Magnetic transmission structure and electric tool

Abstract

The utility model provides a magnetic transmission structure which comprises a motor, an output shaft and a magnetic transmission assembly. The magnetic transmission assembly comprises a first transmission assembly and a second transmission assembly, the first transmission assembly is arranged on the driving shaft, and the second transmission assembly is arranged on the output shaft; the first transmission assembly comprises a first shaft sleeve arranged on the driving shaft and a first magnetic component installed on the first shaft sleeve, and the second transmission assembly comprises a second shaft sleeve arranged on the output shaft and a second magnetic component installed on the second shaft sleeve. The first shaft sleeve is provided with an inner edge part connected to the driving shaft and an extension part extending from the inner edge part to the output shaft, the second shaft sleeve is at least partially accommodated in the extension part, and the first magnetic component and the second magnetic component are not in contact; the first magnetic component is positioned through a first positioning structure, and the axial end face, facing the first magnetic component, of the first positioning structure is flush with or spaced from the axial end face, facing the motor, of the second magnetic component.

Description

Technical Field

[0001] This utility model relates to the field of power tool structure technology, and in particular to a magnetic transmission structure and a power tool. Background Technology

[0002] Most common power tools on the market use an electric motor as a power source. The motor's drive shaft is connected to the output shaft, and the machining tool is connected to the output shaft. The power of the motor is transmitted to the machining tool in sequence through the drive shaft and the output shaft, thereby realizing the machining of the workpiece.

[0003] In a straight mill, the motor's drive shaft is typically connected to the output shaft via a coupling. Common couplings include metal couplings (high strength, but noisier) and plastic couplings (lower strength, but quieter). Because the coupling, drive shaft, and output shaft need to have high coaxiality, the machining precision of the coupling is crucial. Furthermore, couplings are prone to overheating, excessive wear, and high noise during prolonged, high-speed operation, thus affecting the normal operation and lifespan of the power tool. Utility Model Content

[0004] The purpose of this invention is to provide a magnetic transmission structure that uses non-contact spatial magnetic transmission to solve or reduce problems such as heat generation, wear, and noise that occur during the operation of the magnetic transmission components, and to reduce the requirements for the coaxiality of the magnetic transmission components with the drive shaft and the output shaft.

[0005] This utility model provides a magnetic transmission structure, including a motor, an output shaft, and a magnetic transmission assembly. The motor has a drive shaft. The magnetic transmission assembly includes a first transmission assembly and a second transmission assembly. The first transmission assembly is disposed on the drive shaft, and the second transmission assembly is disposed on the output shaft. The first transmission assembly includes a first bushing disposed on the drive shaft and a first magnetic component mounted on the first bushing. The second transmission assembly includes a second bushing disposed on the output shaft and a second magnetic component mounted on the second bushing. The first bushing has an inner edge connected to the drive shaft and an extension extending from the inner edge toward the output shaft. The second bushing is at least partially housed in the extension. The first magnetic component is positioned by a first positioning structure. The axial end face of the first positioning structure facing the first magnetic component is flush with or spaced apart from the axial end face of the second magnetic component facing the motor.

[0006] In one possible implementation, the first magnetic component and the second magnetic component have the same magnetism on the sides that are close to each other, and the second magnetic component can be subjected to the repulsive force of the first magnetic component; or, the first magnetic component and the second magnetic component have opposite magnetism on the sides that are close to each other, and the second magnetic component can be subjected to the magnetic attraction force of the first magnetic component.

[0007] In one possible implementation, the second magnetic component is positioned circumferentially along the drive shaft, corresponding to the rotation path of the first magnetic component.

[0008] In one possible implementation, the projections of the first magnetic component and the second magnetic component onto the first bushing (32) at least partially overlap.

[0009] In one possible implementation, the first bushing is sleeved outside the second bushing, the first magnetic component is disposed on the inner wall of the first bushing, and the second magnetic component is disposed on the outer wall of the second bushing.

[0010] Alternatively, the second bushing is fitted outside the first bushing, the first magnetic component is disposed on the outer wall of the first bushing, and the second magnetic component is disposed on the inner wall of the second bushing.

