Quick holding device for power tool

Abstract

The present application relates to a quick holding device for an electric tool, comprising: at least one fixed holding element fixedly mounted to an output shaft of the electric tool to fixedly assemble it to the output shaft; and a loading mechanism which is held in the axial direction in a clamping position, in which the application tool is clamped and held, or in a release position, in which the application tool is tool-free detached, respectively, the loading mechanism comprising:-an elastic member, an upper push rod portion, and a lower push rod portion, the upper push rod part penetrates through the elastic component and compresses and holds the elastic component between the fixed holding element and the upper end flange of the upper push rod part, and the lower push rod part is configured to be driven to be in an extending position corresponding to the releasing position and return to a retracting position corresponding to the clamping position; the lower pusher portion is configured to pass through the stationary holding element and to receive a securing element for applying a tool. By means of the quick holding device, the application tool can be clamped simply and quickly in a labor-saving mode.

Description

Field of the Invention

[0001] The present invention generally relates to a quick holding device for a power tool, and more particularly, a quick holding device for setting at least one application tool on a power tool. Background Art

[0002] Prior art is known for a quick clamping device for setting at least one plug-in tool on a machine tool, wherein the quick clamping device includes at least one output unit for moving the plug-in tool about an output axis of the output unit and includes at least one fastening unit having at least one movably supported fastening element for axially fastening the plug-in tool to the output unit at least.

[0003] Furthermore, prior art is also known for a quick clamping device for a portable machine tool, in particular an angle grinder, having at least one rotatably drivable output shaft, the quick clamping device having at least one clamping unit having at least one movably supported clamping element for fixing an insert tool unit to the output shaft without tools, for applying a clamping force to the insert tool unit in a clamping position of the clamping element, and the quick clamping device having at least one operating unit for moving the clamping element into the clamping position and / or the release position of the clamping element, in which release position the insert tool unit can be removed from the clamping unit and / or the output shaft.

[0004] In these known solutions, the structure and operation mode of the quick clamping device are often complex and some of the quick clamping devices can only provide clamping for customized application tools. In addition, for some known embodiments of the prior art, the process of replacing the application tool is laborious and time-consuming, which will significantly affect the use efficiency of the machine tool. Summary of the Invention

[0005] According to one aspect of the present invention, the present application relates to a quick holding device for a power tool (1), which is used for clamping and holding an application tool that realizes the function of the power tool. The power tool has a rotatably drivable output shaft, which is configured as a hollow spindle. The quick holding device is characterized in that it includes: - at least one fixed holding element, which is configured to be fixedly installed on the output shaft of the power tool to fixedly assemble the quick holding device into the hollow cavity of the output shaft; - at least one loading mechanism, which is configured to be able to be respectively held in a clamping position or a release position along the axial direction. In the clamping position, the application tool is configured to be clamped and held to the quick holding device so that the application tool can be integrally rotationally driven with the output shaft; and in the release position, the tool is configured to be disassembled from the quick holding device without a tool. At least one loading mechanism at least includes: - an elastic member; - an upper push rod portion, which is configured to pass through the elastic member and compress and hold the elastic member between at least one fixed holding element and the upper end flange of the upper push rod portion; and - a lower push rod portion, which is configured to be driven by the upper push rod portion to an extended position corresponding to the release position and can be reversely driven back to a retracted position corresponding to the clamping position, wherein the lower push rod portion is configured to extend downward through at least one fixed holding element and receive at least one removable mounting and fixing element for holding the application tool at the extended end portion.

[0006] With the quick holding device for a power tool according to the present application, it is possible to simply, quickly and labor - savingly clamp at least one application tool on the basis of ensuring the clamping effect and stability of the application tool. Further, the quick holding device for a power tool of the present application has a simpler and more general structure and can adapt to general application tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Other advantages and aspects of the present application will become more apparent from the following detailed description with reference to the accompanying drawings, in which:

[0008] Figure 1 FIG. shows an overall cross - sectional view of a quick holding device for a power tool in a clamping state according to a first embodiment of the present invention;

[0009] Figure 2 FIG. shows Figure 1 an overall cross - sectional view of a quick holding device for a power tool in a released state as shown in

[0010] Figure 3 FIG. shows Figure 2 a partial cross - sectional schematic view of a quick holding device for a power tool in a released state as shown in

[0011] Figure 4Shows a schematic view of a loading mechanism of a quick-holding device for a power tool according to a first embodiment of the present invention;

[0012] Figure 5 Shows a partial schematic view of a loading mechanism of a quick-holding device for a power tool according to a first embodiment of the present invention; and

[0013] Figure 6 Shows an overall cross-sectional view of a quick-holding device for a power tool in a released state according to a second embodiment of the present invention. Detailed Description

[0014] In the context of the present application, the same reference numerals denote the same or similar elements or parts.

[0015] First, it is defined here that the axial direction means the direction along which the output shaft of the power tool extends, i.e., the direction along its length, the radial direction is the direction transverse to this axial direction and radial to the axial direction, and the circumferential direction is the circumferential direction around the axial direction in any surface transverse to the axial direction. Further, it should be stated first that in the embodiments of the present application, terms such as "upper", "lower", "left", "right" or similar terms, such as "top", "bottom", "left side", etc., all refer to the relative orientation when the output shaft of the power tool is in a vertical state and the application tool is on the side closer to the ground. Of course, for power tools in other orientations, the above relative orientations may change, but the corresponding mechanisms, structures, methods, etc. corresponding to these changes are still included in the scope claimed in the present application.

[0016] Figure 1 Shows an overall cross-sectional view of a quick-holding device 10 for a power tool 1 in a clamped state according to a first embodiment of the present invention, Figure 2 Shows as Figure 1 shown an overall cross-sectional view of a quick-holding device 10 for a power tool 1 in a released state, and Figure 3 Shows as Figure 2 shown a partial cross-sectional schematic view of a quick-holding device 10 for a power tool 1 in a released state.

