DE102022124134A1 - Quick-change adapter for attaching a hole saw to a machine tool - Google Patents

Abstract

The invention relates to a quick-change adapter for attaching a hole saw (2) to a machine tool, with a receiving shaft (3) for connection to a machine tool for executing rotational movements about a quick-change adapter axis (A), with a coupling device (4) for axially fixed and in particular rotationally fixed connection of the Quick-change adapter (1) with a hole saw (2), the coupling device (4) being designed to form an axially fixed connection with a radial internal thread (6) of a recess in the hole saw (2), the coupling device (4) having a first coupling element ( 7) with a first coupling section (9) and a second coupling element (8) with a second coupling section (10) for connection to the radial internal thread (6) of the hole saw (2). It is proposed that the first coupling section (9) has a first radial outer surface (11) with an external thread (12), that the second coupling section (10) is designed to be threadless, that the external thread (12) of the first coupling section (9) is in in a state connected to the hole saw (2) in meshing engagement with the internal thread (6) of the hole saw (2) and that the second coupling section (10) in a state connected to the hole saw (2) at least partially against the internal thread (6) the hole saw (2).

Description

The present invention relates to a quick-change adapter for attaching a hole saw to a machine tool according to the preamble of claim 1 and a hole saw arrangement with a hole saw according to claim 14 and a method for establishing and / or releasing a connection between a hole saw and a quick-change adapter according to one of claims 1 to 13 according to the preamble of claim 15.

The well-known quick-change adapter ( EP 3 429 789 A1 ), from which the invention is based, discloses a quick-change adapter for attaching a hole saw to a machine tool. The quick-change adapter has a receiving shaft for connection to a machine tool for transmitting a torque from the machine tool to the hole saw attached to the quick-change adapter. The quick-change adapter has a coupling device for connection to the hole saw with a first coupling element and a second coupling element. The first coupling element has a first coupling section with a radial external thread and the second coupling element has a second coupling section with a radial external thread. In order to establish a connection between the quick-change adapter and the hole saw, the two external threads of the first and second coupling sections can be brought into axially fixed engagement with an internal thread of the hole saw.

It is a challenge to align the two external threads of the first and second coupling sections in the axial direction so precisely that a uniform engagement in the circumferential direction into the internal thread of the hole saw is possible. A slight axial displacement and/or a slight tilting of one coupling section relative to the other coupling section can result in the external thread of one coupling section engaging with the internal thread of the hole saw, while the flanks of the external thread of the other coupling section at least partially against flanks of the internal thread of the hole saw which can result in an uneven connection between the quick-change adapter and the hole saw.

The invention is based on the problem of designing and developing the known quick-change adapter in such a way that particularly rapid coupling and uncoupling between the quick-change adapter and the hole saw is made possible with a particularly cost-effective design of the quick-change adapter.

The above problem is solved by the features of the characterizing part of claim 1.

The fundamental consideration is to provide the first coupling section with an external thread and to design the second coupling section without threads. When the quick-change adapter is connected to the hole saw, the external thread is in meshing engagement with the internal thread of the hole saw. At the same time, the second coupling section rests at least in sections against the internal thread of the hole saw, whereby an axially fixed engagement between the quick-change adapter and the hole saw is achieved. The axial alignment between the first coupling section and the second coupling section then has to be less precise, which means that further cost savings can be achieved in addition to the formation of only one external thread. As will be explained below, particularly quick coupling and uncoupling between the quick-change adapter and the hole saw can be achieved in this way.

In detail, it is proposed that the first coupling section has a first radial outer surface with an external thread, that the second coupling section is designed to be threadless, that the external thread of the first coupling section is in meshing engagement with the internal thread of the hole saw in a state connected to the hole saw and that the second coupling section in a state connected to the hole saw rests at least in sections against the internal thread of the hole saw.

Claims 2 and 3 relate to preferred structural configurations of the first and second coupling sections.

Claim 4 relates to preferred geometric configurations of the external thread of the first coupling section, the second outer surface of the second coupling section and the internal thread of the hole saw.

According to the further embodiment according to claim 5, the first radial outer surface and thus the external thread has a smaller extent in the circumferential direction than the second outer surface, whereby a particularly easy detachability between the internal thread of the hole saw and the external thread of the first coupling section can be achieved.

Claim 6 defines preferred angles which the first radial outer surface forms in the circumferential direction, thereby making and / or releasing a connection between the quick-change Seladapter and the hole saw can be done in a particularly simple manner.

According to the particularly preferred embodiment according to claim 7, the two coupling elements can be displaced relative to one another in the axial direction in order to establish and/or release a connection between the hole saw and the coupling device. Thus, by displacing the two coupling elements relative to one another in the axial direction, a connection between the hole saw and the coupling device can be established and/or released. Such a relative movement is particularly easy to carry out and can also be carried out automatically. The relative movement is also independent of centrifugal forces that arise due to rotation around the quick-change adapter axis.

