JP5657126B2 - Hand-held machine tool clamping device - Google Patents

Description

  The hand-held machine tool clamping device already known from DE 3824040 discloses a mounting unit for fixing a tool in the axial direction with respect to a spindle and a disconnection for disconnecting the mounting element of the mounting unit in the axial direction. Unit.

DISCLOSURE OF THE INVENTION The invention comprises at least one attachment unit for fixing a tool in the axial direction with respect to a spindle and at least one connection release unit for axially releasing at least one attachment element of the attachment unit. In particular, the starting point is a hand-held machine tool clamping device used in an angle grinder.

  It is proposed that the hand-held machine tool clamping device includes a drop-off prevention unit. The anti-falling unit at least partly causes a first relative movement between at least two mounting elements of the mounting unit to prevent the mounting unit and / or tools from falling off the spindle during braking operation. It is provided to convert to relative motion. In this context, the concept of “provided” should be understood in particular as “specially equipped” and / or “specially designed”. “Mounting unit” means here in particular a tool that is fixed to the spindle and / or another component by means of a shape connection (shape-based connection) and / or a friction force connection (friction force-based connection). It is understood that the unit is provided in particular so that it can be clamped against the housing flange of a hand-held machine tool and thereby transmit force and / or torque from the spindle to the tool in the assembled state of the tool It is desirable. Advantageously, the mounting unit has at least one first mounting element. The first mounting element is applied to the tool and is movable relative to the second mounting element by screwing the second mounting element of the mounting unit onto the spindle. Particularly advantageously, the second mounting element has a thread which engages with the thread of the spindle, so that the mounting unit can be threaded onto the spindle in order to fix and / or tighten the tool. .

  The term “axial” is to be understood in particular as a direction extending at least approximately parallel to the central axis of the mounting unit. In this case, the mounting unit is particularly preferably formed rotationally symmetrically with respect to the central axis. Furthermore, the central axis extends coaxially with respect to the rotation axis of the spindle, particularly when the mounting unit is assembled. Here, “substantially parallel” is understood to be the orientation of the direction relative to the reference direction, in particular in one plane, in which case this direction is in particular more than 8 ° with respect to the reference direction. It has a deviation which is small, preferably less than 5 °, particularly preferably less than 2 °. Here, the “disengagement unit” means that the axial clamping force acting on the tool from the mounting unit in the assembled state is at least 5%, preferably at least 50%, in particular for removing the mounting unit. It is understood that the unit is advantageously provided for at least a 90% reduction. Particularly advantageously, the first mounting element is moved relative to the second mounting element along the axial direction, in particular in a direction towards the second mounting element, by a disconnection by a disconnection unit. can do. The mounting unit is particularly preferably removably connected to the spindle. Here, “removable” can be understood as the release of the connection of the mounting unit from the spindle. In this case, the functionality of the mounting unit, in particular the function of converting the first relative movement between the first mounting element and the second mounting element into the second relative movement, is maintained in a disconnected state. It remains.

  The “drop-off prevention unit” can be understood as a unit provided in particular to prevent the tightening force of the axial mounting unit from disappearing during the braking operation. Here, “braking operation” is understood in particular as the operation of a spindle of a hand-held machine tool, in particular a hand-held machine tool, during which the spindle is braked by a braking device. In this way, for example, inertial rotation of the spindle when the power supply to the electric motor is interrupted can be advantageously prevented at least sufficiently. During the braking operation, relative movement occurs between the tool mounted on the spindle and the mounting unit, based on the inertial mass moment of the tool, in particular the disc-shaped tool. Relative movement between the tool and the mounting unit can lead to the mounting unit becoming loose and thus falling off the spindle. The drop-off prevention unit particularly preferably has a clamping force of at least 2%, preferably at least 20%, particularly preferably at least 50, based on the relative movement between the at least two transmission elements, during braking operation. % To increase. Particularly advantageously, the first mounting element moves relative to the second mounting element, in particular in the direction of the tool, in order to increase the clamping force in the axial direction. The hand-held machine tool clamping device according to the invention advantageously prevents loosening of the mounting unit from the spindle and thus the removal of the tool from the spindle.

  Furthermore, the dropout prevention unit has at least one return unit. This return unit is provided for automatically returning at least one of the two mounting elements to the basic position. Advantageously, the first mounting element and / or the second mounting element are automatically returned to the basic position by the return unit in the unloaded state. Here, “automatically” means automatic or automatic return of the operating element, in particular by the return unit, in particular directly and / or indirectly to the first and / or second mounting element by the operator. It is defined as a return released by a force action. Advantageously, a high working comfort of the hand-held machine tool clamping device can be achieved. Furthermore, it is ensured by the return unit that the first mounting element and / or the second mounting element can be reliably returned to the basic position, thereby ensuring the reliable function of the drop-off prevention unit. This is advantageous.

