped difference will occur at the hook joint. When the user holds the tool, the sharp edges can easily scratch the skin or clothing, posing a safety hazard.

[0004] III. Insufficient structural strength: The joint is located in the stress concentration area of ​​the hook, and it is prone to cracking at the joint when frequently suspended loads, which reduces the product life.

[0005] To alleviate the aforementioned problems, existing technologies attempt to improve processing precision or add post-processing steps (such as grinding seams), but these significantly increase manufacturing costs and cannot fundamentally eliminate structural defects. Therefore, there is an urgent need for a new hook structure that can solve the appearance and quality problems caused by the assembled structure from the design source by optimizing the mold opening position and assembly method. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a hook structure and a portable electric appliance to solve the problems of uneven surface and scratching hands that exist in existing modular hooks.

[0007] To achieve the above objectives, in a first aspect, this application provides a hook structure, comprising: The first housing includes a first mounting surface and a hook, wherein the hook has an opening and the angle between the direction of the opening and the normal of the first mounting surface is less than 90°. The second housing includes a second mounting surface for engaging with the first mounting surface; Wherein, after the first mounting surface and the second mounting surface are attached, the first outer shell and the second outer shell form an overall symmetrical shell structure, and the hook is located near the plane of symmetry of the shell structure.

[0008] Through the above technical solution, the hook is integrally formed into the first outer shell, completely eliminating the seam between the two halves of the hook and effectively solving the risks of flash and misalignment. The hook is located near the symmetrical plane of the shell, which, together with the overall symmetrical shell structure, makes the force on each part of the product more even when suspended, reducing structural damage caused by excessive local force and extending the product's service life.

[0009] In conjunction with the first aspect, a further technical solution is provided: the first housing further includes a third assembly surface, the hook is at least partially located between the first assembly surface and the third assembly surface, and the opening direction is consistent with the demolding direction of the first assembly surface.

[0010] Through the above technical solution, the third assembly surface and the first assembly surface form an isolation buffer zone, so that the assembly pressure is only applied to the non-hooked area of ​​the shell, blocking the hook's deformation path.

[0011] In conjunction with the first aspect, a further technical solution is that the third assembly surface is parallel to the first assembly surface.

[0012] Through the above technical solution, the double parallel assembly surfaces form an equidistant positioning channel, reducing the difficulty of mold processing; the assembly stress is evenly distributed, preventing the hook from tilting due to shell warping.

[0013] In conjunction with the first aspect, a further technical solution is that the included angle between the third assembly surface and the first assembly surface is an acute angle or an obtuse angle, or the third assembly surface is a composite curved surface.

[0014] The above technical solutions adapt to the curved shell contour, improving space utilization; the sharp angle layout enhances the shear strength of the assembly surface and improves the lateral load-bearing stability of the hook.

[0015] In conjunction with the first aspect, a further technical solution is that the side of the hook facing the third assembly surface is coplanar with the third assembly surface.

[0016] Through the above technical solution, the parting surface of the mold can be set on the third assembly surface, so as to achieve a seamless transition between the side of the hook and the boundary of the outer shell, eliminate the step difference, and ensure that there are no protruding edges on the user contact surface, thus completely eliminating the risk of scratching hands.

[0017] In conjunction with the first aspect, a further technical solution is provided that the second housing also includes a fourth assembly surface disposed opposite to the third assembly surface, the fourth assembly surface being used for fitting and assembling with the third assembly surface.

[0018] Through the above technical solution, the double-assembly facets form a dual positioning system, reducing the cumulative assembly error in the hook area and offsetting differences in injection molding shrinkage. The dual positioning system also enhances the stability of the connection between the first and second outer shells, reducing loosening caused by vibration and other factors during use, and improving the overall reliability of the product.

[0019] In conjunction with the first aspect, a further technical solution is provided whereby the first outer shell has a protrusion and the second outer shell has a groove that matches the protrusion, with the protrusion inserted into the groove to achieve positioning and assembly of the first outer shell and the second outer shell.

[0020] Through the above technical solution, the precise fit between the convex and concave grooves achieves three-dimensional zero-gap constraint, the assembly force is transmitted along the extension direction of the protrusion, the stress in the hook area is low, and deformation is prevented. At the same time, the convex and concave groove structure can play a guiding role during assembly, making the assembly process smoother, reducing assembly difficulty, and making it suitable for mass production.

