EP4230326A1 - Outil électrique pour poser des éléments de fixation - Google Patents

Outil électrique pour poser des éléments de fixation Download PDF

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Publication number
EP4230326A1
EP4230326A1 EP23151315.1A EP23151315A EP4230326A1 EP 4230326 A1 EP4230326 A1 EP 4230326A1 EP 23151315 A EP23151315 A EP 23151315A EP 4230326 A1 EP4230326 A1 EP 4230326A1
Authority
EP
European Patent Office
Prior art keywords
axis
motor
power tool
tool
gripping portion
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.)
Pending
Application number
EP23151315.1A
Other languages
German (de)
English (en)
Inventor
Yasar AKBABA
Philipp Libera
Benjamin Schmidt
Tobias Heep
Arthur Lauer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Black and Decker Inc
Original Assignee
Black and Decker Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from GBGB2202371.7A external-priority patent/GB202202371D0/en
Application filed by Black and Decker Inc filed Critical Black and Decker Inc
Publication of EP4230326A1 publication Critical patent/EP4230326A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/10—Riveting machines
    • B21J15/105—Portable riveters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/02—Riveting procedures
    • B21J15/04—Riveting hollow rivets mechanically
    • B21J15/043—Riveting hollow rivets mechanically by pulling a mandrel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/10—Riveting machines
    • B21J15/16—Drives for riveting machines; Transmission means therefor
    • B21J15/26—Drives for riveting machines; Transmission means therefor operated by rotary drive, e.g. by electric motor

