Drill chuck

Abstract

The invention relates to a drill chuck (1) with a chuck body (2) which can be connected to a drill spindle, in which a chuck jaw (4) is arranged in a guide housing (3) which extends obliquely to the chuck axis, the chuck jaw being adjustable for opening and closing by means of a threaded ring (5) which is arranged in a rotationally and axially non-movable manner relative to the chuck body (2), a locking device which consists of a coaxial toothing (6) of a locking groove and at least one locking element (7) which is inserted into the locking groove under the action of a locking spring (8), an adjustment sleeve (9) which is limited in rotation between stops (21), by means of the rotation of which the locking element (7) can be adjusted, and a latching device (22) which forms two latching positions (23) in the circumferential direction. Between the adjustment sleeve (9) and the component which is adjacent to this in the radial direction, an anti-vibration device (24) is arranged.

Description

Technical Field

[0001] This invention relates to a drill chuck comprising: a chuck body connectable to a drill spindle, wherein jaws are arranged in a guide housing extending inclined to the chuck axis, the jaws being adjustable for opening and closing via a threaded ring arranged relative to the chuck body in a rotatable but axially immovable manner; a locking device comprising a coaxial gear ring with a locking groove and at least one locking member, the locking member being insertable or being inserted into the locking groove under the force of a locking spring; an adjusting sleeve capable of limited rotation between stops, the locking member being adjustable by rotation of the adjusting sleeve; and a locking mechanism forming two locking positions along the circumferential direction, wherein a shock-absorbing device is arranged between the adjusting sleeve and a component radially inwardly adjacent to the adjusting sleeve. Background Technology

[0002] This type of drill chuck is known from EP 0 710 518 A2, which specifically describes the structure of the locking device, consisting of a locking mechanism and a latching mechanism, and how the locking device works in conjunction with the various components. This drill chuck has proven to be excellent in practice, especially considering the increased power requirements of modern drilling rigs and the need to ensure that the lock remains closed even during impact drilling or extremely strong vibrations during auger operation. Sudden deceleration of the spindle should not release the lock when using the spindle stop mechanism. Summary of the Invention

[0003] Therefore, the objective of this invention is to further improve upon the proven and mature drill chucks of the type described at the beginning.

[0004] This task is solved by a drill chuck with the following features: a chuck body connectable to a drill spindle, in which jaws are arranged in guide receptacles extending inclined to the chuck axis, the jaws being adjustable for opening and closing via threaded rings arranged relative to the chuck body in a rotatable but axially immobile manner; a locking device consisting of a coaxial gear ring with a locking groove and at least one locking element, the locking element being inserted into the locking groove under the action of a locking spring; an adjusting sleeve capable of limited rotation between stops, the locking element being adjustable by rotation of the adjusting sleeve; and a locking device forming two locking positions in the circumferential direction, wherein a damping device for increasing the torque required to disable the locking device consisting of the locking device and the locking device is arranged between the adjusting sleeve and a component radially inwardly adjacent to the adjusting sleeve. An advantageous design with a suitable extended design of the present invention includes at least the following: the damping device is arranged between the adjusting sleeve and the intermediate sleeve; the damping device is arranged between the adjusting sleeve and the chuck body; the damping device is arranged in a groove extending circumferentially along the adjusting sleeve; the damping device is received in the groove spaced apart from the bottom of the groove; the damping device is arranged in the region of the largest diameter of the component radially adjacent to the adjusting sleeve; the damping device is formed of an elastic O-ring; the damping device is pre-tightened; the adjusting sleeve is formed of two parts, namely an outer metal operating sleeve and an inner plastic sleeve providing control cams and stops; the groove is constructed in the plastic sleeve.

[0005] By arranging damping devices between the adjusting sleeve and the component radially adjacent to the adjusting sleeve, the torque required to disable the locking device can be increased, so that the resulting vibration is insufficient to disengage the locking element from the locking teeth.

[0006] It is preferable that the damping device is arranged between the adjusting sleeve and the intermediate sleeve, because if the damping device is arranged between the adjusting sleeve and the chuck body, a greater torque will always be required to adjust the clamp and thus the achievable clamping force may be affected.

[0007] The damping device is suitably arranged in a groove extending along the circumference of the adjusting sleeve, wherein the damping device is accommodated in the groove spaced apart from the bottom of the groove.

[0008] When the damping device is arranged in the region of the largest diameter of the component adjacent to the radial direction of the adjusting sleeve, the installation of the drill chuck is simplified.

[0009] It has also been shown that the damping device is formed of a flexible O-ring, and thus can be pre-tightened in a slot suitable for this design in a simple manner by means of the extension of the radially built-in component.