[0021] In conjunction with the first aspect, a further technical solution is that the first mounting surface and the third mounting surface are formed on the outer surface of the protrusion, and the second mounting surface and the fourth mounting surface are formed on the inner surface of the groove.

[0022] Through the above technical solutions, the assembly surface and positioning structure are designed as an integrated unit, shortening the tolerance chain; the groove wall protects the assembly surface from bumps and damage, improving the yield rate.

[0023] In conjunction with the first aspect, a further technical solution is that the shell structure formed by the first shell and the second shell has a mirror-symmetric outline about the plane of symmetry.

[0024] Through the above technical solutions, the outer shell has a largely symmetrical structure, which facilitates internal structure design. The symmetrical appearance eliminates visual discrepancies, enhancing the product's perceived quality. The symmetrical design of the outer shell, with the hooks positioned near the symmetrical plane, results in more reasonable overall force distribution, reducing the risk of the product being carried at an angle.

[0025] Secondly, this application provides a portable electric appliance, including the hook structure of the first aspect.

[0026] The above technical solution addresses the long-standing issue of hooks scratching hands in the power tool industry. The integrated hook design enhances load-bearing capacity, making it suitable for high-frequency, heavy-duty applications such as electric drills, angle grinders, and portable vacuum cleaners. Portable power appliances employing this hook structure have a competitive edge in the market, meeting users' multiple needs for product safety, reliability, and practicality, thus increasing market acceptance.

[0027] In summary, this application has at least one of the following beneficial technical effects: 1. Reduce seam defects: The hook is integrally formed on one side of the shell, eliminating the risk of flash and misalignment at the parting line, and the surface flatness error of the hook under stress can be significantly reduced.

[0028] 2. Eliminate the risk of scratching hands: The hook side is designed to be coplanar with the outer shell, and the convex and concave grooves are precisely positioned to achieve a stepless contact surface.

[0029] 3. Improve structural reliability: The assembly surface isolation design blocks stress transmission, reduces the risk of deformation in the hook area, and improves the load-bearing capacity of the suspension.

[0030] 4. Reduced overall cost: The yield rate of symmetrical shells is significantly improved, eliminating the need for post-processing and polishing. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0032] Figure 1 This is a three-dimensional structural diagram of the hook structure of this application; Figure 2 This is a cross-sectional schematic diagram of the first outer casing of this application; Figure 3 for Figure 2 Enlarged structural diagram of area A in the middle; Figure 4 This is a three-dimensional structural diagram of the second outer shell of this application; Figure 5 for Figure 4 Schematic diagram of the enlarged structure of area B in the middle; Figure 6 This is a three-dimensional structural diagram of the second outer shell of this application from another angle; Figure 7 for Figure 6 Enlarged structural diagram of area C; Figure 8 This is an exploded view of the hook structure in this application; Figure 9 This is a schematic diagram of a vacuum cleaner.

[0033] Figure label: 1. First outer shell; 11. Protrusion; 111. First mounting surface; 112. Third mounting surface; 2. Second outer shell; 21. Groove; 211. Second mounting surface; 212. Fourth mounting surface; 3. Hook; 31. Opening; 4. Front hook; 5. Rear hook; 6. Belt hook. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] The embodiments of this application will now be described in detail with reference to the accompanying drawings. Unless otherwise specified, the features in the following embodiments can be combined with each other.

[0038] Example 1: Please see Figures 1-8 This application provides a hook structure, which is mainly composed of a first outer shell 1 and a second outer shell 2. The first outer shell 1 is provided with a protrusion 11, and the second outer shell 2 is provided with a groove 21. After the two are fastened together, the protrusion 11 is inserted into the groove 21, and the first outer shell 1 and the second outer shell 2 are fixed by screws. A space for placing electric devices is formed between the first outer shell 1 and the second outer shell 2.