Definitions

  • This specification relates to a power tool for setting fasteners.
  • Some existing blind rivet setting tools have a ball screw mechanism driven by an electric motor for causing movement of a set of jaws in order to pull the mandrel of a rivet.
  • a ball screw mechanism driven by an electric motor for causing movement of a set of jaws in order to pull the mandrel of a rivet.
  • Such a tool is described in EP3530372A2 for example, wherein the motor is located above the handle.
  • the manufacturer needs to carefully consider the arrangement of features within the housing relative to the handle. Having the motor and all transmission features above the handle makes the tool top heavy. Also due to space limitations within the housing there is some play off between arranging internal features of the tool such that the tool works vs. arranging such features so that weight distribution of the tool is optimised.
  • a power tool comprising: a motor at least partially located within the handle of the tool and having a motor output shaft extending along a first axis extending along the length of the handle; and a fastener gripping portion operatively coupled to the motor via a transmission which in use causes movement of the fastener gripping portion along a second axis, perpendicular to the first axis, between a home position and a retracted position to set a fastener engaged by the fastener gripping portion; the transmission comprising a bevel gear arrangement for redirecting torque flowing along the first axis in use which is input to the bevel gear arrangement so that torque output from the bevel gear arrangement flows along the second axis and wherein the transmission further comprises a mechanism for converting torque output from the bevel gear arrangement in use into a linear force for causing linear movement of the fastener gripping portion.
  • the mechanism may be a ball screw mechanism extending along the second axis between the bevel gear arrangement and the fastener gripping portion.
  • the mechanism may be a roller screw mechanism extending along the second axis between the bevel gear arrangement and the fastener gripping portion.
  • the motor may be located entirely within the handle.
  • the transmission may comprise at least one planetary gear stage for transferring torque from the motor along the first axis in use.
  • the at least one planetary gear stage may be at least partially located within the handle, optionally entirely located within the handle.
  • the power tool may comprise a battery attachment portion on the handle such that a notional line extending between the battery attachment portion and the motor output shaft extends along the first axis.
  • the motor may be a brushless DC motor.
  • the fastener gripping portion may be a jaw assembly.
  • the power tool may be a blind rivet setting tool.
  • Fig. 1 shows a side cross-sectional view of a blind rivet setting tool 100.
  • the tool 100 has a housing 102 of a clam shell type construction having two halves which are fastened together.
  • a battery 104 is releasably connected to the base 122 of the handle 106 via a battery attachment feature.
  • a user inserts the mandrel of a blind rivet into a nose 108 of the tool 100 and pulls a trigger 110.
  • the controller 112 In response to a controller 112 of the tool determining that the trigger 110 has been pulled the controller 112 generates a signal to activate a motor 114, which is a DC brushless motor.
  • the motor 114 is located in the handle 106 and has a motor output shaft 116.
  • Torque from the motor output shaft 116 is transferred via a transmission 118 to a first bevel gear 120.
  • the transmission 118 comprises at least one planetary gear arrangement for reducing output speed while increasing torque.
  • the first bevel gear 120 rotates at a lower speed than the motor output shaft 116 however with an increased torque relative to the motor output shaft 116.
  • the motor output shaft 116, transmission 118 and first bevel gear 120 are aligned along a first axis A-A which extends along a longitudinal length of the handle 106. By also locating the battery 104 on the first longitudinal axis A-A weight distribution of the tool 100 is improved.
  • planetary gear stages step down rotation speed while stepping up torque persons skilled in the art, based on the disclosure given herein, will be able to decide upon a suitable transmission arrangement which achives the required gear ratio for thier tool to function; wherein the appropriate gear ratio depends on multiple factors including maximum achieveble motor output torque, pitch of the ball screw arrangement 130 described below, friction between moveable featiures within the tool 100 and the maximum pull force required to set a fastener.
  • a suitable transmisison 118 may only have a single planetary gear stage, whereas for other tools a suitable transmisison 118 may have a plurality of planetary gear stages arranged in series.
  • a second bevel gear 124 is provided on the end face of a driving sleeve 126.
  • the driving sleeve 126 is rotationally fixed relative to an input sleeve 128 of a ball screw arrangement 130.
  • the driving sleeve 126 and input sleeve 128 are fixed relative to each other due to a friction fit arrangement.
  • An internal surface of the input sleeve 128 comprises a threaded surface.
  • the outer surface of the driving sleeve 126 is supported by bearings 132 which enable rotation of the driving sleeve 126 with respect to the housing 102.
  • a threaded rod 134 is mounted within the input sleeve 128, which extends through the input sleeve 128.
  • a plurality of balls such as metal ball bearings, ride in the opposing threaded surfaces of the input sleeve 128 and threaded rod 134, thereby defining a ball screw arrangement 130.
  • the threaded rod 134 is configured to move along a second longitudinal axis B-B of the tool 100.
  • the threaded rod 134 can move forwards or backwards along the axis B-B depending on the motor driving direction.
  • a connecting sleeve 300 is attached to a first end 302 of the threaded rod 134, which is mounted to the threaded rod 134 via a screw thread.
  • a pull-back hull 304 is threadably attached to the connecting sleeve 300. Axial movement of the threaded rod 134 along the second longitudinal axis B-B therefore also causes axial movement of the pull-back hull 304.
  • a jaw assembly 500 is located within the pull-back hull 304.
  • the jaw assembly (shown in Fig. 3a ) has a plurality of circumferentially arranged jaws 306 each of which has a ramped outer surface 308 for cooperating with a conical inner surface 310 of the pull-back hull 304.
  • a separator sleeve 312 is forced by a spring 314 against the jaws 306; more specifically a ramped front surface 316 of the separator sleeve 312 is forced against ramped rear surfaces 318 of the jaws 306.
  • a nosepiece 320 is releasably attached at the opening to the nose 108 of the tool 100 which has an annular ramped surface 402.
  • Each of the jaws 306 have a front ramped surface 400 for cooperating with the annular ramped surface 402 of the nose piece 320.
  • Cooperation between the ramped outer surfaces 308 of the jaws 306 and the conical inner surface 310 of the pull-back hull 304, between the ramped rear surfaces 318 of the jaws 306 and the ramped front surface 316 of the separator sleeve 312 and between the front ramped surfaces 400 of the jaws and the annular ramped surface 402 of the nose piece 320 enables the tool 100 to set blind rivets in use.
  • a mandrel of the blind rivet is inserted through the nose piece 320 such that the mandrel extends between the jaws 306, thereby urging the jaws 306 radially apart (see Fig. 3b ).
  • the controller 112 receives output from a trigger sensor and in response activates the motor 114 for causing the threaded rod 134, and thus the pull-back hull 304, to move along the second longitudinal axis B-B to the right in Figs. 1 and 2 .
  • Designers are free to select a suitable way for the controller 112 to control operation of the motor 114 in use to implement a fastening operation. In other words designers are free to select a suitable way for the controller 112 to determine when the jaw assembly 500 has been retracted far enough during a fastener setting stage of operation at which point in time retraction of the jaw assembly 500 is ceased.
  • a mechanical switch may be provided within the tool 100 and in response to the controller 112 determining that the trigger 110 has been pulled by a user the controller 112 causes the pull-back hull 304 (and thus the jaw assembly 500) to be retracted until a feature of the pull-back hull 304 actuates the mechanical swich thereby generating output indicative that the jaw assembly 500 has been pulled back sufficiently far to set a blind rivet.