According to claim 8, the first coupling element and the second coupling element can be displaced relative to one another in the axial direction at least by the amount of the thread pitch of the external thread of the first coupling section. It is particularly advantageous if the two coupling elements can be displaced relative to one another in the axial direction at least around the axial extent of the external thread of the first coupling section.

According to the further embodiment according to claim 9, the receiving shaft is connected to the second coupling element in a rotationally fixed manner. In addition, the receiving shaft is connected to the first coupling element in a rotationally fixed and axially fixed manner. The coupling device also has at least one connecting element which is coupled in a rotationally fixed manner to the receiving shaft. The connecting element can be brought into non-rotatable engagement with a complementary connecting recess of the hole saw assigned to the connecting element, which enables torque transmission from the quick-change adapter to the hole saw about the quick-change adapter axis in a particularly simple manner.

According to the preferred embodiment according to claim 10, the second coupling element and the at least one connecting element are connected in an axially fixed and rotationally fixed manner to a handle component of the coupling device. The handle component is adjustable in the axial direction relative to the receiving shaft and is coupled to it in a rotationally fixed manner. By a simple axial movement of the handle component relative to the receiving shaft, the second coupling element and the at least one connecting element can be adjusted relative to the receiving shaft, thereby making it possible to establish and/or release a connection between the quick-change adapter and the hole saw in a particularly simple manner.

According to the further preferred embodiment according to claim 11, the handle component for releasing the connection between the quick-change adapter and the hole saw is adjustable from a coupling position to a decoupling position in a first axial direction. Furthermore, the handle component for establishing the connection between the quick-change adapter and the hole saw can be adjusted from the decoupling position to the engagement position in a second axial direction. In this way, the connection can be made and released in a particularly simple manner.

Claim 12 relates to a preferred structural design of the receiving shaft and the handle component in order to limit the axial movement between the handle component and the receiving shaft in a particularly advantageous manner.

According to the embodiment according to claim 13, in order to release the connection between the quick-change adapter and the hole saw, the quick-change adapter can be displaced in the radial direction when the handle component is transferred to the uncoupling position in order to bring the external thread of the first coupling section out of engagement with the internal thread of the hole saw, whereby the quick-change adapter can be separated from the hole saw in the axial direction. Alternatively or additionally, in order to establish a connection between the quick-change adapter and the hole saw, the quick-change adapter, when the engagement component is transferred to its uncoupling position, can be displaced relative to the hole saw in the axial and radial directions in order to engage the external thread of the first coupling section with the internal thread of the hole saw bring, whereby the handle component can be brought into its engagement state.

According to a further teaching according to claim 14, which has independent meaning, a hole saw arrangement with a hole saw and a quick-change adapter according to one of the preceding claims is claimed.

Reference may be made to all statements regarding the proposed quick-change adapter.

According to a further teaching according to claim 15, which also has independent meaning, a method for establishing and / or releasing a connection between a hole saw and a quick-change adapter according to one of claims 1 to 14 is claimed.

It is essential that in order to establish and/or release a connection between the quick-change adapter and the hole saw, the second coupling element is adjusted, in particular displaced, relative to the first coupling element in the axial direction.

Reference may be made to all statements regarding the proposed quick-change adapter and the proposed hole saw arrangement.

• 1 einen vorschlagsgemäßen Schnellwechseladapter a) in einer perspektivischen Ansicht mit einer an den Schnellwechseladapter angekoppelten Lochsäge und b) in einer perspektivischen Ansicht mit einer vom Schnellwechseladapter entkoppelten Lochsäge,
• 2 den mit der Lochsäge gekoppelten Schnellwechseladapter aus 1a) in einem Längsschnitt und einem Querschnitt,
• 3 3 einen Entkopplungsvorgang zwischen dem Schnellwechseladapter und der Lochsäge a) zu Beginn des Entkopplungsvorgangs, wobei der Schnellwechseladapter mit der Lochsäge gekoppelt ist, in einem Längsschnitt und einem Querschnitt und b) nach einer axialen Verschiebung des zweiten Kupplungselements relativ zum ersten Kupplungselement, wobei das zweite Kupplungselement aus dem Innengewinde der Lochsäge herausgeführt ist, in einem Längsschnitt und einem Querschnitt und
• 4 in einem Längsschnitt und einem Querschnitt in a) den weiteren Entkopplungsvorgang aus 3 zwischen dem Schnellwechseladapter und der Lochsäge nach einer radialen Bewegung zwischen dem Schnellwechseladapter und der Lochsäge, in b) den Schnellwechseladapter nach dem axialen Herausführen des ersten Kupplungselements aus dem Innengewinde der Lochsäge und in c) einen Längsschnitt und einen Querschnitt der Lochsäge im vom Schnellwechseladapter entkoppelten Zustand.

