WO2009099376A1 - Device for a power screw driver and power screw driver - Google Patents

Device for a power screw driver and power screw driver Download PDF

Info

Publication number
WO2009099376A1
WO2009099376A1 PCT/SE2009/000067 SE2009000067W WO2009099376A1 WO 2009099376 A1 WO2009099376 A1 WO 2009099376A1 SE 2009000067 W SE2009000067 W SE 2009000067W WO 2009099376 A1 WO2009099376 A1 WO 2009099376A1
Authority
WO
WIPO (PCT)
Prior art keywords
screw driver
mouthpiece
ejector assembly
power screw
housing
Prior art date
Application number
PCT/SE2009/000067
Other languages
French (fr)
Inventor
Nabil Khalil Radif
Original Assignee
Atlas Copco Tools Ab
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
Application filed by Atlas Copco Tools Ab filed Critical Atlas Copco Tools Ab
Priority to CN200980104133.0A priority Critical patent/CN101939142B/en
Publication of WO2009099376A1 publication Critical patent/WO2009099376A1/en

Links

Classifications

    • 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
    • B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
    • B25B11/005—Vacuum work holders
    • B25B11/007—Vacuum work holders portable, e.g. handheld
    • 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
    • B25B23/02—Arrangements for handling screws or nuts
    • B25B23/08—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation

