System, method and flange arrangement for securing a saw blade to a drive spindle of a sawing device

Abstract

The invention relates to a flange device and to a method for fastening a saw blade to a drive spindle of a sawing device. The flange device comprises, inter alia, a nut which is arranged in a movable manner in the interior of a flange body, wherein, in a closed state of the flange device, the nut surrounds a central screwing device guided in the drive spindle for fastening. In another aspect, the invention relates to a system for fastening a saw blade to a drive spindle of a sawing device, wherein the system has the proposed flange device, as well as a sawing device and a central screwing device. The drive spindle of the sawing device can be pressed in the direction of the flange device by a spring, so that in the closed state it can be received by the interior of the nut of the flange device.

Description

Technical Field

[0001] This invention relates to a flange device and a method for fastening a saw blade to the drive spindle of a sawing device. The flange device particularly includes a nut movably arranged within the flange body, wherein, in the closed state of the flange device, the nut surrounds a central tightening device guided within the drive spindle for fastening. In a second aspect, the invention relates to a system for fastening a saw blade to the drive spindle of a sawing device, wherein the system has the proposed flange device, a sawing device, and a central tightening device. The central tightening device of the sawing device can be pressed against a spring in the direction of the flange device, such that, in the closed state, the central tightening device can be received by the interior of the nut of the flange device. Background Technology

[0002] Sawing devices, such as wall saws, are known in the prior art. These devices introduce a cut into a substrate or wall. A sawing device typically has a saw blade as a tool that performs a rotary movement and thus introduces a cut into the substrate or wall to be processed. The saw blade is secured to the drive spindle of the sawing device via a saw blade flange or flange assembly.

[0003] The drawback of existing solutions for these saw blade flanges is that they typically have a large number of moving parts, making saw blade assembly and replacement very complex and time-consuming. Furthermore, numerous small parts can easily be lost, especially when sawing equipment is used on construction sites, which can cause further delays. Problems arise particularly when specialized fastening components such as special screws are used to secure the saw blade, especially when these specialized screws are lost and replacements may not be readily available.

[0004] Furthermore, many flange devices known in the prior art have components that are easily soiled, thus failing to ensure that the saw blade is always securely and robustly fastened to the drive spindle.

[0005] If a flange device that allows for pre-alignment of the saw blade is available, it would be welcomed by those skilled in the art. This is because finding and aligning the threaded hole must be done with great care, especially when installing saw blades with large diameters. This requires trained and experienced personnel, as well as specialized tools specifically designed for finding the threaded hole. If the saw blade is not properly aligned, undesirable rapid wear of the threads may occur.

[0006] Therefore, one object of the present invention is to provide a flange device for a sawing apparatus that overcomes the defects and disadvantages of the prior art, and that allows the saw blade to be fastened to the drive spindle of the sawing apparatus in a tool-free, simple, and time-saving manner. Another object of the present invention is to make the connection between the flange device and the saw blade dirt-resistant, stable, robust, and secure. To reduce the risk of parts loss during saw blade installation or replacement, it is desirable that the provided flange device comprise as few parts as possible.

[0007] This objective is achieved through the subject matter of the independent claim. Advantageous embodiments relating to the subject matter of the independent claim can be found in the dependent claims. Summary of the Invention

[0008] In a first aspect, this objective is achieved by a flange assembly for fastening a saw blade to the drive spindle of a sawing device, wherein the flange assembly has a centering ring, a nut, and a flange body. The flange assembly is characterized in that the flange body forms the outer region of the flange assembly, wherein the nut is movably arranged inside the flange body, wherein the centering ring is fastened to the flange body by a fastening member, and wherein, in the closed state of the flange assembly, the nut surrounds a central tightening device guided in the drive spindle for fastening. According to the invention, this central tightening device is preferably referred to as a fastening screw.

[0009] In a second aspect, the present invention relates to a system for fastening a saw blade to the drive spindle of a sawing device, wherein the system has the proposed flange device, the sawing device, and a center screwing device.

[0010] As a result of using the proposed flange device, the need for specially stored tools or fastening components, such as special screws, can be advantageously eliminated. In particular, the saw blade can be manually fastened to the sawing device, which is associated with the advantage that manual fastening is generally performed in a more "tactile" manner, thus reducing the risk of mechanical damage to the components of the flange device and the sawing device. Tests have shown that the components of the proposed flange device are particularly easy to clean. Furthermore, the proposed flange device consists of relatively few parts, thus making it particularly easy to assemble. In particular, personnel using this device do not need extensive training. Another advantage of the invention is that the nut is provided as a movable part in the flange device, which, as a result, makes the system easier to clean and maintain.