The invention is explained in more detail below using a drawing that only shows exemplary embodiments. Shown in the drawing

• 1 a proposed quick-change adapter a) in a perspective view with a hole saw coupled to the quick-change adapter and b) in a perspective view with a hole saw decoupled from the quick-change adapter,
• 2 the quick-change adapter coupled to the hole saw 1a) in a longitudinal section and a cross section,
• 3 3 a decoupling process between the quick-change adapter and the hole saw a) at the beginning of the decoupling process, wherein the quick-change adapter is coupled to the hole saw, in a longitudinal section and a cross section and b) after an axial displacement of the second coupling element relative to the first coupling element, wherein the second coupling element is led out of the internal thread of the hole saw, in a longitudinal cut and a cross section and
• 4 in a longitudinal section and a cross section in a) the further decoupling process 3 between the quick-change adapter and the hole saw after a radial movement between the quick-change adapter and the hole saw, in b) the quick-change adapter after the first coupling element has been axially guided out of the internal thread of the hole saw and in c) a longitudinal section and a cross section of the hole saw in the state decoupled from the quick-change adapter .

The proposed quick-change adapter 1 is in 1a) in a state coupled to a hole saw 2 and in 1b) shown in a state decoupled from the hole saw 2. The term “hole saw” in this case is understood to mean a tool used in conjunction with machine tools with which circular holes of limited depth and/or continuous core hole drilling can be sawn into various materials, such as drill bits, can drills, core hole drills or the like.

The quick-change adapter 1 has a receiving shaft 3 for connection to a machine tool. The term “machine tool” in this case refers to both stationary machines for producing workpieces with tools and, in particular, driven, hand-held machines. If the quick-change adapter 1 is connected to a machine tool via the receiving shaft 3, a torque can be transmitted from the machine tool to the hole saw 2 via the quick-change adapter 1. The quick-change adapter 1 is rotated about a geometric quick-change adapter axis A.

The quick-change adapter 1 has a coupling device 4, via which the quick-change adapter 1 can be connected to the hole saw 2 in an axially fixed and in particular rotationally fixed manner. The hole saw 2 has a geometric hole saw axis B, which, when connected to the quick-change adapter 1, is arranged coaxially to the quick-change adapter axis A. Unless otherwise stated, the term “axial” in this case always refers to the quick-change adapter axis A. The same applies to the terms “axially fixed” and/or “radial”.

For connection to the quick-change adapter 1, the hole saw 2 has a bore 5, in particular a through bore, with a radial internal thread 6. The coupling device 4 has a first coupling element 7 and a second coupling element 8. The first coupling element 7 has a first coupling section 9 and the second coupling element 8 has a second coupling section 10, which, when coupled to the hole saw 2, produce an axially fixed connection with the internal thread 6 of the hole saw 2, as in 2 is shown. How 2 further shows, the first coupling section 9 and the second coupling section 10 are arranged next to one another at least in sections in the circumferential direction U. The term “circumferential direction” U in this case refers to the quick-change adapter axis A.

The internal thread 6 of the hole saw 2 can be formed by any type of thread. For example, it is possible that the internal thread 6 is a metric ISO thread, a metric ISO fine thread, a trapezoidal thread, a Whitworth thread, a round thread, a buttress thread or the like. The thread can be designed as a right-hand or left-hand thread.

It is now essential that the first coupling section 9 has a first radial outer surface 11 with an external thread 12, that the second coupling section 10 is designed without threads, that the external thread 12 of the first coupling section 9 is in meshing engagement with the internal thread 6 of the hole saw 2 in a state connected to the hole saw 2 and that the second coupling section 10 is in one state connected to the hole saw 2 rests at least in sections against the internal thread 6 of the hole saw 2.

Due to the meshing engagement between the internal thread 6 of the hole saw 2 and the external thread 12 of the first coupling section 9, the hole saw 2 is coupled in the axial direction to the quick-change adapter 1. Due to the second coupling section 10, the coupling and uncoupling of a hole saw 2 with the quick-change adapter 1 can be implemented in a particularly simple manner, as will be explained below.

Here and preferably, the type of thread of the external thread 12 of the first coupling element 7 corresponds to the type of thread of the internal thread 6 of the hole saw 2.

The second coupling element 8 can have any geometric shape. For example, the coupling element can be cylindrical or at least partially cylindrical. It is also possible for the second coupling element 8 to be polygonal, circular, annular or similar in cross section perpendicular to the quick-change adapter axis A. Accordingly, the second coupling element 8 can have any corresponding shape in the radial direction in the area of the second coupling section 10.