Definitions

  • the invention concerns a device according to the preamble of claim 1.
  • the invention also concerns a power screw driver according to the preamble of claim 11.
  • a pneumatic screwing tool which is provided with an arrangement for picking up and holding a screw by suction prior to tightening it .
  • an ejector assembly which is manoeuvrable by means of a push button.
  • a low pressure duct extends between the ejector assembly and a locating and holding sleeve, which provides a locating a driving position for a screw to be tightened by the tool .
  • the tool according to GB 20 68 284 is an expensive and complex solution in that it requires particular machining operations tcPbe carried out in respect of i.e. the tool casing.
  • the tool For actuation of the suction effect, the tool requires manipulation at a rear region which is at a great distance from the screw driving end. That arrangement thus requires manipulation at that rear region during operation of the tool .
  • the invention aims to address the problems of the background art in order to at least partially mitigate the associated draw backs.
  • an inventive ejector unit being an integral unit which has the advantages of being adapted to be adjoined to the casing of a power screw driver.
  • the ejector assembly is thus positioned close to the position where negative pressure is used, whereby losses because of long conduits are avoided.
  • the device can be used as a special module in respect of for example a standard tool having a lower casing part exchanged for the inventive injector unit.
  • the unit includes the mouthpiece as well as the ejector assembly, it is not necessary to subject the tool interior or casing for particular machining operations in order to house these elements .
  • the device When the device includes an actuating control switch for activating/deactivating the device, the consumption of pressurised air and thereby energy can be minimized. Noise during operation can also be reduced.
  • the actuating control switch controls incoming pressurised air to the device in order, in full, to achieve the above advantage, even though throttling of the outgoing, negative pressure is also possible.
  • the device is constructed as at least a part of a handgrip for an operator.
  • the actuating control switch is advantageously positioned so that it can be reached with a finger (or a thumb) or the hand holding the handgrip.
  • the entire power screw driver can thereby be used, controlled and manipulated with only one hand, which is an advantage over the prior art.
  • the mouthpiece is spring loaded in a direction outwardly from the device in a per se known manner .
  • the device is preferably provided with an outlet for pressurised air having passed the ejector assembly.
  • This outlet is preferably provided with a sound absorber, a diffuser or the like.
  • the invention also concerns a power' screw driver which includes a device for creating a negative pressure according to the above.
  • the power screw driver is a pneumatic screw driver, whereby, power feed means in the form of pressurized air for the power screw is advantageously used for operation of the ejector assembly.
  • a normal pressure level can be in the region of (non limiting) 4 - 8 bar.
  • Fig. 1 diagrammatically shows a power screw driver with a device for creating a negative pressure
  • Fig. 2 shows an axial section through the power screw driver in Fig. 1,
  • Fig. 3 shows a device for creating a negative pressure separate from the casing of the power screw driver of fig. 2 in a first section
  • Fig. 4 shows the device of Fig. 3 in another axial section.
  • reference numeral 1 denotes a power screw driver, in particular a power screw driver 1 with a pneumatic rotational motor inside a casing 2.
  • a device 3 for creating a negative pressure having' a housing 3', and forming an- integral unit having a screw-holding mouthpiece 4 at its extreme end 8 , and having, on an opposite side 9, means for connection to the casing 2 over an interface indicated with 7.
  • the device 3 further has an actuation control button 5 for controlling inflow of pressurised air into the device.
  • the actuation control button 5 is shown directed sideways and positioned in an upper position of the device 3, in order to be conveniently manipulated by a finger (or a thumb) of a hand holding the power screw driver.
  • An outlet for pressurised air exiting the device 3 is indicated with 10.
  • the outlet can be supplemented with a noise damper a diffuser etc (not shown) .
  • an axis A - A of the casing 2 is oriented in parallel with an axis B - B of a sideward protruding portion of the device 3.
  • Fig. 2 the power screw driver 1 is shown in axial section, wherein, inside the casing 2, as usual there are arranged a pneumatic motor 11, a transmission 12 and a torque limiting shut-off device 13. These devices are not part of this invention and will therefore not be explained in more detail here.
  • first main bore 28 for an ejector assembly 15, 16, 17, 18 and a second main bore 29 for a screw bit 25 assembly and for connection to the casing 2.
  • These bores are interconnected over a bore 19 forming an angle with the respective axes of said main bores .
  • the ejector assembly includes, in a per se known manner, downstream of a pressurised air inlet 14, the actuation control button 5 being arranged in a connecting part 30. Further downstream thereof in the bore 29 there is positioned a high speed flow nozzle 15 which for example could be a Delaval nozzle or any other more uncomplicated tubular structure.
  • RF ⁇ TIFIFD SHFFT IRIW F 9-M 21 indicates a spring which forces the mouthpiece 4 in the direction out from the housing 3.
  • Figs. 3 and 4 show the device with the housing separated from the casing 2 in different sections.
  • the "used gas" outlet 10 is indicated from the inside of an outlet chamber 26.
  • the connecting portion 27 could have various means for the connection to the casing 2 such as screw thread means or bayonet coupling means. Also other per se known connection arrangements can be envisaged.
  • Fig. 4 is shown the conduit 17 which is described above. Further, the button 5 is shown having a blocking portion 31 blocking the incoming air and a pass portion allowing flow of incoming air.
  • the space 33 is for the reception of a spring (not shown) for urging the button into a blocking state .
  • Adjustment of the negative pressure can be achieved in various ways.
  • One measure is to provide an adjustable inlet air throttle another to arrange a pressure regulator in the pressure conduit (not shown) .
  • the operator activates suction in the mouthpiece by pressing the button for the creation of negative pressure, picks up a screw from for example a sorting table, presses the tool with the screw in the mouthpiece seat against the intended position whereupon the mouthpiece is pressed into the housing and the motor is activated in connection with engagement of the bit with the screw.
  • the invention can be modified within the scope of the claims. It is not excluded that the unit is in one piece with the casing even if this is not preferred.
  • the solution with the actuating button positioned within reach of the hand gripping the tool is highly preferred, but it is not excluded to provide for other solutions.
  • a common pressurized air conduit supplies the device as well as the driver motor but other solutions are also possible such as for example different level supplies for the separate consumers.
  • the device is intended for all sizes of screws even if it most likely to be used for drivers for screws of dimension raging from M2 - M5.
  • the housing is preferably made from aluminium or an alloy thereof. It is not excluded that other metals or even synthetic materials can be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Jet Pumps And Other Pumps (AREA)

Abstract

A device (3) for creating a negative pressure inside a screw holding mouthpiece (4) of a power screw driver (1), including an ejector assembly (15, 16, 17, 18) having a negative pressure chamber (16) which is arranged to be connected to the mouthpiece (4). The device (3) is comprised of an integral unit which includes the ejector assembly (15, 16, 17, 18) and, on an extreme end side (8), is provided with the mouthpiece (4), and is adapted to adjoin to a casing (2) of said power screw driver (1). The invention also concerns a power screw driver.