[0017] As will be understood, in the clamped state, the application tool 12 is configured to be clamped and held, in particular torsionally held, to the quick-holding device 10 such that the application tool 12 can be rotationally driven integrally with the output shaft 14; and in the released state, the application tool 12 is configured to be easily, in particular tool-free, disassembled from the quick-holding device 10.

[0018] As an example, it can be envisaged that for Figures 1-3The quick-holding device 10 used for the power tool 1 is configured for an angle grinder. However, it is also conceivable that the power tool 1 has other configurations that are meaningful to a person skilled in the art, such as a circular saw, a grinding machine, or the like. The power tool 1 includes a transmission housing for receiving and / or supporting the transmission unit of the power tool 1. The transmission housing is preferably made of a metallic material. However, it is also conceivable that the transmission housing is made of other materials that are meaningful to a person skilled in the art, such as plastic or the like. The transmission unit is preferably configured as a bevel gear transmission. The transmission unit particularly includes a rotatably drivable output shaft 14, and the application tool 12 can be fixed to the output shaft 14 by means of the quick-holding device 10 in particular.

[0019] As Figures 1-3 shown, the power tool 1 has a rotatably drivable output shaft 14. The output shaft 14 is preferably configured as a hollow spindle, and the quick-holding device 10 is at least partially arranged in the hollow spindle. In a manner and method known to a person skilled in the art, a protective cover unit (not described in detail here) can be arranged on the transmission housing. In a manner and method known to a person skilled in the art, an additional handle (not shown in detail here) can be arranged on the transmission housing. The power tool 1 includes a motor housing for receiving and / or supporting the drive unit of the power tool 1. The drive unit is preferably arranged in a manner and method known to a person skilled in the art for driving the output shaft 14 to rotate about the rotational axis of the output shaft by means of a common action with the transmission unit. The rotational axis of the output shaft 14 extends at least substantially perpendicular to the drive axis of the drive unit. The drive unit is preferably configured as an electric motor unit. However, it is also conceivable that the drive unit has other configurations that are meaningful to a person skilled in the art, such as a combustion drive unit, a hybrid drive unit, a pneumatic drive unit, or the like. The power tool 1, the quick-holding device 10, and the application unit that can be received and held in the quick-holding device 10 form a power tool system.

[0020] As Figures 1-3As shown, the quick-holding device 10 for a power tool 1 having a rotatably drivable output shaft 14 includes at least one fixed holding element 16, which is configured to be fixedly mounted to the output shaft 14 of the power tool 1 to fixedly assemble the quick-holding device 10 into the hollow cavity of the output shaft 14. Further, the fixed holding element 16 is configured to fixedly hold the quick-holding device 10 to the hollow output shaft 14 such that the quick-holding device 10 can be rotatably driven together with the output shaft, so as to further drive the clamped application tool 12 to rotate. As an example, the fixed holding element 16 is configured to ensure a stable fit and fixation between the fixed holding element 16 and the output shaft 14 through fixing elements, such as screws or snap-fits or form-fitting components or welds or any other suitable type of any suitable fixing element.

[0021] As Figures 1-3 shown, further, the quick-holding device 10 for a power tool 1 having a rotatably drivable output shaft 14 includes at least one loading mechanism 18, which is configured to be respectively held in a clamping position (or clamping state) or a release position (or release state). In the clamping position, the application tool 12 is configured to be clamped and held, especially torsionally held, to the quick-holding device 10 such that the application tool 12 can be integrally rotatably driven with the output shaft 14; and in the release position, the application tool 12 is configured to be easily, especially tool-free, disassembled from the quick-holding device 10.

[0022] Further, by way of example and not limitation, as Figures 1-3 shown, the at least one loading mechanism 18 includes an elastic member 1802, an upper push rod portion 1804, a lower push rod portion 20, and an optional link structure 1806. The elastic member 1802 is configured to be penetrated by the upper push rod portion 1804 and one end of the elastic member 1802 abuts against the upper end flange of the upper push rod portion 1804. Further, the upper push rod portion 1804 penetrates through the entire elastic member 1802. Further, the elastic member 1802 is compressed and held between the upper end flange of the upper push rod portion 1804 and the fixed holding element 16 in both the release and clamping positions of the at least one loading mechanism 18.

[0023] As Figures 1-3 shown, the at least one loading mechanism 18 further includes a lower push rod portion 20. The lower push rod portion 20 is configured to be driven to an extended position by means of the upper push rod portion and can be reversely driven back to a retracted position. In the extended position, the at least one loading mechanism 18 is in the release position, and in the retracted position, the at least one loading mechanism 18 is driven to the clamping position.

[0024] Although not specifically shown in the drawings of the present application, it can be envisioned that the lower push rod portion 20 can be configured to be integrally formed with the upper push rod portion 1804. In this case, the driving of the upper push rod portion 1804 will be directly converted into the driving of the lower push rod portion 20 (i.e., the upper and lower push rod components are driven synchronously as a whole). In this case, when the upper push rod portion 1804 is further driven downward to overcome the elastic force of the elastic member 1802, this will obviously drive the lower push rod portion 20 downward synchronously, causing the at least one loading structure 18 to be in a released state. When the upper push rod portion 1804 is driven upward in the reverse direction due to the elastic force of the elastic member 1802, this will obviously drive the lower push rod portion 20 upward synchronously, causing the at least one loading structure 18 to return to the clamped state.