Furthermore, it is preferably provided here that the second coupling section 10 has a substantially radial second outer surface 13. Alternatively, it is also possible for the second coupling section 10 to have a substantially conical second outer surface 13, as in 4b) is shown. In this way, the first coupling section 9 and the second coupling section 10 can be jammed in the bore 5 of the hole saw 2, as will be explained later. Here and preferably it is provided that the second outer surface 13 and the external thread 12 of the first coupling section 9 have a common center. It is then possible to obtain a particularly uniform rotational movement around the quick-change adapter axis A with as little or no unbalance as possible.

As already described, other configurations of the second coupling section 10 are also conceivable. For example, the second coupling element 8 in the area of the second coupling section 10 can be cylindrical and have a smaller diameter than the core diameter of the internal thread 6 of the hole saw 2, so that the second coupling section 10 rests essentially in a linear manner against the internal thread 6 of the hole saw 2.

As further shown in the figures and is preferred in this respect, the first coupling element 7 in the area of the first coupling section 9 and / or the second coupling element 8 in the area of the second coupling section 10 is at least partially circular. As shown in the figures, the first coupling section 9 and the second coupling section 10 are here and preferably at least partially circular. In this way, production can be carried out in a particularly simple manner. At the same time, it is possible to pass further components at least in sections between the first coupling element 7 and the second coupling element 8, as will be explained below.

Furthermore, it is preferably provided here that the outer diameter of the second outer surface 13 of the second coupling section 10 corresponds to the core diameter of the internal thread 6 of the hole saw 2, or that the outer diameter of the second outer surface 13 of the second coupling section 10 is smaller than the core diameter of the internal thread 6 of the hole saw 2 is. The term “smaller” in the present case means that the difference between the core diameter of the internal thread 6 of the hole saw 2 and the external diameter of the second coupling section 10 is so small that the external thread 12 of the first coupling section 9 is in meshing engagement with the internal thread 6 the hole saw 2 stands when the second outer surface 13 of the second coupling section 10 rests against the internal thread 6 of the hole saw 2. It is particularly advantageous if the outer diameter of the second outer surface 13 is 0.05 to 0.5 mm smaller than the core diameter of the internal thread 6 of the hole saw 2. In this way, there can be play between the first coupling element 7 and the second coupling element 8 on the one hand and the hole saw 2 on the other hand in the radial direction, which enables the connection between the quick-change adapter 1 and the hole saw 2 in a particularly simple manner.

Alternatively or additionally, it is provided that the core diameter of the internal thread 6 of the hole saw 2 is larger than the core diameter of the external thread 12 of the first coupling section 9, and/or that the outer diameter of the internal thread 6 of the hole saw 2 is larger than the nominal dimension of the external thread 12 of the first coupling section 9. The term “larger” in the present case is understood to mean any difference that ensures that the external thread 12 of the first coupling section 9 is in meshing engagement with the internal thread 6 of the hole saw 2 when the second outer surface 13 of the second coupling section 10 rests against the internal thread 6 of the hole saw 2.

Alternatively or additionally, it is preferably provided that the flank diameter of the internal thread 6 of the hole saw 2 corresponds to the flank diameter of the external thread 12 of the first coupling section 9. It is also conceivable that the flank diameter of the internal thread 6 and the flank diameter of the external thread 12 are designed differently.

In the preferred embodiment shown in the figures, it is provided that the outer diameter of the internal thread 6 of the hole saw 2 is larger than the nominal diameter of the external thread 12 of the first coupling element 7. At the same time, the core diameter of the external thread 12 of the first coupling element 7 is smaller than the core diameter of the internal thread 6 of the hole saw 2. It is particularly advantageous if the flank diameter of the internal thread 6 corresponds to the flank diameter of the external thread 12.

In order to easily connect the hole saw 2 to the quick-change adapter 1 and to easily detach the hole saw 2 from the quick-change adapter 1, it is preferably provided that the first radial outer surface 11 of the first coupling section 9 is at a smaller angle in the circumferential direction U than the second outer surface 13 of the second Coupling section 10 extends. Here and preferably, the first radial outer surface 11 of the first coupling section 9 and the second outer surface 13 of the second coupling section 10 together essentially form an angle of 360°.

In the present case, the term “essentially form an angle of 360°” is to be understood as meaning that the first coupling element 7 and the second coupling element 8 together form an angle of 360° in a plane perpendicular to the longitudinal axis, in particular in the circumferential direction U, whereby in A gap is provided in the circumferential direction U between the first coupling element 7 and the second coupling element 8 in order to enable a relative movement in the axial direction between the first coupling element 7 and the second coupling element 8.