[0011] According to the invention, the sawing device is preferably a wall saw. When using a wall saw, there are applications where the intention is to perform a flat cut, where there is no space between the saw blade and the substrate to be processed for securing the saw blade. The proposed flange device is intended to be particularly suitable for this application. In this regard, the proposed flange device may also preferably be referred to as or denote a flat-cut flange.

[0012] The sawing device according to the invention, preferably also called a "saw," is preferably designed to introduce cutting into walls and substrates. For this purpose, a saw blade is used as the tool for cutting, wherein the saw blade preferably performs rotational movement about an axis of rotation. This axis of rotation preferably coincides with the virtual central axis of the saw's drive spindle, which is driven by the saw's motor and transmits the rotational movement to the saw blade.

[0013] The saw blade is preferably an integral part of the saw head of the sawing device, wherein the saw blade is preferably secured to the saw arm and driven about a rotation axis by a drive motor. The saw arm is designed to pivot and can be adjusted about a pivot axis by a pivot motor. The sawing device, particularly a wall saw, can also cooperate with a motorized feed unit and a guide bracket. The motorized feed unit preferably has a feed motor, wherein the saw head is arranged on the guide bracket and can be moved along a guide rail by the feed motor. The saw blade is driven about a rotation axis by a drive motor, a drive spindle, and a transmission that connects the drive spindle to the drive motor in a torque transmission manner.

[0014] According to the invention, preferably, the saw blade is fastened to the drive spindle via a flange assembly. The flange assembly includes a centering ring, a nut, and a flange body, wherein the flange body and the saw blade are connected together. The centering ring and the flange body are connected together by screws. Radially arranged fastening screws are located on the circumference of the centering ring and can be screwed into corresponding radial holes with internal threads in the flange body. The saw blade can preferably be fastened to the flange body by fastening screws located on the circumference of the flange body. The flange body is preferably also connected to the drive spindle of the sawing device, so that when the saw blade is fastened to the flange body of the flange assembly, the saw blade is driven when the drive spindle rotates. As a result, the saw blade can be driven to rotate, thereby allowing machining of the substrate.

[0015] In another aspect, the present invention relates to a method for securing a saw blade to the drive spindle of a sawing device, wherein the method comprises the following steps:

[0016] a) Provide a sawing device with a drive spindle,

[0017] b) Provide a center screwing device.

[0018] c) Provide the proposed flange device, wherein, in the open state, which serves as the starting point of the fastening method, the nut of the flange device is substantially completely received within the flange body of the flange device, and the central tightening device is substantially completely arranged within the drive spindle.

[0019] d) The center tightening device is introduced into the internal thread of the nut, resulting in the engagement of the driver and the nut of the flange assembly.

[0020] e) Continue to screw the center screwing device into the internal thread of the nut.

[0021] f) Continue to screw the center screwing device into the internal thread of the nut, as a result the nut of the flange device is pulled onto the center screwing device.

[0022] According to the invention, preferably, the drive in the sawing device has protrusions on its end face that can engage with recesses on the rear side of the nut of the flange device. This preferably occurs in response to the central tightening device being introduced into the internal thread of the nut. The fastening screw is preferably further tightened into the internal thread of the nut of the flange device. As a result, a sleeve inside the saw can be introduced into the gap between the drive and the central tightening device, and the first spring can be compressed. If the fastening screw is further tightened into the nut, then the nut is pulled back out of the flange body of the flange device. As a result, the nut is pulled onto the fastening screw. In other words, the fastening screw and the nut are tightened, wherein this tightening is supported by the sleeve, the stop, and the first spring. According to the invention, preferably, the nut is pulled out of the flange body until a tightness is established between the flange and the saw, because the stop has been reached and the external thread of the central tightening device has been substantially fully received in the nut of the flange device. In other words, in this way, a threaded connection is established between the nut of the flange device and the fastening screw. The saw blade can be screwed onto the front of the flange and thus secured to the flange and the sawing device. In this way, the proposed method provides a possible way to secure the saw blade to the sawing device using a flange assembly. The definitions, technical effects, and advantages described for the flange assembly and system also apply to the proposed fastening method, and vice versa.

[0023] In a preferred embodiment, the present invention includes the following method steps:

[0024] a) Provide a sawing device with a drive spindle,

[0025] b) Provide a center screwing device.

[0026] c) Provide the proposed flange device, wherein, in the open state, which serves as the starting point of the fastening method, the nut of the flange device is substantially completely received within the flange body of the flange device, and the central tightening device is substantially completely arranged within the drive spindle.

[0027] d) The center-tightening device is introduced into the internal thread of the nut, resulting in the protrusion on the end face of the driver engaging with the cut-off portion on the rear side of the nut.

[0028] e) Continue screwing the center screwing device into the internal thread of the nut, resulting in the sleeve being introduced into the gap between the driver and the center screwing device, and the first spring being compressed.