[0025] Of course, as Figures 1-3 shown, the lower push rod portion 20 is configured as a separate component from the upper push rod portion 1804, such that when the at least one loading mechanism 18 is driven to move from the clamped position to the released position, the upper end portion of the lower push rod portion 20 is pushed by the lower end portion of the upper push rod portion 1804 and is driven to move downward from the retracted position to the extended position; when the at least one loading mechanism 18 moves back to the clamped position, the lower push rod portion 20 can be driven to move upward by means of a direct or indirect connection at the upper end portion with the lower end portion of the upper push rod portion 1804. In the embodiments hereinafter, generally, the case where the lower push rod portion 20 is configured as a separate component from the upper push rod portion 1804 is described by way of example. Figure 4 Fig. shows a perspective schematic view of the loading mechanism 18 of the quick-holding device 10 for the power tool 1 according to the first embodiment of the present invention. In this embodiment, the lower push rod portion 20 and the upper push rod portion 1804 are configured as separate members. In particular, as Figure 4As shown, the at least one loading mechanism 18 includes a link structure 1806. The other end of the upper push rod portion 1804 passing through the elastic member 1802 is coupled to the link structure 1806. The link structure 1806 includes a link member 1808 and a slider 1810. The link member 1808 is configured such that one end thereof can be pivotally coupled to the end of the upper push rod portion 1804 passing through the elastic member relative to the upper push rod portion 1804 about a pivot axis perpendicular to the rotation axis of the output shaft 14. The slider 1810 is configured to be held in and slide along a slide rail 1602 provided in the fixed holding element 16, and the other end of the link member 1808 is configured to be pivotally coupled to the slider 1810 relative to the slider 1810 about another pivot axis generally parallel to the pivot axis of one end of the link member 1808. Based on this configuration of the loading mechanism 18, the principle of the entire loading mechanism 18 can be understood: when a thrust force acts on the upper end flange of the upper push rod portion 1804 on the side opposite to the elastic member 1802, the elastic member 1802 will be further compressed and drive the upper push rod portion 1804 to move downward. Since the two ends of the link member 1808 are respectively pivotally coupled to the end of the upper push rod portion 1804 passing through the elastic member and the slider 1810 held in the slide rail 1602 along generally parallel pivot axes, the downward movement of the upper push rod portion 1804 will cause the link member 1808 to drive the slider 1810 to move away from the upper push rod portion 1804. In the drawings shown in the present application, the number of sliders 1810 is two and each slides in a slide rail 1602 extending in opposite radial directions across the fixed holding element 16. The link member 1808 and the corresponding slider 1810 can be pivotally connected to each other in any suitable manner and are not limited herein.

[0026] In addition, optionally, as Figure 4 shown, it can be envisaged that the fixed holding element 16 includes an upwardly extending protrusion 1604, which is in the shape of a hollow cylinder and is provided with an opening 1606 allowing the link member 1808 to move up and down therein in the direction aligned with the slide rail 1602 to prevent interference with the movement of the link member 1808 along with the upper push rod portion 1804 and to prevent possible torsion of the link member 1808 relative to the upper push rod portion 1804. In this case, the elastic member 1802 is compressed and held between the upper end flange of the upper push rod portion 1804 and the upper end of the protrusion 1604 of the fixed holding element 16.

[0027] Furthermore, optionally, as Figure 4As shown, the connecting rod member 1808 and the upper push rod portion 1804 are configured to be conveniently connected via a pivot shaft 1812 passing through both of them. The length of the pivot shaft 1812 is configured to be substantially equivalent to the diameter of the hollow interior of the output shaft 14 in which it is received to ensure that the pivot shaft 1812 does not come out of the state of passing through the connecting rod member 1808 and the upper push rod portion 1804 after assembly to ensure the stability of the connection between the two. For this purpose, it can be further contemplated that a defining guide rail or a defining slit 1606 is provided at a position of the protrusion 1604 of the fixed holding element 14 corresponding to the pivot shaft 1812 such that the ends of the pivot shaft 1812 can be inserted into the defining slit 1606 or the defining guide rail respectively to ensure that the upper push rod portion 1804 can only axially displace up and down in the output shaft 14 without torsion.

[0028] With a protrusion 1604 such as Figure 4 shown, it significantly enhances the connection stability between the upper push rod portion 1804 and the connecting rod member 1808, ensuring the reliability of the use of the quick holding device 10.

[0029] As described above, the connecting rod structure 1806 is only optional and can be omitted without departing from the scope of the present application. Of course, for those of ordinary skill in the art, the above-mentioned connecting rod structure 1806 can also be combined in the case where the lower push rod portion 20 can be configured to be integrally formed with the upper push rod portion 1804. In this case, one end of the connecting rod member 1808 of the connecting rod structure 1806 can be pivotally coupled to the end of the upper push rod portion 1804 passing through the elastic member relative to the upper push rod portion 1804 about a pivot axis perpendicular to the axis of rotation of the output shaft 14. Obviously, this end corresponds to the lower end of the upper push rod portion and is integrated with the lower push rod portion 20.

[0030] Figure 5A partial schematic diagram of the loading mechanism 18 of the quick-hold device 10 for a power tool 1 according to a first embodiment of the present invention is shown. The specific construction of the slider 1810 and its possible cooperation with the lower push rod 20 are described in detail below. First, in this figure, the lower push rod 20 and the upper push rod 1804 are constructed as separate components. The slider 1810 is constructed to have an upper inclined surface 1814 that gradually increases in height away from the central axis of the output shaft 14 along the guide rail 1602. In other words, the upper inclined surface 1814 gradually slopes downward (i.e., gradually decreases in thickness) as it approaches the lower push rod 20. Correspondingly, the lower push rod 20 includes a flange 2002 at its upper end. The flange has a lower inclined surface 2004 that is form-fitting with the upper inclined surface 1814 of the slider 1810. In other words, the flange 2002 has a lower surface that gradually slopes upward (i.e., gradually decreases in thickness) as it moves away from the lower push rod 20. With the help of such upper and lower inclined surfaces, when the upper push rod portion 1804 overcomes the elastic force of the elastic member 1802 and is further driven to move vertically downward, the slider 1810 is correspondingly driven to slide away from the lower push rod portion 20 (that is, away from the upper push rod portion), and due to the shape fit of the upper and lower inclined surfaces, the lower push rod portion 20 can be driven downward by the pushing action of the upper push rod portion 1804 and can reach the extended position, and thus enable at least one loading mechanism 18 to reach its release position. Furthermore, with the aid of such upper and lower inclined surfaces, when the upper push rod portion 1804 is driven to move upward in response to the elastic force of the elastic member 1802, the slider 1810 is correspondingly driven to slide close to the lower push rod portion 20 (i.e., close to the upper push rod portion). Due to the shape matching of the upper and lower inclined surfaces, the lower push rod portion 20 can be driven upward by the upper inclined surface 1814 of the slider 1810 pushing the lower inclined surface 2004 of the lower push rod portion 20, thereby returning to the retracted position and enabling at least one loading mechanism 18 to reach its clamping position. With the aid of such a slider structure and the matching between the slider and the lower push rod portion 20, the lower push rod portion 20 and the upper push rod portion 1804 can be further configured to eliminate the direct or indirect connection therebetween. Of course, it is also possible to retain the direct or indirect connection therebetween, thereby increasing the stability of the product and the operational buffer protection.

