DE20303664U1 - Quick joining and -release chucks, operated with spring supported ball, engaging with recess at shaft of tool - Google Patents

Abstract

For insertion the upper end of the tool shaft is pressed against the release element (10) acting on a spring (9) and causing a ball (12) to move to the bottom of a recess (17) at the release element (10). A tensioning ring (13) is moved into a locked position simultaneously to a second, a locking ball (19) engaging with a recess located at the shaft. When the tensioning ring (13) is moved into the opposite direction against the forces of the spring (14), the locking ball (19) is moved into a deeper recess (21), facilitating the release of the release element (10) by moving the first ball (12).

Description

title

Quick chuck for drilling tools

Description

The invention relates to a quick-action chuck with an imaginary axis of rotation for a drilling tool with a cylindrical shaft and a locking recess.

Such a quick-change chuck comprises a tool shank receiving part with an axially symmetrical receiving bore of the tool shank, a spring-loaded ejection element for the drilling tool and a spring-loaded clamping ring.

Such quick-action chucks are used for the automatic locking of tools, which can be easily replaced.

The European patent application EP 1016480 describes a quick-action chuck, which is shown in FIGS. 6, 7 and this document.

FIG. 6 shows

a partial sectional view of this quick-action chuck according to the state of the art. Extracts of details of the chuck are shown in FIG.7 and FIG.8.

FIG. 7 shows

a partial sectional view of the quick-action chuck according to FIG. 6 for an open position (without inserted or clamped drilling tool).

FIG.8 shows

a partial sectional view of the quick chuck

U-03-002

as shown in FIG. 6 for a closed position (with inserted or clamped tool).

In FIGS. 6, 7 and 8 the same parts are marked with the same reference numbers.

A first compression spring 11* acting in the direction of the receiving opening of the quick-action chuck is arranged in an axial bore of the tool holder part 1*.

A bore is provided in the wall of the tool holder part 1*, in which a tool locking ball 5* (with a diameter larger than the wall thickness) is arranged.

This ball 5* can be moved in the +x and - x directions as long as it is not prevented from doing so by stops.

In the open position of the quick-action chuck (FIG.7), movement of the ball 5* in the -x direction (locking direction) is not possible due to the stop 6*. This stop 6* can be moved in the +y direction against the force of a second compression spring 8*.

When the quick-clamping chuck is in the open position, the clamping ring 3* assumes a position in which the ball 5* protrudes into an inner recess 3a* of the clamping ring 3*. In this position, the clamping ring is pre-tensioned by a third compression spring 4* acting in the +y direction.

In the closed position of the quick-action chuck (FIG. 6 and 8), the stop 6* is displaced by a bevel 21* on the workpiece 20* against the force of the second compression spring 8* upwards in the +γ direction; the clamping ring 20* is in the closed position of the quick-action chuck (FIG. 6 and 8) in- y

ϕ ϕ
φφφ ·· ·

φ ·

U-03-002

Direction is shifted in relation to the representation in FIG. 7 (open position) such that its inner projection 3e* holds the ball 5* in the -x direction in the recess 23* of the workpiece 20*, locking it.

This quick-action chuck with a translatory clamping ring displacement (towards the chuck face and opposite thereto) requires three compression springs, one of which is required solely for the movable stop 6*.

It is an object of the invention to provide a quick-action chuck with a translatory clamping ring displacement, which can be realized with few parts and which is simple and inexpensive to manufacture.

This issue of the invention is solved by the features of claim 1.

Further developments of the invention are characterized by the subclaims.