  The drop-off prevention unit is advantageously formed as a stroke unit. The stroke unit is provided for moving the attachment elements, in particular at least two attachment elements movable relative to each other, along an axial direction relative to each other based on a first relative movement. ing. Particularly advantageously, the first mounting element is moved axially relative to the second mounting element on the basis of the first relative movement. In this case, the first relative movement between the first attachment element and the second attachment element is a rotational movement. Here, a “stroke unit” is understood in particular as a unit comprising at least two components corresponding to each other, by which the movement of one element, in particular the first mounting element, is achieved. Can occur along a straight path. However, the fall-off prevention unit that forms the relative movement between the first mounting element and the second mounting element can also be formed in another form that would be advantageous to those skilled in the art, such as a cam transmission, for example. Conceivable. Aspects according to the invention can produce an axial stroke of the first mounting element relative to the second mounting element.

  Furthermore, it is proposed that the stroke unit has at least one stroke element, the stroke element being at least partly formed integrally with one of the two mounting elements. “Integral” is in particular connected and / or advantageous by at least a material connection, for example a welding process, an adhesive process, a fixing process by injection molding and / or another process that would be advantageous to the person skilled in the art. For example, it is understood that it is formed into one member by, for example, manufacturing from one casting and / or manufacturing by one-component injection molding method or multi-component injection molding method, and manufacturing from a single material. can do. This advantageously reduces the construction space, assembly effort and costs.

  Advantageously, the stroke element is shaped like a bevel. Here, the “slope shape” is understood to be a geometric shape having a mathematically defined inclination along a predetermined path extending from the start point to the end point. Thereby, there is a height difference between the start point and the end point, and / or the start point is arranged in a plane extending at least substantially parallel to the plane in which the end point is arranged. It is advantageous if the stroke unit has at least one second stroke element. The stroke element produces a second relative motion by cooperating with the first stroke element based on the first relative motion. In this case, the second stroke element is preferably formed in a sloped shape, so that rotation of the first mounting element relative to the second mounting element results in the sloped first stroke element. Can slide along the sloped second stroke element. However, it is also conceivable that the second stroke element is formed as a rolling element and rolls on the sloped first stroke element. The inclination of the first stroke element and / or the second stroke element is advantageously of the same magnitude as the inclination of the thread of the mounting unit and of the spindle to which the mounting unit can be screwed or unscrewed, Or it is formed larger than that. The inclination of the first stroke element and / or the second stroke element is in this case in particular between 100 and 150% of the inclination of the thread of the mounting unit and spindle, preferably 110 of the inclination of the thread of the mounting unit and spindle. ˜140%, particularly preferably 120 to 130% of the inclination of the mounting unit and spindle threads. In order to increase the friction in the thread of the mounting unit and the spindle relative to the friction between the two stroke elements, the means for increasing the friction in the thread of the mounting unit and the spindle, for example rubber elements, spring elements, It is also possible to introduce a coating or the like. Accordingly, the first relative motion can be converted into the second relative motion simply in terms of structure. In addition, the ramp-like travel element advantageously produces a high clamping force during braking, which acts on the tool for clamping.

  In addition, it is proposed that the stroke unit has at least one stroke element which is mounted so as to be movable relative to at least two mounting elements which are movable relative to one another. Thereby, in order to prevent the mounting unit and / or tool from falling off the spindle, the relative movement between the first mounting element and / or the second mounting element and the stroke element can be simplified structurally. Can be born.

  In an advantageous embodiment of the hand-held machine tool clamping device, the stroke element is arranged at least partly between the two mounting elements. Here, “between” defines a spatial arrangement in particular. Advantageously, the stroke element is arranged along the axial direction between the first mounting element and the second mounting element. In an alternative embodiment of the hand-held machine tool clamping device according to the invention, the stroke element is arranged between the first mounting element and the second mounting element in a direction perpendicular to the axial direction. . This advantageously makes it possible to achieve a compact hand-held machine tool clamping device.

  Advantageously, the travel element is at least partly guided in a ring track provided in at least two mounting elements which are movable relative to each other. A “ring trajectory” can be understood here as at least one trajectory extending in particular in the circumferential direction over 360 °. In this case, the track is formed in particular as a groove. Particularly preferably, the ring tracks extend in a threaded manner along the circumferential direction on the mutually facing sides of at least two mounting elements which are movable relative to one another. In this case, the threaded ring trajectory has a mathematically defined slope in the axial direction, so that the movement of the stroke element in the ring trajectory causes a stroke movement along the axial direction. Here, the circumferential direction is a direction extending in a plane extending in a direction substantially perpendicular to the axial direction. The inclination of the ring trajectory of the first mounting element and the inclination of the ring trajectory of the second mounting element corresponds in this case in particular to 100% to 150% of the inclination of the threading of the mounting element and the spindle, and preferably the mounting It corresponds to 110% to 140% of the inclination of the thread of the element and spindle, particularly preferably 120% to 130% of the inclination of the thread of the mounting element and spindle. The connection of the first mounting element and the second mounting element is preferably effected by a guide of the stroke element in the ring track provided in the first mounting element and in the ring track provided in the second mounting element. This can be achieved with a stroke element. As a result, the guide of the stroke element can be achieved simply structurally.