  • an optical sensor may be provided within the tool 100 which generates output based on the presence or absence of a feature on the pull-back hull 304 wherein based on output from the optical sensor the controller 112 can determine that the pull-back hull 304 (and thus the jaw assembly 500) has reached a predetermined retracted position for setting a blind rivet.
  • the controller 112 may be configured to monitor the magnitude of current drawn from the battery 104 during a fastening operation and when the current draw drops by at least a predetermined extent during a fastening stage of operation the controller 112 can determine that the mandrel of the blind rivet being fastened has snapped and thus that the jaw assembly 500 has been pulled back sufficiently far.
  • the tool 100 is required to perform a reset operation to dispose of the broken mandrel and to accept a fresh blind rivet for setting.
  • the controller 112 causes the motor 114 to reverse its direction for moving the threaded rod 134, and thus the pull-back hull 304, in the other direction along the second longitudinal axis B-B to the left in Figs. 1 and 2 .
  • the spring 314 via the separator sleeve 312 will urge the front ramped surfaces 400 of the jaws 306 against the annular ramped surface 402 of the nose piece 320.
  • the internal path 204 is defined by aligned openings extending through components between the jaws 306 and the collection chamber 200, including a first channel 202 extending through the threaded rod 134 along the second longitudinal axis B-B and a second channel 204 through a guidance sleeve 206.
  • Designers are free to select a suitable way for the controller 112 to control operation of the motor 114 in use to implement a reset operation. In other words designers are free to select a suitable way for the controller 112 to determine when the jaw assembly 500 has returned to the home position at which point in time reverse movement of the jaw assembly 500 is ceased.
  • a mechanical switch may be provided within the tool 100 and in response to the controller 112 determining that the trigger 110 has been released by a user the controller 112 causes the pull-back hull 304 (and thus the jaw assembly 500) to be moved in the reverse direction until a feature of the pull-back hull 304 actuates the mechanical swich thereby generating output indicative that the jaw assembly 500 has returned to the home position.
  • an optical sensor may be provided within the tool 100 which generates output based on the presence or absence of a feature on the pull-back hull 304 wherein based on output from the optical sensor the controller 112 can determine that the pull-back hull 304 (and thus the jaw assembly 500) has reached the home position.
  • a magnet is provided on the pull-back hull 304 and a Hall sensor is provided in a fixed location within the tool, wherein such features can be arranged such that upon the Hall sensor generating a suitable output based on interacting with the magnet on the pull-back hull 304 the controller 112 can determine that the pull-back hull 304 (and thus the jaw assembly 500) has reached the home position.
  • Fig. 3a shows a perspective view of the jaw assembly 500 in a first configuration in which the jaws 306 are located radially as close to each other as possible.
  • Fig. 3b shows a perspective view of the jaw assembly 500 in a second configuration in which the jaws 306 are urged radially apart from each other such as by a mandrel of a blind rivet being inserted through the space between the jaws 306 or the jaws 306 being forced against the annular ramped surface 402 of the nose piece 320.
  • the jaw assembly 500 comprises three identical jaws 306 circumferentially arranged about a jaw assembly axis G-G. When the jaw assembly 500 is mounted in the tool 100, the jaw assembly axis G-G is coaxial with the second longitudinal axis B-B of the tool 100. The three jaws 306 can move radially with respect to the jaw assembly axis G-G.
  • the jaw assembly 500 may be swapped with a new jaw assembly because the jaws 306 of the original jaw assembly have worn. Further alternatively the jaw assembly 500 may be swapped with a new jaw assembly because the different jaw assemblies are configured for use with different sized mandrels.
  • the jaw assembly has a flexible o-ring 502 for holding the jaws 306 of the jaw assembly 500 together when it is not located within the tool 100.
  • Each of the jaws 306 defines part of an annual groove 504 when the jaws 306 are in the configuration shown in Fig. 3a wherein the o-ring 502 is located in the annular groove 504 and biases the jaws 306 together.
  • the o-ring 502 can be made from an elastic material such as rubber.
  • the motor 114 is only partially received within the handle 114.
  • At least one planetary gear stage of the transmission 118 is received in the handle 106.
  • the motor 114 and the transmission 118 are received in the handle 106.
  • the battery 104 is removable from the tool 100 or alternatively the battery 104 is integral to the tool 100.
  • the tool 100 may comprise other power sources e.g. it may be configured to receive power from a mains power supply.
  • the driving sleeve 126 and input sleeve 128 are fixed to each other due to a friction fit arrangement.
  • the driving sleeve 126 and input sleeve 128 can be fixed via an interlocking arrangement such as a spline fit arrangement or other male and female interlocking-type arrangement.
  • the o-ring 502 is seated in a groove 504.
  • the o-ring 502 may be replaced with any suitable means to keep the jaws 306 together such as a c-clip, a circlip, an e clip, a snap ring, or another spring fastener.
  • the o-ring 502 is made from an elastic material such as rubber.
  • the o-ring 502 is optionally made from polyurethane, PTFE, ethylene propylene rubber, neoprene, nitrile, or silicone.
  • the jaw assembly 500 comprises three jaws 306.
  • the jaw assembly 500 can comprise any number of jaws 306 more than two.
  • the jaws 306 do not interlock with each other for maintaining jaw alignment.
  • the tool 100 can be configured to detect the occurrence of a mandrel snapping by monitoring motor speed.
  • the controller 112 can monitor for such a sudden increase in motor speed and in response to detecting such occurrence determine that the mandrel of the rivet being set has snapped and in response cease retracting the jaw assembly 500. Subsequently the controller 112 initiates the reset stage of operation either automatically or in response to release of the trigger 110.
  • the motor 114 has been described as being a brushless motor and the controller 112 cooperates with the brushless motor (in particular with its control electronics) in order to control the brushless motor.
  • the motor 114 may be a brushed motor having a motor output shaft driven by a stator and having at least one magnet on the motor output shaft. It is here mentioned that in battery operated embodiments the motor 114 is configured to operate using DC current, whereas in mains operated embodiments the motor is configured to operate using AC current.
  • the tool 100 may have a roller screw mechanism instead of a ball screw arrangement 300 for transferring rotational motion into linear motion.
  • a roller screw mechanism instead of a ball screw arrangement 300 for transferring rotational motion into linear motion.
  • this can be achieved by rotationally fixing the driving sleeve 126 to an input sleeve of the roller screw mechanism; wherein a set of rollers are provided between the internal surface of the input sleeve and an external surface of the threaded rod 134.
  • the driving sleeve 126 When the driving sleeve 126 is caused to rotate it drives rotation of the input sleeve of the roller screw mechanism and thus via the rollers causes linear movement of the threaded rod 134 and thus the jaw assembly.
  • the heretofore described functionality need not necessarily be used exclusively in blind rivet setting tools but may be used in other power tools having a fastener gripping portion which moves backwards from a home position in order to set a fastener and which is then returned to the home position.
  • the heretofore described functionality can be implemented in other tools such as rivet setting tools (not necessarily blind rivet fastening tools), swage fastener tools and lockbolt fastener tools wherein the fastener gripping portion of such tools is configured to grip the type of fastener which the tool is used to set e.g. the fastener gripping portion of a swage fastener tool is configured to grip a swage fastener.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
EP23151315.1A 2022-02-22 2023-01-12 Outil électrique pour poser des éléments de fixation Pending EP4230326A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB2202371.7A GB202202371D0 (en) 2022-02-22 2022-02-22 Blind rivet Setting tool
GBGB2213921.6A GB202213921D0 (en) 2022-02-22 2022-09-23 Power tool for setting fasteners