Alternatively, it is also possible for the first radial outer surface 11 of the first coupling section 9 to extend in the circumferential direction U by a larger angle than the second outer surface 13 of the second coupling section 10. In addition, it can also be provided that the extent of the first coupling section 9 and the second coupling section 10 in the circumferential direction U is identical.

As in 3 shown as an example, it is further preferably provided that the first radial outer surface 11 of the first coupling section 9 in the circumferential direction U has an angle of 125° to 30°, preferably from 120° to 35°, more preferably from 110° to 45°, more preferably from 100° to 60°. It has been shown that the external thread 12 of the first coupling section 9, which extends over the aforementioned angles in the circumferential direction U, is sufficient for an axially fixed attachment of the hole saw 2 to the quick-change adapter 1.

Here and preferably it is provided that the maximum extent of the first coupling section 9 in a plane perpendicular to the quick-change adapter axis A is smaller than the core diameter of the internal thread 6 of the hole saw 2.

Furthermore, it is preferably provided here that the first coupling element 7 and the second coupling element 8 can be displaced relative to one another in the axial direction in order to establish a connection between the hole saw 2 and the coupling device 4 and/or to release a connection between the hole saw 2 and the coupling device 4 , in particular movable. Such a relative movement is particularly easy to carry out, whereby the establishment and/or release of a connection between the hole saw 2 and the coupling device 4 can be carried out manually in a particularly simple manner. It is then only necessary to displace the first coupling element 7 and the second coupling element 8 relative to one another in the axial direction.

In the embodiment shown in the figures and in this respect preferred, it is provided that the first coupling element 7 and the second coupling element 8 in the axial direction at least by the amount of the thread pitch of the external thread 12, more preferably at least by at least three times the amount of the thread pitch of the external thread 12 preferably around the axial extent E of the external thread 12 of the first coupling section 9, can be displaced relative to one another. This results in the second coupling section 10 coming from a coupling position in which the first coupling section 9 and the second coupling section 10 are next to each other in the circumferential direction U and are not arranged offset from one another in the axial direction, such that the first coupling section 9 and the second coupling section 10 have no overlap in the circumferential direction U, as in 3b) is shown as an example. The external thread 12 of the first coupling section 9 can then come out of engagement with the internal thread 6 of the hole saw 2 in a particularly simple manner, as will be described in detail below.

In the embodiment shown in the figures and to this extent preferred, it is further preferably provided that the first coupling element 7 is connected to the receiving shaft 3 in a rotationally fixed and axially fixed manner, that the second coupling element 8 is coupled in a rotationally fixed manner to the receiving shaft 3 and that the coupling device 4 has at least one has a connecting element 14 coupled in a rotationally fixed manner to the receiving shaft 3 for rotationally fixed engagement in a complementary connecting recess 15 of the hole saw 2 assigned to the connecting element 14. In the present case, the term “connected” is to be understood as meaning a non-positive, form-fitting and/or cohesive connection, which also includes a one-piece design of the receiving shaft 3 with the first coupling element 7. Here and preferably, the coupling device 4 has at least two, in particular exactly two, connecting elements 14, which enables a more uniform transmission of torque from the quick-change adapter 1 to the hole saw 2. Furthermore, here and preferably the connecting elements 14 are arranged evenly distributed around the circumference, as shown in FIG.

In order to couple the second coupling element 8 and the at least one connecting element 14 with the receiving shaft 3 in a rotationally fixed manner, it is preferably provided that the coupling device 4 has a handle component 16 which is coupled in a rotationally fixed manner to the receiving shaft 3 and is axially adjustable, in particular displaceable, relative to the receiving shaft 3. that the handle component 16 is connected to the second coupling element 8 in a rotationally fixed and axially fixed manner and that the handle component 16 is connected in a rotationally fixed and axially fixed manner to the at least one connecting element 14. In the present case, the term “connected” is understood to mean a positive, non-positive and/or cohesive connection, which also includes a one-piece formation of two components.

The handle component 16 can be gripped by a user and displaced in the axial direction relative to the receiving shaft 3, as in the transition from 3a) to 3b) is shown. In this way, the second coupling element 8 and the at least one connecting element 14 are adjusted together with the handle component 16 in the axial direction relative to the receiving shaft 3. As shown in the figures, here and preferably the handle component 16 is formed in one piece with the second coupling element 8. Furthermore, the at least one connecting element 14 is non-positively connected to the handle component 16, as shown in the figures.

Furthermore, it is preferably provided that the handle component 16 is adjustable, in particular displaceable, in a first axial direction the quick-change adapter 1 and the hole saw 2 can be adjusted, in particular displaceable, from the uncoupling position to the coupling position in a second axial direction X2 opposite the first axial direction X1.

