Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
  • B23B31/02—Chucks
  • B23B31/08—Chucks holding tools yieldably

Definitions

• the invention relates to a device for screwing in self-drilling fasteners, which on the one hand can be mounted on a drive arrangement and on the other hand is designed for the form-fitting mounting of a drive section of a self-drilling fastener.
• a number of devices which can be mounted as attachments to a drive arrangement and are designed to receive a drill or a self-drilling fastener so that they can be screwed into a corresponding workpiece.
• self-drilling fasteners it is relatively often the case that the drill tip is not exactly aligned with the fastener axis, so that when self-drilling fasteners are screwed in, vibrations and impacts occur on the device itself and thus also on the drive arrangement.
• the result is a generally non-circular hole.
• this also has a negative effect on the device and the drive arrangement itself over time.
• the present invention has therefore set itself the task of creating a device with which vibration-free, dimensionally accurate bores can be produced with the self-drilling fastener inserted even if the drilling tip does not exactly match the fastener axis.
• an at least angularly movable coupling is provided between a component which can be mounted on a drive arrangement and a component which receives the drive section of a self-drilling fastener or engages in it. It has been shown that a vibration-free device and thus a vibration-free drilling can be achieved with the design according to the invention, the drilling properties and the drilling times can be significantly improved. A possible eccentricity of the drill tip with respect to the fastener axis is thus eliminated, which is particularly advantageous with self-drilling fasteners.
• a number of compensating clutches and angularly movable couplings have become known in the art, but have hitherto only been used for the purpose, for example, of compensating for inaccuracies in the manufacture of machines or of a larger range of motion to compensate for noticeable tolerances and changes in position of shafts create.
• a kind of tumbling device for screwing in self-drilling fasteners is did not suggest compensating couplings or angularly movable couplings.
• Couplings which can be moved at an angle have hitherto only been used for transmitting motion between shafts which are inclined at a certain angle to one another.
• an angularly movable coupling is generally sufficient. If, on the other hand, larger deviations in inclination can also occur at high torques, it is proposed that the angularly movable coupling be used as an articulated coupling, e.g. is designed as a universal or ball joint coupling or spring coupling.
• a special embodiment of the invention is that the angularly movable coupling as a sleeve coupling with flexible sleeve material, e.g. in the form of rubber, plastic or spring bellows. This is a very simple constructional embodiment.
• the angularly movable coupling is designed as a tooth or claw coupling. Even with such an arrangement, the mechanical transmission of the torque is ensured in a flawless manner, and nevertheless an angle compensation between the central axes of the two components of the device is possible in order to compensate for any inaccuracies in the drill tip.
• the two components engage in the manner of a plug-in connection coaxially with play for the angular mobility and are coupled via a radially inserted pin for the mutual rotation.
• the push-through opening for this pin is designed as a snug fit in one component and in the other component for effecting the angular mobility with a larger diameter than the pin, then on the one hand the rotational driving is ensured and on the other hand the required angular mobility between the two components is created, which is necessary for the correct screwing in of self-drilling fasteners.
• the angularly movable coupling is formed between a component coupled to the drive arrangement and the drive section of the self-drilling fastener.
• the fastener itself or its drive section is, as it were, wobbling, that is to say angularly movable, in the component coupled to the drive arrangement.
• the angularly movable mounting of the drive section of the self-drilling fastener alone creates a proper compensation, which enables vibration-free drilling. This very simple construction alone creates the possibility of drilling an exactly round hole even with an eccentric drill tip, with no vibrations being transmitted to the drive arrangement itself.
• the component which can be coupled to the drive arrangement has a receiving opening for the latter which is enlarged compared to the cross section of the drive section of the self-drilling fastener. points and mutually engaging means are provided for driving the self-drilling fastener. It is therefore only necessary to provide a correspondingly larger receiving opening in which the drive section of the self-drilling fastener is held, so to speak, to wobble, in order to achieve the necessary compensation.
• the drive section of the self-drilling fastener has a boizen-shaped design with at least one radially projecting area designed as a driving element and in the side wall of the receiving opening in the component receiving the drive section at least one groove, a slot or the like for engaging the Areas of the drive section designed as driving elements are provided.
• FIG. 1 shows a side view of a device fastened to a drive arrangement with an inserted self-drilling fastener
• FIG. 2 shows an enlarged representation of the device compared to FIG. 1 in a longitudinal section, the central axes of the two components being matched to one another;
• FIG. 3 is a bottom view according to FIG. 2;
• FIG. 4 likewise shows a longitudinal section of the device according to FIG. 2, the maximum angular deflection between the two components being shown;
• FIG. 5 and 6 show two views of a self-drilling fastener as used for the drilling process according to FIG. 1;
• Fig. 7 is a front view of another embodiment of the device and
• Figure 8 is a bottom view of this device
• Fig. 10 is a side view of the device of Fig. 7 and
• Fig. 1 1 is a bottom view in the position rotated by 90 ° compared to Fig. 8;
• FIG. 12 shows the fastener according to FIG. 9 in a side view
