EP3609653A1 - Drehschrauber - Google Patents
DrehschrauberInfo
- Publication number
- EP3609653A1 EP3609653A1 EP18717334.9A EP18717334A EP3609653A1 EP 3609653 A1 EP3609653 A1 EP 3609653A1 EP 18717334 A EP18717334 A EP 18717334A EP 3609653 A1 EP3609653 A1 EP 3609653A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- output shaft
- blocking
- locking device
- rotary joint
- shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- B25F5/02—Construction of casings, bodies or handles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
- B25B21/002—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose for special purposes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/0078—Reaction arms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
- B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers
Definitions
- the present invention relates to a screwdriver according to the preamble of claim 1.
- the drive part usually has a handle and a switching device.
- the screwdriver is held by the operator on the handle.
- the drive part and thus the handle are freely rotatable relative to the transmission part, so that the drive part after setting the rotary wrench on a screw connection is arbitrarily rotatable relative to the driven part.
- the drive part can be rotated after fitting the rotary wrench on a screw in an operating position in which the position of the drive member is comfortable for the operator.
- Such a screwdriver is known for example from DE 10 2013 218 190 AI of the applicant.
- the operator Due to the rotary joint between the output part and the drive part, the operator has to apply the torque occurring in the parting plane of the rotary joint during the screwing operation as a holding torque, which arises due to the counter-torque caused by the screw connection.
- the holding torque to be applied by the operator corresponds to the torque transmitted essentially from the drive part to the output part. For commonly used universal motors, this torque is approx. 2 Nm. Such a torque is easy to hold by an operator. In a drive member having a drive device with a higher torque, the application of the necessary holding torque can lead to significant loads on the operator and can pose a security risk.
- the screwdriver according to the invention is defined by the features of claim 1.
- the screwdriver according to the invention has a drive device having a drive part and a transmission part, wherein the transmission part transmits a rotational movement of the drive device to an output shaft.
- the drive part is via a swivel joint with the Transmission part connected, wherein the drive part via the rotary joint is rotatable relative to the transmission part.
- the rotary joint has a locking device, via which the rotary joint can be blocked, as well as an input shaft socket and an output shaft.
- the locking device comprises an actuating element which connects the input shaft stub to the output shaft, wherein when a threshold value of a counter-torque applied to the output shaft is exceeded, the actuating element actuates the locking device for blocking.
- the locking device comprises an actuator which connects the input shaft stub to the output shaft. When carrying out the screwing is produced on the output shaft caused by the screw counter-torque, which is transmitted from the output shaft via the transmission part to the output shaft.
- the actuating element When a threshold value of the counter torque, which is transmitted to the output shaft, is exceeded, the actuating element actuates the locking device for blocking the rotary joint. In the present invention, therefore, the blocking of the rotary joint via the locking device takes place automatically from a certain counter torque.
- the actuating element as a connection between the input shaft stub and the drive shaft, for example, a slight rotation between the output shaft and the input shaft stub can be used when exceeding the threshold of the counter-torque applied to the output shaft for the actuation of the locking device in an advantageous manner.
- the screwdriver according to the invention has the particular advantage that the locking device is automatically actuated when the threshold value of the counter torque is exceeded. As a result, operating errors are avoided and the screwdriver according to the invention is particularly comfortable and safe to use for the operator.
- the locking device comprises a spring element, wherein the actuating element actuates the locking device for blocking against a restoring force of the spring element.
- a threshold value of the counter torque can therefore be adjusted in an advantageous manner, and it is prevented that the locking device is already actuated during the rotation of the drive part relative to the transmission part for setting the operating position.
- the threshold value of the counter torque is further determined by the prevailing friction forces in the locking device.
- the spring element can also operate the locking device falls below a threshold value of the voltage applied to the output shaft counter torque in the release position. For this purpose, for example, the actuating element can be returned via the spring element.