Embodiments of the invention are shown in the drawings and are described in more detail below. They show:

a sectional view of a first embodiment of the quick-action chuck according to the invention in the open position (without inserted tool);

a sectional view of the quick-action chuck according to the invention according to FIG. 1 in closed position ( with

···· ·· ··
· · · · · • ··
· · · ·
•
• •
· · * *
•
·· · ·
· · · ·
· U-03-002 · · · ·
· · · · •
· ·
· •
· ·
· ·
· · · · ·
· ·
· ···· ···· ·· ·* · •

drilling tool introduced but not shown);

a schematic side view of a drilling tool with a cylindrical shank and a locking recess;

a partial sectional view of the quick-clamping chuck according to the invention in another embodiment for an open position of the quick-clamping chuck;

a partial sectional view of the quick-action chuck according to FIG. 4 for a closed position;

a partial sectional view of a state-of-the-art quick-change chuck;

FIG.7

a partial sectional view of the quick-action chuck according to FIG.6 in the open position (without inserted or clamped tool);

a partial sectional view of the quick-action chuck according to FIG. 6 in the closed position (with inserted or clamped tool).

In the following, reference is made to the first embodiment of the quick-action chuck according to the invention according to FIGS. 1 and 2. The same parts in the illustrations of FIGS. 1 and 2 have the same reference numerals.

The quick-action chuck 1 for the drilling tool 3 (FIG.3) with IM.. .::. ^: .. ^: ·.. ^{: :} .. ^: ·.. ^{: :} ..·..· : ··.·.:· u_ ₀₃ .. ₀₀₂

a cylindrical shaft 4 has an imaginary axis of rotation 2.

The end region of the tool 3 has at least one clamping surface recess 5, which serves to lock the drilling tool in the cutting chuck.

The quick-action chuck comprises a tool shank receiving part (spindle) 6 with an axially(2) symmetrical receiving bore 7 for receiving the tool shank on the chuck front side 8.

After inserting the tool into the quick-change chuck, it is locked as follows:

A ball 19 (tool locking ball) is arranged in the wall opening 18 (bore) of the drilling spindle 6; this is displaced in the direction w towards the rotation axis 2 until a ball segment 19s (FIG.2) engages in the clamping surface recess 5 of the tool 3 inserted into the receiving bore 7 and thereby ensures locking in the axial and rotational directions.

At the end of the receiving bore 7, which is remote from the chuck face (8), there is an ejection element 10 which is axially movable and is acted upon by a compression spring (9) in the direction of the chuck face 8. The compression spring 9 serves to eject the drilling tool.

The wall of the tool shank receiving part 6 has at least one wall opening 11 (bore) with a wall thickness dl in the area of the ejection element 10 in the end area of the receiving bore 7.

In the wall opening 11 a ball 12 with a

U-03-002

·

•#

·

·

Diameter D12>dl. This ball (ejection element locking ball) serves to lock the ejection element 10 as soon as the tool is inserted into the receiving bore 7.

This ejection element locking ball 12 is displaceable within the wall opening 11 (in direction 1) towards the axis of rotation and opposite thereto (in direction -1).

The tool shank receiving part 6 is enclosed by a clamping ring 13 which can be displaced translationally in the -d direction towards the chuck front face 8 and opposite thereto (in the d direction).

This clamping ring 13 is subjected to a compression spring (14) in the direction of the chuck front face 8.

The ejection element 10 has on its outside an outer recess 17 adjoining its end region 16 in the direction of the chuck front side 8.

The ejection element 10 thus shows, in an imaginary sectional plane running through the rotation axis 2, a step-like shoulder on its outer side with a step 16 further away from the axis and a step 17 closer to the axis adjoining it in the direction of the chuck front face 8.

The clamping ring 13 has on its inner side an inner recess 24 adjoining its end region 15 in the direction of the chuck front side 8.

The clamping ring 13 thus has, in an imaginary cutting plane running through the rotation axis 2, a step-like shoulder on its inner side with a step 15 closer to the axis and a step 16 extending in the direction of the chuck face 8.

U-03-002

the adjoining, more distant from the axis, step 24.

In the open position of the quick-action chuck (FIG.l), i.e. when the tool is not inserted, the end region 16 of the ejection element 10 is located in front of the wall opening 11 on the inside of the receiving bore. As a result, the path of the ejection element locking ball 12 into the interior of the receiving bore 7 remains blocked (FIG.l).