[0031] Please note that in this Figure 5 In an embodiment, in any position of at least one loading mechanism 18 or more specifically in any position of the lower push rod portion 20, at least a portion of the upper inclined surface 1814 of the slider 1810 is always arranged to contact the corresponding lower inclined surface 2004 of the flange 2002 of the lower push rod portion 20 without the upper and lower inclined surfaces being completely offset from each other.

[0032] An additional displacement limiting device 2008 may be considered to limit the maximum form-fit dimension between the upper and lower inclined surfaces. As Figure 5 shown, the displacement limiting device 2008 is configured to provide a downwardly extending stepped portion from the lower inclined surface at a certain distance from its end close to the slider 1810, and this certain distance is selected such that the length of the lower inclined surface 2004 is not greater than the length of the upper inclined surface 1814 of the slider 1810, and thus the dimension of the slider 1810 sliding into the lower push rod portion 20 is limited, thereby limiting the upward movement degree or distance of the lower push rod portion 20 without damaging the application tool 12 due to over-tight clamping of the application tool 12.

[0033] Figure 6 Fig. shows an overall cross-sectional view of the quick-holding device 10 for the power tool 1 in a released state according to a second embodiment of the present invention. As Figure 6 shown, as a variant, the position limiting device 2008 is configured to provide an upwardly extending stepped portion from the upper inclined surface at a certain distance from its end close to the lower push rod portion 20, and this certain distance is selected such that the length of the upper inclined surface 1814 is not greater than the length of the lower inclined surface 2004 of the lower push rod portion 20, and thus the dimension of the slider 1810 sliding into the lower push rod portion 20 is limited, thereby limiting the upward movement degree or distance of the lower push rod portion 20 without damaging the application tool 12 due to over-tightening.

[0034] As will be understood, in the embodiments of the present application, the elastic member 1802 can upwardly push the upper end flange of the upper push rod portion 1804 with sufficient compressive elastic force when at least one loading mechanism 18 is in the clamping position to hold the slider 1810 reliably enough such that in such a clamping position, the slider 1810 cannot slide along the slide rail 1602 to cause an accidental bounce of the lower push rod portion 20.

[0035] Figure 6 The difference between the embodiment in and the first embodiment in lies in the relative position between the lower push rod portion 20 and the slider 1810 when the lower push rod portion 20 is in the extended position, which will also be described in more detail in the method of operating the quick-holding device 10 for the power tool 1 according to the embodiments of the present application.

[0036] As Figure 6 shown, the lower push rod portion 20 may have a structure similar to the lower push rod portion 20 shown in Figures 1-5 but is different from the embodiment shown in particular in Figure 5 that in the extended position of the lower push rod portion 20, the slider 1810 is configured such that its upper inclined surface 1814 disengages from the corresponding lower inclined surface 2004 of the flange 2002 of the lower push rod portion 20. Further, as Figure 6As shown, in the release position of the quick-holding device 10, the end surface of the slider 1810 on the side close to the lower push rod portion 20 abuts against the outer surface of the flange at the position corresponding to the lower inclined surface 2004 in the lower push rod portion 20. It can be determined that the end surface is preferably arranged to be in shape fit with the corresponding outer surface of the flange. With such a structure, since the elastic member 1802 acts on the upper push rod portion 1804, the slider 1810 has a tendency to move closer to each other and can thus tightly press against the flange of the lower push rod portion 20, so that a significant frictional force can be provided between the slider 1810 and the flange 2002 and the slider 1810 is hindered from moving closer to each other. Therefore, it is possible to prevent the lower push rod portion 20 from being accidentally driven back from the extended position to the retracted position, ensuring safety when installing the application tool 12.

[0037] As Figure 1 and 6 shown and as will be understood by those skilled in the art, the lower push rod portion 20 is also constructed to be arranged non-rotatably relative to the output shaft 14 and can only translate in the axial direction of the output shaft 14. As Figures 1-6 shown, the lower push rod portion 20 is constructed to pass through a through hole 1608 provided at a generally central position of the fixed holding element 16. It can be envisaged that the through hole 1608 can be arranged in an anti-rotation shape (such as square, oval, convex or concave shape combined with a straight line and a curve, polygon, triangle, and any shape that can prevent rotation), and the portion of the lower push rod portion 20 passing through the through hole 1608 is clearly constructed to have a shape generally conforming to the through hole to ensure anti-rotation of the lower push rod portion 20.

[0038] Furthermore, as Figures 1-6 shown, the lower push rod portion 20 is constructed to receive at least one removable mounting and fixing element 2006 for holding the application tool 12 at the end thereof extending out of the through hole. The removable mounting and fixing element 2006 is constructed to clamp and hold the application tool 12 to, in particular, anti-torsionally hold it to the output shaft 14 (i.e., the lower push rod portion 20) in the clamping state of the quick-holding device 10, so that the application tool 12 can be integrally rotationally driven with the output shaft 14 to realize the specific application function of the power tool 1. It can be envisaged that the application tool 12 is a detachable application tool separable from the power tool, which is constructed to be driven by the output shaft 14 to realize the function of the power tool. As an example, in the case where the power tool is an angle grinder, the application tool can be selected as a grinding disc.