Description

DRVTrF, FOR A POWFiT? RCRBW DRIVER AND POWER SCT?EiW DKTVER.
FIELD OF THE INVENTION
The invention concerns a device according to the preamble of claim 1. The invention also concerns a power screw driver according to the preamble of claim 11.
BACKGROUND OF THE INVENTION
From GB 20 68 284 is previously known a pneumatic screwing tool which is provided with an arrangement for picking up and holding a screw by suction prior to tightening it . In a rear region of the screwing tool housing, there is arranged an ejector assembly which is manoeuvrable by means of a push button. A low pressure duct extends between the ejector assembly and a locating and holding sleeve, which provides a locating a driving position for a screw to be tightened by the tool .
The tool according to GB 20 68 284 is an expensive and complex solution in that it requires particular machining operations tcPbe carried out in respect of i.e. the tool casing. For actuation of the suction effect, the tool requires manipulation at a rear region which is at a great distance from the screw driving end. That arrangement thus requires manipulation at that rear region during operation of the tool .
AIM AND MOST IMPORTANT FEATURES OF THE INVENTION
The invention aims to address the problems of the background art in order to at least partially mitigate the associated draw backs.
This aim is achieved through the features of claim 1. Hereby is provided an inventive ejector unit being an integral unit which has the advantages of being adapted to be adjoined to the casing of a power screw driver. The ejector assembly is thus positioned close to the position where negative pressure is used, whereby losses because of long conduits are avoided.
When said integral unit has a housing, which is provided with a connecting portion for the connection to said casing, the device can be used as a special module in respect of for example a standard tool having a lower casing part exchanged for the inventive injector unit.
Since the unit includes the mouthpiece as well as the ejector assembly, it is not necessary to subject the tool interior or casing for particular machining operations in order to house these elements .
When the device includes an actuating control switch for activating/deactivating the device, the consumption of pressurised air and thereby energy can be minimized. Noise during operation can also be reduced.
It is preferred that the actuating control switch controls incoming pressurised air to the device in order, in full, to achieve the above advantage, even though throttling of the outgoing, negative pressure is also possible.
It is preferred that the device is constructed as at least a part of a handgrip for an operator. Thereby the actuating control switch is advantageously positioned so that it can be reached with a finger (or a thumb) or the hand holding the handgrip. The entire power screw driver can thereby be used, controlled and manipulated with only one hand, which is an advantage over the prior art. It is preferred that the mouthpiece is spring loaded in a direction outwardly from the device in a per se known manner .
When the axis of a bore for the ejector assembly inside the housing is longitudinal and extends essentially in parallel with an axis of the power screw driver (and the mouthpiece) (in a connected state) it is possible to achieve a slim construction without unnecessarily protruding elements.
The device is preferably provided with an outlet for pressurised air having passed the ejector assembly. This outlet is preferably provided with a sound absorber, a diffuser or the like.
The invention also concerns a power' screw driver which includes a device for creating a negative pressure according to the above. It is preferred that the power screw driver is a pneumatic screw driver, whereby, power feed means in the form of pressurized air for the power screw is advantageously used for operation of the ejector assembly. A normal pressure level can be in the region of (non limiting) 4 - 8 bar.
Further features and advantages of the invention will be explained in the detailed description below.
BRIEF DESCRIPTION OF DRAWINGS
The invention will now be described in greater detail at the background of an embodiment and with reference to the annexed drawings, wherein:
Fig. 1 diagrammatically shows a power screw driver with a device for creating a negative pressure, Fig. 2 shows an axial section through the power screw driver in Fig. 1,
Fig. 3 shows a device for creating a negative pressure separate from the casing of the power screw driver of fig. 2 in a first section, and
Fig. 4 shows the device of Fig. 3 in another axial section.
DESCRIPTION OF AN EMBODIMENT