  It is advantageous if the stroke element is formed by at least one rolling element. The stroke element is particularly preferably formed by a plurality of rolling elements. These rolling elements are movably supported in the rolling element cage. This makes it possible to convert the first relative movement between the first mounting element and the second mounting element into a second relative movement, advantageously with little friction. Accordingly, a longer life of the hand-held machine tool clamping device can be achieved.

  Furthermore, it is proposed that the drop-off prevention unit and the connection release unit have at least one common stroke element. This makes it possible to achieve a particularly advantageously compact hand-held machine tool.

  Furthermore, the present invention relates to a hand-held machine tool equipped with a hand-held machine tool clamping device according to the present invention, in particular an angle grinder. Advantageously, a high working comfort can be achieved for the operator of the hand-held machine tool. Furthermore, it is possible to advantageously prevent the tool from falling off the spindle of the hand-held machine tool.

Other advantages will become apparent from the following description of the drawings. The drawings illustrate exemplary embodiments of the invention. The drawings, detailed description, and claims include numerous features in a combined form. Those skilled in the art can advantageously consider these features individually and group them into other advantageous combinations.

1 is a schematic view showing a hand-held machine tool according to the present invention provided with a hand-held machine tool clamping device according to the present invention; FIG. FIG. 2 is a schematic diagram showing details of the spindle of the machine tool shown in FIG. 1 with a hand-held machine tool clamping device according to the invention arranged on the spindle. It is the schematic which shows the detail of the hand-held machine tool clamping apparatus by this invention. FIG. 6 is a schematic diagram illustrating another detail of the hand-held machine tool clamping device according to the present invention. It is the schematic which shows the cross section along the VV line | wire shown in FIG. 4 of the handheld machine tool clamping apparatus by this invention. FIG. 2 is a schematic diagram illustrating details of an alternative aspect of a hand-held machine tool clamping device according to the present invention. FIG. 6 is a schematic diagram illustrating another detail of an alternative embodiment of a handheld machine tool clamping device according to the present invention. It is a figure which shows the cross section along the VIII-VIII line shown in FIG. 7 of the hand-held type machine tool by this invention. FIG. 6 is a schematic diagram illustrating details of yet another alternative aspect of a hand-held machine tool according to the present invention.

DESCRIPTION OF EXEMPLARY EMBODIMENTS FIG. 1 schematically shows a hand-held machine tool 46a formed as an angle grinding machine or angle grinder 44a with a hand-held machine tool clamping device 10a according to the invention. . The angle grinder 44a includes a protective hood unit 48a, a hand-held machine tool housing 50a, and a main hand grip 52a. The main hand grip 52a extends in the main extending direction 56a of the angle grinder 44a on the side of the hand-held machine tool housing 50a opposite to the tool 14a. In this case, the tool 14a is formed as a cutting disk. However, it is also conceivable that the tool 14a is formed as a grinding disc or a polishing disc. The hand-held machine tool housing 50a includes a motor housing 58a for housing an electric motor (not shown) and a transmission device housing 60a for housing a transmission device (not shown). An auxiliary hand grip 62a is disposed in the transmission device housing 60a. The auxiliary hand grip 62a extends in a lateral direction perpendicular to the main extending direction 56a of the angle grinder 44a.

  FIG. 2 shows a hand-held machine tool fastening device 10a disposed on the spindle 18a of the angle grinder 44a. The spindle 18a extends from the transmission housing 60a (not shown in FIG. 2) perpendicular to the main extending direction 56a. The spindle 18a has two flat processed portions 64a on the outer peripheral surface in order to accommodate the accommodating flange 70a. These flat processed parts 64a are arranged on the opposite side in diameter, and thus form a two-sided cut part 66a. In this case, only one of the two-sided cut portions 64a is shown in FIG. The housing flange 70a has a notch (not shown in detail) corresponding to the two-surface cut portion 66a. In this notch, the two-surface cut part 66a engages in the assembled state of the accommodation flange 70a. Therefore, the receiving flange 70a is coupled to the spindle 18a by the two-side cut portion 66a so as not to rotate. The housing flange 70a is arranged on the side of the spindle 18a facing the angle grinder 44a in the assembled state. The spindle 18a is driven to rotate about the rotation axis 68a of the spindle 18a by an electric motor of the transmission device and the angle grinder 44a. During the working operation of the angle grinder 44a, the spindle 18a is driven to rotate clockwise as viewed from the angle grinder 44a. In this case, the hand-held machine tool fastening device 10a is driven so as to rotate in the clockwise direction in the assembled state. The hand-held machine tool clamping device 10a has an attachment unit 12a for fixing the tool 14a to the spindle 18a in the axial direction 16a. The mounting unit 12a tightens the tool 14a toward the receiving flange 70a, which is connected to the spindle 18a in a shape-connecting manner, that is, based on shape constraints.