[0029] f) Continue to screw the center screwing device into the internal thread of the nut, as a result the nut is pulled out of the flange body until it reaches the closed state, because the stop is reached and the external thread of the center screwing device is substantially fully received in the nut of the flange device.

[0030] According to the invention, preferably, in this closed state, the sleeve is substantially completely received in the gap formed between the central tightening device and the driver, and the first spring is in a loaded state. The closed state preferably corresponds to the state in which the saw blade can be fastened to the sawing device via the flange. Therefore, according to the invention, the closed state is also referred to as the tightened state.

[0031] According to the invention, preferably, the nut of the flange device cooperates with the fastening screw to establish a connection. To mount the flange device onto the sawing device, the flange device is first brought to the vicinity of the drive spindle of the sawing device. In this case, the nut is fully retracted into the flange body, and a gap is formed between the nut and the fastening screw. The center tightening device is preferably also constructed in a movable manner and can move laterally within the interior formed by the drive spindle. In other words, the fastening device can move forward (towards the flange device) and backward (away from the flange device). The fastening screw includes a screw head at its rear end, which forms a stop, allowing the screw to travel into the interior of the drive spindle until it reaches the stop. In the untightened state, i.e., the "open" state according to the invention, the fastening screw is not fully retracted into its interior.

[0032] In the next step, the screw is moved toward the flange assembly. Preferably, the fastening screw travels into the nut of the flange assembly. According to the invention, it is also preferred that the screw be screwed—for example, rotated about 2 turns—into the internal threads of the nut. This initially causes the fastening screw to loosen and tighten within the nut. The screw is surrounded by an actuator, which, in this step of the fastening method, moves forward toward the flange assembly along with the screw. The actuator includes protrusions, or projections, on its end face that can cooperate with recesses on the rear side of the nut. Preferably, the rear side of the nut is oriented toward the sawing device during fastening. The rear side of the nut may include, for example, five recesses, wherein any other number of recesses or cutouts may also be provided, which may be distributed around the circumference of the nut. For example, one, two, three, four, five, six, seven, eight, nine, or ten recesses may be arranged on the circumference of the rear side of the nut to cooperate with the protrusions on the end face of the actuator. The end face of the actuator is preferably oriented toward the flange assembly. According to the invention, preferably, the number of protrusions on the driver corresponds to the number of recesses on the rear side of the nut. The cutting portions or recesses preferably have bevels through which the protrusions can slide particularly easily into the recesses. When the protrusions are located in the recesses, the protrusions and recesses support the connection between the sawing device and the flange device. According to the invention, particularly preferably, the protrusions and the recesses interacting with the protrusions are designed to block any relative movement of the saw's drive spindle.

[0033] An annular gap or cylindrical cavity is located between the actuator and the fastening screw. A sleeve can be inserted into this gap or cavity, surrounding the fastening screw and connected to it via threads. At the start of the installation operation, when the screw is pulled out of the drive spindle to its maximum extent, there is almost no overlap between the actuator and the sleeve. However, the actuator and the sleeve overlap in a stop region. In this stop region, a protruding element in the rear region of the actuator engages in a snap-fit ​​connection device of the sleeve, thereby creating a connection between the actuator and the sleeve. The snap-fit ​​connection device is preferably located in the front region of the sleeve, such that the actuator and the sleeve exhibit minimal overlap at the start of the tightening or installation operation due to the arrangement of the protruding element and the snap-fit ​​connection device, wherein this overlap is preferably formed by the stop region between the actuator and the sleeve. The snap-fit ​​connection between the actuator and the sleeve prevents the fastening screw from being pulled further out of the drive spindle. During the tightening operation, or during the installation operation, the fastening screw connected to the sleeve is further screwed into the nut, i.e., the screw is further "forward" toward the flange assembly. Due to the connection between the screw and the sleeve, the sleeve also undergoes this movement, wherein the sleeve is particularly pushed into the interior between the screw and the actuator until the sleeve is almost completely—except for the rear region of the sleeve—arranged in the cavity or gap between the actuator and the fastening screw. In other words, the sleeve is almost completely received by the actuator or its interior. According to the invention, it is preferred that the sleeve can be press-fitted and / or adhesively engaged.

[0034] The sleeve is preferably surrounded by a spring, which, according to the invention, is preferably referred to as a "first spring." The spring is spaced apart from the sleeve such that when the sleeve is pushed into the drive during the fastening or installation process, the spring also surrounds the drive. In other words, the inner diameter of the first spring is larger than the outer diameter of the rear region of the drive, such that at the end of the installation process, when the flange assembly is fastened to the drive spindle or sawing device, the first spring surrounds the rear region of the drive. According to the invention, preferably, the first spring is unloaded at the beginning of the installation process and is compressed or stretched during the installation of the flange assembly. At the end of the installation process, when the flange assembly is fastened to the sawing device, the first spring is loaded or tensioned, in which state the first spring is preferably configured to store a certain amount of spring or tensile energy. The spring, in particular, stretches and contracts from the rear region of the sleeve toward the front and is thus loaded.