• Fig. 13 shows a device according to FIGS. 7 and 10 with inserted fastener in a longitudinal section.
• the device 1 essentially consists of the two components 2 and 3, the component 2 being connected to a drive arrangement 4, e.g. a drilling machine can be attached.
• a drive arrangement 4 e.g. a drilling machine can be attached.
• the component 2 has an internal thread 24, which can be screwed onto a rivet mandrel of the drive unit 3.
• component 2 has a key attack surface 25.
• Component 3 serves to receive a self-drilling fastener 7, which in the present case is designed as a self-drilling blind rivet.
• An angularly movable coupling is provided between the component 2 which can be mounted on the drive arrangement 4 and the component 3 which receives the drive section of the self-drilling fastener 7.
• the two components 2 and 3 thus interlock positively with one another for mutual rotational driving and are angularly movable relative to one another.
• the components 2 and 3 engage in one another coaxially with play in the manner of a plug connection and are coupled to one another via a radially inserted pin 9 for mutual rotational driving.
• the push-through opening 8 'for the pin 9 is in the pin-like extension 18 of the Component 3 provided and designed as a snug fit for the pin 9, whereas the push-through opening 8 in the sleeve-shaped part 17 of the component 2 is designed with a larger diameter or larger dimensions than the pin 9.
• the component 3 is formed at its free end for receiving the drive section of the self-drilling fastener 7, so that the fastener 7 can be held securely and the torque required for the drilling process must also be transmitted.
• a self-drilling fastener 7 in the form of a self-drilling blind rivet is to be screwed in, then on the one hand the possibility must be created to provide a receiving opening 20 for the rivet mandrel 15 for axial guidance, and on the other hand the rotational driving must be provided.
• the rivet mandrel 15 is flattened in the region 16 and pressed outwards in the radial direction, the regions thereby protruding beyond the diameter of the rivet mandrel 15 into lateral grooves 21 which engage connect the receiving opening 20 in component 3, can intervene.
• the free end region of the component 3 is covered by a pot-like part 22, the region of the part 22 adjoining the receiving opening 20 being designed such that the head 14 of the fastener, in the present case the flange of a rivet sleeve 12, can be supported .
• a metal ring 23, which presses the part 22 against the component 3, is drawn on to hold the part 22 in a force-locking manner.
• the section 19 of the component 3 can, of course, be designed to accommodate another self-drilling fastener in a wide variety of ways. It would also be conceivable to provide additional brackets, which are advantageous, for example, if correspondingly long screws are to be held.
• 5 and 6 which is also used in the example of FIG. 1, a spreading part 13 is arranged at the other end of the rivet mandrel 15, which when the rivet mandrel 15 is pulled out, the rivet sleeve 12 on the back of the workpieces 5 and 6 expands.
• This expansion part 13 also carries the drilling plate 11 provided here or a corresponding other drilling tip.
• the device according to the invention can now compensate, so that perfect, vibration-free drilling and the production of an exact hole are possible.
• the angularly movable coupling was formed by a pin inserted into one component 3, which engages in a larger opening 8 of the other component.
• Various technical measures are conceivable for forming an angularly movable coupling, the selection of which is left to the person skilled in the art. It would also be conceivable to design the angularly movable coupling at the same time as a compensating coupling for axial and / or radial compensation, in particular if the angular deviations are to be taken into account to a greater extent. In terms of design, it would also be conceivable to use the angularly movable coupling as a sleeve coupling with flexible sleeve material, e.g. in the form of rubber, plastic or spring bellows. Training as a tooth or claw coupling would also be conceivable.
• two components are not provided, as in the embodiment according to FIGS. 1 to 6, in order to form the angularly movable coupling.
• Only a single component 2 is provided here, which can be mounted on the drive arrangement, that is, for example, can be inserted into the clamping jaws of a drill chuck. With this arrangement, the angularly movable coupling is practically produced between this component 2 and the drive section of the fastener. The fastener or its drive section is thus held in the component 2 such that it can move in an angular manner, that is to say it is used in a somewhat tumbling manner and without a firm hold.
• the component 2 that can be coupled to the drive arrangement has a receiving opening 20, the cross section of which is larger than the diameter of the drive section of the self-drilling fastener, this drive section being formed here by the mandrel of a blind rivet fastener.
• a rivet mandrel 15 which, as shown in FIGS. 5 and 6, is provided with a thread.
• the rivet sleeve is not shown.
• areas 16 designed as entrainment elements are also provided, which can engage in grooves 21 formed in the side wall of the receiving opening 20. This ensures the required rotational driving for the drilling process, the fastener or its drive section being nevertheless angularly movable with respect to the component 2 by the receiving opening 20 having a larger diameter. This can be seen from FIG. 13.
• component 2 and the type of driving elements can be done in different ways.
• the form shown is therefore only an exemplary embodiment.
• only one groove could also be provided, or slots or other openings could also be formed.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Dowels (AREA)
• Drilling Tools (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6409688

Family Applications (1)

Country Status (3)

Cited By (1)

Citations (6)

Family Cites Families (12)

• 1990
  • 1990-07-05 DE DE19904021378 patent/DE4021378A1/de active Granted
• 1991
  • 1991-07-02 WO PCT/EP1991/001231 patent/WO1992000824A1/de unknown
  • 1991-07-02 AU AU80087/91A patent/AU8008791A/en not_active Abandoned

Patent Citations (6)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events