  During assembly of the tool 14a, the tool 14a is fitted over the spindle 18a along the axial direction 16a at its central opening until the tool 14a contacts the contact surface of the receiving flange 70a already attached to the spindle 18a. . Next, the hand-held machine tool clamping device 10a is screwed onto the male thread 72a of the spindle 18a using the mounting unit 12a. The mounting unit 12a has a first mounting element 22a, which has a contact surface 76a that contacts the side of the tool 14a opposite to the receiving flange 70a. . The abutment surface 76a of the first attachment element 22a and the surface of the tool 14a that contacts the abutment surface 76a have an adhesion coating layer (not shown in detail), so the first attachment element High friction can be achieved between the abutment surface 76a of 22a and the surface of the tool 14a that contacts the abutment surface 76a. However, it is also conceivable that the contact surface 76a and the surface of the tool 14a that contacts the contact surface 76a have corresponding sloped geometric shapes that engage with each other inside and outside. Other means and configurations that may be advantageous to those skilled in the art are also possible to increase friction between the abutment surface 76a and the surface of the tool 14a that contacts the abutment surface 76. Furthermore, the mounting unit 12a has a second mounting element 28a. The second mounting element 28a has a female thread 74a that is screwed with a male thread 72a provided on the spindle 18a. The tool 14a is tightened at the receiving flange 70a by screwing the mounting unit 12a onto the spindle 18a. By tightening the tool 14a with respect to the housing flange 70a, torque can be transmitted from the spindle 18a to the tool 14a. The tool 14a is driven to rotate in the clockwise direction when viewed from the angle grinder 44a during the operation of the angle grinder 44a. Maintaining the tightening force during the working operation of the angle grinder 44a depends on the cooperation of the external thread 72a of the spindle 18a and the internal thread 74a of the second mounting element 28a, and the contact surface 76a and the corresponding surface. Guaranteed by friction between the surface of the tool 14a in contact with 76a.

  In order to screw the second mounting element 28a onto the spindle 18a, the mounting unit 12a further includes an operating element 78a. The operating element 78a is formed in an annular shape (FIG. 3). Further, the operation element 78a has connection regions 80a and 82a formed in a web shape. In this case, these connection regions 80a and 82a extend in a direction toward the second mounting element 28a along a radial direction 114a extending in a direction perpendicular to the central axis 24a of the operation element 78a. Similarly, the second mounting element 28a has connection regions 84a and 86a for non-rotatable connection with the operation element 78a. The connection regions 84a and 86a of the second mounting element 28a extend in the direction toward the operating element 22a along the radial direction 114a. The number of connection areas 84a and 86a provided in the second attachment element 28a is related to the number of connection areas 80a and 82a provided in the operation element 78a. Overall, the operating element 78a has two connection areas 80a, 82a, and the mounting element 28a has two connection areas 84a, 86a as well. However, it is also conceivable that the operating element 78a and the mounting element 28a each have a different number of connecting regions 80a, 82a, 84a, 86a that would be advantageous to those skilled in the art (FIG. 4).

  Furthermore, the hand-held machine tool clamping device 10a has a connection release unit 20a for releasing the connection of the first attachment element 22a of the attachment unit 12a in the axial direction 16a. Since the tightening force of the attachment unit 12a can be reduced by using the connection release unit 20a, the attachment unit 12a can be detached from the spindle 18a by an operator without using a tool. The second mounting element 28a is disposed within the annular operating element 78a (FIGS. 4 and 6). In order to couple the operating element 78a and the second mounting element 28a, the operating element 78a and the second mounting element 28a have one groove 120a, 122a, respectively. An O-shaped ring 124a of the mounting unit 12a is disposed in these grooves 120a and 122a. The operating element 78a surrounds the second mounting element 28a along the circumferential direction 88a. The first mounting element 22a is formed in a substantially disk shape and is likewise arranged in the operating element 78a. For coupling between the operating element 78a and the first mounting element 22a, the operating element 78a and the first mounting element 22a have one groove 128a and 130a, respectively. An O-shaped ring 126a of the mounting unit 12a is disposed in the grooves 128a and 130a. The first mounting element 22a has a sloped stroke element 34a (FIG. 5). The stroke element 34a is formed integrally with the first mounting element 22a. Overall, the first attachment element 22a has two stroke elements 34a formed integrally with the first attachment element 22a. In this case, only one of the two stroke elements 34a is shown in FIG. The stroke elements 34a are arranged so as to be shifted from each other by about 180 ° along the circumferential direction 88a. The second attachment element 28a also has two stroke elements 90a formed integrally with the second attachment element 28a. The stroke elements 90a of the second mounting element 28a are arranged offset by about 180 ° relative to each other along the circumferential direction 88a. Only one of the two stroke elements 90a of the second mounting element 28a is shown in the drawing. The travel element 34a of the first mounting element 22a has a slope in the opposite direction to the travel element 90a of the second mounting element 28a (FIG. 5).