- the locking device comprises a holding element and a blocking element, wherein the blocking element during blocking the rotary joint engages positively in the retaining element.
- a positive connection of the blocking element with the holding element for blocking the pivot joint a particularly advantageous and stable blocking of the rotary joint is possible.
- a frictional connection between the holding element and blocking element is possible.
- the actuating device for blocking the adjusting device adjusts the blocking element and the holding element in the axial direction of the rotary joint to each other.
- the actuator may displace the blocking element to block the adjusting device.
- the blocking element may, for example, be non-rotatably connected to a first part of the rotary element and the holding element to be rotatably connected to a second part of the rotary joint.
- the actuating element is designed as a shaft element, wherein the input shaft stub and the output shaft radially support the shaft element, wherein preferably the input shaft stub and / or the output shaft of the shaft member shifts in the axial direction when the threshold value of the applied counter torque on the output shaft is exceeded.
- the actuator is thus feasible in a structurally simple way. Furthermore, a usable for the actuation of the locking device movement of the actuating element is generated in a simple manner by this is moved when exceeding the threshold value in the axial direction.
- the input shaft stub is connected via at least one first pin to the shaft member for transmitting a torque and the output shaft is connected via at least one second pin to the shaft member for transmitting a torque, wherein the first pin in a first slot and the second pin is guided in a second slot and wherein the first and / or the second slot in the axial direction of the rotary joint has a slope.
- both slots can have a slope.
- connection of one of the pins with a slot with pitch is also a threaded connection, which is preferably not self-locking, possible.
- a pitch having a slot may be provided instead of the connection between the pin and the other slot and a splined connection.
- the actuating element is designed as a hollow shaft and the input shaft socket and the output shaft are inserted into the actuating element.
- the actuator in the form of a shaft member is thus formed as a kind of sleeve which connects the input shaft stub and the output shaft.
- Such an embodiment of the actuating element has proven to be particularly advantageous because a connection to the input shaft socket and the output shaft can be made possible in a simple manner and beyond that the input shaft stub and drive shaft can be designed as solid waves and thus very stable.
- the confirmation element identifies a circumferential projection which displaces the blocking element.
- the projection allows in a structurally simple manner an actuating part of the actuating element, with which the actuating element can act on the blocking element.
- the blocking element and the retaining element each have a crown wheel shape, wherein preferably between the actuating element and the blocking element, a thrust bearing is arranged.
- the thrust bearing may for example be arranged between the circumferential projection and the blocking element.
- the adjusting device is possible by such an embodiment of the invention. Since the actuator is connected to the input shaft stub and the output shaft, this rotates with the screwing operation with the input shaft stub and the output shaft. Via the axial bearing can thus be achieved that the actuating element can permanently abut the blocking element and thus always an operation is possible without it may come to excessive wear due to the relative movement between the actuating element and the blocking element.
- the spring element is arranged between the blocking element and the holding element.
- the blocking element is pushed away during the release of the locking device of the retaining element and thus moved out of engagement with the retaining element.
- the first pin is designed as a pin which engages in the input shaft socket and / or that the second pin is designed as a pin which engages in the output shaft.
- Such a configuration allows a structurally simple connection between the input shaft socket and the output shaft and actuator by the trained as a bolt first or second pin is inserted into the input shaft socket or the output shaft and engages in the actuator, for example, in the corresponding slot of the actuator.
- the oblong slot of the actuating element can also have the shape of a polygon, so that two or more flanks are formed with slope, at which the corresponding pin or bolt is guided along to cause the actuating movement.
- the actuating element can actuate the locking device upon rotation in both possible directions of rotation.
- the blocking element is mounted on a sliding bearing.
- the sliding bearing may for example consist of rods which engage in one of the parts of the rotary joint.
- the blocking element can also consist of a guide part with a plurality of balls which are mounted on the guide part, wherein the holding element has a plurality of recesses adapted to the balls.