[0039] As Figures 1-6As shown, optionally, in an embodiment of the present application, the removable fixing and holding element 2006 can be configured to be removably fixed to a screwed fixing disc at the end of the lower push rod portion 20 extending out of the fixing and holding device 16, which is configured to be screwed to a threaded portion 2010 at the end of the lower push rod portion 20 extending out of the fixing and holding device 16. As an example, in the released state of the quick holding device 10, the screwed fixing disc can preferably be configured to be screwed through the entire length of the threaded portion without tools. In order to ensure that the screwed fixing disc can be screwed through the entire length of the threaded portion each time without being over-tightened or under-tightened, a positioning device for restricting the maximum screwing position of the screwed fixing disc can be provided at the upper end portion of the threaded portion so that the screwed fixing disc can be screwed to a consistent position each time. Of course, as those skilled in the art will understand, the screwed fixing disc is generally disc-shaped and is provided with a threaded hole passing through the screwed fixing disc and having internal threads at its central position.

[0040] As described above, when the lower push rod portion 20 can be driven from the retracted position to the extended position, obviously, the removable fixing and holding element 2006 is configured to be driven from a position close to the fixing and holding element 16 to a position relatively far from the fixing and holding element 16, or vice versa when being driven back from the extended position to the retracted position. Therefore, when the quick holding device 10 is in the clamped state and the lower push rod portion 20 is held in the retracted position, the application tool 12 is clamped and held between the removable fixing and holding element 2006 and the fixing and holding element 16 so that the application tool 12 can be integrally driven by the output shaft. Correspondingly, when the quick holding device is in the released state and the lower push rod portion 20 is held in the driven extended position, the removable fixing and holding element 2006 can no longer clamp the application tool 12 between the removable fixing and holding element 2006 and the fixing and holding element 16, so that the acting force between the removable fixing and holding element 2006 and the application tool 12 is significantly reduced, which obviously helps to disassemble the removable fixing and holding element 2006 such as the screwed fixing disc, thereby realizing the removal or replacement of the application tool 12 without using additional tools.

[0041] Further, as Figures 1-6As shown, the quick-holding device 10 for a power tool 1 having a rotatably drivable output shaft 14 includes at least one operating unit 22 to enable the quick-holding device 10 to be in a clamping position or a release position. The operating unit 22 can be manipulated by an operator. The operating unit 22 is configured as an operating lever. However, in principle, other configurations of the operating unit 22 that are meaningful to those skilled in the art can also be considered, such as configured as a button and / or a pull lever. The operating unit 22 includes a movement axis, in particular a pivot axis, which extends transversely to, in particular at least substantially perpendicular to, the rotation axis of the output shaft 14. The operating unit 22 is preferably pivotally supported about the movement axis, in particular the pivot axis. The operating unit 22 is decoupled from the rotational movement of the output shaft 14. The operating unit 22 includes an eccentric section 2202 for manipulating an intermediate transmission element 2204 of at least one loading mechanism 18. The intermediate transmission element 2204 is supported translatably along the rotation axis, in particular in the output shaft 14 and / or in the transmission housing, and more particularly is supported in the output shaft 14 through the shaft body of the hollow output shaft 14. The intermediate transmission element 2204 is fixed in the transmission housing or the output shaft in a manner that prevents torsion relative to the transmission housing or the output shaft 14, which is particularly achieved based on at least one lateral flattening portion (not shown) of the intermediate transmission element 2204, and the flattening portion enables axial movement and prohibits rotational movement. Preferably, the intermediate transmission element 2204 has at least one flattening portion on each of two opposite sides of the intermediate transmission element. However, it can also be considered that the intermediate transmission element 2204 has other configurations that are meaningful to those skilled in the art, such as a polygonal cross-section, a tooth portion, or the like, which are configured to prevent the torsion of the intermediate transmission element 2204 relative to the transmission housing or the output shaft 104. In the region where the intermediate transmission element 2204 passes through the transmission housing or the output shaft 104, a sealing element (not shown), such as a rubber seal or the like, is preferably arranged to particularly avoid, at least to a large extent, the intrusion of dirt into the transmission housing and / or the hollow output shaft 14. The sealing element preferably abuts against the intermediate transmission element 2204. The intermediate transmission element 2204 is particularly supported movably relative to the sealing element. The intermediate transmission element 2204 slides along at least one sealing surface of the sealing element during its movement relative to the sealing element.

[0042] During the rotational movement of the output shaft 14, the movement of the intermediate transmission element 2204 for transferring at least one loading mechanism 18 of the quick-holding device 10 from the clamping position to the release position is prohibited to the greatest extent, and the movement is caused by the acting force of the operator by means of the intermediate transmission element 2204. When the rotational speed of the output shaft 14 is relatively low or when the output shaft is stationary, the axial force acting on the loading mechanism 18 from the intermediate transmission element 2204 can be transmitted.

[0043] In an alternative embodiment, the intermediate drive element 2204 is configured to drive the upper push rod portion 1804 of at least one loading mechanism 18 to translate downward based on the action of at least one operating unit 22 (such as driving the intermediate drive element 2204 to move downward), and after the driving of the intermediate drive element by at least one operating unit 22 is cancelled (such as the operating unit returning to a position where no driving force is applied to the intermediate drive element 2204), it can return to the initial state based on the action of the upper push rod portion 1804 (such as being pushed by the upper end portion of the upper push rod portion) (such as the operating unit returning to a position where no driving force is applied to the intermediate drive element 2204).