[0039] Please see Figures 1-3 The first outer shell 1 has a first mounting surface 111 and a hook 3. The first mounting surface 111 is located on the outer surface of the protrusion 11 facing the second outer shell 2. The hook 3 has an opening 31, and the angle between the direction of the opening 31 and the normal of the first mounting surface 111 is less than 90°. When the first mounting surface 111 is the mold closing surface, the opening 31 is perpendicular to the first mounting surface 111. This opening 31 design not only facilitates the placement and removal of suspended items, but also facilitates the demolding of the opening 31 structure, simplifies mold processing, and reduces mold costs. In addition, this structure has undergone rigorous mechanical calculations and testing to ensure that it can maintain structural integrity even when bearing a large weight. For example, the protrusion 11 and the groove 21 are fastened by a snap or stop structure. When the hook 3 is subjected to outward pulling force, multiple sides of the protrusion 11 can play a role in resisting deformation, and the deformation at the opening 31 of the hook 3 can be controlled within a small range, achieving its reliable structural strength. The first outer shell 1 is made of high-strength engineering plastic, which has advantages such as light weight, high strength, and corrosion resistance. While ensuring the stability of the hook structure, it reduces the overall weight, making the product easier to carry and install. Through a special injection molding process, the surface of the first outer shell 1 is smooth and flat, without obvious defects, which not only improves the product's aesthetics but also reduces stress concentration problems caused by uneven surfaces.

[0040] Furthermore, the first outer shell 1 also includes a third mounting surface 112, which is disposed at the root of the protrusion 11. The hook 3 is at least partially located between the first mounting surface 111 and the third mounting surface 112. That is, the hook 3 can be completely disposed on the protrusion 11, or it can extend from the outside of the protrusion 11 of the first outer shell 1 and partially disposed on the protrusion 11. In some embodiments, the third mounting surface 112 is parallel to the first mounting surface 111. This design provides many practical functions. The double parallel mounting surfaces form equidistant positioning channels, greatly reducing the difficulty of mold processing. During the production process, the manufacturing precision of the mold is easier to control, thereby improving the production efficiency and yield of the product. The parallel mounting surfaces ensure a uniform distribution of assembly stress, preventing the hook 3 from being misaligned due to shell warping. In the actual assembly process, workers can more easily and accurately align the first outer shell 1 and the second outer shell 2, reducing product quality problems caused by improper assembly. In other embodiments, the third assembly surface 112 can be a composite surface composed of planes and curved surfaces. This composite surface can be uniquely designed according to the parting surface of the product, which can not only meet the appearance design requirements, but also achieve the technical effect of this application.

[0041] Please see Figures 4-7The second outer shell 2 is provided with a second mounting surface 211 for engaging with the first mounting surface 111. The second outer shell 2 is provided with a groove 21, and the second mounting surface 211 is located on the inner surface of the groove 21 facing the first outer shell 1. When the first mounting surface 111 and the second mounting surface 211 are tightly fitted, the first outer shell 1 and the second outer shell 2 form an overall symmetrical shell structure. The symmetry mentioned in this application is not absolute symmetry, but rather a general symmetry in the overall structure. This symmetrical design has advantages in several aspects. From an aesthetic point of view, product design aims for symmetrical appearance without visual deviation, enhancing the overall quality of the product. Whether used as a hanging device for small items in a home environment or for hanging tools or parts on an industrial production line, it can be harmoniously matched with the surrounding environment without appearing abrupt. From a mechanical point of view, the symmetrical shell design ensures that the hook 3 is located on the center line of force, resulting in balanced torque during suspension. In actual use scenarios, when suspending irregularly shaped heavy objects, because the hook 3 is located near the plane of symmetry, the overall force is more reasonable, effectively avoiding deformation and cracking caused by excessive force on one side. Through experimental comparison, the service life of the hook 3 with the symmetrical structure is effectively extended compared with the hook 3 with the asymmetrical structure when suspending the same weight.

[0042] The second outer shell 2 also includes a fourth assembly surface 212 disposed opposite to the third assembly surface 112, the fourth assembly surface 212 being used for fitting and assembling with the third assembly surface 112. The mating of the two assembly surfaces forms a dual positioning system, further improving the assembly accuracy of the product. This dual positioning system plays a crucial role in controlling the cumulative assembly error in the hook 3 area, reducing the error to a minimum. Through precise assembly processes, differences in injection molding shrinkage can be effectively offset, ensuring the stability of the hook structure during long-term use. For example, when testing a batch of hook structures that had been used for a long time, it was found that the deformation in the hook 3 area of ​​products using the dual positioning system was significantly reduced compared to products without this system.