[0035] This extension and retraction of the first spring is preferably combined with the tightening of the fastening screw into the nut of the flange assembly. Since the nut is designed to move laterally within the flange body of the flange assembly, it travels backward within the hollow interior of the flange body, thus—turn by turn—leaving the interior of the flange assembly. At the end of the installation process, approximately half of the nut has left the interior of the flange body of the flange assembly. Any further departure of the nut is prevented by a stop formed between the protruding element of the nut and the protruding element of the flange body. According to the invention, preferably, the stop is located near the drive spindle.

[0036] According to the invention, preferably, the nut, fastening screw, actuator, first spring, and sleeve are compressed or screwed together by a fastening or installation method. Tests have shown that the proposed method, using the proposed flange device and the proposed sawing system, provides the possibility of providing a particularly stable, secure, and easy-to-clean fastening of the flange or saw blade to the sawing device or its drive spindle.

[0037] According to the present invention, preferably, the flange device can be in a closed state and an open state. Preferably, in the closed state, the saw blade can be fastened to the flange device, while in the open state, the saw blade is preferably separated from the flange device.

[0038] In the context of this invention, the fastening screw is movably arranged in the saw. The fastening screw can be pressed in particular, opposite to the spring, which, according to the invention, is referred to as the "second spring," towards the flange device. As a result, the front portion of the fastening screw protrudes a length l from the sawing device in the closed state, wherein this protruding portion is received by the internal thread of the nut of the flange device. According to the invention, this preferably means that the front portion of the fastening screw does not terminate flush with the front or receiving side of the sawing device, but rather protrudes beyond or from this front side. According to the invention, preferably, the surface of the sawing device that contacts the flange device during fastening is referred to as the "front or receiving side of the sawing device." Preferably, the front or receiving side is formed in a substantially flat or planar manner.

[0039] According to the invention, preferably, in the open state of the flange device, the fastening screw terminates substantially flush with the receiving side of the sawing device, while in the closed state, the fastening screw is pulled out of the sawing device by the nut. The open state preferably represents the starting point of the fastening and installation method explained above and preferably also referred to as the "closed method" according to the invention. According to the invention, preferably, in the closed state of the flange device, the protruding front region of the fastening screw is received by the nut of the flange device or enclosed by the inner region of the nut. For this purpose, the fastening screw can be screwed into the internal thread of the nut. As a result, a connection is established between the flange device and the fastening screw of the sawing device, which is used to fasten the flange device to the sawing device. The saw blade can be fastened to the flange device using fastening members such as screws, by which the saw blade can be screwed onto the flange device, particularly the flange body.

[0040] According to the invention, preferably, the nut of the flange device, constructed in a movable manner, can move toward the sawing device in the closed state, and in this state encloses the protruding area of ​​the fastening screw. Due to this movement toward the sawing direction, a cavity appears between the nut and the centering ring of the flange device, which is filled by the nut in the open state of the flange device. According to the invention, preferably, this cavity coincides with the interior of the flange body, in which the nut can move. In the context of the invention, the terms "forward" or "backward" do not refer to terms that are not clear to those skilled in the art. According to the invention, the terms "front" and the spatial direction "forward" preferably correspond to the area in which the flange device is arranged in the closed state of the sawing system. According to the invention, the terms "rear" and the spatial direction "backward" correspond to the area in which, for example, the head of the fastening screw is present. Therefore, "backward" movement preferably proceeds toward the rear region of the fastening screw, while "forward" movement preferably proceeds toward the flange device.

[0041] According to the invention, preferably, in the open or closed state of the flange device, the nut terminates substantially flush with the top and bottom sides of the flange body inside the flange body. According to the invention, this preferably means that the height of the nut substantially corresponds to the height of the flange body. To the outside, i.e., towards the possible location of the saw blade, the nut is covered by the centering ring of the flange device. In other words, the centering ring of the flange device is designed to close the interior of the flange body (preferably also referred to as a cavity) to the outside, such that the nut is not visible from the outside in the preferred configuration of the invention and is protected by the centering ring. According to the invention, preferably, the centering ring is designed to center the saw blade on the flange body of the flange device.