In this open position of the quick-action chuck 1, the ejection element locking ball 12 projects into the recess 24 of the clamping ring 13; it is arranged between the end region 16 of the ejection element 10 and the recess 24 of the clamping ring 13 or between the step 24 of the clamping ring 13 furthest from the axis and the step 16 of the ejection element 10 closer to the axis.

In the open position of the quick-action chuck, the position of the clamping ring 13 is determined by the compression spring 14 acting in the -d direction and by the fact that the ejection element locking ball 12 protruding from the wall opening 11 in the -1 direction forms a stop for the inclined shoulder ST between the recess 24 and the end region 15 of the clamping ring 13 when the clamping ring moves in the -d direction.

In this position of the clamping ring with the chuck open, the tool locking ball 19 protrudes into the interior of the receiving bore 7 without locking.

At least one wall opening 18 is arranged as a bore in the wall of the tool shank receiving part 6 in the area close to the chuck end faces (8) outside the area of the ejection element 10.

U-03-002

In this wall opening 18, the tool locking ball 19 is arranged with a diameter D19 larger than the wall thickness d2.

The tool locking ball 19 is displaceable within the wall opening 18 in the w direction towards the rotation axis 2 and opposite thereto (in the -w direction).

The wall opening 18 has a stop 20 towards the inside of the receiving bore 7, by which the displaceability of the ball 19 in the w direction towards the rotation axis 2 is limited in such a way that (with the chuck closed - see FIG. 2) only the ball segment 19s projects into the receiving bore.

The clamping ring 13 has on its inner side an inner recess 21 near the chuck end face (8) and an inner recess 22 far from the chuck end face, which are connected to one another by a bevel 23.

The clamping ring 13 thus shows, in an imaginary sectional plane running through the axis of rotation, on its inner side a step-like shoulder with a step 21 further away from the axis and a step 22 closer to the axis adjoining it in the direction facing away from the clamping chuck end faces.

The depth of the recess 21 is greater than that of the recess 22; when the chuck 1 is in the open position, the tool locking ball 19 is arranged in the recess 21 and the wall opening 18 in such a way that its part near the receiving bore (7) does not protrude (lockingly) into the receiving bore 7.

The ball 19 or the ball-like element is in open

U-03-002

·

·

Position of the chuck 1 on the step 21 furthest from the axis and arranged in the wall opening 18 such that its part near the receiving bore (7) does not protrude into the receiving bore 7 in a locking manner;

the ball 19 or the ball-like element is arranged in the closed position of the chuck 1 on the step 22 closest to the axis and in the wall opening 18 in such a way that its part closest to the receiving bore (7) projects into the receiving bore 7 as a ball segment 19s and thereby engages in the recess 5 of the imaginary tool 3 in a locking manner.

When the tool shank 4 is inserted into the receiving bore 7 of the spindle 1, the quick-clamping chuck moves into the closed position as follows ( FIG. 2):

The upper end of the tool shaft 4 is pressed against the ejection element 10 (FIG.l), whereby the latter is displaced against the force of the ejection spring 9 in direction d to such an extent that the ejection element locking ball 12 can move in the 1 direction to the bottom of the recess 17; this eliminates its stop effect for the edge ST of the clamping ring 13 loaded by the compression spring (14), which is therefore moved in the -d direction.

At the same time, the clamping ring 13 is also moved in the -d direction at the location of the tool locking ball 19. The ball 19 thereby moves from the recess 21 via the bevel 23 into the recess 22 (with the smaller depth); the ball is therefore pressed in the w direction until its ball segment 19s protrudes into the receiving bore and there engages in the clamping surface recess 5 of the tool 3 in a locking manner.

To release the tool from the keyless chuck, the clamping ring 13 is moved against the force of the spring 14 in direction d; this releases the locking between the tool

U-03-002

Locking ball 19 and the locking recess 5 on the tool shaft are released, the tool locking ball can move into the deeper recess 21; while the ejection element locking ball 12 moves in the 1- direction into the recess 24; as a result, the ejection element 10 is no longer locked and the compression spring 9 can move the ejection element 10 in the direction -d, whereby the tool is pushed out of the receiving bore.