[0011] In one possible implementation, there are multiple first magnetic components, which are spaced apart circumferentially along the first bushing; and there are multiple second magnetic components, which are spaced apart circumferentially along the second bushing.

[0012] In one possible implementation, the first positioning structure is disposed on the first bushing, and the first positioning structure is used to position the installation position of the first magnetic component on the first bushing; and / or, the second bushing is provided with a second positioning structure, and the second positioning structure is used to position the installation position of the second magnetic component on the second bushing.

[0013] In one possible implementation, the drive shaft and the output shaft are coaxially arranged, with one end of the drive shaft and one end of the output shaft close to each other and spaced apart; the first bushing is fixedly arranged on the drive shaft near the end of the output shaft, and the second bushing is fixedly arranged on the output shaft near the end of the drive shaft.

[0014] In one possible implementation, a fan and a dustproof component are mounted on the drive shaft, the fan being able to rotate with the drive shaft; the dustproof component is located between the fan and the first transmission assembly, and a dust storage chamber is formed between the dustproof component and the fan.

[0015] This utility model also provides an electric tool, including the magnetic transmission structure described above.

[0016] The magnetic transmission structure provided by this utility model transmits power between the drive shaft and output shaft of a motor via a magnetic transmission assembly. When the motor is running, the drive shaft drives the first magnetic component to rotate, and the second magnetic component follows the first magnetic component under the magnetic force, thereby driving the output shaft to rotate. Since the first and second magnetic components are transmitted through magnetic force and do not contact each other, the magnetic transmission assembly adopts a non-contact spatial magnetic transmission, thereby solving or reducing problems such as heat generation, wear, and noise that occur during the operation of the magnetic transmission assembly, and reducing the requirements for the coaxiality of the magnetic transmission assembly with the drive shaft and output shaft, which facilitates the manufacturing of the magnetic transmission assembly and its installation with the drive shaft and output shaft. At the same time, this magnetic transmission structure also has an anti-stalling overload function. When the rotation of the output shaft is obstructed, the drive shaft of the motor can rotate normally, thereby avoiding the motor from being obstructed or stalling, which helps to improve the service life of the motor. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the power tool in the embodiment of this utility model.

[0018] Figure 2 for Figure 1 A partial cross-sectional schematic diagram.

[0019] Figure 3 for Figure 1 A cross-sectional schematic diagram.

[0020] Figure 4 for Figure 3 A magnified view of a portion of location A in the diagram.

[0021] Figure 5 This is an exploded structural diagram of the magnetic transmission component in an embodiment of this utility model.

[0022] Figure 6 This is an exploded structural diagram of the magnetic transmission component in another embodiment of the present invention. Detailed Implementation

[0023] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0024] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and claims of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0025] like Figures 1 to 5 As shown, the magnetic transmission structure provided in this embodiment of the present invention includes a motor 1, an output shaft 2, and a magnetic transmission assembly M. The motor 1 has a drive shaft 11, and the drive shaft 11 of the motor 1 and the output shaft 2 are transmitted through the magnetic transmission assembly M. The magnetic transmission assembly M includes a first transmission assembly 3 and a second transmission assembly 4. The first transmission assembly 3 is fixedly mounted on the drive shaft 11, and the second transmission assembly 4 is fixedly mounted on the output shaft 2. The first transmission assembly 3 includes a first magnetic component 31, and the second transmission assembly 4 includes a second magnetic component 41. The first magnetic component 31 and the second magnetic component 41 can be magnetic components such as magnets or magnets. The first magnetic component 31 and the second magnetic component 41 are close to each other but do not contact each other, and the second magnetic component 41 can be subjected to the magnetic force of the first magnetic component 31. When the motor 1 is running, the drive shaft 11 rotates, the first magnetic component 31 can rotate with the drive shaft 11, and the second magnetic component 41 can rotate with the first magnetic component 31 under the action of the magnetic force of the first magnetic component 31, thereby driving the output shaft 2 to rotate.