[0042] According to the invention, preferably, in the open state of the flange device, the nut is arranged between the centering ring of the flange device and the receiving side of the sawing device, while in the closed state, the nut moves in the direction of the saw and, together with the centering ring of the flange device, encloses the cavity. In other words, in the context of the invention, it is preferable that, in the open state, the saw's fastening screw and the nut of the flange device can be positioned relative to each other such that the fastening screw and the nut do not contact each other, while in the closed state, the nut encloses the fastening screw, and thus establishes a connection between the flange device and the saw. The enclosure is achieved in particular by the fastening screw being screwed into the internal thread of the nut.

[0043] According to the invention, preferably, the first spring is arranged around the fastening screw in the sawing device, and the first spring is designed to press the actuator onto the nut of the flange device.

[0044] Preferably, the fastening screw is surrounded by a sleeve. A first spring of the system may preferably be disposed outside this sleeve, but surrounding the fastening screw. This first spring is preferably designed to press the actuator onto the nut.

[0045] According to the invention, preferably, the second spring is present in the sawing device near the fastening screw, wherein the second spring is designed to press the fastening screw away from the flange device.

[0046] The spring force of the second spring is preferably used to move the fastening screw. In particular, the fastening screw can be moved in the opposite direction to the second spring toward the flange device, such that the front region of the fastening screw protrudes beyond the front side of the saw, wherein this protruding region of the fastening screw is received or enclosed by the nut of the flange device when the flange device is closed.

[0047] According to the invention, preferably, the second spring is arranged close to the sleeve surrounding the drive spindle. This sleeve preferably has a side facing the flange assembly and a side facing the sawing device. These sides can also preferably be referred to as the front and rear sides of the sleeve. According to the invention, preferably, the second spring is arranged on the side of the sleeve facing the sawing device, wherein this side corresponds to the side of the sleeve facing away from the flange assembly.

[0048] According to the present invention, preferably, the first spring and the second spring have a reset function and are designed to move the driver or fastening screw to its respective starting position.

[0049] According to the present invention, it is preferred that the first spring is a stronger or stiffer spring than the second spring. In other words, the first spring may have a greater spring stiffness than the second spring. According to the present invention, it is also preferred that the spring stiffness of the first spring is the same as or substantially the same as the spring stiffness of the second spring.

[0050] According to the invention, preferably, the flange body of the proposed flange assembly has a centering groove on its outer edge. Preferably, the centering groove is in the form of an annular groove, and the annular groove cooperates with elements on the blade guard retainer to achieve easier saw blade installation and optimal pre-positioning. These elements of the blade guard retainer can be, for example, web strips arranged inside the retainer for pre-centering. As an alternative to the web strips, sleeves with collars can be used, wherein the web strips or sleeves can be formed continuously or intermittently. The protruding areas of the web strips or sleeves can engage with and thus guide the annular groove. In this way, pre-centering of the flange assembly can be achieved, in particular.

[0051] According to the invention, preferably, when the flange device is used to fasten the saw blade to the sawing device, the flange device is located between the saw arm and the saw blade of the sawing device. In this regard, in another aspect, the invention also relates to the use of a flange device for fastening a saw blade to a sawing device, wherein the flange device is located between the saw arm and the saw blade of the sawing device during the fastening process.

[0052] The following provisions are made: the proposed system comprises the proposed flange assembly, a sawing device, and a center tightening device. The center tightening device may in particular be a screw, which, according to the invention, may also be referred to as a "fastening screw." The proposed system may preferably be referred to as a "sawing system."

[0053] According to the invention, preferably, the central tightening device of the system has a threadless lug for locating the threaded hole in the nut, which is movably arranged in the flange assembly. As a result, it is easier to bring the nut and fastening screw together, which is particularly advantageous when combined with the significant weight that may occur with the sawing device.

[0054] Preferably, the center turning device can have a radial clearance in the drive spindle of the sawing device. According to the invention, preferably, the clearance width is in the range of 0.1 mm to 1 mm, more preferably in the range of 0.3 mm to 0.8 mm, more preferably in the range of 0.4 mm to 0.6 mm, and most preferably 0.5 mm. This selection of the clearance width allows for the compensation and easy correction of angular errors during saw blade installation or replacement in a particularly simple manner.

[0055] According to the invention, preferably, the central tightening device or fastening screw is in the form of an expansion screw. In this way, undesirable and safety-related loosening of the connection between the saw blade and the flange assembly or between the saw blade and the sawing device is effectively prevented.

[0056] According to the invention, preferably, if the fastening screw undesirably comes loose from the flange assembly, the seal between the spindle and the central fastening screw becomes loose, and water can be seen flowing out. In this way, the user of the sawing device will quickly be informed that the central tightening device may be loose, and thus this can be quickly remedied.

[0057] In one possible configuration, the system may include a serrated shaft connection for centering the flange assembly. The serrated shaft connection specifically allows for connection and centering between the fastening screws, nuts, and flange assembly in the spindle of the sawing device.