Publications (1)

Publication Number Publication Date
EP4230326A1 true EP4230326A1 (fr) 2023-08-23

Family

ID=84819971

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23151315.1A Pending EP4230326A1 (fr) 2022-02-22 2023-01-12 Outil électrique pour poser des éléments de fixation

Country Status (2)

Country Link
US (2) US20230264251A1 (fr)
EP (1) EP4230326A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190247913A1 (en) * 2018-02-13 2019-08-15 Milwaukee Electric Tool Corporation Set of nosepieces for a rivet setting tool
EP3530372A1 (fr) 2016-11-30 2019-08-28 Makita Corporation Outil de fixation
US20190351477A1 (en) * 2017-01-13 2019-11-21 Makita Corporation Fastening tool
JP2021041417A (ja) * 2019-09-06 2021-03-18 株式会社マキタ 締結工具

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3530372A1 (fr) 2016-11-30 2019-08-28 Makita Corporation Outil de fixation
US20190283111A1 (en) * 2016-11-30 2019-09-19 Makita Corporation Fastening tool
US20190351477A1 (en) * 2017-01-13 2019-11-21 Makita Corporation Fastening tool
US20190247913A1 (en) * 2018-02-13 2019-08-15 Milwaukee Electric Tool Corporation Set of nosepieces for a rivet setting tool
JP2021041417A (ja) * 2019-09-06 2021-03-18 株式会社マキタ 締結工具

Also Published As

Publication number Publication date
US20230264251A1 (en) 2023-08-24
US20240001432A1 (en) 2024-01-04

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