In Fig. 1 reference numeral 1 denotes a power screw driver, in particular a power screw driver 1 with a pneumatic rotational motor inside a casing 2. Onto the casing 2 is connected a device 3 for creating a negative pressure, having' a housing 3', and forming an- integral unit having a screw-holding mouthpiece 4 at its extreme end 8 , and having, on an opposite side 9, means for connection to the casing 2 over an interface indicated with 7.
The device 3 further has an actuation control button 5 for controlling inflow of pressurised air into the device. The actuation control button 5 is shown directed sideways and positioned in an upper position of the device 3, in order to be conveniently manipulated by a finger (or a thumb) of a hand holding the power screw driver.
An outlet for pressurised air exiting the device 3 is indicated with 10. The outlet can be supplemented with a noise damper a diffuser etc (not shown) .
In the shown embodiment, an axis A - A of the casing 2 is oriented in parallel with an axis B - B of a sideward protruding portion of the device 3.
In Fig. 2 the power screw driver 1 is shown in axial section, wherein, inside the casing 2, as usual there are arranged a pneumatic motor 11, a transmission 12 and a torque limiting shut-off device 13. These devices are not part of this invention and will therefore not be explained in more detail here.
Inside the housing 3' there is arranged a first main bore 28 for an ejector assembly 15, 16, 17, 18 and a second main bore 29 for a screw bit 25 assembly and for connection to the casing 2. These bores are interconnected over a bore 19 forming an angle with the respective axes of said main bores .
The ejector assembly includes, in a per se known manner, downstream of a pressurised air inlet 14, the actuation control button 5 being arranged in a connecting part 30. Further downstream thereof in the bore 29 there is positioned a high speed flow nozzle 15 which for example could be a Delaval nozzle or any other more uncomplicated tubular structure.
16 indicates a negative pressure chamber wherein, as is per se previously known, a negative pressure will be created as a result of a gas flow through the nozzle 15.
23 indicates an outlet pipe member for used pressurised air having fulfilled the ejector action.
17 indicates a channel between the negative pressure, chamber 16 and an end chamber 18 which over the bore 19 communicates with a suction chamber 20 which in turn extends into the interior of the mouthpiece 4.
24 indicates an annular seat for a screw to be held by the mouthpiece 4 in operation of the device .
RFΠTIFIFD SHFFT IRIW F 9-M 21 indicates a spring which forces the mouthpiece 4 in the direction out from the housing 3.
22 indicates a sealing ring which seals off the suction chamber 20 from the upper portion of the housing 3 and from the inside of the power screw driver.
Figs. 3 and 4 show the device with the housing separated from the casing 2 in different sections. In Fig. 3 the "used gas" outlet 10 is indicated from the inside of an outlet chamber 26.
The connecting portion 27 could have various means for the connection to the casing 2 such as screw thread means or bayonet coupling means. Also other per se known connection arrangements can be envisaged.
In Fig. 4 is shown the conduit 17 which is described above. Further, the button 5 is shown having a blocking portion 31 blocking the incoming air and a pass portion allowing flow of incoming air. The space 33 is for the reception of a spring (not shown) for urging the button into a blocking state .
Adjustment of the negative pressure can be achieved in various ways. One measure is to provide an adjustable inlet air throttle another to arrange a pressure regulator in the pressure conduit (not shown) .
In operation of the device, the operator activates suction in the mouthpiece by pressing the button for the creation of negative pressure, picks up a screw from for example a sorting table, presses the tool with the screw in the mouthpiece seat against the intended position whereupon the mouthpiece is pressed into the housing and the motor is activated in connection with engagement of the bit with the screw.
The invention can be modified within the scope of the claims. It is not excluded that the unit is in one piece with the casing even if this is not preferred. The solution with the actuating button positioned within reach of the hand gripping the tool is highly preferred, but it is not excluded to provide for other solutions.
It is preferred that a common pressurized air conduit supplies the device as well as the driver motor but other solutions are also possible such as for example different level supplies for the separate consumers.
The device is intended for all sizes of screws even if it most likely to be used for drivers for screws of dimension raging from M2 - M5.
The housing is preferably made from aluminium or an alloy thereof. It is not excluded that other metals or even synthetic materials can be used.

