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

Abstract

A flange device and to a method for fastening a saw blade to a drive spindle of a sawing device. Among other things, the flange device includes a nut, which is arranged in a movable manner in an interior of a flange body, wherein, in a closed state of the flange device, the nut surrounds a central screwing device, which is guided in the drive spindle, for the purpose of fastening. A system for fastening a saw blade to a drive spindle of a sawing device, wherein the system has a flange device, and 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, such that, in the closed state, it can be received by an interior of the nut of the flange device.

Claims

1-15. (canceled)

16: A flange device for fastening a saw blade to a drive spindle of a sawing device, the flange device comprising: a centering ring; a nut; and a flange body forming an outer region of the flange device, the nut being arranged in a movable manner in an interior of the flange body, wherein the centering ring being fastened to the flange body by at least one fastener, and wherein, in a closed state of the flange device, the nut surrounding a central screwing device guided in the drive spindle for the purpose of fastening.

17: The flange device as recited in claim 16 wherein in an open state of the flange device, the nut terminates in a flush manner with a top side and an underside of the flange body in the interior.

18: The flange device as recited in claim 16 wherein the flange body has a centering slot on an outer edge.

19: The flange device as recited in claim 16 wherein the flange device is present between a saw arm of the sawing device and the saw blade when the flange device is used to fasten the saw blade to the sawing device.

20: A system for fastening a saw blade to a drive spindle of a sawing device, the system comprising: the flange device as recited in claim 16, and the sawing device and the central screwing device.

21: The system as recited in claim 20 wherein the central screwing device has a threadless lug for finding a threaded bore in the nut.

22: The system as recited in claim 20 wherein the central screwing device has a radial clearance in the drive spindle of the sawing device.

23: The system as recited in claim 22 wherein the radial clearance has a clearance width in a range from 0.1 to 1 mm.

24: The system as recited in claim 23 wherein the radial clearance has a clearance width in a range from 0.3 to 0.8 mm.

25: The system as recited in claim 24 wherein the radial clearance has a clearance width in a range from 0.4 to 0.6 mm.

26: The system as recited in claim 24 wherein the radial clearance has a clearance width of 0.5 mm.

27: The system as recited in claim 20 wherein the central screwing device is in the form of an expansion screw.

28: The system as recited in claim 20 further comprising a serrated shaft connection for centering the flange device.

29: The system as recited in claim 20 further comprising an adjustable blade guard holder.

30: The system as recited in claim 20 further comprising a water guide extending substantially centrally through the drive spindle of the sawing device.

31: The system as recited in claim 20 further comprising a first spring arranged around the central screwing device, the first spring being designed to press the saw blade onto a substrate to be worked.

32: The system as recited in claim 31 further comprising a second spring in the vicinity of the central screwing device, wherein the second spring is designed to press the drive spindle in the direction of the flange device.

33: The system as recited in claim 5 further comprising a spring in the vicinity of the central screwing device, wherein the spring is designed to press the drive spindle in the direction of the flange device.

34: A method for fastening a saw blade to a drive spindle of a sawing device, the method comprising the following steps: a) providing a sawing device having a drive spindle, b) providing a central screwing device, c) providing the flange device as recited in claim 1, wherein, in an open state, which is the starting point for the fastening method, the nut of the flange device is received entirely in the interior of the flange body of the flange device and the central screwing device is arranged substantially entirely inside the drive spindle, d) introducing the central screwing device into an internal thread of the nut, with the result that a driver comes into engagement with the nut of the flange device, e) continuing to screw the central screwing device into the internal thread of the nut, and f) continuing to screw the central screwing device into the internal thread of the nut, with the result that the nut of the flange device is drawn onto the central screwing device.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Further advantages of the invention will become apparent from the following description of the figures. Exemplary embodiments of the present invention are illustrated in the figures. The figures, the description and the claims contain numerous features in combination. A person skilled in the art will expediently also consider the features individually and combine them to form useful further combinations.