  The disconnect unit 20a further includes two stroke elements 36a and 92a. These stroke elements 36a, 92a connect the first mounting element 22a and the second mounting element 28a to each other so as to interact with each other. The stroke elements 36a and 92a of the connection release unit 20a are formed in a slope shape. Furthermore, the stroke elements 36a, 92a of the decoupling unit 20a are arranged between the first mounting element 22a and the second mounting element 28a of the mounting unit 12a. In this case, the stroke elements 36a, 92a of the decoupling unit 20a are inclined in the direction opposite to the stroke element 34a of the first mounting element 22a on the side facing the stroke element 34a provided on the first mounting element 22a. have. Further, the stroke elements 36a and 92a of the disconnection unit 20a are inclined in the opposite direction to the stroke element 90 of the second mounting element 28a on the side facing the stroke element 90a provided on the second mounting element 28a. (FIG. 5). The stroke elements 36a, 92a of the decoupling element 20a are supported in the mounting unit 12a so as to be movable relative to the first mounting element 22a and relative to the second mounting element 28a. ing. In this case, the stroke elements 36a, 92a of the decoupling unit 20a are in contact with the stroke element 34a of the first mounting element 22a and the stroke element 90a of the second mounting element 28a. Further, the connection release unit 20a includes lock elements 94a and 96a. These locking elements 94a and 96a prevent the movement elements 36a and 92a of the disconnection unit 20a from moving in the circumferential direction 88a. The lock elements 94a and 96a are formed as cylindrical rollers. However, it is also conceivable that the locking elements 94a, 96a are formed in other shapes that would be advantageous to those skilled in the art.

  Furthermore, the connection release unit 20a has four spring elements 98a, 100a, 102a, 104a. These spring elements 98a, 100a, 102a, 104a are provided to preload the first mounting element 22a and the second mounting element 28a with respect to each other in the circumferential direction 88a. Two spring elements of these spring elements 98a, 100a, 102a, 104a are respectively connected to one of the two connection regions 80a, 82a of the operating element 78a and the first mounting element 22a along the circumferential direction 88a. Between the two web-like connecting regions 106a and 108a. Further, the other two spring elements of the spring elements 98a, 100a, 102a, 104a are provided on one of the connection regions 106a, 108a provided on the first attachment element 22a and on the second attachment element 28a. Furthermore, it is arranged along the circumferential direction 88a between one of the two connecting regions 84a and 86a (FIG. 4). The spring elements 98a, 100a, 102a, 104a are formed as compression springs. However, it is also conceivable that the spring elements 98a, 100a, 102a, 104a are formed in other forms that would be advantageous to those skilled in the art.

  The force applied to the operating element 78a by the operator when the mounting unit 12a is screwed is transmitted to the limiting elements 162a and 164a of the second mounting element 28a by the connection regions 80a and 82a of the operating element 78a. Therefore, the mounting unit 12a is screwed to the spindle 18a by the cooperation of the female thread 74a provided on the second mounting element 28a and the male thread 72a provided on the spindle 18a. A force is also applied to the operating element 78a by the operator when the mounting unit 12a is removed from the spindle 18a and / or unscrewed (or unscrewed). However, this force has a direction opposite to the force applied at the time of screwing. When operating the operating element 78a for removing and / or unscrewing the mounting unit 12a, the operating element 78a is first relative to the first mounting element 22a and relative to the second mounting element 28a. Rotated. In this case, the connecting regions 80a and 82a of the operating element 78a move away from the restricting elements 162a and 164a of the second mounting element 28a along the circumferential direction 88a. The spring elements 98a, 100a, 102a, 104a are compressed in this case. The operation element 78a further includes two connection release notches 110a and 112a. The disconnection cutouts 110a and 112a are arranged so as to be shifted from each other by about 180 ° along the circumferential direction. Other numbers of disconnect notches 110a, 112a that may be meaningful to those skilled in the art are similarly contemplated. As the operation element 78a is rotated, the connection release notches 110a and 112a are rotated to the connection release position, so that the lock elements 94a and 96a free the movement possibility of the stroke elements 36a and 92a of the connection release unit 20a. Therefore, it is possible to escape into the connection release notches 110a and 112a along the radial direction 114a.

  As a result of the movement of the locking elements 94a, 96a, the stroke elements 36a, 92a of the decoupling unit 20a can move along the circumferential direction 88a. In this case, the stroke elements 36a, 92a of the decoupling unit 20a slide on the stroke element 34a of the first mounting element 22a and the stroke element 90a of the second mounting element 28a. The first mounting element 22a moves toward the second mounting element 28a relative to the second mounting element 28a along the axial direction 16a as a result of the sliding of the stroke elements 36a, 92a of the disconnection unit 20a. Move in the direction. This reduces the clamping force between the female thread 74a of the second mounting element 28a and the male thread 72a of the spindle 18a. This allows the operator to unscrew the mounting unit 12a from the spindle 18a without using a tool.