[0058] According to the invention, preferably, the serrated shaft connection has a special introduction geometry that allows for improved introduction of the nut into the spindle. Specifically, due to the special guidance, the teeth of the serrated shaft connection engage better with each other. According to the invention, preferably, the serrated shaft connection has an internal geometry and an external geometry, wherein the external geometry exists on the nut and the internal geometry exists on the spindle. The special introduction geometry facilitates the introduction of the nut into the spindle and effectively prevents the part from tilting.

[0059] Furthermore, compared to conventional flange devices, the serrations allow for particularly robust centering and better force transmission. In particular, the proposed flange is operated without slotting, resulting in exceptional stability and durability. Another advantage of this invention is that centering and rotation are performed within the flange, thus improving safety when the sawing device begins operation.

[0060] According to the invention, preferably, the system has an adjustable blade guard retainer. The advantage of the proposed system is that, because the blade guard retainer is preferably constructed in an adjustable manner, the saw blade can be locked in place. This is not typically the case in conventional sawing systems known in the prior art. According to the invention, preferably, the blade guard retainer can be secured or locked in three different positions by a retaining pin. In particular, the blade guard retainer can be adjusted relative to the saw arm at -45 degrees, 0 degrees, or +45 degrees. In the unlocked state, the blade guard retainer can be adjusted in 360 degrees.

[0061] In another possible embodiment of the invention, the system may have a water guide that extends substantially centrally through the drive spindle of the sawing device. In the rear region of the fastening screw, the fastening screw is surrounded by an annular disc, which is secured between the fastening screw and the drive spindle. According to the invention, preferably, the disc includes cut portions on its circumference, through which water required by the water guide can flow to deliver it to the region of the saw blade.

[0062] In conventional sawing systems known in the prior art, the supply of liquid for cooling the saw blade typically extends through the blade guard retainer of the sawing device. A novel water guide, extending substantially centrally through the drive spindle of the sawing device, allows the coolant, preferably cooling water, optionally with additives, to be advantageously used for rinsing and thus cleaning the surrounding components of the system. According to the invention, it is particularly preferred that the teeth of the saw-tooth shaft connection be rinsed with liquid supplied by the water guide, and in this way, these teeth can be kept particularly clean. Tests have shown that the interface between the saw blade and the saw can be cleaned substantially continuously, especially during sawing operation, by the water supply extending within the spindle.

[0063] The proposed invention is particularly advantageous in that it operates without easily dislodged parts and is especially easy to maintain and repair. In particular, it eliminates the need for relubrication, as is customary in some flange assemblies known in the prior art.

[0064] Further advantages of the invention will become apparent from the following description of the accompanying drawings. Exemplary embodiments of the invention are illustrated in the drawings. The drawings, description, and claims contain numerous combinations of features. Those skilled in the art will also readily consider these features individually and combine them to form other useful combinations. Attached Figure Description

[0065] In the accompanying drawings, identical and similar parts are indicated by the same reference numerals. In the accompanying drawings:

[0066] Figure 1 A view showing a preferred embodiment of the proposed flange device is illustrated;

[0067] Figure 2 A view showing a preferred embodiment of the proposed flange device is illustrated;

[0068] Figures 3 to 6 A view showing a preferred embodiment of the proposed flat-cut flange in the open state;

[0069] Figures 7 to 10 A view showing a preferred embodiment of the proposed flat-cut flange in a closed state;

[0070] Figure 11 Various preferred embodiments of the proposed flat-cut flange are shown;

[0071] Figure 12 illustrates the steps of a preferred embodiment of the proposed fastening method;

[0072] Figure 13 Another preferred embodiment of the proposed flat-cut flange is shown. Detailed Implementation

[0073] Figure 1 and Figure 2 A view of a preferred embodiment of the proposed flange assembly 1 is shown. Specifically, the flange body 7 and the centering ring 5 are... Figure 1 and Figure 2 As can be clearly seen, the central ring 5 covers the cavity 8, and the nut 6 of the flange device 1 can be arranged in the cavity (the open state of the flange device 1). Figure 2 The flange assembly 1 is shown from the side, allowing the centering groove 10, which extends circumferentially around the flange body 7, to be seen. Specifically, Figure 1 and Figure 2 A blade guard retainer 14 is shown, which is preferably adjustable within an angle range of 90 degrees or 90°.