[0063] In the figures, identical and similar components are denoted by the same reference signs. In the figures:

[0064] FIG. 1 shows a view of a preferred embodiment of the flange device

[0065] FIG. 2 shows a view of a preferred embodiment of the flange device

[0066] FIGS. 3, 4, 5 and 6: show views of a preferred embodiment of the flush-cut flange in an open state

[0067] FIGS. 7, 8, 9 and 10: show views of a preferred embodiment of the flush-cut flange in a closed state

[0068] FIGS. 11s and 11b show various preferred embodiments of the flush-cut flange

[0069] FIGS. 12a, 12b, 12c, 12d show a sequence of a preferred embodiment of the fastening method

[0070] FIG. 13 shows a further preferred embodiment of the flush-cut flange

DETAILED DESCRIPTION

[0071] FIGS. 1 and 2 show views of a preferred embodiment of the flange device 1. In particular, the flange body 7 and the centering ring 5 are apparent in FIGS. 1 and 2, wherein the centering ring 5 covers a cavity 8 in which the nut 6 of the flange device 1 can be arranged (open state of the flange device 1). FIG. 2 illustrates the flange device 1 from the side, such that the centering slot 10 can be seen, which extends around the circumference of the flange body 7. In particular, FIGS. 1 and 2 show a blade guard holder 14, which can preferably be adjusted in an angular range of 90 degrees, or 90°.

[0072] FIGS. 3 to 6 show views of a preferred embodiment of the flush-cut flange 1 in an open state. They illustrate the flange body 7, which can be fastened to a receiving side 18 (see, e.g, FIGS. 3 and 5) of the sawing device 4. A connection between the flange body 7 and centering ring 5 is established by fastening means 9a, with 9 indicating connectors for the saw blade. The centering ring 5 covers a cavity 8 (see, e.g., FIG. 9) in which the nut 6 is located in the open state of the flange device 1. In the sawing device 4, a fastening screw 3 is located in the interior of the drive spindle 11, said screw being able to rotate about an axis of rotation 21 (see, e.g, FIG. 7). The fastening screw 3 is surrounded in a central region by a sleeve 19. Arranged in the region of the sleeve 19 are springs 16, 17 (see, e.g, FIG. 12d), wherein a second spring 17 is designed to press the saw blade 2 (shown solely schematically in FIG. 3) onto a substrate to be worked, while the first spring 16 is designed to press the fastening screw 3 in the direction of the flange device 1.

[0073] In the open state, the fastening screw 3 is retracted in the sawing device 4, while the nut 6 of the flange device 1 is arranged in the cavity 8 in the interior of the flange body 7. According to the invention, it is particularly preferred that the nut 6 of the flange device 1 is configured in a movable manner, while the drive spindle 11 is arranged rigidly in the pivot arm 12 of the saw 4 (see, e.g., FIG. 1).

[0074] FIGS. 7 to 10 show views of a preferred embodiment of the flush-cut flange 1 in a closed state. In this state, the fastening screw 3 is pressed by the first spring 16 in the direction of the flange device 1 such that the front region of the fastening screw 3 is present in an interior of the nut 6. In other words, the nut 6 surrounds this front region of the fastening screw 3 in order to establish a connection between the saw 4 and the flange 1. In this case, the nut 6 also moves in the direction of the saw, such that, in the flange device 1, a cavity 8 arises beneath the centering ring 5 of the flange device 1 (see, e.g., FIG. 9).

[0075] In FIGS. 6 and 9, the serrated shaft connection 13 between the nut 6 and the spindle 11 is illustrated. The nut 6 has an external geometry of the serrated shaft connection 13, while the drive spindle 11 has an internal geometry of the serrated shaft connection 13. When the flange 1 is being fastened to the saw 4, the external geometry and the internal geometry can come into engagement with one another, such that a torque can be transmitted from the spindle 11 to the flange 1, or to the saw blade 2.