  Further, the angle grinder 44a has a braking device (not shown) that prevents inertial rotation of the spindle 18a during the switch-off process of the angle grinder 44a due to interruption of power supply. During the switch-off process, the angle grinder 44a is switched to a braking operation and brakes the spindle 18a using a braking device. During the braking operation, the tool 14a continues to move around the rotation axis 68a of the spindle 18a based on mass inertia, so that a torque difference is generated between the tool 14a, the spindle 18a, and the mounting unit 12a. This torque difference results in relative movement between the tool 14a and the mounting unit 12a. Based on the friction between the mounting unit 12a and the inertial tool 14a, the tightening force may be eliminated. As a result, the mounting unit 12a is loosened from the spindle 18a, and the mounting unit 12a may fall off the spindle together with the tool 14a.

  In order to prevent the attachment unit 12a and / or the tool 14a from falling off during the braking operation, the handheld machine tool clamping device 10a has a dropout prevention unit 26a. The drop-off prevention device 26a is provided so as to at least partially convert the first relative motion between the first mounting element 22a and the second mounting element 28a of the mounting unit 12a into a second relative motion. It has been. In this case, the first relative movement between the first mounting element 22a and the second mounting element 28a is a rotation about the rotation axis 68a. The second relative movement between the first mounting element 22a and the second mounting element 28a is a translational movement along the axial direction 16a. The rotation between the first mounting element 22a and the second mounting element 28a results from a torque difference between the tool 14a and the mounting unit 12a during the braking operation. The tool 14a rotates the first mounting element 22a together by the friction generated between the tool 14a and the contact surface 76a of the first mounting element 22a.

  The dropout prevention unit 26a has a return unit 30a. The return unit 30a is provided to automatically return the first mounting element 22a and the second mounting element 28a to the basic position. In this case, the return unit 30a includes the spring elements 98a, 100a, 102a, 104a of the connection release unit 20a for the return. The spring elements 98a, 100a, 102a, 104a connect the first mounting element 22a, the second mounting element 28a, and the operating element 78a to each other with the mounting unit 12a substantially unloaded. On the other hand, it is rotated along the circumferential direction 88a. As a result, the lock elements 94a and 96a of the connection release unit 20a move out of the connection release notches 110a and 112a. In this case, the lock elements 94a and 96a apply a force to the stroke elements 36a and 92a of the disconnection unit 20a. Thus, the stroke elements 36a, 92a of the decoupling unit 20a are moved between the stroke element 34a of the first mounting element 22a and the stroke element 90a of the second mounting element 28a. Movement of the stroke elements 36a, 92a of the decoupling unit 20a in the direction toward the locking elements 94a, 96a causes the locking elements 94a, 96a of the decoupling unit 20a and the limiting elements 162a, 164a of the second mounting element 28a to move. Has been blocked by the collaboration. The connection notches 110a and 112a have one inclined surfaces 116a and 118a, respectively. These inclined surfaces 116a and 118a are provided to cause force components in the direction toward the stroke elements 36a and 92a of the connection release unit 20a to act on the lock elements 94a and 96a as a result of the rotational movement of the operation element 78a.

  The dropout prevention unit 26a is formed as a stroke unit 32a. The stroke unit 32a is provided for moving the first mounting element 22a along the axial direction 16a as a result of a first relative movement relative to the second mounting element 28a. The stroke unit 32a includes a stroke element 34a. The stroke element 34a is formed integrally with the first mounting element 22a. Further, the stroke unit 32a includes a stroke element 90a. The stroke element 90a is formed integrally with the second mounting element 28a. Further, the stroke unit 32a includes stroke elements 36a and 92a of the disconnection unit 20a. These stroke elements 36a, 92a are supported so as to be movable relative to the first mounting element 22a and relative to the second mounting element 28a. Accordingly, the dropout prevention unit 26a and the connection release unit 20a have two common stroke elements 36a and 92a.

  During the braking operation of the angle grinder 44a, the first mounting element 22a moves relative to the second mounting element 28a based on the friction and torque differences between the tool 14a and the first mounting element 22a. It is rotated along the circumferential direction 88a. In this case, the first mounting element 22a is a spring of the spring elements 98a, 102a arranged between the connection regions 106a, 108a of the first mounting element 22a and the connection regions 84a, 86a of the second mounting element 28a. Be exercised against power. In this case, the locking elements 94a, 96a block the movement of the stroke elements 36a, 92a of the stroke unit 32a, so that the stroke element 34a of the first mounting element 22a slides in the stroke elements 36a, 92a of the stroke unit 32a. be able to. The first mounting element 22a moves in the direction toward the tool 14a along the axial direction 16a relative to the second mounting element 28a based on the inclination of the stroke element 34a of the first mounting element 22a. Be made. The clamping force acting on the tool 14a may be maintained or increased, thereby preventing the attachment unit and / or tool 14a from falling off the spindle 18a. In order to remove and / or unscrew the mounting unit 12a, the operating element 78a is operated by the operator. This reduces the clamping force, as already described above, so that the operator can easily remove the mounting unit.