[0026] The magnetic transmission structure provided by this utility model transmits power between the drive shaft 11 and the output shaft 2 of the motor 1 via a magnetic transmission assembly M. When the motor 1 is running, the drive shaft 11 of the motor 1 drives the first magnetic component 31 to rotate, and the second magnetic component 41 rotates along with the first magnetic component 31 under the magnetic force of the first magnetic component 31, thereby driving the output shaft 2 to rotate. Since the first magnetic component 31 and the second magnetic component 41 are transmitted through magnetic force and do not contact each other, that is, the magnetic transmission assembly M adopts non-contact spatial magnetic transmission, thereby solving or reducing the heat generation and wear that occur in the magnetic transmission assembly M during operation. This design addresses issues such as noise and reduces the coaxiality requirements of the magnetic transmission component M with the drive shaft 11 and output shaft 2, facilitating the manufacturing of the magnetic transmission component M (reducing the machining accuracy requirements) and the installation of the magnetic transmission component M with the drive shaft 11 and output shaft 2 (reducing the coaxial installation accuracy requirements). Furthermore, the magnetic transmission structure also features anti-stalling overload protection; when the rotation of the output shaft 2 is obstructed, the drive shaft 11 of the motor 1 can still rotate normally, thus preventing the motor 1 from being obstructed or stalling, and improving the service life of the motor 1.

[0027] like Figures 3 to 5 As shown, in one embodiment, the first magnetic component 31 and the second magnetic component 41 have the same magnetism on the sides that are close to each other (i.e., the magnetism of the side of the first magnetic component 31 close to the second magnetic component 41 is the same as the magnetism of the side of the second magnetic component 41 close to the first magnetic component 31); when the first magnetic component 31 rotates with the drive shaft 11, the second magnetic component 41 can be subjected to the repulsive force of the first magnetic component 31, so that the second magnetic component 41 rotates with the first magnetic component 31 under the action of the repulsive force of the first magnetic component 31. Figure 5 As shown, in this embodiment, the magnetic poles on the sides of the first magnetic component 31 and the second magnetic component 41 that are close to each other are both S poles. Figure 6 As shown, in another embodiment, the magnetic poles on the sides of the first magnetic component 31 and the second magnetic component 41 that are close to each other are both N poles.

[0028] In another embodiment, the magnetic properties of the sides of the first magnetic component 31 and the second magnetic component 41 that are close to each other are opposite (i.e., the magnetic properties of the side of the first magnetic component 31 close to the second magnetic component 41 are opposite to the magnetic properties of the side of the second magnetic component 41 close to the first magnetic component 31). When the first magnetic component 31 rotates with the drive shaft 11, the second magnetic component 41 is attracted by the magnetic force of the first magnetic component 31, causing the second magnetic component 41 to rotate along with the first magnetic component 31 under the magnetic attraction of the first magnetic component 31. In one embodiment, the magnetic pole of the side of the first magnetic component 31 close to the second magnetic component 41 is the S pole, and the magnetic pole of the side of the second magnetic component 41 close to the first magnetic component 31 is the N pole. In another embodiment, the magnetic pole of the side of the first magnetic component 31 close to the second magnetic component 41 is the N pole, and the magnetic pole of the side of the second magnetic component 41 close to the first magnetic component 31 is the S pole.

[0029] like Figures 2 to 5 As shown, in one embodiment, the drive shaft 11 and the output shaft 2 are coaxially arranged, with one end of the drive shaft 11 and one end of the output shaft 2 close to each other and spaced apart (i.e., they do not contact each other). The first transmission component 3 is fixedly arranged on the drive shaft 11 near the end of the output shaft 2, and the second transmission component 4 is fixedly arranged on the output shaft 2 near the end of the drive shaft 11.

[0030] like Figures 2 to 5 As shown, in one embodiment, the second magnetic component 41 is positioned along the circumference of the drive shaft 11, corresponding to the rotation path of the first magnetic component 31 (i.e., the projections of the first magnetic component 31 and the second magnetic component 41 can overlap in the direction parallel to the radial direction of the drive shaft 11), so that the first magnetic component 31 can apply a magnetic force along the circumference of the drive shaft 11 to the second magnetic component 41, thereby enabling the first magnetic component 31 to drive the second magnetic component 41 to rotate together when rotating.