Claims

Cla ims
1- Device (3) for creating a negative pressure inside a screw holding mouthpiece (4) of a power screw driver (1) , including an ejector assembly (15, 16, 17, 18) having a negative pressure chamber (16) which is arranged to be connected to the mouthpiece (4) , characterized in
- that the device (3) comprises an integral unit which includes the ejector assembly (15, 16, 17, 18) and, on an extreme end side (8) , is provided with the mouthpiece (4) , and
- that said integral unit on a side (9) opposite to said extreme end side (8) is adapted to adjoin to a casing (2) of said power screw driver (1) .
2. Device according to claim 1, characterized in
- that said integral unit comprises a housing (3 ^) which is provided with a connecting portion (26) for the connection to said casing (2) .
3. Device according to claim 1 or 2, characterized in
- that it includes an actuation control switch (5) for activating/deactivating the device.
4. Device according to claim 3 , characterized in
- that the actuation control switch (5) is manoeuvred by a device that is one from the group: a control button, a control knob, a control handle, a control wheel.
5. Device according to claim 3 or 4, characterized in
- that the housing (3") forms at least a part of a handgrip for an operator.
6. Device according to claim 5, characterized in
- that the actuation control switch (5) is positioned so as to be within reach for a finger of a hand holding the handgrip .
7. Device according to any one of the previous claims, characterized in
- that the mouthpiece (4) is axially displaceable guided relative to, and spring loaded (21) in a direction outwardly from said housing (3 ' ) .
8. Device according to any one of the previous claims when dependent on claim 2, characterized in
- that the housing (3") is provided with a bore (28) for the ejector assembly (15, 16, 17, 18) having a longitudinal extension with an axis (B-B) extending essentially in parallel with an axis (A-A) of the mouthpiece (4) and of the screw driver (1) in a connected state.
9. Device according to any one of the previous claims when dependent on claim 2 , characterized in
- that the housing (3') is provided with a suction chamber (20) , which in an assembled state surrounds a screw bit
(25) and which debouches into the mouthpiece (4) , said suction chamber (20) being connected to the ejector assembly (15, 16, 17, 18) over a bore (19) forming an angle with an axis (A-A) of the mouthpiece (4) and of the screw driver (1) in a connected state.
10. Device according to any one of the previous claims, characterized in
- that it is provided with an outlet (10) for pressurized air having passed the ejector assembly (15, 16, 17, 18) .
11. Power screw driver (1) for tightening of screws, including a rotational motor (11) inside a casing (2) , characterized in
- that it includes a device (3) according to any one of claims 1 - 10.
12. Power screw driver (1) according to claim 11, characterized in
- that it is one from the group: a pneumatic screw driver, an electric screw driver.
13. Power screw driver (1) according to claim 12, wherein it is a pneumatic screw driver, characterized in
- that it includes common means (6) for supplying pressurized air to the ejector assembly (15, 16, 17, 18) and to the rotational motor (11) .
PCT/SE2009/000067 2008-02-06 2009-02-04 Device for a power screw driver and power screw driver WO2009099376A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN200980104133.0A CN101939142B (en) 2008-02-06 2009-02-04 Device for a power screw driver and power screw driver

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0800278-4 2008-02-06
SE0800278A SE532118C2 (en) 2008-02-06 2008-02-06 Device for a screwdriver and screwdriver