Furthermore, the hand-held machine tool clamping device 10a includes an anti-friction element. The anti-friction element is arranged in the mounting unit 12a. As a result, the frictional force occupying the inside can be kept small. Antifriction elements, as in this case, may have been introduced into the mounting element 12a in the form of liquid or antifriction elements, is, for example, coatings such as Teflon, of the mounting unit 12a, relative to each other It is attached to the component member supported so that movement is possible.

  6 to 9 show two alternative embodiments. Substantially identical components, features and functions are given essentially the same reference numerals. In order to distinguish the embodiments, alphabets from a to c are given to the reference numerals of the examples. The following description is mainly limited to the differences with respect to the first embodiment shown in FIGS. In this case, the description of the first embodiment shown in FIGS. 1 to 5 can be referred to for the similar components, features, and functions.

  FIG. 6 shows an alternative hand-held machine tool clamping device 10b. This hand-held machine tool clamping device 10b has a mounting unit 12b for fixing the tool 14b in the axial direction 16b with respect to a spindle 18b of a hand-held machine tool 46b formed as an angle grinder 44b. The angle grinder 44b has a structure similar to the angle grinder 44a shown in FIG. Furthermore, the hand-held machine tool clamping device 10b has a connection release unit 20b for releasing the connection of the first attachment element 22b of the attachment unit 12b in the axial direction 16b (FIG. 7). The disconnection unit 20b has three stroke elements 132b, 134b, and 136b (FIG. 8). These three stroke elements 132b, 134b, 136b are movably supported along the radial direction 114b. Further, the connection release unit 20b has three lock elements 94b, 96b, and 138b. These locking elements 94b, 96b, 138b are provided to substantially prevent movement of the three stroke elements 132b, 134b, 136b in the radial direction 114b in at least one operating position. Due to the rotation of the operating element 78b of the mounting unit 12b about the central axis 24b of the mounting unit 12b, in the radial direction 114b into one of the three disconnecting notches 110b, 112b, 140b. Movement of the three locking elements 94b, 96b, 138b along is possible. When the three lock elements 94b, 96b, 138b are respectively located in one of the three connection release notches 110b, 112b, 140b, the stroke elements 132b, 134b, 136b can perform movement toward radial direction 114b. The first attachment element 22b can move relative to the second attachment element 28b after movement in the radial direction 114b of the stroke elements 132b, 134b, 136b of the decoupling unit 20b. Due to the movement of the stroke elements 132b, 134b, 136b of the decoupling unit 20b in the radial direction 114b and the movement of the first mounting element 22b along the axial direction 16b, the female thread 74b of the second mounting element 28b The clamping force with the male thread 72b of the spindle 18b is reduced. Therefore, the operator can remove the attachment unit 12b from the spindle 18b without using a tool.

  Furthermore, the hand-held machine tool fastening device 10b has a drop-off prevention unit 26b. The drop-off prevention unit 26b includes a first attachment element 22b and a second attachment element 28b of the attachment unit 12b to prevent the attachment unit 12b and / or the tool 14b from falling off the spindle 18b during the braking operation. The first relative motion between is at least partly converted to a second relative motion. The fall prevention unit 26b includes a return unit 30b provided to automatically return the first mounting element 22b to the basic position. In this case, the return unit 30b has a spring element 142b. The spring element 142b is formed as a wire spring. One end of the spring element 142b is coupled to the first mounting element 22b. The end of the spring element 142b located on the opposite side of the end connected to the first mounting element 22b is connected to the support element 144b of the drop-off prevention unit 26b. This causes the spring element 142b to return the first mounting element 22b relative to the support element 144b.

  The dropout prevention unit 26b is formed as a stroke unit 32b. The stroke unit 32b is provided to move the first attachment element 22b along the axial direction 16b relative to the second attachment element 28b based on the first relative movement. The stroke unit 32b has four stroke elements 34b and 90b (only two are shown in FIG. 7). These stroke elements 34b and 90b are formed integrally with the first mounting element 22b. Further, the stroke unit 32b has four other stroke elements 36b, 92b, 158b, 160b. These stroke elements 36b, 92b, 158b, 160b are formed integrally with the support element 144b. The support element 144b is formed between the first attachment element 22b and the second attachment element 28b along the axial direction 16b. Further, the support element 144b is supported so as to be movable relative to the first attachment element 22b and relative to the second attachment element 28b. Accordingly, the other stroke elements 36b, 92b, 158b, 160b of the support element 144b are supported so as to be movable relative to the first mounting element 22b and relative to the second mounting element 28b. ing. The stroke elements 34b and 90b provided on the first mounting element 22b and the stroke elements 36b, 92b, 158b and 160b provided on the support element 144b are each formed in a slope shape. In this case, the stroke elements 34b, 90b of the first mounting element 22b have an inclination in the opposite direction to the stroke elements 36b, 92b, 158b, 160b of the support element 144b. The support element 144b is coupled to the second mounting element 28b by a lubrication element 156b. This ensures a relative movement of the first mounting element 22b relative to the support element 144b during braking operation.