In 3a) the handle component 16 is shown in its engaged position and is connected to the hole saw 2 in an axially fixed and rotationally fixed manner. By axially moving the handle component 16 in the first axial direction X1 ( 3b) ), the handle component 16 can be transferred to the uncoupling position, with both the second coupling element 8 being brought out of engagement with the internal thread 6 of the hole saw 2 and the at least one connecting element 14 being brought out of engagement with the connecting recess 15 of the hole saw 2, as in 3b) is shown. Conversely, with an opposite movement of the handle component 16 from the uncoupling position in the second axial direction X2 ( 3b) the handle component 16 can be moved into the engagement position.

The second coupling element 8 can be brought into engagement with the internal thread 6 of the hole saw 2 and the connecting element 14 can be brought into engagement with the connecting recess 15 of the hole saw 2, as in the transition from 3b) to 3a) is shown.

Here and preferably the handle component 16 can be fixed in its engaged position. In the present case, the term “fixable” means that the handle component 16 cannot be moved out of the engaged position in an uncontrolled manner when the quick-change adapter 1 is used as intended. In the preferred embodiment shown in the figures, it is preferably provided that the handle component 16 is biased in the axial direction against the receiving shaft 3, in particular by a spring element 17. How 2 shows, the spring element 17 biases the handle component 16 here and preferably into the engaged position. It is particularly advantageous if the handle component 16 is automatically adjustable in the second axial direction X2 by the pretension of the spring element 17. In the figures, the spring element 17 is designed as a spiral-shaped compression spring.

Alternatively or additionally, it is also conceivable that the receiving shaft 3 has an external receiving shaft thread, with a lock nut being in meshing engagement with the external shaft external thread. The lock nut can then be designed to fix the handle component 16 in its engaged position. If the lock nut is loosened, the handle component 16 can be adjusted from its engaged position to the uncoupled position. The external thread of the receiving shaft can also be designed as a left-hand thread to prevent it from loosening on its own. Other ways of fixing the handle component 16 in its engaged position are also possible.

As in 3a) shown, it is preferably provided that the handle component 16 has a first axial end face 18 which is in engagement with an axial support surface 19 of the first coupling element 7 in the coupling position and that the handle component 16 has a second axial end face 20 which is in the uncoupling position a stop 21 of the receiving shaft 3 can be brought into engagement. Here and preferably, the first axial end face 18 and the second axial end face 20 are oriented away from each other.

In this way, the handle component 16 is held captively on the receiving shaft 3. The handle component 16 is then fixed to the receiving shaft 3 in the axial direction. If the first axial end face 18 comes into engagement with the axial support surface 19 of the first coupling element 7, this can serve as a visual, acoustic and/or haptic indication to the user that the handle component 16 has reached its engagement position. However, if the second axial end face 20 comes into engagement with the stop 21 of the receiving shaft 3, this can serve as a visual, acoustic and/or haptic indication to the user that the handle component 16 has reached its uncoupling position.

In 3 and 4 the removal of the quick-change adapter 1 from the hole saw 2 is shown. As with the transition from 3b) to 4a) shown, it is preferably provided that in order to release the quick-change adapter 1 from the hole saw 2, the quick-change adapter 1 is displaceable in a radial direction after the handle component 16 has been transferred into its uncoupling position in such a way that the external thread 12 of the first coupling element 7 is out of engagement with the internal thread 6 the hole saw 2 comes, so that the quick-change adapter 1 can be separated from the hole saw 2 in the axial direction. The transition from 4a) to 4b) and 4c ) shows the axial movement between the quick-change adapter 1 and the hole saw 2, where in 4b) the quick change adapter 1 and in 4c ) the hole saw 2 are each shown individually.

The reverse sequence of 4b) and 4c ) above 4a) and 3b) to 3a) shows connecting the quick-change adapter 1 to the hole saw 2. As shown by the transition from 4c ) and 4b) above 4a) to 3b) shown, it is additionally or alternatively possible for the quick-change adapter 1 to be movable in the axial and radial directions after the handle component 16 has been transferred into its uncoupling position in order to connect the quick-change adapter 1 to the hole saw 2 in such a way that the external thread 12 of the first coupling element 7 is in Engagement with the internal thread 6 of the hole saw 2 comes so that the handle component 16 can be brought into its engaged position. When the handle component 16 is transferred into its engaged position, the second outer surface 13 of the second coupling section 10 then comes into engagement with the internal thread 6 of the hole saw 2 in such a way that an axially fixed connection is created between the hole saw 2 and the quick-change adapter 1.

The second outer surface 13 can be essentially radial, i.e. essentially cylindrical, or conical. In both cases, the quick-change adapter 1 is connected to the hole saw 2 in an axial and rotation-proof manner when the handle component 16 is engaged. In 4b) the second outer surface 13 is shown as a cylindrical outer surface in a solid line and as a conical outer surface in a dashed line. A conical design can advantageously cause jamming between the first coupling element 7 and second coupling element 8 on the one hand and the internal thread 6 of the hole saw 2 on the other hand and/or compensate for any existing play in the radial direction.