[0043] Please see Figure 3 and Figure 7To achieve precise positioning and assembly of the first outer shell 1 and the second outer shell 2, the first outer shell 1 is provided with a protrusion 11, and the second outer shell 2 is provided with a groove 21 that matches the protrusion 11. The protrusion 11 is inserted into the groove 21. This precise fit between the protrusion and groove 21 achieves three-dimensional zero-gap constraint, and the assembly force is transmitted along the extension direction of the protrusion 11, resulting in low stress in the hook 3 area and effectively preventing deformation. In actual assembly operations, the protrusion and groove 21 structure acts like a precise key and lock. Workers only need to accurately insert the protrusion 11 into the groove 21 to quickly complete the initial positioning of the two outer shells before proceeding with subsequent fastening operations. This not only improves assembly efficiency but also reduces the skill requirements for workers. Moreover, the protrusion and groove 21 structure acts as a guide during assembly, making the assembly process smoother and suitable for the needs of large-scale production. In some factories that mass-produce hook structures, the daily assembly efficiency can be significantly improved after adopting this protrusion and groove 21 positioning and assembly method.

[0044] It is worth mentioning that the first assembly surface 111 and the third assembly surface 112 are formed on the outer surface of the protrusion 11, while the second assembly surface 211 and the fourth assembly surface 212 are formed on the inner surface of the groove 21. This integrated design of the assembly surface and positioning structure has many advantages. First, it shortens the tolerance chain and reduces assembly problems caused by the accumulation of tolerances between parts. During the product manufacturing process, the manufacturing tolerances of each part are within a controllable range, and the integrated design can better ensure the overall accuracy of the product. Second, the wall of the groove 21 protects the assembly surface from impact damage, improving the yield rate. During the transportation and storage of the product, some collisions or frictions are inevitable, and the wall of the groove 21 can provide effective protection for the assembly surface, avoiding damage caused by these external forces.

[0045] In some embodiments, the side of the hook 3 adjacent to the first assembly surface 111 is coplanar with the first assembly surface 111. This design detail greatly enhances the user experience of the product. The parting surface of the mold is set on the first assembly surface 111, achieving a seamless transition between the side of the hook 3 and the boundary of the outer shell, effectively reducing the step difference. When the user touches the hook 3, they will not feel obvious mold parting lines, reducing the risk of scratching their hands. Moreover, this coplanar design also reduces the accumulation of dust and debris at the connection between the hook 3 and the outer shell, making cleaning easier and more convenient in daily use. For example, when using kitchen utensils with this hook structure in a home kitchen environment, since dust and grease do not easily accumulate at the connection between the hook 3 and the outer shell, the user only needs to wipe it gently with a damp cloth to keep the hook 3 clean, greatly reducing the amount of cleaning work.

[0046] In some embodiments with special structures, the angle between the third mounting surface 112 and the first mounting surface 111 is an acute angle. This acute or obtuse angle design is not an unfounded innovation, but has a clear practical purpose. It can adapt well to the contour of curved shells and plays an important role in product designs with high space utilization requirements. For example, in the shell design of some portable electronic products, it is necessary to install a hook structure in a limited space. The acute or obtuse angle design of the third mounting surface 112 can better fit the shape of the curved shell with the first mounting surface 111 as needed, improving space utilization. At the same time, the acute angle layout enhances the shear strength of the mounting surface. In actual use scenarios, when the hook 3 is subjected to lateral force, it can better maintain the stability of the structure. Through mechanical simulation analysis, under the same lateral force, the hook structure with an acute angle mounting surface design has significantly improved shear resistance compared to the structure with a parallel mounting surface design. Example 2: Referring to the figures in the preceding embodiments, the portable power appliances provided in this application cover a variety of common and practical tool types, such as portable vacuum cleaners, electric drills, and portable lawnmowers. These power appliances, thanks to the hook structure of this application, demonstrate excellent performance and practicality in their respective application fields.

[0047] Please see Figure 9 Taking portable vacuum cleaners as an example, users often need to perform cleaning work in different environments in both home and industrial cleaning scenarios. Traditional portable vacuum cleaners often suffer from poorly designed hooks (3), such as being easily damaged, scratching hands, or being unstable when suspended. The portable vacuum cleaner using the hook structure of this application effectively solves these problems. Its hook (3) is integrally formed into the first outer shell (1), eliminating seam defects. The surface flatness error of the force-bearing part of the hook (3) is extremely small, preventing scratches and damage to the vacuum cleaner's appearance during daily use. Furthermore, after the first outer shell (1) and the second outer shell (2) are fastened together, the hook (3) is located near the symmetrical plane of the assembled shell structure, resulting in balanced overall force. When the vacuum cleaner is suspended, it can be stably fixed to a wall or other hanging position without tilting or falling.