[0076] FIGS. 11 and 11b show various possible configurations of the flange device 1.

[0077] FIGS. 12a to 12d show a sequence of the method for fastening a saw blade 2 to a sawing device 4. This fastening preferably takes place using a flange device 1 according to the present invention. FIGS. 12a to 12d should be read from bottom to top, wherein the bottommost FIG. 12a shows the sawing device 4 with a drive spindle 11, the fastening screw 3 and the flange device 1 as are provided according to method steps a)-c) of the present method. According to the invention, it is preferred that, in an open state, which is the starting point for the fastening method, a nut 6 of the flange device 1 is received substantially entirely in an interior 8 of a flange body 7 of the flange device 1 and the central screwing device 3 is arranged substantially entirely inside the drive spindle 11. The “open state” describes the state of the sawing system 20 in which the flange device 1 and saw 4 are initially separated from one another and can be brought into the vicinity of one another in order to fasten the flange 1 to the saw 4. In this regard, the open state is considered to be the starting point for the present fastening method.

[0078] In FIG. 12b, the introduction of the central screwing device 3 into an internal thread of the nut 6 is illustrated, wherein, as a result, a driver 22 of the sawing device 4 comes into engagement with the nut 6 of the flange device 1. Preferably, the driver 22 can comprise cams 23 that engage in pockets in the nut 6 of the flange device 1. The cams 23 are preferably present on an end face of the driver 22, which is opposite the rear side of the nut 6, in which the pockets are preferably present.

[0079] FIG. 12c shows the continued screwing of the fastening screw 3 into the internal thread of the nut 6 of the flange device 1. According to the invention, it is preferred that a sleeve 19 of the saw 4 is introduced into a gap between the driver 22 and the central screwing device 3 and a first spring 16 is compressed.

[0080] FIG. 12d shows the continued screwing of the central screwing device 3 into the internal thread of the nut 6, with the result that the nut 6 of the flange device 1 is drawn onto the fastening screw 3. According to the invention, it is preferred that the nut 6 is drawn out of the interior of the flange body 7 of the flange device 1 until a closed state or fastened state is established in that a stop is reached and an external thread of the central screwing device 3 has been received substantially entirely in the nut 6 of the flange device 1.

[0081] FIG. 13 shows a preferred embodiment of the flush-cut flange 1, wherein the flange device 1 is arranged in the immediate vicinity of the sawing device 4. The fastening screw 3 has been drawn back as far as it can; the nut 6 of the flange device 1 is located substantially entirely in the interior of the flange 1 or of the flange body 7. This state is considered to be the open state or starting point of the present fastening method. As a result of the fastening screw 3 being screwed into the nut 6 of the flange device 1, the flange 1 can be fastened to the saw 4.

[0082] The sawing device 4 comprises a drive spindle 11, which surrounds a sleeve 19 and springs (16, 17), and a driver 22 with cams 23. The drive spindle 11 can rotate about an axis of rotation 21 that extends centrally through the fastening screw 3. The saw blade 2 (illustrated solely schematically in FIG. 3) can be fastened to the flange device 1 by fastening screws 9, wherein other fastening means 9a are provided in order to establish a connection between a centering ring 5 and the flange body 7 of the flange 1.

LIST OF REFERENCE SIGNS

[0083] 1 Flange device [0084] 2 Saw blade [0085] 3 Central screwing device [0086] 4 Sawing device [0087] 5 Centering ring [0088] 6 Nut [0089] 7 Flange body [0090] 8 Interior of the flange body, cavity [0091] 9, 9a Fastening means [0092] 10 Centering slot [0093] 11 Drive spindle [0094] 12 Saw arm [0095] 13 Serrated shaft connection [0096] 14 Blade guard holder [0097] 15 Water guide [0098] 16 First spring [0099] 17 Second spring [0100] 18 Receiving side [0101] 19 Sleeve [0102] 20 System [0103] 21 Axis of rotation [0104] 22 Driver [0105] 23 Cam