[0044] Further, as Figures 1-6 shown, the quick-holding device 10 includes at least one decoupling unit 24, which is arranged to decouple at least one operating unit 22 from at least one loading mechanism 18 according to the rotational speed of the output shaft 14. The decoupling unit 24 is configured such that a relative movement between at least one decoupling element 2402 of the decoupling unit 24 and the intermediate drive element 2204 is achieved according to the rotational speed of the output shaft 14 for decoupling the operating unit 22 from at least one loading mechanism 18. The decoupling unit 24 at least includes a movably supported decoupling element 2402, which can be transferred into a decoupling position according to the rotational speed of the output shaft 14, in which the operating unit 22 has been decoupled from at least one loading mechanism 18. The decoupling unit 24 is preferably configured as a friction decoupling unit. The decoupling unit 24 at least has a movably supported decoupling element 2402, which can move relative to the output shaft 14 based on the frictional force between the decoupling element 2402 and the intermediate drive element 2204. The decoupling unit 24 at least has a movably supported decoupling element 2402, which is supported movably along and / or around the rotational axis of the output shaft 14 in the hollow interior of the output shaft 14. The decoupling unit 24 at least includes a movably supported decoupling element 2402 and at least one decoupling spring element 2404, which loads the decoupling element 2402 with a spring force in the direction of the operating unit 22. The decoupling unit 24 at least has a movably supported decoupling element 2402 and at least one chute element (not shown), which is used to guide the decoupling element during the relative movement of the decoupling element 2402 relative to the output shaft 14.

[0045] The decoupling element 2402 can be in contact with the intermediate drive element 2204 by means of a force-locking connection, or the decoupling element 2402 is in contact with the intermediate drive element 2204 by means of a force-locking connection. The decoupling element 2402 is preferably supported so as to be translatable along the axis of rotation, in particular in the output shaft 14 or in the upper push rod portion 1804 of at least one loading mechanism 18. The decoupling element 2402 in particular comprises a conical connection region which is at least partially engaged in a groove of the intermediate drive element 2204. The frictional action between the intermediate drive element 2204 and the decoupling element 2402 depends in particular on the configuration of the conical connection region and the spring force of the decoupling spring element 2404. The decoupling spring element 2404 is provided for loading the decoupling element 2402 with a spring force in the direction of the intermediate drive element 2204. The decoupling spring element 2404 is arranged in the upper push rod portion 1804 of at least one loading mechanism 18. The upper push rod portion 1804 is torsionally rigidly arranged in the hollow interior of the output shaft 14. The upper push rod portion 1804 is translatable along the axis of at least one loading mechanism 18. The upper push rod portion 1804 can be loaded with a spring force along the axis, in particular in the direction of the operating unit 22, by means of at least one elastic member 1802 of at least one loading mechanism 18.

[0046] The decoupling unit 24 has at least one connecting element (not shown) which is arranged to connect the decoupling element 2402 and the upper push rod part 1804 in a kinematic manner, in particular at least in a state where the output shaft 14 has a low rotational speed or in a stationary state of the output shaft 14. The connecting element is configured as a pin. The connecting element is arranged, in particular fixed, on the decoupling element 2402. The connecting element can move together with the decoupling element 2402. The connecting element extends into a chute element of the decoupling unit 22. The chute element is configured as a chute guide. The chute element is arranged on the upper push rod part 1804, in particular integrally formed with the upper push rod part 1804. In the case of a rotational movement of the output shaft 14, the decoupling element 2402 and the connecting element can rotate relative to the upper push rod part 1804 based on a braking effect achieved by actuating the intermediate transmission element 2204, wherein the connecting element can move in the chute element configured as a chute guide such that the decoupling element 2402 can move against the spring force of the decoupling spring element 2404 into the guide notch of the upper push rod part 1804. The actuation of the operating unit 22 during the rotational movement of the output shaft 14 can be converted into a movement of the intermediate transmission element 2204 and the decoupling element 2402 relative to the upper push rod part 1804. During the rotational movement of the output shaft 14, the movement of the upper push rod part 1804, which is based on the action of the operating force by means of the operating unit 22 and is for converting the quick holding device 10 from the clamping position to the release position, can be maximally prevented. In the case of a low rotational speed of the output shaft 14 or in a stationary state, the axial force acting on the decoupling element by the intermediate transmission element 2204 can be transmitted to the upper push rod part 1804 by the combined action of the connecting element and the chute element configured as a chute guide. The upper push rod part 1804 can move against the spring force of the elastic member 1802 by means of the operating unit 22. The upper push rod part 1804 is arranged to convert the quick holding device 10 from the clamping position to the release position. Of course, as those skilled in the art will understand, the configuration of the decoupling unit described in this application is merely exemplary and not restrictive, and any suitable decoupling unit configuration that can ensure that the upper push rod part 1804 is not driven to the release position due to the push rod of the intermediate transmission element 2204 during high-speed rotation of the output shaft 14 can be envisioned without departing from the scope of this application.

[0047] Although in the above description, the operating unit 22 is configured to manipulate the intermediate transmission element 2204 of at least one loading mechanism 18 by means of its eccentric section 2202, and further engage and drive the decoupling element 2402 via the intermediate transmission element 2204 to manipulate the upper push rod portion 1894, it is conceivable that the decoupling element 2402 can be omitted and the intermediate transmission element 2204 can be directly integrally connected to the decoupling unit 24. In other words, in this alternative embodiment, the decoupling unit 24 is configured to cancel its decoupling element 2402 and be directly integrally connected to the intermediate transmission element 2204. In this case, the decoupling unit 24 can be referred to as the transmission element driving part 24 because it loses its decoupling ability and is configured as the lower part of the intermediate transmission element 2204 and drives the displacement of the upper push rod portion 1804. In other words, for the embodiments of the present application, the decoupling function is not essential but optional. That is to say, although the decoupling unit 24 is described as having a decoupling ability (by means of the decoupling element), it should be understood that the above-mentioned decoupling unit without the decoupling element (i.e., other structures remain basically unchanged except for the decoupling element) can be directly integrally connected to the intermediate transmission element 2204 without departing from the scope of the present application. In this case, the above-mentioned decoupling unit without the decoupling element is configured as a part of the intermediate transmission element (also referred to as the transmission element driving part 24).