- the balls can be advantageously produce a positive connection between the blocking element and retaining element by the balls engage in the recess in the retaining element.
- the balls mounted in the guide part make it possible, in the release position of the rotary joint of the blocking element, to slide over the retaining element by rolling the balls on the retaining element.
- the number of depressions in the holding element can be substantially greater than the number of balls of the guide part.
- the balls can be pressed into the recesses for blocking the locking device, so that it comes to the positive connection between the blocking element and retaining element.
- the actuating element has a truncated cone shape over which the balls are pressed in the radial direction for blocking.
- the screwdriver according to the invention can be used in particular a drive device, which applies compared to the commonly used universal motors, a much higher torque.
- a commercially available cordless drill driver is used as a driving part of the rotary screwdriver according to the invention, for example, generates a torque of up to 60 Nm and more.
- the screwdriver according to the invention can be used in a pleasant manner for the operator, while at the same time ensuring a high level of safety for the operator during the screwdriving process with the screwdriver according to the invention.
- a support foot is provided, via which the transmission part and thus the screwdriver can be supported on a stationary abutment.
- the drive device is designed as an electric motor.
- the drive device can be designed as a pressure medium-operated motor, for example as a pneumatic or hydraulic motor.
- the electric motor is designed as a universal motor or as a DC motor.
- the drive part may have an energy store for electrical energy for supplying the electric motor, for example an accumulator. In this way, independent of a power grid use of the rotary wrench is possible.
- the hinge consists of a first flange, which with the drive part is connected and from a second flange which is connected to the transmission part, wherein the first and the second flange are rotatably connected via a rotary bearing.
- the first flange for example, the first part of the rotary joint, which is rotatably connected to the blocking element form, and he second flange of the second part of the rotary joint, which is rotatably connected to the holding element.
- Such a hinge can be realized in a structurally simple manner, at the same time a connection of the rotary joint with the drive part and the transmission part is possible in an advantageous manner.
- the invention further provides a method for performing a screwing operation with a preferably inventive screwdriver having a drive device having a drive part and a transmission part, wherein the transmission part transmits a rotational movement of the drive device to an output shaft and the drive part is connected via a rotary joint with the transmission part, and wherein the rotary joint (5) has a locking device (19), via which the rotary joint (5) can be blocked, with the following steps: a) placing the rotary wrench on a screw connection b) positioning the drive part in an operating position
- Fig. 1 is a schematic side view of an inventive
- Fig. 2 is a schematic sectional view of the rotary joint of a rotary wrench according to the invention.
- Fig. 3 is a schematic exploded view of
- Fig. 1 shows a screwdriver schematically in a side view.
- the screwdriver 1 has a drive part 3, which has a drive device, for example an electric motor.
- the drive part 3 is connected via a rotary joint 5 with a transmission part 7.
- the transmission part 7 has a torque converter, for example a planetary gear, and an output shaft 9. On the output shaft 9, for example, a key nut can be placed.
- the drive part 3 has an energy store 11 for electrical energy, for example an accumulator, which supplies the drive device designed as an electric motor with electrical energy.
- the rotary wrench 1 according to the invention is operated independently of a power grid.
- the drive device is adjustable.
- the drive part 3 has a handle 15, over which the operator can hold the screwdriver 1.
- the torque converter of the transmission part 7 is amplified by the torque generated by the drive device of the drive part 3 and then transmitted to the output shaft 9. Furthermore, the transmission part 7 has a support leg 17, via which the transmission part 7 and Thus, the screwdriver 1 can be supported during operation against a stationary abutment, not shown.
- the drive part 3 is rotatably connected to the transmission part 7.
- the screwdriver 1 can advantageously be placed on a screw, wherein the drive part 3 then in an operating position, which is convenient and safe for the operator, can be rotated. It is also possible to put the screwdriver 1 on a screw and then to operate the drive device.