[0031] like Figures 2 to 5As shown, in one embodiment, the first transmission assembly 3 further includes a first bushing 32, and the second transmission assembly 4 further includes a second bushing 42. The first bushing 32 is disposed on the drive shaft 11, and the second bushing 42 is disposed on the output shaft 2. Specifically, the first bushing 32 is fixedly disposed on the drive shaft 11 near the end of the output shaft 2, and the second bushing 42 is fixedly disposed on the output shaft 2 near the end of the drive shaft 11. Both the first bushing 32 and the second bushing 42 are cylindrical structures. The first bushing 32 and the second bushing 42 are nested together and spaced apart. The first bushing 32, the second bushing 42, the drive shaft 11, and the output shaft 2 are coaxially arranged. The first magnetic component 31 is disposed on the first bushing 32, and the second magnetic component 41 is disposed on the second bushing 42. Along the circumference of the first bushing 32, the position of the second magnetic component 41 corresponds to the rotation path of the first magnetic component 31 (i.e., along the radial direction of the first bushing 32, the projections of the first magnetic component 31 and the second magnetic component 41 can overlap). When the motor 1 is running, the drive shaft 11 rotates, the first bushing 32 and the first magnetic component 31 can rotate with the drive shaft 11, and the second magnetic component 41 can rotate with the first magnetic component 31 under the magnetic force of the first magnetic component 31, thereby driving the second bushing 42 to rotate, thus driving the output shaft 2 to rotate.

[0032] like Figures 2 to 5 As shown, in one embodiment, the inner diameter of the first bushing 32 is larger than the outer diameter of the second bushing 42. The first bushing 32 is fitted over the second bushing 42. The first magnetic component 31 is fixedly disposed on the inner wall of the first bushing 32, and the second magnetic component 41 is fixedly disposed on the outer wall of the second bushing 42. In another embodiment, the inner diameter of the second bushing 42 is larger than the outer diameter of the first bushing 32. The second bushing 42 is fitted over the first bushing 32. The first magnetic component 31 is disposed on the outer wall of the first bushing 32, and the second magnetic component 41 is disposed on the inner wall of the second bushing 42.

[0033] like Figures 2 to 5As shown, in one embodiment, the first bushing 32 is provided with a first positioning structure 320, which is used to position the first magnetic component 31 on the first bushing 32; the second bushing 42 is provided with a second positioning structure 420, which is used to position the second magnetic component 41 on the second bushing 42. Optionally, the axial end face of the first positioning structure facing the first magnetic component and the axial end face of the second magnetic component facing the motor are flush or spaced apart from each other. By providing the first positioning structure 320 and the second positioning structure 420, the installation positions of the first magnetic component 31 and the second magnetic component 41 can be aligned, which not only facilitates installation but also ensures sufficient magnetic force between the first magnetic component 31 and the second magnetic component 41. The axial end face of the first positioning structure 320 facing the first magnetic component 31 and the axial end face of the second magnetic component 41 facing the motor 1 are flush or spaced apart. In this embodiment, the two are flush to ensure complete correspondence between the first magnetic component 31 and the second magnetic component 41. Furthermore, the first positioning structure 320 is a positioning protrusion on the inner wall of the first bushing 32, which is either integral or separate from the first bushing 32. The first magnetic component 31 can abut against the positioning protrusion to position its installation. The second positioning structure 420 is a groove on the outer wall of the second bushing 42, in which the second magnetic component 41 is positioned to position its installation. The first magnetic component 31 and the first bushing 32, and the second magnetic component 41 and the second bushing 42, can be fixed by adhesive bonding, interference fit, or other methods. Of course, in other embodiments, the first positioning structure 320 and the second positioning structure 420 can also have other structural forms.

[0034] like Figures 2 to 5As shown, in one embodiment, both the first magnetic component 31 and the second magnetic component 41 have a tile-like structure. There are multiple first magnetic components 31, spaced apart circumferentially along the first bushing 32; there are also multiple second magnetic components 41, spaced apart circumferentially along the second bushing 42 (in this embodiment, there are two of each; however, in other embodiments, there may be more). The number of first magnetic components 31 is the same as the number of second magnetic components 41; when the first bushing 32 rotates a certain angle, the multiple first magnetic components 31 can correspond one-to-one with the multiple second magnetic components 41. Of course, in other embodiments, the first magnetic components 31 and the second magnetic components 41 can also have other shapes and structures, for example, both the first magnetic components 31 and the second magnetic components 41 can be cylindrical structures, nested and spaced apart, and their projections on the first bushing 32 at least partially overlap, thus improving the magnetic transmission between them. It should be noted that when both the first magnetic component 31 and the second magnetic component 41 are cylindrical structures, the sides of the first magnetic component 31 and the second magnetic component 41 that are close to each other should have opposite magnetic properties, and the two are transmitted through magnetic attraction.