[0048] Although reference is made to the appended Figures 1-6 Specifically described is the specific structure of the quick-holding device 10 of the preferred embodiment of the present application. However, those of ordinary skill in the art should understand that these mechanisms are merely exemplary and can be adaptively modified based on the above disclosure.

[0049] For example, in some embodiments, the other end of the upper push rod portion 1804 passing through the elastic member 1802 can be coupled to the upper end of the lower push rod portion 20.

[0050] Also for example, an additional sealing device is provided between the lower push rod portion 20 and the through hole passing through the fixed holding device 16 to prevent contamination.

[0051] It should be understood that the above various variations or concepts are all included within the scope of the present application.

[0052] Furthermore, the operation process of the quick-holding device 10 of the embodiments of the present application will be further described.

[0053] In the first embodiment of the present application, when the output shaft 14 is in a low-speed or stationary state, at least one loading mechanism 18 of the quick-holding device 10 is driven (for example, by means of the operating unit 22 of the power tool 1 such that the eccentric section 2202 of the operating unit 22 abuts against the upper end of the intermediate transmission element 2204), compressed, and the slider 1810 is thus driven to displace away from the lower push rod portion 20. As a result, the lower push rod portion 20 is also displaced downward by means of the cooperation between the corresponding upper and lower inclined surfaces of the slider 1810 and the lower push rod portion 20 and the pushing of the end of the upper push rod portion 1804. In this case, the distance between the removable fixing holding element 2006 and the fixing holding element 16 becomes larger, and thus the application tool 12 is no longer clamped and held; labor-savingly, even without tools, the removable fixing holding element 2006 can be removed, and thus the application tool 12 can be removed and replaced with another application tool; labor-savingly, even without tools, the removable fixing holding element 2006 can be reset to the desired position, at which time the other application tool is not clamped and held between the removable fixing holding element 2006 and the fixing holding element 16 or there is no application tool; the upper push rod portion 1804 is driven upward by the elastic member 1802 of at least one loading mechanism 18 (for example, by driving the operating unit 22 such that its eccentric section 2202 disengages from the upper end of the intermediate transmission element), and the slider 1810 is thus driven to displace closer to the lower push rod portion 20, and thus the lower push rod portion 20 is also driven to displace upward. In this case, the distance between the removable fixing holding element 2006 and the fixing holding element 16 is reduced, and thus the application tool 12 is clamped and held therebetween. It should be noted that in the operation method of this first embodiment, the upper and lower inclined surfaces always remain in cooperation with each other and do not disengage from each other throughout the operation. In other words, in this first embodiment, the upper and lower inclined surfaces always at least partially contact each other.

[0054] In the second embodiment of the present application, at a low speed or a stationary state of the output shaft 14, at least one loading mechanism 18 of the quick holding device 10 is compressed (for example, by means of the operating unit 22 of the power tool 1 such that the eccentric section 2202 of the operating unit 22 abuts against the upper end of the intermediate transmission element 2204), and the slider 1810 is thus driven to displace away from the lower push rod portion 20. As a result, the lower push rod portion 20 is also displaced downward by means of the cooperation between the slider 1810 and the corresponding upper and lower inclined surfaces of the lower push rod portion 20 and the pushing of the end of the upper push rod portion 1804 until the slider 1810 no longer cooperates with the lower push rod portion 20 via the upper and lower inclined surfaces and the distance between the lower inclined surface and the surface of at least one fixed holding element 16 is less than the minimum thickness of the slider 1810. In this case, the distance between the removable fixed holding element 2006 and the fixed holding element 16 becomes larger, and thus the application tool 12 is no longer clamped; labor-savingly, even without tools, the removable fixed holding element 2006 can be removed, and thus the application tool 12 can be removed and replaced with another application tool; labor-savingly, even without tools, the removable fixed holding element 2006 can be reset to the desired position, at this time the other application tool is not clamped between the removable fixed holding element 2006 and the fixed holding element 16 or there is no application tool; optionally, the operating unit 22 is driven such that its eccentric section 2202 disengages from the upper end of the intermediate transmission element 2204; the lower push rod portion 20 is manually pushed upward (non-limitingly) such that the slider 1810 is again driven under the flange of the lower push rod portion 20 to cooperate with each other via the upper and lower inclined surfaces again; then the additional push is cancelled; and further, the upper push rod portion 1804 is driven upward by means of the elastic member 1802 of at least one loading mechanism 18, and the slider is thus driven to displace close to the lower push rod portion 20, and thus the lower push rod portion 20 is also driven to displace upward. In this case, the distance between the removable fixed holding element 2006 and the fixed holding element 16 is reduced, and thus the application tool 12 is clamped therebetween. Figure 6The embodiments actually provide a protection mechanism that can avoid the quick-holding device inadvertently being in the clamping position due to incorrect operation of the operating unit. When the operating unit is inadvertently driven such that its eccentric section disengages from the upper end of the intermediate transmission element, due to the elastic action of the elastic mechanism 1802, the slider 1810 is driven closer to the lower push rod portion 20. However, since the slider 1810 has already disengaged from the lower push rod portion 20, the end surface of the slider 1810 is prevented from moving further closer to the central axis of the lower push rod portion 20 because it abuts against the outer surface of the flange of the lower push rod portion 20. Therefore, it is prevented that the quick-holding device automatically returns from the release position to its clamping position. When the removable fixed holding element is properly reinstalled and it is necessary to automatically return the quick-holding device 10 from the release position to its clamping position, the lower push rod portion 20 is manually driven upward such that the lower side of its flange is further away from the fixed holding device 16. Thus, the slider 1810 can slide under the flange of the lower push rod portion 20 again and the cooperation of the upper and lower inclined surfaces can be re-established, so that the lower push rod portion can be further automatically and firmly and fully pulled upward, enabling the clamping of the application tool.