FIG.4 and FIG.5 show

each show a partial sectional view of the quick-action chuck according to the invention in a different embodiment than that shown in FIGS. 1 and 2.

FIG. 4 shows the open position of the quick-change chuck (without a drilling tool inserted, FIG. 3 ) and FIG. 5 shows the closed position (for a drilling tool inserted, but not shown for reasons of clarity).

In this quick-action chuck 1', the drilling tool is locked by means of the ball 19' which can be actuated by the clamping ring 13' and the ejection element is locked via the spring (F')-loaded lever element L with two lever arms L1 and L2 and a pivot point R'. The lever element is arranged in a recess in the tool shaft receiving part 6'.

The ends of both lever arms Ll and L2 are designed in a special way, as can be seen from the illustration in FIGS. 4 and 5, in order to be able to engage in the corresponding inner recess 13'-E of the clamping ring 13' or in the corresponding outer recess 10'-E of the ejection element 10'. The spring F' (only indicated schematically) is a compression spring which acts on the lever arm Ll in the direction η.

The ejection element 10' is pushed in the direction m by the compression spring ···; .·· .*· i Il ·!

9'; the clamping ring 13' is urged in the direction &ogr; by a compression spring (not shown).

In the closed position of the chuck 1', the ejection element 10' is locked by the lever L which can be actuated via the clamping ring 13' (Vl locking parts).

In the open position of the chuck 1', the ejection element 10' is unlocked (not shown, but explained later) or locked (V2 locking point) by the lever L which can be operated via the clamping ring.

The Vl locking position is achieved as follows: The drilling tool shaft is inserted in the open chuck (FIG.4) in the direction of &rgr;. Its upper end presses against the ejection element 10' acted upon by the compression spring (9'); the end of the lever arm Ll is pressed against the force of the spring F' out of the locking point Vl of the recess 10'-E; the end of the lever arm L2 pivots out of the locking point V3 of the recess 13-E' and thereby releases the clamping ring 13', which is moved in the direction &ogr; (by a compression spring not shown).

At least one wall opening 18' (bore) is arranged in the wall of the tool shank receiving part 6' in the area close to the chuck face 8' outside the area of the ejection element 10'. A ball 19' with a diameter D19' larger than the wall thickness or a ball-like element is arranged in this wall opening 18'.

The ball 19' or the ball-like element is displaceable within the wall opening 18' toward or opposite to the axis of rotation 2'.

The wall opening 18' has a stop 20' on the inside of the receiving bore 7',
which allows the ball 19' or the ball-like element to be displaced in the direction of the rotation axis 2'

U-03-002

limited.

The clamping ring 13' has, in an imaginary cutting plane running through the rotation axis 2', on its inner side a step-like shoulder with a step 21' further away from the axis and, in a direction facing away from the clamping chuck end faces 8, an adjoining step 22' closer to the axis. Both steps are connected to one another by a bevel 23'.

The ball 19' or the ball-like element is arranged in the open position of the chuck 1' on the step 21' and in the wall opening 18' in such a way that its part near the receiving bore (7') does not protrude into the receiving bore 7' in a locking manner.

The ball 19' or the ball-like element is arranged in the closed position of the chuck 1' on the step 22' and in the wall opening 18' in such a way that its part closest to the receiving bore (T ) projects as a ball segment 19s' into the receiving bore (7') and thereby engages in a locking manner in the recess 5 of the imaginary tool 3 (FIG. ).

When the end of the lever arm L2 swings out of the locking position V3 of the recess 13'-E when the drilling tool is inserted into the receiving bore 7' of the chuck 1', the clamping ring 13' is displaced in the direction &ogr; by the compression spring (not shown). The bevel 23' presses the ball 19' further into the bore 18 ^&lgr; up to the stop 20'. The ball thus moves from the step 21' to the step 22', in which it assumes a locking position for the drilling tool (FIG.5).