[0035] like Figures 2 to 5 As shown, in one embodiment, the first bushing 32 is fixedly connected to the drive shaft 11 by a thread. Specifically, the outer wall of the drive shaft 11 is provided with an external thread 12. The first bushing 32 has an inner edge portion 321 connected to the drive shaft 11 and an extension portion extending from the inner edge portion 321 toward the output shaft 2. The inner edge portion 321 is formed by radially protruding inward from the end of the first bushing 32, and an internal thread (not shown) is provided on the inner edge portion 321. The inner edge portion 321 is connected to the drive shaft 11 by a thread. The second bushing 42 is fixedly connected to the output shaft 2 by a screw 43. The second bushing 42 is at least partially housed within the first bushing 32. Specifically, a limiting portion 421 protrudes from the inner wall of the second bushing 42. The screw shank of the screw 43 passes through the second bushing 42 and is screwed to the end of the drive shaft 11. The head of the screw 43 abuts against the limiting portion 421, thereby fixing the second bushing 42 to the output shaft 2. Of course, in other embodiments, the first bushing 32 and the drive shaft 11, and the second bushing 42 and the output shaft 2 can also be fixed in other ways (e.g., by interference fit connection).

[0036] like Figures 1 to 4As shown, in one embodiment, a fan 5 is mounted on the drive shaft 11 and fixed to the drive shaft 11. The fan 5 can rotate with the drive shaft 11. The fan 5 is used to blow air onto the motor 1 (i.e., as seen in the figure, the fan 5 can blow air to its right), thereby cooling the motor 1. A dustproof component 6 is also mounted on the drive shaft 11. The dustproof component 6 is located between the fan 5 and the first transmission component 3, and a labyrinth-shaped dust storage chamber 60 is formed between the dustproof component 6 and the fan 5 (i.e., the dust storage chamber 60 is a curved labyrinth structure). Specifically, when the fan 5 is running, the fan 5 will attract dust in the air towards the side closer to the motor 1. By setting the dustproof component 6, on the one hand, the dustproof component 6 can block the dust away from the fan 5; on the other hand, dust that is not blocked by the dustproof component 6 can fall into and be stored in the dust storage chamber 60 after it comes between the dustproof component 6 and the fan 5, thereby minimizing the amount of dust blown towards the motor 1 by the fan 5 and ensuring the cleanliness of the motor 1.

[0037] like Figures 1 to 4 As shown, in one embodiment, the magnetic transmission structure further includes a first housing (not shown), and a first bearing 7 is also sleeved on the drive shaft 11. The first bearing 7 is located on the side of the dustproof component 6 away from the fan 5. The motor 1, fan 5, dustproof component 6, and first bearing 7 are all disposed inside the first housing, and the drive shaft 11 is rotatably connected to the first housing through the first bearing 7. Specifically, the inner ring of the first bearing 7 is fixed to the drive shaft 11, the outer ring of the first bearing 7 is fixed to the inner wall of the first housing, and the dustproof component 6 is fixed to the outer ring of the first bearing 7. When the motor 1 is running, the fan 5 and the inner ring of the first bearing 7 will rotate together with the drive shaft 11, while the dustproof component 6 and the outer ring of the first bearing 7 will not rotate together with the drive shaft 11 (of course, in other embodiments, the dustproof component 6 can also be fixed to the drive shaft 11, in which case the dustproof component 6 will rotate together with the drive shaft 11).