- the transmission part 7 can rotate freely relative to the drive part 3 due to the rotary joint 5. When switching on the drive part, the transmission part thus rotates about its longitudinal axis and pivots the support leg 17 slowly until it hits against a stationary abutment.
- the rotary joint 5 has a locking device 19, which is explained in more detail in FIG. 2, via which the rotary joint 5 can be blocked. This can prevent the torque in the division plane of the swivel joint 5 from being transmitted to the operator.
- the hinge 5 is shown schematically in the sectional view.
- the hinge 5 consists of a first flange 21 which is rotatably connected to the drive part 3.
- the drive part 3 is designed as a commercial battery-operated drill.
- a receiving opening 23 is provided into which the driving part 3 can be inserted.
- the first flange 21 is connected to a second flange 27.
- the second flange 27 is rotatably connected to the transmission part 7.
- the first flange 21 has an input shaft socket 29, which is connectable to the output of the drive part 3.
- the input shaft stub 29 is supported in the first flange 21.
- the rotary joint 5 also has, on the output side, an output shaft 31 for connection to the torque converter of the transmission part 7.
- the output shaft 31 is mounted in the second flange 27.
- the locking device 19 is arranged between the first flange 21 and the second flange 27, the locking device 19 is arranged.
- This consists of a holding element 35 which is rotatably connected to the first flange 21 and a blocking element 37 which is rotatably connected to the second flange 27.
- the holding element 35 is fastened to the first flange 21 via a screw connection 35a.
- a bearing 39 for the rotary mounting of the input shaft stub 29 is arranged in the holding element 35.
- the holding element 35 and the blocking element 37 have a crown wheel shape, wherein the holding element 35 on the blocking element 37 side facing first projections 35b and the blocking element 37 on the holding element 35 side facing second projections 37b.
- the first and second projections 35b, 37b can engage in one another and form a positive connection between the blocking element 37 and the holding element 35.
- the blocking element 37 is mounted on the second flange 27 via a sliding bearing 41.
- the sliding bearing 41 allows movement of the blocking element 37 in the axial direction of the rotary joint and is formed by rods 41 a, which are received in bores 41 b.
- the locking device 19 also has an actuating element 45.
- the actuator 45 connects the input shaft stub 29 and the output shaft 31.
- the actuator 45 is formed as a shaft member in the form of a hollow shaft.
- the input shaft stub 29 engages on the one side in the actuating element 45 and is connected by means of a first pin 47, which is designed as a bolt with the actuating element 45.
- the output shaft 31 engages on the other side in the actuator 45 a and is connected to the actuator 45 with a second pin 49 in the form of a bolt.
- Fig. 3 schematically in an exploded view.
- the first bolt is inserted into a through-hole 29 a in the input shaft stub 29 and engages in first elongated holes 47 a in the operating member 45.
- the second pin 49 is guided through a through hole 31 a in the output shaft 31 and engages in second slots 49 a in the actuating element 45 a.
- the second slots 49a are formed as a polygon.
- the flanks of the second elongated hole 49a have a pitch in the axial direction of the rotary joint, whereby a relative rotation between the input shaft socket 29 and the output shaft 31 is made possible by a small angle of about 10 °.
- the rotation between the input shaft socket 29 and the output shaft 31 can occur.
- the second pin 49 slides along some of the flanks of the slots 49a.
- the actuating element 45 is displaced in the axial direction of the rotary joint 5. This movement is permitted by the first slot 47a without having to move the input shaft stub 29 in the axial direction.
- the configuration of the oblong holes 49a in polygonal shape has the advantage that the locking device 19 functions in both directions of rotation of the input shaft stub 29 and thus the rotary screwdriver according to the invention can also be used in screw connections with left-hand threads.