In this locking position,

a) the end of the lever arm Ll in the locking position Vl of the recess 10'-E of the locking element 10' and

U-03-002

b) the end of the lever arm L2 into the locking position V4 of the recess 13'-E of the clamping ring 13'.

This also locks the ejection element 10'.

When the drilling tool is removed from the chuck 1' (FIG.5 ), the clamping ring 13' is moved in the direction -o against the force of a compression spring (not shown). The end of the lever arm L2 comes to the area x of the recess 13'-E of the clamping ring 13'. The other lever arm Ll swings out of the locking point Vl of the recess 10'-E of the ejection element 10' and goes via the area y into the locking point V2 of the recess 10'-E of the ejection element moved in the direction m by spring force; at the same time the end of the lever arm L2 comes to the locking point V3.

In this position, the ejection element 10' is locked when the chuck 1' is in the open position. However, design solutions are also possible in which the ejection element is not locked when the clamping ring is in the open position. For this purpose, the area in the ejection element to the left of the locking point V2 could be cut out so that the end of the lever arm L1 does not hit a stop when the ejection element 10' moves in the direction m.

It should be noted that instead of the balls 12, 19 and 19', ball-like elements can also be used as long as they can fulfill the locking function; such ball-like elements can be, for example, ellipsoids or rod-shaped elements with rounded ends.

U-03-002

Claims (3)