[0010] The construction of the groove is particularly simplified when the adjusting sleeve is formed of two parts: an outer metal operating sleeve and an inner plastic sleeve that provides control cams and stops, with the groove constructed in the plastic sleeve.

[0011] The features and combinations of features previously mentioned in the specification, as well as those mentioned below in the description of the drawings and / or shown separately in the drawings, can be used not only in the described combinations, but also in other combinations or individually, without departing from the scope of the invention. Therefore, embodiments not explicitly shown or illustrated in the drawings, but which can be known and generated from the illustrated embodiments through separate combinations of features, are also considered to be included in and disclosed in the invention. Attached Figure Description

[0012] Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and with reference to the accompanying drawings.

[0013] Figure 1 A side view of the drill chuck is shown, presented as a longitudinal section in the left half;

[0014] Figure 2 It shows Figure 1 Section II-II;

[0015] Figure 3 It shows Figure 1 Section III-III; and

[0016] Figure 4 A longitudinal section of an insulated clamping sleeve with shock-absorbing devices is shown. Detailed Implementation

[0017] Depend on Figure 1As can be seen, the drill chuck 1 has a chuck body 2 that can be connected to the drill spindle. In the chuck body, a jaw 4 is arranged in a guide receiving portion 3 that extends inclined to the chuck axis. The jaw can be adjusted for opening and closing by a threaded ring 5 arranged relative to the chuck body 2 in a rotatable but axially immovable manner. To prevent undesirable adjustment of the jaw 4, the rotational position of the threaded ring 5 can be fixed. For this purpose, a locking device is constructed between the threaded ring 5 and the chuck body 2. The locking device consists of a toothed ring 6 coaxial with a locking groove on the side of the chuck body 2 and at least one locking member 7 on the side of the threaded ring 5. The locking member is engaged in the locking groove by the force of a locking spring 8. Here, the locking member 7 and the locking receiving portion that houses the locking member abut against each other's inclined side surfaces, such that these side surfaces lock the threaded ring 5 in the rotational direction corresponding to the open drill chuck 1 to prevent rotation. When the threaded ring 5 rotates, the locking member 7 is pressed out of the locking groove against the spring force by hand with a sufficiently large torque in the opposite rotational direction corresponding to the closed drill chuck 1, and can slide along the circumference of the drill chuck 2. The locking member 7 can be adjusted between its inserted and disengaged state in the locking groove. For this purpose, the locking member 7 can be adjusted by controlling the cam 19 at the coaxially fixed and axially immovable adjusting sleeve 9, and correspondingly, the adjusting sleeve 9 can rotate relative to the threaded ring 5. This rotation of the adjusting sleeve 9 relative to the threaded ring 5 is form-fitted and limited by the stop 21 in both rotational directions. By rotating the adjusting sleeve 9 in the rotational direction corresponding to the closed drill chuck 1, the locking member 7 is adjusted from the disengaged state to the inserted state, and vice versa. A locking device 22 is provided between the adjusting sleeve 9 and the threaded ring 5. This locking device has two locking positions 23 in the circumferential direction. The locking member 7 is in one locking position 23 when inserted into the locking groove and in the other locking position 23 when disengaged. The operation of this locking device is already well known in the technical community through EP 0 710 518 A2.

[0018] In the embodiment shown in the accompanying drawings, the threaded ring 5 is constructed as an unsplit threaded ring with an opening width greater than the diameter of the axially forward section of the chuck body 2. A locking sleeve 10 is torsionally and axially immovably fixed in the axially forward section of the chuck body 2. The locking sleeve carries the toothed ring 6 of the locking groove and serves to axially protect the threaded ring 5. However, the threaded ring 5 can also be designed as a split threaded ring with the toothed ring 6 of the locking groove directly constructed at the chuck body 2, as disclosed in EP 0 710 518 A2.

[0019] The locking sleeve 10 itself has a cylindrical front body section 11 and a rear tapered section 12, the rear tapered section being configured to abut against the axially forward annular flange 13 of the threaded ring 5. Furthermore, the locking sleeve 10 also has an intermediate section 14 extending parallel to the collet axis, which carries the toothed ring 6 of the locking groove and is connected to the front body section 11 and tapered section 12 via a section wing 15 extending parallel to the guide receiving portion 3.