- the operating member 45 has a circumferential projection 45a, in the axial movement of the operating member 45, the operating member 45 presses with the circumferential projection 45a against the blocking member 37 and moves it in the axial direction to engage in the holding member 35. Since the actuator 45 together with the Input shaft stub 29 and the output shaft 31 continue to exert a rotational movement and the blocking member 37 rotatably connected to the second flange 27, between the projection 45 a and the blocking member 37, a thrust bearing 51 is arranged, which allows a rotational movement between the projection 45 a and the blocking member 37.
- a spring element 53 is further arranged between the blocking element 37 and the holding element 35.
- the blocking element 37 is thus movable only against the spring force of the spring element 53 in the blocking position. This has the advantage that when falling below a threshold value of the voltage applied to the output shaft 31 counter torque of the blocking element 37 is automatically pressed by the spring element 53in the release position, so that the locking device 19 and thus the hinge 5 is released.
- the spring force of the spring element 53 and the frictional forces generated in the locking device 19, in particular the frictional forces between the second pin 49 and the second slot 49a determine the magnitude of the threshold value of the counter torque in which the locking device 19 is confirmed or released.
- the rotary wrench 1 can be used in the following manner. First, the screwdriver 1 is mounted by means of a key nut attached to the output shaft 9 to a screw connection. Subsequently, the drive part 3 is positioned in an operating position by rotating relative to the transmission part 7. When Verschraubungsvorgang the locking device 19 of the rotary joint 5 is automatically blocked via the actuator 45, as soon as a caused by the screw counter-torque of certain size is caused on the output shaft 9.
- the transmission part 7 can be set with the support leg 17 against an abutment, so that a support of the rotary wrench 1 can be carried out.
- the screwdriver 1 according to the invention can of course also be operated with a network-connected drive part instead of a battery-powered drive part.
- a network-connected drive part instead of a battery-powered drive part.
- fluid-operated drive parts such as pneumatically or hydraulically operated drive parts can be used.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017206337.8A DE102017206337A1 (de) | 2017-04-12 | 2017-04-12 | Drehschrauber |
| PCT/EP2018/059144 WO2018189168A1 (de) | 2017-04-12 | 2018-04-10 | Drehschrauber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3609653A1 true EP3609653A1 (de) | 2020-02-19 |
| EP3609653B1 EP3609653B1 (de) | 2021-11-24 |
Family
ID=61965994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18717334.9A Active EP3609653B1 (de) | 2017-04-12 | 2018-04-10 | Drehschrauber |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP3609653B1 (de) |
| DE (2) | DE102017206337A1 (de) |
| DK (1) | DK3609653T3 (de) |
| ES (1) | ES2909142T3 (de) |
| WO (1) | WO2018189168A1 (de) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013218190A1 (de) | 2013-09-11 | 2015-03-12 | Wagner Vermögensverwaltungs-GmbH & Co. KG | Drehschrauber sowie Verfahren zum Durchführen eines Schraubvorgangs mit einem Drehschrauber |
| DE102015111570A1 (de) | 2015-07-16 | 2017-01-19 | Jörg Hohmann | Drehschrauber |
-
2017
- 2017-04-12 DE DE102017206337.8A patent/DE102017206337A1/de not_active Withdrawn
-
2018
- 2018-04-10 DK DK18717334.9T patent/DK3609653T3/da active
- 2018-04-10 EP EP18717334.9A patent/EP3609653B1/de active Active
- 2018-04-10 WO PCT/EP2018/059144 patent/WO2018189168A1/de not_active Ceased
- 2018-04-10 ES ES18717334T patent/ES2909142T3/es active Active
- 2018-04-10 DE DE202018006096.8U patent/DE202018006096U1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DK3609653T3 (da) | 2022-02-28 |
| DE202018006096U1 (de) | 2019-03-17 |
| DE102017206337A1 (de) | 2018-10-18 |
| WO2018189168A1 (de) | 2018-10-18 |
| EP3609653B1 (de) | 2021-11-24 |
| ES2909142T3 (es) | 2022-05-05 |
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