[0038] like Figures 1 to 4 As shown, in one embodiment, the magnetic transmission structure further includes a second housing 8, within which the output shaft 2 is disposed; the second housing 8 is connected to the first housing. A second bearing 81 is fitted onto the output shaft 2, and the output shaft 2 is rotatably connected to the second housing 8 via the second bearing 81. Specifically, the inner ring of the second bearing 81 is fixed to the output shaft 2, and the outer ring of the second bearing 81 is fixed to the inner wall of the second housing 8. A working head 9 is provided at the end of the output shaft 2 away from the drive shaft 11. This working head 9 is used to connect a machining tool (not shown; the machining tool may be, for example, a drill bit, cutting tool, grinding tool, etc.). The power of the motor 1 is transmitted sequentially to the machining tool via the drive shaft 11, the magnetic transmission assembly M, the output shaft 2, and the working head 9, thereby realizing the machining of the workpiece.

[0039] This utility model embodiment also provides an electric tool, including the magnetic transmission structure as described above; the electric tool is, for example, a drilling machine, an electric wrench, a grinder, a cutting machine, etc.

[0040] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A magnetic transmission structure, characterized in that, The device includes a motor, an output shaft, and a magnetic transmission assembly. The motor has a drive shaft. The magnetic transmission assembly includes a first transmission assembly and a second transmission assembly. The first transmission assembly is disposed on the drive shaft, and the second transmission assembly is disposed on the output shaft. The first transmission assembly includes a first bushing disposed on the drive shaft and a first magnetic component mounted on the first bushing. The second transmission assembly includes a second bushing disposed on the output shaft and a second magnetic component mounted on the second bushing. The first bushing has an inner edge connected to the drive shaft and an extension extending from the inner edge toward the output shaft. The second bushing is at least partially housed in the extension. The first magnetic component is positioned by a first positioning structure. The axial end face of the first positioning structure facing the first magnetic component is flush with or spaced apart from the axial end face of the second magnetic component facing the motor.

2. The magnetic transmission structure as described in claim 1, characterized in that, The first magnetic component and the second magnetic component have the same magnetism on the side that are close to each other, and the second magnetic component is repelled by the first magnetic component; or, the first magnetic component and the second magnetic component have opposite magnetism on the side that are close to each other, and the second magnetic component is attracted by the first magnetic component.

3. The magnetic transmission structure as described in claim 1, characterized in that, Along the circumference of the drive shaft, the position of the second magnetic component corresponds to the rotation path of the first magnetic component.

4. The magnetic transmission structure as described in claim 1, characterized in that, The projections of the first magnetic component (31) and the second magnetic component (41) on the first bushing (32) at least partially overlap.

5. The magnetic transmission structure as described in claim 4, characterized in that, The first bushing is sleeved outside the second bushing, the first magnetic component is disposed on the inner wall of the first bushing, and the second magnetic component is disposed on the outer wall of the second bushing; Alternatively, the second bushing is fitted outside the first bushing, the first magnetic component is disposed on the outer wall of the first bushing, and the second magnetic component is disposed on the inner wall of the second bushing.

6. The magnetic transmission structure as described in claim 4, characterized in that, The number of first magnetic components is multiple, and the multiple first magnetic components are arranged at intervals along the circumference of the first bushing; the number of second magnetic components is multiple, and the multiple second magnetic components are arranged at intervals along the circumference of the second bushing.

7. The magnetic transmission structure as described in claim 4, characterized in that, The first positioning structure is disposed on the first bushing, and the first positioning structure is used to position the installation position of the first magnetic component on the first bushing; and / or, the second bushing is provided with a second positioning structure, and the second positioning structure is used to position the installation position of the second magnetic component on the second bushing.

8. The magnetic transmission structure as described in claim 4, characterized in that, The drive shaft and the output shaft are coaxially arranged, with one end of the drive shaft and one end of the output shaft close to each other and spaced apart; the first bushing is fixedly arranged on the drive shaft near the end of the output shaft, and the second bushing is fixedly arranged on the output shaft near the end of the drive shaft.

9. The magnetic transmission structure as described in any one of claims 1-8, characterized in that, A fan and a dustproof component are fitted onto the drive shaft. The fan rotates with the drive shaft. The dustproof component is located between the fan and the first transmission assembly, and a dust storage chamber is formed between the dustproof component and the fan.

10. A power tool, characterized in that, Includes the magnetic transmission structure as described in any one of claims 1-9.

Images