  FIG. 9 shows yet another alternative handheld machine tool clamping device 10c. This hand-held machine tool clamping device 10c includes an attachment unit 12c for fixing the tool 14c in the axial direction 16c with respect to the spindle 18c, and a connection release unit for releasing the connection of the first attachment element 22c of the attachment unit 12c in the axial direction 16c. 20c. Since the connection release unit 20c has a configuration similar to that of the connection release unit 20b, refer to the description of FIGS. 6 to 8 for the functional form of the mounting unit 20c.

  The hand-held machine tool clamping device 10c further includes a dropout prevention unit 26c. The drop-off prevention unit 26c is provided with a first attachment element 22c and a second attachment element 28c of the attachment unit 12c to prevent the attachment unit 12c and / or the tool 14c from falling off the spindle 18c during the braking operation. The first relative motion between is at least partially converted into a second relative motion. The dropout prevention unit 26c has a return unit 30c. The return unit 30c is provided so as to automatically return the first mounting element 22c to the basic position. Further, the dropout prevention unit 26c is formed as a stroke unit 32c. The stroke unit 32c is provided to move the first mounting element 22c along the axial direction 16c relative to the second mounting element 26c based on the first relative movement. In this case, the stroke unit 32c has a stroke element 36c. The stroke element 36c is supported so as to be movable relative to the first attachment element 22c and relative to the second attachment element 28c. In this case, the stroke element 36c is guided in the ring track 38c of the first mounting element 22c and the ring track 40c of the second mounting element 28c. Further, the stroke element 36c is formed as a rolling element 42c. The rolling element 42c includes a cage 146c and a plurality of balls 148c, 150c, 152c, 154c supported in the cage 46. The rolling element 42 is disposed between the first mounting element 22c and the second mounting element 28c along a radial direction 114c extending in a direction perpendicular to the axial direction 16c.

Claims (9)

At least one mounting unit (12a; 12b; 12c) for fixing the tool (14a; 14b; 14c) to the spindle (18a; 18b; 18c) in the axial direction (16a; 16b; 16c);
At least one decoupling unit (20a; 20b; 20c) for decoupling at least one mounting element (22a; 22b; 22c) of said mounting unit (12a; 12b; 12c) in the axial direction (16a; 16b; 16c) With
A hand-held machine tool clamping device,
In order to prevent the mounting unit (12a; 12b; 12c) and / or the tool (14a; 14b; 14c) from falling off the spindle (18a; 18b; 18c) during braking operation, the mounting unit ( 12a; 12b; 12c) so as to at least partially convert the first relative movement between at least two mounting elements (22a, 28a; 22b, 28b; 22c, 28c) into a second relative movement. A drop-off prevention unit (26a; 26b; 26c) provided in
The drop-off prevention unit (26a; 26b; 26c) moves the mounting element (22a, 28a; 22b, 28b; 22c, 28c) relative to each other based on the first relative movement in the axial direction (16a 16b; 16c) as a travel unit (32a; 32b; 32c) provided for movement along
The stroke unit (32a; 32b; 32c) is supported so as to be movable relative to the at least two mounting elements (22a, 28a; 22b, 28b; 22c, 28c) which are movable relative to each other. Comprising at least one stroke element (36a, 92a; 36b, 92b, 158b, 160b; 36c);
The stroke element (36b, 92b, 158b, 160b ; 36c) is at least in part on the mounting element (22b, 28b; 22c, 28c ) characterized that you have placed between the hand-held machine tool clamping apparatus.   The drop-off prevention unit (26a; 26b; 26c) is provided to automatically return at least one of the two attachment elements (22a, 28a; 22b, 28b; 22c, 28c) to the basic position. The hand-held machine tool clamping device according to claim 1, comprising at least one return unit (30a; 30b; 30c). The stroke unit (32a; 32b) has at least one stroke element (34a, 90a; 34b, 90b) formed at least partially integral with one of the mounting elements (22a, 28a; 22b, 28b). The hand-held machine tool clamping device according to claim 1 or 2, wherein: The hand-held machine tool fastening device according to claim 3 , wherein the stroke elements (34a, 90a; 34b, 90b) are formed in a slope shape. The travel element (36c) is at least partially guided in a ring track (38c, 40c) provided in the at least two mounting elements (22c, 28c) which are movable relative to each other. The hand-held machine tool fastening device according to any one of claims 1 to 4 . The hand-held machine tool clamping device according to claim 5 , wherein the stroke element (36c) is formed by at least one rolling element (42c). The hand-held work according to any one of claims 1 to 4 , wherein the drop-off prevention unit (26a) and the disconnection unit (20a) have at least one common stroke element (36a, 92a). Mechanical clamping device. A hand-held machine tool comprising the hand-held machine tool fastening device according to any one of claims 1 to 7 . The hand-held machine tool according to claim 8, which is an angle grinder.

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