[0074] Figures 3 to 6 Views of a preferred embodiment of the proposed flat-cut flange 1 in the open state are shown. They show the flange body 7, which can be fastened to the receiving side 18 of the sawing device 4. The connection between the flange body 7 and the centering ring 5 is established by a fastening member 9. The centering ring 5 covers a cavity 8 in which a nut 6 is located when the flange device 1 is open. In the sawing device 4, a fastening screw 3 is located inside the drive spindle 11, the screw being rotatable about a rotation axis 21. The fastening screw 3 is surrounded in a central region by a sleeve 19. Springs 16 and 17 are arranged in the region of the sleeve 19, wherein the second spring 17 is designed to press the saw blade 2 against the substrate to be processed, while the first spring 16 is designed to press the fastening screw 3 toward the flange device 1.

[0075] In the open state, the fastening screw 3 is retracted into the sawing device 4, while the nut 6 of the flange device 1 is arranged in the cavity 8 inside the flange body 7. According to the invention, it is particularly preferred that the nut 6 of the flange device 1 is constructed in a movable manner, while the drive spindle 11 is rigidly arranged in the pivot arm 12 of the saw 4.

[0076] Figures 7 to 10 A view of a preferred embodiment of the proposed flat-cut flange 1 in its closed state is shown. In this state, the fastening screw 3 is pressed towards the flange assembly 1 by the first spring 16, such that the front portion of the fastening screw 3 exists within the nut 6. In other words, the nut 6 surrounds the front portion of the fastening screw 3 to establish a connection between the saw 4 and the flange 1. In this case, the nut 6 also moves towards the saw, resulting in a cavity 8 in the flange assembly 1 below the centering ring 5.

[0077] exist Figure 6 and Figure 9The image shows a serrated shaft connection 13 between the nut 6 and the spindle 11. The nut 6 has the external geometry of the serrated shaft connection 13, while the drive spindle 11 has the internal geometry of the serrated shaft connection 13. When the flange 1 is fastened to the saw 4, the external and internal geometries can engage with each other, allowing torque to be transmitted from the spindle 11 to the flange 1 or to the saw blade 2.

[0078] Figure 11 Various possible configurations of flange device 1 are shown.

[0079] Figure 12 illustrates the steps of the proposed method for fastening the saw blade 2 to the sawing device 4. This fastening is preferably performed using a flange device 1 as presented in the context of this invention. Figure 12 should be read from bottom to top, with the bottom... Figure 12a The diagram illustrates a sawing device 4 with a drive spindle 11, fastening screws 3, and flange device 1, as provided in steps a)–c) of the proposed method. According to the invention, preferably, in the open state, which serves as the starting point of the fastening method, the nut 6 of the flange device 1 is substantially completely received within the interior 8 of the flange body 7 of the flange device 1, and the central tightening device 3 is substantially completely arranged within the drive spindle 11. The term "open state" describes the following state of the sawing system 20, in which the flange device 1 and the saw 4 are initially separated from each other and can be brought close to each other to fasten the flange 1 to the saw 4. In this respect, the open state is considered the starting point of the proposed fastening method.

[0080] exist Figure 12b The image shows a central tightening device 3 being introduced into the internal thread of a nut 6, wherein, as a result, the driver 22 of the sawing device 4 engages with the nut 6 of the flange device 1. Preferably, the driver 22 may include a protrusion 23 that engages in a recess in the nut 6 of the flange device 1. The protrusion 23 is preferably present on the end face of the driver 22 opposite to the rear side of the nut 6, and the recess is preferably present in the rear side.

[0081] Figure 12c The fastening screw 3 is shown continuing to be screwed into the internal thread of the nut 6 of the flange device 1. According to the invention, preferably, the sleeve 19 of the saw 4 is introduced into the gap between the driver 22 and the central tightening device 3, and the first spring 16 is compressed.

[0082] Figure 12dThe diagram shows the center tightening device 3 continuing to tighten into the internal thread of the nut 6, resulting in the nut 6 of the flange device 1 being pulled onto the fastening screw 3. According to the invention, preferably, the nut 6 is pulled out of the flange body 7 of the flange device 1 until a closed or tightened state is established, because the stop is reached and the external thread of the center tightening device 3 is substantially fully received in the nut 6 of the flange device 1.

[0083] Figure 13 A preferred embodiment of the proposed flat-cut flange 1 is shown, wherein the flange assembly 1 is arranged immediately adjacent to the sawing device 4. The fastening screws 3 have been pulled back as far as possible; the nut 6 of the flange assembly 1 is substantially entirely located inside the flange 1 or the flange body 7. This state is considered the open state or the starting point of the proposed fastening method. As the fastening screws 3 are screwed into the nut 6 of the flange assembly 1, the flange 1 can be fastened to the saw 4.

[0084] The sawing device 4 includes a drive spindle 11 that surrounds a sleeve 19 and springs (16, 17); and a driver 22 with a protrusion 23. The drive spindle 11 is rotatable about a rotation axis 21 that extends centrally through a fastening screw 3. The saw blade 2 (not shown) can be fastened to the flange device 1 by fastening screws 9, wherein other fastening members 9a are provided to establish a connection between the centering ring 5 and the flange body 7 of the flange 1.