Publications (1)

Publication Number Publication Date
WO2009099376A1 true WO2009099376A1 (en) 2009-08-13

Family

ID=40952349

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2009/000067 WO2009099376A1 (en) 2008-02-06 2009-02-04 Device for a power screw driver and power screw driver

Country Status (3)

Country Link
CN (1) CN101939142B (en)
SE (1) SE532118C2 (en)
WO (1) WO2009099376A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011002010B4 (en) * 2010-04-19 2014-03-27 Ohtake Root Kogyo Co., Ltd. Automatic screw tightening device
WO2015069166A1 (en) * 2013-11-08 2015-05-14 Atlas Copco Industrial Technique Ab Vacuum adapter for a power tool
KR20170087477A (en) * 2014-12-11 2017-07-28 아틀라스 콥코 인더스트리얼 테크니크 에이비 Screw driver with vacuum screw pick-up feature

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210025618A (en) * 2018-06-29 2021-03-09 아틀라스 콥코 인더스트리얼 테크니크 에이비 Power screwdriver
JP7391628B2 (en) * 2019-11-22 2023-12-05 ファナック株式会社 nut runner device

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GB1339657A (en) * 1971-11-05 1973-12-05 Desoutter Brothers Ltd Pneumatic screwdriver or like rotary tool
SU1127760A1 (en) * 1983-02-09 1984-12-07 Рижское Производственное Объединение Вэф Им.В.И.Ленина Screw driver tool with vacuum gripper
JPH10156741A (en) * 1996-12-04 1998-06-16 Kato Seiki Kk Screw sucking and holding device of power driver
JP2000158354A (en) * 1998-11-20 2000-06-13 Katsuro Sawamura Machine screw automatic mounting device for screwdriver
JP2002046075A (en) * 2000-08-01 2002-02-12 Sumitomo Metal Steel Products Inc Chip suction device for electric driver

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DE4305967C2 (en) * 1993-02-26 1997-03-06 Kress Elektrik Gmbh & Co Switch device for spindle locking for power tools
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GB1339657A (en) * 1971-11-05 1973-12-05 Desoutter Brothers Ltd Pneumatic screwdriver or like rotary tool
SU1127760A1 (en) * 1983-02-09 1984-12-07 Рижское Производственное Объединение Вэф Им.В.И.Ленина Screw driver tool with vacuum gripper
JPH10156741A (en) * 1996-12-04 1998-06-16 Kato Seiki Kk Screw sucking and holding device of power driver
JP2000158354A (en) * 1998-11-20 2000-06-13 Katsuro Sawamura Machine screw automatic mounting device for screwdriver
JP2002046075A (en) * 2000-08-01 2002-02-12 Sumitomo Metal Steel Products Inc Chip suction device for electric driver

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011002010B4 (en) * 2010-04-19 2014-03-27 Ohtake Root Kogyo Co., Ltd. Automatic screw tightening device
WO2015069166A1 (en) * 2013-11-08 2015-05-14 Atlas Copco Industrial Technique Ab Vacuum adapter for a power tool
EP3077158A4 (en) * 2013-11-08 2017-09-27 Atlas Copco Industrial Technique AB Vacuum adapter for a power tool
US10105829B2 (en) 2013-11-08 2018-10-23 Atlas Copco Industrial Technique Ab Vacuum adapter for a power tool
KR20170087477A (en) * 2014-12-11 2017-07-28 아틀라스 콥코 인더스트리얼 테크니크 에이비 Screw driver with vacuum screw pick-up feature
KR102437924B1 (en) * 2014-12-11 2022-08-29 아틀라스 콥코 인더스트리얼 테크니크 에이비 Screw driver with vacuum screw pick-up feature

Also Published As

Publication number Publication date
CN101939142B (en) 2013-06-05
CN101939142A (en) 2011-01-05
SE0800278L (en) 2009-08-07
SE532118C2 (en) 2009-10-27

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