A hole saw arrangement 22 with a hole saw 2 and a proposed quick-change adapter 1 is proposed.

Reference may be made to all statements regarding the proposed quick-change adapter 1.

What is proposed is a method for establishing and/or releasing a connection between a hole saw 2 and a quick-change adapter 1 according to the proposal, wherein the quick-change ladapter 1 has a receiving shaft 3 for connection to a machine tool for discharging rotational movements about a quick-change adapter axis A and a coupling device 4 for axially fixed and in particular rotationally fixed connection of the quick-change adapter 1 to a hole saw 2, the coupling device 4 being designed to provide an axially fixed connection with a radial internal thread 6 of a recess of the hole saw 2, the coupling device 4 having a first coupling element 7 with a first coupling section 9 and a second coupling element 8 with a second coupling section 10 for connection to the radial internal thread 6 of the hole saw 2.

It is now essential that in order to release and/or establish a connection between the quick-change adapter 1 and the hole saw 2, the second coupling element 8 is adjusted, in particular displaced, relative to the first coupling element 7 in the axial direction.

In this respect, reference may be made to all statements regarding the proposed quick-change adapter 1 and the proposed hole saw arrangement 22.

Reference symbol list

1

Quick change adapter

2

Hole saw

3

receptiveness

A

Quick change adapter axle

4

Coupling device

b

Hole saw axis

5

drilling

6

inner thread

7

first coupling element

8th

second coupling element

9

first coupling section

10

second coupling section

U

Circumferential direction

11

first radial outer surface

12

External thread

13

second outside surface

E

axial extent

14

connecting element

15

connection recess

16

Handle component

X1

first axial direction

X2

second axial direction

17

Spring element

18

first axial end face

19

Support surface

20

second axial end face

21

attack

22

Hole saw assembly

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 3429789 A1 [0002]

Claims (15)