[0048] In some embodiments, a front hook 4 and a rear hook 5 are respectively provided on the upper part of the vacuum cleaner away from the hook 3. The structure of the front hook 4 and the rear hook 5 is similar to that of the hook 3. The front hook 4 and the rear hook 5 can both be provided on the first housing 1 or the second housing 2, or they can be provided on the first housing 1 and the second housing 2 respectively. In use, the hook 3 and the front hook 4 can be connected by a shoulder strap, or the shoulder strap can be connected to the hook 3 and the front hook 5, or the shoulder strap can be connected to the rear hook 5 and the front hook 4, making it convenient to carry the vacuum cleaner on one's body.

[0049] In another embodiment, the upper end of the vacuum cleaner is also provided with a belt hook 6, which makes it easy to hang the vacuum cleaner on the belt and carry it.

[0050] For electric drills, frequent picking and putting down is necessary in scenarios such as construction and home renovation. The hook structure of this application provides a reliable suspension method for the electric drill. The load-bearing capacity of hook 3 has been rigorously tested and can easily withstand the weight of the electric drill, ensuring structural stability even under high-frequency use. At the same time, the design of hook 3 being coplanar with the outer shell simplifies the mold structure, improves the appearance quality and structural strength, and enhances the comfort of operation.

[0051] Portable lawnmowers are widely used in garden maintenance and yard weeding. Due to the complex working environment, the stability and portability of lawnmowers are of high importance. The hook structure of this application allows the portable lawnmower to be conveniently hung on the wall of the tool shed when not in use, with high strength and space saving. The assembly surface isolation design of hook 3 blocks stress transmission and reduces the risk of deformation in the hook 3 area. Even when the lawnmower is subjected to a certain amount of vibration, hook 3 can still remain stable. In a yard mowing operation, the lawnmower using a traditional hook structure deformed hook 3 after passing over a bumpy lawn, resulting in unstable suspension; while the lawnmower using the hook structure of this application, under the same working environment, maintained a intact hook structure and normal suspension, fully demonstrating its reliability in complex working environments. In summary, the design details of the hook structure in Embodiment 1 improve the performance and quality of the product from multiple dimensions; while in Embodiment 2, the application of this hook structure to portable electric appliances effectively solves the pain points of these appliances in actual use, improves user experience and work efficiency, and has broad market application prospects.

[0052] The hook structure provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A hook structure, characterized in that, include: The first housing includes a first mounting surface and a hook, wherein the hook has an opening and the angle between the direction of the opening and the normal of the first mounting surface is less than 90°. The second housing includes a second mounting surface for engaging with the first mounting surface; Wherein, after the first mounting surface and the second mounting surface are attached, the first outer shell and the second outer shell form an overall symmetrical shell structure, and the hook is located near the plane of symmetry of the shell structure.

2. The hook structure according to claim 1, characterized in that, The first housing further includes a third mounting surface, the hook being at least partially located between the first mounting surface and the third mounting surface, and the opening direction being consistent with the demolding direction of the first mounting surface.

3. The hook structure according to claim 2, characterized in that, The third assembly surface is parallel to the first assembly surface.

4. The hook structure according to claim 2, characterized in that, The angle between the third assembly surface and the first assembly surface is an acute angle or an obtuse angle, or the third assembly surface is a composite surface.

5. The hook structure according to claim 3, characterized in that, The side of the hook facing the third assembly surface is coplanar with the third assembly surface.

6. The hook structure according to claim 3, characterized in that, The second housing also includes a fourth mounting surface disposed opposite to the third mounting surface, the fourth mounting surface being used for fitting and assembling with the third mounting surface.

7. The hook structure according to claim 6, characterized in that, The first outer shell has a protrusion, and the second outer shell has a groove that matches the protrusion. The protrusion is inserted into the groove to achieve positioning and assembly of the first outer shell and the second outer shell.

8. The hook structure according to claim 7, characterized in that, The first and third mounting surfaces are formed on the outer surface of the protrusion, and the second and fourth mounting surfaces are formed on the inner surface of the groove.

9. The hook structure according to claim 1, characterized in that, The shell structure formed by the first outer shell and the second outer shell has a shape profile that is mirror-symmetric about the plane of symmetry.

10. A portable electric appliance, characterized in that, Includes the hook structure as described in any one of claims 1 to 9.

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