[0085] List of reference numerals

[0086] 1. Flange assembly

[0087] 2. Saw blade

[0088] 3. Center Tightening Device

[0089] 4. Sawing device

[0090] 5 pairs of Central

[0091] 6 nuts

[0092] 7 Flange body

[0093] 8. The interior and cavity of the flange body

[0094] 9 Fastening components

[0095] 10 pairs of intermediate tanks

[0096] 11 Drive spindle

[0097] 12 saw arms

[0098] 13. Sawtooth shaft connection

[0099] 14 Blade Guard Retainer

[0100] 15 Water Diverter

[0101] 16 First Spring

[0102] 17 Second Spring

[0103] 18 Receiving side

[0104] 19 Sleeves

[0105] 20 System

[0106] 21. Axis of rotation

[0107] 22 drives

[0108] 23 convex part

Claims

1. A flange device (1) for fastening a saw blade (2) to a drive spindle (11) of a sawing device (4), wherein the flange device (1) has a centering ring (5), a nut (6) and a flange body (7). Its features are, The flange body (7) has a first side that contacts the saw blade (2) and an opposite second side that contacts the sawing device (4) and has a cavity (8) in which the nut (6) is movably arranged. The centering ring (5) is fastened to the flange body (7) on the first side by a fastening member (9). In the closed state of the flange device (1), the nut (6) can move to extend outward from the second side to fasten the flange device (1) to the sawing device (4).

2. The flange device (1) as described in claim 1. Its features are, With the flange device (1) in the open state, the nut (6) terminates in a manner that is substantially flush with the second side.

3. The flange device (1) as described in claim 1 or 2. Its features are, The flange body (7) has a centering groove (10) on its outer edge.

4. The flange device (1) as described in claim 1 or 2. Its features are, The nut (6) has an internal thread for connection to the drive spindle (11) via a central screwing device (3).

5. A system (20) for securing a saw blade (2) to a drive spindle (11) of a sawing device (4). Its features are, The system (20) has a flange device (1) as described in any one of claims 1 to 4, a sawing device (4), and a central tightening device (3) for pulling the nut (6) from the open state to the closed state.

6. The system (20) as described in claim 5. Its features are, The central screwing device (3) has a threadless lug for locating the threaded hole in the nut (6).

7. The system (20) as described in claim 5 or 6. Its features are, The central turning device (3) has a radial clearance in the drive spindle (11) of the sawing device (4).

8. The system (20) as described in claim 7. Its features are, The gap width is in the range of 0.1 mm to 1 mm.

9. The system (20) as described in claim 8. Its features are, The gap width is in the range of 0.3 mm to 0.8 mm.

10. The system (20) as described in claim 8. Its features are, The gap width is in the range of 0.4 mm to 0.6 mm.

11. The system (20) as described in claim 8. Its features are, The gap width is 0.5 mm.

12. The system (20) as described in claim 5 or 6. Its features are, The central screwing device (3) is in the form of an expansion screw.

13. The system (20) as described in claim 5 or 6. Its features are, The system (20) includes a serrated shaft connection (13) for centering the flange device (1).

14. The system (20) as described in claim 5 or 6. Its features are, The system (20) has an adjustable blade guard retainer (14).

15. The system as described in claim 5 or 6, Its features are, The system (20) has a water guide (15) that extends at the center through the drive spindle (11) of the sawing device (4).

16. The system (20) as described in claim 5 or 6. Its features are, A first spring (16) is arranged to rotate the device (3) around the center, and the first spring (16) is designed to press the saw blade (2) onto the substrate to be processed.

17. The system (20) as described in claim 6. Its features are, A second spring (17) is present near the central screwing device (3), wherein the second spring (17) is designed to press the drive spindle (11) toward the flange device (1).

18. A method for securing a saw blade (2) to a drive spindle (11) of a sawing device (4), wherein the method comprises the following steps: a) Provide a sawing device (4) with a drive spindle (11). b) Provide a center screwing device (3). c) A flange device (1) as described in any one of claims 1 to 4 is provided, wherein, in the open state, the nut (6) of the flange device (1) is fully received in the cavity (8) of the flange body (7) of the flange device (1) and the center tightening device (3) is fully arranged within the drive spindle (11). d) The center screwing device (3) is introduced into the internal thread of the nut (6), resulting in the actuator (22) engaging with the nut (6) of the flange device (1). e) Continue to screw the center screwing device (3) into the internal thread of the nut (6), f) Continue to screw the center screwing device (3) into the internal thread of the nut (6), and as a result, the nut (6) of the flange device (1) is pulled onto the center screwing device (3).

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