Quick-change adapter for attaching a hole saw (2) to a machine tool with a receiving shaft (3) for connection to a machine tool for expelling rotational movements about a quick-change adapter axis (A), with a coupling device (4) for axially fixed and in particular rotationally fixed connection of the quick-change adapter (1) with a hole saw (2), the coupling device (4) being designed to form an axially fixed connection with a radial internal thread (6) of a recess in the hole saw (2), the coupling device (4) having a first coupling element (7). first coupling section (9) and a second coupling element (8) with a second coupling section (10) for connection to the radial internal thread (6) of the hole saw (2), characterized in that the first coupling section (9) has a first radial outer surface ( 11) with an external thread (12), that the second coupling section (10) is designed without threads, that the external thread (12) of the first coupling section (9) in a state connected to the hole saw (2) is in meshing engagement with the internal thread ( 6) of the hole saw (2) and that the second coupling section (10) rests at least in sections against the internal thread (6) of the hole saw (2) in a state connected to the hole saw (2). Quick change adapter Claim 1 , characterized in that the second coupling section (10) has a substantially radial second outer surface (13), or that the second coupling section (10) has a substantially conical second outer surface (13), preferably that the second outer surface (13 ) and the external thread (12) of the first coupling section (9) have a common center. Quick change adapter Claim 1 or 2 , characterized in that the first coupling element (7) in the area of the first coupling section (9) and / or the second coupling element (8) in the area of the second coupling section (10) are at least partially circular. Quick-change adapter according to one of the preceding claims, characterized in that the outer diameter of the second outer surface (13) of the second coupling section (10) corresponds to the core diameter of the internal thread (6) of the hole saw (2), or that the outer diameter of the second outer surface (13) of the second coupling section (10) is smaller than the core diameter of the internal thread (6) of the hole saw (2), and/or that the core diameter of the internal thread (6) of the hole saw (2) is larger than the core diameter of the external thread (12) of the first coupling section (9), and / or that the outer diameter of the internal thread (6) of the hole saw (2) is larger than the nominal size of the external thread (12) of the first coupling section (9), and / or that the flank diameter of the internal thread ( 6) the hole saw (2) corresponds to the flank diameter of the external thread (12) of the first coupling section (9). Quick-change adapter according to one of the preceding claims, characterized in that the first radial outer surface (11) of the first coupling section (9) extends in the circumferential direction (U) by a smaller angle than the second outer surface (13) of the second coupling section (10), preferably in that the first radial outer surface (11) of the first coupling section (9) and the second outer surface (13) of the second coupling section (10) together essentially form an angle of 360°. Quick-change adapter according to one of the preceding claims, characterized in that the first radial outer surface (11) of the first coupling section (9) has an angle in the circumferential direction (U) of 125° to 30°, preferably of 120° to 35°, more preferably of 110 ° to 45°, more preferably from 100° to 60°. Quick-change adapter according to one of the preceding claims, characterized in that the first coupling element (7) and the second coupling element (8) are used to establish a connection between the hole saw (2) and the coupling device (4) and/or to release a connection between the hole saw (2) and the coupling device (4) can be displaced, in particular displaceable, relative to one another in the axial direction. Quick-change adapter according to one of the preceding claims, characterized in that the first coupling element (7) and the second coupling element (8) in the axial direction at least by the amount of the thread pitch of the external thread (12), more preferably at least by at least three times the amount of the thread pitch of the external thread (12), further preferably around the axial extent (E) of the external thread (12) of the first coupling section (9), can be displaced relative to one another. Quick-change adapter according to one of the preceding claims, characterized in that the first coupling element (7) is connected to the receiving shaft (3) in a rotationally fixed and axially fixed manner that is, that the second coupling element (8) is coupled in a rotationally fixed manner to the receiving shaft (3) and that the coupling device (4) has at least one connecting element (14) which is coupled in a rotationally fixed manner to the receiving shaft (3) for rotationally fixed engagement in one of the connecting element (14). assigned, complementary connecting recess (15) of the hole saw (2), preferably that the coupling device (4) has at least two, in particular exactly two, connecting elements (14), more preferably that the connecting elements (14) are arranged evenly distributed around the circumference . Quick-change adapter according to one of the preceding claims, characterized in that the coupling device (4) has a handle component (16) which is coupled in a rotationally fixed manner to the receiving shaft (3) and is axially adjustable, in particular displaceable, relative to the receiving shaft (3), that the handle component (16) is connected in a rotationally fixed and axially fixed manner to the second coupling element (8) and that the handle component (16) is connected in a rotationally fixed and axially fixed manner to the at least one connecting element (14). Quick-change adapter according to one of the preceding claims, characterized in that the handle component (16) for releasing the connection between the quick-change adapter (1) and the hole saw (2) is adjustable, in particular displaceable, in a first axial direction (X1) from a coupling position to a decoupling position , and that the handle component (16) for establishing a connection between the quick-change adapter (1) and the hole saw (2) can be adjusted from the uncoupling position to the coupling position in a second axial direction (X2) opposite the first axial direction (X1), in particular displaceable, is, preferably that the handle component (16) can be fixed in its engaged position, more preferably that the handle component (16) is biased in the axial direction against the receiving shaft (3), in particular by a spring element (17), more preferably that the handle component (16) can be automatically adjusted in the second axial direction (X2) by the preload. Quick-change adapter according to one of the preceding claims, characterized in that the handle component (16) has a first axial end face (18) which in the coupling position engages with an axial support surface (19) of the first coupling element (7) and that the handle component ( 16) has a second axial end face (20) which can be brought into engagement with a stop (21) of the receiving shaft (3) in the uncoupling position, preferably that the first axial end face (18) and the second axial end face (20) are apart from each other are oriented facing away. Quick-change adapter according to one of the preceding claims, characterized in that in order to release the quick-change adapter (1) from the hole saw (2), the quick-change adapter (1) can be displaced in a radial direction after the handle component (16) has been transferred into its uncoupling position in such a way that the External thread (12) of the first coupling section (9) comes out of engagement with the internal thread (6) of the hole saw (2), so that the quick-change adapter (1) can be separated from the hole saw (2) in the axial direction, and / or that for connecting the quick-change adapter (1) with the hole saw (2), the quick-change adapter (1) can be moved in the axial and radial directions after the handle component (16) has been transferred into its uncoupling position in such a way that the external thread (12) of the first coupling section (9) is in Engagement occurs with the internal thread (6) of the hole saw (2), so that the handle component (16) can be brought into its engaged position. Hole saw arrangement with a hole saw (2) and a quick-change adapter (1) according to one of the preceding claims. Method for establishing and/or releasing a connection between a hole saw (2) and a quick-change adapter (1) according to one of Claims 1 until 13 , wherein the quick-change adapter (1) has a receiving shaft (3) for connection to a machine tool for conducting rotational movements about a quick-change adapter axis (A) and a coupling device (4) for axially fixed and in particular rotationally fixed connection of the quick-change adapter (1) to a hole saw (2) has, wherein the coupling device (4) is designed to form an axially fixed connection with a radial internal thread (6) of a recess in the hole saw (2), wherein the coupling device (4) has a first coupling element (7) with a first coupling section (9) and a second coupling element (8) with a second coupling section (10) for connection to the radial internal thread (6) of the hole saw (2), characterized in that for establishing and / or releasing a connection between the quick-change adapter (1) and the Hole saw (2), the second coupling element (8) is adjusted, in particular displaced, in the axial direction relative to the first coupling element (7).

Images