[0055] Although an embodiment of manually pushing the lower push rod portion upward is described Figure 6 those of ordinary skill in the art can conceive of other ways to achieve the independent upward driving of the lower push rod portion 20 without departing from the scope of this application. For example, an additional electric drive can be provided such that when it is necessary to automatically return the quick-holding device from the release position to its clamping position, the lower push rod portion can be driven upward electrically or automatically to achieve the clamping state of the quick-holding device.

[0056] The above-described embodiments described in this application are merely exemplary and not restrictive. Those of ordinary skill in the art should understand that they can make various modifications to the above embodiments according to the disclosure of this application without departing from the scope of this application, and these modifications or equivalents also fall within the protection scope of this application.

Claims

1. A quick-holding device (10) for a power tool (1), the quick-holding device (10) being used to clamp and hold an application tool (12) for realizing the function of the power tool (1), the power tool (1) having a rotatably drivable output shaft (14), the output shaft (14) being configured as a hollow spindle, characterized in that, The quick holding device (10) includes: - At least one fixed holding element (16), which is configured to be fixedly mounted to the output shaft (14) of the power tool (1) to fixedly assemble the quick holding device (10) into the hollow cavity of the output shaft (14), - At least one loading mechanism (18), which is configured to be able to be respectively held in a clamping position or a release position along the axial direction. In the clamping position, the application tool (12) is configured to be clamped and held to the quick holding device (10) such that the application tool (12) can be integrally rotationally driven with the output shaft (14); and in the release position, the application tool (12) is configured to be disassembled from the quick holding device (10) without tools. The at least one loading mechanism (18) at least includes: - An elastic member (1802), - An upper push rod portion (1804), which is configured to pass through the elastic member and compress and hold the elastic member (1802) between the at least one fixed holding element (16) and the upper end flange of the upper push rod portion (1804), and - A lower push rod portion (20), which is configured to be driven by the upper push rod portion (1804) to an extended position corresponding to the release position and can be reversely driven back to a retracted position corresponding to the clamping position. Wherein, the lower push rod portion (20) is configured to extend downward through the at least one fixed holding element (16) and receive at least one removable mounting and fixing element (2006) for holding the application tool (12) at the extended end portion.

2. The quick-holding device (10) for a power tool (1) according to claim 1, characterized in that, The at least one loading mechanism (18) further includes a link structure (1806), the link structure includes a link member (1808) and a slider (1810). One end of the link member (1808) is configured to be pivotally coupled to the end portion of the upper push rod portion (1804) passing through the elastic member (1802) relative to the upper push rod portion (1804) about a pivot axis perpendicular to the rotation axis of the output shaft (14), and the other end thereof is configured to be able to pivotally couple to the slider around another pivot axis substantially parallel to the pivot axis of the one end of the link member (1808). Pivot axis relative to the slider (1810).

3. The quick-holding device (10) for a power tool (1) according to claim 2, characterized in that, The slider (1810) is configured to be held in a slide rail (1602) provided in the at least one fixed holding element (16), and the link structure (1806) is further configured to correspondingly drive the slider (1810) to translate horizontally when the upper push rod portion (1804) is driven to move along its axial direction.

4. The quick-holding device (10) for an electric tool (1) according to claim 3, characterized in that, The at least one fixed holding element (16) includes an upwardly extending protrusion (1604), the protrusion is in the shape of a hollow cylinder and is provided with an opening in the direction aligned with the slide rail (1602) to allow the link member (1808) to move up and down therein.

5. The quick-holding device (10) for a power tool (1) according to claim 4, characterized in that, The connecting rod member (1808) and the upper push rod portion (1804) are configured to be connected via a pivot shaft (1812) passing through both of them. The protrusion (1604) is provided with a defined guide rail (1606) at a position corresponding to the pivot shaft (1812) such that the ends of the pivot shaft can be respectively inserted into the defined guide rail (1606) to ensure that the upper push rod portion (1804) can only axially displace up and down in the output shaft (14) without torsion.

6. The quick-holding device (10) for a power tool (1) according to claim 2, characterized in that, The slider (1810) is configured to have an upper inclined surface (1814) that gradually increases away from the central axis of the output shaft (14) along the direction of the slide rail (1602). Correspondingly, a flange (2002) is additionally included at the upper end of the lower push rod portion (20), and the flange has a lower inclined surface (2004) that can cooperate with the upper inclined surface of the slider (1810).

7. The quick-holding device (10) for a power tool (1) according to claim 6, characterized in that, The at least one loading mechanism (18) further includes a displacement limiting device (2008) to limit the maximum form-fit dimension between the upper inclined surface and the lower inclined surface.

8. The quick-holding device (10) for a power tool (1) according to claim 1, characterized in that, The removable fixing and holding element (2006) is configured to be removably fixed to a screwed fixing disk at the end of the lower push rod portion (20) extending out of the at least one fixing and holding device. The screwed fixing disk is configured to be screwed to a threaded portion (2010) provided at the end of the lower push rod portion (20) extending out of the at least one fixing and holding device.

9. The quick-holding device (10) for a power tool (1) according to claim 1, R.409074 Characterized in that the quick-holding device (10) further includes at least one operating unit (22), which includes an eccentric section (2202) such that an intermediate transmission element (2204) of the at least one loading mechanism (18) can be manipulated. The intermediate transmission element (2204) can be supported in the output shaft (14) to be translatable along the axial direction and is configured to drive the upper push rod portion (1804) to displace downward in response to the pressing of the eccentric section (2202).

10. The quick-holding device (10) for an electric tool (1) according to claim 1, characterized in that, The lower push rod portion (20) is configured such that its upper end is integrally integrated with the lower end of the upper push rod portion (1804), or the lower push rod portion (20) is configured to be separately manufactured from the upper push rod portion such that the lower push rod portion can be configured as a separate component from the upper push rod portion.

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