[0020] Depend on Figure 1 As can be seen, a damping device 24 is arranged between the adjusting sleeve 9 and the component radially inwardly adjacent to this adjusting sleeve. In the illustrated embodiment, the damping device 24 is arranged between the adjusting sleeve 9 and the intermediate sleeve 18. The damping device 24 facilitates the suppression of vibration and prevents the locking from loosening or becoming difficult when the holding force of the locking spring 8 is less than the inertia of the adjusting sleeve 9, i.e., when a strong accelerating force is applied to the adjusting sleeve 9, for example, when using a spindle stop mechanism.

[0021] Another possibility is that the damping device 24 is arranged between the adjusting sleeve 9 and the chuck body 2.

[0022] Depend on Figure 1 and 4 As can be seen, the damping device 24 is arranged in a groove 20 extending along the circumferential direction of the adjusting sleeve 9, or more precisely, is accommodated in this groove spaced apart from the bottom of the groove 20. The damping device 24 is formed of an elastic O-ring, which is pre-tightened, and this is achieved and simplified by the corresponding shaping scheme of the groove 20. The damping device 24 itself is arranged in the region of the component radially inwardly adjacent to the adjusting sleeve 9, i.e., in the embodiment of the largest diameter of the intermediate sleeve 18.

[0023] When the adjusting sleeve 9 is formed of two parts, namely an external metal operating sleeve 16 for applying a large clamping force and an internal plastic sleeve 17 for providing control cam 19 and stop 21, then it is possible in a simple way that the groove 20 is also formed when the complex inner surface of the plastic sleeve 17 is formed.

[0024] List of reference numerals

[0025] 1. Drill chuck

[0026] 2. Chuck body

[0027] 3. Guide and receiving section

[0028] 4 grippers

[0029] 5. Threaded ring

[0030] 6 Gear Ring

[0031] 7 Locking components

[0032] 8 Locking Spring

[0033] 9. Adjusting sleeve

[0034] 10 Locking sleeve

[0035] 11. The main body section ahead

[0036] 12 Conical Sections

[0037] 13. Circular rolled edge

[0038] 14. Intermediate Section

[0039] 15th section flank

[0040] 16 Operating Sleeve

[0041] 17 Plastic sleeve

[0042] 18 Intermediate Sleeve

[0043] 19 Control Cam

[0044] 20 slots

[0045] 21 Stop

[0046] 22. Locking device

[0047] 23. Lock position

[0048] 24. Vibration damping devices

Claims

1. A drill chuck (1), comprising: a chuck body (2) connectable to a drill spindle, wherein jaws (4) are arranged in a guide housing (3) extending inclined to the chuck axis, the jaws being adjustable for opening and closing by a threaded ring (5) arranged relative to the chuck body (2) in a rotatable and axially immovable manner; a locking device comprising a toothed ring (6) coaxial with a locking groove and at least one locking element (7), the locking element being inserted into the locking groove under the action of a locking spring (8); an adjusting sleeve (9) rotatable between stops (21), the locking element (7) being adjustable by rotation of the adjusting sleeve; and a locking device (22) forming two locking positions (23) in the circumferential direction, characterized in that, A damping device (24) is arranged between the adjusting sleeve (9) and the component adjacent to the adjusting sleeve radially inward, for increasing the torque required to disable the locking device consisting of the locking device and the locking device (22).

2. The drill chuck (1) according to claim 1, characterized in that, The shock-absorbing device (24) is arranged between the adjusting sleeve (9) and the intermediate sleeve (18).

3. The drill chuck (1) according to claim 1, characterized in that, The shock-absorbing device (24) is arranged between the adjusting sleeve (9) and the chuck body (2).

4. The drill chuck (1) according to any one of claims 1 to 3, characterized in that, The shock-absorbing device (24) is arranged in a groove (20) extending along the circumferential direction of the adjusting sleeve (9).

5. The drill chuck (1) according to claim 4, characterized in that, The shock-absorbing device (24) is housed in the groove (20) at a distance from the bottom of the groove.

6. The drill chuck (1) according to any one of claims 1 to 3, characterized in that, The damping device (24) is arranged in the region of the largest diameter of the component that is radially adjacent to the adjusting sleeve (9).

7. The drill chuck (1) according to any one of claims 1 to 3, characterized in that, The damping device (24) is formed of an elastic O-ring.

8. The drill chuck (1) according to any one of claims 1 to 3, characterized in that, The shock absorber (24) is pre-tightened.

9. The drill chuck (1) according to claim 4, characterized in that, The adjusting sleeve (9) is formed by two parts: an outer metal operating sleeve (16) and an inner plastic sleeve (17) that provides control cam (19) and stop (21).

10. The drill chuck (1) according to claim 9, characterized in that, The groove (20) is constructed in the plastic sleeve (17).

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