1. Quick-action chuck with imaginary axis of rotation for a drilling tool with a cylindrical shaft with at least one recess for the clamping lock,
with a tool shank receiving part with an axially symmetrical receiving bore for receiving the tool shank via the chuck front side,
with an axially movable ejection element for the drilling tool connected to an ejection spring,
with a spring-loaded clamping ring that surrounds the tool shank receiving part and can be moved in the direction of the chuck face and in the opposite direction,
characterized in that
in a first position of the clamping ring ( 13 ; 13 ') via a first locking element ( 19 ; 19 ') operable by it ( 13 ; 13 '), the drilling tool ( 3 ) and
that in a second position of the clamping ring ( 13 ; 13 ') the ejection element ( 10 ; 10 ') can be locked via a second locking element ( 12 ; L) which can be actuated by it ( 13 ; 13 '),
that when the drilling tool is locked, the ejection element ( 10 ; 10 ') is also locked and
that when the drilling tool is unlocked the ejection element ( 10 ; 10 ') is locked or unlocked. 2. Arrangement according to claim 1, characterized in
that the wall of the tool shank receiving part ( 6 ) in the region of the ejection element ( 10 ) has at least one wall opening ( 11 ) with a wall thickness (d1),
that a ball ( 12 ) with a diameter D12 > d1 or a ball-like element is arranged in the wall opening ( 11 ),
that the ball ( 12 ) or the ball-like element is displaceable within the wall opening ( 11 ) towards or opposite to the axis of rotation ( 2 ),
that a clamping ring ( 13 ) is provided which surrounds the tool shank receiving part ( 6 ) and can be moved in the direction of the chuck front face ( 8 ) or in the opposite direction,
that this clamping ring ( 13 ) is loaded with a compression spring ( 14 ) in the direction of the chuck front side ( 8 ),
that this clamping ring ( 13 ) has, in an imaginary cutting plane running through the rotation axis ( 2 ), on its inner side a step-like shoulder with a step ( 15 ) closer to the axis and a step ( 24 ) further away from the axis adjoining it in the direction of the chuck front face ( 8 ),
that the ejection element ( 10 ) has, in an imaginary cutting plane running through the rotation axis ( 2 ), on its outside a step-like shoulder with a step ( 16 ) further away from the axis and a step ( 17 ) closer to the axis adjoining it in the direction of the chuck front face ( 8 ),
that the ball ( 12 ) or the ball-like element is arranged in the open position of the chuck ( 1 ) between the axially remote step ( 16 ) of the ejection element ( 10 ) and the axially remote step ( 24 ) of the clamping ring ( 13 ),
that the ball ( 12 ) is arranged in the closed position of the chuck ( 1 ) between the step ( 15 ) of the clamping ring ( 13 ) closest to the axis and the step ( 17 ) of the ejection element ( 10 ) closest to the axis,
that in the wall of the tool shank receiving part ( 6 ) in the area close to the chuck face ( 8 ) outside the area of the ejection element ( 10 ) at least one wall opening ( 18 ) is arranged,
that a ball ( 19 ) with a diameter D19 greater than the wall thickness d2 or a ball-like element is arranged in the wall opening ( 18 ),
that the ball ( 19 ) or the ball-like element is displaceable within the wall opening ( 18 ) towards or opposite to the axis of rotation ( 2 ),
that the wall opening ( 18 ) has a stop ( 20 ) on the inside of the receiving bore ( 7 ) which limits the displaceability of the ball ( 19 ) or the ball-like element in the direction of the axis of rotation ( 2 ),
that the clamping ring ( 13 ) has a step-like shoulder on its inside in an imaginary cutting plane running through the axis of rotation
with a step further away from the axis ( 21 ) and
with a step ( 22 ) closer to the axis in the direction facing away from a clamping chuck end face,
that the ball ( 19 ) or the ball-like element is arranged in the open position of the chuck ( 1 ) on the step ( 21 ) furthest from the axis and in the wall opening ( 18 ) in such a way that its part near the receiving bore ( 7 ) does not protrude into the receiving bore ( 7 ) in a locking manner,
that the ball ( 19 ) or the ball-like element is arranged in the closed position of the chuck ( 1 ) on the step ( 22 ) closest to the axis and in the wall opening ( 18 ) in such a way that its part closest to the receiving bore ( 7 ) projects as a ball segment ( 19s ) into the receiving bore ( 7 ) and thereby engages in a locking manner in the recess ( 5 ) of the imaginary tool ( 3 ). 3. Arrangement according to claim 1, characterized in that
that the wall of the tool shank receiving part ( 6 ') has at least one recess,
in which a spring-loaded (F') pivotable two-armed lever (L') is arranged, the lever arm ends (L1', L2') of which can engage in an outer recess ( 10 '-E) of the ejection element ( 10 ') and in an inner recess ( 13 '-E) of the clamping ring ( 13 ') in such a way that
that in the closed position of the chuck ( 1 ') the ejection element ( 10 ') is locked,
that in the open position of the chuck ( 1 ') the ejection element ( 10 ') is unlocked or locked,
that in the wall of the tool shank receiving part ( 6 ') in the area close to the chuck face ( 8 ') outside the area of the ejection element ( 10 ') at least one wall opening ( 18 ') is arranged,
that a ball ( 19 ') with a diameter D19' larger than the wall thickness or a ball-like element is arranged in the wall opening ( 18 '),
that the ball ( 19 ') or the ball-like element is displaceable within the wall opening ( 18 ') towards or opposite to the axis of rotation ( 2 '),
that the wall opening ( 18 ') has a stop ( 20 ') on the inside of the receiving bore ( 7 '),
which limits the displaceability of the ball ( 19 ') or the ball-like element in the direction of the axis of rotation ( 2 '),
that the clamping ring ( 13 ') has a step-like shoulder on its inner side in an imaginary cutting plane running through the rotation axis ( 2 ')
with a step further off the axis ( 21 ') and
with a step ( 22 ') closer to the axis in the direction away from the chuck face,
that the ball ( 19 ') or the ball-like element is arranged in the open position of the chuck ( 1 ') on the step ( 21 ') and in the wall opening ( 18 ') in such a way that its part near the receiving bore ( 7 ') does not protrude into the receiving bore ( 7 ') in a locking manner,
and that the ball ( 19 ') or the ball-like element is arranged in the closed position of the chuck ( 1 ') on the step ( 22 ') and in the wall opening ( 18 ') in such a way that
that its part closest to the receiving bore ( 7 ') projects as a spherical segment ( 19s ') into the receiving bore ( 7 ') and thereby engages in a locking manner in the recess ( 5 ) of the imaginary tool ( 3 ).